summaryrefslogtreecommitdiff
path: root/source3/rpc_client/cli_pipe.c
blob: ba59a41793b971c3d6bcac69ef61f216970b3691 (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
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
/* 
 *  Unix SMB/CIFS implementation.
 *  RPC Pipe client / server routines
 *  Largely rewritten by Jeremy Allison		    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"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_RPC_CLI

extern struct pipe_id_info pipe_names[];

/********************************************************************
 Map internal value to wire value.
 ********************************************************************/

static int map_pipe_auth_type_to_rpc_auth_type(enum pipe_auth_type auth_type)
{
	switch (auth_type) {

	case PIPE_AUTH_TYPE_NONE:
		return RPC_ANONYMOUS_AUTH_TYPE;

	case PIPE_AUTH_TYPE_NTLMSSP:
		return RPC_NTLMSSP_AUTH_TYPE;

	case PIPE_AUTH_TYPE_SPNEGO_NTLMSSP:
	case PIPE_AUTH_TYPE_SPNEGO_KRB5:
		return RPC_SPNEGO_AUTH_TYPE;

	case PIPE_AUTH_TYPE_SCHANNEL:
		return RPC_SCHANNEL_AUTH_TYPE;

	case PIPE_AUTH_TYPE_KRB5:
		return RPC_KRB5_AUTH_TYPE;

	default:
		DEBUG(0,("map_pipe_auth_type_to_rpc_type: unknown pipe "
			"auth type %u\n",
			(unsigned int)auth_type ));
		break;
	}
	return -1;
}

/********************************************************************
 Rpc pipe call id.
 ********************************************************************/

static uint32 get_rpc_call_id(void)
{
	static uint32 call_id = 0;
	return ++call_id;
}

/*******************************************************************
 Use SMBreadX to get rest of one fragment's worth of rpc data.
 Will expand the current_pdu struct to the correct size.
 ********************************************************************/

static NTSTATUS rpc_read(struct rpc_pipe_client *cli,
			prs_struct *current_pdu,
			uint32 data_to_read,
			uint32 *current_pdu_offset)
{
	size_t size = (size_t)cli->max_recv_frag;
	uint32 stream_offset = 0;
	ssize_t num_read;
	char *pdata;
	ssize_t extra_data_size = ((ssize_t)*current_pdu_offset) + ((ssize_t)data_to_read) - (ssize_t)prs_data_size(current_pdu);

	DEBUG(5,("rpc_read: data_to_read: %u current_pdu offset: %u extra_data_size: %d\n",
		(unsigned int)data_to_read, (unsigned int)*current_pdu_offset, (int)extra_data_size ));

	/*
	 * Grow the buffer if needed to accommodate the data to be read.
	 */

	if (extra_data_size > 0) {
		if(!prs_force_grow(current_pdu, (uint32)extra_data_size)) {
			DEBUG(0,("rpc_read: Failed to grow parse struct by %d bytes.\n", (int)extra_data_size ));
			return NT_STATUS_NO_MEMORY;
		}
		DEBUG(5,("rpc_read: grew buffer by %d bytes to %u\n", (int)extra_data_size, prs_data_size(current_pdu) ));
	}

	pdata = prs_data_p(current_pdu) + *current_pdu_offset;

	do {
		/* read data using SMBreadX */
		if (size > (size_t)data_to_read) {
			size = (size_t)data_to_read;
		}

		num_read = cli_read(cli->cli, cli->fnum, pdata,
					 (off_t)stream_offset, size);

		DEBUG(5,("rpc_read: num_read = %d, read offset: %u, to read: %u\n",
			(int)num_read, (unsigned int)stream_offset, (unsigned int)data_to_read));

        	/*
	         * A dos error of ERRDOS/ERRmoredata is not an error.
		 */
		if (cli_is_dos_error(cli->cli)) {
			uint32 ecode;
			uint8 eclass;
			cli_dos_error(cli->cli, &eclass, &ecode);
			if (eclass != ERRDOS && ecode != ERRmoredata) {
				DEBUG(0,("rpc_read: DOS Error %d/%u (%s) in cli_read on pipe %s\n",
					eclass, (unsigned int)ecode,
					cli_errstr(cli->cli),
					cli->pipe_name ));
				return dos_to_ntstatus(eclass, ecode);
			}
		}

        	/*
	         * Likewise for NT_STATUS_BUFFER_TOO_SMALL
		 */
		if (cli_is_nt_error(cli->cli)) {
			if (!NT_STATUS_EQUAL(cli_nt_error(cli->cli), NT_STATUS_BUFFER_TOO_SMALL)) {
				DEBUG(0,("rpc_read: Error (%s) in cli_read on pipe %s\n",
					nt_errstr(cli_nt_error(cli->cli)),
					cli->pipe_name ));
				return cli_nt_error(cli->cli);
			}
		}

		if (num_read == -1) {
			DEBUG(0,("rpc_read: Error - cli_read on pipe %s returned -1\n",
				cli->pipe_name ));
			return cli_get_nt_error(cli->cli);
		}

		data_to_read -= num_read;
		stream_offset += num_read;
		pdata += num_read;

	} while (num_read > 0 && data_to_read > 0);
	/* && err == (0x80000000 | STATUS_BUFFER_OVERFLOW)); */

	/*
	 * Update the current offset into current_pdu by the amount read.
	 */
	*current_pdu_offset += stream_offset;
	return NT_STATUS_OK;
}

/****************************************************************************
 Try and get a PDU's worth of data from current_pdu. If not, then read more
 from the wire.
 ****************************************************************************/

static NTSTATUS cli_pipe_get_current_pdu(struct rpc_pipe_client *cli, RPC_HDR *prhdr, prs_struct *current_pdu)
{
	NTSTATUS ret = NT_STATUS_OK;
	uint32 current_pdu_len = prs_data_size(current_pdu);

	/* Ensure we have at least RPC_HEADER_LEN worth of data to parse. */
	if (current_pdu_len < RPC_HEADER_LEN) {
		/* rpc_read expands the current_pdu struct as neccessary. */
		ret = rpc_read(cli, current_pdu, RPC_HEADER_LEN - current_pdu_len, &current_pdu_len);
		if (!NT_STATUS_IS_OK(ret)) {
			return ret;
		}
	}

	/* This next call sets the endian bit correctly in current_pdu. */
	/* We will propagate this to rbuf later. */
	if(!smb_io_rpc_hdr("rpc_hdr   ", prhdr, current_pdu, 0)) {
		DEBUG(0,("cli_pipe_get_current_pdu: Failed to unmarshall RPC_HDR.\n"));
		return NT_STATUS_BUFFER_TOO_SMALL;
	}

	/* Ensure we have frag_len bytes of data. */
	if (current_pdu_len < prhdr->frag_len) {
		/* rpc_read expands the current_pdu struct as neccessary. */
		ret = rpc_read(cli, current_pdu, (uint32)prhdr->frag_len - current_pdu_len, &current_pdu_len);
		if (!NT_STATUS_IS_OK(ret)) {
			return ret;
		}
	}

	if (current_pdu_len < prhdr->frag_len) {
		return NT_STATUS_BUFFER_TOO_SMALL;
	}

	return NT_STATUS_OK;
}

/****************************************************************************
 NTLMSSP specific sign/seal.
 Virtually identical to rpc_server/srv_pipe.c:api_pipe_ntlmssp_auth_process.
 In fact I should probably abstract these into identical pieces of code... JRA.
 ****************************************************************************/

static NTSTATUS cli_pipe_verify_ntlmssp(struct rpc_pipe_client *cli, RPC_HDR *prhdr,
				prs_struct *current_pdu,
				uint8 *p_ss_padding_len)
{
	RPC_HDR_AUTH auth_info;
	uint32 save_offset = prs_offset(current_pdu);
	uint32 auth_len = prhdr->auth_len;
	NTLMSSP_STATE *ntlmssp_state = cli->auth.a_u.ntlmssp_state;
	unsigned char *data = NULL;
	size_t data_len;
	unsigned char *full_packet_data = NULL;
	size_t full_packet_data_len;
	DATA_BLOB auth_blob;
	NTSTATUS status;

	if (cli->auth.auth_level == PIPE_AUTH_LEVEL_NONE || cli->auth.auth_level == PIPE_AUTH_LEVEL_CONNECT) {
		return NT_STATUS_OK;
	}

	if (!ntlmssp_state) {
		return NT_STATUS_INVALID_PARAMETER;
	}

	/* Ensure there's enough data for an authenticated response. */
	if ((auth_len > RPC_MAX_SIGN_SIZE) ||
			(RPC_HEADER_LEN + RPC_HDR_RESP_LEN + RPC_HDR_AUTH_LEN + auth_len > prhdr->frag_len)) {
		DEBUG(0,("cli_pipe_verify_ntlmssp: auth_len %u is too large.\n",
			(unsigned int)auth_len ));
		return NT_STATUS_BUFFER_TOO_SMALL;
	}

	/*
	 * We need the full packet data + length (minus auth stuff) as well as the packet data + length
	 * after the RPC header.
	 * We need to pass in the full packet (minus auth len) to the NTLMSSP sign and check seal
	 * functions as NTLMv2 checks the rpc headers also.
	 */

	data = (unsigned char *)(prs_data_p(current_pdu) + RPC_HEADER_LEN + RPC_HDR_RESP_LEN);
	data_len = (size_t)(prhdr->frag_len - RPC_HEADER_LEN - RPC_HDR_RESP_LEN - RPC_HDR_AUTH_LEN - auth_len);

	full_packet_data = (unsigned char *)prs_data_p(current_pdu);
	full_packet_data_len = prhdr->frag_len - auth_len;

	/* Pull the auth header and the following data into a blob. */
	if(!prs_set_offset(current_pdu, RPC_HEADER_LEN + RPC_HDR_RESP_LEN + data_len)) {
		DEBUG(0,("cli_pipe_verify_ntlmssp: cannot move offset to %u.\n",
			(unsigned int)RPC_HEADER_LEN + (unsigned int)RPC_HDR_RESP_LEN + (unsigned int)data_len ));
		return NT_STATUS_BUFFER_TOO_SMALL;
	}

	if(!smb_io_rpc_hdr_auth("hdr_auth", &auth_info, current_pdu, 0)) {
		DEBUG(0,("cli_pipe_verify_ntlmssp: failed to unmarshall RPC_HDR_AUTH.\n"));
		return NT_STATUS_BUFFER_TOO_SMALL;
	}

	auth_blob.data = (unsigned char *)prs_data_p(current_pdu) + prs_offset(current_pdu);
	auth_blob.length = auth_len;

	switch (cli->auth.auth_level) {
		case PIPE_AUTH_LEVEL_PRIVACY:
			/* Data is encrypted. */
			status = ntlmssp_unseal_packet(ntlmssp_state,
							data, data_len,
							full_packet_data,
							full_packet_data_len,
							&auth_blob);
			if (!NT_STATUS_IS_OK(status)) {
				DEBUG(0,("cli_pipe_verify_ntlmssp: failed to unseal "
					"packet from remote machine %s on pipe %s "
					"fnum 0x%x. Error was %s.\n",
					cli->cli->desthost,
					cli->pipe_name,
					(unsigned int)cli->fnum,
					nt_errstr(status) ));
				return status;
			}
			break;
		case PIPE_AUTH_LEVEL_INTEGRITY:
			/* Data is signed. */
			status = ntlmssp_check_packet(ntlmssp_state,
							data, data_len,
							full_packet_data,
							full_packet_data_len,
							&auth_blob);
			if (!NT_STATUS_IS_OK(status)) {
				DEBUG(0,("cli_pipe_verify_ntlmssp: check signing failed on "
					"packet from remote machine %s on pipe %s "
					"fnum 0x%x. Error was %s.\n",
					cli->cli->desthost,
					cli->pipe_name,
					(unsigned int)cli->fnum,
					nt_errstr(status) ));
				return status;
			}
			break;
		default:
			DEBUG(0,("cli_pipe_verify_ntlmssp: unknown internal auth level %d\n",
				cli->auth.auth_level ));
			return NT_STATUS_INVALID_INFO_CLASS;
	}

	/*
	 * Return the current pointer to the data offset.
	 */

	if(!prs_set_offset(current_pdu, save_offset)) {
		DEBUG(0,("api_pipe_auth_process: failed to set offset back to %u\n",
			(unsigned int)save_offset ));
		return NT_STATUS_BUFFER_TOO_SMALL;
	}

	/*
	 * Remember the padding length. We must remove it from the real data
	 * stream once the sign/seal is done.
	 */

