sql_parse.cc 106 KB
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/* Copyright (C) 2000-2003 MySQL AB
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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

#include "mysql_priv.h"
#include "sql_acl.h"
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#include "sql_repl.h"
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#include "repl_failsafe.h"
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#include <m_ctype.h>
#include <myisam.h>
#include <my_dir.h>
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#include <assert.h>
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#ifdef HAVE_INNOBASE_DB
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#include "ha_innodb.h"
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#endif

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

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#define MEM_ROOT_BLOCK_SIZE       8192
#define MEM_ROOT_PREALLOC         8192
#define TRANS_MEM_ROOT_BLOCK_SIZE 4096
#define TRANS_MEM_ROOT_PREALLOC   4096
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extern int yyparse(void);
extern "C" pthread_mutex_t THR_LOCK_keycache;
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#ifdef SOLARIS
extern "C" int gethostname(char *name, int namelen);
#endif
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static int check_for_max_user_connections(USER_CONN *uc);
static void decrease_user_connections(USER_CONN *uc);
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static bool check_db_used(THD *thd,TABLE_LIST *tables);
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static bool check_merge_table_access(THD *thd, char *db, TABLE_LIST *tables);
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static bool check_dup(const char *db, const char *name, TABLE_LIST *tables);
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static void mysql_init_query(THD *thd);
static void remove_escape(char *name);
static void refresh_status(void);
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static bool append_file_to_dir(THD *thd, char **filename_ptr,
			       char *table_name);
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static bool create_total_list(THD *thd, LEX *lex, TABLE_LIST **result);
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const char *any_db="*any*";	// Special symbol for check_access
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const char *command_name[]={
  "Sleep", "Quit", "Init DB", "Query", "Field List", "Create DB",
  "Drop DB", "Refresh", "Shutdown", "Statistics", "Processlist",
  "Connect","Kill","Debug","Ping","Time","Delayed_insert","Change user",
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  "Binlog Dump","Table Dump",  "Connect Out", "Register Slave",
  "Error"					// Last command number
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};

bool volatile abort_slave = 0;

#ifdef __WIN__
static void  test_signal(int sig_ptr)
{
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#if !defined( DBUG_OFF)
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  MessageBox(NULL,"Test signal","DBUG",MB_OK);
#endif
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#if defined(OS2)
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  fprintf(stderr, "Test signal %d\n", sig_ptr);
  fflush(stderr);
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#endif
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}
static void init_signals(void)
{
  int signals[7] = {SIGINT,SIGILL,SIGFPE,SIGSEGV,SIGTERM,SIGBREAK,SIGABRT } ;
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  for (int i=0 ; i < 7 ; i++)
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    signal( signals[i], test_signal) ;
}
#endif

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

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


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static HASH hash_user_connections;
extern  pthread_mutex_t LOCK_user_conn;

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

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

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  user_len=strlen(user);
  host_len=strlen(host);
  temp_len= (strmov(strmov(temp_user, user)+1, host) - temp_user)+1;
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  (void) pthread_mutex_lock(&LOCK_user_conn);
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  if (!(uc = (struct  user_conn *) hash_search(&hash_user_connections,
					       (byte*) temp_user, temp_len)))
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  {
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    /* First connection for user; Create a user connection object */
    if (!(uc= ((struct user_conn*)
	       my_malloc(sizeof(struct user_conn) + temp_len+1,
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			 MYF(MY_WME)))))
    {
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      send_error(&current_thd->net, 0, NullS);	// Out of memory
      return_val=1;
      goto end;
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    }
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    uc->user=(char*) (uc+1);
    memcpy(uc->user,temp_user,temp_len+1);
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    uc->user_len= user_len;
    uc->host=uc->user + uc->user_len +  1;
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    uc->len = temp_len;
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    uc->connections = 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);
      send_error(&current_thd->net, 0, NullS);	// Out of memory
      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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  Check if user is ok
  Updates:
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  thd->{user,master_access,priv_user,priv_host,db,db_access}
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*/

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

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  if (!(thd->user = my_strdup(user, MYF(0))))
  {
    send_error(net,ER_OUT_OF_RESOURCES);
    return 1;
  }
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  thd->master_access=acl_getroot(thd, thd->host, thd->ip, thd->user,
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				 passwd, thd->scramble,
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                                 &thd->priv_user, thd->priv_host,
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				 protocol_version == 9 ||
				 !(thd->client_capabilities &
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				   CLIENT_LONG_PASSWORD),&ur);
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  DBUG_PRINT("info",
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	     ("Capabilities: %d  packet_length: %ld  Host: '%s'  Login user: '%s'  Priv_user: '%s'  Using password: %s  Access: %u  db: '%s'",
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	      thd->client_capabilities, thd->max_client_packet_length,
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	      thd->host_or_ip, thd->user, thd->priv_user,
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	      passwd[0] ? "yes": "no",
	      thd->master_access, thd->db ? thd->db : "*none*"));
  if (thd->master_access & NO_ACCESS)
  {
    net_printf(net, ER_ACCESS_DENIED_ERROR,
	       thd->user,
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	       thd->host_or_ip,
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	       passwd[0] ? ER(ER_YES) : ER(ER_NO));
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    mysql_log.write(thd,COM_CONNECT,ER(ER_ACCESS_DENIED_ERROR),
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		    thd->user,
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		    thd->host_or_ip,
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		    passwd[0] ? ER(ER_YES) : ER(ER_NO));
    return(1);					// Error already given
  }
  if (check_count)
  {
    VOID(pthread_mutex_lock(&LOCK_thread_count));
    bool tmp=(thread_count - delayed_insert_threads >= max_connections &&
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	      !(thd->master_access & SUPER_ACL));
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    VOID(pthread_mutex_unlock(&LOCK_thread_count));
    if (tmp)
    {						// Too many connections
      send_error(net, ER_CON_COUNT_ERROR);
      return(1);
    }
  }
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  mysql_log.write(thd,command,
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		  (thd->priv_user == thd->user ?
		   (char*) "%s@%s on %s" :
		   (char*) "%s@%s as anonymous on %s"),
		  user,
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		  thd->host_or_ip,
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		  db ? db : (char*) "");
  thd->db_access=0;
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  /* Don't allow user to connect if he has done too many queries */
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  if ((ur.questions || ur.updates || ur.connections) &&
      get_or_create_user_conn(thd,user,thd->host_or_ip,&ur))
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    return -1;
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  if (thd->user_connect && thd->user_connect->user_resources.connections && 
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      check_for_max_user_connections(thd->user_connect))
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    return -1;
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  if (db && db[0])
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  {
    bool error=test(mysql_change_db(thd,db));
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    if (error && thd->user_connect)
      decrease_user_connections(thd->user_connect);
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    return error;
  }
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  else
    send_ok(net);				// Ready to handle questions
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  thd->password= test(passwd[0]);		// Remember for error messages
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  return 0;					// ok
}

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

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

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

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


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static int check_for_max_user_connections(USER_CONN *uc)
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{
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  int error=0;
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  DBUG_ENTER("check_for_max_user_connections");
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  if (max_user_connections &&
      (max_user_connections <=  (uint) uc->connections))
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  {
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    net_printf(&(current_thd->net),ER_TOO_MANY_USER_CONNECTIONS, uc->user);
    error=1;
    goto end;
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  }
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  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(&current_thd->net, ER_USER_LIMIT_REACHED, uc->user,
	       "max_connections",
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	       (long) uc->user_resources.connections);
    error=1;
    goto end;
  }
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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;
  uc_update_queries[SQLCOM_MULTI_UPDATE]=1;
}


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/*
  Check if maximum queries per hour limit has been reached
  returns 0 if OK.
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  In theory we would need a mutex in the USER_CONN structure for this to
  be 100 % safe, but as the worst scenario is that we would miss counting
  a couple of queries, this isn't critical.
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*/

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

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

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

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

static int
check_connections(THD *thd)
{
  uint connect_errors=0;
  NET *net= &thd->net;
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  /* Store the connection details */
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  DBUG_PRINT("info", (("check_connections called by thread %d"),
	     thd->thread_id));
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  DBUG_PRINT("info",("New connection received on %s",
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			vio_description(net->vio)));
  if (!thd->host)                           // If TCP/IP connection
  {
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    char ip[30];
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    if (vio_peer_addr(net->vio, ip, &thd->peer_port))
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      return (ER_BAD_HOST_ERROR);
    if (!(thd->ip = my_strdup(ip,MYF(0))))
      return (ER_OUT_OF_RESOURCES);
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    thd->host_or_ip=thd->ip;
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#if !defined(HAVE_SYS_UN_H) || defined(HAVE_mit_thread)
    /* Fast local hostname resolve for Win32 */
    if (!strcmp(thd->ip,"127.0.0.1"))
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      thd->host=(char*) localhost;
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    else
#endif
    if (!(specialflag & SPECIAL_NO_RESOLVE))
    {
      vio_in_addr(net->vio,&thd->remote.sin_addr);
      thd->host=ip_to_hostname(&thd->remote.sin_addr,&connect_errors);
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      /* Cut very long hostnames to avoid possible overflows */
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      if (thd->host)
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      {
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	thd->host[min(strlen(thd->host), HOSTNAME_LENGTH)]= 0;
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	thd->host_or_ip= thd->host;
      }
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      if (connect_errors > max_connect_errors)
	return(ER_HOST_IS_BLOCKED);
    }
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    DBUG_PRINT("info",("Host: %s  ip: %s",
		       thd->host ? thd->host : "unknown host",
		       thd->ip ? thd->ip : "unknown ip"));
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    if (acl_check_host(thd->host,thd->ip))
      return(ER_HOST_NOT_PRIVILEGED);
  }
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  else /* Hostname given means that the connection was on a socket */
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  {
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    DBUG_PRINT("info",("Host: %s",thd->host));
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    thd->host_or_ip= thd->host;
    thd->ip= 0;
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    bzero((char*) &thd->remote,sizeof(struct sockaddr));
  }
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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 */
    char buff[SERVER_VERSION_LENGTH + SCRAMBLE_LENGTH+32],*end;
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    int client_flags = CLIENT_LONG_FLAG | CLIENT_CONNECT_WITH_DB;
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    if (opt_using_transactions)
      client_flags|=CLIENT_TRANSACTIONS;
#ifdef HAVE_COMPRESS
    client_flags |= CLIENT_COMPRESS;
#endif /* HAVE_COMPRESS */
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#ifdef HAVE_OPENSSL
    if (ssl_acceptor_fd)
      client_flags |= CLIENT_SSL;       /* Wow, SSL is avalaible! */
#endif /* HAVE_OPENSSL */
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    end=strnmov(buff,server_version,SERVER_VERSION_LENGTH)+1;
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    int4store((uchar*) end,thd->thread_id);
    end+=4;
    memcpy(end,thd->scramble,SCRAMBLE_LENGTH+1);
    end+=SCRAMBLE_LENGTH +1;
    int2store(end,client_flags);
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    end[2]=(char) MY_CHARSET_CURRENT;
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    int2store(end+3,thd->server_status);
    bzero(end+5,13);
    end+=18;
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    if (net_write_command(net,(uchar) protocol_version, buff,
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			  (uint) (end-buff)) ||
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       (pkt_len= my_net_read(net)) == packet_error ||
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	pkt_len < MIN_HANDSHAKE_SIZE)
    {
      inc_host_errors(&thd->remote.sin_addr);
      return(ER_HANDSHAKE_ERROR);
    }
  }
#ifdef _CUSTOMCONFIG_
#include "_cust_sql_parse.h"
#endif
  if (connect_errors)
    reset_host_errors(&thd->remote.sin_addr);
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  if (thd->packet.alloc(thd->variables.net_buffer_length))
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    return(ER_OUT_OF_RESOURCES);

