aboutsummaryrefslogtreecommitdiffstats
path: root/source4/dsdb/samdb/ldb_modules/repl_meta_data.c
blob: f07dc1411b2e74a5c530f61c2c6ae143323dc436 (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
/* 
   ldb database library

   Copyright (C) Simo Sorce  2004-2008
   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   Copyright (C) Andrew Tridgell 2005
   Copyright (C) Stefan Metzmacher <metze@samba.org> 2007

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

/*
 *  Name: ldb
 *
 *  Component: ldb repl_meta_data module
 *
 *  Description: - add a unique objectGUID onto every new record,
 *               - handle whenCreated, whenChanged timestamps
 *               - handle uSNCreated, uSNChanged numbers
 *               - handle replPropertyMetaData attribute
 *
 *  Author: Simo Sorce
 *  Author: Stefan Metzmacher
 */

#include "includes.h"
#include "ldb_module.h"
#include "dsdb/samdb/samdb.h"
#include "dsdb/common/proto.h"
#include "../libds/common/flags.h"
#include "librpc/gen_ndr/ndr_misc.h"
#include "librpc/gen_ndr/ndr_drsuapi.h"
#include "librpc/gen_ndr/ndr_drsblobs.h"
#include "param/param.h"
#include "libcli/security/dom_sid.h"
#include "lib/util/dlinklist.h"

struct replmd_private {
	TALLOC_CTX *la_ctx;
	struct la_entry *la_list;
	uint32_t num_ncs;
	struct nc_entry {
		struct ldb_dn *dn;
		struct GUID guid;
		uint64_t mod_usn;
	} *ncs;
};

struct la_entry {
	struct la_entry *next, *prev;
	struct drsuapi_DsReplicaLinkedAttribute *la;
};

struct replmd_replicated_request {
	struct ldb_module *module;
	struct ldb_request *req;

	const struct dsdb_schema *schema;

	struct dsdb_extended_replicated_objects *objs;

	/* the controls we pass down */
	struct ldb_control **controls;

	uint32_t index_current;

	struct ldb_message *search_msg;
};


/*
  initialise the module
  allocate the private structure and build the list
  of partition DNs for use by replmd_notify()
 */
static int replmd_init(struct ldb_module *module)
{
	struct replmd_private *replmd_private;
	struct ldb_context *ldb = ldb_module_get_ctx(module);

	replmd_private = talloc_zero(module, struct replmd_private);
	if (replmd_private == NULL) {
		ldb_oom(ldb);
		return LDB_ERR_OPERATIONS_ERROR;
	}
	ldb_module_set_private(module, replmd_private);

	return ldb_next_init(module);
}


static int nc_compare(struct nc_entry *n1, struct nc_entry *n2)
{
	return ldb_dn_compare(n1->dn, n2->dn);
}

/*
  build the list of partition DNs for use by replmd_notify()
 */
static int replmd_load_NCs(struct ldb_module *module)
{
	const char *attrs[] = { "namingContexts", NULL };
	struct ldb_result *res = NULL;
	int i, ret;
	TALLOC_CTX *tmp_ctx;
	struct ldb_context *ldb;
	struct ldb_message_element *el;
	struct replmd_private *replmd_private = 
		talloc_get_type(ldb_module_get_private(module), struct replmd_private);

	if (replmd_private->ncs != NULL) {
		return LDB_SUCCESS;
	}

	ldb = ldb_module_get_ctx(module);
	tmp_ctx = talloc_new(module);

	/* load the list of naming contexts */
	ret = ldb_search(ldb, tmp_ctx, &res, ldb_dn_new(tmp_ctx, ldb, ""), 
			 LDB_SCOPE_BASE, attrs, NULL);
	if (ret != LDB_SUCCESS ||
	    res->count != 1) {
		DEBUG(0,(__location__ ": Failed to load rootDSE\n"));
		return LDB_ERR_OPERATIONS_ERROR;
	}

	el = ldb_msg_find_element(res->msgs[0], "namingContexts");
	if (el == NULL) {
		DEBUG(0,(__location__ ": Failed to load namingContexts\n"));
		return LDB_ERR_OPERATIONS_ERROR;		
	}

	replmd_private->num_ncs = el->num_values;
	replmd_private->ncs = talloc_array(replmd_private, struct nc_entry, 
					   replmd_private->num_ncs);
	if (replmd_private->ncs == NULL) {
		ldb_oom(ldb);
		return LDB_ERR_OPERATIONS_ERROR;
	}

	for (i=0; i<replmd_private->num_ncs; i++) {
		replmd_private->ncs[i].dn = 
			ldb_dn_from_ldb_val(replmd_private->ncs, 
					    ldb, &el->values[i]);
		replmd_private->ncs[i].mod_usn = 0;
	}

	talloc_free(res);

	/* now find the GUIDs of each of those DNs */
	for (i=0; i<replmd_private->num_ncs; i++) {
		const char *attrs2[] = { "objectGUID", NULL };
		ret = ldb_search(ldb, tmp_ctx, &res, replmd_private->ncs[i].dn,
				 LDB_SCOPE_BASE, attrs2, NULL);
		if (ret != LDB_SUCCESS ||
		    res->count != 1) {
			/* this happens when the schema is first being
			   setup */
			talloc_free(replmd_private->ncs);
			replmd_private->ncs = NULL;
			replmd_private->num_ncs = 0;
			talloc_free(tmp_ctx);
			return LDB_SUCCESS;
		}
		replmd_private->ncs[i].guid = 
			samdb_result_guid(res->msgs[0], "objectGUID");
		talloc_free(res);
	}	

	/* sort the NCs into order, most to least specific */
	qsort(replmd_private->ncs, replmd_private->num_ncs,
	      sizeof(replmd_private->ncs[0]), QSORT_CAST nc_compare);

	
	talloc_free(tmp_ctx);
	
	return LDB_SUCCESS;
}


/*
 * notify the repl task that a object has changed. The notifies are
 * gathered up in the replmd_private structure then written to the
 * @REPLCHANGED object in each partition during the prepare_commit
 */
static int replmd_notify(struct ldb_module *module, struct ldb_dn *dn, uint64_t uSN)
{
	int ret, i;
	struct replmd_private *replmd_private = 
		talloc_get_type(ldb_module_get_private(module), struct replmd_private);

	ret = replmd_load_NCs(module);
	if (ret != LDB_SUCCESS) {
		return ret;
	}
	if (replmd_private->num_ncs == 0) {
		return LDB_SUCCESS;
	}

	for (i=0; i<replmd_private->num_ncs; i++) {
		if (ldb_dn_compare_base(replmd_private->ncs[i].dn, dn) == 0) {
			break;
		}
	}
	if (i == replmd_private->num_ncs) {
		DEBUG(0,(__location__ ": DN not within known NCs '%s'\n", 
			 ldb_dn_get_linearized(dn)));
		return LDB_ERR_OPERATIONS_ERROR;
	}

	if (uSN > replmd_private->ncs[i].mod_usn) {
	    replmd_private->ncs[i].mod_usn = uSN;
	}

	return LDB_SUCCESS;
}


/*
 * update a @REPLCHANGED record in each partition if there have been
 * any writes of replicated data in the partition
 */
static int replmd_notify_store(struct ldb_module *module)
{
	int i;
	struct replmd_private *replmd_private = 
		talloc_get_type(ldb_module_get_private(module), struct replmd_private);
	struct ldb_context *ldb = ldb_module_get_ctx(module);

	for (i=0; i<replmd_private->num_ncs; i++) {
		int ret;

		if (replmd_private->ncs[i].mod_usn == 0) {
			/* this partition has not changed in this
			   transaction */
			continue;
		}

		ret = dsdb_save_partition_usn(ldb, replmd_private->ncs[i].dn, 
					      replmd_private->ncs[i].mod_usn);
		if (ret != LDB_SUCCESS) {
			DEBUG(0,(__location__ ": Failed to save partition uSN for %s\n",
				 ldb_dn_get_linearized(replmd_private->ncs[i].dn)));
			return ret;
		}
	}

	return LDB_SUCCESS;
}


/*
  created a replmd_replicated_request context
 */
static struct replmd_replicated_request *replmd_ctx_init(struct ldb_module *module,
							 struct ldb_request *req)
{
	struct ldb_context *ldb;
	struct replmd_replicated_request *ac;

	ldb = ldb_module_get_ctx(module);

	ac = talloc_zero(req, struct replmd_replicated_request);
	if (ac == NULL) {
		ldb_oom(ldb);
		return NULL;
	}

	ac->module = module;
	ac->req	= req;
	return ac;
}

/*
  add a time element to a record
*/
static int add_time_element(struct ldb_message *msg, const char *attr, time_t t)
{
	struct ldb_message_element *el;
	char *s;

	if (ldb_msg_find_element(msg, attr) != NULL) {
		return LDB_SUCCESS;
	}

	s = ldb_timestring(msg, t);
	if (s == NULL) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	if (ldb_msg_add_string(msg, attr, s) != LDB_SUCCESS) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	el = ldb_msg_find_element(msg, attr);
	/* always set as replace. This works because on add ops, the flag
	   is ignored */
	el->flags = LDB_FLAG_MOD_REPLACE;

	return LDB_SUCCESS;
}

/*
  add a uint64_t element to a record
*/
static int add_uint64_element(struct ldb_message *msg, const char *attr, uint64_t v)
{
	struct ldb_message_element *el;

	if (ldb_msg_find_element(msg, attr) != NULL) {
		return LDB_SUCCESS;
	}

	if (ldb_msg_add_fmt(msg, attr, "%llu", (unsigned long long)v) != LDB_SUCCESS) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	el = ldb_msg_find_element(msg, attr);
	/* always set as replace. This works because on add ops, the flag
	   is ignored */
	el->flags = LDB_FLAG_MOD_REPLACE;

	return LDB_SUCCESS;
}

static int replmd_replPropertyMetaData1_attid_sort(const struct replPropertyMetaData1 *m1,
						   const struct replPropertyMetaData1 *m2,
						   const uint32_t *rdn_attid)
{
	if (m1->attid == m2->attid) {
		return 0;
	}

