release/src/router/samba3/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)
  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                 if (!iface) {
 177                         DEBUG(2,("reload_interfaces: failed to get interface %d\n", n));
 178                         continue;
 179                 }
 180
 181                 /*
 182                  * We don't want to add a loopback interface, in case
 183                  * someone has added 127.0.0.1 for smbd, nmbd needs to
 184                  * ignore it here. JRA.
 185                  */
 186
 187                 if (ip_equal(iface->ip, loopback_ip)) {
 188                         DEBUG(2,("reload_interfaces: Ignoring loopback interface %s\n", inet_ntoa(iface->ip)));
 189                         continue;
 190                 }
 191
 192                 for (subrec=subnetlist; subrec; subrec=subrec->next) {
 193                         if (ip_equal(iface->ip, subrec->myip) &&
 194                             ip_equal(iface->nmask, subrec->mask_ip)) break;
 195                 }
 196
 197                 if (!subrec) {
 198                         /* it wasn't found! add it */
 199                         DEBUG(2,("Found new interface %s\n",
 200                                  inet_ntoa(iface->ip)));
 201                         subrec = make_normal_subnet(iface);
 202                         if (subrec)
 203                                 register_my_workgroup_one_subnet(subrec);
 204                 }
 205         }
 206
 207         /* find any interfaces that need deleting */
 208         for (subrec=subnetlist; subrec; subrec=subrec->next) {
 209                 for (n=iface_count() - 1; n >= 0; n--) {
 210                         struct interface *iface = get_interface(n);
 211                         if (ip_equal(iface->ip, subrec->myip) &&
 212                             ip_equal(iface->nmask, subrec->mask_ip)) break;
 213                 }
 214                 if (n == -1) {
 215                         /* oops, an interface has disapeared. This is
 216                          tricky, we don't dare actually free the
 217                          interface as it could be being used, so
 218                          instead we just wear the memory leak and
 219                          remove it from the list of interfaces without
 220                          freeing it */
 221                         DEBUG(2,("Deleting dead interface %s\n",
 222                                  inet_ntoa(subrec->myip)));
 223                         close_subnet(subrec);
 224                 }
 225         }
 226
 227         rescan_listen_set = True;
 228
 229         /* We need to shutdown if there are no subnets... */
 230         if (FIRST_SUBNET == NULL) {
 231                 DEBUG(0,("reload_interfaces: No subnets to listen to. Shutting down...\n"));
 232                 return True;
 233         }
 234         return False;
 235 }
 236
 237 /**************************************************************************** **
 238  Reload the services file.
 239  **************************************************************************** */
 240
 241 static BOOL reload_nmbd_services(BOOL test)
 242 {
 243         BOOL ret;
 244
 245         set_remote_machine_name("nmbd", False);
 246
 247         if ( lp_loaded() ) {
 248                 pstring fname;
 249                 pstrcpy( fname,lp_configfile());
 250                 if (file_exist(fname,NULL) && !strcsequal(fname,dyn_CONFIGFILE)) {
 251                         pstrcpy(dyn_CONFIGFILE,fname);
 252                         test = False;
 253                 }
 254         }
 255
 256         if ( test && !lp_file_list_changed() )
 257                 return(True);
 258
 259         ret = lp_load( dyn_CONFIGFILE, True , False, False, True);
 260
 261         /* perhaps the config filename is now set */
 262         if ( !test ) {
 263                 DEBUG( 3, ( "services not loaded\n" ) );
 264                 reload_nmbd_services( True );
 265         }
 266
 267         return(ret);
 268 }
 269
 270 /**************************************************************************** **
 271  * React on 'smbcontrol nmbd reload-config' in the same way as to SIGHUP
 272  * We use buf here to return BOOL result to process() when reload_interfaces()
 273  * detects that there are no subnets.
