sql_parse.cc 98.3 KB
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/* Copyright (C) 2000 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"
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};

bool volatile abort_slave = 0;

#ifdef HAVE_OPENSSL
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extern struct st_VioSSLAcceptorFd * ssl_acceptor_fd;
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#endif /* HAVE_OPENSSL */

#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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inline 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:
  thd->user, thd->master_access, thd->priv_user, thd->db, thd->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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  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, &thd->priv_user,
				 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: %d  Host: '%s'  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->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
  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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static byte* get_key_conn(user_conn *buff, uint *length,
			  my_bool not_used __attribute__((unused)))
{
  *length=buff->len;
  return (byte*) buff->user;
}

static void free_user(struct user_conn *uc)
{
  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, (void (*)(void*)) free_user,
		   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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/*
  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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char  uc_update_queries[SQLCOM_END];

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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=false)
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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))
      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);
      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;
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    thd->ip=0;
    bzero((char*) &thd->remote,sizeof(struct sockaddr));
  }
  vio_keepalive(net->vio, TRUE);

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  ulong pkt_len=0;
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  {
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    /* buff[] needs to big enough to hold the server_version variable */
    char buff[SERVER_VERSION_LENGTH + SCRAMBLE_LENGTH+32],*end;
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    int client_flags = CLIENT_LONG_FLAG | CLIENT_CONNECT_WITH_DB;
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    if (opt_using_transactions)
      client_flags|=CLIENT_TRANSACTIONS;
#ifdef HAVE_COMPRESS
    client_flags |= CLIENT_COMPRESS;
#endif /* HAVE_COMPRESS */
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#ifdef HAVE_OPENSSL
    if (ssl_acceptor_fd)
      client_flags |= CLIENT_SSL;       /* Wow, SSL is avalaible! */
#endif /* HAVE_OPENSSL */
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    end=strnmov(buff,server_version,SERVER_VERSION_LENGTH)+1;
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    int4store((uchar*) end,thd->thread_id);
    end+=4;
    memcpy(end,thd->scramble,SCRAMBLE_LENGTH+1);
    end+=SCRAMBLE_LENGTH +1;
    int2store(end,client_flags);
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    end[2]=(char) MY_CHARSET_CURRENT;
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    int2store(end+3,thd->server_status);
    bzero(end+5,13);
    end+=18;
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    if (net_write_command(net,(uchar) protocol_version, buff,
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			  (uint) (end-buff)) ||
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       (pkt_len= my_net_read(net)) == packet_error ||
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	pkt_len < MIN_HANDSHAKE_SIZE)
    {
      inc_host_errors(&thd->remote.sin_addr);
      return(ER_HANDSHAKE_ERROR);
    }
  }
#ifdef _CUSTOMCONFIG_
#include "_cust_sql_parse.h"
#endif
  if (connect_errors)
    reset_host_errors(&thd->remote.sin_addr);
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  if (thd->packet.alloc(thd->variables.net_buffer_length))
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    return(ER_OUT_OF_RESOURCES);

  thd->client_capabilities=uint2korr(net->read_pos);
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  if (thd->client_capabilities & CLIENT_IGNORE_SPACE)
    thd->sql_mode|= MODE_IGNORE_SPACE;
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#ifdef HAVE_OPENSSL
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  DBUG_PRINT("info", ("client capabilities: %d", thd->client_capabilities));
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  if (thd->client_capabilities & CLIENT_SSL)
  {
    /* Do the SSL layering. */
    DBUG_PRINT("info", ("IO layer change in progress..."));
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    sslaccept(ssl_acceptor_fd, net->vio, thd->variables.net_wait_timeout);
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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 (passwd[0] && strlen(passwd) != SCRAMBLE_LENGTH)
    return ER_HANDSHAKE_ERROR;
  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);
  thd->password=test(passwd[0]);
  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)
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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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    if ((ulong) thd->variables.max_join_size == (ulong) 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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      thread_safe_increment(aborted_threads,&LOCK_status);
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    }
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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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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)
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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 ((ulong) thd->variables.max_join_size == (ulong) 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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}


763
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;
  table_list->real_name = table_list->name = tbl_name;
  table_list->lock_type = TL_READ_NO_INSERT;
  table_list->next = 0;
  remove_escape(table_list->real_name);
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  if (!(table=open_ltable(thd, table_list, TL_READ_NO_INSERT)))
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    DBUG_RETURN(1);

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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 (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)))
    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 reading command from socket %s",
			vio_description(net->vio) ));
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    return TRUE;
  }
  else
  {
    packet=(char*) net->read_pos;
    command = (enum enum_server_command) (uchar) packet[0];
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    DBUG_PRINT("info",("Command on %s = %d (%s)",
		       vio_description(net->vio), command,
		       command_name[command]));
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  }
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  net->read_timeout=old_timeout;		// restore it
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  DBUG_RETURN(dispatch_command(command,thd, packet+1, (uint) packet_length));
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}


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

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  thd->command=command;
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  thd->set_time();
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  VOID(pthread_mutex_lock(&LOCK_thread_count));
  thd->query_id=query_id;
  if (command != COM_STATISTICS && command != COM_PING)
    query_id++;
  thread_running++;
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
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  thd->lex.select_lex.options=0;		// We store status here
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  switch (command) {
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  case COM_INIT_DB:
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    thread_safe_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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      thread_safe_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
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      break;
    }
  case COM_CHANGE_USER:
  {
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    thread_safe_increment(com_other,&LOCK_status);
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    char *user=   (char*) packet;
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    char *passwd= strend(user)+1;
    char *db=     strend(passwd)+1;

    /* Save user and privileges */
    uint save_master_access=thd->master_access;
    uint save_db_access=    thd->db_access;
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    uint save_db_length=    thd->db_length;
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    char *save_user=	    thd->user;
    char *save_priv_user=   thd->priv_user;
    char *save_db=	    thd->db;
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    USER_CONN *save_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;
    }
929
    if (check_user(thd, COM_CHANGE_USER, user, passwd, db, 0))
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    {						// Restore old user
      x_free(thd->user);
      x_free(thd->db);
      thd->master_access=save_master_access;
      thd->db_access=save_db_access;
      thd->db=save_db;
936
      thd->db_length=save_db_length;
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      thd->user=save_user;
      thd->priv_user=save_priv_user;
      break;
    }
941
    if (max_connections && save_uc)
942
      decrease_user_connections(save_uc);
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    x_free((gptr) save_db);
    x_free((gptr) save_user);
    thd->password=test(passwd[0]);
    break;
  }

  case COM_QUERY:
  {
951 952 953 954 955 956 957 958
    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
959
    while (packet_length > 0 && (pos[-1] == ';' || isspace(pos[-1])))
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    {
      pos--;
      packet_length--;
    }
964
    /* We must allocate some extra memory for query cache */
965
    if (!(thd->query= (char*) thd->memdup_w_gap((gptr) (packet),
966 967
						packet_length,
						thd->db_length+2)))
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      break;
969
    thd->query[packet_length]=0;
970
    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);
973
    mysql_log.write(thd,command,"%s",thd->query);
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    DBUG_PRINT("query",("%s",thd->query));
975 976
    /* 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;
  }
982
  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;
990
    thread_safe_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;
998
    table_list.name=table_list.real_name=thd->strdup(packet);
999
    packet=strend(packet)+1;
1000
    // command not cachable => no gap for data base name
1001 1002
    if (!(thd->query=fields=thd->memdup(packet,thd->query_length+1)))
      break;
1003
    mysql_log.write(thd,command,"%s %s",table_list.real_name,fields);
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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:
1017
    /* We don't calculate statistics for this command */
1018
    mysql_log.write(thd,command,NullS);
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    net->error=0;				// Don't give 'abort' message
    error=TRUE;					// End server
    break;

