sql_parse.cc 136 KB
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/* Copyright (C) 2000-2003 MySQL AB
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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

#include "mysql_priv.h"
#include "sql_acl.h"
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#include "sql_repl.h"
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#include "repl_failsafe.h"
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#include <m_ctype.h>
#include <myisam.h>
#include <my_dir.h>

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

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#ifdef HAVE_OPENSSL
/*
  Without SSL the handshake consists of one packet. This packet
  has both client capabilites and scrambled password.
  With SSL the handshake might consist of two packets. If the first
  packet (client capabilities) has CLIENT_SSL flag set, we have to
  switch to SSL and read the second packet. The scrambled password
  is in the second packet and client_capabilites field will be ignored.
  Maybe it is better to accept flags other than CLIENT_SSL from the
  second packet?
*/
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#define SSL_HANDSHAKE_SIZE      2
#define NORMAL_HANDSHAKE_SIZE   6
#define MIN_HANDSHAKE_SIZE      2
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#else
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#define MIN_HANDSHAKE_SIZE      6
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#endif /* HAVE_OPENSSL */
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#ifdef SOLARIS
extern "C" int gethostname(char *name, int namelen);
#endif
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static int check_for_max_user_connections(THD *thd, USER_CONN *uc);
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static void decrease_user_connections(USER_CONN *uc);
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static bool check_db_used(THD *thd,TABLE_LIST *tables);
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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static bool check_merge_table_access(THD *thd, char *db, TABLE_LIST *tables);
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static bool single_table_command_access(THD *thd, ulong privilege,
					TABLE_LIST *tables, int *res);
#else
#define check_merge_table_access(thd, db, tables) false
#define single_table_command_access(thd, privilege, tables, res) false
#endif
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static void remove_escape(char *name);
static void refresh_status(void);
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static bool append_file_to_dir(THD *thd, char **filename_ptr,
			       char *table_name);
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const char *any_db="*any*";	// Special symbol for check_access
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const char *command_name[]={
  "Sleep", "Quit", "Init DB", "Query", "Field List", "Create DB",
  "Drop DB", "Refresh", "Shutdown", "Statistics", "Processlist",
  "Connect","Kill","Debug","Ping","Time","Delayed_insert","Change user",
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  "Binlog Dump","Table Dump",  "Connect Out", "Register Slave",
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  "Prepare", "Prepare Execute", "Long Data", "Close stmt",
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  "Error"					// Last command number
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};

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static char empty_c_string[1]= {0};		// Used for not defined 'db'
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#ifdef __WIN__
static void  test_signal(int sig_ptr)
{
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#if !defined( DBUG_OFF)
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  MessageBox(NULL,"Test signal","DBUG",MB_OK);
#endif
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#if defined(OS2)
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  fprintf(stderr, "Test signal %d\n", sig_ptr);
  fflush(stderr);
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#endif
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}
static void init_signals(void)
{
  int signals[7] = {SIGINT,SIGILL,SIGFPE,SIGSEGV,SIGTERM,SIGBREAK,SIGABRT } ;
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  for (int i=0 ; i < 7 ; i++)
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    signal( signals[i], test_signal) ;
}
#endif

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

static bool end_active_trans(THD *thd)
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{
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  int error=0;
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  if (thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN |
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		      OPTION_TABLE_LOCK))
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  {
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    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
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    if (ha_commit(thd))
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      error=1;
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  }
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  return error;
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}


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static HASH hash_user_connections;

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static int get_or_create_user_conn(THD *thd, const char *user,
				   const char *host,
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				   USER_RESOURCES *mqh)
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{
  int return_val=0;
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  uint temp_len, user_len;
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  char temp_user[USERNAME_LENGTH+HOSTNAME_LENGTH+2];
  struct  user_conn *uc;

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

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  user_len=strlen(user);
  temp_len= (strmov(strmov(temp_user, user)+1, host) - temp_user)+1;
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  (void) pthread_mutex_lock(&LOCK_user_conn);
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  if (!(uc = (struct  user_conn *) hash_search(&hash_user_connections,
					       (byte*) temp_user, temp_len)))
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  {
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    /* First connection for user; Create a user connection object */
    if (!(uc= ((struct user_conn*)
	       my_malloc(sizeof(struct user_conn) + temp_len+1,
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			 MYF(MY_WME)))))
    {
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      send_error(thd, 0, NullS);		// Out of memory
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      return_val=1;
      goto end;
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    }
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    uc->user=(char*) (uc+1);
    memcpy(uc->user,temp_user,temp_len+1);
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    uc->user_len= user_len;
    uc->host=uc->user + uc->user_len +  1;
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    uc->len = temp_len;
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    uc->connections = 1;
    uc->questions=uc->updates=uc->conn_per_hour=0;
    uc->user_resources=*mqh;
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    if (max_user_connections && mqh->connections > max_user_connections)
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      uc->user_resources.connections = max_user_connections;
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    uc->intime=thd->thr_create_time;
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    if (my_hash_insert(&hash_user_connections, (byte*) uc))
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    {
      my_free((char*) uc,0);
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      send_error(thd, 0, NullS);		// Out of memory
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      return_val=1;
      goto end;
    }
  }
  thd->user_connect=uc;
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  uc->connections++;
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end:
  (void) pthread_mutex_unlock(&LOCK_user_conn);
  return return_val;
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}
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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/*
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    Check if user exist and password supplied is correct. 
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  SYNOPSIS
    check_user()
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    thd          thread handle, thd->{host,user,ip} are used
    command      originator of the check: now check_user is called
                 during connect and change user procedures; used for 
                 logging.
    passwd       scrambled password recieved from client
    passwd_len   length of scrambled password
    db           database name to connect to, may be NULL
    check_count  dont know exactly

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

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

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int check_user(THD *thd, enum enum_server_command command, 
	       const char *passwd, uint passwd_len, const char *db,
	       bool check_count)
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{
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  DBUG_ENTER("check_user");
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  my_bool opt_secure_auth_local;
  pthread_mutex_lock(&LOCK_global_system_variables);
  opt_secure_auth_local= opt_secure_auth;
  pthread_mutex_unlock(&LOCK_global_system_variables);
  
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  /*
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    If the server is running in secure auth mode, short scrambles are 
    forbidden.
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  */
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  if (opt_secure_auth_local && passwd_len == SCRAMBLE_LENGTH_323)
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  {
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    net_printf(thd, ER_NOT_SUPPORTED_AUTH_MODE);
    mysql_log.write(thd, COM_CONNECT, ER(ER_NOT_SUPPORTED_AUTH_MODE));
    DBUG_RETURN(-1);
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  }
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  if (passwd_len != 0 &&
      passwd_len != SCRAMBLE_LENGTH &&
      passwd_len != SCRAMBLE_LENGTH_323)
    DBUG_RETURN(ER_HANDSHAKE_ERROR);
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  /*
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    Clear thd->db as it points to something, that will be freed when 
    connection is closed. We don't want to accidently free a wrong pointer
    if connect failed. Also in case of 'CHANGE USER' failure, current
    database will be switched to 'no database selected'.
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  */
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  thd->db= 0;
  thd->db_length= 0;
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  USER_RESOURCES ur;
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  int res= acl_getroot(thd, &ur, passwd, passwd_len);
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#ifndef EMBEDDED_LIBRARY
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  if (res == -1)
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  {
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    /*
      This happens when client (new) sends password scrambled with
      scramble(), but database holds old value (scrambled with
      scramble_323()). Here we please client to send scrambled_password
      in old format.
    */
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    NET *net= &thd->net;
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    if (opt_secure_auth_local)
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    {
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      net_printf(thd, ER_SERVER_IS_IN_SECURE_AUTH_MODE,
                 thd->user, thd->host_or_ip);
      mysql_log.write(thd, COM_CONNECT, ER(ER_SERVER_IS_IN_SECURE_AUTH_MODE),
                      thd->user, thd->host_or_ip);
      DBUG_RETURN(-1);
    }
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    if (send_old_password_request(thd) ||
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        my_net_read(net) != SCRAMBLE_LENGTH_323 + 1) // We have to read very
    {                                                // specific packet size
      inc_host_errors(&thd->remote.sin_addr);
      DBUG_RETURN(ER_HANDSHAKE_ERROR);
    }
    /* Final attempt to check the user based on reply */
    /* So as passwd is short, errcode is always >= 0 */
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    res= acl_getroot(thd, &ur, (char *) net->read_pos, SCRAMBLE_LENGTH_323);
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  }
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#endif /*EMBEDDED_LIBRARY*/
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  /* here res is always >= 0 */
  if (res == 0)
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  {
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    if (!(thd->master_access & NO_ACCESS)) // authentification is OK 
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    {
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      DBUG_PRINT("info",
                 ("Capabilities: %d  packet_length: %ld  Host: '%s'  "
                  "Login user: '%s' Priv_user: '%s'  Using password: %s "
                  "Access: %u  db: '%s'",
                  thd->client_capabilities, thd->max_client_packet_length,
                  thd->host_or_ip, thd->user, thd->priv_user,
                  passwd_len ? "yes": "no",
                  thd->master_access, thd->db ? thd->db : "*none*"));

      if (check_count)
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      {
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        VOID(pthread_mutex_lock(&LOCK_thread_count));
        bool count_ok= thread_count < max_connections + delayed_insert_threads
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                       || (thd->master_access & SUPER_ACL);
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        VOID(pthread_mutex_unlock(&LOCK_thread_count));
        if (!count_ok)
        {                                         // too many connections 
          send_error(thd, ER_CON_COUNT_ERROR);
          DBUG_RETURN(-1);
        }
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      }
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      /* Why logging is performed before all checks've passed? */
      mysql_log.write(thd,command,
                      (thd->priv_user == thd->user ?
                       (char*) "%s@%s on %s" :
                       (char*) "%s@%s as anonymous on %s"),
                      thd->user, thd->host_or_ip,
                      db ? db : (char*) "");

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      /*
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        This is the default access rights for the current database.  It's
        set to 0 here because we don't have an active database yet (and we
        may not have an active database to set.
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      */
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      thd->db_access=0;

      /* Don't allow user to connect if he has done too many queries */
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      if ((ur.questions || ur.updates || ur.connections ||
	   max_user_connections) &&
	  get_or_create_user_conn(thd,thd->user,thd->host_or_ip,&ur))
	DBUG_RETURN(-1);
      if (thd->user_connect &&
	  (thd->user_connect->user_resources.connections ||
	   max_user_connections) &&
	  check_for_max_user_connections(thd, thd->user_connect))
	DBUG_RETURN(-1);
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      /* Change database if necessary: OK or FAIL is sent in mysql_change_db */
      if (db && db[0])
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      {
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        if (mysql_change_db(thd, db))
        {
          if (thd->user_connect)
            decrease_user_connections(thd->user_connect);
          DBUG_RETURN(-1);
        }
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      }
      else
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        send_ok(thd);
      thd->password= test(passwd_len);          // remember for error messages 
      /* Ready to handle queries */
      DBUG_RETURN(0);
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    }
  }
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  else if (res == 2) // client gave short hash, server has long hash
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  {
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    net_printf(thd, ER_NOT_SUPPORTED_AUTH_MODE);
    mysql_log.write(thd,COM_CONNECT,ER(ER_NOT_SUPPORTED_AUTH_MODE));
    DBUG_RETURN(-1);
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  }
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  net_printf(thd, ER_ACCESS_DENIED_ERROR,
             thd->user,
             thd->host_or_ip,
             passwd_len ? ER(ER_YES) : ER(ER_NO));
  mysql_log.write(thd, COM_CONNECT, ER(ER_ACCESS_DENIED_ERROR),
                  thd->user,
                  thd->host_or_ip,
                  passwd_len ? ER(ER_YES) : ER(ER_NO));
  DBUG_RETURN(-1);
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}

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

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

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

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


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

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

  RETURN
    0	ok
    1	error
*/

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


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/*
  Decrease user connection count

  SYNOPSIS
    decrease_user_connections()
    uc			User connection object

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

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

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

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

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/*
  Mark all commands that somehow changes a table
  This is used to check number of updates / hour
*/

char  uc_update_queries[SQLCOM_END];

void init_update_queries(void)
{
  uc_update_queries[SQLCOM_CREATE_TABLE]=1;
  uc_update_queries[SQLCOM_CREATE_INDEX]=1;
  uc_update_queries[SQLCOM_ALTER_TABLE]=1;
  uc_update_queries[SQLCOM_UPDATE]=1;
  uc_update_queries[SQLCOM_INSERT]=1;
  uc_update_queries[SQLCOM_INSERT_SELECT]=1;
  uc_update_queries[SQLCOM_DELETE]=1;
  uc_update_queries[SQLCOM_TRUNCATE]=1;
  uc_update_queries[SQLCOM_DROP_TABLE]=1;
  uc_update_queries[SQLCOM_LOAD]=1;
  uc_update_queries[SQLCOM_CREATE_DB]=1;
  uc_update_queries[SQLCOM_DROP_DB]=1;
  uc_update_queries[SQLCOM_REPLACE]=1;
  uc_update_queries[SQLCOM_REPLACE_SELECT]=1;
  uc_update_queries[SQLCOM_RENAME_TABLE]=1;
  uc_update_queries[SQLCOM_BACKUP_TABLE]=1;
  uc_update_queries[SQLCOM_RESTORE_TABLE]=1;
  uc_update_queries[SQLCOM_DELETE_MULTI]=1;
  uc_update_queries[SQLCOM_DROP_INDEX]=1;
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  uc_update_queries[SQLCOM_UPDATE_MULTI]=1;
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}

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bool is_update_query(enum enum_sql_command command)
{
  return uc_update_queries[command];
}
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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/*
  Check if maximum queries per hour limit has been reached
  returns 0 if OK.
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  In theory we would need a mutex in the USER_CONN structure for this to
  be 100 % safe, but as the worst scenario is that we would miss counting
  a couple of queries, this isn't critical.
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*/

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static bool check_mqh(THD *thd, uint check_command)
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{
  bool error=0;
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  time_t check_time = thd->start_time ?  thd->start_time : time(NULL);
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  USER_CONN *uc=thd->user_connect;
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  DBUG_ENTER("check_mqh");
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  DBUG_ASSERT(uc != 0);
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  /* If more than a hour since last check, reset resource checking */
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  if (check_time  - uc->intime >= 3600)
  {
    (void) pthread_mutex_lock(&LOCK_user_conn);
    uc->questions=1;
    uc->updates=0;
    uc->conn_per_hour=0;
    uc->intime=check_time;
    (void) pthread_mutex_unlock(&LOCK_user_conn);
  }
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  /* Check that we have not done too many questions / hour */
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  if (uc->user_resources.questions &&
      uc->questions++ >= uc->user_resources.questions)
  {
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    net_printf(thd, ER_USER_LIMIT_REACHED, uc->user, "max_questions",
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	       (long) uc->user_resources.questions);
    error=1;
    goto end;
  }
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  if (check_command < (uint) SQLCOM_END)
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  {
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    /* Check that we have not done too many updates / hour */
    if (uc->user_resources.updates && uc_update_queries[check_command] &&
	uc->updates++ >= uc->user_resources.updates)
    {
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      net_printf(thd, ER_USER_LIMIT_REACHED, uc->user, "max_updates",
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		 (long) uc->user_resources.updates);
      error=1;
      goto end;
    }
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  }
end:
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  DBUG_RETURN(error);
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}

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static void reset_mqh(THD *thd, LEX_USER *lu, bool get_them= 0)
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{

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  (void) pthread_mutex_lock(&LOCK_user_conn);
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  if (lu)  // for GRANT
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  {
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    USER_CONN *uc;
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    uint temp_len=lu->user.length+lu->host.length+2;
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    char temp_user[USERNAME_LENGTH+HOSTNAME_LENGTH+2];

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    memcpy(temp_user,lu->user.str,lu->user.length);
    memcpy(temp_user+lu->user.length+1,lu->host.str,lu->host.length);
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    temp_user[lu->user.length]='\0'; temp_user[temp_len-1]=0;
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    if ((uc = (struct  user_conn *) hash_search(&hash_user_connections,
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						(byte*) temp_user, temp_len)))
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    {
      uc->questions=0;
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      get_mqh(temp_user,&temp_user[lu->user.length+1],uc);
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      uc->updates=0;
      uc->conn_per_hour=0;
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    }
  }
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  else // for FLUSH PRIVILEGES and FLUSH USER_RESOURCES
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  {
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    for (uint idx=0;idx < hash_user_connections.records; idx++)
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    {
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      USER_CONN *uc=(struct user_conn *) hash_element(&hash_user_connections, idx);
      if (get_them)
	get_mqh(uc->user,uc->host,uc);
      uc->questions=0;
      uc->updates=0;
      uc->conn_per_hour=0;
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    }
  }
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  (void) pthread_mutex_unlock(&LOCK_user_conn);
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}
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#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/
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/*
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    Perform handshake, authorize client and update thd ACL variables.
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  SYNOPSIS
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    check_connection()
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    thd  thread handle
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  RETURN
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     0  success, OK is sent to user, thd is updated.
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    -1  error, which is sent to user
   > 0  error code (not sent to user)
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*/

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#ifndef EMBEDDED_LIBRARY
static int check_connection(THD *thd)
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{
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  uint connect_errors= 0;
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  NET *net= &thd->net;
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  DBUG_PRINT("info",
             ("New connection received on %s", vio_description(net->vio)));

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  if (!thd->host)                           // If TCP/IP connection
  {
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    char ip[30];
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    if (vio_peer_addr(net->vio, ip, &thd->peer_port))
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      return (ER_BAD_HOST_ERROR);
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    if (!(thd->ip= my_strdup(ip,MYF(0))))
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      return (ER_OUT_OF_RESOURCES);
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    thd->host_or_ip= thd->ip;
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#if !defined(HAVE_SYS_UN_H) || defined(HAVE_mit_thread)
    /* Fast local hostname resolve for Win32 */
    if (!strcmp(thd->ip,"127.0.0.1"))
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    {
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      thd->host= (char*) my_localhost;
      thd->host_or_ip= my_localhost;
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    }
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    else
#endif
    {
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      if (!(specialflag & SPECIAL_NO_RESOLVE))
      {
	vio_in_addr(net->vio,&thd->remote.sin_addr);
	thd->host=ip_to_hostname(&thd->remote.sin_addr,&connect_errors);
	/* Cut very long hostnames to avoid possible overflows */
	if (thd->host)
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	{
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	  thd->host[min(strlen(thd->host), HOSTNAME_LENGTH)]= 0;
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	  thd->host_or_ip= thd->host;
	}
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	if (connect_errors > max_connect_errors)
	  return(ER_HOST_IS_BLOCKED);
      }
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    }
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    DBUG_PRINT("info",("Host: %s  ip: %s",
		       thd->host ? thd->host : "unknown host",
		       thd->ip ? thd->ip : "unknown ip"));
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    if (acl_check_host(thd->host,thd->ip))
      return(ER_HOST_NOT_PRIVILEGED);
  }
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  else /* Hostname given means that the connection was on a socket */
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  {
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    DBUG_PRINT("info",("Host: %s",thd->host));
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    thd->host_or_ip= thd->host;
    thd->ip= 0;
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    bzero((char*) &thd->remote, sizeof(struct sockaddr));
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  }
  vio_keepalive(net->vio, TRUE);
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  ulong pkt_len= 0;
  char *end;
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  {
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    /* buff[] needs to big enough to hold the server_version variable */
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    char buff[SERVER_VERSION_LENGTH + SCRAMBLE_LENGTH + 64];
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    ulong client_flags = (CLIENT_LONG_FLAG | CLIENT_CONNECT_WITH_DB |
			  CLIENT_PROTOCOL_41 | CLIENT_SECURE_CONNECTION);
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    if (opt_using_transactions)
      client_flags|=CLIENT_TRANSACTIONS;
#ifdef HAVE_COMPRESS
    client_flags |= CLIENT_COMPRESS;
#endif /* HAVE_COMPRESS */
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#ifdef HAVE_OPENSSL
    if (ssl_acceptor_fd)
      client_flags |= CLIENT_SSL;       /* Wow, SSL is avalaible! */
#endif /* HAVE_OPENSSL */
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    end= strnmov(buff, server_version, SERVER_VERSION_LENGTH) + 1;
    int4store((uchar*) end, thd->thread_id);
    end+= 4;
    /*
      So as check_connection is the only entry point to authorization
      procedure, scramble is set here. This gives us new scramble for
      each handshake.
    */
    create_random_string(thd->scramble, SCRAMBLE_LENGTH, &thd->rand);
    /*
      Old clients does not understand long scrambles, but can ignore packet
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      tail: that's why first part of the scramble is placed here, and second
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      part at the end of packet.
    */
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    end= strmake(end, thd->scramble, SCRAMBLE_LENGTH_323) + 1;
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    int2store(end, client_flags);
    /* write server characteristics: up to 16 bytes allowed */
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    end[2]=(char) default_charset_info->number;
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    int2store(end+3, thd->server_status);
    bzero(end+5, 13);
    end+= 18;
    /* write scramble tail */
    end= strmake(end, thd->scramble + SCRAMBLE_LENGTH_323, 
                 SCRAMBLE_LENGTH - SCRAMBLE_LENGTH_323) + 1;

