sql_parse.cc 230 KB
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/* Copyright (C) 2000-2003 MySQL AB
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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
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
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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 "mysql_priv.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 "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 "event_data_objects.h"
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#ifdef HAVE_OPENSSL
/*
  Without SSL the handshake consists of one packet. This packet
  has both client capabilites and scrambled password.
  With SSL the handshake might consist of two packets. If the first
  packet (client capabilities) has CLIENT_SSL flag set, we have to
  switch to SSL and read the second packet. The scrambled password
  is in the second packet and client_capabilites field will be ignored.
  Maybe it is better to accept flags other than CLIENT_SSL from the
  second packet?
*/
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#define SSL_HANDSHAKE_SIZE      2
#define NORMAL_HANDSHAKE_SIZE   6
#define MIN_HANDSHAKE_SIZE      2
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#else
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#define MIN_HANDSHAKE_SIZE      6
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#endif /* HAVE_OPENSSL */
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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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#ifdef SOLARIS
extern "C" int gethostname(char *name, int namelen);
#endif
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static void time_out_user_resource_limits(THD *thd, USER_CONN *uc);
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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static int check_for_max_user_connections(THD *thd, USER_CONN *uc);
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static void decrease_user_connections(USER_CONN *uc);
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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static bool check_multi_update_lock(THD *thd);
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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[]={
  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[]={
  "NON-EXISTING", "ACTIVE", "IDLE", "PREPARED"
};

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#ifdef __WIN__
static void  test_signal(int sig_ptr)
{
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#if !defined( DBUG_OFF)
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  MessageBox(NULL,"Test signal","DBUG",MB_OK);
#endif
}
static void init_signals(void)
{
  int signals[7] = {SIGINT,SIGILL,SIGFPE,SIGSEGV,SIGTERM,SIGBREAK,SIGABRT } ;
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  for (int i=0 ; i < 7 ; i++)
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    signal( signals[i], test_signal) ;
}
#endif

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static void unlock_locked_tables(THD *thd)
{
  if (thd->locked_tables)
  {
    thd->lock=thd->locked_tables;
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    thd->locked_tables=0;			// Will be automatically closed
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    close_thread_tables(thd);			// Free tables
  }
}

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bool end_active_trans(THD *thd)
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{
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  int error=0;
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  DBUG_ENTER("end_active_trans");
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  if (unlikely(thd->in_sub_stmt))
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  {
    my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0));
    DBUG_RETURN(1);
  }
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  if (thd->transaction.xid_state.xa_state != XA_NOTR)
  {
    my_error(ER_XAER_RMFAIL, MYF(0),
             xa_state_names[thd->transaction.xid_state.xa_state]);
    DBUG_RETURN(1);
  }
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  if (thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN |
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		      OPTION_TABLE_LOCK))
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  {
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    DBUG_PRINT("info",("options: 0x%lx", (ulong) thd->options));
    /* Safety if one did "drop table" on locked tables */
    if (!thd->locked_tables)
      thd->options&= ~OPTION_TABLE_LOCK;
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    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
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    if (ha_commit(thd))
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      error=1;
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  }
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  thd->options&= ~(OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE |
                   OPTION_KEEP_LOG);
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  DBUG_RETURN(error);
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}

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bool begin_trans(THD *thd)
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{
  int error=0;
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  if (unlikely(thd->in_sub_stmt))
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  {
    my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0));
    return 1;
  }
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  if (thd->locked_tables)
  {
    thd->lock=thd->locked_tables;
    thd->locked_tables=0;			// Will be automatically closed
    close_thread_tables(thd);			// Free tables
  }
  if (end_active_trans(thd))
    error= -1;
  else
  {
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    LEX *lex= thd->lex;
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    thd->options|= OPTION_BEGIN;
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    thd->server_status|= SERVER_STATUS_IN_TRANS;
    if (lex->start_transaction_opt & MYSQL_START_TRANS_OPT_WITH_CONS_SNAPSHOT)
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      error= ha_start_consistent_snapshot(thd);
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  }
  return error;
}
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#ifdef HAVE_REPLICATION
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/*
  Returns true if all tables should be ignored
*/
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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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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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static HASH hash_user_connections;

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static int get_or_create_user_conn(THD *thd, const char *user,
				   const char *host,
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				   USER_RESOURCES *mqh)
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{
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  int return_val= 0;
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  uint temp_len, user_len;
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  char temp_user[USER_HOST_BUFF_SIZE];
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  struct  user_conn *uc;

  DBUG_ASSERT(user != 0);
  DBUG_ASSERT(host != 0);

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  user_len= strlen(user);
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  temp_len= (strmov(strmov(temp_user, user)+1, host) - temp_user)+1;
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  (void) pthread_mutex_lock(&LOCK_user_conn);
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  if (!(uc = (struct  user_conn *) hash_search(&hash_user_connections,
					       (byte*) temp_user, temp_len)))
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  {
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    /* First connection for user; Create a user connection object */
    if (!(uc= ((struct user_conn*)
	       my_malloc(sizeof(struct user_conn) + temp_len+1,
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			 MYF(MY_WME)))))
    {
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      net_send_error(thd, 0, NullS);		// Out of memory
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      return_val= 1;
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      goto end;
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    }
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    uc->user=(char*) (uc+1);
    memcpy(uc->user,temp_user,temp_len+1);
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    uc->host= uc->user + user_len +  1;
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    uc->len= temp_len;
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    uc->connections= uc->questions= uc->updates= uc->conn_per_hour= 0;
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    uc->user_resources= *mqh;
    uc->intime= thd->thr_create_time;
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    if (my_hash_insert(&hash_user_connections, (byte*) uc))
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    {
      my_free((char*) uc,0);
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      net_send_error(thd, 0, NullS);		// Out of memory
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      return_val= 1;
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      goto end;
    }
  }
  thd->user_connect=uc;
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  uc->connections++;
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end:
  (void) pthread_mutex_unlock(&LOCK_user_conn);
  return return_val;
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}
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#endif /* !NO_EMBEDDED_ACCESS_CHECKS */
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/*
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  Check if user exist and password supplied is correct. 

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  SYNOPSIS
    check_user()
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    thd          thread handle, thd->security_ctx->{host,user,ip} are used
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    command      originator of the check: now check_user is called
                 during connect and change user procedures; used for 
                 logging.
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    passwd       scrambled password received from client
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    passwd_len   length of scrambled password
    db           database name to connect to, may be NULL
    check_count  dont know exactly

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    Note, that host, user and passwd may point to communication buffer.
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    Current implementation does not depend on that, but future changes
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    should be done with this in mind; 'thd' is INOUT, all other params
    are 'IN'.

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  RETURN VALUE
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    0  OK; thd->security_ctx->user/master_access/priv_user/db_access and
       thd->db are updated; OK is sent to client;
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   -1  access denied or handshake error; error is sent to client;
   >0  error, not sent to client
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*/

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int check_user(THD *thd, enum enum_server_command command, 
	       const char *passwd, uint passwd_len, const char *db,
	       bool check_count)
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{
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  DBUG_ENTER("check_user");
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#ifdef NO_EMBEDDED_ACCESS_CHECKS
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  thd->main_security_ctx.master_access= GLOBAL_ACLS;       // Full rights
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  /* Change database if necessary */
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  if (db && db[0])
  {
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    /*
      thd->db is saved in caller and needs to be freed by caller if this
      function returns 0
    */
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    thd->reset_db(NULL, 0);
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    if (mysql_change_db(thd, db, FALSE))
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    {
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      /* Send the error to the client */
      net_send_error(thd);
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      DBUG_RETURN(-1);
    }
  }
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  send_ok(thd);
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  DBUG_RETURN(0);
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#else

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  my_bool opt_secure_auth_local;
  pthread_mutex_lock(&LOCK_global_system_variables);
  opt_secure_auth_local= opt_secure_auth;
  pthread_mutex_unlock(&LOCK_global_system_variables);
  
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  /*
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    If the server is running in secure auth mode, short scrambles are 
    forbidden.
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  */
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  if (opt_secure_auth_local && passwd_len == SCRAMBLE_LENGTH_323)
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  {
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    net_printf_error(thd, ER_NOT_SUPPORTED_AUTH_MODE);
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    general_log_print(thd, COM_CONNECT, ER(ER_NOT_SUPPORTED_AUTH_MODE));
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    DBUG_RETURN(-1);
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  }
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  if (passwd_len != 0 &&
      passwd_len != SCRAMBLE_LENGTH &&
      passwd_len != SCRAMBLE_LENGTH_323)
    DBUG_RETURN(ER_HANDSHAKE_ERROR);
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  /*
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    Clear thd->db as it points to something, that will be freed when 
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    connection is closed. We don't want to accidentally free a wrong pointer
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    if connect failed. Also in case of 'CHANGE USER' failure, current
    database will be switched to 'no database selected'.
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  */
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  thd->reset_db(NULL, 0);

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  USER_RESOURCES ur;
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  int res= acl_getroot(thd, &ur, passwd, passwd_len);
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#ifndef EMBEDDED_LIBRARY
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  if (res == -1)
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  {
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    /*
      This happens when client (new) sends password scrambled with
      scramble(), but database holds old value (scrambled with
      scramble_323()). Here we please client to send scrambled_password
      in old format.
    */
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    NET *net= &thd->net;
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    if (opt_secure_auth_local)
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    {
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      net_printf_error(thd, ER_SERVER_IS_IN_SECURE_AUTH_MODE,
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                       thd->main_security_ctx.user,
                       thd->main_security_ctx.host_or_ip);
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      general_log_print(thd, COM_CONNECT, ER(ER_SERVER_IS_IN_SECURE_AUTH_MODE),
                        thd->main_security_ctx.user,
                        thd->main_security_ctx.host_or_ip);
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      DBUG_RETURN(-1);
    }
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    /* We have to read very specific packet size */
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    if (send_old_password_request(thd) ||
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        my_net_read(net) != SCRAMBLE_LENGTH_323 + 1)
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    {
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      inc_host_errors(&thd->remote.sin_addr);
      DBUG_RETURN(ER_HANDSHAKE_ERROR);
    }
    /* Final attempt to check the user based on reply */
    /* So as passwd is short, errcode is always >= 0 */
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    res= acl_getroot(thd, &ur, (char *) net->read_pos, SCRAMBLE_LENGTH_323);
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  }
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#endif /*EMBEDDED_LIBRARY*/
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  /* here res is always >= 0 */
  if (res == 0)
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  {
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    if (!(thd->main_security_ctx.master_access &
          NO_ACCESS)) // authentication is OK
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    {
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      DBUG_PRINT("info",
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                 ("Capabilities: %lx  packet_length: %ld  Host: '%s'  "
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                  "Login user: '%s' Priv_user: '%s'  Using password: %s "
                  "Access: %u  db: '%s'",
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                  thd->client_capabilities,
                  thd->max_client_packet_length,
                  thd->main_security_ctx.host_or_ip,
                  thd->main_security_ctx.user,
                  thd->main_security_ctx.priv_user,
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                  passwd_len ? "yes": "no",
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                  thd->main_security_ctx.master_access,
                  (thd->db ? thd->db : "*none*")));
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      if (check_count)
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      {
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        VOID(pthread_mutex_lock(&LOCK_thread_count));
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        bool count_ok= thread_count <= max_connections + delayed_insert_threads
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                       || (thd->main_security_ctx.master_access & SUPER_ACL);
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        VOID(pthread_mutex_unlock(&LOCK_thread_count));
        if (!count_ok)
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        {                                         // too many connections
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          net_send_error(thd, ER_CON_COUNT_ERROR);
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          DBUG_RETURN(-1);
        }
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      }
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      /* Why logging is performed before all checks've passed? */
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      general_log_print(thd, command,
                        (thd->main_security_ctx.priv_user ==
                         thd->main_security_ctx.user ?
                         (char*) "%s@%s on %s" :
                         (char*) "%s@%s as anonymous on %s"),
                        thd->main_security_ctx.user,
                        thd->main_security_ctx.host_or_ip,
                        db ? db : (char*) "");
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      /*
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        This is the default access rights for the current database.  It's
        set to 0 here because we don't have an active database yet (and we
        may not have an active database to set.
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      */
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      thd->main_security_ctx.db_access=0;
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      /* Don't allow user to connect if he has done too many queries */
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      if ((ur.questions || ur.updates || ur.conn_per_hour || ur.user_conn ||
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	   max_user_connections) &&
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	  get_or_create_user_conn(thd,
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            (opt_old_style_user_limits ? thd->main_security_ctx.user :
             thd->main_security_ctx.priv_user),
            (opt_old_style_user_limits ? thd->main_security_ctx.host_or_ip :
             thd->main_security_ctx.priv_host),
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            &ur))
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	DBUG_RETURN(-1);
      if (thd->user_connect &&
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	  (thd->user_connect->user_resources.conn_per_hour ||
	   thd->user_connect->user_resources.user_conn ||
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	   max_user_connections) &&
	  check_for_max_user_connections(thd, thd->user_connect))
	DBUG_RETURN(-1);
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      /* Change database if necessary */
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      if (db && db[0])
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      {
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        if (mysql_change_db(thd, db, FALSE))
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        {
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          /* Send error to the client */
          net_send_error(thd);
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          if (thd->user_connect)
            decrease_user_connections(thd->user_connect);
          DBUG_RETURN(-1);
        }
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      }
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      send_ok(thd);
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      thd->password= test(passwd_len);          // remember for error messages 
      /* Ready to handle queries */
      DBUG_RETURN(0);
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    }
  }
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  else if (res == 2) // client gave short hash, server has long hash
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  {
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    net_printf_error(thd, ER_NOT_SUPPORTED_AUTH_MODE);
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    general_log_print(thd, COM_CONNECT, ER(ER_NOT_SUPPORTED_AUTH_MODE));
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    DBUG_RETURN(-1);
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  }
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  net_printf_error(thd, ER_ACCESS_DENIED_ERROR,
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                   thd->main_security_ctx.user,
                   thd->main_security_ctx.host_or_ip,
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                   passwd_len ? ER(ER_YES) : ER(ER_NO));
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  general_log_print(thd, COM_CONNECT, ER(ER_ACCESS_DENIED_ERROR),
                    thd->main_security_ctx.user,
                    thd->main_security_ctx.host_or_ip,
                    passwd_len ? ER(ER_YES) : ER(ER_NO));
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  DBUG_RETURN(-1);
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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}

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/*
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  Check for maximum allowable user connections, if the mysqld server is
  started with corresponding variable that is greater then 0.
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*/

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extern "C" byte *get_key_conn(user_conn *buff, uint *length,
			      my_bool not_used __attribute__((unused)))
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{
  *length=buff->len;
  return (byte*) buff->user;
}

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extern "C" void free_user(struct user_conn *uc)
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{
  my_free((char*) uc,MYF(0));
}

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void init_max_user_conn(void)
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{
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  (void) hash_init(&hash_user_connections,system_charset_info,max_connections,
		   0,0,
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		   (hash_get_key) get_key_conn, (hash_free_key) free_user,
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		   0);
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#endif
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}


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/*
  check if user has already too many connections
  
  SYNOPSIS
  check_for_max_user_connections()
  thd			Thread handle
  uc			User connect object

  NOTES
    If check fails, we decrease user connection count, which means one
    shouldn't call decrease_user_connections() after this function.

  RETURN
    0	ok
    1	error
*/

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#ifndef NO_EMBEDDED_ACCESS_CHECKS

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static int check_for_max_user_connections(THD *thd, USER_CONN *uc)
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{
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  int error=0;
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  DBUG_ENTER("check_for_max_user_connections");
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  (void) pthread_mutex_lock(&LOCK_user_conn);
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  if (max_user_connections && !uc->user_resources.user_conn &&
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      max_user_connections < (uint) uc->connections)
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  {
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    net_printf_error(thd, ER_TOO_MANY_USER_CONNECTIONS, uc->user);
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    error=1;
    goto end;
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  }
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  time_out_user_resource_limits(thd, uc);
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  if (uc->user_resources.user_conn &&
      uc->user_resources.user_conn < uc->connections)
  {
    net_printf_error(thd, ER_USER_LIMIT_REACHED, uc->user,
                     "max_user_connections",
                     (long) uc->user_resources.user_conn);
    error= 1;
    goto end;
  }
  if (uc->user_resources.conn_per_hour &&
      uc->user_resources.conn_per_hour <= uc->conn_per_hour)
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  {
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    net_printf_error(thd, ER_USER_LIMIT_REACHED, uc->user,
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                     "max_connections_per_hour",
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                     (long) uc->user_resources.conn_per_hour);
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    error=1;
    goto end;
  }
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  uc->conn_per_hour++;
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  end:
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  if (error)
    uc->connections--; // no need for decrease_user_connections() here
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  (void) pthread_mutex_unlock(&LOCK_user_conn);
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  DBUG_RETURN(error);
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}

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/*
  Decrease user connection count

  SYNOPSIS
    decrease_user_connections()
    uc			User connection object

  NOTES
    If there is a n user connection object for a connection
    (which only happens if 'max_user_connections' is defined or
    if someone has created a resource grant for a user), then
    the connection count is always incremented on connect.

    The user connect object is not freed if some users has
    'max connections per hour' defined as we need to be able to hold
    count over the lifetime of the connection.
*/

598
static void decrease_user_connections(USER_CONN *uc)
599
{
600
  DBUG_ENTER("decrease_user_connections");
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  (void) pthread_mutex_lock(&LOCK_user_conn);
  DBUG_ASSERT(uc->connections);
  if (!--uc->connections && !mqh_used)
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  {
    /* Last connection for user; Delete it */
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    (void) hash_delete(&hash_user_connections,(byte*) uc);
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  }
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  (void) pthread_mutex_unlock(&LOCK_user_conn);
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  DBUG_VOID_RETURN;
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}

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#endif /* NO_EMBEDDED_ACCESS_CHECKS */

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void free_max_user_conn(void)
{
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  hash_free(&hash_user_connections);
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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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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void init_update_queries(void)
{
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  bzero((gptr) &sql_command_flags, sizeof(sql_command_flags));

  sql_command_flags[SQLCOM_CREATE_TABLE]=   CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_CREATE_INDEX]=   CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_ALTER_TABLE]=    CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_TRUNCATE]=       CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_DROP_TABLE]=     CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_LOAD]=           CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_CREATE_DB]=      CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_DROP_DB]=        CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_RENAME_TABLE]=   CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_BACKUP_TABLE]=   CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_RESTORE_TABLE]=  CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_DROP_INDEX]=     CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_CREATE_VIEW]=    CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_DROP_VIEW]=      CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_CREATE_EVENT]=   CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_ALTER_EVENT]=    CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_DROP_EVENT]=     CF_CHANGES_DATA;  

  sql_command_flags[SQLCOM_UPDATE]=	    CF_CHANGES_DATA | CF_HAS_ROW_COUNT;
  sql_command_flags[SQLCOM_UPDATE_MULTI]=   CF_CHANGES_DATA | CF_HAS_ROW_COUNT;
  sql_command_flags[SQLCOM_INSERT]=	    CF_CHANGES_DATA | CF_HAS_ROW_COUNT;
  sql_command_flags[SQLCOM_INSERT_SELECT]=  CF_CHANGES_DATA | CF_HAS_ROW_COUNT;
  sql_command_flags[SQLCOM_DELETE]=         CF_CHANGES_DATA | CF_HAS_ROW_COUNT;
  sql_command_flags[SQLCOM_DELETE_MULTI]=   CF_CHANGES_DATA | CF_HAS_ROW_COUNT;
  sql_command_flags[SQLCOM_REPLACE]=        CF_CHANGES_DATA | CF_HAS_ROW_COUNT;
  sql_command_flags[SQLCOM_REPLACE_SELECT]= CF_CHANGES_DATA | CF_HAS_ROW_COUNT;

  sql_command_flags[SQLCOM_SHOW_STATUS_PROC]= CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_STATUS_FUNC]= CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_STATUS]=      CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_DATABASES]=   CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_TRIGGERS]=    CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_EVENTS]=      CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_OPEN_TABLES]= CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_PLUGINS]=     CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_FIELDS]=      CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_KEYS]=        CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_VARIABLES]=   CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_CHARSETS]=    CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_COLLATIONS]=  CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_STATUS_PROC]= CF_STATUS_COMMAND;

  sql_command_flags[SQLCOM_SHOW_TABLES]=       (CF_STATUS_COMMAND |
                                                CF_SHOW_TABLE_COMMAND);
  sql_command_flags[SQLCOM_SHOW_TABLE_STATUS]= (CF_STATUS_COMMAND |
                                                CF_SHOW_TABLE_COMMAND);

  /*
    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.
  */
  sql_command_flags[SQLCOM_CALL]= 		CF_HAS_ROW_COUNT;
  sql_command_flags[SQLCOM_EXECUTE]= 		CF_HAS_ROW_COUNT;
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}

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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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/*
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  Reset per-hour user resource limits when it has been more than
  an hour since they were last checked
709

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  SYNOPSIS:
    time_out_user_resource_limits()
    thd			Thread handler
    uc			User connection details
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  NOTE:
    This assumes that the LOCK_user_conn mutex has been acquired, so it is
    safe to test and modify members of the USER_CONN structure.
*/
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static void time_out_user_resource_limits(THD *thd, USER_CONN *uc)
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{
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  time_t check_time = thd->start_time ?  thd->start_time : time(NULL);
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  DBUG_ENTER("time_out_user_resource_limits");
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  /* If more than a hour since last check, reset resource checking */
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  if (check_time  - uc->intime >= 3600)
  {
    uc->questions=1;
    uc->updates=0;
    uc->conn_per_hour=0;
    uc->intime=check_time;
  }
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  DBUG_VOID_RETURN;
}


/*
  Check if maximum queries per hour limit has been reached
  returns 0 if OK.
*/

static bool check_mqh(THD *thd, uint check_command)
{
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
  bool error= 0;
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  USER_CONN *uc=thd->user_connect;
  DBUG_ENTER("check_mqh");
  DBUG_ASSERT(uc != 0);

  (void) pthread_mutex_lock(&LOCK_user_conn);

  time_out_user_resource_limits(thd, uc);

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  /* Check that we have not done too many questions / hour */
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  if (uc->user_resources.questions &&
      uc->questions++ >= uc->user_resources.questions)
  {
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    net_printf_error(thd, ER_USER_LIMIT_REACHED, uc->user, "max_questions",
                     (long) uc->user_resources.questions);
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    error=1;
    goto end;
  }
764
  if (check_command < (uint) SQLCOM_END)
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  {
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    /* Check that we have not done too many updates / hour */
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    if (uc->user_resources.updates &&
        (sql_command_flags[check_command] & CF_CHANGES_DATA) &&
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	uc->updates++ >= uc->user_resources.updates)
    {
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      net_printf_error(thd, ER_USER_LIMIT_REACHED, uc->user, "max_updates",
                       (long) uc->user_resources.updates);
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      error=1;
      goto end;
    }
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  }
end:
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  (void) pthread_mutex_unlock(&LOCK_user_conn);
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  DBUG_RETURN(error);
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#else
  return (0);
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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}

785

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static void reset_mqh(LEX_USER *lu, bool get_them= 0)
787
{
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  (void) pthread_mutex_lock(&LOCK_user_conn);
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  if (lu)  // for GRANT
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  {
792
    USER_CONN *uc;
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    uint temp_len=lu->user.length+lu->host.length+2;
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    char temp_user[USER_HOST_BUFF_SIZE];
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    memcpy(temp_user,lu->user.str,lu->user.length);
    memcpy(temp_user+lu->user.length+1,lu->host.str,lu->host.length);
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    temp_user[lu->user.length]='\0'; temp_user[temp_len-1]=0;
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    if ((uc = (struct  user_conn *) hash_search(&hash_user_connections,
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						(byte*) temp_user, temp_len)))
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    {
      uc->questions=0;
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      get_mqh(temp_user,&temp_user[lu->user.length+1],uc);
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      uc->updates=0;
      uc->conn_per_hour=0;
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    }
  }
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  else
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  {
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    /* for FLUSH PRIVILEGES and FLUSH USER_RESOURCES */
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    for (uint idx=0;idx < hash_user_connections.records; idx++)
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    {
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      USER_CONN *uc=(struct user_conn *) hash_element(&hash_user_connections,
						      idx);
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      if (get_them)
	get_mqh(uc->user,uc->host,uc);
      uc->questions=0;
      uc->updates=0;
      uc->conn_per_hour=0;
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    }
  }
822
  (void) pthread_mutex_unlock(&LOCK_user_conn);
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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}
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void thd_init_client_charset(THD *thd, uint cs_number)
{
  /*
   Use server character set and collation if
   - opt_character_set_client_handshake is not set
   - client has not specified a character set
   - client character set is the same as the servers
   - client character set doesn't exists in server
  */
  if (!opt_character_set_client_handshake ||
      !(thd->variables.character_set_client= get_charset(cs_number, MYF(0))) ||
      !my_strcasecmp(&my_charset_latin1,
                     global_system_variables.character_set_client->name,
                     thd->variables.character_set_client->name))
  {
    thd->variables.character_set_client=
      global_system_variables.character_set_client;
    thd->variables.collation_connection=
      global_system_variables.collation_connection;
    thd->variables.character_set_results=
      global_system_variables.character_set_results;
  }
  else
  {
    thd->variables.character_set_results=
      thd->variables.collation_connection= 
      thd->variables.character_set_client;
  }
}


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/*
858
    Perform handshake, authorize client and update thd ACL variables.
859
  SYNOPSIS
860
    check_connection()
861
    thd  thread handle
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  RETURN
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     0  success, OK is sent to user, thd is updated.
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    -1  error, which is sent to user
   > 0  error code (not sent to user)
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*/

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#ifndef EMBEDDED_LIBRARY
static int check_connection(THD *thd)
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{
872
  uint connect_errors= 0;
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  NET *net= &thd->net;
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  ulong pkt_len= 0;
  char *end;
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  DBUG_PRINT("info",
             ("New connection received on %s", vio_description(net->vio)));
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#ifdef SIGNAL_WITH_VIO_CLOSE
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  thd->set_active_vio(net->vio);
881
#endif
882

883
  if (!thd->main_security_ctx.host)         // If TCP/IP connection
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  {
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    char ip[30];
886

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    if (vio_peer_addr(net->vio, ip, &thd->peer_port))
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      return (ER_BAD_HOST_ERROR);
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    if (!(thd->main_security_ctx.ip= my_strdup(ip,MYF(0))))
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      return (ER_OUT_OF_RESOURCES);
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    thd->main_security_ctx.host_or_ip= thd->main_security_ctx.ip;
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    vio_in_addr(net->vio,&thd->remote.sin_addr);
893
    if (!(specialflag & SPECIAL_NO_RESOLVE))
894
    {
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      vio_in_addr(net->vio,&thd->remote.sin_addr);
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      thd->main_security_ctx.host=
        ip_to_hostname(&thd->remote.sin_addr, &connect_errors);
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      /* Cut very long hostnames to avoid possible overflows */
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      if (thd->main_security_ctx.host)
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      {
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        if (thd->main_security_ctx.host != my_localhost)
          thd->main_security_ctx.host[min(strlen(thd->main_security_ctx.host),
                                          HOSTNAME_LENGTH)]= 0;
        thd->main_security_ctx.host_or_ip= thd->main_security_ctx.host;
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      }
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      if (connect_errors > max_connect_errors)
        return(ER_HOST_IS_BLOCKED);
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    }
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    DBUG_PRINT("info",("Host: %s  ip: %s",
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		       (thd->main_security_ctx.host ?
                        thd->main_security_ctx.host : "unknown host"),
		       (thd->main_security_ctx.ip ?
                        thd->main_security_ctx.ip : "unknown ip")));
    if (acl_check_host(thd->main_security_ctx.host, thd->main_security_ctx.ip))
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      return(ER_HOST_NOT_PRIVILEGED);
  }
917
  else /* Hostname given means that the connection was on a socket */
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  {
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    DBUG_PRINT("info",("Host: %s", thd->main_security_ctx.host));
    thd->main_security_ctx.host_or_ip= thd->main_security_ctx.host;
    thd->main_security_ctx.ip= 0;
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    /* Reset sin_addr */
    bzero((char*) &thd->remote, sizeof(thd->remote));
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  }
  vio_keepalive(net->vio, TRUE);
  {
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    /* buff[] needs to big enough to hold the server_version variable */
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    char buff[SERVER_VERSION_LENGTH + SCRAMBLE_LENGTH + 64];
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    ulong client_flags = (CLIENT_LONG_FLAG | CLIENT_CONNECT_WITH_DB |
			  CLIENT_PROTOCOL_41 | CLIENT_SECURE_CONNECTION);
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    if (opt_using_transactions)
      client_flags|=CLIENT_TRANSACTIONS;
#ifdef HAVE_COMPRESS
    client_flags |= CLIENT_COMPRESS;
#endif /* HAVE_COMPRESS */
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#ifdef HAVE_OPENSSL
    if (ssl_acceptor_fd)
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      client_flags |= CLIENT_SSL;       /* Wow, SSL is available! */
940
#endif /* HAVE_OPENSSL */
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    end= strnmov(buff, server_version, SERVER_VERSION_LENGTH) + 1;
    int4store((uchar*) end, thd->thread_id);
    end+= 4;
    /*
      So as check_connection is the only entry point to authorization
      procedure, scramble is set here. This gives us new scramble for
      each handshake.
    */
    create_random_string(thd->scramble, SCRAMBLE_LENGTH, &thd->rand);
    /*
      Old clients does not understand long scrambles, but can ignore packet
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      tail: that's why first part of the scramble is placed here, and second
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      part at the end of packet.
    */
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    end= strmake(end, thd->scramble, SCRAMBLE_LENGTH_323) + 1;
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    int2store(end, client_flags);
    /* write server characteristics: up to 16 bytes allowed */
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    end[2]=(char) default_charset_info->number;
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    int2store(end+3, thd->server_status);
    bzero(end+5, 13);
    end+= 18;
    /* write scramble tail */
    end= strmake(end, thd->scramble + SCRAMBLE_LENGTH_323, 
                 SCRAMBLE_LENGTH - SCRAMBLE_LENGTH_323) + 1;

    /* At this point we write connection message and read reply */
    if (net_write_command(net, (uchar) protocol_version, "", 0, buff,
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			  (uint) (end-buff)) ||
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	(pkt_len= my_net_read(net)) == packet_error ||
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	pkt_len < MIN_HANDSHAKE_SIZE)
    {
      inc_host_errors(&thd->remote.sin_addr);
      return(ER_HANDSHAKE_ERROR);
    }
  }
#ifdef _CUSTOMCONFIG_
#include "_cust_sql_parse.h"
#endif
  if (connect_errors)
    reset_host_errors(&thd->remote.sin_addr);
983
  if (thd->packet.alloc(thd->variables.net_buffer_length))
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984 985 986
    return(ER_OUT_OF_RESOURCES);

  thd->client_capabilities=uint2korr(net->read_pos);
987 988 989 990
  if (thd->client_capabilities & CLIENT_PROTOCOL_41)
  {
    thd->client_capabilities|= ((ulong) uint2korr(net->read_pos+2)) << 16;
    thd->max_client_packet_length= uint4korr(net->read_pos+4);
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991
    DBUG_PRINT("info", ("client_character_set: %d", (uint) net->read_pos[8]));
992
    thd_init_client_charset(thd, (uint) net->read_pos[8]);
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993
    thd->update_charset();
994
    end= (char*) net->read_pos+32;
995 996 997 998 999 1000 1001
  }
  else
  {
    thd->max_client_packet_length= uint3korr(net->read_pos+2);
    end= (char*) net->read_pos+5;
  }

1002
  if (thd->client_capabilities & CLIENT_IGNORE_SPACE)
1003
    thd->variables.sql_mode|= MODE_IGNORE_SPACE;
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1004
#ifdef HAVE_OPENSSL
1005
  DBUG_PRINT("info", ("client capabilities: %d", thd->client_capabilities));
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  if (thd->client_capabilities & CLIENT_SSL)
  {
    /* Do the SSL layering. */
1009 1010 1011 1012 1013
    if (!ssl_acceptor_fd)
    {
      inc_host_errors(&thd->remote.sin_addr);
      return(ER_HANDSHAKE_ERROR);
    }
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1014
    DBUG_PRINT("info", ("IO layer change in progress..."));
1015 1016
    if (sslaccept(ssl_acceptor_fd, net->vio, thd->variables.net_wait_timeout))
    {
1017
      DBUG_PRINT("error", ("Failed to accept new SSL connection"));
1018
      inc_host_errors(&thd->remote.sin_addr);
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1019
      return(ER_HANDSHAKE_ERROR);
1020
    }
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1021
    DBUG_PRINT("info", ("Reading user information over SSL layer"));
1022
    if ((pkt_len= my_net_read(net)) == packet_error ||
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1023 1024
	pkt_len < NORMAL_HANDSHAKE_SIZE)
    {
1025 1026
      DBUG_PRINT("error", ("Failed to read user information (pkt_len= %lu)",
			   pkt_len));
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1027 1028 1029 1030
      inc_host_errors(&thd->remote.sin_addr);
      return(ER_HANDSHAKE_ERROR);
    }
  }
1031 1032 1033
#endif

  if (end >= (char*) net->read_pos+ pkt_len +2)
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1034
  {
1035 1036
    inc_host_errors(&thd->remote.sin_addr);
    return(ER_HANDSHAKE_ERROR);
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1037 1038 1039
  }

  if (thd->client_capabilities & CLIENT_INTERACTIVE)
1040
    thd->variables.net_wait_timeout= thd->variables.net_interactive_timeout;
1041
  if ((thd->client_capabilities & CLIENT_TRANSACTIONS) &&
1042 1043
      opt_using_transactions)
    net->return_status= &thd->server_status;
1044
  net->read_timeout=(uint) thd->variables.net_read_timeout;
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1045

