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/>.
27 int global_nmb_port
= -1;
29 extern bool rescan_listen_set
;
30 extern bool global_in_nmbd
;
32 extern bool override_logfile
;
34 /* have we found LanMan clients yet? */
35 bool found_lm_clients
= False
;
37 /* what server type are we currently */
39 time_t StartupTime
= 0;
41 struct event_context
*nmbd_event_context(void)
43 static struct event_context
*ctx
;
45 if (!ctx
&& !(ctx
= event_context_init(NULL
))) {
46 smb_panic("Could not init nmbd event context");
51 struct messaging_context
*nmbd_messaging_context(void)
53 static struct messaging_context
*ctx
;
56 ctx
= messaging_init(NULL
, server_id_self(),
57 nmbd_event_context());
60 DEBUG(0, ("Could not init nmbd messaging context.\n"));
65 /**************************************************************************** **
66 Handle a SIGTERM in band.
67 **************************************************************************** */
69 static void terminate(void)
71 DEBUG(0,("Got SIGTERM: going down...\n"));
73 /* Write out wins.dat file if samba is a WINS server */
74 wins_write_database(0,False
);
76 /* Remove all SELF registered names from WINS */
79 /* Announce all server entries as 0 time-to-live, 0 type. */
80 announce_my_servers_removed();
82 /* If there was an async dns child - kill it. */
83 kill_async_dns_child();
90 static void nmbd_sig_term_handler(struct tevent_context
*ev
,
91 struct tevent_signal
*se
,
100 static bool nmbd_setup_sig_term_handler(void)
102 struct tevent_signal
*se
;
104 se
= tevent_add_signal(nmbd_event_context(),
105 nmbd_event_context(),
107 nmbd_sig_term_handler
,
110 DEBUG(0,("failed to setup SIGTERM handler"));
117 static void msg_reload_nmbd_services(struct messaging_context
*msg
,
120 struct server_id server_id
,
123 static void nmbd_sig_hup_handler(struct tevent_context
*ev
,
124 struct tevent_signal
*se
,
130 DEBUG(0,("Got SIGHUP dumping debug info.\n"));
131 msg_reload_nmbd_services(nmbd_messaging_context(),
132 NULL
, MSG_SMB_CONF_UPDATED
,
133 procid_self(), NULL
);
136 static bool nmbd_setup_sig_hup_handler(void)
138 struct tevent_signal
*se
;
140 se
= tevent_add_signal(nmbd_event_context(),
141 nmbd_event_context(),
143 nmbd_sig_hup_handler
,
146 DEBUG(0,("failed to setup SIGHUP handler"));
153 /**************************************************************************** **
154 Handle a SHUTDOWN message from smbcontrol.
155 **************************************************************************** */
157 static void nmbd_terminate(struct messaging_context
*msg
,
160 struct server_id server_id
,
166 /**************************************************************************** **
167 Possibly continue after a fault.
168 **************************************************************************** */
170 static void fault_continue(void)
175 /**************************************************************************** **
176 Expire old names from the namelist and server list.
177 **************************************************************************** */
179 static void expire_names_and_servers(time_t t
)
181 static time_t lastrun
= 0;
185 if ( t
< (lastrun
+ 5) )
190 * Expire any timed out names on all the broadcast
191 * subnets and those registered with the WINS server.
192 * (nmbd_namelistdb.c)
198 * Go through all the broadcast subnets and for each
199 * workgroup known on that subnet remove any expired
200 * server names. If a workgroup has an empty serverlist
201 * and has itself timed out then remove the workgroup.
