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
  51 #define W2K3_LINKED_ATTRIBUTES 1
  52
  53 struct replmd_private {
  54         TALLOC_CTX *la_ctx;
  55         struct la_entry *la_list;
  56         TALLOC_CTX *bl_ctx;
  57         struct la_backlink *la_backlinks;
  58         struct nc_entry {
  59                 struct nc_entry *prev, *next;
  60                 struct ldb_dn *dn;
  61                 uint64_t mod_usn;
  62         } *ncs;
  63 };
  64
  65 struct la_entry {
  66         struct la_entry *next, *prev;
  67         struct drsuapi_DsReplicaLinkedAttribute *la;
  68 };
  69
  70 struct replmd_replicated_request {
  71         struct ldb_module *module;
  72         struct ldb_request *req;
  73
  74         const struct dsdb_schema *schema;
  75
  76         /* the controls we pass down */
  77         struct ldb_control **controls;
  78
  79         /* details for the mode where we apply a bunch of inbound replication meessages */
  80         bool apply_mode;
  81         uint32_t index_current;
  82         struct dsdb_extended_replicated_objects *objs;
  83
  84         struct ldb_message *search_msg;
  85
  86         uint64_t seq_num;
  87
  88 };
  89
  90 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar);
  91
  92
  93 /*
  94   initialise the module
  95   allocate the private structure and build the list
  96   of partition DNs for use by replmd_notify()
  97  */
  98 static int replmd_init(struct ldb_module *module)
  99 {
 100         struct replmd_private *replmd_private;
 101         struct ldb_context *ldb = ldb_module_get_ctx(module);
 102
 103         replmd_private = talloc_zero(module, struct replmd_private);
 104         if (replmd_private == NULL) {
 105                 ldb_oom(ldb);
 106                 return LDB_ERR_OPERATIONS_ERROR;
 107         }
 108         ldb_module_set_private(module, replmd_private);
 109
 110         return ldb_next_init(module);
 111 }
 112
 113 /*
 114   cleanup our per-transaction contexts
 115  */
 116 static void replmd_txn_cleanup(struct replmd_private *replmd_private)
 117 {
 118         talloc_free(replmd_private->la_ctx);
 119         replmd_private->la_list = NULL;
 120         replmd_private->la_ctx = NULL;
 121
 122         talloc_free(replmd_private->bl_ctx);
 123         replmd_private->la_backlinks = NULL;
 124         replmd_private->bl_ctx = NULL;
 125 }
 126
 127
 128 struct la_backlink {
 129         struct la_backlink *next, *prev;
 130         const char *attr_name;
 131         struct GUID forward_guid, target_guid;
 132         bool active;
 133 };
 134
 135 /*
 136   process a backlinks we accumulated during a transaction, adding and
 137   deleting the backlinks from the target objects
 138  */
 139 static int replmd_process_backlink(struct ldb_module *module, struct la_backlink *bl)
 140 {
 141         struct ldb_dn *target_dn, *source_dn;
 142         int ret;
 143         struct ldb_context *ldb = ldb_module_get_ctx(module);
 144         struct ldb_message *msg;
 145         TALLOC_CTX *tmp_ctx = talloc_new(bl);
 146         char *dn_string;
 147
 148         /*
 149           - find DN of target
 150           - find DN of source
 151           - construct ldb_message
 152               - either an add or a delete
 153          */
 154         ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->target_guid, &target_dn);
 155         if (ret != LDB_SUCCESS) {
 156                 ldb_asprintf_errstring(ldb, "Failed to find target DN for linked attribute with GUID %s\n",
 157                                        GUID_string(bl, &bl->target_guid));
 158                 talloc_free(tmp_ctx);
 159                 return ret;
 160         }
 161
 162         ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->forward_guid, &source_dn);
 163         if (ret != LDB_SUCCESS) {
 164                 ldb_asprintf_errstring(ldb, "Failed to find source DN for linked attribute with GUID %s\n",
 165                                        GUID_string(bl, &bl->forward_guid));
 166                 talloc_free(tmp_ctx);
 167                 return ret;
 168         }
 169
 170         msg = ldb_msg_new(tmp_ctx);
 171         if (msg == NULL) {
 172                 ldb_module_oom(module);
 173                 talloc_free(tmp_ctx);
 174                 return LDB_ERR_OPERATIONS_ERROR;
 175         }
 176
 177         /* construct a ldb_message for adding/deleting the backlink */
 178         msg->dn = target_dn;
 179         dn_string = ldb_dn_get_extended_linearized(tmp_ctx, source_dn, 1);
 180         if (!dn_string) {
 181                 ldb_module_oom(module);
 182                 talloc_free(tmp_ctx);
 183                 return LDB_ERR_OPERATIONS_ERROR;
 184         }
 185         ret = ldb_msg_add_steal_string(msg, bl->attr_name, dn_string);
 186         if (ret != LDB_SUCCESS) {
 187                 talloc_free(tmp_ctx);
 188                 return ret;
 189         }
 190         msg->elements[0].flags = bl->active?LDB_FLAG_MOD_ADD:LDB_FLAG_MOD_DELETE;
 191
 192         ret = dsdb_module_modify(module, msg, 0);
 193         if (ret != LDB_SUCCESS) {
 194                 ldb_asprintf_errstring(ldb, "Failed to %s backlink from %s to %s - %s",
 195                                        bl->active?"add":"remove",
 196                                        ldb_dn_get_linearized(source_dn),
 197                                        ldb_dn_get_linearized(target_dn),
 198                                        ldb_errstring(ldb));
 199                 talloc_free(tmp_ctx);
 200                 return ret;
 201         }
 202         talloc_free(tmp_ctx);
 203         return ret;
 204 }
 205
 206 /*
 207   add a backlink to the list of backlinks to add/delete in the prepare
 208   commit
 209  */
 210 static int replmd_add_backlink(struct ldb_module *module, const struct dsdb_schema *schema,
 211                                struct GUID *forward_guid, struct GUID *target_guid,
 212                                bool active, const struct dsdb_attribute *schema_attr, bool immediate)
 213 {
 214         const struct dsdb_attribute *target_attr;
 215         struct la_backlink *bl;
 216         struct replmd_private *replmd_private =
 217                 talloc_get_type_abort(ldb_module_get_private(module), struct replmd_private);
 218
 219         target_attr = dsdb_attribute_by_linkID(schema, schema_attr->linkID ^ 1);
 220         if (!target_attr) {
 221                 /*
 222                  * windows 2003 has a broken schema where the
 223                  * definition of msDS-IsDomainFor is missing (which is
 224                  * supposed to be the backlink of the
 225                  * msDS-HasDomainNCs attribute
 226                  */
 227                 return LDB_SUCCESS;
 228         }
 229
 230         /* see if its already in the list */
 231         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
 232                 if (GUID_equal(forward_guid, &bl->forward_guid) &&
 233                     GUID_equal(target_guid, &bl->target_guid) &&
 234                     (target_attr->lDAPDisplayName == bl->attr_name ||
 235                      strcmp(target_attr->lDAPDisplayName, bl->attr_name) == 0)) {
 236                         break;
 237                 }
 238         }
 239
 240         if (bl) {
 241                 /* we found an existing one */
 242                 if (bl->active == active) {
 243                         return LDB_SUCCESS;
 244                 }
 245                 DLIST_REMOVE(replmd_private->la_backlinks, bl);
 246                 talloc_free(bl);
 247                 return LDB_SUCCESS;
 248         }
 249
 250         if (replmd_private->bl_ctx == NULL) {
 251                 replmd_private->bl_ctx = talloc_new(replmd_private);
 252                 if (replmd_private->bl_ctx == NULL) {
 253                         ldb_module_oom(module);
 254                         return LDB_ERR_OPERATIONS_ERROR;
 255                 }
 256         }
 257
 258         /* its a new one */
 259         bl = talloc(replmd_private->bl_ctx, struct la_backlink);
 260         if (bl == NULL) {
 261                 ldb_module_oom(module);
 262                 return LDB_ERR_OPERATIONS_ERROR;
 263         }
 264
 265         bl->attr_name = target_attr->lDAPDisplayName;
 266         bl->forward_guid = *forward_guid;
 267         bl->target_guid = *target_guid;
 268         bl->active = active;
 269
 270         /* the caller may ask for this backlink to be processed
 271            immediately */
 272         if (immediate) {
 273                 int ret = replmd_process_backlink(module, bl);
 274                 talloc_free(bl);
 275                 return ret;
 276         }
 277
 278         DLIST_ADD(replmd_private->la_backlinks, bl);
 279
 280         return LDB_SUCCESS;
 281 }
 282
 283
 284 /*
 285  * Callback for most write operations in this module:
 286  *
 287  * notify the repl task that a object has changed. The notifies are
 288  * gathered up in the replmd_private structure then written to the
 289  * @REPLCHANGED object in each partition during the prepare_commit
 290  */
 291 static int replmd_op_callback(struct ldb_request *req, struct ldb_reply *ares)
 292 {
 293         int ret;
 294         struct replmd_replicated_request *ac =
 295                 talloc_get_type_abort(req->context, struct replmd_replicated_request);
 296         struct replmd_private *replmd_private =
 297                 talloc_get_type_abort(ldb_module_get_private(ac->module), struct replmd_private);
 298         struct nc_entry *modified_partition;
 299         struct ldb_control *partition_ctrl;
 300         const struct dsdb_control_current_partition *partition;
 301
 302         struct ldb_control **controls;
 303
 304         partition_ctrl = ldb_reply_get_control(ares, DSDB_CONTROL_CURRENT_PARTITION_OID);
 305
 306         /* Remove the 'partition' control from what we pass up the chain */
 307         controls = controls_except_specified(ares->controls, ares, partition_ctrl);
 308
 309         if (ares->error != LDB_SUCCESS) {
 310                 return ldb_module_done(ac->req, controls,
 311                                         ares->response, ares->error);
 312         }
 313
 314         if (ares->type != LDB_REPLY_DONE) {
 315                 ldb_set_errstring(ldb_module_get_ctx(ac->module), "Invalid reply type for notify\n!");
 316                 return ldb_module_done(ac->req, NULL,
 317                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 318         }
 319
 320         if (!partition_ctrl) {
 321                 ldb_set_errstring(ldb_module_get_ctx(ac->module),"No partition control on reply");
 322                 return ldb_module_done(ac->req, NULL,
 323                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 324         }
 325
 326         partition = talloc_get_type_abort(partition_ctrl->data,
 327                                     struct dsdb_control_current_partition);
 328
 329         if (ac->seq_num > 0) {
 330                 for (modified_partition = replmd_private->ncs; modified_partition;
 331                      modified_partition = modified_partition->next) {
 332                         if (ldb_dn_compare(modified_partition->dn, partition->dn) == 0) {
 333                                 break;
 334                         }
 335                 }
 336
 337                 if (modified_partition == NULL) {
 338                         modified_partition = talloc_zero(replmd_private, struct nc_entry);
 339                         if (!modified_partition) {
 340                                 ldb_oom(ldb_module_get_ctx(ac->module));
 341                                 return ldb_module_done(ac->req, NULL,
 342                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 343                         }
 344                         modified_partition->dn = ldb_dn_copy(modified_partition, partition->dn);
 345                         if (!modified_partition->dn) {
 346                                 ldb_oom(ldb_module_get_ctx(ac->module));
 347                                 return ldb_module_done(ac->req, NULL,
 348                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 349                         }
 350                         DLIST_ADD(replmd_private->ncs, modified_partition);
 351                 }
 352
 353                 if (ac->seq_num > modified_partition->mod_usn) {
 354                         modified_partition->mod_usn = ac->seq_num;
 355                 }
 356         }
 357
 358         if (ac->apply_mode) {
 359                 talloc_free(ares);
 360                 ac->index_current++;
 361
 362                 ret = replmd_replicated_apply_next(ac);
 363                 if (ret != LDB_SUCCESS) {
 364                         return ldb_module_done(ac->req, NULL, NULL, ret);
 365                 }
 366                 return ret;
 367         } else {
 368                 /* free the partition control container here, for the
 369                  * common path.  Other cases will have it cleaned up
 370                  * eventually with the ares */
 371                 talloc_free(partition_ctrl);
 372                 return ldb_module_done(ac->req,
 373                                        controls_except_specified(controls, ares, partition_ctrl),
 374                                        ares->response, LDB_SUCCESS);
 375         }
 376 }
 377
 378
 379 /*
 380  * update a @REPLCHANGED record in each partition if there have been
 381  * any writes of replicated data in the partition
 382  */
 383 static int replmd_notify_store(struct ldb_module *module)
 384 {
 385         struct replmd_private *replmd_private =
 386                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
 387         struct ldb_context *ldb = ldb_module_get_ctx(module);
 388
 389         while (replmd_private->ncs) {
 390                 int ret;
 391                 struct nc_entry *modified_partition = replmd_private->ncs;
 392
 393                 ret = dsdb_save_partition_usn(ldb, modified_partition->dn, modified_partition->mod_usn);
 394                 if (ret != LDB_SUCCESS) {
 395                         DEBUG(0,(__location__ ": Failed to save partition uSN for %s\n",
 396                                  ldb_dn_get_linearized(modified_partition->dn)));
 397                         return ret;
 398                 }
 399                 DLIST_REMOVE(replmd_private->ncs, modified_partition);
 400                 talloc_free(modified_partition);
 401         }
 402
 403         return LDB_SUCCESS;
 404 }
 405
 406
 407 /*
 408   created a replmd_replicated_request context
 409  */
 410 static struct replmd_replicated_request *replmd_ctx_init(struct ldb_module *module,
 411                                                          struct ldb_request *req)
 412 {
 413         struct ldb_context *ldb;
 414         struct replmd_replicated_request *ac;
 415
 416         ldb = ldb_module_get_ctx(module);
 417
 418         ac = talloc_zero(req, struct replmd_replicated_request);
 419         if (ac == NULL) {
 420                 ldb_oom(ldb);
 421                 return NULL;
 422         }
 423
 424         ac->module = module;
 425         ac->req = req;
 426
 427         ac->schema = dsdb_get_schema(ldb);
 428         if (!ac->schema) {
 429                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
 430                               "replmd_modify: no dsdb_schema loaded");
 431                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
 432                 return NULL;
 433         }
 434
 435         return ac;
 436 }
 437
 438 /*
 439   add a time element to a record
 440 */
 441 static int add_time_element(struct ldb_message *msg, const char *attr, time_t t)
 442 {
 443         struct ldb_message_element *el;
 444         char *s;
 445
 446         if (ldb_msg_find_element(msg, attr) != NULL) {
 447                 return LDB_SUCCESS;
 448         }
 449
 450         s = ldb_timestring(msg, t);
 451         if (s == NULL) {
 452                 return LDB_ERR_OPERATIONS_ERROR;
 453         }
 454
 455         if (ldb_msg_add_string(msg, attr, s) != LDB_SUCCESS) {
 456                 return LDB_ERR_OPERATIONS_ERROR;
 457         }
 458
 459         el = ldb_msg_find_element(msg, attr);
 460         /* always set as replace. This works because on add ops, the flag
 461            is ignored */
 462         el->flags = LDB_FLAG_MOD_REPLACE;
 463
 464         return LDB_SUCCESS;
 465 }
 466
 467 /*
 468   add a uint64_t element to a record
 469 */
 470 static int add_uint64_element(struct ldb_message *msg, const char *attr, uint64_t v)
 471 {
 472         struct ldb_message_element *el;
 473
 474         if (ldb_msg_find_element(msg, attr) != NULL) {
 475                 return LDB_SUCCESS;
 476         }
 477
 478         if (ldb_msg_add_fmt(msg, attr, "%llu", (unsigned long long)v) != LDB_SUCCESS) {
 479                 return LDB_ERR_OPERATIONS_ERROR;
 480         }
 481
 482         el = ldb_msg_find_element(msg, attr);
 483         /* always set as replace. This works because on add ops, the flag
 484            is ignored */
 485         el->flags = LDB_FLAG_MOD_REPLACE;
 486
 487         return LDB_SUCCESS;
 488 }
 489
 490 static int replmd_replPropertyMetaData1_attid_sort(const struct replPropertyMetaData1 *m1,
 491                                                    const struct replPropertyMetaData1 *m2,
 492                                                    const uint32_t *rdn_attid)
 493 {
 494         if (m1->attid == m2->attid) {
 495                 return 0;
 496         }
 497
 498         /*
 499          * the rdn attribute should be at the end!
 500          * so we need to return a value greater than zero
 501          * which means m1 is greater than m2
 502          */
 503         if (m1->attid == *rdn_attid) {
 504                 return 1;
 505         }
 506
 507         /*
 508          * the rdn attribute should be at the end!