1046 1047
  char *user= end;
  char *passwd= strend(user)+1;
1048
  uint user_len= passwd - user - 1;
1049
  char *db= passwd;
1050 1051
  char db_buff[NAME_LEN + 1];           // buffer to store db in utf8
  char user_buff[USERNAME_LENGTH + 1];	// buffer to store user in utf8
1052 1053 1054
  uint dummy_errors;

  /*
1055 1056 1057 1058
    Old clients send null-terminated string as password; new clients send
    the size (1 byte) + string (not null-terminated). Hence in case of empty
    password both send '\0'.
  */
1059
  uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ?
1060 1061 1062
    *passwd++ : strlen(passwd);
  db= thd->client_capabilities & CLIENT_CONNECT_WITH_DB ?
    db + passwd_len + 1 : 0;
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  uint db_len= db ? strlen(db) : 0;

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  if (passwd + passwd_len + db_len > (char *)net->read_pos + pkt_len)
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  {
    inc_host_errors(&thd->remote.sin_addr);
    return ER_HANDSHAKE_ERROR;
  }
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1070

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1071 1072
  /* Since 4.1 all database names are stored in utf8 */
  if (db)
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1073
  {
1074 1075
    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
                             system_charset_info,
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1076
                             db, db_len,
1077
                             thd->charset(), &dummy_errors)]= 0;
1078
    db= db_buff;
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1079
  }
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1081 1082 1083
  user_buff[user_len= copy_and_convert(user_buff, sizeof(user_buff)-1,
                                       system_charset_info, user, user_len,
                                       thd->charset(), &dummy_errors)]= '\0';
1084
  user= user_buff;
1085

1086 1087 1088 1089 1090 1091 1092 1093
  /* If username starts and ends in "'", chop them off */
  if (user_len > 1 && user[0] == '\'' && user[user_len - 1] == '\'')
  {
    user[user_len-1]= 0;
    user++;
    user_len-= 2;
  }

1094 1095 1096
  if (thd->main_security_ctx.user)
    x_free(thd->main_security_ctx.user);
  if (!(thd->main_security_ctx.user= my_strdup(user, MYF(0))))
1097
    return (ER_OUT_OF_RESOURCES);
1098
  return check_user(thd, COM_CONNECT, passwd, passwd_len, db, TRUE);
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1099 1100
}

1101

1102 1103
void execute_init_command(THD *thd, sys_var_str *init_command_var,
			  rw_lock_t *var_mutex)
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1104 1105 1106 1107
{
  Vio* save_vio;
  ulong save_client_capabilities;

1108 1109 1110 1111 1112 1113 1114 1115 1116
  thd->proc_info= "Execution of init_command";
  /*
    We need to lock init_command_var because
    during execution of init_command_var query
    values of init_command_var can't be changed
  */
  rw_rdlock(var_mutex);
  thd->query= init_command_var->value;
  thd->query_length= init_command_var->value_length;
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1117 1118
  save_client_capabilities= thd->client_capabilities;
  thd->client_capabilities|= CLIENT_MULTI_QUERIES;
1119 1120 1121 1122
  /*
    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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1123 1124
  save_vio= thd->net.vio;
  thd->net.vio= 0;
1125
  thd->net.no_send_error= 0;
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1126
  dispatch_command(COM_QUERY, thd, thd->query, thd->query_length+1);
1127
  rw_unlock(var_mutex);
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1128 1129 1130 1131 1132
  thd->client_capabilities= save_client_capabilities;
  thd->net.vio= save_vio;
}


1133
pthread_handler_t handle_one_connection(void *arg)
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1134 1135 1136
{
  THD *thd=(THD*) arg;
  uint launch_time  =
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1137
    (uint) ((thd->thr_create_time = time(NULL)) - thd->connect_time);
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1138 1139 1140 1141 1142
  if (launch_time >= slow_launch_time)
    statistic_increment(slow_launch_threads,&LOCK_status );

  pthread_detach_this_thread();

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1143
#if !defined( __WIN__) // Win32 calls this in pthread_create
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1144
  /* The following calls needs to be done before we call DBUG_ macros */
1145
  if (!(test_flags & TEST_NO_THREADS) & my_thread_init())
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1146
  {
1147
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
1148
    statistic_increment(aborted_connects,&LOCK_status);
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1149 1150 1151 1152 1153
    end_thread(thd,0);
    return 0;
  }
#endif

1154 1155 1156 1157 1158 1159 1160
  /*
    handle_one_connection() is the only way a thread would start
    and would always be on top of the stack, therefore, the thread
    stack always starts at the address of the first local variable
    of handle_one_connection, which is thd. We need to know the
    start of the stack so that we could check for stack overruns.
  */
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1161 1162
  DBUG_PRINT("info", ("handle_one_connection called by thread %d\n",
		      thd->thread_id));
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1163
  /* now that we've called my_thread_init(), it is safe to call DBUG_* */
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1164

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1165
#if defined(__WIN__)
1166
  init_signals();
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1167
#elif !defined(__NETWARE__)
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1168 1169 1170 1171
  sigset_t set;
  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
#endif
1172
  thd->thread_stack= (char*) &thd;
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1173 1174
  if (thd->store_globals())
  {
1175
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
1176
    statistic_increment(aborted_connects,&LOCK_status);
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1177 1178 1179 1180 1181 1182 1183 1184
    end_thread(thd,0);
    return 0;
  }

  do
  {
    int error;
    NET *net= &thd->net;
1185
    Security_context *sctx= thd->security_ctx;
1186
    net->no_send_error= 0;
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1187

1188
    if ((error=check_connection(thd)))
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1189 1190
    {						// Wrong permissions
      if (error > 0)
1191
	net_printf_error(thd, error, sctx->host_or_ip);
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1192 1193
#ifdef __NT__
      if (vio_type(net->vio) == VIO_TYPE_NAMEDPIPE)
1194
	my_sleep(1000);				/* must wait after eof() */
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1195
#endif
1196
      statistic_increment(aborted_connects,&LOCK_status);
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1197 1198
      goto end_thread;
    }
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1199
#ifdef __NETWARE__
1200
    netware_reg_user(sctx->ip, sctx->user, "MySQL");
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1201
#endif
1202
    if (thd->variables.max_join_size == HA_POS_ERROR)
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1203 1204 1205 1206
      thd->options |= OPTION_BIG_SELECTS;
    if (thd->client_capabilities & CLIENT_COMPRESS)
      net->compress=1;				// Use compression

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1207
    thd->version= refresh_version;
1208
    thd->proc_info= 0;
1209
    thd->command= COM_SLEEP;
1210 1211
    thd->set_time();
    thd->init_for_queries();
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1212

1213
    if (sys_init_connect.value_length && !(sctx->master_access & SUPER_ACL))
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1214
    {
1215 1216
      execute_init_command(thd, &sys_init_connect, &LOCK_sys_init_connect);
      if (thd->query_error)
1217
      {
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1218
	thd->killed= THD::KILL_CONNECTION;
1219 1220 1221 1222 1223 1224
        sql_print_warning(ER(ER_NEW_ABORTING_CONNECTION),
                          thd->thread_id,(thd->db ? thd->db : "unconnected"),
                          sctx->user ? sctx->user : "unauthenticated",
                          sctx->host_or_ip, "init_connect command failed");
        sql_print_warning("%s", net->last_error);
      }
1225 1226 1227
      thd->proc_info=0;
      thd->set_time();
      thd->init_for_queries();
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1228 1229
    }

1230 1231
    while (!net->error && net->vio != 0 &&
           !(thd->killed == THD::KILL_CONNECTION))
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1232
    {
1233
      net->no_send_error= 0;
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1234 1235 1236
      if (do_command(thd))
	break;
    }
1237 1238
    if (thd->user_connect)
      decrease_user_connections(thd->user_connect);
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1239
    if (net->error && net->vio != 0 && net->report_error)
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1240
    {
1241
      if (!thd->killed && thd->variables.log_warnings > 1)
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1242
	sql_print_warning(ER(ER_NEW_ABORTING_CONNECTION),
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1243
                          thd->thread_id,(thd->db ? thd->db : "unconnected"),
1244 1245
                          sctx->user ? sctx->user : "unauthenticated",
                          sctx->host_or_ip,
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1246 1247
                          (net->last_errno ? ER(net->last_errno) :
                           ER(ER_UNKNOWN_ERROR)));
1248
      net_send_error(thd, net->last_errno, NullS);
1249
      statistic_increment(aborted_threads,&LOCK_status);
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1250
    }
1251 1252 1253 1254
    else if (thd->killed)
    {
      statistic_increment(aborted_threads,&LOCK_status);
    }
1255
    
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1256
end_thread:
1257
    close_connection(thd, 0, 1);
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1258 1259 1260 1261 1262 1263
    end_thread(thd,1);
    /*
      If end_thread returns, we are either running with --one-thread
      or this thread has been schedule to handle the next query
    */
    thd= current_thd;
1264
    thd->thread_stack= (char*) &thd;
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1265 1266 1267 1268 1269
  } while (!(test_flags & TEST_NO_THREADS));
  /* The following is only executed if we are not using --one-thread */
  return(0);					/* purecov: deadcode */
}

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1270 1271
#endif /* EMBEDDED_LIBRARY */

1272 1273 1274 1275
/*
  Execute commands from bootstrap_file.
  Used when creating the initial grant tables
*/
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1276

1277
pthread_handler_t handle_bootstrap(void *arg)
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1278
{
1279 1280 1281
  THD *thd=(THD*) arg;
  FILE *file=bootstrap_file;
  char *buff;
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1282

1283
  /* The following must be called before DBUG_ENTER */
1284
  thd->thread_stack= (char*) &thd;
1285
  if (my_thread_init() || thd->store_globals())
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1286
  {
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1287
#ifndef EMBEDDED_LIBRARY
1288
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
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1289
#endif
1290
    thd->fatal_error();
1291
    goto end;
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1292
  }
1293 1294
  DBUG_ENTER("handle_bootstrap");

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1295
#ifndef EMBEDDED_LIBRARY
1296 1297
  pthread_detach_this_thread();
  thd->thread_stack= (char*) &thd;
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1298
#if !defined(__WIN__) && !defined(__NETWARE__)
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1299
  sigset_t set;
1300 1301
  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
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1302
#endif
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1303
#endif /* EMBEDDED_LIBRARY */
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1304

1305
  if (thd->variables.max_join_size == HA_POS_ERROR)
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1306 1307 1308 1309
    thd->options |= OPTION_BIG_SELECTS;

  thd->proc_info=0;
  thd->version=refresh_version;
1310 1311
  thd->security_ctx->priv_user=
    thd->security_ctx->user= (char*) my_strdup("boot", MYF(MY_WME));
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1312
  thd->security_ctx->priv_host[0]=0;
1313 1314 1315 1316 1317 1318
  /*
    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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1319

1320
  buff= (char*) thd->net.buff;
1321
  thd->init_for_queries();
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1322 1323
  while (fgets(buff, thd->net.max_packet, file))
  {
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1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343
   ulong length= (ulong) strlen(buff);
   while (buff[length-1] != '\n' && !feof(file))
   {
     /*
       We got only a part of the current string. Will try to increase
       net buffer then read the rest of the current string.
     */
     if (net_realloc(&(thd->net), 2 * thd->net.max_packet))
     {
       net_send_error(thd, ER_NET_PACKET_TOO_LARGE, NullS);
       thd->fatal_error();
       break;
     }
     buff= (char*) thd->net.buff;
     fgets(buff + length, thd->net.max_packet - length, file);
     length+= (ulong) strlen(buff + length);
   }
   if (thd->is_fatal_error)
     break;

1344
    while (length && (my_isspace(thd->charset(), buff[length-1]) ||
1345
           buff[length-1] == ';'))
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1346 1347
      length--;
    buff[length]=0;
1348
    thd->query_length=length;
1349 1350
    thd->query= thd->memdup_w_gap(buff, length+1, 
				  thd->db_length+1+QUERY_CACHE_FLAGS_SIZE);
1351
    thd->query[length] = '\0';
1352 1353 1354 1355
    /*
      We don't need to obtain LOCK_thread_count here because in bootstrap
      mode we have only one thread.
    */
1356
    thd->query_id=next_query_id();
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1357 1358
    mysql_parse(thd,thd->query,length);
    close_thread_tables(thd);			// Free tables
1359
    if (thd->is_fatal_error)
1360
      break;
1361
    free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
1362
#ifdef USING_TRANSACTIONS
1363
    free_root(&thd->transaction.mem_root,MYF(MY_KEEP_PREALLOC));
1364
#endif
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1365
  }
1366 1367 1368

  /* thd->fatal_error should be set in case something went wrong */
end:
1369 1370 1371 1372 1373 1374
  bootstrap_error= thd->is_fatal_error;

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

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1375
#ifndef EMBEDDED_LIBRARY
1376 1377 1378
  (void) pthread_mutex_lock(&LOCK_thread_count);
  thread_count--;
  (void) pthread_mutex_unlock(&LOCK_thread_count);
1379
  (void) pthread_cond_broadcast(&COND_thread_count);
1380 1381
  my_thread_end();
  pthread_exit(0);
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1382
#endif
1383
  DBUG_RETURN(0);
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1384 1385 1386
}


1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401
/* 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;
}

/* This works because items are allocated with sql_alloc() */
1402 1403 1404

void cleanup_items(Item *item)
{
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1405
  DBUG_ENTER("cleanup_items");  
1406 1407
  for (; item ; item=item->next)
    item->cleanup();
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1408
  DBUG_VOID_RETURN;
1409 1410
}

1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430
/*
  Handle COM_TABLE_DUMP command

  SYNOPSIS
    mysql_table_dump
      thd           thread handle
      db            database name or an empty string. If empty,
                    the current database of the connection is used
      tbl_name      name of the table to dump

  NOTES
    This function is written to handle one specific command only.

  RETURN VALUE
    0               success
    1               error, the error message is set in THD
*/

static
int mysql_table_dump(THD* thd, char* db, char* tbl_name)
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1431 1432 1433 1434 1435 1436
{
  TABLE* table;
  TABLE_LIST* table_list;
  int error = 0;
  DBUG_ENTER("mysql_table_dump");
  db = (db && db[0]) ? db : thd->db;
1437
  if (!(table_list = (TABLE_LIST*) thd->calloc(sizeof(TABLE_LIST))))
1438
    DBUG_RETURN(1); // out of memory
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VIEW  
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1439
  table_list->db= db;
1440
  table_list->table_name= table_list->alias= tbl_name;
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VIEW  
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1441 1442
  table_list->lock_type= TL_READ_NO_INSERT;
  table_list->prev_global= &table_list;	// can be removed after merge with 4.1
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1443

1444 1445
  if (!db || check_db_name(db))
  {
1446
    my_error(ER_WRONG_DB_NAME ,MYF(0), db ? db : "NULL");
1447 1448
    goto err;
  }
1449
  if (lower_case_table_names)
1450
    my_casedn_str(files_charset_info, tbl_name);
1451 1452 1453 1454

  if (!(table=open_ltable(thd, table_list, TL_READ_NO_INSERT)))
    DBUG_RETURN(1);

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1455
  if (check_one_table_access(thd, SELECT_ACL, table_list))
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1456 1457
    goto err;
  thd->free_list = 0;
1458
  thd->query_length=(uint) strlen(tbl_name);
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1459
  thd->query = tbl_name;
1460
  if ((error = mysqld_dump_create_info(thd, table_list, -1)))
1461
  {
1462
    my_error(ER_GET_ERRNO, MYF(0), my_errno);
1463 1464
    goto err;
  }
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1465
  net_flush(&thd->net);
1466
  if ((error= table->file->dump(thd,-1)))
1467
    my_error(ER_GET_ERRNO, MYF(0), error);
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1468

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err:
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1470
  DBUG_RETURN(error);
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1471 1472
}

1473 1474 1475 1476
/*
  Ends the current transaction and (maybe) begin the next

  SYNOPSIS
1477
    end_trans()
1478 1479 1480 1481 1482 1483 1484
      thd            Current thread
      completion     Completion type

  RETURN
    0 - OK
*/

1485
int end_trans(THD *thd, enum enum_mysql_completiontype completion)
1486 1487 1488
{
  bool do_release= 0;
  int res= 0;
1489
  DBUG_ENTER("end_trans");
1490

1491
  if (unlikely(thd->in_sub_stmt))
1492 1493 1494 1495
  {
    my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0));
    DBUG_RETURN(1);
  }
1496 1497 1498 1499 1500 1501
  if (thd->transaction.xid_state.xa_state != XA_NOTR)
  {
    my_error(ER_XAER_RMFAIL, MYF(0),
             xa_state_names[thd->transaction.xid_state.xa_state]);
    DBUG_RETURN(1);
  }
1502 1503 1504 1505 1506 1507 1508 1509
  switch (completion) {
  case COMMIT:
    /*
     We don't use end_active_trans() here to ensure that this works
     even if there is a problem with the OPTION_AUTO_COMMIT flag
     (Which of course should never happen...)
    */
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
1510
    res= ha_commit(thd);
1511 1512
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE |
                             OPTION_KEEP_LOG);
1513 1514
    break;
  case COMMIT_RELEASE:
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1515
    do_release= 1; /* fall through */
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  case COMMIT_AND_CHAIN:
    res= end_active_trans(thd);
    if (!res && completion == COMMIT_AND_CHAIN)
      res= begin_trans(thd);
    break;
  case ROLLBACK_RELEASE:
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1522
    do_release= 1; /* fall through */
1523 1524 1525 1526
  case ROLLBACK:
  case ROLLBACK_AND_CHAIN:
  {
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
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1527
    if (ha_rollback(thd))
1528
      res= -1;
1529 1530
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE |
                             OPTION_KEEP_LOG);
1531 1532 1533 1534 1535 1536 1537 1538 1539
    if (!res && (completion == ROLLBACK_AND_CHAIN))
      res= begin_trans(thd);
    break;
  }
  default:
    res= -1;
    my_error(ER_UNKNOWN_COM_ERROR, MYF(0));
    DBUG_RETURN(-1);
  }
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1540

1541 1542 1543
  if (res < 0)
    my_error(thd->killed_errno(), MYF(0));
  else if ((res == 0) && do_release)
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1544 1545
    thd->killed= THD::KILL_CONNECTION;

1546 1547
  DBUG_RETURN(res);
}
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1548

1549
#ifndef EMBEDDED_LIBRARY
1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560

/*
  Read one command from socket and execute it (query or simple command).
  This function is called in loop from thread function.
  SYNOPSIS
    do_command()
  RETURN VALUE
    0  success
    1  request of thread shutdown (see dispatch_command() description)
*/

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1561 1562 1563
bool do_command(THD *thd)
{
  char *packet;
1564 1565
  uint old_timeout;
  ulong packet_length;
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1566 1567 1568 1569 1570
  NET *net;
  enum enum_server_command command;
  DBUG_ENTER("do_command");

  net= &thd->net;
1571 1572 1573 1574
  /*
    indicator of uninitialized lex => normal flow of errors handling
    (see my_message_sql)
  */
1575
  thd->lex->current_select= 0;
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1576 1577

  packet=0;
1578
  old_timeout=net->read_timeout;
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1579
  /* Wait max for 8 hours */
1580
  net->read_timeout=(uint) thd->variables.net_wait_timeout;
1581
  thd->clear_error();				// Clear error message
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1582 1583 1584 1585

  net_new_transaction(net);
  if ((packet_length=my_net_read(net)) == packet_error)
  {
1586 1587 1588 1589 1590
    DBUG_PRINT("info",("Got error %d reading command from socket %s",
		       net->error,
		       vio_description(net->vio)));
    /* Check if we can continue without closing the connection */
    if (net->error != 3)
1591 1592
    {
      statistic_increment(aborted_threads,&LOCK_status);
1593
      DBUG_RETURN(TRUE);			// We have to close it.
1594
    }
1595
    net_send_error(thd, net->last_errno, NullS);
1596
    net->error= 0;
1597
    DBUG_RETURN(FALSE);
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1598 1599 1600 1601 1602
  }
  else
  {
    packet=(char*) net->read_pos;
    command = (enum enum_server_command) (uchar) packet[0];
1603 1604
    if (command >= COM_END)
      command= COM_END;				// Wrong command
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1605 1606 1607
    DBUG_PRINT("info",("Command on %s = %d (%s)",
		       vio_description(net->vio), command,
		       command_name[command]));
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1608
  }
1609
  net->read_timeout=old_timeout;		// restore it
1610 1611 1612 1613 1614 1615 1616 1617 1618
  /*
    packet_length contains length of data, as it was stored in packet
    header. In case of malformed header, packet_length can be zero.
    If packet_length is not zero, my_net_read ensures that this number
    of bytes was actually read from network. Additionally my_net_read
    sets packet[packet_length]= 0 (thus if packet_length == 0,
    command == packet[0] == COM_SLEEP).
    In dispatch_command packet[packet_length] points beyond the end of packet.
  */
1619
  DBUG_RETURN(dispatch_command(command,thd, packet+1, (uint) packet_length));
1620
}
1621
#endif  /* EMBEDDED_LIBRARY */
1622

1623

1624 1625
/*
   Perform one connection-level (COM_XXXX) command.
1626

1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639
  SYNOPSIS
    dispatch_command()
    thd             connection handle
    command         type of command to perform 
    packet          data for the command, packet is always null-terminated
    packet_length   length of packet + 1 (to show that data is
                    null-terminated) except for COM_SLEEP, where it
                    can be zero.
  RETURN VALUE
    0   ok
    1   request of thread shutdown, i. e. if command is
        COM_QUIT/COM_SHUTDOWN
*/
1640

1641 1642 1643 1644
bool dispatch_command(enum enum_server_command command, THD *thd,
		      char* packet, uint packet_length)
{
  NET *net= &thd->net;
1645
  bool error= 0;
1646 1647
  DBUG_ENTER("dispatch_command");

1648 1649 1650
  if (thd->killed == THD::KILL_QUERY || thd->killed == THD::KILL_BAD_DATA)
    thd->killed= THD::NOT_KILLED;

1651
  thd->command=command;
1652
  /*
1653 1654
    Commands which always take a long time are logged into
    the slow log only if opt_log_slow_admin_statements is set.
1655
  */
1656
  thd->enable_slow_log= TRUE;
1657
  thd->lex->sql_command= SQLCOM_END; /* to avoid confusing VIEW detectors */
1658
  thd->set_time();
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1659 1660 1661
  VOID(pthread_mutex_lock(&LOCK_thread_count));
  thd->query_id=query_id;
  if (command != COM_STATISTICS && command != COM_PING)
1662
    next_query_id();
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1663
  thread_running++;
1664
  /* TODO: set thd->lex->sql_command to SQLCOM_END here */
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1665
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
1666

1667 1668
  thd->server_status&=
           ~(SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED);
1669
  switch (command) {
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1670
  case COM_INIT_DB:
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1671 1672
  {
    LEX_STRING tmp;
1673 1674
    statistic_increment(thd->status_var.com_stat[SQLCOM_CHANGE_DB],
			&LOCK_status);
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1675 1676
    thd->convert_string(&tmp, system_charset_info,
			packet, strlen(packet), thd->charset());
1677 1678
    if (!mysql_change_db(thd, tmp.str, FALSE))
    {
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1679
      general_log_print(thd, command, "%s",thd->db);
1680 1681
      send_ok(thd);
    }
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1682 1683
    break;
  }
1684
#ifdef HAVE_REPLICATION
1685 1686
  case COM_REGISTER_SLAVE:
  {
1687
    if (!register_slave(thd, (uchar*)packet, packet_length))
1688
      send_ok(thd);
1689 1690
    break;
  }
1691
#endif
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1692
  case COM_TABLE_DUMP:
1693 1694 1695
  {
    char *db, *tbl_name;
    uint db_len= *(uchar*) packet;
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1696
    if (db_len >= packet_length || db_len > NAME_LEN)
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1697
    {
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1698
      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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1699 1700
      break;
    }
1701
    uint tbl_len= *(uchar*) (packet + db_len + 1);
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1702 1703
    if (db_len+tbl_len+2 > packet_length || tbl_len > NAME_LEN)
    {
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1704
      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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1705 1706
      break;
    }
1707

1708
    statistic_increment(thd->status_var.com_other, &LOCK_status);
1709
    thd->enable_slow_log= opt_log_slow_admin_statements;
1710
    db= thd->alloc(db_len + tbl_len + 2);
1711 1712 1713 1714 1715
    if (!db)
    {
      my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
      break;
    }
1716 1717
    tbl_name= strmake(db, packet + 1, db_len)+1;
    strmake(tbl_name, packet + db_len + 2, tbl_len);
1718
    mysql_table_dump(thd, db, tbl_name);
1719 1720
    break;
  }
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1721 1722
  case COM_CHANGE_USER:
  {
1723
    thd->change_user();
1724
    thd->clear_error();                         // if errors from rollback
1725

1726
    statistic_increment(thd->status_var.com_other, &LOCK_status);
1727
    char *user= (char*) packet;
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1728
    char *passwd= strend(user)+1;
1729
    /*
1730 1731 1732 1733
      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).
    */
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1734
    char db_buff[NAME_LEN+1];               // buffer to store db in utf8
1735
    char *db= passwd;
1736
    uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ?
1737 1738
      *passwd++ : strlen(passwd);
    db+= passwd_len + 1;
1739
#ifndef EMBEDDED_LIBRARY
1740
    /* Small check for incoming packet */
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1741
    if ((uint) ((uchar*) db - net->read_pos) > packet_length)
1742
    {
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1743
      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
1744 1745
      break;
    }
1746
#endif
1747
    /* Convert database name to utf8 */
1748
    uint dummy_errors;
1749 1750
    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
                             system_charset_info, db, strlen(db),
1751
                             thd->charset(), &dummy_errors)]= 0;
1752
    db= db_buff;
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1753

1754 1755 1756
    /* Save user and privileges */
    uint save_db_length= thd->db_length;
    char *save_db= thd->db;
1757
    Security_context save_security_ctx= *thd->security_ctx;
1758
    USER_CONN *save_user_connect= thd->user_connect;
1759 1760

    if (!(thd->security_ctx->user= my_strdup(user, MYF(0))))
1761
    {
1762
      thd->security_ctx->user= save_security_ctx.user;
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1763
      my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
1764 1765
      break;
    }
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1766

1767 1768
    /* Clear variables that are allocated */
    thd->user_connect= 0;
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1769
    int res= check_user(thd, COM_CHANGE_USER, passwd, passwd_len, db, FALSE);
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1770

1771 1772
    if (res)
    {
1773
      /* authentication failure, we shall restore old user */
1774
      if (res > 0)
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1775
        my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
1776 1777
      x_free(thd->security_ctx->user);
      *thd->security_ctx= save_security_ctx;
1778
      thd->user_connect= save_user_connect;
1779 1780 1781 1782 1783
      thd->db= save_db;
      thd->db_length= save_db_length;
    }
    else
    {
1784
#ifndef NO_EMBEDDED_ACCESS_CHECKS
1785
      /* we've authenticated new user */
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1786 1787
      if (save_user_connect)
	decrease_user_connections(save_user_connect);
1788
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
1789
      x_free((gptr) save_db);
1790
      x_free((gptr)  save_security_ctx.user);
1791
    }
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1792 1793
    break;
  }
1794
  case COM_STMT_EXECUTE:
1795
  {
1796
    mysql_stmt_execute(thd, packet, packet_length);
1797 1798
    break;
  }
1799
  case COM_STMT_FETCH:
1800 1801 1802 1803
  {
    mysql_stmt_fetch(thd, packet, packet_length);
    break;
  }
1804
  case COM_STMT_SEND_LONG_DATA:
1805
  {
1806
    mysql_stmt_get_longdata(thd, packet, packet_length);
1807 1808
    break;
  }
1809
  case COM_STMT_PREPARE:
1810
  {
1811
    mysql_stmt_prepare(thd, packet, packet_length);
1812 1813
    break;
  }
1814
  case COM_STMT_CLOSE:
1815
  {
1816
    mysql_stmt_close(thd, packet);
1817 1818
    break;
  }
1819
  case COM_STMT_RESET:
1820 1821 1822 1823
  {
    mysql_stmt_reset(thd, packet);
    break;
  }
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1824 1825
  case COM_QUERY:
  {
1826 1827
    if (alloc_query(thd, packet, packet_length))
      break;					// fatal error is set
1828
    char *packet_end= thd->query + thd->query_length;
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1829
    general_log_print(thd, command, "%.*b", thd->query_length, thd->query);
1830
    DBUG_PRINT("query",("%-.4096s",thd->query));
1831 1832 1833 1834

    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),QUERY_PRIOR);

1835
    mysql_parse(thd,thd->query, thd->query_length);
1836

1837
    while (!thd->killed && thd->lex->found_semicolon && !thd->net.report_error)
1838
    {
1839
      char *packet= thd->lex->found_semicolon;
1840
      net->no_send_error= 0;
1841
      /*
1842 1843
        Multiple queries exits, execute them individually
      */
1844 1845
      if (thd->lock || thd->open_tables || thd->derived_tables ||
          thd->prelocked_mode)
1846
        close_thread_tables(thd);
1847
      ulong length= (ulong)(packet_end-packet);
1848

1849
      log_slow_statement(thd);
1850

1851
      /* Remove garbage at start of query */
1852
      while (my_isspace(thd->charset(), *packet) && length > 0)
1853 1854 1855 1856
      {
        packet++;
        length--;
      }
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1857
      VOID(pthread_mutex_lock(&LOCK_thread_count));
1858
      thd->query_length= length;
1859
      thd->query= packet;
1860
      thd->query_id= next_query_id();
1861
      thd->set_time(); /* Reset the query start time. */
1862
      /* TODO: set thd->lex->sql_command to SQLCOM_END here */
1863
      VOID(pthread_mutex_unlock(&LOCK_thread_count));
1864 1865 1866
      mysql_parse(thd, packet, length);
    }

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1867 1868 1869 1870 1871
    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),WAIT_PRIOR);
    DBUG_PRINT("info",("query ready"));
    break;
  }
1872
  case COM_FIELD_LIST:				// This isn't actually needed
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1873
#ifdef DONT_ALLOW_SHOW_COMMANDS
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1874 1875
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0));	/* purecov: inspected */
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1876 1877 1878
    break;
#else
  {
1879
    char *fields, *pend;
1880 1881
    /* Locked closure of all tables */
    TABLE_LIST *locked_tables= NULL;
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1882
    TABLE_LIST table_list;
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1883
    LEX_STRING conv_name;
1884
    /* Saved variable value */
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1885 1886 1887
    my_bool old_innodb_table_locks=  thd->variables.innodb_table_locks;


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1888 1889
    /* used as fields initializator */
    lex_start(thd, 0, 0);
1890

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1891

1892 1893
    statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_FIELDS],
			&LOCK_status);
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1894
    bzero((char*) &table_list,sizeof(table_list));
1895
    if (thd->copy_db_to(&table_list.db, 0))
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1896
      break;
1897
    pend= strend(packet);
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1898 1899
    thd->convert_string(&conv_name, system_charset_info,
			packet, (uint) (pend-packet), thd->charset());
1900
    table_list.alias= table_list.table_name= conv_name.str;
1901
    packet= pend+1;
1902 1903 1904 1905 1906 1907 1908 1909 1910

    if (!my_strcasecmp(system_charset_info, table_list.db,
                       information_schema_name.str))
    {
      ST_SCHEMA_TABLE *schema_table= find_schema_table(thd, table_list.alias);
      if (schema_table)
        table_list.schema_table= schema_table;
    }

1911
    thd->query_length= strlen(packet);       // for simplicity: don't optimize
1912 1913
    if (!(thd->query=fields=thd->memdup(packet,thd->query_length+1)))
      break;
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1914
    general_log_print(thd, command, "%s %s", table_list.table_name, fields);
1915
    if (lower_case_table_names)
1916
      my_casedn_str(files_charset_info, table_list.table_name);
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1917

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1918
    if (check_access(thd,SELECT_ACL,table_list.db,&table_list.grant.privilege,
1919
		     0, 0, test(table_list.schema_table)))
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1920
      break;
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1921 1922
    if (grant_option &&
	check_grant(thd, SELECT_ACL, &table_list, 2, UINT_MAX, 0))
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1923
      break;
1924 1925 1926 1927 1928 1929
    /* init structures for VIEW processing */
    table_list.select_lex= &(thd->lex->select_lex);
    mysql_init_query(thd, (uchar*)"", 0);
    thd->lex->
      select_lex.table_list.link_in_list((byte*) &table_list,
                                         (byte**) &table_list.next_local);
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1930
    thd->lex->add_to_query_tables(&table_list);
1931

1932 1933
    /* switch on VIEW optimisation: do not fill temporary tables */
    thd->lex->sql_command= SQLCOM_SHOW_FIELDS;
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1934
    mysqld_list_fields(thd,&table_list,fields);
1935
    thd->lex->unit.cleanup();
1936
    thd->cleanup_after_query();
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1937 1938 1939 1940
    break;
  }
#endif
  case COM_QUIT:
1941
    /* We don't calculate statistics for this command */
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1942
    general_log_print(thd, command, NullS);
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1943 1944 1945 1946
    net->error=0;				// Don't give 'abort' message
    error=TRUE;					// End server
    break;

