summaryrefslogtreecommitdiff
path: root/source3/nmbd/nmbd.c
blob: 148361f9f93484748d2031af7892b75c6a0ff20b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
/*
   Unix SMB/CIFS implementation.
   NBT netbios routines and daemon - version 2
   Copyright (C) Andrew Tridgell 1994-1998
   Copyright (C) Jeremy Allison 1997-2002
   Copyright (C) Jelmer Vernooij 2002,2003 (Conversion to popt)
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
   
*/

#include "includes.h"

int ClientNMB       = -1;
int ClientDGRAM     = -1;
int global_nmb_port = -1;

extern bool rescan_listen_set;
extern bool global_in_nmbd;

extern bool override_logfile;

/* have we found LanMan clients yet? */
bool found_lm_clients = False;

/* what server type are we currently */

time_t StartupTime = 0;

struct event_context *nmbd_event_context(void)
{
	static struct event_context *ctx;

	if (!ctx && !(ctx = event_context_init(NULL))) {
		smb_panic("Could not init nmbd event context");
	}
	return ctx;
}

struct messaging_context *nmbd_messaging_context(void)
{
	static struct messaging_context *ctx;

	if (ctx == NULL) {
		ctx = messaging_init(NULL, server_id_self(),
				     nmbd_event_context());
	}
	if (ctx == NULL) {
		DEBUG(0, ("Could not init nmbd messaging context.\n"));
	}
	return ctx;
}

/**************************************************************************** **
 Handle a SIGTERM in band.
 **************************************************************************** */

static void terminate(void)
{
	DEBUG(0,("Got SIGTERM: going down...\n"));
  
	/* Write out wins.dat file if samba is a WINS server */
	wins_write_database(0,False);
  
	/* Remove all SELF registered names from WINS */
	release_wins_names();
  
	/* Announce all server entries as 0 time-to-live, 0 type. */
	announce_my_servers_removed();

	/* If there was an async dns child - kill it. */
	kill_async_dns_child();

	gencache_stabilize();

	pidfile_unlink();

	exit(0);
}

static void nmbd_sig_term_handler(struct tevent_context *ev,
				  struct tevent_signal *se,
				  int signum,
				  int count,
				  void *siginfo,
				  void *private_data)
{
	terminate();
}

static bool nmbd_setup_sig_term_handler(void)
{
	struct tevent_signal *se;

	se = tevent_add_signal(nmbd_event_context(),
			       nmbd_event_context(),
			       SIGTERM, 0,
			       nmbd_sig_term_handler,
			       NULL);
	if (!se) {
		DEBUG(0,("failed to setup SIGTERM handler"));
		return false;
	}

	return true;
}

static void msg_reload_nmbd_services(struct messaging_context *msg,
				     void *private_data,
				     uint32_t msg_type,
				     struct server_id server_id,
				     DATA_BLOB *data);

static void nmbd_sig_hup_handler(struct tevent_context *ev,
				 struct tevent_signal *se,
				 int signum,
				 int count,
				 void *siginfo,
				 void *private_data)
{
	DEBUG(0,("Got SIGHUP dumping debug info.\n"));
	msg_reload_nmbd_services(nmbd_messaging_context(),
				 NULL, MSG_SMB_CONF_UPDATED,
				 procid_self(), NULL);
}

static bool nmbd_setup_sig_hup_handler(void)
{
	struct tevent_signal *se;

	se = tevent_add_signal(nmbd_event_context(),
			       nmbd_event_context(),
			       SIGHUP, 0,
			       nmbd_sig_hup_handler,
			       NULL);
	if (!se) {
		DEBUG(0,("failed to setup SIGHUP handler"));
		return false;
	}

	return true;
}

/**************************************************************************** **
 Handle a SHUTDOWN message from smbcontrol.
 **************************************************************************** */

static void nmbd_terminate(struct messaging_context *msg,
			   void *private_data,
			   uint32_t msg_type,
			   struct server_id server_id,
			   DATA_BLOB *data)
{
	terminate();
}