  thd->client_capabilities=uint2korr(net->read_pos);
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  if (thd->client_capabilities & CLIENT_IGNORE_SPACE)
    thd->sql_mode|= MODE_IGNORE_SPACE;
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#ifdef HAVE_OPENSSL
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  DBUG_PRINT("info", ("client capabilities: %d", thd->client_capabilities));
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  if (thd->client_capabilities & CLIENT_SSL)
  {
    /* Do the SSL layering. */
    DBUG_PRINT("info", ("IO layer change in progress..."));
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    if (sslaccept(ssl_acceptor_fd, net->vio, thd->variables.net_wait_timeout))
    {
      DBUG_PRINT("error", ("Failed to read user information (pkt_len= %lu)",
			   pkt_len));
      inc_host_errors(&thd->remote.sin_addr);
      return(ER_HANDSHAKE_ERROR);    
    }
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    DBUG_PRINT("info", ("Reading user information over SSL layer"));
    if ((pkt_len=my_net_read(net)) == packet_error ||
	pkt_len < NORMAL_HANDSHAKE_SIZE)
    {
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      DBUG_PRINT("error", ("Failed to read user information (pkt_len= %lu)",
			   pkt_len));
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      inc_host_errors(&thd->remote.sin_addr);
      return(ER_HANDSHAKE_ERROR);
    }
  }
  else
  {
    DBUG_PRINT("info", ("Leaving IO layer intact"));
    if (pkt_len < NORMAL_HANDSHAKE_SIZE)
    {
      inc_host_errors(&thd->remote.sin_addr);
      return ER_HANDSHAKE_ERROR;
    }
  }
#endif

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


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

  pthread_detach_this_thread();

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

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

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

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

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

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

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

  pthread_detach_this_thread();
  thd->thread_stack= (char*) &thd;
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#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__)
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  sigset_t set;
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  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
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#endif

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  if (thd->variables.max_join_size == HA_POS_ERROR)
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    thd->options |= OPTION_BIG_SELECTS;

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


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

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

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  if (!db || check_db_name(db))
  {
    net_printf(&thd->net,ER_WRONG_DB_NAME, db ? db : "NULL");
    goto err;
  }
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  if (lower_case_table_names)
    casedn_str(tbl_name);
  remove_escape(tbl_name);

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

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

  thd->free_list = 0;
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  thd->query_length=(uint) strlen(tbl_name);
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  thd->query = tbl_name;
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  if ((error = mysqld_dump_create_info(thd, table, -1)))
  {
    my_error(ER_GET_ERRNO, MYF(0));
    goto err;
  }
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  net_flush(&thd->net);
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  if ((error= table->file->dump(thd,fd)))
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    my_error(ER_GET_ERRNO, MYF(0));
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err:
  close_thread_tables(thd);
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  DBUG_RETURN(error);
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}


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

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

  net= &thd->net;
  thd->current_tablenr=0;

  packet=0;
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  old_timeout=net->read_timeout;
  // Wait max for 8 hours
  net->read_timeout=(uint) thd->variables.net_wait_timeout;
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  net->last_error[0]=0;				// Clear error message
  net->last_errno=0;

  net_new_transaction(net);
  if ((packet_length=my_net_read(net)) == packet_error)
  {
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    DBUG_PRINT("info",("Got error %d reading command from socket %s",
		       net->error,
		       vio_description(net->vio)));
    /* Check if we can continue without closing the connection */
    if (net->error != 3)
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    {
      statistic_increment(aborted_threads,&LOCK_status);
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      DBUG_RETURN(TRUE);			// We have to close it.
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    }
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    send_error(net,net->last_errno,NullS);
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    net->error= 0;
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    DBUG_RETURN(FALSE);
  }
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  else
  {
    packet=(char*) net->read_pos;
    command = (enum enum_server_command) (uchar) packet[0];
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    if (command >= COM_END)
      command= COM_END;				// Wrong command
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    DBUG_PRINT("info",("Command on %s = %d (%s)",
		       vio_description(net->vio), command,
		       command_name[command]));
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  }
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  net->read_timeout=old_timeout;		// restore it
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  DBUG_RETURN(dispatch_command(command,thd, packet+1, (uint) packet_length));
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}


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

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  thd->command=command;
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  thd->set_time();
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  VOID(pthread_mutex_lock(&LOCK_thread_count));
  thd->query_id=query_id;
  if (command != COM_STATISTICS && command != COM_PING)
    query_id++;
  thread_running++;
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
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  thd->lex.select_lex.options=0;		// We store status here
957
  switch (command) {
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  case COM_INIT_DB:
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    statistic_increment(com_stat[SQLCOM_CHANGE_DB],&LOCK_status);
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    if (!mysql_change_db(thd,packet))
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      mysql_log.write(thd,command,"%s",thd->db);
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    break;
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  case COM_REGISTER_SLAVE:
  {
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    if (!register_slave(thd, (uchar*)packet, packet_length))
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      send_ok(&thd->net);
    break;
  }
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  case COM_TABLE_DUMP:
    {
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      statistic_increment(com_other, &LOCK_status);
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      slow_command = TRUE;
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      uint db_len = *(uchar*)packet;
      uint tbl_len = *(uchar*)(packet + db_len + 1);
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      char* db = thd->alloc(db_len + tbl_len + 2);
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      memcpy(db, packet + 1, db_len);
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      char* tbl_name = db + db_len;
      *tbl_name++ = 0;
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      memcpy(tbl_name, packet + db_len + 2, tbl_len);
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      tbl_name[tbl_len] = 0;
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      if (mysql_table_dump(thd, db, tbl_name, -1))
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	send_error(&thd->net); // dump to NET
      break;
    }
  case COM_CHANGE_USER:
  {
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    thd->change_user();
    clear_error_message(thd);			// If errors from rollback

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

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

  case COM_QUERY:
  {
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    packet_length--;				// Remove end null
    /* Remove garage at start and end of query */
    while (isspace(packet[0]) && packet_length > 0)
    {
      packet++;
      packet_length--;
    }
    char *pos=packet+packet_length;		// Point at end null
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    while (packet_length > 0 && (pos[-1] == ';' || isspace(pos[-1])))
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    {
      pos--;
      packet_length--;
    }
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    /* We must allocate some extra memory for query cache */
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    if (!(thd->query= (char*) thd->memdup_w_gap((gptr) (packet),
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						packet_length,
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						thd->db_length+2+
						sizeof(ha_rows))))
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      break;
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    thd->query[packet_length]=0;
1050
    thd->packet.shrink(thd->variables.net_buffer_length);// Reclaim some memory
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    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),QUERY_PRIOR);
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    mysql_log.write(thd,command,"%s",thd->query);
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    DBUG_PRINT("query",("%-.4096s",thd->query));
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    /* thd->query_length is set by mysql_parse() */
    mysql_parse(thd,thd->query,packet_length);
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    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),WAIT_PRIOR);
    DBUG_PRINT("info",("query ready"));
    break;
  }
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  case COM_FIELD_LIST:				// This isn't actually needed
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#ifdef DONT_ALLOW_SHOW_COMMANDS
    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
    break;
#else
  {
    char *fields;
    TABLE_LIST table_list;
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    statistic_increment(com_stat[SQLCOM_SHOW_FIELDS],&LOCK_status);
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    bzero((char*) &table_list,sizeof(table_list));
    if (!(table_list.db=thd->db))
    {
      send_error(net,ER_NO_DB_ERROR);
      break;
    }
    thd->free_list=0;
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    table_list.alias= table_list.real_name= thd->strdup(packet);
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    packet=strend(packet)+1;
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    // command not cachable => no gap for data base name
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    if (!(thd->query=fields=thd->memdup(packet,thd->query_length+1)))
      break;
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    mysql_log.write(thd,command,"%s %s",table_list.real_name,fields);
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    if (lower_case_table_names)
      casedn_str(table_list.real_name);
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    remove_escape(table_list.real_name);	// This can't have wildcards

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

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  case COM_CREATE_DB:				// QQ: To be removed
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    {
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      statistic_increment(com_stat[SQLCOM_CREATE_DB],&LOCK_status);
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      char *db=thd->strdup(packet);
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      // null test to handle EOM
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      if (!db || !strip_sp(db) || check_db_name(db))
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      {
	net_printf(&thd->net,ER_WRONG_DB_NAME, db ? db : "NULL");
	break;
      }
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      if (check_access(thd,CREATE_ACL,db,0,1))
	break;
1117
      mysql_log.write(thd,command,packet);
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      mysql_create_db(thd,db,0,0);
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      break;
    }
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  case COM_DROP_DB:				// QQ: To be removed
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    {
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      statistic_increment(com_stat[SQLCOM_DROP_DB],&LOCK_status);
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      char *db=thd->strdup(packet);
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      // null test to handle EOM
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      if (!db || !strip_sp(db) || check_db_name(db))
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      {
	net_printf(&thd->net,ER_WRONG_DB_NAME, db ? db : "NULL");
	break;
      }
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      if (check_access(thd,DROP_ACL,db,0,1))
	break;
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      if (thd->locked_tables || thd->active_transaction())
      {
	send_error(&thd->net,ER_LOCK_OR_ACTIVE_TRANSACTION);
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	break;
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      }
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      mysql_log.write(thd,command,db);
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      mysql_rm_db(thd,db,0,0);
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      break;
    }
  case COM_BINLOG_DUMP:
    {
1144
      statistic_increment(com_other,&LOCK_status);
1145
      slow_command = TRUE;
1146
      if (check_global_access(thd, REPL_SLAVE_ACL))
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	break;
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      mysql_log.write(thd,command, 0);
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      ulong pos;
      ushort flags;
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      uint32 slave_server_id;
1153
      /* TODO: The following has to be changed to an 8 byte integer */
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      pos = uint4korr(packet);
      flags = uint2korr(packet + 4);
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      thd->server_id=0; /* avoid suicide */
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      kill_zombie_dump_threads(slave_server_id = uint4korr(packet+6));
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      thd->server_id = slave_server_id;
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      mysql_binlog_send(thd, thd->strdup(packet + 10), (my_off_t) pos, flags);
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      unregister_slave(thd,1,1);
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      // fake COM_QUIT -- if we get here, the thread needs to terminate
      error = TRUE;
      net->error = 0;
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      break;
    }
  case COM_REFRESH:
    {
1168
      statistic_increment(com_stat[SQLCOM_FLUSH],&LOCK_status);
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      ulong options= (ulong) (uchar) packet[0];
1170
      if (check_global_access(thd,RELOAD_ACL))
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	break;
1172
      mysql_log.write(thd,command,NullS);
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      /* error sending is deferred to reload_acl_and_cache */
      reload_acl_and_cache(thd, options, (TABLE_LIST*) 0) ;
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      break;
    }
  case COM_SHUTDOWN:
1178
    statistic_increment(com_other,&LOCK_status);
1179
    if (check_global_access(thd,SHUTDOWN_ACL))
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      break; /* purecov: inspected */
    DBUG_PRINT("quit",("Got shutdown command"));
1182
    mysql_log.write(thd,command,NullS);
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    send_eof(net);
#ifdef __WIN__
    sleep(1);					// must wait after eof()
#endif
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#ifndef OS2
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    send_eof(net);				// This is for 'quit request'
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#endif
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    close_connection(net);
    close_thread_tables(thd);			// Free before kill
1192
    free_root(&thd->mem_root,MYF(0));
1193
    free_root(&thd->transaction.mem_root,MYF(0));
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    kill_mysql();
    error=TRUE;
    break;

