summaryrefslogtreecommitdiff
path: root/source3/smbd/server.c
blob: c8b45c12c8bb8cc8619e4086b2a6fd3a591ee41c (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
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
/*
   Unix SMB/CIFS implementation.
   Main SMB server routines
   Copyright (C) Andrew Tridgell		1992-1998
   Copyright (C) Martin Pool			2002
   Copyright (C) Jelmer Vernooij		2002-2003
   Copyright (C) Volker Lendecke		1993-2007
   Copyright (C) Jeremy Allison			1993-2007

   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"
#include "system/filesys.h"
#include "popt_common.h"
#include "smbd/smbd.h"
#include "smbd/globals.h"
#include "librpc/gen_ndr/messaging.h"
#include "registry.h"
#include "registry/reg_init_full.h"
#include "libcli/auth/schannel.h"
#include "secrets.h"
#include "memcache.h"
#include "ctdbd_conn.h"
#include "printing/printer_list.h"
#include "rpc_server/rpc_ep_setup.h"
#include "printing/pcap.h"
#include "printing.h"
#include "serverid.h"
#include "passdb.h"
#include "auth.h"

extern void start_epmd(struct tevent_context *ev_ctx,
		       struct messaging_context *msg_ctx);

extern void start_spoolssd(struct event_context *ev_ctx,
			   struct messaging_context *msg_ctx);

#ifdef WITH_DFS
extern int dcelogin_atmost_once;
#endif /* WITH_DFS */

static void smbd_set_server_fd(int fd)
{
	struct smbd_server_connection *sconn = smbd_server_conn;
	char addr[INET6_ADDRSTRLEN];
	const char *name;

	sconn->sock = fd;

	/*
	 * Initialize sconn->client_id: If we can't find the client's
	 * name, default to its address.
	 */

	client_addr(fd, sconn->client_id.addr, sizeof(sconn->client_id.addr));

	name = client_name(sconn->sock);
	if (strcmp(name, "UNKNOWN") != 0) {
		name = talloc_strdup(sconn, name);
	} else {
		name = NULL;
	}
	sconn->client_id.name =
		(name != NULL) ? name : sconn->client_id.addr;

	sub_set_socket_ids(sconn->client_id.addr, sconn->client_id.name,
			   client_socket_addr(sconn->sock, addr,
					      sizeof(addr)));
}

struct event_context *smbd_event_context(void)
{
	return server_event_context();
}

/*******************************************************************
 What to do when smb.conf is updated.
 ********************************************************************/

static void smb_conf_updated(struct messaging_context *msg,
			     void *private_data,
			     uint32_t msg_type,
			     struct server_id server_id,
			     DATA_BLOB *data)
{
	struct tevent_context *ev_ctx =
		talloc_get_type_abort(private_data, struct tevent_context);

	DEBUG(10,("smb_conf_updated: Got message saying smb.conf was "
		  "updated. Reloading.\n"));
	change_to_root_user();
	reload_services(msg, smbd_server_conn->sock, False);
	if (am_parent) {
		pcap_cache_reload(ev_ctx, msg,
				  &reload_pcap_change_notify);
	}
}

/*******************************************************************
 What to do when printcap is updated.
 ********************************************************************/

static void smb_pcap_updated(struct messaging_context *msg,
			     void *private_data,
			     uint32_t msg_type,
			     struct server_id server_id,
			     DATA_BLOB *data)
{
	struct tevent_context *ev_ctx =
		talloc_get_type_abort(private_data, struct tevent_context);

	DEBUG(10,("Got message saying pcap was updated. Reloading.\n"));
	change_to_root_user();
	reload_printers(ev_ctx, msg);
}

/*******************************************************************
 Delete a statcache entry.
 ********************************************************************/

static void smb_stat_cache_delete(struct messaging_context *msg,
				  void *private_data,
				  uint32_t msg_tnype,
				  struct server_id server_id,
				  DATA_BLOB *data)
{
	const char *name = (const char *)data->data;
	DEBUG(10,("smb_stat_cache_delete: delete name %s\n", name));
	stat_cache_delete(name);
}