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

  thd->client_capabilities=uint2korr(net->read_pos);
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#ifdef TO_BE_REMOVED_IN_4_1_RELEASE
  /*
    This is just a safety check against any client that would use the old
    CLIENT_CHANGE_USER flag
  */
  if ((thd->client_capabilities & CLIENT_PROTOCOL_41) &&
      !(thd->client_capabilities & (CLIENT_RESERVED |
				    CLIENT_SECURE_CONNECTION |
				    CLIENT_MULTI_RESULTS)))
    thd->client_capabilities&= ~CLIENT_PROTOCOL_41;
#endif
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  if (thd->client_capabilities & CLIENT_PROTOCOL_41)
  {
    thd->client_capabilities|= ((ulong) uint2korr(net->read_pos+2)) << 16;
    thd->max_client_packet_length= uint4korr(net->read_pos+4);
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    DBUG_PRINT("info", ("client_character_set: %d", (uint) net->read_pos[8]));
    /*
      Use server character set and collation if
      - client has not specified a character set
      - client character set is the same as the servers
      - client character set doesn't exists in server
    */
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    if (!(thd->variables.character_set_client=
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	  get_charset((uint) net->read_pos[8], MYF(0))) ||
	!my_strcasecmp(&my_charset_latin1,
		       global_system_variables.character_set_client->name,
		       thd->variables.character_set_client->name))
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    {
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      thd->variables.character_set_client=
	global_system_variables.character_set_client;
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      thd->variables.collation_connection=
	global_system_variables.collation_connection;
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      thd->variables.character_set_results=
	global_system_variables.character_set_results;
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    }
    else
    {
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      thd->variables.character_set_results=
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      thd->variables.collation_connection= 
	thd->variables.character_set_client;
    }
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    thd->update_charset();
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    end= (char*) net->read_pos+32;
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  }
  else
  {
    thd->max_client_packet_length= uint3korr(net->read_pos+2);
    end= (char*) net->read_pos+5;
  }

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

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

  if (thd->client_capabilities & CLIENT_INTERACTIVE)
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    thd->variables.net_wait_timeout= thd->variables.net_interactive_timeout;
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  if ((thd->client_capabilities & CLIENT_TRANSACTIONS) &&
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      opt_using_transactions)
    net->return_status= &thd->server_status;
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  net->read_timeout=(uint) thd->variables.net_read_timeout;
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  char *user= end;
  char *passwd= strend(user)+1;
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  char *db= passwd;
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  char db_buff[NAME_LEN+1];                     // buffer to store db in utf8 
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  /* 
    Old clients send null-terminated string as password; new clients send
    the size (1 byte) + string (not null-terminated). Hence in case of empty
    password both send '\0'.
  */
  uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ? 
    *passwd++ : strlen(passwd);
  db= thd->client_capabilities & CLIENT_CONNECT_WITH_DB ?
    db + passwd_len + 1 : 0;
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  /* Since 4.1 all database names are stored in utf8 */
  if (db)
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  {
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    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
                             system_charset_info,
                             db, strlen(db),
                             thd->charset())]= 0;
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    db= db_buff;
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  }
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  if (thd->user)
    x_free(thd->user);
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  if (!(thd->user= my_strdup(user, MYF(0))))
    return (ER_OUT_OF_RESOURCES);
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  return check_user(thd, COM_CONNECT, passwd, passwd_len, db, true);
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}

pthread_handler_decl(handle_one_connection,arg)
{
  THD *thd=(THD*) arg;
  uint launch_time  =
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    (uint) ((thd->thr_create_time = time(NULL)) - thd->connect_time);
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  if (launch_time >= slow_launch_time)
    statistic_increment(slow_launch_threads,&LOCK_status );

  pthread_detach_this_thread();

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#if !defined( __WIN__) && !defined(OS2)	// Win32 calls this in pthread_create
  // The following calls needs to be done before we call DBUG_ macros
875
  if (!(test_flags & TEST_NO_THREADS) & my_thread_init())
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  {
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    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
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    statistic_increment(aborted_connects,&LOCK_status);
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    end_thread(thd,0);
    return 0;
  }
#endif

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

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#if defined(__WIN__)
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  init_signals();				// IRENA; testing ?
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#elif !defined(OS2) && !defined(__NETWARE__)
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  sigset_t set;
  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
#endif
  if (thd->store_globals())
  {
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    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
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    statistic_increment(aborted_connects,&LOCK_status);
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    end_thread(thd,0);
    return 0;
  }

  do
  {
    int error;
    NET *net= &thd->net;
    thd->thread_stack= (char*) &thd;

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    if ((error=check_connection(thd)))
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    {						// Wrong permissions
      if (error > 0)
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	net_printf(thd,error,thd->host_or_ip);
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#ifdef __NT__
      if (vio_type(net->vio) == VIO_TYPE_NAMEDPIPE)
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	my_sleep(1000);				/* must wait after eof() */
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#endif
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      statistic_increment(aborted_connects,&LOCK_status);
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      goto end_thread;
    }
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#ifdef __NETWARE__
    netware_reg_user(thd->ip, thd->user, "MySQL");
#endif
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    if (thd->variables.max_join_size == HA_POS_ERROR)
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      thd->options |= OPTION_BIG_SELECTS;
    if (thd->client_capabilities & CLIENT_COMPRESS)
      net->compress=1;				// Use compression

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    thd->proc_info=0;				// Remove 'login'
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    thd->command=COM_SLEEP;
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    thd->version=refresh_version;
    thd->set_time();
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    thd->init_for_queries();
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    while (!net->error && net->vio != 0 && !thd->killed)
    {
      if (do_command(thd))
	break;
    }
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    if (thd->user_connect)
      decrease_user_connections(thd->user_connect);
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    free_root(&thd->mem_root,MYF(0));
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    if (net->error && net->vio != 0 && net->report_error)
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    {
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      if (!thd->killed && thd->variables.log_warnings)
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	sql_print_error(ER(ER_NEW_ABORTING_CONNECTION),
			thd->thread_id,(thd->db ? thd->db : "unconnected"),
			thd->user ? thd->user : "unauthenticated",
			thd->host_or_ip,
			(net->last_errno ? ER(net->last_errno) :
			 ER(ER_UNKNOWN_ERROR)));
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      send_error(thd,net->last_errno,NullS);
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      statistic_increment(aborted_threads,&LOCK_status);
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    }
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    else if (thd->killed)
    {
      statistic_increment(aborted_threads,&LOCK_status);
    }
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end_thread:
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    close_connection(thd, 0, 1);
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    end_thread(thd,1);
    /*
      If end_thread returns, we are either running with --one-thread
      or this thread has been schedule to handle the next query
    */
    thd= current_thd;
  } while (!(test_flags & TEST_NO_THREADS));
  /* The following is only executed if we are not using --one-thread */
  return(0);					/* purecov: deadcode */
}

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#endif /* EMBEDDED_LIBRARY */

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

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#ifndef EMBEDDED_LIBRARY
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  pthread_detach_this_thread();
  thd->thread_stack= (char*) &thd;
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#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__)
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  sigset_t set;
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  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
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#endif
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#endif /* EMBEDDED_LIBRARY */
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  if (thd->variables.max_join_size == HA_POS_ERROR)
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    thd->options |= OPTION_BIG_SELECTS;

  thd->proc_info=0;
  thd->version=refresh_version;
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  thd->priv_user=thd->user=(char*) my_strdup("boot", MYF(MY_WME));
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  buff= (char*) thd->net.buff;
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  thd->init_for_queries();
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  while (fgets(buff, thd->net.max_packet, file))
  {
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    uint length=(uint) strlen(buff);
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    while (length && (my_isspace(thd->charset(), buff[length-1]) ||
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           buff[length-1] == ';'))
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      length--;
    buff[length]=0;
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    thd->query_length=length;
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    thd->query= thd->memdup_w_gap(buff, length+1, thd->db_length+1);
    thd->query[length] = '\0';
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    thd->query_id=query_id++;
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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    if (mqh_used && thd->user_connect && check_mqh(thd, SQLCOM_END))
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    {
      thd->net.error = 0;
      close_thread_tables(thd);			// Free tables
      free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
      break;
    }
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#endif
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    mysql_parse(thd,thd->query,length);
    close_thread_tables(thd);			// Free tables
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    if (thd->is_fatal_error)
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      break;
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    free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
1046
    free_root(&thd->transaction.mem_root,MYF(MY_KEEP_PREALLOC));
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  }
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  /* thd->fatal_error should be set in case something went wrong */
end:
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#ifndef EMBEDDED_LIBRARY
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  (void) pthread_mutex_lock(&LOCK_thread_count);
  thread_count--;
  (void) pthread_mutex_unlock(&LOCK_thread_count);
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  (void) pthread_cond_broadcast(&COND_thread_count);
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  my_thread_end();
  pthread_exit(0);
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#endif
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  DBUG_RETURN(0);				// Never reached
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}

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    /* This works because items are allocated with sql_alloc() */
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void free_items(Item *item)
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{
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  for (; item ; item=item->next)
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    delete item;
}

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

void cleanup_items(Item *item)
{
  for (; item ; item=item->next)
    item->cleanup();
}

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int mysql_table_dump(THD* thd, char* db, char* tbl_name, int fd)
{
  TABLE* table;
  TABLE_LIST* table_list;
  int error = 0;
  DBUG_ENTER("mysql_table_dump");
  db = (db && db[0]) ? db : thd->db;
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  if (!(table_list = (TABLE_LIST*) thd->calloc(sizeof(TABLE_LIST))))
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    DBUG_RETURN(1); // out of memory
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  table_list->db = db;
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  table_list->real_name = table_list->alias = tbl_name;
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  table_list->lock_type = TL_READ_NO_INSERT;
  table_list->next = 0;

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  if (!db || check_db_name(db))
  {
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    net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
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    goto err;
  }
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  if (lower_case_table_names)
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    my_casedn_str(files_charset_info, tbl_name);
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  remove_escape(table_list->real_name);
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  if (!(table=open_ltable(thd, table_list, TL_READ_NO_INSERT)))
    DBUG_RETURN(1);

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#ifndef NO_EMBEDDED_ACCESS_CHECKS
  if (check_access(thd, SELECT_ACL, db, &table_list->grant.privilege,0,0))
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    goto err;
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  if (grant_option && check_grant(thd, SELECT_ACL, table_list))
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    goto err;
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#endif
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  thd->free_list = 0;
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  thd->query_length=(uint) strlen(tbl_name);
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  thd->query = tbl_name;
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  if ((error = mysqld_dump_create_info(thd, table, -1)))
  {
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    my_error(ER_GET_ERRNO, MYF(0), my_errno);
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    goto err;
  }
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  net_flush(&thd->net);
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  if ((error= table->file->dump(thd,fd)))
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    my_error(ER_GET_ERRNO, MYF(0));
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err:
  close_thread_tables(thd);
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  DBUG_RETURN(error);
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}


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	/* Execute one command from socket (query or simple command) */
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#ifndef EMBEDDED_LIBRARY
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bool do_command(THD *thd)
{
  char *packet;
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  uint old_timeout;
  ulong packet_length;
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  NET *net;
  enum enum_server_command command;
  DBUG_ENTER("do_command");

  net= &thd->net;
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  /*
    indicator of uninitialized lex => normal flow of errors handling
    (see my_message_sql)
  */
  thd->lex.current_select= 0;
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  packet=0;
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  old_timeout=net->read_timeout;
  // Wait max for 8 hours
  net->read_timeout=(uint) thd->variables.net_wait_timeout;
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  thd->clear_error();				// Clear error message
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  net_new_transaction(net);
  if ((packet_length=my_net_read(net)) == packet_error)
  {
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    DBUG_PRINT("info",("Got error %d reading command from socket %s",
		       net->error,
		       vio_description(net->vio)));
    /* Check if we can continue without closing the connection */
    if (net->error != 3)
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    {
      statistic_increment(aborted_threads,&LOCK_status);
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      DBUG_RETURN(TRUE);			// We have to close it.
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    }
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    send_error(thd,net->last_errno,NullS);
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    net->error= 0;
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    DBUG_RETURN(FALSE);
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  }
  else
  {
    packet=(char*) net->read_pos;
    command = (enum enum_server_command) (uchar) packet[0];
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    if (command >= COM_END)
      command= COM_END;				// Wrong command
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    DBUG_PRINT("info",("Command on %s = %d (%s)",
		       vio_description(net->vio), command,
		       command_name[command]));
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  }
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  net->read_timeout=old_timeout;		// restore it
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  DBUG_RETURN(dispatch_command(command,thd, packet+1, (uint) packet_length));
1181
}
1182
#endif  /* EMBEDDED_LIBRARY */
1183

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bool dispatch_command(enum enum_server_command command, THD *thd,
		      char* packet, uint packet_length)
{
  NET *net= &thd->net;
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  bool error= 0;
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  /*
    Commands which will always take a long time should be marked with
    this so that they will not get logged to the slow query log
  */
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  DBUG_ENTER("dispatch_command");

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  thd->command=command;
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  thd->slow_command=FALSE;
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  thd->set_time();
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  VOID(pthread_mutex_lock(&LOCK_thread_count));
  thd->query_id=query_id;
  if (command != COM_STATISTICS && command != COM_PING)
    query_id++;
  thread_running++;
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
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  thd->lex.select_lex.options=0;		// We store status here
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  switch (command) {
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  case COM_INIT_DB:
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  {
    LEX_STRING tmp;
    statistic_increment(com_stat[SQLCOM_CHANGE_DB],&LOCK_status);
    thd->convert_string(&tmp, system_charset_info,
			packet, strlen(packet), thd->charset());
    if (!mysql_change_db(thd, tmp.str))
      mysql_log.write(thd,command,"%s",thd->db);
    break;
  }
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#ifdef HAVE_REPLICATION
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  case COM_REGISTER_SLAVE:
  {
1221
    if (!register_slave(thd, (uchar*)packet, packet_length))
1222
      send_ok(thd);
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    break;
  }
1225
#endif
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  case COM_TABLE_DUMP:
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  {
    char *db, *tbl_name;
    uint db_len= *(uchar*) packet;
    uint tbl_len= *(uchar*) (packet + db_len + 1);

    statistic_increment(com_other, &LOCK_status);
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    thd->slow_command= TRUE;
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    db= thd->alloc(db_len + tbl_len + 2);
    tbl_name= strmake(db, packet + 1, db_len)+1;
    strmake(tbl_name, packet + db_len + 2, tbl_len);
    if (mysql_table_dump(thd, db, tbl_name, -1))
      send_error(thd); // dump to NET
    break;
  }
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#ifndef EMBEDDED_LIBRARY
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  case COM_CHANGE_USER:
  {
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    thd->change_user();
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    thd->clear_error();                         // if errors from rollback
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    statistic_increment(com_other, &LOCK_status);
    char *user= (char*) packet;
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    char *passwd= strend(user)+1;
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    /* 
      Old clients send null-terminated string ('\0' for empty string) for
      password.  New clients send the size (1 byte) + string (not null
      terminated, so also '\0' for empty string).
    */
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    char db_buff[NAME_LEN+1];                 // buffer to store db in utf8 
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    char *db= passwd;
    uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ? 
      *passwd++ : strlen(passwd);
    db+= passwd_len + 1;
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    /* Small check for incomming packet */
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    if ((uint) ((uchar*) db - net->read_pos) > packet_length)
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    {
      send_error(thd, ER_UNKNOWN_COM_ERROR);
      break;
    }
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    /* Convert database name to utf8 */
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    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
                             system_charset_info, db, strlen(db),
                             thd->charset())]= 0;
    db= db_buff;
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    /* Save user and privileges */
    uint save_master_access= thd->master_access;
    uint save_db_access= thd->db_access;
    uint save_db_length= thd->db_length;
    char *save_user= thd->user;
    char *save_priv_user= thd->priv_user;
    char *save_db= thd->db;
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    USER_CONN *save_user_connect= thd->user_connect;
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    if (!(thd->user= my_strdup(user, MYF(0))))
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    {
      thd->user= save_user;
      send_error(thd, ER_OUT_OF_RESOURCES);
      break;
    }
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    /* Clear variables that are allocated */
    thd->user_connect= 0;
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    int res= check_user(thd, COM_CHANGE_USER, passwd, passwd_len, db, false);
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    if (res)
    {
      /* authentification failure, we shall restore old user */
      if (res > 0)
        send_error(thd, ER_UNKNOWN_COM_ERROR);
      x_free(thd->user);
      thd->user= save_user;
      thd->priv_user= save_priv_user;
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      thd->user_connect= save_user_connect;
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      thd->master_access= save_master_access;
      thd->db_access= save_db_access;
      thd->db= save_db;
      thd->db_length= save_db_length;
    }
    else
    {
      /* we've authenticated new user */
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      if (save_user_connect)
	decrease_user_connections(save_user_connect);
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      x_free((gptr) save_db);
      x_free((gptr) save_user);
    }
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    break;
  }
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#endif /* EMBEDDED_LIBRARY */
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  case COM_EXECUTE:
  {
1320
    mysql_stmt_execute(thd, packet);
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    break;
  }
  case COM_LONG_DATA:
  {
1325
    mysql_stmt_get_longdata(thd, packet, packet_length);
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    break;
  }
  case COM_PREPARE:
  {
1330
    mysql_stmt_prepare(thd, packet, packet_length);
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    break;
  }
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  case COM_CLOSE_STMT:
  {
    mysql_stmt_free(thd, packet);
    break;
  }
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  case COM_RESET_STMT:
  {
    mysql_stmt_reset(thd, packet);
    break;
  }
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  case COM_QUERY:
  {
1345 1346
    if (alloc_query(thd, packet, packet_length))
      break;					// fatal error is set
1347
    mysql_log.write(thd,command,"%s",thd->query);
1348
    DBUG_PRINT("query",("%-.4096s",thd->query));
1349
    mysql_parse(thd,thd->query, thd->query_length);
1350

