source3/nmbd/nmbd.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    NBT netbios routines and daemon - version 2
   4    Copyright (C) Andrew Tridgell 1994-1998
   5    Copyright (C) Jeremy Allison 1997-2002
   6    Copyright (C) Jelmer Vernooij 2002,2003 (Conversion to popt)
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20
  21 */
  22
  23 #include "includes.h"
  24
  25 int ClientNMB       = -1;
  26 int ClientDGRAM     = -1;
  27 int global_nmb_port = -1;
  28
  29 extern bool rescan_listen_set;
  30 extern bool global_in_nmbd;
  31
  32 extern bool override_logfile;
  33
  34 /* have we found LanMan clients yet? */
  35 bool found_lm_clients = False;
  36
  37 /* what server type are we currently */
  38
  39 time_t StartupTime = 0;
  40
  41 struct event_context *nmbd_event_context(void)
  42 {
  43         static struct event_context *ctx;
  44
  45         if (!ctx && !(ctx = event_context_init(NULL))) {
  46                 smb_panic("Could not init nmbd event context");
  47         }
  48         return ctx;
  49 }
  50
  51 struct messaging_context *nmbd_messaging_context(void)
  52 {
  53         static struct messaging_context *ctx;
  54
  55         if (ctx == NULL) {
  56                 ctx = messaging_init(NULL, server_id_self(),
  57                                      nmbd_event_context());
  58         }
  59         if (ctx == NULL) {
  60                 DEBUG(0, ("Could not init nmbd messaging context.\n"));
  61         }
  62         return ctx;
  63 }
  64
  65 /**************************************************************************** **
  66  Handle a SIGTERM in band.
  67  **************************************************************************** */
  68
  69 static void terminate(void)
  70 {
  71         DEBUG(0,("Got SIGTERM: going down...\n"));
  72
  73         /* Write out wins.dat file if samba is a WINS server */
  74         wins_write_database(0,False);
  75
  76         /* Remove all SELF registered names from WINS */
  77         release_wins_names();
  78
  79         /* Announce all server entries as 0 time-to-live, 0 type. */
  80         announce_my_servers_removed();
  81
  82         /* If there was an async dns child - kill it. */
  83         kill_async_dns_child();
  84
  85         exit(0);
  86 }
  87
  88 /**************************************************************************** **
  89  Handle a SHUTDOWN message from smbcontrol.
  90  **************************************************************************** */
  91
  92 static void nmbd_terminate(struct messaging_context *msg,
  93                            void *private_data,
  94                            uint32_t msg_type,
  95                            struct server_id server_id,
  96                            DATA_BLOB *data)
  97 {
  98         terminate();
  99 }
 100
 101 /**************************************************************************** **
 102  Catch a SIGTERM signal.
 103  **************************************************************************** */
 104
 105 static SIG_ATOMIC_T got_sig_term;
 106
 107 static void sig_term(int sig)
 108 {
 109         got_sig_term = 1;
 110         sys_select_signal(SIGTERM);
 111 }
 112
 113 /**************************************************************************** **
 114  Catch a SIGHUP signal.
 115  **************************************************************************** */
 116
 117 static SIG_ATOMIC_T reload_after_sighup;
 118
 119 static void sig_hup(int sig)
 120 {
 121         reload_after_sighup = 1;
 122         sys_select_signal(SIGHUP);
 123 }
 124
 125 /**************************************************************************** **
 126  Possibly continue after a fault.
 127  **************************************************************************** */
 128
 129 static void fault_continue(void)
 130 {
 131         dump_core();
 132 }
 133
 134 /**************************************************************************** **
 135  Expire old names from the namelist and server list.
 136  **************************************************************************** */
 137
 138 static void expire_names_and_servers(time_t t)
 139 {
 140         static time_t lastrun = 0;
 141
 142         if ( !lastrun )
 143                 lastrun = t;
 144         if ( t < (lastrun + 5) )
 145                 return;
 146         lastrun = t;
 147
 148         /*
 149          * Expire any timed out names on all the broadcast
 150          * subnets and those registered with the WINS server.
