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, procid_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, 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, 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                 const char *fname = lp_configfile();
 370                 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
 371                         set_dyn_CONFIGFILE(fname);
 372                         test = False;
 373                 }
 374         }
 375
 376         if ( test && !lp_file_list_changed() )
 377                 return(True);
 378
 379         ret = lp_load(get_dyn_CONFIGFILE(), True , False, False, True);
 380
 381         /* perhaps the config filename is now set */
 382         if ( !test ) {
 383                 DEBUG( 3, ( "services not loaded\n" ) );
 384                 reload_nmbd_services( True );
 385         }
 386
 387         return(ret);
 388 }
 389
 390 /**************************************************************************** **
 391  * React on 'smbcontrol nmbd reload-config' in the same way as to SIGHUP
 392  **************************************************************************** */
 393
 394 static void msg_reload_nmbd_services(struct messaging_context *msg,
 395                                      void *private_data,
 396                                      uint32_t msg_type,
 397                                      struct server_id server_id,
 398                                      DATA_BLOB *data)
 399 {
 400         write_browse_list( 0, True );
 401         dump_all_namelists();
 402         reload_nmbd_services( True );
 403         reopen_logs();
 404         reload_interfaces(0);
 405 }
 406
 407 static void msg_nmbd_send_packet(struct messaging_context *msg,
 408                                  void *private_data,
 409                                  uint32_t msg_type,
 410                                  struct server_id src,
 411                                  DATA_BLOB *data)
 412 {
 413         struct packet_struct *p = (struct packet_struct *)data->data;
 414         struct subnet_record *subrec;
 415         struct sockaddr_storage ss;
 416         const struct sockaddr_storage *pss;
 417         const struct in_addr *local_ip;
 418
 419         DEBUG(10, ("Received send_packet from %u\n", (unsigned int)procid_to_pid(&src)));
 420
 421         if (data->length != sizeof(struct packet_struct)) {
 422                 DEBUG(2, ("Discarding invalid packet length from %u\n",
 423                           (unsigned int)procid_to_pid(&src)));
 424                 return;
 425         }
 426
 427         if ((p->packet_type != NMB_PACKET) &&
 428             (p->packet_type != DGRAM_PACKET)) {
 429                 DEBUG(2, ("Discarding invalid packet type from %u: %d\n",
 430                           (unsigned int)procid_to_pid(&src), p->packet_type));
 431                 return;
 432         }
 433
 434         in_addr_to_sockaddr_storage(&ss, p->ip);
 435         pss = iface_ip((struct sockaddr *)&ss);
 436
 437         if (pss == NULL) {
 438                 DEBUG(2, ("Could not find ip for packet from %u\n",
 439                           (unsigned int)procid_to_pid(&src)));
 440                 return;
 441         }
 442
 443         local_ip = &((const struct sockaddr_in *)pss)->sin_addr;
 444         subrec = FIRST_SUBNET;
 445
 446         p->recv_fd = -1;
 447         p->send_fd = (p->packet_type == NMB_PACKET) ?
 448                 subrec->nmb_sock : subrec->dgram_sock;
 449
 450         for (subrec = FIRST_SUBNET; subrec != NULL;
 451              subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
 452                 if (ip_equal_v4(*local_ip, subrec->myip)) {
 453                         p->send_fd = (p->packet_type == NMB_PACKET) ?
 454                                 subrec->nmb_sock : subrec->dgram_sock;
 455                         break;
 456                 }
 457         }
 458
 459         if (p->packet_type == DGRAM_PACKET) {
 460                 p->port = 138;
 461                 p->packet.dgram.header.source_ip.s_addr = local_ip->s_addr;
 462                 p->packet.dgram.header.source_port = 138;
 463         }
 464
 465         send_packet(p);
 466 }
 467
 468 /**************************************************************************** **
 469  The main select loop.
 470  **************************************************************************** */
 471
 472 static void process(void)
 473 {
 474         bool run_election;
 475
 476         while( True ) {
 477                 time_t t = time(NULL);
 478                 TALLOC_CTX *frame = talloc_stackframe();
 479
 480                 /*
 481                  * Check all broadcast subnets to see if
 482                  * we need to run an election on any of them.
