sql_parse.cc 231 KB
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/* Copyright 2000-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc.
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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; version 2 of the License.
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

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#define MYSQL_LEX 1
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#include "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 "rpl_handler.h"
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#include "sp_head.h"
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#include "sp.h"
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#include "sp_cache.h"
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#include "events.h"
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#include "sql_trigger.h"
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#include "transaction.h"
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#include "sql_audit.h"
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#include "sql_prepare.h"
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#include "probes_mysql.h"
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#include "set_var.h"
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/**
  @defgroup Runtime_Environment Runtime Environment
  @{
*/

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

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

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

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

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

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

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

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

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  DBUG_RETURN(!skip);
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}


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

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

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

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

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

  sql_command_flags[SQLCOM_CREATE_TABLE]=   CF_CHANGES_DATA | CF_REEXECUTION_FRAGILE |
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                                            CF_AUTO_COMMIT_TRANS | CF_PROTECT_AGAINST_GRL;
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  sql_command_flags[SQLCOM_CREATE_INDEX]=   CF_CHANGES_DATA | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_ALTER_TABLE]=    CF_CHANGES_DATA | CF_WRITE_LOGS_COMMAND |
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                                            CF_AUTO_COMMIT_TRANS | CF_PROTECT_AGAINST_GRL;
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  sql_command_flags[SQLCOM_TRUNCATE]=       CF_CHANGES_DATA | CF_WRITE_LOGS_COMMAND |
                                            CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_DROP_TABLE]=     CF_CHANGES_DATA | CF_AUTO_COMMIT_TRANS;
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  sql_command_flags[SQLCOM_LOAD]=           CF_CHANGES_DATA | CF_REEXECUTION_FRAGILE |
                                            CF_PROTECT_AGAINST_GRL;
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  sql_command_flags[SQLCOM_CREATE_DB]=      CF_CHANGES_DATA | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_DROP_DB]=        CF_CHANGES_DATA | CF_AUTO_COMMIT_TRANS;
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  sql_command_flags[SQLCOM_ALTER_DB_UPGRADE]= CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_ALTER_DB]=       CF_CHANGES_DATA | CF_AUTO_COMMIT_TRANS;
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  sql_command_flags[SQLCOM_RENAME_TABLE]=   CF_CHANGES_DATA | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_DROP_INDEX]=     CF_CHANGES_DATA | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_CREATE_VIEW]=    CF_CHANGES_DATA | CF_REEXECUTION_FRAGILE |
                                            CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_DROP_VIEW]=      CF_CHANGES_DATA | CF_AUTO_COMMIT_TRANS;
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  sql_command_flags[SQLCOM_CREATE_TRIGGER]= CF_CHANGES_DATA | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_DROP_TRIGGER]=   CF_CHANGES_DATA | CF_AUTO_COMMIT_TRANS;
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  sql_command_flags[SQLCOM_CREATE_EVENT]=   CF_CHANGES_DATA | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_ALTER_EVENT]=    CF_CHANGES_DATA | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_DROP_EVENT]=     CF_CHANGES_DATA | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_CREATE_TRIGGER]= CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_DROP_TRIGGER]=   CF_AUTO_COMMIT_TRANS;
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  sql_command_flags[SQLCOM_UPDATE]=	    CF_CHANGES_DATA | CF_HAS_ROW_COUNT |
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                                            CF_REEXECUTION_FRAGILE | CF_PROTECT_AGAINST_GRL;
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  sql_command_flags[SQLCOM_UPDATE_MULTI]=   CF_CHANGES_DATA | CF_HAS_ROW_COUNT |
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                                            CF_REEXECUTION_FRAGILE | CF_PROTECT_AGAINST_GRL;
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  sql_command_flags[SQLCOM_INSERT]=	    CF_CHANGES_DATA | CF_HAS_ROW_COUNT |
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                                            CF_REEXECUTION_FRAGILE | CF_PROTECT_AGAINST_GRL;
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  sql_command_flags[SQLCOM_INSERT_SELECT]=  CF_CHANGES_DATA | CF_HAS_ROW_COUNT |
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                                            CF_REEXECUTION_FRAGILE | CF_PROTECT_AGAINST_GRL;
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  sql_command_flags[SQLCOM_DELETE]=         CF_CHANGES_DATA | CF_HAS_ROW_COUNT |
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                                            CF_REEXECUTION_FRAGILE | CF_PROTECT_AGAINST_GRL;
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  sql_command_flags[SQLCOM_DELETE_MULTI]=   CF_CHANGES_DATA | CF_HAS_ROW_COUNT |
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                                            CF_REEXECUTION_FRAGILE | CF_PROTECT_AGAINST_GRL;
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  sql_command_flags[SQLCOM_REPLACE]=        CF_CHANGES_DATA | CF_HAS_ROW_COUNT |
                                            CF_REEXECUTION_FRAGILE;
  sql_command_flags[SQLCOM_REPLACE_SELECT]= CF_CHANGES_DATA | CF_HAS_ROW_COUNT |
                                            CF_REEXECUTION_FRAGILE;
  sql_command_flags[SQLCOM_SELECT]=         CF_REEXECUTION_FRAGILE;
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  sql_command_flags[SQLCOM_SET_OPTION]=     CF_REEXECUTION_FRAGILE | CF_AUTO_COMMIT_TRANS;
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  sql_command_flags[SQLCOM_DO]=             CF_REEXECUTION_FRAGILE;

  sql_command_flags[SQLCOM_SHOW_STATUS_PROC]= CF_STATUS_COMMAND | CF_REEXECUTION_FRAGILE;
  sql_command_flags[SQLCOM_SHOW_STATUS]=      CF_STATUS_COMMAND | CF_REEXECUTION_FRAGILE;
  sql_command_flags[SQLCOM_SHOW_DATABASES]=   CF_STATUS_COMMAND | CF_REEXECUTION_FRAGILE;
  sql_command_flags[SQLCOM_SHOW_TRIGGERS]=    CF_STATUS_COMMAND | CF_REEXECUTION_FRAGILE;
  sql_command_flags[SQLCOM_SHOW_EVENTS]=      CF_STATUS_COMMAND | CF_REEXECUTION_FRAGILE;
  sql_command_flags[SQLCOM_SHOW_OPEN_TABLES]= CF_STATUS_COMMAND | CF_REEXECUTION_FRAGILE;
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  sql_command_flags[SQLCOM_SHOW_PLUGINS]=     CF_STATUS_COMMAND;
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  sql_command_flags[SQLCOM_SHOW_FIELDS]=      CF_STATUS_COMMAND | CF_REEXECUTION_FRAGILE;
  sql_command_flags[SQLCOM_SHOW_KEYS]=        CF_STATUS_COMMAND | CF_REEXECUTION_FRAGILE;
  sql_command_flags[SQLCOM_SHOW_VARIABLES]=   CF_STATUS_COMMAND | CF_REEXECUTION_FRAGILE;
  sql_command_flags[SQLCOM_SHOW_CHARSETS]=    CF_STATUS_COMMAND | CF_REEXECUTION_FRAGILE;
  sql_command_flags[SQLCOM_SHOW_COLLATIONS]=  CF_STATUS_COMMAND | CF_REEXECUTION_FRAGILE;
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  sql_command_flags[SQLCOM_SHOW_NEW_MASTER]=  CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_BINLOGS]=     CF_STATUS_COMMAND;
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  sql_command_flags[SQLCOM_SHOW_SLAVE_HOSTS]= CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_BINLOG_EVENTS]= CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_STORAGE_ENGINES]= CF_STATUS_COMMAND;
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  sql_command_flags[SQLCOM_SHOW_AUTHORS]=     CF_STATUS_COMMAND;
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  sql_command_flags[SQLCOM_SHOW_CONTRIBUTORS]= CF_STATUS_COMMAND;
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  sql_command_flags[SQLCOM_SHOW_PRIVILEGES]=  CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_WARNS]=       CF_STATUS_COMMAND | CF_DIAGNOSTIC_STMT;
  sql_command_flags[SQLCOM_SHOW_ERRORS]=      CF_STATUS_COMMAND | CF_DIAGNOSTIC_STMT;
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  sql_command_flags[SQLCOM_SHOW_ENGINE_STATUS]= CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_ENGINE_MUTEX]= CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_ENGINE_LOGS]= CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_PROCESSLIST]= CF_STATUS_COMMAND;
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  sql_command_flags[SQLCOM_SHOW_GRANTS]=      CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_CREATE_DB]=   CF_STATUS_COMMAND;
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  sql_command_flags[SQLCOM_SHOW_CREATE]=  CF_STATUS_COMMAND;
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  sql_command_flags[SQLCOM_SHOW_MASTER_STAT]= CF_STATUS_COMMAND;
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  sql_command_flags[SQLCOM_SHOW_SLAVE_STAT]=  CF_STATUS_COMMAND;
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  sql_command_flags[SQLCOM_SHOW_CREATE_PROC]= CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_CREATE_FUNC]= CF_STATUS_COMMAND;
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  sql_command_flags[SQLCOM_SHOW_CREATE_TRIGGER]=  CF_STATUS_COMMAND;
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  sql_command_flags[SQLCOM_SHOW_STATUS_FUNC]= CF_STATUS_COMMAND | CF_REEXECUTION_FRAGILE;
  sql_command_flags[SQLCOM_SHOW_PROC_CODE]=   CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_FUNC_CODE]=   CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_CREATE_EVENT]= CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_PROFILES]=    CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_PROFILE]=     CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_BINLOG_BASE64_EVENT]= CF_STATUS_COMMAND;
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   sql_command_flags[SQLCOM_SHOW_TABLES]=       (CF_STATUS_COMMAND |
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                                                 CF_SHOW_TABLE_COMMAND |
                                                 CF_REEXECUTION_FRAGILE);
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  sql_command_flags[SQLCOM_SHOW_TABLE_STATUS]= (CF_STATUS_COMMAND |
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                                                CF_SHOW_TABLE_COMMAND |
                                                CF_REEXECUTION_FRAGILE);
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  sql_command_flags[SQLCOM_CREATE_USER]=       CF_CHANGES_DATA | CF_PROTECT_AGAINST_GRL;
  sql_command_flags[SQLCOM_RENAME_USER]=       CF_CHANGES_DATA | CF_PROTECT_AGAINST_GRL;
  sql_command_flags[SQLCOM_DROP_USER]=         CF_CHANGES_DATA | CF_PROTECT_AGAINST_GRL;
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  sql_command_flags[SQLCOM_GRANT]=             CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_REVOKE]=            CF_CHANGES_DATA;
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  sql_command_flags[SQLCOM_REVOKE_ALL]=        CF_PROTECT_AGAINST_GRL;
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  sql_command_flags[SQLCOM_OPTIMIZE]=          CF_CHANGES_DATA;
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  sql_command_flags[SQLCOM_CREATE_FUNCTION]=   CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_CREATE_PROCEDURE]=  CF_CHANGES_DATA | CF_PROTECT_AGAINST_GRL | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_CREATE_SPFUNCTION]= CF_CHANGES_DATA | CF_PROTECT_AGAINST_GRL | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_DROP_PROCEDURE]=    CF_CHANGES_DATA | CF_PROTECT_AGAINST_GRL | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_DROP_FUNCTION]=     CF_CHANGES_DATA | CF_PROTECT_AGAINST_GRL | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_ALTER_PROCEDURE]=   CF_CHANGES_DATA | CF_PROTECT_AGAINST_GRL | CF_AUTO_COMMIT_TRANS;
  sql_command_flags[SQLCOM_ALTER_FUNCTION]=    CF_CHANGES_DATA | CF_PROTECT_AGAINST_GRL | CF_AUTO_COMMIT_TRANS;
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  sql_command_flags[SQLCOM_INSTALL_PLUGIN]=    CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_UNINSTALL_PLUGIN]=  CF_CHANGES_DATA;

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

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

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

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

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

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

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  thd_proc_info(thd, "Execution of init_command");
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  save_client_capabilities= thd->client_capabilities;
  thd->client_capabilities|= CLIENT_MULTI_QUERIES;
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  /*
    We don't need return result of execution to client side.
    To forbid this we should set thd->net.vio to 0.
  */
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  save_vio= thd->net.vio;
  thd->net.vio= 0;
385
  dispatch_command(COM_QUERY, thd, buf, len);
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  thd->client_capabilities= save_client_capabilities;
  thd->net.vio= save_vio;
388

389
#if defined(ENABLED_PROFILING)
390 391
  thd->profiling.finish_current_query();
#endif
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}


395
static void handle_bootstrap_impl(THD *thd)
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{
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  MYSQL_FILE *file= bootstrap_file;
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  char *buff;
399
  const char* found_semicolon= NULL;
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  DBUG_ENTER("handle_bootstrap");

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#ifndef EMBEDDED_LIBRARY
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  pthread_detach_this_thread();
  thd->thread_stack= (char*) &thd;
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#endif /* EMBEDDED_LIBRARY */
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  thd_proc_info(thd, 0);
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  thd->version=refresh_version;
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  thd->security_ctx->priv_user=
    thd->security_ctx->user= (char*) my_strdup("boot", MYF(MY_WME));
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  thd->security_ctx->priv_host[0]=0;
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  /*
    Make the "client" handle multiple results. This is necessary
    to enable stored procedures with SELECTs and Dynamic SQL
    in init-file.
  */
  thd->client_capabilities|= CLIENT_MULTI_RESULTS;
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  buff= (char*) thd->net.buff;
421
  thd->init_for_queries();
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  while (mysql_file_fgets(buff, thd->net.max_packet, file))
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  {
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    char *query;
    /* strlen() can't be deleted because mysql_file_fgets() doesn't return length */
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    ulong length= (ulong) strlen(buff);
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    while (buff[length-1] != '\n' && !mysql_file_feof(file))
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    {
      /*
        We got only a part of the current string. Will try to increase
        net buffer then read the rest of the current string.
      */
      /* purecov: begin tested */
      if (net_realloc(&(thd->net), 2 * thd->net.max_packet))
      {
436
        thd->protocol->end_statement();
437
        bootstrap_error= 1;
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        break;
      }
      buff= (char*) thd->net.buff;
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      mysql_file_fgets(buff + length, thd->net.max_packet - length, file);
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      length+= (ulong) strlen(buff + length);
      /* purecov: end */
    }
445
    if (bootstrap_error)
446
      break;                                    /* purecov: inspected */
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447

448
    while (length && (my_isspace(thd->charset(), buff[length-1]) ||
449
                      buff[length-1] == ';'))
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      length--;
    buff[length]=0;
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    /* Skip lines starting with delimiter */
    if (strncmp(buff, STRING_WITH_LEN("delimiter")) == 0)
      continue;

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    query= (char *) thd->memdup_w_gap(buff, length + 1,
                                      thd->db_length + 1 +
                                      QUERY_CACHE_FLAGS_SIZE);
460
    thd->set_query_and_id(query, length, next_query_id());
461
    DBUG_PRINT("query",("%-.4096s",thd->query()));
462
#if defined(ENABLED_PROFILING)
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    thd->profiling.start_new_query();
464
    thd->profiling.set_query_source(thd->query(), length);
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#endif

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    /*
      We don't need to obtain LOCK_thread_count here because in bootstrap
      mode we have only one thread.
    */
471
    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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    bootstrap_error= thd->is_error();
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    thd->protocol->end_statement();
477

478
#if defined(ENABLED_PROFILING)
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    thd->profiling.finish_current_query();
#endif

482
    if (bootstrap_error)
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      break;

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


/**
  Execute commands from bootstrap_file.

  Used when creating the initial grant tables.
*/

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

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  mysql_thread_set_psi_id(thd->thread_id);

  do_handle_bootstrap(thd);
  return 0;
}

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

  handle_bootstrap_impl(thd);

524
end:
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  net_end(&thd->net);
  thd->cleanup();
  delete thd;

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#ifndef EMBEDDED_LIBRARY
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  mysql_mutex_lock(&LOCK_thread_count);
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  thread_count--;
532
  in_bootstrap= FALSE;
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  mysql_cond_broadcast(&COND_thread_count);
  mysql_mutex_unlock(&LOCK_thread_count);
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  my_thread_end();
  pthread_exit(0);
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#endif
538

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  return;
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}


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

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

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

  @detail
    This function is used for write access to MERGE tables only
    (CREATE TABLE, ALTER TABLE ... UNION=(...)). Set TL_WRITE for
    every child. Set 'db' for every child if not present.
*/
560
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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static bool check_merge_table_access(THD *thd, char *db,
                                     TABLE_LIST *table_list)
{
  int error= 0;

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

    for (tlist= table_list; tlist; tlist= tlist->next_local)
    {
      if (!tlist->db || !tlist->db[0])
        tlist->db= db; /* purecov: inspected */
    }
    error= check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
577
                              table_list, FALSE, UINT_MAX, FALSE);
578 579 580
  }
  return error;
}
581
#endif
582

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

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

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/**
   This works because items are allocated with sql_alloc().
   @note The function also handles null pointers (empty list).
*/
601 602
void cleanup_items(Item *item)
{
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603
  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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}

609
#ifndef EMBEDDED_LIBRARY
610

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/**
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  Read one command from connection and execute it (query or simple command).
613
  This function is called in loop from thread function.
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  For profiling to work, it must never be called recursively.

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  @retval
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    0  success
619
  @retval
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    1  request of thread shutdown (see dispatch_command() description)
*/

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bool do_command(THD *thd)
{
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  bool return_value;
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  char *packet= 0;
627
  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)
  */
636
  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"
642
    number of seconds has passed.
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  */
644
  my_net_set_read_timeout(net, thd->variables.net_wait_timeout);
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  /*
    XXX: this code is here only to clear possible errors of init_connect. 
    Consider moving to init_connect() instead.
  */
650
  thd->clear_error();				// Clear error message
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  thd->stmt_da->reset_diagnostics_area();
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  net_new_transaction(net);
654

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  if ((packet_length= my_net_read(net)) == packet_error)
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  {
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    DBUG_PRINT("info",("Got error %d reading command from socket %s",
		       net->error,
		       vio_description(net->vio)));
660

661
    /* Check if we can continue without closing the connection */
662

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    /* The error must be set. */
    DBUG_ASSERT(thd->is_error());
665
    thd->protocol->end_statement();
666

667
    if (net->error != 3)
668
    {
669
      return_value= TRUE;                       // We have to close it.
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      goto out;
    }
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673
    net->error= 0;
674 675
    return_value= FALSE;
    goto out;
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  }
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  packet= (char*) net->read_pos;
  /*
    'packet_length' contains length of data, as it was stored in packet
    header. In case of malformed header, my_net_read returns zero.
    If packet_length is not zero, my_net_read ensures that the returned
    number of bytes was actually read from network.
    There is also an extra safety measure in my_net_read:
    it sets packet[packet_length]= 0, but only for non-zero packets.
  */
  if (packet_length == 0)                       /* safety */
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  {
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    /* Initialize with COM_SLEEP packet */
    packet[0]= (uchar) COM_SLEEP;
    packet_length= 1;
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  }
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  /* Do not rely on my_net_read, extra safety against programming errors. */
  packet[packet_length]= '\0';                  /* safety */

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

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

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

out:
  DBUG_RETURN(return_value);
713
}
714
#endif  /* EMBEDDED_LIBRARY */
715

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/**
  @brief Determine if an attempt to update a non-temporary table while the
    read-only option was enabled has been made.

  This is a helper function to mysql_execute_command.

  @note SQLCOM_MULTI_UPDATE is an exception and delt with elsewhere.

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

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

  if (!opt_readonly)
    DBUG_RETURN(FALSE);

  LEX *lex= thd->lex;

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

  if (user_is_super)
    DBUG_RETURN(FALSE);

747
  if (!(sql_command_flags[lex->sql_command] & CF_CHANGES_DATA))
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    DBUG_RETURN(FALSE);

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

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

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

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


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

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


  /* Assuming that only temporary tables are modified. */
  DBUG_RETURN(FALSE);
}
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784 785
/**
  Perform one connection-level (COM_XXXX) command.
786

787 788 789 790 791 792 793 794
  @param command         type of command to perform
  @param thd             connection handle
  @param packet          data for the command, packet is always null-terminated
  @param packet_length   length of packet + 1 (to show that data is
                         null-terminated) except for COM_SLEEP, where it
                         can be zero.

  @todo
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    set thd->lex->sql_command to SQLCOM_END here.
  @todo
    The following has to be changed to an 8 byte integer
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  @retval
800
    0   ok
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  @retval
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    1   request of thread shutdown, i. e. if command is
        COM_QUIT/COM_SHUTDOWN
*/
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bool dispatch_command(enum enum_server_command command, THD *thd,
		      char* packet, uint packet_length)
{
  NET *net= &thd->net;
809
  bool error= 0;
810
  DBUG_ENTER("dispatch_command");
811
  DBUG_PRINT("info",("packet: '%*.s'; command: %d", packet_length, packet, command));
812

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#if defined(ENABLED_PROFILING)
  thd->profiling.start_new_query();
#endif
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  MYSQL_COMMAND_START(thd->thread_id, command,
                      thd->security_ctx->priv_user,
                      (char *) thd->security_ctx->host_or_ip);
  
820
  thd->command=command;
821
  /*
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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.
824
  */
825
  thd->enable_slow_log= TRUE;
826
  thd->lex->sql_command= SQLCOM_END; /* to avoid confusing VIEW detectors */
827
  thd->set_time();
828
  thd->set_query_id(get_query_id());
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  if (!(server_command_flags[command] & CF_SKIP_QUERY_ID))
830
    next_query_id();
831
  inc_thread_running();
832

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  if (!(server_command_flags[command] & CF_SKIP_QUESTIONS))
    statistic_increment(thd->status_var.questions, &LOCK_status);

836 837 838 839 840
  /**
    Clear the set of flags that are expected to be cleared at the
    beginning of each command.
  */
  thd->server_status&= ~SERVER_STATUS_CLEAR_SET;
841
  switch (command) {
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842
  case COM_INIT_DB:
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  {
    LEX_STRING tmp;
845
    status_var_increment(thd->status_var.com_stat[SQLCOM_CHANGE_DB]);
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    thd->convert_string(&tmp, system_charset_info,
847
			packet, packet_length, thd->charset());
848
    if (!mysql_change_db(thd, &tmp, FALSE))
849
    {
850
      general_log_write(thd, command, thd->db, thd->db_length);
851
      my_ok(thd);
852
    }
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853 854
    break;
  }
855
#ifdef HAVE_REPLICATION
856 857
  case COM_REGISTER_SLAVE:
  {
858
    if (!register_slave(thd, (uchar*)packet, packet_length))
859
      my_ok(thd);
860 861
    break;
  }
862
#endif
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  case COM_CHANGE_USER:
  {
865
    status_var_increment(thd->status_var.com_other);
866 867
    char *user= (char*) packet, *packet_end= packet + packet_length;
    /* Safe because there is always a trailing \0 at the end of the packet */
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    char *passwd= strend(user)+1;

870
    thd->change_user();
871
    thd->clear_error();                         // if errors from rollback
872

873
    /*
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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).
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      Cast *passwd to an unsigned char, so that it doesn't extend the sign
      for *passwd > 127 and become 2**32-127 after casting to uint.
880
    */
881
    char db_buff[NAME_LEN+1];                 // buffer to store db in utf8
882
    char *db= passwd;
883
    char *save_db;
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    /*
      If there is no password supplied, the packet must contain '\0',
      in any type of handshake (4.1 or pre-4.1).
     */
    if (passwd >= packet_end)
    {
      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
      break;
    }
893
    uint passwd_len= (thd->client_capabilities & CLIENT_SECURE_CONNECTION ?
894
                      (uchar)(*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;

900
    db+= passwd_len + 1;
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    /*
      Database name is always NUL-terminated, so in case of empty database
      the packet must contain at least the trailing '\0'.
    */
    if (db >= packet_end)
906
    {
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907
      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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      break;
    }
910 911
    db_length= strlen(db);

912
    char *ptr= db + db_length + 1;
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    uint cs_number= 0;

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    if (ptr < packet_end)
    {
      if (ptr + 2 > packet_end)
      {
        my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
        break;
      }

      cs_number= uint2korr(ptr);
    }
925

926
    /* Convert database name to utf8 */
927
    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
928
                             system_charset_info, db, db_length,
929
                             thd->charset(), &dummy_errors)]= 0;
930
    db= db_buff;
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931

932
    /* Save user and privileges */
933 934 935
    save_db_length= thd->db_length;
    save_db= thd->db;
    save_user_connect= thd->user_connect;
936 937

    if (!(thd->security_ctx->user= my_strdup(user, MYF(0))))
938
    {
939
      thd->security_ctx->user= save_security_ctx.user;
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940
      my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
941 942
      break;
    }
peter@mysql.com's avatar
peter@mysql.com committed
943

944 945
    /* Clear variables that are allocated */
    thd->user_connect= 0;
946
    thd->security_ctx->priv_user= thd->security_ctx->user;
947
    res= check_user(thd, COM_CHANGE_USER, passwd, passwd_len, db, FALSE);
peter@mysql.com's avatar
peter@mysql.com committed
948

949 950
    if (res)
    {
951 952
      x_free(thd->security_ctx->user);
      *thd->security_ctx= save_security_ctx;
953
      thd->user_connect= save_user_connect;
954 955 956 957 958
      thd->db= save_db;
      thd->db_length= save_db_length;
    }
    else
    {
959
#ifndef NO_EMBEDDED_ACCESS_CHECKS
960
      /* we've authenticated new user */
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
961 962
      if (save_user_connect)
	decrease_user_connections(save_user_connect);
963
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
964 965
      x_free(save_db);
      x_free(save_security_ctx.user);
966 967 968 969 970 971

      if (cs_number)
      {
        thd_init_client_charset(thd, cs_number);
        thd->update_charset();
      }
972
    }
bk@work.mysql.com's avatar
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973 974
    break;
  }
975
  case COM_STMT_EXECUTE:
976
  {
977
    mysqld_stmt_execute(thd, packet, packet_length);
978 979
    break;
  }
980
  case COM_STMT_FETCH:
981
  {
982
    mysqld_stmt_fetch(thd, packet, packet_length);
983 984
    break;
  }
985
  case COM_STMT_SEND_LONG_DATA:
986
  {
987
    mysql_stmt_get_longdata(thd, packet, packet_length);
988 989
    break;
  }
990
  case COM_STMT_PREPARE:
991
  {
992
    mysqld_stmt_prepare(thd, packet, packet_length);
993 994
    break;
  }
995
  case COM_STMT_CLOSE:
996
  {
997
    mysqld_stmt_close(thd, packet);
998 999
    break;
  }
1000
  case COM_STMT_RESET:
1001
  {
1002
    mysqld_stmt_reset(thd, packet);
1003 1004
    break;
  }
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1005 1006
  case COM_QUERY:
  {
1007 1008
    if (alloc_query(thd, packet, packet_length))
      break;					// fatal error is set
1009
    MYSQL_QUERY_START(thd->query(), thd->thread_id,
1010 1011 1012
                      (char *) (thd->db ? thd->db : ""),
                      thd->security_ctx->priv_user,
                      (char *) thd->security_ctx->host_or_ip);
1013
    char *packet_end= thd->query() + thd->query_length();
1014
    /* 'b' stands for 'buffer' parameter', special for 'my_snprintf' */
1015
    const char* end_of_stmt= NULL;
1016

1017 1018
    general_log_write(thd, command, thd->query(), thd->query_length());
    DBUG_PRINT("query",("%-.4096s",thd->query()));
1019
#if defined(ENABLED_PROFILING)
1020
    thd->profiling.set_query_source(thd->query(), thd->query_length());
1021
#endif
1022

1023
    mysql_parse(thd, thd->query(), thd->query_length(), &end_of_stmt);
1024

1025
    while (!thd->killed && (end_of_stmt != NULL) && ! thd->is_error())
1026
    {
1027
      char *beginning_of_next_stmt= (char*) end_of_stmt;
1028

1029
      thd->protocol->end_statement();
1030
      query_cache_end_of_result(thd);
1031
      /*
1032 1033
        Multiple queries exits, execute them individually
      */
1034
      close_thread_tables(thd);
1035
      ulong length= (ulong)(packet_end - beginning_of_next_stmt);
1036

1037
      log_slow_statement(thd);
1038

1039
      /* Remove garbage at start of query */
1040
      while (length > 0 && my_isspace(thd->charset(), *beginning_of_next_stmt))
1041
      {
1042
        beginning_of_next_stmt++;
1043 1044
        length--;
      }
1045

1046 1047 1048 1049 1050
      if (MYSQL_QUERY_DONE_ENABLED())
      {
        MYSQL_QUERY_DONE(thd->is_error());
      }

1051
#if defined(ENABLED_PROFILING)
1052 1053 1054 1055 1056
      thd->profiling.finish_current_query();
      thd->profiling.start_new_query("continuing");
      thd->profiling.set_query_source(beginning_of_next_stmt, length);
#endif

1057
      MYSQL_QUERY_START(beginning_of_next_stmt, thd->thread_id,
1058 1059 1060 1061
                        (char *) (thd->db ? thd->db : ""),
                        thd->security_ctx->priv_user,
                        (char *) thd->security_ctx->host_or_ip);

1062
      thd->set_query_and_id(beginning_of_next_stmt, length, next_query_id());
1063 1064 1065 1066
      /*
        Count each statement from the client.
      */
      statistic_increment(thd->status_var.questions, &LOCK_status);
1067
      thd->set_time(); /* Reset the query start time. */
1068
      /* TODO: set thd->lex->sql_command to SQLCOM_END here */
1069
      mysql_parse(thd, beginning_of_next_stmt, length, &end_of_stmt);
1070 1071
    }

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1072 1073 1074
    DBUG_PRINT("info",("query ready"));
    break;
  }
1075
  case COM_FIELD_LIST:				// This isn't actually needed
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1076
#ifdef DONT_ALLOW_SHOW_COMMANDS
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1077 1078
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0));	/* purecov: inspected */
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bk@work.mysql.com committed
1079 1080 1081
    break;
#else
  {
1082
    char *fields, *packet_end= packet + packet_length, *arg_end;
1083
    /* Locked closure of all tables */
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1084
    TABLE_LIST table_list;
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1085
    LEX_STRING conv_name;
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cmiller@zippy.(none) committed
1086

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bell@sanja.is.com.ua committed
1087
    /* used as fields initializator */
1088
    lex_start(thd);
1089

1090
    status_var_increment(thd->status_var.com_stat[SQLCOM_SHOW_FIELDS]);
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1091
    bzero((char*) &table_list,sizeof(table_list));
1092
    if (thd->copy_db_to(&table_list.db, &table_list.db_length))
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bk@work.mysql.com committed
1093
      break;
1094 1095 1096 1097
    /*
      We have name + wildcard in packet, separated by endzero
    */
    arg_end= strend(packet);
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
1098
    thd->convert_string(&conv_name, system_charset_info,
1099
			packet, (uint) (arg_end - packet), thd->charset());
1100
    table_list.alias= table_list.table_name= conv_name.str;
1101
    packet= arg_end + 1;
1102

1103
    if (is_infoschema_db(table_list.db, table_list.db_length))
1104 1105 1106 1107 1108 1109
    {
      ST_SCHEMA_TABLE *schema_table= find_schema_table(thd, table_list.alias);
      if (schema_table)
        table_list.schema_table= schema_table;
    }

Gleb Shchepa's avatar
Gleb Shchepa committed
1110 1111
    uint query_length= (uint) (packet_end - packet); // Don't count end \0
    if (!(fields= (char *) thd->memdup(packet, query_length + 1)))
1112
      break;
1113
    thd->set_query(fields, query_length);
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cmiller@zippy.(none) committed
1114
    general_log_print(thd, command, "%s %s", table_list.table_name, fields);
1115
    if (lower_case_table_names)
1116
      my_casedn_str(files_charset_info, table_list.table_name);
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1117

Marc Alff's avatar
Marc Alff committed
1118 1119 1120 1121
    if (check_access(thd, SELECT_ACL, table_list.db,
                     &table_list.grant.privilege,
                     &table_list.grant.m_internal,
                     0, 0))
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1122
      break;
1123
    if (check_grant(thd, SELECT_ACL, &table_list, TRUE, UINT_MAX, FALSE))
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1124
      break;
1125 1126
    /* init structures for VIEW processing */
    table_list.select_lex= &(thd->lex->select_lex);
1127 1128 1129 1130

    lex_start(thd);
    mysql_reset_thd_for_next_command(thd);

