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