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.
26 #include "module_dummy.h"
30 int global_nmb_port = -1;
32 extern BOOL global_in_nmbd;
34 /* are we running as a daemon ? */
35 static BOOL is_daemon;
37 /* fork or run in foreground ? */
38 static BOOL Fork = True;
40 /* log to standard output ? */
41 static BOOL log_stdout;
43 /* have we found LanMan clients yet? */
44 BOOL found_lm_clients = False;
46 /* what server type are we currently */
48 time_t StartupTime = 0;
50 /**************************************************************************** **
51 Handle a SIGTERM in band.
52 **************************************************************************** */
54 static void terminate(void)
56 DEBUG(0,("Got SIGTERM: going down...\n"));
58 /* Write out wins.dat file if samba is a WINS server */
59 wins_write_database(False);
61 /* Remove all SELF registered names from WINS */
64 /* Announce all server entries as 0 time-to-live, 0 type. */
65 announce_my_servers_removed();
67 /* If there was an async dns child - kill it. */
68 kill_async_dns_child();
73 /**************************************************************************** **
74 Handle a SHUTDOWN message from smbcontrol.
75 **************************************************************************** */
77 static void nmbd_terminate(int msg_type, pid_t src, void *buf, size_t len)
82 /**************************************************************************** **
83 Catch a SIGTERM signal.
84 **************************************************************************** */
86 static SIG_ATOMIC_T got_sig_term;
88 static void sig_term(int sig)
94 /**************************************************************************** **
95 Catch a SIGHUP signal.
96 **************************************************************************** */
98 static SIG_ATOMIC_T reload_after_sighup;
100 static void sig_hup(int sig)
102 reload_after_sighup = 1;
107 /**************************************************************************** **
108 Prepare to dump a core file - carefully!
109 **************************************************************************** */
111 static BOOL dump_core(void)
115 pstrcpy( dname, lp_logfile() );
116 if ((p=strrchr_m(dname,'/')))
118 pstrcat( dname, "/corefiles" );
119 mkdir( dname, 0700 );
120 sys_chown( dname, getuid(), getgid() );
121 chmod( dname, 0700 );
126 #ifdef HAVE_GETRLIMIT
130 getrlimit( RLIMIT_CORE, &rlp );
131 rlp.rlim_cur = MAX( 4*1024*1024, rlp.rlim_cur );
132 setrlimit( RLIMIT_CORE, &rlp );
133 getrlimit( RLIMIT_CORE, &rlp );
134 DEBUG( 3, ( "Core limits now %d %d\n", (int)rlp.rlim_cur, (int)rlp.rlim_max ) );
140 DEBUG(0,("Dumping core in %s\n",dname));
146 /**************************************************************************** **
147 Possibly continue after a fault.
148 **************************************************************************** */
150 static void fault_continue(void)
157 /**************************************************************************** **
158 Expire old names from the namelist and server list.
159 **************************************************************************** */
161 static void expire_names_and_servers(time_t t)
163 static time_t lastrun = 0;
167 if ( t < (lastrun + 5) )
172 * Expire any timed out names on all the broadcast
173 * subnets and those registered with the WINS server.
174 * (nmbd_namelistdb.c)
180 * Go through all the broadcast subnets and for each
181 * workgroup known on that subnet remove any expired
182 * server names. If a workgroup has an empty serverlist
183 * and has itself timed out then remove the workgroup.
184 * (nmbd_workgroupdb.c)
187 expire_workgroups_and_servers(t);
190 /************************************************************************** **
191 Reload the list of network interfaces.
192 ************************************************************************** */
194 static BOOL reload_interfaces(time_t t)
198 struct subnet_record *subrec;
199 extern BOOL rescan_listen_set;
200 extern struct in_addr loopback_ip;
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);
236 if (subrec) register_my_workgroup_one_subnet(subrec);
240 /* find any interfaces that need deleting */
241 for (subrec=subnetlist; subrec; subrec=subrec->next) {
242 for (n=iface_count() - 1; n >= 0; n--) {
243 struct interface *iface = get_interface(n);
244 if (ip_equal(iface->ip, subrec->myip) &&
245 ip_equal(iface->nmask, subrec->mask_ip)) break;
248 /* oops, an interface has disapeared. This is
249 tricky, we don't dare actually free the
250 interface as it could be being used, so
251 instead we just wear the memory leak and
252 remove it from the list of interfaces without
254 DEBUG(2,("Deleting dead interface %s\n",
255 inet_ntoa(subrec->myip)));
256 close_subnet(subrec);
260 rescan_listen_set = True;
262 /* We need to shutdown if there are no subnets... */
263 if (FIRST_SUBNET == NULL) {
264 DEBUG(0,("reload_interfaces: No subnets to listen to. Shutting down...\n"));
270 /**************************************************************************** **
271 Reload the services file.
272 **************************************************************************** */
274 static BOOL reload_nmbd_services(BOOL test)
278 set_remote_machine_name("nmbd", False);
282 pstrcpy( fname,lp_configfile());
283 if (file_exist(fname,NULL) && !strcsequal(fname,dyn_CONFIGFILE)) {
284 pstrcpy(dyn_CONFIGFILE,fname);
289 if ( test && !lp_file_list_changed() )
292 ret = lp_load( dyn_CONFIGFILE, True , False, False);
294 /* perhaps the config filename is now set */
296 DEBUG( 3, ( "services not loaded\n" ) );
297 reload_nmbd_services( True );
303 /**************************************************************************** **
304 The main select loop.
305 **************************************************************************** */
307 static void process(void)
312 time_t t = time(NULL);
314 /* Check for internal messages */
319 * Check all broadcast subnets to see if
320 * we need to run an election on any of them.
