sql_parse.cc 243 KB
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/* Copyright 2000-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc.
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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; version 2 of the License.
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

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#define MYSQL_LEX 1
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#include "my_global.h"
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#include "sql_priv.h"
#include "unireg.h"                    // REQUIRED: for other includes
#include "sql_parse.h"        // sql_kill, *_precheck, *_prepare
#include "lock.h"             // wait_if_global_read_lock,
                              // unlock_global_read_lock,
                              // try_transactional_lock,
                              // check_transactional_lock,
                              // set_handler_table_locks,
                              // start_waiting_global_read_lock,
                              // lock_global_read_lock,
                              // make_global_read_lock_block_commit
#include "sql_base.h"         // find_temporary_tablesx
#include "sql_cache.h"        // QUERY_CACHE_FLAGS_SIZE, query_cache_*
#include "sql_show.h"         // mysqld_list_*, mysqld_show_*,
                              // calc_sum_of_all_status
#include "mysqld.h"
#include "sql_locale.h"                         // my_locale_en_US
#include "log.h"                                // flush_error_log
#include "sql_view.h"         // mysql_create_view, mysql_drop_view
#include "sql_delete.h"       // mysql_truncate, mysql_delete
#include "sql_insert.h"       // mysql_insert
#include "sql_update.h"       // mysql_update, mysql_multi_update
#include "sql_partition.h"    // struct partition_info
#include "sql_db.h"           // mysql_change_db, mysql_create_db,
                              // mysql_rm_db, mysql_upgrade_db,
                              // mysql_alter_db,
                              // check_db_dir_existence,
                              // my_dbopt_cleanup
#include "sql_table.h"        // mysql_create_like_table,
                              // mysql_create_table,
                              // mysql_alter_table,
                              // mysql_recreate_table,
                              // mysql_backup_table,
                              // mysql_restore_table
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#include "sql_truncate.h"     // mysql_truncate_table
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#include "sql_connect.h"      // check_user,
                              // decrease_user_connections,
                              // thd_init_client_charset, check_mqh,
                              // reset_mqh
#include "sql_rename.h"       // mysql_rename_table
#include "sql_tablespace.h"   // mysql_alter_tablespace
#include "hostname.h"         // hostname_cache_refresh
#include "sql_acl.h"          // *_ACL, check_grant, is_acl_user,
                              // has_any_table_level_privileges,
                              // mysql_drop_user, mysql_rename_user,
                              // check_grant_routine,
                              // mysql_routine_grant,
                              // mysql_show_grants,
                              // sp_grant_privileges, ...
#include "sql_test.h"         // mysql_print_status
#include "sql_select.h"       // handle_select, mysql_select,
                              // mysql_explain_union
#include "sql_load.h"         // mysql_load
#include "sql_servers.h"      // create_servers, alter_servers,
                              // drop_servers, servers_reload
#include "sql_handler.h"      // mysql_ha_open, mysql_ha_close,
                              // mysql_ha_read
#include "sql_binlog.h"       // mysql_client_binlog_statement
#include "sql_do.h"           // mysql_do
#include "sql_help.h"         // mysqld_help
#include "rpl_constants.h"    // Incident, INCIDENT_LOST_EVENTS
#include "log_event.h"
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#include "sql_repl.h"
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#include "rpl_filter.h"
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#include "repl_failsafe.h"
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#include <m_ctype.h>
#include <myisam.h>
#include <my_dir.h>
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#include "rpl_handler.h"
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#include "sp_head.h"
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#include "sp.h"
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#include "sp_cache.h"
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#include "events.h"
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#include "sql_trigger.h"
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#include "transaction.h"
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#include "sql_audit.h"
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#include "sql_prepare.h"
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#include "debug_sync.h"
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#include "probes_mysql.h"
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#include "set_var.h"
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#define FLAGSTR(V,F) ((V)&(F)?#F" ":"")

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/**
  @defgroup Runtime_Environment Runtime Environment
  @{
*/

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/* Used in error handling only */
#define SP_TYPE_STRING(LP) \
  ((LP)->sphead->m_type == TYPE_ENUM_FUNCTION ? "FUNCTION" : "PROCEDURE")
#define SP_COM_STRING(LP) \
  ((LP)->sql_command == SQLCOM_CREATE_SPFUNCTION || \
   (LP)->sql_command == SQLCOM_ALTER_FUNCTION || \
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   (LP)->sql_command == SQLCOM_SHOW_CREATE_FUNC || \
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   (LP)->sql_command == SQLCOM_DROP_FUNCTION ? \
   "FUNCTION" : "PROCEDURE")

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static bool execute_sqlcom_select(THD *thd, TABLE_LIST *all_tables);
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const char *any_db="*any*";	// Special symbol for check_access
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const LEX_STRING command_name[]={
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  { C_STRING_WITH_LEN("Sleep") },
  { C_STRING_WITH_LEN("Quit") },
  { C_STRING_WITH_LEN("Init DB") },
  { C_STRING_WITH_LEN("Query") },
  { C_STRING_WITH_LEN("Field List") },
  { C_STRING_WITH_LEN("Create DB") },
  { C_STRING_WITH_LEN("Drop DB") },
  { C_STRING_WITH_LEN("Refresh") },
  { C_STRING_WITH_LEN("Shutdown") },
  { C_STRING_WITH_LEN("Statistics") },
  { C_STRING_WITH_LEN("Processlist") },
  { C_STRING_WITH_LEN("Connect") },
  { C_STRING_WITH_LEN("Kill") },
  { C_STRING_WITH_LEN("Debug") },
  { C_STRING_WITH_LEN("Ping") },
  { C_STRING_WITH_LEN("Time") },
  { C_STRING_WITH_LEN("Delayed insert") },
  { C_STRING_WITH_LEN("Change user") },
  { C_STRING_WITH_LEN("Binlog Dump") },
  { C_STRING_WITH_LEN("Table Dump") },
  { C_STRING_WITH_LEN("Connect Out") },
  { C_STRING_WITH_LEN("Register Slave") },
  { C_STRING_WITH_LEN("Prepare") },
  { C_STRING_WITH_LEN("Execute") },
  { C_STRING_WITH_LEN("Long Data") },
  { C_STRING_WITH_LEN("Close stmt") },
  { C_STRING_WITH_LEN("Reset stmt") },
  { C_STRING_WITH_LEN("Set option") },
  { C_STRING_WITH_LEN("Fetch") },
  { C_STRING_WITH_LEN("Daemon") },
  { C_STRING_WITH_LEN("Error") }  // Last command number
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};

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const char *xa_state_names[]={
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  "NON-EXISTING", "ACTIVE", "IDLE", "PREPARED", "ROLLBACK ONLY"
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};

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#ifdef HAVE_REPLICATION
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/**
  Returns true if all tables should be ignored.
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*/
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inline bool all_tables_not_ok(THD *thd, TABLE_LIST *tables)
{
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  return rpl_filter->is_on() && tables && !thd->spcont &&
         !rpl_filter->tables_ok(thd->db, tables);
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}
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#endif
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static bool some_non_temp_table_to_be_updated(THD *thd, TABLE_LIST *tables)
{
  for (TABLE_LIST *table= tables; table; table= table->next_global)
  {
    DBUG_ASSERT(table->db && table->table_name);
    if (table->updating &&
        !find_temporary_table(thd, table->db, table->table_name))
      return 1;
  }
  return 0;
}

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/*
  Implicitly commit a active transaction if statement requires so.

  @param thd    Thread handle.
  @param mask   Bitmask used for the SQL command match.

*/
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static bool stmt_causes_implicit_commit(THD *thd, uint mask)
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{
  LEX *lex= thd->lex;
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  bool skip= FALSE;
  DBUG_ENTER("stmt_causes_implicit_commit");
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  if (!(sql_command_flags[lex->sql_command] & mask))
    DBUG_RETURN(FALSE);

  switch (lex->sql_command) {
  case SQLCOM_DROP_TABLE:
    skip= lex->drop_temporary;
    break;
  case SQLCOM_ALTER_TABLE:
  case SQLCOM_CREATE_TABLE:
    /* If CREATE TABLE of non-temporary table, do implicit commit */
    skip= (lex->create_info.options & HA_LEX_CREATE_TMP_TABLE);
    break;
  case SQLCOM_SET_OPTION:
    skip= lex->autocommit ? FALSE : TRUE;
    break;
  default:
    break;
  }

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  DBUG_RETURN(!skip);
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}


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/**
  Mark all commands that somehow changes a table.

  This is used to check number of updates / hour.
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  sql_command is actually set to SQLCOM_END sometimes
  so we need the +1 to include it in the array.
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  See COMMAND_FLAG_xxx for different type of commands
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     2  - query that returns meaningful ROW_COUNT() -
          a number of modified rows
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*/

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uint sql_command_flags[SQLCOM_END+1];
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uint server_command_flags[COM_END+1];
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void init_update_queries(void)
{
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  /* Initialize the server command flags array. */
  memset(server_command_flags, 0, sizeof(server_command_flags));

  server_command_flags[COM_STATISTICS]= CF_SKIP_QUERY_ID | CF_SKIP_QUESTIONS;
  server_command_flags[COM_PING]=       CF_SKIP_QUERY_ID | CF_SKIP_QUESTIONS;
  server_command_flags[COM_STMT_PREPARE]= CF_SKIP_QUESTIONS;
  server_command_flags[COM_STMT_CLOSE]=   CF_SKIP_QUESTIONS;
  server_command_flags[COM_STMT_RESET]=   CF_SKIP_QUESTIONS;

  /* Initialize the sql command flags array. */
  memset(sql_command_flags, 0, sizeof(sql_command_flags));

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  /*
    In general, DDL statements do not generate row events and do not go
    through a cache before being written to the binary log. However, the
    CREATE TABLE...SELECT is an exception because it may generate row
    events. For that reason,  the SQLCOM_CREATE_TABLE  which represents
    a CREATE TABLE, including the CREATE TABLE...SELECT, has the
    CF_CAN_GENERATE_ROW_EVENTS flag. The distinction between a regular
    CREATE TABLE and the CREATE TABLE...SELECT is made in other parts of
    the code, in particular in the Query_log_event's constructor.
  */
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  sql_command_flags[SQLCOM_CREATE_TABLE]=   CF_CHANGES_DATA | CF_REEXECUTION_FRAGILE |
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                                            CF_AUTO_COMMIT_TRANS | CF_PROTECT_AGAINST_GRL |
                                            CF_CAN_GENERATE_ROW_EVENTS;
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  sql_command_flags[SQLCOM_CREATE_INDEX]=   CF_CHANGES_DATA | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_ALTER_TABLE]=    CF_CHANGES_DATA | CF_WRITE_LOGS_COMMAND |
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                                            CF_AUTO_COMMIT_TRANS | CF_PROTECT_AGAINST_GRL;
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  sql_command_flags[SQLCOM_TRUNCATE]=       CF_CHANGES_DATA | CF_WRITE_LOGS_COMMAND |
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                                            CF_AUTO_COMMIT_TRANS | CF_PROTECT_AGAINST_GRL;
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  sql_command_flags[SQLCOM_DROP_TABLE]=     CF_CHANGES_DATA | CF_AUTO_COMMIT_TRANS;
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  sql_command_flags[SQLCOM_LOAD]=           CF_CHANGES_DATA | CF_REEXECUTION_FRAGILE |
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                                            CF_PROTECT_AGAINST_GRL |
                                            CF_CAN_GENERATE_ROW_EVENTS;
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  sql_command_flags[SQLCOM_CREATE_DB]=      CF_CHANGES_DATA | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_DROP_DB]=        CF_CHANGES_DATA | CF_AUTO_COMMIT_TRANS;
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  sql_command_flags[SQLCOM_ALTER_DB_UPGRADE]= CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_ALTER_DB]=       CF_CHANGES_DATA | CF_AUTO_COMMIT_TRANS;
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  sql_command_flags[SQLCOM_RENAME_TABLE]=   CF_CHANGES_DATA | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_DROP_INDEX]=     CF_CHANGES_DATA | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_CREATE_VIEW]=    CF_CHANGES_DATA | CF_REEXECUTION_FRAGILE |
                                            CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_DROP_VIEW]=      CF_CHANGES_DATA | CF_AUTO_COMMIT_TRANS;
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  sql_command_flags[SQLCOM_CREATE_TRIGGER]= CF_CHANGES_DATA | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_DROP_TRIGGER]=   CF_CHANGES_DATA | CF_AUTO_COMMIT_TRANS;
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  sql_command_flags[SQLCOM_CREATE_EVENT]=   CF_CHANGES_DATA | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_ALTER_EVENT]=    CF_CHANGES_DATA | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_DROP_EVENT]=     CF_CHANGES_DATA | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_CREATE_TRIGGER]= CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_DROP_TRIGGER]=   CF_AUTO_COMMIT_TRANS;
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  sql_command_flags[SQLCOM_UPDATE]=	    CF_CHANGES_DATA | CF_REEXECUTION_FRAGILE |
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                                            CF_PROTECT_AGAINST_GRL |
                                            CF_CAN_GENERATE_ROW_EVENTS;
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  sql_command_flags[SQLCOM_UPDATE_MULTI]=   CF_CHANGES_DATA | CF_REEXECUTION_FRAGILE |
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                                            CF_PROTECT_AGAINST_GRL |
                                            CF_CAN_GENERATE_ROW_EVENTS;
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  sql_command_flags[SQLCOM_INSERT]=	    CF_CHANGES_DATA | CF_REEXECUTION_FRAGILE |
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                                            CF_PROTECT_AGAINST_GRL |
                                            CF_CAN_GENERATE_ROW_EVENTS;
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  sql_command_flags[SQLCOM_INSERT_SELECT]=  CF_CHANGES_DATA | CF_REEXECUTION_FRAGILE |
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                                            CF_PROTECT_AGAINST_GRL |
                                            CF_CAN_GENERATE_ROW_EVENTS;
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  sql_command_flags[SQLCOM_DELETE]=         CF_CHANGES_DATA | CF_REEXECUTION_FRAGILE |
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                                            CF_PROTECT_AGAINST_GRL |
                                            CF_CAN_GENERATE_ROW_EVENTS;
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  sql_command_flags[SQLCOM_DELETE_MULTI]=   CF_CHANGES_DATA | CF_REEXECUTION_FRAGILE |
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                                            CF_PROTECT_AGAINST_GRL |
                                            CF_CAN_GENERATE_ROW_EVENTS;
  sql_command_flags[SQLCOM_REPLACE]=        CF_CHANGES_DATA | CF_REEXECUTION_FRAGILE |
                                            CF_CAN_GENERATE_ROW_EVENTS;
  sql_command_flags[SQLCOM_REPLACE_SELECT]= CF_CHANGES_DATA | CF_REEXECUTION_FRAGILE |
                                            CF_CAN_GENERATE_ROW_EVENTS;
  sql_command_flags[SQLCOM_SELECT]=         CF_REEXECUTION_FRAGILE |
                                            CF_CAN_GENERATE_ROW_EVENTS;
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  sql_command_flags[SQLCOM_SET_OPTION]=     CF_REEXECUTION_FRAGILE | CF_AUTO_COMMIT_TRANS;
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  sql_command_flags[SQLCOM_DO]=             CF_REEXECUTION_FRAGILE |
                                            CF_CAN_GENERATE_ROW_EVENTS;
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  sql_command_flags[SQLCOM_SHOW_STATUS_PROC]= CF_STATUS_COMMAND | CF_REEXECUTION_FRAGILE;
  sql_command_flags[SQLCOM_SHOW_STATUS]=      CF_STATUS_COMMAND | CF_REEXECUTION_FRAGILE;
  sql_command_flags[SQLCOM_SHOW_DATABASES]=   CF_STATUS_COMMAND | CF_REEXECUTION_FRAGILE;
  sql_command_flags[SQLCOM_SHOW_TRIGGERS]=    CF_STATUS_COMMAND | CF_REEXECUTION_FRAGILE;
  sql_command_flags[SQLCOM_SHOW_EVENTS]=      CF_STATUS_COMMAND | CF_REEXECUTION_FRAGILE;
  sql_command_flags[SQLCOM_SHOW_OPEN_TABLES]= CF_STATUS_COMMAND | CF_REEXECUTION_FRAGILE;
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  sql_command_flags[SQLCOM_SHOW_PLUGINS]=     CF_STATUS_COMMAND;
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  sql_command_flags[SQLCOM_SHOW_FIELDS]=      CF_STATUS_COMMAND | CF_REEXECUTION_FRAGILE;
  sql_command_flags[SQLCOM_SHOW_KEYS]=        CF_STATUS_COMMAND | CF_REEXECUTION_FRAGILE;
  sql_command_flags[SQLCOM_SHOW_VARIABLES]=   CF_STATUS_COMMAND | CF_REEXECUTION_FRAGILE;
  sql_command_flags[SQLCOM_SHOW_CHARSETS]=    CF_STATUS_COMMAND | CF_REEXECUTION_FRAGILE;
  sql_command_flags[SQLCOM_SHOW_COLLATIONS]=  CF_STATUS_COMMAND | CF_REEXECUTION_FRAGILE;
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  sql_command_flags[SQLCOM_SHOW_NEW_MASTER]=  CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_BINLOGS]=     CF_STATUS_COMMAND;
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  sql_command_flags[SQLCOM_SHOW_SLAVE_HOSTS]= CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_BINLOG_EVENTS]= CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_STORAGE_ENGINES]= CF_STATUS_COMMAND;
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  sql_command_flags[SQLCOM_SHOW_AUTHORS]=     CF_STATUS_COMMAND;
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  sql_command_flags[SQLCOM_SHOW_CONTRIBUTORS]= CF_STATUS_COMMAND;
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  sql_command_flags[SQLCOM_SHOW_PRIVILEGES]=  CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_WARNS]=       CF_STATUS_COMMAND | CF_DIAGNOSTIC_STMT;
  sql_command_flags[SQLCOM_SHOW_ERRORS]=      CF_STATUS_COMMAND | CF_DIAGNOSTIC_STMT;
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  sql_command_flags[SQLCOM_SHOW_ENGINE_STATUS]= CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_ENGINE_MUTEX]= CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_ENGINE_LOGS]= CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_PROCESSLIST]= CF_STATUS_COMMAND;
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  sql_command_flags[SQLCOM_SHOW_GRANTS]=      CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_CREATE_DB]=   CF_STATUS_COMMAND;
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  sql_command_flags[SQLCOM_SHOW_CREATE]=  CF_STATUS_COMMAND;
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  sql_command_flags[SQLCOM_SHOW_MASTER_STAT]= CF_STATUS_COMMAND;
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  sql_command_flags[SQLCOM_SHOW_SLAVE_STAT]=  CF_STATUS_COMMAND;
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  sql_command_flags[SQLCOM_SHOW_CREATE_PROC]= CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_CREATE_FUNC]= CF_STATUS_COMMAND;
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  sql_command_flags[SQLCOM_SHOW_CREATE_TRIGGER]=  CF_STATUS_COMMAND;
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  sql_command_flags[SQLCOM_SHOW_STATUS_FUNC]= CF_STATUS_COMMAND | CF_REEXECUTION_FRAGILE;
  sql_command_flags[SQLCOM_SHOW_PROC_CODE]=   CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_FUNC_CODE]=   CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_CREATE_EVENT]= CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_PROFILES]=    CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_PROFILE]=     CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_BINLOG_BASE64_EVENT]= CF_STATUS_COMMAND;
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   sql_command_flags[SQLCOM_SHOW_TABLES]=       (CF_STATUS_COMMAND |
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                                                 CF_SHOW_TABLE_COMMAND |
                                                 CF_REEXECUTION_FRAGILE);
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  sql_command_flags[SQLCOM_SHOW_TABLE_STATUS]= (CF_STATUS_COMMAND |
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                                                CF_SHOW_TABLE_COMMAND |
                                                CF_REEXECUTION_FRAGILE);
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  sql_command_flags[SQLCOM_CREATE_USER]=       CF_CHANGES_DATA | CF_PROTECT_AGAINST_GRL;
  sql_command_flags[SQLCOM_RENAME_USER]=       CF_CHANGES_DATA | CF_PROTECT_AGAINST_GRL;
  sql_command_flags[SQLCOM_DROP_USER]=         CF_CHANGES_DATA | CF_PROTECT_AGAINST_GRL;
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  sql_command_flags[SQLCOM_GRANT]=             CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_REVOKE]=            CF_CHANGES_DATA;
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  sql_command_flags[SQLCOM_REVOKE_ALL]=        CF_PROTECT_AGAINST_GRL;
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  sql_command_flags[SQLCOM_OPTIMIZE]=          CF_CHANGES_DATA;
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  sql_command_flags[SQLCOM_CREATE_FUNCTION]=   CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_CREATE_PROCEDURE]=  CF_CHANGES_DATA | CF_PROTECT_AGAINST_GRL | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_CREATE_SPFUNCTION]= CF_CHANGES_DATA | CF_PROTECT_AGAINST_GRL | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_DROP_PROCEDURE]=    CF_CHANGES_DATA | CF_PROTECT_AGAINST_GRL | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_DROP_FUNCTION]=     CF_CHANGES_DATA | CF_PROTECT_AGAINST_GRL | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_ALTER_PROCEDURE]=   CF_CHANGES_DATA | CF_PROTECT_AGAINST_GRL | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_ALTER_FUNCTION]=    CF_CHANGES_DATA | CF_PROTECT_AGAINST_GRL | CF_AUTO_COMMIT_TRANS;
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  sql_command_flags[SQLCOM_INSTALL_PLUGIN]=    CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_UNINSTALL_PLUGIN]=  CF_CHANGES_DATA;

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  /*
    The following is used to preserver CF_ROW_COUNT during the
    a CALL or EXECUTE statement, so the value generated by the
    last called (or executed) statement is preserved.
    See mysql_execute_command() for how CF_ROW_COUNT is used.
  */
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  sql_command_flags[SQLCOM_CALL]=      CF_REEXECUTION_FRAGILE |
                                       CF_CAN_GENERATE_ROW_EVENTS;
  sql_command_flags[SQLCOM_EXECUTE]=   CF_CAN_GENERATE_ROW_EVENTS;
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  /*
    The following admin table operations are allowed
    on log tables.
  */
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  sql_command_flags[SQLCOM_REPAIR]=    CF_WRITE_LOGS_COMMAND | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_OPTIMIZE]|= CF_WRITE_LOGS_COMMAND | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_ANALYZE]=   CF_WRITE_LOGS_COMMAND | CF_AUTO_COMMIT_TRANS;

  sql_command_flags[SQLCOM_CREATE_USER]|=       CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_DROP_USER]|=         CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_RENAME_USER]|=       CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_REVOKE_ALL]=         CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_REVOKE]|=            CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_GRANT]|=             CF_AUTO_COMMIT_TRANS;

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  sql_command_flags[SQLCOM_ASSIGN_TO_KEYCACHE]= CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_PRELOAD_KEYS]=       CF_AUTO_COMMIT_TRANS;

  sql_command_flags[SQLCOM_FLUSH]=              CF_AUTO_COMMIT_TRANS;
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  sql_command_flags[SQLCOM_RESET]=              CF_AUTO_COMMIT_TRANS;
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  sql_command_flags[SQLCOM_CHECK]=              CF_AUTO_COMMIT_TRANS;
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}

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bool sqlcom_can_generate_row_events(const THD *thd)
{
  return (sql_command_flags[thd->lex->sql_command] &
          CF_CAN_GENERATE_ROW_EVENTS);
}
 
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bool is_update_query(enum enum_sql_command command)
{
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  DBUG_ASSERT(command >= 0 && command <= SQLCOM_END);
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  return (sql_command_flags[command] & CF_CHANGES_DATA) != 0;
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}
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/**
  Check if a sql command is allowed to write to log tables.
  @param command The SQL command
  @return true if writing is allowed
*/
bool is_log_table_write_query(enum enum_sql_command command)
{
  DBUG_ASSERT(command >= 0 && command <= SQLCOM_END);
  return (sql_command_flags[command] & CF_WRITE_LOGS_COMMAND) != 0;
}
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void execute_init_command(THD *thd, LEX_STRING *init_command,
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                          mysql_rwlock_t *var_lock)
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{
  Vio* save_vio;
  ulong save_client_capabilities;

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  mysql_rwlock_rdlock(var_lock);
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  if (!init_command->length)
  {
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    mysql_rwlock_unlock(var_lock);
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    return;
  }

  /*
    copy the value under a lock, and release the lock.
    init_command has to be executed without a lock held,
    as it may try to change itself
  */
  size_t len= init_command->length;
  char *buf= thd->strmake(init_command->str, len);
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  mysql_rwlock_unlock(var_lock);
462

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#if defined(ENABLED_PROFILING)
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  thd->profiling.start_new_query();
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  thd->profiling.set_query_source(buf, len);
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#endif

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  thd_proc_info(thd, "Execution of init_command");
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  save_client_capabilities= thd->client_capabilities;
  thd->client_capabilities|= CLIENT_MULTI_QUERIES;
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  /*
    We don't need return result of execution to client side.
    To forbid this we should set thd->net.vio to 0.
  */
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  save_vio= thd->net.vio;
  thd->net.vio= 0;
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  dispatch_command(COM_QUERY, thd, buf, len);
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  thd->client_capabilities= save_client_capabilities;
  thd->net.vio= save_vio;
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#if defined(ENABLED_PROFILING)
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  thd->profiling.finish_current_query();
#endif
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}


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static void handle_bootstrap_impl(THD *thd)
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{
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  MYSQL_FILE *file= bootstrap_file;
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  char *buff;
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  DBUG_ENTER("handle_bootstrap");

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#ifndef EMBEDDED_LIBRARY
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  pthread_detach_this_thread();
  thd->thread_stack= (char*) &thd;
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#endif /* EMBEDDED_LIBRARY */
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  thd_proc_info(thd, 0);
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  thd->version=refresh_version;
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  thd->security_ctx->priv_user=
    thd->security_ctx->user= (char*) my_strdup("boot", MYF(MY_WME));
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  thd->security_ctx->priv_host[0]=0;
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  /*
    Make the "client" handle multiple results. This is necessary
    to enable stored procedures with SELECTs and Dynamic SQL
    in init-file.
  */
  thd->client_capabilities|= CLIENT_MULTI_RESULTS;
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  buff= (char*) thd->net.buff;
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  thd->init_for_queries();
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  while (mysql_file_fgets(buff, thd->net.max_packet, file))
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  {
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    char *query;
    /* strlen() can't be deleted because mysql_file_fgets() doesn't return length */
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    ulong length= (ulong) strlen(buff);
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    while (buff[length-1] != '\n' && !mysql_file_feof(file))
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    {
      /*
        We got only a part of the current string. Will try to increase
        net buffer then read the rest of the current string.
      */
      /* purecov: begin tested */
      if (net_realloc(&(thd->net), 2 * thd->net.max_packet))
      {
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        thd->protocol->end_statement();
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        bootstrap_error= 1;
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        break;
      }
      buff= (char*) thd->net.buff;
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      mysql_file_fgets(buff + length, thd->net.max_packet - length, file);
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      length+= (ulong) strlen(buff + length);
      /* purecov: end */
    }
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    if (bootstrap_error)
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      break;                                    /* purecov: inspected */
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    while (length && (my_isspace(thd->charset(), buff[length-1]) ||
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                      buff[length-1] == ';'))
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      length--;
    buff[length]=0;
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    /* Skip lines starting with delimiter */
    if (strncmp(buff, STRING_WITH_LEN("delimiter")) == 0)
      continue;

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    query= (char *) thd->memdup_w_gap(buff, length + 1,
                                      thd->db_length + 1 +
                                      QUERY_CACHE_FLAGS_SIZE);
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    thd->set_query_and_id(query, length, next_query_id());
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    DBUG_PRINT("query",("%-.4096s",thd->query()));
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#if defined(ENABLED_PROFILING)
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    thd->profiling.start_new_query();
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    thd->profiling.set_query_source(thd->query(), length);
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#endif

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    /*
      We don't need to obtain LOCK_thread_count here because in bootstrap
      mode we have only one thread.
    */
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    thd->set_time();
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    Parser_state parser_state(thd, thd->query(), length);
    mysql_parse(thd, thd->query(), length, &parser_state);
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    close_thread_tables(thd);			// Free tables
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    bootstrap_error= thd->is_error();
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    thd->protocol->end_statement();
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#if defined(ENABLED_PROFILING)
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    thd->profiling.finish_current_query();
#endif

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    if (bootstrap_error)
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      break;

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    free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
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    free_root(&thd->transaction.mem_root,MYF(MY_KEEP_PREALLOC));
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  }
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  DBUG_VOID_RETURN;
}


/**
  Execute commands from bootstrap_file.

  Used when creating the initial grant tables.
*/

pthread_handler_t handle_bootstrap(void *arg)
{
  THD *thd=(THD*) arg;

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  mysql_thread_set_psi_id(thd->thread_id);

  do_handle_bootstrap(thd);
  return 0;
}

void do_handle_bootstrap(THD *thd)
{
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  /* The following must be called before DBUG_ENTER */
  thd->thread_stack= (char*) &thd;
  if (my_thread_init() || thd->store_globals())
  {
#ifndef EMBEDDED_LIBRARY
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
#endif
    thd->fatal_error();
    goto end;
  }

  handle_bootstrap_impl(thd);

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end:
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  net_end(&thd->net);
  thd->cleanup();
  delete thd;

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#ifndef EMBEDDED_LIBRARY
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  mysql_mutex_lock(&LOCK_thread_count);
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  thread_count--;
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  in_bootstrap= FALSE;
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  mysql_cond_broadcast(&COND_thread_count);
  mysql_mutex_unlock(&LOCK_thread_count);
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  my_thread_end();
  pthread_exit(0);
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#endif
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  return;
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}


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/**
  @brief Check access privs for a MERGE table and fix children lock types.

  @param[in]        thd         thread handle
  @param[in]        db          database name
  @param[in,out]    table_list  list of child tables (merge_list)
                                lock_type and optionally db set per table

  @return           status
    @retval         0           OK
    @retval         != 0        Error

  @detail
    This function is used for write access to MERGE tables only
    (CREATE TABLE, ALTER TABLE ... UNION=(...)). Set TL_WRITE for
    every child. Set 'db' for every child if not present.
*/
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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static bool check_merge_table_access(THD *thd, char *db,
                                     TABLE_LIST *table_list)
{
  int error= 0;

  if (table_list)
  {
    /* Check that all tables use the current database */
    TABLE_LIST *tlist;

    for (tlist= table_list; tlist; tlist= tlist->next_local)
    {
      if (!tlist->db || !tlist->db[0])
        tlist->db= db; /* purecov: inspected */
    }
    error= check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
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                              table_list, FALSE, UINT_MAX, FALSE);
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  }
  return error;
}
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#endif
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/* This works because items are allocated with sql_alloc() */

void free_items(Item *item)
{
  Item *next;
  DBUG_ENTER("free_items");
  for (; item ; item=next)
  {
    next=item->next;
    item->delete_self();
  }
  DBUG_VOID_RETURN;
}

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/**
   This works because items are allocated with sql_alloc().
   @note The function also handles null pointers (empty list).
*/
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void cleanup_items(Item *item)
{
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  DBUG_ENTER("cleanup_items");  
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  for (; item ; item=item->next)
    item->cleanup();
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  DBUG_VOID_RETURN;
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}

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#ifndef EMBEDDED_LIBRARY
702

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/**
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  Read one command from connection and execute it (query or simple command).
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  This function is called in loop from thread function.
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  For profiling to work, it must never be called recursively.

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  @retval
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    0  success
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  @retval
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    1  request of thread shutdown (see dispatch_command() description)
*/

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bool do_command(THD *thd)
{
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  bool return_value;
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  char *packet= 0;
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  ulong packet_length;
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  NET *net= &thd->net;
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  enum enum_server_command command;
  DBUG_ENTER("do_command");

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  /*
    indicator of uninitialized lex => normal flow of errors handling
    (see my_message_sql)
  */
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  thd->lex->current_select= 0;
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  /*
    This thread will do a blocking read from the client which
    will be interrupted when the next command is received from
    the client, the connection is closed or "net_wait_timeout"
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    number of seconds has passed.
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  */
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  my_net_set_read_timeout(net, thd->variables.net_wait_timeout);
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  /*
    XXX: this code is here only to clear possible errors of init_connect. 
    Consider moving to init_connect() instead.
  */
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  thd->clear_error();				// Clear error message
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  thd->stmt_da->reset_diagnostics_area();
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  net_new_transaction(net);
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  if ((packet_length= my_net_read(net)) == packet_error)
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  {
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    DBUG_PRINT("info",("Got error %d reading command from socket %s",
		       net->error,
		       vio_description(net->vio)));
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    /* Check if we can continue without closing the connection */
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    /* The error must be set. */
    DBUG_ASSERT(thd->is_error());
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    thd->protocol->end_statement();
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    if (net->error != 3)
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    {
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      return_value= TRUE;                       // We have to close it.
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      goto out;
    }
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    net->error= 0;
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    return_value= FALSE;
    goto out;
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  }
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  packet= (char*) net->read_pos;
  /*
    'packet_length' contains length of data, as it was stored in packet
    header. In case of malformed header, my_net_read returns zero.
    If packet_length is not zero, my_net_read ensures that the returned
    number of bytes was actually read from network.
    There is also an extra safety measure in my_net_read:
    it sets packet[packet_length]= 0, but only for non-zero packets.
  */
  if (packet_length == 0)                       /* safety */
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  {
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    /* Initialize with COM_SLEEP packet */
    packet[0]= (uchar) COM_SLEEP;
    packet_length= 1;
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  }
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  /* Do not rely on my_net_read, extra safety against programming errors. */
  packet[packet_length]= '\0';                  /* safety */

  command= (enum enum_server_command) (uchar) packet[0];

  if (command >= COM_END)
    command= COM_END;				// Wrong command

  DBUG_PRINT("info",("Command on %s = %d (%s)",
                     vio_description(net->vio), command,
                     command_name[command].str));
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  /* Restore read timeout value */
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  my_net_set_read_timeout(net, thd->variables.net_read_timeout);
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  DBUG_ASSERT(packet_length);
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  return_value= dispatch_command(command, thd, packet+1, (uint) (packet_length-1));

out:
  DBUG_RETURN(return_value);
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}
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#endif  /* EMBEDDED_LIBRARY */
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/**
  @brief Determine if an attempt to update a non-temporary table while the
    read-only option was enabled has been made.

  This is a helper function to mysql_execute_command.

  @note SQLCOM_MULTI_UPDATE is an exception and delt with elsewhere.

  @see mysql_execute_command
  @returns Status code
    @retval TRUE The statement should be denied.
    @retval FALSE The statement isn't updating any relevant tables.
*/

static my_bool deny_updates_if_read_only_option(THD *thd,
                                                TABLE_LIST *all_tables)
{
  DBUG_ENTER("deny_updates_if_read_only_option");

  if (!opt_readonly)
    DBUG_RETURN(FALSE);

  LEX *lex= thd->lex;

  const my_bool user_is_super=
    ((ulong)(thd->security_ctx->master_access & SUPER_ACL) ==
     (ulong)SUPER_ACL);

  if (user_is_super)
    DBUG_RETURN(FALSE);

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  if (!(sql_command_flags[lex->sql_command] & CF_CHANGES_DATA))
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    DBUG_RETURN(FALSE);

  /* Multi update is an exception and is dealt with later. */
  if (lex->sql_command == SQLCOM_UPDATE_MULTI)
    DBUG_RETURN(FALSE);

  const my_bool create_temp_tables= 
    (lex->sql_command == SQLCOM_CREATE_TABLE) &&
    (lex->create_info.options & HA_LEX_CREATE_TMP_TABLE);

  const my_bool drop_temp_tables= 
    (lex->sql_command == SQLCOM_DROP_TABLE) &&
    lex->drop_temporary;

  const my_bool update_real_tables=
    some_non_temp_table_to_be_updated(thd, all_tables) &&
    !(create_temp_tables || drop_temp_tables);


  const my_bool create_or_drop_databases=
    (lex->sql_command == SQLCOM_CREATE_DB) ||
    (lex->sql_command == SQLCOM_DROP_DB);

  if (update_real_tables || create_or_drop_databases)
  {
      /*
        An attempt was made to modify one or more non-temporary tables.
      */
      DBUG_RETURN(TRUE);
  }


  /* Assuming that only temporary tables are modified. */
  DBUG_RETURN(FALSE);
}
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/**
  Perform one connection-level (COM_XXXX) command.
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  @param command         type of command to perform
  @param thd             connection handle
  @param packet          data for the command, packet is always null-terminated
  @param packet_length   length of packet + 1 (to show that data is
                         null-terminated) except for COM_SLEEP, where it
                         can be zero.

