sql_parse.cc 70.6 KB
Newer Older
unknown's avatar
unknown committed
1
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
2

unknown's avatar
unknown committed
3 4 5 6
   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.
7

unknown's avatar
unknown committed
8 9 10 11
   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.
12

unknown's avatar
unknown committed
13 14 15 16 17 18 19
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */


#include "mysql_priv.h"
#include "sql_acl.h"
20
#include "sql_repl.h"
unknown's avatar
unknown committed
21 22 23 24 25 26 27 28 29 30
#include <m_ctype.h>
#include <thr_alarm.h>
#include <myisam.h>
#include <my_dir.h>

#define SCRAMBLE_LENGTH 8


extern int yyparse(void);
extern "C" pthread_mutex_t THR_LOCK_keycache;
31 32 33
#ifdef SOLARIS
extern "C" int gethostname(char *name, int namelen);
#endif
unknown's avatar
unknown committed
34

35
static bool check_table_access(THD *thd,uint want_access, TABLE_LIST *tables);
unknown's avatar
unknown committed
36
static bool check_db_used(THD *thd,TABLE_LIST *tables);
37
static bool check_merge_table_access(THD *thd, char *db, TABLE_LIST *tables);
unknown's avatar
unknown committed
38 39 40 41 42 43
static bool check_dup(THD *thd,const char *db,const char *name,
		      TABLE_LIST *tables);
static void mysql_init_query(THD *thd);
static void remove_escape(char *name);
static void refresh_status(void);

44
const char *any_db="*any*";	// Special symbol for check_access
unknown's avatar
unknown committed
45 46 47 48 49

const char *command_name[]={
  "Sleep", "Quit", "Init DB", "Query", "Field List", "Create DB",
  "Drop DB", "Refresh", "Shutdown", "Statistics", "Processlist",
  "Connect","Kill","Debug","Ping","Time","Delayed_insert","Change user",
unknown's avatar
unknown committed
50
  "Binlog Dump","Table Dump",  "Connect Out"
unknown's avatar
unknown committed
51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107
};

bool volatile abort_slave = 0;

#ifdef HAVE_OPENSSL
extern VioSSLAcceptorFd* ssl_acceptor_fd;
#endif /* HAVE_OPENSSL */

#ifdef __WIN__
static void  test_signal(int sig_ptr)
{
#ifndef DBUG_OFF
  MessageBox(NULL,"Test signal","DBUG",MB_OK);
#endif
}
static void init_signals(void)
{
  int signals[7] = {SIGINT,SIGILL,SIGFPE,SIGSEGV,SIGTERM,SIGBREAK,SIGABRT } ;
  for(int i=0 ; i < 7 ; i++)
    signal( signals[i], test_signal) ;
}
#endif

/*
** Check if user is ok
** Updates:
** thd->user, thd->master_access, thd->priv_user, thd->db, thd->db_access
*/

static bool check_user(THD *thd,enum_server_command command, const char *user,
		       const char *passwd, const char *db, bool check_count)
{
  NET *net= &thd->net;
  thd->db=0;

  if (!(thd->user = my_strdup(user, MYF(0))))
  {
    send_error(net,ER_OUT_OF_RESOURCES);
    return 1;
  }
  thd->master_access=acl_getroot(thd->host, thd->ip, thd->user,
				 passwd, thd->scramble, &thd->priv_user,
				 protocol_version == 9 ||
				 !(thd->client_capabilities &
				   CLIENT_LONG_PASSWORD));
  DBUG_PRINT("general",
	     ("Capabilities: %d  packet_length: %d  Host: '%s'  User: '%s'  Using password: %s  Access: %u  db: '%s'",
	      thd->client_capabilities, thd->max_packet_length,
	      thd->host ? thd->host : thd->ip, thd->priv_user,
	      passwd[0] ? "yes": "no",
	      thd->master_access, thd->db ? thd->db : "*none*"));
  if (thd->master_access & NO_ACCESS)
  {
    net_printf(net, ER_ACCESS_DENIED_ERROR,
	       thd->user,
	       thd->host ? thd->host : thd->ip,
	       passwd[0] ? ER(ER_YES) : ER(ER_NO));
108
    mysql_log.write(thd,COM_CONNECT,ER(ER_ACCESS_DENIED_ERROR),
unknown's avatar
unknown committed
109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125
		    thd->user,
		    thd->host ? thd->host : thd->ip ? thd->ip : "unknown ip",
		    passwd[0] ? ER(ER_YES) : ER(ER_NO));
    return(1);					// Error already given
  }
  if (check_count)
  {
    VOID(pthread_mutex_lock(&LOCK_thread_count));
    bool tmp=(thread_count - delayed_insert_threads >= max_connections &&
	      !(thd->master_access & PROCESS_ACL));
    VOID(pthread_mutex_unlock(&LOCK_thread_count));
    if (tmp)
    {						// Too many connections
      send_error(net, ER_CON_COUNT_ERROR);
      return(1);
    }
  }
126
  mysql_log.write(thd,command,
unknown's avatar
unknown committed
127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162
		  (thd->priv_user == thd->user ?
		   (char*) "%s@%s on %s" :
		   (char*) "%s@%s as anonymous on %s"),
		  user,
		  thd->host ? thd->host : thd->ip ? thd->ip : "unknown ip",
		  db ? db : (char*) "");
  thd->db_access=0;
  if (db && db[0])
    return test(mysql_change_db(thd,db));
  else
    send_ok(net);				// Ready to handle questions
  return 0;					// ok
}


/*
** check connnetion and get priviliges
** returns 0 on ok, -1 < if error is given > 0 on error.
*/


static int
check_connections(THD *thd)
{
  uint connect_errors=0;
  NET *net= &thd->net;
  /*
  ** store the connection details
  */
  DBUG_PRINT("info", (("check_connections called by thread %d"),
	     thd->thread_id));
  DBUG_PRINT("general",("New connection received on %s",
			vio_description(net->vio)));
  if (!thd->host)                           // If TCP/IP connection
  {
    char ip[17];
163

unknown's avatar
unknown committed
164 165 166 167 168 169 170
    if (vio_peer_addr(net->vio,ip))
      return (ER_BAD_HOST_ERROR);
    if (!(thd->ip = my_strdup(ip,MYF(0))))
      return (ER_OUT_OF_RESOURCES);
#if !defined(HAVE_SYS_UN_H) || defined(HAVE_mit_thread)
    /* Fast local hostname resolve for Win32 */
    if (!strcmp(thd->ip,"127.0.0.1"))
171
      thd->host=(char*) localhost;
unknown's avatar
unknown committed
172 173 174 175 176 177 178 179 180 181 182 183 184 185 186
    else
#endif
    if (!(specialflag & SPECIAL_NO_RESOLVE))
    {
      vio_in_addr(net->vio,&thd->remote.sin_addr);
      thd->host=ip_to_hostname(&thd->remote.sin_addr,&connect_errors);
      if (connect_errors > max_connect_errors)
	return(ER_HOST_IS_BLOCKED);
    }
    DBUG_PRINT("general",("Host: %s  ip: %s",
			  thd->host ? thd->host : "unknown host",
			  thd->ip ? thd->ip : "unknown ip"));
    if (acl_check_host(thd->host,thd->ip))
      return(ER_HOST_NOT_PRIVILEGED);
  }
187
  else /* Hostname given means that the connection was on a socket */
unknown's avatar
unknown committed
188
  {
189
    DBUG_PRINT("general",("Host: %s",thd->host));
unknown's avatar
unknown committed
190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310
    thd->ip=0;
    bzero((char*) &thd->remote,sizeof(struct sockaddr));
  }
  vio_keepalive(net->vio, TRUE);

  /* nasty, but any other way? */
  uint pkt_len = 0;
  {
    char buff[60],*end;
    int client_flags = CLIENT_LONG_FLAG | CLIENT_CONNECT_WITH_DB |
	               CLIENT_TRANSACTIONS;
    LINT_INIT(pkt_len);

    end=strmov(buff,server_version)+1;
    int4store((uchar*) end,thd->thread_id);
    end+=4;
    memcpy(end,thd->scramble,SCRAMBLE_LENGTH+1);
    end+=SCRAMBLE_LENGTH +1;
#ifdef HAVE_COMPRESS
    client_flags |= CLIENT_COMPRESS;
#endif /* HAVE_COMPRESS */
#ifdef HAVE_OPENSSL
    if (ssl_acceptor_fd!=0)
      client_flags |= CLIENT_SSL;       /* Wow, SSL is avalaible! */
    /*
     * 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?
  */
#define  SSL_HANDSHAKE_SIZE      2
#define  NORMAL_HANDSHAKE_SIZE   6
#define  MIN_HANDSHAKE_SIZE      2

#else
#define  MIN_HANDSHAKE_SIZE      6
#endif /* HAVE_OPENSSL */
    int2store(end,client_flags);
    end[2]=MY_CHARSET_CURRENT;
    int2store(end+3,thd->server_status);
    bzero(end+5,13);
    end+=18;
    if (net_write_command(net,protocol_version, buff,
			  (uint) (end-buff)) ||
       (pkt_len=my_net_read(net)) == packet_error ||
	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);
  if (thd->packet.alloc(net_buffer_length))
    return(ER_OUT_OF_RESOURCES);

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

  thd->max_packet_length=uint3korr(net->read_pos+2);
  char *user=   (char*) net->read_pos+5;
  char *passwd= strend(user)+1;
  char *db=0;
  if (passwd[0] && strlen(passwd) != SCRAMBLE_LENGTH)
    return ER_HANDSHAKE_ERROR;
  if (thd->client_capabilities & CLIENT_CONNECT_WITH_DB)
    db=strend(passwd)+1;
  if (thd->client_capabilities & CLIENT_INTERACTIVE)
    thd->inactive_timeout=net_interactive_timeout;
  if (thd->client_capabilities & CLIENT_TRANSACTIONS)
    thd->net.return_status= &thd->server_status;
  net->timeout=net_read_timeout;
  if (check_user(thd,COM_CONNECT, user, passwd, db, 1))
    return (-1);
  thd->password=test(passwd[0]);
  return 0;
}


pthread_handler_decl(handle_one_connection,arg)
{
  THD *thd=(THD*) arg;
  uint launch_time  =
unknown's avatar
unknown committed
311
    (uint) ((thd->thr_create_time = time(NULL)) - thd->connect_time);
unknown's avatar
unknown committed
312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381
  if (launch_time >= slow_launch_time)
    statistic_increment(slow_launch_threads,&LOCK_status );

  pthread_detach_this_thread();