/**************************************************************************** **
 Possibly continue after a fault.
 **************************************************************************** */

static void fault_continue(void)
{
	dump_core();
}

/**************************************************************************** **
 Expire old names from the namelist and server list.
 **************************************************************************** */

static void expire_names_and_servers(time_t t)
{
	static time_t lastrun = 0;
  
	if ( !lastrun )
		lastrun = t;
	if ( t < (lastrun + 5) )
		return;
	lastrun = t;

	/*
	 * Expire any timed out names on all the broadcast
	 * subnets and those registered with the WINS server.
	 * (nmbd_namelistdb.c)
	 */

	expire_names(t);

	/*
	 * Go through all the broadcast subnets and for each
	 * workgroup known on that subnet remove any expired
	 * server names. If a workgroup has an empty serverlist
	 * and has itself timed out then remove the workgroup.
	 * (nmbd_workgroupdb.c)
	 */

	expire_workgroups_and_servers(t);
}

/************************************************************************** **
 Reload the list of network interfaces.
 Doesn't return until a network interface is up.
 ************************************************************************** */

static void reload_interfaces(time_t t)
{
	static time_t lastt;
	int n;
	bool print_waiting_msg = true;
	struct subnet_record *subrec;

	if (t && ((t - lastt) < NMBD_INTERFACES_RELOAD)) {
		return;
	}

	lastt = t;

	if (!interfaces_changed()) {
		return;
	}

  try_again:

	/* the list of probed interfaces has changed, we may need to add/remove
	   some subnets */
	load_interfaces();

	/* find any interfaces that need adding */
	for (n=iface_count() - 1; n >= 0; n--) {
		char str[INET6_ADDRSTRLEN];
		const struct interface *iface = get_interface(n);
		struct in_addr ip, nmask;

		if (!iface) {
			DEBUG(2,("reload_interfaces: failed to get interface %d\n", n));
			continue;
		}

		/* Ensure we're only dealing with IPv4 here. */
		if (iface->ip.ss_family != AF_INET) {
			DEBUG(2,("reload_interfaces: "
				"ignoring non IPv4 interface.\n"));
			continue;
		}

		ip = ((struct sockaddr_in *)&iface->ip)->sin_addr;
		nmask = ((struct sockaddr_in *)&iface->netmask)->sin_addr;

		/*
		 * We don't want to add a loopback interface, in case
		 * someone has added 127.0.0.1 for smbd, nmbd needs to
		 * ignore it here. JRA.
		 */

		if (is_loopback_addr((struct sockaddr *)&iface->ip)) {
			DEBUG(2,("reload_interfaces: Ignoring loopback "
				"interface %s\n",
				print_sockaddr(str, sizeof(str), &iface->ip) ));
			continue;
		}

		for (subrec=subnetlist; subrec; subrec=subrec->next) {
			if (ip_equal_v4(ip, subrec->myip) &&
			    ip_equal_v4(nmask, subrec->mask_ip)) {
				break;
			}
		}

		if (!subrec) {
			/* it wasn't found! add it */
			DEBUG(2,("Found new interface %s\n",
				 print_sockaddr(str,
					 sizeof(str), &iface->ip) ));
			subrec = make_normal_subnet(iface);
			if (subrec)
				register_my_workgroup_one_subnet(subrec);
		}
	}

