sql_parse.cc 199 KB
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/* Copyright (C) 2000-2003 MySQL AB
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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

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

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

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

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#ifdef SOLARIS
extern "C" int gethostname(char *name, int namelen);
#endif
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static void time_out_user_resource_limits(THD *thd, USER_CONN *uc);
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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static int check_for_max_user_connections(THD *thd, USER_CONN *uc);
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#endif
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static void decrease_user_connections(USER_CONN *uc);
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static bool check_db_used(THD *thd,TABLE_LIST *tables);
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static bool check_multi_update_lock(THD *thd);
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static void remove_escape(char *name);
static void refresh_status(void);
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static bool append_file_to_dir(THD *thd, const char **filename_ptr,
			       const char *table_name);
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static void log_slow_query(THD *thd);
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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",
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  "Connect","Kill","Debug","Ping","Time","Delayed insert","Change user",
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  "Binlog Dump","Table Dump",  "Connect Out", "Register Slave",
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  "Prepare", "Execute", "Long Data", "Close stmt",
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  "Reset stmt", "Set option", "Fetch",
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  "Error"					// Last command number
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};

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const char *xa_state_names[]={
  "NON-EXISTING", "ACTIVE", "IDLE", "PREPARED"
};

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

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

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static bool end_active_trans(THD *thd)
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{
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  int error=0;
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  DBUG_ENTER("end_active_trans");
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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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    DBUG_PRINT("info",("options: 0x%lx", (ulong) thd->options));
    /* Safety if one did "drop table" on locked tables */
    if (!thd->locked_tables)
      thd->options&= ~OPTION_TABLE_LOCK;
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    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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    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
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  }
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  DBUG_RETURN(error);
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}

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static bool begin_trans(THD *thd)
{
  int error=0;
  if (thd->locked_tables)
  {
    thd->lock=thd->locked_tables;
    thd->locked_tables=0;			// Will be automatically closed
    close_thread_tables(thd);			// Free tables
  }
  if (end_active_trans(thd))
    error= -1;
  else
  {
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    LEX *lex= thd->lex;
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    thd->options= ((thd->options & (ulong) ~(OPTION_STATUS_NO_TRANS_UPDATE)) |
		   OPTION_BEGIN);
    thd->server_status|= SERVER_STATUS_IN_TRANS;
    if (lex->start_transaction_opt & MYSQL_START_TRANS_OPT_WITH_CONS_SNAPSHOT)
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      error= ha_start_consistent_snapshot(thd);
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  }
  return error;
}
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#ifdef HAVE_REPLICATION
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inline bool all_tables_not_ok(THD *thd, TABLE_LIST *tables)
{
  return (table_rules_on && tables && !tables_ok(thd,tables) &&
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          ((thd->lex->sql_command != SQLCOM_DELETE_MULTI) ||
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           !tables_ok(thd,
		      (TABLE_LIST *)thd->lex->auxilliary_table_list.first)));
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}
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#endif
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static HASH hash_user_connections;

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

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

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

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int check_user(THD *thd, enum enum_server_command command, 
	       const char *passwd, uint passwd_len, const char *db,
	       bool check_count)
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{
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  DBUG_ENTER("check_user");
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#ifdef NO_EMBEDDED_ACCESS_CHECKS
  thd->master_access= GLOBAL_ACLS;			// Full rights
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  /* Change database if necessary */
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  if (db && db[0])
  {
    thd->db= 0;
    thd->db_length= 0;
    if (mysql_change_db(thd, db))
    {
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      /* Send the error to the client */
      net_send_error(thd);
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      if (thd->user_connect)
	decrease_user_connections(thd->user_connect);
      DBUG_RETURN(-1);
    }
  }
  else
    send_ok(thd);
  DBUG_RETURN(0);
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#else

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

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

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

      /* Don't allow user to connect if he has done too many queries */
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      if ((ur.questions || ur.updates || ur.conn_per_hour || ur.user_conn ||
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	   max_user_connections) &&
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	  get_or_create_user_conn(thd,
            opt_old_style_user_limits ? thd->user : thd->priv_user,
            opt_old_style_user_limits ? thd->host_or_ip : thd->priv_host,
            &ur))
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	DBUG_RETURN(-1);
      if (thd->user_connect &&
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	  (thd->user_connect->user_resources.conn_per_hour ||
	   thd->user_connect->user_resources.user_conn ||
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	   max_user_connections) &&
	  check_for_max_user_connections(thd, thd->user_connect))
	DBUG_RETURN(-1);
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      /* Change database if necessary */
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      if (db && db[0])
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      {
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        if (mysql_change_db(thd, db))
        {
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          /* Send error to the client */
          net_send_error(thd);
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          if (thd->user_connect)
            decrease_user_connections(thd->user_connect);
          DBUG_RETURN(-1);
        }
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      }
      else
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	send_ok(thd);
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      thd->password= test(passwd_len);          // remember for error messages 
      /* Ready to handle queries */
      DBUG_RETURN(0);
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    }
  }
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  else if (res == 2) // client gave short hash, server has long hash
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  {
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    net_printf_error(thd, ER_NOT_SUPPORTED_AUTH_MODE);
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    mysql_log.write(thd,COM_CONNECT,ER(ER_NOT_SUPPORTED_AUTH_MODE));
    DBUG_RETURN(-1);
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  }
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  net_printf_error(thd, ER_ACCESS_DENIED_ERROR,
                   thd->user,
                   thd->host_or_ip,
                   passwd_len ? ER(ER_YES) : ER(ER_NO));
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  mysql_log.write(thd, COM_CONNECT, ER(ER_ACCESS_DENIED_ERROR),
                  thd->user,
                  thd->host_or_ip,
                  passwd_len ? ER(ER_YES) : ER(ER_NO));
  DBUG_RETURN(-1);
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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}

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

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

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

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


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/*
  check if user has already too many connections
  
  SYNOPSIS
  check_for_max_user_connections()
  thd			Thread handle
  uc			User connect object

  NOTES
    If check fails, we decrease user connection count, which means one
    shouldn't call decrease_user_connections() after this function.

  RETURN
    0	ok
    1	error
*/

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#ifndef NO_EMBEDDED_ACCESS_CHECKS

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static int check_for_max_user_connections(THD *thd, USER_CONN *uc)
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{
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  int error=0;
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  DBUG_ENTER("check_for_max_user_connections");
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  (void) pthread_mutex_lock(&LOCK_user_conn);
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  if (max_user_connections && !uc->user_resources.user_conn &&
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      max_user_connections < (uint) uc->connections)
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  {
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    net_printf_error(thd, ER_TOO_MANY_USER_CONNECTIONS, uc->user);
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    error=1;
    goto end;
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  }
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  time_out_user_resource_limits(thd, uc);
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  if (uc->user_resources.user_conn &&
      uc->user_resources.user_conn < uc->connections)
  {
    net_printf_error(thd, ER_USER_LIMIT_REACHED, uc->user,
                     "max_user_connections",
                     (long) uc->user_resources.user_conn);
    error= 1;
    goto end;
  }
  if (uc->user_resources.conn_per_hour &&
      uc->user_resources.conn_per_hour <= uc->conn_per_hour)
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  {
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    net_printf_error(thd, ER_USER_LIMIT_REACHED, uc->user,
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                     "max_connections_per_hour",
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                     (long) uc->user_resources.conn_per_hour);
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    error=1;
    goto end;
  }
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  uc->conn_per_hour++;
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  end:
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  if (error)
    uc->connections--; // no need for decrease_user_connections() here
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  (void) pthread_mutex_unlock(&LOCK_user_conn);
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  DBUG_RETURN(error);
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}
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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/*
  Decrease user connection count

  SYNOPSIS
    decrease_user_connections()
    uc			User connection object

  NOTES
    If there is a n user connection object for a connection
    (which only happens if 'max_user_connections' is defined or
    if someone has created a resource grant for a user), then
    the connection count is always incremented on connect.

    The user connect object is not freed if some users has
    'max connections per hour' defined as we need to be able to hold
    count over the lifetime of the connection.
*/

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

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

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/*
  Mark all commands that somehow changes a table
  This is used to check number of updates / hour
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  sql_command is actually set to SQLCOM_END sometimes
  so we need the +1 to include it in the array.
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  numbers are:
     0  - read-only query
  != 0  - query that may change a table
     2  - query that returns meaningful ROW_COUNT() -
          a number of modified rows
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*/

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char  uc_update_queries[SQLCOM_END+1];
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void init_update_queries(void)
{
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  bzero((gptr) &uc_update_queries, sizeof(uc_update_queries));

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  uc_update_queries[SQLCOM_CREATE_TABLE]=1;
  uc_update_queries[SQLCOM_CREATE_INDEX]=1;
  uc_update_queries[SQLCOM_ALTER_TABLE]=1;
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  uc_update_queries[SQLCOM_UPDATE]=2;
  uc_update_queries[SQLCOM_UPDATE_MULTI]=2;
  uc_update_queries[SQLCOM_INSERT]=2;
  uc_update_queries[SQLCOM_INSERT_SELECT]=2;
  uc_update_queries[SQLCOM_DELETE]=2;
  uc_update_queries[SQLCOM_DELETE_MULTI]=2;
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  uc_update_queries[SQLCOM_TRUNCATE]=1;
  uc_update_queries[SQLCOM_DROP_TABLE]=1;
  uc_update_queries[SQLCOM_LOAD]=1;
  uc_update_queries[SQLCOM_CREATE_DB]=1;
  uc_update_queries[SQLCOM_DROP_DB]=1;
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  uc_update_queries[SQLCOM_REPLACE]=2;
  uc_update_queries[SQLCOM_REPLACE_SELECT]=2;
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  uc_update_queries[SQLCOM_RENAME_TABLE]=1;
  uc_update_queries[SQLCOM_BACKUP_TABLE]=1;
  uc_update_queries[SQLCOM_RESTORE_TABLE]=1;
  uc_update_queries[SQLCOM_DROP_INDEX]=1;
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  uc_update_queries[SQLCOM_CREATE_VIEW]=1;
  uc_update_queries[SQLCOM_DROP_VIEW]=1;
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}

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bool is_update_query(enum enum_sql_command command)
{
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  DBUG_ASSERT(command >= 0 && command <= SQLCOM_END);
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  return uc_update_queries[command];
}
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/*
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  Reset per-hour user resource limits when it has been more than
  an hour since they were last checked
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  SYNOPSIS:
    time_out_user_resource_limits()
    thd			Thread handler
    uc			User connection details
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  NOTE:
    This assumes that the LOCK_user_conn mutex has been acquired, so it is
    safe to test and modify members of the USER_CONN structure.
*/
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static void time_out_user_resource_limits(THD *thd, USER_CONN *uc)
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{
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  time_t check_time = thd->start_time ?  thd->start_time : time(NULL);
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  DBUG_ENTER("time_out_user_resource_limits");
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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)
  {
    uc->questions=1;
    uc->updates=0;
    uc->conn_per_hour=0;
    uc->intime=check_time;
  }
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  DBUG_VOID_RETURN;
}


/*
  Check if maximum queries per hour limit has been reached
  returns 0 if OK.
*/

static bool check_mqh(THD *thd, uint check_command)
{
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
  bool error= 0;
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  time_t check_time = thd->start_time ?  thd->start_time : time(NULL);
  USER_CONN *uc=thd->user_connect;
  DBUG_ENTER("check_mqh");
  DBUG_ASSERT(uc != 0);

  (void) pthread_mutex_lock(&LOCK_user_conn);

  time_out_user_resource_limits(thd, uc);

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  /* Check that we have not done too many questions / hour */
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  if (uc->user_resources.questions &&
      uc->questions++ >= uc->user_resources.questions)
  {
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    net_printf_error(thd, ER_USER_LIMIT_REACHED, uc->user, "max_questions",
                     (long) uc->user_resources.questions);
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    error=1;
    goto end;
  }
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  if (check_command < (uint) SQLCOM_END)
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  {
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    /* Check that we have not done too many updates / hour */
    if (uc->user_resources.updates && uc_update_queries[check_command] &&
	uc->updates++ >= uc->user_resources.updates)
    {
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      net_printf_error(thd, ER_USER_LIMIT_REACHED, uc->user, "max_updates",
                       (long) uc->user_resources.updates);
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      error=1;
      goto end;
    }
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  }
end:
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  (void) pthread_mutex_unlock(&LOCK_user_conn);
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  DBUG_RETURN(error);
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#else
  return (0);
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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}

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static void reset_mqh(LEX_USER *lu, bool get_them= 0)
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{
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  (void) pthread_mutex_lock(&LOCK_user_conn);
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  if (lu)  // for GRANT
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  {
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    USER_CONN *uc;
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    uint temp_len=lu->user.length+lu->host.length+2;
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    char temp_user[USERNAME_LENGTH+HOSTNAME_LENGTH+2];

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

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

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

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

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

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

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

  if (thd->client_capabilities & CLIENT_INTERACTIVE)
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    thd->variables.net_wait_timeout= thd->variables.net_interactive_timeout;
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  if ((thd->client_capabilities & CLIENT_TRANSACTIONS) &&
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      opt_using_transactions)
    net->return_status= &thd->server_status;
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  net->read_timeout=(uint) thd->variables.net_read_timeout;
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  char *user= end;
  char *passwd= strend(user)+1;
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  char *db= passwd;
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  char db_buff[NAME_LEN+1];                     // buffer to store db in utf8
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  char user_buff[USERNAME_LENGTH+1];		// buffer to store user in utf8
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  uint dummy_errors;

  /*
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    Old clients send null-terminated string as password; new clients send
    the size (1 byte) + string (not null-terminated). Hence in case of empty
    password both send '\0'.
  */
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  uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ?
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    *passwd++ : strlen(passwd);
  db= thd->client_capabilities & CLIENT_CONNECT_WITH_DB ?
    db + passwd_len + 1 : 0;
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  /* Since 4.1 all database names are stored in utf8 */
  if (db)
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  {
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    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
                             system_charset_info,
                             db, strlen(db),
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                             thd->charset(), &dummy_errors)]= 0;
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    db= db_buff;
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  }
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  user_buff[copy_and_convert(user_buff, sizeof(user_buff)-1,
                             system_charset_info, user, strlen(user),
                             thd->charset(), &dummy_errors)]= '\0';
  user= user_buff;
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  if (thd->user)
    x_free(thd->user);
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  if (!(thd->user= my_strdup(user, MYF(0))))
    return (ER_OUT_OF_RESOURCES);
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  return check_user(thd, COM_CONNECT, passwd, passwd_len, db, TRUE);
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}

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void execute_init_command(THD *thd, sys_var_str *init_command_var,
			  rw_lock_t *var_mutex)
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{
  Vio* save_vio;
  ulong save_client_capabilities;

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  thd->proc_info= "Execution of init_command";
  /*
    We need to lock init_command_var because
    during execution of init_command_var query
    values of init_command_var can't be changed
  */
  rw_rdlock(var_mutex);
  thd->query= init_command_var->value;
  thd->query_length= init_command_var->value_length;
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  save_client_capabilities= thd->client_capabilities;
  thd->client_capabilities|= CLIENT_MULTI_QUERIES;
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  /*
    We don't need return result of execution to client side.
    To forbid this we should set thd->net.vio to 0.
  */
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  save_vio= thd->net.vio;
  thd->net.vio= 0;
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  thd->net.no_send_error= 0;
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  dispatch_command(COM_QUERY, thd, thd->query, thd->query_length+1);
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  rw_unlock(var_mutex);
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  thd->client_capabilities= save_client_capabilities;
  thd->net.vio= save_vio;
}


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

  pthread_detach_this_thread();

1031
#if !defined( __WIN__) && !defined(OS2)	// Win32 calls this in pthread_create
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  /* The following calls needs to be done before we call DBUG_ macros */
1033
  if (!(test_flags & TEST_NO_THREADS) & my_thread_init())
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  {
1035
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
1036
    statistic_increment(aborted_connects,&LOCK_status);
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    end_thread(thd,0);
    return 0;
  }
#endif

1042 1043 1044 1045 1046 1047 1048
  /*
    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));
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  /* now that we've called my_thread_init(), it is safe to call DBUG_* */
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#if defined(__WIN__)
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  init_signals();				// IRENA; testing ?
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#elif !defined(OS2) && !defined(__NETWARE__)
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  sigset_t set;
  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
#endif
  if (thd->store_globals())
  {
1062
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
1063
    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;
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    net->no_send_error= 0;
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    if ((error=check_connection(thd)))
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    {						// Wrong permissions
      if (error > 0)
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	net_printf_error(thd, error, thd->host_or_ip);
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#ifdef __NT__
      if (vio_type(net->vio) == VIO_TYPE_NAMEDPIPE)
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	my_sleep(1000);				/* must wait after eof() */
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#endif
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      statistic_increment(aborted_connects,&LOCK_status);
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      goto end_thread;
    }
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#ifdef __NETWARE__
    netware_reg_user(thd->ip, thd->user, "MySQL");
#endif
1089
    if (thd->variables.max_join_size == HA_POS_ERROR)
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      thd->options |= OPTION_BIG_SELECTS;
    if (thd->client_capabilities & CLIENT_COMPRESS)
      net->compress=1;				// Use compression

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    thd->version= refresh_version;
1095
    thd->proc_info= 0;
1096
    thd->command= COM_SLEEP;
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    thd->set_time();
    thd->init_for_queries();
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    if (sys_init_connect.value_length && !(thd->master_access & SUPER_ACL))
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    {
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      execute_init_command(thd, &sys_init_connect, &LOCK_sys_init_connect);
      if (thd->query_error)
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	thd->killed= THD::KILL_CONNECTION;
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    }

    thd->proc_info=0;
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    thd->set_time();
1109
    thd->init_for_queries();
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    while (!net->error && net->vio != 0 &&
           !(thd->killed == THD::KILL_CONNECTION))
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    {
1113
      net->no_send_error= 0;
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      if (do_command(thd))
	break;
    }
1117 1118
    if (thd->user_connect)
      decrease_user_connections(thd->user_connect);
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    if (net->error && net->vio != 0 && net->report_error)
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    {
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      if (!thd->killed && thd->variables.log_warnings > 1)
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	sql_print_warning(ER(ER_NEW_ABORTING_CONNECTION),
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                          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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      net_send_error(thd, net->last_errno, NullS);
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      statistic_increment(aborted_threads,&LOCK_status);
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    }
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    else if (thd->killed)
    {
      statistic_increment(aborted_threads,&LOCK_status);
    }
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end_thread:
1137
    close_connection(thd, 0, 1);
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    end_thread(thd,1);
    /*
      If end_thread returns, we are either running with --one-thread
      or this thread has been schedule to handle the next query
    */
    thd= current_thd;
  } while (!(test_flags & TEST_NO_THREADS));
  /* The following is only executed if we are not using --one-thread */
  return(0);					/* purecov: deadcode */
}

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#endif /* EMBEDDED_LIBRARY */

1151 1152 1153 1154
/*
  Execute commands from bootstrap_file.
  Used when creating the initial grant tables
*/
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1156
extern "C" pthread_handler_decl(handle_bootstrap,arg)
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{
1158 1159 1160
  THD *thd=(THD*) arg;
  FILE *file=bootstrap_file;
  char *buff;
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  /* The following must be called before DBUG_ENTER */
1163
  if (my_thread_init() || thd->store_globals())
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  {
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#ifndef EMBEDDED_LIBRARY
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    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
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#endif
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    thd->fatal_error();
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    goto end;
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  }
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  DBUG_ENTER("handle_bootstrap");

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

  thd->proc_info=0;
  thd->version=refresh_version;
1188
  thd->priv_user=thd->user=(char*) my_strdup("boot", MYF(MY_WME));
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  buff= (char*) thd->net.buff;
1191
  thd->init_for_queries();
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  while (fgets(buff, thd->net.max_packet, file))
  {
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   ulong length= (ulong) strlen(buff);
   while (buff[length-1] != '\n' && !feof(file))
   {
     /*
       We got only a part of the current string. Will try to increase
       net buffer then read the rest of the current string.
     */
     if (net_realloc(&(thd->net), 2 * thd->net.max_packet))
     {
       net_send_error(thd, ER_NET_PACKET_TOO_LARGE, NullS);
       thd->fatal_error();
       break;
     }
     buff= (char*) thd->net.buff;
     fgets(buff + length, thd->net.max_packet - length, file);
     length+= (ulong) strlen(buff + length);
   }
   if (thd->is_fatal_error)
     break;

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    while (length && (my_isspace(thd->charset(), buff[length-1]) ||
1215
           buff[length-1] == ';'))
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      length--;
    buff[length]=0;
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    thd->query_length=length;
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    thd->query= thd->memdup_w_gap(buff, length+1, thd->db_length+1);
    thd->query[length] = '\0';
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    /*
      We don't need to obtain LOCK_thread_count here because in bootstrap
      mode we have only one thread.
    */
1225
    thd->query_id=next_query_id();
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    mysql_parse(thd,thd->query,length);
    close_thread_tables(thd);			// Free tables
1228
    if (thd->is_fatal_error)
1229
      break;
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    free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
1231
#ifdef USING_TRANSACTIONS
1232
    free_root(&thd->transaction.mem_root,MYF(MY_KEEP_PREALLOC));
1233
#endif
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  }
1235 1236 1237

  /* thd->fatal_error should be set in case something went wrong */
end:
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  bootstrap_error= thd->is_fatal_error;

  net_end(&thd->net);
  thd->cleanup();
  delete thd;

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#ifndef EMBEDDED_LIBRARY
1245 1246 1247
  (void) pthread_mutex_lock(&LOCK_thread_count);
  thread_count--;
  (void) pthread_mutex_unlock(&LOCK_thread_count);
1248
  (void) pthread_cond_broadcast(&COND_thread_count);
1249 1250
  my_thread_end();
  pthread_exit(0);
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#endif
1252
  DBUG_RETURN(0);
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}

1255
    /* This works because items are allocated with sql_alloc() */
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1257
void free_items(Item *item)
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{
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  Item *next;
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  DBUG_ENTER("free_items");
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  for (; item ; item=next)
  {
    next=item->next;
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    item->delete_self();
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  }
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  DBUG_VOID_RETURN;
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}

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    /* This works because items are allocated with sql_alloc() */

void cleanup_items(Item *item)
{
  for (; item ; item=item->next)
    item->cleanup();
}

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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;
1284
  if (!(table_list = (TABLE_LIST*) thd->calloc(sizeof(TABLE_LIST))))
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    DBUG_RETURN(1); // out of memory
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VIEW  
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  table_list->db= db;
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  table_list->table_name= table_list->alias= tbl_name;
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  table_list->lock_type= TL_READ_NO_INSERT;
  table_list->prev_global= &table_list;	// can be removed after merge with 4.1
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  if (!db || check_db_name(db))
  {
1293
    my_error(ER_WRONG_DB_NAME ,MYF(0), db ? db : "NULL");
1294 1295
    goto err;
  }
1296
  if (lower_case_table_names)
1297
    my_casedn_str(files_charset_info, tbl_name);
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  remove_escape(table_list->table_name);
1299 1300 1301 1302

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

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  if (check_one_table_access(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_list, -1)))
1309
  {
1310
    my_error(ER_GET_ERRNO, MYF(0), my_errno);
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    goto err;
  }
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  net_flush(&thd->net);
1314
  if ((error= table->file->dump(thd,fd)))
1315
    my_error(ER_GET_ERRNO, MYF(0), error);
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err:
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  DBUG_RETURN(error);
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}

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/*
  Ends the current transaction and (maybe) begin the next

  SYNOPSIS
1325
    end_trans()
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      thd            Current thread
      completion     Completion type

  RETURN
    0 - OK
*/

1333
int end_trans(THD *thd, enum enum_mysql_completiontype completion)
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{
  bool do_release= 0;
  int res= 0;
1337
  DBUG_ENTER("end_trans");
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  switch (completion) {
  case COMMIT:
    /*
     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...)
    */
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
1347
    res= ha_commit(thd);
1348
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
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    break;
  case COMMIT_RELEASE:
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    do_release= 1; /* fall through */
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  case COMMIT_AND_CHAIN:
    res= end_active_trans(thd);
    if (!res && completion == COMMIT_AND_CHAIN)
      res= begin_trans(thd);
    break;
  case ROLLBACK_RELEASE:
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    do_release= 1; /* fall through */
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  case ROLLBACK:
  case ROLLBACK_AND_CHAIN:
  {
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
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    if (ha_rollback(thd))
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      res= -1;
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
    if (!res && (completion == ROLLBACK_AND_CHAIN))
      res= begin_trans(thd);
    break;
  }
  default:
    res= -1;
    my_error(ER_UNKNOWN_COM_ERROR, MYF(0));
    DBUG_RETURN(-1);
  }
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  if (res < 0)
    my_error(thd->killed_errno(), MYF(0));
  else if ((res == 0) && do_release)
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    thd->killed= THD::KILL_CONNECTION;

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  DBUG_RETURN(res);
}
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1384
#ifndef EMBEDDED_LIBRARY
1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395

/*
  Read one command from socket and execute it (query or simple command).
  This function is called in loop from thread function.
  SYNOPSIS
    do_command()
  RETURN VALUE
    0  success
    1  request of thread shutdown (see dispatch_command() description)
*/

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

  net= &thd->net;
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  /*
    indicator of uninitialized lex => normal flow of errors handling
    (see my_message_sql)
  */
1410
  thd->lex->current_select= 0;
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  packet=0;
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  old_timeout=net->read_timeout;
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  /* Wait max for 8 hours */
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  net->read_timeout=(uint) thd->variables.net_wait_timeout;
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  thd->clear_error();				// Clear error message
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  net_new_transaction(net);
  if ((packet_length=my_net_read(net)) == packet_error)
  {
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    DBUG_PRINT("info",("Got error %d reading command from socket %s",
		       net->error,
		       vio_description(net->vio)));
    /* Check if we can continue without closing the connection */
    if (net->error != 3)
1426 1427
    {
      statistic_increment(aborted_threads,&LOCK_status);
1428
      DBUG_RETURN(TRUE);			// We have to close it.
1429
    }
1430
    net_send_error(thd, net->last_errno, NullS);
1431
    net->error= 0;
1432
    DBUG_RETURN(FALSE);
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  }
  else
  {
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    if (thd->killed == THD::KILL_QUERY || thd->killed == THD::KILL_BAD_DATA)
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      thd->killed= THD::NOT_KILLED;
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    packet=(char*) net->read_pos;
    command = (enum enum_server_command) (uchar) packet[0];
1441 1442
    if (command >= COM_END)
      command= COM_END;				// Wrong command
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    DBUG_PRINT("info",("Command on %s = %d (%s)",
		       vio_description(net->vio), command,
		       command_name[command]));
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  }
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  net->read_timeout=old_timeout;		// restore it
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  /*
    packet_length contains length of data, as it was stored in packet
    header. In case of malformed header, packet_length can be zero.
    If packet_length is not zero, my_net_read ensures that this number
    of bytes was actually read from network. Additionally my_net_read
    sets packet[packet_length]= 0 (thus if packet_length == 0,
    command == packet[0] == COM_SLEEP).
    In dispatch_command packet[packet_length] points beyond the end of packet.
  */
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  DBUG_RETURN(dispatch_command(command,thd, packet+1, (uint) packet_length));
1458
}
1459
#endif  /* EMBEDDED_LIBRARY */
1460

