source/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, void *private_data)
  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         dump_core();
 116 }
 117
 118 /**************************************************************************** **
 119  Expire old names from the namelist and server list.
 120  **************************************************************************** */
 121
 122 static void expire_names_and_servers(time_t t)
 123 {
 124         static time_t lastrun = 0;
 125
 126         if ( !lastrun )
 127                 lastrun = t;
 128         if ( t < (lastrun + 5) )
 129                 return;
 130         lastrun = t;
 131
 132         /*
 133          * Expire any timed out names on all the broadcast
 134          * subnets and those registered with the WINS server.
 135          * (nmbd_namelistdb.c)
 136          */
 137
 138         expire_names(t);
 139
 140         /*
 141          * Go through all the broadcast subnets and for each
 142          * workgroup known on that subnet remove any expired
 143          * server names. If a workgroup has an empty serverlist
 144          * and has itself timed out then remove the workgroup.
 145          * (nmbd_workgroupdb.c)
 146          */
 147
 148         expire_workgroups_and_servers(t);
 149 }
 150
 151 /************************************************************************** **
 152  Reload the list of network interfaces.
 153  Doesn't return until a network interface is up.
 154  ************************************************************************** */
 155
 156 static void reload_interfaces(time_t t)
 157 {
 158         static time_t lastt;
 159         int n;
 160         struct subnet_record *subrec;
 161
 162         if (t && ((t - lastt) < NMBD_INTERFACES_RELOAD)) {
 163                 return;
 164         }
 165         lastt = t;
 166
 167         if (!interfaces_changed()) {
 168                 return;
 169         }
 170
 171         /* the list of probed interfaces has changed, we may need to add/remove
 172            some subnets */
 173         load_interfaces();
 174
 175   try_again:
 176
 177         /* find any interfaces that need adding */
 178         for (n=iface_count() - 1; n >= 0; n--) {
 179                 struct interface *iface = get_interface(n);
 180
 181                 if (!iface) {
 182                         DEBUG(2,("reload_interfaces: failed to get interface %d\n", n));
 183                         continue;
 184                 }
 185
 186                 /*
 187                  * We don't want to add a loopback interface, in case
 188                  * someone has added 127.0.0.1 for smbd, nmbd needs to
 189                  * ignore it here. JRA.
 190                  */
 191
 192                 if (ip_equal(iface->ip, loopback_ip)) {
 193                         DEBUG(2,("reload_interfaces: Ignoring loopback interface %s\n", inet_ntoa(iface->ip)));
 194                         continue;
 195                 }
 196
 197                 for (subrec=subnetlist; subrec; subrec=subrec->next) {
 198                         if (ip_equal(iface->ip, subrec->myip) &&
 199                             ip_equal(iface->nmask, subrec->mask_ip)) break;
 200                 }
 201
 202                 if (!subrec) {
 203                         /* it wasn't found! add it */
 204                         DEBUG(2,("Found new interface %s\n",
 205                                  inet_ntoa(iface->ip)));
 206                         subrec = make_normal_subnet(iface);
 207                         if (subrec)
 208                                 register_my_workgroup_one_subnet(subrec);
 209                 }
 210         }
 211
 212         /* find any interfaces that need deleting */
 213         for (subrec=subnetlist; subrec; subrec=subrec->next) {
 214                 for (n=iface_count() - 1; n >= 0; n--) {
 215                         struct interface *iface = get_interface(n);
 216                         if (ip_equal(iface->ip, subrec->myip) &&
 217                             ip_equal(iface->nmask, subrec->mask_ip)) break;
 218                 }
 219                 if (n == -1) {
 220                         /* oops, an interface has disapeared. This is
 221                          tricky, we don't dare actually free the
 222                          interface as it could be being used, so
 223                          instead we just wear the memory leak and
 224                          remove it from the list of interfaces without
 225                          freeing it */
 226                         DEBUG(2,("Deleting dead interface %s\n",
 227                                  inet_ntoa(subrec->myip)));
 228                         close_subnet(subrec);
 229                 }
 230         }
 231
 232         rescan_listen_set = True;
 233
 234         /* We need to wait if there are no subnets... */
 235         if (FIRST_SUBNET == NULL) {
 236                 void (*saved_handler)(int);
 237
 238                 DEBUG(2,("reload_interfaces: "
 239                         "No subnets to listen to. Waiting..\n"));
 240
 241                 /*
 242                  * Whilst we're waiting for an interface, allow SIGTERM to
 243                  * cause us to exit.