 151          * (nmbd_namelistdb.c)
 152          */
 153
 154         expire_names(t);
 155
 156         /*
 157          * Go through all the broadcast subnets and for each
 158          * workgroup known on that subnet remove any expired
 159          * server names. If a workgroup has an empty serverlist
 160          * and has itself timed out then remove the workgroup.
 161          * (nmbd_workgroupdb.c)
 162          */
 163
 164         expire_workgroups_and_servers(t);
 165 }
 166
 167 /************************************************************************** **
 168  Reload the list of network interfaces.
 169  Doesn't return until a network interface is up.
 170  ************************************************************************** */
 171
 172 static void reload_interfaces(time_t t)
 173 {
 174         static time_t lastt;
 175         int n;
 176         bool print_waiting_msg = true;
 177         struct subnet_record *subrec;
 178
 179         if (t && ((t - lastt) < NMBD_INTERFACES_RELOAD)) {
 180                 return;
 181         }
 182
 183         lastt = t;
 184
 185         if (!interfaces_changed()) {
 186                 return;
 187         }
 188
 189   try_again:
 190
 191         /* the list of probed interfaces has changed, we may need to add/remove
 192            some subnets */
 193         load_interfaces();
 194
 195         /* find any interfaces that need adding */
 196         for (n=iface_count() - 1; n >= 0; n--) {
 197                 char str[INET6_ADDRSTRLEN];
 198                 const struct interface *iface = get_interface(n);
 199                 struct in_addr ip, nmask;
 200
 201                 if (!iface) {
 202                         DEBUG(2,("reload_interfaces: failed to get interface %d\n", n));
 203                         continue;
 204                 }
 205
 206                 /* Ensure we're only dealing with IPv4 here. */
 207                 if (iface->ip.ss_family != AF_INET) {
 208                         DEBUG(2,("reload_interfaces: "
 209                                 "ignoring non IPv4 interface.\n"));
 210                         continue;
 211                 }
 212
 213                 ip = ((struct sockaddr_in *)&iface->ip)->sin_addr;
 214                 nmask = ((struct sockaddr_in *)&iface->netmask)->sin_addr;
 215
 216                 /*
 217                  * We don't want to add a loopback interface, in case
 218                  * someone has added 127.0.0.1 for smbd, nmbd needs to
 219                  * ignore it here. JRA.
 220                  */
 221
 222                 if (is_loopback_addr((struct sockaddr *)&iface->ip)) {
 223                         DEBUG(2,("reload_interfaces: Ignoring loopback "
 224                                 "interface %s\n",
 225                                 print_sockaddr(str, sizeof(str), &iface->ip) ));
 226                         continue;
 227                 }
 228
 229                 for (subrec=subnetlist; subrec; subrec=subrec->next) {
 230                         if (ip_equal_v4(ip, subrec->myip) &&
 231                             ip_equal_v4(nmask, subrec->mask_ip)) {
 232                                 break;
 233                         }
 234                 }
 235
 236                 if (!subrec) {
 237                         /* it wasn't found! add it */
 238                         DEBUG(2,("Found new interface %s\n",
 239                                  print_sockaddr(str,
 240                                          sizeof(str), &iface->ip) ));
 241                         subrec = make_normal_subnet(iface);
 242                         if (subrec)
 243                                 register_my_workgroup_one_subnet(subrec);
 244                 }
 245         }
 246
 247         /* find any interfaces that need deleting */
 248         for (subrec=subnetlist; subrec; subrec=subrec->next) {
 249                 for (n=iface_count() - 1; n >= 0; n--) {
 250                         struct interface *iface = get_interface(n);
 251                         struct in_addr ip, nmask;
 252                         if (!iface) {
 253                                 continue;
 254                         }
 255                         /* Ensure we're only dealing with IPv4 here. */
 256                         if (iface->ip.ss_family != AF_INET) {
 257                                 DEBUG(2,("reload_interfaces: "
 258                                         "ignoring non IPv4 interface.\n"));
 259                                 continue;
 260                         }
 261                         ip = ((struct sockaddr_in *)&iface->ip)->sin_addr;
