summaryrefslogtreecommitdiff
path: root/source3/nsswitch/winbindd_dual.c
blob: e89ae771c1256aa4ed475c9a0e8c5a7c6be858be (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
/* 
   Unix SMB/CIFS implementation.

   Winbind child daemons

   Copyright (C) Andrew Tridgell 2002
   Copyright (C) Volker Lendecke 2004,2005
   
   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 2 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, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/*
 * We fork a child per domain to be able to act non-blocking in the main
 * winbind daemon. A domain controller thousands of miles away being being
 * slow replying with a 10.000 user list should not hold up netlogon calls
 * that can be handled locally.
 */

#include "includes.h"
#include "winbindd.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_WINBIND

extern BOOL override_logfile;

/* Read some data from a client connection */

static void child_read_request(struct winbindd_cli_state *state)
{
	ssize_t len;

	/* Read data */

	len = read_data(state->sock, (char *)&state->request,
			sizeof(state->request));

	if (len != sizeof(state->request)) {
		DEBUG(len > 0 ? 0 : 3, ("Got invalid request length: %d\n", (int)len));
		state->finished = True;
		return;
	}

	if (state->request.extra_len == 0) {
		state->request.extra_data.data = NULL;
		return;
	}

	DEBUG(10, ("Need to read %d extra bytes\n", (int)state->request.extra_len));

	state->request.extra_data.data =
		SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);

	if (state->request.extra_data.data == NULL) {
		DEBUG(0, ("malloc failed\n"));
		state->finished = True;
		return;
	}

	/* Ensure null termination */
	state->request.extra_data.data[state->request.extra_len] = '\0';

	len = read_data(state->sock, state->request.extra_data.data,
			state->request.extra_len);

	if (len != state->request.extra_len) {
		DEBUG(0, ("Could not read extra data\n"));
		state->finished = True;
		return;
	}
}

/*
 * Machinery for async requests sent to children. You set up a
 * winbindd_request, select a child to query, and issue a async_request
 * call. When the request is completed, the callback function you specified is
 * called back with the private pointer you gave to async_request.
 */

struct winbindd_async_request {
	struct winbindd_async_request *next, *prev;
	TALLOC_CTX *mem_ctx;
	struct winbindd_child *child;
	struct winbindd_request *request;
	struct winbindd_response *response;
	void (*continuation)(void *private_data, BOOL success);
	void *private_data;
};

static void async_main_request_sent(void *private_data, BOOL success);
static void async_request_sent(void *private_data, BOOL success);
static void async_reply_recv(void *private_data, BOOL success);
static void schedule_async_request(struct winbindd_child *child);

void async_request(TALLOC_CTX *mem_ctx, struct winbindd_child *child,
		   struct winbindd_request *request,
		   struct winbindd_response *response,
		   void (*continuation)(void *private_data, BOOL success),
		   void *private_data)
{
	struct winbindd_async_request *state;

	SMB_ASSERT(continuation != NULL);

	state = TALLOC_P(mem_ctx, struct winbindd_async_request);

	if (state == NULL) {
		DEBUG(0, ("talloc failed\n"));
		continuation(private_data, False);
		return;
	}

	state->mem_ctx = mem_ctx;
	state->child = child;
	state->request = request;
	state->response = response;
	state->continuation = continuation;
	state->private_data = private_data;

	DLIST_ADD_END(child->requests, state, struct winbindd_async_request *);

	schedule_async_request(child);

	return;
}

static void async_main_request_sent(void *private_data, BOOL success)
{
	struct winbindd_async_request *state =
		talloc_get_type_abort(private_data, struct winbindd_async_request);

	if (!success) {
		DEBUG(5, ("Could not send async request\n"));

		state->response->length = sizeof(struct winbindd_response);
		state->response->result = WINBINDD_ERROR;
		state->continuation(state->private_data, False);
		return;
	}

	if (state->request->extra_len == 0) {
		async_request_sent(private_data, True);
		return;
	}

	setup_async_write(&state->child->event, state->request->extra_data.data,
			  state->request->extra_len,
			  async_request_sent, state);
}

static void async_request_sent(void *private_data_data, BOOL success)
{
	struct winbindd_async_request *state =
		talloc_get_type_abort(private_data_data, struct winbindd_async_request);

	if (!success) {
		DEBUG(5, ("Could not send async request\n"));

		state->response->length = sizeof(struct winbindd_response);
		state->response->result = WINBINDD_ERROR;
		state->continuation(state->private_data, False);
		return;
	}