324 run_election = check_elections();
327 * Read incoming UDP packets.
331 if(listen_for_packets(run_election))
335 * Handle termination inband.
344 * Process all incoming packets
345 * read above. This calls the success and
346 * failure functions registered when response
347 * packets arrrive, and also deals with request
348 * packets from other sources.
355 * Run any elections - initiate becoming
356 * a local master browser if we have won.
363 * Send out any broadcast announcements
364 * of our server names. This also announces
365 * the workgroup name if we are a local
367 * (nmbd_sendannounce.c)
370 announce_my_server_names(t);
373 * Send out any LanMan broadcast announcements
374 * of our server names.
375 * (nmbd_sendannounce.c)
378 announce_my_lm_server_names(t);
381 * If we are a local master browser, periodically
382 * announce ourselves to the domain master browser.
383 * This also deals with syncronising the domain master
384 * browser server lists with ourselves as a local
386 * (nmbd_sendannounce.c)
389 announce_myself_to_domain_master_browser(t);
392 * Fullfill any remote announce requests.
393 * (nmbd_sendannounce.c)
399 * Fullfill any remote browse sync announce requests.
400 * (nmbd_sendannounce.c)
403 browse_sync_remote(t);
406 * Scan the broadcast subnets, and WINS client
407 * namelists and refresh any that need refreshing.
414 * Scan the subnet namelists and server lists and
415 * expire thos that have timed out.
419 expire_names_and_servers(t);
422 * Write out a snapshot of our current browse list into
423 * the browse.dat file. This is used by smbd to service
424 * incoming NetServerEnum calls - used to synchronise
425 * browse lists over subnets.
426 * (nmbd_serverlistdb.c)
429 write_browse_list(t, False);
432 * If we are a domain master browser, we have a list of
433 * local master browsers we should synchronise browse
434 * lists with (these are added by an incoming local
435 * master browser announcement packet). Expire any of
436 * these that are no longer current, and pull the server
437 * lists from each of these known local master browsers.
438 * (nmbd_browsesync.c)
441 dmb_expire_and_sync_browser_lists(t);
444 * Check that there is a local master browser for our
445 * workgroup for all our broadcast subnets. If one
446 * is not found, start an election (which we ourselves
447 * may or may not participate in, depending on the
448 * setting of the 'local master' parameter.
452 check_master_browser_exists(t);
455 * If we are configured as a logon server, attempt to
456 * register the special NetBIOS names to become such
457 * (WORKGROUP<1c> name) on all broadcast subnets and
458 * with the WINS server (if used). If we are configured
459 * to become a domain master browser, attempt to register
460 * the special NetBIOS name (WORKGROUP<1b> name) to
462 * (nmbd_become_dmb.c)
468 * If we are a WINS server, do any timer dependent
469 * processing required.
470 * (nmbd_winsserver.c)
473 initiate_wins_processing(t);
476 * If we are a domain master browser, attempt to contact the
477 * WINS server to get a list of all known WORKGROUPS/DOMAINS.
478 * This will only work to a Samba WINS server.
479 * (nmbd_browsesync.c)
482 if (lp_enhanced_browsing())
483 collect_all_workgroup_names_from_wins_server(t);
486 * Go through the response record queue and time out or re-transmit
487 * and expired entries.
491 retransmit_or_expire_response_records(t);
494 * check to see if any remote browse sync child processes have completed
497 sync_check_completion();
500 * regularly sync with any other DMBs we know about
503 if (lp_enhanced_browsing())
507 * clear the unexpected packet queue
513 * Reload the services file if we got a sighup.
516 if(reload_after_sighup) {
517 DEBUG( 0, ( "Got SIGHUP dumping debug info.\n" ) );
518 write_browse_list( 0, True );
519 dump_all_namelists();
520 reload_nmbd_services( True );
522 if(reload_interfaces(0))
524 reload_after_sighup = 0;
527 /* check for new network interfaces */
529 if(reload_interfaces(t))
532 /* free up temp memory */
537 /**************************************************************************** **