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    while (!thd->killed && !thd->is_fatal_error && thd->lex.found_colon)
1352
    {
1353
      char *packet= thd->lex.found_colon;
1354
      /*
1355 1356 1357
        Multiple queries exits, execute them individually
      */
      if (thd->lock || thd->open_tables || thd->derived_tables)
1358
        close_thread_tables(thd);
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1360
      ulong length= thd->query_length-(ulong)(thd->lex.found_colon-thd->query);
1361

1362
      /* Remove garbage at start of query */
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      while (my_isspace(thd->charset(), *packet) && length > 0)
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      {
        packet++;
        length--;
      }
      thd->query_length= length;
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      thd->query= packet;
      VOID(pthread_mutex_lock(&LOCK_thread_count));
      thd->query_id= query_id++;
      VOID(pthread_mutex_unlock(&LOCK_thread_count));
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      mysql_parse(thd, packet, length);
    }

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    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),WAIT_PRIOR);
    DBUG_PRINT("info",("query ready"));
    break;
  }
1381
  case COM_FIELD_LIST:				// This isn't actually needed
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#ifdef DONT_ALLOW_SHOW_COMMANDS
1383
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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    break;
#else
  {
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    char *fields, *pend;
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    TABLE_LIST table_list;
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    LEX_STRING conv_name;

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    statistic_increment(com_stat[SQLCOM_SHOW_FIELDS],&LOCK_status);
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    bzero((char*) &table_list,sizeof(table_list));
    if (!(table_list.db=thd->db))
    {
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      send_error(thd,ER_NO_DB_ERROR);
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      break;
    }
    thd->free_list=0;
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    pend= strend(packet);
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    thd->convert_string(&conv_name, system_charset_info,
			packet, (uint) (pend-packet), thd->charset());
    table_list.alias= table_list.real_name= conv_name.str;
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    packet= pend+1;
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    // command not cachable => no gap for data base name
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    if (!(thd->query=fields=thd->memdup(packet,thd->query_length+1)))
      break;
1407
    mysql_log.write(thd,command,"%s %s",table_list.real_name,fields);
1408
    if (lower_case_table_names)
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      my_casedn_str(files_charset_info, table_list.real_name);
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    remove_escape(table_list.real_name);	// This can't have wildcards

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#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,SELECT_ACL,table_list.db,&thd->col_access,0,0))
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      break;
    table_list.grant.privilege=thd->col_access;
    if (grant_option && check_grant(thd,SELECT_ACL,&table_list,2))
      break;
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#endif /*DONT_ALLOW_SHOW_COMMANDS*/
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    mysqld_list_fields(thd,&table_list,fields);
1420
    free_items(thd->free_list);
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    break;
  }
#endif
  case COM_QUIT:
1425
    /* We don't calculate statistics for this command */
1426
    mysql_log.write(thd,command,NullS);
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    net->error=0;				// Don't give 'abort' message
    error=TRUE;					// End server
    break;

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  case COM_CREATE_DB:				// QQ: To be removed
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    {
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      statistic_increment(com_stat[SQLCOM_CREATE_DB],&LOCK_status);
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      char *db=thd->strdup(packet);
1435
      // null test to handle EOM
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      if (!db || !strip_sp(db) || check_db_name(db))
1437
      {
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	net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
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	break;
      }
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      if (check_access(thd,CREATE_ACL,db,0,1,0))
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	break;
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      mysql_log.write(thd,command,packet);
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      mysql_create_db(thd,db,0,0);
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      break;
    }
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  case COM_DROP_DB:				// QQ: To be removed
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    {
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      statistic_increment(com_stat[SQLCOM_DROP_DB],&LOCK_status);
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      char *db=thd->strdup(packet);
1451
      // null test to handle EOM
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      if (!db || !strip_sp(db) || check_db_name(db))
1453
      {
1454
	net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
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	break;
      }
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      if (check_access(thd,DROP_ACL,db,0,1,0))
1458
	break;
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      if (thd->locked_tables || thd->active_transaction())
      {
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	send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
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	break;
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      }
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      mysql_log.write(thd,command,db);
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      mysql_rm_db(thd,db,0,0);
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      break;
    }
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#ifndef EMBEDDED_LIBRARY
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  case COM_BINLOG_DUMP:
    {
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      statistic_increment(com_other,&LOCK_status);
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      thd->slow_command = TRUE;
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      if (check_global_access(thd, REPL_SLAVE_ACL))
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	break;
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      mysql_log.write(thd,command, 0);
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      ulong pos;
      ushort flags;
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      uint32 slave_server_id;
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      /* TODO: The following has to be changed to an 8 byte integer */
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      pos = uint4korr(packet);
      flags = uint2korr(packet + 4);
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      thd->server_id=0; /* avoid suicide */
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      if ((slave_server_id= uint4korr(packet+6))) // mysqlbinlog.server_id==0
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	kill_zombie_dump_threads(slave_server_id);
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      thd->server_id = slave_server_id;
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      mysql_binlog_send(thd, thd->strdup(packet + 10), (my_off_t) pos, flags);
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      unregister_slave(thd,1,1);
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      // fake COM_QUIT -- if we get here, the thread needs to terminate
      error = TRUE;
      net->error = 0;
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      break;
    }
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#endif
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  case COM_REFRESH:
    {
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      statistic_increment(com_stat[SQLCOM_FLUSH],&LOCK_status);
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      ulong options= (ulong) (uchar) packet[0];
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      if (check_global_access(thd,RELOAD_ACL))
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	break;
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      mysql_log.write(thd,command,NullS);
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      if (reload_acl_and_cache(thd, options, (TABLE_LIST*) 0, NULL))
        send_error(thd, 0);
      else
        send_ok(thd);
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      break;
    }
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#ifndef EMBEDDED_LIBRARY
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  case COM_SHUTDOWN:
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    statistic_increment(com_other,&LOCK_status);
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    if (check_global_access(thd,SHUTDOWN_ACL))
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      break; /* purecov: inspected */
    DBUG_PRINT("quit",("Got shutdown command"));
1514
    mysql_log.write(thd,command,NullS);
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    send_eof(thd);
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#ifdef __WIN__
    sleep(1);					// must wait after eof()
#endif
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#ifndef OS2
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    send_eof(thd);				// This is for 'quit request'
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#endif
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    close_connection(thd, 0, 1);
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    close_thread_tables(thd);			// Free before kill
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    free_root(&thd->mem_root,MYF(0));
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    free_root(&thd->transaction.mem_root,MYF(0));
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    kill_mysql();
    error=TRUE;
    break;
1529
#endif
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  case COM_STATISTICS:
  {
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    mysql_log.write(thd,command,NullS);
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    statistic_increment(com_stat[SQLCOM_SHOW_STATUS],&LOCK_status);
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#ifndef EMBEDDED_LIBRARY
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    char buff[200];
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#else
    char *buff= thd->net.last_error;
#endif
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    ulong uptime = (ulong) (thd->start_time - start_time);
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    sprintf((char*) buff,
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	    "Uptime: %ld  Threads: %d  Questions: %lu  Slow queries: %ld  Opens: %ld  Flush tables: %ld  Open tables: %u  Queries per second avg: %.3f",
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	    uptime,
	    (int) thread_count,thd->query_id,long_query_count,
	    opened_tables,refresh_version, cached_tables(),
	    uptime ? (float)thd->query_id/(float)uptime : 0);
#ifdef SAFEMALLOC
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    if (sf_malloc_cur_memory)				// Using SAFEMALLOC
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      sprintf(strend(buff), "  Memory in use: %ldK  Max memory used: %ldK",
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	      (sf_malloc_cur_memory+1023L)/1024L,
	      (sf_malloc_max_memory+1023L)/1024L);
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#endif
#ifndef EMBEDDED_LIBRARY
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    VOID(my_net_write(net, buff,(uint) strlen(buff)));
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    VOID(net_flush(net));
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#endif
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    break;
  }
  case COM_PING:
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    statistic_increment(com_other,&LOCK_status);
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    send_ok(thd);				// Tell client we are alive
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    break;
  case COM_PROCESS_INFO:
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    statistic_increment(com_stat[SQLCOM_SHOW_PROCESSLIST],&LOCK_status);
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
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      break;
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#endif
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    mysql_log.write(thd,command,NullS);
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    mysqld_list_processes(thd,
#ifndef NO_EMBEDDED_ACCESS_CHECKS
			  thd->master_access & PROCESS_ACL ? 
			  NullS : thd->priv_user
#else
			  NullS
#endif
			  ,0);
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    break;
  case COM_PROCESS_KILL:
  {
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    statistic_increment(com_stat[SQLCOM_KILL],&LOCK_status);
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    ulong id=(ulong) uint4korr(packet);
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    kill_one_thread(thd,id);
    break;
  }
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  case COM_SET_OPTION:
  {
    statistic_increment(com_stat[SQLCOM_SET_OPTION], &LOCK_status);
    enum_mysql_set_option command= (enum_mysql_set_option) uint2korr(packet);
    switch (command) {
    case MYSQL_OPTION_MULTI_STATEMENTS_ON:
      thd->client_capabilities|= CLIENT_MULTI_STATEMENTS;
      break;
    case MYSQL_OPTION_MULTI_STATEMENTS_OFF:
      thd->client_capabilities&= ~CLIENT_MULTI_STATEMENTS;
      break;
    default:
      send_error(thd, ER_UNKNOWN_COM_ERROR);
      break;
    }
    break;
  }
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  case COM_DEBUG:
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    statistic_increment(com_other,&LOCK_status);
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    if (check_global_access(thd, SUPER_ACL))
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      break;					/* purecov: inspected */
    mysql_print_status(thd);
1607
    mysql_log.write(thd,command,NullS);
1608
    send_eof(thd);
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    break;
  case COM_SLEEP:
  case COM_CONNECT:				// Impossible here
  case COM_TIME:				// Impossible from client
  case COM_DELAYED_INSERT:
1614
  case COM_END:
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  default:
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    send_error(thd, ER_UNKNOWN_COM_ERROR);
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    break;
  }
1619
  if (thd->lock || thd->open_tables || thd->derived_tables)
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  {
    thd->proc_info="closing tables";
    close_thread_tables(thd);			/* Free tables */
  }

1625
  if (thd->is_fatal_error)
1626
    send_error(thd,0);				// End of memory ?
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  time_t start_of_query=thd->start_time;
1629
  thd->end_time();				// Set start time
1630

1631
  /* If not reading from backup and if the query took too long */
1632
  if (!thd->slow_command && !thd->user_time) // do not log 'slow_command' queries
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  {
1634 1635
    thd->proc_info="logging slow query";

1636 1637
    if ((ulong) (thd->start_time - thd->time_after_lock) >
	thd->variables.long_query_time ||
1638
	((thd->lex.select_lex.options &
1639
	  (QUERY_NO_INDEX_USED | QUERY_NO_GOOD_INDEX_USED)) &&
1640
	 (specialflag & SPECIAL_LOG_QUERIES_NOT_USING_INDEXES)))
1641 1642 1643 1644
    {
      long_query_count++;
      mysql_slow_log.write(thd, thd->query, thd->query_length, start_of_query);
    }
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  }
1646
  thd->proc_info="cleaning up";
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  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For process list
  thd->proc_info=0;
  thd->command=COM_SLEEP;
  thd->query=0;
  thread_running--;
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
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  thd->packet.shrink(thd->variables.net_buffer_length);	// Reclaim some memory
1654
  free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
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  DBUG_RETURN(error);
}

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/*
  Read query from packet and store in thd->query
  Used in COM_QUERY and COM_PREPARE

  DESCRIPTION
    Sets the following THD variables:
      query
      query_length

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

bool alloc_query(THD *thd, char *packet, ulong packet_length)
{
  packet_length--;				// Remove end null
1676
  /* Remove garbage at start and end of query */
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  while (my_isspace(thd->charset(),packet[0]) && packet_length > 0)
1678 1679 1680 1681 1682
  {
    packet++;
    packet_length--;
  }
  char *pos=packet+packet_length;		// Point at end null
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  while (packet_length > 0 &&
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	 (pos[-1] == ';' || my_isspace(thd->charset() ,pos[-1])))
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  {
    pos--;
    packet_length--;
  }
  /* We must allocate some extra memory for query cache */
  if (!(thd->query= (char*) thd->memdup_w_gap((gptr) (packet),
					      packet_length,
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					      thd->db_length+ 1 +
					      QUERY_CACHE_FLAGS_SIZE)))
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    return 1;
  thd->query[packet_length]=0;
  thd->query_length= packet_length;
  thd->packet.shrink(thd->variables.net_buffer_length);// Reclaim some memory

  if (!(specialflag & SPECIAL_NO_PRIOR))
    my_pthread_setprio(pthread_self(),QUERY_PRIOR);
  return 0;
}

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/****************************************************************************
** mysql_execute_command
** Execute command saved in thd and current_lex->sql_command
****************************************************************************/

void
1710
mysql_execute_command(THD *thd)
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{
1712
  int	res= 0;
1713
  LEX	*lex= &thd->lex;
1714
  TABLE_LIST *tables= (TABLE_LIST*) lex->select_lex.table_list.first;
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  SELECT_LEX *select_lex= &lex->select_lex;
1716
  SELECT_LEX_UNIT *unit= &lex->unit;
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  DBUG_ENTER("mysql_execute_command");

1719 1720 1721 1722 1723 1724
  /*
    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.
  */
1725
  if (tables || &lex->select_lex != lex->all_selects_list)
1726 1727
    mysql_reset_errors(thd);

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#ifdef HAVE_REPLICATION
1729 1730
  if (thd->slave_thread)
  {
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    /*
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      Skip if we are in the slave thread, some table rules have been
      given and the table list says the query should not be replicated
    */
    if (table_rules_on && tables && !tables_ok(thd,tables))
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    {
      /* we warn the slave SQL thread */
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
1739
      DBUG_VOID_RETURN;
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    }
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#ifndef TO_BE_DELETED
    /*
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      This is a workaround to deal with the shortcoming in 3.23.44-3.23.46
      masters in RELEASE_LOCK() logging. We re-write SELECT RELEASE_LOCK()
      as DO RELEASE_LOCK()
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    */
1747 1748 1749
    if (lex->sql_command == SQLCOM_SELECT)
    {
      lex->sql_command = SQLCOM_DO;
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      lex->insert_list = &select_lex->item_list;
1751
    }
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#endif
1753
  }
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#endif /* !HAVE_REPLICATION */
1755
  /*
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    TODO: make derived tables processing 'inside' SELECT processing.
    TODO: solve problem with depended derived tables in subselects
1758
  */
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  if (lex->derived_tables)
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  {
1761 1762 1763
    for (SELECT_LEX *sl= lex->all_selects_list;
	 sl;
	 sl= sl->next_select_in_list())
1764
    {
1765 1766 1767
      for (TABLE_LIST *cursor= sl->get_table_list();
	   cursor;
	   cursor= cursor->next)
1768
      {
1769 1770 1771
	if (cursor->derived && (res=mysql_derived(thd, lex,
						  cursor->derived,
						  cursor)))
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	{
1773 1774 1775 1776
	  if (res < 0 || thd->net.report_error)
	    send_error(thd,thd->killed ? ER_SERVER_SHUTDOWN : 0);
	  DBUG_VOID_RETURN;
	}
1777 1778
      }
    }
1779
  }
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  if (&lex->select_lex != lex->all_selects_list &&
      lex->unit.create_total_list(thd, lex, &tables, 0))
1782
    DBUG_VOID_RETURN;
1783 1784 1785 1786 1787 1788
  
  /*
    When option readonly is set deny operations which change tables.
    Except for the replication thread and the 'super' users.
  */
  if (opt_readonly &&
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      !(thd->slave_thread
#ifndef NO_EMBEDDED_ACCESS_CHECKS
	|| (thd->master_access & SUPER_ACL)
#endif
	) &&
1794 1795
      (uc_update_queries[lex->sql_command] > 0))
  {
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    send_error(thd, ER_CANT_UPDATE_WITH_READLOCK);
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    DBUG_VOID_RETURN;
  }
1799

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  statistic_increment(com_stat[lex->sql_command],&LOCK_status);
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  switch (lex->sql_command) {
  case SQLCOM_SELECT:
  {
1804
    select_result *result=lex->result;
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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    if (tables)
    {
      res=check_table_access(thd,
			     lex->exchange ? SELECT_ACL | FILE_ACL :
			     SELECT_ACL,
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			     tables,0);
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    }
    else
      res=check_access(thd, lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL,
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		       any_db,0,0,0);
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    if (res)
    {
      res=0;
      break;					// Error message is given
    }
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#endif
1822 1823 1824 1825
    /* 
       In case of single SELECT unit->global_parameters points on first SELECT
       TODO: move counters to SELECT_LEX
    */
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    unit->offset_limit_cnt= (ha_rows) unit->global_parameters->offset_limit;
    unit->select_limit_cnt= (ha_rows) (unit->global_parameters->select_limit+
      unit->global_parameters->offset_limit);
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    if (unit->select_limit_cnt <
1830
	(ha_rows) unit->global_parameters->select_limit)
1831
      unit->select_limit_cnt= HA_POS_ERROR;		// no limit
1832
    if (unit->select_limit_cnt == HA_POS_ERROR && !select_lex->next_select())
1833
      select_lex->options&= ~OPTION_FOUND_ROWS;
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    if (!(res=open_and_lock_tables(thd,tables)))
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    {
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      if (lex->describe)
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      {
1839 1840 1841 1842 1843 1844 1845
	if (!(result= new select_send()))
	{
	  send_error(thd, ER_OUT_OF_RESOURCES);
	  DBUG_VOID_RETURN;
	}
	else
	  thd->send_explain_fields(result);
1846
	fix_tables_pointers(lex->all_selects_list);
1847
	res= mysql_explain_union(thd, &thd->lex.unit, result);
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	MYSQL_LOCK *save_lock= thd->lock;
	thd->lock= (MYSQL_LOCK *)0;
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	if (lex->describe & DESCRIBE_EXTENDED)
	{
	  char buff[1024];
	  String str(buff,(uint32) sizeof(buff), system_charset_info);
	  str.length(0);
	  thd->lex.unit.print(&str);
	  str.append('\0');
	  push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
		       ER_YES, str.ptr());
	}
1860
	result->send_eof();
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	thd->lock= save_lock;
      }
      else
      {
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	if (!result)
	{
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	  if (!(result=new select_send()))
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	  {
	    res= -1;
#ifdef DELETE_ITEMS
	    delete select_lex->having;
	    delete select_lex->where;
#endif
	    break;
	  }
	}
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	query_cache_store_query(thd, tables);
	res=handle_select(thd, lex, result);
      }
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    }
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    break;
  }
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  case SQLCOM_DO:
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    if (tables && ((res= check_table_access(thd, SELECT_ACL, tables,0)) ||
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		   (res= open_and_lock_tables(thd,tables))))
	break;

    fix_tables_pointers(lex->all_selects_list);
    res= mysql_do(thd, *lex->insert_list);
    if (thd->net.report_error)
      res= -1;
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    break;

