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/>.
24 #include "popt_common.h"
25 #include "librpc/gen_ndr/messaging.h"
26 #include "nmbd/nmbd.h"
30 int global_nmb_port = -1;
32 extern bool rescan_listen_set;
33 extern bool global_in_nmbd;
35 extern bool override_logfile;
37 /* have we found LanMan clients yet? */
38 bool found_lm_clients = False;
40 /* what server type are we currently */
42 time_t StartupTime = 0;
44 struct event_context *nmbd_event_context(void)
46 return server_event_context();
49 struct messaging_context *nmbd_messaging_context(void)
51 struct messaging_context *msg_ctx = server_messaging_context();
52 if (likely(msg_ctx != NULL)) {
55 smb_panic("Could not init nmbd's messaging context.\n");
59 /**************************************************************************** **
60 Handle a SIGTERM in band.
61 **************************************************************************** */
63 static void terminate(void)
65 DEBUG(0,("Got SIGTERM: going down...\n"));
67 /* Write out wins.dat file if samba is a WINS server */
68 wins_write_database(0,False);
70 /* Remove all SELF registered names from WINS */
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();
80 serverid_deregister(procid_self());
87 static void nmbd_sig_term_handler(struct tevent_context *ev,
88 struct tevent_signal *se,
97 static bool nmbd_setup_sig_term_handler(void)
99 struct tevent_signal *se;
101 se = tevent_add_signal(nmbd_event_context(),
102 nmbd_event_context(),
104 nmbd_sig_term_handler,
107 DEBUG(0,("failed to setup SIGTERM handler"));
114 static void msg_reload_nmbd_services(struct messaging_context *msg,
117 struct server_id server_id,
120 static void nmbd_sig_hup_handler(struct tevent_context *ev,
121 struct tevent_signal *se,
127 DEBUG(0,("Got SIGHUP dumping debug info.\n"));
128 msg_reload_nmbd_services(nmbd_messaging_context(),
129 NULL, MSG_SMB_CONF_UPDATED,
130 procid_self(), NULL);
133 static bool nmbd_setup_sig_hup_handler(void)
135 struct tevent_signal *se;
137 se = tevent_add_signal(nmbd_event_context(),
138 nmbd_event_context(),
140 nmbd_sig_hup_handler,
143 DEBUG(0,("failed to setup SIGHUP handler"));
150 /**************************************************************************** **
151 Handle a SHUTDOWN message from smbcontrol.
152 **************************************************************************** */
154 static void nmbd_terminate(struct messaging_context *msg,
157 struct server_id server_id,
163 /**************************************************************************** **
164 Possibly continue after a fault.
165 **************************************************************************** */
167 static void fault_continue(void)
172 /**************************************************************************** **
173 Expire old names from the namelist and server list.
174 **************************************************************************** */
176 static void expire_names_and_servers(time_t t)
178 static time_t lastrun = 0;
182 if ( t < (lastrun + 5) )
187 * Expire any timed out names on all the broadcast
188 * subnets and those registered with the WINS server.
189 * (nmbd_namelistdb.c)
195 * Go through all the broadcast subnets and for each
196 * workgroup known on that subnet remove any expired
197 * server names. If a workgroup has an empty serverlist
198 * and has itself timed out then remove the workgroup.
199 * (nmbd_workgroupdb.c)
202 expire_workgroups_and_servers(t);
205 /************************************************************************** **
206 Reload the list of network interfaces.
207 Doesn't return until a network interface is up.
208 ************************************************************************** */
210 static void reload_interfaces(time_t t)
214 bool print_waiting_msg = true;
215 struct subnet_record *subrec;
217 if (t && ((t - lastt) < NMBD_INTERFACES_RELOAD)) {
223 if (!interfaces_changed()) {
229 /* the list of probed interfaces has changed, we may need to add/remove
233 /* find any interfaces that need adding */
234 for (n=iface_count() - 1; n >= 0; n--) {
235 char str[INET6_ADDRSTRLEN];
236 const struct interface *iface = get_interface(n);
237 struct in_addr ip, nmask;
240 DEBUG(2,("reload_interfaces: failed to get interface %d\n", n));
244 /* Ensure we're only dealing with IPv4 here. */
245 if (iface->ip.ss_family != AF_INET) {
246 DEBUG(2,("reload_interfaces: "
247 "ignoring non IPv4 interface.\n"));
251 ip = ((struct sockaddr_in *)(void *)&iface->ip)->sin_addr;
252 nmask = ((struct sockaddr_in *)(void *)
253 &iface->netmask)->sin_addr;
256 * We don't want to add a loopback interface, in case
257 * someone has added 127.0.0.1 for smbd, nmbd needs to
258 * ignore it here. JRA.
