source3/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 3 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, see <http://www.gnu.org/licenses/>.
  20
  21 */
  22
  23 #include "includes.h"
  24
  25 int ClientNMB       = -1;
  26 int ClientDGRAM     = -1;
  27 int global_nmb_port = -1;
  28
  29 extern bool rescan_listen_set;
  30 extern bool global_in_nmbd;
  31
  32 extern bool override_logfile;
  33
  34 /* have we found LanMan clients yet? */
  35 bool found_lm_clients = False;
  36
  37 /* what server type are we currently */
  38
  39 time_t StartupTime = 0;
  40
  41 struct event_context *nmbd_event_context(void)
  42 {
  43         static struct event_context *ctx;
  44
  45         if (!ctx && !(ctx = event_context_init(NULL))) {
  46                 smb_panic("Could not init nmbd event context");
  47         }
  48         return ctx;
  49 }
  50
  51 struct messaging_context *nmbd_messaging_context(void)
  52 {
  53         static struct messaging_context *ctx;
  54
  55         if (!ctx && !(ctx = messaging_init(NULL, server_id_self(),
  56                                            nmbd_event_context()))) {
  57                 smb_panic("Could not init nmbd messaging context");
  58         }
  59         return ctx;
  60 }
  61
  62 /**************************************************************************** **
  63  Handle a SIGTERM in band.
  64  **************************************************************************** */
  65
  66 static void terminate(void)
  67 {
  68         DEBUG(0,("Got SIGTERM: going down...\n"));
  69
  70         /* Write out wins.dat file if samba is a WINS server */
  71         wins_write_database(0,False);
  72
  73         /* Remove all SELF registered names from WINS */
  74         release_wins_names();
  75
  76         /* Announce all server entries as 0 time-to-live, 0 type. */
  77         announce_my_servers_removed();
  78
  79         /* If there was an async dns child - kill it. */
  80         kill_async_dns_child();
  81
  82         exit(0);
  83 }
  84
  85 /**************************************************************************** **
  86  Handle a SHUTDOWN message from smbcontrol.
  87  **************************************************************************** */
  88
  89 static void nmbd_terminate(struct messaging_context *msg,
  90                            void *private_data,
  91                            uint32_t msg_type,
  92                            struct server_id server_id,
  93                            DATA_BLOB *data)
  94 {
  95         terminate();
  96 }
  97
  98 /**************************************************************************** **
  99  Catch a SIGTERM signal.
 100  **************************************************************************** */
 101
 102 static SIG_ATOMIC_T got_sig_term;
 103
 104 static void sig_term(int sig)
 105 {
 106         got_sig_term = 1;
 107         sys_select_signal(SIGTERM);
 108 }
 109
 110 /**************************************************************************** **
 111  Catch a SIGHUP signal.
 112  **************************************************************************** */
 113
 114 static SIG_ATOMIC_T reload_after_sighup;
 115
 116 static void sig_hup(int sig)
 117 {
 118         reload_after_sighup = 1;
 119         sys_select_signal(SIGHUP);
 120 }
 121
 122 /**************************************************************************** **
 123  Possibly continue after a fault.
 124  **************************************************************************** */
 125
 126 static void fault_continue(void)
 127 {
 128         dump_core();
 129 }
 130
 131 /**************************************************************************** **
 132  Expire old names from the namelist and server list.
 133  **************************************************************************** */
 134
 135 static void expire_names_and_servers(time_t t)
 136 {
 137         static time_t lastrun = 0;
 138
 139         if ( !lastrun )
 140                 lastrun = t;
 141         if ( t < (lastrun + 5) )
 142                 return;
 143         lastrun = t;
 144
 145         /*
 146          * Expire any timed out names on all the broadcast
 147          * subnets and those registered with the WINS server.
 148          * (nmbd_namelistdb.c)
 149          */
 150
 151         expire_names(t);
 152
 153         /*
 154          * Go through all the broadcast subnets and for each
 155          * workgroup known on that subnet remove any expired
 156          * server names. If a workgroup has an empty serverlist
 157          * and has itself timed out then remove the workgroup.