  @todo
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    set thd->lex->sql_command to SQLCOM_END here.
  @todo
    The following has to be changed to an 8 byte integer
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  @retval
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    0   ok
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  @retval
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    1   request of thread shutdown, i. e. if command is
        COM_QUIT/COM_SHUTDOWN
*/
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bool dispatch_command(enum enum_server_command command, THD *thd,
		      char* packet, uint packet_length)
{
  NET *net= &thd->net;
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  bool error= 0;
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  DBUG_ENTER("dispatch_command");
903
  DBUG_PRINT("info",("packet: '%*.s'; command: %d", packet_length, packet, command));
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#if defined(ENABLED_PROFILING)
  thd->profiling.start_new_query();
#endif
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  MYSQL_COMMAND_START(thd->thread_id, command,
                      thd->security_ctx->priv_user,
                      (char *) thd->security_ctx->host_or_ip);
  
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  thd->command=command;
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  /*
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    Commands which always take a long time are logged into
    the slow log only if opt_log_slow_admin_statements is set.
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  */
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  thd->enable_slow_log= TRUE;
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  thd->lex->sql_command= SQLCOM_END; /* to avoid confusing VIEW detectors */
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  thd->set_time();
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  thd->set_query_id(get_query_id());
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  if (!(server_command_flags[command] & CF_SKIP_QUERY_ID))
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    next_query_id();
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  inc_thread_running();
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  if (!(server_command_flags[command] & CF_SKIP_QUESTIONS))
    statistic_increment(thd->status_var.questions, &LOCK_status);

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  /**
    Clear the set of flags that are expected to be cleared at the
    beginning of each command.
  */
  thd->server_status&= ~SERVER_STATUS_CLEAR_SET;
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  switch (command) {
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  case COM_INIT_DB:
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  {
    LEX_STRING tmp;
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    status_var_increment(thd->status_var.com_stat[SQLCOM_CHANGE_DB]);
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    thd->convert_string(&tmp, system_charset_info,
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			packet, packet_length, thd->charset());
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    if (!mysql_change_db(thd, &tmp, FALSE))
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    {
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      general_log_write(thd, command, thd->db, thd->db_length);
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      my_ok(thd);
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    }
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    break;
  }
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#ifdef HAVE_REPLICATION
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  case COM_REGISTER_SLAVE:
  {
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    if (!register_slave(thd, (uchar*)packet, packet_length))
951
      my_ok(thd);
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    break;
  }
954
#endif
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  case COM_CHANGE_USER:
  {
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    status_var_increment(thd->status_var.com_other);
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    char *user= (char*) packet, *packet_end= packet + packet_length;
    /* Safe because there is always a trailing \0 at the end of the packet */
960 961
    char *passwd= strend(user)+1;

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962
    thd->change_user();
963
    thd->clear_error();                         // if errors from rollback
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964

965
    /*
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966 967 968
      Old clients send null-terminated string ('\0' for empty string) for
      password.  New clients send the size (1 byte) + string (not null
      terminated, so also '\0' for empty string).
969 970 971

      Cast *passwd to an unsigned char, so that it doesn't extend the sign
      for *passwd > 127 and become 2**32-127 after casting to uint.
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972
    */
973
    char db_buff[NAME_LEN+1];                 // buffer to store db in utf8
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974
    char *db= passwd;
975
    char *save_db;
976 977 978 979 980 981 982 983 984
    /*
      If there is no password supplied, the packet must contain '\0',
      in any type of handshake (4.1 or pre-4.1).
     */
    if (passwd >= packet_end)
    {
      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
      break;
    }
985
    uint passwd_len= (thd->client_capabilities & CLIENT_SECURE_CONNECTION ?
986
                      (uchar)(*passwd++) : strlen(passwd));
987 988
    uint dummy_errors, save_db_length, db_length;
    int res;
989 990 991
    Security_context save_security_ctx= *thd->security_ctx;
    USER_CONN *save_user_connect;

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992
    db+= passwd_len + 1;
993 994 995 996 997
    /*
      Database name is always NUL-terminated, so in case of empty database
      the packet must contain at least the trailing '\0'.
    */
    if (db >= packet_end)
998
    {
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999
      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
1000 1001
      break;
    }
1002 1003
    db_length= strlen(db);

1004
    char *ptr= db + db_length + 1;
1005 1006
    uint cs_number= 0;

1007 1008 1009 1010 1011 1012 1013 1014 1015 1016
    if (ptr < packet_end)
    {
      if (ptr + 2 > packet_end)
      {
        my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
        break;
      }

      cs_number= uint2korr(ptr);
    }
1017

1018
    /* Convert database name to utf8 */
1019
    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
1020
                             system_charset_info, db, db_length,
1021
                             thd->charset(), &dummy_errors)]= 0;
1022
    db= db_buff;
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1023

1024
    /* Save user and privileges */
1025 1026 1027
    save_db_length= thd->db_length;
    save_db= thd->db;
    save_user_connect= thd->user_connect;
1028 1029

    if (!(thd->security_ctx->user= my_strdup(user, MYF(0))))
1030
    {
1031
      thd->security_ctx->user= save_security_ctx.user;
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1032
      my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
1033 1034
      break;
    }
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1035

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1036 1037
    /* Clear variables that are allocated */
    thd->user_connect= 0;
1038
    thd->security_ctx->priv_user= thd->security_ctx->user;
1039
    res= check_user(thd, COM_CHANGE_USER, passwd, passwd_len, db, FALSE);
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1040

1041 1042
    if (res)
    {
1043 1044
      x_free(thd->security_ctx->user);
      *thd->security_ctx= save_security_ctx;
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1045
      thd->user_connect= save_user_connect;
1046 1047 1048 1049 1050
      thd->db= save_db;
      thd->db_length= save_db_length;
    }
    else
    {
1051
#ifndef NO_EMBEDDED_ACCESS_CHECKS
1052
      /* we've authenticated new user */
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1053 1054
      if (save_user_connect)
	decrease_user_connections(save_user_connect);
1055
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
1056 1057
      x_free(save_db);
      x_free(save_security_ctx.user);
1058 1059 1060 1061 1062 1063

      if (cs_number)
      {
        thd_init_client_charset(thd, cs_number);
        thd->update_charset();
      }
1064
    }
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1065 1066
    break;
  }
1067
  case COM_STMT_EXECUTE:
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1068
  {
1069
    mysqld_stmt_execute(thd, packet, packet_length);
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1070 1071
    break;
  }
1072
  case COM_STMT_FETCH:
1073
  {
1074
    mysqld_stmt_fetch(thd, packet, packet_length);
1075 1076
    break;
  }
1077
  case COM_STMT_SEND_LONG_DATA:
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1078
  {
1079
    mysql_stmt_get_longdata(thd, packet, packet_length);
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1080 1081
    break;
  }
1082
  case COM_STMT_PREPARE:
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1083
  {
1084
    mysqld_stmt_prepare(thd, packet, packet_length);
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1085 1086
    break;
  }
1087
  case COM_STMT_CLOSE:
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1088
  {
1089
    mysqld_stmt_close(thd, packet);
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1090 1091
    break;
  }
1092
  case COM_STMT_RESET:
1093
  {
1094
    mysqld_stmt_reset(thd, packet);
1095 1096
    break;
  }
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1097 1098
  case COM_QUERY:
  {
1099 1100
    if (alloc_query(thd, packet, packet_length))
      break;					// fatal error is set
1101
    MYSQL_QUERY_START(thd->query(), thd->thread_id,
1102 1103 1104
                      (char *) (thd->db ? thd->db : ""),
                      thd->security_ctx->priv_user,
                      (char *) thd->security_ctx->host_or_ip);
1105
    char *packet_end= thd->query() + thd->query_length();
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1106
    /* 'b' stands for 'buffer' parameter', special for 'my_snprintf' */
1107

1108 1109
    general_log_write(thd, command, thd->query(), thd->query_length());
    DBUG_PRINT("query",("%-.4096s",thd->query()));
1110
#if defined(ENABLED_PROFILING)
1111
    thd->profiling.set_query_source(thd->query(), thd->query_length());
1112
#endif
1113
    Parser_state parser_state(thd, thd->query(), thd->query_length());
1114

1115
    mysql_parse(thd, thd->query(), thd->query_length(), &parser_state);
1116

1117 1118
    while (!thd->killed && (parser_state.m_lip.found_semicolon != NULL) &&
           ! thd->is_error())
1119
    {
1120 1121
      char *beginning_of_next_stmt= (char*)
        parser_state.m_lip.found_semicolon;
1122

1123
      thd->protocol->end_statement();
1124
      query_cache_end_of_result(thd);
1125
      /*
1126 1127
        Multiple queries exits, execute them individually
      */
1128
      close_thread_tables(thd);
1129
      ulong length= (ulong)(packet_end - beginning_of_next_stmt);
1130

1131
      log_slow_statement(thd);
1132

1133
      /* Remove garbage at start of query */
1134
      while (length > 0 && my_isspace(thd->charset(), *beginning_of_next_stmt))
1135
      {
1136
        beginning_of_next_stmt++;
1137 1138
        length--;
      }
1139

1140 1141 1142 1143 1144
      if (MYSQL_QUERY_DONE_ENABLED())
      {
        MYSQL_QUERY_DONE(thd->is_error());
      }

1145
#if defined(ENABLED_PROFILING)
1146 1147 1148 1149 1150
      thd->profiling.finish_current_query();
      thd->profiling.start_new_query("continuing");
      thd->profiling.set_query_source(beginning_of_next_stmt, length);
#endif

1151
      MYSQL_QUERY_START(beginning_of_next_stmt, thd->thread_id,
1152 1153 1154 1155
                        (char *) (thd->db ? thd->db : ""),
                        thd->security_ctx->priv_user,
                        (char *) thd->security_ctx->host_or_ip);

1156
      thd->set_query_and_id(beginning_of_next_stmt, length, next_query_id());
1157 1158 1159 1160
      /*
        Count each statement from the client.
      */
      statistic_increment(thd->status_var.questions, &LOCK_status);
1161
      thd->set_time(); /* Reset the query start time. */
1162
      parser_state.reset(beginning_of_next_stmt, length);
1163
      /* TODO: set thd->lex->sql_command to SQLCOM_END here */
1164
      mysql_parse(thd, beginning_of_next_stmt, length, &parser_state);
1165 1166
    }

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1167 1168 1169
    DBUG_PRINT("info",("query ready"));
    break;
  }
1170
  case COM_FIELD_LIST:				// This isn't actually needed
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1171
#ifdef DONT_ALLOW_SHOW_COMMANDS
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1172 1173
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0));	/* purecov: inspected */
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1174 1175 1176
    break;
#else
  {
1177
    char *fields, *packet_end= packet + packet_length, *arg_end;
1178
    /* Locked closure of all tables */
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1179
    TABLE_LIST table_list;
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1180
    LEX_STRING conv_name;
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1181

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1182
    /* used as fields initializator */
1183
    lex_start(thd);
1184

1185
    status_var_increment(thd->status_var.com_stat[SQLCOM_SHOW_FIELDS]);
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1186
    bzero((char*) &table_list,sizeof(table_list));
1187
    if (thd->copy_db_to(&table_list.db, &table_list.db_length))
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1188
      break;
1189 1190 1191 1192
    /*
      We have name + wildcard in packet, separated by endzero
    */
    arg_end= strend(packet);
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1193
    uint arg_length= arg_end - packet;
1194 1195 1196 1197 1198 1199 1200
    
    /* Check given table name length. */
    if (arg_length >= packet_length || arg_length > NAME_LEN)
    {
      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
      break;
    }
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1201
    thd->convert_string(&conv_name, system_charset_info,
1202
			packet, arg_length, thd->charset());
1203
    if (check_table_name(conv_name.str, conv_name.length, FALSE))
1204 1205 1206 1207 1208 1209
    {
      /* this is OK due to convert_string() null-terminating the string */
      my_error(ER_WRONG_TABLE_NAME, MYF(0), conv_name.str);
      break;
    }

1210
    table_list.alias= table_list.table_name= conv_name.str;
1211
    packet= arg_end + 1;
1212

1213
    if (is_infoschema_db(table_list.db, table_list.db_length))
1214 1215 1216 1217 1218 1219
    {
      ST_SCHEMA_TABLE *schema_table= find_schema_table(thd, table_list.alias);
      if (schema_table)
        table_list.schema_table= schema_table;
    }

Gleb Shchepa's avatar
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1220 1221
    uint query_length= (uint) (packet_end - packet); // Don't count end \0
    if (!(fields= (char *) thd->memdup(packet, query_length + 1)))
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1222
      break;
1223
    thd->set_query(fields, query_length);
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1224
    general_log_print(thd, command, "%s %s", table_list.table_name, fields);
1225
    if (lower_case_table_names)
1226
      my_casedn_str(files_charset_info, table_list.table_name);
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1227

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1228 1229 1230 1231
    if (check_access(thd, SELECT_ACL, table_list.db,
                     &table_list.grant.privilege,
                     &table_list.grant.m_internal,
                     0, 0))
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1232
      break;
1233
    if (check_grant(thd, SELECT_ACL, &table_list, TRUE, UINT_MAX, FALSE))
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1234
      break;
1235 1236
    /* init structures for VIEW processing */
    table_list.select_lex= &(thd->lex->select_lex);
1237 1238 1239 1240

    lex_start(thd);
    mysql_reset_thd_for_next_command(thd);

1241
    thd->lex->
1242 1243
      select_lex.table_list.link_in_list((uchar*) &table_list,
                                         (uchar**) &table_list.next_local);
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1244
    thd->lex->add_to_query_tables(&table_list);
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1245
    init_mdl_requests(&table_list);
1246

1247 1248
    /* switch on VIEW optimisation: do not fill temporary tables */
    thd->lex->sql_command= SQLCOM_SHOW_FIELDS;
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1249
    mysqld_list_fields(thd,&table_list,fields);
1250
    thd->lex->unit.cleanup();
1251
    thd->cleanup_after_query();
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1252 1253 1254 1255
    break;
  }
#endif
  case COM_QUIT:
1256
    /* We don't calculate statistics for this command */
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1257
    general_log_print(thd, command, NullS);
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1258
    net->error=0;				// Don't give 'abort' message
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1259
    thd->stmt_da->disable_status();              // Don't send anything back
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1260 1261
    error=TRUE;					// End server
    break;
1262
#ifndef EMBEDDED_LIBRARY
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1263 1264
  case COM_BINLOG_DUMP:
    {
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1265 1266 1267 1268
      ulong pos;
      ushort flags;
      uint32 slave_server_id;

1269
      status_var_increment(thd->status_var.com_other);
1270
      thd->enable_slow_log= opt_log_slow_admin_statements;
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1271
      if (check_global_access(thd, REPL_SLAVE_ACL))
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1272
	break;
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1273

1274
      /* TODO: The following has to be changed to an 8 byte integer */
1275 1276
      pos = uint4korr(packet);
      flags = uint2korr(packet + 4);
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1277
      thd->server_id=0; /* avoid suicide */
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1278
      if ((slave_server_id= uint4korr(packet+6))) // mysqlbinlog.server_id==0
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1279
	kill_zombie_dump_threads(slave_server_id);
1280
      thd->server_id = slave_server_id;
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1281

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1282
      general_log_print(thd, command, "Log: '%s'  Pos: %ld", packet+10,
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1283
                      (long) pos);
1284
      mysql_binlog_send(thd, thd->strdup(packet + 10), (my_off_t) pos, flags);
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1285
      unregister_slave(thd,1,1);
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1286
      /*  fake COM_QUIT -- if we get here, the thread needs to terminate */
1287
      error = TRUE;
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1288 1289
      break;
    }
1290
#endif
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1291
  case COM_REFRESH:
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1292 1293
  {
    bool not_used;
1294
    status_var_increment(thd->status_var.com_stat[SQLCOM_FLUSH]);
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1295
    ulong options= (ulong) (uchar) packet[0];
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1296
    if (trans_commit_implicit(thd))
Konstantin Osipov's avatar
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1297
      break;
1298
    close_thread_tables(thd);
1299
    thd->mdl_context.release_transactional_locks();
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1300
    if (check_global_access(thd,RELOAD_ACL))
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1301
      break;
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1302
    general_log_print(thd, command, NullS);
1303
#ifndef DBUG_OFF
1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318
    bool debug_simulate= FALSE;
    DBUG_EXECUTE_IF("simulate_detached_thread_refresh", debug_simulate= TRUE;);
    if (debug_simulate)
    {
      /*
        Simulate a reload without a attached thread session.
        Provides a environment similar to that of when the
        server receives a SIGHUP signal and reloads caches
        and flushes tables.
      */
      bool res;
      my_pthread_setspecific_ptr(THR_THD, NULL);
      res= reload_acl_and_cache(NULL, options | REFRESH_FAST,
                                NULL, &not_used);
      my_pthread_setspecific_ptr(THR_THD, thd);
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1319 1320
      if (res)
        break;
1321
    }
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1322
    else
1323
#endif
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1324 1325
    if (reload_acl_and_cache(thd, options, (TABLE_LIST*) 0, &not_used))
      break;
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1326
    if (trans_commit_implicit(thd))
Konstantin Osipov's avatar
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1327
      break;
1328
    close_thread_tables(thd);
1329
    thd->mdl_context.release_transactional_locks();
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Konstantin Osipov committed
1330
    my_ok(thd);
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1331 1332
    break;
  }
1333
#ifndef EMBEDDED_LIBRARY
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1334
  case COM_SHUTDOWN:
1335
  {
1336
    status_var_increment(thd->status_var.com_other);
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1337
    if (check_global_access(thd,SHUTDOWN_ACL))
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1338
      break; /* purecov: inspected */
1339
    /*
1340
      If the client is < 4.1.3, it is going to send us no argument; then
1341
      packet_length is 0, packet[0] is the end 0 of the packet. Note that
1342 1343
      SHUTDOWN_DEFAULT is 0. If client is >= 4.1.3, the shutdown level is in
      packet[0].
1344
    */
1345 1346
    enum mysql_enum_shutdown_level level=
      (enum mysql_enum_shutdown_level) (uchar) packet[0];
1347 1348 1349 1350 1351 1352 1353
    if (level == SHUTDOWN_DEFAULT)
      level= SHUTDOWN_WAIT_ALL_BUFFERS; // soon default will be configurable
    else if (level != SHUTDOWN_WAIT_ALL_BUFFERS)
    {
      my_error(ER_NOT_SUPPORTED_YET, MYF(0), "this shutdown level");
      break;
    }
1354
    DBUG_PRINT("quit",("Got shutdown command for level %u", level));
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1355
    general_log_print(thd, command, NullS);
1356
    my_eof(thd);
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1357 1358 1359 1360
    close_thread_tables(thd);			// Free before kill
    kill_mysql();
    error=TRUE;
    break;
1361
  }
1362
#endif
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1363 1364
  case COM_STATISTICS:
  {
1365 1366 1367
    STATUS_VAR current_global_status_var;
    ulong uptime;
    uint length;
1368
    ulonglong queries_per_second1000;
1369 1370
    char buff[250];
    uint buff_len= sizeof(buff);
1371

1372
    general_log_print(thd, command, NullS);
1373
    status_var_increment(thd->status_var.com_stat[SQLCOM_SHOW_STATUS]);
1374
    calc_sum_of_all_status(&current_global_status_var);
1375 1376 1377 1378 1379
    if (!(uptime= (ulong) (thd->start_time - server_start_time)))
      queries_per_second1000= 0;
    else
      queries_per_second1000= thd->query_id * LL(1000) / uptime;

1380 1381 1382
    length= my_snprintf((char*) buff, buff_len - 1,
                        "Uptime: %lu  Threads: %d  Questions: %lu  "
                        "Slow queries: %lu  Opens: %lu  Flush tables: %lu  "
1383
                        "Open tables: %u  Queries per second avg: %u.%u",
1384 1385 1386 1387 1388 1389
                        uptime,
                        (int) thread_count, (ulong) thd->query_id,
                        current_global_status_var.long_query_count,
                        current_global_status_var.opened_tables,
                        refresh_version,
                        cached_open_tables(),
1390 1391
                        (uint) (queries_per_second1000 / 1000),
                        (uint) (queries_per_second1000 % 1000));
1392 1393
#ifdef EMBEDDED_LIBRARY
    /* Store the buffer in permanent memory */
1394
    my_ok(thd, 0, 0, buff);
1395
#endif
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1396
#ifdef SAFEMALLOC
1397
    if (sf_malloc_cur_memory)				// Using SAFEMALLOC
1398 1399 1400 1401 1402 1403 1404
    {
      char *end= buff + length;
      length+= my_snprintf(end, buff_len - length - 1,
                           end,"  Memory in use: %ldK  Max memory used: %ldK",
                           (sf_malloc_cur_memory+1023L)/1024L,
                           (sf_malloc_max_memory+1023L)/1024L);
    }
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1405 1406
#endif
#ifndef EMBEDDED_LIBRARY
Konstantin Osipov's avatar
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1407 1408
    (void) my_net_write(net, (uchar*) buff, length);
    (void) net_flush(net);
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Marc Alff committed
1409
    thd->stmt_da->disable_status();
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1410
#endif
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1411 1412 1413
    break;
  }
  case COM_PING:
1414
    status_var_increment(thd->status_var.com_other);
1415
    my_ok(thd);				// Tell client we are alive
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1416 1417
    break;
  case COM_PROCESS_INFO:
1418
    status_var_increment(thd->status_var.com_stat[SQLCOM_SHOW_PROCESSLIST]);
1419 1420
    if (!thd->security_ctx->priv_user[0] &&
        check_global_access(thd, PROCESS_ACL))
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1421
      break;
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1422
    general_log_print(thd, command, NullS);
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    mysqld_list_processes(thd,
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			  thd->security_ctx->master_access & PROCESS_ACL ? 
			  NullS : thd->security_ctx->priv_user, 0);
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    break;
  case COM_PROCESS_KILL:
  {
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    status_var_increment(thd->status_var.com_stat[SQLCOM_KILL]);
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    ulong id=(ulong) uint4korr(packet);
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    sql_kill(thd,id,false);
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    break;
  }
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  case COM_SET_OPTION:
  {
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    status_var_increment(thd->status_var.com_stat[SQLCOM_SET_OPTION]);
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    uint opt_command= uint2korr(packet);

    switch (opt_command) {
    case (int) MYSQL_OPTION_MULTI_STATEMENTS_ON:
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      thd->client_capabilities|= CLIENT_MULTI_STATEMENTS;
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      my_eof(thd);
1443
      break;
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    case (int) MYSQL_OPTION_MULTI_STATEMENTS_OFF:
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      thd->client_capabilities&= ~CLIENT_MULTI_STATEMENTS;
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      my_eof(thd);
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      break;
    default:
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      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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      break;
    }
    break;
  }
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  case COM_DEBUG:
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    status_var_increment(thd->status_var.com_other);
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    if (check_global_access(thd, SUPER_ACL))
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      break;					/* purecov: inspected */
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    mysql_print_status();
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    general_log_print(thd, command, NullS);
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    my_eof(thd);
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    break;
  case COM_SLEEP:
  case COM_CONNECT:				// Impossible here
  case COM_TIME:				// Impossible from client
  case COM_DELAYED_INSERT:
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  case COM_END:
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  default:
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    my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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    break;
  }
1471

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  /* report error issued during command execution */
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  if (thd->killed_errno())
  {
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    if (! thd->stmt_da->is_set())
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      thd->send_kill_message();
  }
  if (thd->killed == THD::KILL_QUERY || thd->killed == THD::KILL_BAD_DATA)
  {
    thd->killed= THD::NOT_KILLED;
    thd->mysys_var->abort= 0;
  }

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  /* If commit fails, we should be able to reset the OK status. */
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  thd->stmt_da->can_overwrite_status= TRUE;
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  thd->is_error() ? trans_rollback_stmt(thd) : trans_commit_stmt(thd);
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  thd->stmt_da->can_overwrite_status= FALSE;
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  thd->transaction.stmt.reset();

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  thd->protocol->end_statement();
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  query_cache_end_of_result(thd);
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  thd->proc_info= "closing tables";
  /* Free tables */
  close_thread_tables(thd);

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  if (!thd->is_error() && !thd->killed_errno())
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    mysql_audit_general(thd, MYSQL_AUDIT_GENERAL_RESULT, 0, 0);
1500

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  log_slow_statement(thd);
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  thd_proc_info(thd, "cleaning up");
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  thd->set_query(NULL, 0);
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  thd->command=COM_SLEEP;
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  dec_thread_running();
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  thd_proc_info(thd, 0);
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  thd->packet.shrink(thd->variables.net_buffer_length);	// Reclaim some memory
  free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
1510

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#if defined(ENABLED_PROFILING)
  thd->profiling.finish_current_query();
#endif
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  if (MYSQL_QUERY_DONE_ENABLED() || MYSQL_COMMAND_DONE_ENABLED())
  {
    int res;
    res= (int) thd->is_error();
    if (command == COM_QUERY)
    {
      MYSQL_QUERY_DONE(res);
    }
    MYSQL_COMMAND_DONE(res);
  }
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  DBUG_RETURN(error);
}


1528
void log_slow_statement(THD *thd)
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{
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  DBUG_ENTER("log_slow_statement");
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  /*
    The following should never be true with our current code base,
    but better to keep this here so we don't accidently try to log a
    statement in a trigger or stored function
  */
  if (unlikely(thd->in_sub_stmt))
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    DBUG_VOID_RETURN;                           // Don't set time for sub stmt
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  /*
    Do not log administrative statements unless the appropriate option is
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    set.
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  */
1544
  if (thd->enable_slow_log)
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  {
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    ulonglong end_utime_of_query= thd->current_utime();
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    thd_proc_info(thd, "logging slow query");
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    if (((end_utime_of_query - thd->utime_after_lock) >
         thd->variables.long_query_time ||
         ((thd->server_status &
           (SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED)) &&
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          opt_log_queries_not_using_indexes &&
           !(sql_command_flags[thd->lex->sql_command] & CF_STATUS_COMMAND))) &&
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        thd->examined_row_count >= thd->variables.min_examined_row_limit)
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    {
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      thd_proc_info(thd, "logging slow query");
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      thd->status_var.long_query_count++;
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      slow_log_print(thd, thd->query(), thd->query_length(), 
                     end_utime_of_query);
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    }
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  }
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  DBUG_VOID_RETURN;
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}

1566

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/**
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  Create a TABLE_LIST object for an INFORMATION_SCHEMA table.

    This function is used in the parser to convert a SHOW or DESCRIBE
    table_name command to a SELECT from INFORMATION_SCHEMA.
    It prepares a SELECT_LEX and a TABLE_LIST object to represent the
    given command as a SELECT parse tree.

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  @param thd              thread handle
  @param lex              current lex
  @param table_ident      table alias if it's used
  @param schema_table_idx the type of the INFORMATION_SCHEMA table to be
                          created

  @note
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    Due to the way this function works with memory and LEX it cannot
    be used outside the parser (parse tree transformations outside
    the parser break PS and SP).

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  @retval
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    0                 success
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  @retval
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    1                 out of memory or SHOW commands are not allowed
                      in this version of the server.
*/

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int prepare_schema_table(THD *thd, LEX *lex, Table_ident *table_ident,
                         enum enum_schema_tables schema_table_idx)
{
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  SELECT_LEX *schema_select_lex= NULL;
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  DBUG_ENTER("prepare_schema_table");
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1599
  switch (schema_table_idx) {
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  case SCH_SCHEMATA:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
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    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0));   /* purecov: inspected */
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    DBUG_RETURN(1);
#else
    break;
#endif
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  case SCH_TABLE_NAMES:
  case SCH_TABLES:
  case SCH_VIEWS:
1612
  case SCH_TRIGGERS:
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  case SCH_EVENTS:
1614
#ifdef DONT_ALLOW_SHOW_COMMANDS
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    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */
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    DBUG_RETURN(1);
#else
    {
1620
      LEX_STRING db;
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      size_t dummy;
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      if (lex->select_lex.db == NULL &&
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          lex->copy_db_to(&lex->select_lex.db, &dummy))
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      {
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        DBUG_RETURN(1);
1626
      }
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      schema_select_lex= new SELECT_LEX();
      db.str= schema_select_lex->db= lex->select_lex.db;
      schema_select_lex->table_list.first= NULL;
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      db.length= strlen(db.str);
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1632
      if (check_db_name(&db))
1633
      {
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        my_error(ER_WRONG_DB_NAME, MYF(0), db.str);
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        DBUG_RETURN(1);
      }
      break;
    }
#endif
  case SCH_COLUMNS:
  case SCH_STATISTICS:
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  {
1643
#ifdef DONT_ALLOW_SHOW_COMMANDS
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    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */
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    DBUG_RETURN(1);
#else
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    DBUG_ASSERT(table_ident);
    TABLE_LIST **query_tables_last= lex->query_tables_last;
    schema_select_lex= new SELECT_LEX();
    /* 'parent_lex' is used in init_query() so it must be before it. */
    schema_select_lex->parent_lex= lex;
    schema_select_lex->init_query();
1654 1655
    if (!schema_select_lex->add_table_to_list(thd, table_ident, 0, 0, TL_READ,
                                              MDL_SHARED_READ))
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      DBUG_RETURN(1);
    lex->query_tables_last= query_tables_last;
    break;
  }
1660
#endif
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  case SCH_PROFILES:
    /* 
      Mark this current profiling record to be discarded.  We don't
      wish to have SHOW commands show up in profiling.
    */
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#if defined(ENABLED_PROFILING)
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    thd->profiling.discard_current_query();
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#endif
    break;
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  case SCH_OPEN_TABLES:
  case SCH_VARIABLES:
  case SCH_STATUS:
1673 1674
  case SCH_PROCEDURES:
  case SCH_CHARSETS:
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  case SCH_ENGINES:
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  case SCH_COLLATIONS:
  case SCH_COLLATION_CHARACTER_SET_APPLICABILITY:
  case SCH_USER_PRIVILEGES:
  case SCH_SCHEMA_PRIVILEGES:
  case SCH_TABLE_PRIVILEGES:
  case SCH_COLUMN_PRIVILEGES:
  case SCH_TABLE_CONSTRAINTS:
  case SCH_KEY_COLUMN_USAGE:
  default:
    break;
  }
  
  SELECT_LEX *select_lex= lex->current_select;
  if (make_schema_select(thd, select_lex, schema_table_idx))
  {
    DBUG_RETURN(1);
  }
  TABLE_LIST *table_list= (TABLE_LIST*) select_lex->table_list.first;
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  table_list->schema_select_lex= schema_select_lex;
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  table_list->schema_table_reformed= 1;
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  DBUG_RETURN(0);
}


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/**
  Implementation of FLUSH TABLES <table_list> WITH READ LOCK.

  In brief: take exclusive locks, expel tables from the table
  cache, reopen the tables, enter the 'LOCKED TABLES' mode,
  downgrade the locks.

  Required privileges
  -------------------
  Since the statement implicitly enters LOCK TABLES mode,
  it requires LOCK TABLES privilege on every table.
  But since the rest of FLUSH commands require
  the global RELOAD_ACL, it also requires RELOAD_ACL.

  Compatibility with the global read lock
  ---------------------------------------
  We don't wait for the GRL, since neither the
  5.1 combination that this new statement is intended to
  replace (LOCK TABLE <list> WRITE; FLUSH TABLES;),
  nor FLUSH TABLES WITH READ LOCK do.
  @todo: this is not implemented, Dmitry disagrees.
  Currently we wait for GRL in another connection,
  but are compatible with a GRL in our own connection.

  Behaviour under LOCK TABLES
  ---------------------------
  Bail out: i.e. don't perform an implicit UNLOCK TABLES.
  This is not consistent with LOCK TABLES statement, but is
  in line with behaviour of FLUSH TABLES WITH READ LOCK, and we
  try to not introduce any new statements with implicit
  semantics.

  Compatibility with parallel updates
  -----------------------------------
  As a result, we will wait for all open transactions
  against the tables to complete. After the lock downgrade,
  new transactions will be able to read the tables, but not
  write to them.

  Differences from FLUSH TABLES <list>
  -------------------------------------
  - you can't flush WITH READ LOCK a non-existent table
  - you can't flush WITH READ LOCK under LOCK TABLES
  - currently incompatible with the GRL (@todo: fix)
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  Effect on views and temporary tables.
  ------------------------------------
  You can only apply this command to existing base tables.
  If a view with such name exists, ER_WRONG_OBJECT is returned.
  If a temporary table with such name exists, it's ignored:
  if there is a base table, it's used, otherwise ER_NO_SUCH_TABLE
  is returned.
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*/

static bool flush_tables_with_read_lock(THD *thd, TABLE_LIST *all_tables)
{
  Lock_tables_prelocking_strategy lock_tables_prelocking_strategy;
  TABLE_LIST *table_list;

  /*
    This is called from SQLCOM_FLUSH, the transaction has
    been committed implicitly.
  */

  /* RELOAD_ACL is checked by the caller. Check table-level privileges. */
  if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, all_tables,
                         FALSE, UINT_MAX, FALSE))
    goto error;

  if (thd->locked_tables_mode)
  {
    my_error(ER_LOCK_OR_ACTIVE_TRANSACTION, MYF(0));
    goto error;
  }

  /*
    @todo: Since lock_table_names() acquires a global IX
    lock, this actually waits for a GRL in another connection.
    We are thus introducing an incompatibility.
    Do nothing for now, since not taking a global IX violates
    current internal MDL asserts, fix after discussing with
    Dmitry.
  */
  if (lock_table_names(thd, all_tables))
    goto error;

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  for (table_list= all_tables; table_list;
       table_list= table_list->next_global)
  {
    /* Remove the table from cache. */
    mysql_mutex_lock(&LOCK_open);
    tdc_remove_table(thd, TDC_RT_REMOVE_ALL,
                     table_list->db,
                     table_list->table_name);
    mysql_mutex_unlock(&LOCK_open);

    /* Skip views and temporary tables. */
    table_list->required_type= FRMTYPE_TABLE; /* Don't try to flush views. */
    table_list->open_type= OT_BASE_ONLY;      /* Ignore temporary tables. */
  }

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  if  (open_and_lock_tables(thd, all_tables, FALSE,
                            MYSQL_OPEN_HAS_MDL_LOCK,
                            &lock_tables_prelocking_strategy) ||
       thd->locked_tables_list.init_locked_tables(thd))
  {
    close_thread_tables(thd);
    goto error;
  }

  /*
    Downgrade the exclusive locks.
    Use MDL_SHARED_NO_WRITE as the intended
    post effect of this call is identical
    to LOCK TABLES <...> READ, and we didn't use
    thd->in_lock_talbes and thd->sql_command= SQLCOM_LOCK_TABLES
    hacks to enter the LTM.
    @todo: release the global IX lock here!!!
  */
  for (table_list= all_tables; table_list;
       table_list= table_list->next_global)
    table_list->mdl_request.ticket->downgrade_exclusive_lock(MDL_SHARED_NO_WRITE);

  return FALSE;

error:
  return TRUE;
}


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/**
  Read query from packet and store in thd->query.
  Used in COM_QUERY and COM_STMT_PREPARE.
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    Sets the following THD variables:
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  - query
  - query_length
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  @retval
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    FALSE ok
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  @retval
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    TRUE  error;  In this case thd->fatal_error is set
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*/

1844
bool alloc_query(THD *thd, const char *packet, uint packet_length)
1845
{
1846
  char *query;
1847
  /* Remove garbage at start and end of query */
1848
  while (packet_length > 0 && my_isspace(thd->charset(), packet[0]))
1849 1850 1851 1852
  {
    packet++;
    packet_length--;
  }
1853
  const char *pos= packet + packet_length;     // Point at end null
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  while (packet_length > 0 &&
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	 (pos[-1] == ';' || my_isspace(thd->charset() ,pos[-1])))
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  {
    pos--;
    packet_length--;
  }
  /* We must allocate some extra memory for query cache */
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  if (! (query= (char*) thd->memdup_w_gap(packet,
                                          packet_length,
                                          1 + thd->db_length +
                                          QUERY_CACHE_FLAGS_SIZE)))
      return TRUE;
  query[packet_length]= '\0';
  thd->set_query(query, packet_length);
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  /* Reclaim some memory */
  thd->packet.shrink(thd->variables.net_buffer_length);
  thd->convert_buffer.shrink(thd->variables.net_buffer_length);
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  return FALSE;
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}

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static void reset_one_shot_variables(THD *thd) 
{
  thd->variables.character_set_client=
    global_system_variables.character_set_client;
  thd->variables.collation_connection=
    global_system_variables.collation_connection;
  thd->variables.collation_database=
    global_system_variables.collation_database;
  thd->variables.collation_server=
    global_system_variables.collation_server;
  thd->update_charset();
  thd->variables.time_zone=
    global_system_variables.time_zone;
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  thd->variables.lc_time_names= &my_locale_en_US;
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  thd->one_shot_set= 0;
}

1893

1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939
static
bool sp_process_definer(THD *thd)
{
  DBUG_ENTER("sp_process_definer");

  LEX *lex= thd->lex;

  /*
    If the definer is not specified, this means that CREATE-statement missed
    DEFINER-clause. DEFINER-clause can be missed in two cases:

      - The user submitted a statement w/o the clause. This is a normal
        case, we should assign CURRENT_USER as definer.

      - Our slave received an updated from the master, that does not
        replicate definer for stored rountines. We should also assign
        CURRENT_USER as definer here, but also we should mark this routine
        as NON-SUID. This is essential for the sake of backward
        compatibility.

        The problem is the slave thread is running under "special" user (@),
        that actually does not exist. In the older versions we do not fail
        execution of a stored routine if its definer does not exist and
        continue the execution under the authorization of the invoker
        (BUG#13198). And now if we try to switch to slave-current-user (@),
        we will fail.

        Actually, this leads to the inconsistent state of master and
        slave (different definers, different SUID behaviour), but it seems,
        this is the best we can do.
  */

  if (!lex->definer)
  {
    Query_arena original_arena;
    Query_arena *ps_arena= thd->activate_stmt_arena_if_needed(&original_arena);

    lex->definer= create_default_definer(thd);

    if (ps_arena)
      thd->restore_active_arena(ps_arena, &original_arena);

    /* Error has been already reported. */
    if (lex->definer == NULL)
      DBUG_RETURN(TRUE);

1940
    if (thd->slave_thread && lex->sphead)
1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978
      lex->sphead->m_chistics->suid= SP_IS_NOT_SUID;
  }
  else
  {
    /*
      If the specified definer differs from the current user, we
      should check that the current user has SUPER privilege (in order
      to create a stored routine under another user one must have
      SUPER privilege).
    */
    if ((strcmp(lex->definer->user.str, thd->security_ctx->priv_user) ||
         my_strcasecmp(system_charset_info, lex->definer->host.str,
                       thd->security_ctx->priv_host)) &&
        check_global_access(thd, SUPER_ACL))
    {
      my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), "SUPER");
      DBUG_RETURN(TRUE);
    }
  }

  /* Check that the specified definer exists. Emit a warning if not. */

#ifndef NO_EMBEDDED_ACCESS_CHECKS
  if (!is_acl_user(lex->definer->host.str, lex->definer->user.str))
  {
    push_warning_printf(thd,
                        MYSQL_ERROR::WARN_LEVEL_NOTE,
                        ER_NO_SUCH_USER,
                        ER(ER_NO_SUCH_USER),
                        lex->definer->user.str,
                        lex->definer->host.str);
  }
#endif /* NO_EMBEDDED_ACCESS_CHECKS */

  DBUG_RETURN(FALSE);
}


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/**
  Execute command saved in thd and lex->sql_command.
1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991

    Before every operation that can request a write lock for a table
    wait if a global read lock exists. However do not wait if this
    thread has locked tables already. No new locks can be requested
    until the other locks are released. The thread that requests the
    global read lock waits for write locked tables to become unlocked.

    Note that wait_if_global_read_lock() sets a protection against a new
    global read lock when it succeeds. This needs to be released by
    start_waiting_global_read_lock() after the operation.

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1992 1993 1994 1995 1996 1997 1998 1999 2000 2001
  @param thd                       Thread handle

  @todo
    - Invalidate the table in the query cache if something changed
    after unlocking when changes become visible.
    TODO: this is workaround. right way will be move invalidating in
    the unlock procedure.
    - TODO: use check_change_password()

  @retval
2002
    FALSE       OK
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2003
  @retval
2004 2005
    TRUE        Error
*/
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2007
int
2008
mysql_execute_command(THD *thd)
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{
2010
  int res= FALSE;
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  int  up_result= 0;
2012
  LEX  *lex= thd->lex;
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  /* first SELECT_LEX (have special meaning for many of non-SELECTcommands) */
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  SELECT_LEX *select_lex= &lex->select_lex;
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2015
  /* first table of first SELECT_LEX */
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  TABLE_LIST *first_table= (TABLE_LIST*) select_lex->table_list.first;
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2017 2018 2019
  /* list of all tables in query */
  TABLE_LIST *all_tables;
  /* most outer SELECT_LEX_UNIT of query */
2020
  SELECT_LEX_UNIT *unit= &lex->unit;
2021 2022 2023 2024
#ifdef HAVE_REPLICATION
  /* have table map for update for multi-update statement (BUG#37051) */
  bool have_table_map_for_update= FALSE;
#endif
2025
  /* Saved variable value */
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  DBUG_ENTER("mysql_execute_command");
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#ifdef WITH_PARTITION_STORAGE_ENGINE
  thd->work_part_info= 0;
#endif
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  /*
    In many cases first table of main SELECT_LEX have special meaning =>
    check that it is first table in global list and relink it first in 
    queries_tables list if it is necessary (we need such relinking only
    for queries with subqueries in select list, in this case tables of
    subqueries will go to global list first)

    all_tables will differ from first_table only if most upper SELECT_LEX
    do not contain tables.

    Because of above in place where should be at least one table in most
    outer SELECT_LEX we have following check:
    DBUG_ASSERT(first_table == all_tables);
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
  */
  lex->first_lists_tables_same();
2047
  /* should be assigned after making first tables same */
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  all_tables= lex->query_tables;
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  /* set context for commands which do not use setup_tables */
  select_lex->
    context.resolve_in_table_list_only((TABLE_LIST*)select_lex->
                                       table_list.first);
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2053

2054 2055 2056 2057 2058 2059
  /*
    Reset warning count for each query that uses tables
    A better approach would be to reset this for any commands
    that is not a SHOW command or a select that only access local
    variables, but for now this is probably good enough.
  */
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2060 2061 2062 2063 2064 2065 2066 2067
  if ((sql_command_flags[lex->sql_command] & CF_DIAGNOSTIC_STMT) != 0)
    thd->warning_info->set_read_only(TRUE);
  else
  {
    thd->warning_info->set_read_only(FALSE);
    if (all_tables)
      thd->warning_info->opt_clear_warning_info(thd->query_id);
  }
2068

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2069
#ifdef HAVE_REPLICATION
2070
  if (unlikely(thd->slave_thread))
2071
  {
2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094
    if (lex->sql_command == SQLCOM_DROP_TRIGGER)
    {
      /*
        When dropping a trigger, we need to load its table name
        before checking slave filter rules.
      */
      add_table_for_trigger(thd, thd->lex->spname, 1, &all_tables);
      
      if (!all_tables)
      {
        /*
          If table name cannot be loaded,
          it means the trigger does not exists possibly because
          CREATE TRIGGER was previously skipped for this trigger
          according to slave filtering rules.
          Returning success without producing any errors in this case.
        */
        DBUG_RETURN(0);
      }
      
      // force searching in slave.cc:tables_ok() 
      all_tables->updating= 1;
    }
2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136

    /*
      For fix of BUG#37051, the master stores the table map for update
      in the Query_log_event, and the value is assigned to
      thd->variables.table_map_for_update before executing the update
      query.

