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(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, pid_t src, void *buf, size_t len)
  80 {
  81         terminate();
  82 }
  83
  84 /**************************************************************************** **
  85  Catch a SIGTERM signal.
  86  **************************************************************************** */
  87
  88 static SIG_ATOMIC_T got_sig_term;
  89
  90 static void sig_term(int sig)
  91 {
  92         got_sig_term = 1;
  93         sys_select_signal(SIGTERM);
  94 }
  95
  96 /**************************************************************************** **
  97  Catch a SIGHUP signal.
  98  **************************************************************************** */
  99
 100 static SIG_ATOMIC_T reload_after_sighup;
 101
 102 static void sig_hup(int sig)
 103 {
 104         reload_after_sighup = 1;
 105         sys_select_signal(SIGHUP);
 106 }
 107
 108 #if DUMP_CORE
 109 /**************************************************************************** **
 110  Prepare to dump a core file - carefully!
 111  **************************************************************************** */
 112
 113 static BOOL dump_core(void)
 114 {
 115         char *p;
 116         pstring dname;
 117         pstrcpy( dname, lp_logfile() );
 118         if ((p=strrchr_m(dname,'/')))
 119                 *p=0;
 120         pstrcat( dname, "/corefiles" );
 121         mkdir( dname, 0700 );
 122         sys_chown( dname, getuid(), getgid() );
 123         chmod( dname, 0700 );
 124         if ( chdir(dname) )
 125                 return( False );
 126         umask( ~(0700) );
 127
 128 #ifdef HAVE_GETRLIMIT
 129 #ifdef RLIMIT_CORE
 130         {
 131                 struct rlimit rlp;
 132                 getrlimit( RLIMIT_CORE, &rlp );
 133                 rlp.rlim_cur = MAX( 4*1024*1024, rlp.rlim_cur );
 134                 setrlimit( RLIMIT_CORE, &rlp );
 135                 getrlimit( RLIMIT_CORE, &rlp );
 136                 DEBUG( 3, ( "Core limits now %d %d\n", (int)rlp.rlim_cur, (int)rlp.rlim_max ) );
 137         }
 138 #endif
 139 #endif
 140
 141
 142         DEBUG(0,("Dumping core in %s\n",dname));
 143         abort();
 144         return( True );
 145 }
 146 #endif
 147
 148 /**************************************************************************** **
 149  Possibly continue after a fault.
 150  **************************************************************************** */
 151
 152 static void fault_continue(void)
 153 {
 154 #if DUMP_CORE
 155         dump_core();
 156 #endif
 157 }
 158
 159 /**************************************************************************** **
 160  Expire old names from the namelist and server list.
 161  **************************************************************************** */
 162
 163 static void expire_names_and_servers(time_t t)
 164 {
 165         static time_t lastrun = 0;
 166
 167         if ( !lastrun )
 168                 lastrun = t;
 169         if ( t < (lastrun + 5) )
 170                 return;
 171         lastrun = t;
 172
 173         /*
 174          * Expire any timed out names on all the broadcast
 175          * subnets and those registered with the WINS server.
 176          * (nmbd_namelistdb.c)
 177          */
 178
 179         expire_names(t);
 180
 181         /*
 182          * Go through all the broadcast subnets and for each
 183          * workgroup known on that subnet remove any expired
 184          * server names. If a workgroup has an empty serverlist
 185          * and has itself timed out then remove the workgroup.
 186          * (nmbd_workgroupdb.c)
 187          */
 188
 189         expire_workgroups_and_servers(t);
 190 }
 191
 192 /************************************************************************** **
 193  Reload the list of network interfaces.
 194  ************************************************************************** */
 195
 196 static BOOL reload_interfaces(time_t t)
 197 {
 198         static time_t lastt;
 199         int n;
 200         struct subnet_record *subrec;
 201
 202         if (t && ((t - lastt) < NMBD_INTERFACES_RELOAD)) return False;
 203         lastt = t;
 204
 205         if (!interfaces_changed()) return False;
 206
 207         /* the list of probed interfaces has changed, we may need to add/remove
 208            some subnets */
 209         load_interfaces();
 210
 211         /* find any interfaces that need adding */
 212         for (n=iface_count() - 1; n >= 0; n--) {
 213                 struct interface *iface = get_interface(n);
 214
 215                 /*
 216                  * We don't want to add a loopback interface, in case
 217                  * someone has added 127.0.0.1 for smbd, nmbd needs to
 218                  * ignore it here. JRA.
