summaryrefslogtreecommitdiff
path: root/source4/rpc_server/dcerpc_server.c
blob: 1741b599294769e04f93d08240c722fe074bbc05 (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
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
/* 
   Unix SMB/CIFS implementation.

   server side dcerpc core code

   Copyright (C) Andrew Tridgell 2003-2005
   Copyright (C) Stefan (metze) Metzmacher 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 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 "auth/auth.h"
#include "auth/gensec/gensec.h"
#include "../lib/util/dlinklist.h"
#include "rpc_server/dcerpc_server.h"
#include "rpc_server/dcerpc_server_proto.h"
#include "rpc_server/common/proto.h"
#include "librpc/rpc/dcerpc_proto.h"
#include "system/filesys.h"
#include "libcli/security/security.h"
#include "param/param.h"
#include "../lib/tsocket/tsocket.h"
#include "../libcli/named_pipe_auth/npa_tstream.h"
#include "smbd/service_stream.h"
#include "../lib/tsocket/tsocket.h"
#include "lib/socket/socket.h"
#include "smbd/process_model.h"
#include "lib/messaging/irpc.h"

/* this is only used when the client asks for an unknown interface */
#define DUMMY_ASSOC_GROUP 0x0FFFFFFF

extern const struct dcesrv_interface dcesrv_mgmt_interface;


/*
  find an association group given a assoc_group_id
 */
static struct dcesrv_assoc_group *dcesrv_assoc_group_find(struct dcesrv_context *dce_ctx,
							  uint32_t id)
{
	void *id_ptr;

	id_ptr = idr_find(dce_ctx->assoc_groups_idr, id);
	if (id_ptr == NULL) {
		return NULL;
	}
	return talloc_get_type_abort(id_ptr, struct dcesrv_assoc_group);
}

/*
  take a reference to an existing association group
 */
static struct dcesrv_assoc_group *dcesrv_assoc_group_reference(TALLOC_CTX *mem_ctx,
							       struct dcesrv_context *dce_ctx,
							       uint32_t id)
{
	struct dcesrv_assoc_group *assoc_group;

	assoc_group = dcesrv_assoc_group_find(dce_ctx, id);
	if (assoc_group == NULL) {
		DEBUG(0,(__location__ ": Failed to find assoc_group 0x%08x\n", id));
		return NULL;
	}
	return talloc_reference(mem_ctx, assoc_group);
}

static int dcesrv_assoc_group_destructor(struct dcesrv_assoc_group *assoc_group)
{
	int ret;
	ret = idr_remove(assoc_group->dce_ctx->assoc_groups_idr, assoc_group->id);
	if (ret != 0) {
		DEBUG(0,(__location__ ": Failed to remove assoc_group 0x%08x\n",
			 assoc_group->id));
	}
	return 0;
}

/*
  allocate a new association group
 */
static struct dcesrv_assoc_group *dcesrv_assoc_group_new(TALLOC_CTX *mem_ctx,
							 struct dcesrv_context *dce_ctx)
{
	struct dcesrv_assoc_group *assoc_group;
	int id;

	assoc_group = talloc_zero(mem_ctx, struct dcesrv_assoc_group);
	if (assoc_group == NULL) {
		return NULL;
	}
	
	id = idr_get_new_random(dce_ctx->assoc_groups_idr, assoc_group, UINT16_MAX);
	if (id == -1) {
		talloc_free(assoc_group);
		DEBUG(0,(__location__ ": Out of association groups!\n"));
		return NULL;
	}

	assoc_group->id = id;
	assoc_group->dce_ctx = dce_ctx;

	talloc_set_destructor(assoc_group, dcesrv_assoc_group_destructor);

	return assoc_group;
}


/*
  see if two endpoints match
*/
static bool endpoints_match(const struct dcerpc_binding *ep1,
			    const struct dcerpc_binding *ep2)
{
	if (ep1->transport != ep2->transport) {
		return false;
	}

	if (!ep1->endpoint || !ep2->endpoint) {
		return ep1->endpoint == ep2->endpoint;
	}

	if (strcasecmp(ep1->endpoint, ep2->endpoint) != 0) 
		return false;

	return true;
}

/*
  find an endpoint in the dcesrv_context
*/
static struct dcesrv_endpoint *find_endpoint(struct dcesrv_context *dce_ctx,
					     const struct dcerpc_binding *ep_description)
{
	struct dcesrv_endpoint *ep;
	for (ep=dce_ctx->endpoint_list; ep; ep=ep->next) {
		if (endpoints_match(ep->ep_description, ep_description)) {
			return ep;
		}
	}
	return NULL;
}

/*
  find a registered context_id from a bind or alter_context
*/
static struct dcesrv_connection_context *dcesrv_find_context(struct dcesrv_connection *conn, 
								   uint32_t context_id)
{
	struct dcesrv_connection_context *c;
	for (c=conn->contexts;c;c=c->next) {
		if (c->context_id == context_id) return c;
	}
	return NULL;
}

/*
  see if a uuid and if_version match to an interface
*/
static bool interface_match(const struct dcesrv_interface *if1,
							const struct dcesrv_interface *if2)
{
	return (if1->syntax_id.if_version == if2->syntax_id.if_version && 
			GUID_equal(&if1->syntax_id.uuid, &if2->syntax_id.uuid));
}

/*
  find the interface operations on an endpoint
*/
static const struct dcesrv_interface *find_interface(const struct dcesrv_endpoint *endpoint,
						     const struct dcesrv_interface *iface)
{
	struct dcesrv_if_list *ifl;
	for (ifl=endpoint->interface_list; ifl; ifl=ifl->next) {
		if (interface_match(&(ifl->iface), iface)) {
			return &(ifl->iface);
		}
	}
	return NULL;
}

/*
  see if a uuid and if_version match to an interface
*/
static bool interface_match_by_uuid(const struct dcesrv_interface *iface,
				    const struct GUID *uuid, uint32_t if_version)
{
	return (iface->syntax_id.if_version == if_version && 
			GUID_equal(&iface->syntax_id.uuid, uuid));
}

/*
  find the interface operations on an endpoint by uuid
*/
static const struct dcesrv_interface *find_interface_by_uuid(const struct dcesrv_endpoint *endpoint,
							     const struct GUID *uuid, uint32_t if_version)
{
	struct dcesrv_if_list *ifl;
	for (ifl=endpoint->interface_list; ifl; ifl=ifl->next) {
		if (interface_match_by_uuid(&(ifl->iface), uuid, if_version)) {
			return &(ifl->iface);
		}
	}
	return NULL;
}

/*
  find the earlier parts of a fragmented call awaiting reassembily
*/
static struct dcesrv_call_state *dcesrv_find_fragmented_call(struct dcesrv_connection *dce_conn, uint16_t call_id)
{
	struct dcesrv_call_state *c;
	for (c=dce_conn->incoming_fragmented_call_list;c;c=c->next) {
		if (c->pkt.call_id == call_id) {
			return c;
		}
	}
	return NULL;
}

/*
  register an interface on an endpoint
*/
_PUBLIC_ NTSTATUS dcesrv_interface_register(struct dcesrv_context *dce_ctx,
				   const char *ep_name,
				   const struct dcesrv_interface *iface,
				   const struct security_descriptor *sd)
{
	struct dcesrv_endpoint *ep;
	struct dcesrv_if_list *ifl;
	struct dcerpc_binding *binding;
	bool add_ep = false;
	NTSTATUS status;
	
	status = dcerpc_parse_binding(dce_ctx, ep_name, &binding);

	if (NT_STATUS_IS_ERR(status)) {
		DEBUG(0, ("Trouble parsing binding string '%s'\n", ep_name));
		return status;
	}

	/* check if this endpoint exists
	 */
	if ((ep=find_endpoint(dce_ctx, binding))==NULL) {
		ep = talloc(dce_ctx, struct dcesrv_endpoint);
		if (!ep) {
			return NT_STATUS_NO_MEMORY;
		}
		ZERO_STRUCTP(ep);
		ep->ep_description = talloc_reference(ep, binding);
		add_ep = true;

