s4:repl_meta_data LDB module - change counter variables to "unsigned" where appropriate
[ira/wip.git] / source4 / dsdb / samdb / ldb_modules / repl_meta_data.c
1 /* 
2    ldb database library
3
4    Copyright (C) Simo Sorce  2004-2008
5    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
6    Copyright (C) Andrew Tridgell 2005
7    Copyright (C) Stefan Metzmacher <metze@samba.org> 2007
8
9    This program is free software; you can redistribute it and/or modify
10    it under the terms of the GNU General Public License as published by
11    the Free Software Foundation; either version 3 of the License, or
12    (at your option) any later version.
13    
14    This program is distributed in the hope that it will be useful,
15    but WITHOUT ANY WARRANTY; without even the implied warranty of
16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17    GNU General Public License for more details.
18    
19    You should have received a copy of the GNU General Public License
20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
21 */
22
23 /*
24  *  Name: ldb
25  *
26  *  Component: ldb repl_meta_data module
27  *
28  *  Description: - add a unique objectGUID onto every new record,
29  *               - handle whenCreated, whenChanged timestamps
30  *               - handle uSNCreated, uSNChanged numbers
31  *               - handle replPropertyMetaData attribute
32  *
33  *  Author: Simo Sorce
34  *  Author: Stefan Metzmacher
35  */
36
37 #include "includes.h"
38 #include "ldb_module.h"
39 #include "dsdb/samdb/samdb.h"
40 #include "dsdb/common/proto.h"
41 #include "../libds/common/flags.h"
42 #include "librpc/gen_ndr/ndr_misc.h"
43 #include "librpc/gen_ndr/ndr_drsuapi.h"
44 #include "librpc/gen_ndr/ndr_drsblobs.h"
45 #include "param/param.h"
46 #include "libcli/security/dom_sid.h"
47 #include "lib/util/dlinklist.h"
48 #include "dsdb/samdb/ldb_modules/util.h"
49 #include "lib/util/binsearch.h"
50 #include "libcli/security/security.h"
51 #include "lib/util/tsort.h"
52
53 #define W2K3_LINKED_ATTRIBUTES 1
54
55 struct replmd_private {
56         TALLOC_CTX *la_ctx;
57         struct la_entry *la_list;
58         TALLOC_CTX *bl_ctx;
59         struct la_backlink *la_backlinks;
60         struct nc_entry {
61                 struct nc_entry *prev, *next;
62                 struct ldb_dn *dn;
63                 uint64_t mod_usn;
64                 uint64_t mod_usn_urgent;
65         } *ncs;
66 };
67
68 struct la_entry {
69         struct la_entry *next, *prev;
70         struct drsuapi_DsReplicaLinkedAttribute *la;
71 };
72
73 struct replmd_replicated_request {
74         struct ldb_module *module;
75         struct ldb_request *req;
76
77         const struct dsdb_schema *schema;
78
79         /* the controls we pass down */
80         struct ldb_control **controls;
81
82         /* details for the mode where we apply a bunch of inbound replication meessages */
83         bool apply_mode;
84         uint32_t index_current;
85         struct dsdb_extended_replicated_objects *objs;
86
87         struct ldb_message *search_msg;
88
89         uint64_t seq_num;
90         bool is_urgent;
91 };
92
93 enum urgent_situation {
94         REPL_URGENT_ON_CREATE = 1,
95         REPL_URGENT_ON_UPDATE = 2,
96         REPL_URGENT_ON_DELETE = 4
97 };
98
99
100 static const struct {
101         const char *update_name;
102         enum urgent_situation repl_situation;
103 } urgent_objects[] = {
104                 {"nTDSDSA", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_DELETE)},
105                 {"crossRef", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_DELETE)},
106                 {"attributeSchema", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
107                 {"classSchema", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
108                 {"secret", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
109                 {"rIDManager", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
110                 {NULL, 0}
111 };
112
113 /* Attributes looked for when updating or deleting, to check for a urgent replication needed */
114 static const char *urgent_attrs[] = {
115                 "lockoutTime",
116                 "pwdLastSet",
117                 "userAccountControl",
118                 NULL
119 };
120
121
122 static bool replmd_check_urgent_objectclass(const struct ldb_message_element *objectclass_el,
123                                         enum urgent_situation situation)
124 {
125         int i, j;
126         for (i=0; urgent_objects[i].update_name; i++) {
127
128                 if ((situation & urgent_objects[i].repl_situation) == 0) {
129                         continue;
130                 }
131
132                 for (j=0; j<objectclass_el->num_values; j++) {
133                         const struct ldb_val *v = &objectclass_el->values[j];
134                         if (ldb_attr_cmp((const char *)v->data, urgent_objects[i].update_name) == 0) {
135                                 return true;
136                         }
137                 }
138         }
139         return false;
140 }
141
142 static bool replmd_check_urgent_attribute(const struct ldb_message_element *el)
143 {
144         if (ldb_attr_in_list(urgent_attrs, el->name)) {
145                 return true;
146         }
147         return false;
148 }
149
150
151 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar);
152
153 /*
154   initialise the module
155   allocate the private structure and build the list
156   of partition DNs for use by replmd_notify()
157  */
158 static int replmd_init(struct ldb_module *module)
159 {
160         struct replmd_private *replmd_private;
161         struct ldb_context *ldb = ldb_module_get_ctx(module);
162
163         replmd_private = talloc_zero(module, struct replmd_private);
164         if (replmd_private == NULL) {
165                 ldb_oom(ldb);
166                 return LDB_ERR_OPERATIONS_ERROR;
167         }
168         ldb_module_set_private(module, replmd_private);
169
170         return ldb_next_init(module);
171 }
172
173 /*
174   cleanup our per-transaction contexts
175  */
176 static void replmd_txn_cleanup(struct replmd_private *replmd_private)
177 {
178         talloc_free(replmd_private->la_ctx);
179         replmd_private->la_list = NULL;
180         replmd_private->la_ctx = NULL;
181
182         talloc_free(replmd_private->bl_ctx);
183         replmd_private->la_backlinks = NULL;
184         replmd_private->bl_ctx = NULL;
185 }
186
187
188 struct la_backlink {
189         struct la_backlink *next, *prev;
190         const char *attr_name;
191         struct GUID forward_guid, target_guid;
192         bool active;
193 };
194
195 /*
196   process a backlinks we accumulated during a transaction, adding and
197   deleting the backlinks from the target objects
198  */
199 static int replmd_process_backlink(struct ldb_module *module, struct la_backlink *bl)
200 {
201         struct ldb_dn *target_dn, *source_dn;
202         int ret;
203         struct ldb_context *ldb = ldb_module_get_ctx(module);
204         struct ldb_message *msg;
205         TALLOC_CTX *tmp_ctx = talloc_new(bl);
206         char *dn_string;
207
208         /*
209           - find DN of target
210           - find DN of source
211           - construct ldb_message
212               - either an add or a delete
213          */
214         ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->target_guid, &target_dn);
215         if (ret != LDB_SUCCESS) {
216                 ldb_asprintf_errstring(ldb, "Failed to find target DN for linked attribute with GUID %s\n",
217                                        GUID_string(bl, &bl->target_guid));
218                 talloc_free(tmp_ctx);
219                 return ret;
220         }
221
222         ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->forward_guid, &source_dn);
223         if (ret != LDB_SUCCESS) {
224                 ldb_asprintf_errstring(ldb, "Failed to find source DN for linked attribute with GUID %s\n",
225                                        GUID_string(bl, &bl->forward_guid));
226                 talloc_free(tmp_ctx);
227                 return ret;
228         }
229
230         msg = ldb_msg_new(tmp_ctx);
231         if (msg == NULL) {
232                 ldb_module_oom(module);
233                 talloc_free(tmp_ctx);
234                 return LDB_ERR_OPERATIONS_ERROR;
235         }
236
237         /* construct a ldb_message for adding/deleting the backlink */
238         msg->dn = target_dn;
239         dn_string = ldb_dn_get_extended_linearized(tmp_ctx, source_dn, 1);
240         if (!dn_string) {
241                 ldb_module_oom(module);
242                 talloc_free(tmp_ctx);
243                 return LDB_ERR_OPERATIONS_ERROR;
244         }
245         ret = ldb_msg_add_steal_string(msg, bl->attr_name, dn_string);
246         if (ret != LDB_SUCCESS) {
247                 talloc_free(tmp_ctx);
248                 return ret;
249         }
250         msg->elements[0].flags = bl->active?LDB_FLAG_MOD_ADD:LDB_FLAG_MOD_DELETE;
251
252         ret = dsdb_module_modify(module, msg, 0);
253         if (ret != LDB_SUCCESS) {
254                 ldb_asprintf_errstring(ldb, "Failed to %s backlink from %s to %s - %s",
255                                        bl->active?"add":"remove",
256                                        ldb_dn_get_linearized(source_dn),
257                                        ldb_dn_get_linearized(target_dn),
258                                        ldb_errstring(ldb));
259                 talloc_free(tmp_ctx);
260                 return ret;
261         }
262         talloc_free(tmp_ctx);
263         return ret;
264 }
265
266 /*
267   add a backlink to the list of backlinks to add/delete in the prepare
268   commit
269  */
270 static int replmd_add_backlink(struct ldb_module *module, const struct dsdb_schema *schema,
271                                struct GUID *forward_guid, struct GUID *target_guid,
272                                bool active, const struct dsdb_attribute *schema_attr, bool immediate)
273 {
274         const struct dsdb_attribute *target_attr;
275         struct la_backlink *bl;
276         struct replmd_private *replmd_private =
277                 talloc_get_type_abort(ldb_module_get_private(module), struct replmd_private);
278
279         target_attr = dsdb_attribute_by_linkID(schema, schema_attr->linkID ^ 1);
280         if (!target_attr) {
281                 /*
282                  * windows 2003 has a broken schema where the
283                  * definition of msDS-IsDomainFor is missing (which is
284                  * supposed to be the backlink of the
285                  * msDS-HasDomainNCs attribute
286                  */
287                 return LDB_SUCCESS;
288         }
289
290         /* see if its already in the list */
291         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
292                 if (GUID_equal(forward_guid, &bl->forward_guid) &&
293                     GUID_equal(target_guid, &bl->target_guid) &&
294                     (target_attr->lDAPDisplayName == bl->attr_name ||
295                      strcmp(target_attr->lDAPDisplayName, bl->attr_name) == 0)) {
296                         break;
297                 }
298         }
299
300         if (bl) {
301                 /* we found an existing one */
302                 if (bl->active == active) {
303                         return LDB_SUCCESS;
304                 }
305                 DLIST_REMOVE(replmd_private->la_backlinks, bl);
306                 talloc_free(bl);
307                 return LDB_SUCCESS;
308         }
309
310         if (replmd_private->bl_ctx == NULL) {
311                 replmd_private->bl_ctx = talloc_new(replmd_private);
312                 if (replmd_private->bl_ctx == NULL) {
313                         ldb_module_oom(module);
314                         return LDB_ERR_OPERATIONS_ERROR;
315                 }
316         }
317
318         /* its a new one */
319         bl = talloc(replmd_private->bl_ctx, struct la_backlink);
320         if (bl == NULL) {
321                 ldb_module_oom(module);
322                 return LDB_ERR_OPERATIONS_ERROR;
323         }
324
325         bl->attr_name = target_attr->lDAPDisplayName;
326         bl->forward_guid = *forward_guid;
327         bl->target_guid = *target_guid;
328         bl->active = active;
329
330         /* the caller may ask for this backlink to be processed
331            immediately */
332         if (immediate) {
333                 int ret = replmd_process_backlink(module, bl);
334                 talloc_free(bl);