	/*
	 * the rdn attribute should be at the end!
	 * so we need to return a value greater than zero
	 * which means m1 is greater than m2
	 */
	if (m1->attid == *rdn_attid) {
		return 1;
	}

	/*
	 * the rdn attribute should be at the end!
	 * so we need to return a value less than zero
	 * which means m2 is greater than m1
	 */
	if (m2->attid == *rdn_attid) {
		return -1;
	}

	return m1->attid - m2->attid;
}

static void replmd_replPropertyMetaDataCtr1_sort(struct replPropertyMetaDataCtr1 *ctr1,
						 const uint32_t *rdn_attid)
{
	ldb_qsort(ctr1->array, ctr1->count, sizeof(struct replPropertyMetaData1),
		  discard_const_p(void, rdn_attid), (ldb_qsort_cmp_fn_t)replmd_replPropertyMetaData1_attid_sort);
}

static int replmd_ldb_message_element_attid_sort(const struct ldb_message_element *e1,
						 const struct ldb_message_element *e2,
						 const struct dsdb_schema *schema)
{
	const struct dsdb_attribute *a1;
	const struct dsdb_attribute *a2;

	/* 
	 * TODO: make this faster by caching the dsdb_attribute pointer
	 *       on the ldb_messag_element
	 */

	a1 = dsdb_attribute_by_lDAPDisplayName(schema, e1->name);
	a2 = dsdb_attribute_by_lDAPDisplayName(schema, e2->name);

	/*
	 * TODO: remove this check, we should rely on e1 and e2 having valid attribute names
	 *       in the schema
	 */
	if (!a1 || !a2) {
		return strcasecmp(e1->name, e2->name);
	}

	return a1->attributeID_id - a2->attributeID_id;
}

static void replmd_ldb_message_sort(struct ldb_message *msg,
				    const struct dsdb_schema *schema)
{
	ldb_qsort(msg->elements, msg->num_elements, sizeof(struct ldb_message_element),
		  discard_const_p(void, schema), (ldb_qsort_cmp_fn_t)replmd_ldb_message_element_attid_sort);
}

static int replmd_op_callback(struct ldb_request *req, struct ldb_reply *ares)
{
	struct ldb_context *ldb;
	struct replmd_replicated_request *ac;

	ac = talloc_get_type(req->context, struct replmd_replicated_request);
	ldb = ldb_module_get_ctx(ac->module);

	if (!ares) {
		return ldb_module_done(ac->req, NULL, NULL,
					LDB_ERR_OPERATIONS_ERROR);
	}
	if (ares->error != LDB_SUCCESS) {
		return ldb_module_done(ac->req, ares->controls,
					ares->response, ares->error);
	}

	if (ares->type != LDB_REPLY_DONE) {
		ldb_set_errstring(ldb,
				  "invalid ldb_reply_type in callback");
		talloc_free(ares);
		return ldb_module_done(ac->req, NULL, NULL,
					LDB_ERR_OPERATIONS_ERROR);
	}

	return ldb_module_done(ac->req, ares->controls,
				ares->response, LDB_SUCCESS);
}

static int replmd_add(struct ldb_module *module, struct ldb_request *req)
{
	struct ldb_context *ldb;
	struct replmd_replicated_request *ac;
	const struct dsdb_schema *schema;
	enum ndr_err_code ndr_err;
	struct ldb_request *down_req;
	struct ldb_message *msg;
	const struct dsdb_attribute *rdn_attr = NULL;
	struct GUID guid;
	struct ldb_val guid_value;
	struct replPropertyMetaDataBlob nmd;
	struct ldb_val nmd_value;
	uint64_t seq_num;
	const struct GUID *our_invocation_id;
	time_t t = time(NULL);
	NTTIME now;
	char *time_str;
	int ret;
	uint32_t i, ni=0;

	/* do not manipulate our control entries */
	if (ldb_dn_is_special(req->op.add.message->dn)) {
		return ldb_next_request(module, req);
	}

	ldb = ldb_module_get_ctx(module);

	ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_add\n");

	schema = dsdb_get_schema(ldb);
	if (!schema) {
		ldb_debug_set(ldb, LDB_DEBUG_FATAL,
			      "replmd_add: no dsdb_schema loaded");
		DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
		return LDB_ERR_CONSTRAINT_VIOLATION;
	}

	ac = replmd_ctx_init(module, req);
	if (!ac) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	ac->schema = schema;

	if (ldb_msg_find_element(req->op.add.message, "objectGUID") != NULL) {
		ldb_debug_set(ldb, LDB_DEBUG_ERROR,
			      "replmd_add: it's not allowed to add an object with objectGUID\n");
		return LDB_ERR_UNWILLING_TO_PERFORM;
	}

	/* Get a sequence number from the backend */
	ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
	if (ret != LDB_SUCCESS) {
		return ret;
	}

	/* a new GUID */
	guid = GUID_random();

	/* get our invocationId */
	our_invocation_id = samdb_ntds_invocation_id(ldb);
	if (!our_invocation_id) {
		ldb_debug_set(ldb, LDB_DEBUG_ERROR,
			      "replmd_add: unable to find invocationId\n");
		return LDB_ERR_OPERATIONS_ERROR;
	}

	/* we have to copy the message as the caller might have it as a const */
	msg = ldb_msg_copy_shallow(ac, req->op.add.message);
	if (msg == NULL) {
		ldb_oom(ldb);
		return LDB_ERR_OPERATIONS_ERROR;
	}

	/* generated times */
	unix_to_nt_time(&now, t);
	time_str = ldb_timestring(msg, t);
	if (!time_str) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	/* 
	 * remove autogenerated attributes
	 */
	ldb_msg_remove_attr(msg, "whenCreated");
	ldb_msg_remove_attr(msg, "whenChanged");
	ldb_msg_remove_attr(msg, "uSNCreated");
	ldb_msg_remove_attr(msg, "uSNChanged");
	ldb_msg_remove_attr(msg, "replPropertyMetaData");

	if (!ldb_msg_find_element(req->op.add.message, "instanceType")) {
		ret = ldb_msg_add_fmt(msg, "instanceType", "%u", INSTANCE_TYPE_WRITE);
		if (ret != LDB_SUCCESS) {
			ldb_oom(ldb);
			return LDB_ERR_OPERATIONS_ERROR;
		}
	}

	/*
	 * readd replicated attributes
	 */
	ret = ldb_msg_add_string(msg, "whenCreated", time_str);
	if (ret != LDB_SUCCESS) {
		ldb_oom(ldb);
		return LDB_ERR_OPERATIONS_ERROR;
	}

	/* build the replication meta_data */
	ZERO_STRUCT(nmd);
	nmd.version		= 1;
	nmd.ctr.ctr1.count	= msg->num_elements;
	nmd.ctr.ctr1.array	= talloc_array(msg,
					       struct replPropertyMetaData1,
					       nmd.ctr.ctr1.count);
	if (!nmd.ctr.ctr1.array) {
		ldb_oom(ldb);
		return LDB_ERR_OPERATIONS_ERROR;
	}

	for (i=0; i < msg->num_elements; i++) {
		struct ldb_message_element *e = &msg->elements[i];
		struct replPropertyMetaData1 *m = &nmd.ctr.ctr1.array[ni];
		const struct dsdb_attribute *sa;

		if (e->name[0] == '@') continue;

		sa = dsdb_attribute_by_lDAPDisplayName(schema, e->name);
		if (!sa) {
			ldb_debug_set(ldb, LDB_DEBUG_ERROR,
				      "replmd_add: attribute '%s' not defined in schema\n",
				      e->name);
			return LDB_ERR_NO_SUCH_ATTRIBUTE;
		}

		if ((sa->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (sa->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
			/* if the attribute is not replicated (0x00000001)
			 * or constructed (0x00000004) it has no metadata
			 */
			continue;
		}

		m->attid			= sa->attributeID_id;
		m->version			= 1;
		m->originating_change_time	= now;
		m->originating_invocation_id	= *our_invocation_id;
		m->originating_usn		= seq_num;
		m->local_usn			= seq_num;
		ni++;

		if (ldb_attr_cmp(e->name, ldb_dn_get_rdn_name(msg->dn))) {
			rdn_attr = sa;
		}
	}

	/* fix meta data count */
	nmd.ctr.ctr1.count = ni;

	/*
	 * sort meta data array, and move the rdn attribute entry to the end
	 */
	replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, &rdn_attr->attributeID_id);