 262                         nmask = ((struct sockaddr_in *)&iface->netmask)->sin_addr;
 263                         if (ip_equal_v4(ip, subrec->myip) &&
 264                             ip_equal_v4(nmask, subrec->mask_ip)) {
 265                                 break;
 266                         }
 267                 }
 268                 if (n == -1) {
 269                         /* oops, an interface has disapeared. This is
 270                          tricky, we don't dare actually free the
 271                          interface as it could be being used, so
 272                          instead we just wear the memory leak and
 273                          remove it from the list of interfaces without
 274                          freeing it */
 275                         DEBUG(2,("Deleting dead interface %s\n",
 276                                  inet_ntoa(subrec->myip)));
 277                         close_subnet(subrec);
 278                 }
 279         }
 280
 281         rescan_listen_set = True;
 282
 283         /* We need to wait if there are no subnets... */
 284         if (FIRST_SUBNET == NULL) {
 285
 286                 if (print_waiting_msg) {
 287                         DEBUG(0,("reload_interfaces: "
 288                                 "No subnets to listen to. Waiting..\n"));
 289                         print_waiting_msg = false;
 290                 }
 291
 292                 /*
 293                  * Whilst we're waiting for an interface, allow SIGTERM to
 294                  * cause us to exit.
 295                  */
 296
 297                 BlockSignals(false, SIGTERM);
 298
 299                 /* We only count IPv4, non-loopback interfaces here. */
 300                 while (iface_count_v4_nl() == 0 && !got_sig_term) {
 301                         sleep(5);
 302                         load_interfaces();
 303                 }
 304
 305                 /*
 306                  * Handle termination inband.
 307                  */
 308
 309                 if (got_sig_term) {
 310                         got_sig_term = 0;
 311                         terminate();
 312                 }
 313
 314                 /*
 315                  * We got an interface, go back to blocking term.
 316                  */
 317
 318                 BlockSignals(true, SIGTERM);
 319                 goto try_again;
 320         }
 321 }
 322
 323 /**************************************************************************** **
 324  Reload the services file.
 325  **************************************************************************** */
 326
 327 static bool reload_nmbd_services(bool test)
 328 {
 329         bool ret;
 330
 331         set_remote_machine_name("nmbd", False);
 332
 333         if ( lp_loaded() ) {
 334                 const char *fname = lp_configfile();
 335                 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
 336                         set_dyn_CONFIGFILE(fname);
 337                         test = False;
 338                 }
 339         }
 340
 341         if ( test && !lp_file_list_changed() )
 342                 return(True);
 343
 344         ret = lp_load(get_dyn_CONFIGFILE(), True , False, False, True);
 345
 346         /* perhaps the config filename is now set */
 347         if ( !test ) {
 348                 DEBUG( 3, ( "services not loaded\n" ) );
 349                 reload_nmbd_services( True );
 350         }
 351
 352         return(ret);
 353 }
 354
 355 /**************************************************************************** **
 356  * React on 'smbcontrol nmbd reload-config' in the same way as to SIGHUP
 357  **************************************************************************** */
 358
 359 static void msg_reload_nmbd_services(struct messaging_context *msg,
 360                                      void *private_data,
 361                                      uint32_t msg_type,
 362                                      struct server_id server_id,
 363                                      DATA_BLOB *data)
 364 {
 365         write_browse_list( 0, True );
 366         dump_all_namelists();
 367         reload_nmbd_services( True );
 368         reopen_logs();
 369         reload_interfaces(0);
 370 }
 371
 372 static void msg_nmbd_send_packet(struct messaging_context *msg,
 373                                  void *private_data,
 374                                  uint32_t msg_type,
 375                                  struct server_id src,
 376                                  DATA_BLOB *data)
 377 {
 378         struct packet_struct *p = (struct packet_struct *)data->data;
 379         struct subnet_record *subrec;