  case COM_STATISTICS:
  {
1200
    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];
1203
    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
1211
    if (sf_malloc_cur_memory)				// Using SAFEMALLOC
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      sprintf(strend(buff), "  Memory in use: %ldK  Max memory used: %ldK",
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	      (sf_malloc_cur_memory+1023L)/1024L,
	      (sf_malloc_max_memory+1023L)/1024L);
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 #endif
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    VOID(my_net_write(net, buff,(uint) strlen(buff)));
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    VOID(net_flush(net));
    break;
  }
  case COM_PING:
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    statistic_increment(com_other,&LOCK_status);
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    send_ok(net);				// Tell client we are alive
    break;
  case COM_PROCESS_INFO:
1225
    statistic_increment(com_stat[SQLCOM_SHOW_PROCESSLIST],&LOCK_status);
1226
    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);
1235
    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);
1241
    if (check_global_access(thd, SUPER_ACL))
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      break;					/* purecov: inspected */
    mysql_print_status(thd);
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    mysql_log.write(thd,command,NullS);
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    send_eof(net);
    break;
  case COM_SLEEP:
  case COM_CONNECT:				// Impossible here
  case COM_TIME:				// Impossible from client
  case COM_DELAYED_INSERT:
1251
  case COM_END:
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  default:
    send_error(net, ER_UNKNOWN_COM_ERROR);
    break;
  }
  if (thd->lock || thd->open_tables)
  {
    thd->proc_info="closing tables";
    close_thread_tables(thd);			/* Free tables */
  }

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

  time_t start_of_query=thd->start_time;
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  thd->end_time();				// Set start time
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1268
  /* If not reading from backup and if the query took too long */
1269
  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));
1290
  thd->packet.shrink(thd->variables.net_buffer_length);	// Reclaim some memory
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  free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
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  DBUG_RETURN(error);
}

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

void
mysql_execute_command(void)
{
  int	res=0;
  THD	*thd=current_thd;
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  LEX	*lex= &thd->lex;
1306
  TABLE_LIST *tables=(TABLE_LIST*) lex->select_lex.table_list.first;
1307
  SELECT_LEX *select_lex = lex->select;
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  DBUG_ENTER("mysql_execute_command");

1310 1311
  if (thd->slave_thread)
  {
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    /* 
      Skip if we are in the slave thread, some table rules have been
      given and the table list says the query should not be replicated
    */
    if (table_rules_on && tables && !tables_ok(thd,tables))
1317
      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;
1327
      lex->insert_list = &select_lex->item_list;
1328
    }
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#endif
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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
  */
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  if ((lex->select_lex.next && create_total_list(thd,lex,&tables)) ||
      (table_rules_on && tables && thd->slave_thread &&
       !tables_ok(thd,tables)))
1339
    DBUG_VOID_RETURN;
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  /*
    When option readonly is set deny operations which change tables.
    Except for the replication thread and the 'super' users.
  */
  if (opt_readonly &&
      !(thd->slave_thread || (thd->master_access & SUPER_ACL)) &&
      (uc_update_queries[lex->sql_command] > 0))
  {
    send_error(&thd->net,ER_CANT_UPDATE_WITH_READLOCK);
    DBUG_VOID_RETURN;
  }
1352

1353
  statistic_increment(com_stat[lex->sql_command],&LOCK_status);
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  switch (lex->sql_command) {
  case SQLCOM_SELECT:
  {
    select_result *result;
1358
    if (select_lex->options & SELECT_DESCRIBE)
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      lex->exchange=0;
    if (tables)
    {
      res=check_table_access(thd,
			     lex->exchange ? SELECT_ACL | FILE_ACL :
			     SELECT_ACL,
			     tables);
    }
    else
      res=check_access(thd, lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL,
		       any_db);
    if (res)
    {
      res=0;
      break;					// Error message is given
    }

1376 1377 1378
    thd->offset_limit=select_lex->offset_limit;
    thd->select_limit=select_lex->select_limit+select_lex->offset_limit;
    if (thd->select_limit < select_lex->select_limit)
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      thd->select_limit= HA_POS_ERROR;		// no limit
1380
    if (thd->select_limit == HA_POS_ERROR)
1381
      select_lex->options&= ~OPTION_FOUND_ROWS;
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    if (lex->exchange)
    {
      if (lex->exchange->dumpfile)
      {
	if (!(result=new select_dump(lex->exchange)))
	{
	  res= -1;
	  break;
	}
      }
      else
      {
	if (!(result=new select_export(lex->exchange)))
	{
	  res= -1;
	  break;
	}
      }
    }
    else if (!(result=new select_send()))
    {
      res= -1;
#ifdef DELETE_ITEMS
1406 1407
      delete select_lex->having;
      delete select_lex->where;
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#endif
      break;
    }
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    else
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1412
    {
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1413 1414 1415 1416
      /*
	Normal select:
	Change lock if we are using SELECT HIGH PRIORITY,
	FOR UPDATE or IN SHARE MODE
1417 1418

	TODO: Delete the following loop when locks is set by sql_yacc
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1419
      */
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      TABLE_LIST *table;
      for (table = tables ; table ; table=table->next)
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	table->lock_type= lex->lock_option;
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    }

    if (!(res=open_and_lock_tables(thd,tables)))
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1426
    {
1427
      query_cache_store_query(thd, tables);
1428
      res=handle_select(thd, lex, result);
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    }
1430 1431
    else
      delete result;
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    break;
  }
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  case SQLCOM_DO:
    res=mysql_do(thd, *lex->insert_list);
    break;

1438 1439 1440 1441
  case SQLCOM_EMPTY_QUERY:
    send_ok(&thd->net);
    break;

1442
  case SQLCOM_PURGE:
1443
  {
1444
    if (check_global_access(thd, SUPER_ACL))
1445 1446 1447 1448
      goto error;
    res = purge_master_logs(thd, lex->to_log);
    break;
  }
1449 1450
  case SQLCOM_SHOW_NEW_MASTER:
  {
1451
    if (check_global_access(thd, REPL_SLAVE_ACL))
1452
      goto error;
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1453 1454 1455 1456
#ifndef WORKING_NEW_MASTER
    net_printf(&thd->net, ER_NOT_SUPPORTED_YET, "SHOW NEW MASTER");
    res= 1;
#else
1457
    res = show_new_master(thd);
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#endif
1459 1460
    break;
  }
1461 1462
  case SQLCOM_SHOW_SLAVE_HOSTS:
  {
1463
    if (check_global_access(thd, REPL_SLAVE_ACL))
1464 1465 1466 1467
      goto error;
    res = show_slave_hosts(thd);
    break;
  }
1468 1469
  case SQLCOM_SHOW_BINLOG_EVENTS:
  {
1470
    if (check_global_access(thd, REPL_SLAVE_ACL))
1471 1472 1473 1474
      goto error;
    res = show_binlog_events(thd);
    break;
  }
1475
  case SQLCOM_BACKUP_TABLE:
1476 1477 1478
  {
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL, tables) ||
1479
	check_global_access(thd, FILE_ACL))
1480 1481
      goto error; /* purecov: inspected */
    res = mysql_backup_table(thd, tables);
1482

1483 1484
    break;
  }
1485
  case SQLCOM_RESTORE_TABLE:
1486 1487
  {
    if (check_db_used(thd,tables) ||
1488 1489
	check_table_access(thd, INSERT_ACL, tables) ||
	check_global_access(thd, FILE_ACL))
1490 1491 1492 1493
      goto error; /* purecov: inspected */
    res = mysql_restore_table(thd, tables);
    break;
  }
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  case SQLCOM_CHANGE_MASTER:
1495
  {
1496
    if (check_global_access(thd, SUPER_ACL))
1497
      goto error;
1498 1499 1500
    LOCK_ACTIVE_MI;
    res = change_master(thd,active_mi);
    UNLOCK_ACTIVE_MI;
1501 1502
    break;
  }
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1503
  case SQLCOM_SHOW_SLAVE_STAT:
1504
  {
1505 1506
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
1507
      goto error;
1508 1509 1510
    LOCK_ACTIVE_MI;
    res = show_master_info(thd,active_mi);
    UNLOCK_ACTIVE_MI;
1511 1512
    break;
  }
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  case SQLCOM_SHOW_MASTER_STAT:
1514
  {
1515 1516
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
1517 1518 1519 1520
      goto error;
    res = show_binlog_info(thd);
    break;
  }
1521 1522
    
  case SQLCOM_LOAD_MASTER_DATA: // sync with master
1523
    if (check_global_access(thd, SUPER_ACL))
1524
      goto error;
1525 1526 1527 1528
    if (end_active_trans(thd))
      res= -1;
    else
      res = load_master_data(thd);
1529 1530
    break;
    
