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)
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This program is free software; you can redistribute it and/or modify
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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
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(at your option) any later version.
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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());
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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;
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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(),
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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,
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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)
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static time_t lastrun = 0;
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if ( t < (lastrun + 5) )
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* Expire any timed out names on all the broadcast
191
* subnets and those registered with the WINS server.
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* (nmbd_namelistdb.c)
198
* Go through all the broadcast subnets and for each
199
* workgroup known on that subnet remove any expired
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* 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 */
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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;
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DEBUG(2,("reload_interfaces: failed to get interface %d\n", n));
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/* 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"));
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ip = ((struct sockaddr_in *)&iface->ip)->sin_addr;
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nmask = ((struct sockaddr_in *)&iface->netmask)->sin_addr;
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* 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",
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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;
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nmask = ((struct sockaddr_in *)&iface->netmask)->sin_addr;
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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) ?
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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) ?
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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();
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* Read incoming UDP packets.
490
if(listen_for_packets(run_election)) {
496
* Process all incoming packets
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* read above. This calls the success and
498
* failure functions registered when response
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* packets arrrive, and also deals with request
500
* packets from other sources.
507
* Run any elections - initiate becoming
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* a local master browser if we have won.
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* Send out any broadcast announcements
516
* of our server names. This also announces
517
* the workgroup name if we are a local
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* (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();
998
kill_async_dns_child();