/****************************************************************************
  Send a SIGTERM to our process group.
*****************************************************************************/

static void  killkids(void)
{
	if(am_parent) kill(0,SIGTERM);
}

/****************************************************************************
 Process a sam sync message - not sure whether to do this here or
 somewhere else.
****************************************************************************/

static void msg_sam_sync(struct messaging_context *msg,
			 void *private_data,
			 uint32_t msg_type,
			 struct server_id server_id,
			 DATA_BLOB *data)
{
        DEBUG(10, ("** sam sync message received, ignoring\n"));
}

static void msg_exit_server(struct messaging_context *msg,
			    void *private_data,
			    uint32_t msg_type,
			    struct server_id server_id,
			    DATA_BLOB *data)
{
	DEBUG(3, ("got a SHUTDOWN message\n"));
	exit_server_cleanly(NULL);
}

#ifdef DEVELOPER
static void msg_inject_fault(struct messaging_context *msg,
			     void *private_data,
			     uint32_t msg_type,
			     struct server_id src,
			     DATA_BLOB *data)
{
	int sig;

	if (data->length != sizeof(sig)) {
		DEBUG(0, ("Process %s sent bogus signal injection request\n",
			  procid_str_static(&src)));
		return;
	}

	sig = *(int *)data->data;
	if (sig == -1) {
		exit_server("internal error injected");
		return;
	}

#if HAVE_STRSIGNAL
	DEBUG(0, ("Process %s requested injection of signal %d (%s)\n",
		  procid_str_static(&src), sig, strsignal(sig)));
#else
	DEBUG(0, ("Process %s requested injection of signal %d\n",
		  procid_str_static(&src), sig));
#endif

	kill(sys_getpid(), sig);
}
#endif /* DEVELOPER */

/*
 * Parent smbd process sets its own debug level first and then
 * sends a message to all the smbd children to adjust their debug
 * level to that of the parent.
 */

static void smbd_msg_debug(struct messaging_context *msg_ctx,
			   void *private_data,
			   uint32_t msg_type,
			   struct server_id server_id,
			   DATA_BLOB *data)
{
	struct child_pid *child;

	debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);

	for (child = children; child != NULL; child = child->next) {
		messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
				   MSG_DEBUG,
				   data->data,
				   strlen((char *) data->data) + 1);
	}
}

static void add_child_pid(pid_t pid)
{
	struct child_pid *child;

	child = SMB_MALLOC_P(struct child_pid);
	if (child == NULL) {
		DEBUG(0, ("Could not add child struct -- malloc failed\n"));
		return;
	}
	child->pid = pid;
	DLIST_ADD(children, child);
	num_children += 1;
}

/*
  at most every smbd:cleanuptime seconds (default 20), we scan the BRL
  and locking database for entries to cleanup. As a side effect this
  also cleans up dead entries in the connections database (due to the
  traversal in message_send_all()

  Using a timer for this prevents a flood of traversals when a large
  number of clients disconnect at the same time (perhaps due to a
  network outage).  
*/

static void cleanup_timeout_fn(struct event_context *event_ctx,
				struct timed_event *te,
				struct timeval now,
				void *private_data)
{
	struct timed_event **cleanup_te = (struct timed_event **)private_data;

	DEBUG(1,("Cleaning up brl and lock database after unclean shutdown\n"));
	message_send_all(smbd_messaging_context(), MSG_SMB_UNLOCK, NULL, 0, NULL);
	messaging_send_buf(smbd_messaging_context(), procid_self(),
				MSG_SMB_BRL_VALIDATE, NULL, 0);
	/* mark the cleanup as having been done */
	(*cleanup_te) = NULL;
}

static void remove_child_pid(pid_t pid, bool unclean_shutdown)
{
	struct child_pid *child;
	static struct timed_event *cleanup_te;
	struct server_id child_id;

	if (unclean_shutdown) {
		/* a child terminated uncleanly so tickle all
		   processes to see if they can grab any of the
		   pending locks
                */
		DEBUG(3,(__location__ " Unclean shutdown of pid %u\n",
			(unsigned int)pid));
		if (!cleanup_te) {
			/* call the cleanup timer, but not too often */
			int cleanup_time = lp_parm_int(-1, "smbd", "cleanuptime", 20);
			cleanup_te = event_add_timed(smbd_event_context(), NULL,
						timeval_current_ofs(cleanup_time, 0),
						cleanup_timeout_fn,
						&cleanup_te);
			DEBUG(1,("Scheduled cleanup of brl and lock database after unclean shutdown\n"));
		}
	}

	child_id = procid_self(); /* Just initialize pid and potentially vnn */
	child_id.pid = pid;

	if (!serverid_deregister(child_id)) {
		DEBUG(1, ("Could not remove pid %d from serverid.tdb\n",
			  (int)pid));
	}

	for (child = children; child != NULL; child = child->next) {
		if (child->pid == pid) {
			struct child_pid *tmp = child;
			DLIST_REMOVE(children, child);
			SAFE_FREE(tmp);
			num_children -= 1;
			return;
		}
	}

