source4/dsdb/samdb/ldb_modules/repl_meta_data.c

   1 /*
   2    ldb database library
   3
   4    Copyright (C) Simo Sorce  2004-2008
   5    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   6    Copyright (C) Andrew Tridgell 2005
   7    Copyright (C) Stefan Metzmacher <metze@samba.org> 2007
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 /*
  24  *  Name: ldb
  25  *
  26  *  Component: ldb repl_meta_data module
  27  *
  28  *  Description: - add a unique objectGUID onto every new record,
  29  *               - handle whenCreated, whenChanged timestamps
  30  *               - handle uSNCreated, uSNChanged numbers
  31  *               - handle replPropertyMetaData attribute
  32  *
  33  *  Author: Simo Sorce
  34  *  Author: Stefan Metzmacher
  35  */
  36
  37 #include "includes.h"
  38 #include "ldb_module.h"
  39 #include "dsdb/samdb/samdb.h"
  40 #include "dsdb/common/proto.h"
  41 #include "../libds/common/flags.h"
  42 #include "librpc/gen_ndr/ndr_misc.h"
  43 #include "librpc/gen_ndr/ndr_drsuapi.h"
  44 #include "librpc/gen_ndr/ndr_drsblobs.h"
  45 #include "param/param.h"
  46 #include "libcli/security/dom_sid.h"
  47 #include "lib/util/dlinklist.h"
  48 #include "dsdb/samdb/ldb_modules/util.h"
  49 #include "lib/util/binsearch.h"
  50 #include "libcli/security/security.h"
  51
  52 #define W2K3_LINKED_ATTRIBUTES 1
  53
  54 struct replmd_private {
  55         TALLOC_CTX *la_ctx;
  56         struct la_entry *la_list;
  57         TALLOC_CTX *bl_ctx;
  58         struct la_backlink *la_backlinks;
  59         struct nc_entry {
  60                 struct nc_entry *prev, *next;
  61                 struct ldb_dn *dn;
  62                 uint64_t mod_usn;
  63         } *ncs;
  64 };
  65
  66 struct la_entry {
  67         struct la_entry *next, *prev;
  68         struct drsuapi_DsReplicaLinkedAttribute *la;
  69 };
  70
  71 struct replmd_replicated_request {
  72         struct ldb_module *module;
  73         struct ldb_request *req;
  74
  75         const struct dsdb_schema *schema;
  76
  77         /* the controls we pass down */
  78         struct ldb_control **controls;
  79
  80         /* details for the mode where we apply a bunch of inbound replication meessages */
  81         bool apply_mode;
  82         uint32_t index_current;
  83         struct dsdb_extended_replicated_objects *objs;
  84
  85         struct ldb_message *search_msg;
  86
  87         uint64_t seq_num;
  88
  89 };
  90
  91 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar);
  92
  93
  94 /*
  95   initialise the module
  96   allocate the private structure and build the list
  97   of partition DNs for use by replmd_notify()
  98  */
  99 static int replmd_init(struct ldb_module *module)
 100 {
 101         struct replmd_private *replmd_private;
 102         struct ldb_context *ldb = ldb_module_get_ctx(module);
 103
 104         replmd_private = talloc_zero(module, struct replmd_private);
 105         if (replmd_private == NULL) {
 106                 ldb_oom(ldb);
 107                 return LDB_ERR_OPERATIONS_ERROR;
 108         }
 109         ldb_module_set_private(module, replmd_private);
 110
 111         return ldb_next_init(module);
 112 }
 113
 114 /*
 115   cleanup our per-transaction contexts
 116  */
 117 static void replmd_txn_cleanup(struct replmd_private *replmd_private)
 118 {
 119         talloc_free(replmd_private->la_ctx);
 120         replmd_private->la_list = NULL;
 121         replmd_private->la_ctx = NULL;
 122
 123         talloc_free(replmd_private->bl_ctx);
 124         replmd_private->la_backlinks = NULL;
 125         replmd_private->bl_ctx = NULL;
 126 }
 127
 128
 129 struct la_backlink {
 130         struct la_backlink *next, *prev;
 131         const char *attr_name;
 132         struct GUID forward_guid, target_guid;
 133         bool active;
 134 };
 135
 136 /*
 137   process a backlinks we accumulated during a transaction, adding and
 138   deleting the backlinks from the target objects
 139  */
 140 static int replmd_process_backlink(struct ldb_module *module, struct la_backlink *bl)
 141 {
 142         struct ldb_dn *target_dn, *source_dn;
 143         int ret;
 144         struct ldb_context *ldb = ldb_module_get_ctx(module);
 145         struct ldb_message *msg;
 146         TALLOC_CTX *tmp_ctx = talloc_new(bl);
 147         char *dn_string;
 148
 149         /*
 150           - find DN of target
 151           - find DN of source
 152           - construct ldb_message
 153               - either an add or a delete
 154          */
 155         ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->target_guid, &target_dn);
 156         if (ret != LDB_SUCCESS) {
 157                 ldb_asprintf_errstring(ldb, "Failed to find target DN for linked attribute with GUID %s\n",
 158                                        GUID_string(bl, &bl->target_guid));
 159                 talloc_free(tmp_ctx);
 160                 return ret;
 161         }
 162
 163         ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->forward_guid, &source_dn);
 164         if (ret != LDB_SUCCESS) {
 165                 ldb_asprintf_errstring(ldb, "Failed to find source DN for linked attribute with GUID %s\n",
 166                                        GUID_string(bl, &bl->forward_guid));
 167                 talloc_free(tmp_ctx);
 168                 return ret;
 169         }
 170
 171         msg = ldb_msg_new(tmp_ctx);
 172         if (msg == NULL) {
 173                 ldb_module_oom(module);
