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 2 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, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21
  22 */
  23
  24 #include "includes.h"
  25
  26 int ClientNMB       = -1;
  27 int ClientDGRAM     = -1;
  28 int global_nmb_port = -1;
  29
  30 extern BOOL rescan_listen_set;
  31 extern struct in_addr loopback_ip;
  32 extern BOOL global_in_nmbd;
  33
  34 extern BOOL override_logfile;
  35
  36 /* are we running as a daemon ? */
  37 static BOOL is_daemon;
  38
  39 /* fork or run in foreground ? */
  40 static BOOL Fork = True;
  41
  42 /* log to standard output ? */
  43 static BOOL log_stdout;
  44
  45 /* have we found LanMan clients yet? */
  46 BOOL found_lm_clients = False;
  47
  48 /* what server type are we currently */
  49
  50 time_t StartupTime = 0;
  51
  52 /**************************************************************************** **
  53  Handle a SIGTERM in band.
  54  **************************************************************************** */
  55
  56 static void terminate(void)
  57 {
  58         DEBUG(0,("Got SIGTERM: going down...\n"));
  59
  60         /* Write out wins.dat file if samba is a WINS server */
  61         wins_write_database(0,False);
  62
  63         /* Remove all SELF registered names from WINS */
  64         release_wins_names();
  65
  66         /* Announce all server entries as 0 time-to-live, 0 type. */
  67         announce_my_servers_removed();
  68
  69         /* If there was an async dns child - kill it. */
  70         kill_async_dns_child();
  71
  72         exit(0);
  73 }
  74
  75 /**************************************************************************** **
  76  Handle a SHUTDOWN message from smbcontrol.
  77  **************************************************************************** */
  78
  79 static void nmbd_terminate(int msg_type, struct process_id src,
  80                            void *buf, size_t len)
  81 {
  82         terminate();
  83 }
  84
  85 /**************************************************************************** **
  86  Catch a SIGTERM signal.
  87  **************************************************************************** */
  88
  89 static SIG_ATOMIC_T got_sig_term;
  90
  91 static void sig_term(int sig)
  92 {
  93         got_sig_term = 1;
  94         sys_select_signal(SIGTERM);
  95 }
  96
  97 /**************************************************************************** **
  98  Catch a SIGHUP signal.
  99  **************************************************************************** */
 100
 101 static SIG_ATOMIC_T reload_after_sighup;
 102
 103 static void sig_hup(int sig)
 104 {
 105         reload_after_sighup = 1;
 106         sys_select_signal(SIGHUP);
 107 }
 108
 109 /**************************************************************************** **
 110  Possibly continue after a fault.
 111  **************************************************************************** */
 112
 113 static void fault_continue(void)
 114 {
 115 #if DUMP_CORE
 116         dump_core();
 117 #endif
 118 }
 119
 120 /**************************************************************************** **
 121  Expire old names from the namelist and server list.
 122  **************************************************************************** */
 123
 124 static void expire_names_and_servers(time_t t)
 125 {
 126         static time_t lastrun = 0;
 127
 128         if ( !lastrun )
 129                 lastrun = t;
 130         if ( t < (lastrun + 5) )
 131                 return;
 132         lastrun = t;
 133
 134         /*
 135          * Expire any timed out names on all the broadcast
 136          * subnets and those registered with the WINS server.
 137          * (nmbd_namelistdb.c)
 138          */
 139
 140         expire_names(t);
 141
 142         /*
 143          * Go through all the broadcast subnets and for each
 144          * workgroup known on that subnet remove any expired
 145          * server names. If a workgroup has an empty serverlist
 146          * and has itself timed out then remove the workgroup.
 147          * (nmbd_workgroupdb.c)
 148          */
 149
 150         expire_workgroups_and_servers(t);
 151 }
 152
 153 /************************************************************************** **
 154  Reload the list of network interfaces.
 155  ************************************************************************** */
 156
 157 static BOOL reload_interfaces(time_t t)
 158 {
 159         static time_t lastt;
 160         int n;
 161         struct subnet_record *subrec;
 162
 163         if (t && ((t - lastt) < NMBD_INTERFACES_RELOAD)) return False;
 164         lastt = t;
 165
 166         if (!interfaces_changed()) return False;
 167
 168         /* the list of probed interfaces has changed, we may need to add/remove
 169            some subnets */
 170         load_interfaces();
 171
 172         /* find any interfaces that need adding */
 173         for (n=iface_count() - 1; n >= 0; n--) {
 174                 struct interface *iface = get_interface(n);
 175
 176                 /*
 177                  * We don't want to add a loopback interface, in case
 178                  * someone has added 127.0.0.1 for smbd, nmbd needs to
 179                  * ignore it here. JRA.
