sql_parse.cc 128 KB
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/* Copyright (C) 2000-2003 MySQL AB
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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

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

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

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#ifdef HAVE_OPENSSL
/*
  Without SSL the handshake consists of one packet. This packet
  has both client capabilites and scrambled password.
  With SSL the handshake might consist of two packets. If the first
  packet (client capabilities) has CLIENT_SSL flag set, we have to
  switch to SSL and read the second packet. The scrambled password
  is in the second packet and client_capabilites field will be ignored.
  Maybe it is better to accept flags other than CLIENT_SSL from the
  second packet?
*/
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#define SSL_HANDSHAKE_SIZE      2
#define NORMAL_HANDSHAKE_SIZE   6
#define MIN_HANDSHAKE_SIZE      2
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#else
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#define MIN_HANDSHAKE_SIZE      6
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#endif /* HAVE_OPENSSL */
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extern int yyparse(void *thd);
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extern "C" pthread_mutex_t THR_LOCK_keycache;
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#ifdef SOLARIS
extern "C" int gethostname(char *name, int namelen);
#endif
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static int check_for_max_user_connections(THD *thd, USER_CONN *uc);
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static void decrease_user_connections(USER_CONN *uc);
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static bool check_db_used(THD *thd,TABLE_LIST *tables);
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static bool check_merge_table_access(THD *thd, char *db, TABLE_LIST *tables);
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static void remove_escape(char *name);
static void refresh_status(void);
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static bool append_file_to_dir(THD *thd, char **filename_ptr,
			       char *table_name);
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static bool single_table_command_access(THD *thd, ulong privilege,
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					TABLE_LIST *tables, int *res);

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const char *any_db="*any*";	// Special symbol for check_access
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const char *command_name[]={
  "Sleep", "Quit", "Init DB", "Query", "Field List", "Create DB",
  "Drop DB", "Refresh", "Shutdown", "Statistics", "Processlist",
  "Connect","Kill","Debug","Ping","Time","Delayed_insert","Change user",
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  "Binlog Dump","Table Dump",  "Connect Out", "Register Slave",
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  "Prepare", "Prepare Execute", "Long Data", "Close stmt",
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  "Error"					// Last command number
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};

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

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

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


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static HASH hash_user_connections;
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(thd, 0, NullS);		// Out of memory
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      return_val=1;
      goto end;
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    }
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    uc->user=(char*) (uc+1);
    memcpy(uc->user,temp_user,temp_len+1);
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    uc->user_len= user_len;
    uc->host=uc->user + uc->user_len +  1;
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    uc->len = temp_len;
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    uc->connections = 1;
    uc->questions=uc->updates=uc->conn_per_hour=0;
    uc->user_resources=*mqh;
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    if (max_user_connections && mqh->connections > max_user_connections)
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      uc->user_resources.connections = max_user_connections;
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    uc->intime=thd->thr_create_time;
    if (hash_insert(&hash_user_connections, (byte*) uc))
    {
      my_free((char*) uc,0);
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      send_error(thd, 0, NullS);		// Out of memory
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      return_val=1;
      goto end;
    }
  }
  thd->user_connect=uc;
end:
  (void) pthread_mutex_unlock(&LOCK_user_conn);
  return return_val;
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}
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/*
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  Check if user is ok
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  SYNOPSIS
    check_user()
    thd			Thread handle
    command		Command for connection (for log)
    user		Name of user trying to connect
    passwd		Scrambled password sent from client
    db			Database to connect to
    check_count		If set to 1, don't allow too many connection
    simple_connect	If 1 then client is of old type and we should connect
			using the old method (no challange)
    do_send_error	Set to 1 if we should send error to user
    prepared_scramble	Buffer to store hash password of new connection
    had_password	Set to 1 if the user gave a password
    cur_priv_version	Check flag to know if someone flushed the privileges
			since last code
    hint_user	        Pointer used by acl_getroot() to remmeber user for
			next call

  RETURN
    0		ok
		thd->user, thd->master_access, thd->priv_user, thd->db and
		thd->db_access are updated
    1		Access denied;  Error sent to client
    -1		If do_send_error == 1:  Failed connect, error sent to client
		If do_send_error == 0:	Prepare for stage of connect
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*/

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static int check_user(THD *thd,enum_server_command command, const char *user,
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		       const char *passwd, const char *db, bool check_count,
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                       bool simple_connect, bool do_send_error, 
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                       char *prepared_scramble, bool had_password,
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                       uint *cur_priv_version, ACL_USER** hint_user)
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{
  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[SCRAMBLE41_LENGTH];
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  DBUG_ENTER("check_user");
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  /*
    Move password to temporary buffer as it may be stored in communication
    buffer
  */
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  strmake(tmp_passwd, passwd, sizeof(tmp_passwd));
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  passwd= tmp_passwd;				// Use local copy
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  /* We shall avoid dupplicate user allocations here */
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  if (!thd->user && !(thd->user = my_strdup(user, MYF(0))))
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  {
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    send_error(thd,ER_OUT_OF_RESOURCES);
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    DBUG_RETURN(1);
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  }
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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 &
				    CLIENT_LONG_PASSWORD)),
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				 &ur,prepared_scramble,
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				 cur_priv_version,hint_user);
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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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	      had_password ? "yes": "no",
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	      thd->master_access, thd->db ? thd->db : "*none*"));
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  /*
    In case we're going to retry we should not send error message at this
    point
  */
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  if (thd->master_access & NO_ACCESS)
  {
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    if (do_send_error || !had_password || !*hint_user)
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    {
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      DBUG_PRINT("info",("Access denied"));
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      /*
	Old client should get nicer error message if password version is
	not supported
      */
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      if (simple_connect && *hint_user && (*hint_user)->pversion)
      {
        net_printf(thd, ER_NOT_SUPPORTED_AUTH_MODE);
        mysql_log.write(thd,COM_CONNECT,ER(ER_NOT_SUPPORTED_AUTH_MODE));
      }
      else
      {
        net_printf(thd, ER_ACCESS_DENIED_ERROR,
      	         thd->user,
	         thd->host_or_ip,
	         had_password ? ER(ER_YES) : ER(ER_NO));
        mysql_log.write(thd,COM_CONNECT,ER(ER_ACCESS_DENIED_ERROR),
	              thd->user,
                      thd->host_or_ip,
	              had_password ? ER(ER_YES) : ER(ER_NO));
      }                
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      DBUG_RETURN(1);			// Error already given
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    }
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    DBUG_PRINT("info",("Prepare for second part of handshake"));
    DBUG_RETURN(-1);			// no report error in special handshake
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  }
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  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
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      send_error(thd, ER_CON_COUNT_ERROR);
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      DBUG_RETURN(1);
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    }
  }
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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) &&
      get_or_create_user_conn(thd,user,thd->host_or_ip,&ur))
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    DBUG_RETURN(1);
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  if (thd->user_connect && thd->user_connect->user_resources.connections &&
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      check_for_max_user_connections(thd, thd->user_connect))
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    DBUG_RETURN(1);
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  if (db && db[0])
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  {
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    int 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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    DBUG_RETURN(error);
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  }
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  send_ok(thd);					// Ready to handle questions
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  thd->password= test(passwd[0]);		// Remember for error messages
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  DBUG_RETURN(0);				// ok
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}

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

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

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

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


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static int check_for_max_user_connections(THD *thd, USER_CONN *uc)
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{
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  int error=0;
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  DBUG_ENTER("check_for_max_user_connections");
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  if (max_user_connections &&
      (max_user_connections <=  (uint) uc->connections))
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  {
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    net_printf(thd,ER_TOO_MANY_USER_CONNECTIONS, uc->user);
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    error=1;
    goto end;
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  }
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  uc->connections++;
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  if (uc->user_resources.connections &&
      uc->conn_per_hour++ >= uc->user_resources.connections)
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  {
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    net_printf(thd, ER_USER_LIMIT_REACHED, uc->user,
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	       "max_connections",
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	       (long) uc->user_resources.connections);
    error=1;
  }
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end:
  DBUG_RETURN(error);
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}


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

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

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

char  uc_update_queries[SQLCOM_END];

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

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

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

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

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

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    memcpy(temp_user,lu->user.str,lu->user.length);
    memcpy(temp_user+lu->user.length+1,lu->host.str,lu->host.length);
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    temp_user[lu->user.length]='\0'; temp_user[temp_len-1]=0;
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    if ((uc = (struct  user_conn *) hash_search(&hash_user_connections,
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						(byte*) temp_user, temp_len)))
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    {
      uc->questions=0;
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      get_mqh(temp_user,&temp_user[lu->user.length+1],uc);
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      uc->updates=0;
      uc->conn_per_hour=0;
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    }
  }
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  else // for FLUSH PRIVILEGES and FLUSH USER_RESOURCES
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  {
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    for (uint idx=0;idx < hash_user_connections.records; idx++)
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    {
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      USER_CONN *uc=(struct user_conn *) hash_element(&hash_user_connections, idx);
      if (get_them)
	get_mqh(uc->user,uc->host,uc);
      uc->questions=0;
      uc->updates=0;
      uc->conn_per_hour=0;
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    }
  }
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  (void) pthread_mutex_unlock(&LOCK_user_conn);
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}
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/*
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  Check connnectionn and get priviliges

  SYNOPSIS
    check_connections
    thd		Thread handle

  RETURN
    0	ok
    -1	Error, which is sent to user
    > 0	 Error code (not sent to user)
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*/

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#ifndef EMBEDDED_LIBRARY  
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static int
check_connections(THD *thd)
{
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  int res;
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  uint connect_errors=0;
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  uint cur_priv_version;
  bool using_password;
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  NET *net= &thd->net;
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  char *end, *user, *passwd, *db;
  char prepared_scramble[SCRAMBLE41_LENGTH+4];  /* Buffer for scramble&hash */
  ACL_USER* cached_user=NULL; /* Initialise to NULL for first stage */
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  String convdb;
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  DBUG_PRINT("info",("New connection received on %s",
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		     vio_description(net->vio)));
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  /* Remove warning from valgrind.  TODO:  Fix it in password.c */
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  bzero((char*) &prepared_scramble[0], sizeof(prepared_scramble));
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  if (!thd->host)                           // If TCP/IP connection
  {
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    char ip[30];
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    if (vio_peer_addr(net->vio, ip, &thd->peer_port))
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      return (ER_BAD_HOST_ERROR);
    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;
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    else
#endif
    {
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      if (!(specialflag & SPECIAL_NO_RESOLVE))
      {
	vio_in_addr(net->vio,&thd->remote.sin_addr);
	thd->host=ip_to_hostname(&thd->remote.sin_addr,&connect_errors);
	/* Cut very long hostnames to avoid possible overflows */
	if (thd->host)
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	{
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	  thd->host[min(strlen(thd->host), HOSTNAME_LENGTH)]= 0;
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	  thd->host_or_ip= thd->host;
	}
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	if (connect_errors > max_connect_errors)
	  return(ER_HOST_IS_BLOCKED);
      }
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    }
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    DBUG_PRINT("info",("Host: %s  ip: %s",
		       thd->host ? thd->host : "unknown host",
		       thd->ip ? thd->ip : "unknown ip"));
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    if (acl_check_host(thd->host,thd->ip))
      return(ER_HOST_NOT_PRIVILEGED);
  }
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  else /* Hostname given means that the connection was on a socket */
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  {
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    DBUG_PRINT("info",("Host: %s",thd->host));
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    thd->host_or_ip= thd->host;
    thd->ip= 0;
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    bzero((char*) &thd->remote,sizeof(struct sockaddr));
  }
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  /* Ensure that wrong hostnames doesn't cause buffer overflows */
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  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 */
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    char buff[SERVER_VERSION_LENGTH + SCRAMBLE_LENGTH+64];
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    ulong client_flags = (CLIENT_LONG_FLAG | CLIENT_CONNECT_WITH_DB |
			  CLIENT_PROTOCOL_41 | CLIENT_SECURE_CONNECTION);
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    if (opt_using_transactions)
      client_flags|=CLIENT_TRANSACTIONS;
#ifdef HAVE_COMPRESS
    client_flags |= CLIENT_COMPRESS;
#endif /* HAVE_COMPRESS */
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#ifdef HAVE_OPENSSL
    if (ssl_acceptor_fd)
      client_flags |= CLIENT_SSL;       /* Wow, SSL is avalaible! */
#endif /* HAVE_OPENSSL */
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    end=strnmov(buff,server_version,SERVER_VERSION_LENGTH)+1;
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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) default_charset_info->number;
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    int2store(end+3,thd->server_status);
    bzero(end+5,13);
    end+=18;
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    // At this point we write connection message and read reply
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    if (net_write_command(net,(uchar) protocol_version, "", 0, buff,
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			  (uint) (end-buff)) ||
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	(pkt_len= my_net_read(net)) == packet_error ||
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	pkt_len < MIN_HANDSHAKE_SIZE)
    {
      inc_host_errors(&thd->remote.sin_addr);
      return(ER_HANDSHAKE_ERROR);
    }
  }
#ifdef _CUSTOMCONFIG_
#include "_cust_sql_parse.h"
#endif
  if (connect_errors)
    reset_host_errors(&thd->remote.sin_addr);
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  if (thd->packet.alloc(thd->variables.net_buffer_length))
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    return(ER_OUT_OF_RESOURCES);