	*p_ss_padding_len = auth_info.auth_pad_len;

	return NT_STATUS_OK;
}

/****************************************************************************
 schannel specific sign/seal.
 ****************************************************************************/

static NTSTATUS cli_pipe_verify_schannel(struct rpc_pipe_client *cli, RPC_HDR *prhdr,
				prs_struct *current_pdu,
				uint8 *p_ss_padding_len)
{
	RPC_HDR_AUTH auth_info;
	RPC_AUTH_SCHANNEL_CHK schannel_chk;
	uint32 auth_len = prhdr->auth_len;
	uint32 save_offset = prs_offset(current_pdu);
	struct schannel_auth_struct *schannel_auth = cli->auth.a_u.schannel_auth;
	uint32 data_len;

	if (cli->auth.auth_level == PIPE_AUTH_LEVEL_NONE || cli->auth.auth_level == PIPE_AUTH_LEVEL_CONNECT) {
		return NT_STATUS_OK;
	}

	if (auth_len != RPC_AUTH_SCHANNEL_SIGN_OR_SEAL_CHK_LEN) {
		DEBUG(0,("cli_pipe_verify_schannel: auth_len %u.\n", (unsigned int)auth_len ));
		return NT_STATUS_INVALID_PARAMETER;
	}

	if (!schannel_auth) {
		return NT_STATUS_INVALID_PARAMETER;
	}

	/* Ensure there's enough data for an authenticated response. */
	if ((auth_len > RPC_MAX_SIGN_SIZE) ||
			(RPC_HEADER_LEN + RPC_HDR_RESP_LEN + RPC_HDR_AUTH_LEN + auth_len > prhdr->frag_len)) {
		DEBUG(0,("cli_pipe_verify_schannel: auth_len %u is too large.\n",
			(unsigned int)auth_len ));
		return NT_STATUS_INVALID_PARAMETER;
	}

	data_len = prhdr->frag_len - RPC_HEADER_LEN - RPC_HDR_RESP_LEN - RPC_HDR_AUTH_LEN - auth_len;

	if(!prs_set_offset(current_pdu, RPC_HEADER_LEN + RPC_HDR_RESP_LEN + data_len)) {
		DEBUG(0,("cli_pipe_verify_schannel: cannot move offset to %u.\n",
			(unsigned int)RPC_HEADER_LEN + RPC_HDR_RESP_LEN + data_len ));
		return NT_STATUS_BUFFER_TOO_SMALL;
	}
                                                                                                                             
	if(!smb_io_rpc_hdr_auth("hdr_auth", &auth_info, current_pdu, 0)) {
		DEBUG(0,("cli_pipe_verify_schannel: failed to unmarshall RPC_HDR_AUTH.\n"));
		return NT_STATUS_BUFFER_TOO_SMALL;
	}

	if (auth_info.auth_type != RPC_SCHANNEL_AUTH_TYPE) {
		DEBUG(0,("cli_pipe_verify_schannel: Invalid auth info %d on schannel\n",
			auth_info.auth_type));
		return NT_STATUS_BUFFER_TOO_SMALL;
	}

	if(!smb_io_rpc_auth_schannel_chk("", RPC_AUTH_SCHANNEL_SIGN_OR_SEAL_CHK_LEN,
				&schannel_chk, current_pdu, 0)) {
		DEBUG(0,("cli_pipe_verify_schannel: failed to unmarshal RPC_AUTH_SCHANNEL_CHK.\n"));
		return NT_STATUS_BUFFER_TOO_SMALL;
	}

	if (!schannel_decode(schannel_auth,
			cli->auth.auth_level,
			SENDER_IS_ACCEPTOR,
			&schannel_chk,
			prs_data_p(current_pdu)+RPC_HEADER_LEN+RPC_HDR_RESP_LEN,
			data_len)) {
		DEBUG(3,("cli_pipe_verify_schannel: failed to decode PDU "
				"Connection to remote machine %s "
				"pipe %s fnum 0x%x.\n",
				cli->cli->desthost,
				cli->pipe_name,
				(unsigned int)cli->fnum ));
		return NT_STATUS_INVALID_PARAMETER;
	}

	/* The sequence number gets incremented on both send and receive. */
	schannel_auth->seq_num++;

	/*
	 * Return the current pointer to the data offset.
	 */

	if(!prs_set_offset(current_pdu, save_offset)) {
		DEBUG(0,("api_pipe_auth_process: failed to set offset back to %u\n",
			(unsigned int)save_offset ));
		return NT_STATUS_BUFFER_TOO_SMALL;
	}

	/*
	 * Remember the padding length. We must remove it from the real data
	 * stream once the sign/seal is done.
	 */

	*p_ss_padding_len = auth_info.auth_pad_len;

	return NT_STATUS_OK;
}

/****************************************************************************
 Do the authentication checks on an incoming pdu. Check sign and unseal etc.
 ****************************************************************************/

static NTSTATUS cli_pipe_validate_rpc_response(struct rpc_pipe_client *cli, RPC_HDR *prhdr,
				prs_struct *current_pdu,
				uint8 *p_ss_padding_len)
{
	NTSTATUS ret = NT_STATUS_OK;

	/* Paranioa checks for auth_len. */
	if (prhdr->auth_len) {
		if (prhdr->auth_len > prhdr->frag_len) {
			return NT_STATUS_INVALID_PARAMETER;
		}

		if (prhdr->auth_len + RPC_HDR_AUTH_LEN < prhdr->auth_len ||
				prhdr->auth_len + RPC_HDR_AUTH_LEN < RPC_HDR_AUTH_LEN) {
			/* Integer wrap attempt. */
			return NT_STATUS_INVALID_PARAMETER;
		}
	}

	/*
	 * Now we have a complete RPC request PDU fragment, try and verify any auth data.
	 */

	switch(cli->auth.auth_type) {
		case PIPE_AUTH_TYPE_NONE:
			if (prhdr->auth_len) {
				DEBUG(3, ("cli_pipe_validate_rpc_response: Connection to remote machine %s "
					"pipe %s fnum 0x%x - got non-zero auth len %u.\n",
					cli->cli->desthost,
					cli->pipe_name,
					(unsigned int)cli->fnum,
					(unsigned int)prhdr->auth_len ));
				return NT_STATUS_INVALID_PARAMETER;
			}
			break;

		case PIPE_AUTH_TYPE_NTLMSSP:
		case PIPE_AUTH_TYPE_SPNEGO_NTLMSSP:
			ret = cli_pipe_verify_ntlmssp(cli, prhdr, current_pdu, p_ss_padding_len);
			if (!NT_STATUS_IS_OK(ret)) {
				return ret;
			}
			break;

		case PIPE_AUTH_TYPE_SCHANNEL:
			ret = cli_pipe_verify_schannel(cli, prhdr, current_pdu, p_ss_padding_len);
			if (!NT_STATUS_IS_OK(ret)) {
				return ret;
			}
			break;

		case PIPE_AUTH_TYPE_KRB5:
		case PIPE_AUTH_TYPE_SPNEGO_KRB5:
		default:
			DEBUG(3, ("cli_pipe_validate_rpc_response: Connection to remote machine %s "
				"pipe %s fnum %x - unknown internal auth type %u.\n",
				cli->cli->desthost,
				cli->pipe_name,
				(unsigned int)cli->fnum,
				cli->auth.auth_type ));
			return NT_STATUS_INVALID_INFO_CLASS;
	}

	return NT_STATUS_OK;
}

/****************************************************************************
 Do basic authentication checks on an incoming pdu.
 ****************************************************************************/

static NTSTATUS cli_pipe_validate_current_pdu(struct rpc_pipe_client *cli, RPC_HDR *prhdr,
			prs_struct *current_pdu,
			uint8 expected_pkt_type,
			char **ppdata,
			uint32 *pdata_len,
			prs_struct *return_data)
{

	NTSTATUS ret = NT_STATUS_OK;
	uint32 current_pdu_len = prs_data_size(current_pdu);

	if (current_pdu_len != prhdr->frag_len) {
		DEBUG(5,("cli_pipe_validate_current_pdu: incorrect pdu length %u, expected %u\n",
			(unsigned int)current_pdu_len, (unsigned int)prhdr->frag_len ));
		return NT_STATUS_INVALID_PARAMETER;
	}

	/*
	 * Point the return values at the real data including the RPC
	 * header. Just in case the caller wants it.
	 */
	*ppdata = prs_data_p(current_pdu);
	*pdata_len = current_pdu_len;

	/* Ensure we have the correct type. */
	switch (prhdr->pkt_type) {
		case RPC_ALTCONTRESP:
		case RPC_BINDACK:

			/* Alter context and bind ack share the same packet definitions. */
			break;


		case RPC_RESPONSE:
		{
			RPC_HDR_RESP rhdr_resp;
			uint8 ss_padding_len = 0;

			if(!smb_io_rpc_hdr_resp("rpc_hdr_resp", &rhdr_resp, current_pdu, 0)) {
				DEBUG(5,("cli_pipe_validate_current_pdu: failed to unmarshal RPC_HDR_RESP.\n"));
				return NT_STATUS_BUFFER_TOO_SMALL;
			}

			/* Here's where we deal with incoming sign/seal. */
			ret = cli_pipe_validate_rpc_response(cli, prhdr,
					current_pdu, &ss_padding_len);
			if (!NT_STATUS_IS_OK(ret)) {
				return ret;
			}

			/* Point the return values at the NDR data. Remember to remove any ss padding. */
			*ppdata = prs_data_p(current_pdu) + RPC_HEADER_LEN + RPC_HDR_RESP_LEN;

			if (current_pdu_len < RPC_HEADER_LEN + RPC_HDR_RESP_LEN + ss_padding_len) {
				return NT_STATUS_BUFFER_TOO_SMALL;
			}

			*pdata_len = current_pdu_len - RPC_HEADER_LEN - RPC_HDR_RESP_LEN - ss_padding_len;

			/* Remember to remove the auth footer. */
			if (prhdr->auth_len) {
				/* We've already done integer wrap tests on auth_len in
					cli_pipe_validate_rpc_response(). */
				if (*pdata_len < RPC_HDR_AUTH_LEN + prhdr->auth_len) {
					return NT_STATUS_BUFFER_TOO_SMALL;
				}
				*pdata_len -= (RPC_HDR_AUTH_LEN + prhdr->auth_len);
			}

			DEBUG(10,("cli_pipe_validate_current_pdu: got pdu len %u, data_len %u, ss_len %u\n",
				current_pdu_len, *pdata_len, ss_padding_len ));

			/*
			 * If this is the first reply, and the allocation hint is reasonably, try and
			 * set up the return_data parse_struct to the correct size.
			 */

			if ((prs_data_size(return_data) == 0) && rhdr_resp.alloc_hint && (rhdr_resp.alloc_hint < 15*1024*1024)) {
				if (!prs_set_buffer_size(return_data, rhdr_resp.alloc_hint)) {
					DEBUG(0,("cli_pipe_validate_current_pdu: reply alloc hint %u "
						"too large to allocate\n",
						(unsigned int)rhdr_resp.alloc_hint ));
					return NT_STATUS_NO_MEMORY;
				}
			}

			break;
		}

		case RPC_BINDNACK:
			DEBUG(1, ("cli_pipe_validate_current_pdu: Bind NACK received from remote machine %s "
				"pipe %s fnum 0x%x!\n",
				cli->cli->desthost,
				cli->pipe_name,
				(unsigned int)cli->fnum));
			/* Use this for now... */
			return NT_STATUS_NETWORK_ACCESS_DENIED;

		case RPC_FAULT:
		{
			RPC_HDR_RESP rhdr_resp;
			RPC_HDR_FAULT fault_resp;

			if(!smb_io_rpc_hdr_resp("rpc_hdr_resp", &rhdr_resp, current_pdu, 0)) {
				DEBUG(5,("cli_pipe_validate_current_pdu: failed to unmarshal RPC_HDR_RESP.\n"));
				return NT_STATUS_BUFFER_TOO_SMALL;
			}

			if(!smb_io_rpc_hdr_fault("fault", &fault_resp, current_pdu, 0)) {
				DEBUG(5,("cli_pipe_validate_current_pdu: failed to unmarshal RPC_HDR_FAULT.\n"));
				return NT_STATUS_BUFFER_TOO_SMALL;
			}

			DEBUG(1, ("cli_pipe_validate_current_pdu: RPC fault code %s received from remote machine %s "
				"pipe %s fnum 0x%x!\n",
				dcerpc_errstr(NT_STATUS_V(fault_resp.status)),
				cli->cli->desthost,
				cli->pipe_name,
				(unsigned int)cli->fnum));
			if (NT_STATUS_IS_OK(fault_resp.status)) {
				return NT_STATUS_UNSUCCESSFUL;
			} else {
				return fault_resp.status;
			}
			
		}

		default:
			DEBUG(0, ("cli_pipe_validate_current_pdu: unknown packet type %u received "
				"from remote machine %s pipe %s fnum 0x%x!\n",
				(unsigned int)prhdr->pkt_type,
				cli->cli->desthost,
				cli->pipe_name,
				(unsigned int)cli->fnum));
			return NT_STATUS_INVALID_INFO_CLASS;
	}

	if (prhdr->pkt_type != expected_pkt_type) {
		DEBUG(3, ("cli_pipe_validate_current_pdu: Connection to remote machine %s "
			"pipe %s fnum %x got an unexpected RPC packet "
			"type - %u, not %u\n",
			cli->cli->desthost,
			cli->pipe_name,
			(unsigned int)cli->fnum,
			prhdr->pkt_type,
			expected_pkt_type));
		return NT_STATUS_INVALID_INFO_CLASS;
	}

