source3/nmbd/nmbd.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    NBT netbios routines and daemon - version 2
   4    Copyright (C) Andrew Tridgell 1994-1998
   5    Copyright (C) Jeremy Allison 1997-2002
   6    Copyright (C) Jelmer Vernooij 2002,2003 (Conversion to popt)
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20
  21 */
  22
  23 #include "includes.h"
  24
  25 int ClientNMB       = -1;
  26 int ClientDGRAM     = -1;
  27 int global_nmb_port = -1;
  28
  29 extern bool rescan_listen_set;
  30 extern bool global_in_nmbd;
  31
  32 extern bool override_logfile;
  33
  34 /* have we found LanMan clients yet? */
  35 bool found_lm_clients = False;
  36
  37 /* what server type are we currently */
  38
  39 time_t StartupTime = 0;
  40
  41 struct event_context *nmbd_event_context(void)
  42 {
  43         static struct event_context *ctx;
  44
  45         if (!ctx && !(ctx = event_context_init(NULL))) {
  46                 smb_panic("Could not init nmbd event context");
  47         }
  48         return ctx;
  49 }
  50
  51 struct messaging_context *nmbd_messaging_context(void)
  52 {
  53         static struct messaging_context *ctx;
  54
  55         if (ctx == NULL) {
  56                 ctx = messaging_init(NULL, server_id_self(),
  57                                      nmbd_event_context());
  58         }
  59         if (ctx == NULL) {
  60                 DEBUG(0, ("Could not init nmbd messaging context.\n"));
  61         }
  62         return ctx;
  63 }
  64
  65 /**************************************************************************** **
  66  Handle a SIGTERM in band.
  67  **************************************************************************** */
  68
  69 static void terminate(void)
  70 {
  71         DEBUG(0,("Got SIGTERM: going down...\n"));
  72
  73         /* Write out wins.dat file if samba is a WINS server */
  74         wins_write_database(0,False);
  75
  76         /* Remove all SELF registered names from WINS */
  77         release_wins_names();
  78
  79         /* Announce all server entries as 0 time-to-live, 0 type. */
  80         announce_my_servers_removed();
  81
  82         /* If there was an async dns child - kill it. */
  83         kill_async_dns_child();
  84
  85         gencache_stabilize();
  86
  87         pidfile_unlink();
  88
  89         exit(0);
  90 }
  91
  92 static void nmbd_sig_term_handler(struct tevent_context *ev,
  93                                   struct tevent_signal *se,
  94                                   int signum,
  95                                   int count,
  96                                   void *siginfo,
  97                                   void *private_data)
  98 {
  99         terminate();
 100 }
 101
 102 static bool nmbd_setup_sig_term_handler(void)
 103 {
 104         struct tevent_signal *se;
 105
 106         se = tevent_add_signal(nmbd_event_context(),
 107                                nmbd_event_context(),
 108                                SIGTERM, 0,
 109                                nmbd_sig_term_handler,
 110                                NULL);
 111         if (!se) {
 112                 DEBUG(0,("failed to setup SIGTERM handler"));
 113                 return false;
 114         }
 115
 116         return true;
 117 }
 118
 119 static void msg_reload_nmbd_services(struct messaging_context *msg,
 120                                      void *private_data,
 121                                      uint32_t msg_type,
 122                                      struct server_id server_id,
 123                                      DATA_BLOB *data);
 124
 125 static void nmbd_sig_hup_handler(struct tevent_context *ev,
 126                                  struct tevent_signal *se,
 127                                  int signum,
 128                                  int count,
 129                                  void *siginfo,
 130                                  void *private_data)
 131 {
 132         DEBUG(0,("Got SIGHUP dumping debug info.\n"));
 133         msg_reload_nmbd_services(nmbd_messaging_context(),
 134                                  NULL, MSG_SMB_CONF_UPDATED,
 135                                  procid_self(), NULL);
 136 }
 137
 138 static bool nmbd_setup_sig_hup_handler(void)
 139 {
 140         struct tevent_signal *se;
 141
 142         se = tevent_add_signal(nmbd_event_context(),
 143                                nmbd_event_context(),
 144                                SIGHUP, 0,
 145                                nmbd_sig_hup_handler,
 146                                NULL);
 147         if (!se) {
 148                 DEBUG(0,("failed to setup SIGHUP handler"));
 149                 return false;
 150         }
 151
 152         return true;
 153 }
 154
 155 /**************************************************************************** **