 380         struct sockaddr_storage ss;
 381         const struct sockaddr_storage *pss;
 382         const struct in_addr *local_ip;
 383
 384         DEBUG(10, ("Received send_packet from %d\n", procid_to_pid(&src)));
 385
 386         if (data->length != sizeof(struct packet_struct)) {
 387                 DEBUG(2, ("Discarding invalid packet length from %d\n",
 388                           procid_to_pid(&src)));
 389                 return;
 390         }
 391
 392         if ((p->packet_type != NMB_PACKET) &&
 393             (p->packet_type != DGRAM_PACKET)) {
 394                 DEBUG(2, ("Discarding invalid packet type from %d: %d\n",
 395                           procid_to_pid(&src), p->packet_type));
 396                 return;
 397         }
 398
 399         in_addr_to_sockaddr_storage(&ss, p->ip);
 400         pss = iface_ip((struct sockaddr *)&ss);
 401
 402         if (pss == NULL) {
 403                 DEBUG(2, ("Could not find ip for packet from %d\n",
 404                           procid_to_pid(&src)));
 405                 return;
 406         }
 407
 408         local_ip = &((const struct sockaddr_in *)pss)->sin_addr;
 409         subrec = FIRST_SUBNET;
 410
 411         p->fd = (p->packet_type == NMB_PACKET) ?
 412                 subrec->nmb_sock : subrec->dgram_sock;
 413
 414         for (subrec = FIRST_SUBNET; subrec != NULL;
 415              subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
 416                 if (ip_equal_v4(*local_ip, subrec->myip)) {
 417                         p->fd = (p->packet_type == NMB_PACKET) ?
 418                                 subrec->nmb_sock : subrec->dgram_sock;
 419                         break;
 420                 }
 421         }
 422
 423         if (p->packet_type == DGRAM_PACKET) {
 424                 p->port = 138;
 425                 p->packet.dgram.header.source_ip.s_addr = local_ip->s_addr;
 426                 p->packet.dgram.header.source_port = 138;
 427         }
 428
 429         send_packet(p);
 430 }
 431
 432 /**************************************************************************** **
 433  The main select loop.
 434  **************************************************************************** */
 435
 436 static void process(void)
 437 {
 438         bool run_election;
 439
 440         while( True ) {
 441                 time_t t = time(NULL);
 442                 TALLOC_CTX *frame = talloc_stackframe();
 443
 444                 /* Check for internal messages */
 445
 446                 message_dispatch(nmbd_messaging_context());
 447
 448                 /*
 449                  * Check all broadcast subnets to see if
 450                  * we need to run an election on any of them.
 451                  * (nmbd_elections.c)
 452                  */
 453
 454                 run_election = check_elections();
 455
 456                 /*
 457                  * Read incoming UDP packets.
 458                  * (nmbd_packets.c)
 459                  */
 460
 461                 if(listen_for_packets(run_election)) {
 462                         TALLOC_FREE(frame);
 463                         return;
 464                 }
 465
 466                 /*
 467                  * Handle termination inband.
 468                  */
 469
 470                 if (got_sig_term) {
 471                         got_sig_term = 0;
 472                         terminate();
 473                 }
 474
 475                 /*
 476                  * Process all incoming packets
 477                  * read above. This calls the success and
 478                  * failure functions registered when response
 479                  * packets arrrive, and also deals with request
 480                  * packets from other sources.
 481                  * (nmbd_packets.c)
 482                  */
 483
 484                 run_packet_queue();
 485
 486                 /*
 487                  * Run any elections - initiate becoming
 488                  * a local master browser if we have won.
 489                  * (nmbd_elections.c)
 490                  */
 491
 492                 run_elections(t);
 493
 494                 /*
 495                  * Send out any broadcast announcements
 496                  * of our server names. This also announces
 497                  * the workgroup name if we are a local
 498                  * master browser.
 499                  * (nmbd_sendannounce.c)
 500                  */
 501
 502                 announce_my_server_names(t);
 503
 504                 /*
 505                  * Send out any LanMan broadcast announcements
 506                  * of our server names.
