source3/smbd/server.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Main SMB server routines
   4    Copyright (C) Andrew Tridgell                1992-1998
   5    Copyright (C) Martin Pool                    2002
   6    Copyright (C) Jelmer Vernooij                2002-2003
   7    Copyright (C) Volker Lendecke                1993-2007
   8    Copyright (C) Jeremy Allison                 1993-2007
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "smbd/globals.h"
  26
  27 static_decl_rpc;
  28
  29 #ifdef WITH_DFS
  30 extern int dcelogin_atmost_once;
  31 #endif /* WITH_DFS */
  32
  33 int smbd_server_fd(void)
  34 {
  35         return server_fd;
  36 }
  37
  38 static void smbd_set_server_fd(int fd)
  39 {
  40         server_fd = fd;
  41 }
  42
  43 int get_client_fd(void)
  44 {
  45         return server_fd;
  46 }
  47
  48 struct event_context *smbd_event_context(void)
  49 {
  50         if (!smbd_event_ctx) {
  51                 smbd_event_ctx = event_context_init(talloc_autofree_context());
  52         }
  53         if (!smbd_event_ctx) {
  54                 smb_panic("Could not init smbd event context");
  55         }
  56         return smbd_event_ctx;
  57 }
  58
  59 struct messaging_context *smbd_messaging_context(void)
  60 {
  61         if (smbd_msg_ctx == NULL) {
  62                 smbd_msg_ctx = messaging_init(talloc_autofree_context(),
  63                                               server_id_self(),
  64                                               smbd_event_context());
  65         }
  66         if (smbd_msg_ctx == NULL) {
  67                 DEBUG(0, ("Could not init smbd messaging context.\n"));
  68         }
  69         return smbd_msg_ctx;
  70 }
  71
  72 struct memcache *smbd_memcache(void)
  73 {
  74         if (!smbd_memcache_ctx) {
  75                 smbd_memcache_ctx = memcache_init(talloc_autofree_context(),
  76                                                   lp_max_stat_cache_size()*1024);
  77         }
  78         if (!smbd_memcache_ctx) {
  79                 smb_panic("Could not init smbd memcache");
  80         }
  81
  82         return smbd_memcache_ctx;
  83 }
  84
  85 /*******************************************************************
  86  What to do when smb.conf is updated.
  87  ********************************************************************/
  88
  89 static void smb_conf_updated(struct messaging_context *msg,
  90                              void *private_data,
  91                              uint32_t msg_type,
  92                              struct server_id server_id,
  93                              DATA_BLOB *data)
  94 {
  95         DEBUG(10,("smb_conf_updated: Got message saying smb.conf was "
  96                   "updated. Reloading.\n"));
  97         reload_services(False);
  98 }
  99
 100
 101 /*******************************************************************
 102  Delete a statcache entry.
 103  ********************************************************************/
 104
 105 static void smb_stat_cache_delete(struct messaging_context *msg,
 106                                   void *private_data,
 107                                   uint32_t msg_tnype,
 108                                   struct server_id server_id,
 109                                   DATA_BLOB *data)
 110 {
 111         const char *name = (const char *)data->data;
 112         DEBUG(10,("smb_stat_cache_delete: delete name %s\n", name));
 113         stat_cache_delete(name);
 114 }
 115
 116 /****************************************************************************
 117  Terminate signal.
 118 ****************************************************************************/
 119
 120 static void sig_term(void)
 121 {
 122         got_sig_term = 1;
 123         sys_select_signal(SIGTERM);
 124 }
 125
 126 /****************************************************************************
 127  Catch a sighup.
 128 ****************************************************************************/
 129
 130 static void sig_hup(int sig)
 131 {
 132         reload_after_sighup = 1;
 133         sys_select_signal(SIGHUP);
 134 }
 135
 136 /****************************************************************************
 137  Catch a sigcld
 138 ****************************************************************************/
 139 static void sig_cld(int sig)
 140 {
 141         got_sig_cld = 1;
 142         sys_select_signal(SIGCLD);
 143 }
 144
 145 /****************************************************************************
 146   Send a SIGTERM to our process group.
 147 *****************************************************************************/
 148
 149 static void  killkids(void)
 150 {
 151         if(am_parent) kill(0,SIGTERM);
 152 }
 153
 154 /****************************************************************************
 155  Process a sam sync message - not sure whether to do this here or
 156  somewhere else.
