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         gencache_stabilize();
  86
  87         pidfile_unlink();
  88
  89         exit(0);
  90 }
  91
  92 static void nmbd_sig_term_handler(struct tevent_context *ev,
  93                                   struct tevent_signal *se,
  94                                   int signum,
  95                                   int count,
  96                                   void *siginfo,
  97                                   void *private_data)
  98 {
  99         terminate();
 100 }
 101
 102 static bool nmbd_setup_sig_term_handler(void)
 103 {
 104         struct tevent_signal *se;
 105
 106         se = tevent_add_signal(nmbd_event_context(),
 107                                nmbd_event_context(),
 108                                SIGTERM, 0,
 109                                nmbd_sig_term_handler,
 110                                NULL);
 111         if (!se) {
 112                 DEBUG(0,("failed to setup SIGTERM handler"));
 113                 return false;
 114         }
 115
 116         return true;
 117 }
 118
 119 static void msg_reload_nmbd_services(struct messaging_context *msg,
 120                                      void *private_data,
 121                                      uint32_t msg_type,
 122                                      struct server_id server_id,
 123                                      DATA_BLOB *data);
 124
 125 static void nmbd_sig_hup_handler(struct tevent_context *ev,
 126                                  struct tevent_signal *se,
 127                                  int signum,
 128                                  int count,
 129                                  void *siginfo,
 130                                  void *private_data)
 131 {
 132         DEBUG(0,("Got SIGHUP dumping debug info.\n"));
 133         msg_reload_nmbd_services(nmbd_messaging_context(),
 134                                  NULL, MSG_SMB_CONF_UPDATED,
 135                                  procid_self(), NULL);
 136 }
 137
 138 static bool nmbd_setup_sig_hup_handler(void)
 139 {
 140         struct tevent_signal *se;
 141
 142         se = tevent_add_signal(nmbd_event_context(),
 143                                nmbd_event_context(),
 144                                SIGHUP, 0,
 145                                nmbd_sig_hup_handler,
 146                                NULL);
 147         if (!se) {
 148                 DEBUG(0,("failed to setup SIGHUP handler"));
 149                 return false;
 150         }
 151
 152         return true;
 153 }
 154
 155 /**************************************************************************** **
 156  Handle a SHUTDOWN message from smbcontrol.
 157  **************************************************************************** */
 158
 159 static void nmbd_terminate(struct messaging_context *msg,
 160                            void *private_data,
 161                            uint32_t msg_type,
 162                            struct server_id server_id,
 163                            DATA_BLOB *data)
 164 {
 165         terminate();
 166 }
 167
 168 /**************************************************************************** **
 169  Possibly continue after a fault.
 170  **************************************************************************** */
 171
 172 static void fault_continue(void)
 173 {
 174         dump_core();
 175 }
 176
 177 /**************************************************************************** **
 178  Expire old names from the namelist and server list.
 179  **************************************************************************** */
 180
 181 static void expire_names_and_servers(time_t t)
 182 {
 183         static time_t lastrun = 0;
 184
 185         if ( !lastrun )
 186                 lastrun = t;
 187         if ( t < (lastrun + 5) )
 188                 return;
 189         lastrun = t;
 190
 191         /*
 192          * Expire any timed out names on all the broadcast
 193          * subnets and those registered with the WINS server.
 194          * (nmbd_namelistdb.c)
 195          */
 196
 197         expire_names(t);
 198
 199         /*
 200          * Go through all the broadcast subnets and for each
 201          * workgroup known on that subnet remove any expired
 202          * server names. If a workgroup has an empty serverlist
 203          * and has itself timed out then remove the workgroup.
 204          * (nmbd_workgroupdb.c)
 205          */
 206
 207         expire_workgroups_and_servers(t);
 208 }
 209
 210 /************************************************************************** **
