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 "librpc/gen_ndr/messaging.h"
28 int global_nmb_port
= -1;
30 extern bool rescan_listen_set
;
31 extern bool global_in_nmbd
;
33 extern bool override_logfile
;
35 /* have we found LanMan clients yet? */
36 bool found_lm_clients
= False
;
38 /* what server type are we currently */
40 time_t StartupTime
= 0;
42 struct event_context
*nmbd_event_context(void)
44 static struct event_context
*ctx
;
46 if (!ctx
&& !(ctx
= event_context_init(NULL
))) {
47 smb_panic("Could not init nmbd event context");
52 struct messaging_context
*nmbd_messaging_context(void)
54 static struct messaging_context
*ctx
;
57 ctx
= messaging_init(NULL
, procid_self(),
58 nmbd_event_context());
61 DEBUG(0, ("Could not init nmbd messaging context.\n"));
66 /**************************************************************************** **
67 Handle a SIGTERM in band.
68 **************************************************************************** */
70 static void terminate(void)
72 DEBUG(0,("Got SIGTERM: going down...\n"));
74 /* Write out wins.dat file if samba is a WINS server */
75 wins_write_database(0,False
);
77 /* Remove all SELF registered names from WINS */
80 /* Announce all server entries as 0 time-to-live, 0 type. */
81 announce_my_servers_removed();
83 /* If there was an async dns child - kill it. */
84 kill_async_dns_child();
87 serverid_deregister_self();
94 static void nmbd_sig_term_handler(struct tevent_context
*ev
,
95 struct tevent_signal
*se
,
104 static bool nmbd_setup_sig_term_handler(void)
106 struct tevent_signal
*se
;
108 se
= tevent_add_signal(nmbd_event_context(),
109 nmbd_event_context(),
111 nmbd_sig_term_handler
,
114 DEBUG(0,("failed to setup SIGTERM handler"));
121 static void msg_reload_nmbd_services(struct messaging_context
*msg
,
124 struct server_id server_id
,
127 static void nmbd_sig_hup_handler(struct tevent_context
*ev
,
128 struct tevent_signal
*se
,
134 DEBUG(0,("Got SIGHUP dumping debug info.\n"));
135 msg_reload_nmbd_services(nmbd_messaging_context(),
136 NULL
, MSG_SMB_CONF_UPDATED
,
137 procid_self(), NULL
);
140 static bool nmbd_setup_sig_hup_handler(void)
142 struct tevent_signal
*se
;
144 se
= tevent_add_signal(nmbd_event_context(),
145 nmbd_event_context(),
147 nmbd_sig_hup_handler
,
150 DEBUG(0,("failed to setup SIGHUP handler"));
157 /**************************************************************************** **
158 Handle a SHUTDOWN message from smbcontrol.
159 **************************************************************************** */
161 static void nmbd_terminate(struct messaging_context
*msg
,
164 struct server_id server_id
,
170 /**************************************************************************** **
171 Possibly continue after a fault.
172 **************************************************************************** */
174 static void fault_continue(void)
179 /**************************************************************************** **
180 Expire old names from the namelist and server list.
181 **************************************************************************** */
183 static void expire_names_and_servers(time_t t
)
185 static time_t lastrun
= 0;
189 if ( t
< (lastrun
+ 5) )
194 * Expire any timed out names on all the broadcast
195 * subnets and those registered with the WINS server.
196 * (nmbd_namelistdb.c)
202 * Go through all the broadcast subnets and for each
203 * workgroup known on that subnet remove any expired
204 * server names. If a workgroup has an empty serverlist
205 * and has itself timed out then remove the workgroup.
206 * (nmbd_workgroupdb.c)
209 expire_workgroups_and_servers(t
);
212 /************************************************************************** **
213 Reload the list of network interfaces.
214 Doesn't return until a network interface is up.
215 ************************************************************************** */
217 static void reload_interfaces(time_t t
)
221 bool print_waiting_msg
= true;
222 struct subnet_record
*subrec
;
224 if (t
&& ((t
- lastt
) < NMBD_INTERFACES_RELOAD
)) {
230 if (!interfaces_changed()) {
236 /* the list of probed interfaces has changed, we may need to add/remove
240 /* find any interfaces that need adding */
241 for (n
=iface_count() - 1; n
>= 0; n
--) {
242 char str
[INET6_ADDRSTRLEN
];
243 const struct interface
*iface
= get_interface(n
);
244 struct in_addr ip
, nmask
;
247 DEBUG(2,("reload_interfaces: failed to get interface %d\n", n
));
251 /* Ensure we're only dealing with IPv4 here. */
252 if (iface
->ip
.ss_family
!= AF_INET
) {
253 DEBUG(2,("reload_interfaces: "
254 "ignoring non IPv4 interface.\n"));
258 ip
= ((struct sockaddr_in
*)&iface
->ip
)->sin_addr
;
259 nmask
= ((struct sockaddr_in
*)&iface
->netmask
)->sin_addr
;
262 * We don't want to add a loopback interface, in case
263 * someone has added 127.0.0.1 for smbd, nmbd needs to
264 * ignore it here. JRA.
