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 #include "librpc/gen_ndr/messaging.h"
  25
  26 int ClientNMB       = -1;
  27 int ClientDGRAM     = -1;
  28 int global_nmb_port = -1;
  29
  30 extern bool rescan_listen_set;
  31 extern bool global_in_nmbd;
  32
  33 extern bool override_logfile;
  34
  35 /* have we found LanMan clients yet? */
  36 bool found_lm_clients = False;
  37
  38 /* what server type are we currently */
  39
  40 time_t StartupTime = 0;
  41
  42 struct event_context *nmbd_event_context(void)
  43 {
  44         static struct event_context *ctx;
  45
  46         if (!ctx && !(ctx = event_context_init(NULL))) {
  47                 smb_panic("Could not init nmbd event context");
  48         }
  49         return ctx;
  50 }
  51
  52 struct messaging_context *nmbd_messaging_context(void)
  53 {
  54         static struct messaging_context *ctx;
  55
  56         if (ctx == NULL) {
  57                 ctx = messaging_init(NULL, procid_self(),
  58                                      nmbd_event_context());
  59         }
  60         if (ctx == NULL) {
  61                 DEBUG(0, ("Could not init nmbd messaging context.\n"));
  62         }
  63         return ctx;
  64 }
  65
  66 /**************************************************************************** **
  67  Handle a SIGTERM in band.
  68  **************************************************************************** */
  69
  70 static void terminate(void)
  71 {
  72         DEBUG(0,("Got SIGTERM: going down...\n"));
  73
  74         /* Write out wins.dat file if samba is a WINS server */
  75         wins_write_database(0,False);
  76
  77         /* Remove all SELF registered names from WINS */
  78         release_wins_names();
  79
  80         /* Announce all server entries as 0 time-to-live, 0 type. */
  81         announce_my_servers_removed();
  82
  83         /* If there was an async dns child - kill it. */
  84         kill_async_dns_child();
  85
  86         gencache_stabilize();
  87         serverid_deregister_self();
  88
  89         pidfile_unlink();
  90
  91         exit(0);
  92 }
  93
  94 static void nmbd_sig_term_handler(struct tevent_context *ev,
  95                                   struct tevent_signal *se,
  96                                   int signum,
  97                                   int count,
  98                                   void *siginfo,
  99                                   void *private_data)
 100 {
 101         terminate();
 102 }
 103
 104 static bool nmbd_setup_sig_term_handler(void)
 105 {
 106         struct tevent_signal *se;
 107
 108         se = tevent_add_signal(nmbd_event_context(),
 109                                nmbd_event_context(),
 110                                SIGTERM, 0,
 111                                nmbd_sig_term_handler,
 112                                NULL);
 113         if (!se) {
 114                 DEBUG(0,("failed to setup SIGTERM handler"));
 115                 return false;
 116         }
 117
 118         return true;
 119 }
 120
 121 static void msg_reload_nmbd_services(struct messaging_context *msg,
 122                                      void *private_data,
 123                                      uint32_t msg_type,
 124                                      struct server_id server_id,
 125                                      DATA_BLOB *data);
 126
 127 static void nmbd_sig_hup_handler(struct tevent_context *ev,
 128                                  struct tevent_signal *se,
 129                                  int signum,
 130                                  int count,
 131                                  void *siginfo,
 132                                  void *private_data)
 133 {
 134         DEBUG(0,("Got SIGHUP dumping debug info.\n"));
 135         msg_reload_nmbd_services(nmbd_messaging_context(),
 136                                  NULL, MSG_SMB_CONF_UPDATED,
 137                                  procid_self(), NULL);
 138 }
 139
 140 static bool nmbd_setup_sig_hup_handler(void)
 141 {
 142         struct tevent_signal *se;
 143
 144         se = tevent_add_signal(nmbd_event_context(),
 145                                nmbd_event_context(),
 146                                SIGHUP, 0,
 147                                nmbd_sig_hup_handler,
 148                                NULL);
 149         if (!se) {
 150                 DEBUG(0,("failed to setup SIGHUP handler"));
 151                 return false;
 152         }
 153
 154         return true;
 155 }
 156
 157 /**************************************************************************** **