 211  Reload the list of network interfaces.
 212  Doesn't return until a network interface is up.
 213  ************************************************************************** */
 214
 215 static void reload_interfaces(time_t t)
 216 {
 217         static time_t lastt;
 218         int n;
 219         bool print_waiting_msg = true;
 220         struct subnet_record *subrec;
 221
 222         if (t && ((t - lastt) < NMBD_INTERFACES_RELOAD)) {
 223                 return;
 224         }
 225
 226         lastt = t;
 227
 228         if (!interfaces_changed()) {
 229                 return;
 230         }
 231
 232   try_again:
 233
 234         /* the list of probed interfaces has changed, we may need to add/remove
 235            some subnets */
 236         load_interfaces();
 237
 238         /* find any interfaces that need adding */
 239         for (n=iface_count() - 1; n >= 0; n--) {
 240                 char str[INET6_ADDRSTRLEN];
 241                 const struct interface *iface = get_interface(n);
 242                 struct in_addr ip, nmask;
 243
 244                 if (!iface) {
 245                         DEBUG(2,("reload_interfaces: failed to get interface %d\n", n));
 246                         continue;
 247                 }
 248
 249                 /* Ensure we're only dealing with IPv4 here. */
 250                 if (iface->ip.ss_family != AF_INET) {
 251                         DEBUG(2,("reload_interfaces: "
 252                                 "ignoring non IPv4 interface.\n"));
 253                         continue;
 254                 }
 255
 256                 ip = ((struct sockaddr_in *)&iface->ip)->sin_addr;
 257                 nmask = ((struct sockaddr_in *)&iface->netmask)->sin_addr;
 258
 259                 /*
 260                  * We don't want to add a loopback interface, in case
 261                  * someone has added 127.0.0.1 for smbd, nmbd needs to
 262                  * ignore it here. JRA.
 263                  */
 264
 265                 if (is_loopback_addr((struct sockaddr *)&iface->ip)) {
 266                         DEBUG(2,("reload_interfaces: Ignoring loopback "
 267                                 "interface %s\n",
 268                                 print_sockaddr(str, sizeof(str), &iface->ip) ));
 269                         continue;
 270                 }
 271
 272                 for (subrec=subnetlist; subrec; subrec=subrec->next) {
 273                         if (ip_equal_v4(ip, subrec->myip) &&
 274                             ip_equal_v4(nmask, subrec->mask_ip)) {
 275                                 break;
 276                         }
 277                 }
 278
 279                 if (!subrec) {
 280                         /* it wasn't found! add it */
 281                         DEBUG(2,("Found new interface %s\n",
 282                                  print_sockaddr(str,
 283                                          sizeof(str), &iface->ip) ));
 284                         subrec = make_normal_subnet(iface);
 285                         if (subrec)
 286                                 register_my_workgroup_one_subnet(subrec);
 287                 }
 288         }
 289
 290         /* find any interfaces that need deleting */
 291         for (subrec=subnetlist; subrec; subrec=subrec->next) {
 292                 for (n=iface_count() - 1; n >= 0; n--) {
 293                         struct interface *iface = get_interface(n);
 294                         struct in_addr ip, nmask;
 295                         if (!iface) {
 296                                 continue;
 297                         }
 298                         /* Ensure we're only dealing with IPv4 here. */
 299                         if (iface->ip.ss_family != AF_INET) {
 300                                 DEBUG(2,("reload_interfaces: "
 301                                         "ignoring non IPv4 interface.\n"));
 302                                 continue;
 303                         }
 304                         ip = ((struct sockaddr_in *)&iface->ip)->sin_addr;
 305                         nmask = ((struct sockaddr_in *)&iface->netmask)->sin_addr;
 306                         if (ip_equal_v4(ip, subrec->myip) &&
 307                             ip_equal_v4(nmask, subrec->mask_ip)) {
 308                                 break;
 309                         }
 310                 }
 311                 if (n == -1) {
 312                         /* oops, an interface has disapeared. This is
 313                          tricky, we don't dare actually free the
 314                          interface as it could be being used, so
 315                          instead we just wear the memory leak and
 316                          remove it from the list of interfaces without
 317                          freeing it */
 318                         DEBUG(2,("Deleting dead interface %s\n",
 319                                  inet_ntoa(subrec->myip)));
 320                         close_subnet(subrec);
 321                 }
 322         }
 323
 324         rescan_listen_set = True;
 325
 326         /* We need to wait if there are no subnets... */
 327         if (FIRST_SUBNET == NULL) {
 328                 void (*saved_handler)(int);
 329
 330                 if (print_waiting_msg) {
 331                         DEBUG(0,("reload_interfaces: "
 332                                 "No subnets to listen to. Waiting..\n"));
 333                         print_waiting_msg = false;
 334                 }
 335
 336                 /*
 337                  * Whilst we're waiting for an interface, allow SIGTERM to
 338                  * cause us to exit.