	/* Do this just before return - we don't want to modify any rpc header
	   data before now as we may have needed to do cryptographic actions on
	   it before. */

	if ((prhdr->pkt_type == RPC_BINDACK) && !(prhdr->flags & RPC_FLG_LAST)) {
		DEBUG(5,("cli_pipe_validate_current_pdu: bug in server (AS/U?), "
			"setting fragment first/last ON.\n"));
		prhdr->flags |= RPC_FLG_FIRST|RPC_FLG_LAST;
	}

	return NT_STATUS_OK;
}

/****************************************************************************
 Ensure we eat the just processed pdu from the current_pdu prs_struct.
 Normally the frag_len and buffer size will match, but on the first trans
 reply there is a theoretical chance that buffer size > frag_len, so we must
 deal with that.
 ****************************************************************************/

static NTSTATUS cli_pipe_reset_current_pdu(struct rpc_pipe_client *cli, RPC_HDR *prhdr, prs_struct *current_pdu)
{
	uint32 current_pdu_len = prs_data_size(current_pdu);

	if (current_pdu_len < prhdr->frag_len) {
		return NT_STATUS_BUFFER_TOO_SMALL;
	}

	/* Common case. */
	if (current_pdu_len == (uint32)prhdr->frag_len) {
		prs_mem_free(current_pdu);
		prs_init_empty(current_pdu, prs_get_mem_context(current_pdu), UNMARSHALL);
		/* Make current_pdu dynamic with no memory. */
		prs_give_memory(current_pdu, 0, 0, True);
		return NT_STATUS_OK;
	}

	/*
	 * Oh no ! More data in buffer than we processed in current pdu.
	 * Cheat. Move the data down and shrink the buffer.
	 */

	memcpy(prs_data_p(current_pdu), prs_data_p(current_pdu) + prhdr->frag_len,
			current_pdu_len - prhdr->frag_len);

	/* Remember to set the read offset back to zero. */
	prs_set_offset(current_pdu, 0);

	/* Shrink the buffer. */
	if (!prs_set_buffer_size(current_pdu, current_pdu_len - prhdr->frag_len)) {
		return NT_STATUS_BUFFER_TOO_SMALL;
	}

	return NT_STATUS_OK;
}

/****************************************************************************
 Send data on an rpc pipe via trans. The prs_struct data must be the last
 pdu fragment of an NDR data stream.

 Receive response data from an rpc pipe, which may be large...

 Read the first fragment: unfortunately have to use SMBtrans for the first
 bit, then SMBreadX for subsequent bits.

 If first fragment received also wasn't the last fragment, continue
 getting fragments until we _do_ receive the last fragment.

 Request/Response PDU's look like the following...

 |<------------------PDU len----------------------------------------------->|
 |<-HDR_LEN-->|<--REQ LEN------>|.............|<-AUTH_HDRLEN->|<-AUTH_LEN-->|

 +------------+-----------------+-------------+---------------+-------------+
 | RPC HEADER | REQ/RESP HEADER | DATA ...... | AUTH_HDR      | AUTH DATA   |
 +------------+-----------------+-------------+---------------+-------------+

 Where the presence of the AUTH_HDR and AUTH DATA are dependent on the
 signing & sealing being negotiated.

 ****************************************************************************/

static NTSTATUS rpc_api_pipe(struct rpc_pipe_client *cli,
			prs_struct *data, /* Outgoing pdu fragment, already formatted for send. */
			prs_struct *rbuf, /* Incoming reply - return as an NDR stream. */
			uint8 expected_pkt_type)
{
	NTSTATUS ret = NT_STATUS_UNSUCCESSFUL;
	char *rparam = NULL;
	uint32 rparam_len = 0;
	uint16 setup[2];
	char *pdata = prs_data_p(data);
	uint32 data_len = prs_offset(data);
	char *prdata = NULL;
	uint32 rdata_len = 0;
	uint32 max_data = cli->max_xmit_frag ? cli->max_xmit_frag : RPC_MAX_PDU_FRAG_LEN;
	uint32 current_rbuf_offset = 0;
	prs_struct current_pdu;
	
#ifdef DEVELOPER
	/* Ensure we're not sending too much. */
	SMB_ASSERT(data_len <= max_data);
#endif

	/* Set up the current pdu parse struct. */
	prs_init_empty(&current_pdu, prs_get_mem_context(rbuf), UNMARSHALL);

	/* Create setup parameters - must be in native byte order. */
	setup[0] = TRANSACT_DCERPCCMD; 
	setup[1] = cli->fnum; /* Pipe file handle. */

	DEBUG(5,("rpc_api_pipe: Remote machine %s pipe %s fnum 0x%x\n",
		cli->cli->desthost,
		cli->pipe_name,
		(unsigned int)cli->fnum ));

	/*
	 * Send the last (or only) fragment of an RPC request. For small
	 * amounts of data (about 1024 bytes or so) the RPC request and response
	 * appears in a SMBtrans request and response.
	 */

	if (!cli_api_pipe(cli->cli, "\\PIPE\\",
	          setup, 2, 0,                     /* Setup, length, max */
	          NULL, 0, 0,                      /* Params, length, max */
	          pdata, data_len, max_data,   	   /* data, length, max */
	          &rparam, &rparam_len,            /* return params, len */
	          &prdata, &rdata_len))            /* return data, len */
	{
		DEBUG(0, ("rpc_api_pipe: Remote machine %s pipe %s fnum 0x%x "
			"returned critical error. Error was %s\n",
			cli->cli->desthost,
			cli->pipe_name,
			(unsigned int)cli->fnum,
			cli_errstr(cli->cli)));
		ret = cli_get_nt_error(cli->cli);
		SAFE_FREE(rparam);
		SAFE_FREE(prdata);
		goto err;
	}

	/* Throw away returned params - we know we won't use them. */

	SAFE_FREE(rparam);

	if (prdata == NULL) {
		DEBUG(3,("rpc_api_pipe: Remote machine %s pipe %s "
			"fnum 0x%x failed to return data.\n",
			cli->cli->desthost,
			cli->pipe_name,
			(unsigned int)cli->fnum));
		/* Yes - some calls can truely return no data... */
		prs_mem_free(&current_pdu);
		return NT_STATUS_OK;
	}

	/*
	 * Give this memory as dynamic to the current pdu.
	 */

	prs_give_memory(&current_pdu, prdata, rdata_len, True);

	/* Ensure we can mess with the return prs_struct. */
	SMB_ASSERT(UNMARSHALLING(rbuf));
	SMB_ASSERT(prs_data_size(rbuf) == 0);

	/* Make rbuf dynamic with no memory. */
	prs_give_memory(rbuf, 0, 0, True);

	while(1) {
		RPC_HDR rhdr;
		char *ret_data;
		uint32 ret_data_len;

		/* Ensure we have enough data for a pdu. */
		ret = cli_pipe_get_current_pdu(cli, &rhdr, &current_pdu);
		if (!NT_STATUS_IS_OK(ret)) {
			goto err;
		}

		/* We pass in rbuf here so if the alloc hint is set correctly 
		   we can set the output size and avoid reallocs. */

		ret = cli_pipe_validate_current_pdu(cli, &rhdr, &current_pdu, expected_pkt_type,
				&ret_data, &ret_data_len, rbuf);

		DEBUG(10,("rpc_api_pipe: got PDU len of %u at offset %u\n",
			prs_data_size(&current_pdu), current_rbuf_offset ));

		if (!NT_STATUS_IS_OK(ret)) {
			goto err;
		}

		if ((rhdr.flags & RPC_FLG_FIRST)) {
			if (rhdr.pack_type[0] == 0) {
				/* Set the data type correctly for big-endian data on the first packet. */
				DEBUG(10,("rpc_api_pipe: On machine %s pipe %s fnum 0x%x "
					"PDU data format is big-endian.\n",
					cli->cli->desthost,
					cli->pipe_name,
					(unsigned int)cli->fnum));

				prs_set_endian_data(rbuf, RPC_BIG_ENDIAN);
			} else {
				/* Check endianness on subsequent packets. */
				if (current_pdu.bigendian_data != rbuf->bigendian_data) {
					DEBUG(0,("rpc_api_pipe: Error : Endianness changed from %s to %s\n",
						rbuf->bigendian_data ? "big" : "little",
						current_pdu.bigendian_data ? "big" : "little" ));
					ret = NT_STATUS_INVALID_PARAMETER;
					goto err;
				}
			}
		}

		/* Now copy the data portion out of the pdu into rbuf. */
		if (!prs_force_grow(rbuf, ret_data_len)) {
                        ret = NT_STATUS_NO_MEMORY;
                        goto err;
                }
		memcpy(prs_data_p(rbuf)+current_rbuf_offset, ret_data, (size_t)ret_data_len);
		current_rbuf_offset += ret_data_len;

		/* See if we've finished with all the data in current_pdu yet ? */
		ret = cli_pipe_reset_current_pdu(cli, &rhdr, &current_pdu);
		if (!NT_STATUS_IS_OK(ret)) {
			goto err;
		}

		if (rhdr.flags & RPC_FLG_LAST) {
			break; /* We're done. */
		}
	}

	DEBUG(10,("rpc_api_pipe: Remote machine %s pipe %s fnum 0x%x returned %u bytes.\n",
		cli->cli->desthost,
		cli->pipe_name,
		(unsigned int)cli->fnum,
		(unsigned int)prs_data_size(rbuf) ));

	prs_mem_free(&current_pdu);
	return NT_STATUS_OK;

  err:

	prs_mem_free(&current_pdu);
	prs_mem_free(rbuf);
	return ret;
}

/*******************************************************************
 Creates krb5 auth bind.
 ********************************************************************/

static NTSTATUS create_krb5_auth_bind_req( struct rpc_pipe_client *cli,
						enum pipe_auth_level auth_level,
						RPC_HDR_AUTH *pauth_out,
						prs_struct *auth_data)
{
#ifdef HAVE_KRB5
	int ret;
	struct kerberos_auth_struct *a = cli->auth.a_u.kerberos_auth;
	DATA_BLOB tkt = data_blob_null;
	DATA_BLOB tkt_wrapped = data_blob_null;

	/* We may change the pad length before marshalling. */
	init_rpc_hdr_auth(pauth_out, RPC_KRB5_AUTH_TYPE, (int)auth_level, 0, 1);

	DEBUG(5, ("create_krb5_auth_bind_req: creating a service ticket for principal %s\n",
		a->service_principal ));

	/* Create the ticket for the service principal and return it in a gss-api wrapped blob. */

	ret = cli_krb5_get_ticket(a->service_principal, 0, &tkt,
			&a->session_key, (uint32)AP_OPTS_MUTUAL_REQUIRED, NULL, NULL);

	if (ret) {
		DEBUG(1,("create_krb5_auth_bind_req: cli_krb5_get_ticket for principal %s "
			"failed with %s\n",
			a->service_principal,
			error_message(ret) ));

		data_blob_free(&tkt);
		prs_mem_free(auth_data);
		return NT_STATUS_INVALID_PARAMETER;
	}

	/* wrap that up in a nice GSS-API wrapping */
	tkt_wrapped = spnego_gen_krb5_wrap(tkt, TOK_ID_KRB_AP_REQ);

	data_blob_free(&tkt);

	/* Auth len in the rpc header doesn't include auth_header. */
	if (!prs_copy_data_in(auth_data, (char *)tkt_wrapped.data, tkt_wrapped.length)) {
		data_blob_free(&tkt_wrapped);
		prs_mem_free(auth_data);
		return NT_STATUS_NO_MEMORY;
	}

	DEBUG(5, ("create_krb5_auth_bind_req: Created krb5 GSS blob :\n"));
	dump_data(5, tkt_wrapped.data, tkt_wrapped.length);

	data_blob_free(&tkt_wrapped);
	return NT_STATUS_OK;
#else
	return NT_STATUS_INVALID_PARAMETER;
#endif
}

/*******************************************************************
 Creates SPNEGO NTLMSSP auth bind.
 ********************************************************************/

static NTSTATUS create_spnego_ntlmssp_auth_rpc_bind_req( struct rpc_pipe_client *cli,
						enum pipe_auth_level auth_level,
						RPC_HDR_AUTH *pauth_out,
						prs_struct *auth_data)
{
	NTSTATUS nt_status;
	DATA_BLOB null_blob = data_blob_null;
	DATA_BLOB request = data_blob_null;
	DATA_BLOB spnego_msg = data_blob_null;

	/* We may change the pad length before marshalling. */
	init_rpc_hdr_auth(pauth_out, RPC_SPNEGO_AUTH_TYPE, (int)auth_level, 0, 1);

