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 3 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, see <http://www.gnu.org/licenses/>.
23 #include "system/filesys.h"
24 #include "popt_common.h"
25 #include "nmbd/nmbd.h"
31 int global_nmb_port = -1;
33 extern bool rescan_listen_set;
34 extern bool global_in_nmbd;
36 extern bool override_logfile;
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 struct event_context *nmbd_event_context(void)
47 return server_event_context();
50 static struct messaging_context *nmbd_messaging_context(void)
52 struct messaging_context *msg_ctx = server_messaging_context();
53 if (likely(msg_ctx != NULL)) {
56 smb_panic("Could not init nmbd's messaging context.\n");
60 /**************************************************************************** **
61 Handle a SIGTERM in band.
62 **************************************************************************** */
64 static void terminate(struct messaging_context *msg)
66 DEBUG(0,("Got SIGTERM: going down...\n"));
68 /* Write out wins.dat file if samba is a WINS server */
69 wins_write_database(0,False);
71 /* Remove all SELF registered names from WINS */
74 /* Announce all server entries as 0 time-to-live, 0 type. */
75 announce_my_servers_removed();
77 /* If there was an async dns child - kill it. */
78 kill_async_dns_child();
81 serverid_deregister(messaging_server_id(msg));
88 static void nmbd_sig_term_handler(struct tevent_context *ev,
89 struct tevent_signal *se,
95 struct messaging_context *msg = talloc_get_type_abort(
96 private_data, struct messaging_context);
101 static bool nmbd_setup_sig_term_handler(struct messaging_context *msg)
103 struct tevent_signal *se;
105 se = tevent_add_signal(nmbd_event_context(),
106 nmbd_event_context(),
108 nmbd_sig_term_handler,
111 DEBUG(0,("failed to setup SIGTERM handler"));
118 static void msg_reload_nmbd_services(struct messaging_context *msg,
121 struct server_id server_id,
124 static void nmbd_sig_hup_handler(struct tevent_context *ev,
125 struct tevent_signal *se,
131 struct messaging_context *msg = talloc_get_type_abort(
132 private_data, struct messaging_context);
134 DEBUG(0,("Got SIGHUP dumping debug info.\n"));
135 msg_reload_nmbd_services(msg, NULL, MSG_SMB_CONF_UPDATED,
136 messaging_server_id(msg), NULL);
139 static bool nmbd_setup_sig_hup_handler(struct messaging_context *msg)
141 struct tevent_signal *se;
143 se = tevent_add_signal(nmbd_event_context(),
144 nmbd_event_context(),
146 nmbd_sig_hup_handler,
149 DEBUG(0,("failed to setup SIGHUP handler"));
156 /**************************************************************************** **
157 Handle a SHUTDOWN message from smbcontrol.
158 **************************************************************************** */
160 static void nmbd_terminate(struct messaging_context *msg,
163 struct server_id server_id,
169 /**************************************************************************** **
170 Expire old names from the namelist and server list.
171 **************************************************************************** */
173 static void expire_names_and_servers(time_t t)
175 static time_t lastrun = 0;
179 if ( t < (lastrun + 5) )
184 * Expire any timed out names on all the broadcast
185 * subnets and those registered with the WINS server.
186 * (nmbd_namelistdb.c)
192 * Go through all the broadcast subnets and for each
193 * workgroup known on that subnet remove any expired
194 * server names. If a workgroup has an empty serverlist
195 * and has itself timed out then remove the workgroup.
196 * (nmbd_workgroupdb.c)
199 expire_workgroups_and_servers(t);
202 /************************************************************************** **
203 Reload the list of network interfaces.
204 Doesn't return until a network interface is up.
205 ************************************************************************** */
207 static void reload_interfaces(time_t t)
211 bool print_waiting_msg = true;
212 struct subnet_record *subrec;
214 if (t && ((t - lastt) < NMBD_INTERFACES_RELOAD)) {
220 if (!interfaces_changed()) {
226 /* the list of probed interfaces has changed, we may need to add/remove
230 /* find any interfaces that need adding */
231 for (n=iface_count() - 1; n >= 0; n--) {
232 char str[INET6_ADDRSTRLEN];
233 const struct interface *iface = get_interface(n);
234 struct in_addr ip, nmask;
237 DEBUG(2,("reload_interfaces: failed to get interface %d\n", n));
241 /* Ensure we're only dealing with IPv4 here. */
242 if (iface->ip.ss_family != AF_INET) {
243 DEBUG(2,("reload_interfaces: "
244 "ignoring non IPv4 interface.\n"));
248 ip = ((const struct sockaddr_in *)(const void *)&iface->ip)->sin_addr;
249 nmask = ((const struct sockaddr_in *)(const void *)
250 &iface->netmask)->sin_addr;
253 * We don't want to add a loopback interface, in case
254 * someone has added 127.0.0.1 for smbd, nmbd needs to
255 * ignore it here. JRA.