 509          * so we need to return a value less than zero
 510          * which means m2 is greater than m1
 511          */
 512         if (m2->attid == *rdn_attid) {
 513                 return -1;
 514         }
 515
 516         return m1->attid > m2->attid ? 1 : -1;
 517 }
 518
 519 static int replmd_replPropertyMetaDataCtr1_sort(struct replPropertyMetaDataCtr1 *ctr1,
 520                                                 const struct dsdb_schema *schema,
 521                                                 struct ldb_dn *dn)
 522 {
 523         const char *rdn_name;
 524         const struct dsdb_attribute *rdn_sa;
 525
 526         rdn_name = ldb_dn_get_rdn_name(dn);
 527         if (!rdn_name) {
 528                 DEBUG(0,(__location__ ": No rDN for %s?\n", ldb_dn_get_linearized(dn)));
 529                 return LDB_ERR_OPERATIONS_ERROR;
 530         }
 531
 532         rdn_sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
 533         if (rdn_sa == NULL) {
 534                 DEBUG(0,(__location__ ": No sa found for rDN %s for %s\n", rdn_name, ldb_dn_get_linearized(dn)));
 535                 return LDB_ERR_OPERATIONS_ERROR;
 536         }
 537
 538         DEBUG(6,("Sorting rpmd with attid exception %u rDN=%s DN=%s\n",
 539                  rdn_sa->attributeID_id, rdn_name, ldb_dn_get_linearized(dn)));
 540
 541         ldb_qsort(ctr1->array, ctr1->count, sizeof(struct replPropertyMetaData1),
 542                   discard_const_p(void, &rdn_sa->attributeID_id),
 543                   (ldb_qsort_cmp_fn_t)replmd_replPropertyMetaData1_attid_sort);
 544
 545         return LDB_SUCCESS;
 546 }
 547
 548 static int replmd_ldb_message_element_attid_sort(const struct ldb_message_element *e1,
 549                                                  const struct ldb_message_element *e2,
 550                                                  const struct dsdb_schema *schema)
 551 {
 552         const struct dsdb_attribute *a1;
 553         const struct dsdb_attribute *a2;
 554
 555         /*
 556          * TODO: make this faster by caching the dsdb_attribute pointer
 557          *       on the ldb_messag_element
 558          */
 559
 560         a1 = dsdb_attribute_by_lDAPDisplayName(schema, e1->name);
 561         a2 = dsdb_attribute_by_lDAPDisplayName(schema, e2->name);
 562
 563         /*
 564          * TODO: remove this check, we should rely on e1 and e2 having valid attribute names
 565          *       in the schema
 566          */
 567         if (!a1 || !a2) {
 568                 return strcasecmp(e1->name, e2->name);
 569         }
 570         if (a1->attributeID_id == a2->attributeID_id) {
 571                 return 0;
 572         }
 573         return a1->attributeID_id > a2->attributeID_id ? 1 : -1;
 574 }
 575
 576 static void replmd_ldb_message_sort(struct ldb_message *msg,
 577                                     const struct dsdb_schema *schema)
 578 {
 579         ldb_qsort(msg->elements, msg->num_elements, sizeof(struct ldb_message_element),
 580                   discard_const_p(void, schema), (ldb_qsort_cmp_fn_t)replmd_ldb_message_element_attid_sort);
 581 }
 582
 583 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
 584                                const struct GUID *invocation_id, uint64_t seq_num,
 585                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted);
 586
 587
 588 /*
 589   fix up linked attributes in replmd_add.
 590   This involves setting up the right meta-data in extended DN
 591   components, and creating backlinks to the object
 592  */
 593 static int replmd_add_fix_la(struct ldb_module *module, struct ldb_message_element *el,
 594                              uint64_t seq_num, const struct GUID *invocationId, time_t t,
 595                              struct GUID *guid, const struct dsdb_attribute *sa)
 596 {
 597         int i;
 598         TALLOC_CTX *tmp_ctx = talloc_new(el->values);
 599         struct ldb_context *ldb = ldb_module_get_ctx(module);
 600         struct dsdb_schema *schema = dsdb_get_schema(ldb);
 601         NTTIME now;
 602
 603         unix_to_nt_time(&now, t);
 604
 605         for (i=0; i<el->num_values; i++) {
 606                 struct ldb_val *v = &el->values[i];
 607                 struct dsdb_dn *dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, v, sa->syntax->ldap_oid);
 608                 struct GUID target_guid;
 609                 NTSTATUS status;
 610                 int ret;
 611
 612                 ret = replmd_build_la_val(el->values, v, dsdb_dn, invocationId,
 613                                           seq_num, seq_num, now, 0, false);
 614                 if (ret != LDB_SUCCESS) {
 615                         talloc_free(tmp_ctx);
 616                         return ret;
 617                 }
 618
 619                 /* note that the DN already has the extended
 620                    components from the extended_dn_store module */
 621                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
 622                 if (!NT_STATUS_IS_OK(status) || GUID_all_zero(&target_guid)) {
 623                         ret = dsdb_module_guid_by_dn(module, dsdb_dn->dn, &target_guid);
 624                         if (ret != LDB_SUCCESS) {
 625                                 talloc_free(tmp_ctx);
 626                                 return ret;
 627                         }
 628                 }
 629
 630                 ret = replmd_add_backlink(module, schema, guid, &target_guid, true, sa, false);
 631                 if (ret != LDB_SUCCESS) {
 632                         talloc_free(tmp_ctx);
 633                         return ret;
 634                 }
 635         }
 636
 637         talloc_free(tmp_ctx);
 638         return LDB_SUCCESS;
 639 }
 640
 641
 642 /*
 643   intercept add requests
 644  */
 645 static int replmd_add(struct ldb_module *module, struct ldb_request *req)
 646 {
 647         struct ldb_context *ldb;
 648         struct ldb_control *control;
 649         struct replmd_replicated_request *ac;
 650         enum ndr_err_code ndr_err;
 651         struct ldb_request *down_req;
 652         struct ldb_message *msg;
 653         const DATA_BLOB *guid_blob;
 654         struct GUID guid;
 655         struct replPropertyMetaDataBlob nmd;
 656         struct ldb_val nmd_value;
 657         const struct GUID *our_invocation_id;
 658         time_t t = time(NULL);
 659         NTTIME now;
 660         char *time_str;
 661         int ret;
 662         uint32_t i, ni=0;
 663         bool allow_add_guid = false;
 664         bool remove_current_guid = false;
 665
 666         /* check if there's a show relax control (used by provision to say 'I know what I'm doing') */
 667         control = ldb_request_get_control(req, LDB_CONTROL_RELAX_OID);
 668         if (control) {
 669                 allow_add_guid = 1;
 670         }
 671
 672         /* do not manipulate our control entries */
 673         if (ldb_dn_is_special(req->op.add.message->dn)) {
 674                 return ldb_next_request(module, req);
 675         }
 676
 677         ldb = ldb_module_get_ctx(module);
 678
 679         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_add\n");
 680
 681         ac = replmd_ctx_init(module, req);
 682         if (!ac) {
 683                 return LDB_ERR_OPERATIONS_ERROR;
 684         }
 685
 686         guid_blob = ldb_msg_find_ldb_val(req->op.add.message, "objectGUID");
 687         if ( guid_blob != NULL ) {
 688                 if( !allow_add_guid ) {
 689                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 690                               "replmd_add: it's not allowed to add an object with objectGUID\n");
 691                         talloc_free(ac);
 692                         return LDB_ERR_UNWILLING_TO_PERFORM;
 693                 } else {
 694                         NTSTATUS status = GUID_from_data_blob(guid_blob,&guid);
 695                         if ( !NT_STATUS_IS_OK(status)) {
 696                                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 697                                       "replmd_add: Unable to parse as a GUID the attribute objectGUID\n");
 698                                 talloc_free(ac);
 699                                 return LDB_ERR_UNWILLING_TO_PERFORM;
 700                         }
 701                         /* we remove this attribute as it can be a string and will not be treated
 702                         correctly and then we will readd it latter on in the good format*/
 703                         remove_current_guid = true;
 704                 }
 705         } else {
 706                 /* a new GUID */
 707                 guid = GUID_random();
 708         }
 709
 710         /* Get a sequence number from the backend */
 711         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
 712         if (ret != LDB_SUCCESS) {
 713                 talloc_free(ac);
 714                 return ret;
 715         }
 716
 717         /* get our invocationId */
 718         our_invocation_id = samdb_ntds_invocation_id(ldb);
 719         if (!our_invocation_id) {
 720                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 721                               "replmd_add: unable to find invocationId\n");
 722                 talloc_free(ac);
 723                 return LDB_ERR_OPERATIONS_ERROR;
 724         }
 725
 726         /* we have to copy the message as the caller might have it as a const */
 727         msg = ldb_msg_copy_shallow(ac, req->op.add.message);
 728         if (msg == NULL) {
 729                 ldb_oom(ldb);
 730                 talloc_free(ac);
 731                 return LDB_ERR_OPERATIONS_ERROR;
 732         }
 733
 734         /* generated times */
 735         unix_to_nt_time(&now, t);
 736         time_str = ldb_timestring(msg, t);
 737         if (!time_str) {
 738                 ldb_oom(ldb);
 739                 talloc_free(ac);
 740                 return LDB_ERR_OPERATIONS_ERROR;
 741         }
 742         if (remove_current_guid) {
 743                 ldb_msg_remove_attr(msg,"objectGUID");
 744         }
 745
 746         /*
 747          * remove autogenerated attributes
 748          */
 749         ldb_msg_remove_attr(msg, "whenCreated");
 750         ldb_msg_remove_attr(msg, "whenChanged");
 751         ldb_msg_remove_attr(msg, "uSNCreated");
 752         ldb_msg_remove_attr(msg, "uSNChanged");
 753         ldb_msg_remove_attr(msg, "replPropertyMetaData");
 754
 755         /*
 756          * readd replicated attributes
 757          */
 758         ret = ldb_msg_add_string(msg, "whenCreated", time_str);
 759         if (ret != LDB_SUCCESS) {
 760                 ldb_oom(ldb);
 761                 talloc_free(ac);
 762                 return ret;
 763         }
 764
 765         /* build the replication meta_data */
 766         ZERO_STRUCT(nmd);
 767         nmd.version             = 1;
 768         nmd.ctr.ctr1.count      = msg->num_elements;
 769         nmd.ctr.ctr1.array      = talloc_array(msg,
 770                                                struct replPropertyMetaData1,
 771                                                nmd.ctr.ctr1.count);
 772         if (!nmd.ctr.ctr1.array) {
 773                 ldb_oom(ldb);
 774                 talloc_free(ac);
 775                 return LDB_ERR_OPERATIONS_ERROR;
 776         }
 777
 778         for (i=0; i < msg->num_elements; i++) {
 779                 struct ldb_message_element *e = &msg->elements[i];
 780                 struct replPropertyMetaData1 *m = &nmd.ctr.ctr1.array[ni];
 781                 const struct dsdb_attribute *sa;
 782
 783                 if (e->name[0] == '@') continue;
 784
 785                 sa = dsdb_attribute_by_lDAPDisplayName(ac->schema, e->name);
 786                 if (!sa) {
 787                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 788                                       "replmd_add: attribute '%s' not defined in schema\n",
 789                                       e->name);
 790                         talloc_free(ac);
 791                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
 792                 }
 793
 794                 if ((sa->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (sa->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
 795                         /* if the attribute is not replicated (0x00000001)
 796                          * or constructed (0x00000004) it has no metadata
 797                          */
 798                         continue;
 799                 }
 800
 801 #if W2K3_LINKED_ATTRIBUTES
 802                 if (sa->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
 803                         ret = replmd_add_fix_la(module, e, ac->seq_num, our_invocation_id, t, &guid, sa);
 804                         if (ret != LDB_SUCCESS) {
 805                                 talloc_free(ac);
 806                                 return ret;
 807                         }
 808                         /* linked attributes are not stored in
 809                            replPropertyMetaData in FL above w2k */
 810                         continue;
 811                 }
 812 #endif
 813
 814                 m->attid                        = sa->attributeID_id;
 815                 m->version                      = 1;
 816                 m->originating_change_time      = now;
 817                 m->originating_invocation_id    = *our_invocation_id;
 818                 m->originating_usn              = ac->seq_num;
 819                 m->local_usn                    = ac->seq_num;
 820                 ni++;
 821         }
 822
 823         /* fix meta data count */
 824         nmd.ctr.ctr1.count = ni;
 825
 826         /*
 827          * sort meta data array, and move the rdn attribute entry to the end
 828          */
 829         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ac->schema, msg->dn);
 830         if (ret != LDB_SUCCESS) {
 831                 talloc_free(ac);
 832                 return ret;
 833         }
 834
 835         /* generated NDR encoded values */
 836         ndr_err = ndr_push_struct_blob(&nmd_value, msg,
 837                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
 838                                        &nmd,
 839                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
 840         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 841                 ldb_oom(ldb);
 842                 talloc_free(ac);
 843                 return LDB_ERR_OPERATIONS_ERROR;
 844         }
 845
 846         /*
 847          * add the autogenerated values
 848          */
 849         ret = dsdb_msg_add_guid(msg, &guid, "objectGUID");
 850         if (ret != LDB_SUCCESS) {
 851                 ldb_oom(ldb);
 852                 talloc_free(ac);
 853                 return ret;
 854         }
 855         ret = ldb_msg_add_string(msg, "whenChanged", time_str);
 856         if (ret != LDB_SUCCESS) {
 857                 ldb_oom(ldb);
 858                 talloc_free(ac);
 859                 return ret;
 860         }
 861         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ac->seq_num);
 862         if (ret != LDB_SUCCESS) {
 863                 ldb_oom(ldb);
 864                 talloc_free(ac);
 865                 return ret;
 866         }
 867         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ac->seq_num);
 868         if (ret != LDB_SUCCESS) {
 869                 ldb_oom(ldb);
 870                 talloc_free(ac);
 871                 return ret;
 872         }
 873         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
 874         if (ret != LDB_SUCCESS) {
 875                 ldb_oom(ldb);
 876                 talloc_free(ac);
 877                 return ret;
 878         }
 879
 880         /*
 881          * sort the attributes by attid before storing the object
 882          */
 883         replmd_ldb_message_sort(msg, ac->schema);
 884
 885         ret = ldb_build_add_req(&down_req, ldb, ac,
 886                                 msg,
 887                                 req->controls,
 888                                 ac, replmd_op_callback,
 889                                 req);
 890         if (ret != LDB_SUCCESS) {
 891                 talloc_free(ac);
 892                 return ret;
 893         }
 894
 895         /* mark the control done */
 896         if (control) {
 897                 control->critical = 0;
 898         }
 899
 900         /* go on with the call chain */
 901         return ldb_next_request(module, down_req);
 902 }
 903
 904
 905 /*
 906  * update the replPropertyMetaData for one element
 907  */
 908 static int replmd_update_rpmd_element(struct ldb_context *ldb,
 909                                       struct ldb_message *msg,
 910                                       struct ldb_message_element *el,
 911                                       struct replPropertyMetaDataBlob *omd,
 912                                       const struct dsdb_schema *schema,
 913                                       uint64_t *seq_num,
 914                                       const struct GUID *our_invocation_id,
 915                                       NTTIME now)
 916 {
 917         int i;
 918         const struct dsdb_attribute *a;
 919         struct replPropertyMetaData1 *md1;
 920
 921         a = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
 922         if (a == NULL) {
 923                 DEBUG(0,(__location__ ": Unable to find attribute %s in schema\n",
 924                          el->name));
 925                 return LDB_ERR_OPERATIONS_ERROR;
 926         }
 927
 928         if ((a->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (a->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
 929                 return LDB_SUCCESS;
 930         }
 931
 932         for (i=0; i<omd->ctr.ctr1.count; i++) {
 933                 if (a->attributeID_id == omd->ctr.ctr1.array[i].attid) break;
 934         }
 935
 936 #if W2K3_LINKED_ATTRIBUTES
 937         if (a->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
 938                 /* linked attributes are not stored in
 939                    replPropertyMetaData in FL above w2k, but we do
 940                    raise the seqnum for the object  */
 941                 if (*seq_num == 0 &&
 942                     ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num) != LDB_SUCCESS) {
 943                         return LDB_ERR_OPERATIONS_ERROR;
 944                 }
 945                 return LDB_SUCCESS;
 946         }
 947 #endif
 948
 949         if (i == omd->ctr.ctr1.count) {
 950                 /* we need to add a new one */
 951                 omd->ctr.ctr1.array = talloc_realloc(msg, omd->ctr.ctr1.array,
 952                                                      struct replPropertyMetaData1, omd->ctr.ctr1.count+1);
 953                 if (omd->ctr.ctr1.array == NULL) {
 954                         ldb_oom(ldb);
 955                         return LDB_ERR_OPERATIONS_ERROR;
 956                 }
 957                 omd->ctr.ctr1.count++;
 958                 ZERO_STRUCT(omd->ctr.ctr1.array[i]);
 959         }
 960
 961         /* Get a new sequence number from the backend. We only do this
 962          * if we have a change that requires a new
 963          * replPropertyMetaData element
 964          */
 965         if (*seq_num == 0) {
 966                 int ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num);
 967                 if (ret != LDB_SUCCESS) {
 968                         return LDB_ERR_OPERATIONS_ERROR;
 969                 }
 970         }
 971
 972         md1 = &omd->ctr.ctr1.array[i];
 973         md1->version++;
 974         md1->attid                     = a->attributeID_id;
 975         md1->originating_change_time   = now;
 976         md1->originating_invocation_id = *our_invocation_id;
 977         md1->originating_usn           = *seq_num;
 978         md1->local_usn                 = *seq_num;
 979
 980         return LDB_SUCCESS;
 981 }
 982
 983 /*
 984  * update the replPropertyMetaData object each time we modify an
 985  * object. This is needed for DRS replication, as the merge on the
 986  * client is based on this object
 987  */
 988 static int replmd_update_rpmd(struct ldb_module *module,
 989                               const struct dsdb_schema *schema,
 990                               struct ldb_message *msg, uint64_t *seq_num,
 991                               time_t t)
 992 {
 993         const struct ldb_val *omd_value;
 994         enum ndr_err_code ndr_err;
 995         struct replPropertyMetaDataBlob omd;
 996         int i;
 997         NTTIME now;
 998         const struct GUID *our_invocation_id;
 999         int ret;
1000         const char *attrs[] = { "replPropertyMetaData" , NULL };
