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
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.
27 int global_nmb_port = -1;
29 extern pstring global_myname;
30 extern fstring global_myworkgroup;
31 extern char **my_netbios_names;
33 extern BOOL global_in_nmbd;
35 /* are we running as a daemon ? */
36 static BOOL is_daemon = False;
38 /* have we found LanMan clients yet? */
39 BOOL found_lm_clients = False;
41 /* what server type are we currently */
43 time_t StartupTime = 0;
45 /**************************************************************************** **
46 Handle a SIGTERM in band.
47 **************************************************************************** */
49 static void terminate(void)
51 DEBUG(0,("Got SIGTERM: going down...\n"));
53 /* Write out wins.dat file if samba is a WINS server */
54 wins_write_database(False);
56 /* Remove all SELF registered names from WINS */
59 /* Announce all server entries as 0 time-to-live, 0 type. */
60 announce_my_servers_removed();
62 /* If there was an async dns child - kill it. */
63 kill_async_dns_child();
68 /**************************************************************************** **
69 Handle a SHUTDOWN message from smbcontrol.
70 **************************************************************************** */
72 static void nmbd_terminate(int msg_type, pid_t src, void *buf, size_t len)
77 /**************************************************************************** **
78 Catch a SIGTERM signal.
79 **************************************************************************** */
81 static SIG_ATOMIC_T got_sig_term;
83 static void sig_term(int sig)
89 /**************************************************************************** **
90 Catch a SIGHUP signal.
91 **************************************************************************** */
93 static SIG_ATOMIC_T reload_after_sighup;
95 static void sig_hup(int sig)
97 reload_after_sighup = 1;
102 /**************************************************************************** **
103 Prepare to dump a core file - carefully!
104 **************************************************************************** */
106 static BOOL dump_core(void)
110 pstrcpy( dname, lp_logfile() );
111 if ((p=strrchr_m(dname,'/')))
113 pstrcat( dname, "/corefiles" );
114 mkdir( dname, 0700 );
115 sys_chown( dname, getuid(), getgid() );
116 chmod( dname, 0700 );
121 #ifdef HAVE_GETRLIMIT
125 getrlimit( RLIMIT_CORE, &rlp );
126 rlp.rlim_cur = MAX( 4*1024*1024, rlp.rlim_cur );
127 setrlimit( RLIMIT_CORE, &rlp );
128 getrlimit( RLIMIT_CORE, &rlp );
129 DEBUG( 3, ( "Core limits now %d %d\n", (int)rlp.rlim_cur, (int)rlp.rlim_max ) );
135 DEBUG(0,("Dumping core in %s\n",dname));
141 /**************************************************************************** **
142 Possibly continue after a fault.
143 **************************************************************************** */
145 static void fault_continue(void)
152 /**************************************************************************** **
153 Expire old names from the namelist and server list.
154 **************************************************************************** */
156 static void expire_names_and_servers(time_t t)
158 static time_t lastrun = 0;
162 if ( t < (lastrun + 5) )
167 * Expire any timed out names on all the broadcast
168 * subnets and those registered with the WINS server.
169 * (nmbd_namelistdb.c)
175 * Go through all the broadcast subnets and for each
176 * workgroup known on that subnet remove any expired
177 * server names. If a workgroup has an empty serverlist
178 * and has itself timed out then remove the workgroup.
179 * (nmbd_workgroupdb.c)
182 expire_workgroups_and_servers(t);
185 /************************************************************************** **
186 Reload the list of network interfaces.
187 ************************************************************************** */
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"));
265 /**************************************************************************** **
266 Reload the services file.
267 **************************************************************************** */
269 static BOOL reload_nmbd_services(BOOL test)
273 set_remote_machine_name("nmbd");
277 pstrcpy( fname,lp_configfile());
278 if (file_exist(fname,NULL) && !strcsequal(fname,dyn_CONFIGFILE)) {
279 pstrcpy(dyn_CONFIGFILE,fname);
284 if ( test && !lp_file_list_changed() )
287 ret = lp_load( dyn_CONFIGFILE, True , False, False);
289 /* perhaps the config filename is now set */
291 DEBUG( 3, ( "services not loaded\n" ) );
292 reload_nmbd_services( True );
298 /**************************************************************************** **
299 The main select loop.
300 **************************************************************************** */
302 static void process(void)
307 time_t t = time(NULL);
309 /* Check for internal messages */
314 * Check all broadcast subnets to see if
315 * we need to run an election on any of them.
