sql_parse.cc 138 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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#include "sp_head.h"
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#include "sp.h"
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#ifdef HAVE_OPENSSL
/*
  Without SSL the handshake consists of one packet. This packet
  has both client capabilites and scrambled password.
  With SSL the handshake might consist of two packets. If the first
  packet (client capabilities) has CLIENT_SSL flag set, we have to
  switch to SSL and read the second packet. The scrambled password
  is in the second packet and client_capabilites field will be ignored.
  Maybe it is better to accept flags other than CLIENT_SSL from the
  second packet?
*/
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#define SSL_HANDSHAKE_SIZE      2
#define NORMAL_HANDSHAKE_SIZE   6
#define MIN_HANDSHAKE_SIZE      2
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#else
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#define MIN_HANDSHAKE_SIZE      6
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#endif /* HAVE_OPENSSL */
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/* Used in error handling only */
#define SP_TYPE_STRING(LP) \
  ((LP)->sphead->m_type == TYPE_ENUM_FUNCTION ? "FUNCTION" : "PROCEDURE")
#define SP_COM_STRING(LP) \
  ((LP)->sql_command == SQLCOM_CREATE_SPFUNCTION || \
   (LP)->sql_command == SQLCOM_ALTER_FUNCTION || \
   (LP)->sql_command == SQLCOM_DROP_FUNCTION ? \
   "FUNCTION" : "PROCEDURE")

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

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

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

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

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

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

      /* Don't allow user to connect if he has done too many queries */
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      if ((ur.questions || ur.updates ||
           ur.connections || max_user_connections) &&
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          get_or_create_user_conn(thd,thd->user,thd->host_or_ip,&ur))
        DBUG_RETURN(1);
      if (thd->user_connect && thd->user_connect->user_resources.connections &&
          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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  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:
  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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  if ((uc->connections && !--uc->connections) && !mqh_used)
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  {
    /* Last connection for user; Delete it */
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    (void) pthread_mutex_lock(&LOCK_user_conn);
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    (void) hash_delete(&hash_user_connections,(byte*) uc);
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    (void) pthread_mutex_unlock(&LOCK_user_conn);
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  }
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  DBUG_VOID_RETURN;
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}

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

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

char  uc_update_queries[SQLCOM_END];

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  pthread_detach_this_thread();

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#if !defined( __WIN__) && !defined(OS2)	// Win32 calls this in pthread_create
  // The following calls needs to be done before we call DBUG_ macros
844
  if (!(test_flags & TEST_NO_THREADS) & my_thread_init())
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  {
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    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
847
    statistic_increment(aborted_connects,&LOCK_status);
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    end_thread(thd,0);
    return 0;
  }
#endif

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

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

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

885
    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 == THD::KILL_CONNECTION))
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    {
      if (do_command(thd))
	break;
    }
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    if (thd->user_connect)
      decrease_user_connections(thd->user_connect);
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    free_root(&thd->mem_root,MYF(0));
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    if (net->error && net->vio != 0 && net->report_error)
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    {
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      if (!thd->killed && thd->variables.log_warnings)
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	sql_print_error(ER(ER_NEW_ABORTING_CONNECTION),
			thd->thread_id,(thd->db ? thd->db : "unconnected"),
			thd->user ? thd->user : "unauthenticated",
			thd->host_or_ip,
			(net->last_errno ? ER(net->last_errno) :
			 ER(ER_UNKNOWN_ERROR)));
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      send_error(thd,net->last_errno,NullS);
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      statistic_increment(aborted_threads,&LOCK_status);
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    }
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    else if (thd->killed)
    {
      statistic_increment(aborted_threads,&LOCK_status);
    }
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end_thread:
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    close_connection(thd, 0, 1);
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    end_thread(thd,1);
    /*
      If end_thread returns, we are either running with --one-thread
      or this thread has been schedule to handle the next query
    */
    thd= current_thd;
  } while (!(test_flags & TEST_NO_THREADS));
  /* The following is only executed if we are not using --one-thread */
  return(0);					/* purecov: deadcode */
}

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#endif /* EMBEDDED_LIBRARY */

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/*
  Execute commands from bootstrap_file.
  Used when creating the initial grant tables
*/
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954
extern "C" pthread_handler_decl(handle_bootstrap,arg)
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{
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  THD *thd=(THD*) arg;
  FILE *file=bootstrap_file;
  char *buff;
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  /* The following must be called before DBUG_ENTER */
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  if (my_thread_init() || thd->store_globals())
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  {
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#ifndef EMBEDDED_LIBRARY
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    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
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#endif
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    thd->fatal_error();
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    goto end;
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  }
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  DBUG_ENTER("handle_bootstrap");

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

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

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

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

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

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


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

  net= &thd->net;
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  /*
    indicator of uninitialized lex => normal flow of errors handling
    (see my_message_sql)
  */
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  thd->lex->current_select= 0;
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  packet=0;
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  old_timeout=net->read_timeout;
  // Wait max for 8 hours
  net->read_timeout=(uint) thd->variables.net_wait_timeout;
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  thd->clear_error();				// Clear error message
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  net_new_transaction(net);
  if ((packet_length=my_net_read(net)) == packet_error)
  {
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    DBUG_PRINT("info",("Got error %d reading command from socket %s",
		       net->error,
		       vio_description(net->vio)));
    /* Check if we can continue without closing the connection */
    if (net->error != 3)
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    {
      statistic_increment(aborted_threads,&LOCK_status);
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      DBUG_RETURN(TRUE);			// We have to close it.
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    }
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    send_error(thd,net->last_errno,NullS);
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    net->error= 0;
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    DBUG_RETURN(FALSE);
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  }
  else
  {
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    if (thd->killed == THD::KILL_QUERY)
      thd->killed= THD::NOT_KILLED;
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    packet=(char*) net->read_pos;
    command = (enum enum_server_command) (uchar) packet[0];
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    if (command >= COM_END)
      command= COM_END;				// Wrong command
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    DBUG_PRINT("info",("Command on %s = %d (%s)",
		       vio_description(net->vio), command,
		       command_name[command]));
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  }
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  net->read_timeout=old_timeout;		// restore it
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  DBUG_RETURN(dispatch_command(command,thd, packet+1, (uint) packet_length));
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}
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#endif  /* EMBEDDED_LIBRARY */
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bool dispatch_command(enum enum_server_command command, THD *thd,
		      char* packet, uint packet_length)
{
  NET *net= &thd->net;
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  bool error= 0;
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  /*
    Commands which will always take a long time should be marked with
    this so that they will not get logged to the slow query log
  */
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  bool slow_command=FALSE;
  DBUG_ENTER("dispatch_command");

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

    statistic_increment(com_other, &LOCK_status);
    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;
  }
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#ifndef EMBEDDED_LIBRARY
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  case COM_CHANGE_USER:
  {
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    thd->change_user();
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    thd->clear_error();                         // if errors from rollback
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    statistic_increment(com_other, &LOCK_status);
    char *user= (char*) packet;
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    char *passwd= strend(user)+1;
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    /* 
      Old clients send null-terminated string ('\0' for empty string) for
      password.  New clients send the size (1 byte) + string (not null
      terminated, so also '\0' for empty string).
    */
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    char db_buff[NAME_LEN+1];                 // buffer to store db in utf8 
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    char *db= passwd;
    uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ? 
      *passwd++ : strlen(passwd);
    db+= passwd_len + 1;
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    /* Small check for incomming packet */
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    if ((uint) ((uchar*) db - net->read_pos) > packet_length)
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    {
      send_error(thd, ER_UNKNOWN_COM_ERROR);
      break;
    }
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    /* Convert database name to utf8 */
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    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
                             system_charset_info, db, strlen(db),
                             thd->charset())]= 0;
    db= db_buff;
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    /* Save user and privileges */
    uint save_master_access= thd->master_access;
    uint save_db_access= thd->db_access;
    uint save_db_length= thd->db_length;
    char *save_user= thd->user;
    char *save_priv_user= thd->priv_user;
    char *save_db= thd->db;
    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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    int res= check_user(thd, COM_CHANGE_USER, passwd, passwd_len, db, false);
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    if (res)
    {
      /* authentification failure, we shall restore old user */
      if (res > 0)
        send_error(thd, ER_UNKNOWN_COM_ERROR);
      x_free(thd->user);
      thd->user= save_user;
      thd->priv_user= save_priv_user;
      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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    break;
  }
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#endif /* EMBEDDED_LIBRARY */
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  case COM_EXECUTE:
  {
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    mysql_stmt_execute(thd, packet);
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    break;
  }
  case COM_LONG_DATA:
  {
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    mysql_stmt_get_longdata(thd, packet, packet_length);
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    break;
  }
  case COM_PREPARE:
  {
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    mysql_stmt_prepare(thd, packet, packet_length);
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    break;
  }
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  case COM_CLOSE_STMT:
  {
    mysql_stmt_free(thd, packet);
    break;
  }
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  case COM_RESET_STMT:
  {
    mysql_stmt_reset(thd, packet);
    break;
  }
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  case COM_QUERY:
  {
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    if (alloc_query(thd, packet, packet_length))
      break;					// fatal error is set
1308
    mysql_log.write(thd,command,"%s",thd->query);
1309
    DBUG_PRINT("query",("%-.4096s",thd->query));
1310
    mysql_parse(thd,thd->query, thd->query_length);
1311

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    while (!thd->killed && !thd->is_fatal_error && thd->lex->found_colon)
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    {
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      char *packet= thd->lex->found_colon;
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      /* 
        Multiple queries exits, execute them individually
      */
      if (thd->lock || thd->open_tables || thd->derived_tables)
        close_thread_tables(thd);		

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

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    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),WAIT_PRIOR);
    DBUG_PRINT("info",("query ready"));
    break;
  }
1342
  case COM_FIELD_LIST:				// This isn't actually needed
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#ifdef DONT_ALLOW_SHOW_COMMANDS
1344
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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    break;
#else
  {
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    char *fields, *pend;
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    TABLE_LIST table_list;
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    LEX_STRING conv_name;

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

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#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,SELECT_ACL,table_list.db,&thd->col_access,0,0))
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      break;
    table_list.grant.privilege=thd->col_access;
    if (grant_option && check_grant(thd,SELECT_ACL,&table_list,2))
      break;
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#endif /*DONT_ALLOW_SHOW_COMMANDS*/
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    mysqld_list_fields(thd,&table_list,fields);
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    free_items(thd->free_list);
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    break;
  }
#endif
  case COM_QUIT:
1386
    /* We don't calculate statistics for this command */
1387
    mysql_log.write(thd,command,NullS);
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    net->error=0;				// Don't give 'abort' message
    error=TRUE;					// End server
    break;

