2 Unix SMB/Netbios implementation.
4 NBT netbios routines and daemon - version 2
5 Copyright (C) Andrew Tridgell 1994-1998
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.
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.
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.
23 14 jan 96: lkcl@pires.co.uk
24 added multiple workgroup domain master support
30 extern int DEBUGLEVEL;
32 extern pstring debugf;
33 pstring servicesf = CONFIGFILE;
37 int global_nmb_port = -1;
39 static pstring host_file;
40 extern pstring global_myname;
41 extern fstring global_myworkgroup;
42 extern char **my_netbios_names;
44 extern BOOL global_in_nmbd;
46 /* are we running as a daemon ? */
47 static BOOL is_daemon = False;
49 /* have we found LanMan clients yet? */
50 BOOL found_lm_clients = False;
52 /* what server type are we currently */
54 time_t StartupTime = 0;
56 extern struct in_addr ipzero;
58 /**************************************************************************** **
60 **************************************************************************** */
61 static void sig_term(int sig)
63 BlockSignals(True,SIGTERM);
65 DEBUG(0,("Got SIGTERM: going down...\n"));
67 /* Write out wins.dat file if samba is a WINS server */
68 wins_write_database(False);
70 /* Remove all SELF registered names. */
73 /* Announce all server entries as 0 time-to-live, 0 type. */
74 announce_my_servers_removed();
76 /* If there was an async dns child - kill it. */
77 kill_async_dns_child();
83 /**************************************************************************** **
85 **************************************************************************** */
86 static VOLATILE sig_atomic_t reload_after_sighup = False;
88 static void sig_hup(int sig)
90 BlockSignals( True, SIGHUP );
92 DEBUG( 0, ( "Got SIGHUP dumping debug info.\n" ) );
94 write_browse_list( 0, True );
98 reload_after_sighup = True;
100 BlockSignals(False,SIGHUP);
106 /**************************************************************************** **
107 prepare to dump a core file - carefully!
108 **************************************************************************** */
109 static BOOL dump_core(void)
113 pstrcpy( dname, debugf );
114 if ((p=strrchr_m(dname,'/')))
116 pstrcat( dname, "/corefiles" );
117 mkdir( dname, 0700 );
118 sys_chown( dname, getuid(), getgid() );
119 chmod( dname, 0700 );
124 #ifdef HAVE_GETRLIMIT
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 ) );
138 DEBUG(0,("Dumping core in %s\n",dname));
145 /**************************************************************************** **
146 possibly continue after a fault
147 **************************************************************************** */
148 static void fault_continue(void)
153 } /* fault_continue */
155 /**************************************************************************** **
156 expire old names from the namelist and server list
157 **************************************************************************** */
158 static void expire_names_and_servers(time_t t)
160 static time_t lastrun = 0;
164 if ( t < (lastrun + 5) )
169 * Expire any timed out names on all the broadcast
170 * subnets and those registered with the WINS server.
171 * (nmbd_namelistdb.c)
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)
182 expire_workgroups_and_servers(t);
183 } /* expire_names_and_servers */
186 /************************************************************************** **
187 reload the list of network interfaces
188 ************************************************************************** */
189 static BOOL reload_interfaces(time_t t)
193 struct subnet_record *subrec;
194 extern BOOL rescan_listen_set;
195 extern struct in_addr loopback_ip;
197 if (t && ((t - lastt) < NMBD_INTERFACES_RELOAD)) return False;
200 if (!interfaces_changed()) return False;
202 /* the list of probed interfaces has changed, we may need to add/remove
206 /* find any interfaces that need adding */
207 for (n=iface_count() - 1; n >= 0; n--) {
208 struct interface *iface = get_interface(n);
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.