 156  Handle a SHUTDOWN message from smbcontrol.
 157  **************************************************************************** */
 158
 159 static void nmbd_terminate(struct messaging_context *msg,
 160                            void *private_data,
 161                            uint32_t msg_type,
 162                            struct server_id server_id,
 163                            DATA_BLOB *data)
 164 {
 165         terminate();
 166 }
 167
 168 /**************************************************************************** **
 169  Possibly continue after a fault.
 170  **************************************************************************** */
 171
 172 static void fault_continue(void)
 173 {
 174         dump_core();
 175 }
 176
 177 /**************************************************************************** **
 178  Expire old names from the namelist and server list.
 179  **************************************************************************** */
 180
 181 static void expire_names_and_servers(time_t t)
 182 {
 183         static time_t lastrun = 0;
 184
 185         if ( !lastrun )
 186                 lastrun = t;
 187         if ( t < (lastrun + 5) )
 188                 return;
 189         lastrun = t;
 190
 191         /*
 192          * Expire any timed out names on all the broadcast
 193          * subnets and those registered with the WINS server.
 194          * (nmbd_namelistdb.c)
 195          */
 196
 197         expire_names(t);
 198
 199         /*
 200          * Go through all the broadcast subnets and for each
 201          * workgroup known on that subnet remove any expired
 202          * server names. If a workgroup has an empty serverlist
 203          * and has itself timed out then remove the workgroup.
 204          * (nmbd_workgroupdb.c)
 205          */
 206
 207         expire_workgroups_and_servers(t);
 208 }
 209
 210 /************************************************************************** **
 211  Reload the list of network interfaces.
 212  Doesn't return until a network interface is up.
 213  ************************************************************************** */
 214
 215 static void reload_interfaces(time_t t)
 216 {
 217         static time_t lastt;
 218         int n;
 219         bool print_waiting_msg = true;
 220         struct subnet_record *subrec;
 221
 222         if (t && ((t - lastt) < NMBD_INTERFACES_RELOAD)) {
 223                 return;
 224         }
 225
 226         lastt = t;
 227
 228         if (!interfaces_changed()) {
 229                 return;
 230         }
 231
 232   try_again:
 233
 234         /* the list of probed interfaces has changed, we may need to add/remove
 235            some subnets */
 236         load_interfaces();
 237
 238         /* find any interfaces that need adding */
 239         for (n=iface_count() - 1; n >= 0; n--) {
 240                 char str[INET6_ADDRSTRLEN];
 241                 const struct interface *iface = get_interface(n);
 242                 struct in_addr ip, nmask;
 243
 244                 if (!iface) {
 245                         DEBUG(2,("reload_interfaces: failed to get interface %d\n", n));
 246                         continue;
 247                 }
 248
 249                 /* Ensure we're only dealing with IPv4 here. */
 250                 if (iface->ip.ss_family != AF_INET) {
 251                         DEBUG(2,("reload_interfaces: "
 252                                 "ignoring non IPv4 interface.\n"));
 253                         continue;
 254                 }
 255
 256                 ip = ((struct sockaddr_in *)&iface->ip)->sin_addr;
 257                 nmask = ((struct sockaddr_in *)&iface->netmask)->sin_addr;
 258
 259                 /*
 260                  * We don't want to add a loopback interface, in case
 261                  * someone has added 127.0.0.1 for smbd, nmbd needs to
 262                  * ignore it here. JRA.