 157 ****************************************************************************/
 158
 159 static void msg_sam_sync(struct messaging_context *msg,
 160                          void *private_data,
 161                          uint32_t msg_type,
 162                          struct server_id server_id,
 163                          DATA_BLOB *data)
 164 {
 165         DEBUG(10, ("** sam sync message received, ignoring\n"));
 166 }
 167
 168
 169 /****************************************************************************
 170  Open the socket communication - inetd.
 171 ****************************************************************************/
 172
 173 static bool open_sockets_inetd(void)
 174 {
 175         /* Started from inetd. fd 0 is the socket. */
 176         /* We will abort gracefully when the client or remote system
 177            goes away */
 178         smbd_set_server_fd(dup(0));
 179
 180         /* close our standard file descriptors */
 181         close_low_fds(False); /* Don't close stderr */
 182
 183         return True;
 184 }
 185
 186 static void msg_exit_server(struct messaging_context *msg,
 187                             void *private_data,
 188                             uint32_t msg_type,
 189                             struct server_id server_id,
 190                             DATA_BLOB *data)
 191 {
 192         DEBUG(3, ("got a SHUTDOWN message\n"));
 193         exit_server_cleanly(NULL);
 194 }
 195
 196 #ifdef DEVELOPER
 197 static void msg_inject_fault(struct messaging_context *msg,
 198                              void *private_data,
 199                              uint32_t msg_type,
 200                              struct server_id src,
 201                              DATA_BLOB *data)
 202 {
 203         int sig;
 204
 205         if (data->length != sizeof(sig)) {
 206
 207                 DEBUG(0, ("Process %s sent bogus signal injection request\n",
 208                           procid_str_static(&src)));
 209                 return;
 210         }
 211
 212         sig = *(int *)data->data;
 213         if (sig == -1) {
 214                 exit_server("internal error injected");
 215                 return;
 216         }
 217
 218 #if HAVE_STRSIGNAL
 219         DEBUG(0, ("Process %s requested injection of signal %d (%s)\n",
 220                   procid_str_static(&src), sig, strsignal(sig)));
 221 #else
 222         DEBUG(0, ("Process %s requested injection of signal %d\n",
 223                   procid_str_static(&src), sig));
 224 #endif
 225
 226         kill(sys_getpid(), sig);
 227 }
 228 #endif /* DEVELOPER */
 229
 230 struct child_pid {
 231         struct child_pid *prev, *next;
 232         pid_t pid;
 233 };
 234
 235 static void add_child_pid(pid_t pid)
 236 {
 237         struct child_pid *child;
 238
 239         if (lp_max_smbd_processes() == 0) {
 240                 /* Don't bother with the child list if we don't care anyway */
 241                 return;
 242         }
 243
 244         child = SMB_MALLOC_P(struct child_pid);
 245         if (child == NULL) {
 246                 DEBUG(0, ("Could not add child struct -- malloc failed\n"));
 247                 return;
 248         }
 249         child->pid = pid;
 250         DLIST_ADD(children, child);
 251         num_children += 1;
 252 }
 253
 254 static void remove_child_pid(pid_t pid, bool unclean_shutdown)
 255 {
 256         struct child_pid *child;
 257
 258         if (unclean_shutdown) {
 259                 /* a child terminated uncleanly so tickle all processes to see
 260                    if they can grab any of the pending locks
 261                 */
 262                 DEBUG(3,(__location__ " Unclean shutdown of pid %u\n", pid));
 263                 messaging_send_buf(smbd_messaging_context(), procid_self(),
 264                                    MSG_SMB_BRL_VALIDATE, NULL, 0);
 265                 message_send_all(smbd_messaging_context(),
 266                                  MSG_SMB_UNLOCK, NULL, 0, NULL);
 267         }
 268
 269         if (lp_max_smbd_processes() == 0) {
 270                 /* Don't bother with the child list if we don't care anyway */
 271                 return;
 272         }
 273
 274         for (child = children; child != NULL; child = child->next) {
 275                 if (child->pid == pid) {
 276                         struct child_pid *tmp = child;
 277                         DLIST_REMOVE(children, child);
 278                         SAFE_FREE(tmp);
 279                         num_children -= 1;
 280                         return;
 281                 }
 282         }
 283
 284         DEBUG(0, ("Could not find child %d -- ignoring\n", (int)pid));
 285 }
 286
 287 /****************************************************************************
 288  Have we reached the process limit ?
 289 ****************************************************************************/
 290
 291 static bool allowable_number_of_smbd_processes(void)
 292 {
 293         int max_processes = lp_max_smbd_processes();
 294
 295         if (!max_processes)
 296                 return True;
 297
 298         return num_children < max_processes;
 299 }
 300
 301 /****************************************************************************
 302  Open the socket communication.
 303 ****************************************************************************/
 304
 305 static bool open_sockets_smbd(bool is_daemon, bool interactive, const char *smb_ports)
 306 {
 307         int num_interfaces = iface_count();
 308         int num_sockets = 0;
 309         int fd_listenset[FD_SETSIZE];
 310         fd_set listen_set;
 311         int s;
 312         int maxfd = 0;
 313         int i;
 314         char *ports;
 315         struct dns_reg_state * dns_reg = NULL;
 316         unsigned dns_port = 0;
 317
 318         if (!is_daemon) {
 319                 return open_sockets_inetd();
 320         }
 321
 322 #ifdef HAVE_ATEXIT
 323         atexit(killkids);
 324 #endif
 325
 326         /* Stop zombies */
 327         CatchSignal(SIGCLD, sig_cld);
 328
 329         FD_ZERO(&listen_set);
 330
 331         /* use a reasonable default set of ports - listing on 445 and 139 */
 332         if (!smb_ports) {
 333                 ports = lp_smb_ports();
 334                 if (!ports || !*ports) {
 335                         ports = smb_xstrdup(SMB_PORTS);
 336                 } else {
 337                         ports = smb_xstrdup(ports);
 338                 }
 339         } else {
 340                 ports = smb_xstrdup(smb_ports);
 341         }
 342
 343         if (lp_interfaces() && lp_bind_interfaces_only()) {
 344                 /* We have been given an interfaces line, and been
 345                    told to only bind to those interfaces. Create a
 346                    socket per interface and bind to only these.