	/* find any interfaces that need deleting */
	for (subrec=subnetlist; subrec; subrec=subrec->next) {
		for (n=iface_count() - 1; n >= 0; n--) {
			struct interface *iface = get_interface(n);
			struct in_addr ip, nmask;
			if (!iface) {
				continue;
			}
			/* Ensure we're only dealing with IPv4 here. */
			if (iface->ip.ss_family != AF_INET) {
				DEBUG(2,("reload_interfaces: "
					"ignoring non IPv4 interface.\n"));
				continue;
			}
			ip = ((struct sockaddr_in *)&iface->ip)->sin_addr;
			nmask = ((struct sockaddr_in *)&iface->netmask)->sin_addr;
			if (ip_equal_v4(ip, subrec->myip) &&
			    ip_equal_v4(nmask, subrec->mask_ip)) {
				break;
			}
		}
		if (n == -1) {
			/* oops, an interface has disapeared. This is
			 tricky, we don't dare actually free the
			 interface as it could be being used, so
			 instead we just wear the memory leak and
			 remove it from the list of interfaces without
			 freeing it */
			DEBUG(2,("Deleting dead interface %s\n",
				 inet_ntoa(subrec->myip)));
			close_subnet(subrec);
		}
	}

	rescan_listen_set = True;

	/* We need to wait if there are no subnets... */
	if (FIRST_SUBNET == NULL) {
		void (*saved_handler)(int);

		if (print_waiting_msg) {
			DEBUG(0,("reload_interfaces: "
				"No subnets to listen to. Waiting..\n"));
			print_waiting_msg = false;
		}

		/*
		 * Whilst we're waiting for an interface, allow SIGTERM to
		 * cause us to exit.
		 */
		saved_handler = CatchSignal(SIGTERM, SIG_DFL);

		/* We only count IPv4, non-loopback interfaces here. */
		while (iface_count_v4_nl() == 0) {
			sleep(5);
			load_interfaces();
		}

		CatchSignal(SIGTERM, saved_handler);

		/*
		 * We got an interface, go back to blocking term.
		 */

		goto try_again;
	}
}

/**************************************************************************** **
 Reload the services file.
 **************************************************************************** */

static bool reload_nmbd_services(bool test)
{
	bool ret;

	set_remote_machine_name("nmbd", False);

	if ( lp_loaded() ) {
		const char *fname = lp_configfile();
		if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
			set_dyn_CONFIGFILE(fname);
			test = False;
		}
	}

	if ( test && !lp_file_list_changed() )
		return(True);

	ret = lp_load(get_dyn_CONFIGFILE(), True , False, False, True);

	/* perhaps the config filename is now set */
	if ( !test ) {
		DEBUG( 3, ( "services not loaded\n" ) );
		reload_nmbd_services( True );
	}

	return(ret);
}

/**************************************************************************** **
 * React on 'smbcontrol nmbd reload-config' in the same way as to SIGHUP
 **************************************************************************** */

static void msg_reload_nmbd_services(struct messaging_context *msg,
				     void *private_data,
				     uint32_t msg_type,
				     struct server_id server_id,
				     DATA_BLOB *data)
{
	write_browse_list( 0, True );
	dump_all_namelists();
	reload_nmbd_services( True );
	reopen_logs();
	reload_interfaces(0);
}

static void msg_nmbd_send_packet(struct messaging_context *msg,
				 void *private_data,
				 uint32_t msg_type,
				 struct server_id src,
				 DATA_BLOB *data)
{
	struct packet_struct *p = (struct packet_struct *)data->data;
	struct subnet_record *subrec;
	struct sockaddr_storage ss;
	const struct sockaddr_storage *pss;
	const struct in_addr *local_ip;

	DEBUG(10, ("Received send_packet from %u\n", (unsigned int)procid_to_pid(&src)));

	if (data->length != sizeof(struct packet_struct)) {
		DEBUG(2, ("Discarding invalid packet length from %u\n",
			  (unsigned int)procid_to_pid(&src)));
		return;
	}

	if ((p->packet_type != NMB_PACKET) &&
	    (p->packet_type != DGRAM_PACKET)) {
		DEBUG(2, ("Discarding invalid packet type from %u: %d\n",
			  (unsigned int)procid_to_pid(&src), p->packet_type));
		return;
	}