	/* generated NDR encoded values */
	ndr_err = ndr_push_struct_blob(&guid_value, msg, 
				       NULL,
				       &guid,
				       (ndr_push_flags_fn_t)ndr_push_GUID);
	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
		ldb_oom(ldb);
		return LDB_ERR_OPERATIONS_ERROR;
	}
	ndr_err = ndr_push_struct_blob(&nmd_value, msg, 
				       lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
				       &nmd,
				       (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
		ldb_oom(ldb);
		return LDB_ERR_OPERATIONS_ERROR;
	}

	/*
	 * add the autogenerated values
	 */
	ret = ldb_msg_add_value(msg, "objectGUID", &guid_value, NULL);
	if (ret != LDB_SUCCESS) {
		ldb_oom(ldb);
		return LDB_ERR_OPERATIONS_ERROR;
	}
	ret = ldb_msg_add_string(msg, "whenChanged", time_str);
	if (ret != LDB_SUCCESS) {
		ldb_oom(ldb);
		return LDB_ERR_OPERATIONS_ERROR;
	}
	ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", seq_num);
	if (ret != LDB_SUCCESS) {
		ldb_oom(ldb);
		return LDB_ERR_OPERATIONS_ERROR;
	}
	ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", seq_num);
	if (ret != LDB_SUCCESS) {
		ldb_oom(ldb);
		return LDB_ERR_OPERATIONS_ERROR;
	}
	ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
	if (ret != LDB_SUCCESS) {
		ldb_oom(ldb);
		return LDB_ERR_OPERATIONS_ERROR;
	}

	/*
	 * sort the attributes by attid before storing the object
	 */
	replmd_ldb_message_sort(msg, schema);

	ret = ldb_build_add_req(&down_req, ldb, ac,
				msg,
				req->controls,
				ac, replmd_op_callback,
				req);
	if (ret != LDB_SUCCESS) {
		return ret;
	}

	ret = replmd_notify(module, msg->dn, seq_num);
	if (ret != LDB_SUCCESS) {
		return ret;
	}

	/* go on with the call chain */
	return ldb_next_request(module, down_req);
}


/*
 * update the replPropertyMetaData for one element
 */
static int replmd_update_rpmd_element(struct ldb_context *ldb, 
				      struct ldb_message *msg,
				      struct ldb_message_element *el,
				      struct replPropertyMetaDataBlob *omd,
				      struct dsdb_schema *schema,
				      uint64_t *seq_num,
				      const struct GUID *our_invocation_id,
				      NTTIME now)
{
	int i;
	const struct dsdb_attribute *a;
	struct replPropertyMetaData1 *md1;

	a = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
	if (a == NULL) {
		DEBUG(0,(__location__ ": Unable to find attribute %s in schema\n",
			 el->name));
		return LDB_ERR_OPERATIONS_ERROR;
	}

	if ((a->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (a->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
		return LDB_SUCCESS;
	}

	for (i=0; i<omd->ctr.ctr1.count; i++) {
		if (a->attributeID_id == omd->ctr.ctr1.array[i].attid) break;
	}
	if (i == omd->ctr.ctr1.count) {
		/* we need to add a new one */
		omd->ctr.ctr1.array = talloc_realloc(msg, omd->ctr.ctr1.array, 
						     struct replPropertyMetaData1, omd->ctr.ctr1.count+1);
		if (omd->ctr.ctr1.array == NULL) {
			ldb_oom(ldb);
			return LDB_ERR_OPERATIONS_ERROR;
		}
		omd->ctr.ctr1.count++;
		ZERO_STRUCT(omd->ctr.ctr1.array[i]);
	}

	/* Get a new sequence number from the backend. We only do this
	 * if we have a change that requires a new
	 * replPropertyMetaData element 
	 */
	if (*seq_num == 0) {
		int ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num);
		if (ret != LDB_SUCCESS) {
			return LDB_ERR_OPERATIONS_ERROR;
		}
	}

	md1 = &omd->ctr.ctr1.array[i];
	md1->version++;
	md1->attid                     = a->attributeID_id;
	md1->originating_change_time   = now;
	md1->originating_invocation_id = *our_invocation_id;
	md1->originating_usn           = *seq_num;
	md1->local_usn                 = *seq_num;
	
	return LDB_SUCCESS;
}

/*
 * update the replPropertyMetaData object each time we modify an
 * object. This is needed for DRS replication, as the merge on the
 * client is based on this object 
 */
static int replmd_update_rpmd(struct ldb_module *module, 
			      struct ldb_message *msg, uint64_t *seq_num)
{
	const struct ldb_val *omd_value;
	enum ndr_err_code ndr_err;
	struct replPropertyMetaDataBlob omd;
	int i;
	struct dsdb_schema *schema;
	time_t t = time(NULL);
	NTTIME now;
	const struct GUID *our_invocation_id;
	int ret;
	const char *attrs[] = { "replPropertyMetaData" , NULL };
	struct ldb_result *res;
	struct ldb_context *ldb;

	ldb = ldb_module_get_ctx(module);

	our_invocation_id = samdb_ntds_invocation_id(ldb);
	if (!our_invocation_id) {
		/* this happens during an initial vampire while
		   updating the schema */
		DEBUG(5,("No invocationID - skipping replPropertyMetaData update\n"));
		return LDB_SUCCESS;
	}

	unix_to_nt_time(&now, t);

	/* search for the existing replPropertyMetaDataBlob */
	ret = ldb_search(ldb, msg, &res, msg->dn, LDB_SCOPE_BASE, attrs, NULL);
	if (ret != LDB_SUCCESS || res->count < 1) {
		DEBUG(0,(__location__ ": Object %s failed to find replPropertyMetaData\n",
			 ldb_dn_get_linearized(msg->dn)));
		return LDB_ERR_OPERATIONS_ERROR;
	}
		

	omd_value = ldb_msg_find_ldb_val(res->msgs[0], "replPropertyMetaData");
	if (!omd_value) {
		DEBUG(0,(__location__ ": Object %s does not have a replPropertyMetaData attribute\n",
			 ldb_dn_get_linearized(msg->dn)));
		return LDB_ERR_OPERATIONS_ERROR;
	}

	ndr_err = ndr_pull_struct_blob(omd_value, msg,
				       lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &omd,
				       (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
		DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
			 ldb_dn_get_linearized(msg->dn)));
		return LDB_ERR_OPERATIONS_ERROR;
	}

	if (omd.version != 1) {
		DEBUG(0,(__location__ ": bad version %u in replPropertyMetaData for %s\n",
			 omd.version, ldb_dn_get_linearized(msg->dn)));
		return LDB_ERR_OPERATIONS_ERROR;
	}

	schema = dsdb_get_schema(ldb);

	for (i=0; i<msg->num_elements; i++) {
		ret = replmd_update_rpmd_element(ldb, msg, &msg->elements[i], &omd, schema, seq_num, 
						 our_invocation_id, now);
		if (ret != LDB_SUCCESS) {
			return ret;
		}
	}

	/*
	 * replmd_update_rpmd_element has done an update if the
	 * seq_num is set
	 */
	if (*seq_num != 0) {
		struct ldb_val *md_value;
		struct ldb_message_element *el;
		const char *rdn_name;
		const struct dsdb_attribute *rdn_sa;

		rdn_name = ldb_dn_get_rdn_name(msg->dn);
		if (!rdn_name) {
			DEBUG(0,(__location__ ": No rDN for %s?\n", ldb_dn_get_linearized(msg->dn)));
			return LDB_ERR_OPERATIONS_ERROR;
		}
		rdn_sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
		if (rdn_sa == NULL) {
			DEBUG(0,(__location__ ": sa not found for rDN %s in %s?\n", 
				 rdn_name, ldb_dn_get_linearized(msg->dn)));
			return LDB_ERR_OPERATIONS_ERROR;
		}

		md_value = talloc(msg, struct ldb_val);
		if (md_value == NULL) {
			ldb_oom(ldb);
			return LDB_ERR_OPERATIONS_ERROR;
		}

		replmd_replPropertyMetaDataCtr1_sort(&omd.ctr.ctr1, &rdn_sa->attributeID_id);

		ndr_err = ndr_push_struct_blob(md_value, msg, 
					       lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
					       &omd,
					       (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
		if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
			DEBUG(0,(__location__ ": Failed to marshall replPropertyMetaData for %s\n",
				 ldb_dn_get_linearized(msg->dn)));
			return LDB_ERR_OPERATIONS_ERROR;
		}

		ret = ldb_msg_add_empty(msg, "replPropertyMetaData", LDB_FLAG_MOD_REPLACE, &el);
		if (ret != LDB_SUCCESS) {
			DEBUG(0,(__location__ ": Failed to add updated replPropertyMetaData %s\n",
				 ldb_dn_get_linearized(msg->dn)));
			return ret;
		}

		ret = replmd_notify(module, msg->dn, *seq_num);
		if (ret != LDB_SUCCESS) {
			return ret;
		}

		el->num_values = 1;
		el->values = md_value;
	}

	return LDB_SUCCESS;	
}


static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
{
	struct ldb_context *ldb;
	struct replmd_replicated_request *ac;
	const struct dsdb_schema *schema;
	struct ldb_request *down_req;
	struct ldb_message *msg;
	int ret;
	time_t t = time(NULL);
	uint64_t seq_num = 0;

	/* do not manipulate our control entries */
	if (ldb_dn_is_special(req->op.mod.message->dn)) {
		return ldb_next_request(module, req);
	}

	ldb = ldb_module_get_ctx(module);

	ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_modify\n");

	schema = dsdb_get_schema(ldb);
	if (!schema) {
		ldb_debug_set(ldb, LDB_DEBUG_FATAL,
			      "replmd_modify: no dsdb_schema loaded");
		DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
		return LDB_ERR_CONSTRAINT_VIOLATION;
	}

	ac = replmd_ctx_init(module, req);
	if (!ac) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	ac->schema = schema;

	/* we have to copy the message as the caller might have it as a const */
	msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
	if (msg == NULL) {
		talloc_free(ac);
		return LDB_ERR_OPERATIONS_ERROR;
	}

	/* TODO:
	 * - get the whole old object
	 * - if the old object doesn't exist report an error
	 * - give an error when a readonly attribute should
	 *   be modified
	 * - merge the changed into the old object
	 *   if the caller set values to the same value
	 *   ignore the attribute, return success when no
	 *   attribute was changed
	 */

	ret = replmd_update_rpmd(module, msg, &seq_num);
	if (ret != LDB_SUCCESS) {
		return ret;
	}

	/* TODO:
	 * - replace the old object with the newly constructed one
	 */

	ret = ldb_build_mod_req(&down_req, ldb, ac,
				msg,
				req->controls,
				ac, replmd_op_callback,
				req);
	if (ret != LDB_SUCCESS) {
		return ret;
	}
	talloc_steal(down_req, msg);

	/* we only change whenChanged and uSNChanged if the seq_num
	   has changed */
	if (seq_num != 0) {
		if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
			talloc_free(ac);
			return LDB_ERR_OPERATIONS_ERROR;
		}

		if (add_uint64_element(msg, "uSNChanged", seq_num) != LDB_SUCCESS) {
			talloc_free(ac);
			return LDB_ERR_OPERATIONS_ERROR;
		}
	}

	/* go on with the call chain */
	return ldb_next_request(module, down_req);
}


/*
  handle a rename request

  On a rename we need to do an extra ldb_modify which sets the
  whenChanged and uSNChanged attributes
 */
static int replmd_rename(struct ldb_module *module, struct ldb_request *req)
{
	struct ldb_context *ldb;
	int ret, i;
	time_t t = time(NULL);
	uint64_t seq_num = 0;
	struct ldb_message *msg;
	struct replmd_private *replmd_private = 
		talloc_get_type(ldb_module_get_private(module), struct replmd_private);

	/* do not manipulate our control entries */
	if (ldb_dn_is_special(req->op.mod.message->dn)) {
		return ldb_next_request(module, req);
	}

	ldb = ldb_module_get_ctx(module);

	ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_rename\n");

	/* Get a sequence number from the backend */
	ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
	if (ret != LDB_SUCCESS) {
		return ret;
	}

	msg = ldb_msg_new(req);
	if (msg == NULL) {
		ldb_oom(ldb);
		return LDB_ERR_OPERATIONS_ERROR;
	}

	msg->dn = req->op.rename.olddn;

	if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
		talloc_free(msg);
		return LDB_ERR_OPERATIONS_ERROR;
	}
	msg->elements[0].flags = LDB_FLAG_MOD_REPLACE;

	if (add_uint64_element(msg, "uSNChanged", seq_num) != LDB_SUCCESS) {
		talloc_free(msg);
		return LDB_ERR_OPERATIONS_ERROR;
	}
	msg->elements[1].flags = LDB_FLAG_MOD_REPLACE;

	ret = ldb_modify(ldb, msg);
	talloc_free(msg);
	if (ret != LDB_SUCCESS) {
		return ret;
	}

	ret = replmd_load_NCs(module);
	if (ret != 0) {
		return ret;
	}

	/* now update the highest uSNs of the partitions that are
	   affected. Note that two partitions could be changing */
	for (i=0; i<replmd_private->num_ncs; i++) {
		if (ldb_dn_compare_base(replmd_private->ncs[i].dn, 
					req->op.rename.olddn) == 0) {
			break;
		}
	}
	if (i == replmd_private->num_ncs) {
		DEBUG(0,(__location__ ": rename olddn outside tree? %s\n",
			 ldb_dn_get_linearized(req->op.rename.olddn)));
		return LDB_ERR_OPERATIONS_ERROR;
	}
	replmd_private->ncs[i].mod_usn = seq_num;

	for (i=0; i<replmd_private->num_ncs; i++) {
		if (ldb_dn_compare_base(replmd_private->ncs[i].dn, 
					req->op.rename.newdn) == 0) {
			break;
		}
	}
	if (i == replmd_private->num_ncs) {
		DEBUG(0,(__location__ ": rename newdn outside tree? %s\n",
			 ldb_dn_get_linearized(req->op.rename.newdn)));
		return LDB_ERR_OPERATIONS_ERROR;
	}
	replmd_private->ncs[i].mod_usn = seq_num;
	
	/* go on with the call chain */
	return ldb_next_request(module, req);
}


static int replmd_replicated_request_error(struct replmd_replicated_request *ar, int ret)
{
	return ret;
}

static int replmd_replicated_request_werror(struct replmd_replicated_request *ar, WERROR status)
{
	int ret = LDB_ERR_OTHER;
	/* TODO: do some error mapping */
	return ret;
}

static int replmd_replicated_apply_next(struct replmd_replicated_request *ar);

static int replmd_replicated_apply_add_callback(struct ldb_request *req,
						struct ldb_reply *ares)
{
	struct ldb_context *ldb;
	struct replmd_replicated_request *ar = talloc_get_type(req->context,
					       struct replmd_replicated_request);
	int ret;

	ldb = ldb_module_get_ctx(ar->module);

	if (!ares) {
		return ldb_module_done(ar->req, NULL, NULL,
					LDB_ERR_OPERATIONS_ERROR);
	}
	if (ares->error != LDB_SUCCESS) {
		return ldb_module_done(ar->req, ares->controls,
					ares->response, ares->error);
	}

	if (ares->type != LDB_REPLY_DONE) {
		ldb_set_errstring(ldb, "Invalid reply type\n!");
		return ldb_module_done(ar->req, NULL, NULL,
					LDB_ERR_OPERATIONS_ERROR);
	}

	talloc_free(ares);
	ar->index_current++;

	ret = replmd_replicated_apply_next(ar);
	if (ret != LDB_SUCCESS) {
		return ldb_module_done(ar->req, NULL, NULL, ret);
	}

	return LDB_SUCCESS;
}

static int replmd_replicated_apply_add(struct replmd_replicated_request *ar)
{
	struct ldb_context *ldb;
	struct ldb_request *change_req;
	enum ndr_err_code ndr_err;
	struct ldb_message *msg;
	struct replPropertyMetaDataBlob *md;
	struct ldb_val md_value;
	uint32_t i;
	uint64_t seq_num;
	int ret;

	/*
	 * TODO: check if the parent object exist
	 */

	/*
	 * TODO: handle the conflict case where an object with the
	 *       same name exist
	 */

	ldb = ldb_module_get_ctx(ar->module);
	msg = ar->objs->objects[ar->index_current].msg;
	md = ar->objs->objects[ar->index_current].meta_data;

	ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
	if (ret != LDB_SUCCESS) {
		return replmd_replicated_request_error(ar, ret);
	}

	ret = ldb_msg_add_value(msg, "objectGUID", &ar->objs->objects[ar->index_current].guid_value, NULL);
	if (ret != LDB_SUCCESS) {
		return replmd_replicated_request_error(ar, ret);
	}

	ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
	if (ret != LDB_SUCCESS) {
		return replmd_replicated_request_error(ar, ret);
	}

	ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", seq_num);
	if (ret != LDB_SUCCESS) {
		return replmd_replicated_request_error(ar, ret);
	}

	ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", seq_num);
	if (ret != LDB_SUCCESS) {
		return replmd_replicated_request_error(ar, ret);
	}

	ret = replmd_notify(ar->module, msg->dn, seq_num);
	if (ret != LDB_SUCCESS) {
		return replmd_replicated_request_error(ar, ret);
	}

	/* remove any message elements that have zero values */
	for (i=0; i<msg->num_elements; i++) {
		if (msg->elements[i].num_values == 0) {
			DEBUG(4,(__location__ ": Removing attribute %s with num_values==0\n",
				 msg->elements[i].name));
			memmove(&msg->elements[i], 
				&msg->elements[i+1], 
				sizeof(msg->elements[i])*(msg->num_elements - (i+1)));
			msg->num_elements--;
			i--;
		}
	}
	