 347                 */
 348
 349                 /* Now open a listen socket for each of the
 350                    interfaces. */
 351                 for(i = 0; i < num_interfaces; i++) {
 352                         TALLOC_CTX *frame = NULL;
 353                         const struct sockaddr_storage *ifss =
 354                                         iface_n_sockaddr_storage(i);
 355                         char *tok;
 356                         const char *ptr;
 357
 358                         if (ifss == NULL) {
 359                                 DEBUG(0,("open_sockets_smbd: "
 360                                         "interface %d has NULL IP address !\n",
 361                                         i));
 362                                 continue;
 363                         }
 364
 365                         frame = talloc_stackframe();
 366                         for (ptr=ports;
 367                                         next_token_talloc(frame,&ptr, &tok, " \t,");) {
 368                                 unsigned port = atoi(tok);
 369                                 if (port == 0 || port > 0xffff) {
 370                                         continue;
 371                                 }
 372
 373                                 /* Keep the first port for mDNS service
 374                                  * registration.
 375                                  */
 376                                 if (dns_port == 0) {
 377                                         dns_port = port;
 378                                 }
 379
 380                                 s = fd_listenset[num_sockets] =
 381                                         open_socket_in(SOCK_STREAM,
 382                                                         port,
 383                                                         num_sockets == 0 ? 0 : 2,
 384                                                         ifss,
 385                                                         true);
 386                                 if(s == -1) {
 387                                         continue;
 388                                 }
 389
 390                                 /* ready to listen */
 391                                 set_socket_options(s,"SO_KEEPALIVE");
 392                                 set_socket_options(s,lp_socket_options());
 393
 394                                 /* Set server socket to
 395                                  * non-blocking for the accept. */
 396                                 set_blocking(s,False);
 397
 398                                 if (listen(s, SMBD_LISTEN_BACKLOG) == -1) {
 399                                         DEBUG(0,("open_sockets_smbd: listen: "
 400                                                 "%s\n", strerror(errno)));
 401                                         close(s);
 402                                         TALLOC_FREE(frame);
 403                                         return False;
 404                                 }
 405                                 FD_SET(s,&listen_set);
 406                                 maxfd = MAX( maxfd, s);
 407
 408                                 num_sockets++;
 409                                 if (num_sockets >= FD_SETSIZE) {
 410                                         DEBUG(0,("open_sockets_smbd: Too "
 411                                                 "many sockets to bind to\n"));
 412                                         TALLOC_FREE(frame);
 413                                         return False;
 414                                 }
 415                         }
 416                         TALLOC_FREE(frame);
 417                 }
 418         } else {
 419                 /* Just bind to 0.0.0.0 - accept connections
 420                    from anywhere. */
 421
 422                 TALLOC_CTX *frame = talloc_stackframe();
 423                 char *tok;
 424                 const char *ptr;
 425                 const char *sock_addr = lp_socket_address();
 426                 char *sock_tok;
 427                 const char *sock_ptr;
 428
 429                 if (strequal(sock_addr, "0.0.0.0") ||
 430                     strequal(sock_addr, "::")) {
 431 #if HAVE_IPV6
 432                         sock_addr = "::,0.0.0.0";
 433 #else
 434                         sock_addr = "0.0.0.0";
 435 #endif
 436                 }
 437
 438                 for (sock_ptr=sock_addr;
 439                                 next_token_talloc(frame, &sock_ptr, &sock_tok, " \t,"); ) {
 440                         for (ptr=ports; next_token_talloc(frame, &ptr, &tok, " \t,"); ) {
 441                                 struct sockaddr_storage ss;
 442
 443                                 unsigned port = atoi(tok);
 444                                 if (port == 0 || port > 0xffff) {
 445                                         continue;
 446                                 }
 447
 448                                 /* Keep the first port for mDNS service
 449                                  * registration.