 158  Handle a SHUTDOWN message from smbcontrol.
 159  **************************************************************************** */
 160
 161 static void nmbd_terminate(struct messaging_context *msg,
 162                            void *private_data,
 163                            uint32_t msg_type,
 164                            struct server_id server_id,
 165                            DATA_BLOB *data)
 166 {
 167         terminate();
 168 }
 169
 170 /**************************************************************************** **
 171  Possibly continue after a fault.
 172  **************************************************************************** */
 173
 174 static void fault_continue(void)
 175 {
 176         dump_core();
 177 }
 178
 179 /**************************************************************************** **
 180  Expire old names from the namelist and server list.
 181  **************************************************************************** */
 182
 183 static void expire_names_and_servers(time_t t)
 184 {
 185         static time_t lastrun = 0;
 186
 187         if ( !lastrun )
 188                 lastrun = t;
 189         if ( t < (lastrun + 5) )
 190                 return;
 191         lastrun = t;
 192
 193         /*
 194          * Expire any timed out names on all the broadcast
 195          * subnets and those registered with the WINS server.
 196          * (nmbd_namelistdb.c)
 197          */
 198
 199         expire_names(t);
 200
 201         /*
 202          * Go through all the broadcast subnets and for each
 203          * workgroup known on that subnet remove any expired
 204          * server names. If a workgroup has an empty serverlist
 205          * and has itself timed out then remove the workgroup.
 206          * (nmbd_workgroupdb.c)
 207          */
 208
 209         expire_workgroups_and_servers(t);
 210 }
 211
 212 /************************************************************************** **
 213  Reload the list of network interfaces.
 214  Doesn't return until a network interface is up.
 215  ************************************************************************** */
 216
 217 static void reload_interfaces(time_t t)
 218 {
 219         static time_t lastt;
 220         int n;
 221         bool print_waiting_msg = true;
 222         struct subnet_record *subrec;
 223
 224         if (t && ((t - lastt) < NMBD_INTERFACES_RELOAD)) {
 225                 return;
 226         }
 227
 228         lastt = t;
 229
 230         if (!interfaces_changed()) {
 231                 return;
 232         }
 233
 234   try_again:
 235
 236         /* the list of probed interfaces has changed, we may need to add/remove
 237            some subnets */
 238         load_interfaces();
 239
 240         /* find any interfaces that need adding */
 241         for (n=iface_count() - 1; n >= 0; n--) {
 242                 char str[INET6_ADDRSTRLEN];
 243                 const struct interface *iface = get_interface(n);
 244                 struct in_addr ip, nmask;
 245
 246                 if (!iface) {
 247                         DEBUG(2,("reload_interfaces: failed to get interface %d\n", n));
 248                         continue;
 249                 }
 250
 251                 /* Ensure we're only dealing with IPv4 here. */
 252                 if (iface->ip.ss_family != AF_INET) {
 253                         DEBUG(2,("reload_interfaces: "
 254                                 "ignoring non IPv4 interface.\n"));
 255                         continue;
 256                 }
 257
 258                 ip = ((struct sockaddr_in *)&iface->ip)->sin_addr;
 259                 nmask = ((struct sockaddr_in *)&iface->netmask)->sin_addr;
 260
 261                 /*
 262                  * We don't want to add a loopback interface, in case
 263                  * someone has added 127.0.0.1 for smbd, nmbd needs to
 264                  * ignore it here. JRA.