1023
  case COM_CREATE_DB:				// QQ: To be removed
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    {
1025
      thread_safe_increment(com_stat[SQLCOM_CREATE_DB],&LOCK_status);
1026
      char *db=thd->strdup(packet);
1027
      // null test to handle EOM
1028
      if (!db || !strip_sp(db) || check_db_name(db))
1029 1030 1031 1032
      {
	net_printf(&thd->net,ER_WRONG_DB_NAME, db ? db : "NULL");
	break;
      }
1033 1034
      if (lower_case_table_names)
	casedn_str(db);
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      if (check_access(thd,CREATE_ACL,db,0,1))
	break;
1037
      mysql_log.write(thd,command,packet);
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      mysql_create_db(thd,db,0,0);
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      break;
    }
1041
  case COM_DROP_DB:				// QQ: To be removed
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    {
1043
      thread_safe_increment(com_stat[SQLCOM_DROP_DB],&LOCK_status);
1044
      char *db=thd->strdup(packet);
1045
      // null test to handle EOM
1046
      if (!db || !strip_sp(db) || check_db_name(db))
1047 1048 1049 1050
      {
	net_printf(&thd->net,ER_WRONG_DB_NAME, db ? db : "NULL");
	break;
      }
1051 1052
      if (lower_case_table_names)
	casedn_str(db);
1053 1054 1055
      if (thd->locked_tables || thd->active_transaction())
      {
	send_error(&thd->net,ER_LOCK_OR_ACTIVE_TRANSACTION);
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	break;
1057
      }
1058
      mysql_log.write(thd,command,db);
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1059
      mysql_rm_db(thd,db,0,0);
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      break;
    }
  case COM_BINLOG_DUMP:
    {
1064
      thread_safe_increment(com_other,&LOCK_status);
1065
      slow_command = TRUE;
1066
      if (check_global_access(thd, REPL_SLAVE_ACL))
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	break;
1068
      mysql_log.write(thd,command, 0);
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      ulong pos;
      ushort flags;
1072
      uint32 slave_server_id;
1073
      /* TODO: The following has to be changed to an 8 byte integer */
1074 1075
      pos = uint4korr(packet);
      flags = uint2korr(packet + 4);
1076
      thd->server_id=0; /* avoid suicide */
1077
      kill_zombie_dump_threads(slave_server_id = uint4korr(packet+6));
1078
      thd->server_id = slave_server_id;
1079
      mysql_binlog_send(thd, thd->strdup(packet + 10), (my_off_t) pos, flags);
1080
      unregister_slave(thd,1,1);
1081 1082 1083
      // 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:
    {
1088
      thread_safe_increment(com_stat[SQLCOM_FLUSH],&LOCK_status);
1089
      ulong options= (ulong) (uchar) packet[0];
1090
      if (check_global_access(thd,RELOAD_ACL))
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	break;
1092
      mysql_log.write(thd,command,NullS);
1093
      if (reload_acl_and_cache(thd, options, (TABLE_LIST*) 0))
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	send_error(net,0);
      else
	send_eof(net);
      break;
    }
  case COM_SHUTDOWN:
1100
    thread_safe_increment(com_other,&LOCK_status);
1101
    if (check_global_access(thd,SHUTDOWN_ACL))
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      break; /* purecov: inspected */
    DBUG_PRINT("quit",("Got shutdown command"));
1104
    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
1114
    free_root(&thd->mem_root,MYF(0));
1115
    free_root(&thd->transaction.mem_root,MYF(0));
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    kill_mysql();
    error=TRUE;
    break;

  case COM_STATISTICS:
  {
1122
    mysql_log.write(thd,command,NullS);
1123
    thread_safe_increment(com_stat[SQLCOM_SHOW_STATUS],&LOCK_status);
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    char buff[200];
1125
    ulong uptime = (ulong) (thd->start_time - start_time);
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    sprintf((char*) buff,
1127
	    "Uptime: %ld  Threads: %d  Questions: %lu  Slow queries: %ld  Opens: %ld  Flush tables: %ld  Open tables: %u  Queries per second avg: %.3f",
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	    uptime,
	    (int) thread_count,thd->query_id,long_query_count,
	    opened_tables,refresh_version, cached_tables(),
	    uptime ? (float)thd->query_id/(float)uptime : 0);
#ifdef SAFEMALLOC
    if (lCurMemory)				// Using SAFEMALLOC
      sprintf(strend(buff), "  Memory in use: %ldK  Max memory used: %ldK",
	      (lCurMemory+1023L)/1024L,(lMaxMemory+1023L)/1024L);
 #endif
1137
    VOID(my_net_write(net, buff,(uint) strlen(buff)));
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    VOID(net_flush(net));
    break;
  }
  case COM_PING:
1142
    thread_safe_increment(com_other,&LOCK_status);
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    send_ok(net);				// Tell client we are alive
    break;
  case COM_PROCESS_INFO:
1146
    thread_safe_increment(com_stat[SQLCOM_SHOW_PROCESSLIST],&LOCK_status);
1147
    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
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      break;
1149
    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:
  {
1155
    thread_safe_increment(com_stat[SQLCOM_KILL],&LOCK_status);
1156
    ulong id=(ulong) uint4korr(packet);
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    kill_one_thread(thd,id);
    break;
  }
  case COM_DEBUG:
1161
    thread_safe_increment(com_other,&LOCK_status);
1162
    if (check_global_access(thd, SUPER_ACL))
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      break;					/* purecov: inspected */
    mysql_print_status(thd);
1165
    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:
  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;
1186
  thd->end_time();				// Set start time
1187

1188
  /* If not reading from backup and if the query took too long */
1189
  if (!slow_command && !thd->user_time) // do not log 'slow_command' queries
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  {
1191 1192
    thd->proc_info="logging slow query";

1193 1194
    if ((ulong) (thd->start_time - thd->time_after_lock) >
	thd->variables.long_query_time ||
1195
	((thd->lex.select_lex.options &
1196
	  (QUERY_NO_INDEX_USED | QUERY_NO_GOOD_INDEX_USED)) &&
1197
	 (specialflag & SPECIAL_LONG_LOG_FORMAT)))
1198 1199 1200 1201
    {
      long_query_count++;
      mysql_slow_log.write(thd, thd->query, thd->query_length, start_of_query);
    }
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  }
1203
  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));
1210
  thd->packet.shrink(thd->variables.net_buffer_length);	// Reclaim some memory
1211
  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;
1225
  LEX	*lex= &thd->lex;
1226
  TABLE_LIST *tables=(TABLE_LIST*) lex->select_lex.table_list.first;
1227
  SELECT_LEX *select_lex = lex->select;
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  DBUG_ENTER("mysql_execute_command");

1230 1231
  if (thd->slave_thread)
  {
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merge  
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1232 1233 1234 1235 1236
    /* 
      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))
1237
      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()
    */
1244 1245 1246
    if (lex->sql_command == SQLCOM_SELECT)
    {
      lex->sql_command = SQLCOM_DO;
1247
      lex->insert_list = &select_lex->item_list;
1248
    }
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#endif
1250
  }
1251
  
1252 1253 1254 1255
  /*
    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)))
1259
    DBUG_VOID_RETURN;
1260

1261
  thread_safe_increment(com_stat[lex->sql_command],&LOCK_status);
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  switch (lex->sql_command) {
  case SQLCOM_SELECT:
  {
    select_result *result;
1266
    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
    }

1284 1285 1286
    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
1288
    if (thd->select_limit == HA_POS_ERROR)
1289
      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
1314 1315
      delete select_lex->having;
      delete select_lex->where;
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#endif
      break;
    }
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    else
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    {
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      /*
	Normal select:
	Change lock if we are using SELECT HIGH PRIORITY,
	FOR UPDATE or IN SHARE MODE
      */
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      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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    {
1333
      query_cache_store_query(thd, tables);
1334
      res=handle_select(thd, lex, result);
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    }
1336 1337
    else
      delete result;
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    break;
  }
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  case SQLCOM_DO:
    res=mysql_do(thd, *lex->insert_list);
    break;