335                 return ret;
336         }
337
338         DLIST_ADD(replmd_private->la_backlinks, bl);
339
340         return LDB_SUCCESS;
341 }
342
343
344 /*
345  * Callback for most write operations in this module:
346  * 
347  * notify the repl task that a object has changed. The notifies are
348  * gathered up in the replmd_private structure then written to the
349  * @REPLCHANGED object in each partition during the prepare_commit
350  */
351 static int replmd_op_callback(struct ldb_request *req, struct ldb_reply *ares)
352 {
353         int ret;
354         struct replmd_replicated_request *ac = 
355                 talloc_get_type_abort(req->context, struct replmd_replicated_request);
356         struct replmd_private *replmd_private = 
357                 talloc_get_type_abort(ldb_module_get_private(ac->module), struct replmd_private);
358         struct nc_entry *modified_partition;
359         struct ldb_control *partition_ctrl;
360         const struct dsdb_control_current_partition *partition;
361
362         struct ldb_control **controls;
363
364         partition_ctrl = ldb_reply_get_control(ares, DSDB_CONTROL_CURRENT_PARTITION_OID);
365
366         /* Remove the 'partition' control from what we pass up the chain */
367         controls = controls_except_specified(ares->controls, ares, partition_ctrl);
368
369         if (ares->error != LDB_SUCCESS) {
370                 return ldb_module_done(ac->req, controls,
371                                         ares->response, ares->error);
372         }
373
374         if (ares->type != LDB_REPLY_DONE) {
375                 ldb_set_errstring(ldb_module_get_ctx(ac->module), "Invalid reply type for notify\n!");
376                 return ldb_module_done(ac->req, NULL,
377                                        NULL, LDB_ERR_OPERATIONS_ERROR);
378         }
379
380         if (!partition_ctrl) {
381                 ldb_set_errstring(ldb_module_get_ctx(ac->module),"No partition control on reply");
382                 return ldb_module_done(ac->req, NULL,
383                                        NULL, LDB_ERR_OPERATIONS_ERROR);
384         }
385
386         partition = talloc_get_type_abort(partition_ctrl->data,
387                                     struct dsdb_control_current_partition);
388         
389         if (ac->seq_num > 0) {
390                 for (modified_partition = replmd_private->ncs; modified_partition; 
391                      modified_partition = modified_partition->next) {
392                         if (ldb_dn_compare(modified_partition->dn, partition->dn) == 0) {
393                                 break;
394                         }
395                 }
396                 
397                 if (modified_partition == NULL) {
398                         modified_partition = talloc_zero(replmd_private, struct nc_entry);
399                         if (!modified_partition) {
400                                 ldb_oom(ldb_module_get_ctx(ac->module));
401                                 return ldb_module_done(ac->req, NULL,
402                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
403                         }
404                         modified_partition->dn = ldb_dn_copy(modified_partition, partition->dn);
405                         if (!modified_partition->dn) {
406                                 ldb_oom(ldb_module_get_ctx(ac->module));
407                                 return ldb_module_done(ac->req, NULL,
408                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
409                         }
410                         DLIST_ADD(replmd_private->ncs, modified_partition);
411                 }
412
413                 if (ac->seq_num > modified_partition->mod_usn) {
414                         modified_partition->mod_usn = ac->seq_num;
415                         if (ac->is_urgent) {
416                                 modified_partition->mod_usn_urgent = ac->seq_num;
417                         }
418                 }
419         }
420
421         if (ac->apply_mode) {
422                 talloc_free(ares);
423                 ac->index_current++;
424                 
425                 ret = replmd_replicated_apply_next(ac);
426                 if (ret != LDB_SUCCESS) {
427                         return ldb_module_done(ac->req, NULL, NULL, ret);
428                 }
429                 return ret;
430         } else {
431                 /* free the partition control container here, for the
432                  * common path.  Other cases will have it cleaned up
433                  * eventually with the ares */
434                 talloc_free(partition_ctrl);
435                 return ldb_module_done(ac->req, 
436                                        controls_except_specified(controls, ares, partition_ctrl),
437                                        ares->response, LDB_SUCCESS);
438         }
439 }
440
441
442 /*
443  * update a @REPLCHANGED record in each partition if there have been
444  * any writes of replicated data in the partition
445  */
446 static int replmd_notify_store(struct ldb_module *module)
447 {
448         struct replmd_private *replmd_private =
449                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
450         struct ldb_context *ldb = ldb_module_get_ctx(module);
451
452         while (replmd_private->ncs) {
453                 int ret;
454                 struct nc_entry *modified_partition = replmd_private->ncs;
455
456                 ret = dsdb_save_partition_usn(ldb, modified_partition->dn,
457                                                 modified_partition->mod_usn,
458                                                 modified_partition->mod_usn_urgent);
459                 if (ret != LDB_SUCCESS) {
460                         DEBUG(0,(__location__ ": Failed to save partition uSN for %s\n",
461                                  ldb_dn_get_linearized(modified_partition->dn)));
462                         return ret;
463                 }
464                 DLIST_REMOVE(replmd_private->ncs, modified_partition);
465                 talloc_free(modified_partition);
466         }
467
468         return LDB_SUCCESS;
469 }
470
471
472 /*
473   created a replmd_replicated_request context
474  */
475 static struct replmd_replicated_request *replmd_ctx_init(struct ldb_module *module,
476                                                          struct ldb_request *req)
477 {
478         struct ldb_context *ldb;
479         struct replmd_replicated_request *ac;
480
481         ldb = ldb_module_get_ctx(module);
482
483         ac = talloc_zero(req, struct replmd_replicated_request);
484         if (ac == NULL) {
485                 ldb_oom(ldb);
486                 return NULL;
487         }
488
489         ac->module = module;
490         ac->req = req;
491
492         ac->schema = dsdb_get_schema(ldb);
493         if (!ac->schema) {
494                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
495                               "replmd_modify: no dsdb_schema loaded");
496                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
497                 return NULL;
498         }
499
500         return ac;
501 }
502
503 /*
504   add a time element to a record
505 */
506 static int add_time_element(struct ldb_message *msg, const char *attr, time_t t)
507 {
508         struct ldb_message_element *el;
509         char *s;
510
511         if (ldb_msg_find_element(msg, attr) != NULL) {
512                 return LDB_SUCCESS;
513         }
514
515         s = ldb_timestring(msg, t);
516         if (s == NULL) {
517                 return LDB_ERR_OPERATIONS_ERROR;
518         }
519
520         if (ldb_msg_add_string(msg, attr, s) != LDB_SUCCESS) {
521                 return LDB_ERR_OPERATIONS_ERROR;
522         }
523
524         el = ldb_msg_find_element(msg, attr);
525         /* always set as replace. This works because on add ops, the flag
526            is ignored */
527         el->flags = LDB_FLAG_MOD_REPLACE;
528
529         return LDB_SUCCESS;
530 }
531
532 /*
533   add a uint64_t element to a record
534 */
535 static int add_uint64_element(struct ldb_message *msg, const char *attr, uint64_t v)
536 {
537         struct ldb_message_element *el;
538
539         if (ldb_msg_find_element(msg, attr) != NULL) {
540                 return LDB_SUCCESS;
541         }
542
543         if (ldb_msg_add_fmt(msg, attr, "%llu", (unsigned long long)v) != LDB_SUCCESS) {
544                 return LDB_ERR_OPERATIONS_ERROR;
545         }
546
547         el = ldb_msg_find_element(msg, attr);
548         /* always set as replace. This works because on add ops, the flag
549            is ignored */
550         el->flags = LDB_FLAG_MOD_REPLACE;
551
552         return LDB_SUCCESS;
553 }
554
555 static int replmd_replPropertyMetaData1_attid_sort(const struct replPropertyMetaData1 *m1,
556                                                    const struct replPropertyMetaData1 *m2,
557                                                    const uint32_t *rdn_attid)
558 {
559         if (m1->attid == m2->attid) {
560                 return 0;
561         }
562
563         /*
564          * the rdn attribute should be at the end!
565          * so we need to return a value greater than zero
566          * which means m1 is greater than m2
567          */
568         if (m1->attid == *rdn_attid) {
569                 return 1;
570         }
571
572         /*
573          * the rdn attribute should be at the end!
574          * so we need to return a value less than zero
575          * which means m2 is greater than m1
576          */
577         if (m2->attid == *rdn_attid) {
578                 return -1;
579         }
580
581         return m1->attid > m2->attid ? 1 : -1;
582 }
583
584 static int replmd_replPropertyMetaDataCtr1_sort(struct replPropertyMetaDataCtr1 *ctr1,
585                                                 const struct dsdb_schema *schema,
586                                                 struct ldb_dn *dn)
587 {
588         const char *rdn_name;
589         const struct dsdb_attribute *rdn_sa;
590
591         rdn_name = ldb_dn_get_rdn_name(dn);
592         if (!rdn_name) {
593                 DEBUG(0,(__location__ ": No rDN for %s?\n", ldb_dn_get_linearized(dn)));
594                 return LDB_ERR_OPERATIONS_ERROR;
595         }
596
597         rdn_sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
598         if (rdn_sa == NULL) {
599                 DEBUG(0,(__location__ ": No sa found for rDN %s for %s\n", rdn_name, ldb_dn_get_linearized(dn)));
600                 return LDB_ERR_OPERATIONS_ERROR;                
601         }
602
603         DEBUG(6,("Sorting rpmd with attid exception %u rDN=%s DN=%s\n", 
604                  rdn_sa->attributeID_id, rdn_name, ldb_dn_get_linearized(dn)));
605
606         LDB_TYPESAFE_QSORT(ctr1->array, ctr1->count, &rdn_sa->attributeID_id, replmd_replPropertyMetaData1_attid_sort);
607
608         return LDB_SUCCESS;
609 }
610
611 static int replmd_ldb_message_element_attid_sort(const struct ldb_message_element *e1,
612                                                  const struct ldb_message_element *e2,
613                                                  const struct dsdb_schema *schema)
614 {
615         const struct dsdb_attribute *a1;
616         const struct dsdb_attribute *a2;
617
618         /* 
619          * TODO: make this faster by caching the dsdb_attribute pointer
620          *       on the ldb_messag_element
621          */
622
623         a1 = dsdb_attribute_by_lDAPDisplayName(schema, e1->name);
624         a2 = dsdb_attribute_by_lDAPDisplayName(schema, e2->name);
625
626         /*
627          * TODO: remove this check, we should rely on e1 and e2 having valid attribute names
628          *       in the schema
629          */
630         if (!a1 || !a2) {
631                 return strcasecmp(e1->name, e2->name);
632         }
633         if (a1->attributeID_id == a2->attributeID_id) {
634                 return 0;
635         }
636         return a1->attributeID_id > a2->attributeID_id ? 1 : -1;
637 }
638
639 static void replmd_ldb_message_sort(struct ldb_message *msg,
640                                     const struct dsdb_schema *schema)
641 {
642         LDB_TYPESAFE_QSORT(msg->elements, msg->num_elements, schema, replmd_ldb_message_element_attid_sort);
643 }
644
645 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
646                                const struct GUID *invocation_id, uint64_t seq_num,
647                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted);
648
649
650 /*
651   fix up linked attributes in replmd_add.
