sql_parse.cc 218 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 */

#include "mysql_priv.h"
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#include "sql_repl.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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#ifdef HAVE_INNOBASE_DB
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#include "ha_innodb.h"
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#endif

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#ifdef HAVE_NDBCLUSTER_DB
#include "ha_ndbcluster.h"
#endif

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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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#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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#endif
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static void decrease_user_connections(USER_CONN *uc);
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static bool check_db_used(THD *thd,TABLE_LIST *tables);
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static bool check_multi_update_lock(THD *thd);
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static void remove_escape(char *name);
static void refresh_status(void);
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static bool append_file_to_dir(THD *thd, const char **filename_ptr,
			       const char *table_name);
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const char *any_db="*any*";	// Special symbol for check_access
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const char *command_name[]={
  "Sleep", "Quit", "Init DB", "Query", "Field List", "Create DB",
  "Drop DB", "Refresh", "Shutdown", "Statistics", "Processlist",
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  "Connect","Kill","Debug","Ping","Time","Delayed insert","Change user",
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  "Binlog Dump","Table Dump",  "Connect Out", "Register Slave",
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  "Prepare", "Execute", "Long Data", "Close stmt",
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  "Reset stmt", "Set option", "Fetch",
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  "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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static char empty_c_string[1]= {0};		// Used for not defined 'db'
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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
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#if defined(OS2)
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  fprintf(stderr, "Test signal %d\n", sig_ptr);
  fflush(stderr);
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#endif
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}
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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static 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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    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
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  }
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  DBUG_RETURN(error);
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}

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static bool begin_trans(THD *thd)
{
  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= ((thd->options & (ulong) ~(OPTION_STATUS_NO_TRANS_UPDATE)) |
		   OPTION_BEGIN);
    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 table_rules_on && tables && !tables_ok(thd,tables);
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}
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#endif
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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[USERNAME_LENGTH+HOSTNAME_LENGTH+2];
  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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/*
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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->db= 0;
    thd->db_length= 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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      if (thd->user_connect)
	decrease_user_connections(thd->user_connect);
      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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    mysql_log.write(thd, COM_CONNECT, ER(ER_NOT_SUPPORTED_AUTH_MODE));
    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->db= 0;
  thd->db_length= 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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      mysql_log.write(thd, COM_CONNECT, ER(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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      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",
                 ("Capabilities: %d  packet_length: %ld  Host: '%s'  "
                  "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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      mysql_log.write(thd, command,
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                      (thd->main_security_ctx.priv_user ==
                       thd->main_security_ctx.user ?
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                       (char*) "%s@%s on %s" :
                       (char*) "%s@%s as anonymous on %s"),
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                      thd->main_security_ctx.user,
                      thd->main_security_ctx.host_or_ip,
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                      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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    mysql_log.write(thd,COM_CONNECT,ER(ER_NOT_SUPPORTED_AUTH_MODE));
    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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  mysql_log.write(thd, COM_CONNECT, ER(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));
  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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  (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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}


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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

516
static int check_for_max_user_connections(THD *thd, USER_CONN *uc)
517
{
518
  int error=0;
519
  DBUG_ENTER("check_for_max_user_connections");
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  (void) pthread_mutex_lock(&LOCK_user_conn);
522
  if (max_user_connections && !uc->user_resources.user_conn &&
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      max_user_connections < (uint) uc->connections)
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  {
525
    net_printf_error(thd, ER_TOO_MANY_USER_CONNECTIONS, uc->user);
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    error=1;
    goto end;
528
  }
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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)
541
  {
542
    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;
  }
548
  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);
554
  DBUG_RETURN(error);
555
}
556
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
557

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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.
*/

576
static void decrease_user_connections(USER_CONN *uc)
577
{
578
  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);
587
  DBUG_VOID_RETURN;
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}

590

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void free_max_user_conn(void)
{
  hash_free(&hash_user_connections);
}

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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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  numbers are:
     0  - read-only query
  != 0  - query that may change a table
     2  - query that returns meaningful ROW_COUNT() -
          a number of modified rows
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*/

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char  uc_update_queries[SQLCOM_END+1];
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void init_update_queries(void)
{
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  bzero((gptr) &uc_update_queries, sizeof(uc_update_queries));

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  uc_update_queries[SQLCOM_CREATE_TABLE]=1;
  uc_update_queries[SQLCOM_CREATE_INDEX]=1;
  uc_update_queries[SQLCOM_ALTER_TABLE]=1;
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  uc_update_queries[SQLCOM_UPDATE]=2;
  uc_update_queries[SQLCOM_UPDATE_MULTI]=2;
  uc_update_queries[SQLCOM_INSERT]=2;
  uc_update_queries[SQLCOM_INSERT_SELECT]=2;
  uc_update_queries[SQLCOM_DELETE]=2;
  uc_update_queries[SQLCOM_DELETE_MULTI]=2;
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  uc_update_queries[SQLCOM_TRUNCATE]=1;
  uc_update_queries[SQLCOM_DROP_TABLE]=1;
  uc_update_queries[SQLCOM_LOAD]=1;
  uc_update_queries[SQLCOM_CREATE_DB]=1;
  uc_update_queries[SQLCOM_DROP_DB]=1;
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  uc_update_queries[SQLCOM_REPLACE]=2;
  uc_update_queries[SQLCOM_REPLACE_SELECT]=2;
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  uc_update_queries[SQLCOM_RENAME_TABLE]=1;
  uc_update_queries[SQLCOM_BACKUP_TABLE]=1;
  uc_update_queries[SQLCOM_RESTORE_TABLE]=1;
  uc_update_queries[SQLCOM_DROP_INDEX]=1;
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  uc_update_queries[SQLCOM_CREATE_VIEW]=1;
  uc_update_queries[SQLCOM_DROP_VIEW]=1;
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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);
644
  return uc_update_queries[command] != 0;
645
}
646

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647
/*
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  Reset per-hour user resource limits when it has been more than
  an hour since they were last checked
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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.
*/
660

661
static void time_out_user_resource_limits(THD *thd, USER_CONN *uc)
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{
663
  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;
  }
705
  if (check_command < (uint) SQLCOM_END)
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  {
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    /* Check that we have not done too many updates / hour */
    if (uc->user_resources.updates && uc_update_queries[check_command] &&
	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:
718
  (void) pthread_mutex_unlock(&LOCK_user_conn);
719
  DBUG_RETURN(error);
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#else
  return (0);
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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}

725

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static void reset_mqh(LEX_USER *lu, bool get_them= 0)
727
{
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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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  {
732
    USER_CONN *uc;
733
    uint temp_len=lu->user.length+lu->host.length+2;
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    char temp_user[USERNAME_LENGTH+HOSTNAME_LENGTH+2];

736 737
    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,
740
						(byte*) temp_user, temp_len)))
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    {
      uc->questions=0;
743
      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
749
  {
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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++)
752
    {
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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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    }
  }
762
  (void) pthread_mutex_unlock(&LOCK_user_conn);
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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}
765

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/*
767
    Perform handshake, authorize client and update thd ACL variables.
768
  SYNOPSIS
769
    check_connection()
770
    thd  thread handle
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  RETURN
773
     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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{
781
  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)));

789
  if (!thd->main_security_ctx.host)         // If TCP/IP connection
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  {
791
    char ip[30];
792

793
    if (vio_peer_addr(net->vio, ip, &thd->peer_port))
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      return (ER_BAD_HOST_ERROR);
795
    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);
799
    if (!(specialflag & SPECIAL_NO_RESOLVE))
800
    {
801
      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);
804
      /* Cut very long hostnames to avoid possible overflows */
805
      if (thd->main_security_ctx.host)
806
      {
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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);
  }
823
  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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833
    /* buff[] needs to big enough to hold the server_version variable */
834
    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);
837

838 839 840 841 842
    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)
845
      client_flags |= CLIENT_SSL;       /* Wow, SSL is available! */
846
#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
859
      tail: that's why first part of the scramble is placed here, and second
860 861
      part at the end of packet.
    */
862
    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 */
866
    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)) ||
877
	(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);
889
  if (thd->packet.alloc(thd->variables.net_buffer_length))
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    return(ER_OUT_OF_RESOURCES);

  thd->client_capabilities=uint2korr(net->read_pos);
893 894 895 896
  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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    DBUG_PRINT("info", ("client_character_set: %d", (uint) net->read_pos[8]));
    /*
      Use server character set and collation if
900
      - opt_character_set_client_handshake is not set
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      - client has not specified a character set
      - client character set is the same as the servers
      - client character set doesn't exists in server
    */
905
    if (!opt_character_set_client_handshake ||
906
        !(thd->variables.character_set_client=
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	  get_charset((uint) net->read_pos[8], MYF(0))) ||
	!my_strcasecmp(&my_charset_latin1,
		       global_system_variables.character_set_client->name,
		       thd->variables.character_set_client->name))
911
    {
912 913
      thd->variables.character_set_client=
	global_system_variables.character_set_client;
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      thd->variables.collation_connection=
	global_system_variables.collation_connection;
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      thd->variables.character_set_results=
	global_system_variables.character_set_results;
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    }
    else
    {
921
      thd->variables.character_set_results=
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      thd->variables.collation_connection= 
	thd->variables.character_set_client;
    }
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    thd->update_charset();
926
    end= (char*) net->read_pos+32;
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  }
  else
  {
    thd->max_client_packet_length= uint3korr(net->read_pos+2);
    end= (char*) net->read_pos+5;
  }

934
  if (thd->client_capabilities & CLIENT_IGNORE_SPACE)
935
    thd->variables.sql_mode|= MODE_IGNORE_SPACE;
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#ifdef HAVE_OPENSSL
937
  DBUG_PRINT("info", ("client capabilities: %d", thd->client_capabilities));
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  if (thd->client_capabilities & CLIENT_SSL)
  {
    /* Do the SSL layering. */
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    if (!ssl_acceptor_fd)
    {
      inc_host_errors(&thd->remote.sin_addr);
      return(ER_HANDSHAKE_ERROR);
    }
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    DBUG_PRINT("info", ("IO layer change in progress..."));
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    if (sslaccept(ssl_acceptor_fd, net->vio, thd->variables.net_wait_timeout))
    {
949
      DBUG_PRINT("error", ("Failed to accept new SSL connection"));
950
      inc_host_errors(&thd->remote.sin_addr);
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      return(ER_HANDSHAKE_ERROR);
952
    }
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    DBUG_PRINT("info", ("Reading user information over SSL layer"));
954
    if ((pkt_len= my_net_read(net)) == packet_error ||
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	pkt_len < NORMAL_HANDSHAKE_SIZE)
    {
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      DBUG_PRINT("error", ("Failed to read user information (pkt_len= %lu)",
			   pkt_len));
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      inc_host_errors(&thd->remote.sin_addr);
      return(ER_HANDSHAKE_ERROR);
    }
  }
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#endif

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

  if (thd->client_capabilities & CLIENT_INTERACTIVE)
972
    thd->variables.net_wait_timeout= thd->variables.net_interactive_timeout;
973
  if ((thd->client_capabilities & CLIENT_TRANSACTIONS) &&
974 975
      opt_using_transactions)
    net->return_status= &thd->server_status;
976
  net->read_timeout=(uint) thd->variables.net_read_timeout;
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977

978 979
  char *user= end;
  char *passwd= strend(user)+1;
980
  char *db= passwd;
981
  char db_buff[NAME_LEN+1];                     // buffer to store db in utf8
982
  char user_buff[USERNAME_LENGTH+1];		// buffer to store user in utf8
983 984 985
  uint dummy_errors;

  /*
986 987 988 989
    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'.
  */
990
  uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ?
991 992 993
    *passwd++ : strlen(passwd);
  db= thd->client_capabilities & CLIENT_CONNECT_WITH_DB ?
    db + passwd_len + 1 : 0;
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994

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995 996
  /* Since 4.1 all database names are stored in utf8 */
  if (db)
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997
  {
998 999 1000
    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
                             system_charset_info,
                             db, strlen(db),
1001
                             thd->charset(), &dummy_errors)]= 0;
1002
    db= db_buff;
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1003
  }
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1004

1005 1006 1007 1008
  user_buff[copy_and_convert(user_buff, sizeof(user_buff)-1,
                             system_charset_info, user, strlen(user),
                             thd->charset(), &dummy_errors)]= '\0';
  user= user_buff;
1009

1010 1011 1012
  if (thd->main_security_ctx.user)
    x_free(thd->main_security_ctx.user);
  if (!(thd->main_security_ctx.user= my_strdup(user, MYF(0))))
1013
    return (ER_OUT_OF_RESOURCES);
1014
  return check_user(thd, COM_CONNECT, passwd, passwd_len, db, TRUE);
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1015 1016
}

1017

1018 1019
void execute_init_command(THD *thd, sys_var_str *init_command_var,
			  rw_lock_t *var_mutex)
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gluh@gluh.mysql.r18.ru committed
1020 1021 1022 1023
{
  Vio* save_vio;
  ulong save_client_capabilities;

1024 1025 1026 1027 1028 1029 1030 1031 1032
  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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1033 1034
  save_client_capabilities= thd->client_capabilities;
  thd->client_capabilities|= CLIENT_MULTI_QUERIES;
1035 1036 1037 1038
  /*
    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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1039 1040
  save_vio= thd->net.vio;
  thd->net.vio= 0;
1041
  thd->net.no_send_error= 0;
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1042
  dispatch_command(COM_QUERY, thd, thd->query, thd->query_length+1);
1043
  rw_unlock(var_mutex);
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1044 1045 1046 1047 1048
  thd->client_capabilities= save_client_capabilities;
  thd->net.vio= save_vio;
}


1049
pthread_handler_t handle_one_connection(void *arg)
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1050 1051 1052
{
  THD *thd=(THD*) arg;
  uint launch_time  =
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1053
    (uint) ((thd->thr_create_time = time(NULL)) - thd->connect_time);
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1054 1055 1056 1057 1058
  if (launch_time >= slow_launch_time)
    statistic_increment(slow_launch_threads,&LOCK_status );

  pthread_detach_this_thread();

1059
#if !defined( __WIN__) && !defined(OS2)	// Win32 calls this in pthread_create
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1060
  /* The following calls needs to be done before we call DBUG_ macros */
1061
  if (!(test_flags & TEST_NO_THREADS) & my_thread_init())
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1062
  {
1063
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
1064
    statistic_increment(aborted_connects,&LOCK_status);
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1065 1066 1067 1068 1069
    end_thread(thd,0);
    return 0;
  }
#endif

1070 1071 1072 1073 1074 1075 1076
  /*
    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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1077 1078
  DBUG_PRINT("info", ("handle_one_connection called by thread %d\n",
		      thd->thread_id));
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1079
  /* now that we've called my_thread_init(), it is safe to call DBUG_* */
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1080

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1081
#if defined(__WIN__)
1082
  init_signals();
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1083
#elif !defined(OS2) && !defined(__NETWARE__)
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1084 1085 1086 1087 1088 1089
  sigset_t set;
  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
#endif
  if (thd->store_globals())
  {
1090
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
1091
    statistic_increment(aborted_connects,&LOCK_status);
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1092 1093 1094 1095 1096 1097 1098 1099
    end_thread(thd,0);
    return 0;
  }

  do
  {
    int error;
    NET *net= &thd->net;
1100
    Security_context *sctx= thd->security_ctx;
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1101
    thd->thread_stack= (char*) &thd;
1102
    net->no_send_error= 0;
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1103

1104
    if ((error=check_connection(thd)))
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1105 1106
    {						// Wrong permissions
      if (error > 0)
1107
	net_printf_error(thd, error, sctx->host_or_ip);
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1108 1109
#ifdef __NT__
      if (vio_type(net->vio) == VIO_TYPE_NAMEDPIPE)
1110
	my_sleep(1000);				/* must wait after eof() */
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1111
#endif
1112
      statistic_increment(aborted_connects,&LOCK_status);
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1113 1114
      goto end_thread;
    }
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1115
#ifdef __NETWARE__
1116
    netware_reg_user(sctx->ip, sctx->user, "MySQL");
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1117
#endif
1118
    if (thd->variables.max_join_size == HA_POS_ERROR)
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1119 1120 1121 1122
      thd->options |= OPTION_BIG_SELECTS;
    if (thd->client_capabilities & CLIENT_COMPRESS)
      net->compress=1;				// Use compression

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1123
    thd->version= refresh_version;
1124
    thd->proc_info= 0;
1125
    thd->command= COM_SLEEP;
1126 1127
    thd->set_time();
    thd->init_for_queries();
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1128

1129
    if (sys_init_connect.value_length && !(sctx->master_access & SUPER_ACL))
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gluh@gluh.mysql.r18.ru committed
1130
    {
1131 1132
      execute_init_command(thd, &sys_init_connect, &LOCK_sys_init_connect);
      if (thd->query_error)
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1133
	thd->killed= THD::KILL_CONNECTION;
1134 1135 1136
      thd->proc_info=0;
      thd->set_time();
      thd->init_for_queries();
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1137 1138
    }

1139 1140
    while (!net->error && net->vio != 0 &&
           !(thd->killed == THD::KILL_CONNECTION))
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1141
    {
1142
      net->no_send_error= 0;
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1143 1144 1145
      if (do_command(thd))
	break;
    }
1146 1147
    if (thd->user_connect)
      decrease_user_connections(thd->user_connect);
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1148
    if (net->error && net->vio != 0 && net->report_error)
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1149
    {
1150
      if (!thd->killed && thd->variables.log_warnings > 1)
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1151
	sql_print_warning(ER(ER_NEW_ABORTING_CONNECTION),
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serg@serg.mylan committed
1152
                          thd->thread_id,(thd->db ? thd->db : "unconnected"),
1153 1154
                          sctx->user ? sctx->user : "unauthenticated",
                          sctx->host_or_ip,
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serg@serg.mylan committed
1155 1156
                          (net->last_errno ? ER(net->last_errno) :
                           ER(ER_UNKNOWN_ERROR)));
1157
      net_send_error(thd, net->last_errno, NullS);
1158
      statistic_increment(aborted_threads,&LOCK_status);
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1159
    }
1160 1161 1162 1163
    else if (thd->killed)
    {
      statistic_increment(aborted_threads,&LOCK_status);
    }
1164
    
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1165
end_thread:
1166
    close_connection(thd, 0, 1);
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1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177
    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;
  } 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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1178 1179
#endif /* EMBEDDED_LIBRARY */

1180 1181 1182 1183
/*
  Execute commands from bootstrap_file.
  Used when creating the initial grant tables
*/
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1184

1185
pthread_handler_t handle_bootstrap(void *arg)
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1186
{
1187 1188 1189
  THD *thd=(THD*) arg;
  FILE *file=bootstrap_file;
  char *buff;
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1190

1191
  /* The following must be called before DBUG_ENTER */
1192
  if (my_thread_init() || thd->store_globals())
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1193
  {
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1194
#ifndef EMBEDDED_LIBRARY
1195
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
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1196
#endif
1197
    thd->fatal_error();
1198
    goto end;
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1199
  }
1200 1201
  DBUG_ENTER("handle_bootstrap");

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1202
#ifndef EMBEDDED_LIBRARY
1203 1204
  pthread_detach_this_thread();
  thd->thread_stack= (char*) &thd;
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1205
#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__)
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1206
  sigset_t set;
1207 1208
  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
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1209
#endif
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1210
#endif /* EMBEDDED_LIBRARY */
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1211

1212
  if (thd->variables.max_join_size == HA_POS_ERROR)
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1213 1214 1215 1216
    thd->options |= OPTION_BIG_SELECTS;

  thd->proc_info=0;
  thd->version=refresh_version;
1217 1218
  thd->security_ctx->priv_user=
    thd->security_ctx->user= (char*) my_strdup("boot", MYF(MY_WME));
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1219

1220
  buff= (char*) thd->net.buff;
1221
  thd->init_for_queries();
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1222 1223
  while (fgets(buff, thd->net.max_packet, file))
  {
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1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243
   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;

1244
    while (length && (my_isspace(thd->charset(), buff[length-1]) ||
1245
           buff[length-1] == ';'))
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1246 1247
      length--;
    buff[length]=0;
1248
    thd->query_length=length;
1249 1250
    thd->query= thd->memdup_w_gap(buff, length+1, 
				  thd->db_length+1+QUERY_CACHE_FLAGS_SIZE);
1251
    thd->query[length] = '\0';
1252 1253 1254 1255
    /*
      We don't need to obtain LOCK_thread_count here because in bootstrap
      mode we have only one thread.
    */
1256
    thd->query_id=next_query_id();
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1257 1258
    mysql_parse(thd,thd->query,length);
    close_thread_tables(thd);			// Free tables
1259
    if (thd->is_fatal_error)
1260
      break;
1261
    free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
1262
#ifdef USING_TRANSACTIONS
1263
    free_root(&thd->transaction.mem_root,MYF(MY_KEEP_PREALLOC));
1264
#endif
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1265
  }
1266 1267 1268

  /* thd->fatal_error should be set in case something went wrong */
end:
1269 1270 1271 1272 1273 1274
  bootstrap_error= thd->is_fatal_error;

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

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1275
#ifndef EMBEDDED_LIBRARY
1276 1277 1278
  (void) pthread_mutex_lock(&LOCK_thread_count);
  thread_count--;
  (void) pthread_mutex_unlock(&LOCK_thread_count);
1279
  (void) pthread_cond_broadcast(&COND_thread_count);
1280 1281
  my_thread_end();
  pthread_exit(0);
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1282
#endif
1283
  DBUG_RETURN(0);
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1284 1285
}

1286
    /* This works because items are allocated with sql_alloc() */
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1287

1288
void free_items(Item *item)
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1289
{
1290
  Item *next;
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1291
  DBUG_ENTER("free_items");
1292 1293 1294
  for (; item ; item=next)
  {
    next=item->next;
1295
    item->delete_self();
1296
  }
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1297
  DBUG_VOID_RETURN;
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1298 1299
}

1300 1301 1302 1303
    /* This works because items are allocated with sql_alloc() */

void cleanup_items(Item *item)
{
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1304
  DBUG_ENTER("cleanup_items");  
1305 1306
  for (; item ; item=item->next)
    item->cleanup();
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1307
  DBUG_VOID_RETURN;
1308 1309
}

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1310 1311 1312 1313 1314 1315 1316
int mysql_table_dump(THD* thd, char* db, char* tbl_name, int fd)
{
  TABLE* table;
  TABLE_LIST* table_list;
  int error = 0;
  DBUG_ENTER("mysql_table_dump");
  db = (db && db[0]) ? db : thd->db;
1317
  if (!(table_list = (TABLE_LIST*) thd->calloc(sizeof(TABLE_LIST))))
1318
    DBUG_RETURN(1); // out of memory
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VIEW  
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1319
  table_list->db= db;
1320
  table_list->table_name= table_list->alias= tbl_name;
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VIEW  
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1321 1322
  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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1323

1324 1325
  if (!db || check_db_name(db))
  {
1326
    my_error(ER_WRONG_DB_NAME ,MYF(0), db ? db : "NULL");
1327 1328
    goto err;
  }
1329
  if (lower_case_table_names)
1330
    my_casedn_str(files_charset_info, tbl_name);
1331
  remove_escape(table_list->table_name);
1332 1333 1334 1335

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

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1336
  if (check_one_table_access(thd, SELECT_ACL, table_list))
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1337 1338
    goto err;
  thd->free_list = 0;
1339
  thd->query_length=(uint) strlen(tbl_name);
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1340
  thd->query = tbl_name;
1341
  if ((error = mysqld_dump_create_info(thd, table_list, -1)))
1342
  {
1343
    my_error(ER_GET_ERRNO, MYF(0), my_errno);
1344 1345
    goto err;
  }
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1346
  net_flush(&thd->net);
1347
  if ((error= table->file->dump(thd,fd)))
1348
    my_error(ER_GET_ERRNO, MYF(0), error);
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1349

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1350
err:
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1351
  DBUG_RETURN(error);
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1352 1353
}

1354 1355 1356 1357
/*
  Ends the current transaction and (maybe) begin the next

  SYNOPSIS
1358
    end_trans()
1359 1360 1361 1362 1363 1364 1365
      thd            Current thread
      completion     Completion type

  RETURN
    0 - OK
*/

1366
int end_trans(THD *thd, enum enum_mysql_completiontype completion)
1367 1368 1369
{
  bool do_release= 0;
  int res= 0;
1370
  DBUG_ENTER("end_trans");
1371

1372
  if (unlikely(thd->in_sub_stmt))
1373 1374 1375 1376
  {
    my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0));
    DBUG_RETURN(1);
  }
1377 1378 1379 1380 1381 1382
  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);
  }
1383 1384 1385 1386 1387 1388 1389 1390
  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;
1391
    res= ha_commit(thd);
1392
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
1393 1394
    break;
  case COMMIT_RELEASE:
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    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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1402
    do_release= 1; /* fall through */
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  case ROLLBACK:
  case ROLLBACK_AND_CHAIN:
  {
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
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1407
    if (ha_rollback(thd))
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      res= -1;
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
    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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1419

1420 1421 1422
  if (res < 0)
    my_error(thd->killed_errno(), MYF(0));
  else if ((res == 0) && do_release)
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1423 1424
    thd->killed= THD::KILL_CONNECTION;

1425 1426
  DBUG_RETURN(res);
}
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1427

1428
#ifndef EMBEDDED_LIBRARY
1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439

/*
  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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1440 1441 1442
bool do_command(THD *thd)
{
  char *packet;
1443 1444
  uint old_timeout;
  ulong packet_length;
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1445 1446 1447 1448 1449
  NET *net;
  enum enum_server_command command;
  DBUG_ENTER("do_command");

  net= &thd->net;
1450 1451 1452 1453
  /*
    indicator of uninitialized lex => normal flow of errors handling
    (see my_message_sql)
  */
1454
  thd->lex->current_select= 0;
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1455 1456

  packet=0;
1457
  old_timeout=net->read_timeout;
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1458
  /* Wait max for 8 hours */
1459
  net->read_timeout=(uint) thd->variables.net_wait_timeout;
1460
  thd->clear_error();				// Clear error message
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1461 1462 1463 1464

  net_new_transaction(net);
  if ((packet_length=my_net_read(net)) == packet_error)
  {
1465 1466 1467 1468 1469
    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)
1470 1471
    {
      statistic_increment(aborted_threads,&LOCK_status);
1472
      DBUG_RETURN(TRUE);			// We have to close it.
1473
    }
1474
    net_send_error(thd, net->last_errno, NullS);
1475
    net->error= 0;
1476
    DBUG_RETURN(FALSE);
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  }
  else
  {
    packet=(char*) net->read_pos;
    command = (enum enum_server_command) (uchar) packet[0];
1482 1483
    if (command >= COM_END)
      command= COM_END;				// Wrong command
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1484 1485 1486
    DBUG_PRINT("info",("Command on %s = %d (%s)",
		       vio_description(net->vio), command,
		       command_name[command]));
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1487
  }
1488
  net->read_timeout=old_timeout;		// restore it
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  /*
    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.
  */
1498
  DBUG_RETURN(dispatch_command(command,thd, packet+1, (uint) packet_length));
1499
}
1500
#endif  /* EMBEDDED_LIBRARY */
1501

1502

1503 1504
/*
   Perform one connection-level (COM_XXXX) command.
1505

1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518
  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
*/
1519