 174                 talloc_free(tmp_ctx);
 175                 return LDB_ERR_OPERATIONS_ERROR;
 176         }
 177
 178         /* construct a ldb_message for adding/deleting the backlink */
 179         msg->dn = target_dn;
 180         dn_string = ldb_dn_get_extended_linearized(tmp_ctx, source_dn, 1);
 181         if (!dn_string) {
 182                 ldb_module_oom(module);
 183                 talloc_free(tmp_ctx);
 184                 return LDB_ERR_OPERATIONS_ERROR;
 185         }
 186         ret = ldb_msg_add_steal_string(msg, bl->attr_name, dn_string);
 187         if (ret != LDB_SUCCESS) {
 188                 talloc_free(tmp_ctx);
 189                 return ret;
 190         }
 191         msg->elements[0].flags = bl->active?LDB_FLAG_MOD_ADD:LDB_FLAG_MOD_DELETE;
 192
 193         ret = dsdb_module_modify(module, msg, 0);
 194         if (ret != LDB_SUCCESS) {
 195                 ldb_asprintf_errstring(ldb, "Failed to %s backlink from %s to %s - %s",
 196                                        bl->active?"add":"remove",
 197                                        ldb_dn_get_linearized(source_dn),
 198                                        ldb_dn_get_linearized(target_dn),
 199                                        ldb_errstring(ldb));
 200                 talloc_free(tmp_ctx);
 201                 return ret;
 202         }
 203         talloc_free(tmp_ctx);
 204         return ret;
 205 }
 206
 207 /*
 208   add a backlink to the list of backlinks to add/delete in the prepare
 209   commit
 210  */
 211 static int replmd_add_backlink(struct ldb_module *module, const struct dsdb_schema *schema,
 212                                struct GUID *forward_guid, struct GUID *target_guid,
 213                                bool active, const struct dsdb_attribute *schema_attr, bool immediate)
 214 {
 215         const struct dsdb_attribute *target_attr;
 216         struct la_backlink *bl;
 217         struct replmd_private *replmd_private =
 218                 talloc_get_type_abort(ldb_module_get_private(module), struct replmd_private);
 219
 220         target_attr = dsdb_attribute_by_linkID(schema, schema_attr->linkID ^ 1);
 221         if (!target_attr) {
 222                 /*
 223                  * windows 2003 has a broken schema where the
 224                  * definition of msDS-IsDomainFor is missing (which is
 225                  * supposed to be the backlink of the
 226                  * msDS-HasDomainNCs attribute
 227                  */
 228                 return LDB_SUCCESS;
 229         }
 230
 231         /* see if its already in the list */
 232         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
 233                 if (GUID_equal(forward_guid, &bl->forward_guid) &&
 234                     GUID_equal(target_guid, &bl->target_guid) &&
 235                     (target_attr->lDAPDisplayName == bl->attr_name ||
 236                      strcmp(target_attr->lDAPDisplayName, bl->attr_name) == 0)) {
 237                         break;
 238                 }
 239         }
 240
 241         if (bl) {
 242                 /* we found an existing one */
 243                 if (bl->active == active) {
 244                         return LDB_SUCCESS;
 245                 }
 246                 DLIST_REMOVE(replmd_private->la_backlinks, bl);
 247                 talloc_free(bl);
 248                 return LDB_SUCCESS;
 249         }
 250
 251         if (replmd_private->bl_ctx == NULL) {
 252                 replmd_private->bl_ctx = talloc_new(replmd_private);
 253                 if (replmd_private->bl_ctx == NULL) {
 254                         ldb_module_oom(module);
 255                         return LDB_ERR_OPERATIONS_ERROR;
 256                 }
 257         }
 258
 259         /* its a new one */
 260         bl = talloc(replmd_private->bl_ctx, struct la_backlink);
 261         if (bl == NULL) {
 262                 ldb_module_oom(module);
 263                 return LDB_ERR_OPERATIONS_ERROR;
 264         }
 265
 266         bl->attr_name = target_attr->lDAPDisplayName;
 267         bl->forward_guid = *forward_guid;
 268         bl->target_guid = *target_guid;
 269         bl->active = active;
 270
 271         /* the caller may ask for this backlink to be processed
 272            immediately */
 273         if (immediate) {
 274                 int ret = replmd_process_backlink(module, bl);
 275                 talloc_free(bl);
 276                 return ret;
 277         }
 278
 279         DLIST_ADD(replmd_private->la_backlinks, bl);
 280
 281         return LDB_SUCCESS;
 282 }
 283
 284
 285 /*
 286  * Callback for most write operations in this module:
 287  *
 288  * notify the repl task that a object has changed. The notifies are
 289  * gathered up in the replmd_private structure then written to the
 290  * @REPLCHANGED object in each partition during the prepare_commit
 291  */
 292 static int replmd_op_callback(struct ldb_request *req, struct ldb_reply *ares)
 293 {
 294         int ret;
 295         struct replmd_replicated_request *ac =
 296                 talloc_get_type_abort(req->context, struct replmd_replicated_request);
 297         struct replmd_private *replmd_private =
 298                 talloc_get_type_abort(ldb_module_get_private(ac->module), struct replmd_private);
 299         struct nc_entry *modified_partition;
 300         struct ldb_control *partition_ctrl;
 301         const struct dsdb_control_current_partition *partition;
 302