 180                  */
 181
 182                 if (ip_equal(iface->ip, loopback_ip)) {
 183                         DEBUG(2,("reload_interfaces: Ignoring loopback interface %s\n", inet_ntoa(iface->ip)));
 184                         continue;
 185                 }
 186
 187                 for (subrec=subnetlist; subrec; subrec=subrec->next) {
 188                         if (ip_equal(iface->ip, subrec->myip) &&
 189                             ip_equal(iface->nmask, subrec->mask_ip)) break;
 190                 }
 191
 192                 if (!subrec) {
 193                         /* it wasn't found! add it */
 194                         DEBUG(2,("Found new interface %s\n",
 195                                  inet_ntoa(iface->ip)));
 196                         subrec = make_normal_subnet(iface);
 197                         if (subrec)
 198                                 register_my_workgroup_one_subnet(subrec);
 199                 }
 200         }
 201
 202         /* find any interfaces that need deleting */
 203         for (subrec=subnetlist; subrec; subrec=subrec->next) {
 204                 for (n=iface_count() - 1; n >= 0; n--) {
 205                         struct interface *iface = get_interface(n);
 206                         if (ip_equal(iface->ip, subrec->myip) &&
 207                             ip_equal(iface->nmask, subrec->mask_ip)) break;
 208                 }
 209                 if (n == -1) {
 210                         /* oops, an interface has disapeared. This is
 211                          tricky, we don't dare actually free the
 212                          interface as it could be being used, so
 213                          instead we just wear the memory leak and
 214                          remove it from the list of interfaces without
 215                          freeing it */
 216                         DEBUG(2,("Deleting dead interface %s\n",
 217                                  inet_ntoa(subrec->myip)));
 218                         close_subnet(subrec);
 219                 }
 220         }
 221
 222         rescan_listen_set = True;
 223
 224         /* We need to shutdown if there are no subnets... */
 225         if (FIRST_SUBNET == NULL) {
 226                 DEBUG(0,("reload_interfaces: No subnets to listen to. Shutting down...\n"));
 227                 return True;
 228         }
 229         return False;
 230 }
 231
 232 /**************************************************************************** **
 233  Reload the services file.
 234  **************************************************************************** */
 235
 236 static BOOL reload_nmbd_services(BOOL test)
 237 {
 238         BOOL ret;
 239
 240         set_remote_machine_name("nmbd", False);
 241
 242         if ( lp_loaded() ) {
 243                 pstring fname;
 244                 pstrcpy( fname,lp_configfile());
 245                 if (file_exist(fname,NULL) && !strcsequal(fname,dyn_CONFIGFILE)) {
 246                         pstrcpy(dyn_CONFIGFILE,fname);
 247                         test = False;
 248                 }
 249         }
 250
 251         if ( test && !lp_file_list_changed() )
 252                 return(True);
 253
 254         ret = lp_load( dyn_CONFIGFILE, True , False, False, True);
 255
 256         /* perhaps the config filename is now set */
 257         if ( !test ) {
 258                 DEBUG( 3, ( "services not loaded\n" ) );
 259                 reload_nmbd_services( True );
 260         }
 261
 262         return(ret);
 263 }
 264
 265 /**************************************************************************** **
 266  * React on 'smbcontrol nmbd reload-config' in the same way as to SIGHUP
 267  * We use buf here to return BOOL result to process() when reload_interfaces()
 268  * detects that there are no subnets.