216 if (ip_equal(iface->ip, loopback_ip)) {
217 DEBUG(2,("reload_interfaces: Ignoring loopback interface %s\n", inet_ntoa(iface->ip)));
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;
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);
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;
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
249 DEBUG(2,("Deleting dead interface %s\n",
250 inet_ntoa(subrec->myip)));
251 close_subnet(subrec);
255 rescan_listen_set = True;
257 /* We need to shutdown if there are no subnets... */
258 if (FIRST_SUBNET == NULL) {
259 DEBUG(0,("reload_interfaces: No subnets to listen to. Shutting down...\n"));
267 /**************************************************************************** **
268 reload the services file
269 **************************************************************************** */
270 static BOOL reload_nmbd_services(BOOL test)
273 extern fstring remote_machine;
275 fstrcpy( remote_machine, "nmbd" );
280 pstrcpy( fname,lp_configfile());
281 if (file_exist(fname,NULL) && !strcsequal(fname,servicesf))
283 pstrcpy(servicesf,fname);
288 if ( test && !lp_file_list_changed() )
291 ret = lp_load( servicesf, True , False, False);
293 /* perhaps the config filename is now set */
296 DEBUG( 3, ( "services not loaded\n" ) );
297 reload_nmbd_services( True );
300 /* Do a sanity check for a misconfigured nmbd */
301 if( lp_wins_support() && wins_srv_count() )
305 dbgtext( "ERROR: 'wins support = true' and 'wins server = <server>'\n" );
306 dbgtext( "are conflicting settings. nmbd aborting.\n" );
312 } /* reload_nmbd_services */
314 /**************************************************************************** **
315 The main select loop.
316 **************************************************************************** */
317 static void process(void)
323 time_t t = time(NULL);
325 /* check for internal messages */
329 * Check all broadcast subnets to see if
330 * we need to run an election on any of them.
333 run_election = check_elections();
336 * Read incoming UDP packets.
339 if(listen_for_packets(run_election))
343 * Process all incoming packets
344 * read above. This calls the success and
345 * failure functions registered when response
346 * packets arrrive, and also deals with request
347 * packets from other sources.
353 * Run any elections - initiate becoming
354 * a local master browser if we have won.
360 * Send out any broadcast announcements
361 * of our server names. This also announces
362 * the workgroup name if we are a local
364 * (nmbd_sendannounce.c)
366 announce_my_server_names(t);
369 * Send out any LanMan broadcast announcements
370 * of our server names.
371 * (nmbd_sendannounce.c)
373 announce_my_lm_server_names(t);
376 * If we are a local master browser, periodically
377 * announce ourselves to the domain master browser.
378 * This also deals with syncronising the domain master
379 * browser server lists with ourselves as a local
381 * (nmbd_sendannounce.c)
383 announce_myself_to_domain_master_browser(t);
386 * Fullfill any remote announce requests.
387 * (nmbd_sendannounce.c)
392 * Fullfill any remote browse sync announce requests.
393 * (nmbd_sendannounce.c)
395 browse_sync_remote(t);
398 * Scan the broadcast subnets, and WINS client
399 * namelists and refresh any that need refreshing.
405 * Scan the subnet namelists and server lists and
406 * expire thos that have timed out.
409 expire_names_and_servers(t);
412 * Write out a snapshot of our current browse list into
413 * the browse.dat file. This is used by smbd to service
414 * incoming NetServerEnum calls - used to synchronise
415 * browse lists over subnets.
416 * (nmbd_serverlistdb.c)
418 write_browse_list(t, False);
421 * If we are a domain master browser, we have a list of
422 * local master browsers we should synchronise browse
423 * lists with (these are added by an incoming local
424 * master browser announcement packet). Expire any of
425 * these that are no longer current, and pull the server
426 * lists from each of these known local master browsers.
427 * (nmbd_browsesync.c)
429 dmb_expire_and_sync_browser_lists(t);
432 * Check that there is a local master browser for our
433 * workgroup for all our broadcast subnets. If one
434 * is not found, start an election (which we ourselves
435 * may or may not participate in, depending on the
436 * setting of the 'local master' parameter.
439 check_master_browser_exists(t);
442 * If we are configured as a logon server, attempt to
443 * register the special NetBIOS names to become such
444 * (WORKGROUP<1c> name) on all broadcast subnets and
445 * with the WINS server (if used). If we are configured
446 * to become a domain master browser, attempt to register
447 * the special NetBIOS name (WORKGROUP<1b> name) to
449 * (nmbd_become_dmb.c)
454 * If we are a WINS server, do any timer dependent
455 * processing required.
456 * (nmbd_winsserver.c)
458 initiate_wins_processing(t);
461 * If we are a domain master browser, attempt to contact the
462 * WINS server to get a list of all known WORKGROUPS/DOMAINS.
463 * This will only work to a Samba WINS server.