		/* add mgmt interface */
		ifl = talloc(dce_ctx, struct dcesrv_if_list);
		if (!ifl) {
			return NT_STATUS_NO_MEMORY;
		}

		memcpy(&(ifl->iface), &dcesrv_mgmt_interface, 
			   sizeof(struct dcesrv_interface));

		DLIST_ADD(ep->interface_list, ifl);
	}

	/* see if the interface is already registered on te endpoint */
	if (find_interface(ep, iface)!=NULL) {
		DEBUG(0,("dcesrv_interface_register: interface '%s' already registered on endpoint '%s'\n",
			iface->name, ep_name));
		return NT_STATUS_OBJECT_NAME_COLLISION;
	}

	/* talloc a new interface list element */
	ifl = talloc(dce_ctx, struct dcesrv_if_list);
	if (!ifl) {
		return NT_STATUS_NO_MEMORY;
	}

	/* copy the given interface struct to the one on the endpoints interface list */
	memcpy(&(ifl->iface),iface, sizeof(struct dcesrv_interface));

	/* if we have a security descriptor given,
	 * we should see if we can set it up on the endpoint
	 */
	if (sd != NULL) {
		/* if there's currently no security descriptor given on the endpoint
		 * we try to set it
		 */
		if (ep->sd == NULL) {
			ep->sd = security_descriptor_copy(dce_ctx, sd);
		}

		/* if now there's no security descriptor given on the endpoint
		 * something goes wrong, either we failed to copy the security descriptor
		 * or there was already one on the endpoint
		 */
		if (ep->sd != NULL) {
			DEBUG(0,("dcesrv_interface_register: interface '%s' failed to setup a security descriptor\n"
			         "                           on endpoint '%s'\n",
				iface->name, ep_name));
			if (add_ep) free(ep);
			free(ifl);
			return NT_STATUS_OBJECT_NAME_COLLISION;
		}
	}

	/* finally add the interface on the endpoint */
	DLIST_ADD(ep->interface_list, ifl);

	/* if it's a new endpoint add it to the dcesrv_context */
	if (add_ep) {
		DLIST_ADD(dce_ctx->endpoint_list, ep);
	}

	DEBUG(4,("dcesrv_interface_register: interface '%s' registered on endpoint '%s'\n",
		iface->name, ep_name));

	return NT_STATUS_OK;
}

NTSTATUS dcesrv_inherited_session_key(struct dcesrv_connection *p,
				      DATA_BLOB *session_key)
{
	if (p->auth_state.session_info->session_key.length) {
		*session_key = p->auth_state.session_info->session_key;
		return NT_STATUS_OK;
	}
	return NT_STATUS_NO_USER_SESSION_KEY;
}

/*
  fetch the user session key - may be default (above) or the SMB session key

  The key is always truncated to 16 bytes 
*/
_PUBLIC_ NTSTATUS dcesrv_fetch_session_key(struct dcesrv_connection *p,
				  DATA_BLOB *session_key)
{
	NTSTATUS status = p->auth_state.session_key(p, session_key);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}

	session_key->length = MIN(session_key->length, 16);

	return NT_STATUS_OK;
}

/*
  connect to a dcerpc endpoint
*/
_PUBLIC_ NTSTATUS dcesrv_endpoint_connect(struct dcesrv_context *dce_ctx,
				 TALLOC_CTX *mem_ctx,
				 const struct dcesrv_endpoint *ep,
				 struct auth_session_info *session_info,
				 struct tevent_context *event_ctx,
				 struct messaging_context *msg_ctx,
				 struct server_id server_id,
				 uint32_t state_flags,
				 struct dcesrv_connection **_p)
{
	struct dcesrv_connection *p;

	if (!session_info) {
		return NT_STATUS_ACCESS_DENIED;
	}

	p = talloc(mem_ctx, struct dcesrv_connection);
	NT_STATUS_HAVE_NO_MEMORY(p);

	if (!talloc_reference(p, session_info)) {
		talloc_free(p);
		return NT_STATUS_NO_MEMORY;
	}

	p->dce_ctx = dce_ctx;
	p->endpoint = ep;
	p->contexts = NULL;
	p->call_list = NULL;
	p->packet_log_dir = lpcfg_lockdir(dce_ctx->lp_ctx);
	p->incoming_fragmented_call_list = NULL;
	p->pending_call_list = NULL;
	p->cli_max_recv_frag = 0;
	p->partial_input = data_blob(NULL, 0);
	p->auth_state.auth_info = NULL;
	p->auth_state.gensec_security = NULL;
	p->auth_state.session_info = session_info;
	p->auth_state.session_key = dcesrv_generic_session_key;
	p->event_ctx = event_ctx;
	p->msg_ctx = msg_ctx;
	p->server_id = server_id;
	p->processing = false;
	p->state_flags = state_flags;
	ZERO_STRUCT(p->transport);

	*_p = p;
	return NT_STATUS_OK;
}

/*
  move a call from an existing linked list to the specified list. This
  prevents bugs where we forget to remove the call from a previous
  list when moving it.
 */
static void dcesrv_call_set_list(struct dcesrv_call_state *call, 
				 enum dcesrv_call_list list)
{
	switch (call->list) {
	case DCESRV_LIST_NONE:
		break;
	case DCESRV_LIST_CALL_LIST:
		DLIST_REMOVE(call->conn->call_list, call);
		break;
	case DCESRV_LIST_FRAGMENTED_CALL_LIST:
		DLIST_REMOVE(call->conn->incoming_fragmented_call_list, call);
		break;
	case DCESRV_LIST_PENDING_CALL_LIST:
		DLIST_REMOVE(call->conn->pending_call_list, call);
		break;
	}
	call->list = list;
	switch (list) {
	case DCESRV_LIST_NONE:
		break;
	case DCESRV_LIST_CALL_LIST:
		DLIST_ADD_END(call->conn->call_list, call, struct dcesrv_call_state *);
		break;
	case DCESRV_LIST_FRAGMENTED_CALL_LIST:
		DLIST_ADD_END(call->conn->incoming_fragmented_call_list, call, struct dcesrv_call_state *);
		break;
	case DCESRV_LIST_PENDING_CALL_LIST:
		DLIST_ADD_END(call->conn->pending_call_list, call, struct dcesrv_call_state *);
		break;
	}
}


/*
  return a dcerpc bind_nak
*/
static NTSTATUS dcesrv_bind_nak(struct dcesrv_call_state *call, uint32_t reason)
{
	struct ncacn_packet pkt;
	struct data_blob_list_item *rep;
	NTSTATUS status;

	/* setup a bind_nak */
	dcesrv_init_hdr(&pkt, lpcfg_rpc_big_endian(call->conn->dce_ctx->lp_ctx));
	pkt.auth_length = 0;
	pkt.call_id = call->pkt.call_id;
	pkt.ptype = DCERPC_PKT_BIND_NAK;
	pkt.pfc_flags = DCERPC_PFC_FLAG_FIRST | DCERPC_PFC_FLAG_LAST;
	pkt.u.bind_nak.reject_reason = reason;
	if (pkt.u.bind_nak.reject_reason == DECRPC_BIND_PROTOCOL_VERSION_NOT_SUPPORTED) {
		pkt.u.bind_nak.versions.v.num_versions = 0;
	}

	rep = talloc(call, struct data_blob_list_item);
	if (!rep) {
		return NT_STATUS_NO_MEMORY;
	}

	status = ncacn_push_auth(&rep->blob, call, &pkt, NULL);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}

	dcerpc_set_frag_length(&rep->blob, rep->blob.length);

