sql_parse.cc 209 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
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   the Free Software Foundation; version 2 of the License.
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

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#define MYSQL_LEX 1
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#include "mysql_priv.h"
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#include "sql_repl.h"
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#include "rpl_filter.h"
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#include "repl_failsafe.h"
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#include <m_ctype.h>
#include <myisam.h>
#include <my_dir.h>

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

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

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

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

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

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bool begin_trans(THD *thd)
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{
  int error=0;
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  if (unlikely(thd->in_sub_stmt))
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  {
    my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0));
    return 1;
  }
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  if (thd->locked_tables)
  {
    thd->lock=thd->locked_tables;
    thd->locked_tables=0;			// Will be automatically closed
    close_thread_tables(thd);			// Free tables
  }
  if (end_active_trans(thd))
    error= -1;
  else
  {
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    LEX *lex= thd->lex;
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    thd->options|= OPTION_BEGIN;
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    thd->server_status|= SERVER_STATUS_IN_TRANS;
    if (lex->start_transaction_opt & MYSQL_START_TRANS_OPT_WITH_CONS_SNAPSHOT)
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      error= ha_start_consistent_snapshot(thd);
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  }
  return error;
}
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#ifdef HAVE_REPLICATION
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/*
  Returns true if all tables should be ignored
*/
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inline bool all_tables_not_ok(THD *thd, TABLE_LIST *tables)
{
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  return rpl_filter->is_on() && tables && !thd->spcont &&
         !rpl_filter->tables_ok(thd->db, tables);
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}
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#endif
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static bool some_non_temp_table_to_be_updated(THD *thd, TABLE_LIST *tables)
{
  for (TABLE_LIST *table= tables; table; table= table->next_global)
  {
    DBUG_ASSERT(table->db && table->table_name);
    if (table->updating &&
        !find_temporary_table(thd, table->db, table->table_name))
      return 1;
  }
  return 0;
}

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

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

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

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

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

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

  /*
    The following is used to preserver CF_ROW_COUNT during the
    a CALL or EXECUTE statement, so the value generated by the
    last called (or executed) statement is preserved.
    See mysql_execute_command() for how CF_ROW_COUNT is used.
  */
  sql_command_flags[SQLCOM_CALL]= 		CF_HAS_ROW_COUNT;
  sql_command_flags[SQLCOM_EXECUTE]= 		CF_HAS_ROW_COUNT;
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}

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bool is_update_query(enum enum_sql_command command)
{
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  DBUG_ASSERT(command >= 0 && command <= SQLCOM_END);
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  return (sql_command_flags[command] & CF_CHANGES_DATA) != 0;
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}
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void execute_init_command(THD *thd, sys_var_str *init_command_var,
			  rw_lock_t *var_mutex)
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{
  Vio* save_vio;
  ulong save_client_capabilities;

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  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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  save_client_capabilities= thd->client_capabilities;
  thd->client_capabilities|= CLIENT_MULTI_QUERIES;
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  /*
    We don't need return result of execution to client side.
    To forbid this we should set thd->net.vio to 0.
  */
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  save_vio= thd->net.vio;
  thd->net.vio= 0;
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  thd->net.no_send_error= 0;
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  dispatch_command(COM_QUERY, thd, thd->query, thd->query_length+1);
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  rw_unlock(var_mutex);
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  thd->client_capabilities= save_client_capabilities;
  thd->net.vio= save_vio;
}


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/*
  Execute commands from bootstrap_file.
  Used when creating the initial grant tables
*/
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pthread_handler_t handle_bootstrap(void *arg)
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{
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  THD *thd=(THD*) arg;
  FILE *file=bootstrap_file;
  char *buff;
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  const char* found_semicolon= NULL;
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  /* The following must be called before DBUG_ENTER */
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  thd->thread_stack= (char*) &thd;
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  if (my_thread_init() || thd->store_globals())
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  {
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#ifndef EMBEDDED_LIBRARY
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    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
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#endif
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    thd->fatal_error();
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    goto end;
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  }
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  DBUG_ENTER("handle_bootstrap");

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#ifndef EMBEDDED_LIBRARY
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  pthread_detach_this_thread();
  thd->thread_stack= (char*) &thd;
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#endif /* EMBEDDED_LIBRARY */
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  if (thd->variables.max_join_size == HA_POS_ERROR)
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    thd->options |= OPTION_BIG_SELECTS;

  thd->proc_info=0;
  thd->version=refresh_version;
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  thd->security_ctx->priv_user=
    thd->security_ctx->user= (char*) my_strdup("boot", MYF(MY_WME));
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  thd->security_ctx->priv_host[0]=0;
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  /*
    Make the "client" handle multiple results. This is necessary
    to enable stored procedures with SELECTs and Dynamic SQL
    in init-file.
  */
  thd->client_capabilities|= CLIENT_MULTI_RESULTS;
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  buff= (char*) thd->net.buff;
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  thd->init_for_queries();
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  while (fgets(buff, thd->net.max_packet, file))
  {
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    /* strlen() can't be deleted because fgets() doesn't return length */
    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.
      */
      /* purecov: begin tested */
      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);
      /* purecov: end */
    }
    if (thd->is_fatal_error)
      break;                                    /* purecov: inspected */
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    while (length && (my_isspace(thd->charset(), buff[length-1]) ||
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                      buff[length-1] == ';'))
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      length--;
    buff[length]=0;
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    /* Skip lines starting with delimiter */
    if (strncmp(buff, STRING_WITH_LEN("delimiter")) == 0)
      continue;

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    thd->query_length=length;
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    thd->query= thd->memdup_w_gap(buff, length+1, 
				  thd->db_length+1+QUERY_CACHE_FLAGS_SIZE);
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    thd->query[length] = '\0';
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    DBUG_PRINT("query",("%-.4096s",thd->query));
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    /*
      We don't need to obtain LOCK_thread_count here because in bootstrap
      mode we have only one thread.
    */
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    thd->query_id=next_query_id();
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    thd->set_time();
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    mysql_parse(thd, thd->query, length, & found_semicolon);
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    close_thread_tables(thd);			// Free tables
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    if (thd->is_fatal_error)
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      break;
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    if (thd->net.report_error)
    {
      /* The query failed, send error to log and abort bootstrap */
      net_send_error(thd);
      thd->fatal_error();
      break;
    }

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    free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
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#ifdef USING_TRANSACTIONS
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    free_root(&thd->transaction.mem_root,MYF(MY_KEEP_PREALLOC));
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#endif
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  }
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end:
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  /* Remember the exit code of bootstrap */
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  bootstrap_error= thd->is_fatal_error;

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

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#ifndef EMBEDDED_LIBRARY
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  (void) pthread_mutex_lock(&LOCK_thread_count);
  thread_count--;
  (void) pthread_mutex_unlock(&LOCK_thread_count);
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  (void) pthread_cond_broadcast(&COND_thread_count);
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  my_thread_end();
  pthread_exit(0);
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#endif
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  DBUG_RETURN(0);
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}


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

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

/* This works because items are allocated with sql_alloc() */
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void cleanup_items(Item *item)
{
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  DBUG_ENTER("cleanup_items");  
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  for (; item ; item=item->next)
    item->cleanup();
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  DBUG_VOID_RETURN;
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}

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/*
  Handle COM_TABLE_DUMP command

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

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

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

static
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int mysql_table_dump(THD *thd, LEX_STRING *db, char *tbl_name)
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{
  TABLE* table;
  TABLE_LIST* table_list;
  int error = 0;
  DBUG_ENTER("mysql_table_dump");
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  if (db->length == 0)
  {
    db->str= thd->db;            /* purecov: inspected */
    db->length= thd->db_length;  /* purecov: inspected */
  }
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  if (!(table_list = (TABLE_LIST*) thd->calloc(sizeof(TABLE_LIST))))
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    DBUG_RETURN(1); // out of memory
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  table_list->db= db->str;
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  table_list->table_name= table_list->alias= tbl_name;
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  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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  if (check_db_name(db))
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  {
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    /* purecov: begin inspected */
    my_error(ER_WRONG_DB_NAME ,MYF(0), db->str ? db->str : "NULL");
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    goto err;
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    /* purecov: end */
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  }
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  if (lower_case_table_names)
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    my_casedn_str(files_charset_info, tbl_name);
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  if (!(table=open_ltable(thd, table_list, TL_READ_NO_INSERT)))
    DBUG_RETURN(1);

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  if (check_one_table_access(thd, SELECT_ACL, table_list))
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    goto err;
  thd->free_list = 0;
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  thd->query_length=(uint) strlen(tbl_name);
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  thd->query = tbl_name;
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  if ((error = mysqld_dump_create_info(thd, table_list, -1)))
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  {
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    my_error(ER_GET_ERRNO, MYF(0), my_errno);
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    goto err;
  }
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  net_flush(&thd->net);
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  if ((error= table->file->dump(thd,-1)))
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    my_error(ER_GET_ERRNO, MYF(0), error);
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err:
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  DBUG_RETURN(error);
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}

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/*
  Ends the current transaction and (maybe) begin the next

  SYNOPSIS
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    end_trans()
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      thd            Current thread
      completion     Completion type

  RETURN
    0 - OK
*/

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int end_trans(THD *thd, enum enum_mysql_completiontype completion)
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{
  bool do_release= 0;
  int res= 0;
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  DBUG_ENTER("end_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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  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;
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    res= ha_commit(thd);
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    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_KEEP_LOG);
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    thd->no_trans_update.all= FALSE;
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    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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    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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    if (ha_rollback(thd))
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      res= -1;
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    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_KEEP_LOG);
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    thd->no_trans_update.all= FALSE;
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    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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  if (res < 0)
    my_error(thd->killed_errno(), MYF(0));
  else if ((res == 0) && do_release)
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    thd->killed= THD::KILL_CONNECTION;

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  DBUG_RETURN(res);
}
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#ifndef EMBEDDED_LIBRARY
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/*
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  Read one command from connection and execute it (query or simple command).
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  This function is called in loop from thread function.
  SYNOPSIS
    do_command()
  RETURN VALUE
    0  success
    1  request of thread shutdown (see dispatch_command() description)
*/

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

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  /*
    indicator of uninitialized lex => normal flow of errors handling
    (see my_message_sql)
  */
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  thd->lex->current_select= 0;
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  /*
    This thread will do a blocking read from the client which
    will be interrupted when the next command is received from
    the client, the connection is closed or "net_wait_timeout"
    number of seconds has passed
  */
  net_set_read_timeout(net, thd->variables.net_wait_timeout);

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  thd->clear_error();				// Clear error message
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  net_new_transaction(net);
  if ((packet_length=my_net_read(net)) == packet_error)
  {
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    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)
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    {
      statistic_increment(aborted_threads,&LOCK_status);
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      DBUG_RETURN(TRUE);			// We have to close it.
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    }
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    net_send_error(thd, net->last_errno, NullS);
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    net->error= 0;
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    DBUG_RETURN(FALSE);
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  }
  else
  {
    packet=(char*) net->read_pos;
    command = (enum enum_server_command) (uchar) packet[0];
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    if (command >= COM_END)
      command= COM_END;				// Wrong command
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    DBUG_PRINT("info",("Command on %s = %d (%s)",
		       vio_description(net->vio), command,
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		       command_name[command].str));
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  }
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  /* Restore read timeout value */
  net_set_read_timeout(net, thd->variables.net_read_timeout);

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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.
  */
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  DBUG_RETURN(dispatch_command(command,thd, packet+1, (uint) packet_length));
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}
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#endif  /* EMBEDDED_LIBRARY */
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/*
   Perform one connection-level (COM_XXXX) command.
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  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
*/
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bool dispatch_command(enum enum_server_command command, THD *thd,
		      char* packet, uint packet_length)
{
  NET *net= &thd->net;
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  bool error= 0;
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  DBUG_ENTER("dispatch_command");

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  if (thd->killed == THD::KILL_QUERY || thd->killed == THD::KILL_BAD_DATA)
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  {
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    thd->killed= THD::NOT_KILLED;
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    thd->mysys_var->abort= 0;
  }
702

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  thd->command=command;
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  /*
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    Commands which always take a long time are logged into
    the slow log only if opt_log_slow_admin_statements is set.
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  */
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  thd->enable_slow_log= TRUE;
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  thd->lex->sql_command= SQLCOM_END; /* to avoid confusing VIEW detectors */
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  thd->set_time();
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  VOID(pthread_mutex_lock(&LOCK_thread_count));
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  thd->query_id= global_query_id;
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  if (command != COM_STATISTICS && command != COM_PING)
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    next_query_id();
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  thread_running++;
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  /* TODO: set thd->lex->sql_command to SQLCOM_END here */
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  VOID(pthread_mutex_unlock(&LOCK_thread_count));
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  thd->server_status&=
           ~(SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED);
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  switch (command) {
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  case COM_INIT_DB:
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  {
    LEX_STRING tmp;
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    status_var_increment(thd->status_var.com_stat[SQLCOM_CHANGE_DB]);
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    thd->convert_string(&tmp, system_charset_info,
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			packet, packet_length-1, thd->charset());
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    if (!mysql_change_db(thd, &tmp, FALSE))
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    {
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      general_log_print(thd, command, "%s",thd->db);
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      send_ok(thd);
    }
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    break;
  }
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#ifdef HAVE_REPLICATION
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  case COM_REGISTER_SLAVE:
  {
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    if (!register_slave(thd, (uchar*)packet, packet_length))
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      send_ok(thd);
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    break;
  }
742
#endif
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  case COM_TABLE_DUMP:
744
  {
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    char *tbl_name;
    LEX_STRING db;
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    uint db_len= *(uchar*) packet;
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    if (db_len >= packet_length || db_len > NAME_LEN)
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    {
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      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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      break;
    }
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    uint tbl_len= *(uchar*) (packet + db_len + 1);
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    if (db_len+tbl_len+2 > packet_length || tbl_len > NAME_LEN)
    {
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      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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      break;
    }
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    status_var_increment(thd->status_var.com_other);
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    thd->enable_slow_log= opt_log_slow_admin_statements;
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    db.str= thd->alloc(db_len + tbl_len + 2);
    db.length= db_len;
    if (!db.str)
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    {
      my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
      break;
    }
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    tbl_name= strmake(db.str, packet + 1, db_len)+1;
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    strmake(tbl_name, packet + db_len + 2, tbl_len);
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    mysql_table_dump(thd, &db, tbl_name);
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    break;
  }
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  case COM_CHANGE_USER:
  {
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    status_var_increment(thd->status_var.com_other);
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    char *user= (char*) packet, *packet_end= packet+ packet_length;
    char *passwd= strend(user)+1;

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    thd->change_user();
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    thd->clear_error();                         // if errors from rollback
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    /*
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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).
    */
788
    char db_buff[NAME_LEN+1];                 // buffer to store db in utf8
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    char *db= passwd;
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    char *save_db;
    uint passwd_len= (thd->client_capabilities & CLIENT_SECURE_CONNECTION ?
                      *passwd++ : strlen(passwd));
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    uint dummy_errors, save_db_length, db_length;
    int res;
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    Security_context save_security_ctx= *thd->security_ctx;
    USER_CONN *save_user_connect;

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    db+= passwd_len + 1;
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#ifndef EMBEDDED_LIBRARY
800
    /* Small check for incoming packet */
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    if ((uint) ((uchar*) db - net->read_pos) > packet_length)
802
    {
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      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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      break;
    }
806
#endif
807
    /* Convert database name to utf8 */
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    /*
      Handle problem with old bug in client protocol where db had an extra
      \0
    */
    db_length= (packet_end - db);
    if (db_length > 0 && db[db_length-1] == 0)
      db_length--;
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    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
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                             system_charset_info, db, db_length,
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                             thd->charset(), &dummy_errors)]= 0;
818
    db= db_buff;
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    /* Save user and privileges */
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    save_db_length= thd->db_length;
    save_db= thd->db;
    save_user_connect= thd->user_connect;
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    if (!(thd->security_ctx->user= my_strdup(user, MYF(0))))
826
    {
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      thd->security_ctx->user= save_security_ctx.user;
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      my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
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      break;
    }
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    /* Clear variables that are allocated */
    thd->user_connect= 0;
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    res= check_user(thd, COM_CHANGE_USER, passwd, passwd_len, db, FALSE);
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836 837
    if (res)
    {
838
      /* authentication failure, we shall restore old user */
839
      if (res > 0)
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        my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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      else
        thd->clear_error();                     // Error already sent to client
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      x_free(thd->security_ctx->user);
      *thd->security_ctx= save_security_ctx;
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      thd->user_connect= save_user_connect;
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      thd->db= save_db;
      thd->db_length= save_db_length;
    }
    else
    {
851
#ifndef NO_EMBEDDED_ACCESS_CHECKS
852
      /* we've authenticated new user */
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      if (save_user_connect)
	decrease_user_connections(save_user_connect);
855
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
856
      x_free((gptr) save_db);
857
      x_free((gptr)  save_security_ctx.user);
858
    }
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    break;
  }
861
  case COM_STMT_EXECUTE:
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  {
863
    mysql_stmt_execute(thd, packet, packet_length);
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    break;
  }
866
  case COM_STMT_FETCH:
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  {
    mysql_stmt_fetch(thd, packet, packet_length);
    break;
  }
871
  case COM_STMT_SEND_LONG_DATA:
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  {
873
    mysql_stmt_get_longdata(thd, packet, packet_length);
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    break;
  }
876
  case COM_STMT_PREPARE:
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  {
878
    mysql_stmt_prepare(thd, packet, packet_length);
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    break;
  }
881
  case COM_STMT_CLOSE:
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  {
883
    mysql_stmt_close(thd, packet);
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    break;
  }
886
  case COM_STMT_RESET:
887 888 889 890
  {
    mysql_stmt_reset(thd, packet);
    break;
  }
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  case COM_QUERY:
  {
893 894
    if (alloc_query(thd, packet, packet_length))
      break;					// fatal error is set
895
    char *packet_end= thd->query + thd->query_length;
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    /* 'b' stands for 'buffer' parameter', special for 'my_snprintf' */
    const char *format= "%.*b";
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    const char* found_semicolon= NULL;

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    general_log_print(thd, command, format, thd->query_length, thd->query);
901
    DBUG_PRINT("query",("%-.4096s",thd->query));
902 903 904 905

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

906
    mysql_parse(thd, thd->query, thd->query_length, & found_semicolon);
907

908
    while (!thd->killed && found_semicolon && !thd->net.report_error)
909
    {
910
      char *next_packet= (char*) found_semicolon;
911
      net->no_send_error= 0;
912
      /*
913 914
        Multiple queries exits, execute them individually
      */
915 916
      if (thd->lock || thd->open_tables || thd->derived_tables ||
          thd->prelocked_mode)
917
        close_thread_tables(thd);
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      ulong length= (ulong)(packet_end - next_packet);
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920
      log_slow_statement(thd);
921

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      /* Remove garbage at start of query */
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      while (my_isspace(thd->charset(), *next_packet) && length > 0)
924
      {
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        next_packet++;
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        length--;
      }
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      VOID(pthread_mutex_lock(&LOCK_thread_count));
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      thd->query_length= length;
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      thd->query= next_packet;
931
      thd->query_id= next_query_id();
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      thd->set_time(); /* Reset the query start time. */
933
      /* TODO: set thd->lex->sql_command to SQLCOM_END here */
934
      VOID(pthread_mutex_unlock(&LOCK_thread_count));
935
      mysql_parse(thd, next_packet, length, & found_semicolon);
936 937
    }

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    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),WAIT_PRIOR);
    DBUG_PRINT("info",("query ready"));
    break;
  }
943
  case COM_FIELD_LIST:				// This isn't actually needed
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#ifdef DONT_ALLOW_SHOW_COMMANDS
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    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0));	/* purecov: inspected */
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    break;
#else
  {
950
    char *fields, *packet_end= packet + packet_length - 1, *arg_end;
951
    /* Locked closure of all tables */
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    TABLE_LIST table_list;
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    LEX_STRING conv_name;
954
    uint dummy;
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    /* used as fields initializator */
957
    lex_start(thd);
958

959
    status_var_increment(thd->status_var.com_stat[SQLCOM_SHOW_FIELDS]);
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    bzero((char*) &table_list,sizeof(table_list));
961
    if (thd->copy_db_to(&table_list.db, &dummy))
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      break;
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    /*
      We have name + wildcard in packet, separated by endzero
    */
    arg_end= strend(packet);
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    thd->convert_string(&conv_name, system_charset_info,
968
			packet, (uint) (arg_end - packet), thd->charset());
969
    table_list.alias= table_list.table_name= conv_name.str;
970
    packet= arg_end + 1;
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    if (!my_strcasecmp(system_charset_info, table_list.db,
973
                       INFORMATION_SCHEMA_NAME.str))
974 975 976 977 978 979
    {
      ST_SCHEMA_TABLE *schema_table= find_schema_table(thd, table_list.alias);
      if (schema_table)
        table_list.schema_table= schema_table;
    }

980
    thd->query_length= (uint) (packet_end - packet); // Don't count end \0
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    if (!(thd->query=fields=thd->memdup(packet,thd->query_length+1)))
      break;
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    general_log_print(thd, command, "%s %s", table_list.table_name, fields);
984
    if (lower_case_table_names)
985
      my_casedn_str(files_charset_info, table_list.table_name);
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    if (check_access(thd,SELECT_ACL,table_list.db,&table_list.grant.privilege,
988
		     0, 0, test(table_list.schema_table)))
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      break;
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    if (grant_option &&
	check_grant(thd, SELECT_ACL, &table_list, 2, UINT_MAX, 0))
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      break;
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    /* init structures for VIEW processing */
    table_list.select_lex= &(thd->lex->select_lex);
995 996 997 998

    lex_start(thd);
    mysql_reset_thd_for_next_command(thd);

999 1000 1001
    thd->lex->
      select_lex.table_list.link_in_list((byte*) &table_list,
                                         (byte**) &table_list.next_local);
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    thd->lex->add_to_query_tables(&table_list);
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1004 1005
    /* switch on VIEW optimisation: do not fill temporary tables */
    thd->lex->sql_command= SQLCOM_SHOW_FIELDS;
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    mysqld_list_fields(thd,&table_list,fields);
1007
    thd->lex->unit.cleanup();
1008
    thd->cleanup_after_query();
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    break;
  }
#endif
  case COM_QUIT:
1013
    /* We don't calculate statistics for this command */
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    general_log_print(thd, command, NullS);
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    net->error=0;				// Don't give 'abort' message
    error=TRUE;					// End server
    break;

1019
#ifdef REMOVED
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  case COM_CREATE_DB:				// QQ: To be removed
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    {
1022
      LEX_STRING db, alias;
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      HA_CREATE_INFO create_info;
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1025
      status_var_increment(thd->status_var.com_stat[SQLCOM_CREATE_DB]);
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      if (thd->LEX_STRING_make(&db, packet, packet_length -1) ||
          thd->LEX_STRING_make(&alias, db.str, db.length) ||
          check_db_name(&db))
1029
      {
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	my_error(ER_WRONG_DB_NAME, MYF(0), db.str ? db.str : "NULL");
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	break;
      }
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      if (check_access(thd, CREATE_ACL, db.str , 0, 1, 0,
                       is_schema_db(db.str)))
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	break;
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      general_log_print(thd, command, packet);
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      bzero(&create_info, sizeof(create_info));
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      mysql_create_db(thd, (lower_case_table_names == 2 ? alias.str : db.str),
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                      &create_info, 0);
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      break;
    }
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  case COM_DROP_DB:				// QQ: To be removed
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    {
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      status_var_increment(thd->status_var.com_stat[SQLCOM_DROP_DB]);
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      LEX_STRING db;

      if (thd->LEX_STRING_make(&db, packet, packet_length - 1) ||
          check_db_name(&db))
1049
      {
1050
	my_error(ER_WRONG_DB_NAME, MYF(0), db.str ? db.str : "NULL");
1051 1052
	break;
      }
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      if (check_access(thd, DROP_ACL, db.str, 0, 1, 0, is_schema_db(db.str)))
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	break;
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      if (thd->locked_tables || thd->active_transaction())
      {
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	my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                   ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
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	break;
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      }
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      general_log_print(thd, command, db.str);
      mysql_rm_db(thd, db.str, 0, 0);
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      break;
    }
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#endif
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#ifndef EMBEDDED_LIBRARY
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  case COM_BINLOG_DUMP:
    {
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      ulong pos;
      ushort flags;
      uint32 slave_server_id;

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      status_var_increment(thd->status_var.com_other);
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      thd->enable_slow_log= opt_log_slow_admin_statements;
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      if (check_global_access(thd, REPL_SLAVE_ACL))
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	break;
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      /* TODO: The following has to be changed to an 8 byte integer */
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      pos = uint4korr(packet);
      flags = uint2korr(packet + 4);
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      thd->server_id=0; /* avoid suicide */
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      if ((slave_server_id= uint4korr(packet+6))) // mysqlbinlog.server_id==0
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	kill_zombie_dump_threads(slave_server_id);
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      thd->server_id = slave_server_id;
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      general_log_print(thd, command, "Log: '%s'  Pos: %ld", packet+10,
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                      (long) pos);
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      mysql_binlog_send(thd, thd->strdup(packet + 10), (my_off_t) pos, flags);
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      unregister_slave(thd,1,1);
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      /*  fake COM_QUIT -- if we get here, the thread needs to terminate */
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      error = TRUE;
      net->error = 0;
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      break;
    }
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#endif
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  case COM_REFRESH:
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  {
    bool not_used;
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    status_var_increment(thd->status_var.com_stat[SQLCOM_FLUSH]);
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    ulong options= (ulong) (uchar) packet[0];
    if (check_global_access(thd,RELOAD_ACL))
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      break;
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    general_log_print(thd, command, NullS);
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    if (!reload_acl_and_cache(thd, options, (TABLE_LIST*) 0, &not_used))
      send_ok(thd);
    break;
  }
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#ifndef EMBEDDED_LIBRARY
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  case COM_SHUTDOWN:
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  {
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    status_var_increment(thd->status_var.com_other);
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    if (check_global_access(thd,SHUTDOWN_ACL))
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      break; /* purecov: inspected */
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    /*
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      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].
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    */
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    enum mysql_enum_shutdown_level level=
      (enum mysql_enum_shutdown_level) (uchar) packet[0];
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    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;
    }
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    DBUG_PRINT("quit",("Got shutdown command for level %u", level));
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    general_log_print(thd, command, NullS);
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    send_eof(thd);
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#ifdef __WIN__
    sleep(1);					// must wait after eof()
#endif
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    /*
      The client is next going to send a COM_QUIT request (as part of
      mysql_close()). Make the life simpler for the client by sending
      the response for the coming COM_QUIT in advance
    */
    send_eof(thd);
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    close_connection(thd, 0, 1);
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    close_thread_tables(thd);			// Free before kill
    kill_mysql();
    error=TRUE;
    break;
1146
  }
1147
#endif
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  case COM_STATISTICS:
  {
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    STATUS_VAR current_global_status_var;
    ulong uptime;
    uint length;
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    ulonglong queries_per_second1000;
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#ifndef EMBEDDED_LIBRARY
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    char buff[250];
    uint buff_len= sizeof(buff);
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#else
    char *buff= thd->net.last_error;
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    uint buff_len= sizeof(thd->net.last_error);
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#endif
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    general_log_print(thd, command, NullS);
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    status_var_increment(thd->status_var.com_stat[SQLCOM_SHOW_STATUS]);
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    calc_sum_of_all_status(&current_global_status_var);
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    if (!(uptime= (ulong) (thd->start_time - server_start_time)))
      queries_per_second1000= 0;
    else
      queries_per_second1000= thd->query_id * LL(1000) / uptime;

