release/src/router/samba/source/nmbd/nmbd.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    NBT netbios routines and daemon - version 2
   5    Copyright (C) Andrew Tridgell 1994-1998
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20
  21    Revision History:
  22
  23    14 jan 96: lkcl@pires.co.uk
  24    added multiple workgroup domain master support
  25
  26 */
  27
  28 #include "includes.h"
  29
  30 extern int DEBUGLEVEL;
  31
  32 extern pstring debugf;
  33 pstring servicesf = CONFIGFILE;
  34
  35 int ClientNMB       = -1;
  36 int ClientDGRAM     = -1;
  37 int global_nmb_port = -1;
  38
  39 static pstring host_file;
  40 extern pstring global_myname;
  41 extern fstring global_myworkgroup;
  42 extern char **my_netbios_names;
  43
  44 extern BOOL global_in_nmbd;
  45
  46 /* are we running as a daemon ? */
  47 static BOOL is_daemon = False;
  48
  49 /* have we found LanMan clients yet? */
  50 BOOL found_lm_clients = False;
  51
  52 /* what server type are we currently */
  53
  54 time_t StartupTime = 0;
  55
  56 extern struct in_addr ipzero;
  57
  58 /**************************************************************************** **
  59   catch a sigterm
  60  **************************************************************************** */
  61 static void sig_term(int sig)
  62 {
  63   BlockSignals(True,SIGTERM);
  64
  65   DEBUG(1,("Got SIGTERM: going down...\n"));
  66
  67   /* Write out wins.dat file if samba is a WINS server */
  68   wins_write_database(False);
  69
  70   /* Remove all SELF registered names. */
  71   release_my_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   exit(0);
  80
  81 } /* sig_term */
  82
  83 /**************************************************************************** **
  84  catch a sighup
  85  **************************************************************************** */
  86 static VOLATILE SIG_ATOMIC_T reload_after_sighup = False;
  87
  88 static void sig_hup(int sig)
  89 {
  90   BlockSignals( True, SIGHUP );
  91
  92   DEBUG( 1, ( "Got SIGHUP dumping debug info.\n" ) );
  93
  94   write_browse_list( 0, True );
  95
  96   dump_all_namelists();
  97
  98   reload_after_sighup = True;
  99
 100   BlockSignals(False,SIGHUP);
 101
 102 } /* sig_hup */
 103
 104
 105 #if DUMP_CORE
 106 /**************************************************************************** **
 107  prepare to dump a core file - carefully!
 108  **************************************************************************** */
 109 static BOOL dump_core(void)
 110 {
 111   char *p;
 112   pstring dname;
 113   pstrcpy( dname, debugf );
 114   if ((p=strrchr(dname,'/')))
 115     *p=0;
 116   pstrcat( dname, "/corefiles" );
 117   mkdir( dname, 0700 );
 118   sys_chown( dname, getuid(), getgid() );
 119   chmod( dname, 0700 );
 120   if ( chdir(dname) )
 121     return( False );
 122   umask( ~(0700) );
 123
 124 #ifdef HAVE_GETRLIMIT
 125 #ifdef RLIMIT_CORE
 126   {
 127     struct rlimit rlp;
 128     getrlimit( RLIMIT_CORE, &rlp );
 129     rlp.rlim_cur = MAX( 4*1024*1024, rlp.rlim_cur );
 130     setrlimit( RLIMIT_CORE, &rlp );
 131     getrlimit( RLIMIT_CORE, &rlp );
 132     DEBUG( 3, ( "Core limits now %d %d\n", (int)rlp.rlim_cur, (int)rlp.rlim_max ) );
 133   }
 134 #endif
 135 #endif
 136
 137
 138   DEBUG(0,("Dumping core in %s\n",dname));
 139   abort();
 140   return( True );
 141 } /* dump_core */
 142 #endif
 143
 144
 145 /**************************************************************************** **
 146  possibly continue after a fault
 147  **************************************************************************** */
 148 static void fault_continue(void)
 149 {
 150 #if DUMP_CORE
 151   dump_core();
 152 #endif
 153 } /* fault_continue */
 154
 155 /**************************************************************************** **
 156  expire old names from the namelist and server list
 157  **************************************************************************** */
 158 static void expire_names_and_servers(time_t t)
 159 {
 160   static time_t lastrun = 0;
 161
 162   if ( !lastrun )
 163     lastrun = t;
 164   if ( t < (lastrun + 5) )
 165     return;
 166   lastrun = t;
 167
 168   /*
 169    * Expire any timed out names on all the broadcast
 170    * subnets and those registered with the WINS server.