 303         struct ldb_control **controls;
 304
 305         partition_ctrl = ldb_reply_get_control(ares, DSDB_CONTROL_CURRENT_PARTITION_OID);
 306
 307         /* Remove the 'partition' control from what we pass up the chain */
 308         controls = controls_except_specified(ares->controls, ares, partition_ctrl);
 309
 310         if (ares->error != LDB_SUCCESS) {
 311                 return ldb_module_done(ac->req, controls,
 312                                         ares->response, ares->error);
 313         }
 314
 315         if (ares->type != LDB_REPLY_DONE) {
 316                 ldb_set_errstring(ldb_module_get_ctx(ac->module), "Invalid reply type for notify\n!");
 317                 return ldb_module_done(ac->req, NULL,
 318                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 319         }
 320
 321         if (!partition_ctrl) {
 322                 ldb_set_errstring(ldb_module_get_ctx(ac->module),"No partition control on reply");
 323                 return ldb_module_done(ac->req, NULL,
 324                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 325         }
 326
 327         partition = talloc_get_type_abort(partition_ctrl->data,
 328                                     struct dsdb_control_current_partition);
 329
 330         if (ac->seq_num > 0) {
 331                 for (modified_partition = replmd_private->ncs; modified_partition;
 332                      modified_partition = modified_partition->next) {
 333                         if (ldb_dn_compare(modified_partition->dn, partition->dn) == 0) {
 334                                 break;
 335                         }
 336                 }
 337
 338                 if (modified_partition == NULL) {
 339                         modified_partition = talloc_zero(replmd_private, struct nc_entry);
 340                         if (!modified_partition) {
 341                                 ldb_oom(ldb_module_get_ctx(ac->module));
 342                                 return ldb_module_done(ac->req, NULL,
 343                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 344                         }
 345                         modified_partition->dn = ldb_dn_copy(modified_partition, partition->dn);
 346                         if (!modified_partition->dn) {
 347                                 ldb_oom(ldb_module_get_ctx(ac->module));
 348                                 return ldb_module_done(ac->req, NULL,
 349                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 350                         }
 351                         DLIST_ADD(replmd_private->ncs, modified_partition);
 352                 }
 353
 354                 if (ac->seq_num > modified_partition->mod_usn) {
 355                         modified_partition->mod_usn = ac->seq_num;
 356                 }
 357         }
 358
 359         if (ac->apply_mode) {
 360                 talloc_free(ares);
 361                 ac->index_current++;
 362
 363                 ret = replmd_replicated_apply_next(ac);
 364                 if (ret != LDB_SUCCESS) {
 365                         return ldb_module_done(ac->req, NULL, NULL, ret);
 366                 }
 367                 return ret;
 368         } else {
 369                 /* free the partition control container here, for the
 370                  * common path.  Other cases will have it cleaned up
 371                  * eventually with the ares */
 372                 talloc_free(partition_ctrl);
 373                 return ldb_module_done(ac->req,
 374                                        controls_except_specified(controls, ares, partition_ctrl),
 375                                        ares->response, LDB_SUCCESS);
 376         }
 377 }
 378
 379
 380 /*
 381  * update a @REPLCHANGED record in each partition if there have been
 382  * any writes of replicated data in the partition
 383  */
 384 static int replmd_notify_store(struct ldb_module *module)
 385 {
 386         struct replmd_private *replmd_private =
 387                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
 388         struct ldb_context *ldb = ldb_module_get_ctx(module);
 389
 390         while (replmd_private->ncs) {
 391                 int ret;
 392                 struct nc_entry *modified_partition = replmd_private->ncs;
 393
 394                 ret = dsdb_save_partition_usn(ldb, modified_partition->dn, modified_partition->mod_usn);
 395                 if (ret != LDB_SUCCESS) {
 396                         DEBUG(0,(__location__ ": Failed to save partition uSN for %s\n",
 397                                  ldb_dn_get_linearized(modified_partition->dn)));
 398                         return ret;
 399                 }
 400                 DLIST_REMOVE(replmd_private->ncs, modified_partition);
 401                 talloc_free(modified_partition);
 402         }
 403
 404         return LDB_SUCCESS;
 405 }
 406
 407
 408 /*
 409   created a replmd_replicated_request context
 410  */
 411 static struct replmd_replicated_request *replmd_ctx_init(struct ldb_module *module,
 412                                                          struct ldb_request *req)
 413 {
 414         struct ldb_context *ldb;
 415         struct replmd_replicated_request *ac;
 416
 417         ldb = ldb_module_get_ctx(module);
 418
 419         ac = talloc_zero(req, struct replmd_replicated_request);
 420         if (ac == NULL) {
 421                 ldb_oom(ldb);
 422                 return NULL;
 423         }
 424
 425         ac->module = module;
