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();
  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();
 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
 327 /**************************************************************************** **
 328  The main select loop.
 329  **************************************************************************** */
 330
 331 static void process(void)
 332 {
 333         BOOL run_election;
 334         BOOL no_subnets;
 335
 336         while( True ) {
 337                 time_t t = time(NULL);
 338
 339                 /* Check for internal messages */
 340
 341                 message_dispatch();
 342
 343                 /*
 344                  * Check all broadcast subnets to see if
 345                  * we need to run an election on any of them.
 346                  * (nmbd_elections.c)
 347                  */
 348
 349                 run_election = check_elections();
 350
 351                 /*
 352                  * Read incoming UDP packets.
 353                  * (nmbd_packets.c)
 354                  */
 355
 356                 if(listen_for_packets(run_election))
 357                         return;
 358
 359                 /*
 360                  * Handle termination inband.
 361                  */
 362
 363                 if (got_sig_term) {
 364                         got_sig_term = 0;
 365                         terminate();
 366                 }
 367
 368                 /*
 369                  * Process all incoming packets
 370                  * read above. This calls the success and
 371                  * failure functions registered when response
 372                  * packets arrrive, and also deals with request
 373                  * packets from other sources.
 374                  * (nmbd_packets.c)
 375                  */
 376
 377                 run_packet_queue();
 378
 379                 /*
 380                  * Run any elections - initiate becoming
 381                  * a local master browser if we have won.
 382                  * (nmbd_elections.c)
 383                  */
 384
 385                 run_elections(t);
 386
 387                 /*
 388                  * Send out any broadcast announcements
 389                  * of our server names. This also announces
 390                  * the workgroup name if we are a local
 391                  * master browser.
 392                  * (nmbd_sendannounce.c)
 393                  */
 394
 395                 announce_my_server_names(t);
 396
 397                 /*
 398                  * Send out any LanMan broadcast announcements
 399                  * of our server names.
 400                  * (nmbd_sendannounce.c)
 401                  */
 402
 403                 announce_my_lm_server_names(t);
 404
 405                 /*
 406                  * If we are a local master browser, periodically
 407                  * announce ourselves to the domain master browser.
 408                  * This also deals with syncronising the domain master
 409                  * browser server lists with ourselves as a local
 410                  * master browser.
 411                  * (nmbd_sendannounce.c)
 412                  */
 413
 414                 announce_myself_to_domain_master_browser(t);
 415
 416                 /*
 417                  * Fullfill any remote announce requests.
 418                  * (nmbd_sendannounce.c)
 419                  */
 420
 421                 announce_remote(t);
 422
 423                 /*
 424                  * Fullfill any remote browse sync announce requests.
 425                  * (nmbd_sendannounce.c)
 426                  */
 427
 428                 browse_sync_remote(t);
 429
 430                 /*
 431                  * Scan the broadcast subnets, and WINS client
 432                  * namelists and refresh any that need refreshing.
 433                  * (nmbd_mynames.c)
 434                  */
 435
 436                 refresh_my_names(t);
 437
 438                 /*
 439                  * Scan the subnet namelists and server lists and
 440                  * expire thos that have timed out.
 441                  * (nmbd.c)
 442                  */
 443
 444                 expire_names_and_servers(t);
 445
 446                 /*
 447                  * Write out a snapshot of our current browse list into
 448                  * the browse.dat file. This is used by smbd to service
 449                  * incoming NetServerEnum calls - used to synchronise
 450                  * browse lists over subnets.
 451                  * (nmbd_serverlistdb.c)
 452                  */
 453
 454                 write_browse_list(t, False);
 455
 456                 /*
 457                  * If we are a domain master browser, we have a list of
 458                  * local master browsers we should synchronise browse
 459                  * lists with (these are added by an incoming local
 460                  * master browser announcement packet). Expire any of
 461                  * these that are no longer current, and pull the server
 462                  * lists from each of these known local master browsers.
 463                  * (nmbd_browsesync.c)
 464                  */
 465
 466                 dmb_expire_and_sync_browser_lists(t);
 467
 468                 /*
 469                  * Check that there is a local master browser for our
 470                  * workgroup for all our broadcast subnets. If one
 471                  * is not found, start an election (which we ourselves
 472                  * may or may not participate in, depending on the
 473                  * setting of the 'local master' parameter.
 474                  * (nmbd_elections.c)
 475                  */
 476
 477                 check_master_browser_exists(t);
 478
 479                 /*
 480                  * If we are configured as a logon server, attempt to
 481                  * register the special NetBIOS names to become such
 482                  * (WORKGROUP<1c> name) on all broadcast subnets and
 483                  * with the WINS server (if used). If we are configured
 484                  * to become a domain master browser, attempt to register
 485                  * the special NetBIOS name (WORKGROUP<1b> name) to
 486                  * become such.
 487                  * (nmbd_become_dmb.c)
 488                  */
 489
 490                 add_domain_names(t);
 491
 492                 /*
 493                  * If we are a WINS server, do any timer dependent
 494                  * processing required.
