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 == NULL) {
  56                 ctx = messaging_init(NULL, server_id_self(),
  57                                      nmbd_event_context());
  58         }
  59         if (ctx == NULL) {
  60                 DEBUG(0, ("Could not init nmbd messaging context.\n"));
  61         }
  62         return ctx;
  63 }
  64
  65 /**************************************************************************** **
  66  Handle a SIGTERM in band.
  67  **************************************************************************** */
  68
  69 static void terminate(void)
  70 {
  71         DEBUG(0,("Got SIGTERM: going down...\n"));
  72
  73         /* Write out wins.dat file if samba is a WINS server */
  74         wins_write_database(0,False);
  75
  76         /* Remove all SELF registered names from WINS */
  77         release_wins_names();
  78
  79         /* Announce all server entries as 0 time-to-live, 0 type. */
  80         announce_my_servers_removed();
  81
  82         /* If there was an async dns child - kill it. */
  83         kill_async_dns_child();
  84
  85         exit(0);
  86 }
  87
  88 /**************************************************************************** **
  89  Handle a SHUTDOWN message from smbcontrol.
  90  **************************************************************************** */
  91
  92 static void nmbd_terminate(struct messaging_context *msg,
  93                            void *private_data,
  94                            uint32_t msg_type,
  95                            struct server_id server_id,
  96                            DATA_BLOB *data)
  97 {
  98         terminate();
  99 }
 100
 101 /**************************************************************************** **
 102  Catch a SIGTERM signal.
 103  **************************************************************************** */
 104
 105 static SIG_ATOMIC_T got_sig_term;
 106
 107 static void sig_term(int sig)
 108 {
 109         got_sig_term = 1;
 110         sys_select_signal(SIGTERM);
 111 }
 112
 113 /**************************************************************************** **
 114  Catch a SIGHUP signal.
 115  **************************************************************************** */
 116
 117 static SIG_ATOMIC_T reload_after_sighup;
 118
 119 static void sig_hup(int sig)
 120 {
 121         reload_after_sighup = 1;
 122         sys_select_signal(SIGHUP);
 123 }
 124
 125 /**************************************************************************** **
 126  Possibly continue after a fault.
 127  **************************************************************************** */
 128
 129 static void fault_continue(void)
 130 {
 131         dump_core();
 132 }
 133
 134 /**************************************************************************** **
 135  Expire old names from the namelist and server list.
 136  **************************************************************************** */
 137
 138 static void expire_names_and_servers(time_t t)
 139 {
 140         static time_t lastrun = 0;
 141
 142         if ( !lastrun )
 143                 lastrun = t;
 144         if ( t < (lastrun + 5) )
 145                 return;
 146         lastrun = t;
 147
 148         /*
 149          * Expire any timed out names on all the broadcast
 150          * subnets and those registered with the WINS server.
 151          * (nmbd_namelistdb.c)
 152          */
 153
 154         expire_names(t);
 155
 156         /*
 157          * Go through all the broadcast subnets and for each
 158          * workgroup known on that subnet remove any expired
 159          * server names. If a workgroup has an empty serverlist
 160          * and has itself timed out then remove the workgroup.
 161          * (nmbd_workgroupdb.c)
 162          */
 163
 164         expire_workgroups_and_servers(t);
 165 }
 166
 167 /************************************************************************** **