#ifndef __WIN__	/* Win32 calls this in pthread_create */
  if (my_thread_init()) // needed to be called first before we call
    // DBUG_ macros
  {
    close_connection(&thd->net,ER_OUT_OF_RESOURCES);
    statistic_increment(aborted_connects,&LOCK_thread_count);
    end_thread(thd,0);
    return 0;
  }
#endif

  // 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

  DBUG_PRINT("info", ("handle_one_connection called by thread %d\n",
		      thd->thread_id));
  // now that we've called my_thread_init(), it is safe to call DBUG_*

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

  do
  {
    int error;
    NET *net= &thd->net;

    thd->mysys_var=my_thread_var;
    thd->dbug_thread_id=my_thread_id();
    thd->thread_stack= (char*) &thd;

    if ((error=check_connections(thd)))
    {						// Wrong permissions
      if (error > 0)
	net_printf(net,error,thd->host ? thd->host : thd->ip);
#ifdef __NT__
      if (vio_type(net->vio) == VIO_TYPE_NAMEDPIPE)
	sleep(1);				/* must wait after eof() */
#endif
      statistic_increment(aborted_connects,&LOCK_thread_count);
      goto end_thread;
    }

    if (thd->max_join_size == HA_POS_ERROR)
      thd->options |= OPTION_BIG_SELECTS;
    if (thd->client_capabilities & CLIENT_COMPRESS)
      net->compress=1;				// Use compression
    if (thd->options & OPTION_ANSI_MODE)
      thd->client_capabilities|=CLIENT_IGNORE_SPACE;

unknown's avatar
unknown committed
382
    thd->proc_info=0;				// Remove 'login'
383
    thd->command=COM_SLEEP;
unknown's avatar
unknown committed
384 385
    thd->version=refresh_version;
    thd->set_time();
386
    init_sql_alloc(&thd->mem_root,8192,8192);
unknown's avatar
unknown committed
387 388 389 390 391
    while (!net->error && net->vio != 0 && !thd->killed)
    {
      if (do_command(thd))
	break;
    }
392
    free_root(&thd->mem_root,MYF(0));
unknown's avatar
unknown committed
393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425
    if (net->error && net->vio != 0)
    {
      sql_print_error(ER(ER_NEW_ABORTING_CONNECTION),
		      thd->thread_id,(thd->db ? thd->db : "unconnected"),
		      thd->user,
		      (thd->host ? thd->host : thd->ip ? thd->ip : "unknown"),
		      (net->last_errno ? ER(net->last_errno) :
		       ER(ER_UNKNOWN_ERROR)));
      send_error(net,net->last_errno,NullS);
      thread_safe_increment(aborted_threads,&LOCK_thread_count);
    }

end_thread:
    close_connection(net);
    end_thread(thd,1);
    /*
      If end_thread returns, we are either running with --one-thread
      or this thread has been schedule to handle the next query
    */
    thd= current_thd;
  } while (!(test_flags & TEST_NO_THREADS));
  /* The following is only executed if we are not using --one-thread */
  return(0);					/* purecov: deadcode */
}


int handle_bootstrap(THD *thd,FILE *file)
{
  DBUG_ENTER("handle_bootstrap");
  thd->thread_stack= (char*) &thd;

  if (init_thr_lock() ||
      my_pthread_setspecific_ptr(THR_THD,  thd) ||
unknown's avatar
unknown committed
426
      my_pthread_setspecific_ptr(THR_MALLOC, &thd->mem_root) ||
unknown's avatar
unknown committed
427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446
      my_pthread_setspecific_ptr(THR_NET,  &thd->net))
  {
    close_connection(&thd->net,ER_OUT_OF_RESOURCES);
    DBUG_RETURN(-1);
  }
  thd->mysys_var=my_thread_var;
  thd->dbug_thread_id=my_thread_id();
#ifndef __WIN__
  sigset_t set;
  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
#endif

  if (thd->max_join_size == (ulong) ~0L)
    thd->options |= OPTION_BIG_SELECTS;

  thd->proc_info=0;
  thd->version=refresh_version;

  char *buff= (char*) thd->net.buff;
447
  init_sql_alloc(&thd->mem_root,8192,8192);
unknown's avatar
unknown committed
448 449
  while (fgets(buff, thd->net.max_packet, file))
  {
unknown's avatar
unknown committed
450
    uint length=(uint) strlen(buff);
unknown's avatar
unknown committed
451 452 453 454
    while (length && (isspace(buff[length-1]) || buff[length-1] == ';'))
      length--;
    buff[length]=0;
    thd->current_tablenr=0;
unknown's avatar
unknown committed
455
    thd->query= thd->memdup(buff,length+1);
unknown's avatar
unknown committed
456 457 458 459 460 461 462
    thd->query_id=query_id++;
    mysql_parse(thd,thd->query,length);
    close_thread_tables(thd);			// Free tables
    if (thd->fatal_error)
    {
      DBUG_RETURN(-1);
    }
463
    free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
unknown's avatar
unknown committed
464
  }
465
  free_root(&thd->mem_root,MYF(0));
unknown's avatar
unknown committed
466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490
  DBUG_RETURN(0);
}


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

int mysql_table_dump(THD* thd, char* db, char* tbl_name, int fd)
{
  TABLE* table;
  TABLE_LIST* table_list;
  int error = 0;
  DBUG_ENTER("mysql_table_dump");
  db = (db && db[0]) ? db : thd->db;
  if(!(table_list = (TABLE_LIST*) sql_calloc(sizeof(TABLE_LIST))))
     DBUG_RETURN(1); // out of memory
  table_list->db = db;
  table_list->real_name = table_list->name = tbl_name;
  table_list->lock_type = TL_READ_NO_INSERT;
  table_list->next = 0;
  remove_escape(table_list->real_name);
unknown's avatar
unknown committed
491

unknown's avatar
unknown committed
492 493 494
  if(!(table=open_ltable(thd, table_list, TL_READ_NO_INSERT)))
    DBUG_RETURN(1);

495
  if (check_access(thd, SELECT_ACL, db, &table_list->grant.privilege))
unknown's avatar
unknown committed
496
    goto err;
497
  if (grant_option && check_grant(thd, SELECT_ACL, table_list))
unknown's avatar
unknown committed
498 499 500 501 502 503 504 505 506 507 508 509 510
    goto err;

  thd->free_list = 0;
  thd->query = tbl_name;
  if((error = mysqld_dump_create_info(thd, table, -1)))
    {
      my_error(ER_GET_ERRNO, MYF(0));
      goto err;
    }
  net_flush(&thd->net);
  error = table->file->dump(thd,fd);
  if(error)
      my_error(ER_GET_ERRNO, MYF(0));
unknown's avatar
unknown committed
511

unknown's avatar
unknown committed
512
err:
unknown's avatar
unknown committed
513

unknown's avatar
unknown committed
514
  close_thread_tables(thd);
unknown's avatar
unknown committed
515 516

  DBUG_RETURN(error);
unknown's avatar
unknown committed
517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551
}



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

bool do_command(THD *thd)
{
  char *packet;
  uint old_timeout,packet_length;
  bool	error=0;
  NET *net;
  enum enum_server_command command;
  DBUG_ENTER("do_command");

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

  packet=0;
  old_timeout=net->timeout;
  net->timeout=thd->inactive_timeout;		/* Wait max for 8 hours */
  net->last_error[0]=0;				// Clear error message
  net->last_errno=0;

  net_new_transaction(net);
  if ((packet_length=my_net_read(net)) == packet_error)
  {
     DBUG_PRINT("general",("Got error reading command from socket %s",
				vio_description(net->vio) ));
    return TRUE;
  }
  else
  {
    packet=(char*) net->read_pos;
    command = (enum enum_server_command) (uchar) packet[0];
552
    DBUG_PRINT("general",("Command on %s = %d (%s)",
unknown's avatar
unknown committed
553 554 555 556 557 558 559 560 561 562 563 564 565 566 567
			  vio_description(net->vio), command,
			  command_name[command]));
  }
  net->timeout=old_timeout;			/* Timeout */
  thd->command=command;
  VOID(pthread_mutex_lock(&LOCK_thread_count));
  thd->query_id=query_id;
  if (command != COM_STATISTICS && command != COM_PING)
    query_id++;
  thread_running++;
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
  thd->set_time();
  switch(command) {
  case COM_INIT_DB:
    if (!mysql_change_db(thd,packet+1))
568
      mysql_log.write(thd,command,"%s",thd->db);
unknown's avatar
unknown committed
569 570 571 572 573 574 575 576 577 578 579 580 581 582
    break;
  case COM_TABLE_DUMP:
    {
      char* data = packet + 1;
      uint db_len = *data;
      uint tbl_len = *(data + db_len + 1);
      char* db = sql_alloc(db_len + tbl_len + 2);
      memcpy(db, data + 1, db_len);
      char* tbl_name = db + db_len;
      *tbl_name++ = 0;
      memcpy(tbl_name, data + db_len + 2, tbl_len);
      tbl_name[tbl_len] = 0;
      if(mysql_table_dump(thd, db, tbl_name, -1))
	send_error(&thd->net); // dump to NET
unknown's avatar
unknown committed
583

unknown's avatar
unknown committed
584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630
      break;
    }
  case COM_CHANGE_USER:
  {
    char *user=   (char*) packet+1;
    char *passwd= strend(user)+1;
    char *db=     strend(passwd)+1;

