sql_parse.cc 134 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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extern "C" pthread_mutex_t THR_LOCK_keycache;
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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, host_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);
  host_len=strlen(host);
  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 = 0;	/* BUG FIX by Heikki Oct 25, 2003 */
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    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;
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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      /*
      BUG FIX by Heikki Oct 25, 2003: since get_or_create_user_conn()
      creates or finds the user object and does NOT check anything about ur,
      we should call it always.
      */

      if ( /* (ur.questions || ur.updates ||
           ur.connections || max_user_connections) && */
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          get_or_create_user_conn(thd,thd->user,thd->host_or_ip,&ur))
        DBUG_RETURN(1);
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      /*
      BUG FIX by Heikki Oct 25, 2003: since
      check_for_max_user_connections() keeps the count of user connections,
      and we delete the user object when the number of connections drops to
      zero, we must call it always to keep the count right! Otherwise the
      user object can get deleted too early, which caused memory corruption
      to a user in Oct 2003.
      */

      if (thd->user_connect &&
		/* thd->user_connect->user_resources.connections && */
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          check_for_max_user_connections(thd, thd->user_connect))
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        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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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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  /*
  FIX by Heikki Oct 25, 2003: protect the operation with a mutex: is there
  a race condition here otherwise?
  */  

  (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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  uc->connections++;
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  if (uc->user_resources.connections &&
      uc->conn_per_hour++ >= uc->user_resources.connections)
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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;
  }
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end:
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  (void) pthread_mutex_unlock(&LOCK_user_conn);

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  DBUG_RETURN(error);
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}


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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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  /*
  FIX by Heikki Oct 25, 2003: protect the operation with a mutex: is there
  a race condition here otherwise?
  */  

  (void) pthread_mutex_lock(&LOCK_user_conn);

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  if ((uc->connections && !--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*/
602

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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"))
636
    {
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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);
  }
663
  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);
730
  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
    */
756
    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;
  }

784
  if (thd->client_capabilities & CLIENT_IGNORE_SPACE)
785
    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"));
805
    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)
823
    thd->variables.net_wait_timeout= thd->variables.net_interactive_timeout;
824
  if ((thd->client_capabilities & CLIENT_TRANSACTIONS) &&
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      opt_using_transactions)
    net->return_status= &thd->server_status;
827
  net->read_timeout=(uint) thd->variables.net_read_timeout;
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  char *user= end;
  char *passwd= strend(user)+1;
831
  char *db= passwd;
832
  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;
850
    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);
857
  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
872
  if (!(test_flags & TEST_NO_THREADS) & my_thread_init())
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  {
874
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
875
    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);
902
    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;

913
    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);
944
    free_root(&thd->mem_root,MYF(0));
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    if (net->error && net->vio != 0 && net->report_error)
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946
    {
947
      if (!thd->killed && thd->variables.log_warnings)
948 949 950 951 952 953
	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)));
954
      send_error(thd,net->last_errno,NullS);
955
      statistic_increment(aborted_threads,&LOCK_status);
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956
    }
957 958 959 960
    else if (thd->killed)
    {
      statistic_increment(aborted_threads,&LOCK_status);
    }
961
    
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962
end_thread:
963
    close_connection(thd, 0, 1);
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964 965 966 967 968 969 970 971 972 973 974
    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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975 976
#endif /* EMBEDDED_LIBRARY */

977 978 979 980
/*
  Execute commands from bootstrap_file.
  Used when creating the initial grant tables
*/
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981

982
extern "C" pthread_handler_decl(handle_bootstrap,arg)
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983
{
984 985 986
  THD *thd=(THD*) arg;
  FILE *file=bootstrap_file;
  char *buff;
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987

988
  /* The following must be called before DBUG_ENTER */
989
  if (my_thread_init() || thd->store_globals())
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990
  {
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991
#ifndef EMBEDDED_LIBRARY
992
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
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993
#endif
994
    thd->fatal_error();
995
    goto end;
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996
  }
997 998
  DBUG_ENTER("handle_bootstrap");

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999
#ifndef EMBEDDED_LIBRARY
1000 1001
  pthread_detach_this_thread();
  thd->thread_stack= (char*) &thd;
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1002
#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__)
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1003
  sigset_t set;
1004 1005
  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
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1006
#endif
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1007
#endif /* EMBEDDED_LIBRARY */
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1008

1009
  if (thd->variables.max_join_size == HA_POS_ERROR)
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1010 1011 1012 1013
    thd->options |= OPTION_BIG_SELECTS;

  thd->proc_info=0;
  thd->version=refresh_version;
1014
  thd->priv_user=thd->user=(char*) my_strdup("boot", MYF(MY_WME));
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1015

1016
  buff= (char*) thd->net.buff;
1017
  thd->init_for_queries();
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1018 1019
  while (fgets(buff, thd->net.max_packet, file))
  {
1020
    uint length=(uint) strlen(buff);
1021
    while (length && (my_isspace(thd->charset(), buff[length-1]) ||
1022
           buff[length-1] == ';'))
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1023 1024
      length--;
    buff[length]=0;
1025
    thd->query_length=length;
1026 1027
    thd->query= thd->memdup_w_gap(buff, length+1, thd->db_length+1);
    thd->query[length] = '\0';
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1028
    thd->query_id=query_id++;
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1029
#ifndef NO_EMBEDDED_ACCESS_CHECKS
1030
    if (mqh_used && thd->user_connect && check_mqh(thd, SQLCOM_END))
1031 1032 1033 1034 1035 1036
    {
      thd->net.error = 0;
      close_thread_tables(thd);			// Free tables
      free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
      break;
    }
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1037
#endif
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1038 1039
    mysql_parse(thd,thd->query,length);
    close_thread_tables(thd);			// Free tables
1040
    if (thd->is_fatal_error)
1041
      break;
1042
    free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
1043
    free_root(&thd->transaction.mem_root,MYF(MY_KEEP_PREALLOC));
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1044
  }
1045 1046 1047

  /* thd->fatal_error should be set in case something went wrong */
end:
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1048
#ifndef EMBEDDED_LIBRARY
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  (void) pthread_mutex_lock(&LOCK_thread_count);
  thread_count--;
  (void) pthread_mutex_unlock(&LOCK_thread_count);
1052
  (void) pthread_cond_broadcast(&COND_thread_count);
1053 1054
  my_thread_end();
  pthread_exit(0);
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1055
#endif
1056
  DBUG_RETURN(0);				// Never reached
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1057 1058
}

1059
    /* This works because items are allocated with sql_alloc() */
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1060

1061
void free_items(Item *item)
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1062
{
1063
  for (; item ; item=item->next)
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    delete item;
}

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;
1074
  if (!(table_list = (TABLE_LIST*) thd->calloc(sizeof(TABLE_LIST))))
1075
    DBUG_RETURN(1); // out of memory
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1076
  table_list->db = db;
1077
  table_list->real_name = table_list->alias = tbl_name;
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1078 1079 1080
  table_list->lock_type = TL_READ_NO_INSERT;
  table_list->next = 0;

1081 1082
  if (!db || check_db_name(db))
  {
1083
    net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
1084 1085
    goto err;
  }
1086
  if (lower_case_table_names)
1087
    my_casedn_str(files_charset_info, tbl_name);
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1088
  remove_escape(table_list->real_name);
1089 1090 1091 1092

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

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1093 1094
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  if (check_access(thd, SELECT_ACL, db, &table_list->grant.privilege,0,0))
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1095
    goto err;
1096
  if (grant_option && check_grant(thd, SELECT_ACL, table_list))
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1097
    goto err;
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1098
#endif
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1099
  thd->free_list = 0;
1100
  thd->query_length=(uint) strlen(tbl_name);
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1101
  thd->query = tbl_name;
1102 1103
  if ((error = mysqld_dump_create_info(thd, table, -1)))
  {
1104
    my_error(ER_GET_ERRNO, MYF(0), my_errno);
1105 1106
    goto err;
  }
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1107
  net_flush(&thd->net);
1108
  if ((error= table->file->dump(thd,fd)))
1109
    my_error(ER_GET_ERRNO, MYF(0));
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1110

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1111 1112
err:
  close_thread_tables(thd);
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1113
  DBUG_RETURN(error);
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1114 1115 1116
}


1117
	/* Execute one command from socket (query or simple command) */
1118 1119

#ifndef EMBEDDED_LIBRARY
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1120 1121 1122
bool do_command(THD *thd)
{
  char *packet;
1123 1124
  uint old_timeout;
  ulong packet_length;
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1125 1126 1127 1128 1129
  NET *net;
  enum enum_server_command command;
  DBUG_ENTER("do_command");

  net= &thd->net;
1130 1131 1132 1133 1134
  /*
    indicator of uninitialized lex => normal flow of errors handling
    (see my_message_sql)
  */
  thd->lex.current_select= 0;
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1135 1136

  packet=0;
1137 1138 1139
  old_timeout=net->read_timeout;
  // Wait max for 8 hours
  net->read_timeout=(uint) thd->variables.net_wait_timeout;
1140
  thd->clear_error();				// Clear error message
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1141 1142 1143 1144

  net_new_transaction(net);
  if ((packet_length=my_net_read(net)) == packet_error)
  {
1145 1146 1147 1148 1149
    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)
1150 1151
    {
      statistic_increment(aborted_threads,&LOCK_status);
1152
      DBUG_RETURN(TRUE);			// We have to close it.
1153
    }
1154
    send_error(thd,net->last_errno,NullS);
1155
    net->error= 0;
1156
    DBUG_RETURN(FALSE);
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1157 1158 1159 1160 1161
  }
  else
  {
    packet=(char*) net->read_pos;
    command = (enum enum_server_command) (uchar) packet[0];
1162 1163
    if (command >= COM_END)
      command= COM_END;				// Wrong command
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1164 1165 1166
    DBUG_PRINT("info",("Command on %s = %d (%s)",
		       vio_description(net->vio), command,
		       command_name[command]));
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1167
  }
1168
  net->read_timeout=old_timeout;		// restore it
1169
  DBUG_RETURN(dispatch_command(command,thd, packet+1, (uint) packet_length));
1170
}
1171
#endif  /* EMBEDDED_LIBRARY */
1172

1173

1174 1175 1176 1177
bool dispatch_command(enum enum_server_command command, THD *thd,
		      char* packet, uint packet_length)
{
  NET *net= &thd->net;
1178
  bool error= 0;
1179 1180 1181 1182
  /*
    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
  */
1183 1184 1185
  bool slow_command=FALSE;
  DBUG_ENTER("dispatch_command");

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1186
  thd->command=command;
1187
  thd->set_time();
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1188 1189 1190 1191 1192 1193
  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));
1194

1195
  thd->lex.select_lex.options=0;		// We store status here
1196
  switch (command) {
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1197
  case COM_INIT_DB:
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1198 1199 1200 1201 1202 1203 1204 1205 1206
  {
    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;
  }
1207
#ifdef HAVE_REPLICATION
1208 1209
  case COM_REGISTER_SLAVE:
  {
1210
    if (!register_slave(thd, (uchar*)packet, packet_length))
1211
      send_ok(thd);
1212 1213
    break;
  }
1214
#endif
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1215
  case COM_TABLE_DUMP:
1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229
  {
    char *db, *tbl_name;
    uint db_len= *(uchar*) packet;
    uint tbl_len= *(uchar*) (packet + db_len + 1);

    statistic_increment(com_other, &LOCK_status);
    slow_command= TRUE;
    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;
  }
1230
#ifndef EMBEDDED_LIBRARY
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1231 1232
  case COM_CHANGE_USER:
  {
1233
    thd->change_user();
1234
    thd->clear_error();                         // if errors from rollback
1235

1236 1237
    statistic_increment(com_other, &LOCK_status);
    char *user= (char*) packet;
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1238
    char *passwd= strend(user)+1;
1239 1240 1241 1242 1243
    /* 
      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).
    */
1244
    char db_buff[NAME_LEN+1];                 // buffer to store db in utf8 
1245 1246 1247 1248
    char *db= passwd;
    uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ? 
      *passwd++ : strlen(passwd);
    db+= passwd_len + 1;
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1249
    /* Small check for incomming packet */
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1250
    if ((uint) ((uchar*) db - net->read_pos) > packet_length)
1251 1252 1253 1254
    {
      send_error(thd, ER_UNKNOWN_COM_ERROR);
      break;
    }
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1255

1256
    /* Convert database name to utf8 */
1257 1258 1259 1260
    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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1261

1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276
    /* 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;
    USER_CONN *save_uc= thd->user_connect;
    thd->user= my_strdup(user, MYF(0));
    if (!thd->user)
    {
      thd->user= save_user;
      send_error(thd, ER_OUT_OF_RESOURCES);
      break;
    }
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1277