  thd->client_capabilities=uint2korr(net->read_pos);
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#ifdef TO_BE_REMOVED_IN_4_1_RELEASE
  /*
    This is just a safety check against any client that would use the old
    CLIENT_CHANGE_USER flag
  */
  if ((thd->client_capabilities & CLIENT_PROTOCOL_41) &&
      !(thd->client_capabilities & (CLIENT_RESERVED |
				    CLIENT_SECURE_CONNECTION |
				    CLIENT_MULTI_RESULTS)))
    thd->client_capabilities&= ~CLIENT_PROTOCOL_41;
#endif
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  if (thd->client_capabilities & CLIENT_PROTOCOL_41)
  {
    thd->client_capabilities|= ((ulong) uint2korr(net->read_pos+2)) << 16;
    thd->max_client_packet_length= uint4korr(net->read_pos+4);
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    if (!(thd->variables.character_set_client=
	  get_charset((uint) net->read_pos[8], MYF(0))))
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    {
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      thd->variables.character_set_client=
	global_system_variables.character_set_client;
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      thd->variables.collation_connection=
	global_system_variables.collation_connection;
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      thd->variables.character_set_results=
	global_system_variables.character_set_results;
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    }
    else
    {
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      thd->variables.character_set_results=
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      thd->variables.collation_connection= 
	thd->variables.character_set_client;
    }
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    end= (char*) net->read_pos+32;
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  }
  else
  {
    thd->max_client_packet_length= uint3korr(net->read_pos+2);
    end= (char*) net->read_pos+5;
  }

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

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

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  user=   end;
  passwd= strend(user)+1;
  db=0;
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  using_password= test(passwd[0]);
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  if (thd->client_capabilities & CLIENT_CONNECT_WITH_DB)
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  {
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    db=strend(passwd)+1;
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    convdb.copy(db, strlen(db), 
		thd->variables.character_set_client, system_charset_info);
    db= convdb.c_ptr();
  }
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  /* We can get only old hash at this point */
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  if (using_password && strlen(passwd) != SCRAMBLE_LENGTH)
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    return ER_HANDSHAKE_ERROR;
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  if (thd->client_capabilities & CLIENT_INTERACTIVE)
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    thd->variables.net_wait_timeout= thd->variables.net_interactive_timeout;
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  if ((thd->client_capabilities & CLIENT_TRANSACTIONS) &&
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      opt_using_transactions)
    net->return_status= &thd->server_status;
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  net->read_timeout=(uint) thd->variables.net_read_timeout;
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  /* Simple connect only for old clients. New clients always use secure auth */
  bool simple_connect=(!(thd->client_capabilities & CLIENT_SECURE_CONNECTION));
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  /* Check user permissions. If password failure we'll get scramble back */
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  if ((res=check_user(thd, COM_CONNECT, user, passwd, db, 1, simple_connect,
		      simple_connect, prepared_scramble, using_password,
		      &cur_priv_version,
		      &cached_user)) < 0)
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  {
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    /* Store current used and database as they are erased with next packet */
    char tmp_user[USERNAME_LENGTH+1];
    char tmp_db[NAME_LEN+1];

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    /* If the client is old we just have to return error */
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    if (simple_connect)
      return -1;

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    DBUG_PRINT("info",("password challenge"));

    tmp_user[0]= tmp_db[0]= 0;
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    if (user)
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      strmake(tmp_user,user,USERNAME_LENGTH);
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    if (db)
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      strmake(tmp_db,db,NAME_LEN);

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    /* Write hash and encrypted scramble to client */
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    if (my_net_write(net,prepared_scramble,SCRAMBLE41_LENGTH+4) ||
        net_flush(net))
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    {
      inc_host_errors(&thd->remote.sin_addr);
      return ER_HANDSHAKE_ERROR;
    }
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    /* Reading packet back */
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    if ((pkt_len= my_net_read(net)) == packet_error)
    {
      inc_host_errors(&thd->remote.sin_addr);
      return ER_HANDSHAKE_ERROR;
    }
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    /* We have to get very specific packet size  */
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    if (pkt_len != SCRAMBLE41_LENGTH)
    {
      inc_host_errors(&thd->remote.sin_addr);
      return ER_HANDSHAKE_ERROR;
    }
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    /* Final attempt to check the user based on reply */
    if (check_user(thd,COM_CONNECT, tmp_user, (char*)net->read_pos,
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		   tmp_db, 1, 0, 1, prepared_scramble, using_password,
		   &cur_priv_version,
		   &cached_user))
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      return -1;
  }
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  else if (res)
    return -1;					// Error sent from check_user()
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  return 0;
}

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

  pthread_detach_this_thread();

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

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

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

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

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

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

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

  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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  thd->init_for_queries();
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  while (fgets(buff, thd->net.max_packet, file))
  {
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    uint length=(uint) strlen(buff);
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    while (length && (my_isspace(thd->charset(), buff[length-1]) ||
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           buff[length-1] == ';'))
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      length--;
    buff[length]=0;
    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
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    if (thd->is_fatal_error)
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      break;
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    free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
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    free_root(&thd->transaction.mem_root,MYF(MY_KEEP_PREALLOC));
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  }
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  /* thd->fatal_error should be set in case something went wrong */
end:
  (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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#endif /* EMBEDDED_LIBRARY */

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

int mysql_table_dump(THD* thd, char* db, char* tbl_name, int fd)
{
  TABLE* table;
  TABLE_LIST* table_list;
  int error = 0;
  DBUG_ENTER("mysql_table_dump");
  db = (db && db[0]) ? db : thd->db;
1010
  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;
1013
  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;

1017 1018
  if (!db || check_db_name(db))
  {
1019
    net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
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    goto err;
  }
1022
  if (lower_case_table_names)
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    my_casedn_str(files_charset_info, tbl_name);
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  remove_escape(table_list->real_name);
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  if (!(table=open_ltable(thd, table_list, TL_READ_NO_INSERT)))
    DBUG_RETURN(1);

1029
  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)))
  {
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    my_error(ER_GET_ERRNO, MYF(0), my_errno);
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    goto err;
  }
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  net_flush(&thd->net);
1043
  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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}


1052
	/* Execute one command from socket (query or simple command) */
1053 1054

#ifndef EMBEDDED_LIBRARY
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bool do_command(THD *thd)
{
  char *packet;
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  uint old_timeout;
  ulong packet_length;
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  NET *net;
  enum enum_server_command command;
  DBUG_ENTER("do_command");

  net= &thd->net;
  thd->current_tablenr=0;
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  /*
    indicator of uninitialized lex => normal flow of errors handling
    (see my_message_sql)
  */
  thd->lex.current_select= 0;
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  packet=0;
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  old_timeout=net->read_timeout;
  // Wait max for 8 hours
  net->read_timeout=(uint) thd->variables.net_wait_timeout;
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  thd->clear_error();				// Clear error message
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  net_new_transaction(net);
  if ((packet_length=my_net_read(net)) == packet_error)
  {
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    DBUG_PRINT("info",("Got error %d reading command from socket %s",
		       net->error,
		       vio_description(net->vio)));
    /* Check if we can continue without closing the connection */
    if (net->error != 3)
1086 1087
    {
      statistic_increment(aborted_threads,&LOCK_status);
1088
      DBUG_RETURN(TRUE);			// We have to close it.
1089
    }
1090
    send_error(thd,net->last_errno,NullS);
1091
    net->error= 0;
1092
    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));
1106
}
1107
#endif  /* EMBEDDED_LIBRARY */
1108

1109

1110 1111 1112 1113
bool dispatch_command(enum enum_server_command command, THD *thd,
		      char* packet, uint packet_length)
{
  NET *net= &thd->net;
1114
  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
1132
  switch (command) {
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  case COM_INIT_DB:
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    {
      String convname;
      statistic_increment(com_stat[SQLCOM_CHANGE_DB],&LOCK_status);
      convname.copy(packet, strlen(packet),
		    thd->variables.character_set_client, system_charset_info);
      if (!mysql_change_db(thd,convname.c_ptr()))
	mysql_log.write(thd,command,"%s",thd->db);
      break;
    }
1143
#ifndef EMBEDDED_LIBRARY
1144 1145
  case COM_REGISTER_SLAVE:
  {
1146
    if (!register_slave(thd, (uchar*)packet, packet_length))
1147
      send_ok(thd);
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    break;
  }
1150
#endif
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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);
1158
      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); // dump to NET
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      break;
    }
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#ifndef EMBEDDED_LIBRARY
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  case COM_CHANGE_USER:
  {
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    thd->change_user();
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    thd->clear_error();			// If errors from rollback
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    statistic_increment(com_other,&LOCK_status);
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    char *user=   (char*) packet;
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    char *passwd= strend(user)+1;
    char *db=     strend(passwd)+1;
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    /* 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;
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    thd->user=NULL; /* Needed for check_user to allocate new user */
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    char *save_priv_user=   thd->priv_user;
    char *save_db=	    thd->db;
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    USER_CONN *save_uc=     thd->user_connect;
    bool simple_connect;
    bool using_password;
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    char prepared_scramble[SCRAMBLE41_LENGTH+4];/* Buffer for scramble,hash */
    char tmp_user[USERNAME_LENGTH+1];
    char tmp_db[NAME_LEN+1];
    ACL_USER* cached_user     ;                 /* Cached user */
    uint cur_priv_version;                      /* Cached grant version */
1194 1195
    int res;
    ulong pkt_len= 0;				/* Length of reply packet */
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    bzero((char*) prepared_scramble, sizeof(prepared_scramble));
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    /* Small check for incomming packet */
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    if ((uint) ((uchar*) db - net->read_pos) > packet_length)
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      goto restore_user_err;
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    /* Now we shall basically perform authentication again */
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     /* We can get only old hash at this point */
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    if (passwd[0] && strlen(passwd)!=SCRAMBLE_LENGTH)
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      goto restore_user_err;
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    cached_user= NULL;
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    /* Simple connect only for old clients. New clients always use sec. auth*/
    simple_connect=(!(thd->client_capabilities & CLIENT_SECURE_CONNECTION));
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    /* Store information if we used password. passwd will be dammaged */
    using_password=test(passwd[0]);
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    if (simple_connect) /* Restore scramble for old clients */
      memcpy(thd->scramble,thd->old_scramble,9);

    /*
1221 1222
      Check user permissions. If password failure we'll get scramble back
      Do not retry if we already have sent error (result>0)
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    */
1224 1225 1226
    if ((res=check_user(thd,COM_CHANGE_USER, user, passwd, db, 0,
			simple_connect, simple_connect, prepared_scramble,
			using_password, &cur_priv_version, &cached_user)) < 0)
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    {
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      /* If the client is old we just have to have auth failure */
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      if (simple_connect)
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        goto restore_user;			/* Error is already reported */
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      /* Store current used and database as they are erased with next packet */
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      tmp_user[0]= tmp_db[0]= 0;
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      if (user)
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        strmake(tmp_user,user,USERNAME_LENGTH);
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      if (db)
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        strmake(tmp_db,db,NAME_LEN);

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      /* Write hash and encrypted scramble to client */
1240 1241
      if (my_net_write(net,prepared_scramble,SCRAMBLE41_LENGTH+4) ||
          net_flush(net))
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        goto restore_user_err;
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      /* Reading packet back */
      if ((pkt_len=my_net_read(net)) == packet_error)
        goto restore_user_err;

      /* We have to get very specific packet size  */
1249
      if (pkt_len != SCRAMBLE41_LENGTH)
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        goto restore_user;
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      /* Final attempt to check the user based on reply */
1253
      if (check_user(thd,COM_CHANGE_USER, tmp_user, (char*) net->read_pos,
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		     tmp_db, 0, 0, 1, prepared_scramble, using_password,
		     &cur_priv_version, &cached_user))
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        goto restore_user;
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    }
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    else if (res)
      goto restore_user;