 168  Reload the list of network interfaces.
 169  Doesn't return until a network interface is up.
 170  ************************************************************************** */
 171
 172 static void reload_interfaces(time_t t)
 173 {
 174         static time_t lastt;
 175         int n;
 176         bool print_waiting_msg = true;
 177         struct subnet_record *subrec;
 178
 179         if (t && ((t - lastt) < NMBD_INTERFACES_RELOAD)) {
 180                 return;
 181         }
 182
 183         lastt = t;
 184
 185         if (!interfaces_changed()) {
 186                 return;
 187         }
 188
 189   try_again:
 190
 191         /* the list of probed interfaces has changed, we may need to add/remove
 192            some subnets */
 193         load_interfaces();
 194
 195         /* find any interfaces that need adding */
 196         for (n=iface_count() - 1; n >= 0; n--) {
 197                 char str[INET6_ADDRSTRLEN];
 198                 const struct interface *iface = get_interface(n);
 199                 struct in_addr ip, nmask;
 200
 201                 if (!iface) {
 202                         DEBUG(2,("reload_interfaces: failed to get interface %d\n", n));
 203                         continue;
 204                 }
 205
 206                 /* Ensure we're only dealing with IPv4 here. */
 207                 if (iface->ip.ss_family != AF_INET) {
 208                         DEBUG(2,("reload_interfaces: "
 209                                 "ignoring non IPv4 interface.\n"));
 210                         continue;
 211                 }
 212
 213                 ip = ((struct sockaddr_in *)&iface->ip)->sin_addr;
 214                 nmask = ((struct sockaddr_in *)&iface->netmask)->sin_addr;
 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 (is_loopback_addr((struct sockaddr *)&iface->ip)) {
 223                         DEBUG(2,("reload_interfaces: Ignoring loopback "
 224                                 "interface %s\n",
 225                                 print_sockaddr(str, sizeof(str), &iface->ip) ));
 226                         continue;
 227                 }
 228
 229                 for (subrec=subnetlist; subrec; subrec=subrec->next) {
 230                         if (ip_equal_v4(ip, subrec->myip) &&
 231                             ip_equal_v4(nmask, subrec->mask_ip)) {
 232                                 break;
 233                         }
 234                 }
 235
 236                 if (!subrec) {
 237                         /* it wasn't found! add it */
 238                         DEBUG(2,("Found new interface %s\n",
 239                                  print_sockaddr(str,
 240                                          sizeof(str), &iface->ip) ));
 241                         subrec = make_normal_subnet(iface);
 242                         if (subrec)
 243                                 register_my_workgroup_one_subnet(subrec);
 244                 }
 245         }
 246
 247         /* find any interfaces that need deleting */
 248         for (subrec=subnetlist; subrec; subrec=subrec->next) {
 249                 for (n=iface_count() - 1; n >= 0; n--) {
 250                         struct interface *iface = get_interface(n);
 251                         struct in_addr ip, nmask;
 252                         if (!iface) {
 253                                 continue;
 254                         }
 255                         /* Ensure we're only dealing with IPv4 here. */
 256                         if (iface->ip.ss_family != AF_INET) {
 257                                 DEBUG(2,("reload_interfaces: "
 258                                         "ignoring non IPv4 interface.\n"));
 259                                 continue;
 260                         }
 261                         ip = ((struct sockaddr_in *)&iface->ip)->sin_addr;
 262                         nmask = ((struct sockaddr_in *)&iface->netmask)->sin_addr;
 263                         if (ip_equal_v4(ip, subrec->myip) &&
 264                             ip_equal_v4(nmask, subrec->mask_ip)) {
 265                                 break;
 266                         }
 267                 }
 268                 if (n == -1) {
 269                         /* oops, an interface has disapeared. This is
 270                          tricky, we don't dare actually free the
 271                          interface as it could be being used, so
 272                          instead we just wear the memory leak and
 273                          remove it from the list of interfaces without
 274                          freeing it */
 275                         DEBUG(2,("Deleting dead interface %s\n",
 276                                  inet_ntoa(subrec->myip)));
 277                         close_subnet(subrec);
 278                 }
 279         }
 280
 281         rescan_listen_set = True;
 282
 283         /* We need to wait if there are no subnets... */
 284         if (FIRST_SUBNET == NULL) {
 285                 void (*saved_handler)(int);
 286
 287                 if (print_waiting_msg) {
 288                         DEBUG(0,("reload_interfaces: "
 289                                 "No subnets to listen to. Waiting..\n"));
 290                         print_waiting_msg = false;
 291                 }
 292
 293                 /*
 294                  * Whilst we're waiting for an interface, allow SIGTERM to
 295                  * cause us to exit.
 296                  */
 297                 saved_handler = CatchSignal( SIGTERM, SIGNAL_CAST SIG_DFL );
 298
 299                 /* We only count IPv4, non-loopback interfaces here. */
 300                 while (iface_count_v4_nl() == 0) {
 301                         sleep(5);
 302                         load_interfaces();
 303                 }
 304
 305                 CatchSignal( SIGTERM, SIGNAL_CAST saved_handler );
 306
 307                 /*
 308                  * We got an interface, go back to blocking term.