1278
    int res= check_user(thd, COM_CHANGE_USER, passwd, passwd_len, db, false);
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1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300
    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;
      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 */
      if (max_connections && save_uc)
        decrease_user_connections(save_uc);
      x_free((gptr) save_db);
      x_free((gptr) save_user);
    }
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1301 1302
    break;
  }
1303
#endif /* EMBEDDED_LIBRARY */
1304 1305
  case COM_EXECUTE:
  {
1306
    mysql_stmt_execute(thd, packet);
1307 1308 1309 1310
    break;
  }
  case COM_LONG_DATA:
  {
1311
    mysql_stmt_get_longdata(thd, packet, packet_length);
1312 1313 1314 1315
    break;
  }
  case COM_PREPARE:
  {
1316
    mysql_stmt_prepare(thd, packet, packet_length);
1317 1318
    break;
  }
1319 1320 1321 1322 1323
  case COM_CLOSE_STMT:
  {
    mysql_stmt_free(thd, packet);
    break;
  }
1324 1325 1326 1327 1328
  case COM_RESET_STMT:
  {
    mysql_stmt_reset(thd, packet);
    break;
  }
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1329 1330
  case COM_QUERY:
  {
1331 1332
    if (alloc_query(thd, packet, packet_length))
      break;					// fatal error is set
1333
    mysql_log.write(thd,command,"%s",thd->query);
1334
    DBUG_PRINT("query",("%-.4096s",thd->query));
1335
    mysql_parse(thd,thd->query, thd->query_length);
1336

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1337
    while (!thd->killed && !thd->is_fatal_error && thd->lex.found_colon)
1338
    {
1339
      char *packet= thd->lex.found_colon;
1340 1341 1342 1343 1344 1345
      /* 
        Multiple queries exits, execute them individually
      */
      if (thd->lock || thd->open_tables || thd->derived_tables)
        close_thread_tables(thd);		

1346
      ulong length= thd->query_length-(ulong)(thd->lex.found_colon-thd->query);
1347 1348
      
      /* Remove garbage at start of query */
1349
      while (my_isspace(thd->charset(), *packet) && length > 0)
1350 1351 1352 1353 1354
      {
        packet++;
        length--;
      }
      thd->query_length= length;
1355 1356 1357 1358
      thd->query= packet;
      VOID(pthread_mutex_lock(&LOCK_thread_count));
      thd->query_id= query_id++;
      VOID(pthread_mutex_unlock(&LOCK_thread_count));
1359 1360 1361
      mysql_parse(thd, packet, length);
    }

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1362 1363 1364 1365 1366
    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),WAIT_PRIOR);
    DBUG_PRINT("info",("query ready"));
    break;
  }
1367
  case COM_FIELD_LIST:				// This isn't actually needed
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1368
#ifdef DONT_ALLOW_SHOW_COMMANDS
1369
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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    break;
#else
  {
1373
    char *fields, *pend;
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1374
    TABLE_LIST table_list;
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1375 1376
    LEX_STRING conv_name;

1377
    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))
    {
1381
      send_error(thd,ER_NO_DB_ERROR);
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1382 1383 1384
      break;
    }
    thd->free_list=0;
1385
    pend= strend(packet);
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1386 1387 1388
    thd->convert_string(&conv_name, system_charset_info,
			packet, (uint) (pend-packet), thd->charset());
    table_list.alias= table_list.real_name= conv_name.str;
1389
    packet= pend+1;
1390
    // command not cachable => no gap for data base name
1391 1392
    if (!(thd->query=fields=thd->memdup(packet,thd->query_length+1)))
      break;
1393
    mysql_log.write(thd,command,"%s %s",table_list.real_name,fields);
1394
    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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1404
#endif /*DONT_ALLOW_SHOW_COMMANDS*/
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1405
    mysqld_list_fields(thd,&table_list,fields);
1406
    free_items(thd->free_list);
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    break;
  }
#endif
  case COM_QUIT:
1411
    /* We don't calculate statistics for this command */
1412
    mysql_log.write(thd,command,NullS);
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    net->error=0;				// Don't give 'abort' message
    error=TRUE;					// End server
    break;

1417
  case COM_CREATE_DB:				// QQ: To be removed
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1418
    {
1419
      statistic_increment(com_stat[SQLCOM_CREATE_DB],&LOCK_status);
1420
      char *db=thd->strdup(packet);
1421
      // null test to handle EOM
1422
      if (!db || !strip_sp(db) || check_db_name(db))
1423
      {
1424
	net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
1425 1426
	break;
      }
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1427
      if (check_access(thd,CREATE_ACL,db,0,1,0))
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1428
	break;
1429
      mysql_log.write(thd,command,packet);
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1430
      mysql_create_db(thd,db,0,0);
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      break;
    }
1433
  case COM_DROP_DB:				// QQ: To be removed
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1434
    {
1435
      statistic_increment(com_stat[SQLCOM_DROP_DB],&LOCK_status);
1436
      char *db=thd->strdup(packet);
1437
      // null test to handle EOM
1438
      if (!db || !strip_sp(db) || check_db_name(db))
1439
      {
1440
	net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
1441 1442
	break;
      }
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1443
      if (check_access(thd,DROP_ACL,db,0,1,0))
1444
	break;
1445 1446
      if (thd->locked_tables || thd->active_transaction())
      {
1447
	send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
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1448
	break;
1449
      }
1450
      mysql_log.write(thd,command,db);
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1451
      mysql_rm_db(thd,db,0,0);
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      break;
    }
1454
#ifndef EMBEDDED_LIBRARY
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  case COM_BINLOG_DUMP:
    {
1457
      statistic_increment(com_other,&LOCK_status);
1458
      slow_command = TRUE;
1459
      if (check_global_access(thd, REPL_SLAVE_ACL))
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1460
	break;
1461
      mysql_log.write(thd,command, 0);
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1462

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      ulong pos;
      ushort flags;
1465
      uint32 slave_server_id;
1466
      /* TODO: The following has to be changed to an 8 byte integer */
1467 1468
      pos = uint4korr(packet);
      flags = uint2korr(packet + 4);
1469
      thd->server_id=0; /* avoid suicide */
1470
      if ((slave_server_id= uint4korr(packet+6))) // mysqlbinlog.server_id==0
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1471
	kill_zombie_dump_threads(slave_server_id);
1472
      thd->server_id = slave_server_id;
1473
      mysql_binlog_send(thd, thd->strdup(packet + 10), (my_off_t) pos, flags);
1474
      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;
    }
1480
#endif
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1481 1482
  case COM_REFRESH:
    {
1483
      statistic_increment(com_stat[SQLCOM_FLUSH],&LOCK_status);
1484
      ulong options= (ulong) (uchar) packet[0];
1485
      if (check_global_access(thd,RELOAD_ACL))
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1486
	break;
1487
      mysql_log.write(thd,command,NullS);
1488 1489 1490 1491
      if (reload_acl_and_cache(thd, options, (TABLE_LIST*) 0, NULL))
        send_error(thd, 0);
      else
        send_ok(thd);
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      break;
    }
1494
#ifndef EMBEDDED_LIBRARY
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1495
  case COM_SHUTDOWN:
1496
    statistic_increment(com_other,&LOCK_status);
1497
    if (check_global_access(thd,SHUTDOWN_ACL))
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1498 1499
      break; /* purecov: inspected */
    DBUG_PRINT("quit",("Got shutdown command"));
1500
    mysql_log.write(thd,command,NullS);
1501
    send_eof(thd);
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1502 1503 1504
#ifdef __WIN__
    sleep(1);					// must wait after eof()
#endif
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1505
#ifndef OS2
1506
    send_eof(thd);				// This is for 'quit request'
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1507
#endif
1508
    close_connection(thd, 0, 1);
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1509
    close_thread_tables(thd);			// Free before kill
1510
    free_root(&thd->mem_root,MYF(0));
1511
    free_root(&thd->transaction.mem_root,MYF(0));
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    kill_mysql();
    error=TRUE;
    break;
1515
#endif
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1516 1517
  case COM_STATISTICS:
  {
1518
    mysql_log.write(thd,command,NullS);
1519
    statistic_increment(com_stat[SQLCOM_SHOW_STATUS],&LOCK_status);
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1520
#ifndef EMBEDDED_LIBRARY
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1521
    char buff[200];
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#else
    char *buff= thd->net.last_error;
#endif
1525
    ulong uptime = (ulong) (thd->start_time - start_time);
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1526
    sprintf((char*) buff,
1527
	    "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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1528 1529 1530 1531 1532
	    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
1533
    if (sf_malloc_cur_memory)				// Using SAFEMALLOC
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1534
      sprintf(strend(buff), "  Memory in use: %ldK  Max memory used: %ldK",
1535 1536
	      (sf_malloc_cur_memory+1023L)/1024L,
	      (sf_malloc_max_memory+1023L)/1024L);
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1537 1538
#endif
#ifndef EMBEDDED_LIBRARY
1539
    VOID(my_net_write(net, buff,(uint) strlen(buff)));
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1540
    VOID(net_flush(net));
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1541
#endif
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    break;
  }
  case COM_PING:
1545
    statistic_increment(com_other,&LOCK_status);
1546
    send_ok(thd);				// Tell client we are alive
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1547 1548
    break;
  case COM_PROCESS_INFO:
1549
    statistic_increment(com_stat[SQLCOM_SHOW_PROCESSLIST],&LOCK_status);
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1550
#ifndef NO_EMBEDDED_ACCESS_CHECKS
1551
    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
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1552
      break;
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1553
#endif
1554
    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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1563 1564 1565
    break;
  case COM_PROCESS_KILL:
  {
1566
    statistic_increment(com_stat[SQLCOM_KILL],&LOCK_status);
1567
    ulong id=(ulong) uint4korr(packet);
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1568 1569 1570 1571
    kill_one_thread(thd,id);
    break;
  }
  case COM_DEBUG:
1572
    statistic_increment(com_other,&LOCK_status);
1573
    if (check_global_access(thd, SUPER_ACL))
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1574 1575
      break;					/* purecov: inspected */
    mysql_print_status(thd);
1576
    mysql_log.write(thd,command,NullS);
1577
    send_eof(thd);
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1578 1579 1580 1581 1582
    break;
  case COM_SLEEP:
  case COM_CONNECT:				// Impossible here
  case COM_TIME:				// Impossible from client
  case COM_DELAYED_INSERT:
1583
  case COM_END:
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1584
  default:
1585
    send_error(thd, ER_UNKNOWN_COM_ERROR);
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    break;
  }
1588
  if (thd->lock || thd->open_tables || thd->derived_tables)
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1589 1590 1591 1592 1593
  {
    thd->proc_info="closing tables";
    close_thread_tables(thd);			/* Free tables */
  }

1594
  if (thd->is_fatal_error)
1595
    send_error(thd,0);				// End of memory ?
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1596 1597

  time_t start_of_query=thd->start_time;
1598
  thd->end_time();				// Set start time
1599

1600
  /* If not reading from backup and if the query took too long */
1601
  if (!slow_command && !thd->user_time) // do not log 'slow_command' queries
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1602
  {
1603 1604
    thd->proc_info="logging slow query";

1605 1606
    if ((ulong) (thd->start_time - thd->time_after_lock) >
	thd->variables.long_query_time ||
1607
	((thd->lex.select_lex.options &
1608
	  (QUERY_NO_INDEX_USED | QUERY_NO_GOOD_INDEX_USED)) &&
1609
	 (specialflag & SPECIAL_LOG_QUERIES_NOT_USING_INDEXES)))
1610 1611 1612 1613
    {
      long_query_count++;
      mysql_slow_log.write(thd, thd->query, thd->query_length, start_of_query);
    }
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1614
  }
1615
  thd->proc_info="cleaning up";
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1616 1617 1618 1619 1620 1621
  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));
1622
  thd->packet.shrink(thd->variables.net_buffer_length);	// Reclaim some memory
1623
  free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
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1624 1625 1626
  DBUG_RETURN(error);
}