 483                  * (nmbd_elections.c)
 484                  */
 485
 486                 run_election = check_elections();
 487
 488                 /*
 489                  * Read incoming UDP packets.
 490                  * (nmbd_packets.c)
 491                  */
 492
 493                 if(listen_for_packets(run_election)) {
 494                         TALLOC_FREE(frame);
 495                         return;
 496                 }
 497
 498                 /*
 499                  * Process all incoming packets
 500                  * read above. This calls the success and
 501                  * failure functions registered when response
 502                  * packets arrrive, and also deals with request
 503                  * packets from other sources.
 504                  * (nmbd_packets.c)
 505                  */
 506
 507                 run_packet_queue();
 508
 509                 /*
 510                  * Run any elections - initiate becoming
 511                  * a local master browser if we have won.
 512                  * (nmbd_elections.c)
 513                  */
 514
 515                 run_elections(t);
 516
 517                 /*
 518                  * Send out any broadcast announcements
 519                  * of our server names. This also announces
 520                  * the workgroup name if we are a local
 521                  * master browser.
 522                  * (nmbd_sendannounce.c)
 523                  */
 524
 525                 announce_my_server_names(t);
 526
 527                 /*
 528                  * Send out any LanMan broadcast announcements
 529                  * of our server names.
 530                  * (nmbd_sendannounce.c)
 531                  */
 532
 533                 announce_my_lm_server_names(t);
 534
 535                 /*
 536                  * If we are a local master browser, periodically
 537                  * announce ourselves to the domain master browser.
 538                  * This also deals with syncronising the domain master
 539                  * browser server lists with ourselves as a local
 540                  * master browser.
 541                  * (nmbd_sendannounce.c)
 542                  */
 543
 544                 announce_myself_to_domain_master_browser(t);
 545
 546                 /*
 547                  * Fullfill any remote announce requests.
 548                  * (nmbd_sendannounce.c)
 549                  */
 550
 551                 announce_remote(t);
 552
 553                 /*
 554                  * Fullfill any remote browse sync announce requests.
 555                  * (nmbd_sendannounce.c)
 556                  */
 557
 558                 browse_sync_remote(t);
 559
 560                 /*
 561                  * Scan the broadcast subnets, and WINS client
 562                  * namelists and refresh any that need refreshing.
 563                  * (nmbd_mynames.c)
 564                  */
 565
 566                 refresh_my_names(t);
 567
 568                 /*
 569                  * Scan the subnet namelists and server lists and
 570                  * expire thos that have timed out.
 571                  * (nmbd.c)
 572                  */
 573
 574                 expire_names_and_servers(t);
 575
 576                 /*
 577                  * Write out a snapshot of our current browse list into
 578                  * the browse.dat file. This is used by smbd to service
 579                  * incoming NetServerEnum calls - used to synchronise
 580                  * browse lists over subnets.
 581                  * (nmbd_serverlistdb.c)
 582                  */
 583
 584                 write_browse_list(t, False);
 585
 586                 /*
 587                  * If we are a domain master browser, we have a list of
 588                  * local master browsers we should synchronise browse
 589                  * lists with (these are added by an incoming local
 590                  * master browser announcement packet). Expire any of
 591                  * these that are no longer current, and pull the server
 592                  * lists from each of these known local master browsers.
 593                  * (nmbd_browsesync.c)
 594                  */
 595
 596                 dmb_expire_and_sync_browser_lists(t);
 597
 598                 /*
 599                  * Check that there is a local master browser for our
 600                  * workgroup for all our broadcast subnets. If one
 601                  * is not found, start an election (which we ourselves
 602                  * may or may not participate in, depending on the
 603                  * setting of the 'local master' parameter.
 604                  * (nmbd_elections.c)
 605                  */
 606
 607                 check_master_browser_exists(t);
 608
 609                 /*
 610                  * If we are configured as a logon server, attempt to
 611                  * register the special NetBIOS names to become such
 612                  * (WORKGROUP<1c> name) on all broadcast subnets and
 613                  * with the WINS server (if used). If we are configured
 614                  * to become a domain master browser, attempt to register
 615                  * the special NetBIOS name (WORKGROUP<1b> name) to
 616                  * become such.
 617                  * (nmbd_become_dmb.c)
 618                  */
 619
 620                 add_domain_names(t);
 621
 622                 /*
 623                  * If we are a WINS server, do any timer dependent
 624                  * processing required.