319 run_election = check_elections();
322 * Read incoming UDP packets.
326 if(listen_for_packets(run_election))
330 * Handle termination inband.
339 * Process all incoming packets
340 * read above. This calls the success and
341 * failure functions registered when response
342 * packets arrrive, and also deals with request
343 * packets from other sources.
350 * Run any elections - initiate becoming
351 * a local master browser if we have won.
358 * Send out any broadcast announcements
359 * of our server names. This also announces
360 * the workgroup name if we are a local
362 * (nmbd_sendannounce.c)
365 announce_my_server_names(t);
368 * Send out any LanMan broadcast announcements
369 * of our server names.
370 * (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)
384 announce_myself_to_domain_master_browser(t);
387 * Fullfill any remote announce requests.
388 * (nmbd_sendannounce.c)
394 * Fullfill any remote browse sync announce requests.
395 * (nmbd_sendannounce.c)
398 browse_sync_remote(t);
401 * Scan the broadcast subnets, and WINS client
402 * namelists and refresh any that need refreshing.
409 * Scan the subnet namelists and server lists and
410 * expire thos that have timed out.
414 expire_names_and_servers(t);
417 * Write out a snapshot of our current browse list into
418 * the browse.dat file. This is used by smbd to service
419 * incoming NetServerEnum calls - used to synchronise
420 * browse lists over subnets.
421 * (nmbd_serverlistdb.c)
424 write_browse_list(t, False);
427 * If we are a domain master browser, we have a list of
428 * local master browsers we should synchronise browse
429 * lists with (these are added by an incoming local
430 * master browser announcement packet). Expire any of
431 * these that are no longer current, and pull the server
432 * lists from each of these known local master browsers.
433 * (nmbd_browsesync.c)
436 dmb_expire_and_sync_browser_lists(t);
439 * Check that there is a local master browser for our
440 * workgroup for all our broadcast subnets. If one
441 * is not found, start an election (which we ourselves
442 * may or may not participate in, depending on the
443 * setting of the 'local master' parameter.
447 check_master_browser_exists(t);
450 * If we are configured as a logon server, attempt to
451 * register the special NetBIOS names to become such
452 * (WORKGROUP<1c> name) on all broadcast subnets and
453 * with the WINS server (if used). If we are configured
454 * to become a domain master browser, attempt to register
455 * the special NetBIOS name (WORKGROUP<1b> name) to
457 * (nmbd_become_dmb.c)
463 * If we are a WINS server, do any timer dependent
464 * processing required.
465 * (nmbd_winsserver.c)
468 initiate_wins_processing(t);
471 * If we are a domain master browser, attempt to contact the
472 * WINS server to get a list of all known WORKGROUPS/DOMAINS.
473 * This will only work to a Samba WINS server.
474 * (nmbd_browsesync.c)
477 if (lp_enhanced_browsing())
478 collect_all_workgroup_names_from_wins_server(t);
481 * Go through the response record queue and time out or re-transmit
482 * and expired entries.
486 retransmit_or_expire_response_records(t);
489 * check to see if any remote browse sync child processes have completed
492 sync_check_completion();
495 * regularly sync with any other DMBs we know about
498 if (lp_enhanced_browsing())
502 * clear the unexpected packet queue
508 * Reload the services file if we got a sighup.
511 if(reload_after_sighup) {
512 DEBUG( 0, ( "Got SIGHUP dumping debug info.\n" ) );
513 write_browse_list( 0, True );
514 dump_all_namelists();
515 reload_nmbd_services( True );
517 if(reload_interfaces(0))
519 reload_after_sighup = 0;
522 /* check for new network interfaces */
524 if(reload_interfaces(t))
527 /* free up temp memory */
532 /**************************************************************************** **