 265                  */
 266
 267                 if (is_loopback_addr((struct sockaddr *)&iface->ip)) {
 268                         DEBUG(2,("reload_interfaces: Ignoring loopback "
 269                                 "interface %s\n",
 270                                 print_sockaddr(str, sizeof(str), &iface->ip) ));
 271                         continue;
 272                 }
 273
 274                 for (subrec=subnetlist; subrec; subrec=subrec->next) {
 275                         if (ip_equal_v4(ip, subrec->myip) &&
 276                             ip_equal_v4(nmask, subrec->mask_ip)) {
 277                                 break;
 278                         }
 279                 }
 280
 281                 if (!subrec) {
 282                         /* it wasn't found! add it */
 283                         DEBUG(2,("Found new interface %s\n",
 284                                  print_sockaddr(str,
 285                                          sizeof(str), &iface->ip) ));
 286                         subrec = make_normal_subnet(iface);
 287                         if (subrec)
 288                                 register_my_workgroup_one_subnet(subrec);
 289                 }
 290         }
 291
 292         /* find any interfaces that need deleting */
 293         for (subrec=subnetlist; subrec; subrec=subrec->next) {
 294                 for (n=iface_count() - 1; n >= 0; n--) {
 295                         struct interface *iface = get_interface(n);
 296                         struct in_addr ip, nmask;
 297                         if (!iface) {
 298                                 continue;
 299                         }
 300                         /* Ensure we're only dealing with IPv4 here. */
 301                         if (iface->ip.ss_family != AF_INET) {
 302                                 DEBUG(2,("reload_interfaces: "
 303                                         "ignoring non IPv4 interface.\n"));
 304                                 continue;
 305                         }
 306                         ip = ((struct sockaddr_in *)&iface->ip)->sin_addr;
 307                         nmask = ((struct sockaddr_in *)&iface->netmask)->sin_addr;
 308                         if (ip_equal_v4(ip, subrec->myip) &&
 309                             ip_equal_v4(nmask, subrec->mask_ip)) {
 310                                 break;
 311                         }
 312                 }
 313                 if (n == -1) {
 314                         /* oops, an interface has disapeared. This is
 315                          tricky, we don't dare actually free the
 316                          interface as it could be being used, so
 317                          instead we just wear the memory leak and
 318                          remove it from the list of interfaces without
 319                          freeing it */
 320                         DEBUG(2,("Deleting dead interface %s\n",
 321                                  inet_ntoa(subrec->myip)));
 322                         close_subnet(subrec);
 323                 }
 324         }
 325
 326         rescan_listen_set = True;
 327
 328         /* We need to wait if there are no subnets... */
 329         if (FIRST_SUBNET == NULL) {
 330                 void (*saved_handler)(int);
 331
 332                 if (print_waiting_msg) {
 333                         DEBUG(0,("reload_interfaces: "
 334                                 "No subnets to listen to. Waiting..\n"));
 335                         print_waiting_msg = false;
 336                 }
 337
 338                 /*
 339                  * Whilst we're waiting for an interface, allow SIGTERM to
 340                  * cause us to exit.
 341                  */
 342                 saved_handler = CatchSignal(SIGTERM, SIG_DFL);
 343
 344                 /* We only count IPv4, non-loopback interfaces here. */
 345                 while (iface_count_v4_nl() == 0) {
 346                         sleep(5);
 347                         load_interfaces();
 348                 }
 349
 350                 CatchSignal(SIGTERM, saved_handler);
 351
 352                 /*
 353                  * We got an interface, go back to blocking term.
 354                  */
 355
 356                 goto try_again;
 357         }
 358 }
 359
 360 /**************************************************************************** **
