sql_parse.cc 109 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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#include <assert.h>
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#ifdef HAVE_INNOBASE_DB
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#include "ha_innodb.h"
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#endif

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#ifdef HAVE_OPENSSL
/*
  Without SSL the handshake consists of one packet. This packet
  has both client capabilites and scrambled password.
  With SSL the handshake might consist of two packets. If the first
  packet (client capabilities) has CLIENT_SSL flag set, we have to
  switch to SSL and read the second packet. The scrambled password
  is in the second packet and client_capabilites field will be ignored.
  Maybe it is better to accept flags other than CLIENT_SSL from the
  second packet?
*/
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#define SSL_HANDSHAKE_SIZE      2
#define NORMAL_HANDSHAKE_SIZE   6
#define MIN_HANDSHAKE_SIZE      2
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#else
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#define MIN_HANDSHAKE_SIZE      6
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#endif /* HAVE_OPENSSL */
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#define SCRAMBLE_LENGTH 8

extern int yyparse(void);
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(USER_CONN *uc);
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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static bool check_merge_table_access(THD *thd, char *db, TABLE_LIST *tables);
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static bool check_dup(const char *db, const char *name, TABLE_LIST *tables);
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static void mysql_init_query(THD *thd);
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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static bool create_total_list(THD *thd, LEX *lex,
			      TABLE_LIST **result, bool skip_first);
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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",
  "Error"					// Last command number
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};

bool volatile abort_slave = 0;

#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;
extern  pthread_mutex_t LOCK_user_conn;

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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(&current_thd->net, 0, NullS);	// Out of memory
      return_val=1;
      goto end;
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    }
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    uc->user=(char*) (uc+1);
    memcpy(uc->user,temp_user,temp_len+1);
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    uc->user_len= user_len;
    uc->host=uc->user + uc->user_len +  1;
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    uc->len = temp_len;
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    uc->connections = 0;
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    uc->questions=uc->updates=uc->conn_per_hour=0;
    uc->user_resources=*mqh;
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    if (max_user_connections && mqh->connections > max_user_connections) 
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      uc->user_resources.connections = max_user_connections;
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    uc->intime=thd->thr_create_time;
    if (hash_insert(&hash_user_connections, (byte*) uc))
    {
      my_free((char*) uc,0);
      send_error(&current_thd->net, 0, NullS);	// Out of memory
      return_val=1;
      goto end;
    }
  }
  thd->user_connect=uc;
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  uc->connections++;
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end:
  (void) pthread_mutex_unlock(&LOCK_user_conn);
  return return_val;
 
}
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/*
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  Check if user is ok
  Updates:
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  thd->{user,master_access,priv_user,priv_host,db,db_access}
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*/

static bool check_user(THD *thd,enum_server_command command, const char *user,
		       const char *passwd, const char *db, bool check_count)
{
  NET *net= &thd->net;
  thd->db=0;
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  thd->db_length=0;
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  USER_RESOURCES ur;
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  char tmp_passwd[SCRAMBLE_LENGTH + 1];
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  if (passwd[0] && strlen(passwd) != SCRAMBLE_LENGTH)
    return 1;
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  /*
    Move password to temporary buffer as it may be stored in communication
    buffer
  */
  strmov(tmp_passwd, passwd);
  passwd= tmp_passwd;				// Use local copy

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  if (!(thd->user = my_strdup(user, MYF(0))))
  {
    send_error(net,ER_OUT_OF_RESOURCES);
    return 1;
  }
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  thd->master_access=acl_getroot(thd, thd->host, thd->ip, thd->user,
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				 passwd, thd->scramble,
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                                 &thd->priv_user, thd->priv_host,
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				 protocol_version == 9 ||
				 !(thd->client_capabilities &
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				   CLIENT_LONG_PASSWORD),&ur);
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  DBUG_PRINT("info",
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	     ("Capabilities: %d  packet_length: %ld  Host: '%s'  Login user: '%s'  Priv_user: '%s'  Using password: %s  Access: %u  db: '%s'",
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	      thd->client_capabilities, thd->max_client_packet_length,
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	      thd->host_or_ip, thd->user, thd->priv_user,
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	      passwd[0] ? "yes": "no",
	      thd->master_access, thd->db ? thd->db : "*none*"));
  if (thd->master_access & NO_ACCESS)
  {
    net_printf(net, ER_ACCESS_DENIED_ERROR,
	       thd->user,
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	       thd->host_or_ip,
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	       passwd[0] ? ER(ER_YES) : ER(ER_NO));
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    mysql_log.write(thd,COM_CONNECT,ER(ER_ACCESS_DENIED_ERROR),
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		    thd->user,
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		    thd->host_or_ip,
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		    passwd[0] ? ER(ER_YES) : ER(ER_NO));
    return(1);					// Error already given
  }
  if (check_count)
  {
    VOID(pthread_mutex_lock(&LOCK_thread_count));
    bool tmp=(thread_count - delayed_insert_threads >= max_connections &&
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	      !(thd->master_access & SUPER_ACL));
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    VOID(pthread_mutex_unlock(&LOCK_thread_count));
    if (tmp)
    {						// Too many connections
      send_error(net, ER_CON_COUNT_ERROR);
      return(1);
    }
  }
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  mysql_log.write(thd,command,
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		  (thd->priv_user == thd->user ?
		   (char*) "%s@%s on %s" :
		   (char*) "%s@%s as anonymous on %s"),
		  user,
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		  thd->host_or_ip,
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		  db ? db : (char*) "");
  thd->db_access=0;
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  /* 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,user,thd->host_or_ip,&ur))
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    return -1;
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  if (thd->user_connect && (thd->user_connect->user_resources.connections ||
			    max_user_connections) &&
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      check_for_max_user_connections(thd->user_connect))
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    return -1;
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  if (db && db[0])
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  {
    bool error=test(mysql_change_db(thd,db));
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    if (error && thd->user_connect)
      decrease_user_connections(thd->user_connect);
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    return error;
  }
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  else
    send_ok(net);				// Ready to handle questions
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  thd->password= test(passwd[0]);		// Remember for error messages
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  return 0;					// ok
}

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


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

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

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

char  uc_update_queries[SQLCOM_END];

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


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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)
  {
    net_printf(&thd->net, ER_USER_LIMIT_REACHED, uc->user, "max_questions",
	       (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)
    {
      net_printf(&thd->net, ER_USER_LIMIT_REACHED, uc->user, "max_updates",
		 (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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    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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/*
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  Check connnetion and get priviliges
  Returns 0 on ok, -1 < if error is given > 0 on error.
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*/

static int
check_connections(THD *thd)
{
  uint connect_errors=0;
  NET *net= &thd->net;
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  /* Store the connection details */
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  DBUG_PRINT("info", (("check_connections called by thread %d"),
	     thd->thread_id));
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  DBUG_PRINT("info",("New connection received on %s",
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			vio_description(net->vio)));
  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);
    if (!(thd->ip = my_strdup(ip,MYF(0))))
      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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    {
      thd->host= (char*) localhost;
      thd->host_or_ip= localhost;
    }
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    else
#endif
    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);
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      /* Cut very long hostnames to avoid possible overflows */
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      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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    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));
  }
  vio_keepalive(net->vio, TRUE);

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  ulong pkt_len=0;
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  {
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    /* buff[] needs to big enough to hold the server_version variable */
    char buff[SERVER_VERSION_LENGTH + SCRAMBLE_LENGTH+32],*end;
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    int client_flags = CLIENT_LONG_FLAG | CLIENT_CONNECT_WITH_DB;
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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;
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    int4store((uchar*) end,thd->thread_id);
    end+=4;
    memcpy(end,thd->scramble,SCRAMBLE_LENGTH+1);
    end+=SCRAMBLE_LENGTH +1;
    int2store(end,client_flags);
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    end[2]=(char) MY_CHARSET_CURRENT;
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    int2store(end+3,thd->server_status);
    bzero(end+5,13);
    end+=18;
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    if (net_write_command(net,(uchar) protocol_version, 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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  if (thd->client_capabilities & CLIENT_IGNORE_SPACE)
    thd->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);
      return(ER_HANDSHAKE_ERROR);    
    }
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    DBUG_PRINT("info", ("Reading user information over SSL layer"));
    if ((pkt_len=my_net_read(net)) == packet_error ||
	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);
    }
  }
  else
  {
    DBUG_PRINT("info", ("Leaving IO layer intact"));
    if (pkt_len < NORMAL_HANDSHAKE_SIZE)
    {
      inc_host_errors(&thd->remote.sin_addr);
      return ER_HANDSHAKE_ERROR;
    }
  }
#endif

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  thd->max_client_packet_length=uint3korr(net->read_pos+2);
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  char *user=   (char*) net->read_pos+5;
  char *passwd= strend(user)+1;
  char *db=0;
  if (thd->client_capabilities & CLIENT_CONNECT_WITH_DB)
    db=strend(passwd)+1;
  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) &&
      opt_using_transactions)
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    thd->net.return_status= &thd->server_status;
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  net->read_timeout=(uint) thd->variables.net_read_timeout;
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  if (check_user(thd,COM_CONNECT, user, passwd, db, 1))
    return (-1);
  return 0;
}


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
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  if (!(test_flags & TEST_NO_THREADS) & my_thread_init())
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  {
    close_connection(&thd->net,ER_OUT_OF_RESOURCES);
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    statistic_increment(aborted_connects,&LOCK_status);
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    end_thread(thd,0);
    return 0;
  }
#endif

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

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

    if ((error=check_connections(thd)))
    {						// Wrong permissions
      if (error > 0)
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	net_printf(net,error,thd->host_or_ip);
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#ifdef __NT__
      if (vio_type(net->vio) == VIO_TYPE_NAMEDPIPE)
	sleep(1);				/* must wait after eof() */
#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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    init_sql_alloc(&thd->mem_root, thd->variables.query_alloc_block_size,
		   thd->variables.query_prealloc_size);
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    init_sql_alloc(&thd->transaction.mem_root,
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		   thd->variables.trans_alloc_block_size,
		   thd->variables.trans_prealloc_size);

