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
;
55 if (!ctx
&& !(ctx
= messaging_init(NULL
, server_id_self(),
56 nmbd_event_context()))) {
57 smb_panic("Could not init nmbd messaging context");
62 /**************************************************************************** **
63 Handle a SIGTERM in band.
64 **************************************************************************** */
66 static void terminate(void)
68 DEBUG(0,("Got SIGTERM: going down...\n"));
70 /* Write out wins.dat file if samba is a WINS server */
71 wins_write_database(0,False
);
73 /* Remove all SELF registered names from WINS */
76 /* Announce all server entries as 0 time-to-live, 0 type. */
77 announce_my_servers_removed();
79 /* If there was an async dns child - kill it. */
80 kill_async_dns_child();
85 /**************************************************************************** **
86 Handle a SHUTDOWN message from smbcontrol.
87 **************************************************************************** */
89 static void nmbd_terminate(struct messaging_context
*msg
,
92 struct server_id server_id
,
98 /**************************************************************************** **
99 Catch a SIGTERM signal.
100 **************************************************************************** */
102 static SIG_ATOMIC_T got_sig_term
;
104 static void sig_term(int sig
)
107 sys_select_signal(SIGTERM
);
110 /**************************************************************************** **
111 Catch a SIGHUP signal.
112 **************************************************************************** */
114 static SIG_ATOMIC_T reload_after_sighup
;
116 static void sig_hup(int sig
)
118 reload_after_sighup
= 1;
119 sys_select_signal(SIGHUP
);
122 /**************************************************************************** **
123 Possibly continue after a fault.
124 **************************************************************************** */
126 static void fault_continue(void)
131 /**************************************************************************** **
132 Expire old names from the namelist and server list.
133 **************************************************************************** */
135 static void expire_names_and_servers(time_t t
)
137 static time_t lastrun
= 0;
141 if ( t
< (lastrun
+ 5) )
146 * Expire any timed out names on all the broadcast
147 * subnets and those registered with the WINS server.
148 * (nmbd_namelistdb.c)
154 * Go through all the broadcast subnets and for each
155 * workgroup known on that subnet remove any expired
156 * server names. If a workgroup has an empty serverlist
157 * and has itself timed out then remove the workgroup.
158 * (nmbd_workgroupdb.c)
161 expire_workgroups_and_servers(t
);
164 /************************************************************************** **
165 Reload the list of network interfaces.
166 Doesn't return until a network interface is up.
167 ************************************************************************** */
169 static void reload_interfaces(time_t t
)
173 bool print_waiting_msg
= true;
174 struct subnet_record
*subrec
;
176 if (t
&& ((t
- lastt
) < NMBD_INTERFACES_RELOAD
)) {
182 if (!interfaces_changed()) {
188 /* the list of probed interfaces has changed, we may need to add/remove
192 /* find any interfaces that need adding */
193 for (n
=iface_count() - 1; n
>= 0; n
--) {
194 char str
[INET6_ADDRSTRLEN
];
195 const struct interface
*iface
= get_interface(n
);
196 struct in_addr ip
, nmask
;
199 DEBUG(2,("reload_interfaces: failed to get interface %d\n", n
));
203 /* Ensure we're only dealing with IPv4 here. */
204 if (iface
->ip
.ss_family
!= AF_INET
) {
205 DEBUG(2,("reload_interfaces: "
206 "ignoring non IPv4 interface.\n"));
210 ip
= ((struct sockaddr_in
*)&iface
->ip
)->sin_addr
;
211 nmask
= ((struct sockaddr_in
*)&iface
->netmask
)->sin_addr
;
214 * We don't want to add a loopback interface, in case
215 * someone has added 127.0.0.1 for smbd, nmbd needs to
216 * ignore it here. JRA.