1461

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/*
   Perform one connection-level (COM_XXXX) command.
  SYNOPSIS
    dispatch_command()
    thd             connection handle
    command         type of command to perform 
    packet          data for the command, packet is always null-terminated
    packet_length   length of packet + 1 (to show that data is
                    null-terminated) except for COM_SLEEP, where it
                    can be zero.
  RETURN VALUE
    0   ok
    1   request of thread shutdown, i. e. if command is
        COM_QUIT/COM_SHUTDOWN
*/
1477

1478 1479 1480 1481
bool dispatch_command(enum enum_server_command command, THD *thd,
		      char* packet, uint packet_length)
{
  NET *net= &thd->net;
1482
  bool error= 0;
1483 1484 1485
  DBUG_ENTER("dispatch_command");

  thd->command=command;
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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
  */
1490
  thd->slow_command=FALSE;
1491
  thd->lex->sql_command= SQLCOM_END; /* to avoid confusing VIEW detectors */
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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)
1496
    next_query_id();
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  thread_running++;
1498
  /* TODO: set thd->lex->sql_command to SQLCOM_END here */
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  VOID(pthread_mutex_unlock(&LOCK_thread_count));
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  thd->server_status&=
           ~(SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED);
1503
  switch (command) {
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  case COM_INIT_DB:
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  {
    LEX_STRING tmp;
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    statistic_increment(thd->status_var.com_stat[SQLCOM_CHANGE_DB],
			&LOCK_status);
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    thd->convert_string(&tmp, system_charset_info,
			packet, strlen(packet), thd->charset());
    if (!mysql_change_db(thd, tmp.str))
      mysql_log.write(thd,command,"%s",thd->db);
    break;
  }
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#ifdef HAVE_REPLICATION
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  case COM_REGISTER_SLAVE:
  {
1518
    if (!register_slave(thd, (uchar*)packet, packet_length))
1519
      send_ok(thd);
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    break;
  }
1522
#endif
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  case COM_TABLE_DUMP:
1524 1525 1526 1527 1528
  {
    char *db, *tbl_name;
    uint db_len= *(uchar*) packet;
    uint tbl_len= *(uchar*) (packet + db_len + 1);

1529
    statistic_increment(thd->status_var.com_other, &LOCK_status);
1530
    thd->slow_command= TRUE;
1531 1532 1533
    db= thd->alloc(db_len + tbl_len + 2);
    tbl_name= strmake(db, packet + 1, db_len)+1;
    strmake(tbl_name, packet + db_len + 2, tbl_len);
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    mysql_table_dump(thd, db, tbl_name, -1);
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    break;
  }
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  case COM_CHANGE_USER:
  {
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    thd->change_user();
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    thd->clear_error();                         // if errors from rollback
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    statistic_increment(thd->status_var.com_other, &LOCK_status);
1543
    char *user= (char*) packet;
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    char *passwd= strend(user)+1;
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    /* 
      Old clients send null-terminated string ('\0' for empty string) for
      password.  New clients send the size (1 byte) + string (not null
      terminated, so also '\0' for empty string).
    */
1550
    char db_buff[NAME_LEN+1];                 // buffer to store db in utf8 
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    char *db= passwd;
    uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ? 
      *passwd++ : strlen(passwd);
    db+= passwd_len + 1;
1555
#ifndef EMBEDDED_LIBRARY
1556
    /* Small check for incoming packet */
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    if ((uint) ((uchar*) db - net->read_pos) > packet_length)
1558
    {
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      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
1560 1561
      break;
    }
1562
#endif
1563
    /* Convert database name to utf8 */
1564
    uint dummy_errors;
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    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
                             system_charset_info, db, strlen(db),
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                             thd->charset(), &dummy_errors)]= 0;
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    db= db_buff;
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1570 1571 1572 1573 1574 1575 1576
    /* Save user and privileges */
    uint save_master_access= thd->master_access;
    uint save_db_access= thd->db_access;
    uint save_db_length= thd->db_length;
    char *save_user= thd->user;
    char *save_priv_user= thd->priv_user;
    char *save_db= thd->db;
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    USER_CONN *save_user_connect= thd->user_connect;
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    if (!(thd->user= my_strdup(user, MYF(0))))
1580 1581
    {
      thd->user= save_user;
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      my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
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      break;
    }
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    /* Clear variables that are allocated */
    thd->user_connect= 0;
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    int res= check_user(thd, COM_CHANGE_USER, passwd, passwd_len, db, FALSE);
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    if (res)
    {
1592
      /* authentication failure, we shall restore old user */
1593
      if (res > 0)
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        my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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      x_free(thd->user);
      thd->user= save_user;
      thd->priv_user= save_priv_user;
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      thd->user_connect= save_user_connect;
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      thd->master_access= save_master_access;
      thd->db_access= save_db_access;
      thd->db= save_db;
      thd->db_length= save_db_length;
    }
    else
    {
      /* we've authenticated new user */
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      if (save_user_connect)
	decrease_user_connections(save_user_connect);
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      x_free((gptr) save_db);
      x_free((gptr) save_user);
    }
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    break;
  }
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  case COM_EXECUTE:
  {
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    mysql_stmt_execute(thd, packet, packet_length);
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    break;
  }
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  case COM_FETCH:
  {
    mysql_stmt_fetch(thd, packet, packet_length);
    break;
  }
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  case COM_LONG_DATA:
  {
1626
    mysql_stmt_get_longdata(thd, packet, packet_length);
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    break;
  }
  case COM_PREPARE:
  {
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    mysql_stmt_prepare(thd, packet, packet_length, 0);
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    break;
  }
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  case COM_CLOSE_STMT:
  {
    mysql_stmt_free(thd, packet);
    break;
  }
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  case COM_RESET_STMT:
  {
    mysql_stmt_reset(thd, packet);
    break;
  }
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  case COM_QUERY:
  {
1646 1647
    if (alloc_query(thd, packet, packet_length))
      break;					// fatal error is set
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    char *packet_end= thd->query + thd->query_length;
1649
    mysql_log.write(thd,command,"%s",thd->query);
1650
    DBUG_PRINT("query",("%-.4096s",thd->query));
1651
    mysql_parse(thd,thd->query, thd->query_length);
1652

1653
    while (!thd->killed && thd->lex->found_semicolon && !thd->net.report_error)
1654
    {
1655
      char *packet= thd->lex->found_semicolon;
1656
      /*
1657
        Multiple queries exits, execute them individually
1658
	in embedded server - just store them to be executed later 
1659
      */
1660
#ifndef EMBEDDED_LIBRARY
1661 1662
      if (thd->lock || thd->open_tables || thd->derived_tables ||
          thd->prelocked_mode)
1663
        close_thread_tables(thd);
1664
#endif
1665
      ulong length= (ulong)(packet_end-packet);
1666

1667 1668
      log_slow_query(thd);

1669
      /* Remove garbage at start of query */
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      while (my_isspace(thd->charset(), *packet) && length > 0)
1671 1672 1673 1674
      {
        packet++;
        length--;
      }
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      VOID(pthread_mutex_lock(&LOCK_thread_count));
1676
      thd->query_length= length;
1677
      thd->query= packet;
1678
      thd->query_id= next_query_id();
1679
      thd->set_time(); /* Reset the query start time. */
1680
      /* TODO: set thd->lex->sql_command to SQLCOM_END here */
1681
      VOID(pthread_mutex_unlock(&LOCK_thread_count));
1682
#ifndef EMBEDDED_LIBRARY
1683
      mysql_parse(thd, packet, length);
1684
#else
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      /*
	'packet' can point inside the query_rest's buffer
	so we have to do memmove here
       */
      if (thd->query_rest.length() > length)
      {
	memmove(thd->query_rest.c_ptr(), packet, length);
	thd->query_rest.length(length);
      }
      else
1695
	thd->query_rest.copy(packet, length, thd->query_rest.charset());
1696 1697 1698

      thd->server_status&= ~ (SERVER_QUERY_NO_INDEX_USED |
                              SERVER_QUERY_NO_GOOD_INDEX_USED);
1699 1700
      break;
#endif /*EMBEDDED_LIBRARY*/
1701 1702
    }

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    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),WAIT_PRIOR);
    DBUG_PRINT("info",("query ready"));
    break;
  }
1708
  case COM_FIELD_LIST:				// This isn't actually needed
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#ifdef DONT_ALLOW_SHOW_COMMANDS
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    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0));	/* purecov: inspected */
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    break;
#else
  {
1715
    char *fields, *pend;
1716 1717
    /* Locked closure of all tables */
    TABLE_LIST *locked_tables= NULL;
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    TABLE_LIST table_list;
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    LEX_STRING conv_name;
1720
    /* Saved variable value */
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    my_bool old_innodb_table_locks= 
              IF_INNOBASE_DB(thd->variables.innodb_table_locks, FALSE);
1723

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1725 1726
    statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_FIELDS],
			&LOCK_status);
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    bzero((char*) &table_list,sizeof(table_list));
    if (!(table_list.db=thd->db))
    {
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      my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
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      break;
    }
1733
    pend= strend(packet);
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    thd->convert_string(&conv_name, system_charset_info,
			packet, (uint) (pend-packet), thd->charset());
1736
    table_list.alias= table_list.table_name= conv_name.str;
1737
    packet= pend+1;
1738 1739 1740 1741 1742 1743 1744 1745 1746

    if (!my_strcasecmp(system_charset_info, table_list.db,
                       information_schema_name.str))
    {
      ST_SCHEMA_TABLE *schema_table= find_schema_table(thd, table_list.alias);
      if (schema_table)
        table_list.schema_table= schema_table;
    }

1747
    thd->query_length= strlen(packet);       // for simplicity: don't optimize
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    if (!(thd->query=fields=thd->memdup(packet,thd->query_length+1)))
      break;
1750
    mysql_log.write(thd,command,"%s %s",table_list.table_name, fields);
1751
    if (lower_case_table_names)
1752 1753
      my_casedn_str(files_charset_info, table_list.table_name);
    remove_escape(table_list.table_name);	// This can't have wildcards
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    if (check_access(thd,SELECT_ACL,table_list.db,&table_list.grant.privilege,
		     0, 0))
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      break;
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    if (grant_option &&
	check_grant(thd, SELECT_ACL, &table_list, 2, UINT_MAX, 0))
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      break;
1761 1762 1763 1764 1765 1766
    /* init structures for VIEW processing */
    table_list.select_lex= &(thd->lex->select_lex);
    mysql_init_query(thd, (uchar*)"", 0);
    thd->lex->
      select_lex.table_list.link_in_list((byte*) &table_list,
                                         (byte**) &table_list.next_local);
1767
    thd->lex->query_tables= &table_list;
1768

1769 1770
    /* switch on VIEW optimisation: do not fill temporary tables */
    thd->lex->sql_command= SQLCOM_SHOW_FIELDS;
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    mysqld_list_fields(thd,&table_list,fields);
1772
    thd->lex->unit.cleanup();
1773
    thd->cleanup_after_query();
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1774 1775 1776 1777
    break;
  }
#endif
  case COM_QUIT:
1778
    /* We don't calculate statistics for this command */
1779
    mysql_log.write(thd,command,NullS);
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    net->error=0;				// Don't give 'abort' message
    error=TRUE;					// End server
    break;

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  case COM_CREATE_DB:				// QQ: To be removed
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    {
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      char *db=thd->strdup(packet), *alias;
1787
      HA_CREATE_INFO create_info;
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1789 1790
      statistic_increment(thd->status_var.com_stat[SQLCOM_CREATE_DB],
			  &LOCK_status);
1791
      // null test to handle EOM
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      if (!db || !(alias= thd->strdup(db)) || check_db_name(db))
1793
      {
1794
	my_error(ER_WRONG_DB_NAME, MYF(0), db ? db : "NULL");
1795 1796
	break;
      }
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      if (check_access(thd,CREATE_ACL,db,0,1,0))
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	break;
1799
      mysql_log.write(thd,command,packet);
1800
      bzero(&create_info, sizeof(create_info));
1801 1802
      mysql_create_db(thd, (lower_case_table_names == 2 ? alias : db),
                      &create_info, 0);
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      break;
    }
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  case COM_DROP_DB:				// QQ: To be removed
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    {
1807 1808
      statistic_increment(thd->status_var.com_stat[SQLCOM_DROP_DB],
			  &LOCK_status);
1809
      char *db=thd->strdup(packet);
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1810
      /*  null test to handle EOM */
1811
      if (!db || check_db_name(db))
1812
      {
1813
	my_error(ER_WRONG_DB_NAME, MYF(0), db ? db : "NULL");
1814 1815
	break;
      }
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      if (check_access(thd,DROP_ACL,db,0,1,0))
1817
	break;
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      if (thd->locked_tables || thd->active_transaction())
      {
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	my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                   ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
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	break;
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      }
1824
      mysql_log.write(thd,command,db);
1825
      mysql_rm_db(thd, db, 0, 0);
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      break;
    }
1828
#ifndef EMBEDDED_LIBRARY
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  case COM_BINLOG_DUMP:
    {
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      ulong pos;
      ushort flags;
      uint32 slave_server_id;

1835
      statistic_increment(thd->status_var.com_other,&LOCK_status);
1836
      thd->slow_command = TRUE;
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1837
      if (check_global_access(thd, REPL_SLAVE_ACL))
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	break;
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1839

1840
      /* TODO: The following has to be changed to an 8 byte integer */
1841 1842
      pos = uint4korr(packet);
      flags = uint2korr(packet + 4);
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      thd->server_id=0; /* avoid suicide */
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1844
      if ((slave_server_id= uint4korr(packet+6))) // mysqlbinlog.server_id==0
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	kill_zombie_dump_threads(slave_server_id);
1846
      thd->server_id = slave_server_id;
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      mysql_log.write(thd, command, "Log: '%s'  Pos: %ld", packet+10,
                      (long) pos);
1850
      mysql_binlog_send(thd, thd->strdup(packet + 10), (my_off_t) pos, flags);
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      unregister_slave(thd,1,1);
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1852
      /*  fake COM_QUIT -- if we get here, the thread needs to terminate */
1853 1854
      error = TRUE;
      net->error = 0;
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1855 1856
      break;
    }
1857
#endif
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1858 1859
  case COM_REFRESH:
    {
1860 1861
      statistic_increment(thd->status_var.com_stat[SQLCOM_FLUSH],
			  &LOCK_status);
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1862
      ulong options= (ulong) (uchar) packet[0];
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1863
      if (check_global_access(thd,RELOAD_ACL))
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	break;
1865
      mysql_log.write(thd,command,NullS);
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1866
      if (!reload_acl_and_cache(thd, options, (TABLE_LIST*) 0, NULL))
1867
        send_ok(thd);
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      break;
    }
1870
#ifndef EMBEDDED_LIBRARY
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1871
  case COM_SHUTDOWN:
1872
  {
1873
    statistic_increment(thd->status_var.com_other, &LOCK_status);
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1874
    if (check_global_access(thd,SHUTDOWN_ACL))
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      break; /* purecov: inspected */
1876
    /*
1877 1878 1879 1880
      If the client is < 4.1.3, it is going to send us no argument; then
      packet_length is 1, packet[0] is the end 0 of the packet. Note that
      SHUTDOWN_DEFAULT is 0. If client is >= 4.1.3, the shutdown level is in
      packet[0].
1881
    */
1882 1883
    enum mysql_enum_shutdown_level level=
      (enum mysql_enum_shutdown_level) (uchar) packet[0];
1884
    DBUG_PRINT("quit",("Got shutdown command for level %u", level));
1885 1886 1887 1888 1889 1890 1891
    if (level == SHUTDOWN_DEFAULT)
      level= SHUTDOWN_WAIT_ALL_BUFFERS; // soon default will be configurable
    else if (level != SHUTDOWN_WAIT_ALL_BUFFERS)
    {
      my_error(ER_NOT_SUPPORTED_YET, MYF(0), "this shutdown level");
      break;
    }
1892
    DBUG_PRINT("quit",("Got shutdown command for level %u", level));
1893
    mysql_log.write(thd,command,NullS);
1894
    send_eof(thd);
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1895 1896 1897
#ifdef __WIN__
    sleep(1);					// must wait after eof()
#endif
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1898
#ifndef OS2
1899
    send_eof(thd);				// This is for 'quit request'
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#endif
1901
    close_connection(thd, 0, 1);
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    close_thread_tables(thd);			// Free before kill
    kill_mysql();
    error=TRUE;
    break;
1906
  }
1907
#endif
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  case COM_STATISTICS:
  {
1910
    mysql_log.write(thd,command,NullS);
1911 1912
    statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_STATUS],
			&LOCK_status);
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#ifndef EMBEDDED_LIBRARY
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    char buff[200];
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#else
    char *buff= thd->net.last_error;
#endif
1918
    ulong uptime = (ulong) (thd->start_time - start_time);
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    sprintf((char*) buff,
1920
	    "Uptime: %lu  Threads: %d  Questions: %lu  Slow queries: %lu  Opens: %lu  Flush tables: %lu  Open tables: %u  Queries per second avg: %.3f",
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	    uptime,
1922 1923 1924
	    (int) thread_count, (ulong) thd->query_id,
            (ulong) thd->status_var.long_query_count,
	    thd->status_var.opened_tables, refresh_version, cached_tables(),
1925 1926
	    (uptime ? (ulonglong2double(thd->query_id) / (double) uptime) :
	     (double) 0));
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#ifdef SAFEMALLOC
1928
    if (sf_malloc_cur_memory)				// Using SAFEMALLOC
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      sprintf(strend(buff), "  Memory in use: %ldK  Max memory used: %ldK",
1930 1931
	      (sf_malloc_cur_memory+1023L)/1024L,
	      (sf_malloc_max_memory+1023L)/1024L);
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#endif
#ifndef EMBEDDED_LIBRARY
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    VOID(my_net_write(net, buff,(uint) strlen(buff)));
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    VOID(net_flush(net));
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#endif
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    break;
  }
  case COM_PING:
1940
    statistic_increment(thd->status_var.com_other, &LOCK_status);
1941
    send_ok(thd);				// Tell client we are alive
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    break;
  case COM_PROCESS_INFO:
1944 1945
    statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_PROCESSLIST],
			&LOCK_status);
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    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
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      break;
1948
    mysql_log.write(thd,command,NullS);
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    mysqld_list_processes(thd,
			  thd->master_access & PROCESS_ACL ? 
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			  NullS : thd->priv_user, 0);
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    break;
  case COM_PROCESS_KILL:
  {
1955
    statistic_increment(thd->status_var.com_stat[SQLCOM_KILL], &LOCK_status);
1956
    ulong id=(ulong) uint4korr(packet);
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    kill_one_thread(thd,id,false);
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    break;
  }
1960 1961
  case COM_SET_OPTION:
  {
1962 1963
    statistic_increment(thd->status_var.com_stat[SQLCOM_SET_OPTION],
			&LOCK_status);
1964 1965 1966 1967
    enum_mysql_set_option command= (enum_mysql_set_option) uint2korr(packet);
    switch (command) {
    case MYSQL_OPTION_MULTI_STATEMENTS_ON:
      thd->client_capabilities|= CLIENT_MULTI_STATEMENTS;
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      send_eof(thd);
1969 1970 1971
      break;
    case MYSQL_OPTION_MULTI_STATEMENTS_OFF:
      thd->client_capabilities&= ~CLIENT_MULTI_STATEMENTS;
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      send_eof(thd);
1973 1974
      break;
    default:
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      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
1976 1977 1978 1979
      break;
    }
    break;
  }
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  case COM_DEBUG:
1981
    statistic_increment(thd->status_var.com_other, &LOCK_status);
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    if (check_global_access(thd, SUPER_ACL))
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1983
      break;					/* purecov: inspected */
1984
    mysql_print_status();
1985
    mysql_log.write(thd,command,NullS);
1986
    send_eof(thd);
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1987 1988 1989 1990 1991
    break;
  case COM_SLEEP:
  case COM_CONNECT:				// Impossible here
  case COM_TIME:				// Impossible from client
  case COM_DELAYED_INSERT:
1992
  case COM_END:
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  default:
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    my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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    break;
  }
1997 1998
  if (thd->lock || thd->open_tables || thd->derived_tables ||
      thd->prelocked_mode)
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1999 2000 2001 2002
  {
    thd->proc_info="closing tables";
    close_thread_tables(thd);			/* Free tables */
  }
2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013
  /*
    assume handlers auto-commit (if some doesn't - transaction handling
    in MySQL should be redesigned to support it; it's a big change,
    and it's not worth it - better to commit explicitly only writing
    transactions, read-only ones should better take care of themselves.
    saves some work in 2pc too)
    see also sql_base.cc - close_thread_tables()
  */
  bzero(&thd->transaction.stmt, sizeof(thd->transaction.stmt));
  if (!thd->active_transaction())
    thd->transaction.xid.null();
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2014

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  /* report error issued during command execution */
  if (thd->killed_errno() && !thd->net.report_error)
    thd->send_kill_message();
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2018
  if (thd->net.report_error)
2019
    net_send_error(thd);
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2020

2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038
  log_slow_query(thd);

  thd->proc_info="cleaning up";
  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For process list
  thd->proc_info=0;
  thd->command=COM_SLEEP;
  thd->query=0;
  thd->query_length=0;
  thread_running--;
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
  thd->packet.shrink(thd->variables.net_buffer_length);	// Reclaim some memory
  free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
  DBUG_RETURN(error);
}


static void log_slow_query(THD *thd)
{
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  time_t start_of_query=thd->start_time;
2040
  thd->end_time();				// Set start time
2041

2042
  /* If not reading from backup and if the query took too long */
2043
  if (!thd->slow_command && !thd->user_time) // do not log 'slow_command' queries
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  {
2045 2046
    thd->proc_info="logging slow query";

2047 2048
    if ((ulong) (thd->start_time - thd->time_after_lock) >
	thd->variables.long_query_time ||
2049 2050
	((thd->server_status &
	  (SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED)) &&
2051
	 (specialflag & SPECIAL_LOG_QUERIES_NOT_USING_INDEXES)))
2052
    {
2053
      thd->status_var.long_query_count++;
2054 2055
      mysql_slow_log.write(thd, thd->query, thd->query_length, start_of_query);
    }
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  }
}

2059

2060 2061 2062 2063 2064
int prepare_schema_table(THD *thd, LEX *lex, Table_ident *table_ident,
                         enum enum_schema_tables schema_table_idx)
{
  DBUG_ENTER("prepare_schema_table");
  SELECT_LEX *sel= 0;
2065
  switch (schema_table_idx) {
2066 2067
  case SCH_SCHEMATA:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
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    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0));   /* purecov: inspected */
2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080
    DBUG_RETURN(1);
#else
    if ((specialflag & SPECIAL_SKIP_SHOW_DB) &&
	check_global_access(thd, SHOW_DB_ACL))
      DBUG_RETURN(1);
    break;
#endif
  case SCH_TABLE_NAMES:
  case SCH_TABLES:
  case SCH_VIEWS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
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2081 2082
    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */
2083 2084 2085 2086 2087 2088
    DBUG_RETURN(1);
#else
    {
      char *db= lex->select_lex.db ? lex->select_lex.db : thd->db;
      if (!db)
      {
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2089 2090
	my_message(ER_NO_DB_ERROR,
                   ER(ER_NO_DB_ERROR), MYF(0)); /* purecov: inspected */
2091 2092 2093 2094 2095
        DBUG_RETURN(1);				/* purecov: inspected */
      }
      remove_escape(db);				// Fix escaped '_'
      if (check_db_name(db))
      {
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2096
        my_error(ER_WRONG_DB_NAME, MYF(0), db);
2097 2098 2099 2100 2101 2102
        DBUG_RETURN(1);
      }
      if (check_access(thd,SELECT_ACL,db,&thd->col_access,0,0))
        DBUG_RETURN(1);			        /* purecov: inspected */
      if (!thd->col_access && check_grant_db(thd,db))
      {
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	my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
                 thd->priv_user, thd->priv_host, db);
2105 2106
	DBUG_RETURN(1);
      }
2107 2108 2109 2110 2111
      /*
        We need to do a copy to make this prepared statement safe if this
        was thd->db
      */
      lex->select_lex.db= thd->strdup(db);
2112 2113 2114 2115 2116 2117
      break;
    }
#endif
  case SCH_COLUMNS:
  case SCH_STATISTICS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
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2118 2119
    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */
2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133
    DBUG_RETURN(1);
#else
    if (table_ident)
    {
      TABLE_LIST **query_tables_last= lex->query_tables_last;
      sel= new SELECT_LEX();
      sel->init_query();
      if(!sel->add_table_to_list(thd, table_ident, 0, 0, TL_READ, 
                                 (List<String> *) 0, (List<String> *) 0))
        DBUG_RETURN(1);
      lex->query_tables_last= query_tables_last;
      TABLE_LIST *table_list= (TABLE_LIST*) sel->table_list.first;
      char *db= table_list->db;
      remove_escape(db);			// Fix escaped '_'
2134
      remove_escape(table_list->table_name);
2135 2136 2137 2138 2139 2140 2141 2142 2143
      if (check_access(thd,SELECT_ACL | EXTRA_ACL,db,
                       &table_list->grant.privilege, 0, 0))
        DBUG_RETURN(1);				/* purecov: inspected */
      if (grant_option && check_grant(thd, SELECT_ACL, table_list, 2,
                                      UINT_MAX, 0))
        DBUG_RETURN(1);
      break;
    }
#endif
2144 2145 2146
  case SCH_OPEN_TABLES:
  case SCH_VARIABLES:
  case SCH_STATUS:
2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167
  case SCH_PROCEDURES:
  case SCH_CHARSETS:
  case SCH_COLLATIONS:
  case SCH_COLLATION_CHARACTER_SET_APPLICABILITY:
  case SCH_USER_PRIVILEGES:
  case SCH_SCHEMA_PRIVILEGES:
  case SCH_TABLE_PRIVILEGES:
  case SCH_COLUMN_PRIVILEGES:
  case SCH_TABLE_CONSTRAINTS:
  case SCH_KEY_COLUMN_USAGE:
  default:
    break;
  }
  
  SELECT_LEX *select_lex= lex->current_select;
  if (make_schema_select(thd, select_lex, schema_table_idx))
  {
    DBUG_RETURN(1);
  }
  TABLE_LIST *table_list= (TABLE_LIST*) select_lex->table_list.first;
  table_list->schema_select_lex= sel;
2168
  table_list->schema_table_reformed= 1;
2169 2170 2171 2172
  DBUG_RETURN(0);
}


2173 2174 2175 2176 2177 2178 2179 2180 2181 2182
/*
  Read query from packet and store in thd->query
  Used in COM_QUERY and COM_PREPARE

  DESCRIPTION
    Sets the following THD variables:
      query
      query_length

  RETURN VALUES
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2183 2184
    FALSE ok
    TRUE  error;  In this case thd->fatal_error is set
2185 2186 2187 2188 2189
*/

bool alloc_query(THD *thd, char *packet, ulong packet_length)
{
  packet_length--;				// Remove end null
2190
  /* Remove garbage at start and end of query */
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2191
  while (my_isspace(thd->charset(),packet[0]) && packet_length > 0)
2192 2193 2194 2195 2196
  {
    packet++;
    packet_length--;
  }
  char *pos=packet+packet_length;		// Point at end null
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2197
  while (packet_length > 0 &&
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2198
	 (pos[-1] == ';' || my_isspace(thd->charset() ,pos[-1])))
2199 2200 2201 2202 2203
  {
    pos--;
    packet_length--;
  }
  /* We must allocate some extra memory for query cache */
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2204
  thd->query_length= 0;                        // Extra safety: Avoid races
2205 2206
  if (!(thd->query= (char*) thd->memdup_w_gap((gptr) (packet),
					      packet_length,
2207 2208
					      thd->db_length+ 1 +
					      QUERY_CACHE_FLAGS_SIZE)))
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    return TRUE;
2210 2211
  thd->query[packet_length]=0;
  thd->query_length= packet_length;
2212 2213 2214 2215

  /* Reclaim some memory */
  thd->packet.shrink(thd->variables.net_buffer_length);
  thd->convert_buffer.shrink(thd->variables.net_buffer_length);
2216 2217 2218

  if (!(specialflag & SPECIAL_NO_PRIOR))
    my_pthread_setprio(pthread_self(),QUERY_PRIOR);
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2219
  return FALSE;
2220 2221
}

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2222 2223 2224 2225 2226
/****************************************************************************
** mysql_execute_command
** Execute command saved in thd and current_lex->sql_command
****************************************************************************/

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bool
2228
mysql_execute_command(THD *thd)
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2229
{
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  bool	res= FALSE;
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  int result= 0;
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  LEX	*lex= thd->lex;
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  /* first SELECT_LEX (have special meaning for many of non-SELECTcommands) */
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  SELECT_LEX *select_lex= &lex->select_lex;
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2235 2236
  bool slave_fake_lock= 0;
  MYSQL_LOCK *fake_prev_lock= 0;
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VIEW  
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2237
  /* first table of first SELECT_LEX */
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  TABLE_LIST *first_table= (TABLE_LIST*) select_lex->table_list.first;
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VIEW  
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2239 2240 2241
  /* list of all tables in query */
  TABLE_LIST *all_tables;
  /* most outer SELECT_LEX_UNIT of query */
2242
  SELECT_LEX_UNIT *unit= &lex->unit;
2243
  /* Saved variable value */
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2244
  DBUG_ENTER("mysql_execute_command");
2245
  thd->net.no_send_error= 0;
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2246

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VIEW  
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2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262
  /*
    In many cases first table of main SELECT_LEX have special meaning =>
    check that it is first table in global list and relink it first in 
    queries_tables list if it is necessary (we need such relinking only
    for queries with subqueries in select list, in this case tables of
    subqueries will go to global list first)

    all_tables will differ from first_table only if most upper SELECT_LEX
    do not contain tables.