 244                  */
 245
 246                 saved_handler = CatchSignal( SIGTERM, SIGNAL_CAST SIG_DFL );
 247
 248                 while (iface_count() == 0) {
 249                         sleep(5);
 250                         load_interfaces();
 251                 }
 252
 253                 /*
 254                  * We got an interface, restore our normal term handler.
 255                  */
 256
 257                 CatchSignal( SIGTERM, SIGNAL_CAST saved_handler );
 258                 goto try_again;
 259         }
 260 }
 261
 262 /**************************************************************************** **
 263  Reload the services file.
 264  **************************************************************************** */
 265
 266 static BOOL reload_nmbd_services(BOOL test)
 267 {
 268         BOOL ret;
 269
 270         set_remote_machine_name("nmbd", False);
 271
 272         if ( lp_loaded() ) {
 273                 pstring fname;
 274                 pstrcpy( fname,lp_configfile());
 275                 if (file_exist(fname,NULL) && !strcsequal(fname,dyn_CONFIGFILE)) {
 276                         pstrcpy(dyn_CONFIGFILE,fname);
 277                         test = False;
 278                 }
 279         }
 280
 281         if ( test && !lp_file_list_changed() )
 282                 return(True);
 283
 284         ret = lp_load( dyn_CONFIGFILE, True , False, False, True);
 285
 286         /* perhaps the config filename is now set */
 287         if ( !test ) {
 288                 DEBUG( 3, ( "services not loaded\n" ) );
 289                 reload_nmbd_services( True );
 290         }
 291
 292         return(ret);
 293 }
 294
 295 /**************************************************************************** **
 296  * React on 'smbcontrol nmbd reload-config' in the same way as to SIGHUP
 297  **************************************************************************** */
 298
 299 static void msg_reload_nmbd_services(int msg_type, struct process_id src,
 300                                      void *buf, size_t len, void *private_data)
 301 {
 302         write_browse_list( 0, True );
 303         dump_all_namelists();
 304         reload_nmbd_services( True );
 305         reopen_logs();
 306         reload_interfaces(0);
 307 }
 308
 309 static void msg_nmbd_send_packet(int msg_type, struct process_id src,
 310                                  void *buf, size_t len, void *private_data)
 311 {
 312         struct packet_struct *p = (struct packet_struct *)buf;
 313         struct subnet_record *subrec;
 314         struct in_addr *local_ip;
 315
 316         DEBUG(10, ("Received send_packet from %d\n", procid_to_pid(&src)));
 317
 318         if (len != sizeof(struct packet_struct)) {
 319                 DEBUG(2, ("Discarding invalid packet length from %d\n",
 320                           procid_to_pid(&src)));
 321                 return;
 322         }
 323
 324         if ((p->packet_type != NMB_PACKET) &&
 325             (p->packet_type != DGRAM_PACKET)) {
 326                 DEBUG(2, ("Discarding invalid packet type from %d: %d\n",
 327                           procid_to_pid(&src), p->packet_type));
 328                 return;
 329         }
 330
 331         local_ip = iface_ip(p->ip);
 332
 333         if (local_ip == NULL) {
 334                 DEBUG(2, ("Could not find ip for packet from %d\n",
 335                           procid_to_pid(&src)));
 336                 return;
 337         }
 338
 339         subrec = FIRST_SUBNET;
 340
 341         p->fd = (p->packet_type == NMB_PACKET) ?
 342                 subrec->nmb_sock : subrec->dgram_sock;
 343
 344         for (subrec = FIRST_SUBNET; subrec != NULL;
 345              subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
 346                 if (ip_equal(*local_ip, subrec->myip)) {
 347                         p->fd = (p->packet_type == NMB_PACKET) ?