219 if (is_loopback_addr(&iface
->ip
)) {
220 DEBUG(2,("reload_interfaces: Ignoring loopback "
222 print_sockaddr(str
, sizeof(str
), &iface
->ip
) ));
226 for (subrec
=subnetlist
; subrec
; subrec
=subrec
->next
) {
227 if (ip_equal_v4(ip
, subrec
->myip
) &&
228 ip_equal_v4(nmask
, subrec
->mask_ip
)) {
234 /* it wasn't found! add it */
235 DEBUG(2,("Found new interface %s\n",
237 sizeof(str
), &iface
->ip
) ));
238 subrec
= make_normal_subnet(iface
);
240 register_my_workgroup_one_subnet(subrec
);
244 /* find any interfaces that need deleting */
245 for (subrec
=subnetlist
; subrec
; subrec
=subrec
->next
) {
246 for (n
=iface_count() - 1; n
>= 0; n
--) {
247 struct interface
*iface
= get_interface(n
);
248 struct in_addr ip
, nmask
;
252 /* Ensure we're only dealing with IPv4 here. */
253 if (iface
->ip
.ss_family
!= AF_INET
) {
254 DEBUG(2,("reload_interfaces: "
255 "ignoring non IPv4 interface.\n"));
258 ip
= ((struct sockaddr_in
*)&iface
->ip
)->sin_addr
;
259 nmask
= ((struct sockaddr_in
*)&iface
->netmask
)->sin_addr
;
260 if (ip_equal_v4(ip
, subrec
->myip
) &&
261 ip_equal_v4(nmask
, subrec
->mask_ip
)) {
266 /* oops, an interface has disapeared. This is
267 tricky, we don't dare actually free the
268 interface as it could be being used, so
269 instead we just wear the memory leak and
270 remove it from the list of interfaces without
272 DEBUG(2,("Deleting dead interface %s\n",
273 inet_ntoa(subrec
->myip
)));
274 close_subnet(subrec
);
278 rescan_listen_set
= True
;
280 /* We need to wait if there are no subnets... */
281 if (FIRST_SUBNET
== NULL
) {
283 if (print_waiting_msg
) {
284 DEBUG(0,("reload_interfaces: "
285 "No subnets to listen to. Waiting..\n"));
286 print_waiting_msg
= false;
290 * Whilst we're waiting for an interface, allow SIGTERM to
294 BlockSignals(false, SIGTERM
);
296 /* We only count IPv4, non-loopback interfaces here. */
297 while (iface_count_v4_nl() == 0 && !got_sig_term
) {
303 * Handle termination inband.
312 * We got an interface, go back to blocking term.
315 BlockSignals(true, SIGTERM
);
320 /**************************************************************************** **
321 Reload the services file.
322 **************************************************************************** */
324 static bool reload_nmbd_services(bool test
)
328 set_remote_machine_name("nmbd", False
);
331 const char *fname
= lp_configfile();
332 if (file_exist(fname
,NULL
) && !strcsequal(fname
,get_dyn_CONFIGFILE())) {
333 set_dyn_CONFIGFILE(fname
);
338 if ( test
&& !lp_file_list_changed() )
341 ret
= lp_load(get_dyn_CONFIGFILE(), True
, False
, False
, True
);
343 /* perhaps the config filename is now set */
345 DEBUG( 3, ( "services not loaded\n" ) );
346 reload_nmbd_services( True
);
352 /**************************************************************************** **
353 * React on 'smbcontrol nmbd reload-config' in the same way as to SIGHUP
354 **************************************************************************** */
356 static void msg_reload_nmbd_services(struct messaging_context
*msg
,
359 struct server_id server_id
,
362 write_browse_list( 0, True
);
363 dump_all_namelists();
364 reload_nmbd_services( True
);
366 reload_interfaces(0);
369 static void msg_nmbd_send_packet(struct messaging_context
*msg
,
372 struct server_id src
,
375 struct packet_struct
*p
= (struct packet_struct
*)data
->data
;
376 struct subnet_record
*subrec
;
377 struct sockaddr_storage ss
;
378 const struct sockaddr_storage
*pss
;
379 const struct in_addr
*local_ip
;
381 DEBUG(10, ("Received send_packet from %d\n", procid_to_pid(&src
)));
383 if (data
->length
!= sizeof(struct packet_struct
)) {
384 DEBUG(2, ("Discarding invalid packet length from %d\n",
385 procid_to_pid(&src
)));
389 if ((p
->packet_type
!= NMB_PACKET
) &&
390 (p
->packet_type
!= DGRAM_PACKET
)) {
391 DEBUG(2, ("Discarding invalid packet type from %d: %d\n",
392 procid_to_pid(&src
), p
->packet_type
));
396 in_addr_to_sockaddr_storage(&ss
, p
->ip
);
400 DEBUG(2, ("Could not find ip for packet from %d\n",
401 procid_to_pid(&src
)));
405 local_ip
= &((const struct sockaddr_in
*)pss
)->sin_addr
;
406 subrec
= FIRST_SUBNET
;
408 p
->fd
= (p
->packet_type
== NMB_PACKET
) ?
409 subrec
->nmb_sock
: subrec
->dgram_sock
;
411 for (subrec
= FIRST_SUBNET
; subrec
!= NULL
;
412 subrec
= NEXT_SUBNET_EXCLUDING_UNICAST(subrec
)) {
413 if (ip_equal_v4(*local_ip
, subrec
->myip
)) {
414 p
->fd
= (p
->packet_type
== NMB_PACKET
) ?