    Because of above in place where should be at least one table in most
    outer SELECT_LEX we have following check:
    DBUG_ASSERT(first_table == all_tables);
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
  */
  lex->first_lists_tables_same();
2263
  /* should be assigned after making first tables same */
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VIEW  
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2264 2265
  all_tables= lex->query_tables;

2266 2267 2268 2269 2270
  /*
    Reset warning count for each query that uses tables
    A better approach would be to reset this for any commands
    that is not a SHOW command or a select that only access local
    variables, but for now this is probably good enough.
2271
    Don't reset warnings when executing a stored routine.
2272
  */
2273 2274 2275
  if ((all_tables || &lex->select_lex != lex->all_selects_list ||
       lex->spfuns.records || lex->spprocs.records) &&
      !thd->spcont)
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2276
    mysql_reset_errors(thd, 0);
2277

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SCRUM  
unknown committed
2278
#ifdef HAVE_REPLICATION
2279 2280
  if (thd->slave_thread)
  {
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2281
    if (lex->sql_command == SQLCOM_UPDATE_MULTI)
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2282 2283 2284
    {
      DBUG_PRINT("info",("need faked locked tables"));
      
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2285
      if (check_multi_update_lock(thd))
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2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296
        goto error;

      /* Fix for replication, the tables are opened and locked,
         now we pretend that we have performed a LOCK TABLES action */
	 
      fake_prev_lock= thd->locked_tables;
      if (thd->lock)
        thd->locked_tables= thd->lock;
      thd->lock= 0;
      slave_fake_lock= 1;
    }
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2297
    /*
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merge  
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2298
      Skip if we are in the slave thread, some table rules have been
2299 2300 2301 2302
      given and the table list says the query should not be replicated.
      Exception is DROP TEMPORARY TABLE IF EXISTS: we always execute it
      (otherwise we have stale files on slave caused by exclusion of one tmp
      table).
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merge  
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2303
    */
2304 2305
    if (!(lex->sql_command == SQLCOM_DROP_TABLE &&
          lex->drop_temporary && lex->drop_if_exists) &&
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Merge  
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2306
        all_tables_not_ok(thd, all_tables))
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2307 2308
    {
      /* we warn the slave SQL thread */
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2309
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
2310
      DBUG_RETURN(0);
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2311
    }
unknown's avatar
merge  
unknown committed
2312 2313
#ifndef TO_BE_DELETED
    /*
2314 2315 2316
      This is a workaround to deal with the shortcoming in 3.23.44-3.23.46
      masters in RELEASE_LOCK() logging. We re-write SELECT RELEASE_LOCK()
      as DO RELEASE_LOCK()
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merge  
unknown committed
2317
    */
2318 2319 2320
    if (lex->sql_command == SQLCOM_SELECT)
    {
      lex->sql_command = SQLCOM_DO;
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2321
      lex->insert_list = &select_lex->item_list;
2322
    }
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merge  
unknown committed
2323
#endif
2324
  }
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2325
#endif /* !HAVE_REPLICATION */
2326

2327 2328 2329 2330 2331
  /*
    When option readonly is set deny operations which change tables.
    Except for the replication thread and the 'super' users.
  */
  if (opt_readonly &&
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2332
      !(thd->slave_thread || (thd->master_access & SUPER_ACL)) &&
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2333
      uc_update_queries[lex->sql_command])
2334
  {
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2335
    my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
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2336
    DBUG_RETURN(-1);
2337
  }
2338

2339 2340
  statistic_increment(thd->status_var.com_stat[lex->sql_command],
		      &LOCK_status);
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2341 2342 2343
  switch (lex->sql_command) {
  case SQLCOM_SELECT:
  {
2344 2345 2346 2347 2348 2349 2350
    /* assign global limit variable if limit is not given */
    {
      SELECT_LEX *param= lex->unit.global_parameters;
      if (!param->explicit_limit)
	param->select_limit= thd->variables.select_limit;
    }

2351
    select_result *result=lex->result;
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VIEW  
unknown committed
2352
    if (all_tables)
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2353
    {
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VIEW  
unknown committed
2354 2355 2356 2357
      res= check_table_access(thd,
			      lex->exchange ? SELECT_ACL | FILE_ACL :
			      SELECT_ACL,
			      all_tables, 0);
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2358 2359
    }
    else
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VIEW  
unknown committed
2360 2361 2362
      res= check_access(thd,
			lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL,
			any_db, 0, 0, 0);
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2363
    if (res)
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2364
      goto error;
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2365

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VIEW  
unknown committed
2366
    if (!(res= open_and_lock_tables(thd, all_tables)))
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2367
    {
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2368
      if (lex->describe)
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2369
      {
2370
	if (!(result= new select_send()))
2371
	  goto error;
2372 2373
	else
	  thd->send_explain_fields(result);
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unknown committed
2374
	res= mysql_explain_union(thd, &thd->lex->unit, result);
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2375 2376 2377 2378 2379
	if (lex->describe & DESCRIBE_EXTENDED)
	{
	  char buff[1024];
	  String str(buff,(uint32) sizeof(buff), system_charset_info);
	  str.length(0);
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2380
	  thd->lex->unit.print(&str);
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2381 2382 2383 2384
	  str.append('\0');
	  push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
		       ER_YES, str.ptr());
	}
2385
	result->send_eof();
2386
        delete result;
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2387 2388 2389
      }
      else
      {
2390
	if (!result && !(result= new select_send()))
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2391
          goto error;
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VIEW  
unknown committed
2392
	query_cache_store_query(thd, all_tables);
2393
	res= handle_select(thd, lex, result, 0);
2394 2395
        if (result != lex->result)
          delete result;
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2396
      }
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2397
    }
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2398 2399
    break;
  }
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2400
  case SQLCOM_PREPARE:
2401
  {
2402 2403 2404 2405
    char *query_str;
    uint query_len;
    if (lex->prepared_stmt_code_is_varref)
    {
2406
      /* This is PREPARE stmt FROM @var. */
2407 2408 2409 2410
      String str;
      CHARSET_INFO *to_cs= thd->variables.collation_connection;
      bool need_conversion;
      user_var_entry *entry;
2411
      String *pstr= &str;
2412
      uint32 unused;
2413
      /*
2414 2415 2416
        Convert @var contents to string in connection character set. Although
        it is known that int/real/NULL value cannot be a valid query we still
        convert it for error messages to uniform.
2417
      */
2418 2419
      if ((entry=
             (user_var_entry*)hash_search(&thd->user_vars,
2420 2421 2422 2423
                                          (byte*)lex->prepared_stmt_code.str,
                                          lex->prepared_stmt_code.length))
          && entry->value)
      {
2424 2425
        my_bool is_var_null;
        pstr= entry->val_str(&is_var_null, &str, NOT_FIXED_DEC);
2426 2427 2428 2429
        /*
          NULL value of variable checked early as entry->value so here
          we can't get NULL in normal conditions
        */
2430 2431
        DBUG_ASSERT(!is_var_null);
        if (!pstr)
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2432
          goto error;
2433 2434
      }
      else
2435 2436 2437 2438 2439
      {
        /*
          variable absent or equal to NULL, so we need to set variable to
          something reasonable to get readable error message during parsing
        */
2440
        str.set("NULL", 4, &my_charset_latin1);
2441 2442
      }

2443
      need_conversion=
2444 2445
        String::needs_conversion(pstr->length(), pstr->charset(),
                                 to_cs, &unused);
2446

2447 2448
      query_len= need_conversion? (pstr->length() * to_cs->mbmaxlen) :
                                  pstr->length();
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unknown committed
2449
      if (!(query_str= alloc_root(thd->mem_root, query_len+1)))
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2450
        goto error;
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merge  
unknown committed
2451
 
2452
      if (need_conversion)
2453 2454 2455 2456 2457 2458
      {
        uint dummy_errors;
        query_len= copy_and_convert(query_str, query_len, to_cs,
                                    pstr->ptr(), pstr->length(),
                                    pstr->charset(), &dummy_errors);
      }
2459
      else
2460
        memcpy(query_str, pstr->ptr(), pstr->length());
2461
      query_str[query_len]= 0;
2462 2463 2464
    }
    else
    {
2465 2466
      query_str= lex->prepared_stmt_code.str;
      query_len= lex->prepared_stmt_code.length;
2467
      DBUG_PRINT("info", ("PREPARE: %.*s FROM '%.*s' \n",
2468 2469
                          lex->prepared_stmt_name.length,
                          lex->prepared_stmt_name.str,
2470
                          query_len, query_str));
2471
    }
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2472
    thd->command= COM_PREPARE;
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2473 2474
    if (!(res= mysql_stmt_prepare(thd, query_str, query_len + 1,
                                  &lex->prepared_stmt_name)))
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      send_ok(thd, 0L, 0L, "Statement prepared");
    break;
  }
  case SQLCOM_EXECUTE:
  {
2480
    DBUG_PRINT("info", ("EXECUTE: %.*s\n",
2481 2482 2483
                        lex->prepared_stmt_name.length,
                        lex->prepared_stmt_name.str));
    mysql_sql_stmt_execute(thd, &lex->prepared_stmt_name);
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    lex->prepared_stmt_params.empty();
    break;
  }
  case SQLCOM_DEALLOCATE_PREPARE:
  {
2489 2490 2491 2492 2493
    Statement* stmt;
    DBUG_PRINT("info", ("DEALLOCATE PREPARE: %.*s\n", 
                        lex->prepared_stmt_name.length,
                        lex->prepared_stmt_name.str));
    if ((stmt= thd->stmt_map.find_by_name(&lex->prepared_stmt_name)))
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2494
    {
2495 2496
      thd->stmt_map.erase(stmt);
      send_ok(thd);
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2497
    }
2498
    else
2499 2500
    {
      my_error(ER_UNKNOWN_STMT_HANDLER, MYF(0),
2501 2502
               lex->prepared_stmt_name.length,
               lex->prepared_stmt_name.str,
2503
               "DEALLOCATE PREPARE");
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2504
      goto error;
2505
    }
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2506 2507
    break;
  }
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2508
  case SQLCOM_DO:
2509 2510
    if (check_table_access(thd, SELECT_ACL, all_tables, 0) ||
        open_and_lock_tables(thd, all_tables))
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2511
      goto error;
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2512 2513

    res= mysql_do(thd, *lex->insert_list);
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2514 2515
    break;

2516
  case SQLCOM_EMPTY_QUERY:
2517
    send_ok(thd);
2518 2519
    break;

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2520 2521 2522 2523
  case SQLCOM_HELP:
    res= mysqld_help(thd,lex->help_arg);
    break;

2524
#ifndef EMBEDDED_LIBRARY
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2525
  case SQLCOM_PURGE:
2526
  {
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2527
    if (check_global_access(thd, SUPER_ACL))
2528
      goto error;
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2529
    /* PURGE MASTER LOGS TO 'file' */
2530 2531 2532
    res = purge_master_logs(thd, lex->to_log);
    break;
  }
2533 2534
  case SQLCOM_PURGE_BEFORE:
  {
2535 2536
    Item *it;

2537 2538
    if (check_global_access(thd, SUPER_ACL))
      goto error;
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2539
    /* PURGE MASTER LOGS BEFORE 'data' */
2540
    it= (Item *)lex->value_list.head();
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2541 2542
    if ((!it->fixed &&it->fix_fields(lex->thd, 0, &it)) ||
        it->check_cols(1))
2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553
    {
      my_error(ER_WRONG_ARGUMENTS, MYF(0), "PURGE LOGS BEFORE");
      goto error;
    }
    it= new Item_func_unix_timestamp(it);
    /*
      it is OK only emulate fix_fieds, because we need only
      value of constant
    */
    it->quick_fix_field();
    res = purge_master_logs_before_date(thd, (ulong)it->val_int());
2554 2555
    break;
  }
2556
#endif
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2557 2558
  case SQLCOM_SHOW_WARNS:
  {
2559 2560
    res= mysqld_show_warnings(thd, (ulong)
			      ((1L << (uint) MYSQL_ERROR::WARN_LEVEL_NOTE) |
2561 2562 2563
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_WARN) |
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR)
			       ));
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2564 2565 2566 2567
    break;
  }
  case SQLCOM_SHOW_ERRORS:
  {
2568 2569
    res= mysqld_show_warnings(thd, (ulong)
			      (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR));
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2570 2571
    break;
  }
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2572 2573
  case SQLCOM_SHOW_NEW_MASTER:
  {
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2574
    if (check_global_access(thd, REPL_SLAVE_ACL))
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2575
      goto error;
2576
    /* This query don't work now. See comment in repl_failsafe.cc */
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2577
#ifndef WORKING_NEW_MASTER
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2578 2579
    my_error(ER_NOT_SUPPORTED_YET, MYF(0), "SHOW NEW MASTER");
    goto error;
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2580
#else
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2581 2582
    res = show_new_master(thd);
    break;
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2583
#endif
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2584
  }
2585

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2586
#ifdef HAVE_REPLICATION
2587 2588
  case SQLCOM_SHOW_SLAVE_HOSTS:
  {
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2589
    if (check_global_access(thd, REPL_SLAVE_ACL))
2590 2591 2592 2593
      goto error;
    res = show_slave_hosts(thd);
    break;
  }
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2594 2595
  case SQLCOM_SHOW_BINLOG_EVENTS:
  {
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2596
    if (check_global_access(thd, REPL_SLAVE_ACL))
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2597
      goto error;
2598
    res = mysql_show_binlog_events(thd);
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2599 2600
    break;
  }
2601 2602
#endif

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2603
  case SQLCOM_BACKUP_TABLE:
2604
  {
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VIEW  
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2605 2606 2607
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL, all_tables, 0) ||
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2608
	check_global_access(thd, FILE_ACL))
2609
      goto error; /* purecov: inspected */
2610
    thd->slow_command=TRUE;
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VIEW  
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2611
    res = mysql_backup_table(thd, first_table);
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2612

2613 2614
    break;
  }
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2615
  case SQLCOM_RESTORE_TABLE:
2616
  {
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VIEW  
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2617 2618 2619
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, INSERT_ACL, all_tables, 0) ||
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2620
	check_global_access(thd, FILE_ACL))
2621
      goto error; /* purecov: inspected */
2622
    thd->slow_command=TRUE;
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VIEW  
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2623
    res = mysql_restore_table(thd, first_table);
2624 2625
    break;
  }
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2626 2627
  case SQLCOM_ASSIGN_TO_KEYCACHE:
  {
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VIEW  
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2628 2629 2630 2631
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
        check_access(thd, INDEX_ACL, first_table->db,
                     &first_table->grant.privilege, 0, 0))
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2632
      goto error;
2633
    res= mysql_assign_to_keycache(thd, first_table, &lex->ident);
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2634 2635
    break;
  }
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2636 2637
  case SQLCOM_PRELOAD_KEYS:
  {
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VIEW  
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2638 2639 2640 2641
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_access(thd, INDEX_ACL, first_table->db,
                     &first_table->grant.privilege, 0, 0))
2642
      goto error;
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VIEW  
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2643
    res = mysql_preload_keys(thd, first_table);
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2644 2645
    break;
  }
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2646
#ifdef HAVE_REPLICATION
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2647
  case SQLCOM_CHANGE_MASTER:
2648
  {
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2649
    if (check_global_access(thd, SUPER_ACL))
2650
      goto error;
2651
    pthread_mutex_lock(&LOCK_active_mi);
2652
    res = change_master(thd,active_mi);
2653
    pthread_mutex_unlock(&LOCK_active_mi);
2654 2655
    break;
  }
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2656
  case SQLCOM_SHOW_SLAVE_STAT:
2657
  {
2658 2659
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2660
      goto error;
2661
    pthread_mutex_lock(&LOCK_active_mi);
2662
    res = show_master_info(thd,active_mi);
2663
    pthread_mutex_unlock(&LOCK_active_mi);
2664 2665
    break;
  }
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2666
  case SQLCOM_SHOW_MASTER_STAT:
2667
  {
2668 2669
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2670 2671 2672 2673
      goto error;
    res = show_binlog_info(thd);
    break;
  }
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2674

2675
  case SQLCOM_LOAD_MASTER_DATA: // sync with master
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2676
    if (check_global_access(thd, SUPER_ACL))
2677
      goto error;
2678
    if (end_active_trans(thd))
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2679
      goto error;
2680 2681
    else
      res = load_master_data(thd);
2682
    break;
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2683
#endif /* HAVE_REPLICATION */
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2684 2685 2686
#ifdef HAVE_INNOBASE_DB
  case SQLCOM_SHOW_INNODB_STATUS:
    {
2687
      if (check_global_access(thd, SUPER_ACL))
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2688 2689 2690 2691
	goto error;
      res = innodb_show_status(thd);
      break;
    }
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2692 2693 2694
  case SQLCOM_SHOW_MUTEX_STATUS:
    {
      if (check_global_access(thd, SUPER_ACL))
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2695
        goto error;
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2696 2697 2698
      res = innodb_mutex_show_status(thd);
      break;
    }
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2699
#endif
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2700
#ifdef HAVE_REPLICATION
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2701
  case SQLCOM_LOAD_MASTER_TABLE:
2702
  {
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VIEW  
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2703 2704 2705 2706 2707
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (!first_table->db)
      first_table->db= thd->db;
    if (check_access(thd, CREATE_ACL, first_table->db,
		     &first_table->grant.privilege, 0, 0))
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2708 2709 2710 2711
      goto error;				/* purecov: inspected */
    if (grant_option)
    {
      /* Check that the first table has CREATE privilege */
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VIEW  
unknown committed
2712
      if (check_grant(thd, CREATE_ACL, all_tables, 0, 1, 0))
2713
	goto error;
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2714
    }
2715
    if (strlen(first_table->table_name) > NAME_LEN)
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2716
    {
2717
      my_error(ER_WRONG_TABLE_NAME, MYF(0), first_table->table_name);
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2718 2719
      break;
    }
2720
    pthread_mutex_lock(&LOCK_active_mi);
2721 2722 2723 2724
    /*
      fetch_master_table will send the error to the client on failure.
      Give error if the table already exists.
    */
2725
    if (!fetch_master_table(thd, first_table->db, first_table->table_name,
2726
			    active_mi, 0, 0))
2727
    {
2728
      send_ok(thd);
2729
    }
2730
    pthread_mutex_unlock(&LOCK_active_mi);
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2731
    break;
2732
  }
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2733
#endif /* HAVE_REPLICATION */
2734

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2735
  case SQLCOM_CREATE_TABLE:
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2736
  {
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VIEW  
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2737 2738 2739 2740 2741
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    bool link_to_local;
    // Skip first table, which is the table we are creating
    TABLE_LIST *create_table= lex->unlink_first_table(&link_to_local);
    TABLE_LIST *select_tables= lex->query_tables;
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2742

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VIEW  
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2743
    if ((res= create_table_precheck(thd, select_tables, create_table)))
2744
      goto unsent_create_error;
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2745

2746 2747 2748
#ifndef HAVE_READLINK
    lex->create_info.data_file_name=lex->create_info.index_file_name=0;
#else
2749
    /* Fix names if symlinked tables */
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2750
    if (append_file_to_dir(thd, &lex->create_info.data_file_name,
2751
			   create_table->table_name) ||
unknown's avatar
VIEW  
unknown committed
2752
	append_file_to_dir(thd, &lex->create_info.index_file_name,
2753
			   create_table->table_name))
2754
      goto unsent_create_error;
2755
#endif
2756
    /*
2757
      If we are using SET CHARSET without DEFAULT, add an implicit
2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768
      DEFAULT to not confuse old users. (This may change).
    */
    if ((lex->create_info.used_fields & 
	 (HA_CREATE_USED_DEFAULT_CHARSET | HA_CREATE_USED_CHARSET)) ==
	HA_CREATE_USED_CHARSET)
    {
      lex->create_info.used_fields&= ~HA_CREATE_USED_CHARSET;
      lex->create_info.used_fields|= HA_CREATE_USED_DEFAULT_CHARSET;
      lex->create_info.default_table_charset= lex->create_info.table_charset;
      lex->create_info.table_charset= 0;
    }
2769
    if (select_lex->item_list.elements)		// With select
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2770 2771
    {
      select_result *result;
2772

2773
      select_lex->options|= SELECT_NO_UNLOCK;
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2774
      unit->set_limit(select_lex, select_lex);
2775

unknown's avatar
VIEW  
unknown committed
2776
      if (!(res= open_and_lock_tables(thd, select_tables)))
2777
      {
2778 2779 2780 2781 2782 2783 2784
        /*
          Is table which we are changing used somewhere in other parts
          of query
        */
        if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
            unique_table(create_table, select_tables))
        {
2785
          my_error(ER_UPDATE_TABLE_USED, MYF(0), create_table->table_name);
2786
          goto unsent_create_error;
2787
        }
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2788 2789 2790 2791 2792 2793 2794 2795 2796 2797
        /* If we create merge table, we have to test tables in merge, too */
        if (lex->create_info.used_fields & HA_CREATE_USED_UNION)
        {
          TABLE_LIST *tab;
          for (tab= (TABLE_LIST*) lex->create_info.merge_list.first;
               tab;
               tab= tab->next_local)
          {
            if (unique_table(tab, select_tables))
            {
2798
              my_error(ER_UPDATE_TABLE_USED, MYF(0), tab->table_name);
2799
              goto unsent_create_error;
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2800 2801 2802
            }
          }
        }
2803

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VIEW  
unknown committed
2804 2805 2806 2807 2808
        if ((result= new select_create(create_table,
				       &lex->create_info,
				       lex->create_list,
				       lex->key_list,
				       select_lex->item_list,
2809 2810
				       lex->duplicates,
				       lex->ignore)))
2811 2812 2813 2814 2815 2816
        {
          /*
            CREATE from SELECT give its SELECT_LEX for SELECT,
            and item_list belong to SELECT
          */
          select_lex->resolve_mode= SELECT_LEX::SELECT_MODE;
2817
          res= handle_select(thd, lex, result, 0);
2818
          select_lex->resolve_mode= SELECT_LEX::NOMATTER_MODE;
2819
          delete result;
2820
        }
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2821
	/* reset for PS */
2822 2823
	lex->create_list.empty();
	lex->key_list.empty();
2824 2825
      }
    }
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2826
    else
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2827
    {
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2828
      /* regular create */
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2829
      if (lex->name)
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2830
        res= mysql_create_like_table(thd, create_table, &lex->create_info, 
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2831 2832
                                     (Table_ident *)lex->name); 
      else
2833
      {
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VIEW  
unknown committed
2834
        res= mysql_create_table(thd, create_table->db,
2835
				create_table->table_name, &lex->create_info,
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VIEW  
unknown committed
2836
				lex->create_list,
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2837
				lex->key_list, 0, 0);
2838
      }
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2839
      if (!res)
2840
	send_ok(thd);
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2841
    }
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VIEW  
unknown committed
2842
    lex->link_first_table_back(create_table, link_to_local);
2843 2844
    break;

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2845
    /* put tables back for PS rexecuting */
2846
unsent_create_error:
unknown's avatar
VIEW  
unknown committed
2847
    lex->link_first_table_back(create_table, link_to_local);
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2848
    goto error;
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2849
  }
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2850
  case SQLCOM_CREATE_INDEX:
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VIEW  
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2851 2852
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_one_table_access(thd, INDEX_ACL, all_tables))
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2853
      goto error; /* purecov: inspected */
2854
    thd->slow_command=TRUE;
2855
    if (end_active_trans(thd))
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2856
      goto error;
2857
    else
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VIEW  
unknown committed
2858
      res = mysql_create_index(thd, first_table, lex->key_list);
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2859 2860
    break;

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2861
#ifdef HAVE_REPLICATION
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2862
  case SQLCOM_SLAVE_START:
2863
  {
2864
    pthread_mutex_lock(&LOCK_active_mi);
2865
    start_slave(thd,active_mi,1 /* net report*/);
2866
    pthread_mutex_unlock(&LOCK_active_mi);
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2867
    break;
2868
  }
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2869
  case SQLCOM_SLAVE_STOP:
2870 2871 2872 2873 2874 2875
  /*
    If the client thread has locked tables, a deadlock is possible.
    Assume that
    - the client thread does LOCK TABLE t READ.
    - then the master updates t.
    - then the SQL slave thread wants to update t,
2876
      so it waits for the client thread because t is locked by it.
2877
    - then the client thread does SLAVE STOP.
2878 2879
      SLAVE STOP waits for the SQL slave thread to terminate its
      update t, which waits for the client thread because t is locked by it.
2880 2881 2882 2883 2884
    To prevent that, refuse SLAVE STOP if the
    client thread has locked tables
  */
  if (thd->locked_tables || thd->active_transaction())
  {
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2885 2886
    my_message(ER_LOCK_OR_ACTIVE_TRANSACTION, ER(ER_LOCK_OR_ACTIVE_TRANSACTION),
               MYF(0));
2887
    goto error;
2888
  }
2889
  {
2890
    pthread_mutex_lock(&LOCK_active_mi);
2891
    stop_slave(thd,active_mi,1/* net report*/);
2892
    pthread_mutex_unlock(&LOCK_active_mi);
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2893
    break;
2894
  }
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2895
#endif /* HAVE_REPLICATION */
2896

