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();
92 static void nmbd_sig_term_handler(struct tevent_context
*ev
,
93 struct tevent_signal
*se
,
102 static bool nmbd_setup_sig_term_handler(void)
104 struct tevent_signal
*se
;
106 se
= tevent_add_signal(nmbd_event_context(),
107 nmbd_event_context(),
109 nmbd_sig_term_handler
,
112 DEBUG(0,("failed to setup SIGTERM handler"));
119 static void msg_reload_nmbd_services(struct messaging_context
*msg
,
122 struct server_id server_id
,
125 static void nmbd_sig_hup_handler(struct tevent_context
*ev
,
126 struct tevent_signal
*se
,
132 DEBUG(0,("Got SIGHUP dumping debug info.\n"));
133 msg_reload_nmbd_services(nmbd_messaging_context(),
134 NULL
, MSG_SMB_CONF_UPDATED
,
135 procid_self(), NULL
);
138 static bool nmbd_setup_sig_hup_handler(void)
140 struct tevent_signal
*se
;
142 se
= tevent_add_signal(nmbd_event_context(),
143 nmbd_event_context(),
145 nmbd_sig_hup_handler
,
148 DEBUG(0,("failed to setup SIGHUP handler"));
155 /**************************************************************************** **
156 Handle a SHUTDOWN message from smbcontrol.
157 **************************************************************************** */
159 static void nmbd_terminate(struct messaging_context
*msg
,
162 struct server_id server_id
,
168 /**************************************************************************** **
169 Possibly continue after a fault.
170 **************************************************************************** */
172 static void fault_continue(void)
177 /**************************************************************************** **
178 Expire old names from the namelist and server list.
179 **************************************************************************** */
181 static void expire_names_and_servers(time_t t
)
183 static time_t lastrun
= 0;
187 if ( t
< (lastrun
+ 5) )
192 * Expire any timed out names on all the broadcast
193 * subnets and those registered with the WINS server.
194 * (nmbd_namelistdb.c)
200 * Go through all the broadcast subnets and for each
201 * workgroup known on that subnet remove any expired
202 * server names. If a workgroup has an empty serverlist
203 * and has itself timed out then remove the workgroup.
204 * (nmbd_workgroupdb.c)
207 expire_workgroups_and_servers(t
);
210 /************************************************************************** **
211 Reload the list of network interfaces.
212 Doesn't return until a network interface is up.
213 ************************************************************************** */
215 static void reload_interfaces(time_t t
)
219 bool print_waiting_msg
= true;
220 struct subnet_record
*subrec
;
222 if (t
&& ((t
- lastt
) < NMBD_INTERFACES_RELOAD
)) {
228 if (!interfaces_changed()) {
234 /* the list of probed interfaces has changed, we may need to add/remove
238 /* find any interfaces that need adding */
239 for (n
=iface_count() - 1; n
>= 0; n
--) {
240 char str
[INET6_ADDRSTRLEN
];
241 const struct interface
*iface
= get_interface(n
);
242 struct in_addr ip
, nmask
;
245 DEBUG(2,("reload_interfaces: failed to get interface %d\n", n
));
249 /* Ensure we're only dealing with IPv4 here. */
250 if (iface
->ip
.ss_family
!= AF_INET
) {
251 DEBUG(2,("reload_interfaces: "
252 "ignoring non IPv4 interface.\n"));
256 ip
= ((struct sockaddr_in
*)&iface
->ip
)->sin_addr
;
257 nmask
= ((struct sockaddr_in
*)&iface
->netmask
)->sin_addr
;
260 * We don't want to add a loopback interface, in case
261 * someone has added 127.0.0.1 for smbd, nmbd needs to
262 * ignore it here. JRA.