 426         ac->req = req;
 427
 428         ac->schema = dsdb_get_schema(ldb);
 429         if (!ac->schema) {
 430                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
 431                               "replmd_modify: no dsdb_schema loaded");
 432                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
 433                 return NULL;
 434         }
 435
 436         return ac;
 437 }
 438
 439 /*
 440   add a time element to a record
 441 */
 442 static int add_time_element(struct ldb_message *msg, const char *attr, time_t t)
 443 {
 444         struct ldb_message_element *el;
 445         char *s;
 446
 447         if (ldb_msg_find_element(msg, attr) != NULL) {
 448                 return LDB_SUCCESS;
 449         }
 450
 451         s = ldb_timestring(msg, t);
 452         if (s == NULL) {
 453                 return LDB_ERR_OPERATIONS_ERROR;
 454         }
 455
 456         if (ldb_msg_add_string(msg, attr, s) != LDB_SUCCESS) {
 457                 return LDB_ERR_OPERATIONS_ERROR;
 458         }
 459
 460         el = ldb_msg_find_element(msg, attr);
 461         /* always set as replace. This works because on add ops, the flag
 462            is ignored */
 463         el->flags = LDB_FLAG_MOD_REPLACE;
 464
 465         return LDB_SUCCESS;
 466 }
 467
 468 /*
 469   add a uint64_t element to a record
 470 */
 471 static int add_uint64_element(struct ldb_message *msg, const char *attr, uint64_t v)
 472 {
 473         struct ldb_message_element *el;
 474
 475         if (ldb_msg_find_element(msg, attr) != NULL) {
 476                 return LDB_SUCCESS;
 477         }
 478
 479         if (ldb_msg_add_fmt(msg, attr, "%llu", (unsigned long long)v) != LDB_SUCCESS) {
 480                 return LDB_ERR_OPERATIONS_ERROR;
 481         }
 482
 483         el = ldb_msg_find_element(msg, attr);
 484         /* always set as replace. This works because on add ops, the flag
 485            is ignored */
 486         el->flags = LDB_FLAG_MOD_REPLACE;
 487
 488         return LDB_SUCCESS;
 489 }
 490
 491 static int replmd_replPropertyMetaData1_attid_sort(const struct replPropertyMetaData1 *m1,
 492                                                    const struct replPropertyMetaData1 *m2,
 493                                                    const uint32_t *rdn_attid)
 494 {
 495         if (m1->attid == m2->attid) {
 496                 return 0;
 497         }
 498
 499         /*
 500          * the rdn attribute should be at the end!
 501          * so we need to return a value greater than zero
 502          * which means m1 is greater than m2
 503          */
 504         if (m1->attid == *rdn_attid) {
 505                 return 1;
 506         }
 507
 508         /*
 509          * the rdn attribute should be at the end!
 510          * so we need to return a value less than zero
 511          * which means m2 is greater than m1
 512          */
 513         if (m2->attid == *rdn_attid) {
 514                 return -1;
 515         }
 516
 517         return m1->attid > m2->attid ? 1 : -1;
 518 }
 519
 520 static int replmd_replPropertyMetaDataCtr1_sort(struct replPropertyMetaDataCtr1 *ctr1,
 521                                                 const struct dsdb_schema *schema,
 522                                                 struct ldb_dn *dn)
 523 {
 524         const char *rdn_name;
 525         const struct dsdb_attribute *rdn_sa;
 526
 527         rdn_name = ldb_dn_get_rdn_name(dn);
 528         if (!rdn_name) {
 529                 DEBUG(0,(__location__ ": No rDN for %s?\n", ldb_dn_get_linearized(dn)));
 530                 return LDB_ERR_OPERATIONS_ERROR;
 531         }
 532
 533         rdn_sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
 534         if (rdn_sa == NULL) {
 535                 DEBUG(0,(__location__ ": No sa found for rDN %s for %s\n", rdn_name, ldb_dn_get_linearized(dn)));
 536                 return LDB_ERR_OPERATIONS_ERROR;
 537         }
 538
 539         DEBUG(6,("Sorting rpmd with attid exception %u rDN=%s DN=%s\n",
 540                  rdn_sa->attributeID_id, rdn_name, ldb_dn_get_linearized(dn)));
 541
 542         ldb_qsort(ctr1->array, ctr1->count, sizeof(struct replPropertyMetaData1),
 543                   discard_const_p(void, &rdn_sa->attributeID_id),
 544                   (ldb_qsort_cmp_fn_t)replmd_replPropertyMetaData1_attid_sort);
 545
 546         return LDB_SUCCESS;
 547 }
 548
 549 static int replmd_ldb_message_element_attid_sort(const struct ldb_message_element *e1,
 550                                                  const struct ldb_message_element *e2,
 551                                                  const struct dsdb_schema *schema)
 552 {
 553         const struct dsdb_attribute *a1;
 554         const struct dsdb_attribute *a2;
 555
 556         /*
 557          * TODO: make this faster by caching the dsdb_attribute pointer
 558          *       on the ldb_messag_element
 559          */
 560
 561         a1 = dsdb_attribute_by_lDAPDisplayName(schema, e1->name);
 562         a2 = dsdb_attribute_by_lDAPDisplayName(schema, e2->name);
 563
 564         /*
 565          * TODO: remove this check, we should rely on e1 and e2 having valid attribute names
 566          *       in the schema
 567          */
 568         if (!a1 || !a2) {
 569                 return strcasecmp(e1->name, e2->name);
 570         }
 571         if (a1->attributeID_id == a2->attributeID_id) {
 572                 return 0;
 573         }
