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 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(void)
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(procid_self());
88 static void nmbd_sig_term_handler(struct tevent_context
*ev
,
89 struct tevent_signal
*se
,
98 static bool nmbd_setup_sig_term_handler(void)
100 struct tevent_signal
*se
;
102 se
= tevent_add_signal(nmbd_event_context(),
103 nmbd_event_context(),
105 nmbd_sig_term_handler
,
108 DEBUG(0,("failed to setup SIGTERM handler"));
115 static void msg_reload_nmbd_services(struct messaging_context
*msg
,
118 struct server_id server_id
,
121 static void nmbd_sig_hup_handler(struct tevent_context
*ev
,
122 struct tevent_signal
*se
,
128 DEBUG(0,("Got SIGHUP dumping debug info.\n"));
129 msg_reload_nmbd_services(nmbd_messaging_context(),
130 NULL
, MSG_SMB_CONF_UPDATED
,
131 procid_self(), NULL
);
134 static bool nmbd_setup_sig_hup_handler(void)
136 struct tevent_signal
*se
;
138 se
= tevent_add_signal(nmbd_event_context(),
139 nmbd_event_context(),
141 nmbd_sig_hup_handler
,
144 DEBUG(0,("failed to setup SIGHUP handler"));
151 /**************************************************************************** **
152 Handle a SHUTDOWN message from smbcontrol.
153 **************************************************************************** */
155 static void nmbd_terminate(struct messaging_context
*msg
,
158 struct server_id server_id
,
164 /**************************************************************************** **
165 Possibly continue after a fault.
166 **************************************************************************** */
168 static void fault_continue(void)
173 /**************************************************************************** **
174 Expire old names from the namelist and server list.
175 **************************************************************************** */
177 static void expire_names_and_servers(time_t t
)
179 static time_t lastrun
= 0;
183 if ( t
< (lastrun
+ 5) )
188 * Expire any timed out names on all the broadcast
189 * subnets and those registered with the WINS server.
190 * (nmbd_namelistdb.c)
196 * Go through all the broadcast subnets and for each
197 * workgroup known on that subnet remove any expired
198 * server names. If a workgroup has an empty serverlist
199 * and has itself timed out then remove the workgroup.
200 * (nmbd_workgroupdb.c)
203 expire_workgroups_and_servers(t
);
206 /************************************************************************** **
207 Reload the list of network interfaces.
208 Doesn't return until a network interface is up.
209 ************************************************************************** */
211 static void reload_interfaces(time_t t
)
215 bool print_waiting_msg
= true;
216 struct subnet_record
*subrec
;
218 if (t
&& ((t
- lastt
) < NMBD_INTERFACES_RELOAD
)) {
224 if (!interfaces_changed()) {
230 /* the list of probed interfaces has changed, we may need to add/remove
234 /* find any interfaces that need adding */
235 for (n
=iface_count() - 1; n
>= 0; n
--) {
236 char str
[INET6_ADDRSTRLEN
];
237 const struct interface
*iface
= get_interface(n
);
238 struct in_addr ip
, nmask
;
241 DEBUG(2,("reload_interfaces: failed to get interface %d\n", n
));
245 /* Ensure we're only dealing with IPv4 here. */
246 if (iface
->ip
.ss_family
!= AF_INET
) {
247 DEBUG(2,("reload_interfaces: "
248 "ignoring non IPv4 interface.\n"));
252 ip
= ((struct sockaddr_in
*)(void *)&iface
->ip
)->sin_addr
;
253 nmask
= ((struct sockaddr_in
*)(void *)
254 &iface
->netmask
)->sin_addr
;
257 * We don't want to add a loopback interface, in case
258 * someone has added 127.0.0.1 for smbd, nmbd needs to
259 * ignore it here. JRA.