	DLIST_ADD_END(call->replies, rep, struct data_blob_list_item *);
	dcesrv_call_set_list(call, DCESRV_LIST_CALL_LIST);

	if (call->conn->call_list && call->conn->call_list->replies) {
		if (call->conn->transport.report_output_data) {
			call->conn->transport.report_output_data(call->conn);
		}
	}

	return NT_STATUS_OK;	
}

static int dcesrv_connection_context_destructor(struct dcesrv_connection_context *c)
{
	DLIST_REMOVE(c->conn->contexts, c);

	if (c->iface && c->iface->unbind) {
		c->iface->unbind(c, c->iface);
	}

	return 0;
}

/*
  handle a bind request
*/
static NTSTATUS dcesrv_bind(struct dcesrv_call_state *call)
{
	uint32_t if_version, transfer_syntax_version;
	struct GUID uuid, *transfer_syntax_uuid;
	struct ncacn_packet pkt;
	struct data_blob_list_item *rep;
	NTSTATUS status;
	uint32_t result=0, reason=0;
	uint32_t context_id;
	const struct dcesrv_interface *iface;
	uint32_t extra_flags = 0;

	/*
	  if provided, check the assoc_group is valid
	 */
	if (call->pkt.u.bind.assoc_group_id != 0 &&
	    lpcfg_parm_bool(call->conn->dce_ctx->lp_ctx, NULL, "dcesrv","assoc group checking", true) &&
	    dcesrv_assoc_group_find(call->conn->dce_ctx, call->pkt.u.bind.assoc_group_id) == NULL) {
		return dcesrv_bind_nak(call, 0);	
	}

	if (call->pkt.u.bind.num_contexts < 1 ||
	    call->pkt.u.bind.ctx_list[0].num_transfer_syntaxes < 1) {
		return dcesrv_bind_nak(call, 0);
	}

	context_id = call->pkt.u.bind.ctx_list[0].context_id;

	/* you can't bind twice on one context */
	if (dcesrv_find_context(call->conn, context_id) != NULL) {
		return dcesrv_bind_nak(call, 0);
	}

	if_version = call->pkt.u.bind.ctx_list[0].abstract_syntax.if_version;
	uuid = call->pkt.u.bind.ctx_list[0].abstract_syntax.uuid;

	transfer_syntax_version = call->pkt.u.bind.ctx_list[0].transfer_syntaxes[0].if_version;
	transfer_syntax_uuid = &call->pkt.u.bind.ctx_list[0].transfer_syntaxes[0].uuid;
	if (!GUID_equal(&ndr_transfer_syntax.uuid, transfer_syntax_uuid) != 0 ||
	    ndr_transfer_syntax.if_version != transfer_syntax_version) {
		char *uuid_str = GUID_string(call, transfer_syntax_uuid);
		/* we only do NDR encoded dcerpc */
		DEBUG(0,("Non NDR transfer syntax requested - %s\n", uuid_str));
		talloc_free(uuid_str);
		return dcesrv_bind_nak(call, 0);
	}

	iface = find_interface_by_uuid(call->conn->endpoint, &uuid, if_version);
	if (iface == NULL) {
		char *uuid_str = GUID_string(call, &uuid);
		DEBUG(2,("Request for unknown dcerpc interface %s/%d\n", uuid_str, if_version));
		talloc_free(uuid_str);

		/* we don't know about that interface */
		result = DCERPC_BIND_PROVIDER_REJECT;
		reason = DCERPC_BIND_REASON_ASYNTAX;		
	}

	if (iface) {
		/* add this context to the list of available context_ids */
		struct dcesrv_connection_context *context = talloc(call->conn, 
								   struct dcesrv_connection_context);
		if (context == NULL) {
			return dcesrv_bind_nak(call, 0);
		}
		context->conn = call->conn;
		context->iface = iface;
		context->context_id = context_id;
		if (call->pkt.u.bind.assoc_group_id != 0) {
			context->assoc_group = dcesrv_assoc_group_reference(context,
									    call->conn->dce_ctx, 
									    call->pkt.u.bind.assoc_group_id);
		} else {
			context->assoc_group = dcesrv_assoc_group_new(context, call->conn->dce_ctx);
		}
		if (context->assoc_group == NULL) {
			talloc_free(context);
			return dcesrv_bind_nak(call, 0);
		}
		context->private_data = NULL;
		DLIST_ADD(call->conn->contexts, context);
		call->context = context;
		talloc_set_destructor(context, dcesrv_connection_context_destructor);

		status = iface->bind(call, iface, if_version);
		if (!NT_STATUS_IS_OK(status)) {
			char *uuid_str = GUID_string(call, &uuid);
			DEBUG(2,("Request for dcerpc interface %s/%d rejected: %s\n",
				 uuid_str, if_version, nt_errstr(status)));
			talloc_free(uuid_str);
			/* we don't want to trigger the iface->unbind() hook */
			context->iface = NULL;
			talloc_free(call->context);
			call->context = NULL;
			return dcesrv_bind_nak(call, 0);
		}
	}

	if (call->conn->cli_max_recv_frag == 0) {
		call->conn->cli_max_recv_frag = MIN(0x2000, call->pkt.u.bind.max_recv_frag);
	}

	if ((call->pkt.pfc_flags & DCERPC_PFC_FLAG_SUPPORT_HEADER_SIGN) &&
	    lpcfg_parm_bool(call->conn->dce_ctx->lp_ctx, NULL, "dcesrv","header signing", false)) {
		call->conn->state_flags |= DCESRV_CALL_STATE_FLAG_HEADER_SIGNING;
		extra_flags |= DCERPC_PFC_FLAG_SUPPORT_HEADER_SIGN;
	}

	/* handle any authentication that is being requested */
	if (!dcesrv_auth_bind(call)) {
		talloc_free(call->context);
		call->context = NULL;
		return dcesrv_bind_nak(call, DCERPC_BIND_REASON_INVALID_AUTH_TYPE);
	}

	/* setup a bind_ack */
	dcesrv_init_hdr(&pkt, lpcfg_rpc_big_endian(call->conn->dce_ctx->lp_ctx));
	pkt.auth_length = 0;
	pkt.call_id = call->pkt.call_id;
	pkt.ptype = DCERPC_PKT_BIND_ACK;
	pkt.pfc_flags = DCERPC_PFC_FLAG_FIRST | DCERPC_PFC_FLAG_LAST | extra_flags;
	pkt.u.bind_ack.max_xmit_frag = call->conn->cli_max_recv_frag;
	pkt.u.bind_ack.max_recv_frag = 0x2000;

	/*
	  make it possible for iface->bind() to specify the assoc_group_id
	  This helps the openchange mapiproxy plugin to work correctly.
	  
	  metze
	*/
	if (call->context) {
		pkt.u.bind_ack.assoc_group_id = call->context->assoc_group->id;
	} else {
		pkt.u.bind_ack.assoc_group_id = DUMMY_ASSOC_GROUP;
	}

	if (iface) {
		/* FIXME: Use pipe name as specified by endpoint instead of interface name */
		pkt.u.bind_ack.secondary_address = talloc_asprintf(call, "\\PIPE\\%s", iface->name);
	} else {
		pkt.u.bind_ack.secondary_address = "";
	}
	pkt.u.bind_ack.num_results = 1;
	pkt.u.bind_ack.ctx_list = talloc(call, struct dcerpc_ack_ctx);
	if (!pkt.u.bind_ack.ctx_list) {
		talloc_free(call->context);
		call->context = NULL;
		return NT_STATUS_NO_MEMORY;
	}
	pkt.u.bind_ack.ctx_list[0].result = result;
	pkt.u.bind_ack.ctx_list[0].reason = reason;
	pkt.u.bind_ack.ctx_list[0].syntax = ndr_transfer_syntax;
	pkt.u.bind_ack.auth_info = data_blob(NULL, 0);

	status = dcesrv_auth_bind_ack(call, &pkt);
	if (!NT_STATUS_IS_OK(status)) {
		talloc_free(call->context);
		call->context = NULL;
		return dcesrv_bind_nak(call, 0);
	}

	rep = talloc(call, struct data_blob_list_item);
	if (!rep) {
		talloc_free(call->context);
		call->context = NULL;
		return NT_STATUS_NO_MEMORY;
	}

	status = ncacn_push_auth(&rep->blob, call, &pkt,
							 call->conn->auth_state.auth_info);
	if (!NT_STATUS_IS_OK(status)) {
		talloc_free(call->context);
		call->context = NULL;
		return status;
	}

	dcerpc_set_frag_length(&rep->blob, rep->blob.length);