202 * (nmbd_workgroupdb.c)
205 expire_workgroups_and_servers(t
);
208 /************************************************************************** **
209 Reload the list of network interfaces.
210 Doesn't return until a network interface is up.
211 ************************************************************************** */
213 static void reload_interfaces(time_t t
)
217 bool print_waiting_msg
= true;
218 struct subnet_record
*subrec
;
220 if (t
&& ((t
- lastt
) < NMBD_INTERFACES_RELOAD
)) {
226 if (!interfaces_changed()) {
232 /* the list of probed interfaces has changed, we may need to add/remove
236 /* find any interfaces that need adding */
237 for (n
=iface_count() - 1; n
>= 0; n
--) {
238 char str
[INET6_ADDRSTRLEN
];
239 const struct interface
*iface
= get_interface(n
);
240 struct in_addr ip
, nmask
;
243 DEBUG(2,("reload_interfaces: failed to get interface %d\n", n
));
247 /* Ensure we're only dealing with IPv4 here. */
248 if (iface
->ip
.ss_family
!= AF_INET
) {
249 DEBUG(2,("reload_interfaces: "
250 "ignoring non IPv4 interface.\n"));
254 ip
= ((struct sockaddr_in
*)&iface
->ip
)->sin_addr
;
255 nmask
= ((struct sockaddr_in
*)&iface
->netmask
)->sin_addr
;
258 * We don't want to add a loopback interface, in case
259 * someone has added 127.0.0.1 for smbd, nmbd needs to
260 * ignore it here. JRA.
263 if (is_loopback_addr((struct sockaddr
*)&iface
->ip
)) {
264 DEBUG(2,("reload_interfaces: Ignoring loopback "
266 print_sockaddr(str
, sizeof(str
), &iface
->ip
) ));
270 for (subrec
=subnetlist
; subrec
; subrec
=subrec
->next
) {
271 if (ip_equal_v4(ip
, subrec
->myip
) &&
272 ip_equal_v4(nmask
, subrec
->mask_ip
)) {
278 /* it wasn't found! add it */
279 DEBUG(2,("Found new interface %s\n",
281 sizeof(str
), &iface
->ip
) ));
282 subrec
= make_normal_subnet(iface
);
284 register_my_workgroup_one_subnet(subrec
);
288 /* find any interfaces that need deleting */
289 for (subrec
=subnetlist
; subrec
; subrec
=subrec
->next
) {
290 for (n
=iface_count() - 1; n
>= 0; n
--) {
291 struct interface
*iface
= get_interface(n
);
292 struct in_addr ip
, nmask
;
296 /* Ensure we're only dealing with IPv4 here. */
297 if (iface
->ip
.ss_family
!= AF_INET
) {
298 DEBUG(2,("reload_interfaces: "
299 "ignoring non IPv4 interface.\n"));
302 ip
= ((struct sockaddr_in
*)&iface
->ip
)->sin_addr
;
303 nmask
= ((struct sockaddr_in
*)&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
, SIGNAL_CAST SIG_DFL
);
340 /* We only count IPv4, non-loopback interfaces here. */
341 while (iface_count_v4_nl() == 0) {
346 CatchSignal( SIGTERM
, SIGNAL_CAST 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
*)&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
;
444 p
->fd
= (p
->packet_type
== NMB_PACKET
) ?
445 subrec
->nmb_sock
: subrec
->dgram_sock
;
447 for (subrec
= FIRST_SUBNET
; subrec
!= NULL
;
448 subrec
= NEXT_SUBNET_EXCLUDING_UNICAST(subrec
)) {
449 if (ip_equal_v4(*local_ip
, subrec
->myip
)) {
450 p
->fd
= (p
->packet_type
== NMB_PACKET
) ?
451 subrec
->nmb_sock
: subrec
->dgram_sock
;
456 if (p
->packet_type
== DGRAM_PACKET
) {
458 p
->packet
.dgram
.header
.source_ip
.s_addr
= local_ip
->s_addr
;
459 p
->packet
.dgram
.header
.source_port
= 138;
465 /**************************************************************************** **
466 The main select loop.
467 **************************************************************************** */
469 static void process(void)
474 time_t t
= time(NULL
);
475 TALLOC_CTX
*frame
= talloc_stackframe();
478 * Check all broadcast subnets to see if
479 * we need to run an election on any of them.
483 run_election
= check_elections();
486 * Read incoming UDP packets.