 495                  * (nmbd_winsserver.c)
 496                  */
 497
 498                 initiate_wins_processing(t);
 499
 500                 /*
 501                  * If we are a domain master browser, attempt to contact the
 502                  * WINS server to get a list of all known WORKGROUPS/DOMAINS.
 503                  * This will only work to a Samba WINS server.
 504                  * (nmbd_browsesync.c)
 505                  */
 506
 507                 if (lp_enhanced_browsing())
 508                         collect_all_workgroup_names_from_wins_server(t);
 509
 510                 /*
 511                  * Go through the response record queue and time out or re-transmit
 512                  * and expired entries.
 513                  * (nmbd_packets.c)
 514                  */
 515
 516                 retransmit_or_expire_response_records(t);
 517
 518                 /*
 519                  * check to see if any remote browse sync child processes have completed
 520                  */
 521
 522                 sync_check_completion();
 523
 524                 /*
 525                  * regularly sync with any other DMBs we know about
 526                  */
 527
 528                 if (lp_enhanced_browsing())
 529                         sync_all_dmbs(t);
 530
 531                 /*
 532                  * clear the unexpected packet queue
 533                  */
 534
 535                 clear_unexpected(t);
 536
 537                 /*
 538                  * Reload the services file if we got a sighup.
 539                  */
 540
 541                 if(reload_after_sighup) {
 542                         DEBUG( 0, ( "Got SIGHUP dumping debug info.\n" ) );
 543                         msg_reload_nmbd_services(MSG_SMB_CONF_UPDATED, (pid_t) 0, (void*) &no_subnets, 0);
 544                         if(no_subnets)
 545                                 return;
 546                         reload_after_sighup = 0;
 547                 }
 548
 549                 /* check for new network interfaces */
 550
 551                 if(reload_interfaces(t))
 552                         return;
 553
 554                 /* free up temp memory */
 555                         lp_talloc_free();
 556         }
 557 }
 558
 559 /**************************************************************************** **
 560  Open the socket communication.
 561  **************************************************************************** */
 562
 563 static BOOL open_sockets(BOOL isdaemon, int port)
 564 {
 565         /*
 566          * The sockets opened here will be used to receive broadcast
 567          * packets *only*. Interface specific sockets are opened in
 568          * make_subnet() in namedbsubnet.c. Thus we bind to the
 569          * address "0.0.0.0". The parameter 'socket address' is
 570          * now deprecated.
 571          */
 572
 573         if ( isdaemon )
 574                 ClientNMB = open_socket_in(SOCK_DGRAM, port,
 575                                            0, interpret_addr(lp_socket_address()),
 576                                            True);
 577         else
 578                 ClientNMB = 0;
 579
 580         ClientDGRAM = open_socket_in(SOCK_DGRAM,DGRAM_PORT,3,0,True);
 581
 582         if ( ClientNMB == -1 )
 583                 return( False );
 584
 585         /* we are never interested in SIGPIPE */
 586         BlockSignals(True,SIGPIPE);
 587
 588         set_socket_options( ClientNMB,   "SO_BROADCAST" );
 589         set_socket_options( ClientDGRAM, "SO_BROADCAST" );
 590
 591         DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
 592         return( True );
 593 }
 594
 595 /**************************************************************************** **
 596  main program
 597  **************************************************************************** */
 598  int main(int argc, const char *argv[])
 599 {
 600         pstring logfile;
 601         static BOOL opt_interactive;
 602         poptContext pc;
 603         int opt;
 604         struct poptOption long_options[] = {
 605         POPT_AUTOHELP
 606         {"daemon", 'D', POPT_ARG_VAL, &is_daemon, True, "Become a daemon(default)" },
 607         {"interactive", 'i', POPT_ARG_VAL, &opt_interactive, True, "Run interactive (not a daemon)" },
 608         {"foreground", 'F', POPT_ARG_VAL, &Fork, False, "Run daemon in foreground (for daemontools & etc)" },
 609         {"log-stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
 610         {"hosts", 'H', POPT_ARG_STRING, dyn_LMHOSTSFILE, 'H', "Load a netbios hosts file"},
 611         {"port", 'p', POPT_ARG_INT, &global_nmb_port, NMB_PORT, "Listen on the specified port" },
 612         POPT_COMMON_SAMBA
 613         { NULL }
 614         };
 615
 616         global_nmb_port = NMB_PORT;
 617
 618         pc = poptGetContext("nmbd", argc, argv, long_options, 0);
 619         while ((opt = poptGetNextOpt(pc)) != -1) ;
 620         poptFreeContext(pc);
 621
 622         global_in_nmbd = True;
 623
 624         StartupTime = time(NULL);
 625
 626         sys_srandom(time(NULL) ^ sys_getpid());
 627
 628         if (!override_logfile) {
