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)
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 2 of the License, or
11 (at your option) any later version.
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.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 int global_nmb_port = -1;
30 extern BOOL rescan_listen_set;
31 extern struct in_addr loopback_ip;
32 extern BOOL global_in_nmbd;
34 extern BOOL override_logfile;
36 /* are we running as a daemon ? */
37 static BOOL is_daemon;
39 /* fork or run in foreground ? */
40 static BOOL Fork = True;
42 /* log to standard output ? */
43 static BOOL log_stdout;
45 /* have we found LanMan clients yet? */
46 BOOL found_lm_clients = False;
48 /* what server type are we currently */
50 time_t StartupTime = 0;
52 /**************************************************************************** **
53 Handle a SIGTERM in band.
54 **************************************************************************** */
56 static void terminate(void)
58 DEBUG(0,("Got SIGTERM: going down...\n"));
60 /* Write out wins.dat file if samba is a WINS server */
61 wins_write_database(False);
63 /* Remove all SELF registered names from WINS */
66 /* Announce all server entries as 0 time-to-live, 0 type. */
67 announce_my_servers_removed();
69 /* If there was an async dns child - kill it. */
70 kill_async_dns_child();
75 /**************************************************************************** **
76 Handle a SHUTDOWN message from smbcontrol.
77 **************************************************************************** */
79 static void nmbd_terminate(int msg_type, pid_t src, void *buf, size_t len)
84 /**************************************************************************** **
85 Catch a SIGTERM signal.
86 **************************************************************************** */
88 static SIG_ATOMIC_T got_sig_term;
90 static void sig_term(int sig)
96 /**************************************************************************** **
97 Catch a SIGHUP signal.
98 **************************************************************************** */
100 static SIG_ATOMIC_T reload_after_sighup;
102 static void sig_hup(int sig)
104 reload_after_sighup = 1;
109 /**************************************************************************** **
110 Prepare to dump a core file - carefully!
111 **************************************************************************** */
113 static BOOL dump_core(void)
117 pstrcpy( dname, lp_logfile() );
118 if ((p=strrchr_m(dname,'/')))
120 pstrcat( dname, "/corefiles" );
121 mkdir( dname, 0700 );
122 sys_chown( dname, getuid(), getgid() );
123 chmod( dname, 0700 );
128 #ifdef HAVE_GETRLIMIT
132 getrlimit( RLIMIT_CORE, &rlp );
133 rlp.rlim_cur = MAX( 4*1024*1024, rlp.rlim_cur );
134 setrlimit( RLIMIT_CORE, &rlp );
135 getrlimit( RLIMIT_CORE, &rlp );
136 DEBUG( 3, ( "Core limits now %d %d\n", (int)rlp.rlim_cur, (int)rlp.rlim_max ) );
142 DEBUG(0,("Dumping core in %s\n",dname));
148 /**************************************************************************** **
149 Possibly continue after a fault.
150 **************************************************************************** */
152 static void fault_continue(void)
159 /**************************************************************************** **
160 Expire old names from the namelist and server list.
161 **************************************************************************** */
163 static void expire_names_and_servers(time_t t)
165 static time_t lastrun = 0;
169 if ( t < (lastrun + 5) )
174 * Expire any timed out names on all the broadcast
175 * subnets and those registered with the WINS server.
176 * (nmbd_namelistdb.c)
182 * Go through all the broadcast subnets and for each
183 * workgroup known on that subnet remove any expired
184 * server names. If a workgroup has an empty serverlist
185 * and has itself timed out then remove the workgroup.
186 * (nmbd_workgroupdb.c)
189 expire_workgroups_and_servers(t);
192 /************************************************************************** **
193 Reload the list of network interfaces.
194 ************************************************************************** */
196 static BOOL reload_interfaces(time_t t)
200 struct subnet_record *subrec;
202 if (t && ((t - lastt) < NMBD_INTERFACES_RELOAD)) return False;
205 if (!interfaces_changed()) return False;
207 /* the list of probed interfaces has changed, we may need to add/remove
211 /* find any interfaces that need adding */
212 for (n=iface_count() - 1; n >= 0; n--) {
213 struct interface *iface = get_interface(n);
216 * We don't want to add a loopback interface, in case
217 * someone has added 127.0.0.1 for smbd, nmbd needs to
218 * ignore it here. JRA.