1895
  case SQLCOM_EMPTY_QUERY:
1896
    send_ok(thd);
1897 1898
    break;

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

1903
#ifndef EMBEDDED_LIBRARY
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  case SQLCOM_PURGE:
1905
  {
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    if (check_global_access(thd, SUPER_ACL))
1907
      goto error;
1908
    // PURGE MASTER LOGS TO 'file'
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    res = purge_master_logs(thd, lex->to_log);
    break;
  }
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  case SQLCOM_PURGE_BEFORE:
  {
    if (check_global_access(thd, SUPER_ACL))
      goto error;
    // PURGE MASTER LOGS BEFORE 'data'
    res = purge_master_logs_before_date(thd, lex->purge_time);
    break;
  }
1920
#endif
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  case SQLCOM_SHOW_WARNS:
  {
1923 1924
    res= mysqld_show_warnings(thd, (ulong)
			      ((1L << (uint) MYSQL_ERROR::WARN_LEVEL_NOTE) |
1925 1926 1927
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_WARN) |
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR)
			       ));
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    break;
  }
  case SQLCOM_SHOW_ERRORS:
  {
1932 1933
    res= mysqld_show_warnings(thd, (ulong)
			      (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR));
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    break;
  }
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  case SQLCOM_SHOW_NEW_MASTER:
  {
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    if (check_global_access(thd, REPL_SLAVE_ACL))
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      goto error;
1940
    /* This query don't work now. See comment in repl_failsafe.cc */
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#ifndef WORKING_NEW_MASTER
1942
    net_printf(thd, ER_NOT_SUPPORTED_YET, "SHOW NEW MASTER");
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    res= 1;
#else
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    res = show_new_master(thd);
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#endif
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    break;
  }
1949

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#ifdef HAVE_REPLICATION
1951 1952
  case SQLCOM_SHOW_SLAVE_HOSTS:
  {
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    if (check_global_access(thd, REPL_SLAVE_ACL))
1954 1955 1956 1957
      goto error;
    res = show_slave_hosts(thd);
    break;
  }
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  case SQLCOM_SHOW_BINLOG_EVENTS:
  {
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    if (check_global_access(thd, REPL_SLAVE_ACL))
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      goto error;
    res = show_binlog_events(thd);
    break;
  }
1965 1966
#endif

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  case SQLCOM_BACKUP_TABLE:
1968 1969
  {
    if (check_db_used(thd,tables) ||
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	check_table_access(thd,SELECT_ACL, tables,0) ||
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	check_global_access(thd, FILE_ACL))
1972
      goto error; /* purecov: inspected */
1973
    thd->slow_command=TRUE;
1974
    res = mysql_backup_table(thd, tables);
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1976 1977
    break;
  }
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  case SQLCOM_RESTORE_TABLE:
1979 1980
  {
    if (check_db_used(thd,tables) ||
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	check_table_access(thd, INSERT_ACL, tables,0) ||
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1982
	check_global_access(thd, FILE_ACL))
1983
      goto error; /* purecov: inspected */
1984
    thd->slow_command=TRUE;
1985 1986 1987
    res = mysql_restore_table(thd, tables);
    break;
  }
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1988 1989 1990
  case SQLCOM_ASSIGN_TO_KEYCACHE:
  {
    if (check_db_used(thd, tables) ||
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1991 1992
        check_access(thd, INDEX_ACL, tables->db,
                     &tables->grant.privilege, 0, 0))
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      goto error;
1994
    res= mysql_assign_to_keycache(thd, tables, &lex->name_and_length);
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    break;
  }
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  case SQLCOM_PRELOAD_KEYS:
  {
    if (check_db_used(thd, tables) ||
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2000 2001
	check_access(thd, INDEX_ACL, tables->db,
                     &tables->grant.privilege, 0, 0))
2002
      goto error;
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    res = mysql_preload_keys(thd, tables);
    break;
  }
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#ifdef HAVE_REPLICATION
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2007
  case SQLCOM_CHANGE_MASTER:
2008
  {
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2009
    if (check_global_access(thd, SUPER_ACL))
2010
      goto error;
2011 2012 2013
    LOCK_ACTIVE_MI;
    res = change_master(thd,active_mi);
    UNLOCK_ACTIVE_MI;
2014 2015
    break;
  }
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  case SQLCOM_SHOW_SLAVE_STAT:
2017
  {
2018 2019
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2020
      goto error;
2021 2022 2023
    LOCK_ACTIVE_MI;
    res = show_master_info(thd,active_mi);
    UNLOCK_ACTIVE_MI;
2024 2025
    break;
  }
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2026
  case SQLCOM_SHOW_MASTER_STAT:
2027
  {
2028 2029
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2030 2031 2032 2033
      goto error;
    res = show_binlog_info(thd);
    break;
  }
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2035
  case SQLCOM_LOAD_MASTER_DATA: // sync with master
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2036
    if (check_global_access(thd, SUPER_ACL))
2037
      goto error;
2038 2039 2040 2041
    if (end_active_trans(thd))
      res= -1;
    else
      res = load_master_data(thd);
2042
    break;
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#endif /* HAVE_REPLICATION */
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2044 2045 2046
#ifdef HAVE_INNOBASE_DB
  case SQLCOM_SHOW_INNODB_STATUS:
    {
2047
      if (check_global_access(thd, SUPER_ACL))
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	goto error;
      res = innodb_show_status(thd);
      break;
    }
#endif
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2053
#ifdef HAVE_REPLICATION
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2054
  case SQLCOM_LOAD_MASTER_TABLE:
2055
  {
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    if (!tables->db)
      tables->db=thd->db;
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,CREATE_ACL,tables->db,&tables->grant.privilege,0,0))
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2060 2061 2062 2063 2064 2065 2066 2067 2068
      goto error;				/* purecov: inspected */
    if (grant_option)
    {
      /* Check that the first table has CREATE privilege */
      TABLE_LIST *tmp_table_list=tables->next;
      tables->next=0;
      bool error=check_grant(thd,CREATE_ACL,tables);
      tables->next=tmp_table_list;
      if (error)
2069
	goto error;
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    }
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#endif
2072
    if (strlen(tables->real_name) > NAME_LEN)
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    {
2074
      net_printf(thd,ER_WRONG_TABLE_NAME, tables->real_name);
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      break;
    }
2077
    LOCK_ACTIVE_MI;
2078 2079 2080 2081
    /*
      fetch_master_table will send the error to the client on failure.
      Give error if the table already exists.
    */
2082
    if (!fetch_master_table(thd, tables->db, tables->real_name,
2083
			    active_mi, 0, 0))
2084
    {
2085
      send_ok(thd);
2086 2087
    }
    UNLOCK_ACTIVE_MI;
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    break;
2089
  }
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#endif /* HAVE_REPLICATION */
2091

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  case SQLCOM_CREATE_TABLE:
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  {
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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    ulong want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
		      CREATE_TMP_ACL : CREATE_ACL);
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#endif
2098 2099
    if (!tables->db)
      tables->db=thd->db;
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,want_priv,tables->db,&tables->grant.privilege,0,0) ||
2102 2103 2104
	check_merge_table_access(thd, tables->db,
				 (TABLE_LIST *)
				 lex->create_info.merge_list.first))
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      goto error;				/* purecov: inspected */
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2106
    if (grant_option && want_priv != CREATE_TMP_ACL)
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    {
      /* Check that the first table has CREATE privilege */
      TABLE_LIST *tmp_table_list=tables->next;
      tables->next=0;
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      bool error=check_grant(thd, want_priv, tables);
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      tables->next=tmp_table_list;
      if (error)
	goto error;
    }
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#endif
2117
    if (strlen(tables->real_name) > NAME_LEN)
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    {
2119
      net_printf(thd, ER_WRONG_TABLE_NAME, tables->alias);
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      res=0;
      break;
    }
2123 2124 2125
#ifndef HAVE_READLINK
    lex->create_info.data_file_name=lex->create_info.index_file_name=0;
#else
2126
    /* Fix names if symlinked tables */
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    if (append_file_to_dir(thd, &lex->create_info.data_file_name,
2128
			   tables->real_name) ||
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	append_file_to_dir(thd,&lex->create_info.index_file_name,
2130
			   tables->real_name))
2131 2132 2133 2134
    {
      res=-1;
      break;
    }
2135
#endif
2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148
    /*
      If we are using SET CHARSET without DEFAULT, add an implicite
      DEFAULT to not confuse old users. (This may change).
    */
    if ((lex->create_info.used_fields & 
	 (HA_CREATE_USED_DEFAULT_CHARSET | HA_CREATE_USED_CHARSET)) ==
	HA_CREATE_USED_CHARSET)
    {
      lex->create_info.used_fields&= ~HA_CREATE_USED_CHARSET;
      lex->create_info.used_fields|= HA_CREATE_USED_DEFAULT_CHARSET;
      lex->create_info.default_table_charset= lex->create_info.table_charset;
      lex->create_info.table_charset= 0;
    }
2149
    if (select_lex->item_list.elements)		// With select
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2150 2151 2152 2153
    {
      select_result *result;

      if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
2154
	  find_real_table_in_list(tables->next, tables->db, tables->real_name))
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2155
      {
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2156
	net_printf(thd,ER_UPDATE_TABLE_USED,tables->real_name);
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2157 2158
	DBUG_VOID_RETURN;
      }
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2159
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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2160 2161
      if (tables->next)
      {
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2162
	if (check_table_access(thd, SELECT_ACL, tables->next,0))
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	  goto error;				// Error message is given
      }
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#endif
2166
      select_lex->options|= SELECT_NO_UNLOCK;
2167 2168 2169 2170 2171
      unit->offset_limit_cnt= select_lex->offset_limit;
      unit->select_limit_cnt= select_lex->select_limit+
	select_lex->offset_limit;
      if (unit->select_limit_cnt < select_lex->select_limit)
	unit->select_limit_cnt= HA_POS_ERROR;		// No limit
2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187

      /* Skip first table, which is the table we are creating */
      lex->select_lex.table_list.first=
	(byte*) (((TABLE_LIST *) lex->select_lex.table_list.first)->next);
      if (!(res=open_and_lock_tables(thd,tables->next)))
      {
        if ((result=new select_create(tables->db ? tables->db : thd->db,
                                      tables->real_name, &lex->create_info,
                                      lex->create_list,
                                      lex->key_list,
                                      select_lex->item_list,lex->duplicates)))
          res=handle_select(thd, lex, result);
	else
	  res= -1;
      }
    }
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2188 2189
    else // regular create
    {
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2190 2191 2192 2193
      if (lex->name)
        res= mysql_create_like_table(thd, tables, &lex->create_info, 
                                     (Table_ident *)lex->name); 
      else
2194
      {
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2195 2196 2197 2198
        res= mysql_create_table(thd,tables->db ? tables->db : thd->db,
			         tables->real_name, &lex->create_info,
			         lex->create_list,
			         lex->key_list,0,0,0); // do logging
2199
      }
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2200
      if (!res)
2201
	send_ok(thd);
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    }
    break;
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  }
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2205 2206 2207
  case SQLCOM_CREATE_INDEX:
    if (!tables->db)
      tables->db=thd->db;
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2208 2209
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,INDEX_ACL,tables->db,&tables->grant.privilege,0,0))
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      goto error; /* purecov: inspected */
    if (grant_option && check_grant(thd,INDEX_ACL,tables))
      goto error;
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2213
#endif
2214
    thd->slow_command=TRUE;
2215 2216 2217 2218
    if (end_active_trans(thd))
      res= -1;
    else
      res = mysql_create_index(thd, tables, lex->key_list);
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    break;

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#ifdef HAVE_REPLICATION
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  case SQLCOM_SLAVE_START:
2223 2224 2225 2226
  {
    LOCK_ACTIVE_MI;
    start_slave(thd,active_mi,1 /* net report*/);
    UNLOCK_ACTIVE_MI;
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2227
    break;
2228
  }
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2229
  case SQLCOM_SLAVE_STOP:
2230 2231 2232 2233 2234 2235
  /*
    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,
2236
      so it waits for the client thread because t is locked by it.
2237
    - then the client thread does SLAVE STOP.
2238 2239
      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.
2240 2241 2242 2243 2244
    To prevent that, refuse SLAVE STOP if the
    client thread has locked tables
  */
  if (thd->locked_tables || thd->active_transaction())
  {
2245
    send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
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2246
    break;
2247
  }
2248 2249 2250 2251
  {
    LOCK_ACTIVE_MI;
    stop_slave(thd,active_mi,1/* net report*/);
    UNLOCK_ACTIVE_MI;
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    break;
2253
  }
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#endif /* HAVE_REPLICATION */
2255

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  case SQLCOM_ALTER_TABLE:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
2258
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
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    break;
#else
    {
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      ulong priv=0;
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      if (lex->name && (!lex->name[0] || strlen(lex->name) > NAME_LEN))
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2264
      {
2265
	net_printf(thd, ER_WRONG_TABLE_NAME, lex->name);
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2266 2267 2268
	res=0;
	break;
      }
2269 2270
      if (!tables->db)
	tables->db=thd->db;
2271 2272
      if (!select_lex->db)
	select_lex->db=tables->db;
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      if (check_access(thd,ALTER_ACL,tables->db,&tables->grant.privilege,0,0) ||
	  check_access(thd,INSERT_ACL | CREATE_ACL,select_lex->db,&priv,0,0)||
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	  check_merge_table_access(thd, tables->db,
2276 2277 2278
				   (TABLE_LIST *)
				   lex->create_info.merge_list.first))
	goto error;				/* purecov: inspected */
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      if (!tables->db)
	tables->db=thd->db;
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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2282 2283 2284 2285 2286 2287 2288 2289 2290
      if (grant_option)
      {
	if (check_grant(thd,ALTER_ACL,tables))
	  goto error;
	if (lex->name && !test_all_bits(priv,INSERT_ACL | CREATE_ACL))
	{					// Rename of table
	  TABLE_LIST tmp_table;
	  bzero((char*) &tmp_table,sizeof(tmp_table));
	  tmp_table.real_name=lex->name;
2291
	  tmp_table.db=select_lex->db;
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2292 2293 2294 2295 2296
	  tmp_table.grant.privilege=priv;
	  if (check_grant(thd,INSERT_ACL | CREATE_ACL,tables))
	    goto error;
	}
      }
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#endif
2298 2299
      /* Don't yet allow changing of symlinks with ALTER TABLE */
      lex->create_info.data_file_name=lex->create_info.index_file_name=0;
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      /* ALTER TABLE ends previous transaction */
2301
      if (end_active_trans(thd))
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	res= -1;
      else
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      {
2305
        thd->slow_command=TRUE;
2306
	res= mysql_alter_table(thd, select_lex->db, lex->name,
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2307 2308 2309
			       &lex->create_info,
			       tables, lex->create_list,
			       lex->key_list, lex->drop_list, lex->alter_list,
2310
			       select_lex->order_list.elements,
2311
                               (ORDER *) select_lex->order_list.first,
2312
			       lex->drop_primary, lex->duplicates,
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2313 2314 2315
			       lex->alter_keys_onoff,
                               lex->tablespace_op,
			       lex->simple_alter);
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      }
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      break;
    }
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#endif /*DONT_ALLOW_SHOW_COMMANDS*/
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  case SQLCOM_RENAME_TABLE:
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2321 2322 2323
  {
    TABLE_LIST *table;
    if (check_db_used(thd,tables))
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      goto error;
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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    for (table=tables ; table ; table=table->next->next)
    {
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      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
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2329
		       &table->grant.privilege,0,0) ||
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	  check_access(thd, INSERT_ACL | CREATE_ACL, table->next->db,
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		       &table->next->grant.privilege,0,0))
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	goto error;
      if (grant_option)
      {
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2335 2336 2337 2338 2339
	TABLE_LIST old_list,new_list;
	old_list=table[0];
	new_list=table->next[0];
	old_list.next=new_list.next=0;
	if (check_grant(thd,ALTER_ACL,&old_list) ||
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	    (!test_all_bits(table->next->grant.privilege,
2341
			    INSERT_ACL | CREATE_ACL) &&
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2342
	     check_grant(thd,INSERT_ACL | CREATE_ACL, &new_list)))
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	  goto error;
      }
    }
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#endif
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    query_cache_invalidate3(thd, tables, 0);
2348 2349 2350
    if (end_active_trans(thd))
      res= -1;
    else if (mysql_rename_tables(thd,tables))
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      res= -1;
    break;
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  }
2354
#ifndef EMBEDDED_LIBRARY
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  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2357
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
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    DBUG_VOID_RETURN;
#else
    {
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2361
      if (check_global_access(thd, SUPER_ACL))
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	goto error;
      res = show_binlogs(thd);
      break;
    }
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#endif
2367
#endif /* EMBEDDED_LIBRARY */
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  case SQLCOM_SHOW_CREATE:
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#ifdef DONT_ALLOW_SHOW_COMMANDS
2370
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
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    DBUG_VOID_RETURN;
#else
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    {
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      if (check_db_used(thd, tables) ||
	  check_access(thd, SELECT_ACL | EXTRA_ACL, tables->db,
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		       &tables->grant.privilege,0,0))
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	goto error;
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      res = mysqld_show_create(thd, tables);
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      break;
    }
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#endif
2382 2383 2384
  case SQLCOM_CHECKSUM:
  {
    if (check_db_used(thd,tables) ||
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	check_table_access(thd, SELECT_ACL | EXTRA_ACL , tables,0))
2386
      goto error; /* purecov: inspected */
2387
    res = mysql_checksum_table(thd, tables, &lex->check_opt);
2388 2389
    break;
  }
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  case SQLCOM_REPAIR:
2391 2392
  {
    if (check_db_used(thd,tables) ||
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	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables,0))
2394
      goto error; /* purecov: inspected */
2395
    thd->slow_command=TRUE;
2396
    res = mysql_repair_table(thd, tables, &lex->check_opt);
2397 2398 2399 2400 2401 2402 2403 2404 2405 2406
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      mysql_update_log.write(thd, thd->query, thd->query_length);
      if (mysql_bin_log.is_open())
      {
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
        mysql_bin_log.write(&qinfo);
      }
    }
2407 2408
    break;
  }
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  case SQLCOM_CHECK:
2410 2411
  {
    if (check_db_used(thd,tables) ||
2412
	check_table_access(thd, SELECT_ACL | EXTRA_ACL , tables,0))
2413
      goto error; /* purecov: inspected */
2414
    thd->slow_command=TRUE;
2415 2416 2417
    res = mysql_check_table(thd, tables, &lex->check_opt);
    break;
  }
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  case SQLCOM_ANALYZE:
  {
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    if (check_db_used(thd,tables) ||
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	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables,0))
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      goto error; /* purecov: inspected */
2423
    thd->slow_command=TRUE;
2424
    res = mysql_analyze_table(thd, tables, &lex->check_opt);
2425 2426 2427 2428 2429 2430 2431 2432 2433 2434
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      mysql_update_log.write(thd, thd->query, thd->query_length);
      if (mysql_bin_log.is_open())
      {
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
        mysql_bin_log.write(&qinfo);
      }
    }
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    break;
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  }
2437