	/* not all forked child processes are added to the children list */
	DEBUG(1, ("Could not find child %d -- ignoring\n", (int)pid));
}

/****************************************************************************
 Have we reached the process limit ?
****************************************************************************/

static bool allowable_number_of_smbd_processes(void)
{
	int max_processes = lp_max_smbd_processes();

	if (!max_processes)
		return True;

	return num_children < max_processes;
}

static void smbd_sig_chld_handler(struct tevent_context *ev,
				  struct tevent_signal *se,
				  int signum,
				  int count,
				  void *siginfo,
				  void *private_data)
{
	pid_t pid;
	int status;

	while ((pid = sys_waitpid(-1, &status, WNOHANG)) > 0) {
		bool unclean_shutdown = False;

		/* If the child terminated normally, assume
		   it was an unclean shutdown unless the
		   status is 0
		*/
		if (WIFEXITED(status)) {
			unclean_shutdown = WEXITSTATUS(status);
		}
		/* If the child terminated due to a signal
		   we always assume it was unclean.
		*/
		if (WIFSIGNALED(status)) {
			unclean_shutdown = True;
		}
		remove_child_pid(pid, unclean_shutdown);
	}
}

static void smbd_setup_sig_chld_handler(void)
{
	struct tevent_signal *se;

	se = tevent_add_signal(smbd_event_context(),
			       smbd_event_context(),
			       SIGCHLD, 0,
			       smbd_sig_chld_handler,
			       NULL);
	if (!se) {
		exit_server("failed to setup SIGCHLD handler");
	}
}

struct smbd_open_socket;

struct smbd_parent_context {
	bool interactive;

	/* the list of listening sockets */
	struct smbd_open_socket *sockets;
};

struct smbd_open_socket {
	struct smbd_open_socket *prev, *next;
	struct smbd_parent_context *parent;
	int fd;
	struct tevent_fd *fde;
};

static void smbd_open_socket_close_fn(struct tevent_context *ev,
				      struct tevent_fd *fde,
				      int fd,
				      void *private_data)
{
	/* this might be the socket_wrapper swrap_close() */
	close(fd);
}

static void smbd_accept_connection(struct tevent_context *ev,
				   struct tevent_fd *fde,
				   uint16_t flags,
				   void *private_data)
{
	struct smbd_open_socket *s = talloc_get_type_abort(private_data,
				     struct smbd_open_socket);
	struct sockaddr_storage addr;
	socklen_t in_addrlen = sizeof(addr);
	int fd;
	pid_t pid = 0;
	uint64_t unique_id;

	fd = accept(s->fd, (struct sockaddr *)(void *)&addr,&in_addrlen);
	smbd_set_server_fd(fd);

	if (fd == -1 && errno == EINTR)
		return;

	if (fd == -1) {
		DEBUG(0,("open_sockets_smbd: accept: %s\n",
			 strerror(errno)));
		return;
	}

	if (s->parent->interactive) {
		smbd_process(smbd_server_conn);
		exit_server_cleanly("end of interactive mode");
		return;
	}

	if (!allowable_number_of_smbd_processes()) {
		close(fd);
		smbd_set_server_fd(-1);
		return;
	}

	/*
	 * Generate a unique id in the parent process so that we use
	 * the global random state in the parent.
	 */
	generate_random_buffer((uint8_t *)&unique_id, sizeof(unique_id));

	pid = sys_fork();
	if (pid == 0) {
		NTSTATUS status = NT_STATUS_OK;

		/* Child code ... */
		am_parent = 0;

		set_my_unique_id(unique_id);

		/* Stop zombies, the parent explicitly handles
		 * them, counting worker smbds. */
		CatchChild();

		/* close our standard file
		   descriptors */
		close_low_fds(False);