 263                  */
 264
 265                 if (is_loopback_addr((struct sockaddr *)&iface->ip)) {
 266                         DEBUG(2,("reload_interfaces: Ignoring loopback "
 267                                 "interface %s\n",
 268                                 print_sockaddr(str, sizeof(str), &iface->ip) ));
 269                         continue;
 270                 }
 271
 272                 for (subrec=subnetlist; subrec; subrec=subrec->next) {
 273                         if (ip_equal_v4(ip, subrec->myip) &&
 274                             ip_equal_v4(nmask, subrec->mask_ip)) {
 275                                 break;
 276                         }
 277                 }
 278
 279                 if (!subrec) {
 280                         /* it wasn't found! add it */
 281                         DEBUG(2,("Found new interface %s\n",
 282                                  print_sockaddr(str,
 283                                          sizeof(str), &iface->ip) ));
 284                         subrec = make_normal_subnet(iface);
 285                         if (subrec)
 286                                 register_my_workgroup_one_subnet(subrec);
 287                 }
 288         }
 289
 290         /* find any interfaces that need deleting */
 291         for (subrec=subnetlist; subrec; subrec=subrec->next) {
 292                 for (n=iface_count() - 1; n >= 0; n--) {
 293                         struct interface *iface = get_interface(n);
 294                         struct in_addr ip, nmask;
 295                         if (!iface) {
 296                                 continue;
 297                         }
 298                         /* Ensure we're only dealing with IPv4 here. */
 299                         if (iface->ip.ss_family != AF_INET) {
 300                                 DEBUG(2,("reload_interfaces: "
 301                                         "ignoring non IPv4 interface.\n"));
 302                                 continue;
 303                         }
 304                         ip = ((struct sockaddr_in *)&iface->ip)->sin_addr;
 305                         nmask = ((struct sockaddr_in *)&iface->netmask)->sin_addr;
 306                         if (ip_equal_v4(ip, subrec->myip) &&
 307                             ip_equal_v4(nmask, subrec->mask_ip)) {
 308                                 break;
 309                         }
 310                 }
 311                 if (n == -1) {
 312                         /* oops, an interface has disapeared. This is
 313                          tricky, we don't dare actually free the
 314                          interface as it could be being used, so
 315                          instead we just wear the memory leak and
 316                          remove it from the list of interfaces without
 317                          freeing it */
 318                         DEBUG(2,("Deleting dead interface %s\n",
 319                                  inet_ntoa(subrec->myip)));
 320                         close_subnet(subrec);
 321                 }
 322         }
 323
 324         rescan_listen_set = True;
 325
 326         /* We need to wait if there are no subnets... */
 327         if (FIRST_SUBNET == NULL) {
 328                 void (*saved_handler)(int);
 329
 330                 if (print_waiting_msg) {
 331                         DEBUG(0,("reload_interfaces: "
 332                                 "No subnets to listen to. Waiting..\n"));
 333                         print_waiting_msg = false;
 334                 }
 335
 336                 /*
 337                  * Whilst we're waiting for an interface, allow SIGTERM to
 338                  * cause us to exit.
 339                  */
 340                 saved_handler = CatchSignal( SIGTERM, SIGNAL_CAST SIG_DFL );
 341
 342                 /* We only count IPv4, non-loopback interfaces here. */
 343                 while (iface_count_v4_nl() == 0) {
 344                         sleep(5);
 345                         load_interfaces();
 346                 }
 347
 348                 CatchSignal( SIGTERM, SIGNAL_CAST saved_handler );
 349
 350                 /*
 351                  * We got an interface, go back to blocking term.
 352                  */
 353
 354                 goto try_again;
 355         }
 356 }
 357
 358 /**************************************************************************** **
 359  Reload the services file.
 360  **************************************************************************** */
 361
 362 static bool reload_nmbd_services(bool test)
 363 {
 364         bool ret;
 365
 366         set_remote_machine_name("nmbd", False);
 367
 368         if ( lp_loaded() ) {
 369                 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->fd = (p->packet_type == NMB_PACKET) ?
 447                 subrec->nmb_sock : subrec->dgram_sock;
 448
 449         for (subrec = FIRST_SUBNET; subrec != NULL;
 450              subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
 451                 if (ip_equal_v4(*local_ip, subrec->myip)) {
 452                         p->fd = (p->packet_type == NMB_PACKET) ?
 453                                 subrec->nmb_sock : subrec->dgram_sock;
 454                         break;
 455                 }
 456         }
 457
 458         if (p->packet_type == DGRAM_PACKET) {
 459                 p->port = 138;
 460                 p->packet.dgram.header.source_ip.s_addr = local_ip->s_addr;
 461                 p->packet.dgram.header.source_port = 138;
 462         }
 463
 464         send_packet(p);
 465 }
 466
 467 /**************************************************************************** **
 468  The main select loop.
 469  **************************************************************************** */
 470
 471 static void process(void)
 472 {
 473         bool run_election;
 474
 475         while( True ) {
 476                 time_t t = time(NULL);
 477                 TALLOC_CTX *frame = talloc_stackframe();
 478
 479                 /*
 480                  * Check all broadcast subnets to see if
 481                  * we need to run an election on any of them.