265 if (is_loopback_addr((struct sockaddr
*)&iface
->ip
)) {
266 DEBUG(2,("reload_interfaces: Ignoring loopback "
268 print_sockaddr(str
, sizeof(str
), &iface
->ip
) ));
272 for (subrec
=subnetlist
; subrec
; subrec
=subrec
->next
) {
273 if (ip_equal_v4(ip
, subrec
->myip
) &&
274 ip_equal_v4(nmask
, subrec
->mask_ip
)) {
280 /* it wasn't found! add it */
281 DEBUG(2,("Found new interface %s\n",
283 sizeof(str
), &iface
->ip
) ));
284 subrec
= make_normal_subnet(iface
);
286 register_my_workgroup_one_subnet(subrec
);
290 /* find any interfaces that need deleting */
291 for (subrec
=subnetlist
; subrec
; subrec
=subrec
->next
) {
292 for (n
=iface_count() - 1; n
>= 0; n
--) {
293 struct interface
*iface
= get_interface(n
);
294 struct in_addr ip
, nmask
;
298 /* Ensure we're only dealing with IPv4 here. */
299 if (iface
->ip
.ss_family
!= AF_INET
) {
300 DEBUG(2,("reload_interfaces: "
301 "ignoring non IPv4 interface.\n"));
304 ip
= ((struct sockaddr_in
*)&iface
->ip
)->sin_addr
;
305 nmask
= ((struct sockaddr_in
*)&iface
->netmask
)->sin_addr
;
306 if (ip_equal_v4(ip
, subrec
->myip
) &&
307 ip_equal_v4(nmask
, subrec
->mask_ip
)) {
312 /* oops, an interface has disapeared. This is
313 tricky, we don't dare actually free the
314 interface as it could be being used, so
315 instead we just wear the memory leak and
316 remove it from the list of interfaces without
318 DEBUG(2,("Deleting dead interface %s\n",
319 inet_ntoa(subrec
->myip
)));
320 close_subnet(subrec
);
324 rescan_listen_set
= True
;
326 /* We need to wait if there are no subnets... */
327 if (FIRST_SUBNET
== NULL
) {
328 void (*saved_handler
)(int);
330 if (print_waiting_msg
) {
331 DEBUG(0,("reload_interfaces: "
332 "No subnets to listen to. Waiting..\n"));
333 print_waiting_msg
= false;
337 * Whilst we're waiting for an interface, allow SIGTERM to
340 saved_handler
= CatchSignal( SIGTERM
, SIGNAL_CAST SIG_DFL
);
342 /* We only count IPv4, non-loopback interfaces here. */
343 while (iface_count_v4_nl() == 0) {
348 CatchSignal( SIGTERM
, SIGNAL_CAST saved_handler
);
351 * We got an interface, go back to blocking term.
358 /**************************************************************************** **
359 Reload the services file.
360 **************************************************************************** */
362 static bool reload_nmbd_services(bool test
)
366 set_remote_machine_name("nmbd", False
);
369 const char *fname
= lp_configfile();
370 if (file_exist(fname
) && !strcsequal(fname
,get_dyn_CONFIGFILE())) {
371 set_dyn_CONFIGFILE(fname
);
376 if ( test
&& !lp_file_list_changed() )
379 ret
= lp_load(get_dyn_CONFIGFILE(), True
, False
, False
, True
);
381 /* perhaps the config filename is now set */
383 DEBUG( 3, ( "services not loaded\n" ) );
384 reload_nmbd_services( True
);
390 /**************************************************************************** **
391 * React on 'smbcontrol nmbd reload-config' in the same way as to SIGHUP
392 **************************************************************************** */
394 static void msg_reload_nmbd_services(struct messaging_context
*msg
,
397 struct server_id server_id
,
400 write_browse_list( 0, True
);
401 dump_all_namelists();
402 reload_nmbd_services( True
);
404 reload_interfaces(0);
407 static void msg_nmbd_send_packet(struct messaging_context
*msg
,
410 struct server_id src
,
413 struct packet_struct
*p
= (struct packet_struct
*)data
->data
;
414 struct subnet_record
*subrec
;
415 struct sockaddr_storage ss
;
416 const struct sockaddr_storage
*pss
;
417 const struct in_addr
*local_ip
;
419 DEBUG(10, ("Received send_packet from %u\n", (unsigned int)procid_to_pid(&src
)));
421 if (data
->length
!= sizeof(struct packet_struct
)) {
422 DEBUG(2, ("Discarding invalid packet length from %u\n",
423 (unsigned int)procid_to_pid(&src
)));
427 if ((p
->packet_type
!= NMB_PACKET
) &&
428 (p
->packet_type
!= DGRAM_PACKET
)) {
429 DEBUG(2, ("Discarding invalid packet type from %u: %d\n",
430 (unsigned int)procid_to_pid(&src
), p
->packet_type
));
434 in_addr_to_sockaddr_storage(&ss
, p
->ip
);
435 pss
= iface_ip((struct sockaddr
*)&ss
);
438 DEBUG(2, ("Could not find ip for packet from %u\n",
439 (unsigned int)procid_to_pid(&src
)));
443 local_ip
= &((const struct sockaddr_in
*)pss
)->sin_addr
;
444 subrec
= FIRST_SUBNET
;
447 p
->send_fd
= (p
->packet_type
== NMB_PACKET
) ?