	/* Request successfully sent to the child, setup the wait for reply */

	setup_async_read(&state->child->event,
			 &state->response->result,
			 sizeof(state->response->result),
			 async_reply_recv, state);
}

static void async_reply_recv(void *private_data, BOOL success)
{
	struct winbindd_async_request *state =
		talloc_get_type_abort(private_data, struct winbindd_async_request);
	struct winbindd_child *child = state->child;

	state->response->length = sizeof(struct winbindd_response);

	if (!success) {
		DEBUG(5, ("Could not receive async reply\n"));

		cache_cleanup_response(child->pid);
		DLIST_REMOVE(child->requests, state);

		state->response->result = WINBINDD_ERROR;
		state->continuation(state->private_data, False);
		return;
	}

	SMB_ASSERT(cache_retrieve_response(child->pid,
					   state->response));

	cache_cleanup_response(child->pid);
	
	DLIST_REMOVE(child->requests, state);

	schedule_async_request(child);

	state->continuation(state->private_data, True);
}

static BOOL fork_domain_child(struct winbindd_child *child);

static void schedule_async_request(struct winbindd_child *child)
{
	struct winbindd_async_request *request = child->requests;

	if (request == NULL) {
		return;
	}

	if (child->event.flags != 0) {
		return;		/* Busy */
	}

	if ((child->pid == 0) && (!fork_domain_child(child))) {
		/* Cancel all outstanding requests */

		while (request != NULL) {
			/* request might be free'd in the continuation */
			struct winbindd_async_request *next = request->next;
			request->continuation(request->private_data, False);
			request = next;
		}
		return;
	}

	setup_async_write(&child->event, request->request,
			  sizeof(*request->request),
			  async_main_request_sent, request);

	return;
}

struct domain_request_state {
	TALLOC_CTX *mem_ctx;
	struct winbindd_domain *domain;
	struct winbindd_request *request;
	struct winbindd_response *response;
	void (*continuation)(void *private_data_data, BOOL success);
	void *private_data_data;
};

static void domain_init_recv(void *private_data_data, BOOL success);

void async_domain_request(TALLOC_CTX *mem_ctx,
			  struct winbindd_domain *domain,
			  struct winbindd_request *request,
			  struct winbindd_response *response,
			  void (*continuation)(void *private_data_data, BOOL success),
			  void *private_data_data)
{
	struct domain_request_state *state;

	if (domain->initialized) {
		async_request(mem_ctx, &domain->child, request, response,
			      continuation, private_data_data);
		return;
	}

	state = TALLOC_P(mem_ctx, struct domain_request_state);
	if (state == NULL) {
		DEBUG(0, ("talloc failed\n"));
		continuation(private_data_data, False);
		return;
	}

	state->mem_ctx = mem_ctx;
	state->domain = domain;
	state->request = request;
	state->response = response;
	state->continuation = continuation;
	state->private_data_data = private_data_data;

	init_child_connection(domain, domain_init_recv, state);
}

static void recvfrom_child(void *private_data_data, BOOL success)
{
	struct winbindd_cli_state *state =
		talloc_get_type_abort(private_data_data, struct winbindd_cli_state);
	enum winbindd_result result = state->response.result;

	/* This is an optimization: The child has written directly to the
	 * response buffer. The request itself is still in pending state,
	 * state that in the result code. */

	state->response.result = WINBINDD_PENDING;

	if ((!success) || (result != WINBINDD_OK)) {
		request_error(state);
		return;
	}

	request_ok(state);
}

void sendto_child(struct winbindd_cli_state *state,
		  struct winbindd_child *child)
{
	async_request(state->mem_ctx, child, &state->request,
		      &state->response, recvfrom_child, state);
}

void sendto_domain(struct winbindd_cli_state *state,
		   struct winbindd_domain *domain)
{
	async_domain_request(state->mem_ctx, domain,
			     &state->request, &state->response,
			     recvfrom_child, state);
}

static void domain_init_recv(void *private_data_data, BOOL success)
{
	struct domain_request_state *state =
		talloc_get_type_abort(private_data_data, struct domain_request_state);

	if (!success) {
		DEBUG(5, ("Domain init returned an error\n"));
		state->continuation(state->private_data_data, False);
		return;
	}