1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644

/*
  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
1645
  /* Remove garbage at start and end of query */
1646
  while (my_isspace(thd->charset(),packet[0]) && packet_length > 0)
1647 1648 1649 1650 1651
  {
    packet++;
    packet_length--;
  }
  char *pos=packet+packet_length;		// Point at end null
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1652
  while (packet_length > 0 &&
1653
	 (pos[-1] == ';' || my_isspace(thd->charset() ,pos[-1])))
1654 1655 1656 1657 1658 1659 1660
  {
    pos--;
    packet_length--;
  }
  /* We must allocate some extra memory for query cache */
  if (!(thd->query= (char*) thd->memdup_w_gap((gptr) (packet),
					      packet_length,
1661 1662
					      thd->db_length+ 1 +
					      QUERY_CACHE_FLAGS_SIZE)))
1663 1664 1665 1666 1667 1668 1669 1670 1671 1672
    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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1673 1674 1675 1676 1677 1678
/****************************************************************************
** mysql_execute_command
** Execute command saved in thd and current_lex->sql_command
****************************************************************************/

void
1679
mysql_execute_command(THD *thd)
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1680
{
1681
  int	res= 0;
1682
  LEX	*lex= &thd->lex;
1683
  TABLE_LIST *tables= (TABLE_LIST*) lex->select_lex.table_list.first;
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bell@sanja.is.com.ua committed
1684
  SELECT_LEX *select_lex= &lex->select_lex;
1685
  SELECT_LEX_UNIT *unit= &lex->unit;
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1686 1687
  DBUG_ENTER("mysql_execute_command");

1688 1689 1690 1691 1692 1693
  /*
    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.
  */
1694
  if (tables || &lex->select_lex != lex->all_selects_list)
1695 1696 1697 1698 1699 1700 1701
    mysql_reset_errors(thd);
  /*
    Save old warning count to be able to send to client how many warnings we
    got
  */
  thd->old_total_warn_count= thd->total_warn_count;

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SCRUM  
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1702
#ifdef HAVE_REPLICATION
1703 1704
  if (thd->slave_thread)
  {
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1705
    /*
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merge  
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1706 1707 1708 1709
      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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guilhem@mysql.com committed
1710 1711 1712
    {
      /* we warn the slave SQL thread */
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
1713
      DBUG_VOID_RETURN;
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1714
    }
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merge  
monty@hundin.mysql.fi committed
1715 1716
#ifndef TO_BE_DELETED
    /*
1717 1718 1719
      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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merge  
monty@hundin.mysql.fi committed
1720
    */
1721 1722 1723
    if (lex->sql_command == SQLCOM_SELECT)
    {
      lex->sql_command = SQLCOM_DO;
1724
      lex->insert_list = &select_lex->item_list;
1725
    }
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merge  
monty@hundin.mysql.fi committed
1726
#endif
1727
  }
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1728
#endif /* !HAVE_REPLICATION */
1729
  /*
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bell@sanja.is.com.ua committed
1730 1731
    TODO: make derived tables processing 'inside' SELECT processing.
    TODO: solve problem with depended derived tables in subselects
1732
  */
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Sinisa@sinisa.nasamreza.org committed
1733
  if (lex->derived_tables)
1734
  {
1735 1736 1737
    for (SELECT_LEX *sl= lex->all_selects_list;
	 sl;
	 sl= sl->next_select_in_list())
1738
    {
1739 1740 1741
      for (TABLE_LIST *cursor= sl->get_table_list();
	   cursor;
	   cursor= cursor->next)
1742
      {
1743 1744 1745
	if (cursor->derived && (res=mysql_derived(thd, lex,
						  cursor->derived,
						  cursor)))
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peter@mysql.com committed
1746
	{
1747 1748 1749 1750
	  if (res < 0 || thd->net.report_error)
	    send_error(thd,thd->killed ? ER_SERVER_SHUTDOWN : 0);
	  DBUG_VOID_RETURN;
	}
1751 1752
      }
    }
1753
  }
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monty@mashka.mysql.fi committed
1754 1755
  if (&lex->select_lex != lex->all_selects_list &&
      lex->unit.create_total_list(thd, lex, &tables, 0))
1756
    DBUG_VOID_RETURN;
1757 1758 1759 1760 1761 1762
  
  /*
    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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1763 1764 1765 1766 1767
      !(thd->slave_thread
#ifndef NO_EMBEDDED_ACCESS_CHECKS
	|| (thd->master_access & SUPER_ACL)
#endif
	) &&
1768 1769
      (uc_update_queries[lex->sql_command] > 0))
  {
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monty@mashka.mysql.fi committed
1770
    send_error(thd, ER_CANT_UPDATE_WITH_READLOCK);
1771 1772
    DBUG_VOID_RETURN;
  }
1773

1774
  statistic_increment(com_stat[lex->sql_command],&LOCK_status);
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bk@work.mysql.com committed
1775 1776 1777
  switch (lex->sql_command) {
  case SQLCOM_SELECT:
  {
1778
    select_result *result=lex->result;
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1779
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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1780 1781 1782 1783 1784
    if (tables)
    {
      res=check_table_access(thd,
			     lex->exchange ? SELECT_ACL | FILE_ACL :
			     SELECT_ACL,
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1785
			     tables,0);
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    }
    else
      res=check_access(thd, lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL,
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1789
		       any_db,0,0,0);
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    if (res)
    {
      res=0;
      break;					// Error message is given
    }
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1795
#endif
1796 1797 1798 1799
    /* 
       In case of single SELECT unit->global_parameters points on first SELECT
       TODO: move counters to SELECT_LEX
    */
1800 1801 1802
    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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peter@mysql.com committed
1803
    if (unit->select_limit_cnt <
1804
	(ha_rows) unit->global_parameters->select_limit)
1805
      unit->select_limit_cnt= HA_POS_ERROR;		// no limit
1806
    if (unit->select_limit_cnt == HA_POS_ERROR && !select_lex->next_select())
1807
      select_lex->options&= ~OPTION_FOUND_ROWS;
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1808 1809

    if (!(res=open_and_lock_tables(thd,tables)))
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
1810
    {
1811
      if (lex->describe)
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bell@sanja.is.com.ua committed
1812
      {
1813 1814 1815 1816 1817 1818 1819
	if (!(result= new select_send()))
	{
	  send_error(thd, ER_OUT_OF_RESOURCES);
	  DBUG_VOID_RETURN;
	}
	else
	  thd->send_explain_fields(result);
1820
	fix_tables_pointers(lex->all_selects_list);
1821
	res= mysql_explain_union(thd, &thd->lex.unit, result);
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1822 1823
	MYSQL_LOCK *save_lock= thd->lock;
	thd->lock= (MYSQL_LOCK *)0;
1824
	result->send_eof();
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1825 1826 1827 1828
	thd->lock= save_lock;
      }
      else
      {
1829 1830
	if (!result)
	{
1831
	  if (!(result=new select_send()))
1832 1833 1834 1835 1836 1837 1838 1839 1840
	  {
	    res= -1;
#ifdef DELETE_ITEMS
	    delete select_lex->having;
	    delete select_lex->where;
#endif
	    break;
	  }
	}
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1841 1842 1843
	query_cache_store_query(thd, tables);
	res=handle_select(thd, lex, result);
      }
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1844
    }
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1845 1846
    break;
  }
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1847

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monty@hundin.mysql.fi committed
1848
  case SQLCOM_DO:
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1849
    if (tables && ((res= check_table_access(thd, SELECT_ACL, tables,0)) ||
1850 1851 1852 1853 1854 1855 1856
		   (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;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
1857 1858
    break;

1859
  case SQLCOM_EMPTY_QUERY:
1860
    send_ok(thd);
1861 1862
    break;

1863 1864 1865 1866
  case SQLCOM_HELP:
    res= mysqld_help(thd,lex->help_arg);
    break;

1867
#ifndef EMBEDDED_LIBRARY
1868
  case SQLCOM_PURGE:
1869
  {
1870
    if (check_global_access(thd, SUPER_ACL))
1871
      goto error;
1872
    // PURGE MASTER LOGS TO 'file'
1873 1874 1875
    res = purge_master_logs(thd, lex->to_log);
    break;
  }
1876 1877 1878 1879 1880 1881 1882 1883
  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;
  }
1884
#endif
1885 1886
  case SQLCOM_SHOW_WARNS:
  {
1887 1888
    res= mysqld_show_warnings(thd, (ulong)
			      ((1L << (uint) MYSQL_ERROR::WARN_LEVEL_NOTE) |
1889 1890 1891
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_WARN) |
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR)
			       ));
1892 1893 1894 1895
    break;
  }
  case SQLCOM_SHOW_ERRORS:
  {
1896 1897
    res= mysqld_show_warnings(thd, (ulong)
			      (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR));
1898 1899
    break;
  }
1900 1901
  case SQLCOM_SHOW_NEW_MASTER:
  {
1902
    if (check_global_access(thd, REPL_SLAVE_ACL))
1903
      goto error;
1904
    /* This query don't work now. See comment in repl_failsafe.cc */
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
1905
#ifndef WORKING_NEW_MASTER
1906
    net_printf(thd, ER_NOT_SUPPORTED_YET, "SHOW NEW MASTER");
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1907 1908
    res= 1;
#else
1909
    res = show_new_master(thd);
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1910
#endif
1911 1912
    break;
  }
1913

1914
#ifdef HAVE_REPLICATION
1915 1916
  case SQLCOM_SHOW_SLAVE_HOSTS:
  {
1917
    if (check_global_access(thd, REPL_SLAVE_ACL))
1918 1919 1920 1921
      goto error;
    res = show_slave_hosts(thd);
    break;
  }
1922 1923
  case SQLCOM_SHOW_BINLOG_EVENTS:
  {
1924
    if (check_global_access(thd, REPL_SLAVE_ACL))
1925 1926 1927 1928
      goto error;
    res = show_binlog_events(thd);
    break;
  }
1929 1930
#endif

1931
  case SQLCOM_BACKUP_TABLE:
1932 1933
  {
    if (check_db_used(thd,tables) ||
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1934
	check_table_access(thd,SELECT_ACL, tables,0) ||
1935
	check_global_access(thd, FILE_ACL))
1936 1937
      goto error; /* purecov: inspected */
    res = mysql_backup_table(thd, tables);
1938

1939 1940
    break;
  }
1941
  case SQLCOM_RESTORE_TABLE:
1942 1943
  {
    if (check_db_used(thd,tables) ||
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1944
	check_table_access(thd, INSERT_ACL, tables,0) ||
1945
	check_global_access(thd, FILE_ACL))
1946 1947 1948 1949
      goto error; /* purecov: inspected */
    res = mysql_restore_table(thd, tables);
    break;
  }
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1950 1951 1952
  case SQLCOM_PRELOAD_KEYS:
  {
    if (check_db_used(thd, tables) ||
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hf@deer.(none) committed
1953
	check_access(thd, INDEX_ACL, tables->db, &tables->grant.privilege,0,0))
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igor@rurik.mysql.com committed
1954 1955 1956 1957
      goto error; 
    res = mysql_preload_keys(thd, tables);
    break;
  }
1958
#ifdef HAVE_REPLICATION
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1959
  case SQLCOM_CHANGE_MASTER:
1960
  {
1961
    if (check_global_access(thd, SUPER_ACL))
1962
      goto error;
1963 1964 1965
    LOCK_ACTIVE_MI;
    res = change_master(thd,active_mi);
    UNLOCK_ACTIVE_MI;
1966 1967
    break;
  }
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1968
  case SQLCOM_SHOW_SLAVE_STAT:
1969
  {
1970 1971
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
1972
      goto error;
1973 1974 1975
    LOCK_ACTIVE_MI;
    res = show_master_info(thd,active_mi);
    UNLOCK_ACTIVE_MI;
1976 1977
    break;
  }
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1978
  case SQLCOM_SHOW_MASTER_STAT:
1979
  {
1980 1981
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
1982 1983 1984 1985
      goto error;
    res = show_binlog_info(thd);
    break;
  }
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peter@mysql.com committed
1986

1987
  case SQLCOM_LOAD_MASTER_DATA: // sync with master
1988
    if (check_global_access(thd, SUPER_ACL))
1989
      goto error;
1990 1991 1992 1993
    if (end_active_trans(thd))
      res= -1;
    else
      res = load_master_data(thd);
1994
    break;
1995
#endif /* HAVE_REPLICATION */
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1996 1997 1998
#ifdef HAVE_INNOBASE_DB
  case SQLCOM_SHOW_INNODB_STATUS:
    {
1999
      if (check_global_access(thd, SUPER_ACL))
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heikki@hundin.mysql.fi committed
2000 2001 2002 2003 2004
	goto error;
      res = innodb_show_status(thd);
      break;
    }
#endif
2005
#ifdef HAVE_REPLICATION
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2006
  case SQLCOM_LOAD_MASTER_TABLE:
2007
  {
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2008 2009
    if (!tables->db)
      tables->db=thd->db;
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hf@deer.(none) committed
2010 2011
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,CREATE_ACL,tables->db,&tables->grant.privilege,0,0))
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2012 2013 2014 2015 2016 2017 2018 2019 2020
      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)
2021
	goto error;
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2022
    }
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2023
#endif
2024
    if (strlen(tables->real_name) > NAME_LEN)
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2025
    {
monty@mashka.mysql.fi's avatar
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2026
      net_printf(thd,ER_WRONG_TABLE_NAME,tables->real_name);
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2027 2028
      break;
    }
2029
    LOCK_ACTIVE_MI;
2030 2031 2032 2033
    /*
      fetch_master_table will send the error to the client on failure.
      Give error if the table already exists.
    */
2034
    if (!fetch_master_table(thd, tables->db, tables->real_name,
2035
			    active_mi, 0, 0))
2036
    {
2037
      send_ok(thd);
2038 2039
    }
    UNLOCK_ACTIVE_MI;
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2040
    break;
2041
  }
2042
#endif /* HAVE_REPLICATION */
2043