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    while (!net->error && net->vio != 0 && !thd->killed)
    {
      if (do_command(thd))
	break;
    }
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    if (thd->user_connect)
      decrease_user_connections(thd->user_connect);
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    free_root(&thd->mem_root,MYF(0));
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    if (net->error && net->vio != 0)
    {
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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(net,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:
    close_connection(net);
    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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/*
  Execute commands from bootstrap_file.
  Used when creating the initial grant tables
*/
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extern "C" pthread_handler_decl(handle_bootstrap,arg)
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{
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  THD *thd=(THD*) arg;
  FILE *file=bootstrap_file;
  char *buff;
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  /* The following must be called before DBUG_ENTER */
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  if (my_thread_init() || thd->store_globals())
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  {
    close_connection(&thd->net,ER_OUT_OF_RESOURCES);
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    thd->fatal_error=1;
    goto end;
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  }
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  DBUG_ENTER("handle_bootstrap");

  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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  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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  init_sql_alloc(&thd->mem_root, thd->variables.query_alloc_block_size,
		 thd->variables.query_prealloc_size);
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  init_sql_alloc(&thd->transaction.mem_root,
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		 thd->variables.trans_alloc_block_size,
		 thd->variables.trans_prealloc_size);
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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 && (isspace(buff[length-1]) || buff[length-1] == ';'))
      length--;
    buff[length]=0;
    thd->current_tablenr=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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    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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    mysql_parse(thd,thd->query,length);
    close_thread_tables(thd);			// Free tables
    if (thd->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:
  (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);
  DBUG_RETURN(0);				// Never reached
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}


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inline void free_items(THD *thd)
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{
    /* This works because items are allocated with sql_alloc() */
  for (Item *item=thd->free_list ; item ; item=item->next)
    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))
  {
    net_printf(&thd->net,ER_WRONG_DB_NAME, db ? db : "NULL");
    goto err;
  }
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  if (lower_case_table_names)
    casedn_str(tbl_name);
  remove_escape(tbl_name);

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

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  if (check_access(thd, SELECT_ACL, db, &table_list->grant.privilege))
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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;

  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)))
  {
    my_error(ER_GET_ERRNO, MYF(0));
    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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}


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

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;
  thd->current_tablenr=0;

  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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  net->last_error[0]=0;				// Clear error message
  net->last_errno=0;

  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(net,net->last_errno,NullS);
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    net->error= 0;
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    DBUG_RETURN(FALSE);
  }
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  else
  {
    packet=(char*) net->read_pos;
    command = (enum enum_server_command) (uchar) packet[0];
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    if (command >= COM_END)
      command= COM_END;				// Wrong command
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    DBUG_PRINT("info",("Command on %s = %d (%s)",
		       vio_description(net->vio), command,
		       command_name[command]));
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  }
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  net->read_timeout=old_timeout;		// restore it
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  DBUG_RETURN(dispatch_command(command,thd, packet+1, (uint) packet_length));
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}


bool dispatch_command(enum enum_server_command command, THD *thd,
		      char* packet, uint packet_length)
{
  NET *net= &thd->net;
  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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    statistic_increment(com_stat[SQLCOM_CHANGE_DB],&LOCK_status);
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    if (!mysql_change_db(thd,packet))
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      mysql_log.write(thd,command,"%s",thd->db);
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    break;
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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->net);
    break;
  }
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  case COM_TABLE_DUMP:
    {
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      statistic_increment(com_other, &LOCK_status);
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      slow_command = TRUE;
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      uint db_len = *(uchar*)packet;
      uint tbl_len = *(uchar*)(packet + db_len + 1);
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      char* db = thd->alloc(db_len + tbl_len + 2);
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      memcpy(db, packet + 1, db_len);
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      char* tbl_name = db + db_len;
      *tbl_name++ = 0;
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      memcpy(tbl_name, packet + db_len + 2, tbl_len);
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      tbl_name[tbl_len] = 0;
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      if (mysql_table_dump(thd, db, tbl_name, -1))
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	send_error(&thd->net); // dump to NET
      break;
    }
  case COM_CHANGE_USER:
  {
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    thd->change_user();
    clear_error_message(thd);			// If errors from rollback

    statistic_increment(com_other,&LOCK_status);
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    char *user=   (char*) packet;
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    char *passwd= strend(user)+1;
    char *db=     strend(passwd)+1;

    /* Save user and privileges */
    uint save_master_access=thd->master_access;
    uint save_db_access=    thd->db_access;
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    uint save_db_length=    thd->db_length;
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    char *save_user=	    thd->user;
    char *save_priv_user=   thd->priv_user;
    char *save_db=	    thd->db;
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    USER_CONN *save_user_connect= thd->user_connect;
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    if ((uint) ((uchar*) db - net->read_pos) > packet_length)
    {						// Check if protocol is ok
      send_error(net, ER_UNKNOWN_COM_ERROR);
      break;
    }
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    /* Clear variables that are allocated */
    thd->user= 0;
    thd->user_connect= 0;
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    if (check_user(thd, COM_CHANGE_USER, user, passwd, db, 0))
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    {						// Restore old user
      x_free(thd->user);
      thd->master_access=save_master_access;
      thd->db_access=save_db_access;
      thd->db=save_db;
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      thd->db_length=save_db_length;
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      thd->user=save_user;
      thd->priv_user=save_priv_user;
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      thd->user_connect= save_user_connect;
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      break;
    }
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    if (save_user_connect)
      decrease_user_connections(save_user_connect);
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    x_free((gptr) save_db);
    x_free((gptr) save_user);
    break;
  }

  case COM_QUERY:
  {
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    packet_length--;				// Remove end null
    /* Remove garage at start and end of query */
    while (isspace(packet[0]) && packet_length > 0)
    {
      packet++;
      packet_length--;
    }
    char *pos=packet+packet_length;		// Point at end null
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    while (packet_length > 0 && (pos[-1] == ';' || isspace(pos[-1])))
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    {
      pos--;
      packet_length--;
    }
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    /* We must allocate some extra memory for query cache */
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    if (!(thd->query= (char*) thd->memdup_w_gap((gptr) (packet),
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						packet_length,
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						thd->db_length+2+
						sizeof(ha_rows))))
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      break;
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    thd->query[packet_length]=0;
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    thd->packet.shrink(thd->variables.net_buffer_length);// Reclaim some memory
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    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),QUERY_PRIOR);
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    mysql_log.write(thd,command,"%s",thd->query);
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    DBUG_PRINT("query",("%-.4096s",thd->query));
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    /* thd->query_length is set by mysql_parse() */
    mysql_parse(thd,thd->query,packet_length);
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    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),WAIT_PRIOR);
    DBUG_PRINT("info",("query ready"));
    break;
  }
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  case COM_FIELD_LIST:				// This isn't actually needed
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#ifdef DONT_ALLOW_SHOW_COMMANDS
    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
    break;
#else
  {
    char *fields;
    TABLE_LIST table_list;
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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))
    {
      send_error(net,ER_NO_DB_ERROR);
      break;
    }
    thd->free_list=0;
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    table_list.alias= table_list.real_name= thd->strdup(packet);
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    packet=strend(packet)+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)
      casedn_str(table_list.real_name);
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    remove_escape(table_list.real_name);	// This can't have wildcards

    if (check_access(thd,SELECT_ACL,table_list.db,&thd->col_access))
      break;
    table_list.grant.privilege=thd->col_access;
    if (grant_option && check_grant(thd,SELECT_ACL,&table_list,2))
      break;
    mysqld_list_fields(thd,&table_list,fields);
    free_items(thd);
    break;
  }
#endif
  case COM_QUIT:
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    /* We don't calculate statistics for this command */
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    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))
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      {
	net_printf(&thd->net,ER_WRONG_DB_NAME, db ? db : "NULL");
	break;
      }
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      if (check_access(thd,CREATE_ACL,db,0,1))
	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);
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      // null test to handle EOM
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      if (!db || !strip_sp(db) || check_db_name(db))
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      {
	net_printf(&thd->net,ER_WRONG_DB_NAME, db ? db : "NULL");
	break;
      }
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      if (check_access(thd,DROP_ACL,db,0,1))
	break;
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      if (thd->locked_tables || thd->active_transaction())
      {
	send_error(&thd->net,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;
    }
  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;
    }
  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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      /* error sending is deferred to reload_acl_and_cache */
      reload_acl_and_cache(thd, options, (TABLE_LIST*) 0) ;
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      break;
    }
  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"));
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    mysql_log.write(thd,command,NullS);
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    send_eof(net);
#ifdef __WIN__
    sleep(1);					// must wait after eof()
#endif
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#ifndef OS2
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    send_eof(net);				// This is for 'quit request'
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#endif
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    close_connection(net);
    close_thread_tables(thd);			// Free before kill
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    free_root(&thd->mem_root,MYF(0));
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    free_root(&thd->transaction.mem_root,MYF(0));
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    kill_mysql();
    error=TRUE;
    break;

  case COM_STATISTICS:
  {
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    mysql_log.write(thd,command,NullS);
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    statistic_increment(com_stat[SQLCOM_SHOW_STATUS],&LOCK_status);
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    char buff[200];
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    ulong uptime = (ulong) (thd->start_time - start_time);
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    sprintf((char*) buff,
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	    "Uptime: %ld  Threads: %d  Questions: %lu  Slow queries: %ld  Opens: %ld  Flush tables: %ld  Open tables: %u  Queries per second avg: %.3f",
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	    uptime,
	    (int) thread_count,thd->query_id,long_query_count,
	    opened_tables,refresh_version, cached_tables(),
	    uptime ? (float)thd->query_id/(float)uptime : 0);
#ifdef SAFEMALLOC
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    if (sf_malloc_cur_memory)				// Using SAFEMALLOC
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      sprintf(strend(buff), "  Memory in use: %ldK  Max memory used: %ldK",
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	      (sf_malloc_cur_memory+1023L)/1024L,
	      (sf_malloc_max_memory+1023L)/1024L);
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 #endif
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    VOID(my_net_write(net, buff,(uint) strlen(buff)));
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    VOID(net_flush(net));
    break;
  }
  case COM_PING:
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    statistic_increment(com_other,&LOCK_status);
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    send_ok(net);				// Tell client we are alive
    break;
  case COM_PROCESS_INFO:
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    statistic_increment(com_stat[SQLCOM_SHOW_PROCESSLIST],&LOCK_status);
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    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
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      break;
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    mysql_log.write(thd,command,NullS);
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    mysqld_list_processes(thd,thd->master_access & PROCESS_ACL ? NullS :
			  thd->priv_user,0);
    break;
  case COM_PROCESS_KILL:
  {
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    statistic_increment(com_stat[SQLCOM_KILL],&LOCK_status);
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    ulong id=(ulong) uint4korr(packet);
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    kill_one_thread(thd,id);
    break;
  }
  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);
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    mysql_log.write(thd,command,NullS);
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    send_eof(net);
    break;
  case COM_SLEEP:
  case COM_CONNECT:				// Impossible here
  case COM_TIME:				// Impossible from client
  case COM_DELAYED_INSERT:
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  case COM_END:
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  default:
    send_error(net, ER_UNKNOWN_COM_ERROR);
    break;
  }
  if (thd->lock || thd->open_tables)
  {
    thd->proc_info="closing tables";
    close_thread_tables(thd);			/* Free tables */
  }

  if (thd->fatal_error)
    send_error(net,0);				// End of memory ?