1001         struct ldb_result *res;
1002         struct ldb_context *ldb;
1003
1004         ldb = ldb_module_get_ctx(module);
1005
1006         our_invocation_id = samdb_ntds_invocation_id(ldb);
1007         if (!our_invocation_id) {
1008                 /* this happens during an initial vampire while
1009                    updating the schema */
1010                 DEBUG(5,("No invocationID - skipping replPropertyMetaData update\n"));
1011                 return LDB_SUCCESS;
1012         }
1013
1014         unix_to_nt_time(&now, t);
1015
1016         /* search for the existing replPropertyMetaDataBlob */
1017         ret = dsdb_search_dn_with_deleted(ldb, msg, &res, msg->dn, attrs);
1018         if (ret != LDB_SUCCESS || res->count != 1) {
1019                 DEBUG(0,(__location__ ": Object %s failed to find replPropertyMetaData\n",
1020                          ldb_dn_get_linearized(msg->dn)));
1021                 return LDB_ERR_OPERATIONS_ERROR;
1022         }
1023
1024
1025         omd_value = ldb_msg_find_ldb_val(res->msgs[0], "replPropertyMetaData");
1026         if (!omd_value) {
1027                 DEBUG(0,(__location__ ": Object %s does not have a replPropertyMetaData attribute\n",
1028                          ldb_dn_get_linearized(msg->dn)));
1029                 return LDB_ERR_OPERATIONS_ERROR;
1030         }
1031
1032         ndr_err = ndr_pull_struct_blob(omd_value, msg,
1033                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &omd,
1034                                        (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
1035         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1036                 DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
1037                          ldb_dn_get_linearized(msg->dn)));
1038                 return LDB_ERR_OPERATIONS_ERROR;
1039         }
1040
1041         if (omd.version != 1) {
1042                 DEBUG(0,(__location__ ": bad version %u in replPropertyMetaData for %s\n",
1043                          omd.version, ldb_dn_get_linearized(msg->dn)));
1044                 return LDB_ERR_OPERATIONS_ERROR;
1045         }
1046
1047         for (i=0; i<msg->num_elements; i++) {
1048                 ret = replmd_update_rpmd_element(ldb, msg, &msg->elements[i], &omd, schema, seq_num,
1049                                                  our_invocation_id, now);
1050                 if (ret != LDB_SUCCESS) {
1051                         return ret;
1052                 }
1053         }
1054
1055         /*
1056          * replmd_update_rpmd_element has done an update if the
1057          * seq_num is set
1058          */
1059         if (*seq_num != 0) {
1060                 struct ldb_val *md_value;
1061                 struct ldb_message_element *el;
1062
1063                 md_value = talloc(msg, struct ldb_val);
1064                 if (md_value == NULL) {
1065                         ldb_oom(ldb);
1066                         return LDB_ERR_OPERATIONS_ERROR;
1067                 }
1068
1069                 ret = replmd_replPropertyMetaDataCtr1_sort(&omd.ctr.ctr1, schema, msg->dn);
1070                 if (ret != LDB_SUCCESS) {
1071                         return ret;
1072                 }
1073
1074                 ndr_err = ndr_push_struct_blob(md_value, msg,
1075                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
1076                                                &omd,
1077                                                (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
1078                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1079                         DEBUG(0,(__location__ ": Failed to marshall replPropertyMetaData for %s\n",
1080                                  ldb_dn_get_linearized(msg->dn)));
1081                         return LDB_ERR_OPERATIONS_ERROR;
1082                 }
1083
1084                 ret = ldb_msg_add_empty(msg, "replPropertyMetaData", LDB_FLAG_MOD_REPLACE, &el);
1085                 if (ret != LDB_SUCCESS) {
1086                         DEBUG(0,(__location__ ": Failed to add updated replPropertyMetaData %s\n",
1087                                  ldb_dn_get_linearized(msg->dn)));
1088                         return ret;
1089                 }
1090
1091                 el->num_values = 1;
1092                 el->values = md_value;
1093         }
1094
1095         return LDB_SUCCESS;
1096 }
1097
1098
1099 struct parsed_dn {
1100         struct dsdb_dn *dsdb_dn;
1101         struct GUID *guid;
1102         struct ldb_val *v;
1103 };
1104
1105 static int parsed_dn_compare(struct parsed_dn *pdn1, struct parsed_dn *pdn2)
1106 {
1107         return GUID_compare(pdn1->guid, pdn2->guid);
1108 }
1109
1110 static struct parsed_dn *parsed_dn_find(struct parsed_dn *pdn, int count, struct GUID *guid, struct ldb_dn *dn)
1111 {
1112         struct parsed_dn *ret;
1113         if (dn && GUID_all_zero(guid)) {
1114                 /* when updating a link using DRS, we sometimes get a
1115                    NULL GUID. We then need to try and match by DN */
1116                 int i;
1117                 for (i=0; i<count; i++) {
1118                         if (ldb_dn_compare(pdn[i].dsdb_dn->dn, dn) == 0) {
1119                                 dsdb_get_extended_dn_guid(pdn[i].dsdb_dn->dn, guid, "GUID");
1120                                 return &pdn[i];
1121                         }
1122                 }
1123                 return NULL;
1124         }
1125         BINARY_ARRAY_SEARCH(pdn, count, guid, guid, GUID_compare, ret);
1126         return ret;
1127 }
1128
1129 /*
1130   get a series of message element values as an array of DNs and GUIDs
1131   the result is sorted by GUID
1132  */
1133 static int get_parsed_dns(struct ldb_module *module, TALLOC_CTX *mem_ctx,
1134                           struct ldb_message_element *el, struct parsed_dn **pdn,
1135                           const char *ldap_oid)
1136 {
1137         int i;
1138         struct ldb_context *ldb = ldb_module_get_ctx(module);
1139
1140         if (el == NULL) {
1141                 *pdn = NULL;
1142                 return LDB_SUCCESS;
1143         }
1144
1145         (*pdn) = talloc_array(mem_ctx, struct parsed_dn, el->num_values);
1146         if (!*pdn) {
1147                 ldb_module_oom(module);
1148                 return LDB_ERR_OPERATIONS_ERROR;
1149         }
1150
1151         for (i=0; i<el->num_values; i++) {
1152                 struct ldb_val *v = &el->values[i];
1153                 NTSTATUS status;
1154                 struct ldb_dn *dn;
1155                 struct parsed_dn *p;
1156
1157                 p = &(*pdn)[i];
1158
1159                 p->dsdb_dn = dsdb_dn_parse(*pdn, ldb, v, ldap_oid);
1160                 if (p->dsdb_dn == NULL) {
1161                         return LDB_ERR_INVALID_DN_SYNTAX;
1162                 }
1163
1164                 dn = p->dsdb_dn->dn;
1165
1166                 p->guid = talloc(*pdn, struct GUID);
1167                 if (p->guid == NULL) {
1168                         ldb_module_oom(module);
1169                         return LDB_ERR_OPERATIONS_ERROR;
1170                 }
1171
1172                 status = dsdb_get_extended_dn_guid(dn, p->guid, "GUID");
1173                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1174                         /* we got a DN without a GUID - go find the GUID */
1175                         int ret = dsdb_find_guid_by_dn(ldb, dn, p->guid);
1176                         if (ret != LDB_SUCCESS) {
1177                                 ldb_asprintf_errstring(ldb, "Unable to find GUID for DN %s\n",
1178                                                        ldb_dn_get_linearized(dn));
1179                                 return ret;
1180                         }
1181                 } else if (!NT_STATUS_IS_OK(status)) {
1182                         return LDB_ERR_OPERATIONS_ERROR;
1183                 }
1184
1185                 /* keep a pointer to the original ldb_val */
1186                 p->v = v;
1187         }
1188
1189         qsort(*pdn, el->num_values, sizeof((*pdn)[0]), (comparison_fn_t)parsed_dn_compare);
1190
1191         return LDB_SUCCESS;
1192 }
1193
1194 /*
1195   build a new extended DN, including all meta data fields
1196
1197   DELETED             = 1 or missing
1198   RMD_ADDTIME         = originating_add_time
1199   RMD_INVOCID         = originating_invocation_id
1200   RMD_CHANGETIME      = originating_change_time
1201   RMD_ORIGINATING_USN = originating_usn
1202   RMD_LOCAL_USN       = local_usn
1203   RMD_VERSION         = version
1204  */
1205 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1206                                const struct GUID *invocation_id, uint64_t seq_num,
1207                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted)
1208 {
1209         struct ldb_dn *dn = dsdb_dn->dn;
1210         const char *tstring, *usn_string;
1211         struct ldb_val tval;
1212         struct ldb_val iid;
1213         struct ldb_val usnv, local_usnv;
1214         struct ldb_val vers;
1215         NTSTATUS status;
1216         int ret;
1217         const char *dnstring;
1218         char *vstring;
1219
1220         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1221         if (!tstring) {
1222                 return LDB_ERR_OPERATIONS_ERROR;
1223         }
1224         tval = data_blob_string_const(tstring);
1225
1226         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1227         if (!usn_string) {
1228                 return LDB_ERR_OPERATIONS_ERROR;
1229         }
1230         usnv = data_blob_string_const(usn_string);
1231
1232         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1233         if (!usn_string) {
1234                 return LDB_ERR_OPERATIONS_ERROR;
1235         }
1236         local_usnv = data_blob_string_const(usn_string);
1237
1238         vstring = talloc_asprintf(mem_ctx, "%lu", (unsigned long)version);
1239         vers = data_blob_string_const(vstring);
1240
1241         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1242         if (!NT_STATUS_IS_OK(status)) {
1243                 return LDB_ERR_OPERATIONS_ERROR;
1244         }
1245
1246         if (deleted) {
1247                 struct ldb_val dv;
1248                 dv = data_blob_string_const("1");
1249                 ret = ldb_dn_set_extended_component(dn, "DELETED", &dv);
1250         } else {
1251                 ret = ldb_dn_set_extended_component(dn, "DELETED", NULL);
1252         }
1253         if (ret != LDB_SUCCESS) return ret;
1254         ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", &tval);
1255         if (ret != LDB_SUCCESS) return ret;
1256         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1257         if (ret != LDB_SUCCESS) return ret;
1258         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1259         if (ret != LDB_SUCCESS) return ret;
1260         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1261         if (ret != LDB_SUCCESS) return ret;
1262         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1263         if (ret != LDB_SUCCESS) return ret;
1264         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1265         if (ret != LDB_SUCCESS) return ret;
1266
1267         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1268         if (dnstring == NULL) {
1269                 return LDB_ERR_OPERATIONS_ERROR;
1270         }
1271         *v = data_blob_string_const(dnstring);
1272
1273         return LDB_SUCCESS;
1274 }
1275
1276 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1277                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1278                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1279                                 uint32_t version, bool deleted);
1280
1281 /*
1282   check if any links need upgrading from w2k format
1283  */
1284 static int replmd_check_upgrade_links(struct parsed_dn *dns, uint32_t count, const struct GUID *invocation_id)
1285 {
1286         int i;
1287         for (i=0; i<count; i++) {
1288                 NTSTATUS status;
1289                 uint32_t version;
1290                 int ret;
1291
1292                 status = dsdb_get_extended_dn_uint32(dns[i].dsdb_dn->dn, &version, "RMD_VERSION");
1293                 if (!NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1294                         continue;
1295                 }
1296
1297                 /* it's an old one that needs upgrading */
1298                 ret = replmd_update_la_val(dns, dns[i].v, dns[i].dsdb_dn, dns[i].dsdb_dn, invocation_id,
1299                                            1, 1, 0, 0, false);
1300                 if (ret != LDB_SUCCESS) {
1301                         return ret;
1302                 }
1303         }
1304         return LDB_SUCCESS;
1305 }
1306
1307 /*
1308   update an extended DN, including all meta data fields
1309
1310   see replmd_build_la_val for value names
1311  */
1312 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1313                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1314                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1315                                 uint32_t version, bool deleted)
1316 {
1317         struct ldb_dn *dn = dsdb_dn->dn;
1318         const char *tstring, *usn_string;
1319         struct ldb_val tval;
1320         struct ldb_val iid;
1321         struct ldb_val usnv, local_usnv;
1322         struct ldb_val vers;
1323         const struct ldb_val *old_addtime;
1324         uint32_t old_version;
1325         NTSTATUS status;
1326         int ret;
1327         const char *dnstring;
1328         char *vstring;
1329
1330         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1331         if (!tstring) {
1332                 return LDB_ERR_OPERATIONS_ERROR;
1333         }
1334         tval = data_blob_string_const(tstring);
1335
1336         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1337         if (!usn_string) {
1338                 return LDB_ERR_OPERATIONS_ERROR;
1339         }
1340         usnv = data_blob_string_const(usn_string);
1341
1342         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1343         if (!usn_string) {
1344                 return LDB_ERR_OPERATIONS_ERROR;
1345         }
1346         local_usnv = data_blob_string_const(usn_string);
1347
1348         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1349         if (!NT_STATUS_IS_OK(status)) {
1350                 return LDB_ERR_OPERATIONS_ERROR;
1351         }
1352
1353         if (deleted) {
1354                 struct ldb_val dv;
1355                 dv = data_blob_string_const("1");
1356                 ret = ldb_dn_set_extended_component(dn, "DELETED", &dv);
1357         } else {
1358                 ret = ldb_dn_set_extended_component(dn, "DELETED", NULL);
1359         }
1360         if (ret != LDB_SUCCESS) return ret;
1361
1362         /* get the ADDTIME from the original */
1363         old_addtime = ldb_dn_get_extended_component(old_dsdb_dn->dn, "RMD_ADDTIME");
1364         if (old_addtime == NULL) {
1365                 old_addtime = &tval;
1366         }
1367         if (dsdb_dn != old_dsdb_dn) {
1368                 ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", old_addtime);
1369                 if (ret != LDB_SUCCESS) return ret;
1370         }
1371
1372         /* use our invocation id */
1373         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1374         if (ret != LDB_SUCCESS) return ret;
1375
1376         /* changetime is the current time */
1377         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1378         if (ret != LDB_SUCCESS) return ret;
1379
1380         /* update the USN */
1381         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1382         if (ret != LDB_SUCCESS) return ret;
1383
1384         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1385         if (ret != LDB_SUCCESS) return ret;
1386
1387         /* increase the version by 1 */
1388         status = dsdb_get_extended_dn_uint32(old_dsdb_dn->dn, &old_version, "RMD_VERSION");
1389         if (NT_STATUS_IS_OK(status) && old_version >= version) {
1390                 version = old_version+1;
1391         }
1392         vstring = talloc_asprintf(dn, "%lu", (unsigned long)version);
1393         vers = data_blob_string_const(vstring);
1394         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1395         if (ret != LDB_SUCCESS) return ret;
1396
1397         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1398         if (dnstring == NULL) {
1399                 return LDB_ERR_OPERATIONS_ERROR;
1400         }
1401         *v = data_blob_string_const(dnstring);
1402
1403         return LDB_SUCCESS;
1404 }
1405
1406 /*
1407   handle adding a linked attribute
1408  */
1409 static int replmd_modify_la_add(struct ldb_module *module,
1410                                 struct dsdb_schema *schema,
1411                                 struct ldb_message *msg,
1412                                 struct ldb_message_element *el,
1413                                 struct ldb_message_element *old_el,
1414                                 const struct dsdb_attribute *schema_attr,
1415                                 uint64_t seq_num,
1416                                 time_t t,
1417                                 struct GUID *msg_guid)
1418 {
1419         int i;
1420         struct parsed_dn *dns, *old_dns;
1421         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1422         int ret;
1423         struct ldb_val *new_values = NULL;
1424         unsigned int num_new_values = 0;
1425         unsigned old_num_values = old_el?old_el->num_values:0;
1426         const struct GUID *invocation_id;
1427         struct ldb_context *ldb = ldb_module_get_ctx(module);
1428         NTTIME now;
1429
1430         unix_to_nt_time(&now, t);
1431
1432         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1433         if (ret != LDB_SUCCESS) {
1434                 talloc_free(tmp_ctx);
1435                 return ret;
1436         }
1437
1438         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1439         if (ret != LDB_SUCCESS) {
1440                 talloc_free(tmp_ctx);
1441                 return ret;
1442         }
1443
1444         invocation_id = samdb_ntds_invocation_id(ldb);
1445         if (!invocation_id) {
1446                 talloc_free(tmp_ctx);
1447                 return LDB_ERR_OPERATIONS_ERROR;
1448         }
1449
1450         ret = replmd_check_upgrade_links(old_dns, old_num_values, invocation_id);
1451         if (ret != LDB_SUCCESS) {
1452                 talloc_free(tmp_ctx);
1453                 return ret;
1454         }
1455
1456         /* for each new value, see if it exists already with the same GUID */
1457         for (i=0; i<el->num_values; i++) {
1458                 struct parsed_dn *p = parsed_dn_find(old_dns, old_num_values, dns[i].guid, NULL);
1459                 if (p == NULL) {
1460                         /* this is a new linked attribute value */
1461                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val, num_new_values+1);
1462                         if (new_values == NULL) {
1463                                 ldb_module_oom(module);
1464                                 talloc_free(tmp_ctx);
1465                                 return LDB_ERR_OPERATIONS_ERROR;
1466                         }
1467                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1468                                                   invocation_id, seq_num, seq_num, now, 0, false);
1469                         if (ret != LDB_SUCCESS) {
1470                                 talloc_free(tmp_ctx);
1471                                 return ret;
1472                         }
1473                         num_new_values++;
1474                 } else {
1475                         /* this is only allowed if the GUID was
1476                            previously deleted. */
1477                         const struct ldb_val *v;
1478                         v = ldb_dn_get_extended_component(p->dsdb_dn->dn, "DELETED");
1479                         if (v == NULL) {
1480                                 ldb_asprintf_errstring(ldb, "Attribute %s already exists for target GUID %s",
1481                                                        el->name, GUID_string(tmp_ctx, p->guid));
1482                                 talloc_free(tmp_ctx);
1483                                 return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
1484                         }
1485                         ret = replmd_update_la_val(old_el->values, p->v, dns[i].dsdb_dn, p->dsdb_dn,
1486                                                    invocation_id, seq_num, seq_num, now, 0, false);
1487                         if (ret != LDB_SUCCESS) {
1488                                 talloc_free(tmp_ctx);