	DEBUG(5, ("create_spnego_ntlmssp_auth_rpc_bind_req: Processing NTLMSSP Negotiate\n"));
	nt_status = ntlmssp_update(cli->auth.a_u.ntlmssp_state,
					null_blob,
					&request);

	if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
		data_blob_free(&request);
		prs_mem_free(auth_data);
		return nt_status;
	}

	/* Wrap this in SPNEGO. */
	spnego_msg = gen_negTokenInit(OID_NTLMSSP, request);

	data_blob_free(&request);

	/* Auth len in the rpc header doesn't include auth_header. */
	if (!prs_copy_data_in(auth_data, (char *)spnego_msg.data, spnego_msg.length)) {
		data_blob_free(&spnego_msg);
		prs_mem_free(auth_data);
		return NT_STATUS_NO_MEMORY;
	}

	DEBUG(5, ("create_spnego_ntlmssp_auth_rpc_bind_req: NTLMSSP Negotiate:\n"));
	dump_data(5, spnego_msg.data, spnego_msg.length);

	data_blob_free(&spnego_msg);
	return NT_STATUS_OK;
}

/*******************************************************************
 Creates NTLMSSP auth bind.
 ********************************************************************/

static NTSTATUS create_ntlmssp_auth_rpc_bind_req( struct rpc_pipe_client *cli,
						enum pipe_auth_level auth_level,
						RPC_HDR_AUTH *pauth_out,
						prs_struct *auth_data)
{
	NTSTATUS nt_status;
	DATA_BLOB null_blob = data_blob_null;
	DATA_BLOB request = data_blob_null;

	/* We may change the pad length before marshalling. */
	init_rpc_hdr_auth(pauth_out, RPC_NTLMSSP_AUTH_TYPE, (int)auth_level, 0, 1);

	DEBUG(5, ("create_ntlmssp_auth_rpc_bind_req: Processing NTLMSSP Negotiate\n"));
	nt_status = ntlmssp_update(cli->auth.a_u.ntlmssp_state,
					null_blob,
					&request);

	if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
		data_blob_free(&request);
		prs_mem_free(auth_data);
		return nt_status;
	}

	/* Auth len in the rpc header doesn't include auth_header. */
	if (!prs_copy_data_in(auth_data, (char *)request.data, request.length)) {
		data_blob_free(&request);
		prs_mem_free(auth_data);
		return NT_STATUS_NO_MEMORY;
	}

	DEBUG(5, ("create_ntlmssp_auth_rpc_bind_req: NTLMSSP Negotiate:\n"));
	dump_data(5, request.data, request.length);

	data_blob_free(&request);
	return NT_STATUS_OK;
}

/*******************************************************************
 Creates schannel auth bind.
 ********************************************************************/

static NTSTATUS create_schannel_auth_rpc_bind_req( struct rpc_pipe_client *cli,
						enum pipe_auth_level auth_level,
						RPC_HDR_AUTH *pauth_out,
						prs_struct *auth_data)
{
	RPC_AUTH_SCHANNEL_NEG schannel_neg;

	/* We may change the pad length before marshalling. */
	init_rpc_hdr_auth(pauth_out, RPC_SCHANNEL_AUTH_TYPE, (int)auth_level, 0, 1);

	/* Use lp_workgroup() if domain not specified */

	if (!cli->domain || !cli->domain[0]) {
		cli->domain = lp_workgroup();
	}

	init_rpc_auth_schannel_neg(&schannel_neg, cli->domain, global_myname());

	/*
	 * Now marshall the data into the auth parse_struct.
	 */

	if(!smb_io_rpc_auth_schannel_neg("schannel_neg",
				       &schannel_neg, auth_data, 0)) {
		DEBUG(0,("Failed to marshall RPC_AUTH_SCHANNEL_NEG.\n"));
		prs_mem_free(auth_data);
		return NT_STATUS_NO_MEMORY;
	}

	return NT_STATUS_OK;
}

/*******************************************************************
 Creates the internals of a DCE/RPC bind request or alter context PDU.
 ********************************************************************/

static NTSTATUS create_bind_or_alt_ctx_internal(enum RPC_PKT_TYPE pkt_type,
						prs_struct *rpc_out, 
						uint32 rpc_call_id,
						RPC_IFACE *abstract,
						RPC_IFACE *transfer,
						RPC_HDR_AUTH *phdr_auth,
						prs_struct *pauth_info)
{
	RPC_HDR hdr;
	RPC_HDR_RB hdr_rb;
	RPC_CONTEXT rpc_ctx;
	uint16 auth_len = prs_offset(pauth_info);
	uint8 ss_padding_len = 0;
	uint16 frag_len = 0;

	/* create the RPC context. */
	init_rpc_context(&rpc_ctx, 0 /* context id */, abstract, transfer);

	/* create the bind request RPC_HDR_RB */
	init_rpc_hdr_rb(&hdr_rb, RPC_MAX_PDU_FRAG_LEN, RPC_MAX_PDU_FRAG_LEN, 0x0, &rpc_ctx);

	/* Start building the frag length. */
	frag_len = RPC_HEADER_LEN + RPC_HDR_RB_LEN(&hdr_rb);

	/* Do we need to pad ? */
	if (auth_len) {
		uint16 data_len = RPC_HEADER_LEN + RPC_HDR_RB_LEN(&hdr_rb);
		if (data_len % 8) {
			ss_padding_len = 8 - (data_len % 8);
			phdr_auth->auth_pad_len = ss_padding_len;
		}
		frag_len += RPC_HDR_AUTH_LEN + auth_len + ss_padding_len;
	}

	/* Create the request RPC_HDR */
	init_rpc_hdr(&hdr, pkt_type, RPC_FLG_FIRST|RPC_FLG_LAST, rpc_call_id, frag_len, auth_len);

	/* Marshall the RPC header */
	if(!smb_io_rpc_hdr("hdr"   , &hdr, rpc_out, 0)) {
		DEBUG(0,("create_bind_or_alt_ctx_internal: failed to marshall RPC_HDR.\n"));
		return NT_STATUS_NO_MEMORY;
	}

	/* Marshall the bind request data */
	if(!smb_io_rpc_hdr_rb("", &hdr_rb, rpc_out, 0)) {
		DEBUG(0,("create_bind_or_alt_ctx_internal: failed to marshall RPC_HDR_RB.\n"));
		return NT_STATUS_NO_MEMORY;
	}

	/*
	 * Grow the outgoing buffer to store any auth info.
	 */

	if(auth_len != 0) {
		if (ss_padding_len) {
			char pad[8];
			memset(pad, '\0', 8);
			if (!prs_copy_data_in(rpc_out, pad, ss_padding_len)) {
				DEBUG(0,("create_bind_or_alt_ctx_internal: failed to marshall padding.\n"));
				return NT_STATUS_NO_MEMORY;
			}
		}

		if(!smb_io_rpc_hdr_auth("hdr_auth", phdr_auth, rpc_out, 0)) {
			DEBUG(0,("create_bind_or_alt_ctx_internal: failed to marshall RPC_HDR_AUTH.\n"));
			return NT_STATUS_NO_MEMORY;
		}


		if(!prs_append_prs_data( rpc_out, pauth_info)) {
			DEBUG(0,("create_bind_or_alt_ctx_internal: failed to grow parse struct to add auth.\n"));
			return NT_STATUS_NO_MEMORY;
		}
	}

	return NT_STATUS_OK;
}

/*******************************************************************
 Creates a DCE/RPC bind request.
 ********************************************************************/

static NTSTATUS create_rpc_bind_req(struct rpc_pipe_client *cli,
				prs_struct *rpc_out, 
				uint32 rpc_call_id,
				RPC_IFACE *abstract, RPC_IFACE *transfer,
				enum pipe_auth_type auth_type,
				enum pipe_auth_level auth_level)
{
	RPC_HDR_AUTH hdr_auth;
	prs_struct auth_info;
	NTSTATUS ret = NT_STATUS_OK;

	ZERO_STRUCT(hdr_auth);
	if (!prs_init(&auth_info, RPC_HDR_AUTH_LEN, prs_get_mem_context(rpc_out), MARSHALL))
		return NT_STATUS_NO_MEMORY;

	switch (auth_type) {
		case PIPE_AUTH_TYPE_SCHANNEL:
			ret = create_schannel_auth_rpc_bind_req(cli, auth_level, &hdr_auth, &auth_info);
			if (!NT_STATUS_IS_OK(ret)) {
				prs_mem_free(&auth_info);
				return ret;
			}
			break;

		case PIPE_AUTH_TYPE_NTLMSSP:
			ret = create_ntlmssp_auth_rpc_bind_req(cli, auth_level, &hdr_auth, &auth_info);
			if (!NT_STATUS_IS_OK(ret)) {
				prs_mem_free(&auth_info);
				return ret;
			}
			break;

		case PIPE_AUTH_TYPE_SPNEGO_NTLMSSP:
			ret = create_spnego_ntlmssp_auth_rpc_bind_req(cli, auth_level, &hdr_auth, &auth_info);
			if (!NT_STATUS_IS_OK(ret)) {
				prs_mem_free(&auth_info);
				return ret;
			}
			break;

		case PIPE_AUTH_TYPE_KRB5:
			ret = create_krb5_auth_bind_req(cli, auth_level, &hdr_auth, &auth_info);
			if (!NT_STATUS_IS_OK(ret)) {
				prs_mem_free(&auth_info);
				return ret;
			}
			break;

		case PIPE_AUTH_TYPE_NONE:
			break;

		default:
			/* "Can't" happen. */
			return NT_STATUS_INVALID_INFO_CLASS;
	}

	ret = create_bind_or_alt_ctx_internal(RPC_BIND,
						rpc_out, 
						rpc_call_id,
						abstract,
						transfer,
						&hdr_auth,
						&auth_info);

	prs_mem_free(&auth_info);
	return ret;
}

/*******************************************************************
 Create and add the NTLMSSP sign/seal auth header and data.
 ********************************************************************/

static NTSTATUS add_ntlmssp_auth_footer(struct rpc_pipe_client *cli,
					RPC_HDR *phdr,
					uint32 ss_padding_len,
					prs_struct *outgoing_pdu)
{
	RPC_HDR_AUTH auth_info;
	NTSTATUS status;
	DATA_BLOB auth_blob = data_blob_null;
	uint16 data_and_pad_len = prs_offset(outgoing_pdu) - RPC_HEADER_LEN - RPC_HDR_RESP_LEN;

	if (!cli->auth.a_u.ntlmssp_state) {
		return NT_STATUS_INVALID_PARAMETER;
	}

	/* Init and marshall the auth header. */
	init_rpc_hdr_auth(&auth_info,
			map_pipe_auth_type_to_rpc_auth_type(cli->auth.auth_type),
			cli->auth.auth_level,
			ss_padding_len,
			1 /* context id. */);

	if(!smb_io_rpc_hdr_auth("hdr_auth", &auth_info, outgoing_pdu, 0)) {
		DEBUG(0,("add_ntlmssp_auth_footer: failed to marshall RPC_HDR_AUTH.\n"));
		data_blob_free(&auth_blob);
		return NT_STATUS_NO_MEMORY;
	}

	switch (cli->auth.auth_level) {
		case PIPE_AUTH_LEVEL_PRIVACY:
			/* Data portion is encrypted. */
			status = ntlmssp_seal_packet(cli->auth.a_u.ntlmssp_state,
					(unsigned char *)prs_data_p(outgoing_pdu) + RPC_HEADER_LEN + RPC_HDR_RESP_LEN,
					data_and_pad_len,
					(unsigned char *)prs_data_p(outgoing_pdu),
					(size_t)prs_offset(outgoing_pdu),
					&auth_blob);
			if (!NT_STATUS_IS_OK(status)) {
				data_blob_free(&auth_blob);
				return status;
			}
			break;

		case PIPE_AUTH_LEVEL_INTEGRITY:
			/* Data is signed. */
			status = ntlmssp_sign_packet(cli->auth.a_u.ntlmssp_state,
					(unsigned char *)prs_data_p(outgoing_pdu) + RPC_HEADER_LEN + RPC_HDR_RESP_LEN,
					data_and_pad_len,
					(unsigned char *)prs_data_p(outgoing_pdu),
					(size_t)prs_offset(outgoing_pdu),
					&auth_blob);
			if (!NT_STATUS_IS_OK(status)) {
				data_blob_free(&auth_blob);
				return status;
			}
			break;

		default:
			/* Can't happen. */
			smb_panic("bad auth level");
			/* Notreached. */
			return NT_STATUS_INVALID_PARAMETER;
	}