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2044
  case SQLCOM_CREATE_TABLE:
2045
  {
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hf@deer.(none) committed
2046
#ifndef NO_EMBEDDED_ACCESS_CHECKS
2047 2048
    ulong want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
		      CREATE_TMP_ACL : CREATE_ACL);
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hf@deer.(none) committed
2049
#endif
2050 2051
    if (!tables->db)
      tables->db=thd->db;
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hf@deer.(none) committed
2052 2053
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,want_priv,tables->db,&tables->grant.privilege,0,0) ||
2054 2055 2056
	check_merge_table_access(thd, tables->db,
				 (TABLE_LIST *)
				 lex->create_info.merge_list.first))
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2057
      goto error;				/* purecov: inspected */
2058
    if (grant_option && want_priv != CREATE_TMP_ACL)
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bk@work.mysql.com committed
2059 2060 2061 2062
    {
      /* Check that the first table has CREATE privilege */
      TABLE_LIST *tmp_table_list=tables->next;
      tables->next=0;
2063
      bool error=check_grant(thd, want_priv, tables);
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bk@work.mysql.com committed
2064 2065 2066 2067
      tables->next=tmp_table_list;
      if (error)
	goto error;
    }
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2068
#endif
2069
    if (strlen(tables->real_name) > NAME_LEN)
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bk@work.mysql.com committed
2070
    {
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2071
      net_printf(thd, ER_WRONG_TABLE_NAME, tables->alias);
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2072 2073 2074
      res=0;
      break;
    }
2075 2076 2077
#ifndef HAVE_READLINK
    lex->create_info.data_file_name=lex->create_info.index_file_name=0;
#else
2078
    /* Fix names if symlinked tables */
2079
    if (append_file_to_dir(thd, &lex->create_info.data_file_name,
2080
			   tables->real_name) ||
2081
	append_file_to_dir(thd,&lex->create_info.index_file_name,
2082
			   tables->real_name))
2083 2084 2085 2086
    {
      res=-1;
      break;
    }
2087
#endif
2088
    if (select_lex->item_list.elements)		// With select
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bk@work.mysql.com committed
2089 2090 2091 2092
    {
      select_result *result;

      if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
2093
	  find_real_table_in_list(tables->next, tables->db, tables->real_name))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2094
      {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2095
	net_printf(thd,ER_UPDATE_TABLE_USED,tables->real_name);
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bk@work.mysql.com committed
2096 2097
	DBUG_VOID_RETURN;
      }
hf@deer.(none)'s avatar
hf@deer.(none) committed
2098
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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2099 2100
      if (tables->next)
      {
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2101
	if (check_table_access(thd, SELECT_ACL, tables->next,0))
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bk@work.mysql.com committed
2102 2103
	  goto error;				// Error message is given
      }
hf@deer.(none)'s avatar
hf@deer.(none) committed
2104
#endif
2105
      select_lex->options|= SELECT_NO_UNLOCK;
2106 2107 2108 2109 2110
      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
2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126

      /* 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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2127 2128
    else // regular create
    {
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venu@myvenu.com committed
2129 2130 2131 2132
      if (lex->name)
        res= mysql_create_like_table(thd, tables, &lex->create_info, 
                                     (Table_ident *)lex->name); 
      else
2133
      {
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venu@myvenu.com committed
2134 2135 2136 2137
        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
2138
      }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2139
      if (!res)
2140
	send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2141 2142
    }
    break;
2143
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2144 2145 2146
  case SQLCOM_CREATE_INDEX:
    if (!tables->db)
      tables->db=thd->db;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2147 2148
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,INDEX_ACL,tables->db,&tables->grant.privilege,0,0))
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bk@work.mysql.com committed
2149 2150 2151
      goto error; /* purecov: inspected */
    if (grant_option && check_grant(thd,INDEX_ACL,tables))
      goto error;
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hf@deer.(none) committed
2152
#endif
2153 2154 2155 2156
    if (end_active_trans(thd))
      res= -1;
    else
      res = mysql_create_index(thd, tables, lex->key_list);
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2157 2158
    break;

2159
#ifdef HAVE_REPLICATION
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2160
  case SQLCOM_SLAVE_START:
2161 2162 2163 2164
  {
    LOCK_ACTIVE_MI;
    start_slave(thd,active_mi,1 /* net report*/);
    UNLOCK_ACTIVE_MI;
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bk@work.mysql.com committed
2165
    break;
2166
  }
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2167
  case SQLCOM_SLAVE_STOP:
2168 2169 2170 2171 2172 2173
  /*
    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,
2174
      so it waits for the client thread because t is locked by it.
2175
    - then the client thread does SLAVE STOP.
2176 2177
      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.
2178 2179 2180 2181 2182
    To prevent that, refuse SLAVE STOP if the
    client thread has locked tables
  */
  if (thd->locked_tables || thd->active_transaction())
  {
2183
    send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
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2184
    break;
2185
  }
2186 2187 2188 2189
  {
    LOCK_ACTIVE_MI;
    stop_slave(thd,active_mi,1/* net report*/);
    UNLOCK_ACTIVE_MI;
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2190
    break;
2191
  }
2192
#endif /* HAVE_REPLICATION */
2193

bk@work.mysql.com's avatar
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2194 2195
  case SQLCOM_ALTER_TABLE:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
2196
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
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2197 2198 2199
    break;
#else
    {
2200
      ulong priv=0;
Sinisa@sinisa.nasamreza.org's avatar
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2201
      if (lex->name && (!lex->name[0] || strlen(lex->name) > NAME_LEN))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2202
      {
2203
	net_printf(thd,ER_WRONG_TABLE_NAME,lex->name);
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bk@work.mysql.com committed
2204 2205 2206
	res=0;
	break;
      }
2207 2208
      if (!tables->db)
	tables->db=thd->db;
2209 2210
      if (!select_lex->db)
	select_lex->db=tables->db;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2211 2212
      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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peter@mysql.com committed
2213
	  check_merge_table_access(thd, tables->db,
2214 2215 2216
				   (TABLE_LIST *)
				   lex->create_info.merge_list.first))
	goto error;				/* purecov: inspected */
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2217 2218
      if (!tables->db)
	tables->db=thd->db;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2219
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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2220 2221 2222 2223 2224 2225 2226 2227 2228
      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;
2229
	  tmp_table.db=select_lex->db;
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2230 2231 2232 2233 2234
	  tmp_table.grant.privilege=priv;
	  if (check_grant(thd,INSERT_ACL | CREATE_ACL,tables))
	    goto error;
	}
      }
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hf@deer.(none) committed
2235
#endif
2236 2237
      /* 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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bk@work.mysql.com committed
2238
      /* ALTER TABLE ends previous transaction */
2239
      if (end_active_trans(thd))
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bk@work.mysql.com committed
2240 2241
	res= -1;
      else
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2242
      {
2243
	res= mysql_alter_table(thd, select_lex->db, lex->name,
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bk@work.mysql.com committed
2244 2245 2246
			       &lex->create_info,
			       tables, lex->create_list,
			       lex->key_list, lex->drop_list, lex->alter_list,
2247
			       select_lex->order_list.elements,
2248
                               (ORDER *) select_lex->order_list.first,
2249
			       lex->drop_primary, lex->duplicates,
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2250 2251 2252
			       lex->alter_keys_onoff,
                               lex->tablespace_op,
			       lex->simple_alter);
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2253
      }
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bk@work.mysql.com committed
2254 2255
      break;
    }
hf@deer.(none)'s avatar
hf@deer.(none) committed
2256
#endif /*DONT_ALLOW_SHOW_COMMANDS*/
2257
  case SQLCOM_RENAME_TABLE:
2258 2259 2260
  {
    TABLE_LIST *table;
    if (check_db_used(thd,tables))
2261
      goto error;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2262
#ifndef NO_EMBEDDED_ACCESS_CHECKS
2263 2264
    for (table=tables ; table ; table=table->next->next)
    {
monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
2265
      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
hf@deer.(none)'s avatar
hf@deer.(none) committed
2266
		       &table->grant.privilege,0,0) ||
2267
	  check_access(thd, INSERT_ACL | CREATE_ACL, table->next->db,
hf@deer.(none)'s avatar
hf@deer.(none) committed
2268
		       &table->next->grant.privilege,0,0))
2269 2270 2271
	goto error;
      if (grant_option)
      {
monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
2272 2273 2274 2275 2276
	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) ||
2277
	    (!test_all_bits(table->next->grant.privilege,
2278
			    INSERT_ACL | CREATE_ACL) &&
monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
2279
	     check_grant(thd,INSERT_ACL | CREATE_ACL, &new_list)))
2280 2281 2282
	  goto error;
      }
    }
hf@deer.(none)'s avatar
hf@deer.(none) committed
2283
#endif
2284
    query_cache_invalidate3(thd, tables, 0);
2285 2286 2287
    if (end_active_trans(thd))
      res= -1;
    else if (mysql_rename_tables(thd,tables))
2288 2289
      res= -1;
    break;
2290
  }
2291
#ifndef EMBEDDED_LIBRARY
2292 2293
  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2294
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
2295 2296 2297
    DBUG_VOID_RETURN;
#else
    {
2298
      if (check_global_access(thd, SUPER_ACL))
2299 2300 2301 2302
	goto error;
      res = show_binlogs(thd);
      break;
    }
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peter@mysql.com committed
2303
#endif
2304
#endif /* EMBEDDED_LIBRARY */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2305
  case SQLCOM_SHOW_CREATE:
2306
#ifdef DONT_ALLOW_SHOW_COMMANDS
2307
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
2308 2309
    DBUG_VOID_RETURN;
#else
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2310
    {
2311 2312
      if (check_db_used(thd, tables) ||
	  check_access(thd, SELECT_ACL | EXTRA_ACL, tables->db,
hf@deer.(none)'s avatar
hf@deer.(none) committed
2313
		       &tables->grant.privilege,0,0))
2314
	goto error;
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monty@donna.mysql.com committed
2315
      res = mysqld_show_create(thd, tables);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2316 2317
      break;
    }
2318
#endif
2319 2320 2321
  case SQLCOM_CHECKSUM:
  {
    if (check_db_used(thd,tables) ||
hf@deer.(none)'s avatar
hf@deer.(none) committed
2322
	check_table_access(thd, SELECT_ACL | EXTRA_ACL , tables,0))
2323
      goto error; /* purecov: inspected */
2324
    res = mysql_checksum_table(thd, tables, &lex->check_opt);
2325 2326
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2327
  case SQLCOM_REPAIR:
2328 2329
  {
    if (check_db_used(thd,tables) ||
hf@deer.(none)'s avatar
hf@deer.(none) committed
2330
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables,0))
2331 2332
      goto error; /* purecov: inspected */
    res = mysql_repair_table(thd, tables, &lex->check_opt);
2333 2334 2335 2336 2337 2338 2339 2340 2341 2342
    /* ! 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);
      }
    }
2343 2344
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2345
  case SQLCOM_CHECK:
2346 2347
  {
    if (check_db_used(thd,tables) ||
hf@deer.(none)'s avatar
hf@deer.(none) committed
2348
 	check_table_access(thd, SELECT_ACL | EXTRA_ACL , tables,0))
2349 2350 2351 2352
      goto error; /* purecov: inspected */
    res = mysql_check_table(thd, tables, &lex->check_opt);
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2353 2354
  case SQLCOM_ANALYZE:
  {
2355
    if (check_db_used(thd,tables) ||
hf@deer.(none)'s avatar
hf@deer.(none) committed
2356
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables,0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2357
      goto error; /* purecov: inspected */
2358
    res = mysql_analyze_table(thd, tables, &lex->check_opt);
2359 2360 2361 2362 2363 2364 2365 2366 2367 2368
    /* ! 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);
      }
    }
2369
    break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2370
  }
2371