  time_t start_of_query=thd->start_time;
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  thd->end_time();				// Set start time
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  /* If not reading from backup and if the query took too long */
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  if (!slow_command && !thd->user_time) // do not log 'slow_command' queries
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  {
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    thd->proc_info="logging slow query";

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    if ((ulong) (thd->start_time - thd->time_after_lock) >
	thd->variables.long_query_time ||
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	((thd->lex.select_lex.options &
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	  (QUERY_NO_INDEX_USED | QUERY_NO_GOOD_INDEX_USED)) &&
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	 (specialflag & SPECIAL_LONG_LOG_FORMAT)))
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    {
      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
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  free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
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  DBUG_RETURN(error);
}

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

void
mysql_execute_command(void)
{
  int	res=0;
  THD	*thd=current_thd;
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  LEX	*lex= &thd->lex;
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  TABLE_LIST *tables=(TABLE_LIST*) lex->select_lex.table_list.first;
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  SELECT_LEX *select_lex = lex->select;
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  DBUG_ENTER("mysql_execute_command");

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  if (thd->slave_thread)
  {
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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));
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      DBUG_VOID_RETURN;
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    }
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#ifndef TO_BE_DELETED
    /*
       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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    if (lex->sql_command == SQLCOM_SELECT)
    {
      lex->sql_command = SQLCOM_DO;
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      lex->insert_list = &select_lex->item_list;
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    }
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#endif
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  }
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  if (lex->select_lex.next &&
      create_total_list(thd,lex,&tables,
			(lex->sql_command == SQLCOM_CREATE_TABLE)))
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    DBUG_VOID_RETURN;
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  /*
    When option readonly is set deny operations which change tables.
    Except for the replication thread and the 'super' users.
  */
  if (opt_readonly &&
      !(thd->slave_thread || (thd->master_access & SUPER_ACL)) &&
      (uc_update_queries[lex->sql_command] > 0))
  {
    send_error(&thd->net,ER_CANT_UPDATE_WITH_READLOCK);
    DBUG_VOID_RETURN;
  }
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  statistic_increment(com_stat[lex->sql_command],&LOCK_status);
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  switch (lex->sql_command) {
  case SQLCOM_SELECT:
  {
    select_result *result;
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    if (select_lex->options & SELECT_DESCRIBE)
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      lex->exchange=0;
    if (tables)
    {
      res=check_table_access(thd,
			     lex->exchange ? SELECT_ACL | FILE_ACL :
			     SELECT_ACL,
			     tables);
    }
    else
      res=check_access(thd, lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL,
		       any_db);
    if (res)
    {
      res=0;
      break;					// Error message is given
    }

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    thd->offset_limit=select_lex->offset_limit;
    thd->select_limit=select_lex->select_limit+select_lex->offset_limit;
    if (thd->select_limit < select_lex->select_limit)
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      thd->select_limit= HA_POS_ERROR;		// no limit
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    if (thd->select_limit == HA_POS_ERROR)
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      select_lex->options&= ~OPTION_FOUND_ROWS;
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    if (lex->exchange)
    {
      if (lex->exchange->dumpfile)
      {
	if (!(result=new select_dump(lex->exchange)))
	{
	  res= -1;
	  break;
	}
      }
      else
      {
	if (!(result=new select_export(lex->exchange)))
	{
	  res= -1;
	  break;
	}
      }
    }
    else if (!(result=new select_send()))
    {
      res= -1;
#ifdef DELETE_ITEMS
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      delete select_lex->having;
      delete select_lex->where;
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#endif
      break;
    }
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    else
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    {
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      /*
	Normal select:
	Change lock if we are using SELECT HIGH PRIORITY,
	FOR UPDATE or IN SHARE MODE
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	TODO: Delete the following loop when locks is set by sql_yacc
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      */
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      TABLE_LIST *table;
      for (table = tables ; table ; table=table->next)
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	table->lock_type= lex->lock_option;
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    }

    if (!(res=open_and_lock_tables(thd,tables)))
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    {
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      query_cache_store_query(thd, tables);
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      res=handle_select(thd, lex, result);
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    }
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    else
      delete result;
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    break;
  }
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  case SQLCOM_DO:
    res=mysql_do(thd, *lex->insert_list);
    break;

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  case SQLCOM_EMPTY_QUERY:
    send_ok(&thd->net);
    break;