1489                                 return ret;
1490                         }
1491                 }
1492
1493                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, true);
1494                 if (ret != LDB_SUCCESS) {
1495                         talloc_free(tmp_ctx);
1496                         return ret;
1497                 }
1498         }
1499
1500         /* add the new ones on to the end of the old values, constructing a new el->values */
1501         el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1502                                     struct ldb_val,
1503                                     old_num_values+num_new_values);
1504         if (el->values == NULL) {
1505                 ldb_module_oom(module);
1506                 return LDB_ERR_OPERATIONS_ERROR;
1507         }
1508
1509         memcpy(&el->values[old_num_values], new_values, num_new_values*sizeof(struct ldb_val));
1510         el->num_values = old_num_values + num_new_values;
1511
1512         talloc_steal(msg->elements, el->values);
1513         talloc_steal(el->values, new_values);
1514
1515         talloc_free(tmp_ctx);
1516
1517         /* we now tell the backend to replace all existing values
1518            with the one we have constructed */
1519         el->flags = LDB_FLAG_MOD_REPLACE;
1520
1521         return LDB_SUCCESS;
1522 }
1523
1524
1525 /*
1526   handle deleting all active linked attributes
1527  */
1528 static int replmd_modify_la_delete(struct ldb_module *module,
1529                                    struct dsdb_schema *schema,
1530                                    struct ldb_message *msg,
1531                                    struct ldb_message_element *el,
1532                                    struct ldb_message_element *old_el,
1533                                    const struct dsdb_attribute *schema_attr,
1534                                    uint64_t seq_num,
1535                                    time_t t,
1536                                    struct GUID *msg_guid)
1537 {
1538         int i;
1539         struct parsed_dn *dns, *old_dns;
1540         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1541         int ret;
1542         const struct GUID *invocation_id;
1543         struct ldb_context *ldb = ldb_module_get_ctx(module);
1544         NTTIME now;
1545
1546         unix_to_nt_time(&now, t);
1547
1548         /* check if there is nothing to delete */
1549         if ((!old_el || old_el->num_values == 0) &&
1550             el->num_values == 0) {
1551                 return LDB_SUCCESS;
1552         }
1553
1554         if (!old_el || old_el->num_values == 0) {
1555                 return LDB_ERR_NO_SUCH_ATTRIBUTE;
1556         }
1557
1558         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1559         if (ret != LDB_SUCCESS) {
1560                 talloc_free(tmp_ctx);
1561                 return ret;
1562         }
1563
1564         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1565         if (ret != LDB_SUCCESS) {
1566                 talloc_free(tmp_ctx);
1567                 return ret;
1568         }
1569
1570         invocation_id = samdb_ntds_invocation_id(ldb);
1571         if (!invocation_id) {
1572                 return LDB_ERR_OPERATIONS_ERROR;
1573         }
1574
1575         ret = replmd_check_upgrade_links(old_dns, old_el->num_values, invocation_id);
1576         if (ret != LDB_SUCCESS) {
1577                 talloc_free(tmp_ctx);
1578                 return ret;
1579         }
1580
1581         el->values = NULL;
1582
1583         /* see if we are being asked to delete any links that
1584            don't exist or are already deleted */
1585         for (i=0; i<el->num_values; i++) {
1586                 struct parsed_dn *p = &dns[i];
1587                 struct parsed_dn *p2;
1588                 const struct ldb_val *v;
1589
1590                 p2 = parsed_dn_find(old_dns, old_el->num_values, p->guid, NULL);
1591                 if (!p2) {
1592                         ldb_asprintf_errstring(ldb, "Attribute %s doesn't exist for target GUID %s",
1593                                                el->name, GUID_string(tmp_ctx, p->guid));
1594                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1595                 }
1596                 v = ldb_dn_get_extended_component(p2->dsdb_dn->dn, "DELETED");
1597                 if (v) {
1598                         ldb_asprintf_errstring(ldb, "Attribute %s already deleted for target GUID %s",
1599                                                el->name, GUID_string(tmp_ctx, p->guid));
1600                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1601                 }
1602         }
1603
1604         /* for each new value, see if it exists already with the same GUID
1605            if it is not already deleted and matches the delete list then delete it
1606         */
1607         for (i=0; i<old_el->num_values; i++) {
1608                 struct parsed_dn *p = &old_dns[i];
1609                 const struct ldb_val *v;
1610
1611                 if (el->num_values && parsed_dn_find(dns, el->num_values, p->guid, NULL) == NULL) {
1612                         continue;
1613                 }
1614
1615                 v = ldb_dn_get_extended_component(p->dsdb_dn->dn, "DELETED");
1616                 if (v != NULL) continue;
1617
1618                 ret = replmd_update_la_val(old_el->values, p->v, p->dsdb_dn, p->dsdb_dn,
1619                                            invocation_id, seq_num, seq_num, now, 0, true);
1620                 if (ret != LDB_SUCCESS) {
1621                         talloc_free(tmp_ctx);
1622                         return ret;
1623                 }
1624
1625                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, true);
1626                 if (ret != LDB_SUCCESS) {
1627                         talloc_free(tmp_ctx);
1628                         return ret;
1629                 }
1630         }
1631
1632         el->values = talloc_steal(msg->elements, old_el->values);
1633         el->num_values = old_el->num_values;
1634
1635         talloc_free(tmp_ctx);
1636
1637         /* we now tell the backend to replace all existing values
1638            with the one we have constructed */
1639         el->flags = LDB_FLAG_MOD_REPLACE;
1640
1641         return LDB_SUCCESS;
1642 }
1643
1644 /*
1645   handle replacing a linked attribute
1646  */
1647 static int replmd_modify_la_replace(struct ldb_module *module,
1648                                     struct dsdb_schema *schema,
1649                                     struct ldb_message *msg,
1650                                     struct ldb_message_element *el,
1651                                     struct ldb_message_element *old_el,
1652                                     const struct dsdb_attribute *schema_attr,
1653                                     uint64_t seq_num,
1654                                     time_t t,
1655                                     struct GUID *msg_guid)
1656 {
1657         int i;
1658         struct parsed_dn *dns, *old_dns;
1659         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1660         int ret;
1661         const struct GUID *invocation_id;
1662         struct ldb_context *ldb = ldb_module_get_ctx(module);
1663         struct ldb_val *new_values = NULL;
1664         uint32_t num_new_values = 0;
1665         unsigned old_num_values = old_el?old_el->num_values:0;
1666         NTTIME now;
1667
1668         unix_to_nt_time(&now, t);
1669
1670         /* check if there is nothing to replace */
1671         if ((!old_el || old_el->num_values == 0) &&
1672             el->num_values == 0) {
1673                 return LDB_SUCCESS;
1674         }
1675
1676         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1677         if (ret != LDB_SUCCESS) {
1678                 talloc_free(tmp_ctx);
1679                 return ret;
1680         }
1681
1682         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1683         if (ret != LDB_SUCCESS) {
1684                 talloc_free(tmp_ctx);
1685                 return ret;
1686         }
1687
1688         invocation_id = samdb_ntds_invocation_id(ldb);
1689         if (!invocation_id) {
1690                 return LDB_ERR_OPERATIONS_ERROR;
1691         }
1692
1693         ret = replmd_check_upgrade_links(old_dns, old_num_values, invocation_id);
1694         if (ret != LDB_SUCCESS) {
1695                 talloc_free(tmp_ctx);
1696                 return ret;
1697         }
1698
1699         /* mark all the old ones as deleted */
1700         for (i=0; i<old_num_values; i++) {
1701                 struct parsed_dn *old_p = &old_dns[i];
1702                 struct parsed_dn *p;
1703                 const struct ldb_val *v;
1704
1705                 v = ldb_dn_get_extended_component(old_p->dsdb_dn->dn, "DELETED");
1706                 if (v) continue;
1707
1708                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, false);
1709                 if (ret != LDB_SUCCESS) {
1710                         talloc_free(tmp_ctx);
1711                         return ret;
1712                 }
1713
1714                 p = parsed_dn_find(dns, el->num_values, old_p->guid, NULL);
1715                 if (p) {
1716                         /* we don't delete it if we are re-adding it */
1717                         continue;
1718                 }
1719
1720                 ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn, old_p->dsdb_dn,
1721                                            invocation_id, seq_num, seq_num, now, 0, true);
1722                 if (ret != LDB_SUCCESS) {
1723                         talloc_free(tmp_ctx);
1724                         return ret;
1725                 }
1726         }
1727
1728         /* for each new value, either update its meta-data, or add it
1729          * to old_el
1730         */
1731         for (i=0; i<el->num_values; i++) {
1732                 struct parsed_dn *p = &dns[i], *old_p;
1733
1734                 if (old_dns &&
1735                     (old_p = parsed_dn_find(old_dns,
1736                                             old_num_values, p->guid, NULL)) != NULL) {
1737                         /* update in place */
1738                         ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn,
1739                                                    old_p->dsdb_dn, invocation_id,
1740                                                    seq_num, seq_num, now, 0, false);
1741                         if (ret != LDB_SUCCESS) {
1742                                 talloc_free(tmp_ctx);
1743                                 return ret;
1744                         }
1745                 } else {
1746                         /* add a new one */
1747                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val,
1748                                                     num_new_values+1);
1749                         if (new_values == NULL) {
1750                                 ldb_module_oom(module);
1751                                 talloc_free(tmp_ctx);
1752                                 return LDB_ERR_OPERATIONS_ERROR;
1753                         }
1754                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1755                                                   invocation_id, seq_num, seq_num, now, 0, false);
1756                         if (ret != LDB_SUCCESS) {
1757                                 talloc_free(tmp_ctx);
1758                                 return ret;
1759                         }
1760                         num_new_values++;
1761                 }
1762
1763                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, false);
1764                 if (ret != LDB_SUCCESS) {
1765                         talloc_free(tmp_ctx);
1766                         return ret;
1767                 }
1768         }
1769
1770         /* add the new values to the end of old_el */
1771         if (num_new_values != 0) {
1772                 el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1773                                             struct ldb_val, old_num_values+num_new_values);
1774                 if (el->values == NULL) {
1775                         ldb_module_oom(module);
1776                         return LDB_ERR_OPERATIONS_ERROR;
1777                 }
1778                 memcpy(&el->values[old_num_values], &new_values[0],
1779                        sizeof(struct ldb_val)*num_new_values);
1780                 el->num_values = old_num_values + num_new_values;
1781                 talloc_steal(msg->elements, new_values);
1782         } else {
1783                 el->values = old_el->values;
1784                 el->num_values = old_el->num_values;
1785                 talloc_steal(msg->elements, el->values);
1786         }
1787
1788         talloc_free(tmp_ctx);
1789
1790         /* we now tell the backend to replace all existing values
1791            with the one we have constructed */
1792         el->flags = LDB_FLAG_MOD_REPLACE;
1793
1794         return LDB_SUCCESS;
1795 }
1796
1797
1798 /*
1799   handle linked attributes in modify requests
1800  */
1801 static int replmd_modify_handle_linked_attribs(struct ldb_module *module,
1802                                                struct ldb_message *msg,
1803                                                uint64_t seq_num, time_t t)
1804 {
1805         struct ldb_result *res;
1806         int ret, i;
1807         struct ldb_context *ldb = ldb_module_get_ctx(module);
1808         struct ldb_message *old_msg;
1809         struct dsdb_schema *schema = dsdb_get_schema(ldb);
1810         struct GUID old_guid;
1811
1812         if (seq_num == 0) {
1813                 /* there the replmd_update_rpmd code has already
1814                  * checked and saw that there are no linked
1815                  * attributes */
1816                 return LDB_SUCCESS;
1817         }
1818
1819 #if !W2K3_LINKED_ATTRIBUTES
1820         return LDB_SUCCESS;
1821 #endif
1822
1823         if (dsdb_functional_level(ldb) == DS_DOMAIN_FUNCTION_2000) {
1824                 /* don't do anything special for linked attributes */
1825                 return LDB_SUCCESS;
1826         }
1827
1828         ret = dsdb_module_search_dn(module, msg, &res, msg->dn, NULL,
1829                                     DSDB_SEARCH_SHOW_DELETED |
1830                                     DSDB_SEARCH_REVEAL_INTERNALS |
1831                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
1832         if (ret != LDB_SUCCESS) {
1833                 return ret;
1834         }
1835         old_msg = res->msgs[0];
1836
1837         old_guid = samdb_result_guid(old_msg, "objectGUID");
1838
1839         for (i=0; i<msg->num_elements; i++) {
1840                 struct ldb_message_element *el = &msg->elements[i];
1841                 struct ldb_message_element *old_el, *new_el;
1842                 const struct dsdb_attribute *schema_attr
1843                         = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
1844                 if (!schema_attr) {
1845                         ldb_asprintf_errstring(ldb,
1846                                                "attribute %s is not a valid attribute in schema", el->name);
1847                         return LDB_ERR_OBJECT_CLASS_VIOLATION;
1848                 }
1849                 if (schema_attr->linkID == 0) {
1850                         continue;
1851                 }
1852                 if ((schema_attr->linkID & 1) == 1) {
1853                         /* Odd is for the target.  Illegal to modify */
1854                         ldb_asprintf_errstring(ldb,
1855                                                "attribute %s must not be modified directly, it is a linked attribute", el->name);
1856                         return LDB_ERR_UNWILLING_TO_PERFORM;
1857                 }
1858                 old_el = ldb_msg_find_element(old_msg, el->name);
1859                 switch (el->flags & LDB_FLAG_MOD_MASK) {
1860                 case LDB_FLAG_MOD_REPLACE:
1861                         ret = replmd_modify_la_replace(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
1862                         break;
1863                 case LDB_FLAG_MOD_DELETE:
1864                         ret = replmd_modify_la_delete(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
1865                         break;
1866                 case LDB_FLAG_MOD_ADD:
1867                         ret = replmd_modify_la_add(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
1868                         break;
1869                 default:
1870                         ldb_asprintf_errstring(ldb,
1871                                                "invalid flags 0x%x for %s linked attribute",
1872                                                el->flags, el->name);
1873                         return LDB_ERR_UNWILLING_TO_PERFORM;
1874                 }
1875                 if (ret != LDB_SUCCESS) {
1876                         return ret;
1877                 }
1878                 if (old_el) {
1879                         ldb_msg_remove_attr(old_msg, el->name);
1880                 }
1881                 ldb_msg_add_empty(old_msg, el->name, 0, &new_el);
1882                 new_el->num_values = el->num_values;
1883                 new_el->values = el->values;
1884
1885                 /* TODO: this relises a bit too heavily on the exact
1886                    behaviour of ldb_msg_find_element and
1887                    ldb_msg_remove_element */
1888                 old_el = ldb_msg_find_element(msg, el->name);
1889                 if (old_el != el) {
1890                         ldb_msg_remove_element(msg, old_el);
1891                         i--;
1892                 }
1893         }
1894
1895         talloc_free(res);
1896         return ret;
1897 }
1898
1899
1900
1901 static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
1902 {
1903         struct ldb_context *ldb;
1904         struct replmd_replicated_request *ac;
1905         struct ldb_request *down_req;
1906         struct ldb_message *msg;
1907         time_t t = time(NULL);
1908         int ret;
1909
1910         /* do not manipulate our control entries */
1911         if (ldb_dn_is_special(req->op.mod.message->dn)) {
1912                 return ldb_next_request(module, req);
1913         }
1914
1915         ldb = ldb_module_get_ctx(module);
1916
1917         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_modify\n");
1918
1919         ac = replmd_ctx_init(module, req);
1920         if (!ac) {
1921                 return LDB_ERR_OPERATIONS_ERROR;
1922         }
1923
1924         /* we have to copy the message as the caller might have it as a const */
1925         msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
1926         if (msg == NULL) {
1927                 ldb_oom(ldb);
1928                 talloc_free(ac);
1929                 return LDB_ERR_OPERATIONS_ERROR;
1930         }
1931
1932         ret = replmd_update_rpmd(module, ac->schema, msg, &ac->seq_num, t);
1933         if (ret != LDB_SUCCESS) {
1934                 talloc_free(ac);
1935                 return ret;
1936         }
1937
1938         ret = replmd_modify_handle_linked_attribs(module, msg, ac->seq_num, t);
1939         if (ret != LDB_SUCCESS) {
1940                 talloc_free(ac);
1941                 return ret;
1942         }
1943
1944         /* TODO:
1945          * - replace the old object with the newly constructed one
1946          */
1947
1948         ret = ldb_build_mod_req(&down_req, ldb, ac,
1949                                 msg,
1950                                 req->controls,
1951                                 ac, replmd_op_callback,
1952                                 req);
1953         if (ret != LDB_SUCCESS) {
1954                 talloc_free(ac);
1955                 return ret;
1956         }
1957         talloc_steal(down_req, msg);
1958
1959         /* we only change whenChanged and uSNChanged if the seq_num
1960            has changed */
1961         if (ac->seq_num != 0) {
1962                 if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
1963                         talloc_free(ac);
1964                         return ret;
1965                 }
1966
1967                 if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
1968                         talloc_free(ac);
1969                         return ret;
1970                 }
1971         }
1972
1973         /* go on with the call chain */
1974         return ldb_next_request(module, down_req);
1975 }
1976
1977 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares);
1978
1979 /*
1980   handle a rename request
1981
1982   On a rename we need to do an extra ldb_modify which sets the
1983   whenChanged and uSNChanged attributes.  We do this in a callback after the success.