	DLIST_ADD_END(call->replies, rep, struct data_blob_list_item *);
	dcesrv_call_set_list(call, DCESRV_LIST_CALL_LIST);

	if (call->conn->call_list && call->conn->call_list->replies) {
		if (call->conn->transport.report_output_data) {
			call->conn->transport.report_output_data(call->conn);
		}
	}

	return NT_STATUS_OK;
}


/*
  handle a auth3 request
*/
static NTSTATUS dcesrv_auth3(struct dcesrv_call_state *call)
{
	/* handle the auth3 in the auth code */
	if (!dcesrv_auth_auth3(call)) {
		return dcesrv_fault(call, DCERPC_FAULT_OTHER);
	}

	talloc_free(call);

	/* we don't send a reply to a auth3 request, except by a
	   fault */
	return NT_STATUS_OK;
}


/*
  handle a bind request
*/
static NTSTATUS dcesrv_alter_new_context(struct dcesrv_call_state *call, uint32_t context_id)
{
	uint32_t if_version, transfer_syntax_version;
	struct dcesrv_connection_context *context;
	const struct dcesrv_interface *iface;
	struct GUID uuid, *transfer_syntax_uuid;
	NTSTATUS status;

	if_version = call->pkt.u.alter.ctx_list[0].abstract_syntax.if_version;
	uuid = call->pkt.u.alter.ctx_list[0].abstract_syntax.uuid;

	transfer_syntax_version = call->pkt.u.alter.ctx_list[0].transfer_syntaxes[0].if_version;
	transfer_syntax_uuid = &call->pkt.u.alter.ctx_list[0].transfer_syntaxes[0].uuid;
	if (!GUID_equal(transfer_syntax_uuid, &ndr_transfer_syntax.uuid) ||
	    ndr_transfer_syntax.if_version != transfer_syntax_version) {
		/* we only do NDR encoded dcerpc */
		return NT_STATUS_RPC_PROTSEQ_NOT_SUPPORTED;
	}

	iface = find_interface_by_uuid(call->conn->endpoint, &uuid, if_version);
	if (iface == NULL) {
		char *uuid_str = GUID_string(call, &uuid);
		DEBUG(2,("Request for unknown dcerpc interface %s/%d\n", uuid_str, if_version));
		talloc_free(uuid_str);
		return NT_STATUS_RPC_PROTSEQ_NOT_SUPPORTED;
	}

	/* add this context to the list of available context_ids */
	context = talloc(call->conn, struct dcesrv_connection_context);
	if (context == NULL) {
		return NT_STATUS_NO_MEMORY;
	}
	context->conn = call->conn;
	context->iface = iface;
	context->context_id = context_id;
	if (call->pkt.u.alter.assoc_group_id != 0) {
		context->assoc_group = dcesrv_assoc_group_reference(context,
								    call->conn->dce_ctx, 
								    call->pkt.u.alter.assoc_group_id);
	} else {
		context->assoc_group = dcesrv_assoc_group_new(context, call->conn->dce_ctx);
	}
	if (context->assoc_group == NULL) {
		talloc_free(context);
		call->context = NULL;
		return NT_STATUS_NO_MEMORY;
	}
	context->private_data = NULL;
	DLIST_ADD(call->conn->contexts, context);
	call->context = context;
	talloc_set_destructor(context, dcesrv_connection_context_destructor);

	status = iface->bind(call, iface, if_version);
	if (!NT_STATUS_IS_OK(status)) {
		/* we don't want to trigger the iface->unbind() hook */
		context->iface = NULL;
		talloc_free(context);
		call->context = NULL;
		return status;
	}

	return NT_STATUS_OK;
}


/*
  handle a alter context request
*/
static NTSTATUS dcesrv_alter(struct dcesrv_call_state *call)
{
	struct ncacn_packet pkt;
	struct data_blob_list_item *rep;
	NTSTATUS status;
	uint32_t result=0, reason=0;
	uint32_t context_id;

	/* handle any authentication that is being requested */
	if (!dcesrv_auth_alter(call)) {
		/* TODO: work out the right reject code */
		result = DCERPC_BIND_PROVIDER_REJECT;
		reason = DCERPC_BIND_REASON_ASYNTAX;		
	}

	context_id = call->pkt.u.alter.ctx_list[0].context_id;

	/* see if they are asking for a new interface */
	if (result == 0) {
		call->context = dcesrv_find_context(call->conn, context_id);
		if (!call->context) {
			status = dcesrv_alter_new_context(call, context_id);
			if (!NT_STATUS_IS_OK(status)) {
				result = DCERPC_BIND_PROVIDER_REJECT;
				reason = DCERPC_BIND_REASON_ASYNTAX;
			}
		}
	}

	if (result == 0 &&
	    call->pkt.u.alter.assoc_group_id != 0 &&
	    lpcfg_parm_bool(call->conn->dce_ctx->lp_ctx, NULL, "dcesrv","assoc group checking", true) &&
	    call->pkt.u.alter.assoc_group_id != call->context->assoc_group->id) {
		DEBUG(0,(__location__ ": Failed attempt to use new assoc_group in alter context (0x%08x 0x%08x)\n",
			 call->context->assoc_group->id, call->pkt.u.alter.assoc_group_id));
		/* TODO: can they ask for a new association group? */
		result = DCERPC_BIND_PROVIDER_REJECT;
		reason = DCERPC_BIND_REASON_ASYNTAX;
	}

	/* setup a alter_resp */
	dcesrv_init_hdr(&pkt, lpcfg_rpc_big_endian(call->conn->dce_ctx->lp_ctx));
	pkt.auth_length = 0;
	pkt.call_id = call->pkt.call_id;
	pkt.ptype = DCERPC_PKT_ALTER_RESP;
	pkt.pfc_flags = DCERPC_PFC_FLAG_FIRST | DCERPC_PFC_FLAG_LAST;
	pkt.u.alter_resp.max_xmit_frag = 0x2000;
	pkt.u.alter_resp.max_recv_frag = 0x2000;
	if (result == 0) {
		pkt.u.alter_resp.assoc_group_id = call->context->assoc_group->id;
	} else {
		pkt.u.alter_resp.assoc_group_id = 0;
	}
	pkt.u.alter_resp.num_results = 1;
	pkt.u.alter_resp.ctx_list = talloc_array(call, struct dcerpc_ack_ctx, 1);
	if (!pkt.u.alter_resp.ctx_list) {
		return NT_STATUS_NO_MEMORY;
	}
	pkt.u.alter_resp.ctx_list[0].result = result;
	pkt.u.alter_resp.ctx_list[0].reason = reason;
	pkt.u.alter_resp.ctx_list[0].syntax = ndr_transfer_syntax;
	pkt.u.alter_resp.auth_info = data_blob(NULL, 0);
	pkt.u.alter_resp.secondary_address = "";

	status = dcesrv_auth_alter_ack(call, &pkt);
	if (!NT_STATUS_IS_OK(status)) {
		if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)
		    || NT_STATUS_EQUAL(status, NT_STATUS_LOGON_FAILURE)
		    || NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_USER)
		    || NT_STATUS_EQUAL(status, NT_STATUS_WRONG_PASSWORD)) {
			return dcesrv_fault(call, DCERPC_FAULT_ACCESS_DENIED);
		}
		return dcesrv_fault(call, 0);
	}

	rep = talloc(call, struct data_blob_list_item);
	if (!rep) {
		return NT_STATUS_NO_MEMORY;
	}

	status = ncacn_push_auth(&rep->blob, call, &pkt, call->conn->auth_state.auth_info);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}

	dcerpc_set_frag_length(&rep->blob, rep->blob.length);