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2897
  case SQLCOM_ALTER_TABLE:
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VIEW  
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2898
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
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2899
#if defined(DONT_ALLOW_SHOW_COMMANDS)
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2900 2901
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
2902
    goto error;
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2903 2904
#else
    {
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2905
      ulong priv=0;
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2906
      if (lex->name && (!lex->name[0] || strlen(lex->name) > NAME_LEN))
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2907
      {
2908
	my_error(ER_WRONG_TABLE_NAME, MYF(0), lex->name);
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2909
        goto error;
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2910
      }
2911
      if (!select_lex->db)
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VIEW  
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2912 2913 2914
	select_lex->db= first_table->db;
      if (check_access(thd, ALTER_ACL, first_table->db,
		       &first_table->grant.privilege, 0, 0) ||
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2915
	  check_access(thd,INSERT_ACL | CREATE_ACL,select_lex->db,&priv,0,0)||
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VIEW  
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2916
	  check_merge_table_access(thd, first_table->db,
2917 2918 2919
				   (TABLE_LIST *)
				   lex->create_info.merge_list.first))
	goto error;				/* purecov: inspected */
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2920 2921
      if (grant_option)
      {
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VIEW  
unknown committed
2922
	if (check_grant(thd, ALTER_ACL, all_tables, 0, UINT_MAX, 0))
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2923 2924 2925 2926 2927
	  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));
2928
	  tmp_table.table_name=lex->name;
2929
	  tmp_table.db=select_lex->db;
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2930
	  tmp_table.grant.privilege=priv;
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2931 2932
	  if (check_grant(thd, INSERT_ACL | CREATE_ACL, &tmp_table, 0,
			  UINT_MAX, 0))
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2933 2934 2935
	    goto error;
	}
      }
2936 2937
      /* 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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2938
      /* ALTER TABLE ends previous transaction */
2939
      if (end_active_trans(thd))
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2940
	goto error;
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2941
      else
unknown's avatar
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2942
      {
2943
        thd->slow_command=TRUE;
2944
	res= mysql_alter_table(thd, select_lex->db, lex->name,
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2945
			       &lex->create_info,
unknown's avatar
VIEW  
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2946
			       first_table, lex->create_list,
2947
			       lex->key_list,
2948
			       select_lex->order_list.elements,
2949
                               (ORDER *) select_lex->order_list.first,
unknown's avatar
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2950 2951
			       lex->duplicates, lex->ignore, &lex->alter_info,
                               1);
unknown's avatar
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2952
      }
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2953 2954
      break;
    }
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2955
#endif /*DONT_ALLOW_SHOW_COMMANDS*/
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2956
  case SQLCOM_RENAME_TABLE:
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2957
  {
unknown's avatar
VIEW  
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2958
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
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2959
    TABLE_LIST *table;
unknown's avatar
VIEW  
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2960
    if (check_db_used(thd, all_tables))
unknown's avatar
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2961
      goto error;
unknown's avatar
VIEW  
unknown committed
2962
    for (table= first_table; table; table= table->next_local->next_local)
unknown's avatar
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2963
    {
unknown's avatar
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2964
      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
unknown's avatar
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2965
		       &table->grant.privilege,0,0) ||
unknown's avatar
VIEW  
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2966 2967
	  check_access(thd, INSERT_ACL | CREATE_ACL, table->next_local->db,
		       &table->next_local->grant.privilege, 0, 0))
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unknown committed
2968 2969 2970
	goto error;
      if (grant_option)
      {
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VIEW  
unknown committed
2971
	TABLE_LIST old_list, new_list;
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2972 2973 2974 2975
	/*
	  we do not need initialize old_list and new_list because we will
	  come table[0] and table->next[0] there
	*/
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VIEW  
unknown committed
2976 2977 2978 2979
	old_list= table[0];
	new_list= table->next_local[0];
	if (check_grant(thd, ALTER_ACL, &old_list, 0, 1, 0) ||
	    (!test_all_bits(table->next_local->grant.privilege,
2980
			    INSERT_ACL | CREATE_ACL) &&
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VIEW  
unknown committed
2981
	     check_grant(thd, INSERT_ACL | CREATE_ACL, &new_list, 0, 1, 0)))
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2982 2983 2984
	  goto error;
      }
    }
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VIEW  
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2985
    query_cache_invalidate3(thd, first_table, 0);
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2986 2987
    if (end_active_trans(thd) || mysql_rename_tables(thd, first_table))
      goto error;
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2988
    break;
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2989
  }
2990
#ifndef EMBEDDED_LIBRARY
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2991 2992
  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
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2993 2994
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
2995
    goto error;
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2996 2997
#else
    {
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2998
      if (check_global_access(thd, SUPER_ACL))
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2999 3000 3001 3002
	goto error;
      res = show_binlogs(thd);
      break;
    }
unknown's avatar
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3003
#endif
3004
#endif /* EMBEDDED_LIBRARY */
unknown's avatar
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3005
  case SQLCOM_SHOW_CREATE:
unknown's avatar
VIEW  
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3006
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
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3007
#ifdef DONT_ALLOW_SHOW_COMMANDS
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3008 3009
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
3010
    goto error;
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3011
#else
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3012
    {
3013 3014 3015 3016
      /* Ignore temporary tables if this is "SHOW CREATE VIEW" */
      if (lex->only_view)
        first_table->skip_temporary= 1;

unknown's avatar
VIEW  
unknown committed
3017 3018 3019
      if (check_db_used(thd, all_tables) ||
	  check_access(thd, SELECT_ACL | EXTRA_ACL, first_table->db,
		       &first_table->grant.privilege, 0, 0))
unknown's avatar
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3020
	goto error;
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3021
      if (grant_option && check_grant(thd, SELECT_ACL, all_tables, 2, UINT_MAX, 0))
3022
	goto error;
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3023
      res= mysqld_show_create(thd, first_table);
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3024 3025
      break;
    }
unknown's avatar
unknown committed
3026
#endif
3027 3028
  case SQLCOM_CHECKSUM:
  {
unknown's avatar
VIEW  
unknown committed
3029 3030 3031
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL | EXTRA_ACL, all_tables, 0))
3032
      goto error; /* purecov: inspected */
unknown's avatar
VIEW  
unknown committed
3033
    res = mysql_checksum_table(thd, first_table, &lex->check_opt);
3034 3035
    break;
  }
unknown's avatar
unknown committed
3036
  case SQLCOM_REPAIR:
3037
  {
unknown's avatar
VIEW  
unknown committed
3038 3039 3040
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
3041
      goto error; /* purecov: inspected */
3042
    thd->slow_command=TRUE;
unknown's avatar
VIEW  
unknown committed
3043
    res= mysql_repair_table(thd, first_table, &lex->check_opt);
3044 3045 3046 3047 3048
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      if (mysql_bin_log.is_open())
      {
unknown's avatar
unknown committed
3049
	thd->clear_error(); // No binlog error generated
3050
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3051 3052 3053
        mysql_bin_log.write(&qinfo);
      }
    }
3054 3055
    break;
  }
unknown's avatar
unknown committed
3056
  case SQLCOM_CHECK:
3057
  {
unknown's avatar
VIEW  
unknown committed
3058 3059 3060
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL | EXTRA_ACL , all_tables, 0))
3061
      goto error; /* purecov: inspected */
3062
    thd->slow_command=TRUE;
unknown's avatar
VIEW  
unknown committed
3063
    res = mysql_check_table(thd, first_table, &lex->check_opt);
3064 3065
    break;
  }
unknown's avatar
unknown committed
3066 3067
  case SQLCOM_ANALYZE:
  {
unknown's avatar
VIEW  
unknown committed
3068 3069 3070
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
unknown's avatar
unknown committed
3071
      goto error; /* purecov: inspected */
3072
    thd->slow_command=TRUE;
unknown's avatar
VIEW  
unknown committed
3073
    res = mysql_analyze_table(thd, first_table, &lex->check_opt);
3074 3075 3076 3077 3078
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      if (mysql_bin_log.is_open())
      {
unknown's avatar
unknown committed
3079
	thd->clear_error(); // No binlog error generated
3080
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3081 3082 3083
        mysql_bin_log.write(&qinfo);
      }
    }
unknown's avatar
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3084
    break;
unknown's avatar
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3085
  }
3086

unknown's avatar
unknown committed
3087 3088
  case SQLCOM_OPTIMIZE:
  {
unknown's avatar
VIEW  
unknown committed
3089 3090 3091
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
unknown's avatar
unknown committed
3092
      goto error; /* purecov: inspected */
3093
    thd->slow_command=TRUE;
3094
    res= (specialflag & (SPECIAL_SAFE_MODE | SPECIAL_NO_NEW_FUNC)) ?
unknown's avatar
VIEW  
unknown committed
3095 3096
      mysql_recreate_table(thd, first_table, 1) :
      mysql_optimize_table(thd, first_table, &lex->check_opt);
3097 3098 3099 3100 3101
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      if (mysql_bin_log.is_open())
      {
unknown's avatar
unknown committed
3102
	thd->clear_error(); // No binlog error generated
3103
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3104 3105 3106
        mysql_bin_log.write(&qinfo);
      }
    }
unknown's avatar
unknown committed
3107 3108 3109
    break;
  }
  case SQLCOM_UPDATE:
unknown's avatar
VIEW  
unknown committed
3110 3111
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (update_precheck(thd, all_tables))
unknown's avatar
unknown committed
3112
      break;
unknown's avatar
unknown committed
3113 3114 3115 3116 3117 3118 3119
    res= (result= mysql_update(thd, all_tables,
                               select_lex->item_list,
                               lex->value_list,
                               select_lex->where,
                               select_lex->order_list.elements,
                               (ORDER *) select_lex->order_list.first,
                               select_lex->select_limit,
3120
                               lex->duplicates, lex->ignore));
3121
    /* mysql_update return 2 if we need to switch to multi-update */
unknown's avatar
unknown committed
3122
    if (result != 2)
3123
      break;
3124
  case SQLCOM_UPDATE_MULTI:
3125
    {
unknown's avatar
unknown committed
3126
      DBUG_ASSERT(first_table == all_tables && first_table != 0);
3127
      /* if we switched from normal update, rights are checked */
unknown's avatar
unknown committed
3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140
      if (result != 2)
      {
        if ((res= multi_update_precheck(thd, all_tables)))
          break;
      }
      else
        res= 0;

      res= mysql_multi_update(thd, all_tables,
                              &select_lex->item_list,
                              &lex->value_list,
                              select_lex->where,
                              select_lex->options,
3141
                              lex->duplicates, lex->ignore, unit, select_lex);
unknown's avatar
unknown committed
3142
    break;
unknown's avatar
unknown committed
3143
  }
unknown's avatar
unknown committed
3144
  case SQLCOM_REPLACE:
3145 3146
  case SQLCOM_INSERT:
  {
unknown's avatar
VIEW  
unknown committed
3147
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
3148
    if ((res= insert_precheck(thd, all_tables)))
unknown's avatar
unknown committed
3149
      break;
unknown's avatar
VIEW  
unknown committed
3150
    res= mysql_insert(thd, all_tables, lex->field_list, lex->many_values,
unknown's avatar
unknown committed
3151
		      lex->update_list, lex->value_list,
3152
                      lex->duplicates, lex->ignore);
unknown's avatar
VIEW  
unknown committed
3153 3154
    if (first_table->view && !first_table->contain_auto_increment)
      thd->last_insert_id= 0; // do not show last insert ID if VIEW have not it
unknown's avatar
unknown committed
3155
    break;
3156
  }
unknown's avatar
unknown committed
3157 3158 3159
  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
unknown's avatar
VIEW  
unknown committed
3160
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
3161
    if ((res= insert_precheck(thd, all_tables)))
3162
      break;
unknown's avatar
unknown committed
3163

3164
    /* Fix lock for first table */
unknown's avatar
VIEW  
unknown committed
3165 3166
    if (first_table->lock_type == TL_WRITE_DELAYED)
      first_table->lock_type= TL_WRITE;
3167

3168 3169
    /* Don't unlock tables until command is written to binary log */
    select_lex->options|= SELECT_NO_UNLOCK;
unknown's avatar
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3170 3171

    select_result *result;
unknown's avatar
unknown committed
3172
    unit->set_limit(select_lex, select_lex);
unknown's avatar
unknown committed
3173

unknown's avatar
VIEW  
unknown committed
3174
    if (!(res= open_and_lock_tables(thd, all_tables)))
3175
    {
3176 3177
      /* Skip first table, which is the table we are inserting in */
      lex->select_lex.table_list.first= (byte*)first_table->next_local;
3178

3179 3180 3181
      res= mysql_insert_select_prepare(thd);
      if (!res && (result= new select_insert(first_table, first_table->table,
                                             &lex->field_list,
unknown's avatar
unknown committed
3182
                                             &lex->update_list, &lex->value_list,
3183
                                             lex->duplicates, lex->ignore)))
3184
      {
3185 3186 3187 3188 3189
        /*
          insert/replace from SELECT give its SELECT_LEX for SELECT,
          and item_list belong to SELECT
        */
	lex->select_lex.resolve_mode= SELECT_LEX::SELECT_MODE;
3190
	res= handle_select(thd, lex, result, OPTION_SETUP_TABLES_DONE);
3191
	lex->select_lex.resolve_mode= SELECT_LEX::INSERT_MODE;
3192 3193
        delete result;
      }
3194 3195
      /* revert changes for SP */
      lex->select_lex.table_list.first= (byte*) first_table;
3196
    }
unknown's avatar
VIEW  
unknown committed
3197 3198 3199 3200

    if (first_table->view && !first_table->contain_auto_increment)
      thd->last_insert_id= 0; // do not show last insert ID if VIEW have not it

unknown's avatar
unknown committed
3201 3202
    break;
  }
3203
  case SQLCOM_TRUNCATE:
unknown's avatar
VIEW  
unknown committed
3204 3205
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_one_table_access(thd, DELETE_ACL, all_tables))
unknown's avatar
unknown committed
3206
      goto error;
3207 3208 3209 3210
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
3211
    if ((thd->locked_tables && !lex->sphead) || thd->active_transaction())
3212
    {
unknown's avatar
unknown committed
3213 3214
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3215 3216
      goto error;
    }
unknown's avatar
VIEW  
unknown committed
3217

unknown's avatar
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3218
    res= mysql_truncate(thd, first_table, 0);
3219
    break;
unknown's avatar
unknown committed
3220
  case SQLCOM_DELETE:
unknown's avatar
unknown committed
3221
  {
unknown's avatar
VIEW  
unknown committed
3222 3223
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if ((res= delete_precheck(thd, all_tables)))
unknown's avatar
unknown committed
3224
      break;
unknown's avatar
VIEW  
unknown committed
3225
    res = mysql_delete(thd, all_tables, select_lex->where,
3226
                       &select_lex->order_list,
unknown's avatar
unknown committed
3227
                       select_lex->select_limit, select_lex->options);
unknown's avatar
unknown committed
3228 3229
    break;
  }
3230
  case SQLCOM_DELETE_MULTI:
unknown's avatar
unknown committed
3231
  {
unknown's avatar
VIEW  
unknown committed
3232
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3233 3234
    TABLE_LIST *aux_tables=
      (TABLE_LIST *)thd->lex->auxilliary_table_list.first;
unknown's avatar
unknown committed
3235
    uint table_count;
unknown's avatar
unknown committed
3236
    multi_delete *result;
unknown's avatar
unknown committed
3237

unknown's avatar
VIEW  
unknown committed
3238
    if ((res= multi_delete_precheck(thd, all_tables, &table_count)))
3239
      break;
unknown's avatar
unknown committed
3240

unknown's avatar
unknown committed
3241
    /* condition will be TRUE on SP re-excuting */
3242 3243
    if (select_lex->item_list.elements != 0)
      select_lex->item_list.empty();
unknown's avatar
unknown committed
3244
    if (add_item_to_list(thd, new Item_null()))
unknown's avatar
unknown committed
3245
      goto error;
3246

unknown's avatar
unknown committed
3247
    thd->proc_info="init";
unknown's avatar
VIEW  
unknown committed
3248 3249 3250 3251
    if ((res= open_and_lock_tables(thd, all_tables)))
      break;

    if ((res= mysql_multi_delete_prepare(thd)))
unknown's avatar
unknown committed
3252
      goto error;
3253

3254 3255
    if (!thd->is_fatal_error && (result= new multi_delete(thd,aux_tables,
							  table_count)))
unknown's avatar
unknown committed
3256
    {
3257 3258 3259
      res= mysql_select(thd, &select_lex->ref_pointer_array,
			select_lex->get_table_list(),
			select_lex->with_wild,
3260
			select_lex->item_list,
unknown's avatar
unknown committed
3261
			select_lex->where,
3262
			0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
unknown's avatar
unknown committed
3263 3264
			(ORDER *)NULL,
			select_lex->options | thd->options |
3265 3266
			SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK |
                        OPTION_SETUP_TABLES_DONE,
3267
			result, unit, select_lex);
3268
      delete result;
unknown's avatar
unknown committed
3269 3270
    }
    else
3271
      res= TRUE;                                // Error
unknown's avatar
unknown committed
3272 3273
    break;
  }
unknown's avatar
unknown committed
3274
  case SQLCOM_DROP_TABLE:
unknown's avatar
unknown committed
3275
  {
unknown's avatar
VIEW  
unknown committed
3276
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3277 3278
    if (!lex->drop_temporary)
    {
unknown's avatar
VIEW  
unknown committed
3279
      if (check_table_access(thd, DROP_ACL, all_tables, 0))
3280 3281
	goto error;				/* purecov: inspected */
      if (end_active_trans(thd))
unknown's avatar
unknown committed
3282
        goto error;
3283
    }
unknown's avatar
unknown committed
3284
    else
unknown's avatar
unknown committed
3285 3286 3287 3288 3289 3290
    {
      /*
	If this is a slave thread, we may sometimes execute some 
	DROP / * 40005 TEMPORARY * / TABLE
	that come from parts of binlogs (likely if we use RESET SLAVE or CHANGE
	MASTER TO), while the temporary table has already been dropped.
unknown's avatar
unknown committed
3291 3292
	To not generate such irrelevant "table does not exist errors",
	we silently add IF EXISTS if TEMPORARY was used.
unknown's avatar
unknown committed
3293 3294 3295 3296
      */
      if (thd->slave_thread)
	lex->drop_if_exists= 1;
    }
unknown's avatar
VIEW  
unknown committed
3297 3298
    res= mysql_rm_table(thd, first_table, lex->drop_if_exists,
			lex->drop_temporary);
unknown's avatar
unknown committed
3299 3300
  }
  break;
unknown's avatar
unknown committed
3301
  case SQLCOM_DROP_INDEX:
unknown's avatar
VIEW  
unknown committed
3302 3303
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_one_table_access(thd, INDEX_ACL, all_tables))
unknown's avatar
unknown committed
3304
      goto error;				/* purecov: inspected */
3305
    if (end_active_trans(thd))
unknown's avatar
unknown committed
3306
      goto error;
3307
    else
unknown's avatar
VIEW  
unknown committed
3308
      res = mysql_drop_index(thd, first_table, &lex->alter_info);
unknown's avatar
unknown committed
3309 3310
    break;
  case SQLCOM_SHOW_PROCESSLIST:
unknown's avatar
unknown committed
3311
    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
unknown's avatar
unknown committed
3312
      break;
unknown's avatar
unknown committed
3313 3314
    mysqld_list_processes(thd,
			  thd->master_access & PROCESS_ACL ? NullS :
unknown's avatar
unknown committed
3315
			  thd->priv_user,lex->verbose);
unknown's avatar
unknown committed
3316
    break;
unknown's avatar
unknown committed
3317 3318
  case SQLCOM_SHOW_STORAGE_ENGINES:
    res= mysqld_show_storage_engines(thd);
unknown's avatar
unknown committed
3319 3320 3321 3322 3323 3324 3325
    break;
  case SQLCOM_SHOW_PRIVILEGES:
    res= mysqld_show_privileges(thd);
    break;
  case SQLCOM_SHOW_COLUMN_TYPES:
    res= mysqld_show_column_types(thd);
    break;
unknown's avatar
unknown committed
3326 3327
  case SQLCOM_SHOW_LOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
unknown's avatar
unknown committed
3328 3329
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0));	/* purecov: inspected */
3330
    goto error;
unknown's avatar
unknown committed
3331 3332
#else
    {
unknown's avatar
unknown committed
3333
      if (grant_option && check_access(thd, FILE_ACL, any_db,0,0,0))
unknown's avatar
unknown committed
3334 3335 3336 3337
	goto error;
      res= mysqld_show_logs(thd);
      break;
    }
unknown's avatar
unknown committed
3338 3339
#endif
  case SQLCOM_CHANGE_DB:
3340
    mysql_change_db(thd,select_lex->db);
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3341
    break;
3342

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3343 3344
  case SQLCOM_LOAD:
  {
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VIEW  
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3345
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
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3346
    uint privilege= (lex->duplicates == DUP_REPLACE ?
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3347 3348
		     INSERT_ACL | DELETE_ACL : INSERT_ACL) |
                    (lex->local_file ? 0 : FILE_ACL);
3349

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3350
    if (lex->local_file)
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unknown committed
3351
    {
3352
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
unknown's avatar
unknown committed
3353
	  ! opt_local_infile)
3354
      {
unknown's avatar
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3355
	my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND), MYF(0));
3356 3357
	goto error;
      }
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3358
    }
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3359 3360 3361 3362

    if (check_one_table_access(thd, privilege, all_tables))
      goto error;

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VIEW  
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3363
    res= mysql_load(thd, lex->exchange, first_table, lex->field_list,
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3364
                    lex->update_list, lex->value_list, lex->duplicates,
3365
                    lex->ignore, (bool) lex->local_file);
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unknown committed
3366 3367
    break;
  }
3368

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3369
  case SQLCOM_SET_OPTION:
3370 3371
  {
    List<set_var_base> *lex_var_list= &lex->var_list;
3372
    if ((check_table_access(thd, SELECT_ACL, all_tables, 0) ||
unknown's avatar
unknown committed
3373 3374
	 open_and_lock_tables(thd, all_tables)))
      goto error;
3375 3376
    if (lex->one_shot_set && not_all_support_one_shot(lex_var_list))
    {
unknown's avatar
unknown committed
3377 3378
      my_error(ER_RESERVED_SYNTAX, MYF(0), "SET ONE_SHOT");
      goto error;
3379 3380 3381 3382 3383 3384 3385 3386
    }
    if (!(res= sql_set_variables(thd, lex_var_list)))
    {
      /*
        If the previous command was a SET ONE_SHOT, we don't want to forget
        about the ONE_SHOT property of that SET. So we use a |= instead of = .
      */
      thd->one_shot_set|= lex->one_shot_set;
3387
      send_ok(thd);
3388
    }
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3389
    break;
3390
  }
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3391

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3392
  case SQLCOM_UNLOCK_TABLES:
3393 3394 3395 3396 3397 3398
    /*
      It is critical for mysqldump --single-transaction --master-data that
      UNLOCK TABLES does not implicitely commit a connection which has only
      done FLUSH TABLES WITH READ LOCK + BEGIN. If this assumption becomes
      false, mysqldump will not work.
    */
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3399
    unlock_locked_tables(thd);
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3400 3401
    if (thd->options & OPTION_TABLE_LOCK)
    {
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3402
      end_active_trans(thd);
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3403
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
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3404 3405
    }
    if (thd->global_read_lock)
3406
      unlock_global_read_lock(thd);
3407
    send_ok(thd);
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3408 3409
    break;
  case SQLCOM_LOCK_TABLES:
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3410
    unlock_locked_tables(thd);
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VIEW  
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3411
    if (check_db_used(thd, all_tables) || end_active_trans(thd))
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3412
      goto error;
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VIEW  
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3413
    if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, all_tables, 0))
3414
      goto error;
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3415
    thd->in_lock_tables=1;
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3416
    thd->options|= OPTION_TABLE_LOCK;
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VIEW  
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3417