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  case SQLCOM_OPTIMIZE:
  {
    HA_CREATE_INFO create_info;
2441
    if (check_db_used(thd,tables) ||
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	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables,0))
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      goto error; /* purecov: inspected */
2444
    thd->slow_command=TRUE;
2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455
    if (specialflag & (SPECIAL_SAFE_MODE | SPECIAL_NO_NEW_FUNC))
    {
      /* Use ALTER TABLE */
      lex->create_list.empty();
      lex->key_list.empty();
      lex->col_list.empty();
      lex->drop_list.empty();
      lex->alter_list.empty();
      bzero((char*) &create_info,sizeof(create_info));
      create_info.db_type=DB_TYPE_DEFAULT;
      create_info.row_type=ROW_TYPE_DEFAULT;
2456
      create_info.default_table_charset=default_charset_info;
2457 2458 2459
      res= mysql_alter_table(thd, NullS, NullS, &create_info,
			     tables, lex->create_list,
			     lex->key_list, lex->drop_list, lex->alter_list,
2460 2461
                             0, (ORDER *) 0,
			     0, DUP_ERROR);
2462 2463 2464
    }
    else
      res = mysql_optimize_table(thd, tables, &lex->check_opt);
2465 2466 2467 2468 2469 2470 2471 2472 2473 2474
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      mysql_update_log.write(thd, thd->query, thd->query_length);
      if (mysql_bin_log.is_open())
      {
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
        mysql_bin_log.write(&qinfo);
      }
    }
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    break;
  }
  case SQLCOM_UPDATE:
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    if (check_db_used(thd,tables))
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      goto error;
2480

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    if (single_table_command_access(thd, UPDATE_ACL, tables, &res))
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	goto error;
2483
    if (select_lex->item_list.elements != lex->value_list.elements)
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    {
2485
      send_error(thd,ER_WRONG_VALUE_COUNT);
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      DBUG_VOID_RETURN;
    }
2488 2489 2490 2491
    res= mysql_update(thd,tables,
                      select_lex->item_list,
                      lex->value_list,
                      select_lex->where,
2492
		      select_lex->order_list.elements,
2493 2494 2495
                      (ORDER *) select_lex->order_list.first,
                      select_lex->select_limit,
                      lex->duplicates);
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    if (thd->net.report_error)
      res= -1;
2498 2499
    break;
  case SQLCOM_UPDATE_MULTI:
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,UPDATE_ACL,tables->db,&tables->grant.privilege,0,0))
2502 2503 2504
      goto error;
    if (grant_option && check_grant(thd,UPDATE_ACL,tables))
      goto error;
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#endif
2506
    if (select_lex->item_list.elements != lex->value_list.elements)
2507
    {
2508 2509
      send_error(thd,ER_WRONG_VALUE_COUNT);
      DBUG_VOID_RETURN;
2510 2511
    }
    {
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      const char *msg= 0;
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      if (select_lex->order_list.elements)
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	msg= "ORDER BY";
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      else if (select_lex->select_limit && select_lex->select_limit !=
	       HA_POS_ERROR)
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	msg= "LIMIT";
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      if (msg)
2519
      {
2520
	net_printf(thd, ER_WRONG_USAGE, "UPDATE", msg);
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	res= 1;
	break;
2523
      }
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      res= mysql_multi_update(thd,tables,
			      &select_lex->item_list,
			      &lex->value_list,
			      select_lex->where,
			      select_lex->options,
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			      lex->duplicates, unit, select_lex);
2530
    }
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    break;
  case SQLCOM_REPLACE:
2533 2534
  case SQLCOM_INSERT:
  {
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
2536
    my_bool update=(lex->value_list.elements ? UPDATE_ACL : 0);
2537
    ulong privilege= (lex->duplicates == DUP_REPLACE ?
2538
                      INSERT_ACL | DELETE_ACL : INSERT_ACL | update);
2539

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    if (single_table_command_access(thd, privilege, tables, &res))
2541
	goto error;
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#else
    my_bool update=(lex->value_list.elements ? 1 : 0);
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#endif
2545 2546 2547 2548 2549
    if (select_lex->item_list.elements != lex->value_list.elements)
    {
      send_error(thd,ER_WRONG_VALUE_COUNT);
      DBUG_VOID_RETURN;
    }
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    res = mysql_insert(thd,tables,lex->field_list,lex->many_values,
2551
                       select_lex->item_list, lex->value_list,
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2552
                       (update ? DUP_UPDATE : lex->duplicates));
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2553 2554
    if (thd->net.report_error)
      res= -1;
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    break;
2556
  }
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  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
2560

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    /*
      Check that we have modify privileges for the first table and
      select privileges for the rest
    */
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
2566
    {
2567 2568
      ulong privilege= (lex->duplicates == DUP_REPLACE ?
                        INSERT_ACL | DELETE_ACL : INSERT_ACL);
2569 2570 2571
      TABLE_LIST *save_next=tables->next;
      tables->next=0;
      if (check_access(thd, privilege,
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		       tables->db,&tables->grant.privilege,0,0) ||
2573 2574
	  (grant_option && check_grant(thd, privilege, tables)))
	goto error;
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2576
      tables->next=save_next;
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      if ((res=check_table_access(thd, SELECT_ACL, save_next,0)))
2578 2579
	goto error;
    }
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#endif
2581 2582
    /* Don't unlock tables until command is written to binary log */
    select_lex->options|= SELECT_NO_UNLOCK;
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    select_result *result;
2585 2586 2587 2588
    unit->offset_limit_cnt= select_lex->offset_limit;
    unit->select_limit_cnt= select_lex->select_limit+select_lex->offset_limit;
    if (unit->select_limit_cnt < select_lex->select_limit)
      unit->select_limit_cnt= HA_POS_ERROR;		// No limit
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2590
    if (find_real_table_in_list(tables->next, tables->db, tables->real_name))
2591
    {
2592 2593
      /* Using same table for INSERT and SELECT */
      select_lex->options |= OPTION_BUFFER_RESULT;
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2594
    }
2595 2596 2597 2598

    /* Skip first table, which is the table we are inserting in */
    lex->select_lex.table_list.first=
      (byte*) (((TABLE_LIST *) lex->select_lex.table_list.first)->next);
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    lex->select_lex.resolve_mode= SELECT_LEX::NOMATTER_MODE;

2601 2602 2603
    if (!(res=open_and_lock_tables(thd, tables)))
    {
      if ((result=new select_insert(tables->table,&lex->field_list,
2604
				    lex->duplicates)))
2605
	res=handle_select(thd,lex,result);
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      if (thd->net.report_error)
	res= -1;
2608 2609 2610
    }
    else
      res= -1;
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    break;
  }
2613
  case SQLCOM_TRUNCATE:
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2614 2615
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,DELETE_ACL,tables->db,&tables->grant.privilege,0,0))
2616
      goto error; /* purecov: inspected */
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    if (grant_option && check_grant(thd,DELETE_ACL,tables))
      goto error;
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#endif
2620 2621 2622 2623 2624 2625
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
    if (thd->locked_tables || thd->active_transaction())
    {
2626
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION,NullS);
2627 2628 2629 2630
      goto error;
    }
    res=mysql_truncate(thd,tables);
    break;
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  case SQLCOM_DELETE:
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2632
  {
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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    if (single_table_command_access(thd, DELETE_ACL, tables, &res))
      goto error;
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    // Set privilege for the WHERE clause
    tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
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#endif
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    res = mysql_delete(thd,tables, select_lex->where,
                       (ORDER*) select_lex->order_list.first,
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                       select_lex->select_limit, select_lex->options);
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    if (thd->net.report_error)
      res= -1;
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    break;
  }
2646
  case SQLCOM_DELETE_MULTI:
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  {
    TABLE_LIST *aux_tables=(TABLE_LIST *)thd->lex.auxilliary_table_list.first;
    TABLE_LIST *auxi;
    uint table_count=0;
    multi_delete *result;
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2652

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    /* sql_yacc guarantees that tables and aux_tables are not zero */
    if (check_db_used(thd, tables) || check_db_used(thd,aux_tables) ||
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2655 2656
	check_table_access(thd,SELECT_ACL, tables,0) ||
	check_table_access(thd,DELETE_ACL, aux_tables,0))
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      goto error;
    if ((thd->options & OPTION_SAFE_UPDATES) && !select_lex->where)
2659
    {
2660
      send_error(thd,ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE);
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2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675
      goto error;
    }
    for (auxi=(TABLE_LIST*) aux_tables ; auxi ; auxi=auxi->next)
    {
      table_count++;
      /* All tables in aux_tables must be found in FROM PART */
      TABLE_LIST *walk;
      for (walk=(TABLE_LIST*) tables ; walk ; walk=walk->next)
      {
	if (!strcmp(auxi->real_name,walk->real_name) &&
	    !strcmp(walk->db,auxi->db))
	  break;
      }
      if (!walk)
      {
2676
	net_printf(thd,ER_NONUNIQ_TABLE,auxi->real_name);
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	goto error;
      }
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      walk->lock_type= auxi->lock_type;
2680
      auxi->table_list=  walk;		// Remember corresponding table
2681
    }
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2682
    if (add_item_to_list(thd, new Item_null()))
2683
    {
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2684
      res= -1;
2685
      break;
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2686 2687 2688 2689 2690 2691
    }
    thd->proc_info="init";
    if ((res=open_and_lock_tables(thd,tables)))
      break;
    /* Fix tables-to-be-deleted-from list to point at opened tables */
    for (auxi=(TABLE_LIST*) aux_tables ; auxi ; auxi=auxi->next)
2692
      auxi->table= auxi->table_list->table;
2693
    if (&lex->select_lex != lex->all_selects_list)
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2694
    {
2695 2696 2697 2698 2699
      for (TABLE_LIST *t= select_lex->get_table_list();
	   t; t= t->next)
      {
	if (find_real_table_in_list(t->table_list->next, t->db, t->real_name))
	{
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2700
	  my_error(ER_UPDATE_TABLE_USED, MYF(0), t->real_name);
2701 2702 2703 2704
	  res= -1;
	  break;
	}
      }
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    }
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    fix_tables_pointers(lex->all_selects_list);
2707 2708
    if (!thd->is_fatal_error && (result= new multi_delete(thd,aux_tables,
							  table_count)))
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    {
2710 2711 2712
      res= mysql_select(thd, &select_lex->ref_pointer_array,
			select_lex->get_table_list(),
			select_lex->with_wild,
2713
			select_lex->item_list,
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2714
			select_lex->where,
2715
			0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
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			(ORDER *)NULL,
			select_lex->options | thd->options |
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			SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK,
2719
			result, unit, select_lex);
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      if (thd->net.report_error)
	res= -1;
2722
      delete result;
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    }
    else
      res= -1;					// Error is not sent
    close_thread_tables(thd);
    break;
  }
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  case SQLCOM_DROP_TABLE:
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  {
2731 2732
    if (!lex->drop_temporary)
    {
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      if (check_table_access(thd,DROP_ACL,tables,0))
2734 2735 2736 2737 2738 2739 2740
	goto error;				/* purecov: inspected */
      if (end_active_trans(thd))
      {
	res= -1;
	break;
      }
    }
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    else
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    {
      /*
	If this is a slave thread, we may sometimes execute some 
	DROP / * 40005 TEMPORARY * / TABLE
	that come from parts of binlogs (likely if we use RESET SLAVE or CHANGE
	MASTER TO), while the temporary table has already been dropped.
	To not generate such irrelevant "table does not exist errors", we
	silently add IF EXISTS if TEMPORARY was used.
      */
      if (thd->slave_thread)
	lex->drop_if_exists= 1;
    }
2754
    res= mysql_rm_table(thd,tables,lex->drop_if_exists, lex->drop_temporary);
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  }
  break;
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  case SQLCOM_DROP_INDEX:
    if (!tables->db)
      tables->db=thd->db;
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,INDEX_ACL,tables->db,&tables->grant.privilege,0,0))
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      goto error;				/* purecov: inspected */
    if (grant_option && check_grant(thd,INDEX_ACL,tables))
      goto error;
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#endif
2766 2767 2768 2769
    if (end_active_trans(thd))
      res= -1;
    else
      res = mysql_drop_index(thd, tables, lex->drop_list);
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    break;
  case SQLCOM_SHOW_DATABASES:
2772
#if defined(DONT_ALLOW_SHOW_COMMANDS)
2773
    send_error(thd,ER_NOT_ALLOWED_COMMAND);   /* purecov: inspected */
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    DBUG_VOID_RETURN;
#else
    if ((specialflag & SPECIAL_SKIP_SHOW_DB) &&
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2777
	check_global_access(thd, SHOW_DB_ACL))
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      goto error;
    res= mysqld_show_dbs(thd, (lex->wild ? lex->wild->ptr() : NullS));
    break;
#endif
  case SQLCOM_SHOW_PROCESSLIST:
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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2784
    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
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      break;
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#endif
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    mysqld_list_processes(thd,
#ifndef NO_EMBEDDED_ACCESS_CHECKS
			  thd->master_access & PROCESS_ACL ? NullS :
			  thd->priv_user
#else
			  NullS
#endif
			  ,lex->verbose);
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    break;
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  case SQLCOM_SHOW_TABLE_TYPES:
    res= mysqld_show_table_types(thd);
    break;
  case SQLCOM_SHOW_PRIVILEGES:
    res= mysqld_show_privileges(thd);
    break;
  case SQLCOM_SHOW_COLUMN_TYPES:
    res= mysqld_show_column_types(thd);
    break;
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  case SQLCOM_SHOW_STATUS:
2806
    res= mysqld_show(thd,(lex->wild ? lex->wild->ptr() : NullS),status_vars,
2807
		     OPT_GLOBAL, &LOCK_status);
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    break;
  case SQLCOM_SHOW_VARIABLES:
    res= mysqld_show(thd, (lex->wild ? lex->wild->ptr() : NullS),
2811 2812
		     init_vars, lex->option_type,
		     &LOCK_global_system_variables);
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    break;
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  case SQLCOM_SHOW_LOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2816
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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    DBUG_VOID_RETURN;
#else
    {
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
      if (grant_option && check_access(thd, FILE_ACL, any_db,0,0,0))
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	goto error;
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#endif
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      res= mysqld_show_logs(thd);
      break;
    }
#endif
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  case SQLCOM_SHOW_TABLES:
2829
    /* FALL THROUGH */
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2830
#ifdef DONT_ALLOW_SHOW_COMMANDS
2831
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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    DBUG_VOID_RETURN;
#else
    {
2835
      char *db=select_lex->db ? select_lex->db : thd->db;
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      if (!db)
      {
2838
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
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	goto error;				/* purecov: inspected */
      }
      remove_escape(db);				// Fix escaped '_'
2842
      if (check_db_name(db))
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unknown committed
2843
      {
2844
        net_printf(thd,ER_WRONG_DB_NAME, db);
2845
        goto error;
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2846
      }
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2847 2848
#ifndef NO_EMBEDDED_ACCESS_CHECKS
      if (check_access(thd,SELECT_ACL,db,&thd->col_access,0,0))
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	goto error;				/* purecov: inspected */
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unknown committed
2850
      if (!thd->col_access && check_grant_db(thd,db))
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2851
      {
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2852
	net_printf(thd, ER_DBACCESS_DENIED_ERROR,
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		   thd->priv_user,
		   thd->priv_host,
		   db);
	goto error;
      }
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#endif
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      /* grant is checked in mysqld_show_tables */
2860
      if (select_lex->options & SELECT_DESCRIBE)
2861
        res= mysqld_extend_show_tables(thd,db,
2862
				       (lex->wild ? lex->wild->ptr() : NullS));
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      else
	res= mysqld_show_tables(thd,db,
				(lex->wild ? lex->wild->ptr() : NullS));
      break;
    }
#endif
2869 2870 2871
  case SQLCOM_SHOW_OPEN_TABLES:
    res= mysqld_show_open_tables(thd,(lex->wild ? lex->wild->ptr() : NullS));
    break;
2872 2873
  case SQLCOM_SHOW_CHARSETS:
    res= mysqld_show_charsets(thd,(lex->wild ? lex->wild->ptr() : NullS));
2874
    break;
2875 2876 2877
  case SQLCOM_SHOW_COLLATIONS:
    res= mysqld_show_collations(thd,(lex->wild ? lex->wild->ptr() : NullS));
    break;
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  case SQLCOM_SHOW_FIELDS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2880
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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    DBUG_VOID_RETURN;
#else
    {
2884 2885
      char *db=tables->db;
      if (!*db)
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      {
2887
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
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	goto error;				/* purecov: inspected */
      }
      remove_escape(db);			// Fix escaped '_'
2891
      remove_escape(tables->real_name);
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
      if (check_access(thd,SELECT_ACL | EXTRA_ACL,db,&thd->col_access,0,0))
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	goto error;				/* purecov: inspected */
      tables->grant.privilege=thd->col_access;
      if (grant_option && check_grant(thd,SELECT_ACL,tables,2))
	goto error;
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2898
#endif
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2899
      res= mysqld_show_fields(thd,tables,
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2900 2901
			      (lex->wild ? lex->wild->ptr() : NullS),
			      lex->verbose);
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2902 2903 2904 2905 2906
      break;
    }
#endif
  case SQLCOM_SHOW_KEYS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2907
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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2908 2909 2910
    DBUG_VOID_RETURN;
#else
    {
2911
      char *db=tables->db;
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2912 2913
      if (!db)
      {
2914
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
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2915 2916 2917
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);			// Fix escaped '_'
2918
      remove_escape(tables->real_name);
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2919 2920
      if (!tables->db)
	tables->db=thd->db;
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2921 2922
#ifndef NO_EMBEDDED_ACCESS_CHECKS
      if (check_access(thd,SELECT_ACL,db,&thd->col_access,0,0))
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2923 2924 2925 2926
	goto error; /* purecov: inspected */
      tables->grant.privilege=thd->col_access;
      if (grant_option && check_grant(thd,SELECT_ACL,tables,2))
	goto error;
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2927
#endif
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2928 2929 2930 2931 2932
      res= mysqld_show_keys(thd,tables);
      break;
    }
#endif
  case SQLCOM_CHANGE_DB:
2933
    mysql_change_db(thd,select_lex->db);
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2934
    break;
2935

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2936 2937
  case SQLCOM_LOAD:
  {
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2938
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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2939
    uint privilege= (lex->duplicates == DUP_REPLACE ?
2940
		     INSERT_ACL | DELETE_ACL : INSERT_ACL);
2941 2942

    if (!lex->local_file)
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2943
    {
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2944
      if (check_access(thd,privilege | FILE_ACL,tables->db,0,0,0))
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2945 2946 2947 2948
	goto error;
    }
    else
    {
2949
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
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2950
	  ! opt_local_infile)
2951
      {
2952
	send_error(thd,ER_NOT_ALLOWED_COMMAND);
2953 2954
	goto error;
      }
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2955
      if (check_access(thd,privilege,tables->db,&tables->grant.privilege,0,0) ||
2956
	  grant_option && check_grant(thd,privilege,tables))
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2957 2958
	goto error;
    }
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2959
#endif /*NO_EMBEDDED_ACCESS_CHECKS*/
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2960 2961 2962 2963
    res=mysql_load(thd, lex->exchange, tables, lex->field_list,
		   lex->duplicates, (bool) lex->local_file, lex->lock_option);
    break;
  }
2964