		/*
		 * Can't use TALLOC_FREE here. Nulling out the argument to it
		 * would overwrite memory we've just freed.
		 */
		talloc_free(s->parent);
		s = NULL;

		status = reinit_after_fork(smbd_messaging_context(),
					   smbd_event_context(), procid_self(),
					   true);
		if (!NT_STATUS_IS_OK(status)) {
			if (NT_STATUS_EQUAL(status,
					    NT_STATUS_TOO_MANY_OPENED_FILES)) {
				DEBUG(0,("child process cannot initialize "
					 "because too many files are open\n"));
				goto exit;
			}
			DEBUG(0,("reinit_after_fork() failed\n"));
			smb_panic("reinit_after_fork() failed");
		}

		smbd_setup_sig_term_handler();
		smbd_setup_sig_hup_handler(server_event_context(),
					   server_messaging_context());

		if (!serverid_register(procid_self(),
				       FLAG_MSG_GENERAL|FLAG_MSG_SMBD
				       |FLAG_MSG_DBWRAP
				       |FLAG_MSG_PRINT_GENERAL)) {
			exit_server_cleanly("Could not register myself in "
					    "serverid.tdb");
		}

		smbd_process(smbd_server_conn);
	 exit:
		exit_server_cleanly("end of child");
		return;
	}

	if (pid < 0) {
		DEBUG(0,("smbd_accept_connection: sys_fork() failed: %s\n",
			 strerror(errno)));
	}

	/* The parent doesn't need this socket */
	close(fd);

	/* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
		Clear the closed fd info out of server_fd --
		and more importantly, out of client_fd in
		util_sock.c, to avoid a possible
		getpeername failure if we reopen the logs
		and use %I in the filename.
	*/

	smbd_set_server_fd(-1);

	if (pid != 0) {
		add_child_pid(pid);
	}

	/* Force parent to check log size after
	 * spawning child.  Fix from
	 * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
	 * parent smbd will log to logserver.smb.  It
	 * writes only two messages for each child
	 * started/finished. But each child writes,
	 * say, 50 messages also in logserver.smb,
	 * begining with the debug_count of the
	 * parent, before the child opens its own log
	 * file logserver.client. In a worst case
	 * scenario the size of logserver.smb would be
	 * checked after about 50*50=2500 messages
	 * (ca. 100kb).
	 * */
	force_check_log_size();
}

static bool smbd_open_one_socket(struct smbd_parent_context *parent,
				 const struct sockaddr_storage *ifss,
				 uint16_t port)
{
	struct smbd_open_socket *s;

	s = talloc(parent, struct smbd_open_socket);
	if (!s) {
		return false;
	}

	s->parent = parent;
	s->fd = open_socket_in(SOCK_STREAM,
			       port,
			       parent->sockets == NULL ? 0 : 2,
			       ifss,
			       true);
	if (s->fd == -1) {
		DEBUG(0,("smbd_open_once_socket: open_socket_in: "
			"%s\n", strerror(errno)));
		TALLOC_FREE(s);
		/*
		 * We ignore an error here, as we've done before
		 */
		return true;
	}

	/* ready to listen */
	set_socket_options(s->fd, "SO_KEEPALIVE");
	set_socket_options(s->fd, lp_socket_options());

	/* Set server socket to
	 * non-blocking for the accept. */
	set_blocking(s->fd, False);

	if (listen(s->fd, SMBD_LISTEN_BACKLOG) == -1) {
		DEBUG(0,("open_sockets_smbd: listen: "
			"%s\n", strerror(errno)));
			close(s->fd);
		TALLOC_FREE(s);
		return false;
	}

	s->fde = tevent_add_fd(smbd_event_context(),
			       s,
			       s->fd, TEVENT_FD_READ,
			       smbd_accept_connection,
			       s);
	if (!s->fde) {
		DEBUG(0,("open_sockets_smbd: "
			 "tevent_add_fd: %s\n",
			 strerror(errno)));
		close(s->fd);
		TALLOC_FREE(s);
		return false;
	}
	tevent_fd_set_close_fn(s->fde, smbd_open_socket_close_fn);

	DLIST_ADD_END(parent->sockets, s, struct smbd_open_socket *);

	return true;
}

static bool smbd_parent_housekeeping(const struct timeval *now, void *private_data)
{
	time_t printcap_cache_time = (time_t)lp_printcap_cache_time();
	time_t t = time_mono(NULL);

	DEBUG(5, ("parent housekeeping\n"));