      If thd->variables.table_map_for_update is set, then we are
      replicating from a new master, we can use this value to apply
      filter rules without opening all the tables. However If
      thd->variables.table_map_for_update is not set, then we are
      replicating from an old master, so we just skip this and
      continue with the old method. And of course, the bug would still
      exist for old masters.
    */
    if (lex->sql_command == SQLCOM_UPDATE_MULTI &&
        thd->table_map_for_update)
    {
      have_table_map_for_update= TRUE;
      table_map table_map_for_update= thd->table_map_for_update;
      uint nr= 0;
      TABLE_LIST *table;
      for (table=all_tables; table; table=table->next_global, nr++)
      {
        if (table_map_for_update & ((table_map)1 << nr))
          table->updating= TRUE;
        else
          table->updating= FALSE;
      }

      if (all_tables_not_ok(thd, all_tables))
      {
        /* we warn the slave SQL thread */
        my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
        if (thd->one_shot_set)
          reset_one_shot_variables(thd);
        DBUG_RETURN(0);
      }
      
      for (table=all_tables; table; table=table->next_global)
        table->updating= TRUE;
    }
2137
    
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2138
    /*
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      Check if statment should be skipped because of slave filtering
      rules
2141 2142

      Exceptions are:
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2143 2144
      - UPDATE MULTI: For this statement, we want to check the filtering
        rules later in the code
2145
      - SET: we always execute it (Not that many SET commands exists in
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2146 2147
        the binary log anyway -- only 4.1 masters write SET statements,
	in 5.0 there are no SET statements in the binary log)
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      - DROP TEMPORARY TABLE IF EXISTS: we always execute it (otherwise we
        have stale files on slave caused by exclusion of one tmp table).
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2150
    */
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2151 2152
    if (!(lex->sql_command == SQLCOM_UPDATE_MULTI) &&
	!(lex->sql_command == SQLCOM_SET_OPTION) &&
2153
	!(lex->sql_command == SQLCOM_DROP_TABLE &&
2154
          lex->drop_temporary && lex->drop_if_exists) &&
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2155
        all_tables_not_ok(thd, all_tables))
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2156 2157
    {
      /* we warn the slave SQL thread */
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      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175
      if (thd->one_shot_set)
      {
        /*
          It's ok to check thd->one_shot_set here:

          The charsets in a MySQL 5.0 slave can change by both a binlogged
          SET ONE_SHOT statement and the event-internal charset setting, 
          and these two ways to change charsets do not seems to work
          together.

          At least there seems to be problems in the rli cache for
          charsets if we are using ONE_SHOT.  Note that this is normally no
          problem because either the >= 5.0 slave reads a 4.1 binlog (with
          ONE_SHOT) *or* or 5.0 binlog (without ONE_SHOT) but never both."
        */
        reset_one_shot_variables(thd);
      }
2176
      DBUG_RETURN(0);
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2177
    }
2178
  }
2179
  else
2180
  {
2181
#endif /* HAVE_REPLICATION */
2182 2183 2184 2185
    /*
      When option readonly is set deny operations which change non-temporary
      tables. Except for the replication thread and the 'super' users.
    */
2186
    if (deny_updates_if_read_only_option(thd, all_tables))
2187 2188 2189 2190 2191 2192 2193
    {
      my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
      DBUG_RETURN(-1);
    }
#ifdef HAVE_REPLICATION
  } /* endif unlikely slave */
#endif
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2194

2195
  status_var_increment(thd->status_var.com_stat[lex->sql_command]);
2196

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2197
  DBUG_ASSERT(thd->transaction.stmt.modified_non_trans_table == FALSE);
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2198 2199 2200 2201 2202 2203 2204

  /*
    End a active transaction so that this command will have it's
    own transaction and will also sync the binary log. If a DDL is
    not run in it's own transaction it may simply never appear on
    the slave in case the outside transaction rolls back.
  */
2205 2206 2207 2208 2209 2210 2211 2212 2213
  if (stmt_causes_implicit_commit(thd, CF_IMPLICT_COMMIT_BEGIN))
  {
    /* Commit or rollback the statement transaction. */
    thd->is_error() ? trans_rollback_stmt(thd) : trans_commit_stmt(thd);
    /* Commit the normal transaction if one is active. */
    if (trans_commit_implicit(thd))
      goto error;
    /* Close tables and release metadata locks. */
    close_thread_tables(thd);
2214
    thd->mdl_context.release_transactional_locks();
2215
  }
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2216

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2217 2218 2219 2220 2221 2222 2223 2224
  /*
    Check if this command needs protection against the global read lock
    to avoid deadlock. See CF_PROTECT_AGAINST_GRL.
    start_waiting_global_read_lock() is called at the end of
    mysql_execute_command().
  */
  if (((sql_command_flags[lex->sql_command] & CF_PROTECT_AGAINST_GRL) != 0) &&
      !thd->locked_tables_mode)
2225
    if (thd->global_read_lock.wait_if_global_read_lock(thd, FALSE, TRUE))
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2226 2227
      goto error;

2228 2229 2230 2231 2232
#ifndef DBUG_OFF
  if (lex->sql_command != SQLCOM_SET_OPTION)
    DEBUG_SYNC(thd,"before_execute_sql_command");
#endif

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2233
  switch (lex->sql_command) {
2234

2235
  case SQLCOM_SHOW_EVENTS:
2236 2237 2238 2239
#ifndef HAVE_EVENT_SCHEDULER
    my_error(ER_NOT_SUPPORTED_YET, MYF(0), "embedded server");
    break;
#endif
2240 2241
  case SQLCOM_SHOW_STATUS_PROC:
  case SQLCOM_SHOW_STATUS_FUNC:
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2242
    if ((res= check_table_access(thd, SELECT_ACL, all_tables, FALSE,
2243
                                  UINT_MAX, FALSE)))
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2244 2245
      goto error;
    res= execute_sqlcom_select(thd, all_tables);
2246 2247 2248 2249 2250
    break;
  case SQLCOM_SHOW_STATUS:
  {
    system_status_var old_status_var= thd->status_var;
    thd->initial_status_var= &old_status_var;
2251 2252
    if (!(res= check_table_access(thd, SELECT_ACL, all_tables, FALSE,
                                  UINT_MAX, FALSE)))
2253
      res= execute_sqlcom_select(thd, all_tables);
2254 2255 2256 2257 2258 2259 2260
    /* Don't log SHOW STATUS commands to slow query log */
    thd->server_status&= ~(SERVER_QUERY_NO_INDEX_USED |
                           SERVER_QUERY_NO_GOOD_INDEX_USED);
    /*
      restore status variables, as we don't want 'show status' to cause
      changes
    */
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2261
    mysql_mutex_lock(&LOCK_status);
2262 2263 2264
    add_diff_to_status(&global_status_var, &thd->status_var,
                       &old_status_var);
    thd->status_var= old_status_var;
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2265
    mysql_mutex_unlock(&LOCK_status);
2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278
    break;
  }
  case SQLCOM_SHOW_DATABASES:
  case SQLCOM_SHOW_TABLES:
  case SQLCOM_SHOW_TRIGGERS:
  case SQLCOM_SHOW_TABLE_STATUS:
  case SQLCOM_SHOW_OPEN_TABLES:
  case SQLCOM_SHOW_PLUGINS:
  case SQLCOM_SHOW_FIELDS:
  case SQLCOM_SHOW_KEYS:
  case SQLCOM_SHOW_VARIABLES:
  case SQLCOM_SHOW_CHARSETS:
  case SQLCOM_SHOW_COLLATIONS:
2279
  case SQLCOM_SHOW_STORAGE_ENGINES:
2280
  case SQLCOM_SHOW_PROFILE:
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2281
  case SQLCOM_SELECT:
2282
  {
2283
    thd->status_var.last_query_cost= 0.0;
2284 2285 2286 2287 2288 2289 2290 2291

    /*
      lex->exchange != NULL implies SELECT .. INTO OUTFILE and this
      requires FILE_ACL access.
    */
    ulong privileges_requested= lex->exchange ? SELECT_ACL | FILE_ACL :
      SELECT_ACL;

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2292
    if (all_tables)
2293
      res= check_table_access(thd,
2294 2295
                              privileges_requested,
                              all_tables, FALSE, UINT_MAX, FALSE);
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2296
    else
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2297
      res= check_access(thd, privileges_requested, any_db, NULL, NULL, 0, 0);
2298

2299 2300 2301
    if (res)
      break;

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2302
    if (!thd->locked_tables_mode && lex->protect_against_global_read_lock &&
2303
        thd->global_read_lock.wait_if_global_read_lock(thd, FALSE, TRUE))
2304 2305 2306
      break;

    res= execute_sqlcom_select(thd, all_tables);
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2307
    break;
2308 2309
  }
case SQLCOM_PREPARE:
2310
  {
2311
    mysql_sql_stmt_prepare(thd);
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2312 2313 2314 2315
    break;
  }
  case SQLCOM_EXECUTE:
  {
2316
    mysql_sql_stmt_execute(thd);
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2317 2318 2319 2320
    break;
  }
  case SQLCOM_DEALLOCATE_PREPARE:
  {
2321
    mysql_sql_stmt_close(thd);
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2322 2323
    break;
  }
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2324
  case SQLCOM_DO:
2325
    if (check_table_access(thd, SELECT_ACL, all_tables, FALSE, UINT_MAX, FALSE)
2326
        || open_and_lock_tables(thd, all_tables, TRUE, 0))
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2327
      goto error;
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2328 2329

    res= mysql_do(thd, *lex->insert_list);
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2330 2331
    break;

2332
  case SQLCOM_EMPTY_QUERY:
2333
    my_ok(thd);
2334 2335
    break;

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2336 2337 2338 2339
  case SQLCOM_HELP:
    res= mysqld_help(thd,lex->help_arg);
    break;

2340
#ifndef EMBEDDED_LIBRARY
unknown's avatar
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2341
  case SQLCOM_PURGE:
2342
  {
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2343
    if (check_global_access(thd, SUPER_ACL))
2344
      goto error;
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2345
    /* PURGE MASTER LOGS TO 'file' */
2346 2347 2348
    res = purge_master_logs(thd, lex->to_log);
    break;
  }
2349 2350
  case SQLCOM_PURGE_BEFORE:
  {
2351 2352
    Item *it;

2353 2354
    if (check_global_access(thd, SUPER_ACL))
      goto error;
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2355
    /* PURGE MASTER LOGS BEFORE 'data' */
2356
    it= (Item *)lex->value_list.head();
2357
    if ((!it->fixed && it->fix_fields(lex->thd, &it)) ||
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2358
        it->check_cols(1))
2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369
    {
      my_error(ER_WRONG_ARGUMENTS, MYF(0), "PURGE LOGS BEFORE");
      goto error;
    }
    it= new Item_func_unix_timestamp(it);
    /*
      it is OK only emulate fix_fieds, because we need only
      value of constant
    */
    it->quick_fix_field();
    res = purge_master_logs_before_date(thd, (ulong)it->val_int());
2370 2371
    break;
  }
2372
#endif
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2373 2374
  case SQLCOM_SHOW_WARNS:
  {
2375 2376
    res= mysqld_show_warnings(thd, (ulong)
			      ((1L << (uint) MYSQL_ERROR::WARN_LEVEL_NOTE) |
2377 2378 2379
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_WARN) |
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR)
			       ));
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2380 2381 2382 2383
    break;
  }
  case SQLCOM_SHOW_ERRORS:
  {
2384 2385
    res= mysqld_show_warnings(thd, (ulong)
			      (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR));
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2386 2387
    break;
  }
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2388 2389
  case SQLCOM_SHOW_PROFILES:
  {
2390
#if defined(ENABLED_PROFILING)
2391
    thd->profiling.discard_current_query();
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2392
    res= thd->profiling.show_profiles();
2393 2394 2395
    if (res)
      goto error;
#else
2396
    my_error(ER_FEATURE_DISABLED, MYF(0), "SHOW PROFILES", "enable-profiling");
2397 2398
    goto error;
#endif
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2399 2400
    break;
  }
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2401 2402
  case SQLCOM_SHOW_NEW_MASTER:
  {
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2403
    if (check_global_access(thd, REPL_SLAVE_ACL))
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2404
      goto error;
2405
    /* This query don't work now. See comment in repl_failsafe.cc */
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2406
#ifndef WORKING_NEW_MASTER
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2407 2408
    my_error(ER_NOT_SUPPORTED_YET, MYF(0), "SHOW NEW MASTER");
    goto error;
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2409
#else
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2410 2411
    res = show_new_master(thd);
    break;
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2412
#endif
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2413
  }
2414

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2415
#ifdef HAVE_REPLICATION
2416 2417
  case SQLCOM_SHOW_SLAVE_HOSTS:
  {
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2418
    if (check_global_access(thd, REPL_SLAVE_ACL))
2419 2420 2421 2422
      goto error;
    res = show_slave_hosts(thd);
    break;
  }
2423
  case SQLCOM_SHOW_RELAYLOG_EVENTS: /* fall through */
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2424 2425
  case SQLCOM_SHOW_BINLOG_EVENTS:
  {
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2426
    if (check_global_access(thd, REPL_SLAVE_ACL))
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2427
      goto error;
2428
    res = mysql_show_binlog_events(thd);
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2429 2430
    break;
  }
2431 2432
#endif

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2433 2434
  case SQLCOM_ASSIGN_TO_KEYCACHE:
  {
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VIEW  
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2435
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
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2436
    if (check_access(thd, INDEX_ACL, first_table->db,
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Marc Alff committed
2437 2438 2439
                     &first_table->grant.privilege,
                     &first_table->grant.m_internal,
                     0, 0))
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2440
      goto error;
2441
    res= mysql_assign_to_keycache(thd, first_table, &lex->ident);
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2442 2443
    break;
  }
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2444 2445
  case SQLCOM_PRELOAD_KEYS:
  {
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VIEW  
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2446
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
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2447
    if (check_access(thd, INDEX_ACL, first_table->db,
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2448 2449 2450
                     &first_table->grant.privilege,
                     &first_table->grant.m_internal,
                     0, 0))
2451
      goto error;
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VIEW  
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2452
    res = mysql_preload_keys(thd, first_table);
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2453 2454
    break;
  }
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2455
#ifdef HAVE_REPLICATION
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2456
  case SQLCOM_CHANGE_MASTER:
2457
  {
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2458
    if (check_global_access(thd, SUPER_ACL))
2459
      goto error;
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Marc Alff committed
2460
    mysql_mutex_lock(&LOCK_active_mi);
2461
    res = change_master(thd,active_mi);
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2462
    mysql_mutex_unlock(&LOCK_active_mi);
2463 2464
    break;
  }
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2465
  case SQLCOM_SHOW_SLAVE_STAT:
2466
  {
2467 2468
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2469
      goto error;
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Marc Alff committed
2470
    mysql_mutex_lock(&LOCK_active_mi);
2471 2472 2473 2474 2475 2476
    if (active_mi != NULL)
    {
      res = show_master_info(thd, active_mi);
    }
    else
    {
2477 2478
      push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                   WARN_NO_MASTER_INFO, ER(WARN_NO_MASTER_INFO));
2479
      my_ok(thd);
2480
    }
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2481
    mysql_mutex_unlock(&LOCK_active_mi);
2482 2483
    break;
  }
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2484
  case SQLCOM_SHOW_MASTER_STAT:
2485
  {
2486 2487
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2488 2489 2490 2491
      goto error;
    res = show_binlog_info(thd);
    break;
  }
unknown's avatar
unknown committed
2492

unknown's avatar
unknown committed
2493
#endif /* HAVE_REPLICATION */
unknown's avatar
unknown committed
2494
  case SQLCOM_SHOW_ENGINE_STATUS:
unknown's avatar
unknown committed
2495
    {
2496
      if (check_global_access(thd, PROCESS_ACL))
unknown's avatar
unknown committed
2497 2498
        goto error;
      res = ha_show_status(thd, lex->create_info.db_type, HA_ENGINE_STATUS);
unknown's avatar
unknown committed
2499 2500
      break;
    }
unknown's avatar
unknown committed
2501
  case SQLCOM_SHOW_ENGINE_MUTEX:
unknown's avatar
unknown committed
2502
    {
2503
      if (check_global_access(thd, PROCESS_ACL))
unknown's avatar
unknown committed
2504
        goto error;
unknown's avatar
unknown committed
2505
      res = ha_show_status(thd, lex->create_info.db_type, HA_ENGINE_MUTEX);
unknown's avatar
unknown committed
2506 2507
      break;
    }
unknown's avatar
unknown committed
2508
  case SQLCOM_CREATE_TABLE:
unknown's avatar
unknown committed
2509
  {
unknown's avatar
VIEW  
unknown committed
2510 2511
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    bool link_to_local;
2512 2513 2514
    TABLE_LIST *create_table= first_table;
    TABLE_LIST *select_tables= lex->create_last_non_select_table->next_global;

2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535
    /*
      Code below (especially in mysql_create_table() and select_create
      methods) may modify HA_CREATE_INFO structure in LEX, so we have to
      use a copy of this structure to make execution prepared statement-
      safe. A shallow copy is enough as this code won't modify any memory
      referenced from this structure.
    */
    HA_CREATE_INFO create_info(lex->create_info);
    /*
      We need to copy alter_info for the same reasons of re-execution
      safety, only in case of Alter_info we have to do (almost) a deep
      copy.
    */
    Alter_info alter_info(lex->alter_info, thd->mem_root);

    if (thd->is_fatal_error)
    {
      /* If out of memory when creating a copy of alter_info. */
      res= 1;
      goto end_with_restore_list;
    }
unknown's avatar
unknown committed
2536

unknown's avatar
VIEW  
unknown committed
2537
    if ((res= create_table_precheck(thd, select_tables, create_table)))
unknown's avatar
unknown committed
2538
      goto end_with_restore_list;
unknown's avatar
unknown committed
2539

2540 2541 2542
    /* Might have been updated in create_table_precheck */
    create_info.alias= create_table->alias;

2543
#ifdef HAVE_READLINK
2544
    /* Fix names if symlinked tables */
2545
    if (append_file_to_dir(thd, &create_info.data_file_name,
2546
			   create_table->table_name) ||
2547
	append_file_to_dir(thd, &create_info.index_file_name,
2548
			   create_table->table_name))
unknown's avatar
unknown committed
2549
      goto end_with_restore_list;
2550
#endif
2551
    /*
2552
      If we are using SET CHARSET without DEFAULT, add an implicit
2553 2554
      DEFAULT to not confuse old users. (This may change).
    */
2555
    if ((create_info.used_fields &
2556 2557 2558
	 (HA_CREATE_USED_DEFAULT_CHARSET | HA_CREATE_USED_CHARSET)) ==
	HA_CREATE_USED_CHARSET)
    {
2559 2560 2561 2562
      create_info.used_fields&= ~HA_CREATE_USED_CHARSET;
      create_info.used_fields|= HA_CREATE_USED_DEFAULT_CHARSET;
      create_info.default_table_charset= create_info.table_charset;
      create_info.table_charset= 0;
2563
    }
2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574
    /*
      The create-select command will open and read-lock the select table
      and then create, open and write-lock the new table. If a global
      read lock steps in, we get a deadlock. The write lock waits for
      the global read lock, while the global read lock waits for the
      select table to be closed. So we wait until the global readlock is
      gone before starting both steps. Note that
      wait_if_global_read_lock() sets a protection against a new global
      read lock when it succeeds. This needs to be released by
      start_waiting_global_read_lock(). We protect the normal CREATE
      TABLE in the same way. That way we avoid that a new table is
2575
      created during a global read lock.
Jon Olav Hauglid's avatar
Jon Olav Hauglid committed
2576
      Protection against grl is covered by the CF_PROTECT_AGAINST_GRL flag.
2577
    */
Jon Olav Hauglid's avatar
Jon Olav Hauglid committed
2578

2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589
#ifdef WITH_PARTITION_STORAGE_ENGINE
    {
      partition_info *part_info= thd->lex->part_info;
      if (part_info && !(part_info= thd->lex->part_info->get_clone()))
      {
        res= -1;
        goto end_with_restore_list;
      }
      thd->work_part_info= part_info;
    }
#endif
2590

2591 2592
    /* Set strategies: reset default or 'prepared' values. */
    create_table->open_strategy= TABLE_LIST::OPEN_IF_EXISTS;
2593
    create_table->lock_strategy= TABLE_LIST::OTLS_DOWNGRADE_IF_EXISTS;
2594

2595 2596 2597 2598 2599
    /*
      Close any open handlers for the table
    */
    mysql_ha_rm_tables(thd, create_table);

2600
    if (select_lex->item_list.elements)		// With select
unknown's avatar
unknown committed
2601 2602
    {
      select_result *result;
2603

2604 2605 2606
      /*
        If:
        a) we inside an SP and there was NAME_CONST substitution,
Ramil Kalimullin's avatar
Ramil Kalimullin committed
2607
        b) binlogging is on (STMT mode),
2608 2609 2610 2611 2612 2613
        c) we log the SP as separate statements
        raise a warning, as it may cause problems
        (see 'NAME_CONST issues' in 'Binary Logging of Stored Programs')
       */
      if (thd->query_name_consts && 
          mysql_bin_log.is_open() &&
Ramil Kalimullin's avatar
Ramil Kalimullin committed
2614
          thd->variables.binlog_format == BINLOG_FORMAT_STMT &&
2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640
          !mysql_bin_log.is_query_in_union(thd, thd->query_id))
      {
        List_iterator_fast<Item> it(select_lex->item_list);
        Item *item;
        uint splocal_refs= 0;
        /* Count SP local vars in the top-level SELECT list */
        while ((item= it++))
        {
          if (item->is_splocal())
            splocal_refs++;
        }
        /*
          If it differs from number of NAME_CONST substitution applied,
          we may have a SOME_FUNC(NAME_CONST()) in the SELECT list,
          that may cause a problem with binary log (see BUG#35383),
          raise a warning. 
        */
        if (splocal_refs != thd->query_name_consts)
          push_warning(thd, 
                       MYSQL_ERROR::WARN_LEVEL_WARN,
                       ER_UNKNOWN_ERROR,
"Invoked routine ran a statement that may cause problems with "
"binary log, see 'NAME_CONST issues' in 'Binary Logging of Stored Programs' "
"section of the manual.");
      }
      
2641
      select_lex->options|= SELECT_NO_UNLOCK;
2642
      unit->set_limit(select_lex);
2643

2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656
      /*
        Disable non-empty MERGE tables with CREATE...SELECT. Too
        complicated. See Bug #26379. Empty MERGE tables are read-only
        and don't allow CREATE...SELECT anyway.
      */
      if (create_info.used_fields & HA_CREATE_USED_UNION)
      {
        my_error(ER_WRONG_OBJECT, MYF(0), create_table->db,
                 create_table->table_name, "BASE TABLE");
        res= 1;
        goto end_with_restore_list;
      }

2657
      if (!(create_info.options & HA_LEX_CREATE_TMP_TABLE))
unknown's avatar
unknown committed
2658
      {
2659
        /* Base table and temporary table are not in the same name space. */
2660
        create_table->open_type= OT_BASE_ONLY;
unknown's avatar
unknown committed
2661 2662
      }

2663
      if (!(res= open_and_lock_tables(thd, lex->query_tables, TRUE, 0)))
2664
      {
2665 2666 2667 2668
        /*
          Is table which we are changing used somewhere in other parts
          of query
        */
2669
        if (!(create_info.options & HA_LEX_CREATE_TMP_TABLE))
2670
        {
2671
          TABLE_LIST *duplicate;
2672
          if ((duplicate= unique_table(thd, create_table, select_tables, 0)))
2673 2674 2675
          {
            update_non_unique_table_error(create_table, "CREATE", duplicate);
            res= 1;
2676
            goto end_with_restore_list;
2677
          }
2678
        }
unknown's avatar
unknown committed
2679
        /* If we create merge table, we have to test tables in merge, too */
2680
        if (create_info.used_fields & HA_CREATE_USED_UNION)
unknown's avatar
unknown committed
2681 2682
        {
          TABLE_LIST *tab;
2683
          for (tab= (TABLE_LIST*) create_info.merge_list.first;
unknown's avatar
unknown committed
2684 2685 2686
               tab;
               tab= tab->next_local)
          {
2687
            TABLE_LIST *duplicate;
2688
            if ((duplicate= unique_table(thd, tab, select_tables, 0)))
unknown's avatar
unknown committed
2689
            {
2690
              update_non_unique_table_error(tab, "CREATE", duplicate);
unknown's avatar
unknown committed
2691
              res= 1;
2692
              goto end_with_restore_list;
unknown's avatar
unknown committed
2693 2694 2695
            }
          }
        }
2696

2697 2698 2699 2700 2701 2702 2703
        /*
          Remove target table from main select and name resolution
          context. This can't be done earlier as it will break view merging in
          statements like "CREATE TABLE IF NOT EXISTS existing_view SELECT".
        */
        lex->unlink_first_table(&link_to_local);

2704 2705 2706 2707
        /* So that CREATE TEMPORARY TABLE gets to binlog at commit/rollback */
        if (create_info.options & HA_LEX_CREATE_TMP_TABLE)
          thd->variables.option_bits|= OPTION_KEEP_LOG;

unknown's avatar
unknown committed
2708
        /*
2709 2710
          select_create is currently not re-execution friendly and
          needs to be created for every execution of a PS/SP.
unknown's avatar
unknown committed
2711
        */
unknown's avatar
VIEW  
unknown committed
2712
        if ((result= new select_create(create_table,
2713 2714 2715 2716
                                       &create_info,
                                       &alter_info,
                                       select_lex->item_list,
                                       lex->duplicates,
2717
                                       lex->ignore,
2718
                                       select_tables)))
2719 2720 2721 2722 2723
        {
          /*
            CREATE from SELECT give its SELECT_LEX for SELECT,
            and item_list belong to SELECT
          */
2724
          res= handle_select(thd, lex, result, 0);
2725
          delete result;
2726
        }
2727 2728
        
        lex->link_first_table_back(create_table, link_to_local);
2729 2730
      }
    }
unknown's avatar
unknown committed
2731
    else
unknown's avatar
unknown committed
2732
    {
2733
      /* So that CREATE TEMPORARY TABLE gets to binlog at commit/rollback */
2734
      if (create_info.options & HA_LEX_CREATE_TMP_TABLE)
2735
        thd->variables.option_bits|= OPTION_KEEP_LOG;
unknown's avatar
unknown committed
2736
      /* regular create */
2737
      if (create_info.options & HA_LEX_CREATE_TABLE_LIKE)
2738 2739
      {
        /* CREATE TABLE ... LIKE ... */
unknown's avatar
unknown committed
2740
        res= mysql_create_like_table(thd, create_table, select_tables,
2741
                                     &create_info);
2742
      }
unknown's avatar
unknown committed
2743
      else
2744
      {
2745 2746 2747
        /* Regular CREATE TABLE */
        res= mysql_create_table(thd, create_table,
                                &create_info, &alter_info);
2748
      }
unknown's avatar
unknown committed
2749
      if (!res)
2750
        my_ok(thd);
unknown's avatar
unknown committed
2751
    }
2752

unknown's avatar
unknown committed
2753
end_with_restore_list:
unknown's avatar
unknown committed
2754
    break;
unknown's avatar
unknown committed
2755
  }
unknown's avatar
unknown committed
2756
  case SQLCOM_CREATE_INDEX:
2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774
    /* Fall through */
  case SQLCOM_DROP_INDEX:
  /*
    CREATE INDEX and DROP INDEX are implemented by calling ALTER
    TABLE with proper arguments.

    In the future ALTER TABLE will notice that the request is to
    only add indexes and create these one by one for the existing
    table without having to do a full rebuild.
  */
  {
    /* Prepare stack copies to be re-execution safe */
    HA_CREATE_INFO create_info;
    Alter_info alter_info(lex->alter_info, thd->mem_root);

    if (thd->is_fatal_error) /* out of memory creating a copy of alter_info */
      goto error;

unknown's avatar
VIEW  
unknown committed
2775 2776
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_one_table_access(thd, INDEX_ACL, all_tables))
unknown's avatar
unknown committed
2777
      goto error; /* purecov: inspected */
2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788
    /*
      Currently CREATE INDEX or DROP INDEX cause a full table rebuild
      and thus classify as slow administrative statements just like
      ALTER TABLE.
    */
    thd->enable_slow_log= opt_log_slow_admin_statements;

    bzero((char*) &create_info, sizeof(create_info));
    create_info.db_type= 0;
    create_info.row_type= ROW_TYPE_NOT_USED;
    create_info.default_table_charset= thd->variables.collation_database;
unknown's avatar
unknown committed
2789

2790 2791 2792 2793 2794
    res= mysql_alter_table(thd, first_table->db, first_table->table_name,
                           &create_info, first_table, &alter_info,
                           0, (ORDER*) 0, 0);
    break;
  }
unknown's avatar
unknown committed
2795
#ifdef HAVE_REPLICATION
unknown's avatar
unknown committed
2796
  case SQLCOM_SLAVE_START:
2797
  {
Marc Alff's avatar
Marc Alff committed
2798
    mysql_mutex_lock(&LOCK_active_mi);
2799
    start_slave(thd,active_mi,1 /* net report*/);
Marc Alff's avatar
Marc Alff committed
2800
    mysql_mutex_unlock(&LOCK_active_mi);
unknown's avatar
unknown committed
2801
    break;
2802
  }
unknown's avatar
unknown committed
2803
  case SQLCOM_SLAVE_STOP:
2804 2805 2806 2807 2808 2809
  /*
    If the client thread has locked tables, a deadlock is possible.
    Assume that
    - the client thread does LOCK TABLE t READ.
    - then the master updates t.
    - then the SQL slave thread wants to update t,
2810
      so it waits for the client thread because t is locked by it.
2811
    - then the client thread does SLAVE STOP.
2812 2813
      SLAVE STOP waits for the SQL slave thread to terminate its
      update t, which waits for the client thread because t is locked by it.
2814 2815 2816
    To prevent that, refuse SLAVE STOP if the
    client thread has locked tables
  */
Konstantin Osipov's avatar
Konstantin Osipov committed
2817
  if (thd->locked_tables_mode ||
2818
      thd->in_active_multi_stmt_transaction() || thd->global_read_lock.is_acquired())
2819
  {
2820 2821
    my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
               ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
2822
    goto error;
2823
  }
2824
  {
Marc Alff's avatar
Marc Alff committed
2825
    mysql_mutex_lock(&LOCK_active_mi);
2826
    stop_slave(thd,active_mi,1/* net report*/);
Marc Alff's avatar
Marc Alff committed
2827
    mysql_mutex_unlock(&LOCK_active_mi);
unknown's avatar
unknown committed
2828
    break;
2829
  }
unknown's avatar
unknown committed
2830
#endif /* HAVE_REPLICATION */
2831

unknown's avatar
unknown committed
2832
  case SQLCOM_ALTER_TABLE:
unknown's avatar
VIEW  
unknown committed
2833
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
2834
    {
unknown's avatar
unknown committed
2835
      ulong priv=0;
unknown's avatar
unknown committed
2836
      ulong priv_needed= ALTER_ACL;
2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847
      /*
        Code in mysql_alter_table() may modify its HA_CREATE_INFO argument,
        so we have to use a copy of this structure to make execution
        prepared statement- safe. A shallow copy is enough as no memory
        referenced from this structure will be modified.
      */
      HA_CREATE_INFO create_info(lex->create_info);
      Alter_info alter_info(lex->alter_info, thd->mem_root);

      if (thd->is_fatal_error) /* out of memory creating a copy of alter_info */
        goto error;
2848 2849 2850 2851
      /*
        We also require DROP priv for ALTER TABLE ... DROP PARTITION, as well
        as for RENAME TO, as being done by SQLCOM_RENAME_TABLE
      */
2852
      if (alter_info.flags & (ALTER_DROP_PARTITION | ALTER_RENAME))
unknown's avatar
unknown committed
2853 2854
        priv_needed|= DROP_ACL;

unknown's avatar
unknown committed
2855 2856
      /* Must be set in the parser */
      DBUG_ASSERT(select_lex->db);
unknown's avatar
unknown committed
2857
      if (check_access(thd, priv_needed, first_table->db,
Marc Alff's avatar
Marc Alff committed
2858 2859 2860 2861 2862 2863 2864
                       &first_table->grant.privilege,
                       &first_table->grant.m_internal,
                       0, 0) ||
          check_access(thd, INSERT_ACL | CREATE_ACL, select_lex->db,
                       &priv,
                       NULL, /* Do not use first_table->grant with select_lex->db */
                       0, 0) ||
unknown's avatar
VIEW  
unknown committed
2865
	  check_merge_table_access(thd, first_table->db,
2866
				   (TABLE_LIST *)
2867
				   create_info.merge_list.first))
2868
	goto error;				/* purecov: inspected */
2869
      if (check_grant(thd, priv_needed, all_tables, FALSE, UINT_MAX, FALSE))
2870 2871 2872 2873 2874 2875 2876 2877
        goto error;
      if (lex->name.str && !test_all_bits(priv,INSERT_ACL | CREATE_ACL))
      { // Rename of table
          TABLE_LIST tmp_table;
          bzero((char*) &tmp_table,sizeof(tmp_table));
          tmp_table.table_name= lex->name.str;
          tmp_table.db=select_lex->db;
          tmp_table.grant.privilege=priv;
2878 2879
          if (check_grant(thd, INSERT_ACL | CREATE_ACL, &tmp_table, FALSE,
              UINT_MAX, FALSE))
2880
            goto error;
unknown's avatar
unknown committed
2881
      }
2882

2883
      /* Don't yet allow changing of symlinks with ALTER TABLE */
2884
      if (create_info.data_file_name)
2885 2886 2887
        push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                            WARN_OPTION_IGNORED, ER(WARN_OPTION_IGNORED),
                            "DATA DIRECTORY");
2888
      if (create_info.index_file_name)
2889 2890 2891
        push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                            WARN_OPTION_IGNORED, ER(WARN_OPTION_IGNORED),
                            "INDEX DIRECTORY");
2892
      create_info.data_file_name= create_info.index_file_name= NULL;
2893 2894

      thd->enable_slow_log= opt_log_slow_admin_statements;
2895
      res= mysql_alter_table(thd, select_lex->db, lex->name.str,
2896 2897 2898
                             &create_info,
                             first_table,
                             &alter_info,
2899 2900
                             select_lex->order_list.elements,
                             (ORDER *) select_lex->order_list.first,
2901
                             lex->ignore);
unknown's avatar
unknown committed
2902 2903
      break;
    }
unknown's avatar
unknown committed
2904
  case SQLCOM_RENAME_TABLE:
unknown's avatar
unknown committed
2905
  {
unknown's avatar
VIEW  
unknown committed
2906
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
2907
    TABLE_LIST *table;
unknown's avatar
VIEW  
unknown committed
2908
    for (table= first_table; table; table= table->next_local->next_local)
unknown's avatar
unknown committed
2909
    {
unknown's avatar
unknown committed
2910
      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
Marc Alff's avatar
Marc Alff committed
2911 2912 2913 2914 2915 2916 2917
                       &table->grant.privilege,
                       &table->grant.m_internal,
                       0, 0) ||
          check_access(thd, INSERT_ACL | CREATE_ACL, table->next_local->db,
                       &table->next_local->grant.privilege,
                       &table->next_local->grant.m_internal,
                       0, 0))
unknown's avatar
unknown committed
2918
	goto error;
2919 2920 2921 2922 2923 2924 2925
      TABLE_LIST old_list, new_list;
      /*
        we do not need initialize old_list and new_list because we will
        come table[0] and table->next[0] there
      */
      old_list= table[0];
      new_list= table->next_local[0];
2926
      if (check_grant(thd, ALTER_ACL | DROP_ACL, &old_list, FALSE, 1, FALSE) ||
2927 2928
         (!test_all_bits(table->next_local->grant.privilege,
                         INSERT_ACL | CREATE_ACL) &&
2929 2930
          check_grant(thd, INSERT_ACL | CREATE_ACL, &new_list, FALSE, 1,
                      FALSE)))
2931
        goto error;
unknown's avatar
unknown committed
2932
    }
2933

Konstantin Osipov's avatar
Konstantin Osipov committed
2934
    if (mysql_rename_tables(thd, first_table, 0))
unknown's avatar
unknown committed
2935
      goto error;
unknown's avatar
unknown committed
2936
    break;
unknown's avatar
unknown committed
2937
  }
2938
#ifndef EMBEDDED_LIBRARY
unknown's avatar
unknown committed
2939 2940
  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
unknown's avatar
unknown committed
2941 2942
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
2943
    goto error;
unknown's avatar
unknown committed
2944 2945
#else
    {
unknown's avatar
unknown committed
2946
      if (check_global_access(thd, SUPER_ACL))
unknown's avatar
unknown committed
2947 2948 2949 2950
	goto error;
      res = show_binlogs(thd);
      break;
    }
unknown's avatar
unknown committed
2951
#endif
2952
#endif /* EMBEDDED_LIBRARY */
unknown's avatar
unknown committed
2953
  case SQLCOM_SHOW_CREATE:
unknown's avatar
VIEW  
unknown committed
2954
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
2955
#ifdef DONT_ALLOW_SHOW_COMMANDS
unknown's avatar
unknown committed
2956 2957
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
2958
    goto error;
unknown's avatar
unknown committed
2959
#else
unknown's avatar
unknown committed
2960
    {
2961 2962 2963 2964 2965 2966 2967 2968 2969
     /*
        Access check:
        SHOW CREATE TABLE require any privileges on the table level (ie
        effecting all columns in the table).
        SHOW CREATE VIEW require the SHOW_VIEW and SELECT ACLs on the table
        level.
        NOTE: SHOW_VIEW ACL is checked when the view is created.
      */

2970 2971 2972
      DBUG_PRINT("debug", ("lex->only_view: %d, table: %s.%s",
                           lex->only_view,
                           first_table->db, first_table->table_name));
2973
      if (lex->only_view)
2974 2975 2976
      {
        if (check_table_access(thd, SELECT_ACL, first_table, FALSE, 1, FALSE))
        {
2977
          DBUG_PRINT("debug", ("check_table_access failed"));
2978 2979 2980 2981 2982
          my_error(ER_TABLEACCESS_DENIED_ERROR, MYF(0),
                  "SHOW", thd->security_ctx->priv_user,
                  thd->security_ctx->host_or_ip, first_table->alias);
          goto error;
        }
2983
        DBUG_PRINT("debug", ("check_table_access succeeded"));
2984 2985

        /* Ignore temporary tables if this is "SHOW CREATE VIEW" */
2986 2987
        first_table->open_type= OT_BASE_ONLY;

2988 2989 2990 2991
      }
      else
      {
        /*
Marc Alff's avatar
Marc Alff committed
2992 2993 2994
          The fact that check_some_access() returned FALSE does not mean that
          access is granted. We need to check if first_table->grant.privilege
          contains any table-specific privilege.
2995
        */
Mattias Jonsson's avatar
Mattias Jonsson committed
2996
        DBUG_PRINT("debug", ("first_table->grant.privilege: %lx",
2997
                             first_table->grant.privilege));
Marc Alff's avatar
Marc Alff committed
2998 2999
        if (check_some_access(thd, SHOW_CREATE_TABLE_ACLS, first_table) ||
            (first_table->grant.privilege & SHOW_CREATE_TABLE_ACLS) == 0)
3000 3001 3002 3003 3004 3005 3006 3007
        {
          my_error(ER_TABLEACCESS_DENIED_ERROR, MYF(0),
                  "SHOW", thd->security_ctx->priv_user,
                  thd->security_ctx->host_or_ip, first_table->alias);
          goto error;
        }
      }