464 * (nmbd_browsesync.c)
466 if (lp_enhanced_browsing()) {
467 collect_all_workgroup_names_from_wins_server(t);
471 * Go through the response record queue and time out or re-transmit
472 * and expired entries.
475 retransmit_or_expire_response_records(t);
478 * check to see if any remote browse sync child processes have completed
480 sync_check_completion();
483 * regularly sync with any other DMBs we know about
485 if (lp_enhanced_browsing()) {
490 * clear the unexpected packet queue
495 * Reload the services file if we got a sighup.
498 if(reload_after_sighup) {
499 reload_nmbd_services( True );
501 if(reload_interfaces(0))
503 reload_after_sighup = False;
506 /* check for new network interfaces */
507 if(reload_interfaces(t))
510 /* free up temp memory */
516 /**************************************************************************** **
517 open the socket communication
518 **************************************************************************** */
519 static BOOL open_sockets(BOOL isdaemon, int port)
521 /* The sockets opened here will be used to receive broadcast
522 packets *only*. Interface specific sockets are opened in
523 make_subnet() in namedbsubnet.c. Thus we bind to the
524 address "0.0.0.0". The parameter 'socket address' is
529 ClientNMB = open_socket_in(SOCK_DGRAM, port,0,0,True);
533 ClientDGRAM = open_socket_in(SOCK_DGRAM,DGRAM_PORT,3,0,True);
535 if ( ClientNMB == -1 )
538 /* we are never interested in SIGPIPE */
539 BlockSignals(True,SIGPIPE);
541 set_socket_options( ClientNMB, "SO_BROADCAST" );
542 set_socket_options( ClientDGRAM, "SO_BROADCAST" );
544 DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
549 /**************************************************************************** **
550 initialise connect, service and file structs
551 **************************************************************************** */
552 static BOOL init_structs(void)
554 extern fstring local_machine;
561 if (! *global_myname)
563 fstrcpy( global_myname, myhostname() );
564 p = strchr_m( global_myname, '.' );
568 strupper( global_myname );
570 /* Add any NETBIOS name aliases. Ensure that the first entry
571 is equal to global_myname.
573 /* Work out the max number of netbios aliases that we have */
574 ptr = lp_netbios_aliases();
577 for( ; *ptr; namecount++,ptr++ )
579 if ( *global_myname )
582 /* Allocate space for the netbios aliases */
583 my_netbios_names = (char **)malloc( sizeof(char *) * (namecount+1) );
584 if( NULL == my_netbios_names )
586 DEBUG( 0, ( "init_structs: malloc fail.\n" ) );
590 /* Use the global_myname string first */
592 if ( *global_myname )
593 my_netbios_names[namecount++] = global_myname;
595 ptr = lp_netbios_aliases();
600 nbname = strdup(*ptr);
603 DEBUG(0,("init_structs: malloc fail when allocating names.\n"));
607 /* Look for duplicates */
609 for( n=0; n<namecount; n++ )
611 if( 0 == strcmp( nbname, my_netbios_names[n] ) )
615 my_netbios_names[namecount++] = nbname;
623 /* Terminate name list */
624 my_netbios_names[namecount++] = NULL;
626 fstrcpy( local_machine, global_myname );
627 trim_string( local_machine, " ", " " );
628 p = strchr_m( local_machine, ' ' );
631 strlower( local_machine );
633 DEBUG( 5, ("Netbios name list:-\n") );
634 for( n=0; my_netbios_names[n]; n++ )
635 DEBUGADD( 5, ( "my_netbios_names[%d]=\"%s\"\n", n, my_netbios_names[n] ) );
640 /**************************************************************************** **
642 **************************************************************************** */
643 static void usage(char *pname)
646 printf( "Usage: %s [-DaohV] [-H lmhosts file] [-d debuglevel] [-l log basename]\n", pname );
647 printf( " [-n name] [-p port] [-s configuration file]\n" );
648 printf( "\t-D Become a daemon\n" );
649 printf( "\t-a Append to log file (default)\n" );
650 printf( "\t-o Overwrite log file, don't append\n" );
651 printf( "\t-h Print usage\n" );
652 printf( "\t-V Print version\n" );
653 printf( "\t-H hosts file Load a netbios hosts file\n" );