	DLIST_ADD_END(call->replies, rep, struct data_blob_list_item *);
	dcesrv_call_set_list(call, DCESRV_LIST_CALL_LIST);

	if (call->conn->call_list && call->conn->call_list->replies) {
		if (call->conn->transport.report_output_data) {
			call->conn->transport.report_output_data(call->conn);
		}
	}

	return NT_STATUS_OK;
}

/*
  possibly save the call for inspection with ndrdump
 */
static void dcesrv_save_call(struct dcesrv_call_state *call, const char *why)
{
#ifdef DEVELOPER
	char *fname;
	const char *dump_dir;
	dump_dir = lpcfg_parm_string(call->conn->dce_ctx->lp_ctx, NULL, "dcesrv", "stubs directory");
	if (!dump_dir) {
		return;
	}
	fname = talloc_asprintf(call, "%s/RPC-%s-%u-%s.dat",
				dump_dir,
				call->context->iface->name,
				call->pkt.u.request.opnum,
				why);
	if (file_save(fname, call->pkt.u.request.stub_and_verifier.data, call->pkt.u.request.stub_and_verifier.length)) {
		DEBUG(0,("RPC SAVED %s\n", fname));
	}
	talloc_free(fname);
#endif
}

/*
  handle a dcerpc request packet
*/
static NTSTATUS dcesrv_request(struct dcesrv_call_state *call)
{
	struct ndr_pull *pull;
	NTSTATUS status;
	struct dcesrv_connection_context *context;

	/* if authenticated, and the mech we use can't do async replies, don't use them... */
	if (call->conn->auth_state.gensec_security && 
	    !gensec_have_feature(call->conn->auth_state.gensec_security, GENSEC_FEATURE_ASYNC_REPLIES)) {
		call->state_flags &= ~DCESRV_CALL_STATE_FLAG_MAY_ASYNC;
	}

	context = dcesrv_find_context(call->conn, call->pkt.u.request.context_id);
	if (context == NULL) {
		return dcesrv_fault(call, DCERPC_FAULT_UNK_IF);
	}

	pull = ndr_pull_init_blob(&call->pkt.u.request.stub_and_verifier, call);
	NT_STATUS_HAVE_NO_MEMORY(pull);

	pull->flags |= LIBNDR_FLAG_REF_ALLOC;

	call->context	= context;
	call->ndr_pull	= pull;

	if (!(call->pkt.drep[0] & DCERPC_DREP_LE)) {
		pull->flags |= LIBNDR_FLAG_BIGENDIAN;
	}

	/* unravel the NDR for the packet */
	status = context->iface->ndr_pull(call, call, pull, &call->r);
	if (!NT_STATUS_IS_OK(status)) {
		if (call->fault_code == DCERPC_FAULT_OP_RNG_ERROR) {
			/* we got an unknown call */
			DEBUG(3,(__location__ ": Unknown RPC call %u on %s\n",
				 call->pkt.u.request.opnum, context->iface->name));
			dcesrv_save_call(call, "unknown");
		} else {
			dcesrv_save_call(call, "pullfail");
		}
		return dcesrv_fault(call, call->fault_code);
	}

	if (pull->offset != pull->data_size) {
		dcesrv_save_call(call, "extrabytes");
		DEBUG(3,("Warning: %d extra bytes in incoming RPC request\n", 
			 pull->data_size - pull->offset));
	}

	/* call the dispatch function */
	status = context->iface->dispatch(call, call, call->r);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(5,("dcerpc fault in call %s:%02x - %s\n",
			 context->iface->name, 
			 call->pkt.u.request.opnum,
			 dcerpc_errstr(pull, call->fault_code)));
		return dcesrv_fault(call, call->fault_code);
	}

	/* add the call to the pending list */
	dcesrv_call_set_list(call, DCESRV_LIST_PENDING_CALL_LIST);

	if (call->state_flags & DCESRV_CALL_STATE_FLAG_ASYNC) {
		return NT_STATUS_OK;
	}

	return dcesrv_reply(call);
}


/*
  remove the call from the right list when freed
 */
static int dcesrv_call_dequeue(struct dcesrv_call_state *call)
{
	dcesrv_call_set_list(call, DCESRV_LIST_NONE);
	return 0;
}

_PUBLIC_ const struct tsocket_address *dcesrv_connection_get_local_address(struct dcesrv_connection *conn)
{
	return conn->local_address;
}

_PUBLIC_ const struct tsocket_address *dcesrv_connection_get_remote_address(struct dcesrv_connection *conn)
{
	return conn->remote_address;
}

/*
  process some input to a dcerpc endpoint server.
*/
NTSTATUS dcesrv_process_ncacn_packet(struct dcesrv_connection *dce_conn,
				     struct ncacn_packet *pkt,
				     DATA_BLOB blob)
{
	NTSTATUS status;
	struct dcesrv_call_state *call;

	call = talloc_zero(dce_conn, struct dcesrv_call_state);
	if (!call) {
		data_blob_free(&blob);
		talloc_free(pkt);
		return NT_STATUS_NO_MEMORY;
	}
	call->conn		= dce_conn;
	call->event_ctx		= dce_conn->event_ctx;
	call->msg_ctx		= dce_conn->msg_ctx;
	call->state_flags	= call->conn->state_flags;
	call->time		= timeval_current();
	call->list              = DCESRV_LIST_NONE;

	talloc_steal(call, pkt);
	talloc_steal(call, blob.data);
	call->pkt = *pkt;

	talloc_set_destructor(call, dcesrv_call_dequeue);

	/* we have to check the signing here, before combining the
	   pdus */
	if (call->pkt.ptype == DCERPC_PKT_REQUEST &&
	    !dcesrv_auth_request(call, &blob)) {
		return dcesrv_fault(call, DCERPC_FAULT_ACCESS_DENIED);		
	}

	/* see if this is a continued packet */
	if (call->pkt.ptype == DCERPC_PKT_REQUEST &&
	    !(call->pkt.pfc_flags & DCERPC_PFC_FLAG_FIRST)) {
		struct dcesrv_call_state *call2 = call;
		uint32_t alloc_size;

		/* we only allow fragmented requests, no other packet types */
		if (call->pkt.ptype != DCERPC_PKT_REQUEST) {
			return dcesrv_fault(call2, DCERPC_FAULT_OTHER);
		}

		/* this is a continuation of an existing call - find the call then
		   tack it on the end */
		call = dcesrv_find_fragmented_call(dce_conn, call2->pkt.call_id);
		if (!call) {
			return dcesrv_fault(call2, DCERPC_FAULT_OTHER);
		}

		if (call->pkt.ptype != call2->pkt.ptype) {
			/* trying to play silly buggers are we? */
			return dcesrv_fault(call2, DCERPC_FAULT_OTHER);
		}

		alloc_size = call->pkt.u.request.stub_and_verifier.length +
			call2->pkt.u.request.stub_and_verifier.length;
		if (call->pkt.u.request.alloc_hint > alloc_size) {
			alloc_size = call->pkt.u.request.alloc_hint;
		}

		call->pkt.u.request.stub_and_verifier.data = 
			talloc_realloc(call, 
				       call->pkt.u.request.stub_and_verifier.data, 
				       uint8_t, alloc_size);
		if (!call->pkt.u.request.stub_and_verifier.data) {
			return dcesrv_fault(call2, DCERPC_FAULT_OTHER);
		}
		memcpy(call->pkt.u.request.stub_and_verifier.data +
		       call->pkt.u.request.stub_and_verifier.length,
		       call2->pkt.u.request.stub_and_verifier.data,
		       call2->pkt.u.request.stub_and_verifier.length);
		call->pkt.u.request.stub_and_verifier.length += 
			call2->pkt.u.request.stub_and_verifier.length;

		call->pkt.pfc_flags |= (call2->pkt.pfc_flags & DCERPC_PFC_FLAG_LAST);

		talloc_free(call2);
	}

	/* this may not be the last pdu in the chain - if its isn't then
	   just put it on the incoming_fragmented_call_list and wait for the rest */
	if (call->pkt.ptype == DCERPC_PKT_REQUEST &&
	    !(call->pkt.pfc_flags & DCERPC_PFC_FLAG_LAST)) {
		dcesrv_call_set_list(call, DCESRV_LIST_FRAGMENTED_CALL_LIST);
		return NT_STATUS_OK;
	} 
	