3418
    if (!(res= simple_open_n_lock_tables(thd, all_tables)))
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3419
    {
3420 3421
#ifdef HAVE_QUERY_CACHE
      if (thd->variables.query_cache_wlock_invalidate)
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VIEW  
unknown committed
3422
	query_cache.invalidate_locked_for_write(first_table);
3423
#endif /*HAVE_QUERY_CACHE*/
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3424 3425
      thd->locked_tables=thd->lock;
      thd->lock=0;
3426
      send_ok(thd);
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3427
    }
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3428 3429
    else
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
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3430 3431 3432
    thd->in_lock_tables=0;
    break;
  case SQLCOM_CREATE_DB:
3433
  {
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3434
    char *alias;
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3435
    if (!(alias=thd->strdup(lex->name)) || check_db_name(lex->name))
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3436
    {
3437
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
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3438 3439
      break;
    }
3440 3441 3442
    /*
      If in a slave thread :
      CREATE DATABASE DB was certainly not preceded by USE DB.
3443
      For that reason, db_ok() in sql/slave.cc did not check the
3444 3445 3446
      do_db/ignore_db. And as this query involves no tables, tables_ok()
      above was not called. So we have to check rules again here.
    */
3447
#ifdef HAVE_REPLICATION
3448
    if (thd->slave_thread &&
3449 3450
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
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3451
    {
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3452
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
3453
      break;
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3454
    }
3455
#endif
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3456
    if (check_access(thd,CREATE_ACL,lex->name,0,1,0))
3457
      break;
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3458
    res= mysql_create_db(thd,(lower_case_table_names == 2 ? alias : lex->name),
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unknown committed
3459
			 &lex->create_info, 0);
3460 3461
    break;
  }
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3462
  case SQLCOM_DROP_DB:
3463
  {
3464
    if (check_db_name(lex->name))
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unknown committed
3465
    {
3466
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
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3467 3468
      break;
    }
3469 3470 3471 3472 3473 3474 3475
    /*
      If in a slave thread :
      DROP DATABASE DB may not be preceded by USE DB.
      For that reason, maybe db_ok() in sql/slave.cc did not check the 
      do_db/ignore_db. And as this query involves no tables, tables_ok()
      above was not called. So we have to check rules again here.
    */
3476
#ifdef HAVE_REPLICATION
3477 3478 3479
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
unknown's avatar
unknown committed
3480
    {
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unknown committed
3481
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
3482
      break;
unknown's avatar
unknown committed
3483
    }
3484
#endif
unknown's avatar
unknown committed
3485
    if (check_access(thd,DROP_ACL,lex->name,0,1,0))
3486
      break;
3487 3488
    if (thd->locked_tables || thd->active_transaction())
    {
unknown's avatar
unknown committed
3489 3490
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3491 3492
      goto error;
    }
3493
    res= mysql_rm_db(thd, lex->name, lex->drop_if_exists, 0);
3494 3495
    break;
  }
3496 3497
  case SQLCOM_ALTER_DB:
  {
3498 3499
    char *db= lex->name ? lex->name : thd->db;
    if (!db)
3500
    {
unknown's avatar
unknown committed
3501 3502
      my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
      break;
3503 3504
    }
    if (!strip_sp(db) || check_db_name(db))
3505
    {
3506
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
3507 3508
      break;
    }
unknown's avatar
unknown committed
3509 3510 3511
    /*
      If in a slave thread :
      ALTER DATABASE DB may not be preceded by USE DB.
3512
      For that reason, maybe db_ok() in sql/slave.cc did not check the
unknown's avatar
unknown committed
3513 3514 3515 3516
      do_db/ignore_db. And as this query involves no tables, tables_ok()
      above was not called. So we have to check rules again here.
    */
#ifdef HAVE_REPLICATION
3517
    if (thd->slave_thread &&
3518 3519
	(!db_ok(db, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(db)))
unknown's avatar
unknown committed
3520
    {
unknown's avatar
unknown committed
3521
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
unknown's avatar
unknown committed
3522 3523 3524
      break;
    }
#endif
3525
    if (check_access(thd, ALTER_ACL, db, 0, 1, 0))
3526 3527 3528
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
unknown's avatar
unknown committed
3529 3530
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3531 3532
      goto error;
    }
3533
    res= mysql_alter_db(thd, db, &lex->create_info);
3534 3535
    break;
  }
unknown's avatar
unknown committed
3536 3537 3538 3539
  case SQLCOM_SHOW_CREATE_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
3540
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
unknown's avatar
unknown committed
3541 3542
      break;
    }
unknown's avatar
unknown committed
3543
    if (check_access(thd,SELECT_ACL,lex->name,0,1,0))
unknown's avatar
unknown committed
3544
      break;
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unknown committed
3545
    res=mysqld_show_create_db(thd,lex->name,&lex->create_info);
unknown's avatar
unknown committed
3546 3547
    break;
  }
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3548
  case SQLCOM_CREATE_FUNCTION:                  // UDF function
unknown's avatar
unknown committed
3549 3550 3551
  {
    if (check_access(thd,INSERT_ACL,"mysql",0,1,0))
      break;
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3552
#ifdef HAVE_DLOPEN
3553
    if (sp_find_function(thd, lex->spname))
unknown's avatar
unknown committed
3554
    {
3555
      my_error(ER_UDF_EXISTS, MYF(0), lex->spname->m_name.str);
unknown's avatar
unknown committed
3556 3557
      goto error;
    }
3558
    if (!(res = mysql_create_function(thd, &lex->udf)))
unknown's avatar
unknown committed
3559
      send_ok(thd);
unknown's avatar
unknown committed
3560
#else
unknown's avatar
unknown committed
3561
    res= TRUE;
unknown's avatar
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3562 3563
#endif
    break;
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unknown committed
3564
  }
unknown's avatar
unknown committed
3565
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3566 3567
  case SQLCOM_CREATE_USER:
  {
3568 3569
    if (check_access(thd, INSERT_ACL, "mysql", 0, 1, 1) &&
        check_global_access(thd,CREATE_USER_ACL))
3570 3571 3572 3573 3574
      break;
    if (!(res= mysql_create_user(thd, lex->users_list)))
    {
      if (mysql_bin_log.is_open())
      {
unknown's avatar
unknown committed
3575
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3576 3577 3578 3579 3580 3581
        mysql_bin_log.write(&qinfo);
      }
      send_ok(thd);
    }
    break;
  }
3582 3583
  case SQLCOM_DROP_USER:
  {
3584 3585
    if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 1) &&
        check_global_access(thd,CREATE_USER_ACL))
3586 3587 3588 3589 3590
      break;
    if (!(res= mysql_drop_user(thd, lex->users_list)))
    {
      if (mysql_bin_log.is_open())
      {
unknown's avatar
unknown committed
3591
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3592 3593 3594 3595 3596 3597 3598 3599
        mysql_bin_log.write(&qinfo);
      }
      send_ok(thd);
    }
    break;
  }
  case SQLCOM_RENAME_USER:
  {
3600 3601
    if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1) &&
        check_global_access(thd,CREATE_USER_ACL))
3602 3603 3604 3605 3606
      break;
    if (!(res= mysql_rename_user(thd, lex->users_list)))
    {
      if (mysql_bin_log.is_open())
      {
unknown's avatar
unknown committed
3607
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3608
        mysql_bin_log.write(&qinfo);
3609 3610 3611 3612 3613 3614 3615
      }
      send_ok(thd);
    }
    break;
  }
  case SQLCOM_REVOKE_ALL:
  {
3616 3617
    if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1) &&
        check_global_access(thd,CREATE_USER_ACL))
3618 3619 3620 3621 3622
      break;
    if (!(res = mysql_revoke_all(thd, lex->users_list)))
    {
      if (mysql_bin_log.is_open())
      {
3623
	Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3624 3625 3626 3627 3628 3629
	mysql_bin_log.write(&qinfo);
      }
      send_ok(thd);
    }
    break;
  }
3630 3631 3632 3633
  case SQLCOM_REVOKE:
  case SQLCOM_GRANT:
  {
    if (check_access(thd, lex->grant | lex->grant_tot_col | GRANT_ACL,
unknown's avatar
unknown committed
3634
		     first_table ?  first_table->db : select_lex->db,
unknown's avatar
VIEW  
unknown committed
3635 3636
		     first_table ? &first_table->grant.privilege : 0,
		     first_table ? 0 : 1, 0))
3637 3638
      goto error;

unknown's avatar
unknown committed
3639 3640 3641
    if (thd->user)				// If not replication
    {
      LEX_USER *user;
3642 3643
      uint counter;

unknown's avatar
unknown committed
3644
      List_iterator <LEX_USER> user_list(lex->users_list);
3645
      while ((user= user_list++))
unknown's avatar
unknown committed
3646
      {
3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667
        if (specialflag & SPECIAL_NO_RESOLVE &&
            hostname_requires_resolving(user->host.str))
          push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                              ER_WARN_HOSTNAME_WONT_WORK,
                              ER(ER_WARN_HOSTNAME_WONT_WORK),
                              user->host.str);
        // Are we trying to change a password of another user
        DBUG_ASSERT(user->host.str != 0);
        if (strcmp(thd->user, user->user.str) ||
            my_strcasecmp(system_charset_info,
                          user->host.str, thd->host_or_ip))
        {
          // TODO: use check_change_password()
          if (check_acl_user(user, &counter) && user->password.str &&
              check_access(thd, UPDATE_ACL,"mysql",0,1,1))
          {
            my_message(ER_PASSWORD_NOT_ALLOWED,
                       ER(ER_PASSWORD_NOT_ALLOWED), MYF(0));
            goto error;
          }
        }
unknown's avatar
SCRUM  
unknown committed
3668 3669
      }
    }
unknown's avatar
VIEW  
unknown committed
3670
    if (first_table)
3671
    {
3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695
      if (!lex->columns.elements && 
          sp_exists_routine(thd, all_tables, 1, 1))
      {
        uint grants= lex->all_privileges 
		   ? (PROC_ACLS & ~GRANT_ACL) | (lex->grant & GRANT_ACL)
		   : lex->grant;
        if (grant_option && 
	    check_grant_procedure(thd, grants | GRANT_ACL, all_tables, 0))
	  goto error;
        res= mysql_procedure_grant(thd, all_tables, lex->users_list,
				   grants, lex->sql_command == SQLCOM_REVOKE,0);
      }
      else
      {
	if (grant_option && check_grant(thd,
					(lex->grant | lex->grant_tot_col |
					 GRANT_ACL),
					all_tables, 0, UINT_MAX, 0))
	  goto error;
        res= mysql_table_grant(thd, all_tables, lex->users_list,
			       lex->columns, lex->grant,
			       lex->sql_command == SQLCOM_REVOKE);
      }
      if (!res && mysql_bin_log.is_open())
3696
      {
unknown's avatar
unknown committed
3697
        thd->clear_error();
unknown's avatar
unknown committed
3698
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3699
        mysql_bin_log.write(&qinfo);
3700 3701 3702 3703 3704 3705
      }
    }
    else
    {
      if (lex->columns.elements)
      {
unknown's avatar
unknown committed
3706 3707
	my_message(ER_ILLEGAL_GRANT_FOR_TABLE, ER(ER_ILLEGAL_GRANT_FOR_TABLE),
                   MYF(0));
unknown's avatar
unknown committed
3708
        goto error;
3709 3710 3711 3712 3713 3714 3715 3716
      }
      else
	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
			  lex->sql_command == SQLCOM_REVOKE);
      if (!res)
      {
	if (mysql_bin_log.is_open())
	{
unknown's avatar
unknown committed
3717
          thd->clear_error();
3718
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3719 3720
	  mysql_bin_log.write(&qinfo);
	}
3721
	if (lex->sql_command == SQLCOM_GRANT)
3722
	{
unknown's avatar
unknown committed
3723 3724 3725
	  List_iterator <LEX_USER> str_list(lex->users_list);
	  LEX_USER *user;
	  while ((user=str_list++))
unknown's avatar
unknown committed
3726
	    reset_mqh(user);
3727
	}
3728 3729 3730 3731
      }
    }
    break;
  }
unknown's avatar
SCRUM  
unknown committed
3732
#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/
unknown's avatar
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3733
  case SQLCOM_RESET:
3734 3735 3736
    /*
      RESET commands are never written to the binary log, so we have to
      initialize this variable because RESET shares the same code as FLUSH
3737 3738 3739 3740
    */
    lex->no_write_to_binlog= 1;
  case SQLCOM_FLUSH:
  {
unknown's avatar
VIEW  
unknown committed
3741
    if (check_global_access(thd,RELOAD_ACL) || check_db_used(thd, all_tables))
unknown's avatar
unknown committed
3742
      goto error;
3743 3744 3745 3746 3747
    /*
      reload_acl_and_cache() will tell us if we are allowed to write to the
      binlog or not.
    */
    bool write_to_binlog;
unknown's avatar
unknown committed
3748
    if (!reload_acl_and_cache(thd, lex->type, first_table, &write_to_binlog))
3749 3750 3751 3752 3753 3754 3755 3756 3757
    {
      /*
        We WANT to write and we CAN write.
        ! we write after unlocking the table.
      */
      if (!lex->no_write_to_binlog && write_to_binlog)
      {
        if (mysql_bin_log.is_open())
        {
3758
          Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3759 3760 3761 3762 3763
          mysql_bin_log.write(&qinfo);
        }
      }
      send_ok(thd);
    }
unknown's avatar
unknown committed
3764
    break;
3765
  }
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3766
  case SQLCOM_KILL:
3767 3768 3769
  {
    Item *it= (Item *)lex->value_list.head();

unknown's avatar
unknown committed
3770
    if ((!it->fixed && it->fix_fields(lex->thd, 0, &it)) || it->check_cols(1))
3771 3772 3773 3774 3775 3776
    {
      my_message(ER_SET_CONSTANTS_ONLY, ER(ER_SET_CONSTANTS_ONLY),
		 MYF(0));
      goto error;
    }
    kill_one_thread(thd, (ulong)it->val_int(), lex->type & ONLY_KILL_QUERY);
unknown's avatar
unknown committed
3777
    break;
3778
  }
unknown's avatar
unknown committed
3779
#ifndef NO_EMBEDDED_ACCESS_CHECKS
unknown's avatar
unknown committed
3780
  case SQLCOM_SHOW_GRANTS:
3781 3782
    if ((thd->priv_user &&
	 !strcmp(thd->priv_user,lex->grant_user->user.str)) ||
unknown's avatar
unknown committed
3783
	!check_access(thd, SELECT_ACL, "mysql",0,1,0))
unknown's avatar
unknown committed
3784 3785 3786 3787
    {
      res = mysql_show_grants(thd,lex->grant_user);
    }
    break;
unknown's avatar
unknown committed
3788
#endif
3789
  case SQLCOM_HA_OPEN:
unknown's avatar
VIEW  
unknown committed
3790 3791 3792
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL, all_tables, 0))
3793
      goto error;
unknown's avatar
unknown committed
3794
    res= mysql_ha_open(thd, first_table, 0);
3795 3796
    break;
  case SQLCOM_HA_CLOSE:
unknown's avatar
VIEW  
unknown committed
3797 3798
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables))
3799
      goto error;
unknown's avatar
VIEW  
unknown committed
3800
    res= mysql_ha_close(thd, first_table);
3801 3802
    break;
  case SQLCOM_HA_READ:
unknown's avatar
VIEW  
unknown committed
3803
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3804 3805 3806 3807 3808
    /*
      There is no need to check for table permissions here, because
      if a user has no permissions to read a table, he won't be
      able to open it (with SQLCOM_HA_OPEN) in the first place.
    */
unknown's avatar
VIEW  
unknown committed
3809
    if (check_db_used(thd, all_tables))
3810
      goto error;
3811
    res= mysql_ha_read(thd, first_table, lex->ha_read_mode, lex->ident.str,
unknown's avatar
VIEW  
unknown committed
3812 3813
                       lex->insert_list, lex->ha_rkey_mode, select_lex->where,
                       select_lex->select_limit, select_lex->offset_limit);
3814 3815
    break;

unknown's avatar
unknown committed
3816
  case SQLCOM_BEGIN:
unknown's avatar
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3817
    if (begin_trans(thd))
unknown's avatar
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3818
      goto error;
unknown's avatar
unknown committed
3819
    send_ok(thd);
unknown's avatar
unknown committed
3820 3821
    break;
  case SQLCOM_COMMIT:
3822
    if (end_trans(thd, lex->tx_release ? COMMIT_RELEASE :
unknown's avatar
unknown committed
3823
                              lex->tx_chain ? COMMIT_AND_CHAIN : COMMIT))
unknown's avatar
unknown committed
3824
      goto error;
3825
    send_ok(thd);
unknown's avatar
unknown committed
3826 3827
    break;
  case SQLCOM_ROLLBACK:
3828
    if (end_trans(thd, lex->tx_release ? ROLLBACK_RELEASE :
unknown's avatar
unknown committed
3829
                              lex->tx_chain ? ROLLBACK_AND_CHAIN : ROLLBACK))
unknown's avatar
unknown committed
3830
      goto error;
3831
    send_ok(thd);
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unknown committed
3832
    break;
unknown's avatar
unknown committed
3833
  case SQLCOM_RELEASE_SAVEPOINT:
unknown's avatar
unknown committed
3834
  {
3835 3836
    SAVEPOINT *sv;
    for (sv=thd->transaction.savepoints; sv; sv=sv->prev)
unknown's avatar
unknown committed
3837 3838 3839
    {
      if (my_strnncoll(system_charset_info,
                       (uchar *)lex->ident.str, lex->ident.length,
3840
                       (uchar *)sv->name, sv->length) == 0)
unknown's avatar
unknown committed
3841 3842
        break;
    }
3843
    if (sv)
unknown's avatar
unknown committed
3844
    {
3845
      if (ha_release_savepoint(thd, sv))
unknown's avatar
unknown committed
3846
        res= TRUE; // cannot happen
unknown's avatar
unknown committed
3847 3848
      else
        send_ok(thd);
3849
      thd->transaction.savepoints=sv->prev;
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unknown committed
3850
    }
3851
    else
unknown's avatar
unknown committed
3852
      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str);
unknown's avatar
unknown committed
3853
    break;
unknown's avatar
unknown committed
3854
  }
unknown's avatar
unknown committed
3855
  case SQLCOM_ROLLBACK_TO_SAVEPOINT:
unknown's avatar
unknown committed
3856
  {
3857 3858
    SAVEPOINT *sv;
    for (sv=thd->transaction.savepoints; sv; sv=sv->prev)
3859 3860 3861
    {
      if (my_strnncoll(system_charset_info,
                       (uchar *)lex->ident.str, lex->ident.length,
3862
                       (uchar *)sv->name, sv->length) == 0)
3863 3864
        break;
    }
3865
    if (sv)
3866
    {
3867
      if (ha_rollback_to_savepoint(thd, sv))
3868 3869
        res= TRUE; // cannot happen
      else
unknown's avatar
unknown committed
3870 3871 3872 3873 3874 3875 3876 3877
      {
        if ((thd->options & OPTION_STATUS_NO_TRANS_UPDATE) &&
            !thd->slave_thread)
          push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                       ER_WARNING_NOT_COMPLETE_ROLLBACK,
                       ER(ER_WARNING_NOT_COMPLETE_ROLLBACK));
        send_ok(thd);
      }
3878
      thd->transaction.savepoints=sv;
unknown's avatar
unknown committed
3879 3880
    }
    else
3881
      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str);
unknown's avatar
unknown committed
3882
    break;
3883
  }
3884
  case SQLCOM_SAVEPOINT:
3885 3886
    if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) ||
        !opt_using_transactions)
unknown's avatar
unknown committed
3887
      send_ok(thd);
unknown's avatar
unknown committed
3888
    else
3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926
    {
      SAVEPOINT **sv, *newsv;
      for (sv=&thd->transaction.savepoints; *sv; sv=&(*sv)->prev)
      {
        if (my_strnncoll(system_charset_info,
                         (uchar *)lex->ident.str, lex->ident.length,
                         (uchar *)(*sv)->name, (*sv)->length) == 0)
          break;
      }
      if (*sv) /* old savepoint of the same name exists */
      {
        newsv=*sv;
        ha_release_savepoint(thd, *sv); // it cannot fail
        *sv=(*sv)->prev;
      }
      else if ((newsv=(SAVEPOINT *) alloc_root(&thd->transaction.mem_root,
                                               savepoint_alloc_size)) == 0)
      {
        my_error(ER_OUT_OF_RESOURCES, MYF(0));
        break;
      }
      newsv->name=strmake_root(&thd->transaction.mem_root,
                               lex->ident.str, lex->ident.length);
      newsv->length=lex->ident.length;
      /*
        if we'll get an error here, don't add new savepoint to the list.
        we'll lose a little bit of memory in transaction mem_root, but it'll
        be free'd when transaction ends anyway
      */
      if (ha_savepoint(thd, newsv))
        res= TRUE;
      else
      {
        newsv->prev=thd->transaction.savepoints;
        thd->transaction.savepoints=newsv;
        send_ok(thd);
      }
    }
unknown's avatar
unknown committed
3927
    break;
3928 3929
  case SQLCOM_CREATE_PROCEDURE:
  case SQLCOM_CREATE_SPFUNCTION:
unknown's avatar
unknown committed
3930
  {
3931
    uint namelen;
3932
    char *name, *db;
unknown's avatar
unknown committed
3933
    int result;
3934

3935
    DBUG_ASSERT(lex->sphead != 0);
3936

3937
    if (check_access(thd, CREATE_PROC_ACL, lex->sphead->m_db.str, 0, 0, 0))
3938 3939 3940 3941 3942 3943
    {
      delete lex->sphead;
      lex->sphead= 0;
      goto error;
    }

3944 3945 3946
    if (!lex->sphead->m_db.str || !lex->sphead->m_db.str[0])
    {
      lex->sphead->m_db.length= strlen(thd->db);
unknown's avatar
unknown committed
3947 3948
      lex->sphead->m_db.str= strmake_root(thd->mem_root, thd->db,
                                           lex->sphead->m_db.length);
3949
    }
3950 3951

    name= lex->sphead->name(&namelen);
3952
#ifdef HAVE_DLOPEN
unknown's avatar
unknown committed
3953 3954 3955
    if (lex->sphead->m_type == TYPE_ENUM_FUNCTION)
    {
      udf_func *udf = find_udf(name, namelen);
3956

unknown's avatar
unknown committed
3957
      if (udf)
3958
      {
3959
	my_error(ER_UDF_EXISTS, MYF(0), name);
unknown's avatar
unknown committed
3960
	delete lex->sphead;
3961
	lex->sphead= 0;
3962
	goto error;
3963
      }
unknown's avatar
unknown committed
3964 3965 3966 3967 3968
    }
#endif
    if (lex->sphead->m_type == TYPE_ENUM_FUNCTION &&
	!lex->sphead->m_has_return)
    {
3969
      my_error(ER_SP_NORETURN, MYF(0), name);
unknown's avatar
unknown committed
3970
      delete lex->sphead;
3971
      lex->sphead= 0;
unknown's avatar
unknown committed
3972 3973 3974
      goto error;
    }

3975 3976
    name= thd->strdup(name); 
    db= thd->strmake(lex->sphead->m_db.str, lex->sphead->m_db.length);
unknown's avatar
unknown committed
3977 3978
    res= (result= lex->sphead->create(thd));
    switch (result) {
unknown's avatar
unknown committed
3979
    case SP_OK:
3980
      lex->unit.cleanup();
unknown's avatar
unknown committed
3981 3982
      delete lex->sphead;
      lex->sphead= 0;
unknown's avatar
unknown committed
3983
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994
      /* only add privileges if really neccessary */
      if (sp_automatic_privileges &&
          check_procedure_access(thd, DEFAULT_CREATE_PROC_ACLS,
      				 db, name, 1))
      {
        close_thread_tables(thd);
        if (sp_grant_privileges(thd, db, name))
          push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 
	  	       ER_PROC_AUTO_GRANT_FAIL,
		       ER(ER_PROC_AUTO_GRANT_FAIL));
      }
unknown's avatar
unknown committed
3995
#endif
3996
      send_ok(thd);
3997
      break;
unknown's avatar
unknown committed
3998
    case SP_WRITE_ROW_FAILED:
3999
      my_error(ER_SP_ALREADY_EXISTS, MYF(0), SP_TYPE_STRING(lex), name);
4000
      lex->unit.cleanup();
unknown's avatar
unknown committed
4001 4002 4003
      delete lex->sphead;
      lex->sphead= 0;
      goto error;
4004
    case SP_NO_DB_ERROR:
4005
      my_error(ER_BAD_DB_ERROR, MYF(0), lex->sphead->m_db.str);
4006
      lex->unit.cleanup();
4007 4008 4009
      delete lex->sphead;
      lex->sphead= 0;
      goto error;
unknown's avatar
unknown committed
4010
    default:
4011
      my_error(ER_SP_STORE_FAILED, MYF(0), SP_TYPE_STRING(lex), name);
4012
      lex->unit.cleanup();
unknown's avatar
unknown committed
4013 4014 4015
      delete lex->sphead;
      lex->sphead= 0;
      goto error;
4016
    }
unknown's avatar
unknown committed
4017 4018
    break;
  }
4019 4020 4021 4022
  case SQLCOM_CALL:
    {
      sp_head *sp;

4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036
      /*
        This will cache all SP and SF and open and lock all tables
        required for execution.
      */
      if (check_table_access(thd, SELECT_ACL, all_tables, 0) ||
	  open_and_lock_tables(thd, all_tables))
       goto error;

      /*
        By this moment all needed SPs should be in cache so no need
        to look into DB. Moreover we may be unable to do it becuase
        we may don't have read lock on mysql.proc
      */
      if (!(sp= sp_find_procedure(thd, lex->spname, TRUE)))
4037
      {
4038
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "PROCEDURE",
unknown's avatar
unknown committed
4039
                 lex->spname->m_qname.str);
4040
	goto error;
4041 4042 4043
      }
      else
      {
4044
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4045
	st_sp_security_context save_ctx;
4046
#endif
unknown's avatar
unknown committed
4047
	ha_rows select_limit;
unknown's avatar
unknown committed
4048 4049
        /* bits that should be cleared in thd->server_status */
	uint bits_to_be_cleared= 0;
4050

4051
#ifndef EMBEDDED_LIBRARY
4052 4053
	my_bool nsok= thd->net.no_send_ok;
	thd->net.no_send_ok= TRUE;
4054
#endif
4055
	if (sp->m_multi_results)
4056
	{
4057
	  if (! (thd->client_capabilities & CLIENT_MULTI_RESULTS))
4058
	  {
4059
	    my_error(ER_SP_BADSELECT, MYF(0), sp->m_qname.str);
4060 4061 4062 4063 4064
#ifndef EMBEDDED_LIBRARY
	    thd->net.no_send_ok= nsok;
#endif
	    goto error;
	  }
unknown's avatar
unknown committed
4065 4066 4067 4068 4069 4070 4071
          /*
            If SERVER_MORE_RESULTS_EXISTS is not set,
            then remember that it should be cleared
          */
	  bits_to_be_cleared= (~thd->server_status &
                               SERVER_MORE_RESULTS_EXISTS);
	  thd->server_status|= SERVER_MORE_RESULTS_EXISTS;
4072 4073
	}

4074
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4075 4076 4077 4078 4079 4080 4081 4082
	if (check_procedure_access(thd, EXECUTE_ACL, 
				   sp->m_db.str, sp->m_name.str, 0))
	{
#ifndef EMBEDDED_LIBRARY
	  thd->net.no_send_ok= nsok;
#endif
	  goto error;
	}
4083
	sp_change_security_context(thd, sp, &save_ctx);
4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094
	if (save_ctx.changed && 
	    check_procedure_access(thd, EXECUTE_ACL, 
				   sp->m_db.str, sp->m_name.str, 0))
	{
#ifndef EMBEDDED_LIBRARY
	  thd->net.no_send_ok= nsok;
#endif
	  sp_restore_security_context(thd, sp, &save_ctx);
	  goto error;
	}

4095
#endif
unknown's avatar
unknown committed
4096 4097
	select_limit= thd->variables.select_limit;
	thd->variables.select_limit= HA_POS_ERROR;
4098

4099
	thd->row_count_func= 0;
4100
	res= sp->execute_procedure(thd, &lex->value_list);
4101

4102 4103 4104
	/*
          If warnings have been cleared, we have to clear total_warn_count
          too, otherwise the clients get confused.
4105 4106 4107 4108
	 */
	if (thd->warn_list.is_empty())
	  thd->total_warn_count= 0;

unknown's avatar
unknown committed
4109
	thd->variables.select_limit= select_limit;
4110
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4111
	sp_restore_security_context(thd, sp, &save_ctx);
4112
#endif
4113

4114
#ifndef EMBEDDED_LIBRARY
4115
	thd->net.no_send_ok= nsok;
4116
#endif
unknown's avatar
unknown committed
4117
        thd->server_status&= ~bits_to_be_cleared;
4118

unknown's avatar
unknown committed
4119
	if (!res)
unknown's avatar
unknown committed
4120 4121
	  send_ok(thd, (ulong) (thd->row_count_func < 0 ? 0 :
                                thd->row_count_func));
4122 4123
	else
	  goto error;		// Substatement should already have sent error
4124
      }
4125
      break;
4126 4127
    }
  case SQLCOM_ALTER_PROCEDURE:
4128
  case SQLCOM_ALTER_FUNCTION:
4129
    {
unknown's avatar
unknown committed
4130
      int result;
4131 4132 4133 4134
      sp_head *sp;
      st_sp_chistics chistics;

      memcpy(&chistics, &lex->sp_chistics, sizeof(chistics));
unknown's avatar
unknown committed
4135
      if (lex->sql_command == SQLCOM_ALTER_PROCEDURE)
4136
	sp= sp_find_procedure(thd, lex->spname);
4137
      else
4138
	sp= sp_find_function(thd, lex->spname);
unknown's avatar
unknown committed
4139
      mysql_reset_errors(thd, 0);
4140
      if (! sp)
4141 4142 4143 4144 4145 4146 4147 4148 4149
      {
	if (lex->spname->m_db.str)
	  result= SP_KEY_NOT_FOUND;
	else
	{
	  my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
	  goto error;
	}
      }
4150 4151
      else
      {
4152 4153 4154
        if (check_procedure_access(thd, ALTER_PROC_ACL, sp->m_db.str, 
				  sp->m_name.str, 0))
	  goto error;
4155 4156
	memcpy(&lex->sp_chistics, &chistics, sizeof(lex->sp_chistics));
	if (lex->sql_command == SQLCOM_ALTER_PROCEDURE)
unknown's avatar
merge  
unknown committed
4157
	  result= sp_update_procedure(thd, lex->spname, &lex->sp_chistics);
4158
	else
unknown's avatar
merge  
unknown committed
4159
	  result= sp_update_function(thd, lex->spname, &lex->sp_chistics);
4160
      }
unknown's avatar
unknown committed
4161
      switch (result)
4162
      {
unknown's avatar
unknown committed
4163
      case SP_OK:
4164
	send_ok(thd);
unknown's avatar
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4165 4166
	break;
      case SP_KEY_NOT_FOUND:
4167 4168
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
unknown's avatar
unknown committed
4169 4170
	goto error;
      default:
4171 4172
	my_error(ER_SP_CANT_ALTER, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
unknown's avatar
unknown committed
4173
	goto error;
4174
      }
4175
      break;
4176 4177
    }
  case SQLCOM_DROP_PROCEDURE:
4178
  case SQLCOM_DROP_FUNCTION:
4179
    {
4180
      sp_head *sp;
unknown's avatar
unknown committed
4181
      int result;
4182
      char *db, *name;
4183