1131
    thd->lex->
1132 1133
      select_lex.table_list.link_in_list((uchar*) &table_list,
                                         (uchar**) &table_list.next_local);
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1134
    thd->lex->add_to_query_tables(&table_list);
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1135
    init_mdl_requests(&table_list);
1136

1137 1138
    /* switch on VIEW optimisation: do not fill temporary tables */
    thd->lex->sql_command= SQLCOM_SHOW_FIELDS;
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1139
    mysqld_list_fields(thd,&table_list,fields);
1140
    thd->lex->unit.cleanup();
1141
    thd->cleanup_after_query();
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1142 1143 1144 1145
    break;
  }
#endif
  case COM_QUIT:
1146
    /* We don't calculate statistics for this command */
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1147
    general_log_print(thd, command, NullS);
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1148
    net->error=0;				// Don't give 'abort' message
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Marc Alff committed
1149
    thd->stmt_da->disable_status();              // Don't send anything back
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bk@work.mysql.com committed
1150 1151
    error=TRUE;					// End server
    break;
1152
#ifndef EMBEDDED_LIBRARY
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1153 1154
  case COM_BINLOG_DUMP:
    {
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monty@mysql.com committed
1155 1156 1157 1158
      ulong pos;
      ushort flags;
      uint32 slave_server_id;

1159
      status_var_increment(thd->status_var.com_other);
1160
      thd->enable_slow_log= opt_log_slow_admin_statements;
1161
      if (check_global_access(thd, REPL_SLAVE_ACL))
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1162
	break;
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monty@donna.mysql.com committed
1163

1164
      /* TODO: The following has to be changed to an 8 byte integer */
1165 1166
      pos = uint4korr(packet);
      flags = uint2korr(packet + 4);
1167
      thd->server_id=0; /* avoid suicide */
1168
      if ((slave_server_id= uint4korr(packet+6))) // mysqlbinlog.server_id==0
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vva@eagle.mysql.r18.ru committed
1169
	kill_zombie_dump_threads(slave_server_id);
1170
      thd->server_id = slave_server_id;
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1171

cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
1172
      general_log_print(thd, command, "Log: '%s'  Pos: %ld", packet+10,
monty@mysql.com's avatar
monty@mysql.com committed
1173
                      (long) pos);
1174
      mysql_binlog_send(thd, thd->strdup(packet + 10), (my_off_t) pos, flags);
1175
      unregister_slave(thd,1,1);
monty@mysql.com's avatar
monty@mysql.com committed
1176
      /*  fake COM_QUIT -- if we get here, the thread needs to terminate */
1177
      error = TRUE;
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1178 1179
      break;
    }
1180
#endif
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1181
  case COM_REFRESH:
1182 1183
  {
    bool not_used;
1184
    status_var_increment(thd->status_var.com_stat[SQLCOM_FLUSH]);
1185
    ulong options= (ulong) (uchar) packet[0];
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Konstantin Osipov committed
1186
    if (trans_commit_implicit(thd))
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1187
      break;
1188
    close_thread_tables(thd);
1189
    thd->mdl_context.release_transactional_locks();
1190
    if (check_global_access(thd,RELOAD_ACL))
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1191
      break;
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cmiller@zippy.(none) committed
1192
    general_log_print(thd, command, NullS);
1193
#ifndef DBUG_OFF
1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208
    bool debug_simulate= FALSE;
    DBUG_EXECUTE_IF("simulate_detached_thread_refresh", debug_simulate= TRUE;);
    if (debug_simulate)
    {
      /*
        Simulate a reload without a attached thread session.
        Provides a environment similar to that of when the
        server receives a SIGHUP signal and reloads caches
        and flushes tables.
      */
      bool res;
      my_pthread_setspecific_ptr(THR_THD, NULL);
      res= reload_acl_and_cache(NULL, options | REFRESH_FAST,
                                NULL, &not_used);
      my_pthread_setspecific_ptr(THR_THD, thd);
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1209 1210
      if (res)
        break;
1211
    }
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1212
    else
1213
#endif
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1214 1215
    if (reload_acl_and_cache(thd, options, (TABLE_LIST*) 0, &not_used))
      break;
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Konstantin Osipov committed
1216
    if (trans_commit_implicit(thd))
Konstantin Osipov's avatar
Konstantin Osipov committed
1217
      break;
1218
    close_thread_tables(thd);
1219
    thd->mdl_context.release_transactional_locks();
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Konstantin Osipov committed
1220
    my_ok(thd);
1221 1222
    break;
  }
1223
#ifndef EMBEDDED_LIBRARY
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bk@work.mysql.com committed
1224
  case COM_SHUTDOWN:
1225
  {
1226
    status_var_increment(thd->status_var.com_other);
1227
    if (check_global_access(thd,SHUTDOWN_ACL))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1228
      break; /* purecov: inspected */
1229
    /*
1230
      If the client is < 4.1.3, it is going to send us no argument; then
1231
      packet_length is 0, packet[0] is the end 0 of the packet. Note that
1232 1233
      SHUTDOWN_DEFAULT is 0. If client is >= 4.1.3, the shutdown level is in
      packet[0].
1234
    */
1235 1236
    enum mysql_enum_shutdown_level level=
      (enum mysql_enum_shutdown_level) (uchar) packet[0];
1237 1238 1239 1240 1241 1242 1243
    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;
    }
1244
    DBUG_PRINT("quit",("Got shutdown command for level %u", level));
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
1245
    general_log_print(thd, command, NullS);
1246
    my_eof(thd);
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bk@work.mysql.com committed
1247 1248 1249 1250
    close_thread_tables(thd);			// Free before kill
    kill_mysql();
    error=TRUE;
    break;
1251
  }
1252
#endif
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bk@work.mysql.com committed
1253 1254
  case COM_STATISTICS:
  {
1255 1256 1257
    STATUS_VAR current_global_status_var;
    ulong uptime;
    uint length;
1258
    ulonglong queries_per_second1000;
1259 1260
    char buff[250];
    uint buff_len= sizeof(buff);
1261

1262
    general_log_print(thd, command, NullS);
1263
    status_var_increment(thd->status_var.com_stat[SQLCOM_SHOW_STATUS]);
1264
    calc_sum_of_all_status(&current_global_status_var);
1265 1266 1267 1268 1269
    if (!(uptime= (ulong) (thd->start_time - server_start_time)))
      queries_per_second1000= 0;
    else
      queries_per_second1000= thd->query_id * LL(1000) / uptime;

1270 1271 1272
    length= my_snprintf((char*) buff, buff_len - 1,
                        "Uptime: %lu  Threads: %d  Questions: %lu  "
                        "Slow queries: %lu  Opens: %lu  Flush tables: %lu  "
1273
                        "Open tables: %u  Queries per second avg: %u.%u",
1274 1275 1276 1277 1278 1279
                        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(),
1280 1281
                        (uint) (queries_per_second1000 / 1000),
                        (uint) (queries_per_second1000 % 1000));
1282 1283
#ifdef EMBEDDED_LIBRARY
    /* Store the buffer in permanent memory */
1284
    my_ok(thd, 0, 0, buff);
1285
#endif
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1286
#ifdef SAFEMALLOC
1287
    if (sf_malloc_cur_memory)				// Using SAFEMALLOC
1288 1289 1290 1291 1292 1293 1294
    {
      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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hf@deer.(none) committed
1295 1296
#endif
#ifndef EMBEDDED_LIBRARY
Konstantin Osipov's avatar
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1297 1298
    (void) my_net_write(net, (uchar*) buff, length);
    (void) net_flush(net);
Marc Alff's avatar
Marc Alff committed
1299
    thd->stmt_da->disable_status();
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hf@deer.(none) committed
1300
#endif
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1301 1302 1303
    break;
  }
  case COM_PING:
1304
    status_var_increment(thd->status_var.com_other);
1305
    my_ok(thd);				// Tell client we are alive
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bk@work.mysql.com committed
1306 1307
    break;
  case COM_PROCESS_INFO:
1308
    status_var_increment(thd->status_var.com_stat[SQLCOM_SHOW_PROCESSLIST]);
1309 1310
    if (!thd->security_ctx->priv_user[0] &&
        check_global_access(thd, PROCESS_ACL))
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bk@work.mysql.com committed
1311
      break;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
1312
    general_log_print(thd, command, NullS);
hf@deer.(none)'s avatar
hf@deer.(none) committed
1313
    mysqld_list_processes(thd,
1314 1315
			  thd->security_ctx->master_access & PROCESS_ACL ? 
			  NullS : thd->security_ctx->priv_user, 0);
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bk@work.mysql.com committed
1316 1317 1318
    break;
  case COM_PROCESS_KILL:
  {
1319
    status_var_increment(thd->status_var.com_stat[SQLCOM_KILL]);
1320
    ulong id=(ulong) uint4korr(packet);
1321
    sql_kill(thd,id,false);
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bk@work.mysql.com committed
1322 1323
    break;
  }
1324 1325
  case COM_SET_OPTION:
  {
1326
    status_var_increment(thd->status_var.com_stat[SQLCOM_SET_OPTION]);
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
1327 1328 1329 1330
    uint opt_command= uint2korr(packet);

    switch (opt_command) {
    case (int) MYSQL_OPTION_MULTI_STATEMENTS_ON:
1331
      thd->client_capabilities|= CLIENT_MULTI_STATEMENTS;
1332
      my_eof(thd);
1333
      break;
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
1334
    case (int) MYSQL_OPTION_MULTI_STATEMENTS_OFF:
1335
      thd->client_capabilities&= ~CLIENT_MULTI_STATEMENTS;
1336
      my_eof(thd);
1337 1338
      break;
    default:
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bell@sanja.is.com.ua committed
1339
      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
1340 1341 1342 1343
      break;
    }
    break;
  }
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1344
  case COM_DEBUG:
1345
    status_var_increment(thd->status_var.com_other);
1346
    if (check_global_access(thd, SUPER_ACL))
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bk@work.mysql.com committed
1347
      break;					/* purecov: inspected */
1348
    mysql_print_status();
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
1349
    general_log_print(thd, command, NullS);
1350
    my_eof(thd);
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bk@work.mysql.com committed
1351 1352 1353 1354 1355
    break;
  case COM_SLEEP:
  case COM_CONNECT:				// Impossible here
  case COM_TIME:				// Impossible from client
  case COM_DELAYED_INSERT:
1356
  case COM_END:
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1357
  default:
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    my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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    break;
  }
1361

1362
  /* report error issued during command execution */
1363 1364
  if (thd->killed_errno())
  {
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    if (! thd->stmt_da->is_set())
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      thd->send_kill_message();
  }
  if (thd->killed == THD::KILL_QUERY || thd->killed == THD::KILL_BAD_DATA)
  {
    thd->killed= THD::NOT_KILLED;
    thd->mysys_var->abort= 0;
  }

1374
  /* If commit fails, we should be able to reset the OK status. */
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  thd->stmt_da->can_overwrite_status= TRUE;
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  thd->is_error() ? trans_rollback_stmt(thd) : trans_commit_stmt(thd);
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  thd->stmt_da->can_overwrite_status= FALSE;
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  thd->transaction.stmt.reset();

1381
  thd->protocol->end_statement();
1382
  query_cache_end_of_result(thd);
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  thd->proc_info= "closing tables";
  /* Free tables */
  close_thread_tables(thd);

1388
  if (!thd->is_error() && !thd->killed_errno())
1389
    mysql_audit_general(thd, MYSQL_AUDIT_GENERAL_RESULT, 0, 0);
1390

1391
  log_slow_statement(thd);
1392

1393
  thd_proc_info(thd, "cleaning up");
1394
  thd->set_query(NULL, 0);
1395
  thd->command=COM_SLEEP;
1396
  dec_thread_running();
1397
  thd_proc_info(thd, 0);
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  thd->packet.shrink(thd->variables.net_buffer_length);	// Reclaim some memory
  free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
1400

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


1418
void log_slow_statement(THD *thd)
1419
{
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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
1429

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  /*
    Do not log administrative statements unless the appropriate option is
1432
    set.
1433
  */
1434
  if (thd->enable_slow_log)
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  {
1436
    ulonglong end_utime_of_query= thd->current_utime();
1437
    thd_proc_info(thd, "logging slow query");
1438

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    if (((end_utime_of_query - thd->utime_after_lock) >
         thd->variables.long_query_time ||
         ((thd->server_status &
           (SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED)) &&
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          opt_log_queries_not_using_indexes &&
           !(sql_command_flags[thd->lex->sql_command] & CF_STATUS_COMMAND))) &&
1445
        thd->examined_row_count >= thd->variables.min_examined_row_limit)
1446
    {
1447
      thd_proc_info(thd, "logging slow query");
1448
      thd->status_var.long_query_count++;
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      slow_log_print(thd, thd->query(), thd->query_length(), 
                     end_utime_of_query);
1451
    }
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  }
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  DBUG_VOID_RETURN;
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}

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

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

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

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

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

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int prepare_schema_table(THD *thd, LEX *lex, Table_ident *table_ident,
                         enum enum_schema_tables schema_table_idx)
{
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  SELECT_LEX *schema_select_lex= NULL;
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  DBUG_ENTER("prepare_schema_table");
1488

1489
  switch (schema_table_idx) {
1490 1491
  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:
1502
  case SCH_TRIGGERS:
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1503
  case SCH_EVENTS:
1504
#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;
1511
      size_t dummy;
1512
      if (lex->select_lex.db == NULL &&
1513
          lex->copy_db_to(&lex->select_lex.db, &dummy))
1514
      {
1515
        DBUG_RETURN(1);
1516
      }
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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;
1520
      db.length= strlen(db.str);
1521

1522
      if (check_db_name(&db))
1523
      {
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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:
1532
  {
1533
#ifdef DONT_ALLOW_SHOW_COMMANDS
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1534 1535
    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;
  }
1549
#endif
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  case SCH_PROFILES:
    /* 
      Mark this current profiling record to be discarded.  We don't
      wish to have SHOW commands show up in profiling.
    */
1555
#if defined(ENABLED_PROFILING)
1556
    thd->profiling.discard_current_query();
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#endif
    break;
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  case SCH_OPEN_TABLES:
  case SCH_VARIABLES:
  case SCH_STATUS:
1562 1563
  case SCH_PROCEDURES:
  case SCH_CHARSETS:
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1564
  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;
1583
  table_list->schema_select_lex= schema_select_lex;
1584
  table_list->schema_table_reformed= 1;
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  DBUG_RETURN(0);
}


1589 1590 1591
/**
  Read query from packet and store in thd->query.
  Used in COM_QUERY and COM_STMT_PREPARE.
1592 1593

    Sets the following THD variables:
1594 1595
  - query
  - query_length
1596

1597
  @retval
1598
    FALSE ok
1599
  @retval
1600
    TRUE  error;  In this case thd->fatal_error is set
1601 1602
*/

1603
bool alloc_query(THD *thd, const char *packet, uint packet_length)
1604
{
1605
  char *query;
1606
  /* Remove garbage at start and end of query */
1607
  while (packet_length > 0 && my_isspace(thd->charset(), packet[0]))
1608 1609 1610 1611
  {
    packet++;
    packet_length--;
  }
1612
  const char *pos= packet + packet_length;     // Point at end null
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1613
  while (packet_length > 0 &&
1614
	 (pos[-1] == ';' || my_isspace(thd->charset() ,pos[-1])))
1615 1616 1617 1618 1619
  {
    pos--;
    packet_length--;
  }
  /* We must allocate some extra memory for query cache */
1620 1621 1622 1623 1624 1625 1626
  if (! (query= (char*) thd->memdup_w_gap(packet,
                                          packet_length,
                                          1 + thd->db_length +
                                          QUERY_CACHE_FLAGS_SIZE)))
      return TRUE;
  query[packet_length]= '\0';
  thd->set_query(query, packet_length);
1627 1628 1629 1630

  /* Reclaim some memory */
  thd->packet.shrink(thd->variables.net_buffer_length);
  thd->convert_buffer.shrink(thd->variables.net_buffer_length);
1631

1632
  return FALSE;
1633 1634
}

1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647
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;
1648
  thd->variables.lc_time_names= &my_locale_en_US;
1649 1650 1651
  thd->one_shot_set= 0;
}

1652

1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698
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);

1699
    if (thd->slave_thread && lex->sphead)
1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737
      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);
}


1738 1739
/**
  Execute command saved in thd and lex->sql_command.
1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750

    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.

1751 1752 1753 1754 1755 1756 1757 1758 1759 1760
  @param thd                       Thread handle

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

  @retval
1761
    FALSE       OK
1762
  @retval
1763 1764
    TRUE        Error
*/
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1765

1766
int
1767
mysql_execute_command(THD *thd)
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1768
{
1769
  int res= FALSE;
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1770
  int  up_result= 0;
1771
  LEX  *lex= thd->lex;
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1772
  /* first SELECT_LEX (have special meaning for many of non-SELECTcommands) */
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1773
  SELECT_LEX *select_lex= &lex->select_lex;
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1774
  /* first table of first SELECT_LEX */
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1775
  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 */
1779
  SELECT_LEX_UNIT *unit= &lex->unit;
1780 1781 1782 1783
#ifdef HAVE_REPLICATION
  /* have table map for update for multi-update statement (BUG#37051) */
  bool have_table_map_for_update= FALSE;
#endif
1784
  /* Saved variable value */
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1785
  DBUG_ENTER("mysql_execute_command");
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#ifdef WITH_PARTITION_STORAGE_ENGINE
  thd->work_part_info= 0;
#endif
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1789

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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();
1806
  /* should be assigned after making first tables same */
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1807
  all_tables= lex->query_tables;
1808 1809 1810 1811
  /* 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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1813 1814 1815 1816 1817 1818
  /*
    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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1819 1820 1821 1822 1823 1824 1825 1826
  if ((sql_command_flags[lex->sql_command] & CF_DIAGNOSTIC_STMT) != 0)
    thd->warning_info->set_read_only(TRUE);
  else
  {
    thd->warning_info->set_read_only(FALSE);
    if (all_tables)
      thd->warning_info->opt_clear_warning_info(thd->query_id);
  }
1827

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1828
#ifdef HAVE_REPLICATION
1829
  if (unlikely(thd->slave_thread))
1830
  {
1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853
    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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    /*
      For fix of BUG#37051, the master stores the table map for update
      in the Query_log_event, and the value is assigned to
      thd->variables.table_map_for_update before executing the update
      query.

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

      if (all_tables_not_ok(thd, all_tables))
      {
        /* we warn the slave SQL thread */
        my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
        if (thd->one_shot_set)
          reset_one_shot_variables(thd);
        DBUG_RETURN(0);
      }
      
      for (table=all_tables; table; table=table->next_global)
        table->updating= TRUE;
    }
1896
    
peter@mysql.com's avatar
peter@mysql.com committed
1897
    /*
1898 1899
      Check if statment should be skipped because of slave filtering
      rules
1900 1901

      Exceptions are:
1902 1903
      - UPDATE MULTI: For this statement, we want to check the filtering
        rules later in the code
1904
      - SET: we always execute it (Not that many SET commands exists in
lars@mysql.com's avatar
lars@mysql.com committed
1905 1906
        the binary log anyway -- only 4.1 masters write SET statements,
	in 5.0 there are no SET statements in the binary log)
1907 1908
      - DROP TEMPORARY TABLE IF EXISTS: we always execute it (otherwise we
        have stale files on slave caused by exclusion of one tmp table).
monty@hundin.mysql.fi's avatar
merge  
monty@hundin.mysql.fi committed
1909
    */
1910 1911
    if (!(lex->sql_command == SQLCOM_UPDATE_MULTI) &&
	!(lex->sql_command == SQLCOM_SET_OPTION) &&
1912
	!(lex->sql_command == SQLCOM_DROP_TABLE &&
1913
          lex->drop_temporary && lex->drop_if_exists) &&
guilhem@mysql.com's avatar
Merge  
guilhem@mysql.com committed
1914
        all_tables_not_ok(thd, all_tables))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
1915 1916
    {
      /* we warn the slave SQL thread */
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
1917
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934
      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);
      }
1935
      DBUG_RETURN(0);
guilhem@mysql.com's avatar
guilhem@mysql.com committed
1936
    }
1937
  }
1938
  else
1939
  {
1940
#endif /* HAVE_REPLICATION */
1941 1942 1943 1944
    /*
      When option readonly is set deny operations which change non-temporary
      tables. Except for the replication thread and the 'super' users.
    */
1945
    if (deny_updates_if_read_only_option(thd, all_tables))
1946 1947 1948 1949 1950 1951 1952
    {
      my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
      DBUG_RETURN(-1);
    }
#ifdef HAVE_REPLICATION
  } /* endif unlikely slave */
#endif
Konstantin Osipov's avatar
Konstantin Osipov committed
1953

1954
  status_var_increment(thd->status_var.com_stat[lex->sql_command]);
1955

1956
  DBUG_ASSERT(thd->transaction.stmt.modified_non_trans_table == FALSE);
Konstantin Osipov's avatar
Konstantin Osipov committed
1957 1958 1959 1960 1961 1962 1963

  /*
    End a active transaction so that this command will have it's
    own transaction and will also sync the binary log. If a DDL is
    not run in it's own transaction it may simply never appear on
    the slave in case the outside transaction rolls back.
  */
1964 1965 1966 1967 1968 1969 1970 1971 1972
  if (stmt_causes_implicit_commit(thd, CF_IMPLICT_COMMIT_BEGIN))
  {
    /* Commit or rollback the statement transaction. */
    thd->is_error() ? trans_rollback_stmt(thd) : trans_commit_stmt(thd);
    /* Commit the normal transaction if one is active. */
    if (trans_commit_implicit(thd))
      goto error;
    /* Close tables and release metadata locks. */
    close_thread_tables(thd);
1973
    thd->mdl_context.release_transactional_locks();
1974
  }
Konstantin Osipov's avatar
Konstantin Osipov committed
1975

Jon Olav Hauglid's avatar
Jon Olav Hauglid committed
1976 1977 1978 1979 1980 1981 1982 1983
  /*
    Check if this command needs protection against the global read lock
    to avoid deadlock. See CF_PROTECT_AGAINST_GRL.
    start_waiting_global_read_lock() is called at the end of
    mysql_execute_command().
  */
  if (((sql_command_flags[lex->sql_command] & CF_PROTECT_AGAINST_GRL) != 0) &&
      !thd->locked_tables_mode)
1984
    if (thd->global_read_lock.wait_if_global_read_lock(thd, FALSE, TRUE))
Jon Olav Hauglid's avatar
Jon Olav Hauglid committed
1985 1986
      goto error;

bk@work.mysql.com's avatar
bk@work.mysql.com committed
1987
  switch (lex->sql_command) {
1988

1989
  case SQLCOM_SHOW_EVENTS:
1990 1991 1992 1993
#ifndef HAVE_EVENT_SCHEDULER
    my_error(ER_NOT_SUPPORTED_YET, MYF(0), "embedded server");
    break;
#endif
1994 1995
  case SQLCOM_SHOW_STATUS_PROC:
  case SQLCOM_SHOW_STATUS_FUNC:
Konstantin Osipov's avatar
Konstantin Osipov committed
1996
    if ((res= check_table_access(thd, SELECT_ACL, all_tables, FALSE,
1997
                                  UINT_MAX, FALSE)))
Konstantin Osipov's avatar
Konstantin Osipov committed
1998 1999
      goto error;
    res= execute_sqlcom_select(thd, all_tables);
2000 2001 2002 2003 2004
    break;
  case SQLCOM_SHOW_STATUS:
  {
    system_status_var old_status_var= thd->status_var;
    thd->initial_status_var= &old_status_var;
2005 2006
    if (!(res= check_table_access(thd, SELECT_ACL, all_tables, FALSE,
                                  UINT_MAX, FALSE)))
2007
      res= execute_sqlcom_select(thd, all_tables);
2008 2009 2010 2011 2012 2013 2014
    /* 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
    */
Marc Alff's avatar
Marc Alff committed
2015
    mysql_mutex_lock(&LOCK_status);
2016 2017 2018
    add_diff_to_status(&global_status_var, &thd->status_var,
                       &old_status_var);
    thd->status_var= old_status_var;
Marc Alff's avatar
Marc Alff committed
2019
    mysql_mutex_unlock(&LOCK_status);
2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032
    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:
2033
  case SQLCOM_SHOW_STORAGE_ENGINES:
2034
  case SQLCOM_SHOW_PROFILE:
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2035
  case SQLCOM_SELECT:
2036
  {
2037
    thd->status_var.last_query_cost= 0.0;
2038 2039 2040 2041 2042 2043 2044 2045

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

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2046
    if (all_tables)
2047
      res= check_table_access(thd,
2048 2049
                              privileges_requested,
                              all_tables, FALSE, UINT_MAX, FALSE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2050
    else
Marc Alff's avatar
Marc Alff committed
2051
      res= check_access(thd, privileges_requested, any_db, NULL, NULL, 0, 0);
2052

2053 2054 2055
    if (res)
      break;

Konstantin Osipov's avatar
Konstantin Osipov committed
2056
    if (!thd->locked_tables_mode && lex->protect_against_global_read_lock &&
2057
        thd->global_read_lock.wait_if_global_read_lock(thd, FALSE, TRUE))
2058 2059 2060
      break;

    res= execute_sqlcom_select(thd, all_tables);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2061
    break;
2062 2063
  }
case SQLCOM_PREPARE:
2064
  {
2065
    mysql_sql_stmt_prepare(thd);
sergefp@mysql.com's avatar
sergefp@mysql.com committed
2066 2067 2068 2069
    break;
  }
  case SQLCOM_EXECUTE:
  {
2070
    mysql_sql_stmt_execute(thd);
sergefp@mysql.com's avatar
sergefp@mysql.com committed
2071 2072 2073 2074
    break;
  }
  case SQLCOM_DEALLOCATE_PREPARE:
  {
2075
    mysql_sql_stmt_close(thd);
sergefp@mysql.com's avatar
sergefp@mysql.com committed
2076 2077
    break;
  }
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2078
  case SQLCOM_DO:
2079 2080
    if (check_table_access(thd, SELECT_ACL, all_tables, FALSE, UINT_MAX, FALSE)
        || open_and_lock_tables(thd, all_tables))
2081
      goto error;
2082 2083

    res= mysql_do(thd, *lex->insert_list);
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2084 2085
    break;

2086
  case SQLCOM_EMPTY_QUERY:
2087
    my_ok(thd);
2088 2089
    break;

2090 2091 2092 2093
  case SQLCOM_HELP:
    res= mysqld_help(thd,lex->help_arg);
    break;

2094
#ifndef EMBEDDED_LIBRARY
2095
  case SQLCOM_PURGE:
2096
  {
2097
    if (check_global_access(thd, SUPER_ACL))
2098
      goto error;
monty@mysql.com's avatar
monty@mysql.com committed
2099
    /* PURGE MASTER LOGS TO 'file' */
2100 2101 2102
    res = purge_master_logs(thd, lex->to_log);
    break;
  }
2103 2104
  case SQLCOM_PURGE_BEFORE:
  {
2105 2106
    Item *it;

2107 2108
    if (check_global_access(thd, SUPER_ACL))
      goto error;
monty@mysql.com's avatar
monty@mysql.com committed
2109
    /* PURGE MASTER LOGS BEFORE 'data' */
2110
    it= (Item *)lex->value_list.head();
2111
    if ((!it->fixed && it->fix_fields(lex->thd, &it)) ||
2112
        it->check_cols(1))
2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123
    {
      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());
2124 2125
    break;
  }
2126
#endif
2127 2128
  case SQLCOM_SHOW_WARNS:
  {
2129 2130
    res= mysqld_show_warnings(thd, (ulong)
			      ((1L << (uint) MYSQL_ERROR::WARN_LEVEL_NOTE) |
2131 2132 2133
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_WARN) |
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR)
			       ));
2134 2135 2136 2137
    break;
  }
  case SQLCOM_SHOW_ERRORS:
  {
2138 2139
    res= mysqld_show_warnings(thd, (ulong)
			      (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR));
2140 2141
    break;
  }
2142 2143
  case SQLCOM_SHOW_PROFILES:
  {
2144
#if defined(ENABLED_PROFILING)
2145
    thd->profiling.discard_current_query();
2146
    res= thd->profiling.show_profiles();
2147 2148 2149
    if (res)
      goto error;
#else
2150
    my_error(ER_FEATURE_DISABLED, MYF(0), "SHOW PROFILES", "enable-profiling");
2151 2152
    goto error;
#endif
2153 2154
    break;
  }
2155 2156
  case SQLCOM_SHOW_NEW_MASTER:
  {
2157
    if (check_global_access(thd, REPL_SLAVE_ACL))
2158
      goto error;
2159
    /* This query don't work now. See comment in repl_failsafe.cc */
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2160
#ifndef WORKING_NEW_MASTER
2161 2162
    my_error(ER_NOT_SUPPORTED_YET, MYF(0), "SHOW NEW MASTER");
    goto error;
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2163
#else
2164 2165
    res = show_new_master(thd);
    break;
2166
#endif
2167
  }
2168

2169
#ifdef HAVE_REPLICATION
2170 2171
  case SQLCOM_SHOW_SLAVE_HOSTS:
  {
2172
    if (check_global_access(thd, REPL_SLAVE_ACL))
2173 2174 2175 2176
      goto error;
    res = show_slave_hosts(thd);
    break;
  }
2177
  case SQLCOM_SHOW_RELAYLOG_EVENTS: /* fall through */
2178 2179
  case SQLCOM_SHOW_BINLOG_EVENTS:
  {
2180
    if (check_global_access(thd, REPL_SLAVE_ACL))
2181
      goto error;
2182
    res = mysql_show_binlog_events(thd);
2183 2184
    break;
  }
2185 2186
#endif

igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2187 2188
  case SQLCOM_ASSIGN_TO_KEYCACHE:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2189
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2190
    if (check_access(thd, INDEX_ACL, first_table->db,
Marc Alff's avatar
Marc Alff committed
2191 2192 2193
                     &first_table->grant.privilege,
                     &first_table->grant.m_internal,
                     0, 0))
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2194
      goto error;
2195
    res= mysql_assign_to_keycache(thd, first_table, &lex->ident);
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2196 2197
    break;
  }
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2198 2199
  case SQLCOM_PRELOAD_KEYS:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2200
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2201
    if (check_access(thd, INDEX_ACL, first_table->db,
Marc Alff's avatar
Marc Alff committed
2202 2203 2204
                     &first_table->grant.privilege,
                     &first_table->grant.m_internal,
                     0, 0))
2205
      goto error;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2206
    res = mysql_preload_keys(thd, first_table);
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2207 2208
    break;
  }
2209
#ifdef HAVE_REPLICATION
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2210
  case SQLCOM_CHANGE_MASTER:
2211
  {
2212
    if (check_global_access(thd, SUPER_ACL))
2213
      goto error;
Marc Alff's avatar
Marc Alff committed
2214
    mysql_mutex_lock(&LOCK_active_mi);
2215
    res = change_master(thd,active_mi);
Marc Alff's avatar
Marc Alff committed
2216
    mysql_mutex_unlock(&LOCK_active_mi);
2217 2218
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2219
  case SQLCOM_SHOW_SLAVE_STAT:
2220
  {
2221 2222
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2223
      goto error;
Marc Alff's avatar
Marc Alff committed
2224
    mysql_mutex_lock(&LOCK_active_mi);
2225 2226 2227 2228 2229 2230
    if (active_mi != NULL)
    {
      res = show_master_info(thd, active_mi);
    }
    else
    {
2231 2232
      push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                   WARN_NO_MASTER_INFO, ER(WARN_NO_MASTER_INFO));
2233
      my_ok(thd);
2234
    }
Marc Alff's avatar
Marc Alff committed
2235
    mysql_mutex_unlock(&LOCK_active_mi);
2236 2237
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2238
  case SQLCOM_SHOW_MASTER_STAT:
2239
  {
2240 2241
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2242 2243 2244 2245
      goto error;
    res = show_binlog_info(thd);
    break;
  }
peter@mysql.com's avatar
peter@mysql.com committed
2246