 158          * (nmbd_workgroupdb.c)
 159          */
 160
 161         expire_workgroups_and_servers(t);
 162 }
 163
 164 /************************************************************************** **
 165  Reload the list of network interfaces.
 166  ************************************************************************** */
 167
 168 static bool reload_interfaces(time_t t)
 169 {
 170         static time_t lastt;
 171         int n;
 172         struct subnet_record *subrec;
 173
 174         if (t && ((t - lastt) < NMBD_INTERFACES_RELOAD)) return False;
 175         lastt = t;
 176
 177         if (!interfaces_changed()) return False;
 178
 179         /* the list of probed interfaces has changed, we may need to add/remove
 180            some subnets */
 181         load_interfaces();
 182
 183         /* find any interfaces that need adding */
 184         for (n=iface_count() - 1; n >= 0; n--) {
 185                 char str[INET6_ADDRSTRLEN];
 186                 const struct interface *iface = get_interface(n);
 187                 struct in_addr ip, nmask;
 188
 189                 if (!iface) {
 190                         DEBUG(2,("reload_interfaces: failed to get interface %d\n", n));
 191                         continue;
 192                 }
 193
 194                 /* Ensure we're only dealing with IPv4 here. */
 195                 if (iface->ip.ss_family != AF_INET) {
 196                         DEBUG(2,("reload_interfaces: "
 197                                 "ignoring non IPv4 interface.\n"));
 198                         continue;
 199                 }
 200
 201                 ip = ((struct sockaddr_in *)&iface->ip)->sin_addr;
 202                 nmask = ((struct sockaddr_in *)&iface->netmask)->sin_addr;
 203
 204                 /*
 205                  * We don't want to add a loopback interface, in case
 206                  * someone has added 127.0.0.1 for smbd, nmbd needs to
 207                  * ignore it here. JRA.
 208                  */
 209
 210                 if (is_loopback_addr(&iface->ip)) {
 211                         DEBUG(2,("reload_interfaces: Ignoring loopback "
 212                                 "interface %s\n",
 213                                 print_sockaddr(str, sizeof(str), &iface->ip) ));
 214                         continue;
 215                 }
 216
 217                 for (subrec=subnetlist; subrec; subrec=subrec->next) {
 218                         if (ip_equal_v4(ip, subrec->myip) &&
 219                             ip_equal_v4(nmask, subrec->mask_ip)) {
 220                                 break;
 221                         }
 222                 }
 223
 224                 if (!subrec) {
 225                         /* it wasn't found! add it */
 226                         DEBUG(2,("Found new interface %s\n",
 227                                  print_sockaddr(str,
 228                                          sizeof(str), &iface->ip) ));
 229                         subrec = make_normal_subnet(iface);
 230                         if (subrec)
 231                                 register_my_workgroup_one_subnet(subrec);
 232                 }
 233         }
 234
 235         /* find any interfaces that need deleting */
 236         for (subrec=subnetlist; subrec; subrec=subrec->next) {
 237                 for (n=iface_count() - 1; n >= 0; n--) {
 238                         struct interface *iface = get_interface(n);
 239                         struct in_addr ip, nmask;
 240                         if (!iface) {
 241                                 continue;
 242                         }
 243                         /* Ensure we're only dealing with IPv4 here. */
 244                         if (iface->ip.ss_family != AF_INET) {
 245                                 DEBUG(2,("reload_interfaces: "
 246                                         "ignoring non IPv4 interface.\n"));
 247                                 continue;
 248                         }
 249                         ip = ((struct sockaddr_in *)&iface->ip)->sin_addr;
 250                         nmask = ((struct sockaddr_in *)&iface->netmask)->sin_addr;
 251                         if (ip_equal_v4(ip, subrec->myip) &&
 252                             ip_equal_v4(nmask, subrec->mask_ip)) {
 253                                 break;
 254                         }
 255                 }
 256                 if (n == -1) {
 257                         /* oops, an interface has disapeared. This is
 258                          tricky, we don't dare actually free the
 259                          interface as it could be being used, so
 260                          instead we just wear the memory leak and
 261                          remove it from the list of interfaces without
 262                          freeing it */
 263                         DEBUG(2,("Deleting dead interface %s\n",
 264                                  inet_ntoa(subrec->myip)));
 265                         close_subnet(subrec);
 266                 }
 267         }
 268
 269         rescan_listen_set = True;
 270
 271         /* We need to shutdown if there are no subnets... */
 272         if (FIRST_SUBNET == NULL) {
 273                 DEBUG(0,("reload_interfaces: No subnets to listen to. Shutting down...\n"));
 274                 return True;
 275         }
 276         return False;
 277 }
 278
 279 /**************************************************************************** **