 171    * (nmbd_namelistdb.c)
 172    */
 173   expire_names(t);
 174
 175   /*
 176    * Go through all the broadcast subnets and for each
 177    * workgroup known on that subnet remove any expired
 178    * server names. If a workgroup has an empty serverlist
 179    * and has itself timed out then remove the workgroup.
 180    * (nmbd_workgroupdb.c)
 181    */
 182   expire_workgroups_and_servers(t);
 183 } /* expire_names_and_servers */
 184
 185
 186 /************************************************************************** **
 187 reload the list of network interfaces
 188  ************************************************************************** */
 189 static void reload_interfaces(time_t t)
 190 {
 191         static time_t lastt;
 192         int n;
 193         struct subnet_record *subrec;
 194         extern BOOL rescan_listen_set;
 195         extern struct in_addr loopback_ip;
 196
 197         if (t && ((t - lastt) < NMBD_INTERFACES_RELOAD)) return;
 198         lastt = t;
 199
 200         if (!interfaces_changed()) return;
 201
 202         /* the list of probed interfaces has changed, we may need to add/remove
 203            some subnets */
 204         load_interfaces();
 205
 206         /* find any interfaces that need adding */
 207         for (n=iface_count() - 1; n >= 0; n--) {
 208                 struct interface *iface = get_interface(n);
 209
 210                 /*
 211                  * We don't want to add a loopback interface, in case
 212                  * someone has added 127.0.0.1 for smbd, nmbd needs to
 213                  * ignore it here. JRA.
 214                  */
 215
 216                 if (ip_equal(iface->ip, loopback_ip)) {
 217                         DEBUG(2,("reload_interfaces: Ignoring loopback interface %s\n", inet_ntoa(iface->ip)));
 218                         continue;
 219                 }
 220
 221                 for (subrec=subnetlist; subrec; subrec=subrec->next) {
 222                         if (ip_equal(iface->ip, subrec->myip) &&
 223                             ip_equal(iface->nmask, subrec->mask_ip)) break;
 224                 }
 225
 226                 if (!subrec) {
 227                         /* it wasn't found! add it */
 228                         DEBUG(2,("Found new interface %s\n",
 229                                  inet_ntoa(iface->ip)));
 230                         subrec = make_normal_subnet(iface);
 231                         if (subrec) 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                         if (ip_equal(iface->ip, subrec->myip) &&
 240                             ip_equal(iface->nmask, subrec->mask_ip)) break;
 241                 }
 242                 if (n == -1) {
 243                         /* oops, an interface has disapeared. This is
 244                          tricky, we don't dare actually free the
 245                          interface as it could be being used, so
 246                          instead we just wear the memory leak and
 247                          remove it from the list of interfaces without
 248                          freeing it */
 249                         DEBUG(2,("Deleting dead interface %s\n",
 250                                  inet_ntoa(subrec->myip)));
 251                         close_subnet(subrec);
 252                 }
 253         }
 254
 255         rescan_listen_set = True;
 256 }
 257
 258
 259
 260 /**************************************************************************** **
 261   reload the services file
 262  **************************************************************************** */
 263 BOOL reload_services(BOOL test)
 264 {
 265   BOOL ret;
 266   extern fstring remote_machine;