3008
      /* Access is granted. Execute the command.  */
unknown's avatar
unknown committed
3009
      res= mysqld_show_create(thd, first_table);
unknown's avatar
unknown committed
3010 3011
      break;
    }
unknown's avatar
unknown committed
3012
#endif
3013 3014
  case SQLCOM_CHECKSUM:
  {
unknown's avatar
VIEW  
unknown committed
3015
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3016 3017
    if (check_table_access(thd, SELECT_ACL, all_tables,
                           FALSE, UINT_MAX, FALSE))
3018
      goto error; /* purecov: inspected */
3019

unknown's avatar
VIEW  
unknown committed
3020
    res = mysql_checksum_table(thd, first_table, &lex->check_opt);
3021 3022
    break;
  }
unknown's avatar
unknown committed
3023
  case SQLCOM_REPAIR:
3024
  {
unknown's avatar
VIEW  
unknown committed
3025
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3026
    if (check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables,
3027
                           FALSE, UINT_MAX, FALSE))
3028
      goto error; /* purecov: inspected */
3029
    thd->enable_slow_log= opt_log_slow_admin_statements;
unknown's avatar
VIEW  
unknown committed
3030
    res= mysql_repair_table(thd, first_table, &lex->check_opt);
3031 3032 3033
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
3034 3035 3036
      /*
        Presumably, REPAIR and binlog writing doesn't require synchronization
      */
3037
      res= write_bin_log(thd, TRUE, thd->query(), thd->query_length());
3038
    }
3039
    select_lex->table_list.first= (uchar*) first_table;
3040
    lex->query_tables=all_tables;
3041 3042
    break;
  }
unknown's avatar
unknown committed
3043
  case SQLCOM_CHECK:
3044
  {
unknown's avatar
VIEW  
unknown committed
3045
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3046 3047
    if (check_table_access(thd, SELECT_ACL, all_tables,
                           TRUE, UINT_MAX, FALSE))
3048
      goto error; /* purecov: inspected */
3049
    thd->enable_slow_log= opt_log_slow_admin_statements;
unknown's avatar
VIEW  
unknown committed
3050
    res = mysql_check_table(thd, first_table, &lex->check_opt);
3051
    select_lex->table_list.first= (uchar*) first_table;
3052
    lex->query_tables=all_tables;
3053 3054
    break;
  }
unknown's avatar
unknown committed
3055 3056
  case SQLCOM_ANALYZE:
  {
unknown's avatar
VIEW  
unknown committed
3057
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3058
    if (check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables,
3059
                           FALSE, UINT_MAX, FALSE))
unknown's avatar
unknown committed
3060
      goto error; /* purecov: inspected */
3061
    thd->enable_slow_log= opt_log_slow_admin_statements;
3062
    res= mysql_analyze_table(thd, first_table, &lex->check_opt);
3063 3064 3065
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
3066 3067 3068
      /*
        Presumably, ANALYZE and binlog writing doesn't require synchronization
      */
3069
      res= write_bin_log(thd, TRUE, thd->query(), thd->query_length());
3070
    }
3071
    select_lex->table_list.first= (uchar*) first_table;
3072
    lex->query_tables=all_tables;
unknown's avatar
unknown committed
3073
    break;
unknown's avatar
unknown committed
3074
  }
3075

unknown's avatar
unknown committed
3076 3077
  case SQLCOM_OPTIMIZE:
  {
unknown's avatar
VIEW  
unknown committed
3078
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3079
    if (check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables,
3080
                           FALSE, UINT_MAX, FALSE))
unknown's avatar
unknown committed
3081
      goto error; /* purecov: inspected */
3082
    thd->enable_slow_log= opt_log_slow_admin_statements;
3083
    res= (specialflag & (SPECIAL_SAFE_MODE | SPECIAL_NO_NEW_FUNC)) ?
3084
      mysql_recreate_table(thd, first_table) :
unknown's avatar
VIEW  
unknown committed
3085
      mysql_optimize_table(thd, first_table, &lex->check_opt);
3086 3087 3088
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
3089 3090 3091
      /*
        Presumably, OPTIMIZE and binlog writing doesn't require synchronization
      */
3092
      res= write_bin_log(thd, TRUE, thd->query(), thd->query_length());
3093
    }
3094
    select_lex->table_list.first= (uchar*) first_table;
3095
    lex->query_tables=all_tables;
unknown's avatar
unknown committed
3096 3097 3098
    break;
  }
  case SQLCOM_UPDATE:
3099 3100
  {
    ha_rows found= 0, updated= 0;
unknown's avatar
VIEW  
unknown committed
3101 3102
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (update_precheck(thd, all_tables))
unknown's avatar
unknown committed
3103
      break;
3104 3105
    DBUG_ASSERT(select_lex->offset_limit == 0);
    unit->set_limit(select_lex);
3106
    MYSQL_UPDATE_START(thd->query());
unknown's avatar
unknown committed
3107 3108 3109 3110 3111 3112 3113
    res= (up_result= mysql_update(thd, all_tables,
                                  select_lex->item_list,
                                  lex->value_list,
                                  select_lex->where,
                                  select_lex->order_list.elements,
                                  (ORDER *) select_lex->order_list.first,
                                  unit->select_limit_cnt,
3114 3115 3116
                                  lex->duplicates, lex->ignore,
                                  &found, &updated));
    MYSQL_UPDATE_DONE(res, found, updated);
3117
    /* mysql_update return 2 if we need to switch to multi-update */
unknown's avatar
unknown committed
3118
    if (up_result != 2)
3119
      break;
unknown's avatar
unknown committed
3120
    /* Fall through */
3121
  }
3122
  case SQLCOM_UPDATE_MULTI:
unknown's avatar
unknown committed
3123 3124 3125
  {
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    /* if we switched from normal update, rights are checked */
unknown's avatar
unknown committed
3126
    if (up_result != 2)
3127
    {
unknown's avatar
unknown committed
3128 3129 3130 3131 3132
      if ((res= multi_update_precheck(thd, all_tables)))
        break;
    }
    else
      res= 0;
unknown's avatar
unknown committed
3133

3134
    res= mysql_multi_update_prepare(thd);
unknown's avatar
unknown committed
3135

3136
#ifdef HAVE_REPLICATION
unknown's avatar
unknown committed
3137
    /* Check slave filtering rules */
3138
    if (unlikely(thd->slave_thread && !have_table_map_for_update))
unknown's avatar
unknown committed
3139
    {
3140 3141
      if (all_tables_not_ok(thd, all_tables))
      {
3142 3143 3144 3145 3146
        if (res!= 0)
        {
          res= 0;             /* don't care of prev failure  */
          thd->clear_error(); /* filters are of highest prior */
        }
3147 3148 3149 3150
        /* we warn the slave SQL thread */
        my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
        break;
      }
3151 3152
      if (res)
        break;
unknown's avatar
unknown committed
3153
    }
3154 3155
    else
    {
3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168
#endif /* HAVE_REPLICATION */
      if (res)
        break;
      if (opt_readonly &&
	  !(thd->security_ctx->master_access & SUPER_ACL) &&
	  some_non_temp_table_to_be_updated(thd, all_tables))
      {
	my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
	break;
      }
#ifdef HAVE_REPLICATION
    }  /* unlikely */
#endif
3169 3170
    {
      multi_update *result_obj;
3171
      MYSQL_MULTI_UPDATE_START(thd->query());
3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193
      res= mysql_multi_update(thd, all_tables,
                              &select_lex->item_list,
                              &lex->value_list,
                              select_lex->where,
                              select_lex->options,
                              lex->duplicates,
                              lex->ignore,
                              unit,
                              select_lex,
                              &result_obj);
      if (result_obj)
      {
        MYSQL_MULTI_UPDATE_DONE(res, result_obj->num_found(),
                                result_obj->num_updated());
        res= FALSE; /* Ignore errors here */
        delete result_obj;
      }
      else
      {
        MYSQL_MULTI_UPDATE_DONE(1, 0, 0);
      }
    }
unknown's avatar
unknown committed
3194
    break;
unknown's avatar
unknown committed
3195
  }
unknown's avatar
unknown committed
3196
  case SQLCOM_REPLACE:
3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220
#ifndef DBUG_OFF
    if (mysql_bin_log.is_open())
    {
      /*
        Generate an incident log event before writing the real event
        to the binary log.  We put this event is before the statement
        since that makes it simpler to check that the statement was
        not executed on the slave (since incidents usually stop the
        slave).

        Observe that any row events that are generated will be
        generated before.

        This is only for testing purposes and will not be present in a
        release build.
      */

      Incident incident= INCIDENT_NONE;
      DBUG_PRINT("debug", ("Just before generate_incident()"));
      DBUG_EXECUTE_IF("incident_database_resync_on_replace",
                      incident= INCIDENT_LOST_EVENTS;);
      if (incident)
      {
        Incident_log_event ev(thd, incident);
3221
        (void) mysql_bin_log.write(&ev);        /* error is ignored */
3222 3223 3224 3225 3226
        mysql_bin_log.rotate_and_purge(RP_FORCE_ROTATE);
      }
      DBUG_PRINT("debug", ("Just after generate_incident()"));
    }
#endif
3227 3228
  case SQLCOM_INSERT:
  {
unknown's avatar
VIEW  
unknown committed
3229
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
3230
    if ((res= insert_precheck(thd, all_tables)))
unknown's avatar
unknown committed
3231
      break;
3232

3233
    MYSQL_INSERT_START(thd->query());
unknown's avatar
VIEW  
unknown committed
3234
    res= mysql_insert(thd, all_tables, lex->field_list, lex->many_values,
unknown's avatar
unknown committed
3235
		      lex->update_list, lex->value_list,
3236
                      lex->duplicates, lex->ignore);
3237
    MYSQL_INSERT_DONE(res, (ulong) thd->get_row_count_func());
3238 3239 3240 3241 3242 3243
    /*
      If we have inserted into a VIEW, and the base table has
      AUTO_INCREMENT column, but this column is not accessible through
      a view, then we should restore LAST_INSERT_ID to the value it
      had before the statement.
    */
unknown's avatar
VIEW  
unknown committed
3244
    if (first_table->view && !first_table->contain_auto_increment)
3245 3246
      thd->first_successful_insert_id_in_cur_stmt=
        thd->first_successful_insert_id_in_prev_stmt;
3247

unknown's avatar
unknown committed
3248
    break;
3249
  }
unknown's avatar
unknown committed
3250 3251 3252
  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
unknown's avatar
unknown committed
3253
    select_result *sel_result;
unknown's avatar
VIEW  
unknown committed
3254
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
3255
    if ((res= insert_precheck(thd, all_tables)))
3256
      break;
unknown's avatar
unknown committed
3257

3258
    /* Fix lock for first table */
unknown's avatar
VIEW  
unknown committed
3259 3260
    if (first_table->lock_type == TL_WRITE_DELAYED)
      first_table->lock_type= TL_WRITE;
3261

3262 3263
    /* Don't unlock tables until command is written to binary log */
    select_lex->options|= SELECT_NO_UNLOCK;
unknown's avatar
unknown committed
3264

3265
    unit->set_limit(select_lex);
3266

3267
    if (!(res= open_and_lock_tables(thd, all_tables, TRUE, 0)))
3268
    {
3269
      MYSQL_INSERT_SELECT_START(thd->query());
3270
      /* Skip first table, which is the table we are inserting in */
unknown's avatar
unknown committed
3271
      TABLE_LIST *second_table= first_table->next_local;
3272
      select_lex->table_list.first= (uchar*) second_table;
3273 3274
      select_lex->context.table_list= 
        select_lex->context.first_name_resolution_table= second_table;
3275
      res= mysql_insert_select_prepare(thd);
unknown's avatar
unknown committed
3276 3277 3278 3279 3280 3281 3282
      if (!res && (sel_result= new select_insert(first_table,
                                                 first_table->table,
                                                 &lex->field_list,
                                                 &lex->update_list,
                                                 &lex->value_list,
                                                 lex->duplicates,
                                                 lex->ignore)))
3283
      {
unknown's avatar
unknown committed
3284
	res= handle_select(thd, lex, sel_result, OPTION_SETUP_TABLES_DONE);
3285 3286 3287 3288 3289 3290
        /*
          Invalidate the table in the query cache if something changed
          after unlocking when changes become visible.
          TODO: this is workaround. right way will be move invalidating in
          the unlock procedure.
        */
3291
        if (!res && first_table->lock_type ==  TL_WRITE_CONCURRENT_INSERT &&
3292 3293
            thd->lock)
        {
3294 3295 3296
          /* INSERT ... SELECT should invalidate only the very first table */
          TABLE_LIST *save_table= first_table->next_local;
          first_table->next_local= 0;
3297
          query_cache_invalidate3(thd, first_table, 1);
3298
          first_table->next_local= save_table;
3299
        }
unknown's avatar
unknown committed
3300
        delete sel_result;
3301
      }
3302
      /* revert changes for SP */
3303
      MYSQL_INSERT_SELECT_DONE(res, (ulong) thd->get_row_count_func());
3304
      select_lex->table_list.first= (uchar*) first_table;
3305
    }
3306 3307 3308 3309 3310 3311
    /*
      If we have inserted into a VIEW, and the base table has
      AUTO_INCREMENT column, but this column is not accessible through
      a view, then we should restore LAST_INSERT_ID to the value it
      had before the statement.
    */
unknown's avatar
VIEW  
unknown committed
3312
    if (first_table->view && !first_table->contain_auto_increment)
3313 3314
      thd->first_successful_insert_id_in_cur_stmt=
        thd->first_successful_insert_id_in_prev_stmt;
3315

unknown's avatar
unknown committed
3316 3317
    break;
  }
3318
  case SQLCOM_TRUNCATE:
unknown's avatar
VIEW  
unknown committed
3319
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
3320
    if (check_one_table_access(thd, DROP_ACL, all_tables))
unknown's avatar
unknown committed
3321
      goto error;
3322 3323 3324 3325
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
3326
    if (thd->in_active_multi_stmt_transaction())
3327
    {
unknown's avatar
unknown committed
3328 3329
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3330 3331
      goto error;
    }
3332 3333
    if (! (res= mysql_truncate_table(thd, first_table)))
      my_ok(thd);
3334
    break;
unknown's avatar
unknown committed
3335
  case SQLCOM_DELETE:
unknown's avatar
unknown committed
3336
  {
unknown's avatar
VIEW  
unknown committed
3337 3338
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if ((res= delete_precheck(thd, all_tables)))
unknown's avatar
unknown committed
3339
      break;
3340 3341
    DBUG_ASSERT(select_lex->offset_limit == 0);
    unit->set_limit(select_lex);
3342

3343
    MYSQL_DELETE_START(thd->query());
unknown's avatar
VIEW  
unknown committed
3344
    res = mysql_delete(thd, all_tables, select_lex->where,
3345
                       &select_lex->order_list,
3346
                       unit->select_limit_cnt, select_lex->options);
3347
    MYSQL_DELETE_DONE(res, (ulong) thd->get_row_count_func());
unknown's avatar
unknown committed
3348 3349
    break;
  }
3350
  case SQLCOM_DELETE_MULTI:
unknown's avatar
unknown committed
3351
  {
unknown's avatar
VIEW  
unknown committed
3352
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3353
    TABLE_LIST *aux_tables=
unknown's avatar
unknown committed
3354
      (TABLE_LIST *)thd->lex->auxiliary_table_list.first;
unknown's avatar
unknown committed
3355
    multi_delete *del_result;
unknown's avatar
unknown committed
3356

3357
    if ((res= multi_delete_precheck(thd, all_tables)))
3358
      break;
unknown's avatar
unknown committed
3359

unknown's avatar
unknown committed
3360
    /* condition will be TRUE on SP re-excuting */
3361 3362
    if (select_lex->item_list.elements != 0)
      select_lex->item_list.empty();
unknown's avatar
unknown committed
3363
    if (add_item_to_list(thd, new Item_null()))
unknown's avatar
unknown committed
3364
      goto error;
3365

3366
    thd_proc_info(thd, "init");
3367
    if ((res= open_and_lock_tables(thd, all_tables, TRUE, 0)))
unknown's avatar
VIEW  
unknown committed
3368 3369
      break;

3370
    MYSQL_MULTI_DELETE_START(thd->query());
unknown's avatar
VIEW  
unknown committed
3371
    if ((res= mysql_multi_delete_prepare(thd)))
3372 3373
    {
      MYSQL_MULTI_DELETE_DONE(1, 0);
unknown's avatar
unknown committed
3374
      goto error;
3375
    }
3376

unknown's avatar
unknown committed
3377 3378
    if (!thd->is_fatal_error &&
        (del_result= new multi_delete(aux_tables, lex->table_count)))
unknown's avatar
unknown committed
3379
    {
3380 3381 3382
      res= mysql_select(thd, &select_lex->ref_pointer_array,
			select_lex->get_table_list(),
			select_lex->with_wild,
3383
			select_lex->item_list,
unknown's avatar
unknown committed
3384
			select_lex->where,
3385
			0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
unknown's avatar
unknown committed
3386
			(ORDER *)NULL,
3387
			(select_lex->options | thd->variables.option_bits |
3388
			SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK |
3389
                        OPTION_SETUP_TABLES_DONE) & ~OPTION_BUFFER_RESULT,
unknown's avatar
unknown committed
3390
			del_result, unit, select_lex);
3391
      res|= thd->is_error();
3392
      MYSQL_MULTI_DELETE_DONE(res, del_result->num_deleted());
3393
      if (res)
3394
        del_result->abort();
unknown's avatar
unknown committed
3395
      delete del_result;
unknown's avatar
unknown committed
3396 3397
    }
    else
3398
    {
3399
      res= TRUE;                                // Error
3400 3401
      MYSQL_MULTI_DELETE_DONE(1, 0);
    }
unknown's avatar
unknown committed
3402 3403
    break;
  }
unknown's avatar
unknown committed
3404
  case SQLCOM_DROP_TABLE:
unknown's avatar
unknown committed
3405
  {
unknown's avatar
VIEW  
unknown committed
3406
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3407 3408
    if (!lex->drop_temporary)
    {
3409
      if (check_table_access(thd, DROP_ACL, all_tables, FALSE, UINT_MAX, FALSE))
3410 3411
	goto error;				/* purecov: inspected */
    }
unknown's avatar
unknown committed
3412
    else
unknown's avatar
unknown committed
3413
    {
unknown's avatar
unknown committed
3414
      /* So that DROP TEMPORARY TABLE gets to binlog at commit/rollback */
3415
      thd->variables.option_bits|= OPTION_KEEP_LOG;
unknown's avatar
unknown committed
3416
    }
3417
    /* DDL and binlog write order protected by LOCK_open */
unknown's avatar
VIEW  
unknown committed
3418 3419
    res= mysql_rm_table(thd, first_table, lex->drop_if_exists,
			lex->drop_temporary);
unknown's avatar
unknown committed
3420 3421
  }
  break;
unknown's avatar
unknown committed
3422
  case SQLCOM_SHOW_PROCESSLIST:
3423 3424
    if (!thd->security_ctx->priv_user[0] &&
        check_global_access(thd,PROCESS_ACL))
unknown's avatar
unknown committed
3425
      break;
unknown's avatar
unknown committed
3426
    mysqld_list_processes(thd,
3427 3428 3429 3430
			  (thd->security_ctx->master_access & PROCESS_ACL ?
                           NullS :
                           thd->security_ctx->priv_user),
                          lex->verbose);
unknown's avatar
unknown committed
3431
    break;
unknown's avatar
unknown committed
3432 3433 3434
  case SQLCOM_SHOW_AUTHORS:
    res= mysqld_show_authors(thd);
    break;
3435 3436 3437
  case SQLCOM_SHOW_CONTRIBUTORS:
    res= mysqld_show_contributors(thd);
    break;
unknown's avatar
unknown committed
3438 3439 3440
  case SQLCOM_SHOW_PRIVILEGES:
    res= mysqld_show_privileges(thd);
    break;
unknown's avatar
unknown committed
3441
  case SQLCOM_SHOW_ENGINE_LOGS:
unknown's avatar
unknown committed
3442
#ifdef DONT_ALLOW_SHOW_COMMANDS
unknown's avatar
unknown committed
3443 3444
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0));	/* purecov: inspected */
3445
    goto error;
unknown's avatar
unknown committed
3446 3447
#else
    {
Marc Alff's avatar
Marc Alff committed
3448
      if (check_access(thd, FILE_ACL, any_db, NULL, NULL, 0, 0))
unknown's avatar
unknown committed
3449
	goto error;
unknown's avatar
unknown committed
3450
      res= ha_show_status(thd, lex->create_info.db_type, HA_ENGINE_LOGS);
unknown's avatar
unknown committed
3451 3452
      break;
    }
unknown's avatar
unknown committed
3453 3454
#endif
  case SQLCOM_CHANGE_DB:
3455 3456 3457 3458
  {
    LEX_STRING db_str= { (char *) select_lex->db, strlen(select_lex->db) };

    if (!mysql_change_db(thd, &db_str, FALSE))
3459
      my_ok(thd);
3460

unknown's avatar
unknown committed
3461
    break;
3462
  }
3463

unknown's avatar
unknown committed
3464 3465
  case SQLCOM_LOAD:
  {
unknown's avatar
VIEW  
unknown committed
3466
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
3467
    uint privilege= (lex->duplicates == DUP_REPLACE ?
unknown's avatar
unknown committed
3468 3469
		     INSERT_ACL | DELETE_ACL : INSERT_ACL) |
                    (lex->local_file ? 0 : FILE_ACL);
3470

unknown's avatar
unknown committed
3471
    if (lex->local_file)
unknown's avatar
unknown committed
3472
    {
3473
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
3474
          !opt_local_infile)
3475
      {
unknown's avatar
unknown committed
3476
	my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND), MYF(0));
3477 3478
	goto error;
      }
unknown's avatar
unknown committed
3479
    }
unknown's avatar
unknown committed
3480 3481 3482 3483

    if (check_one_table_access(thd, privilege, all_tables))
      goto error;

unknown's avatar
VIEW  
unknown committed
3484
    res= mysql_load(thd, lex->exchange, first_table, lex->field_list,
unknown's avatar
unknown committed
3485
                    lex->update_list, lex->value_list, lex->duplicates,
3486
                    lex->ignore, (bool) lex->local_file);
unknown's avatar
unknown committed
3487 3488
    break;
  }
3489

unknown's avatar
unknown committed
3490
  case SQLCOM_SET_OPTION:
3491 3492
  {
    List<set_var_base> *lex_var_list= &lex->var_list;
3493

3494
    if ((check_table_access(thd, SELECT_ACL, all_tables, FALSE, UINT_MAX, FALSE)
3495
         || open_and_lock_tables(thd, all_tables, TRUE, 0)))
unknown's avatar
unknown committed
3496
      goto error;
3497 3498 3499 3500 3501 3502 3503
    if (!(res= sql_set_variables(thd, lex_var_list)))
    {
      /*
        If the previous command was a SET ONE_SHOT, we don't want to forget
        about the ONE_SHOT property of that SET. So we use a |= instead of = .
      */
      thd->one_shot_set|= lex->one_shot_set;
3504
      my_ok(thd);
3505
    }
3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517
    else
    {
      /*
        We encountered some sort of error, but no message was sent.
        Send something semi-generic here since we don't know which
        assignment in the list caused the error.
      */
      if (!thd->is_error())
        my_error(ER_WRONG_ARGUMENTS,MYF(0),"SET");
      goto error;
    }

unknown's avatar
unknown committed
3518
    break;
3519
  }
unknown's avatar
unknown committed
3520

unknown's avatar
unknown committed
3521
  case SQLCOM_UNLOCK_TABLES:
3522 3523 3524 3525 3526 3527
    /*
      It is critical for mysqldump --single-transaction --master-data that
      UNLOCK TABLES does not implicitely commit a connection which has only
      done FLUSH TABLES WITH READ LOCK + BEGIN. If this assumption becomes
      false, mysqldump will not work.
    */
Konstantin Osipov's avatar
Konstantin Osipov committed
3528
    thd->locked_tables_list.unlock_locked_tables(thd);
3529
    if (thd->variables.option_bits & OPTION_TABLE_LOCK)
unknown's avatar
unknown committed
3530
    {
Konstantin Osipov's avatar
Konstantin Osipov committed
3531
      trans_commit_implicit(thd);
3532
      thd->mdl_context.release_transactional_locks();
3533
      thd->variables.option_bits&= ~(OPTION_TABLE_LOCK);
unknown's avatar
unknown committed
3534
    }
3535 3536
    if (thd->global_read_lock.is_acquired())
      thd->global_read_lock.unlock_global_read_lock(thd);
3537
    my_ok(thd);
unknown's avatar
unknown committed
3538 3539
    break;
  case SQLCOM_LOCK_TABLES:
Konstantin Osipov's avatar
Konstantin Osipov committed
3540
    thd->locked_tables_list.unlock_locked_tables(thd);
3541
    /* we must end the trasaction first, regardless of anything */
Konstantin Osipov's avatar
Konstantin Osipov committed
3542
    if (trans_commit_implicit(thd))
unknown's avatar
unknown committed
3543
      goto error;
3544
    /* release transactional metadata locks. */
3545
    thd->mdl_context.release_transactional_locks();
3546
    if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, all_tables,
3547
                           FALSE, UINT_MAX, FALSE))
3548
      goto error;
3549
    if (lex->protect_against_global_read_lock &&
3550
        thd->global_read_lock.wait_if_global_read_lock(thd, FALSE, TRUE))
3551
      goto error;
Konstantin Osipov's avatar
Konstantin Osipov committed
3552

3553
    thd->variables.option_bits|= OPTION_TABLE_LOCK;
Konstantin Osipov's avatar
Konstantin Osipov committed
3554
    thd->in_lock_tables=1;
unknown's avatar
VIEW  
unknown committed
3555

Konstantin Osipov's avatar
Konstantin Osipov committed
3556 3557 3558
    {
      Lock_tables_prelocking_strategy lock_tables_prelocking_strategy;

3559
      res= (open_and_lock_tables(thd, all_tables, FALSE, 0,
3560
                                 &lock_tables_prelocking_strategy) ||
Konstantin Osipov's avatar
Konstantin Osipov committed
3561 3562
            thd->locked_tables_list.init_locked_tables(thd));
    }
Konstantin Osipov's avatar
Konstantin Osipov committed
3563 3564 3565 3566

    thd->in_lock_tables= 0;

    if (res)
3567
    {
Konstantin Osipov's avatar
Konstantin Osipov committed
3568
      /*
3569 3570 3571 3572
        Need to end the current transaction, so the storage engine (InnoDB)
        can free its locks if LOCK TABLES locked some tables before finding
        that it can't lock a table in its list
      */
Konstantin Osipov's avatar
Konstantin Osipov committed
3573 3574
      trans_rollback_stmt(thd);
      trans_commit_implicit(thd);
3575 3576 3577 3578 3579 3580
      /*
        Close tables and release metadata locks otherwise a later call to
        close_thread_tables might not release the locks if autocommit is off.
      */
      close_thread_tables(thd);
      DBUG_ASSERT(!thd->locked_tables_mode);
3581
      thd->mdl_context.release_transactional_locks();
3582
      thd->variables.option_bits&= ~(OPTION_TABLE_LOCK);
3583
    }
Konstantin Osipov's avatar
Konstantin Osipov committed
3584 3585 3586 3587 3588 3589 3590 3591
    else
    {
#ifdef HAVE_QUERY_CACHE
      if (thd->variables.query_cache_wlock_invalidate)
        query_cache.invalidate_locked_for_write(first_table);
#endif /*HAVE_QUERY_CACHE*/
      my_ok(thd);
    }
unknown's avatar
unknown committed
3592 3593
    break;
  case SQLCOM_CREATE_DB:
3594
  {
3595 3596 3597 3598 3599 3600
    /*
      As mysql_create_db() may modify HA_CREATE_INFO structure passed to
      it, we need to use a copy of LEX::create_info to make execution
      prepared statement- safe.
    */
    HA_CREATE_INFO create_info(lex->create_info);
unknown's avatar
unknown committed
3601
    char *alias;
3602 3603
    if (!(alias=thd->strmake(lex->name.str, lex->name.length)) ||
        check_db_name(&lex->name))
unknown's avatar
unknown committed
3604
    {
3605
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name.str);
unknown's avatar
unknown committed
3606 3607
      break;
    }
3608 3609 3610
    /*
      If in a slave thread :
      CREATE DATABASE DB was certainly not preceded by USE DB.
3611
      For that reason, db_ok() in sql/slave.cc did not check the
3612 3613 3614
      do_db/ignore_db. And as this query involves no tables, tables_ok()
      above was not called. So we have to check rules again here.
    */
3615
#ifdef HAVE_REPLICATION
unknown's avatar
unknown committed
3616
    if (thd->slave_thread && 
3617 3618
	(!rpl_filter->db_ok(lex->name.str) ||
	 !rpl_filter->db_ok_with_wild_table(lex->name.str)))
unknown's avatar
unknown committed
3619
    {
unknown's avatar
unknown committed
3620
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
3621
      break;
unknown's avatar
unknown committed
3622
    }
3623
#endif
Marc Alff's avatar
Marc Alff committed
3624
    if (check_access(thd, CREATE_ACL, lex->name.str, NULL, NULL, 1, 0))
3625
      break;
3626 3627 3628 3629 3630 3631
    if (thd->locked_tables_mode)
    {
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
      goto error;
    }
3632
    res= mysql_create_db(thd,(lower_case_table_names == 2 ? alias :
3633
                              lex->name.str), &create_info, 0);
3634 3635
    break;
  }
unknown's avatar
unknown committed
3636
  case SQLCOM_DROP_DB:
3637
  {
3638
    if (check_db_name(&lex->name))
unknown's avatar
unknown committed
3639
    {
3640
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name.str);
unknown's avatar
unknown committed
3641 3642
      break;
    }
3643 3644 3645 3646 3647 3648 3649
    /*
      If in a slave thread :
      DROP DATABASE DB may not be preceded by USE DB.
      For that reason, maybe db_ok() in sql/slave.cc did not check the 
      do_db/ignore_db. And as this query involves no tables, tables_ok()
      above was not called. So we have to check rules again here.
    */
3650
#ifdef HAVE_REPLICATION
3651
    if (thd->slave_thread && 
3652 3653
	(!rpl_filter->db_ok(lex->name.str) ||
	 !rpl_filter->db_ok_with_wild_table(lex->name.str)))
unknown's avatar
unknown committed
3654
    {
unknown's avatar
unknown committed
3655
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
3656
      break;
unknown's avatar
unknown committed
3657
    }
3658
#endif
Marc Alff's avatar
Marc Alff committed
3659
    if (check_access(thd, DROP_ACL, lex->name.str, NULL, NULL, 1, 0))
3660
      break;
3661
    if (thd->locked_tables_mode)
3662
    {
unknown's avatar
unknown committed
3663 3664
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3665 3666
      goto error;
    }
3667
    res= mysql_rm_db(thd, lex->name.str, lex->drop_if_exists, 0);
3668 3669
    break;
  }
3670
  case SQLCOM_ALTER_DB_UPGRADE:
unknown's avatar
unknown committed
3671
  {
3672
    LEX_STRING *db= & lex->name;
unknown's avatar
unknown committed
3673 3674
#ifdef HAVE_REPLICATION
    if (thd->slave_thread && 
3675 3676
       (!rpl_filter->db_ok(db->str) ||
        !rpl_filter->db_ok_with_wild_table(db->str)))
unknown's avatar
unknown committed
3677 3678 3679 3680 3681 3682
    {
      res= 1;
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
      break;
    }
#endif
3683
    if (check_db_name(db))
3684
    {
3685
      my_error(ER_WRONG_DB_NAME, MYF(0), db->str);
3686 3687
      break;
    }
Marc Alff's avatar
Marc Alff committed
3688 3689 3690
    if (check_access(thd, ALTER_ACL, db->str, NULL, NULL, 1, 0) ||
        check_access(thd, DROP_ACL, db->str, NULL, NULL, 1, 0) ||
        check_access(thd, CREATE_ACL, db->str, NULL, NULL, 1, 0))
unknown's avatar
unknown committed
3691 3692 3693 3694
    {
      res= 1;
      break;
    }
3695
    if (thd->locked_tables_mode)
unknown's avatar
unknown committed
3696 3697 3698 3699 3700 3701
    {
      res= 1;
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
      goto error;
    }
3702 3703

    res= mysql_upgrade_db(thd, db);
unknown's avatar
unknown committed
3704
    if (!res)
3705
      my_ok(thd);
unknown's avatar
unknown committed
3706 3707
    break;
  }
3708 3709
  case SQLCOM_ALTER_DB:
  {
3710
    LEX_STRING *db= &lex->name;
3711
    HA_CREATE_INFO create_info(lex->create_info);
3712
    if (check_db_name(db))
3713
    {
3714
      my_error(ER_WRONG_DB_NAME, MYF(0), db->str);
3715 3716
      break;
    }
unknown's avatar
unknown committed
3717 3718 3719
    /*
      If in a slave thread :
      ALTER DATABASE DB may not be preceded by USE DB.
3720
      For that reason, maybe db_ok() in sql/slave.cc did not check the
unknown's avatar
unknown committed
3721 3722 3723 3724
      do_db/ignore_db. And as this query involves no tables, tables_ok()
      above was not called. So we have to check rules again here.
    */
#ifdef HAVE_REPLICATION
3725
    if (thd->slave_thread &&
3726 3727
	(!rpl_filter->db_ok(db->str) ||
	 !rpl_filter->db_ok_with_wild_table(db->str)))
unknown's avatar
unknown committed
3728
    {
unknown's avatar
unknown committed
3729
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
unknown's avatar
unknown committed
3730 3731 3732
      break;
    }
#endif
Marc Alff's avatar
Marc Alff committed
3733
    if (check_access(thd, ALTER_ACL, db->str, NULL, NULL, 1, 0))
3734
      break;
3735
    if (thd->locked_tables_mode)
3736
    {
unknown's avatar
unknown committed
3737 3738
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3739 3740
      goto error;
    }
3741
    res= mysql_alter_db(thd, db->str, &create_info);
3742 3743
    break;
  }
unknown's avatar
unknown committed
3744 3745
  case SQLCOM_SHOW_CREATE_DB:
  {
unknown's avatar
unknown committed
3746 3747
    DBUG_EXECUTE_IF("4x_server_emul",
                    my_error(ER_UNKNOWN_ERROR, MYF(0)); goto error;);
3748
    if (check_db_name(&lex->name))
unknown's avatar
unknown committed
3749
    {
3750
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name.str);
unknown's avatar
unknown committed
3751 3752
      break;
    }
3753
    res= mysqld_show_create_db(thd, lex->name.str, &lex->create_info);
unknown's avatar
unknown committed
3754 3755
    break;
  }
unknown's avatar
unknown committed
3756 3757
  case SQLCOM_CREATE_EVENT:
  case SQLCOM_ALTER_EVENT:
3758
  #ifdef HAVE_EVENT_SCHEDULER
3759
  do
unknown's avatar
unknown committed
3760
  {
unknown's avatar
unknown committed
3761
    DBUG_ASSERT(lex->event_parse_data);
unknown's avatar
unknown committed
3762 3763 3764 3765 3766 3767
    if (lex->table_or_sp_used())
    {
      my_error(ER_NOT_SUPPORTED_YET, MYF(0), "Usage of subqueries or stored "
               "function calls as part of this statement");
      break;
    }
3768 3769 3770 3771 3772

    res= sp_process_definer(thd);
    if (res)
      break;

unknown's avatar
unknown committed
3773 3774
    switch (lex->sql_command) {
    case SQLCOM_CREATE_EVENT:
3775 3776 3777 3778
    {
      bool if_not_exists= (lex->create_info.options &
                           HA_LEX_CREATE_IF_NOT_EXISTS);
      res= Events::create_event(thd, lex->event_parse_data, if_not_exists);
unknown's avatar
unknown committed
3779
      break;
3780
    }
unknown's avatar
unknown committed
3781
    case SQLCOM_ALTER_EVENT:
3782 3783 3784
      res= Events::update_event(thd, lex->event_parse_data,
                                lex->spname ? &lex->spname->m_db : NULL,
                                lex->spname ? &lex->spname->m_name : NULL);
unknown's avatar
unknown committed
3785
      break;
3786 3787
    default:
      DBUG_ASSERT(0);
unknown's avatar
unknown committed
3788
    }
3789
    DBUG_PRINT("info",("DDL error code=%d", res));
unknown's avatar
unknown committed
3790
    if (!res)
3791
      my_ok(thd);
unknown's avatar
unknown committed
3792

3793 3794 3795 3796 3797 3798
  } while (0);
  /* Don't do it, if we are inside a SP */
  if (!thd->spcont)
  {
    delete lex->sphead;
    lex->sphead= NULL;
unknown's avatar
unknown committed
3799
  }
3800 3801
  /* lex->unit.cleanup() is called outside, no need to call it here */
  break;
unknown's avatar
unknown committed
3802
  case SQLCOM_SHOW_CREATE_EVENT:
3803 3804 3805 3806 3807 3808 3809
    res= Events::show_create_event(thd, lex->spname->m_db,
                                   lex->spname->m_name);
    break;
  case SQLCOM_DROP_EVENT:
    if (!(res= Events::drop_event(thd,
                                  lex->spname->m_db, lex->spname->m_name,
                                  lex->drop_if_exists)))
3810
      my_ok(thd);
3811
    break;
3812 3813 3814 3815
#else
    my_error(ER_NOT_SUPPORTED_YET,MYF(0),"embedded server");
    break;
#endif
unknown's avatar
unknown committed
3816
  case SQLCOM_CREATE_FUNCTION:                  // UDF function
unknown's avatar
unknown committed
3817
  {
Marc Alff's avatar
Marc Alff committed
3818
    if (check_access(thd, INSERT_ACL, "mysql", NULL, NULL, 1, 0))
unknown's avatar
unknown committed
3819
      break;
unknown's avatar
unknown committed
3820
#ifdef HAVE_DLOPEN
3821
    if (!(res = mysql_create_function(thd, &lex->udf)))
3822
      my_ok(thd);
unknown's avatar
unknown committed
3823
#else
unknown's avatar
unknown committed
3824
    my_error(ER_CANT_OPEN_LIBRARY, MYF(0), lex->udf.dl, 0, "feature disabled");
unknown's avatar
unknown committed
3825
    res= TRUE;
unknown's avatar
unknown committed
3826 3827
#endif
    break;
unknown's avatar
unknown committed
3828
  }
unknown's avatar
unknown committed
3829
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3830 3831
  case SQLCOM_CREATE_USER:
  {
Marc Alff's avatar
Marc Alff committed
3832
    if (check_access(thd, INSERT_ACL, "mysql", NULL, NULL, 1, 1) &&
3833
        check_global_access(thd,CREATE_USER_ACL))
3834
      break;
3835
    /* Conditionally writes to binlog */
3836
    if (!(res= mysql_create_user(thd, lex->users_list)))
3837
      my_ok(thd);
3838 3839
    break;
  }
3840 3841
  case SQLCOM_DROP_USER:
  {
Marc Alff's avatar
Marc Alff committed
3842
    if (check_access(thd, DELETE_ACL, "mysql", NULL, NULL, 1, 1) &&
3843
        check_global_access(thd,CREATE_USER_ACL))
3844
      break;
3845
    /* Conditionally writes to binlog */
3846
    if (!(res= mysql_drop_user(thd, lex->users_list)))
3847
      my_ok(thd);
3848 3849 3850 3851
    break;
  }
  case SQLCOM_RENAME_USER:
  {
Marc Alff's avatar
Marc Alff committed
3852
    if (check_access(thd, UPDATE_ACL, "mysql", NULL, NULL, 1, 1) &&
3853
        check_global_access(thd,CREATE_USER_ACL))
3854
      break;
3855
    /* Conditionally writes to binlog */
3856
    if (!(res= mysql_rename_user(thd, lex->users_list)))
3857
      my_ok(thd);
3858 3859 3860 3861
    break;
  }
  case SQLCOM_REVOKE_ALL:
  {
Marc Alff's avatar
Marc Alff committed
3862
    if (check_access(thd, UPDATE_ACL, "mysql", NULL, NULL, 1, 1) &&
3863
        check_global_access(thd,CREATE_USER_ACL))
3864
      break;
3865
    /* Conditionally writes to binlog */
3866
    if (!(res = mysql_revoke_all(thd, lex->users_list)))
3867
      my_ok(thd);
3868 3869
    break;
  }
3870 3871 3872 3873
  case SQLCOM_REVOKE:
  case SQLCOM_GRANT:
  {
    if (check_access(thd, lex->grant | lex->grant_tot_col | GRANT_ACL,
Marc Alff's avatar
Marc Alff committed
3874 3875 3876 3877
                     first_table ?  first_table->db : select_lex->db,
                     first_table ? &first_table->grant.privilege : NULL,
                     first_table ? &first_table->grant.m_internal : NULL,
                     first_table ? 0 : 1, 0))
3878 3879
      goto error;