    /* Save user and privileges */
    uint save_master_access=thd->master_access;
    uint save_db_access=    thd->db_access;
    char *save_user=	    thd->user;
    char *save_priv_user=   thd->priv_user;
    char *save_db=	    thd->db;

    if ((uint) ((uchar*) db - net->read_pos) > packet_length)
    {						// Check if protocol is ok
      send_error(net, ER_UNKNOWN_COM_ERROR);
      break;
    }
    if (check_user(thd, COM_CHANGE_USER, user, passwd, db,0))
    {						// Restore old user
      x_free(thd->user);
      x_free(thd->db);
      thd->master_access=save_master_access;
      thd->db_access=save_db_access;
      thd->db=save_db;
      thd->user=save_user;
      thd->priv_user=save_priv_user;
      break;
    }
    x_free((gptr) save_db);
    x_free((gptr) save_user);
    thd->password=test(passwd[0]);
    break;
  }

  case COM_QUERY:
  {
    char *pos=packet+packet_length;		// Point at end null
    /* Remove garage at end of query */
    while (packet_length > 0 && pos[-1] == ';')
    {
      pos--;
      packet_length--;
    }
    *pos=0;
unknown's avatar
unknown committed
631
    if (!(thd->query= (char*) thd->memdup((gptr) (packet+1),packet_length)))
unknown's avatar
unknown committed
632 633 634 635
      break;
    thd->packet.shrink(net_buffer_length);	// Reclaim some memory
    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),QUERY_PRIOR);
636
    mysql_log.write(thd,command,"%s",thd->query);
unknown's avatar
unknown committed
637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658
    DBUG_PRINT("query",("%s",thd->query));
    mysql_parse(thd,thd->query,packet_length-1);
    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),WAIT_PRIOR);
    DBUG_PRINT("info",("query ready"));
    break;
  }
  case COM_FIELD_LIST:				// This isn't actually neaded
#ifdef DONT_ALLOW_SHOW_COMMANDS
    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
    break;
#else
  {
    char *fields;
    TABLE_LIST table_list;
    bzero((char*) &table_list,sizeof(table_list));
    if (!(table_list.db=thd->db))
    {
      send_error(net,ER_NO_DB_ERROR);
      break;
    }
    thd->free_list=0;
unknown's avatar
unknown committed
659 660
    table_list.name=table_list.real_name=thd->strdup(packet+1);
    thd->query=fields=thd->strdup(strend(packet+1)+1);
661
    mysql_log.write(thd,command,"%s %s",table_list.real_name,fields);
unknown's avatar
unknown committed
662 663 664 665 666 667 668 669 670 671 672 673 674
    remove_escape(table_list.real_name);	// This can't have wildcards

    if (check_access(thd,SELECT_ACL,table_list.db,&thd->col_access))
      break;
    table_list.grant.privilege=thd->col_access;
    if (grant_option && check_grant(thd,SELECT_ACL,&table_list,2))
      break;
    mysqld_list_fields(thd,&table_list,fields);
    free_items(thd);
    break;
  }
#endif
  case COM_QUIT:
675
    mysql_log.write(thd,command,NullS);
unknown's avatar
unknown committed
676 677 678 679 680 681
    net->error=0;				// Don't give 'abort' message
    error=TRUE;					// End server
    break;

  case COM_CREATE_DB:
    {
unknown's avatar
unknown committed
682
      char *db=thd->strdup(packet+1);
unknown's avatar
unknown committed
683 684
      if (check_access(thd,CREATE_ACL,db,0,1))
	break;
685
      mysql_log.write(thd,command,packet+1);
unknown's avatar
unknown committed
686 687 688 689 690
      mysql_create_db(thd,db,0);
      break;
    }
  case COM_DROP_DB:
    {
unknown's avatar
unknown committed
691
      char *db=thd->strdup(packet+1);
unknown's avatar
unknown committed
692 693
      if (check_access(thd,DROP_ACL,db,0,1))
	break;
694
      mysql_log.write(thd,command,db);
unknown's avatar
unknown committed
695 696 697 698 699 700 701
      mysql_rm_db(thd,db,0);
      break;
    }
  case COM_BINLOG_DUMP:
    {
      if(check_access(thd, FILE_ACL, any_db))
	break;
702
      mysql_log.write(thd,command, 0);
unknown's avatar
unknown committed
703

unknown's avatar
unknown committed
704 705
      ulong pos;
      ushort flags;
706
      uint32 slave_server_id;
unknown's avatar
unknown committed
707 708
      pos = uint4korr(packet + 1);
      flags = uint2korr(packet + 5);
709 710 711 712 713
      pthread_mutex_lock(&LOCK_server_id);
      kill_zombie_dump_threads(slave_server_id = uint4korr(packet+7));
      thd->server_id = slave_server_id;
      pthread_mutex_unlock(&LOCK_server_id);
      mysql_binlog_send(thd, strdup(packet + 11), pos, flags);
714 715 716
      // fake COM_QUIT -- if we get here, the thread needs to terminate
      error = TRUE;
      net->error = 0;
unknown's avatar
unknown committed
717 718 719 720 721 722 723
      break;
    }
  case COM_REFRESH:
    {
      uint options=(uchar) packet[1];
      if (check_access(thd,RELOAD_ACL,any_db))
	break;
724
      mysql_log.write(thd,command,NullS);
unknown's avatar
unknown committed
725
      if (reload_acl_and_cache(thd, options, (TABLE_LIST*) 0))
unknown's avatar
unknown committed
726 727 728 729 730 731 732 733 734
	send_error(net,0);
      else
	send_eof(net);
      break;
    }
  case COM_SHUTDOWN:
    if (check_access(thd,SHUTDOWN_ACL,any_db))
      break; /* purecov: inspected */
    DBUG_PRINT("quit",("Got shutdown command"));
735
    mysql_log.write(thd,command,NullS);
unknown's avatar
unknown committed
736 737 738 739 740 741 742
    send_eof(net);
#ifdef __WIN__
    sleep(1);					// must wait after eof()
#endif
    send_eof(net);				// This is for 'quit request'
    close_connection(net);
    close_thread_tables(thd);			// Free before kill
743
    free_root(&thd->mem_root,MYF(0));
unknown's avatar
unknown committed
744 745 746 747 748 749
    kill_mysql();
    error=TRUE;
    break;

  case COM_STATISTICS:
  {
750
    mysql_log.write(thd,command,NullS);
unknown's avatar
unknown committed
751
    char buff[200];
752
    ulong uptime = (ulong) (thd->start_time - start_time);
unknown's avatar
unknown committed
753 754 755 756 757 758 759 760 761 762 763
    sprintf((char*) buff,
	    "Uptime: %ld  Threads: %d  Questions: %lu  Slow queries: %ld  Opens: %ld  Flush tables: %ld  Open tables: %d Queries per second avg: %.3f",
	    uptime,
	    (int) thread_count,thd->query_id,long_query_count,
	    opened_tables,refresh_version, cached_tables(),
	    uptime ? (float)thd->query_id/(float)uptime : 0);
#ifdef SAFEMALLOC
    if (lCurMemory)				// Using SAFEMALLOC
      sprintf(strend(buff), "  Memory in use: %ldK  Max memory used: %ldK",
	      (lCurMemory+1023L)/1024L,(lMaxMemory+1023L)/1024L);
 #endif
unknown's avatar
unknown committed
764
    VOID(my_net_write(net, buff,(uint) strlen(buff)));
unknown's avatar
unknown committed
765 766 767 768 769 770 771 772 773
    VOID(net_flush(net));
    break;
  }
  case COM_PING:
    send_ok(net);				// Tell client we are alive
    break;
  case COM_PROCESS_INFO:
    if (!thd->priv_user[0] && check_access(thd,PROCESS_ACL,any_db))
      break;
774
    mysql_log.write(thd,command,NullS);
unknown's avatar
unknown committed
775 776 777 778 779 780 781 782 783 784 785 786 787
    mysqld_list_processes(thd,thd->master_access & PROCESS_ACL ? NullS :
			  thd->priv_user,0);
    break;
  case COM_PROCESS_KILL:
  {
    ulong id=(ulong) uint4korr(packet+1);
    kill_one_thread(thd,id);
    break;
  }
  case COM_DEBUG:
    if (check_access(thd,PROCESS_ACL,any_db))
      break;					/* purecov: inspected */
    mysql_print_status(thd);
788
    mysql_log.write(thd,command,NullS);
unknown's avatar
unknown committed
789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810
    send_eof(net);
    break;
  case COM_SLEEP:
  case COM_CONNECT:				// Impossible here
  case COM_TIME:				// Impossible from client
  case COM_DELAYED_INSERT:
  default:
    send_error(net, ER_UNKNOWN_COM_ERROR);
    break;
  }
  if (thd->lock || thd->open_tables)
  {
    thd->proc_info="closing tables";
    close_thread_tables(thd);			/* Free tables */
  }
  thd->proc_info="cleaning up";

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

  time_t start_of_query=thd->start_time;
  thd->set_time();
811 812 813
  /* If not reading from backup and if the query took too long */
  if (!thd->user_time &&
      (ulong) (thd->start_time - start_of_query) > long_query_time)
unknown's avatar
unknown committed
814 815
  {
    long_query_count++;
816
    mysql_slow_log.write(thd, thd->query, thd->query_length, start_of_query);
unknown's avatar
unknown committed
817 818 819 820 821 822 823 824
  }
  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For process list
  thd->proc_info=0;
  thd->command=COM_SLEEP;
  thd->query=0;
  thread_running--;
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
  thd->packet.shrink(net_buffer_length);	// Reclaim some memory
825
  free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
unknown's avatar
unknown committed
826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926
  DBUG_RETURN(error);
}