4184
      if (lex->sql_command == SQLCOM_DROP_PROCEDURE)
4185 4186 4187
	sp= sp_find_procedure(thd, lex->spname);
      else
	sp= sp_find_function(thd, lex->spname);
unknown's avatar
unknown committed
4188
      mysql_reset_errors(thd, 0);
4189
      if (sp)
4190
      {
4191 4192 4193
        db= thd->strdup(sp->m_db.str);
	name= thd->strdup(sp->m_name.str);
	if (check_procedure_access(thd, ALTER_PROC_ACL, db, name, 0))
unknown's avatar
merge  
unknown committed
4194
          goto error;
unknown's avatar
unknown committed
4195
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4196 4197 4198 4199 4200 4201 4202
	if (sp_automatic_privileges &&
	    sp_revoke_privileges(thd, db, name))
	{
	  push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 
		       ER_PROC_AUTO_REVOKE_FAIL,
		       ER(ER_PROC_AUTO_REVOKE_FAIL));
	}
unknown's avatar
unknown committed
4203
#endif
4204
	if (lex->sql_command == SQLCOM_DROP_PROCEDURE)
unknown's avatar
merge  
unknown committed
4205
	  result= sp_drop_procedure(thd, lex->spname);
4206
	else
unknown's avatar
merge  
unknown committed
4207
	  result= sp_drop_function(thd, lex->spname);
4208 4209 4210
      }
      else
      {
4211
#ifdef HAVE_DLOPEN
4212 4213 4214 4215 4216 4217 4218 4219 4220
	if (lex->sql_command == SQLCOM_DROP_FUNCTION)
	{
          udf_func *udf = find_udf(lex->spname->m_name.str,
                                   lex->spname->m_name.length);
          if (udf)
          {
	    if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 0))
	      goto error;
	    if (!(res = mysql_drop_function(thd, &lex->spname->m_name)))
4221
	    {
4222 4223
	      send_ok(thd);
	      break;
4224 4225
	    }
	  }
4226
	}
4227
#endif
4228 4229 4230 4231 4232 4233 4234
	if (lex->spname->m_db.str)
	  result= SP_KEY_NOT_FOUND;
	else
	{
	  my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
	  goto error;
	}
4235
      }
unknown's avatar
unknown committed
4236 4237
      res= result;
      switch (result)
4238 4239
      {
      case SP_OK:
4240
	send_ok(thd);
4241 4242
	break;
      case SP_KEY_NOT_FOUND:
4243 4244
	if (lex->drop_if_exists)
	{
4245
	  push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
4246
			      ER_SP_DOES_NOT_EXIST, ER(ER_SP_DOES_NOT_EXIST),
4247
			      SP_COM_STRING(lex), lex->spname->m_name.str);
unknown's avatar
unknown committed
4248
	  res= FALSE;
4249 4250 4251
	  send_ok(thd);
	  break;
	}
4252 4253
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4254 4255
	goto error;
      default:
4256 4257
	my_error(ER_SP_DROP_FAILED, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4258
	goto error;
4259
      }
4260
      break;
4261
    }
unknown's avatar
unknown committed
4262 4263
  case SQLCOM_SHOW_CREATE_PROC:
    {
4264
      if (lex->spname->m_name.length > NAME_LEN)
unknown's avatar
unknown committed
4265
      {
4266
	my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str);
unknown's avatar
unknown committed
4267 4268
	goto error;
      }
unknown's avatar
unknown committed
4269
      if (sp_show_create_procedure(thd, lex->spname) != SP_OK)
4270
      {			/* We don't distinguish between errors for now */
4271 4272
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
unknown's avatar
unknown committed
4273 4274 4275 4276 4277 4278
	goto error;
      }
      break;
    }
  case SQLCOM_SHOW_CREATE_FUNC:
    {
4279
      if (lex->spname->m_name.length > NAME_LEN)
unknown's avatar
unknown committed
4280
      {
4281
	my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str);
unknown's avatar
unknown committed
4282 4283
	goto error;
      }
unknown's avatar
unknown committed
4284
      if (sp_show_create_function(thd, lex->spname) != SP_OK)
4285
      {			/* We don't distinguish between errors for now */
4286 4287
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
unknown's avatar
unknown committed
4288 4289 4290 4291 4292 4293
	goto error;
      }
      break;
    }
  case SQLCOM_SHOW_STATUS_PROC:
    {
4294
      res= sp_show_status_procedure(thd, (lex->wild ?
unknown's avatar
unknown committed
4295 4296 4297 4298 4299
					  lex->wild->ptr() : NullS));
      break;
    }
  case SQLCOM_SHOW_STATUS_FUNC:
    {
4300
      res= sp_show_status_function(thd, (lex->wild ? 
unknown's avatar
unknown committed
4301 4302 4303
					 lex->wild->ptr() : NullS));
      break;
    }
unknown's avatar
VIEW  
unknown committed
4304 4305
  case SQLCOM_CREATE_VIEW:
    {
4306 4307 4308
      if (!(res= mysql_create_view(thd, thd->lex->create_view_mode)) &&
          mysql_bin_log.is_open())
      {
unknown's avatar
unknown committed
4309
        thd->clear_error();
4310 4311 4312
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
        mysql_bin_log.write(&qinfo);
      }
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VIEW  
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4313 4314 4315 4316
      break;
    }
  case SQLCOM_DROP_VIEW:
    {
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      if (check_table_access(thd, DROP_ACL, all_tables, 0) ||
          end_active_trans(thd))
        goto error;
4320 4321 4322
      if (!(res= mysql_drop_view(thd, first_table, thd->lex->drop_mode)) &&
          mysql_bin_log.is_open())
      {
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4323
        thd->clear_error();
4324 4325 4326
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
        mysql_bin_log.write(&qinfo);
      }
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VIEW  
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4327 4328
      break;
    }
4329 4330
  case SQLCOM_CREATE_TRIGGER:
  {
4331 4332 4333
    res= mysql_create_or_drop_trigger(thd, all_tables, 1);

    /* We don't care about trigger body after this point */
4334 4335 4336 4337 4338 4339 4340 4341 4342
    delete lex->sphead;
    lex->sphead= 0;
    break;
  }
  case SQLCOM_DROP_TRIGGER:
  {
    res= mysql_create_or_drop_trigger(thd, all_tables, 0);
    break;
  }
4343 4344 4345
  case SQLCOM_XA_START:
    if (thd->transaction.xa_state == XA_IDLE && thd->lex->xa_opt == XA_RESUME)
    {
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4346
      if (! thd->transaction.xid.eq(thd->lex->xid))
4347 4348 4349 4350 4351 4352 4353 4354
      {
        my_error(ER_XAER_NOTA, MYF(0));
        break;
      }
      thd->transaction.xa_state=XA_ACTIVE;
      send_ok(thd);
      break;
    }
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4355
    if (thd->lex->xa_opt != XA_NONE)
4356 4357 4358 4359 4360 4361
    { // JOIN is not supported yet. TODO
      my_error(ER_XAER_INVAL, MYF(0));
      break;
    }
    if (thd->transaction.xa_state != XA_NOTR)
    {
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4362 4363
      my_error(ER_XAER_RMFAIL, MYF(0),
               xa_state_names[thd->transaction.xa_state]);
4364 4365 4366 4367 4368 4369 4370 4371 4372
      break;
    }
    if (thd->active_transaction() || thd->locked_tables)
    {
      my_error(ER_XAER_OUTSIDE, MYF(0));
      break;
    }
    DBUG_ASSERT(thd->transaction.xid.is_null());
    thd->transaction.xa_state=XA_ACTIVE;
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4373
    thd->transaction.xid.set(thd->lex->xid);
4374 4375 4376 4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387
    thd->options= ((thd->options & (ulong) ~(OPTION_STATUS_NO_TRANS_UPDATE)) |
                   OPTION_BEGIN);
    thd->server_status|= SERVER_STATUS_IN_TRANS;
    send_ok(thd);
    break;
  case SQLCOM_XA_END:
    /* fake it */
    if (thd->lex->xa_opt != XA_NONE)
    { // SUSPEND and FOR MIGRATE are not supported yet. TODO
      my_error(ER_XAER_INVAL, MYF(0));
      break;
    }
    if (thd->transaction.xa_state != XA_ACTIVE)
    {
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      my_error(ER_XAER_RMFAIL, MYF(0),
               xa_state_names[thd->transaction.xa_state]);
4390 4391
      break;
    }
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4392
    if (!thd->transaction.xid.eq(thd->lex->xid))
4393 4394 4395 4396 4397 4398 4399 4400 4401 4402
    {
      my_error(ER_XAER_NOTA, MYF(0));
      break;
    }
    thd->transaction.xa_state=XA_IDLE;
    send_ok(thd);
    break;
  case SQLCOM_XA_PREPARE:
    if (thd->transaction.xa_state != XA_IDLE)
    {
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      my_error(ER_XAER_RMFAIL, MYF(0),
               xa_state_names[thd->transaction.xa_state]);
4405 4406
      break;
    }
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    if (!thd->transaction.xid.eq(thd->lex->xid))
4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421
    {
      my_error(ER_XAER_NOTA, MYF(0));
      break;
    }
    if (ha_prepare(thd))
    {
      my_error(ER_XA_RBROLLBACK, MYF(0));
      thd->transaction.xa_state=XA_NOTR;
      break;
    }
    thd->transaction.xa_state=XA_PREPARED;
    send_ok(thd);
    break;
  case SQLCOM_XA_COMMIT:
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4422
    if (!thd->transaction.xid.eq(thd->lex->xid))
4423
    {
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4424
      if (!(res= !ha_commit_or_rollback_by_xid(thd->lex->xid, 1)))
4425
        my_error(ER_XAER_NOTA, MYF(0));
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4426 4427
      else
        send_ok(thd);
4428 4429 4430 4431
      break;
    }
    if (thd->transaction.xa_state == XA_IDLE && thd->lex->xa_opt == XA_ONE_PHASE)
    {
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4432 4433 4434
      int r;
      if ((r= ha_commit(thd)))
        my_error(r == 1 ? ER_XA_RBROLLBACK : ER_XAER_RMERR, MYF(0));
4435 4436 4437 4438 4439 4440
      else
        send_ok(thd);
    }
    else
    if (thd->transaction.xa_state == XA_PREPARED && thd->lex->xa_opt == XA_NONE)
    {
4441 4442 4443
      if (wait_if_global_read_lock(thd, 0, 0))
      {
        ha_rollback(thd);
4444
        my_error(ER_XAER_RMERR, MYF(0));
4445
      }
4446
      else
4447 4448 4449 4450 4451 4452 4453
      {
        if (ha_commit_one_phase(thd, 1))
          my_error(ER_XAER_RMERR, MYF(0));
        else
          send_ok(thd);
        start_waiting_global_read_lock(thd);
      }
4454 4455 4456
    }
    else
    {
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4457 4458
      my_error(ER_XAER_RMFAIL, MYF(0),
               xa_state_names[thd->transaction.xa_state]);
4459 4460 4461 4462 4463 4464 4465
      break;
    }
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    thd->transaction.xa_state=XA_NOTR;
    break;
  case SQLCOM_XA_ROLLBACK:
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4466
    if (!thd->transaction.xid.eq(thd->lex->xid))
4467
    {
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4468
      if (!(res= !ha_commit_or_rollback_by_xid(thd->lex->xid, 0)))
4469
        my_error(ER_XAER_NOTA, MYF(0));
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4470 4471
      else
        send_ok(thd);
4472 4473 4474 4475 4476
      break;
    }
    if (thd->transaction.xa_state != XA_IDLE &&
        thd->transaction.xa_state != XA_PREPARED)
    {
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4477 4478
      my_error(ER_XAER_RMFAIL, MYF(0),
               xa_state_names[thd->transaction.xa_state]);
4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489
      break;
    }
    if (ha_rollback(thd))
      my_error(ER_XAER_RMERR, MYF(0));
    else
      send_ok(thd);
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    thd->transaction.xa_state=XA_NOTR;
    break;
  case SQLCOM_XA_RECOVER:
4490
    res= mysql_xa_recover(thd);
4491 4492 4493
    break;
  default:
    DBUG_ASSERT(0);                             /* Impossible */
4494
    send_ok(thd);
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4495 4496
    break;
  }
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4497
  thd->proc_info="query end";
4498
  if (thd->one_shot_set)
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4499 4500 4501 4502 4503 4504 4505 4506
  {
    /*
      If this is a SET, do nothing. This is to allow mysqlbinlog to print
      many SET commands (in this case we want the charset temp setting to
      live until the real query). This is also needed so that SET
      CHARACTER_SET_CLIENT... does not cancel itself immediately.
    */
    if (lex->sql_command != SQLCOM_SET_OPTION)
4507
    {
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4508 4509 4510 4511 4512 4513 4514 4515 4516 4517 4518 4519
      thd->variables.character_set_client=
        global_system_variables.character_set_client;
      thd->variables.collation_connection=
        global_system_variables.collation_connection;
      thd->variables.collation_database=
        global_system_variables.collation_database;
      thd->variables.collation_server=
        global_system_variables.collation_server;
      thd->update_charset();
      thd->variables.time_zone=
        global_system_variables.time_zone;
      thd->one_shot_set= 0;
4520
    }
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4521
  }
4522

4523 4524 4525 4526 4527
  /*
    The return value for ROW_COUNT() is "implementation dependent" if
    the statement is not DELETE, INSERT or UPDATE (or a CALL executing
    such a statement), but -1 is what JDBC and ODBC wants.
   */
4528
  if (lex->sql_command != SQLCOM_CALL && uc_update_queries[lex->sql_command]<2)
4529
    thd->row_count_func= -1;
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4530
  goto cleanup;
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4531 4532

error:
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4533
  res= 1;
4534

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4535
cleanup:
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  if (unlikely(slave_fake_lock))
  {
    DBUG_PRINT("info",("undoing faked lock"));
    thd->lock= thd->locked_tables;
    thd->locked_tables= fake_prev_lock;
    if (thd->lock == thd->locked_tables)
      thd->lock= 0;
  }
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  DBUG_RETURN(res || thd->net.report_error);
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4545 4546 4547
}


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/*
  Check grants for commands which work only with one table and all other
4550
  tables belonging to subselects or implicitly opened tables.
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4551

4552
  SYNOPSIS
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4553 4554
    check_one_table_access()
    thd			Thread handler
4555
    privilege		requested privilege
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VIEW  
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4556
    all_tables		global table list of query
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  RETURN
    0 - OK
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    1 - access denied, error is sent to client
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*/

4563
bool check_one_table_access(THD *thd, ulong privilege, TABLE_LIST *all_tables)
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4564
{
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VIEW  
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4565 4566
  if (check_access(thd, privilege, all_tables->db,
		   &all_tables->grant.privilege, 0, 0))
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4567
    return 1;
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4568

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4569
  /* Show only 1 table for check_grant */
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VIEW  
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4570
  if (grant_option && check_grant(thd, privilege, all_tables, 0, 1, 0))
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4571
    return 1;
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4572

4573
  /* Check rights on tables of subselects and implictly opened tables */
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4574
  TABLE_LIST *subselects_tables;
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VIEW  
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4575
  if ((subselects_tables= all_tables->next_global))
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4576
  {
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VIEW  
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4577
    if ((check_table_access(thd, SELECT_ACL, subselects_tables, 0)))
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4578 4579 4580
      return 1;
  }
  return 0;
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4581 4582 4583
}


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4584
/****************************************************************************
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4585
  Get the user (global) and database privileges for all used tables
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4586 4587 4588 4589 4590 4591 4592 4593 4594 4595 4596 4597 4598

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

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

    save_priv	In this we store global and db level grants for the table
		Note that we don't store db level grants if the global grants
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4599 4600
                is enough to satisfy the request and the global grants contains
                a SELECT grant.
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4601 4602 4603
****************************************************************************/

bool
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4604
check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
4605
	     bool dont_check_global_grants, bool no_errors)
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4606
{
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4607 4608
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  ulong db_access;
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4609
  bool  db_is_pattern= test(want_access & GRANT_ACL);
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4610 4611
#endif
  ulong dummy;
4612 4613 4614
  DBUG_ENTER("check_access");
  DBUG_PRINT("enter",("db: %s  want_access: %lu  master_access: %lu",
                      db ? db : "", want_access, thd->master_access));
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4615 4616 4617 4618 4619
  if (save_priv)
    *save_priv=0;
  else
    save_priv= &dummy;

4620
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
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4621
  {
4622
    DBUG_PRINT("error",("No database"));
4623
    if (!no_errors)
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4624 4625
      my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR),
                 MYF(0));                       /* purecov: tested */
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4626
    DBUG_RETURN(TRUE);				/* purecov: tested */
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4627 4628
  }

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4629 4630 4631
#ifdef NO_EMBEDDED_ACCESS_CHECKS
  DBUG_RETURN(0);
#else
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4632 4633
  if ((thd->master_access & want_access) == want_access)
  {
4634 4635 4636 4637 4638 4639 4640
    /*
      If we don't have a global SELECT privilege, we have to get the database
      specific access rights to be able to handle queries of type
      UPDATE t1 SET a=1 WHERE b > 0
    */
    db_access= thd->db_access;
    if (!(thd->master_access & SELECT_ACL) &&
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4641
	(db && (!thd->db || db_is_pattern || strcmp(db,thd->db))))
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4642
      db_access=acl_get(thd->host, thd->ip, thd->priv_user, db, db_is_pattern);
4643
    *save_priv=thd->master_access | db_access;
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4644
    DBUG_RETURN(FALSE);
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4645
  }
4646
  if (((want_access & ~thd->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
4647
      ! db && dont_check_global_grants)
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4648
  {						// We can never grant this
4649
    DBUG_PRINT("error",("No possible access"));
4650
    if (!no_errors)
4651 4652 4653 4654 4655 4656
      my_error(ER_ACCESS_DENIED_ERROR, MYF(0),
               thd->priv_user,
               thd->priv_host,
               (thd->password ?
                ER(ER_YES) :
                ER(ER_NO)));                    /* purecov: tested */
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4657
    DBUG_RETURN(TRUE);				/* purecov: tested */
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4658 4659 4660
  }

  if (db == any_db)
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4661
    DBUG_RETURN(FALSE);				// Allow select on anything
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4662

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4663
  if (db && (!thd->db || db_is_pattern || strcmp(db,thd->db)))
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4664
    db_access=acl_get(thd->host, thd->ip, thd->priv_user, db, db_is_pattern);
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4665 4666
  else
    db_access=thd->db_access;
4667
  DBUG_PRINT("info",("db_access: %lu", db_access));
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4668
  /* Remove SHOW attribute and access rights we already have */
4669
  want_access &= ~(thd->master_access | EXTRA_ACL);
4670 4671
  DBUG_PRINT("info",("db_access: %lu  want_access: %lu",
                     db_access, want_access));
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4672
  db_access= ((*save_priv=(db_access | thd->master_access)) & want_access);
4673 4674

  /* grant_option is set if there exists a single table or column grant */
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4675
  if (db_access == want_access ||
4676
      (grant_option && !dont_check_global_grants &&
4677
       !(want_access & ~(db_access | TABLE_ACLS | PROC_ACLS))))
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4678
    DBUG_RETURN(FALSE);				/* Ok */
4679 4680

  DBUG_PRINT("error",("Access denied"));
4681
  if (!no_errors)
4682 4683 4684 4685 4686 4687
    my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
             thd->priv_user,
             thd->priv_host,
             (db ? db : (thd->db ?
                         thd->db :
                         "unknown")));          /* purecov: tested */
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4688
  DBUG_RETURN(TRUE);				/* purecov: tested */
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4689
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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4690 4691 4692
}


4693 4694 4695 4696 4697 4698 4699 4700 4701
/*
  check for global access and give descriptive error message if it fails

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

  WARNING
4702
    One gets access right if one has ANY of the rights in want_access
4703 4704 4705 4706 4707 4708 4709 4710
    This is useful as one in most cases only need one global right,
    but in some case we want to check if the user has SUPER or
    REPL_CLIENT_ACL rights.

  RETURN
    0	ok
    1	Access denied.  In this case an error is sent to the client
*/
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4711 4712

bool check_global_access(THD *thd, ulong want_access)
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4713
{
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4714 4715 4716
#ifdef NO_EMBEDDED_ACCESS_CHECKS
  return 0;
#else
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4717
  char command[128];
4718
  if ((thd->master_access & want_access))
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4719 4720
    return 0;
  get_privilege_desc(command, sizeof(command), want_access);
4721
  my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), command);
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4722
  return 1;
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4723
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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}


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/*
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4728 4729
  Check the privilege for all used tables.  Table privileges are cached
  in the table list for GRANT checking
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*/

4732
bool
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4733
check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
4734
		   bool no_errors)
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4735
{
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4736 4737
  uint found=0;
  ulong found_access=0;
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4738
  TABLE_LIST *org_tables=tables;
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VIEW  
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4739
  for (; tables; tables= tables->next_global)
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4740
  {
4741
    if (tables->derived || tables->schema_table || tables->belong_to_view ||
4742
        (tables->table && (int)tables->table->s->tmp_table) ||
4743 4744
        my_tz_check_n_skip_implicit_tables(&tables,
                                           thd->lex->time_zone_tables_used))
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      continue;
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4746 4747
    if ((thd->master_access & want_access) == (want_access & ~EXTRA_ACL) &&
	thd->db)
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      tables->grant.privilege= want_access;
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    else if (tables->db && tables->db == thd->db)
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4750 4751 4752 4753 4754
    {
      if (found && !grant_option)		// db already checked
	tables->grant.privilege=found_access;
      else
      {
4755 4756
	if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
			 0, no_errors))
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4757 4758
	  return TRUE;				// Access denied
	found_access=tables->grant.privilege;
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	found=1;
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4760 4761
      }
    }
4762
    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
4763
			  0, no_errors))
4764
      return TRUE;
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4765 4766
  }
  if (grant_option)
4767
    return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
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		       test(want_access & EXTRA_ACL), UINT_MAX, no_errors);
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  return FALSE;
}

4772

4773 4774 4775 4776 4777 4778 4779 4780
bool
check_procedure_access(THD *thd, ulong want_access,char *db, char *name,
		       bool no_errors)
{
  TABLE_LIST tables[1];
  
  bzero((char *)tables, sizeof(TABLE_LIST));
  tables->db= db;
4781
  tables->table_name= tables->alias= name;
4782 4783 4784 4785 4786 4787 4788
  
  if ((thd->master_access & want_access) == want_access && !thd->db)
    tables->grant.privilege= want_access;
  else if (check_access(thd,want_access,db,&tables->grant.privilege,
			0, no_errors))
    return TRUE;
  
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4789
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4790 4791
  if (grant_option)
    return check_grant_procedure(thd, want_access, tables, no_errors);
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4792
#endif
4793 4794 4795 4796

  return FALSE;
}

4797 4798 4799 4800 4801 4802 4803 4804 4805 4806 4807 4808 4809 4810 4811

/*
  Check if the routine has any of the routine privileges

  SYNOPSIS
    check_some_routine_access()
    thd		 Thread handler
    db           Database name
    name         Routine name

  RETURN
    0            ok
    1            error
*/

4812
bool check_some_routine_access(THD *thd, const char *db, const char *name)
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{
  ulong save_priv;
  if (thd->master_access & SHOW_PROC_ACLS)
    return FALSE;
  if (!check_access(thd, SHOW_PROC_ACLS, db, &save_priv, 0, 1) ||
      (save_priv & SHOW_PROC_ACLS))
    return FALSE;
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  return check_routine_level_acl(thd, db, name);
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}


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/*
  Check if the given table has any of the asked privileges

  SYNOPSIS
    check_some_access()
    thd		 Thread handler
    want_access	 Bitmap of possible privileges to check for

  RETURN
    0  ok
    1  error
*/


bool check_some_access(THD *thd, ulong want_access, TABLE_LIST *table)
{
  ulong access;
  DBUG_ENTER("check_some_access");

  /* This loop will work as long as we have less than 32 privileges */
  for (access= 1; access < want_access ; access<<= 1)
  {
    if (access & want_access)
    {
      if (!check_access(thd, access, table->db,
                        &table->grant.privilege, 0, 1) &&
          !grant_option || !check_grant(thd, access, table, 0, 1, 1))
        DBUG_RETURN(0);
    }
  }
  DBUG_PRINT("exit",("no matching access rights"));
  DBUG_RETURN(1);
}


4859 4860
bool check_merge_table_access(THD *thd, char *db,
			      TABLE_LIST *table_list)
4861 4862 4863 4864
{
  int error=0;
  if (table_list)
  {
4865
    /* Check that all tables use the current database */
4866
    TABLE_LIST *tmp;
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    for (tmp= table_list; tmp; tmp= tmp->next_local)
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    {
      if (!tmp->db || !tmp->db[0])
	tmp->db=db;
    }
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    error=check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
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			     table_list,0);
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  }
  return error;
}

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static bool check_db_used(THD *thd,TABLE_LIST *tables)
{
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  for (; tables; tables= tables->next_global)
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  {
    if (!tables->db)
    {
      if (!(tables->db=thd->db))
      {
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	my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR),
                   MYF(0));                     /* purecov: tested */
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	return TRUE;				/* purecov: tested */
      }
    }
  }
  return FALSE;
}
4895

4896

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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

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#ifndef DBUG_OFF
long max_stack_used;
#endif

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

4933
bool my_yyoverflow(short **yyss, YYSTYPE **yyvs, ulong *yystacksize)
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{
  LEX	*lex=current_lex;
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  ulong old_info=0;
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  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;
}


/****************************************************************************
4963
  Initialize global thd variables needed for query
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****************************************************************************/

4966
void
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mysql_init_query(THD *thd, uchar *buf, uint length)
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{
  DBUG_ENTER("mysql_init_query");
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  lex_start(thd, buf, length);
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  mysql_reset_thd_for_next_command(thd);
  DBUG_VOID_RETURN;
}


/*
 Reset THD part responsible for command processing state.

 DESCRIPTION
   This needs to be called before execution of every statement
   (prepared or conventional).