 507                  * (nmbd_sendannounce.c)
 508                  */
 509
 510                 announce_my_lm_server_names(t);
 511
 512                 /*
 513                  * If we are a local master browser, periodically
 514                  * announce ourselves to the domain master browser.
 515                  * This also deals with syncronising the domain master
 516                  * browser server lists with ourselves as a local
 517                  * master browser.
 518                  * (nmbd_sendannounce.c)
 519                  */
 520
 521                 announce_myself_to_domain_master_browser(t);
 522
 523                 /*
 524                  * Fullfill any remote announce requests.
 525                  * (nmbd_sendannounce.c)
 526                  */
 527
 528                 announce_remote(t);
 529
 530                 /*
 531                  * Fullfill any remote browse sync announce requests.
 532                  * (nmbd_sendannounce.c)
 533                  */
 534
 535                 browse_sync_remote(t);
 536
 537                 /*
 538                  * Scan the broadcast subnets, and WINS client
 539                  * namelists and refresh any that need refreshing.
 540                  * (nmbd_mynames.c)
 541                  */
 542
 543                 refresh_my_names(t);
 544
 545                 /*
 546                  * Scan the subnet namelists and server lists and
 547                  * expire thos that have timed out.
 548                  * (nmbd.c)
 549                  */
 550
 551                 expire_names_and_servers(t);
 552
 553                 /*
 554                  * Write out a snapshot of our current browse list into
 555                  * the browse.dat file. This is used by smbd to service
 556                  * incoming NetServerEnum calls - used to synchronise
 557                  * browse lists over subnets.
 558                  * (nmbd_serverlistdb.c)
 559                  */
 560
 561                 write_browse_list(t, False);
 562
 563                 /*
 564                  * If we are a domain master browser, we have a list of
 565                  * local master browsers we should synchronise browse
 566                  * lists with (these are added by an incoming local
 567                  * master browser announcement packet). Expire any of
 568                  * these that are no longer current, and pull the server
 569                  * lists from each of these known local master browsers.
 570                  * (nmbd_browsesync.c)
 571                  */
 572
 573                 dmb_expire_and_sync_browser_lists(t);
 574
 575                 /*
 576                  * Check that there is a local master browser for our
 577                  * workgroup for all our broadcast subnets. If one
 578                  * is not found, start an election (which we ourselves
 579                  * may or may not participate in, depending on the
 580                  * setting of the 'local master' parameter.
 581                  * (nmbd_elections.c)
 582                  */
 583
 584                 check_master_browser_exists(t);
 585
 586                 /*
 587                  * If we are configured as a logon server, attempt to
 588                  * register the special NetBIOS names to become such
 589                  * (WORKGROUP<1c> name) on all broadcast subnets and
 590                  * with the WINS server (if used). If we are configured
 591                  * to become a domain master browser, attempt to register
 592                  * the special NetBIOS name (WORKGROUP<1b> name) to
 593                  * become such.
 594                  * (nmbd_become_dmb.c)
 595                  */
 596
 597                 add_domain_names(t);
 598
 599                 /*
 600                  * If we are a WINS server, do any timer dependent
 601                  * processing required.
 602                  * (nmbd_winsserver.c)
 603                  */
 604
 605                 initiate_wins_processing(t);
 606
 607                 /*
 608                  * If we are a domain master browser, attempt to contact the
 609                  * WINS server to get a list of all known WORKGROUPS/DOMAINS.
 610                  * This will only work to a Samba WINS server.
 611                  * (nmbd_browsesync.c)
 612                  */
 613
 614                 if (lp_enhanced_browsing())
 615                         collect_all_workgroup_names_from_wins_server(t);
 616
 617                 /*
 618                  * Go through the response record queue and time out or re-transmit
 619                  * and expired entries.