	/* if periodic printcap rescan is enabled, see if it's time to reload */
	if ((printcap_cache_time != 0)
	 && (t >= (last_printer_reload_time + printcap_cache_time))) {
		DEBUG( 3,( "Printcap cache time expired.\n"));
		pcap_cache_reload(server_event_context(),
				  smbd_messaging_context(),
				  &reload_pcap_change_notify);
		last_printer_reload_time = t;
	}

	return true;
}

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

static bool open_sockets_smbd(struct smbd_parent_context *parent,
			      struct messaging_context *msg_ctx,
			      const char *smb_ports)
{
	int num_interfaces = iface_count();
	int i;
	char *ports;
	unsigned dns_port = 0;

#ifdef HAVE_ATEXIT
	atexit(killkids);
#endif

	/* Stop zombies */
	smbd_setup_sig_chld_handler();

	/* use a reasonable default set of ports - listing on 445 and 139 */
	if (!smb_ports) {
		ports = lp_smb_ports();
		if (!ports || !*ports) {
			ports = talloc_strdup(talloc_tos(), SMB_PORTS);
		} else {
			ports = talloc_strdup(talloc_tos(), ports);
		}
	} else {
		ports = talloc_strdup(talloc_tos(), smb_ports);
	}

	if (lp_interfaces() && lp_bind_interfaces_only()) {
		/* We have been given an interfaces line, and been
		   told to only bind to those interfaces. Create a
		   socket per interface and bind to only these.
		*/

		/* Now open a listen socket for each of the
		   interfaces. */
		for(i = 0; i < num_interfaces; i++) {
			const struct sockaddr_storage *ifss =
					iface_n_sockaddr_storage(i);
			char *tok;
			const char *ptr;

			if (ifss == NULL) {
				DEBUG(0,("open_sockets_smbd: "
					"interface %d has NULL IP address !\n",
					i));
				continue;
			}

			for (ptr=ports;
			     next_token_talloc(talloc_tos(),&ptr, &tok, " \t,");) {
				unsigned port = atoi(tok);
				if (port == 0 || port > 0xffff) {
					continue;
				}

				if (!smbd_open_one_socket(parent, ifss, port)) {
					return false;
				}
			}
		}
	} else {
		/* Just bind to 0.0.0.0 - accept connections
		   from anywhere. */

		char *tok;
		const char *ptr;
		const char *sock_addr = lp_socket_address();
		char *sock_tok;
		const char *sock_ptr;

		if (strequal(sock_addr, "0.0.0.0") ||
		    strequal(sock_addr, "::")) {
#if HAVE_IPV6
			sock_addr = "::,0.0.0.0";
#else
			sock_addr = "0.0.0.0";
#endif
		}

		for (sock_ptr=sock_addr;
		     next_token_talloc(talloc_tos(), &sock_ptr, &sock_tok, " \t,"); ) {
			for (ptr=ports; next_token_talloc(talloc_tos(), &ptr, &tok, " \t,"); ) {
				struct sockaddr_storage ss;

				unsigned port = atoi(tok);
				if (port == 0 || port > 0xffff) {
					continue;
				}

				/* Keep the first port for mDNS service
				 * registration.
				 */
				if (dns_port == 0) {
					dns_port = port;
				}

				/* open an incoming socket */
				if (!interpret_string_addr(&ss, sock_tok,
						AI_NUMERICHOST|AI_PASSIVE)) {
					continue;
				}

				if (!smbd_open_one_socket(parent, &ss, port)) {
					return false;
				}
			}
		}
	}

	if (parent->sockets == NULL) {
		DEBUG(0,("open_sockets_smbd: No "
			"sockets available to bind to.\n"));
		return false;
	}

	/* Setup the main smbd so that we can get messages. Note that
	   do this after starting listening. This is needed as when in
	   clustered mode, ctdb won't allow us to start doing database
	   operations until it has gone thru a full startup, which
	   includes checking to see that smbd is listening. */

	if (!serverid_register(procid_self(),
			       FLAG_MSG_GENERAL|FLAG_MSG_SMBD
			       |FLAG_MSG_DBWRAP)) {
		DEBUG(0, ("open_sockets_smbd: Failed to register "
			  "myself in serverid.tdb\n"));
		return false;
	}

	if (!(event_add_idle(smbd_event_context(), NULL,
			     timeval_set(SMBD_HOUSEKEEPING_INTERVAL, 0),
			     "parent_housekeeping", smbd_parent_housekeeping,
			     NULL))) {
		DEBUG(0, ("Could not add parent_housekeeping event\n"));
		return false;
	}