267 if (is_loopback_addr((struct sockaddr
*)&iface
->ip
)) {
268 DEBUG(2,("reload_interfaces: Ignoring loopback "
270 print_sockaddr(str
, sizeof(str
), &iface
->ip
) ));
274 for (subrec
=subnetlist
; subrec
; subrec
=subrec
->next
) {
275 if (ip_equal_v4(ip
, subrec
->myip
) &&
276 ip_equal_v4(nmask
, subrec
->mask_ip
)) {
282 /* it wasn't found! add it */
283 DEBUG(2,("Found new interface %s\n",
285 sizeof(str
), &iface
->ip
) ));
286 subrec
= make_normal_subnet(iface
);
288 register_my_workgroup_one_subnet(subrec
);
292 /* find any interfaces that need deleting */
293 for (subrec
=subnetlist
; subrec
; subrec
=subrec
->next
) {
294 for (n
=iface_count() - 1; n
>= 0; n
--) {
295 struct interface
*iface
= get_interface(n
);
296 struct in_addr ip
, nmask
;
300 /* Ensure we're only dealing with IPv4 here. */
301 if (iface
->ip
.ss_family
!= AF_INET
) {
302 DEBUG(2,("reload_interfaces: "
303 "ignoring non IPv4 interface.\n"));
306 ip
= ((struct sockaddr_in
*)&iface
->ip
)->sin_addr
;
307 nmask
= ((struct sockaddr_in
*)&iface
->netmask
)->sin_addr
;
308 if (ip_equal_v4(ip
, subrec
->myip
) &&
309 ip_equal_v4(nmask
, subrec
->mask_ip
)) {
314 /* oops, an interface has disapeared. This is
315 tricky, we don't dare actually free the
316 interface as it could be being used, so
317 instead we just wear the memory leak and
318 remove it from the list of interfaces without
320 DEBUG(2,("Deleting dead interface %s\n",
321 inet_ntoa(subrec
->myip
)));
322 close_subnet(subrec
);
326 rescan_listen_set
= True
;
328 /* We need to wait if there are no subnets... */
329 if (FIRST_SUBNET
== NULL
) {
330 void (*saved_handler
)(int);
332 if (print_waiting_msg
) {
333 DEBUG(0,("reload_interfaces: "
334 "No subnets to listen to. Waiting..\n"));
335 print_waiting_msg
= false;
339 * Whilst we're waiting for an interface, allow SIGTERM to
342 saved_handler
= CatchSignal(SIGTERM
, SIG_DFL
);
344 /* We only count IPv4, non-loopback interfaces here. */
345 while (iface_count_v4_nl() == 0) {
350 CatchSignal(SIGTERM
, saved_handler
);
353 * We got an interface, go back to blocking term.
360 /**************************************************************************** **