490 if(listen_for_packets(run_election
)) {
496 * Process all incoming packets
497 * read above. This calls the success and
498 * failure functions registered when response
499 * packets arrrive, and also deals with request
500 * packets from other sources.
507 * Run any elections - initiate becoming
508 * a local master browser if we have won.
515 * Send out any broadcast announcements
516 * of our server names. This also announces
517 * the workgroup name if we are a local
519 * (nmbd_sendannounce.c)
522 announce_my_server_names(t
);
525 * Send out any LanMan broadcast announcements
526 * of our server names.
527 * (nmbd_sendannounce.c)
530 announce_my_lm_server_names(t
);
533 * If we are a local master browser, periodically
534 * announce ourselves to the domain master browser.
535 * This also deals with syncronising the domain master
536 * browser server lists with ourselves as a local
538 * (nmbd_sendannounce.c)
541 announce_myself_to_domain_master_browser(t
);
544 * Fullfill any remote announce requests.
545 * (nmbd_sendannounce.c)
551 * Fullfill any remote browse sync announce requests.
552 * (nmbd_sendannounce.c)
555 browse_sync_remote(t
);
558 * Scan the broadcast subnets, and WINS client
559 * namelists and refresh any that need refreshing.
566 * Scan the subnet namelists and server lists and
567 * expire thos that have timed out.
571 expire_names_and_servers(t
);
574 * Write out a snapshot of our current browse list into
575 * the browse.dat file. This is used by smbd to service
576 * incoming NetServerEnum calls - used to synchronise
577 * browse lists over subnets.
578 * (nmbd_serverlistdb.c)
581 write_browse_list(t
, False
);
584 * If we are a domain master browser, we have a list of
585 * local master browsers we should synchronise browse
586 * lists with (these are added by an incoming local
587 * master browser announcement packet). Expire any of
588 * these that are no longer current, and pull the server
589 * lists from each of these known local master browsers.
590 * (nmbd_browsesync.c)
593 dmb_expire_and_sync_browser_lists(t
);
596 * Check that there is a local master browser for our
597 * workgroup for all our broadcast subnets. If one
598 * is not found, start an election (which we ourselves
599 * may or may not participate in, depending on the
600 * setting of the 'local master' parameter.
604 check_master_browser_exists(t
);
607 * If we are configured as a logon server, attempt to
608 * register the special NetBIOS names to become such
609 * (WORKGROUP<1c> name) on all broadcast subnets and
610 * with the WINS server (if used). If we are configured
611 * to become a domain master browser, attempt to register
612 * the special NetBIOS name (WORKGROUP<1b> name) to
614 * (nmbd_become_dmb.c)
620 * If we are a WINS server, do any timer dependent
621 * processing required.
622 * (nmbd_winsserver.c)
625 initiate_wins_processing(t
);
628 * If we are a domain master browser, attempt to contact the
629 * WINS server to get a list of all known WORKGROUPS/DOMAINS.
630 * This will only work to a Samba WINS server.
631 * (nmbd_browsesync.c)
634 if (lp_enhanced_browsing())
635 collect_all_workgroup_names_from_wins_server(t
);
638 * Go through the response record queue and time out or re-transmit
639 * and expired entries.
643 retransmit_or_expire_response_records(t
);
646 * check to see if any remote browse sync child processes have completed
649 sync_check_completion();
652 * regularly sync with any other DMBs we know about
655 if (lp_enhanced_browsing())
659 * clear the unexpected packet queue
664 /* check for new network interfaces */
666 reload_interfaces(t
);
668 /* free up temp memory */
673 /**************************************************************************** **