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    /* Finally we've authenticated new user */
1262
    if (max_connections && save_uc)
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      decrease_user_connections(save_uc);
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    x_free((gptr) save_db);
    x_free((gptr) save_user);
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    thd->password=using_password;
    break;
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    /* Bad luck  we shall restore old user */
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restore_user_err:
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    send_error(thd, ER_UNKNOWN_COM_ERROR);
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1273
restore_user:
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    x_free(thd->user);
    thd->master_access=save_master_access;
    thd->db_access=save_db_access;
    thd->db=save_db;
    thd->db_length=save_db_length;
    thd->user=save_user;
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    thd->priv_user=save_priv_user;
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    break;
  }
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#endif /* EMBEDDED_LIBRARY */
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  case COM_EXECUTE:
  {
1286
    mysql_stmt_execute(thd, packet);
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    break;
  }
  case COM_LONG_DATA:
  {
1291
    mysql_stmt_get_longdata(thd, packet, packet_length);
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    break;
  }
  case COM_PREPARE:
  {
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    mysql_stmt_prepare(thd, packet, packet_length);
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    break;
  }
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  case COM_CLOSE_STMT:
  {
    mysql_stmt_free(thd, packet);
    break;
  }
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  case COM_RESET_STMT:
  {
    mysql_stmt_reset(thd, packet);
    break;
  }
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  case COM_QUERY:
  {
1311 1312
    if (alloc_query(thd, packet, packet_length))
      break;					// fatal error is set
1313
    mysql_log.write(thd,command,"%s",thd->query);
1314
    DBUG_PRINT("query",("%-.4096s",thd->query));
1315
    mysql_parse(thd,thd->query, thd->query_length);
1316

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    while (!thd->killed && !thd->is_fatal_error && thd->lex.found_colon)
1318
    {
1319
      char *packet= thd->lex.found_colon;
1320 1321 1322 1323 1324 1325
      /* 
        Multiple queries exits, execute them individually
      */
      if (thd->lock || thd->open_tables || thd->derived_tables)
        close_thread_tables(thd);		

1326
      ulong length= thd->query_length-(ulong)(thd->lex.found_colon-thd->query);
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      /* Remove garbage at start of query */
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      while (my_isspace(thd->charset(), *packet) && length > 0)
1330 1331 1332 1333 1334
      {
        packet++;
        length--;
      }
      thd->query_length= length;
1335 1336 1337 1338
      thd->query= packet;
      VOID(pthread_mutex_lock(&LOCK_thread_count));
      thd->query_id= query_id++;
      VOID(pthread_mutex_unlock(&LOCK_thread_count));
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      mysql_parse(thd, packet, length);
    }

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    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),WAIT_PRIOR);
    DBUG_PRINT("info",("query ready"));
    break;
  }
1347
  case COM_FIELD_LIST:				// This isn't actually needed
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#ifdef DONT_ALLOW_SHOW_COMMANDS
1349
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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    break;
#else
  {
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    char *fields, *pend;
    String convname;
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    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))
    {
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      send_error(thd,ER_NO_DB_ERROR);
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      break;
    }
    thd->free_list=0;
1364 1365 1366 1367 1368
    pend= strend(packet);
    convname.copy(packet, pend-packet, 
		  thd->variables.character_set_client, system_charset_info);
    table_list.alias= table_list.real_name= convname.c_ptr();
    packet= pend+1;
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    // command not cachable => no gap for data base name
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    if (!(thd->query=fields=thd->memdup(packet,thd->query_length+1)))
      break;
1372
    mysql_log.write(thd,command,"%s %s",table_list.real_name,fields);
1373
    if (lower_case_table_names)
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      my_casedn_str(files_charset_info, table_list.real_name);
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    remove_escape(table_list.real_name);	// This can't have wildcards

    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);
1383
    free_items(thd->free_list);
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    break;
  }
#endif
  case COM_QUIT:
1388
    /* We don't calculate statistics for this command */
1389
    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);
1397
      char *db=thd->strdup(packet);
1398
      // null test to handle EOM
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      if (!db || !strip_sp(db) || check_db_name(db))
1400
      {
1401
	net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
1402 1403
	break;
      }
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      if (check_access(thd,CREATE_ACL,db,0,1))
	break;
1406
      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);
1413
      char *db=thd->strdup(packet);
1414
      // null test to handle EOM
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      if (!db || !strip_sp(db) || check_db_name(db))
1416
      {
1417
	net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
1418 1419
	break;
      }
1420 1421
      if (check_access(thd,DROP_ACL,db,0,1))
	break;
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      if (thd->locked_tables || thd->active_transaction())
      {
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	send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
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	break;
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      }
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      mysql_log.write(thd,command,db);
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      mysql_rm_db(thd,db,0,0);
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      break;
    }
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#ifndef EMBEDDED_LIBRARY
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  case COM_BINLOG_DUMP:
    {
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      statistic_increment(com_other,&LOCK_status);
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      slow_command = TRUE;
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      if (check_global_access(thd, REPL_SLAVE_ACL))
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	break;
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      mysql_log.write(thd,command, 0);
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      ulong pos;
      ushort flags;
1442
      uint32 slave_server_id;
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      /* TODO: The following has to be changed to an 8 byte integer */
1444 1445
      pos = uint4korr(packet);
      flags = uint2korr(packet + 4);
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      thd->server_id=0; /* avoid suicide */
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      kill_zombie_dump_threads(slave_server_id = uint4korr(packet+6));
1448
      thd->server_id = slave_server_id;
1449
      mysql_binlog_send(thd, thd->strdup(packet + 10), (my_off_t) pos, flags);
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      unregister_slave(thd,1,1);
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      // fake COM_QUIT -- if we get here, the thread needs to terminate
      error = TRUE;
      net->error = 0;
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      break;
    }
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#endif
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  case COM_REFRESH:
    {
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      statistic_increment(com_stat[SQLCOM_FLUSH],&LOCK_status);
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      ulong options= (ulong) (uchar) packet[0];
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      if (check_global_access(thd,RELOAD_ACL))
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	break;
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      mysql_log.write(thd,command,NullS);
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      if (reload_acl_and_cache(thd, options, (TABLE_LIST*) 0, NULL))
        send_error(thd, 0);
      else
        send_ok(thd);
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      break;
    }
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#ifndef EMBEDDED_LIBRARY
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  case COM_SHUTDOWN:
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    statistic_increment(com_other,&LOCK_status);
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    if (check_global_access(thd,SHUTDOWN_ACL))
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      break; /* purecov: inspected */
    DBUG_PRINT("quit",("Got shutdown command"));
1476
    mysql_log.write(thd,command,NullS);
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    send_eof(thd);
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#ifdef __WIN__
    sleep(1);					// must wait after eof()
#endif
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#ifndef OS2
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    send_eof(thd);				// This is for 'quit request'
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#endif
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    close_connection(thd, 0, 1);
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    close_thread_tables(thd);			// Free before kill
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    free_root(&thd->mem_root,MYF(0));
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    free_root(&thd->transaction.mem_root,MYF(0));
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    kill_mysql();
    error=TRUE;
    break;
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#endif
#ifndef EMBEDDED_LIBRARY
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  case COM_STATISTICS:
  {
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    mysql_log.write(thd,command,NullS);
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    statistic_increment(com_stat[SQLCOM_SHOW_STATUS],&LOCK_status);
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    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
    if (lCurMemory)				// Using SAFEMALLOC
      sprintf(strend(buff), "  Memory in use: %ldK  Max memory used: %ldK",
	      (lCurMemory+1023L)/1024L,(lMaxMemory+1023L)/1024L);
 #endif
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    VOID(my_net_write(net, buff,(uint) strlen(buff)));
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    VOID(net_flush(net));
    break;
  }
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#endif
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  case COM_PING:
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    statistic_increment(com_other,&LOCK_status);
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    send_ok(thd);				// Tell client we are alive
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    break;
  case COM_PROCESS_INFO:
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    statistic_increment(com_stat[SQLCOM_SHOW_PROCESSLIST],&LOCK_status);
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    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(thd);
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    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:
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    send_error(thd, ER_UNKNOWN_COM_ERROR);
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    break;
  }
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  if (thd->lock || thd->open_tables || thd->derived_tables)
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  {
    thd->proc_info="closing tables";
    close_thread_tables(thd);			/* Free tables */
  }

1557
  if (thd->is_fatal_error)
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    send_error(thd,0);				// End of memory ?
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  time_t start_of_query=thd->start_time;
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  thd->end_time();				// Set start time
1562

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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);
}

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

  DESCRIPTION
    Sets the following THD variables:
      query
      query_length

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

bool alloc_query(THD *thd, char *packet, ulong packet_length)
{
  packet_length--;				// Remove end null
1608
  /* Remove garbage at start and end of query */
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  while (my_isspace(thd->charset(),packet[0]) && packet_length > 0)
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  {
    packet++;
    packet_length--;
  }
  char *pos=packet+packet_length;		// Point at end null
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  while (packet_length > 0 &&
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	 (pos[-1] == ';' || my_isspace(thd->charset() ,pos[-1])))
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  {
    pos--;
    packet_length--;
  }
  /* We must allocate some extra memory for query cache */
  if (!(thd->query= (char*) thd->memdup_w_gap((gptr) (packet),
					      packet_length,
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					      thd->db_length+2+
					      sizeof(ha_rows))))
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    return 1;
  thd->query[packet_length]=0;
  thd->query_length= packet_length;
  thd->packet.shrink(thd->variables.net_buffer_length);// Reclaim some memory

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

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

void
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mysql_execute_command(THD *thd)
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{
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  int	res= 0;
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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_lex;
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  SELECT_LEX_UNIT *unit= &lex->unit;
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  DBUG_ENTER("mysql_execute_command");

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  /*
    Reset warning count for each query that uses tables
    A better approach would be to reset this for any commands
    that is not a SHOW command or a select that only access local
    variables, but for now this is probably good enough.
  */
1657
  if (tables || &lex->select_lex != lex->all_selects_list)
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    mysql_reset_errors(thd);
  /*
    Save old warning count to be able to send to client how many warnings we
    got
  */
  thd->old_total_warn_count= thd->total_warn_count;

1665
#ifndef EMBEDDED_LIBRARY
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  if (thd->slave_thread)
  {
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    /*
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      Skip if we are in the slave thread, some table rules have been
      given and the table list says the query should not be replicated
    */
    if (table_rules_on && tables && !tables_ok(thd,tables))
1673
      DBUG_VOID_RETURN;
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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
1686
  }
1687
#endif /* EMBEDDED_LIBRARY */
1688
  /*
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    TODO: make derived tables processing 'inside' SELECT processing.
    TODO: solve problem with depended derived tables in subselects
1691
  */
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  if (lex->derived_tables)
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  {
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    for (SELECT_LEX *sl= lex->all_selects_list;
	 sl;
	 sl= sl->next_select_in_list())
1697
    {
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      for (TABLE_LIST *cursor= sl->get_table_list();
	   cursor;
	   cursor= cursor->next)
1701
      {
1702 1703 1704
	if (cursor->derived && (res=mysql_derived(thd, lex,
						  cursor->derived,
						  cursor)))
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	{
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	  if (res < 0 || thd->net.report_error)
	    send_error(thd,thd->killed ? ER_SERVER_SHUTDOWN : 0);
	  DBUG_VOID_RETURN;
	}
1710 1711
      }
    }
1712
  }
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  if ((&lex->select_lex != lex->all_selects_list &&
1714
       lex->unit.create_total_list(thd, lex, &tables, 0)) 
1715
#ifdef HAVE_REPLICATION
1716
      ||
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      (table_rules_on && tables && thd->slave_thread &&
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       !tables_ok(thd,tables))
#endif
      )
1721
    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))
  {
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    send_error(thd, ER_CANT_UPDATE_WITH_READLOCK);
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    DBUG_VOID_RETURN;
  }
1734

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  statistic_increment(com_stat[lex->sql_command],&LOCK_status);
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  switch (lex->sql_command) {
  case SQLCOM_SELECT:
  {
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    select_result *result=lex->result;
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    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
    }