 267
 268   fstrcpy( remote_machine, "nmb" );
 269
 270   if ( lp_loaded() )
 271   {
 272     pstring fname;
 273     pstrcpy( fname,lp_configfile());
 274     if (file_exist(fname,NULL) && !strcsequal(fname,servicesf))
 275     {
 276       pstrcpy(servicesf,fname);
 277       test = False;
 278     }
 279   }
 280
 281   if ( test && !lp_file_list_changed() )
 282     return(True);
 283
 284   ret = lp_load( servicesf, True , False, False);
 285
 286   /* perhaps the config filename is now set */
 287   if ( !test )
 288   {
 289     DEBUG( 3, ( "services not loaded\n" ) );
 290     reload_services( True );
 291   }
 292
 293   /* Do a sanity check for a misconfigured nmbd */
 294   if( lp_wins_support() && *lp_wins_server() )
 295   {
 296     DEBUG(0,("ERROR: both 'wins support = true' and 'wins server = <server>' \
 297 cannot be set in the smb.conf file. nmbd aborting.\n"));
 298     exit(10);
 299   }
 300
 301   return(ret);
 302 } /* reload_services */
 303
 304 /**************************************************************************** **
 305  The main select loop.
 306  **************************************************************************** */
 307 static void process(void)
 308 {
 309   BOOL run_election;
 310
 311   while( True )
 312   {
 313     time_t t = time(NULL);
 314
 315     /*
 316      * Check all broadcast subnets to see if
 317      * we need to run an election on any of them.
 318      * (nmbd_elections.c)
 319      */
 320     run_election = check_elections();
 321
 322     /*
 323      * Read incoming UDP packets.
 324      * (nmbd_packets.c)
 325      */
 326     if(listen_for_packets(run_election))
 327       return;
 328
 329     /*
 330      * Process all incoming packets
 331      * read above. This calls the success and
 332      * failure functions registered when response
 333      * packets arrrive, and also deals with request
 334      * packets from other sources.
 335      * (nmbd_packets.c)
 336      */
 337     run_packet_queue();
 338
 339     /*
 340      * Run any elections - initiate becoming
 341      * a local master browser if we have won.
 342      * (nmbd_elections.c)
 343      */
 344     run_elections(t);
 345
 346     /*
 347      * Send out any broadcast announcements
 348      * of our server names. This also announces
 349      * the workgroup name if we are a local
 350      * master browser.
 351      * (nmbd_sendannounce.c)
 352      */
 353     announce_my_server_names(t);
 354
 355     /*
 356      * Send out any LanMan broadcast announcements
 357      * of our server names.
 358      * (nmbd_sendannounce.c)
 359      */
 360     announce_my_lm_server_names(t);
 361
 362     /*
 363      * If we are a local master browser, periodically
 364      * announce ourselves to the domain master browser.
 365      * This also deals with syncronising the domain master
 366      * browser server lists with ourselves as a local
 367      * master browser.
 368      * (nmbd_sendannounce.c)
 369      */
 370     announce_myself_to_domain_master_browser(t);
 371
 372     /*
 373      * Fullfill any remote announce requests.
 374      * (nmbd_sendannounce.c)
 375      */
 376     announce_remote(t);
 377
 378     /*
 379      * Fullfill any remote browse sync announce requests.
 380      * (nmbd_sendannounce.c)
 381      */
 382     browse_sync_remote(t);
 383
 384     /*
 385      * Scan the broadcast subnets, and WINS client
 386      * namelists and refresh any that need refreshing.
 387      * (nmbd_mynames.c)
 388      */
 389     refresh_my_names(t);
 390
 391     /*
 392      * Scan the subnet namelists and server lists and
 393      * expire thos that have timed out.