 TODO
   Make it a method of THD and align its name with the rest of
   reset/end/start/init methods.
   Call it after we use THD for queries, not before.
*/

void mysql_reset_thd_for_next_command(THD *thd)
{
  DBUG_ENTER("mysql_reset_thd_for_next_command");
4992
  thd->free_list= 0;
4993
  thd->select_number= 1;
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  thd->total_warn_count=0;			// Warnings for this query
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  thd->last_insert_id_used= thd->query_start_used= thd->insert_id_used=0;
  thd->sent_row_count= thd->examined_row_count= 0;
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  thd->is_fatal_error= thd->rand_used= thd->time_zone_used= 0;
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  thd->server_status&= ~ (SERVER_MORE_RESULTS_EXISTS | 
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                          SERVER_QUERY_NO_INDEX_USED |
                          SERVER_QUERY_NO_GOOD_INDEX_USED);
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  thd->tmp_table_used= 0;
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  if (opt_bin_log)
    reset_dynamic(&thd->user_var_events);
5004
  thd->clear_error();
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  DBUG_VOID_RETURN;
}

5008

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void
mysql_init_select(LEX *lex)
{
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  SELECT_LEX *select_lex= lex->current_select;
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  select_lex->init_select();
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  select_lex->select_limit= HA_POS_ERROR;
5015 5016
  lex->orig_sql_command= SQLCOM_END;
  lex->wild= 0;
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  if (select_lex == &lex->select_lex)
  {
5019
    DBUG_ASSERT(lex->result == 0);
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    lex->exchange= 0;
  }
5022 5023
}

5024

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bool
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mysql_new_select(LEX *lex, bool move_down)
5027
{
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  SELECT_LEX *select_lex;
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  DBUG_ENTER("mysql_new_select");

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  if (!(select_lex= new(lex->thd->mem_root) SELECT_LEX()))
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    DBUG_RETURN(1);
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  select_lex->select_number= ++lex->thd->select_number;
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  select_lex->init_query();
  select_lex->init_select();
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  select_lex->parent_lex= lex;
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  if (move_down)
  {
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    SELECT_LEX_UNIT *unit;
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    lex->subqueries= TRUE;
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    /* first select_lex of subselect or derived table */
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    if (!(unit= new(lex->thd->mem_root) SELECT_LEX_UNIT()))
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      DBUG_RETURN(1);
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    unit->init_query();
    unit->init_select();
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    unit->thd= lex->thd;
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    unit->include_down(lex->current_select);
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    unit->link_next= 0;
    unit->link_prev= 0;
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    unit->return_to= lex->current_select;
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    select_lex->include_down(unit);
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    /* TODO: assign resolve_mode for fake subquery after merging with new tree */
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  }
  else
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  {
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    if (lex->current_select->order_list.first && !lex->current_select->braces)
    {
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      my_error(ER_WRONG_USAGE, MYF(0), "UNION", "ORDER BY");
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      DBUG_RETURN(1);
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    }
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    select_lex->include_neighbour(lex->current_select);
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    SELECT_LEX_UNIT *unit= select_lex->master_unit();
    SELECT_LEX *fake= unit->fake_select_lex;
    if (!fake)
    {
      /*
	as far as we included SELECT_LEX for UNION unit should have
	fake SELECT_LEX for UNION processing
      */
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      if (!(fake= unit->fake_select_lex= new(lex->thd->mem_root) SELECT_LEX()))
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        DBUG_RETURN(1);
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      fake->include_standalone(unit,
			       (SELECT_LEX_NODE**)&unit->fake_select_lex);
      fake->select_number= INT_MAX;
      fake->make_empty_select();
      fake->linkage= GLOBAL_OPTIONS_TYPE;
5078
      fake->select_limit= HA_POS_ERROR;
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    }
  }
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  select_lex->master_unit()->global_parameters= select_lex;
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  select_lex->include_global((st_select_lex_node**)&lex->all_selects_list);
5084
  lex->current_select= select_lex;
5085
  select_lex->resolve_mode= SELECT_LEX::SELECT_MODE;
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  DBUG_RETURN(0);
5087
}
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/*
  Create a select to return the same output as 'SELECT @@var_name'.

  SYNOPSIS
    create_select_for_variable()
    var_name		Variable name

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

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

void create_select_for_variable(const char *var_name)
{
5104
  THD *thd;
5105
  LEX *lex;
5106
  LEX_STRING tmp, null_lex_string;
5107
  DBUG_ENTER("create_select_for_variable");
5108 5109

  thd= current_thd;
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  lex= thd->lex;
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  mysql_init_select(lex);
  lex->sql_command= SQLCOM_SELECT;
  tmp.str= (char*) var_name;
  tmp.length=strlen(var_name);
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  bzero((char*) &null_lex_string.str, sizeof(null_lex_string));
  add_item_to_list(thd, get_system_var(thd, OPT_SESSION, tmp,
				       null_lex_string));
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  DBUG_VOID_RETURN;
}

5121

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void mysql_init_multi_delete(LEX *lex)
{
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  lex->sql_command=  SQLCOM_DELETE_MULTI;
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  mysql_init_select(lex);
5126
  lex->select_lex.select_limit= lex->unit.select_limit_cnt=
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    HA_POS_ERROR;
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  lex->select_lex.table_list.save_and_clear(&lex->auxilliary_table_list);
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  lex->query_tables= 0;
  lex->query_tables_last= &lex->query_tables;
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}
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5133

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/*
  When you modify mysql_parse(), you may need to mofify
  mysql_test_parse_for_slave() in this same file.
*/
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5139
void mysql_parse(THD *thd, char *inBuf, uint length)
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{
  DBUG_ENTER("mysql_parse");

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  mysql_init_query(thd, (uchar*) inBuf, length);
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  if (query_cache_send_result_to_client(thd, inBuf, length) <= 0)
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  {
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    LEX *lex= thd->lex;
5147
    if (!yyparse((void *)thd) && ! thd->is_fatal_error)
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    {
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
5150
      if (mqh_used && thd->user_connect &&
5151
	  check_mqh(thd, lex->sql_command))
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      {
	thd->net.error = 0;
      }
      else
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#endif
5157
      {
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	if (thd->net.report_error)
5159 5160
	{
	  if (thd->lex->sphead)
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	  {
	    delete thd->lex->sphead;
	    thd->lex->sphead= NULL;
	  }
5165
	}
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	else
	{
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          /*
            Binlog logs a string starting from thd->query and having length
            thd->query_length; so we set thd->query_length correctly (to not
            log several statements in one event, when we executed only first).
            We set it to not see the ';' (otherwise it would get into binlog
            and Query_log_event::print() would give ';;' output).
            This also helps display only the current query in SHOW
            PROCESSLIST.
            Note that we don't need LOCK_thread_count to modify query_length.
          */
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          if (lex->found_semicolon &&
              (thd->query_length= (ulong)(lex->found_semicolon - thd->query)))
5180 5181
            thd->query_length--;
          /* Actually execute the query */
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	  mysql_execute_command(thd);
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	  query_cache_end_of_result(thd);
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	}
5185
      }
5186
      lex->unit.cleanup();
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    }
    else
5189 5190
    {
      DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
5191
			 thd->is_fatal_error));
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      query_cache_abort(&thd->net);
5193
      lex->unit.cleanup();
5194
      if (thd->lex->sphead)
5195
      {
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	/* Clean up after failed stored procedure/function */
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	delete thd->lex->sphead;
	thd->lex->sphead= NULL;
      }
5200
    }
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    thd->proc_info="freeing items";
5202
    thd->end_statement();
5203
    thd->cleanup_after_query();
5204
    DBUG_ASSERT(thd->change_list.is_empty());
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  }
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  DBUG_VOID_RETURN;
}


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#ifdef HAVE_REPLICATION
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/*
  Usable by the replication SQL thread only: just parse a query to know if it
  can be ignored because of replicate-*-table rules.

  RETURN VALUES
    0	cannot be ignored
    1	can be ignored
*/

bool mysql_test_parse_for_slave(THD *thd, char *inBuf, uint length)
{
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  LEX *lex= thd->lex;
5223
  bool error= 0;
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  DBUG_ENTER("mysql_test_parse_for_slave");
5225

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  mysql_init_query(thd, (uchar*) inBuf, length);
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  if (!yyparse((void*) thd) && ! thd->is_fatal_error &&
5228
      all_tables_not_ok(thd,(TABLE_LIST*) lex->select_lex.table_list.first))
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    error= 1;                  /* Ignore question */
5230
  thd->end_statement();
5231
  thd->cleanup_after_query();
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  DBUG_RETURN(error);
5233
}
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#endif
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5236

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

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bool add_field_to_list(THD *thd, char *field_name, enum_field_types type,
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		       char *length, char *decimals,
5245
		       uint type_modifier,
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		       Item *default_value, Item *on_update_value,
                       LEX_STRING *comment,
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		       char *change,
                       List<String> *interval_list, CHARSET_INFO *cs,
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		       uint uint_geom_type)
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{
  register create_field *new_field;
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  LEX  *lex= thd->lex;
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  DBUG_ENTER("add_field_to_list");

  if (strlen(field_name) > NAME_LEN)
  {
5258
    my_error(ER_TOO_LONG_IDENT, MYF(0), field_name); /* purecov: inspected */
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    DBUG_RETURN(1);				/* purecov: inspected */
  }
  if (type_modifier & PRI_KEY_FLAG)
  {
    lex->col_list.push_back(new key_part_spec(field_name,0));
5264
    lex->key_list.push_back(new Key(Key::PRIMARY, NullS, HA_KEY_ALG_UNDEF,
5265
				    0, lex->col_list));
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    lex->col_list.empty();
  }
  if (type_modifier & (UNIQUE_FLAG | UNIQUE_KEY_FLAG))
  {
    lex->col_list.push_back(new key_part_spec(field_name,0));
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    lex->key_list.push_back(new Key(Key::UNIQUE, NullS, HA_KEY_ALG_UNDEF, 0,
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				    lex->col_list));
    lex->col_list.empty();
  }

5276
  if (default_value)
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  {
5278
    /* 
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      Default value should be literal => basic constants =>
      no need fix_fields()
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      We allow only one function as part of default value - 
      NOW() as default for TIMESTAMP type.
5284
    */
5285 5286 5287
    if (default_value->type() == Item::FUNC_ITEM && 
        !(((Item_func*)default_value)->functype() == Item_func::NOW_FUNC &&
         type == FIELD_TYPE_TIMESTAMP))
5288
    {
5289
      my_error(ER_INVALID_DEFAULT, MYF(0), field_name);
5290 5291 5292
      DBUG_RETURN(1);
    }
    else if (default_value->type() == Item::NULL_ITEM)
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    {
5294
      default_value= 0;
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      if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) ==
	  NOT_NULL_FLAG)
      {
5298
	my_error(ER_INVALID_DEFAULT, MYF(0), field_name);
5299 5300 5301 5302 5303
	DBUG_RETURN(1);
      }
    }
    else if (type_modifier & AUTO_INCREMENT_FLAG)
    {
5304
      my_error(ER_INVALID_DEFAULT, MYF(0), field_name);
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      DBUG_RETURN(1);
    }
  }
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  if (on_update_value && type != FIELD_TYPE_TIMESTAMP)
  {
5311
    my_error(ER_INVALID_ON_UPDATE, MYF(0), field_name);
5312 5313
    DBUG_RETURN(1);
  }
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  if (!(new_field= new_create_field(thd, field_name, type, length, decimals,
		type_modifier, default_value, on_update_value,
		comment, change, interval_list, cs, uint_geom_type)))
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    DBUG_RETURN(1);
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  lex->create_list.push_back(new_field);
  lex->last_field=new_field;
  DBUG_RETURN(0);
}

/*****************************************************************************
** Create field definition for create
** Return 0 on failure, otherwise return create_field instance
******************************************************************************/
  
create_field *
new_create_field(THD *thd, char *field_name, enum_field_types type,
		 char *length, char *decimals,
		 uint type_modifier, 
		 Item *default_value, Item *on_update_value,
		 LEX_STRING *comment,
		 char *change, List<String> *interval_list, CHARSET_INFO *cs,
		 uint uint_geom_type)
{
  register create_field *new_field;
  uint sign_len, allowed_type_modifier=0;
  ulong max_field_charlength= MAX_FIELD_CHARLENGTH;
  DBUG_ENTER("new_create_field");
  
  if (!(new_field=new create_field()))
    DBUG_RETURN(NULL);
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  new_field->field=0;
  new_field->field_name=field_name;
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  new_field->def= default_value;
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  new_field->flags= type_modifier;
  new_field->unireg_check= (type_modifier & AUTO_INCREMENT_FLAG ?
			    Field::NEXT_NUMBER : Field::NONE);
  new_field->decimals= decimals ? (uint) set_zone(atoi(decimals),0,
						  NOT_FIXED_DEC-1) : 0;
  new_field->sql_type=type;
  new_field->length=0;
  new_field->change=change;
  new_field->interval=0;
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  new_field->pack_length= new_field->key_length= 0;
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  new_field->charset=cs;
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  new_field->geom_type= (Field::geometry_type) uint_geom_type;
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  new_field->comment=*comment;
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  /*
    Set flag if this field doesn't have a default value
    Enum values has always the first value as a default (set in
    make_empty_rec().
  */
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  if (!default_value && !(type_modifier & AUTO_INCREMENT_FLAG) &&
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      (type_modifier & NOT_NULL_FLAG) && type != FIELD_TYPE_TIMESTAMP &&
      type != FIELD_TYPE_ENUM)
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    new_field->flags|= NO_DEFAULT_VALUE_FLAG;

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  if (length && !(new_field->length= (uint) atoi(length)))
    length=0; /* purecov: inspected */
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  sign_len=type_modifier & UNSIGNED_FLAG ? 0 : 1;
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  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:
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    if (!length) new_field->length=MAX_TINYINT_WIDTH+sign_len;
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    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_SHORT:
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    if (!length) new_field->length=MAX_SMALLINT_WIDTH+sign_len;
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    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_INT24:
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    if (!length) new_field->length=MAX_MEDIUMINT_WIDTH+sign_len;
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    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_LONG:
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    if (!length) new_field->length=MAX_INT_WIDTH+sign_len;
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    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_LONGLONG:
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    if (!length) new_field->length=MAX_BIGINT_WIDTH;
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    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_NULL:
    break;
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  case FIELD_TYPE_NEWDECIMAL:
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    if (!length)
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    {
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      if (!(new_field->length= new_field->decimals))
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        new_field->length= 10;                  // Default length for DECIMAL
    }
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    new_field->pack_length=
      my_decimal_get_binary_size(new_field->length, new_field->decimals);
    if (new_field->length <= DECIMAL_MAX_LENGTH &&
        new_field->length >= new_field->decimals)
      break;
    my_error(ER_WRONG_FIELD_SPEC, MYF(0), field_name);
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    DBUG_RETURN(NULL);
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  case MYSQL_TYPE_VARCHAR:
    /*
      Long VARCHAR's are automaticly converted to blobs in mysql_prepare_table
      if they don't have a default value
    */
    max_field_charlength= MAX_FIELD_VARCHARLENGTH;
    break;
  case MYSQL_TYPE_STRING:
    break;
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  case FIELD_TYPE_BLOB:
  case FIELD_TYPE_TINY_BLOB:
  case FIELD_TYPE_LONG_BLOB:
  case FIELD_TYPE_MEDIUM_BLOB:
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  case FIELD_TYPE_GEOMETRY:
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    if (default_value)				// Allow empty as default value
    {
      String str,*res;
      res=default_value->val_str(&str);
      if (res->length())
      {
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	my_error(ER_BLOB_CANT_HAVE_DEFAULT, MYF(0),
                 field_name); /* purecov: inspected */
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	DBUG_RETURN(NULL);
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      }
      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)
      {
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	my_error(ER_WRONG_FIELD_SPEC, MYF(0), field_name);
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	DBUG_RETURN(NULL);
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      }
      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
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    else if (new_field->length != 19)
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    {
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      /*
        We support only even TIMESTAMP lengths less or equal than 14
        and 19 as length of 4.1 compatible representation.
      */
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      new_field->length=((new_field->length+1)/2)*2; /* purecov: inspected */
      new_field->length= min(new_field->length,14); /* purecov: inspected */
    }
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    new_field->flags|= ZEROFILL_FLAG | UNSIGNED_FLAG;
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    if (default_value)
    {
      /* Grammar allows only NOW() value for ON UPDATE clause */
      if (default_value->type() == Item::FUNC_ITEM && 
          ((Item_func*)default_value)->functype() == Item_func::NOW_FUNC)
      {
        new_field->unireg_check= (on_update_value?Field::TIMESTAMP_DNUN_FIELD:
                                                  Field::TIMESTAMP_DN_FIELD);
        /*
          We don't need default value any longer moreover it is dangerous.
          Everything handled by unireg_check further.
        */
        new_field->def= 0;
      }
      else
        new_field->unireg_check= (on_update_value?Field::TIMESTAMP_UN_FIELD:
                                                  Field::NONE);
    }
    else
    {
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      /*
        If we have default TIMESTAMP NOT NULL column without explicit DEFAULT
        or ON UPDATE values then for the sake of compatiblity we should treat
        this column as having DEFAULT NOW() ON UPDATE NOW() (when we don't
        have another TIMESTAMP column with auto-set option before this one)
        or DEFAULT 0 (in other cases).
        So here we are setting TIMESTAMP_OLD_FIELD only temporary, and will
        replace this value by TIMESTAMP_DNUN_FIELD or NONE later when
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        information about all TIMESTAMP fields in table will be availiable.
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        If we have TIMESTAMP NULL column without explicit DEFAULT value
        we treat it as having DEFAULT NULL attribute.
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      */
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      new_field->unireg_check= (on_update_value ?
                                Field::TIMESTAMP_UN_FIELD :
                                (new_field->flags & NOT_NULL_FLAG ?
                                 Field::TIMESTAMP_OLD_FIELD:
                                 Field::NONE));
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    }
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    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:
    {
5554
      if (interval_list->elements > sizeof(longlong)*8)
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      {
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	my_error(ER_TOO_BIG_SET, MYF(0), field_name); /* purecov: inspected */
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	DBUG_RETURN(NULL);
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      }
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      new_field->pack_length= get_set_pack_length(interval_list->elements);
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      List_iterator<String> it(*interval_list);
      String *tmp;
      while ((tmp= it++))
        new_field->interval_list.push_back(tmp);
      /*
        Set fake length to 1 to pass the below conditions.
        Real length will be set in mysql_prepare_table()
        when we know the character set of the column
      */
      new_field->length= 1;
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      break;
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    }
  case FIELD_TYPE_ENUM:
    {
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      // Should be safe
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      new_field->pack_length= get_enum_pack_length(interval_list->elements);
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      List_iterator<String> it(*interval_list);
      String *tmp;
      while ((tmp= it++))
        new_field->interval_list.push_back(tmp);
      new_field->length= 1; // See comment for FIELD_TYPE_SET above.
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      break;
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   }
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  case MYSQL_TYPE_VAR_STRING:
    DBUG_ASSERT(0);                             // Impossible
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    break;
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  case MYSQL_TYPE_BIT:
    {
      if (!length)
        new_field->length= 1;
      if (new_field->length > MAX_BIT_FIELD_LENGTH)
      {
        my_error(ER_TOO_BIG_FIELDLENGTH, MYF(0), field_name,
                 MAX_BIT_FIELD_LENGTH);
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        DBUG_RETURN(NULL);
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      }
      new_field->pack_length= (new_field->length + 7) / 8;
      break;
    }
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  case FIELD_TYPE_DECIMAL:
    DBUG_ASSERT(0); /* Was obsolete */
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  }

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  if (!(new_field->flags & BLOB_FLAG) &&
      ((new_field->length > max_field_charlength && type != FIELD_TYPE_SET && 
        type != FIELD_TYPE_ENUM &&
        (type != MYSQL_TYPE_VARCHAR || default_value)) ||
       (!new_field->length &&
        type != MYSQL_TYPE_STRING &&
        type != MYSQL_TYPE_VARCHAR && type != FIELD_TYPE_GEOMETRY)))
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  {
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    my_error(ER_TOO_BIG_FIELDLENGTH, MYF(0),
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             field_name, max_field_charlength); /* purecov: inspected */
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    DBUG_RETURN(NULL);
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  }
  type_modifier&= AUTO_INCREMENT_FLAG;
  if ((~allowed_type_modifier) & type_modifier)
  {
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    my_error(ER_WRONG_FIELD_SPEC, MYF(0), field_name);
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    DBUG_RETURN(NULL);
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  }
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  DBUG_RETURN(new_field);
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}

5626

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

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

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

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


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

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

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


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


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/*
  Add a table to list of used tables

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

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

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TABLE_LIST *st_select_lex::add_table_to_list(THD *thd,
					     Table_ident *table,
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					     LEX_STRING *alias,
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					     ulong table_options,
					     thr_lock_type lock_type,
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					     List<String> *use_index_arg,
					     List<String> *ignore_index_arg,
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                                             LEX_STRING *option)
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{
  register TABLE_LIST *ptr;
  char *alias_str;
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  LEX *lex= thd->lex;
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  DBUG_ENTER("add_table_to_list");

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

  if (!alias)					/* Alias is case sensitive */
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  {
    if (table->sel)
    {
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      my_message(ER_DERIVED_MUST_HAVE_ALIAS,
                 ER(ER_DERIVED_MUST_HAVE_ALIAS), MYF(0));
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      DBUG_RETURN(0);
    }
5754
    if (!(alias_str=thd->memdup(alias_str,table->table.length+1)))
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      DBUG_RETURN(0);
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  }
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  if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
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    DBUG_RETURN(0);				/* purecov: inspected */
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  if (table->db.str)
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  {
    ptr->db= table->db.str;
    ptr->db_length= table->db.length;
  }
  else if (thd->db)
  {
    ptr->db= thd->db;
    ptr->db_length= thd->db_length;
  }
  else
  {
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    /* The following can't be "" as we may do 'casedn_str()' on it */
    ptr->db= empty_c_string;
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    ptr->db_length= 0;
  }
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  if (thd->current_arena->is_stmt_prepare())
    ptr->db= thd->strdup(ptr->db);
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5778
  ptr->alias= alias_str;
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  if (lower_case_table_names && table->table.length)
    my_casedn_str(files_charset_info, table->table.str);
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  ptr->table_name=table->table.str;
  ptr->table_name_length=table->table.length;
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  ptr->lock_type=   lock_type;
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  ptr->updating=    test(table_options & TL_OPTION_UPDATING);
  ptr->force_index= test(table_options & TL_OPTION_FORCE_INDEX);
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  ptr->ignore_leaves= test(table_options & TL_OPTION_IGNORE_LEAVES);
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  ptr->derived=	    table->sel;
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  if (!my_strcasecmp(system_charset_info, ptr->db,
                     information_schema_name.str))
  {
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    ST_SCHEMA_TABLE *schema_table= find_schema_table(thd, ptr->table_name);
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    if (!schema_table ||
        (schema_table->hidden && 
         lex->orig_sql_command == SQLCOM_END))  // not a 'show' command
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    {
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      my_error(ER_UNKNOWN_TABLE, MYF(0),
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               ptr->table_name, information_schema_name.str);
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      DBUG_RETURN(0);
    }
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    ptr->schema_table_name= ptr->table_name;
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    ptr->schema_table= schema_table;
  }
5803
  ptr->select_lex=  lex->current_select;
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  ptr->cacheable_table= 1;
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  if (use_index_arg)
    ptr->use_index=(List<String> *) thd->memdup((gptr) use_index_arg,
						sizeof(*use_index_arg));
  if (ignore_index_arg)
    ptr->ignore_index=(List<String> *) thd->memdup((gptr) ignore_index_arg,
						   sizeof(*ignore_index_arg));
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  ptr->option= option ? option->str : 0;
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  /* check that used name is unique */
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  if (lock_type != TL_IGNORE)
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  {
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    for (TABLE_LIST *tables=(TABLE_LIST*) table_list.first ;
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	 tables ;
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	 tables=tables->next_local)
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    {
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      if (!my_strcasecmp(table_alias_charset, alias_str, tables->alias) &&
	  !strcmp(ptr->db, tables->db))
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      {
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	my_error(ER_NONUNIQ_TABLE, MYF(0), alias_str); /* purecov: tested */
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	DBUG_RETURN(0);				/* purecov: tested */
      }
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    }
  }
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  /* Link table in local list (list for current select) */
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  table_list.link_in_list((byte*) ptr, (byte**) &ptr->next_local);
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  /* Link table in global list (all used tables) */
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  lex->add_to_query_tables(ptr);
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  DBUG_RETURN(ptr);
}

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/*
  Initialize a new table list for a nested join

  SYNOPSIS
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    init_nested_join()
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    thd         current thread
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  DESCRIPTION
    The function initializes a structure of the TABLE_LIST type
    for a nested join. It sets up its nested join list as empty.
    The created structure is added to the front of the current
    join list in the st_select_lex object. Then the function
    changes the current nest level for joins to refer to the newly
    created empty list after having saved the info on the old level
    in the initialized structure.

  RETURN VALUE
    0,  if success
    1,  otherwise
*/

bool st_select_lex::init_nested_join(THD *thd)
{
  TABLE_LIST *ptr;
  NESTED_JOIN *nested_join;
  DBUG_ENTER("init_nested_join");
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  if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))) ||
      !(nested_join= ptr->nested_join=
                    (NESTED_JOIN *) thd->calloc(sizeof(NESTED_JOIN))))
    DBUG_RETURN(1);
  join_list->push_front(ptr);
  ptr->embedding= embedding;
  ptr->join_list= join_list;
  embedding= ptr;
  join_list= &nested_join->join_list;
  join_list->empty();
  DBUG_RETURN(0);
}


/*
  End a nested join table list

  SYNOPSIS
    end_nested_join()
    thd         current thread

  DESCRIPTION
    The function returns to the previous join nest level.
    If the current level contains only one member, the function
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    moves it one level up, eliminating the nest.
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  RETURN VALUE
    Pointer to TABLE_LIST element added to the total table list, if success
    0, otherwise
*/

TABLE_LIST *st_select_lex::end_nested_join(THD *thd)
{
  TABLE_LIST *ptr;
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  NESTED_JOIN *nested_join;
5897
  DBUG_ENTER("end_nested_join");
5898

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  DBUG_ASSERT(embedding);
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  ptr= embedding;
  join_list= ptr->join_list;
  embedding= ptr->embedding;
5903
  nested_join= ptr->nested_join;
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  if (nested_join->join_list.elements == 1)
  {
    TABLE_LIST *embedded= nested_join->join_list.head();
    join_list->pop();
    embedded->join_list= join_list;
    embedded->embedding= embedding;
    join_list->push_front(embedded);
    ptr= embedded;
  }
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  else if (nested_join->join_list.elements == 0)
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  {
    join_list->pop();
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    ptr= 0;                                     // return value
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  }
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  DBUG_RETURN(ptr);
}


/*
  Nest last join operation

  SYNOPSIS
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    nest_last_join()
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    thd         current thread

  DESCRIPTION
    The function nest last join operation as if it was enclosed in braces.

  RETURN VALUE
    Pointer to TABLE_LIST element created for the new nested join, if success
    0, otherwise
*/

TABLE_LIST *st_select_lex::nest_last_join(THD *thd)
{
  TABLE_LIST *ptr;
  NESTED_JOIN *nested_join;
  DBUG_ENTER("nest_last_join");
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  if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))) ||
      !(nested_join= ptr->nested_join=
                    (NESTED_JOIN *) thd->calloc(sizeof(NESTED_JOIN))))
    DBUG_RETURN(0);
  ptr->embedding= embedding;
  ptr->join_list= join_list;
  List<TABLE_LIST> *embedded_list= &nested_join->join_list;
  embedded_list->empty();
  for (int i=0; i < 2; i++)
  {
    TABLE_LIST *table= join_list->pop();
    table->join_list= embedded_list;
    table->embedding= ptr;
    embedded_list->push_back(table);
  }
  join_list->push_front(ptr);
  nested_join->used_tables= nested_join->not_null_tables= (table_map) 0;
  DBUG_RETURN(ptr);
}


/*
5965
  Save names for a join with using clause
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  SYNOPSIS
    save_names_for_using_list
    tab1      left table in join
    tab2      right table in join

  DESCRIPTION
    The function saves the full names of the tables in st_select_lex
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    to be able to build later an on expression to replace the using clause.