 269  **************************************************************************** */
 270
 271 static void msg_reload_nmbd_services(int msg_type, struct process_id src,
 272                                      void *buf, size_t len)
 273 {
 274         write_browse_list( 0, True );
 275         dump_all_namelists();
 276         reload_nmbd_services( True );
 277         reopen_logs();
 278
 279         if(buf) {
 280                 /* We were called from process() */
 281                 /* If reload_interfaces() returned True */
 282                 /* we need to shutdown if there are no subnets... */
 283                 /* pass this info back to process() */
 284                 *((BOOL*)buf) = reload_interfaces(0);
 285         }
 286 }
 287
 288 static void msg_nmbd_send_packet(int msg_type, struct process_id src,
 289                                  void *buf, size_t len)
 290 {
 291         struct packet_struct *p = (struct packet_struct *)buf;
 292         struct subnet_record *subrec;
 293         struct in_addr *local_ip;
 294
 295         DEBUG(10, ("Received send_packet from %d\n", procid_to_pid(&src)));
 296
 297         if (len != sizeof(struct packet_struct)) {
 298                 DEBUG(2, ("Discarding invalid packet length from %d\n",
 299                           procid_to_pid(&src)));
 300                 return;
 301         }
 302
 303         if ((p->packet_type != NMB_PACKET) &&
 304             (p->packet_type != DGRAM_PACKET)) {
 305                 DEBUG(2, ("Discarding invalid packet type from %d: %d\n",
 306                           procid_to_pid(&src), p->packet_type));
 307                 return;
 308         }
 309
 310         local_ip = iface_ip(p->ip);
 311
 312         if (local_ip == NULL) {
 313                 DEBUG(2, ("Could not find ip for packet from %d\n",
 314                           procid_to_pid(&src)));
 315                 return;
 316         }
 317
 318         subrec = FIRST_SUBNET;
 319
 320         p->fd = (p->packet_type == NMB_PACKET) ?
 321                 subrec->nmb_sock : subrec->dgram_sock;
 322
 323         for (subrec = FIRST_SUBNET; subrec != NULL;
 324              subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
 325                 if (ip_equal(*local_ip, subrec->myip)) {
 326                         p->fd = (p->packet_type == NMB_PACKET) ?
 327                                 subrec->nmb_sock : subrec->dgram_sock;
 328                         break;
 329                 }
 330         }
 331
 332         if (p->packet_type == DGRAM_PACKET) {
 333                 p->port = 138;
 334                 p->packet.dgram.header.source_ip.s_addr = local_ip->s_addr;
 335                 p->packet.dgram.header.source_port = 138;
 336         }
 337
 338         send_packet(p);
 339 }
 340
 341 /**************************************************************************** **
 342  The main select loop.
 343  **************************************************************************** */
 344
 345 static void process(void)
 346 {
 347         BOOL run_election;
 348         BOOL no_subnets;
 349
 350         while( True ) {
 351                 time_t t = time(NULL);
 352
 353                 /* Check for internal messages */
 354
 355                 message_dispatch();
 356
 357                 /*
 358                  * Check all broadcast subnets to see if
 359                  * we need to run an election on any of them.
 360                  * (nmbd_elections.c)
 361                  */
 362
 363                 run_election = check_elections();
 364
 365                 /*
 366                  * Read incoming UDP packets.
 367                  * (nmbd_packets.c)
 368                  */
 369
 370                 if(listen_for_packets(run_election))
 371                         return;
 372
 373                 /*
 374                  * Handle termination inband.
 375                  */
 376
 377                 if (got_sig_term) {
 378                         got_sig_term = 0;
 379                         terminate();
 380                 }
 381
 382                 /*
 383                  * Process all incoming packets
 384                  * read above. This calls the success and
 385                  * failure functions registered when response
 386                  * packets arrrive, and also deals with request
 387                  * packets from other sources.
 388                  * (nmbd_packets.c)
 389                  */
 390
 391                 run_packet_queue();
 392
 393                 /*
 394                  * Run any elections - initiate becoming
 395                  * a local master browser if we have won.
 396                  * (nmbd_elections.c)
 397                  */
 398
 399                 run_elections(t);
 400
 401                 /*
 402                  * Send out any broadcast announcements
 403                  * of our server names. This also announces
 404                  * the workgroup name if we are a local
 405                  * master browser.
 406                  * (nmbd_sendannounce.c)
 407                  */
 408
 409                 announce_my_server_names(t);
 410
 411                 /*
 412                  * Send out any LanMan broadcast announcements
 413                  * of our server names.
 414                  * (nmbd_sendannounce.c)
 415                  */
 416
 417                 announce_my_lm_server_names(t);
 418
 419                 /*
 420                  * If we are a local master browser, periodically
 421                  * announce ourselves to the domain master browser.
 422                  * This also deals with syncronising the domain master
 423                  * browser server lists with ourselves as a local
 424                  * master browser.
 425                  * (nmbd_sendannounce.c)
 426                  */
 427
 428                 announce_myself_to_domain_master_browser(t);
 429
 430                 /*
 431                  * Fullfill any remote announce requests.