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  case COM_CREATE_DB:				// QQ: To be removed
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    {
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      statistic_increment(com_stat[SQLCOM_CREATE_DB],&LOCK_status);
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      char *db=thd->strdup(packet);
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      // null test to handle EOM
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      if (!db || !strip_sp(db) || check_db_name(db))
1398
      {
1399
	net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
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	break;
      }
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      if (check_access(thd,CREATE_ACL,db,0,1,0))
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	break;
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      mysql_log.write(thd,command,packet);
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      mysql_create_db(thd,db,0,0);
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      break;
    }
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  case COM_DROP_DB:				// QQ: To be removed
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    {
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      statistic_increment(com_stat[SQLCOM_DROP_DB],&LOCK_status);
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      char *db=thd->strdup(packet);
1412
      // null test to handle EOM
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      if (!db || !strip_sp(db) || check_db_name(db))
1414
      {
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	net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
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	break;
      }
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      if (check_access(thd,DROP_ACL,db,0,1,0))
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	break;
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      if (thd->locked_tables || thd->active_transaction())
      {
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	send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
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	break;
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      }
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      mysql_log.write(thd,command,db);
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      mysql_rm_db(thd,db,0,0);
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      break;
    }
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#ifndef EMBEDDED_LIBRARY
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  case COM_BINLOG_DUMP:
    {
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      statistic_increment(com_other,&LOCK_status);
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      slow_command = TRUE;
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      if (check_global_access(thd, REPL_SLAVE_ACL))
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	break;
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      mysql_log.write(thd,command, 0);
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      ulong pos;
      ushort flags;
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      uint32 slave_server_id;
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      /* TODO: The following has to be changed to an 8 byte integer */
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      pos = uint4korr(packet);
      flags = uint2korr(packet + 4);
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      thd->server_id=0; /* avoid suicide */
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      if ((slave_server_id= uint4korr(packet+6))) // mysqlbinlog.server_id==0
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	kill_zombie_dump_threads(slave_server_id);
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      thd->server_id = slave_server_id;
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      mysql_binlog_send(thd, thd->strdup(packet + 10), (my_off_t) pos, flags);
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      unregister_slave(thd,1,1);
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      // fake COM_QUIT -- if we get here, the thread needs to terminate
      error = TRUE;
      net->error = 0;
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      break;
    }
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#endif
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  case COM_REFRESH:
    {
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      statistic_increment(com_stat[SQLCOM_FLUSH],&LOCK_status);
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      ulong options= (ulong) (uchar) packet[0];
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      if (check_global_access(thd,RELOAD_ACL))
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	break;
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      mysql_log.write(thd,command,NullS);
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      if (reload_acl_and_cache(thd, options, (TABLE_LIST*) 0, NULL))
        send_error(thd, 0);
      else
        send_ok(thd);
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      break;
    }
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#ifndef EMBEDDED_LIBRARY
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  case COM_SHUTDOWN:
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    statistic_increment(com_other,&LOCK_status);
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    if (check_global_access(thd,SHUTDOWN_ACL))
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      break; /* purecov: inspected */
    DBUG_PRINT("quit",("Got shutdown command"));
1475
    mysql_log.write(thd,command,NullS);
1476
    send_eof(thd);
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#ifdef __WIN__
    sleep(1);					// must wait after eof()
#endif
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#ifndef OS2
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    send_eof(thd);				// This is for 'quit request'
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#endif
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    close_connection(thd, 0, 1);
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    close_thread_tables(thd);			// Free before kill
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    free_root(&thd->mem_root,MYF(0));
1486
    free_root(&thd->transaction.mem_root,MYF(0));
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    kill_mysql();
    error=TRUE;
    break;
1490
#endif
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  case COM_STATISTICS:
  {
1493
    mysql_log.write(thd,command,NullS);
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    statistic_increment(com_stat[SQLCOM_SHOW_STATUS],&LOCK_status);
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#ifndef EMBEDDED_LIBRARY
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    char buff[200];
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#else
    char *buff= thd->net.last_error;
#endif
1500
    ulong uptime = (ulong) (thd->start_time - start_time);
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    sprintf((char*) buff,
1502
	    "Uptime: %ld  Threads: %d  Questions: %lu  Slow queries: %ld  Opens: %ld  Flush tables: %ld  Open tables: %u  Queries per second avg: %.3f",
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	    uptime,
	    (int) thread_count,thd->query_id,long_query_count,
	    opened_tables,refresh_version, cached_tables(),
	    uptime ? (float)thd->query_id/(float)uptime : 0);
#ifdef SAFEMALLOC
1508
    if (sf_malloc_cur_memory)				// Using SAFEMALLOC
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      sprintf(strend(buff), "  Memory in use: %ldK  Max memory used: %ldK",
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	      (sf_malloc_cur_memory+1023L)/1024L,
	      (sf_malloc_max_memory+1023L)/1024L);
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#endif
#ifndef EMBEDDED_LIBRARY
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    VOID(my_net_write(net, buff,(uint) strlen(buff)));
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    VOID(net_flush(net));
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#endif
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    break;
  }
  case COM_PING:
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    statistic_increment(com_other,&LOCK_status);
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    send_ok(thd);				// Tell client we are alive
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    break;
  case COM_PROCESS_INFO:
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    statistic_increment(com_stat[SQLCOM_SHOW_PROCESSLIST],&LOCK_status);
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
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      break;
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#endif
1529
    mysql_log.write(thd,command,NullS);
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    mysqld_list_processes(thd,
#ifndef NO_EMBEDDED_ACCESS_CHECKS
			  thd->master_access & PROCESS_ACL ? 
			  NullS : thd->priv_user
#else
			  NullS
#endif
			  ,0);
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    break;
  case COM_PROCESS_KILL:
  {
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    statistic_increment(com_stat[SQLCOM_KILL],&LOCK_status);
1542
    ulong id=(ulong) uint4korr(packet);
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    kill_one_thread(thd,id,false);
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    break;
  }
  case COM_DEBUG:
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    statistic_increment(com_other,&LOCK_status);
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    if (check_global_access(thd, SUPER_ACL))
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      break;					/* purecov: inspected */
    mysql_print_status(thd);
1551
    mysql_log.write(thd,command,NullS);
1552
    send_eof(thd);
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    break;
  case COM_SLEEP:
  case COM_CONNECT:				// Impossible here
  case COM_TIME:				// Impossible from client
  case COM_DELAYED_INSERT:
1558
  case COM_END:
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  default:
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    send_error(thd, ER_UNKNOWN_COM_ERROR);
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    break;
  }
1563
  if (thd->lock || thd->open_tables || thd->derived_tables)
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  {
    thd->proc_info="closing tables";
    close_thread_tables(thd);			/* Free tables */
  }

1569
  if (thd->is_fatal_error)
1570
    send_error(thd,0);				// End of memory ?
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  time_t start_of_query=thd->start_time;
1573
  thd->end_time();				// Set start time
1574

1575
  /* If not reading from backup and if the query took too long */
1576
  if (!slow_command && !thd->user_time) // do not log 'slow_command' queries
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  {
1578 1579
    thd->proc_info="logging slow query";

1580 1581
    if ((ulong) (thd->start_time - thd->time_after_lock) >
	thd->variables.long_query_time ||
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	((thd->lex->select_lex.options &
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	  (QUERY_NO_INDEX_USED | QUERY_NO_GOOD_INDEX_USED)) &&
1584
	 (specialflag & SPECIAL_LOG_QUERIES_NOT_USING_INDEXES)))
1585 1586 1587 1588
    {
      long_query_count++;
      mysql_slow_log.write(thd, thd->query, thd->query_length, start_of_query);
    }
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  }
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  thd->proc_info="cleaning up";
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  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For process list
  thd->proc_info=0;
  thd->command=COM_SLEEP;
  thd->query=0;
  thread_running--;
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
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  thd->packet.shrink(thd->variables.net_buffer_length);	// Reclaim some memory
1598

1599
  free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
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  DBUG_RETURN(error);
}

1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620

/*
  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
1621
  /* Remove garbage at start and end of query */
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  while (my_isspace(thd->charset(),packet[0]) && packet_length > 0)
1623 1624 1625 1626 1627
  {
    packet++;
    packet_length--;
  }
  char *pos=packet+packet_length;		// Point at end null
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  while (packet_length > 0 &&
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	 (pos[-1] == ';' || my_isspace(thd->charset() ,pos[-1])))
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  {
    pos--;
    packet_length--;
  }
  /* We must allocate some extra memory for query cache */
  if (!(thd->query= (char*) thd->memdup_w_gap((gptr) (packet),
					      packet_length,
1637 1638
					      thd->db_length+ 1 +
					      QUERY_CACHE_FLAGS_SIZE)))
1639 1640 1641 1642 1643 1644 1645 1646 1647 1648
    return 1;
  thd->query[packet_length]=0;
  thd->query_length= packet_length;
  thd->packet.shrink(thd->variables.net_buffer_length);// Reclaim some memory

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

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

1654
int
1655
mysql_execute_command(THD *thd)
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{
1657
  int	res= 0;
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  LEX	*lex= thd->lex;
1659
  TABLE_LIST *tables= (TABLE_LIST*) lex->select_lex.table_list.first;
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  SELECT_LEX *select_lex= &lex->select_lex;
1661
  SELECT_LEX_UNIT *unit= &lex->unit;
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  DBUG_ENTER("mysql_execute_command");

1664
  if (lex->sql_command != SQLCOM_CREATE_PROCEDURE &&
1665
      lex->sql_command != SQLCOM_CREATE_SPFUNCTION)
1666 1667 1668 1669 1670
  {
    if (sp_cache_functions(thd, lex))
      DBUG_RETURN(-1);
  }

1671 1672 1673 1674 1675 1676
  /*
    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.
  */
1677
  if (tables || &lex->select_lex != lex->all_selects_list)
1678 1679 1680 1681 1682 1683 1684
    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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#ifdef HAVE_REPLICATION
1686 1687
  if (thd->slave_thread)
  {
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    /*
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      Skip if we are in the slave thread, some table rules have been
      given and the table list says the query should not be replicated
    */
    if (table_rules_on && tables && !tables_ok(thd,tables))
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    {
      /* we warn the slave SQL thread */
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
1696
      DBUG_RETURN(0);
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    }
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#ifndef TO_BE_DELETED
    /*
1700 1701 1702
      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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1703
    */
1704 1705 1706
    if (lex->sql_command == SQLCOM_SELECT)
    {
      lex->sql_command = SQLCOM_DO;
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      lex->insert_list = &select_lex->item_list;
1708
    }
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#endif
1710
  }
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#endif /* !HAVE_REPLICATION */
1712
  /*
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    TODO: make derived tables processing 'inside' SELECT processing.
    TODO: solve problem with depended derived tables in subselects
1715
  */
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  if (lex->derived_tables)
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  {
1718 1719 1720
    for (SELECT_LEX *sl= lex->all_selects_list;
	 sl;
	 sl= sl->next_select_in_list())
1721
    {
1722 1723 1724
      for (TABLE_LIST *cursor= sl->get_table_list();
	   cursor;
	   cursor= cursor->next)
1725
      {
1726 1727 1728
	if (cursor->derived && (res=mysql_derived(thd, lex,
						  cursor->derived,
						  cursor)))
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	{
1730 1731
	  if (res < 0 || thd->net.report_error)
	    send_error(thd,thd->killed ? ER_SERVER_SHUTDOWN : 0);
1732
	  DBUG_RETURN(res);
1733
	}
1734 1735
      }
    }
1736
  }
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  if (&lex->select_lex != lex->all_selects_list &&
      lex->unit.create_total_list(thd, lex, &tables, 0))
1739
    DBUG_RETURN(0);
1740 1741 1742 1743 1744 1745
  
  /*
    When option readonly is set deny operations which change tables.
    Except for the replication thread and the 'super' users.
  */
  if (opt_readonly &&
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      !(thd->slave_thread
#ifndef NO_EMBEDDED_ACCESS_CHECKS
	|| (thd->master_access & SUPER_ACL)
#endif
	) &&
1751 1752
      (uc_update_queries[lex->sql_command] > 0))
  {
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    send_error(thd, ER_CANT_UPDATE_WITH_READLOCK);
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    DBUG_RETURN(-1);
1755
  }
1756

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  statistic_increment(com_stat[lex->sql_command],&LOCK_status);
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  switch (lex->sql_command) {
  case SQLCOM_SELECT:
  {
1761
    select_result *result=lex->result;
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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    if (tables)
    {
      res=check_table_access(thd,
			     lex->exchange ? SELECT_ACL | FILE_ACL :
			     SELECT_ACL,
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			     tables,0);
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    }
    else
      res=check_access(thd, lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL,
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		       any_db,0,0,0);
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    if (res)
    {
      res=0;
      break;					// Error message is given
    }
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#endif
1779 1780 1781 1782
    /* 
       In case of single SELECT unit->global_parameters points on first SELECT
       TODO: move counters to SELECT_LEX
    */
1783 1784 1785
    unit->offset_limit_cnt= (ha_rows) unit->global_parameters->offset_limit;
    unit->select_limit_cnt= (ha_rows) (unit->global_parameters->select_limit+
      unit->global_parameters->offset_limit);
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    if (unit->select_limit_cnt <
1787
	(ha_rows) unit->global_parameters->select_limit)
1788
      unit->select_limit_cnt= HA_POS_ERROR;		// no limit
1789
    if (unit->select_limit_cnt == HA_POS_ERROR && !select_lex->next_select())
1790
      select_lex->options&= ~OPTION_FOUND_ROWS;
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    if (!(res=open_and_lock_tables(thd,tables)))
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    {
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      if (lex->describe)
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      {
1796 1797 1798
	if (!(result= new select_send()))
	{
	  send_error(thd, ER_OUT_OF_RESOURCES);
1799
	  goto error;
1800 1801 1802
	}
	else
	  thd->send_explain_fields(result);
1803
	fix_tables_pointers(lex->all_selects_list);
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	res= mysql_explain_union(thd, &thd->lex->unit, result);
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	MYSQL_LOCK *save_lock= thd->lock;
	thd->lock= (MYSQL_LOCK *)0;
1807
	result->send_eof();
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	thd->lock= save_lock;
      }
      else
      {
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	if (!result)
	{
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	  if (!(result=new select_send()))
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	  {
	    res= -1;
#ifdef DELETE_ITEMS
	    delete select_lex->having;
	    delete select_lex->where;
#endif
	    break;
	  }
	}
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	query_cache_store_query(thd, tables);
	res=handle_select(thd, lex, result);
      }
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    }
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    break;
  }
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  case SQLCOM_DO:
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    if (tables && ((res= check_table_access(thd, SELECT_ACL, tables,0)) ||
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		   (res= open_and_lock_tables(thd,tables))))
	break;

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

1842
  case SQLCOM_EMPTY_QUERY:
1843
    send_ok(thd);
1844 1845
    break;

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

1850
#ifndef EMBEDDED_LIBRARY
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1851
  case SQLCOM_PURGE:
1852
  {
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    if (check_global_access(thd, SUPER_ACL))
1854
      goto error;
1855
    // PURGE MASTER LOGS TO 'file'
1856 1857 1858
    res = purge_master_logs(thd, lex->to_log);
    break;
  }
1859 1860 1861 1862 1863 1864 1865 1866
  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;
  }
1867
#endif
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  case SQLCOM_SHOW_WARNS:
  {
1870 1871
    res= mysqld_show_warnings(thd, (ulong)
			      ((1L << (uint) MYSQL_ERROR::WARN_LEVEL_NOTE) |
1872 1873 1874
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_WARN) |
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR)
			       ));
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    break;
  }
  case SQLCOM_SHOW_ERRORS:
  {
1879 1880
    res= mysqld_show_warnings(thd, (ulong)
			      (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR));
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    break;
  }
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  case SQLCOM_SHOW_NEW_MASTER:
  {
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    if (check_global_access(thd, REPL_SLAVE_ACL))
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      goto error;
1887
    /* This query don't work now. See comment in repl_failsafe.cc */
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#ifndef WORKING_NEW_MASTER
1889
    net_printf(thd, ER_NOT_SUPPORTED_YET, "SHOW NEW MASTER");
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    res= 1;
#else
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    res = show_new_master(thd);
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#endif
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    break;
  }
1896