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2372 2373 2374
  case SQLCOM_OPTIMIZE:
  {
    HA_CREATE_INFO create_info;
2375
    if (check_db_used(thd,tables) ||
hf@deer.(none)'s avatar
hf@deer.(none) committed
2376
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables,0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2377
      goto error; /* purecov: inspected */
2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388
    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;
2389
      create_info.table_charset=default_charset_info;
2390 2391 2392
      res= mysql_alter_table(thd, NullS, NullS, &create_info,
			     tables, lex->create_list,
			     lex->key_list, lex->drop_list, lex->alter_list,
2393 2394
                             0, (ORDER *) 0,
			     0, DUP_ERROR);
2395 2396 2397
    }
    else
      res = mysql_optimize_table(thd, tables, &lex->check_opt);
2398 2399 2400 2401 2402 2403 2404 2405 2406 2407
    /* ! 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);
      }
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2408 2409 2410
    break;
  }
  case SQLCOM_UPDATE:
2411
    if (check_db_used(thd,tables))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2412
      goto error;
2413

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2414
    if (single_table_command_access(thd, UPDATE_ACL, tables, &res))
2415
	goto error;
2416
    if (select_lex->item_list.elements != lex->value_list.elements)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2417
    {
2418
      send_error(thd,ER_WRONG_VALUE_COUNT);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2419 2420
      DBUG_VOID_RETURN;
    }
2421 2422 2423 2424
    res= mysql_update(thd,tables,
                      select_lex->item_list,
                      lex->value_list,
                      select_lex->where,
2425
		      select_lex->order_list.elements,
2426 2427 2428
                      (ORDER *) select_lex->order_list.first,
                      select_lex->select_limit,
                      lex->duplicates);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2429 2430
    if (thd->net.report_error)
      res= -1;
2431 2432
    break;
  case SQLCOM_UPDATE_MULTI:
hf@deer.(none)'s avatar
hf@deer.(none) committed
2433 2434
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,UPDATE_ACL,tables->db,&tables->grant.privilege,0,0))
2435 2436 2437
      goto error;
    if (grant_option && check_grant(thd,UPDATE_ACL,tables))
      goto error;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2438
#endif
2439
    if (select_lex->item_list.elements != lex->value_list.elements)
2440
    {
2441 2442
      send_error(thd,ER_WRONG_VALUE_COUNT);
      DBUG_VOID_RETURN;
2443 2444
    }
    {
2445
      const char *msg= 0;
2446
      if (select_lex->order_list.elements)
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2447
	msg= "ORDER BY";
2448 2449
      else if (select_lex->select_limit && select_lex->select_limit !=
	       HA_POS_ERROR)
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2450
	msg= "LIMIT";
2451
      if (msg)
2452
      {
2453
	net_printf(thd, ER_WRONG_USAGE, "UPDATE", msg);
2454 2455
	res= 1;
	break;
2456
      }
2457 2458 2459 2460 2461
      res= mysql_multi_update(thd,tables,
			      &select_lex->item_list,
			      &lex->value_list,
			      select_lex->where,
			      select_lex->options,
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2462
			      lex->duplicates, unit, select_lex);
2463
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2464 2465
    break;
  case SQLCOM_REPLACE:
2466 2467
  case SQLCOM_INSERT:
  {
hf@deer.(none)'s avatar
hf@deer.(none) committed
2468
#ifndef NO_EMBEDDED_ACCESS_CHECKS
2469
    my_bool update=(lex->value_list.elements ? UPDATE_ACL : 0);
2470
    ulong privilege= (lex->duplicates == DUP_REPLACE ?
2471
                      INSERT_ACL | DELETE_ACL : INSERT_ACL | update);
2472

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2473
    if (single_table_command_access(thd, privilege, tables, &res))
2474
	goto error;
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
2475 2476
#else
    my_bool update=(lex->value_list.elements ? 1 : 0);
hf@deer.(none)'s avatar
hf@deer.(none) committed
2477
#endif
2478 2479 2480 2481 2482
    if (select_lex->item_list.elements != lex->value_list.elements)
    {
      send_error(thd,ER_WRONG_VALUE_COUNT);
      DBUG_VOID_RETURN;
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2483
    res = mysql_insert(thd,tables,lex->field_list,lex->many_values,
2484
                       select_lex->item_list, lex->value_list,
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
2485
                       (update ? DUP_UPDATE : lex->duplicates));
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2486 2487
    if (thd->net.report_error)
      res= -1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2488
    break;
2489
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2490 2491 2492
  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
2493

2494 2495 2496 2497
    /*
      Check that we have modify privileges for the first table and
      select privileges for the rest
    */
hf@deer.(none)'s avatar
hf@deer.(none) committed
2498
#ifndef NO_EMBEDDED_ACCESS_CHECKS
2499
    {
2500 2501
      ulong privilege= (lex->duplicates == DUP_REPLACE ?
                        INSERT_ACL | DELETE_ACL : INSERT_ACL);
2502 2503 2504
      TABLE_LIST *save_next=tables->next;
      tables->next=0;
      if (check_access(thd, privilege,
hf@deer.(none)'s avatar
hf@deer.(none) committed
2505
		       tables->db,&tables->grant.privilege,0,0) ||
2506 2507
	  (grant_option && check_grant(thd, privilege, tables)))
	goto error;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2508

2509
      tables->next=save_next;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2510
      if ((res=check_table_access(thd, SELECT_ACL, save_next,0)))
2511 2512
	goto error;
    }
hf@deer.(none)'s avatar
hf@deer.(none) committed
2513
#endif
2514 2515
    /* Don't unlock tables until command is written to binary log */
    select_lex->options|= SELECT_NO_UNLOCK;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2516 2517

    select_result *result;
2518 2519 2520 2521
    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
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2522

2523
    if (find_real_table_in_list(tables->next, tables->db, tables->real_name))
2524
    {
2525 2526
      /* Using same table for INSERT and SELECT */
      select_lex->options |= OPTION_BUFFER_RESULT;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2527
    }
2528 2529 2530 2531

    /* 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);
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2532 2533
    lex->select_lex.resolve_mode= SELECT_LEX::NOMATTER_MODE;

2534 2535 2536
    if (!(res=open_and_lock_tables(thd, tables)))
    {
      if ((result=new select_insert(tables->table,&lex->field_list,
2537
				    lex->duplicates)))
2538
	res=handle_select(thd,lex,result);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2539 2540
      if (thd->net.report_error)
	res= -1;
2541 2542 2543
    }
    else
      res= -1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2544 2545
    break;
  }
2546
  case SQLCOM_TRUNCATE:
hf@deer.(none)'s avatar
hf@deer.(none) committed
2547 2548
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,DELETE_ACL,tables->db,&tables->grant.privilege,0,0))
2549
      goto error; /* purecov: inspected */
2550 2551
    if (grant_option && check_grant(thd,DELETE_ACL,tables))
      goto error;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2552
#endif
2553 2554 2555 2556 2557 2558
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
    if (thd->locked_tables || thd->active_transaction())
    {
2559
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION,NullS);
2560 2561 2562 2563
      goto error;
    }
    res=mysql_truncate(thd,tables);
    break;
2564
  case SQLCOM_DELETE:
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2565
  {
hf@deer.(none)'s avatar
hf@deer.(none) committed
2566
#ifndef NO_EMBEDDED_ACCESS_CHECKS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2567 2568
    if (single_table_command_access(thd, DELETE_ACL, tables, &res))
      goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2569 2570
    // Set privilege for the WHERE clause
    tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
hf@deer.(none)'s avatar
hf@deer.(none) committed
2571
#endif
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serg@serg.mysql.com committed
2572 2573
    res = mysql_delete(thd,tables, select_lex->where,
                       (ORDER*) select_lex->order_list.first,
2574
                       select_lex->select_limit, select_lex->options);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2575 2576
    if (thd->net.report_error)
      res= -1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2577 2578
    break;
  }
2579
  case SQLCOM_DELETE_MULTI:
2580 2581 2582 2583 2584
  {
    TABLE_LIST *aux_tables=(TABLE_LIST *)thd->lex.auxilliary_table_list.first;
    TABLE_LIST *auxi;
    uint table_count=0;
    multi_delete *result;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2585