 629                 slprintf(logfile, sizeof(logfile)-1, "%s/log.nmbd", dyn_LOGFILEBASE);
 630                 lp_set_logfile(logfile);
 631         }
 632
 633         fault_setup((void (*)(void *))fault_continue );
 634
 635         /* POSIX demands that signals are inherited. If the invoking process has
 636          * these signals masked, we will have problems, as we won't receive them. */
 637         BlockSignals(False, SIGHUP);
 638         BlockSignals(False, SIGUSR1);
 639         BlockSignals(False, SIGTERM);
 640
 641         CatchSignal( SIGHUP,  SIGNAL_CAST sig_hup );
 642         CatchSignal( SIGTERM, SIGNAL_CAST sig_term );
 643
 644 #if defined(SIGFPE)
 645         /* we are never interested in SIGFPE */
 646         BlockSignals(True,SIGFPE);
 647 #endif
 648
 649         /* We no longer use USR2... */
 650 #if defined(SIGUSR2)
 651         BlockSignals(True, SIGUSR2);
 652 #endif
 653
 654         if ( opt_interactive ) {
 655                 Fork = False;
 656                 log_stdout = True;
 657         }
 658
 659         if ( log_stdout && Fork ) {
 660                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
 661                 exit(1);
 662         }
 663
 664         setup_logging( argv[0], log_stdout );
 665
 666         reopen_logs();
 667
 668         DEBUG( 0, ( "Netbios nameserver version %s started.\n", SAMBA_VERSION_STRING) );
 669         DEBUGADD( 0, ( "Copyright Andrew Tridgell and the Samba Team 1994-2004\n" ) );
 670
 671         if ( !reload_nmbd_services(False) )
 672                 return(-1);
 673
 674         if(!init_names())
 675                 return -1;
 676
 677         reload_nmbd_services( True );
 678
 679         if (strequal(lp_workgroup(),"*")) {
 680                 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
 681                 exit(1);
 682         }
 683
 684         set_samba_nb_type();
 685
 686         if (!is_daemon && !is_a_socket(0)) {
 687                 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
 688                 is_daemon = True;
 689         }
 690
 691         if (is_daemon && !opt_interactive) {
 692                 DEBUG( 2, ( "Becoming a daemon.\n" ) );
 693                 become_daemon(Fork);
 694         }
 695
 696 #if HAVE_SETPGID
 697         /*
 698          * If we're interactive we want to set our own process group for
 699          * signal management.
 700          */
 701         if (opt_interactive)
 702                 setpgid( (pid_t)0, (pid_t)0 );
 703 #endif
 704
 705 #ifndef SYNC_DNS
 706         /* Setup the async dns. We do it here so it doesn't have all the other
 707                 stuff initialised and thus chewing memory and sockets */
 708         if(lp_we_are_a_wins_server() && lp_dns_proxy()) {
 709                 start_async_dns();
 710         }
 711 #endif
 712
 713         if (!directory_exist(lp_lockdir(), NULL)) {
 714                 mkdir(lp_lockdir(), 0755);
 715         }
 716
 717         pidfile_create("nmbd");
 718         message_init();
 719         message_register(MSG_FORCE_ELECTION, nmbd_message_election);
 720         message_register(MSG_WINS_NEW_ENTRY, nmbd_wins_new_entry);
 721         message_register(MSG_SHUTDOWN, nmbd_terminate);
 722         message_register(MSG_SMB_CONF_UPDATED, msg_reload_nmbd_services);
 723
 724         DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port ) );
 725
 726         if ( !open_sockets( is_daemon, global_nmb_port ) ) {
 727                 kill_async_dns_child();
 728                 return 1;
 729         }
 730
 731         /* Determine all the IP addresses we have. */
 732         load_interfaces();
 733
 734         /* Create an nmbd subnet record for each of the above. */
 735         if( False == create_subnets() ) {
 736                 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
 737                 kill_async_dns_child();
 738                 exit(1);
 739         }
 740
 741         /* Load in any static local names. */
 742         load_lmhosts_file(dyn_LMHOSTSFILE);
 743         DEBUG(3,("Loaded hosts file %s\n", dyn_LMHOSTSFILE));
 744
 745         /* If we are acting as a WINS server, initialise data structures. */
 746         if( !initialise_wins() ) {
 747                 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
 748                 kill_async_dns_child();
 749                 exit(1);
 750         }
 751
 752         /*
 753          * Register nmbd primary workgroup and nmbd names on all
 754          * the broadcast subnets, and on the WINS server (if specified).
 755          * Also initiate the startup of our primary workgroup (start
 756          * elections if we are setup as being able to be a local
 757          * master browser.
 758          */
 759
 760         if( False == register_my_workgroup_and_names() ) {
 761                 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
 762                 kill_async_dns_child();
 763                 exit(1);
 764         }
 765
 766         /* We can only take signals in the select. */
 767         BlockSignals( True, SIGTERM );
 768
 769         process();
 770
 771         if (dbf)
 772                 x_fclose(dbf);
 773         kill_async_dns_child();
 774         return(0);
 775 }