1947
  case COM_CREATE_DB:				// QQ: To be removed
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1948
    {
1949
      char *db=thd->strdup(packet), *alias;
1950
      HA_CREATE_INFO create_info;
1951

1952 1953
      statistic_increment(thd->status_var.com_stat[SQLCOM_CREATE_DB],
			  &LOCK_status);
1954
      // null test to handle EOM
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1955
      if (!db || !(alias= thd->strdup(db)) || check_db_name(db))
1956
      {
1957
	my_error(ER_WRONG_DB_NAME, MYF(0), db ? db : "NULL");
1958 1959
	break;
      }
1960
      if (check_access(thd,CREATE_ACL,db,0,1,0,is_schema_db(db)))
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1961
	break;
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1962
      general_log_print(thd, command, packet);
1963
      bzero(&create_info, sizeof(create_info));
1964 1965
      mysql_create_db(thd, (lower_case_table_names == 2 ? alias : db),
                      &create_info, 0);
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1966 1967
      break;
    }
1968
  case COM_DROP_DB:				// QQ: To be removed
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1969
    {
1970 1971
      statistic_increment(thd->status_var.com_stat[SQLCOM_DROP_DB],
			  &LOCK_status);
1972
      char *db=thd->strdup(packet);
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1973
      /*  null test to handle EOM */
1974
      if (!db || check_db_name(db))
1975
      {
1976
	my_error(ER_WRONG_DB_NAME, MYF(0), db ? db : "NULL");
1977 1978
	break;
      }
1979
      if (check_access(thd,DROP_ACL,db,0,1,0,is_schema_db(db)))
1980
	break;
1981 1982
      if (thd->locked_tables || thd->active_transaction())
      {
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1983 1984
	my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                   ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
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1985
	break;
1986
      }
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1987
      general_log_print(thd, command, db);
1988
      mysql_rm_db(thd, db, 0, 0);
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1989 1990
      break;
    }
1991
#ifndef EMBEDDED_LIBRARY
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1992 1993
  case COM_BINLOG_DUMP:
    {
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1994 1995 1996 1997
      ulong pos;
      ushort flags;
      uint32 slave_server_id;

1998
      statistic_increment(thd->status_var.com_other,&LOCK_status);
1999
      thd->enable_slow_log= opt_log_slow_admin_statements;
2000
      if (check_global_access(thd, REPL_SLAVE_ACL))
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2001
	break;
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2002

2003
      /* TODO: The following has to be changed to an 8 byte integer */
2004 2005
      pos = uint4korr(packet);
      flags = uint2korr(packet + 4);
2006
      thd->server_id=0; /* avoid suicide */
2007
      if ((slave_server_id= uint4korr(packet+6))) // mysqlbinlog.server_id==0
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2008
	kill_zombie_dump_threads(slave_server_id);
2009
      thd->server_id = slave_server_id;
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2010

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2011
      general_log_print(thd, command, "Log: '%s'  Pos: %ld", packet+10,
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2012
                      (long) pos);
2013
      mysql_binlog_send(thd, thd->strdup(packet + 10), (my_off_t) pos, flags);
2014
      unregister_slave(thd,1,1);
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2015
      /*  fake COM_QUIT -- if we get here, the thread needs to terminate */
2016 2017
      error = TRUE;
      net->error = 0;
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2018 2019
      break;
    }
2020
#endif
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2021
  case COM_REFRESH:
2022 2023 2024 2025 2026 2027
  {
    bool not_used;
    statistic_increment(thd->status_var.com_stat[SQLCOM_FLUSH],
                        &LOCK_status);
    ulong options= (ulong) (uchar) packet[0];
    if (check_global_access(thd,RELOAD_ACL))
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2028
      break;
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2029
    general_log_print(thd, command, NullS);
2030 2031 2032 2033
    if (!reload_acl_and_cache(thd, options, (TABLE_LIST*) 0, &not_used))
      send_ok(thd);
    break;
  }
2034
#ifndef EMBEDDED_LIBRARY
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2035
  case COM_SHUTDOWN:
2036
  {
2037
    statistic_increment(thd->status_var.com_other, &LOCK_status);
2038
    if (check_global_access(thd,SHUTDOWN_ACL))
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2039
      break; /* purecov: inspected */
2040
    /*
2041 2042 2043 2044
      If the client is < 4.1.3, it is going to send us no argument; then
      packet_length is 1, packet[0] is the end 0 of the packet. Note that
      SHUTDOWN_DEFAULT is 0. If client is >= 4.1.3, the shutdown level is in
      packet[0].
2045
    */
2046 2047
    enum mysql_enum_shutdown_level level=
      (enum mysql_enum_shutdown_level) (uchar) packet[0];
2048
    DBUG_PRINT("quit",("Got shutdown command for level %u", level));
2049 2050 2051 2052 2053 2054 2055
    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;
    }
2056
    DBUG_PRINT("quit",("Got shutdown command for level %u", level));
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2057
    general_log_print(thd, command, NullS);
2058
    send_eof(thd);
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2059 2060 2061
#ifdef __WIN__
    sleep(1);					// must wait after eof()
#endif
2062
    send_eof(thd);				// This is for 'quit request'
2063
    close_connection(thd, 0, 1);
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2064 2065 2066 2067
    close_thread_tables(thd);			// Free before kill
    kill_mysql();
    error=TRUE;
    break;
2068
  }
2069
#endif
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2070 2071
  case COM_STATISTICS:
  {
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2072
    general_log_print(thd, command, NullS);
2073 2074
    statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_STATUS],
			&LOCK_status);
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2075
#ifndef EMBEDDED_LIBRARY
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2076
    char buff[200];
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2077 2078 2079
#else
    char *buff= thd->net.last_error;
#endif
2080 2081 2082 2083

    STATUS_VAR current_global_status_var;
    calc_sum_of_all_status(&current_global_status_var);

2084
    ulong uptime = (ulong) (thd->start_time - start_time);
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2085
    sprintf((char*) buff,
2086
	    "Uptime: %lu  Threads: %d  Questions: %lu  Slow queries: %lu  Opens: %lu  Flush tables: %lu  Open tables: %u  Queries per second avg: %.3f",
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2087
	    uptime,
2088
	    (int) thread_count, (ulong) thd->query_id,
2089
	    current_global_status_var.long_query_count,
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2090 2091
	    current_global_status_var.opened_tables, refresh_version,
            cached_open_tables(),
2092 2093
	    (uptime ? (ulonglong2double(thd->query_id) / (double) uptime) :
	     (double) 0));
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2094
#ifdef SAFEMALLOC
2095
    if (sf_malloc_cur_memory)				// Using SAFEMALLOC
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2096
      sprintf(strend(buff), "  Memory in use: %ldK  Max memory used: %ldK",
2097 2098
	      (sf_malloc_cur_memory+1023L)/1024L,
	      (sf_malloc_max_memory+1023L)/1024L);
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2099 2100
#endif
#ifndef EMBEDDED_LIBRARY
2101
    VOID(my_net_write(net, buff,(uint) strlen(buff)));
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2102
    VOID(net_flush(net));
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2103
#endif
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2104 2105 2106
    break;
  }
  case COM_PING:
2107
    statistic_increment(thd->status_var.com_other, &LOCK_status);
2108
    send_ok(thd);				// Tell client we are alive
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2109 2110
    break;
  case COM_PROCESS_INFO:
2111 2112
    statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_PROCESSLIST],
			&LOCK_status);
2113 2114
    if (!thd->security_ctx->priv_user[0] &&
        check_global_access(thd, PROCESS_ACL))
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2115
      break;
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2116
    general_log_print(thd, command, NullS);
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2117
    mysqld_list_processes(thd,
2118 2119
			  thd->security_ctx->master_access & PROCESS_ACL ? 
			  NullS : thd->security_ctx->priv_user, 0);
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2120 2121 2122
    break;
  case COM_PROCESS_KILL:
  {
2123
    statistic_increment(thd->status_var.com_stat[SQLCOM_KILL], &LOCK_status);
2124
    ulong id=(ulong) uint4korr(packet);
2125
    sql_kill(thd,id,false);
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2126 2127
    break;
  }
2128 2129
  case COM_SET_OPTION:
  {
2130 2131
    statistic_increment(thd->status_var.com_stat[SQLCOM_SET_OPTION],
			&LOCK_status);
2132 2133 2134 2135
    enum_mysql_set_option command= (enum_mysql_set_option) uint2korr(packet);
    switch (command) {
    case MYSQL_OPTION_MULTI_STATEMENTS_ON:
      thd->client_capabilities|= CLIENT_MULTI_STATEMENTS;
2136
      send_eof(thd);
2137 2138 2139
      break;
    case MYSQL_OPTION_MULTI_STATEMENTS_OFF:
      thd->client_capabilities&= ~CLIENT_MULTI_STATEMENTS;
2140
      send_eof(thd);
2141 2142
      break;
    default:
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2143
      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
2144 2145 2146 2147
      break;
    }
    break;
  }
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2148
  case COM_DEBUG:
2149
    statistic_increment(thd->status_var.com_other, &LOCK_status);
2150
    if (check_global_access(thd, SUPER_ACL))
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2151
      break;					/* purecov: inspected */
2152
    mysql_print_status();
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2153
    general_log_print(thd, command, NullS);
2154
    send_eof(thd);
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2155 2156 2157 2158 2159
    break;
  case COM_SLEEP:
  case COM_CONNECT:				// Impossible here
  case COM_TIME:				// Impossible from client
  case COM_DELAYED_INSERT:
2160
  case COM_END:
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2161
  default:
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2162
    my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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2163 2164
    break;
  }
2165 2166
  if (thd->lock || thd->open_tables || thd->derived_tables ||
      thd->prelocked_mode)
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2167 2168 2169 2170
  {
    thd->proc_info="closing tables";
    close_thread_tables(thd);			/* Free tables */
  }
2171 2172 2173 2174 2175 2176 2177 2178 2179 2180
  /*
    assume handlers auto-commit (if some doesn't - transaction handling
    in MySQL should be redesigned to support it; it's a big change,
    and it's not worth it - better to commit explicitly only writing
    transactions, read-only ones should better take care of themselves.
    saves some work in 2pc too)
    see also sql_base.cc - close_thread_tables()
  */
  bzero(&thd->transaction.stmt, sizeof(thd->transaction.stmt));
  if (!thd->active_transaction())
2181
    thd->transaction.xid_state.xid.null();
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2182

2183 2184 2185
  /* report error issued during command execution */
  if (thd->killed_errno() && !thd->net.report_error)
    thd->send_kill_message();
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2186
  if (thd->net.report_error)
2187
    net_send_error(thd);
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2188

2189
  log_slow_statement(thd);
2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204

  thd->proc_info="cleaning up";
  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For process list
  thd->proc_info=0;
  thd->command=COM_SLEEP;
  thd->query=0;
  thd->query_length=0;
  thread_running--;
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
  thd->packet.shrink(thd->variables.net_buffer_length);	// Reclaim some memory
  free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
  DBUG_RETURN(error);
}


2205
void log_slow_statement(THD *thd)
2206
{
2207
  time_t start_of_query;
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2208
  DBUG_ENTER("log_slow_statement");
2209 2210 2211 2212 2213 2214 2215

  /*
    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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2216
    DBUG_VOID_RETURN;                           // Don't set time for sub stmt
2217 2218

  start_of_query= thd->start_time;
2219
  thd->end_time();				// Set start time
2220

2221 2222 2223 2224 2225
  /*
    Do not log administrative statements unless the appropriate option is
    set; do not log into slow log if reading from backup.
  */
  if (thd->enable_slow_log && !thd->user_time)
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2226
  {
2227 2228
    thd->proc_info="logging slow query";

2229 2230
    if ((ulong) (thd->start_time - thd->time_after_lock) >
	thd->variables.long_query_time ||
2231 2232
	((thd->server_status &
	  (SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED)) &&
2233
	 (specialflag & SPECIAL_LOG_QUERIES_NOT_USING_INDEXES)))
2234
    {
2235
      thd->status_var.long_query_count++;
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2236
      slow_log_print(thd, thd->query, thd->query_length, start_of_query);
2237
    }
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2238
  }
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2239
  DBUG_VOID_RETURN;
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2240 2241
}

2242

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/*
  Create a TABLE_LIST object for an INFORMATION_SCHEMA table.

  SYNOPSIS
    prepare_schema_table()
      thd              thread handle
      lex              current lex
      table_ident      table alias if it's used
      schema_table_idx the type of the INFORMATION_SCHEMA table to be
                       created

  DESCRIPTION
    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.

  NOTES
    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).

  RETURN VALUE
    0                 success
    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)
{
  DBUG_ENTER("prepare_schema_table");
  SELECT_LEX *sel= 0;
2276
  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
    if ((specialflag & SPECIAL_SKIP_SHOW_DB) &&
	check_global_access(thd, SHOW_DB_ACL))
      DBUG_RETURN(1);
    break;
#endif
  case SCH_TABLE_NAMES:
  case SCH_TABLES:
  case SCH_VIEWS:
2291
  case SCH_TRIGGERS:
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2292
  case SCH_EVENTS:
2293
#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
    {
2299 2300 2301
      char *db;
      if (lex->select_lex.db == NULL &&
          thd->copy_db_to(&lex->select_lex.db, 0))
2302
      {
2303
        DBUG_RETURN(1);
2304
      }
2305
      db= lex->select_lex.db;
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      if (check_db_name(db))
      {
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        my_error(ER_WRONG_DB_NAME, MYF(0), db);
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        DBUG_RETURN(1);
      }
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      if (check_access(thd, SELECT_ACL, db, &thd->col_access, 0, 0,
                       is_schema_db(db)))
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        DBUG_RETURN(1);			        /* purecov: inspected */
      if (!thd->col_access && check_grant_db(thd,db))
      {
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2316
	my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
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                 thd->security_ctx->priv_user, thd->security_ctx->priv_host,
                 db);
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	DBUG_RETURN(1);
      }
      break;
    }
#endif
  case SCH_COLUMNS:
  case SCH_STATISTICS:
#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
    if (table_ident)
    {
      TABLE_LIST **query_tables_last= lex->query_tables_last;
      sel= new SELECT_LEX();
2335 2336
      /* 'parent_lex' is used in init_query() so it must be before it. */
      sel->parent_lex= lex;
2337
      sel->init_query();
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2338
      if (!sel->add_table_to_list(thd, table_ident, 0, 0, TL_READ, 
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                                 (List<String> *) 0, (List<String> *) 0))
        DBUG_RETURN(1);
      lex->query_tables_last= query_tables_last;
      TABLE_LIST *table_list= (TABLE_LIST*) sel->table_list.first;
      char *db= table_list->db;
      if (check_access(thd,SELECT_ACL | EXTRA_ACL,db,
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                       &table_list->grant.privilege, 0, 0,
                       test(table_list->schema_table)))
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        DBUG_RETURN(1);				/* purecov: inspected */
      if (grant_option && check_grant(thd, SELECT_ACL, table_list, 2,
                                      UINT_MAX, 0))
        DBUG_RETURN(1);
      break;
    }
#endif
2354 2355 2356
  case SCH_OPEN_TABLES:
  case SCH_VARIABLES:
  case SCH_STATUS:
2357 2358
  case SCH_PROCEDURES:
  case SCH_CHARSETS:
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2359
  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;
  table_list->schema_select_lex= sel;
2379
  table_list->schema_table_reformed= 1;
2380 2381 2382 2383
  DBUG_RETURN(0);
}


2384 2385
/*
  Read query from packet and store in thd->query
2386
  Used in COM_QUERY and COM_STMT_PREPARE
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  DESCRIPTION
    Sets the following THD variables:
      query
      query_length

  RETURN VALUES
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    FALSE ok
    TRUE  error;  In this case thd->fatal_error is set
2396 2397
*/

2398
bool alloc_query(THD *thd, const char *packet, uint packet_length)
2399 2400
{
  packet_length--;				// Remove end null
2401
  /* Remove garbage at start and end of query */
2402
  while (my_isspace(thd->charset(),packet[0]) && packet_length > 0)
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  {
    packet++;
    packet_length--;
  }
2407
  const char *pos= packet + packet_length;     // Point at end null
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2408
  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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  thd->query_length= 0;                        // Extra safety: Avoid races
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  if (!(thd->query= (char*) thd->memdup_w_gap((gptr) (packet),
					      packet_length,
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					      thd->db_length+ 1 +
					      QUERY_CACHE_FLAGS_SIZE)))
2420
    return TRUE;
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  thd->query[packet_length]=0;
  thd->query_length= 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);
2427

2428
  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;
  thd->one_shot_set= 0;
}

2447

2448
/*
2449
  Execute command saved in thd and lex->sql_command
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  SYNOPSIS
    mysql_execute_command()
      thd                       Thread handle

  IMPLEMENTATION

    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.

  RETURN
    FALSE       OK
    TRUE        Error
*/
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2471

2472
bool
2473
mysql_execute_command(THD *thd)
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2474
{
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  bool res= FALSE;
  bool need_start_waiting= FALSE; // have protection against global read lock
  int  result= 0;
  LEX  *lex= thd->lex;
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2479
  /* first SELECT_LEX (have special meaning for many of non-SELECTcommands) */
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2480
  SELECT_LEX *select_lex= &lex->select_lex;
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2481
  /* first table of first SELECT_LEX */
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2482
  TABLE_LIST *first_table= (TABLE_LIST*) select_lex->table_list.first;
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  /* list of all tables in query */
  TABLE_LIST *all_tables;
  /* most outer SELECT_LEX_UNIT of query */
2486
  SELECT_LEX_UNIT *unit= &lex->unit;
2487
  /* Saved variable value */
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2488
  DBUG_ENTER("mysql_execute_command");
2489
  thd->net.no_send_error= 0;
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#ifdef WITH_PARTITION_STORAGE_ENGINE
  thd->work_part_info= 0;
#endif
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2493

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VIEW  
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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();
2510
  /* should be assigned after making first tables same */
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2511
  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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  /*
    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.
2522
    Don't reset warnings when executing a stored routine.
2523
  */
2524
  if ((all_tables || &lex->select_lex != lex->all_selects_list ||
2525
       lex->sroutines.records) && !thd->spcont ||
2526
      lex->time_zone_tables_used)
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2527
    mysql_reset_errors(thd, 0);
2528

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SCRUM  
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2529
#ifdef HAVE_REPLICATION
2530
  if (unlikely(thd->slave_thread))
2531
  {
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2532
    /*
2533 2534
      Check if statment should be skipped because of slave filtering
      rules
2535 2536

      Exceptions are:
2537 2538
      - UPDATE MULTI: For this statement, we want to check the filtering
        rules later in the code
2539
      - SET: we always execute it (Not that many SET commands exists in
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2540 2541
        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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2544
    */
2545 2546
    if (!(lex->sql_command == SQLCOM_UPDATE_MULTI) &&
	!(lex->sql_command == SQLCOM_SET_OPTION) &&
2547
	!(lex->sql_command == SQLCOM_DROP_TABLE &&
2548
          lex->drop_temporary && lex->drop_if_exists) &&
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2549
        all_tables_not_ok(thd, all_tables))
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2550 2551
    {
      /* we warn the slave SQL thread */
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2552
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
2553
      reset_one_shot_variables(thd);
2554
      DBUG_RETURN(0);
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2555
    }
2556
  }
2557
  else
2558
  {
2559
#endif /* HAVE_REPLICATION */
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    /*
      When option readonly is set deny operations which change non-temporary
      tables. Except for the replication thread and the 'super' users.
    */
    if (opt_readonly &&
	!(thd->security_ctx->master_access & SUPER_ACL) &&
2566
	(sql_command_flags[lex->sql_command] & CF_CHANGES_DATA) &&
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	!((lex->sql_command == SQLCOM_CREATE_TABLE) &&
	  (lex->create_info.options & HA_LEX_CREATE_TMP_TABLE)) &&
	((lex->sql_command != SQLCOM_UPDATE_MULTI) &&
	 some_non_temp_table_to_be_updated(thd, all_tables)))
    {
      my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
      DBUG_RETURN(-1);
    }
#ifdef HAVE_REPLICATION
  } /* endif unlikely slave */
#endif
2578 2579
  statistic_increment(thd->status_var.com_stat[lex->sql_command],
                      &LOCK_status);
2580

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2581
  switch (lex->sql_command) {
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  case SQLCOM_SHOW_EVENTS:
    if ((res= check_access(thd, EVENT_ACL, thd->lex->select_lex.db, 0, 0, 0,
                           is_schema_db(thd->lex->select_lex.db))))
      break;
    /* fall through */
  case SQLCOM_SHOW_STATUS_PROC:
  case SQLCOM_SHOW_STATUS_FUNC:
    res= execute_sqlcom_select(thd, all_tables);
    break;
  case SQLCOM_SHOW_STATUS:
  {
    system_status_var old_status_var= thd->status_var;
    thd->initial_status_var= &old_status_var;
    res= execute_sqlcom_select(thd, all_tables);
    /* 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
    */
    pthread_mutex_lock(&LOCK_status);
    add_diff_to_status(&global_status_var, &thd->status_var,
                       &old_status_var);
    thd->status_var= old_status_var;
    pthread_mutex_unlock(&LOCK_status);
    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:
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2621
  case SQLCOM_SELECT:
2622
    thd->status_var.last_query_cost= 0.0;
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2623
    if (all_tables)
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2624
    {
2625 2626 2627 2628
      res= check_table_access(thd,
                              lex->exchange ? SELECT_ACL | FILE_ACL :
                              SELECT_ACL,
                              all_tables, 0);
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2629 2630
    }
    else
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2631
      res= check_access(thd,
2632 2633 2634 2635
                        lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL,
                        any_db, 0, 0, 0, 0);
    if (!res)
      res= execute_sqlcom_select(thd, all_tables);
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2636
    break;
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2637
  case SQLCOM_PREPARE:
2638
  {
2639
    mysql_sql_stmt_prepare(thd);
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2640 2641 2642 2643
    break;
  }
  case SQLCOM_EXECUTE:
  {
2644
    mysql_sql_stmt_execute(thd);
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2645 2646 2647 2648
    break;
  }
  case SQLCOM_DEALLOCATE_PREPARE:
  {
2649
    mysql_sql_stmt_close(thd);
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2650 2651
    break;
  }
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2652
  case SQLCOM_DO:
2653 2654
    if (check_table_access(thd, SELECT_ACL, all_tables, 0) ||
        open_and_lock_tables(thd, all_tables))
2655
      goto error;
2656 2657

    res= mysql_do(thd, *lex->insert_list);
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2658 2659
    break;

2660
  case SQLCOM_EMPTY_QUERY:
2661
    send_ok(thd);
2662 2663
    break;

2664 2665 2666 2667
  case SQLCOM_HELP:
    res= mysqld_help(thd,lex->help_arg);
    break;

2668
#ifndef EMBEDDED_LIBRARY
2669
  case SQLCOM_PURGE:
2670
  {
2671
    if (check_global_access(thd, SUPER_ACL))
2672
      goto error;
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2673
    /* PURGE MASTER LOGS TO 'file' */
2674 2675 2676
    res = purge_master_logs(thd, lex->to_log);
    break;
  }
2677 2678
  case SQLCOM_PURGE_BEFORE:
  {
2679 2680
    Item *it;

2681 2682
    if (check_global_access(thd, SUPER_ACL))
      goto error;
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2683
    /* PURGE MASTER LOGS BEFORE 'data' */
2684
    it= (Item *)lex->value_list.head();
2685
    if ((!it->fixed && it->fix_fields(lex->thd, &it)) ||
2686
        it->check_cols(1))
2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697
    {
      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());
2698 2699
    break;
  }
2700
#endif
2701 2702
  case SQLCOM_SHOW_WARNS:
  {
2703 2704
    res= mysqld_show_warnings(thd, (ulong)
			      ((1L << (uint) MYSQL_ERROR::WARN_LEVEL_NOTE) |
2705 2706 2707
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_WARN) |
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR)
			       ));
2708 2709 2710 2711
    break;
  }
  case SQLCOM_SHOW_ERRORS:
  {
2712 2713
    res= mysqld_show_warnings(thd, (ulong)
			      (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR));
2714 2715
    break;
  }
2716 2717
  case SQLCOM_SHOW_NEW_MASTER:
  {
2718
    if (check_global_access(thd, REPL_SLAVE_ACL))
2719
      goto error;
2720
    /* This query don't work now. See comment in repl_failsafe.cc */
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2721
#ifndef WORKING_NEW_MASTER
2722 2723
    my_error(ER_NOT_SUPPORTED_YET, MYF(0), "SHOW NEW MASTER");
    goto error;
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2724
#else
2725 2726
    res = show_new_master(thd);
    break;
2727
#endif
2728
  }
2729

2730
#ifdef HAVE_REPLICATION
2731 2732
  case SQLCOM_SHOW_SLAVE_HOSTS:
  {
2733
    if (check_global_access(thd, REPL_SLAVE_ACL))
2734 2735 2736 2737
      goto error;
    res = show_slave_hosts(thd);
    break;
  }
2738 2739
  case SQLCOM_SHOW_BINLOG_EVENTS:
  {
2740
    if (check_global_access(thd, REPL_SLAVE_ACL))
2741
      goto error;
2742
    res = mysql_show_binlog_events(thd);
2743 2744
    break;
  }
2745 2746
#endif

2747
  case SQLCOM_BACKUP_TABLE:
2748
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2749
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2750
    if (check_table_access(thd, SELECT_ACL, all_tables, 0) ||
2751
	check_global_access(thd, FILE_ACL))
2752
      goto error; /* purecov: inspected */
2753
    thd->enable_slow_log= opt_log_slow_admin_statements;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2754
    res = mysql_backup_table(thd, first_table);
2755
    select_lex->table_list.first= (byte*) first_table;
2756
    lex->query_tables=all_tables;
2757 2758
    break;
  }
2759
  case SQLCOM_RESTORE_TABLE:
2760
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2761
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2762
    if (check_table_access(thd, INSERT_ACL, all_tables, 0) ||
2763
	check_global_access(thd, FILE_ACL))
2764
      goto error; /* purecov: inspected */
2765
    thd->enable_slow_log= opt_log_slow_admin_statements;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2766
    res = mysql_restore_table(thd, first_table);
2767
    select_lex->table_list.first= (byte*) first_table;
2768
    lex->query_tables=all_tables;
2769 2770
    break;
  }
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2771 2772
  case SQLCOM_ASSIGN_TO_KEYCACHE:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2773
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2774
    if (check_access(thd, INDEX_ACL, first_table->db,
2775 2776
                     &first_table->grant.privilege, 0, 0,
                     test(first_table->schema_table)))
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2777
      goto error;
2778
    res= mysql_assign_to_keycache(thd, first_table, &lex->ident);
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2779 2780
    break;
  }
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2781 2782
  case SQLCOM_PRELOAD_KEYS:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2783
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2784
    if (check_access(thd, INDEX_ACL, first_table->db,
2785 2786
                     &first_table->grant.privilege, 0, 0,
                     test(first_table->schema_table)))
2787
      goto error;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2788
    res = mysql_preload_keys(thd, first_table);
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2789 2790
    break;
  }
2791
#ifdef HAVE_REPLICATION
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2792
  case SQLCOM_CHANGE_MASTER:
2793
  {
2794
    if (check_global_access(thd, SUPER_ACL))
2795
      goto error;
2796
    pthread_mutex_lock(&LOCK_active_mi);
2797
    res = change_master(thd,active_mi);
2798
    pthread_mutex_unlock(&LOCK_active_mi);
2799 2800
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2801
  case SQLCOM_SHOW_SLAVE_STAT:
2802
  {
2803 2804
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2805
      goto error;
2806
    pthread_mutex_lock(&LOCK_active_mi);
2807
    res = show_master_info(thd,active_mi);
2808
    pthread_mutex_unlock(&LOCK_active_mi);
2809 2810
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2811
  case SQLCOM_SHOW_MASTER_STAT:
2812
  {
2813 2814
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2815 2816 2817 2818
      goto error;
    res = show_binlog_info(thd);
    break;
  }
peter@mysql.com's avatar
peter@mysql.com committed
2819

2820
  case SQLCOM_LOAD_MASTER_DATA: // sync with master
2821
    if (check_global_access(thd, SUPER_ACL))
2822
      goto error;
2823
    if (end_active_trans(thd))
2824
      goto error;
2825
    res = load_master_data(thd);
2826
    break;
2827
#endif /* HAVE_REPLICATION */
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
2828
  case SQLCOM_SHOW_ENGINE_STATUS:
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2829
    {
2830
      if (check_global_access(thd, SUPER_ACL))
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
2831 2832
        goto error;
      res = ha_show_status(thd, lex->create_info.db_type, HA_ENGINE_STATUS);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2833 2834
      break;
    }
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
2835
  case SQLCOM_SHOW_ENGINE_MUTEX:
vtkachenko@intelp4d.mysql.com's avatar
vtkachenko@intelp4d.mysql.com committed
2836 2837
    {
      if (check_global_access(thd, SUPER_ACL))
vtkachenko@intelp4d.mysql.com's avatar
vtkachenko@intelp4d.mysql.com committed
2838
        goto error;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
2839
      res = ha_show_status(thd, lex->create_info.db_type, HA_ENGINE_MUTEX);
vtkachenko@intelp4d.mysql.com's avatar
vtkachenko@intelp4d.mysql.com committed
2840 2841
      break;
    }
2842
#ifdef HAVE_REPLICATION
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2843
  case SQLCOM_LOAD_MASTER_TABLE:
2844
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2845
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2846 2847
    DBUG_ASSERT(first_table->db); /* Must be set in the parser */

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2848
    if (check_access(thd, CREATE_ACL, first_table->db,
2849 2850
		     &first_table->grant.privilege, 0, 0,
                     test(first_table->schema_table)))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2851 2852 2853 2854
      goto error;				/* purecov: inspected */
    if (grant_option)
    {
      /* Check that the first table has CREATE privilege */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2855
      if (check_grant(thd, CREATE_ACL, all_tables, 0, 1, 0))
2856
	goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2857
    }
2858
    if (strlen(first_table->table_name) > NAME_LEN)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2859
    {
2860
      my_error(ER_WRONG_TABLE_NAME, MYF(0), first_table->table_name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2861 2862
      break;
    }
2863
    pthread_mutex_lock(&LOCK_active_mi);
2864 2865 2866 2867
    /*
      fetch_master_table will send the error to the client on failure.
      Give error if the table already exists.
    */
2868
    if (!fetch_master_table(thd, first_table->db, first_table->table_name,
2869
			    active_mi, 0, 0))
2870
    {
2871
      send_ok(thd);
2872
    }
2873
    pthread_mutex_unlock(&LOCK_active_mi);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2874
    break;
2875
  }
2876
#endif /* HAVE_REPLICATION */
2877

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2878
  case SQLCOM_CREATE_TABLE:
2879
  {
2880
    /* If CREATE TABLE of non-temporary table, do implicit commit */
2881 2882 2883 2884 2885 2886 2887 2888
    if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE))
    {
      if (end_active_trans(thd))
      {
	res= -1;
	break;
      }
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2889 2890 2891 2892 2893
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    bool link_to_local;
    // Skip first table, which is the table we are creating
    TABLE_LIST *create_table= lex->unlink_first_table(&link_to_local);
    TABLE_LIST *select_tables= lex->query_tables;
monty@mysql.com's avatar
monty@mysql.com committed
2894

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2895
    if ((res= create_table_precheck(thd, select_tables, create_table)))
monty@mysql.com's avatar
monty@mysql.com committed
2896
      goto end_with_restore_list;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2897

2898 2899 2900
#ifndef HAVE_READLINK
    lex->create_info.data_file_name=lex->create_info.index_file_name=0;
#else
2901
    /* Fix names if symlinked tables */
2902
    if (append_file_to_dir(thd, &lex->create_info.data_file_name,
2903
			   create_table->table_name) ||
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2904
	append_file_to_dir(thd, &lex->create_info.index_file_name,
2905
			   create_table->table_name))
monty@mysql.com's avatar
monty@mysql.com committed
2906
      goto end_with_restore_list;
2907
#endif
2908
    /*
2909
      If we are using SET CHARSET without DEFAULT, add an implicit
2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920
      DEFAULT to not confuse old users. (This may change).
    */
    if ((lex->create_info.used_fields & 
	 (HA_CREATE_USED_DEFAULT_CHARSET | HA_CREATE_USED_CHARSET)) ==
	HA_CREATE_USED_CHARSET)
    {
      lex->create_info.used_fields&= ~HA_CREATE_USED_CHARSET;
      lex->create_info.used_fields|= HA_CREATE_USED_DEFAULT_CHARSET;
      lex->create_info.default_table_charset= lex->create_info.table_charset;
      lex->create_info.table_charset= 0;
    }
2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933
    /*
      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
      created during a gobal read lock.
    */
2934 2935
    if (!thd->locked_tables &&
        !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
2936
    {
monty@mysql.com's avatar
monty@mysql.com committed
2937 2938
      res= 1;
      goto end_with_restore_list;
2939
    }
2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950
#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
2951
    if (select_lex->item_list.elements)		// With select
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2952 2953
    {
      select_result *result;
2954

2955
      select_lex->options|= SELECT_NO_UNLOCK;
2956
      unit->set_limit(select_lex);
2957