2586 2587
    /* sql_yacc guarantees that tables and aux_tables are not zero */
    if (check_db_used(thd, tables) || check_db_used(thd,aux_tables) ||
hf@deer.(none)'s avatar
hf@deer.(none) committed
2588 2589
	check_table_access(thd,SELECT_ACL, tables,0) ||
	check_table_access(thd,DELETE_ACL, aux_tables,0))
2590 2591
      goto error;
    if ((thd->options & OPTION_SAFE_UPDATES) && !select_lex->where)
2592
    {
2593
      send_error(thd,ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE);
2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608
      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)
      {
2609
	net_printf(thd,ER_NONUNIQ_TABLE,auxi->real_name);
2610 2611
	goto error;
      }
2612
      walk->lock_type= auxi->lock_type;
2613
      auxi->table_list=  walk;		// Remember corresponding table
2614
    }
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2615
    if (add_item_to_list(thd, new Item_null()))
2616
    {
2617
      res= -1;
2618
      break;
2619 2620 2621 2622 2623 2624
    }
    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)
2625
      auxi->table= auxi->table_list->table;
2626
    if (&lex->select_lex != lex->all_selects_list)
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2627
    {
2628 2629 2630 2631 2632
      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))
	{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2633
	  my_error(ER_UPDATE_TABLE_USED, MYF(0), t->real_name);
2634 2635 2636 2637
	  res= -1;
	  break;
	}
      }
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2638
    }
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2639
    fix_tables_pointers(lex->all_selects_list);
2640 2641
    if (!thd->is_fatal_error && (result= new multi_delete(thd,aux_tables,
							  table_count)))
2642
    {
2643 2644 2645
      res= mysql_select(thd, &select_lex->ref_pointer_array,
			select_lex->get_table_list(),
			select_lex->with_wild,
2646
			select_lex->item_list,
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2647
			select_lex->where,
2648
			0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2649 2650
			(ORDER *)NULL,
			select_lex->options | thd->options |
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
2651
			SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK,
2652
			result, unit, select_lex, 0);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2653 2654
      if (thd->net.report_error)
	res= -1;
2655
      delete result;
2656 2657 2658 2659 2660 2661
    }
    else
      res= -1;					// Error is not sent
    close_thread_tables(thd);
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2662
  case SQLCOM_DROP_TABLE:
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
2663
  {
2664 2665
    if (!lex->drop_temporary)
    {
hf@deer.(none)'s avatar
hf@deer.(none) committed
2666
      if (check_table_access(thd,DROP_ACL,tables,0))
2667 2668 2669 2670 2671 2672 2673
	goto error;				/* purecov: inspected */
      if (end_active_trans(thd))
      {
	res= -1;
	break;
      }
    }
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
2674
    else
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686
    {
      /*
	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;
    }
2687
    res= mysql_rm_table(thd,tables,lex->drop_if_exists, lex->drop_temporary);
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
2688 2689
  }
  break;
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bk@work.mysql.com committed
2690 2691 2692
  case SQLCOM_DROP_INDEX:
    if (!tables->db)
      tables->db=thd->db;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2693 2694
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,INDEX_ACL,tables->db,&tables->grant.privilege,0,0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2695 2696 2697
      goto error;				/* purecov: inspected */
    if (grant_option && check_grant(thd,INDEX_ACL,tables))
      goto error;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2698
#endif
2699 2700 2701 2702
    if (end_active_trans(thd))
      res= -1;
    else
      res = mysql_drop_index(thd, tables, lex->drop_list);
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bk@work.mysql.com committed
2703 2704
    break;
  case SQLCOM_SHOW_DATABASES:
2705
#if defined(DONT_ALLOW_SHOW_COMMANDS)
2706
    send_error(thd,ER_NOT_ALLOWED_COMMAND);   /* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2707 2708 2709
    DBUG_VOID_RETURN;
#else
    if ((specialflag & SPECIAL_SKIP_SHOW_DB) &&
2710
	check_global_access(thd, SHOW_DB_ACL))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2711 2712 2713 2714 2715
      goto error;
    res= mysqld_show_dbs(thd, (lex->wild ? lex->wild->ptr() : NullS));
    break;
#endif
  case SQLCOM_SHOW_PROCESSLIST:
hf@deer.(none)'s avatar
hf@deer.(none) committed
2716
#ifndef NO_EMBEDDED_ACCESS_CHECKS
2717
    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2718
      break;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2719
#endif
hf@deer.(none)'s avatar
hf@deer.(none) committed
2720 2721 2722 2723 2724 2725 2726 2727
    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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bk@work.mysql.com committed
2728
    break;
2729 2730 2731 2732 2733 2734 2735 2736 2737
  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;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2738
  case SQLCOM_SHOW_STATUS:
2739
    res= mysqld_show(thd,(lex->wild ? lex->wild->ptr() : NullS),status_vars,
2740
		     OPT_GLOBAL, &LOCK_status);
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bk@work.mysql.com committed
2741 2742 2743
    break;
  case SQLCOM_SHOW_VARIABLES:
    res= mysqld_show(thd, (lex->wild ? lex->wild->ptr() : NullS),
2744 2745
		     init_vars, lex->option_type,
		     &LOCK_global_system_variables);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2746
    break;
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tim@cane.mysql.fi committed
2747 2748
  case SQLCOM_SHOW_LOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2749
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
2750 2751 2752
    DBUG_VOID_RETURN;
#else
    {
hf@deer.(none)'s avatar
hf@deer.(none) committed
2753 2754
#ifndef NO_EMBEDDED_ACCESS_CHECKS
      if (grant_option && check_access(thd, FILE_ACL, any_db,0,0,0))
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
2755
	goto error;
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hf@deer.(none) committed
2756
#endif
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tim@cane.mysql.fi committed
2757 2758 2759 2760
      res= mysqld_show_logs(thd);
      break;
    }
#endif
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bk@work.mysql.com committed
2761
  case SQLCOM_SHOW_TABLES:
2762
    /* FALL THROUGH */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2763
#ifdef DONT_ALLOW_SHOW_COMMANDS
2764
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2765 2766 2767
    DBUG_VOID_RETURN;
#else
    {
2768
      char *db=select_lex->db ? select_lex->db : thd->db;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2769 2770
      if (!db)
      {
2771
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2772 2773 2774
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);				// Fix escaped '_'
2775
      if (check_db_name(db))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2776
      {
2777
        net_printf(thd,ER_WRONG_DB_NAME, db);
2778
        goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2779
      }
hf@deer.(none)'s avatar
hf@deer.(none) committed
2780 2781
#ifndef NO_EMBEDDED_ACCESS_CHECKS
      if (check_access(thd,SELECT_ACL,db,&thd->col_access,0,0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2782
	goto error;				/* purecov: inspected */
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2783
      if (!thd->col_access && check_grant_db(thd,db))
2784
      {
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2785
	net_printf(thd, ER_DBACCESS_DENIED_ERROR,
2786 2787 2788 2789 2790
		   thd->priv_user,
		   thd->priv_host,
		   db);
	goto error;
      }
hf@deer.(none)'s avatar
hf@deer.(none) committed
2791
#endif
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2792
      /* grant is checked in mysqld_show_tables */
2793
      if (select_lex->options & SELECT_DESCRIBE)
2794
        res= mysqld_extend_show_tables(thd,db,
2795
				       (lex->wild ? lex->wild->ptr() : NullS));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2796 2797 2798 2799 2800 2801
      else
	res= mysqld_show_tables(thd,db,
				(lex->wild ? lex->wild->ptr() : NullS));
      break;
    }
#endif
2802 2803 2804
  case SQLCOM_SHOW_OPEN_TABLES:
    res= mysqld_show_open_tables(thd,(lex->wild ? lex->wild->ptr() : NullS));
    break;
2805 2806
  case SQLCOM_SHOW_CHARSETS:
    res= mysqld_show_charsets(thd,(lex->wild ? lex->wild->ptr() : NullS));
2807
    break;
2808 2809 2810
  case SQLCOM_SHOW_COLLATIONS:
    res= mysqld_show_collations(thd,(lex->wild ? lex->wild->ptr() : NullS));
    break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2811 2812
  case SQLCOM_SHOW_FIELDS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2813
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2814 2815 2816
    DBUG_VOID_RETURN;
#else
    {
2817 2818
      char *db=tables->db;
      if (!*db)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2819
      {
2820
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2821 2822 2823
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);			// Fix escaped '_'
2824
      remove_escape(tables->real_name);
hf@deer.(none)'s avatar
hf@deer.(none) committed
2825 2826
#ifndef NO_EMBEDDED_ACCESS_CHECKS
      if (check_access(thd,SELECT_ACL | EXTRA_ACL,db,&thd->col_access,0,0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2827 2828 2829 2830
	goto error;				/* purecov: inspected */
      tables->grant.privilege=thd->col_access;
      if (grant_option && check_grant(thd,SELECT_ACL,tables,2))
	goto error;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2831
#endif
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2832
      res= mysqld_show_fields(thd,tables,
monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
2833 2834
			      (lex->wild ? lex->wild->ptr() : NullS),
			      lex->verbose);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2835 2836 2837 2838 2839
      break;
    }
#endif
  case SQLCOM_SHOW_KEYS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2840
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2841 2842 2843
    DBUG_VOID_RETURN;
#else
    {
2844
      char *db=tables->db;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2845 2846
      if (!db)
      {
2847
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2848 2849 2850
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);			// Fix escaped '_'
2851
      remove_escape(tables->real_name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2852 2853
      if (!tables->db)
	tables->db=thd->db;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2854 2855
#ifndef NO_EMBEDDED_ACCESS_CHECKS
      if (check_access(thd,SELECT_ACL,db,&thd->col_access,0,0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2856 2857 2858 2859
	goto error; /* purecov: inspected */
      tables->grant.privilege=thd->col_access;
      if (grant_option && check_grant(thd,SELECT_ACL,tables,2))
	goto error;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2860
#endif
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2861 2862 2863 2864 2865
      res= mysqld_show_keys(thd,tables);
      break;
    }
#endif
  case SQLCOM_CHANGE_DB:
2866
    mysql_change_db(thd,select_lex->db);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2867
    break;
2868

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2869 2870
  case SQLCOM_LOAD:
  {
hf@deer.(none)'s avatar
hf@deer.(none) committed
2871
#ifndef NO_EMBEDDED_ACCESS_CHECKS
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2872
    uint privilege= (lex->duplicates == DUP_REPLACE ?
2873
		     INSERT_ACL | DELETE_ACL : INSERT_ACL);
2874 2875

    if (!lex->local_file)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2876
    {
hf@deer.(none)'s avatar
hf@deer.(none) committed
2877
      if (check_access(thd,privilege | FILE_ACL,tables->db,0,0,0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2878 2879 2880 2881
	goto error;
    }
    else
    {
2882
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
2883
	  ! opt_local_infile)
2884
      {
2885
	send_error(thd,ER_NOT_ALLOWED_COMMAND);
2886 2887
	goto error;
      }
hf@deer.(none)'s avatar
hf@deer.(none) committed
2888
      if (check_access(thd,privilege,tables->db,&tables->grant.privilege,0,0) ||
2889
	  grant_option && check_grant(thd,privilege,tables))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2890 2891
	goto error;
    }
hf@deer.(none)'s avatar
hf@deer.(none) committed
2892
#endif /*NO_EMBEDDED_ACCESS_CHECKS*/
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2893 2894 2895 2896
    res=mysql_load(thd, lex->exchange, tables, lex->field_list,
		   lex->duplicates, (bool) lex->local_file, lex->lock_option);
    break;
  }
2897

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2898
  case SQLCOM_SET_OPTION:
hf@deer.(none)'s avatar
hf@deer.(none) committed
2899
    if (tables && ((res= check_table_access(thd, SELECT_ACL, tables,0)) ||
2900 2901 2902 2903
		   (res= open_and_lock_tables(thd,tables))))
      break;
    fix_tables_pointers(lex->all_selects_list);
    if (!(res= sql_set_variables(thd, &lex->var_list)))
2904
      send_ok(thd);
2905 2906
    if (thd->net.report_error)
      res= -1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2907
    break;
2908

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2909
  case SQLCOM_UNLOCK_TABLES:
2910
    unlock_locked_tables(thd);
2911 2912
    if (thd->options & OPTION_TABLE_LOCK)
    {
2913
      end_active_trans(thd);
2914
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2915 2916
    }
    if (thd->global_read_lock)
2917
      unlock_global_read_lock(thd);
2918
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2919 2920
    break;
  case SQLCOM_LOCK_TABLES:
2921
    unlock_locked_tables(thd);
2922
    if (check_db_used(thd,tables) || end_active_trans(thd))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2923
      goto error;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2924
    if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, tables,0))
2925
      goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2926
    thd->in_lock_tables=1;
2927
    thd->options|= OPTION_TABLE_LOCK;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2928 2929 2930 2931
    if (!(res=open_and_lock_tables(thd,tables)))
    {
      thd->locked_tables=thd->lock;
      thd->lock=0;
2932
      send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2933
    }
2934 2935
    else
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
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bk@work.mysql.com committed
2936 2937 2938
    thd->in_lock_tables=0;
    break;
  case SQLCOM_CREATE_DB:
2939
  {
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2940
    if (!strip_sp(lex->name) || check_db_name(lex->name))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2941
    {
2942
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2943 2944
      break;
    }
2945 2946 2947 2948 2949 2950 2951
    /*
      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.
    */
2952
#ifdef HAVE_REPLICATION
2953 2954 2955
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
2956 2957
    {
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
2958
      break;
guilhem@mysql.com's avatar
guilhem@mysql.com committed
2959
    }
2960
#endif
hf@deer.(none)'s avatar
hf@deer.(none) committed
2961
    if (check_access(thd,CREATE_ACL,lex->name,0,1,0))
2962
      break;
2963
    res=mysql_create_db(thd,lex->name,&lex->create_info,0);
2964 2965
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2966
  case SQLCOM_DROP_DB:
2967
  {
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2968
    if (!strip_sp(lex->name) || check_db_name(lex->name))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2969
    {
2970
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2971 2972
      break;
    }
2973 2974 2975 2976 2977 2978 2979
    /*
      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.
    */
2980
#ifdef HAVE_REPLICATION
2981 2982 2983
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
2984 2985
    {
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
2986
      break;
guilhem@mysql.com's avatar
guilhem@mysql.com committed
2987
    }
2988
#endif
hf@deer.(none)'s avatar
hf@deer.(none) committed
2989
    if (check_access(thd,DROP_ACL,lex->name,0,1,0))
2990
      break;
2991 2992
    if (thd->locked_tables || thd->active_transaction())
    {
2993
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
2994 2995
      goto error;
    }
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2996
    res=mysql_rm_db(thd,lex->name,lex->drop_if_exists,0);
2997 2998
    break;
  }
2999 3000 3001 3002
  case SQLCOM_ALTER_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
3003
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
3004 3005
      break;
    }
hf@deer.(none)'s avatar
hf@deer.(none) committed
3006
    if (check_access(thd,ALTER_ACL,lex->name,0,1,0))
3007 3008 3009
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
3010
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
3011 3012
      goto error;
    }
3013
    res=mysql_alter_db(thd,lex->name,&lex->create_info);
3014 3015
    break;
  }
3016 3017 3018 3019
  case SQLCOM_SHOW_CREATE_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
3020
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
3021 3022
      break;
    }
hf@deer.(none)'s avatar
hf@deer.(none) committed
3023
    if (check_access(thd,DROP_ACL,lex->name,0,1,0))
3024 3025 3026
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
3027
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
3028 3029
      goto error;
    }
3030
    res=mysqld_show_create_db(thd,lex->name,&lex->create_info);
3031 3032
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3033
  case SQLCOM_CREATE_FUNCTION:
hf@deer.(none)'s avatar
hf@deer.(none) committed
3034
    if (check_access(thd,INSERT_ACL,"mysql",0,1,0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3035 3036 3037
      break;
#ifdef HAVE_DLOPEN
    if (!(res = mysql_create_function(thd,&lex->udf)))
3038
      send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3039 3040 3041 3042 3043
#else
    res= -1;
#endif
    break;
  case SQLCOM_DROP_FUNCTION:
hf@deer.(none)'s avatar
hf@deer.(none) committed
3044
    if (check_access(thd,DELETE_ACL,"mysql",0,1,0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3045 3046
      break;
#ifdef HAVE_DLOPEN
3047
    if (!(res = mysql_drop_function(thd,&lex->udf.name)))
3048
      send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3049 3050 3051 3052
#else
    res= -1;
#endif
    break;
hf@deer.(none)'s avatar
hf@deer.(none) committed
3053
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3054 3055
  case SQLCOM_DROP_USER:
  {
hf@deer.(none)'s avatar
hf@deer.(none) committed
3056
    if (check_access(thd, GRANT_ACL,"mysql",0,1,0))
3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071
      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:
  {
hf@deer.(none)'s avatar
hf@deer.(none) committed
3072
    if (check_access(thd, GRANT_ACL ,"mysql",0,1,0))
3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085
      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;
  }
3086 3087 3088 3089 3090 3091
  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,
hf@deer.(none)'s avatar
hf@deer.(none) committed
3092
		     tables ? 0 : 1,0))
3093 3094
      goto error;