1344 1345 1346 1347
  case SQLCOM_EMPTY_QUERY:
    send_ok(&thd->net);
    break;

1348
  case SQLCOM_PURGE:
1349
  {
1350
    if (check_global_access(thd, SUPER_ACL))
1351 1352 1353 1354
      goto error;
    res = purge_master_logs(thd, lex->to_log);
    break;
  }
1355 1356
  case SQLCOM_SHOW_NEW_MASTER:
  {
1357
    if (check_global_access(thd, REPL_SLAVE_ACL))
1358 1359 1360 1361
      goto error;
    res = show_new_master(thd);
    break;
  }
1362 1363
  case SQLCOM_SHOW_SLAVE_HOSTS:
  {
1364
    if (check_global_access(thd, REPL_SLAVE_ACL))
1365 1366 1367 1368
      goto error;
    res = show_slave_hosts(thd);
    break;
  }
1369 1370
  case SQLCOM_SHOW_BINLOG_EVENTS:
  {
1371
    if (check_global_access(thd, REPL_SLAVE_ACL))
1372 1373 1374 1375
      goto error;
    res = show_binlog_events(thd);
    break;
  }
1376
  case SQLCOM_BACKUP_TABLE:
1377 1378 1379
  {
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL, tables) ||
1380
	check_global_access(thd, FILE_ACL))
1381 1382
      goto error; /* purecov: inspected */
    res = mysql_backup_table(thd, tables);
1383

1384 1385
    break;
  }
1386
  case SQLCOM_RESTORE_TABLE:
1387 1388
  {
    if (check_db_used(thd,tables) ||
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	check_table_access(thd, INSERT_ACL, tables) ||
	check_global_access(thd, FILE_ACL))
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      goto error; /* purecov: inspected */
    res = mysql_restore_table(thd, tables);
    break;
  }
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  case SQLCOM_CHANGE_MASTER:
1396
  {
1397
    if (check_global_access(thd, SUPER_ACL))
1398
      goto error;
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    LOCK_ACTIVE_MI;
    res = change_master(thd,active_mi);
    UNLOCK_ACTIVE_MI;
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    break;
  }
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  case SQLCOM_SHOW_SLAVE_STAT:
1405
  {
1406
    if (check_global_access(thd, SUPER_ACL))
1407
      goto error;
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    LOCK_ACTIVE_MI;
    res = show_master_info(thd,active_mi);
    UNLOCK_ACTIVE_MI;
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    break;
  }
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  case SQLCOM_SHOW_MASTER_STAT:
1414
  {
1415
    if (check_global_access(thd, SUPER_ACL))
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      goto error;
    res = show_binlog_info(thd);
    break;
  }
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  case SQLCOM_LOAD_MASTER_DATA: // sync with master
1422
    if (check_global_access(thd, SUPER_ACL))
1423
      goto error;
1424 1425 1426 1427
    if (end_active_trans(thd))
      res= -1;
    else
      res = load_master_data(thd);
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    break;
    
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#ifdef HAVE_INNOBASE_DB
  case SQLCOM_SHOW_INNODB_STATUS:
    {
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      if (check_global_access(thd, SUPER_ACL))
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	goto error;
      res = innodb_show_status(thd);
      break;
    }
#endif
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  case SQLCOM_LOAD_MASTER_TABLE:
1441
  {
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    if (!tables->db)
      tables->db=thd->db;
    if (check_access(thd,CREATE_ACL,tables->db,&tables->grant.privilege))
      goto error;				/* purecov: inspected */
    if (grant_option)
    {
      /* Check that the first table has CREATE privilege */
      TABLE_LIST *tmp_table_list=tables->next;
      tables->next=0;
      bool error=check_grant(thd,CREATE_ACL,tables);
      tables->next=tmp_table_list;
      if (error)
1454
	goto error;
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    }
    if (strlen(tables->name) > NAME_LEN)
    {
      net_printf(&thd->net,ER_WRONG_TABLE_NAME,tables->name);
      break;
    }
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    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;
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  }
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  case SQLCOM_CREATE_TABLE:
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  {
    ulong want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
		      CREATE_TMP_ACL : CREATE_ACL);
1475 1476
    if (!tables->db)
      tables->db=thd->db;
1477
    if (check_access(thd,want_priv,tables->db,&tables->grant.privilege) ||
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	check_merge_table_access(thd, tables->db,
				 (TABLE_LIST *)
				 lex->create_info.merge_list.first))
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      goto error;				/* purecov: inspected */
1482
    if (grant_option && want_priv != CREATE_TMP_ACL)
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    {
      /* Check that the first table has CREATE privilege */
      TABLE_LIST *tmp_table_list=tables->next;
      tables->next=0;
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      bool error=check_grant(thd, want_priv, tables);
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      tables->next=tmp_table_list;
      if (error)
	goto error;
    }
    if (strlen(tables->name) > NAME_LEN)
    {
      net_printf(&thd->net,ER_WRONG_TABLE_NAME,tables->name);
      res=0;
      break;
    }
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#ifndef HAVE_READLINK
    lex->create_info.data_file_name=lex->create_info.index_file_name=0;
#else
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    /* Fix names if symlinked tables */
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    if (append_file_to_dir(thd, &lex->create_info.data_file_name,
			   tables->name) ||
	append_file_to_dir(thd,&lex->create_info.index_file_name,
			   tables->name))
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    {
      res=-1;
      break;
    }
1510
#endif
1511
    if (select_lex->item_list.elements)		// With select
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    {
      select_result *result;

      if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
1516
	  check_dup(tables->db, tables->real_name, tables->next))
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      {
	net_printf(&thd->net,ER_INSERT_TABLE_USED,tables->real_name);
	DBUG_VOID_RETURN;
      }
      if (tables->next)
      {
1523
	TABLE_LIST *table;
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	if (check_table_access(thd, SELECT_ACL, tables->next))
	  goto error;				// Error message is given
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	for (table = tables->next ; table ; table=table->next)
	  table->lock_type= lex->lock_option;
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      }
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      thd->offset_limit=select_lex->offset_limit;
      thd->select_limit=select_lex->select_limit+select_lex->offset_limit;
      if (thd->select_limit < select_lex->select_limit)
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	thd->select_limit= HA_POS_ERROR;		// No limit
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      /* Skip first table, which is the table we are creating */
      lex->select_lex.table_list.first=
	(byte*) (((TABLE_LIST *) lex->select_lex.table_list.first)->next);
      if (!(res=open_and_lock_tables(thd,tables->next)))
      {
        if ((result=new select_create(tables->db ? tables->db : thd->db,
                                      tables->real_name, &lex->create_info,
                                      lex->create_list,
                                      lex->key_list,
                                      select_lex->item_list,lex->duplicates)))
          res=handle_select(thd, lex, result);
	else
	  res= -1;
      }
    }
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    else // regular create
    {
      res = mysql_create_table(thd,tables->db ? tables->db : thd->db,
			       tables->real_name, &lex->create_info,
			       lex->create_list,
			       lex->key_list,0, 0); // do logging
      if (!res)
	send_ok(&thd->net);
    }
    break;
1559
  }
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  case SQLCOM_CREATE_INDEX:
    if (!tables->db)
      tables->db=thd->db;
    if (check_access(thd,INDEX_ACL,tables->db,&tables->grant.privilege))
      goto error; /* purecov: inspected */
    if (grant_option && check_grant(thd,INDEX_ACL,tables))
      goto error;
1567 1568 1569 1570
    if (end_active_trans(thd))
      res= -1;
    else
      res = mysql_create_index(thd, tables, lex->key_list);
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    break;