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

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

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

    thd->offset_limit=lex->offset_limit;
    thd->select_limit=lex->select_limit+lex->offset_limit;
    if (thd->select_limit < lex->select_limit)
      thd->select_limit= HA_POS_ERROR;		// no limit

    if (lex->exchange)
    {
      if (lex->exchange->dumpfile)
      {
	if (!(result=new select_dump(lex->exchange)))
	{
	  res= -1;
	  break;
	}
      }
      else
      {
	if (!(result=new select_export(lex->exchange)))
	{
	  res= -1;
	  break;
	}
      }
    }
    else if (!(result=new select_send()))
    {
      res= -1;
#ifdef DELETE_ITEMS
      delete lex->having;
      delete lex->where;
#endif
      break;
    }

    if (lex->options & SELECT_HIGH_PRIORITY)
    {
      TABLE_LIST *table;
      for (table = tables ; table ; table=table->next)
	table->lock_type=TL_READ_HIGH_PRIORITY;
    }

    if (!(res=open_and_lock_tables(thd,tables)))
    {
      res=mysql_select(thd,tables,lex->item_list,
		       lex->where,
                       lex->ftfunc_list,
		       (ORDER*) lex->order_list.first,
		       (ORDER*) lex->group_list.first,
		       lex->having,
		       (ORDER*) lex->proc_list.first,
		       lex->options | thd->options,
		       result);
      if (res)
	result->abort();
    }
    delete result;
#ifdef DELETE_ITEMS
    delete lex->having;
    delete lex->where;
#endif
    break;
  }
unknown's avatar
unknown committed
927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945
  case SQLCOM_BACKUP_TABLE:
    {
      if (check_db_used(thd,tables) ||
	  check_table_access(thd,SELECT_ACL, tables) ||
	  check_access(thd, FILE_ACL, any_db))
	goto error; /* purecov: inspected */
      res = mysql_backup_table(thd, tables);

      break;
    }
  case SQLCOM_RESTORE_TABLE:
    {
      if (check_db_used(thd,tables) ||
	  check_table_access(thd,INSERT_ACL, tables) ||
	  check_access(thd, FILE_ACL, any_db))
	goto error; /* purecov: inspected */
      res = mysql_restore_table(thd, tables);
      break;
    }
unknown's avatar
unknown committed
946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961
  case SQLCOM_CHANGE_MASTER:
    {
      if(check_access(thd, PROCESS_ACL, any_db))
	goto error;
      res = change_master(thd);
      break;
    }
  case SQLCOM_SHOW_SLAVE_STAT:
    {
      if(check_access(thd, PROCESS_ACL, any_db))
	goto error;
      res = show_master_info(thd);
      break;
    }
  case SQLCOM_SHOW_MASTER_STAT:
    {
unknown's avatar
unknown committed
962
      if (check_access(thd, PROCESS_ACL, any_db))
unknown's avatar
unknown committed
963 964 965 966 967
	goto error;
      res = show_binlog_info(thd);
      break;
    }
  case SQLCOM_LOAD_MASTER_TABLE:
unknown's avatar
unknown committed
968

unknown's avatar
unknown committed
969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000
    if (!tables->db)
      tables->db=thd->db;
    if (check_access(thd,CREATE_ACL,tables->db,&tables->grant.privilege))
      goto error;				/* purecov: inspected */
    if (grant_option)
    {
      /* Check that the first table has CREATE privilege */
      TABLE_LIST *tmp_table_list=tables->next;
      tables->next=0;
      bool error=check_grant(thd,CREATE_ACL,tables);
      tables->next=tmp_table_list;
      if (error)
	  goto error;
    }
    if (strlen(tables->name) > NAME_LEN)
    {
      net_printf(&thd->net,ER_WRONG_TABLE_NAME,tables->name);
      res=0;
      break;
    }

    thd->last_nx_table = tables->real_name;
    thd->last_nx_db = tables->db;
    if(fetch_nx_table(thd, &glob_mi))
      // fetch_nx_table is responsible for sending
      // the error
      {
	res = 0;
	thd->net.no_send_ok = 0; // easier to do it here
	// this way we make sure that when we are done, we are clean
        break;
      }
unknown's avatar
unknown committed
1001

unknown's avatar
unknown committed
1002 1003 1004
    res = 0;
    send_ok(&thd->net);
    break;
unknown's avatar
unknown committed
1005

unknown's avatar
unknown committed
1006
  case SQLCOM_CREATE_TABLE:
1007 1008 1009 1010 1011 1012
    if (!tables->db)
      tables->db=thd->db;
    if (check_access(thd,CREATE_ACL,tables->db,&tables->grant.privilege) ||
	check_merge_table_access(thd, tables->db,
				 (TABLE_LIST *)
				 lex->create_info.merge_list.first))
unknown's avatar
unknown committed
1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100
      goto error;				/* purecov: inspected */
    if (grant_option)
    {
      /* Check that the first table has CREATE privilege */
      TABLE_LIST *tmp_table_list=tables->next;
      tables->next=0;
      bool error=check_grant(thd,CREATE_ACL,tables);
      tables->next=tmp_table_list;
      if (error)
	goto error;
    }
    if (strlen(tables->name) > NAME_LEN)
    {
      net_printf(&thd->net,ER_WRONG_TABLE_NAME,tables->name);
      res=0;
      break;
    }
    if (lex->item_list.elements)		// With select
    {
      select_result *result;

      if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
	  check_dup(thd,tables->db,tables->real_name,tables->next))
      {
	net_printf(&thd->net,ER_INSERT_TABLE_USED,tables->real_name);
	DBUG_VOID_RETURN;
      }
      if (tables->next)
      {
	if (check_table_access(thd, SELECT_ACL, tables->next))
	  goto error;				// Error message is given
      }
      thd->offset_limit=lex->offset_limit;
      thd->select_limit=lex->select_limit+lex->offset_limit;
      if (thd->select_limit < lex->select_limit)
	thd->select_limit= HA_POS_ERROR;		// No limit

      if (!(res=open_and_lock_tables(thd,tables->next)))
      {
	if ((result=new select_create(tables->db ? tables->db : thd->db,
				      tables->real_name, &lex->create_info,
				      lex->create_list,
				      lex->key_list,
				      lex->item_list,lex->duplicates)))
	{
	  res=mysql_select(thd,tables->next,lex->item_list,
			   lex->where,
                           lex->ftfunc_list,
			   (ORDER*) lex->order_list.first,
			   (ORDER*) lex->group_list.first,
			   lex->having,
			   (ORDER*) lex->proc_list.first,
			   lex->options | thd->options,
			   result);
	  if (res)
	    result->abort();
	  delete result;
	}
	else
	  res= -1;
      }
    }
    else // regular create
    {
      res = mysql_create_table(thd,tables->db ? tables->db : thd->db,
			       tables->real_name, &lex->create_info,
			       lex->create_list,
			       lex->key_list,0, 0); // do logging
      if (!res)
	send_ok(&thd->net);
    }
    break;
  case SQLCOM_CREATE_INDEX:
    if (!tables->db)
      tables->db=thd->db;
    if (check_access(thd,INDEX_ACL,tables->db,&tables->grant.privilege))
      goto error; /* purecov: inspected */
    if (grant_option && check_grant(thd,INDEX_ACL,tables))
      goto error;
    res = mysql_create_index(thd, tables, lex->key_list);
    break;

  case SQLCOM_SLAVE_START:
    start_slave(thd);
    break;
  case SQLCOM_SLAVE_STOP:
    stop_slave(thd);
    break;
unknown's avatar
unknown committed
1101

unknown's avatar
unknown committed
1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114
  case SQLCOM_ALTER_TABLE:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
    break;
#else
    {
      uint priv=0;
      if (lex->name && strlen(lex->name) > NAME_LEN)
      {
	net_printf(&thd->net,ER_WRONG_TABLE_NAME,lex->name);
	res=0;
	break;
      }
1115 1116
      if (!tables->db)
	tables->db=thd->db;
unknown's avatar
unknown committed
1117 1118 1119
      if (!lex->db)
	lex->db=tables->db;
      if (check_access(thd,ALTER_ACL,tables->db,&tables->grant.privilege) ||
1120 1121 1122 1123 1124
	  check_access(thd,INSERT_ACL | CREATE_ACL,lex->db,&priv) ||
	  check_merge_table_access(thd, tables->db, 
				   (TABLE_LIST *)
				   lex->create_info.merge_list.first))
	goto error;				/* purecov: inspected */
unknown's avatar
unknown committed
1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153
      if (!tables->db)
	tables->db=thd->db;
      if (grant_option)
      {
	if (check_grant(thd,ALTER_ACL,tables))
	  goto error;
	if (lex->name && !test_all_bits(priv,INSERT_ACL | CREATE_ACL))
	{					// Rename of table
	  TABLE_LIST tmp_table;
	  bzero((char*) &tmp_table,sizeof(tmp_table));
	  tmp_table.real_name=lex->name;
	  tmp_table.db=lex->db;
	  tmp_table.grant.privilege=priv;
	  if (check_grant(thd,INSERT_ACL | CREATE_ACL,tables))
	    goto error;
	}
      }
      /* ALTER TABLE ends previous transaction */
      if (!(thd->options & OPTION_AUTO_COMMIT) && ha_commit(thd))
	res= -1;
      else
	res= mysql_alter_table(thd, lex->db, lex->name,
			       &lex->create_info,
			       tables, lex->create_list,
			       lex->key_list, lex->drop_list, lex->alter_list,
			       lex->drop_primary, lex->duplicates);
      break;
    }
#endif
unknown's avatar
unknown committed
1154
  case SQLCOM_RENAME_TABLE:
unknown's avatar
unknown committed
1155 1156 1157
  {
    TABLE_LIST *table;
    if (check_db_used(thd,tables))
unknown's avatar
unknown committed
1158
      goto error;
unknown's avatar
unknown committed
1159 1160
    for (table=tables ; table ; table=table->next->next)
    {
unknown's avatar
unknown committed
1161 1162
      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
		       &table->grant.privilege) ||
unknown's avatar
unknown committed
1163 1164 1165 1166 1167
	  check_access(thd, INSERT_ACL | CREATE_ACL, table->next->db,
		       &table->next->grant.privilege))
	goto error;
      if (grant_option)
      {
unknown's avatar
unknown committed
1168 1169 1170 1171 1172
	TABLE_LIST old_list,new_list;
	old_list=table[0];
	new_list=table->next[0];
	old_list.next=new_list.next=0;
	if (check_grant(thd,ALTER_ACL,&old_list) ||
unknown's avatar
unknown committed
1173 1174
	    (!test_all_bits(table->next->grant.privilege,
			   INSERT_ACL | CREATE_ACL) &&
unknown's avatar
unknown committed
1175
	     check_grant(thd,INSERT_ACL | CREATE_ACL, &new_list)))
unknown's avatar
unknown committed
1176 1177 1178
	  goto error;
      }
    }
unknown's avatar
unknown committed
1179 1180 1181
    if (mysql_rename_tables(thd,tables))
      res= -1;
    break;
unknown's avatar
unknown committed
1182
  }
unknown's avatar
unknown committed
1183
  case SQLCOM_SHOW_CREATE:
unknown's avatar
unknown committed
1184
#ifdef DONT_ALLOW_SHOW_COMMANDS
unknown's avatar
unknown committed
1185
    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
unknown's avatar
unknown committed
1186 1187
    DBUG_VOID_RETURN;
#else
unknown's avatar
unknown committed
1188
    {
unknown's avatar
unknown committed
1189 1190 1191 1192
      if (check_db_used(thd, tables) ||
	  check_access(thd, SELECT_ACL | EXTRA_ACL, tables->db,
		       &tables->grant.privilege))
	goto error;
unknown's avatar
unknown committed
1193
      res = mysqld_show_create(thd, tables);
unknown's avatar
unknown committed
1194 1195
      break;
    }
unknown's avatar
unknown committed
1196
#endif
unknown's avatar
unknown committed
1197 1198
  case SQLCOM_REPAIR:
    {
unknown's avatar
unknown committed
1199 1200
      if (check_db_used(thd,tables) ||
	  check_table_access(thd,SELECT_ACL | INSERT_ACL, tables))
unknown's avatar
unknown committed
1201
	goto error; /* purecov: inspected */
unknown's avatar
unknown committed
1202 1203 1204 1205 1206
      res = mysql_repair_table(thd, tables, &lex->check_opt);
      break;
    }
  case SQLCOM_CHECK:
    {
unknown's avatar
unknown committed
1207 1208 1209
      if (check_db_used(thd,tables) ||
	  check_table_access(thd, SELECT_ACL | EXTRA_ACL , tables))
	goto error; /* purecov: inspected */
unknown's avatar
unknown committed
1210 1211 1212 1213 1214
      res = mysql_check_table(thd, tables, &lex->check_opt);
      break;
    }
  case SQLCOM_ANALYZE:
  {
unknown's avatar
unknown committed
1215 1216
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables))
unknown's avatar
unknown committed
1217
      goto error; /* purecov: inspected */
1218
    res = mysql_analyze_table(thd, tables, &lex->check_opt);
unknown's avatar
unknown committed
1219
    break;
unknown's avatar
unknown committed
1220
  }
1221