 361  Reload the services file.
 362  **************************************************************************** */
 363
 364 static bool reload_nmbd_services(bool test)
 365 {
 366         bool ret;
 367
 368         set_remote_machine_name("nmbd", False);
 369
 370         if ( lp_loaded() ) {
 371                 const char *fname = lp_configfile();
 372                 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
 373                         set_dyn_CONFIGFILE(fname);
 374                         test = False;
 375                 }
 376         }
 377
 378         if ( test && !lp_file_list_changed() )
 379                 return(True);
 380
 381         ret = lp_load(get_dyn_CONFIGFILE(), True , False, False, True);
 382
 383         /* perhaps the config filename is now set */
 384         if ( !test ) {
 385                 DEBUG( 3, ( "services not loaded\n" ) );
 386                 reload_nmbd_services( True );
 387         }
 388
 389         return(ret);
 390 }
 391
 392 /**************************************************************************** **
 393  * React on 'smbcontrol nmbd reload-config' in the same way as to SIGHUP
 394  **************************************************************************** */
 395
 396 static void msg_reload_nmbd_services(struct messaging_context *msg,
 397                                      void *private_data,
 398                                      uint32_t msg_type,
 399                                      struct server_id server_id,
 400                                      DATA_BLOB *data)
 401 {
 402         write_browse_list( 0, True );
 403         dump_all_namelists();
 404         reload_nmbd_services( True );
 405         reopen_logs();
 406         reload_interfaces(0);
 407 }
 408
 409 static void msg_nmbd_send_packet(struct messaging_context *msg,
 410                                  void *private_data,
 411                                  uint32_t msg_type,
 412                                  struct server_id src,
 413                                  DATA_BLOB *data)
 414 {
 415         struct packet_struct *p = (struct packet_struct *)data->data;
 416         struct subnet_record *subrec;
 417         struct sockaddr_storage ss;
 418         const struct sockaddr_storage *pss;
 419         const struct in_addr *local_ip;
 420
 421         DEBUG(10, ("Received send_packet from %u\n", (unsigned int)procid_to_pid(&src)));
 422
 423         if (data->length != sizeof(struct packet_struct)) {
 424                 DEBUG(2, ("Discarding invalid packet length from %u\n",
 425                           (unsigned int)procid_to_pid(&src)));
 426                 return;
 427         }
 428
 429         if ((p->packet_type != NMB_PACKET) &&
 430             (p->packet_type != DGRAM_PACKET)) {
 431                 DEBUG(2, ("Discarding invalid packet type from %u: %d\n",
 432                           (unsigned int)procid_to_pid(&src), p->packet_type));
 433                 return;
 434         }
 435
 436         in_addr_to_sockaddr_storage(&ss, p->ip);
 437         pss = iface_ip((struct sockaddr *)&ss);
 438
 439         if (pss == NULL) {
 440                 DEBUG(2, ("Could not find ip for packet from %u\n",
 441                           (unsigned int)procid_to_pid(&src)));
 442                 return;
 443         }
 444
 445         local_ip = &((const struct sockaddr_in *)pss)->sin_addr;
 446         subrec = FIRST_SUBNET;
 447
 448         p->recv_fd = -1;
 449         p->send_fd = (p->packet_type == NMB_PACKET) ?
 450                 subrec->nmb_sock : subrec->dgram_sock;
 451
 452         for (subrec = FIRST_SUBNET; subrec != NULL;
 453              subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
 454                 if (ip_equal_v4(*local_ip, subrec->myip)) {
 455                         p->send_fd = (p->packet_type == NMB_PACKET) ?
 456                                 subrec->nmb_sock : subrec->dgram_sock;
 457                         break;
 458                 }
 459         }
 460
 461         if (p->packet_type == DGRAM_PACKET) {
 462                 p->port = 138;
 463                 p->packet.dgram.header.source_ip.s_addr = local_ip->s_addr;
 464                 p->packet.dgram.header.source_port = 138;
 465         }
 466
 467         send_packet(p);
 468 }
 469
 470 /**************************************************************************** **
 471  The main select loop.
 472  **************************************************************************** */
 473
 474 static void process(void)
 475 {
 476         bool run_election;
 477
 478         while( True ) {
 479                 time_t t = time(NULL);
 480                 TALLOC_CTX *frame = talloc_stackframe();
 481
 482                 /*
 483                  * Check all broadcast subnets to see if
 484                  * we need to run an election on any of them.
 485                  * (nmbd_elections.c)
 486                  */
 487
 488                 run_election = check_elections();
 489
 490                 /*
 491                  * Read incoming UDP packets.
 492                  * (nmbd_packets.c)
 493                  */
 494
 495                 if(listen_for_packets(run_election)) {
 496                         TALLOC_FREE(frame);
 497                         return;
 498                 }
 499
 500                 /*
 501                  * Process all incoming packets
 502                  * read above. This calls the success and
 503                  * failure functions registered when response
 504                  * packets arrrive, and also deals with request
 505                  * packets from other sources.
 506                  * (nmbd_packets.c)
 507                  */
 508
 509                 run_packet_queue();
 510
 511                 /*
 512                  * Run any elections - initiate becoming
 513                  * a local master browser if we have won.