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#ifdef HAVE_REPLICATION
1898 1899
  case SQLCOM_SHOW_SLAVE_HOSTS:
  {
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    if (check_global_access(thd, REPL_SLAVE_ACL))
1901 1902 1903 1904
      goto error;
    res = show_slave_hosts(thd);
    break;
  }
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  case SQLCOM_SHOW_BINLOG_EVENTS:
  {
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    if (check_global_access(thd, REPL_SLAVE_ACL))
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      goto error;
    res = show_binlog_events(thd);
    break;
  }
1912 1913
#endif

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  case SQLCOM_BACKUP_TABLE:
1915 1916
  {
    if (check_db_used(thd,tables) ||
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	check_table_access(thd,SELECT_ACL, tables,0) ||
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	check_global_access(thd, FILE_ACL))
1919 1920
      goto error; /* purecov: inspected */
    res = mysql_backup_table(thd, tables);
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1922 1923
    break;
  }
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  case SQLCOM_RESTORE_TABLE:
1925 1926
  {
    if (check_db_used(thd,tables) ||
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	check_table_access(thd, INSERT_ACL, tables,0) ||
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	check_global_access(thd, FILE_ACL))
1929 1930 1931 1932
      goto error; /* purecov: inspected */
    res = mysql_restore_table(thd, tables);
    break;
  }
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  case SQLCOM_PRELOAD_KEYS:
  {
    if (check_db_used(thd, tables) ||
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	check_access(thd, INDEX_ACL, tables->db, &tables->grant.privilege,0,0))
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      goto error; 
    res = mysql_preload_keys(thd, tables);
    break;
  }
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#ifdef HAVE_REPLICATION
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  case SQLCOM_CHANGE_MASTER:
1943
  {
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    if (check_global_access(thd, SUPER_ACL))
1945
      goto error;
1946 1947 1948
    LOCK_ACTIVE_MI;
    res = change_master(thd,active_mi);
    UNLOCK_ACTIVE_MI;
1949 1950
    break;
  }
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  case SQLCOM_SHOW_SLAVE_STAT:
1952
  {
1953 1954
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
1955
      goto error;
1956 1957 1958
    LOCK_ACTIVE_MI;
    res = show_master_info(thd,active_mi);
    UNLOCK_ACTIVE_MI;
1959 1960
    break;
  }
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1961
  case SQLCOM_SHOW_MASTER_STAT:
1962
  {
1963 1964
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
1965 1966 1967 1968
      goto error;
    res = show_binlog_info(thd);
    break;
  }
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1970
  case SQLCOM_LOAD_MASTER_DATA: // sync with master
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    if (check_global_access(thd, SUPER_ACL))
1972
      goto error;
1973 1974 1975 1976
    if (end_active_trans(thd))
      res= -1;
    else
      res = load_master_data(thd);
1977
    break;
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1978
#endif /* HAVE_REPLICATION */
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#ifdef HAVE_INNOBASE_DB
  case SQLCOM_SHOW_INNODB_STATUS:
    {
1982
      if (check_global_access(thd, SUPER_ACL))
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1983 1984 1985 1986 1987
	goto error;
      res = innodb_show_status(thd);
      break;
    }
#endif
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#ifdef HAVE_REPLICATION
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1989
  case SQLCOM_LOAD_MASTER_TABLE:
1990
  {
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    if (!tables->db)
      tables->db=thd->db;
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,CREATE_ACL,tables->db,&tables->grant.privilege,0,0))
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      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)
2004
	goto error;
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    }
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#endif
2007
    if (strlen(tables->real_name) > NAME_LEN)
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    {
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      net_printf(thd,ER_WRONG_TABLE_NAME,tables->real_name);
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      break;
    }
2012
    LOCK_ACTIVE_MI;
2013 2014 2015 2016
    /*
      fetch_master_table will send the error to the client on failure.
      Give error if the table already exists.
    */
2017
    if (!fetch_master_table(thd, tables->db, tables->real_name,
2018
			    active_mi, 0, 0))
2019
    {
2020
      send_ok(thd);
2021 2022
    }
    UNLOCK_ACTIVE_MI;
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    break;
2024
  }
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2025
#endif /* HAVE_REPLICATION */
2026

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  case SQLCOM_CREATE_TABLE:
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  {
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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    ulong want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
		      CREATE_TMP_ACL : CREATE_ACL);
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#endif
2033 2034
    if (!tables->db)
      tables->db=thd->db;
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,want_priv,tables->db,&tables->grant.privilege,0,0) ||
2037 2038 2039
	check_merge_table_access(thd, tables->db,
				 (TABLE_LIST *)
				 lex->create_info.merge_list.first))
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      goto error;				/* purecov: inspected */
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2041
    if (grant_option && want_priv != CREATE_TMP_ACL)
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    {
      /* Check that the first table has CREATE privilege */
      TABLE_LIST *tmp_table_list=tables->next;
      tables->next=0;
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      bool error=check_grant(thd, want_priv, tables);
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      tables->next=tmp_table_list;
      if (error)
	goto error;
    }
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#endif
2052
    if (strlen(tables->real_name) > NAME_LEN)
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2053
    {
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      net_printf(thd, ER_WRONG_TABLE_NAME, tables->alias);
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      res=0;
      break;
    }
2058 2059 2060
#ifndef HAVE_READLINK
    lex->create_info.data_file_name=lex->create_info.index_file_name=0;
#else
2061
    /* Fix names if symlinked tables */
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    if (append_file_to_dir(thd, &lex->create_info.data_file_name,
2063
			   tables->real_name) ||
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	append_file_to_dir(thd,&lex->create_info.index_file_name,
2065
			   tables->real_name))
2066 2067 2068 2069
    {
      res=-1;
      break;
    }
2070
#endif
2071
    if (select_lex->item_list.elements)		// With select
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    {
      select_result *result;

      if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
2076
	  find_real_table_in_list(tables->next, tables->db, tables->real_name))
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      {
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	net_printf(thd,ER_UPDATE_TABLE_USED,tables->real_name);
2079
	DBUG_RETURN(-1);
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      }
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2081
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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2082 2083
      if (tables->next)
      {
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	if (check_table_access(thd, SELECT_ACL, tables->next,0))
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	  goto error;				// Error message is given
      }
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#endif
2088
      select_lex->options|= SELECT_NO_UNLOCK;
2089 2090 2091 2092 2093
      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
2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109

      /* 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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    else // regular create
    {
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      if (lex->name)
        res= mysql_create_like_table(thd, tables, &lex->create_info, 
                                     (Table_ident *)lex->name); 
      else
2116
      {
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        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
2121
      }
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2122
      if (!res)
2123
	send_ok(thd);
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2124 2125
    }
    break;
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  }
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2127 2128 2129
  case SQLCOM_CREATE_INDEX:
    if (!tables->db)
      tables->db=thd->db;
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2130 2131
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,INDEX_ACL,tables->db,&tables->grant.privilege,0,0))
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      goto error; /* purecov: inspected */
    if (grant_option && check_grant(thd,INDEX_ACL,tables))
      goto error;
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#endif
2136 2137 2138 2139
    if (end_active_trans(thd))
      res= -1;
    else
      res = mysql_create_index(thd, tables, lex->key_list);
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    break;

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#ifdef HAVE_REPLICATION
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  case SQLCOM_SLAVE_START:
2144 2145 2146 2147
  {
    LOCK_ACTIVE_MI;
    start_slave(thd,active_mi,1 /* net report*/);
    UNLOCK_ACTIVE_MI;
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    break;
2149
  }
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2150
  case SQLCOM_SLAVE_STOP:
2151 2152 2153 2154 2155 2156
  /*
    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,
2157
      so it waits for the client thread because t is locked by it.
2158
    - then the client thread does SLAVE STOP.
2159 2160
      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.
2161 2162 2163 2164 2165
    To prevent that, refuse SLAVE STOP if the
    client thread has locked tables
  */
  if (thd->locked_tables || thd->active_transaction())
  {
2166
    send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
2167
    goto error;
2168
  }
2169 2170 2171 2172
  {
    LOCK_ACTIVE_MI;
    stop_slave(thd,active_mi,1/* net report*/);
    UNLOCK_ACTIVE_MI;
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    break;
2174
  }
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2175
#endif /* HAVE_REPLICATION */
2176

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2177 2178
  case SQLCOM_ALTER_TABLE:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
2179
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
2180
    goto error;
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2181 2182
#else
    {
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      ulong priv=0;
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      if (lex->name && (!lex->name[0] || strlen(lex->name) > NAME_LEN))
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2185
      {
2186
	net_printf(thd,ER_WRONG_TABLE_NAME,lex->name);
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2187 2188 2189
	res=0;
	break;
      }
2190 2191
      if (!tables->db)
	tables->db=thd->db;
2192 2193
      if (!select_lex->db)
	select_lex->db=tables->db;
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2194 2195
      if (check_access(thd,ALTER_ACL,tables->db,&tables->grant.privilege,0,0) ||
	  check_access(thd,INSERT_ACL | CREATE_ACL,select_lex->db,&priv,0,0)||
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	  check_merge_table_access(thd, tables->db,
2197 2198 2199
				   (TABLE_LIST *)
				   lex->create_info.merge_list.first))
	goto error;				/* purecov: inspected */
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2200 2201
      if (!tables->db)
	tables->db=thd->db;
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2202
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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2203 2204 2205 2206 2207 2208 2209 2210 2211
      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;
2212
	  tmp_table.db=select_lex->db;
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2213 2214 2215 2216 2217
	  tmp_table.grant.privilege=priv;
	  if (check_grant(thd,INSERT_ACL | CREATE_ACL,tables))
	    goto error;
	}
      }
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#endif
2219 2220
      /* Don't yet allow changing of symlinks with ALTER TABLE */
      lex->create_info.data_file_name=lex->create_info.index_file_name=0;
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      /* ALTER TABLE ends previous transaction */
2222
      if (end_active_trans(thd))
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	res= -1;
      else
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2225
      {
2226
	res= mysql_alter_table(thd, select_lex->db, lex->name,
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2227 2228 2229
			       &lex->create_info,
			       tables, lex->create_list,
			       lex->key_list, lex->drop_list, lex->alter_list,
2230
			       select_lex->order_list.elements,
2231
                               (ORDER *) select_lex->order_list.first,
2232
			       lex->drop_primary, lex->duplicates,
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2233 2234 2235
			       lex->alter_keys_onoff,
                               lex->tablespace_op,
			       lex->simple_alter);
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      }
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      break;
    }
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2239
#endif /*DONT_ALLOW_SHOW_COMMANDS*/
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2240
  case SQLCOM_RENAME_TABLE:
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2241 2242 2243
  {
    TABLE_LIST *table;
    if (check_db_used(thd,tables))
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2244
      goto error;
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2245
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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2246 2247
    for (table=tables ; table ; table=table->next->next)
    {
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      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
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2249
		       &table->grant.privilege,0,0) ||
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	  check_access(thd, INSERT_ACL | CREATE_ACL, table->next->db,
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2251
		       &table->next->grant.privilege,0,0))
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	goto error;
      if (grant_option)
      {
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2255 2256 2257 2258 2259
	TABLE_LIST old_list,new_list;
	old_list=table[0];
	new_list=table->next[0];
	old_list.next=new_list.next=0;
	if (check_grant(thd,ALTER_ACL,&old_list) ||
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	    (!test_all_bits(table->next->grant.privilege,
2261
			    INSERT_ACL | CREATE_ACL) &&
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2262
	     check_grant(thd,INSERT_ACL | CREATE_ACL, &new_list)))
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	  goto error;
      }
    }
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#endif
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    query_cache_invalidate3(thd, tables, 0);
2268 2269 2270
    if (end_active_trans(thd))
      res= -1;
    else if (mysql_rename_tables(thd,tables))
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      res= -1;
    break;
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  }
2274
#ifndef EMBEDDED_LIBRARY
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2275 2276
  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2277
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
2278
    goto error;
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#else
    {
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      if (check_global_access(thd, SUPER_ACL))
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	goto error;
      res = show_binlogs(thd);
      break;
    }
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#endif
2287
#endif /* EMBEDDED_LIBRARY */
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  case SQLCOM_SHOW_CREATE:
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2289
#ifdef DONT_ALLOW_SHOW_COMMANDS
2290
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
2291
    goto error;
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2292
#else
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2293
    {
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      if (check_db_used(thd, tables) ||
	  check_access(thd, SELECT_ACL | EXTRA_ACL, tables->db,
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2296
		       &tables->grant.privilege,0,0))
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2297
	goto error;
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      res = mysqld_show_create(thd, tables);
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      break;
    }
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#endif
2302 2303 2304
  case SQLCOM_CHECKSUM:
  {
    if (check_db_used(thd,tables) ||
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2305
	check_table_access(thd, SELECT_ACL | EXTRA_ACL , tables,0))
2306
      goto error; /* purecov: inspected */
2307
    res = mysql_checksum_table(thd, tables, &lex->check_opt);
2308 2309
    break;
  }
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  case SQLCOM_REPAIR:
2311 2312
  {
    if (check_db_used(thd,tables) ||
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	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables,0))
2314 2315
      goto error; /* purecov: inspected */
    res = mysql_repair_table(thd, tables, &lex->check_opt);
2316 2317 2318 2319 2320 2321 2322 2323 2324
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      if (mysql_bin_log.is_open())
      {
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
        mysql_bin_log.write(&qinfo);
      }
    }
2325 2326
    break;
  }
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  case SQLCOM_CHECK:
2328 2329
  {
    if (check_db_used(thd,tables) ||
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2330
 	check_table_access(thd, SELECT_ACL | EXTRA_ACL , tables,0))
2331 2332 2333 2334
      goto error; /* purecov: inspected */
    res = mysql_check_table(thd, tables, &lex->check_opt);
    break;
  }
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  case SQLCOM_ANALYZE:
  {
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    if (check_db_used(thd,tables) ||
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2338
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables,0))
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      goto error; /* purecov: inspected */
2340
    res = mysql_analyze_table(thd, tables, &lex->check_opt);
2341 2342 2343 2344 2345 2346 2347 2348 2349
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      if (mysql_bin_log.is_open())
      {
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
        mysql_bin_log.write(&qinfo);
      }
    }
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    break;
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2351
  }
2352