  case SQLCOM_SLAVE_START:
1574 1575 1576 1577
  {
    LOCK_ACTIVE_MI;
    start_slave(thd,active_mi,1 /* net report*/);
    UNLOCK_ACTIVE_MI;
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    break;
1579
  }
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  case SQLCOM_SLAVE_STOP:
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  {
    LOCK_ACTIVE_MI;
    stop_slave(thd,active_mi,1/* net report*/);
    UNLOCK_ACTIVE_MI;
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    break;
1586
  }
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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
    {
1593
      ulong priv=0;
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      if (lex->name && strlen(lex->name) > NAME_LEN)
      {
	net_printf(&thd->net,ER_WRONG_TABLE_NAME,lex->name);
	res=0;
	break;
      }
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      if (!tables->db)
	tables->db=thd->db;
1602 1603
      if (!select_lex->db)
	select_lex->db=tables->db;
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      if (check_access(thd,ALTER_ACL,tables->db,&tables->grant.privilege) ||
1605
	  check_access(thd,INSERT_ACL | CREATE_ACL,select_lex->db,&priv) ||
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	  check_merge_table_access(thd, tables->db, 
				   (TABLE_LIST *)
				   lex->create_info.merge_list.first))
	goto error;				/* purecov: inspected */
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      if (!tables->db)
	tables->db=thd->db;
      if (grant_option)
      {
	if (check_grant(thd,ALTER_ACL,tables))
	  goto error;
	if (lex->name && !test_all_bits(priv,INSERT_ACL | CREATE_ACL))
	{					// Rename of table
	  TABLE_LIST tmp_table;
	  bzero((char*) &tmp_table,sizeof(tmp_table));
	  tmp_table.real_name=lex->name;
1621
	  tmp_table.db=select_lex->db;
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	  tmp_table.grant.privilege=priv;
	  if (check_grant(thd,INSERT_ACL | CREATE_ACL,tables))
	    goto error;
	}
      }
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      /* Don't yet allow changing of symlinks with ALTER TABLE */
      lex->create_info.data_file_name=lex->create_info.index_file_name=0;
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      /* ALTER TABLE ends previous transaction */
1630
      if (end_active_trans(thd))
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	res= -1;
      else
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      {
1634
	res= mysql_alter_table(thd, select_lex->db, lex->name,
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			       &lex->create_info,
			       tables, lex->create_list,
			       lex->key_list, lex->drop_list, lex->alter_list,
1638
                               (ORDER *) select_lex->order_list.first,
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			       lex->drop_primary, lex->duplicates,
			       lex->alter_keys_onoff, lex->simple_alter);
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      }
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      break;
    }
#endif
1645
  case SQLCOM_RENAME_TABLE:
1646 1647 1648
  {
    TABLE_LIST *table;
    if (check_db_used(thd,tables))
1649
      goto error;
1650 1651
    for (table=tables ; table ; table=table->next->next)
    {
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      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
		       &table->grant.privilege) ||
1654 1655 1656 1657 1658
	  check_access(thd, INSERT_ACL | CREATE_ACL, table->next->db,
		       &table->next->grant.privilege))
	goto error;
      if (grant_option)
      {
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	TABLE_LIST old_list,new_list;
	old_list=table[0];
	new_list=table->next[0];
	old_list.next=new_list.next=0;
	if (check_grant(thd,ALTER_ACL,&old_list) ||
1664
	    (!test_all_bits(table->next->grant.privilege,
1665
			    INSERT_ACL | CREATE_ACL) &&
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	     check_grant(thd,INSERT_ACL | CREATE_ACL, &new_list)))
1667 1668 1669
	  goto error;
      }
    }
1670
    query_cache_invalidate3(thd, tables, 0);
1671 1672 1673
    if (end_active_trans(thd))
      res= -1;
    else if (mysql_rename_tables(thd,tables))
1674 1675
      res= -1;
    break;
1676
  }
1677 1678 1679 1680 1681 1682
  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
    DBUG_VOID_RETURN;
#else
    {
1683
      if (check_global_access(thd, SUPER_ACL))
1684 1685 1686 1687 1688
	goto error;
      res = show_binlogs(thd);
      break;
    }
#endif    
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  case SQLCOM_SHOW_CREATE:
1690
#ifdef DONT_ALLOW_SHOW_COMMANDS
1691
    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
1692 1693
    DBUG_VOID_RETURN;
#else
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    {
1695 1696 1697 1698
      if (check_db_used(thd, tables) ||
	  check_access(thd, SELECT_ACL | EXTRA_ACL, tables->db,
		       &tables->grant.privilege))
	goto error;
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      res = mysqld_show_create(thd, tables);
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      break;
    }
1702
#endif
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  case SQLCOM_REPAIR:
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  {
    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:
1712 1713 1714 1715 1716 1717 1718
  {
    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:
  {
1721 1722
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables))
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      goto error; /* purecov: inspected */
1724
    res = mysql_analyze_table(thd, tables, &lex->check_opt);
1725
    break;
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  }
1727

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  case SQLCOM_OPTIMIZE:
  {
    HA_CREATE_INFO create_info;
1731 1732
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables))
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      goto error; /* purecov: inspected */
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    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,
1748
                             (ORDER *) 0,
1749 1750 1751 1752
			     0,DUP_ERROR);
    }
    else
      res = mysql_optimize_table(thd, tables, &lex->check_opt);
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    break;
  }
  case SQLCOM_UPDATE:
    if (check_access(thd,UPDATE_ACL,tables->db,&tables->grant.privilege))
      goto error;
    if (grant_option && check_grant(thd,UPDATE_ACL,tables))
      goto error;
1760
    if (select_lex->item_list.elements != lex->value_list.elements)
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    {
      send_error(&thd->net,ER_WRONG_VALUE_COUNT);
      DBUG_VOID_RETURN;
    }
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    if (select_lex->table_list.elements == 1)
    {
      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,
			 lex->lock_option);
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#ifdef DELETE_ITEMS
1777
      delete select_lex->where;
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#endif
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    }
    else 
    {
      multi_update  *result;
      uint table_count;
      TABLE_LIST *auxi;
1785 1786
      const char *msg=0;

1787 1788 1789 1790 1791 1792
      lex->sql_command=SQLCOM_MULTI_UPDATE;
      for (auxi=(TABLE_LIST*) tables, table_count=0 ; auxi ; auxi=auxi->next)
      {
	table_count++;
	auxi->lock_type=TL_WRITE;
      }
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      if (select_lex->order_list.elements)
	msg="ORDER BY";
      else if (select_lex->select_limit && select_lex->select_limit !=
	       HA_POS_ERROR)
	msg="LIMIT";

      if (msg)
1800
      {
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	net_printf(&thd->net, ER_WRONG_USAGE, "UPDATE", msg);
	res= 1;
	break;
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      }
      tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
      if ((res=open_and_lock_tables(thd,tables)))
	break;
1808
      thd->select_limit=HA_POS_ERROR;
1809
      if (!setup_fields(thd,tables,select_lex->item_list,1,0,0) && 
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	  !setup_fields(thd,tables,lex->value_list,0,0,0) &&
	  ! thd->fatal_error &&
	  (result=new multi_update(thd,tables,select_lex->item_list,
				   lex->duplicates, lex->lock_option,
				   table_count)))
1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838
      {
	List <Item> total_list;
	List_iterator <Item> field_list(select_lex->item_list);
	List_iterator <Item> value_list(lex->value_list);
	Item *item;
	while ((item=field_list++))
	  total_list.push_back(item);
	while ((item=value_list++))
	  total_list.push_back(item);
	
