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