261 if (is_loopback_addr((struct sockaddr *)(void *)&iface->ip)) {
262 DEBUG(2,("reload_interfaces: Ignoring loopback "
264 print_sockaddr(str, sizeof(str), &iface->ip) ));
268 for (subrec=subnetlist; subrec; subrec=subrec->next) {
269 if (ip_equal_v4(ip, subrec->myip) &&
270 ip_equal_v4(nmask, subrec->mask_ip)) {
276 /* it wasn't found! add it */
277 DEBUG(2,("Found new interface %s\n",
279 sizeof(str), &iface->ip) ));
280 subrec = make_normal_subnet(iface);
282 register_my_workgroup_one_subnet(subrec);
286 /* find any interfaces that need deleting */
287 for (subrec=subnetlist; subrec; subrec=subrec->next) {
288 for (n=iface_count() - 1; n >= 0; n--) {
289 struct interface *iface = get_interface(n);
290 struct in_addr ip, nmask;
294 /* Ensure we're only dealing with IPv4 here. */
295 if (iface->ip.ss_family != AF_INET) {
296 DEBUG(2,("reload_interfaces: "
297 "ignoring non IPv4 interface.\n"));
300 ip = ((struct sockaddr_in *)(void *)
301 &iface->ip)->sin_addr;
302 nmask = ((struct sockaddr_in *)(void *)
303 &iface->netmask)->sin_addr;
304 if (ip_equal_v4(ip, subrec->myip) &&
305 ip_equal_v4(nmask, subrec->mask_ip)) {
310 /* oops, an interface has disapeared. This is
311 tricky, we don't dare actually free the
312 interface as it could be being used, so
313 instead we just wear the memory leak and
314 remove it from the list of interfaces without
316 DEBUG(2,("Deleting dead interface %s\n",
317 inet_ntoa(subrec->myip)));
318 close_subnet(subrec);
322 rescan_listen_set = True;
324 /* We need to wait if there are no subnets... */
325 if (FIRST_SUBNET == NULL) {
326 void (*saved_handler)(int);
328 if (print_waiting_msg) {
329 DEBUG(0,("reload_interfaces: "
330 "No subnets to listen to. Waiting..\n"));
331 print_waiting_msg = false;
335 * Whilst we're waiting for an interface, allow SIGTERM to
338 saved_handler = CatchSignal(SIGTERM, SIG_DFL);
340 /* We only count IPv4, non-loopback interfaces here. */
341 while (iface_count_v4_nl() == 0) {
346 CatchSignal(SIGTERM, saved_handler);
349 * We got an interface, go back to blocking term.
356 /**************************************************************************** **