 394      * (nmbd.c)
 395      */
 396     expire_names_and_servers(t);
 397
 398     /*
 399      * Write out a snapshot of our current browse list into
 400      * the browse.dat file. This is used by smbd to service
 401      * incoming NetServerEnum calls - used to synchronise
 402      * browse lists over subnets.
 403      * (nmbd_serverlistdb.c)
 404      */
 405     write_browse_list(t, False);
 406
 407     /*
 408      * If we are a domain master browser, we have a list of
 409      * local master browsers we should synchronise browse
 410      * lists with (these are added by an incoming local
 411      * master browser announcement packet). Expire any of
 412      * these that are no longer current, and pull the server
 413      * lists from each of these known local master browsers.
 414      * (nmbd_browsesync.c)
 415      */
 416     dmb_expire_and_sync_browser_lists(t);
 417
 418     /*
 419      * Check that there is a local master browser for our
 420      * workgroup for all our broadcast subnets. If one
 421      * is not found, start an election (which we ourselves
 422      * may or may not participate in, depending on the
 423      * setting of the 'local master' parameter.
 424      * (nmbd_elections.c)
 425      */
 426     check_master_browser_exists(t);
 427
 428     /*
 429      * If we are configured as a logon server, attempt to
 430      * register the special NetBIOS names to become such
 431      * (WORKGROUP<1c> name) on all broadcast subnets and
 432      * with the WINS server (if used). If we are configured
 433      * to become a domain master browser, attempt to register
 434      * the special NetBIOS name (WORKGROUP<1b> name) to
 435      * become such.
 436      * (nmbd_become_dmb.c)
 437      */
 438     add_domain_names(t);
 439
 440     /*
 441      * If we are a WINS server, do any timer dependent
 442      * processing required.
 443      * (nmbd_winsserver.c)
 444      */
 445     initiate_wins_processing(t);
 446
 447     /*
 448      * If we are a domain master browser, attempt to contact the
 449      * WINS server to get a list of all known WORKGROUPS/DOMAINS.
 450      * This will only work to a Samba WINS server.
 451      * (nmbd_browsesync.c)
 452      */
 453     collect_all_workgroup_names_from_wins_server(t);
 454
 455     /*
 456      * Go through the response record queue and time out or re-transmit
 457      * and expired entries.
 458      * (nmbd_packets.c)
 459      */
 460     retransmit_or_expire_response_records(t);
 461
 462     /*
 463      * check to see if any remote browse sync child processes have completed
 464      */
 465     sync_check_completion();
 466
 467     /*
 468      * regularly sync with any other DMBs we know about
 469      */
 470     sync_all_dmbs(t);
 471
 472     /*
 473      * Reload the services file if we got a sighup.
 474      */
 475
 476     if(reload_after_sighup) {
 477             reload_services( True );
 478             reopen_logs();
 479             reload_interfaces(0);
 480             reload_after_sighup = False;
 481     }
 482
 483     /* check for new network interfaces */
 484     reload_interfaces(t);
 485
 486     /* free up temp memory */
 487     lp_talloc_free();
 488   }
 489 } /* process */
 490
 491
 492 /**************************************************************************** **
 493  open the socket communication
 494  **************************************************************************** */
 495 static BOOL open_sockets(BOOL isdaemon, int port)
 496 {
 497   /* The sockets opened here will be used to receive broadcast
 498      packets *only*. Interface specific sockets are opened in
 499      make_subnet() in namedbsubnet.c. Thus we bind to the
 500      address "0.0.0.0". The parameter 'socket address' is
 501      now deprecated.