 280  Reload the services file.
 281  **************************************************************************** */
 282
 283 static bool reload_nmbd_services(bool test)
 284 {
 285         bool ret;
 286
 287         set_remote_machine_name("nmbd", False);
 288
 289         if ( lp_loaded() ) {
 290                 pstring fname;
 291                 pstrcpy( fname,lp_configfile());
 292                 if (file_exist(fname,NULL) && !strcsequal(fname,dyn_CONFIGFILE)) {
 293                         pstrcpy(dyn_CONFIGFILE,fname);
 294                         test = False;
 295                 }
 296         }
 297
 298         if ( test && !lp_file_list_changed() )
 299                 return(True);
 300
 301         ret = lp_load( dyn_CONFIGFILE, True , False, False, True);
 302
 303         /* perhaps the config filename is now set */
 304         if ( !test ) {
 305                 DEBUG( 3, ( "services not loaded\n" ) );
 306                 reload_nmbd_services( True );
 307         }
 308
 309         return(ret);
 310 }
 311
 312 /**************************************************************************** **
 313  * React on 'smbcontrol nmbd reload-config' in the same way as to SIGHUP
 314  * We use buf here to return bool result to process() when reload_interfaces()
 315  * detects that there are no subnets.
 316  **************************************************************************** */
 317
 318 static void msg_reload_nmbd_services(struct messaging_context *msg,
 319                                      void *private_data,
 320                                      uint32_t msg_type,
 321                                      struct server_id server_id,
 322                                      DATA_BLOB *data)
 323 {
 324         write_browse_list( 0, True );
 325         dump_all_namelists();
 326         reload_nmbd_services( True );
 327         reopen_logs();
 328
 329         if (data->data) {
 330                 /* We were called from process() */
 331                 /* If reload_interfaces() returned True */
 332                 /* we need to shutdown if there are no subnets... */
 333                 /* pass this info back to process() */
 334                 *((bool *)data->data) = reload_interfaces(0);
 335         }
 336 }
 337
 338 static void msg_nmbd_send_packet(struct messaging_context *msg,
 339                                  void *private_data,
 340                                  uint32_t msg_type,
 341                                  struct server_id src,
 342                                  DATA_BLOB *data)
 343 {
 344         struct packet_struct *p = (struct packet_struct *)data->data;
 345         struct subnet_record *subrec;
 346         struct sockaddr_storage ss;
 347         const struct sockaddr_storage *pss;
 348         const struct in_addr *local_ip;
 349
 350         DEBUG(10, ("Received send_packet from %d\n", procid_to_pid(&src)));
 351
 352         if (data->length != sizeof(struct packet_struct)) {
 353                 DEBUG(2, ("Discarding invalid packet length from %d\n",
 354                           procid_to_pid(&src)));
 355                 return;
 356         }
 357
 358         if ((p->packet_type != NMB_PACKET) &&
 359             (p->packet_type != DGRAM_PACKET)) {
 360                 DEBUG(2, ("Discarding invalid packet type from %d: %d\n",
 361                           procid_to_pid(&src), p->packet_type));
 362                 return;
 363         }
 364
 365         in_addr_to_sockaddr_storage(&ss, p->ip);
 366         pss = iface_ip(&ss);
 367
 368         if (pss == NULL) {
 369                 DEBUG(2, ("Could not find ip for packet from %d\n",
 370                           procid_to_pid(&src)));
 371                 return;
 372         }
 373
 374         local_ip = &((const struct sockaddr_in *)pss)->sin_addr;
 375         subrec = FIRST_SUBNET;
 376
 377         p->fd = (p->packet_type == NMB_PACKET) ?
 378                 subrec->nmb_sock : subrec->dgram_sock;
 379
 380         for (subrec = FIRST_SUBNET; subrec != NULL;
 381              subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
 382                 if (ip_equal_v4(*local_ip, subrec->myip)) {
 383                         p->fd = (p->packet_type == NMB_PACKET) ?