        /* Listen to messages */

	messaging_register(msg_ctx, NULL, MSG_SMB_SAM_SYNC, msg_sam_sync);
	messaging_register(msg_ctx, NULL, MSG_SHUTDOWN, msg_exit_server);
	messaging_register(msg_ctx, NULL, MSG_SMB_FILE_RENAME,
			   msg_file_was_renamed);
	messaging_register(msg_ctx, server_event_context(), MSG_SMB_CONF_UPDATED,
			   smb_conf_updated);
	messaging_register(msg_ctx, NULL, MSG_SMB_STAT_CACHE_DELETE,
			   smb_stat_cache_delete);
	messaging_register(msg_ctx, NULL, MSG_DEBUG, smbd_msg_debug);
	messaging_register(msg_ctx, server_event_context(), MSG_PRINTER_PCAP,
			   smb_pcap_updated);
	brl_register_msgs(msg_ctx);

	msg_idmap_register_msgs(msg_ctx);

#ifdef CLUSTER_SUPPORT
	if (lp_clustering()) {
		ctdbd_register_reconfigure(messaging_ctdbd_connection());
	}
#endif

#ifdef DEVELOPER
	messaging_register(msg_ctx, NULL, MSG_SMB_INJECT_FAULT,
			   msg_inject_fault);
#endif

	if (lp_multicast_dns_register() && (dns_port != 0)) {
#ifdef WITH_DNSSD_SUPPORT
		smbd_setup_mdns_registration(smbd_event_context(),
					     parent, dns_port);
#endif
#ifdef WITH_AVAHI_SUPPORT
		void *avahi_conn;

		avahi_conn = avahi_start_register(
			smbd_event_context(), smbd_event_context(), dns_port);
		if (avahi_conn == NULL) {
			DEBUG(10, ("avahi_start_register failed\n"));
		}
#endif
	}

	return true;
}

static void smbd_parent_loop(struct smbd_parent_context *parent)
{
	/* now accept incoming connections - forking a new process
	   for each incoming connection */
	DEBUG(2,("waiting for connections\n"));
	while (1) {
		int ret;
		TALLOC_CTX *frame = talloc_stackframe();

		ret = tevent_loop_once(smbd_event_context());
		if (ret != 0) {
			exit_server_cleanly("tevent_loop_once() error");
		}

		TALLOC_FREE(frame);
	} /* end while 1 */

/* NOTREACHED	return True; */
}


/****************************************************************************
 Initialise connect, service and file structs.
****************************************************************************/

static bool init_structs(void )
{
	/*
	 * Set the machine NETBIOS name if not already
	 * set from the config file.
	 */

	if (!init_names())
		return False;

	if (!secrets_init())
		return False;

	return True;
}

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

/* Declare prototype for build_options() to avoid having to run it through
   mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
   prototype generation system is too complicated. */

extern void build_options(bool screen);

 int main(int argc,const char *argv[])
{
	/* shall I run as a daemon */
	bool is_daemon = false;
	bool interactive = false;
	bool Fork = true;
	bool no_process_group = false;
	bool log_stdout = false;
	char *ports = NULL;
	char *profile_level = NULL;
	int opt;
	poptContext pc;
	bool print_build_options = False;
        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" },
	{"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
	{"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
	{"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
	POPT_COMMON_SAMBA
	POPT_COMMON_DYNCONFIG
	POPT_TABLEEND
	};
	struct smbd_parent_context *parent = NULL;
	TALLOC_CTX *frame;
	NTSTATUS status;
	uint64_t unique_id;

	/*
	 * Do this before any other talloc operation
	 */
	talloc_enable_null_tracking();
	frame = talloc_stackframe();

	load_case_tables();

	/* Initialize the event context, it will panic on error */
	smbd_event_context();

	smbd_init_globals();

	TimeInit();

#ifdef HAVE_SET_AUTH_PARAMETERS
	set_auth_parameters(argc,argv);
#endif

	pc = poptGetContext("smbd", argc, argv, long_options, 0);
	while((opt = poptGetNextOpt(pc)) != -1) {
		switch (opt)  {
		case OPT_DAEMON:
			is_daemon = true;
			break;
		case OPT_INTERACTIVE:
			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;
		case 'b':
			print_build_options = 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);