 502    */
 503
 504   if ( isdaemon )
 505     ClientNMB = open_socket_in(SOCK_DGRAM, port,0,0,True);
 506   else
 507     ClientNMB = 0;
 508
 509   ClientDGRAM = open_socket_in(SOCK_DGRAM,DGRAM_PORT,3,0,True);
 510
 511   if ( ClientNMB == -1 )
 512     return( False );
 513
 514   /* we are never interested in SIGPIPE */
 515   BlockSignals(True,SIGPIPE);
 516
 517   set_socket_options( ClientNMB,   "SO_BROADCAST" );
 518   set_socket_options( ClientDGRAM, "SO_BROADCAST" );
 519
 520   DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
 521   return( True );
 522 } /* open_sockets */
 523
 524
 525 /**************************************************************************** **
 526  initialise connect, service and file structs
 527  **************************************************************************** */
 528 static BOOL init_structs(void)
 529 {
 530   extern fstring local_machine;
 531   char *p, *ptr;
 532   int namecount;
 533   int n;
 534   int nodup;
 535   pstring nbname;
 536
 537   if (! *global_myname)
 538   {
 539     fstrcpy( global_myname, myhostname() );
 540     p = strchr( global_myname, '.' );
 541     if (p)
 542       *p = 0;
 543   }
 544   strupper( global_myname );
 545
 546   /* Add any NETBIOS name aliases. Ensure that the first entry
 547      is equal to global_myname.
 548    */
 549   /* Work out the max number of netbios aliases that we have */
 550   ptr = lp_netbios_aliases();
 551   for( namecount=0; next_token(&ptr,nbname,NULL, sizeof(nbname)); namecount++ )
 552     ;
 553   if ( *global_myname )
 554     namecount++;
 555
 556   /* Allocate space for the netbios aliases */
 557   my_netbios_names = (char **)malloc( sizeof(char *) * (namecount+1) );
 558   if( NULL == my_netbios_names )
 559   {
 560      DEBUG( 0, ( "init_structs: malloc fail.\n" ) );
 561      return( False );
 562   }
 563
 564   /* Use the global_myname string first */
 565   namecount=0;
 566   if ( *global_myname )
 567     my_netbios_names[namecount++] = global_myname;
 568
 569   ptr = lp_netbios_aliases();
 570   while ( next_token( &ptr, nbname, NULL, sizeof(nbname) ) )
 571   {
 572     strupper( nbname );
 573     /* Look for duplicates */
 574     nodup=1;
 575     for( n=0; n<namecount; n++ )
 576     {
 577       if( 0 == strcmp( nbname, my_netbios_names[n] ) )
 578         nodup=0;
 579     }
 580     if (nodup)
 581       my_netbios_names[namecount++] = strdup( nbname );
 582   }
 583
 584   /* Check the strdups succeeded. */
 585   for( n = 0; n < namecount; n++ )
 586     if( NULL == my_netbios_names[n] )
 587     {
 588       DEBUG(0,("init_structs: malloc fail when allocating names.\n"));
 589       return False;
 590     }
 591
 592   /* Terminate name list */
 593   my_netbios_names[namecount++] = NULL;
 594
 595   fstrcpy( local_machine, global_myname );
 596   trim_string( local_machine, " ", " " );
 597   p = strchr( local_machine, ' ' );
 598   if (p)
 599     *p = 0;
 600   strlower( local_machine );
 601
 602   DEBUG( 5, ("Netbios name list:-\n") );
 603   for( n=0; my_netbios_names[n]; n++ )
 604     DEBUGADD( 5, ( "my_netbios_names[%d]=\"%s\"\n", n, my_netbios_names[n] ) );
 605
 606   return( True );
 607 } /* init_structs */
 608
 609 /**************************************************************************** **
 610  usage on the program
 611  **************************************************************************** */
 612 static void usage(char *pname)
 613 {
 614
 615   printf( "Usage: %s [-DaohV] [-H lmhosts file] [-d debuglevel] [-l log basename]\n", pname );
 616   printf( "       [-n name] [-p port] [-s configuration file]\n" );