	/*
	 * the meta data array is already sorted by the caller
	 */
	for (i=0; i < md->ctr.ctr1.count; i++) {
		md->ctr.ctr1.array[i].local_usn = seq_num;
	}
	ndr_err = ndr_push_struct_blob(&md_value, msg, 
				       lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
				       md,
				       (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
		NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
		return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
	}
	ret = ldb_msg_add_value(msg, "replPropertyMetaData", &md_value, NULL);
	if (ret != LDB_SUCCESS) {
		return replmd_replicated_request_error(ar, ret);
	}

	replmd_ldb_message_sort(msg, ar->schema);

	if (DEBUGLVL(4)) {
		char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_ADD, msg);
		DEBUG(4, ("DRS replication add message:\n%s\n", s));
		talloc_free(s);
	}

	ret = ldb_build_add_req(&change_req,
				ldb,
				ar,
				msg,
				ar->controls,
				ar,
				replmd_replicated_apply_add_callback,
				ar->req);
	if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);

	return ldb_next_request(ar->module, change_req);
}

static int replmd_replPropertyMetaData1_conflict_compare(struct replPropertyMetaData1 *m1,
							 struct replPropertyMetaData1 *m2)
{
	int ret;

	if (m1->version != m2->version) {
		return m1->version - m2->version;
	}

	if (m1->originating_change_time != m2->originating_change_time) {
		return m1->originating_change_time - m2->originating_change_time;
	}

	ret = GUID_compare(&m1->originating_invocation_id, &m2->originating_invocation_id);
	if (ret != 0) {
		return ret;
	}

	return m1->originating_usn - m2->originating_usn;
}

static int replmd_replicated_apply_merge_callback(struct ldb_request *req,
						  struct ldb_reply *ares)
{
	struct ldb_context *ldb;
	struct replmd_replicated_request *ar = talloc_get_type(req->context,
					       struct replmd_replicated_request);
	int ret;

	ldb = ldb_module_get_ctx(ar->module);

	if (!ares) {
		return ldb_module_done(ar->req, NULL, NULL,
					LDB_ERR_OPERATIONS_ERROR);
	}
	if (ares->error != LDB_SUCCESS) {
		return ldb_module_done(ar->req, ares->controls,
					ares->response, ares->error);
	}

	if (ares->type != LDB_REPLY_DONE) {
		ldb_set_errstring(ldb, "Invalid reply type\n!");
		return ldb_module_done(ar->req, NULL, NULL,
					LDB_ERR_OPERATIONS_ERROR);
	}

	talloc_free(ares);
	ar->index_current++;

	ret = replmd_replicated_apply_next(ar);
	if (ret != LDB_SUCCESS) {
		return ldb_module_done(ar->req, NULL, NULL, ret);
	}

	return LDB_SUCCESS;
}

static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
{
	struct ldb_context *ldb;
	struct ldb_request *change_req;
	enum ndr_err_code ndr_err;
	struct ldb_message *msg;
	struct replPropertyMetaDataBlob *rmd;
	struct replPropertyMetaDataBlob omd;
	const struct ldb_val *omd_value;
	struct replPropertyMetaDataBlob nmd;
	struct ldb_val nmd_value;
	uint32_t i,j,ni=0;
	uint32_t removed_attrs = 0;
	uint64_t seq_num;
	int ret;

	ldb = ldb_module_get_ctx(ar->module);
	msg = ar->objs->objects[ar->index_current].msg;
	rmd = ar->objs->objects[ar->index_current].meta_data;
	ZERO_STRUCT(omd);
	omd.version = 1;

	/*
	 * TODO: check repl data is correct after a rename
	 */
	if (ldb_dn_compare(msg->dn, ar->search_msg->dn) != 0) {
		ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_request rename %s => %s\n",
			  ldb_dn_get_linearized(ar->search_msg->dn),
			  ldb_dn_get_linearized(msg->dn));
		if (ldb_rename(ldb, ar->search_msg->dn, msg->dn) != LDB_SUCCESS) {
			ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_replicated_request rename %s => %s failed - %s\n",
				  ldb_dn_get_linearized(ar->search_msg->dn),
				  ldb_dn_get_linearized(msg->dn),
				  ldb_errstring(ldb));
			return replmd_replicated_request_werror(ar, WERR_DS_DRA_DB_ERROR);
		}
	}

	/* find existing meta data */
	omd_value = ldb_msg_find_ldb_val(ar->search_msg, "replPropertyMetaData");
	if (omd_value) {
		ndr_err = ndr_pull_struct_blob(omd_value, ar,
					       lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &omd,
					       (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
		if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
			NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
			return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
		}

		if (omd.version != 1) {
			return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
		}
	}

	ZERO_STRUCT(nmd);
	nmd.version = 1;
	nmd.ctr.ctr1.count = omd.ctr.ctr1.count + rmd->ctr.ctr1.count;
	nmd.ctr.ctr1.array = talloc_array(ar,
					  struct replPropertyMetaData1,
					  nmd.ctr.ctr1.count);
	if (!nmd.ctr.ctr1.array) return replmd_replicated_request_werror(ar, WERR_NOMEM);

	/* first copy the old meta data */
	for (i=0; i < omd.ctr.ctr1.count; i++) {
		nmd.ctr.ctr1.array[ni]	= omd.ctr.ctr1.array[i];
		ni++;
	}

	/* now merge in the new meta data */
	for (i=0; i < rmd->ctr.ctr1.count; i++) {
		bool found = false;

		for (j=0; j < ni; j++) {
			int cmp;

			if (rmd->ctr.ctr1.array[i].attid != nmd.ctr.ctr1.array[j].attid) {
				continue;
			}

			cmp = replmd_replPropertyMetaData1_conflict_compare(&rmd->ctr.ctr1.array[i],
									    &nmd.ctr.ctr1.array[j]);
			if (cmp > 0) {
				/* replace the entry */
				nmd.ctr.ctr1.array[j] = rmd->ctr.ctr1.array[i];
				found = true;
				break;
			}

			/* we don't want to apply this change so remove the attribute */
			ldb_msg_remove_element(msg, &msg->elements[i-removed_attrs]);
			removed_attrs++;

			found = true;
			break;
		}

		if (found) continue;

		nmd.ctr.ctr1.array[ni] = rmd->ctr.ctr1.array[i];
		ni++;
	}

	/*
	 * finally correct the size of the meta_data array
	 */
	nmd.ctr.ctr1.count = ni;

	/*
	 * the rdn attribute (the alias for the name attribute),
	 * 'cn' for most objects is the last entry in the meta data array
	 * we have stored
	 *
	 * sort the new meta data array
	 */
	{
		struct replPropertyMetaData1 *rdn_p;
		uint32_t rdn_idx = omd.ctr.ctr1.count - 1;

		rdn_p = &nmd.ctr.ctr1.array[rdn_idx];
		replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, &rdn_p->attid);
	}

	/*
	 * check if some replicated attributes left, otherwise skip the ldb_modify() call
	 */
	if (msg->num_elements == 0) {
		ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: skip replace\n",
			  ar->index_current);

		ar->index_current++;
		return replmd_replicated_apply_next(ar);
	}

	ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: replace %u attributes\n",
		  ar->index_current, msg->num_elements);

	ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
	if (ret != LDB_SUCCESS) {
		return replmd_replicated_request_error(ar, ret);
	}

	for (i=0; i<ni; i++) {
		nmd.ctr.ctr1.array[i].local_usn = seq_num;
	}

	/* create the meta data value */
	ndr_err = ndr_push_struct_blob(&nmd_value, msg, 
				       lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
				       &nmd,
				       (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
		NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
		return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
	}

	/*
	 * when we know that we'll modify the record, add the whenChanged, uSNChanged
	 * and replPopertyMetaData attributes
	 */
	ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
	if (ret != LDB_SUCCESS) {
		return replmd_replicated_request_error(ar, ret);
	}
	ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", seq_num);
	if (ret != LDB_SUCCESS) {
		return replmd_replicated_request_error(ar, ret);
	}
	ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
	if (ret != LDB_SUCCESS) {
		return replmd_replicated_request_error(ar, ret);
	}

	replmd_ldb_message_sort(msg, ar->schema);

	/* we want to replace the old values */
	for (i=0; i < msg->num_elements; i++) {
		msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
	}

	ret = replmd_notify(ar->module, msg->dn, seq_num);
	if (ret != LDB_SUCCESS) {
		return replmd_replicated_request_error(ar, ret);
	}

	if (DEBUGLVL(4)) {
		char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
		DEBUG(4, ("DRS replication modify message:\n%s\n", s));
		talloc_free(s);
	}

	ret = ldb_build_mod_req(&change_req,
				ldb,
				ar,
				msg,
				ar->controls,
				ar,
				replmd_replicated_apply_merge_callback,
				ar->req);
	if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);

	return ldb_next_request(ar->module, change_req);
}

static int replmd_replicated_apply_search_callback(struct ldb_request *req,
						   struct ldb_reply *ares)
{
	struct replmd_replicated_request *ar = talloc_get_type(req->context,
					       struct replmd_replicated_request);
	int ret;

	if (!ares) {
		return ldb_module_done(ar->req, NULL, NULL,
					LDB_ERR_OPERATIONS_ERROR);
	}
	if (ares->error != LDB_SUCCESS &&
	    ares->error != LDB_ERR_NO_SUCH_OBJECT) {
		return ldb_module_done(ar->req, ares->controls,
					ares->response, ares->error);
	}

	switch (ares->type) {
	case LDB_REPLY_ENTRY:
		ar->search_msg = talloc_steal(ar, ares->message);
		break;

	case LDB_REPLY_REFERRAL:
		/* we ignore referrals */
		break;

	case LDB_REPLY_DONE:
		if (ar->search_msg != NULL) {
			ret = replmd_replicated_apply_merge(ar);
		} else {
			ret = replmd_replicated_apply_add(ar);
		}
		if (ret != LDB_SUCCESS) {
			return ldb_module_done(ar->req, NULL, NULL, ret);
		}
	}

	talloc_free(ares);
	return LDB_SUCCESS;
}

static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar);

static int replmd_replicated_apply_next(struct replmd_replicated_request *ar)
{
	struct ldb_context *ldb;
	int ret;
	char *tmp_str;
	char *filter;
	struct ldb_request *search_req;

	if (ar->index_current >= ar->objs->num_objects) {
		/* done with it, go to next stage */
		return replmd_replicated_uptodate_vector(ar);
	}