unknown's avatar
unknown committed
1222 1223 1224
  case SQLCOM_OPTIMIZE:
  {
    HA_CREATE_INFO create_info;
1225 1226
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables))
unknown's avatar
unknown committed
1227
      goto error; /* purecov: inspected */
1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245
    if (specialflag & (SPECIAL_SAFE_MODE | SPECIAL_NO_NEW_FUNC))
    {
      /* Use ALTER TABLE */
      lex->create_list.empty();
      lex->key_list.empty();
      lex->col_list.empty();
      lex->drop_list.empty();
      lex->alter_list.empty();
      bzero((char*) &create_info,sizeof(create_info));
      create_info.db_type=DB_TYPE_DEFAULT;
      create_info.row_type=ROW_TYPE_DEFAULT;
      res= mysql_alter_table(thd, NullS, NullS, &create_info,
			     tables, lex->create_list,
			     lex->key_list, lex->drop_list, lex->alter_list,
			     0,DUP_ERROR);
    }
    else
      res = mysql_optimize_table(thd, tables, &lex->check_opt);
unknown's avatar
unknown committed
1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354
    break;
  }
  case SQLCOM_UPDATE:
    if (check_access(thd,UPDATE_ACL,tables->db,&tables->grant.privilege))
      goto error;
    if (grant_option && check_grant(thd,UPDATE_ACL,tables))
      goto error;
    if (lex->item_list.elements != lex->value_list.elements)
    {
      send_error(&thd->net,ER_WRONG_VALUE_COUNT);
      DBUG_VOID_RETURN;
    }
    res = mysql_update(thd,tables,
		       lex->item_list,
		       lex->value_list,
		       lex->where,
		       lex->select_limit,
		       lex->duplicates,
		       lex->lock_option);

#ifdef DELETE_ITEMS
    delete lex->where;
#endif
    break;
  case SQLCOM_INSERT:
    if (check_access(thd,INSERT_ACL,tables->db,&tables->grant.privilege))
      goto error; /* purecov: inspected */
    if (grant_option && check_grant(thd,INSERT_ACL,tables))
      goto error;
    res = mysql_insert(thd,tables,lex->field_list,lex->many_values,
		       lex->duplicates,
		       lex->lock_option);
    break;
  case SQLCOM_REPLACE:
    if (check_access(thd,INSERT_ACL | UPDATE_ACL | DELETE_ACL,
		     tables->db,&tables->grant.privilege))
      goto error; /* purecov: inspected */
    if (grant_option && check_grant(thd,INSERT_ACL | UPDATE_ACL | DELETE_ACL,
				    tables))

      goto error;
    res = mysql_insert(thd,tables,lex->field_list,lex->many_values,
		       DUP_REPLACE,
		       lex->lock_option);
    break;
  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
    // Check that we have modify privileges for the first table and
    // select privileges for the rest
    uint privilege= (lex->sql_command == SQLCOM_INSERT_SELECT ?
		     INSERT_ACL : INSERT_ACL | UPDATE_ACL | DELETE_ACL);
    TABLE_LIST *save_next=tables->next;
    tables->next=0;
    if (check_access(thd, privilege,
		     tables->db,&tables->grant.privilege) ||
	(grant_option && check_grant(thd, privilege, tables)))
      goto error;
    tables->next=save_next;
    if ((res=check_table_access(thd, SELECT_ACL, save_next)))
      goto error;

    select_result *result;
    thd->offset_limit=lex->offset_limit;
    thd->select_limit=lex->select_limit+lex->offset_limit;
    if (thd->select_limit < lex->select_limit)
      thd->select_limit= HA_POS_ERROR;		// No limit

    if (check_dup(thd,tables->db,tables->real_name,tables->next))
    {
      net_printf(&thd->net,ER_INSERT_TABLE_USED,tables->real_name);
      DBUG_VOID_RETURN;
    }
    tables->lock_type=TL_WRITE;				// update first table
    if (!(res=open_and_lock_tables(thd,tables)))
    {
      if ((result=new select_insert(tables->table,&lex->field_list,
				    lex->sql_command == SQLCOM_REPLACE_SELECT ?
				    DUP_REPLACE : DUP_IGNORE)))
      {
	res=mysql_select(thd,tables->next,lex->item_list,
			 lex->where,
                         lex->ftfunc_list,
			 (ORDER*) lex->order_list.first,
			 (ORDER*) lex->group_list.first,
			 lex->having,
			 (ORDER*) lex->proc_list.first,
			 lex->options | thd->options,
			 result);
	delete result;
      }
      else
	res= -1;
    }
#ifdef DELETE_ITEMS
    delete lex->having;
    delete lex->where;
#endif
    break;
  }
  case SQLCOM_DELETE:
  {
    if (check_access(thd,DELETE_ACL,tables->db,&tables->grant.privilege))
      goto error; /* purecov: inspected */
    if (grant_option && check_grant(thd,DELETE_ACL,tables))
      goto error;
    // Set privilege for the WHERE clause
    tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
    res = mysql_delete(thd,tables,lex->where,lex->select_limit,
1355
		       lex->lock_option, lex->options);
unknown's avatar
unknown committed
1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377
#ifdef DELETE_ITEMS
    delete lex->where;
#endif
    break;
  }
  case SQLCOM_DROP_TABLE:
    {
      if (check_table_access(thd,DROP_ACL,tables))
	goto error;				/* purecov: inspected */
      res = mysql_rm_table(thd,tables,lex->drop_if_exists);
    }
    break;
  case SQLCOM_DROP_INDEX:
    if (!tables->db)
      tables->db=thd->db;
    if (check_access(thd,INDEX_ACL,tables->db,&tables->grant.privilege))
      goto error;				/* purecov: inspected */
    if (grant_option && check_grant(thd,INDEX_ACL,tables))
      goto error;
    res = mysql_drop_index(thd, tables, lex->drop_list);
    break;
  case SQLCOM_SHOW_DATABASES:
1378
#if defined(DONT_ALLOW_SHOW_COMMANDS)
unknown's avatar
unknown committed
1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519
    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
    DBUG_VOID_RETURN;
#else
    if ((specialflag & SPECIAL_SKIP_SHOW_DB) &&
	check_access(thd,PROCESS_ACL,any_db))
      goto error;
    res= mysqld_show_dbs(thd, (lex->wild ? lex->wild->ptr() : NullS));
    break;
#endif
  case SQLCOM_SHOW_PROCESSLIST:
    if (!thd->priv_user[0] && check_access(thd,PROCESS_ACL,any_db))
      break;
    mysqld_list_processes(thd,thd->master_access & PROCESS_ACL ? NullS :
			  thd->priv_user,lex->verbose);
    break;
  case SQLCOM_SHOW_STATUS:
    res= mysqld_show(thd,(lex->wild ? lex->wild->ptr() : NullS),status_vars);
    break;
  case SQLCOM_SHOW_VARIABLES:
    res= mysqld_show(thd, (lex->wild ? lex->wild->ptr() : NullS),
		     init_vars);
    break;
  case SQLCOM_SHOW_TABLES:
#ifdef DONT_ALLOW_SHOW_COMMANDS
    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
    DBUG_VOID_RETURN;
#else
    {
      char *db=lex->db ? lex->db : thd->db;
      if (!db)
      {
	send_error(&thd->net,ER_NO_DB_ERROR);	/* purecov: inspected */
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);				// Fix escaped '_'
      if (strlen(db) > NAME_LEN)
      {
	net_printf(&thd->net,ER_WRONG_DB_NAME, db);
	goto error;
      }
      if (check_access(thd,SELECT_ACL,db,&thd->col_access))
	goto error;				/* purecov: inspected */
      /* grant is checked in mysqld_show_tables */
      if (lex->options & SELECT_DESCRIBE)
      res= mysqld_extend_show_tables(thd,db,
				     (lex->wild ? lex->wild->ptr() : NullS));
      else
	res= mysqld_show_tables(thd,db,
				(lex->wild ? lex->wild->ptr() : NullS));
      break;
    }
#endif
  case SQLCOM_SHOW_FIELDS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
    DBUG_VOID_RETURN;
#else
    {
      char *db=tables->db ? tables->db : thd->db;
      if (!db)
      {
	send_error(&thd->net,ER_NO_DB_ERROR);	/* purecov: inspected */
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);			// Fix escaped '_'
      remove_escape(tables->name);
      if (!tables->db)
	tables->db=thd->db;
      if (check_access(thd,SELECT_ACL | EXTRA_ACL,db,&thd->col_access))
	goto error;				/* purecov: inspected */
      tables->grant.privilege=thd->col_access;
      if (grant_option && check_grant(thd,SELECT_ACL,tables,2))
	goto error;
      res= mysqld_show_fields(thd,tables,
			      (lex->wild ? lex->wild->ptr() : NullS));
      break;
    }
#endif
  case SQLCOM_SHOW_KEYS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
    send_error(&thd->net,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
    DBUG_VOID_RETURN;
#else
    {
      char *db=tables->db ? tables->db : thd->db;
      if (!db)
      {
	send_error(&thd->net,ER_NO_DB_ERROR);	/* purecov: inspected */
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);			// Fix escaped '_'
      remove_escape(tables->name);
      if (!tables->db)
	tables->db=thd->db;
      if (check_access(thd,SELECT_ACL,db,&thd->col_access))
	goto error; /* purecov: inspected */
      tables->grant.privilege=thd->col_access;
      if (grant_option && check_grant(thd,SELECT_ACL,tables,2))
	goto error;
      res= mysqld_show_keys(thd,tables);
      break;
    }
#endif
  case SQLCOM_CHANGE_DB:
    mysql_change_db(thd,lex->db);
    break;
  case SQLCOM_LOAD:
  {
    uint privilege= (lex->duplicates == DUP_REPLACE ?
		     INSERT_ACL | UPDATE_ACL | DELETE_ACL : INSERT_ACL);
    if (!(lex->local_file && (thd->client_capabilities & CLIENT_LOCAL_FILES)))
    {
      if (check_access(thd,privilege | FILE_ACL,tables->db))
	goto error;
    }
    else
    {
      if (check_access(thd,privilege,tables->db,&tables->grant.privilege) ||
	 grant_option && check_grant(thd,privilege,tables))
	goto error;
    }
    res=mysql_load(thd, lex->exchange, tables, lex->field_list,
		   lex->duplicates, (bool) lex->local_file, lex->lock_option);
    break;
  }
  case SQLCOM_SET_OPTION:
  {
    uint org_options=thd->options;
    thd->options=lex->options;
    thd->update_lock_default= ((thd->options & OPTION_LOW_PRIORITY_UPDATES) ?
			       TL_WRITE_LOW_PRIORITY : TL_WRITE);
    thd->default_select_limit=lex->select_limit;
    DBUG_PRINT("info",("options: %ld  limit: %ld",
		       thd->options,(long) thd->default_select_limit));