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bool dispatch_command(enum enum_server_command command, THD *thd,
		      char* packet, uint packet_length)
{
  NET *net= &thd->net;
1524
  bool error= 0;
1525 1526
  DBUG_ENTER("dispatch_command");

1527 1528 1529
  if (thd->killed == THD::KILL_QUERY || thd->killed == THD::KILL_BAD_DATA)
    thd->killed= THD::NOT_KILLED;

1530
  thd->command=command;
1531
  /*
1532 1533
    Commands which always take a long time are logged into
    the slow log only if opt_log_slow_admin_statements is set.
1534
  */
1535
  thd->enable_slow_log= TRUE;
1536
  thd->lex->sql_command= SQLCOM_END; /* to avoid confusing VIEW detectors */
1537
  thd->set_time();
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  VOID(pthread_mutex_lock(&LOCK_thread_count));
  thd->query_id=query_id;
  if (command != COM_STATISTICS && command != COM_PING)
1541
    next_query_id();
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1542
  thread_running++;
1543
  /* TODO: set thd->lex->sql_command to SQLCOM_END here */
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1544
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
1545

1546 1547
  thd->server_status&=
           ~(SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED);
1548
  switch (command) {
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1549
  case COM_INIT_DB:
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1550 1551
  {
    LEX_STRING tmp;
1552 1553
    statistic_increment(thd->status_var.com_stat[SQLCOM_CHANGE_DB],
			&LOCK_status);
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1554 1555
    thd->convert_string(&tmp, system_charset_info,
			packet, strlen(packet), thd->charset());
1556 1557
    if (!mysql_change_db(thd, tmp.str, FALSE))
    {
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1558
      mysql_log.write(thd,command,"%s",thd->db);
1559 1560
      send_ok(thd);
    }
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1561 1562
    break;
  }
1563
#ifdef HAVE_REPLICATION
1564 1565
  case COM_REGISTER_SLAVE:
  {
1566
    if (!register_slave(thd, (uchar*)packet, packet_length))
1567
      send_ok(thd);
1568 1569
    break;
  }
1570
#endif
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1571
  case COM_TABLE_DUMP:
1572 1573 1574 1575 1576
  {
    char *db, *tbl_name;
    uint db_len= *(uchar*) packet;
    uint tbl_len= *(uchar*) (packet + db_len + 1);

1577
    statistic_increment(thd->status_var.com_other, &LOCK_status);
1578
    thd->enable_slow_log= opt_log_slow_admin_statements;
1579 1580 1581
    db= thd->alloc(db_len + tbl_len + 2);
    tbl_name= strmake(db, packet + 1, db_len)+1;
    strmake(tbl_name, packet + db_len + 2, tbl_len);
1582
    mysql_table_dump(thd, db, tbl_name, -1);
1583 1584
    break;
  }
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1585 1586
  case COM_CHANGE_USER:
  {
1587
    thd->change_user();
1588
    thd->clear_error();                         // if errors from rollback
1589

1590
    statistic_increment(thd->status_var.com_other, &LOCK_status);
1591
    char *user= (char*) packet;
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1592
    char *passwd= strend(user)+1;
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    /* 
      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).
    */
1598
    char db_buff[NAME_LEN+1];                 // buffer to store db in utf8 
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    char *db= passwd;
    uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ? 
      *passwd++ : strlen(passwd);
    db+= passwd_len + 1;
1603
#ifndef EMBEDDED_LIBRARY
1604
    /* Small check for incoming packet */
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1605
    if ((uint) ((uchar*) db - net->read_pos) > packet_length)
1606
    {
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1607
      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
1608 1609
      break;
    }
1610
#endif
1611
    /* Convert database name to utf8 */
1612
    uint dummy_errors;
1613 1614
    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
                             system_charset_info, db, strlen(db),
1615
                             thd->charset(), &dummy_errors)]= 0;
1616
    db= db_buff;
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1617

1618 1619 1620
    /* Save user and privileges */
    uint save_db_length= thd->db_length;
    char *save_db= thd->db;
1621
    Security_context save_security_ctx= *thd->security_ctx;
1622
    USER_CONN *save_user_connect= thd->user_connect;
1623 1624

    if (!(thd->security_ctx->user= my_strdup(user, MYF(0))))
1625
    {
1626
      thd->security_ctx->user= save_security_ctx.user;
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1627
      my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
1628 1629
      break;
    }
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1630

1631 1632
    /* Clear variables that are allocated */
    thd->user_connect= 0;
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1633
    int res= check_user(thd, COM_CHANGE_USER, passwd, passwd_len, db, FALSE);
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1634

1635 1636
    if (res)
    {
1637
      /* authentication failure, we shall restore old user */
1638
      if (res > 0)
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1639
        my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
1640 1641
      x_free(thd->security_ctx->user);
      *thd->security_ctx= save_security_ctx;
1642
      thd->user_connect= save_user_connect;
1643 1644 1645 1646 1647 1648
      thd->db= save_db;
      thd->db_length= save_db_length;
    }
    else
    {
      /* we've authenticated new user */
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1649 1650
      if (save_user_connect)
	decrease_user_connections(save_user_connect);
1651
      x_free((gptr) save_db);
1652
      x_free((gptr)  save_security_ctx.user);
1653
    }
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1654 1655
    break;
  }
1656
  case COM_STMT_EXECUTE:
1657
  {
1658
    mysql_stmt_execute(thd, packet, packet_length);
1659 1660
    break;
  }
1661
  case COM_STMT_FETCH:
1662 1663 1664 1665
  {
    mysql_stmt_fetch(thd, packet, packet_length);
    break;
  }
1666
  case COM_STMT_SEND_LONG_DATA:
1667
  {
1668
    mysql_stmt_get_longdata(thd, packet, packet_length);
1669 1670
    break;
  }
1671
  case COM_STMT_PREPARE:
1672
  {
1673
    mysql_stmt_prepare(thd, packet, packet_length);
1674 1675
    break;
  }
1676
  case COM_STMT_CLOSE:
1677
  {
1678
    mysql_stmt_close(thd, packet);
1679 1680
    break;
  }
1681
  case COM_STMT_RESET:
1682 1683 1684 1685
  {
    mysql_stmt_reset(thd, packet);
    break;
  }
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1686 1687
  case COM_QUERY:
  {
1688 1689
    if (alloc_query(thd, packet, packet_length))
      break;					// fatal error is set
1690
    char *packet_end= thd->query + thd->query_length;
1691
    mysql_log.write(thd,command,"%s",thd->query);
1692
    DBUG_PRINT("query",("%-.4096s",thd->query));
1693 1694 1695 1696

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

1697
    mysql_parse(thd,thd->query, thd->query_length);
1698

1699
    while (!thd->killed && thd->lex->found_semicolon && !thd->net.report_error)
1700
    {
1701
      char *packet= thd->lex->found_semicolon;
1702
      net->no_send_error= 0;
1703
      /*
1704
        Multiple queries exits, execute them individually
1705
	in embedded server - just store them to be executed later 
1706
      */
1707
#ifndef EMBEDDED_LIBRARY
1708 1709
      if (thd->lock || thd->open_tables || thd->derived_tables ||
          thd->prelocked_mode)
1710
        close_thread_tables(thd);
1711
#endif
1712
      ulong length= (ulong)(packet_end-packet);
1713

1714
      log_slow_statement(thd);
1715

1716
      /* Remove garbage at start of query */
1717
      while (my_isspace(thd->charset(), *packet) && length > 0)
1718 1719 1720 1721
      {
        packet++;
        length--;
      }
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1722
      VOID(pthread_mutex_lock(&LOCK_thread_count));
1723
      thd->query_length= length;
1724
      thd->query= packet;
1725
      thd->query_id= next_query_id();
1726
      thd->set_time(); /* Reset the query start time. */
1727
      /* TODO: set thd->lex->sql_command to SQLCOM_END here */
1728
      VOID(pthread_mutex_unlock(&LOCK_thread_count));
1729
#ifndef EMBEDDED_LIBRARY
1730
      mysql_parse(thd, packet, length);
1731
#else
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1732 1733 1734 1735 1736 1737 1738 1739 1740 1741
      /*
	'packet' can point inside the query_rest's buffer
	so we have to do memmove here
       */
      if (thd->query_rest.length() > length)
      {
	memmove(thd->query_rest.c_ptr(), packet, length);
	thd->query_rest.length(length);
      }
      else
1742
	thd->query_rest.copy(packet, length, thd->query_rest.charset());
1743 1744 1745

      thd->server_status&= ~ (SERVER_QUERY_NO_INDEX_USED |
                              SERVER_QUERY_NO_GOOD_INDEX_USED);
1746 1747
      break;
#endif /*EMBEDDED_LIBRARY*/
1748 1749
    }

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1750 1751 1752 1753 1754
    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),WAIT_PRIOR);
    DBUG_PRINT("info",("query ready"));
    break;
  }
1755
  case COM_FIELD_LIST:				// This isn't actually needed
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1756
#ifdef DONT_ALLOW_SHOW_COMMANDS
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1757 1758
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0));	/* purecov: inspected */
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1759 1760 1761
    break;
#else
  {
1762
    char *fields, *pend;
1763 1764
    /* Locked closure of all tables */
    TABLE_LIST *locked_tables= NULL;
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1765
    TABLE_LIST table_list;
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1766
    LEX_STRING conv_name;
1767
    /* Saved variable value */
1768 1769
    my_bool old_innodb_table_locks= 
              IF_INNOBASE_DB(thd->variables.innodb_table_locks, FALSE);
1770

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1771

1772 1773
    statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_FIELDS],
			&LOCK_status);
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1774 1775 1776
    bzero((char*) &table_list,sizeof(table_list));
    if (!(table_list.db=thd->db))
    {
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1777
      my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
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1778 1779
      break;
    }
1780
    pend= strend(packet);
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1781 1782
    thd->convert_string(&conv_name, system_charset_info,
			packet, (uint) (pend-packet), thd->charset());
1783
    table_list.alias= table_list.table_name= conv_name.str;
1784
    packet= pend+1;
1785 1786 1787 1788 1789 1790 1791 1792 1793

    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;
    }

1794
    thd->query_length= strlen(packet);       // for simplicity: don't optimize
1795 1796
    if (!(thd->query=fields=thd->memdup(packet,thd->query_length+1)))
      break;
1797
    mysql_log.write(thd,command,"%s %s",table_list.table_name, fields);
1798
    if (lower_case_table_names)
1799 1800
      my_casedn_str(files_charset_info, table_list.table_name);
    remove_escape(table_list.table_name);	// This can't have wildcards
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1801

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1802
    if (check_access(thd,SELECT_ACL,table_list.db,&table_list.grant.privilege,
1803
		     0, 0, test(table_list.schema_table)))
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1804
      break;
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1805 1806
    if (grant_option &&
	check_grant(thd, SELECT_ACL, &table_list, 2, UINT_MAX, 0))
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1807
      break;
1808 1809 1810 1811 1812 1813
    /* 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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1814
    thd->lex->add_to_query_tables(&table_list);
1815

1816 1817
    /* switch on VIEW optimisation: do not fill temporary tables */
    thd->lex->sql_command= SQLCOM_SHOW_FIELDS;
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1818
    mysqld_list_fields(thd,&table_list,fields);
1819
    thd->lex->unit.cleanup();
1820
    thd->cleanup_after_query();
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1821 1822 1823 1824
    break;
  }
#endif
  case COM_QUIT:
1825
    /* We don't calculate statistics for this command */
1826
    mysql_log.write(thd,command,NullS);
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1827 1828 1829 1830
    net->error=0;				// Don't give 'abort' message
    error=TRUE;					// End server
    break;

1831
  case COM_CREATE_DB:				// QQ: To be removed
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1832
    {
1833
      char *db=thd->strdup(packet), *alias;
1834
      HA_CREATE_INFO create_info;
1835

1836 1837
      statistic_increment(thd->status_var.com_stat[SQLCOM_CREATE_DB],
			  &LOCK_status);
1838
      // null test to handle EOM
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1839
      if (!db || !(alias= thd->strdup(db)) || check_db_name(db))
1840
      {
1841
	my_error(ER_WRONG_DB_NAME, MYF(0), db ? db : "NULL");
1842 1843
	break;
      }
1844
      if (check_access(thd,CREATE_ACL,db,0,1,0,is_schema_db(db)))
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1845
	break;
1846
      mysql_log.write(thd,command,packet);
1847
      bzero(&create_info, sizeof(create_info));
1848 1849
      mysql_create_db(thd, (lower_case_table_names == 2 ? alias : db),
                      &create_info, 0);
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1850 1851
      break;
    }
1852
  case COM_DROP_DB:				// QQ: To be removed
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1853
    {
1854 1855
      statistic_increment(thd->status_var.com_stat[SQLCOM_DROP_DB],
			  &LOCK_status);
1856
      char *db=thd->strdup(packet);
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1857
      /*  null test to handle EOM */
1858
      if (!db || check_db_name(db))
1859
      {
1860
	my_error(ER_WRONG_DB_NAME, MYF(0), db ? db : "NULL");
1861 1862
	break;
      }
1863
      if (check_access(thd,DROP_ACL,db,0,1,0,is_schema_db(db)))
1864
	break;
1865 1866
      if (thd->locked_tables || thd->active_transaction())
      {
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1867 1868
	my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                   ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
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1869
	break;
1870
      }
1871
      mysql_log.write(thd,command,db);
1872
      mysql_rm_db(thd, db, 0, 0);
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1873 1874
      break;
    }
1875
#ifndef EMBEDDED_LIBRARY
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1876 1877
  case COM_BINLOG_DUMP:
    {
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1878 1879 1880 1881
      ulong pos;
      ushort flags;
      uint32 slave_server_id;

1882
      statistic_increment(thd->status_var.com_other,&LOCK_status);
1883
      thd->enable_slow_log= opt_log_slow_admin_statements;
1884
      if (check_global_access(thd, REPL_SLAVE_ACL))
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1885
	break;
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1886

1887
      /* TODO: The following has to be changed to an 8 byte integer */
1888 1889
      pos = uint4korr(packet);
      flags = uint2korr(packet + 4);
1890
      thd->server_id=0; /* avoid suicide */
1891
      if ((slave_server_id= uint4korr(packet+6))) // mysqlbinlog.server_id==0
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1892
	kill_zombie_dump_threads(slave_server_id);
1893
      thd->server_id = slave_server_id;
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1894 1895 1896

      mysql_log.write(thd, command, "Log: '%s'  Pos: %ld", packet+10,
                      (long) pos);
1897
      mysql_binlog_send(thd, thd->strdup(packet + 10), (my_off_t) pos, flags);
1898
      unregister_slave(thd,1,1);
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1899
      /*  fake COM_QUIT -- if we get here, the thread needs to terminate */
1900 1901
      error = TRUE;
      net->error = 0;
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1902 1903
      break;
    }
1904
#endif
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1905
  case COM_REFRESH:
1906 1907 1908 1909 1910 1911
  {
    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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1912
      break;
1913 1914 1915 1916 1917
    mysql_log.write(thd,command,NullS);
    if (!reload_acl_and_cache(thd, options, (TABLE_LIST*) 0, &not_used))
      send_ok(thd);
    break;
  }
1918
#ifndef EMBEDDED_LIBRARY
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1919
  case COM_SHUTDOWN:
1920
  {
1921
    statistic_increment(thd->status_var.com_other, &LOCK_status);
1922
    if (check_global_access(thd,SHUTDOWN_ACL))
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1923
      break; /* purecov: inspected */
1924
    /*
1925 1926 1927 1928
      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].
1929
    */
1930 1931
    enum mysql_enum_shutdown_level level=
      (enum mysql_enum_shutdown_level) (uchar) packet[0];
1932
    DBUG_PRINT("quit",("Got shutdown command for level %u", level));
1933 1934 1935 1936 1937 1938 1939
    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;
    }
1940
    DBUG_PRINT("quit",("Got shutdown command for level %u", level));
1941
    mysql_log.write(thd,command,NullS);
1942
    send_eof(thd);
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1943 1944 1945
#ifdef __WIN__
    sleep(1);					// must wait after eof()
#endif
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1946
#ifndef OS2
1947
    send_eof(thd);				// This is for 'quit request'
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1948
#endif
1949
    close_connection(thd, 0, 1);
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1950 1951 1952 1953
    close_thread_tables(thd);			// Free before kill
    kill_mysql();
    error=TRUE;
    break;
1954
  }
1955
#endif
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1956 1957
  case COM_STATISTICS:
  {
1958
    mysql_log.write(thd,command,NullS);
1959 1960
    statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_STATUS],
			&LOCK_status);
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1961
#ifndef EMBEDDED_LIBRARY
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1962
    char buff[200];
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1963 1964 1965
#else
    char *buff= thd->net.last_error;
#endif
1966
    ulong uptime = (ulong) (thd->start_time - start_time);
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1967
    sprintf((char*) buff,
1968
	    "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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1969
	    uptime,
1970 1971 1972
	    (int) thread_count, (ulong) thd->query_id,
            (ulong) thd->status_var.long_query_count,
	    thd->status_var.opened_tables, refresh_version, cached_tables(),
1973 1974
	    (uptime ? (ulonglong2double(thd->query_id) / (double) uptime) :
	     (double) 0));
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1975
#ifdef SAFEMALLOC
1976
    if (sf_malloc_cur_memory)				// Using SAFEMALLOC
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1977
      sprintf(strend(buff), "  Memory in use: %ldK  Max memory used: %ldK",
1978 1979
	      (sf_malloc_cur_memory+1023L)/1024L,
	      (sf_malloc_max_memory+1023L)/1024L);
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1980 1981
#endif
#ifndef EMBEDDED_LIBRARY
1982
    VOID(my_net_write(net, buff,(uint) strlen(buff)));
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1983
    VOID(net_flush(net));
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1984
#endif
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1985 1986 1987
    break;
  }
  case COM_PING:
1988
    statistic_increment(thd->status_var.com_other, &LOCK_status);
1989
    send_ok(thd);				// Tell client we are alive
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1990 1991
    break;
  case COM_PROCESS_INFO:
1992 1993
    statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_PROCESSLIST],
			&LOCK_status);
1994 1995
    if (!thd->security_ctx->priv_user[0] &&
        check_global_access(thd, PROCESS_ACL))
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1996
      break;
1997
    mysql_log.write(thd,command,NullS);
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1998
    mysqld_list_processes(thd,
1999 2000
			  thd->security_ctx->master_access & PROCESS_ACL ? 
			  NullS : thd->security_ctx->priv_user, 0);
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2001 2002 2003
    break;
  case COM_PROCESS_KILL:
  {
2004
    statistic_increment(thd->status_var.com_stat[SQLCOM_KILL], &LOCK_status);
2005
    ulong id=(ulong) uint4korr(packet);
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SCRUM  
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2006
    kill_one_thread(thd,id,false);
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2007 2008
    break;
  }
2009 2010
  case COM_SET_OPTION:
  {
2011 2012
    statistic_increment(thd->status_var.com_stat[SQLCOM_SET_OPTION],
			&LOCK_status);
2013 2014 2015 2016
    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;
2017
      send_eof(thd);
2018 2019 2020
      break;
    case MYSQL_OPTION_MULTI_STATEMENTS_OFF:
      thd->client_capabilities&= ~CLIENT_MULTI_STATEMENTS;
2021
      send_eof(thd);
2022 2023
      break;
    default:
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2024
      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
2025 2026 2027 2028
      break;
    }
    break;
  }
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2029
  case COM_DEBUG:
2030
    statistic_increment(thd->status_var.com_other, &LOCK_status);
2031
    if (check_global_access(thd, SUPER_ACL))
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2032
      break;					/* purecov: inspected */
2033
    mysql_print_status();
2034
    mysql_log.write(thd,command,NullS);
2035
    send_eof(thd);
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2036 2037 2038 2039 2040
    break;
  case COM_SLEEP:
  case COM_CONNECT:				// Impossible here
  case COM_TIME:				// Impossible from client
  case COM_DELAYED_INSERT:
2041
  case COM_END:
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2042
  default:
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2043
    my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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2044 2045
    break;
  }
2046 2047
  if (thd->lock || thd->open_tables || thd->derived_tables ||
      thd->prelocked_mode)
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2048 2049 2050 2051
  {
    thd->proc_info="closing tables";
    close_thread_tables(thd);			/* Free tables */
  }
2052 2053 2054 2055 2056 2057 2058 2059 2060 2061
  /*
    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())
2062
    thd->transaction.xid_state.xid.null();
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2063

2064 2065 2066
  /* report error issued during command execution */
  if (thd->killed_errno() && !thd->net.report_error)
    thd->send_kill_message();
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2067
  if (thd->net.report_error)
2068
    net_send_error(thd);
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2069

2070
  log_slow_statement(thd);
2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085

  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);
}


2086
void log_slow_statement(THD *thd)
2087
{
2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098
  time_t start_of_query;

  /*
    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))
    return;                                     // Don't set time for sub stmt

  start_of_query= thd->start_time;
2099
  thd->end_time();				// Set start time
2100

2101 2102 2103 2104 2105
  /*
    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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2106
  {
2107 2108
    thd->proc_info="logging slow query";

2109 2110
    if ((ulong) (thd->start_time - thd->time_after_lock) >
	thd->variables.long_query_time ||
2111 2112
	((thd->server_status &
	  (SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED)) &&
2113
	 (specialflag & SPECIAL_LOG_QUERIES_NOT_USING_INDEXES)))
2114
    {
2115
      thd->status_var.long_query_count++;
2116 2117
      mysql_slow_log.write(thd, thd->query, thd->query_length, start_of_query);
    }
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2118 2119 2120
  }
}

2121

2122 2123 2124 2125 2126
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;
2127
  switch (schema_table_idx) {
2128 2129
  case SCH_SCHEMATA:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
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2130 2131
    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0));   /* purecov: inspected */
2132 2133 2134 2135 2136 2137 2138 2139 2140 2141
    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:
2142
  case SCH_TRIGGERS:
2143
#ifdef DONT_ALLOW_SHOW_COMMANDS
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2144 2145
    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */
2146 2147 2148 2149 2150 2151
    DBUG_RETURN(1);
#else
    {
      char *db= lex->select_lex.db ? lex->select_lex.db : thd->db;
      if (!db)
      {
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2152 2153
	my_message(ER_NO_DB_ERROR,
                   ER(ER_NO_DB_ERROR), MYF(0)); /* purecov: inspected */
2154 2155 2156 2157 2158
        DBUG_RETURN(1);				/* purecov: inspected */
      }
      remove_escape(db);				// Fix escaped '_'
      if (check_db_name(db))
      {
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2159
        my_error(ER_WRONG_DB_NAME, MYF(0), db);
2160 2161
        DBUG_RETURN(1);
      }
2162 2163
      if (check_access(thd, SELECT_ACL, db, &thd->col_access, 0, 0,
                       is_schema_db(db)))
2164 2165 2166
        DBUG_RETURN(1);			        /* purecov: inspected */
      if (!thd->col_access && check_grant_db(thd,db))
      {
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2167
	my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
2168 2169
                 thd->security_ctx->priv_user, thd->security_ctx->priv_host,
                 db);
2170 2171
	DBUG_RETURN(1);
      }
2172 2173 2174 2175 2176
      /*
        We need to do a copy to make this prepared statement safe if this
        was thd->db
      */
      lex->select_lex.db= thd->strdup(db);
2177 2178 2179 2180 2181 2182
      break;
    }
#endif
  case SCH_COLUMNS:
  case SCH_STATISTICS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
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2183 2184
    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */
2185 2186 2187 2188 2189 2190
    DBUG_RETURN(1);
#else
    if (table_ident)
    {
      TABLE_LIST **query_tables_last= lex->query_tables_last;
      sel= new SELECT_LEX();
2191 2192
      /* 'parent_lex' is used in init_query() so it must be before it. */
      sel->parent_lex= lex;
2193
      sel->init_query();
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2194
      if (!sel->add_table_to_list(thd, table_ident, 0, 0, TL_READ, 
2195 2196 2197 2198 2199 2200
                                 (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;
      remove_escape(db);			// Fix escaped '_'
2201
      remove_escape(table_list->table_name);
2202
      if (check_access(thd,SELECT_ACL | EXTRA_ACL,db,
2203 2204
                       &table_list->grant.privilege, 0, 0,
                       test(table_list->schema_table)))
2205 2206 2207 2208 2209 2210 2211
        DBUG_RETURN(1);				/* purecov: inspected */
      if (grant_option && check_grant(thd, SELECT_ACL, table_list, 2,
                                      UINT_MAX, 0))
        DBUG_RETURN(1);
      break;
    }
#endif
2212 2213 2214
  case SCH_OPEN_TABLES:
  case SCH_VARIABLES:
  case SCH_STATUS:
2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235
  case SCH_PROCEDURES:
  case SCH_CHARSETS:
  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;
2236
  table_list->schema_table_reformed= 1;
2237 2238
  statistic_increment(thd->status_var.com_stat[lex->orig_sql_command],
                      &LOCK_status);
2239 2240 2241 2242
  DBUG_RETURN(0);
}


2243 2244
/*
  Read query from packet and store in thd->query
2245
  Used in COM_QUERY and COM_STMT_PREPARE
2246 2247 2248 2249 2250 2251 2252

  DESCRIPTION
    Sets the following THD variables:
      query
      query_length

  RETURN VALUES
2253 2254
    FALSE ok
    TRUE  error;  In this case thd->fatal_error is set
2255 2256
*/

2257
bool alloc_query(THD *thd, const char *packet, uint packet_length)
2258 2259
{
  packet_length--;				// Remove end null
2260
  /* Remove garbage at start and end of query */
2261
  while (my_isspace(thd->charset(),packet[0]) && packet_length > 0)
2262 2263 2264 2265
  {
    packet++;
    packet_length--;
  }
2266
  const char *pos= packet + packet_length;     // Point at end null
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2267
  while (packet_length > 0 &&
2268
	 (pos[-1] == ';' || my_isspace(thd->charset() ,pos[-1])))
2269 2270 2271 2272 2273
  {
    pos--;
    packet_length--;
  }
  /* We must allocate some extra memory for query cache */
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2274
  thd->query_length= 0;                        // Extra safety: Avoid races
2275 2276
  if (!(thd->query= (char*) thd->memdup_w_gap((gptr) (packet),
					      packet_length,
2277 2278
					      thd->db_length+ 1 +
					      QUERY_CACHE_FLAGS_SIZE)))
2279
    return TRUE;
2280 2281
  thd->query[packet_length]=0;
  thd->query_length= packet_length;
2282 2283 2284 2285

  /* Reclaim some memory */
  thd->packet.shrink(thd->variables.net_buffer_length);
  thd->convert_buffer.shrink(thd->variables.net_buffer_length);
2286

2287
  return FALSE;
2288 2289
}

2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305
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;
}

2306

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2307 2308 2309 2310 2311
/****************************************************************************
** mysql_execute_command
** Execute command saved in thd and current_lex->sql_command
****************************************************************************/