221 if (ip_equal(iface->ip, loopback_ip)) {
222 DEBUG(2,("reload_interfaces: Ignoring loopback interface %s\n", inet_ntoa(iface->ip)));
226 for (subrec=subnetlist; subrec; subrec=subrec->next) {
227 if (ip_equal(iface->ip, subrec->myip) &&
228 ip_equal(iface->nmask, subrec->mask_ip)) break;
232 /* it wasn't found! add it */
233 DEBUG(2,("Found new interface %s\n",
234 inet_ntoa(iface->ip)));
235 subrec = make_normal_subnet(iface);
237 register_my_workgroup_one_subnet(subrec);
241 /* find any interfaces that need deleting */
242 for (subrec=subnetlist; subrec; subrec=subrec->next) {
243 for (n=iface_count() - 1; n >= 0; n--) {
244 struct interface *iface = get_interface(n);
245 if (ip_equal(iface->ip, subrec->myip) &&
246 ip_equal(iface->nmask, subrec->mask_ip)) break;
249 /* oops, an interface has disapeared. This is
250 tricky, we don't dare actually free the
251 interface as it could be being used, so
252 instead we just wear the memory leak and
253 remove it from the list of interfaces without
255 DEBUG(2,("Deleting dead interface %s\n",
256 inet_ntoa(subrec->myip)));
257 close_subnet(subrec);
261 rescan_listen_set = True;
263 /* We need to shutdown if there are no subnets... */
264 if (FIRST_SUBNET == NULL) {
265 DEBUG(0,("reload_interfaces: No subnets to listen to. Shutting down...\n"));
271 /**************************************************************************** **
272 Reload the services file.
273 **************************************************************************** */
275 static BOOL reload_nmbd_services(BOOL test)
279 set_remote_machine_name("nmbd", False);
283 pstrcpy( fname,lp_configfile());
284 if (file_exist(fname,NULL) && !strcsequal(fname,dyn_CONFIGFILE)) {
285 pstrcpy(dyn_CONFIGFILE,fname);
290 if ( test && !lp_file_list_changed() )
293 ret = lp_load( dyn_CONFIGFILE, True , False, False);
295 /* perhaps the config filename is now set */
297 DEBUG( 3, ( "services not loaded\n" ) );
298 reload_nmbd_services( True );
304 /**************************************************************************** **
305 * React on 'smbcontrol nmbd reload-config' in the same way as to SIGHUP
306 * We use buf here to return BOOL result to process() when reload_interfaces()
307 * detects that there are no subnets.
308 **************************************************************************** */
310 static void msg_reload_nmbd_services(int msg_type, pid_t src, void *buf, size_t len)
312 write_browse_list( 0, True );
313 dump_all_namelists();
314 reload_nmbd_services( True );
318 /* We were called from process() */
319 /* If reload_interfaces() returned True */
320 /* we need to shutdown if there are no subnets... */
321 /* pass this info back to process() */
322 *((BOOL*)buf) = reload_interfaces(0);
327 /**************************************************************************** **
328 The main select loop.
329 **************************************************************************** */
331 static void process(void)
337 time_t t = time(NULL);
339 /* Check for internal messages */
344 * Check all broadcast subnets to see if
345 * we need to run an election on any of them.
349 run_election = check_elections();
352 * Read incoming UDP packets.
356 if(listen_for_packets(run_election))
360 * Handle termination inband.
369 * Process all incoming packets
370 * read above. This calls the success and
371 * failure functions registered when response
372 * packets arrrive, and also deals with request
373 * packets from other sources.
380 * Run any elections - initiate becoming
381 * a local master browser if we have won.
388 * Send out any broadcast announcements
389 * of our server names. This also announces
390 * the workgroup name if we are a local
392 * (nmbd_sendannounce.c)
395 announce_my_server_names(t);
398 * Send out any LanMan broadcast announcements
399 * of our server names.
400 * (nmbd_sendannounce.c)
403 announce_my_lm_server_names(t);
406 * If we are a local master browser, periodically
407 * announce ourselves to the domain master browser.
408 * This also deals with syncronising the domain master
409 * browser server lists with ourselves as a local
411 * (nmbd_sendannounce.c)
414 announce_myself_to_domain_master_browser(t);
417 * Fullfill any remote announce requests.