 339                  */
 340                 saved_handler = CatchSignal( SIGTERM, SIGNAL_CAST SIG_DFL );
 341
 342                 /* We only count IPv4, non-loopback interfaces here. */
 343                 while (iface_count_v4_nl() == 0) {
 344                         sleep(5);
 345                         load_interfaces();
 346                 }
 347
 348                 CatchSignal( SIGTERM, SIGNAL_CAST saved_handler );
 349
 350                 /*
 351                  * We got an interface, go back to blocking term.
 352                  */
 353
 354                 goto try_again;
 355         }
 356 }
 357
 358 /**************************************************************************** **
 359  Reload the services file.
 360  **************************************************************************** */
 361
 362 static bool reload_nmbd_services(bool test)
 363 {
 364         bool ret;
 365
 366         set_remote_machine_name("nmbd", False);
 367
 368         if ( lp_loaded() ) {
 369                 char *fname = lp_configfile();
 370                 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
 371                         set_dyn_CONFIGFILE(fname);
 372                         test = False;
 373                 }
 374                 TALLOC_FREE(fname);
 375         }
 376
 377         if ( test && !lp_file_list_changed() )
 378                 return(True);
 379
 380         ret = lp_load(get_dyn_CONFIGFILE(), True , False, False, True);
 381
 382         /* perhaps the config filename is now set */
 383         if ( !test ) {
 384                 DEBUG( 3, ( "services not loaded\n" ) );
 385                 reload_nmbd_services( True );
 386         }
 387
 388         return(ret);
 389 }
 390
 391 /**************************************************************************** **
 392  * React on 'smbcontrol nmbd reload-config' in the same way as to SIGHUP
 393  **************************************************************************** */
 394
 395 static void msg_reload_nmbd_services(struct messaging_context *msg,
 396                                      void *private_data,
 397                                      uint32_t msg_type,
 398                                      struct server_id server_id,
 399                                      DATA_BLOB *data)
 400 {
 401         write_browse_list( 0, True );
 402         dump_all_namelists();
 403         reload_nmbd_services( True );
 404         reopen_logs();
 405         reload_interfaces(0);
 406 }
 407
 408 static void msg_nmbd_send_packet(struct messaging_context *msg,
 409                                  void *private_data,
 410                                  uint32_t msg_type,
 411                                  struct server_id src,
 412                                  DATA_BLOB *data)
 413 {
 414         struct packet_struct *p = (struct packet_struct *)data->data;
 415         struct subnet_record *subrec;
 416         struct sockaddr_storage ss;
 417         const struct sockaddr_storage *pss;
 418         const struct in_addr *local_ip;
 419
 420         DEBUG(10, ("Received send_packet from %u\n", (unsigned int)procid_to_pid(&src)));
 421
 422         if (data->length != sizeof(struct packet_struct)) {
 423                 DEBUG(2, ("Discarding invalid packet length from %u\n",
 424                           (unsigned int)procid_to_pid(&src)));
 425                 return;
 426         }
 427
 428         if ((p->packet_type != NMB_PACKET) &&
 429             (p->packet_type != DGRAM_PACKET)) {
 430                 DEBUG(2, ("Discarding invalid packet type from %u: %d\n",
 431                           (unsigned int)procid_to_pid(&src), p->packet_type));
 432                 return;
 433         }
 434
 435         in_addr_to_sockaddr_storage(&ss, p->ip);
 436         pss = iface_ip((struct sockaddr *)&ss);
 437
 438         if (pss == NULL) {
 439                 DEBUG(2, ("Could not find ip for packet from %u\n",
 440                           (unsigned int)procid_to_pid(&src)));
 441                 return;
 442         }
 443
 444         local_ip = &((const struct sockaddr_in *)pss)->sin_addr;
 445         subrec = FIRST_SUBNET;
 446
 447         p->recv_fd = -1;
 448         p->send_fd = (p->packet_type == NMB_PACKET) ?
 449                 subrec->nmb_sock : subrec->dgram_sock;
 450
 451         for (subrec = FIRST_SUBNET; subrec != NULL;
 452              subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
 453                 if (ip_equal_v4(*local_ip, subrec->myip)) {
 454                         p->send_fd = (p->packet_type == NMB_PACKET) ?