2247
#endif /* HAVE_REPLICATION */
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
2248
  case SQLCOM_SHOW_ENGINE_STATUS:
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2249
    {
2250
      if (check_global_access(thd, PROCESS_ACL))
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
2251 2252
        goto error;
      res = ha_show_status(thd, lex->create_info.db_type, HA_ENGINE_STATUS);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2253 2254
      break;
    }
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
2255
  case SQLCOM_SHOW_ENGINE_MUTEX:
vtkachenko@intelp4d.mysql.com's avatar
vtkachenko@intelp4d.mysql.com committed
2256
    {
2257
      if (check_global_access(thd, PROCESS_ACL))
vtkachenko@intelp4d.mysql.com's avatar
vtkachenko@intelp4d.mysql.com committed
2258
        goto error;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
2259
      res = ha_show_status(thd, lex->create_info.db_type, HA_ENGINE_MUTEX);
vtkachenko@intelp4d.mysql.com's avatar
vtkachenko@intelp4d.mysql.com committed
2260 2261
      break;
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2262
  case SQLCOM_CREATE_TABLE:
2263
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2264 2265
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    bool link_to_local;
2266 2267 2268
    TABLE_LIST *create_table= first_table;
    TABLE_LIST *select_tables= lex->create_last_non_select_table->next_global;

2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289
    /*
      Code below (especially in mysql_create_table() and select_create
      methods) may modify HA_CREATE_INFO structure in LEX, so we have to
      use a copy of this structure to make execution prepared statement-
      safe. A shallow copy is enough as this code won't modify any memory
      referenced from this structure.
    */
    HA_CREATE_INFO create_info(lex->create_info);
    /*
      We need to copy alter_info for the same reasons of re-execution
      safety, only in case of Alter_info we have to do (almost) a deep
      copy.
    */
    Alter_info alter_info(lex->alter_info, thd->mem_root);

    if (thd->is_fatal_error)
    {
      /* If out of memory when creating a copy of alter_info. */
      res= 1;
      goto end_with_restore_list;
    }
monty@mysql.com's avatar
monty@mysql.com committed
2290

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2291
    if ((res= create_table_precheck(thd, select_tables, create_table)))
monty@mysql.com's avatar
monty@mysql.com committed
2292
      goto end_with_restore_list;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2293

2294 2295 2296
    /* Might have been updated in create_table_precheck */
    create_info.alias= create_table->alias;

2297
#ifdef HAVE_READLINK
2298
    /* Fix names if symlinked tables */
2299
    if (append_file_to_dir(thd, &create_info.data_file_name,
2300
			   create_table->table_name) ||
2301
	append_file_to_dir(thd, &create_info.index_file_name,
2302
			   create_table->table_name))
monty@mysql.com's avatar
monty@mysql.com committed
2303
      goto end_with_restore_list;
2304
#endif
2305
    /*
2306
      If we are using SET CHARSET without DEFAULT, add an implicit
2307 2308
      DEFAULT to not confuse old users. (This may change).
    */
2309
    if ((create_info.used_fields &
2310 2311 2312
	 (HA_CREATE_USED_DEFAULT_CHARSET | HA_CREATE_USED_CHARSET)) ==
	HA_CREATE_USED_CHARSET)
    {
2313 2314 2315 2316
      create_info.used_fields&= ~HA_CREATE_USED_CHARSET;
      create_info.used_fields|= HA_CREATE_USED_DEFAULT_CHARSET;
      create_info.default_table_charset= create_info.table_charset;
      create_info.table_charset= 0;
2317
    }
2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328
    /*
      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
2329
      created during a global read lock.
Jon Olav Hauglid's avatar
Jon Olav Hauglid committed
2330
      Protection against grl is covered by the CF_PROTECT_AGAINST_GRL flag.
2331
    */
Jon Olav Hauglid's avatar
Jon Olav Hauglid committed
2332

2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343
#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
2344

2345 2346 2347 2348
    /* Set strategies: reset default or 'prepared' values. */
    create_table->open_strategy= TABLE_LIST::OPEN_IF_EXISTS;
    create_table->lock_strategy= TABLE_LIST::EXCLUSIVE_DOWNGRADABLE_MDL;

2349 2350 2351 2352 2353
    /*
      Close any open handlers for the table
    */
    mysql_ha_rm_tables(thd, create_table);

2354
    if (select_lex->item_list.elements)		// With select
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2355 2356
    {
      select_result *result;
2357

2358 2359 2360
      /*
        If:
        a) we inside an SP and there was NAME_CONST substitution,
Ramil Kalimullin's avatar
Ramil Kalimullin committed
2361
        b) binlogging is on (STMT mode),
2362 2363 2364 2365 2366 2367
        c) we log the SP as separate statements
        raise a warning, as it may cause problems
        (see 'NAME_CONST issues' in 'Binary Logging of Stored Programs')
       */
      if (thd->query_name_consts && 
          mysql_bin_log.is_open() &&
Ramil Kalimullin's avatar
Ramil Kalimullin committed
2368
          thd->variables.binlog_format == BINLOG_FORMAT_STMT &&
2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394
          !mysql_bin_log.is_query_in_union(thd, thd->query_id))
      {
        List_iterator_fast<Item> it(select_lex->item_list);
        Item *item;
        uint splocal_refs= 0;
        /* Count SP local vars in the top-level SELECT list */
        while ((item= it++))
        {
          if (item->is_splocal())
            splocal_refs++;
        }
        /*
          If it differs from number of NAME_CONST substitution applied,
          we may have a SOME_FUNC(NAME_CONST()) in the SELECT list,
          that may cause a problem with binary log (see BUG#35383),
          raise a warning. 
        */
        if (splocal_refs != thd->query_name_consts)
          push_warning(thd, 
                       MYSQL_ERROR::WARN_LEVEL_WARN,
                       ER_UNKNOWN_ERROR,
"Invoked routine ran a statement that may cause problems with "
"binary log, see 'NAME_CONST issues' in 'Binary Logging of Stored Programs' "
"section of the manual.");
      }
      
2395
      select_lex->options|= SELECT_NO_UNLOCK;
2396
      unit->set_limit(select_lex);
2397

2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410
      /*
        Disable non-empty MERGE tables with CREATE...SELECT. Too
        complicated. See Bug #26379. Empty MERGE tables are read-only
        and don't allow CREATE...SELECT anyway.
      */
      if (create_info.used_fields & HA_CREATE_USED_UNION)
      {
        my_error(ER_WRONG_OBJECT, MYF(0), create_table->db,
                 create_table->table_name, "BASE TABLE");
        res= 1;
        goto end_with_restore_list;
      }

2411
      if (!(create_info.options & HA_LEX_CREATE_TMP_TABLE))
dlenev@mockturtle.local's avatar
dlenev@mockturtle.local committed
2412
      {
2413
        /* Base table and temporary table are not in the same name space. */
2414
        create_table->open_type= OT_BASE_ONLY;
dlenev@mockturtle.local's avatar
dlenev@mockturtle.local committed
2415 2416
      }

2417
      if (!(res= open_and_lock_tables_derived(thd, lex->query_tables, TRUE, 0)))
2418
      {
2419 2420 2421 2422
        /*
          Is table which we are changing used somewhere in other parts
          of query
        */
2423
        if (!(create_info.options & HA_LEX_CREATE_TMP_TABLE))
2424
        {
2425
          TABLE_LIST *duplicate;
2426
          if ((duplicate= unique_table(thd, create_table, select_tables, 0)))
2427 2428 2429
          {
            update_non_unique_table_error(create_table, "CREATE", duplicate);
            res= 1;
2430
            goto end_with_restore_list;
2431
          }
2432
        }
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2433
        /* If we create merge table, we have to test tables in merge, too */
2434
        if (create_info.used_fields & HA_CREATE_USED_UNION)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2435 2436
        {
          TABLE_LIST *tab;
2437
          for (tab= (TABLE_LIST*) create_info.merge_list.first;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2438 2439 2440
               tab;
               tab= tab->next_local)
          {
2441
            TABLE_LIST *duplicate;
2442
            if ((duplicate= unique_table(thd, tab, select_tables, 0)))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2443
            {
2444
              update_non_unique_table_error(tab, "CREATE", duplicate);
monty@mysql.com's avatar
monty@mysql.com committed
2445
              res= 1;
2446
              goto end_with_restore_list;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2447 2448 2449
            }
          }
        }
2450

2451 2452 2453 2454 2455 2456 2457
        /*
          Remove target table from main select and name resolution
          context. This can't be done earlier as it will break view merging in
          statements like "CREATE TABLE IF NOT EXISTS existing_view SELECT".
        */
        lex->unlink_first_table(&link_to_local);

dlenev@mockturtle.local's avatar
dlenev@mockturtle.local committed
2458
        /*
2459 2460
          select_create is currently not re-execution friendly and
          needs to be created for every execution of a PS/SP.
dlenev@mockturtle.local's avatar
dlenev@mockturtle.local committed
2461
        */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2462
        if ((result= new select_create(create_table,
2463 2464 2465 2466
                                       &create_info,
                                       &alter_info,
                                       select_lex->item_list,
                                       lex->duplicates,
2467
                                       lex->ignore,
2468
                                       select_tables)))
2469 2470 2471 2472 2473
        {
          /*
            CREATE from SELECT give its SELECT_LEX for SELECT,
            and item_list belong to SELECT
          */
2474
          res= handle_select(thd, lex, result, 0);
2475
          delete result;
2476
        }
2477 2478
        
        lex->link_first_table_back(create_table, link_to_local);
2479 2480
      }
    }
monty@mysql.com's avatar
monty@mysql.com committed
2481
    else
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2482
    {
2483
      /* So that CREATE TEMPORARY TABLE gets to binlog at commit/rollback */
2484
      if (create_info.options & HA_LEX_CREATE_TMP_TABLE)
2485
        thd->variables.option_bits|= OPTION_KEEP_LOG;
monty@mysql.com's avatar
monty@mysql.com committed
2486
      /* regular create */
2487
      if (create_info.options & HA_LEX_CREATE_TABLE_LIKE)
2488 2489
      {
        /* CREATE TABLE ... LIKE ... */
2490
        res= mysql_create_like_table(thd, create_table, select_tables,
2491
                                     &create_info);
2492
      }
venu@myvenu.com's avatar
venu@myvenu.com committed
2493
      else
2494
      {
2495 2496 2497
        /* Regular CREATE TABLE */
        res= mysql_create_table(thd, create_table,
                                &create_info, &alter_info);
2498
      }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2499
      if (!res)
2500
        my_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2501
    }
2502

monty@mysql.com's avatar
monty@mysql.com committed
2503
end_with_restore_list:
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2504
    break;
2505
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2506
  case SQLCOM_CREATE_INDEX:
2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524
    /* Fall through */
  case SQLCOM_DROP_INDEX:
  /*
    CREATE INDEX and DROP INDEX are implemented by calling ALTER
    TABLE with proper arguments.

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

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

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2525 2526
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_one_table_access(thd, INDEX_ACL, all_tables))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2527
      goto error; /* purecov: inspected */
2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538
    /*
      Currently CREATE INDEX or DROP INDEX cause a full table rebuild
      and thus classify as slow administrative statements just like
      ALTER TABLE.
    */
    thd->enable_slow_log= opt_log_slow_admin_statements;

    bzero((char*) &create_info, sizeof(create_info));
    create_info.db_type= 0;
    create_info.row_type= ROW_TYPE_NOT_USED;
    create_info.default_table_charset= thd->variables.collation_database;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2539

2540 2541 2542 2543 2544
    res= mysql_alter_table(thd, first_table->db, first_table->table_name,
                           &create_info, first_table, &alter_info,
                           0, (ORDER*) 0, 0);
    break;
  }
2545
#ifdef HAVE_REPLICATION
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2546
  case SQLCOM_SLAVE_START:
2547
  {
Marc Alff's avatar
Marc Alff committed
2548
    mysql_mutex_lock(&LOCK_active_mi);
2549
    start_slave(thd,active_mi,1 /* net report*/);
Marc Alff's avatar
Marc Alff committed
2550
    mysql_mutex_unlock(&LOCK_active_mi);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2551
    break;
2552
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2553
  case SQLCOM_SLAVE_STOP:
2554 2555 2556 2557 2558 2559
  /*
    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,
2560
      so it waits for the client thread because t is locked by it.
2561
    - then the client thread does SLAVE STOP.
2562 2563
      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.
2564 2565 2566
    To prevent that, refuse SLAVE STOP if the
    client thread has locked tables
  */
Konstantin Osipov's avatar
Konstantin Osipov committed
2567
  if (thd->locked_tables_mode ||
2568
      thd->active_transaction() || thd->global_read_lock.is_acquired())
2569
  {
2570 2571
    my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
               ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
2572
    goto error;
2573
  }
2574
  {
Marc Alff's avatar
Marc Alff committed
2575
    mysql_mutex_lock(&LOCK_active_mi);
2576
    stop_slave(thd,active_mi,1/* net report*/);
Marc Alff's avatar
Marc Alff committed
2577
    mysql_mutex_unlock(&LOCK_active_mi);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2578
    break;
2579
  }
2580
#endif /* HAVE_REPLICATION */
2581

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2582
  case SQLCOM_ALTER_TABLE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2583
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2584
    {
2585
      ulong priv=0;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
2586
      ulong priv_needed= ALTER_ACL;
2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597
      /*
        Code in mysql_alter_table() may modify its HA_CREATE_INFO argument,
        so we have to use a copy of this structure to make execution
        prepared statement- safe. A shallow copy is enough as no memory
        referenced from this structure will be modified.
      */
      HA_CREATE_INFO create_info(lex->create_info);
      Alter_info alter_info(lex->alter_info, thd->mem_root);

      if (thd->is_fatal_error) /* out of memory creating a copy of alter_info */
        goto error;
2598 2599 2600 2601
      /*
        We also require DROP priv for ALTER TABLE ... DROP PARTITION, as well
        as for RENAME TO, as being done by SQLCOM_RENAME_TABLE
      */
2602
      if (alter_info.flags & (ALTER_DROP_PARTITION | ALTER_RENAME))
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
2603 2604
        priv_needed|= DROP_ACL;

2605 2606
      /* Must be set in the parser */
      DBUG_ASSERT(select_lex->db);
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
2607
      if (check_access(thd, priv_needed, first_table->db,
Marc Alff's avatar
Marc Alff committed
2608 2609 2610 2611 2612 2613 2614
                       &first_table->grant.privilege,
                       &first_table->grant.m_internal,
                       0, 0) ||
          check_access(thd, INSERT_ACL | CREATE_ACL, select_lex->db,
                       &priv,
                       NULL, /* Do not use first_table->grant with select_lex->db */
                       0, 0) ||
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2615
	  check_merge_table_access(thd, first_table->db,
2616
				   (TABLE_LIST *)
2617
				   create_info.merge_list.first))
2618
	goto error;				/* purecov: inspected */
2619
      if (check_grant(thd, priv_needed, all_tables, FALSE, UINT_MAX, FALSE))
2620 2621 2622 2623 2624 2625 2626 2627
        goto error;
      if (lex->name.str && !test_all_bits(priv,INSERT_ACL | CREATE_ACL))
      { // Rename of table
          TABLE_LIST tmp_table;
          bzero((char*) &tmp_table,sizeof(tmp_table));
          tmp_table.table_name= lex->name.str;
          tmp_table.db=select_lex->db;
          tmp_table.grant.privilege=priv;
2628 2629
          if (check_grant(thd, INSERT_ACL | CREATE_ACL, &tmp_table, FALSE,
              UINT_MAX, FALSE))
2630
            goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2631
      }
2632

2633
      /* Don't yet allow changing of symlinks with ALTER TABLE */
2634
      if (create_info.data_file_name)
2635 2636 2637
        push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                            WARN_OPTION_IGNORED, ER(WARN_OPTION_IGNORED),
                            "DATA DIRECTORY");
2638
      if (create_info.index_file_name)
2639 2640 2641
        push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                            WARN_OPTION_IGNORED, ER(WARN_OPTION_IGNORED),
                            "INDEX DIRECTORY");
2642
      create_info.data_file_name= create_info.index_file_name= NULL;
2643 2644

      thd->enable_slow_log= opt_log_slow_admin_statements;
2645
      res= mysql_alter_table(thd, select_lex->db, lex->name.str,
2646 2647 2648
                             &create_info,
                             first_table,
                             &alter_info,
2649 2650
                             select_lex->order_list.elements,
                             (ORDER *) select_lex->order_list.first,
2651
                             lex->ignore);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2652 2653
      break;
    }
2654
  case SQLCOM_RENAME_TABLE:
2655
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2656
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2657
    TABLE_LIST *table;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2658
    for (table= first_table; table; table= table->next_local->next_local)
2659
    {
monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
2660
      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
Marc Alff's avatar
Marc Alff committed
2661 2662 2663 2664 2665 2666 2667
                       &table->grant.privilege,
                       &table->grant.m_internal,
                       0, 0) ||
          check_access(thd, INSERT_ACL | CREATE_ACL, table->next_local->db,
                       &table->next_local->grant.privilege,
                       &table->next_local->grant.m_internal,
                       0, 0))
2668
	goto error;
2669 2670 2671 2672 2673 2674 2675
      TABLE_LIST old_list, new_list;
      /*
        we do not need initialize old_list and new_list because we will
        come table[0] and table->next[0] there
      */
      old_list= table[0];
      new_list= table->next_local[0];
2676
      if (check_grant(thd, ALTER_ACL | DROP_ACL, &old_list, FALSE, 1, FALSE) ||
2677 2678
         (!test_all_bits(table->next_local->grant.privilege,
                         INSERT_ACL | CREATE_ACL) &&
2679 2680
          check_grant(thd, INSERT_ACL | CREATE_ACL, &new_list, FALSE, 1,
                      FALSE)))
2681
        goto error;
2682
    }
2683

Konstantin Osipov's avatar
Konstantin Osipov committed
2684
    if (mysql_rename_tables(thd, first_table, 0))
2685
      goto error;
2686
    break;
2687
  }
2688
#ifndef EMBEDDED_LIBRARY
2689 2690
  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2691 2692
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
2693
    goto error;
2694 2695
#else
    {
2696
      if (check_global_access(thd, SUPER_ACL))
2697 2698 2699 2700
	goto error;
      res = show_binlogs(thd);
      break;
    }
peter@mysql.com's avatar
peter@mysql.com committed
2701
#endif
2702
#endif /* EMBEDDED_LIBRARY */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2703
  case SQLCOM_SHOW_CREATE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2704
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2705
#ifdef DONT_ALLOW_SHOW_COMMANDS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2706 2707
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
2708
    goto error;
2709
#else
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2710
    {
2711 2712 2713 2714 2715 2716 2717 2718 2719
     /*
        Access check:
        SHOW CREATE TABLE require any privileges on the table level (ie
        effecting all columns in the table).
        SHOW CREATE VIEW require the SHOW_VIEW and SELECT ACLs on the table
        level.
        NOTE: SHOW_VIEW ACL is checked when the view is created.
      */

2720
      if (lex->only_view)
2721 2722 2723 2724 2725 2726 2727 2728 2729 2730
      {
        if (check_table_access(thd, SELECT_ACL, first_table, FALSE, 1, FALSE))
        {
          my_error(ER_TABLEACCESS_DENIED_ERROR, MYF(0),
                  "SHOW", thd->security_ctx->priv_user,
                  thd->security_ctx->host_or_ip, first_table->alias);
          goto error;
        }

        /* Ignore temporary tables if this is "SHOW CREATE VIEW" */
2731 2732
        first_table->open_type= OT_BASE_ONLY;

2733 2734 2735 2736
      }
      else
      {
        /*
Marc Alff's avatar
Marc Alff committed
2737 2738 2739
          The fact that check_some_access() returned FALSE does not mean that
          access is granted. We need to check if first_table->grant.privilege
          contains any table-specific privilege.
2740
        */
Marc Alff's avatar
Marc Alff committed
2741 2742
        if (check_some_access(thd, SHOW_CREATE_TABLE_ACLS, first_table) ||
            (first_table->grant.privilege & SHOW_CREATE_TABLE_ACLS) == 0)
2743 2744 2745 2746 2747 2748 2749 2750
        {
          my_error(ER_TABLEACCESS_DENIED_ERROR, MYF(0),
                  "SHOW", thd->security_ctx->priv_user,
                  thd->security_ctx->host_or_ip, first_table->alias);
          goto error;
        }
      }

2751
      /* Access is granted. Execute the command.  */
monty@mishka.local's avatar
monty@mishka.local committed
2752
      res= mysqld_show_create(thd, first_table);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2753 2754
      break;
    }
2755
#endif
2756 2757
  case SQLCOM_CHECKSUM:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2758
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2759 2760
    if (check_table_access(thd, SELECT_ACL, all_tables,
                           FALSE, UINT_MAX, FALSE))
2761
      goto error; /* purecov: inspected */
2762

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2763
    res = mysql_checksum_table(thd, first_table, &lex->check_opt);
2764 2765
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2766
  case SQLCOM_REPAIR:
2767
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2768
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2769
    if (check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables,
2770
                           FALSE, UINT_MAX, FALSE))
2771
      goto error; /* purecov: inspected */
2772
    thd->enable_slow_log= opt_log_slow_admin_statements;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2773
    res= mysql_repair_table(thd, first_table, &lex->check_opt);
2774 2775 2776
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
2777 2778 2779
      /*
        Presumably, REPAIR and binlog writing doesn't require synchronization
      */
2780
      res= write_bin_log(thd, TRUE, thd->query(), thd->query_length());
2781
    }
2782
    select_lex->table_list.first= (uchar*) first_table;
2783
    lex->query_tables=all_tables;
2784 2785
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2786
  case SQLCOM_CHECK:
2787
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2788
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2789 2790
    if (check_table_access(thd, SELECT_ACL, all_tables,
                           TRUE, UINT_MAX, FALSE))
2791
      goto error; /* purecov: inspected */
2792
    thd->enable_slow_log= opt_log_slow_admin_statements;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2793
    res = mysql_check_table(thd, first_table, &lex->check_opt);
2794
    select_lex->table_list.first= (uchar*) first_table;
2795
    lex->query_tables=all_tables;
2796 2797
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2798 2799
  case SQLCOM_ANALYZE:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2800
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2801
    if (check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables,
2802
                           FALSE, UINT_MAX, FALSE))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2803
      goto error; /* purecov: inspected */
2804
    thd->enable_slow_log= opt_log_slow_admin_statements;
2805
    res= mysql_analyze_table(thd, first_table, &lex->check_opt);
2806 2807 2808
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
2809 2810 2811
      /*
        Presumably, ANALYZE and binlog writing doesn't require synchronization
      */
2812
      res= write_bin_log(thd, TRUE, thd->query(), thd->query_length());
2813
    }
2814
    select_lex->table_list.first= (uchar*) first_table;
2815
    lex->query_tables=all_tables;
2816
    break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2817
  }
2818

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2819 2820
  case SQLCOM_OPTIMIZE:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2821
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2822
    if (check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables,
2823
                           FALSE, UINT_MAX, FALSE))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2824
      goto error; /* purecov: inspected */
2825
    thd->enable_slow_log= opt_log_slow_admin_statements;
2826
    res= (specialflag & (SPECIAL_SAFE_MODE | SPECIAL_NO_NEW_FUNC)) ?
2827
      mysql_recreate_table(thd, first_table) :
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2828
      mysql_optimize_table(thd, first_table, &lex->check_opt);
2829 2830 2831
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
2832 2833 2834
      /*
        Presumably, OPTIMIZE and binlog writing doesn't require synchronization
      */
2835
      res= write_bin_log(thd, TRUE, thd->query(), thd->query_length());
2836
    }
2837
    select_lex->table_list.first= (uchar*) first_table;
2838
    lex->query_tables=all_tables;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2839 2840 2841
    break;
  }
  case SQLCOM_UPDATE:
2842 2843
  {
    ha_rows found= 0, updated= 0;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2844 2845
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (update_precheck(thd, all_tables))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2846
      break;
2847 2848
    DBUG_ASSERT(select_lex->offset_limit == 0);
    unit->set_limit(select_lex);
2849
    MYSQL_UPDATE_START(thd->query());
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
2850 2851 2852 2853 2854 2855 2856
    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,
2857 2858 2859
                                  lex->duplicates, lex->ignore,
                                  &found, &updated));
    MYSQL_UPDATE_DONE(res, found, updated);
2860
    /* mysql_update return 2 if we need to switch to multi-update */
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
2861
    if (up_result != 2)
2862
      break;
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
2863
    /* Fall through */
2864
  }
2865
  case SQLCOM_UPDATE_MULTI:
2866 2867 2868
  {
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    /* if we switched from normal update, rights are checked */
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
2869
    if (up_result != 2)
2870
    {
2871 2872 2873 2874 2875
      if ((res= multi_update_precheck(thd, all_tables)))
        break;
    }
    else
      res= 0;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2876

2877
    res= mysql_multi_update_prepare(thd);
2878

2879
#ifdef HAVE_REPLICATION
2880
    /* Check slave filtering rules */
2881
    if (unlikely(thd->slave_thread && !have_table_map_for_update))
2882
    {
2883 2884
      if (all_tables_not_ok(thd, all_tables))
      {
2885 2886 2887 2888 2889
        if (res!= 0)
        {
          res= 0;             /* don't care of prev failure  */
          thd->clear_error(); /* filters are of highest prior */
        }
2890 2891 2892 2893
        /* we warn the slave SQL thread */
        my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
        break;
      }
2894 2895
      if (res)
        break;
2896
    }
2897 2898
    else
    {
2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911
#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
2912 2913
    {
      multi_update *result_obj;
2914
      MYSQL_MULTI_UPDATE_START(thd->query());
2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936
      res= mysql_multi_update(thd, all_tables,
                              &select_lex->item_list,
                              &lex->value_list,
                              select_lex->where,
                              select_lex->options,
                              lex->duplicates,
                              lex->ignore,
                              unit,
                              select_lex,
                              &result_obj);
      if (result_obj)
      {
        MYSQL_MULTI_UPDATE_DONE(res, result_obj->num_found(),
                                result_obj->num_updated());
        res= FALSE; /* Ignore errors here */
        delete result_obj;
      }
      else
      {
        MYSQL_MULTI_UPDATE_DONE(1, 0, 0);
      }
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2937
    break;
monty@mysql.com's avatar
monty@mysql.com committed
2938
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2939
  case SQLCOM_REPLACE:
2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963
#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);
2964
        (void) mysql_bin_log.write(&ev);        /* error is ignored */
2965 2966 2967 2968 2969
        mysql_bin_log.rotate_and_purge(RP_FORCE_ROTATE);
      }
      DBUG_PRINT("debug", ("Just after generate_incident()"));
    }
#endif
2970 2971
  case SQLCOM_INSERT:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2972
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
monty@mysql.com's avatar
monty@mysql.com committed
2973
    if ((res= insert_precheck(thd, all_tables)))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2974
      break;
2975

2976
    MYSQL_INSERT_START(thd->query());
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2977
    res= mysql_insert(thd, all_tables, lex->field_list, lex->many_values,
monty@mishka.local's avatar
monty@mishka.local committed
2978
		      lex->update_list, lex->value_list,
2979
                      lex->duplicates, lex->ignore);
2980
    MYSQL_INSERT_DONE(res, (ulong) thd->row_count_func);
2981 2982 2983 2984 2985 2986
    /*
      If we have inserted into a VIEW, and the base table has
      AUTO_INCREMENT column, but this column is not accessible through
      a view, then we should restore LAST_INSERT_ID to the value it
      had before the statement.
    */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2987
    if (first_table->view && !first_table->contain_auto_increment)
2988 2989
      thd->first_successful_insert_id_in_cur_stmt=
        thd->first_successful_insert_id_in_prev_stmt;
2990

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2991
    break;
2992
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2993 2994 2995
  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
2996
    select_result *sel_result;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2997
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
monty@mishka.local's avatar
monty@mishka.local committed
2998
    if ((res= insert_precheck(thd, all_tables)))
2999
      break;
monty@mysql.com's avatar
monty@mysql.com committed
3000

3001
    /* Fix lock for first table */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3002 3003
    if (first_table->lock_type == TL_WRITE_DELAYED)
      first_table->lock_type= TL_WRITE;
3004

3005 3006
    /* Don't unlock tables until command is written to binary log */
    select_lex->options|= SELECT_NO_UNLOCK;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3007

3008
    unit->set_limit(select_lex);
3009

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3010
    if (!(res= open_and_lock_tables(thd, all_tables)))
3011
    {
3012
      MYSQL_INSERT_SELECT_START(thd->query());
3013
      /* Skip first table, which is the table we are inserting in */
3014
      TABLE_LIST *second_table= first_table->next_local;
3015
      select_lex->table_list.first= (uchar*) second_table;
3016 3017
      select_lex->context.table_list= 
        select_lex->context.first_name_resolution_table= second_table;
3018
      res= mysql_insert_select_prepare(thd);
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
3019 3020 3021 3022 3023 3024 3025
      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)))
3026
      {
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
3027
	res= handle_select(thd, lex, sel_result, OPTION_SETUP_TABLES_DONE);
3028 3029 3030 3031 3032 3033 3034 3035 3036
        /*
          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)
        {
3037 3038 3039
          /* INSERT ... SELECT should invalidate only the very first table */
          TABLE_LIST *save_table= first_table->next_local;
          first_table->next_local= 0;
3040
          query_cache_invalidate3(thd, first_table, 1);
3041
          first_table->next_local= save_table;
3042
        }
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
3043
        delete sel_result;
3044
      }
3045
      /* revert changes for SP */
3046
      MYSQL_INSERT_SELECT_DONE(res, (ulong) thd->row_count_func);
3047
      select_lex->table_list.first= (uchar*) first_table;
3048
    }
3049 3050 3051 3052 3053 3054
    /*
      If we have inserted into a VIEW, and the base table has
      AUTO_INCREMENT column, but this column is not accessible through
      a view, then we should restore LAST_INSERT_ID to the value it
      had before the statement.
    */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3055
    if (first_table->view && !first_table->contain_auto_increment)
3056 3057
      thd->first_successful_insert_id_in_cur_stmt=
        thd->first_successful_insert_id_in_prev_stmt;
3058

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3059 3060
    break;
  }
3061
  case SQLCOM_TRUNCATE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3062
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
3063
    if (check_one_table_access(thd, DROP_ACL, all_tables))
3064
      goto error;
3065 3066 3067 3068
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
Konstantin Osipov's avatar
Konstantin Osipov committed
3069
    if (thd->active_transaction())
3070
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3071 3072
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3073 3074
      goto error;
    }
3075
    if (thd->global_read_lock.wait_if_global_read_lock(thd, FALSE, TRUE))
3076
      goto error;
monty@mysql.com's avatar
monty@mysql.com committed
3077
    res= mysql_truncate(thd, first_table, 0);
3078
    break;
3079
  case SQLCOM_DELETE:
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3080
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3081 3082
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if ((res= delete_precheck(thd, all_tables)))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3083
      break;
3084 3085
    DBUG_ASSERT(select_lex->offset_limit == 0);
    unit->set_limit(select_lex);
3086

3087
    MYSQL_DELETE_START(thd->query());
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3088
    res = mysql_delete(thd, all_tables, select_lex->where,
3089
                       &select_lex->order_list,
osku@127.(none)'s avatar
osku@127.(none) committed
3090 3091
                       unit->select_limit_cnt, select_lex->options,
                       FALSE);
3092
    MYSQL_DELETE_DONE(res, (ulong) thd->row_count_func);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3093 3094
    break;
  }
3095
  case SQLCOM_DELETE_MULTI:
3096
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3097
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3098
    TABLE_LIST *aux_tables=
3099
      (TABLE_LIST *)thd->lex->auxiliary_table_list.first;
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
3100
    multi_delete *del_result;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3101

3102
    if ((res= multi_delete_precheck(thd, all_tables)))
3103
      break;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3104

3105
    /* condition will be TRUE on SP re-excuting */
3106 3107
    if (select_lex->item_list.elements != 0)
      select_lex->item_list.empty();
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
3108
    if (add_item_to_list(thd, new Item_null()))
3109
      goto error;
3110