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    length= my_snprintf((char*) buff, buff_len - 1,
                        "Uptime: %lu  Threads: %d  Questions: %lu  "
                        "Slow queries: %lu  Opens: %lu  Flush tables: %lu  "
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                        "Open tables: %u  Queries per second avg: %u.%u",
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                        uptime,
                        (int) thread_count, (ulong) thd->query_id,
                        current_global_status_var.long_query_count,
                        current_global_status_var.opened_tables,
                        refresh_version,
                        cached_open_tables(),
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                        (uint) (queries_per_second1000 / 1000),
                        (uint) (queries_per_second1000 % 1000));
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#ifdef SAFEMALLOC
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    if (sf_malloc_cur_memory)				// Using SAFEMALLOC
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    {
      char *end= buff + length;
      length+= my_snprintf(end, buff_len - length - 1,
                           end,"  Memory in use: %ldK  Max memory used: %ldK",
                           (sf_malloc_cur_memory+1023L)/1024L,
                           (sf_malloc_max_memory+1023L)/1024L);
    }
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#endif
#ifndef EMBEDDED_LIBRARY
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    VOID(my_net_write(net, buff, length));
      VOID(net_flush(net));
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#endif
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    break;
  }
  case COM_PING:
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    status_var_increment(thd->status_var.com_other);
1200
    send_ok(thd);				// Tell client we are alive
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    break;
  case COM_PROCESS_INFO:
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    status_var_increment(thd->status_var.com_stat[SQLCOM_SHOW_PROCESSLIST]);
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    if (!thd->security_ctx->priv_user[0] &&
        check_global_access(thd, PROCESS_ACL))
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      break;
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    general_log_print(thd, command, NullS);
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    mysqld_list_processes(thd,
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			  thd->security_ctx->master_access & PROCESS_ACL ? 
			  NullS : thd->security_ctx->priv_user, 0);
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    break;
  case COM_PROCESS_KILL:
  {
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    status_var_increment(thd->status_var.com_stat[SQLCOM_KILL]);
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    ulong id=(ulong) uint4korr(packet);
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    sql_kill(thd,id,false);
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    break;
  }
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  case COM_SET_OPTION:
  {
1221
    status_var_increment(thd->status_var.com_stat[SQLCOM_SET_OPTION]);
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    uint opt_command= uint2korr(packet);

    switch (opt_command) {
    case (int) MYSQL_OPTION_MULTI_STATEMENTS_ON:
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      thd->client_capabilities|= CLIENT_MULTI_STATEMENTS;
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      send_eof(thd);
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      break;
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    case (int) MYSQL_OPTION_MULTI_STATEMENTS_OFF:
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      thd->client_capabilities&= ~CLIENT_MULTI_STATEMENTS;
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      send_eof(thd);
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      break;
    default:
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      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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      break;
    }
    break;
  }
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  case COM_DEBUG:
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    status_var_increment(thd->status_var.com_other);
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    if (check_global_access(thd, SUPER_ACL))
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      break;					/* purecov: inspected */
1243
    mysql_print_status();
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    general_log_print(thd, command, NullS);
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    send_eof(thd);
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    break;
  case COM_SLEEP:
  case COM_CONNECT:				// Impossible here
  case COM_TIME:				// Impossible from client
  case COM_DELAYED_INSERT:
1251
  case COM_END:
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  default:
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    my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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    break;
  }
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  if (thd->lock || thd->open_tables || thd->derived_tables ||
      thd->prelocked_mode)
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  {
    thd->proc_info="closing tables";
    close_thread_tables(thd);			/* Free tables */
  }
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  /*
    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())
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    thd->transaction.xid_state.xid.null();
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  /* report error issued during command execution */
  if (thd->killed_errno() && !thd->net.report_error)
    thd->send_kill_message();
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  if (thd->net.report_error)
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    net_send_error(thd);
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1280
  log_slow_statement(thd);
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  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);
}


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void log_slow_statement(THD *thd)
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{
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  time_t start_of_query;
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  DBUG_ENTER("log_slow_statement");
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  /*
    The following should never be true with our current code base,
    but better to keep this here so we don't accidently try to log a
    statement in a trigger or stored function
  */
  if (unlikely(thd->in_sub_stmt))
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    DBUG_VOID_RETURN;                           // Don't set time for sub stmt
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  start_of_query= thd->start_time;
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  thd->end_time();				// Set start time
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  /*
    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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  {
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    thd->proc_info="logging slow query";

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    if ((ulong) (thd->start_time - thd->time_after_lock) >
	thd->variables.long_query_time ||
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	((thd->server_status &
	  (SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED)) &&
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	 (specialflag & SPECIAL_LOG_QUERIES_NOT_USING_INDEXES)))
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    {
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      thd->status_var.long_query_count++;
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      slow_log_print(thd, thd->query, thd->query_length, start_of_query);
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    }
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  }
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  DBUG_VOID_RETURN;
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}

1333

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/*
  Create a TABLE_LIST object for an INFORMATION_SCHEMA table.

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

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

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

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

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int prepare_schema_table(THD *thd, LEX *lex, Table_ident *table_ident,
                         enum enum_schema_tables schema_table_idx)
{
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  SELECT_LEX *schema_select_lex= NULL;
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  DBUG_ENTER("prepare_schema_table");
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1368
  switch (schema_table_idx) {
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  case SCH_SCHEMATA:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
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    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0));   /* purecov: inspected */
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    DBUG_RETURN(1);
#else
    break;
#endif
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  case SCH_TABLE_NAMES:
  case SCH_TABLES:
  case SCH_VIEWS:
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  case SCH_TRIGGERS:
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  case SCH_EVENTS:
1383
#ifdef DONT_ALLOW_SHOW_COMMANDS
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    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */
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    DBUG_RETURN(1);
#else
    {
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      LEX_STRING db;
      uint dummy;
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      if (lex->select_lex.db == NULL &&
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          thd->copy_db_to(&lex->select_lex.db, &dummy))
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      {
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        DBUG_RETURN(1);
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      }
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      schema_select_lex= new SELECT_LEX();
      db.str= schema_select_lex->db= lex->select_lex.db;
      schema_select_lex->table_list.first= NULL;
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      db.length= strlen(db.str);
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      if (check_db_name(&db))
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      {
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        my_error(ER_WRONG_DB_NAME, MYF(0), db.str);
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        DBUG_RETURN(1);
      }
      break;
    }
#endif
  case SCH_COLUMNS:
  case SCH_STATISTICS:
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  {
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#ifdef DONT_ALLOW_SHOW_COMMANDS
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    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */
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    DBUG_RETURN(1);
#else
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    DBUG_ASSERT(table_ident);
    TABLE_LIST **query_tables_last= lex->query_tables_last;
    schema_select_lex= new SELECT_LEX();
    /* 'parent_lex' is used in init_query() so it must be before it. */
    schema_select_lex->parent_lex= lex;
    schema_select_lex->init_query();
    if (!schema_select_lex->add_table_to_list(thd, table_ident, 0, 0, TL_READ))
      DBUG_RETURN(1);
    lex->query_tables_last= query_tables_last;
    break;
  }
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#endif
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  case SCH_OPEN_TABLES:
  case SCH_VARIABLES:
  case SCH_STATUS:
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  case SCH_PROCEDURES:
  case SCH_CHARSETS:
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  case SCH_ENGINES:
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  case SCH_COLLATIONS:
  case SCH_COLLATION_CHARACTER_SET_APPLICABILITY:
  case SCH_USER_PRIVILEGES:
  case SCH_SCHEMA_PRIVILEGES:
  case SCH_TABLE_PRIVILEGES:
  case SCH_COLUMN_PRIVILEGES:
  case SCH_TABLE_CONSTRAINTS:
  case SCH_KEY_COLUMN_USAGE:
  default:
    break;
  }
  
  SELECT_LEX *select_lex= lex->current_select;
  if (make_schema_select(thd, select_lex, schema_table_idx))
  {
    DBUG_RETURN(1);
  }
  TABLE_LIST *table_list= (TABLE_LIST*) select_lex->table_list.first;
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  table_list->schema_select_lex= schema_select_lex;
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  table_list->schema_table_reformed= 1;
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  DBUG_RETURN(0);
}


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

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

1473
bool alloc_query(THD *thd, const char *packet, uint packet_length)
1474 1475
{
  packet_length--;				// Remove end null
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  /* Remove garbage at start and end of query */
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  while (my_isspace(thd->charset(),packet[0]) && packet_length > 0)
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  {
    packet++;
    packet_length--;
  }
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  const char *pos= packet + packet_length;     // Point at end null
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  while (packet_length > 0 &&
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	 (pos[-1] == ';' || my_isspace(thd->charset() ,pos[-1])))
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  {
    pos--;
    packet_length--;
  }
  /* We must allocate some extra memory for query cache */
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  thd->query_length= 0;                        // Extra safety: Avoid races
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  if (!(thd->query= (char*) thd->memdup_w_gap((gptr) (packet),
					      packet_length,
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					      thd->db_length+ 1 +
					      QUERY_CACHE_FLAGS_SIZE)))
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    return TRUE;
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  thd->query[packet_length]=0;
  thd->query_length= packet_length;
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  /* Reclaim some memory */
  thd->packet.shrink(thd->variables.net_buffer_length);
  thd->convert_buffer.shrink(thd->variables.net_buffer_length);
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  return FALSE;
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}

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

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static
bool sp_process_definer(THD *thd)
{
  DBUG_ENTER("sp_process_definer");

  LEX *lex= thd->lex;

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

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

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

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

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

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

    lex->definer= create_default_definer(thd);

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

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

    if (thd->slave_thread)
      lex->sphead->m_chistics->suid= SP_IS_NOT_SUID;
  }
  else
  {
    /*
      If the specified definer differs from the current user, we
      should check that the current user has SUPER privilege (in order
      to create a stored routine under another user one must have
      SUPER privilege).
    */
    if ((strcmp(lex->definer->user.str, thd->security_ctx->priv_user) ||
         my_strcasecmp(system_charset_info, lex->definer->host.str,
                       thd->security_ctx->priv_host)) &&
        check_global_access(thd, SUPER_ACL))
    {
      my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), "SUPER");
      DBUG_RETURN(TRUE);
    }
  }

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

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

  DBUG_RETURN(FALSE);
}


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

  IMPLEMENTATION

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

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

  RETURN
    FALSE       OK
    TRUE        Error
*/
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bool
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mysql_execute_command(THD *thd)
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{
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  bool res= FALSE;
  bool need_start_waiting= FALSE; // have protection against global read lock
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  int  up_result= 0;
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  LEX  *lex= thd->lex;
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  /* first SELECT_LEX (have special meaning for many of non-SELECTcommands) */
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  SELECT_LEX *select_lex= &lex->select_lex;
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  /* first table of first SELECT_LEX */
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  TABLE_LIST *first_table= (TABLE_LIST*) select_lex->table_list.first;
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  /* list of all tables in query */
  TABLE_LIST *all_tables;
  /* most outer SELECT_LEX_UNIT of query */
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  SELECT_LEX_UNIT *unit= &lex->unit;
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  /* Saved variable value */
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  DBUG_ENTER("mysql_execute_command");
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  thd->net.no_send_error= 0;
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#ifdef WITH_PARTITION_STORAGE_ENGINE
  thd->work_part_info= 0;
#endif
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  /*
    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();
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  /* should be assigned after making first tables same */
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  all_tables= lex->query_tables;
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  /* set context for commands which do not use setup_tables */
  select_lex->
    context.resolve_in_table_list_only((TABLE_LIST*)select_lex->
                                       table_list.first);
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  /*
    Reset warning count for each query that uses tables
    A better approach would be to reset this for any commands
    that is not a SHOW command or a select that only access local
    variables, but for now this is probably good enough.
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    Don't reset warnings when executing a stored routine.
1684
  */
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  if ((all_tables || &lex->select_lex != lex->all_selects_list ||
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       lex->sroutines.records) && !thd->spcont)
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    mysql_reset_errors(thd, 0);
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#ifdef HAVE_REPLICATION
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  if (unlikely(thd->slave_thread))
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  {
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    if (lex->sql_command == SQLCOM_DROP_TRIGGER)
    {
      /*
        When dropping a trigger, we need to load its table name
        before checking slave filter rules.
      */
      add_table_for_trigger(thd, thd->lex->spname, 1, &all_tables);
      
      if (!all_tables)
      {
        /*
          If table name cannot be loaded,
          it means the trigger does not exists possibly because
          CREATE TRIGGER was previously skipped for this trigger
          according to slave filtering rules.
          Returning success without producing any errors in this case.
        */
        DBUG_RETURN(0);
      }
      
      // force searching in slave.cc:tables_ok() 
      all_tables->updating= 1;
    }
    
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    /*
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      Check if statment should be skipped because of slave filtering
      rules
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      Exceptions are:
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      - UPDATE MULTI: For this statement, we want to check the filtering
        rules later in the code
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      - SET: we always execute it (Not that many SET commands exists in
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        the binary log anyway -- only 4.1 masters write SET statements,
	in 5.0 there are no SET statements in the binary log)
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      - DROP TEMPORARY TABLE IF EXISTS: we always execute it (otherwise we
        have stale files on slave caused by exclusion of one tmp table).
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    */
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    if (!(lex->sql_command == SQLCOM_UPDATE_MULTI) &&
	!(lex->sql_command == SQLCOM_SET_OPTION) &&
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	!(lex->sql_command == SQLCOM_DROP_TABLE &&
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          lex->drop_temporary && lex->drop_if_exists) &&
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        all_tables_not_ok(thd, all_tables))
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    {
      /* we warn the slave SQL thread */
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      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
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      if (thd->one_shot_set)
      {
        /*
          It's ok to check thd->one_shot_set here:

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

          At least there seems to be problems in the rli cache for
          charsets if we are using ONE_SHOT.  Note that this is normally no
          problem because either the >= 5.0 slave reads a 4.1 binlog (with
          ONE_SHOT) *or* or 5.0 binlog (without ONE_SHOT) but never both."
        */
        reset_one_shot_variables(thd);
      }
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      DBUG_RETURN(0);
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    }
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  }
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  else
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  {
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#endif /* HAVE_REPLICATION */
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    /*
      When option readonly is set deny operations which change non-temporary
      tables. Except for the replication thread and the 'super' users.
    */
    if (opt_readonly &&
	!(thd->security_ctx->master_access & SUPER_ACL) &&
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	(sql_command_flags[lex->sql_command] & CF_CHANGES_DATA) &&
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        !((lex->sql_command == SQLCOM_CREATE_TABLE) &&
          (lex->create_info.options & HA_LEX_CREATE_TMP_TABLE)) &&
        !((lex->sql_command == SQLCOM_DROP_TABLE) && lex->drop_temporary) &&
        ((lex->sql_command != SQLCOM_UPDATE_MULTI) &&
          some_non_temp_table_to_be_updated(thd, all_tables)))
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    {
      my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
      DBUG_RETURN(-1);
    }
#ifdef HAVE_REPLICATION
  } /* endif unlikely slave */
#endif
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  status_var_increment(thd->status_var.com_stat[lex->sql_command]);
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  switch (lex->sql_command) {
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  case SQLCOM_SHOW_EVENTS:
    if ((res= check_access(thd, EVENT_ACL, thd->lex->select_lex.db, 0, 0, 0,
                           is_schema_db(thd->lex->select_lex.db))))
      break;
    /* fall through */
  case SQLCOM_SHOW_STATUS_PROC:
  case SQLCOM_SHOW_STATUS_FUNC:
    res= execute_sqlcom_select(thd, all_tables);
    break;
  case SQLCOM_SHOW_STATUS:
  {
    system_status_var old_status_var= thd->status_var;
    thd->initial_status_var= &old_status_var;
    res= execute_sqlcom_select(thd, all_tables);
    /* Don't log SHOW STATUS commands to slow query log */
    thd->server_status&= ~(SERVER_QUERY_NO_INDEX_USED |
                           SERVER_QUERY_NO_GOOD_INDEX_USED);
    /*
      restore status variables, as we don't want 'show status' to cause
      changes
    */
    pthread_mutex_lock(&LOCK_status);
    add_diff_to_status(&global_status_var, &thd->status_var,
                       &old_status_var);
    thd->status_var= old_status_var;
    pthread_mutex_unlock(&LOCK_status);
    break;
  }
  case SQLCOM_SHOW_DATABASES:
  case SQLCOM_SHOW_TABLES:
  case SQLCOM_SHOW_TRIGGERS:
  case SQLCOM_SHOW_TABLE_STATUS:
  case SQLCOM_SHOW_OPEN_TABLES:
  case SQLCOM_SHOW_PLUGINS:
  case SQLCOM_SHOW_FIELDS:
  case SQLCOM_SHOW_KEYS:
  case SQLCOM_SHOW_VARIABLES:
  case SQLCOM_SHOW_CHARSETS:
  case SQLCOM_SHOW_COLLATIONS:
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  case SQLCOM_SELECT:
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    thd->status_var.last_query_cost= 0.0;
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    if (all_tables)
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    {
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      res= check_table_access(thd,
                              lex->exchange ? SELECT_ACL | FILE_ACL :
                              SELECT_ACL,
                              all_tables, 0);
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    }
    else
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      res= check_access(thd,
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                        lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL,
                        any_db, 0, 0, 0, 0);
    if (!res)
      res= execute_sqlcom_select(thd, all_tables);
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    break;
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  case SQLCOM_PREPARE:
1838
  {
1839
    mysql_sql_stmt_prepare(thd);
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    break;
  }
  case SQLCOM_EXECUTE:
  {
1844
    mysql_sql_stmt_execute(thd);
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    break;
  }
  case SQLCOM_DEALLOCATE_PREPARE:
  {
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    mysql_sql_stmt_close(thd);
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    break;
  }
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  case SQLCOM_DO:
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    if (check_table_access(thd, SELECT_ACL, all_tables, 0) ||
        open_and_lock_tables(thd, all_tables))
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      goto error;
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    res= mysql_do(thd, *lex->insert_list);
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    break;

1860
  case SQLCOM_EMPTY_QUERY:
1861
    send_ok(thd);
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    break;

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

1868
#ifndef EMBEDDED_LIBRARY
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  case SQLCOM_PURGE:
1870
  {
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    if (check_global_access(thd, SUPER_ACL))
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      goto error;
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    /* PURGE MASTER LOGS TO 'file' */
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    res = purge_master_logs(thd, lex->to_log);
    break;
  }
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  case SQLCOM_PURGE_BEFORE:
  {
1879 1880
    Item *it;

1881 1882
    if (check_global_access(thd, SUPER_ACL))
      goto error;
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    /* PURGE MASTER LOGS BEFORE 'data' */
1884
    it= (Item *)lex->value_list.head();
1885
    if ((!it->fixed && it->fix_fields(lex->thd, &it)) ||
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        it->check_cols(1))
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    {
      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());
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    break;
  }
1900
#endif
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  case SQLCOM_SHOW_WARNS:
  {
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    res= mysqld_show_warnings(thd, (ulong)
			      ((1L << (uint) MYSQL_ERROR::WARN_LEVEL_NOTE) |
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			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_WARN) |
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR)
			       ));
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    break;
  }
  case SQLCOM_SHOW_ERRORS:
  {
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    res= mysqld_show_warnings(thd, (ulong)
			      (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR));
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    break;
  }
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  case SQLCOM_SHOW_NEW_MASTER:
  {
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    if (check_global_access(thd, REPL_SLAVE_ACL))
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      goto error;
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    /* This query don't work now. See comment in repl_failsafe.cc */
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#ifndef WORKING_NEW_MASTER
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    my_error(ER_NOT_SUPPORTED_YET, MYF(0), "SHOW NEW MASTER");
    goto error;
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#else
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    res = show_new_master(thd);
    break;
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#endif
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  }
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#ifdef HAVE_REPLICATION
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  case SQLCOM_SHOW_SLAVE_HOSTS:
  {
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    if (check_global_access(thd, REPL_SLAVE_ACL))
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      goto error;
    res = show_slave_hosts(thd);
    break;
  }
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  case SQLCOM_SHOW_BINLOG_EVENTS:
  {
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    if (check_global_access(thd, REPL_SLAVE_ACL))
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      goto error;
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    res = mysql_show_binlog_events(thd);
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    break;
  }
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#endif

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  case SQLCOM_BACKUP_TABLE:
1948
  {
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    DBUG_ASSERT(first_table == all_tables && first_table != 0);
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    if (check_table_access(thd, SELECT_ACL, all_tables, 0) ||
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	check_global_access(thd, FILE_ACL))
1952
      goto error; /* purecov: inspected */
1953
    thd->enable_slow_log= opt_log_slow_admin_statements;
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    res = mysql_backup_table(thd, first_table);
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    select_lex->table_list.first= (byte*) first_table;
1956
    lex->query_tables=all_tables;
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    break;
  }
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  case SQLCOM_RESTORE_TABLE:
1960
  {
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    DBUG_ASSERT(first_table == all_tables && first_table != 0);
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    if (check_table_access(thd, INSERT_ACL, all_tables, 0) ||
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	check_global_access(thd, FILE_ACL))
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      goto error; /* purecov: inspected */
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    thd->enable_slow_log= opt_log_slow_admin_statements;
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    res = mysql_restore_table(thd, first_table);
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    select_lex->table_list.first= (byte*) first_table;
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    lex->query_tables=all_tables;
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    break;
  }
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  case SQLCOM_ASSIGN_TO_KEYCACHE:
  {
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    DBUG_ASSERT(first_table == all_tables && first_table != 0);
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    if (check_access(thd, INDEX_ACL, first_table->db,
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                     &first_table->grant.privilege, 0, 0,
                     test(first_table->schema_table)))
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      goto error;
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    res= mysql_assign_to_keycache(thd, first_table, &lex->ident);
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    break;
  }
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  case SQLCOM_PRELOAD_KEYS:
  {
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    DBUG_ASSERT(first_table == all_tables && first_table != 0);
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    if (check_access(thd, INDEX_ACL, first_table->db,
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                     &first_table->grant.privilege, 0, 0,
                     test(first_table->schema_table)))
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      goto error;
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    res = mysql_preload_keys(thd, first_table);
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    break;
  }
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#ifdef HAVE_REPLICATION
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  case SQLCOM_CHANGE_MASTER:
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  {
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    if (check_global_access(thd, SUPER_ACL))
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      goto error;
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    pthread_mutex_lock(&LOCK_active_mi);
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    res = change_master(thd,active_mi);
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    pthread_mutex_unlock(&LOCK_active_mi);
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    break;
  }
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  case SQLCOM_SHOW_SLAVE_STAT:
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  {
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    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
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      goto error;
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    pthread_mutex_lock(&LOCK_active_mi);
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    res = show_master_info(thd,active_mi);
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    pthread_mutex_unlock(&LOCK_active_mi);
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    break;
  }
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  case SQLCOM_SHOW_MASTER_STAT:
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  {
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    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
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      goto error;
    res = show_binlog_info(thd);
    break;
  }
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  case SQLCOM_LOAD_MASTER_DATA: // sync with master
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    if (check_global_access(thd, SUPER_ACL))
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      goto error;
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    if (end_active_trans(thd))
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      goto error;
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    res = load_master_data(thd);
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    break;
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#endif /* HAVE_REPLICATION */
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  case SQLCOM_SHOW_ENGINE_STATUS:
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    {
2030
      if (check_global_access(thd, SUPER_ACL))
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        goto error;
      res = ha_show_status(thd, lex->create_info.db_type, HA_ENGINE_STATUS);
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      break;
    }
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2035
  case SQLCOM_SHOW_ENGINE_MUTEX:
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unknown committed
2036 2037
    {
      if (check_global_access(thd, SUPER_ACL))
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2038
        goto error;
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2039
      res = ha_show_status(thd, lex->create_info.db_type, HA_ENGINE_MUTEX);
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2040 2041
      break;
    }
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2042
#ifdef HAVE_REPLICATION
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2043
  case SQLCOM_LOAD_MASTER_TABLE:
2044
  {
unknown's avatar
VIEW  
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2045
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
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unknown committed
2046 2047
    DBUG_ASSERT(first_table->db); /* Must be set in the parser */

unknown's avatar
VIEW  
unknown committed
2048
    if (check_access(thd, CREATE_ACL, first_table->db,
2049 2050
		     &first_table->grant.privilege, 0, 0,
                     test(first_table->schema_table)))
unknown's avatar
unknown committed
2051 2052 2053 2054
      goto error;				/* purecov: inspected */
    if (grant_option)
    {
      /* Check that the first table has CREATE privilege */
unknown's avatar
VIEW  
unknown committed
2055
      if (check_grant(thd, CREATE_ACL, all_tables, 0, 1, 0))
2056
	goto error;
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unknown committed
2057
    }
2058
    pthread_mutex_lock(&LOCK_active_mi);
2059 2060 2061 2062
    /*
      fetch_master_table will send the error to the client on failure.
      Give error if the table already exists.
    */
2063
    if (!fetch_master_table(thd, first_table->db, first_table->table_name,
2064
			    active_mi, 0, 0))
2065
    {
2066
      send_ok(thd);
2067
    }
2068
    pthread_mutex_unlock(&LOCK_active_mi);
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2069
    break;
2070
  }
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2071
#endif /* HAVE_REPLICATION */
2072

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2073
  case SQLCOM_CREATE_TABLE:
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2074
  {
2075
    /* If CREATE TABLE of non-temporary table, do implicit commit */
2076 2077 2078 2079 2080 2081 2082 2083
    if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE))
    {
      if (end_active_trans(thd))
      {
	res= -1;
	break;
      }
    }
unknown's avatar
VIEW  
unknown committed
2084 2085 2086 2087 2088
    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;
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2089

unknown's avatar
VIEW  
unknown committed
2090
    if ((res= create_table_precheck(thd, select_tables, create_table)))
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2091
      goto end_with_restore_list;
unknown's avatar
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2092