	in_addr_to_sockaddr_storage(&ss, p->ip);
	pss = iface_ip((struct sockaddr *)&ss);

	if (pss == NULL) {
		DEBUG(2, ("Could not find ip for packet from %u\n",
			  (unsigned int)procid_to_pid(&src)));
		return;
	}

	local_ip = &((const struct sockaddr_in *)pss)->sin_addr;
	subrec = FIRST_SUBNET;

	p->recv_fd = -1;
	p->send_fd = (p->packet_type == NMB_PACKET) ?
		subrec->nmb_sock : subrec->dgram_sock;

	for (subrec = FIRST_SUBNET; subrec != NULL;
	     subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
		if (ip_equal_v4(*local_ip, subrec->myip)) {
			p->send_fd = (p->packet_type == NMB_PACKET) ?
				subrec->nmb_sock : subrec->dgram_sock;
			break;
		}
	}

	if (p->packet_type == DGRAM_PACKET) {
		p->port = 138;
		p->packet.dgram.header.source_ip.s_addr = local_ip->s_addr;
		p->packet.dgram.header.source_port = 138;
	}

	send_packet(p);
}

/**************************************************************************** **
 The main select loop.
 **************************************************************************** */

static void process(void)
{
	bool run_election;

	while( True ) {
		time_t t = time(NULL);
		TALLOC_CTX *frame = talloc_stackframe();

		/*
		 * Check all broadcast subnets to see if
		 * we need to run an election on any of them.
		 * (nmbd_elections.c)
		 */

		run_election = check_elections();

		/*
		 * Read incoming UDP packets.
		 * (nmbd_packets.c)
		 */

		if(listen_for_packets(run_election)) {
			TALLOC_FREE(frame);
			return;
		}

		/*
		 * Process all incoming packets
		 * read above. This calls the success and
		 * failure functions registered when response
		 * packets arrrive, and also deals with request
		 * packets from other sources.
		 * (nmbd_packets.c)
		 */

		run_packet_queue();

		/*
		 * Run any elections - initiate becoming
		 * a local master browser if we have won.
		 * (nmbd_elections.c)
		 */

		run_elections(t);

		/*
		 * Send out any broadcast announcements
		 * of our server names. This also announces
		 * the workgroup name if we are a local
		 * master browser.
		 * (nmbd_sendannounce.c)
		 */

		announce_my_server_names(t);

		/*
		 * Send out any LanMan broadcast announcements
		 * of our server names.
		 * (nmbd_sendannounce.c)
		 */

		announce_my_lm_server_names(t);

		/*
		 * If we are a local master browser, periodically
		 * announce ourselves to the domain master browser.
		 * This also deals with syncronising the domain master
		 * browser server lists with ourselves as a local
		 * master browser.
		 * (nmbd_sendannounce.c)
		 */

		announce_myself_to_domain_master_browser(t);

		/*
		 * Fullfill any remote announce requests.
		 * (nmbd_sendannounce.c)
		 */

		announce_remote(t);

		/*
		 * Fullfill any remote browse sync announce requests.
		 * (nmbd_sendannounce.c)
		 */

		browse_sync_remote(t);

		/*
		 * Scan the broadcast subnets, and WINS client
		 * namelists and refresh any that need refreshing.
		 * (nmbd_mynames.c)
		 */

		refresh_my_names(t);

		/*
		 * Scan the subnet namelists and server lists and
		 * expire thos that have timed out.
		 * (nmbd.c)
		 */

		expire_names_and_servers(t);

		/*
		 * Write out a snapshot of our current browse list into
		 * the browse.dat file. This is used by smbd to service
		 * incoming NetServerEnum calls - used to synchronise
		 * browse lists over subnets.
		 * (nmbd_serverlistdb.c)
		 */

		write_browse_list(t, False);