 482                  * (nmbd_elections.c)
 483                  */
 484
 485                 run_election = check_elections();
 486
 487                 /*
 488                  * Read incoming UDP packets.
 489                  * (nmbd_packets.c)
 490                  */
 491
 492                 if(listen_for_packets(run_election)) {
 493                         TALLOC_FREE(frame);
 494                         return;
 495                 }
 496
 497                 /*
 498                  * Process all incoming packets
 499                  * read above. This calls the success and
 500                  * failure functions registered when response
 501                  * packets arrrive, and also deals with request
 502                  * packets from other sources.
 503                  * (nmbd_packets.c)
 504                  */
 505
 506                 run_packet_queue();
 507
 508                 /*
 509                  * Run any elections - initiate becoming
 510                  * a local master browser if we have won.
 511                  * (nmbd_elections.c)
 512                  */
 513
 514                 run_elections(t);
 515
 516                 /*
 517                  * Send out any broadcast announcements
 518                  * of our server names. This also announces
 519                  * the workgroup name if we are a local
 520                  * master browser.
 521                  * (nmbd_sendannounce.c)
 522                  */
 523
 524                 announce_my_server_names(t);
 525
 526                 /*
 527                  * Send out any LanMan broadcast announcements
 528                  * of our server names.
 529                  * (nmbd_sendannounce.c)
 530                  */
 531
 532                 announce_my_lm_server_names(t);
 533
 534                 /*
 535                  * If we are a local master browser, periodically
 536                  * announce ourselves to the domain master browser.
 537                  * This also deals with syncronising the domain master
 538                  * browser server lists with ourselves as a local
 539                  * master browser.
 540                  * (nmbd_sendannounce.c)
 541                  */
 542
 543                 announce_myself_to_domain_master_browser(t);
 544
 545                 /*
 546                  * Fullfill any remote announce requests.
 547                  * (nmbd_sendannounce.c)
 548                  */
 549
 550                 announce_remote(t);
 551
 552                 /*
 553                  * Fullfill any remote browse sync announce requests.
 554                  * (nmbd_sendannounce.c)
 555                  */
 556
 557                 browse_sync_remote(t);
 558
 559                 /*
 560                  * Scan the broadcast subnets, and WINS client
 561                  * namelists and refresh any that need refreshing.
 562                  * (nmbd_mynames.c)
 563                  */
 564
 565                 refresh_my_names(t);
 566
 567                 /*
 568                  * Scan the subnet namelists and server lists and
 569                  * expire thos that have timed out.
 570                  * (nmbd.c)
 571                  */
 572
 573                 expire_names_and_servers(t);
 574
 575                 /*
 576                  * Write out a snapshot of our current browse list into
 577                  * the browse.dat file. This is used by smbd to service
 578                  * incoming NetServerEnum calls - used to synchronise
 579                  * browse lists over subnets.
 580                  * (nmbd_serverlistdb.c)
 581                  */
 582
 583                 write_browse_list(t, False);
 584
 585                 /*
 586                  * If we are a domain master browser, we have a list of
 587                  * local master browsers we should synchronise browse
 588                  * lists with (these are added by an incoming local
 589                  * master browser announcement packet). Expire any of
 590                  * these that are no longer current, and pull the server
 591                  * lists from each of these known local master browsers.
 592                  * (nmbd_browsesync.c)
 593                  */
 594
 595                 dmb_expire_and_sync_browser_lists(t);
 596
 597                 /*
 598                  * Check that there is a local master browser for our
 599                  * workgroup for all our broadcast subnets. If one
 600                  * is not found, start an election (which we ourselves
 601                  * may or may not participate in, depending on the
 602                  * setting of the 'local master' parameter.
 603                  * (nmbd_elections.c)
 604                  */
 605
 606                 check_master_browser_exists(t);
 607
 608                 /*
 609                  * If we are configured as a logon server, attempt to
 610                  * register the special NetBIOS names to become such
 611                  * (WORKGROUP<1c> name) on all broadcast subnets and
 612                  * with the WINS server (if used). If we are configured
 613                  * to become a domain master browser, attempt to register
 614                  * the special NetBIOS name (WORKGROUP<1b> name) to
 615                  * become such.