 574         return a1->attributeID_id > a2->attributeID_id ? 1 : -1;
 575 }
 576
 577 static void replmd_ldb_message_sort(struct ldb_message *msg,
 578                                     const struct dsdb_schema *schema)
 579 {
 580         ldb_qsort(msg->elements, msg->num_elements, sizeof(struct ldb_message_element),
 581                   discard_const_p(void, schema), (ldb_qsort_cmp_fn_t)replmd_ldb_message_element_attid_sort);
 582 }
 583
 584 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
 585                                const struct GUID *invocation_id, uint64_t seq_num,
 586                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted);
 587
 588
 589 /*
 590   fix up linked attributes in replmd_add.
 591   This involves setting up the right meta-data in extended DN
 592   components, and creating backlinks to the object
 593  */
 594 static int replmd_add_fix_la(struct ldb_module *module, struct ldb_message_element *el,
 595                              uint64_t seq_num, const struct GUID *invocationId, time_t t,
 596                              struct GUID *guid, const struct dsdb_attribute *sa)
 597 {
 598         int i;
 599         TALLOC_CTX *tmp_ctx = talloc_new(el->values);
 600         struct ldb_context *ldb = ldb_module_get_ctx(module);
 601         struct dsdb_schema *schema = dsdb_get_schema(ldb);
 602         NTTIME now;
 603
 604         unix_to_nt_time(&now, t);
 605
 606         for (i=0; i<el->num_values; i++) {
 607                 struct ldb_val *v = &el->values[i];
 608                 struct dsdb_dn *dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, v, sa->syntax->ldap_oid);
 609                 struct GUID target_guid;
 610                 NTSTATUS status;
 611                 int ret;
 612
 613                 /* note that the DN already has the extended
 614                    components from the extended_dn_store module */
 615                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
 616                 if (!NT_STATUS_IS_OK(status) || GUID_all_zero(&target_guid)) {
 617                         ret = dsdb_module_guid_by_dn(module, dsdb_dn->dn, &target_guid);
 618                         if (ret != LDB_SUCCESS) {
 619                                 talloc_free(tmp_ctx);
 620                                 return ret;
 621                         }
 622                         ret = dsdb_set_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
 623                         if (ret != LDB_SUCCESS) {
 624                                 talloc_free(tmp_ctx);
 625                                 return ret;
 626                         }
 627                 }
 628
 629                 ret = replmd_build_la_val(el->values, v, dsdb_dn, invocationId,
 630                                           seq_num, seq_num, now, 0, false);
 631                 if (ret != LDB_SUCCESS) {
 632                         talloc_free(tmp_ctx);
 633                         return ret;
 634                 }
 635
 636                 ret = replmd_add_backlink(module, schema, guid, &target_guid, true, sa, false);
 637                 if (ret != LDB_SUCCESS) {
 638                         talloc_free(tmp_ctx);
 639                         return ret;
 640                 }
 641         }
 642
 643         talloc_free(tmp_ctx);
 644         return LDB_SUCCESS;
 645 }
 646
 647
 648 /*
 649   intercept add requests
 650  */
 651 static int replmd_add(struct ldb_module *module, struct ldb_request *req)
 652 {
 653         struct ldb_context *ldb;
 654         struct ldb_control *control;
 655         struct replmd_replicated_request *ac;
 656         enum ndr_err_code ndr_err;
 657         struct ldb_request *down_req;
 658         struct ldb_message *msg;
 659         const DATA_BLOB *guid_blob;
 660         struct GUID guid;
 661         struct replPropertyMetaDataBlob nmd;
 662         struct ldb_val nmd_value;
 663         const struct GUID *our_invocation_id;
 664         time_t t = time(NULL);
 665         NTTIME now;
 666         char *time_str;
 667         int ret;
 668         uint32_t i, ni=0;
 669         bool allow_add_guid = false;
 670         bool remove_current_guid = false;
 671
 672         /* check if there's a show relax control (used by provision to say 'I know what I'm doing') */
 673         control = ldb_request_get_control(req, LDB_CONTROL_RELAX_OID);
 674         if (control) {
 675                 allow_add_guid = true;
 676         }
 677
 678         /* do not manipulate our control entries */
 679         if (ldb_dn_is_special(req->op.add.message->dn)) {
 680                 return ldb_next_request(module, req);
 681         }
 682
 683         ldb = ldb_module_get_ctx(module);
 684
 685         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_add\n");
 686
 687         ac = replmd_ctx_init(module, req);
 688         if (!ac) {
 689                 return LDB_ERR_OPERATIONS_ERROR;
 690         }
 691
 692         guid_blob = ldb_msg_find_ldb_val(req->op.add.message, "objectGUID");
 693         if ( guid_blob != NULL ) {
 694                 if( !allow_add_guid ) {
 695                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 696                               "replmd_add: it's not allowed to add an object with objectGUID\n");
 697                         talloc_free(ac);
 698                         return LDB_ERR_UNWILLING_TO_PERFORM;
 699                 } else {
 700                         NTSTATUS status = GUID_from_data_blob(guid_blob,&guid);