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2958
      if (!(res= open_and_lock_tables(thd, select_tables)))
2959
      {
2960 2961 2962 2963
        /*
          Is table which we are changing used somewhere in other parts
          of query
        */
2964
        if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE))
2965
        {
2966
          TABLE_LIST *duplicate;
2967
          if ((duplicate= unique_table(thd, create_table, select_tables)))
2968 2969 2970
          {
            update_non_unique_table_error(create_table, "CREATE", duplicate);
            res= 1;
2971
            goto end_with_restore_list;
2972
          }
2973
        }
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2974 2975 2976 2977 2978 2979 2980 2981
        /* If we create merge table, we have to test tables in merge, too */
        if (lex->create_info.used_fields & HA_CREATE_USED_UNION)
        {
          TABLE_LIST *tab;
          for (tab= (TABLE_LIST*) lex->create_info.merge_list.first;
               tab;
               tab= tab->next_local)
          {
2982
            TABLE_LIST *duplicate;
2983
            if ((duplicate= unique_table(thd, tab, select_tables)))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2984
            {
2985
              update_non_unique_table_error(tab, "CREATE", duplicate);
monty@mysql.com's avatar
monty@mysql.com committed
2986
              res= 1;
2987
              goto end_with_restore_list;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2988 2989 2990
            }
          }
        }
2991

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2992 2993 2994 2995 2996
        if ((result= new select_create(create_table,
				       &lex->create_info,
				       lex->create_list,
				       lex->key_list,
				       select_lex->item_list,
2997 2998
				       lex->duplicates,
				       lex->ignore)))
2999 3000 3001 3002 3003
        {
          /*
            CREATE from SELECT give its SELECT_LEX for SELECT,
            and item_list belong to SELECT
          */
3004
          res= handle_select(thd, lex, result, 0);
3005
          delete result;
3006
        }
monty@mysql.com's avatar
monty@mysql.com committed
3007
	/* reset for PS */
3008 3009
	lex->create_list.empty();
	lex->key_list.empty();
3010 3011
      }
    }
monty@mysql.com's avatar
monty@mysql.com committed
3012
    else
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3013
    {
3014 3015 3016
      /* So that CREATE TEMPORARY TABLE gets to binlog at commit/rollback */
      if (lex->create_info.options & HA_LEX_CREATE_TMP_TABLE)
        thd->options|= OPTION_KEEP_LOG;
monty@mysql.com's avatar
monty@mysql.com committed
3017
      /* regular create */
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3018
      if (lex->like_name)
monty@mysql.com's avatar
monty@mysql.com committed
3019
        res= mysql_create_like_table(thd, create_table, &lex->create_info, 
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3020
                                     lex->like_name); 
venu@myvenu.com's avatar
venu@myvenu.com committed
3021
      else
3022
      {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3023
        res= mysql_create_table(thd, create_table->db,
3024
				create_table->table_name, &lex->create_info,
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3025
				lex->create_list,
3026
				lex->key_list, 0, 0, 1);
3027
      }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3028
      if (!res)
3029
	send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3030
    }
3031

monty@mysql.com's avatar
monty@mysql.com committed
3032
    /* put tables back for PS rexecuting */
monty@mysql.com's avatar
monty@mysql.com committed
3033
end_with_restore_list:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3034
    lex->link_first_table_back(create_table, link_to_local);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3035
    break;
3036
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3037
  case SQLCOM_CREATE_INDEX:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3038 3039
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_one_table_access(thd, INDEX_ACL, all_tables))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3040
      goto error; /* purecov: inspected */
3041
    thd->enable_slow_log= opt_log_slow_admin_statements;
3042
    if (end_active_trans(thd))
3043
      goto error;
3044
    res= mysql_create_index(thd, first_table, lex->key_list);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3045 3046
    break;

3047
#ifdef HAVE_REPLICATION
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3048
  case SQLCOM_SLAVE_START:
3049
  {
3050
    pthread_mutex_lock(&LOCK_active_mi);
3051
    start_slave(thd,active_mi,1 /* net report*/);
3052
    pthread_mutex_unlock(&LOCK_active_mi);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3053
    break;
3054
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3055
  case SQLCOM_SLAVE_STOP:
3056 3057 3058 3059 3060 3061
  /*
    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,
3062
      so it waits for the client thread because t is locked by it.
3063
    - then the client thread does SLAVE STOP.
3064 3065
      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.
3066 3067 3068
    To prevent that, refuse SLAVE STOP if the
    client thread has locked tables
  */
3069
  if (thd->locked_tables || thd->active_transaction() || thd->global_read_lock)
3070
  {
3071 3072
    my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
               ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3073
    goto error;
3074
  }
3075
  {
3076
    pthread_mutex_lock(&LOCK_active_mi);
3077
    stop_slave(thd,active_mi,1/* net report*/);
3078
    pthread_mutex_unlock(&LOCK_active_mi);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3079
    break;
3080
  }
3081
#endif /* HAVE_REPLICATION */
3082

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3083
  case SQLCOM_ALTER_TABLE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3084
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3085
    {
3086
      ulong priv=0;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3087 3088 3089 3090 3091
      ulong priv_needed= ALTER_ACL;
      /* We also require DROP priv for ALTER TABLE ... DROP PARTITION */
      if (lex->alter_info.flags & ALTER_DROP_PARTITION)
        priv_needed|= DROP_ACL;

Sinisa@sinisa.nasamreza.org's avatar
Sinisa@sinisa.nasamreza.org committed
3092
      if (lex->name && (!lex->name[0] || strlen(lex->name) > NAME_LEN))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3093
      {
3094
	my_error(ER_WRONG_TABLE_NAME, MYF(0), lex->name);
3095
        goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3096
      }
3097 3098
      /* Must be set in the parser */
      DBUG_ASSERT(select_lex->db);
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3099
      if (check_access(thd, priv_needed, first_table->db,
3100 3101 3102 3103
		       &first_table->grant.privilege, 0, 0,
                       test(first_table->schema_table)) ||
	  check_access(thd,INSERT_ACL | CREATE_ACL,select_lex->db,&priv,0,0,
                       is_schema_db(select_lex->db))||
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3104
	  check_merge_table_access(thd, first_table->db,
3105 3106 3107
				   (TABLE_LIST *)
				   lex->create_info.merge_list.first))
	goto error;				/* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3108 3109
      if (grant_option)
      {
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3110
	if (check_grant(thd, priv_needed, all_tables, 0, UINT_MAX, 0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3111 3112 3113 3114 3115
	  goto error;
	if (lex->name && !test_all_bits(priv,INSERT_ACL | CREATE_ACL))
	{					// Rename of table
	  TABLE_LIST tmp_table;
	  bzero((char*) &tmp_table,sizeof(tmp_table));
3116
	  tmp_table.table_name=lex->name;
3117
	  tmp_table.db=select_lex->db;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3118
	  tmp_table.grant.privilege=priv;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3119 3120
	  if (check_grant(thd, INSERT_ACL | CREATE_ACL, &tmp_table, 0,
			  UINT_MAX, 0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3121 3122 3123
	    goto error;
	}
      }
3124
      /* Don't yet allow changing of symlinks with ALTER TABLE */
3125 3126 3127 3128 3129 3130
      if (lex->create_info.data_file_name)
        push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
                     "DATA DIRECTORY option ignored");
      if (lex->create_info.index_file_name)
        push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
                     "INDEX DIRECTORY option ignored");
3131
      lex->create_info.data_file_name=lex->create_info.index_file_name=0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3132
      /* ALTER TABLE ends previous transaction */
3133
      if (end_active_trans(thd))
3134
	goto error;
3135

3136 3137 3138 3139 3140
      if (!thd->locked_tables &&
          !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
      {
        res= 1;
        break;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3141
      }
3142

3143 3144 3145 3146 3147 3148 3149
      thd->enable_slow_log= opt_log_slow_admin_statements;
      res= mysql_alter_table(thd, select_lex->db, lex->name,
                             &lex->create_info,
                             first_table, lex->create_list,
                             lex->key_list,
                             select_lex->order_list.elements,
                             (ORDER *) select_lex->order_list.first,
3150
                             lex->ignore, &lex->alter_info, 1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3151 3152
      break;
    }
3153
  case SQLCOM_RENAME_TABLE:
3154
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3155
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3156
    TABLE_LIST *table;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3157
    for (table= first_table; table; table= table->next_local->next_local)
3158
    {
monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
3159
      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
3160
		       &table->grant.privilege,0,0, test(table->schema_table)) ||
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3161
	  check_access(thd, INSERT_ACL | CREATE_ACL, table->next_local->db,
3162 3163
		       &table->next_local->grant.privilege, 0, 0,
                       test(table->next_local->schema_table)))
3164 3165 3166
	goto error;
      if (grant_option)
      {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3167
	TABLE_LIST old_list, new_list;
3168 3169 3170 3171
	/*
	  we do not need initialize old_list and new_list because we will
	  come table[0] and table->next[0] there
	*/
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3172 3173 3174 3175
	old_list= table[0];
	new_list= table->next_local[0];
	if (check_grant(thd, ALTER_ACL, &old_list, 0, 1, 0) ||
	    (!test_all_bits(table->next_local->grant.privilege,
3176
			    INSERT_ACL | CREATE_ACL) &&
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3177
	     check_grant(thd, INSERT_ACL | CREATE_ACL, &new_list, 0, 1, 0)))
3178 3179 3180
	  goto error;
      }
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3181
    query_cache_invalidate3(thd, first_table, 0);
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3182
    if (end_active_trans(thd) || mysql_rename_tables(thd, first_table, 0))
3183
      goto error;
3184
    break;
3185
  }
3186
#ifndef EMBEDDED_LIBRARY
3187 3188
  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3189 3190
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
3191
    goto error;
3192 3193
#else
    {
3194
      if (check_global_access(thd, SUPER_ACL))
3195 3196 3197 3198
	goto error;
      res = show_binlogs(thd);
      break;
    }
peter@mysql.com's avatar
peter@mysql.com committed
3199
#endif
3200
#endif /* EMBEDDED_LIBRARY */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3201
  case SQLCOM_SHOW_CREATE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3202
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3203
#ifdef DONT_ALLOW_SHOW_COMMANDS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3204 3205
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
3206
    goto error;
3207
#else
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3208
    {
3209 3210 3211 3212
      /* Ignore temporary tables if this is "SHOW CREATE VIEW" */
      if (lex->only_view)
        first_table->skip_temporary= 1;

3213
      if (check_access(thd, SELECT_ACL | EXTRA_ACL, first_table->db,
3214 3215
		       &first_table->grant.privilege, 0, 0, 
                       test(first_table->schema_table)))
3216
	goto error;
monty@mishka.local's avatar
monty@mishka.local committed
3217
      if (grant_option && check_grant(thd, SELECT_ACL, all_tables, 2, UINT_MAX, 0))
3218
	goto error;
monty@mishka.local's avatar
monty@mishka.local committed
3219
      res= mysqld_show_create(thd, first_table);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3220 3221
      break;
    }
3222
#endif
3223 3224
  case SQLCOM_CHECKSUM:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3225
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3226
    if (check_table_access(thd, SELECT_ACL | EXTRA_ACL, all_tables, 0))
3227
      goto error; /* purecov: inspected */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3228
    res = mysql_checksum_table(thd, first_table, &lex->check_opt);
3229 3230
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3231
  case SQLCOM_REPAIR:
3232
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3233
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3234
    if (check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
3235
      goto error; /* purecov: inspected */
3236
    thd->enable_slow_log= opt_log_slow_admin_statements;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3237
    res= mysql_repair_table(thd, first_table, &lex->check_opt);
3238 3239 3240
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
3241
      /* Presumably, REPAIR and binlog writing doesn't require synchronization */
3242 3243
      if (mysql_bin_log.is_open())
      {
3244
	thd->clear_error(); // No binlog error generated
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3245 3246
        thd->binlog_query(THD::STMT_QUERY_TYPE,
                          thd->query, thd->query_length, 0, FALSE);
3247 3248
      }
    }
3249
    select_lex->table_list.first= (byte*) first_table;
3250
    lex->query_tables=all_tables;
3251 3252
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3253
  case SQLCOM_CHECK:
3254
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3255
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3256
    if (check_table_access(thd, SELECT_ACL | EXTRA_ACL , all_tables, 0))
3257
      goto error; /* purecov: inspected */
3258
    thd->enable_slow_log= opt_log_slow_admin_statements;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3259
    res = mysql_check_table(thd, first_table, &lex->check_opt);
3260
    select_lex->table_list.first= (byte*) first_table;
3261
    lex->query_tables=all_tables;
3262 3263
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3264 3265
  case SQLCOM_ANALYZE:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3266
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3267
    if (check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3268
      goto error; /* purecov: inspected */
3269
    thd->enable_slow_log= opt_log_slow_admin_statements;
3270
    res= mysql_analyze_table(thd, first_table, &lex->check_opt);
3271 3272 3273
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
3274
      /* Presumably, ANALYZE and binlog writing doesn't require synchronization */
3275 3276
      if (mysql_bin_log.is_open())
      {
3277
	thd->clear_error(); // No binlog error generated
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3278 3279
        thd->binlog_query(THD::STMT_QUERY_TYPE,
                          thd->query, thd->query_length, 0, FALSE);
3280 3281
      }
    }
3282
    select_lex->table_list.first= (byte*) first_table;
3283
    lex->query_tables=all_tables;
3284
    break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3285
  }
3286

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3287 3288
  case SQLCOM_OPTIMIZE:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3289
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3290
    if (check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3291
      goto error; /* purecov: inspected */
3292
    thd->enable_slow_log= opt_log_slow_admin_statements;
3293
    res= (specialflag & (SPECIAL_SAFE_MODE | SPECIAL_NO_NEW_FUNC)) ?
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3294 3295
      mysql_recreate_table(thd, first_table, 1) :
      mysql_optimize_table(thd, first_table, &lex->check_opt);
3296 3297 3298
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
3299
      /* Presumably, OPTIMIZE and binlog writing doesn't require synchronization */
3300 3301
      if (mysql_bin_log.is_open())
      {
3302
	thd->clear_error(); // No binlog error generated
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3303 3304
        thd->binlog_query(THD::STMT_QUERY_TYPE,
                          thd->query, thd->query_length, 0, FALSE);
3305 3306
      }
    }
3307
    select_lex->table_list.first= (byte*) first_table;
3308
    lex->query_tables=all_tables;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3309 3310 3311
    break;
  }
  case SQLCOM_UPDATE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3312 3313
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (update_precheck(thd, all_tables))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3314
      break;
3315 3316
    DBUG_ASSERT(select_lex->offset_limit == 0);
    unit->set_limit(select_lex);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3317 3318 3319 3320 3321 3322
    res= (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,
3323
                               unit->select_limit_cnt,
3324
                               lex->duplicates, lex->ignore));
3325
    /* mysql_update return 2 if we need to switch to multi-update */
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3326
    if (result != 2)
3327
      break;
3328
  case SQLCOM_UPDATE_MULTI:
3329 3330 3331 3332
  {
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    /* if we switched from normal update, rights are checked */
    if (result != 2)
3333
    {
3334 3335 3336 3337 3338
      if ((res= multi_update_precheck(thd, all_tables)))
        break;
    }
    else
      res= 0;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3339

3340
    res= mysql_multi_update_prepare(thd);
3341

3342
#ifdef HAVE_REPLICATION
3343
    /* Check slave filtering rules */
3344
    if (unlikely(thd->slave_thread))
3345
    {
3346 3347
      if (all_tables_not_ok(thd, all_tables))
      {
3348 3349 3350 3351 3352
        if (res!= 0)
        {
          res= 0;             /* don't care of prev failure  */
          thd->clear_error(); /* filters are of highest prior */
        }
3353 3354 3355 3356
        /* we warn the slave SQL thread */
        my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
        break;
      }
3357 3358
      if (res)
        break;
3359
    }
3360 3361
    else
    {
3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374
#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
3375

3376 3377 3378 3379 3380 3381
    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);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3382
    break;
monty@mysql.com's avatar
monty@mysql.com committed
3383
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3384
  case SQLCOM_REPLACE:
3385 3386
  case SQLCOM_INSERT:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3387
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
monty@mysql.com's avatar
monty@mysql.com committed
3388
    if ((res= insert_precheck(thd, all_tables)))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3389
      break;
3390 3391 3392 3393 3394 3395 3396 3397

    if (!thd->locked_tables &&
        !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
    {
      res= 1;
      break;
    }

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3398
    res= mysql_insert(thd, all_tables, lex->field_list, lex->many_values,
monty@mishka.local's avatar
monty@mishka.local committed
3399
		      lex->update_list, lex->value_list,
3400
                      lex->duplicates, lex->ignore);
3401 3402 3403 3404 3405 3406 3407

    /*
      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.
    */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3408
    if (first_table->view && !first_table->contain_auto_increment)
3409 3410
      thd->first_successful_insert_id_in_cur_stmt=
        thd->first_successful_insert_id_in_prev_stmt;
3411

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3412
    break;
3413
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3414 3415 3416
  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
monty@mysql.com's avatar
monty@mysql.com committed
3417
    select_result *result;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3418
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
monty@mishka.local's avatar
monty@mishka.local committed
3419
    if ((res= insert_precheck(thd, all_tables)))
3420
      break;
monty@mysql.com's avatar
monty@mysql.com committed
3421

3422
    /* Fix lock for first table */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3423 3424
    if (first_table->lock_type == TL_WRITE_DELAYED)
      first_table->lock_type= TL_WRITE;
3425

3426 3427
    /* Don't unlock tables until command is written to binary log */
    select_lex->options|= SELECT_NO_UNLOCK;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3428

3429
    unit->set_limit(select_lex);
3430 3431 3432 3433 3434 3435 3436 3437

    if (! thd->locked_tables &&
        ! (need_start_waiting= ! wait_if_global_read_lock(thd, 0, 1)))
    {
      res= 1;
      break;
    }

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3438
    if (!(res= open_and_lock_tables(thd, all_tables)))
3439
    {
3440
      /* Skip first table, which is the table we are inserting in */
3441 3442
      TABLE_LIST *second_table= first_table->next_local;
      select_lex->table_list.first= (byte*) second_table;
3443 3444
      select_lex->context.table_list= 
        select_lex->context.first_name_resolution_table= second_table;
3445 3446 3447
      res= mysql_insert_select_prepare(thd);
      if (!res && (result= new select_insert(first_table, first_table->table,
                                             &lex->field_list,
3448 3449
                                             &lex->update_list,
                                             &lex->value_list,
3450
                                             lex->duplicates, lex->ignore)))
3451
      {
3452
	res= handle_select(thd, lex, result, OPTION_SETUP_TABLES_DONE);
3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465
        /*
          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.
        */
        if (first_table->lock_type ==  TL_WRITE_CONCURRENT_INSERT &&
            thd->lock)
        {
          mysql_unlock_tables(thd, thd->lock);
          query_cache_invalidate3(thd, first_table, 1);
          thd->lock=0;
        }
3466 3467
        delete result;
      }
3468
      /* revert changes for SP */
msvensson@neptunus.(none)'s avatar
msvensson@neptunus.(none) committed
3469
      select_lex->table_list.first= (byte*) first_table;
3470
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3471

3472 3473 3474 3475 3476 3477
    /*
      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.
    */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3478
    if (first_table->view && !first_table->contain_auto_increment)
3479 3480
      thd->first_successful_insert_id_in_cur_stmt=
        thd->first_successful_insert_id_in_prev_stmt;
3481

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3482 3483
    break;
  }
3484
  case SQLCOM_TRUNCATE:
3485 3486 3487 3488 3489
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3490 3491
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_one_table_access(thd, DELETE_ACL, all_tables))
3492
      goto error;
3493 3494 3495 3496
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
3497
    if (thd->locked_tables || thd->active_transaction())
3498
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3499 3500
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3501 3502
      goto error;
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3503

monty@mysql.com's avatar
monty@mysql.com committed
3504
    res= mysql_truncate(thd, first_table, 0);
3505
    break;
3506
  case SQLCOM_DELETE:
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3507
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3508 3509
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if ((res= delete_precheck(thd, all_tables)))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3510
      break;
3511 3512
    DBUG_ASSERT(select_lex->offset_limit == 0);
    unit->set_limit(select_lex);
3513 3514 3515 3516 3517 3518 3519 3520

    if (!thd->locked_tables &&
        !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
    {
      res= 1;
      break;
    }

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3521
    res = mysql_delete(thd, all_tables, select_lex->where,
3522
                       &select_lex->order_list,
osku@127.(none)'s avatar
osku@127.(none) committed
3523 3524
                       unit->select_limit_cnt, select_lex->options,
                       FALSE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3525 3526
    break;
  }
3527
  case SQLCOM_DELETE_MULTI:
3528
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3529
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3530
    TABLE_LIST *aux_tables=
3531
      (TABLE_LIST *)thd->lex->auxiliary_table_list.first;
3532
    multi_delete *result;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3533

3534 3535 3536 3537 3538 3539 3540
    if (!thd->locked_tables &&
        !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
    {
      res= 1;
      break;
    }

3541
    if ((res= multi_delete_precheck(thd, all_tables)))
3542
      break;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3543

3544
    /* condition will be TRUE on SP re-excuting */
3545 3546
    if (select_lex->item_list.elements != 0)
      select_lex->item_list.empty();
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
3547
    if (add_item_to_list(thd, new Item_null()))
3548
      goto error;
3549

3550
    thd->proc_info="init";
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3551 3552 3553 3554
    if ((res= open_and_lock_tables(thd, all_tables)))
      break;

    if ((res= mysql_multi_delete_prepare(thd)))
3555
      goto error;
3556

3557
    if (!thd->is_fatal_error && (result= new multi_delete(aux_tables,
3558
							  lex->table_count)))
3559
    {
3560 3561 3562
      res= mysql_select(thd, &select_lex->ref_pointer_array,
			select_lex->get_table_list(),
			select_lex->with_wild,
3563
			select_lex->item_list,
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3564
			select_lex->where,
3565
			0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3566 3567
			(ORDER *)NULL,
			select_lex->options | thd->options |
3568 3569
			SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK |
                        OPTION_SETUP_TABLES_DONE,
3570
			result, unit, select_lex);
3571
      delete result;
3572 3573
    }
    else
3574
      res= TRUE;                                // Error
3575 3576
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3577
  case SQLCOM_DROP_TABLE:
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
3578
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3579
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3580 3581
    if (!lex->drop_temporary)
    {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3582
      if (check_table_access(thd, DROP_ACL, all_tables, 0))
3583 3584
	goto error;				/* purecov: inspected */
      if (end_active_trans(thd))
3585
        goto error;
3586
    }
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
3587
    else
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
3588 3589 3590 3591 3592 3593
    {
      /*
	If this is a slave thread, we may sometimes execute some 
	DROP / * 40005 TEMPORARY * / TABLE
	that come from parts of binlogs (likely if we use RESET SLAVE or CHANGE
	MASTER TO), while the temporary table has already been dropped.
monty@mysql.com's avatar
monty@mysql.com committed
3594 3595
	To not generate such irrelevant "table does not exist errors",
	we silently add IF EXISTS if TEMPORARY was used.
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
3596 3597 3598
      */
      if (thd->slave_thread)
	lex->drop_if_exists= 1;
3599

3600
      /* So that DROP TEMPORARY TABLE gets to binlog at commit/rollback */
3601
      thd->options|= OPTION_KEEP_LOG;
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
3602
    }
3603
    /* DDL and binlog write order protected by LOCK_open */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3604 3605
    res= mysql_rm_table(thd, first_table, lex->drop_if_exists,
			lex->drop_temporary);
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
3606 3607
  }
  break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3608
  case SQLCOM_DROP_INDEX:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3609 3610
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_one_table_access(thd, INDEX_ACL, all_tables))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3611
      goto error;				/* purecov: inspected */
3612
    if (end_active_trans(thd))
3613
      goto error;
3614
    res= mysql_drop_index(thd, first_table, &lex->alter_info);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3615 3616
    break;
  case SQLCOM_SHOW_PROCESSLIST:
3617 3618
    if (!thd->security_ctx->priv_user[0] &&
        check_global_access(thd,PROCESS_ACL))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3619
      break;
hf@deer.(none)'s avatar
hf@deer.(none) committed
3620
    mysqld_list_processes(thd,
3621 3622 3623 3624
			  (thd->security_ctx->master_access & PROCESS_ACL ?
                           NullS :
                           thd->security_ctx->priv_user),
                          lex->verbose);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3625
    break;
3626 3627
  case SQLCOM_SHOW_STORAGE_ENGINES:
    res= mysqld_show_storage_engines(thd);
3628
    break;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3629 3630 3631
  case SQLCOM_SHOW_AUTHORS:
    res= mysqld_show_authors(thd);
    break;
3632 3633 3634
  case SQLCOM_SHOW_CONTRIBUTORS:
    res= mysqld_show_contributors(thd);
    break;
3635 3636 3637 3638 3639 3640
  case SQLCOM_SHOW_PRIVILEGES:
    res= mysqld_show_privileges(thd);
    break;
  case SQLCOM_SHOW_COLUMN_TYPES:
    res= mysqld_show_column_types(thd);
    break;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3641
  case SQLCOM_SHOW_ENGINE_LOGS:
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
3642
#ifdef DONT_ALLOW_SHOW_COMMANDS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3643 3644
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0));	/* purecov: inspected */
3645
    goto error;
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
3646 3647
#else
    {
3648
      if (grant_option && check_access(thd, FILE_ACL, any_db,0,0,0,0))
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
3649
	goto error;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3650
      res= ha_show_status(thd, lex->create_info.db_type, HA_ENGINE_LOGS);
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
3651 3652
      break;
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3653 3654
#endif
  case SQLCOM_CHANGE_DB:
3655 3656
    if (!mysql_change_db(thd,select_lex->db,FALSE))
      send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3657
    break;
3658

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3659 3660
  case SQLCOM_LOAD:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3661
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3662
    uint privilege= (lex->duplicates == DUP_REPLACE ?
3663 3664
		     INSERT_ACL | DELETE_ACL : INSERT_ACL) |
                    (lex->local_file ? 0 : FILE_ACL);
3665

3666
    if (lex->local_file)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3667
    {
3668
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
3669
          !opt_local_infile)
3670
      {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3671
	my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND), MYF(0));
3672 3673
	goto error;
      }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3674
    }
3675 3676 3677 3678

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

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3679
    res= mysql_load(thd, lex->exchange, first_table, lex->field_list,
3680
                    lex->update_list, lex->value_list, lex->duplicates,
3681
                    lex->ignore, (bool) lex->local_file);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3682 3683
    break;
  }
3684

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3685
  case SQLCOM_SET_OPTION:
3686 3687
  {
    List<set_var_base> *lex_var_list= &lex->var_list;
3688
    if ((check_table_access(thd, SELECT_ACL, all_tables, 0) ||
3689 3690
	 open_and_lock_tables(thd, all_tables)))
      goto error;
3691 3692
    if (lex->one_shot_set && not_all_support_one_shot(lex_var_list))
    {
3693 3694
      my_error(ER_RESERVED_SYNTAX, MYF(0), "SET ONE_SHOT");
      goto error;
3695 3696 3697 3698 3699 3700 3701 3702
    }
    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;
3703
      send_ok(thd);
3704
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3705
    break;
3706
  }
3707

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3708
  case SQLCOM_UNLOCK_TABLES:
3709 3710 3711 3712 3713 3714
    /*
      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.
    */
3715
    unlock_locked_tables(thd);
3716 3717
    if (thd->options & OPTION_TABLE_LOCK)
    {
3718
      end_active_trans(thd);
3719
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3720 3721
    }
    if (thd->global_read_lock)
3722
      unlock_global_read_lock(thd);
3723
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3724 3725
    break;
  case SQLCOM_LOCK_TABLES:
3726
    unlock_locked_tables(thd);
3727
    if (end_active_trans(thd))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3728
      goto error;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3729
    if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, all_tables, 0))
3730
      goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3731
    thd->in_lock_tables=1;
3732
    thd->options|= OPTION_TABLE_LOCK;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3733

3734
    if (!(res= simple_open_n_lock_tables(thd, all_tables)))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3735
    {
3736 3737
#ifdef HAVE_QUERY_CACHE
      if (thd->variables.query_cache_wlock_invalidate)
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3738
	query_cache.invalidate_locked_for_write(first_table);
3739
#endif /*HAVE_QUERY_CACHE*/
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3740 3741
      thd->locked_tables=thd->lock;
      thd->lock=0;
3742
      send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3743
    }
3744 3745
    else
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3746 3747 3748
    thd->in_lock_tables=0;
    break;
  case SQLCOM_CREATE_DB:
3749
  {
3750 3751 3752 3753 3754
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
3755
    char *alias;
vva@eagle.mysql.r18.ru's avatar
vva@eagle.mysql.r18.ru committed
3756
    if (!(alias=thd->strdup(lex->name)) || check_db_name(lex->name))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3757
    {
3758
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3759 3760
      break;
    }
3761 3762 3763
    /*
      If in a slave thread :
      CREATE DATABASE DB was certainly not preceded by USE DB.
3764
      For that reason, db_ok() in sql/slave.cc did not check the
3765 3766 3767
      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.
    */
3768
#ifdef HAVE_REPLICATION
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3769 3770 3771
    if (thd->slave_thread && 
	(!rpl_filter->db_ok(lex->name) ||
	 !rpl_filter->db_ok_with_wild_table(lex->name)))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3772
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3773
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
3774
      break;
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3775
    }
3776
#endif
3777
    if (check_access(thd,CREATE_ACL,lex->name,0,1,0,is_schema_db(lex->name)))
3778
      break;
monty@mysql.com's avatar
monty@mysql.com committed
3779
    res= mysql_create_db(thd,(lower_case_table_names == 2 ? alias : lex->name),
monty@mysql.com's avatar
monty@mysql.com committed
3780
			 &lex->create_info, 0);
3781 3782
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3783
  case SQLCOM_DROP_DB:
3784
  {
3785 3786 3787 3788 3789
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
3790
    if (check_db_name(lex->name))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3791
    {
3792
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3793 3794
      break;
    }
3795 3796 3797 3798 3799 3800 3801
    /*
      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.
    */
3802
#ifdef HAVE_REPLICATION
3803
    if (thd->slave_thread && 
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3804 3805
	(!rpl_filter->db_ok(lex->name) ||
	 !rpl_filter->db_ok_with_wild_table(lex->name)))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3806
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3807
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
3808
      break;
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3809
    }
3810
#endif
3811
    if (check_access(thd,DROP_ACL,lex->name,0,1,0,is_schema_db(lex->name)))
3812
      break;
3813 3814
    if (thd->locked_tables || thd->active_transaction())
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3815 3816
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3817 3818
      goto error;
    }
3819
    res= mysql_rm_db(thd, lex->name, lex->drop_if_exists, 0);
3820 3821
    break;
  }
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863
  case SQLCOM_RENAME_DB:
  {
    LEX_STRING *olddb, *newdb;
    List_iterator <LEX_STRING> db_list(lex->db_list);
    olddb= db_list++;
    newdb= db_list++;
    if (end_active_trans(thd))
    {
      res= 1;
      break;
    }
#ifdef HAVE_REPLICATION
    if (thd->slave_thread && 
       (!rpl_filter->db_ok(olddb->str) ||
        !rpl_filter->db_ok(newdb->str) ||
        !rpl_filter->db_ok_with_wild_table(olddb->str) ||
        !rpl_filter->db_ok_with_wild_table(newdb->str)))
    {
      res= 1;
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
      break;
    }
#endif
    if (check_access(thd,ALTER_ACL,olddb->str,0,1,0,is_schema_db(olddb->str)) ||
        check_access(thd,DROP_ACL,olddb->str,0,1,0,is_schema_db(olddb->str)) ||
        check_access(thd,CREATE_ACL,newdb->str,0,1,0,is_schema_db(newdb->str)))
    {
      res= 1;
      break;
    }
    if (thd->locked_tables || thd->active_transaction())
    {
      res= 1;
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
      goto error;
    }
    res= mysql_rename_db(thd, olddb, newdb);
    if (!res)
      send_ok(thd);
    break;
  }
3864 3865
  case SQLCOM_ALTER_DB:
  {
3866 3867
    char *db= lex->name;
    DBUG_ASSERT(db); /* Must be set in the parser */
3868
    if (!strip_sp(db) || check_db_name(db))
3869
    {
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3870
      my_error(ER_WRONG_DB_NAME, MYF(0), db);
3871 3872
      break;
    }
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3873 3874 3875
    /*
      If in a slave thread :
      ALTER DATABASE DB may not be preceded by USE DB.
3876
      For that reason, maybe db_ok() in sql/slave.cc did not check the
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3877 3878 3879 3880
      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
3881
    if (thd->slave_thread &&
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3882 3883
	(!rpl_filter->db_ok(db) ||
	 !rpl_filter->db_ok_with_wild_table(db)))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3884
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3885
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3886 3887 3888
      break;
    }
#endif
3889
    if (check_access(thd, ALTER_ACL, db, 0, 1, 0, is_schema_db(db)))
3890 3891 3892
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3893 3894
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3895 3896
      goto error;
    }
3897
    res= mysql_alter_db(thd, db, &lex->create_info);
3898 3899
    break;
  }
3900 3901 3902 3903
  case SQLCOM_SHOW_CREATE_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
3904
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
3905 3906
      break;
    }
3907
    res=mysqld_show_create_db(thd,lex->name,&lex->create_info);
3908 3909
    break;
  }
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3910 3911 3912
  case SQLCOM_CREATE_EVENT:
  case SQLCOM_ALTER_EVENT:
  {
3913
    DBUG_ASSERT(lex->event_parse_data);
3914 3915 3916 3917 3918 3919
    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;
    }
3920 3921
    switch (lex->sql_command) {
    case SQLCOM_CREATE_EVENT:
3922 3923
      res= Events::get_instance()->
            create_event(thd, lex->event_parse_data,
3924
                         lex->create_info.options & HA_LEX_CREATE_IF_NOT_EXISTS);
3925 3926
      break;
    case SQLCOM_ALTER_EVENT:
3927 3928
      res= Events::get_instance()->update_event(thd, lex->event_parse_data,
                                                lex->spname);
3929
      break;
3930 3931
    default:
      DBUG_ASSERT(0);
3932
    }
3933
    DBUG_PRINT("info",("DDL error code=%d", res));
3934
    if (!res)
3935
      send_ok(thd);
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3936