 274  **************************************************************************** */
 275
 276 static void msg_reload_nmbd_services(int msg_type, struct process_id src,
 277                                      void *buf, size_t len)
 278 {
 279         write_browse_list( 0, True );
 280         dump_all_namelists();
 281         reload_nmbd_services( True );
 282         reopen_logs();
 283
 284         if(buf) {
 285                 /* We were called from process() */
 286                 /* If reload_interfaces() returned True */
 287                 /* we need to shutdown if there are no subnets... */
 288                 /* pass this info back to process() */
 289                 *((BOOL*)buf) = reload_interfaces(0);
 290         }
 291 }
 292
 293 static void msg_nmbd_send_packet(int msg_type, struct process_id src,
 294                                  void *buf, size_t len)
 295 {
 296         struct packet_struct *p = (struct packet_struct *)buf;
 297         struct subnet_record *subrec;
 298         struct in_addr *local_ip;
 299
 300         DEBUG(10, ("Received send_packet from %d\n", procid_to_pid(&src)));
 301
 302         if (len != sizeof(struct packet_struct)) {
 303                 DEBUG(2, ("Discarding invalid packet length from %d\n",
 304                           procid_to_pid(&src)));
 305                 return;
 306         }
 307
 308         if ((p->packet_type != NMB_PACKET) &&
 309             (p->packet_type != DGRAM_PACKET)) {
 310                 DEBUG(2, ("Discarding invalid packet type from %d: %d\n",
 311                           procid_to_pid(&src), p->packet_type));
 312                 return;
 313         }
 314
 315         local_ip = iface_ip(p->ip);
 316
 317         if (local_ip == NULL) {
 318                 DEBUG(2, ("Could not find ip for packet from %d\n",
 319                           procid_to_pid(&src)));
 320                 return;
 321         }
 322
 323         subrec = FIRST_SUBNET;
 324
 325         p->fd = (p->packet_type == NMB_PACKET) ?
 326                 subrec->nmb_sock : subrec->dgram_sock;
 327
 328         for (subrec = FIRST_SUBNET; subrec != NULL;
 329              subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
 330                 if (ip_equal(*local_ip, subrec->myip)) {
 331                         p->fd = (p->packet_type == NMB_PACKET) ?
 332                                 subrec->nmb_sock : subrec->dgram_sock;
 333                         break;
 334                 }
 335         }
 336
 337         if (p->packet_type == DGRAM_PACKET) {
 338                 p->port = 138;
 339                 p->packet.dgram.header.source_ip.s_addr = local_ip->s_addr;
 340                 p->packet.dgram.header.source_port = 138;
 341         }
 342
 343         send_packet(p);
 344 }
 345
 346 /**************************************************************************** **
 347  The main select loop.
 348  **************************************************************************** */
 349
 350 static void process(void)
 351 {
 352         BOOL run_election;
 353         BOOL no_subnets;
 354
 355         while( True ) {
 356                 time_t t = time(NULL);
 357
 358                 /* Check for internal messages */
 359
 360                 message_dispatch();
 361
 362                 /*
 363                  * Check all broadcast subnets to see if
 364                  * we need to run an election on any of them.
 365                  * (nmbd_elections.c)
 366                  */
 367
 368                 run_election = check_elections();
 369
 370                 /*
 371                  * Read incoming UDP packets.
 372                  * (nmbd_packets.c)
 373                  */
 374
 375                 if(listen_for_packets(run_election))
 376                         return;
 377
 378                 /*
 379                  * Handle termination inband.
 380                  */
 381
 382                 if (got_sig_term) {
 383                         got_sig_term = 0;
 384                         terminate();
 385                 }
 386
 387                 /*
 388                  * Process all incoming packets
 389                  * read above. This calls the success and
 390                  * failure functions registered when response
 391                  * packets arrrive, and also deals with request
 392                  * packets from other sources.
 393                  * (nmbd_packets.c)
 394                  */
 395
 396                 run_packet_queue();
 397
 398                 /*
 399                  * Run any elections - initiate becoming
 400                  * a local master browser if we have won.
 401                  * (nmbd_elections.c)
 402                  */
 403
 404                 run_elections(t);
 405
 406                 /*
 407                  * Send out any broadcast announcements
 408                  * of our server names. This also announces
 409                  * the workgroup name if we are a local
 410                  * master browser.
 411                  * (nmbd_sendannounce.c)
 412                  */
 413
 414                 announce_my_server_names(t);
 415
 416                 /*
 417                  * Send out any LanMan broadcast announcements
 418                  * of our server names.
 419                  * (nmbd_sendannounce.c)
 420                  */
 421
 422                 announce_my_lm_server_names(t);
 423
 424                 /*
 425                  * If we are a local master browser, periodically
 426                  * announce ourselves to the domain master browser.
 427                  * This also deals with syncronising the domain master
 428                  * browser server lists with ourselves as a local
 429                  * master browser.
 430                  * (nmbd_sendannounce.c)
 431                  */
 432
 433                 announce_myself_to_domain_master_browser(t);
 434
 435                 /*
 436                  * Fullfill any remote announce requests.