		/*
		 * If we are a domain master browser, we have a list of
		 * local master browsers we should synchronise browse
		 * lists with (these are added by an incoming local
		 * master browser announcement packet). Expire any of
		 * these that are no longer current, and pull the server
		 * lists from each of these known local master browsers.
		 * (nmbd_browsesync.c)
		 */

		dmb_expire_and_sync_browser_lists(t);

		/*
		 * Check that there is a local master browser for our
		 * workgroup for all our broadcast subnets. If one
		 * is not found, start an election (which we ourselves
		 * may or may not participate in, depending on the
		 * setting of the 'local master' parameter.
		 * (nmbd_elections.c)
		 */

		check_master_browser_exists(t);

		/*
		 * If we are configured as a logon server, attempt to
		 * register the special NetBIOS names to become such
		 * (WORKGROUP<1c> name) on all broadcast subnets and
		 * with the WINS server (if used). If we are configured
		 * to become a domain master browser, attempt to register
		 * the special NetBIOS name (WORKGROUP<1b> name) to
		 * become such.
		 * (nmbd_become_dmb.c)
		 */

		add_domain_names(t);

		/*
		 * If we are a WINS server, do any timer dependent
		 * processing required.
		 * (nmbd_winsserver.c)
		 */

		initiate_wins_processing(t);

		/*
		 * If we are a domain master browser, attempt to contact the
		 * WINS server to get a list of all known WORKGROUPS/DOMAINS.
		 * This will only work to a Samba WINS server.
		 * (nmbd_browsesync.c)
		 */

		if (lp_enhanced_browsing())
			collect_all_workgroup_names_from_wins_server(t);

		/*
		 * Go through the response record queue and time out or re-transmit
		 * and expired entries.
		 * (nmbd_packets.c)
		 */

		retransmit_or_expire_response_records(t);

		/*
		 * check to see if any remote browse sync child processes have completed
		 */

		sync_check_completion();

		/*
		 * regularly sync with any other DMBs we know about 
		 */

		if (lp_enhanced_browsing())
			sync_all_dmbs(t);

		/*
		 * clear the unexpected packet queue 
		 */

		clear_unexpected(t);

		/* check for new network interfaces */

		reload_interfaces(t);

		/* free up temp memory */
		TALLOC_FREE(frame);
	}
}

/**************************************************************************** **
 Open the socket communication.
 **************************************************************************** */

static bool open_sockets(bool isdaemon, int port)
{
	struct sockaddr_storage ss;
	const char *sock_addr = lp_socket_address();

	/*
	 * The sockets opened here will be used to receive broadcast
	 * packets *only*. Interface specific sockets are opened in
	 * make_subnet() in namedbsubnet.c. Thus we bind to the
	 * address "0.0.0.0". The parameter 'socket address' is
	 * now deprecated.
	 */

	if (!interpret_string_addr(&ss, sock_addr,
				AI_NUMERICHOST|AI_PASSIVE)) {
		DEBUG(0,("open_sockets: unable to get socket address "
			"from string %s", sock_addr));
		return false;
	}
	if (ss.ss_family != AF_INET) {
		DEBUG(0,("open_sockets: unable to use IPv6 socket"
			"%s in nmbd\n",
			sock_addr));
		return false;
	}

	if (isdaemon) {
		ClientNMB = open_socket_in(SOCK_DGRAM, port,
					   0, &ss,
					   true);
	} else {
		ClientNMB = 0;
	}

	if (ClientNMB == -1) {
		return false;
	}

	ClientDGRAM = open_socket_in(SOCK_DGRAM, DGRAM_PORT,
					   3, &ss,
					   true);

	if (ClientDGRAM == -1) {
		if (ClientNMB != 0) {
			close(ClientNMB);
		}
		return false;
	}

	/* we are never interested in SIGPIPE */
	BlockSignals(True,SIGPIPE);

	set_socket_options( ClientNMB,   "SO_BROADCAST" );
	set_socket_options( ClientDGRAM, "SO_BROADCAST" );