	/* This removes any fragments we may have had stashed away */
	dcesrv_call_set_list(call, DCESRV_LIST_NONE);

	switch (call->pkt.ptype) {
	case DCERPC_PKT_BIND:
		status = dcesrv_bind(call);
		break;
	case DCERPC_PKT_AUTH3:
		status = dcesrv_auth3(call);
		break;
	case DCERPC_PKT_ALTER:
		status = dcesrv_alter(call);
		break;
	case DCERPC_PKT_REQUEST:
		status = dcesrv_request(call);
		break;
	default:
		status = NT_STATUS_INVALID_PARAMETER;
		break;
	}

	/* if we are going to be sending a reply then add
	   it to the list of pending calls. We add it to the end to keep the call
	   list in the order we will answer */
	if (!NT_STATUS_IS_OK(status)) {
		talloc_free(call);
	}

	return status;
}

_PUBLIC_ NTSTATUS dcesrv_init_context(TALLOC_CTX *mem_ctx, 
				      struct loadparm_context *lp_ctx,
				      const char **endpoint_servers, struct dcesrv_context **_dce_ctx)
{
	NTSTATUS status;
	struct dcesrv_context *dce_ctx;
	int i;

	if (!endpoint_servers) {
		DEBUG(0,("dcesrv_init_context: no endpoint servers configured\n"));
		return NT_STATUS_INTERNAL_ERROR;
	}

	dce_ctx = talloc(mem_ctx, struct dcesrv_context);
	NT_STATUS_HAVE_NO_MEMORY(dce_ctx);
	dce_ctx->endpoint_list	= NULL;
	dce_ctx->lp_ctx = lp_ctx;
	dce_ctx->assoc_groups_idr = idr_init(dce_ctx);
	NT_STATUS_HAVE_NO_MEMORY(dce_ctx->assoc_groups_idr);

	for (i=0;endpoint_servers[i];i++) {
		const struct dcesrv_endpoint_server *ep_server;

		ep_server = dcesrv_ep_server_byname(endpoint_servers[i]);
		if (!ep_server) {
			DEBUG(0,("dcesrv_init_context: failed to find endpoint server = '%s'\n", endpoint_servers[i]));
			return NT_STATUS_INTERNAL_ERROR;
		}

		status = ep_server->init_server(dce_ctx, ep_server);
		if (!NT_STATUS_IS_OK(status)) {
			DEBUG(0,("dcesrv_init_context: failed to init endpoint server = '%s': %s\n", endpoint_servers[i],
				nt_errstr(status)));
			return status;
		}
	}

	*_dce_ctx = dce_ctx;
	return NT_STATUS_OK;
}

/* the list of currently registered DCERPC endpoint servers.
 */
static struct ep_server {
	struct dcesrv_endpoint_server *ep_server;
} *ep_servers = NULL;
static int num_ep_servers;

/*
  register a DCERPC endpoint server. 

  The 'name' can be later used by other backends to find the operations
  structure for this backend.  

  The 'type' is used to specify whether this is for a disk, printer or IPC$ share
*/
_PUBLIC_ NTSTATUS dcerpc_register_ep_server(const void *_ep_server)
{
	const struct dcesrv_endpoint_server *ep_server = _ep_server;
	
	if (dcesrv_ep_server_byname(ep_server->name) != NULL) {
		/* its already registered! */
		DEBUG(0,("DCERPC endpoint server '%s' already registered\n", 
			 ep_server->name));
		return NT_STATUS_OBJECT_NAME_COLLISION;
	}

	ep_servers = realloc_p(ep_servers, struct ep_server, num_ep_servers+1);
	if (!ep_servers) {
		smb_panic("out of memory in dcerpc_register");
	}

	ep_servers[num_ep_servers].ep_server = smb_xmemdup(ep_server, sizeof(*ep_server));
	ep_servers[num_ep_servers].ep_server->name = smb_xstrdup(ep_server->name);

	num_ep_servers++;

	DEBUG(3,("DCERPC endpoint server '%s' registered\n", 
		 ep_server->name));

	return NT_STATUS_OK;
}

/*
  return the operations structure for a named backend of the specified type
*/
const struct dcesrv_endpoint_server *dcesrv_ep_server_byname(const char *name)
{
	int i;

	for (i=0;i<num_ep_servers;i++) {
		if (strcmp(ep_servers[i].ep_server->name, name) == 0) {
			return ep_servers[i].ep_server;
		}
	}

	return NULL;
}

void dcerpc_server_init(struct loadparm_context *lp_ctx)
{
	static bool initialized;
	extern NTSTATUS dcerpc_server_wkssvc_init(void);
	extern NTSTATUS dcerpc_server_drsuapi_init(void);
	extern NTSTATUS dcerpc_server_winreg_init(void);
	extern NTSTATUS dcerpc_server_spoolss_init(void);
	extern NTSTATUS dcerpc_server_epmapper_init(void);
	extern NTSTATUS dcerpc_server_srvsvc_init(void);
	extern NTSTATUS dcerpc_server_netlogon_init(void);
	extern NTSTATUS dcerpc_server_rpcecho_init(void);
	extern NTSTATUS dcerpc_server_unixinfo_init(void);
	extern NTSTATUS dcerpc_server_samr_init(void);
	extern NTSTATUS dcerpc_server_remote_init(void);
	extern NTSTATUS dcerpc_server_lsa_init(void);
	extern NTSTATUS dcerpc_server_browser_init(void);
	extern NTSTATUS dcerpc_server_eventlog6_init(void);
	init_module_fn static_init[] = { STATIC_dcerpc_server_MODULES };
	init_module_fn *shared_init;

	if (initialized) {
		return;
	}
	initialized = true;

	shared_init = load_samba_modules(NULL, lp_ctx, "dcerpc_server");

	run_init_functions(static_init);
	run_init_functions(shared_init);

	talloc_free(shared_init);
}

/*
  return the DCERPC module version, and the size of some critical types
  This can be used by endpoint server modules to either detect compilation errors, or provide
  multiple implementations for different smbd compilation options in one module
*/
const struct dcesrv_critical_sizes *dcerpc_module_version(void)
{
	static const struct dcesrv_critical_sizes critical_sizes = {
		DCERPC_MODULE_VERSION,
		sizeof(struct dcesrv_context),
		sizeof(struct dcesrv_endpoint),
		sizeof(struct dcesrv_endpoint_server),
		sizeof(struct dcesrv_interface),
		sizeof(struct dcesrv_if_list),
		sizeof(struct dcesrv_connection),
		sizeof(struct dcesrv_call_state),
		sizeof(struct dcesrv_auth),
		sizeof(struct dcesrv_handle)
	};

	return &critical_sizes;
}

static void dcesrv_terminate_connection(struct dcesrv_connection *dce_conn, const char *reason)
{
	struct stream_connection *srv_conn;
	srv_conn = talloc_get_type(dce_conn->transport.private_data,
				   struct stream_connection);

	stream_terminate_connection(srv_conn, reason);
}
/* We need this include to be able to compile on some plateforms
 * (ie. freebsd 7.2) as it seems that <sys/uio.h> is not included
 * correctly.
 * It has to be that deep because otherwise we have a conflict on
 * const struct dcesrv_interface declaration.
 * This is mostly due to socket_wrapper defining #define bind swrap_bind
 * which conflict with the bind used before.
 */
#include "system/network.h"

struct dcesrv_sock_reply_state {
	struct dcesrv_connection *dce_conn;
	struct dcesrv_call_state *call;
	struct iovec iov;
};

static void dcesrv_sock_reply_done(struct tevent_req *subreq);

static void dcesrv_sock_report_output_data(struct dcesrv_connection *dce_conn)
{
	struct dcesrv_call_state *call;

	call = dce_conn->call_list;
	if (!call || !call->replies) {
		return;
	}

	while (call->replies) {
		struct data_blob_list_item *rep = call->replies;
		struct dcesrv_sock_reply_state *substate;
		struct tevent_req *subreq;

		substate = talloc(call, struct dcesrv_sock_reply_state);
		if (!substate) {
			dcesrv_terminate_connection(dce_conn, "no memory");
			return;
		}

		substate->dce_conn = dce_conn;
		substate->call = NULL;