3095 3096 3097 3098
    /*
      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
    */
3099 3100 3101 3102 3103 3104 3105 3106 3107 3108

    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 &&
3109
	     my_strcasecmp(&my_charset_latin1,
3110
                           user->host.str, thd->host_or_ip)))
3111
	{
hf@deer.(none)'s avatar
hf@deer.(none) committed
3112
	  if (check_access(thd, UPDATE_ACL, "mysql",0,1,0))
3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124
	    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;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3125 3126 3127
      if (!(res = mysql_table_grant(thd,tables,lex->users_list, lex->columns,
				    lex->grant,
				    lex->sql_command == SQLCOM_REVOKE)))
3128
      {
3129
	mysql_update_log.write(thd, thd->query, thd->query_length);
3130 3131
	if (mysql_bin_log.is_open())
	{
3132
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
3133 3134 3135 3136 3137 3138 3139 3140
	  mysql_bin_log.write(&qinfo);
	}
      }
    }
    else
    {
      if (lex->columns.elements)
      {
3141
	send_error(thd,ER_ILLEGAL_GRANT_FOR_TABLE);
3142 3143 3144 3145 3146 3147 3148
	res=1;
      }
      else
	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
			  lex->sql_command == SQLCOM_REVOKE);
      if (!res)
      {
3149
	mysql_update_log.write(thd, thd->query, thd->query_length);
3150 3151
	if (mysql_bin_log.is_open())
	{
3152
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
3153 3154
	  mysql_bin_log.write(&qinfo);
	}
3155
	if (mqh_used && lex->sql_command == SQLCOM_GRANT)
3156
	{
3157 3158 3159
	  List_iterator <LEX_USER> str_list(lex->users_list);
	  LEX_USER *user;
	  while ((user=str_list++))
3160
	    reset_mqh(thd,user);
3161
	}
3162 3163 3164 3165
      }
    }
    break;
  }
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
3166
#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/
monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
3167
  case SQLCOM_RESET:
3168 3169 3170 3171 3172 3173 3174
    /* 
       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:
  {
3175
    if (check_global_access(thd,RELOAD_ACL) || check_db_used(thd, tables))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3176
      goto error;
3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200
    /*
      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);
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3201
    break;
3202
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3203 3204 3205
  case SQLCOM_KILL:
    kill_one_thread(thd,lex->thread_id);
    break;
hf@deer.(none)'s avatar
hf@deer.(none) committed
3206
#ifndef NO_EMBEDDED_ACCESS_CHECKS
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3207 3208
  case SQLCOM_SHOW_GRANTS:
    res=0;
3209 3210
    if ((thd->priv_user &&
	 !strcmp(thd->priv_user,lex->grant_user->user.str)) ||
hf@deer.(none)'s avatar
hf@deer.(none) committed
3211
	!check_access(thd, SELECT_ACL, "mysql",0,1,0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3212 3213 3214 3215
    {
      res = mysql_show_grants(thd,lex->grant_user);
    }
    break;
hf@deer.(none)'s avatar
hf@deer.(none) committed
3216
#endif
3217
  case SQLCOM_HA_OPEN:
3218
    if (check_db_used(thd,tables) ||
hf@deer.(none)'s avatar
hf@deer.(none) committed
3219
	check_table_access(thd,SELECT_ACL, tables,0))
3220 3221 3222 3223 3224 3225 3226 3227 3228
      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:
3229 3230 3231 3232 3233
    /*
      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.
    */
serg@serg.mylan's avatar
serg@serg.mylan committed
3234
    if (check_db_used(thd,tables))
3235
      goto error;
serg@serg.mysql.com's avatar
serg@serg.mysql.com committed
3236
    res = mysql_ha_read(thd, tables, lex->ha_read_mode, lex->backup_dir,
3237 3238
			lex->insert_list, lex->ha_rkey_mode, select_lex->where,
			select_lex->select_limit, select_lex->offset_limit);
3239 3240
    break;

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3241
  case SQLCOM_BEGIN:
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
3242 3243 3244 3245 3246 3247
    if (thd->locked_tables)
    {
      thd->lock=thd->locked_tables;
      thd->locked_tables=0;			// Will be automaticly closed
      close_thread_tables(thd);			// Free tables
    }
3248 3249 3250 3251 3252 3253
    if (end_active_trans(thd))
    {
      res= -1;
    }
    else
    {
3254
      thd->options= ((thd->options & (ulong) ~(OPTION_STATUS_NO_TRANS_UPDATE)) |
3255 3256
		     OPTION_BEGIN);
      thd->server_status|= SERVER_STATUS_IN_TRANS;
3257
      send_ok(thd);
3258
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3259 3260
    break;
  case SQLCOM_COMMIT:
3261 3262 3263 3264 3265
    /*
      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...)
    */
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3266
  {
3267
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3268 3269
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    if (!ha_commit(thd))
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3270
    {
3271
      send_ok(thd);
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3272
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3273 3274 3275
    else
      res= -1;
    break;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3276
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3277 3278 3279
  case SQLCOM_ROLLBACK:
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    if (!ha_rollback(thd))
3280
    {
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3281 3282 3283 3284 3285 3286 3287 3288 3289 3290
      /*
        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)
3291
	send_warning(thd,ER_WARNING_NOT_COMPLETE_ROLLBACK,0);
3292
      else
3293
	send_ok(thd);
3294
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3295 3296
    else
      res= -1;
3297
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3298
    break;
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3299 3300 3301
  case SQLCOM_ROLLBACK_TO_SAVEPOINT:
    if (!ha_rollback_to_savepoint(thd, lex->savepoint_name))
    {
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3302
      if ((thd->options & OPTION_STATUS_NO_TRANS_UPDATE) && !thd->slave_thread)
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
3303
	send_warning(thd, ER_WARNING_NOT_COMPLETE_ROLLBACK, 0);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3304
      else
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
3305
	send_ok(thd);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3306 3307 3308 3309
    }
    else
      res= -1;
    break;
3310
  case SQLCOM_SAVEPOINT:
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3311
    if (!ha_savepoint(thd, lex->savepoint_name))
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
3312
      send_ok(thd);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3313 3314
    else
      res= -1;
3315
    break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3316
  default:					/* Impossible */
3317
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3318 3319 3320 3321
    break;
  }
  thd->proc_info="query end";			// QQ
  if (res < 0)
3322
    send_error(thd,thd->killed ? ER_SERVER_SHUTDOWN : 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3323 3324 3325 3326 3327 3328

error:
  DBUG_VOID_RETURN;
}


hf@deer.(none)'s avatar
hf@deer.(none) committed
3329
#ifndef NO_EMBEDDED_ACCESS_CHECKS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3330 3331 3332 3333
/*
  Check grants for commands which work only with one table and all other
  tables belong to subselects.

3334
  SYNOPSIS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345
    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
*/

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3346
static bool single_table_command_access(THD *thd, ulong privilege,
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3347 3348 3349
					TABLE_LIST *tables, int *res)
					 
{
hf@deer.(none)'s avatar
hf@deer.(none) committed
3350
    if (check_access(thd, privilege, tables->db, &tables->grant.privilege,0,0))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3351 3352 3353 3354 3355 3356 3357 3358 3359
      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)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3360 3361 3362
    if (subselects_tables)
    {
      tables->next= subselects_tables;
hf@deer.(none)'s avatar
hf@deer.(none) committed
3363
      if ((*res= check_table_access(thd, SELECT_ACL, subselects_tables,0)))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3364 3365
	return 1;
    }
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3366 3367 3368 3369
    return 0;
}


bk@work.mysql.com's avatar
bk@work.mysql.com committed
3370
/****************************************************************************
3371
  Get the user (global) and database privileges for all used tables
3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384

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

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

    save_priv	In this we store global and db level grants for the table
		Note that we don't store db level grants if the global grants
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
3385 3386
                is enough to satisfy the request and the global grants contains
                a SELECT grant.
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3387 3388 3389
****************************************************************************/

bool
3390
check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
3391
	     bool dont_check_global_grants, bool no_errors)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3392
{
3393 3394 3395 3396
  DBUG_ENTER("check_access");
  DBUG_PRINT("enter",("want_access: %lu  master_access: %lu", want_access,
		      thd->master_access));
  ulong db_access,dummy;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3397 3398 3399 3400 3401
  if (save_priv)
    *save_priv=0;
  else
    save_priv= &dummy;

3402
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3403
  {
3404
    if (!no_errors)
3405
      send_error(thd,ER_NO_DB_ERROR);	/* purecov: tested */
3406
    DBUG_RETURN(TRUE);				/* purecov: tested */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3407 3408 3409 3410
  }

  if ((thd->master_access & want_access) == want_access)
  {
3411 3412 3413 3414 3415 3416 3417 3418
    /*
      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))))
3419
      db_access=acl_get(thd->host, thd->ip,
3420
			thd->priv_user, db, test(want_access & GRANT_ACL));
3421
    *save_priv=thd->master_access | db_access;
3422
    DBUG_RETURN(FALSE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3423
  }
3424
  if (((want_access & ~thd->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
3425
      ! db && dont_check_global_grants)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3426
  {						// We can never grant this
3427
    if (!no_errors)
3428
      net_printf(thd,ER_ACCESS_DENIED_ERROR,
3429
		 thd->priv_user,
3430
		 thd->priv_host,
3431
		 thd->password ? ER(ER_YES) : ER(ER_NO));/* purecov: tested */
3432
    DBUG_RETURN(TRUE);				/* purecov: tested */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3433 3434 3435
  }

  if (db == any_db)
3436
    DBUG_RETURN(FALSE);				// Allow select on anything
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3437

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3438
  if (db && (!thd->db || strcmp(db,thd->db)))
3439
    db_access=acl_get(thd->host, thd->ip,
3440
		      thd->priv_user, db, test(want_access & GRANT_ACL));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3441 3442
  else
    db_access=thd->db_access;
3443 3444
  // Remove SHOW attribute and access rights we already have
  want_access &= ~(thd->master_access | EXTRA_ACL);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3445
  db_access= ((*save_priv=(db_access | thd->master_access)) & want_access);
3446 3447

  /* grant_option is set if there exists a single table or column grant */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3448
  if (db_access == want_access ||
3449
      ((grant_option && !dont_check_global_grants) &&
3450
       !(want_access & ~(db_access | TABLE_ACLS))))
3451
    DBUG_RETURN(FALSE);				/* Ok */
3452
  if (!no_errors)
3453
    net_printf(thd,ER_DBACCESS_DENIED_ERROR,
3454
	       thd->priv_user,
3455
	       thd->priv_host,
3456
	       db ? db : thd->db ? thd->db : "unknown"); /* purecov: tested */
3457
  DBUG_RETURN(TRUE);				/* purecov: tested */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3458 3459 3460
}


3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478
/*
  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
*/
3479 3480

bool check_global_access(THD *thd, ulong want_access)
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
3481
{
3482
  char command[128];
3483
  if ((thd->master_access & want_access))
3484 3485
    return 0;
  get_privilege_desc(command, sizeof(command), want_access);
3486
  net_printf(thd,ER_SPECIFIC_ACCESS_DENIED_ERROR,
3487 3488
	     command);
  return 1;
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
3489 3490 3491
}


bk@work.mysql.com's avatar
bk@work.mysql.com committed
3492
/*
3493 3494
  Check the privilege for all used tables.  Table privileges are cached
  in the table list for GRANT checking
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3495 3496
*/

3497
bool
3498
check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
3499
		   bool no_errors)
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3500
{
3501 3502
  uint found=0;
  ulong found_access=0;
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  TABLE_LIST *org_tables=tables;
  for (; tables ; tables=tables->next)
  {
3506
    if (tables->derived || (tables->table && (int)tables->table->tmp_table))
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3507
      continue;
3508 3509
    if ((thd->master_access & want_access) == (want_access & ~EXTRA_ACL) &&
	thd->db)
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      tables->grant.privilege= want_access;
3511
    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
      {
3517 3518
	if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
			 0, no_errors))
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3519 3520
	  return TRUE;				// Access denied
	found_access=tables->grant.privilege;
3521
	found=1;
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3522 3523
      }
    }
3524
    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
3525
			  0, no_errors))
3526
      return TRUE;
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3527 3528
  }
  if (grant_option)
3529
    return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
3530
		       test(want_access & EXTRA_ACL), no_errors);
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3531 3532 3533
  return FALSE;
}

