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 #if DUMP_CORE
 110 /**************************************************************************** **
 111  Prepare to dump a core file - carefully!
 112  **************************************************************************** */
 113
 114 static BOOL dump_core(void)
 115 {
 116         char *p;
 117         pstring dname;
 118         pstrcpy( dname, lp_logfile() );
 119         if ((p=strrchr_m(dname,'/')))
 120                 *p=0;
 121         pstrcat( dname, "/corefiles" );
 122         mkdir( dname, 0700 );
 123         sys_chown( dname, getuid(), getgid() );
 124         chmod( dname, 0700 );
 125         if ( chdir(dname) )
 126                 return( False );
 127         umask( ~(0700) );
 128
 129 #ifdef HAVE_GETRLIMIT
 130 #ifdef RLIMIT_CORE
 131         {
 132                 struct rlimit rlp;
 133                 getrlimit( RLIMIT_CORE, &rlp );
 134                 rlp.rlim_cur = MAX( 4*1024*1024, rlp.rlim_cur );
 135                 setrlimit( RLIMIT_CORE, &rlp );
 136                 getrlimit( RLIMIT_CORE, &rlp );
 137                 DEBUG( 3, ( "Core limits now %d %d\n", (int)rlp.rlim_cur, (int)rlp.rlim_max ) );
 138         }
 139 #endif
 140 #endif
 141
 142
 143         DEBUG(0,("Dumping core in %s\n",dname));
 144         abort();
 145         return( True );
 146 }
 147 #endif
 148
 149 /**************************************************************************** **
 150  Possibly continue after a fault.
 151  **************************************************************************** */
 152
 153 static void fault_continue(void)
 154 {
 155 #if DUMP_CORE
 156         dump_core();
 157 #endif
 158 }
 159
 160 /**************************************************************************** **
 161  Expire old names from the namelist and server list.
 162  **************************************************************************** */
 163
 164 static void expire_names_and_servers(time_t t)
 165 {
 166         static time_t lastrun = 0;
 167
 168         if ( !lastrun )
 169                 lastrun = t;
 170         if ( t < (lastrun + 5) )
 171                 return;
 172         lastrun = t;
 173
 174         /*
 175          * Expire any timed out names on all the broadcast
 176          * subnets and those registered with the WINS server.
 177          * (nmbd_namelistdb.c)
 178          */
 179
 180         expire_names(t);
 181
 182         /*
 183          * Go through all the broadcast subnets and for each
 184          * workgroup known on that subnet remove any expired
 185          * server names. If a workgroup has an empty serverlist
 186          * and has itself timed out then remove the workgroup.
 187          * (nmbd_workgroupdb.c)
 188          */
 189
 190         expire_workgroups_and_servers(t);
 191 }
 192
 193 /************************************************************************** **
 194  Reload the list of network interfaces.
 195  ************************************************************************** */
 196
 197 static BOOL reload_interfaces(time_t t)
 198 {
 199         static time_t lastt;
 200         int n;
 201         struct subnet_record *subrec;
 202
 203         if (t && ((t - lastt) < NMBD_INTERFACES_RELOAD)) return False;
 204         lastt = t;
 205
 206         if (!interfaces_changed()) return False;
 207
 208         /* the list of probed interfaces has changed, we may need to add/remove
 209            some subnets */
 210         load_interfaces();
 211
 212         /* find any interfaces that need adding */
 213         for (n=iface_count() - 1; n >= 0; n--) {
 214                 struct interface *iface = get_interface(n);
 215
 216                 /*
 217                  * We don't want to add a loopback interface, in case
 218                  * someone has added 127.0.0.1 for smbd, nmbd needs to
 219                  * ignore it here. JRA.