 514                  * (nmbd_elections.c)
 515                  */
 516
 517                 run_elections(t);
 518
 519                 /*
 520                  * Send out any broadcast announcements
 521                  * of our server names. This also announces
 522                  * the workgroup name if we are a local
 523                  * master browser.
 524                  * (nmbd_sendannounce.c)
 525                  */
 526
 527                 announce_my_server_names(t);
 528
 529                 /*
 530                  * Send out any LanMan broadcast announcements
 531                  * of our server names.
 532                  * (nmbd_sendannounce.c)
 533                  */
 534
 535                 announce_my_lm_server_names(t);
 536
 537                 /*
 538                  * If we are a local master browser, periodically
 539                  * announce ourselves to the domain master browser.
 540                  * This also deals with syncronising the domain master
 541                  * browser server lists with ourselves as a local
 542                  * master browser.
 543                  * (nmbd_sendannounce.c)
 544                  */
 545
 546                 announce_myself_to_domain_master_browser(t);
 547
 548                 /*
 549                  * Fullfill any remote announce requests.
 550                  * (nmbd_sendannounce.c)
 551                  */
 552
 553                 announce_remote(t);
 554
 555                 /*
 556                  * Fullfill any remote browse sync announce requests.
 557                  * (nmbd_sendannounce.c)
 558                  */
 559
 560                 browse_sync_remote(t);
 561
 562                 /*
 563                  * Scan the broadcast subnets, and WINS client
 564                  * namelists and refresh any that need refreshing.
 565                  * (nmbd_mynames.c)
 566                  */
 567
 568                 refresh_my_names(t);
 569
 570                 /*
 571                  * Scan the subnet namelists and server lists and
 572                  * expire thos that have timed out.
 573                  * (nmbd.c)
 574                  */
 575
 576                 expire_names_and_servers(t);
 577
 578                 /*
 579                  * Write out a snapshot of our current browse list into
 580                  * the browse.dat file. This is used by smbd to service
 581                  * incoming NetServerEnum calls - used to synchronise
 582                  * browse lists over subnets.
 583                  * (nmbd_serverlistdb.c)
 584                  */
 585
 586                 write_browse_list(t, False);
 587
 588                 /*
 589                  * If we are a domain master browser, we have a list of
 590                  * local master browsers we should synchronise browse
 591                  * lists with (these are added by an incoming local
 592                  * master browser announcement packet). Expire any of
 593                  * these that are no longer current, and pull the server
 594                  * lists from each of these known local master browsers.
 595                  * (nmbd_browsesync.c)
 596                  */
 597
 598                 dmb_expire_and_sync_browser_lists(t);
 599
 600                 /*
 601                  * Check that there is a local master browser for our
 602                  * workgroup for all our broadcast subnets. If one
 603                  * is not found, start an election (which we ourselves
 604                  * may or may not participate in, depending on the
 605                  * setting of the 'local master' parameter.
 606                  * (nmbd_elections.c)
 607                  */
 608
 609                 check_master_browser_exists(t);
 610
 611                 /*
 612                  * If we are configured as a logon server, attempt to
 613                  * register the special NetBIOS names to become such
 614                  * (WORKGROUP<1c> name) on all broadcast subnets and
 615                  * with the WINS server (if used). If we are configured
 616                  * to become a domain master browser, attempt to register
 617                  * the special NetBIOS name (WORKGROUP<1b> name) to
 618                  * become such.
 619                  * (nmbd_become_dmb.c)
 620                  */
 621
 622                 add_domain_names(t);
 623
 624                 /*
 625                  * If we are a WINS server, do any timer dependent
 626                  * processing required.
 627                  * (nmbd_winsserver.c)
 628                  */
 629
 630                 initiate_wins_processing(t);
 631
 632                 /*
 633                  * If we are a domain master browser, attempt to contact the
 634                  * WINS server to get a list of all known WORKGROUPS/DOMAINS.
 635                  * This will only work to a Samba WINS server.
 636                  * (nmbd_browsesync.c)
 637                  */
 638
 639                 if (lp_enhanced_browsing())
 640                         collect_all_workgroup_names_from_wins_server(t);
 641
 642                 /*
 643                  * Go through the response record queue and time out or re-transmit
 644                  * and expired entries.