		DLIST_REMOVE(call->replies, rep);

		if (call->replies == NULL) {
			substate->call = call;
		}

		substate->iov.iov_base = (void *) rep->blob.data;
		substate->iov.iov_len = rep->blob.length;

		subreq = tstream_writev_queue_send(substate,
						   dce_conn->event_ctx,
						   dce_conn->stream,
						   dce_conn->send_queue,
						   &substate->iov, 1);
		if (!subreq) {
			dcesrv_terminate_connection(dce_conn, "no memory");
			return;
		}
		tevent_req_set_callback(subreq, dcesrv_sock_reply_done,
					substate);
	}

	DLIST_REMOVE(call->conn->call_list, call);
	call->list = DCESRV_LIST_NONE;
}

static void dcesrv_sock_reply_done(struct tevent_req *subreq)
{
	struct dcesrv_sock_reply_state *substate = tevent_req_callback_data(subreq,
						struct dcesrv_sock_reply_state);
	int ret;
	int sys_errno;
	NTSTATUS status;
	struct dcesrv_call_state *call = substate->call;

	ret = tstream_writev_queue_recv(subreq, &sys_errno);
	TALLOC_FREE(subreq);
	if (ret == -1) {
		status = map_nt_error_from_unix(sys_errno);
		dcesrv_terminate_connection(substate->dce_conn, nt_errstr(status));
		return;
	}

	talloc_free(substate);
	if (call) {
		talloc_free(call);
	}
}




struct dcesrv_socket_context {
	const struct dcesrv_endpoint *endpoint;
	struct dcesrv_context *dcesrv_ctx;
};


static void dcesrv_read_fragment_done(struct tevent_req *subreq);

static void dcesrv_sock_accept(struct stream_connection *srv_conn)
{
	NTSTATUS status;
	struct dcesrv_socket_context *dcesrv_sock = 
		talloc_get_type(srv_conn->private_data, struct dcesrv_socket_context);
	struct dcesrv_connection *dcesrv_conn = NULL;
	int ret;
	struct tevent_req *subreq;
	struct loadparm_context *lp_ctx = dcesrv_sock->dcesrv_ctx->lp_ctx;

	if (!srv_conn->session_info) {
		status = auth_anonymous_session_info(srv_conn,
						     lp_ctx,
						     &srv_conn->session_info);
		if (!NT_STATUS_IS_OK(status)) {
			DEBUG(0,("dcesrv_sock_accept: auth_anonymous_session_info failed: %s\n",
				nt_errstr(status)));
			stream_terminate_connection(srv_conn, nt_errstr(status));
			return;
		}
	}

	status = dcesrv_endpoint_connect(dcesrv_sock->dcesrv_ctx,
					 srv_conn,
					 dcesrv_sock->endpoint,
					 srv_conn->session_info,
					 srv_conn->event.ctx,
					 srv_conn->msg_ctx,
					 srv_conn->server_id,
					 DCESRV_CALL_STATE_FLAG_MAY_ASYNC,
					 &dcesrv_conn);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0,("dcesrv_sock_accept: dcesrv_endpoint_connect failed: %s\n", 
			nt_errstr(status)));
		stream_terminate_connection(srv_conn, nt_errstr(status));
		return;
	}

	dcesrv_conn->transport.private_data		= srv_conn;
	dcesrv_conn->transport.report_output_data	= dcesrv_sock_report_output_data;

	TALLOC_FREE(srv_conn->event.fde);

	dcesrv_conn->send_queue = tevent_queue_create(dcesrv_conn, "dcesrv send queue");
	if (!dcesrv_conn->send_queue) {
		status = NT_STATUS_NO_MEMORY;
		DEBUG(0,("dcesrv_sock_accept: tevent_queue_create(%s)\n",
			nt_errstr(status)));
		stream_terminate_connection(srv_conn, nt_errstr(status));
		return;
	}

	if (dcesrv_sock->endpoint->ep_description->transport == NCACN_NP) {
		dcesrv_conn->auth_state.session_key = dcesrv_inherited_session_key;
		dcesrv_conn->stream = talloc_move(dcesrv_conn,
						  &srv_conn->tstream);
	} else {
		ret = tstream_bsd_existing_socket(dcesrv_conn,
						  socket_get_fd(srv_conn->socket),
						  &dcesrv_conn->stream);
		if (ret == -1) {
			status = map_nt_error_from_unix(errno);
			DEBUG(0, ("dcesrv_sock_accept: "
				  "failed to setup tstream: %s\n",
				  nt_errstr(status)));
			stream_terminate_connection(srv_conn, nt_errstr(status));
			return;
		}
		socket_set_flags(srv_conn->socket, SOCKET_FLAG_NOCLOSE);
	}

	dcesrv_conn->local_address = srv_conn->local_address;
	dcesrv_conn->remote_address = srv_conn->remote_address;

	srv_conn->private_data = dcesrv_conn;

	irpc_add_name(srv_conn->msg_ctx, "rpc_server");

	subreq = dcerpc_read_ncacn_packet_send(dcesrv_conn,
					       dcesrv_conn->event_ctx,
					       dcesrv_conn->stream);
	if (!subreq) {
		status = NT_STATUS_NO_MEMORY;
		DEBUG(0,("dcesrv_sock_accept: dcerpc_read_fragment_buffer_send(%s)\n",
			nt_errstr(status)));
		stream_terminate_connection(srv_conn, nt_errstr(status));
		return;
	}
	tevent_req_set_callback(subreq, dcesrv_read_fragment_done, dcesrv_conn);

	return;
}

static void dcesrv_read_fragment_done(struct tevent_req *subreq)
{
	struct dcesrv_connection *dce_conn = tevent_req_callback_data(subreq,
					     struct dcesrv_connection);
	struct ncacn_packet *pkt;
	DATA_BLOB buffer;
	NTSTATUS status;

	status = dcerpc_read_ncacn_packet_recv(subreq, dce_conn,
					       &pkt, &buffer);
	TALLOC_FREE(subreq);
	if (!NT_STATUS_IS_OK(status)) {
		dcesrv_terminate_connection(dce_conn, nt_errstr(status));
		return;
	}

	status = dcesrv_process_ncacn_packet(dce_conn, pkt, buffer);
	if (!NT_STATUS_IS_OK(status)) {
		dcesrv_terminate_connection(dce_conn, nt_errstr(status));
		return;
	}

	subreq = dcerpc_read_ncacn_packet_send(dce_conn,
					       dce_conn->event_ctx,
					       dce_conn->stream);
	if (!subreq) {
		status = NT_STATUS_NO_MEMORY;
		dcesrv_terminate_connection(dce_conn, nt_errstr(status));
		return;
	}
	tevent_req_set_callback(subreq, dcesrv_read_fragment_done, dce_conn);
}

static void dcesrv_sock_recv(struct stream_connection *conn, uint16_t flags)
{
	struct dcesrv_connection *dce_conn = talloc_get_type(conn->private_data,
					     struct dcesrv_connection);
	dcesrv_terminate_connection(dce_conn, "dcesrv_sock_recv triggered");
}

static void dcesrv_sock_send(struct stream_connection *conn, uint16_t flags)
{
	struct dcesrv_connection *dce_conn = talloc_get_type(conn->private_data,
					     struct dcesrv_connection);
	dcesrv_terminate_connection(dce_conn, "dcesrv_sock_send triggered");
}


static const struct stream_server_ops dcesrv_stream_ops = {
	.name			= "rpc",
	.accept_connection	= dcesrv_sock_accept,
	.recv_handler		= dcesrv_sock_recv,
	.send_handler		= dcesrv_sock_send,
};

static NTSTATUS dcesrv_add_ep_unix(struct dcesrv_context *dce_ctx, 
				   struct loadparm_context *lp_ctx,
				   struct dcesrv_endpoint *e,
			    struct tevent_context *event_ctx, const struct model_ops *model_ops)
{
	struct dcesrv_socket_context *dcesrv_sock;
	uint16_t port = 1;
	NTSTATUS status;

	dcesrv_sock = talloc(event_ctx, struct dcesrv_socket_context);
	NT_STATUS_HAVE_NO_MEMORY(dcesrv_sock);