415 subrec
->nmb_sock
: subrec
->dgram_sock
;
420 if (p
->packet_type
== DGRAM_PACKET
) {
422 p
->packet
.dgram
.header
.source_ip
.s_addr
= local_ip
->s_addr
;
423 p
->packet
.dgram
.header
.source_port
= 138;
429 /**************************************************************************** **
430 The main select loop.
431 **************************************************************************** */
433 static void process(void)
438 time_t t
= time(NULL
);
439 TALLOC_CTX
*frame
= talloc_stackframe();
441 /* Check for internal messages */
443 message_dispatch(nmbd_messaging_context());
446 * Check all broadcast subnets to see if
447 * we need to run an election on any of them.
451 run_election
= check_elections();
454 * Read incoming UDP packets.
458 if(listen_for_packets(run_election
)) {
464 * Handle termination inband.
473 * Process all incoming packets
474 * read above. This calls the success and
475 * failure functions registered when response
476 * packets arrrive, and also deals with request
477 * packets from other sources.
484 * Run any elections - initiate becoming
485 * a local master browser if we have won.
492 * Send out any broadcast announcements
493 * of our server names. This also announces
494 * the workgroup name if we are a local
496 * (nmbd_sendannounce.c)
499 announce_my_server_names(t
);
502 * Send out any LanMan broadcast announcements
503 * of our server names.
504 * (nmbd_sendannounce.c)
507 announce_my_lm_server_names(t
);
510 * If we are a local master browser, periodically
511 * announce ourselves to the domain master browser.
512 * This also deals with syncronising the domain master
513 * browser server lists with ourselves as a local
515 * (nmbd_sendannounce.c)
518 announce_myself_to_domain_master_browser(t
);
521 * Fullfill any remote announce requests.
522 * (nmbd_sendannounce.c)
528 * Fullfill any remote browse sync announce requests.
529 * (nmbd_sendannounce.c)
532 browse_sync_remote(t
);
535 * Scan the broadcast subnets, and WINS client
536 * namelists and refresh any that need refreshing.
543 * Scan the subnet namelists and server lists and
544 * expire thos that have timed out.
548 expire_names_and_servers(t
);
551 * Write out a snapshot of our current browse list into
552 * the browse.dat file. This is used by smbd to service
553 * incoming NetServerEnum calls - used to synchronise
554 * browse lists over subnets.
555 * (nmbd_serverlistdb.c)
558 write_browse_list(t
, False
);
561 * If we are a domain master browser, we have a list of
562 * local master browsers we should synchronise browse
563 * lists with (these are added by an incoming local
564 * master browser announcement packet). Expire any of
565 * these that are no longer current, and pull the server
566 * lists from each of these known local master browsers.
567 * (nmbd_browsesync.c)
570 dmb_expire_and_sync_browser_lists(t
);
573 * Check that there is a local master browser for our
574 * workgroup for all our broadcast subnets. If one
575 * is not found, start an election (which we ourselves
576 * may or may not participate in, depending on the
577 * setting of the 'local master' parameter.
581 check_master_browser_exists(t
);
584 * If we are configured as a logon server, attempt to
585 * register the special NetBIOS names to become such
586 * (WORKGROUP<1c> name) on all broadcast subnets and
587 * with the WINS server (if used). If we are configured
588 * to become a domain master browser, attempt to register
589 * the special NetBIOS name (WORKGROUP<1b> name) to
591 * (nmbd_become_dmb.c)
597 * If we are a WINS server, do any timer dependent
598 * processing required.
599 * (nmbd_winsserver.c)
602 initiate_wins_processing(t
);
605 * If we are a domain master browser, attempt to contact the
606 * WINS server to get a list of all known WORKGROUPS/DOMAINS.
607 * This will only work to a Samba WINS server.
608 * (nmbd_browsesync.c)
611 if (lp_enhanced_browsing())
612 collect_all_workgroup_names_from_wins_server(t
);
615 * Go through the response record queue and time out or re-transmit
616 * and expired entries.
620 retransmit_or_expire_response_records(t
);
623 * check to see if any remote browse sync child processes have completed
626 sync_check_completion();
629 * regularly sync with any other DMBs we know about
632 if (lp_enhanced_browsing())
636 * clear the unexpected packet queue
642 * Reload the services file if we got a sighup.