	async_request(state->mem_ctx, &state->domain->child,
		      state->request, state->response,
		      state->continuation, state->private_data_data);
}

struct winbindd_child_dispatch_table {
	enum winbindd_cmd cmd;
	enum winbindd_result (*fn)(struct winbindd_domain *domain,
				   struct winbindd_cli_state *state);
	const char *winbindd_cmd_name;
};

static struct winbindd_child_dispatch_table child_dispatch_table[] = {
	
	{ WINBINDD_LOOKUPSID,            winbindd_dual_lookupsid,             "LOOKUPSID" },
	{ WINBINDD_LOOKUPNAME,           winbindd_dual_lookupname,            "LOOKUPNAME" },
	{ WINBINDD_LOOKUPRIDS,           winbindd_dual_lookuprids,            "LOOKUPRIDS" },
	{ WINBINDD_LIST_TRUSTDOM,        winbindd_dual_list_trusted_domains,  "LIST_TRUSTDOM" },
	{ WINBINDD_INIT_CONNECTION,      winbindd_dual_init_connection,       "INIT_CONNECTION" },
	{ WINBINDD_GETDCNAME,            winbindd_dual_getdcname,             "GETDCNAME" },
	{ WINBINDD_SHOW_SEQUENCE,        winbindd_dual_show_sequence,         "SHOW_SEQUENCE" },
	{ WINBINDD_PAM_AUTH,             winbindd_dual_pam_auth,              "PAM_AUTH" },
	{ WINBINDD_PAM_AUTH_CRAP,        winbindd_dual_pam_auth_crap,         "AUTH_CRAP" },
	{ WINBINDD_PAM_LOGOFF,           winbindd_dual_pam_logoff,            "PAM_LOGOFF" },
	{ WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP,winbindd_dual_pam_chng_pswd_auth_crap,"CHNG_PSWD_AUTH_CRAP" },
	{ WINBINDD_PAM_CHAUTHTOK,        winbindd_dual_pam_chauthtok,         "PAM_CHAUTHTOK" },
	{ WINBINDD_CHECK_MACHACC,        winbindd_dual_check_machine_acct,    "CHECK_MACHACC" },
	{ WINBINDD_DUAL_SID2UID,         winbindd_dual_sid2uid,               "DUAL_SID2UID" },
	{ WINBINDD_DUAL_SID2GID,         winbindd_dual_sid2gid,               "DUAL_SID2GID" },
#if 0   /* DISABLED until we fix the interface in Samba 3.0.26 --jerry */
	{ WINBINDD_DUAL_SIDS2XIDS,       winbindd_dual_sids2xids,             "DUAL_SIDS2XIDS" },
#endif  /* end DISABLED */
	{ WINBINDD_DUAL_UID2SID,         winbindd_dual_uid2sid,               "DUAL_UID2SID" },
	{ WINBINDD_DUAL_GID2SID,         winbindd_dual_gid2sid,               "DUAL_GID2SID" },
	{ WINBINDD_DUAL_UID2NAME,        winbindd_dual_uid2name,              "DUAL_UID2NAME" },
	{ WINBINDD_DUAL_NAME2UID,        winbindd_dual_name2uid,              "DUAL_NAME2UID" },
	{ WINBINDD_DUAL_GID2NAME,        winbindd_dual_gid2name,              "DUAL_GID2NAME" },
	{ WINBINDD_DUAL_NAME2GID,        winbindd_dual_name2gid,              "DUAL_NAME2GID" },
	{ WINBINDD_DUAL_SET_MAPPING,     winbindd_dual_set_mapping,           "DUAL_SET_MAPPING" },
	{ WINBINDD_DUAL_SET_HWM,         winbindd_dual_set_hwm,               "DUAL_SET_HWMS" },
	{ WINBINDD_DUAL_DUMP_MAPS,       winbindd_dual_dump_maps,             "DUAL_DUMP_MAPS" },
	{ WINBINDD_DUAL_USERINFO,        winbindd_dual_userinfo,              "DUAL_USERINFO" },
	{ WINBINDD_ALLOCATE_UID,         winbindd_dual_allocate_uid,          "ALLOCATE_UID" },
	{ WINBINDD_ALLOCATE_GID,         winbindd_dual_allocate_gid,          "ALLOCATE_GID" },
	{ WINBINDD_GETUSERDOMGROUPS,     winbindd_dual_getuserdomgroups,      "GETUSERDOMGROUPS" },
	{ WINBINDD_DUAL_GETSIDALIASES,   winbindd_dual_getsidaliases,         "GETSIDALIASES" },
	{ WINBINDD_CCACHE_NTLMAUTH,      winbindd_dual_ccache_ntlm_auth,      "CCACHE_NTLM_AUTH" },
	/* End of list */