 450                                  */
 451                                 if (dns_port == 0) {
 452                                         dns_port = port;
 453                                 }
 454
 455                                 /* open an incoming socket */
 456                                 if (!interpret_string_addr(&ss, sock_tok,
 457                                                 AI_NUMERICHOST|AI_PASSIVE)) {
 458                                         continue;
 459                                 }
 460
 461                                 s = open_socket_in(SOCK_STREAM,
 462                                                 port,
 463                                                 num_sockets == 0 ? 0 : 2,
 464                                                 &ss,
 465                                                 true);
 466                                 if (s == -1) {
 467                                         continue;
 468                                 }
 469
 470                                 /* ready to listen */
 471                                 set_socket_options(s,"SO_KEEPALIVE");
 472                                 set_socket_options(s,lp_socket_options());
 473
 474                                 /* Set server socket to non-blocking
 475                                  * for the accept. */
 476                                 set_blocking(s,False);
 477
 478                                 if (listen(s, SMBD_LISTEN_BACKLOG) == -1) {
 479                                         DEBUG(0,("open_sockets_smbd: "
 480                                                 "listen: %s\n",
 481                                                  strerror(errno)));
 482                                         close(s);
 483                                         TALLOC_FREE(frame);
 484                                         return False;
 485                                 }
 486
 487                                 fd_listenset[num_sockets] = s;
 488                                 FD_SET(s,&listen_set);
 489                                 maxfd = MAX( maxfd, s);
 490
 491                                 num_sockets++;
 492
 493                                 if (num_sockets >= FD_SETSIZE) {
 494                                         DEBUG(0,("open_sockets_smbd: Too "
 495                                                 "many sockets to bind to\n"));
 496                                         TALLOC_FREE(frame);
 497                                         return False;
 498                                 }
 499                         }
 500                 }
 501                 TALLOC_FREE(frame);
 502         }
 503
 504         SAFE_FREE(ports);
 505
 506         if (num_sockets == 0) {
 507                 DEBUG(0,("open_sockets_smbd: No "
 508                         "sockets available to bind to.\n"));
 509                 return false;
 510         }
 511
 512         /* Setup the main smbd so that we can get messages. Note that
 513            do this after starting listening. This is needed as when in
 514            clustered mode, ctdb won't allow us to start doing database
 515            operations until it has gone thru a full startup, which
 516            includes checking to see that smbd is listening. */
 517         claim_connection(NULL,"",
 518                          FLAG_MSG_GENERAL|FLAG_MSG_SMBD|FLAG_MSG_DBWRAP);
 519
 520         /* Listen to messages */
 521
 522         messaging_register(smbd_messaging_context(), NULL,
 523                            MSG_SMB_SAM_SYNC, msg_sam_sync);
 524         messaging_register(smbd_messaging_context(), NULL,
 525                            MSG_SHUTDOWN, msg_exit_server);
 526         messaging_register(smbd_messaging_context(), NULL,
 527                            MSG_SMB_FILE_RENAME, msg_file_was_renamed);
 528         messaging_register(smbd_messaging_context(), NULL,
 529                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 530         messaging_register(smbd_messaging_context(), NULL,
 531                            MSG_SMB_STAT_CACHE_DELETE, smb_stat_cache_delete);
 532         brl_register_msgs(smbd_messaging_context());
 533
 534 #ifdef CLUSTER_SUPPORT
 535         if (lp_clustering()) {
 536                 ctdbd_register_reconfigure(messaging_ctdbd_connection());
 537         }
 538 #endif
 539
 540 #ifdef DEVELOPER
 541         messaging_register(smbd_messaging_context(), NULL,
 542                            MSG_SMB_INJECT_FAULT, msg_inject_fault);
 543 #endif
 544
 545         /* now accept incoming connections - forking a new process
 546            for each incoming connection */
 547         DEBUG(2,("waiting for a connection\n"));
 548         while (1) {
 549                 struct timeval now, idle_timeout;
 550                 fd_set r_fds, w_fds;
 551                 int num;
 552
 553                 if (got_sig_cld) {
 554                         pid_t pid;
 555                         int status;
 556
 557                         got_sig_cld = False;
 558
 559                         while ((pid = sys_waitpid(-1, &status, WNOHANG)) > 0) {
 560                                 bool unclean_shutdown = False;
 561
 562                                 /* If the child terminated normally, assume
 563                                    it was an unclean shutdown unless the
 564                                    status is 0
 565                                 */
 566                                 if (WIFEXITED(status)) {
 567                                         unclean_shutdown = WEXITSTATUS(status);
 568                                 }
 569                                 /* If the child terminated due to a signal
 570                                    we always assume it was unclean.
 571                                 */
 572                                 if (WIFSIGNALED(status)) {
 573                                         unclean_shutdown = True;
 574                                 }
 575                                 remove_child_pid(pid, unclean_shutdown);
 576                         }
 577                 }
 578
 579                 if (run_events(smbd_event_context(), 0, NULL, NULL)) {
 580                         continue;
 581                 }
 582
 583                 idle_timeout = timeval_zero();
 584
 585                 memcpy((char *)&r_fds, (char *)&listen_set,
 586                        sizeof(listen_set));
 587                 FD_ZERO(&w_fds);
 588                 GetTimeOfDay(&now);
 589
 590                 /* Kick off our mDNS registration. */
 591                 if (dns_port != 0) {
 592                         dns_register_smbd(&dns_reg, dns_port, &maxfd,
 593                                         &r_fds, &idle_timeout);
 594                 }
 595
 596                 event_add_to_select_args(smbd_event_context(), &now,
 597                                          &r_fds, &w_fds, &idle_timeout,
 598                                          &maxfd);
 599
 600                 num = sys_select(maxfd+1,&r_fds,&w_fds,NULL,
 601                                  timeval_is_zero(&idle_timeout) ?