 620                  * (nmbd_packets.c)
 621                  */
 622
 623                 retransmit_or_expire_response_records(t);
 624
 625                 /*
 626                  * check to see if any remote browse sync child processes have completed
 627                  */
 628
 629                 sync_check_completion();
 630
 631                 /*
 632                  * regularly sync with any other DMBs we know about
 633                  */
 634
 635                 if (lp_enhanced_browsing())
 636                         sync_all_dmbs(t);
 637
 638                 /*
 639                  * clear the unexpected packet queue
 640                  */
 641
 642                 clear_unexpected(t);
 643
 644                 /*
 645                  * Reload the services file if we got a sighup.
 646                  */
 647
 648                 if(reload_after_sighup) {
 649                         DEBUG( 0, ( "Got SIGHUP dumping debug info.\n" ) );
 650                         msg_reload_nmbd_services(nmbd_messaging_context(),
 651                                                  NULL, MSG_SMB_CONF_UPDATED,
 652                                                  procid_self(), NULL);
 653
 654                         reload_after_sighup = 0;
 655                 }
 656
 657                 /* check for new network interfaces */
 658
 659                 reload_interfaces(t);
 660
 661                 /* free up temp memory */
 662                 TALLOC_FREE(frame);
 663         }
 664 }
 665
 666 /**************************************************************************** **
 667  Open the socket communication.
 668  **************************************************************************** */
 669
 670 static bool open_sockets(bool isdaemon, int port)
 671 {
 672         struct sockaddr_storage ss;
 673         const char *sock_addr = lp_socket_address();
 674
 675         /*
 676          * The sockets opened here will be used to receive broadcast
 677          * packets *only*. Interface specific sockets are opened in
 678          * make_subnet() in namedbsubnet.c. Thus we bind to the
 679          * address "0.0.0.0". The parameter 'socket address' is
 680          * now deprecated.
 681          */
 682
 683         if (!interpret_string_addr(&ss, sock_addr,
 684                                 AI_NUMERICHOST|AI_PASSIVE)) {
 685                 DEBUG(0,("open_sockets: unable to get socket address "
 686                         "from string %s", sock_addr));
 687                 return false;
 688         }
 689         if (ss.ss_family != AF_INET) {
 690                 DEBUG(0,("open_sockets: unable to use IPv6 socket"
 691                         "%s in nmbd\n",
 692                         sock_addr));
 693                 return false;
 694         }
 695
 696         if (isdaemon) {
 697                 ClientNMB = open_socket_in(SOCK_DGRAM, port,
 698                                            0, &ss,
 699                                            true);
 700         } else {
 701                 ClientNMB = 0;
 702         }
 703
 704         if (ClientNMB == -1) {
 705                 return false;
 706         }
 707
 708         ClientDGRAM = open_socket_in(SOCK_DGRAM, DGRAM_PORT,
 709                                            3, &ss,
 710                                            true);
 711
 712         if (ClientDGRAM == -1) {
 713                 if (ClientNMB != 0) {
 714                         close(ClientNMB);
 715                 }
 716                 return false;
 717         }
 718
 719         /* we are never interested in SIGPIPE */
 720         BlockSignals(True,SIGPIPE);
 721
 722         set_socket_options( ClientNMB,   "SO_BROADCAST" );
 723         set_socket_options( ClientDGRAM, "SO_BROADCAST" );
 724
 725         /* Ensure we're non-blocking. */
 726         set_blocking( ClientNMB, False);
 727         set_blocking( ClientDGRAM, False);
 728
 729         DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
 730         return( True );
 731 }
 732
 733 /**************************************************************************** **
 734  main program
 735  **************************************************************************** */
 736
 737  int main(int argc, const char *argv[])
 738 {
 739         static bool is_daemon;
 740         static bool opt_interactive;
 741         static bool Fork = true;
 742         static bool no_process_group;
 743         static bool log_stdout;
 744         poptContext pc;
 745         char *p_lmhosts = NULL;
 746         int opt;
 747         enum {
 748                 OPT_DAEMON = 1000,
 749                 OPT_INTERACTIVE,
 750                 OPT_FORK,
 751                 OPT_NO_PROCESS_GROUP,
 752                 OPT_LOG_STDOUT
 753         };
 754         struct poptOption long_options[] = {
 755         POPT_AUTOHELP