 645                  * (nmbd_packets.c)
 646                  */
 647
 648                 retransmit_or_expire_response_records(t);
 649
 650                 /*
 651                  * check to see if any remote browse sync child processes have completed
 652                  */
 653
 654                 sync_check_completion();
 655
 656                 /*
 657                  * regularly sync with any other DMBs we know about
 658                  */
 659
 660                 if (lp_enhanced_browsing())
 661                         sync_all_dmbs(t);
 662
 663                 /*
 664                  * clear the unexpected packet queue
 665                  */
 666
 667                 clear_unexpected(t);
 668
 669                 /* check for new network interfaces */
 670
 671                 reload_interfaces(t);
 672
 673                 /* free up temp memory */
 674                 TALLOC_FREE(frame);
 675         }
 676 }
 677
 678 /**************************************************************************** **
 679  Open the socket communication.
 680  **************************************************************************** */
 681
 682 static bool open_sockets(bool isdaemon, int port)
 683 {
 684         struct sockaddr_storage ss;
 685         const char *sock_addr = lp_socket_address();
 686
 687         /*
 688          * The sockets opened here will be used to receive broadcast
 689          * packets *only*. Interface specific sockets are opened in
 690          * make_subnet() in namedbsubnet.c. Thus we bind to the
 691          * address "0.0.0.0". The parameter 'socket address' is
 692          * now deprecated.
 693          */
 694
 695         if (!interpret_string_addr(&ss, sock_addr,
 696                                 AI_NUMERICHOST|AI_PASSIVE)) {
 697                 DEBUG(0,("open_sockets: unable to get socket address "
 698                         "from string %s", sock_addr));
 699                 return false;
 700         }
 701         if (ss.ss_family != AF_INET) {
 702                 DEBUG(0,("open_sockets: unable to use IPv6 socket"
 703                         "%s in nmbd\n",
 704                         sock_addr));
 705                 return false;
 706         }
 707
 708         if (isdaemon) {
 709                 ClientNMB = open_socket_in(SOCK_DGRAM, port,
 710                                            0, &ss,
 711                                            true);
 712         } else {
 713                 ClientNMB = 0;
 714         }
 715
 716         if (ClientNMB == -1) {
 717                 return false;
 718         }
 719
 720         ClientDGRAM = open_socket_in(SOCK_DGRAM, DGRAM_PORT,
 721                                            3, &ss,
 722                                            true);
 723
 724         if (ClientDGRAM == -1) {
 725                 if (ClientNMB != 0) {
 726                         close(ClientNMB);
 727                 }
 728                 return false;
 729         }
 730
 731         /* we are never interested in SIGPIPE */
 732         BlockSignals(True,SIGPIPE);
 733
 734         set_socket_options( ClientNMB,   "SO_BROADCAST" );
 735         set_socket_options( ClientDGRAM, "SO_BROADCAST" );
 736
 737         /* Ensure we're non-blocking. */
 738         set_blocking( ClientNMB, False);
 739         set_blocking( ClientDGRAM, False);
 740
 741         DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
 742         return( True );
 743 }
 744
 745 /**************************************************************************** **
 746  main program
 747  **************************************************************************** */
 748
 749  int main(int argc, const char *argv[])
 750 {
 751         static bool is_daemon;
 752         static bool opt_interactive;
 753         static bool Fork = true;
 754         static bool no_process_group;
 755         static bool log_stdout;
 756         poptContext pc;
 757         char *p_lmhosts = NULL;
 758         int opt;
 759         enum {
 760                 OPT_DAEMON = 1000,
 761                 OPT_INTERACTIVE,
 762                 OPT_FORK,
 763                 OPT_NO_PROCESS_GROUP,
 764                 OPT_LOG_STDOUT
 765         };
 766         struct poptOption long_options[] = {
 767         POPT_AUTOHELP
 768         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon(default)" },
 769         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)" },
 770         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools & etc)" },