 309                  */
 310
 311                 goto try_again;
 312         }
 313 }
 314
 315 /**************************************************************************** **
 316  Reload the services file.
 317  **************************************************************************** */
 318
 319 static bool reload_nmbd_services(bool test)
 320 {
 321         bool ret;
 322
 323         set_remote_machine_name("nmbd", False);
 324
 325         if ( lp_loaded() ) {
 326                 const char *fname = lp_configfile();
 327                 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
 328                         set_dyn_CONFIGFILE(fname);
 329                         test = False;
 330                 }
 331         }
 332
 333         if ( test && !lp_file_list_changed() )
 334                 return(True);
 335
 336         ret = lp_load(get_dyn_CONFIGFILE(), True , False, False, True);
 337
 338         /* perhaps the config filename is now set */
 339         if ( !test ) {
 340                 DEBUG( 3, ( "services not loaded\n" ) );
 341                 reload_nmbd_services( True );
 342         }
 343
 344         return(ret);
 345 }
 346
 347 /**************************************************************************** **
 348  * React on 'smbcontrol nmbd reload-config' in the same way as to SIGHUP
 349  **************************************************************************** */
 350
 351 static void msg_reload_nmbd_services(struct messaging_context *msg,
 352                                      void *private_data,
 353                                      uint32_t msg_type,
 354                                      struct server_id server_id,
 355                                      DATA_BLOB *data)
 356 {
 357         write_browse_list( 0, True );
 358         dump_all_namelists();
 359         reload_nmbd_services( True );
 360         reopen_logs();
 361         reload_interfaces(0);
 362 }
 363
 364 static void msg_nmbd_send_packet(struct messaging_context *msg,
 365                                  void *private_data,
 366                                  uint32_t msg_type,
 367                                  struct server_id src,
 368                                  DATA_BLOB *data)
 369 {
 370         struct packet_struct *p = (struct packet_struct *)data->data;
 371         struct subnet_record *subrec;
 372         struct sockaddr_storage ss;
 373         const struct sockaddr_storage *pss;
 374         const struct in_addr *local_ip;
 375
 376         DEBUG(10, ("Received send_packet from %d\n", procid_to_pid(&src)));
 377
 378         if (data->length != sizeof(struct packet_struct)) {
 379                 DEBUG(2, ("Discarding invalid packet length from %d\n",
 380                           procid_to_pid(&src)));
 381                 return;
 382         }
 383
 384         if ((p->packet_type != NMB_PACKET) &&
 385             (p->packet_type != DGRAM_PACKET)) {
 386                 DEBUG(2, ("Discarding invalid packet type from %d: %d\n",
 387                           procid_to_pid(&src), p->packet_type));
 388                 return;
 389         }
 390
 391         in_addr_to_sockaddr_storage(&ss, p->ip);
 392         pss = iface_ip((struct sockaddr *)&ss);
 393
 394         if (pss == NULL) {
 395                 DEBUG(2, ("Could not find ip for packet from %d\n",
 396                           procid_to_pid(&src)));
 397                 return;
 398         }
 399
 400         local_ip = &((const struct sockaddr_in *)pss)->sin_addr;
 401         subrec = FIRST_SUBNET;
 402
 403         p->fd = (p->packet_type == NMB_PACKET) ?
 404                 subrec->nmb_sock : subrec->dgram_sock;
 405
 406         for (subrec = FIRST_SUBNET; subrec != NULL;
 407              subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
 408                 if (ip_equal_v4(*local_ip, subrec->myip)) {
 409                         p->fd = (p->packet_type == NMB_PACKET) ?
 410                                 subrec->nmb_sock : subrec->dgram_sock;
 411                         break;
 412                 }
 413         }
 414
 415         if (p->packet_type == DGRAM_PACKET) {
 416                 p->port = 138;
 417                 p->packet.dgram.header.source_ip.s_addr = local_ip->s_addr;
 418                 p->packet.dgram.header.source_port = 138;
 419         }
 420
 421         send_packet(p);
 422 }
 423
 424 /**************************************************************************** **
 425  The main select loop.
 426  **************************************************************************** */
 427
 428 static void process(void)
 429 {
 430         bool run_election;
 431
 432         while( True ) {
 433                 time_t t = time(NULL);
 434                 TALLOC_CTX *frame = talloc_stackframe();
 435
 436                 /*
 437                  * Check all broadcast subnets to see if
 438                  * we need to run an election on any of them.
 439                  * (nmbd_elections.c)
 440                  */
 441
 442                 run_election = check_elections();
 443
 444                 /*
 445                  * Read incoming UDP packets.