3111
    thd_proc_info(thd, "init");
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3112 3113 3114
    if ((res= open_and_lock_tables(thd, all_tables)))
      break;

3115
    MYSQL_MULTI_DELETE_START(thd->query());
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3116
    if ((res= mysql_multi_delete_prepare(thd)))
3117 3118
    {
      MYSQL_MULTI_DELETE_DONE(1, 0);
3119
      goto error;
3120
    }
3121

malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
3122 3123
    if (!thd->is_fatal_error &&
        (del_result= new multi_delete(aux_tables, lex->table_count)))
3124
    {
3125 3126 3127
      res= mysql_select(thd, &select_lex->ref_pointer_array,
			select_lex->get_table_list(),
			select_lex->with_wild,
3128
			select_lex->item_list,
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3129
			select_lex->where,
3130
			0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3131
			(ORDER *)NULL,
3132
			(select_lex->options | thd->variables.option_bits |
3133
			SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK |
3134
                        OPTION_SETUP_TABLES_DONE) & ~OPTION_BUFFER_RESULT,
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
3135
			del_result, unit, select_lex);
3136
      res|= thd->is_error();
3137
      MYSQL_MULTI_DELETE_DONE(res, del_result->num_deleted());
3138
      if (res)
3139
        del_result->abort();
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
3140
      delete del_result;
3141 3142
    }
    else
3143
    {
3144
      res= TRUE;                                // Error
3145 3146
      MYSQL_MULTI_DELETE_DONE(1, 0);
    }
3147 3148
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3149
  case SQLCOM_DROP_TABLE:
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
3150
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3151
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3152 3153
    if (!lex->drop_temporary)
    {
3154
      if (check_table_access(thd, DROP_ACL, all_tables, FALSE, UINT_MAX, FALSE))
3155 3156
	goto error;				/* purecov: inspected */
    }
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
3157
    else
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
3158
    {
3159
      /* So that DROP TEMPORARY TABLE gets to binlog at commit/rollback */
3160
      thd->variables.option_bits|= OPTION_KEEP_LOG;
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
3161
    }
3162
    /* DDL and binlog write order protected by LOCK_open */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3163 3164
    res= mysql_rm_table(thd, first_table, lex->drop_if_exists,
			lex->drop_temporary);
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
3165 3166
  }
  break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3167
  case SQLCOM_SHOW_PROCESSLIST:
3168 3169
    if (!thd->security_ctx->priv_user[0] &&
        check_global_access(thd,PROCESS_ACL))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3170
      break;
hf@deer.(none)'s avatar
hf@deer.(none) committed
3171
    mysqld_list_processes(thd,
3172 3173 3174 3175
			  (thd->security_ctx->master_access & PROCESS_ACL ?
                           NullS :
                           thd->security_ctx->priv_user),
                          lex->verbose);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3176
    break;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3177 3178 3179
  case SQLCOM_SHOW_AUTHORS:
    res= mysqld_show_authors(thd);
    break;
3180 3181 3182
  case SQLCOM_SHOW_CONTRIBUTORS:
    res= mysqld_show_contributors(thd);
    break;
3183 3184 3185
  case SQLCOM_SHOW_PRIVILEGES:
    res= mysqld_show_privileges(thd);
    break;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3186
  case SQLCOM_SHOW_ENGINE_LOGS:
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
3187
#ifdef DONT_ALLOW_SHOW_COMMANDS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3188 3189
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0));	/* purecov: inspected */
3190
    goto error;
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
3191 3192
#else
    {
Marc Alff's avatar
Marc Alff committed
3193
      if (check_access(thd, FILE_ACL, any_db, NULL, NULL, 0, 0))
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
3194
	goto error;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3195
      res= ha_show_status(thd, lex->create_info.db_type, HA_ENGINE_LOGS);
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
3196 3197
      break;
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3198 3199
#endif
  case SQLCOM_CHANGE_DB:
3200 3201 3202 3203
  {
    LEX_STRING db_str= { (char *) select_lex->db, strlen(select_lex->db) };

    if (!mysql_change_db(thd, &db_str, FALSE))
3204
      my_ok(thd);
3205

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3206
    break;
3207
  }
3208

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3209 3210
  case SQLCOM_LOAD:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3211
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3212
    uint privilege= (lex->duplicates == DUP_REPLACE ?
3213 3214
		     INSERT_ACL | DELETE_ACL : INSERT_ACL) |
                    (lex->local_file ? 0 : FILE_ACL);
3215

3216
    if (lex->local_file)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3217
    {
3218
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
3219
          !opt_local_infile)
3220
      {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3221
	my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND), MYF(0));
3222 3223
	goto error;
      }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3224
    }
3225 3226 3227 3228

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

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3229
    res= mysql_load(thd, lex->exchange, first_table, lex->field_list,
3230
                    lex->update_list, lex->value_list, lex->duplicates,
3231
                    lex->ignore, (bool) lex->local_file);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3232 3233
    break;
  }
3234

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3235
  case SQLCOM_SET_OPTION:
3236 3237
  {
    List<set_var_base> *lex_var_list= &lex->var_list;
3238

3239 3240
    if ((check_table_access(thd, SELECT_ACL, all_tables, FALSE, UINT_MAX, FALSE)
         || open_and_lock_tables(thd, all_tables)))
3241
      goto error;
3242 3243 3244 3245 3246 3247 3248
    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;
3249
      my_ok(thd);
3250
    }
3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262
    else
    {
      /*
        We encountered some sort of error, but no message was sent.
        Send something semi-generic here since we don't know which
        assignment in the list caused the error.
      */
      if (!thd->is_error())
        my_error(ER_WRONG_ARGUMENTS,MYF(0),"SET");
      goto error;
    }

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3263
    break;
3264
  }
3265

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3266
  case SQLCOM_UNLOCK_TABLES:
3267 3268 3269 3270 3271 3272
    /*
      It is critical for mysqldump --single-transaction --master-data that
      UNLOCK TABLES does not implicitely commit a connection which has only
      done FLUSH TABLES WITH READ LOCK + BEGIN. If this assumption becomes
      false, mysqldump will not work.
    */
Konstantin Osipov's avatar
Konstantin Osipov committed
3273
    thd->locked_tables_list.unlock_locked_tables(thd);
3274
    if (thd->variables.option_bits & OPTION_TABLE_LOCK)
3275
    {
Konstantin Osipov's avatar
Konstantin Osipov committed
3276
      trans_commit_implicit(thd);
3277
      thd->mdl_context.release_transactional_locks();
3278
      thd->variables.option_bits&= ~(OPTION_TABLE_LOCK);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3279
    }
3280 3281
    if (thd->global_read_lock.is_acquired())
      thd->global_read_lock.unlock_global_read_lock(thd);
3282
    my_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3283 3284
    break;
  case SQLCOM_LOCK_TABLES:
Konstantin Osipov's avatar
Konstantin Osipov committed
3285
    thd->locked_tables_list.unlock_locked_tables(thd);
3286 3287 3288 3289 3290 3291 3292 3293
    /*
      As of 5.5, entering LOCK TABLES mode implicitly closes all
      open HANDLERs. Both HANDLER code and LOCK TABLES mode use
      the sentinel mechanism in MDL subsystem and thus could not be
      used at the same time. All HANDLER operations are prohibited
      under LOCK TABLES anyway.
    */
    mysql_ha_cleanup(thd);
3294
    /* we must end the trasaction first, regardless of anything */
Konstantin Osipov's avatar
Konstantin Osipov committed
3295
    if (trans_commit_implicit(thd))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3296
      goto error;
3297
    /* release transactional metadata locks. */
3298
    thd->mdl_context.release_transactional_locks();
3299
    if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, all_tables,
3300
                           FALSE, UINT_MAX, FALSE))
3301
      goto error;
3302
    if (lex->protect_against_global_read_lock &&
3303
        thd->global_read_lock.wait_if_global_read_lock(thd, FALSE, TRUE))
3304
      goto error;
Konstantin Osipov's avatar
Konstantin Osipov committed
3305

Konstantin Osipov's avatar
Konstantin Osipov committed
3306
    init_mdl_requests(all_tables);
Konstantin Osipov's avatar
Konstantin Osipov committed
3307

3308
    thd->variables.option_bits|= OPTION_TABLE_LOCK;
Konstantin Osipov's avatar
Konstantin Osipov committed
3309
    thd->in_lock_tables=1;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3310

Konstantin Osipov's avatar
Konstantin Osipov committed
3311 3312 3313 3314 3315 3316 3317 3318
    {
      Lock_tables_prelocking_strategy lock_tables_prelocking_strategy;

      res= (open_and_lock_tables_derived(thd, all_tables, FALSE,
                                         MYSQL_OPEN_TAKE_UPGRADABLE_MDL,
                                         &lock_tables_prelocking_strategy) ||
            thd->locked_tables_list.init_locked_tables(thd));
    }
Konstantin Osipov's avatar
Konstantin Osipov committed
3319 3320 3321 3322

    thd->in_lock_tables= 0;

    if (res)
3323
    {
Konstantin Osipov's avatar
Konstantin Osipov committed
3324
      /*
3325 3326 3327 3328
        Need to end the current transaction, so the storage engine (InnoDB)
        can free its locks if LOCK TABLES locked some tables before finding
        that it can't lock a table in its list
      */
Konstantin Osipov's avatar
Konstantin Osipov committed
3329 3330
      trans_rollback_stmt(thd);
      trans_commit_implicit(thd);
3331 3332 3333 3334 3335 3336
      /*
        Close tables and release metadata locks otherwise a later call to
        close_thread_tables might not release the locks if autocommit is off.
      */
      close_thread_tables(thd);
      DBUG_ASSERT(!thd->locked_tables_mode);
3337
      thd->mdl_context.release_transactional_locks();
3338
      thd->variables.option_bits&= ~(OPTION_TABLE_LOCK);
3339
    }
Konstantin Osipov's avatar
Konstantin Osipov committed
3340 3341 3342 3343 3344 3345 3346 3347
    else
    {
#ifdef HAVE_QUERY_CACHE
      if (thd->variables.query_cache_wlock_invalidate)
        query_cache.invalidate_locked_for_write(first_table);
#endif /*HAVE_QUERY_CACHE*/
      my_ok(thd);
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3348 3349
    break;
  case SQLCOM_CREATE_DB:
3350
  {
3351 3352 3353 3354 3355 3356
    /*
      As mysql_create_db() may modify HA_CREATE_INFO structure passed to
      it, we need to use a copy of LEX::create_info to make execution
      prepared statement- safe.
    */
    HA_CREATE_INFO create_info(lex->create_info);
3357
    char *alias;
3358 3359
    if (!(alias=thd->strmake(lex->name.str, lex->name.length)) ||
        check_db_name(&lex->name))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3360
    {
3361
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name.str);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3362 3363
      break;
    }
3364 3365 3366
    /*
      If in a slave thread :
      CREATE DATABASE DB was certainly not preceded by USE DB.
3367
      For that reason, db_ok() in sql/slave.cc did not check the
3368 3369 3370
      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.
    */
3371
#ifdef HAVE_REPLICATION
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3372
    if (thd->slave_thread && 
3373 3374
	(!rpl_filter->db_ok(lex->name.str) ||
	 !rpl_filter->db_ok_with_wild_table(lex->name.str)))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3375
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3376
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
3377
      break;
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3378
    }
3379
#endif
Marc Alff's avatar
Marc Alff committed
3380
    if (check_access(thd, CREATE_ACL, lex->name.str, NULL, NULL, 1, 0))
3381
      break;
3382 3383 3384 3385 3386 3387
    if (thd->locked_tables_mode)
    {
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
      goto error;
    }
3388
    res= mysql_create_db(thd,(lower_case_table_names == 2 ? alias :
3389
                              lex->name.str), &create_info, 0);
3390 3391
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3392
  case SQLCOM_DROP_DB:
3393
  {
3394
    if (check_db_name(&lex->name))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3395
    {
3396
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name.str);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3397 3398
      break;
    }
3399 3400 3401 3402 3403 3404 3405
    /*
      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.
    */
3406
#ifdef HAVE_REPLICATION
3407
    if (thd->slave_thread && 
3408 3409
	(!rpl_filter->db_ok(lex->name.str) ||
	 !rpl_filter->db_ok_with_wild_table(lex->name.str)))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3410
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3411
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
3412
      break;
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3413
    }
3414
#endif
Marc Alff's avatar
Marc Alff committed
3415
    if (check_access(thd, DROP_ACL, lex->name.str, NULL, NULL, 1, 0))
3416
      break;
3417
    if (thd->locked_tables_mode)
3418
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3419 3420
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3421 3422
      goto error;
    }
3423
    res= mysql_rm_db(thd, lex->name.str, lex->drop_if_exists, 0);
3424 3425
    break;
  }
3426
  case SQLCOM_ALTER_DB_UPGRADE:
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3427
  {
3428
    LEX_STRING *db= & lex->name;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3429 3430
#ifdef HAVE_REPLICATION
    if (thd->slave_thread && 
3431 3432
       (!rpl_filter->db_ok(db->str) ||
        !rpl_filter->db_ok_with_wild_table(db->str)))
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3433 3434 3435 3436 3437 3438
    {
      res= 1;
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
      break;
    }
#endif
3439
    if (check_db_name(db))
3440
    {
3441
      my_error(ER_WRONG_DB_NAME, MYF(0), db->str);
3442 3443
      break;
    }
Marc Alff's avatar
Marc Alff committed
3444 3445 3446
    if (check_access(thd, ALTER_ACL, db->str, NULL, NULL, 1, 0) ||
        check_access(thd, DROP_ACL, db->str, NULL, NULL, 1, 0) ||
        check_access(thd, CREATE_ACL, db->str, NULL, NULL, 1, 0))
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3447 3448 3449 3450
    {
      res= 1;
      break;
    }
3451
    if (thd->locked_tables_mode)
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3452 3453 3454 3455 3456 3457
    {
      res= 1;
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
      goto error;
    }
3458 3459

    res= mysql_upgrade_db(thd, db);
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3460
    if (!res)
3461
      my_ok(thd);
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3462 3463
    break;
  }
3464 3465
  case SQLCOM_ALTER_DB:
  {
3466
    LEX_STRING *db= &lex->name;
3467
    HA_CREATE_INFO create_info(lex->create_info);
3468
    if (check_db_name(db))
3469
    {
3470
      my_error(ER_WRONG_DB_NAME, MYF(0), db->str);
3471 3472
      break;
    }
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3473 3474 3475
    /*
      If in a slave thread :
      ALTER DATABASE DB may not be preceded by USE DB.
3476
      For that reason, maybe db_ok() in sql/slave.cc did not check the
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3477 3478 3479 3480
      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
3481
    if (thd->slave_thread &&
3482 3483
	(!rpl_filter->db_ok(db->str) ||
	 !rpl_filter->db_ok_with_wild_table(db->str)))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3484
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3485
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3486 3487 3488
      break;
    }
#endif
Marc Alff's avatar
Marc Alff committed
3489
    if (check_access(thd, ALTER_ACL, db->str, NULL, NULL, 1, 0))
3490
      break;
3491
    if (thd->locked_tables_mode)
3492
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3493 3494
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3495 3496
      goto error;
    }
3497
    res= mysql_alter_db(thd, db->str, &create_info);
3498 3499
    break;
  }
3500 3501
  case SQLCOM_SHOW_CREATE_DB:
  {
gshchepa/uchum@gleb.loc's avatar
gshchepa/uchum@gleb.loc committed
3502 3503
    DBUG_EXECUTE_IF("4x_server_emul",
                    my_error(ER_UNKNOWN_ERROR, MYF(0)); goto error;);
3504
    if (check_db_name(&lex->name))
3505
    {
3506
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name.str);
3507 3508
      break;
    }
3509
    res= mysqld_show_create_db(thd, lex->name.str, &lex->create_info);
3510 3511
    break;
  }
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3512 3513
  case SQLCOM_CREATE_EVENT:
  case SQLCOM_ALTER_EVENT:
3514
  #ifdef HAVE_EVENT_SCHEDULER
3515
  do
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3516
  {
3517
    DBUG_ASSERT(lex->event_parse_data);
3518 3519 3520 3521 3522 3523
    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;
    }
3524 3525 3526 3527 3528

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

3529 3530
    switch (lex->sql_command) {
    case SQLCOM_CREATE_EVENT:
3531 3532 3533 3534
    {
      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);
3535
      break;
3536
    }
3537
    case SQLCOM_ALTER_EVENT:
3538 3539 3540
      res= Events::update_event(thd, lex->event_parse_data,
                                lex->spname ? &lex->spname->m_db : NULL,
                                lex->spname ? &lex->spname->m_name : NULL);
3541
      break;
3542 3543
    default:
      DBUG_ASSERT(0);
3544
    }
3545
    DBUG_PRINT("info",("DDL error code=%d", res));
3546
    if (!res)
3547
      my_ok(thd);
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3548

3549 3550 3551 3552 3553 3554
  } while (0);
  /* Don't do it, if we are inside a SP */
  if (!thd->spcont)
  {
    delete lex->sphead;
    lex->sphead= NULL;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3555
  }
3556 3557
  /* lex->unit.cleanup() is called outside, no need to call it here */
  break;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3558
  case SQLCOM_SHOW_CREATE_EVENT:
3559 3560 3561 3562 3563 3564 3565
    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)))
3566
      my_ok(thd);
3567
    break;
3568 3569 3570 3571
#else
    my_error(ER_NOT_SUPPORTED_YET,MYF(0),"embedded server");
    break;
#endif
monty@mysql.com's avatar
monty@mysql.com committed
3572
  case SQLCOM_CREATE_FUNCTION:                  // UDF function
monty@mysql.com's avatar
monty@mysql.com committed
3573
  {
Marc Alff's avatar
Marc Alff committed
3574
    if (check_access(thd, INSERT_ACL, "mysql", NULL, NULL, 1, 0))
monty@mysql.com's avatar
monty@mysql.com committed
3575
      break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3576
#ifdef HAVE_DLOPEN
3577
    if (!(res = mysql_create_function(thd, &lex->udf)))
3578
      my_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3579
#else
hf@deer.(none)'s avatar
hf@deer.(none) committed
3580
    my_error(ER_CANT_OPEN_LIBRARY, MYF(0), lex->udf.dl, 0, "feature disabled");
3581
    res= TRUE;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3582 3583
#endif
    break;
monty@mysql.com's avatar
monty@mysql.com committed
3584
  }
hf@deer.(none)'s avatar
hf@deer.(none) committed
3585
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3586 3587
  case SQLCOM_CREATE_USER:
  {
Marc Alff's avatar
Marc Alff committed
3588
    if (check_access(thd, INSERT_ACL, "mysql", NULL, NULL, 1, 1) &&
3589
        check_global_access(thd,CREATE_USER_ACL))
3590
      break;
3591
    /* Conditionally writes to binlog */
3592
    if (!(res= mysql_create_user(thd, lex->users_list)))
3593
      my_ok(thd);
3594 3595
    break;
  }
3596 3597
  case SQLCOM_DROP_USER:
  {
Marc Alff's avatar
Marc Alff committed
3598
    if (check_access(thd, DELETE_ACL, "mysql", NULL, NULL, 1, 1) &&
3599
        check_global_access(thd,CREATE_USER_ACL))
3600
      break;
3601
    /* Conditionally writes to binlog */
3602
    if (!(res= mysql_drop_user(thd, lex->users_list)))
3603
      my_ok(thd);
3604 3605 3606 3607
    break;
  }
  case SQLCOM_RENAME_USER:
  {
Marc Alff's avatar
Marc Alff committed
3608
    if (check_access(thd, UPDATE_ACL, "mysql", NULL, NULL, 1, 1) &&
3609
        check_global_access(thd,CREATE_USER_ACL))
3610
      break;
3611
    /* Conditionally writes to binlog */
3612
    if (!(res= mysql_rename_user(thd, lex->users_list)))
3613
      my_ok(thd);
3614 3615 3616 3617
    break;
  }
  case SQLCOM_REVOKE_ALL:
  {
Marc Alff's avatar
Marc Alff committed
3618
    if (check_access(thd, UPDATE_ACL, "mysql", NULL, NULL, 1, 1) &&
3619
        check_global_access(thd,CREATE_USER_ACL))
3620
      break;
3621
    /* Conditionally writes to binlog */
3622
    if (!(res = mysql_revoke_all(thd, lex->users_list)))
3623
      my_ok(thd);
3624 3625
    break;
  }
3626 3627 3628 3629
  case SQLCOM_REVOKE:
  case SQLCOM_GRANT:
  {
    if (check_access(thd, lex->grant | lex->grant_tot_col | GRANT_ACL,
Marc Alff's avatar
Marc Alff committed
3630 3631 3632 3633
                     first_table ?  first_table->db : select_lex->db,
                     first_table ? &first_table->grant.privilege : NULL,
                     first_table ? &first_table->grant.m_internal : NULL,
                     first_table ? 0 : 1, 0))
3634 3635
      goto error;

3636
    if (thd->security_ctx->user)              // If not replication
3637
    {
3638
      LEX_USER *user, *tmp_user;
3639

3640
      List_iterator <LEX_USER> user_list(lex->users_list);
3641
      while ((tmp_user= user_list++))
3642
      {
3643 3644
        if (!(user= get_current_user(thd, tmp_user)))
          goto error;
3645 3646 3647 3648 3649 3650 3651 3652
        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);
3653
        if (strcmp(thd->security_ctx->user, user->user.str) ||
3654
            my_strcasecmp(system_charset_info,
3655
                          user->host.str, thd->security_ctx->host_or_ip))
3656 3657
        {
          // TODO: use check_change_password()
3658 3659
          if (is_acl_user(user->host.str, user->user.str) &&
              user->password.str &&
Marc Alff's avatar
Marc Alff committed
3660
              check_access(thd, UPDATE_ACL, "mysql", NULL, NULL, 1, 1))
3661 3662 3663 3664 3665 3666
          {
            my_message(ER_PASSWORD_NOT_ALLOWED,
                       ER(ER_PASSWORD_NOT_ALLOWED), MYF(0));
            goto error;
          }
        }
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
3667 3668
      }
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3669
    if (first_table)
3670
    {
3671 3672
      if (lex->type == TYPE_ENUM_PROCEDURE ||
          lex->type == TYPE_ENUM_FUNCTION)
3673 3674 3675 3676
      {
        uint grants= lex->all_privileges 
		   ? (PROC_ACLS & ~GRANT_ACL) | (lex->grant & GRANT_ACL)
		   : lex->grant;
3677
        if (check_grant_routine(thd, grants | GRANT_ACL, all_tables,
3678
                                lex->type == TYPE_ENUM_PROCEDURE, 0))
3679
	  goto error;
3680
        /* Conditionally writes to binlog */
3681 3682 3683
        res= mysql_routine_grant(thd, all_tables,
                                 lex->type == TYPE_ENUM_PROCEDURE, 
                                 lex->users_list, grants,
3684 3685 3686
                                 lex->sql_command == SQLCOM_REVOKE, TRUE);
        if (!res)
          my_ok(thd);
3687 3688 3689
      }
      else
      {
3690
	if (check_grant(thd,(lex->grant | lex->grant_tot_col | GRANT_ACL),
3691
                        all_tables, FALSE, UINT_MAX, FALSE))
3692
	  goto error;
3693
        /* Conditionally writes to binlog */
3694 3695 3696 3697
        res= mysql_table_grant(thd, all_tables, lex->users_list,
			       lex->columns, lex->grant,
			       lex->sql_command == SQLCOM_REVOKE);
      }
3698 3699 3700
    }
    else
    {
3701
      if (lex->columns.elements || lex->type)
3702
      {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3703 3704
	my_message(ER_ILLEGAL_GRANT_FOR_TABLE, ER(ER_ILLEGAL_GRANT_FOR_TABLE),
                   MYF(0));
3705
        goto error;
3706 3707
      }
      else
3708
	/* Conditionally writes to binlog */
3709 3710 3711 3712
	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
			  lex->sql_command == SQLCOM_REVOKE);
      if (!res)
      {
3713
	if (lex->sql_command == SQLCOM_GRANT)
3714
	{
3715
	  List_iterator <LEX_USER> str_list(lex->users_list);
3716 3717 3718 3719 3720
	  LEX_USER *user, *tmp_user;
	  while ((tmp_user=str_list++))
          {
            if (!(user= get_current_user(thd, tmp_user)))
              goto error;
3721
	    reset_mqh(user, 0);
3722
          }
3723
	}
3724 3725 3726 3727
      }
    }
    break;
  }
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
3728
#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/
monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
3729
  case SQLCOM_RESET:
3730 3731 3732
    /*
      RESET commands are never written to the binary log, so we have to
      initialize this variable because RESET shares the same code as FLUSH
3733 3734 3735 3736
    */
    lex->no_write_to_binlog= 1;
  case SQLCOM_FLUSH:
  {
3737
    bool write_to_binlog;
3738
    if (check_global_access(thd,RELOAD_ACL))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3739
      goto error;
3740

3741 3742 3743 3744
    /*
      reload_acl_and_cache() will tell us if we are allowed to write to the
      binlog or not.
    */
3745
    if (!reload_acl_and_cache(thd, lex->type, first_table, &write_to_binlog))
3746 3747 3748 3749 3750
    {
      /*
        We WANT to write and we CAN write.
        ! we write after unlocking the table.
      */
3751 3752 3753
      /*
        Presumably, RESET and binlog writing doesn't require synchronization
      */
3754 3755
      if (!lex->no_write_to_binlog && write_to_binlog)
      {
Davi Arnaut's avatar
Davi Arnaut committed
3756
        if ((res= write_bin_log(thd, FALSE, thd->query(), thd->query_length())))
3757
          break;
3758
      }
3759
      my_ok(thd);
3760 3761
    } 
    
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3762
    break;
3763
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3764
  case SQLCOM_KILL:
3765 3766 3767
  {
    Item *it= (Item *)lex->value_list.head();

3768 3769 3770 3771 3772 3773 3774
    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;
    }

3775
    if ((!it->fixed && it->fix_fields(lex->thd, &it)) || it->check_cols(1))
3776 3777 3778 3779 3780
    {
      my_message(ER_SET_CONSTANTS_ONLY, ER(ER_SET_CONSTANTS_ONLY),
		 MYF(0));
      goto error;
    }
3781
    sql_kill(thd, (ulong)it->val_int(), lex->type & ONLY_KILL_QUERY);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3782
    break;
3783
  }
hf@deer.(none)'s avatar
hf@deer.(none) committed
3784
#ifndef NO_EMBEDDED_ACCESS_CHECKS
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3785
  case SQLCOM_SHOW_GRANTS:
3786 3787 3788 3789
  {
    LEX_USER *grant_user= get_current_user(thd, lex->grant_user);
    if (!grant_user)
      goto error;
3790
    if ((thd->security_ctx->priv_user &&
3791
	 !strcmp(thd->security_ctx->priv_user, grant_user->user.str)) ||
Marc Alff's avatar
Marc Alff committed
3792
        !check_access(thd, SELECT_ACL, "mysql", NULL, NULL, 1, 0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3793
    {
3794
      res = mysql_show_grants(thd, grant_user);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3795 3796
    }
    break;
3797
  }
hf@deer.(none)'s avatar
hf@deer.(none) committed
3798
#endif
3799
  case SQLCOM_HA_OPEN:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3800
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3801
    if (check_table_access(thd, SELECT_ACL, all_tables, FALSE, UINT_MAX, FALSE))
3802
      goto error;
monty@mysql.com's avatar
monty@mysql.com committed
3803
    res= mysql_ha_open(thd, first_table, 0);
3804 3805
    break;
  case SQLCOM_HA_CLOSE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3806 3807
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    res= mysql_ha_close(thd, first_table);
3808 3809
    break;
  case SQLCOM_HA_READ:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3810
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3811 3812 3813 3814 3815
    /*
      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.
    */
3816
    unit->set_limit(select_lex);
3817
    res= mysql_ha_read(thd, first_table, lex->ha_read_mode, lex->ident.str,
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3818
                       lex->insert_list, lex->ha_rkey_mode, select_lex->where,
3819
                       unit->select_limit_cnt, unit->offset_limit_cnt);
3820 3821
    break;

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3822
  case SQLCOM_BEGIN:
Konstantin Osipov's avatar
Konstantin Osipov committed
3823
    if (trans_begin(thd, lex->start_transaction_opt))
3824
      goto error;
3825
    my_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3826 3827
    break;
  case SQLCOM_COMMIT:
3828 3829
    DBUG_ASSERT(thd->lock == NULL ||
                thd->locked_tables_mode == LTM_LOCK_TABLES);
Konstantin Osipov's avatar
Konstantin Osipov committed
3830 3831
    if (trans_commit(thd))
      goto error;
3832
    thd->mdl_context.release_transactional_locks();
Konstantin Osipov's avatar
Konstantin Osipov committed
3833 3834
    /* Begin transaction with the same isolation level. */
    if (lex->tx_chain && trans_begin(thd))
3835
      goto error;
Konstantin Osipov's avatar
Konstantin Osipov committed
3836 3837 3838
    /* Disconnect the current client connection. */
    if (lex->tx_release)
      thd->killed= THD::KILL_CONNECTION;
3839
    my_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3840 3841
    break;
  case SQLCOM_ROLLBACK:
3842 3843
    DBUG_ASSERT(thd->lock == NULL ||
                thd->locked_tables_mode == LTM_LOCK_TABLES);
Konstantin Osipov's avatar
Konstantin Osipov committed
3844
    if (trans_rollback(thd))
3845
      goto error;
3846
    thd->mdl_context.release_transactional_locks();
Konstantin Osipov's avatar
Konstantin Osipov committed
3847 3848 3849 3850 3851 3852
    /* Begin transaction with the same isolation level. */
    if (lex->tx_chain && trans_begin(thd))
      goto error;
    /* Disconnect the current client connection. */
    if (lex->tx_release)
      thd->killed= THD::KILL_CONNECTION;
3853
    my_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3854
    break;
serg@serg.mylan's avatar
serg@serg.mylan committed
3855
  case SQLCOM_RELEASE_SAVEPOINT:
Konstantin Osipov's avatar
Konstantin Osipov committed
3856 3857 3858
    if (trans_release_savepoint(thd, lex->ident))
      goto error;
    my_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3859
    break;
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3860
  case SQLCOM_ROLLBACK_TO_SAVEPOINT:
Konstantin Osipov's avatar
Konstantin Osipov committed
3861 3862 3863
    if (trans_rollback_to_savepoint(thd, lex->ident))
      goto error;
    my_ok(thd);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3864
    break;
3865
  case SQLCOM_SAVEPOINT:
Konstantin Osipov's avatar
Konstantin Osipov committed
3866 3867 3868
    if (trans_savepoint(thd, lex->ident))
      goto error;
    my_ok(thd);
3869
    break;
3870 3871
  case SQLCOM_CREATE_PROCEDURE:
  case SQLCOM_CREATE_SPFUNCTION:
monty@mysql.com's avatar
monty@mysql.com committed
3872
  {
3873
    uint namelen;
3874
    char *name;
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
3875
    int sp_result= SP_INTERNAL_ERROR;
3876

3877
    DBUG_ASSERT(lex->sphead != 0);
3878
    DBUG_ASSERT(lex->sphead->m_db.str); /* Must be initialized in the parser */
3879 3880 3881 3882
    /*
      Verify that the database name is allowed, optionally
      lowercase it.
    */
3883
    if (check_db_name(&lex->sphead->m_db))
3884
    {
3885
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->sphead->m_db.str);
3886
      goto create_sp_error;
3887 3888
    }

3889
    /*
3890 3891 3892
      Check that a database directory with this name
      exists. Design note: This won't work on virtual databases
      like information_schema.
3893 3894
    */
    if (check_db_dir_existence(lex->sphead->m_db.str))
3895
    {
3896
      my_error(ER_BAD_DB_ERROR, MYF(0), lex->sphead->m_db.str);
3897
      goto create_sp_error;
3898
    }
3899

Marc Alff's avatar
Marc Alff committed
3900 3901
    if (check_access(thd, CREATE_PROC_ACL, lex->sphead->m_db.str,
                     NULL, NULL, 0, 0))
3902
      goto create_sp_error;
3903 3904

    name= lex->sphead->name(&namelen);
3905
#ifdef HAVE_DLOPEN
monty@mysql.com's avatar
monty@mysql.com committed
3906 3907 3908
    if (lex->sphead->m_type == TYPE_ENUM_FUNCTION)
    {
      udf_func *udf = find_udf(name, namelen);
3909

monty@mysql.com's avatar
monty@mysql.com committed
3910
      if (udf)
3911
      {
3912 3913
        my_error(ER_UDF_EXISTS, MYF(0), name);
        goto create_sp_error;
3914
      }
monty@mysql.com's avatar
monty@mysql.com committed
3915 3916 3917
    }
#endif

3918 3919
    if (sp_process_definer(thd))
      goto create_sp_error;
3920

Konstantin Osipov's avatar
Konstantin Osipov committed
3921
    res= (sp_result= sp_create_routine(thd, lex->sphead->m_type, lex->sphead));
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
3922
    switch (sp_result) {
3923
    case SP_OK: {
3924
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3925
      /* only add privileges if really neccessary */
3926 3927 3928 3929 3930

      Security_context security_context;
      bool restore_backup_context= false;
      Security_context *backup= NULL;
      LEX_USER *definer= thd->lex->definer;
Konstantin Osipov's avatar
Konstantin Osipov committed
3931 3932 3933 3934 3935 3936 3937 3938 3939 3940
      /*
        We're going to issue an implicit GRANT statement.
        It takes metadata locks and updates system tables.
        Make sure that sp_create_routine() did not leave any
        locks in the MDL context, so there is no risk to
        deadlock.
      */
      trans_commit_implicit(thd);
      close_thread_tables(thd);
      thd->mdl_context.release_transactional_locks();
3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958
      /*
        Check if the definer exists on slave, 
        then use definer privilege to insert routine privileges to mysql.procs_priv.