674 Open the socket communication.
675 **************************************************************************** */
677 static bool open_sockets(bool isdaemon
, int port
)
679 struct sockaddr_storage ss
;
680 const char *sock_addr
= lp_socket_address();
683 * The sockets opened here will be used to receive broadcast
684 * packets *only*. Interface specific sockets are opened in
685 * make_subnet() in namedbsubnet.c. Thus we bind to the
686 * address "0.0.0.0". The parameter 'socket address' is
690 if (!interpret_string_addr(&ss
, sock_addr
,
691 AI_NUMERICHOST
|AI_PASSIVE
)) {
692 DEBUG(0,("open_sockets: unable to get socket address "
693 "from string %s", sock_addr
));
696 if (ss
.ss_family
!= AF_INET
) {
697 DEBUG(0,("open_sockets: unable to use IPv6 socket"
704 ClientNMB
= open_socket_in(SOCK_DGRAM
, port
,
711 if (ClientNMB
== -1) {
715 ClientDGRAM
= open_socket_in(SOCK_DGRAM
, DGRAM_PORT
,
719 if (ClientDGRAM
== -1) {
720 if (ClientNMB
!= 0) {
726 /* we are never interested in SIGPIPE */
727 BlockSignals(True
,SIGPIPE
);
729 set_socket_options( ClientNMB
, "SO_BROADCAST" );
730 set_socket_options( ClientDGRAM
, "SO_BROADCAST" );
732 /* Ensure we're non-blocking. */
733 set_blocking( ClientNMB
, False
);
734 set_blocking( ClientDGRAM
, False
);
736 DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
740 /**************************************************************************** **
742 **************************************************************************** */
744 int main(int argc
, const char *argv
[])
746 static bool is_daemon
;
747 static bool opt_interactive
;
748 static bool Fork
= true;
749 static bool no_process_group
;
750 static bool log_stdout
;
752 char *p_lmhosts
= NULL
;
758 OPT_NO_PROCESS_GROUP
,
761 struct poptOption long_options
[] = {
763 {"daemon", 'D', POPT_ARG_NONE
, NULL
, OPT_DAEMON
, "Become a daemon(default)" },
764 {"interactive", 'i', POPT_ARG_NONE
, NULL
, OPT_INTERACTIVE
, "Run interactive (not a daemon)" },
765 {"foreground", 'F', POPT_ARG_NONE
, NULL
, OPT_FORK
, "Run daemon in foreground (for daemontools & etc)" },
766 {"no-process-group", 0, POPT_ARG_NONE
, NULL
, OPT_NO_PROCESS_GROUP
, "Don't create a new process group" },
767 {"log-stdout", 'S', POPT_ARG_NONE
, NULL
, OPT_LOG_STDOUT
, "Log to stdout" },
768 {"hosts", 'H', POPT_ARG_STRING
, &p_lmhosts
, 'H', "Load a netbios hosts file"},
769 {"port", 'p', POPT_ARG_INT
, &global_nmb_port
, NMB_PORT
, "Listen on the specified port" },
773 TALLOC_CTX
*frame
= talloc_stackframe(); /* Setup tos. */
777 global_nmb_port
= NMB_PORT
;
779 pc
= poptGetContext("nmbd", argc
, argv
, long_options
, 0);
780 while ((opt
= poptGetNextOpt(pc
)) != -1) {
785 case OPT_INTERACTIVE
:
786 opt_interactive
= true;
791 case OPT_NO_PROCESS_GROUP
:
792 no_process_group
= true;
798 d_fprintf(stderr
, "\nInvalid option %s: %s\n\n",
799 poptBadOption(pc
, 0), poptStrerror(opt
));
800 poptPrintUsage(pc
, stderr
, 0);
806 global_in_nmbd
= true;
808 StartupTime
= time(NULL
);
810 sys_srandom(time(NULL
) ^ sys_getpid());
812 if (!override_logfile
) {
814 if (asprintf(&lfile
, "%s/log.nmbd", get_dyn_LOGFILEBASE()) < 0) {
817 lp_set_logfile(lfile
);
821 fault_setup((void (*)(void *))fault_continue
);
822 dump_core_setup("nmbd");
824 /* POSIX demands that signals are inherited. If the invoking process has
825 * these signals masked, we will have problems, as we won't receive them. */
826 BlockSignals(False
, SIGHUP
);
827 BlockSignals(False
, SIGUSR1
);
828 BlockSignals(False
, SIGTERM
);
831 /* we are never interested in SIGFPE */
832 BlockSignals(True
,SIGFPE
);