 432                  * (nmbd_sendannounce.c)
 433                  */
 434
 435                 announce_remote(t);
 436
 437                 /*
 438                  * Fullfill any remote browse sync announce requests.
 439                  * (nmbd_sendannounce.c)
 440                  */
 441
 442                 browse_sync_remote(t);
 443
 444                 /*
 445                  * Scan the broadcast subnets, and WINS client
 446                  * namelists and refresh any that need refreshing.
 447                  * (nmbd_mynames.c)
 448                  */
 449
 450                 refresh_my_names(t);
 451
 452                 /*
 453                  * Scan the subnet namelists and server lists and
 454                  * expire thos that have timed out.
 455                  * (nmbd.c)
 456                  */
 457
 458                 expire_names_and_servers(t);
 459
 460                 /*
 461                  * Write out a snapshot of our current browse list into
 462                  * the browse.dat file. This is used by smbd to service
 463                  * incoming NetServerEnum calls - used to synchronise
 464                  * browse lists over subnets.
 465                  * (nmbd_serverlistdb.c)
 466                  */
 467
 468                 write_browse_list(t, False);
 469
 470                 /*
 471                  * If we are a domain master browser, we have a list of
 472                  * local master browsers we should synchronise browse
 473                  * lists with (these are added by an incoming local
 474                  * master browser announcement packet). Expire any of
 475                  * these that are no longer current, and pull the server
 476                  * lists from each of these known local master browsers.
 477                  * (nmbd_browsesync.c)
 478                  */
 479
 480                 dmb_expire_and_sync_browser_lists(t);
 481
 482                 /*
 483                  * Check that there is a local master browser for our
 484                  * workgroup for all our broadcast subnets. If one
 485                  * is not found, start an election (which we ourselves
 486                  * may or may not participate in, depending on the
 487                  * setting of the 'local master' parameter.
 488                  * (nmbd_elections.c)
 489                  */
 490
 491                 check_master_browser_exists(t);
 492
 493                 /*
 494                  * If we are configured as a logon server, attempt to
 495                  * register the special NetBIOS names to become such
 496                  * (WORKGROUP<1c> name) on all broadcast subnets and
 497                  * with the WINS server (if used). If we are configured
 498                  * to become a domain master browser, attempt to register
 499                  * the special NetBIOS name (WORKGROUP<1b> name) to
 500                  * become such.
 501                  * (nmbd_become_dmb.c)
 502                  */
 503
 504                 add_domain_names(t);
 505
 506                 /*
 507                  * If we are a WINS server, do any timer dependent
 508                  * processing required.
 509                  * (nmbd_winsserver.c)
 510                  */
 511
 512                 initiate_wins_processing(t);
 513
 514                 /*
 515                  * If we are a domain master browser, attempt to contact the
 516                  * WINS server to get a list of all known WORKGROUPS/DOMAINS.
 517                  * This will only work to a Samba WINS server.
 518                  * (nmbd_browsesync.c)
 519                  */
 520
 521                 if (lp_enhanced_browsing())
 522                         collect_all_workgroup_names_from_wins_server(t);
 523
 524                 /*
 525                  * Go through the response record queue and time out or re-transmit
 526                  * and expired entries.
 527                  * (nmbd_packets.c)
 528                  */
 529
 530                 retransmit_or_expire_response_records(t);
 531
 532                 /*
 533                  * check to see if any remote browse sync child processes have completed
 534                  */
 535
 536                 sync_check_completion();
 537
 538                 /*
 539                  * regularly sync with any other DMBs we know about
 540                  */
 541
 542                 if (lp_enhanced_browsing())
 543                         sync_all_dmbs(t);
 544
 545                 /*
 546                  * clear the unexpected packet queue
 547                  */
 548
 549                 clear_unexpected(t);
 550
 551                 /*
 552                  * Reload the services file if we got a sighup.