 602                                  NULL : &idle_timeout);
 603
 604                 if (run_events(smbd_event_context(), num, &r_fds, &w_fds)) {
 605                         continue;
 606                 }
 607
 608                 if (num == -1 && errno == EINTR) {
 609                         if (got_sig_term) {
 610                                 exit_server_cleanly(NULL);
 611                         }
 612
 613                         /* check for sighup processing */
 614                         if (reload_after_sighup) {
 615                                 change_to_root_user();
 616                                 DEBUG(1,("Reloading services after SIGHUP\n"));
 617                                 reload_services(False);
 618                                 reload_after_sighup = 0;
 619                         }
 620
 621                         continue;
 622                 }
 623
 624
 625                 /* If the idle timeout fired and we don't have any connected
 626                  * users, exit gracefully. We should be running under a process
 627                  * controller that will restart us if necessry.
 628                  */
 629                 if (num == 0 && count_all_current_connections() == 0) {
 630                         exit_server_cleanly("idle timeout");
 631                 }
 632
 633                 /* process pending nDNS responses */
 634                 if (dns_register_smbd_reply(dns_reg, &r_fds, &idle_timeout)) {
 635                         --num;
 636                 }
 637
 638                 /* check if we need to reload services */
 639                 check_reload(time(NULL));
 640
 641                 /* Find the sockets that are read-ready -
 642                    accept on these. */
 643                 for( ; num > 0; num--) {
 644                         struct sockaddr addr;
 645                         socklen_t in_addrlen = sizeof(addr);
 646                         pid_t child = 0;
 647
 648                         s = -1;
 649                         for(i = 0; i < num_sockets; i++) {
 650                                 if(FD_ISSET(fd_listenset[i],&r_fds)) {
 651                                         s = fd_listenset[i];
 652                                         /* Clear this so we don't look
 653                                            at it again. */
 654                                         FD_CLR(fd_listenset[i],&r_fds);
 655                                         break;
 656                                 }
 657                         }
 658
 659                         smbd_set_server_fd(accept(s,&addr,&in_addrlen));
 660
 661                         if (smbd_server_fd() == -1 && errno == EINTR)
 662                                 continue;
 663
 664                         if (smbd_server_fd() == -1) {
 665                                 DEBUG(2,("open_sockets_smbd: accept: %s\n",
 666                                          strerror(errno)));
 667                                 continue;
 668                         }
 669
 670                         if (interactive)
 671                                 return True;
 672
 673                         if (allowable_number_of_smbd_processes() &&
 674                             ((child = sys_fork())==0)) {
 675                                 /* Child code ... */
 676
 677                                 /* Stop zombies, the parent explicitly handles
 678                                  * them, counting worker smbds. */
 679                                 CatchChild();
 680
 681                                 /* close the listening socket(s) */
 682                                 for(i = 0; i < num_sockets; i++)
 683                                         close(fd_listenset[i]);
 684
 685                                 /* close our mDNS daemon handle */
 686                                 dns_register_close(&dns_reg);
 687
 688                                 /* close our standard file
 689                                    descriptors */
 690                                 close_low_fds(False);
 691                                 am_parent = 0;
 692
 693                                 if (!reinit_after_fork(
 694                                             smbd_messaging_context(),
 695                                             smbd_event_context(),
 696                                             true)) {
 697                                         DEBUG(0,("reinit_after_fork() failed\n"));
 698                                         smb_panic("reinit_after_fork() failed");
 699                                 }
 700
 701                                 return True;
 702                         }
 703                         /* The parent doesn't need this socket */
 704                         close(smbd_server_fd());
 705
 706                         /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
 707                                 Clear the closed fd info out of server_fd --
 708                                 and more importantly, out of client_fd in
 709                                 util_sock.c, to avoid a possible
 710                                 getpeername failure if we reopen the logs
 711                                 and use %I in the filename.
 712                         */
 713
 714                         smbd_set_server_fd(-1);
 715
 716                         if (child != 0) {
 717                                 add_child_pid(child);
 718                         }
 719
 720                         /* Force parent to check log size after
 721                          * spawning child.  Fix from
 722                          * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
 723                          * parent smbd will log to logserver.smb.  It
 724                          * writes only two messages for each child
 725                          * started/finished. But each child writes,
 726                          * say, 50 messages also in logserver.smb,
 727                          * begining with the debug_count of the
 728                          * parent, before the child opens its own log
 729                          * file logserver.client. In a worst case
 730                          * scenario the size of logserver.smb would be
 731                          * checked after about 50*50=2500 messages
 732                          * (ca. 100kb).