645 if(reload_after_sighup
) {
646 DEBUG( 0, ( "Got SIGHUP dumping debug info.\n" ) );
647 msg_reload_nmbd_services(nmbd_messaging_context(),
648 NULL
, MSG_SMB_CONF_UPDATED
,
649 procid_self(), NULL
);
651 reload_after_sighup
= 0;
654 /* check for new network interfaces */
656 reload_interfaces(t
);
658 /* free up temp memory */
663 /**************************************************************************** **
664 Open the socket communication.
665 **************************************************************************** */
667 static bool open_sockets(bool isdaemon
, int port
)
669 struct sockaddr_storage ss
;
670 const char *sock_addr
= lp_socket_address();
673 * The sockets opened here will be used to receive broadcast
674 * packets *only*. Interface specific sockets are opened in
675 * make_subnet() in namedbsubnet.c. Thus we bind to the
676 * address "0.0.0.0". The parameter 'socket address' is
680 if (!interpret_string_addr(&ss
, sock_addr
,
681 AI_NUMERICHOST
|AI_PASSIVE
)) {
682 DEBUG(0,("open_sockets: unable to get socket address "
683 "from string %s", sock_addr
));
686 if (ss
.ss_family
!= AF_INET
) {
687 DEBUG(0,("open_sockets: unable to use IPv6 socket"
694 ClientNMB
= open_socket_in(SOCK_DGRAM
, port
,
701 if (ClientNMB
== -1) {
705 ClientDGRAM
= open_socket_in(SOCK_DGRAM
, DGRAM_PORT
,
709 if (ClientDGRAM
== -1) {
710 if (ClientNMB
!= 0) {
716 /* we are never interested in SIGPIPE */
717 BlockSignals(True
,SIGPIPE
);
719 set_socket_options( ClientNMB
, "SO_BROADCAST" );
720 set_socket_options( ClientDGRAM
, "SO_BROADCAST" );
722 /* Ensure we're non-blocking. */
723 set_blocking( ClientNMB
, False
);
724 set_blocking( ClientDGRAM
, False
);
726 DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
730 /**************************************************************************** **
732 **************************************************************************** */
734 int main(int argc
, const char *argv
[])
736 static bool is_daemon
;
737 static bool opt_interactive
;
738 static bool Fork
= true;
739 static bool no_process_group
;
740 static bool log_stdout
;
742 char *p_lmhosts
= NULL
;
748 OPT_NO_PROCESS_GROUP
,
751 struct poptOption long_options
[] = {
753 {"daemon", 'D', POPT_ARG_NONE
, NULL
, OPT_DAEMON
, "Become a daemon(default)" },
754 {"interactive", 'i', POPT_ARG_NONE
, NULL
, OPT_INTERACTIVE
, "Run interactive (not a daemon)" },
755 {"foreground", 'F', POPT_ARG_NONE
, NULL
, OPT_FORK
, "Run daemon in foreground (for daemontools & etc)" },
756 {"no-process-group", 0, POPT_ARG_NONE
, NULL
, OPT_NO_PROCESS_GROUP
, "Don't create a new process group" },
757 {"log-stdout", 'S', POPT_ARG_NONE
, NULL
, OPT_LOG_STDOUT
, "Log to stdout" },
758 {"hosts", 'H', POPT_ARG_STRING
, &p_lmhosts
, 'H', "Load a netbios hosts file"},
759 {"port", 'p', POPT_ARG_INT
, &global_nmb_port
, NMB_PORT
, "Listen on the specified port" },
763 TALLOC_CTX
*frame
= talloc_stackframe(); /* Setup tos. */
765 db_tdb2_setup_messaging(NULL
, false);
769 global_nmb_port
= NMB_PORT
;
771 pc
= poptGetContext("nmbd", argc
, argv
, long_options
, 0);
772 while ((opt
= poptGetNextOpt(pc
)) != -1) {
777 case OPT_INTERACTIVE
:
778 opt_interactive
= true;
783 case OPT_NO_PROCESS_GROUP
:
784 no_process_group
= true;
790 d_fprintf(stderr
, "\nInvalid option %s: %s\n\n",
791 poptBadOption(pc
, 0), poptStrerror(opt
));
792 poptPrintUsage(pc
, stderr
, 0);
798 global_in_nmbd
= true;
800 StartupTime
= time(NULL
);
802 sys_srandom(time(NULL
) ^ sys_getpid());
804 if (!override_logfile
) {
805 char *logfile
= NULL
;
806 if (asprintf(&logfile
, "%s/log.nmbd", get_dyn_LOGFILEBASE()) < 0) {
809 lp_set_logfile(logfile
);
813 fault_setup((void (*)(void *))fault_continue
);
814 dump_core_setup("nmbd");
816 /* POSIX demands that signals are inherited. If the invoking process has