 219                  */
 220
 221                 if (ip_equal(iface->ip, loopback_ip)) {
 222                         DEBUG(2,("reload_interfaces: Ignoring loopback interface %s\n", inet_ntoa(iface->ip)));
 223                         continue;
 224                 }
 225
 226                 for (subrec=subnetlist; subrec; subrec=subrec->next) {
 227                         if (ip_equal(iface->ip, subrec->myip) &&
 228                             ip_equal(iface->nmask, subrec->mask_ip)) break;
 229                 }
 230
 231                 if (!subrec) {
 232                         /* it wasn't found! add it */
 233                         DEBUG(2,("Found new interface %s\n",
 234                                  inet_ntoa(iface->ip)));
 235                         subrec = make_normal_subnet(iface);
 236                         if (subrec)
 237                                 register_my_workgroup_one_subnet(subrec);
 238                 }
 239         }
 240
 241         /* find any interfaces that need deleting */
 242         for (subrec=subnetlist; subrec; subrec=subrec->next) {
 243                 for (n=iface_count() - 1; n >= 0; n--) {
 244                         struct interface *iface = get_interface(n);
 245                         if (ip_equal(iface->ip, subrec->myip) &&
 246                             ip_equal(iface->nmask, subrec->mask_ip)) break;
 247                 }
 248                 if (n == -1) {
 249                         /* oops, an interface has disapeared. This is
 250                          tricky, we don't dare actually free the
 251                          interface as it could be being used, so
 252                          instead we just wear the memory leak and
 253                          remove it from the list of interfaces without
 254                          freeing it */
 255                         DEBUG(2,("Deleting dead interface %s\n",
 256                                  inet_ntoa(subrec->myip)));
 257                         close_subnet(subrec);
 258                 }
 259         }
 260
 261         rescan_listen_set = True;
 262
 263         /* We need to shutdown if there are no subnets... */
 264         if (FIRST_SUBNET == NULL) {
 265                 DEBUG(0,("reload_interfaces: No subnets to listen to. Shutting down...\n"));
 266                 return True;
 267         }
 268         return False;
 269 }
 270
 271 /**************************************************************************** **
 272  Reload the services file.
 273  **************************************************************************** */
 274
 275 static BOOL reload_nmbd_services(BOOL test)
 276 {
 277         BOOL ret;
 278
 279         set_remote_machine_name("nmbd", False);
 280
 281         if ( lp_loaded() ) {
 282                 pstring fname;
 283                 pstrcpy( fname,lp_configfile());
 284                 if (file_exist(fname,NULL) && !strcsequal(fname,dyn_CONFIGFILE)) {
 285                         pstrcpy(dyn_CONFIGFILE,fname);
 286                         test = False;
 287                 }
 288         }
 289
 290         if ( test && !lp_file_list_changed() )
 291                 return(True);
 292
 293         ret = lp_load( dyn_CONFIGFILE, True , False, False);
 294
 295         /* perhaps the config filename is now set */
 296         if ( !test ) {
 297                 DEBUG( 3, ( "services not loaded\n" ) );
 298                 reload_nmbd_services( True );
 299         }
 300
 301         return(ret);
 302 }
 303
 304 /**************************************************************************** **
 305  * React on 'smbcontrol nmbd reload-config' in the same way as to SIGHUP
 306  * We use buf here to return BOOL result to process() when reload_interfaces()
 307  * detects that there are no subnets.