 437                  * (nmbd_sendannounce.c)
 438                  */
 439
 440                 announce_remote(t);
 441
 442                 /*
 443                  * Fullfill any remote browse sync announce requests.
 444                  * (nmbd_sendannounce.c)
 445                  */
 446
 447                 browse_sync_remote(t);
 448
 449                 /*
 450                  * Scan the broadcast subnets, and WINS client
 451                  * namelists and refresh any that need refreshing.
 452                  * (nmbd_mynames.c)
 453                  */
 454
 455                 refresh_my_names(t);
 456
 457                 /*
 458                  * Scan the subnet namelists and server lists and
 459                  * expire thos that have timed out.
 460                  * (nmbd.c)
 461                  */
 462
 463                 expire_names_and_servers(t);
 464
 465                 /*
 466                  * Write out a snapshot of our current browse list into
 467                  * the browse.dat file. This is used by smbd to service
 468                  * incoming NetServerEnum calls - used to synchronise
 469                  * browse lists over subnets.
 470                  * (nmbd_serverlistdb.c)
 471                  */
 472
 473                 write_browse_list(t, False);
 474
 475                 /*
 476                  * If we are a domain master browser, we have a list of
 477                  * local master browsers we should synchronise browse
 478                  * lists with (these are added by an incoming local
 479                  * master browser announcement packet). Expire any of
 480                  * these that are no longer current, and pull the server
 481                  * lists from each of these known local master browsers.
 482                  * (nmbd_browsesync.c)
 483                  */
 484
 485                 dmb_expire_and_sync_browser_lists(t);
 486
 487                 /*
 488                  * Check that there is a local master browser for our
 489                  * workgroup for all our broadcast subnets. If one
 490                  * is not found, start an election (which we ourselves
 491                  * may or may not participate in, depending on the
 492                  * setting of the 'local master' parameter.
 493                  * (nmbd_elections.c)
 494                  */
 495
 496                 check_master_browser_exists(t);
 497
 498                 /*
 499                  * If we are configured as a logon server, attempt to
 500                  * register the special NetBIOS names to become such
 501                  * (WORKGROUP<1c> name) on all broadcast subnets and
 502                  * with the WINS server (if used). If we are configured
 503                  * to become a domain master browser, attempt to register
 504                  * the special NetBIOS name (WORKGROUP<1b> name) to
 505                  * become such.
 506                  * (nmbd_become_dmb.c)
 507                  */
 508
 509                 add_domain_names(t);
 510
 511                 /*
 512                  * If we are a WINS server, do any timer dependent
 513                  * processing required.
 514                  * (nmbd_winsserver.c)
 515                  */
 516
 517                 initiate_wins_processing(t);
 518
 519                 /*
 520                  * If we are a domain master browser, attempt to contact the
 521                  * WINS server to get a list of all known WORKGROUPS/DOMAINS.
 522                  * This will only work to a Samba WINS server.
 523                  * (nmbd_browsesync.c)
 524                  */
 525
 526                 if (lp_enhanced_browsing())
 527                         collect_all_workgroup_names_from_wins_server(t);
 528
 529                 /*
 530                  * Go through the response record queue and time out or re-transmit
 531                  * and expired entries.
 532                  * (nmbd_packets.c)
 533                  */
 534
 535                 retransmit_or_expire_response_records(t);
 536
 537                 /*
 538                  * check to see if any remote browse sync child processes have completed
 539                  */
 540
 541                 sync_check_completion();
 542
 543                 /*
 544                  * regularly sync with any other DMBs we know about
 545                  */
 546
 547                 if (lp_enhanced_browsing())
 548                         sync_all_dmbs(t);
 549
 550                 /*
 551                  * clear the unexpected packet queue
 552                  */
 553
 554                 clear_unexpected(t);
 555
 556                 /*
 557                  * Reload the services file if we got a sighup.