    /* Check if auto_commit mode changed */
    if ((org_options ^ lex->options) & OPTION_AUTO_COMMIT)
    {
      if (org_options & OPTION_AUTO_COMMIT)
      {
	/* We changed to auto_commit mode */
unknown's avatar
unknown committed
1520
	thd->options&= ~OPTION_BEGIN;
unknown's avatar
unknown committed
1521 1522 1523 1524 1525 1526 1527 1528
	thd->server_status|= SERVER_STATUS_AUTOCOMMIT;
	if (ha_commit(thd))
	{
	  res= -1;
	  break;
	}
      }
      else
unknown's avatar
unknown committed
1529
	thd->server_status&= ~SERVER_STATUS_AUTOCOMMIT;
unknown's avatar
unknown committed
1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556
    }
    send_ok(&thd->net);
    break;
  }
  case SQLCOM_UNLOCK_TABLES:
    if (thd->locked_tables)
    {
      thd->lock=thd->locked_tables;
      thd->locked_tables=0;			// Will be automaticly closed
    }
    if (thd->global_read_lock)
    {
      thd->global_read_lock=0;
      pthread_mutex_lock(&LOCK_open);
      global_read_lock--;
      pthread_cond_broadcast(&COND_refresh);
      pthread_mutex_unlock(&LOCK_open);
    }
    send_ok(&thd->net);
    break;
  case SQLCOM_LOCK_TABLES:
    if (thd->locked_tables)
    {
      thd->lock=thd->locked_tables;
      thd->locked_tables=0;			// Will be automaticly closed
      close_thread_tables(thd);
    }
unknown's avatar
unknown committed
1557
    if (check_db_used(thd,tables))
unknown's avatar
unknown committed
1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615
      goto error;
    thd->in_lock_tables=1;
    if (!(res=open_and_lock_tables(thd,tables)))
    {
      thd->locked_tables=thd->lock;
      thd->lock=0;
      send_ok(&thd->net);
    }
    thd->in_lock_tables=0;
    break;
  case SQLCOM_CREATE_DB:
    {
      if (check_access(thd,CREATE_ACL,lex->name,0,1))
	break;
      mysql_create_db(thd,lex->name,lex->create_info.options);
      break;
    }
  case SQLCOM_DROP_DB:
    {
      if (check_access(thd,DROP_ACL,lex->name,0,1))
	break;
      mysql_rm_db(thd,lex->name,lex->drop_if_exists);
      break;
    }
  case SQLCOM_CREATE_FUNCTION:
    if (check_access(thd,INSERT_ACL,"mysql",0,1))
      break;
#ifdef HAVE_DLOPEN
    if (!(res = mysql_create_function(thd,&lex->udf)))
      send_ok(&thd->net);
#else
    res= -1;
#endif
    break;
  case SQLCOM_DROP_FUNCTION:
    if (check_access(thd,DELETE_ACL,"mysql",0,1))
      break;
#ifdef HAVE_DLOPEN
    if (!(res = mysql_drop_function(thd,lex->udf.name)))
      send_ok(&thd->net);
#else
    res= -1;
#endif
    break;
 case SQLCOM_REVOKE:
 case SQLCOM_GRANT:
   {
     if (tables && !tables->db)
       tables->db=thd->db;
     if (check_access(thd, lex->grant | lex->grant_tot_col | GRANT_ACL,
		      tables && tables->db ? tables->db : lex->db,
		      tables ? &tables->grant.privilege : 0,
		      tables ? 0 : 1))
       goto error;

     /* Check that the user isn't trying to change a password for another
	user if he doesn't have UPDATE privilege to the MySQL database */

1616 1617 1618 1619
     if (thd->user)				// If not replication
     {
       LEX_USER *user;
       List_iterator <LEX_USER> user_list(lex->users_list);
unknown's avatar
unknown committed
1620
       while ((user=user_list++))
1621 1622 1623 1624 1625
       {
	 if (user->password.str &&
	     (strcmp(thd->user,user->user.str) ||
	      user->host.str &&
	      my_strcasecmp(user->host.str, thd->host ? thd->host : thd->ip)))
unknown's avatar
unknown committed
1626
	 {
1627 1628 1629
	   if (check_access(thd, UPDATE_ACL, "mysql",0,1))
	     goto error;
	   break;			// We are allowed to do changes
unknown's avatar
unknown committed
1630
	 }
1631 1632
       }
     }
unknown's avatar
unknown committed
1633 1634 1635 1636 1637 1638 1639 1640 1641 1642
     if (tables)
     {
       if (grant_option && check_grant(thd,
				       (lex->grant | lex->grant_tot_col |
					GRANT_ACL),
				       tables))
	 goto error;
       res = mysql_table_grant(thd,tables,lex->users_list, lex->columns,
			       lex->grant, lex->sql_command == SQLCOM_REVOKE);
       if(!res)
1643 1644 1645
       {
	 mysql_update_log.write(thd, thd->query,thd->query_length);
	 if (mysql_bin_log.is_open())
unknown's avatar
unknown committed
1646
	 {
1647 1648
	   Query_log_event qinfo(thd, thd->query);
	   mysql_bin_log.write(&qinfo);
unknown's avatar
unknown committed
1649
	 }
1650
       }
unknown's avatar
unknown committed
1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662
     }
     else
     {
       if (lex->columns.elements)
       {
	 net_printf(&thd->net,ER_ILLEGAL_GRANT_FOR_TABLE);
	 res=1;
       }
       else
	 res = mysql_grant(thd, lex->db, lex->users_list, lex->grant,
			   lex->sql_command == SQLCOM_REVOKE);
       if(!res)
1663
       {
1664 1665 1666 1667 1668 1669
	 mysql_update_log.write(thd, thd->query,thd->query_length);
	 if (mysql_bin_log.is_open())
	 {
	   Query_log_event qinfo(thd, thd->query);
	   mysql_bin_log.write(&qinfo);
	 }
1670
       }
unknown's avatar
unknown committed
1671 1672 1673 1674
     }
     break;
   }
  case SQLCOM_FLUSH:
unknown's avatar
unknown committed
1675
    if (check_access(thd,RELOAD_ACL,any_db) || check_db_used(thd, tables))
unknown's avatar
unknown committed
1676
      goto error;
unknown's avatar
unknown committed
1677
    if (reload_acl_and_cache(thd, lex->type, tables))
unknown's avatar
unknown committed
1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729
      send_error(&thd->net,0);
    else
      send_ok(&thd->net);
    break;
  case SQLCOM_KILL:
    kill_one_thread(thd,lex->thread_id);
    break;
  case SQLCOM_SHOW_GRANTS:
    res=0;
    if ((thd->user && !strcmp(thd->user,lex->grant_user->user.str)) ||
	!(check_access(thd, SELECT_ACL, "mysql")))
    {
      res = mysql_show_grants(thd,lex->grant_user);
    }
    break;
  case SQLCOM_BEGIN:
    thd->options|= OPTION_BEGIN;
    thd->server_status|= SERVER_STATUS_IN_TRANS;
    break;
  case SQLCOM_COMMIT:
    thd->options&= ~OPTION_BEGIN;
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    if (!ha_commit(thd))
      send_ok(&thd->net);
    else
      res= -1;
    break;
  case SQLCOM_ROLLBACK:
    thd->options&= ~OPTION_BEGIN;
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    if (!ha_rollback(thd))
      send_ok(&thd->net);
    else
      res= -1;
    break;
  default:					/* Impossible */
    send_ok(&thd->net);
    break;
  }
  thd->proc_info="query end";			// QQ
  if (res < 0)
    send_error(&thd->net,thd->killed ? ER_SERVER_SHUTDOWN : 0);