 455                                 subrec->nmb_sock : subrec->dgram_sock;
 456                         break;
 457                 }
 458         }
 459
 460         if (p->packet_type == DGRAM_PACKET) {
 461                 p->port = 138;
 462                 p->packet.dgram.header.source_ip.s_addr = local_ip->s_addr;
 463                 p->packet.dgram.header.source_port = 138;
 464         }
 465
 466         send_packet(p);
 467 }
 468
 469 /**************************************************************************** **
 470  The main select loop.
 471  **************************************************************************** */
 472
 473 static void process(void)
 474 {
 475         bool run_election;
 476
 477         while( True ) {
 478                 time_t t = time(NULL);
 479                 TALLOC_CTX *frame = talloc_stackframe();
 480
 481                 /*
 482                  * Check all broadcast subnets to see if
 483                  * we need to run an election on any of them.
 484                  * (nmbd_elections.c)
 485                  */
 486
 487                 run_election = check_elections();
 488
 489                 /*
 490                  * Read incoming UDP packets.
 491                  * (nmbd_packets.c)
 492                  */
 493
 494                 if(listen_for_packets(run_election)) {
 495                         TALLOC_FREE(frame);
 496                         return;
 497                 }
 498
 499                 /*
 500                  * Process all incoming packets
 501                  * read above. This calls the success and
 502                  * failure functions registered when response
 503                  * packets arrrive, and also deals with request
 504                  * packets from other sources.
 505                  * (nmbd_packets.c)
 506                  */
 507
 508                 run_packet_queue();
 509
 510                 /*
 511                  * Run any elections - initiate becoming
 512                  * a local master browser if we have won.
 513                  * (nmbd_elections.c)
 514                  */
 515
 516                 run_elections(t);
 517
 518                 /*
 519                  * Send out any broadcast announcements
 520                  * of our server names. This also announces
 521                  * the workgroup name if we are a local
 522                  * master browser.
 523                  * (nmbd_sendannounce.c)
 524                  */
 525
 526                 announce_my_server_names(t);
 527
 528                 /*
 529                  * Send out any LanMan broadcast announcements
 530                  * of our server names.
 531                  * (nmbd_sendannounce.c)
 532                  */
 533
 534                 announce_my_lm_server_names(t);
 535
 536                 /*
 537                  * If we are a local master browser, periodically
 538                  * announce ourselves to the domain master browser.
 539                  * This also deals with syncronising the domain master
 540                  * browser server lists with ourselves as a local
 541                  * master browser.
 542                  * (nmbd_sendannounce.c)
 543                  */
 544
 545                 announce_myself_to_domain_master_browser(t);
 546
 547                 /*
 548                  * Fullfill any remote announce requests.
 549                  * (nmbd_sendannounce.c)
 550                  */
 551
 552                 announce_remote(t);
 553
 554                 /*
 555                  * Fullfill any remote browse sync announce requests.
 556                  * (nmbd_sendannounce.c)
 557                  */
 558
 559                 browse_sync_remote(t);
 560
 561                 /*
 562                  * Scan the broadcast subnets, and WINS client
 563                  * namelists and refresh any that need refreshing.
 564                  * (nmbd_mynames.c)
 565                  */
 566
 567                 refresh_my_names(t);
 568
 569                 /*
 570                  * Scan the subnet namelists and server lists and
 571                  * expire thos that have timed out.
 572                  * (nmbd.c)
 573                  */
 574
 575                 expire_names_and_servers(t);
 576
 577                 /*
 578                  * Write out a snapshot of our current browse list into
 579                  * the browse.dat file. This is used by smbd to service
 580                  * incoming NetServerEnum calls - used to synchronise
 581                  * browse lists over subnets.
 582                  * (nmbd_serverlistdb.c)
 583                  */
 584
 585                 write_browse_list(t, False);
 586
 587                 /*
 588                  * If we are a domain master browser, we have a list of
 589                  * local master browsers we should synchronise browse
 590                  * lists with (these are added by an incoming local
 591                  * master browser announcement packet). Expire any of
 592                  * these that are no longer current, and pull the server
 593                  * lists from each of these known local master browsers.
 594                  * (nmbd_browsesync.c)
 595                  */
 596
 597                 dmb_expire_and_sync_browser_lists(t);
 598
 599                 /*
 600                  * Check that there is a local master browser for our
 601                  * workgroup for all our broadcast subnets. If one
 602                  * is not found, start an election (which we ourselves
 603                  * may or may not participate in, depending on the
 604                  * setting of the 'local master' parameter.