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1531 1532 1533
#ifdef HAVE_INNOBASE_DB
  case SQLCOM_SHOW_INNODB_STATUS:
    {
1534
      if (check_global_access(thd, SUPER_ACL))
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1535 1536 1537 1538 1539
	goto error;
      res = innodb_show_status(thd);
      break;
    }
#endif
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1541
  case SQLCOM_LOAD_MASTER_TABLE:
1542
  {
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1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554
    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)
1555
	goto error;
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1556
    }
1557 1558 1559 1560 1561 1562 1563 1564
    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))
    {
      send_ok(&thd->net);
    }
    UNLOCK_ACTIVE_MI;
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    break;
1566
  }
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  case SQLCOM_CREATE_TABLE:
1568 1569 1570
  {
    ulong want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
		      CREATE_TMP_ACL : CREATE_ACL);
1571 1572
    if (!tables->db)
      tables->db=thd->db;
1573
    if (check_access(thd,want_priv,tables->db,&tables->grant.privilege) ||
1574 1575 1576
	check_merge_table_access(thd, tables->db,
				 (TABLE_LIST *)
				 lex->create_info.merge_list.first))
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      goto error;				/* purecov: inspected */
1578
    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;
1583
      bool error=check_grant(thd, want_priv, tables);
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      tables->next=tmp_table_list;
      if (error)
	goto error;
    }
1588
    if (strlen(tables->real_name) > NAME_LEN)
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1589
    {
1590
      net_printf(&thd->net, ER_WRONG_TABLE_NAME, tables->alias);
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1591 1592 1593
      res=0;
      break;
    }
1594 1595 1596
#ifndef HAVE_READLINK
    lex->create_info.data_file_name=lex->create_info.index_file_name=0;
#else
1597
    /* Fix names if symlinked tables */
1598
    if (append_file_to_dir(thd, &lex->create_info.data_file_name,
1599
			   tables->real_name) ||
1600
	append_file_to_dir(thd,&lex->create_info.index_file_name,
1601
			   tables->real_name))
1602 1603 1604 1605
    {
      res=-1;
      break;
    }
1606
#endif
1607
    if (select_lex->item_list.elements)		// With select
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1608 1609 1610 1611
    {
      select_result *result;

      if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
1612
	  check_dup(tables->db, tables->real_name, tables->next))
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1613 1614 1615 1616 1617 1618
      {
	net_printf(&thd->net,ER_INSERT_TABLE_USED,tables->real_name);
	DBUG_VOID_RETURN;
      }
      if (tables->next)
      {
1619
	TABLE_LIST *table;
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1620 1621
	if (check_table_access(thd, SELECT_ACL, tables->next))
	  goto error;				// Error message is given
1622
	/* TODO: Delete the following loop when locks is set by sql_yacc */
1623 1624
	for (table = tables->next ; table ; table=table->next)
	  table->lock_type= lex->lock_option;
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1625
      }
1626
      select_lex->options|= SELECT_NO_UNLOCK;
1627 1628 1629
      thd->offset_limit=select_lex->offset_limit;
      thd->select_limit=select_lex->select_limit+select_lex->offset_limit;
      if (thd->select_limit < select_lex->select_limit)
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1630
	thd->select_limit= HA_POS_ERROR;		// No limit
1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646

      /* 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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1647 1648 1649 1650 1651 1652 1653 1654 1655 1656
    else // regular create
    {
      res = mysql_create_table(thd,tables->db ? tables->db : thd->db,
			       tables->real_name, &lex->create_info,
			       lex->create_list,
			       lex->key_list,0, 0); // do logging
      if (!res)
	send_ok(&thd->net);
    }
    break;
1657
  }
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1658 1659 1660 1661 1662 1663 1664
  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;
1665 1666 1667 1668
    if (end_active_trans(thd))
      res= -1;
    else
      res = mysql_create_index(thd, tables, lex->key_list);
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1669 1670 1671
    break;

  case SQLCOM_SLAVE_START:
1672 1673 1674 1675
  {
    LOCK_ACTIVE_MI;
    start_slave(thd,active_mi,1 /* net report*/);
    UNLOCK_ACTIVE_MI;
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1676
    break;
1677
  }
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1678
  case SQLCOM_SLAVE_STOP:
1679 1680 1681 1682 1683 1684
  /*
    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,
1685
      so it waits for the client thread because t is locked by it.
1686
    - then the client thread does SLAVE STOP.
1687 1688
      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.
1689 1690 1691 1692 1693 1694
    To prevent that, refuse SLAVE STOP if the
    client thread has locked tables
  */
  if (thd->locked_tables || thd->active_transaction())
  {
    send_error(&thd->net,ER_LOCK_OR_ACTIVE_TRANSACTION);
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1695
    break;
1696
  }
1697 1698 1699 1700
  {
    LOCK_ACTIVE_MI;
    stop_slave(thd,active_mi,1/* net report*/);
    UNLOCK_ACTIVE_MI;
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1701
    break;
1702
  }
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  case SQLCOM_ALTER_TABLE:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
    break;
#else
    {
1709
      ulong priv=0;
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1710
      if (lex->name && (!lex->name[0] || strlen(lex->name) > NAME_LEN))
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      {
	net_printf(&thd->net,ER_WRONG_TABLE_NAME,lex->name);
	res=0;
	break;
      }
1716 1717
      if (!tables->db)
	tables->db=thd->db;
1718 1719
      if (!select_lex->db)
	select_lex->db=tables->db;
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1720
      if (check_access(thd,ALTER_ACL,tables->db,&tables->grant.privilege) ||
1721
	  check_access(thd,INSERT_ACL | CREATE_ACL,select_lex->db,&priv) ||
1722 1723 1724 1725
	  check_merge_table_access(thd, tables->db, 
				   (TABLE_LIST *)
				   lex->create_info.merge_list.first))
	goto error;				/* purecov: inspected */
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1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736
      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;
1737
	  tmp_table.db=select_lex->db;
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1738 1739 1740 1741 1742
	  tmp_table.grant.privilege=priv;
	  if (check_grant(thd,INSERT_ACL | CREATE_ACL,tables))
	    goto error;
	}
      }
1743 1744
      /* 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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1745
      /* ALTER TABLE ends previous transaction */
1746
      if (end_active_trans(thd))
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1747 1748
	res= -1;
      else
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1749
      {
1750
	res= mysql_alter_table(thd, select_lex->db, lex->name,
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1751 1752 1753
			       &lex->create_info,
			       tables, lex->create_list,
			       lex->key_list, lex->drop_list, lex->alter_list,
1754
                               (ORDER *) select_lex->order_list.first,
1755 1756
			       lex->drop_primary, lex->duplicates,
			       lex->alter_keys_onoff, lex->simple_alter);
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1757
      }
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1758 1759 1760
      break;
    }
#endif
1761
  case SQLCOM_RENAME_TABLE:
1762 1763 1764
  {
    TABLE_LIST *table;
    if (check_db_used(thd,tables))
1765
      goto error;
1766 1767
    for (table=tables ; table ; table=table->next->next)
    {
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1768 1769
      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
		       &table->grant.privilege) ||
1770 1771 1772 1773 1774
	  check_access(thd, INSERT_ACL | CREATE_ACL, table->next->db,
		       &table->next->grant.privilege))
	goto error;
      if (grant_option)
      {
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1775 1776 1777 1778 1779
	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) ||
1780
	    (!test_all_bits(table->next->grant.privilege,
1781
			    INSERT_ACL | CREATE_ACL) &&
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1782
	     check_grant(thd,INSERT_ACL | CREATE_ACL, &new_list)))
1783 1784 1785
	  goto error;
      }
    }
1786
    query_cache_invalidate3(thd, tables, 0);
1787 1788 1789
    if (end_active_trans(thd))
      res= -1;
    else if (mysql_rename_tables(thd,tables))
1790 1791
      res= -1;
    break;
1792
  }
1793 1794 1795 1796 1797 1798
  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
    DBUG_VOID_RETURN;
#else
    {
1799
      if (check_global_access(thd, SUPER_ACL))
1800 1801 1802 1803 1804
	goto error;
      res = show_binlogs(thd);
      break;
    }
#endif    
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1805
  case SQLCOM_SHOW_CREATE:
1806
#ifdef DONT_ALLOW_SHOW_COMMANDS
1807
    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
1808 1809
    DBUG_VOID_RETURN;
#else
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1810
    {
1811 1812 1813 1814
      if (check_db_used(thd, tables) ||
	  check_access(thd, SELECT_ACL | EXTRA_ACL, tables->db,
		       &tables->grant.privilege))
	goto error;
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1815
      res = mysqld_show_create(thd, tables);
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      break;
    }
1818
#endif
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  case SQLCOM_REPAIR:
1820 1821 1822 1823 1824 1825 1826
  {
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables))
      goto error; /* purecov: inspected */
    res = mysql_repair_table(thd, tables, &lex->check_opt);
    break;
  }
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  case SQLCOM_CHECK:
1828 1829 1830 1831 1832 1833 1834
  {
    if (check_db_used(thd,tables) ||
	check_table_access(thd, SELECT_ACL | EXTRA_ACL , tables))
      goto error; /* purecov: inspected */
    res = mysql_check_table(thd, tables, &lex->check_opt);
    break;
  }
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  case SQLCOM_ANALYZE:
  {
1837 1838
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables))
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1839
      goto error; /* purecov: inspected */
1840
    res = mysql_analyze_table(thd, tables, &lex->check_opt);
1841
    break;
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1842
  }
1843

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1844 1845 1846
  case SQLCOM_OPTIMIZE:
  {
    HA_CREATE_INFO create_info;
1847 1848
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables))
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1849
      goto error; /* purecov: inspected */
1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863
    if (specialflag & (SPECIAL_SAFE_MODE | SPECIAL_NO_NEW_FUNC))
    {
      /* Use ALTER TABLE */
      lex->create_list.empty();
      lex->key_list.empty();
      lex->col_list.empty();
      lex->drop_list.empty();
      lex->alter_list.empty();
      bzero((char*) &create_info,sizeof(create_info));
      create_info.db_type=DB_TYPE_DEFAULT;
      create_info.row_type=ROW_TYPE_DEFAULT;
      res= mysql_alter_table(thd, NullS, NullS, &create_info,
			     tables, lex->create_list,
			     lex->key_list, lex->drop_list, lex->alter_list,
1864
                             (ORDER *) 0,
1865 1866 1867 1868
			     0,DUP_ERROR);
    }
    else
      res = mysql_optimize_table(thd, tables, &lex->check_opt);
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    break;
  }
  case SQLCOM_UPDATE:
1872 1873
    TABLE_LIST *table;
    if (check_db_used(thd,tables))
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      goto error;
1875 1876 1877 1878 1879
    for (table=tables ; table ; table=table->next)
    {
      if (check_access(thd,UPDATE_ACL,table->db,&table->grant.privilege))
	goto error;
    }
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    if (grant_option && check_grant(thd,UPDATE_ACL,tables))
      goto error;
1882
    if (select_lex->item_list.elements != lex->value_list.elements)
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1883 1884 1885 1886
    {
      send_error(&thd->net,ER_WRONG_VALUE_COUNT);
      DBUG_VOID_RETURN;
    }
1887 1888
    if (select_lex->table_list.elements == 1)
    {
1889 1890 1891 1892 1893 1894 1895
      res= mysql_update(thd,tables,
			select_lex->item_list,
			lex->value_list,
			select_lex->where,
			(ORDER *) select_lex->order_list.first,
			select_lex->select_limit,
			lex->duplicates);
1896
    }
1897
    else
1898
    {
1899 1900
      const char *msg= 0;
      lex->sql_command= SQLCOM_MULTI_UPDATE;
1901 1902 1903 1904 1905 1906
      if (select_lex->order_list.elements)
	msg="ORDER BY";
      else if (select_lex->select_limit && select_lex->select_limit !=
	       HA_POS_ERROR)
	msg="LIMIT";
      if (msg)
1907
      {
1908 1909 1910
	net_printf(&thd->net, ER_WRONG_USAGE, "UPDATE", msg);
	res= 1;
	break;
1911
      }
1912 1913 1914 1915 1916 1917
      res= mysql_multi_update(thd,tables,
			      &select_lex->item_list,
			      &lex->value_list,
			      select_lex->where,
			      select_lex->options,
			      lex->duplicates);
1918
    }
1919
    break;
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  case SQLCOM_INSERT:
    if (check_access(thd,INSERT_ACL,tables->db,&tables->grant.privilege))
      goto error; /* purecov: inspected */
    if (grant_option && check_grant(thd,INSERT_ACL,tables))
      goto error;
    res = mysql_insert(thd,tables,lex->field_list,lex->many_values,
1926
		       lex->duplicates);
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1927 1928
    break;
  case SQLCOM_REPLACE:
1929
    if (check_access(thd,INSERT_ACL | DELETE_ACL,
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1930 1931
		     tables->db,&tables->grant.privilege))
      goto error; /* purecov: inspected */
1932
    if (grant_option && check_grant(thd,INSERT_ACL | DELETE_ACL,
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1933 1934 1935 1936
				    tables))

      goto error;
    res = mysql_insert(thd,tables,lex->field_list,lex->many_values,
1937
		       DUP_REPLACE);
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    break;
  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
1942