3937
    /* Don't do it, if we are inside a SP */
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3938 3939
    if (!thd->spcont)
    {
3940 3941
      delete lex->sphead;
      lex->sphead= NULL;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3942
    }
3943 3944

    /* lex->unit.cleanup() is called outside, no need to call it here */
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3945 3946
    break;
  }
3947
  case SQLCOM_DROP_EVENT:
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3948 3949 3950 3951 3952 3953
  case SQLCOM_SHOW_CREATE_EVENT:
  {
    DBUG_ASSERT(lex->spname);
    if (! lex->spname->m_db.str)
    {
      my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
3954
      goto error;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3955 3956 3957 3958 3959 3960 3961 3962
    }
    if (check_access(thd, EVENT_ACL, lex->spname->m_db.str, 0, 0, 0,
                     is_schema_db(lex->spname->m_db.str)))
      break;

    if (lex->spname->m_name.length > NAME_LEN)
    {
      my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str);
3963
      /* this jumps to the end of the function and skips own messaging */
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3964 3965
      goto error;
    }
3966 3967

    if (lex->sql_command == SQLCOM_SHOW_CREATE_EVENT)
3968 3969
      res= Events::get_instance()->show_create_event(thd, lex->spname->m_db,
                                                     lex->spname->m_name);
3970 3971
    else
    {
3972
      uint affected= 1;
3973 3974 3975 3976 3977
      if (!(res= Events::get_instance()->drop_event(thd,
                                                    lex->spname->m_db,
                                                    lex->spname->m_name,
                                                    lex->drop_if_exists,
                                                    FALSE)))
3978
        send_ok(thd);
3979
    }
3980 3981
    break;
  }
monty@mysql.com's avatar
monty@mysql.com committed
3982
  case SQLCOM_CREATE_FUNCTION:                  // UDF function
monty@mysql.com's avatar
monty@mysql.com committed
3983
  {
3984
    if (check_access(thd,INSERT_ACL,"mysql",0,1,0,0))
monty@mysql.com's avatar
monty@mysql.com committed
3985
      break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3986
#ifdef HAVE_DLOPEN
3987 3988
    if (sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname,
                        &thd->sp_func_cache, FALSE))
monty@mysql.com's avatar
monty@mysql.com committed
3989
    {
3990
      my_error(ER_UDF_EXISTS, MYF(0), lex->spname->m_name.str);
monty@mysql.com's avatar
monty@mysql.com committed
3991 3992
      goto error;
    }
3993
    if (!(res = mysql_create_function(thd, &lex->udf)))
monty@mysql.com's avatar
monty@mysql.com committed
3994
      send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3995
#else
hf@deer.(none)'s avatar
hf@deer.(none) committed
3996
    my_error(ER_CANT_OPEN_LIBRARY, MYF(0), lex->udf.dl, 0, "feature disabled");
3997
    res= TRUE;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3998 3999
#endif
    break;
monty@mysql.com's avatar
monty@mysql.com committed
4000
  }
hf@deer.(none)'s avatar
hf@deer.(none) committed
4001
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4002 4003
  case SQLCOM_CREATE_USER:
  {
4004
    if (check_access(thd, INSERT_ACL, "mysql", 0, 1, 1, 0) &&
4005
        check_global_access(thd,CREATE_USER_ACL))
4006
      break;
4007 4008
    if (end_active_trans(thd))
      goto error;
4009
    /* Conditionally writes to binlog */
4010 4011 4012 4013
    if (!(res= mysql_create_user(thd, lex->users_list)))
      send_ok(thd);
    break;
  }
4014 4015
  case SQLCOM_DROP_USER:
  {
4016
    if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 1, 0) &&
4017
        check_global_access(thd,CREATE_USER_ACL))
4018
      break;
4019 4020
    if (end_active_trans(thd))
      goto error;
4021
    /* Conditionally writes to binlog */
4022
    if (!(res= mysql_drop_user(thd, lex->users_list)))
4023 4024 4025 4026 4027
      send_ok(thd);
    break;
  }
  case SQLCOM_RENAME_USER:
  {
4028
    if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1, 0) &&
4029
        check_global_access(thd,CREATE_USER_ACL))
4030
      break;
4031 4032
    if (end_active_trans(thd))
      goto error;
4033
    /* Conditionally writes to binlog */
4034
    if (!(res= mysql_rename_user(thd, lex->users_list)))
4035 4036 4037 4038 4039
      send_ok(thd);
    break;
  }
  case SQLCOM_REVOKE_ALL:
  {
4040
    if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1, 0) &&
4041
        check_global_access(thd,CREATE_USER_ACL))
4042
      break;
4043
    /* Conditionally writes to binlog */
4044 4045 4046 4047
    if (!(res = mysql_revoke_all(thd, lex->users_list)))
      send_ok(thd);
    break;
  }
4048 4049 4050 4051
  case SQLCOM_REVOKE:
  case SQLCOM_GRANT:
  {
    if (check_access(thd, lex->grant | lex->grant_tot_col | GRANT_ACL,
serg@serg.mylan's avatar
serg@serg.mylan committed
4052
		     first_table ?  first_table->db : select_lex->db,
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4053
		     first_table ? &first_table->grant.privilege : 0,
4054 4055 4056
		     first_table ? 0 : 1, 0,
                     first_table ? (bool) first_table->schema_table :
                     select_lex->db ? is_schema_db(select_lex->db) : 0))
4057 4058
      goto error;

4059
    if (thd->security_ctx->user)              // If not replication
4060
    {
4061
      LEX_USER *user, *tmp_user;
4062

4063
      List_iterator <LEX_USER> user_list(lex->users_list);
4064
      while ((tmp_user= user_list++))
4065
      {
4066 4067
        if (!(user= get_current_user(thd, tmp_user)))
          goto error;
4068 4069 4070 4071 4072 4073 4074 4075
        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);
4076
        if (strcmp(thd->security_ctx->user, user->user.str) ||
4077
            my_strcasecmp(system_charset_info,
4078
                          user->host.str, thd->security_ctx->host_or_ip))
4079 4080
        {
          // TODO: use check_change_password()
4081 4082
          if (is_acl_user(user->host.str, user->user.str) &&
              user->password.str &&
4083
              check_access(thd, UPDATE_ACL,"mysql",0,1,1,0))
4084 4085 4086 4087 4088 4089
          {
            my_message(ER_PASSWORD_NOT_ALLOWED,
                       ER(ER_PASSWORD_NOT_ALLOWED), MYF(0));
            goto error;
          }
        }
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
4090 4091
      }
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4092
    if (first_table)
4093
    {
4094 4095
      if (lex->type == TYPE_ENUM_PROCEDURE ||
          lex->type == TYPE_ENUM_FUNCTION)
4096 4097 4098 4099 4100
      {
        uint grants= lex->all_privileges 
		   ? (PROC_ACLS & ~GRANT_ACL) | (lex->grant & GRANT_ACL)
		   : lex->grant;
        if (grant_option && 
4101 4102
	    check_grant_routine(thd, grants | GRANT_ACL, all_tables,
                                lex->type == TYPE_ENUM_PROCEDURE, 0))
4103
	  goto error;
4104
        /* Conditionally writes to binlog */
4105 4106 4107 4108
        res= mysql_routine_grant(thd, all_tables,
                                 lex->type == TYPE_ENUM_PROCEDURE, 
                                 lex->users_list, grants,
                                 lex->sql_command == SQLCOM_REVOKE, 0);
4109 4110 4111 4112 4113 4114 4115 4116
      }
      else
      {
	if (grant_option && check_grant(thd,
					(lex->grant | lex->grant_tot_col |
					 GRANT_ACL),
					all_tables, 0, UINT_MAX, 0))
	  goto error;
4117
        /* Conditionally writes to binlog */
4118 4119 4120 4121
        res= mysql_table_grant(thd, all_tables, lex->users_list,
			       lex->columns, lex->grant,
			       lex->sql_command == SQLCOM_REVOKE);
      }
4122 4123 4124
    }
    else
    {
4125
      if (lex->columns.elements || lex->type)
4126
      {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4127 4128
	my_message(ER_ILLEGAL_GRANT_FOR_TABLE, ER(ER_ILLEGAL_GRANT_FOR_TABLE),
                   MYF(0));
4129
        goto error;
4130 4131
      }
      else
4132
	/* Conditionally writes to binlog */
4133 4134 4135 4136
	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
			  lex->sql_command == SQLCOM_REVOKE);
      if (!res)
      {
4137
	if (lex->sql_command == SQLCOM_GRANT)
4138
	{
4139
	  List_iterator <LEX_USER> str_list(lex->users_list);
4140 4141 4142 4143 4144
	  LEX_USER *user, *tmp_user;
	  while ((tmp_user=str_list++))
          {
            if (!(user= get_current_user(thd, tmp_user)))
              goto error;
monty@mysql.com's avatar
monty@mysql.com committed
4145
	    reset_mqh(user);
4146
          }
4147
	}
4148 4149 4150 4151
      }
    }
    break;
  }
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
4152
#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/
monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
4153
  case SQLCOM_RESET:
4154 4155 4156
    /*
      RESET commands are never written to the binary log, so we have to
      initialize this variable because RESET shares the same code as FLUSH
4157 4158 4159 4160
    */
    lex->no_write_to_binlog= 1;
  case SQLCOM_FLUSH:
  {
4161
    bool write_to_binlog;
4162
    if (check_global_access(thd,RELOAD_ACL))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4163
      goto error;
4164 4165 4166 4167
    /*
      reload_acl_and_cache() will tell us if we are allowed to write to the
      binlog or not.
    */
4168
    if (!reload_acl_and_cache(thd, lex->type, first_table, &write_to_binlog))
4169 4170 4171 4172 4173
    {
      /*
        We WANT to write and we CAN write.
        ! we write after unlocking the table.
      */
4174
      /* Presumably, RESET and binlog writing doesn't require synchronization */
4175 4176 4177 4178
      if (!lex->no_write_to_binlog && write_to_binlog)
      {
        if (mysql_bin_log.is_open())
        {
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
4179 4180
          thd->binlog_query(THD::STMT_QUERY_TYPE,
                            thd->query, thd->query_length, 0, FALSE);
4181 4182 4183 4184
        }
      }
      send_ok(thd);
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4185
    break;
4186
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4187
  case SQLCOM_KILL:
4188 4189 4190
  {
    Item *it= (Item *)lex->value_list.head();

4191 4192 4193 4194 4195 4196 4197
    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;
    }

4198
    if ((!it->fixed && it->fix_fields(lex->thd, &it)) || it->check_cols(1))
4199 4200 4201 4202 4203
    {
      my_message(ER_SET_CONSTANTS_ONLY, ER(ER_SET_CONSTANTS_ONLY),
		 MYF(0));
      goto error;
    }
4204
    sql_kill(thd, (ulong)it->val_int(), lex->type & ONLY_KILL_QUERY);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4205
    break;
4206
  }
hf@deer.(none)'s avatar
hf@deer.(none) committed
4207
#ifndef NO_EMBEDDED_ACCESS_CHECKS
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4208
  case SQLCOM_SHOW_GRANTS:
4209 4210 4211 4212
  {
    LEX_USER *grant_user= get_current_user(thd, lex->grant_user);
    if (!grant_user)
      goto error;
4213
    if ((thd->security_ctx->priv_user &&
4214
	 !strcmp(thd->security_ctx->priv_user, grant_user->user.str)) ||
4215
	!check_access(thd, SELECT_ACL, "mysql",0,1,0,0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4216
    {
4217
      res = mysql_show_grants(thd, grant_user);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4218 4219
    }
    break;
4220
  }
hf@deer.(none)'s avatar
hf@deer.(none) committed
4221
#endif
4222
  case SQLCOM_HA_OPEN:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4223
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
4224
    if (check_table_access(thd, SELECT_ACL, all_tables, 0))
4225
      goto error;
monty@mysql.com's avatar
monty@mysql.com committed
4226
    res= mysql_ha_open(thd, first_table, 0);
4227 4228
    break;
  case SQLCOM_HA_CLOSE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4229 4230
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    res= mysql_ha_close(thd, first_table);
4231 4232
    break;
  case SQLCOM_HA_READ:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4233
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
4234 4235 4236 4237 4238
    /*
      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.
    */
4239
    unit->set_limit(select_lex);
4240
    res= mysql_ha_read(thd, first_table, lex->ha_read_mode, lex->ident.str,
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4241
                       lex->insert_list, lex->ha_rkey_mode, select_lex->where,
4242
                       unit->select_limit_cnt, unit->offset_limit_cnt);
4243 4244
    break;

bk@work.mysql.com's avatar
bk@work.mysql.com committed
4245
  case SQLCOM_BEGIN:
4246 4247 4248 4249 4250 4251
    if (thd->transaction.xid_state.xa_state != XA_NOTR)
    {
      my_error(ER_XAER_RMFAIL, MYF(0),
               xa_state_names[thd->transaction.xid_state.xa_state]);
      break;
    }
4252
    if (begin_trans(thd))
4253
      goto error;
serg@serg.mylan's avatar
serg@serg.mylan committed
4254
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4255 4256
    break;
  case SQLCOM_COMMIT:
4257
    if (end_trans(thd, lex->tx_release ? COMMIT_RELEASE :
serg@serg.mylan's avatar
serg@serg.mylan committed
4258
                              lex->tx_chain ? COMMIT_AND_CHAIN : COMMIT))
4259
      goto error;
4260
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4261 4262
    break;
  case SQLCOM_ROLLBACK:
4263
    if (end_trans(thd, lex->tx_release ? ROLLBACK_RELEASE :
serg@serg.mylan's avatar
serg@serg.mylan committed
4264
                              lex->tx_chain ? ROLLBACK_AND_CHAIN : ROLLBACK))
4265
      goto error;
4266
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4267
    break;
serg@serg.mylan's avatar
serg@serg.mylan committed
4268
  case SQLCOM_RELEASE_SAVEPOINT:
serg@serg.mylan's avatar
serg@serg.mylan committed
4269
  {
4270 4271
    SAVEPOINT *sv;
    for (sv=thd->transaction.savepoints; sv; sv=sv->prev)
serg@serg.mylan's avatar
serg@serg.mylan committed
4272 4273 4274
    {
      if (my_strnncoll(system_charset_info,
                       (uchar *)lex->ident.str, lex->ident.length,
4275
                       (uchar *)sv->name, sv->length) == 0)
serg@serg.mylan's avatar
serg@serg.mylan committed
4276 4277
        break;
    }
4278
    if (sv)
serg@serg.mylan's avatar
serg@serg.mylan committed
4279
    {
4280
      if (ha_release_savepoint(thd, sv))
serg@serg.mylan's avatar
serg@serg.mylan committed
4281
        res= TRUE; // cannot happen
serg@serg.mylan's avatar
serg@serg.mylan committed
4282 4283
      else
        send_ok(thd);
4284
      thd->transaction.savepoints=sv->prev;
serg@serg.mylan's avatar
serg@serg.mylan committed
4285
    }
4286
    else
serg@serg.mylan's avatar
serg@serg.mylan committed
4287
      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4288
    break;
serg@serg.mylan's avatar
serg@serg.mylan committed
4289
  }
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
4290
  case SQLCOM_ROLLBACK_TO_SAVEPOINT:
serg@serg.mylan's avatar
serg@serg.mylan committed
4291
  {
4292 4293
    SAVEPOINT *sv;
    for (sv=thd->transaction.savepoints; sv; sv=sv->prev)
4294 4295 4296
    {
      if (my_strnncoll(system_charset_info,
                       (uchar *)lex->ident.str, lex->ident.length,
4297
                       (uchar *)sv->name, sv->length) == 0)
4298 4299
        break;
    }
4300
    if (sv)
4301
    {
4302
      if (ha_rollback_to_savepoint(thd, sv))
4303 4304
        res= TRUE; // cannot happen
      else
serg@serg.mylan's avatar
serg@serg.mylan committed
4305
      {
4306 4307
        if ((thd->options &
             (OPTION_STATUS_NO_TRANS_UPDATE | OPTION_KEEP_LOG)) &&
serg@serg.mylan's avatar
serg@serg.mylan committed
4308 4309 4310 4311 4312 4313
            !thd->slave_thread)
          push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                       ER_WARNING_NOT_COMPLETE_ROLLBACK,
                       ER(ER_WARNING_NOT_COMPLETE_ROLLBACK));
        send_ok(thd);
      }
4314
      thd->transaction.savepoints=sv;
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
4315 4316
    }
    else
4317
      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
4318
    break;
4319
  }
4320
  case SQLCOM_SAVEPOINT:
4321 4322
    if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN) ||
          thd->in_sub_stmt) || !opt_using_transactions)
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
4323
      send_ok(thd);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
4324
    else
4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362
    {
      SAVEPOINT **sv, *newsv;
      for (sv=&thd->transaction.savepoints; *sv; sv=&(*sv)->prev)
      {
        if (my_strnncoll(system_charset_info,
                         (uchar *)lex->ident.str, lex->ident.length,
                         (uchar *)(*sv)->name, (*sv)->length) == 0)
          break;
      }
      if (*sv) /* old savepoint of the same name exists */
      {
        newsv=*sv;
        ha_release_savepoint(thd, *sv); // it cannot fail
        *sv=(*sv)->prev;
      }
      else if ((newsv=(SAVEPOINT *) alloc_root(&thd->transaction.mem_root,
                                               savepoint_alloc_size)) == 0)
      {
        my_error(ER_OUT_OF_RESOURCES, MYF(0));
        break;
      }
      newsv->name=strmake_root(&thd->transaction.mem_root,
                               lex->ident.str, lex->ident.length);
      newsv->length=lex->ident.length;
      /*
        if we'll get an error here, don't add new savepoint to the list.
        we'll lose a little bit of memory in transaction mem_root, but it'll
        be free'd when transaction ends anyway
      */
      if (ha_savepoint(thd, newsv))
        res= TRUE;
      else
      {
        newsv->prev=thd->transaction.savepoints;
        thd->transaction.savepoints=newsv;
        send_ok(thd);
      }
    }
4363
    break;
4364 4365
  case SQLCOM_CREATE_PROCEDURE:
  case SQLCOM_CREATE_SPFUNCTION:
monty@mysql.com's avatar
monty@mysql.com committed
4366
  {
4367
    uint namelen;
4368
    char *name;
4369
    int result;
4370

4371
    DBUG_ASSERT(lex->sphead != 0);
4372
    DBUG_ASSERT(lex->sphead->m_db.str); /* Must be initialized in the parser */
4373

4374 4375
    if (check_access(thd, CREATE_PROC_ACL, lex->sphead->m_db.str, 0, 0, 0,
                     is_schema_db(lex->sphead->m_db.str)))
4376 4377 4378 4379 4380 4381
    {
      delete lex->sphead;
      lex->sphead= 0;
      goto error;
    }

4382
    if (end_active_trans(thd)) 
4383
    {
4384 4385 4386
      delete lex->sphead;
      lex->sphead= 0;
      goto error;
4387
    }
4388 4389

    name= lex->sphead->name(&namelen);
4390
#ifdef HAVE_DLOPEN
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4391 4392 4393
    if (lex->sphead->m_type == TYPE_ENUM_FUNCTION)
    {
      udf_func *udf = find_udf(name, namelen);
4394

monty@mysql.com's avatar
monty@mysql.com committed
4395
      if (udf)
4396
      {
4397
	my_error(ER_UDF_EXISTS, MYF(0), name);
4398
	delete lex->sphead;
4399
	lex->sphead= 0;
4400
	goto error;
4401
      }
monty@mysql.com's avatar
monty@mysql.com committed
4402 4403 4404
    }
#endif

4405 4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425 4426 4427 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 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484 4485 4486 4487 4488
    /*
      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)
    {
      bool res= FALSE;
      Query_arena original_arena;
      Query_arena *ps_arena = thd->activate_stmt_arena_if_needed(&original_arena);

      if (!(lex->definer= create_default_definer(thd)))
        res= TRUE;

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

      if (res)
      {
        /* Error has been already reported. */
        delete lex->sphead;
        lex->sphead= 0;
        goto error;
      }

      if (thd->slave_thread)
        lex->sphead->m_chistics->suid= SP_IS_NOT_SUID;
    }

    /*
      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).
    */
    
    else 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))
    {
      if (check_global_access(thd, SUPER_ACL))
      {
        my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), "SUPER");
        delete lex->sphead;
        lex->sphead= 0;
        goto error;
      }
    }

    /* 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 */

4489
    res= (result= lex->sphead->create(thd));
4490 4491
    if (result == SP_OK)
    {
4492
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4493
      /* only add privileges if really neccessary */
4494
      if (sp_automatic_privileges && !opt_noacl &&
4495
          check_routine_access(thd, DEFAULT_CREATE_PROC_ACLS,
4496
      			       lex->sphead->m_db.str, name,
4497
                               lex->sql_command == SQLCOM_CREATE_PROCEDURE, 1))
4498
      {
4499
        if (sp_grant_privileges(thd, lex->sphead->m_db.str, name,
4500
                                lex->sql_command == SQLCOM_CREATE_PROCEDURE))
4501 4502 4503
          push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 
	  	       ER_PROC_AUTO_GRANT_FAIL,
		       ER(ER_PROC_AUTO_GRANT_FAIL));
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cmiller@zippy.(none) committed
4504
        close_thread_tables(thd);
4505
      }
4506
#endif
4507 4508 4509
      lex->unit.cleanup();
      delete lex->sphead;
      lex->sphead= 0;
4510
      send_ok(thd);
4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 4522 4523 4524 4525 4526 4527 4528 4529 4530
    }
    else
    {
      switch (result) {
      case SP_WRITE_ROW_FAILED:
	my_error(ER_SP_ALREADY_EXISTS, MYF(0), SP_TYPE_STRING(lex), name);
	break;
      case SP_NO_DB_ERROR:
	my_error(ER_BAD_DB_ERROR, MYF(0), lex->sphead->m_db.str);
	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;
      default:
	my_error(ER_SP_STORE_FAILED, MYF(0), SP_TYPE_STRING(lex), name);
	break;
      }
4531
      lex->unit.cleanup();
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4532 4533 4534
      delete lex->sphead;
      lex->sphead= 0;
      goto error;
4535
    }
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monty@mysql.com committed
4536 4537
    break;
  }
4538 4539 4540 4541
  case SQLCOM_CALL:
    {
      sp_head *sp;

4542 4543 4544 4545 4546 4547 4548 4549 4550
      /*
        This will cache all SP and SF and open and lock all tables
        required for execution.
      */
      if (check_table_access(thd, SELECT_ACL, all_tables, 0) ||
	  open_and_lock_tables(thd, all_tables))
       goto error;

      /*
4551 4552
        By this moment all needed SPs should be in cache so no need to look 
        into DB. 
4553
      */
4554 4555
      if (!(sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname,
                                &thd->sp_proc_cache, TRUE)))
4556
      {
4557
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "PROCEDURE",
4558
                 lex->spname->m_qname.str);
4559
	goto error;
4560 4561 4562
      }
      else
      {
pem@mysql.comhem.se's avatar
pem@mysql.comhem.se committed
4563
	ha_rows select_limit;
monty@mysql.com's avatar
monty@mysql.com committed
4564 4565
        /* bits that should be cleared in thd->server_status */
	uint bits_to_be_cleared= 0;
4566 4567 4568 4569 4570 4571 4572 4573 4574 4575 4576 4577
        /*
          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;
        }
4578

4579 4580 4581 4582 4583 4584 4585 4586 4587 4588 4589
        /*
          Throw an error if a non-deterministic procedure is called while
          statement-based replication (SBR) is active.
         */
        if (!sp->m_chistics->detistic &&
            (mysql_bin_log.is_open() &&
             thd->variables.binlog_format == BINLOG_FORMAT_STMT))
        {
          my_error(ER_BINLOG_ROW_RBR_TO_SBR, MYF(0));
          goto error;
        }
4590

4591 4592
	my_bool nsok= thd->net.no_send_ok;
	thd->net.no_send_ok= TRUE;
4593
	if (sp->m_flags & sp_head::MULTI_RESULTS)
4594
	{
4595
	  if (! (thd->client_capabilities & CLIENT_MULTI_RESULTS))
4596
	  {
4597 4598 4599 4600
            /*
              The client does not support multiple result sets being sent
              back
            */
4601
	    my_error(ER_SP_BADSELECT, MYF(0), sp->m_qname.str);
4602 4603 4604
	    thd->net.no_send_ok= nsok;
	    goto error;
	  }
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4605 4606 4607 4608 4609 4610 4611
          /*
            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;
4612 4613
	}

4614
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4615
	if (check_routine_access(thd, EXECUTE_ACL,
4616
				 sp->m_db.str, sp->m_name.str, TRUE, FALSE))
4617 4618 4619 4620
	{
	  thd->net.no_send_ok= nsok;
	  goto error;
	}
4621
#endif
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4622 4623
	select_limit= thd->variables.select_limit;
	thd->variables.select_limit= HA_POS_ERROR;
4624

4625
        thd->row_count_func= 0;
4626 4627
        
        /* 
4628
          We never write CALL statements into binlog:
4629 4630 4631 4632 4633
           - 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.
4634
        */
4635
	res= sp->execute_procedure(thd, &lex->value_list);
4636 4637 4638
	/*
          If warnings have been cleared, we have to clear total_warn_count
          too, otherwise the clients get confused.
4639 4640 4641 4642
	 */
	if (thd->warn_list.is_empty())
	  thd->total_warn_count= 0;

pem@mysql.comhem.se's avatar
pem@mysql.comhem.se committed
4643
	thd->variables.select_limit= select_limit;
4644

4645
	thd->net.no_send_ok= nsok;
monty@mysql.com's avatar
monty@mysql.com committed
4646
        thd->server_status&= ~bits_to_be_cleared;
4647

4648
	if (!res)
monty@mysql.com's avatar
monty@mysql.com committed
4649 4650
	  send_ok(thd, (ulong) (thd->row_count_func < 0 ? 0 :
                                thd->row_count_func));
4651
	else
4652 4653
        {
          DBUG_ASSERT(thd->net.report_error == 1 || thd->killed);
4654
	  goto error;		// Substatement should already have sent error
4655
        }
4656
      }
4657
      break;
4658 4659
    }
  case SQLCOM_ALTER_PROCEDURE:
4660
  case SQLCOM_ALTER_FUNCTION:
4661
    {
4662
      int result;
4663 4664 4665 4666
      sp_head *sp;
      st_sp_chistics chistics;

      memcpy(&chistics, &lex->sp_chistics, sizeof(chistics));
4667
      if (lex->sql_command == SQLCOM_ALTER_PROCEDURE)
4668 4669
        sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname,
                            &thd->sp_proc_cache, FALSE);
4670
      else
4671 4672
        sp= sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname,
                            &thd->sp_func_cache, FALSE);
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monty@mysql.com committed
4673
      mysql_reset_errors(thd, 0);
4674
      if (! sp)
4675 4676 4677 4678 4679 4680 4681 4682 4683
      {
	if (lex->spname->m_db.str)
	  result= SP_KEY_NOT_FOUND;
	else
	{
	  my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
	  goto error;
	}
      }
4684 4685
      else
      {
4686 4687 4688
        if (check_routine_access(thd, ALTER_PROC_ACL, sp->m_db.str, 
				 sp->m_name.str,
                                 lex->sql_command == SQLCOM_ALTER_PROCEDURE, 0))
4689
	  goto error;
4690 4691 4692

        if (end_active_trans(thd)) 
          goto error;
4693
	memcpy(&lex->sp_chistics, &chistics, sizeof(lex->sp_chistics));
4694 4695
        if ((sp->m_type == TYPE_ENUM_FUNCTION) &&
            !trust_function_creators &&  mysql_bin_log.is_open() &&
4696 4697 4698 4699 4700 4701 4702 4703 4704 4705
            !sp->m_chistics->detistic &&
            (chistics.daccess == SP_CONTAINS_SQL ||
             chistics.daccess == SP_MODIFIES_SQL_DATA))
        {
          my_message(ER_BINLOG_UNSAFE_ROUTINE,
		     ER(ER_BINLOG_UNSAFE_ROUTINE), MYF(0));
          result= SP_INTERNAL_ERROR;
        }
        else
        {
4706 4707 4708 4709 4710 4711
          /*
            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.
          */
4712
          if (lex->sql_command == SQLCOM_ALTER_PROCEDURE)
4713
            /* Conditionally writes to binlog */
4714 4715
            result= sp_update_procedure(thd, lex->spname, &lex->sp_chistics);
          else
4716
            /* Conditionally writes to binlog */
4717 4718
            result= sp_update_function(thd, lex->spname, &lex->sp_chistics);
        }
4719
      }
4720
      switch (result)
4721
      {
4722
      case SP_OK:
4723
	send_ok(thd);
4724 4725
	break;
      case SP_KEY_NOT_FOUND:
4726 4727
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4728 4729
	goto error;
      default:
4730 4731
	my_error(ER_SP_CANT_ALTER, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4732
	goto error;
4733
      }
4734
      break;
4735 4736
    }
  case SQLCOM_DROP_PROCEDURE:
4737
  case SQLCOM_DROP_FUNCTION:
4738
    {
4739
      int result;
4740 4741
      int type= (lex->sql_command == SQLCOM_DROP_PROCEDURE ?
                 TYPE_ENUM_PROCEDURE : TYPE_ENUM_FUNCTION);
4742

4743
      result= sp_routine_exists_in_table(thd, type, lex->spname);
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monty@mysql.com committed
4744
      mysql_reset_errors(thd, 0);
4745
      if (result == SP_OK)
4746
      {
4747 4748 4749
        char *db= lex->spname->m_db.str;
	char *name= lex->spname->m_name.str;

4750 4751
	if (check_routine_access(thd, ALTER_PROC_ACL, db, name,
                                 lex->sql_command == SQLCOM_DROP_PROCEDURE, 0))
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merge  
bell@sanja.is.com.ua committed
4752
          goto error;
4753 4754 4755

        if (end_active_trans(thd)) 
          goto error;
4756
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4757
	if (sp_automatic_privileges && !opt_noacl &&
4758 4759
	    sp_revoke_privileges(thd, db, name, 
                                 lex->sql_command == SQLCOM_DROP_PROCEDURE))
4760 4761 4762 4763 4764
	{
	  push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 
		       ER_PROC_AUTO_REVOKE_FAIL,
		       ER(ER_PROC_AUTO_REVOKE_FAIL));
	}
4765
#endif
4766
	if (lex->sql_command == SQLCOM_DROP_PROCEDURE)
4767 4768
          /* Conditionally writes to binlog */
	  result= sp_drop_procedure(thd, lex->spname); /* Conditionally writes to binlog */
4769
	else
4770 4771
          /* Conditionally writes to binlog */
	  result= sp_drop_function(thd, lex->spname); /* Conditionally writes to binlog */
4772 4773 4774
      }
      else
      {
4775
#ifdef HAVE_DLOPEN
4776 4777 4778 4779 4780 4781
	if (lex->sql_command == SQLCOM_DROP_FUNCTION)
	{
          udf_func *udf = find_udf(lex->spname->m_name.str,
                                   lex->spname->m_name.length);
          if (udf)
          {
4782
	    if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 0, 0))
4783
	      goto error;
4784 4785