	/* Finally marshall the blob. */
	                                                                                               
	if (!prs_copy_data_in(outgoing_pdu, (const char *)auth_blob.data, NTLMSSP_SIG_SIZE)) {
		DEBUG(0,("add_ntlmssp_auth_footer: failed to add %u bytes auth blob.\n",
			(unsigned int)NTLMSSP_SIG_SIZE));
		data_blob_free(&auth_blob);
		return NT_STATUS_NO_MEMORY;
	}
                                                                                                                                
	data_blob_free(&auth_blob);
	return NT_STATUS_OK;
}

/*******************************************************************
 Create and add the schannel sign/seal auth header and data.
 ********************************************************************/

static NTSTATUS add_schannel_auth_footer(struct rpc_pipe_client *cli,
					RPC_HDR *phdr,
					uint32 ss_padding_len,
					prs_struct *outgoing_pdu)
{
	RPC_HDR_AUTH auth_info;
	RPC_AUTH_SCHANNEL_CHK verf;
	struct schannel_auth_struct *sas = cli->auth.a_u.schannel_auth;
	char *data_p = prs_data_p(outgoing_pdu) + RPC_HEADER_LEN + RPC_HDR_RESP_LEN;
	size_t data_and_pad_len = prs_offset(outgoing_pdu) - RPC_HEADER_LEN - RPC_HDR_RESP_LEN;

	if (!sas) {
		return NT_STATUS_INVALID_PARAMETER;
	}

	/* Init and marshall the auth header. */
	init_rpc_hdr_auth(&auth_info,
			map_pipe_auth_type_to_rpc_auth_type(cli->auth.auth_type),
			cli->auth.auth_level,
			ss_padding_len,
			1 /* context id. */);

	if(!smb_io_rpc_hdr_auth("hdr_auth", &auth_info, outgoing_pdu, 0)) {
		DEBUG(0,("add_schannel_auth_footer: failed to marshall RPC_HDR_AUTH.\n"));
		return NT_STATUS_NO_MEMORY;
	}

	switch (cli->auth.auth_level) {
		case PIPE_AUTH_LEVEL_PRIVACY:
		case PIPE_AUTH_LEVEL_INTEGRITY:
			DEBUG(10,("add_schannel_auth_footer: SCHANNEL seq_num=%d\n",
				sas->seq_num));

			schannel_encode(sas,
					cli->auth.auth_level,
					SENDER_IS_INITIATOR,
					&verf,
					data_p,
					data_and_pad_len);

			sas->seq_num++;
			break;

		default:
			/* Can't happen. */
			smb_panic("bad auth level");
			/* Notreached. */
			return NT_STATUS_INVALID_PARAMETER;
	}

	/* Finally marshall the blob. */
	smb_io_rpc_auth_schannel_chk("",
			RPC_AUTH_SCHANNEL_SIGN_OR_SEAL_CHK_LEN,
			&verf,
			outgoing_pdu,
			0);
                                                                                               
	return NT_STATUS_OK;
}

/*******************************************************************
 Calculate how much data we're going to send in this packet, also
 work out any sign/seal padding length.
 ********************************************************************/

static uint32 calculate_data_len_tosend(struct rpc_pipe_client *cli,
					uint32 data_left,
					uint16 *p_frag_len,
					uint16 *p_auth_len,
					uint32 *p_ss_padding)
{
	uint32 data_space, data_len;

	switch (cli->auth.auth_level) {
		case PIPE_AUTH_LEVEL_NONE:
		case PIPE_AUTH_LEVEL_CONNECT:
			data_space = cli->max_xmit_frag - RPC_HEADER_LEN - RPC_HDR_REQ_LEN;
			data_len = MIN(data_space, data_left);
			*p_ss_padding = 0;
			*p_auth_len = 0;
			*p_frag_len = RPC_HEADER_LEN + RPC_HDR_REQ_LEN + data_len;
			return data_len;

		case PIPE_AUTH_LEVEL_INTEGRITY:
		case PIPE_AUTH_LEVEL_PRIVACY:
			/* Treat the same for all authenticated rpc requests. */
			switch(cli->auth.auth_type) {
				case PIPE_AUTH_TYPE_SPNEGO_NTLMSSP:
				case PIPE_AUTH_TYPE_NTLMSSP:
					*p_auth_len = NTLMSSP_SIG_SIZE;
					break;
				case PIPE_AUTH_TYPE_SCHANNEL:
					*p_auth_len = RPC_AUTH_SCHANNEL_SIGN_OR_SEAL_CHK_LEN;
					break;
				default:
					smb_panic("bad auth type");
					break;
			}

			data_space = cli->max_xmit_frag - RPC_HEADER_LEN - RPC_HDR_REQ_LEN -
						RPC_HDR_AUTH_LEN - *p_auth_len;

			data_len = MIN(data_space, data_left);
			if (data_len % 8) {
				*p_ss_padding = 8 - (data_len % 8);
			}
			*p_frag_len = RPC_HEADER_LEN + RPC_HDR_REQ_LEN + 		/* Normal headers. */
					data_len + *p_ss_padding + 		/* data plus padding. */
					RPC_HDR_AUTH_LEN + *p_auth_len;		/* Auth header and auth data. */
			return data_len;

		default:
			smb_panic("bad auth level");
			/* Notreached. */
			return 0;
	}
}

/*******************************************************************
 External interface.
 Does an rpc request on a pipe. Incoming data is NDR encoded in in_data.
 Reply is NDR encoded in out_data. Splits the data stream into RPC PDU's
 and deals with signing/sealing details.
 ********************************************************************/

NTSTATUS rpc_api_pipe_req(struct rpc_pipe_client *cli,
			uint8 op_num,
			prs_struct *in_data,
			prs_struct *out_data)
{
	NTSTATUS ret;
	uint32 data_left = prs_offset(in_data);
	uint32 alloc_hint = prs_offset(in_data);
	uint32 data_sent_thistime = 0;
	uint32 current_data_offset = 0;
	uint32 call_id = get_rpc_call_id();
	char pad[8];
	prs_struct outgoing_pdu;

	memset(pad, '\0', 8);

	if (cli->max_xmit_frag < RPC_HEADER_LEN + RPC_HDR_REQ_LEN + RPC_MAX_SIGN_SIZE) {
		/* Server is screwed up ! */
		return NT_STATUS_INVALID_PARAMETER;
	}

	if (!prs_init(&outgoing_pdu, cli->max_xmit_frag, prs_get_mem_context(in_data), MARSHALL))
		return NT_STATUS_NO_MEMORY;

	while (1) {
		RPC_HDR hdr;
		RPC_HDR_REQ hdr_req;
		uint16 auth_len = 0;
		uint16 frag_len = 0;
		uint8 flags = 0;
		uint32 ss_padding = 0;

		data_sent_thistime = calculate_data_len_tosend(cli, data_left,
						&frag_len, &auth_len, &ss_padding);

		if (current_data_offset == 0) {
			flags = RPC_FLG_FIRST;
		}

		if (data_sent_thistime == data_left) {
			flags |= RPC_FLG_LAST;
		}

		/* Create and marshall the header and request header. */
		init_rpc_hdr(&hdr, RPC_REQUEST, flags, call_id, frag_len, auth_len);

		if(!smb_io_rpc_hdr("hdr    ", &hdr, &outgoing_pdu, 0)) {
			prs_mem_free(&outgoing_pdu);
			return NT_STATUS_NO_MEMORY;
		}

		/* Create the rpc request RPC_HDR_REQ */
		init_rpc_hdr_req(&hdr_req, alloc_hint, op_num);

		if(!smb_io_rpc_hdr_req("hdr_req", &hdr_req, &outgoing_pdu, 0)) {
			prs_mem_free(&outgoing_pdu);
			return NT_STATUS_NO_MEMORY;
		}

		/* Copy in the data, plus any ss padding. */
		if (!prs_append_some_prs_data(&outgoing_pdu, in_data, current_data_offset, data_sent_thistime)) {
			prs_mem_free(&outgoing_pdu);
			return NT_STATUS_NO_MEMORY;
		}

		/* Copy the sign/seal padding data. */
		if (ss_padding) {
			if (!prs_copy_data_in(&outgoing_pdu, pad, ss_padding)) {
				prs_mem_free(&outgoing_pdu);
				return NT_STATUS_NO_MEMORY;
			}
		}

		/* Generate any auth sign/seal and add the auth footer. */
		if (auth_len) {
			switch (cli->auth.auth_type) {
				case PIPE_AUTH_TYPE_NONE:
					break;
				case PIPE_AUTH_TYPE_NTLMSSP:
				case PIPE_AUTH_TYPE_SPNEGO_NTLMSSP:
					ret = add_ntlmssp_auth_footer(cli, &hdr, ss_padding, &outgoing_pdu);
					if (!NT_STATUS_IS_OK(ret)) {
						prs_mem_free(&outgoing_pdu);
						return ret;
					}
					break;
				case PIPE_AUTH_TYPE_SCHANNEL:
					ret = add_schannel_auth_footer(cli, &hdr, ss_padding, &outgoing_pdu);
					if (!NT_STATUS_IS_OK(ret)) {
						prs_mem_free(&outgoing_pdu);
						return ret;
					}
					break;
				default:
					smb_panic("bad auth type");
					break; /* notreached */
			}
		}

		/* Actually send the packet. */
		if (flags & RPC_FLG_LAST) {
			/* Last packet - send the data, get the reply and return. */
			ret = rpc_api_pipe(cli, &outgoing_pdu, out_data, RPC_RESPONSE);
			prs_mem_free(&outgoing_pdu);

			if (DEBUGLEVEL >= 50) {
				char *dump_name = NULL;
				/* Also capture received data */
				if (asprintf(&dump_name, "%s/reply_%s_%d",
						get_dyn_LOGFILEBASE(), cli->pipe_name,
						op_num) > 0) {
					prs_dump(dump_name, op_num, out_data);
					SAFE_FREE(dump_name);
				}
			}

			return ret;
		} else {
			/* More packets to come - write and continue. */
			ssize_t num_written = cli_write(cli->cli, cli->fnum, 8, /* 8 means message mode. */
							prs_data_p(&outgoing_pdu),
							(off_t)0,
							(size_t)hdr.frag_len);

			if (num_written != hdr.frag_len) {
				prs_mem_free(&outgoing_pdu);
				return cli_get_nt_error(cli->cli);
			}
		}

		current_data_offset += data_sent_thistime;
		data_left -= data_sent_thistime;

		/* Reset the marshalling position back to zero. */
		if (!prs_set_offset(&outgoing_pdu, 0)) {
			prs_mem_free(&outgoing_pdu);
			return NT_STATUS_NO_MEMORY;
		}
	}
}
#if 0
/****************************************************************************
 Set the handle state.
****************************************************************************/

static bool rpc_pipe_set_hnd_state(struct rpc_pipe_client *cli,
				   const char *pipe_name, uint16 device_state)
{
	bool state_set = False;
	char param[2];
	uint16 setup[2]; /* only need 2 uint16 setup parameters */
	char *rparam = NULL;
	char *rdata = NULL;
	uint32 rparam_len, rdata_len;

	if (pipe_name == NULL)
		return False;

	DEBUG(5,("Set Handle state Pipe[%x]: %s - device state:%x\n",
		 cli->fnum, pipe_name, device_state));

	/* create parameters: device state */
	SSVAL(param, 0, device_state);

	/* create setup parameters. */
	setup[0] = 0x0001; 
	setup[1] = cli->fnum; /* pipe file handle.  got this from an SMBOpenX. */

	/* send the data on \PIPE\ */
	if (cli_api_pipe(cli->cli, "\\PIPE\\",
	            setup, 2, 0,                /* setup, length, max */
	            param, 2, 0,                /* param, length, max */
	            NULL, 0, 1024,              /* data, length, max */
	            &rparam, &rparam_len,        /* return param, length */
	            &rdata, &rdata_len))         /* return data, length */
	{
		DEBUG(5, ("Set Handle state: return OK\n"));
		state_set = True;
	}

	SAFE_FREE(rparam);
	SAFE_FREE(rdata);

	return state_set;
}
#endif

/****************************************************************************
 Check the rpc bind acknowledge response.
****************************************************************************/

static bool valid_pipe_name(const int pipe_idx, RPC_IFACE *abstract, RPC_IFACE *transfer)
{
	if ( pipe_idx >= PI_MAX_PIPES ) {
		DEBUG(0,("valid_pipe_name: Programmer error!  Invalid pipe index [%d]\n",
			pipe_idx));
		return False;
	}

	DEBUG(5,("Bind Abstract Syntax: "));	
	dump_data(5, (uint8 *)&pipe_names[pipe_idx].abstr_syntax, 
	          sizeof(pipe_names[pipe_idx].abstr_syntax));
	DEBUG(5,("Bind Transfer Syntax: "));
	dump_data(5, (uint8 *)&pipe_names[pipe_idx].trans_syntax,
	          sizeof(pipe_names[pipe_idx].trans_syntax));

	/* copy the required syntaxes out so we can do the right bind */
	
	*transfer = pipe_names[pipe_idx].trans_syntax;
	*abstract = pipe_names[pipe_idx].abstr_syntax;

	return True;
}

/****************************************************************************
 Check the rpc bind acknowledge response.
****************************************************************************/

static bool check_bind_response(RPC_HDR_BA *hdr_ba, const int pipe_idx, RPC_IFACE *transfer)
{
	if ( hdr_ba->addr.len == 0) {
		DEBUG(4,("Ignoring length check -- ASU bug (server didn't fill in the pipe name correctly)"));
	}