	res=mysql_select(thd,tables,total_list,
			 select_lex->where,
			 (ORDER *)NULL,(ORDER *)NULL,(Item *)NULL,
			 (ORDER *)NULL,
			 select_lex->options | thd->options |
			 SELECT_NO_JOIN_CACHE,
			 result);
	delete result;
      }
      else
	res= -1;					// Error is not sent
      close_thread_tables(thd);
    }
    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,
		       lex->duplicates,
		       lex->lock_option);
    break;
  case SQLCOM_REPLACE:
    if (check_access(thd,INSERT_ACL | UPDATE_ACL | DELETE_ACL,
		     tables->db,&tables->grant.privilege))
      goto error; /* purecov: inspected */
    if (grant_option && check_grant(thd,INSERT_ACL | UPDATE_ACL | DELETE_ACL,
				    tables))

      goto error;
    res = mysql_insert(thd,tables,lex->field_list,lex->many_values,
		       DUP_REPLACE,
		       lex->lock_option);
    break;
  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
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1864 1865 1866 1867
    /*
      Check that we have modify privileges for the first table and
      select privileges for the rest
    */
1868
    {
1869 1870
      ulong privilege= (lex->sql_command == SQLCOM_INSERT_SELECT ?
			INSERT_ACL : INSERT_ACL | UPDATE_ACL | DELETE_ACL);
1871 1872 1873 1874 1875 1876 1877 1878 1879 1880
      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;
    }
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    select_result *result;
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    thd->offset_limit=select_lex->offset_limit;
    thd->select_limit=select_lex->select_limit+select_lex->offset_limit;
    if (thd->select_limit < select_lex->select_limit)
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1886 1887
      thd->select_limit= HA_POS_ERROR;		// No limit

1888
    if (check_dup(tables->db, tables->real_name, tables->next))
1889 1890 1891
    {
      net_printf(&thd->net,ER_INSERT_TABLE_USED,tables->real_name);
      DBUG_VOID_RETURN;
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    }
1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905
    tables->lock_type=TL_WRITE;		// update first table
    {
      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,
1906
				    lex->duplicates)))
1907 1908 1909 1910
	res=handle_select(thd,lex,result);
    }
    else
      res= -1;
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    break;
  }
1913
  case SQLCOM_TRUNCATE:
1914 1915 1916 1917 1918 1919 1920 1921
    if (check_access(thd,DELETE_ACL,tables->db,&tables->grant.privilege))
      goto error; /* purecov: inspected */
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
    if (thd->locked_tables || thd->active_transaction())
    {
1922
      send_error(&thd->net,ER_LOCK_OR_ACTIVE_TRANSACTION,NullS);
1923 1924 1925 1926
      goto error;
    }
    res=mysql_truncate(thd,tables);
    break;
1927
  case SQLCOM_DELETE:
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  {
    if (check_access(thd,DELETE_ACL,tables->db,&tables->grant.privilege))
      goto error; /* purecov: inspected */
    if (grant_option && check_grant(thd,DELETE_ACL,tables))
      goto error;
    // Set privilege for the WHERE clause
    tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
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    res = mysql_delete(thd,tables, select_lex->where,
                       (ORDER*) select_lex->order_list.first,
                       select_lex->select_limit, lex->lock_option,
                       select_lex->options);
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    break;
  }
1941
  case SQLCOM_DELETE_MULTI:
1942 1943 1944 1945 1946
  {
    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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1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975
    /* 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;
      }
      auxi->lock_type=walk->lock_type=TL_WRITE;
      auxi->table= (TABLE *) walk;		// Remember corresponding table
1976 1977 1978 1979 1980
    }
    if (add_item_to_list(new Item_null()))
    {
      res = -1;
      break;
1981 1982 1983 1984 1985 1986 1987 1988
    }
    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)
      auxi->table= ((TABLE_LIST*) auxi->table)->table;
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    if (!thd->fatal_error && (result= new multi_delete(thd,aux_tables,
						       lex->lock_option,
						       table_count)))
1992 1993
    {
      res=mysql_select(thd,tables,select_lex->item_list,
1994
		       select_lex->where,
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		       (ORDER *)NULL,(ORDER *)NULL,(Item *)NULL,
		       (ORDER *)NULL,
		       select_lex->options | thd->options |
		       SELECT_NO_JOIN_CACHE,
		       result);
2000
      delete result;
2001 2002 2003 2004 2005 2006
    }
    else
      res= -1;					// Error is not sent
    close_thread_tables(thd);
    break;
  }
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2007
  case SQLCOM_DROP_TABLE:
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  {
    if (check_table_access(thd,DROP_ACL,tables))
      goto error;				/* purecov: inspected */
    if (end_active_trans(thd))
      res= -1;
    else
      res = mysql_rm_table(thd,tables,lex->drop_if_exists);
  }
  break;
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  case SQLCOM_DROP_INDEX:
    if (!tables->db)
      tables->db=thd->db;
    if (check_access(thd,INDEX_ACL,tables->db,&tables->grant.privilege))
      goto error;				/* purecov: inspected */
    if (grant_option && check_grant(thd,INDEX_ACL,tables))
      goto error;
2024 2025 2026 2027
    if (end_active_trans(thd))
      res= -1;
    else
      res = mysql_drop_index(thd, tables, lex->drop_list);
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2028 2029
    break;
  case SQLCOM_SHOW_DATABASES:
2030
#if defined(DONT_ALLOW_SHOW_COMMANDS)
2031
    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND);   /* purecov: inspected */
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    DBUG_VOID_RETURN;
#else
    if ((specialflag & SPECIAL_SKIP_SHOW_DB) &&
2035
	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:
2041
    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
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2042 2043 2044 2045 2046
      break;
    mysqld_list_processes(thd,thd->master_access & PROCESS_ACL ? NullS :
			  thd->priv_user,lex->verbose);
    break;
  case SQLCOM_SHOW_STATUS:
2047
    res= mysqld_show(thd,(lex->wild ? lex->wild->ptr() : NullS),status_vars,
2048
		     OPT_GLOBAL);
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    break;
  case SQLCOM_SHOW_VARIABLES:
    res= mysqld_show(thd, (lex->wild ? lex->wild->ptr() : NullS),
2052
		     init_vars, lex->option_type);
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2053
    break;
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2054
  case SQLCOM_SHOW_LOGS:
2055 2056 2057 2058
  {
    res= mysqld_show_logs(thd);
    break;
  }
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2059
  case SQLCOM_SHOW_TABLES:
2060
    /* 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
    {
2066
      char *db=select_lex->db ? select_lex->db : thd->db;
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      if (!db)
      {
	send_error(&thd->net,ER_NO_DB_ERROR);	/* purecov: inspected */
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);				// Fix escaped '_'
2073
      if (check_db_name(db))
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      {
2075 2076
        net_printf(&thd->net,ER_WRONG_DB_NAME, db);
        goto error;
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      }
      if (check_access(thd,SELECT_ACL,db,&thd->col_access))
	goto error;				/* purecov: inspected */
      /* grant is checked in mysqld_show_tables */
2081
      if (select_lex->options & SELECT_DESCRIBE)
2082
        res= mysqld_extend_show_tables(thd,db,
2083
				       (lex->wild ? lex->wild->ptr() : NullS));
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      else
	res= mysqld_show_tables(thd,db,
				(lex->wild ? lex->wild->ptr() : NullS));
      break;
    }
#endif
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  case SQLCOM_SHOW_OPEN_TABLES:
    res= mysqld_show_open_tables(thd,(lex->wild ? lex->wild->ptr() : NullS));
    break;
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  case SQLCOM_SHOW_FIELDS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
    DBUG_VOID_RETURN;
#else
    {
2099 2100
      char *db=tables->db;
      if (!*db)
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      {
	send_error(&thd->net,ER_NO_DB_ERROR);	/* purecov: inspected */
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);			// Fix escaped '_'
      remove_escape(tables->name);
      if (check_access(thd,SELECT_ACL | EXTRA_ACL,db,&thd->col_access))
	goto error;				/* purecov: inspected */
      tables->grant.privilege=thd->col_access;
      if (grant_option && check_grant(thd,SELECT_ACL,tables,2))
	goto error;
      res= mysqld_show_fields(thd,tables,
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			      (lex->wild ? lex->wild->ptr() : NullS),
			      lex->verbose);
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      break;
    }
#endif
  case SQLCOM_SHOW_KEYS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
    DBUG_VOID_RETURN;
#else
    {
2124
      char *db=tables->db;
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      if (!db)
      {
	send_error(&thd->net,ER_NO_DB_ERROR);	/* purecov: inspected */
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);			// Fix escaped '_'
      remove_escape(tables->name);
      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:
2144
    mysql_change_db(thd,select_lex->db);
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    break;
  case SQLCOM_LOAD:
  {
    uint privilege= (lex->duplicates == DUP_REPLACE ?
		     INSERT_ACL | UPDATE_ACL | DELETE_ACL : INSERT_ACL);
2150 2151