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

3959
      if (sp_automatic_privileges && !opt_noacl &&
3960
          check_routine_access(thd, DEFAULT_CREATE_PROC_ACLS,
3961
                               lex->sphead->m_db.str, name,
3962
                               lex->sql_command == SQLCOM_CREATE_PROCEDURE, 1))
3963
      {
3964
        if (sp_grant_privileges(thd, lex->sphead->m_db.str, name,
3965
                                lex->sql_command == SQLCOM_CREATE_PROCEDURE))
3966 3967 3968
          push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                       ER_PROC_AUTO_GRANT_FAIL,
                       ER(ER_PROC_AUTO_GRANT_FAIL));
3969
      }
3970 3971 3972 3973 3974 3975 3976 3977 3978 3979

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

3980
#endif
monty@mysql.com's avatar
monty@mysql.com committed
3981
    break;
3982
    }
3983 3984 3985 3986 3987 3988 3989 3990 3991
    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;
3992 3993 3994
    case SP_FLD_STORE_FAILED:
      my_error(ER_CANT_CREATE_SROUTINE, MYF(0), name);
      break;
3995 3996 3997 3998 3999 4000 4001 4002 4003 4004
    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:
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
4005
    if (sp_result != SP_OK )
4006
      goto error;
4007
    my_ok(thd);
4008 4009
    break; /* break super switch */
  } /* end case group bracket */
4010 4011 4012
  case SQLCOM_CALL:
    {
      sp_head *sp;
4013 4014 4015 4016
      /*
        This will cache all SP and SF and open and lock all tables
        required for execution.
      */
4017 4018
      if (check_table_access(thd, SELECT_ACL, all_tables, FALSE,
                             UINT_MAX, FALSE) ||
4019 4020 4021 4022
	  open_and_lock_tables(thd, all_tables))
       goto error;

      /*
4023 4024
        By this moment all needed SPs should be in cache so no need to look 
        into DB. 
4025
      */
4026 4027
      if (!(sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname,
                                &thd->sp_proc_cache, TRUE)))
4028
      {
4029
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "PROCEDURE",
4030
                 lex->spname->m_qname.str);
4031
	goto error;
4032 4033 4034
      }
      else
      {
pem@mysql.comhem.se's avatar
pem@mysql.comhem.se committed
4035
	ha_rows select_limit;
monty@mysql.com's avatar
monty@mysql.com committed
4036 4037
        /* bits that should be cleared in thd->server_status */
	uint bits_to_be_cleared= 0;
4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049
        /*
          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;
        }
4050

4051
	if (sp->m_flags & sp_head::MULTI_RESULTS)
4052
	{
4053
	  if (! (thd->client_capabilities & CLIENT_MULTI_RESULTS))
4054
	  {
4055 4056 4057 4058
            /*
              The client does not support multiple result sets being sent
              back
            */
4059
	    my_error(ER_SP_BADSELECT, MYF(0), sp->m_qname.str);
4060 4061
	    goto error;
	  }
monty@mysql.com's avatar
monty@mysql.com committed
4062 4063 4064 4065 4066 4067 4068
          /*
            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;
4069 4070
	}

4071
	if (check_routine_access(thd, EXECUTE_ACL,
4072
				 sp->m_db.str, sp->m_name.str, TRUE, FALSE))
4073 4074 4075
	{
	  goto error;
	}
pem@mysql.comhem.se's avatar
pem@mysql.comhem.se committed
4076 4077
	select_limit= thd->variables.select_limit;
	thd->variables.select_limit= HA_POS_ERROR;
4078

4079
        /* 
4080
          We never write CALL statements into binlog:
4081 4082 4083 4084 4085
           - 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.
4086
        */
4087
	res= sp->execute_procedure(thd, &lex->value_list);
4088

pem@mysql.comhem.se's avatar
pem@mysql.comhem.se committed
4089
	thd->variables.select_limit= select_limit;
4090

monty@mysql.com's avatar
monty@mysql.com committed
4091
        thd->server_status&= ~bits_to_be_cleared;
4092

4093
	if (!res)
4094 4095
          my_ok(thd, (ulong) (thd->row_count_func < 0 ? 0 :
                              thd->row_count_func));
4096
	else
4097
        {
4098
          DBUG_ASSERT(thd->is_error() || thd->killed);
4099
	  goto error;		// Substatement should already have sent error
4100
        }
4101
      }
4102
      break;
4103 4104
    }
  case SQLCOM_ALTER_PROCEDURE:
4105
  case SQLCOM_ALTER_FUNCTION:
4106
    {
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
4107
      int sp_result;
Konstantin Osipov's avatar
Konstantin Osipov committed
4108 4109
      int type= (lex->sql_command == SQLCOM_ALTER_PROCEDURE ?
                 TYPE_ENUM_PROCEDURE : TYPE_ENUM_FUNCTION);
anozdrin/alik@ibm's avatar
anozdrin/alik@ibm committed
4110

Konstantin Osipov's avatar
Konstantin Osipov committed
4111 4112 4113 4114
      if (check_routine_access(thd, ALTER_PROC_ACL, lex->spname->m_db.str,
                               lex->spname->m_name.str,
                               lex->sql_command == SQLCOM_ALTER_PROCEDURE, 0))
        goto error;
anozdrin/alik@ibm's avatar
anozdrin/alik@ibm committed
4115

Konstantin Osipov's avatar
Konstantin Osipov committed
4116 4117 4118 4119 4120 4121 4122 4123
      /*
        Note that if you implement the capability of ALTER FUNCTION to
        alter the body of the function, this command should be made to
        follow the restrictions that log-bin-trust-function-creators=0
        already puts on CREATE FUNCTION.
      */
      /* Conditionally writes to binlog */
      sp_result= sp_update_routine(thd, type, lex->spname, &lex->sp_chistics);
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
4124
      switch (sp_result)
4125
      {
4126
      case SP_OK:
4127
	my_ok(thd);
4128 4129
	break;
      case SP_KEY_NOT_FOUND:
4130 4131
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4132 4133
	goto error;
      default:
4134 4135
	my_error(ER_SP_CANT_ALTER, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4136
	goto error;
4137
      }
4138
      break;
4139 4140
    }
  case SQLCOM_DROP_PROCEDURE:
4141
  case SQLCOM_DROP_FUNCTION:
4142
    {
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
4143
      int sp_result;
4144 4145
      int type= (lex->sql_command == SQLCOM_DROP_PROCEDURE ?
                 TYPE_ENUM_PROCEDURE : TYPE_ENUM_FUNCTION);
4146

Konstantin Osipov's avatar
Konstantin Osipov committed
4147 4148 4149 4150 4151 4152
      /*
        @todo: here we break the metadata locking protocol by
        looking up the information about the routine without
        a metadata lock. Rewrite this piece to make sp_drop_routine
        return whether the routine existed or not.
      */
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
4153
      sp_result= sp_routine_exists_in_table(thd, type, lex->spname);
Marc Alff's avatar
Marc Alff committed
4154
      thd->warning_info->opt_clear_warning_info(thd->query_id);
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
4155
      if (sp_result == SP_OK)
4156
      {
4157 4158 4159
        char *db= lex->spname->m_db.str;
	char *name= lex->spname->m_name.str;

4160 4161
	if (check_routine_access(thd, ALTER_PROC_ACL, db, name,
                                 lex->sql_command == SQLCOM_DROP_PROCEDURE, 0))
bell@sanja.is.com.ua's avatar
merge  
bell@sanja.is.com.ua committed
4162
          goto error;
4163

Konstantin Osipov's avatar
Konstantin Osipov committed
4164 4165
        /* Conditionally writes to binlog */
        sp_result= sp_drop_routine(thd, type, lex->spname);
4166

Konstantin Osipov's avatar
Konstantin Osipov committed
4167 4168 4169 4170 4171 4172 4173 4174 4175
#ifndef NO_EMBEDDED_ACCESS_CHECKS
        /*
          We're going to issue an implicit REVOKE statement.
          It takes metadata locks and updates system tables.
          Make sure that sp_create_routine() did not leave any
          locks in the MDL context, so there is no risk to
          deadlock.
        */
        trans_commit_implicit(thd);
4176
        close_thread_tables(thd);
4177
        thd->mdl_context.release_transactional_locks();
4178

4179
	if (sp_automatic_privileges && !opt_noacl &&
Konstantin Osipov's avatar
Konstantin Osipov committed
4180
	    sp_revoke_privileges(thd, db, name,
4181
                                 lex->sql_command == SQLCOM_DROP_PROCEDURE))
4182
	{
Konstantin Osipov's avatar
Konstantin Osipov committed
4183
	  push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
4184 4185 4186
		       ER_PROC_AUTO_REVOKE_FAIL,
		       ER(ER_PROC_AUTO_REVOKE_FAIL));
	}
4187
#endif
4188 4189 4190
      }
      else
      {
4191
#ifdef HAVE_DLOPEN
4192 4193 4194 4195 4196 4197
	if (lex->sql_command == SQLCOM_DROP_FUNCTION)
	{
          udf_func *udf = find_udf(lex->spname->m_name.str,
                                   lex->spname->m_name.length);
          if (udf)
          {
Marc Alff's avatar
Marc Alff committed
4198
            if (check_access(thd, DELETE_ACL, "mysql", NULL, NULL, 1, 0))
4199
	      goto error;
4200

4201
	    if (!(res = mysql_drop_function(thd, &lex->spname->m_name)))
4202
	    {
4203
	      my_ok(thd);
4204
	      break;
4205 4206
	    }
	  }
4207
	}
4208
#endif
4209
	if (lex->spname->m_db.str)
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
4210
	  sp_result= SP_KEY_NOT_FOUND;
4211 4212 4213 4214 4215
	else
	{
	  my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
	  goto error;
	}
4216
      }
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
4217 4218
      res= sp_result;
      switch (sp_result) {
4219
      case SP_OK:
4220
	my_ok(thd);
4221 4222
	break;
      case SP_KEY_NOT_FOUND:
4223 4224
	if (lex->drop_if_exists)
	{
4225
          res= write_bin_log(thd, TRUE, thd->query(), thd->query_length());
4226
	  push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
4227
			      ER_SP_DOES_NOT_EXIST, ER(ER_SP_DOES_NOT_EXIST),
4228
			      SP_COM_STRING(lex), lex->spname->m_name.str);
4229 4230
          if (!res)
            my_ok(thd);
4231 4232
	  break;
	}
4233 4234
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4235 4236
	goto error;
      default:
4237 4238
	my_error(ER_SP_DROP_FAILED, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4239
	goto error;
4240
      }
4241
      break;
4242
    }
4243 4244
  case SQLCOM_SHOW_CREATE_PROC:
    {
anozdrin/alik@ibm's avatar
anozdrin/alik@ibm committed
4245
      if (sp_show_create_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname))
Konstantin Osipov's avatar
Konstantin Osipov committed
4246
        goto error;
4247 4248 4249 4250
      break;
    }
  case SQLCOM_SHOW_CREATE_FUNC:
    {
anozdrin/alik@ibm's avatar
anozdrin/alik@ibm committed
4251
      if (sp_show_create_routine(thd, TYPE_ENUM_FUNCTION, lex->spname))
4252 4253 4254
	goto error;
      break;
    }
pem@mysql.com's avatar
pem@mysql.com committed
4255 4256 4257
  case SQLCOM_SHOW_PROC_CODE:
  case SQLCOM_SHOW_FUNC_CODE:
    {
4258
#ifndef DBUG_OFF
pem@mysql.com's avatar
pem@mysql.com committed
4259
      sp_head *sp;
Konstantin Osipov's avatar
Konstantin Osipov committed
4260 4261
      int type= (lex->sql_command == SQLCOM_SHOW_PROC_CODE ?
                 TYPE_ENUM_PROCEDURE : TYPE_ENUM_FUNCTION);
pem@mysql.com's avatar
pem@mysql.com committed
4262

Konstantin Osipov's avatar
Konstantin Osipov committed
4263 4264
      if (sp_cache_routine(thd, type, lex->spname, FALSE, &sp))
        goto error;
4265
      if (!sp || sp->show_routine_code(thd))
4266 4267
      {
        /* We don't distinguish between errors for now */
pem@mysql.com's avatar
pem@mysql.com committed
4268 4269 4270 4271 4272
        my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
        goto error;
      }
      break;
4273 4274 4275 4276
#else
      my_error(ER_FEATURE_DISABLED, MYF(0),
               "SHOW PROCEDURE|FUNCTION CODE", "--with-debug");
      goto error;
pem@mysql.com's avatar
pem@mysql.com committed
4277
#endif // ifndef DBUG_OFF
4278
    }
4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291
  case SQLCOM_SHOW_CREATE_TRIGGER:
    {
      if (lex->spname->m_name.length > NAME_LEN)
      {
        my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str);
        goto error;
      }

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

      break;
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4292 4293
  case SQLCOM_CREATE_VIEW:
    {
4294 4295 4296 4297
      /*
        Note: SQLCOM_CREATE_VIEW also handles 'ALTER VIEW' commands
        as specified through the thd->lex->create_view_mode flag.
      */
4298
      res= mysql_create_view(thd, first_table, thd->lex->create_view_mode);
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4299 4300 4301 4302
      break;
    }
  case SQLCOM_DROP_VIEW:
    {
Konstantin Osipov's avatar
Konstantin Osipov committed
4303
      if (check_table_access(thd, DROP_ACL, all_tables, FALSE, UINT_MAX, FALSE))
4304
        goto error;
4305 4306
      /* Conditionally writes to binlog. */
      res= mysql_drop_view(thd, first_table, thd->lex->drop_mode);
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4307 4308
      break;
    }
4309 4310
  case SQLCOM_CREATE_TRIGGER:
  {
4311
    /* Conditionally writes to binlog. */
4312 4313
    res= mysql_create_or_drop_trigger(thd, all_tables, 1);

4314 4315 4316 4317
    break;
  }
  case SQLCOM_DROP_TRIGGER:
  {
4318
    /* Conditionally writes to binlog. */
4319 4320 4321
    res= mysql_create_or_drop_trigger(thd, all_tables, 0);
    break;
  }
4322
  case SQLCOM_XA_START:
Konstantin Osipov's avatar
Konstantin Osipov committed
4323 4324
    if (trans_xa_start(thd))
      goto error;
4325
    my_ok(thd);
4326 4327
    break;
  case SQLCOM_XA_END:
Konstantin Osipov's avatar
Konstantin Osipov committed
4328 4329
    if (trans_xa_end(thd))
      goto error;
4330
    my_ok(thd);
4331 4332
    break;
  case SQLCOM_XA_PREPARE:
Konstantin Osipov's avatar
Konstantin Osipov committed
4333 4334
    if (trans_xa_prepare(thd))
      goto error;
4335
    my_ok(thd);
4336 4337
    break;
  case SQLCOM_XA_COMMIT:
Konstantin Osipov's avatar
Konstantin Osipov committed
4338 4339
    if (trans_xa_commit(thd))
      goto error;
4340
    thd->mdl_context.release_transactional_locks();
Konstantin Osipov's avatar
Konstantin Osipov committed
4341
    my_ok(thd);
4342 4343
    break;
  case SQLCOM_XA_ROLLBACK:
Konstantin Osipov's avatar
Konstantin Osipov committed
4344 4345
    if (trans_xa_rollback(thd))
      goto error;
4346
    thd->mdl_context.release_transactional_locks();
Konstantin Osipov's avatar
Konstantin Osipov committed
4347
    my_ok(thd);
4348 4349
    break;
  case SQLCOM_XA_RECOVER:
4350
    res= mysql_xa_recover(thd);
4351
    break;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
4352
  case SQLCOM_ALTER_TABLESPACE:
4353
    if (check_global_access(thd, CREATE_TABLESPACE_ACL))
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
4354 4355
      break;
    if (!(res= mysql_alter_tablespace(thd, lex->alter_tablespace_info)))
4356
      my_ok(thd);
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
4357 4358 4359 4360
    break;
  case SQLCOM_INSTALL_PLUGIN:
    if (! (res= mysql_install_plugin(thd, &thd->lex->comment,
                                     &thd->lex->ident)))
4361
      my_ok(thd);
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
4362 4363 4364
    break;
  case SQLCOM_UNINSTALL_PLUGIN:
    if (! (res= mysql_uninstall_plugin(thd, &thd->lex->comment)))
4365
      my_ok(thd);
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
4366 4367 4368 4369 4370 4371 4372 4373 4374 4375
    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;
  }
patg@radha.tangent.org's avatar
patg@radha.tangent.org committed
4376 4377 4378 4379 4380
  case SQLCOM_CREATE_SERVER:
  {
    int error;
    LEX *lex= thd->lex;
    DBUG_PRINT("info", ("case SQLCOM_CREATE_SERVER"));
4381 4382 4383 4384

    if (check_global_access(thd, SUPER_ACL))
      break;

patg@radha.tangent.org's avatar
patg@radha.tangent.org committed
4385 4386
    if ((error= create_server(thd, &lex->server_options)))
    {
4387
      DBUG_PRINT("info", ("problem creating server <%s>",
patg@radha.tangent.org's avatar
patg@radha.tangent.org committed
4388 4389 4390 4391
                          lex->server_options.server_name));
      my_error(error, MYF(0), lex->server_options.server_name);
      break;
    }
4392
    my_ok(thd, 1);
patg@radha.tangent.org's avatar
patg@radha.tangent.org committed
4393 4394 4395 4396 4397 4398 4399
    break;
  }
  case SQLCOM_ALTER_SERVER:
  {
    int error;
    LEX *lex= thd->lex;
    DBUG_PRINT("info", ("case SQLCOM_ALTER_SERVER"));
4400 4401 4402 4403

    if (check_global_access(thd, SUPER_ACL))
      break;

patg@radha.tangent.org's avatar
patg@radha.tangent.org committed
4404 4405
    if ((error= alter_server(thd, &lex->server_options)))
    {
4406
      DBUG_PRINT("info", ("problem altering server <%s>",
patg@radha.tangent.org's avatar
patg@radha.tangent.org committed
4407 4408 4409 4410
                          lex->server_options.server_name));
      my_error(error, MYF(0), lex->server_options.server_name);
      break;
    }
4411
    my_ok(thd, 1);
patg@radha.tangent.org's avatar
patg@radha.tangent.org committed
4412 4413 4414 4415 4416 4417 4418
    break;
  }
  case SQLCOM_DROP_SERVER:
  {
    int err_code;
    LEX *lex= thd->lex;
    DBUG_PRINT("info", ("case SQLCOM_DROP_SERVER"));
4419 4420 4421 4422

    if (check_global_access(thd, SUPER_ACL))
      break;

patg@radha.tangent.org's avatar
patg@radha.tangent.org committed
4423 4424
    if ((err_code= drop_server(thd, &lex->server_options)))
    {
4425
      if (! lex->drop_if_exists && err_code == ER_FOREIGN_SERVER_DOESNT_EXIST)
patg@radha.tangent.org's avatar
patg@radha.tangent.org committed
4426 4427 4428 4429 4430 4431 4432
      {
        DBUG_PRINT("info", ("problem dropping server %s",
                            lex->server_options.server_name));
        my_error(err_code, MYF(0), lex->server_options.server_name);
      }
      else
      {
4433
        my_ok(thd, 0);
patg@radha.tangent.org's avatar
patg@radha.tangent.org committed
4434 4435 4436
      }
      break;
    }
4437
    my_ok(thd, 1);
patg@radha.tangent.org's avatar
patg@radha.tangent.org committed
4438 4439
    break;
  }
Marc Alff's avatar
Marc Alff committed
4440 4441 4442 4443 4444
  case SQLCOM_SIGNAL:
  case SQLCOM_RESIGNAL:
    DBUG_ASSERT(lex->m_stmt != NULL);
    res= lex->m_stmt->execute(thd);
    break;
4445
  default:
4446
#ifndef EMBEDDED_LIBRARY
4447
    DBUG_ASSERT(0);                             /* Impossible */
4448
#endif
4449
    my_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4450 4451
    break;
  }
4452
  thd_proc_info(thd, "query end");
4453 4454

  /*
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
4455
    Binlog-related cleanup:
4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466
    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);

4467
  /*
4468 4469
    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
4470 4471 4472 4473
    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))
4474
    thd->row_count_func= -1;
4475

4476
  goto finish;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4477 4478

error:
4479 4480
  res= TRUE;

4481
finish:
4482
  if (thd->global_read_lock.has_protection())
4483 4484 4485 4486 4487
  {
    /*
      Release the protection against the global read lock and wake
      everyone, who might want to set a global read lock.
    */
4488
    thd->global_read_lock.start_waiting_global_read_lock(thd);
4489
  }
Konstantin Osipov's avatar
Konstantin Osipov committed
4490

4491 4492 4493 4494 4495 4496 4497 4498
  if (stmt_causes_implicit_commit(thd, CF_IMPLICIT_COMMIT_END))
  {
    /* If commit fails, we should be able to reset the OK status. */
    thd->stmt_da->can_overwrite_status= TRUE;
    /* Commit or rollback the statement transaction. */
    thd->is_error() ? trans_rollback_stmt(thd) : trans_commit_stmt(thd);
    /* Commit the normal transaction if one is active. */
    trans_commit_implicit(thd);
4499
    thd->stmt_da->can_overwrite_status= FALSE;
4500 4501
    /* Close tables and release metadata locks. */
    close_thread_tables(thd);
4502
    thd->mdl_context.release_transactional_locks();
4503
  }
Konstantin Osipov's avatar
Konstantin Osipov committed
4504

4505
  DBUG_RETURN(res || thd->is_error());
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4506 4507 4508
}


4509 4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 4522 4523 4524 4525 4526 4527 4528 4529 4530 4531
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()))
4532
        return 1;                               /* purecov: inspected */
4533 4534 4535 4536 4537 4538 4539
      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);
4540
        thd->lex->unit.print(&str, QT_ORDINARY);
4541 4542 4543 4544
        str.append('\0');
        push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
                     ER_YES, str.ptr());
      }
4545 4546 4547 4548
      if (res)
        result->abort();
      else
        result->send_eof();
4549 4550 4551 4552 4553
      delete result;
    }
    else
    {
      if (!result && !(result= new select_send()))
4554
        return 1;                               /* purecov: inspected */
4555 4556 4557 4558 4559 4560 4561 4562 4563 4564
      query_cache_store_query(thd, all_tables);
      res= handle_select(thd, lex, result, 0);
      if (result != lex->result)
        delete result;
    }
  }
  return res;
}


4565
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4566
/**
4567
  Check grants for commands which work only with one table.
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4568

4569 4570 4571
  @param thd                    Thread handler
  @param privilege              requested privilege
  @param all_tables             global table list of query
4572
  @param no_errors              FALSE/TRUE - report/don't report error to
4573
                            the client (using my_error() call).
4574 4575 4576 4577 4578

  @retval
    0   OK
  @retval
    1   access denied, error is sent to client
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4579 4580
*/

4581
bool check_single_table_access(THD *thd, ulong privilege, 
4582
                               TABLE_LIST *all_tables, bool no_errors)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4583
{
4584 4585 4586 4587 4588 4589
  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;

4590 4591 4592 4593 4594 4595 4596 4597
  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,
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Marc Alff committed
4598 4599 4600
                   &all_tables->grant.privilege,
                   &all_tables->grant.m_internal,
                   0, no_errors))
4601
    goto deny;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4602

4603
  /* Show only 1 table for check_grant */
4604
  if (!(all_tables->belong_to_view &&
4605
        (thd->lex->sql_command == SQLCOM_SHOW_FIELDS)) &&
4606
      check_grant(thd, privilege, all_tables, FALSE, 1, no_errors))
4607 4608 4609
    goto deny;

  thd->security_ctx= backup_ctx;
4610 4611 4612 4613 4614 4615 4616
  return 0;

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

4617
/**
4618 4619 4620
  Check grants for commands which work only with one table and all other
  tables belonging to subselects or implicitly opened tables.

4621 4622 4623 4624 4625 4626 4627 4628
  @param thd			Thread handler
  @param privilege		requested privilege
  @param all_tables		global table list of query

  @retval
    0   OK
  @retval
    1   access denied, error is sent to client
4629 4630 4631 4632
*/

bool check_one_table_access(THD *thd, ulong privilege, TABLE_LIST *all_tables)
{
4633
  if (check_single_table_access (thd,privilege,all_tables, FALSE))
4634
    return 1;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4635

4636
  /* Check rights on tables of subselects and implictly opened tables */
4637
  TABLE_LIST *subselects_tables, *view= all_tables->view ? all_tables : 0;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4638
  if ((subselects_tables= all_tables->next_global))
monty@mysql.com's avatar
monty@mysql.com committed
4639
  {
4640 4641 4642 4643 4644 4645
    /*
      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)
    {
4646
      if (check_single_table_access (thd, privilege, subselects_tables, FALSE))
4647 4648 4649 4650
        return 1;
      subselects_tables= subselects_tables->next_global;
    }
    if (subselects_tables &&
4651 4652
        (check_table_access(thd, SELECT_ACL, subselects_tables, FALSE,
                            UINT_MAX, FALSE)))
4653
      return 1;
monty@mysql.com's avatar
monty@mysql.com committed
4654 4655
  }
  return 0;
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bell@sanja.is.com.ua committed
4656 4657 4658
}


4659
/**
4660 4661 4662 4663 4664 4665
  @brief Compare requested privileges with the privileges acquired from the
    User- and Db-tables.
  @param thd          Thread handler
  @param want_access  The requested access privileges.
  @param db           A pointer to the Db name.
  @param[out] save_priv A pointer to the granted privileges will be stored.
Marc Alff's avatar
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4666
  @param grant_internal_info A pointer to the internal grant cache.
4667 4668 4669 4670 4671 4672 4673 4674
  @param dont_check_global_grants True if no global grants are checked.
  @param no_error     True if no errors should be sent to the client.