1943 1944 1945 1946
    /*
      Check that we have modify privileges for the first table and
      select privileges for the rest
    */
1947
    {
1948
      ulong privilege= (lex->sql_command == SQLCOM_INSERT_SELECT ?
1949
			INSERT_ACL : INSERT_ACL | DELETE_ACL);
1950 1951 1952 1953 1954 1955 1956 1957 1958 1959
      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;
    }
1960 1961
    /* Don't unlock tables until command is written to binary log */
    select_lex->options|= SELECT_NO_UNLOCK;
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1962 1963

    select_result *result;
1964 1965 1966
    thd->offset_limit=select_lex->offset_limit;
    thd->select_limit=select_lex->select_limit+select_lex->offset_limit;
    if (thd->select_limit < select_lex->select_limit)
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1967 1968
      thd->select_limit= HA_POS_ERROR;		// No limit

1969
    if (check_dup(tables->db, tables->real_name, tables->next))
1970 1971 1972
    {
      net_printf(&thd->net,ER_INSERT_TABLE_USED,tables->real_name);
      DBUG_VOID_RETURN;
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1973
    }
1974
    {
1975
      /* TODO: Delete the following loop when locks is set by sql_yacc */
1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986
      TABLE_LIST *table;
      for (table = tables->next ; table ; table=table->next)
	table->lock_type= lex->lock_option;
    }

    /* Skip first table, which is the table we are inserting in */
    lex->select_lex.table_list.first=
      (byte*) (((TABLE_LIST *) lex->select_lex.table_list.first)->next);
    if (!(res=open_and_lock_tables(thd, tables)))
    {
      if ((result=new select_insert(tables->table,&lex->field_list,
1987
				    lex->duplicates)))
1988 1989 1990 1991
	res=handle_select(thd,lex,result);
    }
    else
      res= -1;
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1992 1993
    break;
  }
1994
  case SQLCOM_TRUNCATE:
1995 1996
    if (check_access(thd,DELETE_ACL,tables->db,&tables->grant.privilege))
      goto error; /* purecov: inspected */
1997 1998
    if (grant_option && check_grant(thd,DELETE_ACL,tables))
      goto error;
1999 2000 2001 2002 2003 2004
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
    if (thd->locked_tables || thd->active_transaction())
    {
2005
      send_error(&thd->net,ER_LOCK_OR_ACTIVE_TRANSACTION,NullS);
2006 2007 2008 2009
      goto error;
    }
    res=mysql_truncate(thd,tables);
    break;
2010
  case SQLCOM_DELETE:
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2011 2012 2013 2014 2015 2016 2017
  {
    if (check_access(thd,DELETE_ACL,tables->db,&tables->grant.privilege))
      goto error; /* purecov: inspected */
    if (grant_option && check_grant(thd,DELETE_ACL,tables))
      goto error;
    // Set privilege for the WHERE clause
    tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
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2018 2019
    res = mysql_delete(thd,tables, select_lex->where,
                       (ORDER*) select_lex->order_list.first,
2020
                       select_lex->select_limit, select_lex->options);
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2021 2022
    break;
  }
2023
  case SQLCOM_DELETE_MULTI:
2024 2025 2026 2027 2028
  {
    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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2029

2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055
    /* sql_yacc guarantees that tables and aux_tables are not zero */
    if (check_db_used(thd, tables) || check_db_used(thd,aux_tables) ||
	check_table_access(thd,SELECT_ACL, tables) || 
	check_table_access(thd,DELETE_ACL, aux_tables))
      goto error;
    if ((thd->options & OPTION_SAFE_UPDATES) && !select_lex->where)
    {		
      send_error(&thd->net,ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE);
      goto error;
    }
    for (auxi=(TABLE_LIST*) aux_tables ; auxi ; auxi=auxi->next)
    {
      table_count++;
      /* All tables in aux_tables must be found in FROM PART */
      TABLE_LIST *walk;
      for (walk=(TABLE_LIST*) tables ; walk ; walk=walk->next)
      {
	if (!strcmp(auxi->real_name,walk->real_name) &&
	    !strcmp(walk->db,auxi->db))
	  break;
      }
      if (!walk)
      {
	net_printf(&thd->net,ER_NONUNIQ_TABLE,auxi->real_name);
	goto error;
      }
2056
      walk->lock_type= auxi->lock_type;
2057 2058
      // Store address to table as we need it later
      auxi->table= my_reinterpret_cast(TABLE *) (walk);
2059 2060 2061
    }
    if (add_item_to_list(new Item_null()))
    {
2062
      res= -1;
2063
      break;
2064 2065 2066 2067 2068 2069 2070
    }
    tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
    thd->proc_info="init";
    if ((res=open_and_lock_tables(thd,tables)))
      break;
    /* Fix tables-to-be-deleted-from list to point at opened tables */
    for (auxi=(TABLE_LIST*) aux_tables ; auxi ; auxi=auxi->next)
2071 2072
      auxi->table= (my_reinterpret_cast(TABLE_LIST*) (auxi->table))->table;

2073 2074
    if (!thd->fatal_error && (result= new multi_delete(thd,aux_tables,
						       table_count)))
2075 2076
    {
      res=mysql_select(thd,tables,select_lex->item_list,
2077
		       select_lex->where,
2078 2079 2080
		       (ORDER *)NULL,(ORDER *)NULL,(Item *)NULL,
		       (ORDER *)NULL,
		       select_lex->options | thd->options |
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2081
		       SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK,
2082
		       result);
2083
      delete result;
2084 2085 2086 2087 2088 2089
    }
    else
      res= -1;					// Error is not sent
    close_thread_tables(thd);
    break;
  }
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2090
  case SQLCOM_DROP_TABLE:
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2091 2092 2093
  {
    if (check_table_access(thd,DROP_ACL,tables))
      goto error;				/* purecov: inspected */
2094 2095 2096 2097 2098 2099 2100 2101 2102 2103
    /*
      If this is a slave thread, we may sometimes execute some 
      DROP / * 40005 TEMPORARY * / TABLE
      that come from parts of binlogs (likely if we use RESET SLAVE or CHANGE
      MASTER TO), while the temporary table has already been dropped.
      To not generate such irrelevant "table does not exist errors", we silently
      add IF EXISTS if TEMPORARY was used.
    */
    if (thd->slave_thread && lex->drop_temporary)
      lex->drop_if_exists= 1;
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2104 2105 2106 2107 2108 2109
    if (end_active_trans(thd))
      res= -1;
    else
      res = mysql_rm_table(thd,tables,lex->drop_if_exists);
  }
  break;
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2110 2111 2112 2113 2114 2115 2116
  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;
2117 2118 2119 2120
    if (end_active_trans(thd))
      res= -1;
    else
      res = mysql_drop_index(thd, tables, lex->drop_list);
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2121 2122
    break;
  case SQLCOM_SHOW_DATABASES:
2123
#if defined(DONT_ALLOW_SHOW_COMMANDS)
2124
    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND);   /* purecov: inspected */
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2125 2126 2127
    DBUG_VOID_RETURN;
#else
    if ((specialflag & SPECIAL_SKIP_SHOW_DB) &&
2128
	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:
2134
    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
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2135 2136 2137 2138 2139
      break;
    mysqld_list_processes(thd,thd->master_access & PROCESS_ACL ? NullS :
			  thd->priv_user,lex->verbose);
    break;
  case SQLCOM_SHOW_STATUS:
2140
    res= mysqld_show(thd,(lex->wild ? lex->wild->ptr() : NullS),status_vars,
2141
		     OPT_GLOBAL);
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2142 2143 2144
    break;
  case SQLCOM_SHOW_VARIABLES:
    res= mysqld_show(thd, (lex->wild ? lex->wild->ptr() : NullS),
2145
		     init_vars, lex->option_type);
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2146
    break;
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2147
  case SQLCOM_SHOW_LOGS:
2148 2149 2150 2151
  {
    res= mysqld_show_logs(thd);
    break;
  }
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2152
  case SQLCOM_SHOW_TABLES:
2153
    /* FALL THROUGH */
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#ifdef DONT_ALLOW_SHOW_COMMANDS
    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
    DBUG_VOID_RETURN;
#else
    {
2159
      char *db=select_lex->db ? select_lex->db : thd->db;
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2160 2161 2162 2163 2164 2165
      if (!db)
      {
	send_error(&thd->net,ER_NO_DB_ERROR);	/* purecov: inspected */
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);				// Fix escaped '_'
2166
      if (check_db_name(db))
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2167
      {
2168 2169
        net_printf(&thd->net,ER_WRONG_DB_NAME, db);
        goto error;
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2170 2171 2172 2173
      }
      if (check_access(thd,SELECT_ACL,db,&thd->col_access))
	goto error;				/* purecov: inspected */
      /* grant is checked in mysqld_show_tables */
2174
      if (select_lex->options & SELECT_DESCRIBE)
2175
        res= mysqld_extend_show_tables(thd,db,
2176
				       (lex->wild ? lex->wild->ptr() : NullS));
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2177 2178 2179 2180 2181 2182
      else
	res= mysqld_show_tables(thd,db,
				(lex->wild ? lex->wild->ptr() : NullS));
      break;
    }
#endif
2183 2184 2185
  case SQLCOM_SHOW_OPEN_TABLES:
    res= mysqld_show_open_tables(thd,(lex->wild ? lex->wild->ptr() : NullS));
    break;
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2186 2187 2188 2189 2190 2191
  case SQLCOM_SHOW_FIELDS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
    DBUG_VOID_RETURN;
#else
    {
2192 2193
      char *db=tables->db;
      if (!*db)
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2194 2195 2196 2197 2198
      {
	send_error(&thd->net,ER_NO_DB_ERROR);	/* purecov: inspected */
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);			// Fix escaped '_'
2199
      remove_escape(tables->real_name);
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2200 2201 2202 2203 2204 2205
      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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2206 2207
			      (lex->wild ? lex->wild->ptr() : NullS),
			      lex->verbose);
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2208 2209 2210 2211 2212 2213 2214 2215 2216
      break;
    }
#endif
  case SQLCOM_SHOW_KEYS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
    DBUG_VOID_RETURN;
#else
    {
2217
      char *db=tables->db;
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2218 2219 2220 2221 2222 2223
      if (!db)
      {
	send_error(&thd->net,ER_NO_DB_ERROR);	/* purecov: inspected */
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);			// Fix escaped '_'
2224
      remove_escape(tables->real_name);
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2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236
      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:
2237
    mysql_change_db(thd,select_lex->db);
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2238 2239 2240 2241 2242
    break;
  case SQLCOM_LOAD:
  {
    uint privilege= (lex->duplicates == DUP_REPLACE ?
		     INSERT_ACL | UPDATE_ACL | DELETE_ACL : INSERT_ACL);
2243 2244