3880
    if (thd->security_ctx->user)              // If not replication
unknown's avatar
unknown committed
3881
    {
3882
      LEX_USER *user, *tmp_user;
3883

unknown's avatar
unknown committed
3884
      List_iterator <LEX_USER> user_list(lex->users_list);
3885
      while ((tmp_user= user_list++))
unknown's avatar
unknown committed
3886
      {
3887 3888
        if (!(user= get_current_user(thd, tmp_user)))
          goto error;
3889 3890 3891 3892 3893 3894 3895 3896
        if (specialflag & SPECIAL_NO_RESOLVE &&
            hostname_requires_resolving(user->host.str))
          push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                              ER_WARN_HOSTNAME_WONT_WORK,
                              ER(ER_WARN_HOSTNAME_WONT_WORK),
                              user->host.str);
        // Are we trying to change a password of another user
        DBUG_ASSERT(user->host.str != 0);
3897
        if (strcmp(thd->security_ctx->user, user->user.str) ||
3898
            my_strcasecmp(system_charset_info,
3899
                          user->host.str, thd->security_ctx->host_or_ip))
3900 3901
        {
          // TODO: use check_change_password()
3902 3903
          if (is_acl_user(user->host.str, user->user.str) &&
              user->password.str &&
Marc Alff's avatar
Marc Alff committed
3904
              check_access(thd, UPDATE_ACL, "mysql", NULL, NULL, 1, 1))
3905 3906 3907 3908 3909 3910
          {
            my_message(ER_PASSWORD_NOT_ALLOWED,
                       ER(ER_PASSWORD_NOT_ALLOWED), MYF(0));
            goto error;
          }
        }
unknown's avatar
SCRUM  
unknown committed
3911 3912
      }
    }
unknown's avatar
VIEW  
unknown committed
3913
    if (first_table)
3914
    {
3915 3916
      if (lex->type == TYPE_ENUM_PROCEDURE ||
          lex->type == TYPE_ENUM_FUNCTION)
3917 3918 3919 3920
      {
        uint grants= lex->all_privileges 
		   ? (PROC_ACLS & ~GRANT_ACL) | (lex->grant & GRANT_ACL)
		   : lex->grant;
3921
        if (check_grant_routine(thd, grants | GRANT_ACL, all_tables,
3922
                                lex->type == TYPE_ENUM_PROCEDURE, 0))
3923
	  goto error;
3924
        /* Conditionally writes to binlog */
3925 3926 3927
        res= mysql_routine_grant(thd, all_tables,
                                 lex->type == TYPE_ENUM_PROCEDURE, 
                                 lex->users_list, grants,
3928 3929 3930
                                 lex->sql_command == SQLCOM_REVOKE, TRUE);
        if (!res)
          my_ok(thd);
3931 3932 3933
      }
      else
      {
3934
	if (check_grant(thd,(lex->grant | lex->grant_tot_col | GRANT_ACL),
3935
                        all_tables, FALSE, UINT_MAX, FALSE))
3936
	  goto error;
3937
        /* Conditionally writes to binlog */
3938 3939 3940 3941
        res= mysql_table_grant(thd, all_tables, lex->users_list,
			       lex->columns, lex->grant,
			       lex->sql_command == SQLCOM_REVOKE);
      }
3942 3943 3944
    }
    else
    {
3945
      if (lex->columns.elements || lex->type)
3946
      {
unknown's avatar
unknown committed
3947 3948
	my_message(ER_ILLEGAL_GRANT_FOR_TABLE, ER(ER_ILLEGAL_GRANT_FOR_TABLE),
                   MYF(0));
unknown's avatar
unknown committed
3949
        goto error;
3950 3951
      }
      else
3952
	/* Conditionally writes to binlog */
3953 3954 3955 3956
	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
			  lex->sql_command == SQLCOM_REVOKE);
      if (!res)
      {
3957
	if (lex->sql_command == SQLCOM_GRANT)
3958
	{
unknown's avatar
unknown committed
3959
	  List_iterator <LEX_USER> str_list(lex->users_list);
3960 3961 3962 3963 3964
	  LEX_USER *user, *tmp_user;
	  while ((tmp_user=str_list++))
          {
            if (!(user= get_current_user(thd, tmp_user)))
              goto error;
3965
	    reset_mqh(user, 0);
3966
          }
3967
	}
3968 3969 3970 3971
      }
    }
    break;
  }
unknown's avatar
SCRUM  
unknown committed
3972
#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/
unknown's avatar
unknown committed
3973
  case SQLCOM_RESET:
3974 3975 3976
    /*
      RESET commands are never written to the binary log, so we have to
      initialize this variable because RESET shares the same code as FLUSH
3977 3978 3979 3980
    */
    lex->no_write_to_binlog= 1;
  case SQLCOM_FLUSH:
  {
unknown's avatar
unknown committed
3981
    bool write_to_binlog;
3982

unknown's avatar
unknown committed
3983
    if (check_global_access(thd,RELOAD_ACL))
unknown's avatar
unknown committed
3984
      goto error;
3985

3986 3987 3988 3989 3990 3991 3992 3993
    if (first_table && lex->type & REFRESH_READ_LOCK)
    {
      if (flush_tables_with_read_lock(thd, all_tables))
        goto error;
      my_ok(thd);
      break;
    }

3994 3995 3996 3997
    /*
      reload_acl_and_cache() will tell us if we are allowed to write to the
      binlog or not.
    */
unknown's avatar
unknown committed
3998
    if (!reload_acl_and_cache(thd, lex->type, first_table, &write_to_binlog))
3999 4000 4001 4002 4003
    {
      /*
        We WANT to write and we CAN write.
        ! we write after unlocking the table.
      */
4004 4005 4006
      /*
        Presumably, RESET and binlog writing doesn't require synchronization
      */
4007 4008
      if (!lex->no_write_to_binlog && write_to_binlog)
      {
Davi Arnaut's avatar
Davi Arnaut committed
4009
        if ((res= write_bin_log(thd, FALSE, thd->query(), thd->query_length())))
4010
          break;
4011
      }
4012
      my_ok(thd);
4013 4014
    } 
    
unknown's avatar
unknown committed
4015
    break;
4016
  }
unknown's avatar
unknown committed
4017
  case SQLCOM_KILL:
4018 4019 4020
  {
    Item *it= (Item *)lex->value_list.head();

unknown's avatar
unknown committed
4021 4022 4023 4024 4025 4026 4027
    if (lex->table_or_sp_used())
    {
      my_error(ER_NOT_SUPPORTED_YET, MYF(0), "Usage of subqueries or stored "
               "function calls as part of this statement");
      break;
    }

4028
    if ((!it->fixed && it->fix_fields(lex->thd, &it)) || it->check_cols(1))
4029 4030 4031 4032 4033
    {
      my_message(ER_SET_CONSTANTS_ONLY, ER(ER_SET_CONSTANTS_ONLY),
		 MYF(0));
      goto error;
    }
4034
    sql_kill(thd, (ulong)it->val_int(), lex->type & ONLY_KILL_QUERY);
unknown's avatar
unknown committed
4035
    break;
4036
  }
unknown's avatar
unknown committed
4037
#ifndef NO_EMBEDDED_ACCESS_CHECKS
unknown's avatar
unknown committed
4038
  case SQLCOM_SHOW_GRANTS:
4039 4040 4041 4042
  {
    LEX_USER *grant_user= get_current_user(thd, lex->grant_user);
    if (!grant_user)
      goto error;
4043
    if ((thd->security_ctx->priv_user &&
4044
	 !strcmp(thd->security_ctx->priv_user, grant_user->user.str)) ||
Marc Alff's avatar
Marc Alff committed
4045
        !check_access(thd, SELECT_ACL, "mysql", NULL, NULL, 1, 0))
unknown's avatar
unknown committed
4046
    {
4047
      res = mysql_show_grants(thd, grant_user);
unknown's avatar
unknown committed
4048 4049
    }
    break;
4050
  }
unknown's avatar
unknown committed
4051
#endif
4052
  case SQLCOM_HA_OPEN:
unknown's avatar
VIEW  
unknown committed
4053
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
4054
    if (check_table_access(thd, SELECT_ACL, all_tables, FALSE, UINT_MAX, FALSE))
4055
      goto error;
unknown's avatar
unknown committed
4056
    res= mysql_ha_open(thd, first_table, 0);
4057 4058
    break;
  case SQLCOM_HA_CLOSE:
unknown's avatar
VIEW  
unknown committed
4059 4060
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    res= mysql_ha_close(thd, first_table);
4061 4062
    break;
  case SQLCOM_HA_READ:
unknown's avatar
VIEW  
unknown committed
4063
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
4064 4065 4066 4067 4068
    /*
      There is no need to check for table permissions here, because
      if a user has no permissions to read a table, he won't be
      able to open it (with SQLCOM_HA_OPEN) in the first place.
    */
4069
    unit->set_limit(select_lex);
4070
    res= mysql_ha_read(thd, first_table, lex->ha_read_mode, lex->ident.str,
unknown's avatar
VIEW  
unknown committed
4071
                       lex->insert_list, lex->ha_rkey_mode, select_lex->where,
4072
                       unit->select_limit_cnt, unit->offset_limit_cnt);
4073 4074
    break;

unknown's avatar
unknown committed
4075
  case SQLCOM_BEGIN:
Konstantin Osipov's avatar
Konstantin Osipov committed
4076
    if (trans_begin(thd, lex->start_transaction_opt))
unknown's avatar
unknown committed
4077
      goto error;
4078
    my_ok(thd);
unknown's avatar
unknown committed
4079 4080
    break;
  case SQLCOM_COMMIT:
4081
  {
4082 4083
    DBUG_ASSERT(thd->lock == NULL ||
                thd->locked_tables_mode == LTM_LOCK_TABLES);
4084 4085 4086 4087 4088 4089
    bool tx_chain= (lex->tx_chain == TVL_YES ||
                    (thd->variables.completion_type == 1 &&
                     lex->tx_chain != TVL_NO));
    bool tx_release= (lex->tx_release == TVL_YES ||
                      (thd->variables.completion_type == 2 &&
                       lex->tx_release != TVL_NO));
Konstantin Osipov's avatar
Konstantin Osipov committed
4090 4091
    if (trans_commit(thd))
      goto error;
4092
    thd->mdl_context.release_transactional_locks();
Konstantin Osipov's avatar
Konstantin Osipov committed
4093
    /* Begin transaction with the same isolation level. */
4094 4095 4096
    if (tx_chain)
    {
      if (trans_begin(thd))
unknown's avatar
unknown committed
4097
      goto error;
4098 4099 4100 4101 4102 4103
    }
    else
    {
      /* Reset the isolation level if no chaining transaction. */
      thd->tx_isolation= (enum_tx_isolation) thd->variables.tx_isolation;
    }
Konstantin Osipov's avatar
Konstantin Osipov committed
4104
    /* Disconnect the current client connection. */
4105
    if (tx_release)
Konstantin Osipov's avatar
Konstantin Osipov committed
4106
      thd->killed= THD::KILL_CONNECTION;
4107
    my_ok(thd);
unknown's avatar
unknown committed
4108
    break;
4109
  }
unknown's avatar
unknown committed
4110
  case SQLCOM_ROLLBACK:
4111
  {
4112 4113
    DBUG_ASSERT(thd->lock == NULL ||
                thd->locked_tables_mode == LTM_LOCK_TABLES);
4114 4115 4116 4117 4118 4119
    bool tx_chain= (lex->tx_chain == TVL_YES ||
                    (thd->variables.completion_type == 1 &&
                     lex->tx_chain != TVL_NO));
    bool tx_release= (lex->tx_release == TVL_YES ||
                      (thd->variables.completion_type == 2 &&
                       lex->tx_release != TVL_NO));
Konstantin Osipov's avatar
Konstantin Osipov committed
4120
    if (trans_rollback(thd))
unknown's avatar
unknown committed
4121
      goto error;
4122
    thd->mdl_context.release_transactional_locks();
Konstantin Osipov's avatar
Konstantin Osipov committed
4123
    /* Begin transaction with the same isolation level. */
4124 4125 4126 4127 4128 4129 4130 4131 4132 4133
    if (tx_chain)
    {
      if (trans_begin(thd))
        goto error;
    }
    else
    {
      /* Reset the isolation level if no chaining transaction. */
      thd->tx_isolation= (enum_tx_isolation) thd->variables.tx_isolation;
    }
Konstantin Osipov's avatar
Konstantin Osipov committed
4134
    /* Disconnect the current client connection. */
4135
    if (tx_release)
Konstantin Osipov's avatar
Konstantin Osipov committed
4136
      thd->killed= THD::KILL_CONNECTION;
4137
    my_ok(thd);
unknown's avatar
unknown committed
4138
    break;
4139
  }
unknown's avatar
unknown committed
4140
  case SQLCOM_RELEASE_SAVEPOINT:
Konstantin Osipov's avatar
Konstantin Osipov committed
4141 4142 4143
    if (trans_release_savepoint(thd, lex->ident))
      goto error;
    my_ok(thd);
unknown's avatar
unknown committed
4144
    break;
unknown's avatar
unknown committed
4145
  case SQLCOM_ROLLBACK_TO_SAVEPOINT:
Konstantin Osipov's avatar
Konstantin Osipov committed
4146 4147 4148
    if (trans_rollback_to_savepoint(thd, lex->ident))
      goto error;
    my_ok(thd);
unknown's avatar
unknown committed
4149
    break;
4150
  case SQLCOM_SAVEPOINT:
Konstantin Osipov's avatar
Konstantin Osipov committed
4151 4152 4153
    if (trans_savepoint(thd, lex->ident))
      goto error;
    my_ok(thd);
unknown's avatar
unknown committed
4154
    break;
4155 4156
  case SQLCOM_CREATE_PROCEDURE:
  case SQLCOM_CREATE_SPFUNCTION:
unknown's avatar
unknown committed
4157
  {
4158
    uint namelen;
unknown's avatar
unknown committed
4159
    char *name;
unknown's avatar
unknown committed
4160
    int sp_result= SP_INTERNAL_ERROR;
4161

4162
    DBUG_ASSERT(lex->sphead != 0);
unknown's avatar
unknown committed
4163
    DBUG_ASSERT(lex->sphead->m_db.str); /* Must be initialized in the parser */
4164 4165 4166 4167
    /*
      Verify that the database name is allowed, optionally
      lowercase it.
    */
4168
    if (check_db_name(&lex->sphead->m_db))
4169
    {
4170
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->sphead->m_db.str);
4171
      goto create_sp_error;
4172 4173
    }

4174
    /*
4175 4176 4177
      Check that a database directory with this name
      exists. Design note: This won't work on virtual databases
      like information_schema.
4178 4179
    */
    if (check_db_dir_existence(lex->sphead->m_db.str))
4180
    {
4181
      my_error(ER_BAD_DB_ERROR, MYF(0), lex->sphead->m_db.str);
4182
      goto create_sp_error;
4183
    }
4184

Marc Alff's avatar
Marc Alff committed
4185 4186
    if (check_access(thd, CREATE_PROC_ACL, lex->sphead->m_db.str,
                     NULL, NULL, 0, 0))
4187
      goto create_sp_error;
4188 4189

    name= lex->sphead->name(&namelen);
4190
#ifdef HAVE_DLOPEN
unknown's avatar
unknown committed
4191 4192 4193
    if (lex->sphead->m_type == TYPE_ENUM_FUNCTION)
    {
      udf_func *udf = find_udf(name, namelen);
4194

unknown's avatar
unknown committed
4195
      if (udf)
4196
      {
4197 4198
        my_error(ER_UDF_EXISTS, MYF(0), name);
        goto create_sp_error;
4199
      }
unknown's avatar
unknown committed
4200 4201 4202
    }
#endif

4203 4204
    if (sp_process_definer(thd))
      goto create_sp_error;
4205

Konstantin Osipov's avatar
Konstantin Osipov committed
4206
    res= (sp_result= sp_create_routine(thd, lex->sphead->m_type, lex->sphead));
unknown's avatar
unknown committed
4207
    switch (sp_result) {
4208
    case SP_OK: {
unknown's avatar
unknown committed
4209
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4210
      /* only add privileges if really neccessary */
4211 4212 4213 4214 4215

      Security_context security_context;
      bool restore_backup_context= false;
      Security_context *backup= NULL;
      LEX_USER *definer= thd->lex->definer;
Konstantin Osipov's avatar
Konstantin Osipov committed
4216 4217 4218 4219 4220 4221 4222 4223 4224 4225
      /*
        We're going to issue an implicit GRANT statement.
        It takes metadata locks and updates system tables.
        Make sure that sp_create_routine() did not leave any
        locks in the MDL context, so there is no risk to
        deadlock.
      */
      trans_commit_implicit(thd);
      close_thread_tables(thd);
      thd->mdl_context.release_transactional_locks();
4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243
      /*
        Check if the definer exists on slave, 
        then use definer privilege to insert routine privileges to mysql.procs_priv.

        For current user of SQL thread has GLOBAL_ACL privilege, 
        which doesn't any check routine privileges, 
        so no routine privilege record  will insert into mysql.procs_priv.
      */
      if (thd->slave_thread && is_acl_user(definer->host.str, definer->user.str))
      {
        security_context.change_security_context(thd, 
                                                 &thd->lex->definer->user,
                                                 &thd->lex->definer->host,
                                                 &thd->lex->sphead->m_db,
                                                 &backup);
        restore_backup_context= true;
      }

4244
      if (sp_automatic_privileges && !opt_noacl &&
4245
          check_routine_access(thd, DEFAULT_CREATE_PROC_ACLS,
4246
                               lex->sphead->m_db.str, name,
4247
                               lex->sql_command == SQLCOM_CREATE_PROCEDURE, 1))
4248
      {
unknown's avatar
unknown committed
4249
        if (sp_grant_privileges(thd, lex->sphead->m_db.str, name,
4250
                                lex->sql_command == SQLCOM_CREATE_PROCEDURE))
4251 4252 4253
          push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                       ER_PROC_AUTO_GRANT_FAIL,
                       ER(ER_PROC_AUTO_GRANT_FAIL));
4254
      }
4255 4256 4257 4258 4259 4260 4261 4262 4263 4264

      /*
        Restore current user with GLOBAL_ACL privilege of SQL thread
      */ 
      if (restore_backup_context)
      {
        DBUG_ASSERT(thd->slave_thread == 1);
        thd->security_ctx->restore_security_context(thd, backup);
      }

unknown's avatar
unknown committed
4265
#endif
unknown's avatar
unknown committed
4266
    break;
4267
    }
4268 4269 4270 4271 4272 4273 4274 4275 4276
    case SP_WRITE_ROW_FAILED:
      my_error(ER_SP_ALREADY_EXISTS, MYF(0), SP_TYPE_STRING(lex), name);
    break;
    case SP_BAD_IDENTIFIER:
      my_error(ER_TOO_LONG_IDENT, MYF(0), name);
    break;
    case SP_BODY_TOO_LONG:
      my_error(ER_TOO_LONG_BODY, MYF(0), name);
    break;
4277 4278 4279
    case SP_FLD_STORE_FAILED:
      my_error(ER_CANT_CREATE_SROUTINE, MYF(0), name);
      break;
4280 4281 4282 4283 4284 4285 4286 4287 4288 4289
    default:
      my_error(ER_SP_STORE_FAILED, MYF(0), SP_TYPE_STRING(lex), name);
    break;
    } /* end switch */

    /*
      Capture all errors within this CASE and
      clean up the environment.
    */
create_sp_error:
unknown's avatar
unknown committed
4290
    if (sp_result != SP_OK )
4291
      goto error;
4292
    my_ok(thd);
4293 4294
    break; /* break super switch */
  } /* end case group bracket */
4295 4296 4297
  case SQLCOM_CALL:
    {
      sp_head *sp;
4298 4299 4300 4301
      /*
        This will cache all SP and SF and open and lock all tables
        required for execution.
      */
4302 4303
      if (check_table_access(thd, SELECT_ACL, all_tables, FALSE,
                             UINT_MAX, FALSE) ||
4304
          open_and_lock_tables(thd, all_tables, TRUE, 0))
4305 4306 4307
       goto error;

      /*
4308 4309
        By this moment all needed SPs should be in cache so no need to look 
        into DB. 
4310
      */
4311 4312
      if (!(sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname,
                                &thd->sp_proc_cache, TRUE)))
4313
      {
4314
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "PROCEDURE",
unknown's avatar
unknown committed
4315
                 lex->spname->m_qname.str);
4316
	goto error;
4317 4318 4319
      }
      else
      {
unknown's avatar
unknown committed
4320
	ha_rows select_limit;
unknown's avatar
unknown committed
4321 4322
        /* bits that should be cleared in thd->server_status */
	uint bits_to_be_cleared= 0;
4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334
        /*
          Check that the stored procedure doesn't contain Dynamic SQL
          and doesn't return result sets: such stored procedures can't
          be called from a function or trigger.
        */
        if (thd->in_sub_stmt)
        {
          const char *where= (thd->in_sub_stmt & SUB_STMT_TRIGGER ?
                              "trigger" : "function");
          if (sp->is_not_allowed_in_function(where))
            goto error;
        }
4335

4336
	if (sp->m_flags & sp_head::MULTI_RESULTS)
4337
	{
4338
	  if (! (thd->client_capabilities & CLIENT_MULTI_RESULTS))
4339
	  {
4340 4341 4342 4343
            /*
              The client does not support multiple result sets being sent
              back
            */
4344
	    my_error(ER_SP_BADSELECT, MYF(0), sp->m_qname.str);
4345 4346
	    goto error;
	  }
unknown's avatar
unknown committed
4347 4348 4349 4350 4351 4352 4353
          /*
            If SERVER_MORE_RESULTS_EXISTS is not set,
            then remember that it should be cleared
          */
	  bits_to_be_cleared= (~thd->server_status &
                               SERVER_MORE_RESULTS_EXISTS);
	  thd->server_status|= SERVER_MORE_RESULTS_EXISTS;
4354 4355
	}

4356
	if (check_routine_access(thd, EXECUTE_ACL,
4357
				 sp->m_db.str, sp->m_name.str, TRUE, FALSE))
4358 4359 4360
	{
	  goto error;
	}
unknown's avatar
unknown committed
4361 4362
	select_limit= thd->variables.select_limit;
	thd->variables.select_limit= HA_POS_ERROR;
4363

4364
        /* 
4365
          We never write CALL statements into binlog:
4366 4367 4368 4369 4370
           - If the mode is non-prelocked, each statement will be logged
             separately.
           - If the mode is prelocked, the invoking statement will care
             about writing into binlog.
          So just execute the statement.
4371
        */
4372
	res= sp->execute_procedure(thd, &lex->value_list);
4373

unknown's avatar
unknown committed
4374
	thd->variables.select_limit= select_limit;
4375

unknown's avatar
unknown committed
4376
        thd->server_status&= ~bits_to_be_cleared;
4377

unknown's avatar
unknown committed
4378
	if (!res)
4379 4380 4381
        {
          my_ok(thd, (thd->get_row_count_func() < 0) ? 0 : thd->get_row_count_func());
        }
4382
	else
4383
        {
4384
          DBUG_ASSERT(thd->is_error() || thd->killed);
4385
	  goto error;		// Substatement should already have sent error
4386
        }
4387
      }
4388
      break;
4389 4390
    }
  case SQLCOM_ALTER_PROCEDURE:
4391
  case SQLCOM_ALTER_FUNCTION:
4392
    {
unknown's avatar
unknown committed
4393
      int sp_result;
Konstantin Osipov's avatar
Konstantin Osipov committed
4394 4395
      int type= (lex->sql_command == SQLCOM_ALTER_PROCEDURE ?
                 TYPE_ENUM_PROCEDURE : TYPE_ENUM_FUNCTION);
unknown's avatar
unknown committed
4396

Konstantin Osipov's avatar
Konstantin Osipov committed
4397 4398 4399 4400
      if (check_routine_access(thd, ALTER_PROC_ACL, lex->spname->m_db.str,
                               lex->spname->m_name.str,
                               lex->sql_command == SQLCOM_ALTER_PROCEDURE, 0))
        goto error;
unknown's avatar
unknown committed
4401

Konstantin Osipov's avatar
Konstantin Osipov committed
4402 4403 4404 4405 4406 4407 4408 4409
      /*
        Note that if you implement the capability of ALTER FUNCTION to
        alter the body of the function, this command should be made to
        follow the restrictions that log-bin-trust-function-creators=0
        already puts on CREATE FUNCTION.
      */
      /* Conditionally writes to binlog */
      sp_result= sp_update_routine(thd, type, lex->spname, &lex->sp_chistics);
unknown's avatar
unknown committed
4410
      switch (sp_result)
4411
      {
unknown's avatar
unknown committed
4412
      case SP_OK:
4413
	my_ok(thd);
unknown's avatar
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4414 4415
	break;
      case SP_KEY_NOT_FOUND:
4416 4417
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
unknown's avatar
unknown committed
4418 4419
	goto error;
      default:
4420 4421
	my_error(ER_SP_CANT_ALTER, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
unknown's avatar
unknown committed
4422
	goto error;
4423
      }
4424
      break;
4425 4426
    }
  case SQLCOM_DROP_PROCEDURE:
4427
  case SQLCOM_DROP_FUNCTION:
4428
    {
4429 4430 4431 4432 4433 4434 4435 4436 4437 4438 4439 4440 4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 4451 4452 4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466 4467 4468 4469
#ifdef HAVE_DLOPEN
      if (lex->sql_command == SQLCOM_DROP_FUNCTION &&
          ! lex->spname->m_explicit_name)
      {
        /* DROP FUNCTION <non qualified name> */
        udf_func *udf = find_udf(lex->spname->m_name.str,
                                 lex->spname->m_name.length);
        if (udf)
        {
          if (check_access(thd, DELETE_ACL, "mysql", NULL, NULL, 1, 0))
            goto error;

          if (!(res = mysql_drop_function(thd, &lex->spname->m_name)))
          {
            my_ok(thd);
            break;
          }
          my_error(ER_SP_DROP_FAILED, MYF(0),
                   "FUNCTION (UDF)", lex->spname->m_name.str);
          goto error;
        }

        if (lex->spname->m_db.str == NULL)
        {
          if (lex->drop_if_exists)
          {
            push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
                                ER_SP_DOES_NOT_EXIST, ER(ER_SP_DOES_NOT_EXIST),
                                "FUNCTION (UDF)", lex->spname->m_name.str);
            res= FALSE;
            my_ok(thd);
            break;
          }
          my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                   "FUNCTION (UDF)", lex->spname->m_name.str);
          goto error;
        }
        /* Fall thought to test for a stored function */
      }
#endif

unknown's avatar
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4470
      int sp_result;
4471 4472
      int type= (lex->sql_command == SQLCOM_DROP_PROCEDURE ?
                 TYPE_ENUM_PROCEDURE : TYPE_ENUM_FUNCTION);
4473

Konstantin Osipov's avatar
Konstantin Osipov committed
4474 4475 4476 4477 4478 4479
      /*
        @todo: here we break the metadata locking protocol by
        looking up the information about the routine without
        a metadata lock. Rewrite this piece to make sp_drop_routine
        return whether the routine existed or not.
      */
unknown's avatar
unknown committed
4480
      sp_result= sp_routine_exists_in_table(thd, type, lex->spname);
Marc Alff's avatar
Marc Alff committed
4481
      thd->warning_info->opt_clear_warning_info(thd->query_id);
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unknown committed
4482
      if (sp_result == SP_OK)
4483
      {
4484 4485 4486
        char *db= lex->spname->m_db.str;
	char *name= lex->spname->m_name.str;

4487 4488
	if (check_routine_access(thd, ALTER_PROC_ACL, db, name,
                                 lex->sql_command == SQLCOM_DROP_PROCEDURE, 0))
unknown's avatar
merge  
unknown committed
4489
          goto error;
4490

Konstantin Osipov's avatar
Konstantin Osipov committed
4491 4492
        /* Conditionally writes to binlog */
        sp_result= sp_drop_routine(thd, type, lex->spname);
4493

Konstantin Osipov's avatar
Konstantin Osipov committed
4494 4495 4496 4497 4498 4499 4500 4501 4502
#ifndef NO_EMBEDDED_ACCESS_CHECKS
        /*
          We're going to issue an implicit REVOKE statement.
          It takes metadata locks and updates system tables.
          Make sure that sp_create_routine() did not leave any
          locks in the MDL context, so there is no risk to
          deadlock.
        */
        trans_commit_implicit(thd);
4503
        close_thread_tables(thd);
4504
        thd->mdl_context.release_transactional_locks();
4505

4506 4507
        if (sp_automatic_privileges && !opt_noacl &&
            sp_revoke_privileges(thd, db, name,
4508
                                 lex->sql_command == SQLCOM_DROP_PROCEDURE))
4509 4510 4511 4512 4513 4514 4515
        {
          push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                       ER_PROC_AUTO_REVOKE_FAIL,
                       ER(ER_PROC_AUTO_REVOKE_FAIL));
          /* If this happens, an error should have been reported. */
          goto error;
        }
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4516
#endif
4517
      }
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4518 4519
      res= sp_result;
      switch (sp_result) {
4520
      case SP_OK:
4521
	my_ok(thd);
4522 4523
	break;
      case SP_KEY_NOT_FOUND:
4524 4525
	if (lex->drop_if_exists)
	{
4526
          res= write_bin_log(thd, TRUE, thd->query(), thd->query_length());
4527
	  push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
4528
			      ER_SP_DOES_NOT_EXIST, ER(ER_SP_DOES_NOT_EXIST),
4529
                              SP_COM_STRING(lex), lex->spname->m_qname.str);
4530 4531
          if (!res)
            my_ok(thd);
4532 4533
	  break;
	}
4534 4535
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4536 4537
	goto error;
      default:
4538 4539
	my_error(ER_SP_DROP_FAILED, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4540
	goto error;
4541
      }
4542
      break;
4543
    }
unknown's avatar
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4544 4545
  case SQLCOM_SHOW_CREATE_PROC:
    {
unknown's avatar
unknown committed
4546
      if (sp_show_create_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname))
Konstantin Osipov's avatar
Konstantin Osipov committed
4547
        goto error;
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unknown committed
4548 4549 4550 4551
      break;
    }
  case SQLCOM_SHOW_CREATE_FUNC:
    {
unknown's avatar
unknown committed
4552
      if (sp_show_create_routine(thd, TYPE_ENUM_FUNCTION, lex->spname))
unknown's avatar
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4553 4554 4555
	goto error;
      break;
    }
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unknown committed
4556 4557 4558
  case SQLCOM_SHOW_PROC_CODE:
  case SQLCOM_SHOW_FUNC_CODE:
    {
4559
#ifndef DBUG_OFF
unknown's avatar
unknown committed
4560
      sp_head *sp;
Konstantin Osipov's avatar
Konstantin Osipov committed
4561 4562
      int type= (lex->sql_command == SQLCOM_SHOW_PROC_CODE ?
                 TYPE_ENUM_PROCEDURE : TYPE_ENUM_FUNCTION);
unknown's avatar
unknown committed
4563

Konstantin Osipov's avatar
Konstantin Osipov committed
4564 4565
      if (sp_cache_routine(thd, type, lex->spname, FALSE, &sp))
        goto error;
4566
      if (!sp || sp->show_routine_code(thd))
4567 4568
      {
        /* We don't distinguish between errors for now */
unknown's avatar
unknown committed
4569 4570 4571 4572 4573
        my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
        goto error;
      }
      break;
4574 4575 4576 4577
#else
      my_error(ER_FEATURE_DISABLED, MYF(0),
               "SHOW PROCEDURE|FUNCTION CODE", "--with-debug");
      goto error;
unknown's avatar
unknown committed
4578
#endif // ifndef DBUG_OFF
4579
    }
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4580 4581 4582 4583 4584 4585 4586 4587 4588 4589 4590 4591 4592
  case SQLCOM_SHOW_CREATE_TRIGGER:
    {
      if (lex->spname->m_name.length > NAME_LEN)
      {
        my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str);
        goto error;
      }

      if (show_create_trigger(thd, lex->spname))
        goto error; /* Error has been already logged. */

      break;
    }
unknown's avatar
VIEW  
unknown committed
4593 4594
  case SQLCOM_CREATE_VIEW:
    {
4595 4596 4597 4598
      /*
        Note: SQLCOM_CREATE_VIEW also handles 'ALTER VIEW' commands
        as specified through the thd->lex->create_view_mode flag.
      */
4599
      res= mysql_create_view(thd, first_table, thd->lex->create_view_mode);
unknown's avatar
VIEW  
unknown committed
4600 4601 4602 4603
      break;
    }
  case SQLCOM_DROP_VIEW:
    {
Konstantin Osipov's avatar
Konstantin Osipov committed
4604
      if (check_table_access(thd, DROP_ACL, all_tables, FALSE, UINT_MAX, FALSE))
unknown's avatar
unknown committed
4605
        goto error;
4606 4607
      /* Conditionally writes to binlog. */
      res= mysql_drop_view(thd, first_table, thd->lex->drop_mode);
unknown's avatar
VIEW  
unknown committed
4608 4609
      break;
    }
4610 4611
  case SQLCOM_CREATE_TRIGGER:
  {
4612
    /* Conditionally writes to binlog. */
4613 4614
    res= mysql_create_or_drop_trigger(thd, all_tables, 1);

4615 4616 4617 4618
    break;
  }
  case SQLCOM_DROP_TRIGGER:
  {
4619
    /* Conditionally writes to binlog. */
4620 4621 4622
    res= mysql_create_or_drop_trigger(thd, all_tables, 0);
    break;
  }
4623
  case SQLCOM_XA_START:
Konstantin Osipov's avatar
Konstantin Osipov committed
4624 4625
    if (trans_xa_start(thd))
      goto error;
4626
    my_ok(thd);
4627 4628
    break;
  case SQLCOM_XA_END:
Konstantin Osipov's avatar
Konstantin Osipov committed
4629 4630
    if (trans_xa_end(thd))
      goto error;
4631
    my_ok(thd);
4632 4633
    break;
  case SQLCOM_XA_PREPARE:
Konstantin Osipov's avatar
Konstantin Osipov committed
4634 4635
    if (trans_xa_prepare(thd))
      goto error;
4636
    my_ok(thd);
4637 4638
    break;
  case SQLCOM_XA_COMMIT:
Konstantin Osipov's avatar
Konstantin Osipov committed
4639 4640
    if (trans_xa_commit(thd))
      goto error;
4641
    thd->mdl_context.release_transactional_locks();
4642 4643 4644 4645 4646
    /*
      We've just done a commit, reset transaction
      isolation level to the session default.
    */
    thd->tx_isolation= (enum_tx_isolation) thd->variables.tx_isolation;
Konstantin Osipov's avatar
Konstantin Osipov committed
4647
    my_ok(thd);
4648 4649
    break;
  case SQLCOM_XA_ROLLBACK:
Konstantin Osipov's avatar
Konstantin Osipov committed
4650 4651
    if (trans_xa_rollback(thd))
      goto error;
4652
    thd->mdl_context.release_transactional_locks();
4653 4654 4655 4656 4657
    /*
      We've just done a rollback, reset transaction
      isolation level to the session default.
    */
    thd->tx_isolation= (enum_tx_isolation) thd->variables.tx_isolation;
Konstantin Osipov's avatar
Konstantin Osipov committed
4658
    my_ok(thd);
4659 4660
    break;
  case SQLCOM_XA_RECOVER:
4661
    res= mysql_xa_recover(thd);
4662
    break;
unknown's avatar
unknown committed
4663
  case SQLCOM_ALTER_TABLESPACE:
4664
    if (check_global_access(thd, CREATE_TABLESPACE_ACL))
unknown's avatar
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4665 4666
      break;
    if (!(res= mysql_alter_tablespace(thd, lex->alter_tablespace_info)))
4667
      my_ok(thd);
unknown's avatar
unknown committed
4668 4669 4670 4671
    break;
  case SQLCOM_INSTALL_PLUGIN:
    if (! (res= mysql_install_plugin(thd, &thd->lex->comment,
                                     &thd->lex->ident)))
4672
      my_ok(thd);
unknown's avatar
unknown committed
4673 4674 4675
    break;
  case SQLCOM_UNINSTALL_PLUGIN:
    if (! (res= mysql_uninstall_plugin(thd, &thd->lex->comment)))
4676
      my_ok(thd);
unknown's avatar
unknown committed
4677 4678 4679 4680 4681 4682 4683 4684 4685 4686
    break;
  case SQLCOM_BINLOG_BASE64_EVENT:
  {
#ifndef EMBEDDED_LIBRARY
    mysql_client_binlog_statement(thd);
#else /* EMBEDDED_LIBRARY */
    my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "embedded");
#endif /* EMBEDDED_LIBRARY */
    break;
  }
unknown's avatar
unknown committed
4687 4688 4689 4690 4691
  case SQLCOM_CREATE_SERVER:
  {
    int error;
    LEX *lex= thd->lex;
    DBUG_PRINT("info", ("case SQLCOM_CREATE_SERVER"));
unknown's avatar
unknown committed
4692 4693 4694 4695

    if (check_global_access(thd, SUPER_ACL))
      break;

unknown's avatar
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4696 4697
    if ((error= create_server(thd, &lex->server_options)))
    {
4698
      DBUG_PRINT("info", ("problem creating server <%s>",
unknown's avatar
unknown committed
4699 4700 4701 4702
                          lex->server_options.server_name));
      my_error(error, MYF(0), lex->server_options.server_name);
      break;
    }
4703
    my_ok(thd, 1);
unknown's avatar
unknown committed
4704 4705 4706 4707 4708 4709 4710
    break;
  }
  case SQLCOM_ALTER_SERVER:
  {
    int error;
    LEX *lex= thd->lex;
    DBUG_PRINT("info", ("case SQLCOM_ALTER_SERVER"));
unknown's avatar
unknown committed
4711 4712 4713 4714

    if (check_global_access(thd, SUPER_ACL))
      break;

unknown's avatar
unknown committed
4715 4716
    if ((error= alter_server(thd, &lex->server_options)))
    {
4717
      DBUG_PRINT("info", ("problem altering server <%s>",
unknown's avatar
unknown committed
4718 4719 4720 4721
                          lex->server_options.server_name));
      my_error(error, MYF(0), lex->server_options.server_name);
      break;
    }
4722
    my_ok(thd, 1);
unknown's avatar
unknown committed
4723 4724 4725 4726 4727 4728 4729
    break;
  }
  case SQLCOM_DROP_SERVER:
  {
    int err_code;
    LEX *lex= thd->lex;
    DBUG_PRINT("info", ("case SQLCOM_DROP_SERVER"));
unknown's avatar
unknown committed
4730 4731 4732 4733

    if (check_global_access(thd, SUPER_ACL))
      break;

unknown's avatar
unknown committed
4734 4735
    if ((err_code= drop_server(thd, &lex->server_options)))
    {
unknown's avatar
unknown committed
4736
      if (! lex->drop_if_exists && err_code == ER_FOREIGN_SERVER_DOESNT_EXIST)
unknown's avatar
unknown committed
4737 4738 4739 4740 4741 4742 4743
      {
        DBUG_PRINT("info", ("problem dropping server %s",
                            lex->server_options.server_name));
        my_error(err_code, MYF(0), lex->server_options.server_name);
      }
      else
      {
4744
        my_ok(thd, 0);
unknown's avatar
unknown committed
4745 4746 4747
      }
      break;
    }
4748
    my_ok(thd, 1);
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4749 4750
    break;
  }
Marc Alff's avatar
Marc Alff committed
4751 4752 4753 4754 4755
  case SQLCOM_SIGNAL:
  case SQLCOM_RESIGNAL:
    DBUG_ASSERT(lex->m_stmt != NULL);
    res= lex->m_stmt->execute(thd);
    break;
4756
  default:
4757
#ifndef EMBEDDED_LIBRARY
4758
    DBUG_ASSERT(0);                             /* Impossible */
4759
#endif
4760
    my_ok(thd);
unknown's avatar
unknown committed
4761 4762
    break;
  }
4763
  thd_proc_info(thd, "query end");
4764 4765

  /*
unknown's avatar
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4766
    Binlog-related cleanup:
4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 4777
    Reset system variables temporarily modified by SET ONE SHOT.