 617   printf( "\t-D                    Become a daemon\n" );
 618   printf( "\t-a                    Append to log file (default)\n" );
 619   printf( "\t-o                    Overwrite log file, don't append\n" );
 620   printf( "\t-h                    Print usage\n" );
 621   printf( "\t-V                    Print version\n" );
 622   printf( "\t-H hosts file         Load a netbios hosts file\n" );
 623   printf( "\t-d debuglevel         Set the debuglevel\n" );
 624   printf( "\t-l log basename.      Basename for log/debug files\n" );
 625   printf( "\t-n netbiosname.       Primary netbios name\n" );
 626   printf( "\t-p port               Listen on the specified port\n" );
 627   printf( "\t-s configuration file Configuration file name\n" );
 628   printf( "\n");
 629 } /* usage */
 630
 631
 632 /**************************************************************************** **
 633  main program
 634  **************************************************************************** */
 635  int main(int argc,char *argv[])
 636 {
 637   int opt;
 638   extern FILE *dbf;
 639   extern char *optarg;
 640   extern BOOL  append_log;
 641
 642   append_log = True;  /* Default, override with '-o' option. */
 643
 644   global_nmb_port = NMB_PORT;
 645   *host_file = 0;
 646   global_in_nmbd = True;
 647
 648   StartupTime = time(NULL);
 649
 650   sys_srandom(time(NULL) ^ getpid());
 651
 652   TimeInit();
 653
 654   pstrcpy( debugf, NMBLOGFILE );
 655
 656   setup_logging( argv[0], False );
 657
 658   charset_initialise();
 659
 660 #ifdef LMHOSTSFILE
 661   pstrcpy( host_file, LMHOSTSFILE );
 662 #endif
 663
 664   /* this is for people who can't start the program correctly */
 665   while (argc > 1 && (*argv[1] != '-'))
 666   {
 667     argv++;
 668     argc--;
 669   }
 670
 671   fault_setup((void (*)(void *))fault_continue );
 672
 673   CatchSignal( SIGHUP,  SIGNAL_CAST sig_hup );
 674   CatchSignal( SIGTERM, SIGNAL_CAST sig_term );
 675
 676 #if defined(SIGFPE)
 677   /* we are never interested in SIGFPE */
 678   BlockSignals(True,SIGFPE);
 679 #endif
 680
 681   /* Setup the signals that allow the debug log level
 682      to by dynamically changed. */
 683
 684   /* If we are using the malloc debug code we can't use
 685      SIGUSR1 and SIGUSR2 to do debug level changes. */
 686 #ifndef MEM_MAN
 687 #if defined(SIGUSR1)
 688   CatchSignal( SIGUSR1, SIGNAL_CAST sig_usr1 );
 689 #endif /* SIGUSR1 */
 690
 691 #if defined(SIGUSR2)
 692   CatchSignal( SIGUSR2, SIGNAL_CAST sig_usr2 );
 693 #endif /* SIGUSR2 */
 694 #endif /* MEM_MAN */
 695
 696   while( EOF !=
 697          (opt = getopt( argc, argv, "Vaos:T:I:C:bAi:B:N:Rn:l:d:Dp:hSH:G:f:" )) )
 698     {
 699       switch (opt)
 700         {
 701         case 's':
 702           pstrcpy(servicesf,optarg);
 703           break;
 704         case 'N':
 705         case 'B':
 706         case 'I':
 707         case 'C':
 708         case 'G':
 709           DEBUG(0,("Obsolete option '%c' used\n",opt));
 710           break;
 711         case 'H':
 712           pstrcpy(host_file,optarg);
 713           break;
 714         case 'n':
 715           pstrcpy(global_myname,optarg);
 716           strupper(global_myname);
 717           break;
 718         case 'l':
 719           slprintf(debugf,sizeof(debugf)-1, "%s.nmb",optarg);
 720           break;
 721         case 'a':
 722           append_log = True;
 723           break;
 724         case 'o':
 725           append_log = False;
 726           break;
 727         case 'D':
 728           is_daemon = True;
 729           break;
 730         case 'd':
 731           DEBUGLEVEL = atoi(optarg);