258 if (is_loopback_addr((const struct sockaddr *)(const void *)&iface->ip)) {
259 DEBUG(2,("reload_interfaces: Ignoring loopback "
261 print_sockaddr(str, sizeof(str), &iface->ip) ));
265 for (subrec=subnetlist; subrec; subrec=subrec->next) {
266 if (ip_equal_v4(ip, subrec->myip) &&
267 ip_equal_v4(nmask, subrec->mask_ip)) {
273 /* it wasn't found! add it */
274 DEBUG(2,("Found new interface %s\n",
276 sizeof(str), &iface->ip) ));
277 subrec = make_normal_subnet(iface);
279 register_my_workgroup_one_subnet(subrec);
283 /* find any interfaces that need deleting */
284 for (subrec=subnetlist; subrec; subrec=subrec->next) {
285 for (n=iface_count() - 1; n >= 0; n--) {
286 struct interface *iface = get_interface(n);
287 struct in_addr ip, nmask;
291 /* Ensure we're only dealing with IPv4 here. */
292 if (iface->ip.ss_family != AF_INET) {
293 DEBUG(2,("reload_interfaces: "
294 "ignoring non IPv4 interface.\n"));
297 ip = ((struct sockaddr_in *)(void *)
298 &iface->ip)->sin_addr;
299 nmask = ((struct sockaddr_in *)(void *)
300 &iface->netmask)->sin_addr;
301 if (ip_equal_v4(ip, subrec->myip) &&
302 ip_equal_v4(nmask, subrec->mask_ip)) {
307 /* oops, an interface has disapeared. This is
308 tricky, we don't dare actually free the
309 interface as it could be being used, so
310 instead we just wear the memory leak and
311 remove it from the list of interfaces without
313 DEBUG(2,("Deleting dead interface %s\n",
314 inet_ntoa(subrec->myip)));
315 close_subnet(subrec);
319 rescan_listen_set = True;
321 /* We need to wait if there are no subnets... */
322 if (FIRST_SUBNET == NULL) {
323 void (*saved_handler)(int);
325 if (print_waiting_msg) {
326 DEBUG(0,("reload_interfaces: "
327 "No subnets to listen to. Waiting..\n"));
328 print_waiting_msg = false;
332 * Whilst we're waiting for an interface, allow SIGTERM to
335 saved_handler = CatchSignal(SIGTERM, SIG_DFL);
337 /* We only count IPv4, non-loopback interfaces here. */
338 while (iface_count_v4_nl() == 0) {
343 CatchSignal(SIGTERM, saved_handler);
346 * We got an interface, go back to blocking term.
353 /**************************************************************************** **
354 Reload the services file.
355 **************************************************************************** */
357 static bool reload_nmbd_services(bool test)
361 set_remote_machine_name("nmbd", False);
364 const char *fname = lp_configfile();
365 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
366 set_dyn_CONFIGFILE(fname);
371 if ( test && !lp_file_list_changed() )
374 ret = lp_load_global(get_dyn_CONFIGFILE());
376 /* perhaps the config filename is now set */
378 DEBUG( 3, ( "services not loaded\n" ) );
379 reload_nmbd_services( True );
385 /**************************************************************************** **
386 * React on 'smbcontrol nmbd reload-config' in the same way as to SIGHUP
387 **************************************************************************** */
389 static void msg_reload_nmbd_services(struct messaging_context *msg,
392 struct server_id server_id,
395 write_browse_list( 0, True );
396 dump_all_namelists();
397 reload_nmbd_services( True );
399 reload_interfaces(0);
402 static void msg_nmbd_send_packet(struct messaging_context *msg,
405 struct server_id src,
408 struct packet_struct *p = (struct packet_struct *)data->data;
409 struct subnet_record *subrec;
410 struct sockaddr_storage ss;
411 const struct sockaddr_storage *pss;
412 const struct in_addr *local_ip;
414 DEBUG(10, ("Received send_packet from %u\n", (unsigned int)procid_to_pid(&src)));
416 if (data->length != sizeof(struct packet_struct)) {
417 DEBUG(2, ("Discarding invalid packet length from %u\n",
418 (unsigned int)procid_to_pid(&src)));
422 if ((p->packet_type != NMB_PACKET) &&
423 (p->packet_type != DGRAM_PACKET)) {
424 DEBUG(2, ("Discarding invalid packet type from %u: %d\n",
425 (unsigned int)procid_to_pid(&src), p->packet_type));
429 in_addr_to_sockaddr_storage(&ss, p->ip);
430 pss = iface_ip((struct sockaddr *)(void *)&ss);
433 DEBUG(2, ("Could not find ip for packet from %u\n",
434 (unsigned int)procid_to_pid(&src)));
438 local_ip = &((const struct sockaddr_in *)pss)->sin_addr;
439 subrec = FIRST_SUBNET;
442 p->send_fd = (p->packet_type == NMB_PACKET) ?