 625                  * (nmbd_winsserver.c)
 626                  */
 627
 628                 initiate_wins_processing(t);
 629
 630                 /*
 631                  * If we are a domain master browser, attempt to contact the
 632                  * WINS server to get a list of all known WORKGROUPS/DOMAINS.
 633                  * This will only work to a Samba WINS server.
 634                  * (nmbd_browsesync.c)
 635                  */
 636
 637                 if (lp_enhanced_browsing())
 638                         collect_all_workgroup_names_from_wins_server(t);
 639
 640                 /*
 641                  * Go through the response record queue and time out or re-transmit
 642                  * and expired entries.
 643                  * (nmbd_packets.c)
 644                  */
 645
 646                 retransmit_or_expire_response_records(t);
 647
 648                 /*
 649                  * check to see if any remote browse sync child processes have completed
 650                  */
 651
 652                 sync_check_completion();
 653
 654                 /*
 655                  * regularly sync with any other DMBs we know about
 656                  */
 657
 658                 if (lp_enhanced_browsing())
 659                         sync_all_dmbs(t);
 660
 661                 /*
 662                  * clear the unexpected packet queue
 663                  */
 664
 665                 clear_unexpected(t);
 666
 667                 /* check for new network interfaces */
 668
 669                 reload_interfaces(t);
 670
 671                 /* free up temp memory */
 672                 TALLOC_FREE(frame);
 673         }
 674 }
 675
 676 /**************************************************************************** **
 677  Open the socket communication.
 678  **************************************************************************** */
 679
 680 static bool open_sockets(bool isdaemon, int port)
 681 {
 682         struct sockaddr_storage ss;
 683         const char *sock_addr = lp_socket_address();
 684
 685         /*
 686          * The sockets opened here will be used to receive broadcast
 687          * packets *only*. Interface specific sockets are opened in
 688          * make_subnet() in namedbsubnet.c. Thus we bind to the
 689          * address "0.0.0.0". The parameter 'socket address' is
 690          * now deprecated.
 691          */
 692
 693         if (!interpret_string_addr(&ss, sock_addr,
 694                                 AI_NUMERICHOST|AI_PASSIVE)) {
 695                 DEBUG(0,("open_sockets: unable to get socket address "
 696                         "from string %s", sock_addr));
 697                 return false;
 698         }
 699         if (ss.ss_family != AF_INET) {
 700                 DEBUG(0,("open_sockets: unable to use IPv6 socket"
 701                         "%s in nmbd\n",
 702                         sock_addr));
 703                 return false;
 704         }
 705
 706         if (isdaemon) {
 707                 ClientNMB = open_socket_in(SOCK_DGRAM, port,
 708                                            0, &ss,
 709                                            true);
 710         } else {
 711                 ClientNMB = 0;
 712         }
 713
 714         if (ClientNMB == -1) {
 715                 return false;
 716         }
 717
 718         ClientDGRAM = open_socket_in(SOCK_DGRAM, DGRAM_PORT,
 719                                            3, &ss,
 720                                            true);
 721
 722         if (ClientDGRAM == -1) {
 723                 if (ClientNMB != 0) {
 724                         close(ClientNMB);
 725                 }
 726                 return false;
 727         }
 728
 729         /* we are never interested in SIGPIPE */
 730         BlockSignals(True,SIGPIPE);
 731
 732         set_socket_options( ClientNMB,   "SO_BROADCAST" );
 733         set_socket_options( ClientDGRAM, "SO_BROADCAST" );
 734
 735         /* Ensure we're non-blocking. */
 736         set_blocking( ClientNMB, False);
 737         set_blocking( ClientDGRAM, False);
 738
 739         DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
 740         return( True );
 741 }
 742
 743 /**************************************************************************** **
 744  main program
 745  **************************************************************************** */
 746
 747  int main(int argc, const char *argv[])
 748 {
 749         static bool is_daemon;
 750         static bool opt_interactive;
 751         static bool Fork = true;
 752         static bool no_process_group;
 753         static bool log_stdout;
 754         poptContext pc;
 755         char *p_lmhosts = NULL;
 756         int opt;
 757         enum {
 758                 OPT_DAEMON = 1000,
 759                 OPT_INTERACTIVE,
 760                 OPT_FORK,
 761                 OPT_NO_PROCESS_GROUP,