652   This involves setting up the right meta-data in extended DN
653   components, and creating backlinks to the object
654  */
655 static int replmd_add_fix_la(struct ldb_module *module, struct ldb_message_element *el,
656                              uint64_t seq_num, const struct GUID *invocationId, time_t t,
657                              struct GUID *guid, const struct dsdb_attribute *sa)
658 {
659         unsigned int i;
660         TALLOC_CTX *tmp_ctx = talloc_new(el->values);
661         struct ldb_context *ldb = ldb_module_get_ctx(module);
662         struct dsdb_schema *schema = dsdb_get_schema(ldb);
663         NTTIME now;
664
665         unix_to_nt_time(&now, t);
666
667         for (i=0; i<el->num_values; i++) {
668                 struct ldb_val *v = &el->values[i];
669                 struct dsdb_dn *dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, v, sa->syntax->ldap_oid);
670                 struct GUID target_guid;
671                 NTSTATUS status;
672                 int ret;
673
674                 /* note that the DN already has the extended
675                    components from the extended_dn_store module */
676                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
677                 if (!NT_STATUS_IS_OK(status) || GUID_all_zero(&target_guid)) {
678                         ret = dsdb_module_guid_by_dn(module, dsdb_dn->dn, &target_guid);
679                         if (ret != LDB_SUCCESS) {
680                                 talloc_free(tmp_ctx);
681                                 return ret;
682                         }
683                         ret = dsdb_set_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
684                         if (ret != LDB_SUCCESS) {
685                                 talloc_free(tmp_ctx);
686                                 return ret;
687                         }
688                 }
689
690                 ret = replmd_build_la_val(el->values, v, dsdb_dn, invocationId,
691                                           seq_num, seq_num, now, 0, false);
692                 if (ret != LDB_SUCCESS) {
693                         talloc_free(tmp_ctx);
694                         return ret;
695                 }
696
697                 ret = replmd_add_backlink(module, schema, guid, &target_guid, true, sa, false);
698                 if (ret != LDB_SUCCESS) {
699                         talloc_free(tmp_ctx);
700                         return ret;
701                 }
702         }
703
704         talloc_free(tmp_ctx);
705         return LDB_SUCCESS;
706 }
707
708
709 /*
710   intercept add requests
711  */
712 static int replmd_add(struct ldb_module *module, struct ldb_request *req)
713 {
714         struct ldb_context *ldb;
715         struct ldb_control *control;
716         struct replmd_replicated_request *ac;
717         enum ndr_err_code ndr_err;
718         struct ldb_request *down_req;
719         struct ldb_message *msg;
720         const DATA_BLOB *guid_blob;
721         struct GUID guid;
722         struct replPropertyMetaDataBlob nmd;
723         struct ldb_val nmd_value;
724         const struct GUID *our_invocation_id;
725         time_t t = time(NULL);
726         NTTIME now;
727         char *time_str;
728         int ret;
729         unsigned int i;
730         uint32_t ni=0;
731         bool allow_add_guid = false;
732         bool remove_current_guid = false;
733         bool is_urgent = false;
734         struct ldb_message_element *objectclass_el;
735
736         /* check if there's a show relax control (used by provision to say 'I know what I'm doing') */
737         control = ldb_request_get_control(req, LDB_CONTROL_RELAX_OID);
738         if (control) {
739                 allow_add_guid = true;
740         }
741
742         /* do not manipulate our control entries */
743         if (ldb_dn_is_special(req->op.add.message->dn)) {
744                 return ldb_next_request(module, req);
745         }
746
747         ldb = ldb_module_get_ctx(module);
748
749         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_add\n");
750
751         ac = replmd_ctx_init(module, req);
752         if (!ac) {
753                 return LDB_ERR_OPERATIONS_ERROR;
754         }
755
756         guid_blob = ldb_msg_find_ldb_val(req->op.add.message, "objectGUID");
757         if ( guid_blob != NULL ) {
758                 if( !allow_add_guid ) {
759                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
760                               "replmd_add: it's not allowed to add an object with objectGUID\n");
761                         talloc_free(ac);
762                         return LDB_ERR_UNWILLING_TO_PERFORM;
763                 } else {
764                         NTSTATUS status = GUID_from_data_blob(guid_blob,&guid);
765                         if ( !NT_STATUS_IS_OK(status)) {
766                                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
767                                       "replmd_add: Unable to parse as a GUID the attribute objectGUID\n");
768                                 talloc_free(ac);
769                                 return LDB_ERR_UNWILLING_TO_PERFORM;
770                         }
771                         /* we remove this attribute as it can be a string and will not be treated 
772                         correctly and then we will readd it latter on in the good format*/
773                         remove_current_guid = true;
774                 }
775         } else {
776                 /* a new GUID */
777                 guid = GUID_random();
778         }
779
780         /* Get a sequence number from the backend */
781         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
782         if (ret != LDB_SUCCESS) {
783                 talloc_free(ac);
784                 return ret;
785         }
786
787         /* get our invocationId */
788         our_invocation_id = samdb_ntds_invocation_id(ldb);
789         if (!our_invocation_id) {
790                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
791                               "replmd_add: unable to find invocationId\n");
792                 talloc_free(ac);
793                 return LDB_ERR_OPERATIONS_ERROR;
794         }
795
796         /* we have to copy the message as the caller might have it as a const */
797         msg = ldb_msg_copy_shallow(ac, req->op.add.message);
798         if (msg == NULL) {
799                 ldb_oom(ldb);
800                 talloc_free(ac);
801                 return LDB_ERR_OPERATIONS_ERROR;
802         }
803
804         /* generated times */
805         unix_to_nt_time(&now, t);
806         time_str = ldb_timestring(msg, t);
807         if (!time_str) {
808                 ldb_oom(ldb);
809                 talloc_free(ac);
810                 return LDB_ERR_OPERATIONS_ERROR;
811         }
812         if (remove_current_guid) {
813                 ldb_msg_remove_attr(msg,"objectGUID");
814         }
815
816         /* 
817          * remove autogenerated attributes
818          */
819         ldb_msg_remove_attr(msg, "whenCreated");
820         ldb_msg_remove_attr(msg, "whenChanged");
821         ldb_msg_remove_attr(msg, "uSNCreated");
822         ldb_msg_remove_attr(msg, "uSNChanged");
823         ldb_msg_remove_attr(msg, "replPropertyMetaData");
824
825         /*
826          * readd replicated attributes
827          */
828         ret = ldb_msg_add_string(msg, "whenCreated", time_str);
829         if (ret != LDB_SUCCESS) {
830                 ldb_oom(ldb);
831                 talloc_free(ac);
832                 return ret;
833         }
834
835         /* build the replication meta_data */
836         ZERO_STRUCT(nmd);
837         nmd.version             = 1;
838         nmd.ctr.ctr1.count      = msg->num_elements;
839         nmd.ctr.ctr1.array      = talloc_array(msg,
840                                                struct replPropertyMetaData1,
841                                                nmd.ctr.ctr1.count);
842         if (!nmd.ctr.ctr1.array) {
843                 ldb_oom(ldb);
844                 talloc_free(ac);
845                 return LDB_ERR_OPERATIONS_ERROR;
846         }
847
848         for (i=0; i < msg->num_elements; i++) {
849                 struct ldb_message_element *e = &msg->elements[i];
850                 struct replPropertyMetaData1 *m = &nmd.ctr.ctr1.array[ni];
851                 const struct dsdb_attribute *sa;
852
853                 if (e->name[0] == '@') continue;
854
855                 sa = dsdb_attribute_by_lDAPDisplayName(ac->schema, e->name);
856                 if (!sa) {
857                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
858                                       "replmd_add: attribute '%s' not defined in schema\n",
859                                       e->name);
860                         talloc_free(ac);
861                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
862                 }
863
864                 if ((sa->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (sa->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
865                         /* if the attribute is not replicated (0x00000001)
866                          * or constructed (0x00000004) it has no metadata
867                          */
868                         continue;
869                 }
870
871 #if W2K3_LINKED_ATTRIBUTES
872                 if (sa->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
873                         ret = replmd_add_fix_la(module, e, ac->seq_num, our_invocation_id, t, &guid, sa);
874                         if (ret != LDB_SUCCESS) {
875                                 talloc_free(ac);
876                                 return ret;
877                         }
878                         /* linked attributes are not stored in
879                            replPropertyMetaData in FL above w2k */
880                         continue;
881                 }
882 #endif
883
884                 m->attid                        = sa->attributeID_id;
885                 m->version                      = 1;
886                 m->originating_change_time      = now;
887                 m->originating_invocation_id    = *our_invocation_id;
888                 m->originating_usn              = ac->seq_num;
889                 m->local_usn                    = ac->seq_num;
890                 ni++;
891         }
892
893         /* fix meta data count */
894         nmd.ctr.ctr1.count = ni;
895
896         /*
897          * sort meta data array, and move the rdn attribute entry to the end
898          */
899         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ac->schema, msg->dn);
900         if (ret != LDB_SUCCESS) {
901                 talloc_free(ac);
902                 return ret;
903         }
904
905         /* generated NDR encoded values */
906         ndr_err = ndr_push_struct_blob(&nmd_value, msg, 
907                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
908                                        &nmd,
909                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
910         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
911                 ldb_oom(ldb);
912                 talloc_free(ac);
913                 return LDB_ERR_OPERATIONS_ERROR;
914         }
915
916         /*
917          * add the autogenerated values
918          */
919         ret = dsdb_msg_add_guid(msg, &guid, "objectGUID");
920         if (ret != LDB_SUCCESS) {
921                 ldb_oom(ldb);
922                 talloc_free(ac);
923                 return ret;
924         }
925         ret = ldb_msg_add_string(msg, "whenChanged", time_str);
926         if (ret != LDB_SUCCESS) {
927                 ldb_oom(ldb);
928                 talloc_free(ac);
929                 return ret;
930         }
931         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ac->seq_num);
932         if (ret != LDB_SUCCESS) {
933                 ldb_oom(ldb);
934                 talloc_free(ac);
935                 return ret;
936         }
937         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ac->seq_num);
938         if (ret != LDB_SUCCESS) {
939                 ldb_oom(ldb);
940                 talloc_free(ac);
941                 return ret;
942         }
943         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
944         if (ret != LDB_SUCCESS) {
945                 ldb_oom(ldb);
946                 talloc_free(ac);
947                 return ret;
948         }
949
950         /*
951          * sort the attributes by attid before storing the object
952          */
953         replmd_ldb_message_sort(msg, ac->schema);
954
955         objectclass_el = ldb_msg_find_element(msg, "objectClass");
956         is_urgent = replmd_check_urgent_objectclass(objectclass_el,
957                                                         REPL_URGENT_ON_CREATE);
958
959         ac->is_urgent = is_urgent;
960         ret = ldb_build_add_req(&down_req, ldb, ac,
961                                 msg,
962                                 req->controls,
963                                 ac, replmd_op_callback,
964                                 req);
965
966         if (ret != LDB_SUCCESS) {
967                 talloc_free(ac);
968                 return ret;
969         }
970
971         /* mark the control done */
972         if (control) {
973                 control->critical = 0;
974         }
975
976         /* go on with the call chain */
977         return ldb_next_request(module, down_req);
978 }
979
980
981 /*
982  * update the replPropertyMetaData for one element
983  */
984 static int replmd_update_rpmd_element(struct ldb_context *ldb,
985                                       struct ldb_message *msg,
986                                       struct ldb_message_element *el,
987                                       struct ldb_message_element *old_el,
988                                       struct replPropertyMetaDataBlob *omd,
989                                       const struct dsdb_schema *schema,
990                                       uint64_t *seq_num,
991                                       const struct GUID *our_invocation_id,
992                                       NTTIME now)
993 {
994         uint32_t i;
995         const struct dsdb_attribute *a;
996         struct replPropertyMetaData1 *md1;
997
998         a = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
999         if (a == NULL) {
1000                 DEBUG(0,(__location__ ": Unable to find attribute %s in schema\n",
1001                          el->name));
1002                 return LDB_ERR_OPERATIONS_ERROR;
1003         }
1004
1005         if ((a->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (a->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
1006                 return LDB_SUCCESS;
1007         }
1008
1009         /* if the attribute's value haven't changed then return LDB_SUCCESS     */
1010         if (old_el != NULL && ldb_msg_element_compare(el, old_el) == 0) {
1011                 return LDB_SUCCESS;
1012         }
1013
1014         for (i=0; i<omd->ctr.ctr1.count; i++) {
1015                 if (a->attributeID_id == omd->ctr.ctr1.array[i].attid) break;
1016         }
1017
1018 #if W2K3_LINKED_ATTRIBUTES
1019         if (a->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
1020                 /* linked attributes are not stored in
1021                    replPropertyMetaData in FL above w2k, but we do
1022                    raise the seqnum for the object  */
1023                 if (*seq_num == 0 &&
1024                     ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num) != LDB_SUCCESS) {
1025                         return LDB_ERR_OPERATIONS_ERROR;
1026                 }
1027                 return LDB_SUCCESS;
1028         }
1029 #endif
1030
1031         if (i == omd->ctr.ctr1.count) {
1032                 /* we need to add a new one */
1033                 omd->ctr.ctr1.array = talloc_realloc(msg, omd->ctr.ctr1.array, 
1034                                                      struct replPropertyMetaData1, omd->ctr.ctr1.count+1);
1035                 if (omd->ctr.ctr1.array == NULL) {
1036                         ldb_oom(ldb);
1037                         return LDB_ERR_OPERATIONS_ERROR;
1038                 }
1039                 omd->ctr.ctr1.count++;
1040                 ZERO_STRUCT(omd->ctr.ctr1.array[i]);
1041         }
1042
1043         /* Get a new sequence number from the backend. We only do this
1044          * if we have a change that requires a new
1045          * replPropertyMetaData element 
1046          */
1047         if (*seq_num == 0) {
1048                 int ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num);
1049                 if (ret != LDB_SUCCESS) {
1050                         return LDB_ERR_OPERATIONS_ERROR;
1051                 }
1052         }
1053
1054         md1 = &omd->ctr.ctr1.array[i];
1055         md1->version++;
1056         md1->attid                     = a->attributeID_id;
1057         md1->originating_change_time   = now;
1058         md1->originating_invocation_id = *our_invocation_id;
1059         md1->originating_usn           = *seq_num;
1060         md1->local_usn                 = *seq_num;
1061         
1062         return LDB_SUCCESS;
1063 }
1064
1065 /*
1066  * update the replPropertyMetaData object each time we modify an