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  case SQLCOM_OPTIMIZE:
  {
    HA_CREATE_INFO create_info;
2356
    if (check_db_used(thd,tables) ||
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2357
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables,0))
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      goto error; /* purecov: inspected */
2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369
    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;
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      create_info.table_charset=default_charset_info;
2371 2372 2373
      res= mysql_alter_table(thd, NullS, NullS, &create_info,
			     tables, lex->create_list,
			     lex->key_list, lex->drop_list, lex->alter_list,
2374 2375
                             0, (ORDER *) 0,
			     0, DUP_ERROR);
2376 2377 2378
    }
    else
      res = mysql_optimize_table(thd, tables, &lex->check_opt);
2379 2380 2381 2382 2383 2384 2385 2386 2387
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      if (mysql_bin_log.is_open())
      {
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
        mysql_bin_log.write(&qinfo);
      }
    }
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    break;
  }
  case SQLCOM_UPDATE:
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    if (check_db_used(thd,tables))
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      goto error;
2393

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    if (single_table_command_access(thd, UPDATE_ACL, tables, &res))
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	goto error;
2396
    if (select_lex->item_list.elements != lex->value_list.elements)
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    {
2398
      send_error(thd,ER_WRONG_VALUE_COUNT);
2399
      goto error;
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    }
2401 2402 2403 2404
    res= mysql_update(thd,tables,
                      select_lex->item_list,
                      lex->value_list,
                      select_lex->where,
2405
		      select_lex->order_list.elements,
2406 2407 2408
                      (ORDER *) select_lex->order_list.first,
                      select_lex->select_limit,
                      lex->duplicates);
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    if (thd->net.report_error)
      res= -1;
2411 2412
    break;
  case SQLCOM_UPDATE_MULTI:
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,UPDATE_ACL,tables->db,&tables->grant.privilege,0,0))
2415 2416 2417
      goto error;
    if (grant_option && check_grant(thd,UPDATE_ACL,tables))
      goto error;
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#endif
2419
    if (select_lex->item_list.elements != lex->value_list.elements)
2420
    {
2421
      send_error(thd,ER_WRONG_VALUE_COUNT);
2422
      goto error;
2423 2424
    }
    {
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2425
      const char *msg= 0;
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2426
      if (select_lex->order_list.elements)
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	msg= "ORDER BY";
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      else if (select_lex->select_limit && select_lex->select_limit !=
	       HA_POS_ERROR)
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	msg= "LIMIT";
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      if (msg)
2432
      {
2433
	net_printf(thd, ER_WRONG_USAGE, "UPDATE", msg);
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	res= 1;
	break;
2436
      }
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      res= mysql_multi_update(thd,tables,
			      &select_lex->item_list,
			      &lex->value_list,
			      select_lex->where,
			      select_lex->options,
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2442
			      lex->duplicates, unit, select_lex);
2443
    }
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    break;
  case SQLCOM_REPLACE:
2446 2447
  case SQLCOM_INSERT:
  {
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2448
#ifndef NO_EMBEDDED_ACCESS_CHECKS
2449
    my_bool update=(lex->value_list.elements ? UPDATE_ACL : 0);
2450
    ulong privilege= (lex->duplicates == DUP_REPLACE ?
2451
                      INSERT_ACL | DELETE_ACL : INSERT_ACL | update);
2452

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2453
    if (single_table_command_access(thd, privilege, tables, &res))
2454
	goto error;
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#else
    my_bool update=(lex->value_list.elements ? 1 : 0);
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#endif
2458 2459 2460
    if (select_lex->item_list.elements != lex->value_list.elements)
    {
      send_error(thd,ER_WRONG_VALUE_COUNT);
2461
      goto error;
2462
    }
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    res = mysql_insert(thd,tables,lex->field_list,lex->many_values,
2464
                       select_lex->item_list, lex->value_list,
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2465
                       (update ? DUP_UPDATE : lex->duplicates));
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    if (thd->net.report_error)
      res= -1;
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    break;
2469
  }
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  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
2473

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    /*
      Check that we have modify privileges for the first table and
      select privileges for the rest
    */
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
2479
    {
2480 2481
      ulong privilege= (lex->duplicates == DUP_REPLACE ?
                        INSERT_ACL | DELETE_ACL : INSERT_ACL);
2482 2483 2484
      TABLE_LIST *save_next=tables->next;
      tables->next=0;
      if (check_access(thd, privilege,
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2485
		       tables->db,&tables->grant.privilege,0,0) ||
2486 2487
	  (grant_option && check_grant(thd, privilege, tables)))
	goto error;
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2489
      tables->next=save_next;
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2490
      if ((res=check_table_access(thd, SELECT_ACL, save_next,0)))
2491 2492
	goto error;
    }
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#endif
2494 2495
    /* Don't unlock tables until command is written to binary log */
    select_lex->options|= SELECT_NO_UNLOCK;
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    select_result *result;
2498 2499 2500 2501
    unit->offset_limit_cnt= select_lex->offset_limit;
    unit->select_limit_cnt= select_lex->select_limit+select_lex->offset_limit;
    if (unit->select_limit_cnt < select_lex->select_limit)
      unit->select_limit_cnt= HA_POS_ERROR;		// No limit
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2502

2503
    if (find_real_table_in_list(tables->next, tables->db, tables->real_name))
2504
    {
2505 2506
      /* Using same table for INSERT and SELECT */
      select_lex->options |= OPTION_BUFFER_RESULT;
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    }
2508 2509 2510 2511

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

2514 2515 2516
    if (!(res=open_and_lock_tables(thd, tables)))
    {
      if ((result=new select_insert(tables->table,&lex->field_list,
2517
				    lex->duplicates)))
2518
	res=handle_select(thd,lex,result);
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      if (thd->net.report_error)
	res= -1;
2521 2522 2523
    }
    else
      res= -1;
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    break;
  }
2526
  case SQLCOM_TRUNCATE:
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2527 2528
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,DELETE_ACL,tables->db,&tables->grant.privilege,0,0))
2529
      goto error; /* purecov: inspected */
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    if (grant_option && check_grant(thd,DELETE_ACL,tables))
      goto error;
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#endif
2533 2534 2535 2536 2537 2538
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
    if (thd->locked_tables || thd->active_transaction())
    {
2539
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION,NullS);
2540 2541 2542 2543
      goto error;
    }
    res=mysql_truncate(thd,tables);
    break;
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  case SQLCOM_DELETE:
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2545
  {
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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    if (single_table_command_access(thd, DELETE_ACL, tables, &res))
      goto error;
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    // Set privilege for the WHERE clause
    tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
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#endif
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    res = mysql_delete(thd,tables, select_lex->where,
                       (ORDER*) select_lex->order_list.first,
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2554
                       select_lex->select_limit, select_lex->options);
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    if (thd->net.report_error)
      res= -1;
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2557 2558
    break;
  }
2559
  case SQLCOM_DELETE_MULTI:
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2560
  {
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    TABLE_LIST *aux_tables=(TABLE_LIST *)thd->lex->auxilliary_table_list.first;
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    TABLE_LIST *auxi;
    uint table_count=0;
    multi_delete *result;
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2565

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2566 2567
    /* sql_yacc guarantees that tables and aux_tables are not zero */
    if (check_db_used(thd, tables) || check_db_used(thd,aux_tables) ||
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2568 2569
	check_table_access(thd,SELECT_ACL, tables,0) ||
	check_table_access(thd,DELETE_ACL, aux_tables,0))
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      goto error;
    if ((thd->options & OPTION_SAFE_UPDATES) && !select_lex->where)
2572
    {
2573
      send_error(thd,ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE);
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2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588
      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)
      {
2589
	net_printf(thd,ER_NONUNIQ_TABLE,auxi->real_name);
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	goto error;
      }
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2592
      walk->lock_type= auxi->lock_type;
2593
      auxi->table_list=  walk;		// Remember corresponding table
2594
    }
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2595
    if (add_item_to_list(thd, new Item_null()))
2596
    {
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2597
      res= -1;
2598
      break;
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2599 2600 2601 2602 2603 2604
    }
    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)
2605
      auxi->table= auxi->table_list->table;
2606
    if (&lex->select_lex != lex->all_selects_list)
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2607
    {
2608 2609 2610 2611 2612
      for (TABLE_LIST *t= select_lex->get_table_list();
	   t; t= t->next)
      {
	if (find_real_table_in_list(t->table_list->next, t->db, t->real_name))
	{
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2613
	  my_error(ER_UPDATE_TABLE_USED, MYF(0), t->real_name);
2614 2615 2616 2617
	  res= -1;
	  break;
	}
      }
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2618
    }
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2619
    fix_tables_pointers(lex->all_selects_list);
2620 2621
    if (!thd->is_fatal_error && (result= new multi_delete(thd,aux_tables,
							  table_count)))
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2622
    {
2623 2624 2625
      res= mysql_select(thd, &select_lex->ref_pointer_array,
			select_lex->get_table_list(),
			select_lex->with_wild,
2626
			select_lex->item_list,
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2627
			select_lex->where,
2628
			0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
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2629 2630
			(ORDER *)NULL,
			select_lex->options | thd->options |
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2631
			SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK,
2632
			result, unit, select_lex, 0);
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2633 2634
      if (thd->net.report_error)
	res= -1;
2635
      delete result;
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    }
    else
      res= -1;					// Error is not sent
    close_thread_tables(thd);
    break;
  }
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  case SQLCOM_DROP_TABLE:
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2643
  {
2644 2645
    if (!lex->drop_temporary)
    {
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2646
      if (check_table_access(thd,DROP_ACL,tables,0))
2647 2648 2649 2650 2651 2652 2653
	goto error;				/* purecov: inspected */
      if (end_active_trans(thd))
      {
	res= -1;
	break;
      }
    }
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2654
    else
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    {
      /*
	If this is a slave thread, we may sometimes execute some 
	DROP / * 40005 TEMPORARY * / TABLE
	that come from parts of binlogs (likely if we use RESET SLAVE or CHANGE
	MASTER TO), while the temporary table has already been dropped.
	To not generate such irrelevant "table does not exist errors", we
	silently add IF EXISTS if TEMPORARY was used.
      */
      if (thd->slave_thread)
	lex->drop_if_exists= 1;
    }
2667
    res= mysql_rm_table(thd,tables,lex->drop_if_exists, lex->drop_temporary);
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2668 2669
  }
  break;
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2670 2671 2672
  case SQLCOM_DROP_INDEX:
    if (!tables->db)
      tables->db=thd->db;
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2673 2674
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,INDEX_ACL,tables->db,&tables->grant.privilege,0,0))
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      goto error;				/* purecov: inspected */
    if (grant_option && check_grant(thd,INDEX_ACL,tables))
      goto error;
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2678
#endif
2679 2680 2681 2682
    if (end_active_trans(thd))
      res= -1;
    else
      res = mysql_drop_index(thd, tables, lex->drop_list);
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2683 2684
    break;
  case SQLCOM_SHOW_DATABASES:
2685
#if defined(DONT_ALLOW_SHOW_COMMANDS)
2686
    send_error(thd,ER_NOT_ALLOWED_COMMAND);   /* purecov: inspected */
2687
    goto error;
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2688 2689
#else
    if ((specialflag & SPECIAL_SKIP_SHOW_DB) &&
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2690
	check_global_access(thd, SHOW_DB_ACL))
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2691 2692 2693 2694 2695
      goto error;
    res= mysqld_show_dbs(thd, (lex->wild ? lex->wild->ptr() : NullS));
    break;
#endif
  case SQLCOM_SHOW_PROCESSLIST:
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2696
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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2697
    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
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2698
      break;
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2699
#endif
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2700 2701 2702 2703 2704 2705 2706 2707
    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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2708
    break;
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2709 2710 2711 2712 2713 2714 2715 2716 2717
  case SQLCOM_SHOW_TABLE_TYPES:
    res= mysqld_show_table_types(thd);
    break;
  case SQLCOM_SHOW_PRIVILEGES:
    res= mysqld_show_privileges(thd);
    break;
  case SQLCOM_SHOW_COLUMN_TYPES:
    res= mysqld_show_column_types(thd);
    break;
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2718
  case SQLCOM_SHOW_STATUS:
2719
    res= mysqld_show(thd,(lex->wild ? lex->wild->ptr() : NullS),status_vars,
2720
		     OPT_GLOBAL, &LOCK_status);
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2721 2722 2723
    break;
  case SQLCOM_SHOW_VARIABLES:
    res= mysqld_show(thd, (lex->wild ? lex->wild->ptr() : NullS),
2724 2725
		     init_vars, lex->option_type,
		     &LOCK_global_system_variables);
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2726
    break;
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2727 2728
  case SQLCOM_SHOW_LOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2729
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
2730
    goto error;
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2731 2732
#else
    {
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2733 2734
#ifndef NO_EMBEDDED_ACCESS_CHECKS
      if (grant_option && check_access(thd, FILE_ACL, any_db,0,0,0))
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2735
	goto error;
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2736
#endif
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2737 2738 2739 2740
      res= mysqld_show_logs(thd);
      break;
    }
#endif
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2741
  case SQLCOM_SHOW_TABLES:
2742
    /* FALL THROUGH */
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2743
#ifdef DONT_ALLOW_SHOW_COMMANDS
2744
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
2745
    goto error;
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2746 2747
#else
    {
2748
      char *db=select_lex->db ? select_lex->db : thd->db;
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2749 2750
      if (!db)
      {
2751
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
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2752 2753 2754
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);				// Fix escaped '_'
2755
      if (check_db_name(db))
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unknown committed
2756
      {
2757
        net_printf(thd,ER_WRONG_DB_NAME, db);
2758
        goto error;
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2759
      }
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2760 2761
#ifndef NO_EMBEDDED_ACCESS_CHECKS
      if (check_access(thd,SELECT_ACL,db,&thd->col_access,0,0))
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2762
	goto error;				/* purecov: inspected */
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2763
      if (!thd->col_access && check_grant_db(thd,db))
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2764
      {
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2765
	net_printf(thd, ER_DBACCESS_DENIED_ERROR,
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2766 2767 2768 2769 2770
		   thd->priv_user,
		   thd->priv_host,
		   db);
	goto error;
      }
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2771
#endif
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2772
      /* grant is checked in mysqld_show_tables */
2773
      if (select_lex->options & SELECT_DESCRIBE)
2774
        res= mysqld_extend_show_tables(thd,db,
2775
				       (lex->wild ? lex->wild->ptr() : NullS));
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      else
	res= mysqld_show_tables(thd,db,
				(lex->wild ? lex->wild->ptr() : NullS));
      break;
    }
#endif
2782 2783 2784
  case SQLCOM_SHOW_OPEN_TABLES:
    res= mysqld_show_open_tables(thd,(lex->wild ? lex->wild->ptr() : NullS));
    break;
2785 2786
  case SQLCOM_SHOW_CHARSETS:
    res= mysqld_show_charsets(thd,(lex->wild ? lex->wild->ptr() : NullS));
2787
    break;
2788 2789 2790
  case SQLCOM_SHOW_COLLATIONS:
    res= mysqld_show_collations(thd,(lex->wild ? lex->wild->ptr() : NullS));
    break;
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2791 2792
  case SQLCOM_SHOW_FIELDS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2793
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
2794
    goto error;
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2795 2796
#else
    {
2797 2798
      char *db=tables->db;
      if (!*db)
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2799
      {
2800
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
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	goto error;				/* purecov: inspected */
      }
      remove_escape(db);			// Fix escaped '_'
2804
      remove_escape(tables->real_name);
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
      if (check_access(thd,SELECT_ACL | EXTRA_ACL,db,&thd->col_access,0,0))
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	goto error;				/* purecov: inspected */
      tables->grant.privilege=thd->col_access;
      if (grant_option && check_grant(thd,SELECT_ACL,tables,2))
	goto error;
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2811
#endif
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2812
      res= mysqld_show_fields(thd,tables,
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2813 2814
			      (lex->wild ? lex->wild->ptr() : NullS),
			      lex->verbose);
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      break;
    }
#endif
  case SQLCOM_SHOW_KEYS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2820
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
2821
    goto error;
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2822 2823
#else
    {
2824
      char *db=tables->db;
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2825 2826
      if (!db)
      {
2827
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
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	goto error;				/* purecov: inspected */
      }
      remove_escape(db);			// Fix escaped '_'
2831
      remove_escape(tables->real_name);
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      if (!tables->db)
	tables->db=thd->db;
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2834 2835
#ifndef NO_EMBEDDED_ACCESS_CHECKS
      if (check_access(thd,SELECT_ACL,db,&thd->col_access,0,0))
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	goto error; /* purecov: inspected */
      tables->grant.privilege=thd->col_access;
      if (grant_option && check_grant(thd,SELECT_ACL,tables,2))
	goto error;
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#endif
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      res= mysqld_show_keys(thd,tables);
      break;
    }
#endif
  case SQLCOM_CHANGE_DB:
2846
    mysql_change_db(thd,select_lex->db);
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2847
    break;
2848