 384                                 subrec->nmb_sock : subrec->dgram_sock;
 385                         break;
 386                 }
 387         }
 388
 389         if (p->packet_type == DGRAM_PACKET) {
 390                 p->port = 138;
 391                 p->packet.dgram.header.source_ip.s_addr = local_ip->s_addr;
 392                 p->packet.dgram.header.source_port = 138;
 393         }
 394
 395         send_packet(p);
 396 }
 397
 398 /**************************************************************************** **
 399  The main select loop.
 400  **************************************************************************** */
 401
 402 static void process(void)
 403 {
 404         bool run_election;
 405         bool no_subnets;
 406
 407         while( True ) {
 408                 time_t t = time(NULL);
 409                 TALLOC_CTX *frame = talloc_stackframe();
 410
 411                 /* Check for internal messages */
 412
 413                 message_dispatch(nmbd_messaging_context());
 414
 415                 /*
 416                  * Check all broadcast subnets to see if
 417                  * we need to run an election on any of them.
 418                  * (nmbd_elections.c)
 419                  */
 420
 421                 run_election = check_elections();
 422
 423                 /*
 424                  * Read incoming UDP packets.
 425                  * (nmbd_packets.c)
 426                  */
 427
 428                 if(listen_for_packets(run_election)) {
 429                         TALLOC_FREE(frame);
 430                         return;
 431                 }
 432
 433                 /*
 434                  * Handle termination inband.
 435                  */
 436
 437                 if (got_sig_term) {
 438                         got_sig_term = 0;
 439                         terminate();
 440                 }
 441
 442                 /*
 443                  * Process all incoming packets
 444                  * read above. This calls the success and
 445                  * failure functions registered when response
 446                  * packets arrrive, and also deals with request
 447                  * packets from other sources.
 448                  * (nmbd_packets.c)
 449                  */
 450
 451                 run_packet_queue();
 452
 453                 /*
 454                  * Run any elections - initiate becoming
 455                  * a local master browser if we have won.
 456                  * (nmbd_elections.c)
 457                  */
 458
 459                 run_elections(t);
 460
 461                 /*
 462                  * Send out any broadcast announcements
 463                  * of our server names. This also announces
 464                  * the workgroup name if we are a local
 465                  * master browser.
 466                  * (nmbd_sendannounce.c)
 467                  */
 468
 469                 announce_my_server_names(t);
 470
 471                 /*
 472                  * Send out any LanMan broadcast announcements
 473                  * of our server names.
 474                  * (nmbd_sendannounce.c)
 475                  */
 476
 477                 announce_my_lm_server_names(t);
 478
 479                 /*
 480                  * If we are a local master browser, periodically
 481                  * announce ourselves to the domain master browser.
 482                  * This also deals with syncronising the domain master
 483                  * browser server lists with ourselves as a local
 484                  * master browser.
 485                  * (nmbd_sendannounce.c)
 486                  */
 487
 488                 announce_myself_to_domain_master_browser(t);
 489
 490                 /*
 491                  * Fullfill any remote announce requests.
 492                  * (nmbd_sendannounce.c)
 493                  */
 494
 495                 announce_remote(t);
 496
 497                 /*
 498                  * Fullfill any remote browse sync announce requests.
 499                  * (nmbd_sendannounce.c)
 500                  */
 501
 502                 browse_sync_remote(t);
 503
 504                 /*
 505                  * Scan the broadcast subnets, and WINS client
 506                  * namelists and refresh any that need refreshing.
 507                  * (nmbd_mynames.c)
 508                  */
 509
 510                 refresh_my_names(t);
 511
 512                 /*
 513                  * Scan the subnet namelists and server lists and
 514                  * expire thos that have timed out.
 515                  * (nmbd.c)
 516                  */
 517
 518                 expire_names_and_servers(t);
 519
 520                 /*
 521                  * Write out a snapshot of our current browse list into
 522                  * the browse.dat file. This is used by smbd to service
 523                  * incoming NetServerEnum calls - used to synchronise
 524                  * browse lists over subnets.
 525                  * (nmbd_serverlistdb.c)
 526                  */
 527
 528                 write_browse_list(t, False);
 529
 530                 /*
 531                  * If we are a domain master browser, we have a list of
 532                  * local master browsers we should synchronise browse
 533                  * lists with (these are added by an incoming local
 534                  * master browser announcement packet). Expire any of
 535                  * these that are no longer current, and pull the server
 536                  * lists from each of these known local master browsers.
 537                  * (nmbd_browsesync.c)
 538                  */
 539
 540                 dmb_expire_and_sync_browser_lists(t);
 541
 542                 /*
 543                  * Check that there is a local master browser for our
 544                  * workgroup for all our broadcast subnets. If one
 545                  * is not found, start an election (which we ourselves
 546                  * may or may not participate in, depending on the
 547                  * setting of the 'local master' parameter.