    if (!lex->local_file)
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2245 2246 2247 2248 2249 2250
    {
      if (check_access(thd,privilege | FILE_ACL,tables->db))
	goto error;
    }
    else
    {
2251
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
2252
	  ! opt_local_infile)
2253 2254 2255 2256
      {
	send_error(&thd->net,ER_NOT_ALLOWED_COMMAND);
	goto error;
      }
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2257
      if (check_access(thd,privilege,tables->db,&tables->grant.privilege) ||
2258
	  grant_option && check_grant(thd,privilege,tables))
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	goto error;
    }
    res=mysql_load(thd, lex->exchange, tables, lex->field_list,
		   lex->duplicates, (bool) lex->local_file, lex->lock_option);
    break;
  }
  case SQLCOM_SET_OPTION:
2266
    if (!(res=sql_set_variables(thd, &lex->var_list)))
2267
      send_ok(&thd->net);
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    break;
  case SQLCOM_UNLOCK_TABLES:
2270
    unlock_locked_tables(thd);
2271 2272
    if (thd->options & OPTION_TABLE_LOCK)
    {
2273
      end_active_trans(thd);
2274
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
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    }
    if (thd->global_read_lock)
2277
      unlock_global_read_lock(thd);
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    send_ok(&thd->net);
    break;
  case SQLCOM_LOCK_TABLES:
2281
    unlock_locked_tables(thd);
2282
    if (check_db_used(thd,tables) || end_active_trans(thd))
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2283
      goto error;
2284
    if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, tables))
2285
      goto error;
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2286
    thd->in_lock_tables=1;
2287
    thd->options|= OPTION_TABLE_LOCK;
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    if (!(res=open_and_lock_tables(thd,tables)))
    {
      thd->locked_tables=thd->lock;
      thd->lock=0;
      send_ok(&thd->net);
    }
2294 2295
    else
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
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    thd->in_lock_tables=0;
    break;
  case SQLCOM_CREATE_DB:
2299
  {
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2300
    if (!strip_sp(lex->name) || check_db_name(lex->name))
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2301
    {
2302
      net_printf(&thd->net,ER_WRONG_DB_NAME, lex->name);
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      break;
    }
2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316
    /*
      If in a slave thread :
      CREATE DATABASE DB was certainly not preceded by USE DB.
      For that reason, db_ok() in sql/slave.cc did not check the 
      do_db/ignore_db. And as this query involves no tables, tables_ok()
      above was not called. So we have to check rules again here.
    */
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
      break;

2317 2318
    if (check_access(thd,CREATE_ACL,lex->name,0,1))
      break;
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2319
    res=mysql_create_db(thd,lex->name,lex->create_info.options,0);
2320 2321
    break;
  }
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2322
  case SQLCOM_DROP_DB:
2323
  {
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2324
    if (!strip_sp(lex->name) || check_db_name(lex->name))
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2325
    {
2326
      net_printf(&thd->net,ER_WRONG_DB_NAME, lex->name);
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2327 2328
      break;
    }
2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339
    /*
      If in a slave thread :
      DROP DATABASE DB may not be preceded by USE DB.
      For that reason, maybe db_ok() in sql/slave.cc did not check the 
      do_db/ignore_db. And as this query involves no tables, tables_ok()
      above was not called. So we have to check rules again here.
    */
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
      break;
2340
    if (check_access(thd,DROP_ACL,lex->name,0,1))
2341
      break;
2342 2343
    if (thd->locked_tables || thd->active_transaction())
    {
2344
      send_error(&thd->net,ER_LOCK_OR_ACTIVE_TRANSACTION);
2345 2346
      goto error;
    }
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2347
    res=mysql_rm_db(thd,lex->name,lex->drop_if_exists,0);
2348 2349
    break;
  }
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2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369
  case SQLCOM_CREATE_FUNCTION:
    if (check_access(thd,INSERT_ACL,"mysql",0,1))
      break;
#ifdef HAVE_DLOPEN
    if (!(res = mysql_create_function(thd,&lex->udf)))
      send_ok(&thd->net);
#else
    res= -1;
#endif
    break;
  case SQLCOM_DROP_FUNCTION:
    if (check_access(thd,DELETE_ACL,"mysql",0,1))
      break;
#ifdef HAVE_DLOPEN
    if (!(res = mysql_drop_function(thd,lex->udf.name)))
      send_ok(&thd->net);
#else
    res= -1;
#endif
    break;
2370 2371 2372 2373 2374 2375 2376 2377 2378
  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;

2379 2380 2381 2382
    /*
      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
    */
2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407

    if (thd->user)				// If not replication
    {
      LEX_USER *user;
      List_iterator <LEX_USER> user_list(lex->users_list);
      while ((user=user_list++))
      {
	if (user->password.str &&
	    (strcmp(thd->user,user->user.str) ||
	     user->host.str &&
	     my_strcasecmp(user->host.str, thd->host_or_ip)))
	{
	  if (check_access(thd, UPDATE_ACL, "mysql",0,1))
	    goto error;
	  break;			// We are allowed to do changes
	}
      }
    }
    if (tables)
    {
      if (grant_option && check_grant(thd,
				      (lex->grant | lex->grant_tot_col |
				       GRANT_ACL),
				      tables))
	goto error;
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2408 2409 2410
      if (!(res = mysql_table_grant(thd,tables,lex->users_list, lex->columns,
				    lex->grant,
				    lex->sql_command == SQLCOM_REVOKE)))
2411
      {
2412
	mysql_update_log.write(thd, thd->query, thd->query_length);
2413 2414
	if (mysql_bin_log.is_open())
	{
2415
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
2416 2417 2418 2419 2420 2421 2422 2423
	  mysql_bin_log.write(&qinfo);
	}
      }
    }
    else
    {
      if (lex->columns.elements)
      {
2424
	send_error(&thd->net,ER_ILLEGAL_GRANT_FOR_TABLE);
2425 2426 2427 2428 2429 2430 2431
	res=1;
      }
      else
	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
			  lex->sql_command == SQLCOM_REVOKE);
      if (!res)
      {
2432
	mysql_update_log.write(thd, thd->query, thd->query_length);
2433 2434
	if (mysql_bin_log.is_open())
	{
2435
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
2436 2437
	  mysql_bin_log.write(&qinfo);
	}
2438
	if (mqh_used && lex->sql_command == SQLCOM_GRANT)
2439
	{
2440 2441 2442
	  List_iterator <LEX_USER> str_list(lex->users_list);
	  LEX_USER *user;
	  while ((user=str_list++))
2443
	    reset_mqh(thd,user);
2444
	}
2445 2446 2447 2448
      }
    }
    break;
  }
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2449
  case SQLCOM_FLUSH:
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  case SQLCOM_RESET:
2451
    if (check_global_access(thd,RELOAD_ACL) || check_db_used(thd, tables))
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2452
      goto error;
2453 2454
    /* error sending is deferred to reload_acl_and_cache */
    reload_acl_and_cache(thd, lex->type, tables) ;
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2455 2456 2457 2458 2459 2460
    break;
  case SQLCOM_KILL:
    kill_one_thread(thd,lex->thread_id);
    break;
  case SQLCOM_SHOW_GRANTS:
    res=0;
2461 2462
    if ((thd->priv_user &&
	 !strcmp(thd->priv_user,lex->grant_user->user.str)) ||
2463
	!check_access(thd, SELECT_ACL, "mysql",0,1))
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2464 2465 2466 2467
    {
      res = mysql_show_grants(thd,lex->grant_user);
    }
    break;
2468
  case SQLCOM_HA_OPEN:
2469 2470
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL, tables))
2471 2472 2473 2474 2475 2476 2477 2478 2479
      goto error;
    res = mysql_ha_open(thd, tables);
    break;
  case SQLCOM_HA_CLOSE:
    if (check_db_used(thd,tables))
      goto error;
    res = mysql_ha_close(thd, tables);
    break;
  case SQLCOM_HA_READ:
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2480 2481 2482 2483
    /* there is no need to check for table permissions here, because
       if a user has no permissions to read a table, he won't be
       able to open it (with SQLCOM_HA_OPEN) in the first place. */
    if (check_db_used(thd,tables))
2484
      goto error;
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2485
    res = mysql_ha_read(thd, tables, lex->ha_read_mode, lex->backup_dir,
2486 2487
			lex->insert_list, lex->ha_rkey_mode, select_lex->where,
			select_lex->select_limit, select_lex->offset_limit);
2488 2489
    break;

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2490
  case SQLCOM_BEGIN:
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2491 2492 2493 2494 2495 2496
    if (thd->locked_tables)
    {
      thd->lock=thd->locked_tables;
      thd->locked_tables=0;			// Will be automaticly closed
      close_thread_tables(thd);			// Free tables
    }
2497 2498 2499 2500 2501 2502
    if (end_active_trans(thd))
    {
      res= -1;
    }
    else
    {
2503
      thd->options= ((thd->options & (ulong) ~(OPTION_STATUS_NO_TRANS_UPDATE)) |
2504 2505 2506 2507
		     OPTION_BEGIN);
      thd->server_status|= SERVER_STATUS_IN_TRANS;
      send_ok(&thd->net);
    }
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    break;
  case SQLCOM_COMMIT:
2510 2511 2512 2513 2514
    /*
      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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2515
  {
2516
    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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2519
    {
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2520
      send_ok(&thd->net);
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2521
    }
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    else
      res= -1;
    break;
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2525
  }
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  case SQLCOM_ROLLBACK:
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    if (!ha_rollback(thd))
2529 2530 2531 2532 2533 2534
    {
      if (thd->options & OPTION_STATUS_NO_TRANS_UPDATE)
	send_warning(&thd->net,ER_WARNING_NOT_COMPLETE_ROLLBACK,0);
      else
	send_ok(&thd->net);
    }
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    else
      res= -1;
2537
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
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2538
    break;
2539 2540 2541
  case SQLCOM_SAVEPOINT:
    send_ok(&thd->net);
    break;
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  default:					/* Impossible */
    send_ok(&thd->net);
    break;
  }
  thd->proc_info="query end";			// QQ
  if (res < 0)
    send_error(&thd->net,thd->killed ? ER_SERVER_SHUTDOWN : 0);

error:
  DBUG_VOID_RETURN;
}


/****************************************************************************
2556
  Get the user (global) and database privileges for all used tables
2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569

  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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2570 2571
                is enough to satisfy the request and the global grants contains
                a SELECT grant.
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2572 2573 2574
****************************************************************************/

bool
2575
check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
2576
	     bool dont_check_global_grants, bool no_errors)
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2577
{
2578 2579 2580 2581
  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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2582 2583 2584 2585 2586
  if (save_priv)
    *save_priv=0;
  else
    save_priv= &dummy;