	ldb = ldb_module_get_ctx(ar->module);
	ar->search_msg = NULL;

	tmp_str = ldb_binary_encode(ar, ar->objs->objects[ar->index_current].guid_value);
	if (!tmp_str) return replmd_replicated_request_werror(ar, WERR_NOMEM);

	filter = talloc_asprintf(ar, "(objectGUID=%s)", tmp_str);
	if (!filter) return replmd_replicated_request_werror(ar, WERR_NOMEM);
	talloc_free(tmp_str);

	ret = ldb_build_search_req(&search_req,
				   ldb,
				   ar,
				   ar->objs->partition_dn,
				   LDB_SCOPE_SUBTREE,
				   filter,
				   NULL,
				   NULL,
				   ar,
				   replmd_replicated_apply_search_callback,
				   ar->req);
	if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);

	return ldb_next_request(ar->module, search_req);
}

static int replmd_replicated_uptodate_modify_callback(struct ldb_request *req,
						      struct ldb_reply *ares)
{
	struct ldb_context *ldb;
	struct replmd_replicated_request *ar = talloc_get_type(req->context,
					       struct replmd_replicated_request);
	ldb = ldb_module_get_ctx(ar->module);

	if (!ares) {
		return ldb_module_done(ar->req, NULL, NULL,
					LDB_ERR_OPERATIONS_ERROR);
	}
	if (ares->error != LDB_SUCCESS) {
		return ldb_module_done(ar->req, ares->controls,
					ares->response, ares->error);
	}

	if (ares->type != LDB_REPLY_DONE) {
		ldb_set_errstring(ldb, "Invalid reply type\n!");
		return ldb_module_done(ar->req, NULL, NULL,
					LDB_ERR_OPERATIONS_ERROR);
	}

	talloc_free(ares);

	return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
}

static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *ar)
{
	struct ldb_context *ldb;
	struct ldb_request *change_req;
	enum ndr_err_code ndr_err;
	struct ldb_message *msg;
	struct replUpToDateVectorBlob ouv;
	const struct ldb_val *ouv_value;
	const struct drsuapi_DsReplicaCursor2CtrEx *ruv;
	struct replUpToDateVectorBlob nuv;
	struct ldb_val nuv_value;
	struct ldb_message_element *nuv_el = NULL;
	const struct GUID *our_invocation_id;
	struct ldb_message_element *orf_el = NULL;
	struct repsFromToBlob nrf;
	struct ldb_val *nrf_value = NULL;
	struct ldb_message_element *nrf_el = NULL;
	uint32_t i,j,ni=0;
	bool found = false;
	time_t t = time(NULL);
	NTTIME now;
	int ret;

	ldb = ldb_module_get_ctx(ar->module);
	ruv = ar->objs->uptodateness_vector;
	ZERO_STRUCT(ouv);
	ouv.version = 2;
	ZERO_STRUCT(nuv);
	nuv.version = 2;

	unix_to_nt_time(&now, t);

	/*
	 * first create the new replUpToDateVector
	 */
	ouv_value = ldb_msg_find_ldb_val(ar->search_msg, "replUpToDateVector");
	if (ouv_value) {
		ndr_err = ndr_pull_struct_blob(ouv_value, ar,
					       lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &ouv,
					       (ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob);
		if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
			NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
			return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
		}

		if (ouv.version != 2) {
			return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
		}
	}

	/*
	 * the new uptodateness vector will at least
	 * contain 1 entry, one for the source_dsa
	 *
	 * plus optional values from our old vector and the one from the source_dsa
	 */
	nuv.ctr.ctr2.count = 1 + ouv.ctr.ctr2.count;
	if (ruv) nuv.ctr.ctr2.count += ruv->count;
	nuv.ctr.ctr2.cursors = talloc_array(ar,
					    struct drsuapi_DsReplicaCursor2,
					    nuv.ctr.ctr2.count);
	if (!nuv.ctr.ctr2.cursors) return replmd_replicated_request_werror(ar, WERR_NOMEM);

	/* first copy the old vector */
	for (i=0; i < ouv.ctr.ctr2.count; i++) {
		nuv.ctr.ctr2.cursors[ni] = ouv.ctr.ctr2.cursors[i];
		ni++;
	}

	/* get our invocation_id if we have one already attached to the ldb */
	our_invocation_id = samdb_ntds_invocation_id(ldb);

	/* merge in the source_dsa vector is available */
	for (i=0; (ruv && i < ruv->count); i++) {
		found = false;

		if (our_invocation_id &&
		    GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
			       our_invocation_id)) {
			continue;
		}

		for (j=0; j < ni; j++) {
			if (!GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
					&nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
				continue;
			}

			found = true;

			/*
			 * we update only the highest_usn and not the latest_sync_success time,
			 * because the last success stands for direct replication
			 */
			if (ruv->cursors[i].highest_usn > nuv.ctr.ctr2.cursors[j].highest_usn) {
				nuv.ctr.ctr2.cursors[j].highest_usn = ruv->cursors[i].highest_usn;
			}
			break;			
		}

		if (found) continue;

		/* if it's not there yet, add it */
		nuv.ctr.ctr2.cursors[ni] = ruv->cursors[i];
		ni++;
	}

	/*
	 * merge in the current highwatermark for the source_dsa
	 */
	found = false;
	for (j=0; j < ni; j++) {
		if (!GUID_equal(&ar->objs->source_dsa->source_dsa_invocation_id,
				&nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
			continue;
		}

		found = true;

		/*
		 * here we update the highest_usn and last_sync_success time
		 * because we're directly replicating from the source_dsa
		 *
		 * and use the tmp_highest_usn because this is what we have just applied
		 * to our ldb
		 */
		nuv.ctr.ctr2.cursors[j].highest_usn		= ar->objs->source_dsa->highwatermark.tmp_highest_usn;
		nuv.ctr.ctr2.cursors[j].last_sync_success	= now;
		break;
	}
	if (!found) {
		/*
		 * here we update the highest_usn and last_sync_success time
		 * because we're directly replicating from the source_dsa
		 *
		 * and use the tmp_highest_usn because this is what we have just applied
		 * to our ldb
		 */
		nuv.ctr.ctr2.cursors[ni].source_dsa_invocation_id= ar->objs->source_dsa->source_dsa_invocation_id;
		nuv.ctr.ctr2.cursors[ni].highest_usn		= ar->objs->source_dsa->highwatermark.tmp_highest_usn;
		nuv.ctr.ctr2.cursors[ni].last_sync_success	= now;
		ni++;
	}

	/*
	 * finally correct the size of the cursors array
	 */
	nuv.ctr.ctr2.count = ni;

	/*
	 * sort the cursors
	 */
	qsort(nuv.ctr.ctr2.cursors, nuv.ctr.ctr2.count,
	      sizeof(struct drsuapi_DsReplicaCursor2),
	      (comparison_fn_t)drsuapi_DsReplicaCursor2_compare);

	/*
	 * create the change ldb_message
	 */
	msg = ldb_msg_new(ar);
	if (!msg) return replmd_replicated_request_werror(ar, WERR_NOMEM);
	msg->dn = ar->search_msg->dn;

	ndr_err = ndr_push_struct_blob(&nuv_value, msg, 
				       lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), 
				       &nuv,
				       (ndr_push_flags_fn_t)ndr_push_replUpToDateVectorBlob);
	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
		NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
		return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
	}
	ret = ldb_msg_add_value(msg, "replUpToDateVector", &nuv_value, &nuv_el);
	if (ret != LDB_SUCCESS) {
		return replmd_replicated_request_error(ar, ret);
	}
	nuv_el->flags = LDB_FLAG_MOD_REPLACE;

	/*
	 * now create the new repsFrom value from the given repsFromTo1 structure
	 */
	ZERO_STRUCT(nrf);
	nrf.version					= 1;
	nrf.ctr.ctr1					= *ar->objs->source_dsa;
	/* and fix some values... */
	nrf.ctr.ctr1.consecutive_sync_failures		= 0;
	nrf.ctr.ctr1.last_success			= now;
	nrf.ctr.ctr1.last_attempt			= now;
	nrf.ctr.ctr1.result_last_attempt		= WERR_OK;
	nrf.ctr.ctr1.highwatermark.highest_usn		= nrf.ctr.ctr1.highwatermark.tmp_highest_usn;

	/*
	 * first see if we already have a repsFrom value for the current source dsa
	 * if so we'll later replace this value
	 */
	orf_el = ldb_msg_find_element(ar->search_msg, "repsFrom");
	if (orf_el) {
		for (i=0; i < orf_el->num_values; i++) {
			struct repsFromToBlob *trf;

			trf = talloc(ar, struct repsFromToBlob);
			if (!trf) return replmd_replicated_request_werror(ar, WERR_NOMEM);

			ndr_err = ndr_pull_struct_blob(&orf_el->values[i], trf, lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), trf,
						       (ndr_pull_flags_fn_t)ndr_pull_repsFromToBlob);
			if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
				NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
				return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
			}

			if (trf->version != 1) {
				return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
			}

			/*
			 * we compare the source dsa objectGUID not the invocation_id
			 * because we want only one repsFrom value per source dsa
			 * and when the invocation_id of the source dsa has changed we don't need 
			 * the old repsFrom with the old invocation_id
			 */
			if (!GUID_equal(&trf->ctr.ctr1.source_dsa_obj_guid,
					&ar->objs->source_dsa->source_dsa_obj_guid)) {
				talloc_free(trf);
				continue;
			}

			talloc_free(trf);
			nrf_value = &orf_el->values[i];
			break;
		}

		/*
		 * copy over all old values to the new ldb_message
		 */
		ret = ldb_msg_add_empty(msg, "repsFrom", 0, &nrf_el);
		if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
		*nrf_el = *orf_el;
	}