 701                         if ( !NT_STATUS_IS_OK(status)) {
 702                                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 703                                       "replmd_add: Unable to parse as a GUID the attribute objectGUID\n");
 704                                 talloc_free(ac);
 705                                 return LDB_ERR_UNWILLING_TO_PERFORM;
 706                         }
 707                         /* we remove this attribute as it can be a string and will not be treated
 708                         correctly and then we will readd it latter on in the good format*/
 709                         remove_current_guid = true;
 710                 }
 711         } else {
 712                 /* a new GUID */
 713                 guid = GUID_random();
 714         }
 715
 716         /* Get a sequence number from the backend */
 717         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
 718         if (ret != LDB_SUCCESS) {
 719                 talloc_free(ac);
 720                 return ret;
 721         }
 722
 723         /* get our invocationId */
 724         our_invocation_id = samdb_ntds_invocation_id(ldb);
 725         if (!our_invocation_id) {
 726                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 727                               "replmd_add: unable to find invocationId\n");
 728                 talloc_free(ac);
 729                 return LDB_ERR_OPERATIONS_ERROR;
 730         }
 731
 732         /* we have to copy the message as the caller might have it as a const */
 733         msg = ldb_msg_copy_shallow(ac, req->op.add.message);
 734         if (msg == NULL) {
 735                 ldb_oom(ldb);
 736                 talloc_free(ac);
 737                 return LDB_ERR_OPERATIONS_ERROR;
 738         }
 739
 740         /* generated times */
 741         unix_to_nt_time(&now, t);
 742         time_str = ldb_timestring(msg, t);
 743         if (!time_str) {
 744                 ldb_oom(ldb);
 745                 talloc_free(ac);
 746                 return LDB_ERR_OPERATIONS_ERROR;
 747         }
 748         if (remove_current_guid) {
 749                 ldb_msg_remove_attr(msg,"objectGUID");
 750         }
 751
 752         /*
 753          * remove autogenerated attributes
 754          */
 755         ldb_msg_remove_attr(msg, "whenCreated");
 756         ldb_msg_remove_attr(msg, "whenChanged");
 757         ldb_msg_remove_attr(msg, "uSNCreated");
 758         ldb_msg_remove_attr(msg, "uSNChanged");
 759         ldb_msg_remove_attr(msg, "replPropertyMetaData");
 760
 761         /*
 762          * readd replicated attributes
 763          */
 764         ret = ldb_msg_add_string(msg, "whenCreated", time_str);
 765         if (ret != LDB_SUCCESS) {
 766                 ldb_oom(ldb);
 767                 talloc_free(ac);
 768                 return ret;
 769         }
 770
 771         /* build the replication meta_data */
 772         ZERO_STRUCT(nmd);
 773         nmd.version             = 1;
 774         nmd.ctr.ctr1.count      = msg->num_elements;
 775         nmd.ctr.ctr1.array      = talloc_array(msg,
 776                                                struct replPropertyMetaData1,
 777                                                nmd.ctr.ctr1.count);
 778         if (!nmd.ctr.ctr1.array) {
 779                 ldb_oom(ldb);
 780                 talloc_free(ac);
 781                 return LDB_ERR_OPERATIONS_ERROR;
 782         }
 783
 784         for (i=0; i < msg->num_elements; i++) {
 785                 struct ldb_message_element *e = &msg->elements[i];
 786                 struct replPropertyMetaData1 *m = &nmd.ctr.ctr1.array[ni];
 787                 const struct dsdb_attribute *sa;
 788
 789                 if (e->name[0] == '@') continue;
 790
 791                 sa = dsdb_attribute_by_lDAPDisplayName(ac->schema, e->name);
 792                 if (!sa) {
 793                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 794                                       "replmd_add: attribute '%s' not defined in schema\n",
 795                                       e->name);
 796                         talloc_free(ac);
 797                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
 798                 }
 799
 800                 if ((sa->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (sa->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
 801                         /* if the attribute is not replicated (0x00000001)
 802                          * or constructed (0x00000004) it has no metadata
 803                          */
 804                         continue;
 805                 }
 806
 807 #if W2K3_LINKED_ATTRIBUTES
 808                 if (sa->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
 809                         ret = replmd_add_fix_la(module, e, ac->seq_num, our_invocation_id, t, &guid, sa);
 810                         if (ret != LDB_SUCCESS) {
 811                                 talloc_free(ac);
 812                                 return ret;
 813                         }
 814                         /* linked attributes are not stored in
 815                            replPropertyMetaData in FL above w2k */
 816                         continue;
 817                 }
 818 #endif
 819
 820                 m->attid                        = sa->attributeID_id;
 821                 m->version                      = 1;
 822                 m->originating_change_time      = now;