533 Open the socket communication.
534 **************************************************************************** */
536 static BOOL open_sockets(BOOL isdaemon, int port)
539 * The sockets opened here will be used to receive broadcast
540 * packets *only*. Interface specific sockets are opened in
541 * make_subnet() in namedbsubnet.c. Thus we bind to the
542 * address "0.0.0.0". The parameter 'socket address' is
547 ClientNMB = open_socket_in(SOCK_DGRAM, port,0,0,True);
551 ClientDGRAM = open_socket_in(SOCK_DGRAM,DGRAM_PORT,3,0,True);
553 if ( ClientNMB == -1 )
556 /* we are never interested in SIGPIPE */
557 BlockSignals(True,SIGPIPE);
559 set_socket_options( ClientNMB, "SO_BROADCAST" );
560 set_socket_options( ClientDGRAM, "SO_BROADCAST" );
562 DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
566 /**************************************************************************** **
567 Initialise connect, service and file structs.
568 **************************************************************************** */
570 static BOOL init_structs(void)
572 extern fstring local_machine;
579 if (! *global_myname)
581 fstrcpy( global_myname, myhostname() );
582 p = strchr_m( global_myname, '.' );
586 strupper( global_myname );
588 /* Add any NETBIOS name aliases. Ensure that the first entry
589 is equal to global_myname.
591 /* Work out the max number of netbios aliases that we have */
592 ptr = lp_netbios_aliases();
595 for( ; *ptr; namecount++,ptr++ )
597 if ( *global_myname )
600 /* Allocate space for the netbios aliases */
601 my_netbios_names = (char **)malloc( sizeof(char *) * (namecount+1) );
602 if( NULL == my_netbios_names )
604 DEBUG( 0, ( "init_structs: malloc fail.\n" ) );
608 /* Use the global_myname string first */
610 if ( *global_myname )
611 my_netbios_names[namecount++] = global_myname;
613 ptr = lp_netbios_aliases();
618 nbname = strdup(*ptr);
621 DEBUG(0,("init_structs: malloc fail when allocating names.\n"));
625 /* Look for duplicates */
627 for( n=0; n<namecount; n++ )
629 if( 0 == strcmp( nbname, my_netbios_names[n] ) )
633 my_netbios_names[namecount++] = nbname;
641 /* Terminate name list */
642 my_netbios_names[namecount++] = NULL;
644 fstrcpy( local_machine, global_myname );
645 trim_string( local_machine, " ", " " );
646 p = strchr_m( local_machine, ' ' );
649 strlower( local_machine );
651 DEBUG( 5, ("Netbios name list:-\n") );
652 for( n=0; my_netbios_names[n]; n++ )
653 DEBUGADD( 5, ( "my_netbios_names[%d]=\"%s\"\n", n, my_netbios_names[n] ) );
658 /**************************************************************************** **
659 Usage on the program.
660 **************************************************************************** */
662 static void usage(char *pname)
665 printf( "Usage: %s [-DaiohV] [-H lmhosts file] [-d debuglevel] [-l log basename]\n", pname );
666 printf( " [-n name] [-p port] [-s configuration file]\n" );
667 printf( "\t-D Become a daemon (default)\n" );
668 printf( "\t-a Append to log file (default)\n" );
669 printf( "\t-i Run interactive (not a daemon)\n" );
670 printf( "\t-o Overwrite log file, don't append\n" );
671 printf( "\t-h Print usage\n" );
672 printf( "\t-V Print version\n" );
673 printf( "\t-H hosts file Load a netbios hosts file\n" );
674 printf( "\t-d debuglevel Set the debuglevel\n" );
675 printf( "\t-l log basename. Basename for log/debug files\n" );
676 printf( "\t-n netbiosname. Primary netbios name\n" );
677 printf( "\t-p port Listen on the specified port\n" );
678 printf( "\t-s configuration file Configuration file name\n" );
683 /**************************************************************************** **
685 **************************************************************************** */
686 int main(int argc,char *argv[])
690 extern BOOL append_log;
691 BOOL opt_interactive = False;
694 append_log = True; /* Default, override with '-o' option. */