	/* Ensure we're non-blocking. */
	set_blocking( ClientNMB, False);
	set_blocking( ClientDGRAM, False);

	DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
	return( True );
}

/**************************************************************************** **
 main program
 **************************************************************************** */

 int main(int argc, const char *argv[])
{
	static bool is_daemon;
	static bool opt_interactive;
	static bool Fork = true;
	static bool no_process_group;
	static bool log_stdout;
	poptContext pc;
	char *p_lmhosts = NULL;
	int opt;
	enum {
		OPT_DAEMON = 1000,
		OPT_INTERACTIVE,
		OPT_FORK,
		OPT_NO_PROCESS_GROUP,
		OPT_LOG_STDOUT
	};
	struct poptOption long_options[] = {
	POPT_AUTOHELP
	{"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon(default)" },
	{"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)" },
	{"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools & etc)" },
	{"no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
	{"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
	{"hosts", 'H', POPT_ARG_STRING, &p_lmhosts, 'H', "Load a netbios hosts file"},
	{"port", 'p', POPT_ARG_INT, &global_nmb_port, NMB_PORT, "Listen on the specified port" },
	POPT_COMMON_SAMBA
	{ NULL }
	};
	TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */

	load_case_tables();

	global_nmb_port = NMB_PORT;

	pc = poptGetContext("nmbd", argc, argv, long_options, 0);
	while ((opt = poptGetNextOpt(pc)) != -1) {
		switch (opt) {
		case OPT_DAEMON:
			is_daemon = true;
			break;
		case OPT_INTERACTIVE:
			opt_interactive = true;
			break;
		case OPT_FORK:
			Fork = false;
			break;
		case OPT_NO_PROCESS_GROUP:
			no_process_group = true;
			break;
		case OPT_LOG_STDOUT:
			log_stdout = true;
			break;
		default:
			d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
				  poptBadOption(pc, 0), poptStrerror(opt));
			poptPrintUsage(pc, stderr, 0);
			exit(1);
		}
	};
	poptFreeContext(pc);

	global_in_nmbd = true;
	
	StartupTime = time(NULL);
	
	sys_srandom(time(NULL) ^ sys_getpid());
	
	if (!override_logfile) {
		char *lfile = NULL;
		if (asprintf(&lfile, "%s/log.nmbd", get_dyn_LOGFILEBASE()) < 0) {
			exit(1);
		}
		lp_set_logfile(lfile);
		SAFE_FREE(lfile);
	}
	
	fault_setup((void (*)(void *))fault_continue );
	dump_core_setup("nmbd");
	
	/* POSIX demands that signals are inherited. If the invoking process has
	 * these signals masked, we will have problems, as we won't receive them. */
	BlockSignals(False, SIGHUP);
	BlockSignals(False, SIGUSR1);
	BlockSignals(False, SIGTERM);

#if defined(SIGFPE)
	/* we are never interested in SIGFPE */
	BlockSignals(True,SIGFPE);
#endif

	/* We no longer use USR2... */
#if defined(SIGUSR2)
	BlockSignals(True, SIGUSR2);
#endif

	if ( opt_interactive ) {
		Fork = False;
		log_stdout = True;
	}

	if ( log_stdout && Fork ) {
		DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
		exit(1);
	}

	setup_logging( argv[0], log_stdout );

	reopen_logs();

	DEBUG(0,("nmbd version %s started.\n", samba_version_string()));
	DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));

	if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
		DEBUG(0, ("error opening config file\n"));
		exit(1);
	}

	if (nmbd_messaging_context() == NULL) {
		return 1;
	}

	if ( !reload_nmbd_services(False) )
		return(-1);

	if(!init_names())
		return -1;

	reload_nmbd_services( True );

	if (strequal(lp_workgroup(),"*")) {
		DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
		exit(1);
	}

	set_samba_nb_type();

	if (!is_daemon && !is_a_socket(0)) {
		DEBUG(0,("standard input is not a socket, assuming -D option\n"));
		is_daemon = True;
	}
  
	if (is_daemon && !opt_interactive) {
		DEBUG( 2, ( "Becoming a daemon.\n" ) );
		become_daemon(Fork, no_process_group);
	}