    Exception: If this is a SET, do nothing. This is to allow
    mysqlbinlog to print many SET commands (in this case we want the
    charset temp setting to live until the real query). This is also
    needed so that SET CHARACTER_SET_CLIENT... does not cancel itself
    immediately.
  */
  if (thd->one_shot_set && lex->sql_command != SQLCOM_SET_OPTION)
    reset_one_shot_variables(thd);

4778
  goto finish;
unknown's avatar
unknown committed
4779 4780

error:
4781 4782
  res= TRUE;

4783
finish:
4784
  if (thd->global_read_lock.has_protection())
4785 4786 4787 4788 4789
  {
    /*
      Release the protection against the global read lock and wake
      everyone, who might want to set a global read lock.
    */
4790
    thd->global_read_lock.start_waiting_global_read_lock(thd);
4791
  }
Konstantin Osipov's avatar
Konstantin Osipov committed
4792

4793 4794 4795
  DBUG_ASSERT(!thd->in_active_multi_stmt_transaction() ||
               thd->in_multi_stmt_transaction_mode());

4796 4797 4798 4799 4800 4801 4802 4803
  if (stmt_causes_implicit_commit(thd, CF_IMPLICIT_COMMIT_END))
  {
    /* If commit fails, we should be able to reset the OK status. */
    thd->stmt_da->can_overwrite_status= TRUE;
    /* Commit or rollback the statement transaction. */
    thd->is_error() ? trans_rollback_stmt(thd) : trans_commit_stmt(thd);
    /* Commit the normal transaction if one is active. */
    trans_commit_implicit(thd);
4804
    thd->stmt_da->can_overwrite_status= FALSE;
4805 4806
    /* Close tables and release metadata locks. */
    close_thread_tables(thd);
4807
    thd->mdl_context.release_transactional_locks();
4808
  }
Konstantin Osipov's avatar
Konstantin Osipov committed
4809

4810
  DBUG_RETURN(res || thd->is_error());
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4811 4812 4813
}


4814 4815 4816 4817 4818 4819 4820 4821 4822 4823 4824 4825
static bool execute_sqlcom_select(THD *thd, TABLE_LIST *all_tables)
{
  LEX	*lex= thd->lex;
  select_result *result=lex->result;
  bool res;
  /* assign global limit variable if limit is not given */
  {
    SELECT_LEX *param= lex->unit.global_parameters;
    if (!param->explicit_limit)
      param->select_limit=
        new Item_int((ulonglong) thd->variables.select_limit);
  }
4826
  if (!(res= open_and_lock_tables(thd, all_tables, TRUE, 0)))
4827 4828 4829 4830 4831 4832 4833 4834 4835 4836
  {
    if (lex->describe)
    {
      /*
        We always use select_send for EXPLAIN, even if it's an EXPLAIN
        for SELECT ... INTO OUTFILE: a user application should be able
        to prepend EXPLAIN to any query and receive output for it,
        even if the query itself redirects the output.
      */
      if (!(result= new select_send()))
4837
        return 1;                               /* purecov: inspected */
4838 4839 4840 4841 4842 4843 4844
      thd->send_explain_fields(result);
      res= mysql_explain_union(thd, &thd->lex->unit, result);
      if (lex->describe & DESCRIBE_EXTENDED)
      {
        char buff[1024];
        String str(buff,(uint32) sizeof(buff), system_charset_info);
        str.length(0);
4845
        thd->lex->unit.print(&str, QT_ORDINARY);
4846 4847 4848 4849
        str.append('\0');
        push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
                     ER_YES, str.ptr());
      }
4850 4851 4852 4853
      if (res)
        result->abort();
      else
        result->send_eof();
4854 4855 4856 4857 4858
      delete result;
    }
    else
    {
      if (!result && !(result= new select_send()))
4859
        return 1;                               /* purecov: inspected */
4860 4861 4862 4863 4864 4865 4866 4867 4868 4869
      query_cache_store_query(thd, all_tables);
      res= handle_select(thd, lex, result, 0);
      if (result != lex->result)
        delete result;
    }
  }
  return res;
}


unknown's avatar
unknown committed
4870
#ifndef NO_EMBEDDED_ACCESS_CHECKS
unknown's avatar
unknown committed
4871
/**
4872
  Check grants for commands which work only with one table.
unknown's avatar
unknown committed
4873

4874 4875 4876
  @param thd                    Thread handler
  @param privilege              requested privilege
  @param all_tables             global table list of query
unknown's avatar
unknown committed
4877
  @param no_errors              FALSE/TRUE - report/don't report error to
4878
                            the client (using my_error() call).
unknown's avatar
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4879 4880 4881 4882 4883

  @retval
    0   OK
  @retval
    1   access denied, error is sent to client
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unknown committed
4884 4885
*/

4886
bool check_single_table_access(THD *thd, ulong privilege, 
4887
                               TABLE_LIST *all_tables, bool no_errors)
unknown's avatar
unknown committed
4888
{
4889 4890 4891 4892 4893 4894
  Security_context * backup_ctx= thd->security_ctx;

  /* we need to switch to the saved context (if any) */
  if (all_tables->security_ctx)
    thd->security_ctx= all_tables->security_ctx;

4895 4896 4897 4898 4899 4900 4901 4902
  const char *db_name;
  if ((all_tables->view || all_tables->field_translation) &&
      !all_tables->schema_table)
    db_name= all_tables->view_db.str;
  else
    db_name= all_tables->db;

  if (check_access(thd, privilege, db_name,
Marc Alff's avatar
Marc Alff committed
4903 4904 4905
                   &all_tables->grant.privilege,
                   &all_tables->grant.m_internal,
                   0, no_errors))
4906
    goto deny;
unknown's avatar
unknown committed
4907

unknown's avatar
unknown committed
4908
  /* Show only 1 table for check_grant */
4909
  if (!(all_tables->belong_to_view &&
4910
        (thd->lex->sql_command == SQLCOM_SHOW_FIELDS)) &&
4911
      check_grant(thd, privilege, all_tables, FALSE, 1, no_errors))
4912 4913 4914
    goto deny;

  thd->security_ctx= backup_ctx;
4915 4916 4917 4918 4919 4920 4921
  return 0;

deny:
  thd->security_ctx= backup_ctx;
  return 1;
}

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4922
/**
4923 4924 4925
  Check grants for commands which work only with one table and all other
  tables belonging to subselects or implicitly opened tables.

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4926 4927 4928 4929 4930 4931 4932 4933
  @param thd			Thread handler
  @param privilege		requested privilege
  @param all_tables		global table list of query

  @retval
    0   OK
  @retval
    1   access denied, error is sent to client
4934 4935 4936 4937
*/

bool check_one_table_access(THD *thd, ulong privilege, TABLE_LIST *all_tables)
{
4938
  if (check_single_table_access (thd,privilege,all_tables, FALSE))
4939
    return 1;
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4940

4941
  /* Check rights on tables of subselects and implictly opened tables */
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4942
  TABLE_LIST *subselects_tables, *view= all_tables->view ? all_tables : 0;
unknown's avatar
VIEW  
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4943
  if ((subselects_tables= all_tables->next_global))
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4944
  {
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4945 4946 4947 4948 4949 4950
    /*
      Access rights asked for the first table of a view should be the same
      as for the view
    */
    if (view && subselects_tables->belong_to_view == view)
    {
4951
      if (check_single_table_access (thd, privilege, subselects_tables, FALSE))
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4952 4953 4954 4955
        return 1;
      subselects_tables= subselects_tables->next_global;
    }
    if (subselects_tables &&
4956 4957
        (check_table_access(thd, SELECT_ACL, subselects_tables, FALSE,
                            UINT_MAX, FALSE)))
4958
      return 1;
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4959 4960
  }
  return 0;
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4961 4962 4963
}


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4964
/**
4965 4966 4967 4968 4969 4970
  @brief Compare requested privileges with the privileges acquired from the
    User- and Db-tables.
  @param thd          Thread handler
  @param want_access  The requested access privileges.
  @param db           A pointer to the Db name.
  @param[out] save_priv A pointer to the granted privileges will be stored.
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4971
  @param grant_internal_info A pointer to the internal grant cache.
4972 4973 4974 4975 4976 4977 4978 4979
  @param dont_check_global_grants True if no global grants are checked.
  @param no_error     True if no errors should be sent to the client.

  'save_priv' is used to save the User-table (global) and Db-table grants for
  the supplied db name. Note that we don't store db level grants if the global
  grants is enough to satisfy the request AND the global grants contains a
  SELECT grant.

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4980 4981
  For internal databases (INFORMATION_SCHEMA, PERFORMANCE_SCHEMA),
  additional rules apply, see ACL_internal_schema_access.
4982 4983 4984 4985 4986 4987 4988

  @see check_grant

  @return Status of denial of access by exclusive ACLs.
    @retval FALSE Access can't exclusively be denied by Db- and User-table
      access unless Column- and Table-grants are checked too.
    @retval TRUE Access denied.
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4989
*/
4990

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4991
bool
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4992
check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
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4993 4994
             GRANT_INTERNAL_INFO *grant_internal_info,
             bool dont_check_global_grants, bool no_errors)
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4995
{
4996
  Security_context *sctx= thd->security_ctx;
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4997
  ulong db_access;
4998

4999 5000 5001 5002 5003
  /*
    GRANT command:
    In case of database level grant the database name may be a pattern,
    in case of table|column level grant the database name can not be a pattern.
    We use 'dont_check_global_grants' as a flag to determine
5004
    if it's database level grant command
5005 5006 5007
    (see SQLCOM_GRANT case, mysql_execute_command() function) and
    set db_is_pattern according to 'dont_check_global_grants' value.
  */
5008
  bool  db_is_pattern= ((want_access & GRANT_ACL) && dont_check_global_grants);
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5009
  ulong dummy;
5010 5011
  DBUG_ENTER("check_access");
  DBUG_PRINT("enter",("db: %s  want_access: %lu  master_access: %lu",
5012
                      db ? db : "", want_access, sctx->master_access));
5013

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5014 5015 5016
  if (save_priv)
    *save_priv=0;
  else
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5017
  {
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5018
    save_priv= &dummy;
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5019 5020
    dummy= 0;
  }
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5021

5022
  thd_proc_info(thd, "checking permissions");
5023
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
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5024
  {
5025
    DBUG_PRINT("error",("No database"));
5026
    if (!no_errors)
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5027 5028
      my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR),
                 MYF(0));                       /* purecov: tested */
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5029
    DBUG_RETURN(TRUE);				/* purecov: tested */
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5030 5031
  }

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Marc Alff committed
5032
  if ((db != NULL) && (db != any_db))
5033
  {
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5034 5035 5036
    const ACL_internal_schema_access *access;
    access= get_cached_schema_access(grant_internal_info, db);
    if (access)
5037
    {
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5038
      switch (access->check(want_access, save_priv))
5039
      {
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5040 5041 5042 5043 5044 5045 5046 5047 5048 5049 5050 5051 5052 5053 5054 5055 5056 5057 5058 5059
      case ACL_INTERNAL_ACCESS_GRANTED:
        /*
          All the privileges requested have been granted internally.
          [out] *save_privileges= Internal privileges.
        */
        DBUG_RETURN(FALSE);
      case ACL_INTERNAL_ACCESS_DENIED:
        if (! no_errors)
        {
          my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
                   sctx->priv_user, sctx->priv_host, db);
        }
        DBUG_RETURN(TRUE);
      case ACL_INTERNAL_ACCESS_CHECK_GRANT:
        /*
          Only some of the privilege requested have been granted internally,
          proceed with the remaining bits of the request (want_access).
        */
        want_access&= ~(*save_priv);
        break;
5060
      }
5061 5062 5063
    }
  }

5064
  if ((sctx->master_access & want_access) == want_access)
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5065
  {
5066
    /*
5067 5068
      1. If we don't have a global SELECT privilege, we have to get the
      database specific access rights to be able to handle queries of type
5069
      UPDATE t1 SET a=1 WHERE b > 0
5070
      2. Change db access if it isn't current db which is being addressed
5071
    */
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5072 5073 5074 5075 5076 5077 5078 5079 5080 5081 5082 5083 5084 5085 5086 5087 5088 5089 5090
    if (!(sctx->master_access & SELECT_ACL))
    {
      if (db && (!thd->db || db_is_pattern || strcmp(db, thd->db)))
        db_access= acl_get(sctx->host, sctx->ip, sctx->priv_user, db,
                           db_is_pattern);
      else
      {
        /* get access for current db */
        db_access= sctx->db_access;
      }
      /*
        The effective privileges are the union of the global privileges
        and the intersection of db- and host-privileges,
        plus the internal privileges.
      */
      *save_priv|= sctx->master_access | db_access;
    }
    else
      *save_priv|= sctx->master_access;
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5091
    DBUG_RETURN(FALSE);
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5092
  }
5093
  if (((want_access & ~sctx->master_access) & ~DB_ACLS) ||
5094
      (! db && dont_check_global_grants))
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unknown committed
5095
  {						// We can never grant this
5096
    DBUG_PRINT("error",("No possible access"));
5097
    if (!no_errors)
5098
      my_error(ER_ACCESS_DENIED_ERROR, MYF(0),
5099 5100
               sctx->priv_user,
               sctx->priv_host,
5101 5102 5103
               (thd->password ?
                ER(ER_YES) :
                ER(ER_NO)));                    /* purecov: tested */
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5104
    DBUG_RETURN(TRUE);				/* purecov: tested */
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5105 5106 5107
  }

  if (db == any_db)
5108 5109 5110 5111 5112 5113 5114
  {
    /*
      Access granted; Allow select on *any* db.
      [out] *save_privileges= 0
    */
    DBUG_RETURN(FALSE);
  }
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5115

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5116
  if (db && (!thd->db || db_is_pattern || strcmp(db,thd->db)))
5117 5118
    db_access= acl_get(sctx->host, sctx->ip, sctx->priv_user, db,
                       db_is_pattern);
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5119
  else
5120
    db_access= sctx->db_access;
5121 5122
  DBUG_PRINT("info",("db_access: %lu  want_access: %lu",
                     db_access, want_access));
5123

5124 5125
  /*
    Save the union of User-table and the intersection between Db-table and
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5126
    Host-table privileges, with the already saved internal privileges.
5127 5128
  */
  db_access= (db_access | sctx->master_access);
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5129
  *save_priv|= db_access;
5130 5131 5132 5133 5134 5135 5136 5137 5138 5139 5140 5141 5142 5143 5144

  /*
    We need to investigate column- and table access if all requested privileges
    belongs to the bit set of .
  */
  bool need_table_or_column_check=
    (want_access & (TABLE_ACLS | PROC_ACLS | db_access)) == want_access;

  /*
    Grant access if the requested access is in the intersection of
    host- and db-privileges (as retrieved from the acl cache),
    also grant access if all the requested privileges are in the union of
    TABLES_ACLS and PROC_ACLS; see check_grant.
  */
  if ( (db_access & want_access) == want_access ||
5145
      (!dont_check_global_grants &&
5146 5147 5148 5149
       need_table_or_column_check))
  {
    /*
       Ok; but need to check table- and column privileges.
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5150
       [out] *save_privileges is (User-priv | (Db-priv & Host-priv) | Internal-priv)
5151 5152 5153
    */
    DBUG_RETURN(FALSE);
  }
5154

5155 5156
  /*
    Access is denied;
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5157
    [out] *save_privileges is (User-priv | (Db-priv & Host-priv) | Internal-priv)
5158
  */
5159
  DBUG_PRINT("error",("Access denied"));
5160
  if (!no_errors)
5161
    my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
5162
             sctx->priv_user, sctx->priv_host,
5163 5164
             (db ? db : (thd->db ?
                         thd->db :
5165 5166 5167
                         "unknown")));
  DBUG_RETURN(TRUE);

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5168 5169 5170
}


5171 5172
static bool check_show_access(THD *thd, TABLE_LIST *table)
{
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5173 5174 5175 5176 5177 5178 5179 5180 5181 5182 5183 5184
  /*
    This is a SHOW command using an INFORMATION_SCHEMA table.
    check_access() has not been called for 'table',
    and SELECT is currently always granted on the I_S, so we automatically
    grant SELECT on table here, to bypass a call to check_access().
    Note that not calling check_access(table) is an optimization,
    which needs to be revisited if the INFORMATION_SCHEMA does
    not always automatically grant SELECT but use the grant tables.
    See Bug#38837 need a way to disable information_schema for security
  */
  table->grant.privilege= SELECT_ACL;

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5185
  switch (get_schema_table_idx(table->schema_table)) {
5186 5187
  case SCH_SCHEMATA:
    return (specialflag & SPECIAL_SKIP_SHOW_DB) &&
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5188
      check_global_access(thd, SHOW_DB_ACL);
5189 5190 5191 5192 5193

  case SCH_TABLE_NAMES:
  case SCH_TABLES:
  case SCH_VIEWS:
  case SCH_TRIGGERS:
unknown's avatar
unknown committed
5194 5195 5196
  case SCH_EVENTS:
  {
    const char *dst_db_name= table->schema_select_lex->db;
5197

unknown's avatar
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5198
    DBUG_ASSERT(dst_db_name);
5199

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5200
    if (check_access(thd, SELECT_ACL, dst_db_name,
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Marc Alff committed
5201
                     &thd->col_access, NULL, FALSE, FALSE))
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5202
      return TRUE;
5203

unknown's avatar
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5204 5205 5206 5207 5208 5209 5210
    if (!thd->col_access && check_grant_db(thd, dst_db_name))
    {
      my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
               thd->security_ctx->priv_user,
               thd->security_ctx->priv_host,
               dst_db_name);
      return TRUE;
5211 5212
    }

unknown's avatar
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5213 5214 5215
    return FALSE;
  }

5216 5217
  case SCH_COLUMNS:
  case SCH_STATISTICS:
unknown's avatar
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5218 5219 5220
  {
    TABLE_LIST *dst_table;
    dst_table= (TABLE_LIST *) table->schema_select_lex->table_list.first;
5221

unknown's avatar
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5222
    DBUG_ASSERT(dst_table);
5223

5224
    if (check_access(thd, SELECT_ACL, dst_table->db,
Marc Alff's avatar
Marc Alff committed
5225 5226 5227
                     &dst_table->grant.privilege,
                     &dst_table->grant.m_internal,
                     FALSE, FALSE))
5228 5229 5230 5231 5232 5233 5234 5235
          return TRUE; /* Access denied */

    /*
      Check_grant will grant access if there is any column privileges on
      all of the tables thanks to the fourth parameter (bool show_table).
    */
    if (check_grant(thd, SELECT_ACL, dst_table, TRUE, UINT_MAX, FALSE))
      return TRUE; /* Access denied */
5236

5237 5238
    /* Access granted */
    return FALSE;
unknown's avatar
unknown committed
5239 5240
  }
  default:
5241 5242 5243 5244 5245 5246 5247
    break;
  }

  return FALSE;
}


5248

5249 5250 5251 5252 5253 5254 5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266 5267 5268 5269 5270 5271 5272 5273 5274 5275 5276
/**
  @brief Check if the requested privileges exists in either User-, Host- or
    Db-tables.
  @param thd          Thread context
  @param want_access  Privileges requested
  @param tables       List of tables to be compared against
  @param no_errors    Don't report error to the client (using my_error() call).
  @param any_combination_of_privileges_will_do TRUE if any privileges on any
    column combination is enough.
  @param number       Only the first 'number' tables in the linked list are
                      relevant.

  The suppled table list contains cached privileges. This functions calls the
  help functions check_access and check_grant to verify the first three steps
  in the privileges check queue:
  1. Global privileges
  2. OR (db privileges AND host privileges)
  3. OR table privileges
  4. OR column privileges (not checked by this function!)
  5. OR routine privileges (not checked by this function!)

  @see check_access
  @see check_grant

  @note This functions assumes that table list used and
  thd->lex->query_tables_own_last value correspond to each other
  (the latter should be either 0 or point to next_global member
  of one of elements of this table list).
5277

5278 5279 5280 5281
  @return
    @retval FALSE OK
    @retval TRUE  Access denied; But column or routine privileges might need to
      be checked also.
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5282 5283
*/

5284
bool
5285 5286 5287
check_table_access(THD *thd, ulong requirements,TABLE_LIST *tables,
		   bool any_combination_of_privileges_will_do,
                   uint number, bool no_errors)
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5288
{
5289 5290
  TABLE_LIST *org_tables= tables;
  TABLE_LIST *first_not_own_table= thd->lex->first_not_own_table();
5291
  uint i= 0;
5292
  Security_context *sctx= thd->security_ctx, *backup_ctx= thd->security_ctx;
5293
  /*
unknown's avatar
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5294 5295 5296
    The check that first_not_own_table is not reached is for the case when
    the given table list refers to the list for prelocking (contains tables
    of other queries). For simple queries first_not_own_table is 0.
5297
  */
5298
  for (; i < number && tables != first_not_own_table && tables;
5299
       tables= tables->next_global, i++)
unknown's avatar
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5300
  {
5301
    ulong want_access= requirements;
5302 5303 5304 5305 5306
    if (tables->security_ctx)
      sctx= tables->security_ctx;
    else
      sctx= backup_ctx;

5307 5308 5309 5310 5311
    /*
       Register access for view underlying table.
       Remove SHOW_VIEW_ACL, because it will be checked during making view
     */
    tables->grant.orig_want_privilege= (want_access & ~SHOW_VIEW_ACL);
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5312 5313 5314 5315 5316 5317 5318 5319

    if (tables->schema_table_reformed)
    {
      if (check_show_access(thd, tables))
        goto deny;
      continue;
    }

5320 5321
    DBUG_PRINT("info", ("derived: %d  view: %d", tables->derived != 0,
                        tables->view != 0));
5322
    if (tables->is_anonymous_derived_table() ||
5323 5324
        (tables->table && tables->table->s &&
         (int)tables->table->s->tmp_table))
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5325
      continue;
5326
    thd->security_ctx= sctx;
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5327 5328 5329 5330 5331

    if (check_access(thd, want_access, tables->get_db_name(),
                     &tables->grant.privilege,
                     &tables->grant.m_internal,
                     0, no_errors))
5332
      goto deny;
unknown's avatar
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5333
  }
5334
  thd->security_ctx= backup_ctx;
5335 5336 5337
  return check_grant(thd,requirements,org_tables,
                     any_combination_of_privileges_will_do,
                     number, no_errors);
5338 5339 5340
deny:
  thd->security_ctx= backup_ctx;
  return TRUE;
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5341 5342
}

5343

5344
bool
5345 5346
check_routine_access(THD *thd, ulong want_access,char *db, char *name,
		     bool is_proc, bool no_errors)
5347 5348 5349 5350 5351
{
  TABLE_LIST tables[1];
  
  bzero((char *)tables, sizeof(TABLE_LIST));
  tables->db= db;
5352
  tables->table_name= tables->alias= name;
5353
  
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5354 5355 5356 5357 5358
  /*
    The following test is just a shortcut for check_access() (to avoid
    calculating db_access) under the assumption that it's common to
    give persons global right to execute all stored SP (but not
    necessary to create them).
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5359 5360 5361 5362 5363 5364
    Note that this effectively bypasses the ACL_internal_schema_access checks
    that are implemented for the INFORMATION_SCHEMA and PERFORMANCE_SCHEMA,
    which are located in check_access().
    Since the I_S and P_S do not contain routines, this bypass is ok,
    as long as this code path is not abused to create routines.
    The assert enforce that.
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5365
  */
Marc Alff's avatar
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5366
  DBUG_ASSERT((want_access & CREATE_PROC_ACL) == 0);
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5367
  if ((thd->security_ctx->master_access & want_access) == want_access)
5368
    tables->grant.privilege= want_access;
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Marc Alff committed
5369 5370 5371 5372
  else if (check_access(thd, want_access, db,
                        &tables->grant.privilege,
                        &tables->grant.m_internal,
                        0, no_errors))
5373 5374
    return TRUE;
  
5375
  return check_grant_routine(thd, want_access, tables, is_proc, no_errors);
5376 5377
}

5378

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5379 5380
/**
  Check if the routine has any of the routine privileges.
5381

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5382 5383 5384
  @param thd	       Thread handler
  @param db           Database name
  @param name         Routine name
5385

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5386
  @retval
5387
    0            ok
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5388
  @retval
5389 5390 5391
    1            error
*/

5392 5393
bool check_some_routine_access(THD *thd, const char *db, const char *name,
                               bool is_proc)
5394 5395
{
  ulong save_priv;
5396
  /*
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5397 5398 5399 5400 5401 5402 5403
    The following test is just a shortcut for check_access() (to avoid
    calculating db_access)
    Note that this effectively bypasses the ACL_internal_schema_access checks
    that are implemented for the INFORMATION_SCHEMA and PERFORMANCE_SCHEMA,
    which are located in check_access().
    Since the I_S and P_S do not contain routines, this bypass is ok,
    as it only opens SHOW_PROC_ACLS.
5404
  */
Marc Alff's avatar
Marc Alff committed
5405 5406 5407
  if (thd->security_ctx->master_access & SHOW_PROC_ACLS)
    return FALSE;
  if (!check_access(thd, SHOW_PROC_ACLS, db, &save_priv, NULL, 0, 1) ||
5408 5409
      (save_priv & SHOW_PROC_ACLS))
    return FALSE;
5410
  return check_routine_level_acl(thd, db, name, is_proc);
5411 5412 5413
}


5414 5415 5416
/*
  Check if the given table has any of the asked privileges

unknown's avatar
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5417 5418
  @param thd		 Thread handler
  @param want_access	 Bitmap of possible privileges to check for
5419

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5420
  @retval
5421
    0  ok
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5422
  @retval
5423 5424 5425 5426 5427 5428 5429 5430 5431 5432 5433 5434 5435 5436
    1  error
*/

bool check_some_access(THD *thd, ulong want_access, TABLE_LIST *table)
{
  ulong access;
  DBUG_ENTER("check_some_access");

  /* This loop will work as long as we have less than 32 privileges */
  for (access= 1; access < want_access ; access<<= 1)
  {
    if (access & want_access)
    {
      if (!check_access(thd, access, table->db,
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Marc Alff committed
5437 5438 5439
                        &table->grant.privilege,
                        &table->grant.m_internal,
                        0, 1) &&
5440
           !check_grant(thd, access, table, FALSE, 1, TRUE))
5441 5442 5443 5444 5445 5446 5447
        DBUG_RETURN(0);
    }
  }
  DBUG_PRINT("exit",("no matching access rights"));
  DBUG_RETURN(1);
}

unknown's avatar
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5448
#endif /*NO_EMBEDDED_ACCESS_CHECKS*/
5449

5450 5451 5452 5453 5454 5455 5456 5457 5458 5459 5460 5461 5462 5463 5464 5465 5466 5467 5468 5469 5470 5471 5472 5473 5474 5475 5476 5477 5478 5479 5480 5481 5482

/**
  check for global access and give descriptive error message if it fails.

  @param thd			Thread handler
  @param want_access		Use should have any of these global rights

  @warning
    One gets access right if one has ANY of the rights in want_access.
    This is useful as one in most cases only need one global right,
    but in some case we want to check if the user has SUPER or
    REPL_CLIENT_ACL rights.

  @retval
    0	ok
  @retval
    1	Access denied.  In this case an error is sent to the client
*/

bool check_global_access(THD *thd, ulong want_access)
{
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  char command[128];
  if ((thd->security_ctx->master_access & want_access))
    return 0;
  get_privilege_desc(command, sizeof(command), want_access);
  my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), command);
  return 1;
#else
  return 0;
#endif
}

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5483 5484 5485 5486
/****************************************************************************
	Check stack size; Send error if there isn't enough stack to continue
****************************************************************************/

5487

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5488 5489 5490 5491 5492 5493
#if STACK_DIRECTION < 0
#define used_stack(A,B) (long) (A - B)
#else
#define used_stack(A,B) (long) (B - A)
#endif

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5494 5495 5496 5497
#ifndef DBUG_OFF
long max_stack_used;
#endif

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5498 5499
/**
  @note
5500 5501 5502 5503
  Note: The 'buf' parameter is necessary, even if it is unused here.
  - fix_fields functions has a "dummy" buffer large enough for the
    corresponding exec. (Thus we only have to check in fix_fields.)
  - Passing to check_stack_overrun() prevents the compiler from removing it.
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5504
*/
5505
bool check_stack_overrun(THD *thd, long margin,
5506
			 uchar *buf __attribute__((unused)))
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5507 5508
{
  long stack_used;
5509
  DBUG_ASSERT(thd == current_thd);
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5510
  if ((stack_used=used_stack(thd->thread_stack,(char*) &stack_used)) >=
5511
      (long) (my_thread_stack_size - margin))
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5512
  {
5513 5514 5515 5516
    char ebuff[MYSQL_ERRMSG_SIZE];
    my_snprintf(ebuff, sizeof(ebuff), ER(ER_STACK_OVERRUN_NEED_MORE),
                stack_used, my_thread_stack_size, margin);
    my_message(ER_STACK_OVERRUN_NEED_MORE, ebuff, MYF(ME_FATALERROR));
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5517 5518
    return 1;
  }
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5519 5520 5521
#ifndef DBUG_OFF
  max_stack_used= max(max_stack_used, stack_used);
#endif
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5522 5523
  return 0;
}
5524

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5525 5526 5527 5528

#define MY_YACC_INIT 1000			// Start with big alloc
#define MY_YACC_MAX  32000			// Because of 'short'

5529
bool my_yyoverflow(short **yyss, YYSTYPE **yyvs, ulong *yystacksize)
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5530
{
5531
  Yacc_state *state= & current_thd->m_parser_state->m_yacc;
5532
  ulong old_info=0;
5533
  DBUG_ASSERT(state);
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5534 5535
  if ((uint) *yystacksize >= MY_YACC_MAX)
    return 1;
5536
  if (!state->yacc_yyvs)
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5537 5538
    old_info= *yystacksize;
  *yystacksize= set_zone((*yystacksize)*2,MY_YACC_INIT,MY_YACC_MAX);
5539
  if (!(state->yacc_yyvs= (uchar*)
5540
        my_realloc(state->yacc_yyvs,
5541 5542 5543
                   *yystacksize*sizeof(**yyvs),
                   MYF(MY_ALLOW_ZERO_PTR | MY_FREE_ON_ERROR))) ||
      !(state->yacc_yyss= (uchar*)
5544
        my_realloc(state->yacc_yyss,
5545 5546
                   *yystacksize*sizeof(**yyss),
                   MYF(MY_ALLOW_ZERO_PTR | MY_FREE_ON_ERROR))))
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5547 5548
    return 1;
  if (old_info)
5549 5550 5551 5552 5553 5554 5555 5556
  {
    /*
      Only copy the old stack on the first call to my_yyoverflow(),
      when replacing a static stack (YYINITDEPTH) by a dynamic stack.
      For subsequent calls, my_realloc already did preserve the old stack.
    */
    memcpy(state->yacc_yyss, *yyss, old_info*sizeof(**yyss));
    memcpy(state->yacc_yyvs, *yyvs, old_info*sizeof(**yyvs));
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5557
  }
5558 5559
  *yyss= (short*) state->yacc_yyss;
  *yyvs= (YYSTYPE*) state->yacc_yyvs;
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5560 5561 5562 5563
  return 0;
}


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5564
/**
5565 5566
  Reset the part of THD responsible for the state of command
  processing.
5567

5568 5569 5570
  This needs to be called before execution of every statement
  (prepared or conventional).  It is not called by substatements of
  routines.
5571

5572 5573
  @todo Remove mysql_reset_thd_for_next_command and only use the
  member function.
5574

5575 5576
  @todo Call it after we use THD for queries, not before.
*/
5577 5578
void mysql_reset_thd_for_next_command(THD *thd)
{
5579 5580 5581 5582 5583 5584
  thd->reset_for_next_command();
}

void THD::reset_for_next_command()
{
  THD *thd= this;
5585
  DBUG_ENTER("mysql_reset_thd_for_next_command");
5586
  DBUG_ASSERT(!thd->spcont); /* not for substatements of routines */
5587
  DBUG_ASSERT(! thd->in_sub_stmt);
5588
  thd->free_list= 0;
5589
  thd->select_number= 1;
5590 5591 5592 5593
  /*
    Those two lines below are theoretically unneeded as
    THD::cleanup_after_query() should take care of this already.
  */
5594
  thd->auto_inc_intervals_in_cur_stmt_for_binlog.empty();
5595 5596 5597
  thd->stmt_depends_on_first_successful_insert_id_in_prev_stmt= 0;

  thd->query_start_used= 0;
5598
  thd->is_fatal_error= thd->time_zone_used= 0;
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  /*
    Clear the status flag that are expected to be cleared at the
    beginning of each SQL statement.
  */
  thd->server_status&= ~SERVER_STATUS_CLEAR_SET;
5604 5605 5606 5607 5608
  /*
    If in autocommit mode and not in a transaction, reset
    OPTION_STATUS_NO_TRANS_UPDATE | OPTION_KEEP_LOG to not get warnings
    in ha_rollback_trans() about some tables couldn't be rolled back.
  */
5609
  if (!thd->in_multi_stmt_transaction_mode())
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5610
  {
5611
    thd->variables.option_bits&= ~OPTION_KEEP_LOG;
5612
    thd->transaction.all.modified_non_trans_table= FALSE;
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5613
  }
5614
  DBUG_ASSERT(thd->security_ctx== &thd->main_security_ctx);
5615
  thd->thread_specific_used= thd->thread_temporary_used= FALSE;
5616 5617

  if (opt_bin_log)
5618
  {
5619 5620
    reset_dynamic(&thd->user_var_events);
    thd->user_var_events_alloc= thd->mem_root;
5621
  }
5622
  thd->clear_error();
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Marc Alff committed
5623 5624
  thd->stmt_da->reset_diagnostics_area();
  thd->warning_info->reset_for_next_command();
5625 5626 5627
  thd->rand_used= 0;
  thd->sent_row_count= thd->examined_row_count= 0;

5628
  thd->reset_current_stmt_binlog_format_row();
5629
  thd->binlog_unsafe_warning_flags= 0;
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5630

5631
  DBUG_PRINT("debug",
5632
             ("is_current_stmt_binlog_format_row(): %d",
5633
              thd->is_current_stmt_binlog_format_row()));
5634

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5635 5636 5637
  DBUG_VOID_RETURN;
}

5638

5639 5640 5641 5642 5643 5644 5645 5646
/**
  Resets the lex->current_select object.
  @note It is assumed that lex->current_select != NULL

  This function is a wrapper around select_lex->init_select() with an added
  check for the special situation when using INTO OUTFILE and LOAD DATA.
*/

5647 5648 5649
void
mysql_init_select(LEX *lex)
{
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5650
  SELECT_LEX *select_lex= lex->current_select;
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5651
  select_lex->init_select();
5652
  lex->wild= 0;
5653 5654
  if (select_lex == &lex->select_lex)
  {
5655
    DBUG_ASSERT(lex->result == 0);
5656 5657
    lex->exchange= 0;
  }
5658 5659
}

5660

5661 5662 5663 5664 5665 5666 5667 5668 5669 5670 5671 5672
/**
  Used to allocate a new SELECT_LEX object on the current thd mem_root and
  link it into the relevant lists.

  This function is always followed by mysql_init_select.

  @see mysql_init_select

  @retval TRUE An error occurred
  @retval FALSE The new SELECT_LEX was successfully allocated.
*/

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5673
bool
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5674
mysql_new_select(LEX *lex, bool move_down)
5675
{
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5676
  SELECT_LEX *select_lex;
5677
  THD *thd= lex->thd;
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5678 5679
  DBUG_ENTER("mysql_new_select");

5680
  if (!(select_lex= new (thd->mem_root) SELECT_LEX()))
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5681
    DBUG_RETURN(1);
5682
  select_lex->select_number= ++thd->select_number;
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5683
  select_lex->parent_lex= lex; /* Used in init_query. */
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5684 5685
  select_lex->init_query();
  select_lex->init_select();
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5686
  lex->nest_level++;
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  if (lex->nest_level > (int) MAX_SELECT_NESTING)
  {
    my_error(ER_TOO_HIGH_LEVEL_OF_NESTING_FOR_SELECT,MYF(0),MAX_SELECT_NESTING);
    DBUG_RETURN(1);
  }
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5692
  select_lex->nest_level= lex->nest_level;
5693 5694 5695
  /*
    Don't evaluate this subquery during statement prepare even if
    it's a constant one. The flag is switched off in the end of
5696
    mysqld_stmt_prepare.
5697
  */
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5698
  if (thd->stmt_arena->is_stmt_prepare())
5699
    select_lex->uncacheable|= UNCACHEABLE_PREPARE;
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5700 5701
  if (move_down)
  {
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5702
    SELECT_LEX_UNIT *unit;
5703
    lex->subqueries= TRUE;
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5704
    /* first select_lex of subselect or derived table */
5705
    if (!(unit= new (thd->mem_root) SELECT_LEX_UNIT()))
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5706
      DBUG_RETURN(1);
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5707

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5708 5709
    unit->init_query();
    unit->init_select();
5710
    unit->thd= thd;
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5711
    unit->include_down(lex->current_select);
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5712 5713
    unit->link_next= 0;
    unit->link_prev= 0;
5714
    unit->return_to= lex->current_select;
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5715
    select_lex->include_down(unit);
5716 5717 5718 5719 5720
    /*
      By default we assume that it is usual subselect and we have outer name
      resolution context, if no we will assign it to 0 later
    */
    select_lex->context.outer_context= &select_lex->outer_select()->context;
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5721 5722
  }
  else
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5723
  {
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VIEW  
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5724 5725
    if (lex->current_select->order_list.first && !lex->current_select->braces)
    {
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5726
      my_error(ER_WRONG_USAGE, MYF(0), "UNION", "ORDER BY");
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5727
      DBUG_RETURN(1);
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VIEW  
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5728
    }
5729
    select_lex->include_neighbour(lex->current_select);
5730 5731 5732 5733 5734
    SELECT_LEX_UNIT *unit= select_lex->master_unit();                              
    if (!unit->fake_select_lex && unit->add_fake_select_lex(lex->thd))
      DBUG_RETURN(1);
    select_lex->context.outer_context= 
                unit->first_select()->context.outer_context;
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5735
  }
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5736

5737
  select_lex->master_unit()->global_parameters= select_lex;
5738
  select_lex->include_global((st_select_lex_node**)&lex->all_selects_list);
5739
  lex->current_select= select_lex;
5740 5741 5742 5743 5744
  /*
    in subquery is SELECT query and we allow resolution of names in SELECT
    list
  */
  select_lex->context.resolve_in_select_list= TRUE;
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5745
  DBUG_RETURN(0);
5746
}
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5747

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5748
/**
5749 5750
  Create a select to return the same output as 'SELECT @@var_name'.