 348                                 subrec->nmb_sock : subrec->dgram_sock;
 349                         break;
 350                 }
 351         }
 352
 353         if (p->packet_type == DGRAM_PACKET) {
 354                 p->port = 138;
 355                 p->packet.dgram.header.source_ip.s_addr = local_ip->s_addr;
 356                 p->packet.dgram.header.source_port = 138;
 357         }
 358
 359         send_packet(p);
 360 }
 361
 362 /**************************************************************************** **
 363  The main select loop.
 364  **************************************************************************** */
 365
 366 static void process(void)
 367 {
 368         BOOL run_election;
 369
 370         while( True ) {
 371                 time_t t = time(NULL);
 372
 373                 /* Check for internal messages */
 374
 375                 message_dispatch();
 376
 377                 /*
 378                  * Check all broadcast subnets to see if
 379                  * we need to run an election on any of them.
 380                  * (nmbd_elections.c)
 381                  */
 382
 383                 run_election = check_elections();
 384
 385                 /*
 386                  * Read incoming UDP packets.
 387                  * (nmbd_packets.c)
 388                  */
 389
 390                 if(listen_for_packets(run_election))
 391                         return;
 392
 393                 /*
 394                  * Handle termination inband.
 395                  */
 396
 397                 if (got_sig_term) {
 398                         got_sig_term = 0;
 399                         terminate();
 400                 }
 401
 402                 /*
 403                  * Process all incoming packets
 404                  * read above. This calls the success and
 405                  * failure functions registered when response
 406                  * packets arrrive, and also deals with request
 407                  * packets from other sources.
 408                  * (nmbd_packets.c)
 409                  */
 410
 411                 run_packet_queue();
 412
 413                 /*
 414                  * Run any elections - initiate becoming
 415                  * a local master browser if we have won.
 416                  * (nmbd_elections.c)
 417                  */
 418
 419                 run_elections(t);
 420
 421                 /*
 422                  * Send out any broadcast announcements
 423                  * of our server names. This also announces
 424                  * the workgroup name if we are a local
 425                  * master browser.
 426                  * (nmbd_sendannounce.c)
 427                  */
 428
 429                 announce_my_server_names(t);
 430
 431                 /*
 432                  * Send out any LanMan broadcast announcements
 433                  * of our server names.
 434                  * (nmbd_sendannounce.c)
 435                  */
 436
 437                 announce_my_lm_server_names(t);
 438
 439                 /*
 440                  * If we are a local master browser, periodically
 441                  * announce ourselves to the domain master browser.
 442                  * This also deals with syncronising the domain master
 443                  * browser server lists with ourselves as a local
 444                  * master browser.
 445                  * (nmbd_sendannounce.c)
 446                  */
 447
 448                 announce_myself_to_domain_master_browser(t);
 449
 450                 /*
 451                  * Fullfill any remote announce requests.
 452                  * (nmbd_sendannounce.c)
 453                  */
 454
 455                 announce_remote(t);
 456
 457                 /*
 458                  * Fullfill any remote browse sync announce requests.
 459                  * (nmbd_sendannounce.c)
 460                  */
 461
 462                 browse_sync_remote(t);
 463
 464                 /*
 465                  * Scan the broadcast subnets, and WINS client
 466                  * namelists and refresh any that need refreshing.
 467                  * (nmbd_mynames.c)
 468                  */
 469
 470                 refresh_my_names(t);
 471
 472                 /*
 473                  * Scan the subnet namelists and server lists and
 474                  * expire thos that have timed out.
 475                  * (nmbd.c)
 476                  */
 477
 478                 expire_names_and_servers(t);
 479
 480                 /*
 481                  * Write out a snapshot of our current browse list into
 482                  * the browse.dat file. This is used by smbd to service
 483                  * incoming NetServerEnum calls - used to synchronise
 484                  * browse lists over subnets.