 823                 m->originating_invocation_id    = *our_invocation_id;
 824                 m->originating_usn              = ac->seq_num;
 825                 m->local_usn                    = ac->seq_num;
 826                 ni++;
 827         }
 828
 829         /* fix meta data count */
 830         nmd.ctr.ctr1.count = ni;
 831
 832         /*
 833          * sort meta data array, and move the rdn attribute entry to the end
 834          */
 835         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ac->schema, msg->dn);
 836         if (ret != LDB_SUCCESS) {
 837                 talloc_free(ac);
 838                 return ret;
 839         }
 840
 841         /* generated NDR encoded values */
 842         ndr_err = ndr_push_struct_blob(&nmd_value, msg,
 843                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
 844                                        &nmd,
 845                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
 846         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 847                 ldb_oom(ldb);
 848                 talloc_free(ac);
 849                 return LDB_ERR_OPERATIONS_ERROR;
 850         }
 851
 852         /*
 853          * add the autogenerated values
 854          */
 855         ret = dsdb_msg_add_guid(msg, &guid, "objectGUID");
 856         if (ret != LDB_SUCCESS) {
 857                 ldb_oom(ldb);
 858                 talloc_free(ac);
 859                 return ret;
 860         }
 861         ret = ldb_msg_add_string(msg, "whenChanged", time_str);
 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, "uSNCreated", ac->seq_num);
 868         if (ret != LDB_SUCCESS) {
 869                 ldb_oom(ldb);
 870                 talloc_free(ac);
 871                 return ret;
 872         }
 873         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ac->seq_num);
 874         if (ret != LDB_SUCCESS) {
 875                 ldb_oom(ldb);
 876                 talloc_free(ac);
 877                 return ret;
 878         }
 879         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
 880         if (ret != LDB_SUCCESS) {
 881                 ldb_oom(ldb);
 882                 talloc_free(ac);
 883                 return ret;
 884         }
 885
 886         /*
 887          * sort the attributes by attid before storing the object
 888          */
 889         replmd_ldb_message_sort(msg, ac->schema);
 890
 891         ret = ldb_build_add_req(&down_req, ldb, ac,
 892                                 msg,
 893                                 req->controls,
 894                                 ac, replmd_op_callback,
 895                                 req);
 896         if (ret != LDB_SUCCESS) {
 897                 talloc_free(ac);
 898                 return ret;
 899         }
 900
 901         /* mark the control done */
 902         if (control) {
 903                 control->critical = 0;
 904         }
 905
 906         /* go on with the call chain */
 907         return ldb_next_request(module, down_req);
 908 }
 909
 910
 911 /*
 912  * update the replPropertyMetaData for one element
 913  */
 914 static int replmd_update_rpmd_element(struct ldb_context *ldb,
 915                                       struct ldb_message *msg,
 916                                       struct ldb_message_element *el,
 917                                       struct replPropertyMetaDataBlob *omd,
 918                                       const struct dsdb_schema *schema,
 919                                       uint64_t *seq_num,
 920                                       const struct GUID *our_invocation_id,
 921                                       NTTIME now)
 922 {
 923         int i;
 924         const struct dsdb_attribute *a;
 925         struct replPropertyMetaData1 *md1;
 926
 927         a = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
 928         if (a == NULL) {
 929                 DEBUG(0,(__location__ ": Unable to find attribute %s in schema\n",
 930                          el->name));
 931                 return LDB_ERR_OPERATIONS_ERROR;
 932         }
 933
 934         if ((a->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (a->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
 935                 return LDB_SUCCESS;
 936         }
 937
 938         for (i=0; i<omd->ctr.ctr1.count; i++) {
 939                 if (a->attributeID_id == omd->ctr.ctr1.array[i].attid) break;
 940         }
 941
 942 #if W2K3_LINKED_ATTRIBUTES
 943         if (a->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
 944                 /* linked attributes are not stored in
 945                    replPropertyMetaData in FL above w2k, but we do
 946                    raise the seqnum for the object  */
 947                 if (*seq_num == 0 &&
 948                     ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num) != LDB_SUCCESS) {
 949                         return LDB_ERR_OPERATIONS_ERROR;
 950                 }
 951                 return LDB_SUCCESS;
 952         }
 953 #endif
 954
 955         if (i == omd->ctr.ctr1.count) {
 956                 /* we need to add a new one */
 957                 omd->ctr.ctr1.array = talloc_realloc(msg, omd->ctr.ctr1.array,
 958                                                      struct replPropertyMetaData1, omd->ctr.ctr1.count+1);
 959                 if (omd->ctr.ctr1.array == NULL) {
 960                         ldb_oom(ldb);
 961                         return LDB_ERR_OPERATIONS_ERROR;