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2849 2850
  case SQLCOM_LOAD:
  {
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2851
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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2852
    uint privilege= (lex->duplicates == DUP_REPLACE ?
2853
		     INSERT_ACL | DELETE_ACL : INSERT_ACL);
2854 2855

    if (!lex->local_file)
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2856
    {
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2857
      if (check_access(thd,privilege | FILE_ACL,tables->db,0,0,0))
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	goto error;
    }
    else
    {
2862
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
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2863
	  ! opt_local_infile)
2864
      {
2865
	send_error(thd,ER_NOT_ALLOWED_COMMAND);
2866 2867
	goto error;
      }
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2868
      if (check_access(thd,privilege,tables->db,&tables->grant.privilege,0,0) ||
2869
	  grant_option && check_grant(thd,privilege,tables))
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	goto error;
    }
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2872
#endif /*NO_EMBEDDED_ACCESS_CHECKS*/
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2873 2874 2875 2876
    res=mysql_load(thd, lex->exchange, tables, lex->field_list,
		   lex->duplicates, (bool) lex->local_file, lex->lock_option);
    break;
  }
2877

unknown's avatar
unknown committed
2878
  case SQLCOM_SET_OPTION:
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2879
    if (tables && ((res= check_table_access(thd, SELECT_ACL, tables,0)) ||
unknown's avatar
unknown committed
2880 2881 2882 2883
		   (res= open_and_lock_tables(thd,tables))))
      break;
    fix_tables_pointers(lex->all_selects_list);
    if (!(res= sql_set_variables(thd, &lex->var_list)))
2884
      send_ok(thd);
unknown's avatar
unknown committed
2885 2886
    if (thd->net.report_error)
      res= -1;
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unknown committed
2887
    break;
unknown's avatar
unknown committed
2888

unknown's avatar
unknown committed
2889
  case SQLCOM_UNLOCK_TABLES:
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unknown committed
2890
    unlock_locked_tables(thd);
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unknown committed
2891 2892
    if (thd->options & OPTION_TABLE_LOCK)
    {
unknown's avatar
unknown committed
2893
      end_active_trans(thd);
unknown's avatar
unknown committed
2894
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
unknown's avatar
unknown committed
2895 2896
    }
    if (thd->global_read_lock)
2897
      unlock_global_read_lock(thd);
2898
    send_ok(thd);
unknown's avatar
unknown committed
2899 2900
    break;
  case SQLCOM_LOCK_TABLES:
unknown's avatar
unknown committed
2901
    unlock_locked_tables(thd);
2902
    if (check_db_used(thd,tables) || end_active_trans(thd))
unknown's avatar
unknown committed
2903
      goto error;
unknown's avatar
unknown committed
2904
    if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, tables,0))
2905
      goto error;
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unknown committed
2906
    thd->in_lock_tables=1;
unknown's avatar
unknown committed
2907
    thd->options|= OPTION_TABLE_LOCK;
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unknown committed
2908 2909 2910 2911
    if (!(res=open_and_lock_tables(thd,tables)))
    {
      thd->locked_tables=thd->lock;
      thd->lock=0;
2912
      send_ok(thd);
unknown's avatar
unknown committed
2913
    }
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unknown committed
2914 2915
    else
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
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2916 2917 2918
    thd->in_lock_tables=0;
    break;
  case SQLCOM_CREATE_DB:
2919
  {
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unknown committed
2920
    if (!strip_sp(lex->name) || check_db_name(lex->name))
unknown's avatar
unknown committed
2921
    {
2922
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
unknown's avatar
unknown committed
2923 2924
      break;
    }
2925 2926 2927 2928 2929 2930 2931
    /*
      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.
    */
2932
#ifdef HAVE_REPLICATION
2933 2934 2935
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
unknown's avatar
unknown committed
2936 2937
    {
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
2938
      break;
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unknown committed
2939
    }
2940
#endif
unknown's avatar
unknown committed
2941
    if (check_access(thd,CREATE_ACL,lex->name,0,1,0))
2942
      break;
2943
    res=mysql_create_db(thd,lex->name,&lex->create_info,0);
2944 2945
    break;
  }
unknown's avatar
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2946
  case SQLCOM_DROP_DB:
2947
  {
unknown's avatar
unknown committed
2948
    if (!strip_sp(lex->name) || check_db_name(lex->name))
unknown's avatar
unknown committed
2949
    {
2950
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
unknown's avatar
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2951 2952
      break;
    }
2953 2954 2955 2956 2957 2958 2959
    /*
      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.
    */
2960
#ifdef HAVE_REPLICATION
2961 2962 2963
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
unknown's avatar
unknown committed
2964 2965
    {
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
2966
      break;
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unknown committed
2967
    }
2968
#endif
unknown's avatar
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2969
    if (check_access(thd,DROP_ACL,lex->name,0,1,0))
2970
      break;
2971 2972
    if (thd->locked_tables || thd->active_transaction())
    {
2973
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
2974 2975
      goto error;
    }
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2976
    res=mysql_rm_db(thd,lex->name,lex->drop_if_exists,0);
2977 2978
    break;
  }
2979 2980 2981 2982
  case SQLCOM_ALTER_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
2983
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
2984 2985
      break;
    }
unknown's avatar
unknown committed
2986
    if (check_access(thd,ALTER_ACL,lex->name,0,1,0))
2987 2988 2989
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
2990
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
2991 2992
      goto error;
    }
2993
    res=mysql_alter_db(thd,lex->name,&lex->create_info);
2994 2995
    break;
  }
unknown's avatar
unknown committed
2996 2997 2998 2999
  case SQLCOM_SHOW_CREATE_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
3000
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
unknown's avatar
unknown committed
3001 3002
      break;
    }
unknown's avatar
unknown committed
3003
    if (check_access(thd,DROP_ACL,lex->name,0,1,0))
unknown's avatar
unknown committed
3004 3005 3006
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
3007
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
unknown's avatar
unknown committed
3008 3009
      goto error;
    }
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unknown committed
3010
    res=mysqld_show_create_db(thd,lex->name,&lex->create_info);
unknown's avatar
unknown committed
3011 3012
    break;
  }
3013 3014
  case SQLCOM_CREATE_FUNCTION:	// UDF function
    {
unknown's avatar
unknown committed
3015
      if (check_access(thd,INSERT_ACL,"mysql",0,1,0))
3016
	break;
unknown's avatar
unknown committed
3017
#ifdef HAVE_DLOPEN
3018 3019 3020 3021 3022 3023 3024 3025
      sp_head *sph= sp_find_function(thd, &lex->udf.name);
      if (sph)
      {
	net_printf(thd, ER_UDF_EXISTS, lex->udf.name.str);
	goto error;
      }
      if (!(res = mysql_create_function(thd,&lex->udf)))
	send_ok(thd);
unknown's avatar
unknown committed
3026
#else
unknown's avatar
unknown committed
3027 3028
      res= -1;
#endif
unknown's avatar
unknown committed
3029
    break;
3030
    }
unknown's avatar
unknown committed
3031
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3032 3033
  case SQLCOM_DROP_USER:
  {
unknown's avatar
unknown committed
3034
    if (check_access(thd, GRANT_ACL,"mysql",0,1,0))
3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048
      break;
    if (!(res= mysql_drop_user(thd, lex->users_list)))
    {
      if (mysql_bin_log.is_open())
      {
	Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
	mysql_bin_log.write(&qinfo);
      }
      send_ok(thd);
    }
    break;
  }
  case SQLCOM_REVOKE_ALL:
  {
unknown's avatar
unknown committed
3049
    if (check_access(thd, GRANT_ACL ,"mysql",0,1,0))
3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061
      break;
    if (!(res = mysql_revoke_all(thd, lex->users_list)))
    {
      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;
  }
3062 3063 3064 3065 3066 3067
  case SQLCOM_REVOKE:
  case SQLCOM_GRANT:
  {
    if (check_access(thd, lex->grant | lex->grant_tot_col | GRANT_ACL,
		     tables && tables->db ? tables->db : select_lex->db,
		     tables ? &tables->grant.privilege : 0,
unknown's avatar
unknown committed
3068
		     tables ? 0 : 1,0))
3069 3070
      goto error;

unknown's avatar
unknown committed
3071 3072 3073 3074
    /*
      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
    */
3075 3076 3077 3078 3079 3080 3081 3082 3083 3084