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

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4675 4676
  For internal databases (INFORMATION_SCHEMA, PERFORMANCE_SCHEMA),
  additional rules apply, see ACL_internal_schema_access.
4677 4678 4679 4680 4681 4682 4683

  @see check_grant

  @return Status of denial of access by exclusive ACLs.
    @retval FALSE Access can't exclusively be denied by Db- and User-table
      access unless Column- and Table-grants are checked too.
    @retval TRUE Access denied.
4684
*/
4685

bk@work.mysql.com's avatar
bk@work.mysql.com committed
4686
bool
4687
check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
Marc Alff's avatar
Marc Alff committed
4688 4689
             GRANT_INTERNAL_INFO *grant_internal_info,
             bool dont_check_global_grants, bool no_errors)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4690
{
4691
  Security_context *sctx= thd->security_ctx;
4692
  ulong db_access;
4693

4694 4695 4696 4697 4698
  /*
    GRANT command:
    In case of database level grant the database name may be a pattern,
    in case of table|column level grant the database name can not be a pattern.
    We use 'dont_check_global_grants' as a flag to determine
4699
    if it's database level grant command
4700 4701 4702
    (see SQLCOM_GRANT case, mysql_execute_command() function) and
    set db_is_pattern according to 'dont_check_global_grants' value.
  */
4703
  bool  db_is_pattern= ((want_access & GRANT_ACL) && dont_check_global_grants);
4704
  ulong dummy;
4705 4706
  DBUG_ENTER("check_access");
  DBUG_PRINT("enter",("db: %s  want_access: %lu  master_access: %lu",
4707
                      db ? db : "", want_access, sctx->master_access));
4708

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4709 4710 4711
  if (save_priv)
    *save_priv=0;
  else
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Marc Alff committed
4712
  {
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bk@work.mysql.com committed
4713
    save_priv= &dummy;
Marc Alff's avatar
Marc Alff committed
4714 4715
    dummy= 0;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4716

4717
  thd_proc_info(thd, "checking permissions");
4718
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4719
  {
4720
    DBUG_PRINT("error",("No database"));
4721
    if (!no_errors)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4722 4723
      my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR),
                 MYF(0));                       /* purecov: tested */
4724
    DBUG_RETURN(TRUE);				/* purecov: tested */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4725 4726
  }

Marc Alff's avatar
Marc Alff committed
4727
  if ((db != NULL) && (db != any_db))
4728
  {
Marc Alff's avatar
Marc Alff committed
4729 4730 4731
    const ACL_internal_schema_access *access;
    access= get_cached_schema_access(grant_internal_info, db);
    if (access)
4732
    {
Marc Alff's avatar
Marc Alff committed
4733
      switch (access->check(want_access, save_priv))
4734
      {
Marc Alff's avatar
Marc Alff committed
4735 4736 4737 4738 4739 4740 4741 4742 4743 4744 4745 4746 4747 4748 4749 4750 4751 4752 4753 4754
      case ACL_INTERNAL_ACCESS_GRANTED:
        /*
          All the privileges requested have been granted internally.
          [out] *save_privileges= Internal privileges.
        */
        DBUG_RETURN(FALSE);
      case ACL_INTERNAL_ACCESS_DENIED:
        if (! no_errors)
        {
          my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
                   sctx->priv_user, sctx->priv_host, db);
        }
        DBUG_RETURN(TRUE);
      case ACL_INTERNAL_ACCESS_CHECK_GRANT:
        /*
          Only some of the privilege requested have been granted internally,
          proceed with the remaining bits of the request (want_access).
        */
        want_access&= ~(*save_priv);
        break;
4755
      }
4756 4757 4758
    }
  }

4759
  if ((sctx->master_access & want_access) == want_access)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4760
  {
4761
    /*
4762 4763
      1. If we don't have a global SELECT privilege, we have to get the
      database specific access rights to be able to handle queries of type
4764
      UPDATE t1 SET a=1 WHERE b > 0
4765
      2. Change db access if it isn't current db which is being addressed
4766
    */
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Marc Alff committed
4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 4784 4785
    if (!(sctx->master_access & SELECT_ACL))
    {
      if (db && (!thd->db || db_is_pattern || strcmp(db, thd->db)))
        db_access= acl_get(sctx->host, sctx->ip, sctx->priv_user, db,
                           db_is_pattern);
      else
      {
        /* get access for current db */
        db_access= sctx->db_access;
      }
      /*
        The effective privileges are the union of the global privileges
        and the intersection of db- and host-privileges,
        plus the internal privileges.
      */
      *save_priv|= sctx->master_access | db_access;
    }
    else
      *save_priv|= sctx->master_access;
4786
    DBUG_RETURN(FALSE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4787
  }
4788
  if (((want_access & ~sctx->master_access) & ~DB_ACLS) ||
4789
      (! db && dont_check_global_grants))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4790
  {						// We can never grant this
4791
    DBUG_PRINT("error",("No possible access"));
4792
    if (!no_errors)
4793
      my_error(ER_ACCESS_DENIED_ERROR, MYF(0),
4794 4795
               sctx->priv_user,
               sctx->priv_host,
4796 4797 4798
               (thd->password ?
                ER(ER_YES) :
                ER(ER_NO)));                    /* purecov: tested */
4799
    DBUG_RETURN(TRUE);				/* purecov: tested */
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bk@work.mysql.com committed
4800 4801 4802
  }

  if (db == any_db)
4803 4804 4805 4806 4807 4808 4809
  {
    /*
      Access granted; Allow select on *any* db.
      [out] *save_privileges= 0
    */
    DBUG_RETURN(FALSE);
  }
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
4810

4811
  if (db && (!thd->db || db_is_pattern || strcmp(db,thd->db)))
4812 4813
    db_access= acl_get(sctx->host, sctx->ip, sctx->priv_user, db,
                       db_is_pattern);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4814
  else
4815
    db_access= sctx->db_access;
4816 4817
  DBUG_PRINT("info",("db_access: %lu  want_access: %lu",
                     db_access, want_access));
4818

4819 4820
  /*
    Save the union of User-table and the intersection between Db-table and
Marc Alff's avatar
Marc Alff committed
4821
    Host-table privileges, with the already saved internal privileges.
4822 4823
  */
  db_access= (db_access | sctx->master_access);
Marc Alff's avatar
Marc Alff committed
4824
  *save_priv|= db_access;
4825 4826 4827 4828 4829 4830 4831 4832 4833 4834 4835 4836 4837 4838 4839

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

  /*
    Grant access if the requested access is in the intersection of
    host- and db-privileges (as retrieved from the acl cache),
    also grant access if all the requested privileges are in the union of
    TABLES_ACLS and PROC_ACLS; see check_grant.
  */
  if ( (db_access & want_access) == want_access ||
4840
      (!dont_check_global_grants &&
4841 4842 4843 4844
       need_table_or_column_check))
  {
    /*
       Ok; but need to check table- and column privileges.
Marc Alff's avatar
Marc Alff committed
4845
       [out] *save_privileges is (User-priv | (Db-priv & Host-priv) | Internal-priv)
4846 4847 4848
    */
    DBUG_RETURN(FALSE);
  }
4849

4850 4851
  /*
    Access is denied;
Marc Alff's avatar
Marc Alff committed
4852
    [out] *save_privileges is (User-priv | (Db-priv & Host-priv) | Internal-priv)
4853
  */
4854
  DBUG_PRINT("error",("Access denied"));
4855
  if (!no_errors)
4856
    my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
4857
             sctx->priv_user, sctx->priv_host,
4858 4859
             (db ? db : (thd->db ?
                         thd->db :
4860 4861 4862
                         "unknown")));
  DBUG_RETURN(TRUE);

bk@work.mysql.com's avatar
bk@work.mysql.com committed
4863 4864 4865
}


4866 4867
static bool check_show_access(THD *thd, TABLE_LIST *table)
{
Marc Alff's avatar
Marc Alff committed
4868 4869 4870 4871 4872 4873 4874 4875 4876 4877 4878 4879
  /*
    This is a SHOW command using an INFORMATION_SCHEMA table.
    check_access() has not been called for 'table',
    and SELECT is currently always granted on the I_S, so we automatically
    grant SELECT on table here, to bypass a call to check_access().
    Note that not calling check_access(table) is an optimization,
    which needs to be revisited if the INFORMATION_SCHEMA does
    not always automatically grant SELECT but use the grant tables.
    See Bug#38837 need a way to disable information_schema for security
  */
  table->grant.privilege= SELECT_ACL;

4880
  switch (get_schema_table_idx(table->schema_table)) {
4881 4882
  case SCH_SCHEMATA:
    return (specialflag & SPECIAL_SKIP_SHOW_DB) &&
4883
      check_global_access(thd, SHOW_DB_ACL);
4884 4885 4886 4887 4888

  case SCH_TABLE_NAMES:
  case SCH_TABLES:
  case SCH_VIEWS:
  case SCH_TRIGGERS:
4889 4890 4891
  case SCH_EVENTS:
  {
    const char *dst_db_name= table->schema_select_lex->db;
4892

4893
    DBUG_ASSERT(dst_db_name);
4894

4895
    if (check_access(thd, SELECT_ACL, dst_db_name,
Marc Alff's avatar
Marc Alff committed
4896
                     &thd->col_access, NULL, FALSE, FALSE))
4897
      return TRUE;
4898

4899 4900 4901 4902 4903 4904 4905
    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;
4906 4907
    }

4908 4909 4910
    return FALSE;
  }

4911 4912
  case SCH_COLUMNS:
  case SCH_STATISTICS:
4913 4914 4915
  {
    TABLE_LIST *dst_table;
    dst_table= (TABLE_LIST *) table->schema_select_lex->table_list.first;
4916

4917
    DBUG_ASSERT(dst_table);
4918

4919
    if (check_access(thd, SELECT_ACL, dst_table->db,
Marc Alff's avatar
Marc Alff committed
4920 4921 4922
                     &dst_table->grant.privilege,
                     &dst_table->grant.m_internal,
                     FALSE, FALSE))
4923 4924 4925 4926 4927 4928 4929 4930
          return TRUE; /* Access denied */

    /*
      Check_grant will grant access if there is any column privileges on
      all of the tables thanks to the fourth parameter (bool show_table).
    */
    if (check_grant(thd, SELECT_ACL, dst_table, TRUE, UINT_MAX, FALSE))
      return TRUE; /* Access denied */
4931

4932 4933
    /* Access granted */
    return FALSE;
4934 4935
  }
  default:
4936 4937 4938 4939 4940 4941 4942
    break;
  }

  return FALSE;
}


4943

4944 4945 4946 4947 4948 4949 4950 4951 4952 4953 4954 4955 4956 4957 4958 4959 4960 4961 4962 4963 4964 4965 4966 4967 4968 4969 4970 4971
/**
  @brief Check if the requested privileges exists in either User-, Host- or
    Db-tables.
  @param thd          Thread context
  @param want_access  Privileges requested
  @param tables       List of tables to be compared against
  @param no_errors    Don't report error to the client (using my_error() call).
  @param any_combination_of_privileges_will_do TRUE if any privileges on any
    column combination is enough.
  @param number       Only the first 'number' tables in the linked list are
                      relevant.

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

  @see check_access
  @see check_grant

  @note This functions assumes that table list used and
  thd->lex->query_tables_own_last value correspond to each other
  (the latter should be either 0 or point to next_global member
  of one of elements of this table list).
4972

4973 4974 4975 4976
  @return
    @retval FALSE OK
    @retval TRUE  Access denied; But column or routine privileges might need to
      be checked also.
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bk@work.mysql.com committed
4977 4978
*/

4979
bool
4980 4981 4982
check_table_access(THD *thd, ulong requirements,TABLE_LIST *tables,
		   bool any_combination_of_privileges_will_do,
                   uint number, bool no_errors)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4983
{
4984 4985
  TABLE_LIST *org_tables= tables;
  TABLE_LIST *first_not_own_table= thd->lex->first_not_own_table();
4986
  uint i= 0;
4987
  Security_context *sctx= thd->security_ctx, *backup_ctx= thd->security_ctx;
4988
  /*
4989 4990 4991
    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.
4992
  */
4993
  for (; i < number && tables != first_not_own_table && tables;
4994
       tables= tables->next_global, i++)
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bk@work.mysql.com committed
4995
  {
4996
    ulong want_access= requirements;
4997 4998 4999 5000 5001
    if (tables->security_ctx)
      sctx= tables->security_ctx;
    else
      sctx= backup_ctx;

5002 5003 5004 5005 5006
    /*
       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);
5007 5008 5009 5010 5011 5012 5013 5014

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

5015 5016
    DBUG_PRINT("info", ("derived: %d  view: %d", tables->derived != 0,
                        tables->view != 0));
5017
    if (tables->is_anonymous_derived_table() ||
5018 5019
        (tables->table && tables->table->s &&
         (int)tables->table->s->tmp_table))
Sinisa@sinisa.nasamreza.org's avatar
Sinisa@sinisa.nasamreza.org committed
5020
      continue;
5021
    thd->security_ctx= sctx;
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Marc Alff committed
5022 5023 5024 5025 5026

    if (check_access(thd, want_access, tables->get_db_name(),
                     &tables->grant.privilege,
                     &tables->grant.m_internal,
                     0, no_errors))
5027
      goto deny;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5028
  }
5029
  thd->security_ctx= backup_ctx;
5030 5031 5032
  return check_grant(thd,requirements,org_tables,
                     any_combination_of_privileges_will_do,
                     number, no_errors);
5033 5034 5035
deny:
  thd->security_ctx= backup_ctx;
  return TRUE;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5036 5037
}

5038

5039
bool
5040 5041
check_routine_access(THD *thd, ulong want_access,char *db, char *name,
		     bool is_proc, bool no_errors)
5042 5043 5044 5045 5046
{
  TABLE_LIST tables[1];
  
  bzero((char *)tables, sizeof(TABLE_LIST));
  tables->db= db;
5047
  tables->table_name= tables->alias= name;
5048
  
monty@mysql.com's avatar
monty@mysql.com committed
5049 5050 5051 5052 5053
  /*
    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).
Marc Alff's avatar
Marc Alff committed
5054 5055 5056 5057 5058 5059
    Note that this effectively bypasses the ACL_internal_schema_access checks
    that are implemented for the INFORMATION_SCHEMA and PERFORMANCE_SCHEMA,
    which are located in check_access().
    Since the I_S and P_S do not contain routines, this bypass is ok,
    as long as this code path is not abused to create routines.
    The assert enforce that.
monty@mysql.com's avatar
monty@mysql.com committed
5060
  */
Marc Alff's avatar
Marc Alff committed
5061
  DBUG_ASSERT((want_access & CREATE_PROC_ACL) == 0);
monty@mysql.com's avatar
monty@mysql.com committed
5062
  if ((thd->security_ctx->master_access & want_access) == want_access)
5063
    tables->grant.privilege= want_access;
Marc Alff's avatar
Marc Alff committed
5064 5065 5066 5067
  else if (check_access(thd, want_access, db,
                        &tables->grant.privilege,
                        &tables->grant.m_internal,
                        0, no_errors))
5068 5069
    return TRUE;
  
5070
  return check_grant_routine(thd, want_access, tables, is_proc, no_errors);
5071 5072
}

5073

5074 5075
/**
  Check if the routine has any of the routine privileges.
5076

5077 5078 5079
  @param thd	       Thread handler
  @param db           Database name
  @param name         Routine name
5080

5081
  @retval
5082
    0            ok
5083
  @retval
5084 5085 5086
    1            error
*/

5087 5088
bool check_some_routine_access(THD *thd, const char *db, const char *name,
                               bool is_proc)
5089 5090
{
  ulong save_priv;
5091
  /*
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Marc Alff committed
5092 5093 5094 5095 5096 5097 5098
    The following test is just a shortcut for check_access() (to avoid
    calculating db_access)
    Note that this effectively bypasses the ACL_internal_schema_access checks
    that are implemented for the INFORMATION_SCHEMA and PERFORMANCE_SCHEMA,
    which are located in check_access().
    Since the I_S and P_S do not contain routines, this bypass is ok,
    as it only opens SHOW_PROC_ACLS.
5099
  */
Marc Alff's avatar
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5100 5101 5102
  if (thd->security_ctx->master_access & SHOW_PROC_ACLS)
    return FALSE;
  if (!check_access(thd, SHOW_PROC_ACLS, db, &save_priv, NULL, 0, 1) ||
5103 5104
      (save_priv & SHOW_PROC_ACLS))
    return FALSE;
5105
  return check_routine_level_acl(thd, db, name, is_proc);
5106 5107 5108
}


5109 5110 5111
/*
  Check if the given table has any of the asked privileges

5112 5113
  @param thd		 Thread handler
  @param want_access	 Bitmap of possible privileges to check for
5114

5115
  @retval
5116
    0  ok
5117
  @retval
5118 5119 5120 5121 5122 5123 5124 5125 5126 5127 5128 5129 5130 5131
    1  error
*/

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

  /* This loop will work as long as we have less than 32 privileges */
  for (access= 1; access < want_access ; access<<= 1)
  {
    if (access & want_access)
    {
      if (!check_access(thd, access, table->db,
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5132 5133 5134
                        &table->grant.privilege,
                        &table->grant.m_internal,
                        0, 1) &&
5135
           !check_grant(thd, access, table, FALSE, 1, TRUE))
5136 5137 5138 5139 5140 5141 5142
        DBUG_RETURN(0);
    }
  }
  DBUG_PRINT("exit",("no matching access rights"));
  DBUG_RETURN(1);
}

5143
#endif /*NO_EMBEDDED_ACCESS_CHECKS*/
5144

5145 5146 5147 5148 5149 5150 5151 5152 5153 5154 5155 5156 5157 5158 5159 5160 5161 5162 5163 5164 5165 5166 5167 5168 5169 5170 5171 5172 5173 5174 5175 5176 5177

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

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

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

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

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

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5178 5179 5180 5181
/****************************************************************************
	Check stack size; Send error if there isn't enough stack to continue
****************************************************************************/

5182 5183
#ifndef EMBEDDED_LIBRARY

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5184 5185 5186 5187 5188 5189
#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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5190 5191 5192 5193
#ifndef DBUG_OFF
long max_stack_used;
#endif

5194 5195
/**
  @note
5196 5197 5198 5199
  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.
5200
*/
5201
bool check_stack_overrun(THD *thd, long margin,
5202
			 uchar *buf __attribute__((unused)))
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5203 5204
{
  long stack_used;
5205
  DBUG_ASSERT(thd == current_thd);
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bk@work.mysql.com committed
5206
  if ((stack_used=used_stack(thd->thread_stack,(char*) &stack_used)) >=
5207
      (long) (my_thread_stack_size - margin))
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5208
  {
5209 5210 5211 5212
    char ebuff[MYSQL_ERRMSG_SIZE];
    my_snprintf(ebuff, sizeof(ebuff), ER(ER_STACK_OVERRUN_NEED_MORE),
                stack_used, my_thread_stack_size, margin);
    my_message(ER_STACK_OVERRUN_NEED_MORE, ebuff, MYF(ME_FATALERROR));
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bk@work.mysql.com committed
5213 5214
    return 1;
  }
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5215 5216 5217
#ifndef DBUG_OFF
  max_stack_used= max(max_stack_used, stack_used);
#endif
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5218 5219
  return 0;
}
5220
#endif /* EMBEDDED_LIBRARY */
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5221 5222 5223 5224

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

5225
bool my_yyoverflow(short **yyss, YYSTYPE **yyvs, ulong *yystacksize)
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bk@work.mysql.com committed
5226
{
5227
  Yacc_state *state= & current_thd->m_parser_state->m_yacc;
5228
  ulong old_info=0;
5229
  DBUG_ASSERT(state);
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bk@work.mysql.com committed
5230 5231
  if ((uint) *yystacksize >= MY_YACC_MAX)
    return 1;
5232
  if (!state->yacc_yyvs)
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bk@work.mysql.com committed
5233 5234
    old_info= *yystacksize;
  *yystacksize= set_zone((*yystacksize)*2,MY_YACC_INIT,MY_YACC_MAX);
5235
  if (!(state->yacc_yyvs= (uchar*)
5236
        my_realloc(state->yacc_yyvs,
5237 5238 5239
                   *yystacksize*sizeof(**yyvs),
                   MYF(MY_ALLOW_ZERO_PTR | MY_FREE_ON_ERROR))) ||
      !(state->yacc_yyss= (uchar*)
5240
        my_realloc(state->yacc_yyss,
5241 5242
                   *yystacksize*sizeof(**yyss),
                   MYF(MY_ALLOW_ZERO_PTR | MY_FREE_ON_ERROR))))
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bk@work.mysql.com committed
5243 5244
    return 1;
  if (old_info)
5245 5246 5247 5248 5249 5250 5251 5252
  {
    /*
      Only copy the old stack on the first call to my_yyoverflow(),
      when replacing a static stack (YYINITDEPTH) by a dynamic stack.
      For subsequent calls, my_realloc already did preserve the old stack.
    */
    memcpy(state->yacc_yyss, *yyss, old_info*sizeof(**yyss));
    memcpy(state->yacc_yyvs, *yyvs, old_info*sizeof(**yyvs));
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5253
  }
5254 5255
  *yyss= (short*) state->yacc_yyss;
  *yyvs= (YYSTYPE*) state->yacc_yyvs;
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5256 5257 5258 5259
  return 0;
}


5260
/**
5261 5262
  Reset the part of THD responsible for the state of command
  processing.
5263

5264 5265 5266
  This needs to be called before execution of every statement
  (prepared or conventional).  It is not called by substatements of
  routines.
5267

5268 5269
  @todo Remove mysql_reset_thd_for_next_command and only use the
  member function.
5270

5271 5272
  @todo Call it after we use THD for queries, not before.
*/
5273 5274
void mysql_reset_thd_for_next_command(THD *thd)
{
5275 5276 5277 5278 5279 5280
  thd->reset_for_next_command();
}

void THD::reset_for_next_command()
{
  THD *thd= this;
5281
  DBUG_ENTER("mysql_reset_thd_for_next_command");
5282
  DBUG_ASSERT(!thd->spcont); /* not for substatements of routines */
5283
  DBUG_ASSERT(! thd->in_sub_stmt);
5284
  thd->free_list= 0;
5285
  thd->select_number= 1;
5286 5287 5288 5289
  /*
    Those two lines below are theoretically unneeded as
    THD::cleanup_after_query() should take care of this already.
  */
5290
  thd->auto_inc_intervals_in_cur_stmt_for_binlog.empty();
5291 5292 5293
  thd->stmt_depends_on_first_successful_insert_id_in_prev_stmt= 0;

  thd->query_start_used= 0;
5294
  thd->is_fatal_error= thd->time_zone_used= 0;
5295 5296 5297 5298 5299
  /*
    Clear the status flag that are expected to be cleared at the
    beginning of each SQL statement.
  */
  thd->server_status&= ~SERVER_STATUS_CLEAR_SET;
5300 5301 5302 5303 5304
  /*
    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.
  */
5305
  if (!thd->in_multi_stmt_transaction())
5306
  {
5307
    thd->variables.option_bits&= ~OPTION_KEEP_LOG;
5308
    thd->transaction.all.modified_non_trans_table= FALSE;
5309
  }
5310
  DBUG_ASSERT(thd->security_ctx== &thd->main_security_ctx);
5311
  thd->thread_specific_used= FALSE;
5312 5313

  if (opt_bin_log)
5314
  {
5315 5316
    reset_dynamic(&thd->user_var_events);
    thd->user_var_events_alloc= thd->mem_root;
5317
  }
5318
  thd->clear_error();
Marc Alff's avatar
Marc Alff committed
5319 5320
  thd->stmt_da->reset_diagnostics_area();
  thd->warning_info->reset_for_next_command();
5321 5322 5323
  thd->rand_used= 0;
  thd->sent_row_count= thd->examined_row_count= 0;

5324
  thd->reset_current_stmt_binlog_format_row();
5325
  thd->binlog_unsafe_warning_flags= 0;
5326

5327
  DBUG_PRINT("debug",
5328
             ("is_current_stmt_binlog_format_row(): %d",
5329
              thd->is_current_stmt_binlog_format_row()));
5330

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bk@work.mysql.com committed
5331 5332 5333
  DBUG_VOID_RETURN;
}

5334

5335 5336 5337 5338 5339 5340 5341 5342
/**
  Resets the lex->current_select object.
  @note It is assumed that lex->current_select != NULL

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

5343 5344 5345
void
mysql_init_select(LEX *lex)
{
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5346
  SELECT_LEX *select_lex= lex->current_select;
5347
  select_lex->init_select();
5348
  lex->wild= 0;
5349 5350
  if (select_lex == &lex->select_lex)
  {
5351
    DBUG_ASSERT(lex->result == 0);
5352 5353
    lex->exchange= 0;
  }
5354 5355
}

5356

5357 5358 5359 5360 5361 5362 5363 5364 5365 5366 5367 5368
/**
  Used to allocate a new SELECT_LEX object on the current thd mem_root and
  link it into the relevant lists.

  This function is always followed by mysql_init_select.

  @see mysql_init_select

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

5369
bool
5370
mysql_new_select(LEX *lex, bool move_down)
5371
{
5372
  SELECT_LEX *select_lex;
5373
  THD *thd= lex->thd;
5374 5375
  DBUG_ENTER("mysql_new_select");

5376
  if (!(select_lex= new (thd->mem_root) SELECT_LEX()))
5377
    DBUG_RETURN(1);
5378
  select_lex->select_number= ++thd->select_number;
5379
  select_lex->parent_lex= lex; /* Used in init_query. */
5380 5381
  select_lex->init_query();
  select_lex->init_select();
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5382
  lex->nest_level++;
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5383 5384 5385 5386 5387
  if (lex->nest_level > (int) MAX_SELECT_NESTING)
  {
    my_error(ER_TOO_HIGH_LEVEL_OF_NESTING_FOR_SELECT,MYF(0),MAX_SELECT_NESTING);
    DBUG_RETURN(1);
  }
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igor@rurik.mysql.com committed
5388
  select_lex->nest_level= lex->nest_level;
5389 5390 5391
  /*
    Don't evaluate this subquery during statement prepare even if
    it's a constant one. The flag is switched off in the end of
5392
    mysqld_stmt_prepare.
5393
  */
konstantin@mysql.com's avatar
konstantin@mysql.com committed
5394
  if (thd->stmt_arena->is_stmt_prepare())
5395
    select_lex->uncacheable|= UNCACHEABLE_PREPARE;
5396 5397
  if (move_down)
  {
5398
    SELECT_LEX_UNIT *unit;
5399
    lex->subqueries= TRUE;
5400
    /* first select_lex of subselect or derived table */
5401
    if (!(unit= new (thd->mem_root) SELECT_LEX_UNIT()))
5402
      DBUG_RETURN(1);
5403

5404 5405
    unit->init_query();
    unit->init_select();
5406
    unit->thd= thd;
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bell@sanja.is.com.ua committed
5407
    unit->include_down(lex->current_select);
5408 5409
    unit->link_next= 0;
    unit->link_prev= 0;
5410
    unit->return_to= lex->current_select;
5411
    select_lex->include_down(unit);
5412 5413 5414 5415 5416
    /*
      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;
5417 5418
  }
  else
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5419
  {
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VIEW  
bell@sanja.is.com.ua committed
5420 5421
    if (lex->current_select->order_list.first && !lex->current_select->braces)
    {
5422
      my_error(ER_WRONG_USAGE, MYF(0), "UNION", "ORDER BY");
5423
      DBUG_RETURN(1);
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VIEW  
bell@sanja.is.com.ua committed
5424
    }
5425
    select_lex->include_neighbour(lex->current_select);
5426 5427 5428 5429 5430
    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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5431
  }
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5432

5433
  select_lex->master_unit()->global_parameters= select_lex;
5434
  select_lex->include_global((st_select_lex_node**)&lex->all_selects_list);
5435
  lex->current_select= select_lex;
5436 5437 5438 5439 5440
  /*
    in subquery is SELECT query and we allow resolution of names in SELECT
    list
  */
  select_lex->context.resolve_in_select_list= TRUE;
5441
  DBUG_RETURN(0);
5442
}
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bk@work.mysql.com committed
5443

5444
/**
5445 5446
  Create a select to return the same output as 'SELECT @@var_name'.

5447
  Used for SHOW COUNT(*) [ WARNINGS | ERROR].
5448

5449
  This will crash with a core dump if the variable doesn't exists.
5450

5451
  @param var_name		Variable name
5452 5453 5454 5455
*/

void create_select_for_variable(const char *var_name)
{
5456
  THD *thd;
5457
  LEX *lex;
5458
  LEX_STRING tmp, null_lex_string;
5459 5460
  Item *var;
  char buff[MAX_SYS_VAR_LENGTH*2+4+8], *end;
5461
  DBUG_ENTER("create_select_for_variable");
5462 5463

  thd= current_thd;
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pem@mysql.telia.com committed
5464
  lex= thd->lex;
5465 5466 5467 5468
  mysql_init_select(lex);
  lex->sql_command= SQLCOM_SELECT;
  tmp.str= (char*) var_name;
  tmp.length=strlen(var_name);
5469
  bzero((char*) &null_lex_string.str, sizeof(null_lex_string));
5470 5471 5472 5473
  /*
    We set the name of Item to @@session.var_name because that then is used
    as the column name in the output.
  */
monty@mysql.com's avatar
monty@mysql.com committed
5474 5475 5476 5477 5478 5479
  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);
  }
5480 5481 5482
  DBUG_VOID_RETURN;
}

5483

monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5484 5485
void mysql_init_multi_delete(LEX *lex)
{
5486
  lex->sql_command=  SQLCOM_DELETE_MULTI;
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monty@hundin.mysql.fi committed
5487
  mysql_init_select(lex);
5488 5489
  lex->select_lex.select_limit= 0;
  lex->unit.select_limit_cnt= HA_POS_ERROR;
5490
  lex->select_lex.table_list.save_and_clear(&lex->auxiliary_table_list);
5491
  lex->lock_option= TL_READ_DEFAULT;
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VIEW  
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5492 5493
  lex->query_tables= 0;
  lex->query_tables_last= &lex->query_tables;
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monty@hundin.mysql.fi committed
5494
}
5495

5496

5497 5498 5499 5500
/*
  When you modify mysql_parse(), you may need to mofify
  mysql_test_parse_for_slave() in this same file.
*/
5501

5502 5503
/**
  Parse a query.
kostja@bodhi.(none)'s avatar
kostja@bodhi.(none) committed
5504 5505 5506 5507 5508 5509

  @param       thd     Current thread
  @param       inBuf   Begining of the query text
  @param       length  Length of the query text
  @param[out]  found_semicolon For multi queries, position of the character of
                               the next query in the query text.
5510 5511 5512 5513
*/

void mysql_parse(THD *thd, const char *inBuf, uint length,
                 const char ** found_semicolon)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5514
{
5515
  int error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5516
  DBUG_ENTER("mysql_parse");
5517 5518 5519

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

5520 5521 5522 5523 5524 5525 5526 5527 5528 5529 5530 5531 5532 5533 5534 5535 5536 5537
  /*
    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);
5538

5539
  if (query_cache_send_result_to_client(thd, (char*) inBuf, length) <= 0)
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5540
  {
5541
    LEX *lex= thd->lex;
5542

5543
    Parser_state parser_state(thd, inBuf, length);
5544

5545
    bool err= parse_sql(thd, & parser_state, NULL);
5546
    *found_semicolon= parser_state.m_lip.found_semicolon;
5547

5548
    if (!err)
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5549
    {
hf@deer.(none)'s avatar
hf@deer.(none) committed
5550
#ifndef NO_EMBEDDED_ACCESS_CHECKS
5551
      if (mqh_used && thd->user_connect &&
5552
	  check_mqh(thd, lex->sql_command))
5553 5554 5555 5556
      {
	thd->net.error = 0;
      }
      else
hf@deer.(none)'s avatar
hf@deer.(none) committed
5557
#endif
5558
      {
5559
	if (! thd->is_error())
5560
	{
5561 5562 5563 5564 5565 5566 5567 5568 5569 5570
          /*
            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.
          */
5571 5572 5573 5574
          if (*found_semicolon && (ulong) (*found_semicolon - thd->query()))
            thd->set_query_inner(thd->query(),
                                 (uint32) (*found_semicolon -
                                           thd->query() - 1));
5575
          /* Actually execute the query */
5576 5577 5578 5579 5580
          if (*found_semicolon)
          {
            lex->safe_to_cache_query= 0;
            thd->server_status|= SERVER_MORE_RESULTS_EXISTS;
          }
5581
          lex->set_trg_event_type_for_tables();
5582
          MYSQL_QUERY_EXEC_START(thd->query(),
5583 5584 5585 5586 5587 5588 5589 5590
                                 thd->thread_id,
                                 (char *) (thd->db ? thd->db : ""),
                                 thd->security_ctx->priv_user,
                                 (char *) thd->security_ctx->host_or_ip,
                                 0);

          error= mysql_execute_command(thd);
          MYSQL_QUERY_EXEC_DONE(error);
5591
	}
5592
      }
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monty@hundin.mysql.fi committed
5593 5594
    }
    else
5595
    {
5596
      DBUG_ASSERT(thd->is_error());
5597
      DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
5598
			 thd->is_fatal_error));
5599

5600
      query_cache_abort(&thd->query_cache_tls);
5601
    }
5602 5603 5604 5605 5606 5607
    if (thd->lex->sphead)
    {
      delete thd->lex->sphead;
      thd->lex->sphead= 0;
    }
    lex->unit.cleanup();
5608
    thd_proc_info(thd, "freeing items");
5609
    thd->end_statement();
5610
    thd->cleanup_after_query();
5611
    DBUG_ASSERT(thd->change_list.is_empty());
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5612
  }
5613 5614 5615 5616 5617 5618
  else
  {
    /* There are no multi queries in the cache. */
    *found_semicolon= NULL;
  }

bk@work.mysql.com's avatar
bk@work.mysql.com committed
5619 5620 5621 5622
  DBUG_VOID_RETURN;
}


monty@mysql.com's avatar
monty@mysql.com committed
5623
#ifdef HAVE_REPLICATION
5624 5625 5626 5627
/*
  Usable by the replication SQL thread only: just parse a query to know if it
  can be ignored because of replicate-*-table rules.

5628
  @retval
5629
    0	cannot be ignored
5630
  @retval
5631 5632 5633 5634 5635
    1	can be ignored
*/

bool mysql_test_parse_for_slave(THD *thd, char *inBuf, uint length)
{
5636
  LEX *lex= thd->lex;
5637
  bool error= 0;
monty@mysql.com's avatar
monty@mysql.com committed
5638
  DBUG_ENTER("mysql_test_parse_for_slave");
5639

5640
  Parser_state parser_state(thd, inBuf, length);
5641 5642 5643
  lex_start(thd);
  mysql_reset_thd_for_next_command(thd);

5644
  if (!parse_sql(thd, & parser_state, NULL) &&
5645
      all_tables_not_ok(thd,(TABLE_LIST*) lex->select_lex.table_list.first))
monty@mysql.com's avatar
monty@mysql.com committed
5646
    error= 1;                  /* Ignore question */
5647
  thd->end_statement();
5648
  thd->cleanup_after_query();
monty@mysql.com's avatar
monty@mysql.com committed
5649
  DBUG_RETURN(error);
5650
}
monty@mysql.com's avatar
monty@mysql.com committed
5651
#endif
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bk@work.mysql.com committed
5652

5653

monty@mysql.com's avatar
monty@mysql.com committed
5654

5655 5656 5657 5658 5659 5660
/**
  Store field definition for create.