 553                  */
 554
 555                 if(reload_after_sighup) {
 556                         DEBUG( 0, ( "Got SIGHUP dumping debug info.\n" ) );
 557                         msg_reload_nmbd_services(MSG_SMB_CONF_UPDATED,
 558                                                  pid_to_procid(0), (void*) &no_subnets, 0);
 559                         if(no_subnets)
 560                                 return;
 561                         reload_after_sighup = 0;
 562                 }
 563
 564                 /* check for new network interfaces */
 565
 566                 if(reload_interfaces(t))
 567                         return;
 568
 569                 /* free up temp memory */
 570                         lp_TALLOC_FREE();
 571         }
 572 }
 573
 574 /**************************************************************************** **
 575  Open the socket communication.
 576  **************************************************************************** */
 577
 578 static BOOL open_sockets(BOOL isdaemon, int port)
 579 {
 580         /*
 581          * The sockets opened here will be used to receive broadcast
 582          * packets *only*. Interface specific sockets are opened in
 583          * make_subnet() in namedbsubnet.c. Thus we bind to the
 584          * address "0.0.0.0". The parameter 'socket address' is
 585          * now deprecated.
 586          */
 587
 588         if ( isdaemon )
 589                 ClientNMB = open_socket_in(SOCK_DGRAM, port,
 590                                            0, interpret_addr(lp_socket_address()),
 591                                            True);
 592         else
 593                 ClientNMB = 0;
 594
 595         ClientDGRAM = open_socket_in(SOCK_DGRAM, DGRAM_PORT,
 596                                            3, interpret_addr(lp_socket_address()),
 597                                            True);
 598
 599         if ( ClientNMB == -1 )
 600                 return( False );
 601
 602         /* we are never interested in SIGPIPE */
 603         BlockSignals(True,SIGPIPE);
 604
 605         set_socket_options( ClientNMB,   "SO_BROADCAST" );
 606         set_socket_options( ClientDGRAM, "SO_BROADCAST" );
 607
 608         /* Ensure we're non-blocking. */
 609         set_blocking( ClientNMB, False);
 610         set_blocking( ClientDGRAM, False);
 611
 612         DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
 613         return( True );
 614 }
 615
 616 /**************************************************************************** **
 617  main program
 618  **************************************************************************** */
 619  int main(int argc, const char *argv[])
 620 {
 621         pstring logfile;
 622         static BOOL opt_interactive;
 623         poptContext pc;
 624         static char *p_lmhosts = dyn_LMHOSTSFILE;
 625         static BOOL no_process_group = False;
 626         struct poptOption long_options[] = {
 627         POPT_AUTOHELP
 628         {"daemon", 'D', POPT_ARG_VAL, &is_daemon, True, "Become a daemon(default)" },
 629         {"interactive", 'i', POPT_ARG_VAL, &opt_interactive, True, "Run interactive (not a daemon)" },
 630         {"foreground", 'F', POPT_ARG_VAL, &Fork, False, "Run daemon in foreground (for daemontools & etc)" },
 631         {"no-process-group", 0, POPT_ARG_VAL, &no_process_group, True, "Don't create a new process group" },
 632         {"log-stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
 633         {"hosts", 'H', POPT_ARG_STRING, &p_lmhosts, 'H', "Load a netbios hosts file"},
 634         {"port", 'p', POPT_ARG_INT, &global_nmb_port, NMB_PORT, "Listen on the specified port" },
 635         POPT_COMMON_SAMBA
 636         { NULL }
 637         };
 638
 639         load_case_tables();
 640
 641         global_nmb_port = NMB_PORT;
 642
 643         pc = poptGetContext("nmbd", argc, argv, long_options, 0);
 644         while (poptGetNextOpt(pc) != -1) {};
 645         poptFreeContext(pc);
 646
 647         global_in_nmbd = True;
 648
 649         StartupTime = time(NULL);
 650
 651         sys_srandom(time(NULL) ^ sys_getpid());
 652
 653         if (!override_logfile) {
 654                 slprintf(logfile, sizeof(logfile)-1, "%s/log.nmbd", dyn_LOGFILEBASE);
 655                 lp_set_logfile(logfile);
 656         }
 657
 658         fault_setup((void (*)(void *))fault_continue );
 659         dump_core_setup("nmbd");
 660
 661         /* POSIX demands that signals are inherited. If the invoking process has
 662          * these signals masked, we will have problems, as we won't receive them. */
 663         BlockSignals(False, SIGHUP);
 664         BlockSignals(False, SIGUSR1);
 665         BlockSignals(False, SIGTERM);
 666
 667         CatchSignal( SIGHUP,  SIGNAL_CAST sig_hup );