1067  * object. This is needed for DRS replication, as the merge on the
1068  * client is based on this object 
1069  */
1070 static int replmd_update_rpmd(struct ldb_module *module, 
1071                               const struct dsdb_schema *schema, 
1072                               struct ldb_message *msg, uint64_t *seq_num,
1073                               time_t t,
1074                               bool *is_urgent)
1075 {
1076         const struct ldb_val *omd_value;
1077         enum ndr_err_code ndr_err;
1078         struct replPropertyMetaDataBlob omd;
1079         unsigned int i;
1080         NTTIME now;
1081         const struct GUID *our_invocation_id;
1082         int ret;
1083         const char *attrs[] = { "replPropertyMetaData", "*", NULL };
1084         struct ldb_result *res;
1085         struct ldb_context *ldb;
1086         struct ldb_message_element *objectclass_el;
1087         enum urgent_situation situation;
1088
1089         ldb = ldb_module_get_ctx(module);
1090
1091         our_invocation_id = samdb_ntds_invocation_id(ldb);
1092         if (!our_invocation_id) {
1093                 /* this happens during an initial vampire while
1094                    updating the schema */
1095                 DEBUG(5,("No invocationID - skipping replPropertyMetaData update\n"));
1096                 return LDB_SUCCESS;
1097         }
1098
1099         unix_to_nt_time(&now, t);
1100
1101         /* search for the existing replPropertyMetaDataBlob. We need
1102          * to use REVEAL and ask for DNs in storage format to support
1103          * the check for values being the same in
1104          * replmd_update_rpmd_element()
1105          */
1106         ret = dsdb_module_search_dn(module, msg, &res, msg->dn, attrs,
1107                                     DSDB_SEARCH_SHOW_DELETED |
1108                                     DSDB_SEARCH_SHOW_EXTENDED_DN |
1109                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
1110                                     DSDB_SEARCH_REVEAL_INTERNALS);
1111         if (ret != LDB_SUCCESS || res->count != 1) {
1112                 DEBUG(0,(__location__ ": Object %s failed to find replPropertyMetaData\n",
1113                          ldb_dn_get_linearized(msg->dn)));
1114                 return LDB_ERR_OPERATIONS_ERROR;
1115         }
1116
1117         /* if isDeleted is present and is TRUE, then we consider we are deleting,
1118          * otherwise we consider we are updating */
1119         if (ldb_msg_check_string_attribute(msg, "isDeleted", "TRUE")) {
1120                 situation = REPL_URGENT_ON_DELETE;
1121         } else {
1122                 situation = REPL_URGENT_ON_UPDATE;
1123         }
1124
1125         objectclass_el = ldb_msg_find_element(res->msgs[0], "objectClass");
1126         if (is_urgent && replmd_check_urgent_objectclass(objectclass_el,
1127                                                         situation)) {
1128                 *is_urgent = true;
1129         }
1130
1131         omd_value = ldb_msg_find_ldb_val(res->msgs[0], "replPropertyMetaData");
1132         if (!omd_value) {
1133                 DEBUG(0,(__location__ ": Object %s does not have a replPropertyMetaData attribute\n",
1134                          ldb_dn_get_linearized(msg->dn)));
1135                 return LDB_ERR_OPERATIONS_ERROR;
1136         }
1137
1138         ndr_err = ndr_pull_struct_blob(omd_value, msg,
1139                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &omd,
1140                                        (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
1141         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1142                 DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
1143                          ldb_dn_get_linearized(msg->dn)));
1144                 return LDB_ERR_OPERATIONS_ERROR;
1145         }
1146
1147         if (omd.version != 1) {
1148                 DEBUG(0,(__location__ ": bad version %u in replPropertyMetaData for %s\n",
1149                          omd.version, ldb_dn_get_linearized(msg->dn)));
1150                 return LDB_ERR_OPERATIONS_ERROR;
1151         }
1152
1153         for (i=0; i<msg->num_elements; i++) {
1154                 struct ldb_message_element *old_el;
1155                 old_el = ldb_msg_find_element(res->msgs[0], msg->elements[i].name);
1156                 ret = replmd_update_rpmd_element(ldb, msg, &msg->elements[i], old_el, &omd, schema, seq_num,
1157                                                  our_invocation_id, now);
1158                 if (ret != LDB_SUCCESS) {
1159                         return ret;
1160                 }
1161
1162                 if (is_urgent && !*is_urgent && (situation == REPL_URGENT_ON_UPDATE)) {
1163                         *is_urgent = replmd_check_urgent_attribute(&msg->elements[i]);
1164                 }
1165
1166         }
1167
1168         /*
1169          * replmd_update_rpmd_element has done an update if the
1170          * seq_num is set
1171          */
1172         if (*seq_num != 0) {
1173                 struct ldb_val *md_value;
1174                 struct ldb_message_element *el;
1175
1176                 md_value = talloc(msg, struct ldb_val);
1177                 if (md_value == NULL) {
1178                         ldb_oom(ldb);
1179                         return LDB_ERR_OPERATIONS_ERROR;
1180                 }
1181
1182                 ret = replmd_replPropertyMetaDataCtr1_sort(&omd.ctr.ctr1, schema, msg->dn);
1183                 if (ret != LDB_SUCCESS) {
1184                         return ret;
1185                 }
1186
1187                 ndr_err = ndr_push_struct_blob(md_value, msg, 
1188                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
1189                                                &omd,
1190                                                (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
1191                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1192                         DEBUG(0,(__location__ ": Failed to marshall replPropertyMetaData for %s\n",
1193                                  ldb_dn_get_linearized(msg->dn)));
1194                         return LDB_ERR_OPERATIONS_ERROR;
1195                 }
1196
1197                 ret = ldb_msg_add_empty(msg, "replPropertyMetaData", LDB_FLAG_MOD_REPLACE, &el);
1198                 if (ret != LDB_SUCCESS) {
1199                         DEBUG(0,(__location__ ": Failed to add updated replPropertyMetaData %s\n",
1200                                  ldb_dn_get_linearized(msg->dn)));
1201                         return ret;
1202                 }
1203
1204                 el->num_values = 1;
1205                 el->values = md_value;
1206         }
1207
1208         return LDB_SUCCESS;     
1209 }
1210
1211 struct parsed_dn {
1212         struct dsdb_dn *dsdb_dn;
1213         struct GUID *guid;
1214         struct ldb_val *v;
1215 };
1216
1217 static int parsed_dn_compare(struct parsed_dn *pdn1, struct parsed_dn *pdn2)
1218 {
1219         return GUID_compare(pdn1->guid, pdn2->guid);
1220 }
1221
1222 static struct parsed_dn *parsed_dn_find(struct parsed_dn *pdn, int count, struct GUID *guid, struct ldb_dn *dn)
1223 {
1224         struct parsed_dn *ret;
1225         if (dn && GUID_all_zero(guid)) {
1226                 /* when updating a link using DRS, we sometimes get a
1227                    NULL GUID. We then need to try and match by DN */
1228                 int i;
1229                 for (i=0; i<count; i++) {
1230                         if (ldb_dn_compare(pdn[i].dsdb_dn->dn, dn) == 0) {
1231                                 dsdb_get_extended_dn_guid(pdn[i].dsdb_dn->dn, guid, "GUID");
1232                                 return &pdn[i];
1233                         }
1234                 }
1235                 return NULL;
1236         }
1237         BINARY_ARRAY_SEARCH(pdn, count, guid, guid, GUID_compare, ret);
1238         return ret;
1239 }
1240
1241 /*
1242   get a series of message element values as an array of DNs and GUIDs
1243   the result is sorted by GUID
1244  */
1245 static int get_parsed_dns(struct ldb_module *module, TALLOC_CTX *mem_ctx,
1246                           struct ldb_message_element *el, struct parsed_dn **pdn,
1247                           const char *ldap_oid)
1248 {
1249         unsigned int i;
1250         struct ldb_context *ldb = ldb_module_get_ctx(module);
1251
1252         if (el == NULL) {
1253                 *pdn = NULL;
1254                 return LDB_SUCCESS;
1255         }
1256
1257         (*pdn) = talloc_array(mem_ctx, struct parsed_dn, el->num_values);
1258         if (!*pdn) {
1259                 ldb_module_oom(module);
1260                 return LDB_ERR_OPERATIONS_ERROR;
1261         }
1262
1263         for (i=0; i<el->num_values; i++) {
1264                 struct ldb_val *v = &el->values[i];
1265                 NTSTATUS status;
1266                 struct ldb_dn *dn;
1267                 struct parsed_dn *p;
1268
1269                 p = &(*pdn)[i];
1270
1271                 p->dsdb_dn = dsdb_dn_parse(*pdn, ldb, v, ldap_oid);
1272                 if (p->dsdb_dn == NULL) {
1273                         return LDB_ERR_INVALID_DN_SYNTAX;
1274                 }
1275
1276                 dn = p->dsdb_dn->dn;
1277
1278                 p->guid = talloc(*pdn, struct GUID);
1279                 if (p->guid == NULL) {
1280                         ldb_module_oom(module);
1281                         return LDB_ERR_OPERATIONS_ERROR;
1282                 }
1283
1284                 status = dsdb_get_extended_dn_guid(dn, p->guid, "GUID");
1285                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1286                         /* we got a DN without a GUID - go find the GUID */
1287                         int ret = dsdb_module_guid_by_dn(module, dn, p->guid);
1288                         if (ret != LDB_SUCCESS) {
1289                                 ldb_asprintf_errstring(ldb, "Unable to find GUID for DN %s\n",
1290                                                        ldb_dn_get_linearized(dn));
1291                                 return ret;
1292                         }
1293                         ret = dsdb_set_extended_dn_guid(dn, p->guid, "GUID");
1294                         if (ret != LDB_SUCCESS) {
1295                                 return ret;
1296                         }
1297                 } else if (!NT_STATUS_IS_OK(status)) {
1298                         return LDB_ERR_OPERATIONS_ERROR;
1299                 }
1300
1301                 /* keep a pointer to the original ldb_val */
1302                 p->v = v;
1303         }
1304
1305         TYPESAFE_QSORT(*pdn, el->num_values, parsed_dn_compare);
1306
1307         return LDB_SUCCESS;
1308 }
1309
1310 /*
1311   build a new extended DN, including all meta data fields
1312
1313   RMD_FLAGS           = DSDB_RMD_FLAG_* bits
1314   RMD_ADDTIME         = originating_add_time
1315   RMD_INVOCID         = originating_invocation_id
1316   RMD_CHANGETIME      = originating_change_time
1317   RMD_ORIGINATING_USN = originating_usn
1318   RMD_LOCAL_USN       = local_usn
1319   RMD_VERSION         = version
1320  */
1321 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1322                                const struct GUID *invocation_id, uint64_t seq_num,
1323                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted)
1324 {
1325         struct ldb_dn *dn = dsdb_dn->dn;
1326         const char *tstring, *usn_string, *flags_string;
1327         struct ldb_val tval;
1328         struct ldb_val iid;
1329         struct ldb_val usnv, local_usnv;
1330         struct ldb_val vers, flagsv;
1331         NTSTATUS status;
1332         int ret;
1333         const char *dnstring;
1334         char *vstring;
1335         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1336
1337         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1338         if (!tstring) {
1339                 return LDB_ERR_OPERATIONS_ERROR;
1340         }
1341         tval = data_blob_string_const(tstring);
1342
1343         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1344         if (!usn_string) {
1345                 return LDB_ERR_OPERATIONS_ERROR;
1346         }
1347         usnv = data_blob_string_const(usn_string);
1348
1349         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1350         if (!usn_string) {
1351                 return LDB_ERR_OPERATIONS_ERROR;
1352         }
1353         local_usnv = data_blob_string_const(usn_string);
1354
1355         vstring = talloc_asprintf(mem_ctx, "%lu", (unsigned long)version);
1356         if (!vstring) {
1357                 return LDB_ERR_OPERATIONS_ERROR;
1358         }
1359         vers = data_blob_string_const(vstring);
1360
1361         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1362         if (!NT_STATUS_IS_OK(status)) {
1363                 return LDB_ERR_OPERATIONS_ERROR;
1364         }
1365
1366         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1367         if (!flags_string) {
1368                 return LDB_ERR_OPERATIONS_ERROR;
1369         }
1370         flagsv = data_blob_string_const(flags_string);
1371
1372         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1373         if (ret != LDB_SUCCESS) return ret;
1374         ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", &tval);
1375         if (ret != LDB_SUCCESS) return ret;
1376         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1377         if (ret != LDB_SUCCESS) return ret;
1378         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1379         if (ret != LDB_SUCCESS) return ret;
1380         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1381         if (ret != LDB_SUCCESS) return ret;
1382         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1383         if (ret != LDB_SUCCESS) return ret;
1384         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1385         if (ret != LDB_SUCCESS) return ret;
1386
1387         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1388         if (dnstring == NULL) {
1389                 return LDB_ERR_OPERATIONS_ERROR;
1390         }
1391         *v = data_blob_string_const(dnstring);
1392
1393         return LDB_SUCCESS;
1394 }
1395
1396 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1397                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1398                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1399                                 uint32_t version, bool deleted);
1400
1401 /*
1402   check if any links need upgrading from w2k format
1403  */
1404 static int replmd_check_upgrade_links(struct parsed_dn *dns, uint32_t count, const struct GUID *invocation_id)
1405 {
1406         uint32_t i;
1407         for (i=0; i<count; i++) {
1408                 NTSTATUS status;
1409                 uint32_t version;
1410                 int ret;
1411
1412                 status = dsdb_get_extended_dn_uint32(dns[i].dsdb_dn->dn, &version, "RMD_VERSION");
1413                 if (!NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1414                         continue;
1415                 }
1416
1417                 /* it's an old one that needs upgrading */
1418                 ret = replmd_update_la_val(dns, dns[i].v, dns[i].dsdb_dn, dns[i].dsdb_dn, invocation_id,
1419                                            1, 1, 0, 0, false);
1420                 if (ret != LDB_SUCCESS) {
1421                         return ret;
1422                 }
1423         }
1424         return LDB_SUCCESS;
1425 }
1426
1427 /*
1428   update an extended DN, including all meta data fields
1429
1430   see replmd_build_la_val for value names
1431  */
1432 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1433                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1434                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1435                                 uint32_t version, bool deleted)
1436 {
1437         struct ldb_dn *dn = dsdb_dn->dn;
1438         const char *tstring, *usn_string, *flags_string;
1439         struct ldb_val tval;
1440         struct ldb_val iid;
1441         struct ldb_val usnv, local_usnv;
1442         struct ldb_val vers, flagsv;
1443         const struct ldb_val *old_addtime;
1444         uint32_t old_version;
1445         NTSTATUS status;
1446         int ret;
1447         const char *dnstring;
1448         char *vstring;
1449         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1450
1451         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1452         if (!tstring) {
1453                 return LDB_ERR_OPERATIONS_ERROR;
1454         }
1455         tval = data_blob_string_const(tstring);
1456
1457         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1458         if (!usn_string) {
1459                 return LDB_ERR_OPERATIONS_ERROR;
1460         }
1461         usnv = data_blob_string_const(usn_string);
1462
1463         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1464         if (!usn_string) {
1465                 return LDB_ERR_OPERATIONS_ERROR;
1466         }
1467         local_usnv = data_blob_string_const(usn_string);
1468
1469         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1470         if (!NT_STATUS_IS_OK(status)) {
1471                 return LDB_ERR_OPERATIONS_ERROR;