    if (thd->user)				// If not replication
    {
      LEX_USER *user;
      List_iterator <LEX_USER> user_list(lex->users_list);
      while ((user=user_list++))
      {
	if (user->password.str &&
	    (strcmp(thd->user,user->user.str) ||
	     user->host.str &&
unknown's avatar
unknown committed
3085
	     my_strcasecmp(&my_charset_latin1,
3086
                           user->host.str, thd->host_or_ip)))
3087
	{
unknown's avatar
unknown committed
3088
	  if (check_access(thd, UPDATE_ACL, "mysql",0,1,0))
3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100
	    goto error;
	  break;			// We are allowed to do changes
	}
      }
    }
    if (tables)
    {
      if (grant_option && check_grant(thd,
				      (lex->grant | lex->grant_tot_col |
				       GRANT_ACL),
				      tables))
	goto error;
unknown's avatar
unknown committed
3101 3102
      if (!(res = mysql_table_grant(thd,tables,lex->users_list, lex->columns,
				    lex->grant,
3103 3104
				    lex->sql_command == SQLCOM_REVOKE)) &&
          mysql_bin_log.is_open())
3105
      {
3106 3107
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
        mysql_bin_log.write(&qinfo);
3108 3109 3110 3111 3112 3113
      }
    }
    else
    {
      if (lex->columns.elements)
      {
3114
	send_error(thd,ER_ILLEGAL_GRANT_FOR_TABLE);
3115 3116 3117 3118 3119 3120 3121 3122 3123
	res=1;
      }
      else
	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
			  lex->sql_command == SQLCOM_REVOKE);
      if (!res)
      {
	if (mysql_bin_log.is_open())
	{
3124
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
3125 3126
	  mysql_bin_log.write(&qinfo);
	}
3127
	if (mqh_used && lex->sql_command == SQLCOM_GRANT)
3128
	{
unknown's avatar
unknown committed
3129 3130 3131
	  List_iterator <LEX_USER> str_list(lex->users_list);
	  LEX_USER *user;
	  while ((user=str_list++))
3132
	    reset_mqh(thd,user);
3133
	}
3134 3135 3136 3137
      }
    }
    break;
  }
unknown's avatar
SCRUM  
unknown committed
3138
#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/
unknown's avatar
unknown committed
3139
  case SQLCOM_RESET:
3140 3141 3142 3143 3144 3145 3146
    /* 
       RESET commands are never written to the binary log, so we have to
       initialize this variable because RESET shares the same code as FLUSH
    */
    lex->no_write_to_binlog= 1;
  case SQLCOM_FLUSH:
  {
unknown's avatar
unknown committed
3147
    if (check_global_access(thd,RELOAD_ACL) || check_db_used(thd, tables))
unknown's avatar
unknown committed
3148
      goto error;
3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171
    /*
      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)
      {
        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);
    }
unknown's avatar
unknown committed
3172
    break;
3173
  }
unknown's avatar
unknown committed
3174
  case SQLCOM_KILL:
unknown's avatar
SCRUM  
unknown committed
3175
    kill_one_thread(thd,lex->thread_id, lex->type & ONLY_KILL_QUERY);
unknown's avatar
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3176
    break;
unknown's avatar
unknown committed
3177
#ifndef NO_EMBEDDED_ACCESS_CHECKS
unknown's avatar
unknown committed
3178 3179
  case SQLCOM_SHOW_GRANTS:
    res=0;
3180 3181
    if ((thd->priv_user &&
	 !strcmp(thd->priv_user,lex->grant_user->user.str)) ||
unknown's avatar
unknown committed
3182
	!check_access(thd, SELECT_ACL, "mysql",0,1,0))
unknown's avatar
unknown committed
3183 3184 3185 3186
    {
      res = mysql_show_grants(thd,lex->grant_user);
    }
    break;
unknown's avatar
unknown committed
3187
#endif
3188
  case SQLCOM_HA_OPEN:
3189
    if (check_db_used(thd,tables) ||
unknown's avatar
unknown committed
3190
	check_table_access(thd,SELECT_ACL, tables,0))
3191 3192 3193 3194 3195 3196 3197 3198 3199
      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:
3200 3201 3202 3203 3204
    /*
      There is no need to check for table permissions here, because
      if a user has no permissions to read a table, he won't be
      able to open it (with SQLCOM_HA_OPEN) in the first place.
    */
unknown's avatar
unknown committed
3205
    if (check_db_used(thd,tables))
3206
      goto error;
unknown's avatar
unknown committed
3207
    res = mysql_ha_read(thd, tables, lex->ha_read_mode, lex->backup_dir,
3208 3209
			lex->insert_list, lex->ha_rkey_mode, select_lex->where,
			select_lex->select_limit, select_lex->offset_limit);
3210 3211
    break;

unknown's avatar
unknown committed
3212
  case SQLCOM_BEGIN:
unknown's avatar
unknown committed
3213 3214 3215 3216 3217 3218
    if (thd->locked_tables)
    {
      thd->lock=thd->locked_tables;
      thd->locked_tables=0;			// Will be automaticly closed
      close_thread_tables(thd);			// Free tables
    }
unknown's avatar
unknown committed
3219 3220 3221 3222 3223 3224
    if (end_active_trans(thd))
    {
      res= -1;
    }
    else
    {
3225
      thd->options= ((thd->options & (ulong) ~(OPTION_STATUS_NO_TRANS_UPDATE)) |
unknown's avatar
unknown committed
3226 3227
		     OPTION_BEGIN);
      thd->server_status|= SERVER_STATUS_IN_TRANS;
3228
      send_ok(thd);
unknown's avatar
unknown committed
3229
    }
unknown's avatar
unknown committed
3230 3231
    break;
  case SQLCOM_COMMIT:
3232 3233 3234 3235 3236
    /*
      We don't use end_active_trans() here to ensure that this works
      even if there is a problem with the OPTION_AUTO_COMMIT flag
      (Which of course should never happen...)
    */
unknown's avatar
unknown committed
3237
  {
3238
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
unknown's avatar
unknown committed
3239 3240
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    if (!ha_commit(thd))
unknown's avatar
unknown committed
3241
    {
3242
      send_ok(thd);
unknown's avatar
unknown committed
3243
    }
unknown's avatar
unknown committed
3244 3245 3246
    else
      res= -1;
    break;
unknown's avatar
unknown committed
3247
  }
unknown's avatar
unknown committed
3248 3249 3250
  case SQLCOM_ROLLBACK:
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    if (!ha_rollback(thd))
3251
    {
unknown's avatar
unknown committed
3252 3253 3254 3255 3256 3257 3258 3259 3260 3261
      /*
        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)
3262
	send_warning(thd,ER_WARNING_NOT_COMPLETE_ROLLBACK,0);
3263
      else
3264
	send_ok(thd);
3265
    }
unknown's avatar
unknown committed
3266 3267
    else
      res= -1;
3268
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
unknown's avatar
unknown committed
3269
    break;
unknown's avatar
unknown committed
3270 3271 3272
  case SQLCOM_ROLLBACK_TO_SAVEPOINT:
    if (!ha_rollback_to_savepoint(thd, lex->savepoint_name))
    {
unknown's avatar
unknown committed
3273
      if ((thd->options & OPTION_STATUS_NO_TRANS_UPDATE) && !thd->slave_thread)
unknown's avatar
unknown committed
3274
	send_warning(thd, ER_WARNING_NOT_COMPLETE_ROLLBACK, 0);
unknown's avatar
unknown committed
3275
      else
unknown's avatar
unknown committed
3276
	send_ok(thd);
unknown's avatar
unknown committed
3277 3278 3279 3280
    }
    else
      res= -1;
    break;
3281
  case SQLCOM_SAVEPOINT:
unknown's avatar
unknown committed
3282
    if (!ha_savepoint(thd, lex->savepoint_name))
unknown's avatar
unknown committed
3283
      send_ok(thd);
unknown's avatar
unknown committed
3284 3285
    else
      res= -1;
3286
    break;
3287 3288
  case SQLCOM_CREATE_PROCEDURE:
  case SQLCOM_CREATE_SPFUNCTION:
3289
    if (!lex->sphead)
3290
    {
3291 3292
      res= -1;			// Shouldn't happen
      break;
3293
    }
3294 3295
    else
    {
3296 3297
      uint namelen;
      char *name= lex->sphead->name(&namelen);
3298
#ifdef HAVE_DLOPEN
3299
      if (lex->sphead->m_type == TYPE_ENUM_FUNCTION)
3300
      {
3301 3302 3303 3304 3305 3306 3307
	udf_func *udf = find_udf(name, namelen);

	if (udf)
	{
	  net_printf(thd, ER_UDF_EXISTS, name);
	  goto error;
	}
3308
      }
3309
#endif
3310 3311 3312 3313 3314 3315 3316
      if (lex->sphead->m_type == TYPE_ENUM_FUNCTION &&
	  !lex->sphead->m_has_return)
      {
	net_printf(thd, ER_SP_NORETURN, name);
	goto error;
      }

3317
      res= lex->sphead->create(thd);
3318

3319
      switch (res)
3320
      {
3321 3322 3323 3324
      case SP_OK:
	send_ok(thd);
	break;
      case SP_WRITE_ROW_FAILED:
3325
	net_printf(thd, ER_SP_ALREADY_EXISTS, SP_TYPE_STRING(lex), name);
3326
	goto error;
3327
      default:
3328
	net_printf(thd, ER_SP_STORE_FAILED, SP_TYPE_STRING(lex), name);
3329
	goto error;
3330
      }
3331
      break;
3332 3333 3334 3335 3336
    }
  case SQLCOM_CALL:
    {
      sp_head *sp;

3337
      sp= sp_find_procedure(thd, &lex->udf.name);
3338 3339
      if (! sp)
      {
3340
	net_printf(thd, ER_SP_DOES_NOT_EXIST, "PROCEDURE", lex->udf.name);
3341
	goto error;
3342 3343 3344
      }
      else
      {
3345 3346 3347
	uint smrx;
	LINT_INIT(smrx);

unknown's avatar
unknown committed
3348
	// In case the arguments are subselects...
unknown's avatar
unknown committed
3349
	if (tables && ((res= check_table_access(thd, SELECT_ACL, tables, 0)) ||
unknown's avatar
unknown committed
3350 3351
		       (res= open_and_lock_tables(thd, tables))))
	{
3352
	  break;
unknown's avatar
unknown committed
3353
	}
3354 3355
	fix_tables_pointers(lex->all_selects_list);

3356
#ifndef EMBEDDED_LIBRARY
3357 3358 3359 3360
	// When executing substatements, they're assumed to send_error when
	// it happens, but not to send_ok.
	my_bool nsok= thd->net.no_send_ok;
	thd->net.no_send_ok= TRUE;
3361
#endif
3362
	if (sp->m_multi_results)
3363
	{
3364
	  if (! (thd->client_capabilities & CLIENT_MULTI_RESULTS))
3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375
	  {
	    send_error(thd, ER_SP_BADSELECT);
#ifndef EMBEDDED_LIBRARY
	    thd->net.no_send_ok= nsok;
#endif
	    goto error;
	  }
	  smrx= thd->server_status & SERVER_MORE_RESULTS_EXISTS;
	  thd->server_status |= SERVER_MORE_RESULTS_EXISTS;
	}

3376
	res= sp->execute_procedure(thd, &lex->value_list);
3377

3378
#ifndef EMBEDDED_LIBRARY
3379
	thd->net.no_send_ok= nsok;
3380
#endif
3381
	if (sp->m_multi_results)
3382 3383 3384 3385
	{
	  if (! smrx)
	    thd->server_status &= ~SERVER_MORE_RESULTS_EXISTS;
	}
3386