	    /* Does NOT write to binlog */
4786
	    if (!(res = mysql_drop_function(thd, &lex->spname->m_name)))
4787
	    {
4788 4789
	      send_ok(thd);
	      break;
4790 4791
	    }
	  }
4792
	}
4793
#endif
4794 4795 4796 4797 4798 4799 4800
	if (lex->spname->m_db.str)
	  result= SP_KEY_NOT_FOUND;
	else
	{
	  my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
	  goto error;
	}
4801
      }
4802 4803
      res= result;
      switch (result)
4804 4805
      {
      case SP_OK:
4806
	send_ok(thd);
4807 4808
	break;
      case SP_KEY_NOT_FOUND:
4809 4810
	if (lex->drop_if_exists)
	{
4811
	  push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
4812
			      ER_SP_DOES_NOT_EXIST, ER(ER_SP_DOES_NOT_EXIST),
4813
			      SP_COM_STRING(lex), lex->spname->m_name.str);
4814
	  res= FALSE;
4815 4816 4817
	  send_ok(thd);
	  break;
	}
4818 4819
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4820 4821
	goto error;
      default:
4822 4823
	my_error(ER_SP_DROP_FAILED, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4824
	goto error;
4825
      }
4826
      break;
4827
    }
4828 4829
  case SQLCOM_SHOW_CREATE_PROC:
    {
4830
      if (lex->spname->m_name.length > NAME_LEN)
4831
      {
4832
	my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str);
4833 4834
	goto error;
      }
4835
      if (sp_show_create_procedure(thd, lex->spname) != SP_OK)
4836
      {			/* We don't distinguish between errors for now */
4837 4838
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
4839 4840 4841 4842 4843 4844
	goto error;
      }
      break;
    }
  case SQLCOM_SHOW_CREATE_FUNC:
    {
4845
      if (lex->spname->m_name.length > NAME_LEN)
4846
      {
4847
	my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str);
4848 4849
	goto error;
      }
4850
      if (sp_show_create_function(thd, lex->spname) != SP_OK)
4851
      {			/* We don't distinguish between errors for now */
4852 4853
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
4854 4855 4856 4857
	goto error;
      }
      break;
    }
4858
#ifdef NOT_USED
4859 4860
  case SQLCOM_SHOW_STATUS_PROC:
    {
4861
      res= sp_show_status_procedure(thd, (lex->wild ?
4862 4863 4864 4865 4866
					  lex->wild->ptr() : NullS));
      break;
    }
  case SQLCOM_SHOW_STATUS_FUNC:
    {
4867
      res= sp_show_status_function(thd, (lex->wild ? 
4868 4869 4870
					 lex->wild->ptr() : NullS));
      break;
    }
4871
#endif
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4872 4873 4874 4875 4876 4877 4878 4879 4880 4881 4882 4883
#ifndef DBUG_OFF
  case SQLCOM_SHOW_PROC_CODE:
  case SQLCOM_SHOW_FUNC_CODE:
    {
      sp_head *sp;

      if (lex->spname->m_name.length > NAME_LEN)
      {
	my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str);
	goto error;
      }
      if (lex->sql_command == SQLCOM_SHOW_PROC_CODE)
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4884 4885
        sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname,
                            &thd->sp_proc_cache, FALSE);
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pem@mysql.com committed
4886
      else
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4887 4888
        sp= sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname,
                            &thd->sp_func_cache, FALSE);
4889
      if (!sp || sp->show_routine_code(thd))
4890 4891
      {
        /* We don't distinguish between errors for now */
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pem@mysql.com committed
4892 4893 4894 4895 4896 4897 4898
        my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
        goto error;
      }
      break;
    }
#endif // ifndef DBUG_OFF
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VIEW  
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4899 4900
  case SQLCOM_CREATE_VIEW:
    {
4901 4902 4903
      if (end_active_trans(thd))
        goto error;

4904
      res= mysql_create_view(thd, first_table, thd->lex->create_view_mode);
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VIEW  
bell@sanja.is.com.ua committed
4905 4906 4907 4908
      break;
    }
  case SQLCOM_DROP_VIEW:
    {
4909 4910 4911
      if (check_table_access(thd, DROP_ACL, all_tables, 0) ||
          end_active_trans(thd))
        goto error;
4912 4913
      /* Conditionally writes to binlog. */
      res= mysql_drop_view(thd, first_table, thd->lex->drop_mode);
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4914 4915
      break;
    }
4916 4917
  case SQLCOM_CREATE_TRIGGER:
  {
4918 4919 4920
    if (end_active_trans(thd))
      goto error;

4921
    /* Conditionally writes to binlog. */
4922 4923 4924
    res= mysql_create_or_drop_trigger(thd, all_tables, 1);

    /* We don't care about trigger body after this point */
4925 4926 4927 4928 4929 4930
    delete lex->sphead;
    lex->sphead= 0;
    break;
  }
  case SQLCOM_DROP_TRIGGER:
  {
4931 4932 4933
    if (end_active_trans(thd))
      goto error;

4934
    /* Conditionally writes to binlog. */
4935 4936 4937
    res= mysql_create_or_drop_trigger(thd, all_tables, 0);
    break;
  }
4938
  case SQLCOM_XA_START:
4939 4940
    if (thd->transaction.xid_state.xa_state == XA_IDLE &&
        thd->lex->xa_opt == XA_RESUME)
4941
    {
4942
      if (! thd->transaction.xid_state.xid.eq(thd->lex->xid))
4943 4944 4945 4946
      {
        my_error(ER_XAER_NOTA, MYF(0));
        break;
      }
4947
      thd->transaction.xid_state.xa_state=XA_ACTIVE;
4948 4949 4950
      send_ok(thd);
      break;
    }
serg@serg.mylan's avatar
serg@serg.mylan committed
4951
    if (thd->lex->xa_opt != XA_NONE)
4952 4953 4954 4955
    { // JOIN is not supported yet. TODO
      my_error(ER_XAER_INVAL, MYF(0));
      break;
    }
4956
    if (thd->transaction.xid_state.xa_state != XA_NOTR)
4957
    {
4958
      my_error(ER_XAER_RMFAIL, MYF(0),
4959
               xa_state_names[thd->transaction.xid_state.xa_state]);
4960 4961 4962 4963 4964 4965 4966
      break;
    }
    if (thd->active_transaction() || thd->locked_tables)
    {
      my_error(ER_XAER_OUTSIDE, MYF(0));
      break;
    }
4967 4968 4969 4970 4971 4972 4973 4974 4975
    if (xid_cache_search(thd->lex->xid))
    {
      my_error(ER_XAER_DUPID, MYF(0));
      break;
    }
    DBUG_ASSERT(thd->transaction.xid_state.xid.is_null());
    thd->transaction.xid_state.xa_state=XA_ACTIVE;
    thd->transaction.xid_state.xid.set(thd->lex->xid);
    xid_cache_insert(&thd->transaction.xid_state);
4976 4977
    thd->options= ((thd->options & ~(OPTION_STATUS_NO_TRANS_UPDATE |
                                     OPTION_KEEP_LOG)) |
4978 4979 4980 4981 4982 4983 4984 4985 4986 4987 4988
                   OPTION_BEGIN);
    thd->server_status|= SERVER_STATUS_IN_TRANS;
    send_ok(thd);
    break;
  case SQLCOM_XA_END:
    /* fake it */
    if (thd->lex->xa_opt != XA_NONE)
    { // SUSPEND and FOR MIGRATE are not supported yet. TODO
      my_error(ER_XAER_INVAL, MYF(0));
      break;
    }
4989
    if (thd->transaction.xid_state.xa_state != XA_ACTIVE)
4990
    {
4991
      my_error(ER_XAER_RMFAIL, MYF(0),
4992
               xa_state_names[thd->transaction.xid_state.xa_state]);
4993 4994
      break;
    }
4995
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4996 4997 4998 4999
    {
      my_error(ER_XAER_NOTA, MYF(0));
      break;
    }
5000
    thd->transaction.xid_state.xa_state=XA_IDLE;
5001 5002 5003
    send_ok(thd);
    break;
  case SQLCOM_XA_PREPARE:
5004
    if (thd->transaction.xid_state.xa_state != XA_IDLE)
5005
    {
5006
      my_error(ER_XAER_RMFAIL, MYF(0),
5007
               xa_state_names[thd->transaction.xid_state.xa_state]);
5008 5009
      break;
    }
5010
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
5011 5012 5013 5014 5015 5016 5017
    {
      my_error(ER_XAER_NOTA, MYF(0));
      break;
    }
    if (ha_prepare(thd))
    {
      my_error(ER_XA_RBROLLBACK, MYF(0));
5018 5019
      xid_cache_delete(&thd->transaction.xid_state);
      thd->transaction.xid_state.xa_state=XA_NOTR;
5020 5021
      break;
    }
5022
    thd->transaction.xid_state.xa_state=XA_PREPARED;
5023 5024 5025
    send_ok(thd);
    break;
  case SQLCOM_XA_COMMIT:
5026
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
5027
    {
5028 5029
      XID_STATE *xs=xid_cache_search(thd->lex->xid);
      if (!xs || xs->in_thd)
5030
        my_error(ER_XAER_NOTA, MYF(0));
serg@serg.mylan's avatar
serg@serg.mylan committed
5031
      else
5032 5033 5034
      {
        ha_commit_or_rollback_by_xid(thd->lex->xid, 1);
        xid_cache_delete(xs);
serg@serg.mylan's avatar
serg@serg.mylan committed
5035
        send_ok(thd);
5036
      }
5037 5038
      break;
    }
5039
    if (thd->transaction.xid_state.xa_state == XA_IDLE &&
monty@mysql.com's avatar
monty@mysql.com committed
5040
        thd->lex->xa_opt == XA_ONE_PHASE)
5041
    {
5042 5043 5044
      int r;
      if ((r= ha_commit(thd)))
        my_error(r == 1 ? ER_XA_RBROLLBACK : ER_XAER_RMERR, MYF(0));
5045 5046 5047
      else
        send_ok(thd);
    }
5048
    else if (thd->transaction.xid_state.xa_state == XA_PREPARED &&
monty@mysql.com's avatar
monty@mysql.com committed
5049
             thd->lex->xa_opt == XA_NONE)
5050
    {
5051 5052 5053
      if (wait_if_global_read_lock(thd, 0, 0))
      {
        ha_rollback(thd);
5054
        my_error(ER_XAER_RMERR, MYF(0));
5055
      }
5056
      else
5057 5058 5059 5060 5061 5062 5063
      {
        if (ha_commit_one_phase(thd, 1))
          my_error(ER_XAER_RMERR, MYF(0));
        else
          send_ok(thd);
        start_waiting_global_read_lock(thd);
      }
5064 5065 5066
    }
    else
    {
5067
      my_error(ER_XAER_RMFAIL, MYF(0),
5068
               xa_state_names[thd->transaction.xid_state.xa_state]);
5069 5070
      break;
    }
5071 5072
    thd->options&= ~(OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE |
                     OPTION_KEEP_LOG);
5073
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
5074 5075
    xid_cache_delete(&thd->transaction.xid_state);
    thd->transaction.xid_state.xa_state=XA_NOTR;
5076 5077
    break;
  case SQLCOM_XA_ROLLBACK:
5078
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
5079
    {
5080 5081
      XID_STATE *xs=xid_cache_search(thd->lex->xid);
      if (!xs || xs->in_thd)
5082
        my_error(ER_XAER_NOTA, MYF(0));
serg@serg.mylan's avatar
serg@serg.mylan committed
5083
      else
5084 5085 5086
      {
        ha_commit_or_rollback_by_xid(thd->lex->xid, 0);
        xid_cache_delete(xs);
serg@serg.mylan's avatar
serg@serg.mylan committed
5087
        send_ok(thd);
5088
      }
5089 5090
      break;
    }
5091 5092
    if (thd->transaction.xid_state.xa_state != XA_IDLE &&
        thd->transaction.xid_state.xa_state != XA_PREPARED)
5093
    {
5094
      my_error(ER_XAER_RMFAIL, MYF(0),
5095
               xa_state_names[thd->transaction.xid_state.xa_state]);
5096 5097 5098 5099 5100 5101
      break;
    }
    if (ha_rollback(thd))
      my_error(ER_XAER_RMERR, MYF(0));
    else
      send_ok(thd);
5102 5103
    thd->options&= ~(OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE |
                     OPTION_KEEP_LOG);
5104
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
5105 5106
    xid_cache_delete(&thd->transaction.xid_state);
    thd->transaction.xid_state.xa_state=XA_NOTR;
5107 5108
    break;
  case SQLCOM_XA_RECOVER:
5109
    res= mysql_xa_recover(thd);
5110
    break;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
5111 5112 5113 5114 5115 5116 5117 5118 5119 5120 5121 5122 5123 5124 5125 5126 5127 5128 5129 5130 5131 5132 5133 5134
  case SQLCOM_ALTER_TABLESPACE:
    if (check_access(thd, ALTER_ACL, thd->db, 0, 1, 0, thd->db ? is_schema_db(thd->db) : 0))
      break;
    if (!(res= mysql_alter_tablespace(thd, lex->alter_tablespace_info)))
      send_ok(thd);
    break;
  case SQLCOM_INSTALL_PLUGIN:
    if (! (res= mysql_install_plugin(thd, &thd->lex->comment,
                                     &thd->lex->ident)))
      send_ok(thd);
    break;
  case SQLCOM_UNINSTALL_PLUGIN:
    if (! (res= mysql_uninstall_plugin(thd, &thd->lex->comment)))
      send_ok(thd);
    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;
  }
5135
  default:
5136
#ifndef EMBEDDED_LIBRARY
5137
    DBUG_ASSERT(0);                             /* Impossible */
5138
#endif
5139
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5140 5141
    break;
  }
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
5142 5143

end:
monty@mysql.com's avatar
monty@mysql.com committed
5144
  thd->proc_info="query end";
5145 5146

  /*
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
5147
    Binlog-related cleanup:
5148 5149 5150 5151 5152 5153 5154 5155 5156 5157 5158
    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);

5159
  /*
5160 5161
    The return value for ROW_COUNT() is "implementation dependent" if the
    statement is not DELETE, INSERT or UPDATE, but -1 is what JDBC and ODBC
5162 5163 5164 5165
    wants. We also keep the last value in case of SQLCOM_CALL or
    SQLCOM_EXECUTE.
  */
  if (!(sql_command_flags[lex->sql_command] & CF_HAS_ROW_COUNT))
5166
    thd->row_count_func= -1;
5167

5168
  goto finish;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5169 5170

error:
5171 5172
  res= TRUE;

5173
finish:
5174 5175 5176 5177 5178 5179 5180 5181 5182
  if (need_start_waiting)
  {
    /*
      Release the protection against the global read lock and wake
      everyone, who might want to set a global read lock.
    */
    start_waiting_global_read_lock(thd);
  }
  DBUG_RETURN(res || thd->net.report_error);
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bk@work.mysql.com committed
5183 5184 5185
}


5186 5187 5188 5189 5190 5191 5192 5193 5194 5195 5196 5197 5198 5199 5200 5201 5202 5203 5204 5205 5206 5207 5208
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);
  }
  if (!(res= open_and_lock_tables(thd, all_tables)))
  {
    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()))
5209
        return 1;                               /* purecov: inspected */
5210 5211 5212 5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224 5225 5226 5227
      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);
        thd->lex->unit.print(&str);
        str.append('\0');
        push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
                     ER_YES, str.ptr());
      }
      result->send_eof();
      delete result;
    }
    else
    {
      if (!result && !(result= new select_send()))
5228
        return 1;                               /* purecov: inspected */
5229 5230 5231 5232 5233 5234 5235 5236 5237 5238
      query_cache_store_query(thd, all_tables);
      res= handle_select(thd, lex, result, 0);
      if (result != lex->result)
        delete result;
    }
  }
  return res;
}


bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5239
/*
5240
  Check grants for commands which work only with one table.
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5241

5242
  SYNOPSIS
5243
    check_single_table_access()
monty@mysql.com's avatar
monty@mysql.com committed
5244
    thd			Thread handler
5245
    privilege		requested privilege
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
5246
    all_tables		global table list of query
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5247 5248 5249

  RETURN
    0 - OK
monty@mysql.com's avatar
monty@mysql.com committed
5250
    1 - access denied, error is sent to client
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5251 5252
*/

5253 5254
bool check_single_table_access(THD *thd, ulong privilege, 
                               TABLE_LIST *all_tables)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5255
{
5256 5257 5258 5259 5260 5261
  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;

5262 5263 5264 5265 5266 5267 5268 5269
  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,
5270 5271
		   &all_tables->grant.privilege, 0, 0,
                   test(all_tables->schema_table)))
5272
    goto deny;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5273

5274
  /* Show only 1 table for check_grant */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
5275
  if (grant_option && check_grant(thd, privilege, all_tables, 0, 1, 0))
5276 5277 5278
    goto deny;

  thd->security_ctx= backup_ctx;
5279 5280 5281 5282 5283 5284 5285 5286 5287 5288 5289 5290 5291 5292 5293 5294 5295 5296 5297 5298 5299 5300 5301 5302 5303 5304
  return 0;

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

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

  SYNOPSIS
    check_one_table_access()
    thd			Thread handler
    privilege		requested privilege
    all_tables		global table list of query

  RETURN
    0 - OK
    1 - access denied, error is sent to client
*/

bool check_one_table_access(THD *thd, ulong privilege, TABLE_LIST *all_tables)
{
  if (check_single_table_access (thd,privilege,all_tables))
    return 1;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5305

5306
  /* Check rights on tables of subselects and implictly opened tables */
5307
  TABLE_LIST *subselects_tables, *view= all_tables->view ? all_tables : 0;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
5308
  if ((subselects_tables= all_tables->next_global))
monty@mysql.com's avatar
monty@mysql.com committed
5309
  {
5310 5311 5312 5313 5314 5315 5316 5317 5318 5319 5320 5321
    /*
      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)
    {
      if (check_single_table_access (thd, privilege, subselects_tables))
        return 1;
      subselects_tables= subselects_tables->next_global;
    }
    if (subselects_tables &&
        (check_table_access(thd, SELECT_ACL, subselects_tables, 0)))
5322
      return 1;
monty@mysql.com's avatar
monty@mysql.com committed
5323 5324
  }
  return 0;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5325 5326 5327
}


bk@work.mysql.com's avatar
bk@work.mysql.com committed
5328
/****************************************************************************
5329
  Get the user (global) and database privileges for all used tables
5330 5331 5332 5333 5334 5335 5336 5337 5338 5339 5340 5341 5342

  NOTES
    The idea of EXTRA_ACL is that one will be granted access to the table if
    one has the asked privilege on any column combination of the table; For
    example to be able to check a table one needs to have SELECT privilege on
    any column of the table.

  RETURN
    0  ok
    1  If we can't get the privileges and we don't use table/column grants.

    save_priv	In this we store global and db level grants for the table
		Note that we don't store db level grants if the global grants
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
5343 5344
                is enough to satisfy the request and the global grants contains
                a SELECT grant.
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5345 5346 5347
****************************************************************************/

bool
5348
check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
5349
	     bool dont_check_global_grants, bool no_errors, bool schema_db)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5350
{
5351
  Security_context *sctx= thd->security_ctx;
5352 5353
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  ulong db_access;
5354
  bool  db_is_pattern= test(want_access & GRANT_ACL);
5355 5356
#endif
  ulong dummy;
5357 5358
  DBUG_ENTER("check_access");
  DBUG_PRINT("enter",("db: %s  want_access: %lu  master_access: %lu",
5359
                      db ? db : "", want_access, sctx->master_access));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5360 5361 5362 5363 5364
  if (save_priv)
    *save_priv=0;
  else
    save_priv= &dummy;

5365
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5366
  {
5367
    DBUG_PRINT("error",("No database"));
5368
    if (!no_errors)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5369 5370
      my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR),
                 MYF(0));                       /* purecov: tested */
5371
    DBUG_RETURN(TRUE);				/* purecov: tested */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5372 5373
  }

5374 5375 5376 5377 5378
  if (schema_db)
  {
    if (want_access & ~(SELECT_ACL | EXTRA_ACL))
    {
      if (!no_errors)
5379 5380
      {
        const char *db_name= db ? db : thd->db;
5381
        my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
5382 5383
                 sctx->priv_user, sctx->priv_host, db_name);
      }
5384 5385 5386 5387 5388 5389 5390 5391 5392
      DBUG_RETURN(TRUE);
    }
    else
    {
      *save_priv= SELECT_ACL;
      DBUG_RETURN(FALSE);
    }
  }

monty@mysql.com's avatar
monty@mysql.com committed
5393 5394 5395
#ifdef NO_EMBEDDED_ACCESS_CHECKS
  DBUG_RETURN(0);
#else
5396
  if ((sctx->master_access & want_access) == want_access)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5397
  {
5398 5399 5400 5401 5402
    /*
      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
      UPDATE t1 SET a=1 WHERE b > 0
    */
5403 5404
    db_access= sctx->db_access;
    if (!(sctx->master_access & SELECT_ACL) &&
5405
	(db && (!thd->db || db_is_pattern || strcmp(db,thd->db))))
5406 5407 5408
      db_access=acl_get(sctx->host, sctx->ip, sctx->priv_user, db,
                        db_is_pattern);
    *save_priv=sctx->master_access | db_access;
5409
    DBUG_RETURN(FALSE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5410
  }
5411
  if (((want_access & ~sctx->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
5412
      ! db && dont_check_global_grants)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5413
  {						// We can never grant this
5414
    DBUG_PRINT("error",("No possible access"));
5415
    if (!no_errors)
5416
      my_error(ER_ACCESS_DENIED_ERROR, MYF(0),
5417 5418
               sctx->priv_user,
               sctx->priv_host,
5419 5420 5421
               (thd->password ?
                ER(ER_YES) :
                ER(ER_NO)));                    /* purecov: tested */
5422
    DBUG_RETURN(TRUE);				/* purecov: tested */
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5423 5424 5425
  }

  if (db == any_db)
5426
    DBUG_RETURN(FALSE);				// Allow select on anything
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5427

5428
  if (db && (!thd->db || db_is_pattern || strcmp(db,thd->db)))
5429 5430
    db_access= acl_get(sctx->host, sctx->ip, sctx->priv_user, db,
                       db_is_pattern);
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bk@work.mysql.com committed
5431
  else
5432
    db_access= sctx->db_access;
5433
  DBUG_PRINT("info",("db_access: %lu", db_access));
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monty@mysql.com committed
5434
  /* Remove SHOW attribute and access rights we already have */
5435
  want_access &= ~(sctx->master_access | EXTRA_ACL);
5436 5437
  DBUG_PRINT("info",("db_access: %lu  want_access: %lu",
                     db_access, want_access));
5438
  db_access= ((*save_priv=(db_access | sctx->master_access)) & want_access);
5439 5440

  /* grant_option is set if there exists a single table or column grant */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5441
  if (db_access == want_access ||
5442
      (grant_option && !dont_check_global_grants &&
5443
       !(want_access & ~(db_access | TABLE_ACLS | PROC_ACLS))))
5444
    DBUG_RETURN(FALSE);				/* Ok */
5445 5446

  DBUG_PRINT("error",("Access denied"));
5447
  if (!no_errors)
5448
    my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
5449
             sctx->priv_user, sctx->priv_host,
5450 5451 5452
             (db ? db : (thd->db ?
                         thd->db :
                         "unknown")));          /* purecov: tested */
5453
  DBUG_RETURN(TRUE);				/* purecov: tested */
monty@mysql.com's avatar
monty@mysql.com committed
5454
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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bk@work.mysql.com committed
5455 5456 5457
}


5458 5459 5460 5461 5462 5463 5464 5465 5466
/*
  check for global access and give descriptive error message if it fails

  SYNOPSIS
    check_global_access()
    thd			Thread handler
    want_access		Use should have any of these global rights

  WARNING
5467
    One gets access right if one has ANY of the rights in want_access
5468 5469 5470 5471 5472 5473 5474 5475
    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.

  RETURN
    0	ok
    1	Access denied.  In this case an error is sent to the client
*/
5476 5477

bool check_global_access(THD *thd, ulong want_access)
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monty@tik.mysql.fi committed
5478
{
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5479 5480 5481
#ifdef NO_EMBEDDED_ACCESS_CHECKS
  return 0;
#else
5482
  char command[128];
5483
  if ((thd->security_ctx->master_access & want_access))
5484 5485
    return 0;
  get_privilege_desc(command, sizeof(command), want_access);
5486
  my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), command);
5487
  return 1;
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5488
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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monty@tik.mysql.fi committed
5489 5490 5491
}


bk@work.mysql.com's avatar
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5492
/*
5493 5494 5495 5496 5497 5498 5499 5500 5501 5502 5503 5504 5505 5506 5507 5508 5509 5510 5511 5512
  Check the privilege for all used tables.

  SYNOPSYS
    check_table_access()
      thd          Thread context
      want_access  Privileges requested
      tables       List of tables to be checked
      no_errors    FALSE/TRUE - report/don't report error to
                   the client (using my_error() call).

  NOTES
    Table privileges are cached in the table list for GRANT checking.
    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).

  RETURN VALUE
    FALSE - OK
    TRUE  - Access denied
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5513 5514
*/

5515
bool
5516
check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
5517
		   bool no_errors)
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5518
{
5519 5520
  uint found=0;
  ulong found_access=0;
5521 5522
  TABLE_LIST *org_tables= tables;
  TABLE_LIST *first_not_own_table= thd->lex->first_not_own_table();
5523
  Security_context *sctx= thd->security_ctx, *backup_ctx= thd->security_ctx;
5524
  /*
5525 5526 5527
    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.
5528
  */
5529
  for (; tables != first_not_own_table; tables= tables->next_global)
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5530
  {
5531 5532 5533 5534 5535
    if (tables->security_ctx)
      sctx= tables->security_ctx;
    else
      sctx= backup_ctx;

5536
    if (tables->schema_table && 
5537
        (want_access & ~(SELECT_ACL | EXTRA_ACL | FILE_ACL)))
5538 5539 5540
    {
      if (!no_errors)
        my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
5541
                 sctx->priv_user, sctx->priv_host,
5542 5543 5544
                 information_schema_name.str);
      return TRUE;
    }
5545 5546 5547 5548 5549
    /*
       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);
5550
    if (tables->derived || tables->schema_table ||
5551
        (tables->table && (int)tables->table->s->tmp_table) ||
5552 5553
        my_tz_check_n_skip_implicit_tables(&tables,
                                           thd->lex->time_zone_tables_used))
Sinisa@sinisa.nasamreza.org's avatar
Sinisa@sinisa.nasamreza.org committed
5554
      continue;
5555 5556
    thd->security_ctx= sctx;
    if ((sctx->master_access & want_access) ==
5557
        (want_access & ~EXTRA_ACL) &&
5558
	thd->db)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5559
      tables->grant.privilege= want_access;
5560
    else if (tables->db && thd->db && strcmp(tables->db, thd->db) == 0)
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bk@work.mysql.com committed
5561 5562 5563 5564 5565
    {
      if (found && !grant_option)		// db already checked
	tables->grant.privilege=found_access;
      else
      {
5566
	if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
5567
			 0, no_errors, test(tables->schema_table)))
5568
	  goto deny;                            // Access denied
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bk@work.mysql.com committed
5569
	found_access=tables->grant.privilege;
5570
	found=1;
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bk@work.mysql.com committed
5571 5572
      }
    }
5573
    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
5574
			  0, no_errors, test(tables->schema_table)))
5575
      goto deny;
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bk@work.mysql.com committed
5576
  }
5577
  thd->security_ctx= backup_ctx;
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bk@work.mysql.com committed
5578
  if (grant_option)
5579
    return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
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bell@sanja.is.com.ua committed
5580
		       test(want_access & EXTRA_ACL), UINT_MAX, no_errors);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5581
  return FALSE;
5582 5583 5584
deny:
  thd->security_ctx= backup_ctx;
  return TRUE;
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5585 5586
}

5587

5588
bool
5589 5590
check_routine_access(THD *thd, ulong want_access,char *db, char *name,
		     bool is_proc, bool no_errors)
5591 5592 5593 5594 5595
{
  TABLE_LIST tables[1];
  
  bzero((char *)tables, sizeof(TABLE_LIST));
  tables->db= db;
5596
  tables->table_name= tables->alias= name;
5597
  
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5598 5599 5600 5601 5602 5603 5604
  /*
    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).
  */
  if ((thd->security_ctx->master_access & want_access) == want_access)
5605 5606
    tables->grant.privilege= want_access;
  else if (check_access(thd,want_access,db,&tables->grant.privilege,
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monty@mysql.com committed
5607
			0, no_errors, 0))
5608 5609
    return TRUE;
  
5610
#ifndef NO_EMBEDDED_ACCESS_CHECKS
5611
  if (grant_option)
5612
    return check_grant_routine(thd, want_access, tables, is_proc, no_errors);
5613
#endif
5614 5615 5616 5617

  return FALSE;
}

5618 5619 5620 5621 5622 5623 5624 5625 5626 5627 5628 5629 5630 5631 5632

/*
  Check if the routine has any of the routine privileges

  SYNOPSIS
    check_some_routine_access()
    thd		 Thread handler
    db           Database name
    name         Routine name

  RETURN
    0            ok
    1            error
*/

5633 5634
bool check_some_routine_access(THD *thd, const char *db, const char *name,
                               bool is_proc)
5635 5636
{
  ulong save_priv;
5637
  if (thd->security_ctx->master_access & SHOW_PROC_ACLS)
5638
    return FALSE;
5639 5640 5641 5642 5643
  /*
    There are no routines in information_schema db. So we can safely
    pass zero to last paramter of check_access function
  */
  if (!check_access(thd, SHOW_PROC_ACLS, db, &save_priv, 0, 1, 0) ||
5644 5645
      (save_priv & SHOW_PROC_ACLS))
    return FALSE;
5646
  return check_routine_level_acl(thd, db, name, is_proc);
5647 5648 5649
}


5650 5651 5652 5653 5654 5655 5656 5657 5658 5659 5660 5661 5662 5663 5664 5665 5666 5667 5668 5669 5670 5671 5672 5673 5674
/*
  Check if the given table has any of the asked privileges

  SYNOPSIS
    check_some_access()
    thd		 Thread handler
    want_access	 Bitmap of possible privileges to check for

  RETURN
    0  ok
    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,
5675 5676
                        &table->grant.privilege, 0, 1,
                        test(table->schema_table)) &&
5677 5678 5679 5680 5681 5682 5683 5684 5685
          !grant_option || !check_grant(thd, access, table, 0, 1, 1))
        DBUG_RETURN(0);
    }
  }
  DBUG_PRINT("exit",("no matching access rights"));
  DBUG_RETURN(1);
}


5686 5687
bool check_merge_table_access(THD *thd, char *db,
			      TABLE_LIST *table_list)
5688 5689 5690 5691
{
  int error=0;
  if (table_list)
  {
5692
    /* Check that all tables use the current database */
5693
    TABLE_LIST *tmp;
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VIEW  
bell@sanja.is.com.ua committed
5694
    for (tmp= table_list; tmp; tmp= tmp->next_local)
5695 5696 5697 5698
    {
      if (!tmp->db || !tmp->db[0])
	tmp->db=db;
    }
5699
    error=check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
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hf@deer.(none) committed
5700
			     table_list,0);
5701 5702 5703 5704
  }
  return error;
}

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hf@deer.(none) committed
5705

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5706 5707 5708 5709 5710 5711 5712 5713 5714 5715
/****************************************************************************
	Check stack size; Send error if there isn't enough stack to continue
****************************************************************************/

#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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5716 5717 5718 5719
#ifndef DBUG_OFF
long max_stack_used;
#endif

5720
#ifndef EMBEDDED_LIBRARY
5721 5722 5723 5724 5725 5726 5727 5728
/*
  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.
 */
bool check_stack_overrun(THD *thd, long margin,
			 char *buf __attribute__((unused)))
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bk@work.mysql.com committed
5729 5730
{
  long stack_used;
5731
  DBUG_ASSERT(thd == current_thd);
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5732
  if ((stack_used=used_stack(thd->thread_stack,(char*) &stack_used)) >=
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monty@mysql.com committed
5733
      (long) (thread_stack - margin))
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bk@work.mysql.com committed
5734
  {
5735 5736 5737
    sprintf(errbuff[0],ER(ER_STACK_OVERRUN_NEED_MORE),
            stack_used,thread_stack,margin);
    my_message(ER_STACK_OVERRUN_NEED_MORE,errbuff[0],MYF(0));
5738
    thd->fatal_error();
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5739 5740
    return 1;
  }
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5741 5742 5743
#ifndef DBUG_OFF
  max_stack_used= max(max_stack_used, stack_used);
#endif
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bk@work.mysql.com committed
5744 5745
  return 0;
}
5746
#endif /* EMBEDDED_LIBRARY */
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5747 5748 5749 5750

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

5751
bool my_yyoverflow(short **yyss, YYSTYPE **yyvs, ulong *yystacksize)
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bk@work.mysql.com committed
5752
{
5753
  LEX	*lex= current_thd->lex;
5754
  ulong old_info=0;
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5755 5756 5757 5758 5759 5760 5761 5762 5763 5764 5765 5766 5767 5768 5769 5770 5771 5772 5773 5774 5775 5776 5777 5778 5779 5780
  if ((uint) *yystacksize >= MY_YACC_MAX)
    return 1;
  if (!lex->yacc_yyvs)
    old_info= *yystacksize;
  *yystacksize= set_zone((*yystacksize)*2,MY_YACC_INIT,MY_YACC_MAX);
  if (!(lex->yacc_yyvs= (char*)
	my_realloc((gptr) lex->yacc_yyvs,
		   *yystacksize*sizeof(**yyvs),
		   MYF(MY_ALLOW_ZERO_PTR | MY_FREE_ON_ERROR))) ||
      !(lex->yacc_yyss= (char*)
	my_realloc((gptr) lex->yacc_yyss,
		   *yystacksize*sizeof(**yyss),
		   MYF(MY_ALLOW_ZERO_PTR | MY_FREE_ON_ERROR))))
    return 1;
  if (old_info)
  {						// Copy old info from stack
    memcpy(lex->yacc_yyss, (gptr) *yyss, old_info*sizeof(**yyss));
    memcpy(lex->yacc_yyvs, (gptr) *yyvs, old_info*sizeof(**yyvs));
  }
  *yyss=(short*) lex->yacc_yyss;
  *yyvs=(YYSTYPE*) lex->yacc_yyvs;
  return 0;
}


/****************************************************************************
5781
  Initialize global thd variables needed for query
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5782 5783
****************************************************************************/

5784
void
5785
mysql_init_query(THD *thd, uchar *buf, uint length)
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bk@work.mysql.com committed
5786 5787
{
  DBUG_ENTER("mysql_init_query");
5788
  lex_start(thd, buf, length);
5789 5790 5791 5792 5793 5794 5795 5796 5797 5798 5799
  mysql_reset_thd_for_next_command(thd);
  DBUG_VOID_RETURN;
}


/*
 Reset THD part responsible for command processing state.