    if (!lex->local_file)
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    {
      if (check_access(thd,privilege | FILE_ACL,tables->db))
	goto error;
    }
    else
    {
2158
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
2159
	  ! opt_local_infile)
2160 2161 2162 2163
      {
	send_error(&thd->net,ER_NOT_ALLOWED_COMMAND);
	goto error;
      }
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      if (check_access(thd,privilege,tables->db,&tables->grant.privilege) ||
2165
	  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:
2173 2174 2175 2176
    if (sql_set_variables(thd, &lex->var_list))
      res= -1;
    else
      send_ok(&thd->net);
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    break;
  case SQLCOM_UNLOCK_TABLES:
    if (thd->locked_tables)
    {
      thd->lock=thd->locked_tables;
      thd->locked_tables=0;			// Will be automaticly closed
2183 2184 2185
    }
    if (thd->options & OPTION_TABLE_LOCK)
    {
2186
      end_active_trans(thd);
2187
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
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    }
    if (thd->global_read_lock)
2190
      unlock_global_read_lock(thd);
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    send_ok(&thd->net);
    break;
  case SQLCOM_LOCK_TABLES:
    if (thd->locked_tables)
    {
      thd->lock=thd->locked_tables;
      thd->locked_tables=0;			// Will be automaticly closed
      close_thread_tables(thd);
    }
2200
    if (check_db_used(thd,tables) || end_active_trans(thd))
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      goto error;
2202
    if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, tables))
2203
      goto error;
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    thd->in_lock_tables=1;
2205
    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);
    }
2212 2213
    else
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
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    thd->in_lock_tables=0;
    break;
  case SQLCOM_CREATE_DB:
2217
  {
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2218
    if (!strip_sp(lex->name) || check_db_name(lex->name))
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    {
2220
      net_printf(&thd->net,ER_WRONG_DB_NAME, lex->name);
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      break;
    }
2223 2224
    if (lower_case_table_names)
      casedn_str(lex->name);
2225 2226
    if (check_access(thd,CREATE_ACL,lex->name,0,1))
      break;
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    res=mysql_create_db(thd,lex->name,lex->create_info.options,0);
2228 2229
    break;
  }
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  case SQLCOM_DROP_DB:
2231
  {
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    if (!strip_sp(lex->name) || check_db_name(lex->name))
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    {
2234
      net_printf(&thd->net,ER_WRONG_DB_NAME, lex->name);
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      break;
    }
2237 2238
    if (lower_case_table_names)
      casedn_str(lex->name);
2239
    if (check_access(thd,DROP_ACL,lex->name,0,1))
2240
      break;
2241 2242
    if (thd->locked_tables || thd->active_transaction())
    {
2243
      send_error(&thd->net,ER_LOCK_OR_ACTIVE_TRANSACTION);
2244 2245
      goto error;
    }
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    res=mysql_rm_db(thd,lex->name,lex->drop_if_exists,0);
2247 2248
    break;
  }
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  case SQLCOM_CREATE_FUNCTION:
    if (check_access(thd,INSERT_ACL,"mysql",0,1))
      break;
#ifdef HAVE_DLOPEN
    if (!(res = mysql_create_function(thd,&lex->udf)))
      send_ok(&thd->net);
#else
    res= -1;
#endif
    break;
  case SQLCOM_DROP_FUNCTION:
    if (check_access(thd,DELETE_ACL,"mysql",0,1))
      break;
#ifdef HAVE_DLOPEN
    if (!(res = mysql_drop_function(thd,lex->udf.name)))
      send_ok(&thd->net);
#else
    res= -1;
#endif
    break;
2269 2270 2271 2272 2273 2274 2275 2276 2277
  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;

2278 2279 2280 2281
    /*
      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
    */
2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306

    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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2307 2308 2309
      if (!(res = mysql_table_grant(thd,tables,lex->users_list, lex->columns,
				    lex->grant,
				    lex->sql_command == SQLCOM_REVOKE)))
2310
      {
2311
	mysql_update_log.write(thd, thd->query, thd->query_length);
2312 2313
	if (mysql_bin_log.is_open())
	{
2314
	  Query_log_event qinfo(thd, thd->query, thd->query_length);
2315 2316 2317 2318 2319 2320 2321 2322
	  mysql_bin_log.write(&qinfo);
	}
      }
    }
    else
    {
      if (lex->columns.elements)
      {
2323
	send_error(&thd->net,ER_ILLEGAL_GRANT_FOR_TABLE);
2324 2325 2326 2327 2328 2329 2330
	res=1;
      }
      else
	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
			  lex->sql_command == SQLCOM_REVOKE);
      if (!res)
      {
2331
	mysql_update_log.write(thd, thd->query, thd->query_length);
2332 2333
	if (mysql_bin_log.is_open())
	{
2334
	  Query_log_event qinfo(thd, thd->query, thd->query_length);
2335 2336
	  mysql_bin_log.write(&qinfo);
	}
2337
	if (mqh_used && lex->sql_command == SQLCOM_GRANT)
2338
	{
2339 2340 2341
	  List_iterator <LEX_USER> str_list(lex->users_list);
	  LEX_USER *user;
	  while ((user=str_list++))
2342
	    reset_mqh(thd,user);
2343
	}
2344 2345 2346 2347
      }
    }
    break;
  }
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2348
  case SQLCOM_FLUSH:
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  case SQLCOM_RESET:
2350
    if (check_global_access(thd,RELOAD_ACL) || check_db_used(thd, tables))
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      goto error;
2352
    if (reload_acl_and_cache(thd, lex->type, tables))
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      send_error(&thd->net,0);
    else
      send_ok(&thd->net);
    break;
  case SQLCOM_KILL:
    kill_one_thread(thd,lex->thread_id);
    break;
  case SQLCOM_SHOW_GRANTS:
    res=0;
2362 2363
    if ((thd->priv_user &&
	 !strcmp(thd->priv_user,lex->grant_user->user.str)) ||
2364
	!check_access(thd, SELECT_ACL, "mysql",0,1))
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    {
      res = mysql_show_grants(thd,lex->grant_user);
    }
    break;
2369
  case SQLCOM_HA_OPEN:
2370 2371
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL, tables))
2372 2373 2374 2375 2376 2377 2378 2379 2380
      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:
2381 2382
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL, tables))
2383
      goto error;
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2384
    res = mysql_ha_read(thd, tables, lex->ha_read_mode, lex->backup_dir,
2385 2386
			lex->insert_list, lex->ha_rkey_mode, select_lex->where,
			select_lex->select_limit, select_lex->offset_limit);
2387 2388
    break;