418 * (nmbd_sendannounce.c)
424 * Fullfill any remote browse sync announce requests.
425 * (nmbd_sendannounce.c)
428 browse_sync_remote(t);
431 * Scan the broadcast subnets, and WINS client
432 * namelists and refresh any that need refreshing.
439 * Scan the subnet namelists and server lists and
440 * expire thos that have timed out.
444 expire_names_and_servers(t);
447 * Write out a snapshot of our current browse list into
448 * the browse.dat file. This is used by smbd to service
449 * incoming NetServerEnum calls - used to synchronise
450 * browse lists over subnets.
451 * (nmbd_serverlistdb.c)
454 write_browse_list(t, False);
457 * If we are a domain master browser, we have a list of
458 * local master browsers we should synchronise browse
459 * lists with (these are added by an incoming local
460 * master browser announcement packet). Expire any of
461 * these that are no longer current, and pull the server
462 * lists from each of these known local master browsers.
463 * (nmbd_browsesync.c)
466 dmb_expire_and_sync_browser_lists(t);
469 * Check that there is a local master browser for our
470 * workgroup for all our broadcast subnets. If one
471 * is not found, start an election (which we ourselves
472 * may or may not participate in, depending on the
473 * setting of the 'local master' parameter.
477 check_master_browser_exists(t);
480 * If we are configured as a logon server, attempt to
481 * register the special NetBIOS names to become such
482 * (WORKGROUP<1c> name) on all broadcast subnets and
483 * with the WINS server (if used). If we are configured
484 * to become a domain master browser, attempt to register
485 * the special NetBIOS name (WORKGROUP<1b> name) to
487 * (nmbd_become_dmb.c)
493 * If we are a WINS server, do any timer dependent
494 * processing required.
495 * (nmbd_winsserver.c)
498 initiate_wins_processing(t);
501 * If we are a domain master browser, attempt to contact the
502 * WINS server to get a list of all known WORKGROUPS/DOMAINS.
503 * This will only work to a Samba WINS server.
504 * (nmbd_browsesync.c)
507 if (lp_enhanced_browsing())
508 collect_all_workgroup_names_from_wins_server(t);
511 * Go through the response record queue and time out or re-transmit
512 * and expired entries.
516 retransmit_or_expire_response_records(t);
519 * check to see if any remote browse sync child processes have completed
522 sync_check_completion();
525 * regularly sync with any other DMBs we know about
528 if (lp_enhanced_browsing())
532 * clear the unexpected packet queue
538 * Reload the services file if we got a sighup.
541 if(reload_after_sighup) {
542 DEBUG( 0, ( "Got SIGHUP dumping debug info.\n" ) );
543 msg_reload_nmbd_services(MSG_SMB_CONF_UPDATED, (pid_t) 0, (void*) &no_subnets, 0);
546 reload_after_sighup = 0;
549 /* check for new network interfaces */
551 if(reload_interfaces(t))
554 /* free up temp memory */
559 /**************************************************************************** **
560 Open the socket communication.
561 **************************************************************************** */
563 static BOOL open_sockets(BOOL isdaemon, int port)
566 * The sockets opened here will be used to receive broadcast
567 * packets *only*. Interface specific sockets are opened in
568 * make_subnet() in namedbsubnet.c. Thus we bind to the
569 * address "0.0.0.0". The parameter 'socket address' is
574 ClientNMB = open_socket_in(SOCK_DGRAM, port,
575 0, interpret_addr(lp_socket_address()),
580 ClientDGRAM = open_socket_in(SOCK_DGRAM,DGRAM_PORT,3,0,True);
582 if ( ClientNMB == -1 )
585 /* we are never interested in SIGPIPE */
586 BlockSignals(True,SIGPIPE);
588 set_socket_options( ClientNMB, "SO_BROADCAST" );
589 set_socket_options( ClientDGRAM, "SO_BROADCAST" );
591 DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
595 /**************************************************************************** **
597 **************************************************************************** */
598 int main(int argc, const char *argv[])
601 static BOOL opt_interactive;