 220                  */
 221
 222                 if (ip_equal(iface->ip, loopback_ip)) {
 223                         DEBUG(2,("reload_interfaces: Ignoring loopback interface %s\n", inet_ntoa(iface->ip)));
 224                         continue;
 225                 }
 226
 227                 for (subrec=subnetlist; subrec; subrec=subrec->next) {
 228                         if (ip_equal(iface->ip, subrec->myip) &&
 229                             ip_equal(iface->nmask, subrec->mask_ip)) break;
 230                 }
 231
 232                 if (!subrec) {
 233                         /* it wasn't found! add it */
 234                         DEBUG(2,("Found new interface %s\n",
 235                                  inet_ntoa(iface->ip)));
 236                         subrec = make_normal_subnet(iface);
 237                         if (subrec)
 238                                 register_my_workgroup_one_subnet(subrec);
 239                 }
 240         }
 241
 242         /* find any interfaces that need deleting */
 243         for (subrec=subnetlist; subrec; subrec=subrec->next) {
 244                 for (n=iface_count() - 1; n >= 0; n--) {
 245                         struct interface *iface = get_interface(n);
 246                         if (ip_equal(iface->ip, subrec->myip) &&
 247                             ip_equal(iface->nmask, subrec->mask_ip)) break;
 248                 }
 249                 if (n == -1) {
 250                         /* oops, an interface has disapeared. This is
 251                          tricky, we don't dare actually free the
 252                          interface as it could be being used, so
 253                          instead we just wear the memory leak and
 254                          remove it from the list of interfaces without
 255                          freeing it */
 256                         DEBUG(2,("Deleting dead interface %s\n",
 257                                  inet_ntoa(subrec->myip)));
 258                         close_subnet(subrec);
 259                 }
 260         }
 261
 262         rescan_listen_set = True;
 263
 264         /* We need to shutdown if there are no subnets... */
 265         if (FIRST_SUBNET == NULL) {
 266                 DEBUG(0,("reload_interfaces: No subnets to listen to. Shutting down...\n"));
 267                 return True;
 268         }
 269         return False;
 270 }
 271
 272 /**************************************************************************** **
 273  Reload the services file.
 274  **************************************************************************** */
 275
 276 static BOOL reload_nmbd_services(BOOL test)
 277 {
 278         BOOL ret;
 279
 280         set_remote_machine_name("nmbd", False);
 281
 282         if ( lp_loaded() ) {
 283                 pstring fname;
 284                 pstrcpy( fname,lp_configfile());
 285                 if (file_exist(fname,NULL) && !strcsequal(fname,dyn_CONFIGFILE)) {
 286                         pstrcpy(dyn_CONFIGFILE,fname);
 287                         test = False;
 288                 }
 289         }
 290
 291         if ( test && !lp_file_list_changed() )
 292                 return(True);
 293
 294         ret = lp_load( dyn_CONFIGFILE, True , False, False);
 295
 296         /* perhaps the config filename is now set */
 297         if ( !test ) {
 298                 DEBUG( 3, ( "services not loaded\n" ) );
 299                 reload_nmbd_services( True );
 300         }
 301
 302         return(ret);
 303 }
 304
 305 /**************************************************************************** **
 306  * React on 'smbcontrol nmbd reload-config' in the same way as to SIGHUP
 307  * We use buf here to return BOOL result to process() when reload_interfaces()
 308  * detects that there are no subnets.
 309  **************************************************************************** */
 310
 311 static void msg_reload_nmbd_services(int msg_type, struct process_id src,
 312                                      void *buf, size_t len)
 313 {
 314         write_browse_list( 0, True );
 315         dump_all_namelists();
 316         reload_nmbd_services( True );
 317         reopen_logs();
 318
 319         if(buf) {
 320                 /* We were called from process() */
 321                 /* If reload_interfaces() returned True */
 322                 /* we need to shutdown if there are no subnets... */
 323                 /* pass this info back to process() */
 324                 *((BOOL*)buf) = reload_interfaces(0);
 325         }
 326 }
 327
 328 static void msg_nmbd_send_packet(int msg_type, struct process_id src,
 329                                  void *buf, size_t len)
 330 {
 331         struct packet_struct *p = (struct packet_struct *)buf;
 332         struct subnet_record *subrec;
 333         struct in_addr *local_ip;
 334
 335         DEBUG(10, ("Received send_packet from %d\n", procid_to_pid(&src)));
 336
 337         if (len != sizeof(struct packet_struct)) {
 338                 DEBUG(2, ("Discarding invalid packet length from %d\n",
 339                           procid_to_pid(&src)));
 340                 return;
 341         }
 342
 343         if ((p->packet_type != NMB_PACKET) &&
 344             (p->packet_type != DGRAM_PACKET)) {
 345                 DEBUG(2, ("Discarding invalid packet type from %d: %d\n",
 346                           procid_to_pid(&src), p->packet_type));
 347                 return;
 348         }
 349
 350         local_ip = iface_ip(p->ip);
 351
 352         if (local_ip == NULL) {
 353                 DEBUG(2, ("Could not find ip for packet from %d\n",
 354                           procid_to_pid(&src)));
 355                 return;
 356         }
 357
 358         subrec = FIRST_SUBNET;
 359
 360         p->fd = (p->packet_type == NMB_PACKET) ?