 756         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon(default)" },
 757         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)" },
 758         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools & etc)" },
 759         {"no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
 760         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
 761         {"hosts", 'H', POPT_ARG_STRING, &p_lmhosts, 'H', "Load a netbios hosts file"},
 762         {"port", 'p', POPT_ARG_INT, &global_nmb_port, NMB_PORT, "Listen on the specified port" },
 763         POPT_COMMON_SAMBA
 764         { NULL }
 765         };
 766         TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
 767
 768         load_case_tables();
 769
 770         global_nmb_port = NMB_PORT;
 771
 772         pc = poptGetContext("nmbd", argc, argv, long_options, 0);
 773         while ((opt = poptGetNextOpt(pc)) != -1) {
 774                 switch (opt) {
 775                 case OPT_DAEMON:
 776                         is_daemon = true;
 777                         break;
 778                 case OPT_INTERACTIVE:
 779                         opt_interactive = true;
 780                         break;
 781                 case OPT_FORK:
 782                         Fork = false;
 783                         break;
 784                 case OPT_NO_PROCESS_GROUP:
 785                         no_process_group = true;
 786                         break;
 787                 case OPT_LOG_STDOUT:
 788                         log_stdout = true;
 789                         break;
 790                 default:
 791                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
 792                                   poptBadOption(pc, 0), poptStrerror(opt));
 793                         poptPrintUsage(pc, stderr, 0);
 794                         exit(1);
 795                 }
 796         };
 797         poptFreeContext(pc);
 798
 799         global_in_nmbd = true;
 800
 801         StartupTime = time(NULL);
 802
 803         sys_srandom(time(NULL) ^ sys_getpid());
 804
 805         if (!override_logfile) {
 806                 char *lfile = NULL;
 807                 if (asprintf(&lfile, "%s/log.nmbd", get_dyn_LOGFILEBASE()) < 0) {
 808                         exit(1);
 809                 }
 810                 lp_set_logfile(lfile);
 811                 SAFE_FREE(lfile);
 812         }
 813
 814         fault_setup((void (*)(void *))fault_continue );
 815         dump_core_setup("nmbd");
 816
 817         /* POSIX demands that signals are inherited. If the invoking process has
 818          * these signals masked, we will have problems, as we won't receive them. */
 819         BlockSignals(False, SIGHUP);
 820         BlockSignals(False, SIGUSR1);
 821         BlockSignals(False, SIGTERM);
 822
 823         CatchSignal( SIGHUP,  SIGNAL_CAST sig_hup );
 824         CatchSignal( SIGTERM, SIGNAL_CAST sig_term );
 825
 826 #if defined(SIGFPE)
 827         /* we are never interested in SIGFPE */
 828         BlockSignals(True,SIGFPE);
 829 #endif
 830
 831         /* We no longer use USR2... */
 832 #if defined(SIGUSR2)
 833         BlockSignals(True, SIGUSR2);
 834 #endif
 835
 836         if ( opt_interactive ) {
 837                 Fork = False;
 838                 log_stdout = True;
 839         }
 840
 841         if ( log_stdout && Fork ) {
 842                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
 843                 exit(1);
 844         }
 845
 846         setup_logging( argv[0], log_stdout );
 847
 848         reopen_logs();
 849
 850         DEBUG(0,("nmbd version %s started.\n", SAMBA_VERSION_STRING));
 851         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
 852
 853         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
 854                 DEBUG(0, ("error opening config file\n"));
 855                 exit(1);
 856         }
 857
 858         if (nmbd_messaging_context() == NULL) {
 859                 return 1;
 860         }
 861
 862         if ( !reload_nmbd_services(False) )
 863                 return(-1);
 864
 865         if(!init_names())
 866                 return -1;
 867
 868         reload_nmbd_services( True );
 869
 870         if (strequal(lp_workgroup(),"*")) {
 871                 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
 872                 exit(1);
 873         }
 874
 875         set_samba_nb_type();
 876
 877         if (!is_daemon && !is_a_socket(0)) {
 878                 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
 879                 is_daemon = True;
 880         }
 881
 882         if (is_daemon && !opt_interactive) {
 883                 DEBUG( 2, ( "Becoming a daemon.\n" ) );
 884                 become_daemon(Fork, no_process_group);
 885         }
 886
 887 #if HAVE_SETPGID
 888         /*
 889          * If we're interactive we want to set our own process group for
 890          * signal management.