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5751
  Used for SHOW COUNT(*) [ WARNINGS | ERROR].
5752

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5753
  This will crash with a core dump if the variable doesn't exists.
5754

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5755
  @param var_name		Variable name
5756 5757 5758 5759
*/

void create_select_for_variable(const char *var_name)
{
5760
  THD *thd;
5761
  LEX *lex;
5762
  LEX_STRING tmp, null_lex_string;
5763 5764
  Item *var;
  char buff[MAX_SYS_VAR_LENGTH*2+4+8], *end;
5765
  DBUG_ENTER("create_select_for_variable");
5766 5767

  thd= current_thd;
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5768
  lex= thd->lex;
5769 5770 5771 5772
  mysql_init_select(lex);
  lex->sql_command= SQLCOM_SELECT;
  tmp.str= (char*) var_name;
  tmp.length=strlen(var_name);
5773
  bzero((char*) &null_lex_string.str, sizeof(null_lex_string));
5774 5775 5776 5777
  /*
    We set the name of Item to @@session.var_name because that then is used
    as the column name in the output.
  */
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5778 5779 5780 5781 5782 5783
  if ((var= get_system_var(thd, OPT_SESSION, tmp, null_lex_string)))
  {
    end= strxmov(buff, "@@session.", var_name, NullS);
    var->set_name(buff, end-buff, system_charset_info);
    add_item_to_list(thd, var);
  }
5784 5785 5786
  DBUG_VOID_RETURN;
}

5787

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5788 5789
void mysql_init_multi_delete(LEX *lex)
{
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5790
  lex->sql_command=  SQLCOM_DELETE_MULTI;
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5791
  mysql_init_select(lex);
5792 5793
  lex->select_lex.select_limit= 0;
  lex->unit.select_limit_cnt= HA_POS_ERROR;
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5794
  lex->select_lex.table_list.save_and_clear(&lex->auxiliary_table_list);
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VIEW  
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5795 5796
  lex->query_tables= 0;
  lex->query_tables_last= &lex->query_tables;
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5797
}
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5798

5799

5800 5801 5802 5803
/*
  When you modify mysql_parse(), you may need to mofify
  mysql_test_parse_for_slave() in this same file.
*/
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5804

5805 5806
/**
  Parse a query.
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5807 5808 5809 5810 5811 5812

  @param       thd     Current thread
  @param       inBuf   Begining of the query text
  @param       length  Length of the query text
  @param[out]  found_semicolon For multi queries, position of the character of
                               the next query in the query text.
5813 5814 5815
*/

void mysql_parse(THD *thd, const char *inBuf, uint length,
5816
                 Parser_state *parser_state)
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5817
{
5818
  int error;
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5819
  DBUG_ENTER("mysql_parse");
5820 5821 5822

  DBUG_EXECUTE_IF("parser_debug", turn_parser_debug_on(););

5823 5824 5825 5826 5827 5828 5829 5830 5831 5832 5833 5834 5835 5836 5837 5838 5839 5840
  /*
    Warning.
    The purpose of query_cache_send_result_to_client() is to lookup the
    query in the query cache first, to avoid parsing and executing it.
    So, the natural implementation would be to:
    - first, call query_cache_send_result_to_client,
    - second, if caching failed, initialise the lexical and syntactic parser.
    The problem is that the query cache depends on a clean initialization
    of (among others) lex->safe_to_cache_query and thd->server_status,
    which are reset respectively in
    - lex_start()
    - mysql_reset_thd_for_next_command()
    So, initializing the lexical analyser *before* using the query cache
    is required for the cache to work properly.
    FIXME: cleanup the dependencies in the code to simplify this.
  */
  lex_start(thd);
  mysql_reset_thd_for_next_command(thd);
5841

5842
  if (query_cache_send_result_to_client(thd, (char*) inBuf, length) <= 0)
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5843
  {
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5844
    LEX *lex= thd->lex;
5845

5846
    bool err= parse_sql(thd, parser_state, NULL);
5847

5848
    if (!err)
unknown's avatar
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5849
    {
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5850
#ifndef NO_EMBEDDED_ACCESS_CHECKS
5851
      if (mqh_used && thd->user_connect &&
5852
	  check_mqh(thd, lex->sql_command))
5853 5854 5855 5856
      {
	thd->net.error = 0;
      }
      else
unknown's avatar
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5857
#endif
5858
      {
5859
	if (! thd->is_error())
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5860
	{
5861
          const char *found_semicolon= parser_state->m_lip.found_semicolon;
5862 5863 5864 5865 5866 5867 5868 5869 5870 5871
          /*
            Binlog logs a string starting from thd->query and having length
            thd->query_length; so we set thd->query_length correctly (to not
            log several statements in one event, when we executed only first).
            We set it to not see the ';' (otherwise it would get into binlog
            and Query_log_event::print() would give ';;' output).
            This also helps display only the current query in SHOW
            PROCESSLIST.
            Note that we don't need LOCK_thread_count to modify query_length.
          */
5872
          if (found_semicolon && (ulong) (found_semicolon - thd->query()))
5873
            thd->set_query_inner(thd->query(),
5874
                                 (uint32) (found_semicolon -
5875
                                           thd->query() - 1));
5876
          /* Actually execute the query */
5877
          if (found_semicolon)
5878 5879 5880 5881
          {
            lex->safe_to_cache_query= 0;
            thd->server_status|= SERVER_MORE_RESULTS_EXISTS;
          }
5882
          lex->set_trg_event_type_for_tables();
5883
          MYSQL_QUERY_EXEC_START(thd->query(),
5884 5885 5886 5887 5888 5889 5890 5891
                                 thd->thread_id,
                                 (char *) (thd->db ? thd->db : ""),
                                 thd->security_ctx->priv_user,
                                 (char *) thd->security_ctx->host_or_ip,
                                 0);

          error= mysql_execute_command(thd);
          MYSQL_QUERY_EXEC_DONE(error);
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5892
	}
5893
      }
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5894 5895
    }
    else
5896
    {
5897
      DBUG_ASSERT(thd->is_error());
5898
      DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
5899
			 thd->is_fatal_error));
5900

5901
      query_cache_abort(&thd->query_cache_tls);
5902
    }
5903 5904 5905 5906 5907 5908
    if (thd->lex->sphead)
    {
      delete thd->lex->sphead;
      thd->lex->sphead= 0;
    }
    lex->unit.cleanup();
5909
    thd_proc_info(thd, "freeing items");
5910
    thd->end_statement();
5911
    thd->cleanup_after_query();
5912
    DBUG_ASSERT(thd->change_list.is_empty());
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5913
  }
5914

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5915 5916 5917 5918
  DBUG_VOID_RETURN;
}


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5919
#ifdef HAVE_REPLICATION
5920 5921 5922 5923
/*
  Usable by the replication SQL thread only: just parse a query to know if it
  can be ignored because of replicate-*-table rules.

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5924
  @retval
5925
    0	cannot be ignored
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5926
  @retval
5927 5928 5929 5930 5931
    1	can be ignored
*/

bool mysql_test_parse_for_slave(THD *thd, char *inBuf, uint length)
{
unknown's avatar
unknown committed
5932
  LEX *lex= thd->lex;
5933
  bool error= 0;
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5934
  DBUG_ENTER("mysql_test_parse_for_slave");
5935

5936
  Parser_state parser_state(thd, inBuf, length);
5937 5938 5939
  lex_start(thd);
  mysql_reset_thd_for_next_command(thd);

5940
  if (!parse_sql(thd, & parser_state, NULL) &&
5941
      all_tables_not_ok(thd,(TABLE_LIST*) lex->select_lex.table_list.first))
unknown's avatar
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5942
    error= 1;                  /* Ignore question */
5943
  thd->end_statement();
5944
  thd->cleanup_after_query();
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5945
  DBUG_RETURN(error);
5946
}
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5947
#endif
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5948

5949

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5950

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5951 5952 5953 5954 5955 5956
/**
  Store field definition for create.

  @return
    Return 0 if ok
*/
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5957

5958
bool add_field_to_list(THD *thd, LEX_STRING *field_name, enum_field_types type,
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5959
		       char *length, char *decimals,
5960
		       uint type_modifier,
5961 5962
		       Item *default_value, Item *on_update_value,
                       LEX_STRING *comment,
5963 5964
		       char *change,
                       List<String> *interval_list, CHARSET_INFO *cs,
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5965
		       uint uint_geom_type)
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5966
{
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5967
  register Create_field *new_field;
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5968
  LEX  *lex= thd->lex;
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5969 5970
  DBUG_ENTER("add_field_to_list");

5971 5972
  if (check_string_char_length(field_name, "", NAME_CHAR_LEN,
                               system_charset_info, 1))
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unknown committed
5973
  {
5974
    my_error(ER_TOO_LONG_IDENT, MYF(0), field_name->str); /* purecov: inspected */
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5975 5976 5977 5978
    DBUG_RETURN(1);				/* purecov: inspected */
  }
  if (type_modifier & PRI_KEY_FLAG)
  {
5979
    Key *key;
5980 5981
    lex->col_list.push_back(new Key_part_spec(*field_name, 0));
    key= new Key(Key::PRIMARY, null_lex_str,
5982 5983 5984
                      &default_key_create_info,
                      0, lex->col_list);
    lex->alter_info.key_list.push_back(key);
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    lex->col_list.empty();
  }
  if (type_modifier & (UNIQUE_FLAG | UNIQUE_KEY_FLAG))
  {
5989
    Key *key;
5990 5991
    lex->col_list.push_back(new Key_part_spec(*field_name, 0));
    key= new Key(Key::UNIQUE, null_lex_str,
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                 &default_key_create_info, 0,
                 lex->col_list);
    lex->alter_info.key_list.push_back(key);
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    lex->col_list.empty();
  }

5998
  if (default_value)
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  {
6000
    /* 
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      Default value should be literal => basic constants =>
      no need fix_fields()
6003 6004 6005
      
      We allow only one function as part of default value - 
      NOW() as default for TIMESTAMP type.
6006
    */
6007 6008
    if (default_value->type() == Item::FUNC_ITEM && 
        !(((Item_func*)default_value)->functype() == Item_func::NOW_FUNC &&
6009
         type == MYSQL_TYPE_TIMESTAMP))
6010
    {
6011
      my_error(ER_INVALID_DEFAULT, MYF(0), field_name->str);
6012 6013 6014
      DBUG_RETURN(1);
    }
    else if (default_value->type() == Item::NULL_ITEM)
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    {
6016
      default_value= 0;
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      if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) ==
	  NOT_NULL_FLAG)
      {
6020
	my_error(ER_INVALID_DEFAULT, MYF(0), field_name->str);
6021 6022 6023 6024 6025
	DBUG_RETURN(1);
      }
    }
    else if (type_modifier & AUTO_INCREMENT_FLAG)
    {
6026
      my_error(ER_INVALID_DEFAULT, MYF(0), field_name->str);
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      DBUG_RETURN(1);
    }
  }
6030

6031
  if (on_update_value && type != MYSQL_TYPE_TIMESTAMP)
6032
  {
6033
    my_error(ER_INVALID_ON_UPDATE, MYF(0), field_name->str);
6034 6035
    DBUG_RETURN(1);
  }
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6036

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  if (!(new_field= new Create_field()) ||
6038
      new_field->init(thd, field_name->str, type, length, decimals, type_modifier,
6039 6040
                      default_value, on_update_value, comment, change,
                      interval_list, cs, uint_geom_type))
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    DBUG_RETURN(1);
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6043
  lex->alter_info.create_list.push_back(new_field);
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  lex->last_field=new_field;
  DBUG_RETURN(0);
}

6048

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/** Store position for column in ALTER TABLE .. ADD column. */
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void store_position_for_column(const char *name)
{
6053
  current_thd->lex->last_field->after=my_const_cast(char*) (name);
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}

bool
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add_proc_to_list(THD* thd, Item *item)
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{
  ORDER *order;
  Item	**item_ptr;

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  if (!(order = (ORDER *) thd->alloc(sizeof(ORDER)+sizeof(Item*))))
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    return 1;
  item_ptr = (Item**) (order+1);
  *item_ptr= item;
  order->item=item_ptr;
  order->free_me=0;
6068
  thd->lex->proc_list.link_in_list((uchar*) order,(uchar**) &order->next);
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  return 0;
}


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/**
  save order by and tables in own lists.
*/
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6076

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bool add_to_list(THD *thd, SQL_LIST &list,Item *item,bool asc)
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{
  ORDER *order;
  DBUG_ENTER("add_to_list");
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  if (!(order = (ORDER *) thd->alloc(sizeof(ORDER))))
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    DBUG_RETURN(1);
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  order->item_ptr= item;
  order->item= &order->item_ptr;
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  order->asc = asc;
  order->free_me=0;
  order->used=0;
6088
  order->counter_used= 0;
6089
  list.link_in_list((uchar*) order,(uchar**) &order->next);
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  DBUG_RETURN(0);
}


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/**
  Add a table to list of used tables.

  @param table		Table to add
  @param alias		alias for table (or null if no alias)
  @param table_options	A set of the following bits:
                         - TL_OPTION_UPDATING : Table will be updated
                         - TL_OPTION_FORCE_INDEX : Force usage of index
                         - TL_OPTION_ALIAS : an alias in multi table DELETE
  @param lock_type	How table should be locked
6104
  @param mdl_type       Type of metadata lock to acquire on the table.
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  @param use_index	List of indexed used in USE INDEX
  @param ignore_index	List of indexed used in IGNORE INDEX

  @retval
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      0		Error
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  @retval
    \#	Pointer to TABLE_LIST element added to the total table list
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*/

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TABLE_LIST *st_select_lex::add_table_to_list(THD *thd,
					     Table_ident *table,
6116
					     LEX_STRING *alias,
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					     ulong table_options,
					     thr_lock_type lock_type,
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					     enum_mdl_type mdl_type,
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					     List<Index_hint> *index_hints_arg,
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                                             LEX_STRING *option)
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{
  register TABLE_LIST *ptr;
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  TABLE_LIST *previous_table_ref; /* The table preceding the current one. */
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  char *alias_str;
6126
  LEX *lex= thd->lex;
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  DBUG_ENTER("add_table_to_list");
6128
  LINT_INIT(previous_table_ref);
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  if (!table)
    DBUG_RETURN(0);				// End of memory
  alias_str= alias ? alias->str : table->table.str;
6133
  if (!test(table_options & TL_OPTION_ALIAS) && 
6134
      check_table_name(table->table.str, table->table.length, FALSE))
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  {
6136
    my_error(ER_WRONG_TABLE_NAME, MYF(0), table->table.str);
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    DBUG_RETURN(0);
  }
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  if (table->is_derived_table() == FALSE && table->db.str &&
6141
      check_db_name(&table->db))
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  {
    my_error(ER_WRONG_DB_NAME, MYF(0), table->db.str);
    DBUG_RETURN(0);
  }
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  if (!alias)					/* Alias is case sensitive */
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  {
    if (table->sel)
    {
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      my_message(ER_DERIVED_MUST_HAVE_ALIAS,
                 ER(ER_DERIVED_MUST_HAVE_ALIAS), MYF(0));
6153 6154
      DBUG_RETURN(0);
    }
6155
    if (!(alias_str= (char*) thd->memdup(alias_str,table->table.length+1)))
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      DBUG_RETURN(0);
6157
  }
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  if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
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    DBUG_RETURN(0);				/* purecov: inspected */
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  if (table->db.str)
6161
  {
6162
    ptr->is_fqtn= TRUE;
6163 6164 6165
    ptr->db= table->db.str;
    ptr->db_length= table->db.length;
  }
6166
  else if (lex->copy_db_to(&ptr->db, &ptr->db_length))
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    DBUG_RETURN(0);
6168 6169
  else
    ptr->is_fqtn= FALSE;
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6171
  ptr->alias= alias_str;
6172
  ptr->is_alias= alias ? TRUE : FALSE;
6173
  if (lower_case_table_names && table->table.length)
6174
    table->table.length= my_casedn_str(files_charset_info, table->table.str);
6175 6176
  ptr->table_name=table->table.str;
  ptr->table_name_length=table->table.length;
6177
  ptr->lock_type=   lock_type;
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  ptr->updating=    test(table_options & TL_OPTION_UPDATING);
6179
  /* TODO: remove TL_OPTION_FORCE_INDEX as it looks like it's not used */
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  ptr->force_index= test(table_options & TL_OPTION_FORCE_INDEX);
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  ptr->ignore_leaves= test(table_options & TL_OPTION_IGNORE_LEAVES);
6182
  ptr->derived=	    table->sel;
6183
  if (!ptr->derived && is_infoschema_db(ptr->db, ptr->db_length))
6184
  {
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    ST_SCHEMA_TABLE *schema_table;
    if (ptr->updating &&
        /* Special cases which are processed by commands itself */
        lex->sql_command != SQLCOM_CHECK &&
        lex->sql_command != SQLCOM_CHECKSUM)
    {
      my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
               thd->security_ctx->priv_user,
               thd->security_ctx->priv_host,
               INFORMATION_SCHEMA_NAME.str);
      DBUG_RETURN(0);
    }
    schema_table= find_schema_table(thd, ptr->table_name);
6198 6199
    if (!schema_table ||
        (schema_table->hidden && 
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         ((sql_command_flags[lex->sql_command] & CF_STATUS_COMMAND) == 0 || 
6201 6202 6203
          /*
            this check is used for show columns|keys from I_S hidden table
          */
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          lex->sql_command == SQLCOM_SHOW_FIELDS ||
          lex->sql_command == SQLCOM_SHOW_KEYS)))
6206
    {
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      my_error(ER_UNKNOWN_TABLE, MYF(0),
6208
               ptr->table_name, INFORMATION_SCHEMA_NAME.str);
6209 6210
      DBUG_RETURN(0);
    }
6211
    ptr->schema_table_name= ptr->table_name;
6212 6213
    ptr->schema_table= schema_table;
  }
6214
  ptr->select_lex=  lex->current_select;
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  ptr->cacheable_table= 1;
6216
  ptr->index_hints= index_hints_arg;
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  ptr->option= option ? option->str : 0;
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  /* check that used name is unique */
6219
  if (lock_type != TL_IGNORE)
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  {
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    TABLE_LIST *first_table= (TABLE_LIST*) table_list.first;
    if (lex->sql_command == SQLCOM_CREATE_VIEW)
      first_table= first_table ? first_table->next_local : NULL;
    for (TABLE_LIST *tables= first_table ;
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	 tables ;
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VIEW  
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	 tables=tables->next_local)
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    {
6228 6229
      if (!my_strcasecmp(table_alias_charset, alias_str, tables->alias) &&
	  !strcmp(ptr->db, tables->db))
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      {
6231
	my_error(ER_NONUNIQ_TABLE, MYF(0), alias_str); /* purecov: tested */
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	DBUG_RETURN(0);				/* purecov: tested */
      }
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    }
  }
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  /* Store the table reference preceding the current one. */
  if (table_list.elements > 0)
  {
6239 6240 6241
    /*
      table_list.next points to the last inserted TABLE_LIST->next_local'
      element
6242
      We don't use the offsetof() macro here to avoid warnings from gcc
6243
    */
6244 6245 6246
    previous_table_ref= (TABLE_LIST*) ((char*) table_list.next -
                                       ((char*) &(ptr->next_local) -
                                        (char*) ptr));
6247 6248 6249 6250 6251 6252 6253 6254
    /*
      Set next_name_resolution_table of the previous table reference to point
      to the current table reference. In effect the list
      TABLE_LIST::next_name_resolution_table coincides with
      TABLE_LIST::next_local. Later this may be changed in
      store_top_level_join_columns() for NATURAL/USING joins.
    */
    previous_table_ref->next_name_resolution_table= ptr;
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  }
6256

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  /*
    Link the current table reference in a local list (list for current select).
    Notice that as a side effect here we set the next_local field of the
    previous table reference to 'ptr'. Here we also add one element to the
    list 'table_list'.
  */
6263
  table_list.link_in_list((uchar*) ptr, (uchar**) &ptr->next_local);
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  ptr->next_name_resolution_table= NULL;
6265
  /* Link table in global list (all used tables) */
6266
  lex->add_to_query_tables(ptr);
6267
  ptr->mdl_request.init(MDL_key::TABLE, ptr->db, ptr->table_name, mdl_type);
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  DBUG_RETURN(ptr);
}

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6271

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6272 6273
/**
  Initialize a new table list for a nested join.
6274

6275 6276 6277 6278 6279 6280 6281 6282
    The function initializes a structure of the TABLE_LIST type
    for a nested join. It sets up its nested join list as empty.
    The created structure is added to the front of the current
    join list in the st_select_lex object. Then the function
    changes the current nest level for joins to refer to the newly
    created empty list after having saved the info on the old level
    in the initialized structure.

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  @param thd         current thread

  @retval
    0   if success
  @retval
    1   otherwise
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*/

bool st_select_lex::init_nested_join(THD *thd)
{
  TABLE_LIST *ptr;
  NESTED_JOIN *nested_join;
  DBUG_ENTER("init_nested_join");
6296

6297 6298
  if (!(ptr= (TABLE_LIST*) thd->calloc(ALIGN_SIZE(sizeof(TABLE_LIST))+
                                       sizeof(NESTED_JOIN))))
6299
    DBUG_RETURN(1);
6300
  nested_join= ptr->nested_join=
6301
    ((NESTED_JOIN*) ((uchar*) ptr + ALIGN_SIZE(sizeof(TABLE_LIST))));
6302

6303 6304 6305
  join_list->push_front(ptr);
  ptr->embedding= embedding;
  ptr->join_list= join_list;
6306
  ptr->alias= (char*) "(nested_join)";
6307 6308 6309 6310 6311 6312 6313
  embedding= ptr;
  join_list= &nested_join->join_list;
  join_list->empty();
  DBUG_RETURN(0);
}


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/**
  End a nested join table list.
6316 6317 6318

    The function returns to the previous join nest level.
    If the current level contains only one member, the function
6319
    moves it one level up, eliminating the nest.
6320

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  @param thd         current thread

  @return
    - Pointer to TABLE_LIST element added to the total table list, if success
    - 0, otherwise
6326 6327 6328 6329 6330
*/

TABLE_LIST *st_select_lex::end_nested_join(THD *thd)
{
  TABLE_LIST *ptr;
6331
  NESTED_JOIN *nested_join;
6332
  DBUG_ENTER("end_nested_join");
6333

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  DBUG_ASSERT(embedding);
6335 6336 6337
  ptr= embedding;
  join_list= ptr->join_list;
  embedding= ptr->embedding;
6338
  nested_join= ptr->nested_join;
6339 6340 6341 6342 6343 6344 6345 6346 6347
  if (nested_join->join_list.elements == 1)
  {
    TABLE_LIST *embedded= nested_join->join_list.head();
    join_list->pop();
    embedded->join_list= join_list;
    embedded->embedding= embedding;
    join_list->push_front(embedded);
    ptr= embedded;
  }
6348
  else if (nested_join->join_list.elements == 0)
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  {
    join_list->pop();
6351
    ptr= 0;                                     // return value
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  }
6353 6354 6355 6356
  DBUG_RETURN(ptr);
}


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/**
  Nest last join operation.
6359 6360 6361

    The function nest last join operation as if it was enclosed in braces.

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  @param thd         current thread
6363

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  @retval
6365
    0  Error
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  @retval
    \#  Pointer to TABLE_LIST element created for the new nested join
6368 6369 6370 6371 6372 6373
*/

TABLE_LIST *st_select_lex::nest_last_join(THD *thd)
{
  TABLE_LIST *ptr;
  NESTED_JOIN *nested_join;
6374
  List<TABLE_LIST> *embedded_list;
6375
  DBUG_ENTER("nest_last_join");
6376

6377 6378
  if (!(ptr= (TABLE_LIST*) thd->calloc(ALIGN_SIZE(sizeof(TABLE_LIST))+
                                       sizeof(NESTED_JOIN))))
6379
    DBUG_RETURN(0);
6380
  nested_join= ptr->nested_join=
6381
    ((NESTED_JOIN*) ((uchar*) ptr + ALIGN_SIZE(sizeof(TABLE_LIST))));
6382

6383 6384
  ptr->embedding= embedding;
  ptr->join_list= join_list;
6385
  ptr->alias= (char*) "(nest_last_join)";
6386
  embedded_list= &nested_join->join_list;
6387
  embedded_list->empty();
6388 6389

  for (uint i=0; i < 2; i++)
6390 6391 6392 6393 6394
  {
    TABLE_LIST *table= join_list->pop();
    table->join_list= embedded_list;
    table->embedding= ptr;
    embedded_list->push_back(table);
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    if (table->natural_join)
    {
      ptr->is_natural_join= TRUE;
      /*
        If this is a JOIN ... USING, move the list of joined fields to the
        table reference that describes the join.
      */
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      if (prev_join_using)
        ptr->join_using_fields= prev_join_using;
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    }
6405 6406 6407 6408 6409 6410 6411
  }
  join_list->push_front(ptr);
  nested_join->used_tables= nested_join->not_null_tables= (table_map) 0;
  DBUG_RETURN(ptr);
}


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/**
  Add a table to the current join list.
6414 6415 6416 6417 6418 6419

    The function puts a table in front of the current join list
    of st_select_lex object.
    Thus, joined tables are put into this list in the reverse order
    (the most outer join operation follows first).

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  @param table       the table to add

  @return
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    None
*/

void st_select_lex::add_joined_table(TABLE_LIST *table)
{
  DBUG_ENTER("add_joined_table");
  join_list->push_front(table);
  table->join_list= join_list;
  table->embedding= embedding;
  DBUG_VOID_RETURN;
}


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/**
  Convert a right join into equivalent left join.
6438 6439

    The function takes the current join list t[0],t[1] ... and
6440 6441 6442 6443 6444 6445
    effectively converts it into the list t[1],t[0] ...
    Although the outer_join flag for the new nested table contains
    JOIN_TYPE_RIGHT, it will be handled as the inner table of a left join
    operation.

  EXAMPLES
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  @verbatim
6447 6448 6449 6450 6451 6452 6453 6454 6455 6456 6457
    SELECT * FROM t1 RIGHT JOIN t2 ON on_expr =>
      SELECT * FROM t2 LEFT JOIN t1 ON on_expr

    SELECT * FROM t1,t2 RIGHT JOIN t3 ON on_expr =>
      SELECT * FROM t1,t3 LEFT JOIN t2 ON on_expr

    SELECT * FROM t1,t2 RIGHT JOIN (t3,t4) ON on_expr =>
      SELECT * FROM t1,(t3,t4) LEFT JOIN t2 ON on_expr

    SELECT * FROM t1 LEFT JOIN t2 ON on_expr1 RIGHT JOIN t3  ON on_expr2 =>
      SELECT * FROM t3 LEFT JOIN (t1 LEFT JOIN t2 ON on_expr2) ON on_expr1
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   @endverbatim
6459

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  @param thd         current thread
6461

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  @return
    - Pointer to the table representing the inner table, if success
    - 0, otherwise
6465 6466
*/

6467
TABLE_LIST *st_select_lex::convert_right_join()
6468 6469
{
  TABLE_LIST *tab2= join_list->pop();
6470
  TABLE_LIST *tab1= join_list->pop();
6471 6472 6473 6474 6475 6476 6477 6478 6479
  DBUG_ENTER("convert_right_join");

  join_list->push_front(tab2);
  join_list->push_front(tab1);
  tab1->outer_join|= JOIN_TYPE_RIGHT;

  DBUG_RETURN(tab1);
}

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/**
  Set lock for all tables in current select level.
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  @param lock_type			Lock to set for tables
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  @note
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    If lock is a write lock, then tables->updating is set 1
    This is to get tables_ok to know that the table is updated by the
    query
*/

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6491
void st_select_lex::set_lock_for_tables(thr_lock_type lock_type)
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{
  bool for_update= lock_type >= TL_READ_NO_INSERT;
  DBUG_ENTER("set_lock_for_tables");
  DBUG_PRINT("enter", ("lock_type: %d  for_update: %d", lock_type,
		       for_update));
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6497 6498 6499
  for (TABLE_LIST *tables= (TABLE_LIST*) table_list.first;
       tables;
       tables= tables->next_local)
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6500 6501 6502
  {
    tables->lock_type= lock_type;
    tables->updating=  for_update;
6503 6504
    tables->mdl_request.set_type((lock_type >= TL_WRITE_ALLOW_WRITE) ?
                                 MDL_SHARED_WRITE : MDL_SHARED_READ);
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6505 6506 6507 6508
  }
  DBUG_VOID_RETURN;
}

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6509

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6510 6511
/**
  Create a fake SELECT_LEX for a unit.
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6512 6513 6514 6515

    The method create a fake SELECT_LEX object for a unit.
    This object is created for any union construct containing a union
    operation and also for any single select union construct of the form
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6516
    @verbatim
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6517
    (SELECT ... ORDER BY order_list [LIMIT n]) ORDER BY ... 
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6518
    @endvarbatim
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6519
    or of the form
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6520
    @varbatim
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6521
    (SELECT ... ORDER BY LIMIT n) ORDER BY ...
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6522
    @endvarbatim
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6523
  
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6524 6525 6526
  @param thd_arg		   thread handle

  @note
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6527 6528 6529
    The object is used to retrieve rows from the temporary table
    where the result on the union is obtained.

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6530
  @retval
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6531
    1     on failure to create the object
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6532
  @retval
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6533 6534 6535
    0     on success
*/

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6536
bool st_select_lex_unit::add_fake_select_lex(THD *thd_arg)
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6537 6538 6539 6540
{
  SELECT_LEX *first_sl= first_select();
  DBUG_ENTER("add_fake_select_lex");
  DBUG_ASSERT(!fake_select_lex);
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6541

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6542
  if (!(fake_select_lex= new (thd_arg->mem_root) SELECT_LEX()))
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6543 6544 6545 6546
      DBUG_RETURN(1);
  fake_select_lex->include_standalone(this, 
                                      (SELECT_LEX_NODE**)&fake_select_lex);
  fake_select_lex->select_number= INT_MAX;
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6547
  fake_select_lex->parent_lex= thd_arg->lex; /* Used in init_query. */
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6548 6549
  fake_select_lex->make_empty_select();
  fake_select_lex->linkage= GLOBAL_OPTIONS_TYPE;
6550 6551
  fake_select_lex->select_limit= 0;

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6552
  fake_select_lex->context.outer_context=first_sl->context.outer_context;
6553 6554 6555
  /* allow item list resolving in fake select for ORDER BY */
  fake_select_lex->context.resolve_in_select_list= TRUE;
  fake_select_lex->context.select_lex= fake_select_lex;
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6556

6557
  if (!is_union())
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6558 6559 6560 6561 6562 6563 6564 6565 6566
  {
    /* 
      This works only for 
      (SELECT ... ORDER BY list [LIMIT n]) ORDER BY order_list [LIMIT m],
      (SELECT ... LIMIT n) ORDER BY order_list [LIMIT m]
      just before the parser starts processing order_list
    */ 
    global_parameters= fake_select_lex;
    fake_select_lex->no_table_names_allowed= 1;
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6567
    thd_arg->lex->current_select= fake_select_lex;
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6568
  }
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6569
  thd_arg->lex->pop_context();
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6570 6571 6572
  DBUG_RETURN(0);
}

6573

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6574
/**
6575 6576
  Push a new name resolution context for a JOIN ... ON clause to the
  context stack of a query block.
unknown's avatar
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6577 6578

    Create a new name resolution context for a JOIN ... ON clause,
6579 6580 6581
    set the first and last leaves of the list of table references
    to be used for name resolution, and push the newly created
    context to the stack of contexts of the query.
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6582

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6583 6584 6585 6586 6587
  @param thd       pointer to current thread
  @param left_op   left  operand of the JOIN
  @param right_op  rigth operand of the JOIN

  @retval
6588
    FALSE  if all is OK
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6589
  @retval
6590
    TRUE   if a memory allocation error occured
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6591 6592
*/

6593 6594 6595
bool
push_new_name_resolution_context(THD *thd,
                                 TABLE_LIST *left_op, TABLE_LIST *right_op)
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6596 6597
{
  Name_resolution_context *on_context;
6598
  if (!(on_context= new (thd->mem_root) Name_resolution_context))
6599
    return TRUE;
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6600 6601 6602 6603 6604
  on_context->init();
  on_context->first_name_resolution_table=
    left_op->first_leaf_for_name_resolution();
  on_context->last_name_resolution_table=
    right_op->last_leaf_for_name_resolution();
6605
  return thd->lex->push_context(on_context);
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6606 6607 6608
}


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6609
/**
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6610 6611 6612 6613
  Add an ON condition to the second operand of a JOIN ... ON.

    Add an ON condition to the right operand of a JOIN ... ON clause.

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6614 6615
  @param b     the second operand of a JOIN ... ON
  @param expr  the condition to be added to the ON clause
unknown's avatar
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6616

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6617
  @retval
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6618
    FALSE  if there was some error
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6619
  @retval
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6620 6621 6622 6623
    TRUE   if all is OK
*/

void add_join_on(TABLE_LIST *b, Item *expr)
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6624
{
6625
  if (expr)
6626
  {
6627
    if (!b->on_expr)
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6628
      b->on_expr= expr;
6629 6630
    else
    {
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6631 6632 6633 6634 6635 6636
      /*
        If called from the parser, this happens if you have both a
        right and left join. If called later, it happens if we add more
        than one condition to the ON clause.
      */
      b->on_expr= new Item_cond_and(b->on_expr,expr);
6637 6638
    }
    b->on_expr->top_level_item();
6639
  }
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6640 6641 6642
}


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6643
/**
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6644 6645
  Mark that there is a NATURAL JOIN or JOIN ... USING between two
  tables.
6646

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6647 6648 6649 6650 6651 6652 6653 6654 6655 6656
    This function marks that table b should be joined with a either via
    a NATURAL JOIN or via JOIN ... USING. Both join types are special
    cases of each other, so we treat them together. The function
    setup_conds() creates a list of equal condition between all fields
    of the same name for NATURAL JOIN or the fields in 'using_fields'
    for JOIN ... USING. The list of equality conditions is stored
    either in b->on_expr, or in JOIN::conds, depending on whether there
    was an outer join.

  EXAMPLE
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6657
  @verbatim
6658 6659 6660
    SELECT * FROM t1 NATURAL LEFT JOIN t2
     <=>
    SELECT * FROM t1 LEFT JOIN t2 ON (t1.i=t2.i and t1.j=t2.j ... )
unknown's avatar
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6661

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6662 6663 6664
    SELECT * FROM t1 NATURAL JOIN t2 WHERE <some_cond>
     <=>
    SELECT * FROM t1, t2 WHERE (t1.i=t2.i and t1.j=t2.j and <some_cond>)
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6665

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6666 6667 6668
    SELECT * FROM t1 JOIN t2 USING(j) WHERE <some_cond>
     <=>
    SELECT * FROM t1, t2 WHERE (t1.j=t2.j and <some_cond>)
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6669 6670 6671 6672 6673
   @endverbatim

  @param a		  Left join argument
  @param b		  Right join argument
  @param using_fields    Field names from USING clause
6674 6675
*/

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6676 6677
void add_join_natural(TABLE_LIST *a, TABLE_LIST *b, List<String> *using_fields,
                      SELECT_LEX *lex)
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6678
{
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6679
  b->natural_join= a;
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6680
  lex->prev_join_using= using_fields;
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6681 6682
}

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6683

6684
/**
6685 6686
  Reload/resets privileges and the different caches.

6687 6688 6689 6690
  @param thd Thread handler (can be NULL!)
  @param options What should be reset/reloaded (tables, privileges, slave...)
  @param tables Tables to flush (if any)
  @param write_to_binlog True if we can write to the binlog.
6691
               
6692 6693 6694 6695 6696 6697 6698 6699
  @note Depending on 'options', it may be very bad to write the
    query to the binlog (e.g. FLUSH SLAVE); this is a
    pointer where reload_acl_and_cache() will put 0 if
    it thinks we really should not write to the binlog.
    Otherwise it will put 1.