443 subrec->nmb_sock : subrec->dgram_sock;
445 for (subrec = FIRST_SUBNET; subrec != NULL;
446 subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
447 if (ip_equal_v4(*local_ip, subrec->myip)) {
448 p->send_fd = (p->packet_type == NMB_PACKET) ?
449 subrec->nmb_sock : subrec->dgram_sock;
454 if (p->packet_type == DGRAM_PACKET) {
456 p->packet.dgram.header.source_ip.s_addr = local_ip->s_addr;
457 p->packet.dgram.header.source_port = 138;
463 /**************************************************************************** **
464 The main select loop.
465 **************************************************************************** */
467 static void process(struct messaging_context *msg)
472 time_t t = time(NULL);
473 TALLOC_CTX *frame = talloc_stackframe();
476 * Check all broadcast subnets to see if
477 * we need to run an election on any of them.
481 run_election = check_elections();
484 * Read incoming UDP packets.
488 if (listen_for_packets(msg, run_election)) {
494 * Process all incoming packets
495 * read above. This calls the success and
496 * failure functions registered when response
497 * packets arrrive, and also deals with request
498 * packets from other sources.
505 * Run any elections - initiate becoming
506 * a local master browser if we have won.
513 * Send out any broadcast announcements
514 * of our server names. This also announces
515 * the workgroup name if we are a local
517 * (nmbd_sendannounce.c)
520 announce_my_server_names(t);
523 * Send out any LanMan broadcast announcements
524 * of our server names.
525 * (nmbd_sendannounce.c)
528 announce_my_lm_server_names(t);
531 * If we are a local master browser, periodically
532 * announce ourselves to the domain master browser.
533 * This also deals with syncronising the domain master
534 * browser server lists with ourselves as a local
536 * (nmbd_sendannounce.c)
539 announce_myself_to_domain_master_browser(t);
542 * Fullfill any remote announce requests.
543 * (nmbd_sendannounce.c)
549 * Fullfill any remote browse sync announce requests.
550 * (nmbd_sendannounce.c)
553 browse_sync_remote(t);
556 * Scan the broadcast subnets, and WINS client
557 * namelists and refresh any that need refreshing.
564 * Scan the subnet namelists and server lists and
565 * expire thos that have timed out.
569 expire_names_and_servers(t);
572 * Write out a snapshot of our current browse list into
573 * the browse.dat file. This is used by smbd to service
574 * incoming NetServerEnum calls - used to synchronise
575 * browse lists over subnets.
576 * (nmbd_serverlistdb.c)
579 write_browse_list(t, False);
582 * If we are a domain master browser, we have a list of
583 * local master browsers we should synchronise browse
584 * lists with (these are added by an incoming local
585 * master browser announcement packet). Expire any of
586 * these that are no longer current, and pull the server
587 * lists from each of these known local master browsers.
588 * (nmbd_browsesync.c)
591 dmb_expire_and_sync_browser_lists(t);
594 * Check that there is a local master browser for our
595 * workgroup for all our broadcast subnets. If one
596 * is not found, start an election (which we ourselves
597 * may or may not participate in, depending on the
598 * setting of the 'local master' parameter.
602 check_master_browser_exists(t);
605 * If we are configured as a logon server, attempt to
606 * register the special NetBIOS names to become such
607 * (WORKGROUP<1c> name) on all broadcast subnets and
608 * with the WINS server (if used). If we are configured
609 * to become a domain master browser, attempt to register
610 * the special NetBIOS name (WORKGROUP<1b> name) to
612 * (nmbd_become_dmb.c)
618 * If we are a WINS server, do any timer dependent
619 * processing required.