1756 1757 1758
    unit->offset_limit_cnt= (ha_rows) unit->global_parameters->offset_limit;
    unit->select_limit_cnt= (ha_rows) (unit->global_parameters->select_limit+
      unit->global_parameters->offset_limit);
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    if (unit->select_limit_cnt <
1760
	(ha_rows) unit->global_parameters->select_limit)
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      unit->select_limit_cnt= HA_POS_ERROR;		// no limit
    if (unit->select_limit_cnt == HA_POS_ERROR)
1763
      select_lex->options&= ~OPTION_FOUND_ROWS;
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    if (!(res=open_and_lock_tables(thd,tables)))
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    {
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      if (lex->describe)
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      {
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	if (!(result= new select_send()))
	{
	  send_error(thd, ER_OUT_OF_RESOURCES);
	  DBUG_VOID_RETURN;
	}
	else
	  thd->send_explain_fields(result);
1776
	fix_tables_pointers(lex->all_selects_list);
1777
	res= mysql_explain_union(thd, &thd->lex.unit, result);
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	MYSQL_LOCK *save_lock= thd->lock;
	thd->lock= (MYSQL_LOCK *)0;
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	result->send_eof();
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	thd->lock= save_lock;
      }
      else
      {
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	if (!result)
	{
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	  if (!(result=new select_send()))
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	  {
	    res= -1;
#ifdef DELETE_ITEMS
	    delete select_lex->having;
	    delete select_lex->where;
#endif
	    break;
	  }
	}
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	query_cache_store_query(thd, tables);
	res=handle_select(thd, lex, result);
      }
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    }
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    break;
  }
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  case SQLCOM_DO:
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    if (tables && ((res= check_table_access(thd, SELECT_ACL, tables)) ||
		   (res= open_and_lock_tables(thd,tables))))
	break;

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

1814
  case SQLCOM_EMPTY_QUERY:
1815
    send_ok(thd);
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    break;

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

1822
#ifndef EMBEDDED_LIBRARY
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  case SQLCOM_PURGE:
1824
  {
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    if (check_global_access(thd, SUPER_ACL))
1826
      goto error;
1827
    // PURGE MASTER LOGS TO 'file'
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    res = purge_master_logs(thd, lex->to_log);
    break;
  }
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  case SQLCOM_PURGE_BEFORE:
  {
    if (check_global_access(thd, SUPER_ACL))
      goto error;
    // PURGE MASTER LOGS BEFORE 'data'
    res = purge_master_logs_before_date(thd, lex->purge_time);
    break;
  }
1839 1840
#endif

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  case SQLCOM_SHOW_WARNS:
  {
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    res= mysqld_show_warnings(thd, (ulong)
			      ((1L << (uint) MYSQL_ERROR::WARN_LEVEL_NOTE) |
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			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_WARN) |
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR)
			       ));
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    break;
  }
  case SQLCOM_SHOW_ERRORS:
  {
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    res= mysqld_show_warnings(thd, (ulong)
			      (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR));
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    break;
  }
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  case SQLCOM_SHOW_NEW_MASTER:
  {
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    if (check_global_access(thd, REPL_SLAVE_ACL))
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      goto error;
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#ifndef WORKING_NEW_MASTER
1861
    net_printf(thd, ER_NOT_SUPPORTED_YET, "SHOW NEW MASTER");
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    res= 1;
#else
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    res = show_new_master(thd);
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#endif
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    break;
  }
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#ifndef EMBEDDED_LIBRARY
1870 1871
  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;
  }
1884 1885
#endif

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  case SQLCOM_BACKUP_TABLE:
1887 1888 1889
  {
    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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1894 1895
    break;
  }
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  case SQLCOM_RESTORE_TABLE:
1897 1898
  {
    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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  case SQLCOM_PRELOAD_KEYS:
  {
    if (check_db_used(thd, tables) ||
        check_access(thd, INDEX_ACL, tables->db, &tables->grant.privilege))
      goto error; 
    res = mysql_preload_keys(thd, tables);
    break;
  }
      
1914 1915

#ifndef EMBEDDED_LIBRARY
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  case SQLCOM_CHANGE_MASTER:
1917
  {
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    if (check_global_access(thd, SUPER_ACL))
1919
      goto error;
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    LOCK_ACTIVE_MI;
    res = change_master(thd,active_mi);
    UNLOCK_ACTIVE_MI;
1923 1924
    break;
  }
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  case SQLCOM_SHOW_SLAVE_STAT:
1926
  {
1927 1928
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
1929
      goto error;
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    LOCK_ACTIVE_MI;
    res = show_master_info(thd,active_mi);
    UNLOCK_ACTIVE_MI;
1933 1934
    break;
  }
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  case SQLCOM_SHOW_MASTER_STAT:
1936
  {
1937 1938
    /* 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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1944
  case SQLCOM_LOAD_MASTER_DATA: // sync with master
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    if (check_global_access(thd, SUPER_ACL))
1946
      goto error;
1947 1948 1949 1950
    if (end_active_trans(thd))
      res= -1;
    else
      res = load_master_data(thd);
1951
    break;
1952
#endif /* EMBEDDED_LIBRARY */
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#ifdef HAVE_INNOBASE_DB
  case SQLCOM_SHOW_INNODB_STATUS:
    {
1957
      if (check_global_access(thd, SUPER_ACL))
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	goto error;
      res = innodb_show_status(thd);
      break;
    }
#endif
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1964
#ifndef EMBEDDED_LIBRARY
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  case SQLCOM_LOAD_MASTER_TABLE:
1966
  {
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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)
1979
	goto error;
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1980
    }
1981
    if (strlen(tables->real_name) > NAME_LEN)
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    {
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      net_printf(thd,ER_WRONG_TABLE_NAME,tables->real_name);
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      break;
    }
1986 1987 1988 1989 1990
    LOCK_ACTIVE_MI;
    // fetch_master_table will send the error to the client on failure
    if (!fetch_master_table(thd, tables->db, tables->real_name,
			    active_mi, 0))
    {
1991
      send_ok(thd);
1992 1993
    }
    UNLOCK_ACTIVE_MI;
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    break;
1995
  }
1996 1997
#endif /* EMBEDDED_LIBRARY */

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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);
2002 2003
    if (!tables->db)
      tables->db=thd->db;
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    if (check_access(thd,want_priv,tables->db,&tables->grant.privilege) ||
2005 2006 2007
	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;
    }
2019
    if (strlen(tables->real_name) > NAME_LEN)
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    {
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      net_printf(thd, ER_WRONG_TABLE_NAME, tables->alias);
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2022 2023 2024
      res=0;
      break;
    }
2025 2026 2027
#ifndef HAVE_READLINK
    lex->create_info.data_file_name=lex->create_info.index_file_name=0;
#else
2028
    /* Fix names if symlinked tables */
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    if (append_file_to_dir(thd, &lex->create_info.data_file_name,
2030
			   tables->real_name) ||
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	append_file_to_dir(thd,&lex->create_info.index_file_name,
2032
			   tables->real_name))
2033 2034 2035 2036
    {
      res=-1;
      break;
    }
2037
#endif
2038
    if (select_lex->item_list.elements)		// With select
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2039 2040 2041 2042
    {
      select_result *result;

      if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
2043
	  find_real_table_in_list(tables->next, tables->db, tables->real_name))
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2044
      {
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	net_printf(thd,ER_UPDATE_TABLE_USED,tables->real_name);
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2046 2047 2048 2049 2050 2051 2052
	DBUG_VOID_RETURN;
      }
      if (tables->next)
      {
	if (check_table_access(thd, SELECT_ACL, tables->next))
	  goto error;				// Error message is given
      }
2053
      select_lex->options|= SELECT_NO_UNLOCK;
2054 2055 2056 2057 2058
      unit->offset_limit_cnt= select_lex->offset_limit;
      unit->select_limit_cnt= select_lex->select_limit+
	select_lex->offset_limit;
      if (unit->select_limit_cnt < select_lex->select_limit)
	unit->select_limit_cnt= HA_POS_ERROR;		// No limit
2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074

      /* 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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2075 2076
    else // regular create
    {
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      if (lex->name)
        res= mysql_create_like_table(thd, tables, &lex->create_info, 
                                     (Table_ident *)lex->name); 
      else
2081 2082 2083 2084 2085 2086 2087 2088 2089
      {
	List_iterator<create_field> fields(lex->create_list);
	create_field *field;
	while ((field= fields++))
	{
	  if (!field->charset)
	    field->charset= lex->create_info.table_charset;
	  field->create_length_to_internal_length();
	}
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        res= mysql_create_table(thd,tables->db ? tables->db : thd->db,
			         tables->real_name, &lex->create_info,
			         lex->create_list,
			         lex->key_list,0,0,0); // do logging
2094
      }
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      if (!res)
2096
	send_ok(thd);
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    }
    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;
2107 2108 2109 2110
    if (end_active_trans(thd))
      res= -1;
    else
      res = mysql_create_index(thd, tables, lex->key_list);
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    break;

2113
#ifndef EMBEDDED_LIBRARY
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2114
  case SQLCOM_SLAVE_START:
2115 2116 2117 2118
  {
    LOCK_ACTIVE_MI;
    start_slave(thd,active_mi,1 /* net report*/);
    UNLOCK_ACTIVE_MI;
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    break;
2120
  }
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  case SQLCOM_SLAVE_STOP:
2122 2123 2124 2125 2126 2127
  /*
    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,
2128
      so it waits for the client thread because t is locked by it.
2129
    - then the client thread does SLAVE STOP.
2130 2131
      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.
2132 2133 2134 2135 2136
    To prevent that, refuse SLAVE STOP if the
    client thread has locked tables
  */
  if (thd->locked_tables || thd->active_transaction())
  {
2137
    send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
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2138
    break;
2139
  }
2140 2141 2142 2143
  {
    LOCK_ACTIVE_MI;
    stop_slave(thd,active_mi,1/* net report*/);
    UNLOCK_ACTIVE_MI;
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2144
    break;
2145
  }
2146 2147
#endif

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2148 2149
  case SQLCOM_ALTER_TABLE:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
2150
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
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2151 2152 2153
    break;
#else
    {
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      ulong priv=0;
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2155
      if (lex->name && (!lex->name[0] || strlen(lex->name) > NAME_LEN))
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2156
      {
2157
	net_printf(thd,ER_WRONG_TABLE_NAME,lex->name);
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2158 2159 2160
	res=0;
	break;
      }
2161 2162
      if (!tables->db)
	tables->db=thd->db;
2163 2164
      if (!select_lex->db)
	select_lex->db=tables->db;
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      if (check_access(thd,ALTER_ACL,tables->db,&tables->grant.privilege) ||
2166
	  check_access(thd,INSERT_ACL | CREATE_ACL,select_lex->db,&priv) ||
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	  check_merge_table_access(thd, tables->db,
2168 2169 2170
				   (TABLE_LIST *)
				   lex->create_info.merge_list.first))
	goto error;				/* purecov: inspected */
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2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181
      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;
2182
	  tmp_table.db=select_lex->db;
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2183 2184 2185 2186 2187
	  tmp_table.grant.privilege=priv;
	  if (check_grant(thd,INSERT_ACL | CREATE_ACL,tables))
	    goto error;
	}
      }
2188 2189
      /* 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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2190
      /* ALTER TABLE ends previous transaction */
2191
      if (end_active_trans(thd))
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2192 2193
	res= -1;
      else
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2194
      {
2195
	res= mysql_alter_table(thd, select_lex->db, lex->name,
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2196 2197 2198
			       &lex->create_info,
			       tables, lex->create_list,
			       lex->key_list, lex->drop_list, lex->alter_list,
2199
			       select_lex->order_list.elements,
2200
                               (ORDER *) select_lex->order_list.first,
2201 2202
			       lex->drop_primary, lex->duplicates,
			       lex->alter_keys_onoff, lex->simple_alter);
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2203
      }
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2204 2205 2206
      break;
    }
#endif
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  case SQLCOM_RENAME_TABLE:
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2208 2209 2210
  {
    TABLE_LIST *table;
    if (check_db_used(thd,tables))
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2211
      goto error;
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    for (table=tables ; table ; table=table->next->next)
    {
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2214 2215
      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
		       &table->grant.privilege) ||
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2216 2217 2218 2219 2220
	  check_access(thd, INSERT_ACL | CREATE_ACL, table->next->db,
		       &table->next->grant.privilege))
	goto error;
      if (grant_option)
      {
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2221 2222 2223 2224 2225
	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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2226
	    (!test_all_bits(table->next->grant.privilege,
2227
			    INSERT_ACL | CREATE_ACL) &&
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2228
	     check_grant(thd,INSERT_ACL | CREATE_ACL, &new_list)))
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2229 2230 2231
	  goto error;
      }
    }
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2232
    query_cache_invalidate3(thd, tables, 0);
2233 2234 2235
    if (end_active_trans(thd))
      res= -1;
    else if (mysql_rename_tables(thd,tables))
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2236 2237
      res= -1;
    break;
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2238
  }
2239
#ifndef EMBEDDED_LIBRARY
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2240 2241
  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2242
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
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2243 2244 2245
    DBUG_VOID_RETURN;
#else
    {
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2246
      if (check_global_access(thd, SUPER_ACL))
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2247 2248 2249 2250
	goto error;
      res = show_binlogs(thd);
      break;
    }
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2251
#endif
2252
#endif /* EMBEDDED_LIBRARY */
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2253
  case SQLCOM_SHOW_CREATE:
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2254
#ifdef DONT_ALLOW_SHOW_COMMANDS
2255
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
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2256 2257
    DBUG_VOID_RETURN;
#else
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2258
    {
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2259 2260 2261 2262
      if (check_db_used(thd, tables) ||
	  check_access(thd, SELECT_ACL | EXTRA_ACL, tables->db,
		       &tables->grant.privilege))
	goto error;
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2263
      res = mysqld_show_create(thd, tables);
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      break;
    }
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#endif
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  case SQLCOM_REPAIR:
2268 2269 2270 2271 2272
  {
    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);
2273 2274 2275 2276 2277 2278 2279 2280 2281 2282
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      mysql_update_log.write(thd, thd->query, thd->query_length);
      if (mysql_bin_log.is_open())
      {
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
        mysql_bin_log.write(&qinfo);
      }
    }
2283 2284
    break;
  }
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  case SQLCOM_CHECK:
2286 2287 2288 2289 2290 2291 2292
  {
    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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2293 2294
  case SQLCOM_ANALYZE:
  {
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2295 2296
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables))
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2297
      goto error; /* purecov: inspected */
2298
    res = mysql_analyze_table(thd, tables, &lex->check_opt);
2299 2300 2301 2302 2303 2304 2305 2306 2307 2308
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      mysql_update_log.write(thd, thd->query, thd->query_length);
      if (mysql_bin_log.is_open())
      {
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
        mysql_bin_log.write(&qinfo);
      }
    }
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    break;
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2310
  }
2311