 605                  * (nmbd_elections.c)
 606                  */
 607
 608                 check_master_browser_exists(t);
 609
 610                 /*
 611                  * If we are configured as a logon server, attempt to
 612                  * register the special NetBIOS names to become such
 613                  * (WORKGROUP<1c> name) on all broadcast subnets and
 614                  * with the WINS server (if used). If we are configured
 615                  * to become a domain master browser, attempt to register
 616                  * the special NetBIOS name (WORKGROUP<1b> name) to
 617                  * become such.
 618                  * (nmbd_become_dmb.c)
 619                  */
 620
 621                 add_domain_names(t);
 622
 623                 /*
 624                  * If we are a WINS server, do any timer dependent
 625                  * processing required.
 626                  * (nmbd_winsserver.c)
 627                  */
 628
 629                 initiate_wins_processing(t);
 630
 631                 /*
 632                  * If we are a domain master browser, attempt to contact the
 633                  * WINS server to get a list of all known WORKGROUPS/DOMAINS.
 634                  * This will only work to a Samba WINS server.
 635                  * (nmbd_browsesync.c)
 636                  */
 637
 638                 if (lp_enhanced_browsing())
 639                         collect_all_workgroup_names_from_wins_server(t);
 640
 641                 /*
 642                  * Go through the response record queue and time out or re-transmit
 643                  * and expired entries.
 644                  * (nmbd_packets.c)
 645                  */
 646
 647                 retransmit_or_expire_response_records(t);
 648
 649                 /*
 650                  * check to see if any remote browse sync child processes have completed
 651                  */
 652
 653                 sync_check_completion();
 654
 655                 /*
 656                  * regularly sync with any other DMBs we know about
 657                  */
 658
 659                 if (lp_enhanced_browsing())
 660                         sync_all_dmbs(t);
 661
 662                 /*
 663                  * clear the unexpected packet queue
 664                  */
 665
 666                 clear_unexpected(t);
 667
 668                 /* check for new network interfaces */
 669
 670                 reload_interfaces(t);
 671
 672                 /* free up temp memory */
 673                 TALLOC_FREE(frame);
 674         }
 675 }
 676
 677 /**************************************************************************** **
 678  Open the socket communication.
 679  **************************************************************************** */
 680
 681 static bool open_sockets(bool isdaemon, int port)
 682 {
 683         struct sockaddr_storage ss;
 684         const char *sock_addr = lp_socket_address();
 685
 686         /*
 687          * The sockets opened here will be used to receive broadcast
 688          * packets *only*. Interface specific sockets are opened in
 689          * make_subnet() in namedbsubnet.c. Thus we bind to the
 690          * address "0.0.0.0". The parameter 'socket address' is
 691          * now deprecated.
 692          */
 693
 694         if (!interpret_string_addr(&ss, sock_addr,
 695                                 AI_NUMERICHOST|AI_PASSIVE)) {
 696                 DEBUG(0,("open_sockets: unable to get socket address "
 697                         "from string %s", sock_addr));
 698                 return false;
 699         }
 700         if (ss.ss_family != AF_INET) {
 701                 DEBUG(0,("open_sockets: unable to use IPv6 socket"
 702                         "%s in nmbd\n",
 703                         sock_addr));
 704                 return false;
 705         }
 706
 707         if (isdaemon) {
 708                 ClientNMB = open_socket_in(SOCK_DGRAM, port,
 709                                            0, &ss,
 710                                            true);
 711         } else {
 712                 ClientNMB = 0;
 713         }
 714
 715         if (ClientNMB == -1) {
 716                 return false;
 717         }
 718
 719         ClientDGRAM = open_socket_in(SOCK_DGRAM, DGRAM_PORT,
 720                                            3, &ss,
 721                                            true);
 722
 723         if (ClientDGRAM == -1) {
 724                 if (ClientNMB != 0) {
 725                         close(ClientNMB);
 726                 }
 727                 return false;
 728         }
 729
 730         /* we are never interested in SIGPIPE */
 731         BlockSignals(True,SIGPIPE);
 732
 733         set_socket_options( ClientNMB,   "SO_BROADCAST" );
 734         set_socket_options( ClientDGRAM, "SO_BROADCAST" );
 735
 736         /* Ensure we're non-blocking. */
 737         set_blocking( ClientNMB, False);
 738         set_blocking( ClientDGRAM, False);
 739
 740         DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
 741         return( True );
 742 }
 743
 744 /**************************************************************************** **
 745  main program
 746  **************************************************************************** */
 747
 748  int main(int argc, const char *argv[])
 749 {