 308  **************************************************************************** */
 309
 310 static void msg_reload_nmbd_services(int msg_type, pid_t src, void *buf, size_t len)
 311 {
 312         write_browse_list( 0, True );
 313         dump_all_namelists();
 314         reload_nmbd_services( True );
 315         reopen_logs();
 316
 317         if(buf) {
 318                 /* We were called from process() */
 319                 /* If reload_interfaces() returned True */
 320                 /* we need to shutdown if there are no subnets... */
 321                 /* pass this info back to process() */
 322                 *((BOOL*)buf) = reload_interfaces(0);
 323         }
 324 }
 325
 326 static void msg_nmbd_send_packet(int msg_type, pid_t src,
 327                                  void *buf, size_t len)
 328 {
 329         struct packet_struct *p = (struct packet_struct *)buf;
 330         struct subnet_record *subrec;
 331         struct in_addr *local_ip;
 332
 333         DEBUG(10, ("Received send_packet from %d\n", src));
 334
 335         if (len != sizeof(struct packet_struct)) {
 336                 DEBUG(2, ("Discarding invalid packet length from %d\n", src));
 337                 return;
 338         }
 339
 340         if ((p->packet_type != NMB_PACKET) &&
 341             (p->packet_type != DGRAM_PACKET)) {
 342                 DEBUG(2, ("Discarding invalid packet type from %d: %d\n",
 343                           src, p->packet_type));
 344                 return;
 345         }
 346
 347         local_ip = iface_ip(p->ip);
 348
 349         if (local_ip == NULL) {
 350                 DEBUG(2, ("Could not find ip for packet from %d\n", src));
 351                 return;
 352         }
 353
 354         subrec = FIRST_SUBNET;
 355
 356         p->fd = (p->packet_type == NMB_PACKET) ?
 357                 subrec->nmb_sock : subrec->dgram_sock;
 358
 359         for (subrec = FIRST_SUBNET; subrec != NULL;
 360              subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
 361                 if (ip_equal(*local_ip, subrec->myip)) {
 362                         p->fd = (p->packet_type == NMB_PACKET) ?
 363                                 subrec->nmb_sock : subrec->dgram_sock;
 364                         break;
 365                 }
 366         }
 367
 368         if (p->packet_type == DGRAM_PACKET) {
 369                 p->port = 138;
 370                 p->packet.dgram.header.source_ip.s_addr = local_ip->s_addr;
 371                 p->packet.dgram.header.source_port = 138;
 372         }
 373
 374         send_packet(p);
 375 }
 376
 377 /**************************************************************************** **
 378  The main select loop.
 379  **************************************************************************** */
 380
 381 static void process(void)
 382 {
 383         BOOL run_election;
 384         BOOL no_subnets;
 385
 386         while( True ) {
 387                 time_t t = time(NULL);
 388
 389                 /* Check for internal messages */
 390
 391                 message_dispatch();
 392
 393                 /*
 394                  * Check all broadcast subnets to see if
 395                  * we need to run an election on any of them.
 396                  * (nmbd_elections.c)
 397                  */
 398
 399                 run_election = check_elections();
 400
 401                 /*
 402                  * Read incoming UDP packets.
 403                  * (nmbd_packets.c)
 404                  */
 405
 406                 if(listen_for_packets(run_election))
 407                         return;
 408
 409                 /*
 410                  * Handle termination inband.
 411                  */
 412
 413                 if (got_sig_term) {
 414                         got_sig_term = 0;
 415                         terminate();
 416                 }
 417
 418                 /*
 419                  * Process all incoming packets
 420                  * read above. This calls the success and
 421                  * failure functions registered when response
 422                  * packets arrrive, and also deals with request
 423                  * packets from other sources.
 424                  * (nmbd_packets.c)
 425                  */
 426
 427                 run_packet_queue();
 428
 429                 /*
 430                  * Run any elections - initiate becoming
 431                  * a local master browser if we have won.
 432                  * (nmbd_elections.c)
 433                  */
 434
 435                 run_elections(t);
 436
 437                 /*
 438                  * Send out any broadcast announcements
 439                  * of our server names. This also announces
 440                  * the workgroup name if we are a local
 441                  * master browser.
 442                  * (nmbd_sendannounce.c)
 443                  */
 444
 445                 announce_my_server_names(t);
 446
 447                 /*
 448                  * Send out any LanMan broadcast announcements
 449                  * of our server names.
 450                  * (nmbd_sendannounce.c)
 451                  */
 452
 453                 announce_my_lm_server_names(t);
 454
 455                 /*
 456                  * If we are a local master browser, periodically
 457                  * announce ourselves to the domain master browser.
 458                  * This also deals with syncronising the domain master
 459                  * browser server lists with ourselves as a local
 460                  * master browser.