 485                  * (nmbd_serverlistdb.c)
 486                  */
 487
 488                 write_browse_list(t, False);
 489
 490                 /*
 491                  * If we are a domain master browser, we have a list of
 492                  * local master browsers we should synchronise browse
 493                  * lists with (these are added by an incoming local
 494                  * master browser announcement packet). Expire any of
 495                  * these that are no longer current, and pull the server
 496                  * lists from each of these known local master browsers.
 497                  * (nmbd_browsesync.c)
 498                  */
 499
 500                 dmb_expire_and_sync_browser_lists(t);
 501
 502                 /*
 503                  * Check that there is a local master browser for our
 504                  * workgroup for all our broadcast subnets. If one
 505                  * is not found, start an election (which we ourselves
 506                  * may or may not participate in, depending on the
 507                  * setting of the 'local master' parameter.
 508                  * (nmbd_elections.c)
 509                  */
 510
 511                 check_master_browser_exists(t);
 512
 513                 /*
 514                  * If we are configured as a logon server, attempt to
 515                  * register the special NetBIOS names to become such
 516                  * (WORKGROUP<1c> name) on all broadcast subnets and
 517                  * with the WINS server (if used). If we are configured
 518                  * to become a domain master browser, attempt to register
 519                  * the special NetBIOS name (WORKGROUP<1b> name) to
 520                  * become such.
 521                  * (nmbd_become_dmb.c)
 522                  */
 523
 524                 add_domain_names(t);
 525
 526                 /*
 527                  * If we are a WINS server, do any timer dependent
 528                  * processing required.
 529                  * (nmbd_winsserver.c)
 530                  */
 531
 532                 initiate_wins_processing(t);
 533
 534                 /*
 535                  * If we are a domain master browser, attempt to contact the
 536                  * WINS server to get a list of all known WORKGROUPS/DOMAINS.
 537                  * This will only work to a Samba WINS server.
 538                  * (nmbd_browsesync.c)
 539                  */
 540
 541                 if (lp_enhanced_browsing())
 542                         collect_all_workgroup_names_from_wins_server(t);
 543
 544                 /*
 545                  * Go through the response record queue and time out or re-transmit
 546                  * and expired entries.
 547                  * (nmbd_packets.c)
 548                  */
 549
 550                 retransmit_or_expire_response_records(t);
 551
 552                 /*
 553                  * check to see if any remote browse sync child processes have completed
 554                  */
 555
 556                 sync_check_completion();
 557
 558                 /*
 559                  * regularly sync with any other DMBs we know about
 560                  */
 561
 562                 if (lp_enhanced_browsing())
 563                         sync_all_dmbs(t);
 564
 565                 /*
 566                  * clear the unexpected packet queue
 567                  */
 568
 569                 clear_unexpected(t);
 570
 571                 /*
 572                  * Reload the services file if we got a sighup.
 573                  */
 574
 575                 if(reload_after_sighup) {
 576                         DEBUG( 0, ( "Got SIGHUP dumping debug info.\n" ) );
 577                         msg_reload_nmbd_services(MSG_SMB_CONF_UPDATED,
 578                                                  pid_to_procid(0), NULL, 0, NULL);
 579                         reload_after_sighup = 0;
 580                 }
 581
 582                 /* check for new network interfaces */
 583
 584                 reload_interfaces(t);
 585
 586                 /* free up temp memory */
 587                 lp_TALLOC_FREE();
 588         }
 589 }
 590
 591 /**************************************************************************** **
 592  Open the socket communication.
 593  **************************************************************************** */
 594
 595 static BOOL open_sockets(BOOL isdaemon, int port)
 596 {
 597         /*
 598          * The sockets opened here will be used to receive broadcast
 599          * packets *only*. Interface specific sockets are opened in
 600          * make_subnet() in namedbsubnet.c. Thus we bind to the
 601          * address "0.0.0.0". The parameter 'socket address' is
 602          * now deprecated.