 616                  * (nmbd_become_dmb.c)
 617                  */
 618
 619                 add_domain_names(t);
 620
 621                 /*
 622                  * If we are a WINS server, do any timer dependent
 623                  * processing required.
 624                  * (nmbd_winsserver.c)
 625                  */
 626
 627                 initiate_wins_processing(t);
 628
 629                 /*
 630                  * If we are a domain master browser, attempt to contact the
 631                  * WINS server to get a list of all known WORKGROUPS/DOMAINS.
 632                  * This will only work to a Samba WINS server.
 633                  * (nmbd_browsesync.c)
 634                  */
 635
 636                 if (lp_enhanced_browsing())
 637                         collect_all_workgroup_names_from_wins_server(t);
 638
 639                 /*
 640                  * Go through the response record queue and time out or re-transmit
 641                  * and expired entries.
 642                  * (nmbd_packets.c)
 643                  */
 644
 645                 retransmit_or_expire_response_records(t);
 646
 647                 /*
 648                  * check to see if any remote browse sync child processes have completed
 649                  */
 650
 651                 sync_check_completion();
 652
 653                 /*
 654                  * regularly sync with any other DMBs we know about
 655                  */
 656
 657                 if (lp_enhanced_browsing())
 658                         sync_all_dmbs(t);
 659
 660                 /*
 661                  * clear the unexpected packet queue
 662                  */
 663
 664                 clear_unexpected(t);
 665
 666                 /* check for new network interfaces */
 667
 668                 reload_interfaces(t);
 669
 670                 /* free up temp memory */
 671                 TALLOC_FREE(frame);
 672         }
 673 }
 674
 675 /**************************************************************************** **
 676  Open the socket communication.
 677  **************************************************************************** */
 678
 679 static bool open_sockets(bool isdaemon, int port)
 680 {
 681         struct sockaddr_storage ss;
 682         const char *sock_addr = lp_socket_address();
 683
 684         /*
 685          * The sockets opened here will be used to receive broadcast
 686          * packets *only*. Interface specific sockets are opened in
 687          * make_subnet() in namedbsubnet.c. Thus we bind to the
 688          * address "0.0.0.0". The parameter 'socket address' is
 689          * now deprecated.
 690          */
 691
 692         if (!interpret_string_addr(&ss, sock_addr,
 693                                 AI_NUMERICHOST|AI_PASSIVE)) {
 694                 DEBUG(0,("open_sockets: unable to get socket address "
 695                         "from string %s", sock_addr));
 696                 return false;
 697         }
 698         if (ss.ss_family != AF_INET) {
 699                 DEBUG(0,("open_sockets: unable to use IPv6 socket"
 700                         "%s in nmbd\n",
 701                         sock_addr));
 702                 return false;
 703         }
 704
 705         if (isdaemon) {
 706                 ClientNMB = open_socket_in(SOCK_DGRAM, port,
 707                                            0, &ss,
 708                                            true);
 709         } else {
 710                 ClientNMB = 0;
 711         }
 712
 713         if (ClientNMB == -1) {
 714                 return false;
 715         }
 716
 717         ClientDGRAM = open_socket_in(SOCK_DGRAM, DGRAM_PORT,
 718                                            3, &ss,
 719                                            true);
 720
 721         if (ClientDGRAM == -1) {
 722                 if (ClientNMB != 0) {
 723                         close(ClientNMB);
 724                 }
 725                 return false;
 726         }
 727
 728         /* we are never interested in SIGPIPE */
 729         BlockSignals(True,SIGPIPE);
 730
 731         set_socket_options( ClientNMB,   "SO_BROADCAST" );
 732         set_socket_options( ClientDGRAM, "SO_BROADCAST" );
 733
 734         /* Ensure we're non-blocking. */
 735         set_blocking( ClientNMB, False);
 736         set_blocking( ClientDGRAM, False);
 737
 738         DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
 739         return( True );
 740 }
 741
 742 /**************************************************************************** **
 743  main program
 744  **************************************************************************** */
 745
 746  int main(int argc, const char *argv[])
 747 {
 748         static bool is_daemon;
 749         static bool opt_interactive;
 750         static bool Fork = true;
 751         static bool no_process_group;
 752         static bool log_stdout;
 753         poptContext pc;
 754         char *p_lmhosts = NULL;
 755         int opt;
 756         enum {
 757                 OPT_DAEMON = 1000,