	/* remember the endpoint of this socket */
	dcesrv_sock->endpoint		= e;
	dcesrv_sock->dcesrv_ctx		= talloc_reference(dcesrv_sock, dce_ctx);

	status = stream_setup_socket(event_ctx, lp_ctx,
				     model_ops, &dcesrv_stream_ops, 
				     "unix", e->ep_description->endpoint, &port, 
				     lpcfg_socket_options(lp_ctx),
				     dcesrv_sock);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0,("service_setup_stream_socket(path=%s) failed - %s\n",
			 e->ep_description->endpoint, nt_errstr(status)));
	}

	return status;
}

static NTSTATUS dcesrv_add_ep_ncalrpc(struct dcesrv_context *dce_ctx, 
				      struct loadparm_context *lp_ctx,
				      struct dcesrv_endpoint *e,
				      struct tevent_context *event_ctx, const struct model_ops *model_ops)
{
	struct dcesrv_socket_context *dcesrv_sock;
	uint16_t port = 1;
	char *full_path;
	NTSTATUS status;

	if (!e->ep_description->endpoint) {
		/* No identifier specified: use DEFAULT. 
		 * DO NOT hardcode this value anywhere else. Rather, specify 
		 * no endpoint and let the epmapper worry about it. */
		e->ep_description->endpoint = talloc_strdup(dce_ctx, "DEFAULT");
	}

	full_path = talloc_asprintf(dce_ctx, "%s/%s", lpcfg_ncalrpc_dir(lp_ctx),
				    e->ep_description->endpoint);

	dcesrv_sock = talloc(event_ctx, struct dcesrv_socket_context);
	NT_STATUS_HAVE_NO_MEMORY(dcesrv_sock);

	/* remember the endpoint of this socket */
	dcesrv_sock->endpoint		= e;
	dcesrv_sock->dcesrv_ctx		= talloc_reference(dcesrv_sock, dce_ctx);

	status = stream_setup_socket(event_ctx, lp_ctx,
				     model_ops, &dcesrv_stream_ops, 
				     "unix", full_path, &port, 
				     lpcfg_socket_options(lp_ctx),
				     dcesrv_sock);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0,("service_setup_stream_socket(identifier=%s,path=%s) failed - %s\n",
			 e->ep_description->endpoint, full_path, nt_errstr(status)));
	}
	return status;
}

static NTSTATUS dcesrv_add_ep_np(struct dcesrv_context *dce_ctx,
				 struct loadparm_context *lp_ctx,
				 struct dcesrv_endpoint *e,
				 struct tevent_context *event_ctx, const struct model_ops *model_ops)
{
	struct dcesrv_socket_context *dcesrv_sock;
	NTSTATUS status;
			
	if (e->ep_description->endpoint == NULL) {
		DEBUG(0, ("Endpoint mandatory for named pipes\n"));
		return NT_STATUS_INVALID_PARAMETER;
	}

	dcesrv_sock = talloc(event_ctx, struct dcesrv_socket_context);
	NT_STATUS_HAVE_NO_MEMORY(dcesrv_sock);

	/* remember the endpoint of this socket */
	dcesrv_sock->endpoint		= e;
	dcesrv_sock->dcesrv_ctx		= talloc_reference(dcesrv_sock, dce_ctx);

	status = tstream_setup_named_pipe(event_ctx, lp_ctx,
					  model_ops, &dcesrv_stream_ops,
					  e->ep_description->endpoint,
					  dcesrv_sock);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0,("stream_setup_named_pipe(pipe=%s) failed - %s\n",
			 e->ep_description->endpoint, nt_errstr(status)));
		return status;
	}

	return NT_STATUS_OK;
}

/*
  add a socket address to the list of events, one event per dcerpc endpoint
*/
static NTSTATUS add_socket_rpc_tcp_iface(struct dcesrv_context *dce_ctx, struct dcesrv_endpoint *e,
					 struct tevent_context *event_ctx, const struct model_ops *model_ops,
					 const char *address)
{
	struct dcesrv_socket_context *dcesrv_sock;
	uint16_t port = 0;
	NTSTATUS status;
			
	if (e->ep_description->endpoint) {
		port = atoi(e->ep_description->endpoint);
	}

	dcesrv_sock = talloc(event_ctx, struct dcesrv_socket_context);
	NT_STATUS_HAVE_NO_MEMORY(dcesrv_sock);

	/* remember the endpoint of this socket */
	dcesrv_sock->endpoint		= e;
	dcesrv_sock->dcesrv_ctx		= talloc_reference(dcesrv_sock, dce_ctx);

	status = stream_setup_socket(event_ctx, dce_ctx->lp_ctx,
				     model_ops, &dcesrv_stream_ops, 
				     "ipv4", address, &port, 
				     lpcfg_socket_options(dce_ctx->lp_ctx),
				     dcesrv_sock);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0,("service_setup_stream_socket(address=%s,port=%u) failed - %s\n", 
			 address, port, nt_errstr(status)));
	}

	if (e->ep_description->endpoint == NULL) {
		e->ep_description->endpoint = talloc_asprintf(dce_ctx, "%d", port);
	}

	return status;
}

#include "lib/socket/netif.h" /* Included here to work around the fact that socket_wrapper redefines bind() */

static NTSTATUS dcesrv_add_ep_tcp(struct dcesrv_context *dce_ctx, 
				  struct loadparm_context *lp_ctx,
				  struct dcesrv_endpoint *e,
				  struct tevent_context *event_ctx, const struct model_ops *model_ops)
{
	NTSTATUS status;

	/* Add TCP/IP sockets */
	if (lpcfg_interfaces(lp_ctx) && lpcfg_bind_interfaces_only(lp_ctx)) {
		int num_interfaces;
		int i;
		struct interface *ifaces;

		load_interfaces(dce_ctx, lpcfg_interfaces(lp_ctx), &ifaces);

		num_interfaces = iface_count(ifaces);
		for(i = 0; i < num_interfaces; i++) {
			const char *address = iface_n_ip(ifaces, i);
			status = add_socket_rpc_tcp_iface(dce_ctx, e, event_ctx, model_ops, address);
			NT_STATUS_NOT_OK_RETURN(status);
		}
	} else {
		status = add_socket_rpc_tcp_iface(dce_ctx, e, event_ctx, model_ops, 
						  lpcfg_socket_address(lp_ctx));
		NT_STATUS_NOT_OK_RETURN(status);
	}

	return NT_STATUS_OK;
}

NTSTATUS dcesrv_add_ep(struct dcesrv_context *dce_ctx,
		       struct loadparm_context *lp_ctx,
		       struct dcesrv_endpoint *e,
		       struct tevent_context *event_ctx,
		       const struct model_ops *model_ops)
{
	switch (e->ep_description->transport) {
	case NCACN_UNIX_STREAM:
		return dcesrv_add_ep_unix(dce_ctx, lp_ctx, e, event_ctx, model_ops);

	case NCALRPC:
		return dcesrv_add_ep_ncalrpc(dce_ctx, lp_ctx, e, event_ctx, model_ops);

	case NCACN_IP_TCP:
		return dcesrv_add_ep_tcp(dce_ctx, lp_ctx, e, event_ctx, model_ops);

	case NCACN_NP:
		return dcesrv_add_ep_np(dce_ctx, lp_ctx, e, event_ctx, model_ops);

	default:
		return NT_STATUS_NOT_SUPPORTED;
	}
}