5976
  RETURN VALUE
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    None
*/
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void st_select_lex::save_names_for_using_list(TABLE_LIST *tab1,
                                              TABLE_LIST *tab2)
{
  while (tab1->nested_join)
  {
    tab1= tab1->nested_join->join_list.head();
  }
  db1= tab1->db;
  table1= tab1->alias;
  while (tab2->nested_join)
  {
    TABLE_LIST *next;
    List_iterator_fast<TABLE_LIST> it(tab2->nested_join->join_list);
    tab2= it++;
    while ((next= it++))
      tab2= next;
  }
  db2= tab2->db;
  table2= tab2->alias;
}
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/*
  Add a table to the current join list

  SYNOPSIS
    add_joined_table()
    table       the table to add

  DESCRIPTION
    The function puts a table in front of the current join list
    of st_select_lex object.
    Thus, joined tables are put into this list in the reverse order
    (the most outer join operation follows first).

  RETURN VALUE
    None
*/

void st_select_lex::add_joined_table(TABLE_LIST *table)
{
  DBUG_ENTER("add_joined_table");
  join_list->push_front(table);
  table->join_list= join_list;
  table->embedding= embedding;
  DBUG_VOID_RETURN;
}


/*
  Convert a right join into equivalent left join

  SYNOPSIS
    convert_right_join()
    thd         current thread
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  DESCRIPTION
    The function takes the current join list t[0],t[1] ... and
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    effectively converts it into the list t[1],t[0] ...
    Although the outer_join flag for the new nested table contains
    JOIN_TYPE_RIGHT, it will be handled as the inner table of a left join
    operation.

  EXAMPLES
    SELECT * FROM t1 RIGHT JOIN t2 ON on_expr =>
      SELECT * FROM t2 LEFT JOIN t1 ON on_expr

    SELECT * FROM t1,t2 RIGHT JOIN t3 ON on_expr =>
      SELECT * FROM t1,t3 LEFT JOIN t2 ON on_expr

    SELECT * FROM t1,t2 RIGHT JOIN (t3,t4) ON on_expr =>
      SELECT * FROM t1,(t3,t4) LEFT JOIN t2 ON on_expr

    SELECT * FROM t1 LEFT JOIN t2 ON on_expr1 RIGHT JOIN t3  ON on_expr2 =>
      SELECT * FROM t3 LEFT JOIN (t1 LEFT JOIN t2 ON on_expr2) ON on_expr1

  RETURN
    Pointer to the table representing the inner table, if success
    0, otherwise
*/

6061
TABLE_LIST *st_select_lex::convert_right_join()
6062 6063
{
  TABLE_LIST *tab2= join_list->pop();
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  TABLE_LIST *tab1= join_list->pop();
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  DBUG_ENTER("convert_right_join");

  join_list->push_front(tab2);
  join_list->push_front(tab1);
  tab1->outer_join|= JOIN_TYPE_RIGHT;

  DBUG_RETURN(tab1);
}

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/*
  Set lock for all tables in current select level

  SYNOPSIS:
    set_lock_for_tables()
    lock_type			Lock to set for tables

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

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

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

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6104

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void add_join_on(TABLE_LIST *b,Item *expr)
{
6107
  if (expr)
6108
  {
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    if (!b->on_expr)
      b->on_expr=expr;
    else
    {
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      /* This only happens if you have both a right and left join */
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      b->on_expr=new Item_cond_and(b->on_expr,expr);
    }
    b->on_expr->top_level_item();
6117
  }
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}


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

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

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

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

6144
/*
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  Reload/resets privileges and the different caches.

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

  RETURN
    0	 ok
    !=0  error
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*/

6164 6165
bool reload_acl_and_cache(THD *thd, ulong options, TABLE_LIST *tables,
                          bool *write_to_binlog)
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{
  bool result=0;
  select_errors=0;				/* Write if more errors */
6169
  bool tmp_write_to_binlog= 1;
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  if (options & REFRESH_GRANT)
  {
6173
    acl_reload(thd);
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    grant_reload(thd);
6175
    reset_mqh((LEX_USER *)NULL, TRUE);
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  }
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#endif
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  if (options & REFRESH_LOG)
  {
6180
    /*
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      Flush the normal query log, the update log, the binary log,
      the slow query log, and the relay log (if it exists).
6183
    */
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6185
    /*
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     Writing this command to the binlog may result in infinite loops when doing
     mysqlbinlog|mysql, and anyway it does not really make sense to log it
     automatically (would cause more trouble to users than it would help them)
    */
    tmp_write_to_binlog= 0;
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    mysql_log.new_file(1);
    mysql_slow_log.new_file(1);
6193
    mysql_bin_log.rotate_and_purge(RP_FORCE_ROTATE);
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#ifdef HAVE_REPLICATION
6195
    pthread_mutex_lock(&LOCK_active_mi);
6196
    rotate_relay_log(active_mi);
6197
    pthread_mutex_unlock(&LOCK_active_mi);
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#endif
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    if (ha_flush_logs())
      result=1;
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    if (flush_error_log())
      result=1;
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  }
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#ifdef HAVE_QUERY_CACHE
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  if (options & REFRESH_QUERY_CACHE_FREE)
  {
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    query_cache.pack();				// FLUSH QUERY CACHE
6208
    options &= ~REFRESH_QUERY_CACHE;    // Don't flush cache, just free memory
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  }
  if (options & (REFRESH_TABLES | REFRESH_QUERY_CACHE))
  {
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    query_cache.flush();			// RESET QUERY CACHE
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  }
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#endif /*HAVE_QUERY_CACHE*/
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  /*
    Note that if REFRESH_READ_LOCK bit is set then REFRESH_TABLES is set too
    (see sql_yacc.yy)
  */
  if (options & (REFRESH_TABLES | REFRESH_READ_LOCK)) 
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  {
6221
    if ((options & REFRESH_READ_LOCK) && thd)
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    {
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      /*
	Writing to the binlog could cause deadlocks, as we don't log
	UNLOCK TABLES
      */
6227
      tmp_write_to_binlog= 0;
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      if (lock_global_read_lock(thd))
	return 1;
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      result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1,
                                 tables);
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      if (make_global_read_lock_block_commit(thd))
      {
        /* Don't leave things in a half-locked state */
        unlock_global_read_lock(thd);
        return 1;
      }
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    }
6239 6240
    else
      result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1, tables);
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    my_dbopt_cleanup();
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  }
  if (options & REFRESH_HOSTS)
    hostname_cache_refresh();
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  if (thd && (options & REFRESH_STATUS))
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    refresh_status();
  if (options & REFRESH_THREADS)
    flush_thread_cache();
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#ifdef HAVE_REPLICATION
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  if (options & REFRESH_MASTER)
6251 6252
  {
    tmp_write_to_binlog= 0;
6253 6254
    if (reset_master(thd))
      result=1;
6255
  }
6256
#endif
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#ifdef OPENSSL
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   if (options & REFRESH_DES_KEY_FILE)
   {
     if (des_key_file)
       result=load_des_key_file(des_key_file);
   }
#endif
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#ifdef HAVE_REPLICATION
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 if (options & REFRESH_SLAVE)
 {
6267
   tmp_write_to_binlog= 0;
6268
   pthread_mutex_lock(&LOCK_active_mi);
6269
   if (reset_slave(thd, active_mi))
6270
     result=1;
6271
   pthread_mutex_unlock(&LOCK_active_mi);
6272
 }
6273
#endif
6274
 if (options & REFRESH_USER_RESOURCES)
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   reset_mqh((LEX_USER *) NULL);
6276 6277
 if (write_to_binlog)
   *write_to_binlog= tmp_write_to_binlog;
6278
 return result;
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}

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/*
  kill on thread

  SYNOPSIS
    kill_one_thread()
    thd			Thread class
    id			Thread id

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

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void kill_one_thread(THD *thd, ulong id, bool only_kill_query)
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{
  THD *tmp;
  uint error=ER_NO_SUCH_THREAD;
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  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For unlink from list
  I_List_iterator<THD> it(threads);
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  while ((tmp=it++))
  {
    if (tmp->thread_id == id)
    {
6303 6304
      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))
    {
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      tmp->awake(only_kill_query ? THD::KILL_QUERY : THD::KILL_CONNECTION);
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      error=0;
    }
    else
      error=ER_KILL_DENIED_ERROR;
    pthread_mutex_unlock(&tmp->LOCK_delete);
  }

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  if (!error)
6322
    send_ok(thd);
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  else
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    my_error(error, MYF(0), id);
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}

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/* Clear most status variables */

static void refresh_status(void)
{
  pthread_mutex_lock(&LOCK_status);
  for (struct show_var_st *ptr=status_vars; ptr->name; ptr++)
  {
    if (ptr->type == SHOW_LONG)
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      *(ulong*) ptr->value= 0;
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    else if (ptr->type == SHOW_LONG_STATUS)
    {
      THD *thd= current_thd;
      /* We must update the global status before cleaning up the thread */
      add_to_status(&global_status_var, &thd->status_var);
      bzero((char*) &thd->status_var, sizeof(thd->status_var));
    }
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  }
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  /* Reset the counters of all key caches (default and named). */
  process_key_caches(reset_key_cache_counters);
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  pthread_mutex_unlock(&LOCK_status);
}
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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, const char **filename_ptr,
			       const char *table_name)
6355
{
6356
  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))
  {
6364
    my_error(ER_WRONG_TABLE_NAME, MYF(0), *filename_ptr);
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    return 1;
  }
  /* Fix is using unix filename format on dos */
  strmov(buff,*filename_ptr);
6369
  end=convert_dirname(buff, *filename_ptr, NullS);
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  if (!(ptr=thd->alloc((uint) (end-buff)+(uint) strlen(table_name)+1)))
6371 6372
    return 1;					// End of memory
  *filename_ptr=ptr;
6373
  strxmov(ptr,buff,table_name,NullS);
6374 6375
  return 0;
}
6376

6377

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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;
6392 6393
  LEX *lex= thd->lex;
  if (lex->current_select != &lex->select_lex)
6394 6395
  {
    char command[80];
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    strmake(command, lex->yylval->symbol.str,
	    min(lex->yylval->symbol.length, sizeof(command)-1));
6398
    my_error(ER_CANT_USE_OPTION_HERE, MYF(0), command);
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    return 1;
  }
  return 0;
}
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/*
  Setup locking for multi-table updates. Used by the replication slave.
  Replication slave SQL thread examines (all_tables_not_ok()) the
  locking state of referenced tables to determine if the query has to
  be executed or ignored. Since in multi-table update, the 
  'default' lock is read-only, this lock is corrected early enough by
  calling this function, before the slave decides to execute/ignore.

  SYNOPSIS
    check_multi_update_lock()
    thd		Current thread

  RETURN VALUES
    0	ok
    1	error
*/
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static bool check_multi_update_lock(THD *thd)
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{
  bool res= 1;
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  LEX *lex= thd->lex;
  TABLE_LIST *table, *tables= lex->query_tables;
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  DBUG_ENTER("check_multi_update_lock");
  
  if (check_db_used(thd, tables))
    goto error;

  /*
    Ensure that we have UPDATE or SELECT privilege for each table
    The exact privilege is checked in mysql_multi_update()
  */
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  for (table= tables ; table ; table= table->next_local)
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  {
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    TABLE_LIST *save= table->next_local;
    table->next_local= 0;
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    if ((check_access(thd, UPDATE_ACL, table->db, &table->grant.privilege,0,1) ||
        (grant_option && check_grant(thd, UPDATE_ACL, table,0,1,1))) &&
	check_one_table_access(thd, SELECT_ACL, table))
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	goto error;
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    table->next_local= save;
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  }
    
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  if (mysql_multi_update_prepare(thd))
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    goto error;
  
  res= 0;
  
error:
  DBUG_RETURN(res);
}
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Comp_creator *comp_eq_creator(bool invert)
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{
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  return invert?(Comp_creator *)&ne_creator:(Comp_creator *)&eq_creator;
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}

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Comp_creator *comp_ge_creator(bool invert)
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{
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  return invert?(Comp_creator *)&lt_creator:(Comp_creator *)&ge_creator;
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}

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Comp_creator *comp_gt_creator(bool invert)
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{
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  return invert?(Comp_creator *)&le_creator:(Comp_creator *)&gt_creator;
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}

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Comp_creator *comp_le_creator(bool invert)
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{
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  return invert?(Comp_creator *)&gt_creator:(Comp_creator *)&le_creator;
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}

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Comp_creator *comp_lt_creator(bool invert)
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{
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  return invert?(Comp_creator *)&ge_creator:(Comp_creator *)&lt_creator;
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}

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Comp_creator *comp_ne_creator(bool invert)
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{
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  return invert?(Comp_creator *)&eq_creator:(Comp_creator *)&ne_creator;
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}
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/*
  Construct ALL/ANY/SOME subquery Item

  SYNOPSIS
    all_any_subquery_creator()
    left_expr - pointer to left expression
    cmp - compare function creator
    all - true if we create ALL subquery
    select_lex - pointer on parsed subquery structure

  RETURN VALUE
    constructed Item (or 0 if out of memory)
*/
Item * all_any_subquery_creator(Item *left_expr,
				chooser_compare_func_creator cmp,
				bool all,
				SELECT_LEX *select_lex)
{
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  if ((cmp == &comp_eq_creator) && !all)       //  = ANY <=> IN
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    return new Item_in_subselect(left_expr, select_lex);
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  if ((cmp == &comp_ne_creator) && all)        // <> ALL <=> NOT IN
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    return new Item_func_not(new Item_in_subselect(left_expr, select_lex));

  Item_allany_subselect *it=
6516
    new Item_allany_subselect(left_expr, (*cmp)(all), select_lex, all);
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  if (all)
6518
    return it->upper_item= new Item_func_not_all(it);	/* ALL */
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6520
  return it->upper_item= new Item_func_nop_all(it);      /* ANY/SOME */
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}
6522 6523


6524 6525 6526 6527 6528 6529 6530 6531 6532 6533 6534 6535
/*
  CREATE INDEX and DROP INDEX are implemented by calling ALTER TABLE with
  the proper arguments.  This isn't very fast but it should work for most
  cases.

  In the future ALTER TABLE will notice that only added indexes
  and create these one by one for the existing table without having to do
  a full rebuild.

  One should normally create all indexes with CREATE TABLE or ALTER TABLE.
*/

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bool mysql_create_index(THD *thd, TABLE_LIST *table_list, List<Key> &keys)
6537 6538
{
  List<create_field> fields;
6539 6540
  ALTER_INFO alter_info;
  alter_info.flags= ALTER_ADD_INDEX;
6541 6542 6543 6544 6545
  HA_CREATE_INFO create_info;
  DBUG_ENTER("mysql_create_index");
  bzero((char*) &create_info,sizeof(create_info));
  create_info.db_type=DB_TYPE_DEFAULT;
  create_info.default_table_charset= thd->variables.collation_database;
6546
  DBUG_RETURN(mysql_alter_table(thd,table_list->db,table_list->table_name,
6547
				&create_info, table_list,
6548
				fields, keys, 0, (ORDER*)0,
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				DUP_ERROR, 0, &alter_info, 1));
6550 6551 6552
}


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bool mysql_drop_index(THD *thd, TABLE_LIST *table_list, ALTER_INFO *alter_info)
6554 6555 6556 6557 6558 6559 6560 6561
{
  List<create_field> fields;
  List<Key> keys;
  HA_CREATE_INFO create_info;
  DBUG_ENTER("mysql_drop_index");
  bzero((char*) &create_info,sizeof(create_info));
  create_info.db_type=DB_TYPE_DEFAULT;
  create_info.default_table_charset= thd->variables.collation_database;
6562 6563
  alter_info->clear();
  alter_info->flags= ALTER_DROP_INDEX;
6564
  DBUG_RETURN(mysql_alter_table(thd,table_list->db,table_list->table_name,
6565
				&create_info, table_list,
6566
				fields, keys, 0, (ORDER*)0,
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				DUP_ERROR, 0, alter_info, 1));
6568
}
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merge  
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6569 6570


6571 6572 6573 6574 6575
/*
  Multi update query pre-check

  SYNOPSIS
    multi_update_precheck()
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6576
    thd		Thread handler
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VIEW  
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6577
    tables	Global/local table list (have to be the same)
6578

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  RETURN VALUE
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    FALSE OK
    TRUE  Error
6582
*/
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bool multi_update_precheck(THD *thd, TABLE_LIST *tables)
6585 6586 6587 6588 6589
{
  const char *msg= 0;
  TABLE_LIST *table;
  LEX *lex= thd->lex;
  SELECT_LEX *select_lex= &lex->select_lex;
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VIEW  
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6590
  DBUG_ENTER("multi_update_precheck");
6591 6592 6593

  if (select_lex->item_list.elements != lex->value_list.elements)
  {
6594
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
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    DBUG_RETURN(TRUE);
6596 6597 6598 6599 6600
  }
  /*
    Ensure that we have UPDATE or SELECT privilege for each table
    The exact privilege is checked in mysql_multi_update()
  */
unknown's avatar
VIEW  
unknown committed
6601
  for (table= tables; table; table= table->next_local)
6602
  {
6603 6604 6605 6606 6607 6608
    if (table->derived)
      table->grant.privilege= SELECT_ACL;
    else if ((check_access(thd, UPDATE_ACL, table->db,
                           &table->grant.privilege, 0, 1) ||
              grant_option &&
              check_grant(thd, UPDATE_ACL, table, 0, 1, 1)) &&
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6609 6610 6611
             (check_access(thd, SELECT_ACL, table->db,
                           &table->grant.privilege, 0, 0) ||
              grant_option && check_grant(thd, SELECT_ACL, table, 0, 1, 0)))
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      DBUG_RETURN(TRUE);
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VIEW  
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6614
    table->table_in_first_from_clause= 1;
6615
  }
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  /*
    Is there tables of subqueries?
  */
6619 6620
  if (&lex->select_lex != lex->all_selects_list)
  {
6621
    DBUG_PRINT("info",("Checking sub query list"));
unknown's avatar
VIEW  
unknown committed
6622
    for (table= tables; table; table= table->next_global)
6623
    {
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6624 6625 6626
      if (!my_tz_check_n_skip_implicit_tables(&table,
                                              lex->time_zone_tables_used) &&
          !table->table_in_first_from_clause)
6627 6628 6629
      {
	if (check_access(thd, SELECT_ACL, table->db,
			 &table->grant.privilege, 0, 0) ||
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6630
	    grant_option && check_grant(thd, SELECT_ACL, table, 0, 1, 0))
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	  DBUG_RETURN(TRUE);
6632 6633 6634 6635 6636 6637 6638 6639 6640 6641 6642 6643
      }
    }
  }

  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)
  {
    my_error(ER_WRONG_USAGE, MYF(0), "UPDATE", msg);
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6644
    DBUG_RETURN(TRUE);
6645
  }
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6646
  DBUG_RETURN(FALSE);
6647 6648 6649 6650 6651 6652 6653
}

/*
  Multi delete query pre-check

  SYNOPSIS
    multi_delete_precheck()
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6654
    thd			Thread handler
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VIEW  
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6655
    tables		Global/local table list
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    table_count		Pointer to table counter
6657

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  RETURN VALUE
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    FALSE OK
    TRUE  error
6661
*/
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bool multi_delete_precheck(THD *thd, TABLE_LIST *tables, uint *table_count)
6664 6665 6666 6667
{
  SELECT_LEX *select_lex= &thd->lex->select_lex;
  TABLE_LIST *aux_tables=
    (TABLE_LIST *)thd->lex->auxilliary_table_list.first;
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  TABLE_LIST *target_tbl;
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VIEW  
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6669
  DBUG_ENTER("multi_delete_precheck");
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  *table_count= 0;
6672 6673 6674 6675 6676 6677

  /* sql_yacc guarantees that tables and aux_tables are not zero */
  DBUG_ASSERT(aux_tables != 0);
  if (check_db_used(thd, tables) || check_db_used(thd,aux_tables) ||
      check_table_access(thd,SELECT_ACL, tables,0) ||
      check_table_access(thd,DELETE_ACL, aux_tables,0))
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6678
    DBUG_RETURN(TRUE);
6679 6680
  if ((thd->options & OPTION_SAFE_UPDATES) && !select_lex->where)
  {
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    my_message(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE,
               ER(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE), MYF(0));
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    DBUG_RETURN(TRUE);
6684
  }
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VIEW  
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6685
  for (target_tbl= aux_tables; target_tbl; target_tbl= target_tbl->next_local)
6686 6687 6688 6689
  {
    (*table_count)++;
    /* All tables in aux_tables must be found in FROM PART */
    TABLE_LIST *walk;
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VIEW  
unknown committed
6690
    for (walk= tables; walk; walk= walk->next_local)
6691
    {
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6692 6693 6694
      if (!my_strcasecmp(table_alias_charset,
			 target_tbl->alias, walk->alias) &&
	  !strcmp(walk->db, target_tbl->db))
6695 6696 6697 6698
	break;
    }
    if (!walk)
    {
6699
      my_error(ER_UNKNOWN_TABLE, MYF(0),
6700
               target_tbl->table_name, "MULTI DELETE");
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6701
      DBUG_RETURN(TRUE);
6702
    }
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6703
    walk->lock_type= target_tbl->lock_type;
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VIEW  
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6704
    target_tbl->correspondent_table= walk;	// Remember corresponding table
6705
  }
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6706
  DBUG_RETURN(FALSE);
6707 6708 6709
}


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/*
  simple UPDATE query pre-check

  SYNOPSIS
    update_precheck()
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    thd		Thread handler
    tables	Global table list
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  RETURN VALUE
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    FALSE OK
    TRUE  Error
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6721
*/
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6722

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6723
bool update_precheck(THD *thd, TABLE_LIST *tables)
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{
  DBUG_ENTER("update_precheck");
  if (thd->lex->select_lex.item_list.elements != thd->lex->value_list.elements)
  {
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6728
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
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6729
    DBUG_RETURN(TRUE);
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6730
  }
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  DBUG_RETURN(check_db_used(thd, tables) ||
	       check_one_table_access(thd, UPDATE_ACL, tables));
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}


/*
  simple DELETE query pre-check

  SYNOPSIS
    delete_precheck()
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6741 6742
    thd		Thread handler
    tables	Global table list
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6743 6744

  RETURN VALUE
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    FALSE  OK
    TRUE   error
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*/
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bool delete_precheck(THD *thd, TABLE_LIST *tables)
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{
  DBUG_ENTER("delete_precheck");
  if (check_one_table_access(thd, DELETE_ACL, tables))
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6753
    DBUG_RETURN(TRUE);
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6754
  /* Set privilege for the WHERE clause */
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6755
  tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
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6756
  DBUG_RETURN(FALSE);
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}


/*
  simple INSERT query pre-check

  SYNOPSIS
    insert_precheck()
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    thd		Thread handler
    tables	Global table list
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  RETURN VALUE
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    FALSE  OK
    TRUE   error
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6771
*/
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merge  
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6773
bool insert_precheck(THD *thd, TABLE_LIST *tables)
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6774 6775 6776 6777
{
  LEX *lex= thd->lex;
  DBUG_ENTER("insert_precheck");

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  /*
    Check that we have modify privileges for the first table and
    select privileges for the rest
  */
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  ulong privilege= (INSERT_ACL |
                    (lex->duplicates == DUP_REPLACE ? DELETE_ACL : 0) |
                    (lex->value_list.elements ? UPDATE_ACL : 0));
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  if (check_one_table_access(thd, privilege, tables))
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    DBUG_RETURN(TRUE);
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6788

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6789
  if (lex->update_list.elements != lex->value_list.elements)
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6790
  {
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6791
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
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6792
    DBUG_RETURN(TRUE);
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6793
  }
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6794
  DBUG_RETURN(FALSE);
6795
}
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6796 6797 6798 6799 6800 6801 6802


/*
  CREATE TABLE query pre-check

  SYNOPSIS
    create_table_precheck()
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6803 6804 6805
    thd			Thread handler
    tables		Global table list
    create_table	Table which will be created
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6806 6807

  RETURN VALUE
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    FALSE   OK
    TRUE   Error
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6810
*/
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6811

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bool create_table_precheck(THD *thd, TABLE_LIST *tables,
                           TABLE_LIST *create_table)
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unknown committed
6814 6815
{
  LEX *lex= thd->lex;
6816 6817
  SELECT_LEX *select_lex= &lex->select_lex;
  ulong want_priv;
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merge  
unknown committed
6818
  bool error= TRUE;                                 // Error message is given
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6819
  DBUG_ENTER("create_table_precheck");
6820 6821 6822

  want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
              CREATE_TMP_ACL : CREATE_ACL);
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  lex->create_info.alias= create_table->alias;
  if (check_access(thd, want_priv, create_table->db,
		   &create_table->grant.privilege, 0, 0) ||
      check_merge_table_access(thd, create_table->db,
			       (TABLE_LIST *)
			       lex->create_info.merge_list.first))
6829 6830 6831 6832 6833 6834 6835 6836 6837 6838
    goto err;
  if (grant_option && want_priv != CREATE_TMP_ACL &&
      check_grant(thd, want_priv, create_table, 0, UINT_MAX, 0))
    goto err;

  if (select_lex->item_list.elements)
  {
    /* Check permissions for used tables in CREATE TABLE ... SELECT */

    /*
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6839 6840 6841
      Only do the check for PS, becasue we on execute we have to check that
      against the opened tables to ensure we don't use a table that is part
      of the view (which can only be done after the table has been opened).
6842
    */
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unknown committed
6843
    if (thd->current_arena->is_stmt_prepare())
6844
    {
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6845 6846 6847 6848
      /*
        For temporary tables we don't have to check if the created table exists
      */
      if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
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6849
          find_table_in_global_list(tables, create_table->db,
6850
                                    create_table->table_name))
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unknown committed
6851
      {
6852
	error= FALSE;
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6853 6854 6855
        goto err;
      }
    }
6856 6857 6858
    if (tables && check_table_access(thd, SELECT_ACL, tables,0))
      goto err;
  }
unknown's avatar
merge  
unknown committed
6859
  error= FALSE;
6860 6861 6862

err:
  DBUG_RETURN(error);
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6863
}
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6864 6865 6866 6867 6868 6869 6870


/*
  negate given expression

  SYNOPSIS
    negate_expression()
6871
    thd  thread handler
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6872 6873 6874 6875 6876 6877 6878 6879 6880 6881 6882 6883 6884 6885 6886 6887 6888 6889 6890 6891 6892 6893 6894 6895 6896 6897 6898 6899
    expr expression for negation

  RETURN
    negated expression
*/

Item *negate_expression(THD *thd, Item *expr)
{
  Item *negated;
  if (expr->type() == Item::FUNC_ITEM &&
      ((Item_func *) expr)->functype() == Item_func::NOT_FUNC)
  {
    /* it is NOT(NOT( ... )) */
    Item *arg= ((Item_func *) expr)->arguments()[0];
    enum_parsing_place place= thd->lex->current_select->parsing_place;
    if (arg->is_bool_func() || place == IN_WHERE || place == IN_HAVING)
      return arg;
    /*
      if it is not boolean function then we have to emulate value of
      not(not(a)), it will be a != 0
    */
    return new Item_func_ne(arg, new Item_int((char*) "0", 0, 1));
  }

  if ((negated= expr->neg_transformer(thd)) != 0)
    return negated;
  return new Item_func_not(expr);
}