2093
#ifndef HAVE_READLINK
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2094
    if (lex->create_info.data_file_name)
2095 2096
      push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
                   "DATA DIRECTORY option ignored");
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2097
    if (lex->create_info.index_file_name)
2098 2099
      push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
                   "INDEX DIRECTORY option ignored");
2100 2101
    lex->create_info.data_file_name=lex->create_info.index_file_name=0;
#else
2102
    /* Fix names if symlinked tables */
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2103
    if (append_file_to_dir(thd, &lex->create_info.data_file_name,
2104
			   create_table->table_name) ||
unknown's avatar
VIEW  
unknown committed
2105
	append_file_to_dir(thd, &lex->create_info.index_file_name,
2106
			   create_table->table_name))
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2107
      goto end_with_restore_list;
2108
#endif
2109
    /*
2110
      If we are using SET CHARSET without DEFAULT, add an implicit
2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121
      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;
    }
2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134
    /*
      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.
    */
2135 2136
    if (!thd->locked_tables &&
        !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
2137
    {
unknown's avatar
unknown committed
2138 2139
      res= 1;
      goto end_with_restore_list;
2140
    }
2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151
#ifdef WITH_PARTITION_STORAGE_ENGINE
    {
      partition_info *part_info= thd->lex->part_info;
      if (part_info && !(part_info= thd->lex->part_info->get_clone()))
      {
        res= -1;
        goto end_with_restore_list;
      }
      thd->work_part_info= part_info;
    }
#endif
2152
    if (select_lex->item_list.elements)		// With select
unknown's avatar
unknown committed
2153 2154
    {
      select_result *result;
2155

2156
      select_lex->options|= SELECT_NO_UNLOCK;
2157
      unit->set_limit(select_lex);
2158

unknown's avatar
unknown committed
2159 2160 2161 2162 2163 2164 2165
      if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE))
      {
        lex->link_first_table_back(create_table, link_to_local);
        create_table->create= TRUE;
      }

      if (!(res= open_and_lock_tables(thd, lex->query_tables)))
2166
      {
2167 2168 2169 2170
        /*
          Is table which we are changing used somewhere in other parts
          of query
        */
2171
        if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE))
2172
        {
2173
          TABLE_LIST *duplicate;
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2174
          create_table= lex->unlink_first_table(&link_to_local);
2175
          if ((duplicate= unique_table(thd, create_table, select_tables, 0)))
2176 2177 2178
          {
            update_non_unique_table_error(create_table, "CREATE", duplicate);
            res= 1;
2179
            goto end_with_restore_list;
2180
          }
2181
        }
unknown's avatar
unknown committed
2182 2183 2184 2185 2186 2187 2188 2189
        /* 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)
          {
2190
            TABLE_LIST *duplicate;
2191
            if ((duplicate= unique_table(thd, tab, select_tables, 0)))
unknown's avatar
unknown committed
2192
            {
2193
              update_non_unique_table_error(tab, "CREATE", duplicate);
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2194
              res= 1;
2195
              goto end_with_restore_list;
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unknown committed
2196 2197 2198
            }
          }
        }
2199

unknown's avatar
unknown committed
2200 2201 2202 2203 2204 2205
        /*
          FIXME Temporary hack which will go away once Kostja pushes
                his uber-fix for ALTER/CREATE TABLE.
        */
        lex->create_info.table_existed= 0;

unknown's avatar
VIEW  
unknown committed
2206 2207 2208 2209 2210
        if ((result= new select_create(create_table,
				       &lex->create_info,
				       lex->create_list,
				       lex->key_list,
				       select_lex->item_list,
2211 2212
				       lex->duplicates,
				       lex->ignore)))
2213 2214 2215 2216 2217
        {
          /*
            CREATE from SELECT give its SELECT_LEX for SELECT,
            and item_list belong to SELECT
          */
2218
          res= handle_select(thd, lex, result, 0);
2219
          delete result;
2220
        }
unknown's avatar
unknown committed
2221
	/* reset for PS */
2222 2223
	lex->create_list.empty();
	lex->key_list.empty();
2224
      }
unknown's avatar
unknown committed
2225 2226 2227
      else if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE))
        create_table= lex->unlink_first_table(&link_to_local);

2228
    }
unknown's avatar
unknown committed
2229
    else
unknown's avatar
unknown committed
2230
    {
2231 2232 2233
      /* So that CREATE TEMPORARY TABLE gets to binlog at commit/rollback */
      if (lex->create_info.options & HA_LEX_CREATE_TMP_TABLE)
        thd->options|= OPTION_KEEP_LOG;
unknown's avatar
unknown committed
2234
      /* regular create */
unknown's avatar
unknown committed
2235 2236 2237
      if (lex->create_info.options & HA_LEX_CREATE_TABLE_LIKE)
        res= mysql_create_like_table(thd, create_table, select_tables,
                                     &lex->create_info);
unknown's avatar
unknown committed
2238
      else
2239
      {
unknown's avatar
VIEW  
unknown committed
2240
        res= mysql_create_table(thd, create_table->db,
2241
				create_table->table_name, &lex->create_info,
unknown's avatar
VIEW  
unknown committed
2242
				lex->create_list,
2243
				lex->key_list, 0, 0, 1);
2244
      }
unknown's avatar
unknown committed
2245
      if (!res)
2246
	send_ok(thd);
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unknown committed
2247
    }
2248

unknown's avatar
unknown committed
2249
    /* put tables back for PS rexecuting */
unknown's avatar
unknown committed
2250
end_with_restore_list:
unknown's avatar
VIEW  
unknown committed
2251
    lex->link_first_table_back(create_table, link_to_local);
unknown's avatar
unknown committed
2252
    break;
unknown's avatar
unknown committed
2253
  }
unknown's avatar
unknown committed
2254
  case SQLCOM_CREATE_INDEX:
unknown's avatar
VIEW  
unknown committed
2255 2256
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_one_table_access(thd, INDEX_ACL, all_tables))
unknown's avatar
unknown committed
2257
      goto error; /* purecov: inspected */
2258
    thd->enable_slow_log= opt_log_slow_admin_statements;
2259
    if (end_active_trans(thd))
unknown's avatar
unknown committed
2260
      goto error;
2261
    res= mysql_create_index(thd, first_table, lex->key_list);
unknown's avatar
unknown committed
2262 2263
    break;

unknown's avatar
unknown committed
2264
#ifdef HAVE_REPLICATION
unknown's avatar
unknown committed
2265
  case SQLCOM_SLAVE_START:
2266
  {
2267
    pthread_mutex_lock(&LOCK_active_mi);
2268
    start_slave(thd,active_mi,1 /* net report*/);
2269
    pthread_mutex_unlock(&LOCK_active_mi);
unknown's avatar
unknown committed
2270
    break;
2271
  }
unknown's avatar
unknown committed
2272
  case SQLCOM_SLAVE_STOP:
2273 2274 2275 2276 2277 2278
  /*
    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,
2279
      so it waits for the client thread because t is locked by it.
2280
    - then the client thread does SLAVE STOP.
2281 2282
      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.
2283 2284 2285
    To prevent that, refuse SLAVE STOP if the
    client thread has locked tables
  */
2286
  if (thd->locked_tables || thd->active_transaction() || thd->global_read_lock)
2287
  {
2288 2289
    my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
               ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
2290
    goto error;
2291
  }
2292
  {
2293
    pthread_mutex_lock(&LOCK_active_mi);
2294
    stop_slave(thd,active_mi,1/* net report*/);
2295
    pthread_mutex_unlock(&LOCK_active_mi);
unknown's avatar
unknown committed
2296
    break;
2297
  }
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unknown committed
2298
#endif /* HAVE_REPLICATION */
2299

unknown's avatar
unknown committed
2300
  case SQLCOM_ALTER_TABLE:
unknown's avatar
VIEW  
unknown committed
2301
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
2302
    {
unknown's avatar
unknown committed
2303
      ulong priv=0;
unknown's avatar
unknown committed
2304
      ulong priv_needed= ALTER_ACL;
2305 2306 2307 2308 2309
      /*
        We also require DROP priv for ALTER TABLE ... DROP PARTITION, as well
        as for RENAME TO, as being done by SQLCOM_RENAME_TABLE
      */
      if (lex->alter_info.flags & (ALTER_DROP_PARTITION | ALTER_RENAME))
unknown's avatar
unknown committed
2310 2311
        priv_needed|= DROP_ACL;

unknown's avatar
unknown committed
2312 2313
      /* Must be set in the parser */
      DBUG_ASSERT(select_lex->db);
unknown's avatar
unknown committed
2314
      if (check_access(thd, priv_needed, first_table->db,
2315 2316 2317 2318
		       &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))||
unknown's avatar
VIEW  
unknown committed
2319
	  check_merge_table_access(thd, first_table->db,
2320 2321 2322
				   (TABLE_LIST *)
				   lex->create_info.merge_list.first))
	goto error;				/* purecov: inspected */
unknown's avatar
unknown committed
2323 2324
      if (grant_option)
      {
unknown's avatar
unknown committed
2325
	if (check_grant(thd, priv_needed, all_tables, 0, UINT_MAX, 0))
unknown's avatar
unknown committed
2326
	  goto error;
2327
	if (lex->name.str && !test_all_bits(priv,INSERT_ACL | CREATE_ACL))
unknown's avatar
unknown committed
2328 2329 2330
	{					// Rename of table
	  TABLE_LIST tmp_table;
	  bzero((char*) &tmp_table,sizeof(tmp_table));
2331
	  tmp_table.table_name= lex->name.str;
2332
	  tmp_table.db=select_lex->db;
unknown's avatar
unknown committed
2333
	  tmp_table.grant.privilege=priv;
unknown's avatar
unknown committed
2334 2335
	  if (check_grant(thd, INSERT_ACL | CREATE_ACL, &tmp_table, 0,
			  UINT_MAX, 0))
unknown's avatar
unknown committed
2336 2337 2338
	    goto error;
	}
      }
2339
      /* Don't yet allow changing of symlinks with ALTER TABLE */
2340 2341 2342 2343 2344 2345
      if (lex->create_info.data_file_name)
        push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
                     "DATA DIRECTORY option ignored");
      if (lex->create_info.index_file_name)
        push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
                     "INDEX DIRECTORY option ignored");
2346
      lex->create_info.data_file_name=lex->create_info.index_file_name=0;
unknown's avatar
unknown committed
2347
      /* ALTER TABLE ends previous transaction */
2348
      if (end_active_trans(thd))
unknown's avatar
unknown committed
2349
	goto error;
2350

2351 2352 2353 2354 2355
      if (!thd->locked_tables &&
          !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
      {
        res= 1;
        break;
unknown's avatar
unknown committed
2356
      }
2357

2358
      thd->enable_slow_log= opt_log_slow_admin_statements;
2359
      res= mysql_alter_table(thd, select_lex->db, lex->name.str,
2360 2361 2362 2363 2364
                             &lex->create_info,
                             first_table, lex->create_list,
                             lex->key_list,
                             select_lex->order_list.elements,
                             (ORDER *) select_lex->order_list.first,
2365
                             lex->ignore, &lex->alter_info, 1);
unknown's avatar
unknown committed
2366 2367
      break;
    }
unknown's avatar
unknown committed
2368
  case SQLCOM_RENAME_TABLE:
unknown's avatar
unknown committed
2369
  {
unknown's avatar
VIEW  
unknown committed
2370
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
2371
    TABLE_LIST *table;
unknown's avatar
VIEW  
unknown committed
2372
    for (table= first_table; table; table= table->next_local->next_local)
unknown's avatar
unknown committed
2373
    {
unknown's avatar
unknown committed
2374
      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
2375
		       &table->grant.privilege,0,0, test(table->schema_table)) ||
unknown's avatar
VIEW  
unknown committed
2376
	  check_access(thd, INSERT_ACL | CREATE_ACL, table->next_local->db,
2377 2378
		       &table->next_local->grant.privilege, 0, 0,
                       test(table->next_local->schema_table)))
unknown's avatar
unknown committed
2379 2380 2381
	goto error;
      if (grant_option)
      {
unknown's avatar
VIEW  
unknown committed
2382
	TABLE_LIST old_list, new_list;
unknown's avatar
unknown committed
2383 2384 2385 2386
	/*
	  we do not need initialize old_list and new_list because we will
	  come table[0] and table->next[0] there
	*/
unknown's avatar
VIEW  
unknown committed
2387 2388
	old_list= table[0];
	new_list= table->next_local[0];
2389
	if (check_grant(thd, ALTER_ACL | DROP_ACL, &old_list, 0, 1, 0) ||
unknown's avatar
VIEW  
unknown committed
2390
	    (!test_all_bits(table->next_local->grant.privilege,
2391
			    INSERT_ACL | CREATE_ACL) &&
unknown's avatar
VIEW  
unknown committed
2392
	     check_grant(thd, INSERT_ACL | CREATE_ACL, &new_list, 0, 1, 0)))
unknown's avatar
unknown committed
2393 2394 2395
	  goto error;
      }
    }
unknown's avatar
VIEW  
unknown committed
2396
    query_cache_invalidate3(thd, first_table, 0);
unknown's avatar
unknown committed
2397
    if (end_active_trans(thd) || mysql_rename_tables(thd, first_table, 0))
unknown's avatar
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2398
      goto error;
unknown's avatar
unknown committed
2399
    break;
unknown's avatar
unknown committed
2400
  }
2401
#ifndef EMBEDDED_LIBRARY
unknown's avatar
unknown committed
2402 2403
  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
unknown's avatar
unknown committed
2404 2405
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
2406
    goto error;
unknown's avatar
unknown committed
2407 2408
#else
    {
unknown's avatar
unknown committed
2409
      if (check_global_access(thd, SUPER_ACL))
unknown's avatar
unknown committed
2410 2411 2412 2413
	goto error;
      res = show_binlogs(thd);
      break;
    }
unknown's avatar
unknown committed
2414
#endif
2415
#endif /* EMBEDDED_LIBRARY */
unknown's avatar
unknown committed
2416
  case SQLCOM_SHOW_CREATE:
unknown's avatar
VIEW  
unknown committed
2417
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
2418
#ifdef DONT_ALLOW_SHOW_COMMANDS
unknown's avatar
unknown committed
2419 2420
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
2421
    goto error;
unknown's avatar
unknown committed
2422
#else
unknown's avatar
unknown committed
2423
    {
2424 2425 2426
      /* Ignore temporary tables if this is "SHOW CREATE VIEW" */
      if (lex->only_view)
        first_table->skip_temporary= 1;
unknown's avatar
unknown committed
2427
      if (check_show_create_table_access(thd, first_table))
2428
	goto error;
unknown's avatar
unknown committed
2429
      res= mysqld_show_create(thd, first_table);
unknown's avatar
unknown committed
2430 2431
      break;
    }
unknown's avatar
unknown committed
2432
#endif
2433 2434
  case SQLCOM_CHECKSUM:
  {
unknown's avatar
VIEW  
unknown committed
2435
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
2436
    if (check_table_access(thd, SELECT_ACL | EXTRA_ACL, all_tables, 0))
2437
      goto error; /* purecov: inspected */
unknown's avatar
VIEW  
unknown committed
2438
    res = mysql_checksum_table(thd, first_table, &lex->check_opt);
2439 2440
    break;
  }
unknown's avatar
unknown committed
2441
  case SQLCOM_REPAIR:
2442
  {
unknown's avatar
VIEW  
unknown committed
2443
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
2444
    if (check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
2445
      goto error; /* purecov: inspected */
2446
    thd->enable_slow_log= opt_log_slow_admin_statements;
unknown's avatar
VIEW  
unknown committed
2447
    res= mysql_repair_table(thd, first_table, &lex->check_opt);
2448 2449 2450
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
2451 2452 2453
      /*
        Presumably, REPAIR and binlog writing doesn't require synchronization
      */
2454 2455
      if (mysql_bin_log.is_open())
      {
unknown's avatar
unknown committed
2456
	thd->clear_error(); // No binlog error generated
unknown's avatar
unknown committed
2457 2458
        thd->binlog_query(THD::STMT_QUERY_TYPE,
                          thd->query, thd->query_length, 0, FALSE);
2459 2460
      }
    }
2461
    select_lex->table_list.first= (byte*) first_table;
2462
    lex->query_tables=all_tables;
2463 2464
    break;
  }
unknown's avatar
unknown committed
2465
  case SQLCOM_CHECK:
2466
  {
unknown's avatar
VIEW  
unknown committed
2467
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
2468
    if (check_table_access(thd, SELECT_ACL | EXTRA_ACL , all_tables, 0))
2469
      goto error; /* purecov: inspected */
2470
    thd->enable_slow_log= opt_log_slow_admin_statements;
unknown's avatar
VIEW  
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2471
    res = mysql_check_table(thd, first_table, &lex->check_opt);
2472
    select_lex->table_list.first= (byte*) first_table;
2473
    lex->query_tables=all_tables;
2474 2475
    break;
  }
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2476 2477
  case SQLCOM_ANALYZE:
  {
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VIEW  
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2478
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
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2479
    if (check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
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2480
      goto error; /* purecov: inspected */
2481
    thd->enable_slow_log= opt_log_slow_admin_statements;
2482
    res= mysql_analyze_table(thd, first_table, &lex->check_opt);
2483 2484 2485
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
2486 2487 2488
      /*
        Presumably, ANALYZE and binlog writing doesn't require synchronization
      */
2489 2490
      if (mysql_bin_log.is_open())
      {
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2491
	thd->clear_error(); // No binlog error generated
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2492 2493
        thd->binlog_query(THD::STMT_QUERY_TYPE,
                          thd->query, thd->query_length, 0, FALSE);
2494 2495
      }
    }
2496
    select_lex->table_list.first= (byte*) first_table;
2497
    lex->query_tables=all_tables;
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2498
    break;
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2499
  }
2500

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2501 2502
  case SQLCOM_OPTIMIZE:
  {
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VIEW  
unknown committed
2503
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
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2504
    if (check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
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2505
      goto error; /* purecov: inspected */
2506
    thd->enable_slow_log= opt_log_slow_admin_statements;
2507
    res= (specialflag & (SPECIAL_SAFE_MODE | SPECIAL_NO_NEW_FUNC)) ?
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VIEW  
unknown committed
2508 2509
      mysql_recreate_table(thd, first_table, 1) :
      mysql_optimize_table(thd, first_table, &lex->check_opt);
2510 2511 2512
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
2513 2514 2515
      /*
        Presumably, OPTIMIZE and binlog writing doesn't require synchronization
      */
2516 2517
      if (mysql_bin_log.is_open())
      {
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2518
	thd->clear_error(); // No binlog error generated
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2519 2520
        thd->binlog_query(THD::STMT_QUERY_TYPE,
                          thd->query, thd->query_length, 0, FALSE);
2521 2522
      }
    }
2523
    select_lex->table_list.first= (byte*) first_table;
2524
    lex->query_tables=all_tables;
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2525 2526 2527
    break;
  }
  case SQLCOM_UPDATE:
unknown's avatar
VIEW  
unknown committed
2528 2529
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (update_precheck(thd, all_tables))
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2530
      break;
2531 2532
    DBUG_ASSERT(select_lex->offset_limit == 0);
    unit->set_limit(select_lex);
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2533 2534 2535 2536 2537 2538 2539 2540
    res= (up_result= mysql_update(thd, all_tables,
                                  select_lex->item_list,
                                  lex->value_list,
                                  select_lex->where,
                                  select_lex->order_list.elements,
                                  (ORDER *) select_lex->order_list.first,
                                  unit->select_limit_cnt,
                                  lex->duplicates, lex->ignore));
2541
    /* mysql_update return 2 if we need to switch to multi-update */
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2542
    if (up_result != 2)
2543
      break;
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2544
    /* Fall through */
2545
  case SQLCOM_UPDATE_MULTI:
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2546 2547 2548
  {
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    /* if we switched from normal update, rights are checked */
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2549
    if (up_result != 2)
2550
    {
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2551 2552 2553 2554 2555
      if ((res= multi_update_precheck(thd, all_tables)))
        break;
    }
    else
      res= 0;
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2556

2557
    res= mysql_multi_update_prepare(thd);
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2558

2559
#ifdef HAVE_REPLICATION
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2560
    /* Check slave filtering rules */
2561
    if (unlikely(thd->slave_thread))
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2562
    {
2563 2564
      if (all_tables_not_ok(thd, all_tables))
      {
2565 2566 2567 2568 2569
        if (res!= 0)
        {
          res= 0;             /* don't care of prev failure  */
          thd->clear_error(); /* filters are of highest prior */
        }
2570 2571 2572 2573
        /* we warn the slave SQL thread */
        my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
        break;
      }
2574 2575
      if (res)
        break;
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2576
    }
2577 2578
    else
    {
2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591
#endif /* HAVE_REPLICATION */
      if (res)
        break;
      if (opt_readonly &&
	  !(thd->security_ctx->master_access & SUPER_ACL) &&
	  some_non_temp_table_to_be_updated(thd, all_tables))
      {
	my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
	break;
      }
#ifdef HAVE_REPLICATION
    }  /* unlikely */
#endif
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2592

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2593 2594 2595 2596 2597 2598
    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);
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2599
    break;
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2600
  }
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2601
  case SQLCOM_REPLACE:
2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631
#ifndef DBUG_OFF
    if (mysql_bin_log.is_open())
    {
      /*
        Generate an incident log event before writing the real event
        to the binary log.  We put this event is before the statement
        since that makes it simpler to check that the statement was
        not executed on the slave (since incidents usually stop the
        slave).

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

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

      Incident incident= INCIDENT_NONE;
      DBUG_PRINT("debug", ("Just before generate_incident()"));
      DBUG_EXECUTE_IF("incident_database_resync_on_replace",
                      incident= INCIDENT_LOST_EVENTS;);
      if (incident)
      {
        Incident_log_event ev(thd, incident);
        mysql_bin_log.write(&ev);
        mysql_bin_log.rotate_and_purge(RP_FORCE_ROTATE);
      }
      DBUG_PRINT("debug", ("Just after generate_incident()"));
    }
#endif
2632 2633
  case SQLCOM_INSERT:
  {
unknown's avatar
VIEW  
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2634
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
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2635
    if ((res= insert_precheck(thd, all_tables)))
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2636
      break;
2637 2638 2639 2640 2641 2642 2643 2644

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

unknown's avatar
VIEW  
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2645
    res= mysql_insert(thd, all_tables, lex->field_list, lex->many_values,
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2646
		      lex->update_list, lex->value_list,
2647
                      lex->duplicates, lex->ignore);
2648 2649 2650 2651 2652 2653 2654

    /*
      If we have inserted into a VIEW, and the base table has
      AUTO_INCREMENT column, but this column is not accessible through
      a view, then we should restore LAST_INSERT_ID to the value it
      had before the statement.
    */
unknown's avatar
VIEW  
unknown committed
2655
    if (first_table->view && !first_table->contain_auto_increment)
2656 2657
      thd->first_successful_insert_id_in_cur_stmt=
        thd->first_successful_insert_id_in_prev_stmt;
2658

unknown's avatar
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2659
    break;
2660
  }
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2661 2662 2663
  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
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2664
    select_result *sel_result;
unknown's avatar
VIEW  
unknown committed
2665
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
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2666
    if ((res= insert_precheck(thd, all_tables)))
2667
      break;
unknown's avatar
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2668

2669
    /* Fix lock for first table */
unknown's avatar
VIEW  
unknown committed
2670 2671
    if (first_table->lock_type == TL_WRITE_DELAYED)
      first_table->lock_type= TL_WRITE;
2672

2673 2674
    /* Don't unlock tables until command is written to binary log */
    select_lex->options|= SELECT_NO_UNLOCK;
unknown's avatar
unknown committed
2675

2676
    unit->set_limit(select_lex);
2677 2678 2679 2680 2681 2682 2683 2684

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

unknown's avatar
VIEW  
unknown committed
2685
    if (!(res= open_and_lock_tables(thd, all_tables)))
2686
    {
2687
      /* Skip first table, which is the table we are inserting in */
unknown's avatar
unknown committed
2688 2689
      TABLE_LIST *second_table= first_table->next_local;
      select_lex->table_list.first= (byte*) second_table;
2690 2691
      select_lex->context.table_list= 
        select_lex->context.first_name_resolution_table= second_table;
2692
      res= mysql_insert_select_prepare(thd);
unknown's avatar
unknown committed
2693 2694 2695 2696 2697 2698 2699
      if (!res && (sel_result= new select_insert(first_table,
                                                 first_table->table,
                                                 &lex->field_list,
                                                 &lex->update_list,
                                                 &lex->value_list,
                                                 lex->duplicates,
                                                 lex->ignore)))
2700
      {
unknown's avatar
unknown committed
2701
	res= handle_select(thd, lex, sel_result, OPTION_SETUP_TABLES_DONE);
2702 2703 2704 2705 2706 2707 2708 2709 2710
        /*
          Invalidate the table in the query cache if something changed
          after unlocking when changes become visible.
          TODO: this is workaround. right way will be move invalidating in
          the unlock procedure.
        */
        if (first_table->lock_type ==  TL_WRITE_CONCURRENT_INSERT &&
            thd->lock)
        {
2711 2712 2713
          /* INSERT ... SELECT should invalidate only the very first table */
          TABLE_LIST *save_table= first_table->next_local;
          first_table->next_local= 0;
2714 2715
          mysql_unlock_tables(thd, thd->lock);
          query_cache_invalidate3(thd, first_table, 1);
2716
          first_table->next_local= save_table;
2717 2718
          thd->lock=0;
        }
unknown's avatar
unknown committed
2719
        delete sel_result;
2720
      }
2721
      /* revert changes for SP */
unknown's avatar
unknown committed
2722
      select_lex->table_list.first= (byte*) first_table;
2723
    }
unknown's avatar
VIEW  
unknown committed
2724

2725 2726 2727 2728 2729 2730
    /*
      If we have inserted into a VIEW, and the base table has
      AUTO_INCREMENT column, but this column is not accessible through
      a view, then we should restore LAST_INSERT_ID to the value it
      had before the statement.
    */
unknown's avatar
VIEW  
unknown committed
2731
    if (first_table->view && !first_table->contain_auto_increment)
2732 2733
      thd->first_successful_insert_id_in_cur_stmt=
        thd->first_successful_insert_id_in_prev_stmt;
2734

unknown's avatar
unknown committed
2735 2736
    break;
  }
2737
  case SQLCOM_TRUNCATE:
2738 2739 2740 2741 2742
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
unknown's avatar
VIEW  
unknown committed
2743
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
2744
    if (check_one_table_access(thd, DROP_ACL, all_tables))
unknown's avatar
unknown committed
2745
      goto error;
2746 2747 2748 2749
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
2750
    if (thd->locked_tables || thd->active_transaction())
2751
    {
unknown's avatar
unknown committed
2752 2753
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
2754 2755
      goto error;
    }
unknown's avatar
VIEW  
unknown committed
2756

unknown's avatar
unknown committed
2757
    res= mysql_truncate(thd, first_table, 0);
2758
    break;
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unknown committed
2759
  case SQLCOM_DELETE:
unknown's avatar
unknown committed
2760
  {
unknown's avatar
VIEW  
unknown committed
2761 2762
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if ((res= delete_precheck(thd, all_tables)))
unknown's avatar
unknown committed
2763
      break;
2764 2765
    DBUG_ASSERT(select_lex->offset_limit == 0);
    unit->set_limit(select_lex);
2766 2767 2768 2769 2770 2771 2772 2773