 758                 OPT_INTERACTIVE,
 759                 OPT_FORK,
 760                 OPT_NO_PROCESS_GROUP,
 761                 OPT_LOG_STDOUT
 762         };
 763         struct poptOption long_options[] = {
 764         POPT_AUTOHELP
 765         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon(default)" },
 766         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)" },
 767         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools & etc)" },
 768         {"no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
 769         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
 770         {"hosts", 'H', POPT_ARG_STRING, &p_lmhosts, 'H', "Load a netbios hosts file"},
 771         {"port", 'p', POPT_ARG_INT, &global_nmb_port, NMB_PORT, "Listen on the specified port" },
 772         POPT_COMMON_SAMBA
 773         { NULL }
 774         };
 775         TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
 776
 777         load_case_tables();
 778
 779         global_nmb_port = NMB_PORT;
 780
 781         pc = poptGetContext("nmbd", argc, argv, long_options, 0);
 782         while ((opt = poptGetNextOpt(pc)) != -1) {
 783                 switch (opt) {
 784                 case OPT_DAEMON:
 785                         is_daemon = true;
 786                         break;
 787                 case OPT_INTERACTIVE:
 788                         opt_interactive = true;
 789                         break;
 790                 case OPT_FORK:
 791                         Fork = false;
 792                         break;
 793                 case OPT_NO_PROCESS_GROUP:
 794                         no_process_group = true;
 795                         break;
 796                 case OPT_LOG_STDOUT:
 797                         log_stdout = true;
 798                         break;
 799                 default:
 800                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
 801                                   poptBadOption(pc, 0), poptStrerror(opt));
 802                         poptPrintUsage(pc, stderr, 0);
 803                         exit(1);
 804                 }
 805         };
 806         poptFreeContext(pc);
 807
 808         global_in_nmbd = true;
 809
 810         StartupTime = time(NULL);
 811
 812         sys_srandom(time(NULL) ^ sys_getpid());
 813
 814         if (!override_logfile) {
 815                 char *lfile = NULL;
 816                 if (asprintf(&lfile, "%s/log.nmbd", get_dyn_LOGFILEBASE()) < 0) {
 817                         exit(1);
 818                 }
 819                 lp_set_logfile(lfile);
 820                 SAFE_FREE(lfile);
 821         }
 822
 823         fault_setup((void (*)(void *))fault_continue );
 824         dump_core_setup("nmbd");
 825
 826         /* POSIX demands that signals are inherited. If the invoking process has
 827          * these signals masked, we will have problems, as we won't receive them. */
 828         BlockSignals(False, SIGHUP);
 829         BlockSignals(False, SIGUSR1);
 830         BlockSignals(False, SIGTERM);
 831
 832 #if defined(SIGFPE)
 833         /* we are never interested in SIGFPE */
 834         BlockSignals(True,SIGFPE);
 835 #endif
 836
 837         /* We no longer use USR2... */
 838 #if defined(SIGUSR2)
 839         BlockSignals(True, SIGUSR2);
 840 #endif
 841
 842         if ( opt_interactive ) {
 843                 Fork = False;
 844                 log_stdout = True;
 845         }
 846
 847         if ( log_stdout && Fork ) {
 848                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
 849                 exit(1);
 850         }
 851
 852         setup_logging( argv[0], log_stdout );
 853
 854         reopen_logs();
 855
 856         DEBUG(0,("nmbd version %s started.\n", samba_version_string()));
 857         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
 858
 859         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
 860                 DEBUG(0, ("error opening config file\n"));
 861                 exit(1);
 862         }
 863
 864         if (nmbd_messaging_context() == NULL) {
 865                 return 1;
 866         }
 867
 868         if ( !reload_nmbd_services(False) )
 869                 return(-1);
 870
 871         if(!init_names())
 872                 return -1;
 873
 874         reload_nmbd_services( True );
 875
 876         if (strequal(lp_workgroup(),"*")) {
 877                 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
 878                 exit(1);
 879         }
 880
 881         set_samba_nb_type();
 882
 883         if (!is_daemon && !is_a_socket(0)) {
 884                 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
 885                 is_daemon = True;
 886         }
 887
 888         if (is_daemon && !opt_interactive) {
 889                 DEBUG( 2, ( "Becoming a daemon.\n" ) );
 890                 become_daemon(Fork, no_process_group);
 891         }
 892
 893 #if HAVE_SETPGID
 894         /*
 895          * If we're interactive we want to set our own process group for
 896          * signal management.