2312
bool
2313
mysql_execute_command(THD *thd)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2314
{
2315
  bool	res= FALSE;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2316
  int result= 0;
2317
  LEX	*lex= thd->lex;
monty@mysql.com's avatar
monty@mysql.com committed
2318
  /* first SELECT_LEX (have special meaning for many of non-SELECTcommands) */
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2319
  SELECT_LEX *select_lex= &lex->select_lex;
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VIEW  
bell@sanja.is.com.ua committed
2320
  /* first table of first SELECT_LEX */
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monty@mysql.com committed
2321
  TABLE_LIST *first_table= (TABLE_LIST*) select_lex->table_list.first;
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VIEW  
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2322 2323 2324
  /* list of all tables in query */
  TABLE_LIST *all_tables;
  /* most outer SELECT_LEX_UNIT of query */
2325
  SELECT_LEX_UNIT *unit= &lex->unit;
2326
  /* Saved variable value */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2327
  DBUG_ENTER("mysql_execute_command");
2328
  thd->net.no_send_error= 0;
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bk@work.mysql.com committed
2329

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VIEW  
bell@sanja.is.com.ua committed
2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345
  /*
    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();
2346
  /* should be assigned after making first tables same */
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VIEW  
bell@sanja.is.com.ua committed
2347
  all_tables= lex->query_tables;
2348 2349 2350 2351
  /* 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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VIEW  
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2352

2353 2354 2355 2356 2357
  /*
    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.
2358
    Don't reset warnings when executing a stored routine.
2359
  */
2360
  if ((all_tables || &lex->select_lex != lex->all_selects_list ||
2361
       lex->sroutines.records) && !thd->spcont ||
2362
      lex->time_zone_tables_used)
monty@mysql.com's avatar
monty@mysql.com committed
2363
    mysql_reset_errors(thd, 0);
2364

hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
2365
#ifdef HAVE_REPLICATION
2366 2367
  if (thd->slave_thread)
  {
peter@mysql.com's avatar
peter@mysql.com committed
2368
    /*
2369 2370
      Check if statment should be skipped because of slave filtering
      rules
2371 2372

      Exceptions are:
2373 2374
      - UPDATE MULTI: For this statement, we want to check the filtering
        rules later in the code
2375
      - SET: we always execute it (Not that many SET commands exists in
lars@mysql.com's avatar
lars@mysql.com committed
2376 2377
        the binary log anyway -- only 4.1 masters write SET statements,
	in 5.0 there are no SET statements in the binary log)
2378 2379
      - DROP TEMPORARY TABLE IF EXISTS: we always execute it (otherwise we
        have stale files on slave caused by exclusion of one tmp table).
monty@hundin.mysql.fi's avatar
merge  
monty@hundin.mysql.fi committed
2380
    */
2381 2382
    if (!(lex->sql_command == SQLCOM_UPDATE_MULTI) &&
	!(lex->sql_command == SQLCOM_SET_OPTION) &&
2383
	!(lex->sql_command == SQLCOM_DROP_TABLE &&
2384
          lex->drop_temporary && lex->drop_if_exists) &&
guilhem@mysql.com's avatar
Merge  
guilhem@mysql.com committed
2385
        all_tables_not_ok(thd, all_tables))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
2386 2387
    {
      /* we warn the slave SQL thread */
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2388
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
2389
      reset_one_shot_variables(thd);
2390
      DBUG_RETURN(0);
guilhem@mysql.com's avatar
guilhem@mysql.com committed
2391
    }
monty@hundin.mysql.fi's avatar
merge  
monty@hundin.mysql.fi committed
2392 2393
#ifndef TO_BE_DELETED
    /*
2394 2395 2396
      This is a workaround to deal with the shortcoming in 3.23.44-3.23.46
      masters in RELEASE_LOCK() logging. We re-write SELECT RELEASE_LOCK()
      as DO RELEASE_LOCK()
monty@hundin.mysql.fi's avatar
merge  
monty@hundin.mysql.fi committed
2397
    */
2398 2399 2400
    if (lex->sql_command == SQLCOM_SELECT)
    {
      lex->sql_command = SQLCOM_DO;
2401
      lex->insert_list = &select_lex->item_list;
2402
    }
monty@hundin.mysql.fi's avatar
merge  
monty@hundin.mysql.fi committed
2403
#endif
2404
  }
2405
#endif /* HAVE_REPLICATION */
2406

2407 2408 2409 2410 2411
  /*
    When option readonly is set deny operations which change tables.
    Except for the replication thread and the 'super' users.
  */
  if (opt_readonly &&
2412 2413
      !(thd->slave_thread ||
        (thd->security_ctx->master_access & SUPER_ACL)) &&
2414
      uc_update_queries[lex->sql_command])
2415
  {
2416
    my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
2417
    DBUG_RETURN(-1);
2418
  }
2419 2420 2421
  if(lex->orig_sql_command == SQLCOM_END)
    statistic_increment(thd->status_var.com_stat[lex->sql_command],
                        &LOCK_status);
2422

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2423 2424 2425
  switch (lex->sql_command) {
  case SQLCOM_SELECT:
  {
2426 2427 2428 2429
    /* assign global limit variable if limit is not given */
    {
      SELECT_LEX *param= lex->unit.global_parameters;
      if (!param->explicit_limit)
2430 2431
	param->select_limit=
          new Item_int((ulonglong)thd->variables.select_limit);
2432 2433
    }

2434
    select_result *result=lex->result;
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VIEW  
bell@sanja.is.com.ua committed
2435
    if (all_tables)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2436
    {
2437 2438 2439 2440 2441 2442
      if (lex->orig_sql_command != SQLCOM_SHOW_STATUS_PROC &&
          lex->orig_sql_command != SQLCOM_SHOW_STATUS_FUNC)
        res= check_table_access(thd,
                                lex->exchange ? SELECT_ACL | FILE_ACL :
                                SELECT_ACL,
                                all_tables, 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2443 2444
    }
    else
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2445 2446
      res= check_access(thd,
			lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL,
2447
			any_db, 0, 0, 0, 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2448
    if (res)
2449
      goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2450

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2451
    if (!(res= open_and_lock_tables(thd, all_tables)))
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2452
    {
2453
      if (lex->describe)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2454
      {
2455 2456 2457 2458 2459 2460
        /*
          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.
        */
2461
	if (!(result= new select_send()))
2462
	  goto error;
2463 2464
	else
	  thd->send_explain_fields(result);
2465
	res= mysql_explain_union(thd, &thd->lex->unit, result);
2466 2467 2468 2469 2470
	if (lex->describe & DESCRIBE_EXTENDED)
	{
	  char buff[1024];
	  String str(buff,(uint32) sizeof(buff), system_charset_info);
	  str.length(0);
pem@mysql.comhem.se's avatar
pem@mysql.comhem.se committed
2471
	  thd->lex->unit.print(&str);
2472 2473 2474 2475
	  str.append('\0');
	  push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
		       ER_YES, str.ptr());
	}
2476
	result->send_eof();
2477
        delete result;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2478 2479 2480
      }
      else
      {
2481
	if (!result && !(result= new select_send()))
2482
          goto error;
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VIEW  
bell@sanja.is.com.ua committed
2483
	query_cache_store_query(thd, all_tables);
2484
	res= handle_select(thd, lex, result, 0);
2485 2486
        if (result != lex->result)
          delete result;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2487
      }
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2488
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2489 2490
    break;
  }
sergefp@mysql.com's avatar
sergefp@mysql.com committed
2491
  case SQLCOM_PREPARE:
2492
  {
2493
    mysql_sql_stmt_prepare(thd);
sergefp@mysql.com's avatar
sergefp@mysql.com committed
2494 2495 2496 2497
    break;
  }
  case SQLCOM_EXECUTE:
  {
2498
    mysql_sql_stmt_execute(thd);
sergefp@mysql.com's avatar
sergefp@mysql.com committed
2499 2500 2501 2502
    break;
  }
  case SQLCOM_DEALLOCATE_PREPARE:
  {
2503
    mysql_sql_stmt_close(thd);
sergefp@mysql.com's avatar
sergefp@mysql.com committed
2504 2505
    break;
  }
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2506
  case SQLCOM_DO:
2507 2508
    if (check_table_access(thd, SELECT_ACL, all_tables, 0) ||
        open_and_lock_tables(thd, all_tables))
2509
      goto error;
2510 2511

    res= mysql_do(thd, *lex->insert_list);
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2512 2513
    break;

2514
  case SQLCOM_EMPTY_QUERY:
2515
    send_ok(thd);
2516 2517
    break;

2518 2519 2520 2521
  case SQLCOM_HELP:
    res= mysqld_help(thd,lex->help_arg);
    break;

2522
#ifndef EMBEDDED_LIBRARY
2523
  case SQLCOM_PURGE:
2524
  {
2525
    if (check_global_access(thd, SUPER_ACL))
2526
      goto error;
monty@mysql.com's avatar
monty@mysql.com committed
2527
    /* PURGE MASTER LOGS TO 'file' */
2528 2529 2530
    res = purge_master_logs(thd, lex->to_log);
    break;
  }
2531 2532
  case SQLCOM_PURGE_BEFORE:
  {
2533 2534
    Item *it;

2535 2536
    if (check_global_access(thd, SUPER_ACL))
      goto error;
monty@mysql.com's avatar
monty@mysql.com committed
2537
    /* PURGE MASTER LOGS BEFORE 'data' */
2538
    it= (Item *)lex->value_list.head();
2539
    if ((!it->fixed && it->fix_fields(lex->thd, &it)) ||
2540
        it->check_cols(1))
2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551
    {
      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());
2552 2553
    break;
  }
2554
#endif
2555 2556
  case SQLCOM_SHOW_WARNS:
  {
2557 2558
    res= mysqld_show_warnings(thd, (ulong)
			      ((1L << (uint) MYSQL_ERROR::WARN_LEVEL_NOTE) |
2559 2560 2561
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_WARN) |
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR)
			       ));
2562 2563 2564 2565
    break;
  }
  case SQLCOM_SHOW_ERRORS:
  {
2566 2567
    res= mysqld_show_warnings(thd, (ulong)
			      (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR));
2568 2569
    break;
  }
2570 2571
  case SQLCOM_SHOW_NEW_MASTER:
  {
2572
    if (check_global_access(thd, REPL_SLAVE_ACL))
2573
      goto error;
2574
    /* This query don't work now. See comment in repl_failsafe.cc */
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2575
#ifndef WORKING_NEW_MASTER
2576 2577
    my_error(ER_NOT_SUPPORTED_YET, MYF(0), "SHOW NEW MASTER");
    goto error;
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2578
#else
2579 2580
    res = show_new_master(thd);
    break;
2581
#endif
2582
  }
2583

2584
#ifdef HAVE_REPLICATION
2585 2586
  case SQLCOM_SHOW_SLAVE_HOSTS:
  {
2587
    if (check_global_access(thd, REPL_SLAVE_ACL))
2588 2589 2590 2591
      goto error;
    res = show_slave_hosts(thd);
    break;
  }
2592 2593
  case SQLCOM_SHOW_BINLOG_EVENTS:
  {
2594
    if (check_global_access(thd, REPL_SLAVE_ACL))
2595
      goto error;
2596
    res = mysql_show_binlog_events(thd);
2597 2598
    break;
  }
2599 2600
#endif

2601
  case SQLCOM_BACKUP_TABLE:
2602
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2603 2604 2605
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL, all_tables, 0) ||
2606
	check_global_access(thd, FILE_ACL))
2607
      goto error; /* purecov: inspected */
2608
    thd->enable_slow_log= opt_log_slow_admin_statements;
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VIEW  
bell@sanja.is.com.ua committed
2609
    res = mysql_backup_table(thd, first_table);
2610

2611 2612
    break;
  }
2613
  case SQLCOM_RESTORE_TABLE:
2614
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2615 2616 2617
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, INSERT_ACL, all_tables, 0) ||
2618
	check_global_access(thd, FILE_ACL))
2619
      goto error; /* purecov: inspected */
2620
    thd->enable_slow_log= opt_log_slow_admin_statements;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2621
    res = mysql_restore_table(thd, first_table);
2622 2623
    break;
  }
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2624 2625
  case SQLCOM_ASSIGN_TO_KEYCACHE:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2626 2627 2628
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
        check_access(thd, INDEX_ACL, first_table->db,
2629 2630
                     &first_table->grant.privilege, 0, 0,
                     test(first_table->schema_table)))
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2631
      goto error;
2632
    res= mysql_assign_to_keycache(thd, first_table, &lex->ident);
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2633 2634
    break;
  }
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2635 2636
  case SQLCOM_PRELOAD_KEYS:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2637 2638 2639
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_access(thd, INDEX_ACL, first_table->db,
2640 2641
                     &first_table->grant.privilege, 0, 0,
                     test(first_table->schema_table)))
2642
      goto error;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2643
    res = mysql_preload_keys(thd, first_table);
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2644 2645
    break;
  }
2646
#ifdef HAVE_REPLICATION
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2647
  case SQLCOM_CHANGE_MASTER:
2648
  {
2649
    if (check_global_access(thd, SUPER_ACL))
2650
      goto error;
2651
    pthread_mutex_lock(&LOCK_active_mi);
2652
    res = change_master(thd,active_mi);
2653
    pthread_mutex_unlock(&LOCK_active_mi);
2654 2655
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2656
  case SQLCOM_SHOW_SLAVE_STAT:
2657
  {
2658 2659
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2660
      goto error;
2661
    pthread_mutex_lock(&LOCK_active_mi);
2662
    res = show_master_info(thd,active_mi);
2663
    pthread_mutex_unlock(&LOCK_active_mi);
2664 2665
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2666
  case SQLCOM_SHOW_MASTER_STAT:
2667
  {
2668 2669
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2670 2671 2672 2673
      goto error;
    res = show_binlog_info(thd);
    break;
  }
peter@mysql.com's avatar
peter@mysql.com committed
2674

2675
  case SQLCOM_LOAD_MASTER_DATA: // sync with master
2676
    if (check_global_access(thd, SUPER_ACL))
2677
      goto error;
2678
    if (end_active_trans(thd))
2679
      goto error;
2680 2681
    else
      res = load_master_data(thd);
2682
    break;
2683
#endif /* HAVE_REPLICATION */
2684 2685 2686 2687 2688 2689 2690
#ifdef HAVE_NDBCLUSTER_DB
  case SQLCOM_SHOW_NDBCLUSTER_STATUS:
    {
      res = ndbcluster_show_status(thd);
      break;
    }
#endif
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2691 2692 2693
#ifdef HAVE_INNOBASE_DB
  case SQLCOM_SHOW_INNODB_STATUS:
    {
2694
      if (check_global_access(thd, SUPER_ACL))
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2695 2696 2697 2698
	goto error;
      res = innodb_show_status(thd);
      break;
    }
vtkachenko@intelp4d.mysql.com's avatar
vtkachenko@intelp4d.mysql.com committed
2699 2700 2701
  case SQLCOM_SHOW_MUTEX_STATUS:
    {
      if (check_global_access(thd, SUPER_ACL))
vtkachenko@intelp4d.mysql.com's avatar
vtkachenko@intelp4d.mysql.com committed
2702
        goto error;
vtkachenko@intelp4d.mysql.com's avatar
vtkachenko@intelp4d.mysql.com committed
2703 2704 2705
      res = innodb_mutex_show_status(thd);
      break;
    }
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2706
#endif
2707
#ifdef HAVE_REPLICATION
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2708
  case SQLCOM_LOAD_MASTER_TABLE:
2709
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2710 2711 2712 2713
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (!first_table->db)
      first_table->db= thd->db;
    if (check_access(thd, CREATE_ACL, first_table->db,
2714 2715
		     &first_table->grant.privilege, 0, 0,
                     test(first_table->schema_table)))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2716 2717 2718 2719
      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
2720
      if (check_grant(thd, CREATE_ACL, all_tables, 0, 1, 0))
2721
	goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2722
    }
2723
    if (strlen(first_table->table_name) > NAME_LEN)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2724
    {
2725
      my_error(ER_WRONG_TABLE_NAME, MYF(0), first_table->table_name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2726 2727
      break;
    }
2728
    pthread_mutex_lock(&LOCK_active_mi);
2729 2730 2731 2732
    /*
      fetch_master_table will send the error to the client on failure.
      Give error if the table already exists.
    */
2733
    if (!fetch_master_table(thd, first_table->db, first_table->table_name,
2734
			    active_mi, 0, 0))
2735
    {
2736
      send_ok(thd);
2737
    }
2738
    pthread_mutex_unlock(&LOCK_active_mi);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2739
    break;
2740
  }
2741
#endif /* HAVE_REPLICATION */
2742

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2743
  case SQLCOM_CREATE_TABLE:
2744
  {
2745
    /* If CREATE TABLE of non-temporary table, do implicit commit */
2746 2747 2748 2749 2750 2751 2752 2753 2754 2755
    if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE))
    {
      if (end_active_trans(thd))
      {
	res= -1;
	break;
      }
    }
    else 
    {
2756 2757
      /* So that CREATE TEMPORARY TABLE gets to binlog at commit/rollback */
      thd->options|= OPTION_STATUS_NO_TRANS_UPDATE;
2758
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2759 2760 2761 2762 2763
    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
2764

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2765
    if ((res= create_table_precheck(thd, select_tables, create_table)))
monty@mysql.com's avatar
monty@mysql.com committed
2766
      goto end_with_restore_list;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2767

2768 2769 2770
#ifndef HAVE_READLINK
    lex->create_info.data_file_name=lex->create_info.index_file_name=0;
#else
2771
    /* Fix names if symlinked tables */
2772
    if (append_file_to_dir(thd, &lex->create_info.data_file_name,
2773
			   create_table->table_name) ||
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2774
	append_file_to_dir(thd, &lex->create_info.index_file_name,
2775
			   create_table->table_name))
monty@mysql.com's avatar
monty@mysql.com committed
2776
      goto end_with_restore_list;
2777
#endif
2778
    /*
2779
      If we are using SET CHARSET without DEFAULT, add an implicit
2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790
      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;
    }
2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805
    /*
      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.
    */
    if (wait_if_global_read_lock(thd, 0, 1))
    {
monty@mysql.com's avatar
monty@mysql.com committed
2806 2807
      res= 1;
      goto end_with_restore_list;
2808
    }
2809
    if (select_lex->item_list.elements)		// With select
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2810 2811
    {
      select_result *result;
2812

2813
      select_lex->options|= SELECT_NO_UNLOCK;
2814
      unit->set_limit(select_lex);
2815

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2816
      if (!(res= open_and_lock_tables(thd, select_tables)))
2817
      {
2818 2819 2820 2821
        /*
          Is table which we are changing used somewhere in other parts
          of query
        */
2822
        if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE))
2823
        {
2824 2825 2826 2827 2828 2829 2830
          TABLE_LIST *duplicate;
          if ((duplicate= unique_table(create_table, select_tables)))
          {
            update_non_unique_table_error(create_table, "CREATE", duplicate);
            res= 1;
            goto end_with_restart_wait;
          }
2831
        }
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2832 2833 2834 2835 2836 2837 2838 2839
        /* 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)
          {
2840 2841
            TABLE_LIST *duplicate;
            if ((duplicate= unique_table(tab, select_tables)))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2842
            {
2843
              update_non_unique_table_error(tab, "CREATE", duplicate);
monty@mysql.com's avatar
monty@mysql.com committed
2844 2845
              res= 1;
              goto end_with_restart_wait;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2846 2847 2848
            }
          }
        }
2849

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2850 2851 2852 2853 2854
        if ((result= new select_create(create_table,
				       &lex->create_info,
				       lex->create_list,
				       lex->key_list,
				       select_lex->item_list,
2855 2856
				       lex->duplicates,
				       lex->ignore)))
2857 2858 2859 2860 2861
        {
          /*
            CREATE from SELECT give its SELECT_LEX for SELECT,
            and item_list belong to SELECT
          */
2862
          res= handle_select(thd, lex, result, 0);
2863
          delete result;
2864
        }
monty@mysql.com's avatar
monty@mysql.com committed
2865
	/* reset for PS */
2866 2867
	lex->create_list.empty();
	lex->key_list.empty();
2868 2869
      }
    }
monty@mysql.com's avatar
monty@mysql.com committed
2870
    else
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2871
    {
monty@mysql.com's avatar
monty@mysql.com committed
2872
      /* regular create */
venu@myvenu.com's avatar
venu@myvenu.com committed
2873
      if (lex->name)
monty@mysql.com's avatar
monty@mysql.com committed
2874
        res= mysql_create_like_table(thd, create_table, &lex->create_info, 
venu@myvenu.com's avatar
venu@myvenu.com committed
2875 2876
                                     (Table_ident *)lex->name); 
      else
2877
      {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2878
        res= mysql_create_table(thd, create_table->db,
2879
				create_table->table_name, &lex->create_info,
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2880
				lex->create_list,
monty@mysql.com's avatar
monty@mysql.com committed
2881
				lex->key_list, 0, 0);
2882
      }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2883
      if (!res)
2884
	send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2885
    }
2886

monty@mysql.com's avatar
monty@mysql.com committed
2887
end_with_restart_wait:
2888 2889 2890 2891 2892 2893
    /*
      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);

monty@mysql.com's avatar
monty@mysql.com committed
2894
    /* put tables back for PS rexecuting */
monty@mysql.com's avatar
monty@mysql.com committed
2895
end_with_restore_list:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2896
    lex->link_first_table_back(create_table, link_to_local);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2897
    break;
2898
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2899
  case SQLCOM_CREATE_INDEX:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2900 2901
    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
2902
      goto error; /* purecov: inspected */
2903
    thd->enable_slow_log= opt_log_slow_admin_statements;
2904
    if (end_active_trans(thd))
2905
      goto error;
2906
    else
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2907
      res = mysql_create_index(thd, first_table, lex->key_list);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2908 2909
    break;

2910
#ifdef HAVE_REPLICATION
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2911
  case SQLCOM_SLAVE_START:
2912
  {
2913
    pthread_mutex_lock(&LOCK_active_mi);
2914
    start_slave(thd,active_mi,1 /* net report*/);
2915
    pthread_mutex_unlock(&LOCK_active_mi);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2916
    break;
2917
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2918
  case SQLCOM_SLAVE_STOP:
2919 2920 2921 2922 2923 2924
  /*
    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,
2925
      so it waits for the client thread because t is locked by it.
2926
    - then the client thread does SLAVE STOP.
2927 2928
      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.
2929 2930 2931
    To prevent that, refuse SLAVE STOP if the
    client thread has locked tables
  */
2932
  if (thd->locked_tables || thd->active_transaction() || thd->global_read_lock)
2933
  {
2934 2935
    my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
               ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
2936
    goto error;
2937
  }
2938
  {
2939
    pthread_mutex_lock(&LOCK_active_mi);
2940
    stop_slave(thd,active_mi,1/* net report*/);
2941
    pthread_mutex_unlock(&LOCK_active_mi);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2942
    break;
2943
  }
2944
#endif /* HAVE_REPLICATION */
2945

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2946
  case SQLCOM_ALTER_TABLE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2947
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2948
#if defined(DONT_ALLOW_SHOW_COMMANDS)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2949 2950
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
2951
    goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2952 2953
#else
    {
2954
      ulong priv=0;
Sinisa@sinisa.nasamreza.org's avatar
Sinisa@sinisa.nasamreza.org committed
2955
      if (lex->name && (!lex->name[0] || strlen(lex->name) > NAME_LEN))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2956
      {
2957
	my_error(ER_WRONG_TABLE_NAME, MYF(0), lex->name);
2958
        goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2959
      }
2960
      if (!select_lex->db)
2961 2962 2963 2964 2965 2966 2967 2968 2969 2970
      {
        /*
          In the case of ALTER TABLE ... RENAME we should supply the
          default database if the new name is not explicitly qualified
          by a database. (Bug #11493)
        */
        if (lex->alter_info.flags & ALTER_RENAME)
        {
          if (! thd->db)
          {
ingo@mysql.com's avatar
ingo@mysql.com committed
2971
            my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
2972 2973 2974 2975 2976
            goto error;
          }
          select_lex->db= thd->db;
        }
        else
2977
          select_lex->db= first_table->db;
2978
      }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2979
      if (check_access(thd, ALTER_ACL, first_table->db,
2980 2981 2982 2983
		       &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
2984
	  check_merge_table_access(thd, first_table->db,
2985 2986 2987
				   (TABLE_LIST *)
				   lex->create_info.merge_list.first))
	goto error;				/* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2988 2989
      if (grant_option)
      {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2990
	if (check_grant(thd, ALTER_ACL, all_tables, 0, UINT_MAX, 0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2991 2992 2993 2994 2995
	  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));
2996
	  tmp_table.table_name=lex->name;
2997
	  tmp_table.db=select_lex->db;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2998
	  tmp_table.grant.privilege=priv;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2999 3000
	  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
3001 3002 3003
	    goto error;
	}
      }
3004 3005
      /* Don't yet allow changing of symlinks with ALTER TABLE */
      lex->create_info.data_file_name=lex->create_info.index_file_name=0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3006
      /* ALTER TABLE ends previous transaction */
3007
      if (end_active_trans(thd))
3008
	goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3009
      else
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3010
      {
3011
        thd->enable_slow_log= opt_log_slow_admin_statements;
3012
	res= mysql_alter_table(thd, select_lex->db, lex->name,
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3013
			       &lex->create_info,
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3014
			       first_table, lex->create_list,
3015
			       lex->key_list,
3016
			       select_lex->order_list.elements,
3017
                               (ORDER *) select_lex->order_list.first,
monty@mysql.com's avatar
monty@mysql.com committed
3018 3019
			       lex->duplicates, lex->ignore, &lex->alter_info,
                               1);
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3020
      }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3021 3022
      break;
    }
hf@deer.(none)'s avatar
hf@deer.(none) committed
3023
#endif /*DONT_ALLOW_SHOW_COMMANDS*/
3024
  case SQLCOM_RENAME_TABLE:
3025
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3026
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3027
    TABLE_LIST *table;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3028
    if (check_db_used(thd, all_tables))
3029
      goto error;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3030
    for (table= first_table; table; table= table->next_local->next_local)
3031
    {
monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
3032
      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
3033
		       &table->grant.privilege,0,0, test(table->schema_table)) ||
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3034
	  check_access(thd, INSERT_ACL | CREATE_ACL, table->next_local->db,
3035 3036
		       &table->next_local->grant.privilege, 0, 0,
                       test(table->next_local->schema_table)))
3037 3038 3039
	goto error;
      if (grant_option)
      {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3040
	TABLE_LIST old_list, new_list;
3041 3042 3043 3044
	/*
	  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
3045 3046 3047 3048
	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,
3049
			    INSERT_ACL | CREATE_ACL) &&
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3050
	     check_grant(thd, INSERT_ACL | CREATE_ACL, &new_list, 0, 1, 0)))
3051 3052 3053
	  goto error;
      }
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3054
    query_cache_invalidate3(thd, first_table, 0);
3055 3056
    if (end_active_trans(thd) || mysql_rename_tables(thd, first_table))
      goto error;
3057
    break;
3058
  }
3059
#ifndef EMBEDDED_LIBRARY
3060 3061
  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3062 3063
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
3064
    goto error;
3065 3066
#else
    {
3067
      if (check_global_access(thd, SUPER_ACL))
3068 3069 3070 3071
	goto error;
      res = show_binlogs(thd);
      break;
    }
peter@mysql.com's avatar
peter@mysql.com committed
3072
#endif
3073
#endif /* EMBEDDED_LIBRARY */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3074
  case SQLCOM_SHOW_CREATE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3075
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3076
#ifdef DONT_ALLOW_SHOW_COMMANDS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3077 3078
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
3079
    goto error;
3080
#else
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3081
    {
3082 3083 3084 3085
      /* Ignore temporary tables if this is "SHOW CREATE VIEW" */
      if (lex->only_view)
        first_table->skip_temporary= 1;