 732           break;
 733         case 'p':
 734           global_nmb_port = atoi(optarg);
 735           break;
 736         case 'h':
 737           usage(argv[0]);
 738           exit(0);
 739           break;
 740         case 'V':
 741           printf( "Version %s\n", VERSION );
 742           exit(0);
 743           break;
 744         default:
 745           if( !is_a_socket(0) )
 746           {
 747             DEBUG(0,("Incorrect program usage - is the command line correct?\n"));
 748             usage(argv[0]);
 749             exit(0);
 750           }
 751           break;
 752         }
 753     }
 754
 755   reopen_logs();
 756
 757   DEBUG( 1, ( "Netbios nameserver version %s started.\n", VERSION ) );
 758   DEBUGADD( 1, ( "Copyright Andrew Tridgell 1994-1998\n" ) );
 759
 760   if ( !reload_services(False) )
 761     return(-1);
 762
 763   codepage_initialise(lp_client_code_page());
 764
 765   if(!init_structs())
 766     return -1;
 767
 768   reload_services( True );
 769
 770   fstrcpy( global_myworkgroup, lp_workgroup() );
 771
 772   if (strequal(global_myworkgroup,"*"))
 773   {
 774     DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
 775     exit(1);
 776   }
 777
 778   set_samba_nb_type();
 779
 780   if (!is_daemon && !is_a_socket(0))
 781   {
 782     DEBUG(0,("standard input is not a socket, assuming -D option\n"));
 783     is_daemon = True;
 784   }
 785
 786   if (is_daemon)
 787   {
 788     DEBUG( 2, ( "Becoming a daemon.\n" ) );
 789     become_daemon();
 790   }
 791
 792 #ifndef SYNC_DNS
 793   /* Setup the async dns. We do it here so it doesn't have all the other
 794      stuff initialised and thus chewing memory and sockets */
 795   if(lp_we_are_a_wins_server()) {
 796           start_async_dns();
 797   }
 798 #endif
 799
 800   if (!directory_exist(lp_lockdir(), NULL)) {
 801           mkdir(lp_lockdir(), 0755);
 802   }
 803
 804   pidfile_create("nmbd");
 805
 806   DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port ) );
 807
 808   if ( !open_sockets( is_daemon, global_nmb_port ) )
 809     return 1;
 810
 811   /* Determine all the IP addresses we have. */
 812   load_interfaces();
 813
 814   /* Create an nmbd subnet record for each of the above. */
 815   if( False == create_subnets() )
 816   {
 817     DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
 818     exit(1);
 819   }
 820
 821   /* Load in any static local names. */
 822   if ( *host_file )
 823   {
 824     load_lmhosts_file(host_file);
 825     DEBUG(3,("Loaded hosts file\n"));
 826   }
 827
 828   /* If we are acting as a WINS server, initialise data structures. */
 829   if( !initialise_wins() )
 830   {
 831     DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
 832     exit(1);
 833   }
 834
 835   /*
 836    * Register nmbd primary workgroup and nmbd names on all
 837    * the broadcast subnets, and on the WINS server (if specified).
 838    * Also initiate the startup of our primary workgroup (start
 839    * elections if we are setup as being able to be a local
 840    * master browser.
 841    */
 842
 843   if( False == register_my_workgroup_and_names() )
 844   {
 845     DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
 846     exit(1);
 847   }
 848
 849   /* We can only take signals in the select. */
 850   BlockSignals( True, SIGTERM );
 851 #if defined(SIGUSR1)
 852   BlockSignals( True, SIGUSR1);
 853 #endif /* SIGUSR1 */
 854 #if defined(SIGUSR2)
 855   BlockSignals( True, SIGUSR2);
 856 #endif /* SIGUSR2 */
 857
 858   process();
 859   close_sockets();
 860
 861   if (dbf)
 862     fclose(dbf);
 863   return(0);
 864 } /* main */
 865