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  case SQLCOM_OPTIMIZE:
  {
    HA_CREATE_INFO create_info;
2315 2316
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables))
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      goto error; /* purecov: inspected */
2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328
    if (specialflag & (SPECIAL_SAFE_MODE | SPECIAL_NO_NEW_FUNC))
    {
      /* Use ALTER TABLE */
      lex->create_list.empty();
      lex->key_list.empty();
      lex->col_list.empty();
      lex->drop_list.empty();
      lex->alter_list.empty();
      bzero((char*) &create_info,sizeof(create_info));
      create_info.db_type=DB_TYPE_DEFAULT;
      create_info.row_type=ROW_TYPE_DEFAULT;
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      create_info.table_charset=default_charset_info;
2330 2331 2332
      res= mysql_alter_table(thd, NullS, NullS, &create_info,
			     tables, lex->create_list,
			     lex->key_list, lex->drop_list, lex->alter_list,
2333 2334
                             0, (ORDER *) 0,
			     0, DUP_ERROR);
2335 2336 2337
    }
    else
      res = mysql_optimize_table(thd, tables, &lex->check_opt);
2338 2339 2340 2341 2342 2343 2344 2345 2346 2347
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      mysql_update_log.write(thd, thd->query, thd->query_length);
      if (mysql_bin_log.is_open())
      {
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
        mysql_bin_log.write(&qinfo);
      }
    }
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2348 2349 2350
    break;
  }
  case SQLCOM_UPDATE:
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2351
    if (check_db_used(thd,tables))
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2352
      goto error;
2353

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    if (single_table_command_access(thd, UPDATE_ACL, tables, &res))
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2355
	goto error;
2356

2357
    if (select_lex->item_list.elements != lex->value_list.elements)
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2358
    {
2359
      send_error(thd,ER_WRONG_VALUE_COUNT);
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2360 2361
      DBUG_VOID_RETURN;
    }
2362 2363 2364 2365
    res= mysql_update(thd,tables,
                      select_lex->item_list,
                      lex->value_list,
                      select_lex->where,
2366
		      select_lex->order_list.elements,
2367 2368 2369
                      (ORDER *) select_lex->order_list.first,
                      select_lex->select_limit,
                      lex->duplicates);
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2370 2371
    if (thd->net.report_error)
      res= -1;
2372 2373 2374 2375 2376 2377 2378
    break;
  case SQLCOM_UPDATE_MULTI:
    if (check_access(thd,UPDATE_ACL,tables->db,&tables->grant.privilege))
      goto error;
    if (grant_option && check_grant(thd,UPDATE_ACL,tables))
      goto error;
    if (select_lex->item_list.elements != lex->value_list.elements)
2379
    {
2380 2381
      send_error(thd,ER_WRONG_VALUE_COUNT);
      DBUG_VOID_RETURN;
2382 2383
    }
    {
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      const char *msg= 0;
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      if (select_lex->order_list.elements)
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	msg= "ORDER BY";
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      else if (select_lex->select_limit && select_lex->select_limit !=
	       HA_POS_ERROR)
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	msg= "LIMIT";
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2390
      if (msg)
2391
      {
2392
	net_printf(thd, ER_WRONG_USAGE, "UPDATE", msg);
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2393 2394
	res= 1;
	break;
2395
      }
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2396 2397 2398 2399 2400
      res= mysql_multi_update(thd,tables,
			      &select_lex->item_list,
			      &lex->value_list,
			      select_lex->where,
			      select_lex->options,
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2401
			      lex->duplicates, unit, select_lex);
2402
    }
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    break;
  case SQLCOM_REPLACE:
2405 2406
  case SQLCOM_INSERT:
  {
2407
    my_bool update=(lex->value_list.elements ? UPDATE_ACL : 0);
2408
    ulong privilege= (lex->duplicates == DUP_REPLACE ?
2409
                      INSERT_ACL | DELETE_ACL : INSERT_ACL | update);
2410

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    if (single_table_command_access(thd, privilege, tables, &res))
2412 2413
	goto error;

2414 2415 2416 2417 2418
    if (select_lex->item_list.elements != lex->value_list.elements)
    {
      send_error(thd,ER_WRONG_VALUE_COUNT);
      DBUG_VOID_RETURN;
    }
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    res = mysql_insert(thd,tables,lex->field_list,lex->many_values,
2420
                       select_lex->item_list, lex->value_list,
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2421
                       (update ? DUP_UPDATE : lex->duplicates));
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    if (thd->net.report_error)
      res= -1;
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    break;
2425
  }
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  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
2429

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    /*
      Check that we have modify privileges for the first table and
      select privileges for the rest
    */
2434
    {
2435 2436
      ulong privilege= (lex->duplicates == DUP_REPLACE ?
                        INSERT_ACL | DELETE_ACL : INSERT_ACL);
2437 2438 2439 2440 2441 2442 2443 2444 2445 2446
      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;
    }
2447 2448
    /* Don't unlock tables until command is written to binary log */
    select_lex->options|= SELECT_NO_UNLOCK;
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    select_result *result;
2451 2452 2453 2454
    unit->offset_limit_cnt= select_lex->offset_limit;
    unit->select_limit_cnt= select_lex->select_limit+select_lex->offset_limit;
    if (unit->select_limit_cnt < select_lex->select_limit)
      unit->select_limit_cnt= HA_POS_ERROR;		// No limit
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2455

2456
    if (find_real_table_in_list(tables->next, tables->db, tables->real_name))
2457
    {
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      net_printf(thd,ER_UPDATE_TABLE_USED,tables->real_name);
2459
      DBUG_VOID_RETURN;
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    }
2461 2462 2463 2464 2465 2466 2467

    /* 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,
2468
				    lex->duplicates)))
2469
	res=handle_select(thd,lex,result);
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      if (thd->net.report_error)
	res= -1;
2472 2473 2474
    }
    else
      res= -1;
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    break;
  }
2477
  case SQLCOM_TRUNCATE:
2478 2479
    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;
2482 2483 2484 2485 2486 2487
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
    if (thd->locked_tables || thd->active_transaction())
    {
2488
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION,NullS);
2489 2490 2491 2492
      goto error;
    }
    res=mysql_truncate(thd,tables);
    break;
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  case SQLCOM_DELETE:
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  {
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    if (single_table_command_access(thd, DELETE_ACL, tables, &res))
      goto error;
2497

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    // 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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    if (thd->net.report_error)
      res= -1;
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    break;
  }
2507
  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) ||
2516
	check_table_access(thd,SELECT_ACL, tables) ||
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	check_table_access(thd,DELETE_ACL, aux_tables))
      goto error;
    if ((thd->options & OPTION_SAFE_UPDATES) && !select_lex->where)
2520
    {
2521
      send_error(thd,ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE);
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      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)
      {
2537
	net_printf(thd,ER_NONUNIQ_TABLE,auxi->real_name);
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	goto error;
      }
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      walk->lock_type= auxi->lock_type;
2541
      auxi->table_list=  walk;		// Remember corresponding table
2542
    }
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    if (add_item_to_list(thd, new Item_null()))
2544
    {
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      res= -1;
2546
      break;
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    }
    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)
2553
      auxi->table= auxi->table_list->table;
2554
    if (&lex->select_lex != lex->all_selects_list)
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    {
2556 2557 2558 2559 2560
      for (TABLE_LIST *t= select_lex->get_table_list();
	   t; t= t->next)
      {
	if (find_real_table_in_list(t->table_list->next, t->db, t->real_name))
	{
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	  my_error(ER_UPDATE_TABLE_USED, MYF(0), t->real_name);
2562 2563 2564 2565
	  res= -1;
	  break;
	}
      }
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    }
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    fix_tables_pointers(lex->all_selects_list);
2568 2569
    if (!thd->is_fatal_error && (result= new multi_delete(thd,aux_tables,
							  table_count)))
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    {
2571 2572 2573
      res= mysql_select(thd, &select_lex->ref_pointer_array,
			select_lex->get_table_list(),
			select_lex->with_wild,
2574
			select_lex->item_list,
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			select_lex->where,
2576
			0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
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			(ORDER *)NULL,
			select_lex->options | thd->options |
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			SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK,
2580
			result, unit, select_lex, 0);
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      if (thd->net.report_error)
	res= -1;
2583
      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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  {
2592 2593 2594 2595 2596 2597 2598 2599 2600 2601
    if (!lex->drop_temporary)
    {
      if (check_table_access(thd,DROP_ACL,tables))
	goto error;				/* purecov: inspected */
      if (end_active_trans(thd))
      {
	res= -1;
	break;
      }
    }
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    else
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    {
      /*
	If this is a slave thread, we may sometimes execute some 
	DROP / * 40005 TEMPORARY * / TABLE
	that come from parts of binlogs (likely if we use RESET SLAVE or CHANGE
	MASTER TO), while the temporary table has already been dropped.
	To not generate such irrelevant "table does not exist errors", we
	silently add IF EXISTS if TEMPORARY was used.
      */
      if (thd->slave_thread)
	lex->drop_if_exists= 1;
    }
2615
    res= mysql_rm_table(thd,tables,lex->drop_if_exists, lex->drop_temporary);
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  }
  break;
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  case SQLCOM_DROP_INDEX:
    if (!tables->db)
      tables->db=thd->db;
    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;
2625 2626 2627 2628
    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:
2631
#if defined(DONT_ALLOW_SHOW_COMMANDS)
2632
    send_error(thd,ER_NOT_ALLOWED_COMMAND);   /* purecov: inspected */
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    DBUG_VOID_RETURN;
#else
    if ((specialflag & SPECIAL_SKIP_SHOW_DB) &&
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	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;
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  case SQLCOM_SHOW_TABLE_TYPES:
    res= mysqld_show_table_types(thd);
    break;
  case SQLCOM_SHOW_PRIVILEGES:
    res= mysqld_show_privileges(thd);
    break;
  case SQLCOM_SHOW_COLUMN_TYPES:
    res= mysqld_show_column_types(thd);
    break;
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  case SQLCOM_SHOW_STATUS:
2657
    res= mysqld_show(thd,(lex->wild ? lex->wild->ptr() : NullS),status_vars,
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2658
		     OPT_GLOBAL);
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    break;
  case SQLCOM_SHOW_VARIABLES:
    res= mysqld_show(thd, (lex->wild ? lex->wild->ptr() : NullS),
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		     init_vars, lex->option_type);
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2663
    break;
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  case SQLCOM_SHOW_LOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2666
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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2667 2668 2669 2670 2671 2672 2673 2674 2675
    DBUG_VOID_RETURN;
#else
    {
      if (grant_option && check_access(thd, FILE_ACL, any_db))
	goto error;
      res= mysqld_show_logs(thd);
      break;
    }
#endif
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  case SQLCOM_SHOW_TABLES:
2677
    /* FALL THROUGH */
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#ifdef DONT_ALLOW_SHOW_COMMANDS
2679
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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    DBUG_VOID_RETURN;
#else
    {
2683
      char *db=select_lex->db ? select_lex->db : thd->db;
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2684 2685
      if (!db)
      {
2686
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
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	goto error;				/* purecov: inspected */
      }
      remove_escape(db);				// Fix escaped '_'
2690
      if (check_db_name(db))
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2691
      {
2692
        net_printf(thd,ER_WRONG_DB_NAME, db);
2693
        goto error;
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2694 2695 2696 2697
      }
      if (check_access(thd,SELECT_ACL,db,&thd->col_access))
	goto error;				/* purecov: inspected */
      /* grant is checked in mysqld_show_tables */
2698
      if (select_lex->options & SELECT_DESCRIBE)
2699
        res= mysqld_extend_show_tables(thd,db,
2700
				       (lex->wild ? lex->wild->ptr() : NullS));
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2701 2702 2703 2704 2705 2706
      else
	res= mysqld_show_tables(thd,db,
				(lex->wild ? lex->wild->ptr() : NullS));
      break;
    }
#endif
2707 2708 2709
  case SQLCOM_SHOW_OPEN_TABLES:
    res= mysqld_show_open_tables(thd,(lex->wild ? lex->wild->ptr() : NullS));
    break;
2710 2711
  case SQLCOM_SHOW_CHARSETS:
    res= mysqld_show_charsets(thd,(lex->wild ? lex->wild->ptr() : NullS));
2712
    break;
2713 2714 2715
  case SQLCOM_SHOW_COLLATIONS:
    res= mysqld_show_collations(thd,(lex->wild ? lex->wild->ptr() : NullS));
    break;
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  case SQLCOM_SHOW_FIELDS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2718
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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    DBUG_VOID_RETURN;
#else
    {
2722 2723
      char *db=tables->db;
      if (!*db)
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2724
      {
2725
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
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	goto error;				/* purecov: inspected */
      }
      remove_escape(db);			// Fix escaped '_'
2729
      remove_escape(tables->real_name);
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2730 2731 2732 2733 2734 2735
      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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2736 2737
			      (lex->wild ? lex->wild->ptr() : NullS),
			      lex->verbose);
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      break;
    }
#endif
  case SQLCOM_SHOW_KEYS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2743
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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    DBUG_VOID_RETURN;
#else
    {
2747
      char *db=tables->db;
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      if (!db)
      {
2750
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
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	goto error;				/* purecov: inspected */
      }
      remove_escape(db);			// Fix escaped '_'
2754
      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:
2767
    mysql_change_db(thd,select_lex->db);
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    break;
2769
#ifndef EMBEDDED_LIBRARY
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  case SQLCOM_LOAD:
  {
    uint privilege= (lex->duplicates == DUP_REPLACE ?
2773
		     INSERT_ACL | DELETE_ACL : INSERT_ACL);
2774 2775