error:
  DBUG_VOID_RETURN;
}


/****************************************************************************
** Get the user (global) and database privileges for all used tables
** Returns true (error) if we can't get the privileges and we don't use
** table/column grants.
unknown's avatar
unknown committed
1730 1731 1732 1733
** 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.
unknown's avatar
unknown committed
1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798
****************************************************************************/

bool
check_access(THD *thd,uint want_access,const char *db, uint *save_priv,
	     bool no_grant)
{
  uint db_access,dummy;
  if (save_priv)
    *save_priv=0;
  else
    save_priv= &dummy;

  if (!db && !thd->db && !no_grant)
  {
    send_error(&thd->net,ER_NO_DB_ERROR);	/* purecov: tested */
    return TRUE;				/* purecov: tested */
  }

  if ((thd->master_access & want_access) == want_access)
  {
    *save_priv=thd->master_access;
    return FALSE;
  }
  if ((want_access & ~thd->master_access) & ~(DB_ACLS | EXTRA_ACL) ||
      ! db && no_grant)
  {						// We can never grant this
    net_printf(&thd->net,ER_ACCESS_DENIED_ERROR,
	       thd->priv_user,
	       thd->host ? thd->host : (thd->ip ? thd->ip : "unknown"),
	       thd->password ? ER(ER_YES) : ER(ER_NO));/* purecov: tested */
    return TRUE;				/* purecov: tested */
  }

  if (db == any_db)
    return FALSE;				// Allow select on anything
  if (db && (!thd->db || strcmp(db,thd->db)))
    db_access=acl_get(thd->host, thd->ip, (char*) &thd->remote.sin_addr,
		      thd->priv_user, db); /* purecov: inspected */
  else
    db_access=thd->db_access;
  want_access &= ~EXTRA_ACL;			// Remove SHOW attribute
  db_access= ((*save_priv=(db_access | thd->master_access)) & want_access);
  if (db_access == want_access ||
      ((grant_option && !no_grant) && !(want_access & ~TABLE_ACLS)))
    return FALSE;				/* Ok */
  net_printf(&thd->net,ER_DBACCESS_DENIED_ERROR,
	     thd->priv_user,
	     thd->host ? thd->host : (thd->ip ? thd->ip : "unknown"),
	     db ? db : thd->db ? thd->db : "unknown"); /* purecov: tested */
  return TRUE;					/* purecov: tested */
}


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

static bool
check_table_access(THD *thd,uint want_access,TABLE_LIST *tables)
{
  uint found=0,found_access=0;
  TABLE_LIST *org_tables=tables;
  for (; tables ; tables=tables->next)
  {
unknown's avatar
unknown committed
1799 1800
    if ((thd->master_access & want_access) == (want_access & ~EXTRA_ACL) &&
	thd->db)
unknown's avatar
unknown committed
1801
      tables->grant.privilege= want_access;
unknown's avatar
unknown committed
1802
    else if (tables->db && tables->db == thd->db)
unknown's avatar
unknown committed
1803 1804 1805 1806 1807 1808 1809 1810
    {
      if (found && !grant_option)		// db already checked
	tables->grant.privilege=found_access;
      else
      {
	if (check_access(thd,want_access,tables->db,&tables->grant.privilege))
	  return TRUE;				// Access denied
	found_access=tables->grant.privilege;
unknown's avatar
unknown committed
1811
	found=1;
unknown's avatar
unknown committed
1812 1813 1814 1815 1816 1817
      }
    }
    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege))
      return TRUE;				// Access denied
  }
  if (grant_option)
1818 1819
  {
    want_access &= ~EXTRA_ACL;			// Remove SHOW attribute
unknown's avatar
unknown committed
1820
    return check_grant(thd,want_access,org_tables);
1821
  }
unknown's avatar
unknown committed
1822 1823 1824 1825
  return FALSE;
}


unknown's avatar
unknown committed
1826
static bool check_db_used(THD *thd,TABLE_LIST *tables)
unknown's avatar
unknown committed
1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842
{
  for (; tables ; tables=tables->next)
  {
    if (!tables->db)
    {
      if (!(tables->db=thd->db))
      {
	send_error(&thd->net,ER_NO_DB_ERROR);	/* purecov: tested */
	return TRUE;				/* purecov: tested */
      }
    }
  }
  return FALSE;
}


1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858
static bool check_merge_table_access(THD *thd, char *db, TABLE_LIST *table_list)
{
  int error=0;
  if (table_list)
  {
    /* Force all tables to use the current database */
    TABLE_LIST *tmp;
    for (tmp=table_list; tmp ; tmp=tmp->next)
      tmp->db=db;
    error=check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
			     table_list);
  }
  return error;
}


unknown's avatar
unknown committed
1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931
/****************************************************************************
	Check stack size; Send error if there isn't enough stack to continue
****************************************************************************/

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

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

#define MY_YACC_INIT 1000			// Start with big alloc
#define MY_YACC_MAX  32000			// Because of 'short'

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


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

static void
mysql_init_query(THD *thd)
{
  DBUG_ENTER("mysql_init_query");
  thd->lex.item_list.empty();
  thd->lex.value_list.empty();
  thd->lex.table_list.elements=0;
  thd->free_list=0;

  thd->lex.table_list.first=0;
  thd->lex.table_list.next= (byte**) &thd->lex.table_list.first;
  thd->fatal_error=0;				// Safety
  thd->last_insert_id_used=thd->query_start_used=thd->insert_id_used=0;
1932
  thd->sent_row_count=0;
unknown's avatar
unknown committed
1933 1934 1935
  DBUG_VOID_RETURN;
}

1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951
void
mysql_init_select(LEX *lex)
{
  lex->where=lex->having=0;
  lex->select_limit=current_thd->default_select_limit;
  lex->offset_limit=0L;
  lex->options=0;
  lex->exchange = 0;
  lex->proc_list.first=0;
  lex->order_list.elements=lex->group_list.elements=0;
  lex->order_list.first=0;
  lex->order_list.next= (byte**) &lex->order_list.first;
  lex->group_list.first=0;
  lex->group_list.next= (byte**) &lex->group_list.first;
}

unknown's avatar
unknown committed
1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175

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

  mysql_init_query(thd);
  thd->query_length = length;
  LEX *lex=lex_start(thd, (uchar*) inBuf, length);
  if (!yyparse() && ! thd->fatal_error)
    mysql_execute_command();
  thd->proc_info="freeing items";
  free_items(thd);  /* Free strings used by items */
  lex_end(lex);
  DBUG_VOID_RETURN;
}


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


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

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

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

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

  if (new_field->length && new_field->decimals &&
      new_field->length < new_field->decimals+2 &&
      new_field->decimals != NOT_FIXED_DEC)
    new_field->length=new_field->decimals+2; /* purecov: inspected */