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2965
  case SQLCOM_SET_OPTION:
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2966
    if (tables && ((res= check_table_access(thd, SELECT_ACL, tables,0)) ||
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2967 2968 2969 2970
		   (res= open_and_lock_tables(thd,tables))))
      break;
    fix_tables_pointers(lex->all_selects_list);
    if (!(res= sql_set_variables(thd, &lex->var_list)))
2971
      send_ok(thd);
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2972 2973
    if (thd->net.report_error)
      res= -1;
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2974
    break;
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2975

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2976
  case SQLCOM_UNLOCK_TABLES:
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2977
    unlock_locked_tables(thd);
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2978 2979
    if (thd->options & OPTION_TABLE_LOCK)
    {
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2980
      end_active_trans(thd);
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2981
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
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2982 2983
    }
    if (thd->global_read_lock)
2984
      unlock_global_read_lock(thd);
2985
    send_ok(thd);
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2986 2987
    break;
  case SQLCOM_LOCK_TABLES:
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2988
    unlock_locked_tables(thd);
2989
    if (check_db_used(thd,tables) || end_active_trans(thd))
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2990
      goto error;
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2991
    if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, tables,0))
2992
      goto error;
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2993
    thd->in_lock_tables=1;
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2994
    thd->options|= OPTION_TABLE_LOCK;
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2995 2996 2997 2998
    if (!(res=open_and_lock_tables(thd,tables)))
    {
      thd->locked_tables=thd->lock;
      thd->lock=0;
2999
      send_ok(thd);
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3000
    }
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3001 3002
    else
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
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3003 3004 3005
    thd->in_lock_tables=0;
    break;
  case SQLCOM_CREATE_DB:
3006
  {
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3007
    if (!strip_sp(lex->name) || check_db_name(lex->name))
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3008
    {
3009
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
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3010 3011
      break;
    }
3012 3013 3014 3015 3016 3017 3018
    /*
      If in a slave thread :
      CREATE DATABASE DB was certainly not preceded by USE DB.
      For that reason, 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.
    */
3019
#ifdef HAVE_REPLICATION
3020 3021 3022
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
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3023 3024
    {
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
3025
      break;
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3026
    }
3027
#endif
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3028
    if (check_access(thd,CREATE_ACL,lex->name,0,1,0))
3029
      break;
3030
    res=mysql_create_db(thd,lex->name,&lex->create_info,0);
3031 3032
    break;
  }
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3033
  case SQLCOM_DROP_DB:
3034
  {
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3035
    if (!strip_sp(lex->name) || check_db_name(lex->name))
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3036
    {
3037
      net_printf(thd, ER_WRONG_DB_NAME, lex->name);
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3038 3039
      break;
    }
3040 3041 3042 3043 3044 3045 3046
    /*
      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.
    */
3047
#ifdef HAVE_REPLICATION
3048 3049 3050
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
unknown's avatar
unknown committed
3051 3052
    {
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
3053
      break;
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unknown committed
3054
    }
3055
#endif
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3056
    if (check_access(thd,DROP_ACL,lex->name,0,1,0))
3057
      break;
3058 3059
    if (thd->locked_tables || thd->active_transaction())
    {
3060
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
3061 3062
      goto error;
    }
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3063
    res=mysql_rm_db(thd,lex->name,lex->drop_if_exists,0);
3064 3065
    break;
  }
3066 3067 3068 3069
  case SQLCOM_ALTER_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
3070
      net_printf(thd, ER_WRONG_DB_NAME, lex->name);
3071 3072
      break;
    }
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3073
    if (check_access(thd,ALTER_ACL,lex->name,0,1,0))
3074 3075 3076
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
3077
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
3078 3079
      goto error;
    }
3080
    res=mysql_alter_db(thd,lex->name,&lex->create_info);
3081 3082
    break;
  }
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3083 3084 3085 3086
  case SQLCOM_SHOW_CREATE_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
3087
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
unknown's avatar
unknown committed
3088 3089
      break;
    }
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unknown committed
3090
    if (check_access(thd,DROP_ACL,lex->name,0,1,0))
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3091 3092 3093
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
3094
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
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3095 3096
      goto error;
    }
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3097
    res=mysqld_show_create_db(thd,lex->name,&lex->create_info);
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3098 3099
    break;
  }
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3100
  case SQLCOM_CREATE_FUNCTION:
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unknown committed
3101
    if (check_access(thd,INSERT_ACL,"mysql",0,1,0))
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3102 3103 3104
      break;
#ifdef HAVE_DLOPEN
    if (!(res = mysql_create_function(thd,&lex->udf)))
3105
      send_ok(thd);
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3106 3107 3108 3109 3110
#else
    res= -1;
#endif
    break;
  case SQLCOM_DROP_FUNCTION:
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unknown committed
3111
    if (check_access(thd,DELETE_ACL,"mysql",0,1,0))
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unknown committed
3112 3113
      break;
#ifdef HAVE_DLOPEN
3114
    if (!(res = mysql_drop_function(thd,&lex->udf.name)))
3115
      send_ok(thd);
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unknown committed
3116 3117 3118 3119
#else
    res= -1;
#endif
    break;
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3120
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3121 3122
  case SQLCOM_DROP_USER:
  {
unknown's avatar
unknown committed
3123
    if (check_access(thd, GRANT_ACL,"mysql",0,1,0))
3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138
      break;
    if (!(res= mysql_drop_user(thd, lex->users_list)))
    {
      mysql_update_log.write(thd, thd->query, thd->query_length);
      if (mysql_bin_log.is_open())
      {
	Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
	mysql_bin_log.write(&qinfo);
      }
      send_ok(thd);
    }
    break;
  }
  case SQLCOM_REVOKE_ALL:
  {
unknown's avatar
unknown committed
3139
    if (check_access(thd, GRANT_ACL ,"mysql",0,1,0))
3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152
      break;
    if (!(res = mysql_revoke_all(thd, lex->users_list)))
    {
      mysql_update_log.write(thd, thd->query, thd->query_length);
      if (mysql_bin_log.is_open())
      {
	Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
	mysql_bin_log.write(&qinfo);
      }
      send_ok(thd);
    }
    break;
  }
3153 3154 3155 3156 3157 3158
  case SQLCOM_REVOKE:
  case SQLCOM_GRANT:
  {
    if (check_access(thd, lex->grant | lex->grant_tot_col | GRANT_ACL,
		     tables && tables->db ? tables->db : select_lex->db,
		     tables ? &tables->grant.privilege : 0,
unknown's avatar
unknown committed
3159
		     tables ? 0 : 1,0))
3160 3161
      goto error;

unknown's avatar
unknown committed
3162 3163 3164 3165
    /*
      Check that the user isn't trying to change a password for another
      user if he doesn't have UPDATE privilege to the MySQL database
    */
3166 3167 3168 3169 3170 3171 3172 3173 3174 3175

    if (thd->user)				// If not replication
    {
      LEX_USER *user;
      List_iterator <LEX_USER> user_list(lex->users_list);
      while ((user=user_list++))
      {
	if (user->password.str &&
	    (strcmp(thd->user,user->user.str) ||
	     user->host.str &&
unknown's avatar
unknown committed
3176
	     my_strcasecmp(&my_charset_latin1,
3177
                           user->host.str, thd->host_or_ip)))
3178
	{
unknown's avatar
unknown committed
3179
	  if (check_access(thd, UPDATE_ACL, "mysql",0,1,0))
3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191
	    goto error;
	  break;			// We are allowed to do changes
	}
      }
    }
    if (tables)
    {
      if (grant_option && check_grant(thd,
				      (lex->grant | lex->grant_tot_col |
				       GRANT_ACL),
				      tables))
	goto error;
unknown's avatar
unknown committed
3192 3193 3194
      if (!(res = mysql_table_grant(thd,tables,lex->users_list, lex->columns,
				    lex->grant,
				    lex->sql_command == SQLCOM_REVOKE)))
3195
      {
3196
	mysql_update_log.write(thd, thd->query, thd->query_length);
3197 3198
	if (mysql_bin_log.is_open())
	{
3199
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
3200 3201 3202 3203 3204 3205 3206 3207
	  mysql_bin_log.write(&qinfo);
	}
      }
    }
    else
    {
      if (lex->columns.elements)
      {
3208
	send_error(thd,ER_ILLEGAL_GRANT_FOR_TABLE);
3209 3210 3211 3212 3213 3214 3215
	res=1;
      }
      else
	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
			  lex->sql_command == SQLCOM_REVOKE);
      if (!res)
      {
3216
	mysql_update_log.write(thd, thd->query, thd->query_length);
3217 3218
	if (mysql_bin_log.is_open())
	{
3219
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
3220 3221
	  mysql_bin_log.write(&qinfo);
	}
3222
	if (mqh_used && lex->sql_command == SQLCOM_GRANT)
3223
	{
unknown's avatar
unknown committed
3224 3225 3226
	  List_iterator <LEX_USER> str_list(lex->users_list);
	  LEX_USER *user;
	  while ((user=str_list++))
3227
	    reset_mqh(thd,user);
3228
	}
3229 3230 3231 3232
      }
    }
    break;
  }
unknown's avatar
SCRUM  
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3233
#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/
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3234
  case SQLCOM_RESET:
3235 3236 3237 3238 3239 3240 3241
    /* 
       RESET commands are never written to the binary log, so we have to
       initialize this variable because RESET shares the same code as FLUSH
    */
    lex->no_write_to_binlog= 1;
  case SQLCOM_FLUSH:
  {
unknown's avatar
unknown committed
3242
    if (check_global_access(thd,RELOAD_ACL) || check_db_used(thd, tables))
unknown's avatar
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3243
      goto error;
3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267
    /*
      reload_acl_and_cache() will tell us if we are allowed to write to the
      binlog or not.
    */
    bool write_to_binlog;
    if (reload_acl_and_cache(thd, lex->type, tables, &write_to_binlog))
      send_error(thd, 0);
    else
    {
      /*
        We WANT to write and we CAN write.
        ! we write after unlocking the table.
      */
      if (!lex->no_write_to_binlog && write_to_binlog)
      {
        mysql_update_log.write(thd, thd->query, thd->query_length);
        if (mysql_bin_log.is_open())
        {
          Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
          mysql_bin_log.write(&qinfo);
        }
      }
      send_ok(thd);
    }
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unknown committed
3268
    break;
3269
  }
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3270 3271 3272
  case SQLCOM_KILL:
    kill_one_thread(thd,lex->thread_id);
    break;
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unknown committed
3273
#ifndef NO_EMBEDDED_ACCESS_CHECKS
unknown's avatar
unknown committed
3274 3275
  case SQLCOM_SHOW_GRANTS:
    res=0;
3276 3277
    if ((thd->priv_user &&
	 !strcmp(thd->priv_user,lex->grant_user->user.str)) ||
unknown's avatar
unknown committed
3278
	!check_access(thd, SELECT_ACL, "mysql",0,1,0))
unknown's avatar
unknown committed
3279 3280 3281 3282
    {
      res = mysql_show_grants(thd,lex->grant_user);
    }
    break;
unknown's avatar
unknown committed
3283
#endif
3284
  case SQLCOM_HA_OPEN:
3285
    if (check_db_used(thd,tables) ||
unknown's avatar
unknown committed
3286
	check_table_access(thd,SELECT_ACL, tables,0))
3287 3288 3289 3290 3291 3292 3293 3294 3295
      goto error;
    res = mysql_ha_open(thd, tables);
    break;
  case SQLCOM_HA_CLOSE:
    if (check_db_used(thd,tables))
      goto error;
    res = mysql_ha_close(thd, tables);
    break;
  case SQLCOM_HA_READ:
3296 3297 3298 3299 3300
    /*
      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.
    */
unknown's avatar
unknown committed
3301
    if (check_db_used(thd,tables))
3302
      goto error;
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3303
    res = mysql_ha_read(thd, tables, lex->ha_read_mode, lex->backup_dir,
3304 3305
			lex->insert_list, lex->ha_rkey_mode, select_lex->where,
			select_lex->select_limit, select_lex->offset_limit);
3306 3307
    break;

unknown's avatar
unknown committed
3308
  case SQLCOM_BEGIN:
unknown's avatar
unknown committed
3309 3310 3311 3312 3313 3314
    if (thd->locked_tables)
    {
      thd->lock=thd->locked_tables;
      thd->locked_tables=0;			// Will be automaticly closed
      close_thread_tables(thd);			// Free tables
    }
unknown's avatar
unknown committed
3315 3316 3317 3318 3319 3320
    if (end_active_trans(thd))
    {
      res= -1;
    }
    else
    {
3321
      thd->options= ((thd->options & (ulong) ~(OPTION_STATUS_NO_TRANS_UPDATE)) |
unknown's avatar
unknown committed
3322 3323
		     OPTION_BEGIN);
      thd->server_status|= SERVER_STATUS_IN_TRANS;
3324
      send_ok(thd);
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unknown committed
3325
    }
unknown's avatar
unknown committed
3326 3327
    break;
  case SQLCOM_COMMIT:
3328 3329 3330 3331 3332
    /*
      We don't use end_active_trans() here to ensure that this works
      even if there is a problem with the OPTION_AUTO_COMMIT flag
      (Which of course should never happen...)
    */
unknown's avatar
unknown committed
3333
  {
3334
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
unknown's avatar
unknown committed
3335 3336
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    if (!ha_commit(thd))
unknown's avatar
unknown committed
3337
    {
3338
      send_ok(thd);
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unknown committed
3339
    }
unknown's avatar
unknown committed
3340 3341 3342
    else
      res= -1;
    break;
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unknown committed
3343
  }
unknown's avatar
unknown committed
3344 3345 3346
  case SQLCOM_ROLLBACK:
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    if (!ha_rollback(thd))
3347
    {
unknown's avatar
unknown committed
3348 3349 3350 3351 3352 3353 3354 3355 3356 3357
      /*
        If a non-transactional table was updated, warn; don't warn if this is a
        slave thread (because when a slave thread executes a ROLLBACK, it has
        been read from the binary log, so it's 100% sure and normal to produce
        error ER_WARNING_NOT_COMPLETE_ROLLBACK. If we sent the warning to the
        slave SQL thread, it would not stop the thread but just be printed in
        the error log; but we don't want users to wonder why they have this
        message in the error log, so we don't send it.
      */
      if ((thd->options & OPTION_STATUS_NO_TRANS_UPDATE) && !thd->slave_thread)
3358
	send_warning(thd,ER_WARNING_NOT_COMPLETE_ROLLBACK,0);
3359
      else
3360
	send_ok(thd);
3361
    }
unknown's avatar
unknown committed
3362 3363
    else
      res= -1;
3364
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
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unknown committed
3365
    break;
unknown's avatar
unknown committed
3366 3367 3368
  case SQLCOM_ROLLBACK_TO_SAVEPOINT:
    if (!ha_rollback_to_savepoint(thd, lex->savepoint_name))
    {
unknown's avatar
unknown committed
3369
      if ((thd->options & OPTION_STATUS_NO_TRANS_UPDATE) && !thd->slave_thread)
unknown's avatar
unknown committed
3370
	send_warning(thd, ER_WARNING_NOT_COMPLETE_ROLLBACK, 0);
unknown's avatar
unknown committed
3371
      else
unknown's avatar
unknown committed
3372
	send_ok(thd);
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unknown committed
3373 3374 3375 3376
    }
    else
      res= -1;
    break;
3377
  case SQLCOM_SAVEPOINT:
unknown's avatar
unknown committed
3378
    if (!ha_savepoint(thd, lex->savepoint_name))
unknown's avatar
unknown committed
3379
      send_ok(thd);
unknown's avatar
unknown committed
3380 3381
    else
      res= -1;
3382
    break;
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  default:					/* Impossible */
3384
    send_ok(thd);
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    break;
  }
  thd->proc_info="query end";			// QQ
  if (res < 0)
3389
    send_error(thd,thd->killed ? ER_SERVER_SHUTDOWN : 0);
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error:
  DBUG_VOID_RETURN;
}


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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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/*
  Check grants for commands which work only with one table and all other
  tables belong to subselects.

3401
  SYNOPSIS
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    single_table_command_access()
    thd - Thread handler
    privilege - asked privelage
    tables - table list of command
    res - pointer on result code variable

  RETURN
    0 - OK
    1 - access denied
*/

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static bool single_table_command_access(THD *thd, ulong privilege,
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					TABLE_LIST *tables, int *res)
					 
{
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    if (check_access(thd, privilege, tables->db, &tables->grant.privilege,0,0))
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      return 1;

    // Show only 1 table for check_grant
    TABLE_LIST *subselects_tables= tables->next;
    tables->next= 0;
    if (grant_option && check_grant(thd,  privilege, tables))
      return 1;

    // check rights on tables of subselect (if exists)
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    if (subselects_tables)
    {
      tables->next= subselects_tables;
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      if ((*res= check_table_access(thd, SELECT_ACL, subselects_tables,0)))
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	return 1;
    }
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    return 0;
}


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/****************************************************************************
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  Get the user (global) and database privileges for all used tables
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  NOTES
    The idea of EXTRA_ACL is that one will be granted access to the table if
    one has the asked privilege on any column combination of the table; For
    example to be able to check a table one needs to have SELECT privilege on
    any column of the table.

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

    save_priv	In this we store global and db level grants for the table
		Note that we don't store db level grants if the global grants
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                is enough to satisfy the request and the global grants contains
                a SELECT grant.
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****************************************************************************/

bool
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check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
3458
	     bool dont_check_global_grants, bool no_errors)
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{
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  DBUG_ENTER("check_access");
  DBUG_PRINT("enter",("want_access: %lu  master_access: %lu", want_access,
		      thd->master_access));
  ulong db_access,dummy;
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  if (save_priv)
    *save_priv=0;
  else
    save_priv= &dummy;

3469
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
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  {
3471
    if (!no_errors)
3472
      send_error(thd,ER_NO_DB_ERROR);	/* purecov: tested */
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    DBUG_RETURN(TRUE);				/* purecov: tested */
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  }

  if ((thd->master_access & want_access) == want_access)
  {
3478 3479 3480 3481 3482 3483 3484 3485
    /*
      If we don't have a global SELECT privilege, we have to get the database
      specific access rights to be able to handle queries of type
      UPDATE t1 SET a=1 WHERE b > 0
    */
    db_access= thd->db_access;
    if (!(thd->master_access & SELECT_ACL) &&
	(db && (!thd->db || strcmp(db,thd->db))))
3486
      db_access=acl_get(thd->host, thd->ip,
3487
			thd->priv_user, db, test(want_access & GRANT_ACL));
3488
    *save_priv=thd->master_access | db_access;
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    DBUG_RETURN(FALSE);
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  }
3491
  if (((want_access & ~thd->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
3492
      ! db && dont_check_global_grants)
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  {						// We can never grant this
3494
    if (!no_errors)
3495
      net_printf(thd,ER_ACCESS_DENIED_ERROR,
3496
		 thd->priv_user,
3497
		 thd->priv_host,
3498
		 thd->password ? ER(ER_YES) : ER(ER_NO));/* purecov: tested */
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    DBUG_RETURN(TRUE);				/* purecov: tested */
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  }

  if (db == any_db)
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    DBUG_RETURN(FALSE);				// Allow select on anything
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  if (db && (!thd->db || strcmp(db,thd->db)))
3506
    db_access=acl_get(thd->host, thd->ip,
3507
		      thd->priv_user, db, test(want_access & GRANT_ACL));
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  else
    db_access=thd->db_access;
3510 3511
  // Remove SHOW attribute and access rights we already have
  want_access &= ~(thd->master_access | EXTRA_ACL);
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  db_access= ((*save_priv=(db_access | thd->master_access)) & want_access);
3513 3514

  /* grant_option is set if there exists a single table or column grant */
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  if (db_access == want_access ||
3516
      ((grant_option && !dont_check_global_grants) &&
3517
       !(want_access & ~(db_access | TABLE_ACLS))))
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    DBUG_RETURN(FALSE);				/* Ok */
3519
  if (!no_errors)
3520
    net_printf(thd,ER_DBACCESS_DENIED_ERROR,
3521
	       thd->priv_user,
3522
	       thd->priv_host,
3523
	       db ? db : thd->db ? thd->db : "unknown"); /* purecov: tested */
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  DBUG_RETURN(TRUE);				/* purecov: tested */
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}


3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545
/*
  check for global access and give descriptive error message if it fails

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

  WARNING
    One gets access rigth 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.