361 Reload the services file.
362 **************************************************************************** */
364 static bool reload_nmbd_services(bool test
)
368 set_remote_machine_name("nmbd", False
);
371 const char *fname
= lp_configfile();
372 if (file_exist(fname
) && !strcsequal(fname
,get_dyn_CONFIGFILE())) {
373 set_dyn_CONFIGFILE(fname
);
378 if ( test
&& !lp_file_list_changed() )
381 ret
= lp_load(get_dyn_CONFIGFILE(), True
, False
, False
, True
);
383 /* perhaps the config filename is now set */
385 DEBUG( 3, ( "services not loaded\n" ) );
386 reload_nmbd_services( True
);
392 /**************************************************************************** **
393 * React on 'smbcontrol nmbd reload-config' in the same way as to SIGHUP
394 **************************************************************************** */
396 static void msg_reload_nmbd_services(struct messaging_context
*msg
,
399 struct server_id server_id
,
402 write_browse_list( 0, True
);
403 dump_all_namelists();
404 reload_nmbd_services( True
);
406 reload_interfaces(0);
409 static void msg_nmbd_send_packet(struct messaging_context
*msg
,
412 struct server_id src
,
415 struct packet_struct
*p
= (struct packet_struct
*)data
->data
;
416 struct subnet_record
*subrec
;
417 struct sockaddr_storage ss
;
418 const struct sockaddr_storage
*pss
;
419 const struct in_addr
*local_ip
;
421 DEBUG(10, ("Received send_packet from %u\n", (unsigned int)procid_to_pid(&src
)));
423 if (data
->length
!= sizeof(struct packet_struct
)) {
424 DEBUG(2, ("Discarding invalid packet length from %u\n",
425 (unsigned int)procid_to_pid(&src
)));
429 if ((p
->packet_type
!= NMB_PACKET
) &&
430 (p
->packet_type
!= DGRAM_PACKET
)) {
431 DEBUG(2, ("Discarding invalid packet type from %u: %d\n",
432 (unsigned int)procid_to_pid(&src
), p
->packet_type
));
436 in_addr_to_sockaddr_storage(&ss
, p
->ip
);
437 pss
= iface_ip((struct sockaddr
*)&ss
);
440 DEBUG(2, ("Could not find ip for packet from %u\n",
441 (unsigned int)procid_to_pid(&src
)));
445 local_ip
= &((const struct sockaddr_in
*)pss
)->sin_addr
;
446 subrec
= FIRST_SUBNET
;
449 p
->send_fd
= (p
->packet_type
== NMB_PACKET
) ?
450 subrec
->nmb_sock
: subrec
->dgram_sock
;
452 for (subrec
= FIRST_SUBNET
; subrec
!= NULL
;
453 subrec
= NEXT_SUBNET_EXCLUDING_UNICAST(subrec
)) {
454 if (ip_equal_v4(*local_ip
, subrec
->myip
)) {
455 p
->send_fd
= (p
->packet_type
== NMB_PACKET
) ?
456 subrec
->nmb_sock
: subrec
->dgram_sock
;
461 if (p
->packet_type
== DGRAM_PACKET
) {
463 p
->packet
.dgram
.header
.source_ip
.s_addr
= local_ip
->s_addr
;
464 p
->packet
.dgram
.header
.source_port
= 138;
470 /**************************************************************************** **
471 The main select loop.
472 **************************************************************************** */
474 static void process(void)
479 time_t t
= time(NULL
);
480 TALLOC_CTX
*frame
= talloc_stackframe();
483 * Check all broadcast subnets to see if
484 * we need to run an election on any of them.
488 run_election
= check_elections();
491 * Read incoming UDP packets.
495 if(listen_for_packets(run_election
)) {
501 * Process all incoming packets
502 * read above. This calls the success and
503 * failure functions registered when response
504 * packets arrrive, and also deals with request
505 * packets from other sources.
512 * Run any elections - initiate becoming
513 * a local master browser if we have won.
520 * Send out any broadcast announcements
521 * of our server names. This also announces
522 * the workgroup name if we are a local
524 * (nmbd_sendannounce.c)
527 announce_my_server_names(t
);
530 * Send out any LanMan broadcast announcements
531 * of our server names.
532 * (nmbd_sendannounce.c)
535 announce_my_lm_server_names(t
);
538 * If we are a local master browser, periodically
539 * announce ourselves to the domain master browser.
540 * This also deals with syncronising the domain master
541 * browser server lists with ourselves as a local
543 * (nmbd_sendannounce.c)
546 announce_myself_to_domain_master_browser(t
);
549 * Fullfill any remote announce requests.
550 * (nmbd_sendannounce.c)
556 * Fullfill any remote browse sync announce requests.
557 * (nmbd_sendannounce.c)
560 browse_sync_remote(t
);
563 * Scan the broadcast subnets, and WINS client
564 * namelists and refresh any that need refreshing.
571 * Scan the subnet namelists and server lists and
572 * expire thos that have timed out.
576 expire_names_and_servers(t
);
579 * Write out a snapshot of our current browse list into
580 * the browse.dat file. This is used by smbd to service
581 * incoming NetServerEnum calls - used to synchronise
582 * browse lists over subnets.
583 * (nmbd_serverlistdb.c)
586 write_browse_list(t
, False
);
589 * If we are a domain master browser, we have a list of
590 * local master browsers we should synchronise browse
591 * lists with (these are added by an incoming local
592 * master browser announcement packet). Expire any of
593 * these that are no longer current, and pull the server
594 * lists from each of these known local master browsers.