1984  */
1985 static int replmd_rename(struct ldb_module *module, struct ldb_request *req)
1986 {
1987         struct ldb_context *ldb;
1988         struct replmd_replicated_request *ac;
1989         int ret;
1990         struct ldb_request *down_req;
1991
1992         /* do not manipulate our control entries */
1993         if (ldb_dn_is_special(req->op.mod.message->dn)) {
1994                 return ldb_next_request(module, req);
1995         }
1996
1997         ldb = ldb_module_get_ctx(module);
1998
1999         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_rename\n");
2000
2001         ac = replmd_ctx_init(module, req);
2002         if (!ac) {
2003                 return LDB_ERR_OPERATIONS_ERROR;
2004         }
2005         ret = ldb_build_rename_req(&down_req, ldb, ac,
2006                                    ac->req->op.rename.olddn,
2007                                    ac->req->op.rename.newdn,
2008                                    ac->req->controls,
2009                                    ac, replmd_rename_callback,
2010                                    ac->req);
2011
2012         if (ret != LDB_SUCCESS) {
2013                 talloc_free(ac);
2014                 return ret;
2015         }
2016
2017         /* go on with the call chain */
2018         return ldb_next_request(module, down_req);
2019 }
2020
2021 /* After the rename is compleated, update the whenchanged etc */
2022 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares)
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
2031         ac = talloc_get_type(req->context, struct replmd_replicated_request);
2032         ldb = ldb_module_get_ctx(ac->module);
2033
2034         if (ares->error != LDB_SUCCESS) {
2035                 return ldb_module_done(ac->req, ares->controls,
2036                                         ares->response, ares->error);
2037         }
2038
2039         if (ares->type != LDB_REPLY_DONE) {
2040                 ldb_set_errstring(ldb,
2041                                   "invalid ldb_reply_type in callback");
2042                 talloc_free(ares);
2043                 return ldb_module_done(ac->req, NULL, NULL,
2044                                         LDB_ERR_OPERATIONS_ERROR);
2045         }
2046
2047         /* Get a sequence number from the backend */
2048         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
2049         if (ret != LDB_SUCCESS) {
2050                 return ret;
2051         }
2052
2053         /* TODO:
2054          * - replace the old object with the newly constructed one
2055          */
2056
2057         msg = ldb_msg_new(ac);
2058         if (msg == NULL) {
2059                 ldb_oom(ldb);
2060                 return LDB_ERR_OPERATIONS_ERROR;
2061         }
2062
2063         msg->dn = ac->req->op.rename.newdn;
2064
2065         ret = ldb_build_mod_req(&down_req, ldb, ac,
2066                                 msg,
2067                                 req->controls,
2068                                 ac, replmd_op_callback,
2069                                 req);
2070
2071         if (ret != LDB_SUCCESS) {
2072                 talloc_free(ac);
2073                 return ret;
2074         }
2075         talloc_steal(down_req, msg);
2076
2077         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
2078                 talloc_free(ac);
2079                 return ret;
2080         }
2081
2082         if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
2083                 talloc_free(ac);
2084                 return ret;
2085         }
2086
2087         /* go on with the call chain - do the modify after the rename */
2088         return ldb_next_request(ac->module, down_req);
2089 }
2090
2091 /* remove forwards and backlinks as needed when an object
2092    is deleted */
2093 static int replmd_delete_remove_link(struct ldb_module *module,
2094                                      struct dsdb_schema *schema,
2095                                      struct ldb_dn *dn,
2096                                      struct ldb_message_element *el,
2097                                      const struct dsdb_attribute *sa)
2098 {
2099         int i;
2100         TALLOC_CTX *tmp_ctx = talloc_new(module);
2101         struct ldb_context *ldb = ldb_module_get_ctx(module);
2102
2103         for (i=0; i<el->num_values; i++) {
2104                 struct dsdb_dn *dsdb_dn;
2105                 NTSTATUS status;
2106                 int ret;
2107                 struct GUID guid2;
2108                 struct ldb_message *msg;
2109                 const struct dsdb_attribute *target_attr;
2110                 struct ldb_message_element *el2;
2111                 struct ldb_val dn_val;
2112
2113                 if (dsdb_dn_is_deleted_val(&el->values[i])) {
2114                         continue;
2115                 }
2116
2117                 dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &el->values[i], sa->syntax->ldap_oid);
2118                 if (!dsdb_dn) {
2119                         talloc_free(tmp_ctx);
2120                         return LDB_ERR_OPERATIONS_ERROR;
2121                 }
2122
2123                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid2, "GUID");
2124                 if (!NT_STATUS_IS_OK(status)) {
2125                         talloc_free(tmp_ctx);
2126                         return LDB_ERR_OPERATIONS_ERROR;
2127                 }
2128
2129                 /* remove the link */
2130                 msg = ldb_msg_new(tmp_ctx);
2131                 if (!msg) {
2132                         ldb_module_oom(module);
2133                         talloc_free(tmp_ctx);
2134                         return LDB_ERR_OPERATIONS_ERROR;
2135                 }
2136
2137
2138                 msg->dn = dsdb_dn->dn;
2139
2140                 target_attr = dsdb_attribute_by_linkID(schema, sa->linkID ^ 1);
2141                 if (target_attr == NULL) {
2142                         continue;
2143                 }
2144
2145                 ret = ldb_msg_add_empty(msg, target_attr->lDAPDisplayName, LDB_FLAG_MOD_DELETE, &el2);
2146                 if (ret != LDB_SUCCESS) {
2147                         ldb_module_oom(module);
2148                         talloc_free(tmp_ctx);
2149                         return LDB_ERR_OPERATIONS_ERROR;
2150                 }
2151                 dn_val = data_blob_string_const(ldb_dn_get_linearized(dn));
2152                 el2->values = &dn_val;
2153                 el2->num_values = 1;
2154
2155                 ret = dsdb_module_modify(module, msg, 0);
2156                 if (ret != LDB_SUCCESS) {
2157                         talloc_free(tmp_ctx);
2158                         return ret;
2159                 }
2160         }
2161         talloc_free(tmp_ctx);
2162         return LDB_SUCCESS;
2163 }
2164
2165
2166 /*
2167   handle update of replication meta data for deletion of objects
2168
2169   This also handles the mapping of delete to a rename operation
2170   to allow deletes to be replicated.
2171  */
2172 static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
2173 {
2174         int ret = LDB_ERR_OTHER;
2175         bool retb;
2176         struct ldb_dn *old_dn, *new_dn;
2177         const char *rdn_name;
2178         const struct ldb_val *rdn_value, *new_rdn_value;
2179         struct GUID guid;
2180         struct ldb_context *ldb = ldb_module_get_ctx(module);
2181         struct dsdb_schema *schema = dsdb_get_schema(ldb);
2182         struct ldb_message *msg, *old_msg;
2183         struct ldb_message_element *el;
2184         TALLOC_CTX *tmp_ctx;
2185         struct ldb_result *res, *parent_res;
2186         const char *preserved_attrs[] = {
2187                 /* yes, this really is a hard coded list. See MS-ADTS
2188                    section 3.1.1.5.5.1.1 */
2189                 "nTSecurityDescriptor", "attributeID", "attributeSyntax", "dNReferenceUpdate", "dNSHostName",
2190                 "flatName", "governsID", "groupType", "instanceType", "lDAPDisplayName", "legacyExchangeDN",
2191                 "isDeleted", "isRecycled", "lastKnownParent", "msDS-LastKnownRDN", "mS-DS-CreatorSID",
2192                 "mSMQOwnerID", "nCName", "objectClass", "distinguishedName", "objectGUID", "objectSid",
2193                 "oMSyntax", "proxiedObjectName", "name", "replPropertyMetaData", "sAMAccountName",
2194                 "securityIdentifier", "sIDHistory", "subClassOf", "systemFlags", "trustPartner", "trustDirection",
2195                 "trustType", "trustAttributes", "userAccountControl", "uSNChanged", "uSNCreated", "whenCreate",
2196                 NULL};
2197         uint32_t el_count = 0;
2198         int i;
2199
2200         tmp_ctx = talloc_new(ldb);
2201
2202         old_dn = ldb_dn_copy(tmp_ctx, req->op.del.dn);
2203
2204         /* we need the complete msg off disk, so we can work out which
2205            attributes need to be removed */
2206         ret = dsdb_module_search_dn(module, tmp_ctx, &res, old_dn, NULL,
2207                                     DSDB_SEARCH_SHOW_DELETED |
2208                                     DSDB_SEARCH_REVEAL_INTERNALS |
2209                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
2210         if (ret != LDB_SUCCESS) {
2211                 talloc_free(tmp_ctx);
2212                 return ret;
2213         }
2214         old_msg = res->msgs[0];
2215
2216         /* work out where we will be renaming this object to */
2217         ret = dsdb_get_deleted_objects_dn(ldb, tmp_ctx, old_dn, &new_dn);
2218         if (ret != LDB_SUCCESS) {
2219                 /* this is probably an attempted delete on a partition
2220                  * that doesn't allow delete operations, such as the
2221                  * schema partition */
2222                 ldb_asprintf_errstring(ldb, "No Deleted Objects container for DN %s",
2223                                        ldb_dn_get_linearized(old_dn));
2224                 talloc_free(tmp_ctx);
2225                 return LDB_ERR_UNWILLING_TO_PERFORM;
2226         }
2227
2228         rdn_name = ldb_dn_get_rdn_name(old_dn);
2229         rdn_value = ldb_dn_get_rdn_val(old_dn);
2230
2231         /* get the objects GUID from the search we just did */
2232         guid = samdb_result_guid(old_msg, "objectGUID");
2233
2234         /* Add a formatted child */
2235         retb = ldb_dn_add_child_fmt(new_dn, "%s=%s\\0ADEL:%s",
2236                                     rdn_name,
2237                                     rdn_value->data,
2238                                     GUID_string(tmp_ctx, &guid));
2239         if (!retb) {
2240                 DEBUG(0,(__location__ ": Unable to add a formatted child to dn: %s",
2241                                 ldb_dn_get_linearized(new_dn)));
2242                 talloc_free(tmp_ctx);
2243                 return LDB_ERR_OPERATIONS_ERROR;
2244         }
2245
2246         /*
2247           now we need to modify the object in the following ways:
2248
2249           - add isDeleted=TRUE
2250           - update rDN and name, with new rDN
2251           - remove linked attributes
2252           - remove objectCategory and sAMAccountType
2253           - remove attribs not on the preserved list
2254              - preserved if in above list, or is rDN
2255           - remove all linked attribs from this object
2256           - remove all links from other objects to this object
2257           - add lastKnownParent
2258           - update replPropertyMetaData?