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2389
  case SQLCOM_BEGIN:
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    if (thd->locked_tables)
    {
      thd->lock=thd->locked_tables;
      thd->locked_tables=0;			// Will be automaticly closed
      close_thread_tables(thd);			// Free tables
    }
2396 2397 2398 2399 2400 2401
    if (end_active_trans(thd))
    {
      res= -1;
    }
    else
    {
2402
      thd->options= ((thd->options & (ulong) ~(OPTION_STATUS_NO_TRANS_UPDATE)) |
2403 2404 2405 2406
		     OPTION_BEGIN);
      thd->server_status|= SERVER_STATUS_IN_TRANS;
      send_ok(&thd->net);
    }
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    break;
  case SQLCOM_COMMIT:
2409 2410 2411 2412 2413
    /*
      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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2414
  {
2415
    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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2418
    {
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      send_ok(&thd->net);
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    }
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    else
      res= -1;
    break;
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  }
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  case SQLCOM_ROLLBACK:
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    if (!ha_rollback(thd))
2428 2429 2430 2431 2432 2433
    {
      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;
2436
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
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    break;
  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;
}


/****************************************************************************
2452 2453 2454 2455 2456 2457 2458
  Get the user (global) and database privileges for all used tables
  Returns true (error) if we can't get the privileges and we don't use
  table/column grants.
  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.
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2459 2460 2461
****************************************************************************/

bool
2462
check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
2463
	     bool dont_check_global_grants, bool no_errors)
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{
2465 2466 2467 2468
  DBUG_ENTER("check_access");
  DBUG_PRINT("enter",("want_access: %lu  master_access: %lu", want_access,
		      thd->master_access));
  ulong db_access,dummy;
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  if (save_priv)
    *save_priv=0;
  else
    save_priv= &dummy;

2474
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
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  {
2476 2477
    if (!no_errors)
      send_error(&thd->net,ER_NO_DB_ERROR);	/* purecov: tested */
2478
    DBUG_RETURN(TRUE);				/* purecov: tested */
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  }

  if ((thd->master_access & want_access) == want_access)
  {
    *save_priv=thd->master_access;
2484
    DBUG_RETURN(FALSE);
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2485
  }
2486
  if (((want_access & ~thd->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
2487
      ! db && dont_check_global_grants)
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2488
  {						// We can never grant this
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    if (!no_errors)
      net_printf(&thd->net,ER_ACCESS_DENIED_ERROR,
		 thd->priv_user,
		 thd->host_or_ip,
		 thd->password ? ER(ER_YES) : ER(ER_NO));/* purecov: tested */
2494
    DBUG_RETURN(TRUE);				/* purecov: tested */
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  }

  if (db == any_db)
2498
    DBUG_RETURN(FALSE);				// Allow select on anything
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  if (db && (!thd->db || strcmp(db,thd->db)))
    db_access=acl_get(thd->host, thd->ip, (char*) &thd->remote.sin_addr,
		      thd->priv_user, db); /* purecov: inspected */
  else
    db_access=thd->db_access;
2505 2506
  // Remove SHOW attribute and access rights we already have
  want_access &= ~(thd->master_access | EXTRA_ACL);
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  db_access= ((*save_priv=(db_access | thd->master_access)) & want_access);
2508 2509

  /* grant_option is set if there exists a single table or column grant */
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2510
  if (db_access == want_access ||
2511 2512
      ((grant_option && !dont_check_global_grants) &&
       !(want_access & ~TABLE_ACLS)))
2513
    DBUG_RETURN(FALSE);				/* Ok */
2514 2515 2516 2517 2518
  if (!no_errors)
    net_printf(&thd->net,ER_DBACCESS_DENIED_ERROR,
	       thd->priv_user,
	       thd->host_or_ip,
	       db ? db : thd->db ? thd->db : "unknown"); /* purecov: tested */
2519
  DBUG_RETURN(TRUE);				/* purecov: tested */
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}


2523 2524 2525
/* check for global access and give descriptive error message if it fails */

bool check_global_access(THD *thd, ulong want_access)
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2526
{
2527 2528 2529 2530 2531 2532 2533
  char command[128];
  if ((thd->master_access & want_access) == want_access)
    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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2537
/*
2538 2539
  Check the privilege for all used tables.  Table privileges are cached
  in the table list for GRANT checking
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*/

2542
bool
2543
check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
2544
		   bool no_errors)
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2545
{
2546 2547
  uint found=0;
  ulong found_access=0;
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  TABLE_LIST *org_tables=tables;
  for (; tables ; tables=tables->next)
  {
2551 2552
    if ((thd->master_access & want_access) == (want_access & ~EXTRA_ACL) &&
	thd->db)
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      tables->grant.privilege= want_access;
2554
    else if (tables->db && tables->db == thd->db)
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    {
      if (found && !grant_option)		// db already checked
	tables->grant.privilege=found_access;
      else
      {
2560 2561
	if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
			 0, no_errors))
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2562 2563
	  return TRUE;				// Access denied
	found_access=tables->grant.privilege;
2564
	found=1;
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      }
    }
2567
    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
2568
			  0, no_errors))
2569
      return TRUE;
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2570 2571
  }
  if (grant_option)
2572
    return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
2573
		       test(want_access & EXTRA_ACL), no_errors);
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  return FALSE;
}


2578
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;
}


2595 2596
static bool check_merge_table_access(THD *thd, char *db,
				     TABLE_LIST *table_list)
2597 2598 2599 2600
{
  int error=0;
  if (table_list)
  {
2601
    /* Check that all tables use the current database */
2602 2603
    TABLE_LIST *tmp;
    for (tmp=table_list; tmp ; tmp=tmp->next)
2604 2605 2606
    {
      if (!tmp->db || !tmp->db[0])
	tmp->db=db;
2607
      else if (strcmp(tmp->db,db))
2608 2609 2610 2611 2612
      {
	send_error(&thd->net,ER_UNION_TABLES_IN_DIFFERENT_DIR);
	return 1;
      }
    }
2613 2614 2615 2616 2617 2618 2619
    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

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;
}

#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;
}


/****************************************************************************
2677
	Initialize global thd variables needed for query
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****************************************************************************/

static void
mysql_init_query(THD *thd)
{
  DBUG_ENTER("mysql_init_query");
2684
  thd->lex.select_lex.item_list.empty();
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  thd->lex.value_list.empty();
2686
  thd->lex.select_lex.table_list.elements=0;
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2687
  thd->free_list=0;  thd->lex.union_option=0;
2688 2689 2690
  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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2691
  thd->lex.select_lex.next=0;
2692
  thd->lex.olap=0;
2693
  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;
2696
  thd->sent_row_count=thd->examined_row_count=0;
2697
  thd->safe_to_cache_query=1;
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  DBUG_VOID_RETURN;
}

2701 2702 2703
void
mysql_init_select(LEX *lex)
{
2704 2705
  SELECT_LEX *select_lex = lex->select;
  select_lex->where=select_lex->having=0;
2706
  select_lex->select_limit= lex->thd->variables.select_limit;
2707
  select_lex->offset_limit=0;
2708 2709
  select_lex->options=0;
  select_lex->linkage=UNSPECIFIED_TYPE;
2710
  select_lex->olap=   UNSPECIFIED_OLAP_TYPE;
2711
  lex->exchange = 0;
2712
  lex->proc_list.first=0;
2713 2714 2715 2716 2717 2718
  select_lex->order_list.elements=select_lex->group_list.elements=0;
  select_lex->order_list.first=0;
  select_lex->order_list.next= (byte**) &select_lex->order_list.first;
  select_lex->group_list.first=0;
  select_lex->group_list.next= (byte**) &select_lex->group_list.first;
  select_lex->next = (SELECT_LEX *)NULL; 
2719 2720
}

2721

2722
bool
2723 2724
mysql_new_select(LEX *lex)
{
2725
  SELECT_LEX *select_lex = (SELECT_LEX *) lex->thd->calloc(sizeof(SELECT_LEX));
2726 2727
  if (!select_lex)
    return 1;
2728
  lex->select->next=select_lex; 
2729
  lex->select=select_lex;
2730
  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;
2738
}
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2739