 668         CatchSignal( SIGTERM, SIGNAL_CAST sig_term );
 669
 670 #if defined(SIGFPE)
 671         /* we are never interested in SIGFPE */
 672         BlockSignals(True,SIGFPE);
 673 #endif
 674
 675         /* We no longer use USR2... */
 676 #if defined(SIGUSR2)
 677         BlockSignals(True, SIGUSR2);
 678 #endif
 679
 680         if ( opt_interactive ) {
 681                 Fork = False;
 682                 log_stdout = True;
 683         }
 684
 685         if ( log_stdout && Fork ) {
 686                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
 687                 exit(1);
 688         }
 689
 690         setup_logging( argv[0], log_stdout );
 691
 692         reopen_logs();
 693
 694         DEBUG( 0, ( "Netbios nameserver version %s started.\n", SAMBA_VERSION_STRING) );
 695         DEBUGADD( 0, ( "%s\n", COPYRIGHT_STARTUP_MESSAGE ) );
 696
 697         if ( !reload_nmbd_services(False) )
 698                 return(-1);
 699
 700         if(!init_names())
 701                 return -1;
 702
 703         reload_nmbd_services( True );
 704
 705         if (strequal(lp_workgroup(),"*")) {
 706                 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
 707                 exit(1);
 708         }
 709
 710         set_samba_nb_type();
 711
 712         if (!is_daemon && !is_a_socket(0)) {
 713                 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
 714                 is_daemon = True;
 715         }
 716
 717         if (is_daemon && !opt_interactive) {
 718                 DEBUG( 2, ( "Becoming a daemon.\n" ) );
 719                 become_daemon(Fork, no_process_group);
 720         }
 721
 722 #if HAVE_SETPGID
 723         /*
 724          * If we're interactive we want to set our own process group for
 725          * signal management.
 726          */
 727         if (opt_interactive && !no_process_group)
 728                 setpgid( (pid_t)0, (pid_t)0 );
 729 #endif
 730
 731 #ifndef SYNC_DNS
 732         /* Setup the async dns. We do it here so it doesn't have all the other
 733                 stuff initialised and thus chewing memory and sockets */
 734         if(lp_we_are_a_wins_server() && lp_dns_proxy()) {
 735                 start_async_dns();
 736         }
 737 #endif
 738
 739         if (!directory_exist(lp_lockdir(), NULL)) {
 740                 mkdir(lp_lockdir(), 0755);
 741         }
 742
 743         pidfile_create("nmbd");
 744         message_init();
 745         message_register(MSG_FORCE_ELECTION, nmbd_message_election);
 746 #if 0
 747         /* Until winsrepl is done. */
 748         message_register(MSG_WINS_NEW_ENTRY, nmbd_wins_new_entry);
 749 #endif
 750         message_register(MSG_SHUTDOWN, nmbd_terminate);
 751         message_register(MSG_SMB_CONF_UPDATED, msg_reload_nmbd_services);
 752         message_register(MSG_SEND_PACKET, msg_nmbd_send_packet);
 753
 754         TimeInit();
 755
 756         DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port ) );
 757
 758         if ( !open_sockets( is_daemon, global_nmb_port ) ) {
 759                 kill_async_dns_child();
 760                 return 1;
 761         }
 762
 763         /* Determine all the IP addresses we have. */
 764         load_interfaces();
 765
 766         /* Create an nmbd subnet record for each of the above. */
 767         if( False == create_subnets() ) {
 768                 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
 769                 kill_async_dns_child();
 770                 exit(1);
 771         }
 772
 773         /* Load in any static local names. */
 774         load_lmhosts_file(p_lmhosts);
 775         DEBUG(3,("Loaded hosts file %s\n", p_lmhosts));
 776
 777         /* If we are acting as a WINS server, initialise data structures. */
 778         if( !initialise_wins() ) {
 779                 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
 780                 kill_async_dns_child();
 781                 exit(1);
 782         }
 783
 784         /*
 785          * Register nmbd primary workgroup and nmbd names on all
 786          * the broadcast subnets, and on the WINS server (if specified).
 787          * Also initiate the startup of our primary workgroup (start
 788          * elections if we are setup as being able to be a local
 789          * master browser.
 790          */
 791
 792         if( False == register_my_workgroup_and_names() ) {
 793                 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
 794                 kill_async_dns_child();
 795                 exit(1);
 796         }
 797
 798         /* We can only take signals in the select. */
 799         BlockSignals( True, SIGTERM );
 800
 801         process();
 802
 803         if (dbf)
 804                 x_fclose(dbf);
 805         kill_async_dns_child();
 806         return(0);
 807 }