	/*
	 * if we haven't found an old repsFrom value for the current source dsa
	 * we'll add a new value
	 */
	if (!nrf_value) {
		struct ldb_val zero_value;
		ZERO_STRUCT(zero_value);
		ret = ldb_msg_add_value(msg, "repsFrom", &zero_value, &nrf_el);
		if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);

		nrf_value = &nrf_el->values[nrf_el->num_values - 1];
	}

	/* we now fill the value which is already attached to ldb_message */
	ndr_err = ndr_push_struct_blob(nrf_value, msg, 
				       lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
				       &nrf,
				       (ndr_push_flags_fn_t)ndr_push_repsFromToBlob);
	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
		NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
		return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
	}

	/* 
	 * the ldb_message_element for the attribute, has all the old values and the new one
	 * so we'll replace the whole attribute with all values
	 */
	nrf_el->flags = LDB_FLAG_MOD_REPLACE;

	if (DEBUGLVL(4)) {
		char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
		DEBUG(4, ("DRS replication uptodate modify message:\n%s\n", s));
		talloc_free(s);
	}

	/* prepare the ldb_modify() request */
	ret = ldb_build_mod_req(&change_req,
				ldb,
				ar,
				msg,
				ar->controls,
				ar,
				replmd_replicated_uptodate_modify_callback,
				ar->req);
	if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);

	return ldb_next_request(ar->module, change_req);
}

static int replmd_replicated_uptodate_search_callback(struct ldb_request *req,
						      struct ldb_reply *ares)
{
	struct replmd_replicated_request *ar = talloc_get_type(req->context,
					       struct replmd_replicated_request);
	int ret;

	if (!ares) {
		return ldb_module_done(ar->req, NULL, NULL,
					LDB_ERR_OPERATIONS_ERROR);
	}
	if (ares->error != LDB_SUCCESS &&
	    ares->error != LDB_ERR_NO_SUCH_OBJECT) {
		return ldb_module_done(ar->req, ares->controls,
					ares->response, ares->error);
	}

	switch (ares->type) {
	case LDB_REPLY_ENTRY:
		ar->search_msg = talloc_steal(ar, ares->message);
		break;

	case LDB_REPLY_REFERRAL:
		/* we ignore referrals */
		break;

	case LDB_REPLY_DONE:
		if (ar->search_msg == NULL) {
			ret = replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
		} else {
			ret = replmd_replicated_uptodate_modify(ar);
		}
		if (ret != LDB_SUCCESS) {
			return ldb_module_done(ar->req, NULL, NULL, ret);
		}
	}

	talloc_free(ares);
	return LDB_SUCCESS;
}


static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar)
{
	struct ldb_context *ldb;
	int ret;
	static const char *attrs[] = {
		"replUpToDateVector",
		"repsFrom",
		NULL
	};
	struct ldb_request *search_req;

	ldb = ldb_module_get_ctx(ar->module);
	ar->search_msg = NULL;

	ret = ldb_build_search_req(&search_req,
				   ldb,
				   ar,
				   ar->objs->partition_dn,
				   LDB_SCOPE_BASE,
				   "(objectClass=*)",
				   attrs,
				   NULL,
				   ar,
				   replmd_replicated_uptodate_search_callback,
				   ar->req);
	if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);

	return ldb_next_request(ar->module, search_req);
}



static int replmd_extended_replicated_objects(struct ldb_module *module, struct ldb_request *req)
{
	struct ldb_context *ldb;
	struct dsdb_extended_replicated_objects *objs;
	struct replmd_replicated_request *ar;
	struct ldb_control **ctrls;
	int ret, i;
	struct dsdb_control_current_partition *partition_ctrl;
	struct replmd_private *replmd_private = 
		talloc_get_type(ldb_module_get_private(module), struct replmd_private);

	ldb = ldb_module_get_ctx(module);

	ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_extended_replicated_objects\n");

	objs = talloc_get_type(req->op.extended.data, struct dsdb_extended_replicated_objects);
	if (!objs) {
		ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: invalid extended data\n");
		return LDB_ERR_PROTOCOL_ERROR;
	}

	if (objs->version != DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION) {
		ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: extended data invalid version [%u != %u]\n",
			  objs->version, DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION);
		return LDB_ERR_PROTOCOL_ERROR;
	}

	ar = replmd_ctx_init(module, req);
	if (!ar)
		return LDB_ERR_OPERATIONS_ERROR;

	ar->objs = objs;
	ar->schema = dsdb_get_schema(ldb);
	if (!ar->schema) {
		ldb_debug_set(ldb, LDB_DEBUG_FATAL, "replmd_ctx_init: no loaded schema found\n");
		talloc_free(ar);
		DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
		return LDB_ERR_CONSTRAINT_VIOLATION;
	}

	ctrls = req->controls;

	if (req->controls) {
		req->controls = talloc_memdup(ar, req->controls,
					      talloc_get_size(req->controls));
		if (!req->controls) return replmd_replicated_request_werror(ar, WERR_NOMEM);
	}

	ret = ldb_request_add_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID, false, NULL);
	if (ret != LDB_SUCCESS) {
		return ret;
	}

	/*
	  add the DSDB_CONTROL_CURRENT_PARTITION_OID control. This
	  tells the partition module which partition this request is
	  directed at. That is important as the partition roots appear
	  twice in the directory, once as mount points in the top
	  level store, and once as the roots of each partition. The
	  replication code wants to operate on the root of the
	  partitions, not the top level mount points
	 */
	partition_ctrl = talloc(req, struct dsdb_control_current_partition);
	if (partition_ctrl == NULL) {
		if (!partition_ctrl) return replmd_replicated_request_werror(ar, WERR_NOMEM);
	}
	partition_ctrl->version = DSDB_CONTROL_CURRENT_PARTITION_VERSION;
	partition_ctrl->dn = objs->partition_dn;

	ret = ldb_request_add_control(req, DSDB_CONTROL_CURRENT_PARTITION_OID, false, partition_ctrl);
	if (ret != LDB_SUCCESS) {
		return ret;
	}

	ar->controls = req->controls;
	req->controls = ctrls;

	DEBUG(4,("linked_attributes_count=%u\n", objs->linked_attributes_count));

	/* save away the linked attributes for the end of the
	   transaction */
	for (i=0; i<ar->objs->linked_attributes_count; i++) {
		struct la_entry *la_entry;

		if (replmd_private->la_ctx == NULL) {
			replmd_private->la_ctx = talloc_new(replmd_private);
		}
		la_entry = talloc(replmd_private->la_ctx, struct la_entry);
		if (la_entry == NULL) {
			ldb_oom(ldb);
			return LDB_ERR_OPERATIONS_ERROR;
		}
		la_entry->la = talloc(la_entry, struct drsuapi_DsReplicaLinkedAttribute);
		if (la_entry->la == NULL) {
			talloc_free(la_entry);
			ldb_oom(ldb);
			return LDB_ERR_OPERATIONS_ERROR;
		}
		*la_entry->la = ar->objs->linked_attributes[i];

		/* we need to steal the non-scalars so they stay
		   around until the end of the transaction */
		talloc_steal(la_entry->la, la_entry->la->identifier);
		talloc_steal(la_entry->la, la_entry->la->value.blob);

		DLIST_ADD(replmd_private->la_list, la_entry);
	}

	return replmd_replicated_apply_next(ar);
}

/*
  process one linked attribute structure
 */
static int replmd_process_linked_attribute(struct ldb_module *module,
					   struct la_entry *la_entry)
{					   
	struct drsuapi_DsReplicaLinkedAttribute *la = la_entry->la;
	struct ldb_context *ldb = ldb_module_get_ctx(module);
	struct drsuapi_DsReplicaObjectIdentifier3 target;
	struct ldb_message *msg;
	struct ldb_message_element *ret_el;
	TALLOC_CTX *tmp_ctx = talloc_new(la_entry);
	enum ndr_err_code ndr_err;
	char *target_dn;
	struct ldb_request *mod_req;
	int ret;
	const struct dsdb_attribute *attr;

/*
linked_attributes[0]:                                                     
     &objs->linked_attributes[i]: struct drsuapi_DsReplicaLinkedAttribute 
        identifier               : *                                      
            identifier: struct drsuapi_DsReplicaObjectIdentifier          
                __ndr_size               : 0x0000003a (58)                
                __ndr_size_sid           : 0x00000000 (0)                 
                guid                     : 8e95b6a9-13dd-4158-89db-3220a5be5cc7
                sid                      : S-0-0                               
                __ndr_size_dn            : 0x00000000 (0)                      
                dn                       : ''                                  
        attid                    : DRSUAPI_ATTRIBUTE_member (0x1F)             
        value: struct drsuapi_DsAttributeValue                                 
            __ndr_size               : 0x0000007e (126)                        
            blob                     : *                                       
                blob                     : DATA_BLOB length=126                
        flags                    : 0x00000001 (1)                              
               1: DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE                      
        originating_add_time     : Wed Sep  2 22:20:01 2009 EST                
        meta_data: struct drsuapi_DsReplicaMetaData                            
            version                  : 0x00000015 (21)                         
            originating_change_time  : Wed Sep  2 23:39:07 2009 EST            
            originating_invocation_id: 794640f3-18cf-40ee-a211-a93992b67a64    
            originating_usn          : 0x000000000001e19c (123292)             
     &target: struct drsuapi_DsReplicaObjectIdentifier3                        
        __ndr_size               : 0x0000007e (126)                            
        __ndr_size_sid           : 0x0000001c (28)                             
        guid                     : 7639e594-db75-4086-b0d4-67890ae46031        
        sid                      : S-1-5-21-2848215498-2472035911-1947525656-19924
        __ndr_size_dn            : 0x00000022 (34)                                
        dn                       : 'CN=UOne,OU=TestOU,DC=vsofs8,DC=com'           
 */
	if (DEBUGLVL(4)) {
		NDR_PRINT_DEBUG(drsuapi_DsReplicaLinkedAttribute, la); 
	}
	