3387 3388
	if (res == 0)
	  send_ok(thd);
3389 3390
	else
	  goto error;		// Substatement should already have sent error
3391
      }
3392
      break;
3393 3394
    }
  case SQLCOM_ALTER_PROCEDURE:
3395
  case SQLCOM_ALTER_FUNCTION:
3396
    {
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      res= -1;
      uint newname_len= 0;
      if (lex->name)
	newname_len= strlen(lex->name);
      if (newname_len > NAME_LEN)
3402
      {
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3403
	net_printf(thd, ER_TOO_LONG_IDENT, lex->name);
3404
	goto error;
3405
      }
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3406 3407 3408 3409
      if (lex->sql_command == SQLCOM_ALTER_PROCEDURE)
	res= sp_update_procedure(thd, lex->udf.name.str, lex->udf.name.length,
				lex->name, newname_len, lex->comment->str,
				lex->comment->length, lex->suid);
3410
      else
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	res= sp_update_function(thd, lex->udf.name.str, lex->udf.name.length,
			       lex->name, newname_len, lex->comment->str,
			       lex->comment->length, lex->suid);
      switch (res)
3415
      {
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3416
      case SP_OK:
3417
	send_ok(thd);
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	break;
      case SP_KEY_NOT_FOUND:
	net_printf(thd, ER_SP_DOES_NOT_EXIST, SP_COM_STRING(lex),lex->udf.name);
	goto error;
      default:
	net_printf(thd, ER_SP_CANT_ALTER, SP_COM_STRING(lex),lex->udf.name);
	goto error;
3425
      }
3426
      break;
3427 3428
    }
  case SQLCOM_DROP_PROCEDURE:
3429
  case SQLCOM_DROP_FUNCTION:
3430
    {
3431 3432
      if (lex->sql_command == SQLCOM_DROP_PROCEDURE)
	res= sp_drop_procedure(thd, lex->udf.name.str, lex->udf.name.length);
3433 3434
      else
      {
3435 3436 3437
	res= sp_drop_function(thd, lex->udf.name.str, lex->udf.name.length);
#ifdef HAVE_DLOPEN
	if (res == SP_KEY_NOT_FOUND)
3438
	{
3439 3440 3441
	  udf_func *udf = find_udf(lex->udf.name.str, lex->udf.name.length);
	  if (udf)
	  {
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3442
	    if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 0))
3443 3444 3445 3446 3447 3448 3449
	      goto error;
	    if (!(res = mysql_drop_function(thd,&lex->udf.name)))
	    {
	      send_ok(thd);
	      break;
	    }
	  }
3450
	}
3451 3452 3453 3454 3455
#endif
      }
      switch (res)
      {
      case SP_OK:
3456
	send_ok(thd);
3457 3458
	break;
      case SP_KEY_NOT_FOUND:
3459 3460 3461 3462 3463 3464 3465 3466 3467
	if (lex->drop_if_exists)
	{
	  push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
			      ER_SP_DOES_NOT_EXIST, ER(ER_SP_DOES_NOT_EXIST),
			      SP_COM_STRING(lex), lex->udf.name.str);
	  res= 0;
	  send_ok(thd);
	  break;
	}
3468 3469
	net_printf(thd, ER_SP_DOES_NOT_EXIST, SP_COM_STRING(lex),
		   lex->udf.name.str);
3470 3471
	goto error;
      default:
3472 3473
	net_printf(thd, ER_SP_DROP_FAILED, SP_COM_STRING(lex),
		   lex->udf.name.str);
3474
	goto error;
3475
      }
3476
      break;
3477
    }
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  case SQLCOM_SHOW_CREATE_PROC:
    {
      res= -1;
      if (lex->udf.name.length > NAME_LEN)
      {
	net_printf(thd, ER_TOO_LONG_IDENT, lex->udf.name.str);
	goto error;
      }
      res= sp_show_create_procedure(thd, &lex->udf.name);
      if (res == SP_KEY_NOT_FOUND)
      {
	net_printf(thd, ER_SP_DOES_NOT_EXIST, 
		   SP_COM_STRING(lex), lex->udf.name.str);
	goto error;
      }
      break;
    }
  case SQLCOM_SHOW_CREATE_FUNC:
    {
      if (lex->udf.name.length > NAME_LEN)
      {
	net_printf(thd, ER_TOO_LONG_IDENT, lex->udf.name.str);
	goto error;
      }
      res= sp_show_create_function(thd, &lex->udf.name);
      if (res == SP_KEY_NOT_FOUND)
      {
	net_printf(thd, ER_SP_DOES_NOT_EXIST,
		   SP_COM_STRING(lex), lex->udf.name.str);
	goto error;
      }
      break;
    }
  case SQLCOM_SHOW_STATUS_PROC:
    {
      res= db_show_status_procedure(thd, (lex->wild ?
					  lex->wild->ptr() : NullS));
      break;
    }
  case SQLCOM_SHOW_STATUS_FUNC:
    {
      res= db_show_status_function(thd, (lex->wild ? 
					 lex->wild->ptr() : NullS));
      break;
    }
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3523
  default:					/* Impossible */
3524
    send_ok(thd);
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    break;
  }
  thd->proc_info="query end";			// QQ
3528 3529 3530

  // We end up here if res == 0 and send_ok() has been done,
  // or res != 0 and no send_error() has yet been done.
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3531
  if (res < 0)
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SCRUM  
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3532
    send_error(thd,thd->killed_errno());
3533
  DBUG_RETURN(res);
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3534 3535

error:
3536
  // We end up here if send_error() has already been done.
3537
  DBUG_RETURN(-1);
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3538 3539 3540
}


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3541
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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3542 3543 3544 3545
/*
  Check grants for commands which work only with one table and all other
  tables belong to subselects.

3546
  SYNOPSIS
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3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557
    single_table_command_access()
    thd - Thread handler
    privilege - asked privelage
    tables - table list of command
    res - pointer on result code variable

  RETURN
    0 - OK
    1 - access denied
*/

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3558
static bool single_table_command_access(THD *thd, ulong privilege,
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3559 3560 3561
					TABLE_LIST *tables, int *res)
					 
{
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3562
    if (check_access(thd, privilege, tables->db, &tables->grant.privilege,0,0))
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3563 3564 3565 3566 3567 3568 3569 3570 3571
      return 1;

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

    // check rights on tables of subselect (if exists)
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3572 3573 3574
    if (subselects_tables)
    {
      tables->next= subselects_tables;
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3575
      if ((*res= check_table_access(thd, SELECT_ACL, subselects_tables,0)))
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3576 3577
	return 1;
    }
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3578 3579 3580 3581
    return 0;
}


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3582
/****************************************************************************
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3583
  Get the user (global) and database privileges for all used tables
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3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596

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

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

    save_priv	In this we store global and db level grants for the table
		Note that we don't store db level grants if the global grants
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3597 3598
                is enough to satisfy the request and the global grants contains
                a SELECT grant.
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****************************************************************************/

bool
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3602
check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
3603
	     bool dont_check_global_grants, bool no_errors)
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3604
{
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3605 3606 3607 3608
  DBUG_ENTER("check_access");
  DBUG_PRINT("enter",("want_access: %lu  master_access: %lu", want_access,
		      thd->master_access));
  ulong db_access,dummy;
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3609 3610 3611 3612 3613
  if (save_priv)
    *save_priv=0;
  else
    save_priv= &dummy;

3614
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
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3615
  {
3616
    if (!no_errors)
3617
      send_error(thd,ER_NO_DB_ERROR);	/* purecov: tested */
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3618
    DBUG_RETURN(TRUE);				/* purecov: tested */
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  }

  if ((thd->master_access & want_access) == want_access)
  {
3623 3624 3625 3626 3627 3628 3629 3630 3631
    /*
      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))))
      db_access=acl_get(thd->host, thd->ip, (char*) &thd->remote.sin_addr,
3632
			thd->priv_user, db, test(want_access & GRANT_ACL));
3633
    *save_priv=thd->master_access | db_access;
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3634
    DBUG_RETURN(FALSE);
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3635
  }
3636
  if (((want_access & ~thd->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
3637
      ! db && dont_check_global_grants)
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3638
  {						// We can never grant this
3639
    if (!no_errors)
3640
      net_printf(thd,ER_ACCESS_DENIED_ERROR,
3641
		 thd->priv_user,
3642
		 thd->priv_host,
3643
		 thd->password ? ER(ER_YES) : ER(ER_NO));/* purecov: tested */
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3644
    DBUG_RETURN(TRUE);				/* purecov: tested */
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3645 3646 3647
  }

  if (db == any_db)
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3648
    DBUG_RETURN(FALSE);				// Allow select on anything
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3649

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3650 3651
  if (db && (!thd->db || strcmp(db,thd->db)))
    db_access=acl_get(thd->host, thd->ip, (char*) &thd->remote.sin_addr,
3652
		      thd->priv_user, db, test(want_access & GRANT_ACL));
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3653 3654
  else
    db_access=thd->db_access;
3655 3656
  // Remove SHOW attribute and access rights we already have
  want_access &= ~(thd->master_access | EXTRA_ACL);
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3657
  db_access= ((*save_priv=(db_access | thd->master_access)) & want_access);
3658 3659

  /* grant_option is set if there exists a single table or column grant */
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3660
  if (db_access == want_access ||
3661
      ((grant_option && !dont_check_global_grants) &&
3662
       !(want_access & ~(db_access | TABLE_ACLS))))
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3663
    DBUG_RETURN(FALSE);				/* Ok */
3664
  if (!no_errors)
3665
    net_printf(thd,ER_DBACCESS_DENIED_ERROR,
3666
	       thd->priv_user,
3667
	       thd->priv_host,
3668
	       db ? db : thd->db ? thd->db : "unknown"); /* purecov: tested */
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3669
  DBUG_RETURN(TRUE);				/* purecov: tested */
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3670 3671 3672
}


3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690
/*
  check for global access and give descriptive error message if it fails

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

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

  RETURN
    0	ok
    1	Access denied.  In this case an error is sent to the client
*/
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bool check_global_access(THD *thd, ulong want_access)
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3693
{
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3694
  char command[128];
3695
  if ((thd->master_access & want_access))
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3696 3697
    return 0;
  get_privilege_desc(command, sizeof(command), want_access);
3698
  net_printf(thd,ER_SPECIFIC_ACCESS_DENIED_ERROR,
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3699 3700
	     command);
  return 1;
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3701 3702 3703
}


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3704
/*
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3705 3706
  Check the privilege for all used tables.  Table privileges are cached
  in the table list for GRANT checking
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*/

3709
bool
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3710
check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
3711
		   bool no_errors)
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3712
{
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  uint found=0;
  ulong found_access=0;
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  TABLE_LIST *org_tables=tables;
  for (; tables ; tables=tables->next)
  {
3718
    if (tables->derived || (tables->table && (int)tables->table->tmp_table))
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3719
      continue;
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3720 3721
    if ((thd->master_access & want_access) == (want_access & ~EXTRA_ACL) &&
	thd->db)
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3722
      tables->grant.privilege= want_access;
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3723
    else if (tables->db && tables->db == thd->db)
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3724 3725 3726 3727 3728
    {
      if (found && !grant_option)		// db already checked
	tables->grant.privilege=found_access;
      else
      {
3729 3730
	if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
			 0, no_errors))
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3731 3732
	  return TRUE;				// Access denied
	found_access=tables->grant.privilege;
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3733
	found=1;
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3734 3735
      }
    }
3736
    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
3737
			  0, no_errors))
3738
      return TRUE;
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3739 3740
  }
  if (grant_option)
3741
    return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
3742
		       test(want_access & EXTRA_ACL), no_errors);
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  return FALSE;
}

3746 3747
static bool check_merge_table_access(THD *thd, char *db,
				     TABLE_LIST *table_list)
3748 3749 3750 3751
{
  int error=0;
  if (table_list)
  {
3752
    /* Check that all tables use the current database */
3753 3754
    TABLE_LIST *tmp;
    for (tmp=table_list; tmp ; tmp=tmp->next)
3755 3756 3757 3758
    {
      if (!tmp->db || !tmp->db[0])
	tmp->db=db;
    }
3759
    error=check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
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3760
			     table_list,0);
3761 3762 3763 3764
  }
  return error;
}

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3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781
#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;
}
3782

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3783 3784 3785 3786 3787 3788 3789 3790 3791 3792
/****************************************************************************
	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

3793
#ifndef EMBEDDED_LIBRARY
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3794 3795 3796 3797 3798 3799 3800 3801
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));
3802
    thd->fatal_error();
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3803 3804 3805 3806
    return 1;
  }
  return 0;
}
3807
#endif /* EMBEDDED_LIBRARY */
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3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841

#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;
}


/****************************************************************************
3842
  Initialize global thd variables needed for query
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3843 3844
****************************************************************************/

3845
void
3846
mysql_init_query(THD *thd, bool lexonly)
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3847 3848
{
  DBUG_ENTER("mysql_init_query");
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3849
  LEX *lex=thd->lex;
3850 3851
  lex->unit.init_query();
  lex->unit.init_select();
3852
  lex->unit.thd= thd;
3853 3854 3855
  lex->select_lex.init_query();
  lex->value_list.empty();
  lex->param_list.empty();
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  lex->unit.next= lex->unit.master= 
    lex->unit.link_next= lex->unit.return_to=0;
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  lex->unit.prev= lex->unit.link_prev= 0;
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  lex->unit.slave= lex->unit.global_parameters= lex->current_select=
3860
    lex->all_selects_list= &lex->select_lex;
3861 3862
  lex->select_lex.master= &lex->unit;
  lex->select_lex.prev= &lex->unit.slave;
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  lex->select_lex.link_next= lex->select_lex.slave= lex->select_lex.next= 0;
3864
  lex->select_lex.link_prev= (st_select_lex_node**)&(lex->all_selects_list);
3865 3866
  lex->select_lex.init_order();
  lex->select_lex.group_list.empty();
3867 3868
  lex->describe= 0;
  lex->derived_tables= FALSE;
3869 3870
  lex->lock_option= TL_READ;
  lex->found_colon= 0;
3871
  lex->safe_to_cache_query= 1;
3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885
  if (! lexonly)
  {
    thd->select_number= lex->select_lex.select_number= 1;
    thd->free_list= 0;
    thd->total_warn_count=0;			// Warnings for this query
    thd->last_insert_id_used= thd->query_start_used= thd->insert_id_used=0;
    thd->sent_row_count= thd->examined_row_count= 0;
    thd->is_fatal_error= thd->rand_used= 0;
    thd->server_status &= ~SERVER_MORE_RESULTS_EXISTS;
    thd->tmp_table_used= 0;
    if (opt_bin_log)
      reset_dynamic(&thd->user_var_events);
    thd->clear_error();
  }
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  DBUG_VOID_RETURN;
}

3889

3890 3891 3892
void
mysql_init_select(LEX *lex)
{
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3893
  SELECT_LEX *select_lex= lex->current_select;
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3894
  select_lex->init_select();
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  select_lex->select_limit= lex->thd->variables.select_limit;
3896 3897 3898 3899 3900 3901
  if (select_lex == &lex->select_lex)
  {
    lex->exchange= 0;
    lex->result= 0;
    lex->proc_list.first= 0;
  }
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}