1472         }
1473
1474         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1475         if (!flags_string) {
1476                 return LDB_ERR_OPERATIONS_ERROR;
1477         }
1478         flagsv = data_blob_string_const(flags_string);
1479
1480         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1481         if (ret != LDB_SUCCESS) return ret;
1482
1483         /* get the ADDTIME from the original */
1484         old_addtime = ldb_dn_get_extended_component(old_dsdb_dn->dn, "RMD_ADDTIME");
1485         if (old_addtime == NULL) {
1486                 old_addtime = &tval;
1487         }
1488         if (dsdb_dn != old_dsdb_dn) {
1489                 ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", old_addtime);
1490                 if (ret != LDB_SUCCESS) return ret;
1491         }
1492
1493         /* use our invocation id */
1494         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1495         if (ret != LDB_SUCCESS) return ret;
1496
1497         /* changetime is the current time */
1498         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1499         if (ret != LDB_SUCCESS) return ret;
1500
1501         /* update the USN */
1502         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1503         if (ret != LDB_SUCCESS) return ret;
1504
1505         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1506         if (ret != LDB_SUCCESS) return ret;
1507
1508         /* increase the version by 1 */
1509         status = dsdb_get_extended_dn_uint32(old_dsdb_dn->dn, &old_version, "RMD_VERSION");
1510         if (NT_STATUS_IS_OK(status) && old_version >= version) {
1511                 version = old_version+1;
1512         }
1513         vstring = talloc_asprintf(dn, "%lu", (unsigned long)version);
1514         vers = data_blob_string_const(vstring);
1515         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1516         if (ret != LDB_SUCCESS) return ret;
1517
1518         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1519         if (dnstring == NULL) {
1520                 return LDB_ERR_OPERATIONS_ERROR;
1521         }
1522         *v = data_blob_string_const(dnstring);
1523
1524         return LDB_SUCCESS;
1525 }
1526
1527 /*
1528   handle adding a linked attribute
1529  */
1530 static int replmd_modify_la_add(struct ldb_module *module,
1531                                 struct dsdb_schema *schema,
1532                                 struct ldb_message *msg,
1533                                 struct ldb_message_element *el,
1534                                 struct ldb_message_element *old_el,
1535                                 const struct dsdb_attribute *schema_attr,
1536                                 uint64_t seq_num,
1537                                 time_t t,
1538                                 struct GUID *msg_guid)
1539 {
1540         unsigned int i;
1541         struct parsed_dn *dns, *old_dns;
1542         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1543         int ret;
1544         struct ldb_val *new_values = NULL;
1545         unsigned int num_new_values = 0;
1546         unsigned old_num_values = old_el?old_el->num_values:0;
1547         const struct GUID *invocation_id;
1548         struct ldb_context *ldb = ldb_module_get_ctx(module);
1549         NTTIME now;
1550
1551         unix_to_nt_time(&now, t);
1552
1553         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1554         if (ret != LDB_SUCCESS) {
1555                 talloc_free(tmp_ctx);
1556                 return ret;
1557         }
1558
1559         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1560         if (ret != LDB_SUCCESS) {
1561                 talloc_free(tmp_ctx);
1562                 return ret;
1563         }
1564
1565         invocation_id = samdb_ntds_invocation_id(ldb);
1566         if (!invocation_id) {
1567                 talloc_free(tmp_ctx);
1568                 return LDB_ERR_OPERATIONS_ERROR;
1569         }
1570
1571         ret = replmd_check_upgrade_links(old_dns, old_num_values, invocation_id);
1572         if (ret != LDB_SUCCESS) {
1573                 talloc_free(tmp_ctx);
1574                 return ret;
1575         }
1576
1577         /* for each new value, see if it exists already with the same GUID */
1578         for (i=0; i<el->num_values; i++) {
1579                 struct parsed_dn *p = parsed_dn_find(old_dns, old_num_values, dns[i].guid, NULL);
1580                 if (p == NULL) {
1581                         /* this is a new linked attribute value */
1582                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val, num_new_values+1);
1583                         if (new_values == NULL) {
1584                                 ldb_module_oom(module);
1585                                 talloc_free(tmp_ctx);
1586                                 return LDB_ERR_OPERATIONS_ERROR;
1587                         }
1588                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1589                                                   invocation_id, seq_num, seq_num, now, 0, false);
1590                         if (ret != LDB_SUCCESS) {
1591                                 talloc_free(tmp_ctx);
1592                                 return ret;
1593                         }
1594                         num_new_values++;
1595                 } else {
1596                         /* this is only allowed if the GUID was
1597                            previously deleted. */
1598                         uint32_t rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1599
1600                         if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
1601                                 ldb_asprintf_errstring(ldb, "Attribute %s already exists for target GUID %s",
1602                                                        el->name, GUID_string(tmp_ctx, p->guid));
1603                                 talloc_free(tmp_ctx);
1604                                 return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
1605                         }
1606                         ret = replmd_update_la_val(old_el->values, p->v, dns[i].dsdb_dn, p->dsdb_dn,
1607                                                    invocation_id, seq_num, seq_num, now, 0, false);
1608                         if (ret != LDB_SUCCESS) {
1609                                 talloc_free(tmp_ctx);
1610                                 return ret;
1611                         }
1612                 }
1613
1614                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, true);
1615                 if (ret != LDB_SUCCESS) {
1616                         talloc_free(tmp_ctx);
1617                         return ret;
1618                 }
1619         }
1620
1621         /* add the new ones on to the end of the old values, constructing a new el->values */
1622         el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1623                                     struct ldb_val,
1624                                     old_num_values+num_new_values);
1625         if (el->values == NULL) {
1626                 ldb_module_oom(module);
1627                 return LDB_ERR_OPERATIONS_ERROR;
1628         }
1629
1630         memcpy(&el->values[old_num_values], new_values, num_new_values*sizeof(struct ldb_val));
1631         el->num_values = old_num_values + num_new_values;
1632
1633         talloc_steal(msg->elements, el->values);
1634         talloc_steal(el->values, new_values);
1635
1636         talloc_free(tmp_ctx);
1637
1638         /* we now tell the backend to replace all existing values
1639            with the one we have constructed */
1640         el->flags = LDB_FLAG_MOD_REPLACE;
1641
1642         return LDB_SUCCESS;
1643 }
1644
1645
1646 /*
1647   handle deleting all active linked attributes
1648  */
1649 static int replmd_modify_la_delete(struct ldb_module *module,
1650                                    struct dsdb_schema *schema,
1651                                    struct ldb_message *msg,
1652                                    struct ldb_message_element *el,
1653                                    struct ldb_message_element *old_el,
1654                                    const struct dsdb_attribute *schema_attr,
1655                                    uint64_t seq_num,
1656                                    time_t t,
1657                                    struct GUID *msg_guid)
1658 {
1659         unsigned int i;
1660         struct parsed_dn *dns, *old_dns;
1661         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1662         int ret;
1663         const struct GUID *invocation_id;
1664         struct ldb_context *ldb = ldb_module_get_ctx(module);
1665         NTTIME now;
1666
1667         unix_to_nt_time(&now, t);
1668
1669         /* check if there is nothing to delete */
1670         if ((!old_el || old_el->num_values == 0) &&
1671             el->num_values == 0) {
1672                 return LDB_SUCCESS;
1673         }
1674
1675         if (!old_el || old_el->num_values == 0) {
1676                 return LDB_ERR_NO_SUCH_ATTRIBUTE;
1677         }
1678
1679         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1680         if (ret != LDB_SUCCESS) {
1681                 talloc_free(tmp_ctx);
1682                 return ret;
1683         }
1684
1685         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1686         if (ret != LDB_SUCCESS) {
1687                 talloc_free(tmp_ctx);
1688                 return ret;
1689         }
1690
1691         invocation_id = samdb_ntds_invocation_id(ldb);
1692         if (!invocation_id) {
1693                 return LDB_ERR_OPERATIONS_ERROR;
1694         }
1695
1696         ret = replmd_check_upgrade_links(old_dns, old_el->num_values, invocation_id);
1697         if (ret != LDB_SUCCESS) {
1698                 talloc_free(tmp_ctx);
1699                 return ret;
1700         }
1701
1702         el->values = NULL;
1703
1704         /* see if we are being asked to delete any links that
1705            don't exist or are already deleted */
1706         for (i=0; i<el->num_values; i++) {
1707                 struct parsed_dn *p = &dns[i];
1708                 struct parsed_dn *p2;
1709                 uint32_t rmd_flags;
1710
1711                 p2 = parsed_dn_find(old_dns, old_el->num_values, p->guid, NULL);
1712                 if (!p2) {
1713                         ldb_asprintf_errstring(ldb, "Attribute %s doesn't exist for target GUID %s",
1714                                                el->name, GUID_string(tmp_ctx, p->guid));
1715                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1716                 }
1717                 rmd_flags = dsdb_dn_rmd_flags(p2->dsdb_dn->dn);
1718                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) {
1719                         ldb_asprintf_errstring(ldb, "Attribute %s already deleted for target GUID %s",
1720                                                el->name, GUID_string(tmp_ctx, p->guid));
1721                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1722                 }
1723         }
1724
1725         /* for each new value, see if it exists already with the same GUID
1726            if it is not already deleted and matches the delete list then delete it
1727         */
1728         for (i=0; i<old_el->num_values; i++) {
1729                 struct parsed_dn *p = &old_dns[i];
1730                 uint32_t rmd_flags;
1731
1732                 if (el->num_values && parsed_dn_find(dns, el->num_values, p->guid, NULL) == NULL) {
1733                         continue;
1734                 }
1735
1736                 rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1737                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1738
1739                 ret = replmd_update_la_val(old_el->values, p->v, p->dsdb_dn, p->dsdb_dn,
1740                                            invocation_id, seq_num, seq_num, now, 0, true);
1741                 if (ret != LDB_SUCCESS) {
1742                         talloc_free(tmp_ctx);
1743                         return ret;
1744                 }
1745
1746                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, true);
1747                 if (ret != LDB_SUCCESS) {
1748                         talloc_free(tmp_ctx);
1749                         return ret;
1750                 }
1751         }
1752
1753         el->values = talloc_steal(msg->elements, old_el->values);
1754         el->num_values = old_el->num_values;
1755
1756         talloc_free(tmp_ctx);
1757
1758         /* we now tell the backend to replace all existing values
1759            with the one we have constructed */
1760         el->flags = LDB_FLAG_MOD_REPLACE;
1761
1762         return LDB_SUCCESS;
1763 }
1764
1765 /*
1766   handle replacing a linked attribute
1767  */
1768 static int replmd_modify_la_replace(struct ldb_module *module,
1769                                     struct dsdb_schema *schema,
1770                                     struct ldb_message *msg,
1771                                     struct ldb_message_element *el,
1772                                     struct ldb_message_element *old_el,
1773                                     const struct dsdb_attribute *schema_attr,
1774                                     uint64_t seq_num,
1775                                     time_t t,
1776                                     struct GUID *msg_guid)
1777 {
1778         unsigned int i;
1779         struct parsed_dn *dns, *old_dns;
1780         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1781         int ret;
1782         const struct GUID *invocation_id;
1783         struct ldb_context *ldb = ldb_module_get_ctx(module);
1784         struct ldb_val *new_values = NULL;
1785         unsigned int num_new_values = 0;
1786         unsigned int old_num_values = old_el?old_el->num_values:0;
1787         NTTIME now;
1788
1789         unix_to_nt_time(&now, t);
1790
1791         /* check if there is nothing to replace */
1792         if ((!old_el || old_el->num_values == 0) &&
1793             el->num_values == 0) {
1794                 return LDB_SUCCESS;
1795         }
1796
1797         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1798         if (ret != LDB_SUCCESS) {
1799                 talloc_free(tmp_ctx);
1800                 return ret;
1801         }
1802
1803         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1804         if (ret != LDB_SUCCESS) {
1805                 talloc_free(tmp_ctx);
1806                 return ret;
1807         }
1808
1809         invocation_id = samdb_ntds_invocation_id(ldb);
1810         if (!invocation_id) {
1811                 return LDB_ERR_OPERATIONS_ERROR;
1812         }
1813
1814         ret = replmd_check_upgrade_links(old_dns, old_num_values, invocation_id);
1815         if (ret != LDB_SUCCESS) {
1816                 talloc_free(tmp_ctx);
1817                 return ret;
1818         }
1819
1820         /* mark all the old ones as deleted */
1821         for (i=0; i<old_num_values; i++) {
1822                 struct parsed_dn *old_p = &old_dns[i];
1823                 struct parsed_dn *p;
1824                 uint32_t rmd_flags = dsdb_dn_rmd_flags(old_p->dsdb_dn->dn);
1825
1826                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1827
1828                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, false);
1829                 if (ret != LDB_SUCCESS) {
1830                         talloc_free(tmp_ctx);
1831                         return ret;
1832                 }
1833
1834                 p = parsed_dn_find(dns, el->num_values, old_p->guid, NULL);
1835                 if (p) {
1836                         /* we don't delete it if we are re-adding it */
1837                         continue;
1838                 }
1839
1840                 ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn, old_p->dsdb_dn,
1841                                            invocation_id, seq_num, seq_num, now, 0, true);
1842                 if (ret != LDB_SUCCESS) {
1843                         talloc_free(tmp_ctx);
1844                         return ret;
1845                 }
1846         }
1847
1848         /* for each new value, either update its meta-data, or add it
1849          * to old_el
1850         */
1851         for (i=0; i<el->num_values; i++) {
1852                 struct parsed_dn *p = &dns[i], *old_p;
1853
1854                 if (old_dns &&
1855                     (old_p = parsed_dn_find(old_dns,
1856                                             old_num_values, p->guid, NULL)) != NULL) {
1857                         /* update in place */
1858                         ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn,
1859                                                    old_p->dsdb_dn, invocation_id,
1860                                                    seq_num, seq_num, now, 0, false);
1861                         if (ret != LDB_SUCCESS) {
1862                                 talloc_free(tmp_ctx);
1863                                 return ret;
1864                         }
1865                 } else {
1866                         /* add a new one */
1867                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val,
1868                                                     num_new_values+1);
1869                         if (new_values == NULL) {