  RETURN
    0	ok
    1	Access denied.  In this case an error is sent to the client
*/
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bool check_global_access(THD *thd, ulong want_access)
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{
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  char command[128];
3550
  if ((thd->master_access & want_access))
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    return 0;
  get_privilege_desc(command, sizeof(command), want_access);
3553
  net_printf(thd,ER_SPECIFIC_ACCESS_DENIED_ERROR,
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	     command);
  return 1;
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}


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/*
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  Check the privilege for all used tables.  Table privileges are cached
  in the table list for GRANT checking
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*/

3564
bool
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check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
3566
		   bool no_errors)
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{
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  uint found=0;
  ulong found_access=0;
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  TABLE_LIST *org_tables=tables;
  for (; tables ; tables=tables->next)
  {
3573
    if (tables->derived || (tables->table && (int)tables->table->tmp_table))
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      continue;
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    if ((thd->master_access & want_access) == (want_access & ~EXTRA_ACL) &&
	thd->db)
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      tables->grant.privilege= want_access;
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    else if (tables->db && tables->db == thd->db)
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    {
      if (found && !grant_option)		// db already checked
	tables->grant.privilege=found_access;
      else
      {
3584 3585
	if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
			 0, no_errors))
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	  return TRUE;				// Access denied
	found_access=tables->grant.privilege;
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	found=1;
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      }
    }
3591
    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
3592
			  0, no_errors))
3593
      return TRUE;
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  }
  if (grant_option)
3596
    return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
3597
		       test(want_access & EXTRA_ACL), no_errors);
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  return FALSE;
}

3601 3602
static bool check_merge_table_access(THD *thd, char *db,
				     TABLE_LIST *table_list)
3603 3604 3605 3606
{
  int error=0;
  if (table_list)
  {
3607
    /* Check that all tables use the current database */
3608 3609
    TABLE_LIST *tmp;
    for (tmp=table_list; tmp ; tmp=tmp->next)
3610 3611 3612 3613
    {
      if (!tmp->db || !tmp->db[0])
	tmp->db=db;
    }
3614
    error=check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
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			     table_list,0);
3616 3617 3618 3619
  }
  return error;
}

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#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/

static bool check_db_used(THD *thd,TABLE_LIST *tables)
{
  for (; tables ; tables=tables->next)
  {
    if (!tables->db)
    {
      if (!(tables->db=thd->db))
      {
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: tested */
	return TRUE;				/* purecov: tested */
      }
    }
  }
  return FALSE;
}
3637

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

#if STACK_DIRECTION < 0
#define used_stack(A,B) (long) (A - B)
#else
#define used_stack(A,B) (long) (B - A)
#endif

3648
#ifndef EMBEDDED_LIBRARY
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bool check_stack_overrun(THD *thd,char *buf __attribute__((unused)))
{
  long stack_used;
  if ((stack_used=used_stack(thd->thread_stack,(char*) &stack_used)) >=
      (long) thread_stack_min)
  {
    sprintf(errbuff[0],ER(ER_STACK_OVERRUN),stack_used,thread_stack);
    my_message(ER_STACK_OVERRUN,errbuff[0],MYF(0));
3657
    thd->fatal_error();
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    return 1;
  }
  return 0;
}
3662
#endif /* EMBEDDED_LIBRARY */
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#define MY_YACC_INIT 1000			// Start with big alloc
#define MY_YACC_MAX  32000			// Because of 'short'

bool my_yyoverflow(short **yyss, YYSTYPE **yyvs, int *yystacksize)
{
  LEX	*lex=current_lex;
  int  old_info=0;
  if ((uint) *yystacksize >= MY_YACC_MAX)
    return 1;
  if (!lex->yacc_yyvs)
    old_info= *yystacksize;
  *yystacksize= set_zone((*yystacksize)*2,MY_YACC_INIT,MY_YACC_MAX);
  if (!(lex->yacc_yyvs= (char*)
	my_realloc((gptr) lex->yacc_yyvs,
		   *yystacksize*sizeof(**yyvs),
		   MYF(MY_ALLOW_ZERO_PTR | MY_FREE_ON_ERROR))) ||
      !(lex->yacc_yyss= (char*)
	my_realloc((gptr) lex->yacc_yyss,
		   *yystacksize*sizeof(**yyss),
		   MYF(MY_ALLOW_ZERO_PTR | MY_FREE_ON_ERROR))))
    return 1;
  if (old_info)
  {						// Copy old info from stack
    memcpy(lex->yacc_yyss, (gptr) *yyss, old_info*sizeof(**yyss));
    memcpy(lex->yacc_yyvs, (gptr) *yyvs, old_info*sizeof(**yyvs));
  }
  *yyss=(short*) lex->yacc_yyss;
  *yyvs=(YYSTYPE*) lex->yacc_yyvs;
  return 0;
}


/****************************************************************************
3697
  Initialize global thd variables needed for query
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****************************************************************************/

3700
void
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mysql_init_query(THD *thd)
{
  DBUG_ENTER("mysql_init_query");
3704 3705 3706
  LEX *lex=&thd->lex;
  lex->unit.init_query();
  lex->unit.init_select();
3707
  lex->unit.thd= thd;
3708 3709 3710
  lex->select_lex.init_query();
  lex->value_list.empty();
  lex->param_list.empty();
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  lex->unit.next= lex->unit.master= 
    lex->unit.link_next= lex->unit.return_to=0;
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  lex->unit.prev= lex->unit.link_prev= 0;
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  lex->unit.slave= lex->unit.global_parameters= lex->current_select=
3715
    lex->all_selects_list= &lex->select_lex;
3716 3717
  lex->select_lex.master= &lex->unit;
  lex->select_lex.prev= &lex->unit.slave;
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  lex->select_lex.link_next= lex->select_lex.slave= lex->select_lex.next= 0;
3719
  lex->select_lex.link_prev= (st_select_lex_node**)&(lex->all_selects_list);
3720 3721
  lex->describe= 0;
  lex->derived_tables= FALSE;
3722 3723
  lex->lock_option= TL_READ;
  lex->found_colon= 0;
3724
  lex->safe_to_cache_query= 1;
3725
  thd->select_number= lex->select_lex.select_number= 1;
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  thd->free_list= 0;
3727
  thd->total_warn_count=0;			// Warnings for this query
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  thd->last_insert_id_used= thd->query_start_used= thd->insert_id_used=0;
  thd->sent_row_count= thd->examined_row_count= 0;
3730
  thd->is_fatal_error= thd->rand_used= 0;
3731
  thd->server_status &= ~SERVER_MORE_RESULTS_EXISTS;
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  thd->tmp_table_used= 0;
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  if (opt_bin_log)
    reset_dynamic(&thd->user_var_events);
3735
  thd->clear_error();
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  DBUG_VOID_RETURN;
}

3739

3740 3741 3742
void
mysql_init_select(LEX *lex)
{
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  SELECT_LEX *select_lex= lex->current_select;
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  select_lex->init_select();
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  select_lex->select_limit= lex->thd->variables.select_limit;
3746 3747 3748 3749 3750 3751
  if (select_lex == &lex->select_lex)
  {
    lex->exchange= 0;
    lex->result= 0;
    lex->proc_list.first= 0;
  }
3752 3753
}

3754

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bool
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mysql_new_select(LEX *lex, bool move_down)
3757
{
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  SELECT_LEX *select_lex = new(&lex->thd->mem_root) SELECT_LEX();
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  if (!select_lex)
    return 1;
3761
  select_lex->select_number= ++lex->thd->select_number;
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  select_lex->init_query();
  select_lex->init_select();
  if (move_down)
  {
    /* first select_lex of subselect or derived table */
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    SELECT_LEX_UNIT *unit= new(&lex->thd->mem_root) SELECT_LEX_UNIT();
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    if (!unit)
      return 1;
    unit->init_query();
    unit->init_select();
3772
    unit->thd= lex->thd;
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    unit->include_down(lex->current_select);
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    unit->link_next= 0;
    unit->link_prev= 0;
3776
    unit->return_to= lex->current_select;
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    select_lex->include_down(unit);
3778
    // TODO: assign resolve_mode for fake subquery after merging with new tree
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  }
  else
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  {
3782
    select_lex->include_neighbour(lex->current_select);
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    SELECT_LEX_UNIT *unit= select_lex->master_unit();
    SELECT_LEX *fake= unit->fake_select_lex;
    if (!fake)
    {
      /*
	as far as we included SELECT_LEX for UNION unit should have
	fake SELECT_LEX for UNION processing
      */
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      fake= unit->fake_select_lex= new(&lex->thd->mem_root) SELECT_LEX();
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      fake->include_standalone(unit,
			       (SELECT_LEX_NODE**)&unit->fake_select_lex);
      fake->select_number= INT_MAX;
      fake->make_empty_select();
      fake->linkage= GLOBAL_OPTIONS_TYPE;
      fake->select_limit= lex->thd->variables.select_limit;
    }
  }
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3800

3801
  select_lex->master_unit()->global_parameters= select_lex;
3802
  select_lex->include_global((st_select_lex_node**)&lex->all_selects_list);
3803
  lex->current_select= select_lex;
3804
  select_lex->resolve_mode= SELECT_LEX::SELECT_MODE;
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  return 0;
3806
}
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3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822
/*
  Create a select to return the same output as 'SELECT @@var_name'.

  SYNOPSIS
    create_select_for_variable()
    var_name		Variable name

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

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

void create_select_for_variable(const char *var_name)
{
3823
  THD *thd;
3824
  LEX *lex;
3825
  LEX_STRING tmp, null_lex_string;
3826
  DBUG_ENTER("create_select_for_variable");
3827 3828 3829

  thd= current_thd;
  lex= &thd->lex;
3830 3831 3832 3833
  mysql_init_select(lex);
  lex->sql_command= SQLCOM_SELECT;
  tmp.str= (char*) var_name;
  tmp.length=strlen(var_name);
3834 3835 3836
  bzero((char*) &null_lex_string.str, sizeof(null_lex_string));
  add_item_to_list(thd, get_system_var(thd, OPT_SESSION, tmp,
				       null_lex_string));
3837 3838 3839
  DBUG_VOID_RETURN;
}

3840

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void mysql_init_multi_delete(LEX *lex)
{
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  lex->sql_command=  SQLCOM_DELETE_MULTI;
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  mysql_init_select(lex);
3845
  lex->select_lex.select_limit= lex->unit.select_limit_cnt=
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    HA_POS_ERROR;
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  lex->select_lex.table_list.save_and_clear(&lex->auxilliary_table_list);
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}
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3849

3850

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3851
void
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mysql_parse(THD *thd, char *inBuf, uint length)
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{
  DBUG_ENTER("mysql_parse");

  mysql_init_query(thd);
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  if (query_cache_send_result_to_client(thd, inBuf, length) <= 0)
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  {
    LEX *lex=lex_start(thd, (uchar*) inBuf, length);
3860
    if (!yyparse((void *)thd) && ! thd->is_fatal_error)
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    {
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
3863
      if (mqh_used && thd->user_connect &&
3864
	  check_mqh(thd, lex->sql_command))
3865 3866 3867 3868
      {
	thd->net.error = 0;
      }
      else
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#endif
3870
      {
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	if (thd->net.report_error)
	  send_error(thd, 0, NullS);
	else
	{
	  mysql_execute_command(thd);
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3876
#ifndef EMBEDDED_LIBRARY  /* TODO query cache in embedded library*/
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	  query_cache_end_of_result(&thd->net);
3878
#endif
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	}
3880
      }
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    }
    else
3883 3884
    {
      DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
3885
			 thd->is_fatal_error));
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#ifndef EMBEDDED_LIBRARY   /* TODO query cache in embedded library*/
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      query_cache_abort(&thd->net);
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#endif
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    }
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    thd->proc_info="freeing items";
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    free_items(thd->free_list);  /* Free strings used by items */
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    lex_end(lex);
  }
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  DBUG_VOID_RETURN;
}


/*****************************************************************************
** Store field definition for create
** Return 0 if ok
******************************************************************************/

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bool add_field_to_list(THD *thd, char *field_name, enum_field_types type,
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		       char *length, char *decimals,
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		       uint type_modifier,
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		       Item *default_value, LEX_STRING *comment,
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		       char *change, TYPELIB *interval, CHARSET_INFO *cs,
		       uint uint_geom_type)
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{
  register create_field *new_field;
  LEX  *lex= &thd->lex;
  uint allowed_type_modifier=0;
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  char warn_buff[MYSQL_ERRMSG_SIZE];
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  DBUG_ENTER("add_field_to_list");

  if (strlen(field_name) > NAME_LEN)
  {
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    net_printf(thd, ER_TOO_LONG_IDENT, field_name); /* purecov: inspected */
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    DBUG_RETURN(1);				/* purecov: inspected */
  }
  if (type_modifier & PRI_KEY_FLAG)
  {
    lex->col_list.push_back(new key_part_spec(field_name,0));
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    lex->key_list.push_back(new Key(Key::PRIMARY, NullS, HA_KEY_ALG_UNDEF,
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				    lex->col_list));
    lex->col_list.empty();
  }
  if (type_modifier & (UNIQUE_FLAG | UNIQUE_KEY_FLAG))
  {
    lex->col_list.push_back(new key_part_spec(field_name,0));
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    lex->key_list.push_back(new Key(Key::UNIQUE, NullS, HA_KEY_ALG_UNDEF,
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				    lex->col_list));
    lex->col_list.empty();
  }

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  if (default_value)
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  {
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    if (default_value->type() == Item::NULL_ITEM)
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    {
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      default_value=0;
      if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) ==
	  NOT_NULL_FLAG)
      {
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	net_printf(thd,ER_INVALID_DEFAULT,field_name);
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	DBUG_RETURN(1);
      }
    }
    else if (type_modifier & AUTO_INCREMENT_FLAG)
    {
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      net_printf(thd, ER_INVALID_DEFAULT, field_name);
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      DBUG_RETURN(1);
    }
  }
  if (!(new_field=new create_field()))
    DBUG_RETURN(1);
  new_field->field=0;
  new_field->field_name=field_name;
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  new_field->def= default_value;
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  new_field->flags= type_modifier;
  new_field->unireg_check= (type_modifier & AUTO_INCREMENT_FLAG ?
			    Field::NEXT_NUMBER : Field::NONE);
  new_field->decimals= decimals ? (uint) set_zone(atoi(decimals),0,
						  NOT_FIXED_DEC-1) : 0;
  new_field->sql_type=type;
  new_field->length=0;
  new_field->change=change;
  new_field->interval=0;
  new_field->pack_length=0;
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  new_field->charset=cs;
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  new_field->geom_type= (Field::geometry_type) uint_geom_type;
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  if (!comment)
  {
    new_field->comment.str=0;
    new_field->comment.length=0;
  }
  else
  {
    /* In this case comment is always of type Item_string */
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    new_field->comment.str=   (char*) comment->str;
    new_field->comment.length=comment->length;
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  }
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  if (length && !(new_field->length= (uint) atoi(length)))
    length=0; /* purecov: inspected */
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  uint sign_len=type_modifier & UNSIGNED_FLAG ? 0 : 1;

  if (new_field->length && new_field->decimals &&
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      new_field->length < new_field->decimals+1 &&
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      new_field->decimals != NOT_FIXED_DEC)
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    new_field->length=new_field->decimals+1; /* purecov: inspected */
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  switch (type) {
  case FIELD_TYPE_TINY:
    if (!length) new_field->length=3+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_SHORT:
    if (!length) new_field->length=5+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_INT24:
    if (!length) new_field->length=8+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_LONG:
    if (!length) new_field->length=10+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_LONGLONG:
    if (!length) new_field->length=20;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_NULL:
    break;
  case FIELD_TYPE_DECIMAL:
    if (!length)
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      new_field->length= 10;			// Default length for DECIMAL
    if (new_field->length < MAX_FIELD_WIDTH)	// Skip wrong argument
    {
      new_field->length+=sign_len;
      if (new_field->decimals)
	new_field->length++;
    }
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    break;
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  case FIELD_TYPE_STRING:
  case FIELD_TYPE_VAR_STRING:
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    if (new_field->length <= MAX_FIELD_CHARLENGTH || default_value)
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      break;
    /* Convert long CHAR() and VARCHAR columns to TEXT or BLOB */
    new_field->sql_type= FIELD_TYPE_BLOB;
    sprintf(warn_buff, ER(ER_AUTO_CONVERT), field_name, "CHAR",
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	    (cs == &my_charset_bin) ? "BLOB" : "TEXT");
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    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_AUTO_CONVERT,
		 warn_buff);
    /* fall through */
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  case FIELD_TYPE_BLOB:
  case FIELD_TYPE_TINY_BLOB:
  case FIELD_TYPE_LONG_BLOB:
  case FIELD_TYPE_MEDIUM_BLOB:
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  case FIELD_TYPE_GEOMETRY:
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    if (new_field->length)
    {
      /* The user has given a length to the blob column */
      if (new_field->length < 256)
	type= FIELD_TYPE_TINY_BLOB;
      if (new_field->length < 65536)
	type= FIELD_TYPE_BLOB;
      else if (new_field->length < 256L*256L*256L)
	type= FIELD_TYPE_MEDIUM_BLOB;
      else
	type= FIELD_TYPE_LONG_BLOB;
      new_field->length= 0;
    }
    new_field->sql_type= type;
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    if (default_value)				// Allow empty as default value
    {
      String str,*res;
      res=default_value->val_str(&str);
      if (res->length())
      {
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	net_printf(thd,ER_BLOB_CANT_HAVE_DEFAULT,field_name); /* purecov: inspected */
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	DBUG_RETURN(1); /* purecov: inspected */
      }
      new_field->def=0;
    }
    new_field->flags|=BLOB_FLAG;
    break;
  case FIELD_TYPE_YEAR:
    if (!length || new_field->length != 2)
      new_field->length=4;			// Default length
    new_field->flags|= ZEROFILL_FLAG | UNSIGNED_FLAG;
    break;
  case FIELD_TYPE_FLOAT:
    /* change FLOAT(precision) to FLOAT or DOUBLE */
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    if (length && !decimals)
    {
      uint tmp_length=new_field->length;
      if (tmp_length > PRECISION_FOR_DOUBLE)
      {
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	net_printf(thd,ER_WRONG_FIELD_SPEC,field_name);
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	DBUG_RETURN(1);
      }
      else if (tmp_length > PRECISION_FOR_FLOAT)
      {
	new_field->sql_type=FIELD_TYPE_DOUBLE;
	new_field->length=DBL_DIG+7;			// -[digits].E+###
      }
      else
	new_field->length=FLT_DIG+6;			// -[digits].E+##
      new_field->decimals= NOT_FIXED_DEC;
      break;
    }
    if (!length)
    {
      new_field->length =  FLT_DIG+6;
      new_field->decimals= NOT_FIXED_DEC;
    }
    break;
  case FIELD_TYPE_DOUBLE:
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    if (!length)
    {
      new_field->length = DBL_DIG+7;
      new_field->decimals=NOT_FIXED_DEC;
    }
    break;
  case FIELD_TYPE_TIMESTAMP:
    if (!length)
      new_field->length= 14;			// Full date YYYYMMDDHHMMSS
    else
    {
      new_field->length=((new_field->length+1)/2)*2; /* purecov: inspected */
      new_field->length= min(new_field->length,14); /* purecov: inspected */
    }
    new_field->flags|= ZEROFILL_FLAG | UNSIGNED_FLAG | NOT_NULL_FLAG;
    break;
  case FIELD_TYPE_DATE:				// Old date type
    if (protocol_version != PROTOCOL_VERSION-1)
      new_field->sql_type=FIELD_TYPE_NEWDATE;
    /* fall trough */
  case FIELD_TYPE_NEWDATE:
    new_field->length=10;
    break;
  case FIELD_TYPE_TIME:
    new_field->length=10;
    break;
  case FIELD_TYPE_DATETIME:
    new_field->length=19;
    break;
  case FIELD_TYPE_SET:
    {
      if (interval->count > sizeof(longlong)*8)
      {
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	net_printf(thd,ER_TOO_BIG_SET,field_name); /* purecov: inspected */
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	DBUG_RETURN(1);				/* purecov: inspected */
      }
      new_field->pack_length=(interval->count+7)/8;
      if (new_field->pack_length > 4)
	new_field->pack_length=8;
      new_field->interval=interval;
      new_field->length=0;
      for (const char **pos=interval->type_names; *pos ; pos++)
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      {
	new_field->length+=(uint) strip_sp((char*) *pos)+1;
      }
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      new_field->length--;
      set_if_smaller(new_field->length,MAX_FIELD_WIDTH-1);
      if (default_value)
      {
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	char *not_used;
	uint not_used2;
4153
	bool not_used3;
4154