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3086 3087
      if (check_db_used(thd, all_tables) ||
	  check_access(thd, SELECT_ACL | EXTRA_ACL, first_table->db,
3088 3089
		       &first_table->grant.privilege, 0, 0, 
                       test(first_table->schema_table)))
3090
	goto error;
monty@mishka.local's avatar
monty@mishka.local committed
3091
      if (grant_option && check_grant(thd, SELECT_ACL, all_tables, 2, UINT_MAX, 0))
3092
	goto error;
monty@mishka.local's avatar
monty@mishka.local committed
3093
      res= mysqld_show_create(thd, first_table);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3094 3095
      break;
    }
3096
#endif
3097 3098
  case SQLCOM_CHECKSUM:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3099 3100 3101
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL | EXTRA_ACL, all_tables, 0))
3102
      goto error; /* purecov: inspected */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3103
    res = mysql_checksum_table(thd, first_table, &lex->check_opt);
3104 3105
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3106
  case SQLCOM_REPAIR:
3107
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3108 3109 3110
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
3111
      goto error; /* purecov: inspected */
3112
    thd->enable_slow_log= opt_log_slow_admin_statements;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3113
    res= mysql_repair_table(thd, first_table, &lex->check_opt);
3114 3115 3116 3117 3118
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      if (mysql_bin_log.is_open())
      {
3119
	thd->clear_error(); // No binlog error generated
3120
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3121 3122 3123
        mysql_bin_log.write(&qinfo);
      }
    }
3124 3125
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3126
  case SQLCOM_CHECK:
3127
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3128 3129 3130
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL | EXTRA_ACL , all_tables, 0))
3131
      goto error; /* purecov: inspected */
3132
    thd->enable_slow_log= opt_log_slow_admin_statements;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3133
    res = mysql_check_table(thd, first_table, &lex->check_opt);
3134 3135
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3136 3137
  case SQLCOM_ANALYZE:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3138 3139 3140
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3141
      goto error; /* purecov: inspected */
3142
    thd->enable_slow_log= opt_log_slow_admin_statements;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3143
    res = mysql_analyze_table(thd, first_table, &lex->check_opt);
3144 3145 3146 3147 3148
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      if (mysql_bin_log.is_open())
      {
3149
	thd->clear_error(); // No binlog error generated
3150
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3151 3152 3153
        mysql_bin_log.write(&qinfo);
      }
    }
3154
    break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3155
  }
3156

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3157 3158
  case SQLCOM_OPTIMIZE:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3159 3160 3161
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3162
      goto error; /* purecov: inspected */
3163
    thd->enable_slow_log= opt_log_slow_admin_statements;
3164
    res= (specialflag & (SPECIAL_SAFE_MODE | SPECIAL_NO_NEW_FUNC)) ?
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3165 3166
      mysql_recreate_table(thd, first_table, 1) :
      mysql_optimize_table(thd, first_table, &lex->check_opt);
3167 3168 3169 3170 3171
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      if (mysql_bin_log.is_open())
      {
3172
	thd->clear_error(); // No binlog error generated
3173
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3174 3175 3176
        mysql_bin_log.write(&qinfo);
      }
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3177 3178 3179
    break;
  }
  case SQLCOM_UPDATE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3180 3181
    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
3182
      break;
3183 3184
    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
3185 3186 3187 3188 3189 3190
    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,
3191
                               unit->select_limit_cnt,
3192
                               lex->duplicates, lex->ignore));
3193
    /* 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
3194
    if (result != 2)
3195
      break;
3196
  case SQLCOM_UPDATE_MULTI:
3197 3198 3199 3200
  {
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    /* if we switched from normal update, rights are checked */
    if (result != 2)
3201
    {
3202 3203 3204 3205 3206
      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
3207

3208 3209
    if ((res= mysql_multi_update_prepare(thd)))
      break;
3210

3211
#ifdef HAVE_REPLICATION
3212 3213 3214 3215 3216 3217 3218
    /* Check slave filtering rules */
    if (thd->slave_thread && all_tables_not_ok(thd, all_tables))
    {
      /* we warn the slave SQL thread */
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
      break;
    }
3219
#endif /* HAVE_REPLICATION */
3220

3221 3222 3223 3224 3225 3226
    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
3227
    break;
monty@mysql.com's avatar
monty@mysql.com committed
3228
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3229
  case SQLCOM_REPLACE:
3230 3231
  case SQLCOM_INSERT:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3232
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
monty@mysql.com's avatar
monty@mysql.com committed
3233
    if ((res= insert_precheck(thd, all_tables)))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3234
      break;
3235 3236
    /* Skip first table, which is the table we are inserting in */
    select_lex->context.table_list= first_table->next_local;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3237
    res= mysql_insert(thd, all_tables, lex->field_list, lex->many_values,
monty@mishka.local's avatar
monty@mishka.local committed
3238
		      lex->update_list, lex->value_list,
3239
                      lex->duplicates, lex->ignore);
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3240 3241
    if (first_table->view && !first_table->contain_auto_increment)
      thd->last_insert_id= 0; // do not show last insert ID if VIEW have not it
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3242
    break;
3243
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3244 3245 3246
  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
monty@mysql.com's avatar
monty@mysql.com committed
3247
    select_result *result;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3248
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
monty@mishka.local's avatar
monty@mishka.local committed
3249
    if ((res= insert_precheck(thd, all_tables)))
3250
      break;
monty@mysql.com's avatar
monty@mysql.com committed
3251

3252
    /* Fix lock for first table */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3253 3254
    if (first_table->lock_type == TL_WRITE_DELAYED)
      first_table->lock_type= TL_WRITE;
3255

3256 3257
    /* 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
3258

3259
    unit->set_limit(select_lex);
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3260
    if (!(res= open_and_lock_tables(thd, all_tables)))
3261
    {
3262
      /* Skip first table, which is the table we are inserting in */
3263 3264
      TABLE_LIST *second_table= first_table->next_local;
      select_lex->table_list.first= (byte*) second_table;
3265 3266
      select_lex->context.table_list= 
        select_lex->context.first_name_resolution_table= second_table;
3267 3268 3269
      res= mysql_insert_select_prepare(thd);
      if (!res && (result= new select_insert(first_table, first_table->table,
                                             &lex->field_list,
3270 3271
                                             &lex->update_list,
                                             &lex->value_list,
3272
                                             lex->duplicates, lex->ignore)))
3273
      {
3274 3275 3276 3277 3278 3279 3280
        /*
          Skip first table, which is the table we are inserting in.
          Below we set context.table_list again because the call above to
          mysql_insert_select_prepare() calls resolve_in_table_list_only(),
          which in turn resets context.table_list and
          context.first_name_resolution_table.
        */
3281 3282
        select_lex->context.table_list= 
          select_lex->context.first_name_resolution_table= second_table;
3283
	res= handle_select(thd, lex, result, OPTION_SETUP_TABLES_DONE);
3284 3285
        delete result;
      }
3286
      /* revert changes for SP */
msvensson@neptunus.(none)'s avatar
msvensson@neptunus.(none) committed
3287
      select_lex->table_list.first= (byte*) first_table;
3288
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3289 3290 3291

    if (first_table->view && !first_table->contain_auto_increment)
      thd->last_insert_id= 0; // do not show last insert ID if VIEW have not it
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3292 3293
    break;
  }
3294
  case SQLCOM_TRUNCATE:
3295 3296 3297 3298 3299
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3300 3301
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_one_table_access(thd, DELETE_ACL, all_tables))
3302
      goto error;
3303 3304 3305 3306
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
3307
    if ((thd->locked_tables && !lex->sphead) || thd->active_transaction())
3308
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3309 3310
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3311 3312
      goto error;
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3313

monty@mysql.com's avatar
monty@mysql.com committed
3314
    res= mysql_truncate(thd, first_table, 0);
3315
    break;
3316
  case SQLCOM_DELETE:
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3317
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3318 3319
    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
3320
      break;
3321 3322
    DBUG_ASSERT(select_lex->offset_limit == 0);
    unit->set_limit(select_lex);
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3323
    res = mysql_delete(thd, all_tables, select_lex->where,
3324
                       &select_lex->order_list,
osku@127.(none)'s avatar
osku@127.(none) committed
3325 3326
                       unit->select_limit_cnt, select_lex->options,
                       FALSE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3327 3328
    break;
  }
3329
  case SQLCOM_DELETE_MULTI:
3330
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3331
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3332 3333
    TABLE_LIST *aux_tables=
      (TABLE_LIST *)thd->lex->auxilliary_table_list.first;
3334
    multi_delete *result;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3335

3336
    if ((res= multi_delete_precheck(thd, all_tables)))
3337
      break;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3338

3339
    /* condition will be TRUE on SP re-excuting */
3340 3341
    if (select_lex->item_list.elements != 0)
      select_lex->item_list.empty();
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
3342
    if (add_item_to_list(thd, new Item_null()))
3343
      goto error;
3344

3345
    thd->proc_info="init";
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3346 3347 3348 3349
    if ((res= open_and_lock_tables(thd, all_tables)))
      break;

    if ((res= mysql_multi_delete_prepare(thd)))
3350
      goto error;
3351

3352
    if (!thd->is_fatal_error && (result= new multi_delete(aux_tables,
3353
							  lex->table_count)))
3354
    {
3355 3356 3357
      res= mysql_select(thd, &select_lex->ref_pointer_array,
			select_lex->get_table_list(),
			select_lex->with_wild,
3358
			select_lex->item_list,
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3359
			select_lex->where,
3360
			0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3361 3362
			(ORDER *)NULL,
			select_lex->options | thd->options |
3363 3364
			SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK |
                        OPTION_SETUP_TABLES_DONE,
3365
			result, unit, select_lex);
3366
      delete result;
3367 3368
    }
    else
3369
      res= TRUE;                                // Error
3370 3371
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3372
  case SQLCOM_DROP_TABLE:
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
3373
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3374
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3375 3376
    if (!lex->drop_temporary)
    {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3377
      if (check_table_access(thd, DROP_ACL, all_tables, 0))
3378 3379
	goto error;				/* purecov: inspected */
      if (end_active_trans(thd))
3380
        goto error;
3381
    }
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
3382
    else
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
3383 3384 3385 3386 3387 3388
    {
      /*
	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
3389 3390
	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
3391 3392 3393
      */
      if (thd->slave_thread)
	lex->drop_if_exists= 1;
3394

3395 3396
      /* So that DROP TEMPORARY TABLE gets to binlog at commit/rollback */
      thd->options|= OPTION_STATUS_NO_TRANS_UPDATE;
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
3397
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3398 3399
    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
3400 3401
  }
  break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3402
  case SQLCOM_DROP_INDEX:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3403 3404
    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
3405
      goto error;				/* purecov: inspected */
3406
    if (end_active_trans(thd))
3407
      goto error;
3408
    else
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3409
      res = mysql_drop_index(thd, first_table, &lex->alter_info);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3410 3411
    break;
  case SQLCOM_SHOW_PROCESSLIST:
3412 3413
    if (!thd->security_ctx->priv_user[0] &&
        check_global_access(thd,PROCESS_ACL))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3414
      break;
hf@deer.(none)'s avatar
hf@deer.(none) committed
3415
    mysqld_list_processes(thd,
3416 3417 3418 3419
			  (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
3420
    break;
3421 3422
  case SQLCOM_SHOW_STORAGE_ENGINES:
    res= mysqld_show_storage_engines(thd);
3423 3424 3425 3426 3427 3428 3429
    break;
  case SQLCOM_SHOW_PRIVILEGES:
    res= mysqld_show_privileges(thd);
    break;
  case SQLCOM_SHOW_COLUMN_TYPES:
    res= mysqld_show_column_types(thd);
    break;
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
3430 3431
  case SQLCOM_SHOW_LOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3432 3433
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0));	/* purecov: inspected */
3434
    goto error;
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
3435 3436
#else
    {
3437
      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
3438 3439 3440 3441
	goto error;
      res= mysqld_show_logs(thd);
      break;
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3442 3443
#endif
  case SQLCOM_CHANGE_DB:
3444 3445
    if (!mysql_change_db(thd,select_lex->db,FALSE))
      send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3446
    break;
3447

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3448 3449
  case SQLCOM_LOAD:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3450
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3451
    uint privilege= (lex->duplicates == DUP_REPLACE ?
3452 3453
		     INSERT_ACL | DELETE_ACL : INSERT_ACL) |
                    (lex->local_file ? 0 : FILE_ACL);
3454

3455
    if (lex->local_file)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3456
    {
3457
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
3458
          !opt_local_infile)
3459
      {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3460
	my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND), MYF(0));
3461 3462
	goto error;
      }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3463
    }
3464 3465 3466 3467

    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
3468
    res= mysql_load(thd, lex->exchange, first_table, lex->field_list,
3469
                    lex->update_list, lex->value_list, lex->duplicates,
3470
                    lex->ignore, (bool) lex->local_file);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3471 3472
    break;
  }
3473

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3474
  case SQLCOM_SET_OPTION:
3475 3476
  {
    List<set_var_base> *lex_var_list= &lex->var_list;
3477
    if ((check_table_access(thd, SELECT_ACL, all_tables, 0) ||
3478 3479
	 open_and_lock_tables(thd, all_tables)))
      goto error;
3480 3481
    if (lex->one_shot_set && not_all_support_one_shot(lex_var_list))
    {
3482 3483
      my_error(ER_RESERVED_SYNTAX, MYF(0), "SET ONE_SHOT");
      goto error;
3484 3485 3486 3487 3488 3489 3490 3491
    }
    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;
3492
      send_ok(thd);
3493
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3494
    break;
3495
  }
3496

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3497
  case SQLCOM_UNLOCK_TABLES:
3498 3499 3500 3501 3502 3503
    /*
      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.
    */
3504
    unlock_locked_tables(thd);
3505 3506
    if (thd->options & OPTION_TABLE_LOCK)
    {
3507
      end_active_trans(thd);
3508
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3509 3510
    }
    if (thd->global_read_lock)
3511
      unlock_global_read_lock(thd);
3512
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3513 3514
    break;
  case SQLCOM_LOCK_TABLES:
3515
    unlock_locked_tables(thd);
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3516
    if (check_db_used(thd, all_tables) || end_active_trans(thd))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3517
      goto error;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3518
    if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, all_tables, 0))
3519
      goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3520
    thd->in_lock_tables=1;
3521
    thd->options|= OPTION_TABLE_LOCK;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3522

3523
    if (!(res= simple_open_n_lock_tables(thd, all_tables)))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3524
    {
3525 3526
#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
3527
	query_cache.invalidate_locked_for_write(first_table);
3528
#endif /*HAVE_QUERY_CACHE*/
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3529 3530
      thd->locked_tables=thd->lock;
      thd->lock=0;
3531
      send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3532
    }
3533 3534
    else
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3535 3536 3537
    thd->in_lock_tables=0;
    break;
  case SQLCOM_CREATE_DB:
3538
  {
3539 3540 3541 3542 3543
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
3544
    char *alias;
vva@eagle.mysql.r18.ru's avatar
vva@eagle.mysql.r18.ru committed
3545
    if (!(alias=thd->strdup(lex->name)) || check_db_name(lex->name))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3546
    {
3547
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3548 3549
      break;
    }
3550 3551 3552
    /*
      If in a slave thread :
      CREATE DATABASE DB was certainly not preceded by USE DB.
3553
      For that reason, db_ok() in sql/slave.cc did not check the
3554 3555 3556
      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.
    */
3557
#ifdef HAVE_REPLICATION
3558
    if (thd->slave_thread &&
3559 3560
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3561
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3562
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
3563
      break;
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3564
    }
3565
#endif
3566
    if (check_access(thd,CREATE_ACL,lex->name,0,1,0,is_schema_db(lex->name)))
3567
      break;
monty@mysql.com's avatar
monty@mysql.com committed
3568
    res= mysql_create_db(thd,(lower_case_table_names == 2 ? alias : lex->name),
monty@mysql.com's avatar
monty@mysql.com committed
3569
			 &lex->create_info, 0);
3570 3571
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3572
  case SQLCOM_DROP_DB:
3573
  {
3574 3575 3576 3577 3578
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
3579
    if (check_db_name(lex->name))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3580
    {
3581
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3582 3583
      break;
    }
3584 3585 3586 3587 3588 3589 3590
    /*
      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.
    */
3591
#ifdef HAVE_REPLICATION
3592 3593 3594
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3595
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3596
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
3597
      break;
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3598
    }
3599
#endif
3600
    if (check_access(thd,DROP_ACL,lex->name,0,1,0,is_schema_db(lex->name)))
3601
      break;
3602 3603
    if (thd->locked_tables || thd->active_transaction())
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3604 3605
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3606 3607
      goto error;
    }
3608
    res= mysql_rm_db(thd, lex->name, lex->drop_if_exists, 0);
3609 3610
    break;
  }
3611 3612
  case SQLCOM_ALTER_DB:
  {
3613 3614
    char *db= lex->name ? lex->name : thd->db;
    if (!db)
3615
    {
monty@mishka.local's avatar
monty@mishka.local committed
3616 3617
      my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
      break;
3618 3619
    }
    if (!strip_sp(db) || check_db_name(db))
3620
    {
3621
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
3622 3623
      break;
    }
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3624 3625 3626
    /*
      If in a slave thread :
      ALTER DATABASE DB may not be preceded by USE DB.
3627
      For that reason, maybe db_ok() in sql/slave.cc did not check the
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3628 3629 3630 3631
      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
3632
    if (thd->slave_thread &&
3633 3634
	(!db_ok(db, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(db)))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3635
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3636
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3637 3638 3639
      break;
    }
#endif
3640
    if (check_access(thd, ALTER_ACL, db, 0, 1, 0, is_schema_db(db)))
3641 3642 3643
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3644 3645
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3646 3647
      goto error;
    }
3648
    res= mysql_alter_db(thd, db, &lex->create_info);
3649 3650
    break;
  }
3651 3652 3653 3654
  case SQLCOM_SHOW_CREATE_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
3655
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
3656 3657
      break;
    }
3658
    if (check_access(thd,SELECT_ACL,lex->name,0,1,0,is_schema_db(lex->name)))
3659
      break;
3660
    res=mysqld_show_create_db(thd,lex->name,&lex->create_info);
3661 3662
    break;
  }
monty@mysql.com's avatar
monty@mysql.com committed
3663
  case SQLCOM_CREATE_FUNCTION:                  // UDF function
monty@mysql.com's avatar
monty@mysql.com committed
3664
  {
3665
    if (check_access(thd,INSERT_ACL,"mysql",0,1,0,0))
monty@mysql.com's avatar
monty@mysql.com committed
3666
      break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3667
#ifdef HAVE_DLOPEN
3668
    if (sp_find_function(thd, lex->spname))
monty@mysql.com's avatar
monty@mysql.com committed
3669
    {
3670
      my_error(ER_UDF_EXISTS, MYF(0), lex->spname->m_name.str);
monty@mysql.com's avatar
monty@mysql.com committed
3671 3672
      goto error;
    }
3673
    if (!(res = mysql_create_function(thd, &lex->udf)))
monty@mysql.com's avatar
monty@mysql.com committed
3674
      send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3675
#else
hf@deer.(none)'s avatar
hf@deer.(none) committed
3676
    my_error(ER_CANT_OPEN_LIBRARY, MYF(0), lex->udf.dl, 0, "feature disabled");
3677
    res= TRUE;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3678 3679
#endif
    break;
monty@mysql.com's avatar
monty@mysql.com committed
3680
  }
hf@deer.(none)'s avatar
hf@deer.(none) committed
3681
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3682 3683
  case SQLCOM_CREATE_USER:
  {
3684
    if (check_access(thd, INSERT_ACL, "mysql", 0, 1, 1, 0) &&
3685
        check_global_access(thd,CREATE_USER_ACL))
3686
      break;
3687 3688
    if (end_active_trans(thd))
      goto error;
3689 3690 3691 3692
    if (!(res= mysql_create_user(thd, lex->users_list)))
    {
      if (mysql_bin_log.is_open())
      {
monty@mysql.com's avatar
monty@mysql.com committed
3693
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3694 3695 3696 3697 3698 3699
        mysql_bin_log.write(&qinfo);
      }
      send_ok(thd);
    }
    break;
  }
3700 3701
  case SQLCOM_DROP_USER:
  {
3702
    if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 1, 0) &&
3703
        check_global_access(thd,CREATE_USER_ACL))
3704
      break;
3705 3706
    if (end_active_trans(thd))
      goto error;
3707 3708 3709 3710
    if (!(res= mysql_drop_user(thd, lex->users_list)))
    {
      if (mysql_bin_log.is_open())
      {
monty@mysql.com's avatar
monty@mysql.com committed
3711
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3712 3713 3714 3715 3716 3717 3718 3719
        mysql_bin_log.write(&qinfo);
      }
      send_ok(thd);
    }
    break;
  }
  case SQLCOM_RENAME_USER:
  {
3720
    if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1, 0) &&
3721
        check_global_access(thd,CREATE_USER_ACL))
3722
      break;
3723 3724
    if (end_active_trans(thd))
      goto error;
3725 3726 3727 3728
    if (!(res= mysql_rename_user(thd, lex->users_list)))
    {
      if (mysql_bin_log.is_open())
      {
monty@mysql.com's avatar
monty@mysql.com committed
3729
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3730
        mysql_bin_log.write(&qinfo);
3731 3732 3733 3734 3735 3736 3737
      }
      send_ok(thd);
    }
    break;
  }
  case SQLCOM_REVOKE_ALL:
  {
3738
    if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1, 0) &&
3739
        check_global_access(thd,CREATE_USER_ACL))
3740 3741 3742 3743 3744
      break;
    if (!(res = mysql_revoke_all(thd, lex->users_list)))
    {
      if (mysql_bin_log.is_open())
      {
3745
	Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3746 3747 3748 3749 3750 3751
	mysql_bin_log.write(&qinfo);
      }
      send_ok(thd);
    }
    break;
  }
3752 3753 3754 3755
  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
3756
		     first_table ?  first_table->db : select_lex->db,
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3757
		     first_table ? &first_table->grant.privilege : 0,
3758 3759 3760
		     first_table ? 0 : 1, 0,
                     first_table ? (bool) first_table->schema_table :
                     select_lex->db ? is_schema_db(select_lex->db) : 0))
3761 3762
      goto error;

3763
    if (thd->security_ctx->user)              // If not replication
3764 3765
    {
      LEX_USER *user;
3766 3767
      uint counter;

3768
      List_iterator <LEX_USER> user_list(lex->users_list);
3769
      while ((user= user_list++))
3770
      {
3771 3772 3773 3774 3775 3776 3777 3778
        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);
3779
        if (strcmp(thd->security_ctx->user, user->user.str) ||
3780
            my_strcasecmp(system_charset_info,
3781
                          user->host.str, thd->security_ctx->host_or_ip))
3782 3783 3784
        {
          // TODO: use check_change_password()
          if (check_acl_user(user, &counter) && user->password.str &&
3785
              check_access(thd, UPDATE_ACL,"mysql",0,1,1,0))
3786 3787 3788 3789 3790 3791
          {
            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
3792 3793
      }
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3794
    if (first_table)
3795
    {
3796 3797
      if (lex->type == TYPE_ENUM_PROCEDURE ||
          lex->type == TYPE_ENUM_FUNCTION)
3798 3799 3800 3801 3802
      {
        uint grants= lex->all_privileges 
		   ? (PROC_ACLS & ~GRANT_ACL) | (lex->grant & GRANT_ACL)
		   : lex->grant;
        if (grant_option && 
3803 3804
	    check_grant_routine(thd, grants | GRANT_ACL, all_tables,
                                lex->type == TYPE_ENUM_PROCEDURE, 0))
3805
	  goto error;
3806 3807 3808 3809
        res= mysql_routine_grant(thd, all_tables,
                                 lex->type == TYPE_ENUM_PROCEDURE, 
                                 lex->users_list, grants,
                                 lex->sql_command == SQLCOM_REVOKE, 0);
3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822
      }
      else
      {
	if (grant_option && check_grant(thd,
					(lex->grant | lex->grant_tot_col |
					 GRANT_ACL),
					all_tables, 0, UINT_MAX, 0))
	  goto error;
        res= mysql_table_grant(thd, all_tables, lex->users_list,
			       lex->columns, lex->grant,
			       lex->sql_command == SQLCOM_REVOKE);
      }
      if (!res && mysql_bin_log.is_open())
3823
      {
pem@mysql.com's avatar
pem@mysql.com committed
3824
        thd->clear_error();
monty@mysql.com's avatar
monty@mysql.com committed
3825
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3826
        mysql_bin_log.write(&qinfo);
3827 3828 3829 3830
      }
    }
    else
    {
3831
      if (lex->columns.elements || lex->type)
3832
      {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3833 3834
	my_message(ER_ILLEGAL_GRANT_FOR_TABLE, ER(ER_ILLEGAL_GRANT_FOR_TABLE),
                   MYF(0));
3835
        goto error;
3836 3837 3838 3839 3840 3841 3842 3843
      }
      else
	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
			  lex->sql_command == SQLCOM_REVOKE);
      if (!res)
      {
	if (mysql_bin_log.is_open())
	{
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3844
          thd->clear_error();
3845
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3846 3847
	  mysql_bin_log.write(&qinfo);
	}
3848
	if (lex->sql_command == SQLCOM_GRANT)
3849
	{
3850 3851 3852
	  List_iterator <LEX_USER> str_list(lex->users_list);
	  LEX_USER *user;
	  while ((user=str_list++))
monty@mysql.com's avatar
monty@mysql.com committed
3853
	    reset_mqh(user);
3854
	}
3855 3856 3857 3858
      }
    }
    break;
  }
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
3859
#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/
monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
3860
  case SQLCOM_RESET:
3861 3862 3863
    /*
      RESET commands are never written to the binary log, so we have to
      initialize this variable because RESET shares the same code as FLUSH
3864 3865 3866 3867
    */
    lex->no_write_to_binlog= 1;
  case SQLCOM_FLUSH:
  {
3868
    bool write_to_binlog;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3869
    if (check_global_access(thd,RELOAD_ACL) || check_db_used(thd, all_tables))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3870
      goto error;
3871 3872 3873 3874
    /*
      reload_acl_and_cache() will tell us if we are allowed to write to the
      binlog or not.
    */
3875
    if (!reload_acl_and_cache(thd, lex->type, first_table, &write_to_binlog))
3876 3877 3878 3879 3880 3881 3882 3883 3884
    {
      /*
        We WANT to write and we CAN write.
        ! we write after unlocking the table.
      */
      if (!lex->no_write_to_binlog && write_to_binlog)
      {
        if (mysql_bin_log.is_open())
        {
3885
          Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3886 3887 3888 3889 3890
          mysql_bin_log.write(&qinfo);
        }
      }
      send_ok(thd);
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3891
    break;
3892
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3893
  case SQLCOM_KILL:
3894 3895 3896
  {
    Item *it= (Item *)lex->value_list.head();