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

unknown's avatar
VIEW  
unknown committed
2774
    res = mysql_delete(thd, all_tables, select_lex->where,
2775
                       &select_lex->order_list,
unknown's avatar
unknown committed
2776 2777
                       unit->select_limit_cnt, select_lex->options,
                       FALSE);
unknown's avatar
unknown committed
2778 2779
    break;
  }
2780
  case SQLCOM_DELETE_MULTI:
unknown's avatar
unknown committed
2781
  {
unknown's avatar
VIEW  
unknown committed
2782
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2783
    TABLE_LIST *aux_tables=
unknown's avatar
unknown committed
2784
      (TABLE_LIST *)thd->lex->auxiliary_table_list.first;
unknown's avatar
unknown committed
2785
    multi_delete *del_result;
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unknown committed
2786

2787 2788 2789 2790 2791 2792 2793
    if (!thd->locked_tables &&
        !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
    {
      res= 1;
      break;
    }

2794
    if ((res= multi_delete_precheck(thd, all_tables)))
2795
      break;
unknown's avatar
unknown committed
2796

unknown's avatar
unknown committed
2797
    /* condition will be TRUE on SP re-excuting */
2798 2799
    if (select_lex->item_list.elements != 0)
      select_lex->item_list.empty();
unknown's avatar
unknown committed
2800
    if (add_item_to_list(thd, new Item_null()))
unknown's avatar
unknown committed
2801
      goto error;
2802

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unknown committed
2803
    thd->proc_info="init";
unknown's avatar
VIEW  
unknown committed
2804 2805 2806 2807
    if ((res= open_and_lock_tables(thd, all_tables)))
      break;

    if ((res= mysql_multi_delete_prepare(thd)))
unknown's avatar
unknown committed
2808
      goto error;
2809

unknown's avatar
unknown committed
2810 2811
    if (!thd->is_fatal_error &&
        (del_result= new multi_delete(aux_tables, lex->table_count)))
unknown's avatar
unknown committed
2812
    {
2813 2814 2815
      res= mysql_select(thd, &select_lex->ref_pointer_array,
			select_lex->get_table_list(),
			select_lex->with_wild,
2816
			select_lex->item_list,
unknown's avatar
unknown committed
2817
			select_lex->where,
2818
			0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
unknown's avatar
unknown committed
2819 2820
			(ORDER *)NULL,
			select_lex->options | thd->options |
2821 2822
			SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK |
                        OPTION_SETUP_TABLES_DONE,
unknown's avatar
unknown committed
2823 2824
			del_result, unit, select_lex);
      delete del_result;
unknown's avatar
unknown committed
2825 2826
    }
    else
2827
      res= TRUE;                                // Error
unknown's avatar
unknown committed
2828 2829
    break;
  }
unknown's avatar
unknown committed
2830
  case SQLCOM_DROP_TABLE:
unknown's avatar
unknown committed
2831
  {
unknown's avatar
VIEW  
unknown committed
2832
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2833 2834
    if (!lex->drop_temporary)
    {
unknown's avatar
VIEW  
unknown committed
2835
      if (check_table_access(thd, DROP_ACL, all_tables, 0))
2836 2837
	goto error;				/* purecov: inspected */
      if (end_active_trans(thd))
unknown's avatar
unknown committed
2838
        goto error;
2839
    }
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unknown committed
2840
    else
unknown's avatar
unknown committed
2841 2842 2843 2844 2845 2846
    {
      /*
	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.
unknown's avatar
unknown committed
2847 2848
	To not generate such irrelevant "table does not exist errors",
	we silently add IF EXISTS if TEMPORARY was used.
unknown's avatar
unknown committed
2849 2850
      */
      if (thd->slave_thread)
2851
        lex->drop_if_exists= 1;
2852

unknown's avatar
unknown committed
2853
      /* So that DROP TEMPORARY TABLE gets to binlog at commit/rollback */
2854
      thd->options|= OPTION_KEEP_LOG;
unknown's avatar
unknown committed
2855
    }
2856
    /* DDL and binlog write order protected by LOCK_open */
unknown's avatar
VIEW  
unknown committed
2857 2858
    res= mysql_rm_table(thd, first_table, lex->drop_if_exists,
			lex->drop_temporary);
unknown's avatar
unknown committed
2859 2860
  }
  break;
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unknown committed
2861
  case SQLCOM_DROP_INDEX:
unknown's avatar
VIEW  
unknown committed
2862 2863
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_one_table_access(thd, INDEX_ACL, all_tables))
unknown's avatar
unknown committed
2864
      goto error;				/* purecov: inspected */
2865
    if (end_active_trans(thd))
unknown's avatar
unknown committed
2866
      goto error;
2867
    res= mysql_drop_index(thd, first_table, &lex->alter_info);
unknown's avatar
unknown committed
2868 2869
    break;
  case SQLCOM_SHOW_PROCESSLIST:
2870 2871
    if (!thd->security_ctx->priv_user[0] &&
        check_global_access(thd,PROCESS_ACL))
unknown's avatar
unknown committed
2872
      break;
unknown's avatar
unknown committed
2873
    mysqld_list_processes(thd,
2874 2875 2876 2877
			  (thd->security_ctx->master_access & PROCESS_ACL ?
                           NullS :
                           thd->security_ctx->priv_user),
                          lex->verbose);
unknown's avatar
unknown committed
2878
    break;
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unknown committed
2879 2880
  case SQLCOM_SHOW_STORAGE_ENGINES:
    res= mysqld_show_storage_engines(thd);
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2881
    break;
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2882 2883 2884
  case SQLCOM_SHOW_AUTHORS:
    res= mysqld_show_authors(thd);
    break;
2885 2886 2887
  case SQLCOM_SHOW_CONTRIBUTORS:
    res= mysqld_show_contributors(thd);
    break;
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unknown committed
2888 2889 2890 2891 2892 2893
  case SQLCOM_SHOW_PRIVILEGES:
    res= mysqld_show_privileges(thd);
    break;
  case SQLCOM_SHOW_COLUMN_TYPES:
    res= mysqld_show_column_types(thd);
    break;
unknown's avatar
unknown committed
2894
  case SQLCOM_SHOW_ENGINE_LOGS:
unknown's avatar
unknown committed
2895
#ifdef DONT_ALLOW_SHOW_COMMANDS
unknown's avatar
unknown committed
2896 2897
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0));	/* purecov: inspected */
2898
    goto error;
unknown's avatar
unknown committed
2899 2900
#else
    {
2901
      if (grant_option && check_access(thd, FILE_ACL, any_db,0,0,0,0))
unknown's avatar
unknown committed
2902
	goto error;
unknown's avatar
unknown committed
2903
      res= ha_show_status(thd, lex->create_info.db_type, HA_ENGINE_LOGS);
unknown's avatar
unknown committed
2904 2905
      break;
    }
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unknown committed
2906 2907
#endif
  case SQLCOM_CHANGE_DB:
2908 2909 2910 2911
  {
    LEX_STRING db_str= { (char *) select_lex->db, strlen(select_lex->db) };

    if (!mysql_change_db(thd, &db_str, FALSE))
2912
      send_ok(thd);
2913

unknown's avatar
unknown committed
2914
    break;
2915
  }
2916

unknown's avatar
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2917 2918
  case SQLCOM_LOAD:
  {
unknown's avatar
VIEW  
unknown committed
2919
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
2920
    uint privilege= (lex->duplicates == DUP_REPLACE ?
unknown's avatar
unknown committed
2921 2922
		     INSERT_ACL | DELETE_ACL : INSERT_ACL) |
                    (lex->local_file ? 0 : FILE_ACL);
2923

unknown's avatar
unknown committed
2924
    if (lex->local_file)
unknown's avatar
unknown committed
2925
    {
2926
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
2927
          !opt_local_infile)
2928
      {
unknown's avatar
unknown committed
2929
	my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND), MYF(0));
2930 2931
	goto error;
      }
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unknown committed
2932
    }
unknown's avatar
unknown committed
2933 2934 2935 2936

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

unknown's avatar
VIEW  
unknown committed
2937
    res= mysql_load(thd, lex->exchange, first_table, lex->field_list,
unknown's avatar
unknown committed
2938
                    lex->update_list, lex->value_list, lex->duplicates,
2939
                    lex->ignore, (bool) lex->local_file);
unknown's avatar
unknown committed
2940 2941
    break;
  }
2942

unknown's avatar
unknown committed
2943
  case SQLCOM_SET_OPTION:
2944 2945
  {
    List<set_var_base> *lex_var_list= &lex->var_list;
2946
    if ((check_table_access(thd, SELECT_ACL, all_tables, 0) ||
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2947 2948
	 open_and_lock_tables(thd, all_tables)))
      goto error;
2949 2950
    if (lex->one_shot_set && not_all_support_one_shot(lex_var_list))
    {
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2951 2952
      my_error(ER_RESERVED_SYNTAX, MYF(0), "SET ONE_SHOT");
      goto error;
2953 2954 2955 2956 2957 2958 2959 2960
    }
    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;
2961
      send_ok(thd);
2962
    }
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2963
    break;
2964
  }
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2965

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2966
  case SQLCOM_UNLOCK_TABLES:
2967 2968 2969 2970 2971 2972
    /*
      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.
    */
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2973
    unlock_locked_tables(thd);
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2974 2975
    if (thd->options & OPTION_TABLE_LOCK)
    {
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2976
      end_active_trans(thd);
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2977
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
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2978 2979
    }
    if (thd->global_read_lock)
2980
      unlock_global_read_lock(thd);
2981
    send_ok(thd);
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2982 2983
    break;
  case SQLCOM_LOCK_TABLES:
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2984
    unlock_locked_tables(thd);
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2985
    if (end_active_trans(thd))
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2986
      goto error;
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VIEW  
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2987
    if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, all_tables, 0))
2988
      goto error;
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2989
    thd->in_lock_tables=1;
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2990
    thd->options|= OPTION_TABLE_LOCK;
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VIEW  
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2991

2992
    if (!(res= simple_open_n_lock_tables(thd, all_tables)))
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2993
    {
2994 2995
#ifdef HAVE_QUERY_CACHE
      if (thd->variables.query_cache_wlock_invalidate)
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VIEW  
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2996
	query_cache.invalidate_locked_for_write(first_table);
2997
#endif /*HAVE_QUERY_CACHE*/
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2998 2999
      thd->locked_tables=thd->lock;
      thd->lock=0;
3000
      send_ok(thd);
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3001
    }
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3002 3003
    else
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
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3004 3005 3006
    thd->in_lock_tables=0;
    break;
  case SQLCOM_CREATE_DB:
3007
  {
3008 3009 3010 3011 3012
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
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3013
    char *alias;
3014 3015
    if (!(alias=thd->strmake(lex->name.str, lex->name.length)) ||
        check_db_name(&lex->name))
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3016
    {
3017
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name.str);
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3018 3019
      break;
    }
3020 3021 3022
    /*
      If in a slave thread :
      CREATE DATABASE DB was certainly not preceded by USE DB.
3023
      For that reason, db_ok() in sql/slave.cc did not check the
3024 3025 3026
      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.
    */
3027
#ifdef HAVE_REPLICATION
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3028
    if (thd->slave_thread && 
3029 3030
	(!rpl_filter->db_ok(lex->name.str) ||
	 !rpl_filter->db_ok_with_wild_table(lex->name.str)))
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3031
    {
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3032
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
3033
      break;
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3034
    }
3035
#endif
3036 3037
    if (check_access(thd,CREATE_ACL,lex->name.str, 0, 1, 0,
                     is_schema_db(lex->name.str)))
3038
      break;
3039 3040
    res= mysql_create_db(thd,(lower_case_table_names == 2 ? alias :
                              lex->name.str), &lex->create_info, 0);
3041 3042
    break;
  }
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3043
  case SQLCOM_DROP_DB:
3044
  {
3045 3046 3047 3048 3049
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
3050
    if (check_db_name(&lex->name))
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3051
    {
3052
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name.str);
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3053 3054
      break;
    }
3055 3056 3057 3058 3059 3060 3061
    /*
      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.
    */
3062
#ifdef HAVE_REPLICATION
3063
    if (thd->slave_thread && 
3064 3065
	(!rpl_filter->db_ok(lex->name.str) ||
	 !rpl_filter->db_ok_with_wild_table(lex->name.str)))
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3066
    {
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3067
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
3068
      break;
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3069
    }
3070
#endif
3071 3072
    if (check_access(thd,DROP_ACL,lex->name.str,0,1,0,
                     is_schema_db(lex->name.str)))
3073
      break;
3074 3075
    if (thd->locked_tables || thd->active_transaction())
    {
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unknown committed
3076 3077
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3078 3079
      goto error;
    }
3080
    res= mysql_rm_db(thd, lex->name.str, lex->drop_if_exists, 0);
3081 3082
    break;
  }
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3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105
  case SQLCOM_RENAME_DB:
  {
    LEX_STRING *olddb, *newdb;
    List_iterator <LEX_STRING> db_list(lex->db_list);
    olddb= db_list++;
    newdb= db_list++;
    if (end_active_trans(thd))
    {
      res= 1;
      break;
    }
#ifdef HAVE_REPLICATION
    if (thd->slave_thread && 
       (!rpl_filter->db_ok(olddb->str) ||
        !rpl_filter->db_ok(newdb->str) ||
        !rpl_filter->db_ok_with_wild_table(olddb->str) ||
        !rpl_filter->db_ok_with_wild_table(newdb->str)))
    {
      res= 1;
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
      break;
    }
#endif
3106 3107 3108 3109 3110
    if (check_db_name(newdb))
    {
      my_error(ER_WRONG_DB_NAME, MYF(0), newdb->str);
      break;
    }
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3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129
    if (check_access(thd,ALTER_ACL,olddb->str,0,1,0,is_schema_db(olddb->str)) ||
        check_access(thd,DROP_ACL,olddb->str,0,1,0,is_schema_db(olddb->str)) ||
        check_access(thd,CREATE_ACL,newdb->str,0,1,0,is_schema_db(newdb->str)))
    {
      res= 1;
      break;
    }
    if (thd->locked_tables || thd->active_transaction())
    {
      res= 1;
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
      goto error;
    }
    res= mysql_rename_db(thd, olddb, newdb);
    if (!res)
      send_ok(thd);
    break;
  }
3130 3131
  case SQLCOM_ALTER_DB:
  {
3132 3133
    LEX_STRING *db= &lex->name;
    if (check_db_name(db))
3134
    {
3135
      my_error(ER_WRONG_DB_NAME, MYF(0), db->str);
3136 3137
      break;
    }
unknown's avatar
unknown committed
3138 3139 3140
    /*
      If in a slave thread :
      ALTER DATABASE DB may not be preceded by USE DB.
3141
      For that reason, maybe db_ok() in sql/slave.cc did not check the
unknown's avatar
unknown committed
3142 3143 3144 3145
      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
3146
    if (thd->slave_thread &&
3147 3148
	(!rpl_filter->db_ok(db->str) ||
	 !rpl_filter->db_ok_with_wild_table(db->str)))
unknown's avatar
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3149
    {
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3150
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
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3151 3152 3153
      break;
    }
#endif
3154
    if (check_access(thd, ALTER_ACL, db->str, 0, 1, 0, is_schema_db(db->str)))
3155 3156 3157
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
unknown's avatar
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3158 3159
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3160 3161
      goto error;
    }
3162
    res= mysql_alter_db(thd, db->str, &lex->create_info);
3163 3164
    break;
  }
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3165 3166
  case SQLCOM_SHOW_CREATE_DB:
  {
3167
    if (check_db_name(&lex->name))
unknown's avatar
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3168
    {
3169
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name.str);
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3170 3171
      break;
    }
3172
    res= mysqld_show_create_db(thd, lex->name.str, &lex->create_info);
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3173 3174
    break;
  }
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3175 3176
  case SQLCOM_CREATE_EVENT:
  case SQLCOM_ALTER_EVENT:
3177
  do
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3178
  {
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3179
    DBUG_ASSERT(lex->event_parse_data);
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unknown committed
3180 3181 3182 3183 3184 3185
    if (lex->table_or_sp_used())
    {
      my_error(ER_NOT_SUPPORTED_YET, MYF(0), "Usage of subqueries or stored "
               "function calls as part of this statement");
      break;
    }
3186 3187 3188 3189 3190

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

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unknown committed
3191 3192
    switch (lex->sql_command) {
    case SQLCOM_CREATE_EVENT:
3193 3194 3195 3196
    {
      bool if_not_exists= (lex->create_info.options &
                           HA_LEX_CREATE_IF_NOT_EXISTS);
      res= Events::create_event(thd, lex->event_parse_data, if_not_exists);
unknown's avatar
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3197
      break;
3198
    }
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3199
    case SQLCOM_ALTER_EVENT:
3200 3201 3202
      res= Events::update_event(thd, lex->event_parse_data,
                                lex->spname ? &lex->spname->m_db : NULL,
                                lex->spname ? &lex->spname->m_name : NULL);
unknown's avatar
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3203
      break;
3204 3205
    default:
      DBUG_ASSERT(0);
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3206
    }
3207
    DBUG_PRINT("info",("DDL error code=%d", res));
unknown's avatar
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3208
    if (!res)
3209
      send_ok(thd);
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3210

3211 3212 3213 3214 3215 3216
  } while (0);
  /* Don't do it, if we are inside a SP */
  if (!thd->spcont)
  {
    delete lex->sphead;
    lex->sphead= NULL;
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3217
  }
3218 3219
  /* lex->unit.cleanup() is called outside, no need to call it here */
  break;
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3220
  case SQLCOM_SHOW_CREATE_EVENT:
3221 3222 3223 3224 3225 3226 3227 3228
    res= Events::show_create_event(thd, lex->spname->m_db,
                                   lex->spname->m_name);
    break;
  case SQLCOM_DROP_EVENT:
    if (!(res= Events::drop_event(thd,
                                  lex->spname->m_db, lex->spname->m_name,
                                  lex->drop_if_exists)))
      send_ok(thd);
3229
    break;
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3230
  case SQLCOM_CREATE_FUNCTION:                  // UDF function
unknown's avatar
unknown committed
3231
  {
3232
    if (check_access(thd,INSERT_ACL,"mysql",0,1,0,0))
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3233
      break;
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3234
#ifdef HAVE_DLOPEN
3235 3236
    if (sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname,
                        &thd->sp_func_cache, FALSE))
unknown's avatar
unknown committed
3237
    {
3238
      my_error(ER_UDF_EXISTS, MYF(0), lex->spname->m_name.str);
unknown's avatar
unknown committed
3239 3240
      goto error;
    }
3241
    if (!(res = mysql_create_function(thd, &lex->udf)))
unknown's avatar
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3242
      send_ok(thd);
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3243
#else
unknown's avatar
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3244
    my_error(ER_CANT_OPEN_LIBRARY, MYF(0), lex->udf.dl, 0, "feature disabled");
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3245
    res= TRUE;
unknown's avatar
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3246 3247
#endif
    break;
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3248
  }
unknown's avatar
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3249
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3250 3251
  case SQLCOM_CREATE_USER:
  {
3252
    if (check_access(thd, INSERT_ACL, "mysql", 0, 1, 1, 0) &&
3253
        check_global_access(thd,CREATE_USER_ACL))
3254
      break;
3255 3256
    if (end_active_trans(thd))
      goto error;
3257
    /* Conditionally writes to binlog */
3258 3259 3260 3261
    if (!(res= mysql_create_user(thd, lex->users_list)))
      send_ok(thd);
    break;
  }
3262 3263
  case SQLCOM_DROP_USER:
  {
3264
    if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 1, 0) &&
3265
        check_global_access(thd,CREATE_USER_ACL))
3266
      break;
3267 3268
    if (end_active_trans(thd))
      goto error;
3269
    /* Conditionally writes to binlog */
3270
    if (!(res= mysql_drop_user(thd, lex->users_list)))
3271 3272 3273 3274 3275
      send_ok(thd);
    break;
  }
  case SQLCOM_RENAME_USER:
  {
3276
    if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1, 0) &&
3277
        check_global_access(thd,CREATE_USER_ACL))
3278
      break;
3279 3280
    if (end_active_trans(thd))
      goto error;
3281
    /* Conditionally writes to binlog */
3282
    if (!(res= mysql_rename_user(thd, lex->users_list)))
3283 3284 3285 3286 3287
      send_ok(thd);
    break;
  }
  case SQLCOM_REVOKE_ALL:
  {
3288
    if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1, 0) &&
3289
        check_global_access(thd,CREATE_USER_ACL))
3290
      break;
3291
    /* Conditionally writes to binlog */
3292 3293 3294 3295
    if (!(res = mysql_revoke_all(thd, lex->users_list)))
      send_ok(thd);
    break;
  }
3296 3297 3298 3299
  case SQLCOM_REVOKE:
  case SQLCOM_GRANT:
  {
    if (check_access(thd, lex->grant | lex->grant_tot_col | GRANT_ACL,
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3300
		     first_table ?  first_table->db : select_lex->db,
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VIEW  
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3301
		     first_table ? &first_table->grant.privilege : 0,
3302 3303 3304
		     first_table ? 0 : 1, 0,
                     first_table ? (bool) first_table->schema_table :
                     select_lex->db ? is_schema_db(select_lex->db) : 0))
3305 3306
      goto error;

3307
    if (thd->security_ctx->user)              // If not replication
unknown's avatar
unknown committed
3308
    {
3309
      LEX_USER *user, *tmp_user;
3310

unknown's avatar
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3311
      List_iterator <LEX_USER> user_list(lex->users_list);
3312
      while ((tmp_user= user_list++))
unknown's avatar
unknown committed
3313
      {
3314 3315
        if (!(user= get_current_user(thd, tmp_user)))
          goto error;
3316 3317 3318 3319 3320 3321 3322 3323
        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);
3324
        if (strcmp(thd->security_ctx->user, user->user.str) ||
3325
            my_strcasecmp(system_charset_info,
3326
                          user->host.str, thd->security_ctx->host_or_ip))
3327 3328
        {
          // TODO: use check_change_password()
3329 3330
          if (is_acl_user(user->host.str, user->user.str) &&
              user->password.str &&
3331
              check_access(thd, UPDATE_ACL,"mysql",0,1,1,0))
3332 3333 3334 3335 3336 3337
          {
            my_message(ER_PASSWORD_NOT_ALLOWED,
                       ER(ER_PASSWORD_NOT_ALLOWED), MYF(0));
            goto error;
          }
        }
unknown's avatar
SCRUM  
unknown committed
3338 3339
      }
    }
unknown's avatar
VIEW  
unknown committed
3340
    if (first_table)
3341
    {
3342 3343
      if (lex->type == TYPE_ENUM_PROCEDURE ||
          lex->type == TYPE_ENUM_FUNCTION)
3344 3345 3346 3347 3348
      {
        uint grants= lex->all_privileges 
		   ? (PROC_ACLS & ~GRANT_ACL) | (lex->grant & GRANT_ACL)
		   : lex->grant;
        if (grant_option && 
3349 3350
	    check_grant_routine(thd, grants | GRANT_ACL, all_tables,
                                lex->type == TYPE_ENUM_PROCEDURE, 0))
3351
	  goto error;
3352
        /* Conditionally writes to binlog */
3353 3354 3355 3356
        res= mysql_routine_grant(thd, all_tables,
                                 lex->type == TYPE_ENUM_PROCEDURE, 
                                 lex->users_list, grants,
                                 lex->sql_command == SQLCOM_REVOKE, 0);
3357 3358 3359 3360 3361 3362 3363 3364
      }
      else
      {
	if (grant_option && check_grant(thd,
					(lex->grant | lex->grant_tot_col |
					 GRANT_ACL),
					all_tables, 0, UINT_MAX, 0))
	  goto error;
3365
        /* Conditionally writes to binlog */
3366 3367 3368 3369
        res= mysql_table_grant(thd, all_tables, lex->users_list,
			       lex->columns, lex->grant,
			       lex->sql_command == SQLCOM_REVOKE);
      }
3370 3371 3372
    }
    else
    {
3373
      if (lex->columns.elements || lex->type)
3374
      {
unknown's avatar
unknown committed
3375 3376
	my_message(ER_ILLEGAL_GRANT_FOR_TABLE, ER(ER_ILLEGAL_GRANT_FOR_TABLE),
                   MYF(0));
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unknown committed
3377
        goto error;
3378 3379
      }
      else
3380
	/* Conditionally writes to binlog */
3381 3382 3383 3384
	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
			  lex->sql_command == SQLCOM_REVOKE);
      if (!res)
      {
3385
	if (lex->sql_command == SQLCOM_GRANT)
3386
	{
unknown's avatar
unknown committed
3387
	  List_iterator <LEX_USER> str_list(lex->users_list);
3388 3389 3390 3391 3392
	  LEX_USER *user, *tmp_user;
	  while ((tmp_user=str_list++))
          {
            if (!(user= get_current_user(thd, tmp_user)))
              goto error;
3393
	    reset_mqh(user, 0);
3394
          }
3395
	}
3396 3397 3398 3399
      }
    }
    break;
  }
unknown's avatar
SCRUM  
unknown committed
3400
#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/
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3401
  case SQLCOM_RESET:
3402 3403 3404
    /*
      RESET commands are never written to the binary log, so we have to
      initialize this variable because RESET shares the same code as FLUSH
3405 3406 3407 3408
    */
    lex->no_write_to_binlog= 1;
  case SQLCOM_FLUSH:
  {
unknown's avatar
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3409
    bool write_to_binlog;
unknown's avatar
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3410
    if (check_global_access(thd,RELOAD_ACL))
unknown's avatar
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3411
      goto error;
3412

3413 3414 3415 3416
    /*
      reload_acl_and_cache() will tell us if we are allowed to write to the
      binlog or not.
    */
unknown's avatar
unknown committed
3417
    if (!reload_acl_and_cache(thd, lex->type, first_table, &write_to_binlog))
3418 3419 3420 3421 3422
    {
      /*
        We WANT to write and we CAN write.
        ! we write after unlocking the table.
      */
3423 3424 3425
      /*
        Presumably, RESET and binlog writing doesn't require synchronization
      */
3426 3427 3428 3429
      if (!lex->no_write_to_binlog && write_to_binlog)
      {
        if (mysql_bin_log.is_open())
        {
unknown's avatar
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3430 3431
          thd->binlog_query(THD::STMT_QUERY_TYPE,
                            thd->query, thd->query_length, 0, FALSE);
3432 3433 3434
        }
      }
      send_ok(thd);
3435 3436
    } 
    