 DESCRIPTION
   This needs to be called before execution of every statement
   (prepared or conventional).
5800
   It is not called by substatements of routines.
5801 5802 5803 5804 5805 5806 5807 5808 5809 5810

 TODO
   Make it a method of THD and align its name with the rest of
   reset/end/start/init methods.
   Call it after we use THD for queries, not before.
*/

void mysql_reset_thd_for_next_command(THD *thd)
{
  DBUG_ENTER("mysql_reset_thd_for_next_command");
5811
  DBUG_ASSERT(!thd->spcont); /* not for substatements of routines */
5812
  thd->free_list= 0;
5813
  thd->select_number= 1;
5814 5815 5816 5817
  /*
    Those two lines below are theoretically unneeded as
    THD::cleanup_after_query() should take care of this already.
  */
5818
  thd->auto_inc_intervals_in_cur_stmt_for_binlog.empty();
5819 5820 5821
  thd->stmt_depends_on_first_successful_insert_id_in_prev_stmt= 0;

  thd->query_start_used= 0;
5822
  thd->is_fatal_error= thd->time_zone_used= 0;
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monty@mysql.com committed
5823
  thd->server_status&= ~ (SERVER_MORE_RESULTS_EXISTS | 
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5824 5825
                          SERVER_QUERY_NO_INDEX_USED |
                          SERVER_QUERY_NO_GOOD_INDEX_USED);
5826 5827 5828 5829 5830 5831 5832 5833
  /*
    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.
  */
  if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)))
    thd->options&= ~(OPTION_STATUS_NO_TRANS_UPDATE | OPTION_KEEP_LOG);

5834
  DBUG_ASSERT(thd->security_ctx== &thd->main_security_ctx);
5835
  thd->tmp_table_used= 0;
5836 5837
  if (!thd->in_sub_stmt)
  {
5838
    if (opt_bin_log)
5839
    {
5840
      reset_dynamic(&thd->user_var_events);
5841 5842
      thd->user_var_events_alloc= thd->mem_root;
    }
5843
    thd->clear_error();
5844 5845 5846 5847
    thd->total_warn_count=0;			// Warnings for this query
    thd->rand_used= 0;
    thd->sent_row_count= thd->examined_row_count= 0;
  }
5848 5849 5850 5851
  /*
    Because we come here only for start of top-statements, binlog format is
    constant inside a complex statement (using stored functions) etc.
  */
5852 5853
  thd->reset_current_stmt_binlog_row_based();

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5854 5855 5856
  DBUG_VOID_RETURN;
}

5857

5858 5859 5860
void
mysql_init_select(LEX *lex)
{
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5861
  SELECT_LEX *select_lex= lex->current_select;
5862
  select_lex->init_select();
5863
  lex->wild= 0;
5864 5865
  if (select_lex == &lex->select_lex)
  {
5866
    DBUG_ASSERT(lex->result == 0);
5867 5868
    lex->exchange= 0;
  }
5869 5870
}

5871

5872
bool
5873
mysql_new_select(LEX *lex, bool move_down)
5874
{
5875
  SELECT_LEX *select_lex;
5876
  THD *thd= lex->thd;
5877 5878
  DBUG_ENTER("mysql_new_select");

5879
  if (!(select_lex= new (thd->mem_root) SELECT_LEX()))
5880
    DBUG_RETURN(1);
5881
  select_lex->select_number= ++thd->select_number;
5882
  select_lex->parent_lex= lex; /* Used in init_query. */
5883 5884
  select_lex->init_query();
  select_lex->init_select();
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5885 5886
  lex->nest_level++;
  select_lex->nest_level= lex->nest_level;
5887 5888 5889 5890 5891
  /*
    Don't evaluate this subquery during statement prepare even if
    it's a constant one. The flag is switched off in the end of
    mysql_stmt_prepare.
  */
konstantin@mysql.com's avatar
konstantin@mysql.com committed
5892
  if (thd->stmt_arena->is_stmt_prepare())
5893
    select_lex->uncacheable|= UNCACHEABLE_PREPARE;
5894 5895
  if (move_down)
  {
5896
    SELECT_LEX_UNIT *unit;
5897
    lex->subqueries= TRUE;
5898
    /* first select_lex of subselect or derived table */
5899
    if (!(unit= new (thd->mem_root) SELECT_LEX_UNIT()))
5900
      DBUG_RETURN(1);
5901

5902 5903
    unit->init_query();
    unit->init_select();
5904
    unit->thd= thd;
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bell@sanja.is.com.ua committed
5905
    unit->include_down(lex->current_select);
5906 5907
    unit->link_next= 0;
    unit->link_prev= 0;
5908
    unit->return_to= lex->current_select;
5909
    select_lex->include_down(unit);
5910 5911 5912 5913 5914
    /*
      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;
5915 5916
  }
  else
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5917
  {
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VIEW  
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5918 5919
    if (lex->current_select->order_list.first && !lex->current_select->braces)
    {
5920
      my_error(ER_WRONG_USAGE, MYF(0), "UNION", "ORDER BY");
5921
      DBUG_RETURN(1);
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VIEW  
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5922
    }
5923
    select_lex->include_neighbour(lex->current_select);
5924 5925 5926 5927 5928
    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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bell@sanja.is.com.ua committed
5929
  }
peter@mysql.com's avatar
peter@mysql.com committed
5930

5931
  select_lex->master_unit()->global_parameters= select_lex;
5932
  select_lex->include_global((st_select_lex_node**)&lex->all_selects_list);
5933
  lex->current_select= select_lex;
5934 5935 5936 5937 5938
  /*
    in subquery is SELECT query and we allow resolution of names in SELECT
    list
  */
  select_lex->context.resolve_in_select_list= TRUE;
5939
  DBUG_RETURN(0);
5940
}
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bk@work.mysql.com committed
5941

5942 5943 5944 5945 5946 5947 5948 5949 5950 5951 5952 5953 5954 5955 5956
/*
  Create a select to return the same output as 'SELECT @@var_name'.

  SYNOPSIS
    create_select_for_variable()
    var_name		Variable name

  DESCRIPTION
    Used for SHOW COUNT(*) [ WARNINGS | ERROR]

    This will crash with a core dump if the variable doesn't exists
*/

void create_select_for_variable(const char *var_name)
{
5957
  THD *thd;
5958
  LEX *lex;
5959
  LEX_STRING tmp, null_lex_string;
5960 5961
  Item *var;
  char buff[MAX_SYS_VAR_LENGTH*2+4+8], *end;
5962
  DBUG_ENTER("create_select_for_variable");
5963 5964

  thd= current_thd;
pem@mysql.telia.com's avatar
pem@mysql.telia.com committed
5965
  lex= thd->lex;
5966 5967 5968 5969
  mysql_init_select(lex);
  lex->sql_command= SQLCOM_SELECT;
  tmp.str= (char*) var_name;
  tmp.length=strlen(var_name);
5970
  bzero((char*) &null_lex_string.str, sizeof(null_lex_string));
5971 5972 5973 5974
  /*
    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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monty@mysql.com committed
5975 5976 5977 5978 5979 5980
  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);
  }
5981 5982 5983
  DBUG_VOID_RETURN;
}

5984

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monty@hundin.mysql.fi committed
5985 5986
void mysql_init_multi_delete(LEX *lex)
{
5987
  lex->sql_command=  SQLCOM_DELETE_MULTI;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5988
  mysql_init_select(lex);
5989 5990
  lex->select_lex.select_limit= 0;
  lex->unit.select_limit_cnt= HA_POS_ERROR;
5991
  lex->select_lex.table_list.save_and_clear(&lex->auxiliary_table_list);
5992
  lex->lock_option= using_update_log ? TL_READ_NO_INSERT : TL_READ;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
5993 5994
  lex->query_tables= 0;
  lex->query_tables_last= &lex->query_tables;
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monty@hundin.mysql.fi committed
5995
}
5996

5997 5998 5999 6000
/*
  When you modify mysql_parse(), you may need to mofify
  mysql_test_parse_for_slave() in this same file.
*/
6001

6002
void mysql_parse(THD *thd, char *inBuf, uint length)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6003 6004
{
  DBUG_ENTER("mysql_parse");
6005 6006 6007

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

6008
  mysql_init_query(thd, (uchar*) inBuf, length);
6009
  if (query_cache_send_result_to_client(thd, inBuf, length) <= 0)
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
6010
  {
6011
    LEX *lex= thd->lex;
6012
    
6013 6014
    sp_cache_flush_obsolete(&thd->sp_proc_cache);
    sp_cache_flush_obsolete(&thd->sp_func_cache);
6015
    
6016
    if (!MYSQLparse((void *)thd) && ! thd->is_fatal_error)
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
6017
    {
hf@deer.(none)'s avatar
hf@deer.(none) committed
6018
#ifndef NO_EMBEDDED_ACCESS_CHECKS
6019
      if (mqh_used && thd->user_connect &&
6020
	  check_mqh(thd, lex->sql_command))
6021 6022 6023 6024
      {
	thd->net.error = 0;
      }
      else
hf@deer.(none)'s avatar
hf@deer.(none) committed
6025
#endif
6026
      {
6027
	if (thd->net.report_error)
6028
	{
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
6029 6030
          delete lex->sphead;
          lex->sphead= NULL;
6031
	}
6032 6033
	else
	{
6034 6035 6036 6037 6038 6039 6040 6041 6042 6043
          /*
            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.
          */
serg@serg.mylan's avatar
serg@serg.mylan committed
6044 6045
          if (lex->found_semicolon &&
              (thd->query_length= (ulong)(lex->found_semicolon - thd->query)))
6046 6047
            thd->query_length--;
          /* Actually execute the query */
6048
	  mysql_execute_command(thd);
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
6049
	  query_cache_end_of_result(thd);
6050
	}
6051
      }
6052
      lex->unit.cleanup();
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monty@hundin.mysql.fi committed
6053 6054
    }
    else
6055
    {
6056
      DBUG_ASSERT(thd->net.report_error);
6057
      DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
6058
			 thd->is_fatal_error));
6059 6060 6061 6062 6063

      /*
        The first thing we do after parse error is freeing sp_head to
        ensure that we have restored original memroot.
      */
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
6064
      if (lex->sphead)
6065
      {
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monty@mysql.com committed
6066
	/* Clean up after failed stored procedure/function */
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
6067 6068 6069
	delete lex->sphead;
	lex->sphead= NULL;
      }
6070 6071
      query_cache_abort(&thd->net);
      lex->unit.cleanup();
6072
    }
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monty@hundin.mysql.fi committed
6073
    thd->proc_info="freeing items";
6074
    thd->end_statement();
6075
    thd->cleanup_after_query();
6076
    DBUG_ASSERT(thd->change_list.is_empty());
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monty@hundin.mysql.fi committed
6077
  }
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bk@work.mysql.com committed
6078 6079 6080 6081
  DBUG_VOID_RETURN;
}


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monty@mysql.com committed
6082
#ifdef HAVE_REPLICATION
6083 6084 6085 6086 6087 6088 6089 6090 6091 6092 6093
/*
  Usable by the replication SQL thread only: just parse a query to know if it
  can be ignored because of replicate-*-table rules.

  RETURN VALUES
    0	cannot be ignored
    1	can be ignored
*/

bool mysql_test_parse_for_slave(THD *thd, char *inBuf, uint length)
{
6094
  LEX *lex= thd->lex;
6095
  bool error= 0;
monty@mysql.com's avatar
monty@mysql.com committed
6096
  DBUG_ENTER("mysql_test_parse_for_slave");
6097

6098
  mysql_init_query(thd, (uchar*) inBuf, length);
6099
  if (!MYSQLparse((void*) thd) && ! thd->is_fatal_error &&
6100
      all_tables_not_ok(thd,(TABLE_LIST*) lex->select_lex.table_list.first))
monty@mysql.com's avatar
monty@mysql.com committed
6101
    error= 1;                  /* Ignore question */
6102
  thd->end_statement();
6103
  thd->cleanup_after_query();
monty@mysql.com's avatar
monty@mysql.com committed
6104
  DBUG_RETURN(error);
6105
}
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monty@mysql.com committed
6106
#endif
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bk@work.mysql.com committed
6107

6108

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monty@mysql.com committed
6109

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6110 6111 6112 6113 6114
/*****************************************************************************
** Store field definition for create
** Return 0 if ok
******************************************************************************/

monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
6115
bool add_field_to_list(THD *thd, char *field_name, enum_field_types type,
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6116
		       char *length, char *decimals,
6117
		       uint type_modifier,
6118 6119
		       Item *default_value, Item *on_update_value,
                       LEX_STRING *comment,
6120 6121
		       char *change,
                       List<String> *interval_list, CHARSET_INFO *cs,
6122
		       uint uint_geom_type)
bk@work.mysql.com's avatar
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6123 6124
{
  register create_field *new_field;
6125
  LEX  *lex= thd->lex;
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6126 6127 6128 6129
  DBUG_ENTER("add_field_to_list");

  if (strlen(field_name) > NAME_LEN)
  {
6130
    my_error(ER_TOO_LONG_IDENT, MYF(0), field_name); /* purecov: inspected */
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6131 6132 6133 6134 6135
    DBUG_RETURN(1);				/* purecov: inspected */
  }
  if (type_modifier & PRI_KEY_FLAG)
  {
    lex->col_list.push_back(new key_part_spec(field_name,0));
6136 6137
    lex->key_list.push_back(new Key(Key::PRIMARY, NullS,
                                    &default_key_create_info,
6138
				    0, lex->col_list));
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6139 6140 6141 6142 6143
    lex->col_list.empty();
  }
  if (type_modifier & (UNIQUE_FLAG | UNIQUE_KEY_FLAG))
  {
    lex->col_list.push_back(new key_part_spec(field_name,0));
6144 6145
    lex->key_list.push_back(new Key(Key::UNIQUE, NullS,
                                    &default_key_create_info, 0,
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bk@work.mysql.com committed
6146 6147 6148 6149
				    lex->col_list));
    lex->col_list.empty();
  }

6150
  if (default_value)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6151
  {
6152
    /* 
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6153 6154
      Default value should be literal => basic constants =>
      no need fix_fields()
6155 6156 6157
      
      We allow only one function as part of default value - 
      NOW() as default for TIMESTAMP type.
6158
    */
6159 6160 6161
    if (default_value->type() == Item::FUNC_ITEM && 
        !(((Item_func*)default_value)->functype() == Item_func::NOW_FUNC &&
         type == FIELD_TYPE_TIMESTAMP))
6162
    {
6163
      my_error(ER_INVALID_DEFAULT, MYF(0), field_name);
6164 6165 6166
      DBUG_RETURN(1);
    }
    else if (default_value->type() == Item::NULL_ITEM)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6167
    {
6168
      default_value= 0;
6169 6170 6171
      if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) ==
	  NOT_NULL_FLAG)
      {
6172
	my_error(ER_INVALID_DEFAULT, MYF(0), field_name);
6173 6174 6175 6176 6177
	DBUG_RETURN(1);
      }
    }
    else if (type_modifier & AUTO_INCREMENT_FLAG)
    {
6178
      my_error(ER_INVALID_DEFAULT, MYF(0), field_name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6179 6180 6181
      DBUG_RETURN(1);
    }
  }
6182 6183 6184

  if (on_update_value && type != FIELD_TYPE_TIMESTAMP)
  {
6185
    my_error(ER_INVALID_ON_UPDATE, MYF(0), field_name);
6186 6187
    DBUG_RETURN(1);
  }
6188

6189 6190 6191 6192 6193 6194
  if (type == FIELD_TYPE_TIMESTAMP && length)
  {
    /* Display widths are no longer supported for TIMSTAMP as of MySQL 4.1.
       In other words, for declarations such as TIMESTAMP(2), TIMESTAMP(4),
       and so on, the display width is ignored.
    */
msvensson@neptunus.(none)'s avatar
msvensson@neptunus.(none) committed
6195
    char buf[32];
6196
    my_snprintf(buf, sizeof(buf), "TIMESTAMP(%s)", length);
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
6197
    WARN_DEPRECATED(thd, "5.2", buf, "'TIMESTAMP'");
6198 6199
  }

6200 6201 6202 6203
  if (!(new_field= new create_field()) ||
      new_field->init(thd, field_name, type, length, decimals, type_modifier,
                      default_value, on_update_value, comment, change,
                      interval_list, cs, uint_geom_type))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6204
    DBUG_RETURN(1);
6205 6206 6207 6208 6209 6210

  lex->create_list.push_back(new_field);
  lex->last_field=new_field;
  DBUG_RETURN(0);
}

6211

bk@work.mysql.com's avatar
bk@work.mysql.com committed
6212 6213 6214 6215
/* Store position for column in ALTER TABLE .. ADD column */

void store_position_for_column(const char *name)
{
6216
  current_thd->lex->last_field->after=my_const_cast(char*) (name);
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bk@work.mysql.com committed
6217 6218 6219
}

bool
6220
add_proc_to_list(THD* thd, Item *item)
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bk@work.mysql.com committed
6221 6222 6223 6224
{
  ORDER *order;
  Item	**item_ptr;

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monty@mashka.mysql.fi committed
6225
  if (!(order = (ORDER *) thd->alloc(sizeof(ORDER)+sizeof(Item*))))
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bk@work.mysql.com committed
6226 6227 6228 6229 6230
    return 1;
  item_ptr = (Item**) (order+1);
  *item_ptr= item;
  order->item=item_ptr;
  order->free_me=0;
6231
  thd->lex->proc_list.link_in_list((byte*) order,(byte**) &order->next);
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bk@work.mysql.com committed
6232 6233 6234 6235 6236 6237 6238 6239 6240
  return 0;
}


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


monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
6241
bool add_to_list(THD *thd, SQL_LIST &list,Item *item,bool asc)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6242 6243 6244
{
  ORDER *order;
  DBUG_ENTER("add_to_list");
6245
  if (!(order = (ORDER *) thd->alloc(sizeof(ORDER))))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6246
    DBUG_RETURN(1);
6247 6248
  order->item_ptr= item;
  order->item= &order->item_ptr;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6249 6250 6251
  order->asc = asc;
  order->free_me=0;
  order->used=0;
6252
  order->counter_used= 0;
6253
  list.link_in_list((byte*) order,(byte**) &order->next);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6254 6255 6256 6257
  DBUG_RETURN(0);
}


monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
6258 6259 6260 6261 6262 6263 6264 6265 6266 6267
/*
  Add a table to list of used tables

  SYNOPSIS
    add_table_to_list()
    table		Table to add
    alias		alias for table (or null if no alias)
    table_options	A set of the following bits:
			TL_OPTION_UPDATING	Table will be updated
			TL_OPTION_FORCE_INDEX	Force usage of index
6268
			TL_OPTION_ALIAS	        an alias in multi table DELETE
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monty@mashka.mysql.fi committed
6269 6270 6271 6272 6273 6274 6275 6276 6277
    lock_type		How table should be locked
    use_index		List of indexed used in USE INDEX
    ignore_index	List of indexed used in IGNORE INDEX

    RETURN
      0		Error
      #		Pointer to TABLE_LIST element added to the total table list
*/

monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
6278 6279
TABLE_LIST *st_select_lex::add_table_to_list(THD *thd,
					     Table_ident *table,
6280
					     LEX_STRING *alias,
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
6281 6282
					     ulong table_options,
					     thr_lock_type lock_type,
6283 6284
					     List<String> *use_index_arg,
					     List<String> *ignore_index_arg,
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
6285
                                             LEX_STRING *option)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6286 6287
{
  register TABLE_LIST *ptr;
6288
  TABLE_LIST *previous_table_ref; /* The table preceding the current one. */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6289
  char *alias_str;
6290
  LEX *lex= thd->lex;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6291
  DBUG_ENTER("add_table_to_list");
6292
  LINT_INIT(previous_table_ref);
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bk@work.mysql.com committed
6293 6294 6295 6296

  if (!table)
    DBUG_RETURN(0);				// End of memory
  alias_str= alias ? alias->str : table->table.str;
6297 6298
  if (!test(table_options & TL_OPTION_ALIAS) && 
      check_table_name(table->table.str, table->table.length))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6299
  {
6300
    my_error(ER_WRONG_TABLE_NAME, MYF(0), table->table.str);
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bk@work.mysql.com committed
6301 6302
    DBUG_RETURN(0);
  }
6303 6304 6305

  if (table->is_derived_table() == FALSE && table->db.str &&
      check_db_name(table->db.str))
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
6306 6307 6308 6309
  {
    my_error(ER_WRONG_DB_NAME, MYF(0), table->db.str);
    DBUG_RETURN(0);
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6310 6311

  if (!alias)					/* Alias is case sensitive */
6312 6313 6314
  {
    if (table->sel)
    {
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bell@sanja.is.com.ua committed
6315 6316
      my_message(ER_DERIVED_MUST_HAVE_ALIAS,
                 ER(ER_DERIVED_MUST_HAVE_ALIAS), MYF(0));
6317 6318
      DBUG_RETURN(0);
    }
6319
    if (!(alias_str=thd->memdup(alias_str,table->table.length+1)))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6320
      DBUG_RETURN(0);
6321
  }
6322
  if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6323
    DBUG_RETURN(0);				/* purecov: inspected */
peter@mysql.com's avatar
peter@mysql.com committed
6324
  if (table->db.str)
6325 6326 6327 6328
  {
    ptr->db= table->db.str;
    ptr->db_length= table->db.length;
  }
6329 6330
  else if (thd->copy_db_to(&ptr->db, &ptr->db_length))
    DBUG_RETURN(0);
peter@mysql.com's avatar
peter@mysql.com committed
6331

6332
  ptr->alias= alias_str;
6333 6334
  if (lower_case_table_names && table->table.length)
    my_casedn_str(files_charset_info, table->table.str);
6335 6336
  ptr->table_name=table->table.str;
  ptr->table_name_length=table->table.length;
6337
  ptr->lock_type=   lock_type;
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
6338 6339
  ptr->updating=    test(table_options & TL_OPTION_UPDATING);
  ptr->force_index= test(table_options & TL_OPTION_FORCE_INDEX);
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
6340
  ptr->ignore_leaves= test(table_options & TL_OPTION_IGNORE_LEAVES);
6341
  ptr->derived=	    table->sel;
6342 6343
  if (!ptr->derived && !my_strcasecmp(system_charset_info, ptr->db,
                                      information_schema_name.str))
6344
  {
6345
    ST_SCHEMA_TABLE *schema_table= find_schema_table(thd, ptr->table_name);
6346 6347
    if (!schema_table ||
        (schema_table->hidden && 
6348
         (sql_command_flags[lex->sql_command] & CF_STATUS_COMMAND) == 0))
6349
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6350
      my_error(ER_UNKNOWN_TABLE, MYF(0),
6351
               ptr->table_name, information_schema_name.str);
6352 6353
      DBUG_RETURN(0);
    }
6354
    ptr->schema_table_name= ptr->table_name;
6355 6356
    ptr->schema_table= schema_table;
  }
6357
  ptr->select_lex=  lex->current_select;
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bell@sanja.is.com.ua committed
6358
  ptr->cacheable_table= 1;
6359 6360 6361 6362 6363 6364
  if (use_index_arg)
    ptr->use_index=(List<String> *) thd->memdup((gptr) use_index_arg,
						sizeof(*use_index_arg));
  if (ignore_index_arg)
    ptr->ignore_index=(List<String> *) thd->memdup((gptr) ignore_index_arg,
						   sizeof(*ignore_index_arg));
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igor@rurik.mysql.com committed
6365
  ptr->option= option ? option->str : 0;
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6366
  /* check that used name is unique */
6367
  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 ;
6373
	 tables ;
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	 tables=tables->next_local)
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    {
6376 6377
      if (!my_strcasecmp(table_alias_charset, alias_str, tables->alias) &&
	  !strcmp(ptr->db, tables->db))
6378
      {
6379
	my_error(ER_NONUNIQ_TABLE, MYF(0), alias_str); /* purecov: tested */
6380 6381
	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)
  {
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    /*
      table_list.next points to the last inserted TABLE_LIST->next_local'
      element
6390
      We don't use the offsetof() macro here to avoid warnings from gcc
6391
    */
6392 6393 6394
    previous_table_ref= (TABLE_LIST*) ((char*) table_list.next -
                                       ((char*) &(ptr->next_local) -
                                        (char*) ptr));
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    /*
      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;
6403
  }
6404

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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'.
  */
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6411
  table_list.link_in_list((byte*) ptr, (byte**) &ptr->next_local);
6412
  ptr->next_name_resolution_table= NULL;
6413
  /* Link table in global list (all used tables) */
6414
  lex->add_to_query_tables(ptr);
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  DBUG_RETURN(ptr);
}

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6418

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/*
  Initialize a new table list for a nested join

  SYNOPSIS
6423
    init_nested_join()
6424
    thd         current thread
6425

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  DESCRIPTION
    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.

  RETURN VALUE
    0,  if success
    1,  otherwise
*/

bool st_select_lex::init_nested_join(THD *thd)
{
  TABLE_LIST *ptr;
  NESTED_JOIN *nested_join;
  DBUG_ENTER("init_nested_join");
6445

6446 6447
  if (!(ptr= (TABLE_LIST*) thd->calloc(ALIGN_SIZE(sizeof(TABLE_LIST))+
                                       sizeof(NESTED_JOIN))))
6448
    DBUG_RETURN(1);
6449 6450 6451
  nested_join= ptr->nested_join=
    ((NESTED_JOIN*) ((byte*) ptr + ALIGN_SIZE(sizeof(TABLE_LIST))));

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  join_list->push_front(ptr);
  ptr->embedding= embedding;
  ptr->join_list= join_list;
  embedding= ptr;
  join_list= &nested_join->join_list;
  join_list->empty();
  DBUG_RETURN(0);
}


/*
  End a nested join table list

  SYNOPSIS
    end_nested_join()
    thd         current thread

  DESCRIPTION
    The function returns to the previous join nest level.
    If the current level contains only one member, the function
6472
    moves it one level up, eliminating the nest.
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  RETURN VALUE
    Pointer to TABLE_LIST element added to the total table list, if success
    0, otherwise
*/

TABLE_LIST *st_select_lex::end_nested_join(THD *thd)
{
  TABLE_LIST *ptr;
6482
  NESTED_JOIN *nested_join;
6483
  DBUG_ENTER("end_nested_join");
6484

6485
  DBUG_ASSERT(embedding);
6486 6487 6488
  ptr= embedding;
  join_list= ptr->join_list;
  embedding= ptr->embedding;
6489
  nested_join= ptr->nested_join;
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  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;
  }
6499
  else if (nested_join->join_list.elements == 0)
6500 6501
  {
    join_list->pop();
6502
    ptr= 0;                                     // return value
6503
  }
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  DBUG_RETURN(ptr);
}


/*
  Nest last join operation

  SYNOPSIS
6512
    nest_last_join()
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    thd         current thread

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

  RETURN VALUE
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    0  Error
    #  Pointer to TABLE_LIST element created for the new nested join

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*/

TABLE_LIST *st_select_lex::nest_last_join(THD *thd)
{
  TABLE_LIST *ptr;
  NESTED_JOIN *nested_join;
6528
  List<TABLE_LIST> *embedded_list;
6529
  DBUG_ENTER("nest_last_join");
6530

6531 6532
  if (!(ptr= (TABLE_LIST*) thd->calloc(ALIGN_SIZE(sizeof(TABLE_LIST))+
                                       sizeof(NESTED_JOIN))))
6533
    DBUG_RETURN(0);
6534 6535 6536
  nested_join= ptr->nested_join=
    ((NESTED_JOIN*) ((byte*) ptr + ALIGN_SIZE(sizeof(TABLE_LIST))));

6537 6538
  ptr->embedding= embedding;
  ptr->join_list= join_list;
6539
  embedded_list= &nested_join->join_list;
6540
  embedded_list->empty();
6541 6542

  for (uint i=0; i < 2; i++)
6543 6544 6545 6546 6547
  {
    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.
      */
      if (table->join_using_fields)
      {
        ptr->join_using_fields= table->join_using_fields;
        table->join_using_fields= NULL;
      }
    }
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  }
  join_list->push_front(ptr);
  nested_join->used_tables= nested_join->not_null_tables= (table_map) 0;
  DBUG_RETURN(ptr);
}


/*
  Add a table to the current join list

  SYNOPSIS
    add_joined_table()
    table       the table to add

  DESCRIPTION
    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).

  RETURN VALUE
    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;
}


/*
  Convert a right join into equivalent left join

  SYNOPSIS
    convert_right_join()
    thd         current thread
6601 6602 6603

  DESCRIPTION
    The function takes the current join list t[0],t[1] ... and
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    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
    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

  RETURN
    Pointer to the table representing the inner table, if success
    0, otherwise
*/

6627
TABLE_LIST *st_select_lex::convert_right_join()
6628 6629
{
  TABLE_LIST *tab2= join_list->pop();
6630
  TABLE_LIST *tab1= join_list->pop();
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  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

  SYNOPSIS:
    set_lock_for_tables()
    lock_type			Lock to set for tables

  NOTE:
    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
*/

6653
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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  for (TABLE_LIST *tables= (TABLE_LIST*) table_list.first;
       tables;
       tables= tables->next_local)
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  {
    tables->lock_type= lock_type;
    tables->updating=  for_update;
  }
  DBUG_VOID_RETURN;
}

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6670

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6671 6672 6673 6674 6675 6676 6677 6678 6679 6680 6681 6682 6683 6684 6685 6686 6687 6688 6689 6690 6691 6692 6693 6694 6695 6696 6697 6698 6699
/*
  Create a fake SELECT_LEX for a unit

  SYNOPSIS:
    add_fake_select_lex()
    thd			   thread handle

  DESCRIPTION
    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
    (SELECT ... ORDER BY order_list [LIMIT n]) ORDER BY ... 
    or of the form
    (SELECT ... ORDER BY LIMIT n) ORDER BY ...
  
  NOTES
    The object is used to retrieve rows from the temporary table
    where the result on the union is obtained.

  RETURN VALUES
    1     on failure to create the object
    0     on success
*/

bool st_select_lex_unit::add_fake_select_lex(THD *thd)
{
  SELECT_LEX *first_sl= first_select();
  DBUG_ENTER("add_fake_select_lex");
  DBUG_ASSERT(!fake_select_lex);
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6700

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6701 6702 6703 6704 6705
  if (!(fake_select_lex= new (thd->mem_root) SELECT_LEX()))
      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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  fake_select_lex->parent_lex= thd->lex; /* Used in init_query. */
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  fake_select_lex->make_empty_select();
  fake_select_lex->linkage= GLOBAL_OPTIONS_TYPE;
6709 6710
  fake_select_lex->select_limit= 0;

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6711
  fake_select_lex->context.outer_context=first_sl->context.outer_context;
6712 6713 6714
  /* 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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6715 6716 6717 6718 6719 6720 6721 6722 6723 6724 6725 6726 6727

  if (!first_sl->next_select())
  {
    /* 
      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;
    thd->lex->current_select= fake_select_lex;
  }
6728
  thd->lex->pop_context();
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6729 6730 6731
  DBUG_RETURN(0);
}

6732

6733
/*
6734 6735
  Push a new name resolution context for a JOIN ... ON clause to the
  context stack of a query block.
6736 6737

  SYNOPSIS
6738
    push_new_name_resolution_context()
6739
    thd       pointer to current thread
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6740
    left_op   left  operand of the JOIN
6741 6742 6743 6744
    right_op  rigth operand of the JOIN

  DESCRIPTION
    Create a new name resolution context for a JOIN ... ON clause,
6745 6746 6747
    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.
6748 6749

  RETURN
6750 6751
    FALSE  if all is OK
    TRUE   if a memory allocation error occured
6752 6753
*/

6754 6755 6756
bool
push_new_name_resolution_context(THD *thd,
                                 TABLE_LIST *left_op, TABLE_LIST *right_op)
6757 6758
{
  Name_resolution_context *on_context;
6759
  if (!(on_context= new (thd->mem_root) Name_resolution_context))
6760
    return TRUE;
6761 6762 6763 6764 6765
  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();
6766
  return thd->lex->push_context(on_context);
6767 6768 6769 6770 6771 6772 6773 6774 6775 6776 6777 6778 6779 6780 6781 6782 6783 6784 6785 6786
}


/*
  Add an ON condition to the second operand of a JOIN ... ON.