  @return
    Return 0 if ok
*/
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bk@work.mysql.com committed
5661

5662
bool add_field_to_list(THD *thd, LEX_STRING *field_name, enum_field_types type,
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bk@work.mysql.com committed
5663
		       char *length, char *decimals,
5664
		       uint type_modifier,
5665 5666
		       Item *default_value, Item *on_update_value,
                       LEX_STRING *comment,
5667 5668
		       char *change,
                       List<String> *interval_list, CHARSET_INFO *cs,
5669
		       uint uint_geom_type)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5670
{
5671
  register Create_field *new_field;
5672
  LEX  *lex= thd->lex;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5673 5674
  DBUG_ENTER("add_field_to_list");

5675 5676
  if (check_string_char_length(field_name, "", NAME_CHAR_LEN,
                               system_charset_info, 1))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5677
  {
5678
    my_error(ER_TOO_LONG_IDENT, MYF(0), field_name->str); /* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5679 5680 5681 5682
    DBUG_RETURN(1);				/* purecov: inspected */
  }
  if (type_modifier & PRI_KEY_FLAG)
  {
5683
    Key *key;
5684 5685
    lex->col_list.push_back(new Key_part_spec(*field_name, 0));
    key= new Key(Key::PRIMARY, null_lex_str,
5686 5687 5688
                      &default_key_create_info,
                      0, lex->col_list);
    lex->alter_info.key_list.push_back(key);
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bk@work.mysql.com committed
5689 5690 5691 5692
    lex->col_list.empty();
  }
  if (type_modifier & (UNIQUE_FLAG | UNIQUE_KEY_FLAG))
  {
5693
    Key *key;
5694 5695
    lex->col_list.push_back(new Key_part_spec(*field_name, 0));
    key= new Key(Key::UNIQUE, null_lex_str,
5696 5697 5698
                 &default_key_create_info, 0,
                 lex->col_list);
    lex->alter_info.key_list.push_back(key);
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bk@work.mysql.com committed
5699 5700 5701
    lex->col_list.empty();
  }

5702
  if (default_value)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5703
  {
5704
    /* 
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5705 5706
      Default value should be literal => basic constants =>
      no need fix_fields()
5707 5708 5709
      
      We allow only one function as part of default value - 
      NOW() as default for TIMESTAMP type.
5710
    */
5711 5712
    if (default_value->type() == Item::FUNC_ITEM && 
        !(((Item_func*)default_value)->functype() == Item_func::NOW_FUNC &&
5713
         type == MYSQL_TYPE_TIMESTAMP))
5714
    {
5715
      my_error(ER_INVALID_DEFAULT, MYF(0), field_name->str);
5716 5717 5718
      DBUG_RETURN(1);
    }
    else if (default_value->type() == Item::NULL_ITEM)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5719
    {
5720
      default_value= 0;
5721 5722 5723
      if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) ==
	  NOT_NULL_FLAG)
      {
5724
	my_error(ER_INVALID_DEFAULT, MYF(0), field_name->str);
5725 5726 5727 5728 5729
	DBUG_RETURN(1);
      }
    }
    else if (type_modifier & AUTO_INCREMENT_FLAG)
    {
5730
      my_error(ER_INVALID_DEFAULT, MYF(0), field_name->str);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5731 5732 5733
      DBUG_RETURN(1);
    }
  }
5734

5735
  if (on_update_value && type != MYSQL_TYPE_TIMESTAMP)
5736
  {
5737
    my_error(ER_INVALID_ON_UPDATE, MYF(0), field_name->str);
5738 5739
    DBUG_RETURN(1);
  }
5740

5741
  if (!(new_field= new Create_field()) ||
5742
      new_field->init(thd, field_name->str, type, length, decimals, type_modifier,
5743 5744
                      default_value, on_update_value, comment, change,
                      interval_list, cs, uint_geom_type))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5745
    DBUG_RETURN(1);
5746

5747
  lex->alter_info.create_list.push_back(new_field);
5748 5749 5750 5751
  lex->last_field=new_field;
  DBUG_RETURN(0);
}

5752

5753
/** Store position for column in ALTER TABLE .. ADD column. */
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bk@work.mysql.com committed
5754 5755 5756

void store_position_for_column(const char *name)
{
5757
  current_thd->lex->last_field->after=my_const_cast(char*) (name);
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bk@work.mysql.com committed
5758 5759 5760
}

bool
5761
add_proc_to_list(THD* thd, Item *item)
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bk@work.mysql.com committed
5762 5763 5764 5765
{
  ORDER *order;
  Item	**item_ptr;

monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
5766
  if (!(order = (ORDER *) thd->alloc(sizeof(ORDER)+sizeof(Item*))))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5767 5768 5769 5770 5771
    return 1;
  item_ptr = (Item**) (order+1);
  *item_ptr= item;
  order->item=item_ptr;
  order->free_me=0;
5772
  thd->lex->proc_list.link_in_list((uchar*) order,(uchar**) &order->next);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5773 5774 5775 5776
  return 0;
}


5777 5778 5779
/**
  save order by and tables in own lists.
*/
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5780

monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
5781
bool add_to_list(THD *thd, SQL_LIST &list,Item *item,bool asc)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5782 5783 5784
{
  ORDER *order;
  DBUG_ENTER("add_to_list");
5785
  if (!(order = (ORDER *) thd->alloc(sizeof(ORDER))))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5786
    DBUG_RETURN(1);
5787 5788
  order->item_ptr= item;
  order->item= &order->item_ptr;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5789 5790 5791
  order->asc = asc;
  order->free_me=0;
  order->used=0;
5792
  order->counter_used= 0;
5793
  list.link_in_list((uchar*) order,(uchar**) &order->next);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5794 5795 5796 5797
  DBUG_RETURN(0);
}


5798 5799 5800 5801 5802 5803 5804 5805 5806 5807 5808 5809 5810 5811
/**
  Add a table to list of used tables.

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

  @retval
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
5812
      0		Error
5813 5814
  @retval
    \#	Pointer to TABLE_LIST element added to the total table list
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
5815 5816
*/

monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
5817 5818
TABLE_LIST *st_select_lex::add_table_to_list(THD *thd,
					     Table_ident *table,
5819
					     LEX_STRING *alias,
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
5820 5821
					     ulong table_options,
					     thr_lock_type lock_type,
5822
					     List<Index_hint> *index_hints_arg,
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
5823
                                             LEX_STRING *option)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5824 5825
{
  register TABLE_LIST *ptr;
5826
  TABLE_LIST *previous_table_ref; /* The table preceding the current one. */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5827
  char *alias_str;
5828
  LEX *lex= thd->lex;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5829
  DBUG_ENTER("add_table_to_list");
5830
  LINT_INIT(previous_table_ref);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5831 5832 5833 5834

  if (!table)
    DBUG_RETURN(0);				// End of memory
  alias_str= alias ? alias->str : table->table.str;
5835 5836
  if (!test(table_options & TL_OPTION_ALIAS) && 
      check_table_name(table->table.str, table->table.length))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5837
  {
5838
    my_error(ER_WRONG_TABLE_NAME, MYF(0), table->table.str);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5839 5840
    DBUG_RETURN(0);
  }
5841 5842

  if (table->is_derived_table() == FALSE && table->db.str &&
5843
      check_db_name(&table->db))
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
5844 5845 5846 5847
  {
    my_error(ER_WRONG_DB_NAME, MYF(0), table->db.str);
    DBUG_RETURN(0);
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5848 5849

  if (!alias)					/* Alias is case sensitive */
5850 5851 5852
  {
    if (table->sel)
    {
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bell@sanja.is.com.ua committed
5853 5854
      my_message(ER_DERIVED_MUST_HAVE_ALIAS,
                 ER(ER_DERIVED_MUST_HAVE_ALIAS), MYF(0));
5855 5856
      DBUG_RETURN(0);
    }
5857
    if (!(alias_str= (char*) thd->memdup(alias_str,table->table.length+1)))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5858
      DBUG_RETURN(0);
5859
  }
5860
  if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5861
    DBUG_RETURN(0);				/* purecov: inspected */
peter@mysql.com's avatar
peter@mysql.com committed
5862
  if (table->db.str)
5863
  {
5864
    ptr->is_fqtn= TRUE;
5865 5866 5867
    ptr->db= table->db.str;
    ptr->db_length= table->db.length;
  }
5868
  else if (lex->copy_db_to(&ptr->db, &ptr->db_length))
5869
    DBUG_RETURN(0);
5870 5871
  else
    ptr->is_fqtn= FALSE;
peter@mysql.com's avatar
peter@mysql.com committed
5872

5873
  ptr->alias= alias_str;
5874
  ptr->is_alias= alias ? TRUE : FALSE;
5875
  if (lower_case_table_names && table->table.length)
5876
    table->table.length= my_casedn_str(files_charset_info, table->table.str);
5877 5878
  ptr->table_name=table->table.str;
  ptr->table_name_length=table->table.length;
5879
  ptr->lock_type=   lock_type;
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
5880
  ptr->updating=    test(table_options & TL_OPTION_UPDATING);
5881
  /* TODO: remove TL_OPTION_FORCE_INDEX as it looks like it's not used */
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
5882
  ptr->force_index= test(table_options & TL_OPTION_FORCE_INDEX);
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
5883
  ptr->ignore_leaves= test(table_options & TL_OPTION_IGNORE_LEAVES);
5884
  ptr->derived=	    table->sel;
5885
  if (!ptr->derived && is_infoschema_db(ptr->db, ptr->db_length))
5886
  {
5887 5888 5889 5890 5891 5892 5893 5894 5895 5896 5897 5898 5899
    ST_SCHEMA_TABLE *schema_table;
    if (ptr->updating &&
        /* Special cases which are processed by commands itself */
        lex->sql_command != SQLCOM_CHECK &&
        lex->sql_command != SQLCOM_CHECKSUM)
    {
      my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
               thd->security_ctx->priv_user,
               thd->security_ctx->priv_host,
               INFORMATION_SCHEMA_NAME.str);
      DBUG_RETURN(0);
    }
    schema_table= find_schema_table(thd, ptr->table_name);
5900 5901
    if (!schema_table ||
        (schema_table->hidden && 
gluh@eagle.(none)'s avatar
gluh@eagle.(none) committed
5902
         ((sql_command_flags[lex->sql_command] & CF_STATUS_COMMAND) == 0 || 
5903 5904 5905
          /*
            this check is used for show columns|keys from I_S hidden table
          */
5906 5907
          lex->sql_command == SQLCOM_SHOW_FIELDS ||
          lex->sql_command == SQLCOM_SHOW_KEYS)))
5908
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5909
      my_error(ER_UNKNOWN_TABLE, MYF(0),
5910
               ptr->table_name, INFORMATION_SCHEMA_NAME.str);
5911 5912
      DBUG_RETURN(0);
    }
5913
    ptr->schema_table_name= ptr->table_name;
5914 5915
    ptr->schema_table= schema_table;
  }
5916
  ptr->select_lex=  lex->current_select;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5917
  ptr->cacheable_table= 1;
5918
  ptr->index_hints= index_hints_arg;
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
5919
  ptr->option= option ? option->str : 0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5920
  /* check that used name is unique */
5921
  if (lock_type != TL_IGNORE)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5922
  {
timour@mysql.com's avatar
timour@mysql.com committed
5923 5924 5925 5926
    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 ;
5927
	 tables ;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
5928
	 tables=tables->next_local)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5929
    {
5930 5931
      if (!my_strcasecmp(table_alias_charset, alias_str, tables->alias) &&
	  !strcmp(ptr->db, tables->db))
5932
      {
5933
	my_error(ER_NONUNIQ_TABLE, MYF(0), alias_str); /* purecov: tested */
5934 5935
	DBUG_RETURN(0);				/* purecov: tested */
      }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5936 5937
    }
  }
5938 5939 5940
  /* Store the table reference preceding the current one. */
  if (table_list.elements > 0)
  {
5941 5942 5943
    /*
      table_list.next points to the last inserted TABLE_LIST->next_local'
      element
5944
      We don't use the offsetof() macro here to avoid warnings from gcc
5945
    */
5946 5947 5948
    previous_table_ref= (TABLE_LIST*) ((char*) table_list.next -
                                       ((char*) &(ptr->next_local) -
                                        (char*) ptr));
5949 5950 5951 5952 5953 5954 5955 5956
    /*
      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;
5957
  }
5958

5959 5960 5961 5962 5963 5964
  /*
    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'.
  */
5965
  table_list.link_in_list((uchar*) ptr, (uchar**) &ptr->next_local);
5966
  ptr->next_name_resolution_table= NULL;
5967
  /* Link table in global list (all used tables) */
5968
  lex->add_to_query_tables(ptr);
5969 5970 5971
  ptr->mdl_request.init(MDL_key::TABLE, ptr->db, ptr->table_name,
                        (ptr->lock_type >= TL_WRITE_ALLOW_WRITE) ?
                        MDL_SHARED_WRITE : MDL_SHARED_READ);
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bk@work.mysql.com committed
5972 5973 5974
  DBUG_RETURN(ptr);
}

monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
5975

5976 5977
/**
  Initialize a new table list for a nested join.
5978

5979 5980 5981 5982 5983 5984 5985 5986
    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.

5987 5988 5989 5990 5991 5992
  @param thd         current thread

  @retval
    0   if success
  @retval
    1   otherwise
5993 5994 5995 5996 5997 5998 5999
*/

bool st_select_lex::init_nested_join(THD *thd)
{
  TABLE_LIST *ptr;
  NESTED_JOIN *nested_join;
  DBUG_ENTER("init_nested_join");
6000

6001 6002
  if (!(ptr= (TABLE_LIST*) thd->calloc(ALIGN_SIZE(sizeof(TABLE_LIST))+
                                       sizeof(NESTED_JOIN))))
6003
    DBUG_RETURN(1);
6004
  nested_join= ptr->nested_join=
6005
    ((NESTED_JOIN*) ((uchar*) ptr + ALIGN_SIZE(sizeof(TABLE_LIST))));
6006

6007 6008 6009
  join_list->push_front(ptr);
  ptr->embedding= embedding;
  ptr->join_list= join_list;
6010
  ptr->alias= (char*) "(nested_join)";
6011 6012 6013 6014 6015 6016 6017
  embedding= ptr;
  join_list= &nested_join->join_list;
  join_list->empty();
  DBUG_RETURN(0);
}


6018 6019
/**
  End a nested join table list.
6020 6021 6022

    The function returns to the previous join nest level.
    If the current level contains only one member, the function
6023
    moves it one level up, eliminating the nest.
6024

6025 6026 6027 6028 6029
  @param thd         current thread

  @return
    - Pointer to TABLE_LIST element added to the total table list, if success
    - 0, otherwise
6030 6031 6032 6033 6034
*/

TABLE_LIST *st_select_lex::end_nested_join(THD *thd)
{
  TABLE_LIST *ptr;
6035
  NESTED_JOIN *nested_join;
6036
  DBUG_ENTER("end_nested_join");
6037

6038
  DBUG_ASSERT(embedding);
6039 6040 6041
  ptr= embedding;
  join_list= ptr->join_list;
  embedding= ptr->embedding;
6042
  nested_join= ptr->nested_join;
6043 6044 6045 6046 6047 6048 6049 6050 6051
  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;
  }
6052
  else if (nested_join->join_list.elements == 0)
6053 6054
  {
    join_list->pop();
6055
    ptr= 0;                                     // return value
6056
  }
6057 6058 6059 6060
  DBUG_RETURN(ptr);
}


6061 6062
/**
  Nest last join operation.
6063 6064 6065

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

6066
  @param thd         current thread
6067

6068
  @retval
6069
    0  Error
6070 6071
  @retval
    \#  Pointer to TABLE_LIST element created for the new nested join
6072 6073 6074 6075 6076 6077
*/

TABLE_LIST *st_select_lex::nest_last_join(THD *thd)
{
  TABLE_LIST *ptr;
  NESTED_JOIN *nested_join;
6078
  List<TABLE_LIST> *embedded_list;
6079
  DBUG_ENTER("nest_last_join");
6080

6081 6082
  if (!(ptr= (TABLE_LIST*) thd->calloc(ALIGN_SIZE(sizeof(TABLE_LIST))+
                                       sizeof(NESTED_JOIN))))
6083
    DBUG_RETURN(0);
6084
  nested_join= ptr->nested_join=
6085
    ((NESTED_JOIN*) ((uchar*) ptr + ALIGN_SIZE(sizeof(TABLE_LIST))));
6086

6087 6088
  ptr->embedding= embedding;
  ptr->join_list= join_list;
6089
  ptr->alias= (char*) "(nest_last_join)";
6090
  embedded_list= &nested_join->join_list;
6091
  embedded_list->empty();
6092 6093

  for (uint i=0; i < 2; i++)
6094 6095 6096 6097 6098
  {
    TABLE_LIST *table= join_list->pop();
    table->join_list= embedded_list;
    table->embedding= ptr;
    embedded_list->push_back(table);
6099 6100 6101 6102 6103 6104 6105
    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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6106 6107
      if (prev_join_using)
        ptr->join_using_fields= prev_join_using;
6108
    }
6109 6110 6111 6112 6113 6114 6115
  }
  join_list->push_front(ptr);
  nested_join->used_tables= nested_join->not_null_tables= (table_map) 0;
  DBUG_RETURN(ptr);
}


6116 6117
/**
  Add a table to the current join list.
6118 6119 6120 6121 6122 6123

    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).

6124 6125 6126
  @param table       the table to add

  @return
6127 6128 6129 6130 6131 6132 6133 6134 6135 6136 6137 6138 6139
    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;
}


6140 6141
/**
  Convert a right join into equivalent left join.
6142 6143

    The function takes the current join list t[0],t[1] ... and
6144 6145 6146 6147 6148 6149
    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
6150
  @verbatim
6151 6152 6153 6154 6155 6156 6157 6158 6159 6160 6161
    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
6162
   @endverbatim
6163

6164
  @param thd         current thread
6165

6166 6167 6168
  @return
    - Pointer to the table representing the inner table, if success
    - 0, otherwise
6169 6170
*/

6171
TABLE_LIST *st_select_lex::convert_right_join()
6172 6173
{
  TABLE_LIST *tab2= join_list->pop();
6174
  TABLE_LIST *tab1= join_list->pop();
6175 6176 6177 6178 6179 6180 6181 6182 6183
  DBUG_ENTER("convert_right_join");

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

  DBUG_RETURN(tab1);
}

6184 6185
/**
  Set lock for all tables in current select level.
6186

6187
  @param lock_type			Lock to set for tables
6188

6189
  @note
6190 6191 6192 6193 6194
    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
*/

6195
void st_select_lex::set_lock_for_tables(thr_lock_type lock_type)
6196 6197 6198 6199 6200
{
  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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VIEW  
bell@sanja.is.com.ua committed
6201 6202 6203
  for (TABLE_LIST *tables= (TABLE_LIST*) table_list.first;
       tables;
       tables= tables->next_local)
6204 6205 6206
  {
    tables->lock_type= lock_type;
    tables->updating=  for_update;
6207 6208
    tables->mdl_request.set_type((lock_type >= TL_WRITE_ALLOW_WRITE) ?
                                 MDL_SHARED_WRITE : MDL_SHARED_READ);
6209 6210 6211 6212
  }
  DBUG_VOID_RETURN;
}

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monty@tik.mysql.fi committed
6213

6214 6215
/**
  Create a fake SELECT_LEX for a unit.
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
6216 6217 6218 6219

    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
6220
    @verbatim
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
6221
    (SELECT ... ORDER BY order_list [LIMIT n]) ORDER BY ... 
6222
    @endvarbatim
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igor@rurik.mysql.com committed
6223
    or of the form
6224
    @varbatim
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
6225
    (SELECT ... ORDER BY LIMIT n) ORDER BY ...
6226
    @endvarbatim
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
6227
  
6228 6229 6230
  @param thd_arg		   thread handle

  @note
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6231 6232 6233
    The object is used to retrieve rows from the temporary table
    where the result on the union is obtained.

6234
  @retval
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igor@rurik.mysql.com committed
6235
    1     on failure to create the object
6236
  @retval
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6237 6238 6239
    0     on success
*/

malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
6240
bool st_select_lex_unit::add_fake_select_lex(THD *thd_arg)
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
6241 6242 6243 6244
{
  SELECT_LEX *first_sl= first_select();
  DBUG_ENTER("add_fake_select_lex");
  DBUG_ASSERT(!fake_select_lex);
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igor@rurik.mysql.com committed
6245

malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
6246
  if (!(fake_select_lex= new (thd_arg->mem_root) SELECT_LEX()))
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
6247 6248 6249 6250
      DBUG_RETURN(1);
  fake_select_lex->include_standalone(this, 
                                      (SELECT_LEX_NODE**)&fake_select_lex);
  fake_select_lex->select_number= INT_MAX;
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
6251
  fake_select_lex->parent_lex= thd_arg->lex; /* Used in init_query. */
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
6252 6253
  fake_select_lex->make_empty_select();
  fake_select_lex->linkage= GLOBAL_OPTIONS_TYPE;
6254 6255
  fake_select_lex->select_limit= 0;

igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
6256
  fake_select_lex->context.outer_context=first_sl->context.outer_context;
6257 6258 6259
  /* 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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igor@rurik.mysql.com committed
6260

6261
  if (!is_union())
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
6262 6263 6264 6265 6266 6267 6268 6269 6270
  {
    /* 
      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;
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
6271
    thd_arg->lex->current_select= fake_select_lex;
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
6272
  }
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
6273
  thd_arg->lex->pop_context();
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
6274 6275 6276
  DBUG_RETURN(0);
}

6277

6278
/**
6279 6280
  Push a new name resolution context for a JOIN ... ON clause to the
  context stack of a query block.
6281 6282

    Create a new name resolution context for a JOIN ... ON clause,
6283 6284 6285
    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.
6286

6287 6288 6289 6290 6291
  @param thd       pointer to current thread
  @param left_op   left  operand of the JOIN
  @param right_op  rigth operand of the JOIN

  @retval
6292
    FALSE  if all is OK
6293
  @retval
6294
    TRUE   if a memory allocation error occured
6295 6296
*/

6297 6298 6299
bool
push_new_name_resolution_context(THD *thd,
                                 TABLE_LIST *left_op, TABLE_LIST *right_op)
6300 6301
{
  Name_resolution_context *on_context;
6302
  if (!(on_context= new (thd->mem_root) Name_resolution_context))
6303
    return TRUE;
6304 6305 6306 6307 6308
  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();
6309
  return thd->lex->push_context(on_context);
6310 6311 6312
}


6313
/**
6314 6315 6316 6317
  Add an ON condition to the second operand of a JOIN ... ON.

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

6318 6319
  @param b     the second operand of a JOIN ... ON
  @param expr  the condition to be added to the ON clause
6320

6321
  @retval
6322
    FALSE  if there was some error
6323
  @retval
6324 6325 6326 6327
    TRUE   if all is OK
*/

void add_join_on(TABLE_LIST *b, Item *expr)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6328
{
6329
  if (expr)
6330
  {
6331
    if (!b->on_expr)
6332
      b->on_expr= expr;
6333 6334
    else
    {
6335 6336 6337 6338 6339 6340
      /*
        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);
6341 6342
    }
    b->on_expr->top_level_item();
6343
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6344 6345 6346
}


6347
/**
6348 6349
  Mark that there is a NATURAL JOIN or JOIN ... USING between two
  tables.
6350

6351 6352 6353 6354 6355 6356 6357 6358 6359 6360
    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
6361
  @verbatim
6362 6363 6364
    SELECT * FROM t1 NATURAL LEFT JOIN t2
     <=>
    SELECT * FROM t1 LEFT JOIN t2 ON (t1.i=t2.i and t1.j=t2.j ... )
6365

6366 6367 6368
    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>)
6369

6370 6371 6372
    SELECT * FROM t1 JOIN t2 USING(j) WHERE <some_cond>
     <=>
    SELECT * FROM t1, t2 WHERE (t1.j=t2.j and <some_cond>)
6373 6374 6375 6376 6377
   @endverbatim

  @param a		  Left join argument
  @param b		  Right join argument
  @param using_fields    Field names from USING clause
6378 6379
*/

malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
6380 6381
void add_join_natural(TABLE_LIST *a, TABLE_LIST *b, List<String> *using_fields,
                      SELECT_LEX *lex)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6382
{
6383
  b->natural_join= a;
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
6384
  lex->prev_join_using= using_fields;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6385 6386
}

6387

6388
/**
6389 6390
  Reload/resets privileges and the different caches.

6391 6392 6393 6394
  @param thd Thread handler (can be NULL!)
  @param options What should be reset/reloaded (tables, privileges, slave...)
  @param tables Tables to flush (if any)
  @param write_to_binlog True if we can write to the binlog.
6395
               
6396 6397 6398 6399 6400 6401 6402 6403
  @note Depending on 'options', it may be very bad to write the
    query to the binlog (e.g. FLUSH SLAVE); this is a
    pointer where reload_acl_and_cache() will put 0 if
    it thinks we really should not write to the binlog.
    Otherwise it will put 1.

  @return Error status code
    @retval 0 Ok
6404
    @retval !=0  Error; thd->killed is set or thd->is_error() is true
6405 6406
*/

6407 6408
bool reload_acl_and_cache(THD *thd, ulong options, TABLE_LIST *tables,
                          bool *write_to_binlog)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6409 6410 6411
{
  bool result=0;
  select_errors=0;				/* Write if more errors */
6412
  bool tmp_write_to_binlog= 1;
6413

6414
  DBUG_ASSERT(!thd || !thd->in_sub_stmt);
6415

hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
6416
#ifndef NO_EMBEDDED_ACCESS_CHECKS
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6417 6418
  if (options & REFRESH_GRANT)
  {
6419 6420 6421 6422 6423 6424
    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)))
6425 6426
    {
      thd->thread_stack= (char*) &tmp_thd;
6427
      thd->store_globals();
6428
    }
6429

6430 6431
    if (thd)
    {
6432 6433
      bool reload_acl_failed= acl_reload(thd);
      bool reload_grants_failed= grant_reload(thd);
Kristofer Pettersson's avatar
Kristofer Pettersson committed
6434
      bool reload_servers_failed= servers_reload(thd);
6435

Kristofer Pettersson's avatar
Kristofer Pettersson committed
6436
      if (reload_acl_failed || reload_grants_failed || reload_servers_failed)
6437
      {
6438
        result= 1;
6439 6440 6441 6442 6443 6444
        /*
          When an error is returned, my_message may have not been called and
          the client will hang waiting for a response.
        */
        my_error(ER_UNKNOWN_ERROR, MYF(0), "FLUSH PRIVILEGES failed");
      }
6445
    }
6446

6447 6448 6449 6450 6451 6452 6453
    if (tmp_thd)
    {
      delete tmp_thd;
      /* Remember that we don't have a THD */
      my_pthread_setspecific_ptr(THR_THD,  0);
      thd= 0;
    }
6454
    reset_mqh((LEX_USER *)NULL, TRUE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6455
  }
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
6456
#endif
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6457 6458
  if (options & REFRESH_LOG)
  {
6459
    /*
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
6460
      Flush the normal query log, the update log, the binary log,
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
6461 6462
      the slow query log, the relay log (if it exists) and the log
      tables.
6463
    */
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
6464

6465 6466 6467 6468 6469 6470 6471 6472 6473 6474 6475 6476 6477 6478 6479 6480 6481 6482 6483 6484 6485 6486 6487 6488
    options|= REFRESH_BINARY_LOG;
    options|= REFRESH_RELAY_LOG;
    options|= REFRESH_SLOW_LOG;
    options|= REFRESH_GENERAL_LOG;
    options|= REFRESH_ENGINE_LOG;
    options|= REFRESH_ERROR_LOG;
  }

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

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

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

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

  if (options & REFRESH_BINARY_LOG)
  {
6489
    /*
monty@mysql.com's avatar
monty@mysql.com committed
6490 6491 6492 6493
      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)
6494 6495
    */
    tmp_write_to_binlog= 0;
6496
    if (mysql_bin_log.is_open())
6497
      mysql_bin_log.rotate_and_purge(RP_FORCE_ROTATE);
6498 6499 6500
  }
  if (options & REFRESH_RELAY_LOG)
  {
6501
#ifdef HAVE_REPLICATION
Marc Alff's avatar
Marc Alff committed
6502
    mysql_mutex_lock(&LOCK_active_mi);
6503
    rotate_relay_log(active_mi);
Marc Alff's avatar
Marc Alff committed
6504
    mysql_mutex_unlock(&LOCK_active_mi);
6505
#endif
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6506
  }
6507
#ifdef HAVE_QUERY_CACHE
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
6508 6509
  if (options & REFRESH_QUERY_CACHE_FREE)
  {
6510
    query_cache.pack();				// FLUSH QUERY CACHE
6511
    options &= ~REFRESH_QUERY_CACHE;    // Don't flush cache, just free memory
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
6512 6513 6514
  }
  if (options & (REFRESH_TABLES | REFRESH_QUERY_CACHE))
  {
6515
    query_cache.flush();			// RESET QUERY CACHE
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
6516
  }
6517
#endif /*HAVE_QUERY_CACHE*/
6518

6519 6520
  DBUG_ASSERT(!thd || thd->locked_tables_mode ||
              !thd->mdl_context.has_locks() ||
6521
              thd->handler_tables_hash.records ||
6522
              thd->global_read_lock.is_acquired());
6523

6524 6525 6526 6527 6528
  /*
    Note that if REFRESH_READ_LOCK bit is set then REFRESH_TABLES is set too
    (see sql_yacc.yy)
  */
  if (options & (REFRESH_TABLES | REFRESH_READ_LOCK)) 
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6529
  {
6530
    if ((options & REFRESH_READ_LOCK) && thd)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6531
    {
6532
      /*
6533 6534 6535 6536
        On the first hand we need write lock on the tables to be flushed,
        on the other hand we must not try to aspire a global read lock
        if we have a write locked table as this would lead to a deadlock
        when trying to reopen (and re-lock) the table after the flush.
6537
      */
Konstantin Osipov's avatar
Konstantin Osipov committed
6538
      if (thd->locked_tables_mode)
6539
      {
6540 6541
        my_error(ER_LOCK_OR_ACTIVE_TRANSACTION, MYF(0));
        return 1;
6542
      }
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
6543 6544 6545 6546
      /*
	Writing to the binlog could cause deadlocks, as we don't log
	UNLOCK TABLES
      */
6547
      tmp_write_to_binlog= 0;
6548
      if (thd->global_read_lock.lock_global_read_lock(thd))
6549
	return 1;                               // Killed
Kristofer Pettersson's avatar
Kristofer Pettersson committed
6550
      if (close_cached_tables(thd, tables, FALSE, (options & REFRESH_FAST) ?
6551
                              FALSE : TRUE))
6552 6553
          result= 1;
      
6554
      if (thd->global_read_lock.make_global_read_lock_block_commit(thd)) // Killed
6555 6556
      {
        /* Don't leave things in a half-locked state */
6557
        thd->global_read_lock.unlock_global_read_lock(thd);
6558 6559
        return 1;
      }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6560
    }
6561
    else
6562
    {
Konstantin Osipov's avatar
Konstantin Osipov committed
6563
      if (thd && thd->locked_tables_mode)
6564 6565 6566 6567 6568 6569 6570 6571
      {
        /*
          If we are under LOCK TABLES we should have a write
          lock on tables which we are going to flush.
        */
        if (tables)
        {
          for (TABLE_LIST *t= tables; t; t= t->next_local)
6572 6573
            if (!find_table_for_mdl_upgrade(thd->open_tables, t->db,
                                            t->table_name, FALSE))
6574 6575 6576 6577 6578 6579
              return 1;
        }
        else
        {
          for (TABLE *tab= thd->open_tables; tab; tab= tab->next)
          {
6580
            if (! tab->mdl_ticket->is_upgradable_or_exclusive())
6581 6582 6583 6584 6585 6586 6587 6588 6589
            {
              my_error(ER_TABLE_NOT_LOCKED_FOR_WRITE, MYF(0),
                       tab->s->table_name.str);
              return 1;
            }
          }
        }
      }

Kristofer Pettersson's avatar
Kristofer Pettersson committed
6590
      if (close_cached_tables(thd, tables, FALSE, (options & REFRESH_FAST) ?
6591
                              FALSE : TRUE))
6592 6593
        result= 1;
    }
6594
    my_dbopt_cleanup();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6595 6596 6597
  }
  if (options & REFRESH_HOSTS)
    hostname_cache_refresh();
monty@mysql.com's avatar
monty@mysql.com committed
6598
  if (thd && (options & REFRESH_STATUS))
6599
    refresh_status(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6600 6601
  if (options & REFRESH_THREADS)
    flush_thread_cache();
6602
#ifdef HAVE_REPLICATION
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6603
  if (options & REFRESH_MASTER)
6604
  {
6605
    DBUG_ASSERT(thd);
6606
    tmp_write_to_binlog= 0;
6607
    if (reset_master(thd))
6608
    {
6609
      result=1;
6610
    }
6611
  }
6612
#endif
6613
#ifdef OPENSSL
6614 6615
   if (options & REFRESH_DES_KEY_FILE)
   {
6616 6617
     if (des_key_file && load_des_key_file(des_key_file))
         result= 1;
6618 6619
   }
#endif
6620
#ifdef HAVE_REPLICATION
6621 6622
 if (options & REFRESH_SLAVE)
 {
6623
   tmp_write_to_binlog= 0;
Marc Alff's avatar
Marc Alff committed
6624
   mysql_mutex_lock(&LOCK_active_mi);
6625
   if (reset_slave(thd, active_mi))
6626
     result=1;
Marc Alff's avatar
Marc Alff committed
6627
   mysql_mutex_unlock(&LOCK_active_mi);
6628
 }
6629
#endif
6630
 if (options & REFRESH_USER_RESOURCES)
6631
   reset_mqh((LEX_USER *) NULL, 0);             /* purecov: inspected */
6632
 *write_to_binlog= tmp_write_to_binlog;
6633 6634 6635
 /*
   If the query was killed then this function must fail.
 */
6636
 return result || (thd ? thd->killed : 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6637 6638
}