262 if (is_loopback_addr((struct sockaddr
*)(void *)&iface
->ip
)) {
263 DEBUG(2,("reload_interfaces: Ignoring loopback "
265 print_sockaddr(str
, sizeof(str
), &iface
->ip
) ));
269 for (subrec
=subnetlist
; subrec
; subrec
=subrec
->next
) {
270 if (ip_equal_v4(ip
, subrec
->myip
) &&
271 ip_equal_v4(nmask
, subrec
->mask_ip
)) {
277 /* it wasn't found! add it */
278 DEBUG(2,("Found new interface %s\n",
280 sizeof(str
), &iface
->ip
) ));
281 subrec
= make_normal_subnet(iface
);
283 register_my_workgroup_one_subnet(subrec
);
287 /* find any interfaces that need deleting */
288 for (subrec
=subnetlist
; subrec
; subrec
=subrec
->next
) {
289 for (n
=iface_count() - 1; n
>= 0; n
--) {
290 struct interface
*iface
= get_interface(n
);
291 struct in_addr ip
, nmask
;
295 /* Ensure we're only dealing with IPv4 here. */
296 if (iface
->ip
.ss_family
!= AF_INET
) {
297 DEBUG(2,("reload_interfaces: "
298 "ignoring non IPv4 interface.\n"));
301 ip
= ((struct sockaddr_in
*)(void *)
302 &iface
->ip
)->sin_addr
;
303 nmask
= ((struct sockaddr_in
*)(void *)
304 &iface
->netmask
)->sin_addr
;
305 if (ip_equal_v4(ip
, subrec
->myip
) &&
306 ip_equal_v4(nmask
, subrec
->mask_ip
)) {
311 /* oops, an interface has disapeared. This is
312 tricky, we don't dare actually free the
313 interface as it could be being used, so
314 instead we just wear the memory leak and
315 remove it from the list of interfaces without
317 DEBUG(2,("Deleting dead interface %s\n",
318 inet_ntoa(subrec
->myip
)));
319 close_subnet(subrec
);
323 rescan_listen_set
= True
;
325 /* We need to wait if there are no subnets... */
326 if (FIRST_SUBNET
== NULL
) {
327 void (*saved_handler
)(int);
329 if (print_waiting_msg
) {
330 DEBUG(0,("reload_interfaces: "
331 "No subnets to listen to. Waiting..\n"));
332 print_waiting_msg
= false;
336 * Whilst we're waiting for an interface, allow SIGTERM to
339 saved_handler
= CatchSignal(SIGTERM
, SIG_DFL
);
341 /* We only count IPv4, non-loopback interfaces here. */
342 while (iface_count_v4_nl() == 0) {
347 CatchSignal(SIGTERM
, saved_handler
);
350 * We got an interface, go back to blocking term.
357 /**************************************************************************** **
358 Reload the services file.
359 **************************************************************************** */
361 static bool reload_nmbd_services(bool test
)
365 set_remote_machine_name("nmbd", False
);
368 char *fname
= lp_configfile();
369 if (file_exist(fname
) && !strcsequal(fname
,get_dyn_CONFIGFILE())) {
370 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
*)(void *)&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())
661 /* check for new network interfaces */
663 reload_interfaces(t
);
665 /* free up temp memory */
670 /**************************************************************************** **
671 Open the socket communication.
672 **************************************************************************** */
674 static bool open_sockets(bool isdaemon
, int port
)
676 struct sockaddr_storage ss
;
677 const char *sock_addr
= lp_socket_address();
680 * The sockets opened here will be used to receive broadcast
681 * packets *only*. Interface specific sockets are opened in
682 * make_subnet() in namedbsubnet.c. Thus we bind to the
683 * address "0.0.0.0". The parameter 'socket address' is
687 if (!interpret_string_addr(&ss
, sock_addr
,
688 AI_NUMERICHOST
|AI_PASSIVE
)) {
689 DEBUG(0,("open_sockets: unable to get socket address "
690 "from string %s", sock_addr
));
693 if (ss
.ss_family
!= AF_INET
) {
694 DEBUG(0,("open_sockets: unable to use IPv6 socket"
701 ClientNMB
= open_socket_in(SOCK_DGRAM
, port
,
708 if (ClientNMB
== -1) {
712 ClientDGRAM
= open_socket_in(SOCK_DGRAM
, DGRAM_PORT
,
716 if (ClientDGRAM
== -1) {
717 if (ClientNMB
!= 0) {
723 /* we are never interested in SIGPIPE */
724 BlockSignals(True
,SIGPIPE
);
726 set_socket_options( ClientNMB
, "SO_BROADCAST" );
727 set_socket_options( ClientDGRAM
, "SO_BROADCAST" );
729 /* Ensure we're non-blocking. */
730 set_blocking( ClientNMB
, False
);
731 set_blocking( ClientDGRAM
, False
);
733 DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