2259
2260           see MS-ADTS "Tombstone Requirements" section 3.1.1.5.5.1.1
2261          */
2262
2263         msg = ldb_msg_new(tmp_ctx);
2264         if (msg == NULL) {
2265                 ldb_module_oom(module);
2266                 talloc_free(tmp_ctx);
2267                 return LDB_ERR_OPERATIONS_ERROR;
2268         }
2269
2270         msg->dn = old_dn;
2271
2272         ret = ldb_msg_add_string(msg, "isDeleted", "TRUE");
2273         if (ret != LDB_SUCCESS) {
2274                 DEBUG(0,(__location__ ": Failed to add isDeleted string to the msg\n"));
2275                 ldb_module_oom(module);
2276                 talloc_free(tmp_ctx);
2277                 return ret;
2278         }
2279         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2280
2281         /* we need the storage form of the parent GUID */
2282         ret = dsdb_module_search_dn(module, tmp_ctx, &parent_res,
2283                                     ldb_dn_get_parent(tmp_ctx, old_dn), NULL,
2284                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
2285                                     DSDB_SEARCH_REVEAL_INTERNALS);
2286         if (ret != LDB_SUCCESS) {
2287                 talloc_free(tmp_ctx);
2288                 return ret;
2289         }
2290
2291         ret = ldb_msg_add_steal_string(msg, "lastKnownParent",
2292                                        ldb_dn_get_extended_linearized(tmp_ctx, parent_res->msgs[0]->dn, 1));
2293         if (ret != LDB_SUCCESS) {
2294                 DEBUG(0,(__location__ ": Failed to add lastKnownParent string to the msg\n"));
2295                 ldb_module_oom(module);
2296                 talloc_free(tmp_ctx);
2297                 return ret;
2298         }
2299         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2300
2301         /* work out which of the old attributes we will be removing */
2302         for (i=0; i<old_msg->num_elements; i++) {
2303                 const struct dsdb_attribute *sa;
2304                 el = &old_msg->elements[i];
2305                 sa = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
2306                 if (!sa) {
2307                         talloc_free(tmp_ctx);
2308                         return LDB_ERR_OPERATIONS_ERROR;
2309                 }
2310                 if (ldb_attr_cmp(el->name, rdn_name) == 0) {
2311                         /* don't remove the rDN */
2312                         continue;
2313                 }
2314
2315                 if (sa->linkID) {
2316                         ret = replmd_delete_remove_link(module, schema, old_dn, el, sa);
2317                         if (ret != LDB_SUCCESS) {
2318                                 talloc_free(tmp_ctx);
2319                                 return LDB_ERR_OPERATIONS_ERROR;
2320                         }
2321                 }
2322
2323                 if (!sa->linkID && ldb_attr_in_list(preserved_attrs, el->name)) {
2324                         continue;
2325                 }
2326
2327                 ret = ldb_msg_add_empty(msg, el->name, LDB_FLAG_MOD_DELETE, &el);
2328                 if (ret != LDB_SUCCESS) {
2329                         talloc_free(tmp_ctx);
2330                         ldb_module_oom(module);
2331                         return ret;
2332                 }
2333         }
2334
2335         /* work out what the new rdn value is, for updating the
2336            rDN and name fields */
2337         new_rdn_value = ldb_dn_get_rdn_val(new_dn);
2338         ret = ldb_msg_add_value(msg, rdn_name, new_rdn_value, &el);
2339         if (ret != LDB_SUCCESS) {
2340                 talloc_free(tmp_ctx);
2341                 return ret;
2342         }
2343         el->flags = LDB_FLAG_MOD_REPLACE;
2344
2345         el = ldb_msg_find_element(old_msg, "name");
2346         if (el) {
2347                 ret = ldb_msg_add_value(msg, "name", new_rdn_value, &el);
2348                 if (ret != LDB_SUCCESS) {
2349                         talloc_free(tmp_ctx);
2350                         return ret;
2351                 }
2352                 el->flags = LDB_FLAG_MOD_REPLACE;
2353         }
2354
2355         ret = dsdb_module_modify(module, msg, 0);
2356         if (ret != LDB_SUCCESS){
2357                 ldb_asprintf_errstring(ldb, "replmd_delete: Failed to modify object %s in delete - %s",
2358                                        ldb_dn_get_linearized(old_dn), ldb_errstring(ldb));
2359                 talloc_free(tmp_ctx);
2360                 return ret;
2361         }
2362
2363         /* now rename onto the new DN */
2364         ret = dsdb_module_rename(module, old_dn, new_dn, 0);
2365         if (ret != LDB_SUCCESS){
2366                 DEBUG(0,(__location__ ": Failed to rename object from '%s' to '%s' - %s\n",
2367                          ldb_dn_get_linearized(old_dn),
2368                          ldb_dn_get_linearized(new_dn),
2369                          ldb_errstring(ldb)));
2370                 talloc_free(tmp_ctx);
2371                 return ret;
2372         }
2373
2374         talloc_free(tmp_ctx);
2375
2376         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
2377 }
2378
2379
2380
2381 static int replmd_replicated_request_error(struct replmd_replicated_request *ar, int ret)
2382 {
2383         return ret;
2384 }
2385
2386 static int replmd_replicated_request_werror(struct replmd_replicated_request *ar, WERROR status)
2387 {
2388         int ret = LDB_ERR_OTHER;
2389         /* TODO: do some error mapping */
2390         return ret;
2391 }
2392
2393 static int replmd_replicated_apply_add(struct replmd_replicated_request *ar)
2394 {
2395         struct ldb_context *ldb;
2396         struct ldb_request *change_req;
2397         enum ndr_err_code ndr_err;
2398         struct ldb_message *msg;
2399         struct replPropertyMetaDataBlob *md;
2400         struct ldb_val md_value;
2401         uint32_t i;
2402         int ret;
2403
2404         /*
2405          * TODO: check if the parent object exist
2406          */
2407
2408         /*
2409          * TODO: handle the conflict case where an object with the
2410          *       same name exist
2411          */
2412
2413         ldb = ldb_module_get_ctx(ar->module);
2414         msg = ar->objs->objects[ar->index_current].msg;
2415         md = ar->objs->objects[ar->index_current].meta_data;
2416
2417         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2418         if (ret != LDB_SUCCESS) {
2419                 return replmd_replicated_request_error(ar, ret);
2420         }
2421
2422         ret = ldb_msg_add_value(msg, "objectGUID", &ar->objs->objects[ar->index_current].guid_value, NULL);
2423         if (ret != LDB_SUCCESS) {
2424                 return replmd_replicated_request_error(ar, ret);
2425         }
2426
2427         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2428         if (ret != LDB_SUCCESS) {
2429                 return replmd_replicated_request_error(ar, ret);
2430         }
2431
2432         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ar->seq_num);
2433         if (ret != LDB_SUCCESS) {
2434                 return replmd_replicated_request_error(ar, ret);
2435         }
2436
2437         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2438         if (ret != LDB_SUCCESS) {
2439                 return replmd_replicated_request_error(ar, ret);
2440         }
2441
2442         /* remove any message elements that have zero values */
2443         for (i=0; i<msg->num_elements; i++) {
2444                 struct ldb_message_element *el = &msg->elements[i];
2445
2446                 if (el->num_values == 0) {
2447                         DEBUG(4,(__location__ ": Removing attribute %s with num_values==0\n",
2448                                  el->name));
2449                         memmove(el, el+1, sizeof(*el)*(msg->num_elements - (i+1)));
2450                         msg->num_elements--;
2451                         i--;
2452                         continue;
2453                 }
2454         }
2455
2456         /*
2457          * the meta data array is already sorted by the caller
2458          */
2459         for (i=0; i < md->ctr.ctr1.count; i++) {
2460                 md->ctr.ctr1.array[i].local_usn = ar->seq_num;
2461         }
2462         ndr_err = ndr_push_struct_blob(&md_value, msg,
2463                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
2464                                        md,
2465                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2466         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2467                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2468                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2469         }
2470         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &md_value, NULL);
2471         if (ret != LDB_SUCCESS) {
2472                 return replmd_replicated_request_error(ar, ret);
2473         }
2474
2475         replmd_ldb_message_sort(msg, ar->schema);
2476
2477         if (DEBUGLVL(4)) {
2478                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_ADD, msg);
2479                 DEBUG(4, ("DRS replication add message:\n%s\n", s));
2480                 talloc_free(s);
2481         }
2482
2483         ret = ldb_build_add_req(&change_req,
2484                                 ldb,
2485                                 ar,
2486                                 msg,
2487                                 ar->controls,
2488                                 ar,
2489                                 replmd_op_callback,
2490                                 ar->req);
2491         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2492
2493         return ldb_next_request(ar->module, change_req);
2494 }
2495
2496 /*
2497    return true if an update is newer than an existing entry
2498    see section 5.11 of MS-ADTS
2499 */
2500 static bool replmd_update_is_newer(const struct GUID *current_invocation_id,
2501                                    const struct GUID *update_invocation_id,
2502                                    uint32_t current_version,
2503                                    uint32_t update_version,
2504                                    NTTIME current_change_time,
2505                                    NTTIME update_change_time)
2506 {
2507         if (update_version != current_version) {
2508                 return update_version > current_version;
2509         }
2510         if (update_change_time > current_change_time) {
2511                 return true;
2512         }
2513         if (update_change_time == current_change_time) {
2514                 return GUID_compare(update_invocation_id, current_invocation_id) > 0;
2515         }
2516         return false;
2517 }
2518
2519 static bool replmd_replPropertyMetaData1_is_newer(struct replPropertyMetaData1 *cur_m,
2520                                                   struct replPropertyMetaData1 *new_m)
2521 {
2522         return replmd_update_is_newer(&cur_m->originating_invocation_id,
2523                                       &new_m->originating_invocation_id,
2524                                       cur_m->version,
2525                                       new_m->version,
2526                                       cur_m->originating_change_time,
2527                                       new_m->originating_change_time);
2528 }
2529
2530 static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
2531 {
2532         struct ldb_context *ldb;
2533         struct ldb_request *change_req;
2534         enum ndr_err_code ndr_err;
2535         struct ldb_message *msg;
2536         struct replPropertyMetaDataBlob *rmd;
2537         struct replPropertyMetaDataBlob omd;
2538         const struct ldb_val *omd_value;
2539         struct replPropertyMetaDataBlob nmd;
2540         struct ldb_val nmd_value;
2541         uint32_t i,j,ni=0;
2542         uint32_t removed_attrs = 0;
2543         int ret;
2544
2545         ldb = ldb_module_get_ctx(ar->module);
2546         msg = ar->objs->objects[ar->index_current].msg;
2547         rmd = ar->objs->objects[ar->index_current].meta_data;
2548         ZERO_STRUCT(omd);
2549         omd.version = 1;
2550
2551         /*
2552          * TODO: check repl data is correct after a rename
2553          */
2554         if (ldb_dn_compare(msg->dn, ar->search_msg->dn) != 0) {
2555                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_request rename %s => %s\n",
2556                           ldb_dn_get_linearized(ar->search_msg->dn),
2557                           ldb_dn_get_linearized(msg->dn));
2558                 /* we can't use dsdb_module_rename() here as we need
2559                    the rename call to be intercepted by this module, to
2560                    allow it to process linked attribute changes */
2561                 if (ldb_rename(ldb, ar->search_msg->dn, msg->dn) != LDB_SUCCESS) {
2562                         ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_replicated_request rename %s => %s failed - %s\n",
2563                                   ldb_dn_get_linearized(ar->search_msg->dn),
2564                                   ldb_dn_get_linearized(msg->dn),
2565                                   ldb_errstring(ldb));
2566                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_DB_ERROR);
2567                 }
2568         }
2569
2570         /* find existing meta data */
2571         omd_value = ldb_msg_find_ldb_val(ar->search_msg, "replPropertyMetaData");
2572         if (omd_value) {
2573                 ndr_err = ndr_pull_struct_blob(omd_value, ar,
2574                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &omd,
2575                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
2576                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2577                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2578                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2579                 }
2580
2581                 if (omd.version != 1) {
2582                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
2583                 }
2584         }
2585
2586         ZERO_STRUCT(nmd);
2587         nmd.version = 1;
2588         nmd.ctr.ctr1.count = omd.ctr.ctr1.count + rmd->ctr.ctr1.count;
2589         nmd.ctr.ctr1.array = talloc_array(ar,
2590                                           struct replPropertyMetaData1,
2591                                           nmd.ctr.ctr1.count);
2592         if (!nmd.ctr.ctr1.array) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2593
2594         /* first copy the old meta data */
2595         for (i=0; i < omd.ctr.ctr1.count; i++) {
2596                 nmd.ctr.ctr1.array[ni]  = omd.ctr.ctr1.array[i];
2597                 ni++;
2598         }
2599
2600         /* now merge in the new meta data */
2601         for (i=0; i < rmd->ctr.ctr1.count; i++) {
2602                 bool found = false;
2603
2604                 for (j=0; j < ni; j++) {
2605                         bool cmp;
2606
2607                         if (rmd->ctr.ctr1.array[i].attid != nmd.ctr.ctr1.array[j].attid) {
2608                                 continue;
2609                         }
2610
2611                         cmp = replmd_replPropertyMetaData1_is_newer(&nmd.ctr.ctr1.array[j],
2612                                                                     &rmd->ctr.ctr1.array[i]);
2613                         if (cmp) {
2614                                 /* replace the entry */
2615                                 nmd.ctr.ctr1.array[j] = rmd->ctr.ctr1.array[i];
2616                                 found = true;
2617                                 break;
2618                         }
2619
2620                         DEBUG(1,("Discarding older DRS attribute update to %s on %s from %s\n",
2621                                  msg->elements[i-removed_attrs].name,
2622                                  ldb_dn_get_linearized(msg->dn),
2623                                  GUID_string(ar, &rmd->ctr.ctr1.array[i].originating_invocation_id)));
2624
2625                         /* we don't want to apply this change so remove the attribute */
2626                         ldb_msg_remove_element(msg, &msg->elements[i-removed_attrs]);
2627                         removed_attrs++;
2628
2629                         found = true;
2630                         break;
2631                 }
2632
2633                 if (found) continue;
2634
2635                 nmd.ctr.ctr1.array[ni] = rmd->ctr.ctr1.array[i];
2636                 ni++;
2637         }
2638
2639         /*
2640          * finally correct the size of the meta_data array
2641          */
2642         nmd.ctr.ctr1.count = ni;
2643
2644         /*
2645          * the rdn attribute (the alias for the name attribute),
2646          * 'cn' for most objects is the last entry in the meta data array
2647          * we have stored
2648          *
2649          * sort the new meta data array
2650          */
2651         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ar->schema, msg->dn);
2652         if (ret != LDB_SUCCESS) {
2653                 return ret;
2654         }
2655
2656         /*
2657          * check if some replicated attributes left, otherwise skip the ldb_modify() call
2658          */
2659         if (msg->num_elements == 0) {
2660                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: skip replace\n",
2661                           ar->index_current);
2662
2663                 ar->index_current++;
2664                 return replmd_replicated_apply_next(ar);
2665         }
2666
2667         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: replace %u attributes\n",
2668                   ar->index_current, msg->num_elements);
2669
2670         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2671         if (ret != LDB_SUCCESS) {
2672                 return replmd_replicated_request_error(ar, ret);
2673         }
2674
2675         for (i=0; i<ni; i++) {
2676                 nmd.ctr.ctr1.array[i].local_usn = ar->seq_num;
2677         }
2678
2679         /* create the meta data value */
2680         ndr_err = ndr_push_struct_blob(&nmd_value, msg,
2681                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
2682                                        &nmd,
2683                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2684         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2685                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2686                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2687         }
2688
2689         /*
2690          * when we know that we'll modify the record, add the whenChanged, uSNChanged
2691          * and replPopertyMetaData attributes
2692          */
2693         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2694         if (ret != LDB_SUCCESS) {
2695                 return replmd_replicated_request_error(ar, ret);
2696         }
2697         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2698         if (ret != LDB_SUCCESS) {
2699                 return replmd_replicated_request_error(ar, ret);
2700         }
2701         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
2702         if (ret != LDB_SUCCESS) {
2703                 return replmd_replicated_request_error(ar, ret);
2704         }
2705
2706         replmd_ldb_message_sort(msg, ar->schema);
2707
2708         /* we want to replace the old values */
2709         for (i=0; i < msg->num_elements; i++) {
2710                 msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
2711         }
2712
2713         if (DEBUGLVL(4)) {
2714                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
2715                 DEBUG(4, ("DRS replication modify message:\n%s\n", s));
2716                 talloc_free(s);
2717         }
2718
2719         ret = ldb_build_mod_req(&change_req,
2720                                 ldb,
2721                                 ar,
2722                                 msg,
2723                                 ar->controls,
2724                                 ar,
2725                                 replmd_op_callback,
2726                                 ar->req);
2727         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2728
2729         return ldb_next_request(ar->module, change_req);
2730 }
2731
2732 static int replmd_replicated_apply_search_callback(struct ldb_request *req,
2733                                                    struct ldb_reply *ares)
2734 {
2735         struct replmd_replicated_request *ar = talloc_get_type(req->context,
2736                                                struct replmd_replicated_request);
2737         int ret;
2738
2739         if (!ares) {
2740                 return ldb_module_done(ar->req, NULL, NULL,
2741                                         LDB_ERR_OPERATIONS_ERROR);
2742         }
2743         if (ares->error != LDB_SUCCESS &&
2744             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
2745                 return ldb_module_done(ar->req, ares->controls,
2746                                         ares->response, ares->error);
2747         }
2748
2749         switch (ares->type) {
2750         case LDB_REPLY_ENTRY:
2751                 ar->search_msg = talloc_steal(ar, ares->message);
2752                 break;
2753
2754         case LDB_REPLY_REFERRAL:
2755                 /* we ignore referrals */
2756                 break;
2757
2758         case LDB_REPLY_DONE:
2759                 if (ar->search_msg != NULL) {
2760                         ret = replmd_replicated_apply_merge(ar);