2587
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
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2588
  {
2589 2590
    if (!no_errors)
      send_error(&thd->net,ER_NO_DB_ERROR);	/* purecov: tested */
2591
    DBUG_RETURN(TRUE);				/* purecov: tested */
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2592 2593 2594 2595
  }

  if ((thd->master_access & want_access) == want_access)
  {
2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606
    /*
      If we don't have a global SELECT privilege, we have to get the database
      specific access rights to be able to handle queries of type
      UPDATE t1 SET a=1 WHERE b > 0
    */
    db_access= thd->db_access;
    if (!(thd->master_access & SELECT_ACL) &&
	(db && (!thd->db || strcmp(db,thd->db))))
      db_access=acl_get(thd->host, thd->ip, (char*) &thd->remote.sin_addr,
			thd->priv_user, db); /* purecov: inspected */
    *save_priv=thd->master_access | db_access;
2607
    DBUG_RETURN(FALSE);
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2608
  }
2609
  if (((want_access & ~thd->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
2610
      ! db && dont_check_global_grants)
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2611
  {						// We can never grant this
2612 2613 2614
    if (!no_errors)
      net_printf(&thd->net,ER_ACCESS_DENIED_ERROR,
		 thd->priv_user,
2615
		 thd->priv_host,
2616
		 thd->password ? ER(ER_YES) : ER(ER_NO));/* purecov: tested */
2617
    DBUG_RETURN(TRUE);				/* purecov: tested */
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2618 2619 2620
  }

  if (db == any_db)
2621
    DBUG_RETURN(FALSE);				// Allow select on anything
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2622

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  if (db && (!thd->db || strcmp(db,thd->db)))
    db_access=acl_get(thd->host, thd->ip, (char*) &thd->remote.sin_addr,
		      thd->priv_user, db); /* purecov: inspected */
  else
    db_access=thd->db_access;
2628 2629
  // Remove SHOW attribute and access rights we already have
  want_access &= ~(thd->master_access | EXTRA_ACL);
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2630
  db_access= ((*save_priv=(db_access | thd->master_access)) & want_access);
2631 2632

  /* grant_option is set if there exists a single table or column grant */
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2633
  if (db_access == want_access ||
2634 2635
      ((grant_option && !dont_check_global_grants) &&
       !(want_access & ~TABLE_ACLS)))
2636
    DBUG_RETURN(FALSE);				/* Ok */
2637 2638 2639
  if (!no_errors)
    net_printf(&thd->net,ER_DBACCESS_DENIED_ERROR,
	       thd->priv_user,
2640
	       thd->priv_host,
2641
	       db ? db : thd->db ? thd->db : "unknown"); /* purecov: tested */
2642
  DBUG_RETURN(TRUE);				/* purecov: tested */
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2643 2644 2645
}


2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663
/*
  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
*/
2664 2665

bool check_global_access(THD *thd, ulong want_access)
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2666
{
2667
  char command[128];
2668
  if ((thd->master_access & want_access))
2669 2670 2671 2672 2673
    return 0;
  get_privilege_desc(command, sizeof(command), want_access);
  net_printf(&thd->net,ER_SPECIFIC_ACCESS_DENIED_ERROR,
	     command);
  return 1;
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}


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2677
/*
2678 2679
  Check the privilege for all used tables.  Table privileges are cached
  in the table list for GRANT checking
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2680 2681
*/

2682
bool
2683
check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
2684
		   bool no_errors)
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2685
{
2686 2687
  uint found=0;
  ulong found_access=0;
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  TABLE_LIST *org_tables=tables;
  for (; tables ; tables=tables->next)
  {
2691 2692
    if ((thd->master_access & want_access) == (want_access & ~EXTRA_ACL) &&
	thd->db)
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2693
      tables->grant.privilege= want_access;
2694
    else if (tables->db && tables->db == thd->db)
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2695 2696 2697 2698 2699
    {
      if (found && !grant_option)		// db already checked
	tables->grant.privilege=found_access;
      else
      {
2700 2701
	if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
			 0, no_errors))
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2702 2703
	  return TRUE;				// Access denied
	found_access=tables->grant.privilege;
2704
	found=1;
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      }
    }
2707
    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
2708
			  0, no_errors))
2709
      return TRUE;
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2710 2711
  }
  if (grant_option)
2712
    return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
2713
		       test(want_access & EXTRA_ACL), no_errors);
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  return FALSE;
}


2718
static bool check_db_used(THD *thd,TABLE_LIST *tables)
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{
  for (; tables ; tables=tables->next)
  {
    if (!tables->db)
    {
      if (!(tables->db=thd->db))
      {
	send_error(&thd->net,ER_NO_DB_ERROR);	/* purecov: tested */
	return TRUE;				/* purecov: tested */
      }
    }
  }
  return FALSE;
}


2735 2736
static bool check_merge_table_access(THD *thd, char *db,
				     TABLE_LIST *table_list)
2737 2738 2739 2740
{
  int error=0;
  if (table_list)
  {
2741
    /* Check that all tables use the current database */
2742 2743
    TABLE_LIST *tmp;
    for (tmp=table_list; tmp ; tmp=tmp->next)
2744 2745 2746
    {
      if (!tmp->db || !tmp->db[0])
	tmp->db=db;
2747
      else if (strcmp(tmp->db,db))
2748 2749 2750 2751 2752
      {
	send_error(&thd->net,ER_UNION_TABLES_IN_DIFFERENT_DIR);
	return 1;
      }
    }
2753 2754 2755 2756 2757 2758 2759
    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

2770
#ifndef EMBEDDED_LIBRARY
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bool check_stack_overrun(THD *thd,char *buf __attribute__((unused)))
{
  long stack_used;
  if ((stack_used=used_stack(thd->thread_stack,(char*) &stack_used)) >=
      (long) thread_stack_min)
  {
    sprintf(errbuff[0],ER(ER_STACK_OVERRUN),stack_used,thread_stack);
    my_message(ER_STACK_OVERRUN,errbuff[0],MYF(0));
    thd->fatal_error=1;
    return 1;
  }
  return 0;
}
2784
#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;
}


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

static void
mysql_init_query(THD *thd)
{
  DBUG_ENTER("mysql_init_query");
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  thd->lex.select_lex.item_list.empty();
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  thd->lex.value_list.empty();
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  thd->lex.select_lex.table_list.elements=0;
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  thd->free_list=0;  thd->lex.union_option=0;
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  thd->lex.select = &thd->lex.select_lex;
  thd->lex.select_lex.table_list.first=0;
  thd->lex.select_lex.table_list.next= (byte**) &thd->lex.select_lex.table_list.first;
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  thd->lex.select_lex.next=0;
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  thd->lex.olap=0;
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  thd->lex.select->olap= UNSPECIFIED_OLAP_TYPE;
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  thd->fatal_error=0;				// Safety
  thd->last_insert_id_used=thd->query_start_used=thd->insert_id_used=0;
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  thd->rand_used=0;
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  thd->sent_row_count=thd->examined_row_count=0;
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  thd->safe_to_cache_query=1;
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  DBUG_VOID_RETURN;
}

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

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bool
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mysql_new_select(LEX *lex)
{
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  SELECT_LEX *select_lex = (SELECT_LEX *) lex->thd->calloc(sizeof(SELECT_LEX));
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  if (!select_lex)
    return 1;
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  lex->select->next=select_lex; 
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  lex->select=select_lex;
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  select_lex->table_list.next= (byte**) &select_lex->table_list.first;
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  select_lex->item_list.empty();
  select_lex->when_list.empty(); 
  select_lex->expr_list.empty();
  select_lex->interval_list.empty(); 
  select_lex->use_index.empty();
  select_lex->ftfunc_list.empty();
  return 0;
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}
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void mysql_init_multi_delete(LEX *lex)
{
  lex->sql_command =  SQLCOM_DELETE_MULTI;
  mysql_init_select(lex);
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  lex->select->select_limit=lex->thd->select_limit=HA_POS_ERROR;
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  lex->auxilliary_table_list=lex->select_lex.table_list;
  lex->select->table_list.elements=0; 
  lex->select->table_list.first=0;
  lex->select->table_list.next= (byte**) &(lex->select->table_list.first);
}
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void
mysql_parse(THD *thd,char *inBuf,uint length)
{
  DBUG_ENTER("mysql_parse");

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


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

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

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

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

  if (new_field->length && new_field->decimals &&
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      new_field->length < new_field->decimals+1 &&
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      new_field->decimals != NOT_FIXED_DEC)
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    new_field->length=new_field->decimals+1; /* purecov: inspected */
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  switch (type) {
  case FIELD_TYPE_TINY:
    if (!length) new_field->length=3+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_SHORT:
    if (!length) new_field->length=5+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_INT24:
    if (!length) new_field->length=8+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_LONG:
    if (!length) new_field->length=10+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_LONGLONG:
    if (!length) new_field->length=20;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_STRING:
  case FIELD_TYPE_VAR_STRING:
  case FIELD_TYPE_NULL:
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  case FIELD_TYPE_GEOMETRY:
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    break;
  case FIELD_TYPE_DECIMAL:
    if (!length)
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      new_field->length= 10;			// Default length for DECIMAL
    if (new_field->length < MAX_FIELD_WIDTH)	// Skip wrong argument
    {
      new_field->length+=sign_len;
      if (new_field->decimals)
	new_field->length++;
    }
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    break;
  case FIELD_TYPE_BLOB:
  case FIELD_TYPE_TINY_BLOB:
  case FIELD_TYPE_LONG_BLOB:
  case FIELD_TYPE_MEDIUM_BLOB:
    if (default_value)				// Allow empty as default value
    {
      String str,*res;
      res=default_value->val_str(&str);
      if (res->length())
      {
	net_printf(&thd->net,ER_BLOB_CANT_HAVE_DEFAULT,field_name); /* purecov: inspected */
	DBUG_RETURN(1); /* purecov: inspected */
      }
      new_field->def=0;
    }
    new_field->flags|=BLOB_FLAG;
    break;
  case FIELD_TYPE_YEAR:
    if (!length || new_field->length != 2)
      new_field->length=4;			// Default length
    new_field->flags|= ZEROFILL_FLAG | UNSIGNED_FLAG;
    break;
  case FIELD_TYPE_FLOAT:
    /* change FLOAT(precision) to FLOAT or DOUBLE */
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    if (length && !decimals)
    {
      uint tmp_length=new_field->length;
      if (tmp_length > PRECISION_FOR_DOUBLE)
      {
	net_printf(&thd->net,ER_WRONG_FIELD_SPEC,field_name);
	DBUG_RETURN(1);
      }
      else if (tmp_length > PRECISION_FOR_FLOAT)
      {
	new_field->sql_type=FIELD_TYPE_DOUBLE;
	new_field->length=DBL_DIG+7;			// -[digits].E+###
      }
      else
	new_field->length=FLT_DIG+6;			// -[digits].E+##
      new_field->decimals= NOT_FIXED_DEC;
      break;
    }
    if (!length)
    {
      new_field->length =  FLT_DIG+6;
      new_field->decimals= NOT_FIXED_DEC;
    }
    break;
  case FIELD_TYPE_DOUBLE:
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    if (!length)
    {
      new_field->length = DBL_DIG+7;
      new_field->decimals=NOT_FIXED_DEC;
    }
    break;
  case FIELD_TYPE_TIMESTAMP:
    if (!length)
      new_field->length= 14;			// Full date YYYYMMDDHHMMSS
    else
    {
      new_field->length=((new_field->length+1)/2)*2; /* purecov: inspected */
      new_field->length= min(new_field->length,14); /* purecov: inspected */
    }
    new_field->flags|= ZEROFILL_FLAG | UNSIGNED_FLAG | NOT_NULL_FLAG;
    break;
  case FIELD_TYPE_DATE:				// Old date type
    if (protocol_version != PROTOCOL_VERSION-1)
      new_field->sql_type=FIELD_TYPE_NEWDATE;
    /* fall trough */
  case FIELD_TYPE_NEWDATE:
    new_field->length=10;
    break;
  case FIELD_TYPE_TIME:
    new_field->length=10;
    break;
  case FIELD_TYPE_DATETIME:
    new_field->length=19;
    break;
  case FIELD_TYPE_SET:
    {
      if (interval->count > sizeof(longlong)*8)
      {
	net_printf(&thd->net,ER_TOO_BIG_SET,field_name); /* purecov: inspected */
	DBUG_RETURN(1);				/* purecov: inspected */
      }
      new_field->pack_length=(interval->count+7)/8;
      if (new_field->pack_length > 4)
	new_field->pack_length=8;
      new_field->interval=interval;
      new_field->length=0;
      for (const char **pos=interval->type_names; *pos ; pos++)
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      {
	new_field->length+=(uint) strip_sp((char*) *pos)+1;
      }
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      new_field->length--;
      set_if_smaller(new_field->length,MAX_FIELD_WIDTH-1);
      if (default_value)
      {
	thd->cuted_fields=0;
	String str,*res;
	res=default_value->val_str(&str);
	(void) find_set(interval,res->ptr(),res->length());
	if (thd->cuted_fields)
	{
	  net_printf(&thd->net,ER_INVALID_DEFAULT,field_name);
	  DBUG_RETURN(1);
	}
      }
    }
    break;
  case FIELD_TYPE_ENUM:
    {
      new_field->interval=interval;
      new_field->pack_length=interval->count < 256 ? 1 : 2; // Should be safe
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      new_field->length=(uint) strip_sp((char*) interval->type_names[0]);
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      for (const char **pos=interval->type_names+1; *pos ; pos++)
      {
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	uint length=(uint) strip_sp((char*) *pos);
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	set_if_bigger(new_field->length,length);
      }
      set_if_smaller(new_field->length,MAX_FIELD_WIDTH-1);
      if (default_value)
      {
	String str,*res;
	res=default_value->val_str(&str);
	if (!find_enum(interval,res->ptr(),res->length()))
	{
	  net_printf(&thd->net,ER_INVALID_DEFAULT,field_name);
	  DBUG_RETURN(1);
	}
      }
      break;
    }
  }