	{ WINBINDD_NUM_CMDS, NULL, "NONE" }
};

static void child_process_request(struct winbindd_domain *domain,
				  struct winbindd_cli_state *state)
{
	struct winbindd_child_dispatch_table *table;

	/* Free response data - we may be interrupted and receive another
	   command before being able to send this data off. */

	state->response.result = WINBINDD_ERROR;
	state->response.length = sizeof(struct winbindd_response);

	state->mem_ctx = talloc_init("winbind request");
	if (state->mem_ctx == NULL)
		return;

	/* Process command */

	for (table = child_dispatch_table; table->fn; table++) {
		if (state->request.cmd == table->cmd) {
			DEBUG(10,("process_request: request fn %s\n",
				  table->winbindd_cmd_name ));
			state->response.result = table->fn(domain, state);
			break;
		}
	}

	if (!table->fn) {
		DEBUG(10,("process_request: unknown request fn number %d\n",
			  (int)state->request.cmd ));
		state->response.result = WINBINDD_ERROR;
	}

	talloc_destroy(state->mem_ctx);
}

void setup_domain_child(struct winbindd_domain *domain,
			struct winbindd_child *child,
			const char *explicit_logfile)
{
	if (explicit_logfile != NULL) {
		pstr_sprintf(child->logfilename, "%s/log.winbindd-%s",
			     dyn_LOGFILEBASE, explicit_logfile);
	} else if (domain != NULL) {
		pstr_sprintf(child->logfilename, "%s/log.wb-%s",
			     dyn_LOGFILEBASE, domain->name);
	} else {
		smb_panic("Internal error: domain == NULL && "
			  "explicit_logfile == NULL");
	}

	child->domain = domain;
}

struct winbindd_child *children = NULL;

void winbind_child_died(pid_t pid)
{
	struct winbindd_child *child;

	for (child = children; child != NULL; child = child->next) {
		if (child->pid == pid) {
			break;
		}
	}

	if (child == NULL) {
		DEBUG(0, ("Unknown child %d died!\n", pid));
		return;
	}

	remove_fd_event(&child->event);
	close(child->event.fd);
	child->event.fd = 0;
	child->event.flags = 0;
	child->pid = 0;

	schedule_async_request(child);
}

/* Ensure any negative cache entries with the netbios or realm names are removed. */

void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain)
{
	flush_negative_conn_cache_for_domain(domain->name);
	if (*domain->alt_name) {
		flush_negative_conn_cache_for_domain(domain->alt_name);
	}
}

/* Set our domains as offline and forward the offline message to our children. */

void winbind_msg_offline(struct messaging_context *msg_ctx,
			 void *private_data,
			 uint32_t msg_type,
			 struct server_id server_id,
			 DATA_BLOB *data)
{
	struct winbindd_child *child;
	struct winbindd_domain *domain;

	DEBUG(10,("winbind_msg_offline: got offline message.\n"));

	if (!lp_winbind_offline_logon()) {
		DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
		return;
	}

	/* Set our global state as offline. */
	if (!set_global_winbindd_state_offline()) {
		DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
		return;
	}

	/* Set all our domains as offline. */
	for (domain = domain_list(); domain; domain = domain->next) {
		if (domain->internal) {
			continue;
		}
		DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
		set_domain_offline(domain);
	}

	for (child = children; child != NULL; child = child->next) {
		/* Don't send message to idmap child.  We've already
		   done so above. */
		if (!child->domain || (child == idmap_child())) {
			continue;
		}

		/* Or internal domains (this should not be possible....) */
		if (child->domain->internal) {
			continue;
		}

		/* Each winbindd child should only process requests for one domain - make sure
		   we only set it online / offline for that domain. */

		DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
			(unsigned int)child->pid, domain->name ));

		messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
				   MSG_WINBIND_OFFLINE,
				   (uint8 *)child->domain->name,
				   strlen(child->domain->name)+1);
	}
}