3897
    if ((!it->fixed && it->fix_fields(lex->thd, &it)) || it->check_cols(1))
3898 3899 3900 3901 3902 3903
    {
      my_message(ER_SET_CONSTANTS_ONLY, ER(ER_SET_CONSTANTS_ONLY),
		 MYF(0));
      goto error;
    }
    kill_one_thread(thd, (ulong)it->val_int(), lex->type & ONLY_KILL_QUERY);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3904
    break;
3905
  }
hf@deer.(none)'s avatar
hf@deer.(none) committed
3906
#ifndef NO_EMBEDDED_ACCESS_CHECKS
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3907
  case SQLCOM_SHOW_GRANTS:
3908 3909
    if ((thd->security_ctx->priv_user &&
	 !strcmp(thd->security_ctx->priv_user, lex->grant_user->user.str)) ||
3910
	!check_access(thd, SELECT_ACL, "mysql",0,1,0,0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3911 3912 3913 3914
    {
      res = mysql_show_grants(thd,lex->grant_user);
    }
    break;
hf@deer.(none)'s avatar
hf@deer.(none) committed
3915
#endif
3916
  case SQLCOM_HA_OPEN:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3917 3918 3919
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL, all_tables, 0))
3920
      goto error;
monty@mysql.com's avatar
monty@mysql.com committed
3921
    res= mysql_ha_open(thd, first_table, 0);
3922 3923
    break;
  case SQLCOM_HA_CLOSE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3924 3925
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables))
3926
      goto error;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3927
    res= mysql_ha_close(thd, first_table);
3928 3929
    break;
  case SQLCOM_HA_READ:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3930
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3931 3932 3933 3934 3935
    /*
      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.
    */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3936
    if (check_db_used(thd, all_tables))
3937
      goto error;
3938
    unit->set_limit(select_lex);
3939
    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
3940
                       lex->insert_list, lex->ha_rkey_mode, select_lex->where,
3941
                       unit->select_limit_cnt, unit->offset_limit_cnt);
3942 3943
    break;

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3944
  case SQLCOM_BEGIN:
3945 3946 3947 3948 3949 3950
    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;
    }
3951
    if (begin_trans(thd))
3952
      goto error;
serg@serg.mylan's avatar
serg@serg.mylan committed
3953
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3954 3955
    break;
  case SQLCOM_COMMIT:
3956
    if (end_trans(thd, lex->tx_release ? COMMIT_RELEASE :
serg@serg.mylan's avatar
serg@serg.mylan committed
3957
                              lex->tx_chain ? COMMIT_AND_CHAIN : COMMIT))
3958
      goto error;
3959
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3960 3961
    break;
  case SQLCOM_ROLLBACK:
3962
    if (end_trans(thd, lex->tx_release ? ROLLBACK_RELEASE :
serg@serg.mylan's avatar
serg@serg.mylan committed
3963
                              lex->tx_chain ? ROLLBACK_AND_CHAIN : ROLLBACK))
3964
      goto error;
3965
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3966
    break;
serg@serg.mylan's avatar
serg@serg.mylan committed
3967
  case SQLCOM_RELEASE_SAVEPOINT:
serg@serg.mylan's avatar
serg@serg.mylan committed
3968
  {
3969 3970
    SAVEPOINT *sv;
    for (sv=thd->transaction.savepoints; sv; sv=sv->prev)
serg@serg.mylan's avatar
serg@serg.mylan committed
3971 3972 3973
    {
      if (my_strnncoll(system_charset_info,
                       (uchar *)lex->ident.str, lex->ident.length,
3974
                       (uchar *)sv->name, sv->length) == 0)
serg@serg.mylan's avatar
serg@serg.mylan committed
3975 3976
        break;
    }
3977
    if (sv)
serg@serg.mylan's avatar
serg@serg.mylan committed
3978
    {
3979
      if (ha_release_savepoint(thd, sv))
serg@serg.mylan's avatar
serg@serg.mylan committed
3980
        res= TRUE; // cannot happen
serg@serg.mylan's avatar
serg@serg.mylan committed
3981 3982
      else
        send_ok(thd);
3983
      thd->transaction.savepoints=sv->prev;
serg@serg.mylan's avatar
serg@serg.mylan committed
3984
    }
3985
    else
serg@serg.mylan's avatar
serg@serg.mylan committed
3986
      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3987
    break;
serg@serg.mylan's avatar
serg@serg.mylan committed
3988
  }
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3989
  case SQLCOM_ROLLBACK_TO_SAVEPOINT:
serg@serg.mylan's avatar
serg@serg.mylan committed
3990
  {
3991 3992
    SAVEPOINT *sv;
    for (sv=thd->transaction.savepoints; sv; sv=sv->prev)
3993 3994 3995
    {
      if (my_strnncoll(system_charset_info,
                       (uchar *)lex->ident.str, lex->ident.length,
3996
                       (uchar *)sv->name, sv->length) == 0)
3997 3998
        break;
    }
3999
    if (sv)
4000
    {
4001
      if (ha_rollback_to_savepoint(thd, sv))
4002 4003
        res= TRUE; // cannot happen
      else
serg@serg.mylan's avatar
serg@serg.mylan committed
4004 4005 4006 4007 4008 4009 4010 4011
      {
        if ((thd->options & OPTION_STATUS_NO_TRANS_UPDATE) &&
            !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);
      }
4012
      thd->transaction.savepoints=sv;
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
4013 4014
    }
    else
4015
      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
4016
    break;
4017
  }
4018
  case SQLCOM_SAVEPOINT:
4019 4020
    if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) ||
        !opt_using_transactions)
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
4021
      send_ok(thd);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
4022
    else
4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060
    {
      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);
      }
    }
4061
    break;
4062 4063
  case SQLCOM_CREATE_PROCEDURE:
  case SQLCOM_CREATE_SPFUNCTION:
monty@mysql.com's avatar
monty@mysql.com committed
4064
  {
4065
    uint namelen;
4066
    char *name, *db;
4067
    int result;
4068

4069
    DBUG_ASSERT(lex->sphead != 0);
4070

4071 4072
    if (check_access(thd, CREATE_PROC_ACL, lex->sphead->m_db.str, 0, 0, 0,
                     is_schema_db(lex->sphead->m_db.str)))
4073 4074 4075 4076 4077 4078
    {
      delete lex->sphead;
      lex->sphead= 0;
      goto error;
    }

4079 4080 4081
    if (end_active_trans(thd)) 
      goto error;

4082 4083 4084
    if (!lex->sphead->m_db.str || !lex->sphead->m_db.str[0])
    {
      lex->sphead->m_db.length= strlen(thd->db);
serg@serg.mylan's avatar
serg@serg.mylan committed
4085 4086
      lex->sphead->m_db.str= strmake_root(thd->mem_root, thd->db,
                                           lex->sphead->m_db.length);
4087
    }
4088 4089

    name= lex->sphead->name(&namelen);
4090
#ifdef HAVE_DLOPEN
monty@mysql.com's avatar
monty@mysql.com committed
4091 4092 4093
    if (lex->sphead->m_type == TYPE_ENUM_FUNCTION)
    {
      udf_func *udf = find_udf(name, namelen);
4094

monty@mysql.com's avatar
monty@mysql.com committed
4095
      if (udf)
4096
      {
4097
	my_error(ER_UDF_EXISTS, MYF(0), name);
4098
	delete lex->sphead;
4099
	lex->sphead= 0;
4100
	goto error;
4101
      }
monty@mysql.com's avatar
monty@mysql.com committed
4102 4103 4104
    }
#endif
    if (lex->sphead->m_type == TYPE_ENUM_FUNCTION &&
4105
	!(lex->sphead->m_flags & sp_head::HAS_RETURN))
monty@mysql.com's avatar
monty@mysql.com committed
4106
    {
4107
      my_error(ER_SP_NORETURN, MYF(0), name);
monty@mysql.com's avatar
monty@mysql.com committed
4108
      delete lex->sphead;
4109
      lex->sphead= 0;
monty@mysql.com's avatar
monty@mysql.com committed
4110 4111 4112
      goto error;
    }

4113 4114
    name= thd->strdup(name); 
    db= thd->strmake(lex->sphead->m_db.str, lex->sphead->m_db.length);
4115
    res= (result= lex->sphead->create(thd));
4116 4117
    if (result == SP_OK)
    {
4118
      lex->unit.cleanup();
monty@mysql.com's avatar
monty@mysql.com committed
4119 4120
      delete lex->sphead;
      lex->sphead= 0;
4121
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4122
      /* only add privileges if really neccessary */
4123
      if (sp_automatic_privileges && !opt_noacl &&
4124 4125 4126
          check_routine_access(thd, DEFAULT_CREATE_PROC_ACLS,
      			       db, name,
                               lex->sql_command == SQLCOM_CREATE_PROCEDURE, 1))
4127 4128
      {
        close_thread_tables(thd);
4129 4130
        if (sp_grant_privileges(thd, db, name, 
                                lex->sql_command == SQLCOM_CREATE_PROCEDURE))
4131 4132 4133 4134
          push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 
	  	       ER_PROC_AUTO_GRANT_FAIL,
		       ER(ER_PROC_AUTO_GRANT_FAIL));
      }
4135
#endif
4136
      send_ok(thd);
4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156
    }
    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;
      }
4157
      lex->unit.cleanup();
monty@mysql.com's avatar
monty@mysql.com committed
4158 4159 4160
      delete lex->sphead;
      lex->sphead= 0;
      goto error;
4161
    }
monty@mysql.com's avatar
monty@mysql.com committed
4162 4163
    break;
  }
4164 4165 4166 4167
  case SQLCOM_CALL:
    {
      sp_head *sp;

4168 4169 4170 4171 4172 4173 4174 4175 4176
      /*
        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;

      /*
4177 4178
        By this moment all needed SPs should be in cache so no need to look 
        into DB. 
4179 4180
      */
      if (!(sp= sp_find_procedure(thd, lex->spname, TRUE)))
4181
      {
4182
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "PROCEDURE",
4183
                 lex->spname->m_qname.str);
4184
	goto error;
4185 4186 4187
      }
      else
      {
4188
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4189
	Security_context *save_ctx;
4190
#endif
pem@mysql.comhem.se's avatar
pem@mysql.comhem.se committed
4191
	ha_rows select_limit;
monty@mysql.com's avatar
monty@mysql.com committed
4192 4193
        /* bits that should be cleared in thd->server_status */
	uint bits_to_be_cleared= 0;
4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205
        /*
          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;
        }
4206

4207
#ifndef EMBEDDED_LIBRARY
4208 4209
	my_bool nsok= thd->net.no_send_ok;
	thd->net.no_send_ok= TRUE;
4210
#endif
4211
	if (sp->m_flags & sp_head::MULTI_RESULTS)
4212
	{
4213
	  if (! (thd->client_capabilities & CLIENT_MULTI_RESULTS))
4214
	  {
4215 4216 4217 4218
            /*
              The client does not support multiple result sets being sent
              back
            */
4219
	    my_error(ER_SP_BADSELECT, MYF(0), sp->m_qname.str);
4220 4221 4222 4223 4224
#ifndef EMBEDDED_LIBRARY
	    thd->net.no_send_ok= nsok;
#endif
	    goto error;
	  }
monty@mysql.com's avatar
monty@mysql.com committed
4225 4226 4227 4228 4229 4230 4231
          /*
            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;
4232 4233
	}

4234
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4235 4236 4237
	if (check_routine_access(thd, EXECUTE_ACL,
				 sp->m_db.str, sp->m_name.str, TRUE, 0) ||
          sp_change_security_context(thd, sp, &save_ctx))
4238 4239 4240 4241 4242 4243
	{
#ifndef EMBEDDED_LIBRARY
	  thd->net.no_send_ok= nsok;
#endif
	  goto error;
	}
4244 4245 4246
	if (save_ctx &&
            check_routine_access(thd, EXECUTE_ACL,
                                 sp->m_db.str, sp->m_name.str, TRUE, 0))
4247 4248 4249 4250
	{
#ifndef EMBEDDED_LIBRARY
	  thd->net.no_send_ok= nsok;
#endif
4251
	  sp_restore_security_context(thd, save_ctx);
4252 4253 4254
	  goto error;
	}

4255
#endif
pem@mysql.comhem.se's avatar
pem@mysql.comhem.se committed
4256 4257
	select_limit= thd->variables.select_limit;
	thd->variables.select_limit= HA_POS_ERROR;
4258

4259
        thd->row_count_func= 0;
4260 4261
        
        /* 
4262
          We never write CALL statements into binlog:
4263 4264 4265 4266 4267
           - 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.
4268
        */
4269
	res= sp->execute_procedure(thd, &lex->value_list);
4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280
        if (mysql_bin_log.is_open() &&
            (sp->m_chistics->daccess == SP_CONTAINS_SQL ||
             sp->m_chistics->daccess == SP_MODIFIES_SQL_DATA))
        {
          if (res)
            push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                         ER_FAILED_ROUTINE_BREAK_BINLOG,
			 ER(ER_FAILED_ROUTINE_BREAK_BINLOG));
          else
            thd->clear_error();
        }
4281

4282 4283 4284
	/*
          If warnings have been cleared, we have to clear total_warn_count
          too, otherwise the clients get confused.
4285 4286 4287 4288
	 */
	if (thd->warn_list.is_empty())
	  thd->total_warn_count= 0;

pem@mysql.comhem.se's avatar
pem@mysql.comhem.se committed
4289
	thd->variables.select_limit= select_limit;
4290
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4291
	sp_restore_security_context(thd, save_ctx);
4292
#endif
4293

4294
#ifndef EMBEDDED_LIBRARY
4295
	thd->net.no_send_ok= nsok;
4296
#endif
monty@mysql.com's avatar
monty@mysql.com committed
4297
        thd->server_status&= ~bits_to_be_cleared;
4298

4299
	if (!res)
monty@mysql.com's avatar
monty@mysql.com committed
4300 4301
	  send_ok(thd, (ulong) (thd->row_count_func < 0 ? 0 :
                                thd->row_count_func));
4302 4303
	else
	  goto error;		// Substatement should already have sent error
4304
      }
4305
      break;
4306 4307
    }
  case SQLCOM_ALTER_PROCEDURE:
4308
  case SQLCOM_ALTER_FUNCTION:
4309
    {
4310
      int result;
4311 4312 4313 4314
      sp_head *sp;
      st_sp_chistics chistics;

      memcpy(&chistics, &lex->sp_chistics, sizeof(chistics));
4315
      if (lex->sql_command == SQLCOM_ALTER_PROCEDURE)
4316
	sp= sp_find_procedure(thd, lex->spname);
4317
      else
4318
	sp= sp_find_function(thd, lex->spname);
monty@mysql.com's avatar
monty@mysql.com committed
4319
      mysql_reset_errors(thd, 0);
4320
      if (! sp)
4321 4322 4323 4324 4325 4326 4327 4328 4329
      {
	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;
	}
      }
4330 4331
      else
      {
4332 4333 4334
        if (check_routine_access(thd, ALTER_PROC_ACL, sp->m_db.str, 
				 sp->m_name.str,
                                 lex->sql_command == SQLCOM_ALTER_PROCEDURE, 0))
4335
	  goto error;
4336 4337 4338

        if (end_active_trans(thd)) 
          goto error;
4339
	memcpy(&lex->sp_chistics, &chistics, sizeof(lex->sp_chistics));
4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355
        if (!trust_routine_creators &&  mysql_bin_log.is_open() &&
            !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
        {
          if (lex->sql_command == SQLCOM_ALTER_PROCEDURE)
            result= sp_update_procedure(thd, lex->spname, &lex->sp_chistics);
          else
            result= sp_update_function(thd, lex->spname, &lex->sp_chistics);
        }
4356
      }
4357
      switch (result)
4358
      {
4359
      case SP_OK:
4360 4361 4362 4363 4364 4365
        if (mysql_bin_log.is_open())
        {
          thd->clear_error();
          Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
          mysql_bin_log.write(&qinfo);
        }
4366
	send_ok(thd);
4367 4368
	break;
      case SP_KEY_NOT_FOUND:
4369 4370
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4371 4372
	goto error;
      default:
4373 4374
	my_error(ER_SP_CANT_ALTER, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4375
	goto error;
4376
      }
4377
      break;
4378 4379
    }
  case SQLCOM_DROP_PROCEDURE:
4380
  case SQLCOM_DROP_FUNCTION:
4381
    {
4382
      sp_head *sp;
4383
      int result;
4384
      char *db, *name;
4385

4386
      if (lex->sql_command == SQLCOM_DROP_PROCEDURE)
4387 4388 4389
	sp= sp_find_procedure(thd, lex->spname);
      else
	sp= sp_find_function(thd, lex->spname);
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monty@mysql.com committed
4390
      mysql_reset_errors(thd, 0);
4391
      if (sp)
4392
      {
4393 4394
        db= thd->strdup(sp->m_db.str);
	name= thd->strdup(sp->m_name.str);
4395 4396
	if (check_routine_access(thd, ALTER_PROC_ACL, db, name,
                                 lex->sql_command == SQLCOM_DROP_PROCEDURE, 0))
bell@sanja.is.com.ua's avatar
merge  
bell@sanja.is.com.ua committed
4397
          goto error;
4398 4399 4400

        if (end_active_trans(thd)) 
          goto error;
4401
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4402
	if (sp_automatic_privileges && !opt_noacl &&
4403 4404
	    sp_revoke_privileges(thd, db, name, 
                                 lex->sql_command == SQLCOM_DROP_PROCEDURE))
4405 4406 4407 4408 4409
	{
	  push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 
		       ER_PROC_AUTO_REVOKE_FAIL,
		       ER(ER_PROC_AUTO_REVOKE_FAIL));
	}
4410
#endif
4411
	if (lex->sql_command == SQLCOM_DROP_PROCEDURE)
bell@sanja.is.com.ua's avatar
merge  
bell@sanja.is.com.ua committed
4412
	  result= sp_drop_procedure(thd, lex->spname);
4413
	else
bell@sanja.is.com.ua's avatar
merge  
bell@sanja.is.com.ua committed
4414
	  result= sp_drop_function(thd, lex->spname);
4415 4416 4417
      }
      else
      {
4418
#ifdef HAVE_DLOPEN
4419 4420 4421 4422 4423 4424
	if (lex->sql_command == SQLCOM_DROP_FUNCTION)
	{
          udf_func *udf = find_udf(lex->spname->m_name.str,
                                   lex->spname->m_name.length);
          if (udf)
          {
4425
	    if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 0, 0))
4426 4427
	      goto error;
	    if (!(res = mysql_drop_function(thd, &lex->spname->m_name)))
4428
	    {
4429 4430
	      send_ok(thd);
	      break;
4431 4432
	    }
	  }
4433
	}
4434
#endif
4435 4436 4437 4438 4439 4440 4441
	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;
	}
4442
      }
4443 4444
      res= result;
      switch (result)
4445 4446
      {
      case SP_OK:
4447 4448 4449 4450 4451 4452
        if (mysql_bin_log.is_open())
        {
          thd->clear_error();
          Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
          mysql_bin_log.write(&qinfo);
        }
4453
	send_ok(thd);
4454 4455
	break;
      case SP_KEY_NOT_FOUND:
4456 4457
	if (lex->drop_if_exists)
	{
4458
	  push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
4459
			      ER_SP_DOES_NOT_EXIST, ER(ER_SP_DOES_NOT_EXIST),
4460
			      SP_COM_STRING(lex), lex->spname->m_name.str);
4461
	  res= FALSE;
4462 4463 4464
	  send_ok(thd);
	  break;
	}
4465 4466
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4467 4468
	goto error;
      default:
4469 4470
	my_error(ER_SP_DROP_FAILED, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4471
	goto error;
4472
      }
4473
      break;
4474
    }
4475 4476
  case SQLCOM_SHOW_CREATE_PROC:
    {
4477
      if (lex->spname->m_name.length > NAME_LEN)
4478
      {
4479
	my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str);
4480 4481
	goto error;
      }
4482
      if (sp_show_create_procedure(thd, lex->spname) != SP_OK)
4483
      {			/* We don't distinguish between errors for now */
4484 4485
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
4486 4487 4488 4489 4490 4491
	goto error;
      }
      break;
    }
  case SQLCOM_SHOW_CREATE_FUNC:
    {
4492
      if (lex->spname->m_name.length > NAME_LEN)
4493
      {
4494
	my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str);
4495 4496
	goto error;
      }
4497
      if (sp_show_create_function(thd, lex->spname) != SP_OK)
4498
      {			/* We don't distinguish between errors for now */
4499 4500
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
4501 4502 4503 4504 4505 4506
	goto error;
      }
      break;
    }
  case SQLCOM_SHOW_STATUS_PROC:
    {
4507
      res= sp_show_status_procedure(thd, (lex->wild ?
4508 4509 4510 4511 4512
					  lex->wild->ptr() : NullS));
      break;
    }
  case SQLCOM_SHOW_STATUS_FUNC:
    {
4513
      res= sp_show_status_function(thd, (lex->wild ? 
4514 4515 4516
					 lex->wild->ptr() : NullS));
      break;
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4517 4518
  case SQLCOM_CREATE_VIEW:
    {
4519 4520 4521
      if (end_active_trans(thd))
        goto error;

4522 4523 4524
      if (!(res= mysql_create_view(thd, thd->lex->create_view_mode)) &&
          mysql_bin_log.is_open())
      {
4525
        String buff;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4526 4527 4528 4529
        const LEX_STRING command[3]=
          {{(char *)STRING_WITH_LEN("CREATE ")},
           {(char *)STRING_WITH_LEN("ALTER ")},
           {(char *)STRING_WITH_LEN("CREATE OR REPLACE ")}};
4530
        thd->clear_error();
4531 4532 4533 4534 4535

        buff.append(command[thd->lex->create_view_mode].str,
                    command[thd->lex->create_view_mode].length);
        view_store_options(thd, first_table, &buff);
        buff.append("VIEW ", 5);
4536 4537
        /* Test if user supplied a db (ie: we did not use thd->db) */
        if (first_table->db != thd->db && first_table->db[0])
4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548
        {
          append_identifier(thd, &buff, first_table->db,
                            first_table->db_length);
          buff.append('.');
        }
        append_identifier(thd, &buff, first_table->table_name,
                          first_table->table_name_length);
        buff.append(" AS ", 4);
        buff.append(first_table->source.str, first_table->source.length);

        Query_log_event qinfo(thd, buff.ptr(), buff.length(), 0, FALSE);
4549 4550
        mysql_bin_log.write(&qinfo);
      }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4551 4552 4553 4554
      break;
    }
  case SQLCOM_DROP_VIEW:
    {
4555 4556 4557
      if (check_table_access(thd, DROP_ACL, all_tables, 0) ||
          end_active_trans(thd))
        goto error;
4558 4559 4560
      if (!(res= mysql_drop_view(thd, first_table, thd->lex->drop_mode)) &&
          mysql_bin_log.is_open())
      {
4561
        thd->clear_error();
4562 4563 4564
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
        mysql_bin_log.write(&qinfo);
      }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4565 4566
      break;
    }
4567 4568
  case SQLCOM_CREATE_TRIGGER:
  {
4569 4570 4571
    if (end_active_trans(thd))
      goto error;

4572 4573 4574
    res= mysql_create_or_drop_trigger(thd, all_tables, 1);

    /* We don't care about trigger body after this point */
4575 4576 4577 4578 4579 4580
    delete lex->sphead;
    lex->sphead= 0;
    break;
  }
  case SQLCOM_DROP_TRIGGER:
  {
4581 4582 4583
    if (end_active_trans(thd))
      goto error;

4584 4585 4586
    res= mysql_create_or_drop_trigger(thd, all_tables, 0);
    break;
  }
4587
  case SQLCOM_XA_START:
4588 4589
    if (thd->transaction.xid_state.xa_state == XA_IDLE &&
        thd->lex->xa_opt == XA_RESUME)
4590
    {
4591
      if (! thd->transaction.xid_state.xid.eq(thd->lex->xid))
4592 4593 4594 4595
      {
        my_error(ER_XAER_NOTA, MYF(0));
        break;
      }
4596
      thd->transaction.xid_state.xa_state=XA_ACTIVE;
4597 4598 4599
      send_ok(thd);
      break;
    }
serg@serg.mylan's avatar
serg@serg.mylan committed
4600
    if (thd->lex->xa_opt != XA_NONE)
4601 4602 4603 4604
    { // JOIN is not supported yet. TODO
      my_error(ER_XAER_INVAL, MYF(0));
      break;
    }
4605
    if (thd->transaction.xid_state.xa_state != XA_NOTR)
4606
    {
4607
      my_error(ER_XAER_RMFAIL, MYF(0),
4608
               xa_state_names[thd->transaction.xid_state.xa_state]);
4609 4610 4611 4612 4613 4614 4615
      break;
    }
    if (thd->active_transaction() || thd->locked_tables)
    {
      my_error(ER_XAER_OUTSIDE, MYF(0));
      break;
    }
4616 4617 4618 4619 4620 4621 4622 4623 4624
    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);
4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 4635 4636
    thd->options= ((thd->options & (ulong) ~(OPTION_STATUS_NO_TRANS_UPDATE)) |
                   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;
    }
4637
    if (thd->transaction.xid_state.xa_state != XA_ACTIVE)
4638
    {
4639
      my_error(ER_XAER_RMFAIL, MYF(0),
4640
               xa_state_names[thd->transaction.xid_state.xa_state]);
4641 4642
      break;
    }
4643
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4644 4645 4646 4647
    {
      my_error(ER_XAER_NOTA, MYF(0));
      break;
    }
4648
    thd->transaction.xid_state.xa_state=XA_IDLE;
4649 4650 4651
    send_ok(thd);
    break;
  case SQLCOM_XA_PREPARE:
4652
    if (thd->transaction.xid_state.xa_state != XA_IDLE)
4653
    {
4654
      my_error(ER_XAER_RMFAIL, MYF(0),
4655
               xa_state_names[thd->transaction.xid_state.xa_state]);
4656 4657
      break;
    }
4658
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4659 4660 4661 4662 4663 4664 4665
    {
      my_error(ER_XAER_NOTA, MYF(0));
      break;
    }
    if (ha_prepare(thd))
    {
      my_error(ER_XA_RBROLLBACK, MYF(0));
4666 4667
      xid_cache_delete(&thd->transaction.xid_state);
      thd->transaction.xid_state.xa_state=XA_NOTR;
4668 4669
      break;
    }
4670
    thd->transaction.xid_state.xa_state=XA_PREPARED;
4671 4672 4673
    send_ok(thd);
    break;
  case SQLCOM_XA_COMMIT:
4674
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4675
    {
4676 4677
      XID_STATE *xs=xid_cache_search(thd->lex->xid);
      if (!xs || xs->in_thd)
4678
        my_error(ER_XAER_NOTA, MYF(0));
serg@serg.mylan's avatar
serg@serg.mylan committed
4679
      else
4680 4681 4682
      {
        ha_commit_or_rollback_by_xid(thd->lex->xid, 1);
        xid_cache_delete(xs);
serg@serg.mylan's avatar
serg@serg.mylan committed
4683
        send_ok(thd);
4684
      }
4685 4686
      break;
    }
4687
    if (thd->transaction.xid_state.xa_state == XA_IDLE &&
monty@mysql.com's avatar
monty@mysql.com committed
4688
        thd->lex->xa_opt == XA_ONE_PHASE)
4689
    {
4690 4691 4692
      int r;
      if ((r= ha_commit(thd)))
        my_error(r == 1 ? ER_XA_RBROLLBACK : ER_XAER_RMERR, MYF(0));
4693 4694 4695
      else
        send_ok(thd);
    }
4696
    else if (thd->transaction.xid_state.xa_state == XA_PREPARED &&
monty@mysql.com's avatar
monty@mysql.com committed
4697
             thd->lex->xa_opt == XA_NONE)
4698
    {
4699 4700 4701
      if (wait_if_global_read_lock(thd, 0, 0))
      {
        ha_rollback(thd);
4702
        my_error(ER_XAER_RMERR, MYF(0));
4703
      }
4704
      else
4705 4706 4707 4708 4709 4710 4711
      {
        if (ha_commit_one_phase(thd, 1))
          my_error(ER_XAER_RMERR, MYF(0));
        else
          send_ok(thd);
        start_waiting_global_read_lock(thd);
      }
4712 4713 4714
    }
    else
    {
4715
      my_error(ER_XAER_RMFAIL, MYF(0),
4716
               xa_state_names[thd->transaction.xid_state.xa_state]);
4717 4718 4719 4720
      break;
    }
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
4721 4722
    xid_cache_delete(&thd->transaction.xid_state);
    thd->transaction.xid_state.xa_state=XA_NOTR;
4723 4724
    break;
  case SQLCOM_XA_ROLLBACK:
4725
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4726
    {
4727 4728
      XID_STATE *xs=xid_cache_search(thd->lex->xid);
      if (!xs || xs->in_thd)
4729
        my_error(ER_XAER_NOTA, MYF(0));
serg@serg.mylan's avatar
serg@serg.mylan committed
4730
      else
4731 4732 4733
      {
        ha_commit_or_rollback_by_xid(thd->lex->xid, 0);
        xid_cache_delete(xs);
serg@serg.mylan's avatar
serg@serg.mylan committed
4734
        send_ok(thd);
4735
      }
4736 4737
      break;
    }
4738 4739
    if (thd->transaction.xid_state.xa_state != XA_IDLE &&
        thd->transaction.xid_state.xa_state != XA_PREPARED)
4740
    {
4741
      my_error(ER_XAER_RMFAIL, MYF(0),
4742
               xa_state_names[thd->transaction.xid_state.xa_state]);
4743 4744 4745 4746 4747 4748 4749 4750
      break;
    }
    if (ha_rollback(thd))
      my_error(ER_XAER_RMERR, MYF(0));
    else
      send_ok(thd);
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
4751 4752
    xid_cache_delete(&thd->transaction.xid_state);
    thd->transaction.xid_state.xa_state=XA_NOTR;
4753 4754
    break;
  case SQLCOM_XA_RECOVER:
4755
    res= mysql_xa_recover(thd);
4756 4757 4758
    break;
  default:
    DBUG_ASSERT(0);                             /* Impossible */
4759
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4760 4761
    break;
  }
monty@mysql.com's avatar
monty@mysql.com committed
4762
  thd->proc_info="query end";
4763
  /* Two binlog-related cleanups: */
4764 4765 4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 4776