620 * (nmbd_winsserver.c)
623 initiate_wins_processing(t);
626 * If we are a domain master browser, attempt to contact the
627 * WINS server to get a list of all known WORKGROUPS/DOMAINS.
628 * This will only work to a Samba WINS server.
629 * (nmbd_browsesync.c)
632 if (lp_enhanced_browsing())
633 collect_all_workgroup_names_from_wins_server(t);
636 * Go through the response record queue and time out or re-transmit
637 * and expired entries.
641 retransmit_or_expire_response_records(t);
644 * check to see if any remote browse sync child processes have completed
647 sync_check_completion();
650 * regularly sync with any other DMBs we know about
653 if (lp_enhanced_browsing())
656 /* check for new network interfaces */
658 reload_interfaces(t);
660 /* free up temp memory */
665 /**************************************************************************** **
666 Open the socket communication.
667 **************************************************************************** */
669 static bool open_sockets(bool isdaemon, int port)
671 struct sockaddr_storage ss;
672 const char *sock_addr = lp_socket_address();
675 * The sockets opened here will be used to receive broadcast
676 * packets *only*. Interface specific sockets are opened in
677 * make_subnet() in namedbsubnet.c. Thus we bind to the
678 * address "0.0.0.0". The parameter 'socket address' is
682 if (!interpret_string_addr(&ss, sock_addr,
683 AI_NUMERICHOST|AI_PASSIVE)) {
684 DEBUG(0,("open_sockets: unable to get socket address "
685 "from string %s", sock_addr));
688 if (ss.ss_family != AF_INET) {
689 DEBUG(0,("open_sockets: unable to use IPv6 socket"
696 ClientNMB = open_socket_in(SOCK_DGRAM, port,
703 if (ClientNMB == -1) {
707 ClientDGRAM = open_socket_in(SOCK_DGRAM, DGRAM_PORT,
711 if (ClientDGRAM == -1) {
712 if (ClientNMB != 0) {
718 /* we are never interested in SIGPIPE */
719 BlockSignals(True,SIGPIPE);
721 set_socket_options( ClientNMB, "SO_BROADCAST" );
722 set_socket_options( ClientDGRAM, "SO_BROADCAST" );
724 /* Ensure we're non-blocking. */
725 set_blocking( ClientNMB, False);
726 set_blocking( ClientDGRAM, False);
728 DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
732 /**************************************************************************** **
734 **************************************************************************** */
736 int main(int argc, const char *argv[])
738 static bool is_daemon;
739 static bool opt_interactive;
740 static bool Fork = true;
741 static bool no_process_group;
742 static bool log_stdout;
744 char *p_lmhosts = NULL;
750 OPT_NO_PROCESS_GROUP,
753 struct poptOption long_options[] = {
755 {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon(default)" },
756 {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)" },
757 {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools & etc)" },
758 {"no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
759 {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
760 {"hosts", 'H', POPT_ARG_STRING, &p_lmhosts, 0, "Load a netbios hosts file"},
761 {"port", 'p', POPT_ARG_INT, &global_nmb_port, 0, "Listen on the specified port" },
769 * Do this before any other talloc operation
771 talloc_enable_null_tracking();
772 frame = talloc_stackframe();
774 setup_logging(argv[0], DEBUG_DEFAULT_STDOUT);
778 global_nmb_port = NMB_PORT;
780 pc = poptGetContext("nmbd", argc, argv, long_options, 0);
781 while ((opt = poptGetNextOpt(pc)) != -1) {
786 case OPT_INTERACTIVE:
787 opt_interactive = true;
792 case OPT_NO_PROCESS_GROUP:
793 no_process_group = true;
799 d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
800 poptBadOption(pc, 0), poptStrerror(opt));
801 poptPrintUsage(pc, stderr, 0);
807 global_in_nmbd = true;
809 StartupTime = time(NULL);
811 sys_srandom(time(NULL) ^ sys_getpid());
813 if (!override_logfile) {
815 if (asprintf(&lfile, "%s/log.nmbd", get_dyn_LOGFILEBASE()) < 0) {
818 lp_set_logfile(lfile);
823 dump_core_setup("nmbd", lp_logfile());
825 /* POSIX demands that signals are inherited. If the invoking process has
826 * these signals masked, we will have problems, as we won't receive them. */