2740

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void mysql_init_multi_delete(LEX *lex)
{
  lex->sql_command =  SQLCOM_DELETE_MULTI;
  mysql_init_select(lex);
2745
  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);
}
2751

2752

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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;
2760
  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)
    {
2765 2766
      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
2777 2778 2779
    {
      DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
			 thd->fatal_error));
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      query_cache_abort(&thd->net);
2781
    }
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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;
}


inline static void
link_in_list(SQL_LIST *list,byte *element,byte **next)
{
  list->elements++;
  (*list->next)=element;
  list->next=next;
  *next=0;
}


/*****************************************************************************
** 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();
  }

  if (default_value && default_value->type() == Item::NULL_ITEM)
  {
    if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) ==
	NOT_NULL_FLAG)
    {
      net_printf(&thd->net,ER_INVALID_DEFAULT,field_name);
      DBUG_RETURN(1);
    }
    default_value=0;
  }
  if (!(new_field=new create_field()))
    DBUG_RETURN(1);
  new_field->field=0;
  new_field->field_name=field_name;
  new_field->def= (type_modifier & AUTO_INCREMENT_FLAG ? 0 : default_value);
  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;
  if (length)
    if (!(new_field->length= (uint) atoi(length)))
      length=0; /* purecov: inspected */
  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)
      new_field->length = 10;			// Default length for DECIMAL
    new_field->length+=sign_len;
    if (new_field->decimals)
      new_field->length++;
    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
add_proc_to_list(Item *item)
{
  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;
  link_in_list(&current_lex->proc_list,(byte*) order,(byte**) &order->next);
  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;
  link_in_list(&list,(byte*) order,(byte**) &order->next);
  DBUG_RETURN(0);
}


TABLE_LIST *add_table_to_list(Table_ident *table, LEX_STRING *alias,
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			      bool updating,
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			      thr_lock_type flags,
			      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;
  if (table->table.length > NAME_LEN ||
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      check_table_name(table->table.str,table->table.length) ||
      table->db.str && check_db_name(table->db.str))
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  {
    net_printf(&thd->net,ER_WRONG_TABLE_NAME,table->table.str);
    DBUG_RETURN(0);
  }

  if (!alias)					/* Alias is case sensitive */
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    if (!(alias_str=thd->memdup(alias_str,table->table.length+1)))
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      DBUG_RETURN(0);
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  if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
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    DBUG_RETURN(0);				/* purecov: inspected */
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  if (table->db.str) 
  {
    ptr->db= table->db.str;
    ptr->db_length= table->db.length;
  }
  else if (thd->db)
  {
    ptr->db= thd->db;
    ptr->db_length= thd->db_length;
  }
  else
  {
    ptr->db= (char*) "";
    ptr->db_length= 0;
  }
    
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  ptr->name=alias_str;
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  if (lower_case_table_names)
  {
    casedn_str(ptr->db);
    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=flags;
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  ptr->updating=updating;
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  if (use_index)
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    ptr->use_index=(List<String> *) thd->memdup((gptr) use_index,
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					       sizeof(*use_index));
  if (ignore_index)
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    ptr->ignore_index=(List<String> *) thd->memdup((gptr) ignore_index,
						   sizeof(*ignore_index));
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  /* check that used name is unique */
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  if (flags != TL_IGNORE)
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  {
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    for (TABLE_LIST *tables=(TABLE_LIST*) thd->lex.select->table_list.first ;
	 tables ;
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	 tables=tables->next)
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    {
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      if (!strcmp(alias_str,tables->name) && !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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    }
  }
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  link_in_list(&thd->lex.select->table_list,(byte*) ptr,(byte**) &ptr->next);
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  DBUG_RETURN(ptr);
}

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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)
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{
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  /* Handle the case when we are not using union */
  if (!lex->select_lex.next)
  {
    *result= (TABLE_LIST*) lex->select_lex.table_list.first;
    return 0;
  }

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  SELECT_LEX *sl;
  TABLE_LIST **new_table_list= result, *aux;
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  *new_table_list=0;				// end result list
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  for (sl= &lex->select_lex; sl; sl=sl->next)
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  {
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    if (sl->order_list.first && sl->next && !sl->braces)
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    {
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      net_printf(&thd->net,ER_WRONG_USAGE,"UNION","ORDER BY");
      return 1;
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    }
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    if ((aux= (TABLE_LIST*) sl->table_list.first))
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    {
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      TABLE_LIST *next;
      for (; aux; aux=next)
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      {
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	TABLE_LIST *cursor;
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	aux->do_redirect=true;
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	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) &&
	      !strcmp(cursor->name, aux->name))
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	    break;
	if (!cursor)
	{
	  /* Add not used table to the total table list */
	  aux->lock_type= lex->lock_option;
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	  if (!(cursor = (TABLE_LIST *) thd->memdup((char*) aux,
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						    sizeof(*aux))))
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	  {
	    send_error(&thd->net,0);
	    return 1;
	  }
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	  *new_table_list= cursor;
	  new_table_list= &cursor->next;
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	  *new_table_list=0;			// end result list
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	}
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	else
	  aux->shared=1;			// Mark that it's used twice
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	aux->table=(TABLE *) cursor;
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      }
    }
  }
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  return 0;
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}

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void add_join_on(TABLE_LIST *b,Item *expr)
{
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  if (!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);
  }
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}


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

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

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

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bool reload_acl_and_cache(THD *thd, ulong options, TABLE_LIST *tables)
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{
  bool result=0;

  select_errors=0;				/* Write if more errors */
  if (options & REFRESH_GRANT)
  {
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    acl_reload(thd);
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    grant_reload();
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    if (mqh_used)
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      reset_mqh(thd,(LEX_USER *) NULL,true);
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  }
  if (options & REFRESH_LOG)
  {
    mysql_log.new_file();
    mysql_update_log.new_file();
    mysql_bin_log.new_file();
    mysql_slow_log.new_file();
    if (ha_flush_logs())
      result=1;
  }
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#ifdef HAVE_QUERY_CACHE
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  if (options & REFRESH_QUERY_CACHE_FREE)
  {
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    query_cache.pack();				// FLUSH QUERY CACHE
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    options &= ~REFRESH_QUERY_CACHE; //don't flush all cache, just free memory
  }
  if (options & (REFRESH_TABLES | REFRESH_QUERY_CACHE))
  {
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    query_cache.flush();			// RESET QUERY CACHE
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  }
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#endif /*HAVE_QUERY_CACHE*/
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  if (options & (REFRESH_TABLES | REFRESH_READ_LOCK))
  {
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    if ((options & REFRESH_READ_LOCK) && thd)
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    {
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      if (lock_global_read_lock(thd))
	return 1;
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    }
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    result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1, tables);
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  }
  if (options & REFRESH_HOSTS)
    hostname_cache_refresh();
  if (options & REFRESH_STATUS)
    refresh_status();
  if (options & REFRESH_THREADS)
    flush_thread_cache();
  if (options & REFRESH_MASTER)
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    if (reset_master(thd))
      result=1;
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#ifdef OPENSSL
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   if (options & REFRESH_DES_KEY_FILE)
   {
     if (des_key_file)
       result=load_des_key_file(des_key_file);
   }
#endif
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 if (options & REFRESH_SLAVE)
 {
   LOCK_ACTIVE_MI;
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   if (reset_slave(thd, active_mi))
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     result=1;
   UNLOCK_ACTIVE_MI;
 }
 if (options & REFRESH_USER_RESOURCES)
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   reset_mqh(thd,(LEX_USER *) NULL);
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 return result;
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}


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/*
  kill on thread

  SYNOPSIS
    kill_one_thread()
    thd			Thread class
    id			Thread id

  NOTES
    This is written such that we have a short lock on LOCK_thread_count
*/

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

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

/* Clear most status variables */

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

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

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

  SYNOPSIS
    check_simple_select()

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

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