1870                                 ldb_module_oom(module);
1871                                 talloc_free(tmp_ctx);
1872                                 return LDB_ERR_OPERATIONS_ERROR;
1873                         }
1874                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1875                                                   invocation_id, seq_num, seq_num, now, 0, false);
1876                         if (ret != LDB_SUCCESS) {
1877                                 talloc_free(tmp_ctx);
1878                                 return ret;
1879                         }
1880                         num_new_values++;
1881                 }
1882
1883                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, false);
1884                 if (ret != LDB_SUCCESS) {
1885                         talloc_free(tmp_ctx);
1886                         return ret;
1887                 }
1888         }
1889
1890         /* add the new values to the end of old_el */
1891         if (num_new_values != 0) {
1892                 el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1893                                             struct ldb_val, old_num_values+num_new_values);
1894                 if (el->values == NULL) {
1895                         ldb_module_oom(module);
1896                         return LDB_ERR_OPERATIONS_ERROR;
1897                 }
1898                 memcpy(&el->values[old_num_values], &new_values[0],
1899                        sizeof(struct ldb_val)*num_new_values);
1900                 el->num_values = old_num_values + num_new_values;
1901                 talloc_steal(msg->elements, new_values);
1902         } else {
1903                 el->values = old_el->values;
1904                 el->num_values = old_el->num_values;
1905                 talloc_steal(msg->elements, el->values);
1906         }
1907
1908         talloc_free(tmp_ctx);
1909
1910         /* we now tell the backend to replace all existing values
1911            with the one we have constructed */
1912         el->flags = LDB_FLAG_MOD_REPLACE;
1913
1914         return LDB_SUCCESS;
1915 }
1916
1917
1918 /*
1919   handle linked attributes in modify requests
1920  */
1921 static int replmd_modify_handle_linked_attribs(struct ldb_module *module,
1922                                                struct ldb_message *msg,
1923                                                uint64_t seq_num, time_t t)
1924 {
1925         struct ldb_result *res;
1926         unsigned int i;
1927         int ret;
1928         struct ldb_context *ldb = ldb_module_get_ctx(module);
1929         struct ldb_message *old_msg;
1930         struct dsdb_schema *schema = dsdb_get_schema(ldb);
1931         struct GUID old_guid;
1932
1933         if (seq_num == 0) {
1934                 /* there the replmd_update_rpmd code has already
1935                  * checked and saw that there are no linked
1936                  * attributes */
1937                 return LDB_SUCCESS;
1938         }
1939
1940 #if !W2K3_LINKED_ATTRIBUTES
1941         return LDB_SUCCESS;
1942 #endif
1943
1944         if (dsdb_functional_level(ldb) == DS_DOMAIN_FUNCTION_2000) {
1945                 /* don't do anything special for linked attributes */
1946                 return LDB_SUCCESS;
1947         }
1948
1949         ret = dsdb_module_search_dn(module, msg, &res, msg->dn, NULL,
1950                                     DSDB_SEARCH_SHOW_DELETED |
1951                                     DSDB_SEARCH_REVEAL_INTERNALS |
1952                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
1953         if (ret != LDB_SUCCESS) {
1954                 return ret;
1955         }
1956         old_msg = res->msgs[0];
1957
1958         old_guid = samdb_result_guid(old_msg, "objectGUID");
1959
1960         for (i=0; i<msg->num_elements; i++) {
1961                 struct ldb_message_element *el = &msg->elements[i];
1962                 struct ldb_message_element *old_el, *new_el;
1963                 const struct dsdb_attribute *schema_attr
1964                         = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
1965                 if (!schema_attr) {
1966                         ldb_asprintf_errstring(ldb,
1967                                                "attribute %s is not a valid attribute in schema", el->name);
1968                         return LDB_ERR_OBJECT_CLASS_VIOLATION;
1969                 }
1970                 if (schema_attr->linkID == 0) {
1971                         continue;
1972                 }
1973                 if ((schema_attr->linkID & 1) == 1) {
1974                         /* Odd is for the target.  Illegal to modify */
1975                         ldb_asprintf_errstring(ldb,
1976                                                "attribute %s must not be modified directly, it is a linked attribute", el->name);
1977                         return LDB_ERR_UNWILLING_TO_PERFORM;
1978                 }
1979                 old_el = ldb_msg_find_element(old_msg, el->name);
1980                 switch (el->flags & LDB_FLAG_MOD_MASK) {
1981                 case LDB_FLAG_MOD_REPLACE:
1982                         ret = replmd_modify_la_replace(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
1983                         break;
1984                 case LDB_FLAG_MOD_DELETE:
1985                         ret = replmd_modify_la_delete(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
1986                         break;
1987                 case LDB_FLAG_MOD_ADD:
1988                         ret = replmd_modify_la_add(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
1989                         break;
1990                 default:
1991                         ldb_asprintf_errstring(ldb,
1992                                                "invalid flags 0x%x for %s linked attribute",
1993                                                el->flags, el->name);
1994                         return LDB_ERR_UNWILLING_TO_PERFORM;
1995                 }
1996                 if (ret != LDB_SUCCESS) {
1997                         return ret;
1998                 }
1999                 if (old_el) {
2000                         ldb_msg_remove_attr(old_msg, el->name);
2001                 }
2002                 ldb_msg_add_empty(old_msg, el->name, 0, &new_el);
2003                 new_el->num_values = el->num_values;
2004                 new_el->values = talloc_steal(msg->elements, el->values);
2005
2006                 /* TODO: this relises a bit too heavily on the exact
2007                    behaviour of ldb_msg_find_element and
2008                    ldb_msg_remove_element */
2009                 old_el = ldb_msg_find_element(msg, el->name);
2010                 if (old_el != el) {
2011                         ldb_msg_remove_element(msg, old_el);
2012                         i--;
2013                 }
2014         }
2015
2016         talloc_free(res);
2017         return ret;
2018 }
2019
2020
2021
2022 static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
2023 {
2024         struct ldb_context *ldb;
2025         struct replmd_replicated_request *ac;
2026         struct ldb_request *down_req;
2027         struct ldb_message *msg;
2028         time_t t = time(NULL);
2029         int ret;
2030         bool is_urgent = false;
2031
2032         /* do not manipulate our control entries */
2033         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2034                 return ldb_next_request(module, req);
2035         }
2036
2037         ldb = ldb_module_get_ctx(module);
2038
2039         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_modify\n");
2040
2041         ac = replmd_ctx_init(module, req);
2042         if (!ac) {
2043                 return LDB_ERR_OPERATIONS_ERROR;
2044         }
2045
2046         /* we have to copy the message as the caller might have it as a const */
2047         msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
2048         if (msg == NULL) {
2049                 ldb_oom(ldb);
2050                 talloc_free(ac);
2051                 return LDB_ERR_OPERATIONS_ERROR;
2052         }
2053
2054         ldb_msg_remove_attr(msg, "whenChanged");
2055         ldb_msg_remove_attr(msg, "uSNChanged");
2056
2057         ret = replmd_update_rpmd(module, ac->schema, msg, &ac->seq_num, t, &is_urgent);
2058         if (ret != LDB_SUCCESS) {
2059                 talloc_free(ac);
2060                 return ret;
2061         }
2062
2063         ret = replmd_modify_handle_linked_attribs(module, msg, ac->seq_num, t);
2064         if (ret != LDB_SUCCESS) {
2065                 talloc_free(ac);
2066                 return ret;
2067         }
2068
2069         /* TODO:
2070          * - replace the old object with the newly constructed one
2071          */
2072
2073         ac->is_urgent = is_urgent;
2074
2075         ret = ldb_build_mod_req(&down_req, ldb, ac,
2076                                 msg,
2077                                 req->controls,
2078                                 ac, replmd_op_callback,
2079                                 req);
2080         if (ret != LDB_SUCCESS) {
2081                 talloc_free(ac);
2082                 return ret;
2083         }
2084         talloc_steal(down_req, msg);
2085
2086         /* we only change whenChanged and uSNChanged if the seq_num
2087            has changed */
2088         if (ac->seq_num != 0) {
2089                 if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
2090                         talloc_free(ac);
2091                         return ret;
2092                 }
2093
2094                 if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
2095                         talloc_free(ac);
2096                         return ret;
2097                 }
2098         }
2099
2100         /* go on with the call chain */
2101         return ldb_next_request(module, down_req);
2102 }
2103
2104 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares);
2105
2106 /*
2107   handle a rename request
2108
2109   On a rename we need to do an extra ldb_modify which sets the
2110   whenChanged and uSNChanged attributes.  We do this in a callback after the success.
2111  */
2112 static int replmd_rename(struct ldb_module *module, struct ldb_request *req)
2113 {
2114         struct ldb_context *ldb;
2115         struct replmd_replicated_request *ac;
2116         int ret;
2117         struct ldb_request *down_req;
2118
2119         /* do not manipulate our control entries */
2120         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2121                 return ldb_next_request(module, req);
2122         }
2123
2124         ldb = ldb_module_get_ctx(module);
2125
2126         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_rename\n");
2127
2128         ac = replmd_ctx_init(module, req);
2129         if (!ac) {
2130                 return LDB_ERR_OPERATIONS_ERROR;
2131         }
2132         ret = ldb_build_rename_req(&down_req, ldb, ac,
2133                                    ac->req->op.rename.olddn,
2134                                    ac->req->op.rename.newdn,
2135                                    ac->req->controls,
2136                                    ac, replmd_rename_callback,
2137                                    ac->req);
2138
2139         if (ret != LDB_SUCCESS) {
2140                 talloc_free(ac);
2141                 return ret;
2142         }
2143
2144         /* go on with the call chain */
2145         return ldb_next_request(module, down_req);
2146 }
2147
2148 /* After the rename is compleated, update the whenchanged etc */
2149 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares)
2150 {
2151         struct ldb_context *ldb;
2152         struct replmd_replicated_request *ac;
2153         struct ldb_request *down_req;
2154         struct ldb_message *msg;
2155         time_t t = time(NULL);
2156         int ret;
2157
2158         ac = talloc_get_type(req->context, struct replmd_replicated_request);
2159         ldb = ldb_module_get_ctx(ac->module);
2160
2161         if (ares->error != LDB_SUCCESS) {
2162                 return ldb_module_done(ac->req, ares->controls,
2163                                         ares->response, ares->error);
2164         }
2165
2166         if (ares->type != LDB_REPLY_DONE) {
2167                 ldb_set_errstring(ldb,
2168                                   "invalid ldb_reply_type in callback");
2169                 talloc_free(ares);
2170                 return ldb_module_done(ac->req, NULL, NULL,
2171                                         LDB_ERR_OPERATIONS_ERROR);
2172         }
2173
2174         /* Get a sequence number from the backend */
2175         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
2176         if (ret != LDB_SUCCESS) {
2177                 return ret;
2178         }
2179
2180         /* TODO:
2181          * - replace the old object with the newly constructed one
2182          */
2183
2184         msg = ldb_msg_new(ac);
2185         if (msg == NULL) {
2186                 ldb_oom(ldb);
2187                 return LDB_ERR_OPERATIONS_ERROR;
2188         }
2189
2190         msg->dn = ac->req->op.rename.newdn;
2191
2192         ret = ldb_build_mod_req(&down_req, ldb, ac,
2193                                 msg,
2194                                 req->controls,
2195                                 ac, replmd_op_callback,
2196                                 req);
2197
2198         if (ret != LDB_SUCCESS) {
2199                 talloc_free(ac);
2200                 return ret;
2201         }
2202         talloc_steal(down_req, msg);
2203
2204         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
2205                 talloc_free(ac);
2206                 return ret;
2207         }
2208         
2209         if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
2210                 talloc_free(ac);
2211                 return ret;
2212         }
2213
2214         /* go on with the call chain - do the modify after the rename */
2215         return ldb_next_request(ac->module, down_req);
2216 }
2217
2218 /*
2219    remove links from objects that point at this object when an object
2220    is deleted
2221  */
2222 static int replmd_delete_remove_link(struct ldb_module *module,
2223                                      struct dsdb_schema *schema,
2224                                      struct ldb_dn *dn,
2225                                      struct ldb_message_element *el,
2226                                      const struct dsdb_attribute *sa)
2227 {
2228         unsigned int i;
2229         TALLOC_CTX *tmp_ctx = talloc_new(module);
2230         struct ldb_context *ldb = ldb_module_get_ctx(module);
2231
2232         for (i=0; i<el->num_values; i++) {
2233                 struct dsdb_dn *dsdb_dn;
2234                 NTSTATUS status;
2235                 int ret;
2236                 struct GUID guid2;
2237                 struct ldb_message *msg;
2238                 const struct dsdb_attribute *target_attr;
2239                 struct ldb_message_element *el2;
2240                 struct ldb_val dn_val;
2241
2242                 if (dsdb_dn_is_deleted_val(&el->values[i])) {
2243                         continue;
2244                 }
2245
2246                 dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &el->values[i], sa->syntax->ldap_oid);
2247                 if (!dsdb_dn) {
2248                         talloc_free(tmp_ctx);
2249                         return LDB_ERR_OPERATIONS_ERROR;
2250                 }
2251
2252                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid2, "GUID");
2253                 if (!NT_STATUS_IS_OK(status)) {
2254                         talloc_free(tmp_ctx);
2255                         return LDB_ERR_OPERATIONS_ERROR;
2256                 }
2257
2258                 /* remove the link */
2259                 msg = ldb_msg_new(tmp_ctx);
2260                 if (!msg) {
2261                         ldb_module_oom(module);
2262                         talloc_free(tmp_ctx);
2263                         return LDB_ERR_OPERATIONS_ERROR;
2264                 }
2265
2266
2267                 msg->dn = dsdb_dn->dn;
2268
2269                 target_attr = dsdb_attribute_by_linkID(schema, sa->linkID ^ 1);
2270                 if (target_attr == NULL) {
2271                         continue;
2272                 }
2273
2274                 ret = ldb_msg_add_empty(msg, target_attr->lDAPDisplayName, LDB_FLAG_MOD_DELETE, &el2);
2275                 if (ret != LDB_SUCCESS) {
2276                         ldb_module_oom(module);
2277                         talloc_free(tmp_ctx);
2278                         return LDB_ERR_OPERATIONS_ERROR;
2279                 }
2280                 dn_val = data_blob_string_const(ldb_dn_get_linearized(dn));
2281                 el2->values = &dn_val;
2282                 el2->num_values = 1;
2283
2284                 ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE);
2285                 if (ret != LDB_SUCCESS) {
2286                         talloc_free(tmp_ctx);
2287                         return ret;
2288                 }
2289         }
2290         talloc_free(tmp_ctx);
2291         return LDB_SUCCESS;
2292 }
2293
2294
2295 /*
2296   handle update of replication meta data for deletion of objects
2297
2298   This also handles the mapping of delete to a rename operation
2299   to allow deletes to be replicated.