 558                  */
 559
 560                 if(reload_after_sighup) {
 561                         DEBUG( 0, ( "Got SIGHUP dumping debug info.\n" ) );
 562                         msg_reload_nmbd_services(MSG_SMB_CONF_UPDATED,
 563                                                  pid_to_procid(0), (void*) &no_subnets, 0);
 564                         if(no_subnets)
 565                                 return;
 566                         reload_after_sighup = 0;
 567                 }
 568
 569                 /* check for new network interfaces */
 570
 571                 if(reload_interfaces(t))
 572                         return;
 573
 574                 /* free up temp memory */
 575                         lp_TALLOC_FREE();
 576         }
 577 }
 578
 579 /**************************************************************************** **
 580  Open the socket communication.
 581  **************************************************************************** */
 582
 583 static BOOL open_sockets(BOOL isdaemon, int port)
 584 {
 585         /*
 586          * The sockets opened here will be used to receive broadcast
 587          * packets *only*. Interface specific sockets are opened in
 588          * make_subnet() in namedbsubnet.c. Thus we bind to the
 589          * address "0.0.0.0". The parameter 'socket address' is
 590          * now deprecated.
 591          */
 592
 593         if ( isdaemon )
 594                 ClientNMB = open_socket_in(SOCK_DGRAM, port,
 595                                            0, interpret_addr(lp_socket_address()),
 596                                            True);
 597         else
 598                 ClientNMB = 0;
 599
 600         ClientDGRAM = open_socket_in(SOCK_DGRAM, DGRAM_PORT,
 601                                            3, interpret_addr(lp_socket_address()),
 602                                            True);
 603
 604         if ( ClientNMB == -1 )
 605                 return( False );
 606
 607         /* we are never interested in SIGPIPE */
 608         BlockSignals(True,SIGPIPE);
 609
 610         set_socket_options( ClientNMB,   "SO_BROADCAST" );
 611         set_socket_options( ClientDGRAM, "SO_BROADCAST" );
 612
 613         /* Ensure we're non-blocking. */
 614         set_blocking( ClientNMB, False);
 615         set_blocking( ClientDGRAM, False);
 616
 617         DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
 618         return( True );
 619 }
 620
 621 /**************************************************************************** **
 622  main program
 623  **************************************************************************** */
 624  int main(int argc, const char *argv[])
 625 {
 626         pstring logfile;
 627         static BOOL opt_interactive;
 628         poptContext pc;
 629         static char *p_lmhosts = dyn_LMHOSTSFILE;
 630         static BOOL no_process_group = False;
 631         struct poptOption long_options[] = {
 632         POPT_AUTOHELP
 633         {"daemon", 'D', POPT_ARG_VAL, &is_daemon, True, "Become a daemon(default)" },
 634         {"interactive", 'i', POPT_ARG_VAL, &opt_interactive, True, "Run interactive (not a daemon)" },
 635         {"foreground", 'F', POPT_ARG_VAL, &Fork, False, "Run daemon in foreground (for daemontools & etc)" },
 636         {"no-process-group", 0, POPT_ARG_VAL, &no_process_group, True, "Don't create a new process group" },
 637         {"log-stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
 638         {"hosts", 'H', POPT_ARG_STRING, &p_lmhosts, 'H', "Load a netbios hosts file"},
 639         {"port", 'p', POPT_ARG_INT, &global_nmb_port, NMB_PORT, "Listen on the specified port" },
 640         POPT_COMMON_SAMBA
 641         { NULL }
 642         };
 643
 644         load_case_tables();
 645
 646         global_nmb_port = NMB_PORT;
 647
 648         pc = poptGetContext("nmbd", argc, argv, long_options, 0);
 649         while (poptGetNextOpt(pc) != -1) {};
 650         poptFreeContext(pc);
 651
 652         global_in_nmbd = True;
 653
 654         StartupTime = time(NULL);
 655
 656         sys_srandom(time(NULL) ^ sys_getpid());
 657
 658         if (!override_logfile) {
 659                 slprintf(logfile, sizeof(logfile)-1, "%s/log.nmbd", dyn_LOGFILEBASE);
 660                 lp_set_logfile(logfile);
 661         }
 662
 663         fault_setup((void (*)(void *))fault_continue );
 664         dump_core_setup("nmbd");
 665
 666         /* POSIX demands that signals are inherited. If the invoking process has
 667          * these signals masked, we will have problems, as we won't receive them. */
 668         BlockSignals(False, SIGHUP);
 669         BlockSignals(False, SIGUSR1);
 670         BlockSignals(False, SIGTERM);
 671
 672         CatchSignal( SIGHUP,  SIGNAL_CAST sig_hup );