#if HAVE_SETPGID
	/*
	 * If we're interactive we want to set our own process group for 
	 * signal management.
	 */
	if (opt_interactive && !no_process_group)
		setpgid( (pid_t)0, (pid_t)0 );
#endif

	if (nmbd_messaging_context() == NULL) {
		return 1;
	}

#ifndef SYNC_DNS
	/* Setup the async dns. We do it here so it doesn't have all the other
		stuff initialised and thus chewing memory and sockets */
	if(lp_we_are_a_wins_server() && lp_dns_proxy()) {
		start_async_dns();
	}
#endif

	if (!directory_exist(lp_lockdir())) {
		mkdir(lp_lockdir(), 0755);
	}

	pidfile_create("nmbd");

	if (!NT_STATUS_IS_OK(reinit_after_fork(nmbd_messaging_context(),
					       nmbd_event_context(), false))) {
		DEBUG(0,("reinit_after_fork() failed\n"));
		exit(1);
	}

	if (!nmbd_setup_sig_term_handler())
		exit(1);
	if (!nmbd_setup_sig_hup_handler())
		exit(1);

	/* get broadcast messages */
	claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);

	messaging_register(nmbd_messaging_context(), NULL,
			   MSG_FORCE_ELECTION, nmbd_message_election);
#if 0
	/* Until winsrepl is done. */
	messaging_register(nmbd_messaging_context(), NULL,
			   MSG_WINS_NEW_ENTRY, nmbd_wins_new_entry);
#endif
	messaging_register(nmbd_messaging_context(), NULL,
			   MSG_SHUTDOWN, nmbd_terminate);
	messaging_register(nmbd_messaging_context(), NULL,
			   MSG_SMB_CONF_UPDATED, msg_reload_nmbd_services);
	messaging_register(nmbd_messaging_context(), NULL,
			   MSG_SEND_PACKET, msg_nmbd_send_packet);

	TimeInit();

	DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port ) );

	if ( !open_sockets( is_daemon, global_nmb_port ) ) {
		kill_async_dns_child();
		return 1;
	}

	/* Determine all the IP addresses we have. */
	load_interfaces();

	/* Create an nmbd subnet record for each of the above. */
	if( False == create_subnets() ) {
		DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
		kill_async_dns_child();
		exit(1);
	}

	/* Load in any static local names. */ 
	if (p_lmhosts) {
		set_dyn_LMHOSTSFILE(p_lmhosts);
	}
	load_lmhosts_file(get_dyn_LMHOSTSFILE());
	DEBUG(3,("Loaded hosts file %s\n", get_dyn_LMHOSTSFILE()));

	/* If we are acting as a WINS server, initialise data structures. */
	if( !initialise_wins() ) {
		DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
		kill_async_dns_child();
		exit(1);
	}

	/* 
	 * Register nmbd primary workgroup and nmbd names on all
	 * the broadcast subnets, and on the WINS server (if specified).
	 * Also initiate the startup of our primary workgroup (start
	 * elections if we are setup as being able to be a local
	 * master browser.
	 */

	if( False == register_my_workgroup_and_names() ) {
		DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
		kill_async_dns_child();
		exit(1);
	}

	if (!initialize_nmbd_proxy_logon()) {
		DEBUG(0,("ERROR: Failed setup nmbd_proxy_logon.\n"));
		kill_async_dns_child();
		exit(1);
	}

	TALLOC_FREE(frame);
	process();

	if (dbf)
		x_fclose(dbf);
	kill_async_dns_child();
	return(0);
}