 461                  * (nmbd_sendannounce.c)
 462                  */
 463
 464                 announce_myself_to_domain_master_browser(t);
 465
 466                 /*
 467                  * Fullfill any remote announce requests.
 468                  * (nmbd_sendannounce.c)
 469                  */
 470
 471                 announce_remote(t);
 472
 473                 /*
 474                  * Fullfill any remote browse sync announce requests.
 475                  * (nmbd_sendannounce.c)
 476                  */
 477
 478                 browse_sync_remote(t);
 479
 480                 /*
 481                  * Scan the broadcast subnets, and WINS client
 482                  * namelists and refresh any that need refreshing.
 483                  * (nmbd_mynames.c)
 484                  */
 485
 486                 refresh_my_names(t);
 487
 488                 /*
 489                  * Scan the subnet namelists and server lists and
 490                  * expire thos that have timed out.
 491                  * (nmbd.c)
 492                  */
 493
 494                 expire_names_and_servers(t);
 495
 496                 /*
 497                  * Write out a snapshot of our current browse list into
 498                  * the browse.dat file. This is used by smbd to service
 499                  * incoming NetServerEnum calls - used to synchronise
 500                  * browse lists over subnets.
 501                  * (nmbd_serverlistdb.c)
 502                  */
 503
 504                 write_browse_list(t, False);
 505
 506                 /*
 507                  * If we are a domain master browser, we have a list of
 508                  * local master browsers we should synchronise browse
 509                  * lists with (these are added by an incoming local
 510                  * master browser announcement packet). Expire any of
 511                  * these that are no longer current, and pull the server
 512                  * lists from each of these known local master browsers.
 513                  * (nmbd_browsesync.c)
 514                  */
 515
 516                 dmb_expire_and_sync_browser_lists(t);
 517
 518                 /*
 519                  * Check that there is a local master browser for our
 520                  * workgroup for all our broadcast subnets. If one
 521                  * is not found, start an election (which we ourselves
 522                  * may or may not participate in, depending on the
 523                  * setting of the 'local master' parameter.
 524                  * (nmbd_elections.c)
 525                  */
 526
 527                 check_master_browser_exists(t);
 528
 529                 /*
 530                  * If we are configured as a logon server, attempt to
 531                  * register the special NetBIOS names to become such
 532                  * (WORKGROUP<1c> name) on all broadcast subnets and
 533                  * with the WINS server (if used). If we are configured
 534                  * to become a domain master browser, attempt to register
 535                  * the special NetBIOS name (WORKGROUP<1b> name) to
 536                  * become such.
 537                  * (nmbd_become_dmb.c)
 538                  */
 539
 540                 add_domain_names(t);
 541
 542                 /*
 543                  * If we are a WINS server, do any timer dependent
 544                  * processing required.
 545                  * (nmbd_winsserver.c)
 546                  */
 547
 548                 initiate_wins_processing(t);
 549
 550                 /*
 551                  * If we are a domain master browser, attempt to contact the
 552                  * WINS server to get a list of all known WORKGROUPS/DOMAINS.
 553                  * This will only work to a Samba WINS server.
 554                  * (nmbd_browsesync.c)
 555                  */
 556
 557                 if (lp_enhanced_browsing())
 558                         collect_all_workgroup_names_from_wins_server(t);
 559
 560                 /*
 561                  * Go through the response record queue and time out or re-transmit
 562                  * and expired entries.
 563                  * (nmbd_packets.c)
 564                  */
 565
 566                 retransmit_or_expire_response_records(t);
 567
 568                 /*
 569                  * check to see if any remote browse sync child processes have completed
 570                  */
 571
 572                 sync_check_completion();
 573
 574                 /*
 575                  * regularly sync with any other DMBs we know about
 576                  */
 577
 578                 if (lp_enhanced_browsing())
 579                         sync_all_dmbs(t);
 580
 581                 /*
 582                  * clear the unexpected packet queue
 583                  */
 584
 585                 clear_unexpected(t);
 586
 587                 /*
 588                  * Reload the services file if we got a sighup.