 361                 subrec->nmb_sock : subrec->dgram_sock;
 362
 363         for (subrec = FIRST_SUBNET; subrec != NULL;
 364              subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
 365                 if (ip_equal(*local_ip, subrec->myip)) {
 366                         p->fd = (p->packet_type == NMB_PACKET) ?
 367                                 subrec->nmb_sock : subrec->dgram_sock;
 368                         break;
 369                 }
 370         }
 371
 372         if (p->packet_type == DGRAM_PACKET) {
 373                 p->port = 138;
 374                 p->packet.dgram.header.source_ip.s_addr = local_ip->s_addr;
 375                 p->packet.dgram.header.source_port = 138;
 376         }
 377
 378         send_packet(p);
 379 }
 380
 381 /**************************************************************************** **
 382  The main select loop.
 383  **************************************************************************** */
 384
 385 static void process(void)
 386 {
 387         BOOL run_election;
 388         BOOL no_subnets;
 389
 390         while( True ) {
 391                 time_t t = time(NULL);
 392
 393                 /* Check for internal messages */
 394
 395                 message_dispatch();
 396
 397                 /*
 398                  * Check all broadcast subnets to see if
 399                  * we need to run an election on any of them.
 400                  * (nmbd_elections.c)
 401                  */
 402
 403                 run_election = check_elections();
 404
 405                 /*
 406                  * Read incoming UDP packets.
 407                  * (nmbd_packets.c)
 408                  */
 409
 410                 if(listen_for_packets(run_election))
 411                         return;
 412
 413                 /*
 414                  * Handle termination inband.
 415                  */
 416
 417                 if (got_sig_term) {
 418                         got_sig_term = 0;
 419                         terminate();
 420                 }
 421
 422                 /*
 423                  * Process all incoming packets
 424                  * read above. This calls the success and
 425                  * failure functions registered when response
 426                  * packets arrrive, and also deals with request
 427                  * packets from other sources.
 428                  * (nmbd_packets.c)
 429                  */
 430
 431                 run_packet_queue();
 432
 433                 /*
 434                  * Run any elections - initiate becoming
 435                  * a local master browser if we have won.
 436                  * (nmbd_elections.c)
 437                  */
 438
 439                 run_elections(t);
 440
 441                 /*
 442                  * Send out any broadcast announcements
 443                  * of our server names. This also announces
 444                  * the workgroup name if we are a local
 445                  * master browser.
 446                  * (nmbd_sendannounce.c)
 447                  */
 448
 449                 announce_my_server_names(t);
 450
 451                 /*
 452                  * Send out any LanMan broadcast announcements
 453                  * of our server names.
 454                  * (nmbd_sendannounce.c)
 455                  */
 456
 457                 announce_my_lm_server_names(t);
 458
 459                 /*
 460                  * If we are a local master browser, periodically
 461                  * announce ourselves to the domain master browser.
 462                  * This also deals with syncronising the domain master
 463                  * browser server lists with ourselves as a local
 464                  * master browser.
 465                  * (nmbd_sendannounce.c)
 466                  */
 467
 468                 announce_myself_to_domain_master_browser(t);
 469
 470                 /*
 471                  * Fullfill any remote announce requests.
 472                  * (nmbd_sendannounce.c)
 473                  */
 474
 475                 announce_remote(t);
 476
 477                 /*
 478                  * Fullfill any remote browse sync announce requests.