2300  */
2301 static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
2302 {
2303         int ret = LDB_ERR_OTHER;
2304         bool retb;
2305         struct ldb_dn *old_dn, *new_dn;
2306         const char *rdn_name;
2307         const struct ldb_val *rdn_value, *new_rdn_value;
2308         struct GUID guid;
2309         struct ldb_context *ldb = ldb_module_get_ctx(module);
2310         struct dsdb_schema *schema = dsdb_get_schema(ldb);
2311         struct ldb_message *msg, *old_msg;
2312         struct ldb_message_element *el;
2313         TALLOC_CTX *tmp_ctx;
2314         struct ldb_result *res, *parent_res;
2315         const char *preserved_attrs[] = {
2316                 /* yes, this really is a hard coded list. See MS-ADTS
2317                    section 3.1.1.5.5.1.1 */
2318                 "nTSecurityDescriptor", "attributeID", "attributeSyntax", "dNReferenceUpdate", "dNSHostName",
2319                 "flatName", "governsID", "groupType", "instanceType", "lDAPDisplayName", "legacyExchangeDN",
2320                 "isDeleted", "isRecycled", "lastKnownParent", "msDS-LastKnownRDN", "mS-DS-CreatorSID",
2321                 "mSMQOwnerID", "nCName", "objectClass", "distinguishedName", "objectGUID", "objectSid",
2322                 "oMSyntax", "proxiedObjectName", "name", "replPropertyMetaData", "sAMAccountName",
2323                 "securityIdentifier", "sIDHistory", "subClassOf", "systemFlags", "trustPartner", "trustDirection",
2324                 "trustType", "trustAttributes", "userAccountControl", "uSNChanged", "uSNCreated", "whenCreated",
2325                 "whenChanged", NULL};
2326         unsigned int i, el_count = 0;
2327
2328         if (ldb_dn_is_special(req->op.del.dn)) {
2329                 return ldb_next_request(module, req);
2330         }
2331
2332         tmp_ctx = talloc_new(ldb);
2333
2334         old_dn = ldb_dn_copy(tmp_ctx, req->op.del.dn);
2335
2336         /* we need the complete msg off disk, so we can work out which
2337            attributes need to be removed */
2338         ret = dsdb_module_search_dn(module, tmp_ctx, &res, old_dn, NULL,
2339                                     DSDB_SEARCH_SHOW_DELETED |
2340                                     DSDB_SEARCH_REVEAL_INTERNALS |
2341                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
2342         if (ret != LDB_SUCCESS) {
2343                 talloc_free(tmp_ctx);
2344                 return ret;
2345         }
2346         old_msg = res->msgs[0];
2347
2348         if (ldb_msg_check_string_attribute(old_msg, "isDeleted", "TRUE")) {
2349                 struct auth_session_info *session_info =
2350                         (struct auth_session_info *)ldb_get_opaque(ldb, "sessionInfo");
2351                 if (security_session_user_level(session_info) != SECURITY_SYSTEM) {
2352                         ldb_asprintf_errstring(ldb, "Refusing to delete deleted object %s",
2353                                                ldb_dn_get_linearized(old_msg->dn));
2354                         return LDB_ERR_UNWILLING_TO_PERFORM;
2355                 }
2356
2357                 /* it is already deleted - really remove it this time */
2358                 talloc_free(tmp_ctx);
2359                 return ldb_next_request(module, req);
2360         }
2361
2362         /* work out where we will be renaming this object to */
2363         ret = dsdb_get_deleted_objects_dn(ldb, tmp_ctx, old_dn, &new_dn);
2364         if (ret != LDB_SUCCESS) {
2365                 /* this is probably an attempted delete on a partition
2366                  * that doesn't allow delete operations, such as the
2367                  * schema partition */
2368                 ldb_asprintf_errstring(ldb, "No Deleted Objects container for DN %s",
2369                                        ldb_dn_get_linearized(old_dn));
2370                 talloc_free(tmp_ctx);
2371                 return LDB_ERR_UNWILLING_TO_PERFORM;
2372         }
2373
2374         rdn_name = ldb_dn_get_rdn_name(old_dn);
2375         rdn_value = ldb_dn_get_rdn_val(old_dn);
2376
2377         /* get the objects GUID from the search we just did */
2378         guid = samdb_result_guid(old_msg, "objectGUID");
2379
2380         /* Add a formatted child */
2381         retb = ldb_dn_add_child_fmt(new_dn, "%s=%s\\0ADEL:%s",
2382                                     rdn_name,
2383                                     rdn_value->data,
2384                                     GUID_string(tmp_ctx, &guid));
2385         if (!retb) {
2386                 DEBUG(0,(__location__ ": Unable to add a formatted child to dn: %s",
2387                                 ldb_dn_get_linearized(new_dn)));
2388                 talloc_free(tmp_ctx);
2389                 return LDB_ERR_OPERATIONS_ERROR;
2390         }
2391
2392         /*
2393           now we need to modify the object in the following ways:
2394
2395           - add isDeleted=TRUE
2396           - update rDN and name, with new rDN
2397           - remove linked attributes
2398           - remove objectCategory and sAMAccountType
2399           - remove attribs not on the preserved list
2400              - preserved if in above list, or is rDN
2401           - remove all linked attribs from this object
2402           - remove all links from other objects to this object
2403           - add lastKnownParent
2404           - update replPropertyMetaData?
2405
2406           see MS-ADTS "Tombstone Requirements" section 3.1.1.5.5.1.1
2407          */
2408
2409         msg = ldb_msg_new(tmp_ctx);
2410         if (msg == NULL) {
2411                 ldb_module_oom(module);
2412                 talloc_free(tmp_ctx);
2413                 return LDB_ERR_OPERATIONS_ERROR;
2414         }
2415
2416         msg->dn = old_dn;
2417
2418         ret = ldb_msg_add_string(msg, "isDeleted", "TRUE");
2419         if (ret != LDB_SUCCESS) {
2420                 DEBUG(0,(__location__ ": Failed to add isDeleted string to the msg\n"));
2421                 ldb_module_oom(module);
2422                 talloc_free(tmp_ctx);
2423                 return ret;
2424         }
2425         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2426
2427         /* we also mark it as recycled, meaning this object can't be
2428            recovered (we are stripping its attributes) */
2429         if (dsdb_functional_level(ldb) >= DS_DOMAIN_FUNCTION_2008_R2) {
2430                 ret = ldb_msg_add_string(msg, "isRecycled", "TRUE");
2431                 if (ret != LDB_SUCCESS) {
2432                         DEBUG(0,(__location__ ": Failed to add isRecycled string to the msg\n"));
2433                         ldb_module_oom(module);
2434                         talloc_free(tmp_ctx);
2435                         return ret;
2436                 }
2437                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2438         }
2439
2440         /* we need the storage form of the parent GUID */
2441         ret = dsdb_module_search_dn(module, tmp_ctx, &parent_res,
2442                                     ldb_dn_get_parent(tmp_ctx, old_dn), NULL,
2443                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
2444                                     DSDB_SEARCH_REVEAL_INTERNALS);
2445         if (ret != LDB_SUCCESS) {
2446                 talloc_free(tmp_ctx);
2447                 return ret;
2448         }
2449
2450         ret = ldb_msg_add_steal_string(msg, "lastKnownParent",
2451                                        ldb_dn_get_extended_linearized(tmp_ctx, parent_res->msgs[0]->dn, 1));
2452         if (ret != LDB_SUCCESS) {
2453                 DEBUG(0,(__location__ ": Failed to add lastKnownParent string to the msg\n"));
2454                 ldb_module_oom(module);
2455                 talloc_free(tmp_ctx);
2456                 return ret;
2457         }
2458         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2459
2460         /* work out which of the old attributes we will be removing */
2461         for (i=0; i<old_msg->num_elements; i++) {
2462                 const struct dsdb_attribute *sa;
2463                 el = &old_msg->elements[i];
2464                 sa = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
2465                 if (!sa) {
2466                         talloc_free(tmp_ctx);
2467                         return LDB_ERR_OPERATIONS_ERROR;
2468                 }
2469                 if (ldb_attr_cmp(el->name, rdn_name) == 0) {
2470                         /* don't remove the rDN */
2471                         continue;
2472                 }
2473
2474                 if (sa->linkID && sa->linkID & 1) {
2475                         ret = replmd_delete_remove_link(module, schema, old_dn, el, sa);
2476                         if (ret != LDB_SUCCESS) {
2477                                 talloc_free(tmp_ctx);
2478                                 return LDB_ERR_OPERATIONS_ERROR;
2479                         }
2480                         continue;
2481                 }
2482
2483                 if (!sa->linkID && ldb_attr_in_list(preserved_attrs, el->name)) {
2484                         continue;
2485                 }
2486
2487                 ret = ldb_msg_add_empty(msg, el->name, LDB_FLAG_MOD_DELETE, &el);
2488                 if (ret != LDB_SUCCESS) {
2489                         talloc_free(tmp_ctx);
2490                         ldb_module_oom(module);
2491                         return ret;
2492                 }
2493         }
2494
2495         /* work out what the new rdn value is, for updating the
2496            rDN and name fields */
2497         new_rdn_value = ldb_dn_get_rdn_val(new_dn);
2498         ret = ldb_msg_add_value(msg, rdn_name, new_rdn_value, &el);
2499         if (ret != LDB_SUCCESS) {
2500                 talloc_free(tmp_ctx);
2501                 return ret;
2502         }
2503         el->flags = LDB_FLAG_MOD_REPLACE;
2504
2505         el = ldb_msg_find_element(old_msg, "name");
2506         if (el) {
2507                 ret = ldb_msg_add_value(msg, "name", new_rdn_value, &el);
2508                 if (ret != LDB_SUCCESS) {
2509                         talloc_free(tmp_ctx);
2510                         return ret;
2511                 }
2512                 el->flags = LDB_FLAG_MOD_REPLACE;
2513         }
2514
2515         ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE);
2516         if (ret != LDB_SUCCESS) {
2517                 ldb_asprintf_errstring(ldb, "replmd_delete: Failed to modify object %s in delete - %s",
2518                                        ldb_dn_get_linearized(old_dn), ldb_errstring(ldb));
2519                 talloc_free(tmp_ctx);
2520                 return ret;
2521         }
2522
2523         /* now rename onto the new DN */
2524         ret = dsdb_module_rename(module, old_dn, new_dn, 0);
2525         if (ret != LDB_SUCCESS){
2526                 DEBUG(0,(__location__ ": Failed to rename object from '%s' to '%s' - %s\n",
2527                          ldb_dn_get_linearized(old_dn),
2528                          ldb_dn_get_linearized(new_dn),
2529                          ldb_errstring(ldb)));
2530                 talloc_free(tmp_ctx);
2531                 return ret;
2532         }
2533
2534         talloc_free(tmp_ctx);
2535
2536         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
2537 }
2538
2539
2540
2541 static int replmd_replicated_request_error(struct replmd_replicated_request *ar, int ret)
2542 {
2543         return ret;
2544 }
2545
2546 static int replmd_replicated_request_werror(struct replmd_replicated_request *ar, WERROR status)
2547 {
2548         int ret = LDB_ERR_OTHER;
2549         /* TODO: do some error mapping */
2550         return ret;
2551 }
2552
2553 static int replmd_replicated_apply_add(struct replmd_replicated_request *ar)
2554 {
2555         struct ldb_context *ldb;
2556         struct ldb_request *change_req;
2557         enum ndr_err_code ndr_err;
2558         struct ldb_message *msg;
2559         struct replPropertyMetaDataBlob *md;
2560         struct ldb_val md_value;
2561         unsigned int i;
2562         int ret;
2563
2564         /*
2565          * TODO: check if the parent object exist
2566          */
2567
2568         /*
2569          * TODO: handle the conflict case where an object with the
2570          *       same name exist
2571          */
2572
2573         ldb = ldb_module_get_ctx(ar->module);
2574         msg = ar->objs->objects[ar->index_current].msg;
2575         md = ar->objs->objects[ar->index_current].meta_data;
2576
2577         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2578         if (ret != LDB_SUCCESS) {
2579                 return replmd_replicated_request_error(ar, ret);
2580         }
2581
2582         ret = ldb_msg_add_value(msg, "objectGUID", &ar->objs->objects[ar->index_current].guid_value, NULL);
2583         if (ret != LDB_SUCCESS) {
2584                 return replmd_replicated_request_error(ar, ret);
2585         }
2586
2587         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2588         if (ret != LDB_SUCCESS) {
2589                 return replmd_replicated_request_error(ar, ret);
2590         }
2591
2592         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ar->seq_num);
2593         if (ret != LDB_SUCCESS) {
2594                 return replmd_replicated_request_error(ar, ret);
2595         }
2596
2597         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2598         if (ret != LDB_SUCCESS) {
2599                 return replmd_replicated_request_error(ar, ret);
2600         }
2601
2602         /* remove any message elements that have zero values */
2603         for (i=0; i<msg->num_elements; i++) {
2604                 struct ldb_message_element *el = &msg->elements[i];
2605
2606                 if (el->num_values == 0) {
2607                         DEBUG(4,(__location__ ": Removing attribute %s with num_values==0\n",
2608                                  el->name));
2609                         memmove(el, el+1, sizeof(*el)*(msg->num_elements - (i+1)));
2610                         msg->num_elements--;
2611                         i--;
2612                         continue;
2613                 }
2614         }
2615         
2616         /*
2617          * the meta data array is already sorted by the caller
2618          */
2619         for (i=0; i < md->ctr.ctr1.count; i++) {
2620                 md->ctr.ctr1.array[i].local_usn = ar->seq_num;
2621         }
2622         ndr_err = ndr_push_struct_blob(&md_value, msg, 
2623                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