 589                  */
 590
 591                 if(reload_after_sighup) {
 592                         DEBUG( 0, ( "Got SIGHUP dumping debug info.\n" ) );
 593                         msg_reload_nmbd_services(MSG_SMB_CONF_UPDATED, (pid_t) 0, (void*) &no_subnets, 0);
 594                         if(no_subnets)
 595                                 return;
 596                         reload_after_sighup = 0;
 597                 }
 598
 599                 /* check for new network interfaces */
 600
 601                 if(reload_interfaces(t))
 602                         return;
 603
 604                 /* free up temp memory */
 605                         lp_talloc_free();
 606         }
 607 }
 608
 609 /**************************************************************************** **
 610  Open the socket communication.
 611  **************************************************************************** */
 612
 613 static BOOL open_sockets(BOOL isdaemon, int port)
 614 {
 615         /*
 616          * The sockets opened here will be used to receive broadcast
 617          * packets *only*. Interface specific sockets are opened in
 618          * make_subnet() in namedbsubnet.c. Thus we bind to the
 619          * address "0.0.0.0". The parameter 'socket address' is
 620          * now deprecated.
 621          */
 622
 623         if ( isdaemon )
 624                 ClientNMB = open_socket_in(SOCK_DGRAM, port,
 625                                            0, interpret_addr(lp_socket_address()),
 626                                            True);
 627         else
 628                 ClientNMB = 0;
 629
 630         ClientDGRAM = open_socket_in(SOCK_DGRAM,DGRAM_PORT,3,0,True);
 631
 632         if ( ClientNMB == -1 )
 633                 return( False );
 634
 635         /* we are never interested in SIGPIPE */
 636         BlockSignals(True,SIGPIPE);
 637
 638         set_socket_options( ClientNMB,   "SO_BROADCAST" );
 639         set_socket_options( ClientDGRAM, "SO_BROADCAST" );
 640
 641         DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
 642         return( True );
 643 }
 644
 645 /**************************************************************************** **
 646  main program
 647  **************************************************************************** */
 648  int main(int argc, const char *argv[])
 649 {
 650         pstring logfile;
 651         static BOOL opt_interactive;
 652         poptContext pc;
 653         struct poptOption long_options[] = {
 654         POPT_AUTOHELP
 655         {"daemon", 'D', POPT_ARG_VAL, &is_daemon, True, "Become a daemon(default)" },
 656         {"interactive", 'i', POPT_ARG_VAL, &opt_interactive, True, "Run interactive (not a daemon)" },
 657         {"foreground", 'F', POPT_ARG_VAL, &Fork, False, "Run daemon in foreground (for daemontools & etc)" },
 658         {"log-stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
 659         {"hosts", 'H', POPT_ARG_STRING, dyn_LMHOSTSFILE, 'H', "Load a netbios hosts file"},
 660         {"port", 'p', POPT_ARG_INT, &global_nmb_port, NMB_PORT, "Listen on the specified port" },
 661         POPT_COMMON_SAMBA
 662         { NULL }
 663         };
 664
 665         global_nmb_port = NMB_PORT;
 666
 667         pc = poptGetContext("nmbd", argc, argv, long_options, 0);
 668         while (poptGetNextOpt(pc) != -1) {};
 669         poptFreeContext(pc);
 670
 671         global_in_nmbd = True;
 672
 673         StartupTime = time(NULL);
 674
 675         sys_srandom(time(NULL) ^ sys_getpid());
 676
 677         if (!override_logfile) {
 678                 slprintf(logfile, sizeof(logfile)-1, "%s/log.nmbd", dyn_LOGFILEBASE);
 679                 lp_set_logfile(logfile);
 680         }
 681
 682         fault_setup((void (*)(void *))fault_continue );
 683
 684         /* POSIX demands that signals are inherited. If the invoking process has
 685          * these signals masked, we will have problems, as we won't receive them. */
 686         BlockSignals(False, SIGHUP);
 687         BlockSignals(False, SIGUSR1);
 688         BlockSignals(False, SIGTERM);
 689
 690         CatchSignal( SIGHUP,  SIGNAL_CAST sig_hup );
 691         CatchSignal( SIGTERM, SIGNAL_CAST sig_term );
 692
 693 #if defined(SIGFPE)
 694         /* we are never interested in SIGFPE */
 695         BlockSignals(True,SIGFPE);
 696 #endif
 697
 698         /* We no longer use USR2... */
 699 #if defined(SIGUSR2)