 673         CatchSignal( SIGTERM, SIGNAL_CAST sig_term );
 674
 675 #if defined(SIGFPE)
 676         /* we are never interested in SIGFPE */
 677         BlockSignals(True,SIGFPE);
 678 #endif
 679
 680         /* We no longer use USR2... */
 681 #if defined(SIGUSR2)
 682         BlockSignals(True, SIGUSR2);
 683 #endif
 684
 685         if ( opt_interactive ) {
 686                 Fork = False;
 687                 log_stdout = True;
 688         }
 689
 690         if ( log_stdout && Fork ) {
 691                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
 692                 exit(1);
 693         }
 694
 695         setup_logging( argv[0], log_stdout );
 696
 697         reopen_logs();
 698
 699         DEBUG( 0, ( "Netbios nameserver version %s started.\n", SAMBA_VERSION_STRING) );
 700         DEBUGADD( 0, ( "%s\n", COPYRIGHT_STARTUP_MESSAGE ) );
 701
 702         if ( !reload_nmbd_services(False) )
 703                 return(-1);
 704
 705         if(!init_names())
 706                 return -1;
 707
 708         reload_nmbd_services( True );
 709
 710         if (strequal(lp_workgroup(),"*")) {
 711                 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
 712                 exit(1);
 713         }
 714
 715         set_samba_nb_type();
 716
 717         if (!is_daemon && !is_a_socket(0)) {
 718                 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
 719                 is_daemon = True;
 720         }
 721
 722         if (is_daemon && !opt_interactive) {
 723                 DEBUG( 2, ( "Becoming a daemon.\n" ) );
 724                 become_daemon(Fork, no_process_group);
 725         }
 726
 727 #if HAVE_SETPGID
 728         /*
 729          * If we're interactive we want to set our own process group for
 730          * signal management.
 731          */
 732         if (opt_interactive && !no_process_group)
 733                 setpgid( (pid_t)0, (pid_t)0 );
 734 #endif
 735
 736 #ifndef SYNC_DNS
 737         /* Setup the async dns. We do it here so it doesn't have all the other
 738                 stuff initialised and thus chewing memory and sockets */
 739         if(lp_we_are_a_wins_server() && lp_dns_proxy()) {
 740                 start_async_dns();
 741         }
 742 #endif
 743
 744         if (!directory_exist(lp_lockdir(), NULL)) {
 745                 mkdir(lp_lockdir(), 0755);
 746         }
 747
 748         pidfile_create("nmbd");
 749         message_init();
 750         message_register(MSG_FORCE_ELECTION, nmbd_message_election);
 751 #if 0
 752         /* Until winsrepl is done. */
 753         message_register(MSG_WINS_NEW_ENTRY, nmbd_wins_new_entry);
 754 #endif
 755         message_register(MSG_SHUTDOWN, nmbd_terminate);
 756         message_register(MSG_SMB_CONF_UPDATED, msg_reload_nmbd_services);
 757         message_register(MSG_SEND_PACKET, msg_nmbd_send_packet);
 758
 759         TimeInit();
 760
 761         DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port ) );
 762
 763         if ( !open_sockets( is_daemon, global_nmb_port ) ) {
 764                 kill_async_dns_child();
 765                 return 1;
 766         }
 767
 768         /* Determine all the IP addresses we have. */
 769         load_interfaces();
 770
 771         /* Create an nmbd subnet record for each of the above. */
 772         if( False == create_subnets() ) {
 773                 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
 774                 kill_async_dns_child();
 775                 exit(1);
 776         }
 777
 778         /* Load in any static local names. */
 779         load_lmhosts_file(p_lmhosts);
 780         DEBUG(3,("Loaded hosts file %s\n", p_lmhosts));
 781
 782         /* If we are acting as a WINS server, initialise data structures. */
 783         if( !initialise_wins() ) {
 784                 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
 785                 kill_async_dns_child();
 786                 exit(1);
 787         }
 788
 789         /*
 790          * Register nmbd primary workgroup and nmbd names on all
 791          * the broadcast subnets, and on the WINS server (if specified).
 792          * Also initiate the startup of our primary workgroup (start
 793          * elections if we are setup as being able to be a local
 794          * master browser.
 795          */
 796
 797         if( False == register_my_workgroup_and_names() ) {
 798                 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
 799                 kill_async_dns_child();
 800                 exit(1);
 801         }
 802
 803         /* We can only take signals in the select. */
 804         BlockSignals( True, SIGTERM );
 805
 806         process();
 807
 808         if (dbf)
 809                 x_fclose(dbf);
 810         kill_async_dns_child();
 811         return(0);
 812 }