827 BlockSignals(False, SIGHUP);
828 BlockSignals(False, SIGUSR1);
829 BlockSignals(False, SIGTERM);
832 /* we are never interested in SIGFPE */
833 BlockSignals(True,SIGFPE);
836 /* We no longer use USR2... */
838 BlockSignals(True, SIGUSR2);
841 if ( opt_interactive ) {
846 if ( log_stdout && Fork ) {
847 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
852 setup_logging(argv[0], DEBUG_STDOUT);
854 setup_logging( argv[0], DEBUG_FILE);
859 DEBUG(0,("nmbd version %s started.\n", samba_version_string()));
860 DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
862 if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
863 DEBUG(0, ("error opening config file '%s'\n", get_dyn_CONFIGFILE()));
867 if (nmbd_messaging_context() == NULL) {
871 if ( !reload_nmbd_services(False) )
877 reload_nmbd_services( True );
879 if (strequal(lp_workgroup(),"*")) {
880 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
886 if (!is_daemon && !is_a_socket(0)) {
887 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
891 if (is_daemon && !opt_interactive) {
892 DEBUG( 2, ( "Becoming a daemon.\n" ) );
893 become_daemon(Fork, no_process_group, log_stdout);
898 * If we're interactive we want to set our own process group for
901 if (opt_interactive && !no_process_group)
902 setpgid( (pid_t)0, (pid_t)0 );
905 if (nmbd_messaging_context() == NULL) {
910 /* Setup the async dns. We do it here so it doesn't have all the other
911 stuff initialised and thus chewing memory and sockets */
912 if(lp_we_are_a_wins_server() && lp_dns_proxy()) {
913 start_async_dns(nmbd_messaging_context());
917 if (!directory_exist(lp_lockdir())) {
918 mkdir(lp_lockdir(), 0755);
921 pidfile_create("nmbd");
923 status = reinit_after_fork(nmbd_messaging_context(),
924 nmbd_event_context(),
927 if (!NT_STATUS_IS_OK(status)) {
928 DEBUG(0,("reinit_after_fork() failed\n"));
932 if (!nmbd_setup_sig_term_handler(nmbd_messaging_context()))
934 if (!nmbd_setup_sig_hup_handler(nmbd_messaging_context()))
937 /* get broadcast messages */
939 if (!serverid_register(procid_self(),
943 DEBUG(1, ("Could not register myself in serverid.tdb\n"));
947 messaging_register(nmbd_messaging_context(), NULL,
948 MSG_FORCE_ELECTION, nmbd_message_election);
950 /* Until winsrepl is done. */
951 messaging_register(nmbd_messaging_context(), NULL,
952 MSG_WINS_NEW_ENTRY, nmbd_wins_new_entry);
954 messaging_register(nmbd_messaging_context(), NULL,
955 MSG_SHUTDOWN, nmbd_terminate);
956 messaging_register(nmbd_messaging_context(), NULL,
957 MSG_SMB_CONF_UPDATED, msg_reload_nmbd_services);
958 messaging_register(nmbd_messaging_context(), NULL,
959 MSG_SEND_PACKET, msg_nmbd_send_packet);
963 DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port ) );
965 if ( !open_sockets( is_daemon, global_nmb_port ) ) {
966 kill_async_dns_child();
970 /* Determine all the IP addresses we have. */
973 /* Create an nmbd subnet record for each of the above. */
974 if( False == create_subnets() ) {
975 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
976 kill_async_dns_child();
980 /* Load in any static local names. */
982 set_dyn_LMHOSTSFILE(p_lmhosts);
984 load_lmhosts_file(get_dyn_LMHOSTSFILE());
985 DEBUG(3,("Loaded hosts file %s\n", get_dyn_LMHOSTSFILE()));
987 /* If we are acting as a WINS server, initialise data structures. */
988 if( !initialise_wins() ) {
989 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
990 kill_async_dns_child();
995 * Register nmbd primary workgroup and nmbd names on all
996 * the broadcast subnets, and on the WINS server (if specified).
997 * Also initiate the startup of our primary workgroup (start
998 * elections if we are setup as being able to be a local
1002 if( False == register_my_workgroup_and_names() ) {
1003 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
1004 kill_async_dns_child();
1008 if (!initialize_nmbd_proxy_logon()) {
1009 DEBUG(0,("ERROR: Failed setup nmbd_proxy_logon.\n"));
1010 kill_async_dns_child();
1014 if (!nmbd_init_packet_server()) {
1015 kill_async_dns_child();
1020 process(nmbd_messaging_context());
1022 kill_async_dns_child();