737 /**************************************************************************** **
739 **************************************************************************** */
741 int main(int argc
, const char *argv
[])
743 static bool is_daemon
;
744 static bool opt_interactive
;
745 static bool Fork
= true;
746 static bool no_process_group
;
747 static bool log_stdout
;
749 char *p_lmhosts
= NULL
;
755 OPT_NO_PROCESS_GROUP
,
758 struct poptOption long_options
[] = {
760 {"daemon", 'D', POPT_ARG_NONE
, NULL
, OPT_DAEMON
, "Become a daemon(default)" },
761 {"interactive", 'i', POPT_ARG_NONE
, NULL
, OPT_INTERACTIVE
, "Run interactive (not a daemon)" },
762 {"foreground", 'F', POPT_ARG_NONE
, NULL
, OPT_FORK
, "Run daemon in foreground (for daemontools & etc)" },
763 {"no-process-group", 0, POPT_ARG_NONE
, NULL
, OPT_NO_PROCESS_GROUP
, "Don't create a new process group" },
764 {"log-stdout", 'S', POPT_ARG_NONE
, NULL
, OPT_LOG_STDOUT
, "Log to stdout" },
765 {"hosts", 'H', POPT_ARG_STRING
, &p_lmhosts
, 0, "Load a netbios hosts file"},
766 {"port", 'p', POPT_ARG_INT
, &global_nmb_port
, 0, "Listen on the specified port" },
774 * Do this before any other talloc operation
776 talloc_enable_null_tracking();
777 frame
= talloc_stackframe();
781 global_nmb_port
= NMB_PORT
;
783 pc
= poptGetContext("nmbd", argc
, argv
, long_options
, 0);
784 while ((opt
= poptGetNextOpt(pc
)) != -1) {
789 case OPT_INTERACTIVE
:
790 opt_interactive
= true;
795 case OPT_NO_PROCESS_GROUP
:
796 no_process_group
= true;
802 d_fprintf(stderr
, "\nInvalid option %s: %s\n\n",
803 poptBadOption(pc
, 0), poptStrerror(opt
));
804 poptPrintUsage(pc
, stderr
, 0);
810 global_in_nmbd
= true;
812 StartupTime
= time(NULL
);
814 sys_srandom(time(NULL
) ^ sys_getpid());
816 if (!override_logfile
) {
818 if (asprintf(&lfile
, "%s/log.nmbd", get_dyn_LOGFILEBASE()) < 0) {
821 lp_set_logfile(lfile
);
825 fault_setup((void (*)(void *))fault_continue
);
826 dump_core_setup("nmbd");
828 /* POSIX demands that signals are inherited. If the invoking process has
829 * these signals masked, we will have problems, as we won't receive them. */
830 BlockSignals(False
, SIGHUP
);
831 BlockSignals(False
, SIGUSR1
);
832 BlockSignals(False
, SIGTERM
);
835 /* we are never interested in SIGFPE */
836 BlockSignals(True
,SIGFPE
);
839 /* We no longer use USR2... */
841 BlockSignals(True
, SIGUSR2
);
844 if ( opt_interactive
) {
849 if ( log_stdout
&& Fork
) {
850 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
854 setup_logging( argv
[0], DEBUG_STDOUT
);
856 setup_logging( argv
[0], DEBUG_FILE
);
861 DEBUG(0,("nmbd version %s started.\n", samba_version_string()));
862 DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE
));
864 if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
865 DEBUG(0, ("error opening config file\n"));
869 if (nmbd_messaging_context() == NULL
) {
873 if ( !reload_nmbd_services(False
) )
879 reload_nmbd_services( True
);
881 if (strequal(lp_workgroup(),"*")) {
882 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
888 if (!is_daemon
&& !is_a_socket(0)) {
889 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
893 if (is_daemon
&& !opt_interactive
) {
894 DEBUG( 2, ( "Becoming a daemon.\n" ) );
895 become_daemon(Fork
, no_process_group
, log_stdout
);
900 * If we're interactive we want to set our own process group for
903 if (opt_interactive
&& !no_process_group
)
904 setpgid( (pid_t
)0, (pid_t
)0 );
907 if (nmbd_messaging_context() == NULL
) {
912 /* Setup the async dns. We do it here so it doesn't have all the other
913 stuff initialised and thus chewing memory and sockets */
914 if(lp_we_are_a_wins_server() && lp_dns_proxy()) {
919 if (!directory_exist(lp_lockdir())) {
920 mkdir(lp_lockdir(), 0755);
923 pidfile_create("nmbd");
925 status
= reinit_after_fork(nmbd_messaging_context(),
926 nmbd_event_context(),
927 procid_self(), false);
929 if (!NT_STATUS_IS_OK(status
)) {
930 DEBUG(0,("reinit_after_fork() failed\n"));
934 if (!nmbd_setup_sig_term_handler())
936 if (!nmbd_setup_sig_hup_handler())
939 /* get broadcast messages */
941 if (!serverid_register(procid_self(),
942 FLAG_MSG_GENERAL
|FLAG_MSG_DBWRAP
)) {
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();
1022 kill_async_dns_child();