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	thd->cuted_fields=0;
	String str,*res;
	res=default_value->val_str(&str);
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	(void) find_set(interval, res->ptr(), res->length(), &not_used,
4159
			&not_used2, &not_used3);
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	if (thd->cuted_fields)
	{
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	  net_printf(thd,ER_INVALID_DEFAULT,field_name);
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	  DBUG_RETURN(1);
	}
      }
    }
    break;
  case FIELD_TYPE_ENUM:
    {
      new_field->interval=interval;
      new_field->pack_length=interval->count < 256 ? 1 : 2; // Should be safe
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      new_field->length=(uint) strip_sp((char*) interval->type_names[0]);
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      for (const char **pos=interval->type_names+1; *pos ; pos++)
      {
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	uint length=(uint) strip_sp((char*) *pos);
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	set_if_bigger(new_field->length,length);
      }
      set_if_smaller(new_field->length,MAX_FIELD_WIDTH-1);
      if (default_value)
      {
	String str,*res;
	res=default_value->val_str(&str);
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	res->strip_sp();
	if (!find_type(interval, res->ptr(), res->length(), 0))
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	{
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	  net_printf(thd,ER_INVALID_DEFAULT,field_name);
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	  DBUG_RETURN(1);
	}
      }
      break;
    }
  }

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  if ((new_field->length > MAX_FIELD_CHARLENGTH && type != FIELD_TYPE_SET && 
       type != FIELD_TYPE_ENUM) ||
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      (!new_field->length && !(new_field->flags & BLOB_FLAG) &&
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       type != FIELD_TYPE_STRING &&
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       type != FIELD_TYPE_VAR_STRING && type != FIELD_TYPE_GEOMETRY))
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  {
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    net_printf(thd,ER_TOO_BIG_FIELDLENGTH,field_name,
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	       MAX_FIELD_CHARLENGTH);		/* purecov: inspected */
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    DBUG_RETURN(1);				/* purecov: inspected */
  }
  type_modifier&= AUTO_INCREMENT_FLAG;
  if ((~allowed_type_modifier) & type_modifier)
  {
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    net_printf(thd,ER_WRONG_FIELD_SPEC,field_name);
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    DBUG_RETURN(1);
  }
  if (!new_field->pack_length)
    new_field->pack_length=calc_pack_length(new_field->sql_type ==
					    FIELD_TYPE_VAR_STRING ?
					    FIELD_TYPE_STRING :
					    new_field->sql_type,
					    new_field->length);
  lex->create_list.push_back(new_field);
  lex->last_field=new_field;
  DBUG_RETURN(0);
}

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

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

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

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


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

static void remove_escape(char *name)
{
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  if (!*name)					// For empty DB names
    return;
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  char *to;
#ifdef USE_MB
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  char *strend=name+(uint) strlen(name);
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#endif
  for (to=name; *name ; name++)
  {
#ifdef USE_MB
    int l;
/*    if ((l = ismbchar(name, name+MBMAXLEN))) { Wei He: I think it's wrong */
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    if (use_mb(system_charset_info) &&
        (l = my_ismbchar(system_charset_info, name, strend)))
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    {
	while (l--)
	    *to++ = *name++;
	name--;
	continue;
    }
#endif
    if (*name == '\\' && name[1])
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      name++;					// Skip '\\'
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    *to++= *name;
  }
  *to=0;
}

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


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


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/*
  Add a table to list of used tables

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

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

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TABLE_LIST *st_select_lex::add_table_to_list(THD *thd,
					     Table_ident *table,
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					     LEX_STRING *alias,
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					     ulong table_options,
					     thr_lock_type lock_type,
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					     List<String> *use_index,
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					     List<String> *ignore_index,
                                             LEX_STRING *option)
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{
  register TABLE_LIST *ptr;
  char *alias_str;
  DBUG_ENTER("add_table_to_list");

  if (!table)
    DBUG_RETURN(0);				// End of memory
  alias_str= alias ? alias->str : table->table.str;
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  if (check_table_name(table->table.str,table->table.length) ||
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      table->db.str && check_db_name(table->db.str))
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  {
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    net_printf(thd, ER_WRONG_TABLE_NAME, table->table.str);
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    DBUG_RETURN(0);
  }

  if (!alias)					/* Alias is case sensitive */
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  {
    if (table->sel)
    {
      net_printf(thd,ER_DERIVED_MUST_HAVE_ALIAS);
      DBUG_RETURN(0);
    }
4348
    if (!(alias_str=thd->memdup(alias_str,table->table.length+1)))
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      DBUG_RETURN(0);
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  }
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  if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
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    DBUG_RETURN(0);				/* purecov: inspected */
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  if (table->db.str)
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  {
    ptr->db= table->db.str;
    ptr->db_length= table->db.length;
  }
  else if (thd->db)
  {
    ptr->db= thd->db;
    ptr->db_length= thd->db_length;
  }
  else
  {
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    /* The following can't be "" as we may do 'casedn_str()' on it */
    ptr->db= empty_c_string;
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    ptr->db_length= 0;
  }
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  ptr->alias= alias_str;
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  if (lower_case_table_names && table->table.length)
    my_casedn_str(files_charset_info, table->table.str);
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  ptr->real_name=table->table.str;
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  ptr->real_name_length=table->table.length;
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  ptr->lock_type=   lock_type;
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  ptr->updating=    test(table_options & TL_OPTION_UPDATING);
  ptr->force_index= test(table_options & TL_OPTION_FORCE_INDEX);
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  ptr->ignore_leaves= test(table_options & TL_OPTION_IGNORE_LEAVES);
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  ptr->derived=	    table->sel;
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  if (use_index)
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    ptr->use_index=(List<String> *) thd->memdup((gptr) use_index,
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					       sizeof(*use_index));
  if (ignore_index)
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    ptr->ignore_index=(List<String> *) thd->memdup((gptr) ignore_index,
						   sizeof(*ignore_index));
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  ptr->option= option ? option->str : 0;
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  /* check that used name is unique */
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  if (lock_type != TL_IGNORE)
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  {
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    for (TABLE_LIST *tables=(TABLE_LIST*) table_list.first ;
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	 tables ;
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	 tables=tables->next)
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    {
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      if (!strcmp(alias_str,tables->alias) && !strcmp(ptr->db, tables->db))
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      {
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	net_printf(thd,ER_NONUNIQ_TABLE,alias_str); /* purecov: tested */
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	DBUG_RETURN(0);				/* purecov: tested */
      }
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    }
  }
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  table_list.link_in_list((byte*) ptr, (byte**) &ptr->next);
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  DBUG_RETURN(ptr);
}

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/*
  Set lock for all tables in current select level

  SYNOPSIS:
    set_lock_for_tables()
    lock_type			Lock to set for tables

  NOTE:
    If lock is a write lock, then tables->updating is set 1
    This is to get tables_ok to know that the table is updated by the
    query
*/

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void st_select_lex::set_lock_for_tables(thr_lock_type lock_type)
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{
  bool for_update= lock_type >= TL_READ_NO_INSERT;
  DBUG_ENTER("set_lock_for_tables");
  DBUG_PRINT("enter", ("lock_type: %d  for_update: %d", lock_type,
		       for_update));

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

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void add_join_on(TABLE_LIST *b,Item *expr)
{
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  if (expr)
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  {
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    if (!b->on_expr)
      b->on_expr=expr;
    else
    {
      // This only happens if you have both a right and left join
      b->on_expr=new Item_cond_and(b->on_expr,expr);
    }
    b->on_expr->top_level_item();
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  }
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}


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/*
  Mark that we have a NATURAL JOIN between two tables

  SYNOPSIS
    add_join_natural()
    a			Table to do normal join with
    b			Do normal join with this table
  
  IMPLEMENTATION
    This function just marks that table b should be joined with a.
    The function setup_cond() will create in b->on_expr a list
    of equal condition between all fields of the same name.

    SELECT * FROM t1 NATURAL LEFT JOIN t2
     <=>
    SELECT * FROM t1 LEFT JOIN t2 ON (t1.i=t2.i and t1.j=t2.j ... )
*/

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void add_join_natural(TABLE_LIST *a,TABLE_LIST *b)
{
  b->natural_join=a;
}

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/*
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  Reload/resets privileges and the different caches.

  SYNOPSIS
    reload_acl_and_cache()
    thd			Thread handler
    options             What should be reset/reloaded (tables, privileges,
    slave...)
    tables              Tables to flush (if any)
    write_to_binlog     Depending on 'options', it may be very bad to write the
                        query to the binlog (e.g. FLUSH SLAVE); this is a
                        pointer where, if it is not NULL, reload_acl_and_cache()
                        will put 0 if it thinks we really should not write to
                        the binlog. Otherwise it will put 1.

  RETURN
    0	 ok
    !=0  error
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*/

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bool reload_acl_and_cache(THD *thd, ulong options, TABLE_LIST *tables,
                          bool *write_to_binlog)
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{
  bool result=0;
  select_errors=0;				/* Write if more errors */
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  bool tmp_write_to_binlog= 1;
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  if (options & REFRESH_GRANT)
  {
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    acl_reload(thd);
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    grant_reload(thd);
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    if (mqh_used)
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      reset_mqh(thd,(LEX_USER *) NULL,true);
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  }
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#endif
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  if (options & REFRESH_LOG)
  {
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    /*
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      Flush the normal query log, the update log, the binary log,
      the slow query log, and the relay log (if it exists).
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    */
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    /* 
     Writing this command to the binlog may result in infinite loops when doing
     mysqlbinlog|mysql, and anyway it does not really make sense to log it
     automatically (would cause more trouble to users than it would help them)
    */
    tmp_write_to_binlog= 0;
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    mysql_log.new_file(1);
    mysql_update_log.new_file(1);
    mysql_bin_log.new_file(1);
    mysql_slow_log.new_file(1);
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#ifdef HAVE_REPLICATION
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    if (expire_logs_days)
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    {
      long purge_time= time(0) - expire_logs_days*24*60*60;
      if (purge_time >= 0)
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	mysql_bin_log.purge_logs_before_date(purge_time);
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    }
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    LOCK_ACTIVE_MI;
    rotate_relay_log(active_mi);
    UNLOCK_ACTIVE_MI;
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#endif
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    if (ha_flush_logs())
      result=1;
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    if (flush_error_log())
      result=1;
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  }
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#ifdef HAVE_QUERY_CACHE
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  if (options & REFRESH_QUERY_CACHE_FREE)
  {
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    query_cache.pack();				// FLUSH QUERY CACHE
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    options &= ~REFRESH_QUERY_CACHE; //don't flush all cache, just free memory
  }
  if (options & (REFRESH_TABLES | REFRESH_QUERY_CACHE))
  {
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    query_cache.flush();			// RESET QUERY CACHE
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  }
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#endif /*HAVE_QUERY_CACHE*/
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  /*
    Note that if REFRESH_READ_LOCK bit is set then REFRESH_TABLES is set too
    (see sql_yacc.yy)
  */
  if (options & (REFRESH_TABLES | REFRESH_READ_LOCK)) 
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  {
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    if ((options & REFRESH_READ_LOCK) && thd)
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    {
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      /*
	Writing to the binlog could cause deadlocks, as we don't log
	UNLOCK TABLES
      */
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      tmp_write_to_binlog= 0;
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      if (lock_global_read_lock(thd))
	return 1;
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    }
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    result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1, tables);
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  }
  if (options & REFRESH_HOSTS)
    hostname_cache_refresh();
  if (options & REFRESH_STATUS)
    refresh_status();
  if (options & REFRESH_THREADS)
    flush_thread_cache();
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#ifdef HAVE_REPLICATION
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  if (options & REFRESH_MASTER)
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  {
    tmp_write_to_binlog= 0;
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    if (reset_master(thd))
      result=1;
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  }
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#endif
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#ifdef OPENSSL
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   if (options & REFRESH_DES_KEY_FILE)
   {
     if (des_key_file)
       result=load_des_key_file(des_key_file);
   }
#endif
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#ifdef HAVE_REPLICATION
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 if (options & REFRESH_SLAVE)
 {
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   tmp_write_to_binlog= 0;
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   LOCK_ACTIVE_MI;
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   if (reset_slave(thd, active_mi))
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     result=1;
   UNLOCK_ACTIVE_MI;
 }
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#endif
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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 if (options & REFRESH_USER_RESOURCES)
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   reset_mqh(thd,(LEX_USER *) NULL);
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#endif
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 if (write_to_binlog)
   *write_to_binlog= tmp_write_to_binlog;
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 return result;
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}

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/*
  kill on thread

  SYNOPSIS
    kill_one_thread()
    thd			Thread class
    id			Thread id

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

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void kill_one_thread(THD *thd, ulong id)
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{
  THD *tmp;
  uint error=ER_NO_SUCH_THREAD;
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  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For unlink from list
  I_List_iterator<THD> it(threads);
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  while ((tmp=it++))
  {
    if (tmp->thread_id == id)
    {
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      pthread_mutex_lock(&tmp->LOCK_delete);	// Lock from delete
      break;
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    }
  }
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
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  if (tmp)
  {
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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    if ((thd->master_access & SUPER_ACL) ||
	!strcmp(thd->user,tmp->user))
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#endif
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    {
      tmp->awake(1 /*prepare to die*/);
      error=0;
    }
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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    else
      error=ER_KILL_DENIED_ERROR;
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#endif
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    pthread_mutex_unlock(&tmp->LOCK_delete);
  }

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  if (!error)
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    send_ok(thd);
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  else
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    net_printf(thd,error,id);
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}

/* Clear most status variables */

static void refresh_status(void)
{
  pthread_mutex_lock(&LOCK_status);
  for (struct show_var_st *ptr=status_vars; ptr->name; ptr++)
  {
    if (ptr->type == SHOW_LONG)
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      *(ulong*) ptr->value= 0;
    else if (ptr->type == SHOW_KEY_CACHE_LONG)
    {
      /*
	Reset value in 'default' key cache.
	This needs to be recoded when we have thread specific key values
      */
      char *value= (((char*) sql_key_cache) +
		    (uint) ((char*) (ptr->value) -
			    (char*) &dflt_key_cache_var));
      *(ulong*) value= 0;
    }
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  }
  pthread_mutex_unlock(&LOCK_status);
}
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	/* If pointer is not a null pointer, append filename to it */

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static bool append_file_to_dir(THD *thd, char **filename_ptr, char *table_name)
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{
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  char buff[FN_REFLEN],*ptr, *end;
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  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))
  {
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    my_error(ER_WRONG_TABLE_NAME, MYF(0), *filename_ptr);
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    return 1;
  }
  /* Fix is using unix filename format on dos */
  strmov(buff,*filename_ptr);
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  end=convert_dirname(buff, *filename_ptr, NullS);
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  if (!(ptr=thd->alloc((uint) (end-buff)+(uint) strlen(table_name)+1)))
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    return 1;					// End of memory
  *filename_ptr=ptr;
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  strxmov(ptr,buff,table_name,NullS);
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  return 0;
}
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/*
  Check if the select is a simple select (not an union)

  SYNOPSIS
    check_simple_select()

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

bool check_simple_select()
{
  THD *thd= current_thd;
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  if (thd->lex.current_select != &thd->lex.select_lex)
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  {
    char command[80];
    strmake(command, thd->lex.yylval->symbol.str,
	    min(thd->lex.yylval->symbol.length, sizeof(command)-1));
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    net_printf(thd, ER_CANT_USE_OPTION_HERE, command);
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    return 1;
  }
  return 0;
}
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Comp_creator *comp_eq_creator(bool invert)
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{
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  return invert?(Comp_creator *)&ne_creator:(Comp_creator *)&eq_creator;
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}

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

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

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

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

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Comp_creator *comp_ne_creator(bool invert)
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{
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  return invert?(Comp_creator *)&eq_creator:(Comp_creator *)&ne_creator;
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}
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/*
  Construct ALL/ANY/SOME subquery Item

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

  RETURN VALUE
    constructed Item (or 0 if out of memory)
*/
Item * all_any_subquery_creator(Item *left_expr,
				chooser_compare_func_creator cmp,
				bool all,
				SELECT_LEX *select_lex)
{
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  if ((cmp == &comp_eq_creator) && !all)       //  = ANY <=> IN
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    return new Item_in_subselect(left_expr, select_lex);
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  if ((cmp == &comp_ne_creator) && all)        // <> ALL <=> NOT IN
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    return new Item_func_not(new Item_in_subselect(left_expr, select_lex));

  Item_allany_subselect *it=
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    new Item_allany_subselect(left_expr, (*cmp)(all), select_lex, all);
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  if (all)
    return it->upper_not= new Item_func_not_all(it);	/* ALL */

  return it;						/* ANY/SOME */
}