  /*
    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);

4777

4778 4779 4780 4781 4782
  /*
    The return value for ROW_COUNT() is "implementation dependent" if
    the statement is not DELETE, INSERT or UPDATE (or a CALL executing
    such a statement), but -1 is what JDBC and ODBC wants.
   */
4783
  if (lex->sql_command != SQLCOM_CALL && uc_update_queries[lex->sql_command]<2)
4784
    thd->row_count_func= -1;
4785
  goto cleanup;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4786 4787

error:
4788
  res= 1;
4789

4790 4791
cleanup:
  DBUG_RETURN(res || thd->net.report_error);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4792 4793 4794
}


bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4795 4796
/*
  Check grants for commands which work only with one table and all other
4797
  tables belonging to subselects or implicitly opened tables.
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4798

4799
  SYNOPSIS
monty@mysql.com's avatar
monty@mysql.com committed
4800 4801
    check_one_table_access()
    thd			Thread handler
4802
    privilege		requested privilege
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4803
    all_tables		global table list of query
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4804 4805 4806

  RETURN
    0 - OK
monty@mysql.com's avatar
monty@mysql.com committed
4807
    1 - access denied, error is sent to client
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4808 4809
*/

4810
bool check_one_table_access(THD *thd, ulong privilege, TABLE_LIST *all_tables)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4811
{
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4812
  if (check_access(thd, privilege, all_tables->db,
4813 4814
		   &all_tables->grant.privilege, 0, 0,
                   test(all_tables->schema_table)))
monty@mysql.com's avatar
monty@mysql.com committed
4815
    return 1;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4816

4817
  /* Show only 1 table for check_grant */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4818
  if (grant_option && check_grant(thd, privilege, all_tables, 0, 1, 0))
monty@mysql.com's avatar
monty@mysql.com committed
4819
    return 1;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4820

4821
  /* Check rights on tables of subselects and implictly opened tables */
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4822
  TABLE_LIST *subselects_tables;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4823
  if ((subselects_tables= all_tables->next_global))
monty@mysql.com's avatar
monty@mysql.com committed
4824
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4825
    if ((check_table_access(thd, SELECT_ACL, subselects_tables, 0)))
monty@mysql.com's avatar
monty@mysql.com committed
4826 4827 4828
      return 1;
  }
  return 0;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4829 4830 4831
}


bk@work.mysql.com's avatar
bk@work.mysql.com committed
4832
/****************************************************************************
4833
  Get the user (global) and database privileges for all used tables
4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845 4846

  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
4847 4848
                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
4849 4850 4851
****************************************************************************/

bool
4852
check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
4853
	     bool dont_check_global_grants, bool no_errors, bool schema_db)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4854
{
4855
  Security_context *sctx= thd->security_ctx;
4856 4857
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  ulong db_access;
4858
  bool  db_is_pattern= test(want_access & GRANT_ACL);
4859 4860
#endif
  ulong dummy;
4861 4862
  DBUG_ENTER("check_access");
  DBUG_PRINT("enter",("db: %s  want_access: %lu  master_access: %lu",
4863
                      db ? db : "", want_access, sctx->master_access));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4864 4865 4866 4867 4868
  if (save_priv)
    *save_priv=0;
  else
    save_priv= &dummy;

4869
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
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bk@work.mysql.com committed
4870
  {
4871
    DBUG_PRINT("error",("No database"));
4872
    if (!no_errors)
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bell@sanja.is.com.ua committed
4873 4874
      my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR),
                 MYF(0));                       /* purecov: tested */
4875
    DBUG_RETURN(TRUE);				/* purecov: tested */
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4876 4877
  }

4878 4879 4880 4881 4882
  if (schema_db)
  {
    if (want_access & ~(SELECT_ACL | EXTRA_ACL))
    {
      if (!no_errors)
4883 4884
      {
        const char *db_name= db ? db : thd->db;
4885
        my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
4886 4887
                 sctx->priv_user, sctx->priv_host, db_name);
      }
4888 4889 4890 4891 4892 4893 4894 4895 4896
      DBUG_RETURN(TRUE);
    }
    else
    {
      *save_priv= SELECT_ACL;
      DBUG_RETURN(FALSE);
    }
  }

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4897 4898 4899
#ifdef NO_EMBEDDED_ACCESS_CHECKS
  DBUG_RETURN(0);
#else
4900
  if ((sctx->master_access & want_access) == want_access)
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4901
  {
4902 4903 4904 4905 4906
    /*
      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
    */
4907 4908
    db_access= sctx->db_access;
    if (!(sctx->master_access & SELECT_ACL) &&
4909
	(db && (!thd->db || db_is_pattern || strcmp(db,thd->db))))
4910 4911 4912
      db_access=acl_get(sctx->host, sctx->ip, sctx->priv_user, db,
                        db_is_pattern);
    *save_priv=sctx->master_access | db_access;
4913
    DBUG_RETURN(FALSE);
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bk@work.mysql.com committed
4914
  }
4915
  if (((want_access & ~sctx->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
4916
      ! db && dont_check_global_grants)
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bk@work.mysql.com committed
4917
  {						// We can never grant this
4918
    DBUG_PRINT("error",("No possible access"));
4919
    if (!no_errors)
4920
      my_error(ER_ACCESS_DENIED_ERROR, MYF(0),
4921 4922
               sctx->priv_user,
               sctx->priv_host,
4923 4924 4925
               (thd->password ?
                ER(ER_YES) :
                ER(ER_NO)));                    /* purecov: tested */
4926
    DBUG_RETURN(TRUE);				/* purecov: tested */
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4927 4928 4929
  }

  if (db == any_db)
4930
    DBUG_RETURN(FALSE);				// Allow select on anything
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monty@hundin.mysql.fi committed
4931

4932
  if (db && (!thd->db || db_is_pattern || strcmp(db,thd->db)))
4933 4934
    db_access= acl_get(sctx->host, sctx->ip, sctx->priv_user, db,
                       db_is_pattern);
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4935
  else
4936
    db_access= sctx->db_access;
4937
  DBUG_PRINT("info",("db_access: %lu", db_access));
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4938
  /* Remove SHOW attribute and access rights we already have */
4939
  want_access &= ~(sctx->master_access | EXTRA_ACL);
4940 4941
  DBUG_PRINT("info",("db_access: %lu  want_access: %lu",
                     db_access, want_access));
4942
  db_access= ((*save_priv=(db_access | sctx->master_access)) & want_access);
4943 4944

  /* grant_option is set if there exists a single table or column grant */
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4945
  if (db_access == want_access ||
4946
      (grant_option && !dont_check_global_grants &&
4947
       !(want_access & ~(db_access | TABLE_ACLS | PROC_ACLS))))
4948
    DBUG_RETURN(FALSE);				/* Ok */
4949 4950

  DBUG_PRINT("error",("Access denied"));
4951
  if (!no_errors)
4952
    my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
4953
             sctx->priv_user, sctx->priv_host,
4954 4955 4956
             (db ? db : (thd->db ?
                         thd->db :
                         "unknown")));          /* purecov: tested */
4957
  DBUG_RETURN(TRUE);				/* purecov: tested */
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4958
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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4959 4960 4961
}


4962 4963 4964 4965 4966 4967 4968 4969 4970
/*
  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
4971
    One gets access right if one has ANY of the rights in want_access
4972 4973 4974 4975 4976 4977 4978 4979
    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
*/
4980 4981

bool check_global_access(THD *thd, ulong want_access)
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4982
{
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4983 4984 4985
#ifdef NO_EMBEDDED_ACCESS_CHECKS
  return 0;
#else
4986
  char command[128];
4987
  if ((thd->security_ctx->master_access & want_access))
4988 4989
    return 0;
  get_privilege_desc(command, sizeof(command), want_access);
4990
  my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), command);
4991
  return 1;
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4992
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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4993 4994 4995
}


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4996
/*
4997 4998
  Check the privilege for all used tables.  Table privileges are cached
  in the table list for GRANT checking
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4999 5000
*/

5001
bool
5002
check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
5003
		   bool no_errors)
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5004
{
5005 5006
  uint found=0;
  ulong found_access=0;
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5007
  TABLE_LIST *org_tables=tables;
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VIEW  
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5008
  for (; tables; tables= tables->next_global)
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bk@work.mysql.com committed
5009
  {
5010
    if (tables->schema_table && 
5011
        (want_access & ~(SELECT_ACL | EXTRA_ACL | FILE_ACL)))
5012 5013 5014
    {
      if (!no_errors)
        my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
5015
                 thd->security_ctx->priv_user, thd->security_ctx->priv_host,
5016 5017 5018
                 information_schema_name.str);
      return TRUE;
    }
5019
    if (tables->derived || tables->schema_table || tables->belong_to_view ||
5020
        (tables->table && (int)tables->table->s->tmp_table) ||
5021 5022
        my_tz_check_n_skip_implicit_tables(&tables,
                                           thd->lex->time_zone_tables_used))
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Sinisa@sinisa.nasamreza.org committed
5023
      continue;
5024 5025
    if ((thd->security_ctx->master_access & want_access) ==
        (want_access & ~EXTRA_ACL) &&
5026
	thd->db)
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bk@work.mysql.com committed
5027
      tables->grant.privilege= want_access;
5028
    else if (tables->db && tables->db == thd->db)
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5029 5030 5031 5032 5033
    {
      if (found && !grant_option)		// db already checked
	tables->grant.privilege=found_access;
      else
      {
5034
	if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
5035
			 0, no_errors, test(tables->schema_table)))
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5036 5037
	  return TRUE;				// Access denied
	found_access=tables->grant.privilege;
5038
	found=1;
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5039 5040
      }
    }
5041
    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
5042
			  0, no_errors, test(tables->schema_table)))
5043
      return TRUE;
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5044 5045
  }
  if (grant_option)
5046
    return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
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5047
		       test(want_access & EXTRA_ACL), UINT_MAX, no_errors);
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5048 5049 5050
  return FALSE;
}

5051

5052
bool
5053 5054
check_routine_access(THD *thd, ulong want_access,char *db, char *name,
		     bool is_proc, bool no_errors)
5055 5056 5057 5058 5059
{
  TABLE_LIST tables[1];
  
  bzero((char *)tables, sizeof(TABLE_LIST));
  tables->db= db;
5060
  tables->table_name= tables->alias= name;
5061
  
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5062 5063 5064 5065 5066 5067 5068
  /*
    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)
5069 5070
    tables->grant.privilege= want_access;
  else if (check_access(thd,want_access,db,&tables->grant.privilege,
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5071
			0, no_errors, 0))
5072 5073
    return TRUE;
  
5074
#ifndef NO_EMBEDDED_ACCESS_CHECKS
5075
  if (grant_option)
5076
    return check_grant_routine(thd, want_access, tables, is_proc, no_errors);
5077
#endif
5078 5079 5080 5081

  return FALSE;
}

5082 5083 5084 5085 5086 5087 5088 5089 5090 5091 5092 5093 5094 5095 5096

/*
  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
*/

5097 5098
bool check_some_routine_access(THD *thd, const char *db, const char *name,
                               bool is_proc)
5099 5100
{
  ulong save_priv;
5101
  if (thd->security_ctx->master_access & SHOW_PROC_ACLS)
5102
    return FALSE;
5103 5104 5105 5106 5107
  /*
    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) ||
5108 5109
      (save_priv & SHOW_PROC_ACLS))
    return FALSE;
5110
  return check_routine_level_acl(thd, db, name, is_proc);
5111 5112 5113
}


5114 5115 5116 5117 5118 5119 5120 5121 5122 5123 5124 5125 5126 5127 5128 5129 5130 5131 5132 5133 5134 5135 5136 5137 5138
/*
  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,
5139 5140
                        &table->grant.privilege, 0, 1,
                        test(table->schema_table)) &&
5141 5142 5143 5144 5145 5146 5147 5148 5149
          !grant_option || !check_grant(thd, access, table, 0, 1, 1))
        DBUG_RETURN(0);
    }
  }
  DBUG_PRINT("exit",("no matching access rights"));
  DBUG_RETURN(1);
}


5150 5151
bool check_merge_table_access(THD *thd, char *db,
			      TABLE_LIST *table_list)
5152 5153 5154 5155
{
  int error=0;
  if (table_list)
  {
5156
    /* Check that all tables use the current database */
5157
    TABLE_LIST *tmp;
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5158
    for (tmp= table_list; tmp; tmp= tmp->next_local)
5159 5160 5161 5162
    {
      if (!tmp->db || !tmp->db[0])
	tmp->db=db;
    }
5163
    error=check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
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5164
			     table_list,0);
5165 5166 5167 5168
  }
  return error;
}

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5169 5170 5171

static bool check_db_used(THD *thd,TABLE_LIST *tables)
{
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VIEW  
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5172
  for (; tables; tables= tables->next_global)
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5173 5174 5175 5176 5177
  {
    if (!tables->db)
    {
      if (!(tables->db=thd->db))
      {
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5178 5179
	my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR),
                   MYF(0));                     /* purecov: tested */
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5180 5181 5182 5183 5184 5185
	return TRUE;				/* purecov: tested */
      }
    }
  }
  return FALSE;
}
5186

5187

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5188 5189 5190 5191 5192 5193 5194 5195 5196 5197
/****************************************************************************
	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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5198 5199 5200 5201
#ifndef DBUG_OFF
long max_stack_used;
#endif

5202
#ifndef EMBEDDED_LIBRARY
5203 5204 5205 5206 5207 5208 5209 5210
/*
  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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5211 5212 5213
{
  long stack_used;
  if ((stack_used=used_stack(thd->thread_stack,(char*) &stack_used)) >=
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5214
      (long) (thread_stack - margin))
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5215
  {
5216 5217 5218
    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));
5219
    thd->fatal_error();
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5220 5221
    return 1;
  }
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5222 5223 5224
#ifndef DBUG_OFF
  max_stack_used= max(max_stack_used, stack_used);
#endif
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5225 5226
  return 0;
}
5227
#endif /* EMBEDDED_LIBRARY */
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5228 5229 5230 5231

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

5232
bool my_yyoverflow(short **yyss, YYSTYPE **yyvs, ulong *yystacksize)
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5233 5234
{
  LEX	*lex=current_lex;
5235
  ulong old_info=0;
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  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;
}


/****************************************************************************
5262
  Initialize global thd variables needed for query
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5263 5264
****************************************************************************/

5265
void
5266
mysql_init_query(THD *thd, uchar *buf, uint length)
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5267 5268
{
  DBUG_ENTER("mysql_init_query");
5269
  lex_start(thd, buf, length);
5270 5271 5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282 5283 5284 5285 5286 5287 5288 5289 5290
  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).

 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");
5291
  thd->free_list= 0;
5292
  thd->select_number= 1;
5293
  thd->last_insert_id_used= thd->query_start_used= thd->insert_id_used=0;
5294
  thd->is_fatal_error= thd->time_zone_used= 0;
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5295
  thd->server_status&= ~ (SERVER_MORE_RESULTS_EXISTS | 
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5296 5297
                          SERVER_QUERY_NO_INDEX_USED |
                          SERVER_QUERY_NO_GOOD_INDEX_USED);
5298
  DBUG_ASSERT(thd->security_ctx== &thd->main_security_ctx);
5299
  thd->tmp_table_used= 0;
5300 5301
  if (!thd->in_sub_stmt)
  {
5302
    if (opt_bin_log)
5303
    {
5304
      reset_dynamic(&thd->user_var_events);
5305 5306
      thd->user_var_events_alloc= thd->mem_root;
    }
5307
    thd->clear_error();
5308 5309 5310 5311
    thd->total_warn_count=0;			// Warnings for this query
    thd->rand_used= 0;
    thd->sent_row_count= thd->examined_row_count= 0;
  }
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5312 5313 5314
  DBUG_VOID_RETURN;
}

5315

5316 5317 5318
void
mysql_init_select(LEX *lex)
{
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5319
  SELECT_LEX *select_lex= lex->current_select;
5320
  select_lex->init_select();
5321
  lex->wild= 0;
5322 5323
  if (select_lex == &lex->select_lex)
  {
5324
    DBUG_ASSERT(lex->result == 0);
5325 5326
    lex->exchange= 0;
  }
5327 5328
}

5329

5330
bool
5331
mysql_new_select(LEX *lex, bool move_down)
5332
{
5333
  SELECT_LEX *select_lex;
5334
  THD *thd= lex->thd;
5335 5336
  DBUG_ENTER("mysql_new_select");

5337
  if (!(select_lex= new (thd->mem_root) SELECT_LEX()))
5338
    DBUG_RETURN(1);
5339
  select_lex->select_number= ++thd->select_number;
5340
  select_lex->parent_lex= lex; /* Used in init_query. */
5341 5342
  select_lex->init_query();
  select_lex->init_select();
5343 5344 5345 5346 5347
  /*
    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.
  */
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5348
  if (thd->stmt_arena->is_stmt_prepare())
5349
    select_lex->uncacheable|= UNCACHEABLE_PREPARE;
5350 5351
  if (move_down)
  {
5352
    SELECT_LEX_UNIT *unit;
5353
    lex->subqueries= TRUE;
5354
    /* first select_lex of subselect or derived table */
5355
    if (!(unit= new (thd->mem_root) SELECT_LEX_UNIT()))
5356
      DBUG_RETURN(1);
5357

5358 5359
    unit->init_query();
    unit->init_select();
5360
    unit->thd= thd;
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5361
    unit->include_down(lex->current_select);
5362 5363
    unit->link_next= 0;
    unit->link_prev= 0;
5364
    unit->return_to= lex->current_select;
5365
    select_lex->include_down(unit);
5366 5367 5368 5369 5370
    /*
      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;
5371 5372
  }
  else
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5373
  {
5374
    Name_resolution_context *outer_context;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
5375 5376
    if (lex->current_select->order_list.first && !lex->current_select->braces)
    {
5377
      my_error(ER_WRONG_USAGE, MYF(0), "UNION", "ORDER BY");
5378
      DBUG_RETURN(1);
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
5379
    }
5380
    select_lex->include_neighbour(lex->current_select);
5381 5382 5383 5384 5385 5386
    /*
      we are not sure that we have one level of SELECTs above, so we take
      outer_context address from first select of unit
    */
    outer_context=
      select_lex->master_unit()->first_select()->context.outer_context;
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5387 5388 5389 5390 5391 5392 5393 5394
    SELECT_LEX_UNIT *unit= select_lex->master_unit();
    SELECT_LEX *fake= unit->fake_select_lex;
    if (!fake)
    {
      /*
	as far as we included SELECT_LEX for UNION unit should have
	fake SELECT_LEX for UNION processing
      */
5395
      if (!(fake= unit->fake_select_lex= new (thd->mem_root) SELECT_LEX()))
5396
        DBUG_RETURN(1);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5397 5398 5399
      fake->include_standalone(unit,
			       (SELECT_LEX_NODE**)&unit->fake_select_lex);
      fake->select_number= INT_MAX;
5400
      fake->parent_lex= lex; /* Used in init_query. */
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bell@sanja.is.com.ua committed
5401 5402
      fake->make_empty_select();
      fake->linkage= GLOBAL_OPTIONS_TYPE;
5403
      fake->select_limit= 0;
5404 5405 5406 5407 5408

      fake->context.outer_context= outer_context;
      /* allow item list resolving in fake select for ORDER BY */
      fake->context.resolve_in_select_list= TRUE;
      fake->context.select_lex= fake;
5409 5410 5411 5412 5413
      /*
        Remove the name resolution context of the fake select from the
        context stack.
       */
      lex->pop_context();
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5414
    }
5415
    select_lex->context.outer_context= outer_context;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5416
  }
peter@mysql.com's avatar
peter@mysql.com committed
5417

5418
  select_lex->master_unit()->global_parameters= select_lex;
5419
  select_lex->include_global((st_select_lex_node**)&lex->all_selects_list);
5420
  lex->current_select= select_lex;
5421 5422 5423 5424 5425
  /*
    in subquery is SELECT query and we allow resolution of names in SELECT
    list
  */
  select_lex->context.resolve_in_select_list= TRUE;
5426
  DBUG_RETURN(0);
5427
}
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5428

5429 5430 5431 5432 5433 5434 5435 5436 5437 5438 5439 5440 5441 5442 5443
/*
  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)
{
5444
  THD *thd;
5445
  LEX *lex;
5446
  LEX_STRING tmp, null_lex_string;
5447 5448
  Item *var;
  char buff[MAX_SYS_VAR_LENGTH*2+4+8], *end;
5449
  DBUG_ENTER("create_select_for_variable");
5450 5451

  thd= current_thd;
pem@mysql.telia.com's avatar
pem@mysql.telia.com committed
5452
  lex= thd->lex;
5453 5454 5455 5456
  mysql_init_select(lex);
  lex->sql_command= SQLCOM_SELECT;
  tmp.str= (char*) var_name;
  tmp.length=strlen(var_name);
5457
  bzero((char*) &null_lex_string.str, sizeof(null_lex_string));
5458 5459 5460 5461
  /*
    We set the name of Item to @@session.var_name because that then is used
    as the column name in the output.
  */
monty@mysql.com's avatar
monty@mysql.com committed
5462 5463 5464 5465 5466 5467
  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);
  }
5468 5469 5470
  DBUG_VOID_RETURN;
}

5471

monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5472 5473
void mysql_init_multi_delete(LEX *lex)
{
5474
  lex->sql_command=  SQLCOM_DELETE_MULTI;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5475
  mysql_init_select(lex);
5476 5477
  lex->select_lex.select_limit= 0;
  lex->unit.select_limit_cnt= HA_POS_ERROR;
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monty@mashka.mysql.fi committed
5478
  lex->select_lex.table_list.save_and_clear(&lex->auxilliary_table_list);
5479
  lex->lock_option= using_update_log ? TL_READ_NO_INSERT : TL_READ;
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VIEW  
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5480 5481
  lex->query_tables= 0;
  lex->query_tables_last= &lex->query_tables;
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monty@hundin.mysql.fi committed
5482
}
5483

5484

5485 5486 5487 5488
/*
  When you modify mysql_parse(), you may need to mofify
  mysql_test_parse_for_slave() in this same file.
*/
5489

5490
void mysql_parse(THD *thd, char *inBuf, uint length)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5491 5492
{
  DBUG_ENTER("mysql_parse");
5493
  mysql_init_query(thd, (uchar*) inBuf, length);
5494
  if (query_cache_send_result_to_client(thd, inBuf, length) <= 0)
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5495
  {
5496
    LEX *lex= thd->lex;
5497
    
5498 5499
    sp_cache_flush_obsolete(&thd->sp_proc_cache);
    sp_cache_flush_obsolete(&thd->sp_func_cache);
5500
    
5501
    if (!yyparse((void *)thd) && ! thd->is_fatal_error)
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5502
    {
hf@deer.(none)'s avatar
hf@deer.(none) committed
5503
#ifndef NO_EMBEDDED_ACCESS_CHECKS
5504
      if (mqh_used && thd->user_connect &&
5505
	  check_mqh(thd, lex->sql_command))
5506 5507 5508 5509
      {
	thd->net.error = 0;
      }
      else
hf@deer.(none)'s avatar
hf@deer.(none) committed
5510
#endif
5511
      {
5512
	if (thd->net.report_error)
5513 5514
	{
	  if (thd->lex->sphead)
5515 5516 5517 5518
	  {
	    delete thd->lex->sphead;
	    thd->lex->sphead= NULL;
	  }
5519
	}
5520 5521
	else
	{
5522 5523 5524 5525 5526 5527 5528 5529 5530 5531
          /*
            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
5532 5533
          if (lex->found_semicolon &&
              (thd->query_length= (ulong)(lex->found_semicolon - thd->query)))
5534 5535
            thd->query_length--;
          /* Actually execute the query */
5536
	  mysql_execute_command(thd);
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
5537
	  query_cache_end_of_result(thd);
5538
	}
5539
      }
5540
      lex->unit.cleanup();
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5541 5542
    }
    else
5543 5544
    {
      DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
5545
			 thd->is_fatal_error));
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5546
      query_cache_abort(&thd->net);
5547
      lex->unit.cleanup();
5548
      if (thd->lex->sphead)
5549
      {
monty@mysql.com's avatar
monty@mysql.com committed
5550
	/* Clean up after failed stored procedure/function */
5551 5552 5553
	delete thd->lex->sphead;
	thd->lex->sphead= NULL;
      }
5554
    }
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5555
    thd->proc_info="freeing items";
5556
    thd->end_statement();
5557
    thd->cleanup_after_query();
5558
    DBUG_ASSERT(thd->change_list.is_empty());
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monty@hundin.mysql.fi committed
5559
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5560 5561 5562 5563
  DBUG_VOID_RETURN;
}


monty@mysql.com's avatar
monty@mysql.com committed
5564
#ifdef HAVE_REPLICATION
5565 5566 5567 5568 5569 5570 5571 5572 5573 5574 5575
/*
  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)
{
5576
  LEX *lex= thd->lex;
5577
  bool error= 0;
monty@mysql.com's avatar
monty@mysql.com committed
5578
  DBUG_ENTER("mysql_test_parse_for_slave");
5579