 603          */
 604
 605         if ( isdaemon )
 606                 ClientNMB = open_socket_in(SOCK_DGRAM, port,
 607                                            0, interpret_addr(lp_socket_address()),
 608                                            True);
 609         else
 610                 ClientNMB = 0;
 611
 612         ClientDGRAM = open_socket_in(SOCK_DGRAM, DGRAM_PORT,
 613                                            3, interpret_addr(lp_socket_address()),
 614                                            True);
 615
 616         if ( ClientNMB == -1 )
 617                 return( False );
 618
 619         /* we are never interested in SIGPIPE */
 620         BlockSignals(True,SIGPIPE);
 621
 622         set_socket_options( ClientNMB,   "SO_BROADCAST" );
 623         set_socket_options( ClientDGRAM, "SO_BROADCAST" );
 624
 625         /* Ensure we're non-blocking. */
 626         set_blocking( ClientNMB, False);
 627         set_blocking( ClientDGRAM, False);
 628
 629         DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
 630         return( True );
 631 }
 632
 633 /**************************************************************************** **
 634  main program
 635  **************************************************************************** */
 636  int main(int argc, const char *argv[])
 637 {
 638         pstring logfile;
 639         static BOOL opt_interactive;
 640         poptContext pc;
 641         static char *p_lmhosts = dyn_LMHOSTSFILE;
 642         static BOOL no_process_group = False;
 643         struct poptOption long_options[] = {
 644         POPT_AUTOHELP
 645         {"daemon", 'D', POPT_ARG_VAL, &is_daemon, True, "Become a daemon(default)" },
 646         {"interactive", 'i', POPT_ARG_VAL, &opt_interactive, True, "Run interactive (not a daemon)" },
 647         {"foreground", 'F', POPT_ARG_VAL, &Fork, False, "Run daemon in foreground (for daemontools & etc)" },
 648         {"no-process-group", 0, POPT_ARG_VAL, &no_process_group, True, "Don't create a new process group" },
 649         {"log-stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
 650         {"hosts", 'H', POPT_ARG_STRING, &p_lmhosts, 'H', "Load a netbios hosts file"},
 651         {"port", 'p', POPT_ARG_INT, &global_nmb_port, NMB_PORT, "Listen on the specified port" },
 652         POPT_COMMON_SAMBA
 653         { NULL }
 654         };
 655
 656         load_case_tables();
 657
 658         global_nmb_port = NMB_PORT;
 659
 660         pc = poptGetContext("nmbd", argc, argv, long_options, 0);
 661         while (poptGetNextOpt(pc) != -1) {};
 662         poptFreeContext(pc);
 663
 664         global_in_nmbd = True;
 665
 666         StartupTime = time(NULL);
 667
 668         sys_srandom(time(NULL) ^ sys_getpid());
 669
 670         if (!override_logfile) {
 671                 slprintf(logfile, sizeof(logfile)-1, "%s/log.nmbd", dyn_LOGFILEBASE);
 672                 lp_set_logfile(logfile);
 673         }
 674
 675         fault_setup((void (*)(void *))fault_continue );
 676         dump_core_setup("nmbd");
 677
 678         /* POSIX demands that signals are inherited. If the invoking process has
 679          * these signals masked, we will have problems, as we won't receive them. */
 680         BlockSignals(False, SIGHUP);
 681         BlockSignals(False, SIGUSR1);
 682         BlockSignals(False, SIGTERM);
 683
 684         CatchSignal( SIGHUP,  SIGNAL_CAST sig_hup );
 685         CatchSignal( SIGTERM, SIGNAL_CAST sig_term );
 686
 687 #if defined(SIGFPE)
 688         /* we are never interested in SIGFPE */
 689         BlockSignals(True,SIGFPE);
 690 #endif
 691
 692         /* We no longer use USR2... */
 693 #if defined(SIGUSR2)
 694         BlockSignals(True, SIGUSR2);
 695 #endif
 696
 697         if ( opt_interactive ) {
 698                 Fork = False;
 699                 log_stdout = True;
 700         }
 701
 702         if ( log_stdout && Fork ) {
 703                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
 704                 exit(1);
 705         }
 706
 707         setup_logging( argv[0], log_stdout );
 708
 709         reopen_logs();
 710
 711         DEBUG( 0, ( "Netbios nameserver version %s started.\n", SAMBA_VERSION_STRING) );
 712         DEBUGADD( 0, ( "%s\n", COPYRIGHT_STARTUP_MESSAGE ) );
 713
 714         if ( !reload_nmbd_services(False) )
 715                 return(-1);
 716
 717         if(!init_names())
 718                 return -1;
 719
 720         reload_nmbd_services( True );
 721
 722         if (strequal(lp_workgroup(),"*")) {
 723                 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
 724                 exit(1);
 725         }
 726
 727         set_samba_nb_type();
 728
 729         if (!is_daemon && !is_a_socket(0)) {
 730                 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
 731                 is_daemon = True;
 732         }
 733
 734         if (is_daemon && !opt_interactive) {
 735                 DEBUG( 2, ( "Becoming a daemon.\n" ) );
 736                 become_daemon(Fork, no_process_group);
 737         }
 738
 739 #if HAVE_SETPGID
 740         /*
 741          * If we're interactive we want to set our own process group for
 742          * signal management.