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

	if (log_stdout) {
		setup_logging(argv[0], DEBUG_STDOUT);
	} else {
		setup_logging(argv[0], DEBUG_FILE);
	}

	if (print_build_options) {
		build_options(True); /* Display output to screen as well as debug */
		exit(0);
	}

#ifdef HAVE_SETLUID
	/* needed for SecureWare on SCO */
	setluid(0);
#endif

	set_remote_machine_name("smbd", False);

	if (interactive && (DEBUGLEVEL >= 9)) {
		talloc_enable_leak_report();
	}

	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);
	}

	/* we want to re-seed early to prevent time delays causing
           client problems at a later date. (tridge) */
	generate_random_buffer(NULL, 0);

	/* get initial effective uid and gid */
	sec_init();

	/* make absolutely sure we run as root - to handle cases where people
	   are crazy enough to have it setuid */
	gain_root_privilege();
	gain_root_group_privilege();

	fault_setup();
	dump_core_setup("smbd", lp_logfile());

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

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

#if defined(SIGUSR2)
	/* We are no longer interested in USR2 */
	BlockSignals(True,SIGUSR2);
#endif

	/* POSIX demands that signals are inherited. If the invoking process has
	 * these signals masked, we will have problems, as we won't recieve them. */
	BlockSignals(False, SIGHUP);
	BlockSignals(False, SIGUSR1);
	BlockSignals(False, SIGTERM);

	/* Ensure we leave no zombies until we
	 * correctly set up child handling below. */

	CatchChild();

	/* we want total control over the permissions on created files,
	   so set our umask to 0 */
	umask(0);

	reopen_logs();

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

	DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
		 (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));

	/* Output the build options to the debug log */ 
	build_options(False);

	if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
		DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
		exit(1);
	}

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

	/* Init the security context and global current_user */
	init_sec_ctx();

	if (smbd_messaging_context() == NULL)
		exit(1);

	/*
	 * Reloading of the printers will not work here as we don't have a
	 * server info and rpc services set up. It will be called later.
	 */
	if (!reload_services(smbd_messaging_context(), -1, False)) {
		exit(1);
	}

	/* ...NOTE... Log files are working from this point! */

	DEBUG(3,("loaded services\n"));

	init_structs();

#ifdef WITH_PROFILE
	if (!profile_setup(smbd_messaging_context(), False)) {
		DEBUG(0,("ERROR: failed to setup profiling\n"));
		return -1;
	}
	if (profile_level != NULL) {
		int pl = atoi(profile_level);
		struct server_id src;

		DEBUG(1, ("setting profiling level: %s\n",profile_level));
		src.pid = getpid();
		set_profile_level(pl, src);
	}
#endif

	if (!is_daemon && !is_a_socket(0)) {
		if (!interactive)
			DEBUG(0,("standard input is not a socket, assuming -D option\n"));

		/*
		 * Setting is_daemon here prevents us from eventually calling
		 * the open_sockets_inetd()
		 */

		is_daemon = True;
	}

	if (is_daemon && !interactive) {
		DEBUG( 3, ( "Becoming a daemon.\n" ) );
		become_daemon(Fork, no_process_group, log_stdout);
	}

        generate_random_buffer((uint8_t *)&unique_id, sizeof(unique_id));
        set_my_unique_id(unique_id);

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

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

	if (is_daemon)
		pidfile_create("smbd");

	status = reinit_after_fork(smbd_messaging_context(),
				   smbd_event_context(),
				   procid_self(), false);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0,("reinit_after_fork() failed\n"));
		exit(1);
	}

	smbd_server_conn->msg_ctx = smbd_messaging_context();

	smbd_setup_sig_term_handler();
	smbd_setup_sig_hup_handler(smbd_event_context(),
				   smbd_server_conn->msg_ctx);

	/* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */

	if (smbd_memcache() == NULL) {
		exit(1);
	}

	memcache_set_global(smbd_memcache());