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  case SQLCOM_PURGE:
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  {
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    if (check_global_access(thd, SUPER_ACL))
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      goto error;
    res = purge_master_logs(thd, lex->to_log);
    break;
  }
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  case SQLCOM_SHOW_NEW_MASTER:
  {
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    if (check_global_access(thd, REPL_SLAVE_ACL))
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      goto error;
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    /* This query don't work now. See comment in repl_failsafe.cc */
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#ifndef WORKING_NEW_MASTER
    net_printf(&thd->net, ER_NOT_SUPPORTED_YET, "SHOW NEW MASTER");
    res= 1;
#else
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    res = show_new_master(thd);
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#endif
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    break;
  }
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  case SQLCOM_SHOW_SLAVE_HOSTS:
  {
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    if (check_global_access(thd, REPL_SLAVE_ACL))
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      goto error;
    res = show_slave_hosts(thd);
    break;
  }
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  case SQLCOM_SHOW_BINLOG_EVENTS:
  {
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    if (check_global_access(thd, REPL_SLAVE_ACL))
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      goto error;
    res = show_binlog_events(thd);
    break;
  }
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  case SQLCOM_BACKUP_TABLE:
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  {
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL, tables) ||
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	check_global_access(thd, FILE_ACL))
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      goto error; /* purecov: inspected */
    res = mysql_backup_table(thd, tables);
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    break;
  }
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  case SQLCOM_RESTORE_TABLE:
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  {
    if (check_db_used(thd,tables) ||
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	check_table_access(thd, INSERT_ACL, tables) ||
	check_global_access(thd, FILE_ACL))
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      goto error; /* purecov: inspected */
    res = mysql_restore_table(thd, tables);
    break;
  }
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#ifdef HAVE_REPLICATION
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  case SQLCOM_CHANGE_MASTER:
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  {
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    if (check_global_access(thd, SUPER_ACL))
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      goto error;
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    LOCK_ACTIVE_MI;
    res = change_master(thd,active_mi);
    UNLOCK_ACTIVE_MI;
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    break;
  }
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  case SQLCOM_SHOW_SLAVE_STAT:
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  {
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    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
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      goto error;
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    LOCK_ACTIVE_MI;
    res = show_master_info(thd,active_mi);
    UNLOCK_ACTIVE_MI;
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    break;
  }
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  case SQLCOM_SHOW_MASTER_STAT:
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  {
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    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
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      goto error;
    res = show_binlog_info(thd);
    break;
  }
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  case SQLCOM_LOAD_MASTER_DATA: // sync with master
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    if (check_global_access(thd, SUPER_ACL))
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      goto error;
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    if (end_active_trans(thd))
      res= -1;
    else
      res = load_master_data(thd);
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    break;
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#endif /* HAVE_REPLICATION */
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#ifdef HAVE_INNOBASE_DB
  case SQLCOM_SHOW_INNODB_STATUS:
    {
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      if (check_global_access(thd, SUPER_ACL))
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	goto error;
      res = innodb_show_status(thd);
      break;
    }
#endif
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#ifdef HAVE_REPLICATION
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  case SQLCOM_LOAD_MASTER_TABLE:
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  {
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    if (!tables->db)
      tables->db=thd->db;
    if (check_access(thd,CREATE_ACL,tables->db,&tables->grant.privilege))
      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)
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	goto error;
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    }
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    LOCK_ACTIVE_MI;
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    /*
      fetch_master_table will send the error to the client on failure.
      Give error if the table already exists.
    */
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    if (!fetch_master_table(thd, tables->db, tables->real_name,
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			    active_mi, 0, 0))
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    {
      send_ok(&thd->net);
    }
    UNLOCK_ACTIVE_MI;
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    break;
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  }
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#endif /* HAVE_REPLICATION */
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  case SQLCOM_CREATE_TABLE:
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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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    if (!tables->db)
      tables->db=thd->db;
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    if (check_access(thd,want_priv,tables->db,&tables->grant.privilege) ||
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	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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    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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    if (strlen(tables->real_name) > NAME_LEN)
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    {
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      net_printf(&thd->net, ER_WRONG_TABLE_NAME, tables->alias);
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      res=0;
      break;
    }
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#ifndef HAVE_READLINK
    lex->create_info.data_file_name=lex->create_info.index_file_name=0;
#else
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    /* Fix names if symlinked tables */
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    if (append_file_to_dir(thd, &lex->create_info.data_file_name,
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			   tables->real_name) ||
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	append_file_to_dir(thd,&lex->create_info.index_file_name,
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			   tables->real_name))
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    {
      res=-1;
      break;
    }
1637
#endif
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    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) &&
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	  check_dup(tables->db, tables->real_name, tables->next))
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      {
	net_printf(&thd->net,ER_INSERT_TABLE_USED,tables->real_name);
	DBUG_VOID_RETURN;
      }
      if (tables->next)
      {
1650
	TABLE_LIST *table;
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	if (check_table_access(thd, SELECT_ACL, tables->next))
	  goto error;				// Error message is given
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	/* TODO: Delete the following loop when locks is set by sql_yacc */
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	for (table = tables->next ; table ; table=table->next)
	  table->lock_type= lex->lock_option;
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      }
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      select_lex->options|= SELECT_NO_UNLOCK;
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      thd->offset_limit=select_lex->offset_limit;
      thd->select_limit=select_lex->select_limit+select_lex->offset_limit;
      if (thd->select_limit < select_lex->select_limit)
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	thd->select_limit= HA_POS_ERROR;		// No limit
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      /* 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
    {
      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); // do logging
      if (!res)
	send_ok(&thd->net);
    }
    break;
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  }
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  case SQLCOM_CREATE_INDEX:
    if (!tables->db)
      tables->db=thd->db;
    if (check_access(thd,INDEX_ACL,tables->db,&tables->grant.privilege))
      goto error; /* purecov: inspected */
    if (grant_option && check_grant(thd,INDEX_ACL,tables))
      goto error;
1696 1697 1698 1699
    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:
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  {
    LOCK_ACTIVE_MI;
    start_slave(thd,active_mi,1 /* net report*/);
    UNLOCK_ACTIVE_MI;
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    break;
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  }
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  case SQLCOM_SLAVE_STOP:
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  /*
    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,
1717
      so it waits for the client thread because t is locked by it.
1718
    - then the client thread does SLAVE STOP.
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      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.
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    To prevent that, refuse SLAVE STOP if the
    client thread has locked tables
  */
  if (thd->locked_tables || thd->active_transaction())
  {
    send_error(&thd->net,ER_LOCK_OR_ACTIVE_TRANSACTION);
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    break;
1728
  }
1729 1730 1731 1732
  {
    LOCK_ACTIVE_MI;
    stop_slave(thd,active_mi,1/* net report*/);
    UNLOCK_ACTIVE_MI;
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    break;
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  }
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#endif /* HAVE_REPLICATION */
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  case SQLCOM_ALTER_TABLE:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
    break;
#else
    {
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      ulong priv=0;
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      if (lex->name && (!lex->name[0] || strlen(lex->name) > NAME_LEN))
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      {
	net_printf(&thd->net,ER_WRONG_TABLE_NAME,lex->name);
	res=0;
	break;
      }
1750 1751
      if (!tables->db)
	tables->db=thd->db;
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      if (!select_lex->db)
	select_lex->db=tables->db;
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      if (check_access(thd,ALTER_ACL,tables->db,&tables->grant.privilege) ||
1755
	  check_access(thd,INSERT_ACL | CREATE_ACL,select_lex->db,&priv) ||
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	  check_merge_table_access(thd, tables->db, 
				   (TABLE_LIST *)
				   lex->create_info.merge_list.first))
	goto error;				/* purecov: inspected */
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      if (!tables->db)
	tables->db=thd->db;
      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;
1771
	  tmp_table.db=select_lex->db;
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	  tmp_table.grant.privilege=priv;
	  if (check_grant(thd,INSERT_ACL | CREATE_ACL,tables))
	    goto error;
	}
      }
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      /* 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 */
1780
      if (end_active_trans(thd))
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	res= -1;
      else
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      {
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	res= mysql_alter_table(thd, select_lex->db, lex->name,
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			       &lex->create_info,
			       tables, lex->create_list,
			       lex->key_list, lex->drop_list, lex->alter_list,
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                               (ORDER *) select_lex->order_list.first,
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			       lex->drop_primary, lex->duplicates,
			       lex->alter_keys_onoff, lex->simple_alter);
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      }
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      break;
    }
#endif
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  case SQLCOM_RENAME_TABLE:
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  {
    TABLE_LIST *table;
    if (check_db_used(thd,tables))
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      goto error;
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    for (table=tables ; table ; table=table->next->next)
    {
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      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
		       &table->grant.privilege) ||
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	  check_access(thd, INSERT_ACL | CREATE_ACL, table->next->db,
		       &table->next->grant.privilege))
	goto error;
      if (grant_option)
      {
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	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,
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			    INSERT_ACL | CREATE_ACL) &&
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	     check_grant(thd,INSERT_ACL | CREATE_ACL, &new_list)))
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	  goto error;
      }
    }
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    query_cache_invalidate3(thd, tables, 0);
1821 1822 1823
    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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  }
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  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
    DBUG_VOID_RETURN;
#else
    {
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      if (check_global_access(thd, SUPER_ACL))
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	goto error;
      res = show_binlogs(thd);
      break;
    }
#endif    
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  case SQLCOM_SHOW_CREATE:
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#ifdef DONT_ALLOW_SHOW_COMMANDS
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    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
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    DBUG_VOID_RETURN;
#else
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    {
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      if (check_db_used(thd, tables) ||
	  check_access(thd, SELECT_ACL | EXTRA_ACL, tables->db,
		       &tables->grant.privilege))
	goto error;
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      res = mysqld_show_create(thd, tables);
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      break;
    }
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#endif
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  case SQLCOM_REPAIR:
1854 1855 1856 1857 1858 1859 1860
  {
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables))
      goto error; /* purecov: inspected */
    res = mysql_repair_table(thd, tables, &lex->check_opt);
    break;
  }
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  case SQLCOM_CHECK:
1862 1863 1864 1865 1866 1867 1868
  {
    if (check_db_used(thd,tables) ||
	check_table_access(thd, SELECT_ACL | EXTRA_ACL , tables))
      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) ||
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables))
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      goto error; /* purecov: inspected */
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    res = mysql_analyze_table(thd, tables, &lex->check_opt);
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    break;
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  }
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  case SQLCOM_OPTIMIZE:
  {
    HA_CREATE_INFO create_info;
1881 1882
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables))
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      goto error; /* purecov: inspected */
1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897
    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;
      res= mysql_alter_table(thd, NullS, NullS, &create_info,
			     tables, lex->create_list,
			     lex->key_list, lex->drop_list, lex->alter_list,
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                             (ORDER *) 0,
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			     0,DUP_ERROR);
    }
    else
      res = mysql_optimize_table(thd, tables, &lex->check_opt);
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    break;
  }
  case SQLCOM_UPDATE:
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    TABLE_LIST *table;
    if (check_db_used(thd,tables))
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      goto error;
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    for (table=tables ; table ; table=table->next)
    {
      if (check_access(thd,UPDATE_ACL,table->db,&table->grant.privilege))
	goto error;
    }
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    if (grant_option && check_grant(thd,UPDATE_ACL,tables))
      goto error;
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    if (select_lex->item_list.elements != lex->value_list.elements)
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    {
      send_error(&thd->net,ER_WRONG_VALUE_COUNT);
      DBUG_VOID_RETURN;
    }
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    if (select_lex->table_list.elements == 1)
    {
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      res= mysql_update(thd,tables,
			select_lex->item_list,
			lex->value_list,
			select_lex->where,
			(ORDER *) select_lex->order_list.first,
			select_lex->select_limit,
			lex->duplicates);
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    }
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    else
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    {
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      const char *msg= 0;
      lex->sql_command= SQLCOM_MULTI_UPDATE;
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      if (select_lex->order_list.elements)
	msg="ORDER BY";
      else if (select_lex->select_limit && select_lex->select_limit !=
	       HA_POS_ERROR)
	msg="LIMIT";
      if (msg)
1941
      {
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	net_printf(&thd->net, ER_WRONG_USAGE, "UPDATE", msg);
	res= 1;
	break;
1945
      }
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      res= mysql_multi_update(thd,tables,
			      &select_lex->item_list,
			      &lex->value_list,
			      select_lex->where,
			      select_lex->options,
			      lex->duplicates);
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    }
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    break;
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  case SQLCOM_INSERT:
    if (check_access(thd,INSERT_ACL,tables->db,&tables->grant.privilege))
      goto error; /* purecov: inspected */
    if (grant_option && check_grant(thd,INSERT_ACL,tables))
      goto error;
    res = mysql_insert(thd,tables,lex->field_list,lex->many_values,
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		       lex->duplicates);
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    break;
  case SQLCOM_REPLACE:
1963
    if (check_access(thd,INSERT_ACL | DELETE_ACL,
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		     tables->db,&tables->grant.privilege))
      goto error; /* purecov: inspected */
1966
    if (grant_option && check_grant(thd,INSERT_ACL | DELETE_ACL,
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				    tables))

      goto error;
    res = mysql_insert(thd,tables,lex->field_list,lex->many_values,
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		       DUP_REPLACE);
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    break;
  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
1976

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    /*
      Check that we have modify privileges for the first table and
      select privileges for the rest
    */
1981
    {
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      ulong privilege= (lex->sql_command == SQLCOM_INSERT_SELECT ?
1983
			INSERT_ACL : INSERT_ACL | DELETE_ACL);
1984 1985 1986 1987 1988 1989 1990 1991 1992 1993
      TABLE_LIST *save_next=tables->next;
      tables->next=0;
      if (check_access(thd, privilege,
		       tables->db,&tables->grant.privilege) ||
	  (grant_option && check_grant(thd, privilege, tables)))
	goto error;
      tables->next=save_next;
      if ((res=check_table_access(thd, SELECT_ACL, save_next)))
	goto error;
    }
1994 1995
    /* Don't unlock tables until command is written to binary log */
    select_lex->options|= SELECT_NO_UNLOCK;
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    select_result *result;
1998 1999 2000
    thd->offset_limit=select_lex->offset_limit;
    thd->select_limit=select_lex->select_limit+select_lex->offset_limit;
    if (thd->select_limit < select_lex->select_limit)
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      thd->select_limit= HA_POS_ERROR;		// No limit