 700         BlockSignals(True, SIGUSR2);
 701 #endif
 702
 703         if ( opt_interactive ) {
 704                 Fork = False;
 705                 log_stdout = True;
 706         }
 707
 708         if ( log_stdout && Fork ) {
 709                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
 710                 exit(1);
 711         }
 712
 713         setup_logging( argv[0], log_stdout );
 714
 715         reopen_logs();
 716
 717         DEBUG( 0, ( "Netbios nameserver version %s started.\n", SAMBA_VERSION_STRING) );
 718         DEBUGADD( 0, ( "Copyright Andrew Tridgell and the Samba Team 1994-2004\n" ) );
 719
 720         if ( !reload_nmbd_services(False) )
 721                 return(-1);
 722
 723         if(!init_names())
 724                 return -1;
 725
 726         reload_nmbd_services( True );
 727
 728         if (strequal(lp_workgroup(),"*")) {
 729                 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
 730                 exit(1);
 731         }
 732
 733         set_samba_nb_type();
 734
 735         if (!is_daemon && !is_a_socket(0)) {
 736                 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
 737                 is_daemon = True;
 738         }
 739
 740         if (is_daemon && !opt_interactive) {
 741                 DEBUG( 2, ( "Becoming a daemon.\n" ) );
 742                 become_daemon(Fork);
 743         }
 744
 745 #if HAVE_SETPGID
 746         /*
 747          * If we're interactive we want to set our own process group for
 748          * signal management.
 749          */
 750         if (opt_interactive)
 751                 setpgid( (pid_t)0, (pid_t)0 );
 752 #endif
 753
 754 #ifndef SYNC_DNS
 755         /* Setup the async dns. We do it here so it doesn't have all the other
 756                 stuff initialised and thus chewing memory and sockets */
 757         if(lp_we_are_a_wins_server() && lp_dns_proxy()) {
 758                 start_async_dns();
 759         }
 760 #endif
 761
 762         if (!directory_exist(lp_lockdir(), NULL)) {
 763                 mkdir(lp_lockdir(), 0755);
 764         }
 765
 766         pidfile_create("nmbd");
 767         message_init();
 768         message_register(MSG_FORCE_ELECTION, nmbd_message_election);
 769         message_register(MSG_WINS_NEW_ENTRY, nmbd_wins_new_entry);
 770         message_register(MSG_SHUTDOWN, nmbd_terminate);
 771         message_register(MSG_SMB_CONF_UPDATED, msg_reload_nmbd_services);
 772         message_register(MSG_SEND_PACKET, msg_nmbd_send_packet);
 773
 774         DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port ) );
 775
 776         if ( !open_sockets( is_daemon, global_nmb_port ) ) {
 777                 kill_async_dns_child();
 778                 return 1;
 779         }
 780
 781         /* Determine all the IP addresses we have. */
 782         load_interfaces();
 783
 784         /* Create an nmbd subnet record for each of the above. */
 785         if( False == create_subnets() ) {
 786                 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
 787                 kill_async_dns_child();
 788                 exit(1);
 789         }
 790
 791         /* Load in any static local names. */
 792         load_lmhosts_file(dyn_LMHOSTSFILE);
 793         DEBUG(3,("Loaded hosts file %s\n", dyn_LMHOSTSFILE));
 794
 795         /* If we are acting as a WINS server, initialise data structures. */
 796         if( !initialise_wins() ) {
 797                 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
 798                 kill_async_dns_child();
 799                 exit(1);
 800         }
 801
 802         /*
 803          * Register nmbd primary workgroup and nmbd names on all
 804          * the broadcast subnets, and on the WINS server (if specified).
 805          * Also initiate the startup of our primary workgroup (start
 806          * elections if we are setup as being able to be a local
 807          * master browser.
 808          */
 809
 810         if( False == register_my_workgroup_and_names() ) {
 811                 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
 812                 kill_async_dns_child();
 813                 exit(1);
 814         }
 815
 816         /* We can only take signals in the select. */
 817         BlockSignals( True, SIGTERM );
 818
 819         process();
 820
 821         if (dbf)
 822                 x_fclose(dbf);
 823         kill_async_dns_child();
 824         return(0);
 825 }