6639

6640 6641
/**
  kill on thread.
6642

6643 6644 6645
  @param thd			Thread class
  @param id			Thread id
  @param only_kill_query        Should it kill the query or the connection
6646

6647
  @note
6648 6649 6650
    This is written such that we have a short lock on LOCK_thread_count
*/

6651
uint kill_one_thread(THD *thd, ulong id, bool only_kill_query)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6652 6653 6654
{
  THD *tmp;
  uint error=ER_NO_SUCH_THREAD;
6655 6656
  DBUG_ENTER("kill_one_thread");
  DBUG_PRINT("enter", ("id=%lu only_kill=%d", id, only_kill_query));
Marc Alff's avatar
Marc Alff committed
6657
  mysql_mutex_lock(&LOCK_thread_count); // For unlink from list
6658
  I_List_iterator<THD> it(threads);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6659 6660
  while ((tmp=it++))
  {
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
6661 6662
    if (tmp->command == COM_DAEMON)
      continue;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6663 6664
    if (tmp->thread_id == id)
    {
Marc Alff's avatar
Marc Alff committed
6665
      mysql_mutex_lock(&tmp->LOCK_thd_data);    // Lock from delete
6666
      break;
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bk@work.mysql.com committed
6667 6668
    }
  }
Marc Alff's avatar
Marc Alff committed
6669
  mysql_mutex_unlock(&LOCK_thread_count);
6670 6671
  if (tmp)
  {
6672 6673 6674 6675 6676

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

6677 6678 6679
      KILLer: thd->security_ctx->user could in theory be NULL while
      we're still in "unauthenticated" state. This is a theoretical
      case (the code suggests this could happen, so we play it safe).
6680

6681
      KILLee: tmp->security_ctx->user will be NULL for system threads.
6682
      We need to check so Jane Random User doesn't crash the server
6683 6684
      when trying to kill a) system threads or b) unauthenticated users'
      threads (Bug#43748).
6685

6686
      If user of both killer and killee are non-NULL, proceed with
6687 6688 6689
      slayage if both are string-equal.
    */

6690
    if ((thd->security_ctx->master_access & SUPER_ACL) ||
6691
        thd->security_ctx->user_matches(tmp->security_ctx))
6692
    {
hf@genie.(none)'s avatar
SCRUM  
hf@genie.(none) committed
6693
      tmp->awake(only_kill_query ? THD::KILL_QUERY : THD::KILL_CONNECTION);
6694 6695 6696 6697
      error=0;
    }
    else
      error=ER_KILL_DENIED_ERROR;
Marc Alff's avatar
Marc Alff committed
6698
    mysql_mutex_unlock(&tmp->LOCK_thd_data);
6699
  }
6700 6701 6702 6703
  DBUG_PRINT("exit", ("%d", error));
  DBUG_RETURN(error);
}

6704

6705 6706 6707 6708 6709 6710 6711 6712 6713 6714 6715 6716 6717 6718
/*
  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)))
6719
    my_ok(thd);
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bk@work.mysql.com committed
6720
  else
6721
    my_error(error, MYF(0), id);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6722 6723
}

timour@mysql.com's avatar
timour@mysql.com committed
6724

6725
/** If pointer is not a null pointer, append filename to it. */
6726

cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
6727 6728
bool append_file_to_dir(THD *thd, const char **filename_ptr,
                        const char *table_name)
6729
{
6730
  char buff[FN_REFLEN],*ptr, *end;
6731 6732 6733 6734 6735 6736 6737
  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))
  {
6738
    my_error(ER_WRONG_TABLE_NAME, MYF(0), *filename_ptr);
6739 6740 6741 6742
    return 1;
  }
  /* Fix is using unix filename format on dos */
  strmov(buff,*filename_ptr);
6743
  end=convert_dirname(buff, *filename_ptr, NullS);
6744
  if (!(ptr= (char*) thd->alloc((size_t) (end-buff) + strlen(table_name)+1)))
6745 6746
    return 1;					// End of memory
  *filename_ptr=ptr;
6747
  strxmov(ptr,buff,table_name,NullS);
6748 6749
  return 0;
}
6750

6751

6752 6753
/**
  Check if the select is a simple select (not an union).
6754

6755
  @retval
6756
    0	ok
6757
  @retval
6758 6759 6760 6761 6762 6763
    1	error	; In this case the error messege is sent to the client
*/

bool check_simple_select()
{
  THD *thd= current_thd;
6764 6765
  LEX *lex= thd->lex;
  if (lex->current_select != &lex->select_lex)
6766 6767
  {
    char command[80];
6768
    Lex_input_stream *lip= & thd->m_parser_state->m_lip;
6769 6770
    strmake(command, lip->yylval->symbol.str,
	    min(lip->yylval->symbol.length, sizeof(command)-1));
6771
    my_error(ER_CANT_USE_OPTION_HERE, MYF(0), command);
6772 6773 6774 6775
    return 1;
  }
  return 0;
}
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6776

6777

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bell@sanja.is.com.ua committed
6778
Comp_creator *comp_eq_creator(bool invert)
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bell@sanja.is.com.ua committed
6779
{
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bell@sanja.is.com.ua committed
6780
  return invert?(Comp_creator *)&ne_creator:(Comp_creator *)&eq_creator;
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bell@sanja.is.com.ua committed
6781 6782
}

6783

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bell@sanja.is.com.ua committed
6784
Comp_creator *comp_ge_creator(bool invert)
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bell@sanja.is.com.ua committed
6785
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6786
  return invert?(Comp_creator *)&lt_creator:(Comp_creator *)&ge_creator;
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bell@sanja.is.com.ua committed
6787 6788
}

6789

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bell@sanja.is.com.ua committed
6790
Comp_creator *comp_gt_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6791
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6792
  return invert?(Comp_creator *)&le_creator:(Comp_creator *)&gt_creator;
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bell@sanja.is.com.ua committed
6793 6794
}

6795

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bell@sanja.is.com.ua committed
6796
Comp_creator *comp_le_creator(bool invert)
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bell@sanja.is.com.ua committed
6797
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6798
  return invert?(Comp_creator *)&gt_creator:(Comp_creator *)&le_creator;
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bell@sanja.is.com.ua committed
6799 6800
}

6801

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bell@sanja.is.com.ua committed
6802
Comp_creator *comp_lt_creator(bool invert)
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bell@sanja.is.com.ua committed
6803
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6804
  return invert?(Comp_creator *)&ge_creator:(Comp_creator *)&lt_creator;
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bell@sanja.is.com.ua committed
6805 6806
}

6807

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bell@sanja.is.com.ua committed
6808
Comp_creator *comp_ne_creator(bool invert)
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bell@sanja.is.com.ua committed
6809
{
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bell@sanja.is.com.ua committed
6810
  return invert?(Comp_creator *)&eq_creator:(Comp_creator *)&ne_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6811
}
6812 6813


6814 6815
/**
  Construct ALL/ANY/SOME subquery Item.
6816

6817 6818 6819 6820
  @param left_expr   pointer to left expression
  @param cmp         compare function creator
  @param all         true if we create ALL subquery
  @param select_lex  pointer on parsed subquery structure
6821

6822
  @return
6823 6824 6825 6826 6827 6828 6829
    constructed Item (or 0 if out of memory)
*/
Item * all_any_subquery_creator(Item *left_expr,
				chooser_compare_func_creator cmp,
				bool all,
				SELECT_LEX *select_lex)
{
serg@serg.mylan's avatar
serg@serg.mylan committed
6830
  if ((cmp == &comp_eq_creator) && !all)       //  = ANY <=> IN
6831
    return new Item_in_subselect(left_expr, select_lex);
serg@serg.mylan's avatar
serg@serg.mylan committed
6832 6833

  if ((cmp == &comp_ne_creator) && all)        // <> ALL <=> NOT IN
6834 6835 6836
    return new Item_func_not(new Item_in_subselect(left_expr, select_lex));

  Item_allany_subselect *it=
6837
    new Item_allany_subselect(left_expr, cmp, select_lex, all);
6838
  if (all)
6839
    return it->upper_item= new Item_func_not_all(it);	/* ALL */
6840

6841
  return it->upper_item= new Item_func_nop_all(it);      /* ANY/SOME */
6842
}
6843 6844


6845 6846
/**
  Multi update query pre-check.
6847

6848 6849
  @param thd		Thread handler
  @param tables	Global/local table list (have to be the same)
6850

6851
  @retval
6852
    FALSE OK
6853
  @retval
6854
    TRUE  Error
6855
*/
6856

6857
bool multi_update_precheck(THD *thd, TABLE_LIST *tables)
6858 6859 6860 6861 6862
{
  const char *msg= 0;
  TABLE_LIST *table;
  LEX *lex= thd->lex;
  SELECT_LEX *select_lex= &lex->select_lex;
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VIEW  
bell@sanja.is.com.ua committed
6863
  DBUG_ENTER("multi_update_precheck");
6864 6865 6866

  if (select_lex->item_list.elements != lex->value_list.elements)
  {
6867
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
6868
    DBUG_RETURN(TRUE);
6869 6870 6871 6872 6873
  }
  /*
    Ensure that we have UPDATE or SELECT privilege for each table
    The exact privilege is checked in mysql_multi_update()
  */
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VIEW  
bell@sanja.is.com.ua committed
6874
  for (table= tables; table; table= table->next_local)
6875
  {
6876 6877 6878
    if (table->derived)
      table->grant.privilege= SELECT_ACL;
    else if ((check_access(thd, UPDATE_ACL, table->db,
Marc Alff's avatar
Marc Alff committed
6879 6880 6881
                           &table->grant.privilege,
                           &table->grant.m_internal,
                           0, 1) ||
6882
              check_grant(thd, UPDATE_ACL, table, FALSE, 1, TRUE)) &&
monty@mysql.com's avatar
monty@mysql.com committed
6883
             (check_access(thd, SELECT_ACL, table->db,
Marc Alff's avatar
Marc Alff committed
6884 6885 6886
                           &table->grant.privilege,
                           &table->grant.m_internal,
                           0, 0) ||
6887
              check_grant(thd, SELECT_ACL, table, FALSE, 1, FALSE)))
6888
      DBUG_RETURN(TRUE);
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bell@sanja.is.com.ua committed
6889

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
6890
    table->table_in_first_from_clause= 1;
6891
  }
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6892 6893 6894
  /*
    Is there tables of subqueries?
  */
6895
  if (&lex->select_lex != lex->all_selects_list)
6896
  {
6897
    DBUG_PRINT("info",("Checking sub query list"));
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VIEW  
bell@sanja.is.com.ua committed
6898
    for (table= tables; table; table= table->next_global)
6899
    {
6900
      if (!table->table_in_first_from_clause)
6901 6902
      {
	if (check_access(thd, SELECT_ACL, table->db,
Marc Alff's avatar
Marc Alff committed
6903 6904 6905
                         &table->grant.privilege,
                         &table->grant.m_internal,
                         0, 0) ||
6906
	    check_grant(thd, SELECT_ACL, table, FALSE, 1, FALSE))
6907
	  DBUG_RETURN(TRUE);
6908 6909 6910 6911 6912 6913
      }
    }
  }

  if (select_lex->order_list.elements)
    msg= "ORDER BY";
6914
  else if (select_lex->select_limit)
6915 6916 6917 6918
    msg= "LIMIT";
  if (msg)
  {
    my_error(ER_WRONG_USAGE, MYF(0), "UPDATE", msg);
6919
    DBUG_RETURN(TRUE);
6920
  }
6921
  DBUG_RETURN(FALSE);
6922 6923
}

6924 6925
/**
  Multi delete query pre-check.
6926

6927 6928
  @param thd			Thread handler
  @param tables		Global/local table list
6929

6930
  @retval
6931
    FALSE OK
6932
  @retval
6933
    TRUE  error
6934
*/
6935

6936
bool multi_delete_precheck(THD *thd, TABLE_LIST *tables)
6937 6938 6939
{
  SELECT_LEX *select_lex= &thd->lex->select_lex;
  TABLE_LIST *aux_tables=
6940
    (TABLE_LIST *)thd->lex->auxiliary_table_list.first;
6941
  TABLE_LIST **save_query_tables_own_last= thd->lex->query_tables_own_last;
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VIEW  
bell@sanja.is.com.ua committed
6942
  DBUG_ENTER("multi_delete_precheck");
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bell@sanja.is.com.ua committed
6943

6944 6945
  /* sql_yacc guarantees that tables and aux_tables are not zero */
  DBUG_ASSERT(aux_tables != 0);
6946
  if (check_table_access(thd, SELECT_ACL, tables, FALSE, UINT_MAX, FALSE))
6947 6948 6949 6950 6951 6952 6953 6954
    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;
6955
  if (check_table_access(thd, DELETE_ACL, aux_tables, FALSE, UINT_MAX, FALSE))
6956 6957
  {
    thd->lex->query_tables_own_last= save_query_tables_own_last;
6958
    DBUG_RETURN(TRUE);
6959 6960 6961
  }
  thd->lex->query_tables_own_last= save_query_tables_own_last;

6962
  if ((thd->variables.option_bits & OPTION_SAFE_UPDATES) && !select_lex->where)
6963
  {
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bell@sanja.is.com.ua committed
6964 6965
    my_message(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE,
               ER(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE), MYF(0));
6966
    DBUG_RETURN(TRUE);
6967
  }
6968 6969 6970 6971
  DBUG_RETURN(FALSE);
}


6972 6973 6974 6975 6976 6977 6978 6979 6980 6981 6982 6983 6984 6985 6986 6987 6988 6989 6990 6991 6992 6993 6994 6995 6996 6997 6998 6999 7000 7001 7002 7003 7004 7005 7006 7007 7008 7009 7010 7011 7012 7013 7014 7015 7016 7017 7018 7019 7020 7021 7022 7023 7024 7025 7026 7027 7028
/*
  Given a table in the source list, find a correspondent table in the
  table references list.

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

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

  @return Matching table, NULL otherwise.
*/

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

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

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

    if (cmp)
      continue;

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

    match= elem;
  }

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

  DBUG_RETURN(match);
}


7029
/**
7030 7031 7032
  Link tables in auxilary table list of multi-delete with corresponding
  elements in main table list, and set proper locks for them.

7033
  @param lex   pointer to LEX representing multi-delete
7034

7035 7036 7037 7038
  @retval
    FALSE   success
  @retval
    TRUE    error
7039 7040 7041 7042 7043 7044 7045 7046 7047 7048
*/

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;

7049
  for (target_tbl= (TABLE_LIST *)lex->auxiliary_table_list.first;
7050
       target_tbl; target_tbl= target_tbl->next_local)
7051
  {
7052
    lex->table_count++;
7053
    /* All tables in aux_tables must be found in FROM PART */
7054
    TABLE_LIST *walk= multi_delete_table_match(lex, target_tbl, tables);
7055
    if (!walk)
7056
      DBUG_RETURN(TRUE);
serg@serg.mylan's avatar
serg@serg.mylan committed
7057 7058 7059 7060 7061
    if (!walk->derived)
    {
      target_tbl->table_name= walk->table_name;
      target_tbl->table_name_length= walk->table_name_length;
    }
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serg@serg.mylan committed
7062
    walk->updating= target_tbl->updating;
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bell@sanja.is.com.ua committed
7063
    walk->lock_type= target_tbl->lock_type;
7064 7065 7066
    /* We can assume that tables to be deleted from are locked for write. */
    DBUG_ASSERT(walk->lock_type >= TL_WRITE_ALLOW_WRITE);
    walk->mdl_request.set_type(MDL_SHARED_WRITE);
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VIEW  
bell@sanja.is.com.ua committed
7067
    target_tbl->correspondent_table= walk;	// Remember corresponding table
7068
  }
7069
  DBUG_RETURN(FALSE);
7070 7071 7072
}


7073 7074
/**
  simple UPDATE query pre-check.
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bell@sanja.is.com.ua committed
7075

7076 7077
  @param thd		Thread handler
  @param tables	Global table list
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bell@sanja.is.com.ua committed
7078

7079
  @retval
7080
    FALSE OK
7081
  @retval
7082
    TRUE  Error
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bell@sanja.is.com.ua committed
7083
*/
7084

7085
bool update_precheck(THD *thd, TABLE_LIST *tables)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7086 7087 7088 7089
{
  DBUG_ENTER("update_precheck");
  if (thd->lex->select_lex.item_list.elements != thd->lex->value_list.elements)
  {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7090
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
7091
    DBUG_RETURN(TRUE);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7092
  }
7093
  DBUG_RETURN(check_one_table_access(thd, UPDATE_ACL, tables));
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7094 7095 7096
}


7097 7098
/**
  simple DELETE query pre-check.
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7099

7100 7101
  @param thd		Thread handler
  @param tables	Global table list
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7102

7103
  @retval
7104
    FALSE  OK
7105
  @retval
7106
    TRUE   error
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7107
*/
7108

7109
bool delete_precheck(THD *thd, TABLE_LIST *tables)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7110 7111 7112
{
  DBUG_ENTER("delete_precheck");
  if (check_one_table_access(thd, DELETE_ACL, tables))
7113
    DBUG_RETURN(TRUE);
7114
  /* Set privilege for the WHERE clause */
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7115
  tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
7116
  DBUG_RETURN(FALSE);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7117 7118 7119
}


7120 7121
/**
  simple INSERT query pre-check.
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7122

7123 7124
  @param thd		Thread handler
  @param tables	Global table list
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7125

7126
  @retval
7127
    FALSE  OK
7128
  @retval
7129
    TRUE   error
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7130
*/
7131

bell@sanja.is.com.ua's avatar
merge  
bell@sanja.is.com.ua committed
7132
bool insert_precheck(THD *thd, TABLE_LIST *tables)
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bell@sanja.is.com.ua committed
7133 7134 7135 7136
{
  LEX *lex= thd->lex;
  DBUG_ENTER("insert_precheck");

7137 7138 7139 7140
  /*
    Check that we have modify privileges for the first table and
    select privileges for the rest
  */
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monty@mysql.com committed
7141 7142 7143
  ulong privilege= (INSERT_ACL |
                    (lex->duplicates == DUP_REPLACE ? DELETE_ACL : 0) |
                    (lex->value_list.elements ? UPDATE_ACL : 0));
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bell@sanja.is.com.ua committed
7144 7145

  if (check_one_table_access(thd, privilege, tables))
7146
    DBUG_RETURN(TRUE);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7147

7148
  if (lex->update_list.elements != lex->value_list.elements)
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bell@sanja.is.com.ua committed
7149
  {
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bell@sanja.is.com.ua committed
7150
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
7151
    DBUG_RETURN(TRUE);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7152
  }
7153
  DBUG_RETURN(FALSE);
7154
}
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7155 7156


7157 7158 7159 7160 7161 7162 7163 7164 7165 7166 7167 7168 7169 7170 7171 7172 7173 7174 7175 7176 7177 7178 7179 7180 7181 7182 7183 7184
/**
   Set proper open mode and table type for element representing target table
   of CREATE TABLE statement, also adjust statement table list if necessary.
*/

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

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

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


7185 7186
/**
  CREATE TABLE query pre-check.
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bell@sanja.is.com.ua committed
7187

7188 7189 7190
  @param thd			Thread handler
  @param tables		Global table list
  @param create_table	        Table which will be created
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7191

7192
  @retval
7193
    FALSE   OK
7194
  @retval
7195
    TRUE   Error
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7196
*/
7197

7198 7199
bool create_table_precheck(THD *thd, TABLE_LIST *tables,
                           TABLE_LIST *create_table)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7200 7201
{
  LEX *lex= thd->lex;
7202 7203
  SELECT_LEX *select_lex= &lex->select_lex;
  ulong want_priv;
bell@sanja.is.com.ua's avatar
merge  
bell@sanja.is.com.ua committed
7204
  bool error= TRUE;                                 // Error message is given
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7205
  DBUG_ENTER("create_table_precheck");
7206

7207 7208 7209 7210 7211
  /*
    Require CREATE [TEMPORARY] privilege on new table; for
    CREATE TABLE ... SELECT, also require INSERT.
  */

7212
  want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
7213 7214 7215
              CREATE_TMP_ACL : CREATE_ACL) |
             (select_lex->item_list.elements ? INSERT_ACL : 0);

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7216
  if (check_access(thd, want_priv, create_table->db,
Marc Alff's avatar
Marc Alff committed
7217 7218 7219
                   &create_table->grant.privilege,
                   &create_table->grant.m_internal,
                   0, 0) ||
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bell@sanja.is.com.ua committed
7220 7221 7222
      check_merge_table_access(thd, create_table->db,
			       (TABLE_LIST *)
			       lex->create_info.merge_list.first))
7223
    goto err;
7224
  if (want_priv != CREATE_TMP_ACL &&
7225
      check_grant(thd, want_priv, create_table, FALSE, 1, FALSE))
7226 7227 7228 7229 7230 7231
    goto err;

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

7232 7233
#ifdef NOT_NECESSARY_TO_CHECK_CREATE_TABLE_EXIST_WHEN_PREPARING_STATEMENT
    /* This code throws an ill error for CREATE TABLE t1 SELECT * FROM t1 */
7234
    /*
7235
      Only do the check for PS, because we on execute we have to check that
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7236 7237
      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).
7238
    */
konstantin@mysql.com's avatar
konstantin@mysql.com committed
7239
    if (thd->stmt_arena->is_stmt_prepare_or_first_sp_execute())
7240
    {
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monty@mysql.com committed
7241 7242 7243 7244
      /*
        For temporary tables we don't have to check if the created table exists
      */
      if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
monty@mysql.com's avatar
monty@mysql.com committed
7245
          find_table_in_global_list(tables, create_table->db,
7246
                                    create_table->table_name))
monty@mysql.com's avatar
monty@mysql.com committed
7247
      {
7248
	error= FALSE;
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monty@mysql.com committed
7249 7250 7251
        goto err;
      }
    }
7252
#endif
7253 7254
    if (tables && check_table_access(thd, SELECT_ACL, tables, FALSE,
                                     UINT_MAX, FALSE))
7255 7256
      goto err;
  }
7257 7258
  else if (lex->create_info.options & HA_LEX_CREATE_TABLE_LIKE)
  {
7259
    if (check_table_access(thd, SELECT_ACL, tables, FALSE, UINT_MAX, FALSE))
7260 7261
      goto err;
  }
bell@sanja.is.com.ua's avatar
merge  
bell@sanja.is.com.ua committed
7262
  error= FALSE;
7263 7264 7265

err:
  DBUG_RETURN(error);
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bell@sanja.is.com.ua committed
7266
}
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7267 7268


7269 7270
/**
  negate given expression.
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7271

7272 7273
  @param thd  thread handler
  @param expr expression for negation
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bell@sanja.is.com.ua committed
7274

7275
  @return
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7276 7277 7278 7279 7280 7281 7282 7283 7284 7285 7286 7287 7288 7289 7290 7291 7292 7293 7294 7295 7296 7297 7298 7299 7300
    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);
}
7301

7302 7303 7304
/**
  Set the specified definer to the default value, which is the
  current user in the thread.
7305
 
7306 7307
  @param[in]  thd       thread handler
  @param[out] definer   definer
7308 7309
*/
 
7310
void get_default_definer(THD *thd, LEX_USER *definer)
7311 7312 7313 7314 7315 7316 7317 7318
{
  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);
7319 7320 7321

  definer->password.str= NULL;
  definer->password.length= 0;
7322 7323
}

7324

7325
/**
7326
  Create default definer for the specified THD.
7327

7328
  @param[in] thd         thread handler
7329

7330 7331
  @return
    - On success, return a valid pointer to the created and initialized
7332
    LEX_USER, which contains definer information.
7333
    - On error, return 0.
7334 7335 7336 7337 7338 7339 7340 7341 7342
*/

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

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

7343
  get_default_definer(thd, definer);
7344 7345 7346 7347 7348

  return definer;
}


7349
/**
7350
  Create definer with the given user and host names.
7351

7352 7353 7354
  @param[in] thd          thread handler
  @param[in] user_name    user name
  @param[in] host_name    host name
7355

7356 7357
  @return
    - On success, return a valid pointer to the created and initialized
7358
    LEX_USER, which contains definer information.
7359
    - On error, return 0.
7360 7361
*/

7362
LEX_USER *create_definer(THD *thd, LEX_STRING *user_name, LEX_STRING *host_name)
7363
{
7364 7365 7366 7367
  LEX_USER *definer;

  /* Create and initialize. */

7368
  if (! (definer= (LEX_USER*) thd->alloc(sizeof(LEX_USER))))
7369 7370 7371 7372
    return 0;

  definer->user= *user_name;
  definer->host= *host_name;
7373 7374
  definer->password.str= NULL;
  definer->password.length= 0;
7375 7376

  return definer;
7377
}
7378 7379


7380
/**
7381 7382
  Retuns information about user or current user.

7383 7384
  @param[in] thd          thread handler
  @param[in] user         user
7385

7386 7387
  @return
    - On success, return a valid pointer to initialized
7388
    LEX_USER, which contains user information.
7389
    - On error, return 0.
7390 7391 7392 7393 7394
*/

LEX_USER *get_current_user(THD *thd, LEX_USER *user)
{
  if (!user->user.str)  // current_user
7395 7396
    return create_default_definer(thd);

7397 7398
  return user;
}
7399 7400


7401
/**
7402
  Check that byte length of a string does not exceed some limit.
7403

7404 7405 7406
  @param str         string to be checked
  @param err_msg     error message to be displayed if the string is too long
  @param max_length  max length
7407

7408
  @retval
7409
    FALSE   the passed string is not longer than max_length
7410
  @retval
7411
    TRUE    the passed string is longer than max_length
7412 7413 7414

  NOTE
    The function is not used in existing code but can be useful later?
7415 7416
*/

7417 7418
bool check_string_byte_length(LEX_STRING *str, const char *err_msg,
                              uint max_byte_length)
7419
{
7420
  if (str->length <= max_byte_length)
7421
    return FALSE;
7422

7423 7424 7425 7426 7427 7428 7429 7430 7431 7432 7433 7434 7435 7436 7437 7438 7439 7440 7441 7442 7443 7444 7445 7446 7447 7448 7449 7450 7451 7452 7453 7454
  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;
7455

7456
  if (!no_error)
7457 7458 7459 7460
  {
    ErrConvString err(str->str, str->length, cs);
    my_error(ER_WRONG_STRING_LENGTH, MYF(0), err.ptr(), err_msg, max_char_length);
  }
7461 7462
  return TRUE;
}
7463 7464


7465 7466 7467 7468 7469 7470 7471 7472 7473 7474 7475 7476
/*
  Check if path does not contain mysql data home directory
  SYNOPSIS
    test_if_data_home_dir()
    dir                     directory
    conv_home_dir           converted data home directory
    home_dir_len            converted data home directory length

  RETURN VALUES
    0	ok
    1	error  
*/
7477
C_MODE_START
7478

7479
int test_if_data_home_dir(const char *dir)
7480
{
7481
  char path[FN_REFLEN];
Alexey Botchkov's avatar
Alexey Botchkov committed
7482
  int dir_len;
7483 7484 7485 7486 7487 7488 7489
  DBUG_ENTER("test_if_data_home_dir");

  if (!dir)
    DBUG_RETURN(0);

  (void) fn_format(path, dir, "", "",
                   (MY_RETURN_REAL_PATH|MY_RESOLVE_SYMLINKS));
7490 7491
  dir_len= strlen(path);
  if (mysql_unpacked_real_data_home_len<= dir_len)
7492
  {
7493 7494 7495 7496
    if (dir_len > mysql_unpacked_real_data_home_len &&
        path[mysql_unpacked_real_data_home_len] != FN_LIBCHAR)
      DBUG_RETURN(0);

7497 7498
    if (lower_case_file_system)
    {
7499 7500
      if (!my_strnncoll(default_charset_info, (const uchar*) path,
                        mysql_unpacked_real_data_home_len,
7501
                        (const uchar*) mysql_unpacked_real_data_home,
7502
                        mysql_unpacked_real_data_home_len))
7503 7504
        DBUG_RETURN(1);
    }
7505 7506
    else if (!memcmp(path, mysql_unpacked_real_data_home,
                     mysql_unpacked_real_data_home_len))
7507 7508 7509 7510 7511
      DBUG_RETURN(1);
  }
  DBUG_RETURN(0);
}

7512 7513
C_MODE_END

7514

7515 7516 7517 7518 7519 7520 7521 7522 7523 7524 7525 7526 7527 7528 7529
/**
  Check that host name string is valid.

  @param[in] str string to be checked

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

bool check_host_name(LEX_STRING *str)
{
  const char *name= str->str;
  const char *end= str->str + str->length;
Sergey Glukhov's avatar
Sergey Glukhov committed
7530
  if (check_string_byte_length(str, ER(ER_HOSTNAME), HOSTNAME_LENGTH))
7531 7532 7533 7534 7535 7536 7537 7538 7539 7540 7541 7542 7543 7544 7545
    return TRUE;

  while (name != end)
  {
    if (*name == '@')
    {
      my_printf_error(ER_UNKNOWN_ERROR, 
                      "Malformed hostname (illegal symbol: '%c')", MYF(0),
                      *name);
      return TRUE;
    }
    name++;
  }
  return FALSE;
}
Sergey Glukhov's avatar
Sergey Glukhov committed
7546 7547


7548 7549 7550 7551 7552 7553 7554 7555
extern int MYSQLparse(void *thd); // from sql_yacc.cc


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

  @param thd Thread context.
7556
  @param parser_state Parser state.
7557
  @param creation_ctx Object creation context.
7558 7559 7560 7561 7562 7563

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

7564
bool parse_sql(THD *thd,
7565
               Parser_state *parser_state,
7566
               Object_creation_ctx *creation_ctx)
7567
{
7568
  bool ret_value;
7569
  DBUG_ASSERT(thd->m_parser_state == NULL);
7570

7571
  MYSQL_QUERY_PARSE_START(thd->query());
7572 7573 7574 7575 7576 7577 7578
  /* Backup creation context. */

  Object_creation_ctx *backup_ctx= NULL;

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

7579
  /* Set parser state. */
7580

7581
  thd->m_parser_state= parser_state;
7582

7583 7584
  /* Parse the query. */

7585 7586
  bool mysql_parse_status= MYSQLparse(thd) != 0;

7587
  /* Check that if MYSQLparse() failed, thd->is_error() is set. */
7588 7589

  DBUG_ASSERT(!mysql_parse_status ||
Staale Smedseng's avatar
Staale Smedseng committed
7590
              (mysql_parse_status && thd->is_error()));
7591

7592
  /* Reset parser state. */
7593

7594
  thd->m_parser_state= NULL;
7595

7596 7597 7598 7599 7600 7601 7602
  /* Restore creation context. */

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

  /* That's it. */

7603 7604 7605
  ret_value= mysql_parse_status || thd->is_fatal_error;
  MYSQL_QUERY_PARSE_DONE(ret_value);
  return ret_value;
7606
}
7607 7608 7609 7610

/**
  @} (end of group Runtime_Environment)
*/
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#  
Alexander Barkov committed
7611 7612 7613 7614 7615 7616 7617 7618 7619 7620 7621 7622 7623 7624 7625 7626 7627 7628 7629 7630 7631 7632 7633 7634 7635 7636 7637 7638 7639 7640 7641 7642 7643 7644



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

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

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

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


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