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

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

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

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

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


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

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

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


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


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/*
  Add a table to list of used tables

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

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

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

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

  if (!alias)					/* Alias is case sensitive */
3331
    if (!(alias_str=thd->memdup(alias_str,table->table.length+1)))
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      DBUG_RETURN(0);
3333
    
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  if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
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    DBUG_RETURN(0);				/* purecov: inspected */
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  if (table->db.str) 
  {
    ptr->db= table->db.str;
    ptr->db_length= table->db.length;
  }
  else if (thd->db)
  {
    ptr->db= thd->db;
    ptr->db_length= thd->db_length;
  }
  else
  {
    ptr->db= (char*) "";
    ptr->db_length= 0;
  }
    
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  ptr->alias= alias_str;
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  if (lower_case_table_names)
    casedn_str(table->table.str);
  ptr->real_name=table->table.str;
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  ptr->real_name_length=table->table.length;
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  ptr->lock_type= lock_type;
  ptr->updating=    test(table_options & TL_OPTION_UPDATING);
  ptr->force_index= test(table_options & TL_OPTION_FORCE_INDEX);
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  if (use_index)
3361
    ptr->use_index=(List<String> *) thd->memdup((gptr) use_index,
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					       sizeof(*use_index));
  if (ignore_index)
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    ptr->ignore_index=(List<String> *) thd->memdup((gptr) ignore_index,
						   sizeof(*ignore_index));
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  /* check that used name is unique */
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  if (lock_type != TL_IGNORE)
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  {
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    for (TABLE_LIST *tables=(TABLE_LIST*) thd->lex.select->table_list.first ;
	 tables ;
3372
	 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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      {
	net_printf(&thd->net,ER_NONUNIQ_TABLE,alias_str); /* purecov: tested */
	DBUG_RETURN(0);				/* purecov: tested */
      }
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    }
  }
3381
  thd->lex.select->table_list.link_in_list((byte*) ptr,(byte**) &ptr->next);
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  DBUG_RETURN(ptr);
}

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/*
  Set lock for all tables in current select level

  SYNOPSIS:
    set_lock_for_tables()
    lock_type			Lock to set for tables

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

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

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

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

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static bool create_total_list(THD *thd, LEX *lex, TABLE_LIST **result)
3424
{
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  /* Handle the case when we are not using union */
  if (!lex->select_lex.next)
  {
    *result= (TABLE_LIST*) lex->select_lex.table_list.first;
    return 0;
  }

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  SELECT_LEX *sl;
  TABLE_LIST **new_table_list= result, *aux;
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  *new_table_list=0;				// end result list
3436
  for (sl= &lex->select_lex; sl; sl=sl->next)
3437
  {
3438
    if (sl->order_list.first && sl->next && !sl->braces)
3439
    {
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      net_printf(&thd->net,ER_WRONG_USAGE,"UNION","ORDER BY");
      return 1;
3442
    }
3443
    if ((aux= (TABLE_LIST*) sl->table_list.first))
3444
    {
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      TABLE_LIST *next;
      for (; aux; aux=next)
3447
      {
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	TABLE_LIST *cursor;
	next= aux->next;
	for (cursor= *result; cursor; cursor=cursor->next)
	  if (!strcmp(cursor->db,aux->db) &&
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	      !strcmp(cursor->real_name,aux->real_name) &&
3453
	      !strcmp(cursor->alias, aux->alias))
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	    break;
	if (!cursor)
	{
	  /* Add not used table to the total table list */
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	  if (!(cursor = (TABLE_LIST *) thd->memdup((char*) aux,
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						    sizeof(*aux))))
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	  {
	    send_error(&thd->net,0);
	    return 1;
	  }
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	  *new_table_list= cursor;
	  new_table_list= &cursor->next;
3466
	  *new_table_list=0;			// end result list
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	}
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	else
	  aux->shared=1;			// Mark that it's used twice
3470
	aux->table= my_reinterpret_cast(TABLE *) (cursor);
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      }
    }
  }
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  return 0;
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}

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void add_join_on(TABLE_LIST *b,Item *expr)
{
3480
  if (expr)
3481
  {
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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();
3490
  }
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}


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

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

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

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

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

3519
static bool check_dup(const char *db, const char *name, TABLE_LIST *tables)
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{
  for (; tables ; tables=tables->next)
3522
    if (!strcmp(name,tables->real_name) && !strcmp(db,tables->db))
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      return 1;
  return 0;
}

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

3532
bool reload_acl_and_cache(THD *thd, ulong options, TABLE_LIST *tables)
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{
  bool result=0;
3535
  bool error_already_sent=0;
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  select_errors=0;				/* Write if more errors */
  if (options & REFRESH_GRANT)
  {
3539
    acl_reload(thd);
3540
    grant_reload(thd);
3541
    if (mqh_used)
3542
      reset_mqh(thd,(LEX_USER *) NULL,true);
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  }
  if (options & REFRESH_LOG)
  {
3546 3547 3548 3549
    mysql_log.new_file(1);
    mysql_update_log.new_file(1);
    mysql_bin_log.new_file(1);
    mysql_slow_log.new_file(1);
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    if (ha_flush_logs())
      result=1;
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    if (flush_error_log())
      result=1;
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  }
3555
#ifdef HAVE_QUERY_CACHE
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  if (options & REFRESH_QUERY_CACHE_FREE)
  {
3558
    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))
  {
3563
    query_cache.flush();			// RESET QUERY CACHE
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  }
3565
#endif /*HAVE_QUERY_CACHE*/
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  if (options & (REFRESH_TABLES | REFRESH_READ_LOCK))
  {
3568
    if ((options & REFRESH_READ_LOCK) && thd)
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    {
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      if (lock_global_read_lock(thd))
	return 1;
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    }
3573
    result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1, tables);
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  }
  if (options & REFRESH_HOSTS)
    hostname_cache_refresh();
  if (options & REFRESH_STATUS)
    refresh_status();
  if (options & REFRESH_THREADS)
    flush_thread_cache();
  if (options & REFRESH_MASTER)
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    if (reset_master(thd))
      result=1;
3584
#ifdef OPENSSL
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   if (options & REFRESH_DES_KEY_FILE)
   {
     if (des_key_file)
       result=load_des_key_file(des_key_file);
   }
#endif
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 if (options & REFRESH_SLAVE)
 {
   LOCK_ACTIVE_MI;
3594
   if (reset_slave(thd, active_mi))
3595
   {
3596
     result=1;
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     /*
       reset_slave() sends error itself.
       If it didn't, one would either change reset_slave()'s prototype, to
       pass *errorcode and *errmsg to it when it's called or
       change reset_slave to use my_error() to register the error.
     */
     error_already_sent=1;
   }
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   UNLOCK_ACTIVE_MI;
 }
 if (options & REFRESH_USER_RESOURCES)
3608
   reset_mqh(thd,(LEX_USER *) NULL);
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 if (thd && !error_already_sent)
 {
   if (result)
     send_error(&thd->net,0);
   else
     send_ok(&thd->net);
 }

3618
 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
*/

3634
void kill_one_thread(THD *thd, ulong id)
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{
  THD *tmp;
  uint error=ER_NO_SUCH_THREAD;
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  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For unlink from list
  I_List_iterator<THD> it(threads);
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  while ((tmp=it++))
  {
    if (tmp->thread_id == id)
    {
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      pthread_mutex_lock(&tmp->LOCK_delete);	// Lock from delete
      break;
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    }
  }
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
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  if (tmp)
  {
    if ((thd->master_access & SUPER_ACL) ||
	!strcmp(thd->user,tmp->user))
    {
      tmp->awake(1 /*prepare to die*/);
      error=0;
    }
    else
      error=ER_KILL_DENIED_ERROR;
    pthread_mutex_unlock(&tmp->LOCK_delete);
  }

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

/* Clear most status variables */

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

3686
static bool append_file_to_dir(THD *thd, char **filename_ptr, char *table_name)
3687
{
3688
  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);
3701
  end=convert_dirname(buff, *filename_ptr, NullS);
3702
  if (!(ptr=thd->alloc((uint) (end-buff)+(uint) strlen(table_name)+1)))
3703 3704
    return 1;					// End of memory
  *filename_ptr=ptr;
3705
  strxmov(ptr,buff,table_name,NullS);
3706 3707
  return 0;
}
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/*
  Check if the select is a simple select (not an union)

  SYNOPSIS
    check_simple_select()

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

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