357 Reload the services file.
358 **************************************************************************** */
360 static bool reload_nmbd_services(bool test)
364 set_remote_machine_name("nmbd", False);
367 const char *fname = lp_configfile();
368 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
369 set_dyn_CONFIGFILE(fname);
374 if ( test && !lp_file_list_changed() )
377 ret = lp_load(get_dyn_CONFIGFILE(), True , False, False, True);
379 /* perhaps the config filename is now set */
381 DEBUG( 3, ( "services not loaded\n" ) );
382 reload_nmbd_services( True );
388 /**************************************************************************** **
389 * React on 'smbcontrol nmbd reload-config' in the same way as to SIGHUP
390 **************************************************************************** */
392 static void msg_reload_nmbd_services(struct messaging_context *msg,
395 struct server_id server_id,
398 write_browse_list( 0, True );
399 dump_all_namelists();
400 reload_nmbd_services( True );
402 reload_interfaces(0);
405 static void msg_nmbd_send_packet(struct messaging_context *msg,
408 struct server_id src,
411 struct packet_struct *p = (struct packet_struct *)data->data;
412 struct subnet_record *subrec;
413 struct sockaddr_storage ss;
414 const struct sockaddr_storage *pss;
415 const struct in_addr *local_ip;
417 DEBUG(10, ("Received send_packet from %u\n", (unsigned int)procid_to_pid(&src)));
419 if (data->length != sizeof(struct packet_struct)) {
420 DEBUG(2, ("Discarding invalid packet length from %u\n",
421 (unsigned int)procid_to_pid(&src)));
425 if ((p->packet_type != NMB_PACKET) &&
426 (p->packet_type != DGRAM_PACKET)) {
427 DEBUG(2, ("Discarding invalid packet type from %u: %d\n",
428 (unsigned int)procid_to_pid(&src), p->packet_type));
432 in_addr_to_sockaddr_storage(&ss, p->ip);
433 pss = iface_ip((struct sockaddr *)(void *)&ss);
436 DEBUG(2, ("Could not find ip for packet from %u\n",
437 (unsigned int)procid_to_pid(&src)));
441 local_ip = &((const struct sockaddr_in *)pss)->sin_addr;
442 subrec = FIRST_SUBNET;
445 p->send_fd = (p->packet_type == NMB_PACKET) ?
446 subrec->nmb_sock : subrec->dgram_sock;
448 for (subrec = FIRST_SUBNET; subrec != NULL;
449 subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
450 if (ip_equal_v4(*local_ip, subrec->myip)) {
451 p->send_fd = (p->packet_type == NMB_PACKET) ?
452 subrec->nmb_sock : subrec->dgram_sock;
457 if (p->packet_type == DGRAM_PACKET) {
459 p->packet.dgram.header.source_ip.s_addr = local_ip->s_addr;
460 p->packet.dgram.header.source_port = 138;
466 /**************************************************************************** **
467 The main select loop.
468 **************************************************************************** */
470 static void process(void)
475 time_t t = time(NULL);
476 TALLOC_CTX *frame = talloc_stackframe();
479 * Check all broadcast subnets to see if
480 * we need to run an election on any of them.
484 run_election = check_elections();
487 * Read incoming UDP packets.
491 if(listen_for_packets(run_election)) {
497 * Process all incoming packets
498 * read above. This calls the success and
499 * failure functions registered when response
500 * packets arrrive, and also deals with request
501 * packets from other sources.
508 * Run any elections - initiate becoming
509 * a local master browser if we have won.
516 * Send out any broadcast announcements
517 * of our server names. This also announces
518 * the workgroup name if we are a local
520 * (nmbd_sendannounce.c)
523 announce_my_server_names(t);
526 * Send out any LanMan broadcast announcements
527 * of our server names.
528 * (nmbd_sendannounce.c)
531 announce_my_lm_server_names(t);
534 * If we are a local master browser, periodically
535 * announce ourselves to the domain master browser.
536 * This also deals with syncronising the domain master
537 * browser server lists with ourselves as a local
539 * (nmbd_sendannounce.c)
542 announce_myself_to_domain_master_browser(t);
545 * Fullfill any remote announce requests.
546 * (nmbd_sendannounce.c)
552 * Fullfill any remote browse sync announce requests.
553 * (nmbd_sendannounce.c)
556 browse_sync_remote(t);
559 * Scan the broadcast subnets, and WINS client
560 * namelists and refresh any that need refreshing.
567 * Scan the subnet namelists and server lists and
568 * expire thos that have timed out.
572 expire_names_and_servers(t);
575 * Write out a snapshot of our current browse list into
576 * the browse.dat file. This is used by smbd to service
577 * incoming NetServerEnum calls - used to synchronise
578 * browse lists over subnets.
579 * (nmbd_serverlistdb.c)
582 write_browse_list(t, False);
585 * If we are a domain master browser, we have a list of
586 * local master browsers we should synchronise browse
587 * lists with (these are added by an incoming local
588 * master browser announcement packet). Expire any of
589 * these that are no longer current, and pull the server
590 * lists from each of these known local master browsers.