 446                  * (nmbd_packets.c)
 447                  */
 448
 449                 if(listen_for_packets(run_election)) {
 450                         TALLOC_FREE(frame);
 451                         return;
 452                 }
 453
 454                 /*
 455                  * Handle termination inband.
 456                  */
 457
 458                 if (got_sig_term) {
 459                         got_sig_term = 0;
 460                         terminate();
 461                 }
 462
 463                 /*
 464                  * Process all incoming packets
 465                  * read above. This calls the success and
 466                  * failure functions registered when response
 467                  * packets arrrive, and also deals with request
 468                  * packets from other sources.
 469                  * (nmbd_packets.c)
 470                  */
 471
 472                 run_packet_queue();
 473
 474                 /*
 475                  * Run any elections - initiate becoming
 476                  * a local master browser if we have won.
 477                  * (nmbd_elections.c)
 478                  */
 479
 480                 run_elections(t);
 481
 482                 /*
 483                  * Send out any broadcast announcements
 484                  * of our server names. This also announces
 485                  * the workgroup name if we are a local
 486                  * master browser.
 487                  * (nmbd_sendannounce.c)
 488                  */
 489
 490                 announce_my_server_names(t);
 491
 492                 /*
 493                  * Send out any LanMan broadcast announcements
 494                  * of our server names.
 495                  * (nmbd_sendannounce.c)
 496                  */
 497
 498                 announce_my_lm_server_names(t);
 499
 500                 /*
 501                  * If we are a local master browser, periodically
 502                  * announce ourselves to the domain master browser.
 503                  * This also deals with syncronising the domain master
 504                  * browser server lists with ourselves as a local
 505                  * master browser.
 506                  * (nmbd_sendannounce.c)
 507                  */
 508
 509                 announce_myself_to_domain_master_browser(t);
 510
 511                 /*
 512                  * Fullfill any remote announce requests.
 513                  * (nmbd_sendannounce.c)
 514                  */
 515
 516                 announce_remote(t);
 517
 518                 /*
 519                  * Fullfill any remote browse sync announce requests.
 520                  * (nmbd_sendannounce.c)
 521                  */
 522
 523                 browse_sync_remote(t);
 524
 525                 /*
 526                  * Scan the broadcast subnets, and WINS client
 527                  * namelists and refresh any that need refreshing.
 528                  * (nmbd_mynames.c)
 529                  */
 530
 531                 refresh_my_names(t);
 532
 533                 /*
 534                  * Scan the subnet namelists and server lists and
 535                  * expire thos that have timed out.
 536                  * (nmbd.c)
 537                  */
 538
 539                 expire_names_and_servers(t);
 540
 541                 /*
 542                  * Write out a snapshot of our current browse list into
 543                  * the browse.dat file. This is used by smbd to service
 544                  * incoming NetServerEnum calls - used to synchronise
 545                  * browse lists over subnets.
 546                  * (nmbd_serverlistdb.c)
 547                  */
 548
 549                 write_browse_list(t, False);
 550
 551                 /*
 552                  * If we are a domain master browser, we have a list of
 553                  * local master browsers we should synchronise browse
 554                  * lists with (these are added by an incoming local
 555                  * master browser announcement packet). Expire any of
 556                  * these that are no longer current, and pull the server
 557                  * lists from each of these known local master browsers.
 558                  * (nmbd_browsesync.c)
 559                  */
 560
 561                 dmb_expire_and_sync_browser_lists(t);
 562
 563                 /*
 564                  * Check that there is a local master browser for our
 565                  * workgroup for all our broadcast subnets. If one
 566                  * is not found, start an election (which we ourselves
 567                  * may or may not participate in, depending on the
 568                  * setting of the 'local master' parameter.
 569                  * (nmbd_elections.c)
 570                  */
 571
 572                 check_master_browser_exists(t);
 573
 574                 /*
 575                  * If we are configured as a logon server, attempt to
 576                  * register the special NetBIOS names to become such
 577                  * (WORKGROUP<1c> name) on all broadcast subnets and
 578                  * with the WINS server (if used). If we are configured
 579                  * to become a domain master browser, attempt to register
 580                  * the special NetBIOS name (WORKGROUP<1b> name) to
 581                  * become such.