 891          */
 892         if (opt_interactive && !no_process_group)
 893                 setpgid( (pid_t)0, (pid_t)0 );
 894 #endif
 895
 896         if (nmbd_messaging_context() == NULL) {
 897                 return 1;
 898         }
 899
 900 #ifndef SYNC_DNS
 901         /* Setup the async dns. We do it here so it doesn't have all the other
 902                 stuff initialised and thus chewing memory and sockets */
 903         if(lp_we_are_a_wins_server() && lp_dns_proxy()) {
 904                 start_async_dns();
 905         }
 906 #endif
 907
 908         if (!directory_exist(lp_lockdir())) {
 909                 mkdir(lp_lockdir(), 0755);
 910         }
 911
 912         pidfile_create("nmbd");
 913
 914         if (!reinit_after_fork(nmbd_messaging_context(), false)) {
 915                 DEBUG(0,("reinit_after_fork() failed\n"));
 916                 exit(1);
 917         }
 918
 919         /* get broadcast messages */
 920         claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);
 921
 922         messaging_register(nmbd_messaging_context(), NULL,
 923                            MSG_FORCE_ELECTION, nmbd_message_election);
 924 #if 0
 925         /* Until winsrepl is done. */
 926         messaging_register(nmbd_messaging_context(), NULL,
 927                            MSG_WINS_NEW_ENTRY, nmbd_wins_new_entry);
 928 #endif
 929         messaging_register(nmbd_messaging_context(), NULL,
 930                            MSG_SHUTDOWN, nmbd_terminate);
 931         messaging_register(nmbd_messaging_context(), NULL,
 932                            MSG_SMB_CONF_UPDATED, msg_reload_nmbd_services);
 933         messaging_register(nmbd_messaging_context(), NULL,
 934                            MSG_SEND_PACKET, msg_nmbd_send_packet);
 935
 936         TimeInit();
 937
 938         DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port ) );
 939
 940         if ( !open_sockets( is_daemon, global_nmb_port ) ) {
 941                 kill_async_dns_child();
 942                 return 1;
 943         }
 944
 945         /* Determine all the IP addresses we have. */
 946         load_interfaces();
 947
 948         /* Create an nmbd subnet record for each of the above. */
 949         if( False == create_subnets() ) {
 950                 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
 951                 kill_async_dns_child();
 952                 exit(1);
 953         }
 954
 955         /* Load in any static local names. */
 956         if (p_lmhosts) {
 957                 set_dyn_LMHOSTSFILE(p_lmhosts);
 958         }
 959         load_lmhosts_file(get_dyn_LMHOSTSFILE());
 960         DEBUG(3,("Loaded hosts file %s\n", get_dyn_LMHOSTSFILE()));
 961
 962         /* If we are acting as a WINS server, initialise data structures. */
 963         if( !initialise_wins() ) {
 964                 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
 965                 kill_async_dns_child();
 966                 exit(1);
 967         }
 968
 969         /*
 970          * Register nmbd primary workgroup and nmbd names on all
 971          * the broadcast subnets, and on the WINS server (if specified).
 972          * Also initiate the startup of our primary workgroup (start
 973          * elections if we are setup as being able to be a local
 974          * master browser.
 975          */
 976
 977         if( False == register_my_workgroup_and_names() ) {
 978                 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
 979                 kill_async_dns_child();
 980                 exit(1);
 981         }
 982
 983         /* We can only take signals in the select. */
 984         BlockSignals( True, SIGTERM );
 985
 986         TALLOC_FREE(frame);
 987         process();
 988
 989         if (dbf)
 990                 x_fclose(dbf);
 991         kill_async_dns_child();
 992         return(0);
 993 }