/* Set our domains as online and forward the online message to our children. */

void winbind_msg_online(struct messaging_context *msg_ctx,
			void *private_data,
			uint32_t msg_type,
			struct server_id server_id,
			DATA_BLOB *data)
{
	struct winbindd_child *child;
	struct winbindd_domain *domain;

	DEBUG(10,("winbind_msg_online: got online message.\n"));

	if (!lp_winbind_offline_logon()) {
		DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
		return;
	}

	/* Set our global state as online. */
	set_global_winbindd_state_online();

	smb_nscd_flush_user_cache();
	smb_nscd_flush_group_cache();

	/* Set all our domains as online. */
	for (domain = domain_list(); domain; domain = domain->next) {
		if (domain->internal) {
			continue;
		}
		DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));

		winbindd_flush_negative_conn_cache(domain);
		set_domain_online_request(domain);

		/* Send an online message to the idmap child when our
		   primary domain comes back online */

		if ( domain->primary ) {
			struct winbindd_child *idmap = idmap_child();
			
			if ( idmap->pid != 0 ) {
				messaging_send_buf(msg_ctx,
						   pid_to_procid(idmap->pid), 
						   MSG_WINBIND_ONLINE,
						   (uint8 *)domain->name,
						   strlen(domain->name)+1);
			}
			
		}
	}

	for (child = children; child != NULL; child = child->next) {
		/* Don't send message to idmap child. */
		if (!child->domain || (child == idmap_child())) {
			continue;
		}

		/* Or internal domains (this should not be possible....) */
		if (child->domain->internal) {
			continue;
		}

		/* Each winbindd child should only process requests for one domain - make sure
		   we only set it online / offline for that domain. */

		DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
			(unsigned int)child->pid, child->domain->name ));

		messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
				   MSG_WINBIND_ONLINE,
				   (uint8 *)child->domain->name,
				   strlen(child->domain->name)+1);
	}
}

/* Forward the online/offline messages to our children. */
void winbind_msg_onlinestatus(struct messaging_context *msg_ctx,
			      void *private_data,
			      uint32_t msg_type,
			      struct server_id server_id,
			      DATA_BLOB *data)
{
	struct winbindd_child *child;

	DEBUG(10,("winbind_msg_onlinestatus: got onlinestatus message.\n"));

	for (child = children; child != NULL; child = child->next) {
		if (child->domain && child->domain->primary) {
			DEBUG(10,("winbind_msg_onlinestatus: "
				  "sending message to pid %u of primary domain.\n",
				  (unsigned int)child->pid));
			messaging_send_buf(msg_ctx, pid_to_procid(child->pid), 
					   MSG_WINBIND_ONLINESTATUS,
					   (uint8 *)data->data,
					   data->length);
			break;
		}
	}
}


static void account_lockout_policy_handler(struct event_context *ctx,
					   struct timed_event *te,
					   const struct timeval *now,
					   void *private_data)
{
	struct winbindd_child *child =
		(struct winbindd_child *)private_data;
	TALLOC_CTX *mem_ctx = NULL;
	struct winbindd_methods *methods;
	SAM_UNK_INFO_12 lockout_policy;
	NTSTATUS result;

	DEBUG(10,("account_lockout_policy_handler called\n"));

	if (child->lockout_policy_event) {
		TALLOC_FREE(child->lockout_policy_event);
	}

	if ( !winbindd_can_contact_domain( child->domain ) ) {
		DEBUG(10,("account_lockout_policy_handler: Removing myself since I "
			  "do not have an incoming trust to domain %s\n", 
			  child->domain->name));

		return;		
	}

	methods = child->domain->methods;

	mem_ctx = talloc_init("account_lockout_policy_handler ctx");
	if (!mem_ctx) {
		result = NT_STATUS_NO_MEMORY;
	} else {
		result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy);
	}

	talloc_destroy(mem_ctx);

	if (!NT_STATUS_IS_OK(result)) {
		DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
			 nt_errstr(result)));
	}

	child->lockout_policy_event = event_add_timed(winbind_event_context(), NULL,
						      timeval_current_ofs(3600, 0),
						      "account_lockout_policy_handler",
						      account_lockout_policy_handler,
						      child);
}

/* Deal with a request to go offline. */

static void child_msg_offline(struct messaging_context *msg,
			      void *private_data,
			      uint32_t msg_type,
			      struct server_id server_id,
			      DATA_BLOB *data)
{
	struct winbindd_domain *domain;
	const char *domainname = (const char *)data->data;

	if (data->data == NULL || data->length == 0) {
		return;
	}

	DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));

	if (!lp_winbind_offline_logon()) {
		DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
		return;
	}