    if (!lex->local_file)
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    {
      if (check_access(thd,privilege | FILE_ACL,tables->db))
	goto error;
    }
    else
    {
2782
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
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2783
	  ! opt_local_infile)
2784
      {
2785
	send_error(thd,ER_NOT_ALLOWED_COMMAND);
2786 2787
	goto error;
      }
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      if (check_access(thd,privilege,tables->db,&tables->grant.privilege) ||
2789
	  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;
  }
2796
#endif /* EMBEDDED_LIBRARY */
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  case SQLCOM_SET_OPTION:
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    if (tables && ((res= check_table_access(thd, SELECT_ACL, tables)) ||
		   (res= open_and_lock_tables(thd,tables))))
      break;
    fix_tables_pointers(lex->all_selects_list);
    if (!(res= sql_set_variables(thd, &lex->var_list)))
2803
      send_ok(thd);
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    if (thd->net.report_error)
      res= -1;
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    break;
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  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)
2816
      unlock_global_read_lock(thd);
2817
    send_ok(thd);
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    break;
  case SQLCOM_LOCK_TABLES:
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    unlock_locked_tables(thd);
2821
    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))
2824
      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;
2831
      send_ok(thd);
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    }
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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:
2838
  {
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2839
    if (!strip_sp(lex->name) || check_db_name(lex->name))
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    {
2841
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
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      break;
    }
2844 2845 2846 2847 2848 2849 2850
    /*
      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.
    */
2851
#ifdef HAVE_REPLICATION
2852 2853 2854 2855
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
      break;
2856
#endif
2857 2858
    if (check_access(thd,CREATE_ACL,lex->name,0,1))
      break;
2859
    res=mysql_create_db(thd,lex->name,&lex->create_info,0);
2860 2861
    break;
  }
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  case SQLCOM_DROP_DB:
2863
  {
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    if (!strip_sp(lex->name) || check_db_name(lex->name))
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    {
2866
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
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      break;
    }
2869 2870 2871 2872 2873 2874 2875
    /*
      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.
    */
2876
#ifdef HAVE_REPLICATION
2877 2878 2879 2880
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
      break;
2881
#endif
2882
    if (check_access(thd,DROP_ACL,lex->name,0,1))
2883
      break;
2884 2885
    if (thd->locked_tables || thd->active_transaction())
    {
2886
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
2887 2888
      goto error;
    }
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    res=mysql_rm_db(thd,lex->name,lex->drop_if_exists,0);
2890 2891
    break;
  }
2892 2893 2894 2895
  case SQLCOM_ALTER_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
2896
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
2897 2898
      break;
    }
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    if (check_access(thd,ALTER_ACL,lex->name,0,1))
2900 2901 2902
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
2903
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
2904 2905
      goto error;
    }
2906
    res=mysql_alter_db(thd,lex->name,&lex->create_info);
2907 2908
    break;
  }
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  case SQLCOM_SHOW_CREATE_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
2913
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
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      break;
    }
    if (check_access(thd,DROP_ACL,lex->name,0,1))
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
2920
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
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      goto error;
    }
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    res=mysqld_show_create_db(thd,lex->name,&lex->create_info);
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    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)))
2931
      send_ok(thd);
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#else
    res= -1;
#endif
    break;
  case SQLCOM_DROP_FUNCTION:
    if (check_access(thd,DELETE_ACL,"mysql",0,1))
      break;
#ifdef HAVE_DLOPEN
2940
    if (!(res = mysql_drop_function(thd,&lex->udf.name)))
2941
      send_ok(thd);
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#else
    res= -1;
#endif
    break;
2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977
  case SQLCOM_DROP_USER:
  {
    if (check_access(thd, GRANT_ACL,"mysql",0,1))
      break;
    if (!(res= mysql_drop_user(thd, lex->users_list)))
    {
      mysql_update_log.write(thd, thd->query, thd->query_length);
      if (mysql_bin_log.is_open())
      {
	Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
	mysql_bin_log.write(&qinfo);
      }
      send_ok(thd);
    }
    break;
  }
  case SQLCOM_REVOKE_ALL:
  {
    if (check_access(thd, GRANT_ACL ,"mysql",0,1))
      break;
    if (!(res = mysql_revoke_all(thd, lex->users_list)))
    {
      mysql_update_log.write(thd, thd->query, thd->query_length);
      if (mysql_bin_log.is_open())
      {
	Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
	mysql_bin_log.write(&qinfo);
      }
      send_ok(thd);
    }
    break;
  }
2978 2979 2980 2981 2982 2983 2984 2985 2986
  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
    */
2991 2992 2993 2994 2995 2996 2997 2998 2999 3000

    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 &&
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	     my_strcasecmp(&my_charset_latin1,
3002
                           user->host.str, thd->host_or_ip)))
3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016
	{
	  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)))
3020
      {
3021
	mysql_update_log.write(thd, thd->query, thd->query_length);
3022 3023
	if (mysql_bin_log.is_open())
	{
3024
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
3025 3026 3027 3028 3029 3030 3031 3032
	  mysql_bin_log.write(&qinfo);
	}
      }
    }
    else
    {
      if (lex->columns.elements)
      {
3033
	send_error(thd,ER_ILLEGAL_GRANT_FOR_TABLE);
3034 3035 3036 3037 3038 3039 3040
	res=1;
      }
      else
	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
			  lex->sql_command == SQLCOM_REVOKE);
      if (!res)
      {
3041
	mysql_update_log.write(thd, thd->query, thd->query_length);
3042 3043
	if (mysql_bin_log.is_open())
	{
3044
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
3045 3046
	  mysql_bin_log.write(&qinfo);
	}
3047
	if (mqh_used && lex->sql_command == SQLCOM_GRANT)
3048
	{
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	  List_iterator <LEX_USER> str_list(lex->users_list);
	  LEX_USER *user;
	  while ((user=str_list++))
3052
	    reset_mqh(thd,user);
3053
	}
3054 3055 3056 3057
      }
    }
    break;
  }
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  case SQLCOM_RESET:
3059 3060 3061 3062 3063 3064 3065
    /* 
       RESET commands are never written to the binary log, so we have to
       initialize this variable because RESET shares the same code as FLUSH
    */
    lex->no_write_to_binlog= 1;
  case SQLCOM_FLUSH:
  {
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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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    /*
      reload_acl_and_cache() will tell us if we are allowed to write to the
      binlog or not.
    */
    bool write_to_binlog;
    if (reload_acl_and_cache(thd, lex->type, tables, &write_to_binlog))
      send_error(thd, 0);
    else
    {
      /*
        We WANT to write and we CAN write.
        ! we write after unlocking the table.
      */
      if (!lex->no_write_to_binlog && write_to_binlog)
      {
        mysql_update_log.write(thd, thd->query, thd->query_length);
        if (mysql_bin_log.is_open())
        {
          Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
          mysql_bin_log.write(&qinfo);
        }
      }
      send_ok(thd);
    }
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    break;
3093
  }
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  case SQLCOM_KILL:
    kill_one_thread(thd,lex->thread_id);
    break;
  case SQLCOM_SHOW_GRANTS:
    res=0;
3099 3100
    if ((thd->priv_user &&
	 !strcmp(thd->priv_user,lex->grant_user->user.str)) ||
3101
	!check_access(thd, SELECT_ACL, "mysql",0,1))
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    {
      res = mysql_show_grants(thd,lex->grant_user);
    }
    break;
3106
  case SQLCOM_HA_OPEN:
3107 3108
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL, tables))
3109 3110 3111 3112 3113 3114 3115 3116 3117
      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:
3118 3119
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL, tables))
3120
      goto error;
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    res = mysql_ha_read(thd, tables, lex->ha_read_mode, lex->backup_dir,
3122 3123
			lex->insert_list, lex->ha_rkey_mode, select_lex->where,
			select_lex->select_limit, select_lex->offset_limit);
3124 3125
    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
    {
3139
      thd->options= ((thd->options & (ulong) ~(OPTION_STATUS_NO_TRANS_UPDATE)) |
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		     OPTION_BEGIN);
      thd->server_status|= SERVER_STATUS_IN_TRANS;
3142
      send_ok(thd);
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    }
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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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  {
3152
    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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    {
3156
      send_ok(thd);
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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))
3165 3166
    {
      if (thd->options & OPTION_STATUS_NO_TRANS_UPDATE)
3167
	send_warning(thd,ER_WARNING_NOT_COMPLETE_ROLLBACK,0);
3168
      else
3169
	send_ok(thd);
3170
    }
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    else
      res= -1;
3173
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
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    break;
  default:					/* Impossible */
3176
    send_ok(thd);
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    break;
  }
  thd->proc_info="query end";			// QQ
  if (res < 0)
3181
    send_error(thd,thd->killed ? ER_SERVER_SHUTDOWN : 0);
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error:
  DBUG_VOID_RETURN;
}


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

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

  RETURN
    0 - OK
    1 - access denied
*/

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

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

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


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

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

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

bool
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check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
3249
	     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;

3260
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
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  {
3262
    if (!no_errors)
3263
      send_error(thd,ER_NO_DB_ERROR);	/* purecov: tested */
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    DBUG_RETURN(TRUE);				/* purecov: tested */
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  }

  if ((thd->master_access & want_access) == want_access)
  {
3269 3270 3271 3272 3273 3274 3275 3276 3277
    /*
      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,
3278
			thd->priv_user, db, test(want_access & GRANT_ACL));
3279
    *save_priv=thd->master_access | db_access;
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    DBUG_RETURN(FALSE);
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  }
3282
  if (((want_access & ~thd->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
3283
      ! db && dont_check_global_grants)
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  {						// We can never grant this
3285
    if (!no_errors)
3286
      net_printf(thd,ER_ACCESS_DENIED_ERROR,
3287
		 thd->priv_user,
3288
		 thd->priv_host,
3289
		 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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3295