5580
  mysql_init_query(thd, (uchar*) inBuf, length);
monty@mysql.com's avatar
monty@mysql.com committed
5581
  if (!yyparse((void*) thd) && ! thd->is_fatal_error &&
5582
      all_tables_not_ok(thd,(TABLE_LIST*) lex->select_lex.table_list.first))
monty@mysql.com's avatar
monty@mysql.com committed
5583
    error= 1;                  /* Ignore question */
5584
  thd->end_statement();
5585
  thd->cleanup_after_query();
monty@mysql.com's avatar
monty@mysql.com committed
5586
  DBUG_RETURN(error);
5587
}
monty@mysql.com's avatar
monty@mysql.com committed
5588
#endif
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bk@work.mysql.com committed
5589

5590

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monty@mysql.com committed
5591

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bk@work.mysql.com committed
5592 5593 5594 5595 5596
/*****************************************************************************
** Store field definition for create
** Return 0 if ok
******************************************************************************/

monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
5597
bool add_field_to_list(THD *thd, char *field_name, enum_field_types type,
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5598
		       char *length, char *decimals,
5599
		       uint type_modifier,
5600 5601
		       Item *default_value, Item *on_update_value,
                       LEX_STRING *comment,
5602 5603
		       char *change,
                       List<String> *interval_list, CHARSET_INFO *cs,
5604
		       uint uint_geom_type)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5605 5606
{
  register create_field *new_field;
5607
  LEX  *lex= thd->lex;
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bk@work.mysql.com committed
5608 5609 5610 5611
  DBUG_ENTER("add_field_to_list");

  if (strlen(field_name) > NAME_LEN)
  {
5612
    my_error(ER_TOO_LONG_IDENT, MYF(0), field_name); /* purecov: inspected */
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bk@work.mysql.com committed
5613 5614 5615 5616 5617
    DBUG_RETURN(1);				/* purecov: inspected */
  }
  if (type_modifier & PRI_KEY_FLAG)
  {
    lex->col_list.push_back(new key_part_spec(field_name,0));
5618
    lex->key_list.push_back(new Key(Key::PRIMARY, NullS, HA_KEY_ALG_UNDEF,
5619
				    0, lex->col_list));
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5620 5621 5622 5623 5624
    lex->col_list.empty();
  }
  if (type_modifier & (UNIQUE_FLAG | UNIQUE_KEY_FLAG))
  {
    lex->col_list.push_back(new key_part_spec(field_name,0));
5625
    lex->key_list.push_back(new Key(Key::UNIQUE, NullS, HA_KEY_ALG_UNDEF, 0,
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bk@work.mysql.com committed
5626 5627 5628 5629
				    lex->col_list));
    lex->col_list.empty();
  }

5630
  if (default_value)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5631
  {
5632
    /* 
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5633 5634
      Default value should be literal => basic constants =>
      no need fix_fields()
5635 5636 5637
      
      We allow only one function as part of default value - 
      NOW() as default for TIMESTAMP type.
5638
    */
5639 5640 5641
    if (default_value->type() == Item::FUNC_ITEM && 
        !(((Item_func*)default_value)->functype() == Item_func::NOW_FUNC &&
         type == FIELD_TYPE_TIMESTAMP))
5642
    {
5643
      my_error(ER_INVALID_DEFAULT, MYF(0), field_name);
5644 5645 5646
      DBUG_RETURN(1);
    }
    else if (default_value->type() == Item::NULL_ITEM)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5647
    {
5648
      default_value= 0;
5649 5650 5651
      if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) ==
	  NOT_NULL_FLAG)
      {
5652
	my_error(ER_INVALID_DEFAULT, MYF(0), field_name);
5653 5654 5655 5656 5657
	DBUG_RETURN(1);
      }
    }
    else if (type_modifier & AUTO_INCREMENT_FLAG)
    {
5658
      my_error(ER_INVALID_DEFAULT, MYF(0), field_name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5659 5660 5661
      DBUG_RETURN(1);
    }
  }
5662 5663 5664

  if (on_update_value && type != FIELD_TYPE_TIMESTAMP)
  {
5665
    my_error(ER_INVALID_ON_UPDATE, MYF(0), field_name);
5666 5667
    DBUG_RETURN(1);
  }
5668

5669 5670 5671 5672 5673 5674
  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
5675
    char buf[32];
5676
    my_snprintf(buf, sizeof(buf), "TIMESTAMP(%s)", length);
5677 5678 5679
    push_warning_printf(thd,MYSQL_ERROR::WARN_LEVEL_WARN,
                        ER_WARN_DEPRECATED_SYNTAX,
                        ER(ER_WARN_DEPRECATED_SYNTAX),
msvensson@neptunus.(none)'s avatar
msvensson@neptunus.(none) committed
5680
                        buf, "TIMESTAMP");
5681 5682
  }

5683 5684 5685
  if (!(new_field= new_create_field(thd, field_name, type, length, decimals,
		type_modifier, default_value, on_update_value,
		comment, change, interval_list, cs, uint_geom_type)))
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bk@work.mysql.com committed
5686
    DBUG_RETURN(1);
5687 5688 5689 5690 5691 5692 5693 5694 5695 5696 5697 5698 5699 5700 5701 5702 5703 5704 5705 5706 5707 5708 5709 5710 5711 5712 5713

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

/*****************************************************************************
** Create field definition for create
** Return 0 on failure, otherwise return create_field instance
******************************************************************************/
  
create_field *
new_create_field(THD *thd, char *field_name, enum_field_types type,
		 char *length, char *decimals,
		 uint type_modifier, 
		 Item *default_value, Item *on_update_value,
		 LEX_STRING *comment,
		 char *change, List<String> *interval_list, CHARSET_INFO *cs,
		 uint uint_geom_type)
{
  register create_field *new_field;
  uint sign_len, allowed_type_modifier=0;
  ulong max_field_charlength= MAX_FIELD_CHARLENGTH;
  DBUG_ENTER("new_create_field");
  
  if (!(new_field=new create_field()))
    DBUG_RETURN(NULL);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5714 5715
  new_field->field=0;
  new_field->field_name=field_name;
5716
  new_field->def= default_value;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5717 5718 5719
  new_field->flags= type_modifier;
  new_field->unireg_check= (type_modifier & AUTO_INCREMENT_FLAG ?
			    Field::NEXT_NUMBER : Field::NONE);
5720 5721 5722 5723 5724 5725 5726 5727
  new_field->decimals= decimals ? (uint)atoi(decimals) : 0;
  if (new_field->decimals >= NOT_FIXED_DEC)
  {
    my_error(ER_TOO_BIG_SCALE, MYF(0), new_field->decimals, field_name,
             NOT_FIXED_DEC-1);
    DBUG_RETURN(NULL);
  }

bk@work.mysql.com's avatar
bk@work.mysql.com committed
5728 5729 5730 5731
  new_field->sql_type=type;
  new_field->length=0;
  new_field->change=change;
  new_field->interval=0;
5732
  new_field->pack_length= new_field->key_length= 0;
5733
  new_field->charset=cs;
5734
  new_field->geom_type= (Field::geometry_type) uint_geom_type;
5735

5736
  new_field->comment=*comment;
5737 5738 5739
  /*
    Set flag if this field doesn't have a default value
  */
5740
  if (!default_value && !(type_modifier & AUTO_INCREMENT_FLAG) &&
5741
      (type_modifier & NOT_NULL_FLAG) && type != FIELD_TYPE_TIMESTAMP)
5742 5743
    new_field->flags|= NO_DEFAULT_VALUE_FLAG;

5744 5745
  if (length && !(new_field->length= (uint) atoi(length)))
    length=0; /* purecov: inspected */
5746
  sign_len=type_modifier & UNSIGNED_FLAG ? 0 : 1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5747 5748 5749

  switch (type) {
  case FIELD_TYPE_TINY:
5750
    if (!length) new_field->length=MAX_TINYINT_WIDTH+sign_len;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5751 5752 5753
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_SHORT:
5754
    if (!length) new_field->length=MAX_SMALLINT_WIDTH+sign_len;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5755 5756 5757
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_INT24:
5758
    if (!length) new_field->length=MAX_MEDIUMINT_WIDTH+sign_len;
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bk@work.mysql.com committed
5759 5760 5761
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_LONG:
5762
    if (!length) new_field->length=MAX_INT_WIDTH+sign_len;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5763 5764 5765
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_LONGLONG:
5766
    if (!length) new_field->length=MAX_BIGINT_WIDTH;
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bk@work.mysql.com committed
5767 5768 5769 5770
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_NULL:
    break;
5771
  case FIELD_TYPE_NEWDECIMAL:
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5772
    if (!length)
5773 5774
      new_field->length= 10;
    if (new_field->length > DECIMAL_MAX_PRECISION)
monty@mysql.com's avatar
monty@mysql.com committed
5775
    {
5776 5777 5778
      my_error(ER_TOO_BIG_PRECISION, MYF(0), new_field->length, field_name,
               DECIMAL_MAX_PRECISION);
      DBUG_RETURN(NULL);
monty@mysql.com's avatar
monty@mysql.com committed
5779
    }
5780
    if (new_field->length < new_field->decimals)
5781
    {
5782
      my_error(ER_M_BIGGER_THAN_D, MYF(0), field_name);
5783
      DBUG_RETURN(NULL);
5784
    }
5785 5786 5787 5788 5789 5790
    new_field->length=
      my_decimal_precision_to_length(new_field->length, new_field->decimals,
                                     type_modifier & UNSIGNED_FLAG);
    new_field->pack_length=
      my_decimal_get_binary_size(new_field->length, new_field->decimals);
    break;
5791 5792 5793 5794 5795 5796 5797 5798 5799
  case MYSQL_TYPE_VARCHAR:
    /*
      Long VARCHAR's are automaticly converted to blobs in mysql_prepare_table
      if they don't have a default value
    */
    max_field_charlength= MAX_FIELD_VARCHARLENGTH;
    break;
  case MYSQL_TYPE_STRING:
    break;
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5800 5801 5802 5803
  case FIELD_TYPE_BLOB:
  case FIELD_TYPE_TINY_BLOB:
  case FIELD_TYPE_LONG_BLOB:
  case FIELD_TYPE_MEDIUM_BLOB:
5804
  case FIELD_TYPE_GEOMETRY:
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5805 5806 5807 5808 5809 5810
    if (default_value)				// Allow empty as default value
    {
      String str,*res;
      res=default_value->val_str(&str);
      if (res->length())
      {
5811 5812
	my_error(ER_BLOB_CANT_HAVE_DEFAULT, MYF(0),
                 field_name); /* purecov: inspected */
5813
	DBUG_RETURN(NULL);
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5814 5815 5816 5817 5818 5819 5820 5821 5822 5823 5824 5825 5826 5827 5828 5829 5830 5831
      }
      new_field->def=0;
    }
    new_field->flags|=BLOB_FLAG;
    break;
  case FIELD_TYPE_YEAR:
    if (!length || new_field->length != 2)
      new_field->length=4;			// Default length
    new_field->flags|= ZEROFILL_FLAG | UNSIGNED_FLAG;
    break;
  case FIELD_TYPE_FLOAT:
    /* change FLOAT(precision) to FLOAT or DOUBLE */
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    if (length && !decimals)
    {
      uint tmp_length=new_field->length;
      if (tmp_length > PRECISION_FOR_DOUBLE)
      {
5832
	my_error(ER_WRONG_FIELD_SPEC, MYF(0), field_name);
5833
	DBUG_RETURN(NULL);
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      }
      else if (tmp_length > PRECISION_FOR_FLOAT)
      {
	new_field->sql_type=FIELD_TYPE_DOUBLE;
	new_field->length=DBL_DIG+7;			// -[digits].E+###
      }
      else
	new_field->length=FLT_DIG+6;			// -[digits].E+##
      new_field->decimals= NOT_FIXED_DEC;
      break;
    }
5845
    if (!length && !decimals)
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    {
      new_field->length =  FLT_DIG+6;
      new_field->decimals= NOT_FIXED_DEC;
    }
5850 5851 5852
    if (new_field->length < new_field->decimals &&
        new_field->decimals != NOT_FIXED_DEC)
    {
5853
      my_error(ER_M_BIGGER_THAN_D, MYF(0), field_name);
5854 5855
      DBUG_RETURN(NULL);
    }
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    break;
  case FIELD_TYPE_DOUBLE:
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
5859
    if (!length && !decimals)
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    {
      new_field->length = DBL_DIG+7;
      new_field->decimals=NOT_FIXED_DEC;
    }
5864 5865 5866
    if (new_field->length < new_field->decimals &&
        new_field->decimals != NOT_FIXED_DEC)
    {
5867
      my_error(ER_M_BIGGER_THAN_D, MYF(0), field_name);
5868 5869
      DBUG_RETURN(NULL);
    }
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    break;
  case FIELD_TYPE_TIMESTAMP:
    if (!length)
      new_field->length= 14;			// Full date YYYYMMDDHHMMSS
5874
    else if (new_field->length != 19)
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    {
5876 5877 5878 5879
      /*
        We support only even TIMESTAMP lengths less or equal than 14
        and 19 as length of 4.1 compatible representation.
      */
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      new_field->length=((new_field->length+1)/2)*2; /* purecov: inspected */
      new_field->length= min(new_field->length,14); /* purecov: inspected */
    }
5883
    new_field->flags|= ZEROFILL_FLAG | UNSIGNED_FLAG;
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    if (default_value)
    {
      /* Grammar allows only NOW() value for ON UPDATE clause */
      if (default_value->type() == Item::FUNC_ITEM && 
          ((Item_func*)default_value)->functype() == Item_func::NOW_FUNC)
      {
        new_field->unireg_check= (on_update_value?Field::TIMESTAMP_DNUN_FIELD:
                                                  Field::TIMESTAMP_DN_FIELD);
        /*
          We don't need default value any longer moreover it is dangerous.
          Everything handled by unireg_check further.
        */
        new_field->def= 0;
      }
      else
        new_field->unireg_check= (on_update_value?Field::TIMESTAMP_UN_FIELD:
                                                  Field::NONE);
    }
    else
    {
5904 5905 5906 5907 5908 5909 5910 5911
      /*
        If we have default TIMESTAMP NOT NULL column without explicit DEFAULT
        or ON UPDATE values then for the sake of compatiblity we should treat
        this column as having DEFAULT NOW() ON UPDATE NOW() (when we don't
        have another TIMESTAMP column with auto-set option before this one)
        or DEFAULT 0 (in other cases).
        So here we are setting TIMESTAMP_OLD_FIELD only temporary, and will
        replace this value by TIMESTAMP_DNUN_FIELD or NONE later when
5912
        information about all TIMESTAMP fields in table will be availiable.
5913 5914 5915

        If we have TIMESTAMP NULL column without explicit DEFAULT value
        we treat it as having DEFAULT NULL attribute.
5916
      */
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5917 5918 5919 5920 5921
      new_field->unireg_check= (on_update_value ?
                                Field::TIMESTAMP_UN_FIELD :
                                (new_field->flags & NOT_NULL_FLAG ?
                                 Field::TIMESTAMP_OLD_FIELD:
                                 Field::NONE));
5922
    }
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    break;
  case FIELD_TYPE_DATE:				// Old date type
    if (protocol_version != PROTOCOL_VERSION-1)
      new_field->sql_type=FIELD_TYPE_NEWDATE;
    /* fall trough */
  case FIELD_TYPE_NEWDATE:
    new_field->length=10;
    break;
  case FIELD_TYPE_TIME:
    new_field->length=10;
    break;
  case FIELD_TYPE_DATETIME:
    new_field->length=19;
    break;
  case FIELD_TYPE_SET:
    {
5939
      if (interval_list->elements > sizeof(longlong)*8)
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5940
      {
5941
	my_error(ER_TOO_BIG_SET, MYF(0), field_name); /* purecov: inspected */
5942
	DBUG_RETURN(NULL);
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5943
      }
5944
      new_field->pack_length= get_set_pack_length(interval_list->elements);
5945 5946 5947 5948 5949 5950 5951 5952 5953 5954 5955

      List_iterator<String> it(*interval_list);
      String *tmp;
      while ((tmp= it++))
        new_field->interval_list.push_back(tmp);
      /*
        Set fake length to 1 to pass the below conditions.
        Real length will be set in mysql_prepare_table()
        when we know the character set of the column
      */
      new_field->length= 1;
5956
      break;
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    }
  case FIELD_TYPE_ENUM:
    {
5960
      // Should be safe
5961
      new_field->pack_length= get_enum_pack_length(interval_list->elements);
5962

5963 5964 5965 5966 5967
      List_iterator<String> it(*interval_list);
      String *tmp;
      while ((tmp= it++))
        new_field->interval_list.push_back(tmp);
      new_field->length= 1; // See comment for FIELD_TYPE_SET above.
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5968
      break;
5969
   }
5970 5971
  case MYSQL_TYPE_VAR_STRING:
    DBUG_ASSERT(0);                             // Impossible
5972
    break;
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  case MYSQL_TYPE_BIT:
    {
      if (!length)
        new_field->length= 1;
      if (new_field->length > MAX_BIT_FIELD_LENGTH)
      {
5979
        my_error(ER_TOO_BIG_DISPLAYWIDTH, MYF(0), field_name,
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5980
                 MAX_BIT_FIELD_LENGTH);
5981
        DBUG_RETURN(NULL);
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5982 5983 5984 5985
      }
      new_field->pack_length= (new_field->length + 7) / 8;
      break;
    }
5986 5987
  case FIELD_TYPE_DECIMAL:
    DBUG_ASSERT(0); /* Was obsolete */
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5988 5989
  }

5990 5991 5992 5993 5994 5995 5996
  if (!(new_field->flags & BLOB_FLAG) &&
      ((new_field->length > max_field_charlength && type != FIELD_TYPE_SET && 
        type != FIELD_TYPE_ENUM &&
        (type != MYSQL_TYPE_VARCHAR || default_value)) ||
       (!new_field->length &&
        type != MYSQL_TYPE_STRING &&
        type != MYSQL_TYPE_VARCHAR && type != FIELD_TYPE_GEOMETRY)))
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5997
  {
5998 5999 6000 6001
    my_error((type == MYSQL_TYPE_VAR_STRING || type == MYSQL_TYPE_VARCHAR ||
              type == MYSQL_TYPE_STRING) ?  ER_TOO_BIG_FIELDLENGTH :
             ER_TOO_BIG_DISPLAYWIDTH,
             MYF(0),
6002
             field_name, max_field_charlength); /* purecov: inspected */
6003
    DBUG_RETURN(NULL);
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6004 6005 6006 6007
  }
  type_modifier&= AUTO_INCREMENT_FLAG;
  if ((~allowed_type_modifier) & type_modifier)
  {
6008
    my_error(ER_WRONG_FIELD_SPEC, MYF(0), field_name);
6009
    DBUG_RETURN(NULL);
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6010
  }
6011
  DBUG_RETURN(new_field);
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6012 6013
}

6014

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6015 6016 6017 6018 6019 6020 6021 6022
/* Store position for column in ALTER TABLE .. ADD column */

void store_position_for_column(const char *name)
{
  current_lex->last_field->after=my_const_cast(char*) (name);
}

bool
6023
add_proc_to_list(THD* thd, Item *item)
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{
  ORDER *order;
  Item	**item_ptr;

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6028
  if (!(order = (ORDER *) thd->alloc(sizeof(ORDER)+sizeof(Item*))))
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    return 1;
  item_ptr = (Item**) (order+1);
  *item_ptr= item;
  order->item=item_ptr;
  order->free_me=0;
6034
  thd->lex->proc_list.link_in_list((byte*) order,(byte**) &order->next);
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6035 6036 6037 6038 6039 6040 6041 6042
  return 0;
}


/* Fix escaping of _, % and \ in database and table names (for ODBC) */

static void remove_escape(char *name)
{
6043 6044
  if (!*name)					// For empty DB names
    return;
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6045 6046
  char *to;
#ifdef USE_MB
6047
  char *strend=name+(uint) strlen(name);
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6048 6049 6050 6051 6052
#endif
  for (to=name; *name ; name++)
  {
#ifdef USE_MB
    int l;
6053 6054
    if (use_mb(system_charset_info) &&
        (l = my_ismbchar(system_charset_info, name, strend)))
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    {
	while (l--)
	    *to++ = *name++;
	name--;
	continue;
    }
#endif
    if (*name == '\\' && name[1])
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6063
      name++;					// Skip '\\'
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    *to++= *name;
  }
  *to=0;
}

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


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6074
bool add_to_list(THD *thd, SQL_LIST &list,Item *item,bool asc)
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{
  ORDER *order;
  DBUG_ENTER("add_to_list");
6078
  if (!(order = (ORDER *) thd->alloc(sizeof(ORDER))))
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6079
    DBUG_RETURN(1);
6080 6081
  order->item_ptr= item;
  order->item= &order->item_ptr;
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6082 6083 6084
  order->asc = asc;
  order->free_me=0;
  order->used=0;
6085
  order->counter_used= 0;
6086
  list.link_in_list((byte*) order,(byte**) &order->next);
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  DBUG_RETURN(0);
}


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6091 6092 6093 6094 6095 6096 6097 6098 6099 6100 6101 6102 6103 6104 6105 6106 6107 6108 6109
/*
  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
    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
*/

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TABLE_LIST *st_select_lex::add_table_to_list(THD *thd,
					     Table_ident *table,
6112
					     LEX_STRING *alias,
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6113 6114
					     ulong table_options,
					     thr_lock_type lock_type,
6115 6116
					     List<String> *use_index_arg,
					     List<String> *ignore_index_arg,
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6117
                                             LEX_STRING *option)
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{
  register TABLE_LIST *ptr;
6120
  TABLE_LIST *previous_table_ref; /* The table preceding the current one. */
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6121
  char *alias_str;
6122
  LEX *lex= thd->lex;
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6123
  DBUG_ENTER("add_table_to_list");
6124
  LINT_INIT(previous_table_ref);
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  if (!table)
    DBUG_RETURN(0);				// End of memory
  alias_str= alias ? alias->str : table->table.str;
6129
  if (check_table_name(table->table.str,table->table.length) ||
6130
      table->db.str && check_db_name(table->db.str))
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6131
  {
6132
    my_error(ER_WRONG_TABLE_NAME, MYF(0), table->table.str);
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    DBUG_RETURN(0);
  }

  if (!alias)					/* Alias is case sensitive */
6137 6138 6139
  {
    if (table->sel)
    {
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6140 6141
      my_message(ER_DERIVED_MUST_HAVE_ALIAS,
                 ER(ER_DERIVED_MUST_HAVE_ALIAS), MYF(0));
6142 6143
      DBUG_RETURN(0);
    }
6144
    if (!(alias_str=thd->memdup(alias_str,table->table.length+1)))
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6145
      DBUG_RETURN(0);
6146
  }
6147
  if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
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6148
    DBUG_RETURN(0);				/* purecov: inspected */
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6149
  if (table->db.str)
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  {
    ptr->db= table->db.str;
    ptr->db_length= table->db.length;
  }
  else if (thd->db)
  {
    ptr->db= thd->db;
    ptr->db_length= thd->db_length;
  }
  else
  {
6161 6162
    /* The following can't be "" as we may do 'casedn_str()' on it */
    ptr->db= empty_c_string;
6163 6164
    ptr->db_length= 0;
  }
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6165
  if (thd->stmt_arena->is_stmt_prepare_or_first_sp_execute())
6166
    ptr->db= thd->strdup(ptr->db);
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6167

6168
  ptr->alias= alias_str;
6169 6170
  if (lower_case_table_names && table->table.length)
    my_casedn_str(files_charset_info, table->table.str);
6171 6172
  ptr->table_name=table->table.str;
  ptr->table_name_length=table->table.length;
6173
  ptr->lock_type=   lock_type;
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  ptr->updating=    test(table_options & TL_OPTION_UPDATING);
  ptr->force_index= test(table_options & TL_OPTION_FORCE_INDEX);
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6176
  ptr->ignore_leaves= test(table_options & TL_OPTION_IGNORE_LEAVES);
6177
  ptr->derived=	    table->sel;
6178 6179 6180
  if (!my_strcasecmp(system_charset_info, ptr->db,
                     information_schema_name.str))
  {
6181
    ST_SCHEMA_TABLE *schema_table= find_schema_table(thd, ptr->table_name);
6182 6183 6184
    if (!schema_table ||
        (schema_table->hidden && 
         lex->orig_sql_command == SQLCOM_END))  // not a 'show' command
6185
    {
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6186
      my_error(ER_UNKNOWN_TABLE, MYF(0),
6187
               ptr->table_name, information_schema_name.str);
6188 6189
      DBUG_RETURN(0);
    }
6190
    ptr->schema_table_name= ptr->table_name;
6191 6192
    ptr->schema_table= schema_table;
  }
6193
  ptr->select_lex=  lex->current_select;
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6194
  ptr->cacheable_table= 1;
6195 6196 6197 6198 6199 6200
  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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6201
  ptr->option= option ? option->str : 0;
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6202
  /* check that used name is unique */
6203
  if (lock_type != TL_IGNORE)
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6204
  {
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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 ;
6209
	 tables ;
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VIEW  
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6210
	 tables=tables->next_local)
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6211
    {
6212 6213
      if (!my_strcasecmp(table_alias_charset, alias_str, tables->alias) &&
	  !strcmp(ptr->db, tables->db))
6214
      {
6215
	my_error(ER_NONUNIQ_TABLE, MYF(0), alias_str); /* purecov: tested */
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	DBUG_RETURN(0);				/* purecov: tested */
      }
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    }
  }
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  /* Store the table reference preceding the current one. */
  if (table_list.elements > 0)
  {
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    /*
      table_list.next points to the last inserted TABLE_LIST->next_local'
      element
    */
    previous_table_ref= (TABLE_LIST*) (table_list.next -
                                       offsetof(TABLE_LIST, next_local));
6229
    DBUG_ASSERT(previous_table_ref);
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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;
6238
  }
6239

6240 6241 6242 6243 6244 6245
  /*
    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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6246
  table_list.link_in_list((byte*) ptr, (byte**) &ptr->next_local);
6247
  ptr->next_name_resolution_table= NULL;
6248
  /* Link table in global list (all used tables) */
6249
  lex->add_to_query_tables(ptr);
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  DBUG_RETURN(ptr);
}

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6253

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/*
  Initialize a new table list for a nested join

  SYNOPSIS
6258
    init_nested_join()
6259
    thd         current thread
6260

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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");
6280

6281 6282
  if (!(ptr= (TABLE_LIST*) thd->calloc(ALIGN_SIZE(sizeof(TABLE_LIST))+
                                       sizeof(NESTED_JOIN))))
6283
    DBUG_RETURN(1);
6284 6285 6286
  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
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    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;
6317
  NESTED_JOIN *nested_join;
6318
  DBUG_ENTER("end_nested_join");
6319

6320
  DBUG_ASSERT(embedding);
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  ptr= embedding;
  join_list= ptr->join_list;
  embedding= ptr->embedding;
6324
  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;
  }
6334
  else if (nested_join->join_list.elements == 0)
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  {
    join_list->pop();
6337
    ptr= 0;                                     // return value
6338
  }
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  DBUG_RETURN(ptr);
}


/*
  Nest last join operation

  SYNOPSIS
6347
    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;
6363
  List<TABLE_LIST> *embedded_list;
6364
  DBUG_ENTER("nest_last_join");
6365

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  if (!(ptr= (TABLE_LIST*) thd->calloc(ALIGN_SIZE(sizeof(TABLE_LIST))+
                                       sizeof(NESTED_JOIN))))
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    DBUG_RETURN(0);
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  nested_join= ptr->nested_join=
    ((NESTED_JOIN*) ((byte*) ptr + ALIGN_SIZE(sizeof(TABLE_LIST))));

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  ptr->embedding= embedding;
  ptr->join_list= join_list;
6374
  embedded_list= &nested_join->join_list;
6375
  embedded_list->empty();
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  for (uint i=0; i < 2; i++)
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  {
    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
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  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
*/

6462
TABLE_LIST *st_select_lex::convert_right_join()
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{
  TABLE_LIST *tab2= join_list->pop();
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  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
*/

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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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6505

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/*
  Create a new name resolution context for a JOIN ... ON clause.