 897          */
 898         if (opt_interactive && !no_process_group)
 899                 setpgid( (pid_t)0, (pid_t)0 );
 900 #endif
 901
 902         if (nmbd_messaging_context() == NULL) {
 903                 return 1;
 904         }
 905
 906 #ifndef SYNC_DNS
 907         /* Setup the async dns. We do it here so it doesn't have all the other
 908                 stuff initialised and thus chewing memory and sockets */
 909         if(lp_we_are_a_wins_server() && lp_dns_proxy()) {
 910                 start_async_dns();
 911         }
 912 #endif
 913
 914         if (!directory_exist(lp_lockdir())) {
 915                 mkdir(lp_lockdir(), 0755);
 916         }
 917
 918         pidfile_create("nmbd");
 919
 920         if (!NT_STATUS_IS_OK(reinit_after_fork(nmbd_messaging_context(),
 921                                                nmbd_event_context(), false))) {
 922                 DEBUG(0,("reinit_after_fork() failed\n"));
 923                 exit(1);
 924         }
 925
 926         if (!nmbd_setup_sig_term_handler())
 927                 exit(1);
 928         if (!nmbd_setup_sig_hup_handler())
 929                 exit(1);
 930
 931         /* get broadcast messages */
 932         claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);
 933
 934         messaging_register(nmbd_messaging_context(), NULL,
 935                            MSG_FORCE_ELECTION, nmbd_message_election);
 936 #if 0
 937         /* Until winsrepl is done. */
 938         messaging_register(nmbd_messaging_context(), NULL,
 939                            MSG_WINS_NEW_ENTRY, nmbd_wins_new_entry);
 940 #endif
 941         messaging_register(nmbd_messaging_context(), NULL,
 942                            MSG_SHUTDOWN, nmbd_terminate);
 943         messaging_register(nmbd_messaging_context(), NULL,
 944                            MSG_SMB_CONF_UPDATED, msg_reload_nmbd_services);
 945         messaging_register(nmbd_messaging_context(), NULL,
 946                            MSG_SEND_PACKET, msg_nmbd_send_packet);
 947
 948         TimeInit();
 949
 950         DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port ) );
 951
 952         if ( !open_sockets( is_daemon, global_nmb_port ) ) {
 953                 kill_async_dns_child();
 954                 return 1;
 955         }
 956
 957         /* Determine all the IP addresses we have. */
 958         load_interfaces();
 959
 960         /* Create an nmbd subnet record for each of the above. */
 961         if( False == create_subnets() ) {
 962                 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
 963                 kill_async_dns_child();
 964                 exit(1);
 965         }
 966
 967         /* Load in any static local names. */
 968         if (p_lmhosts) {
 969                 set_dyn_LMHOSTSFILE(p_lmhosts);
 970         }
 971         load_lmhosts_file(get_dyn_LMHOSTSFILE());
 972         DEBUG(3,("Loaded hosts file %s\n", get_dyn_LMHOSTSFILE()));
 973
 974         /* If we are acting as a WINS server, initialise data structures. */
 975         if( !initialise_wins() ) {
 976                 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
 977                 kill_async_dns_child();
 978                 exit(1);
 979         }
 980
 981         /*
 982          * Register nmbd primary workgroup and nmbd names on all
 983          * the broadcast subnets, and on the WINS server (if specified).
 984          * Also initiate the startup of our primary workgroup (start
 985          * elections if we are setup as being able to be a local
 986          * master browser.
 987          */
 988
 989         if( False == register_my_workgroup_and_names() ) {
 990                 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
 991                 kill_async_dns_child();
 992                 exit(1);
 993         }
 994
 995         if (!initialize_nmbd_proxy_logon()) {
 996                 DEBUG(0,("ERROR: Failed setup nmbd_proxy_logon.\n"));
 997                 kill_async_dns_child();
 998                 exit(1);
 999         }
1000
1001         TALLOC_FREE(frame);
1002         process();
1003
1004         if (dbf)
1005                 x_fclose(dbf);
1006         kill_async_dns_child();
1007         return(0);
1008 }