448 subrec
->nmb_sock
: subrec
->dgram_sock
;
450 for (subrec
= FIRST_SUBNET
; subrec
!= NULL
;
451 subrec
= NEXT_SUBNET_EXCLUDING_UNICAST(subrec
)) {
452 if (ip_equal_v4(*local_ip
, subrec
->myip
)) {
453 p
->send_fd
= (p
->packet_type
== NMB_PACKET
) ?
454 subrec
->nmb_sock
: subrec
->dgram_sock
;
459 if (p
->packet_type
== DGRAM_PACKET
) {
461 p
->packet
.dgram
.header
.source_ip
.s_addr
= local_ip
->s_addr
;
462 p
->packet
.dgram
.header
.source_port
= 138;
468 /**************************************************************************** **
469 The main select loop.
470 **************************************************************************** */
472 static void process(void)
477 time_t t
= time(NULL
);
478 TALLOC_CTX
*frame
= talloc_stackframe();
481 * Check all broadcast subnets to see if
482 * we need to run an election on any of them.
486 run_election
= check_elections();
489 * Read incoming UDP packets.
493 if(listen_for_packets(run_election
)) {
499 * Process all incoming packets
500 * read above. This calls the success and
501 * failure functions registered when response
502 * packets arrrive, and also deals with request
503 * packets from other sources.
510 * Run any elections - initiate becoming
511 * a local master browser if we have won.
518 * Send out any broadcast announcements
519 * of our server names. This also announces
520 * the workgroup name if we are a local
522 * (nmbd_sendannounce.c)
525 announce_my_server_names(t
);
528 * Send out any LanMan broadcast announcements
529 * of our server names.
530 * (nmbd_sendannounce.c)
533 announce_my_lm_server_names(t
);
536 * If we are a local master browser, periodically
537 * announce ourselves to the domain master browser.
538 * This also deals with syncronising the domain master
539 * browser server lists with ourselves as a local
541 * (nmbd_sendannounce.c)
544 announce_myself_to_domain_master_browser(t
);
547 * Fullfill any remote announce requests.
548 * (nmbd_sendannounce.c)
554 * Fullfill any remote browse sync announce requests.
555 * (nmbd_sendannounce.c)
558 browse_sync_remote(t
);
561 * Scan the broadcast subnets, and WINS client
562 * namelists and refresh any that need refreshing.
569 * Scan the subnet namelists and server lists and
570 * expire thos that have timed out.
574 expire_names_and_servers(t
);
577 * Write out a snapshot of our current browse list into
578 * the browse.dat file. This is used by smbd to service
579 * incoming NetServerEnum calls - used to synchronise
580 * browse lists over subnets.
581 * (nmbd_serverlistdb.c)
584 write_browse_list(t
, False
);
587 * If we are a domain master browser, we have a list of
588 * local master browsers we should synchronise browse
589 * lists with (these are added by an incoming local
590 * master browser announcement packet). Expire any of
591 * these that are no longer current, and pull the server
592 * lists from each of these known local master browsers.
593 * (nmbd_browsesync.c)
596 dmb_expire_and_sync_browser_lists(t
);
599 * Check that there is a local master browser for our
600 * workgroup for all our broadcast subnets. If one
601 * is not found, start an election (which we ourselves
602 * may or may not participate in, depending on the
603 * setting of the 'local master' parameter.
607 check_master_browser_exists(t
);
610 * If we are configured as a logon server, attempt to
611 * register the special NetBIOS names to become such
612 * (WORKGROUP<1c> name) on all broadcast subnets and
613 * with the WINS server (if used). If we are configured
614 * to become a domain master browser, attempt to register
615 * the special NetBIOS name (WORKGROUP<1b> name) to
617 * (nmbd_become_dmb.c)
623 * If we are a WINS server, do any timer dependent
624 * processing required.
625 * (nmbd_winsserver.c)
628 initiate_wins_processing(t
);
631 * If we are a domain master browser, attempt to contact the
632 * WINS server to get a list of all known WORKGROUPS/DOMAINS.
633 * This will only work to a Samba WINS server.
634 * (nmbd_browsesync.c)
637 if (lp_enhanced_browsing())
638 collect_all_workgroup_names_from_wins_server(t
);
641 * Go through the response record queue and time out or re-transmit
642 * and expired entries.