2761                 } else {
2762                         ret = replmd_replicated_apply_add(ar);
2763                 }
2764                 if (ret != LDB_SUCCESS) {
2765                         return ldb_module_done(ar->req, NULL, NULL, ret);
2766                 }
2767         }
2768
2769         talloc_free(ares);
2770         return LDB_SUCCESS;
2771 }
2772
2773 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar);
2774
2775 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar)
2776 {
2777         struct ldb_context *ldb;
2778         int ret;
2779         char *tmp_str;
2780         char *filter;
2781         struct ldb_request *search_req;
2782         struct ldb_search_options_control *options;
2783
2784         if (ar->index_current >= ar->objs->num_objects) {
2785                 /* done with it, go to next stage */
2786                 return replmd_replicated_uptodate_vector(ar);
2787         }
2788
2789         ldb = ldb_module_get_ctx(ar->module);
2790         ar->search_msg = NULL;
2791
2792         tmp_str = ldb_binary_encode(ar, ar->objs->objects[ar->index_current].guid_value);
2793         if (!tmp_str) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2794
2795         filter = talloc_asprintf(ar, "(objectGUID=%s)", tmp_str);
2796         if (!filter) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2797         talloc_free(tmp_str);
2798
2799         ret = ldb_build_search_req(&search_req,
2800                                    ldb,
2801                                    ar,
2802                                    NULL,
2803                                    LDB_SCOPE_SUBTREE,
2804                                    filter,
2805                                    NULL,
2806                                    NULL,
2807                                    ar,
2808                                    replmd_replicated_apply_search_callback,
2809                                    ar->req);
2810
2811         ret = ldb_request_add_control(search_req, LDB_CONTROL_SHOW_DELETED_OID, true, NULL);
2812         if (ret != LDB_SUCCESS) {
2813                 return ret;
2814         }
2815
2816         /* we need to cope with cross-partition links, so search for
2817            the GUID over all partitions */
2818         options = talloc(search_req, struct ldb_search_options_control);
2819         if (options == NULL) {
2820                 DEBUG(0, (__location__ ": out of memory\n"));
2821                 return LDB_ERR_OPERATIONS_ERROR;
2822         }
2823         options->search_options = LDB_SEARCH_OPTION_PHANTOM_ROOT;
2824
2825         ret = ldb_request_add_control(search_req,
2826                                       LDB_CONTROL_SEARCH_OPTIONS_OID,
2827                                       true, options);
2828         if (ret != LDB_SUCCESS) {
2829                 return ret;
2830         }
2831
2832         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2833
2834         return ldb_next_request(ar->module, search_req);
2835 }
2836
2837 static int replmd_replicated_uptodate_modify_callback(struct ldb_request *req,
2838                                                       struct ldb_reply *ares)
2839 {
2840         struct ldb_context *ldb;
2841         struct replmd_replicated_request *ar = talloc_get_type(req->context,
2842                                                struct replmd_replicated_request);
2843         ldb = ldb_module_get_ctx(ar->module);
2844
2845         if (!ares) {
2846                 return ldb_module_done(ar->req, NULL, NULL,
2847                                         LDB_ERR_OPERATIONS_ERROR);
2848         }
2849         if (ares->error != LDB_SUCCESS) {
2850                 return ldb_module_done(ar->req, ares->controls,
2851                                         ares->response, ares->error);
2852         }
2853
2854         if (ares->type != LDB_REPLY_DONE) {
2855                 ldb_set_errstring(ldb, "Invalid reply type\n!");
2856                 return ldb_module_done(ar->req, NULL, NULL,
2857                                         LDB_ERR_OPERATIONS_ERROR);
2858         }
2859
2860         talloc_free(ares);
2861
2862         return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
2863 }
2864
2865 static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *ar)
2866 {
2867         struct ldb_context *ldb;
2868         struct ldb_request *change_req;
2869         enum ndr_err_code ndr_err;
2870         struct ldb_message *msg;
2871         struct replUpToDateVectorBlob ouv;
2872         const struct ldb_val *ouv_value;
2873         const struct drsuapi_DsReplicaCursor2CtrEx *ruv;
2874         struct replUpToDateVectorBlob nuv;
2875         struct ldb_val nuv_value;
2876         struct ldb_message_element *nuv_el = NULL;
2877         const struct GUID *our_invocation_id;
2878         struct ldb_message_element *orf_el = NULL;
2879         struct repsFromToBlob nrf;
2880         struct ldb_val *nrf_value = NULL;
2881         struct ldb_message_element *nrf_el = NULL;
2882         uint32_t i,j,ni=0;
2883         bool found = false;
2884         time_t t = time(NULL);
2885         NTTIME now;
2886         int ret;
2887
2888         ldb = ldb_module_get_ctx(ar->module);
2889         ruv = ar->objs->uptodateness_vector;
2890         ZERO_STRUCT(ouv);
2891         ouv.version = 2;
2892         ZERO_STRUCT(nuv);
2893         nuv.version = 2;
2894
2895         unix_to_nt_time(&now, t);
2896
2897         /*
2898          * first create the new replUpToDateVector
2899          */
2900         ouv_value = ldb_msg_find_ldb_val(ar->search_msg, "replUpToDateVector");
2901         if (ouv_value) {
2902                 ndr_err = ndr_pull_struct_blob(ouv_value, ar,
2903                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &ouv,
2904                                                (ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob);
2905                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2906                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2907                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2908                 }
2909
2910                 if (ouv.version != 2) {
2911                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
2912                 }
2913         }
2914
2915         /*
2916          * the new uptodateness vector will at least
2917          * contain 1 entry, one for the source_dsa
2918          *
2919          * plus optional values from our old vector and the one from the source_dsa
2920          */
2921         nuv.ctr.ctr2.count = 1 + ouv.ctr.ctr2.count;
2922         if (ruv) nuv.ctr.ctr2.count += ruv->count;
2923         nuv.ctr.ctr2.cursors = talloc_array(ar,
2924                                             struct drsuapi_DsReplicaCursor2,
2925                                             nuv.ctr.ctr2.count);
2926         if (!nuv.ctr.ctr2.cursors) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2927
2928         /* first copy the old vector */
2929         for (i=0; i < ouv.ctr.ctr2.count; i++) {
2930                 nuv.ctr.ctr2.cursors[ni] = ouv.ctr.ctr2.cursors[i];
2931                 ni++;
2932         }
2933
2934         /* get our invocation_id if we have one already attached to the ldb */
2935         our_invocation_id = samdb_ntds_invocation_id(ldb);
2936
2937         /* merge in the source_dsa vector is available */
2938         for (i=0; (ruv && i < ruv->count); i++) {
2939                 found = false;
2940
2941                 if (our_invocation_id &&
2942                     GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
2943                                our_invocation_id)) {
2944                         continue;
2945                 }
2946
2947                 for (j=0; j < ni; j++) {
2948                         if (!GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
2949                                         &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
2950                                 continue;
2951                         }
2952
2953                         found = true;
2954
2955                         /*
2956                          * we update only the highest_usn and not the latest_sync_success time,
2957                          * because the last success stands for direct replication
2958                          */
2959                         if (ruv->cursors[i].highest_usn > nuv.ctr.ctr2.cursors[j].highest_usn) {
2960                                 nuv.ctr.ctr2.cursors[j].highest_usn = ruv->cursors[i].highest_usn;
2961                         }
2962                         break;
2963                 }
2964
2965                 if (found) continue;
2966
2967                 /* if it's not there yet, add it */
2968                 nuv.ctr.ctr2.cursors[ni] = ruv->cursors[i];
2969                 ni++;
2970         }
2971
2972         /*
2973          * merge in the current highwatermark for the source_dsa
2974          */
2975         found = false;
2976         for (j=0; j < ni; j++) {
2977                 if (!GUID_equal(&ar->objs->source_dsa->source_dsa_invocation_id,
2978                                 &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
2979                         continue;
2980                 }
2981
2982                 found = true;
2983
2984                 /*
2985                  * here we update the highest_usn and last_sync_success time
2986                  * because we're directly replicating from the source_dsa
2987                  *
2988                  * and use the tmp_highest_usn because this is what we have just applied
2989                  * to our ldb
2990                  */
2991                 nuv.ctr.ctr2.cursors[j].highest_usn             = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
2992                 nuv.ctr.ctr2.cursors[j].last_sync_success       = now;
2993                 break;
2994         }
2995         if (!found) {
2996                 /*
2997                  * here we update the highest_usn and last_sync_success time
2998                  * because we're directly replicating from the source_dsa
2999                  *
3000                  * and use the tmp_highest_usn because this is what we have just applied
3001                  * to our ldb
3002                  */
3003                 nuv.ctr.ctr2.cursors[ni].source_dsa_invocation_id= ar->objs->source_dsa->source_dsa_invocation_id;
3004                 nuv.ctr.ctr2.cursors[ni].highest_usn            = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
3005                 nuv.ctr.ctr2.cursors[ni].last_sync_success      = now;
3006                 ni++;
3007         }
3008
3009         /*
3010          * finally correct the size of the cursors array
3011          */
3012         nuv.ctr.ctr2.count = ni;
3013
3014         /*
3015          * sort the cursors
3016          */
3017         qsort(nuv.ctr.ctr2.cursors, nuv.ctr.ctr2.count,
3018               sizeof(struct drsuapi_DsReplicaCursor2),
3019               (comparison_fn_t)drsuapi_DsReplicaCursor2_compare);
3020
3021         /*
3022          * create the change ldb_message
3023          */
3024         msg = ldb_msg_new(ar);
3025         if (!msg) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3026         msg->dn = ar->search_msg->dn;
3027
3028         ndr_err = ndr_push_struct_blob(&nuv_value, msg,
3029                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
3030                                        &nuv,
3031                                        (ndr_push_flags_fn_t)ndr_push_replUpToDateVectorBlob);
3032         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3033                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3034                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3035         }
3036         ret = ldb_msg_add_value(msg, "replUpToDateVector", &nuv_value, &nuv_el);
3037         if (ret != LDB_SUCCESS) {
3038                 return replmd_replicated_request_error(ar, ret);
3039         }
3040         nuv_el->flags = LDB_FLAG_MOD_REPLACE;
3041
3042         /*
3043          * now create the new repsFrom value from the given repsFromTo1 structure
3044          */
3045         ZERO_STRUCT(nrf);
3046         nrf.version                                     = 1;
3047         nrf.ctr.ctr1                                    = *ar->objs->source_dsa;
3048         /* and fix some values... */
3049         nrf.ctr.ctr1.consecutive_sync_failures          = 0;
3050         nrf.ctr.ctr1.last_success                       = now;
3051         nrf.ctr.ctr1.last_attempt                       = now;
3052         nrf.ctr.ctr1.result_last_attempt                = WERR_OK;
3053         nrf.ctr.ctr1.highwatermark.highest_usn          = nrf.ctr.ctr1.highwatermark.tmp_highest_usn;
3054
3055         /*
3056          * first see if we already have a repsFrom value for the current source dsa
3057          * if so we'll later replace this value
3058          */
3059         orf_el = ldb_msg_find_element(ar->search_msg, "repsFrom");
3060         if (orf_el) {
3061                 for (i=0; i < orf_el->num_values; i++) {
3062                         struct repsFromToBlob *trf;
3063
3064                         trf = talloc(ar, struct repsFromToBlob);
3065                         if (!trf) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3066
3067                         ndr_err = ndr_pull_struct_blob(&orf_el->values[i], trf, lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), trf,
3068                                                        (ndr_pull_flags_fn_t)ndr_pull_repsFromToBlob);
3069                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3070                                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3071                                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3072                         }
3073
3074                         if (trf->version != 1) {
3075                                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3076                         }
3077
3078                         /*
3079                          * we compare the source dsa objectGUID not the invocation_id
3080                          * because we want only one repsFrom value per source dsa
3081                          * and when the invocation_id of the source dsa has changed we don't need
3082                          * the old repsFrom with the old invocation_id
3083                          */
3084                         if (!GUID_equal(&trf->ctr.ctr1.source_dsa_obj_guid,
3085                                         &ar->objs->source_dsa->source_dsa_obj_guid)) {
3086                                 talloc_free(trf);
3087                                 continue;
3088                         }
3089
3090                         talloc_free(trf);
3091                         nrf_value = &orf_el->values[i];
3092                         break;
3093                 }
3094
3095                 /*
3096                  * copy over all old values to the new ldb_message
3097                  */
3098                 ret = ldb_msg_add_empty(msg, "repsFrom", 0, &nrf_el);
3099                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3100                 *nrf_el = *orf_el;
3101         }
3102
3103         /*
3104          * if we haven't found an old repsFrom value for the current source dsa
3105          * we'll add a new value
3106          */
3107         if (!nrf_value) {
3108                 struct ldb_val zero_value;
3109                 ZERO_STRUCT(zero_value);
3110                 ret = ldb_msg_add_value(msg, "repsFrom", &zero_value, &nrf_el);
3111                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3112
3113                 nrf_value = &nrf_el->values[nrf_el->num_values - 1];
3114         }
3115
3116         /* we now fill the value which is already attached to ldb_message */
3117         ndr_err = ndr_push_struct_blob(nrf_value, msg,
3118                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
3119                                        &nrf,
3120                                        (ndr_push_flags_fn_t)ndr_push_repsFromToBlob);
3121         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3122                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3123                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3124         }
3125
3126         /*
3127          * the ldb_message_element for the attribute, has all the old values and the new one
3128          * so we'll replace the whole attribute with all values
3129          */
3130         nrf_el->flags = LDB_FLAG_MOD_REPLACE;
3131
3132         if (DEBUGLVL(4)) {
3133                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
3134                 DEBUG(4, ("DRS replication uptodate modify message:\n%s\n", s));
3135                 talloc_free(s);
3136         }
3137
3138         /* prepare the ldb_modify() request */
3139         ret = ldb_build_mod_req(&change_req,
3140                                 ldb,
3141                                 ar,
3142                                 msg,
3143                                 ar->controls,
3144                                 ar,
3145                                 replmd_replicated_uptodate_modify_callback,
3146                                 ar->req);
3147         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3148
3149         return ldb_next_request(ar->module, change_req);
3150 }
3151
3152 static int replmd_replicated_uptodate_search_callback(struct ldb_request *req,
3153                                                       struct ldb_reply *ares)
3154 {
3155         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3156                                                struct replmd_replicated_request);
3157         int ret;
3158
3159         if (!ares) {
3160                 return ldb_module_done(ar->req, NULL, NULL,
3161                                         LDB_ERR_OPERATIONS_ERROR);
3162         }
3163         if (ares->error != LDB_SUCCESS &&
3164             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3165                 return ldb_module_done(ar->req, ares->controls,
3166                                         ares->response, ares->error);
3167         }
3168
3169         switch (ares->type) {
3170         case LDB_REPLY_ENTRY:
3171                 ar->search_msg = talloc_steal(ar, ares->message);
3172                 break;
3173
3174         case LDB_REPLY_REFERRAL:
3175                 /* we ignore referrals */
3176                 break;
3177
3178         case LDB_REPLY_DONE:
3179                 if (ar->search_msg == NULL) {
3180                         ret = replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3181                 } else {
3182                         ret = replmd_replicated_uptodate_modify(ar);
3183                 }
3184                 if (ret != LDB_SUCCESS) {
3185                         return ldb_module_done(ar->req, NULL, NULL, ret);
3186                 }
3187         }
3188
3189         talloc_free(ares);
3190         return LDB_SUCCESS;
3191 }
3192
3193
3194 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar)
3195 {
3196         struct ldb_context *ldb;
3197         int ret;
3198         static const char *attrs[] = {
3199                 "replUpToDateVector",
3200                 "repsFrom",
3201                 NULL
3202         };
3203         struct ldb_request *search_req;
3204
3205         ldb = ldb_module_get_ctx(ar->module);
3206         ar->search_msg = NULL;
3207
3208         ret = ldb_build_search_req(&search_req,
3209                                    ldb,
3210                                    ar,
3211                                    ar->objs->partition_dn,
3212                                    LDB_SCOPE_BASE,
3213                                    "(objectClass=*)",
3214                                    attrs,
3215                                    NULL,
3216                                    ar,
3217                                    replmd_replicated_uptodate_search_callback,
3218                                    ar->req);
3219         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3220
3221         return ldb_next_request(ar->module, search_req);
3222 }
3223
3224
3225
3226 static int replmd_extended_replicated_objects(struct ldb_module *module, struct ldb_request *req)
3227 {
3228         struct ldb_context *ldb;
3229         struct dsdb_extended_replicated_objects *objs;
3230         struct replmd_replicated_request *ar;
3231         struct ldb_control **ctrls;
3232         int ret, i;
3233         struct replmd_private *replmd_private =
3234                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3235
3236         ldb = ldb_module_get_ctx(module);
3237
3238         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_extended_replicated_objects\n");
3239
3240         objs = talloc_get_type(req->op.extended.data, struct dsdb_extended_replicated_objects);
3241         if (!objs) {
3242                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: invalid extended data\n");
3243                 return LDB_ERR_PROTOCOL_ERROR;
3244         }
3245
3246         if (objs->version != DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION) {
3247                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: extended data invalid version [%u != %u]\n",
3248                           objs->version, DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION);
3249                 return LDB_ERR_PROTOCOL_ERROR;
3250         }