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3437
    break;
3438
  }
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3439
  case SQLCOM_KILL:
3440 3441 3442
  {
    Item *it= (Item *)lex->value_list.head();

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3443 3444 3445 3446 3447 3448 3449
    if (lex->table_or_sp_used())
    {
      my_error(ER_NOT_SUPPORTED_YET, MYF(0), "Usage of subqueries or stored "
               "function calls as part of this statement");
      break;
    }

3450
    if ((!it->fixed && it->fix_fields(lex->thd, &it)) || it->check_cols(1))
3451 3452 3453 3454 3455
    {
      my_message(ER_SET_CONSTANTS_ONLY, ER(ER_SET_CONSTANTS_ONLY),
		 MYF(0));
      goto error;
    }
3456
    sql_kill(thd, (ulong)it->val_int(), lex->type & ONLY_KILL_QUERY);
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3457
    break;
3458
  }
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3459
#ifndef NO_EMBEDDED_ACCESS_CHECKS
unknown's avatar
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3460
  case SQLCOM_SHOW_GRANTS:
3461 3462 3463 3464
  {
    LEX_USER *grant_user= get_current_user(thd, lex->grant_user);
    if (!grant_user)
      goto error;
3465
    if ((thd->security_ctx->priv_user &&
3466
	 !strcmp(thd->security_ctx->priv_user, grant_user->user.str)) ||
3467
	!check_access(thd, SELECT_ACL, "mysql",0,1,0,0))
unknown's avatar
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3468
    {
3469
      res = mysql_show_grants(thd, grant_user);
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3470 3471
    }
    break;
3472
  }
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3473
#endif
3474
  case SQLCOM_HA_OPEN:
unknown's avatar
VIEW  
unknown committed
3475
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
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3476
    if (check_table_access(thd, SELECT_ACL, all_tables, 0))
3477
      goto error;
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3478
    res= mysql_ha_open(thd, first_table, 0);
3479 3480
    break;
  case SQLCOM_HA_CLOSE:
unknown's avatar
VIEW  
unknown committed
3481 3482
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    res= mysql_ha_close(thd, first_table);
3483 3484
    break;
  case SQLCOM_HA_READ:
unknown's avatar
VIEW  
unknown committed
3485
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3486 3487 3488 3489 3490
    /*
      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.
    */
3491
    unit->set_limit(select_lex);
3492
    res= mysql_ha_read(thd, first_table, lex->ha_read_mode, lex->ident.str,
unknown's avatar
VIEW  
unknown committed
3493
                       lex->insert_list, lex->ha_rkey_mode, select_lex->where,
3494
                       unit->select_limit_cnt, unit->offset_limit_cnt);
3495 3496
    break;

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3497
  case SQLCOM_BEGIN:
3498 3499 3500 3501 3502 3503
    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;
    }
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3504
    if (begin_trans(thd))
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3505
      goto error;
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3506
    send_ok(thd);
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3507 3508
    break;
  case SQLCOM_COMMIT:
3509
    if (end_trans(thd, lex->tx_release ? COMMIT_RELEASE :
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3510
                              lex->tx_chain ? COMMIT_AND_CHAIN : COMMIT))
unknown's avatar
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3511
      goto error;
3512
    send_ok(thd);
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3513 3514
    break;
  case SQLCOM_ROLLBACK:
3515
    if (end_trans(thd, lex->tx_release ? ROLLBACK_RELEASE :
unknown's avatar
unknown committed
3516
                              lex->tx_chain ? ROLLBACK_AND_CHAIN : ROLLBACK))
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3517
      goto error;
3518
    send_ok(thd);
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3519
    break;
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3520
  case SQLCOM_RELEASE_SAVEPOINT:
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3521
  {
3522 3523
    SAVEPOINT *sv;
    for (sv=thd->transaction.savepoints; sv; sv=sv->prev)
unknown's avatar
unknown committed
3524 3525 3526
    {
      if (my_strnncoll(system_charset_info,
                       (uchar *)lex->ident.str, lex->ident.length,
3527
                       (uchar *)sv->name, sv->length) == 0)
unknown's avatar
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3528 3529
        break;
    }
3530
    if (sv)
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3531
    {
3532
      if (ha_release_savepoint(thd, sv))
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3533
        res= TRUE; // cannot happen
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unknown committed
3534 3535
      else
        send_ok(thd);
3536
      thd->transaction.savepoints=sv->prev;
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3537
    }
3538
    else
unknown's avatar
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3539
      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str);
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3540
    break;
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3541
  }
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3542
  case SQLCOM_ROLLBACK_TO_SAVEPOINT:
unknown's avatar
unknown committed
3543
  {
3544 3545
    SAVEPOINT *sv;
    for (sv=thd->transaction.savepoints; sv; sv=sv->prev)
3546 3547 3548
    {
      if (my_strnncoll(system_charset_info,
                       (uchar *)lex->ident.str, lex->ident.length,
3549
                       (uchar *)sv->name, sv->length) == 0)
3550 3551
        break;
    }
3552
    if (sv)
3553
    {
3554
      if (ha_rollback_to_savepoint(thd, sv))
3555 3556
        res= TRUE; // cannot happen
      else
unknown's avatar
unknown committed
3557
      {
3558
        if (((thd->options & OPTION_KEEP_LOG) || thd->no_trans_update.all) &&
unknown's avatar
unknown committed
3559 3560 3561 3562 3563 3564
            !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);
      }
3565
      thd->transaction.savepoints=sv;
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3566 3567
    }
    else
3568
      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str);
unknown's avatar
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3569
    break;
3570
  }
3571
  case SQLCOM_SAVEPOINT:
3572 3573
    if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN) ||
          thd->in_sub_stmt) || !opt_using_transactions)
unknown's avatar
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3574
      send_ok(thd);
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unknown committed
3575
    else
3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613
    {
      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);
      }
    }
unknown's avatar
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3614
    break;
3615 3616
  case SQLCOM_CREATE_PROCEDURE:
  case SQLCOM_CREATE_SPFUNCTION:
unknown's avatar
unknown committed
3617
  {
3618
    uint namelen;
unknown's avatar
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3619
    char *name;
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3620
    int sp_result= SP_INTERNAL_ERROR;
3621

3622
    DBUG_ASSERT(lex->sphead != 0);
unknown's avatar
unknown committed
3623
    DBUG_ASSERT(lex->sphead->m_db.str); /* Must be initialized in the parser */
3624 3625 3626 3627
    /*
      Verify that the database name is allowed, optionally
      lowercase it.
    */
3628
    if (check_db_name(&lex->sphead->m_db))
3629
    {
3630
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->sphead->m_db.str);
3631
      goto create_sp_error;
3632 3633
    }

3634
    /*
3635 3636 3637
      Check that a database directory with this name
      exists. Design note: This won't work on virtual databases
      like information_schema.
3638 3639
    */
    if (check_db_dir_existence(lex->sphead->m_db.str))
3640
    {
3641
      my_error(ER_BAD_DB_ERROR, MYF(0), lex->sphead->m_db.str);
3642
      goto create_sp_error;
3643
    }
3644

3645 3646
    if (check_access(thd, CREATE_PROC_ACL, lex->sphead->m_db.str, 0, 0, 0,
                     is_schema_db(lex->sphead->m_db.str)))
3647
      goto create_sp_error;
3648

3649 3650
    if (end_active_trans(thd))
      goto create_sp_error;
3651 3652

    name= lex->sphead->name(&namelen);
3653
#ifdef HAVE_DLOPEN
unknown's avatar
unknown committed
3654 3655 3656
    if (lex->sphead->m_type == TYPE_ENUM_FUNCTION)
    {
      udf_func *udf = find_udf(name, namelen);
3657

unknown's avatar
unknown committed
3658
      if (udf)
3659
      {
3660 3661
        my_error(ER_UDF_EXISTS, MYF(0), name);
        goto create_sp_error;
3662
      }
unknown's avatar
unknown committed
3663 3664 3665
    }
#endif

3666 3667
    if (sp_process_definer(thd))
      goto create_sp_error;
3668

unknown's avatar
unknown committed
3669 3670
    res= (sp_result= lex->sphead->create(thd));
    switch (sp_result) {
3671
    case SP_OK:
unknown's avatar
unknown committed
3672
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3673
      /* only add privileges if really neccessary */
3674
      if (sp_automatic_privileges && !opt_noacl &&
3675
          check_routine_access(thd, DEFAULT_CREATE_PROC_ACLS,
3676
                               lex->sphead->m_db.str, name,
3677
                               lex->sql_command == SQLCOM_CREATE_PROCEDURE, 1))
3678
      {
unknown's avatar
unknown committed
3679
        if (sp_grant_privileges(thd, lex->sphead->m_db.str, name,
3680
                                lex->sql_command == SQLCOM_CREATE_PROCEDURE))
3681 3682 3683
          push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                       ER_PROC_AUTO_GRANT_FAIL,
                       ER(ER_PROC_AUTO_GRANT_FAIL));
unknown's avatar
unknown committed
3684
        close_thread_tables(thd);
3685
      }
unknown's avatar
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3686
#endif
unknown's avatar
unknown committed
3687
    break;
3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706
    case SP_WRITE_ROW_FAILED:
      my_error(ER_SP_ALREADY_EXISTS, MYF(0), SP_TYPE_STRING(lex), name);
    break;
    case SP_BAD_IDENTIFIER:
      my_error(ER_TOO_LONG_IDENT, MYF(0), name);
    break;
    case SP_BODY_TOO_LONG:
      my_error(ER_TOO_LONG_BODY, MYF(0), name);
    break;
    default:
      my_error(ER_SP_STORE_FAILED, MYF(0), SP_TYPE_STRING(lex), name);
    break;
    } /* end switch */

    /*
      Capture all errors within this CASE and
      clean up the environment.
    */
create_sp_error:
unknown's avatar
unknown committed
3707
    if (sp_result != SP_OK )
3708 3709 3710 3711
      goto error;
    send_ok(thd);
    break; /* break super switch */
  } /* end case group bracket */
3712 3713 3714 3715
  case SQLCOM_CALL:
    {
      sp_head *sp;

3716 3717 3718 3719 3720 3721 3722 3723 3724
      /*
        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;

      /*
3725 3726
        By this moment all needed SPs should be in cache so no need to look 
        into DB. 
3727
      */
3728 3729
      if (!(sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname,
                                &thd->sp_proc_cache, TRUE)))
3730
      {
3731
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "PROCEDURE",
unknown's avatar
unknown committed
3732
                 lex->spname->m_qname.str);
3733
	goto error;
3734 3735 3736
      }
      else
      {
unknown's avatar
unknown committed
3737
	ha_rows select_limit;
unknown's avatar
unknown committed
3738 3739
        /* bits that should be cleared in thd->server_status */
	uint bits_to_be_cleared= 0;
3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751
        /*
          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;
        }
3752

3753 3754
	my_bool nsok= thd->net.no_send_ok;
	thd->net.no_send_ok= TRUE;
3755
	if (sp->m_flags & sp_head::MULTI_RESULTS)
3756
	{
3757
	  if (! (thd->client_capabilities & CLIENT_MULTI_RESULTS))
3758
	  {
3759 3760 3761 3762
            /*
              The client does not support multiple result sets being sent
              back
            */
3763
	    my_error(ER_SP_BADSELECT, MYF(0), sp->m_qname.str);
3764 3765 3766
	    thd->net.no_send_ok= nsok;
	    goto error;
	  }
unknown's avatar
unknown committed
3767 3768 3769 3770 3771 3772 3773
          /*
            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;
3774 3775
	}

3776
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3777
	if (check_routine_access(thd, EXECUTE_ACL,
3778
				 sp->m_db.str, sp->m_name.str, TRUE, FALSE))
3779 3780 3781 3782
	{
	  thd->net.no_send_ok= nsok;
	  goto error;
	}
3783
#endif
unknown's avatar
unknown committed
3784 3785
	select_limit= thd->variables.select_limit;
	thd->variables.select_limit= HA_POS_ERROR;
3786

3787
        /* 
3788
          We never write CALL statements into binlog:
3789 3790 3791 3792 3793
           - 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.
3794
        */
3795
	res= sp->execute_procedure(thd, &lex->value_list);
3796 3797 3798
	/*
          If warnings have been cleared, we have to clear total_warn_count
          too, otherwise the clients get confused.
3799 3800 3801 3802
	 */
	if (thd->warn_list.is_empty())
	  thd->total_warn_count= 0;

unknown's avatar
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3803
	thd->variables.select_limit= select_limit;
3804

3805
	thd->net.no_send_ok= nsok;
unknown's avatar
unknown committed
3806
        thd->server_status&= ~bits_to_be_cleared;
3807

unknown's avatar
unknown committed
3808
	if (!res)
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3809 3810
	  send_ok(thd, (ulong) (thd->row_count_func < 0 ? 0 :
                                thd->row_count_func));
3811
	else
3812 3813
        {
          DBUG_ASSERT(thd->net.report_error == 1 || thd->killed);
3814
	  goto error;		// Substatement should already have sent error
3815
        }
3816
      }
3817
      break;
3818 3819
    }
  case SQLCOM_ALTER_PROCEDURE:
3820
  case SQLCOM_ALTER_FUNCTION:
3821
    {
unknown's avatar
unknown committed
3822
      int sp_result;
3823 3824 3825 3826
      sp_head *sp;
      st_sp_chistics chistics;

      memcpy(&chistics, &lex->sp_chistics, sizeof(chistics));
unknown's avatar
unknown committed
3827
      if (lex->sql_command == SQLCOM_ALTER_PROCEDURE)
3828 3829
        sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname,
                            &thd->sp_proc_cache, FALSE);
3830
      else
3831 3832
        sp= sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname,
                            &thd->sp_func_cache, FALSE);
unknown's avatar
unknown committed
3833
      mysql_reset_errors(thd, 0);
3834
      if (! sp)
3835 3836
      {
	if (lex->spname->m_db.str)
unknown's avatar
unknown committed
3837
	  sp_result= SP_KEY_NOT_FOUND;
3838 3839 3840 3841 3842 3843
	else
	{
	  my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
	  goto error;
	}
      }
3844 3845
      else
      {
3846 3847 3848
        if (check_routine_access(thd, ALTER_PROC_ACL, sp->m_db.str, 
				 sp->m_name.str,
                                 lex->sql_command == SQLCOM_ALTER_PROCEDURE, 0))
3849
	  goto error;
3850 3851 3852

        if (end_active_trans(thd)) 
          goto error;
3853
	memcpy(&lex->sp_chistics, &chistics, sizeof(lex->sp_chistics));
3854 3855
        if ((sp->m_type == TYPE_ENUM_FUNCTION) &&
            !trust_function_creators &&  mysql_bin_log.is_open() &&
3856 3857 3858 3859 3860 3861
            !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));
unknown's avatar
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3862
          sp_result= SP_INTERNAL_ERROR;
3863 3864 3865
        }
        else
        {
3866 3867 3868 3869 3870 3871
          /*
            Note that if you implement the capability of ALTER FUNCTION to
            alter the body of the function, this command should be made to
            follow the restrictions that log-bin-trust-function-creators=0
            already puts on CREATE FUNCTION.
          */
unknown's avatar
unknown committed
3872
          /* Conditionally writes to binlog */
3873
          if (lex->sql_command == SQLCOM_ALTER_PROCEDURE)
unknown's avatar
unknown committed
3874 3875
            sp_result= sp_update_procedure(thd, lex->spname,
                                           &lex->sp_chistics);
3876
          else
unknown's avatar
unknown committed
3877
            sp_result= sp_update_function(thd, lex->spname, &lex->sp_chistics);
3878
        }
3879
      }
unknown's avatar
unknown committed
3880
      switch (sp_result)
3881
      {
unknown's avatar
unknown committed
3882
      case SP_OK:
3883
	send_ok(thd);
unknown's avatar
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3884 3885
	break;
      case SP_KEY_NOT_FOUND:
3886 3887
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
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unknown committed
3888 3889
	goto error;
      default:
3890 3891
	my_error(ER_SP_CANT_ALTER, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
unknown's avatar
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3892
	goto error;
3893
      }
3894
      break;
3895 3896
    }
  case SQLCOM_DROP_PROCEDURE:
3897
  case SQLCOM_DROP_FUNCTION:
3898
    {
unknown's avatar
unknown committed
3899
      int sp_result;
3900 3901
      int type= (lex->sql_command == SQLCOM_DROP_PROCEDURE ?
                 TYPE_ENUM_PROCEDURE : TYPE_ENUM_FUNCTION);
3902

unknown's avatar
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3903
      sp_result= sp_routine_exists_in_table(thd, type, lex->spname);
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3904
      mysql_reset_errors(thd, 0);
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3905
      if (sp_result == SP_OK)
3906
      {
3907 3908 3909
        char *db= lex->spname->m_db.str;
	char *name= lex->spname->m_name.str;

3910 3911
	if (check_routine_access(thd, ALTER_PROC_ACL, db, name,
                                 lex->sql_command == SQLCOM_DROP_PROCEDURE, 0))
unknown's avatar
merge  
unknown committed
3912
          goto error;
3913 3914 3915

        if (end_active_trans(thd)) 
          goto error;
unknown's avatar
unknown committed
3916
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3917
	if (sp_automatic_privileges && !opt_noacl &&
3918 3919
	    sp_revoke_privileges(thd, db, name, 
                                 lex->sql_command == SQLCOM_DROP_PROCEDURE))
3920 3921 3922 3923 3924
	{
	  push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 
		       ER_PROC_AUTO_REVOKE_FAIL,
		       ER(ER_PROC_AUTO_REVOKE_FAIL));
	}
unknown's avatar
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3925
#endif
unknown's avatar
unknown committed
3926
        /* Conditionally writes to binlog */
3927
	if (lex->sql_command == SQLCOM_DROP_PROCEDURE)
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3928
	  sp_result= sp_drop_procedure(thd, lex->spname);
3929
	else
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3930
	  sp_result= sp_drop_function(thd, lex->spname);
3931 3932 3933
      }
      else
      {
3934
#ifdef HAVE_DLOPEN
3935 3936 3937 3938 3939 3940
	if (lex->sql_command == SQLCOM_DROP_FUNCTION)
	{
          udf_func *udf = find_udf(lex->spname->m_name.str,
                                   lex->spname->m_name.length);
          if (udf)
          {
3941
	    if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 0, 0))
3942
	      goto error;
3943

3944
	    if (!(res = mysql_drop_function(thd, &lex->spname->m_name)))
3945
	    {
3946 3947
	      send_ok(thd);
	      break;
3948 3949
	    }
	  }
3950
	}
3951
#endif
3952
	if (lex->spname->m_db.str)
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3953
	  sp_result= SP_KEY_NOT_FOUND;
3954 3955 3956 3957 3958
	else
	{
	  my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
	  goto error;
	}
3959
      }
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3960 3961
      res= sp_result;
      switch (sp_result) {
3962
      case SP_OK:
3963
	send_ok(thd);
3964 3965
	break;
      case SP_KEY_NOT_FOUND:
3966 3967
	if (lex->drop_if_exists)
	{
3968
	  push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
3969
			      ER_SP_DOES_NOT_EXIST, ER(ER_SP_DOES_NOT_EXIST),
3970
			      SP_COM_STRING(lex), lex->spname->m_name.str);
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3971
	  res= FALSE;
3972 3973 3974
	  send_ok(thd);
	  break;
	}
3975 3976
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
3977 3978
	goto error;
      default:
3979 3980
	my_error(ER_SP_DROP_FAILED, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
3981
	goto error;
3982
      }
3983
      break;
3984
    }
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3985 3986
  case SQLCOM_SHOW_CREATE_PROC:
    {
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3987
      if (sp_show_create_procedure(thd, lex->spname) != SP_OK)
3988
      {			/* We don't distinguish between errors for now */
3989 3990
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
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3991 3992 3993 3994 3995 3996
	goto error;
      }
      break;
    }
  case SQLCOM_SHOW_CREATE_FUNC:
    {
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3997
      if (sp_show_create_function(thd, lex->spname) != SP_OK)
3998
      {			/* We don't distinguish between errors for now */
3999 4000
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
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4001 4002 4003 4004
	goto error;
      }
      break;
    }
4005
#ifdef NOT_USED
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4006 4007
  case SQLCOM_SHOW_STATUS_PROC:
    {
4008
      res= sp_show_status_procedure(thd, (lex->wild ?
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4009 4010 4011 4012 4013
					  lex->wild->ptr() : NullS));
      break;
    }
  case SQLCOM_SHOW_STATUS_FUNC:
    {
4014
      res= sp_show_status_function(thd, (lex->wild ? 
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4015 4016 4017
					 lex->wild->ptr() : NullS));
      break;
    }
4018
#endif
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4019 4020 4021 4022 4023 4024 4025
#ifndef DBUG_OFF
  case SQLCOM_SHOW_PROC_CODE:
  case SQLCOM_SHOW_FUNC_CODE:
    {
      sp_head *sp;

      if (lex->sql_command == SQLCOM_SHOW_PROC_CODE)
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4026 4027
        sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname,
                            &thd->sp_proc_cache, FALSE);
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4028
      else
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4029 4030
        sp= sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname,
                            &thd->sp_func_cache, FALSE);
4031
      if (!sp || sp->show_routine_code(thd))
4032 4033
      {
        /* We don't distinguish between errors for now */
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4034 4035 4036 4037 4038 4039 4040
        my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
        goto error;
      }
      break;
    }
#endif // ifndef DBUG_OFF
unknown's avatar
VIEW  
unknown committed
4041 4042
  case SQLCOM_CREATE_VIEW:
    {
4043 4044 4045
      if (end_active_trans(thd))
        goto error;

4046
      res= mysql_create_view(thd, first_table, thd->lex->create_view_mode);
unknown's avatar
VIEW  
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4047 4048 4049 4050
      break;
    }
  case SQLCOM_DROP_VIEW:
    {
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4051 4052 4053
      if (check_table_access(thd, DROP_ACL, all_tables, 0) ||
          end_active_trans(thd))
        goto error;
4054 4055
      /* Conditionally writes to binlog. */
      res= mysql_drop_view(thd, first_table, thd->lex->drop_mode);
unknown's avatar
VIEW  
unknown committed
4056 4057
      break;
    }
4058 4059
  case SQLCOM_CREATE_TRIGGER:
  {
4060 4061 4062
    if (end_active_trans(thd))
      goto error;

4063
    /* Conditionally writes to binlog. */
4064 4065
    res= mysql_create_or_drop_trigger(thd, all_tables, 1);

4066 4067 4068 4069
    break;
  }
  case SQLCOM_DROP_TRIGGER:
  {
4070 4071 4072
    if (end_active_trans(thd))
      goto error;

4073
    /* Conditionally writes to binlog. */
4074 4075 4076
    res= mysql_create_or_drop_trigger(thd, all_tables, 0);
    break;
  }
4077
  case SQLCOM_XA_START:
4078 4079
    if (thd->transaction.xid_state.xa_state == XA_IDLE &&
        thd->lex->xa_opt == XA_RESUME)
4080
    {
4081
      if (! thd->transaction.xid_state.xid.eq(thd->lex->xid))
4082 4083 4084 4085
      {
        my_error(ER_XAER_NOTA, MYF(0));
        break;
      }
4086
      thd->transaction.xid_state.xa_state=XA_ACTIVE;
4087 4088 4089
      send_ok(thd);
      break;
    }
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4090
    if (thd->lex->xa_opt != XA_NONE)
4091 4092 4093 4094
    { // JOIN is not supported yet. TODO
      my_error(ER_XAER_INVAL, MYF(0));
      break;
    }
4095
    if (thd->transaction.xid_state.xa_state != XA_NOTR)
4096
    {
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4097
      my_error(ER_XAER_RMFAIL, MYF(0),
4098
               xa_state_names[thd->transaction.xid_state.xa_state]);
4099 4100 4101 4102 4103 4104 4105
      break;
    }
    if (thd->active_transaction() || thd->locked_tables)
    {
      my_error(ER_XAER_OUTSIDE, MYF(0));
      break;
    }
4106 4107 4108 4109 4110 4111 4112 4113 4114
    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);
4115
    thd->options= ((thd->options & ~(OPTION_KEEP_LOG)) | OPTION_BEGIN);
4116
    thd->no_trans_update.all= FALSE;
4117 4118 4119 4120 4121 4122 4123 4124 4125 4126
    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;
    }
4127
    if (thd->transaction.xid_state.xa_state != XA_ACTIVE)
4128
    {
unknown's avatar
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4129
      my_error(ER_XAER_RMFAIL, MYF(0),
4130
               xa_state_names[thd->transaction.xid_state.xa_state]);
4131 4132
      break;
    }
4133
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4134 4135 4136 4137
    {
      my_error(ER_XAER_NOTA, MYF(0));
      break;
    }
4138
    thd->transaction.xid_state.xa_state=XA_IDLE;
4139 4140 4141
    send_ok(thd);
    break;
  case SQLCOM_XA_PREPARE:
4142
    if (thd->transaction.xid_state.xa_state != XA_IDLE)
4143
    {
unknown's avatar
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4144
      my_error(ER_XAER_RMFAIL, MYF(0),
4145
               xa_state_names[thd->transaction.xid_state.xa_state]);
4146 4147
      break;
    }
4148
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4149 4150 4151 4152 4153 4154 4155
    {
      my_error(ER_XAER_NOTA, MYF(0));
      break;
    }
    if (ha_prepare(thd))
    {
      my_error(ER_XA_RBROLLBACK, MYF(0));
4156 4157
      xid_cache_delete(&thd->transaction.xid_state);
      thd->transaction.xid_state.xa_state=XA_NOTR;
4158 4159
      break;
    }
4160
    thd->transaction.xid_state.xa_state=XA_PREPARED;
4161 4162 4163
    send_ok(thd);
    break;
  case SQLCOM_XA_COMMIT:
4164
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4165
    {
4166 4167
      XID_STATE *xs=xid_cache_search(thd->lex->xid);
      if (!xs || xs->in_thd)
4168
        my_error(ER_XAER_NOTA, MYF(0));
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unknown committed
4169
      else
4170 4171 4172
      {
        ha_commit_or_rollback_by_xid(thd->lex->xid, 1);
        xid_cache_delete(xs);
unknown's avatar
unknown committed
4173
        send_ok(thd);
4174
      }
4175 4176
      break;
    }
4177
    if (thd->transaction.xid_state.xa_state == XA_IDLE &&
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unknown committed
4178
        thd->lex->xa_opt == XA_ONE_PHASE)
4179
    {
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4180 4181 4182
      int r;
      if ((r= ha_commit(thd)))
        my_error(r == 1 ? ER_XA_RBROLLBACK : ER_XAER_RMERR, MYF(0));
4183 4184 4185
      else
        send_ok(thd);
    }
4186
    else if (thd->transaction.xid_state.xa_state == XA_PREPARED &&
unknown's avatar
unknown committed
4187
             thd->lex->xa_opt == XA_NONE)
4188
    {
4189 4190 4191
      if (wait_if_global_read_lock(thd, 0, 0))
      {
        ha_rollback(thd);
4192
        my_error(ER_XAER_RMERR, MYF(0));
4193
      }
4194
      else
4195 4196 4197 4198 4199 4200 4201
      {
        if (ha_commit_one_phase(thd, 1))
          my_error(ER_XAER_RMERR, MYF(0));
        else
          send_ok(thd);
        start_waiting_global_read_lock(thd);
      }
4202 4203 4204
    }
    else
    {
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4205
      my_error(ER_XAER_RMFAIL, MYF(0),
4206
               xa_state_names[thd->transaction.xid_state.xa_state]);
4207 4208
      break;
    }
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4209 4210
    thd->options&= ~(OPTION_BEGIN | OPTION_KEEP_LOG);
    thd->no_trans_update.all= FALSE;
4211
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
4212 4213
    xid_cache_delete(&thd->transaction.xid_state);
    thd->transaction.xid_state.xa_state=XA_NOTR;
4214 4215
    break;
  case SQLCOM_XA_ROLLBACK:
4216
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4217
    {
4218 4219
      XID_STATE *xs=xid_cache_search(thd->lex->xid);
      if (!xs || xs->in_thd)
4220
        my_error(ER_XAER_NOTA, MYF(0));
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unknown committed
4221
      else
4222 4223 4224
      {
        ha_commit_or_rollback_by_xid(thd->lex->xid, 0);
        xid_cache_delete(xs);
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unknown committed
4225
        send_ok(thd);
4226
      }
4227 4228
      break;
    }
4229 4230
    if (thd->transaction.xid_state.xa_state != XA_IDLE &&
        thd->transaction.xid_state.xa_state != XA_PREPARED)
4231
    {
unknown's avatar
unknown committed
4232
      my_error(ER_XAER_RMFAIL, MYF(0),
4233
               xa_state_names[thd->transaction.xid_state.xa_state]);
4234 4235 4236 4237 4238 4239
      break;
    }
    if (ha_rollback(thd))
      my_error(ER_XAER_RMERR, MYF(0));
    else
      send_ok(thd);
4240
    thd->options&= ~(OPTION_BEGIN | OPTION_KEEP_LOG);
4241
    thd->no_trans_update.all= FALSE;
4242
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
4243 4244
    xid_cache_delete(&thd->transaction.xid_state);
    thd->transaction.xid_state.xa_state=XA_NOTR;
4245 4246
    break;
  case SQLCOM_XA_RECOVER:
4247
    res= mysql_xa_recover(thd);
4248
    break;
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4249 4250 4251 4252 4253 4254 4255 4256 4257 4258 4259 4260 4261 4262 4263 4264 4265 4266 4267 4268 4269 4270 4271 4272
  case SQLCOM_ALTER_TABLESPACE:
    if (check_access(thd, ALTER_ACL, thd->db, 0, 1, 0, thd->db ? is_schema_db(thd->db) : 0))
      break;
    if (!(res= mysql_alter_tablespace(thd, lex->alter_tablespace_info)))
      send_ok(thd);
    break;
  case SQLCOM_INSTALL_PLUGIN:
    if (! (res= mysql_install_plugin(thd, &thd->lex->comment,
                                     &thd->lex->ident)))
      send_ok(thd);
    break;
  case SQLCOM_UNINSTALL_PLUGIN:
    if (! (res= mysql_uninstall_plugin(thd, &thd->lex->comment)))
      send_ok(thd);
    break;
  case SQLCOM_BINLOG_BASE64_EVENT:
  {
#ifndef EMBEDDED_LIBRARY
    mysql_client_binlog_statement(thd);
#else /* EMBEDDED_LIBRARY */
    my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "embedded");
#endif /* EMBEDDED_LIBRARY */
    break;
  }
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4273 4274 4275 4276 4277
  case SQLCOM_CREATE_SERVER:
  {
    int error;
    LEX *lex= thd->lex;
    DBUG_PRINT("info", ("case SQLCOM_CREATE_SERVER"));
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4278 4279 4280 4281