 733                          * */
 734                         force_check_log_size();
 735
 736                 } /* end for num */
 737         } /* end while 1 */
 738
 739 /* NOTREACHED   return True; */
 740 }
 741
 742 /****************************************************************************
 743  Reload printers
 744 **************************************************************************/
 745 void reload_printers(void)
 746 {
 747         int snum;
 748         int n_services = lp_numservices();
 749         int pnum = lp_servicenumber(PRINTERS_NAME);
 750         const char *pname;
 751
 752         pcap_cache_reload();
 753
 754         /* remove stale printers */
 755         for (snum = 0; snum < n_services; snum++) {
 756                 /* avoid removing PRINTERS_NAME or non-autoloaded printers */
 757                 if (snum == pnum || !(lp_snum_ok(snum) && lp_print_ok(snum) &&
 758                                       lp_autoloaded(snum)))
 759                         continue;
 760
 761                 pname = lp_printername(snum);
 762                 if (!pcap_printername_ok(pname)) {
 763                         DEBUG(3, ("removing stale printer %s\n", pname));
 764
 765                         if (is_printer_published(NULL, snum, NULL))
 766                                 nt_printer_publish(NULL, snum, SPOOL_DS_UNPUBLISH);
 767                         del_a_printer(pname);
 768                         lp_killservice(snum);
 769                 }
 770         }
 771
 772         load_printers();
 773 }
 774
 775 /****************************************************************************
 776  Reload the services file.
 777 **************************************************************************/
 778
 779 bool reload_services(bool test)
 780 {
 781         bool ret;
 782
 783         if (lp_loaded()) {
 784                 char *fname = lp_configfile();
 785                 if (file_exist(fname) &&
 786                     !strcsequal(fname, get_dyn_CONFIGFILE())) {
 787                         set_dyn_CONFIGFILE(fname);
 788                         test = False;
 789                 }
 790         }
 791
 792         reopen_logs();
 793
 794         if (test && !lp_file_list_changed())
 795                 return(True);
 796
 797         lp_killunused(conn_snum_used);
 798
 799         ret = lp_load(get_dyn_CONFIGFILE(), False, False, True, True);
 800
 801         reload_printers();
 802
 803         /* perhaps the config filename is now set */
 804         if (!test)
 805                 reload_services(True);
 806
 807         reopen_logs();
 808
 809         load_interfaces();
 810
 811         if (smbd_server_fd() != -1) {
 812                 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 813                 set_socket_options(smbd_server_fd(), lp_socket_options());
 814         }
 815
 816         mangle_reset_cache();
 817         reset_stat_cache();
 818
 819         /* this forces service parameters to be flushed */
 820         set_current_service(NULL,0,True);
 821
 822         return(ret);
 823 }
 824
 825 /****************************************************************************
 826  Exit the server.
 827 ****************************************************************************/
 828
 829 /* Reasons for shutting down a server process. */
 830 enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
 831
 832 static void exit_server_common(enum server_exit_reason how,
 833         const char *const reason) _NORETURN_;
 834
 835 static void exit_server_common(enum server_exit_reason how,
 836         const char *const reason)
 837 {
 838         bool had_open_conn;
 839
 840         if (!exit_firsttime)
 841                 exit(0);
 842         exit_firsttime = false;
 843
 844         change_to_root_user();
 845
 846         if (negprot_global_auth_context) {
 847                 (negprot_global_auth_context->free)(&negprot_global_auth_context);
 848         }
 849
 850         had_open_conn = conn_close_all();
 851
 852         invalidate_all_vuids();
 853
 854         /* 3 second timeout. */
 855         print_notify_send_messages(smbd_messaging_context(), 3);
 856
 857         /* delete our entry in the connections database. */
 858         yield_connection(NULL,"");
 859
 860         respond_to_all_remaining_local_messages();
 861
 862 #ifdef WITH_DFS
 863         if (dcelogin_atmost_once) {
 864                 dfs_unlogin();
 865         }
 866 #endif
 867
 868 #ifdef USE_DMAPI
 869         /* Destroy Samba DMAPI session only if we are master smbd process */
 870         if (am_parent) {
 871                 if (!dmapi_destroy_session()) {
 872                         DEBUG(0,("Unable to close Samba DMAPI session\n"));
 873                 }
 874         }
 875 #endif
 876
 877         locking_end();
 878         printing_end();
 879
 880         if (how != SERVER_EXIT_NORMAL) {
 881                 int oldlevel = DEBUGLEVEL;
 882
 883                 DEBUGLEVEL = 10;
 884
 885                 DEBUGSEP(0);
 886                 DEBUG(0,("Abnormal server exit: %s\n",
 887                         reason ? reason : "no explanation provided"));
 888                 DEBUGSEP(0);
 889
 890                 log_stack_trace();
 891
 892                 DEBUGLEVEL = oldlevel;
 893                 dump_core();
 894
 895         } else {
 896                 DEBUG(3,("Server exit (%s)\n",
 897                         (reason ? reason : "normal exit")));
 898         }
 899
 900         /* if we had any open SMB connections when we exited then we
 901            need to tell the parent smbd so that it can trigger a retry
 902            of any locks we may have been holding or open files we were
 903            blocking */
 904         if (had_open_conn) {
 905                 exit(1);
 906         } else {
 907                 exit(0);
 908         }
 909 }
 910
 911 void exit_server(const char *const explanation)
 912 {
 913         exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
 914 }
 915
 916 void exit_server_cleanly(const char *const explanation)
 917 {
 918         exit_server_common(SERVER_EXIT_NORMAL, explanation);
 919 }
 920
 921 void exit_server_fault(void)
 922 {
 923         exit_server("critical server fault");
 924 }
 925
 926 /****************************************************************************