2003 2004 2005 2006 2007
    if (check_dup(tables->db, tables->real_name, tables->next))
    {
      /* Using same table for INSERT and SELECT */
      select_lex->options |= OPTION_BUFFER_RESULT;
    }
2008
    {
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      /* TODO: Delete the following loop when locks is set by sql_yacc */
2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
      TABLE_LIST *table;
      for (table = tables->next ; table ; table=table->next)
	table->lock_type= lex->lock_option;
    }

    /* 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);
    if (!(res=open_and_lock_tables(thd, tables)))
    {
      if ((result=new select_insert(tables->table,&lex->field_list,
2021
				    lex->duplicates)))
2022 2023 2024 2025
	res=handle_select(thd,lex,result);
    }
    else
      res= -1;
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    break;
  }
2028
  case SQLCOM_TRUNCATE:
2029 2030
    if (check_access(thd,DELETE_ACL,tables->db,&tables->grant.privilege))
      goto error; /* purecov: inspected */
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    if (grant_option && check_grant(thd,DELETE_ACL,tables))
      goto error;
2033 2034 2035 2036 2037 2038
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
    if (thd->locked_tables || thd->active_transaction())
    {
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      send_error(&thd->net,ER_LOCK_OR_ACTIVE_TRANSACTION,NullS);
2040 2041 2042 2043
      goto error;
    }
    res=mysql_truncate(thd,tables);
    break;
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  case SQLCOM_DELETE:
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  {
    if (check_access(thd,DELETE_ACL,tables->db,&tables->grant.privilege))
      goto error; /* purecov: inspected */
    if (grant_option && check_grant(thd,DELETE_ACL,tables))
      goto error;
    // Set privilege for the WHERE clause
    tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
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    res = mysql_delete(thd,tables, select_lex->where,
                       (ORDER*) select_lex->order_list.first,
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                       select_lex->select_limit, select_lex->options);
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    break;
  }
2057
  case SQLCOM_DELETE_MULTI:
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  {
    TABLE_LIST *aux_tables=(TABLE_LIST *)thd->lex.auxilliary_table_list.first;
    TABLE_LIST *auxi;
    uint table_count=0;
    multi_delete *result;
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    /* sql_yacc guarantees that tables and aux_tables are not zero */
    if (check_db_used(thd, tables) || check_db_used(thd,aux_tables) ||
	check_table_access(thd,SELECT_ACL, tables) || 
	check_table_access(thd,DELETE_ACL, aux_tables))
      goto error;
    if ((thd->options & OPTION_SAFE_UPDATES) && !select_lex->where)
    {		
      send_error(&thd->net,ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE);
      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)
      {
	net_printf(&thd->net,ER_NONUNIQ_TABLE,auxi->real_name);
	goto error;
      }
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      walk->lock_type= auxi->lock_type;
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      // Store address to table as we need it later
      auxi->table= my_reinterpret_cast(TABLE *) (walk);
2093 2094 2095
    }
    if (add_item_to_list(new Item_null()))
    {
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      res= -1;
2097
      break;
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    }
    tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
    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)
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      auxi->table= (my_reinterpret_cast(TABLE_LIST*) (auxi->table))->table;

2107 2108
    if (!thd->fatal_error && (result= new multi_delete(thd,aux_tables,
						       table_count)))
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    {
      res=mysql_select(thd,tables,select_lex->item_list,
2111
		       select_lex->where,
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		       (ORDER *)NULL,(ORDER *)NULL,(Item *)NULL,
		       (ORDER *)NULL,
		       select_lex->options | thd->options |
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		       SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK,
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		       result);
2117
      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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  {
    if (check_table_access(thd,DROP_ACL,tables))
      goto error;				/* purecov: inspected */
2128 2129 2130 2131 2132 2133 2134 2135 2136 2137
    /*
      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_temporary)
      lex->drop_if_exists= 1;
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    if (end_active_trans(thd))
      res= -1;
    else
      res = mysql_rm_table(thd,tables,lex->drop_if_exists);
  }
  break;
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  case SQLCOM_DROP_INDEX:
    if (!tables->db)
      tables->db=thd->db;
    if (check_access(thd,INDEX_ACL,tables->db,&tables->grant.privilege))
      goto error;				/* purecov: inspected */
    if (grant_option && check_grant(thd,INDEX_ACL,tables))
      goto error;
2151 2152 2153 2154
    if (end_active_trans(thd))
      res= -1;
    else
      res = mysql_drop_index(thd, tables, lex->drop_list);
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    break;
  case SQLCOM_SHOW_DATABASES:
2157
#if defined(DONT_ALLOW_SHOW_COMMANDS)
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    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND);   /* purecov: inspected */
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    DBUG_VOID_RETURN;
#else
    if ((specialflag & SPECIAL_SKIP_SHOW_DB) &&
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	check_global_access(thd, SHOW_DB_ACL))
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      goto error;
    res= mysqld_show_dbs(thd, (lex->wild ? lex->wild->ptr() : NullS));
    break;
#endif
  case SQLCOM_SHOW_PROCESSLIST:
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    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
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      break;
    mysqld_list_processes(thd,thd->master_access & PROCESS_ACL ? NullS :
			  thd->priv_user,lex->verbose);
    break;
  case SQLCOM_SHOW_STATUS:
2174
    res= mysqld_show(thd,(lex->wild ? lex->wild->ptr() : NullS),status_vars,
2175
		     OPT_GLOBAL, &LOCK_status);
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    break;
  case SQLCOM_SHOW_VARIABLES:
    res= mysqld_show(thd, (lex->wild ? lex->wild->ptr() : NullS),
2179 2180
		     init_vars, lex->option_type,
		     &LOCK_global_system_variables);
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    break;
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  case SQLCOM_SHOW_LOGS:
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  {
    res= mysqld_show_logs(thd);
    break;
  }
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  case SQLCOM_SHOW_TABLES:
2188
    /* FALL THROUGH */
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#ifdef DONT_ALLOW_SHOW_COMMANDS
    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
    DBUG_VOID_RETURN;
#else
    {
2194
      char *db=select_lex->db ? select_lex->db : thd->db;
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      if (!db)
      {
	send_error(&thd->net,ER_NO_DB_ERROR);	/* purecov: inspected */
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);				// Fix escaped '_'
2201
      if (check_db_name(db))
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      {
2203 2204
        net_printf(&thd->net,ER_WRONG_DB_NAME, db);
        goto error;
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      }
      if (check_access(thd,SELECT_ACL,db,&thd->col_access))
	goto error;				/* purecov: inspected */
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      if (!thd->col_access && check_grant_db(thd,db))
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      {
	net_printf(&thd->net,ER_DBACCESS_DENIED_ERROR,
		   thd->priv_user,
		   thd->priv_host,
		   db);
	goto error;
      }
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      /* grant is checked in mysqld_show_tables */
2217
      if (select_lex->options & SELECT_DESCRIBE)
2218
        res= mysqld_extend_show_tables(thd,db,
2219
				       (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
2226 2227 2228
  case SQLCOM_SHOW_OPEN_TABLES:
    res= mysqld_show_open_tables(thd,(lex->wild ? lex->wild->ptr() : NullS));
    break;
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  case SQLCOM_SHOW_FIELDS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
    DBUG_VOID_RETURN;
#else
    {
2235 2236
      char *db=tables->db;
      if (!*db)
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      {
	send_error(&thd->net,ER_NO_DB_ERROR);	/* purecov: inspected */
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);			// Fix escaped '_'
2242
      remove_escape(tables->real_name);
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      if (check_access(thd,SELECT_ACL | EXTRA_ACL,db,&thd->col_access))
	goto error;				/* purecov: inspected */
      tables->grant.privilege=thd->col_access;
      if (grant_option && check_grant(thd,SELECT_ACL,tables,2))
	goto error;
      res= mysqld_show_fields(thd,tables,
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			      (lex->wild ? lex->wild->ptr() : NullS),
			      lex->verbose);
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      break;
    }
#endif
  case SQLCOM_SHOW_KEYS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
    DBUG_VOID_RETURN;
#else
    {
2260
      char *db=tables->db;
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      if (!db)
      {
	send_error(&thd->net,ER_NO_DB_ERROR);	/* purecov: inspected */
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);			// Fix escaped '_'
2267
      remove_escape(tables->real_name);
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      if (!tables->db)
	tables->db=thd->db;
      if (check_access(thd,SELECT_ACL,db,&thd->col_access))
	goto error; /* purecov: inspected */
      tables->grant.privilege=thd->col_access;
      if (grant_option && check_grant(thd,SELECT_ACL,tables,2))
	goto error;
      res= mysqld_show_keys(thd,tables);
      break;
    }
#endif
  case SQLCOM_CHANGE_DB:
2280
    mysql_change_db(thd,select_lex->db);
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    break;
  case SQLCOM_LOAD:
  {
    uint privilege= (lex->duplicates == DUP_REPLACE ?
		     INSERT_ACL | UPDATE_ACL | DELETE_ACL : INSERT_ACL);
2286 2287

    if (!lex->local_file)
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    {
      if (check_access(thd,privilege | FILE_ACL,tables->db))
	goto error;
    }
    else
    {
2294
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
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	  ! opt_local_infile)
2296 2297 2298 2299
      {
	send_error(&thd->net,ER_NOT_ALLOWED_COMMAND);
	goto error;
      }
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      if (check_access(thd,privilege,tables->db,&tables->grant.privilege) ||
2301
	  grant_option && check_grant(thd,privilege,tables))
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	goto error;
    }
    res=mysql_load(thd, lex->exchange, tables, lex->field_list,
		   lex->duplicates, (bool) lex->local_file, lex->lock_option);
    break;
  }
  case SQLCOM_SET_OPTION:
2309
    if (!(res=sql_set_variables(thd, &lex->var_list)))
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      send_ok(&thd->net);
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    break;
  case SQLCOM_UNLOCK_TABLES:
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    unlock_locked_tables(thd);
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    if (thd->options & OPTION_TABLE_LOCK)
    {
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      end_active_trans(thd);
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      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
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    }
    if (thd->global_read_lock)
2320
      unlock_global_read_lock(thd);
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    send_ok(&thd->net);
    break;
  case SQLCOM_LOCK_TABLES:
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    unlock_locked_tables(thd);
2325
    if (check_db_used(thd,tables) || end_active_trans(thd))
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      goto error;
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    if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, tables))
2328
      goto error;
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    thd->in_lock_tables=1;
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    thd->options|= OPTION_TABLE_LOCK;
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    if (!(res=open_and_lock_tables(thd,tables)))
    {
      thd->locked_tables=thd->lock;
      thd->lock=0;
      send_ok(&thd->net);
    }
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    else
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
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    thd->in_lock_tables=0;
    break;
  case SQLCOM_CREATE_DB:
2342
  {
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    if (!strip_sp(lex->name) || check_db_name(lex->name))
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    {
2345
      net_printf(&thd->net,ER_WRONG_DB_NAME, lex->name);
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      break;
    }
2348 2349 2350 2351 2352 2353 2354 2355 2356 2357
    /*
      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.
    */
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
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    {
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
2360
      break;
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    }
2362