3904

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bool
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mysql_new_select(LEX *lex, bool move_down)
3907
{
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  SELECT_LEX *select_lex = new(&lex->thd->mem_root) SELECT_LEX();
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  if (!select_lex)
    return 1;
3911
  select_lex->select_number= ++lex->thd->select_number;
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  select_lex->init_query();
  select_lex->init_select();
  if (move_down)
  {
    /* first select_lex of subselect or derived table */
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    SELECT_LEX_UNIT *unit= new(&lex->thd->mem_root) SELECT_LEX_UNIT();
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    if (!unit)
      return 1;
    unit->init_query();
    unit->init_select();
3922
    unit->thd= lex->thd;
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    unit->include_down(lex->current_select);
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    unit->link_next= 0;
    unit->link_prev= 0;
3926
    unit->return_to= lex->current_select;
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    select_lex->include_down(unit);
3928
    // TODO: assign resolve_mode for fake subquery after merging with new tree
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  }
  else
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  {
3932
    select_lex->include_neighbour(lex->current_select);
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    SELECT_LEX_UNIT *unit= select_lex->master_unit();
    SELECT_LEX *fake= unit->fake_select_lex;
    if (!fake)
    {
      /*
	as far as we included SELECT_LEX for UNION unit should have
	fake SELECT_LEX for UNION processing
      */
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      fake= unit->fake_select_lex= new(&lex->thd->mem_root) SELECT_LEX();
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      fake->include_standalone(unit,
			       (SELECT_LEX_NODE**)&unit->fake_select_lex);
      fake->select_number= INT_MAX;
      fake->make_empty_select();
      fake->linkage= GLOBAL_OPTIONS_TYPE;
      fake->select_limit= lex->thd->variables.select_limit;
    }
  }
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3951
  select_lex->master_unit()->global_parameters= select_lex;
3952
  select_lex->include_global((st_select_lex_node**)&lex->all_selects_list);
3953
  lex->current_select= select_lex;
3954
  select_lex->resolve_mode= SELECT_LEX::SELECT_MODE;
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  return 0;
3956
}
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/*
  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)
{
3973
  THD *thd;
3974
  LEX *lex;
3975
  LEX_STRING tmp, null_lex_string;
3976
  DBUG_ENTER("create_select_for_variable");
3977 3978

  thd= current_thd;
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  lex= thd->lex;
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  mysql_init_select(lex);
  lex->sql_command= SQLCOM_SELECT;
  tmp.str= (char*) var_name;
  tmp.length=strlen(var_name);
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  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));
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  DBUG_VOID_RETURN;
}

3990

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void mysql_init_multi_delete(LEX *lex)
{
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  lex->sql_command=  SQLCOM_DELETE_MULTI;
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  mysql_init_select(lex);
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  lex->select_lex.select_limit= lex->unit.select_limit_cnt=
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    HA_POS_ERROR;
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  lex->select_lex.table_list.save_and_clear(&lex->auxilliary_table_list);
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}
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4000

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

  mysql_init_query(thd);
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  if (query_cache_send_result_to_client(thd, inBuf, length) <= 0)
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  {
    LEX *lex=lex_start(thd, (uchar*) inBuf, length);
4010
    if (!yyparse((void *)thd) && ! thd->is_fatal_error)
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    {
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
4013
      if (mqh_used && thd->user_connect &&
4014
	  check_mqh(thd, lex->sql_command))
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      {
	thd->net.error = 0;
      }
      else
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#endif
4020
      {
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	if (thd->net.report_error)
4022
	{
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	  send_error(thd, 0, NullS);
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	  if (thd->lex->sphead)
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	  {
	    if (lex != thd->lex)
	      thd->lex->sphead->restore_lex(thd);
	    delete thd->lex->sphead;
	    thd->lex->sphead= NULL;
	  }
4031
	}
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	else
	{
	  mysql_execute_command(thd);
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#ifndef EMBEDDED_LIBRARY  /* TODO query cache in embedded library*/
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	  query_cache_end_of_result(&thd->net);
4037
#endif
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	}
4039
      }
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    }
    else
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    {
      DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
4044
			 thd->is_fatal_error));
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#ifndef EMBEDDED_LIBRARY   /* TODO query cache in embedded library*/
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      query_cache_abort(&thd->net);
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      if (thd->lex->sphead)
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      {
	if (lex != thd->lex)
	  thd->lex->sphead->restore_lex(thd);
	delete thd->lex->sphead;
	thd->lex->sphead= NULL;
      }
4054
#endif
4055
    }
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    thd->proc_info="freeing items";
4057
    free_items(thd->free_list);  /* Free strings used by items */
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    lex_end(lex);
  }
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  DBUG_VOID_RETURN;
}


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

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

  if (strlen(field_name) > NAME_LEN)
  {
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    net_printf(thd, ER_TOO_LONG_IDENT, field_name); /* purecov: inspected */
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    DBUG_RETURN(1);				/* purecov: inspected */
  }
  if (type_modifier & PRI_KEY_FLAG)
  {
    lex->col_list.push_back(new key_part_spec(field_name,0));
4090
    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));
4097
    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();
  }

4102
  if (default_value)
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  {
4104
    if (default_value->type() == Item::NULL_ITEM)
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    {
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      default_value=0;
      if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) ==
	  NOT_NULL_FLAG)
      {
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	net_printf(thd,ER_INVALID_DEFAULT,field_name);
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	DBUG_RETURN(1);
      }
    }
    else if (type_modifier & AUTO_INCREMENT_FLAG)
    {
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      net_printf(thd, ER_INVALID_DEFAULT, field_name);
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      DBUG_RETURN(1);
    }
  }
  if (!(new_field=new create_field()))
    DBUG_RETURN(1);
  new_field->field=0;
  new_field->field_name=field_name;
4124
  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;
4135
  new_field->charset=cs;
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  new_field->geom_type= (Field::geometry_type) uint_geom_type;
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  if (!comment)
  {
    new_field->comment.str=0;
    new_field->comment.length=0;
  }
  else
  {
    /* In this case comment is always of type Item_string */
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    new_field->comment.str=   (char*) comment->str;
    new_field->comment.length=comment->length;
4148
  }
4149 4150
  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 &&
4154
      new_field->length < new_field->decimals+1 &&
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      new_field->decimals != NOT_FIXED_DEC)
4156
    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)
4183 4184 4185 4186 4187 4188 4189
      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;
4191 4192
  case FIELD_TYPE_STRING:
  case FIELD_TYPE_VAR_STRING:
4193
    if (new_field->length <= MAX_FIELD_CHARLENGTH || default_value)
4194 4195 4196 4197
      break;
    /* Convert long CHAR() and VARCHAR columns to TEXT or BLOB */
    new_field->sql_type= FIELD_TYPE_BLOB;
    sprintf(warn_buff, ER(ER_AUTO_CONVERT), field_name, "CHAR",
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	    (cs == &my_charset_bin) ? "BLOB" : "TEXT");
4199 4200 4201
    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_AUTO_CONVERT,
		 warn_buff);
    /* fall through */
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  case FIELD_TYPE_BLOB:
  case FIELD_TYPE_TINY_BLOB:
  case FIELD_TYPE_LONG_BLOB:
  case FIELD_TYPE_MEDIUM_BLOB:
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  case FIELD_TYPE_GEOMETRY:
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    if (new_field->length)
    {
      /* The user has given a length to the blob column */
      if (new_field->length < 256)
	type= FIELD_TYPE_TINY_BLOB;
      if (new_field->length < 65536)
	type= FIELD_TYPE_BLOB;
      else if (new_field->length < 256L*256L*256L)
	type= FIELD_TYPE_MEDIUM_BLOB;
      else
	type= FIELD_TYPE_LONG_BLOB;
      new_field->length= 0;
    }
    new_field->sql_type= type;
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    if (default_value)				// Allow empty as default value
    {
      String str,*res;
      res=default_value->val_str(&str);
      if (res->length())
      {
4227
	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)
      {
4247
	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)
      {
4301
	net_printf(thd,ER_TOO_BIG_SET,field_name); /* purecov: inspected */
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	DBUG_RETURN(1);				/* purecov: inspected */
      }
      new_field->pack_length=(interval->count+7)/8;
      if (new_field->pack_length > 4)
	new_field->pack_length=8;
      new_field->interval=interval;
      new_field->length=0;
      for (const char **pos=interval->type_names; *pos ; pos++)
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      {
	new_field->length+=(uint) strip_sp((char*) *pos)+1;
      }
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      new_field->length--;
      set_if_smaller(new_field->length,MAX_FIELD_WIDTH-1);
      if (default_value)
      {
4317 4318
	char *not_used;
	uint not_used2;
4319
  bool not_used3;
4320

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	thd->cuted_fields=0;
	String str,*res;
	res=default_value->val_str(&str);
4324
	(void) find_set(interval, res->ptr(), res->length(), &not_used,
4325
			&not_used2, &not_used3);
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	if (thd->cuted_fields)
	{
4328
	  net_printf(thd,ER_INVALID_DEFAULT,field_name);
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	  DBUG_RETURN(1);
	}
      }
    }
    break;
  case FIELD_TYPE_ENUM:
    {
      new_field->interval=interval;
      new_field->pack_length=interval->count < 256 ? 1 : 2; // Should be safe
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      new_field->length=(uint) strip_sp((char*) interval->type_names[0]);
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      for (const char **pos=interval->type_names+1; *pos ; pos++)
      {
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	uint length=(uint) strip_sp((char*) *pos);
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	set_if_bigger(new_field->length,length);
      }
      set_if_smaller(new_field->length,MAX_FIELD_WIDTH-1);
      if (default_value)
      {
	String str,*res;
	res=default_value->val_str(&str);
	if (!find_enum(interval,res->ptr(),res->length()))
	{
4351
	  net_printf(thd,ER_INVALID_DEFAULT,field_name);
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	  DBUG_RETURN(1);
	}
      }
      break;
    }
  }

4359 4360
  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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  {
4365
    net_printf(thd,ER_TOO_BIG_FIELDLENGTH,field_name,
4366
	       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)
  {
4372
    net_printf(thd,ER_WRONG_FIELD_SPEC,field_name);
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    DBUG_RETURN(1);
  }
  if (!new_field->pack_length)
    new_field->pack_length=calc_pack_length(new_field->sql_type ==
					    FIELD_TYPE_VAR_STRING ?
					    FIELD_TYPE_STRING :
					    new_field->sql_type,
					    new_field->length);
  lex->create_list.push_back(new_field);
  lex->last_field=new_field;
  DBUG_RETURN(0);
}

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

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

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

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


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

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

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


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


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/*
  Add a table to list of used tables

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

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

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TABLE_LIST *st_select_lex::add_table_to_list(THD *thd,
					     Table_ident *table,
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					     LEX_STRING *alias,
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					     ulong table_options,
					     thr_lock_type lock_type,
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					     List<String> *use_index,
					     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;
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  if (check_table_name(table->table.str,table->table.length) ||
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      table->db.str && check_db_name(table->db.str))
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  {
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    net_printf(thd,ER_WRONG_TABLE_NAME,table->table.str);
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    DBUG_RETURN(0);
  }

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

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/*
  Set lock for all tables in current select level

  SYNOPSIS:
    set_lock_for_tables()
    lock_type			Lock to set for tables

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

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

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

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


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

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

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

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

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/*
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  Reload/resets privileges and the different caches.

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

  RETURN
    0	 ok
    !=0  error
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*/

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bool reload_acl_and_cache(THD *thd, ulong options, TABLE_LIST *tables,
                          bool *write_to_binlog)
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{
  bool result=0;
  select_errors=0;				/* Write if more errors */
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  bool tmp_write_to_binlog= 1;
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  if (options & REFRESH_GRANT)
  {
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    acl_reload(thd);
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    grant_reload(thd);
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    if (mqh_used)
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      reset_mqh(thd,(LEX_USER *) NULL,true);
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  }
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#endif
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  if (options & REFRESH_LOG)
  {
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    /*
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      Flush the normal query log, the update log, the binary log,
      the slow query log, and the relay log (if it exists).
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    */
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    /* 
     Writing this command to the binlog may result in infinite loops when doing
     mysqlbinlog|mysql, and anyway it does not really make sense to log it
     automatically (would cause more trouble to users than it would help them)
    */
    tmp_write_to_binlog= 0;
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    mysql_log.new_file(1);
    mysql_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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  }
4749
#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)
 {
4760
   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, bool only_kill_query)
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{
  THD *tmp;
  uint error=ER_NO_SUCH_THREAD;
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  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For unlink from list
  I_List_iterator<THD> it(threads);
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  while ((tmp=it++))
  {
    if (tmp->thread_id == id)
    {
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      pthread_mutex_lock(&tmp->LOCK_delete);	// Lock from delete
      break;
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    }
  }
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
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  if (tmp)
  {
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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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    {
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      tmp->awake(only_kill_query ? THD::KILL_QUERY : THD::KILL_CONNECTION);
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      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)
4845
{
4846
  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);
4859
  end=convert_dirname(buff, *filename_ptr, NullS);
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  if (!(ptr=thd->alloc((uint) (end-buff)+(uint) strlen(table_name)+1)))
4861 4862
    return 1;					// End of memory
  *filename_ptr=ptr;
4863
  strxmov(ptr,buff,table_name,NullS);
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  return 0;
}
4866

4867

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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];
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    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;
}

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

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

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

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

compare_func_creator comp_ne_creator(bool invert)
{
  return invert?&Item_bool_func2::eq_creator:&Item_bool_func2::ne_creator;
}