# if 0	/* JERRY -- apparently ASU forgets to fill in the server pipe name sometimes */
	if ( !strequal(hdr_ba->addr.str, pipe_names[pipe_idx].client_pipe) &&
	     !strequal(hdr_ba->addr.str, pipe_names[pipe_idx].server_pipe) )
	{
		DEBUG(4,("bind_rpc_pipe: pipe_name %s != expected pipe %s.  oh well!\n",
		         pipe_names[i].server_pipe ,hdr_ba->addr.str));
		return False;
	}
	
	DEBUG(5,("bind_rpc_pipe: server pipe_name found: %s\n", pipe_names[i].server_pipe ));

	if (pipe_names[pipe_idx].server_pipe == NULL) {
		DEBUG(2,("bind_rpc_pipe: pipe name %s unsupported\n", hdr_ba->addr.str));
		return False;
	}
#endif 	/* JERRY */

	/* check the transfer syntax */
	if ((hdr_ba->transfer.if_version != transfer->if_version) ||
	     (memcmp(&hdr_ba->transfer.uuid, &transfer->uuid, sizeof(transfer->uuid)) !=0)) {
		DEBUG(2,("bind_rpc_pipe: transfer syntax differs\n"));
		return False;
	}

	if (hdr_ba->res.num_results != 0x1 || hdr_ba->res.result != 0) {
		DEBUG(2,("bind_rpc_pipe: bind denied results: %d reason: %x\n",
		          hdr_ba->res.num_results, hdr_ba->res.reason));
	}

	DEBUG(5,("check_bind_response: accepted!\n"));
	return True;
}

/*******************************************************************
 Creates a DCE/RPC bind authentication response.
 This is the packet that is sent back to the server once we
 have received a BIND-ACK, to finish the third leg of
 the authentication handshake.
 ********************************************************************/

static NTSTATUS create_rpc_bind_auth3(struct rpc_pipe_client *cli,
				uint32 rpc_call_id,
				enum pipe_auth_type auth_type,
				enum pipe_auth_level auth_level,
				DATA_BLOB *pauth_blob,
				prs_struct *rpc_out)
{
	RPC_HDR hdr;
	RPC_HDR_AUTH hdr_auth;
	uint32 pad = 0;

	/* Create the request RPC_HDR */
	init_rpc_hdr(&hdr, RPC_AUTH3, RPC_FLG_FIRST|RPC_FLG_LAST, rpc_call_id,
		     RPC_HEADER_LEN + 4 /* pad */ + RPC_HDR_AUTH_LEN + pauth_blob->length,
		     pauth_blob->length );
	
	/* Marshall it. */
	if(!smb_io_rpc_hdr("hdr", &hdr, rpc_out, 0)) {
		DEBUG(0,("create_rpc_bind_auth3: failed to marshall RPC_HDR.\n"));
		return NT_STATUS_NO_MEMORY;
	}

	/*
		I'm puzzled about this - seems to violate the DCE RPC auth rules,
		about padding - shouldn't this pad to length 8 ? JRA.
	*/

	/* 4 bytes padding. */
	if (!prs_uint32("pad", rpc_out, 0, &pad)) {
		DEBUG(0,("create_rpc_bind_auth3: failed to marshall 4 byte pad.\n"));
		return NT_STATUS_NO_MEMORY;
	}

	/* Create the request RPC_HDR_AUTHA */
	init_rpc_hdr_auth(&hdr_auth,
			map_pipe_auth_type_to_rpc_auth_type(auth_type),
			auth_level, 0, 1);

	if(!smb_io_rpc_hdr_auth("hdr_auth", &hdr_auth, rpc_out, 0)) {
		DEBUG(0,("create_rpc_bind_auth3: failed to marshall RPC_HDR_AUTHA.\n"));
		return NT_STATUS_NO_MEMORY;
	}

	/*
	 * Append the auth data to the outgoing buffer.
	 */

	if(!prs_copy_data_in(rpc_out, (char *)pauth_blob->data, pauth_blob->length)) {
		DEBUG(0,("create_rpc_bind_auth3: failed to marshall auth blob.\n"));
		return NT_STATUS_NO_MEMORY;
	}

	return NT_STATUS_OK;
}

/****************************************************************************
 Create and send the third packet in an RPC auth.
****************************************************************************/

static NTSTATUS rpc_finish_auth3_bind(struct rpc_pipe_client *cli,
				RPC_HDR *phdr,
				prs_struct *rbuf,
				uint32 rpc_call_id,
				enum pipe_auth_type auth_type,
				enum pipe_auth_level auth_level)
{
	DATA_BLOB server_response = data_blob_null;
	DATA_BLOB client_reply = data_blob_null;
	RPC_HDR_AUTH hdr_auth;
	NTSTATUS nt_status;
	prs_struct rpc_out;
	ssize_t ret;

	if (!phdr->auth_len || (phdr->frag_len < phdr->auth_len + RPC_HDR_AUTH_LEN)) {
		return NT_STATUS_INVALID_PARAMETER;
	}

	/* Process the returned NTLMSSP blob first. */
	if (!prs_set_offset(rbuf, phdr->frag_len - phdr->auth_len - RPC_HDR_AUTH_LEN)) {
		return NT_STATUS_INVALID_PARAMETER;
	}

	if(!smb_io_rpc_hdr_auth("hdr_auth", &hdr_auth, rbuf, 0)) {
		return NT_STATUS_INVALID_PARAMETER;
	}

	/* TODO - check auth_type/auth_level match. */

	server_response = data_blob(NULL, phdr->auth_len);
	prs_copy_data_out((char *)server_response.data, rbuf, phdr->auth_len);
	
	nt_status = ntlmssp_update(cli->auth.a_u.ntlmssp_state,
				   server_response,
				   &client_reply);
	
	if (!NT_STATUS_IS_OK(nt_status)) {
		DEBUG(0,("rpc_finish_auth3_bind: NTLMSSP update using server blob failed.\n"));
		data_blob_free(&server_response);
		return nt_status;
	}

	prs_init_empty(&rpc_out, prs_get_mem_context(rbuf), MARSHALL);

	nt_status = create_rpc_bind_auth3(cli, rpc_call_id,
				auth_type, auth_level,
				&client_reply, &rpc_out);

	if (!NT_STATUS_IS_OK(nt_status)) {
		prs_mem_free(&rpc_out);
		data_blob_free(&client_reply);
		data_blob_free(&server_response);
		return nt_status;
	}

	/* 8 here is named pipe message mode. */
	ret = cli_write(cli->cli, cli->fnum, 0x8, prs_data_p(&rpc_out), 0,
				(size_t)prs_offset(&rpc_out));

	if (ret != (ssize_t)prs_offset(&rpc_out)) {
		DEBUG(0,("rpc_send_auth_auth3: cli_write failed. Return was %d\n", (int)ret));
		prs_mem_free(&rpc_out);
		data_blob_free(&client_reply);
		data_blob_free(&server_response);
		return cli_get_nt_error(cli->cli);
	}

	DEBUG(5,("rpc_send_auth_auth3: Remote machine %s pipe %s "
		"fnum 0x%x sent auth3 response ok.\n",
		cli->cli->desthost,
		cli->pipe_name,
		(unsigned int)cli->fnum));

	prs_mem_free(&rpc_out);
	data_blob_free(&client_reply);
	data_blob_free(&server_response);
	return NT_STATUS_OK;
}

/*******************************************************************
 Creates a DCE/RPC bind alter context authentication request which
 may contain a spnego auth blobl
 ********************************************************************/

static NTSTATUS create_rpc_alter_context(uint32 rpc_call_id,
					RPC_IFACE *abstract,
					RPC_IFACE *transfer,
					enum pipe_auth_level auth_level,
					const DATA_BLOB *pauth_blob, /* spnego auth blob already created. */
					prs_struct *rpc_out)
{
	RPC_HDR_AUTH hdr_auth;
	prs_struct auth_info;
	NTSTATUS ret = NT_STATUS_OK;

	ZERO_STRUCT(hdr_auth);
	if (!prs_init(&auth_info, RPC_HDR_AUTH_LEN, prs_get_mem_context(rpc_out), MARSHALL))
		return NT_STATUS_NO_MEMORY;

	/* We may change the pad length before marshalling. */
	init_rpc_hdr_auth(&hdr_auth, RPC_SPNEGO_AUTH_TYPE, (int)auth_level, 0, 1);

	if (pauth_blob->length) {
		if (!prs_copy_data_in(&auth_info, (const char *)pauth_blob->data, pauth_blob->length)) {
			prs_mem_free(&auth_info);
			return NT_STATUS_NO_MEMORY;
		}
	}

	ret = create_bind_or_alt_ctx_internal(RPC_ALTCONT,
						rpc_out, 
						rpc_call_id,
						abstract,
						transfer,
						&hdr_auth,
						&auth_info);
	prs_mem_free(&auth_info);
	return ret;
}

/*******************************************************************
 Third leg of the SPNEGO bind mechanism - sends alter context PDU
 and gets a response.
 ********************************************************************/

static NTSTATUS rpc_finish_spnego_ntlmssp_bind(struct rpc_pipe_client *cli,
                                RPC_HDR *phdr,
                                prs_struct *rbuf,
                                uint32 rpc_call_id,
				RPC_IFACE *abstract,
				RPC_IFACE *transfer,
                                enum pipe_auth_type auth_type,
                                enum pipe_auth_level auth_level)
{
	DATA_BLOB server_spnego_response = data_blob_null;
	DATA_BLOB server_ntlm_response = data_blob_null;
	DATA_BLOB client_reply = data_blob_null;
	DATA_BLOB tmp_blob = data_blob_null;
	RPC_HDR_AUTH hdr_auth;
	NTSTATUS nt_status;
	prs_struct rpc_out;

	if (!phdr->auth_len || (phdr->frag_len < phdr->auth_len + RPC_HDR_AUTH_LEN)) {
		return NT_STATUS_INVALID_PARAMETER;
	}

	/* Process the returned NTLMSSP blob first. */
	if (!prs_set_offset(rbuf, phdr->frag_len - phdr->auth_len - RPC_HDR_AUTH_LEN)) {
		return NT_STATUS_INVALID_PARAMETER;
	}

	if(!smb_io_rpc_hdr_auth("hdr_auth", &hdr_auth, rbuf, 0)) {
		return NT_STATUS_INVALID_PARAMETER;
	}

	server_spnego_response = data_blob(NULL, phdr->auth_len);
	prs_copy_data_out((char *)server_spnego_response.data, rbuf, phdr->auth_len);
	
	/* The server might give us back two challenges - tmp_blob is for the second. */
	if (!spnego_parse_challenge(server_spnego_response, &server_ntlm_response, &tmp_blob)) {
		data_blob_free(&server_spnego_response);
		data_blob_free(&server_ntlm_response);
		data_blob_free(&tmp_blob);
		return NT_STATUS_INVALID_PARAMETER;
	}

	/* We're finished with the server spnego response and the tmp_blob. */
	data_blob_free(&server_spnego_response);
	data_blob_free(&tmp_blob);

	nt_status = ntlmssp_update(cli->auth.a_u.ntlmssp_state,
				   server_ntlm_response,
				   &client_reply);
	
	/* Finished with the server_ntlm response */
	data_blob_free(&server_ntlm_response);

	if (!NT_STATUS_IS_OK(nt_status)) {
		DEBUG(0,("rpc_finish_spnego_ntlmssp_bind: NTLMSSP update using server blob failed.\n"));
		data_blob_free(&client_reply);
		return nt_status;
	}

	/* SPNEGO wrap the client reply. */
	tmp_blob = spnego_gen_auth(client_reply);
	data_blob_free(&client_reply);
	client_reply = tmp_blob;
	tmp_blob = data_blob_null; /* Ensure it's safe to free this just in case. */

	/* Now prepare the alter context pdu. */
	prs_init_empty(&rpc_out, prs_get_mem_context(rbuf), MARSHALL);

	nt_status = create_rpc_alter_context(rpc_call_id,
						abstract,
						transfer,
						auth_level,
						&client_reply,
						&rpc_out);

	data_blob_free(&client_reply);

	if (!NT_STATUS_IS_OK(nt_status)) {
		prs_mem_free(&rpc_out);
		return nt_status;
	}

	/* Initialize the returning data struct. */
	prs_mem_free(rbuf);
	prs_init_empty(rbuf, cli->mem_ctx, UNMARSHALL);

	nt_status = rpc_api_pipe(cli, &rpc_out, rbuf, RPC_ALTCONTRESP);
	if (!NT_STATUS_IS_OK(nt_status)) {
		prs_mem_free(&rpc_out);
		return nt_status;
	}

	prs_mem_free(&rpc_out);