2363 2364
    if (check_access(thd,CREATE_ACL,lex->name,0,1))
      break;
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    res=mysql_create_db(thd,lex->name,lex->create_info.options,0);
2366 2367
    break;
  }
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  case SQLCOM_DROP_DB:
2369
  {
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    if (!strip_sp(lex->name) || check_db_name(lex->name))
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    {
2372
      net_printf(&thd->net,ER_WRONG_DB_NAME, lex->name);
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      break;
    }
2375 2376 2377 2378 2379 2380 2381 2382 2383 2384
    /*
      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.
    */
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
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    {
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
2387
      break;
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    }
2389
    if (check_access(thd,DROP_ACL,lex->name,0,1))
2390
      break;
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    if (thd->locked_tables || thd->active_transaction())
    {
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      send_error(&thd->net,ER_LOCK_OR_ACTIVE_TRANSACTION);
2394 2395
      goto error;
    }
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    res=mysql_rm_db(thd,lex->name,lex->drop_if_exists,0);
2397 2398
    break;
  }
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  case SQLCOM_CREATE_FUNCTION:
    if (check_access(thd,INSERT_ACL,"mysql",0,1))
      break;
#ifdef HAVE_DLOPEN
    if (!(res = mysql_create_function(thd,&lex->udf)))
      send_ok(&thd->net);
#else
    res= -1;
#endif
    break;
  case SQLCOM_DROP_FUNCTION:
    if (check_access(thd,DELETE_ACL,"mysql",0,1))
      break;
#ifdef HAVE_DLOPEN
    if (!(res = mysql_drop_function(thd,lex->udf.name)))
      send_ok(&thd->net);
#else
    res= -1;
#endif
    break;
2419 2420 2421 2422 2423 2424 2425 2426 2427
  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,
		     tables ? 0 : 1))
      goto error;

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    /*
      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
    */
2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456

    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 &&
	     my_strcasecmp(user->host.str, thd->host_or_ip)))
	{
	  if (check_access(thd, UPDATE_ACL, "mysql",0,1))
	    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;
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      if (!(res = mysql_table_grant(thd,tables,lex->users_list, lex->columns,
				    lex->grant,
				    lex->sql_command == SQLCOM_REVOKE)))
2460
      {
2461
	mysql_update_log.write(thd, thd->query, thd->query_length);
2462 2463
	if (mysql_bin_log.is_open())
	{
2464
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
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	  mysql_bin_log.write(&qinfo);
	}
      }
    }
    else
    {
      if (lex->columns.elements)
      {
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	send_error(&thd->net,ER_ILLEGAL_GRANT_FOR_TABLE);
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	res=1;
      }
      else
	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
			  lex->sql_command == SQLCOM_REVOKE);
      if (!res)
      {
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	mysql_update_log.write(thd, thd->query, thd->query_length);
2482 2483
	if (mysql_bin_log.is_open())
	{
2484
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
2485 2486
	  mysql_bin_log.write(&qinfo);
	}
2487
	if (mqh_used && lex->sql_command == SQLCOM_GRANT)
2488
	{
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	  List_iterator <LEX_USER> str_list(lex->users_list);
	  LEX_USER *user;
	  while ((user=str_list++))
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	    reset_mqh(thd,user);
2493
	}
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      }
    }
    break;
  }
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  case SQLCOM_FLUSH:
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  case SQLCOM_RESET:
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    if (check_global_access(thd,RELOAD_ACL) || check_db_used(thd, tables))
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      goto error;
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    /* error sending is deferred to reload_acl_and_cache */
    reload_acl_and_cache(thd, lex->type, tables) ;
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    break;
  case SQLCOM_KILL:
    kill_one_thread(thd,lex->thread_id);
    break;
  case SQLCOM_SHOW_GRANTS:
    res=0;
2510 2511
    if ((thd->priv_user &&
	 !strcmp(thd->priv_user,lex->grant_user->user.str)) ||
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	!check_access(thd, SELECT_ACL, "mysql",0,1))
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    {
      res = mysql_show_grants(thd,lex->grant_user);
    }
    break;
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  case SQLCOM_HA_OPEN:
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    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL, tables))
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      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:
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    /*
      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.
    */
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    if (check_db_used(thd,tables))
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      goto error;
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    res = mysql_ha_read(thd, tables, lex->ha_read_mode, lex->backup_dir,
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			lex->insert_list, lex->ha_rkey_mode, select_lex->where,
			select_lex->select_limit, select_lex->offset_limit);
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    break;

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  case SQLCOM_BEGIN:
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    if (thd->locked_tables)
    {
      thd->lock=thd->locked_tables;
      thd->locked_tables=0;			// Will be automaticly closed
      close_thread_tables(thd);			// Free tables
    }
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    if (end_active_trans(thd))
    {
      res= -1;
    }
    else
    {
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      thd->options= ((thd->options & (ulong) ~(OPTION_STATUS_NO_TRANS_UPDATE)) |
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		     OPTION_BEGIN);
      thd->server_status|= SERVER_STATUS_IN_TRANS;
      send_ok(&thd->net);
    }
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    break;
  case SQLCOM_COMMIT:
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    /*
      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...)
    */
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  {
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    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
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    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    if (!ha_commit(thd))
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    {
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      send_ok(&thd->net);
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    }
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    else
      res= -1;
    break;
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  }
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  case SQLCOM_ROLLBACK:
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    if (!ha_rollback(thd))
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    {
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      /*
        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)
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	send_warning(&thd->net,ER_WARNING_NOT_COMPLETE_ROLLBACK,0);
      else
	send_ok(&thd->net);
    }
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    else
      res= -1;
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    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
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    break;
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  case SQLCOM_ROLLBACK_TO_SAVEPOINT:
    if (!ha_rollback_to_savepoint(thd, lex->savepoint_name))
    {
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      if ((thd->options & OPTION_STATUS_NO_TRANS_UPDATE) && !thd->slave_thread)
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	send_warning(&thd->net,ER_WARNING_NOT_COMPLETE_ROLLBACK,0);
      else
	send_ok(&thd->net);
    }
    else
      res= -1;
    break;
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  case SQLCOM_SAVEPOINT:
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    if (!ha_savepoint(thd, lex->savepoint_name))
      send_ok(&thd->net);
    else
      res= -1;
2615
    break;
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  default:					/* Impossible */
    send_ok(&thd->net);
    break;
  }
  thd->proc_info="query end";			// QQ
  if (res < 0)
    send_error(&thd->net,thd->killed ? ER_SERVER_SHUTDOWN : 0);

error:
  DBUG_VOID_RETURN;
}


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

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

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

bool
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check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
2650
	     bool dont_check_global_grants, bool no_errors)
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{
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  DBUG_ENTER("check_access");
  DBUG_PRINT("enter",("want_access: %lu  master_access: %lu", want_access,
		      thd->master_access));
  ulong db_access,dummy;
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  if (save_priv)
    *save_priv=0;
  else
    save_priv= &dummy;

2661
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
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  {
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    if (!no_errors)
      send_error(&thd->net,ER_NO_DB_ERROR);	/* purecov: tested */
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    DBUG_RETURN(TRUE);				/* purecov: tested */
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  }

  if ((thd->master_access & want_access) == want_access)
  {
2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680
    /*
      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,
			thd->priv_user, db); /* purecov: inspected */
    *save_priv=thd->master_access | db_access;
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    DBUG_RETURN(FALSE);
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  }
2683
  if (((want_access & ~thd->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
2684
      ! db && dont_check_global_grants)
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  {						// We can never grant this
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    if (!no_errors)
      net_printf(&thd->net,ER_ACCESS_DENIED_ERROR,
		 thd->priv_user,
2689
		 thd->priv_host,
2690
		 thd->password ? ER(ER_YES) : ER(ER_NO));/* purecov: tested */
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    DBUG_RETURN(TRUE);				/* purecov: tested */
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  }

  if (db == any_db)
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    DBUG_RETURN(FALSE);				// Allow select on anything
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  if (db && (!thd->db || strcmp(db,thd->db)))
    db_access=acl_get(thd->host, thd->ip, (char*) &thd->remote.sin_addr,
		      thd->priv_user, db); /* purecov: inspected */
  else
    db_access=thd->db_access;
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  // Remove SHOW attribute and access rights we already have
  want_access &= ~(thd->master_access | EXTRA_ACL);
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  db_access= ((*save_priv=(db_access | thd->master_access)) & want_access);
2705 2706

  /* grant_option is set if there exists a single table or column grant */
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  if (db_access == want_access ||
2708
      ((grant_option && !dont_check_global_grants) &&
2709
       !(want_access & ~(db_access | TABLE_ACLS))))
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    DBUG_RETURN(FALSE);				/* Ok */
2711 2712 2713
  if (!no_errors)
    net_printf(&thd->net,ER_DBACCESS_DENIED_ERROR,
	       thd->priv_user,
2714
	       thd->priv_host,
2715
	       db ? db : thd->db ? thd->db : "unknown"); /* purecov: tested */
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  DBUG_RETURN(TRUE);				/* purecov: tested */
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}