 548                  * (nmbd_elections.c)
 549                  */
 550
 551                 check_master_browser_exists(t);
 552
 553                 /*
 554                  * If we are configured as a logon server, attempt to
 555                  * register the special NetBIOS names to become such
 556                  * (WORKGROUP<1c> name) on all broadcast subnets and
 557                  * with the WINS server (if used). If we are configured
 558                  * to become a domain master browser, attempt to register
 559                  * the special NetBIOS name (WORKGROUP<1b> name) to
 560                  * become such.
 561                  * (nmbd_become_dmb.c)
 562                  */
 563
 564                 add_domain_names(t);
 565
 566                 /*
 567                  * If we are a WINS server, do any timer dependent
 568                  * processing required.
 569                  * (nmbd_winsserver.c)
 570                  */
 571
 572                 initiate_wins_processing(t);
 573
 574                 /*
 575                  * If we are a domain master browser, attempt to contact the
 576                  * WINS server to get a list of all known WORKGROUPS/DOMAINS.
 577                  * This will only work to a Samba WINS server.
 578                  * (nmbd_browsesync.c)
 579                  */
 580
 581                 if (lp_enhanced_browsing())
 582                         collect_all_workgroup_names_from_wins_server(t);
 583
 584                 /*
 585                  * Go through the response record queue and time out or re-transmit
 586                  * and expired entries.
 587                  * (nmbd_packets.c)
 588                  */
 589
 590                 retransmit_or_expire_response_records(t);
 591
 592                 /*
 593                  * check to see if any remote browse sync child processes have completed
 594                  */
 595
 596                 sync_check_completion();
 597
 598                 /*
 599                  * regularly sync with any other DMBs we know about
 600                  */
 601
 602                 if (lp_enhanced_browsing())
 603                         sync_all_dmbs(t);
 604
 605                 /*
 606                  * clear the unexpected packet queue
 607                  */
 608
 609                 clear_unexpected(t);
 610
 611                 /*
 612                  * Reload the services file if we got a sighup.
 613                  */
 614
 615                 if(reload_after_sighup) {
 616                         DATA_BLOB blob = data_blob_const(&no_subnets,
 617                                                          sizeof(no_subnets));
 618                         DEBUG( 0, ( "Got SIGHUP dumping debug info.\n" ) );
 619                         msg_reload_nmbd_services(nmbd_messaging_context(),
 620                                                  NULL, MSG_SMB_CONF_UPDATED,
 621                                                  procid_self(), &blob);
 622
 623                         if(no_subnets) {
 624                                 TALLOC_FREE(frame);
 625                                 return;
 626                         }
 627                         reload_after_sighup = 0;
 628                 }
 629
 630                 /* check for new network interfaces */
 631
 632                 if(reload_interfaces(t)) {
 633                         TALLOC_FREE(frame);
 634                         return;
 635                 }
 636
 637                 /* free up temp memory */
 638                 TALLOC_FREE(frame);
 639         }
 640 }
 641
 642 /**************************************************************************** **
 643  Open the socket communication.
 644  **************************************************************************** */
 645
 646 static bool open_sockets(bool isdaemon, int port)
 647 {
 648         struct sockaddr_storage ss;
 649         const char *sock_addr = lp_socket_address();
 650
 651         /*
 652          * The sockets opened here will be used to receive broadcast
 653          * packets *only*. Interface specific sockets are opened in
 654          * make_subnet() in namedbsubnet.c. Thus we bind to the
 655          * address "0.0.0.0". The parameter 'socket address' is
 656          * now deprecated.