	/* Get the auth blob from the reply. */
	if(!smb_io_rpc_hdr("rpc_hdr   ", phdr, rbuf, 0)) {
		DEBUG(0,("rpc_finish_spnego_ntlmssp_bind: Failed to unmarshall RPC_HDR.\n"));
		return NT_STATUS_BUFFER_TOO_SMALL;
	}

	if (!prs_set_offset(rbuf, phdr->frag_len - phdr->auth_len - RPC_HDR_AUTH_LEN)) {
		return NT_STATUS_INVALID_PARAMETER;
	}

	if(!smb_io_rpc_hdr_auth("hdr_auth", &hdr_auth, rbuf, 0)) {
		return NT_STATUS_INVALID_PARAMETER;
	}

	server_spnego_response = data_blob(NULL, phdr->auth_len);
	prs_copy_data_out((char *)server_spnego_response.data, rbuf, phdr->auth_len);

	/* Check we got a valid auth response. */
	if (!spnego_parse_auth_response(server_spnego_response, NT_STATUS_OK, OID_NTLMSSP, &tmp_blob)) {
		data_blob_free(&server_spnego_response);
		data_blob_free(&tmp_blob);
		return NT_STATUS_INVALID_PARAMETER;
	}

	data_blob_free(&server_spnego_response);
	data_blob_free(&tmp_blob);

	DEBUG(5,("rpc_finish_spnego_ntlmssp_bind: alter context request to "
		"remote machine %s pipe %s fnum 0x%x.\n",
		cli->cli->desthost,
		cli->pipe_name,
		(unsigned int)cli->fnum));

	return NT_STATUS_OK;
}

/****************************************************************************
 Do an rpc bind.
****************************************************************************/

static NTSTATUS rpc_pipe_bind(struct rpc_pipe_client *cli,
			enum pipe_auth_type auth_type,
			enum pipe_auth_level auth_level)
{
	RPC_HDR hdr;
	RPC_HDR_BA hdr_ba;
	RPC_IFACE abstract;
	RPC_IFACE transfer;
	prs_struct rpc_out;
	prs_struct rbuf;
	uint32 rpc_call_id;
	NTSTATUS status;

	DEBUG(5,("Bind RPC Pipe[%x]: %s auth_type %u, auth_level %u\n",
		(unsigned int)cli->fnum,
		cli->pipe_name,
		(unsigned int)auth_type,
		(unsigned int)auth_level ));

	if (!valid_pipe_name(cli->pipe_idx, &abstract, &transfer)) {
		return NT_STATUS_INVALID_PARAMETER;
	}

	prs_init_empty(&rpc_out, cli->mem_ctx, MARSHALL);

	rpc_call_id = get_rpc_call_id();

	/* Marshall the outgoing data. */
	status = create_rpc_bind_req(cli, &rpc_out, rpc_call_id,
				&abstract, &transfer,
				auth_type,
				auth_level);

	if (!NT_STATUS_IS_OK(status)) {
		prs_mem_free(&rpc_out);
		return status;
	}

	/* Initialize the incoming data struct. */
	prs_init_empty(&rbuf, cli->mem_ctx, UNMARSHALL);

	/* send data on \PIPE\.  receive a response */
	status = rpc_api_pipe(cli, &rpc_out, &rbuf, RPC_BINDACK);
	if (!NT_STATUS_IS_OK(status)) {
		prs_mem_free(&rpc_out);
		return status;
	}

	prs_mem_free(&rpc_out);

	DEBUG(3,("rpc_pipe_bind: Remote machine %s pipe %s "
		"fnum 0x%x bind request returned ok.\n",
		cli->cli->desthost,
		cli->pipe_name,
		(unsigned int)cli->fnum));

	/* Unmarshall the RPC header */
	if(!smb_io_rpc_hdr("hdr"   , &hdr, &rbuf, 0)) {
		DEBUG(0,("rpc_pipe_bind: failed to unmarshall RPC_HDR.\n"));
		prs_mem_free(&rbuf);
		return NT_STATUS_BUFFER_TOO_SMALL;
	}

	if(!smb_io_rpc_hdr_ba("", &hdr_ba, &rbuf, 0)) {
		DEBUG(0,("rpc_pipe_bind: Failed to unmarshall RPC_HDR_BA.\n"));
		prs_mem_free(&rbuf);
		return NT_STATUS_BUFFER_TOO_SMALL;
	}

	if(!check_bind_response(&hdr_ba, cli->pipe_idx, &transfer)) {
		DEBUG(2,("rpc_pipe_bind: check_bind_response failed.\n"));
		prs_mem_free(&rbuf);
		return NT_STATUS_BUFFER_TOO_SMALL;
	}

	cli->max_xmit_frag = hdr_ba.bba.max_tsize;
	cli->max_recv_frag = hdr_ba.bba.max_rsize;

	/* For authenticated binds we may need to do 3 or 4 leg binds. */
	switch(auth_type) {

		case PIPE_AUTH_TYPE_NONE:
		case PIPE_AUTH_TYPE_SCHANNEL:
			/* Bind complete. */
			break;

		case PIPE_AUTH_TYPE_NTLMSSP:
			/* Need to send AUTH3 packet - no reply. */
			status = rpc_finish_auth3_bind(cli, &hdr, &rbuf, rpc_call_id,
						auth_type, auth_level);
			if (!NT_STATUS_IS_OK(status)) {
				prs_mem_free(&rbuf);
				return status;
			}
			break;

		case PIPE_AUTH_TYPE_SPNEGO_NTLMSSP:
			/* Need to send alter context request and reply. */
			status = rpc_finish_spnego_ntlmssp_bind(cli, &hdr, &rbuf, rpc_call_id,
						&abstract, &transfer,
						auth_type, auth_level);
			if (!NT_STATUS_IS_OK(status)) {
				prs_mem_free(&rbuf);
				return status;
			}
			break;

		case PIPE_AUTH_TYPE_KRB5:
			/* */

		default:
			DEBUG(0,("cli_finish_bind_auth: unknown auth type %u\n",
				(unsigned int)auth_type ));
			prs_mem_free(&rbuf);
			return NT_STATUS_INVALID_INFO_CLASS;
	}

	/* For NTLMSSP ensure the server gave us the auth_level we wanted. */
	if (auth_type == PIPE_AUTH_TYPE_NTLMSSP || auth_type == PIPE_AUTH_TYPE_SPNEGO_NTLMSSP) {
		if (auth_level == PIPE_AUTH_LEVEL_INTEGRITY) {
			if (!(cli->auth.a_u.ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SIGN)) {
				DEBUG(0,("cli_finish_bind_auth: requested NTLMSSSP signing and server refused.\n"));
				prs_mem_free(&rbuf);
				return NT_STATUS_INVALID_PARAMETER;
			}
		}
		if (auth_level == PIPE_AUTH_LEVEL_INTEGRITY) {
			if (!(cli->auth.a_u.ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SEAL)) {
				DEBUG(0,("cli_finish_bind_auth: requested NTLMSSSP sealing and server refused.\n"));
				prs_mem_free(&rbuf);
				return NT_STATUS_INVALID_PARAMETER;
			}
		}
	}

	/* Pipe is bound - set up auth_type and auth_level data. */

	cli->auth.auth_type = auth_type;
	cli->auth.auth_level = auth_level;

	prs_mem_free(&rbuf);
	return NT_STATUS_OK;
}

/****************************************************************************
 Open a named pipe over SMB to a remote server.
 *
 * CAVEAT CALLER OF THIS FUNCTION:
 *    The returned rpc_pipe_client saves a copy of the cli_state cli pointer,
 *    so be sure that this function is called AFTER any structure (vs pointer)
 *    assignment of the cli.  In particular, libsmbclient does structure
 *    assignments of cli, which invalidates the data in the returned
 *    rpc_pipe_client if this function is called before the structure assignment
 *    of cli.
 * 
 ****************************************************************************/

static struct rpc_pipe_client *cli_rpc_pipe_open(struct cli_state *cli, int pipe_idx, NTSTATUS *perr)
{
	TALLOC_CTX *mem_ctx;
	struct rpc_pipe_client *result;
	int fnum;

	*perr = NT_STATUS_NO_MEMORY;

	/* sanity check to protect against crashes */

	if ( !cli ) {
		*perr = NT_STATUS_INVALID_HANDLE;
		return NULL;
	}

	/* The pipe name index must fall within our array */
	SMB_ASSERT((pipe_idx >= 0) && (pipe_idx < PI_MAX_PIPES));

	mem_ctx = talloc_init("struct rpc_pipe_client");
	if (mem_ctx == NULL) {
		return NULL;
	}

	result = TALLOC_ZERO_P(mem_ctx, struct rpc_pipe_client);
	if (result == NULL) {
		return NULL;
	}

	result->mem_ctx = mem_ctx;

	result->pipe_name = cli_get_pipe_name(pipe_idx);

	fnum = cli_nt_create(cli, result->pipe_name, DESIRED_ACCESS_PIPE);

	if (fnum == -1) {
		DEBUG(1,("cli_rpc_pipe_open: cli_nt_create failed on pipe %s "
			 "to machine %s.  Error was %s\n",
			 result->pipe_name, cli->desthost,
			 cli_errstr(cli)));
		*perr = cli_get_nt_error(cli);
		talloc_destroy(result->mem_ctx);
		return NULL;
	}

	result->fnum = fnum;
	result->cli = cli;
	result->pipe_idx = pipe_idx;
	result->auth.auth_type = PIPE_AUTH_TYPE_NONE;
	result->auth.auth_level = PIPE_AUTH_LEVEL_NONE;

	if (pipe_idx == PI_NETLOGON) {
		/* Set up a netlogon credential chain for a netlogon pipe. */
		result->dc = TALLOC_ZERO_P(mem_ctx, struct dcinfo);
		if (result->dc == NULL) {
			talloc_destroy(result->mem_ctx);
			return NULL;
		}
	}

	DLIST_ADD(cli->pipe_list, result);
	*perr = NT_STATUS_OK;

	return result;
}

/****************************************************************************
 Open a named pipe to an SMB server and bind anonymously.
 ****************************************************************************/

struct rpc_pipe_client *cli_rpc_pipe_open_noauth(struct cli_state *cli, int pipe_idx, NTSTATUS *perr)
{
	struct rpc_pipe_client *result;

	result = cli_rpc_pipe_open(cli, pipe_idx, perr);
	if (result == NULL) {
		return NULL;
	}

	*perr = rpc_pipe_bind(result, PIPE_AUTH_TYPE_NONE, PIPE_AUTH_LEVEL_NONE);
	if (!NT_STATUS_IS_OK(*perr)) {
		int lvl = 0;
		if (pipe_idx == PI_DSSETUP) {
			/* non AD domains just don't have this pipe, avoid
			 * level 0 statement in that case - gd */
			lvl = 3;
		}
		DEBUG(lvl, ("cli_rpc_pipe_open_noauth: rpc_pipe_bind for pipe %s failed with error %s\n",
			cli_get_pipe_name(pipe_idx), nt_errstr(*perr) ));
		cli_rpc_pipe_close(result);
		return NULL;
	}

	DEBUG(10,("cli_rpc_pipe_open_noauth: opened pipe %s to machine %s and bound anonymously.\n",
			result->pipe_name, cli->desthost ));

	return result;
}

/****************************************************************************
 Free function for NTLMSSP auth.
 ****************************************************************************/

static void cli_ntlmssp_auth_free(struct cli_pipe_auth_data *auth)
{
	if (auth->a_u.ntlmssp_state) {
		ntlmssp_end(&auth->a_u.ntlmssp_state);
		auth->a_u.ntlmssp_state = NULL;
	}
}

/****************************************************************************
 Open a named pipe to an SMB server and bind using NTLMSSP or SPNEGO NTLMSSP
 ****************************************************************************/

static struct rpc_pipe_client *cli_rpc_pipe_open_ntlmssp_internal(struct cli_state *cli,
						int pipe_idx,
						enum pipe_auth_type auth_type,
						enum pipe_auth_level auth_level,
						const char *domain,
						const char *username,
						const char *password,
						NTSTATUS *perr)
{
	struct rpc_pipe_client *result;
	NTLMSSP_STATE *ntlmssp_state = NULL;

	result = cli_rpc_pipe_open(cli, pipe_idx, perr);
	if (result == NULL) {
		return NULL;
	}
	
	result->auth.cli_auth_data_free_func = cli_ntlmssp_auth_free;

	result->domain = domain;
	result->user_name = username;
	pwd_set_cleartext(&result->pwd, password);

	*perr = ntlmssp_client_start(&ntlmssp_state);
	if (!NT_STATUS_IS_OK(*perr)) {
		goto err;
	}

	result->auth.a_u.ntlmssp_state = ntlmssp_state;

	*perr = ntlmssp_set_username(ntlmssp_state, cli->user_name);
	if (!NT_STATUS_IS_OK(*perr)) {
		goto err;
	}

	*perr = ntlmssp_set_domain(ntlmssp_state, cli->domain);	
	if (!NT_STATUS_IS_OK(*perr)) {
		goto err;
	}

	if (cli->pwd.null_pwd) {
		*perr = ntlmssp_set_password(ntlmssp_state, NULL);
		if (!NT_STATUS_IS_OK(*perr)) {
			goto err;
		}
	} else {
		*perr = ntlmssp_set_password(ntlmssp_state, password);
		if (!NT_STATUS_IS_OK(*perr)) {
			goto err;
		}
	}