  SYNOPSIS
    make_join_on_context()
    thd       pointer to current thread
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    left_op   left  operand of the JOIN
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    right_op  rigth operand of the JOIN

  DESCRIPTION
    Create a new name resolution context for a JOIN ... ON clause,
    and set the first and last leaves of the list of table references
    to be used for name resolution.

  RETURN
    A new context if all is OK
    NULL - if a memory allocation error occured
*/

Name_resolution_context *
make_join_on_context(THD *thd, TABLE_LIST *left_op, TABLE_LIST *right_op)
{
  Name_resolution_context *on_context;
6529
  if (!(on_context= new (thd->mem_root) Name_resolution_context))
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    return NULL;
  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();
  return on_context;
}


/*
  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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{
6558
  if (expr)
6559
  {
6560
    if (!b->on_expr)
6561
      b->on_expr= expr;
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    else
    {
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      /*
        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);
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    }
    b->on_expr->top_level_item();
6572
  }
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6573 6574 6575
}


6576
/*
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  Mark that there is a NATURAL JOIN or JOIN ... USING between two
  tables.
6579 6580 6581

  SYNOPSIS
    add_join_natural()
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    a			Left join argument
    b			Right join argument
    using_fields        Field names from USING clause
  
6586
  IMPLEMENTATION
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    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
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*/

6613
void add_join_natural(TABLE_LIST *a, TABLE_LIST *b, List<String> *using_fields)
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6614
{
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  b->natural_join= a;
  b->join_using_fields= using_fields;
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}

6619

6620
/*
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  Reload/resets privileges and the different caches.

  SYNOPSIS
    reload_acl_and_cache()
6625
    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.
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  RETURN
    0	 ok
6637
    !=0  error.  thd->killed or thd->net.report_error is set
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*/

6640 6641
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 */
6645
  bool tmp_write_to_binlog= 1;
6646

6647
  if (thd && thd->in_sub_stmt)
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  {
    my_error(ER_STMT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0), "FLUSH");
    return 1;
  }

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#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)))
      thd->store_globals();
    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;
    }
6675
    reset_mqh((LEX_USER *)NULL, TRUE);
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  }
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#endif
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  if (options & REFRESH_LOG)
  {
6680
    /*
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      Flush the normal query log, the update log, the binary log,
      the slow query log, and the relay log (if it exists).
6683
    */
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6684

6685
    /*
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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)
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    */
    tmp_write_to_binlog= 0;
6692 6693
    mysql_log.new_file(1);
    mysql_slow_log.new_file(1);
6694
    mysql_bin_log.rotate_and_purge(RP_FORCE_ROTATE);
6695
#ifdef HAVE_REPLICATION
6696
    pthread_mutex_lock(&LOCK_active_mi);
6697
    rotate_relay_log(active_mi);
6698
    pthread_mutex_unlock(&LOCK_active_mi);
6699
#endif
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    if (ha_flush_logs())
      result=1;
6702 6703
    if (flush_error_log())
      result=1;
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6704
  }
6705
#ifdef HAVE_QUERY_CACHE
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  if (options & REFRESH_QUERY_CACHE_FREE)
  {
6708
    query_cache.pack();				// FLUSH QUERY CACHE
6709
    options &= ~REFRESH_QUERY_CACHE;    // Don't flush cache, just free memory
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  }
  if (options & (REFRESH_TABLES | REFRESH_QUERY_CACHE))
  {
6713
    query_cache.flush();			// RESET QUERY CACHE
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6714
  }
6715
#endif /*HAVE_QUERY_CACHE*/
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  /*
    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)) 
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6721
  {
6722
    if ((options & REFRESH_READ_LOCK) && thd)
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6723
    {
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      /*
        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++)
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6735
        {
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          if ((*lock_p)->type == TL_WRITE)
          {
            my_error(ER_LOCK_OR_ACTIVE_TRANSACTION, MYF(0));
            return 1;
          }
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6741
        }
6742
      }
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      /*
	Writing to the binlog could cause deadlocks, as we don't log
	UNLOCK TABLES
      */
6747
      tmp_write_to_binlog= 0;
6748
      if (lock_global_read_lock(thd))
6749
	return 1;                               // Killed
6750 6751
      result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1,
                                 tables);
6752
      if (make_global_read_lock_block_commit(thd)) // Killed
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      {
        /* Don't leave things in a half-locked state */
        unlock_global_read_lock(thd);
        return 1;
      }
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6758
    }
6759 6760
    else
      result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1, tables);
6761
    my_dbopt_cleanup();
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  }
  if (options & REFRESH_HOSTS)
    hostname_cache_refresh();
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6765
  if (thd && (options & REFRESH_STATUS))
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    refresh_status();
  if (options & REFRESH_THREADS)
    flush_thread_cache();
6769
#ifdef HAVE_REPLICATION
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  if (options & REFRESH_MASTER)
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  {
    tmp_write_to_binlog= 0;
6773
    if (reset_master(thd))
6774
    {
6775
      result=1;
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      thd->fatal_error();                       // Ensure client get error
    }
6778
  }
6779
#endif
6780
#ifdef OPENSSL
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   if (options & REFRESH_DES_KEY_FILE)
   {
     if (des_key_file)
       result=load_des_key_file(des_key_file);
   }
#endif
6787
#ifdef HAVE_REPLICATION
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 if (options & REFRESH_SLAVE)
 {
6790
   tmp_write_to_binlog= 0;
6791
   pthread_mutex_lock(&LOCK_active_mi);
6792
   if (reset_slave(thd, active_mi))
6793
     result=1;
6794
   pthread_mutex_unlock(&LOCK_active_mi);
6795
 }
6796
#endif
6797
 if (options & REFRESH_USER_RESOURCES)
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   reset_mqh((LEX_USER *) NULL);
6799
 *write_to_binlog= tmp_write_to_binlog;
6800
 return result;
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}

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/*
  kill on thread

  SYNOPSIS
    kill_one_thread()
    thd			Thread class
    id			Thread id

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

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void kill_one_thread(THD *thd, ulong id, bool only_kill_query)
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{
  THD *tmp;
  uint error=ER_NO_SUCH_THREAD;
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  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For unlink from list
  I_List_iterator<THD> it(threads);
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  while ((tmp=it++))
  {
    if (tmp->thread_id == id)
    {
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      pthread_mutex_lock(&tmp->LOCK_delete);	// Lock from delete
      break;
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    }
  }
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
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  if (tmp)
  {
6832 6833
    if ((thd->security_ctx->master_access & SUPER_ACL) ||
	!strcmp(thd->security_ctx->user, tmp->security_ctx->user))
6834
    {
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      tmp->awake(only_kill_query ? THD::KILL_QUERY : THD::KILL_CONNECTION);
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      error=0;
    }
    else
      error=ER_KILL_DENIED_ERROR;
    pthread_mutex_unlock(&tmp->LOCK_delete);
  }

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  if (!error)
6844
    send_ok(thd);
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  else
6846
    my_error(error, MYF(0), id);
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}

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/* Clear most status variables */

static void refresh_status(void)
{
  pthread_mutex_lock(&LOCK_status);
  for (struct show_var_st *ptr=status_vars; ptr->name; ptr++)
  {
    if (ptr->type == SHOW_LONG)
6858
      *(ulong*) ptr->value= 0;
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    else if (ptr->type == SHOW_LONG_STATUS)
    {
      THD *thd= current_thd;
      /* We must update the global status before cleaning up the thread */
      add_to_status(&global_status_var, &thd->status_var);
      bzero((char*) &thd->status_var, sizeof(thd->status_var));
    }
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bk@work.mysql.com committed
6866
  }
timour@mysql.com's avatar
timour@mysql.com committed
6867 6868
  /* Reset the counters of all key caches (default and named). */
  process_key_caches(reset_key_cache_counters);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6869 6870
  pthread_mutex_unlock(&LOCK_status);
}
6871 6872 6873 6874


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

6875 6876
static bool append_file_to_dir(THD *thd, const char **filename_ptr,
			       const char *table_name)
6877
{
6878
  char buff[FN_REFLEN],*ptr, *end;
6879 6880 6881 6882 6883 6884 6885
  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))
  {
6886
    my_error(ER_WRONG_TABLE_NAME, MYF(0), *filename_ptr);
6887 6888 6889 6890
    return 1;
  }
  /* Fix is using unix filename format on dos */
  strmov(buff,*filename_ptr);
6891
  end=convert_dirname(buff, *filename_ptr, NullS);
6892
  if (!(ptr=thd->alloc((uint) (end-buff)+(uint) strlen(table_name)+1)))
6893 6894
    return 1;					// End of memory
  *filename_ptr=ptr;
6895
  strxmov(ptr,buff,table_name,NullS);
6896 6897
  return 0;
}
6898

6899

6900 6901 6902 6903 6904 6905 6906 6907 6908 6909 6910 6911 6912 6913
/*
  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;
6914 6915
  LEX *lex= thd->lex;
  if (lex->current_select != &lex->select_lex)
6916 6917
  {
    char command[80];
6918 6919
    strmake(command, lex->yylval->symbol.str,
	    min(lex->yylval->symbol.length, sizeof(command)-1));
6920
    my_error(ER_CANT_USE_OPTION_HERE, MYF(0), command);
6921 6922 6923 6924
    return 1;
  }
  return 0;
}
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bell@sanja.is.com.ua committed
6925

6926

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bell@sanja.is.com.ua committed
6927
Comp_creator *comp_eq_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6928
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6929
  return invert?(Comp_creator *)&ne_creator:(Comp_creator *)&eq_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6930 6931
}

6932

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bell@sanja.is.com.ua committed
6933
Comp_creator *comp_ge_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6934
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6935
  return invert?(Comp_creator *)&lt_creator:(Comp_creator *)&ge_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6936 6937
}

6938

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bell@sanja.is.com.ua committed
6939
Comp_creator *comp_gt_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6940
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6941
  return invert?(Comp_creator *)&le_creator:(Comp_creator *)&gt_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6942 6943
}

6944

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bell@sanja.is.com.ua committed
6945
Comp_creator *comp_le_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6946
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6947
  return invert?(Comp_creator *)&gt_creator:(Comp_creator *)&le_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6948 6949
}

6950

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bell@sanja.is.com.ua committed
6951
Comp_creator *comp_lt_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6952
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6953
  return invert?(Comp_creator *)&ge_creator:(Comp_creator *)&lt_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6954 6955
}

6956

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bell@sanja.is.com.ua committed
6957
Comp_creator *comp_ne_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6958
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6959
  return invert?(Comp_creator *)&eq_creator:(Comp_creator *)&ne_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6960
}
6961 6962 6963 6964 6965 6966 6967 6968 6969 6970 6971 6972 6973 6974 6975 6976 6977 6978 6979 6980


/*
  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
6981
  if ((cmp == &comp_eq_creator) && !all)       //  = ANY <=> IN
6982
    return new Item_in_subselect(left_expr, select_lex);
serg@serg.mylan's avatar
serg@serg.mylan committed
6983 6984

  if ((cmp == &comp_ne_creator) && all)        // <> ALL <=> NOT IN
6985 6986 6987
    return new Item_func_not(new Item_in_subselect(left_expr, select_lex));

  Item_allany_subselect *it=
6988
    new Item_allany_subselect(left_expr, (*cmp)(all), select_lex, all);
6989
  if (all)
6990
    return it->upper_item= new Item_func_not_all(it);	/* ALL */
6991

6992
  return it->upper_item= new Item_func_nop_all(it);      /* ANY/SOME */
6993
}
6994 6995


6996 6997 6998 6999 7000 7001 7002 7003 7004 7005 7006 7007
/*
  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.
*/

7008
bool mysql_create_index(THD *thd, TABLE_LIST *table_list, List<Key> &keys)
7009 7010
{
  List<create_field> fields;
7011 7012
  ALTER_INFO alter_info;
  alter_info.flags= ALTER_ADD_INDEX;
7013 7014 7015 7016 7017
  HA_CREATE_INFO create_info;
  DBUG_ENTER("mysql_create_index");
  bzero((char*) &create_info,sizeof(create_info));
  create_info.db_type=DB_TYPE_DEFAULT;
  create_info.default_table_charset= thd->variables.collation_database;
7018
  DBUG_RETURN(mysql_alter_table(thd,table_list->db,table_list->table_name,
7019
				&create_info, table_list,
7020
				fields, keys, 0, (ORDER*)0,
monty@mysql.com's avatar
monty@mysql.com committed
7021
				DUP_ERROR, 0, &alter_info, 1));
7022 7023 7024
}


7025
bool mysql_drop_index(THD *thd, TABLE_LIST *table_list, ALTER_INFO *alter_info)
7026 7027 7028 7029 7030 7031 7032 7033
{
  List<create_field> fields;
  List<Key> keys;
  HA_CREATE_INFO create_info;
  DBUG_ENTER("mysql_drop_index");
  bzero((char*) &create_info,sizeof(create_info));
  create_info.db_type=DB_TYPE_DEFAULT;
  create_info.default_table_charset= thd->variables.collation_database;
7034 7035
  alter_info->clear();
  alter_info->flags= ALTER_DROP_INDEX;
7036
  DBUG_RETURN(mysql_alter_table(thd,table_list->db,table_list->table_name,
7037
				&create_info, table_list,
7038
				fields, keys, 0, (ORDER*)0,
monty@mysql.com's avatar
monty@mysql.com committed
7039
				DUP_ERROR, 0, alter_info, 1));
7040
}
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merge  
bell@sanja.is.com.ua committed
7041 7042


7043 7044 7045 7046 7047
/*
  Multi update query pre-check

  SYNOPSIS
    multi_update_precheck()
7048
    thd		Thread handler
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
7049
    tables	Global/local table list (have to be the same)
7050

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7051
  RETURN VALUE
7052 7053
    FALSE OK
    TRUE  Error
7054
*/
7055

7056
bool multi_update_precheck(THD *thd, TABLE_LIST *tables)
7057 7058 7059 7060 7061
{
  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
7062
  DBUG_ENTER("multi_update_precheck");
7063 7064 7065

  if (select_lex->item_list.elements != lex->value_list.elements)
  {
7066
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
7067
    DBUG_RETURN(TRUE);
7068 7069 7070 7071 7072
  }
  /*
    Ensure that we have UPDATE or SELECT privilege for each table
    The exact privilege is checked in mysql_multi_update()
  */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
7073
  for (table= tables; table; table= table->next_local)
7074
  {
7075 7076 7077
    if (table->derived)
      table->grant.privilege= SELECT_ACL;
    else if ((check_access(thd, UPDATE_ACL, table->db,
7078 7079
                           &table->grant.privilege, 0, 1,
                           test(table->schema_table)) ||
7080 7081
              grant_option &&
              check_grant(thd, UPDATE_ACL, table, 0, 1, 1)) &&
monty@mysql.com's avatar
monty@mysql.com committed
7082
             (check_access(thd, SELECT_ACL, table->db,
7083 7084
                           &table->grant.privilege, 0, 0,
                           test(table->schema_table)) ||
monty@mysql.com's avatar
monty@mysql.com committed
7085
              grant_option && check_grant(thd, SELECT_ACL, table, 0, 1, 0)))
7086
      DBUG_RETURN(TRUE);
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bell@sanja.is.com.ua committed
7087

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
7088
    table->table_in_first_from_clause= 1;
7089
  }
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7090 7091 7092
  /*
    Is there tables of subqueries?
  */
7093
  if (&lex->select_lex != lex->all_selects_list || lex->time_zone_tables_used)
7094
  {
7095
    DBUG_PRINT("info",("Checking sub query list"));
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
7096
    for (table= tables; table; table= table->next_global)
7097
    {
monty@mysql.com's avatar
monty@mysql.com committed
7098 7099 7100
      if (!my_tz_check_n_skip_implicit_tables(&table,
                                              lex->time_zone_tables_used) &&
          !table->table_in_first_from_clause)
7101 7102
      {
	if (check_access(thd, SELECT_ACL, table->db,
7103 7104
			 &table->grant.privilege, 0, 0,
                         test(table->schema_table)) ||
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bell@sanja.is.com.ua committed
7105
	    grant_option && check_grant(thd, SELECT_ACL, table, 0, 1, 0))
7106
	  DBUG_RETURN(TRUE);
7107 7108 7109 7110 7111 7112
      }
    }
  }

  if (select_lex->order_list.elements)
    msg= "ORDER BY";
7113
  else if (select_lex->select_limit)
7114 7115 7116 7117
    msg= "LIMIT";
  if (msg)
  {
    my_error(ER_WRONG_USAGE, MYF(0), "UPDATE", msg);
7118
    DBUG_RETURN(TRUE);
7119
  }
7120
  DBUG_RETURN(FALSE);
7121 7122 7123 7124 7125 7126 7127
}

/*
  Multi delete query pre-check

  SYNOPSIS
    multi_delete_precheck()
7128
    thd			Thread handler
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VIEW  
bell@sanja.is.com.ua committed
7129
    tables		Global/local table list
7130

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7131
  RETURN VALUE
7132 7133
    FALSE OK
    TRUE  error
7134
*/
7135

7136
bool multi_delete_precheck(THD *thd, TABLE_LIST *tables)
7137 7138 7139 7140
{
  SELECT_LEX *select_lex= &thd->lex->select_lex;
  TABLE_LIST *aux_tables=
    (TABLE_LIST *)thd->lex->auxilliary_table_list.first;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
7141
  DBUG_ENTER("multi_delete_precheck");
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7142

7143 7144 7145 7146 7147
  /* sql_yacc guarantees that tables and aux_tables are not zero */
  DBUG_ASSERT(aux_tables != 0);
  if (check_db_used(thd, tables) || check_db_used(thd,aux_tables) ||
      check_table_access(thd,SELECT_ACL, tables,0) ||
      check_table_access(thd,DELETE_ACL, aux_tables,0))
7148
    DBUG_RETURN(TRUE);
7149 7150
  if ((thd->options & OPTION_SAFE_UPDATES) && !select_lex->where)
  {
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bell@sanja.is.com.ua committed
7151 7152
    my_message(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE,
               ER(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE), MYF(0));
7153
    DBUG_RETURN(TRUE);
7154
  }
7155 7156 7157 7158 7159 7160 7161 7162 7163 7164 7165 7166 7167 7168 7169 7170 7171 7172 7173 7174 7175 7176 7177 7178 7179 7180 7181
  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;

  for (target_tbl= (TABLE_LIST *)lex->auxilliary_table_list.first;
       target_tbl; target_tbl= target_tbl->next_local)
7182
  {
7183
    lex->table_count++;
7184 7185
    /* All tables in aux_tables must be found in FROM PART */
    TABLE_LIST *walk;
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VIEW  
bell@sanja.is.com.ua committed
7186
    for (walk= tables; walk; walk= walk->next_local)
7187
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7188 7189 7190
      if (!my_strcasecmp(table_alias_charset,
			 target_tbl->alias, walk->alias) &&
	  !strcmp(walk->db, target_tbl->db))
7191 7192 7193 7194
	break;
    }
    if (!walk)
    {
7195
      my_error(ER_UNKNOWN_TABLE, MYF(0),
7196
               target_tbl->table_name, "MULTI DELETE");
7197
      DBUG_RETURN(TRUE);
7198
    }
serg@serg.mylan's avatar
serg@serg.mylan committed
7199 7200 7201 7202 7203
    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
7204
    walk->updating= target_tbl->updating;
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bell@sanja.is.com.ua committed
7205
    walk->lock_type= target_tbl->lock_type;
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VIEW  
bell@sanja.is.com.ua committed
7206
    target_tbl->correspondent_table= walk;	// Remember corresponding table
7207
  }
7208
  DBUG_RETURN(FALSE);
7209 7210 7211
}


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bell@sanja.is.com.ua committed
7212 7213 7214 7215 7216
/*
  simple UPDATE query pre-check

  SYNOPSIS
    update_precheck()
7217 7218
    thd		Thread handler
    tables	Global table list
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bell@sanja.is.com.ua committed
7219 7220

  RETURN VALUE
7221 7222
    FALSE OK
    TRUE  Error
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bell@sanja.is.com.ua committed
7223
*/
7224

7225
bool update_precheck(THD *thd, TABLE_LIST *tables)
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bell@sanja.is.com.ua committed
7226 7227 7228 7229
{
  DBUG_ENTER("update_precheck");
  if (thd->lex->select_lex.item_list.elements != thd->lex->value_list.elements)
  {
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bell@sanja.is.com.ua committed
7230
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
7231
    DBUG_RETURN(TRUE);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7232
  }
7233 7234
  DBUG_RETURN(check_db_used(thd, tables) ||
	       check_one_table_access(thd, UPDATE_ACL, tables));
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bell@sanja.is.com.ua committed
7235 7236 7237 7238 7239 7240 7241 7242
}


/*
  simple DELETE query pre-check

  SYNOPSIS
    delete_precheck()
7243 7244
    thd		Thread handler
    tables	Global table list
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bell@sanja.is.com.ua committed
7245 7246

  RETURN VALUE
7247 7248
    FALSE  OK
    TRUE   error
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bell@sanja.is.com.ua committed
7249
*/
7250

7251
bool delete_precheck(THD *thd, TABLE_LIST *tables)
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bell@sanja.is.com.ua committed
7252 7253 7254
{
  DBUG_ENTER("delete_precheck");
  if (check_one_table_access(thd, DELETE_ACL, tables))
7255
    DBUG_RETURN(TRUE);
7256
  /* Set privilege for the WHERE clause */
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bell@sanja.is.com.ua committed
7257
  tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
7258
  DBUG_RETURN(FALSE);
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bell@sanja.is.com.ua committed
7259 7260 7261 7262 7263 7264 7265 7266
}


/*
  simple INSERT query pre-check

  SYNOPSIS
    insert_precheck()
7267 7268
    thd		Thread handler
    tables	Global table list
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bell@sanja.is.com.ua committed
7269 7270

  RETURN VALUE
7271 7272
    FALSE  OK
    TRUE   error
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bell@sanja.is.com.ua committed
7273
*/
7274

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merge  
bell@sanja.is.com.ua committed
7275
bool insert_precheck(THD *thd, TABLE_LIST *tables)
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bell@sanja.is.com.ua committed
7276 7277 7278 7279
{
  LEX *lex= thd->lex;
  DBUG_ENTER("insert_precheck");

7280 7281 7282 7283
  /*
    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
7284 7285 7286
  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
7287 7288

  if (check_one_table_access(thd, privilege, tables))
7289
    DBUG_RETURN(TRUE);
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bell@sanja.is.com.ua committed
7290

7291
  if (lex->update_list.elements != lex->value_list.elements)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7292
  {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7293
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
7294
    DBUG_RETURN(TRUE);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7295
  }
7296
  DBUG_RETURN(FALSE);
7297
}
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bell@sanja.is.com.ua committed
7298 7299 7300 7301 7302 7303 7304


/*
  CREATE TABLE query pre-check

  SYNOPSIS
    create_table_precheck()
7305 7306 7307
    thd			Thread handler
    tables		Global table list
    create_table	Table which will be created
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bell@sanja.is.com.ua committed
7308 7309

  RETURN VALUE
7310 7311
    FALSE   OK
    TRUE   Error
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bell@sanja.is.com.ua committed
7312
*/
7313

7314 7315
bool create_table_precheck(THD *thd, TABLE_LIST *tables,
                           TABLE_LIST *create_table)
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bell@sanja.is.com.ua committed
7316 7317
{
  LEX *lex= thd->lex;
7318 7319
  SELECT_LEX *select_lex= &lex->select_lex;
  ulong want_priv;
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merge  
bell@sanja.is.com.ua committed
7320
  bool error= TRUE;                                 // Error message is given
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bell@sanja.is.com.ua committed
7321
  DBUG_ENTER("create_table_precheck");
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  want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
              CREATE_TMP_ACL : CREATE_ACL);
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  lex->create_info.alias= create_table->alias;
  if (check_access(thd, want_priv, create_table->db,
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		   &create_table->grant.privilege, 0, 0,
                   test(create_table->schema_table)) ||
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      check_merge_table_access(thd, create_table->db,
			       (TABLE_LIST *)
			       lex->create_info.merge_list.first))
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    goto err;
  if (grant_option && want_priv != CREATE_TMP_ACL &&
      check_grant(thd, want_priv, create_table, 0, UINT_MAX, 0))
    goto err;

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

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#ifdef NOT_NECESSARY_TO_CHECK_CREATE_TABLE_EXIST_WHEN_PREPARING_STATEMENT
    /* This code throws an ill error for CREATE TABLE t1 SELECT * FROM t1 */
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    /*
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      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).
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    */
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    if (thd->stmt_arena->is_stmt_prepare_or_first_sp_execute())
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    {
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      /*
        For temporary tables we don't have to check if the created table exists
      */
      if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
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          find_table_in_global_list(tables, create_table->db,
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                                    create_table->table_name))
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      {
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	error= FALSE;
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        goto err;
      }
    }
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#endif
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    if (tables && check_table_access(thd, SELECT_ACL, tables,0))
      goto err;
  }
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merge  
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  error= FALSE;
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err:
  DBUG_RETURN(error);
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}
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/*
  negate given expression

  SYNOPSIS
    negate_expression()
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    thd  thread handler
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    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);
}
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/*
  Assign as view definer current user

  SYNOPSIS
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    default_view_definer()
    sctx		current security context
    definer             structure where it should be assigned
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  RETURN
    FALSE   OK
    TRUE    Error
*/

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bool default_view_definer(Security_context *sctx, st_lex_user *definer)
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{
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  definer->user.str= sctx->priv_user;
  definer->user.length= strlen(sctx->priv_user);
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  if (!*sctx->priv_host)
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  {
    my_error(ER_NO_VIEW_USER, MYF(0));
    return TRUE;
  }
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  definer->host.str= sctx->priv_host;
  definer->host.length= strlen(sctx->priv_host);
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  return FALSE;
}