595 * (nmbd_browsesync.c)
598 dmb_expire_and_sync_browser_lists(t
);
601 * Check that there is a local master browser for our
602 * workgroup for all our broadcast subnets. If one
603 * is not found, start an election (which we ourselves
604 * may or may not participate in, depending on the
605 * setting of the 'local master' parameter.
609 check_master_browser_exists(t
);
612 * If we are configured as a logon server, attempt to
613 * register the special NetBIOS names to become such
614 * (WORKGROUP<1c> name) on all broadcast subnets and
615 * with the WINS server (if used). If we are configured
616 * to become a domain master browser, attempt to register
617 * the special NetBIOS name (WORKGROUP<1b> name) to
619 * (nmbd_become_dmb.c)
625 * If we are a WINS server, do any timer dependent
626 * processing required.
627 * (nmbd_winsserver.c)
630 initiate_wins_processing(t
);
633 * If we are a domain master browser, attempt to contact the
634 * WINS server to get a list of all known WORKGROUPS/DOMAINS.
635 * This will only work to a Samba WINS server.
636 * (nmbd_browsesync.c)
639 if (lp_enhanced_browsing())
640 collect_all_workgroup_names_from_wins_server(t
);
643 * Go through the response record queue and time out or re-transmit
644 * and expired entries.
648 retransmit_or_expire_response_records(t
);
651 * check to see if any remote browse sync child processes have completed
654 sync_check_completion();
657 * regularly sync with any other DMBs we know about
660 if (lp_enhanced_browsing())
664 * clear the unexpected packet queue
669 /* check for new network interfaces */
671 reload_interfaces(t
);
673 /* free up temp memory */
678 /**************************************************************************** **
679 Open the socket communication.
680 **************************************************************************** */
682 static bool open_sockets(bool isdaemon
, int port
)
684 struct sockaddr_storage ss
;
685 const char *sock_addr
= lp_socket_address();
688 * The sockets opened here will be used to receive broadcast
689 * packets *only*. Interface specific sockets are opened in
690 * make_subnet() in namedbsubnet.c. Thus we bind to the
691 * address "0.0.0.0". The parameter 'socket address' is
695 if (!interpret_string_addr(&ss
, sock_addr
,
696 AI_NUMERICHOST
|AI_PASSIVE
)) {
697 DEBUG(0,("open_sockets: unable to get socket address "
698 "from string %s", sock_addr
));
701 if (ss
.ss_family
!= AF_INET
) {
702 DEBUG(0,("open_sockets: unable to use IPv6 socket"
709 ClientNMB
= open_socket_in(SOCK_DGRAM
, port
,
716 if (ClientNMB
== -1) {
720 ClientDGRAM
= open_socket_in(SOCK_DGRAM
, DGRAM_PORT
,
724 if (ClientDGRAM
== -1) {
725 if (ClientNMB
!= 0) {
731 /* we are never interested in SIGPIPE */
732 BlockSignals(True
,SIGPIPE
);
734 set_socket_options( ClientNMB
, "SO_BROADCAST" );
735 set_socket_options( ClientDGRAM
, "SO_BROADCAST" );
737 /* Ensure we're non-blocking. */
738 set_blocking( ClientNMB
, False
);
739 set_blocking( ClientDGRAM
, False
);
741 DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
745 /**************************************************************************** **
747 **************************************************************************** */
749 int main(int argc
, const char *argv
[])
751 static bool is_daemon
;
752 static bool opt_interactive
;
753 static bool Fork
= true;
754 static bool no_process_group
;
755 static bool log_stdout
;
757 char *p_lmhosts
= NULL
;
763 OPT_NO_PROCESS_GROUP
,
766 struct poptOption long_options
[] = {
768 {"daemon", 'D', POPT_ARG_NONE
, NULL
, OPT_DAEMON
, "Become a daemon(default)" },
769 {"interactive", 'i', POPT_ARG_NONE
, NULL
, OPT_INTERACTIVE
, "Run interactive (not a daemon)" },
770 {"foreground", 'F', POPT_ARG_NONE
, NULL
, OPT_FORK
, "Run daemon in foreground (for daemontools & etc)" },
771 {"no-process-group", 0, POPT_ARG_NONE
, NULL
, OPT_NO_PROCESS_GROUP
, "Don't create a new process group" },