	/* Mark the requested domain offline. */

	for (domain = domain_list(); domain; domain = domain->next) {
		if (domain->internal) {
			continue;
		}
		if (strequal(domain->name, domainname)) {
			DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
			set_domain_offline(domain);
		}
	}
}

/* Deal with a request to go online. */

static void child_msg_online(struct messaging_context *msg,
			     void *private_data,
			     uint32_t msg_type,
			     struct server_id server_id,
			     DATA_BLOB *data)
{
	struct winbindd_domain *domain;
	const char *domainname = (const char *)data->data;

	if (data->data == NULL || data->length == 0) {
		return;
	}

	DEBUG(5,("child_msg_online received for domain %s.\n", domainname));

	if (!lp_winbind_offline_logon()) {
		DEBUG(10,("child_msg_online: rejecting online message.\n"));
		return;
	}

	/* Set our global state as online. */
	set_global_winbindd_state_online();

	/* Try and mark everything online - delete any negative cache entries
	   to force a reconnect now. */

	for (domain = domain_list(); domain; domain = domain->next) {
		if (domain->internal) {
			continue;
		}
		if (strequal(domain->name, domainname)) {
			DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
			winbindd_flush_negative_conn_cache(domain);
			set_domain_online_request(domain);
		}
	}
}

static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
{
	struct winbindd_domain *domain;
	char *buf = NULL;

	if ((buf = talloc_asprintf(mem_ctx, "global:%s ", 
				   get_global_winbindd_state_offline() ? 
				   "Offline":"Online")) == NULL) {
		return NULL;
	}

	for (domain = domain_list(); domain; domain = domain->next) {
		if ((buf = talloc_asprintf_append(buf, "%s:%s ", 
						  domain->name, 
						  domain->online ?
						  "Online":"Offline")) == NULL) {
			return NULL;
		}
	}

	buf = talloc_asprintf_append(buf, "\n");

	DEBUG(5,("collect_onlinestatus: %s", buf));

	return buf;
}

static void child_msg_onlinestatus(struct messaging_context *msg_ctx,
				   void *private_data,
				   uint32_t msg_type,
				   struct server_id server_id,
				   DATA_BLOB *data)
{
	TALLOC_CTX *mem_ctx;
	const char *message;
	struct server_id *sender;
	
	DEBUG(5,("winbind_msg_onlinestatus received.\n"));

	if (!data->data) {
		return;
	}

	sender = (struct server_id *)data->data;

	mem_ctx = talloc_init("winbind_msg_onlinestatus");
	if (mem_ctx == NULL) {
		return;
	}
	
	message = collect_onlinestatus(mem_ctx);
	if (message == NULL) {
		talloc_destroy(mem_ctx);
		return;
	}

	messaging_send_buf(msg_ctx, *sender, MSG_WINBIND_ONLINESTATUS, 
			   (uint8 *)message, strlen(message) + 1);

	talloc_destroy(mem_ctx);
}

static BOOL fork_domain_child(struct winbindd_child *child)
{
	int fdpair[2];
	struct winbindd_cli_state state;
	struct winbindd_domain *domain;

	if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
		DEBUG(0, ("Could not open child pipe: %s\n",
			  strerror(errno)));
		return False;
	}

	ZERO_STRUCT(state);
	state.pid = sys_getpid();

	/* Stop zombies */
	CatchChild();

	/* Ensure we don't process messages whilst we're
	   changing the disposition for the child. */
	message_block();

	child->pid = sys_fork();

	if (child->pid == -1) {
		DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
		message_unblock();
		return False;
	}

	if (child->pid != 0) {
		/* Parent */
		close(fdpair[0]);
		child->next = child->prev = NULL;
		DLIST_ADD(children, child);
		child->event.fd = fdpair[1];
		child->event.flags = 0;
		child->requests = NULL;
		add_fd_event(&child->event);
		/* We're ok with online/offline messages now. */
		message_unblock();
		return True;
	}

	/* Child */

	state.sock = fdpair[0];
	close(fdpair[1]);

	/* tdb needs special fork handling */
	if (tdb_reopen_all(1) == -1) {
		DEBUG(0,("tdb_reopen_all failed.\n"));
		_exit(0);
	}

	close_conns_after_fork();

	if (!override_logfile) {
		lp_set_logfile(child->logfilename);
		reopen_logs();
	}