835 /* We no longer use USR2... */
837 BlockSignals(True
, SIGUSR2
);
840 if ( opt_interactive
) {
845 if ( log_stdout
&& Fork
) {
846 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
850 setup_logging( argv
[0], log_stdout
);
854 DEBUG(0,("nmbd version %s started.\n", samba_version_string()));
855 DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE
));
857 if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
858 DEBUG(0, ("error opening config file\n"));
862 if (nmbd_messaging_context() == NULL
) {
866 if ( !reload_nmbd_services(False
) )
872 reload_nmbd_services( True
);
874 if (strequal(lp_workgroup(),"*")) {
875 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
881 if (!is_daemon
&& !is_a_socket(0)) {
882 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
886 if (is_daemon
&& !opt_interactive
) {
887 DEBUG( 2, ( "Becoming a daemon.\n" ) );
888 become_daemon(Fork
, no_process_group
);
893 * If we're interactive we want to set our own process group for
896 if (opt_interactive
&& !no_process_group
)
897 setpgid( (pid_t
)0, (pid_t
)0 );
900 if (nmbd_messaging_context() == NULL
) {
905 /* Setup the async dns. We do it here so it doesn't have all the other
906 stuff initialised and thus chewing memory and sockets */
907 if(lp_we_are_a_wins_server() && lp_dns_proxy()) {
912 if (!directory_exist(lp_lockdir())) {
913 mkdir(lp_lockdir(), 0755);
916 pidfile_create("nmbd");
918 if (!NT_STATUS_IS_OK(reinit_after_fork(nmbd_messaging_context(),
919 nmbd_event_context(), false))) {
920 DEBUG(0,("reinit_after_fork() failed\n"));
924 if (!nmbd_setup_sig_term_handler())
926 if (!nmbd_setup_sig_hup_handler())
929 /* get broadcast messages */
930 claim_connection(NULL
,"",FLAG_MSG_GENERAL
|FLAG_MSG_DBWRAP
);
932 messaging_register(nmbd_messaging_context(), NULL
,
933 MSG_FORCE_ELECTION
, nmbd_message_election
);
935 /* Until winsrepl is done. */
936 messaging_register(nmbd_messaging_context(), NULL
,
937 MSG_WINS_NEW_ENTRY
, nmbd_wins_new_entry
);
939 messaging_register(nmbd_messaging_context(), NULL
,
940 MSG_SHUTDOWN
, nmbd_terminate
);
941 messaging_register(nmbd_messaging_context(), NULL
,
942 MSG_SMB_CONF_UPDATED
, msg_reload_nmbd_services
);
943 messaging_register(nmbd_messaging_context(), NULL
,
944 MSG_SEND_PACKET
, msg_nmbd_send_packet
);
948 DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port
) );
950 if ( !open_sockets( is_daemon
, global_nmb_port
) ) {
951 kill_async_dns_child();
955 /* Determine all the IP addresses we have. */
958 /* Create an nmbd subnet record for each of the above. */
959 if( False
== create_subnets() ) {
960 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
961 kill_async_dns_child();
965 /* Load in any static local names. */
967 set_dyn_LMHOSTSFILE(p_lmhosts
);
969 load_lmhosts_file(get_dyn_LMHOSTSFILE());
970 DEBUG(3,("Loaded hosts file %s\n", get_dyn_LMHOSTSFILE()));
972 /* If we are acting as a WINS server, initialise data structures. */
973 if( !initialise_wins() ) {
974 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
975 kill_async_dns_child();
980 * Register nmbd primary workgroup and nmbd names on all
981 * the broadcast subnets, and on the WINS server (if specified).
982 * Also initiate the startup of our primary workgroup (start
983 * elections if we are setup as being able to be a local
987 if( False
== register_my_workgroup_and_names() ) {
988 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
989 kill_async_dns_child();
993 if (!initialize_nmbd_proxy_logon()) {
994 DEBUG(0,("ERROR: Failed setup nmbd_proxy_logon.\n"));
995 kill_async_dns_child();
1004 kill_async_dns_child();