696 global_nmb_port = NMB_PORT;
697 global_in_nmbd = True;
699 StartupTime = time(NULL);
701 sys_srandom(time(NULL) ^ sys_getpid());
703 slprintf(logfile, sizeof(logfile)-1, "%s/log.nmbd", dyn_LOGFILEBASE);
704 lp_set_logfile(logfile);
706 /* this is for people who can't start the program correctly */
707 while (argc > 1 && (*argv[1] != '-'))
713 fault_setup((void (*)(void *))fault_continue );
715 /* POSIX demands that signals are inherited. If the invoking process has
716 * these signals masked, we will have problems, as we won't recieve them. */
717 BlockSignals(False, SIGHUP);
718 BlockSignals(False, SIGUSR1);
719 BlockSignals(False, SIGTERM);
721 CatchSignal( SIGHUP, SIGNAL_CAST sig_hup );
722 CatchSignal( SIGTERM, SIGNAL_CAST sig_term );
725 /* we are never interested in SIGFPE */
726 BlockSignals(True,SIGFPE);
729 /* We no longer use USR2... */
731 BlockSignals(True, SIGUSR2);
735 (opt = getopt( argc, argv, "Vaos:T:I:C:bAB:N:Rn:l:d:Dp:hSH:G:f:i" )) )
740 pstrcpy(dyn_CONFIGFILE, optarg);
747 DEBUG(0,("Obsolete option '%c' used\n",opt));
750 opt_interactive = True;
753 pstrcpy(dyn_LMHOSTSFILE, optarg);
756 pstrcpy(global_myname,optarg);
757 strupper(global_myname);
760 slprintf(logfile, sizeof(logfile)-1, "%s/log.nmbd", optarg);
761 lp_set_logfile(logfile);
773 DEBUGLEVEL = atoi(optarg);
776 global_nmb_port = atoi(optarg);
783 printf( "Version %s\n", VERSION );
787 if( !is_a_socket(0) )
789 DEBUG(0,("Incorrect program usage - is the command line correct?\n"));
797 setup_logging( argv[0], opt_interactive );
801 DEBUG( 0, ( "Netbios nameserver version %s started.\n", VERSION ) );
802 DEBUGADD( 0, ( "Copyright Andrew Tridgell and the Samba Team 1994-2002\n" ) );
804 if ( !reload_nmbd_services(False) )
810 reload_nmbd_services( True );
812 fstrcpy( global_myworkgroup, lp_workgroup() );
814 if (strequal(global_myworkgroup,"*"))
816 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
822 if (!is_daemon && !is_a_socket(0))
824 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
828 if (is_daemon && !opt_interactive)
830 DEBUG( 2, ( "Becoming a daemon.\n" ) );
836 * If we're interactive we want to set our own process group for
840 setpgid( (pid_t)0, (pid_t)0 );
844 /* Setup the async dns. We do it here so it doesn't have all the other
845 stuff initialised and thus chewing memory and sockets */
846 if(lp_we_are_a_wins_server() && lp_dns_proxy()) {
851 if (!directory_exist(lp_lockdir(), NULL)) {
852 mkdir(lp_lockdir(), 0755);
855 pidfile_create("nmbd");
857 message_register(MSG_FORCE_ELECTION, nmbd_message_election);
858 message_register(MSG_WINS_NEW_ENTRY, nmbd_wins_new_entry);
859 message_register(MSG_SHUTDOWN, nmbd_terminate);
861 DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port ) );
863 if ( !open_sockets( is_daemon, global_nmb_port ) ) {
864 kill_async_dns_child();
868 /* Determine all the IP addresses we have. */
871 /* Create an nmbd subnet record for each of the above. */
872 if( False == create_subnets() )
874 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
875 kill_async_dns_child();
879 /* Load in any static local names. */
880 load_lmhosts_file(dyn_LMHOSTSFILE);
881 DEBUG(3,("Loaded hosts file %s\n", dyn_LMHOSTSFILE));
883 /* If we are acting as a WINS server, initialise data structures. */
884 if( !initialise_wins() )
886 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
887 kill_async_dns_child();
892 * Register nmbd primary workgroup and nmbd names on all
893 * the broadcast subnets, and on the WINS server (if specified).
894 * Also initiate the startup of our primary workgroup (start
895 * elections if we are setup as being able to be a local
899 if( False == register_my_workgroup_and_names() )
901 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
902 kill_async_dns_child();
906 /* We can only take signals in the select. */
907 BlockSignals( True, SIGTERM );
913 kill_async_dns_child();