2624                                        md,
2625                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2626         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2627                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2628                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2629         }
2630         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &md_value, NULL);
2631         if (ret != LDB_SUCCESS) {
2632                 return replmd_replicated_request_error(ar, ret);
2633         }
2634
2635         replmd_ldb_message_sort(msg, ar->schema);
2636
2637         if (DEBUGLVL(4)) {
2638                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_ADD, msg);
2639                 DEBUG(4, ("DRS replication add message:\n%s\n", s));
2640                 talloc_free(s);
2641         }
2642
2643         ret = ldb_build_add_req(&change_req,
2644                                 ldb,
2645                                 ar,
2646                                 msg,
2647                                 ar->controls,
2648                                 ar,
2649                                 replmd_op_callback,
2650                                 ar->req);
2651         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2652
2653         return ldb_next_request(ar->module, change_req);
2654 }
2655
2656 /*
2657    return true if an update is newer than an existing entry
2658    see section 5.11 of MS-ADTS
2659 */
2660 static bool replmd_update_is_newer(const struct GUID *current_invocation_id,
2661                                    const struct GUID *update_invocation_id,
2662                                    uint32_t current_version,
2663                                    uint32_t update_version,
2664                                    NTTIME current_change_time,
2665                                    NTTIME update_change_time)
2666 {
2667         if (update_version != current_version) {
2668                 return update_version > current_version;
2669         }
2670         if (update_change_time > current_change_time) {
2671                 return true;
2672         }
2673         if (update_change_time == current_change_time) {
2674                 return GUID_compare(update_invocation_id, current_invocation_id) > 0;
2675         }
2676         return false;
2677 }
2678
2679 static bool replmd_replPropertyMetaData1_is_newer(struct replPropertyMetaData1 *cur_m,
2680                                                   struct replPropertyMetaData1 *new_m)
2681 {
2682         return replmd_update_is_newer(&cur_m->originating_invocation_id,
2683                                       &new_m->originating_invocation_id,
2684                                       cur_m->version,
2685                                       new_m->version,
2686                                       cur_m->originating_change_time,
2687                                       new_m->originating_change_time);
2688 }
2689
2690 static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
2691 {
2692         struct ldb_context *ldb;
2693         struct ldb_request *change_req;
2694         enum ndr_err_code ndr_err;
2695         struct ldb_message *msg;
2696         struct replPropertyMetaDataBlob *rmd;
2697         struct replPropertyMetaDataBlob omd;
2698         const struct ldb_val *omd_value;
2699         struct replPropertyMetaDataBlob nmd;
2700         struct ldb_val nmd_value;
2701         unsigned int i;
2702         uint32_t j,ni=0;
2703         unsigned int removed_attrs = 0;
2704         int ret;
2705
2706         ldb = ldb_module_get_ctx(ar->module);
2707         msg = ar->objs->objects[ar->index_current].msg;
2708         rmd = ar->objs->objects[ar->index_current].meta_data;
2709         ZERO_STRUCT(omd);
2710         omd.version = 1;
2711
2712         /*
2713          * TODO: check repl data is correct after a rename
2714          */
2715         if (ldb_dn_compare(msg->dn, ar->search_msg->dn) != 0) {
2716                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_request rename %s => %s\n",
2717                           ldb_dn_get_linearized(ar->search_msg->dn),
2718                           ldb_dn_get_linearized(msg->dn));
2719                 if (dsdb_module_rename(ar->module,
2720                                        ar->search_msg->dn, msg->dn,
2721                                        DSDB_FLAG_OWN_MODULE) != LDB_SUCCESS) {
2722                         ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_replicated_request rename %s => %s failed - %s\n",
2723                                   ldb_dn_get_linearized(ar->search_msg->dn),
2724                                   ldb_dn_get_linearized(msg->dn),
2725                                   ldb_errstring(ldb));
2726                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_DB_ERROR);
2727                 }
2728         }
2729
2730         /* find existing meta data */
2731         omd_value = ldb_msg_find_ldb_val(ar->search_msg, "replPropertyMetaData");
2732         if (omd_value) {
2733                 ndr_err = ndr_pull_struct_blob(omd_value, ar,
2734                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &omd,
2735                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
2736                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2737                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2738                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2739                 }
2740
2741                 if (omd.version != 1) {
2742                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
2743                 }
2744         }
2745
2746         ZERO_STRUCT(nmd);
2747         nmd.version = 1;
2748         nmd.ctr.ctr1.count = omd.ctr.ctr1.count + rmd->ctr.ctr1.count;
2749         nmd.ctr.ctr1.array = talloc_array(ar,
2750                                           struct replPropertyMetaData1,
2751                                           nmd.ctr.ctr1.count);
2752         if (!nmd.ctr.ctr1.array) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2753
2754         /* first copy the old meta data */
2755         for (i=0; i < omd.ctr.ctr1.count; i++) {
2756                 nmd.ctr.ctr1.array[ni]  = omd.ctr.ctr1.array[i];
2757                 ni++;
2758         }
2759
2760         /* now merge in the new meta data */
2761         for (i=0; i < rmd->ctr.ctr1.count; i++) {
2762                 bool found = false;
2763
2764                 for (j=0; j < ni; j++) {
2765                         bool cmp;
2766
2767                         if (rmd->ctr.ctr1.array[i].attid != nmd.ctr.ctr1.array[j].attid) {
2768                                 continue;
2769                         }
2770
2771                         cmp = replmd_replPropertyMetaData1_is_newer(&nmd.ctr.ctr1.array[j],
2772                                                                     &rmd->ctr.ctr1.array[i]);
2773                         if (cmp) {
2774                                 /* replace the entry */
2775                                 nmd.ctr.ctr1.array[j] = rmd->ctr.ctr1.array[i];
2776                                 found = true;
2777                                 break;
2778                         }
2779
2780                         if (rmd->ctr.ctr1.array[i].attid != DRSUAPI_ATTRIBUTE_instanceType) {
2781                                 DEBUG(1,("Discarding older DRS attribute update to %s on %s from %s\n",
2782                                          msg->elements[i-removed_attrs].name,
2783                                          ldb_dn_get_linearized(msg->dn),
2784                                          GUID_string(ar, &rmd->ctr.ctr1.array[i].originating_invocation_id)));
2785                         }
2786
2787                         /* we don't want to apply this change so remove the attribute */
2788                         ldb_msg_remove_element(msg, &msg->elements[i-removed_attrs]);
2789                         removed_attrs++;
2790
2791                         found = true;
2792                         break;
2793                 }
2794
2795                 if (found) continue;
2796
2797                 nmd.ctr.ctr1.array[ni] = rmd->ctr.ctr1.array[i];
2798                 ni++;
2799         }
2800
2801         /*
2802          * finally correct the size of the meta_data array
2803          */
2804         nmd.ctr.ctr1.count = ni;
2805
2806         /*
2807          * the rdn attribute (the alias for the name attribute),
2808          * 'cn' for most objects is the last entry in the meta data array
2809          * we have stored
2810          *
2811          * sort the new meta data array
2812          */
2813         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ar->schema, msg->dn);
2814         if (ret != LDB_SUCCESS) {
2815                 return ret;
2816         }
2817
2818         /*
2819          * check if some replicated attributes left, otherwise skip the ldb_modify() call
2820          */
2821         if (msg->num_elements == 0) {
2822                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: skip replace\n",
2823                           ar->index_current);
2824
2825                 ar->index_current++;
2826                 return replmd_replicated_apply_next(ar);
2827         }
2828
2829         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: replace %u attributes\n",
2830                   ar->index_current, msg->num_elements);
2831
2832         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2833         if (ret != LDB_SUCCESS) {
2834                 return replmd_replicated_request_error(ar, ret);
2835         }
2836
2837         for (i=0; i<ni; i++) {
2838                 nmd.ctr.ctr1.array[i].local_usn = ar->seq_num;
2839         }
2840
2841         /* create the meta data value */
2842         ndr_err = ndr_push_struct_blob(&nmd_value, msg, 
2843                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
2844                                        &nmd,
2845                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2846         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2847                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2848                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2849         }
2850
2851         /*
2852          * when we know that we'll modify the record, add the whenChanged, uSNChanged
2853          * and replPopertyMetaData attributes
2854          */
2855         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2856         if (ret != LDB_SUCCESS) {
2857                 return replmd_replicated_request_error(ar, ret);
2858         }
2859         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2860         if (ret != LDB_SUCCESS) {
2861                 return replmd_replicated_request_error(ar, ret);
2862         }
2863         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
2864         if (ret != LDB_SUCCESS) {
2865                 return replmd_replicated_request_error(ar, ret);
2866         }
2867
2868         replmd_ldb_message_sort(msg, ar->schema);
2869
2870         /* we want to replace the old values */
2871         for (i=0; i < msg->num_elements; i++) {
2872                 msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
2873         }
2874
2875         if (DEBUGLVL(4)) {
2876                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
2877                 DEBUG(4, ("DRS replication modify message:\n%s\n", s));
2878                 talloc_free(s);
2879         }
2880
2881         ret = ldb_build_mod_req(&change_req,
2882                                 ldb,
2883                                 ar,
2884                                 msg,
2885                                 ar->controls,
2886                                 ar,
2887                                 replmd_op_callback,
2888                                 ar->req);
2889         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2890
2891         return ldb_next_request(ar->module, change_req);
2892 }
2893
2894 static int replmd_replicated_apply_search_callback(struct ldb_request *req,
2895                                                    struct ldb_reply *ares)
2896 {
2897         struct replmd_replicated_request *ar = talloc_get_type(req->context,
2898                                                struct replmd_replicated_request);
2899         int ret;
2900
2901         if (!ares) {
2902                 return ldb_module_done(ar->req, NULL, NULL,
2903                                         LDB_ERR_OPERATIONS_ERROR);
2904         }
2905         if (ares->error != LDB_SUCCESS &&
2906             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
2907                 return ldb_module_done(ar->req, ares->controls,
2908                                         ares->response, ares->error);
2909         }
2910
2911         switch (ares->type) {
2912         case LDB_REPLY_ENTRY:
2913                 ar->search_msg = talloc_steal(ar, ares->message);
2914                 break;
2915
2916         case LDB_REPLY_REFERRAL:
2917                 /* we ignore referrals */
2918                 break;
2919
2920         case LDB_REPLY_DONE:
2921                 if (ar->search_msg != NULL) {
2922                         ret = replmd_replicated_apply_merge(ar);
2923                 } else {
2924                         ret = replmd_replicated_apply_add(ar);
2925                 }
2926                 if (ret != LDB_SUCCESS) {
2927                         return ldb_module_done(ar->req, NULL, NULL, ret);
2928                 }
2929         }
2930
2931         talloc_free(ares);
2932         return LDB_SUCCESS;
2933 }
2934
2935 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar);
2936
2937 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar)
2938 {
2939         struct ldb_context *ldb;
2940         int ret;
2941         char *tmp_str;
2942         char *filter;
2943         struct ldb_request *search_req;
2944         struct ldb_search_options_control *options;
2945
2946         if (ar->index_current >= ar->objs->num_objects) {
2947                 /* done with it, go to next stage */
2948                 return replmd_replicated_uptodate_vector(ar);
2949         }
2950
2951         ldb = ldb_module_get_ctx(ar->module);
2952         ar->search_msg = NULL;
2953
2954         tmp_str = ldb_binary_encode(ar, ar->objs->objects[ar->index_current].guid_value);
2955         if (!tmp_str) return replmd_replicated_request_werror(ar, WERR_NOMEM);