 743          */
 744         if (opt_interactive && !no_process_group)
 745                 setpgid( (pid_t)0, (pid_t)0 );
 746 #endif
 747
 748 #ifndef SYNC_DNS
 749         /* Setup the async dns. We do it here so it doesn't have all the other
 750                 stuff initialised and thus chewing memory and sockets */
 751         if(lp_we_are_a_wins_server() && lp_dns_proxy()) {
 752                 start_async_dns();
 753         }
 754 #endif
 755
 756         if (!directory_exist(lp_lockdir(), NULL)) {
 757                 mkdir(lp_lockdir(), 0755);
 758         }
 759
 760         pidfile_create("nmbd");
 761         message_init();
 762         message_register(MSG_FORCE_ELECTION, nmbd_message_election, NULL);
 763 #if 0
 764         /* Until winsrepl is done. */
 765         message_register(MSG_WINS_NEW_ENTRY, nmbd_wins_new_entry, NULL);
 766 #endif
 767         message_register(MSG_SHUTDOWN, nmbd_terminate, NULL);
 768         message_register(MSG_SMB_CONF_UPDATED, msg_reload_nmbd_services, NULL);
 769         message_register(MSG_SEND_PACKET, msg_nmbd_send_packet, NULL);
 770
 771         TimeInit();
 772
 773         DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port ) );
 774
 775         if ( !open_sockets( is_daemon, global_nmb_port ) ) {
 776                 kill_async_dns_child();
 777                 return 1;
 778         }
 779
 780         /* Determine all the IP addresses we have. */
 781         load_interfaces();
 782
 783         /* Create an nmbd subnet record for each of the above. */
 784         if( False == create_subnets() ) {
 785                 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
 786                 kill_async_dns_child();
 787                 exit(1);
 788         }
 789
 790         /* Load in any static local names. */
 791         load_lmhosts_file(p_lmhosts);
 792         DEBUG(3,("Loaded hosts file %s\n", p_lmhosts));
 793
 794         /* If we are acting as a WINS server, initialise data structures. */
 795         if( !initialise_wins() ) {
 796                 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
 797                 kill_async_dns_child();
 798                 exit(1);
 799         }
 800
 801         /*
 802          * Register nmbd primary workgroup and nmbd names on all
 803          * the broadcast subnets, and on the WINS server (if specified).
 804          * Also initiate the startup of our primary workgroup (start
 805          * elections if we are setup as being able to be a local
 806          * master browser.
 807          */
 808
 809         if( False == register_my_workgroup_and_names() ) {
 810                 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
 811                 kill_async_dns_child();
 812                 exit(1);
 813         }
 814
 815         /* We can only take signals in the select. */
 816         BlockSignals( True, SIGTERM );
 817
 818         process();
 819
 820         if (dbf)
 821                 x_fclose(dbf);
 822         kill_async_dns_child();
 823         return(0);
 824 }