	/* Don't handle the same messages as our parent. */
	messaging_deregister(winbind_messaging_context(),
			     MSG_SMB_CONF_UPDATED, NULL);
	messaging_deregister(winbind_messaging_context(),
			     MSG_SHUTDOWN, NULL);
	messaging_deregister(winbind_messaging_context(),
			     MSG_WINBIND_OFFLINE, NULL);
	messaging_deregister(winbind_messaging_context(),
			     MSG_WINBIND_ONLINE, NULL);
	messaging_deregister(winbind_messaging_context(),
			     MSG_WINBIND_ONLINESTATUS, NULL);

	/* The child is ok with online/offline messages now. */
	message_unblock();

	/* Handle online/offline messages. */
	messaging_register(winbind_messaging_context(), NULL,
			   MSG_WINBIND_OFFLINE, child_msg_offline);
	messaging_register(winbind_messaging_context(), NULL,
			   MSG_WINBIND_ONLINE, child_msg_online);
	messaging_register(winbind_messaging_context(), NULL,
			   MSG_WINBIND_ONLINESTATUS, child_msg_onlinestatus);

	if ( child->domain ) {
		child->domain->startup = True;
		child->domain->startup_time = time(NULL);
	}

	/* Ensure we have no pending check_online events other
	   than one for this domain. */

	for (domain = domain_list(); domain; domain = domain->next) {
		if (domain != child->domain) {
			if (domain->check_online_event) {
				TALLOC_FREE(domain->check_online_event);
			}
		}
	}

	/* Ensure we're not handling an event inherited from
	   our parent. */

	cancel_named_event(winbind_event_context(),
			   "krb5_ticket_refresh_handler");

	/* We might be in the idmap child...*/
	if (child->domain && !(child->domain->internal) &&
	    lp_winbind_offline_logon()) {

		set_domain_online_request(child->domain);

		child->lockout_policy_event = event_add_timed(
			winbind_event_context(), NULL, timeval_zero(),
			"account_lockout_policy_handler",
			account_lockout_policy_handler,
			child);
	}

	while (1) {

		int ret;
		fd_set read_fds;
		struct timeval t;
		struct timeval *tp;
		struct timeval now;

		/* free up any talloc memory */
		lp_TALLOC_FREE();
		main_loop_TALLOC_FREE();

		run_events(winbind_event_context(), 0, NULL, NULL);

		GetTimeOfDay(&now);

		if (child->domain && child->domain->startup &&
				(now.tv_sec > child->domain->startup_time + 30)) {
			/* No longer in "startup" mode. */
			DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
				child->domain->name ));
			child->domain->startup = False;
		}

		tp = get_timed_events_timeout(winbind_event_context(), &t);
		if (tp) {
			DEBUG(11,("select will use timeout of %u.%u seconds\n",
				(unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec ));
		}

		/* Handle messages */

		message_dispatch();

		FD_ZERO(&read_fds);
		FD_SET(state.sock, &read_fds);

		ret = sys_select(state.sock + 1, &read_fds, NULL, NULL, tp);

		if (ret == 0) {
			DEBUG(11,("nothing is ready yet, continue\n"));
			continue;
		}

		if (ret == -1 && errno == EINTR) {
			/* We got a signal - continue. */
			continue;
		}

		if (ret == -1 && errno != EINTR) {
			DEBUG(0,("select error occured\n"));
			perror("select");
			return False;
		}

		/* fetch a request from the main daemon */
		child_read_request(&state);

		if (state.finished) {
			/* we lost contact with our parent */
			exit(0);
		}

		DEBUG(4,("child daemon request %d\n", (int)state.request.cmd));

		ZERO_STRUCT(state.response);
		state.request.null_term = '\0';
		child_process_request(child->domain, &state);

		SAFE_FREE(state.request.extra_data.data);

		cache_store_response(sys_getpid(), &state.response);

		SAFE_FREE(state.response.extra_data.data);

		/* We just send the result code back, the result
		 * structure needs to be fetched via the
		 * winbindd_cache. Hmm. That needs fixing... */

		if (write_data(state.sock,
			       (const char *)&state.response.result,
			       sizeof(state.response.result)) !=
		    sizeof(state.response.result)) {
			DEBUG(0, ("Could not write result\n"));
			exit(1);
		}
	}
}