604 struct poptOption long_options[] = {
606 {"daemon", 'D', POPT_ARG_VAL, &is_daemon, True, "Become a daemon(default)" },
607 {"interactive", 'i', POPT_ARG_VAL, &opt_interactive, True, "Run interactive (not a daemon)" },
608 {"foreground", 'F', POPT_ARG_VAL, &Fork, False, "Run daemon in foreground (for daemontools & etc)" },
609 {"log-stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
610 {"hosts", 'H', POPT_ARG_STRING, dyn_LMHOSTSFILE, 'H', "Load a netbios hosts file"},
611 {"port", 'p', POPT_ARG_INT, &global_nmb_port, NMB_PORT, "Listen on the specified port" },
616 global_nmb_port = NMB_PORT;
618 pc = poptGetContext("nmbd", argc, argv, long_options, 0);
619 while ((opt = poptGetNextOpt(pc)) != -1) ;
622 global_in_nmbd = True;
624 StartupTime = time(NULL);
626 sys_srandom(time(NULL) ^ sys_getpid());
628 if (!override_logfile) {
629 slprintf(logfile, sizeof(logfile)-1, "%s/log.nmbd", dyn_LOGFILEBASE);
630 lp_set_logfile(logfile);
633 fault_setup((void (*)(void *))fault_continue );
635 /* POSIX demands that signals are inherited. If the invoking process has
636 * these signals masked, we will have problems, as we won't receive them. */
637 BlockSignals(False, SIGHUP);
638 BlockSignals(False, SIGUSR1);
639 BlockSignals(False, SIGTERM);
641 CatchSignal( SIGHUP, SIGNAL_CAST sig_hup );
642 CatchSignal( SIGTERM, SIGNAL_CAST sig_term );
645 /* we are never interested in SIGFPE */
646 BlockSignals(True,SIGFPE);
649 /* We no longer use USR2... */
651 BlockSignals(True, SIGUSR2);
654 if ( opt_interactive ) {
659 if ( log_stdout && Fork ) {
660 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
664 setup_logging( argv[0], log_stdout );
668 DEBUG( 0, ( "Netbios nameserver version %s started.\n", SAMBA_VERSION_STRING) );
669 DEBUGADD( 0, ( "Copyright Andrew Tridgell and the Samba Team 1994-2004\n" ) );
671 if ( !reload_nmbd_services(False) )
677 reload_nmbd_services( True );
679 if (strequal(lp_workgroup(),"*")) {
680 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
686 if (!is_daemon && !is_a_socket(0)) {
687 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
691 if (is_daemon && !opt_interactive) {
692 DEBUG( 2, ( "Becoming a daemon.\n" ) );
698 * If we're interactive we want to set our own process group for
702 setpgid( (pid_t)0, (pid_t)0 );
706 /* Setup the async dns. We do it here so it doesn't have all the other
707 stuff initialised and thus chewing memory and sockets */
708 if(lp_we_are_a_wins_server() && lp_dns_proxy()) {
713 if (!directory_exist(lp_lockdir(), NULL)) {
714 mkdir(lp_lockdir(), 0755);
717 pidfile_create("nmbd");
719 message_register(MSG_FORCE_ELECTION, nmbd_message_election);
720 message_register(MSG_WINS_NEW_ENTRY, nmbd_wins_new_entry);
721 message_register(MSG_SHUTDOWN, nmbd_terminate);
722 message_register(MSG_SMB_CONF_UPDATED, msg_reload_nmbd_services);
724 DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port ) );
726 if ( !open_sockets( is_daemon, global_nmb_port ) ) {
727 kill_async_dns_child();
731 /* Determine all the IP addresses we have. */
734 /* Create an nmbd subnet record for each of the above. */
735 if( False == create_subnets() ) {
736 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
737 kill_async_dns_child();
741 /* Load in any static local names. */
742 load_lmhosts_file(dyn_LMHOSTSFILE);
743 DEBUG(3,("Loaded hosts file %s\n", dyn_LMHOSTSFILE));
745 /* If we are acting as a WINS server, initialise data structures. */
746 if( !initialise_wins() ) {
747 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
748 kill_async_dns_child();
753 * Register nmbd primary workgroup and nmbd names on all
754 * the broadcast subnets, and on the WINS server (if specified).
755 * Also initiate the startup of our primary workgroup (start
756 * elections if we are setup as being able to be a local
760 if( False == register_my_workgroup_and_names() ) {
761 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
762 kill_async_dns_child();
766 /* We can only take signals in the select. */
767 BlockSignals( True, SIGTERM );
773 kill_async_dns_child();