3251
3252         ar = replmd_ctx_init(module, req);
3253         if (!ar)
3254                 return LDB_ERR_OPERATIONS_ERROR;
3255
3256         /* Set the flags to have the replmd_op_callback run over the full set of objects */
3257         ar->apply_mode = true;
3258         ar->objs = objs;
3259         ar->schema = dsdb_get_schema(ldb);
3260         if (!ar->schema) {
3261                 ldb_debug_set(ldb, LDB_DEBUG_FATAL, "replmd_ctx_init: no loaded schema found\n");
3262                 talloc_free(ar);
3263                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
3264                 return LDB_ERR_CONSTRAINT_VIOLATION;
3265         }
3266
3267         ctrls = req->controls;
3268
3269         if (req->controls) {
3270                 req->controls = talloc_memdup(ar, req->controls,
3271                                               talloc_get_size(req->controls));
3272                 if (!req->controls) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3273         }
3274
3275         ret = ldb_request_add_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID, false, NULL);
3276         if (ret != LDB_SUCCESS) {
3277                 return ret;
3278         }
3279
3280         ar->controls = req->controls;
3281         req->controls = ctrls;
3282
3283         DEBUG(4,("linked_attributes_count=%u\n", objs->linked_attributes_count));
3284
3285         /* save away the linked attributes for the end of the
3286            transaction */
3287         for (i=0; i<ar->objs->linked_attributes_count; i++) {
3288                 struct la_entry *la_entry;
3289
3290                 if (replmd_private->la_ctx == NULL) {
3291                         replmd_private->la_ctx = talloc_new(replmd_private);
3292                 }
3293                 la_entry = talloc(replmd_private->la_ctx, struct la_entry);
3294                 if (la_entry == NULL) {
3295                         ldb_oom(ldb);
3296                         return LDB_ERR_OPERATIONS_ERROR;
3297                 }
3298                 la_entry->la = talloc(la_entry, struct drsuapi_DsReplicaLinkedAttribute);
3299                 if (la_entry->la == NULL) {
3300                         talloc_free(la_entry);
3301                         ldb_oom(ldb);
3302                         return LDB_ERR_OPERATIONS_ERROR;
3303                 }
3304                 *la_entry->la = ar->objs->linked_attributes[i];
3305
3306                 /* we need to steal the non-scalars so they stay
3307                    around until the end of the transaction */
3308                 talloc_steal(la_entry->la, la_entry->la->identifier);
3309                 talloc_steal(la_entry->la, la_entry->la->value.blob);
3310
3311                 DLIST_ADD(replmd_private->la_list, la_entry);
3312         }
3313
3314         return replmd_replicated_apply_next(ar);
3315 }
3316
3317 /*
3318   process one linked attribute structure
3319  */
3320 static int replmd_process_linked_attribute(struct ldb_module *module,
3321                                            struct la_entry *la_entry)
3322 {
3323         struct drsuapi_DsReplicaLinkedAttribute *la = la_entry->la;
3324         struct ldb_context *ldb = ldb_module_get_ctx(module);
3325         struct dsdb_schema *schema = dsdb_get_schema(ldb);
3326         struct ldb_message *msg;
3327         TALLOC_CTX *tmp_ctx = talloc_new(la_entry);
3328         int ret;
3329         const struct dsdb_attribute *attr;
3330         struct dsdb_dn *dsdb_dn;
3331         uint64_t seq_num = 0;
3332         struct drsuapi_DsReplicaAttribute drs;
3333         struct drsuapi_DsAttributeValue val;
3334         struct ldb_message_element new_el, *old_el;
3335         WERROR status;
3336         time_t t = time(NULL);
3337         struct ldb_result *res;
3338         const char *attrs[2];
3339         struct parsed_dn *pdn_list, *pdn;
3340         struct GUID guid = GUID_zero();
3341         NTSTATUS ntstatus;
3342         bool active = (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?true:false;
3343         const struct GUID *our_invocation_id;
3344
3345         drs.value_ctr.num_values = 1;
3346         drs.value_ctr.values = &val;
3347         val.blob = la->value.blob;
3348
3349 /*
3350 linked_attributes[0]:
3351      &objs->linked_attributes[i]: struct drsuapi_DsReplicaLinkedAttribute
3352         identifier               : *
3353             identifier: struct drsuapi_DsReplicaObjectIdentifier
3354                 __ndr_size               : 0x0000003a (58)
3355                 __ndr_size_sid           : 0x00000000 (0)
3356                 guid                     : 8e95b6a9-13dd-4158-89db-3220a5be5cc7
3357                 sid                      : S-0-0
3358                 __ndr_size_dn            : 0x00000000 (0)
3359                 dn                       : ''
3360         attid                    : DRSUAPI_ATTRIBUTE_member (0x1F)
3361         value: struct drsuapi_DsAttributeValue
3362             __ndr_size               : 0x0000007e (126)
3363             blob                     : *
3364                 blob                     : DATA_BLOB length=126
3365         flags                    : 0x00000001 (1)
3366                1: DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE
3367         originating_add_time     : Wed Sep  2 22:20:01 2009 EST
3368         meta_data: struct drsuapi_DsReplicaMetaData
3369             version                  : 0x00000015 (21)
3370             originating_change_time  : Wed Sep  2 23:39:07 2009 EST
3371             originating_invocation_id: 794640f3-18cf-40ee-a211-a93992b67a64
3372             originating_usn          : 0x000000000001e19c (123292)
3373
3374 (for cases where the link is to a normal DN)
3375      &target: struct drsuapi_DsReplicaObjectIdentifier3
3376         __ndr_size               : 0x0000007e (126)
3377         __ndr_size_sid           : 0x0000001c (28)
3378         guid                     : 7639e594-db75-4086-b0d4-67890ae46031
3379         sid                      : S-1-5-21-2848215498-2472035911-1947525656-19924
3380         __ndr_size_dn            : 0x00000022 (34)
3381         dn                       : 'CN=UOne,OU=TestOU,DC=vsofs8,DC=com'
3382  */
3383
3384         /* find the attribute being modified */
3385         attr = dsdb_attribute_by_attributeID_id(schema, la->attid);
3386         if (attr == NULL) {
3387                 DEBUG(0, (__location__ ": Unable to find attributeID 0x%x\n", la->attid));
3388                 talloc_free(tmp_ctx);
3389                 return LDB_ERR_OPERATIONS_ERROR;
3390         }
3391
3392         attrs[0] = attr->lDAPDisplayName;
3393         attrs[1] = NULL;
3394
3395         /* get the existing message from the db for the object with
3396            this GUID, returning attribute being modified. We will then
3397            use this msg as the basis for a modify call */
3398         ret = dsdb_module_search(module, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE, attrs,
3399                                  DSDB_SEARCH_SEARCH_ALL_PARTITIONS |
3400                                  DSDB_SEARCH_SHOW_DELETED |
3401                                  DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
3402                                  DSDB_SEARCH_REVEAL_INTERNALS,
3403                                  "objectGUID=%s", GUID_string(tmp_ctx, &la->identifier->guid));
3404         if (ret != LDB_SUCCESS) {
3405                 talloc_free(tmp_ctx);
3406                 return ret;
3407         }
3408         if (res->count != 1) {
3409                 ldb_asprintf_errstring(ldb, "DRS linked attribute for GUID %s - DN not found",
3410                                        GUID_string(tmp_ctx, &la->identifier->guid));
3411                 talloc_free(tmp_ctx);
3412                 return LDB_ERR_NO_SUCH_OBJECT;
3413         }
3414         msg = res->msgs[0];
3415
3416         if (msg->num_elements == 0) {
3417                 ret = ldb_msg_add_empty(msg, attr->lDAPDisplayName, LDB_FLAG_MOD_REPLACE, &old_el);
3418                 if (ret != LDB_SUCCESS) {
3419                         ldb_module_oom(module);
3420                         talloc_free(tmp_ctx);
3421                         return LDB_ERR_OPERATIONS_ERROR;
3422                 }
3423         } else {
3424                 old_el = &msg->elements[0];
3425                 old_el->flags = LDB_FLAG_MOD_REPLACE;
3426         }
3427
3428         /* parse the existing links */
3429         ret = get_parsed_dns(module, tmp_ctx, old_el, &pdn_list, attr->syntax->ldap_oid);
3430         if (ret != LDB_SUCCESS) {
3431                 talloc_free(tmp_ctx);
3432                 return ret;
3433         }
3434
3435         /* get our invocationId */
3436         our_invocation_id = samdb_ntds_invocation_id(ldb);
3437         if (!our_invocation_id) {
3438                 ldb_debug_set(ldb, LDB_DEBUG_ERROR, __location__ ": unable to find invocationId\n");
3439                 talloc_free(tmp_ctx);
3440                 return LDB_ERR_OPERATIONS_ERROR;
3441         }
3442
3443         ret = replmd_check_upgrade_links(pdn_list, old_el->num_values, our_invocation_id);
3444         if (ret != LDB_SUCCESS) {
3445                 talloc_free(tmp_ctx);
3446                 return ret;
3447         }
3448
3449         status = attr->syntax->drsuapi_to_ldb(ldb, schema, attr, &drs, tmp_ctx, &new_el);
3450         if (!W_ERROR_IS_OK(status)) {
3451                 ldb_asprintf_errstring(ldb, "Failed to parsed linked attribute blob for %s on %s\n",
3452                                        old_el->name, ldb_dn_get_linearized(msg->dn));
3453                 return LDB_ERR_OPERATIONS_ERROR;
3454         }
3455
3456         if (new_el.num_values != 1) {
3457                 ldb_asprintf_errstring(ldb, "Failed to find value in linked attribute blob for %s on %s\n",
3458                                        old_el->name, ldb_dn_get_linearized(msg->dn));
3459                 return LDB_ERR_OPERATIONS_ERROR;
3460         }
3461
3462         dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &new_el.values[0], attr->syntax->ldap_oid);
3463         if (!dsdb_dn) {
3464                 ldb_asprintf_errstring(ldb, "Failed to parse DN in linked attribute blob for %s on %s\n",
3465                                        old_el->name, ldb_dn_get_linearized(msg->dn));
3466                 return LDB_ERR_OPERATIONS_ERROR;
3467         }
3468
3469         ntstatus = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid, "GUID");
3470         if (!NT_STATUS_IS_OK(ntstatus) && active) {
3471                 ldb_asprintf_errstring(ldb, "Failed to find GUID in linked attribute blob for %s on %s from %s",
3472                                        old_el->name,
3473                                        ldb_dn_get_linearized(dsdb_dn->dn),
3474                                        ldb_dn_get_linearized(msg->dn));
3475                 return LDB_ERR_OPERATIONS_ERROR;
3476         }
3477
3478         /* see if this link already exists */
3479         pdn = parsed_dn_find(pdn_list, old_el->num_values, &guid, dsdb_dn->dn);
3480         if (pdn != NULL) {
3481                 /* see if this update is newer than what we have already */
3482                 struct GUID invocation_id = GUID_zero();
3483                 uint32_t version = 0;
3484                 NTTIME change_time = 0;
3485                 bool was_active = ldb_dn_get_extended_component(pdn->dsdb_dn->dn, "DELETED") == NULL;
3486
3487                 dsdb_get_extended_dn_guid(pdn->dsdb_dn->dn, &invocation_id, "RMD_INVOCID");
3488                 dsdb_get_extended_dn_uint32(pdn->dsdb_dn->dn, &version, "RMD_VERSION");
3489                 dsdb_get_extended_dn_nttime(pdn->dsdb_dn->dn, &change_time, "RMD_CHANGETIME");
3490
3491                 if (!replmd_update_is_newer(&invocation_id,
3492                                             &la->meta_data.originating_invocation_id,
3493                                             version,
3494                                             la->meta_data.version,
3495                                             change_time,
3496                                             la->meta_data.originating_change_time)) {
3497                         DEBUG(1,("Discarding older DRS linked attribute update to %s on %s from %s\n",
3498                                  old_el->name, ldb_dn_get_linearized(msg->dn),
3499                                  GUID_string(tmp_ctx, &la->meta_data.originating_invocation_id)));
3500                         talloc_free(tmp_ctx);
3501                         return LDB_SUCCESS;
3502                 }
3503
3504                 /* get a seq_num for this change */
3505                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
3506                 if (ret != LDB_SUCCESS) {
3507                         talloc_free(tmp_ctx);
3508                         return ret;
3509                 }
3510
3511                 if (was_active) {
3512                         /* remove the existing backlink */
3513                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, false, attr, false);
3514                         if (ret != LDB_SUCCESS) {
3515                                 talloc_free(tmp_ctx);
3516                                 return ret;
3517                         }
3518                 }
3519
3520                 ret = replmd_update_la_val(tmp_ctx, pdn->v, dsdb_dn, pdn->dsdb_dn,
3521                                            &la->meta_data.originating_invocation_id,
3522                                            la->meta_data.originating_usn, seq_num,
3523                                            la->meta_data.originating_change_time,
3524                                            la->meta_data.version,
3525                                            !active);
3526                 if (ret != LDB_SUCCESS) {
3527                         talloc_free(tmp_ctx);
3528                         return ret;
3529                 }
3530
3531                 if (active) {
3532                         /* add the new backlink */
3533                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, true, attr, false);
3534                         if (ret != LDB_SUCCESS) {
3535                                 talloc_free(tmp_ctx);
3536                                 return ret;
3537                         }
3538                 }
3539         } else {
3540                 /* get a seq_num for this change */
3541                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
3542                 if (ret != LDB_SUCCESS) {
3543                         talloc_free(tmp_ctx);
3544                         return ret;
3545                 }
3546
3547                 old_el->values = talloc_realloc(msg->elements, old_el->values,
3548                                                 struct ldb_val, old_el->num_values+1);
3549                 if (!old_el->values) {
3550                         ldb_module_oom(module);
3551                         return LDB_ERR_OPERATIONS_ERROR;
3552                 }
3553                 old_el->num_values++;
3554
3555                 ret = replmd_build_la_val(tmp_ctx, &old_el->values[old_el->num_values-1], dsdb_dn,
3556                                           &la->meta_data.originating_invocation_id,
3557                                           la->meta_data.originating_usn, seq_num,
3558                                           la->meta_data.originating_change_time,
3559                                           la->meta_data.version,
3560                                           (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?false:true);
3561                 if (ret != LDB_SUCCESS) {
3562                         talloc_free(tmp_ctx);
3563                         return ret;
3564                 }
3565
3566                 if (active) {
3567                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid,
3568                                                   true, attr, false);
3569                         if (ret != LDB_SUCCESS) {
3570                                 talloc_free(tmp_ctx);
3571                                 return ret;
3572                         }
3573                 }
3574         }
3575
3576         /* we only change whenChanged and uSNChanged if the seq_num
3577            has changed */
3578         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
3579                 talloc_free(tmp_ctx);
3580                 return LDB_ERR_OPERATIONS_ERROR;
3581         }
3582
3583         if (add_uint64_element(msg, "uSNChanged", seq_num) != LDB_SUCCESS) {
3584                 talloc_free(tmp_ctx);
3585                 return LDB_ERR_OPERATIONS_ERROR;
3586         }
3587
3588         ret = dsdb_check_single_valued_link(attr, old_el);
3589         if (ret != LDB_SUCCESS) {
3590                 talloc_free(tmp_ctx);
3591                 return ret;
3592         }
3593
3594         ret = dsdb_module_modify(module, msg, DSDB_MODIFY_RELAX);
3595         if (ret != LDB_SUCCESS) {
3596                 ldb_debug(ldb, LDB_DEBUG_WARNING, "Failed to apply linked attribute change '%s'\n%s\n",
3597                           ldb_errstring(ldb),
3598                           ldb_ldif_message_string(ldb, tmp_ctx, LDB_CHANGETYPE_MODIFY, msg));
3599                 talloc_free(tmp_ctx);
3600                 return ret;
3601         }
3602
3603         talloc_free(tmp_ctx);
3604
3605         return ret;
3606 }
3607
3608 static int replmd_extended(struct ldb_module *module, struct ldb_request *req)
3609 {
3610         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_REPLICATED_OBJECTS_OID) == 0) {
3611                 return replmd_extended_replicated_objects(module, req);
3612         }
3613
3614         return ldb_next_request(module, req);
3615 }
3616
3617
3618 /*
3619   we hook into the transaction operations to allow us to
3620   perform the linked attribute updates at the end of the whole
3621   transaction. This allows a forward linked attribute to be created
3622   before the object is created. During a vampire, w2k8 sends us linked
3623   attributes before the objects they are part of.
3624  */
3625 static int replmd_start_transaction(struct ldb_module *module)
3626 {
3627         /* create our private structure for this transaction */
3628         struct replmd_private *replmd_private = talloc_get_type(ldb_module_get_private(module),
3629                                                                 struct replmd_private);
3630         replmd_txn_cleanup(replmd_private);
3631
3632         /* free any leftover mod_usn records from cancelled
3633            transactions */
3634         while (replmd_private->ncs) {
3635                 struct nc_entry *e = replmd_private->ncs;
3636                 DLIST_REMOVE(replmd_private->ncs, e);
3637                 talloc_free(e);
3638         }
3639
3640         return ldb_next_start_trans(module);
3641 }
3642
3643 /*
3644   on prepare commit we loop over our queued la_context structures and
3645   apply each of them
3646  */
3647 static int replmd_prepare_commit(struct ldb_module *module)
3648 {
3649         struct replmd_private *replmd_private =
3650                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3651         struct la_entry *la, *prev;
3652         struct la_backlink *bl;
3653         int ret;
3654
3655         /* walk the list backwards, to do the first entry first, as we
3656          * added the entries with DLIST_ADD() which puts them at the
3657          * start of the list */
3658         for (la = replmd_private->la_list; la && la->next; la=la->next) ;
3659
3660         for (; la; la=prev) {
3661                 prev = la->prev;
3662                 DLIST_REMOVE(replmd_private->la_list, la);
3663                 ret = replmd_process_linked_attribute(module, la);
3664                 if (ret != LDB_SUCCESS) {
3665                         replmd_txn_cleanup(replmd_private);
3666                         return ret;
3667                 }
3668         }
3669
3670         /* process our backlink list, creating and deleting backlinks
3671            as necessary */
3672         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
3673                 ret = replmd_process_backlink(module, bl);
3674                 if (ret != LDB_SUCCESS) {
3675                         replmd_txn_cleanup(replmd_private);
3676                         return ret;
3677                 }
3678         }
3679
3680         replmd_txn_cleanup(replmd_private);
3681
3682         /* possibly change @REPLCHANGED */
3683         ret = replmd_notify_store(module);
3684         if (ret != LDB_SUCCESS) {
3685                 return ret;
3686         }
3687
3688         return ldb_next_prepare_commit(module);
3689 }
3690
3691 static int replmd_del_transaction(struct ldb_module *module)
3692 {
3693         struct replmd_private *replmd_private =
3694                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3695         replmd_txn_cleanup(replmd_private);
3696
3697         return ldb_next_del_trans(module);
3698 }
3699
3700
3701 _PUBLIC_ const struct ldb_module_ops ldb_repl_meta_data_module_ops = {
3702         .name          = "repl_meta_data",
3703         .init_context      = replmd_init,
3704         .add               = replmd_add,
3705         .modify            = replmd_modify,
3706         .rename            = replmd_rename,
3707         .del               = replmd_delete,
3708         .extended          = replmd_extended,
3709         .start_transaction = replmd_start_transaction,
3710         .prepare_commit    = replmd_prepare_commit,
3711         .del_transaction   = replmd_del_transaction,
3712 };