 479                  * (nmbd_sendannounce.c)
 480                  */
 481
 482                 browse_sync_remote(t);
 483
 484                 /*
 485                  * Scan the broadcast subnets, and WINS client
 486                  * namelists and refresh any that need refreshing.
 487                  * (nmbd_mynames.c)
 488                  */
 489
 490                 refresh_my_names(t);
 491
 492                 /*
 493                  * Scan the subnet namelists and server lists and
 494                  * expire thos that have timed out.
 495                  * (nmbd.c)
 496                  */
 497
 498                 expire_names_and_servers(t);
 499
 500                 /*
 501                  * Write out a snapshot of our current browse list into
 502                  * the browse.dat file. This is used by smbd to service
 503                  * incoming NetServerEnum calls - used to synchronise
 504                  * browse lists over subnets.
 505                  * (nmbd_serverlistdb.c)
 506                  */
 507
 508                 write_browse_list(t, False);
 509
 510                 /*
 511                  * If we are a domain master browser, we have a list of
 512                  * local master browsers we should synchronise browse
 513                  * lists with (these are added by an incoming local
 514                  * master browser announcement packet). Expire any of
 515                  * these that are no longer current, and pull the server
 516                  * lists from each of these known local master browsers.
 517                  * (nmbd_browsesync.c)
 518                  */
 519
 520                 dmb_expire_and_sync_browser_lists(t);
 521
 522                 /*
 523                  * Check that there is a local master browser for our
 524                  * workgroup for all our broadcast subnets. If one
 525                  * is not found, start an election (which we ourselves
 526                  * may or may not participate in, depending on the
 527                  * setting of the 'local master' parameter.
 528                  * (nmbd_elections.c)
 529                  */
 530
 531                 check_master_browser_exists(t);
 532
 533                 /*
 534                  * If we are configured as a logon server, attempt to
 535                  * register the special NetBIOS names to become such
 536                  * (WORKGROUP<1c> name) on all broadcast subnets and
 537                  * with the WINS server (if used). If we are configured
 538                  * to become a domain master browser, attempt to register
 539                  * the special NetBIOS name (WORKGROUP<1b> name) to
 540                  * become such.
 541                  * (nmbd_become_dmb.c)
 542                  */
 543
 544                 add_domain_names(t);
 545
 546                 /*
 547                  * If we are a WINS server, do any timer dependent
 548                  * processing required.
 549                  * (nmbd_winsserver.c)
 550                  */
 551
 552                 initiate_wins_processing(t);
 553
 554                 /*
 555                  * If we are a domain master browser, attempt to contact the
 556                  * WINS server to get a list of all known WORKGROUPS/DOMAINS.
 557                  * This will only work to a Samba WINS server.
 558                  * (nmbd_browsesync.c)
 559                  */
 560
 561                 if (lp_enhanced_browsing())
 562                         collect_all_workgroup_names_from_wins_server(t);
 563
 564                 /*
 565                  * Go through the response record queue and time out or re-transmit
 566                  * and expired entries.
 567                  * (nmbd_packets.c)
 568                  */
 569
 570                 retransmit_or_expire_response_records(t);
 571
 572                 /*
 573                  * check to see if any remote browse sync child processes have completed
 574                  */
 575
 576                 sync_check_completion();
 577
 578                 /*
 579                  * regularly sync with any other DMBs we know about
 580                  */
 581
 582                 if (lp_enhanced_browsing())
 583                         sync_all_dmbs(t);
 584
 585                 /*
 586                  * clear the unexpected packet queue
 587                  */
 588
 589                 clear_unexpected(t);
 590
 591                 /*
 592                  * Reload the services file if we got a sighup.
 593                  */
 594
 595                 if(reload_after_sighup) {
 596                         DEBUG( 0, ( "Got SIGHUP dumping debug info.\n" ) );
 597                         msg_reload_nmbd_services(MSG_SMB_CONF_UPDATED,
 598                                                  pid_to_procid(0), (void*) &no_subnets, 0);
 599                         if(no_subnets)
 600                                 return;
 601                         reload_after_sighup = 0;
 602                 }
 603
 604                 /* check for new network interfaces */
 605
 606                 if(reload_interfaces(t))
 607                         return;
 608
 609                 /* free up temp memory */
 610                         lp_talloc_free();
 611         }
 612 }
 613
 614 /**************************************************************************** **
 615  Open the socket communication.
 616  **************************************************************************** */
 617
 618 static BOOL open_sockets(BOOL isdaemon, int port)
 619 {
 620         /*
 621          * The sockets opened here will be used to receive broadcast
 622          * packets *only*. Interface specific sockets are opened in
 623          * make_subnet() in namedbsubnet.c. Thus we bind to the
 624          * address "0.0.0.0". The parameter 'socket address' is
 625          * now deprecated.