591 * (nmbd_browsesync.c)
594 dmb_expire_and_sync_browser_lists(t);
597 * Check that there is a local master browser for our
598 * workgroup for all our broadcast subnets. If one
599 * is not found, start an election (which we ourselves
600 * may or may not participate in, depending on the
601 * setting of the 'local master' parameter.
605 check_master_browser_exists(t);
608 * If we are configured as a logon server, attempt to
609 * register the special NetBIOS names to become such
610 * (WORKGROUP<1c> name) on all broadcast subnets and
611 * with the WINS server (if used). If we are configured
612 * to become a domain master browser, attempt to register
613 * the special NetBIOS name (WORKGROUP<1b> name) to
615 * (nmbd_become_dmb.c)
621 * If we are a WINS server, do any timer dependent
622 * processing required.
623 * (nmbd_winsserver.c)
626 initiate_wins_processing(t);
629 * If we are a domain master browser, attempt to contact the
630 * WINS server to get a list of all known WORKGROUPS/DOMAINS.
631 * This will only work to a Samba WINS server.
632 * (nmbd_browsesync.c)
635 if (lp_enhanced_browsing())
636 collect_all_workgroup_names_from_wins_server(t);
639 * Go through the response record queue and time out or re-transmit
640 * and expired entries.
644 retransmit_or_expire_response_records(t);
647 * check to see if any remote browse sync child processes have completed
650 sync_check_completion();
653 * regularly sync with any other DMBs we know about
656 if (lp_enhanced_browsing())
659 /* check for new network interfaces */
661 reload_interfaces(t);
663 /* free up temp memory */
668 /**************************************************************************** **
669 Open the socket communication.
670 **************************************************************************** */
672 static bool open_sockets(bool isdaemon, int port)
674 struct sockaddr_storage ss;
675 const char *sock_addr = lp_socket_address();
678 * The sockets opened here will be used to receive broadcast
679 * packets *only*. Interface specific sockets are opened in
680 * make_subnet() in namedbsubnet.c. Thus we bind to the
681 * address "0.0.0.0". The parameter 'socket address' is
685 if (!interpret_string_addr(&ss, sock_addr,
686 AI_NUMERICHOST|AI_PASSIVE)) {
687 DEBUG(0,("open_sockets: unable to get socket address "
688 "from string %s", sock_addr));
691 if (ss.ss_family != AF_INET) {
692 DEBUG(0,("open_sockets: unable to use IPv6 socket"
699 ClientNMB = open_socket_in(SOCK_DGRAM, port,
706 if (ClientNMB == -1) {
710 ClientDGRAM = open_socket_in(SOCK_DGRAM, DGRAM_PORT,
714 if (ClientDGRAM == -1) {
715 if (ClientNMB != 0) {
721 /* we are never interested in SIGPIPE */
722 BlockSignals(True,SIGPIPE);
724 set_socket_options( ClientNMB, "SO_BROADCAST" );
725 set_socket_options( ClientDGRAM, "SO_BROADCAST" );
727 /* Ensure we're non-blocking. */
728 set_blocking( ClientNMB, False);
729 set_blocking( ClientDGRAM, False);
731 DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
735 /**************************************************************************** **
737 **************************************************************************** */
739 int main(int argc, const char *argv[])
741 static bool is_daemon;
742 static bool opt_interactive;
743 static bool Fork = true;
744 static bool no_process_group;
745 static bool log_stdout;
747 char *p_lmhosts = NULL;
753 OPT_NO_PROCESS_GROUP,
756 struct poptOption long_options[] = {
758 {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon(default)" },
759 {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)" },
760 {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools & etc)" },
761 {"no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
762 {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
763 {"hosts", 'H', POPT_ARG_STRING, &p_lmhosts, 0, "Load a netbios hosts file"},