  switch (type) {
  case FIELD_TYPE_TINY:
    if (!length) new_field->length=3+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_SHORT:
    if (!length) new_field->length=5+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_INT24:
    if (!length) new_field->length=8+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_LONG:
    if (!length) new_field->length=10+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_LONGLONG:
    if (!length) new_field->length=20;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_STRING:
  case FIELD_TYPE_VAR_STRING:
  case FIELD_TYPE_NULL:
    break;
  case FIELD_TYPE_DECIMAL:
    if (!length)
      new_field->length = 10;			// Default length for DECIMAL
    new_field->length+=sign_len;
    if (new_field->decimals)
      new_field->length++;
    break;
  case FIELD_TYPE_BLOB:
  case FIELD_TYPE_TINY_BLOB:
  case FIELD_TYPE_LONG_BLOB:
  case FIELD_TYPE_MEDIUM_BLOB:
    if (default_value)				// Allow empty as default value
    {
      String str,*res;
      res=default_value->val_str(&str);
      if (res->length())
      {
	net_printf(&thd->net,ER_BLOB_CANT_HAVE_DEFAULT,field_name); /* purecov: inspected */
	DBUG_RETURN(1); /* purecov: inspected */
      }
      new_field->def=0;
    }
    new_field->flags|=BLOB_FLAG;
    break;
  case FIELD_TYPE_YEAR:
    if (!length || new_field->length != 2)
      new_field->length=4;			// Default length
    new_field->flags|= ZEROFILL_FLAG | UNSIGNED_FLAG;
    break;
  case FIELD_TYPE_FLOAT:
    /* change FLOAT(precision) to FLOAT or DOUBLE */
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    if (length && !decimals)
    {
      uint tmp_length=new_field->length;
      if (tmp_length > PRECISION_FOR_DOUBLE)
      {
	net_printf(&thd->net,ER_WRONG_FIELD_SPEC,field_name);
	DBUG_RETURN(1);
      }
      else if (tmp_length > PRECISION_FOR_FLOAT)
      {
	new_field->sql_type=FIELD_TYPE_DOUBLE;
	new_field->length=DBL_DIG+7;			// -[digits].E+###
      }
      else
	new_field->length=FLT_DIG+6;			// -[digits].E+##
      new_field->decimals= NOT_FIXED_DEC;
      break;
    }
    if (!length)
    {
      new_field->length =  FLT_DIG+6;
      new_field->decimals= NOT_FIXED_DEC;
    }
    break;
  case FIELD_TYPE_DOUBLE:
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    if (!length)
    {
      new_field->length = DBL_DIG+7;
      new_field->decimals=NOT_FIXED_DEC;
    }
    break;
  case FIELD_TYPE_TIMESTAMP:
    if (!length)
      new_field->length= 14;			// Full date YYYYMMDDHHMMSS
    else
    {
      new_field->length=((new_field->length+1)/2)*2; /* purecov: inspected */
      new_field->length= min(new_field->length,14); /* purecov: inspected */
    }
    new_field->flags|= ZEROFILL_FLAG | UNSIGNED_FLAG | NOT_NULL_FLAG;
    break;
  case FIELD_TYPE_DATE:				// Old date type
    if (protocol_version != PROTOCOL_VERSION-1)
      new_field->sql_type=FIELD_TYPE_NEWDATE;
    /* fall trough */
  case FIELD_TYPE_NEWDATE:
    new_field->length=10;
    break;
  case FIELD_TYPE_TIME:
    new_field->length=10;
    break;
  case FIELD_TYPE_DATETIME:
    new_field->length=19;
    break;
  case FIELD_TYPE_SET:
    {
      if (interval->count > sizeof(longlong)*8)
      {
	net_printf(&thd->net,ER_TOO_BIG_SET,field_name); /* purecov: inspected */
	DBUG_RETURN(1);				/* purecov: inspected */
      }
      new_field->pack_length=(interval->count+7)/8;
      if (new_field->pack_length > 4)
	new_field->pack_length=8;
      new_field->interval=interval;
      new_field->length=0;
      for (const char **pos=interval->type_names; *pos ; pos++)
unknown's avatar
unknown committed
2176
	new_field->length+=(uint) strlen(*pos)+1;
unknown's avatar
unknown committed
2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196
      new_field->length--;
      set_if_smaller(new_field->length,MAX_FIELD_WIDTH-1);
      if (default_value)
      {
	thd->cuted_fields=0;
	String str,*res;
	res=default_value->val_str(&str);
	(void) find_set(interval,res->ptr(),res->length());
	if (thd->cuted_fields)
	{
	  net_printf(&thd->net,ER_INVALID_DEFAULT,field_name);
	  DBUG_RETURN(1);
	}
      }
    }
    break;
  case FIELD_TYPE_ENUM:
    {
      new_field->interval=interval;
      new_field->pack_length=interval->count < 256 ? 1 : 2; // Should be safe
unknown's avatar
unknown committed
2197
      new_field->length=(uint) strlen(interval->type_names[0]);
unknown's avatar
unknown committed
2198 2199
      for (const char **pos=interval->type_names+1; *pos ; pos++)
      {
unknown's avatar
unknown committed
2200
	uint length=(uint) strlen(*pos);
unknown's avatar
unknown committed
2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272
	set_if_bigger(new_field->length,length);
      }
      set_if_smaller(new_field->length,MAX_FIELD_WIDTH-1);
      if (default_value)
      {
	String str,*res;
	res=default_value->val_str(&str);
	if (!find_enum(interval,res->ptr(),res->length()))
	{
	  net_printf(&thd->net,ER_INVALID_DEFAULT,field_name);
	  DBUG_RETURN(1);
	}
      }
      break;
    }
  }

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

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

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

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

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


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

static void remove_escape(char *name)
{
  char *to;
#ifdef USE_MB
unknown's avatar
unknown committed
2273
  char *strend=name+(uint) strlen(name);
unknown's avatar
unknown committed
2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347
#endif
  for (to=name; *name ; name++)
  {
#ifdef USE_MB
    int l;
/*    if ((l = ismbchar(name, name+MBMAXLEN))) { Wei He: I think it's wrong */
    if (use_mb(default_charset_info) &&
        (l = my_ismbchar(default_charset_info, name, strend)))
    {
	while (l--)
	    *to++ = *name++;
	name--;
	continue;
    }
#endif
    if (*name == '\\' && name[1])
      name++;					// Skipp '\\'
    *to++= *name;
  }
  *to=0;
}

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


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


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

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

#ifdef FN_LOWER_CASE
  if (!alias)					/* Alias is case sensitive */
    if (!(alias_str=sql_strmake(alias_str,table->table.length)))
      DBUG_RETURN(0);
  if (lower_case_table_names)
    casedn_str(table->table.str);
#endif
unknown's avatar
unknown committed
2348
  if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
unknown's avatar
unknown committed
2349 2350 2351 2352 2353 2354
    DBUG_RETURN(0);				/* purecov: inspected */
  ptr->db= table->db.str;
  ptr->real_name=table->table.str;
  ptr->name=alias_str;
  ptr->lock_type=flags;
  if (use_index)
unknown's avatar
unknown committed
2355
    ptr->use_index=(List<String> *) thd->memdup((gptr) use_index,
unknown's avatar
unknown committed
2356 2357
					       sizeof(*use_index));
  if (ignore_index)
unknown's avatar
unknown committed
2358 2359
    ptr->ignore_index=(List<String> *) thd->memdup((gptr) ignore_index,
						   sizeof(*ignore_index));
unknown's avatar
unknown committed
2360 2361 2362

  /* check that used name is unique */
  current_db=thd->db ? thd->db : "";
unknown's avatar
unknown committed
2363 2364

  if (flags != TL_IGNORE)
unknown's avatar
unknown committed
2365
  {
unknown's avatar
unknown committed
2366 2367
    for (TABLE_LIST *tables=(TABLE_LIST*) thd->lex.table_list.first ; tables ;
	 tables=tables->next)
unknown's avatar
unknown committed
2368
    {
unknown's avatar
unknown committed
2369 2370 2371 2372 2373 2374 2375
      if (!strcmp(alias_str,tables->name) &&
	  !strcmp(ptr->db ? ptr->db : current_db,
		  tables->db ? tables->db : current_db))
      {
	net_printf(&thd->net,ER_NONUNIQ_TABLE,alias_str); /* purecov: tested */
	DBUG_RETURN(0);				/* purecov: tested */
      }
unknown's avatar
unknown committed
2376 2377 2378 2379 2380 2381 2382 2383
    }
  }
  link_in_list(&thd->lex.table_list,(byte*) ptr,(byte**) &ptr->next);
  DBUG_RETURN(ptr);
}

void add_join_on(TABLE_LIST *b,Item *expr)
{
2384 2385 2386 2387 2388 2389 2390
  if (!b->on_expr)
    b->on_expr=expr;
  else
  {
    // This only happens if you have both a right and left join
    b->on_expr=new Item_cond_and(b->on_expr,expr);
  }
unknown's avatar
unknown committed
2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411
}


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

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

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

unknown's avatar
unknown committed
2412
bool reload_acl_and_cache(THD *thd, uint options, TABLE_LIST *tables)
unknown's avatar
unknown committed
2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433
{
  bool result=0;

  select_errors=0;				/* Write if more errors */
  mysql_log.flush();				// Flush log
  if (options & REFRESH_GRANT)
  {
    acl_reload();
    grant_reload();
  }
  if (options & REFRESH_LOG)
  {
    mysql_log.new_file();
    mysql_update_log.new_file();
    mysql_bin_log.new_file();
    mysql_slow_log.new_file();
    if (ha_flush_logs())
      result=1;
  }
  if (options & (REFRESH_TABLES | REFRESH_READ_LOCK))
  {
unknown's avatar
unknown committed
2434
    if ((options & REFRESH_READ_LOCK) && thd && ! thd->global_read_lock)
unknown's avatar
unknown committed
2435
    {
unknown's avatar
unknown committed
2436
      thd->global_read_lock=1;
unknown's avatar
unknown committed
2437 2438
      thread_safe_increment(global_read_lock,&LOCK_open);
    }
unknown's avatar
unknown committed
2439
    result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1, tables);
unknown's avatar
unknown committed
2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450
  }
  if (options & REFRESH_HOSTS)
    hostname_cache_refresh();
  if (options & REFRESH_STATUS)
    refresh_status();
  if (options & REFRESH_THREADS)
    flush_thread_cache();
  if (options & REFRESH_MASTER)
    reset_master();
  if (options & REFRESH_SLAVE)
    reset_slave();
unknown's avatar
unknown committed
2451

unknown's avatar
unknown committed
2452 2453 2454 2455
  return result;
}


2456
void kill_one_thread(THD *thd, ulong id)
unknown's avatar
unknown committed
2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512
{
  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For unlink from list
  I_List_iterator<THD> it(threads);
  THD *tmp;
  uint error=ER_NO_SUCH_THREAD;
  while ((tmp=it++))
  {
    if (tmp->thread_id == id)
    {
      if ((thd->master_access & PROCESS_ACL) ||
	  !strcmp(thd->user,tmp->user))
      {
	thr_alarm_kill(tmp->real_id);
	tmp->killed=1;
	error=0;
	if (tmp->mysys_var)
	{
	  pthread_mutex_lock(&tmp->mysys_var->mutex);
	  if (!tmp->system_thread)		// Don't abort locks
	    tmp->mysys_var->abort=1;
	  if (tmp->mysys_var->current_mutex)
	  {
	    pthread_mutex_lock(tmp->mysys_var->current_mutex);
	    pthread_cond_broadcast(tmp->mysys_var->current_cond);
	    pthread_mutex_unlock(tmp->mysys_var->current_mutex);
	  }
	  pthread_mutex_unlock(&tmp->mysys_var->mutex);
	}
      }
      else
	error=ER_KILL_DENIED_ERROR;
      break;					// Found thread
    }
  }
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
  if (!error)
    send_ok(&thd->net);
  else
    net_printf(&thd->net,error,id);
}

/* Clear most status variables */

static void refresh_status(void)
{
  pthread_mutex_lock(&THR_LOCK_keycache);
  pthread_mutex_lock(&LOCK_status);
  for (struct show_var_st *ptr=status_vars; ptr->name; ptr++)
  {
    if (ptr->type == SHOW_LONG)
      *(ulong*) ptr->value=0;
  }
  pthread_mutex_unlock(&LOCK_status);
  pthread_mutex_unlock(&THR_LOCK_keycache);
}