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

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

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

  RETURN
    0	ok
    1	Access denied.  In this case an error is sent to the client
*/
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bool check_global_access(THD *thd, ulong want_access)
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{
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  char command[128];
2742
  if ((thd->master_access & want_access))
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    return 0;
  get_privilege_desc(command, sizeof(command), want_access);
  net_printf(&thd->net,ER_SPECIFIC_ACCESS_DENIED_ERROR,
	     command);
  return 1;
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}


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

2756
bool
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check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
2758
		   bool no_errors)
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{
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  uint found=0;
  ulong found_access=0;
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  TABLE_LIST *org_tables=tables;
  for (; tables ; tables=tables->next)
  {
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    if ((thd->master_access & want_access) == (want_access & ~EXTRA_ACL) &&
	thd->db)
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      tables->grant.privilege= want_access;
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    else if (tables->db && tables->db == thd->db)
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    {
      if (found && !grant_option)		// db already checked
	tables->grant.privilege=found_access;
      else
      {
2774 2775
	if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
			 0, no_errors))
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	  return TRUE;				// Access denied
	found_access=tables->grant.privilege;
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	found=1;
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      }
    }
2781
    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
2782
			  0, no_errors))
2783
      return TRUE;
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  }
  if (grant_option)
2786
    return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
2787
		       test(want_access & EXTRA_ACL), no_errors);
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  return FALSE;
}


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


2809 2810
static bool check_merge_table_access(THD *thd, char *db,
				     TABLE_LIST *table_list)
2811 2812 2813 2814
{
  int error=0;
  if (table_list)
  {
2815
    /* Check that all tables use the current database */
2816 2817
    TABLE_LIST *tmp;
    for (tmp=table_list; tmp ; tmp=tmp->next)
2818 2819 2820
    {
      if (!tmp->db || !tmp->db[0])
	tmp->db=db;
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      else if (strcmp(tmp->db,db))
2822 2823 2824 2825 2826
      {
	send_error(&thd->net,ER_UNION_TABLES_IN_DIFFERENT_DIR);
	return 1;
      }
    }
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    error=check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
			     table_list);
  }
  return error;
}


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

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

2844
#ifndef EMBEDDED_LIBRARY
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bool check_stack_overrun(THD *thd,char *buf __attribute__((unused)))
{
  long stack_used;
  if ((stack_used=used_stack(thd->thread_stack,(char*) &stack_used)) >=
      (long) thread_stack_min)
  {
    sprintf(errbuff[0],ER(ER_STACK_OVERRUN),stack_used,thread_stack);
    my_message(ER_STACK_OVERRUN,errbuff[0],MYF(0));
    thd->fatal_error=1;
    return 1;
  }
  return 0;
}
2858
#endif /* EMBEDDED_LIBRARY */
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#define MY_YACC_INIT 1000			// Start with big alloc
#define MY_YACC_MAX  32000			// Because of 'short'

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


/****************************************************************************
2893
	Initialize global thd variables needed for query
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****************************************************************************/

static void
mysql_init_query(THD *thd)
{
  DBUG_ENTER("mysql_init_query");
2900
  thd->lex.select_lex.item_list.empty();
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  thd->lex.value_list.empty();
2902
  thd->lex.select_lex.table_list.elements=0;
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  thd->free_list=0;  thd->lex.union_option=0;
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  thd->lex.select = &thd->lex.select_lex;
  thd->lex.select_lex.table_list.first=0;
  thd->lex.select_lex.table_list.next= (byte**) &thd->lex.select_lex.table_list.first;
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  thd->lex.select_lex.next=0;
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  /*
    select_lex.options is also inited in dispatch_command(), but for
    replication (which bypasses dispatch_command() and calls mysql_parse()
    directly) we must do it here.
  */
  thd->lex.select_lex.options=0;
2914
  thd->lex.olap=0;
2915
  thd->lex.select->olap= UNSPECIFIED_OLAP_TYPE;
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  thd->fatal_error=0;				// Safety
  thd->last_insert_id_used=thd->query_start_used=thd->insert_id_used=0;
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  thd->rand_used=0;
2919
  thd->sent_row_count=thd->examined_row_count=0;
2920
  thd->safe_to_cache_query=1;
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  DBUG_VOID_RETURN;
}

2924 2925 2926
void
mysql_init_select(LEX *lex)
{
2927 2928
  SELECT_LEX *select_lex = lex->select;
  select_lex->where=select_lex->having=0;
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  select_lex->select_limit= lex->thd->variables.select_limit;
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  select_lex->offset_limit=0;
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  select_lex->options=0;
  select_lex->linkage=UNSPECIFIED_TYPE;
2933
  select_lex->olap=   UNSPECIFIED_OLAP_TYPE;
2934
  lex->exchange = 0;
2935
  lex->proc_list.first=0;
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  select_lex->order_list.empty();
  select_lex->group_list.empty();
2938
  select_lex->next = (SELECT_LEX *)NULL; 
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}

2941

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bool
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mysql_new_select(LEX *lex)
{
2945
  SELECT_LEX *select_lex = (SELECT_LEX *) lex->thd->calloc(sizeof(SELECT_LEX));
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  if (!select_lex)
    return 1;
2948
  lex->select->next=select_lex; 
2949
  lex->select=select_lex;
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  select_lex->table_list.next= (byte**) &select_lex->table_list.first;
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  select_lex->item_list.empty();
  select_lex->when_list.empty(); 
  select_lex->expr_list.empty();
  select_lex->interval_list.empty(); 
  select_lex->use_index.empty();
  select_lex->ftfunc_list.empty();
  return 0;
2958
}
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2960

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void mysql_init_multi_delete(LEX *lex)
{
  lex->sql_command =  SQLCOM_DELETE_MULTI;
  mysql_init_select(lex);
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  lex->select->select_limit=lex->thd->select_limit=HA_POS_ERROR;
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  lex->select->table_list.save_and_clear(&lex->auxilliary_table_list);
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}
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void
mysql_parse(THD *thd,char *inBuf,uint length)
{
  DBUG_ENTER("mysql_parse");

  mysql_init_query(thd);
  thd->query_length = length;
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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);
    if (!yyparse() && ! thd->fatal_error)
    {
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      if (mqh_used && thd->user_connect &&
	  check_mqh(thd, thd->lex.sql_command))
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      {
	thd->net.error = 0;
      }
      else
      {
	mysql_execute_command();
	query_cache_end_of_result(&thd->net);
      }
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    }
    else
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    {
      DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
			 thd->fatal_error));
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      query_cache_abort(&thd->net);
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    }
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    thd->proc_info="freeing items";
    free_items(thd);  /* Free strings used by items */
    lex_end(lex);
  }
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  DBUG_VOID_RETURN;
}


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

bool add_field_to_list(char *field_name, enum_field_types type,
		       char *length, char *decimals,
		       uint type_modifier, Item *default_value,char *change,
		       TYPELIB *interval)
{
  register create_field *new_field;
  THD	*thd=current_thd;
  LEX  *lex= &thd->lex;
  uint allowed_type_modifier=0;
  DBUG_ENTER("add_field_to_list");

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

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  if (default_value)
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  {
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    if (default_value->type() == Item::NULL_ITEM)
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    {
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      default_value=0;
      if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) ==
	  NOT_NULL_FLAG)
      {
	net_printf(&thd->net,ER_INVALID_DEFAULT,field_name);
	DBUG_RETURN(1);
      }
    }
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#ifdef MYSQL41000
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    else if (type_modifier & AUTO_INCREMENT_FLAG)
    {
      net_printf(&thd->net, ER_INVALID_DEFAULT, field_name);
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      DBUG_RETURN(1);
    }
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#endif
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  }
  if (!(new_field=new create_field()))
    DBUG_RETURN(1);
  new_field->field=0;
  new_field->field_name=field_name;
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#ifdef MYSQL41000
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  new_field->def= default_value;
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#else
  new_field->def= (type_modifier & AUTO_INCREMENT_FLAG ? 0 : default_value);
#endif
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  new_field->flags= type_modifier;
  new_field->unireg_check= (type_modifier & AUTO_INCREMENT_FLAG ?
			    Field::NEXT_NUMBER : Field::NONE);
  new_field->decimals= decimals ? (uint) set_zone(atoi(decimals),0,
						  NOT_FIXED_DEC-1) : 0;
  new_field->sql_type=type;
  new_field->length=0;
  new_field->change=change;
  new_field->interval=0;
  new_field->pack_length=0;
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  if (length && !(new_field->length= (uint) atoi(length)))
    length=0; /* purecov: inspected */
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  uint sign_len=type_modifier & UNSIGNED_FLAG ? 0 : 1;

  if (new_field->length && new_field->decimals &&
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      new_field->length < new_field->decimals+1 &&
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      new_field->decimals != NOT_FIXED_DEC)
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    new_field->length=new_field->decimals+1; /* purecov: inspected */
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  switch (type) {
  case FIELD_TYPE_TINY:
    if (!length) new_field->length=3+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_SHORT:
    if (!length) new_field->length=5+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_INT24:
    if (!length) new_field->length=8+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_LONG:
    if (!length) new_field->length=10+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_LONGLONG:
    if (!length) new_field->length=20;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_STRING:
  case FIELD_TYPE_VAR_STRING:
  case FIELD_TYPE_NULL:
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  case FIELD_TYPE_GEOMETRY:
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    break;
  case FIELD_TYPE_DECIMAL:
    if (!length)
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      new_field->length= 10;			// Default length for DECIMAL
    if (new_field->length < MAX_FIELD_WIDTH)	// Skip wrong argument
    {
      new_field->length+=sign_len;
      if (new_field->decimals)
	new_field->length++;
    }
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    break;
  case FIELD_TYPE_BLOB:
  case FIELD_TYPE_TINY_BLOB:
  case FIELD_TYPE_LONG_BLOB:
  case FIELD_TYPE_MEDIUM_BLOB:
    if (default_value)				// Allow empty as default value
    {
      String str,*res;
      res=default_value->val_str(&str);
      if (res->length())
      {
	net_printf(&thd->net,ER_BLOB_CANT_HAVE_DEFAULT,field_name); /* purecov: inspected */
	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)
      {
	net_printf(&thd->net,ER_WRONG_FIELD_SPEC,field_name);
	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)
      {
	net_printf(&thd->net,ER_TOO_BIG_SET,field_name); /* purecov: inspected */
	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)
      {
	thd->cuted_fields=0;
	String str,*res;
	res=default_value->val_str(&str);
	(void) find_set(interval,res->ptr(),res->length());
	if (thd->cuted_fields)
	{
	  net_printf(&thd->net,ER_INVALID_DEFAULT,field_name);
	  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()))
	{
	  net_printf(&thd->net,ER_INVALID_DEFAULT,field_name);
	  DBUG_RETURN(1);
	}
      }
      break;
    }
  }