	/* decode the target of the link */
	ndr_err = ndr_pull_struct_blob(la->value.blob, 
				       tmp_ctx, lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), 
				       &target,
				       (ndr_pull_flags_fn_t)ndr_pull_drsuapi_DsReplicaObjectIdentifier3);
	if (ndr_err != NDR_ERR_SUCCESS) {
		DEBUG(0,("Unable to decode linked_attribute target\n"));
		dump_data(4, la->value.blob->data, la->value.blob->length);			
		talloc_free(tmp_ctx);
		return LDB_ERR_OPERATIONS_ERROR;
	}
	if (DEBUGLVL(4)) {
		NDR_PRINT_DEBUG(drsuapi_DsReplicaObjectIdentifier3, &target);
	}

	/* construct a modify request for this attribute change */
	msg = ldb_msg_new(tmp_ctx);
	if (!msg) {
		ldb_oom(ldb);
		talloc_free(tmp_ctx);
		return LDB_ERR_OPERATIONS_ERROR;
	}

	ret = dsdb_find_dn_by_guid(ldb, tmp_ctx, 
				   GUID_string(tmp_ctx, &la->identifier->guid), &msg->dn);
	if (ret != LDB_SUCCESS) {
		talloc_free(tmp_ctx);
		return ret;
	}

	/* find the attribute being modified */
	attr = dsdb_attribute_by_attributeID_id(dsdb_get_schema(ldb), la->attid);
	if (attr == NULL) {
		DEBUG(0, (__location__ ": Unable to find attributeID 0x%x\n", la->attid));
		talloc_free(tmp_ctx);
		return LDB_ERR_OPERATIONS_ERROR;
	}

	if (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE) {
		ret = ldb_msg_add_empty(msg, attr->lDAPDisplayName,
					LDB_FLAG_MOD_ADD, &ret_el);
	} else {
		ret = ldb_msg_add_empty(msg, attr->lDAPDisplayName,
					LDB_FLAG_MOD_DELETE, &ret_el);
	}
	if (ret != LDB_SUCCESS) {
		talloc_free(tmp_ctx);
		return ret;
	}
	/* we allocate two entries here, in case we need a remove/add
	   pair */
	ret_el->values = talloc_array(msg, struct ldb_val, 2);
	if (!ret_el->values) {
		ldb_oom(ldb);
		talloc_free(tmp_ctx);
		return LDB_ERR_OPERATIONS_ERROR;
	}
	ret_el->num_values = 1;

	target_dn = talloc_asprintf(tmp_ctx, "<GUID=%s>;<SID=%s>;%s",
				    GUID_string(tmp_ctx, &target.guid),
				    dom_sid_string(tmp_ctx, &target.sid),
				    target.dn);
	if (target_dn == NULL) {
		ldb_oom(ldb);
		talloc_free(tmp_ctx);
		return LDB_ERR_OPERATIONS_ERROR;
	}
	ret_el->values[0] = data_blob_string_const(target_dn);

	ret = ldb_build_mod_req(&mod_req, ldb, tmp_ctx,
				msg,
				NULL,
				NULL, 
				ldb_op_default_callback,
				NULL);
	if (ret != LDB_SUCCESS) {
		talloc_free(tmp_ctx);
		return ret;
	}
	talloc_steal(mod_req, msg);

	if (DEBUGLVL(4)) {
		DEBUG(4,("Applying DRS linked attribute change:\n%s\n",
			 ldb_ldif_message_string(ldb, tmp_ctx, LDB_CHANGETYPE_MODIFY, msg)));
	}

	/* Run the new request */
	ret = ldb_next_request(module, mod_req);

	/* we need to wait for this to finish, as we are being called
	   from the synchronous end_transaction hook of this module */
	if (ret == LDB_SUCCESS) {
		ret = ldb_wait(mod_req->handle, LDB_WAIT_ALL);
	}

	if (ret == LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS) {
		/* the link destination exists, we need to update it
		 * by deleting the old one for the same DN then adding
		 * the new one */
		msg->elements = talloc_realloc(msg, msg->elements,
					       struct ldb_message_element,
					       msg->num_elements+1);
		if (msg->elements == NULL) {
			ldb_oom(ldb);
			talloc_free(tmp_ctx);
			return LDB_ERR_OPERATIONS_ERROR;
		}
		/* this relies on the backend matching the old entry
		   only by the DN portion of the extended DN */
		msg->elements[1] = msg->elements[0];
		msg->elements[0].flags = LDB_FLAG_MOD_DELETE;
		msg->num_elements++;

		ret = ldb_build_mod_req(&mod_req, ldb, tmp_ctx,
					msg,
					NULL,
					NULL, 
					ldb_op_default_callback,
					NULL);
		if (ret != LDB_SUCCESS) {
			talloc_free(tmp_ctx);
			return ret;
		}

		/* Run the new request */
		ret = ldb_next_request(module, mod_req);
		
		if (ret == LDB_SUCCESS) {
			ret = ldb_wait(mod_req->handle, LDB_WAIT_ALL);
		}
	}

	if (ret != LDB_SUCCESS) {
		ldb_debug(ldb, LDB_DEBUG_WARNING, "Failed to apply linked attribute change '%s' %s\n",
			  ldb_errstring(ldb),
			  ldb_ldif_message_string(ldb, tmp_ctx, LDB_CHANGETYPE_MODIFY, msg));
		ret = LDB_SUCCESS;
	}
	
	talloc_free(tmp_ctx);

	return ret;	
}

static int replmd_extended(struct ldb_module *module, struct ldb_request *req)
{
	if (strcmp(req->op.extended.oid, DSDB_EXTENDED_REPLICATED_OBJECTS_OID) == 0) {
		return replmd_extended_replicated_objects(module, req);
	}

	return ldb_next_request(module, req);
}


/*
  we hook into the transaction operations to allow us to 
  perform the linked attribute updates at the end of the whole
  transaction. This allows a forward linked attribute to be created
  before the object is created. During a vampire, w2k8 sends us linked
  attributes before the objects they are part of.
 */
static int replmd_start_transaction(struct ldb_module *module)
{
	/* create our private structure for this transaction */
	int i;
	struct replmd_private *replmd_private = talloc_get_type(ldb_module_get_private(module),
								struct replmd_private);
	talloc_free(replmd_private->la_ctx);
	replmd_private->la_list = NULL;
	replmd_private->la_ctx = NULL;

	for (i=0; i<replmd_private->num_ncs; i++) {
		replmd_private->ncs[i].mod_usn = 0;
	}

	return ldb_next_start_trans(module);
}

/*
  on prepare commit we loop over our queued la_context structures and
  apply each of them  
 */
static int replmd_prepare_commit(struct ldb_module *module)
{
	struct replmd_private *replmd_private = 
		talloc_get_type(ldb_module_get_private(module), struct replmd_private);
	struct la_entry *la, *prev;
	int ret;

	/* walk the list backwards, to do the first entry first, as we
	 * added the entries with DLIST_ADD() which puts them at the
	 * start of the list */
	for (la = replmd_private->la_list; la && la->next; la=la->next) ;

	for (; la; la=prev) {
		prev = la->prev;
		DLIST_REMOVE(replmd_private->la_list, la);
		ret = replmd_process_linked_attribute(module, la);
		if (ret != LDB_SUCCESS) {
			return ret;
		}
	}

	talloc_free(replmd_private->la_ctx);
	replmd_private->la_list = NULL;
	replmd_private->la_ctx = NULL;

	/* possibly change @REPLCHANGED */
	ret = replmd_notify_store(module);
	if (ret != LDB_SUCCESS) {
		return ret;
	}
	
	return ldb_next_prepare_commit(module);
}

static int replmd_del_transaction(struct ldb_module *module)
{
	struct replmd_private *replmd_private = 
		talloc_get_type(ldb_module_get_private(module), struct replmd_private);
	talloc_free(replmd_private->la_ctx);
	replmd_private->la_list = NULL;
	replmd_private->la_ctx = NULL;
	return ldb_next_del_trans(module);
}


_PUBLIC_ const struct ldb_module_ops ldb_repl_meta_data_module_ops = {
	.name          = "repl_meta_data",
	.init_context	   = replmd_init,
	.add               = replmd_add,
	.modify            = replmd_modify,
	.rename            = replmd_rename,
	.extended          = replmd_extended,
	.start_transaction = replmd_start_transaction,
	.prepare_commit    = replmd_prepare_commit,
	.del_transaction   = replmd_del_transaction,
};