 927  Initialise connect, service and file structs.
 928 ****************************************************************************/
 929
 930 static bool init_structs(void )
 931 {
 932         /*
 933          * Set the machine NETBIOS name if not already
 934          * set from the config file.
 935          */
 936
 937         if (!init_names())
 938                 return False;
 939
 940         conn_init();
 941
 942         file_init();
 943
 944         init_dptrs();
 945
 946         if (!secrets_init())
 947                 return False;
 948
 949         return True;
 950 }
 951
 952 /****************************************************************************
 953  main program.
 954 ****************************************************************************/
 955
 956 /* Declare prototype for build_options() to avoid having to run it through
 957    mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
 958    prototype generation system is too complicated. */
 959
 960 extern void build_options(bool screen);
 961
 962  int main(int argc,const char *argv[])
 963 {
 964         /* shall I run as a daemon */
 965         bool is_daemon = false;
 966         bool interactive = false;
 967         bool Fork = true;
 968         bool no_process_group = false;
 969         bool log_stdout = false;
 970         char *ports = NULL;
 971         char *profile_level = NULL;
 972         int opt;
 973         poptContext pc;
 974         bool print_build_options = False;
 975         enum {
 976                 OPT_DAEMON = 1000,
 977                 OPT_INTERACTIVE,
 978                 OPT_FORK,
 979                 OPT_NO_PROCESS_GROUP,
 980                 OPT_LOG_STDOUT
 981         };
 982         struct poptOption long_options[] = {
 983         POPT_AUTOHELP
 984         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
 985         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
 986         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
 987         {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
 988         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
 989         {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
 990         {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
 991         {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
 992         POPT_COMMON_SAMBA
 993         POPT_COMMON_DYNCONFIG
 994         POPT_TABLEEND
 995         };
 996         TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
 997
 998         smbd_init_globals();
 999
1000         TimeInit();
1001
1002 #ifdef HAVE_SET_AUTH_PARAMETERS
1003         set_auth_parameters(argc,argv);
1004 #endif
1005
1006         pc = poptGetContext("smbd", argc, argv, long_options, 0);
1007         while((opt = poptGetNextOpt(pc)) != -1) {
1008                 switch (opt)  {
1009                 case OPT_DAEMON:
1010                         is_daemon = true;
1011                         break;
1012                 case OPT_INTERACTIVE:
1013                         interactive = true;
1014                         break;
1015                 case OPT_FORK:
1016                         Fork = false;
1017                         break;
1018                 case OPT_NO_PROCESS_GROUP:
1019                         no_process_group = true;
1020                         break;
1021                 case OPT_LOG_STDOUT:
1022                         log_stdout = true;
1023                         break;
1024                 case 'b':
1025                         print_build_options = True;
1026                         break;
1027                 default:
1028                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1029                                   poptBadOption(pc, 0), poptStrerror(opt));
1030                         poptPrintUsage(pc, stderr, 0);
1031                         exit(1);
1032                 }
1033         }
1034         poptFreeContext(pc);
1035
1036         if (interactive) {
1037                 Fork = False;
1038                 log_stdout = True;
1039         }
1040
1041         setup_logging(argv[0],log_stdout);
1042
1043         if (print_build_options) {
1044                 build_options(True); /* Display output to screen as well as debug */
1045                 exit(0);
1046         }
1047
1048         load_case_tables();
1049
1050 #ifdef HAVE_SETLUID
1051         /* needed for SecureWare on SCO */
1052         setluid(0);
1053 #endif
1054
1055         sec_init();
1056
1057         set_remote_machine_name("smbd", False);
1058
1059         if (interactive && (DEBUGLEVEL >= 9)) {
1060                 talloc_enable_leak_report();
1061         }
1062
1063         if (log_stdout && Fork) {
1064                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
1065                 exit(1);
1066         }
1067
1068         /* we want to re-seed early to prevent time delays causing
1069            client problems at a later date. (tridge) */
1070         generate_random_buffer(NULL, 0);
1071
1072         /* make absolutely sure we run as root - to handle cases where people
1073            are crazy enough to have it setuid */
1074
1075         gain_root_privilege();
1076         gain_root_group_privilege();
1077
1078         fault_setup((void (*)(void *))exit_server_fault);
1079         dump_core_setup("smbd");
1080
1081         CatchSignal(SIGTERM , SIGNAL_CAST sig_term);
1082         CatchSignal(SIGHUP,SIGNAL_CAST sig_hup);
1083
1084         /* we are never interested in SIGPIPE */
1085         BlockSignals(True,SIGPIPE);
1086
1087 #if defined(SIGFPE)
1088         /* we are never interested in SIGFPE */
1089         BlockSignals(True,SIGFPE);
1090 #endif
1091