 762                 OPT_LOG_STDOUT
 763         };
 764         struct poptOption long_options[] = {
 765         POPT_AUTOHELP
 766         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon(default)" },
 767         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)" },
 768         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools & etc)" },
 769         {"no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
 770         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
 771         {"hosts", 'H', POPT_ARG_STRING, &p_lmhosts, 'H', "Load a netbios hosts file"},
 772         {"port", 'p', POPT_ARG_INT, &global_nmb_port, NMB_PORT, "Listen on the specified port" },
 773         POPT_COMMON_SAMBA
 774         { NULL }
 775         };
 776         TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
 777
 778         load_case_tables();
 779
 780         global_nmb_port = NMB_PORT;
 781
 782         pc = poptGetContext("nmbd", argc, argv, long_options, 0);
 783         while ((opt = poptGetNextOpt(pc)) != -1) {
 784                 switch (opt) {
 785                 case OPT_DAEMON:
 786                         is_daemon = true;
 787                         break;
 788                 case OPT_INTERACTIVE:
 789                         opt_interactive = true;
 790                         break;
 791                 case OPT_FORK:
 792                         Fork = false;
 793                         break;
 794                 case OPT_NO_PROCESS_GROUP:
 795                         no_process_group = true;
 796                         break;
 797                 case OPT_LOG_STDOUT:
 798                         log_stdout = true;
 799                         break;
 800                 default:
 801                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
 802                                   poptBadOption(pc, 0), poptStrerror(opt));
 803                         poptPrintUsage(pc, stderr, 0);
 804                         exit(1);
 805                 }
 806         };
 807         poptFreeContext(pc);
 808
 809         global_in_nmbd = true;
 810
 811         StartupTime = time(NULL);
 812
 813         sys_srandom(time(NULL) ^ sys_getpid());
 814
 815         if (!override_logfile) {
 816                 char *lfile = NULL;
 817                 if (asprintf(&lfile, "%s/log.nmbd", get_dyn_LOGFILEBASE()) < 0) {
 818                         exit(1);
 819                 }
 820                 lp_set_logfile(lfile);
 821                 SAFE_FREE(lfile);
 822         }
 823
 824         fault_setup((void (*)(void *))fault_continue );
 825         dump_core_setup("nmbd");
 826
 827         /* POSIX demands that signals are inherited. If the invoking process has
 828          * these signals masked, we will have problems, as we won't receive them. */
 829         BlockSignals(False, SIGHUP);
 830         BlockSignals(False, SIGUSR1);
 831         BlockSignals(False, SIGTERM);
 832
 833 #if defined(SIGFPE)
 834         /* we are never interested in SIGFPE */
 835         BlockSignals(True,SIGFPE);
 836 #endif
 837
 838         /* We no longer use USR2... */
 839 #if defined(SIGUSR2)
 840         BlockSignals(True, SIGUSR2);
 841 #endif
 842
 843         if ( opt_interactive ) {
 844                 Fork = False;
 845                 log_stdout = True;
 846         }
 847
 848         if ( log_stdout && Fork ) {
 849                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
 850                 exit(1);
 851         }
 852
 853         setup_logging( argv[0], log_stdout );
 854
 855         reopen_logs();
 856
 857         DEBUG(0,("nmbd version %s started.\n", samba_version_string()));
 858         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
 859
 860         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
 861                 DEBUG(0, ("error opening config file\n"));
 862                 exit(1);
 863         }
 864
 865         if (nmbd_messaging_context() == NULL) {
 866                 return 1;
 867         }
 868
 869         if ( !reload_nmbd_services(False) )
 870                 return(-1);
 871
 872         if(!init_names())
 873                 return -1;
 874
 875         reload_nmbd_services( True );
 876
 877         if (strequal(lp_workgroup(),"*")) {
 878                 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
 879                 exit(1);
 880         }
 881
 882         set_samba_nb_type();
 883
 884         if (!is_daemon && !is_a_socket(0)) {
 885                 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
 886                 is_daemon = True;
 887         }
 888
 889         if (is_daemon && !opt_interactive) {
 890                 DEBUG( 2, ( "Becoming a daemon.\n" ) );
 891                 become_daemon(Fork, no_process_group);
 892         }
 893
 894 #if HAVE_SETPGID
 895         /*
 896          * If we're interactive we want to set our own process group for
 897          * signal management.