 750         static bool is_daemon;
 751         static bool opt_interactive;
 752         static bool Fork = true;
 753         static bool no_process_group;
 754         static bool log_stdout;
 755         poptContext pc;
 756         char *p_lmhosts = NULL;
 757         int opt;
 758         enum {
 759                 OPT_DAEMON = 1000,
 760                 OPT_INTERACTIVE,
 761                 OPT_FORK,
 762                 OPT_NO_PROCESS_GROUP,
 763                 OPT_LOG_STDOUT
 764         };
 765         struct poptOption long_options[] = {
 766         POPT_AUTOHELP
 767         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon(default)" },
 768         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)" },
 769         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools & etc)" },
 770         {"no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
 771         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
 772         {"hosts", 'H', POPT_ARG_STRING, &p_lmhosts, 0, "Load a netbios hosts file"},
 773         {"port", 'p', POPT_ARG_INT, &global_nmb_port, 0, "Listen on the specified port" },
 774         POPT_COMMON_SAMBA
 775         { NULL }
 776         };
 777         TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
 778
 779         load_case_tables();
 780
 781         global_nmb_port = NMB_PORT;
 782
 783         pc = poptGetContext("nmbd", argc, argv, long_options, 0);
 784         while ((opt = poptGetNextOpt(pc)) != -1) {
 785                 switch (opt) {
 786                 case OPT_DAEMON:
 787                         is_daemon = true;
 788                         break;
 789                 case OPT_INTERACTIVE:
 790                         opt_interactive = true;
 791                         break;
 792                 case OPT_FORK:
 793                         Fork = false;
 794                         break;
 795                 case OPT_NO_PROCESS_GROUP:
 796                         no_process_group = true;
 797                         break;
 798                 case OPT_LOG_STDOUT:
 799                         log_stdout = true;
 800                         break;
 801                 default:
 802                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
 803                                   poptBadOption(pc, 0), poptStrerror(opt));
 804                         poptPrintUsage(pc, stderr, 0);
 805                         exit(1);
 806                 }
 807         };
 808         poptFreeContext(pc);
 809
 810         global_in_nmbd = true;
 811
 812         StartupTime = time(NULL);
 813
 814         sys_srandom(time(NULL) ^ sys_getpid());
 815
 816         if (!override_logfile) {
 817                 char *lfile = NULL;
 818                 if (asprintf(&lfile, "%s/log.nmbd", get_dyn_LOGFILEBASE()) < 0) {
 819                         exit(1);
 820                 }
 821                 lp_set_logfile(lfile);
 822                 SAFE_FREE(lfile);
 823         }
 824
 825         fault_setup((void (*)(void *))fault_continue );
 826         dump_core_setup("nmbd");
 827
 828         /* POSIX demands that signals are inherited. If the invoking process has
 829          * these signals masked, we will have problems, as we won't receive them. */
 830         BlockSignals(False, SIGHUP);
 831         BlockSignals(False, SIGUSR1);
 832         BlockSignals(False, SIGTERM);
 833
 834 #if defined(SIGFPE)
 835         /* we are never interested in SIGFPE */
 836         BlockSignals(True,SIGFPE);
 837 #endif
 838
 839         /* We no longer use USR2... */
 840 #if defined(SIGUSR2)
 841         BlockSignals(True, SIGUSR2);
 842 #endif
 843
 844         if ( opt_interactive ) {
 845                 Fork = False;
 846                 log_stdout = True;
 847         }
 848
 849         if ( log_stdout && Fork ) {
 850                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
 851                 exit(1);
 852         }
 853
 854         setup_logging( argv[0], log_stdout );
 855
 856         reopen_logs();
 857
 858         DEBUG(0,("nmbd version %s started.\n", samba_version_string()));
 859         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
 860
 861         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
 862                 DEBUG(0, ("error opening config file\n"));
 863                 exit(1);
 864         }
 865
 866         if (nmbd_messaging_context() == NULL) {
 867                 return 1;
 868         }
 869
 870         if ( !reload_nmbd_services(False) )
 871                 return(-1);
 872
 873         if(!init_names())
 874                 return -1;
 875
 876         reload_nmbd_services( True );
 877
 878         if (strequal(lp_workgroup(),"*")) {
 879                 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
 880                 exit(1);
 881         }
 882
 883         set_samba_nb_type();
 884
 885         if (!is_daemon && !is_a_socket(0)) {
 886                 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
 887                 is_daemon = True;
 888         }
 889
 890         if (is_daemon && !opt_interactive) {
 891                 DEBUG( 2, ( "Becoming a daemon.\n" ) );
 892                 become_daemon(Fork, no_process_group);
 893         }
 894
 895 #if HAVE_SETPGID
 896         /*
 897          * If we're interactive we want to set our own process group for
 898          * signal management.