764 {"port", 'p', POPT_ARG_INT, &global_nmb_port, 0, "Listen on the specified port" },
772 * Do this before any other talloc operation
774 talloc_enable_null_tracking();
775 frame = talloc_stackframe();
779 global_nmb_port = NMB_PORT;
781 pc = poptGetContext("nmbd", argc, argv, long_options, 0);
782 while ((opt = poptGetNextOpt(pc)) != -1) {
787 case OPT_INTERACTIVE:
788 opt_interactive = true;
793 case OPT_NO_PROCESS_GROUP:
794 no_process_group = true;
800 d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
801 poptBadOption(pc, 0), poptStrerror(opt));
802 poptPrintUsage(pc, stderr, 0);
808 global_in_nmbd = true;
810 StartupTime = time(NULL);
812 sys_srandom(time(NULL) ^ sys_getpid());
814 if (!override_logfile) {
816 if (asprintf(&lfile, "%s/log.nmbd", get_dyn_LOGFILEBASE()) < 0) {
819 lp_set_logfile(lfile);
823 fault_setup((void (*)(void *))fault_continue );
824 dump_core_setup("nmbd");
826 /* POSIX demands that signals are inherited. If the invoking process has
827 * these signals masked, we will have problems, as we won't receive them. */
828 BlockSignals(False, SIGHUP);
829 BlockSignals(False, SIGUSR1);
830 BlockSignals(False, SIGTERM);
833 /* we are never interested in SIGFPE */
834 BlockSignals(True,SIGFPE);
837 /* We no longer use USR2... */
839 BlockSignals(True, SIGUSR2);
842 if ( opt_interactive ) {
847 if ( log_stdout && Fork ) {
848 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\n"));
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()) {
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(),
925 procid_self(), false);
927 if (!NT_STATUS_IS_OK(status)) {
928 DEBUG(0,("reinit_after_fork() failed\n"));
932 if (!nmbd_setup_sig_term_handler())
934 if (!nmbd_setup_sig_hup_handler())
937 /* get broadcast messages */
939 if (!serverid_register(procid_self(),
940 FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP)) {
941 DEBUG(1, ("Could not register myself in serverid.tdb\n"));
945 messaging_register(nmbd_messaging_context(), NULL,
946 MSG_FORCE_ELECTION, nmbd_message_election);
948 /* Until winsrepl is done. */
949 messaging_register(nmbd_messaging_context(), NULL,
950 MSG_WINS_NEW_ENTRY, nmbd_wins_new_entry);
952 messaging_register(nmbd_messaging_context(), NULL,
953 MSG_SHUTDOWN, nmbd_terminate);
954 messaging_register(nmbd_messaging_context(), NULL,
955 MSG_SMB_CONF_UPDATED, msg_reload_nmbd_services);
956 messaging_register(nmbd_messaging_context(), NULL,
957 MSG_SEND_PACKET, msg_nmbd_send_packet);
961 DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port ) );
963 if ( !open_sockets( is_daemon, global_nmb_port ) ) {
964 kill_async_dns_child();
968 /* Determine all the IP addresses we have. */
971 /* Create an nmbd subnet record for each of the above. */
972 if( False == create_subnets() ) {
973 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
974 kill_async_dns_child();
978 /* Load in any static local names. */
980 set_dyn_LMHOSTSFILE(p_lmhosts);
982 load_lmhosts_file(get_dyn_LMHOSTSFILE());
983 DEBUG(3,("Loaded hosts file %s\n", get_dyn_LMHOSTSFILE()));
985 /* If we are acting as a WINS server, initialise data structures. */
986 if( !initialise_wins() ) {
987 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
988 kill_async_dns_child();
993 * Register nmbd primary workgroup and nmbd names on all
994 * the broadcast subnets, and on the WINS server (if specified).
995 * Also initiate the startup of our primary workgroup (start
996 * elections if we are setup as being able to be a local
1000 if( False == register_my_workgroup_and_names() ) {
1001 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
1002 kill_async_dns_child();
1006 if (!initialize_nmbd_proxy_logon()) {
1007 DEBUG(0,("ERROR: Failed setup nmbd_proxy_logon.\n"));
1008 kill_async_dns_child();
1012 if (!nmbd_init_packet_server()) {
1013 kill_async_dns_child();
1020 kill_async_dns_child();