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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,
3298
		      thd->priv_user, db, test(want_access & GRANT_ACL));
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  else
    db_access=thd->db_access;
3301 3302
  // 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);
3304 3305

  /* grant_option is set if there exists a single table or column grant */
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  if (db_access == want_access ||
3307 3308
      ((grant_option && !dont_check_global_grants) &&
       !(want_access & ~TABLE_ACLS)))
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    DBUG_RETURN(FALSE);				/* Ok */
3310
  if (!no_errors)
3311
    net_printf(thd,ER_DBACCESS_DENIED_ERROR,
3312
	       thd->priv_user,
3313
	       thd->priv_host,
3314
	       db ? db : thd->db ? thd->db : "unknown"); /* purecov: tested */
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  DBUG_RETURN(TRUE);				/* purecov: tested */
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}


3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336
/*
  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];
3341
  if ((thd->master_access & want_access))
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    return 0;
  get_privilege_desc(command, sizeof(command), want_access);
3344
  net_printf(thd,ER_SPECIFIC_ACCESS_DENIED_ERROR,
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	     command);
  return 1;
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}


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

3355
bool
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check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
3357
		   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)
  {
3364
    if (tables->derived || (tables->table && (int)tables->table->tmp_table))
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      continue;
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    if ((thd->master_access & want_access) == (want_access & ~EXTRA_ACL) &&
	thd->db)
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      tables->grant.privilege= want_access;
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    else if (tables->db && tables->db == thd->db)
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    {
      if (found && !grant_option)		// db already checked
	tables->grant.privilege=found_access;
      else
      {
3375 3376
	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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      }
    }
3382
    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
3383
			  0, no_errors))
3384
      return TRUE;
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  }
  if (grant_option)
3387
    return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
3388
		       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))
      {
3401
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: tested */
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	return TRUE;				/* purecov: tested */
      }
    }
  }
  return FALSE;
}


3410 3411
static bool check_merge_table_access(THD *thd, char *db,
				     TABLE_LIST *table_list)
3412 3413 3414 3415
{
  int error=0;
  if (table_list)
  {
3416
    /* Check that all tables use the current database */
3417 3418
    TABLE_LIST *tmp;
    for (tmp=table_list; tmp ; tmp=tmp->next)
3419 3420 3421 3422
    {
      if (!tmp->db || !tmp->db[0])
	tmp->db=db;
    }
3423 3424 3425 3426 3427 3428 3429
    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

3440
#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));
3449
    thd->fatal_error();
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    return 1;
  }
  return 0;
}
3454
#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;
}


/****************************************************************************
3489
  Initialize global thd variables needed for query
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****************************************************************************/

3492
void
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mysql_init_query(THD *thd)
{
  DBUG_ENTER("mysql_init_query");
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  LEX *lex=&thd->lex;
  lex->unit.init_query();
  lex->unit.init_select();
3499
  lex->unit.thd= thd;
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  lex->select_lex.init_query();
  lex->value_list.empty();
  lex->param_list.empty();
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  lex->unit.next= lex->unit.master= lex->unit.return_to= 
    lex->unit.link_next= 0;
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  lex->unit.prev= lex->unit.link_prev= 0;
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  lex->unit.global_parameters= lex->unit.slave= lex->current_select=
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    lex->all_selects_list= &lex->select_lex;
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  lex->select_lex.master= &lex->unit;
  lex->select_lex.prev= &lex->unit.slave;
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  lex->select_lex.link_next= lex->select_lex.slave= lex->select_lex.next= 0;
3511
  lex->select_lex.link_prev= (st_select_lex_node**)&(lex->all_selects_list);
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  lex->describe= 0;
  lex->derived_tables= FALSE;
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  lex->lock_option= TL_READ;
  lex->found_colon= 0;
3516
  lex->safe_to_cache_query= 1;
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  thd->select_number= lex->select_lex.select_number= 1;
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  thd->free_list= 0;
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  thd->total_warn_count=0;			// Warnings for this query
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  thd->last_insert_id_used= thd->query_start_used= thd->insert_id_used=0;
  thd->sent_row_count= thd->examined_row_count= 0;
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  thd->is_fatal_error= thd->rand_used= 0;
3523
  thd->server_status &= ~SERVER_MORE_RESULTS_EXISTS;
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  thd->tmp_table_used= 0;
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  if (opt_bin_log)
    reset_dynamic(&thd->user_var_events);
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  thd->clear_error();
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  DBUG_VOID_RETURN;
}

3531

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void
mysql_init_select(LEX *lex)
{
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  SELECT_LEX *select_lex= lex->current_select->select_lex();
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  select_lex->init_select();
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  select_lex->master_unit()->select_limit= select_lex->select_limit=
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    lex->thd->variables.select_limit;
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  if (select_lex == &lex->select_lex)
  {
    lex->exchange= 0;
    lex->result= 0;
    lex->proc_list.first= 0;
  }
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}

3547

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bool
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mysql_new_select(LEX *lex, bool move_down)
3550
{
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  SELECT_LEX *select_lex = new SELECT_LEX();
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  if (!select_lex)
    return 1;
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  select_lex->select_number= ++lex->thd->select_number;
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  select_lex->init_query();
  select_lex->init_select();
  if (move_down)
  {
    /* first select_lex of subselect or derived table */
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    SELECT_LEX_UNIT *unit= new SELECT_LEX_UNIT();
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    if (!unit)
      return 1;
    unit->init_query();
    unit->init_select();
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    unit->thd= lex->thd;
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    if (lex->current_select->linkage == GLOBAL_OPTIONS_TYPE)
      unit->include_neighbour(lex->current_select);
    else
      unit->include_down(lex->current_select);
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    unit->link_next= 0;
    unit->link_prev= 0;
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    unit->return_to= lex->current_select;
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    select_lex->include_down(unit);
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    // TODO: assign resolve_mode for fake subquery after merging with new tree
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  }
  else
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    select_lex->include_neighbour(lex->current_select);
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  select_lex->master_unit()->global_parameters= select_lex;
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  select_lex->include_global((st_select_lex_node**)&lex->all_selects_list);
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  lex->current_select= select_lex;
3582
  select_lex->resolve_mode= SELECT_LEX::SELECT_MODE;
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  return 0;
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}
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/*
  Create a select to return the same output as 'SELECT @@var_name'.

  SYNOPSIS
    create_select_for_variable()
    var_name		Variable name

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

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

void create_select_for_variable(const char *var_name)
{
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  THD *thd;
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  LEX *lex;
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  LEX_STRING tmp, null_lex_string;
3604
  DBUG_ENTER("create_select_for_variable");
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  thd= current_thd;
  lex= &thd->lex;
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  mysql_init_select(lex);
  lex->sql_command= SQLCOM_SELECT;
  tmp.str= (char*) var_name;
  tmp.length=strlen(var_name);
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  bzero((char*) &null_lex_string.str, sizeof(null_lex_string));
  add_item_to_list(thd, get_system_var(thd, OPT_SESSION, tmp,
				       null_lex_string));
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  DBUG_VOID_RETURN;
}

3618

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void mysql_init_multi_delete(LEX *lex)
{
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  lex->sql_command=  SQLCOM_DELETE_MULTI;
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  mysql_init_select(lex);
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  lex->select_lex.select_limit= lex->unit.select_limit_cnt=
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    HA_POS_ERROR;
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  lex->auxilliary_table_list= lex->select_lex.table_list;
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  lex->select_lex.table_list.empty();
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}
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3629

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

  mysql_init_query(thd);
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  if (query_cache_send_result_to_client(thd, inBuf, length) <= 0)
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  {
    LEX *lex=lex_start(thd, (uchar*) inBuf, length);
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    if (!yyparse((void *)thd) && ! thd->is_fatal_error)
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    {
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      if (mqh_used && thd->user_connect &&
3642
	  check_mqh(thd, lex->sql_command))
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      {
	thd->net.error = 0;
      }
      else
      {
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	if (thd->net.report_error)
	  send_error(thd, 0, NullS);
	else
	{
	  mysql_execute_command(thd);
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#ifndef EMBEDDED_LIBRARY  /* TODO query cache in embedded library*/
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	  query_cache_end_of_result(&thd->net);
3655
#endif
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	}
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      }
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    }
    else
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    {
      DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
3662
			 thd->is_fatal_error));
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#ifndef EMBEDDED_LIBRARY   /* TODO query cache in embedded library*/
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      query_cache_abort(&thd->net);
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#endif
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    }
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    thd->proc_info="freeing items";
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    free_items(thd->free_list);  /* Free strings used by items */
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    lex_end(lex);
  }
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  DBUG_VOID_RETURN;
}


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

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

  if (strlen(field_name) > NAME_LEN)
  {
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    net_printf(thd, ER_TOO_LONG_IDENT, field_name); /* purecov: inspected */
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    DBUG_RETURN(1);				/* purecov: inspected */
  }
  if (type_modifier & PRI_KEY_FLAG)
  {
    lex->col_list.push_back(new key_part_spec(field_name,0));
3701
    lex->key_list.push_back(new Key(Key::PRIMARY, NullS, HA_KEY_ALG_UNDEF,
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				    lex->col_list));
    lex->col_list.empty();
  }
  if (type_modifier & (UNIQUE_FLAG | UNIQUE_KEY_FLAG))
  {
    lex->col_list.push_back(new key_part_spec(field_name,0));
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    lex->key_list.push_back(new Key(Key::UNIQUE, NullS, HA_KEY_ALG_UNDEF,
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				    lex->col_list));
    lex->col_list.empty();
  }