1092 #if defined(SIGUSR2)
1093         /* We are no longer interested in USR2 */
1094         BlockSignals(True,SIGUSR2);
1095 #endif
1096
1097         /* POSIX demands that signals are inherited. If the invoking process has
1098          * these signals masked, we will have problems, as we won't recieve them. */
1099         BlockSignals(False, SIGHUP);
1100         BlockSignals(False, SIGUSR1);
1101         BlockSignals(False, SIGTERM);
1102
1103         /* we want total control over the permissions on created files,
1104            so set our umask to 0 */
1105         umask(0);
1106
1107         init_sec_ctx();
1108
1109         reopen_logs();
1110
1111         DEBUG(0,("smbd version %s started.\n", samba_version_string()));
1112         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1113
1114         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1115                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1116
1117         /* Output the build options to the debug log */
1118         build_options(False);
1119
1120         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1121                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1122                 exit(1);
1123         }
1124
1125         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1126                 DEBUG(0, ("error opening config file\n"));
1127                 exit(1);
1128         }
1129
1130         if (smbd_messaging_context() == NULL)
1131                 exit(1);
1132
1133         if (!reload_services(False))
1134                 return(-1);
1135
1136         init_structs();
1137
1138 #ifdef WITH_PROFILE
1139         if (!profile_setup(smbd_messaging_context(), False)) {
1140                 DEBUG(0,("ERROR: failed to setup profiling\n"));
1141                 return -1;
1142         }
1143         if (profile_level != NULL) {
1144                 int pl = atoi(profile_level);
1145                 struct server_id src;
1146
1147                 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1148                 src.pid = getpid();
1149                 set_profile_level(pl, src);
1150         }
1151 #endif
1152
1153         DEBUG(3,( "loaded services\n"));
1154
1155         if (!is_daemon && !is_a_socket(0)) {
1156                 if (!interactive)
1157                         DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1158
1159                 /*
1160                  * Setting is_daemon here prevents us from eventually calling
1161                  * the open_sockets_inetd()
1162                  */
1163
1164                 is_daemon = True;
1165         }
1166
1167         if (is_daemon && !interactive) {
1168                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1169                 become_daemon(Fork, no_process_group);
1170         }
1171
1172 #if HAVE_SETPGID
1173         /*
1174          * If we're interactive we want to set our own process group for
1175          * signal management.
1176          */
1177         if (interactive && !no_process_group)
1178                 setpgid( (pid_t)0, (pid_t)0);
1179 #endif
1180
1181         if (!directory_exist(lp_lockdir()))
1182                 mkdir(lp_lockdir(), 0755);
1183
1184         if (is_daemon)
1185                 pidfile_create("smbd");
1186
1187         if (!reinit_after_fork(smbd_messaging_context(),
1188                                smbd_event_context(), false)) {
1189                 DEBUG(0,("reinit_after_fork() failed\n"));
1190                 exit(1);
1191         }
1192
1193         /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1194
1195         if (smbd_memcache() == NULL) {
1196                 exit(1);
1197         }
1198
1199         memcache_set_global(smbd_memcache());
1200
1201         /* Initialise the password backed before the global_sam_sid
1202            to ensure that we fetch from ldap before we make a domain sid up */
1203
1204         if(!initialize_password_db(False, smbd_event_context()))
1205                 exit(1);
1206
1207         if (!secrets_init()) {
1208                 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1209                 exit(1);
1210         }
1211
1212         if(!get_global_sam_sid()) {
1213                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1214                 exit(1);
1215         }
1216
1217         if (!session_init())
1218                 exit(1);
1219
1220         if (!connections_init(True))
1221                 exit(1);
1222
1223         if (!locking_init())
1224                 exit(1);
1225
1226         namecache_enable();
1227
1228         if (!W_ERROR_IS_OK(registry_init_full()))
1229                 exit(1);
1230
1231 #if 0
1232         if (!init_svcctl_db())
1233                 exit(1);
1234 #endif
1235
1236         if (!print_backend_init(smbd_messaging_context()))
1237                 exit(1);
1238
1239         if (!init_guest_info()) {
1240                 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1241                 return -1;
1242         }
1243
1244         /* only start the background queue daemon if we are
1245            running as a daemon -- bad things will happen if
1246            smbd is launched via inetd and we fork a copy of
1247            ourselves here */
1248
1249         if (is_daemon && !interactive
1250             && lp_parm_bool(-1, "smbd", "backgroundqueue", true)) {
1251                 start_background_queue();
1252         }
1253
1254         if (!open_sockets_smbd(is_daemon, interactive, ports))
1255                 exit(1);
1256
1257         TALLOC_FREE(frame);
1258
1259         smbd_process();
1260
1261         exit_server_cleanly(NULL);
1262         return(0);
1263 }