 582                  * (nmbd_become_dmb.c)
 583                  */
 584
 585                 add_domain_names(t);
 586
 587                 /*
 588                  * If we are a WINS server, do any timer dependent
 589                  * processing required.
 590                  * (nmbd_winsserver.c)
 591                  */
 592
 593                 initiate_wins_processing(t);
 594
 595                 /*
 596                  * If we are a domain master browser, attempt to contact the
 597                  * WINS server to get a list of all known WORKGROUPS/DOMAINS.
 598                  * This will only work to a Samba WINS server.
 599                  * (nmbd_browsesync.c)
 600                  */
 601
 602                 if (lp_enhanced_browsing())
 603                         collect_all_workgroup_names_from_wins_server(t);
 604
 605                 /*
 606                  * Go through the response record queue and time out or re-transmit
 607                  * and expired entries.
 608                  * (nmbd_packets.c)
 609                  */
 610
 611                 retransmit_or_expire_response_records(t);
 612
 613                 /*
 614                  * check to see if any remote browse sync child processes have completed
 615                  */
 616
 617                 sync_check_completion();
 618
 619                 /*
 620                  * regularly sync with any other DMBs we know about
 621                  */
 622
 623                 if (lp_enhanced_browsing())
 624                         sync_all_dmbs(t);
 625
 626                 /*
 627                  * clear the unexpected packet queue
 628                  */
 629
 630                 clear_unexpected(t);
 631
 632                 /*
 633                  * Reload the services file if we got a sighup.
 634                  */
 635
 636                 if(reload_after_sighup) {
 637                         DEBUG( 0, ( "Got SIGHUP dumping debug info.\n" ) );
 638                         msg_reload_nmbd_services(nmbd_messaging_context(),
 639                                                  NULL, MSG_SMB_CONF_UPDATED,
 640                                                  procid_self(), NULL);
 641
 642                         reload_after_sighup = 0;
 643                 }
 644
 645                 /* check for new network interfaces */
 646
 647                 reload_interfaces(t);
 648
 649                 /* free up temp memory */
 650                 TALLOC_FREE(frame);
 651         }
 652 }
 653
 654 /**************************************************************************** **
 655  Open the socket communication.
 656  **************************************************************************** */
 657
 658 static bool open_sockets(bool isdaemon, int port)
 659 {
 660         struct sockaddr_storage ss;
 661         const char *sock_addr = lp_socket_address();
 662
 663         /*
 664          * The sockets opened here will be used to receive broadcast
 665          * packets *only*. Interface specific sockets are opened in
 666          * make_subnet() in namedbsubnet.c. Thus we bind to the
 667          * address "0.0.0.0". The parameter 'socket address' is
 668          * now deprecated.
 669          */
 670
 671         if (!interpret_string_addr(&ss, sock_addr,
 672                                 AI_NUMERICHOST|AI_PASSIVE)) {
 673                 DEBUG(0,("open_sockets: unable to get socket address "
 674                         "from string %s", sock_addr));
 675                 return false;
 676         }
 677         if (ss.ss_family != AF_INET) {
 678                 DEBUG(0,("open_sockets: unable to use IPv6 socket"
 679                         "%s in nmbd\n",
 680                         sock_addr));
 681                 return false;
 682         }
 683
 684         if (isdaemon) {
 685                 ClientNMB = open_socket_in(SOCK_DGRAM, port,
 686                                            0, &ss,
 687                                            true);
 688         } else {
 689                 ClientNMB = 0;
 690         }
 691
 692         if (ClientNMB == -1) {
 693                 return false;
 694         }
 695
 696         ClientDGRAM = open_socket_in(SOCK_DGRAM, DGRAM_PORT,
 697                                            3, &ss,
 698                                            true);
 699
 700         if (ClientDGRAM == -1) {
 701                 if (ClientNMB != 0) {
 702                         close(ClientNMB);
 703                 }
 704                 return false;
 705         }
 706
 707         /* we are never interested in SIGPIPE */
 708         BlockSignals(True,SIGPIPE);
 709
 710         set_socket_options( ClientNMB,   "SO_BROADCAST" );
 711         set_socket_options( ClientDGRAM, "SO_BROADCAST" );
 712
 713         /* Ensure we're non-blocking. */
 714         set_blocking( ClientNMB, False);
 715         set_blocking( ClientDGRAM, False);
 716
 717         DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
 718         return( True );
 719 }
 720
 721 /**************************************************************************** **
 722  main program
 723  **************************************************************************** */
 724
 725  int main(int argc, const char *argv[])
 726 {
 727         static bool is_daemon;
 728         static bool opt_interactive;
 729         static bool Fork = true;