 626          */
 627
 628         if ( isdaemon )
 629                 ClientNMB = open_socket_in(SOCK_DGRAM, port,
 630                                            0, interpret_addr(lp_socket_address()),
 631                                            True);
 632         else
 633                 ClientNMB = 0;
 634
 635         ClientDGRAM = open_socket_in(SOCK_DGRAM, DGRAM_PORT,
 636                                            3, interpret_addr(lp_socket_address()),
 637                                            True);
 638
 639         if ( ClientNMB == -1 )
 640                 return( False );
 641
 642         /* we are never interested in SIGPIPE */
 643         BlockSignals(True,SIGPIPE);
 644
 645         set_socket_options( ClientNMB,   "SO_BROADCAST" );
 646         set_socket_options( ClientDGRAM, "SO_BROADCAST" );
 647
 648         DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
 649         return( True );
 650 }
 651
 652 /**************************************************************************** **
 653  main program
 654  **************************************************************************** */
 655  int main(int argc, const char *argv[])
 656 {
 657         pstring logfile;
 658         static BOOL opt_interactive;
 659         poptContext pc;
 660         static char *p_lmhosts = dyn_LMHOSTSFILE;
 661         struct poptOption long_options[] = {
 662         POPT_AUTOHELP
 663         {"daemon", 'D', POPT_ARG_VAL, &is_daemon, True, "Become a daemon(default)" },
 664         {"interactive", 'i', POPT_ARG_VAL, &opt_interactive, True, "Run interactive (not a daemon)" },
 665         {"foreground", 'F', POPT_ARG_VAL, &Fork, False, "Run daemon in foreground (for daemontools & etc)" },
 666         {"log-stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
 667         {"hosts", 'H', POPT_ARG_STRING, &p_lmhosts, 'H', "Load a netbios hosts file"},
 668         {"port", 'p', POPT_ARG_INT, &global_nmb_port, NMB_PORT, "Listen on the specified port" },
 669         POPT_COMMON_SAMBA
 670         { NULL }
 671         };
 672
 673         load_case_tables();
 674
 675         global_nmb_port = NMB_PORT;
 676
 677         pc = poptGetContext("nmbd", argc, argv, long_options, 0);
 678         while (poptGetNextOpt(pc) != -1) {};
 679         poptFreeContext(pc);
 680
 681         global_in_nmbd = True;
 682
 683         StartupTime = time(NULL);
 684
 685         sys_srandom(time(NULL) ^ sys_getpid());
 686
 687         if (!override_logfile) {
 688                 slprintf(logfile, sizeof(logfile)-1, "%s/log.nmbd", dyn_LOGFILEBASE);
 689                 lp_set_logfile(logfile);
 690         }
 691
 692         fault_setup((void (*)(void *))fault_continue );
 693
 694         /* POSIX demands that signals are inherited. If the invoking process has
 695          * these signals masked, we will have problems, as we won't receive them. */
 696         BlockSignals(False, SIGHUP);
 697         BlockSignals(False, SIGUSR1);
 698         BlockSignals(False, SIGTERM);
 699
 700         CatchSignal( SIGHUP,  SIGNAL_CAST sig_hup );
 701         CatchSignal( SIGTERM, SIGNAL_CAST sig_term );
 702
 703 #if defined(SIGFPE)
 704         /* we are never interested in SIGFPE */
 705         BlockSignals(True,SIGFPE);
 706 #endif
 707
 708         /* We no longer use USR2... */
 709 #if defined(SIGUSR2)
 710         BlockSignals(True, SIGUSR2);
 711 #endif
 712
 713         if ( opt_interactive ) {
 714                 Fork = False;
 715                 log_stdout = True;
 716         }
 717
 718         if ( log_stdout && Fork ) {
 719                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
 720                 exit(1);
 721         }
 722
 723         setup_logging( argv[0], log_stdout );
 724
 725         reopen_logs();
 726
 727         DEBUG( 0, ( "Netbios nameserver version %s started.\n", SAMBA_VERSION_STRING) );
 728         DEBUGADD( 0, ( "%s\n", COPYRIGHT_STARTUP_MESSAGE ) );