817 * these signals masked, we will have problems, as we won't receive them. */
818 BlockSignals(False
, SIGHUP
);
819 BlockSignals(False
, SIGUSR1
);
820 BlockSignals(False
, SIGTERM
);
822 CatchSignal( SIGHUP
, SIGNAL_CAST sig_hup
);
823 CatchSignal( SIGTERM
, SIGNAL_CAST sig_term
);
826 /* we are never interested in SIGFPE */
827 BlockSignals(True
,SIGFPE
);
830 /* We no longer use USR2... */
832 BlockSignals(True
, SIGUSR2
);
835 if ( opt_interactive
) {
840 if ( log_stdout
&& Fork
) {
841 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
845 setup_logging( argv
[0], log_stdout
);
849 DEBUG(0,("nmbd version %s started.\n", SAMBA_VERSION_STRING
));
850 DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE
));
852 if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
853 DEBUG(0, ("error opening config file\n"));
857 if (nmbd_messaging_context() == NULL
) {
861 db_tdb2_setup_messaging(nmbd_messaging_context(), true);
863 if ( !reload_nmbd_services(False
) )
869 reload_nmbd_services( True
);
871 if (strequal(lp_workgroup(),"*")) {
872 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
878 if (!is_daemon
&& !is_a_socket(0)) {
879 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
883 if (is_daemon
&& !opt_interactive
) {
884 DEBUG( 2, ( "Becoming a daemon.\n" ) );
885 become_daemon(Fork
, no_process_group
);
890 * If we're interactive we want to set our own process group for
893 if (opt_interactive
&& !no_process_group
)
894 setpgid( (pid_t
)0, (pid_t
)0 );
897 if (nmbd_messaging_context() == NULL
) {
902 /* Setup the async dns. We do it here so it doesn't have all the other
903 stuff initialised and thus chewing memory and sockets */
904 if(lp_we_are_a_wins_server() && lp_dns_proxy()) {
909 if (!directory_exist(lp_lockdir(), NULL
)) {
910 mkdir(lp_lockdir(), 0755);
913 pidfile_create("nmbd");
915 if (!reinit_after_fork(nmbd_messaging_context(), false)) {
916 DEBUG(0,("reinit_after_fork() failed\n"));
920 /* get broadcast messages */
921 claim_connection(NULL
,"",FLAG_MSG_GENERAL
|FLAG_MSG_DBWRAP
);
923 messaging_register(nmbd_messaging_context(), NULL
,
924 MSG_FORCE_ELECTION
, nmbd_message_election
);
926 /* Until winsrepl is done. */
927 messaging_register(nmbd_messaging_context(), NULL
,
928 MSG_WINS_NEW_ENTRY
, nmbd_wins_new_entry
);
930 messaging_register(nmbd_messaging_context(), NULL
,
931 MSG_SHUTDOWN
, nmbd_terminate
);
932 messaging_register(nmbd_messaging_context(), NULL
,
933 MSG_SMB_CONF_UPDATED
, msg_reload_nmbd_services
);
934 messaging_register(nmbd_messaging_context(), NULL
,
935 MSG_SEND_PACKET
, msg_nmbd_send_packet
);
939 DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port
) );
941 if ( !open_sockets( is_daemon
, global_nmb_port
) ) {
942 kill_async_dns_child();
946 /* Determine all the IP addresses we have. */
949 /* Create an nmbd subnet record for each of the above. */
950 if( False
== create_subnets() ) {
951 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
952 kill_async_dns_child();
956 /* Load in any static local names. */
958 set_dyn_LMHOSTSFILE(p_lmhosts
);
960 load_lmhosts_file(get_dyn_LMHOSTSFILE());
961 DEBUG(3,("Loaded hosts file %s\n", get_dyn_LMHOSTSFILE()));
963 /* If we are acting as a WINS server, initialise data structures. */
964 if( !initialise_wins() ) {
965 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
966 kill_async_dns_child();
971 * Register nmbd primary workgroup and nmbd names on all
972 * the broadcast subnets, and on the WINS server (if specified).
973 * Also initiate the startup of our primary workgroup (start
974 * elections if we are setup as being able to be a local
978 if( False
== register_my_workgroup_and_names() ) {
979 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
980 kill_async_dns_child();
984 /* We can only take signals in the select. */
985 BlockSignals( True
, SIGTERM
);
992 kill_async_dns_child();