    if (check_global_access(thd, SUPER_ACL))
      break;

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4282 4283
    if ((error= create_server(thd, &lex->server_options)))
    {
4284
      DBUG_PRINT("info", ("problem creating server <%s>",
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4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296
                          lex->server_options.server_name));
      my_error(error, MYF(0), lex->server_options.server_name);
      break;
    }
    send_ok(thd, 1);
    break;
  }
  case SQLCOM_ALTER_SERVER:
  {
    int error;
    LEX *lex= thd->lex;
    DBUG_PRINT("info", ("case SQLCOM_ALTER_SERVER"));
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4297 4298 4299 4300

    if (check_global_access(thd, SUPER_ACL))
      break;

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4301 4302
    if ((error= alter_server(thd, &lex->server_options)))
    {
4303
      DBUG_PRINT("info", ("problem altering server <%s>",
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4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315
                          lex->server_options.server_name));
      my_error(error, MYF(0), lex->server_options.server_name);
      break;
    }
    send_ok(thd, 1);
    break;
  }
  case SQLCOM_DROP_SERVER:
  {
    int err_code;
    LEX *lex= thd->lex;
    DBUG_PRINT("info", ("case SQLCOM_DROP_SERVER"));
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4316 4317 4318 4319

    if (check_global_access(thd, SUPER_ACL))
      break;

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4320 4321
    if ((err_code= drop_server(thd, &lex->server_options)))
    {
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4322
      if (! lex->drop_if_exists && err_code == ER_FOREIGN_SERVER_DOESNT_EXIST)
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unknown committed
4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336
      {
        DBUG_PRINT("info", ("problem dropping server %s",
                            lex->server_options.server_name));
        my_error(err_code, MYF(0), lex->server_options.server_name);
      }
      else
      {
        send_ok(thd, 0);
      }
      break;
    }
    send_ok(thd, 1);
    break;
  }
4337
  default:
4338
#ifndef EMBEDDED_LIBRARY
4339
    DBUG_ASSERT(0);                             /* Impossible */
4340
#endif
4341
    send_ok(thd);
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4342 4343
    break;
  }
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4344

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4345
  thd->proc_info="query end";
4346 4347

  /*
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unknown committed
4348
    Binlog-related cleanup:
4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359
    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);

4360
  /*
4361 4362
    The return value for ROW_COUNT() is "implementation dependent" if the
    statement is not DELETE, INSERT or UPDATE, but -1 is what JDBC and ODBC
4363 4364 4365 4366
    wants. We also keep the last value in case of SQLCOM_CALL or
    SQLCOM_EXECUTE.
  */
  if (!(sql_command_flags[lex->sql_command] & CF_HAS_ROW_COUNT))
4367
    thd->row_count_func= -1;
4368

4369
  goto finish;
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4370 4371

error:
4372 4373
  res= TRUE;

4374
finish:
4375 4376 4377 4378 4379 4380 4381 4382 4383
  if (need_start_waiting)
  {
    /*
      Release the protection against the global read lock and wake
      everyone, who might want to set a global read lock.
    */
    start_waiting_global_read_lock(thd);
  }
  DBUG_RETURN(res || thd->net.report_error);
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4384 4385 4386
}


4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398 4399 4400 4401 4402 4403 4404 4405 4406 4407 4408 4409
static bool execute_sqlcom_select(THD *thd, TABLE_LIST *all_tables)
{
  LEX	*lex= thd->lex;
  select_result *result=lex->result;
  bool res;
  /* assign global limit variable if limit is not given */
  {
    SELECT_LEX *param= lex->unit.global_parameters;
    if (!param->explicit_limit)
      param->select_limit=
        new Item_int((ulonglong) thd->variables.select_limit);
  }
  if (!(res= open_and_lock_tables(thd, all_tables)))
  {
    if (lex->describe)
    {
      /*
        We always use select_send for EXPLAIN, even if it's an EXPLAIN
        for SELECT ... INTO OUTFILE: a user application should be able
        to prepend EXPLAIN to any query and receive output for it,
        even if the query itself redirects the output.
      */
      if (!(result= new select_send()))
4410
        return 1;                               /* purecov: inspected */
4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425 4426 4427 4428
      thd->send_explain_fields(result);
      res= mysql_explain_union(thd, &thd->lex->unit, result);
      if (lex->describe & DESCRIBE_EXTENDED)
      {
        char buff[1024];
        String str(buff,(uint32) sizeof(buff), system_charset_info);
        str.length(0);
        thd->lex->unit.print(&str);
        str.append('\0');
        push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
                     ER_YES, str.ptr());
      }
      result->send_eof();
      delete result;
    }
    else
    {
      if (!result && !(result= new select_send()))
4429
        return 1;                               /* purecov: inspected */
4430 4431 4432 4433 4434 4435 4436 4437 4438 4439
      query_cache_store_query(thd, all_tables);
      res= handle_select(thd, lex, result, 0);
      if (result != lex->result)
        delete result;
    }
  }
  return res;
}


unknown's avatar
unknown committed
4440
/*
4441
  Check grants for commands which work only with one table.
unknown's avatar
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4442

4443
  SYNOPSIS
4444
    check_single_table_access()
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unknown committed
4445
    thd			Thread handler
4446
    privilege		requested privilege
unknown's avatar
VIEW  
unknown committed
4447
    all_tables		global table list of query
4448 4449
    no_errors           FALSE/TRUE - report/don't report error to
                            the client (using my_error() call).
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4450 4451 4452

  RETURN
    0 - OK
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4453
    1 - access denied, error is sent to client
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unknown committed
4454 4455
*/

4456
bool check_single_table_access(THD *thd, ulong privilege, 
4457
                               TABLE_LIST *all_tables, bool no_errors)
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unknown committed
4458
{
4459 4460 4461 4462 4463 4464
  Security_context * backup_ctx= thd->security_ctx;

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

4465 4466 4467 4468 4469 4470 4471 4472
  const char *db_name;
  if ((all_tables->view || all_tables->field_translation) &&
      !all_tables->schema_table)
    db_name= all_tables->view_db.str;
  else
    db_name= all_tables->db;

  if (check_access(thd, privilege, db_name,
4473
		   &all_tables->grant.privilege, 0, no_errors,
4474
                   test(all_tables->schema_table)))
4475
    goto deny;
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4476

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4477
  /* Show only 1 table for check_grant */
4478 4479 4480
  if (grant_option &&
      !(all_tables->belong_to_view &&
        (thd->lex->sql_command == SQLCOM_SHOW_FIELDS)) &&
4481
      check_grant(thd, privilege, all_tables, 0, 1, no_errors))
4482 4483 4484
    goto deny;

  thd->security_ctx= backup_ctx;
4485 4486 4487 4488 4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508
  return 0;

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

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

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

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

bool check_one_table_access(THD *thd, ulong privilege, TABLE_LIST *all_tables)
{
4509
  if (check_single_table_access (thd,privilege,all_tables, FALSE))
4510
    return 1;
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4511

4512
  /* Check rights on tables of subselects and implictly opened tables */
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4513
  TABLE_LIST *subselects_tables, *view= all_tables->view ? all_tables : 0;
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VIEW  
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4514
  if ((subselects_tables= all_tables->next_global))
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4515
  {
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4516 4517 4518 4519 4520 4521
    /*
      Access rights asked for the first table of a view should be the same
      as for the view
    */
    if (view && subselects_tables->belong_to_view == view)
    {
4522
      if (check_single_table_access (thd, privilege, subselects_tables, FALSE))
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4523 4524 4525 4526 4527
        return 1;
      subselects_tables= subselects_tables->next_global;
    }
    if (subselects_tables &&
        (check_table_access(thd, SELECT_ACL, subselects_tables, 0)))
4528
      return 1;
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4529 4530
  }
  return 0;
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4531 4532 4533
}


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4534
/****************************************************************************
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4535
  Get the user (global) and database privileges for all used tables
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4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548

  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
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4549 4550
                is enough to satisfy the request and the global grants contains
                a SELECT grant.
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4551 4552 4553
****************************************************************************/

bool
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4554
check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
4555
	     bool dont_check_global_grants, bool no_errors, bool schema_db)
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4556
{
4557
  Security_context *sctx= thd->security_ctx;
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4558 4559
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  ulong db_access;
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4560
  bool  db_is_pattern= test(want_access & GRANT_ACL);
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4561 4562
#endif
  ulong dummy;
4563 4564
  DBUG_ENTER("check_access");
  DBUG_PRINT("enter",("db: %s  want_access: %lu  master_access: %lu",
4565
                      db ? db : "", want_access, sctx->master_access));
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4566 4567 4568 4569 4570
  if (save_priv)
    *save_priv=0;
  else
    save_priv= &dummy;

4571
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
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4572
  {
4573
    DBUG_PRINT("error",("No database"));
4574
    if (!no_errors)
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4575 4576
      my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR),
                 MYF(0));                       /* purecov: tested */
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4577
    DBUG_RETURN(TRUE);				/* purecov: tested */
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4578 4579
  }

4580 4581
  if (schema_db)
  {
4582 4583
    if (!(sctx->master_access & FILE_ACL) && (want_access & FILE_ACL) ||
        (want_access & ~(SELECT_ACL | EXTRA_ACL | FILE_ACL)))
4584 4585
    {
      if (!no_errors)
4586 4587
      {
        const char *db_name= db ? db : thd->db;
4588
        my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
4589 4590
                 sctx->priv_user, sctx->priv_host, db_name);
      }
4591 4592 4593 4594 4595 4596 4597 4598 4599
      DBUG_RETURN(TRUE);
    }
    else
    {
      *save_priv= SELECT_ACL;
      DBUG_RETURN(FALSE);
    }
  }

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4600 4601 4602
#ifdef NO_EMBEDDED_ACCESS_CHECKS
  DBUG_RETURN(0);
#else
4603
  if ((sctx->master_access & want_access) == want_access)
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4604
  {
4605 4606 4607 4608 4609
    /*
      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
    */
4610 4611
    db_access= sctx->db_access;
    if (!(sctx->master_access & SELECT_ACL) &&
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4612
	(db && (!thd->db || db_is_pattern || strcmp(db,thd->db))))
4613 4614 4615
      db_access=acl_get(sctx->host, sctx->ip, sctx->priv_user, db,
                        db_is_pattern);
    *save_priv=sctx->master_access | db_access;
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4616
    DBUG_RETURN(FALSE);
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4617
  }
4618
  if (((want_access & ~sctx->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
4619
      ! db && dont_check_global_grants)
unknown's avatar
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4620
  {						// We can never grant this
4621
    DBUG_PRINT("error",("No possible access"));
4622
    if (!no_errors)
4623
      my_error(ER_ACCESS_DENIED_ERROR, MYF(0),
4624 4625
               sctx->priv_user,
               sctx->priv_host,
4626 4627 4628
               (thd->password ?
                ER(ER_YES) :
                ER(ER_NO)));                    /* purecov: tested */
unknown's avatar
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4629
    DBUG_RETURN(TRUE);				/* purecov: tested */
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4630 4631 4632
  }

  if (db == any_db)
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4633
    DBUG_RETURN(FALSE);				// Allow select on anything
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4634

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4635
  if (db && (!thd->db || db_is_pattern || strcmp(db,thd->db)))
4636 4637
    db_access= acl_get(sctx->host, sctx->ip, sctx->priv_user, db,
                       db_is_pattern);
unknown's avatar
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4638
  else
4639
    db_access= sctx->db_access;
4640
  DBUG_PRINT("info",("db_access: %lu", db_access));
unknown's avatar
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4641
  /* Remove SHOW attribute and access rights we already have */
4642
  want_access &= ~(sctx->master_access | EXTRA_ACL);
4643 4644
  DBUG_PRINT("info",("db_access: %lu  want_access: %lu",
                     db_access, want_access));
4645
  db_access= ((*save_priv=(db_access | sctx->master_access)) & want_access);
4646 4647

  /* grant_option is set if there exists a single table or column grant */
unknown's avatar
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4648
  if (db_access == want_access ||
4649
      (grant_option && !dont_check_global_grants &&
4650
       !(want_access & ~(db_access | TABLE_ACLS | PROC_ACLS))))
unknown's avatar
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4651
    DBUG_RETURN(FALSE);				/* Ok */
4652 4653

  DBUG_PRINT("error",("Access denied"));
4654
  if (!no_errors)
4655
    my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
4656
             sctx->priv_user, sctx->priv_host,
4657 4658 4659
             (db ? db : (thd->db ?
                         thd->db :
                         "unknown")));          /* purecov: tested */
unknown's avatar
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4660
  DBUG_RETURN(TRUE);				/* purecov: tested */
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4661
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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4662 4663 4664
}


4665 4666 4667 4668 4669 4670 4671 4672 4673
/*
  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
4674
    One gets access right if one has ANY of the rights in want_access
4675 4676 4677 4678 4679 4680 4681 4682
    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
*/
unknown's avatar
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4683 4684

bool check_global_access(THD *thd, ulong want_access)
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4685
{
unknown's avatar
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4686 4687 4688
#ifdef NO_EMBEDDED_ACCESS_CHECKS
  return 0;
#else
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4689
  char command[128];
4690
  if ((thd->security_ctx->master_access & want_access))
unknown's avatar
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4691 4692
    return 0;
  get_privilege_desc(command, sizeof(command), want_access);
4693
  my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), command);
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4694
  return 1;
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4695
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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4696 4697 4698
}


4699 4700
static bool check_show_access(THD *thd, TABLE_LIST *table)
{
unknown's avatar
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4701
  switch (get_schema_table_idx(table->schema_table)) {
4702 4703
  case SCH_SCHEMATA:
    return (specialflag & SPECIAL_SKIP_SHOW_DB) &&
unknown's avatar
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4704
      check_global_access(thd, SHOW_DB_ACL);
4705 4706 4707 4708 4709

  case SCH_TABLE_NAMES:
  case SCH_TABLES:
  case SCH_VIEWS:
  case SCH_TRIGGERS:
unknown's avatar
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4710 4711 4712
  case SCH_EVENTS:
  {
    const char *dst_db_name= table->schema_select_lex->db;
4713

unknown's avatar
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4714
    DBUG_ASSERT(dst_db_name);
4715

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4716 4717 4718 4719
    if (check_access(thd, SELECT_ACL, dst_db_name,
                     &thd->col_access, FALSE, FALSE,
                     is_schema_db(dst_db_name)))
      return TRUE;
4720

unknown's avatar
unknown committed
4721 4722 4723 4724 4725 4726 4727
    if (!thd->col_access && check_grant_db(thd, dst_db_name))
    {
      my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
               thd->security_ctx->priv_user,
               thd->security_ctx->priv_host,
               dst_db_name);
      return TRUE;
4728 4729
    }

unknown's avatar
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4730 4731 4732
    return FALSE;
  }

4733 4734
  case SCH_COLUMNS:
  case SCH_STATISTICS:
unknown's avatar
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4735 4736 4737
  {
    TABLE_LIST *dst_table;
    dst_table= (TABLE_LIST *) table->schema_select_lex->table_list.first;
4738

unknown's avatar
unknown committed
4739
    DBUG_ASSERT(dst_table);
4740

unknown's avatar
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4741 4742 4743 4744 4745 4746
    if (check_access(thd, SELECT_ACL | EXTRA_ACL,
                     dst_table->db,
                     &dst_table->grant.privilege,
                     FALSE, FALSE,
                     test(dst_table->schema_table)))
      return FALSE;
4747

unknown's avatar
unknown committed
4748 4749 4750 4751
    return (grant_option &&
            check_grant(thd, SELECT_ACL, dst_table, 2, UINT_MAX, FALSE));
  }
  default:
4752 4753 4754 4755 4756 4757 4758
    break;
  }

  return FALSE;
}


unknown's avatar
unknown committed
4759
/*
4760 4761 4762 4763 4764 4765 4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 4777 4778 4779
  Check the privilege for all used tables.

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

  NOTES
    Table privileges are cached in the table list for GRANT checking.
    This functions assumes that table list used and
    thd->lex->query_tables_own_last value correspond to each other
    (the latter should be either 0 or point to next_global member
    of one of elements of this table list).

  RETURN VALUE
    FALSE - OK
    TRUE  - Access denied
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4780 4781
*/

4782
bool
unknown's avatar
unknown committed
4783
check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
4784
		   bool no_errors)
unknown's avatar
unknown committed
4785
{
unknown's avatar
unknown committed
4786 4787
  uint found=0;
  ulong found_access=0;
4788
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4789
  TABLE_LIST *org_tables= tables;
unknown's avatar
unknown committed
4790
#endif
4791
  TABLE_LIST *first_not_own_table= thd->lex->first_not_own_table();
4792
  Security_context *sctx= thd->security_ctx, *backup_ctx= thd->security_ctx;
4793
  /*
unknown's avatar
unknown committed
4794 4795 4796
    The check that first_not_own_table is not reached is for the case when
    the given table list refers to the list for prelocking (contains tables
    of other queries). For simple queries first_not_own_table is 0.
4797
  */
unknown's avatar
unknown committed
4798
  for (; tables != first_not_own_table; tables= tables->next_global)
unknown's avatar
unknown committed
4799
  {
4800 4801 4802 4803 4804
    if (tables->security_ctx)
      sctx= tables->security_ctx;
    else
      sctx= backup_ctx;

4805
    if (tables->schema_table && 
4806
        (want_access & ~(SELECT_ACL | EXTRA_ACL | FILE_ACL)))
4807 4808 4809
    {
      if (!no_errors)
        my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
4810
                 sctx->priv_user, sctx->priv_host,
4811
                 INFORMATION_SCHEMA_NAME.str);
4812 4813
      return TRUE;
    }
4814 4815 4816 4817 4818
    /*
       Register access for view underlying table.
       Remove SHOW_VIEW_ACL, because it will be checked during making view
     */
    tables->grant.orig_want_privilege= (want_access & ~SHOW_VIEW_ACL);
unknown's avatar
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4819 4820 4821 4822 4823 4824 4825 4826 4827 4828

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

      continue;
    }

    if (tables->derived ||
4829
        (tables->table && (int)tables->table->s->tmp_table))
unknown's avatar
unknown committed
4830
      continue;
4831 4832
    thd->security_ctx= sctx;
    if ((sctx->master_access & want_access) ==
4833
        (want_access & ~EXTRA_ACL) &&
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unknown committed
4834
	thd->db)
unknown's avatar
unknown committed
4835
      tables->grant.privilege= want_access;
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4836
    else if (tables->db && thd->db && strcmp(tables->db, thd->db) == 0)
unknown's avatar
unknown committed
4837 4838 4839 4840 4841
    {
      if (found && !grant_option)		// db already checked
	tables->grant.privilege=found_access;
      else
      {
4842
	if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
4843
			 0, no_errors, test(tables->schema_table)))
4844
	  goto deny;                            // Access denied
unknown's avatar
unknown committed
4845
	found_access=tables->grant.privilege;
unknown's avatar
unknown committed
4846
	found=1;
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unknown committed
4847 4848
      }
    }
4849
    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
4850
			  0, no_errors, test(tables->schema_table)))
4851
      goto deny;
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4852
  }
4853
  thd->security_ctx= backup_ctx;
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4854
  if (grant_option)
4855
    return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
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4856
		       test(want_access & EXTRA_ACL), UINT_MAX, no_errors);
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4857
  return FALSE;
4858 4859 4860
deny:
  thd->security_ctx= backup_ctx;
  return TRUE;
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4861 4862
}

4863

4864
bool
4865 4866
check_routine_access(THD *thd, ulong want_access,char *db, char *name,
		     bool is_proc, bool no_errors)
4867 4868 4869 4870 4871
{
  TABLE_LIST tables[1];
  
  bzero((char *)tables, sizeof(TABLE_LIST));
  tables->db= db;
4872
  tables->table_name= tables->alias= name;
4873
  
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4874 4875 4876 4877 4878 4879 4880
  /*
    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)
4881 4882
    tables->grant.privilege= want_access;
  else if (check_access(thd,want_access,db,&tables->grant.privilege,
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4883
			0, no_errors, 0))
4884 4885
    return TRUE;
  
unknown's avatar
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4886
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4887
  if (grant_option)
4888
    return check_grant_routine(thd, want_access, tables, is_proc, no_errors);
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4889
#endif
4890 4891 4892 4893

  return FALSE;
}

4894 4895 4896 4897 4898 4899 4900 4901 4902 4903 4904 4905 4906 4907 4908

/*
  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
*/

4909 4910
bool check_some_routine_access(THD *thd, const char *db, const char *name,
                               bool is_proc)
4911 4912
{
  ulong save_priv;
4913
  if (thd->security_ctx->master_access & SHOW_PROC_ACLS)
4914
    return FALSE;
4915 4916 4917 4918 4919
  /*
    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) ||
4920 4921
      (save_priv & SHOW_PROC_ACLS))
    return FALSE;
4922
  return check_routine_level_acl(thd, db, name, is_proc);
4923 4924 4925
}


4926 4927 4928 4929 4930 4931 4932 4933 4934 4935 4936 4937 4938 4939 4940 4941 4942 4943 4944 4945 4946 4947 4948 4949 4950
/*
  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,
4951 4952
                        &table->grant.privilege, 0, 1,
                        test(table->schema_table)) &&
4953 4954 4955 4956 4957 4958 4959 4960 4961
          !grant_option || !check_grant(thd, access, table, 0, 1, 1))
        DBUG_RETURN(0);
    }
  }
  DBUG_PRINT("exit",("no matching access rights"));
  DBUG_RETURN(1);
}


4962 4963
bool check_merge_table_access(THD *thd, char *db,
			      TABLE_LIST *table_list)
4964 4965 4966 4967
{
  int error=0;
  if (table_list)
  {
4968
    /* Check that all tables use the current database */
4969
    TABLE_LIST *tmp;
unknown's avatar
VIEW  
unknown committed
4970
    for (tmp= table_list; tmp; tmp= tmp->next_local)
4971 4972 4973 4974
    {
      if (!tmp->db || !tmp->db[0])
	tmp->db=db;
    }
4975
    error=check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
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4976
			     table_list,0);
4977 4978 4979 4980
  }
  return error;
}

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4981

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4982 4983 4984 4985 4986 4987 4988 4989 4990 4991
/****************************************************************************
	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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4992 4993 4994 4995
#ifndef DBUG_OFF
long max_stack_used;
#endif

4996
#ifndef EMBEDDED_LIBRARY
4997 4998 4999 5000 5001 5002 5003 5004
/*
  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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5005 5006
{
  long stack_used;
5007
  DBUG_ASSERT(thd == current_thd);
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5008
  if ((stack_used=used_stack(thd->thread_stack,(char*) &stack_used)) >=
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5009
      (long) (thread_stack - margin))
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  {
5011 5012 5013
    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));
5014
    thd->fatal_error();
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    return 1;
  }
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#ifndef DBUG_OFF
  max_stack_used= max(max_stack_used, stack_used);
#endif
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  return 0;
}
5022
#endif /* EMBEDDED_LIBRARY */
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5023 5024 5025 5026

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

5027
bool my_yyoverflow(short **yyss, YYSTYPE **yyvs, ulong *yystacksize)
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5028
{
5029
  LEX	*lex= current_thd->lex;
5030
  ulong old_info=0;
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5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047 5048 5049 5050 5051 5052 5053 5054 5055
  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;
}


5056 5057 5058 5059 5060 5061
/*
 Reset THD part responsible for command processing state.