 657          */
 658
 659         if (!interpret_string_addr(&ss, sock_addr,
 660                                 AI_NUMERICHOST|AI_PASSIVE)) {
 661                 DEBUG(0,("open_sockets: unable to get socket address "
 662                         "from string %s", sock_addr));
 663                 return false;
 664         }
 665         if (ss.ss_family != AF_INET) {
 666                 DEBUG(0,("open_sockets: unable to use IPv6 socket"
 667                         "%s in nmbd\n",
 668                         sock_addr));
 669                 return false;
 670         }
 671
 672         if (isdaemon) {
 673                 ClientNMB = open_socket_in(SOCK_DGRAM, port,
 674                                            0, &ss,
 675                                            true);
 676         } else {
 677                 ClientNMB = 0;
 678         }
 679
 680         ClientDGRAM = open_socket_in(SOCK_DGRAM, DGRAM_PORT,
 681                                            3, &ss,
 682                                            true);
 683
 684         if (ClientNMB == -1) {
 685                 return false;
 686         }
 687
 688         /* we are never interested in SIGPIPE */
 689         BlockSignals(True,SIGPIPE);
 690
 691         set_socket_options( ClientNMB,   "SO_BROADCAST" );
 692         set_socket_options( ClientDGRAM, "SO_BROADCAST" );
 693
 694         /* Ensure we're non-blocking. */
 695         set_blocking( ClientNMB, False);
 696         set_blocking( ClientDGRAM, False);
 697
 698         DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
 699         return( True );
 700 }
 701
 702 /**************************************************************************** **
 703  main program
 704  **************************************************************************** */
 705
 706  int main(int argc, const char *argv[])
 707 {
 708         static bool is_daemon;
 709         static bool opt_interactive;
 710         static bool Fork = true;
 711         static bool no_process_group;
 712         static bool log_stdout;
 713         pstring logfile;
 714         poptContext pc;
 715         static char *p_lmhosts = dyn_LMHOSTSFILE;
 716         int opt;
 717         enum {
 718                 OPT_DAEMON = 1000,
 719                 OPT_INTERACTIVE,
 720                 OPT_FORK,
 721                 OPT_NO_PROCESS_GROUP,
 722                 OPT_LOG_STDOUT
 723         };
 724         struct poptOption long_options[] = {
 725         POPT_AUTOHELP
 726         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon(default)" },
 727         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)" },
 728         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools & etc)" },
 729         {"no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
 730         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
 731         {"hosts", 'H', POPT_ARG_STRING, &p_lmhosts, 'H', "Load a netbios hosts file"},
 732         {"port", 'p', POPT_ARG_INT, &global_nmb_port, NMB_PORT, "Listen on the specified port" },
 733         POPT_COMMON_SAMBA
 734         { NULL }
 735         };
 736         TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
 737
 738         load_case_tables();
 739
 740         global_nmb_port = NMB_PORT;
 741
 742         pc = poptGetContext("nmbd", argc, argv, long_options, 0);
 743         while ((opt = poptGetNextOpt(pc)) != -1) {
 744                 switch (opt) {
 745                 case OPT_DAEMON:
 746                         is_daemon = true;
 747                         break;
 748                 case OPT_INTERACTIVE:
 749                         opt_interactive = true;
 750                         break;
 751                 case OPT_FORK:
 752                         Fork = false;
 753                         break;
 754                 case OPT_NO_PROCESS_GROUP:
 755                         no_process_group = true;
 756                         break;
 757                 case OPT_LOG_STDOUT:
 758                         log_stdout = true;
 759                         break;
 760                 default:
 761                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
 762                                   poptBadOption(pc, 0), poptStrerror(opt));
 763                         poptPrintUsage(pc, stderr, 0);
 764                         exit(1);
 765                 }
 766         };
 767         poptFreeContext(pc);
 768
 769         global_in_nmbd = true;
 770
 771         StartupTime = time(NULL);
 772
 773         sys_srandom(time(NULL) ^ sys_getpid());
 774
 775         if (!override_logfile) {
 776                 slprintf(logfile, sizeof(logfile)-1, "%s/log.nmbd", dyn_LOGFILEBASE);
 777                 lp_set_logfile(logfile);
 778         }
 779
 780         fault_setup((void (*)(void *))fault_continue );
 781         dump_core_setup("nmbd");
 782
 783         /* POSIX demands that signals are inherited. If the invoking process has
 784          * these signals masked, we will have problems, as we won't receive them. */
 785         BlockSignals(False, SIGHUP);
 786         BlockSignals(False, SIGUSR1);
 787         BlockSignals(False, SIGTERM);
 788
 789         CatchSignal( SIGHUP,  SIGNAL_CAST sig_hup );
 790         CatchSignal( SIGTERM, SIGNAL_CAST sig_term );
 791
 792 #if defined(SIGFPE)
 793         /* we are never interested in SIGFPE */
 794         BlockSignals(True,SIGFPE);
 795 #endif
 796
 797         /* We no longer use USR2... */
 798 #if defined(SIGUSR2)
 799         BlockSignals(True, SIGUSR2);
 800 #endif
 801
 802         if ( opt_interactive ) {
 803                 Fork = False;
 804                 log_stdout = True;
 805         }
 806
 807         if ( log_stdout && Fork ) {
 808                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
 809                 exit(1);
 810         }
 811
 812         setup_logging( argv[0], log_stdout );
 813
 814         reopen_logs();
 815
 816         DEBUG(0,("nmbd version %s started.\n", SAMBA_VERSION_STRING));
 817         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
 818
 819         if ( !reload_nmbd_services(False) )
 820                 return(-1);
 821
 822         if(!init_names())
 823                 return -1;
 824
 825         reload_nmbd_services( True );
 826
 827         if (strequal(lp_workgroup(),"*")) {
 828                 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
 829                 exit(1);
 830         }
 831
 832         set_samba_nb_type();
 833
 834         if (!is_daemon && !is_a_socket(0)) {
 835                 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
 836                 is_daemon = True;
 837         }
 838
 839         if (is_daemon && !opt_interactive) {
 840                 DEBUG( 2, ( "Becoming a daemon.\n" ) );
 841                 become_daemon(Fork, no_process_group);
 842         }
 843
 844 #if HAVE_SETPGID
 845         /*
 846          * If we're interactive we want to set our own process group for
 847          * signal management.