 730         static bool no_process_group;
 731         static bool log_stdout;
 732         poptContext pc;
 733         char *p_lmhosts = NULL;
 734         int opt;
 735         enum {
 736                 OPT_DAEMON = 1000,
 737                 OPT_INTERACTIVE,
 738                 OPT_FORK,
 739                 OPT_NO_PROCESS_GROUP,
 740                 OPT_LOG_STDOUT
 741         };
 742         struct poptOption long_options[] = {
 743         POPT_AUTOHELP
 744         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon(default)" },
 745         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)" },
 746         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools & etc)" },
 747         {"no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
 748         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
 749         {"hosts", 'H', POPT_ARG_STRING, &p_lmhosts, 'H', "Load a netbios hosts file"},
 750         {"port", 'p', POPT_ARG_INT, &global_nmb_port, NMB_PORT, "Listen on the specified port" },
 751         POPT_COMMON_SAMBA
 752         { NULL }
 753         };
 754         TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
 755
 756         load_case_tables();
 757
 758         global_nmb_port = NMB_PORT;
 759
 760         pc = poptGetContext("nmbd", argc, argv, long_options, 0);
 761         while ((opt = poptGetNextOpt(pc)) != -1) {
 762                 switch (opt) {
 763                 case OPT_DAEMON:
 764                         is_daemon = true;
 765                         break;
 766                 case OPT_INTERACTIVE:
 767                         opt_interactive = true;
 768                         break;
 769                 case OPT_FORK:
 770                         Fork = false;
 771                         break;
 772                 case OPT_NO_PROCESS_GROUP:
 773                         no_process_group = true;
 774                         break;
 775                 case OPT_LOG_STDOUT:
 776                         log_stdout = true;
 777                         break;
 778                 default:
 779                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
 780                                   poptBadOption(pc, 0), poptStrerror(opt));
 781                         poptPrintUsage(pc, stderr, 0);
 782                         exit(1);
 783                 }
 784         };
 785         poptFreeContext(pc);
 786
 787         global_in_nmbd = true;
 788
 789         StartupTime = time(NULL);
 790
 791         sys_srandom(time(NULL) ^ sys_getpid());
 792
 793         if (!override_logfile) {
 794                 char *lfile = NULL;
 795                 if (asprintf(&lfile, "%s/log.nmbd", get_dyn_LOGFILEBASE()) < 0) {
 796                         exit(1);
 797                 }
 798                 lp_set_logfile(lfile);
 799                 SAFE_FREE(lfile);
 800         }
 801
 802         fault_setup((void (*)(void *))fault_continue );
 803         dump_core_setup("nmbd");
 804
 805         /* POSIX demands that signals are inherited. If the invoking process has
 806          * these signals masked, we will have problems, as we won't receive them. */
 807         BlockSignals(False, SIGHUP);
 808         BlockSignals(False, SIGUSR1);
 809         BlockSignals(False, SIGTERM);
 810
 811         CatchSignal( SIGHUP,  SIGNAL_CAST sig_hup );
 812         CatchSignal( SIGTERM, SIGNAL_CAST sig_term );
 813
 814 #if defined(SIGFPE)
 815         /* we are never interested in SIGFPE */
 816         BlockSignals(True,SIGFPE);
 817 #endif
 818
 819         /* We no longer use USR2... */
 820 #if defined(SIGUSR2)
 821         BlockSignals(True, SIGUSR2);
 822 #endif
 823
 824         if ( opt_interactive ) {
 825                 Fork = False;
 826                 log_stdout = True;
 827         }
 828
 829         if ( log_stdout && Fork ) {
 830                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
 831                 exit(1);
 832         }
 833
 834         setup_logging( argv[0], log_stdout );
 835
 836         reopen_logs();
 837
 838         DEBUG(0,("nmbd version %s started.\n", samba_version_string()));
 839         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
 840
 841         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
 842                 DEBUG(0, ("error opening config file\n"));
 843                 exit(1);
 844         }
 845
 846         if (nmbd_messaging_context() == NULL) {
 847                 return 1;
 848         }
 849
 850         if ( !reload_nmbd_services(False) )
 851                 return(-1);
 852
 853         if(!init_names())
 854                 return -1;
 855
 856         reload_nmbd_services( True );
 857
 858         if (strequal(lp_workgroup(),"*")) {
 859                 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
 860                 exit(1);
 861         }
 862
 863         set_samba_nb_type();
 864
 865         if (!is_daemon && !is_a_socket(0)) {
 866                 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
 867                 is_daemon = True;
 868         }
 869
 870         if (is_daemon && !opt_interactive) {
 871                 DEBUG( 2, ( "Becoming a daemon.\n" ) );
 872                 become_daemon(Fork, no_process_group);
 873         }
 874
 875 #if HAVE_SETPGID
 876         /*
 877          * If we're interactive we want to set our own process group for
 878          * signal management.