654 printf( "\t-d debuglevel Set the debuglevel\n" );
655 printf( "\t-l log basename. Basename for log/debug files\n" );
656 printf( "\t-n netbiosname. Primary netbios name\n" );
657 printf( "\t-p port Listen on the specified port\n" );
658 printf( "\t-s configuration file Configuration file name\n" );
663 /**************************************************************************** **
665 **************************************************************************** */
666 int main(int argc,char *argv[])
670 extern BOOL append_log;
672 append_log = True; /* Default, override with '-o' option. */
674 global_nmb_port = NMB_PORT;
676 global_in_nmbd = True;
678 StartupTime = time(NULL);
680 sys_srandom(time(NULL) ^ sys_getpid());
684 slprintf(debugf, sizeof(debugf)-1, "%s/log.nmbd", LOGFILEBASE);
685 setup_logging( argv[0], False );
688 pstrcpy( host_file, LMHOSTSFILE );
691 /* this is for people who can't start the program correctly */
692 while (argc > 1 && (*argv[1] != '-'))
698 fault_setup((void (*)(void *))fault_continue );
700 /* POSIX demands that signals are inherited. If the invoking process has
701 * these signals masked, we will have problems, as we won't recieve them. */
702 BlockSignals(False, SIGHUP);
703 BlockSignals(False, SIGUSR1);
704 BlockSignals(False, SIGTERM);
706 CatchSignal( SIGHUP, SIGNAL_CAST sig_hup );
707 CatchSignal( SIGTERM, SIGNAL_CAST sig_term );
710 /* we are never interested in SIGFPE */
711 BlockSignals(True,SIGFPE);
714 /* We no longer use USR2... */
716 BlockSignals(True, SIGUSR2);
720 (opt = getopt( argc, argv, "Vaos:T:I:C:bAB:N:Rn:l:d:Dp:hSH:G:f:" )) )
725 pstrcpy(servicesf,optarg);
732 DEBUG(0,("Obsolete option '%c' used\n",opt));
735 pstrcpy(host_file,optarg);
738 pstrcpy(global_myname,optarg);
739 strupper(global_myname);
742 slprintf(debugf, sizeof(debugf)-1, "%s/log.nmbd", optarg);
754 DEBUGLEVEL = atoi(optarg);
757 global_nmb_port = atoi(optarg);
764 printf( "Version %s\n", VERSION );
768 if( !is_a_socket(0) )
770 DEBUG(0,("Incorrect program usage - is the command line correct?\n"));
780 DEBUG( 1, ( "Netbios nameserver version %s started.\n", VERSION ) );
781 DEBUGADD( 1, ( "Copyright Andrew Tridgell 1994-1998\n" ) );
783 if ( !reload_nmbd_services(False) )
789 reload_nmbd_services( True );
791 fstrcpy( global_myworkgroup, lp_workgroup() );
793 if (strequal(global_myworkgroup,"*"))
795 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
801 if (!is_daemon && !is_a_socket(0))
803 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
809 DEBUG( 2, ( "Becoming a daemon.\n" ) );
814 /* Setup the async dns. We do it here so it doesn't have all the other
815 stuff initialised and thus chewing memory and sockets */
816 if(lp_we_are_a_wins_server()) {
821 if (!directory_exist(lp_lockdir(), NULL)) {
822 mkdir(lp_lockdir(), 0755);
825 pidfile_create("nmbd");
827 message_register(MSG_FORCE_ELECTION, nmbd_message_election);
829 DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port ) );
831 if ( !open_sockets( is_daemon, global_nmb_port ) )
834 /* Determine all the IP addresses we have. */
837 /* Create an nmbd subnet record for each of the above. */
838 if( False == create_subnets() )
840 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
844 /* Load in any static local names. */
847 load_lmhosts_file(host_file);
848 DEBUG(3,("Loaded hosts file\n"));
851 /* If we are acting as a WINS server, initialise data structures. */
852 if( !initialise_wins() )
854 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
859 * Register nmbd primary workgroup and nmbd names on all
860 * the broadcast subnets, and on the WINS server (if specified).
861 * Also initiate the startup of our primary workgroup (start
862 * elections if we are setup as being able to be a local
866 if( False == register_my_workgroup_and_names() )
868 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
872 /* We can only take signals in the select. */
873 BlockSignals( True, SIGTERM );