  @return Error status code
    @retval 0 Ok
6700
    @retval !=0  Error; thd->killed is set or thd->is_error() is true
6701 6702
*/

6703 6704
bool reload_acl_and_cache(THD *thd, ulong options, TABLE_LIST *tables,
                          bool *write_to_binlog)
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unknown committed
6705 6706 6707
{
  bool result=0;
  select_errors=0;				/* Write if more errors */
6708
  bool tmp_write_to_binlog= 1;
6709

6710
  DBUG_ASSERT(!thd || !thd->in_sub_stmt);
6711

unknown's avatar
SCRUM  
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6712
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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6713 6714
  if (options & REFRESH_GRANT)
  {
6715 6716 6717 6718 6719 6720
    THD *tmp_thd= 0;
    /*
      If reload_acl_and_cache() is called from SIGHUP handler we have to
      allocate temporary THD for execution of acl_reload()/grant_reload().
    */
    if (!thd && (thd= (tmp_thd= new THD)))
6721 6722
    {
      thd->thread_stack= (char*) &tmp_thd;
6723
      thd->store_globals();
6724
    }
6725

6726 6727
    if (thd)
    {
6728 6729
      bool reload_acl_failed= acl_reload(thd);
      bool reload_grants_failed= grant_reload(thd);
Kristofer Pettersson's avatar
Kristofer Pettersson committed
6730
      bool reload_servers_failed= servers_reload(thd);
6731

Kristofer Pettersson's avatar
Kristofer Pettersson committed
6732
      if (reload_acl_failed || reload_grants_failed || reload_servers_failed)
6733
      {
6734
        result= 1;
6735 6736 6737 6738 6739 6740
        /*
          When an error is returned, my_message may have not been called and
          the client will hang waiting for a response.
        */
        my_error(ER_UNKNOWN_ERROR, MYF(0), "FLUSH PRIVILEGES failed");
      }
6741
    }
6742

6743 6744 6745 6746 6747 6748 6749
    if (tmp_thd)
    {
      delete tmp_thd;
      /* Remember that we don't have a THD */
      my_pthread_setspecific_ptr(THR_THD,  0);
      thd= 0;
    }
6750
    reset_mqh((LEX_USER *)NULL, TRUE);
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6751
  }
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SCRUM  
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6752
#endif
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6753 6754
  if (options & REFRESH_LOG)
  {
6755
    /*
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6756
      Flush the normal query log, the update log, the binary log,
unknown's avatar
unknown committed
6757 6758
      the slow query log, the relay log (if it exists) and the log
      tables.
6759
    */
unknown's avatar
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6760

6761 6762 6763 6764 6765 6766 6767 6768 6769 6770 6771 6772 6773 6774 6775 6776 6777 6778 6779 6780 6781 6782 6783 6784
    options|= REFRESH_BINARY_LOG;
    options|= REFRESH_RELAY_LOG;
    options|= REFRESH_SLOW_LOG;
    options|= REFRESH_GENERAL_LOG;
    options|= REFRESH_ENGINE_LOG;
    options|= REFRESH_ERROR_LOG;
  }

  if (options & REFRESH_ERROR_LOG)
    if (flush_error_log())
      result= 1;

  if ((options & REFRESH_SLOW_LOG) && opt_slow_log)
    logger.flush_slow_log();

  if ((options & REFRESH_GENERAL_LOG) && opt_log)
    logger.flush_general_log();

  if (options & REFRESH_ENGINE_LOG)
    if (ha_flush_logs(NULL))
      result= 1;

  if (options & REFRESH_BINARY_LOG)
  {
6785
    /*
unknown's avatar
unknown committed
6786 6787 6788 6789
      Writing this command to the binlog may result in infinite loops
      when doing mysqlbinlog|mysql, and anyway it does not really make
      sense to log it automatically (would cause more trouble to users
      than it would help them)
6790 6791
    */
    tmp_write_to_binlog= 0;
6792
    if (mysql_bin_log.is_open())
6793
      mysql_bin_log.rotate_and_purge(RP_FORCE_ROTATE);
6794 6795 6796
  }
  if (options & REFRESH_RELAY_LOG)
  {
unknown's avatar
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6797
#ifdef HAVE_REPLICATION
Marc Alff's avatar
Marc Alff committed
6798
    mysql_mutex_lock(&LOCK_active_mi);
6799
    rotate_relay_log(active_mi);
Marc Alff's avatar
Marc Alff committed
6800
    mysql_mutex_unlock(&LOCK_active_mi);
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6801
#endif
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6802
  }
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6803
#ifdef HAVE_QUERY_CACHE
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6804 6805
  if (options & REFRESH_QUERY_CACHE_FREE)
  {
unknown's avatar
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6806
    query_cache.pack();				// FLUSH QUERY CACHE
6807
    options &= ~REFRESH_QUERY_CACHE;    // Don't flush cache, just free memory
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6808 6809 6810
  }
  if (options & (REFRESH_TABLES | REFRESH_QUERY_CACHE))
  {
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6811
    query_cache.flush();			// RESET QUERY CACHE
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6812
  }
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6813
#endif /*HAVE_QUERY_CACHE*/
6814

6815 6816
  DBUG_ASSERT(!thd || thd->locked_tables_mode ||
              !thd->mdl_context.has_locks() ||
6817
              thd->handler_tables_hash.records ||
6818
              thd->global_read_lock.is_acquired());
6819

6820 6821 6822 6823 6824
  /*
    Note that if REFRESH_READ_LOCK bit is set then REFRESH_TABLES is set too
    (see sql_yacc.yy)
  */
  if (options & (REFRESH_TABLES | REFRESH_READ_LOCK)) 
unknown's avatar
unknown committed
6825
  {
6826
    if ((options & REFRESH_READ_LOCK) && thd)
unknown's avatar
unknown committed
6827
    {
6828
      /*
6829 6830 6831 6832
        On the first hand we need write lock on the tables to be flushed,
        on the other hand we must not try to aspire a global read lock
        if we have a write locked table as this would lead to a deadlock
        when trying to reopen (and re-lock) the table after the flush.
6833
      */
Konstantin Osipov's avatar
Konstantin Osipov committed
6834
      if (thd->locked_tables_mode)
6835
      {
6836 6837
        my_error(ER_LOCK_OR_ACTIVE_TRANSACTION, MYF(0));
        return 1;
6838
      }
unknown's avatar
unknown committed
6839 6840 6841 6842
      /*
	Writing to the binlog could cause deadlocks, as we don't log
	UNLOCK TABLES
      */
6843
      tmp_write_to_binlog= 0;
6844
      if (thd->global_read_lock.lock_global_read_lock(thd))
unknown's avatar
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6845
	return 1;                               // Killed
Kristofer Pettersson's avatar
Kristofer Pettersson committed
6846
      if (close_cached_tables(thd, tables, FALSE, (options & REFRESH_FAST) ?
6847
                              FALSE : TRUE))
6848 6849
          result= 1;
      
6850
      if (thd->global_read_lock.make_global_read_lock_block_commit(thd)) // Killed
6851 6852
      {
        /* Don't leave things in a half-locked state */
6853
        thd->global_read_lock.unlock_global_read_lock(thd);
6854 6855
        return 1;
      }
unknown's avatar
unknown committed
6856
    }
6857
    else
6858
    {
Konstantin Osipov's avatar
Konstantin Osipov committed
6859
      if (thd && thd->locked_tables_mode)
6860 6861 6862 6863 6864 6865 6866 6867
      {
        /*
          If we are under LOCK TABLES we should have a write
          lock on tables which we are going to flush.
        */
        if (tables)
        {
          for (TABLE_LIST *t= tables; t; t= t->next_local)
6868 6869
            if (!find_table_for_mdl_upgrade(thd->open_tables, t->db,
                                            t->table_name, FALSE))
6870 6871 6872 6873 6874 6875
              return 1;
        }
        else
        {
          for (TABLE *tab= thd->open_tables; tab; tab= tab->next)
          {
6876
            if (! tab->mdl_ticket->is_upgradable_or_exclusive())
6877 6878 6879 6880 6881 6882 6883 6884 6885
            {
              my_error(ER_TABLE_NOT_LOCKED_FOR_WRITE, MYF(0),
                       tab->s->table_name.str);
              return 1;
            }
          }
        }
      }

Kristofer Pettersson's avatar
Kristofer Pettersson committed
6886
      if (close_cached_tables(thd, tables, FALSE, (options & REFRESH_FAST) ?
6887
                              FALSE : TRUE))
6888 6889
        result= 1;
    }
unknown's avatar
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6890
    my_dbopt_cleanup();
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6891 6892 6893
  }
  if (options & REFRESH_HOSTS)
    hostname_cache_refresh();
unknown's avatar
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6894
  if (thd && (options & REFRESH_STATUS))
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6895
    refresh_status(thd);
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unknown committed
6896 6897
  if (options & REFRESH_THREADS)
    flush_thread_cache();
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6898
#ifdef HAVE_REPLICATION
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6899
  if (options & REFRESH_MASTER)
6900
  {
6901
    DBUG_ASSERT(thd);
6902
    tmp_write_to_binlog= 0;
6903
    if (reset_master(thd))
unknown's avatar
unknown committed
6904
    {
6905
      result=1;
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6906
    }
6907
  }
6908
#endif
unknown's avatar
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6909
#ifdef OPENSSL
6910 6911
   if (options & REFRESH_DES_KEY_FILE)
   {
6912 6913
     if (des_key_file && load_des_key_file(des_key_file))
         result= 1;
6914 6915
   }
#endif
unknown's avatar
unknown committed
6916
#ifdef HAVE_REPLICATION
6917 6918
 if (options & REFRESH_SLAVE)
 {
6919
   tmp_write_to_binlog= 0;
Marc Alff's avatar
Marc Alff committed
6920
   mysql_mutex_lock(&LOCK_active_mi);
6921
   if (reset_slave(thd, active_mi))
6922
     result=1;
Marc Alff's avatar
Marc Alff committed
6923
   mysql_mutex_unlock(&LOCK_active_mi);
6924
 }
6925
#endif
6926
 if (options & REFRESH_USER_RESOURCES)
6927
   reset_mqh((LEX_USER *) NULL, 0);             /* purecov: inspected */
unknown's avatar
unknown committed
6928
 *write_to_binlog= tmp_write_to_binlog;
6929 6930 6931
 /*
   If the query was killed then this function must fail.
 */
6932
 return result || (thd ? thd->killed : 0);
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6933 6934
}

6935

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6936 6937
/**
  kill on thread.
6938

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6939 6940 6941
  @param thd			Thread class
  @param id			Thread id
  @param only_kill_query        Should it kill the query or the connection
6942

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6943
  @note
6944 6945 6946
    This is written such that we have a short lock on LOCK_thread_count
*/

6947
uint kill_one_thread(THD *thd, ulong id, bool only_kill_query)
unknown's avatar
unknown committed
6948 6949 6950
{
  THD *tmp;
  uint error=ER_NO_SUCH_THREAD;
6951 6952
  DBUG_ENTER("kill_one_thread");
  DBUG_PRINT("enter", ("id=%lu only_kill=%d", id, only_kill_query));
Marc Alff's avatar
Marc Alff committed
6953
  mysql_mutex_lock(&LOCK_thread_count); // For unlink from list
6954
  I_List_iterator<THD> it(threads);
unknown's avatar
unknown committed
6955 6956
  while ((tmp=it++))
  {
unknown's avatar
unknown committed
6957 6958
    if (tmp->command == COM_DAEMON)
      continue;
unknown's avatar
unknown committed
6959 6960
    if (tmp->thread_id == id)
    {
Marc Alff's avatar
Marc Alff committed
6961
      mysql_mutex_lock(&tmp->LOCK_thd_data);    // Lock from delete
6962
      break;
unknown's avatar
unknown committed
6963 6964
    }
  }
Marc Alff's avatar
Marc Alff committed
6965
  mysql_mutex_unlock(&LOCK_thread_count);
6966 6967
  if (tmp)
  {
6968 6969 6970 6971 6972

    /*
      If we're SUPER, we can KILL anything, including system-threads.
      No further checks.

6973 6974 6975
      KILLer: thd->security_ctx->user could in theory be NULL while
      we're still in "unauthenticated" state. This is a theoretical
      case (the code suggests this could happen, so we play it safe).
6976

6977
      KILLee: tmp->security_ctx->user will be NULL for system threads.
6978
      We need to check so Jane Random User doesn't crash the server
6979 6980
      when trying to kill a) system threads or b) unauthenticated users'
      threads (Bug#43748).
6981

6982
      If user of both killer and killee are non-NULL, proceed with
6983 6984 6985
      slayage if both are string-equal.
    */

6986
    if ((thd->security_ctx->master_access & SUPER_ACL) ||
6987
        thd->security_ctx->user_matches(tmp->security_ctx))
6988
    {
unknown's avatar
SCRUM  
unknown committed
6989
      tmp->awake(only_kill_query ? THD::KILL_QUERY : THD::KILL_CONNECTION);
6990 6991 6992 6993
      error=0;
    }
    else
      error=ER_KILL_DENIED_ERROR;
Marc Alff's avatar
Marc Alff committed
6994
    mysql_mutex_unlock(&tmp->LOCK_thd_data);
6995
  }
6996 6997 6998 6999
  DBUG_PRINT("exit", ("%d", error));
  DBUG_RETURN(error);
}

7000

7001 7002 7003 7004 7005 7006 7007 7008 7009 7010 7011 7012 7013 7014
/*
  kills a thread and sends response

  SYNOPSIS
    sql_kill()
    thd			Thread class
    id			Thread id
    only_kill_query     Should it kill the query or the connection
*/

void sql_kill(THD *thd, ulong id, bool only_kill_query)
{
  uint error;
  if (!(error= kill_one_thread(thd, id, only_kill_query)))
7015
    my_ok(thd);
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  else
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    my_error(error, MYF(0), id);
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}

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/** If pointer is not a null pointer, append filename to it. */
7022

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bool append_file_to_dir(THD *thd, const char **filename_ptr,
                        const char *table_name)
7025
{
7026
  char buff[FN_REFLEN],*ptr, *end;
7027 7028 7029 7030 7031 7032 7033
  if (!*filename_ptr)
    return 0;					// nothing to do

  /* Check that the filename is not too long and it's a hard path */
  if (strlen(*filename_ptr)+strlen(table_name) >= FN_REFLEN-1 ||
      !test_if_hard_path(*filename_ptr))
  {
7034
    my_error(ER_WRONG_TABLE_NAME, MYF(0), *filename_ptr);
7035 7036 7037 7038
    return 1;
  }
  /* Fix is using unix filename format on dos */
  strmov(buff,*filename_ptr);
7039
  end=convert_dirname(buff, *filename_ptr, NullS);
7040
  if (!(ptr= (char*) thd->alloc((size_t) (end-buff) + strlen(table_name)+1)))
7041 7042
    return 1;					// End of memory
  *filename_ptr=ptr;
7043
  strxmov(ptr,buff,table_name,NullS);
7044 7045
  return 0;
}
7046

7047

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/**
  Check if the select is a simple select (not an union).
7050

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  @retval
7052
    0	ok
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  @retval
7054 7055 7056 7057 7058 7059
    1	error	; In this case the error messege is sent to the client
*/

bool check_simple_select()
{
  THD *thd= current_thd;
7060 7061
  LEX *lex= thd->lex;
  if (lex->current_select != &lex->select_lex)
7062 7063
  {
    char command[80];
7064
    Lex_input_stream *lip= & thd->m_parser_state->m_lip;
7065 7066
    strmake(command, lip->yylval->symbol.str,
	    min(lip->yylval->symbol.length, sizeof(command)-1));
7067
    my_error(ER_CANT_USE_OPTION_HERE, MYF(0), command);
7068 7069 7070 7071
    return 1;
  }
  return 0;
}
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Comp_creator *comp_eq_creator(bool invert)
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{
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  return invert?(Comp_creator *)&ne_creator:(Comp_creator *)&eq_creator;
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}

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Comp_creator *comp_ge_creator(bool invert)
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{
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  return invert?(Comp_creator *)&lt_creator:(Comp_creator *)&ge_creator;
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}

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Comp_creator *comp_gt_creator(bool invert)
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{
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  return invert?(Comp_creator *)&le_creator:(Comp_creator *)&gt_creator;
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}

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Comp_creator *comp_le_creator(bool invert)
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{
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  return invert?(Comp_creator *)&gt_creator:(Comp_creator *)&le_creator;
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}

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Comp_creator *comp_lt_creator(bool invert)
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{
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  return invert?(Comp_creator *)&ge_creator:(Comp_creator *)&lt_creator;
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}

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Comp_creator *comp_ne_creator(bool invert)
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{
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  return invert?(Comp_creator *)&eq_creator:(Comp_creator *)&ne_creator;
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}
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/**
  Construct ALL/ANY/SOME subquery Item.
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  @param left_expr   pointer to left expression
  @param cmp         compare function creator
  @param all         true if we create ALL subquery
  @param select_lex  pointer on parsed subquery structure
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  @return
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    constructed Item (or 0 if out of memory)
*/
Item * all_any_subquery_creator(Item *left_expr,
				chooser_compare_func_creator cmp,
				bool all,
				SELECT_LEX *select_lex)
{
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  if ((cmp == &comp_eq_creator) && !all)       //  = ANY <=> IN
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    return new Item_in_subselect(left_expr, select_lex);
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  if ((cmp == &comp_ne_creator) && all)        // <> ALL <=> NOT IN
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    return new Item_func_not(new Item_in_subselect(left_expr, select_lex));

  Item_allany_subselect *it=
7133
    new Item_allany_subselect(left_expr, cmp, select_lex, all);
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  if (all)
7135
    return it->upper_item= new Item_func_not_all(it);	/* ALL */
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7137
  return it->upper_item= new Item_func_nop_all(it);      /* ANY/SOME */
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}
7139 7140


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/**
  Multi update query pre-check.
7143

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  @param thd		Thread handler
  @param tables	Global/local table list (have to be the same)
7146

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  @retval
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    FALSE OK
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  @retval
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    TRUE  Error
7151
*/
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bool multi_update_precheck(THD *thd, TABLE_LIST *tables)
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{
  const char *msg= 0;
  TABLE_LIST *table;
  LEX *lex= thd->lex;
  SELECT_LEX *select_lex= &lex->select_lex;
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  DBUG_ENTER("multi_update_precheck");
7160 7161 7162

  if (select_lex->item_list.elements != lex->value_list.elements)
  {
7163
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
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    DBUG_RETURN(TRUE);
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  }
  /*
    Ensure that we have UPDATE or SELECT privilege for each table
    The exact privilege is checked in mysql_multi_update()
  */
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  for (table= tables; table; table= table->next_local)
7171
  {
7172 7173 7174
    if (table->derived)
      table->grant.privilege= SELECT_ACL;
    else if ((check_access(thd, UPDATE_ACL, table->db,
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7175 7176 7177
                           &table->grant.privilege,
                           &table->grant.m_internal,
                           0, 1) ||
7178
              check_grant(thd, UPDATE_ACL, table, FALSE, 1, TRUE)) &&
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             (check_access(thd, SELECT_ACL, table->db,
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7180 7181 7182
                           &table->grant.privilege,
                           &table->grant.m_internal,
                           0, 0) ||
7183
              check_grant(thd, SELECT_ACL, table, FALSE, 1, FALSE)))
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      DBUG_RETURN(TRUE);
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    table->table_in_first_from_clause= 1;
7187
  }
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  /*
    Is there tables of subqueries?
  */
7191
  if (&lex->select_lex != lex->all_selects_list)
7192
  {
7193
    DBUG_PRINT("info",("Checking sub query list"));
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    for (table= tables; table; table= table->next_global)
7195
    {
7196
      if (!table->table_in_first_from_clause)
7197 7198
      {
	if (check_access(thd, SELECT_ACL, table->db,
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7199 7200 7201
                         &table->grant.privilege,
                         &table->grant.m_internal,
                         0, 0) ||
7202
	    check_grant(thd, SELECT_ACL, table, FALSE, 1, FALSE))
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	  DBUG_RETURN(TRUE);
7204 7205 7206 7207 7208 7209
      }
    }
  }

  if (select_lex->order_list.elements)
    msg= "ORDER BY";
7210
  else if (select_lex->select_limit)
7211 7212 7213 7214
    msg= "LIMIT";
  if (msg)
  {
    my_error(ER_WRONG_USAGE, MYF(0), "UPDATE", msg);
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    DBUG_RETURN(TRUE);
7216
  }
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  DBUG_RETURN(FALSE);
7218 7219
}

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/**
  Multi delete query pre-check.
7222

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  @param thd			Thread handler
  @param tables		Global/local table list
7225

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  @retval
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    FALSE OK
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  @retval
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    TRUE  error
7230
*/
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7232
bool multi_delete_precheck(THD *thd, TABLE_LIST *tables)
7233 7234 7235
{
  SELECT_LEX *select_lex= &thd->lex->select_lex;
  TABLE_LIST *aux_tables=
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    (TABLE_LIST *)thd->lex->auxiliary_table_list.first;
7237
  TABLE_LIST **save_query_tables_own_last= thd->lex->query_tables_own_last;
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  DBUG_ENTER("multi_delete_precheck");
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7240 7241
  /* sql_yacc guarantees that tables and aux_tables are not zero */
  DBUG_ASSERT(aux_tables != 0);
7242
  if (check_table_access(thd, SELECT_ACL, tables, FALSE, UINT_MAX, FALSE))
7243 7244 7245 7246 7247 7248 7249 7250
    DBUG_RETURN(TRUE);

  /*
    Since aux_tables list is not part of LEX::query_tables list we
    have to juggle with LEX::query_tables_own_last value to be able
    call check_table_access() safely.
  */
  thd->lex->query_tables_own_last= 0;
7251
  if (check_table_access(thd, DELETE_ACL, aux_tables, FALSE, UINT_MAX, FALSE))
7252 7253
  {
    thd->lex->query_tables_own_last= save_query_tables_own_last;
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    DBUG_RETURN(TRUE);
7255 7256 7257
  }
  thd->lex->query_tables_own_last= save_query_tables_own_last;

7258
  if ((thd->variables.option_bits & OPTION_SAFE_UPDATES) && !select_lex->where)
7259
  {
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    my_message(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE,
               ER(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE), MYF(0));
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    DBUG_RETURN(TRUE);
7263
  }
7264 7265 7266 7267
  DBUG_RETURN(FALSE);
}


7268 7269 7270 7271 7272 7273 7274 7275 7276 7277 7278 7279 7280 7281 7282 7283 7284 7285 7286 7287 7288 7289 7290 7291 7292 7293 7294 7295 7296 7297 7298 7299 7300 7301 7302 7303 7304 7305 7306 7307 7308 7309 7310 7311 7312 7313 7314 7315 7316 7317 7318 7319 7320 7321 7322 7323 7324
/*
  Given a table in the source list, find a correspondent table in the
  table references list.

  @param lex Pointer to LEX representing multi-delete.
  @param src Source table to match.
  @param ref Table references list.

  @remark The source table list (tables listed before the FROM clause
  or tables listed in the FROM clause before the USING clause) may
  contain table names or aliases that must match unambiguously one,
  and only one, table in the target table list (table references list,
  after FROM/USING clause).

  @return Matching table, NULL otherwise.
*/

static TABLE_LIST *multi_delete_table_match(LEX *lex, TABLE_LIST *tbl,
                                            TABLE_LIST *tables)
{
  TABLE_LIST *match= NULL;
  DBUG_ENTER("multi_delete_table_match");

  for (TABLE_LIST *elem= tables; elem; elem= elem->next_local)
  {
    int cmp;

    if (tbl->is_fqtn && elem->is_alias)
      continue; /* no match */
    if (tbl->is_fqtn && elem->is_fqtn)
      cmp= my_strcasecmp(table_alias_charset, tbl->table_name, elem->table_name) ||
           strcmp(tbl->db, elem->db);
    else if (elem->is_alias)
      cmp= my_strcasecmp(table_alias_charset, tbl->alias, elem->alias);
    else
      cmp= my_strcasecmp(table_alias_charset, tbl->table_name, elem->table_name) ||
           strcmp(tbl->db, elem->db);

    if (cmp)
      continue;

    if (match)
    {
      my_error(ER_NONUNIQ_TABLE, MYF(0), elem->alias);
      DBUG_RETURN(NULL);
    }

    match= elem;
  }

  if (!match)
    my_error(ER_UNKNOWN_TABLE, MYF(0), tbl->table_name, "MULTI DELETE");

  DBUG_RETURN(match);
}


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/**
7326 7327 7328
  Link tables in auxilary table list of multi-delete with corresponding
  elements in main table list, and set proper locks for them.

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  @param lex   pointer to LEX representing multi-delete
7330

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  @retval
    FALSE   success
  @retval
    TRUE    error
7335 7336 7337 7338 7339 7340 7341 7342 7343 7344
*/

bool multi_delete_set_locks_and_link_aux_tables(LEX *lex)
{
  TABLE_LIST *tables= (TABLE_LIST*)lex->select_lex.table_list.first;
  TABLE_LIST *target_tbl;
  DBUG_ENTER("multi_delete_set_locks_and_link_aux_tables");

  lex->table_count= 0;

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  for (target_tbl= (TABLE_LIST *)lex->auxiliary_table_list.first;
7346
       target_tbl; target_tbl= target_tbl->next_local)
7347
  {
7348
    lex->table_count++;
7349
    /* All tables in aux_tables must be found in FROM PART */
7350
    TABLE_LIST *walk= multi_delete_table_match(lex, target_tbl, tables);
7351
    if (!walk)
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      DBUG_RETURN(TRUE);
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    if (!walk->derived)
    {
      target_tbl->table_name= walk->table_name;
      target_tbl->table_name_length= walk->table_name_length;
    }
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    walk->updating= target_tbl->updating;
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    walk->lock_type= target_tbl->lock_type;
7360 7361 7362
    /* We can assume that tables to be deleted from are locked for write. */
    DBUG_ASSERT(walk->lock_type >= TL_WRITE_ALLOW_WRITE);
    walk->mdl_request.set_type(MDL_SHARED_WRITE);
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7363
    target_tbl->correspondent_table= walk;	// Remember corresponding table
7364
  }
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  DBUG_RETURN(FALSE);
7366 7367 7368
}


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/**
  simple UPDATE query pre-check.
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  @param thd		Thread handler
  @param tables	Global table list
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7375
  @retval
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    FALSE OK
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  @retval
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    TRUE  Error
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*/
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bool update_precheck(THD *thd, TABLE_LIST *tables)
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{
  DBUG_ENTER("update_precheck");
  if (thd->lex->select_lex.item_list.elements != thd->lex->value_list.elements)
  {
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    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
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    DBUG_RETURN(TRUE);
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  }
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  DBUG_RETURN(check_one_table_access(thd, UPDATE_ACL, tables));
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}


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/**
  simple DELETE query pre-check.
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  @param thd		Thread handler
  @param tables	Global table list
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  @retval
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    FALSE  OK
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  @retval
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    TRUE   error
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*/
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bool delete_precheck(THD *thd, TABLE_LIST *tables)
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{
  DBUG_ENTER("delete_precheck");
  if (check_one_table_access(thd, DELETE_ACL, tables))
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    DBUG_RETURN(TRUE);
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  /* Set privilege for the WHERE clause */
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  tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
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  DBUG_RETURN(FALSE);
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}


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/**
  simple INSERT query pre-check.
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  @param thd		Thread handler
  @param tables	Global table list
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  @retval
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    FALSE  OK
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  @retval
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    TRUE   error
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*/
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bool insert_precheck(THD *thd, TABLE_LIST *tables)
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{
  LEX *lex= thd->lex;
  DBUG_ENTER("insert_precheck");

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  /*
    Check that we have modify privileges for the first table and
    select privileges for the rest
  */
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  ulong privilege= (INSERT_ACL |
                    (lex->duplicates == DUP_REPLACE ? DELETE_ACL : 0) |
                    (lex->value_list.elements ? UPDATE_ACL : 0));
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  if (check_one_table_access(thd, privilege, tables))
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    DBUG_RETURN(TRUE);
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  if (lex->update_list.elements != lex->value_list.elements)
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  {
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    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
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    DBUG_RETURN(TRUE);
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  }
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  DBUG_RETURN(FALSE);
7450
}
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/**
   Set proper open mode and table type for element representing target table
   of CREATE TABLE statement, also adjust statement table list if necessary.
*/

void create_table_set_open_action_and_adjust_tables(LEX *lex)
{
  TABLE_LIST *create_table= lex->query_tables;

  if (lex->create_info.options & HA_LEX_CREATE_TMP_TABLE)
    create_table->open_type= OT_TEMPORARY_ONLY;
  else if (!lex->select_lex.item_list.elements)
    create_table->open_type= OT_BASE_ONLY;

  if (!lex->select_lex.item_list.elements)
  {
    /*
      Avoid opening and locking target table for ordinary CREATE TABLE
      or CREATE TABLE LIKE for write (unlike in CREATE ... SELECT we
      won't do any insertions in it anyway). Not doing this causes
      problems when running CREATE TABLE IF NOT EXISTS for already
      existing log table.
    */
    create_table->lock_type= TL_READ;
  }
}


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/**
  CREATE TABLE query pre-check.
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  @param thd			Thread handler
  @param tables		Global table list
  @param create_table	        Table which will be created
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  @retval
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    FALSE   OK
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  @retval
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    TRUE   Error
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*/
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bool create_table_precheck(THD *thd, TABLE_LIST *tables,
                           TABLE_LIST *create_table)
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{
  LEX *lex= thd->lex;
7498 7499
  SELECT_LEX *select_lex= &lex->select_lex;
  ulong want_priv;
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  bool error= TRUE;                                 // Error message is given
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  DBUG_ENTER("create_table_precheck");
7502

7503 7504 7505 7506 7507
  /*
    Require CREATE [TEMPORARY] privilege on new table; for
    CREATE TABLE ... SELECT, also require INSERT.
  */

7508
  want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
7509 7510 7511
              CREATE_TMP_ACL : CREATE_ACL) |
             (select_lex->item_list.elements ? INSERT_ACL : 0);

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7512
  if (check_access(thd, want_priv, create_table->db,
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7513 7514 7515
                   &create_table->grant.privilege,
                   &create_table->grant.m_internal,
                   0, 0) ||
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      check_merge_table_access(thd, create_table->db,
			       (TABLE_LIST *)
			       lex->create_info.merge_list.first))
7519
    goto err;
7520
  if (want_priv != CREATE_TMP_ACL &&
7521
      check_grant(thd, want_priv, create_table, FALSE, 1, FALSE))
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    goto err;

  if (select_lex->item_list.elements)
  {
    /* Check permissions for used tables in CREATE TABLE ... SELECT */

7528 7529
#ifdef NOT_NECESSARY_TO_CHECK_CREATE_TABLE_EXIST_WHEN_PREPARING_STATEMENT
    /* This code throws an ill error for CREATE TABLE t1 SELECT * FROM t1 */
7530
    /*
7531
      Only do the check for PS, because we on execute we have to check that
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      against the opened tables to ensure we don't use a table that is part
      of the view (which can only be done after the table has been opened).
7534
    */
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    if (thd->stmt_arena->is_stmt_prepare_or_first_sp_execute())
7536
    {
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      /*
        For temporary tables we don't have to check if the created table exists
      */
      if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
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7541
          find_table_in_global_list(tables, create_table->db,
7542
                                    create_table->table_name))
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7543
      {
7544
	error= FALSE;
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        goto err;
      }
    }
7548
#endif
7549 7550
    if (tables && check_table_access(thd, SELECT_ACL, tables, FALSE,
                                     UINT_MAX, FALSE))
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      goto err;
  }
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7553 7554
  else if (lex->create_info.options & HA_LEX_CREATE_TABLE_LIKE)
  {
7555
    if (check_table_access(thd, SELECT_ACL, tables, FALSE, UINT_MAX, FALSE))
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      goto err;
  }
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merge  
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7558
  error= FALSE;
7559 7560 7561

err:
  DBUG_RETURN(error);
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7562
}
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7563 7564


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/**
  negate given expression.
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7567

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  @param thd  thread handler
  @param expr expression for negation
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7570

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  @return
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    negated expression
*/

Item *negate_expression(THD *thd, Item *expr)
{
  Item *negated;
  if (expr->type() == Item::FUNC_ITEM &&
      ((Item_func *) expr)->functype() == Item_func::NOT_FUNC)
  {
    /* it is NOT(NOT( ... )) */
    Item *arg= ((Item_func *) expr)->arguments()[0];
    enum_parsing_place place= thd->lex->current_select->parsing_place;
    if (arg->is_bool_func() || place == IN_WHERE || place == IN_HAVING)
      return arg;
    /*
      if it is not boolean function then we have to emulate value of
      not(not(a)), it will be a != 0
    */
    return new Item_func_ne(arg, new Item_int((char*) "0", 0, 1));
  }

  if ((negated= expr->neg_transformer(thd)) != 0)
    return negated;
  return new Item_func_not(expr);
}
7597

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7598 7599 7600
/**
  Set the specified definer to the default value, which is the
  current user in the thread.
7601
 
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  @param[in]  thd       thread handler
  @param[out] definer   definer
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*/
 
7606
void get_default_definer(THD *thd, LEX_USER *definer)
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{
  const Security_context *sctx= thd->security_ctx;

  definer->user.str= (char *) sctx->priv_user;
  definer->user.length= strlen(definer->user.str);

  definer->host.str= (char *) sctx->priv_host;
  definer->host.length= strlen(definer->host.str);
7615 7616 7617

  definer->password.str= NULL;
  definer->password.length= 0;
7618 7619
}

7620

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7621
/**
7622
  Create default definer for the specified THD.
7623

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  @param[in] thd         thread handler
7625

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  @return
    - On success, return a valid pointer to the created and initialized
7628
    LEX_USER, which contains definer information.
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    - On error, return 0.
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*/

LEX_USER *create_default_definer(THD *thd)
{
  LEX_USER *definer;

  if (! (definer= (LEX_USER*) thd->alloc(sizeof(LEX_USER))))
    return 0;

7639
  get_default_definer(thd, definer);
7640 7641 7642 7643 7644

  return definer;
}


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7645
/**
7646
  Create definer with the given user and host names.
7647

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7648 7649 7650
  @param[in] thd          thread handler
  @param[in] user_name    user name
  @param[in] host_name    host name
7651

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  @return
    - On success, return a valid pointer to the created and initialized
7654
    LEX_USER, which contains definer information.
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7655
    - On error, return 0.
7656 7657
*/

7658
LEX_USER *create_definer(THD *thd, LEX_STRING *user_name, LEX_STRING *host_name)
7659
{
7660 7661 7662 7663
  LEX_USER *definer;

  /* Create and initialize. */

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7664
  if (! (definer= (LEX_USER*) thd->alloc(sizeof(LEX_USER))))
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    return 0;

  definer->user= *user_name;
  definer->host= *host_name;
7669 7670
  definer->password.str= NULL;
  definer->password.length= 0;
7671 7672

  return definer;
7673
}
7674 7675


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7676
/**
7677 7678
  Retuns information about user or current user.

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7679 7680
  @param[in] thd          thread handler
  @param[in] user         user
7681

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7682 7683
  @return
    - On success, return a valid pointer to initialized
7684
    LEX_USER, which contains user information.
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7685
    - On error, return 0.
7686 7687 7688 7689 7690
*/

LEX_USER *get_current_user(THD *thd, LEX_USER *user)
{
  if (!user->user.str)  // current_user
7691 7692
    return create_default_definer(thd);

7693 7694
  return user;
}
7695 7696


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7697
/**
7698
  Check that byte length of a string does not exceed some limit.
7699

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  @param str         string to be checked
  @param err_msg     error message to be displayed if the string is too long
  @param max_length  max length
7703

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7704
  @retval
7705
    FALSE   the passed string is not longer than max_length
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  @retval
7707
    TRUE    the passed string is longer than max_length
7708 7709 7710

  NOTE
    The function is not used in existing code but can be useful later?
7711 7712
*/

7713 7714
bool check_string_byte_length(LEX_STRING *str, const char *err_msg,
                              uint max_byte_length)
7715
{
7716
  if (str->length <= max_byte_length)
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7717
    return FALSE;
7718

7719 7720 7721 7722 7723 7724 7725 7726 7727 7728 7729 7730 7731 7732 7733 7734 7735 7736 7737 7738 7739 7740 7741 7742 7743 7744 7745 7746 7747 7748 7749 7750
  my_error(ER_WRONG_STRING_LENGTH, MYF(0), str->str, err_msg, max_byte_length);

  return TRUE;
}


/*
  Check that char length of a string does not exceed some limit.

  SYNOPSIS
  check_string_char_length()
      str              string to be checked
      err_msg          error message to be displayed if the string is too long
      max_char_length  max length in symbols
      cs               string charset

  RETURN
    FALSE   the passed string is not longer than max_char_length
    TRUE    the passed string is longer than max_char_length
*/


bool check_string_char_length(LEX_STRING *str, const char *err_msg,
                              uint max_char_length, CHARSET_INFO *cs,
                              bool no_error)
{
  int well_formed_error;
  uint res= cs->cset->well_formed_len(cs, str->str, str->str + str->length,
                                      max_char_length, &well_formed_error);

  if (!well_formed_error &&  str->length == res)
    return FALSE;
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7751

7752
  if (!no_error)
7753 7754 7755 7756
  {
    ErrConvString err(str->str, str->length, cs);
    my_error(ER_WRONG_STRING_LENGTH, MYF(0), err.ptr(), err_msg, max_char_length);
  }
7757 7758
  return TRUE;
}
7759 7760


7761 7762 7763 7764 7765 7766 7767 7768 7769 7770 7771 7772
/*
  Check if path does not contain mysql data home directory
  SYNOPSIS
    test_if_data_home_dir()
    dir                     directory
    conv_home_dir           converted data home directory
    home_dir_len            converted data home directory length

  RETURN VALUES
    0	ok
    1	error  
*/
7773
C_MODE_START
7774

7775
int test_if_data_home_dir(const char *dir)
7776
{
7777
  char path[FN_REFLEN];
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Alexey Botchkov committed
7778
  int dir_len;
7779 7780 7781 7782 7783 7784 7785
  DBUG_ENTER("test_if_data_home_dir");

  if (!dir)
    DBUG_RETURN(0);

  (void) fn_format(path, dir, "", "",
                   (MY_RETURN_REAL_PATH|MY_RESOLVE_SYMLINKS));
7786 7787
  dir_len= strlen(path);
  if (mysql_unpacked_real_data_home_len<= dir_len)
7788
  {
7789 7790 7791 7792
    if (dir_len > mysql_unpacked_real_data_home_len &&
        path[mysql_unpacked_real_data_home_len] != FN_LIBCHAR)
      DBUG_RETURN(0);

7793 7794
    if (lower_case_file_system)
    {
7795 7796
      if (!my_strnncoll(default_charset_info, (const uchar*) path,
                        mysql_unpacked_real_data_home_len,
7797
                        (const uchar*) mysql_unpacked_real_data_home,
7798
                        mysql_unpacked_real_data_home_len))
7799 7800
        DBUG_RETURN(1);
    }
7801 7802
    else if (!memcmp(path, mysql_unpacked_real_data_home,
                     mysql_unpacked_real_data_home_len))
7803 7804 7805 7806 7807
      DBUG_RETURN(1);
  }
  DBUG_RETURN(0);
}

7808 7809
C_MODE_END

7810

7811 7812 7813 7814 7815 7816 7817 7818 7819 7820 7821 7822 7823 7824 7825
/**
  Check that host name string is valid.

  @param[in] str string to be checked

  @return             Operation status
    @retval  FALSE    host name is ok
    @retval  TRUE     host name string is longer than max_length or
                      has invalid symbols
*/

bool check_host_name(LEX_STRING *str)
{
  const char *name= str->str;
  const char *end= str->str + str->length;
Sergey Glukhov's avatar
Sergey Glukhov committed
7826
  if (check_string_byte_length(str, ER(ER_HOSTNAME), HOSTNAME_LENGTH))
7827 7828 7829 7830 7831 7832 7833 7834 7835 7836 7837 7838 7839 7840 7841
    return TRUE;

  while (name != end)
  {
    if (*name == '@')
    {
      my_printf_error(ER_UNKNOWN_ERROR, 
                      "Malformed hostname (illegal symbol: '%c')", MYF(0),
                      *name);
      return TRUE;
    }
    name++;
  }
  return FALSE;
}
Sergey Glukhov's avatar
Sergey Glukhov committed
7842 7843


7844 7845 7846 7847 7848 7849 7850 7851
extern int MYSQLparse(void *thd); // from sql_yacc.cc


/**
  This is a wrapper of MYSQLparse(). All the code should call parse_sql()
  instead of MYSQLparse().

  @param thd Thread context.
7852
  @param parser_state Parser state.
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7853
  @param creation_ctx Object creation context.
7854 7855 7856 7857 7858 7859

  @return Error status.
    @retval FALSE on success.
    @retval TRUE on parsing error.
*/

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7860
bool parse_sql(THD *thd,
7861
               Parser_state *parser_state,
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7862
               Object_creation_ctx *creation_ctx)
7863
{
7864
  bool ret_value;
7865
  DBUG_ASSERT(thd->m_parser_state == NULL);
7866

7867
  MYSQL_QUERY_PARSE_START(thd->query());
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  /* Backup creation context. */

  Object_creation_ctx *backup_ctx= NULL;

  if (creation_ctx)
    backup_ctx= creation_ctx->set_n_backup(thd);

7875
  /* Set parser state. */
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7876

7877
  thd->m_parser_state= parser_state;
7878

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7879 7880
  /* Parse the query. */

7881 7882
  bool mysql_parse_status= MYSQLparse(thd) != 0;

7883
  /* Check that if MYSQLparse() failed, thd->is_error() is set. */
7884 7885

  DBUG_ASSERT(!mysql_parse_status ||
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Staale Smedseng committed
7886
              (mysql_parse_status && thd->is_error()));
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7887

7888
  /* Reset parser state. */
7889

7890
  thd->m_parser_state= NULL;
7891

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  /* Restore creation context. */

  if (creation_ctx)
    creation_ctx->restore_env(thd, backup_ctx);

  /* That's it. */

7899 7900 7901
  ret_value= mysql_parse_status || thd->is_fatal_error;
  MYSQL_QUERY_PARSE_DONE(ret_value);
  return ret_value;
7902
}
7903 7904 7905 7906

/**
  @} (end of group Runtime_Environment)
*/
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#  
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7907 7908 7909 7910 7911 7912 7913 7914 7915 7916 7917 7918 7919 7920 7921 7922 7923 7924 7925 7926 7927 7928 7929 7930 7931 7932 7933 7934 7935 7936 7937 7938 7939 7940



/**
  Check and merge "CHARACTER SET cs [ COLLATE cl ]" clause

  @param cs character set pointer.
  @param cl collation pointer.

  Check if collation "cl" is applicable to character set "cs".

  If "cl" is NULL (e.g. when COLLATE clause is not specified),
  then simply "cs" is returned.
  
  @return Error status.
    @retval NULL, if "cl" is not applicable to "cs".
    @retval pointer to merged CHARSET_INFO on success.
*/


CHARSET_INFO*
merge_charset_and_collation(CHARSET_INFO *cs, CHARSET_INFO *cl)
{
  if (cl)
  {
    if (!my_charset_same(cs, cl))
    {
      my_error(ER_COLLATION_CHARSET_MISMATCH, MYF(0), cl->name, cs->csname);
      return NULL;
    }
    return cl;
  }
  return cs;
}