  SYNOPSIS
    add_join_on
    b     the second operand of a JOIN ... ON
    expr  the condition to be added to the ON clause

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

  RETURN
    FALSE  if there was some error
    TRUE   if all is OK
*/

void add_join_on(TABLE_LIST *b, Item *expr)
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6787
{
6788
  if (expr)
6789
  {
6790
    if (!b->on_expr)
6791
      b->on_expr= expr;
6792 6793
    else
    {
6794 6795 6796 6797 6798 6799
      /*
        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);
6800 6801
    }
    b->on_expr->top_level_item();
6802
  }
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6803 6804 6805
}


6806
/*
6807 6808
  Mark that there is a NATURAL JOIN or JOIN ... USING between two
  tables.
6809 6810 6811

  SYNOPSIS
    add_join_natural()
6812 6813 6814 6815
    a			Left join argument
    b			Right join argument
    using_fields        Field names from USING clause
  
6816
  IMPLEMENTATION
6817 6818 6819 6820 6821 6822 6823 6824 6825 6826
    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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    SELECT * FROM t1 NATURAL LEFT JOIN t2
     <=>
    SELECT * FROM t1 LEFT JOIN t2 ON (t1.i=t2.i and t1.j=t2.j ... )
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    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>)

    SELECT * FROM t1 JOIN t2 USING(j) WHERE <some_cond>
     <=>
    SELECT * FROM t1, t2 WHERE (t1.j=t2.j and <some_cond>)

  RETURN
    None
6841 6842
*/

6843
void add_join_natural(TABLE_LIST *a, TABLE_LIST *b, List<String> *using_fields)
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6844
{
6845 6846
  b->natural_join= a;
  b->join_using_fields= using_fields;
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6847 6848
}

6849

6850
/*
6851 6852 6853 6854
  Reload/resets privileges and the different caches.

  SYNOPSIS
    reload_acl_and_cache()
6855
    thd			Thread handler (can be NULL!)
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    options             What should be reset/reloaded (tables, privileges,
    slave...)
    tables              Tables to flush (if any)
    write_to_binlog     Depending on 'options', it may be very bad to write the
                        query to the binlog (e.g. FLUSH SLAVE); this is a
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                        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.
6864 6865 6866

  RETURN
    0	 ok
6867
    !=0  error.  thd->killed or thd->net.report_error is set
6868 6869
*/

6870 6871
bool reload_acl_and_cache(THD *thd, ulong options, TABLE_LIST *tables,
                          bool *write_to_binlog)
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{
  bool result=0;
  select_errors=0;				/* Write if more errors */
6875
  bool tmp_write_to_binlog= 1;
6876

6877
  DBUG_ASSERT(!thd || !thd->in_sub_stmt);
6878

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SCRUM  
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6879
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  if (options & REFRESH_GRANT)
  {
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    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)))
6888 6889
    {
      thd->thread_stack= (char*) &tmp_thd;
6890
      thd->store_globals();
6891
    }
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    if (thd)
    {
      (void)acl_reload(thd);
      (void)grant_reload(thd);
    }
    if (tmp_thd)
    {
      delete tmp_thd;
      /* Remember that we don't have a THD */
      my_pthread_setspecific_ptr(THR_THD,  0);
      thd= 0;
    }
6904
    reset_mqh((LEX_USER *)NULL, TRUE);
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  }
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#endif
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  if (options & REFRESH_LOG)
  {
6909
    /*
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6910
      Flush the normal query log, the update log, the binary log,
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      the slow query log, the relay log (if it exists) and the log
      tables.
6913
    */
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6914

6915
    /*
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      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)
6920 6921
    */
    tmp_write_to_binlog= 0;
6922
    mysql_bin_log.rotate_and_purge(RP_FORCE_ROTATE);
6923
#ifdef HAVE_REPLICATION
6924
    pthread_mutex_lock(&LOCK_active_mi);
6925
    rotate_relay_log(active_mi);
6926
    pthread_mutex_unlock(&LOCK_active_mi);
6927
#endif
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    /* flush slow and general logs */
    logger.flush_logs(thd);

    if (ha_flush_logs(NULL))
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6933
      result=1;
6934 6935
    if (flush_error_log())
      result=1;
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6936
  }
6937
#ifdef HAVE_QUERY_CACHE
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  if (options & REFRESH_QUERY_CACHE_FREE)
  {
6940
    query_cache.pack();				// FLUSH QUERY CACHE
6941
    options &= ~REFRESH_QUERY_CACHE;    // Don't flush cache, just free memory
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6942 6943 6944
  }
  if (options & (REFRESH_TABLES | REFRESH_QUERY_CACHE))
  {
6945
    query_cache.flush();			// RESET QUERY CACHE
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
6946
  }
6947
#endif /*HAVE_QUERY_CACHE*/
6948 6949 6950 6951 6952
  /*
    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)) 
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6953
  {
6954
    if ((options & REFRESH_READ_LOCK) && thd)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6955
    {
6956 6957 6958 6959 6960 6961 6962 6963 6964 6965 6966
      /*
        We must not try to aspire a global read lock if we have a write
        locked table. This would lead to a deadlock when trying to
        reopen (and re-lock) the table after the flush.
      */
      if (thd->locked_tables)
      {
        THR_LOCK_DATA **lock_p= thd->locked_tables->locks;
        THR_LOCK_DATA **end_p= lock_p + thd->locked_tables->lock_count;

        for (; lock_p < end_p; lock_p++)
monty@mysql.com's avatar
monty@mysql.com committed
6967
        {
6968 6969 6970 6971 6972
          if ((*lock_p)->type == TL_WRITE)
          {
            my_error(ER_LOCK_OR_ACTIVE_TRANSACTION, MYF(0));
            return 1;
          }
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monty@mysql.com committed
6973
        }
6974
      }
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
6975 6976 6977 6978
      /*
	Writing to the binlog could cause deadlocks, as we don't log
	UNLOCK TABLES
      */
6979
      tmp_write_to_binlog= 0;
6980
      if (lock_global_read_lock(thd))
6981
	return 1;                               // Killed
6982 6983
      result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1,
                                 tables);
6984
      if (make_global_read_lock_block_commit(thd)) // Killed
6985 6986 6987 6988 6989
      {
        /* Don't leave things in a half-locked state */
        unlock_global_read_lock(thd);
        return 1;
      }
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bk@work.mysql.com committed
6990
    }
6991 6992
    else
      result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1, tables);
6993
    my_dbopt_cleanup();
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bk@work.mysql.com committed
6994 6995 6996
  }
  if (options & REFRESH_HOSTS)
    hostname_cache_refresh();
monty@mysql.com's avatar
monty@mysql.com committed
6997
  if (thd && (options & REFRESH_STATUS))
6998
    refresh_status(thd);
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bk@work.mysql.com committed
6999 7000
  if (options & REFRESH_THREADS)
    flush_thread_cache();
7001
#ifdef HAVE_REPLICATION
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bk@work.mysql.com committed
7002
  if (options & REFRESH_MASTER)
7003
  {
7004
    DBUG_ASSERT(thd);
7005
    tmp_write_to_binlog= 0;
7006
    if (reset_master(thd))
7007
    {
7008
      result=1;
7009 7010
      thd->fatal_error();                       // Ensure client get error
    }
7011
  }
7012
#endif
7013
#ifdef OPENSSL
7014 7015 7016 7017 7018 7019
   if (options & REFRESH_DES_KEY_FILE)
   {
     if (des_key_file)
       result=load_des_key_file(des_key_file);
   }
#endif
7020
#ifdef HAVE_REPLICATION
7021 7022
 if (options & REFRESH_SLAVE)
 {
7023
   tmp_write_to_binlog= 0;
7024
   pthread_mutex_lock(&LOCK_active_mi);
7025
   if (reset_slave(thd, active_mi))
7026
     result=1;
7027
   pthread_mutex_unlock(&LOCK_active_mi);
7028
 }
7029
#endif
7030
 if (options & REFRESH_USER_RESOURCES)
monty@mysql.com's avatar
monty@mysql.com committed
7031
   reset_mqh((LEX_USER *) NULL);
7032
 *write_to_binlog= tmp_write_to_binlog;
7033
 return result;
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bk@work.mysql.com committed
7034 7035
}

7036

7037
/*
7038
  kills a thread
7039 7040 7041 7042 7043

  SYNOPSIS
    kill_one_thread()
    thd			Thread class
    id			Thread id
7044
    only_kill_query     Should it kill the query or the connection
7045 7046 7047 7048 7049

  NOTES
    This is written such that we have a short lock on LOCK_thread_count
*/

7050
uint kill_one_thread(THD *thd, ulong id, bool only_kill_query)
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bk@work.mysql.com committed
7051 7052 7053
{
  THD *tmp;
  uint error=ER_NO_SUCH_THREAD;
7054 7055
  DBUG_ENTER("kill_one_thread");
  DBUG_PRINT("enter", ("id=%lu only_kill=%d", id, only_kill_query));
7056 7057
  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For unlink from list
  I_List_iterator<THD> it(threads);
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bk@work.mysql.com committed
7058 7059
  while ((tmp=it++))
  {
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
7060 7061
    if (tmp->command == COM_DAEMON)
      continue;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
7062 7063
    if (tmp->thread_id == id)
    {
7064 7065
      pthread_mutex_lock(&tmp->LOCK_delete);	// Lock from delete
      break;
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bk@work.mysql.com committed
7066 7067 7068
    }
  }
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
7069 7070
  if (tmp)
  {
7071 7072
    if ((thd->security_ctx->master_access & SUPER_ACL) ||
	!strcmp(thd->security_ctx->user, tmp->security_ctx->user))
7073
    {
hf@genie.(none)'s avatar
SCRUM  
hf@genie.(none) committed
7074
      tmp->awake(only_kill_query ? THD::KILL_QUERY : THD::KILL_CONNECTION);
7075 7076 7077 7078 7079 7080
      error=0;
    }
    else
      error=ER_KILL_DENIED_ERROR;
    pthread_mutex_unlock(&tmp->LOCK_delete);
  }
7081 7082 7083 7084
  DBUG_PRINT("exit", ("%d", error));
  DBUG_RETURN(error);
}

7085

7086 7087 7088 7089 7090 7091 7092 7093 7094 7095 7096 7097 7098 7099
/*
  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)))
7100
    send_ok(thd);
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bk@work.mysql.com committed
7101
  else
7102
    my_error(error, MYF(0), id);
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bk@work.mysql.com committed
7103 7104
}

timour@mysql.com's avatar
timour@mysql.com committed
7105

7106 7107
	/* If pointer is not a null pointer, append filename to it */

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cmiller@zippy.(none) committed
7108 7109
bool append_file_to_dir(THD *thd, const char **filename_ptr,
                        const char *table_name)
7110
{
7111
  char buff[FN_REFLEN],*ptr, *end;
7112 7113 7114 7115 7116 7117 7118
  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))
  {
7119
    my_error(ER_WRONG_TABLE_NAME, MYF(0), *filename_ptr);
7120 7121 7122 7123
    return 1;
  }
  /* Fix is using unix filename format on dos */
  strmov(buff,*filename_ptr);
7124
  end=convert_dirname(buff, *filename_ptr, NullS);
7125
  if (!(ptr=thd->alloc((uint) (end-buff)+(uint) strlen(table_name)+1)))
7126 7127
    return 1;					// End of memory
  *filename_ptr=ptr;
7128
  strxmov(ptr,buff,table_name,NullS);
7129 7130
  return 0;
}
7131

7132

7133 7134 7135 7136 7137 7138 7139 7140 7141 7142 7143 7144 7145 7146
/*
  Check if the select is a simple select (not an union)

  SYNOPSIS
    check_simple_select()

  RETURN VALUES
    0	ok
    1	error	; In this case the error messege is sent to the client
*/

bool check_simple_select()
{
  THD *thd= current_thd;
7147 7148
  LEX *lex= thd->lex;
  if (lex->current_select != &lex->select_lex)
7149 7150
  {
    char command[80];
7151 7152
    strmake(command, lex->yylval->symbol.str,
	    min(lex->yylval->symbol.length, sizeof(command)-1));
7153
    my_error(ER_CANT_USE_OPTION_HERE, MYF(0), command);
7154 7155 7156 7157
    return 1;
  }
  return 0;
}
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7158

7159

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7160
Comp_creator *comp_eq_creator(bool invert)
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bell@sanja.is.com.ua committed
7161
{
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bell@sanja.is.com.ua committed
7162
  return invert?(Comp_creator *)&ne_creator:(Comp_creator *)&eq_creator;
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7163 7164
}

7165

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bell@sanja.is.com.ua committed
7166
Comp_creator *comp_ge_creator(bool invert)
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bell@sanja.is.com.ua committed
7167
{
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bell@sanja.is.com.ua committed
7168
  return invert?(Comp_creator *)&lt_creator:(Comp_creator *)&ge_creator;
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bell@sanja.is.com.ua committed
7169 7170
}

7171

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bell@sanja.is.com.ua committed
7172
Comp_creator *comp_gt_creator(bool invert)
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bell@sanja.is.com.ua committed
7173
{
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bell@sanja.is.com.ua committed
7174
  return invert?(Comp_creator *)&le_creator:(Comp_creator *)&gt_creator;
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7175 7176
}

7177

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bell@sanja.is.com.ua committed
7178
Comp_creator *comp_le_creator(bool invert)
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bell@sanja.is.com.ua committed
7179
{
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bell@sanja.is.com.ua committed
7180
  return invert?(Comp_creator *)&gt_creator:(Comp_creator *)&le_creator;
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bell@sanja.is.com.ua committed
7181 7182
}

7183

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bell@sanja.is.com.ua committed
7184
Comp_creator *comp_lt_creator(bool invert)
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bell@sanja.is.com.ua committed
7185
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7186
  return invert?(Comp_creator *)&ge_creator:(Comp_creator *)&lt_creator;
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bell@sanja.is.com.ua committed
7187 7188
}

7189

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bell@sanja.is.com.ua committed
7190
Comp_creator *comp_ne_creator(bool invert)
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bell@sanja.is.com.ua committed
7191
{
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bell@sanja.is.com.ua committed
7192
  return invert?(Comp_creator *)&eq_creator:(Comp_creator *)&ne_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7193
}
7194 7195 7196 7197 7198 7199 7200 7201 7202 7203 7204 7205 7206 7207 7208 7209 7210 7211 7212 7213


/*
  Construct ALL/ANY/SOME subquery Item

  SYNOPSIS
    all_any_subquery_creator()
    left_expr - pointer to left expression
    cmp - compare function creator
    all - true if we create ALL subquery
    select_lex - pointer on parsed subquery structure

  RETURN VALUE
    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)
{
serg@serg.mylan's avatar
serg@serg.mylan committed
7214
  if ((cmp == &comp_eq_creator) && !all)       //  = ANY <=> IN
7215
    return new Item_in_subselect(left_expr, select_lex);
serg@serg.mylan's avatar
serg@serg.mylan committed
7216 7217

  if ((cmp == &comp_ne_creator) && all)        // <> ALL <=> NOT IN
7218 7219 7220
    return new Item_func_not(new Item_in_subselect(left_expr, select_lex));

  Item_allany_subselect *it=
7221
    new Item_allany_subselect(left_expr, cmp, select_lex, all);
7222
  if (all)
7223
    return it->upper_item= new Item_func_not_all(it);	/* ALL */
7224

7225
  return it->upper_item= new Item_func_nop_all(it);      /* ANY/SOME */
7226
}
7227 7228


7229 7230 7231 7232 7233 7234 7235 7236 7237 7238 7239 7240
/*
  CREATE INDEX and DROP INDEX are implemented by calling ALTER TABLE with
  the proper arguments.  This isn't very fast but it should work for most
  cases.

  In the future ALTER TABLE will notice that only added indexes
  and create these one by one for the existing table without having to do
  a full rebuild.

  One should normally create all indexes with CREATE TABLE or ALTER TABLE.
*/

7241
bool mysql_create_index(THD *thd, TABLE_LIST *table_list, List<Key> &keys)
7242 7243
{
  List<create_field> fields;
7244 7245
  ALTER_INFO alter_info;
  alter_info.flags= ALTER_ADD_INDEX;
7246 7247 7248
  HA_CREATE_INFO create_info;
  DBUG_ENTER("mysql_create_index");
  bzero((char*) &create_info,sizeof(create_info));
7249
  create_info.db_type= 0;
7250
  create_info.default_table_charset= thd->variables.collation_database;
7251
  DBUG_RETURN(mysql_alter_table(thd,table_list->db,table_list->table_name,
7252
				&create_info, table_list,
7253
				fields, keys, 0, (ORDER*)0,
7254
                                0, &alter_info, 1));
7255 7256 7257
}


7258
bool mysql_drop_index(THD *thd, TABLE_LIST *table_list, ALTER_INFO *alter_info)
7259 7260 7261 7262 7263 7264
{
  List<create_field> fields;
  List<Key> keys;
  HA_CREATE_INFO create_info;
  DBUG_ENTER("mysql_drop_index");
  bzero((char*) &create_info,sizeof(create_info));
7265
  create_info.db_type= 0;
7266
  create_info.default_table_charset= thd->variables.collation_database;
7267 7268
  alter_info->clear();
  alter_info->flags= ALTER_DROP_INDEX;
7269
  DBUG_RETURN(mysql_alter_table(thd,table_list->db,table_list->table_name,
7270
				&create_info, table_list,
7271
				fields, keys, 0, (ORDER*)0,
7272
                                0, alter_info, 1));
7273
}
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merge  
bell@sanja.is.com.ua committed
7274 7275


7276 7277 7278 7279 7280
/*
  Multi update query pre-check

  SYNOPSIS
    multi_update_precheck()
7281
    thd		Thread handler
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VIEW  
bell@sanja.is.com.ua committed
7282
    tables	Global/local table list (have to be the same)
7283

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bell@sanja.is.com.ua committed
7284
  RETURN VALUE
7285 7286
    FALSE OK
    TRUE  Error
7287
*/
7288

7289
bool multi_update_precheck(THD *thd, TABLE_LIST *tables)
7290 7291 7292 7293 7294
{
  const char *msg= 0;
  TABLE_LIST *table;
  LEX *lex= thd->lex;
  SELECT_LEX *select_lex= &lex->select_lex;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
7295
  DBUG_ENTER("multi_update_precheck");
7296 7297 7298

  if (select_lex->item_list.elements != lex->value_list.elements)
  {
7299
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
7300
    DBUG_RETURN(TRUE);
7301 7302 7303 7304 7305
  }
  /*
    Ensure that we have UPDATE or SELECT privilege for each table
    The exact privilege is checked in mysql_multi_update()
  */
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VIEW  
bell@sanja.is.com.ua committed
7306
  for (table= tables; table; table= table->next_local)
7307
  {
7308 7309 7310
    if (table->derived)
      table->grant.privilege= SELECT_ACL;
    else if ((check_access(thd, UPDATE_ACL, table->db,
7311 7312
                           &table->grant.privilege, 0, 1,
                           test(table->schema_table)) ||
7313 7314
              grant_option &&
              check_grant(thd, UPDATE_ACL, table, 0, 1, 1)) &&
monty@mysql.com's avatar
monty@mysql.com committed
7315
             (check_access(thd, SELECT_ACL, table->db,
7316 7317
                           &table->grant.privilege, 0, 0,
                           test(table->schema_table)) ||
monty@mysql.com's avatar
monty@mysql.com committed
7318
              grant_option && check_grant(thd, SELECT_ACL, table, 0, 1, 0)))
7319
      DBUG_RETURN(TRUE);
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bell@sanja.is.com.ua committed
7320

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VIEW  
bell@sanja.is.com.ua committed
7321
    table->table_in_first_from_clause= 1;
7322
  }
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bell@sanja.is.com.ua committed
7323 7324 7325
  /*
    Is there tables of subqueries?
  */
7326
  if (&lex->select_lex != lex->all_selects_list || lex->time_zone_tables_used)
7327
  {
7328
    DBUG_PRINT("info",("Checking sub query list"));
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
7329
    for (table= tables; table; table= table->next_global)
7330
    {
monty@mysql.com's avatar
monty@mysql.com committed
7331 7332 7333
      if (!my_tz_check_n_skip_implicit_tables(&table,
                                              lex->time_zone_tables_used) &&
          !table->table_in_first_from_clause)
7334 7335
      {
	if (check_access(thd, SELECT_ACL, table->db,
7336 7337
			 &table->grant.privilege, 0, 0,
                         test(table->schema_table)) ||
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bell@sanja.is.com.ua committed
7338
	    grant_option && check_grant(thd, SELECT_ACL, table, 0, 1, 0))
7339
	  DBUG_RETURN(TRUE);
7340 7341 7342 7343 7344 7345
      }
    }
  }

  if (select_lex->order_list.elements)
    msg= "ORDER BY";
7346
  else if (select_lex->select_limit)
7347 7348 7349 7350
    msg= "LIMIT";
  if (msg)
  {
    my_error(ER_WRONG_USAGE, MYF(0), "UPDATE", msg);
7351
    DBUG_RETURN(TRUE);
7352
  }
7353
  DBUG_RETURN(FALSE);
7354 7355 7356 7357 7358 7359 7360
}

/*
  Multi delete query pre-check

  SYNOPSIS
    multi_delete_precheck()
7361
    thd			Thread handler
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VIEW  
bell@sanja.is.com.ua committed
7362
    tables		Global/local table list
7363

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bell@sanja.is.com.ua committed
7364
  RETURN VALUE
7365 7366
    FALSE OK
    TRUE  error
7367
*/
7368

7369
bool multi_delete_precheck(THD *thd, TABLE_LIST *tables)
7370 7371 7372
{
  SELECT_LEX *select_lex= &thd->lex->select_lex;
  TABLE_LIST *aux_tables=
7373
    (TABLE_LIST *)thd->lex->auxiliary_table_list.first;
7374
  TABLE_LIST **save_query_tables_own_last= thd->lex->query_tables_own_last;
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VIEW  
bell@sanja.is.com.ua committed
7375
  DBUG_ENTER("multi_delete_precheck");
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bell@sanja.is.com.ua committed
7376

7377 7378
  /* sql_yacc guarantees that tables and aux_tables are not zero */
  DBUG_ASSERT(aux_tables != 0);
7379
  if (check_table_access(thd, SELECT_ACL, tables, 0))
7380 7381 7382 7383 7384 7385 7386 7387 7388 7389 7390
    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;
  if (check_table_access(thd, DELETE_ACL, aux_tables, 0))
  {
    thd->lex->query_tables_own_last= save_query_tables_own_last;
7391
    DBUG_RETURN(TRUE);
7392 7393 7394
  }
  thd->lex->query_tables_own_last= save_query_tables_own_last;

7395 7396
  if ((thd->options & OPTION_SAFE_UPDATES) && !select_lex->where)
  {
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bell@sanja.is.com.ua committed
7397 7398
    my_message(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE,
               ER(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE), MYF(0));
7399
    DBUG_RETURN(TRUE);
7400
  }
7401 7402 7403 7404 7405 7406 7407 7408 7409 7410 7411 7412 7413 7414 7415 7416 7417 7418 7419 7420 7421 7422 7423 7424 7425
  DBUG_RETURN(FALSE);
}


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

  SYNOPSIS
    multi_delete_set_locks_and_link_aux_tables()
      lex - pointer to LEX representing multi-delete

  RETURN VALUE
    FALSE - success
    TRUE  - error
*/

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;

7426
  for (target_tbl= (TABLE_LIST *)lex->auxiliary_table_list.first;
7427
       target_tbl; target_tbl= target_tbl->next_local)
7428
  {
7429
    lex->table_count++;
7430 7431
    /* All tables in aux_tables must be found in FROM PART */
    TABLE_LIST *walk;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
7432
    for (walk= tables; walk; walk= walk->next_local)
7433
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7434 7435 7436
      if (!my_strcasecmp(table_alias_charset,
			 target_tbl->alias, walk->alias) &&
	  !strcmp(walk->db, target_tbl->db))
7437 7438 7439 7440
	break;
    }
    if (!walk)
    {
7441
      my_error(ER_UNKNOWN_TABLE, MYF(0),
7442
               target_tbl->table_name, "MULTI DELETE");
7443
      DBUG_RETURN(TRUE);
7444
    }
serg@serg.mylan's avatar
serg@serg.mylan committed
7445 7446 7447 7448 7449
    if (!walk->derived)
    {
      target_tbl->table_name= walk->table_name;
      target_tbl->table_name_length= walk->table_name_length;
    }
serg@serg.mylan's avatar
serg@serg.mylan committed
7450
    walk->updating= target_tbl->updating;
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bell@sanja.is.com.ua committed
7451
    walk->lock_type= target_tbl->lock_type;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
7452
    target_tbl->correspondent_table= walk;	// Remember corresponding table
7453
  }
7454
  DBUG_RETURN(FALSE);
7455 7456 7457
}


bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7458 7459 7460 7461 7462
/*
  simple UPDATE query pre-check

  SYNOPSIS
    update_precheck()
7463 7464
    thd		Thread handler
    tables	Global table list
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7465 7466

  RETURN VALUE
7467 7468
    FALSE OK
    TRUE  Error
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bell@sanja.is.com.ua committed
7469
*/
7470

7471
bool update_precheck(THD *thd, TABLE_LIST *tables)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7472 7473 7474 7475
{
  DBUG_ENTER("update_precheck");
  if (thd->lex->select_lex.item_list.elements != thd->lex->value_list.elements)
  {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7476
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
7477
    DBUG_RETURN(TRUE);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7478
  }
7479
  DBUG_RETURN(check_one_table_access(thd, UPDATE_ACL, tables));
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7480 7481 7482 7483 7484 7485 7486 7487
}


/*
  simple DELETE query pre-check

  SYNOPSIS
    delete_precheck()
7488 7489
    thd		Thread handler
    tables	Global table list
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7490 7491

  RETURN VALUE
7492 7493
    FALSE  OK
    TRUE   error
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bell@sanja.is.com.ua committed
7494
*/
7495

7496
bool delete_precheck(THD *thd, TABLE_LIST *tables)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7497 7498 7499
{
  DBUG_ENTER("delete_precheck");
  if (check_one_table_access(thd, DELETE_ACL, tables))
7500
    DBUG_RETURN(TRUE);
7501
  /* Set privilege for the WHERE clause */
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bell@sanja.is.com.ua committed
7502
  tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
7503
  DBUG_RETURN(FALSE);
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7504 7505 7506 7507 7508 7509 7510 7511
}


/*
  simple INSERT query pre-check

  SYNOPSIS
    insert_precheck()
7512 7513
    thd		Thread handler
    tables	Global table list
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bell@sanja.is.com.ua committed
7514 7515

  RETURN VALUE
7516 7517
    FALSE  OK
    TRUE   error
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bell@sanja.is.com.ua committed
7518
*/
7519

bell@sanja.is.com.ua's avatar
merge  
bell@sanja.is.com.ua committed
7520
bool insert_precheck(THD *thd, TABLE_LIST *tables)
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bell@sanja.is.com.ua committed
7521 7522 7523 7524
{
  LEX *lex= thd->lex;
  DBUG_ENTER("insert_precheck");

7525 7526 7527 7528
  /*
    Check that we have modify privileges for the first table and
    select privileges for the rest
  */
monty@mysql.com's avatar
monty@mysql.com committed
7529 7530 7531
  ulong privilege= (INSERT_ACL |
                    (lex->duplicates == DUP_REPLACE ? DELETE_ACL : 0) |
                    (lex->value_list.elements ? UPDATE_ACL : 0));
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bell@sanja.is.com.ua committed
7532 7533

  if (check_one_table_access(thd, privilege, tables))
7534
    DBUG_RETURN(TRUE);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7535

7536
  if (lex->update_list.elements != lex->value_list.elements)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7537
  {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7538
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
7539
    DBUG_RETURN(TRUE);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7540
  }
7541
  DBUG_RETURN(FALSE);
7542
}
bell@sanja.is.com.ua's avatar
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7543 7544 7545 7546 7547 7548 7549


/*
  CREATE TABLE query pre-check

  SYNOPSIS
    create_table_precheck()
7550 7551 7552
    thd			Thread handler
    tables		Global table list
    create_table	Table which will be created
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7553 7554

  RETURN VALUE
7555 7556
    FALSE   OK
    TRUE   Error
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bell@sanja.is.com.ua committed
7557
*/
7558

7559 7560
bool create_table_precheck(THD *thd, TABLE_LIST *tables,
                           TABLE_LIST *create_table)
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bell@sanja.is.com.ua committed
7561 7562
{
  LEX *lex= thd->lex;
7563 7564
  SELECT_LEX *select_lex= &lex->select_lex;
  ulong want_priv;
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merge  
bell@sanja.is.com.ua committed
7565
  bool error= TRUE;                                 // Error message is given
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7566
  DBUG_ENTER("create_table_precheck");
7567 7568 7569

  want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
              CREATE_TMP_ACL : CREATE_ACL);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7570 7571
  lex->create_info.alias= create_table->alias;
  if (check_access(thd, want_priv, create_table->db,
7572 7573
		   &create_table->grant.privilege, 0, 0,
                   test(create_table->schema_table)) ||
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bell@sanja.is.com.ua committed
7574 7575 7576
      check_merge_table_access(thd, create_table->db,
			       (TABLE_LIST *)
			       lex->create_info.merge_list.first))
7577 7578
    goto err;
  if (grant_option && want_priv != CREATE_TMP_ACL &&
7579
      check_grant(thd, want_priv, create_table, 0, 1, 0))
7580 7581 7582 7583 7584 7585
    goto err;

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

7586 7587
#ifdef NOT_NECESSARY_TO_CHECK_CREATE_TABLE_EXIST_WHEN_PREPARING_STATEMENT
    /* This code throws an ill error for CREATE TABLE t1 SELECT * FROM t1 */
7588
    /*
monty@mysql.com's avatar
monty@mysql.com committed
7589 7590 7591
      Only do the check for PS, becasue we on execute we have to check that
      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).
7592
    */
konstantin@mysql.com's avatar
konstantin@mysql.com committed
7593
    if (thd->stmt_arena->is_stmt_prepare_or_first_sp_execute())
7594
    {
monty@mysql.com's avatar
monty@mysql.com committed
7595 7596 7597 7598
      /*
        For temporary tables we don't have to check if the created table exists
      */
      if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
monty@mysql.com's avatar
monty@mysql.com committed
7599
          find_table_in_global_list(tables, create_table->db,
7600
                                    create_table->table_name))
monty@mysql.com's avatar
monty@mysql.com committed
7601
      {
7602
	error= FALSE;
monty@mysql.com's avatar
monty@mysql.com committed
7603 7604 7605
        goto err;
      }
    }
7606
#endif
7607 7608 7609
    if (tables && check_table_access(thd, SELECT_ACL, tables,0))
      goto err;
  }
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merge  
bell@sanja.is.com.ua committed
7610
  error= FALSE;
7611 7612 7613

err:
  DBUG_RETURN(error);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7614
}
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bell@sanja.is.com.ua committed
7615 7616 7617 7618 7619 7620 7621


/*
  negate given expression

  SYNOPSIS
    negate_expression()
7622
    thd  thread handler
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7623 7624 7625 7626 7627 7628 7629 7630 7631 7632 7633 7634 7635 7636 7637 7638 7639 7640 7641 7642 7643 7644 7645 7646 7647 7648 7649 7650
    expr expression for negation

  RETURN
    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);
}
7651

7652 7653
/*
  Set the specified definer to the default value, which is the current user in
7654
  the thread.
7655 7656 7657 7658 7659 7660 7661
 
  SYNOPSIS
    get_default_definer()
    thd       [in] thread handler
    definer   [out] definer
*/
 
7662
void get_default_definer(THD *thd, LEX_USER *definer)
7663 7664 7665 7666 7667 7668 7669 7670 7671 7672
{
  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);
}

7673

7674
/*
7675
  Create default definer for the specified THD.
7676 7677 7678 7679 7680 7681 7682 7683 7684 7685 7686 7687 7688 7689 7690 7691 7692 7693

  SYNOPSIS
    create_default_definer()
    thd         [in] thread handler

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

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

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

7694
  get_default_definer(thd, definer);
7695 7696 7697 7698 7699

  return definer;
}


7700
/*
7701
  Create definer with the given user and host names.
7702 7703

  SYNOPSIS
7704 7705 7706 7707
    create_definer()
    thd         [in] thread handler
    user_name   [in] user name
    host_name   [in] host name
7708 7709

  RETURN
7710
    On success, return a valid pointer to the created and initialized
7711
    LEX_USER, which contains definer information.
7712
    On error, return 0.
7713 7714
*/

7715
LEX_USER *create_definer(THD *thd, LEX_STRING *user_name, LEX_STRING *host_name)
7716
{
7717 7718 7719 7720
  LEX_USER *definer;

  /* Create and initialize. */

7721
  if (! (definer= (LEX_USER*) thd->alloc(sizeof(LEX_USER))))
7722 7723 7724 7725 7726 7727
    return 0;

  definer->user= *user_name;
  definer->host= *host_name;

  return definer;
7728
}
7729 7730 7731 7732 7733 7734 7735 7736 7737 7738 7739 7740 7741 7742 7743 7744 7745 7746 7747


/*
  Retuns information about user or current user.

  SYNOPSIS
    get_current_user()
    thd         [in] thread handler
    user        [in] user

  RETURN
    On success, return a valid pointer to initialized
    LEX_USER, which contains user information.
    On error, return 0.
*/

LEX_USER *get_current_user(THD *thd, LEX_USER *user)
{
  if (!user->user.str)  // current_user
7748 7749
    return create_default_definer(thd);

7750 7751
  return user;
}
7752 7753 7754 7755 7756 7757 7758 7759 7760 7761 7762 7763 7764 7765 7766 7767


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

  SYNOPSIS
    check_string_length()
      str         string to be checked
      err_msg     error message to be displayed if the string is too long
      max_length  max length

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

7768 7769
bool check_string_length(LEX_STRING *str, const char *err_msg,
                         uint max_length)
7770
{
7771 7772
  if (str->length <= max_length)
    return FALSE;
7773 7774

  my_error(ER_WRONG_STRING_LENGTH, MYF(0), str->str, err_msg, max_length);
7775

7776 7777
  return TRUE;
}