772 {"log-stdout", 'S', POPT_ARG_NONE
, NULL
, OPT_LOG_STDOUT
, "Log to stdout" },
773 {"hosts", 'H', POPT_ARG_STRING
, &p_lmhosts
, 'H', "Load a netbios hosts file"},
774 {"port", 'p', POPT_ARG_INT
, &global_nmb_port
, NMB_PORT
, "Listen on the specified port" },
778 TALLOC_CTX
*frame
= talloc_stackframe(); /* Setup tos. */
782 global_nmb_port
= NMB_PORT
;
784 pc
= poptGetContext("nmbd", argc
, argv
, long_options
, 0);
785 while ((opt
= poptGetNextOpt(pc
)) != -1) {
790 case OPT_INTERACTIVE
:
791 opt_interactive
= true;
796 case OPT_NO_PROCESS_GROUP
:
797 no_process_group
= true;
803 d_fprintf(stderr
, "\nInvalid option %s: %s\n\n",
804 poptBadOption(pc
, 0), poptStrerror(opt
));
805 poptPrintUsage(pc
, stderr
, 0);
811 global_in_nmbd
= true;
813 StartupTime
= time(NULL
);
815 sys_srandom(time(NULL
) ^ sys_getpid());
817 if (!override_logfile
) {
819 if (asprintf(&lfile
, "%s/log.nmbd", get_dyn_LOGFILEBASE()) < 0) {
822 lp_set_logfile(lfile
);
826 fault_setup((void (*)(void *))fault_continue
);
827 dump_core_setup("nmbd");
829 /* POSIX demands that signals are inherited. If the invoking process has
830 * these signals masked, we will have problems, as we won't receive them. */
831 BlockSignals(False
, SIGHUP
);
832 BlockSignals(False
, SIGUSR1
);
833 BlockSignals(False
, SIGTERM
);
836 /* we are never interested in SIGFPE */
837 BlockSignals(True
,SIGFPE
);
840 /* We no longer use USR2... */
842 BlockSignals(True
, SIGUSR2
);
845 if ( opt_interactive
) {
850 if ( log_stdout
&& Fork
) {
851 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
855 setup_logging( argv
[0], log_stdout
);
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 if (!NT_STATUS_IS_OK(reinit_after_fork(nmbd_messaging_context(),
924 nmbd_event_context(), false))) {
925 DEBUG(0,("reinit_after_fork() failed\n"));
929 if (!nmbd_setup_sig_term_handler())
931 if (!nmbd_setup_sig_hup_handler())
934 /* get broadcast messages */
936 if (!serverid_register_self(FLAG_MSG_GENERAL
|FLAG_MSG_DBWRAP
)) {
937 DEBUG(1, ("Could not register myself in serverid.tdb\n"));
941 messaging_register(nmbd_messaging_context(), NULL
,
942 MSG_FORCE_ELECTION
, nmbd_message_election
);
944 /* Until winsrepl is done. */
945 messaging_register(nmbd_messaging_context(), NULL
,
946 MSG_WINS_NEW_ENTRY
, nmbd_wins_new_entry
);
948 messaging_register(nmbd_messaging_context(), NULL
,
949 MSG_SHUTDOWN
, nmbd_terminate
);
950 messaging_register(nmbd_messaging_context(), NULL
,
951 MSG_SMB_CONF_UPDATED
, msg_reload_nmbd_services
);
952 messaging_register(nmbd_messaging_context(), NULL
,
953 MSG_SEND_PACKET
, msg_nmbd_send_packet
);
957 DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port
) );
959 if ( !open_sockets( is_daemon
, global_nmb_port
) ) {
960 kill_async_dns_child();
964 /* Determine all the IP addresses we have. */
967 /* Create an nmbd subnet record for each of the above. */
968 if( False
== create_subnets() ) {
969 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
970 kill_async_dns_child();
974 /* Load in any static local names. */
976 set_dyn_LMHOSTSFILE(p_lmhosts
);
978 load_lmhosts_file(get_dyn_LMHOSTSFILE());
979 DEBUG(3,("Loaded hosts file %s\n", get_dyn_LMHOSTSFILE()));
981 /* If we are acting as a WINS server, initialise data structures. */
982 if( !initialise_wins() ) {
983 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
984 kill_async_dns_child();
989 * Register nmbd primary workgroup and nmbd names on all
990 * the broadcast subnets, and on the WINS server (if specified).
991 * Also initiate the startup of our primary workgroup (start
992 * elections if we are setup as being able to be a local
996 if( False
== register_my_workgroup_and_names() ) {
997 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
998 kill_async_dns_child();
1002 if (!initialize_nmbd_proxy_logon()) {
1003 DEBUG(0,("ERROR: Failed setup nmbd_proxy_logon.\n"));
1004 kill_async_dns_child();
1013 kill_async_dns_child();