 DESCRIPTION
   This needs to be called before execution of every statement
   (prepared or conventional).
5062
   It is not called by substatements of routines.
5063 5064 5065 5066 5067 5068 5069 5070 5071 5072

 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");
5073
  DBUG_ASSERT(!thd->spcont); /* not for substatements of routines */
5074
  thd->free_list= 0;
5075
  thd->select_number= 1;
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  /*
    Those two lines below are theoretically unneeded as
    THD::cleanup_after_query() should take care of this already.
  */
5080
  thd->auto_inc_intervals_in_cur_stmt_for_binlog.empty();
5081 5082 5083
  thd->stmt_depends_on_first_successful_insert_id_in_prev_stmt= 0;

  thd->query_start_used= 0;
5084
  thd->is_fatal_error= thd->time_zone_used= 0;
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  thd->server_status&= ~ (SERVER_MORE_RESULTS_EXISTS | 
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                          SERVER_QUERY_NO_INDEX_USED |
                          SERVER_QUERY_NO_GOOD_INDEX_USED);
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  /*
    If in autocommit mode and not in a transaction, reset
    OPTION_STATUS_NO_TRANS_UPDATE | OPTION_KEEP_LOG to not get warnings
    in ha_rollback_trans() about some tables couldn't be rolled back.
  */
  if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)))
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  {
    thd->options&= ~OPTION_KEEP_LOG;
    thd->no_trans_update.all= FALSE;
  }
5098
  DBUG_ASSERT(thd->security_ctx== &thd->main_security_ctx);
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5099
  thd->tmp_table_used= 0;
5100 5101
  if (!thd->in_sub_stmt)
  {
5102
    if (opt_bin_log)
5103
    {
5104
      reset_dynamic(&thd->user_var_events);
5105 5106
      thd->user_var_events_alloc= thd->mem_root;
    }
5107
    thd->clear_error();
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    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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  /*
    Because we come here only for start of top-statements, binlog format is
    constant inside a complex statement (using stored functions) etc.
  */
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  thd->reset_current_stmt_binlog_row_based();

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  DBUG_VOID_RETURN;
}

5121

5122 5123 5124
void
mysql_init_select(LEX *lex)
{
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  SELECT_LEX *select_lex= lex->current_select;
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  select_lex->init_select();
5127
  lex->wild= 0;
5128 5129
  if (select_lex == &lex->select_lex)
  {
5130
    DBUG_ASSERT(lex->result == 0);
5131 5132
    lex->exchange= 0;
  }
5133 5134
}

5135

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5136
bool
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mysql_new_select(LEX *lex, bool move_down)
5138
{
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  SELECT_LEX *select_lex;
5140
  THD *thd= lex->thd;
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  DBUG_ENTER("mysql_new_select");

5143
  if (!(select_lex= new (thd->mem_root) SELECT_LEX()))
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    DBUG_RETURN(1);
5145
  select_lex->select_number= ++thd->select_number;
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  select_lex->parent_lex= lex; /* Used in init_query. */
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  select_lex->init_query();
  select_lex->init_select();
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  lex->nest_level++;
  select_lex->nest_level= lex->nest_level;
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  /*
    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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5156
  if (thd->stmt_arena->is_stmt_prepare())
5157
    select_lex->uncacheable|= UNCACHEABLE_PREPARE;
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  if (move_down)
  {
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    SELECT_LEX_UNIT *unit;
5161
    lex->subqueries= TRUE;
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5162
    /* first select_lex of subselect or derived table */
5163
    if (!(unit= new (thd->mem_root) SELECT_LEX_UNIT()))
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      DBUG_RETURN(1);
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5165

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    unit->init_query();
    unit->init_select();
5168
    unit->thd= thd;
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5169
    unit->include_down(lex->current_select);
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    unit->link_next= 0;
    unit->link_prev= 0;
5172
    unit->return_to= lex->current_select;
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    select_lex->include_down(unit);
5174 5175 5176 5177 5178
    /*
      By default we assume that it is usual subselect and we have outer name
      resolution context, if no we will assign it to 0 later
    */
    select_lex->context.outer_context= &select_lex->outer_select()->context;
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  }
  else
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  {
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VIEW  
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5182 5183
    if (lex->current_select->order_list.first && !lex->current_select->braces)
    {
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      my_error(ER_WRONG_USAGE, MYF(0), "UNION", "ORDER BY");
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5185
      DBUG_RETURN(1);
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VIEW  
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5186
    }
5187
    select_lex->include_neighbour(lex->current_select);
5188 5189 5190 5191 5192
    SELECT_LEX_UNIT *unit= select_lex->master_unit();                              
    if (!unit->fake_select_lex && unit->add_fake_select_lex(lex->thd))
      DBUG_RETURN(1);
    select_lex->context.outer_context= 
                unit->first_select()->context.outer_context;
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5193
  }
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5194

5195
  select_lex->master_unit()->global_parameters= select_lex;
5196
  select_lex->include_global((st_select_lex_node**)&lex->all_selects_list);
5197
  lex->current_select= select_lex;
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  /*
    in subquery is SELECT query and we allow resolution of names in SELECT
    list
  */
  select_lex->context.resolve_in_select_list= TRUE;
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5203
  DBUG_RETURN(0);
5204
}
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5205

5206 5207 5208 5209 5210 5211 5212 5213 5214 5215 5216 5217 5218 5219 5220
/*
  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)
{
5221
  THD *thd;
5222
  LEX *lex;
5223
  LEX_STRING tmp, null_lex_string;
5224 5225
  Item *var;
  char buff[MAX_SYS_VAR_LENGTH*2+4+8], *end;
5226
  DBUG_ENTER("create_select_for_variable");
5227 5228

  thd= current_thd;
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  lex= thd->lex;
5230 5231 5232 5233
  mysql_init_select(lex);
  lex->sql_command= SQLCOM_SELECT;
  tmp.str= (char*) var_name;
  tmp.length=strlen(var_name);
5234
  bzero((char*) &null_lex_string.str, sizeof(null_lex_string));
5235 5236 5237 5238
  /*
    We set the name of Item to @@session.var_name because that then is used
    as the column name in the output.
  */
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  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);
  }
5245 5246 5247
  DBUG_VOID_RETURN;
}

5248

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5249 5250
void mysql_init_multi_delete(LEX *lex)
{
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5251
  lex->sql_command=  SQLCOM_DELETE_MULTI;
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5252
  mysql_init_select(lex);
5253 5254
  lex->select_lex.select_limit= 0;
  lex->unit.select_limit_cnt= HA_POS_ERROR;
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5255
  lex->select_lex.table_list.save_and_clear(&lex->auxiliary_table_list);
5256
  lex->lock_option= using_update_log ? TL_READ_NO_INSERT : TL_READ;
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VIEW  
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5257 5258
  lex->query_tables= 0;
  lex->query_tables_last= &lex->query_tables;
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5259
}
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5260

5261

5262 5263 5264 5265
/*
  When you modify mysql_parse(), you may need to mofify
  mysql_test_parse_for_slave() in this same file.
*/
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5266

5267 5268 5269 5270 5271 5272 5273 5274 5275 5276 5277
/**
  Parse a query.
  @param thd Current thread
  @param inBuf Begining of the query text
  @param length Length of the query text
  @param [out] semicolon For multi queries, position of the character of
  the next query in the query text.
*/

void mysql_parse(THD *thd, const char *inBuf, uint length,
                 const char ** found_semicolon)
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5278 5279
{
  DBUG_ENTER("mysql_parse");
5280 5281 5282

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

5283 5284 5285 5286 5287 5288 5289 5290 5291 5292 5293 5294 5295 5296 5297 5298 5299 5300
  /*
    Warning.
    The purpose of query_cache_send_result_to_client() is to lookup the
    query in the query cache first, to avoid parsing and executing it.
    So, the natural implementation would be to:
    - first, call query_cache_send_result_to_client,
    - second, if caching failed, initialise the lexical and syntactic parser.
    The problem is that the query cache depends on a clean initialization
    of (among others) lex->safe_to_cache_query and thd->server_status,
    which are reset respectively in
    - lex_start()
    - mysql_reset_thd_for_next_command()
    So, initializing the lexical analyser *before* using the query cache
    is required for the cache to work properly.
    FIXME: cleanup the dependencies in the code to simplify this.
  */
  lex_start(thd);
  mysql_reset_thd_for_next_command(thd);
5301

5302
  if (query_cache_send_result_to_client(thd, (char*) inBuf, length) <= 0)
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5303
  {
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5304
    LEX *lex= thd->lex;
5305

5306 5307
    sp_cache_flush_obsolete(&thd->sp_proc_cache);
    sp_cache_flush_obsolete(&thd->sp_func_cache);
5308 5309 5310 5311 5312 5313 5314 5315

    Lex_input_stream lip(thd, inBuf, length);
    thd->m_lip= &lip;

    int err= MYSQLparse(thd);
    *found_semicolon= lip.found_semicolon;

    if (!err && ! thd->is_fatal_error)
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5316
    {
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5317
#ifndef NO_EMBEDDED_ACCESS_CHECKS
5318
      if (mqh_used && thd->user_connect &&
5319
	  check_mqh(thd, lex->sql_command))
5320 5321 5322 5323
      {
	thd->net.error = 0;
      }
      else
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5324
#endif
5325
      {
5326
	if (! thd->net.report_error)
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5327
	{
5328 5329 5330 5331 5332 5333 5334 5335 5336 5337
          /*
            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.
          */
5338 5339
          if (lip.found_semicolon &&
              (thd->query_length= (ulong)(lip.found_semicolon - thd->query)))
5340 5341
            thd->query_length--;
          /* Actually execute the query */
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5342
	  mysql_execute_command(thd);
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SCRUM  
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5343
	  query_cache_end_of_result(thd);
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5344
	}
5345
      }
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5346 5347
    }
    else
5348
    {
5349
      DBUG_ASSERT(thd->net.report_error);
5350
      DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
5351
			 thd->is_fatal_error));
5352 5353

      query_cache_abort(&thd->net);
5354
    }
5355 5356 5357 5358 5359 5360
    if (thd->lex->sphead)
    {
      delete thd->lex->sphead;
      thd->lex->sphead= 0;
    }
    lex->unit.cleanup();
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5361
    thd->proc_info="freeing items";
5362
    thd->end_statement();
5363
    thd->cleanup_after_query();
5364
    DBUG_ASSERT(thd->change_list.is_empty());
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5365
  }
5366 5367 5368 5369 5370 5371
  else
  {
    /* There are no multi queries in the cache. */
    *found_semicolon= NULL;
  }

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  DBUG_VOID_RETURN;
}


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5376
#ifdef HAVE_REPLICATION
5377 5378 5379 5380 5381 5382 5383 5384 5385 5386 5387
/*
  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)
{
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5388
  LEX *lex= thd->lex;
5389
  bool error= 0;
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5390
  DBUG_ENTER("mysql_test_parse_for_slave");
5391

5392 5393 5394 5395 5396 5397 5398
  Lex_input_stream lip(thd, inBuf, length);
  thd->m_lip= &lip;
  lex_start(thd);
  mysql_reset_thd_for_next_command(thd);
  int err= MYSQLparse((void*) thd);

  if (!err && ! thd->is_fatal_error &&
5399
      all_tables_not_ok(thd,(TABLE_LIST*) lex->select_lex.table_list.first))
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5400
    error= 1;                  /* Ignore question */
5401
  thd->end_statement();
5402
  thd->cleanup_after_query();
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5403
  DBUG_RETURN(error);
5404
}
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5405
#endif
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5406

5407

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5408

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5409 5410 5411 5412 5413
/*****************************************************************************
** Store field definition for create
** Return 0 if ok
******************************************************************************/

5414
bool add_field_to_list(THD *thd, LEX_STRING *field_name, enum_field_types type,
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5415
		       char *length, char *decimals,
5416
		       uint type_modifier,
5417 5418
		       Item *default_value, Item *on_update_value,
                       LEX_STRING *comment,
5419 5420
		       char *change,
                       List<String> *interval_list, CHARSET_INFO *cs,
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5421
		       uint uint_geom_type)
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5422 5423
{
  register create_field *new_field;
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5424
  LEX  *lex= thd->lex;
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5425 5426
  DBUG_ENTER("add_field_to_list");

5427 5428
  if (check_string_char_length(field_name, "", NAME_CHAR_LEN,
                               system_charset_info, 1))
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5429
  {
5430
    my_error(ER_TOO_LONG_IDENT, MYF(0), field_name->str); /* purecov: inspected */
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5431 5432 5433 5434
    DBUG_RETURN(1);				/* purecov: inspected */
  }
  if (type_modifier & PRI_KEY_FLAG)
  {
5435
    lex->col_list.push_back(new key_part_spec(field_name->str, 0));
5436 5437
    lex->key_list.push_back(new Key(Key::PRIMARY, NullS,
                                    &default_key_create_info,
5438
				    0, lex->col_list));
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5439 5440 5441 5442
    lex->col_list.empty();
  }
  if (type_modifier & (UNIQUE_FLAG | UNIQUE_KEY_FLAG))
  {
5443
    lex->col_list.push_back(new key_part_spec(field_name->str, 0));
5444 5445
    lex->key_list.push_back(new Key(Key::UNIQUE, NullS,
                                    &default_key_create_info, 0,
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5446 5447 5448 5449
				    lex->col_list));
    lex->col_list.empty();
  }

5450
  if (default_value)
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5451
  {
5452
    /* 
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unknown committed
5453 5454
      Default value should be literal => basic constants =>
      no need fix_fields()
5455 5456 5457
      
      We allow only one function as part of default value - 
      NOW() as default for TIMESTAMP type.
5458
    */
5459 5460
    if (default_value->type() == Item::FUNC_ITEM && 
        !(((Item_func*)default_value)->functype() == Item_func::NOW_FUNC &&
5461
         type == MYSQL_TYPE_TIMESTAMP))
5462
    {
5463
      my_error(ER_INVALID_DEFAULT, MYF(0), field_name->str);
5464 5465 5466
      DBUG_RETURN(1);
    }
    else if (default_value->type() == Item::NULL_ITEM)
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5467
    {
5468
      default_value= 0;
5469 5470 5471
      if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) ==
	  NOT_NULL_FLAG)
      {
5472
	my_error(ER_INVALID_DEFAULT, MYF(0), field_name->str);
5473 5474 5475 5476 5477
	DBUG_RETURN(1);
      }
    }
    else if (type_modifier & AUTO_INCREMENT_FLAG)
    {
5478
      my_error(ER_INVALID_DEFAULT, MYF(0), field_name->str);
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5479 5480 5481
      DBUG_RETURN(1);
    }
  }
5482

5483
  if (on_update_value && type != MYSQL_TYPE_TIMESTAMP)
5484
  {
5485
    my_error(ER_INVALID_ON_UPDATE, MYF(0), field_name->str);
5486 5487
    DBUG_RETURN(1);
  }
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5488

5489
  if (type == MYSQL_TYPE_TIMESTAMP && length)
5490 5491 5492 5493 5494
  {
    /* 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.
    */
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5495
    char buf[32];
5496
    my_snprintf(buf, sizeof(buf), "TIMESTAMP(%s)", length);
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5497
    WARN_DEPRECATED(thd, "5.2", buf, "'TIMESTAMP'");
5498 5499
  }

5500
  if (!(new_field= new create_field()) ||
5501
      new_field->init(thd, field_name->str, type, length, decimals, type_modifier,
5502 5503
                      default_value, on_update_value, comment, change,
                      interval_list, cs, uint_geom_type))
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5504
    DBUG_RETURN(1);
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  lex->create_list.push_back(new_field);
  lex->last_field=new_field;
  DBUG_RETURN(0);
}

5511

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/* Store position for column in ALTER TABLE .. ADD column */

void store_position_for_column(const char *name)
{
5516
  current_thd->lex->last_field->after=my_const_cast(char*) (name);
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}

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

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


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


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


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/*
  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
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			TL_OPTION_ALIAS	        an alias in multi table DELETE
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    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,
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					     LEX_STRING *alias,
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					     ulong table_options,
					     thr_lock_type lock_type,
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					     List<index_hint> *index_hints_arg,
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                                             LEX_STRING *option)
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{
  register TABLE_LIST *ptr;
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  TABLE_LIST *previous_table_ref; /* The table preceding the current one. */
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  char *alias_str;
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  LEX *lex= thd->lex;
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  DBUG_ENTER("add_table_to_list");
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  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;
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  if (!test(table_options & TL_OPTION_ALIAS) && 
      check_table_name(table->table.str, table->table.length))
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  {
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    my_error(ER_WRONG_TABLE_NAME, MYF(0), table->table.str);
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    DBUG_RETURN(0);
  }
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  if (table->is_derived_table() == FALSE && table->db.str &&
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      check_db_name(&table->db))
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  {
    my_error(ER_WRONG_DB_NAME, MYF(0), table->db.str);
    DBUG_RETURN(0);
  }
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  if (!alias)					/* Alias is case sensitive */
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  {
    if (table->sel)
    {
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      my_message(ER_DERIVED_MUST_HAVE_ALIAS,
                 ER(ER_DERIVED_MUST_HAVE_ALIAS), MYF(0));
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      DBUG_RETURN(0);
    }
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    if (!(alias_str=thd->memdup(alias_str,table->table.length+1)))
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      DBUG_RETURN(0);
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  }
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  if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
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    DBUG_RETURN(0);				/* purecov: inspected */
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  if (table->db.str)
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  {
    ptr->db= table->db.str;
    ptr->db_length= table->db.length;
  }
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  else if (thd->copy_db_to(&ptr->db, &ptr->db_length))
    DBUG_RETURN(0);
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  ptr->alias= alias_str;
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  if (lower_case_table_names && table->table.length)
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    table->table.length= my_casedn_str(files_charset_info, table->table.str);
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  ptr->table_name=table->table.str;
  ptr->table_name_length=table->table.length;
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  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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  ptr->ignore_leaves= test(table_options & TL_OPTION_IGNORE_LEAVES);
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  ptr->derived=	    table->sel;
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  if (!ptr->derived && !my_strcasecmp(system_charset_info, ptr->db,
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                                      INFORMATION_SCHEMA_NAME.str))
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  {
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    ST_SCHEMA_TABLE *schema_table= find_schema_table(thd, ptr->table_name);
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    if (!schema_table ||
        (schema_table->hidden && 
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         (sql_command_flags[lex->sql_command] & CF_STATUS_COMMAND) == 0))
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    {
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      my_error(ER_UNKNOWN_TABLE, MYF(0),
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               ptr->table_name, INFORMATION_SCHEMA_NAME.str);
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      DBUG_RETURN(0);
    }
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    ptr->schema_table_name= ptr->table_name;
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    ptr->schema_table= schema_table;
  }
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  ptr->select_lex=  lex->current_select;
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  ptr->cacheable_table= 1;
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  ptr->index_hints= index_hints_arg;
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  ptr->option= option ? option->str : 0;
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  /* check that used name is unique */
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  if (lock_type != TL_IGNORE)
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  {
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    TABLE_LIST *first_table= (TABLE_LIST*) table_list.first;
    if (lex->sql_command == SQLCOM_CREATE_VIEW)
      first_table= first_table ? first_table->next_local : NULL;
    for (TABLE_LIST *tables= first_table ;
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	 tables ;
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	 tables=tables->next_local)
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    {
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      if (!my_strcasecmp(table_alias_charset, alias_str, tables->alias) &&
	  !strcmp(ptr->db, tables->db))
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      {
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	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
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      We don't use the offsetof() macro here to avoid warnings from gcc
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    */
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    previous_table_ref= (TABLE_LIST*) ((char*) table_list.next -
                                       ((char*) &(ptr->next_local) -
                                        (char*) ptr));
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    /*
      Set next_name_resolution_table of the previous table reference to point
      to the current table reference. In effect the list
      TABLE_LIST::next_name_resolution_table coincides with
      TABLE_LIST::next_local. Later this may be changed in
      store_top_level_join_columns() for NATURAL/USING joins.
    */
    previous_table_ref->next_name_resolution_table= ptr;
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  }
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  /*
    Link the current table reference in a local list (list for current select).
    Notice that as a side effect here we set the next_local field of the
    previous table reference to 'ptr'. Here we also add one element to the
    list 'table_list'.
  */
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  table_list.link_in_list((byte*) ptr, (byte**) &ptr->next_local);
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  ptr->next_name_resolution_table= NULL;
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  /* Link table in global list (all used tables) */
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  lex->add_to_query_tables(ptr);
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  DBUG_RETURN(ptr);
}

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/*
  Initialize a new table list for a nested join

  SYNOPSIS
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    init_nested_join()
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    thd         current thread
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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");
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  if (!(ptr= (TABLE_LIST*) thd->calloc(ALIGN_SIZE(sizeof(TABLE_LIST))+
                                       sizeof(NESTED_JOIN))))
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    DBUG_RETURN(1);
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  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;
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  ptr->alias= (char*) "(nested_join)";
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  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;
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  NESTED_JOIN *nested_join;
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  DBUG_ENTER("end_nested_join");
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  DBUG_ASSERT(embedding);
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  ptr= embedding;
  join_list= ptr->join_list;
  embedding= ptr->embedding;
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  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;
  }
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  else if (nested_join->join_list.elements == 0)
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  {
    join_list->pop();
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    ptr= 0;                                     // return value
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  }
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  DBUG_RETURN(ptr);
}


/*
  Nest last join operation

  SYNOPSIS
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    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;
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  List<TABLE_LIST> *embedded_list;
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  DBUG_ENTER("nest_last_join");
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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;
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  ptr->alias= (char*) "(nest_last_join)";
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  embedded_list= &nested_join->join_list;
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  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.
      */
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      if (prev_join_using)
        ptr->join_using_fields= prev_join_using;
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    }
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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
*/

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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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/*
  Create a fake SELECT_LEX for a unit

  SYNOPSIS:
    add_fake_select_lex()
    thd			   thread handle

  DESCRIPTION
    The method create a fake SELECT_LEX object for a unit.
    This object is created for any union construct containing a union
    operation and also for any single select union construct of the form
    (SELECT ... ORDER BY order_list [LIMIT n]) ORDER BY ... 
    or of the form
    (SELECT ... ORDER BY LIMIT n) ORDER BY ...
  
  NOTES
    The object is used to retrieve rows from the temporary table
    where the result on the union is obtained.

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

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bool st_select_lex_unit::add_fake_select_lex(THD *thd_arg)
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{
  SELECT_LEX *first_sl= first_select();
  DBUG_ENTER("add_fake_select_lex");
  DBUG_ASSERT(!fake_select_lex);
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  if (!(fake_select_lex= new (thd_arg->mem_root) SELECT_LEX()))
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      DBUG_RETURN(1);
  fake_select_lex->include_standalone(this, 
                                      (SELECT_LEX_NODE**)&fake_select_lex);
  fake_select_lex->select_number= INT_MAX;
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  fake_select_lex->parent_lex= thd_arg->lex; /* Used in init_query. */
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  fake_select_lex->make_empty_select();
  fake_select_lex->linkage= GLOBAL_OPTIONS_TYPE;
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  fake_select_lex->select_limit= 0;

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  fake_select_lex->context.outer_context=first_sl->context.outer_context;
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  /* allow item list resolving in fake select for ORDER BY */
  fake_select_lex->context.resolve_in_select_list= TRUE;
  fake_select_lex->context.select_lex= fake_select_lex;
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  if (!is_union())
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  {
    /* 
      This works only for 
      (SELECT ... ORDER BY list [LIMIT n]) ORDER BY order_list [LIMIT m],
      (SELECT ... LIMIT n) ORDER BY order_list [LIMIT m]
      just before the parser starts processing order_list
    */ 
    global_parameters= fake_select_lex;
    fake_select_lex->no_table_names_allowed= 1;
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    thd_arg->lex->current_select= fake_select_lex;
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  }
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  thd_arg->lex->pop_context();
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  DBUG_RETURN(0);
}

6025

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/*
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  Push a new name resolution context for a JOIN ... ON clause to the
  context stack of a query block.
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  SYNOPSIS
6031
    push_new_name_resolution_context()
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    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,
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    set the first and last leaves of the list of table references
    to be used for name resolution, and push the newly created
    context to the stack of contexts of the query.
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  RETURN
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    FALSE  if all is OK
    TRUE   if a memory allocation error occured
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*/

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bool
push_new_name_resolution_context(THD *thd,
                                 TABLE_LIST *left_op, TABLE_LIST *right_op)
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{
  Name_resolution_context *on_context;
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  if (!(on_context= new (thd->mem_root) Name_resolution_context))
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    return TRUE;
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  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();
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  return thd->lex->push_context(on_context);
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}


/*
  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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{
6081
  if (expr)
6082
  {
6083
    if (!b->on_expr)
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      b->on_expr= expr;
6085 6086
    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);
6093 6094
    }
    b->on_expr->top_level_item();
6095
  }
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}


6099
/*
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  Mark that there is a NATURAL JOIN or JOIN ... USING between two
  tables.
6102 6103 6104

  SYNOPSIS
    add_join_natural()
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    a			Left join argument
    b			Right join argument
    using_fields        Field names from USING clause
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    lex                 The current st_select_lex
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6109
  
6110
  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
6121 6122 6123
    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
6135 6136
*/

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void add_join_natural(TABLE_LIST *a, TABLE_LIST *b, List<String> *using_fields,
                      SELECT_LEX *lex)
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{
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  b->natural_join= a;
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  lex->prev_join_using= using_fields;
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}

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6145
/*
6146 6147 6148 6149
  Reload/resets privileges and the different caches.