646 retransmit_or_expire_response_records(t
);
649 * check to see if any remote browse sync child processes have completed
652 sync_check_completion();
655 * regularly sync with any other DMBs we know about
658 if (lp_enhanced_browsing())
662 * clear the unexpected packet queue
667 /* check for new network interfaces */
669 reload_interfaces(t
);
671 /* free up temp memory */
676 /**************************************************************************** **
677 Open the socket communication.
678 **************************************************************************** */
680 static bool open_sockets(bool isdaemon
, int port
)
682 struct sockaddr_storage ss
;
683 const char *sock_addr
= lp_socket_address();
686 * The sockets opened here will be used to receive broadcast
687 * packets *only*. Interface specific sockets are opened in
688 * make_subnet() in namedbsubnet.c. Thus we bind to the
689 * address "0.0.0.0". The parameter 'socket address' is
693 if (!interpret_string_addr(&ss
, sock_addr
,
694 AI_NUMERICHOST
|AI_PASSIVE
)) {
695 DEBUG(0,("open_sockets: unable to get socket address "
696 "from string %s", sock_addr
));
699 if (ss
.ss_family
!= AF_INET
) {
700 DEBUG(0,("open_sockets: unable to use IPv6 socket"
707 ClientNMB
= open_socket_in(SOCK_DGRAM
, port
,
714 if (ClientNMB
== -1) {
718 ClientDGRAM
= open_socket_in(SOCK_DGRAM
, DGRAM_PORT
,
722 if (ClientDGRAM
== -1) {
723 if (ClientNMB
!= 0) {
729 /* we are never interested in SIGPIPE */
730 BlockSignals(True
,SIGPIPE
);
732 set_socket_options( ClientNMB
, "SO_BROADCAST" );
733 set_socket_options( ClientDGRAM
, "SO_BROADCAST" );
735 /* Ensure we're non-blocking. */
736 set_blocking( ClientNMB
, False
);
737 set_blocking( ClientDGRAM
, False
);
739 DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
743 /**************************************************************************** **
745 **************************************************************************** */
747 int main(int argc
, const char *argv
[])
749 static bool is_daemon
;
750 static bool opt_interactive
;
751 static bool Fork
= true;
752 static bool no_process_group
;
753 static bool log_stdout
;
755 char *p_lmhosts
= NULL
;
761 OPT_NO_PROCESS_GROUP
,
764 struct poptOption long_options
[] = {
766 {"daemon", 'D', POPT_ARG_NONE
, NULL
, OPT_DAEMON
, "Become a daemon(default)" },
767 {"interactive", 'i', POPT_ARG_NONE
, NULL
, OPT_INTERACTIVE
, "Run interactive (not a daemon)" },
768 {"foreground", 'F', POPT_ARG_NONE
, NULL
, OPT_FORK
, "Run daemon in foreground (for daemontools & etc)" },
769 {"no-process-group", 0, POPT_ARG_NONE
, NULL
, OPT_NO_PROCESS_GROUP
, "Don't create a new process group" },
770 {"log-stdout", 'S', POPT_ARG_NONE
, NULL
, OPT_LOG_STDOUT
, "Log to stdout" },
771 {"hosts", 'H', POPT_ARG_STRING
, &p_lmhosts
, 0, "Load a netbios hosts file"},
772 {"port", 'p', POPT_ARG_INT
, &global_nmb_port
, 0, "Listen on the specified port" },
776 TALLOC_CTX
*frame
= talloc_stackframe(); /* Setup tos. */
780 global_nmb_port
= NMB_PORT
;
782 pc
= poptGetContext("nmbd", argc
, argv
, long_options
, 0);
783 while ((opt
= poptGetNextOpt(pc
)) != -1) {
788 case OPT_INTERACTIVE
:
789 opt_interactive
= true;
794 case OPT_NO_PROCESS_GROUP
:
795 no_process_group
= true;
801 d_fprintf(stderr
, "\nInvalid option %s: %s\n\n",
802 poptBadOption(pc
, 0), poptStrerror(opt
));
803 poptPrintUsage(pc
, stderr
, 0);
809 global_in_nmbd
= true;
811 StartupTime
= time(NULL
);
813 sys_srandom(time(NULL
) ^ sys_getpid());
815 if (!override_logfile
) {
817 if (asprintf(&lfile
, "%s/log.nmbd", get_dyn_LOGFILEBASE()) < 0) {
820 lp_set_logfile(lfile
);
824 fault_setup((void (*)(void *))fault_continue
);
825 dump_core_setup("nmbd");
827 /* POSIX demands that signals are inherited. If the invoking process has
828 * these signals masked, we will have problems, as we won't receive them. */