538 Open the socket communication.
539 **************************************************************************** */
541 static BOOL open_sockets(BOOL isdaemon, int port)
544 * The sockets opened here will be used to receive broadcast
545 * packets *only*. Interface specific sockets are opened in
546 * make_subnet() in namedbsubnet.c. Thus we bind to the
547 * address "0.0.0.0". The parameter 'socket address' is
552 ClientNMB = open_socket_in(SOCK_DGRAM, port,
553 interpret_addr(lp_socket_address()),
558 ClientDGRAM = open_socket_in(SOCK_DGRAM,DGRAM_PORT,3,0,True);
560 if ( ClientNMB == -1 )
563 /* we are never interested in SIGPIPE */
564 BlockSignals(True,SIGPIPE);
566 set_socket_options( ClientNMB, "SO_BROADCAST" );
567 set_socket_options( ClientDGRAM, "SO_BROADCAST" );
569 DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
573 /**************************************************************************** **
575 **************************************************************************** */
576 int main(int argc, const char *argv[])
579 static BOOL opt_interactive;
582 struct poptOption long_options[] = {
584 {"daemon", 'D', POPT_ARG_VAL, &is_daemon, True, "Become a daemon(default)" },
585 {"interactive", 'i', POPT_ARG_VAL, &opt_interactive, True, "Run interactive (not a daemon)" },
586 {"foreground", 'F', POPT_ARG_VAL, &Fork, False, "Run daemon in foreground (for daemontools & etc)" },
587 {"log-stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
588 {"hosts", 'H', POPT_ARG_STRING, dyn_LMHOSTSFILE, 'H', "Load a netbios hosts file"},
589 {"port", 'p', POPT_ARG_INT, &global_nmb_port, NMB_PORT, "Listen on the specified port" },
594 global_nmb_port = NMB_PORT;
596 pc = poptGetContext("nmbd", argc, argv, long_options, 0);
597 while ((opt = poptGetNextOpt(pc)) != -1) ;
600 global_in_nmbd = True;
602 StartupTime = time(NULL);
604 sys_srandom(time(NULL) ^ sys_getpid());
606 slprintf(logfile, sizeof(logfile)-1, "%s/log.nmbd", dyn_LOGFILEBASE);
607 lp_set_logfile(logfile);
609 fault_setup((void (*)(void *))fault_continue );
611 /* POSIX demands that signals are inherited. If the invoking process has
612 * these signals masked, we will have problems, as we won't receive them. */
613 BlockSignals(False, SIGHUP);
614 BlockSignals(False, SIGUSR1);
615 BlockSignals(False, SIGTERM);
617 CatchSignal( SIGHUP, SIGNAL_CAST sig_hup );
618 CatchSignal( SIGTERM, SIGNAL_CAST sig_term );
621 /* we are never interested in SIGFPE */
622 BlockSignals(True,SIGFPE);
625 /* We no longer use USR2... */
627 BlockSignals(True, SIGUSR2);
630 if ( opt_interactive ) {
635 if ( log_stdout && Fork ) {
636 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
640 setup_logging( argv[0], log_stdout );
644 DEBUG( 0, ( "Netbios nameserver version %s started.\n", VERSION ) );
645 DEBUGADD( 0, ( "Copyright Andrew Tridgell and the Samba Team 1994-2003\n" ) );
647 if ( !reload_nmbd_services(False) )
653 reload_nmbd_services( True );
655 if (strequal(lp_workgroup(),"*"))
657 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
663 if (!is_daemon && !is_a_socket(0))
665 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
669 if (is_daemon && !opt_interactive)
671 DEBUG( 2, ( "Becoming a daemon.\n" ) );
677 * If we're interactive we want to set our own process group for
681 setpgid( (pid_t)0, (pid_t)0 );
685 /* Setup the async dns. We do it here so it doesn't have all the other
686 stuff initialised and thus chewing memory and sockets */
687 if(lp_we_are_a_wins_server() && lp_dns_proxy()) {
692 if (!directory_exist(lp_lockdir(), NULL)) {
693 mkdir(lp_lockdir(), 0755);
696 pidfile_create("nmbd");
698 message_register(MSG_FORCE_ELECTION, nmbd_message_election);
699 message_register(MSG_WINS_NEW_ENTRY, nmbd_wins_new_entry);
700 message_register(MSG_SHUTDOWN, nmbd_terminate);
702 DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port ) );
704 if ( !open_sockets( is_daemon, global_nmb_port ) ) {
705 kill_async_dns_child();
709 /* Determine all the IP addresses we have. */
712 /* Create an nmbd subnet record for each of the above. */
713 if( False == create_subnets() )
715 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
716 kill_async_dns_child();
720 /* Load in any static local names. */
721 load_lmhosts_file(dyn_LMHOSTSFILE);
722 DEBUG(3,("Loaded hosts file %s\n", dyn_LMHOSTSFILE));
724 /* If we are acting as a WINS server, initialise data structures. */
725 if( !initialise_wins() )
727 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
728 kill_async_dns_child();
733 * Register nmbd primary workgroup and nmbd names on all
734 * the broadcast subnets, and on the WINS server (if specified).
735 * Also initiate the startup of our primary workgroup (start
736 * elections if we are setup as being able to be a local
740 if( False == register_my_workgroup_and_names() )
742 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
743 kill_async_dns_child();
747 /* We can only take signals in the select. */
748 BlockSignals( True, SIGTERM );
754 kill_async_dns_child();