3534 3535
static bool check_merge_table_access(THD *thd, char *db,
				     TABLE_LIST *table_list)
3536 3537 3538 3539
{
  int error=0;
  if (table_list)
  {
3540
    /* Check that all tables use the current database */
3541 3542
    TABLE_LIST *tmp;
    for (tmp=table_list; tmp ; tmp=tmp->next)
3543 3544 3545 3546
    {
      if (!tmp->db || !tmp->db[0])
	tmp->db=db;
    }
3547
    error=check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
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3548
			     table_list,0);
3549 3550 3551 3552
  }
  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;
}
3570

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3571 3572 3573 3574 3575 3576 3577 3578 3579 3580
/****************************************************************************
	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

3581
#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));
3590
    thd->fatal_error();
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    return 1;
  }
  return 0;
}
3595
#endif /* EMBEDDED_LIBRARY */
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3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629

#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;
}


/****************************************************************************
3630
  Initialize global thd variables needed for query
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3631 3632
****************************************************************************/

3633
void
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3634 3635 3636
mysql_init_query(THD *thd)
{
  DBUG_ENTER("mysql_init_query");
3637 3638 3639
  LEX *lex=&thd->lex;
  lex->unit.init_query();
  lex->unit.init_select();
3640
  lex->unit.thd= thd;
3641 3642 3643
  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;
3646
  lex->unit.prev= lex->unit.link_prev= 0;
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3647
  lex->unit.slave= lex->unit.global_parameters= lex->current_select=
3648
    lex->all_selects_list= &lex->select_lex;
3649 3650
  lex->select_lex.master= &lex->unit;
  lex->select_lex.prev= &lex->unit.slave;
3651
  lex->select_lex.link_next= lex->select_lex.slave= lex->select_lex.next= 0;
3652
  lex->select_lex.link_prev= (st_select_lex_node**)&(lex->all_selects_list);
3653 3654
  lex->describe= 0;
  lex->derived_tables= FALSE;
3655 3656
  lex->lock_option= TL_READ;
  lex->found_colon= 0;
3657
  lex->safe_to_cache_query= 1;
3658
  thd->select_number= lex->select_lex.select_number= 1;
3659
  thd->free_list= 0;
3660
  thd->total_warn_count=0;			// Warnings for this query
3661 3662
  thd->last_insert_id_used= thd->query_start_used= thd->insert_id_used=0;
  thd->sent_row_count= thd->examined_row_count= 0;
3663
  thd->is_fatal_error= thd->rand_used= 0;
3664
  thd->server_status &= ~SERVER_MORE_RESULTS_EXISTS;
3665
  thd->tmp_table_used= 0;
3666 3667
  if (opt_bin_log)
    reset_dynamic(&thd->user_var_events);
3668
  thd->clear_error();
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  DBUG_VOID_RETURN;
}

3672

3673 3674 3675
void
mysql_init_select(LEX *lex)
{
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3676
  SELECT_LEX *select_lex= lex->current_select;
3677
  select_lex->init_select();
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3678
  select_lex->select_limit= lex->thd->variables.select_limit;
3679 3680 3681 3682 3683 3684
  if (select_lex == &lex->select_lex)
  {
    lex->exchange= 0;
    lex->result= 0;
    lex->proc_list.first= 0;
  }
3685 3686
}

3687

3688
bool
3689
mysql_new_select(LEX *lex, bool move_down)
3690
{
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3691
  SELECT_LEX *select_lex = new(&lex->thd->mem_root) SELECT_LEX();
3692 3693
  if (!select_lex)
    return 1;
3694
  select_lex->select_number= ++lex->thd->select_number;
3695 3696 3697 3698 3699
  select_lex->init_query();
  select_lex->init_select();
  if (move_down)
  {
    /* first select_lex of subselect or derived table */
3700
    SELECT_LEX_UNIT *unit= new(&lex->thd->mem_root) SELECT_LEX_UNIT();
3701 3702 3703 3704
    if (!unit)
      return 1;
    unit->init_query();
    unit->init_select();
3705
    unit->thd= lex->thd;
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3706
    unit->include_down(lex->current_select);
3707 3708
    unit->link_next= 0;
    unit->link_prev= 0;
3709
    unit->return_to= lex->current_select;
3710 3711 3712
    select_lex->include_down(unit);
  }
  else
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3713
  {
3714
    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
      */
3723
      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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      fake->resolve_mode= SELECT_LEX::SELECT_MODE;
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    }
  }
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3733

3734
  select_lex->master_unit()->global_parameters= select_lex;
3735
  select_lex->include_global((st_select_lex_node**)&lex->all_selects_list);
3736
  lex->current_select= select_lex;
3737
  select_lex->resolve_mode= SELECT_LEX::SELECT_MODE;
3738
  return 0;
3739
}
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3740

3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755
/*
  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)
{
3756
  THD *thd;
3757
  LEX *lex;
3758
  LEX_STRING tmp, null_lex_string;
3759
  DBUG_ENTER("create_select_for_variable");
3760 3761 3762

  thd= current_thd;
  lex= &thd->lex;
3763 3764 3765 3766
  mysql_init_select(lex);
  lex->sql_command= SQLCOM_SELECT;
  tmp.str= (char*) var_name;
  tmp.length=strlen(var_name);
3767 3768 3769
  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));
3770 3771 3772
  DBUG_VOID_RETURN;
}

3773

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3774 3775
void mysql_init_multi_delete(LEX *lex)
{
3776
  lex->sql_command=  SQLCOM_DELETE_MULTI;
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3777
  mysql_init_select(lex);
3778
  lex->select_lex.select_limit= lex->unit.select_limit_cnt=
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3779
    HA_POS_ERROR;
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3780
  lex->select_lex.table_list.save_and_clear(&lex->auxilliary_table_list);
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}
3782

3783

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3784
void
3785
mysql_parse(THD *thd, char *inBuf, uint length)
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{
  DBUG_ENTER("mysql_parse");

  mysql_init_query(thd);
3790
  if (query_cache_send_result_to_client(thd, inBuf, length) <= 0)
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3791 3792
  {
    LEX *lex=lex_start(thd, (uchar*) inBuf, length);
3793
    if (!yyparse((void *)thd) && ! thd->is_fatal_error)
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3794
    {
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3795
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3796
      if (mqh_used && thd->user_connect &&
3797
	  check_mqh(thd, lex->sql_command))
3798 3799 3800 3801
      {
	thd->net.error = 0;
      }
      else
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3802
#endif
3803
      {
3804 3805 3806 3807 3808
	if (thd->net.report_error)
	  send_error(thd, 0, NullS);
	else
	{
	  mysql_execute_command(thd);
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SCRUM  
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3809
#ifndef EMBEDDED_LIBRARY  /* TODO query cache in embedded library*/
3810
	  query_cache_end_of_result(&thd->net);
3811
#endif
3812
	}
3813
      }
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3814 3815
    }
    else
3816 3817
    {
      DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
3818
			 thd->is_fatal_error));
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SCRUM  
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3819
#ifndef EMBEDDED_LIBRARY   /* TODO query cache in embedded library*/
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      query_cache_abort(&thd->net);
3821
#endif
3822
    }
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3823
    thd->proc_info="freeing items";
3824
    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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3836
bool add_field_to_list(THD *thd, char *field_name, enum_field_types type,
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		       char *length, char *decimals,
3838
		       uint type_modifier,
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		       Item *default_value, LEX_STRING *comment,
3840 3841
		       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;
3846
  char warn_buff[MYSQL_ERRMSG_SIZE];
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  DBUG_ENTER("add_field_to_list");

  if (strlen(field_name) > NAME_LEN)
  {
3851
    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));
3857
    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));
3864
    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();
  }

3869
  if (default_value)
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3870
  {
3871
    if (default_value->type() == Item::NULL_ITEM)
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3872
    {
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      default_value=0;
      if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) ==
	  NOT_NULL_FLAG)
      {
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3877
	net_printf(thd,ER_INVALID_DEFAULT,field_name);
3878 3879 3880 3881 3882
	DBUG_RETURN(1);
      }
    }
    else if (type_modifier & AUTO_INCREMENT_FLAG)
    {
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3883
      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;
3891
  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;
3902
  new_field->charset=cs;
3903
  new_field->geom_type= (Field::geometry_type) uint_geom_type;
3904

3905 3906 3907 3908 3909 3910 3911 3912
  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;
3915
  }
3916 3917
  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 &&
3921
      new_field->length < new_field->decimals+1 &&
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3922
      new_field->decimals != NOT_FIXED_DEC)
3923
    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:
3960
    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",
3965
	    (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:
3973
  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)
      {
4068
	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++)
4077 4078 4079
      {
	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)
      {
4084 4085
	char *not_used;
	uint not_used2;
4086
  bool not_used3;
4087

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	thd->cuted_fields=0;
	String str,*res;
	res=default_value->val_str(&str);
4091
	(void) find_set(interval, res->ptr(), res->length(), &not_used,
4092
			&not_used2, &not_used3);
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	if (thd->cuted_fields)
	{
4095
	  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
4105
      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);
	if (!find_enum(interval,res->ptr(),res->length()))
	{
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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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  {
4132
    net_printf(thd,ER_TOO_BIG_FIELDLENGTH,field_name,
4133
	       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)
  {
4139
    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,
4252
					     LEX_STRING *alias,
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					     ulong table_options,
					     thr_lock_type lock_type,
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					     List<String> *use_index,
					     List<String> *ignore_index)
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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;
4265
  if (check_table_name(table->table.str,table->table.length) ||
4266
      table->db.str && check_db_name(table->db.str))
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  {
4268
    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);
    }
4279
    if (!(alias_str=thd->memdup(alias_str,table->table.length+1)))
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      DBUG_RETURN(0);
4281
  }
4282
  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
  {
4296 4297
    /* 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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4301
  ptr->alias= alias_str;
4302 4303
  if (lower_case_table_names && table->table.length)
    my_casedn_str(files_charset_info, table->table.str);
4304
  ptr->real_name=table->table.str;
4305
  ptr->real_name_length=table->table.length;
4306
  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);
4310
  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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  /* check that used name is unique */
4319
  if (lock_type != TL_IGNORE)
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  {
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    for (TABLE_LIST *tables=(TABLE_LIST*) table_list.first ;
4322
	 tables ;
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	 tables=tables->next)
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    {
4325
      if (!strcmp(alias_str,tables->alias) && !strcmp(ptr->db, tables->db))
4326
      {
4327
	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
*/

4350
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));

4357
  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)
{
4370
  if (expr)
4371
  {
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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();
4380
  }
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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;
}

4407
/*
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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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*/

4427 4428
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 */
4432
  bool tmp_write_to_binlog= 1;
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  if (options & REFRESH_GRANT)
  {
4436
    acl_reload(thd);
4437
    grant_reload(thd);
4438
    if (mqh_used)
4439
      reset_mqh(thd,(LEX_USER *) NULL,true);
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  }
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#endif
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  if (options & REFRESH_LOG)
  {
4444
    /*
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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(&THR_LOCK_keycache);
  pthread_mutex_lock(&LOCK_status);
  for (struct show_var_st *ptr=status_vars; ptr->name; ptr++)
  {
    if (ptr->type == SHOW_LONG)
      *(ulong*) ptr->value=0;
  }
  pthread_mutex_unlock(&LOCK_status);
  pthread_mutex_unlock(&THR_LOCK_keycache);
}
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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))
  {
    my_error(ER_WRONG_TABLE_NAME, MYF(0), *filename_ptr);
    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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compare_func_creator comp_eq_creator(bool invert)
{
  return invert?&Item_bool_func2::ne_creator:&Item_bool_func2::eq_creator;
}

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compare_func_creator comp_ge_creator(bool invert)
{
  return invert?&Item_bool_func2::lt_creator:&Item_bool_func2::ge_creator;
}

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compare_func_creator comp_gt_creator(bool invert)
{
  return invert?&Item_bool_func2::le_creator:&Item_bool_func2::gt_creator;
}

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compare_func_creator comp_le_creator(bool invert)
{
  return invert?&Item_bool_func2::gt_creator:&Item_bool_func2::le_creator;
}

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compare_func_creator comp_lt_creator(bool invert)
{
  return invert?&Item_bool_func2::ge_creator:&Item_bool_func2::lt_creator;
}

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compare_func_creator comp_ne_creator(bool invert)
{
  return invert?&Item_bool_func2::eq_creator:&Item_bool_func2::ne_creator;
}
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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=
    new Item_allany_subselect(left_expr, (*cmp)(all), select_lex);
  if (all)
    return it->upper_not= new Item_func_not_all(it);	/* ALL */

  return it;						/* ANY/SOME */
}