 771         {"no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
 772         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
 773         {"hosts", 'H', POPT_ARG_STRING, &p_lmhosts, 'H', "Load a netbios hosts file"},
 774         {"port", 'p', POPT_ARG_INT, &global_nmb_port, NMB_PORT, "Listen on the specified port" },
 775         POPT_COMMON_SAMBA
 776         { NULL }
 777         };
 778         TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
 779
 780         load_case_tables();
 781
 782         global_nmb_port = NMB_PORT;
 783
 784         pc = poptGetContext("nmbd", argc, argv, long_options, 0);
 785         while ((opt = poptGetNextOpt(pc)) != -1) {
 786                 switch (opt) {
 787                 case OPT_DAEMON:
 788                         is_daemon = true;
 789                         break;
 790                 case OPT_INTERACTIVE:
 791                         opt_interactive = true;
 792                         break;
 793                 case OPT_FORK:
 794                         Fork = false;
 795                         break;
 796                 case OPT_NO_PROCESS_GROUP:
 797                         no_process_group = true;
 798                         break;
 799                 case OPT_LOG_STDOUT:
 800                         log_stdout = true;
 801                         break;
 802                 default:
 803                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
 804                                   poptBadOption(pc, 0), poptStrerror(opt));
 805                         poptPrintUsage(pc, stderr, 0);
 806                         exit(1);
 807                 }
 808         };
 809         poptFreeContext(pc);
 810
 811         global_in_nmbd = true;
 812
 813         StartupTime = time(NULL);
 814
 815         sys_srandom(time(NULL) ^ sys_getpid());
 816
 817         if (!override_logfile) {
 818                 char *lfile = NULL;
 819                 if (asprintf(&lfile, "%s/log.nmbd", get_dyn_LOGFILEBASE()) < 0) {
 820                         exit(1);
 821                 }
 822                 lp_set_logfile(lfile);
 823                 SAFE_FREE(lfile);
 824         }
 825
 826         fault_setup((void (*)(void *))fault_continue );
 827         dump_core_setup("nmbd");
 828
 829         /* POSIX demands that signals are inherited. If the invoking process has
 830          * these signals masked, we will have problems, as we won't receive them. */
 831         BlockSignals(False, SIGHUP);
 832         BlockSignals(False, SIGUSR1);
 833         BlockSignals(False, SIGTERM);
 834
 835 #if defined(SIGFPE)
 836         /* we are never interested in SIGFPE */
 837         BlockSignals(True,SIGFPE);
 838 #endif
 839
 840         /* We no longer use USR2... */
 841 #if defined(SIGUSR2)
 842         BlockSignals(True, SIGUSR2);
 843 #endif
 844
 845         if ( opt_interactive ) {
 846                 Fork = False;
 847                 log_stdout = True;
 848         }
 849
 850         if ( log_stdout && Fork ) {
 851                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
 852                 exit(1);
 853         }
 854
 855         setup_logging( argv[0], log_stdout );
 856
 857         reopen_logs();
 858
 859         DEBUG(0,("nmbd version %s started.\n", samba_version_string()));
 860         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
 861
 862         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
 863                 DEBUG(0, ("error opening config file\n"));
 864                 exit(1);
 865         }
 866
 867         if (nmbd_messaging_context() == NULL) {
 868                 return 1;
 869         }
 870
 871         if ( !reload_nmbd_services(False) )
 872                 return(-1);
 873
 874         if(!init_names())
 875                 return -1;
 876
 877         reload_nmbd_services( True );
 878
 879         if (strequal(lp_workgroup(),"*")) {
 880                 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
 881                 exit(1);
 882         }
 883
 884         set_samba_nb_type();
 885
 886         if (!is_daemon && !is_a_socket(0)) {
 887                 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
 888                 is_daemon = True;
 889         }
 890
 891         if (is_daemon && !opt_interactive) {
 892                 DEBUG( 2, ( "Becoming a daemon.\n" ) );
 893                 become_daemon(Fork, no_process_group, log_stdout);
 894         }
 895
 896 #if HAVE_SETPGID
 897         /*
 898          * If we're interactive we want to set our own process group for
 899          * signal management.