  if (new_field->length >= MAX_FIELD_WIDTH ||
      (!new_field->length && !(new_field->flags & BLOB_FLAG) &&
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       type != FIELD_TYPE_STRING && type != FIELD_TYPE_VAR_STRING))
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  {
    net_printf(&thd->net,ER_TOO_BIG_FIELDLENGTH,field_name,
	       MAX_FIELD_WIDTH-1);		/* purecov: inspected */
    DBUG_RETURN(1);				/* purecov: inspected */
  }
  type_modifier&= AUTO_INCREMENT_FLAG;
  if ((~allowed_type_modifier) & type_modifier)
  {
    net_printf(&thd->net,ER_WRONG_FIELD_SPEC,field_name);
    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;

  if (!(order = (ORDER *) sql_alloc(sizeof(ORDER)+sizeof(Item*))))
    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 */
    if (use_mb(default_charset_info) &&
        (l = my_ismbchar(default_charset_info, name, strend)))
    {
	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
****************************************************************************/


bool add_to_list(SQL_LIST &list,Item *item,bool asc)
{
  ORDER *order;
  Item	**item_ptr;
  DBUG_ENTER("add_to_list");
  if (!(order = (ORDER *) sql_alloc(sizeof(ORDER)+sizeof(Item*))))
    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 *add_table_to_list(Table_ident *table, LEX_STRING *alias,
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			      ulong table_options,
			      thr_lock_type lock_type,
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			      List<String> *use_index,
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			      List<String> *ignore_index)
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{
  register TABLE_LIST *ptr;
  THD	*thd=current_thd;
  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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  {
    net_printf(&thd->net,ER_WRONG_TABLE_NAME,table->table.str);
    DBUG_RETURN(0);
  }

  if (!alias)					/* Alias is case sensitive */
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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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  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) 
  {
    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
  {
    ptr->db= (char*) "";
    ptr->db_length= 0;
  }
    
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  ptr->alias= alias_str;
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  table_case_convert(table->table.str, table->table.length);
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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;
  ptr->updating=    test(table_options & TL_OPTION_UPDATING);
  ptr->force_index= test(table_options & TL_OPTION_FORCE_INDEX);
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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*) thd->lex.select->table_list.first ;
	 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->net,ER_NONUNIQ_TABLE,alias_str); /* purecov: tested */
	DBUG_RETURN(0);				/* purecov: tested */
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      }
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    }
  }
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  thd->lex.select->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
*/

void set_lock_for_tables(thr_lock_type lock_type)
{
  THD	*thd=current_thd;
  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));

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

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/*
** This is used for UNION to create a new table list of all used tables
** The table_list->table entry in all used tables are set to point
** to the entries in this list.
*/

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static bool create_total_list(THD *thd, LEX *lex,
			      TABLE_LIST **result, bool skip_first)
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{
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  /* Handle the case when we are not using union */
  if (!lex->select_lex.next)
  {
    *result= (TABLE_LIST*) lex->select_lex.table_list.first;
    return 0;
  }

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  /* We should skip first table if SQL command is SQLCOM_CREATE_TABLE */
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  SELECT_LEX *sl;
  TABLE_LIST **new_table_list= result, *aux;
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  *new_table_list=0;				// end result list
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  for (sl= &lex->select_lex; sl; sl=sl->next)
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  {
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    if (sl->order_list.first && sl->next && !sl->braces)
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    {
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      net_printf(&thd->net,ER_WRONG_USAGE,"UNION","ORDER BY");
      return 1;
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    }
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    if ((aux= (TABLE_LIST*) sl->table_list.first))
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    {
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      TABLE_LIST *next;
      for (; aux; aux=next)
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      {
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	TABLE_LIST *cursor= *result;
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	if (skip_first && cursor)
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	  cursor= cursor->next;
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	next= aux->next;
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	for ( ; cursor; cursor=cursor->next)
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	  if (!strcmp(cursor->db,aux->db) &&
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	      !strcmp(cursor->real_name,aux->real_name) &&
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	      !strcmp(cursor->alias, aux->alias))
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	    break;
	if (!cursor)
	{
	  /* Add not used table to the total table list */
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	  if (!(cursor = (TABLE_LIST *) thd->memdup((char*) aux,
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						    sizeof(*aux))))
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	  {
	    send_error(&thd->net,0);
	    return 1;
	  }
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	  *new_table_list= cursor;
	  new_table_list= &cursor->next;
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	  *new_table_list=0;			// end result list
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	}
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	else
	  aux->shared=1;			// Mark that it's used twice
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	aux->table= my_reinterpret_cast(TABLE *) (cursor);
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      }
    }
  }
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  return 0;
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}

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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;
}

	/* Check if name is used in table list */

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static bool check_dup(const char *db, const char *name, TABLE_LIST *tables)
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{
  for (; tables ; tables=tables->next)
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    if (!strcmp(name,tables->real_name) && !strcmp(db,tables->db))
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      return 1;
  return 0;
}

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/*
  Reload/resets privileges and the different caches
*/

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bool reload_acl_and_cache(THD *thd, ulong options, TABLE_LIST *tables)
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{
  bool result=0;
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  bool error_already_sent=0;
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  select_errors=0;				/* Write if more errors */
  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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  }
  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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    mysql_log.new_file(1);
    mysql_update_log.new_file(1);
    mysql_bin_log.new_file(1);
    mysql_slow_log.new_file(1);
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    LOCK_ACTIVE_MI;
    rotate_relay_log(active_mi);
    UNLOCK_ACTIVE_MI;

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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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  if (options & (REFRESH_TABLES | REFRESH_READ_LOCK))
  {
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    if ((options & REFRESH_READ_LOCK) && thd)
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    {
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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();
  if (options & REFRESH_MASTER)
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    if (reset_master(thd))
      result=1;
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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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 if (options & REFRESH_SLAVE)
 {
   LOCK_ACTIVE_MI;
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   if (reset_slave(thd, active_mi))
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   {
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     result=1;
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     /*
       reset_slave() sends error itself.
       If it didn't, one would either change reset_slave()'s prototype, to
       pass *errorcode and *errmsg to it when it's called or
       change reset_slave to use my_error() to register the error.
     */
     error_already_sent=1;
   }
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   UNLOCK_ACTIVE_MI;
 }
 if (options & REFRESH_USER_RESOURCES)
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   reset_mqh(thd,(LEX_USER *) NULL);
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 if (thd && !error_already_sent)
 {
   if (result)
     send_error(&thd->net,0);
   else
     send_ok(&thd->net);
 }

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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
*/

3722
void kill_one_thread(THD *thd, ulong id)
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{
  THD *tmp;
  uint error=ER_NO_SUCH_THREAD;
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  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For unlink from list
  I_List_iterator<THD> it(threads);
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  while ((tmp=it++))
  {
    if (tmp->thread_id == id)
    {
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      pthread_mutex_lock(&tmp->LOCK_delete);	// Lock from delete
      break;
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    }
  }
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
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  if (tmp)
  {
    if ((thd->master_access & SUPER_ACL) ||
	!strcmp(thd->user,tmp->user))
    {
      tmp->awake(1 /*prepare to die*/);
      error=0;
    }
    else
      error=ER_KILL_DENIED_ERROR;
    pthread_mutex_unlock(&tmp->LOCK_delete);
  }

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  if (!error)
    send_ok(&thd->net);
  else
    net_printf(&thd->net,error,id);
}

/* Clear most status variables */

static void refresh_status(void)
{
  pthread_mutex_lock(&THR_LOCK_keycache);
  pthread_mutex_lock(&LOCK_status);
  for (struct show_var_st *ptr=status_vars; ptr->name; ptr++)
  {
    if (ptr->type == SHOW_LONG)
      *(ulong*) ptr->value=0;
  }
  pthread_mutex_unlock(&LOCK_status);
  pthread_mutex_unlock(&THR_LOCK_keycache);
}
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	/* If pointer is not a null pointer, append filename to it */

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static bool append_file_to_dir(THD *thd, char **filename_ptr, char *table_name)
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{
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  char buff[FN_REFLEN],*ptr, *end;
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  if (!*filename_ptr)
    return 0;					// nothing to do

  /* Check that the filename is not too long and it's a hard path */
  if (strlen(*filename_ptr)+strlen(table_name) >= FN_REFLEN-1 ||
      !test_if_hard_path(*filename_ptr))
  {
    my_error(ER_WRONG_TABLE_NAME, MYF(0), *filename_ptr);
    return 1;
  }
  /* Fix is using unix filename format on dos */
  strmov(buff,*filename_ptr);
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  end=convert_dirname(buff, *filename_ptr, NullS);
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  if (!(ptr=thd->alloc((uint) (end-buff)+(uint) strlen(table_name)+1)))
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    return 1;					// End of memory
  *filename_ptr=ptr;
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  strxmov(ptr,buff,table_name,NullS);
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  return 0;
}
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/*
  Check if the select is a simple select (not an union)

  SYNOPSIS
    check_simple_select()

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

bool check_simple_select()
{
  THD *thd= current_thd;
  if (thd->lex.select != &thd->lex.select_lex)
  {
    char command[80];
    strmake(command, thd->lex.yylval->symbol.str,
	    min(thd->lex.yylval->symbol.length, sizeof(command)-1));
    net_printf(&thd->net, ER_CANT_USE_OPTION_HERE, command);
    return 1;
  }
  return 0;
}