 899          */
 900         if (opt_interactive && !no_process_group)
 901                 setpgid( (pid_t)0, (pid_t)0 );
 902 #endif
 903
 904         if (nmbd_messaging_context() == NULL) {
 905                 return 1;
 906         }
 907
 908 #ifndef SYNC_DNS
 909         /* Setup the async dns. We do it here so it doesn't have all the other
 910                 stuff initialised and thus chewing memory and sockets */
 911         if(lp_we_are_a_wins_server() && lp_dns_proxy()) {
 912                 start_async_dns();
 913         }
 914 #endif
 915
 916         if (!directory_exist(lp_lockdir())) {
 917                 mkdir(lp_lockdir(), 0755);
 918         }
 919
 920         pidfile_create("nmbd");
 921
 922         if (!NT_STATUS_IS_OK(reinit_after_fork(nmbd_messaging_context(),
 923                                                nmbd_event_context(), false))) {
 924                 DEBUG(0,("reinit_after_fork() failed\n"));
 925                 exit(1);
 926         }
 927
 928         if (!nmbd_setup_sig_term_handler())
 929                 exit(1);
 930         if (!nmbd_setup_sig_hup_handler())
 931                 exit(1);
 932
 933         /* get broadcast messages */
 934         claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);
 935
 936         messaging_register(nmbd_messaging_context(), NULL,
 937                            MSG_FORCE_ELECTION, nmbd_message_election);
 938 #if 0
 939         /* Until winsrepl is done. */
 940         messaging_register(nmbd_messaging_context(), NULL,
 941                            MSG_WINS_NEW_ENTRY, nmbd_wins_new_entry);
 942 #endif
 943         messaging_register(nmbd_messaging_context(), NULL,
 944                            MSG_SHUTDOWN, nmbd_terminate);
 945         messaging_register(nmbd_messaging_context(), NULL,
 946                            MSG_SMB_CONF_UPDATED, msg_reload_nmbd_services);
 947         messaging_register(nmbd_messaging_context(), NULL,
 948                            MSG_SEND_PACKET, msg_nmbd_send_packet);
 949
 950         TimeInit();
 951
 952         DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port ) );
 953
 954         if ( !open_sockets( is_daemon, global_nmb_port ) ) {
 955                 kill_async_dns_child();
 956                 return 1;
 957         }
 958
 959         /* Determine all the IP addresses we have. */
 960         load_interfaces();
 961
 962         /* Create an nmbd subnet record for each of the above. */
 963         if( False == create_subnets() ) {
 964                 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
 965                 kill_async_dns_child();
 966                 exit(1);
 967         }
 968
 969         /* Load in any static local names. */
 970         if (p_lmhosts) {
 971                 set_dyn_LMHOSTSFILE(p_lmhosts);
 972         }
 973         load_lmhosts_file(get_dyn_LMHOSTSFILE());
 974         DEBUG(3,("Loaded hosts file %s\n", get_dyn_LMHOSTSFILE()));
 975
 976         /* If we are acting as a WINS server, initialise data structures. */
 977         if( !initialise_wins() ) {
 978                 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
 979                 kill_async_dns_child();
 980                 exit(1);
 981         }
 982
 983         /*
 984          * Register nmbd primary workgroup and nmbd names on all
 985          * the broadcast subnets, and on the WINS server (if specified).
 986          * Also initiate the startup of our primary workgroup (start
 987          * elections if we are setup as being able to be a local
 988          * master browser.
 989          */
 990
 991         if( False == register_my_workgroup_and_names() ) {
 992                 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
 993                 kill_async_dns_child();
 994                 exit(1);
 995         }
 996
 997         if (!initialize_nmbd_proxy_logon()) {
 998                 DEBUG(0,("ERROR: Failed setup nmbd_proxy_logon.\n"));
 999                 kill_async_dns_child();
1000                 exit(1);
1001         }
1002
1003         TALLOC_FREE(frame);
1004         process();
1005
1006         if (dbf)
1007                 x_fclose(dbf);
1008         kill_async_dns_child();
1009         return(0);
1010 }