	/* Initialise the password backed before the global_sam_sid
	   to ensure that we fetch from ldap before we make a domain sid up */

	if(!initialize_password_db(False, smbd_event_context()))
		exit(1);

	if (!secrets_init()) {
		DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
		exit(1);
	}

	if (lp_server_role() == ROLE_DOMAIN_BDC || lp_server_role() == ROLE_DOMAIN_PDC) {
		if (!open_schannel_session_store(NULL, lp_private_dir())) {
			DEBUG(0,("ERROR: Samba cannot open schannel store for secured NETLOGON operations.\n"));
			exit(1);
		}
	}

	if(!get_global_sam_sid()) {
		DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
		exit(1);
	}

	if (!sessionid_init()) {
		exit(1);
	}

	if (!connections_init(True))
		exit(1);

	if (!locking_init())
		exit(1);

	if (!messaging_tdb_parent_init(smbd_event_context())) {
		exit(1);
	}

	if (!notify_internal_parent_init(smbd_event_context())) {
		exit(1);
	}

	if (!serverid_parent_init(smbd_event_context())) {
		exit(1);
	}

	if (!printer_list_parent_init()) {
		exit(1);
	}

	if (!W_ERROR_IS_OK(registry_init_full()))
		exit(1);

	if (!print_backend_init(smbd_messaging_context()))
		exit(1);

	/* Open the share_info.tdb here, so we don't have to open
	   after the fork on every single connection.  This is a small
	   performance improvment and reduces the total number of system
	   fds used. */
	if (!share_info_db_init()) {
		DEBUG(0,("ERROR: failed to load share info db.\n"));
		exit(1);
	}

	status = init_system_info();
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(1, ("ERROR: failed to setup system user info: %s.\n",
			  nt_errstr(status)));
		return -1;
	}

	if (!init_guest_info()) {
		DEBUG(0,("ERROR: failed to setup guest info.\n"));
		return -1;
	}

	if (!file_init(smbd_server_conn)) {
		DEBUG(0, ("ERROR: file_init failed\n"));
		return -1;
	}

	if (is_daemon && !interactive) {
		const char *rpcsrv_type;

		rpcsrv_type = lp_parm_const_string(GLOBAL_SECTION_SNUM,
						   "rpc_server", "epmapper",
						   "none");
		if (StrCaseCmp(rpcsrv_type, "daemon") == 0) {
			start_epmd(smbd_event_context(),
				   smbd_server_conn->msg_ctx);
		}
	}

	if (!dcesrv_ep_setup(smbd_event_context(), smbd_server_conn->msg_ctx)) {
		exit(1);
	}

	/* Publish nt printers, this requires a working winreg pipe */
	pcap_cache_reload(server_event_context(), smbd_messaging_context(),
			  &reload_printers);

	/* only start the background queue daemon if we are 
	   running as a daemon -- bad things will happen if
	   smbd is launched via inetd and we fork a copy of 
	   ourselves here */

	if (is_daemon && !interactive
	    && lp_parm_bool(-1, "smbd", "backgroundqueue", true)) {
		start_background_queue(smbd_event_context(),
				       smbd_messaging_context());
	}

	if (is_daemon && !_lp_disable_spoolss()) {
		const char *rpcsrv_type;

		/* start spoolss daemon */
		/* start as a separate daemon only if enabled */
		rpcsrv_type = lp_parm_const_string(GLOBAL_SECTION_SNUM,
						   "rpc_server", "spoolss",
						   "embedded");
		if (StrCaseCmp(rpcsrv_type, "daemon") == 0) {
			start_spoolssd(smbd_event_context(),
				       smbd_messaging_context());
		}
	}

	if (!is_daemon) {
		/* inetd mode */
		TALLOC_FREE(frame);

		/* Started from inetd. fd 0 is the socket. */
		/* We will abort gracefully when the client or remote system
		   goes away */
		smbd_set_server_fd(dup(0));

		/* close our standard file descriptors */
		close_low_fds(False); /* Don't close stderr */

#ifdef HAVE_ATEXIT
		atexit(killkids);
#endif

	        /* Stop zombies */
		smbd_setup_sig_chld_handler();

		smbd_process(smbd_server_conn);

		exit_server_cleanly(NULL);
		return(0);
	}

	parent = talloc_zero(smbd_event_context(), struct smbd_parent_context);
	if (!parent) {
		exit_server("talloc(struct smbd_parent_context) failed");
	}
	parent->interactive = interactive;

	if (!open_sockets_smbd(parent, smbd_messaging_context(), ports))
		exit_server("open_sockets_smbd() failed");

	TALLOC_FREE(frame);
	/* make sure we always have a valid stackframe */
	frame = talloc_stackframe();

	smbd_parent_loop(parent);

	exit_server_cleanly(NULL);
	TALLOC_FREE(frame);
	return(0);
}