 729
 730         if ( !reload_nmbd_services(False) )
 731                 return(-1);
 732
 733         if(!init_names())
 734                 return -1;
 735
 736         reload_nmbd_services( True );
 737
 738         if (strequal(lp_workgroup(),"*")) {
 739                 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
 740                 exit(1);
 741         }
 742
 743         set_samba_nb_type();
 744
 745         if (!is_daemon && !is_a_socket(0)) {
 746                 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
 747                 is_daemon = True;
 748         }
 749
 750         if (is_daemon && !opt_interactive) {
 751                 DEBUG( 2, ( "Becoming a daemon.\n" ) );
 752                 become_daemon(Fork);
 753         }
 754
 755 #if HAVE_SETPGID
 756         /*
 757          * If we're interactive we want to set our own process group for
 758          * signal management.
 759          */
 760         if (opt_interactive)
 761                 setpgid( (pid_t)0, (pid_t)0 );
 762 #endif
 763
 764 #ifndef SYNC_DNS
 765         /* Setup the async dns. We do it here so it doesn't have all the other
 766                 stuff initialised and thus chewing memory and sockets */
 767         if(lp_we_are_a_wins_server() && lp_dns_proxy()) {
 768                 start_async_dns();
 769         }
 770 #endif
 771
 772         if (!directory_exist(lp_lockdir(), NULL)) {
 773                 mkdir(lp_lockdir(), 0755);
 774         }
 775
 776         pidfile_create("nmbd");
 777         message_init();
 778         message_register(MSG_FORCE_ELECTION, nmbd_message_election);
 779 #if 0
 780         /* Until winsrepl is done. */
 781         message_register(MSG_WINS_NEW_ENTRY, nmbd_wins_new_entry);
 782 #endif
 783         message_register(MSG_SHUTDOWN, nmbd_terminate);
 784         message_register(MSG_SMB_CONF_UPDATED, msg_reload_nmbd_services);
 785         message_register(MSG_SEND_PACKET, msg_nmbd_send_packet);
 786
 787         TimeInit();
 788
 789         DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port ) );
 790
 791         if ( !open_sockets( is_daemon, global_nmb_port ) ) {
 792                 kill_async_dns_child();
 793                 return 1;
 794         }
 795
 796         /* Determine all the IP addresses we have. */
 797         load_interfaces();
 798
 799         /* Create an nmbd subnet record for each of the above. */
 800         if( False == create_subnets() ) {
 801                 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
 802                 kill_async_dns_child();
 803                 exit(1);
 804         }
 805
 806         /* Load in any static local names. */
 807         load_lmhosts_file(p_lmhosts);
 808         DEBUG(3,("Loaded hosts file %s\n", p_lmhosts));
 809
 810         /* If we are acting as a WINS server, initialise data structures. */
 811         if( !initialise_wins() ) {
 812                 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
 813                 kill_async_dns_child();
 814                 exit(1);
 815         }
 816
 817         /*
 818          * Register nmbd primary workgroup and nmbd names on all
 819          * the broadcast subnets, and on the WINS server (if specified).
 820          * Also initiate the startup of our primary workgroup (start
 821          * elections if we are setup as being able to be a local
 822          * master browser.
 823          */
 824
 825         if( False == register_my_workgroup_and_names() ) {
 826                 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
 827                 kill_async_dns_child();
 828                 exit(1);
 829         }
 830
 831         /* We can only take signals in the select. */
 832         BlockSignals( True, SIGTERM );
 833
 834         process();
 835
 836         if (dbf)
 837                 x_fclose(dbf);
 838         kill_async_dns_child();
 839         return(0);
 840 }