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  if (default_value)
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  {
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    if (default_value->type() == Item::NULL_ITEM)
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    {
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      default_value=0;
      if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) ==
	  NOT_NULL_FLAG)
      {
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	net_printf(thd,ER_INVALID_DEFAULT,field_name);
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	DBUG_RETURN(1);
      }
    }
    else if (type_modifier & AUTO_INCREMENT_FLAG)
    {
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      net_printf(thd, ER_INVALID_DEFAULT, field_name);
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      DBUG_RETURN(1);
    }
  }
  if (!(new_field=new create_field()))
    DBUG_RETURN(1);
  new_field->field=0;
  new_field->field_name=field_name;
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  new_field->def= default_value;
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  new_field->flags= type_modifier;
  new_field->unireg_check= (type_modifier & AUTO_INCREMENT_FLAG ?
			    Field::NEXT_NUMBER : Field::NONE);
  new_field->decimals= decimals ? (uint) set_zone(atoi(decimals),0,
						  NOT_FIXED_DEC-1) : 0;
  new_field->sql_type=type;
  new_field->length=0;
  new_field->change=change;
  new_field->interval=0;
  new_field->pack_length=0;
3746
  new_field->charset=cs;
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  new_field->geom_type= (Field::geometry_type) uint_geom_type;
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3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759
  if (!comment)
  {
    new_field->comment.str=0;
    new_field->comment.length=0;
  }
  else
  {
    /* In this case comment is always of type Item_string */
    new_field->comment.str=   (char*) comment->str_value.ptr();
    new_field->comment.length=comment->str_value.length();
  }
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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 &&
3765
      new_field->length < new_field->decimals+1 &&
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      new_field->decimals != NOT_FIXED_DEC)
3767
    new_field->length=new_field->decimals+1; /* purecov: inspected */
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  switch (type) {
  case FIELD_TYPE_TINY:
    if (!length) new_field->length=3+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_SHORT:
    if (!length) new_field->length=5+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_INT24:
    if (!length) new_field->length=8+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_LONG:
    if (!length) new_field->length=10+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_LONGLONG:
    if (!length) new_field->length=20;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_NULL:
    break;
  case FIELD_TYPE_DECIMAL:
    if (!length)
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      new_field->length= 10;			// Default length for DECIMAL
    if (new_field->length < MAX_FIELD_WIDTH)	// Skip wrong argument
    {
      new_field->length+=sign_len;
      if (new_field->decimals)
	new_field->length++;
    }
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    break;
3802 3803
  case FIELD_TYPE_STRING:
  case FIELD_TYPE_VAR_STRING:
3804
    if (new_field->length <= MAX_FIELD_CHARLENGTH || default_value)
3805 3806 3807 3808
      break;
    /* Convert long CHAR() and VARCHAR columns to TEXT or BLOB */
    new_field->sql_type= FIELD_TYPE_BLOB;
    sprintf(warn_buff, ER(ER_AUTO_CONVERT), field_name, "CHAR",
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	    (cs == &my_charset_bin) ? "BLOB" : "TEXT");
3810 3811 3812
    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_AUTO_CONVERT,
		 warn_buff);
    /* fall through */
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  case FIELD_TYPE_BLOB:
  case FIELD_TYPE_TINY_BLOB:
  case FIELD_TYPE_LONG_BLOB:
  case FIELD_TYPE_MEDIUM_BLOB:
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  case FIELD_TYPE_GEOMETRY:
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    if (new_field->length)
    {
      /* The user has given a length to the blob column */
      if (new_field->length < 256)
	type= FIELD_TYPE_TINY_BLOB;
      if (new_field->length < 65536)
	type= FIELD_TYPE_BLOB;
      else if (new_field->length < 256L*256L*256L)
	type= FIELD_TYPE_MEDIUM_BLOB;
      else
	type= FIELD_TYPE_LONG_BLOB;
      new_field->length= 0;
    }
    new_field->sql_type= type;
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    if (default_value)				// Allow empty as default value
    {
      String str,*res;
      res=default_value->val_str(&str);
      if (res->length())
      {
3838
	net_printf(thd,ER_BLOB_CANT_HAVE_DEFAULT,field_name); /* purecov: inspected */
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	DBUG_RETURN(1); /* purecov: inspected */
      }
      new_field->def=0;
    }
    new_field->flags|=BLOB_FLAG;
    break;
  case FIELD_TYPE_YEAR:
    if (!length || new_field->length != 2)
      new_field->length=4;			// Default length
    new_field->flags|= ZEROFILL_FLAG | UNSIGNED_FLAG;
    break;
  case FIELD_TYPE_FLOAT:
    /* change FLOAT(precision) to FLOAT or DOUBLE */
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    if (length && !decimals)
    {
      uint tmp_length=new_field->length;
      if (tmp_length > PRECISION_FOR_DOUBLE)
      {
3858
	net_printf(thd,ER_WRONG_FIELD_SPEC,field_name);
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	DBUG_RETURN(1);
      }
      else if (tmp_length > PRECISION_FOR_FLOAT)
      {
	new_field->sql_type=FIELD_TYPE_DOUBLE;
	new_field->length=DBL_DIG+7;			// -[digits].E+###
      }
      else
	new_field->length=FLT_DIG+6;			// -[digits].E+##
      new_field->decimals= NOT_FIXED_DEC;
      break;
    }
    if (!length)
    {
      new_field->length =  FLT_DIG+6;
      new_field->decimals= NOT_FIXED_DEC;
    }
    break;
  case FIELD_TYPE_DOUBLE:
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    if (!length)
    {
      new_field->length = DBL_DIG+7;
      new_field->decimals=NOT_FIXED_DEC;
    }
    break;
  case FIELD_TYPE_TIMESTAMP:
    if (!length)
      new_field->length= 14;			// Full date YYYYMMDDHHMMSS
    else
    {
      new_field->length=((new_field->length+1)/2)*2; /* purecov: inspected */
      new_field->length= min(new_field->length,14); /* purecov: inspected */
    }
    new_field->flags|= ZEROFILL_FLAG | UNSIGNED_FLAG | NOT_NULL_FLAG;
    break;
  case FIELD_TYPE_DATE:				// Old date type
    if (protocol_version != PROTOCOL_VERSION-1)
      new_field->sql_type=FIELD_TYPE_NEWDATE;
    /* fall trough */
  case FIELD_TYPE_NEWDATE:
    new_field->length=10;
    break;
  case FIELD_TYPE_TIME:
    new_field->length=10;
    break;
  case FIELD_TYPE_DATETIME:
    new_field->length=19;
    break;
  case FIELD_TYPE_SET:
    {
      if (interval->count > sizeof(longlong)*8)
      {
3912
	net_printf(thd,ER_TOO_BIG_SET,field_name); /* purecov: inspected */
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	DBUG_RETURN(1);				/* purecov: inspected */
      }
      new_field->pack_length=(interval->count+7)/8;
      if (new_field->pack_length > 4)
	new_field->pack_length=8;
      new_field->interval=interval;
      new_field->length=0;
      for (const char **pos=interval->type_names; *pos ; pos++)
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      {
	new_field->length+=(uint) strip_sp((char*) *pos)+1;
      }
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      new_field->length--;
      set_if_smaller(new_field->length,MAX_FIELD_WIDTH-1);
      if (default_value)
      {
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	char *not_used;
	uint not_used2;
3930
  bool not_used3;
3931

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	thd->cuted_fields=0;
	String str,*res;
	res=default_value->val_str(&str);
3935
	(void) find_set(interval, res->ptr(), res->length(), &not_used,
3936
			&not_used2, &not_used3);
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	if (thd->cuted_fields)
	{
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	  net_printf(thd,ER_INVALID_DEFAULT,field_name);
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	  DBUG_RETURN(1);
	}
      }
    }
    break;
  case FIELD_TYPE_ENUM:
    {
      new_field->interval=interval;
      new_field->pack_length=interval->count < 256 ? 1 : 2; // Should be safe
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      new_field->length=(uint) strip_sp((char*) interval->type_names[0]);
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      for (const char **pos=interval->type_names+1; *pos ; pos++)
      {
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	uint length=(uint) strip_sp((char*) *pos);
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	set_if_bigger(new_field->length,length);
      }
      set_if_smaller(new_field->length,MAX_FIELD_WIDTH-1);
      if (default_value)
      {
	String str,*res;
	res=default_value->val_str(&str);
	if (!find_enum(interval,res->ptr(),res->length()))
	{
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	  net_printf(thd,ER_INVALID_DEFAULT,field_name);
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	  DBUG_RETURN(1);
	}
      }
      break;
    }
  }

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

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

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

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

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


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

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

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


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


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/*
  Add a table to list of used tables

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

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

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

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

  if (!alias)					/* Alias is case sensitive */
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  {
    if (table->sel)
    {
      net_printf(thd,ER_DERIVED_MUST_HAVE_ALIAS);
      DBUG_RETURN(0);
    }
4122
    if (!(alias_str=thd->memdup(alias_str,table->table.length+1)))
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      DBUG_RETURN(0);
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  }
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  if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
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    DBUG_RETURN(0);				/* purecov: inspected */
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  if (table->db.str)
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  {
    ptr->db= table->db.str;
    ptr->db_length= table->db.length;
  }
  else if (thd->db)
  {
    ptr->db= thd->db;
    ptr->db_length= thd->db_length;
  }
  else
  {
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    /* The following can't be "" as we may do 'casedn_str()' on it */
    ptr->db= empty_c_string;
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    ptr->db_length= 0;
  }
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  ptr->alias= alias_str;
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  if (lower_case_table_names && table->table.length)
    my_casedn_str(files_charset_info, table->table.str);
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  ptr->real_name=table->table.str;
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  ptr->real_name_length=table->table.length;
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  ptr->lock_type=   lock_type;
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  ptr->updating=    test(table_options & TL_OPTION_UPDATING);
  ptr->force_index= test(table_options & TL_OPTION_FORCE_INDEX);
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  ptr->ignore_leaves= test(table_options & TL_OPTION_IGNORE_LEAVES);
4153
  ptr->derived=	    table->sel;
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  if (use_index)
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    ptr->use_index=(List<String> *) thd->memdup((gptr) use_index,
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					       sizeof(*use_index));
  if (ignore_index)
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    ptr->ignore_index=(List<String> *) thd->memdup((gptr) ignore_index,
						   sizeof(*ignore_index));
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  /* check that used name is unique */
4162
  if (lock_type != TL_IGNORE)
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  {
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    for (TABLE_LIST *tables=(TABLE_LIST*) table_list.first ;
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	 tables ;
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	 tables=tables->next)
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    {
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      if (!strcmp(alias_str,tables->alias) && !strcmp(ptr->db, tables->db))
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      {
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	net_printf(thd,ER_NONUNIQ_TABLE,alias_str); /* purecov: tested */
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	DBUG_RETURN(0);				/* purecov: tested */
      }
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    }
  }
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  table_list.link_in_list((byte*) ptr, (byte**) &ptr->next);
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  DBUG_RETURN(ptr);
}

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/*
  Set lock for all tables in current select level

  SYNOPSIS:
    set_lock_for_tables()
    lock_type			Lock to set for tables

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

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

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

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


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

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

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

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

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/*
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  Reload/resets privileges and the different caches.

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

  RETURN
    0	 ok
    !=0  error
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*/

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bool reload_acl_and_cache(THD *thd, ulong options, TABLE_LIST *tables,
                          bool *write_to_binlog)
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{
  bool result=0;
  select_errors=0;				/* Write if more errors */
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  bool tmp_write_to_binlog= 1;
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  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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    /* 
     Writing this command to the binlog may result in infinite loops when doing
     mysqlbinlog|mysql, and anyway it does not really make sense to log it
     automatically (would cause more trouble to users than it would help them)
    */
    tmp_write_to_binlog= 0;
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    mysql_log.new_file(1);
    mysql_update_log.new_file(1);
    mysql_bin_log.new_file(1);
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#ifdef HAVE_REPLICATION
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    if (expire_logs_days)
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    {
      long purge_time= time(0) - expire_logs_days*24*60*60;
      if (purge_time >= 0)
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	mysql_bin_log.purge_logs_before_date(purge_time);
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    }
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#endif
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    mysql_slow_log.new_file(1);
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    if (ha_flush_logs())
      result=1;
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    if (flush_error_log())
      result=1;
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  }
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#ifdef HAVE_QUERY_CACHE
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  if (options & REFRESH_QUERY_CACHE_FREE)
  {
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    query_cache.pack();				// FLUSH QUERY CACHE
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    options &= ~REFRESH_QUERY_CACHE; //don't flush all cache, just free memory
  }
  if (options & (REFRESH_TABLES | REFRESH_QUERY_CACHE))
  {
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    query_cache.flush();			// RESET QUERY CACHE
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  }
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#endif /*HAVE_QUERY_CACHE*/
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  /*
    Note that if REFRESH_READ_LOCK bit is set then REFRESH_TABLES is set too
    (see sql_yacc.yy)
  */
  if (options & (REFRESH_TABLES | REFRESH_READ_LOCK)) 
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  {
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    if ((options & REFRESH_READ_LOCK) && thd)
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    {
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      // writing to the binlog could cause deadlocks, as we don't log UNLOCK TABLES
      tmp_write_to_binlog= 0;
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      if (lock_global_read_lock(thd))
	return 1;
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    }
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    result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1, tables);
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  }
  if (options & REFRESH_HOSTS)
    hostname_cache_refresh();
  if (options & REFRESH_STATUS)
    refresh_status();
  if (options & REFRESH_THREADS)
    flush_thread_cache();
4341
#ifndef EMBEDDED_LIBRARY
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  if (options & REFRESH_MASTER)
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  {
    tmp_write_to_binlog= 0;
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    if (reset_master(thd))
      result=1;
4347
  }
4348
#endif
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#ifdef OPENSSL
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   if (options & REFRESH_DES_KEY_FILE)
   {
     if (des_key_file)
       result=load_des_key_file(des_key_file);
   }
#endif
4356
#ifndef EMBEDDED_LIBRARY
4357 4358
 if (options & REFRESH_SLAVE)
 {
4359
   tmp_write_to_binlog= 0;
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   LOCK_ACTIVE_MI;
4361
   if (reset_slave(thd, active_mi))
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     result=1;
   UNLOCK_ACTIVE_MI;
 }
4365
#endif
4366
 if (options & REFRESH_USER_RESOURCES)
4367
   reset_mqh(thd,(LEX_USER *) NULL);
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 if (write_to_binlog)
   *write_to_binlog= tmp_write_to_binlog;
4370
 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
*/

4386
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)
4415
    send_ok(thd);
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  else
4417
    net_printf(thd,error,id);
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}

/* Clear most status variables */

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

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static bool append_file_to_dir(THD *thd, char **filename_ptr, char *table_name)
4439
{
4440
  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);
4453
  end=convert_dirname(buff, *filename_ptr, NullS);
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  if (!(ptr=thd->alloc((uint) (end-buff)+(uint) strlen(table_name)+1)))
4455 4456
    return 1;					// End of memory
  *filename_ptr=ptr;
4457
  strxmov(ptr,buff,table_name,NullS);
4458 4459
  return 0;
}
4460

4461

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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;
4476
  if (thd->lex.current_select != &thd->lex.select_lex)
4477 4478 4479 4480
  {
    char command[80];
    strmake(command, thd->lex.yylval->symbol.str,
	    min(thd->lex.yylval->symbol.length, sizeof(command)-1));
4481
    net_printf(thd, ER_CANT_USE_OPTION_HERE, command);
4482 4483 4484 4485
    return 1;
  }
  return 0;
}
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compare_func_creator comp_eq_creator(bool invert)
{
  return invert?&Item_bool_func2::ne_creator:&Item_bool_func2::eq_creator;
}

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

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

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

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

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