  SYNOPSIS
    reload_acl_and_cache()
6150
    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.
6159 6160 6161

  RETURN
    0	 ok
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    !=0  error.  thd->killed or thd->net.report_error is set
6163 6164
*/

6165 6166
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 */
6170
  bool tmp_write_to_binlog= 1;
6171

6172
  DBUG_ASSERT(!thd || !thd->in_sub_stmt);
6173

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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)))
6183 6184
    {
      thd->thread_stack= (char*) &tmp_thd;
6185
      thd->store_globals();
6186
    }
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    if (thd)
    {
      (void)acl_reload(thd);
      (void)grant_reload(thd);
    }
    if (tmp_thd)
    {
      delete tmp_thd;
      /* Remember that we don't have a THD */
      my_pthread_setspecific_ptr(THR_THD,  0);
      thd= 0;
    }
6199
    reset_mqh((LEX_USER *)NULL, TRUE);
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  }
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#endif
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  if (options & REFRESH_LOG)
  {
6204
    /*
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      Flush the normal query log, the update log, the binary log,
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      the slow query log, the relay log (if it exists) and the log
      tables.
6208
    */
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6210
    /*
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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)
6215 6216
    */
    tmp_write_to_binlog= 0;
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    if( mysql_bin_log.is_open() )
    {
      mysql_bin_log.rotate_and_purge(RP_FORCE_ROTATE);
    }
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#ifdef HAVE_REPLICATION
6222
    pthread_mutex_lock(&LOCK_active_mi);
6223
    rotate_relay_log(active_mi);
6224
    pthread_mutex_unlock(&LOCK_active_mi);
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#endif
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    /* flush slow and general logs */
    logger.flush_logs(thd);

    if (ha_flush_logs(NULL))
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      result=1;
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    if (flush_error_log())
      result=1;
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  }
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#ifdef HAVE_QUERY_CACHE
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  if (options & REFRESH_QUERY_CACHE_FREE)
  {
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    query_cache.pack();				// FLUSH QUERY CACHE
6239
    options &= ~REFRESH_QUERY_CACHE;    // Don't flush cache, just free memory
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  }
  if (options & (REFRESH_TABLES | REFRESH_QUERY_CACHE))
  {
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    query_cache.flush();			// RESET QUERY CACHE
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  }
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#endif /*HAVE_QUERY_CACHE*/
6246 6247 6248 6249 6250
  /*
    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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  {
6252
    if ((options & REFRESH_READ_LOCK) && thd)
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    {
6254 6255 6256 6257 6258 6259 6260 6261 6262 6263 6264
      /*
        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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        {
6266 6267 6268 6269 6270
          if ((*lock_p)->type == TL_WRITE)
          {
            my_error(ER_LOCK_OR_ACTIVE_TRANSACTION, MYF(0));
            return 1;
          }
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        }
6272
      }
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      /*
	Writing to the binlog could cause deadlocks, as we don't log
	UNLOCK TABLES
      */
6277
      tmp_write_to_binlog= 0;
6278
      if (lock_global_read_lock(thd))
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	return 1;                               // Killed
6280 6281
      result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1,
                                 tables);
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      if (make_global_read_lock_block_commit(thd)) // Killed
6283 6284 6285 6286 6287
      {
        /* Don't leave things in a half-locked state */
        unlock_global_read_lock(thd);
        return 1;
      }
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    }
6289 6290
    else
      result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1, tables);
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    my_dbopt_cleanup();
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  }
  if (options & REFRESH_HOSTS)
    hostname_cache_refresh();
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  if (thd && (options & REFRESH_STATUS))
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    refresh_status(thd);
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  if (options & REFRESH_THREADS)
    flush_thread_cache();
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#ifdef HAVE_REPLICATION
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  if (options & REFRESH_MASTER)
6301
  {
6302
    DBUG_ASSERT(thd);
6303
    tmp_write_to_binlog= 0;
6304
    if (reset_master(thd))
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    {
6306
      result=1;
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      thd->fatal_error();                       // Ensure client get error
    }
6309
  }
6310
#endif
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#ifdef OPENSSL
6312 6313 6314 6315 6316 6317
   if (options & REFRESH_DES_KEY_FILE)
   {
     if (des_key_file)
       result=load_des_key_file(des_key_file);
   }
#endif
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#ifdef HAVE_REPLICATION
6319 6320
 if (options & REFRESH_SLAVE)
 {
6321
   tmp_write_to_binlog= 0;
6322
   pthread_mutex_lock(&LOCK_active_mi);
6323
   if (reset_slave(thd, active_mi))
6324
     result=1;
6325
   pthread_mutex_unlock(&LOCK_active_mi);
6326
 }
6327
#endif
6328
 if (options & REFRESH_USER_RESOURCES)
6329
   reset_mqh((LEX_USER *) NULL, 0);             /* purecov: inspected */
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 *write_to_binlog= tmp_write_to_binlog;
6331
 return result;
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6332 6333
}

6334

6335
/*
6336
  kills a thread
6337 6338 6339 6340 6341

  SYNOPSIS
    kill_one_thread()
    thd			Thread class
    id			Thread id
6342
    only_kill_query     Should it kill the query or the connection
6343 6344 6345 6346 6347

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

6348
uint kill_one_thread(THD *thd, ulong id, bool only_kill_query)
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6349 6350 6351
{
  THD *tmp;
  uint error=ER_NO_SUCH_THREAD;
6352 6353
  DBUG_ENTER("kill_one_thread");
  DBUG_PRINT("enter", ("id=%lu only_kill=%d", id, only_kill_query));
6354 6355
  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For unlink from list
  I_List_iterator<THD> it(threads);
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  while ((tmp=it++))
  {
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    if (tmp->command == COM_DAEMON)
      continue;
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    if (tmp->thread_id == id)
    {
6362 6363
      pthread_mutex_lock(&tmp->LOCK_delete);	// Lock from delete
      break;
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6364 6365 6366
    }
  }
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
6367 6368
  if (tmp)
  {
6369 6370
    if ((thd->security_ctx->master_access & SUPER_ACL) ||
	!strcmp(thd->security_ctx->user, tmp->security_ctx->user))
6371
    {
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6372
      tmp->awake(only_kill_query ? THD::KILL_QUERY : THD::KILL_CONNECTION);
6373 6374 6375 6376 6377 6378
      error=0;
    }
    else
      error=ER_KILL_DENIED_ERROR;
    pthread_mutex_unlock(&tmp->LOCK_delete);
  }
6379 6380 6381 6382
  DBUG_PRINT("exit", ("%d", error));
  DBUG_RETURN(error);
}

6383

6384 6385 6386 6387 6388 6389 6390 6391 6392 6393 6394 6395 6396 6397
/*
  kills a thread and sends response

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

void sql_kill(THD *thd, ulong id, bool only_kill_query)
{
  uint error;
  if (!(error= kill_one_thread(thd, id, only_kill_query)))
6398
    send_ok(thd);
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  else
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    my_error(error, MYF(0), id);
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}

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6404 6405
	/* If pointer is not a null pointer, append filename to it */

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bool append_file_to_dir(THD *thd, const char **filename_ptr,
                        const char *table_name)
6408
{
6409
  char buff[FN_REFLEN],*ptr, *end;
6410 6411 6412 6413 6414 6415 6416
  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))
  {
6417
    my_error(ER_WRONG_TABLE_NAME, MYF(0), *filename_ptr);
6418 6419 6420 6421
    return 1;
  }
  /* Fix is using unix filename format on dos */
  strmov(buff,*filename_ptr);
6422
  end=convert_dirname(buff, *filename_ptr, NullS);
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  if (!(ptr=thd->alloc((uint) (end-buff)+(uint) strlen(table_name)+1)))
6424 6425
    return 1;					// End of memory
  *filename_ptr=ptr;
6426
  strxmov(ptr,buff,table_name,NullS);
6427 6428
  return 0;
}
6429

6430

6431 6432 6433 6434 6435 6436 6437 6438 6439 6440 6441 6442 6443 6444
/*
  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;
6445 6446
  LEX *lex= thd->lex;
  if (lex->current_select != &lex->select_lex)
6447 6448
  {
    char command[80];
6449 6450 6451
    Lex_input_stream *lip= thd->m_lip;
    strmake(command, lip->yylval->symbol.str,
	    min(lip->yylval->symbol.length, sizeof(command)-1));
6452
    my_error(ER_CANT_USE_OPTION_HERE, MYF(0), command);
6453 6454 6455 6456
    return 1;
  }
  return 0;
}
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6457

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6458

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Comp_creator *comp_eq_creator(bool invert)
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6460
{
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  return invert?(Comp_creator *)&ne_creator:(Comp_creator *)&eq_creator;
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}

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6464

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

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6470

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

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6476

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

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6482

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Comp_creator *comp_lt_creator(bool invert)
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6484
{
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  return invert?(Comp_creator *)&ge_creator:(Comp_creator *)&lt_creator;
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}

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6488

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Comp_creator *comp_ne_creator(bool invert)
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6490
{
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6491
  return invert?(Comp_creator *)&eq_creator:(Comp_creator *)&ne_creator;
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}
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6493 6494 6495 6496 6497 6498 6499 6500 6501 6502 6503 6504 6505 6506 6507 6508 6509 6510 6511 6512


/*
  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)
{
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6513
  if ((cmp == &comp_eq_creator) && !all)       //  = ANY <=> IN
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6514
    return new Item_in_subselect(left_expr, select_lex);
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6515 6516

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

  Item_allany_subselect *it=
6520
    new Item_allany_subselect(left_expr, cmp, select_lex, all);
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6521
  if (all)
6522
    return it->upper_item= new Item_func_not_all(it);	/* ALL */
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6523

6524
  return it->upper_item= new Item_func_nop_all(it);      /* ANY/SOME */
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}
6526 6527


6528 6529 6530 6531 6532 6533 6534 6535 6536 6537 6538 6539
/*
  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.
*/

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6540
bool mysql_create_index(THD *thd, TABLE_LIST *table_list, List<Key> &keys)
6541 6542
{
  List<create_field> fields;
6543 6544
  ALTER_INFO alter_info;
  alter_info.flags= ALTER_ADD_INDEX;
6545 6546 6547
  HA_CREATE_INFO create_info;
  DBUG_ENTER("mysql_create_index");
  bzero((char*) &create_info,sizeof(create_info));
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  create_info.db_type= 0;
6549
  create_info.default_table_charset= thd->variables.collation_database;
6550
  create_info.row_type= ROW_TYPE_NOT_USED;
6551
  DBUG_RETURN(mysql_alter_table(thd,table_list->db,table_list->table_name,
6552
				&create_info, table_list,
6553
				fields, keys, 0, (ORDER*)0,
6554
                                0, &alter_info, 1));
6555 6556 6557
}


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bool mysql_drop_index(THD *thd, TABLE_LIST *table_list, ALTER_INFO *alter_info)
6559 6560 6561 6562 6563 6564
{
  List<create_field> fields;
  List<Key> keys;
  HA_CREATE_INFO create_info;
  DBUG_ENTER("mysql_drop_index");
  bzero((char*) &create_info,sizeof(create_info));
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  create_info.db_type= 0;
6566
  create_info.default_table_charset= thd->variables.collation_database;
6567
  create_info.row_type= ROW_TYPE_NOT_USED;
6568 6569
  alter_info->clear();
  alter_info->flags= ALTER_DROP_INDEX;
6570
  DBUG_RETURN(mysql_alter_table(thd,table_list->db,table_list->table_name,
6571
				&create_info, table_list,
6572
				fields, keys, 0, (ORDER*)0,
6573
                                0, alter_info, 1));
6574
}
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6575 6576


6577 6578 6579 6580 6581
/*
  Multi update query pre-check

  SYNOPSIS
    multi_update_precheck()
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6582
    thd		Thread handler
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VIEW  
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6583
    tables	Global/local table list (have to be the same)
6584

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6585
  RETURN VALUE
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    FALSE OK
    TRUE  Error
6588
*/
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6590
bool multi_update_precheck(THD *thd, TABLE_LIST *tables)
6591 6592 6593 6594 6595
{
  const char *msg= 0;
  TABLE_LIST *table;
  LEX *lex= thd->lex;
  SELECT_LEX *select_lex= &lex->select_lex;
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6596
  DBUG_ENTER("multi_update_precheck");
6597 6598 6599

  if (select_lex->item_list.elements != lex->value_list.elements)
  {
6600
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
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6601
    DBUG_RETURN(TRUE);
6602 6603 6604 6605 6606
  }
  /*
    Ensure that we have UPDATE or SELECT privilege for each table
    The exact privilege is checked in mysql_multi_update()
  */
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VIEW  
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6607
  for (table= tables; table; table= table->next_local)
6608
  {
6609 6610 6611
    if (table->derived)
      table->grant.privilege= SELECT_ACL;
    else if ((check_access(thd, UPDATE_ACL, table->db,
6612 6613
                           &table->grant.privilege, 0, 1,
                           test(table->schema_table)) ||
6614 6615
              grant_option &&
              check_grant(thd, UPDATE_ACL, table, 0, 1, 1)) &&
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6616
             (check_access(thd, SELECT_ACL, table->db,
6617 6618
                           &table->grant.privilege, 0, 0,
                           test(table->schema_table)) ||
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6619
              grant_option && check_grant(thd, SELECT_ACL, table, 0, 1, 0)))
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      DBUG_RETURN(TRUE);
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6621

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VIEW  
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6622
    table->table_in_first_from_clause= 1;
6623
  }
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  /*
    Is there tables of subqueries?
  */
6627
  if (&lex->select_lex != lex->all_selects_list)
6628
  {
6629
    DBUG_PRINT("info",("Checking sub query list"));
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VIEW  
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6630
    for (table= tables; table; table= table->next_global)
6631
    {
6632
      if (!table->table_in_first_from_clause)
6633 6634
      {
	if (check_access(thd, SELECT_ACL, table->db,
6635 6636
			 &table->grant.privilege, 0, 0,
                         test(table->schema_table)) ||
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6637
	    grant_option && check_grant(thd, SELECT_ACL, table, 0, 1, 0))
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	  DBUG_RETURN(TRUE);
6639 6640 6641 6642 6643 6644
      }
    }
  }

  if (select_lex->order_list.elements)
    msg= "ORDER BY";
6645
  else if (select_lex->select_limit)
6646 6647 6648 6649
    msg= "LIMIT";
  if (msg)
  {
    my_error(ER_WRONG_USAGE, MYF(0), "UPDATE", msg);
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6650
    DBUG_RETURN(TRUE);
6651
  }
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6652
  DBUG_RETURN(FALSE);
6653 6654 6655 6656 6657 6658 6659
}

/*
  Multi delete query pre-check

  SYNOPSIS
    multi_delete_precheck()
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6660
    thd			Thread handler
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VIEW  
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6661
    tables		Global/local table list
6662

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  RETURN VALUE
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    FALSE OK
    TRUE  error
6666
*/
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6667

6668
bool multi_delete_precheck(THD *thd, TABLE_LIST *tables)
6669 6670 6671
{
  SELECT_LEX *select_lex= &thd->lex->select_lex;
  TABLE_LIST *aux_tables=
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    (TABLE_LIST *)thd->lex->auxiliary_table_list.first;
6673
  TABLE_LIST **save_query_tables_own_last= thd->lex->query_tables_own_last;
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VIEW  
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6674
  DBUG_ENTER("multi_delete_precheck");
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6676 6677
  /* sql_yacc guarantees that tables and aux_tables are not zero */
  DBUG_ASSERT(aux_tables != 0);
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  if (check_table_access(thd, SELECT_ACL, tables, 0))
6679 6680 6681 6682 6683 6684 6685 6686 6687 6688 6689
    DBUG_RETURN(TRUE);

  /*
    Since aux_tables list is not part of LEX::query_tables list we
    have to juggle with LEX::query_tables_own_last value to be able
    call check_table_access() safely.
  */
  thd->lex->query_tables_own_last= 0;
  if (check_table_access(thd, DELETE_ACL, aux_tables, 0))
  {
    thd->lex->query_tables_own_last= save_query_tables_own_last;
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6690
    DBUG_RETURN(TRUE);
6691 6692 6693
  }
  thd->lex->query_tables_own_last= save_query_tables_own_last;

6694 6695
  if ((thd->options & OPTION_SAFE_UPDATES) && !select_lex->where)
  {
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6696 6697
    my_message(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE,
               ER(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE), MYF(0));
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6698
    DBUG_RETURN(TRUE);
6699
  }
6700 6701 6702 6703 6704 6705 6706 6707 6708 6709 6710 6711 6712 6713 6714 6715 6716 6717 6718 6719 6720 6721 6722 6723 6724
  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;

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6725
  for (target_tbl= (TABLE_LIST *)lex->auxiliary_table_list.first;
6726
       target_tbl; target_tbl= target_tbl->next_local)
6727
  {
6728
    lex->table_count++;
6729 6730
    /* All tables in aux_tables must be found in FROM PART */
    TABLE_LIST *walk;
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VIEW  
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6731
    for (walk= tables; walk; walk= walk->next_local)
6732
    {
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6733 6734 6735
      if (!my_strcasecmp(table_alias_charset,
			 target_tbl->alias, walk->alias) &&
	  !strcmp(walk->db, target_tbl->db))
6736 6737 6738 6739
	break;
    }
    if (!walk)
    {
6740
      my_error(ER_UNKNOWN_TABLE, MYF(0),
6741
               target_tbl->table_name, "MULTI DELETE");
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6742
      DBUG_RETURN(TRUE);
6743
    }
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6744 6745 6746 6747 6748
    if (!walk->derived)
    {
      target_tbl->table_name= walk->table_name;
      target_tbl->table_name_length= walk->table_name_length;
    }
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    walk->updating= target_tbl->updating;
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    walk->lock_type= target_tbl->lock_type;
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VIEW  
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6751
    target_tbl->correspondent_table= walk;	// Remember corresponding table
6752
  }
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6753
  DBUG_RETURN(FALSE);
6754 6755 6756
}


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6757 6758 6759 6760 6761
/*
  simple UPDATE query pre-check

  SYNOPSIS
    update_precheck()
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6762 6763
    thd		Thread handler
    tables	Global table list
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6764 6765

  RETURN VALUE
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6766 6767
    FALSE OK
    TRUE  Error
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6768
*/
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6769

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6770
bool update_precheck(THD *thd, TABLE_LIST *tables)
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6771 6772 6773 6774
{
  DBUG_ENTER("update_precheck");
  if (thd->lex->select_lex.item_list.elements != thd->lex->value_list.elements)
  {
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6775
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
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6776
    DBUG_RETURN(TRUE);
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6777
  }
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6778
  DBUG_RETURN(check_one_table_access(thd, UPDATE_ACL, tables));
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6779 6780 6781 6782 6783 6784 6785 6786
}


/*
  simple DELETE query pre-check

  SYNOPSIS
    delete_precheck()
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6787 6788
    thd		Thread handler
    tables	Global table list
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6789 6790

  RETURN VALUE
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6791 6792
    FALSE  OK
    TRUE   error
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6793
*/
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6794

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6795
bool delete_precheck(THD *thd, TABLE_LIST *tables)
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6796 6797 6798
{
  DBUG_ENTER("delete_precheck");
  if (check_one_table_access(thd, DELETE_ACL, tables))
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6799
    DBUG_RETURN(TRUE);
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6800
  /* Set privilege for the WHERE clause */
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6801
  tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
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6802
  DBUG_RETURN(FALSE);
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6803 6804 6805 6806 6807 6808 6809 6810
}


/*
  simple INSERT query pre-check

  SYNOPSIS
    insert_precheck()
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6811 6812
    thd		Thread handler
    tables	Global table list
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6813 6814

  RETURN VALUE
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6815 6816
    FALSE  OK
    TRUE   error
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6817
*/
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6818

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merge  
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6819
bool insert_precheck(THD *thd, TABLE_LIST *tables)
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{
  LEX *lex= thd->lex;
  DBUG_ENTER("insert_precheck");

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6824 6825 6826 6827
  /*
    Check that we have modify privileges for the first table and
    select privileges for the rest
  */
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6828 6829 6830
  ulong privilege= (INSERT_ACL |
                    (lex->duplicates == DUP_REPLACE ? DELETE_ACL : 0) |
                    (lex->value_list.elements ? UPDATE_ACL : 0));
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6831 6832

  if (check_one_table_access(thd, privilege, tables))
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6833
    DBUG_RETURN(TRUE);
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6834

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6835
  if (lex->update_list.elements != lex->value_list.elements)
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6836
  {
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6837
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
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6838
    DBUG_RETURN(TRUE);
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6839
  }
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6840
  DBUG_RETURN(FALSE);
6841
}
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6842 6843


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6844 6845 6846 6847 6848 6849 6850 6851 6852 6853 6854 6855 6856 6857 6858 6859 6860 6861 6862
/**
    @brief  Check privileges for SHOW CREATE TABLE statement.

    @param  thd    Thread context
    @param  table  Target table

    @retval TRUE  Failure
    @retval FALSE Success
*/

static bool check_show_create_table_access(THD *thd, TABLE_LIST *table)
{
  return check_access(thd, SELECT_ACL | EXTRA_ACL, table->db,
                      &table->grant.privilege, 0, 0,
                      test(table->schema_table)) ||
         grant_option && check_grant(thd, SELECT_ACL, table, 2, UINT_MAX, 0);
}


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6863 6864 6865 6866 6867
/*
  CREATE TABLE query pre-check

  SYNOPSIS
    create_table_precheck()
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6868 6869 6870
    thd			Thread handler
    tables		Global table list
    create_table	Table which will be created
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6871 6872

  RETURN VALUE
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6873 6874
    FALSE   OK
    TRUE   Error
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6875
*/
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6876

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6877 6878
bool create_table_precheck(THD *thd, TABLE_LIST *tables,
                           TABLE_LIST *create_table)
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6879 6880
{
  LEX *lex= thd->lex;
6881 6882
  SELECT_LEX *select_lex= &lex->select_lex;
  ulong want_priv;
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merge  
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6883
  bool error= TRUE;                                 // Error message is given
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6884
  DBUG_ENTER("create_table_precheck");
6885 6886 6887

  want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
              CREATE_TMP_ACL : CREATE_ACL);
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6888 6889
  lex->create_info.alias= create_table->alias;
  if (check_access(thd, want_priv, create_table->db,
6890 6891
		   &create_table->grant.privilege, 0, 0,
                   test(create_table->schema_table)) ||
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6892 6893 6894
      check_merge_table_access(thd, create_table->db,
			       (TABLE_LIST *)
			       lex->create_info.merge_list.first))
6895 6896
    goto err;
  if (grant_option && want_priv != CREATE_TMP_ACL &&
6897
      check_grant(thd, want_priv, create_table, 0, 1, 0))
6898 6899 6900 6901 6902 6903
    goto err;

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

6904 6905
#ifdef NOT_NECESSARY_TO_CHECK_CREATE_TABLE_EXIST_WHEN_PREPARING_STATEMENT
    /* This code throws an ill error for CREATE TABLE t1 SELECT * FROM t1 */
6906
    /*
6907
      Only do the check for PS, because we on execute we have to check that
unknown's avatar
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6908 6909
      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).
6910
    */
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6911
    if (thd->stmt_arena->is_stmt_prepare_or_first_sp_execute())
6912
    {
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6913 6914 6915 6916
      /*
        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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6917
          find_table_in_global_list(tables, create_table->db,
6918
                                    create_table->table_name))
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6919
      {
6920
	error= FALSE;
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6921 6922 6923
        goto err;
      }
    }
6924
#endif
6925 6926 6927
    if (tables && check_table_access(thd, SELECT_ACL, tables,0))
      goto err;
  }
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6928 6929 6930 6931 6932
  else if (lex->create_info.options & HA_LEX_CREATE_TABLE_LIKE)
  {
    if (check_show_create_table_access(thd, tables))
      goto err;
  }
unknown's avatar
merge  
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6933
  error= FALSE;
6934 6935 6936

err:
  DBUG_RETURN(error);
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6937
}
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6938 6939 6940 6941 6942 6943 6944


/*
  negate given expression

  SYNOPSIS
    negate_expression()
6945
    thd  thread handler
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6946 6947 6948 6949 6950 6951 6952 6953 6954 6955 6956 6957 6958 6959 6960 6961 6962 6963 6964 6965 6966 6967 6968 6969 6970 6971 6972 6973
    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);
}
6974

6975 6976
/*
  Set the specified definer to the default value, which is the current user in
6977
  the thread.
6978 6979 6980 6981 6982 6983 6984
 
  SYNOPSIS
    get_default_definer()
    thd       [in] thread handler
    definer   [out] definer
*/
 
6985
void get_default_definer(THD *thd, LEX_USER *definer)
6986 6987 6988 6989 6990 6991 6992 6993 6994 6995
{
  const Security_context *sctx= thd->security_ctx;

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

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

6996

6997
/*
6998
  Create default definer for the specified THD.
6999 7000 7001 7002 7003 7004 7005 7006 7007 7008 7009 7010 7011 7012 7013 7014 7015 7016

  SYNOPSIS
    create_default_definer()
    thd         [in] thread handler

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

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

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

7017
  get_default_definer(thd, definer);
7018 7019 7020 7021 7022

  return definer;
}


7023
/*
7024
  Create definer with the given user and host names.
7025 7026

  SYNOPSIS
7027 7028 7029 7030
    create_definer()
    thd         [in] thread handler
    user_name   [in] user name
    host_name   [in] host name
7031 7032

  RETURN
7033
    On success, return a valid pointer to the created and initialized
7034
    LEX_USER, which contains definer information.
7035
    On error, return 0.
7036 7037
*/

7038
LEX_USER *create_definer(THD *thd, LEX_STRING *user_name, LEX_STRING *host_name)
7039
{
7040 7041 7042 7043
  LEX_USER *definer;

  /* Create and initialize. */

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7044
  if (! (definer= (LEX_USER*) thd->alloc(sizeof(LEX_USER))))
7045 7046 7047 7048 7049 7050
    return 0;

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

  return definer;
7051
}
7052 7053 7054 7055 7056 7057 7058 7059 7060 7061 7062 7063 7064 7065 7066 7067 7068 7069 7070


/*
  Retuns information about user or current user.

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

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

LEX_USER *get_current_user(THD *thd, LEX_USER *user)
{
  if (!user->user.str)  // current_user
7071 7072
    return create_default_definer(thd);

7073 7074
  return user;
}
7075 7076 7077


/*
7078
  Check that byte length of a string does not exceed some limit.
7079 7080

  SYNOPSIS
7081 7082 7083 7084
  check_string_byte_length()
      str              string to be checked
      err_msg          error message to be displayed if the string is too long
      max_byte_length  max length in bytes
7085 7086 7087 7088

  RETURN
    FALSE   the passed string is not longer than max_length
    TRUE    the passed string is longer than max_length
7089 7090 7091

  NOTE
    The function is not used in existing code but can be useful later?
7092 7093
*/

7094 7095
bool check_string_byte_length(LEX_STRING *str, const char *err_msg,
                              uint max_byte_length)
7096
{
7097
  if (str->length <= max_byte_length)
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7098
    return FALSE;
7099

7100 7101 7102 7103 7104 7105 7106 7107 7108 7109 7110 7111 7112 7113 7114 7115 7116 7117 7118 7119 7120 7121 7122 7123 7124 7125 7126 7127 7128 7129 7130 7131
  my_error(ER_WRONG_STRING_LENGTH, MYF(0), str->str, err_msg, max_byte_length);

  return TRUE;
}


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

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

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


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

  if (!well_formed_error &&  str->length == res)
    return FALSE;
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7133 7134
  if (!no_error)
    my_error(ER_WRONG_STRING_LENGTH, MYF(0), str->str, err_msg, max_char_length);
7135 7136
  return TRUE;
}