 848          */
 849         if (opt_interactive && !no_process_group)
 850                 setpgid( (pid_t)0, (pid_t)0 );
 851 #endif
 852
 853         if (nmbd_messaging_context() == NULL) {
 854                 return 1;
 855         }
 856
 857 #ifndef SYNC_DNS
 858         /* Setup the async dns. We do it here so it doesn't have all the other
 859                 stuff initialised and thus chewing memory and sockets */
 860         if(lp_we_are_a_wins_server() && lp_dns_proxy()) {
 861                 start_async_dns();
 862         }
 863 #endif
 864
 865         if (!directory_exist(lp_lockdir(), NULL)) {
 866                 mkdir(lp_lockdir(), 0755);
 867         }
 868
 869         pidfile_create("nmbd");
 870         messaging_register(nmbd_messaging_context(), NULL,
 871                            MSG_FORCE_ELECTION, nmbd_message_election);
 872 #if 0
 873         /* Until winsrepl is done. */
 874         messaging_register(nmbd_messaging_context(), NULL,
 875                            MSG_WINS_NEW_ENTRY, nmbd_wins_new_entry);
 876 #endif
 877         messaging_register(nmbd_messaging_context(), NULL,
 878                            MSG_SHUTDOWN, nmbd_terminate);
 879         messaging_register(nmbd_messaging_context(), NULL,
 880                            MSG_SMB_CONF_UPDATED, msg_reload_nmbd_services);
 881         messaging_register(nmbd_messaging_context(), NULL,
 882                            MSG_SEND_PACKET, msg_nmbd_send_packet);
 883
 884         TimeInit();
 885
 886         DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port ) );
 887
 888         if ( !open_sockets( is_daemon, global_nmb_port ) ) {
 889                 kill_async_dns_child();
 890                 return 1;
 891         }
 892
 893         /* Determine all the IP addresses we have. */
 894         load_interfaces();
 895
 896         /* Create an nmbd subnet record for each of the above. */
 897         if( False == create_subnets() ) {
 898                 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
 899                 kill_async_dns_child();
 900                 exit(1);
 901         }
 902
 903         /* Load in any static local names. */
 904         load_lmhosts_file(p_lmhosts);
 905         DEBUG(3,("Loaded hosts file %s\n", p_lmhosts));
 906
 907         /* If we are acting as a WINS server, initialise data structures. */
 908         if( !initialise_wins() ) {
 909                 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
 910                 kill_async_dns_child();
 911                 exit(1);
 912         }
 913
 914         /*
 915          * Register nmbd primary workgroup and nmbd names on all
 916          * the broadcast subnets, and on the WINS server (if specified).
 917          * Also initiate the startup of our primary workgroup (start
 918          * elections if we are setup as being able to be a local
 919          * master browser.
 920          */
 921
 922         if( False == register_my_workgroup_and_names() ) {
 923                 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
 924                 kill_async_dns_child();
 925                 exit(1);
 926         }
 927
 928         /* We can only take signals in the select. */
 929         BlockSignals( True, SIGTERM );
 930
 931         TALLOC_FREE(frame);
 932         process();
 933
 934         if (dbf)
 935                 x_fclose(dbf);
 936         kill_async_dns_child();
 937         return(0);
 938 }