 898          */
 899         if (opt_interactive && !no_process_group)
 900                 setpgid( (pid_t)0, (pid_t)0 );
 901 #endif
 902
 903         if (nmbd_messaging_context() == NULL) {
 904                 return 1;
 905         }
 906
 907 #ifndef SYNC_DNS
 908         /* Setup the async dns. We do it here so it doesn't have all the other
 909                 stuff initialised and thus chewing memory and sockets */
 910         if(lp_we_are_a_wins_server() && lp_dns_proxy()) {
 911                 start_async_dns();
 912         }
 913 #endif
 914
 915         if (!directory_exist(lp_lockdir())) {
 916                 mkdir(lp_lockdir(), 0755);
 917         }
 918
 919         pidfile_create("nmbd");
 920
 921         if (!NT_STATUS_IS_OK(reinit_after_fork(nmbd_messaging_context(),
 922                                                nmbd_event_context(), false))) {
 923                 DEBUG(0,("reinit_after_fork() failed\n"));
 924                 exit(1);
 925         }
 926
 927         if (!nmbd_setup_sig_term_handler())
 928                 exit(1);
 929         if (!nmbd_setup_sig_hup_handler())
 930                 exit(1);
 931
 932         /* get broadcast messages */
 933         claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);
 934
 935         messaging_register(nmbd_messaging_context(), NULL,
 936                            MSG_FORCE_ELECTION, nmbd_message_election);
 937 #if 0
 938         /* Until winsrepl is done. */
 939         messaging_register(nmbd_messaging_context(), NULL,
 940                            MSG_WINS_NEW_ENTRY, nmbd_wins_new_entry);
 941 #endif
 942         messaging_register(nmbd_messaging_context(), NULL,
 943                            MSG_SHUTDOWN, nmbd_terminate);
 944         messaging_register(nmbd_messaging_context(), NULL,
 945                            MSG_SMB_CONF_UPDATED, msg_reload_nmbd_services);
 946         messaging_register(nmbd_messaging_context(), NULL,
 947                            MSG_SEND_PACKET, msg_nmbd_send_packet);
 948
 949         TimeInit();
 950
 951         DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port ) );
 952
 953         if ( !open_sockets( is_daemon, global_nmb_port ) ) {
 954                 kill_async_dns_child();
 955                 return 1;
 956         }
 957
 958         /* Determine all the IP addresses we have. */
 959         load_interfaces();
 960
 961         /* Create an nmbd subnet record for each of the above. */
 962         if( False == create_subnets() ) {
 963                 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
 964                 kill_async_dns_child();
 965                 exit(1);
 966         }
 967
 968         /* Load in any static local names. */
 969         if (p_lmhosts) {
 970                 set_dyn_LMHOSTSFILE(p_lmhosts);
 971         }
 972         load_lmhosts_file(get_dyn_LMHOSTSFILE());
 973         DEBUG(3,("Loaded hosts file %s\n", get_dyn_LMHOSTSFILE()));
 974
 975         /* If we are acting as a WINS server, initialise data structures. */
 976         if( !initialise_wins() ) {
 977                 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
 978                 kill_async_dns_child();
 979                 exit(1);
 980         }
 981
 982         /*
 983          * Register nmbd primary workgroup and nmbd names on all
 984          * the broadcast subnets, and on the WINS server (if specified).
 985          * Also initiate the startup of our primary workgroup (start
 986          * elections if we are setup as being able to be a local
 987          * master browser.
 988          */
 989
 990         if( False == register_my_workgroup_and_names() ) {
 991                 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
 992                 kill_async_dns_child();
 993                 exit(1);
 994         }
 995
 996         if (!initialize_nmbd_proxy_logon()) {
 997                 DEBUG(0,("ERROR: Failed setup nmbd_proxy_logon.\n"));
 998                 kill_async_dns_child();
 999                 exit(1);
1000         }
1001
1002         TALLOC_FREE(frame);
1003         process();
1004
1005         if (dbf)
1006                 x_fclose(dbf);
1007         kill_async_dns_child();
1008         return(0);
1009 }