	/* Turn off sign+seal to allow selected auth level to turn it back on. */
	ntlmssp_state->neg_flags &= ~(NTLMSSP_NEGOTIATE_SIGN|NTLMSSP_NEGOTIATE_SEAL);

	if (auth_level == PIPE_AUTH_LEVEL_INTEGRITY) {
		ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
	} else if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
		ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL | NTLMSSP_NEGOTIATE_SIGN;
	}
	
	*perr = rpc_pipe_bind(result, auth_type, auth_level);
	if (!NT_STATUS_IS_OK(*perr)) {
		DEBUG(0, ("cli_rpc_pipe_open_ntlmssp_internal: cli_rpc_pipe_bind failed with error %s\n",
			nt_errstr(*perr) ));
		goto err;
	}

	DEBUG(10,("cli_rpc_pipe_open_ntlmssp_internal: opened pipe %s to "
		"machine %s and bound NTLMSSP as user %s\\%s.\n",
		result->pipe_name, cli->desthost,
		domain, username ));

	return result;

  err:

	cli_rpc_pipe_close(result);
	return NULL;
}

/****************************************************************************
 External interface.
 Open a named pipe to an SMB server and bind using NTLMSSP (bind type 10)
 ****************************************************************************/

struct rpc_pipe_client *cli_rpc_pipe_open_ntlmssp(struct cli_state *cli,
						int pipe_idx,
						enum pipe_auth_level auth_level,
						const char *domain,
						const char *username,
						const char *password,
						NTSTATUS *perr)
{
	return cli_rpc_pipe_open_ntlmssp_internal(cli,
						pipe_idx,
						PIPE_AUTH_TYPE_NTLMSSP,
						auth_level,
						domain,
						username,
						password,
						perr);
}

/****************************************************************************
 External interface.
 Open a named pipe to an SMB server and bind using spnego NTLMSSP (bind type 9)
 ****************************************************************************/

struct rpc_pipe_client *cli_rpc_pipe_open_spnego_ntlmssp(struct cli_state *cli,
						int pipe_idx,
						enum pipe_auth_level auth_level,
						const char *domain,
						const char *username,
						const char *password,
						NTSTATUS *perr)
{
	return cli_rpc_pipe_open_ntlmssp_internal(cli,
						pipe_idx,
						PIPE_AUTH_TYPE_SPNEGO_NTLMSSP,
						auth_level,
						domain,
						username,
						password,
						perr);
}

/****************************************************************************
  Get a the schannel session key out of an already opened netlogon pipe.
 ****************************************************************************/
static bool get_schannel_session_key_common(struct rpc_pipe_client *netlogon_pipe,
					    struct cli_state *cli,
					    const char *domain,
					    uint32 *pneg_flags,
					    NTSTATUS *perr)
{
	uint32 sec_chan_type = 0;
	unsigned char machine_pwd[16];
	const char *machine_account;

	/* Get the machine account credentials from secrets.tdb. */
	if (!get_trust_pw_hash(domain, machine_pwd, &machine_account,
			       &sec_chan_type))
	{
		DEBUG(0, ("get_schannel_session_key: could not fetch "
			"trust account password for domain '%s'\n",
			domain));
		*perr = NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
		return false;
	}

	*perr = rpccli_netlogon_setup_creds(netlogon_pipe,
					cli->desthost, /* server name */
					domain,	       /* domain */
					global_myname(), /* client name */
					machine_account, /* machine account name */
					machine_pwd,
					sec_chan_type,
					pneg_flags);

	if (!NT_STATUS_IS_OK(*perr)) {
		DEBUG(3,("get_schannel_session_key_common: rpccli_netlogon_setup_creds "
			"failed with result %s to server %s, domain %s, machine account %s.\n",
			nt_errstr(*perr), cli->desthost, domain, machine_account ));
		return false;
	}

	if (((*pneg_flags) & NETLOGON_NEG_SCHANNEL) == 0) {
		DEBUG(3, ("get_schannel_session_key: Server %s did not offer schannel\n",
			cli->desthost));
		*perr = NT_STATUS_INVALID_NETWORK_RESPONSE;
		return false;
	}

	return true;
}

/****************************************************************************
 Open a netlogon pipe and get the schannel session key.
 Now exposed to external callers.
 ****************************************************************************/


struct rpc_pipe_client *get_schannel_session_key(struct cli_state *cli,
							const char *domain,
							uint32 *pneg_flags,
							NTSTATUS *perr)
{
	struct rpc_pipe_client *netlogon_pipe = NULL;

	netlogon_pipe = cli_rpc_pipe_open_noauth(cli, PI_NETLOGON, perr);
	if (!netlogon_pipe) {
		return NULL;
	}

	if (!get_schannel_session_key_common(netlogon_pipe, cli, domain,
					     pneg_flags, perr))
	{
		cli_rpc_pipe_close(netlogon_pipe);
		return NULL;
	}

	return netlogon_pipe;
}

/****************************************************************************
 External interface.
 Open a named pipe to an SMB server and bind using schannel (bind type 68)
 using session_key. sign and seal.
 ****************************************************************************/

struct rpc_pipe_client *cli_rpc_pipe_open_schannel_with_key(struct cli_state *cli,
					int pipe_idx,
					enum pipe_auth_level auth_level,
					const char *domain,
					const struct dcinfo *pdc,
					NTSTATUS *perr)
{
	struct rpc_pipe_client *result;

	result = cli_rpc_pipe_open(cli, pipe_idx, perr);
	if (result == NULL) {
		return NULL;
	}

	result->auth.a_u.schannel_auth = TALLOC_ZERO_P(result->mem_ctx, struct schannel_auth_struct);
	if (!result->auth.a_u.schannel_auth) {
		cli_rpc_pipe_close(result);
		*perr = NT_STATUS_NO_MEMORY;
		return NULL;
	}

	result->domain = domain;
	memcpy(result->auth.a_u.schannel_auth->sess_key, pdc->sess_key, 16);

	*perr = rpc_pipe_bind(result, PIPE_AUTH_TYPE_SCHANNEL, auth_level);
	if (!NT_STATUS_IS_OK(*perr)) {
		DEBUG(0, ("cli_rpc_pipe_open_schannel_with_key: cli_rpc_pipe_bind failed with error %s\n",
			nt_errstr(*perr) ));
		cli_rpc_pipe_close(result);
		return NULL;
	}

	/* The credentials on a new netlogon pipe are the ones we are passed in - copy them over. */
	if (result->dc) {
		*result->dc = *pdc;
	}

	DEBUG(10,("cli_rpc_pipe_open_schannel_with_key: opened pipe %s to machine %s "
		"for domain %s "
		"and bound using schannel.\n",
		result->pipe_name, cli->desthost, domain ));

	return result;
}

/****************************************************************************
 Open a named pipe to an SMB server and bind using schannel (bind type 68).
 Fetch the session key ourselves using a temporary netlogon pipe. This
 version uses an ntlmssp auth bound netlogon pipe to get the key.
 ****************************************************************************/

static struct rpc_pipe_client *get_schannel_session_key_auth_ntlmssp(struct cli_state *cli,
							const char *domain,
							const char *username,
							const char *password,
							uint32 *pneg_flags,
							NTSTATUS *perr)
{
	struct rpc_pipe_client *netlogon_pipe = NULL;

	netlogon_pipe = cli_rpc_pipe_open_spnego_ntlmssp(cli, PI_NETLOGON, PIPE_AUTH_LEVEL_PRIVACY, domain, username, password, perr);
	if (!netlogon_pipe) {
		return NULL;
	}

	if (!get_schannel_session_key_common(netlogon_pipe, cli, domain,
					     pneg_flags, perr))
	{
		cli_rpc_pipe_close(netlogon_pipe);
		return NULL;
	}

	return netlogon_pipe;
}

/****************************************************************************
 Open a named pipe to an SMB server and bind using schannel (bind type 68).
 Fetch the session key ourselves using a temporary netlogon pipe. This version
 uses an ntlmssp bind to get the session key.
 ****************************************************************************/

struct rpc_pipe_client *cli_rpc_pipe_open_ntlmssp_auth_schannel(struct cli_state *cli,
                                                int pipe_idx,
						enum pipe_auth_level auth_level,
                                                const char *domain,
						const char *username,
						const char *password,
						NTSTATUS *perr)
{
	uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
	struct rpc_pipe_client *netlogon_pipe = NULL;
	struct rpc_pipe_client *result = NULL;

	netlogon_pipe = get_schannel_session_key_auth_ntlmssp(cli, domain, username,
							password, &neg_flags, perr);
	if (!netlogon_pipe) {
		DEBUG(0,("cli_rpc_pipe_open_ntlmssp_auth_schannel: failed to get schannel session "
			"key from server %s for domain %s.\n",
			cli->desthost, domain ));
		return NULL;
	}

	result = cli_rpc_pipe_open_schannel_with_key(cli, pipe_idx,
				auth_level,
				domain, netlogon_pipe->dc, perr);

	/* Now we've bound using the session key we can close the netlog pipe. */
	cli_rpc_pipe_close(netlogon_pipe);

	return result;
}

/****************************************************************************
 Open a named pipe to an SMB server and bind using schannel (bind type 68).
 Fetch the session key ourselves using a temporary netlogon pipe.
 ****************************************************************************/

struct rpc_pipe_client *cli_rpc_pipe_open_schannel(struct cli_state *cli,
                                                int pipe_idx,
						enum pipe_auth_level auth_level,
                                                const char *domain,
						NTSTATUS *perr)
{
	uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
	struct rpc_pipe_client *netlogon_pipe = NULL;
	struct rpc_pipe_client *result = NULL;

	netlogon_pipe = get_schannel_session_key(cli, domain, &neg_flags, perr);
	if (!netlogon_pipe) {
		DEBUG(0,("cli_rpc_pipe_open_schannel: failed to get schannel session "
			"key from server %s for domain %s.\n",
			cli->desthost, domain ));
		return NULL;
	}

	result = cli_rpc_pipe_open_schannel_with_key(cli, pipe_idx,
				auth_level,
				domain, netlogon_pipe->dc, perr);

	/* Now we've bound using the session key we can close the netlog pipe. */
	cli_rpc_pipe_close(netlogon_pipe);

	return result;
}

#ifdef HAVE_KRB5

/****************************************************************************
 Free function for the kerberos spcific data.
 ****************************************************************************/

static void kerberos_auth_struct_free(struct cli_pipe_auth_data *a)
{
	data_blob_free(&a->a_u.kerberos_auth->session_key);
}

#endif

/****************************************************************************
 Open a named pipe to an SMB server and bind using krb5 (bind type 16).
 The idea is this can be called with service_princ, username and password all
 NULL so long as the caller has a TGT.
 ****************************************************************************/

struct rpc_pipe_client *cli_rpc_pipe_open_krb5(struct cli_state *cli,
						int pipe_idx,
						enum pipe_auth_level auth_level,
						const char *service_princ,
						const char *username,
						const char *password,
						NTSTATUS *perr)
{
#ifdef HAVE_KRB5
	struct rpc_pipe_client *result;

	result = cli_rpc_pipe_open(cli, pipe_idx, perr);
	if (result == NULL) {
		return NULL;
	}

	/* Default service principal is "desthost$@realm" */
	if (!service_princ) {
		service_princ = talloc_asprintf(result->mem_ctx, "%s$@%s",
			cli->desthost, lp_realm() );
		if (!service_princ) {
			cli_rpc_pipe_close(result);
			return NULL;
		}
	}

	/* Only get a new TGT if username/password are given. */
	if (username && password) {
		int ret = kerberos_kinit_password(username, password, 0, NULL);
		if (ret) {
			cli_rpc_pipe_close(result);
			return NULL;
		}
	}

	result->auth.a_u.kerberos_auth = TALLOC_ZERO_P(result->mem_ctx, struct kerberos_auth_struct);
	if (!result->auth.a_u.kerberos_auth) {
		cli_rpc_pipe_close(result);
		*perr = NT_STATUS_NO_MEMORY;
		return NULL;
	}

	result->auth.a_u.kerberos_auth->service_principal = service_princ;
	result->auth.cli_auth_data_free_func = kerberos_auth_struct_free;

	*perr = rpc_pipe_bind(result, PIPE_AUTH_TYPE_KRB5, auth_level);
	if (!NT_STATUS_IS_OK(*perr)) {
		DEBUG(0, ("cli_rpc_pipe_open_krb5: cli_rpc_pipe_bind failed with error %s\n",
			nt_errstr(*perr) ));
		cli_rpc_pipe_close(result);
		return NULL;
	}

	return result;
#else
	DEBUG(0,("cli_rpc_pipe_open_krb5: kerberos not found at compile time.\n"));
	return NULL;
#endif
}