829 BlockSignals(False
, SIGHUP
);
830 BlockSignals(False
, SIGUSR1
);
831 BlockSignals(False
, SIGTERM
);
834 /* we are never interested in SIGFPE */
835 BlockSignals(True
,SIGFPE
);
838 /* We no longer use USR2... */
840 BlockSignals(True
, SIGUSR2
);
843 if ( opt_interactive
) {
848 if ( log_stdout
&& Fork
) {
849 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
853 setup_logging( argv
[0], log_stdout
);
857 DEBUG(0,("nmbd version %s started.\n", samba_version_string()));
858 DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE
));
860 if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
861 DEBUG(0, ("error opening config file\n"));
865 if (nmbd_messaging_context() == NULL
) {
869 if ( !reload_nmbd_services(False
) )
875 reload_nmbd_services( True
);
877 if (strequal(lp_workgroup(),"*")) {
878 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
884 if (!is_daemon
&& !is_a_socket(0)) {
885 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
889 if (is_daemon
&& !opt_interactive
) {
890 DEBUG( 2, ( "Becoming a daemon.\n" ) );
891 become_daemon(Fork
, no_process_group
);
896 * If we're interactive we want to set our own process group for
899 if (opt_interactive
&& !no_process_group
)
900 setpgid( (pid_t
)0, (pid_t
)0 );
903 if (nmbd_messaging_context() == NULL
) {
908 /* Setup the async dns. We do it here so it doesn't have all the other
909 stuff initialised and thus chewing memory and sockets */
910 if(lp_we_are_a_wins_server() && lp_dns_proxy()) {
915 if (!directory_exist(lp_lockdir())) {
916 mkdir(lp_lockdir(), 0755);
919 pidfile_create("nmbd");
921 if (!NT_STATUS_IS_OK(reinit_after_fork(nmbd_messaging_context(),
922 nmbd_event_context(), false))) {
923 DEBUG(0,("reinit_after_fork() failed\n"));
927 if (!nmbd_setup_sig_term_handler())
929 if (!nmbd_setup_sig_hup_handler())
932 /* get broadcast messages */
933 claim_connection(NULL
,"",FLAG_MSG_GENERAL
|FLAG_MSG_DBWRAP
);
935 messaging_register(nmbd_messaging_context(), NULL
,
936 MSG_FORCE_ELECTION
, nmbd_message_election
);
938 /* Until winsrepl is done. */
939 messaging_register(nmbd_messaging_context(), NULL
,
940 MSG_WINS_NEW_ENTRY
, nmbd_wins_new_entry
);
942 messaging_register(nmbd_messaging_context(), NULL
,
943 MSG_SHUTDOWN
, nmbd_terminate
);
944 messaging_register(nmbd_messaging_context(), NULL
,
945 MSG_SMB_CONF_UPDATED
, msg_reload_nmbd_services
);
946 messaging_register(nmbd_messaging_context(), NULL
,
947 MSG_SEND_PACKET
, msg_nmbd_send_packet
);
951 DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port
) );
953 if ( !open_sockets( is_daemon
, global_nmb_port
) ) {
954 kill_async_dns_child();
958 /* Determine all the IP addresses we have. */
961 /* Create an nmbd subnet record for each of the above. */
962 if( False
== create_subnets() ) {
963 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
964 kill_async_dns_child();
968 /* Load in any static local names. */
970 set_dyn_LMHOSTSFILE(p_lmhosts
);
972 load_lmhosts_file(get_dyn_LMHOSTSFILE());
973 DEBUG(3,("Loaded hosts file %s\n", get_dyn_LMHOSTSFILE()));
975 /* If we are acting as a WINS server, initialise data structures. */
976 if( !initialise_wins() ) {
977 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
978 kill_async_dns_child();
983 * Register nmbd primary workgroup and nmbd names on all
984 * the broadcast subnets, and on the WINS server (if specified).
985 * Also initiate the startup of our primary workgroup (start
986 * elections if we are setup as being able to be a local
990 if( False
== register_my_workgroup_and_names() ) {
991 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
992 kill_async_dns_child();
996 if (!initialize_nmbd_proxy_logon()) {
997 DEBUG(0,("ERROR: Failed setup nmbd_proxy_logon.\n"));
998 kill_async_dns_child();
1007 kill_async_dns_child();