 879          */
 880         if (opt_interactive && !no_process_group)
 881                 setpgid( (pid_t)0, (pid_t)0 );
 882 #endif
 883
 884         if (nmbd_messaging_context() == NULL) {
 885                 return 1;
 886         }
 887
 888 #ifndef SYNC_DNS
 889         /* Setup the async dns. We do it here so it doesn't have all the other
 890                 stuff initialised and thus chewing memory and sockets */
 891         if(lp_we_are_a_wins_server() && lp_dns_proxy()) {
 892                 start_async_dns();
 893         }
 894 #endif
 895
 896         if (!directory_exist(lp_lockdir())) {
 897                 mkdir(lp_lockdir(), 0755);
 898         }
 899
 900         pidfile_create("nmbd");
 901
 902         if (!reinit_after_fork(nmbd_messaging_context(),
 903                                nmbd_event_context(), false)) {
 904                 DEBUG(0,("reinit_after_fork() failed\n"));
 905                 exit(1);
 906         }
 907
 908         /* get broadcast messages */
 909         claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);
 910
 911         messaging_register(nmbd_messaging_context(), NULL,
 912                            MSG_FORCE_ELECTION, nmbd_message_election);
 913 #if 0
 914         /* Until winsrepl is done. */
 915         messaging_register(nmbd_messaging_context(), NULL,
 916                            MSG_WINS_NEW_ENTRY, nmbd_wins_new_entry);
 917 #endif
 918         messaging_register(nmbd_messaging_context(), NULL,
 919                            MSG_SHUTDOWN, nmbd_terminate);
 920         messaging_register(nmbd_messaging_context(), NULL,
 921                            MSG_SMB_CONF_UPDATED, msg_reload_nmbd_services);
 922         messaging_register(nmbd_messaging_context(), NULL,
 923                            MSG_SEND_PACKET, msg_nmbd_send_packet);
 924
 925         TimeInit();
 926
 927         DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port ) );
 928
 929         if ( !open_sockets( is_daemon, global_nmb_port ) ) {
 930                 kill_async_dns_child();
 931                 return 1;
 932         }
 933
 934         /* Determine all the IP addresses we have. */
 935         load_interfaces();
 936
 937         /* Create an nmbd subnet record for each of the above. */
 938         if( False == create_subnets() ) {
 939                 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
 940                 kill_async_dns_child();
 941                 exit(1);
 942         }
 943
 944         /* Load in any static local names. */
 945         if (p_lmhosts) {
 946                 set_dyn_LMHOSTSFILE(p_lmhosts);
 947         }
 948         load_lmhosts_file(get_dyn_LMHOSTSFILE());
 949         DEBUG(3,("Loaded hosts file %s\n", get_dyn_LMHOSTSFILE()));
 950
 951         /* If we are acting as a WINS server, initialise data structures. */
 952         if( !initialise_wins() ) {
 953                 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
 954                 kill_async_dns_child();
 955                 exit(1);
 956         }
 957
 958         /*
 959          * Register nmbd primary workgroup and nmbd names on all
 960          * the broadcast subnets, and on the WINS server (if specified).
 961          * Also initiate the startup of our primary workgroup (start
 962          * elections if we are setup as being able to be a local
 963          * master browser.
 964          */
 965
 966         if( False == register_my_workgroup_and_names() ) {
 967                 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
 968                 kill_async_dns_child();
 969                 exit(1);
 970         }
 971
 972         TALLOC_FREE(frame);
 973         process();
 974
 975         if (dbf)
 976                 x_fclose(dbf);
 977         kill_async_dns_child();
 978         return(0);
 979 }