 900          */
 901         if (opt_interactive && !no_process_group)
 902                 setpgid( (pid_t)0, (pid_t)0 );
 903 #endif
 904
 905         if (nmbd_messaging_context() == NULL) {
 906                 return 1;
 907         }
 908
 909 #ifndef SYNC_DNS
 910         /* Setup the async dns. We do it here so it doesn't have all the other
 911                 stuff initialised and thus chewing memory and sockets */
 912         if(lp_we_are_a_wins_server() && lp_dns_proxy()) {
 913                 start_async_dns();
 914         }
 915 #endif
 916
 917         if (!directory_exist(lp_lockdir())) {
 918                 mkdir(lp_lockdir(), 0755);
 919         }
 920
 921         pidfile_create("nmbd");
 922
 923         if (!NT_STATUS_IS_OK(reinit_after_fork(nmbd_messaging_context(),
 924                                                nmbd_event_context(), false))) {
 925                 DEBUG(0,("reinit_after_fork() failed\n"));
 926                 exit(1);
 927         }
 928
 929         if (!nmbd_setup_sig_term_handler())
 930                 exit(1);
 931         if (!nmbd_setup_sig_hup_handler())
 932                 exit(1);
 933
 934         /* get broadcast messages */
 935
 936         if (!serverid_register_self(FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP)) {
 937                 DEBUG(1, ("Could not register myself in serverid.tdb\n"));
 938                 exit(1);
 939         }
 940
 941         messaging_register(nmbd_messaging_context(), NULL,
 942                            MSG_FORCE_ELECTION, nmbd_message_election);
 943 #if 0
 944         /* Until winsrepl is done. */
 945         messaging_register(nmbd_messaging_context(), NULL,
 946                            MSG_WINS_NEW_ENTRY, nmbd_wins_new_entry);
 947 #endif
 948         messaging_register(nmbd_messaging_context(), NULL,
 949                            MSG_SHUTDOWN, nmbd_terminate);
 950         messaging_register(nmbd_messaging_context(), NULL,
 951                            MSG_SMB_CONF_UPDATED, msg_reload_nmbd_services);
 952         messaging_register(nmbd_messaging_context(), NULL,
 953                            MSG_SEND_PACKET, msg_nmbd_send_packet);
 954
 955         TimeInit();
 956
 957         DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port ) );
 958
 959         if ( !open_sockets( is_daemon, global_nmb_port ) ) {
 960                 kill_async_dns_child();
 961                 return 1;
 962         }
 963
 964         /* Determine all the IP addresses we have. */
 965         load_interfaces();
 966
 967         /* Create an nmbd subnet record for each of the above. */
 968         if( False == create_subnets() ) {
 969                 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
 970                 kill_async_dns_child();
 971                 exit(1);
 972         }
 973
 974         /* Load in any static local names. */
 975         if (p_lmhosts) {
 976                 set_dyn_LMHOSTSFILE(p_lmhosts);
 977         }
 978         load_lmhosts_file(get_dyn_LMHOSTSFILE());
 979         DEBUG(3,("Loaded hosts file %s\n", get_dyn_LMHOSTSFILE()));
 980
 981         /* If we are acting as a WINS server, initialise data structures. */
 982         if( !initialise_wins() ) {
 983                 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
 984                 kill_async_dns_child();
 985                 exit(1);
 986         }
 987
 988         /*
 989          * Register nmbd primary workgroup and nmbd names on all
 990          * the broadcast subnets, and on the WINS server (if specified).
 991          * Also initiate the startup of our primary workgroup (start
 992          * elections if we are setup as being able to be a local
 993          * master browser.
 994          */
 995
 996         if( False == register_my_workgroup_and_names() ) {
 997                 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
 998                 kill_async_dns_child();
 999                 exit(1);
1000         }
1001
1002         if (!initialize_nmbd_proxy_logon()) {
1003                 DEBUG(0,("ERROR: Failed setup nmbd_proxy_logon.\n"));
1004                 kill_async_dns_child();
1005                 exit(1);
1006         }
1007
1008         TALLOC_FREE(frame);
1009         process();
1010
1011         if (dbf)
1012                 x_fclose(dbf);
1013         kill_async_dns_child();
1014         return(0);
1015 }