 962                 }
 963                 omd->ctr.ctr1.count++;
 964                 ZERO_STRUCT(omd->ctr.ctr1.array[i]);
 965         }
 966
 967         /* Get a new sequence number from the backend. We only do this
 968          * if we have a change that requires a new
 969          * replPropertyMetaData element
 970          */
 971         if (*seq_num == 0) {
 972                 int ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num);
 973                 if (ret != LDB_SUCCESS) {
 974                         return LDB_ERR_OPERATIONS_ERROR;
 975                 }
 976         }
 977
 978         md1 = &omd->ctr.ctr1.array[i];
 979         md1->version++;
 980         md1->attid                     = a->attributeID_id;
 981         md1->originating_change_time   = now;
 982         md1->originating_invocation_id = *our_invocation_id;
 983         md1->originating_usn           = *seq_num;
 984         md1->local_usn                 = *seq_num;
 985
 986         return LDB_SUCCESS;
 987 }
 988
 989 /*
 990  * update the replPropertyMetaData object each time we modify an
 991  * object. This is needed for DRS replication, as the merge on the
 992  * client is based on this object
 993  */
 994 static int replmd_update_rpmd(struct ldb_module *module,
 995                               const struct dsdb_schema *schema,
 996                               struct ldb_message *msg, uint64_t *seq_num,
 997                               time_t t)
 998 {
 999         const struct ldb_val *omd_value;
1000         enum ndr_err_code ndr_err;
1001         struct replPropertyMetaDataBlob omd;
1002         int i;
1003         NTTIME now;
1004         const struct GUID *our_invocation_id;
1005         int ret;
1006         const char *attrs[] = { "replPropertyMetaData" , NULL };
1007         struct ldb_result *res;
1008         struct ldb_context *ldb;
1009
1010         ldb = ldb_module_get_ctx(module);
1011
1012         our_invocation_id = samdb_ntds_invocation_id(ldb);
1013         if (!our_invocation_id) {
1014                 /* this happens during an initial vampire while
1015                    updating the schema */
1016                 DEBUG(5,("No invocationID - skipping replPropertyMetaData update\n"));
1017                 return LDB_SUCCESS;
1018         }
1019
1020         unix_to_nt_time(&now, t);
1021
1022         /* search for the existing replPropertyMetaDataBlob */
1023         ret = dsdb_search_dn_with_deleted(ldb, msg, &res, msg->dn, attrs);
1024         if (ret != LDB_SUCCESS || res->count != 1) {
1025                 DEBUG(0,(__location__ ": Object %s failed to find replPropertyMetaData\n",
1026                          ldb_dn_get_linearized(msg->dn)));
1027                 return LDB_ERR_OPERATIONS_ERROR;
1028         }
1029
1030
1031         omd_value = ldb_msg_find_ldb_val(res->msgs[0], "replPropertyMetaData");
1032         if (!omd_value) {
1033                 DEBUG(0,(__location__ ": Object %s does not have a replPropertyMetaData attribute\n",
1034                          ldb_dn_get_linearized(msg->dn)));
1035                 return LDB_ERR_OPERATIONS_ERROR;
1036         }
1037
1038         ndr_err = ndr_pull_struct_blob(omd_value, msg,
1039                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &omd,
1040                                        (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
1041         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1042                 DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
1043                          ldb_dn_get_linearized(msg->dn)));
1044                 return LDB_ERR_OPERATIONS_ERROR;
1045         }
1046
1047         if (omd.version != 1) {
1048                 DEBUG(0,(__location__ ": bad version %u in replPropertyMetaData for %s\n",
1049                          omd.version, ldb_dn_get_linearized(msg->dn)));
1050                 return LDB_ERR_OPERATIONS_ERROR;
1051         }
1052
1053         for (i=0; i<msg->num_elements; i++) {
1054                 ret = replmd_update_rpmd_element(ldb, msg, &msg->elements[i], &omd, schema, seq_num,
1055                                                  our_invocation_id, now);
1056                 if (ret != LDB_SUCCESS) {
1057                         return ret;
1058                 }
1059         }
1060
1061         /*
1062          * replmd_update_rpmd_element has done an update if the
1063          * seq_num is set
1064          */
1065         if (*seq_num != 0) {
1066                 struct ldb_val *md_value;
1067                 struct ldb_message_element *el;
1068
1069                 md_value = talloc(msg, struct ldb_val);
1070                 if (md_value == NULL) {
1071                         ldb_oom(ldb);
1072                         return LDB_ERR_OPERATIONS_ERROR;
1073                 }
1074
1075                 ret = replmd_replPropertyMetaDataCtr1_sort(&omd.ctr.ctr1, schema, msg->dn);
1076                 if (ret != LDB_SUCCESS) {
1077                         return ret;
1078                 }
1079
1080                 ndr_err = ndr_push_struct_blob(md_value, msg,
1081                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
1082                                                &omd,
1083                                                (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
1084                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1085                         DEBUG(0,(__location__ ": Failed to marshall replPropertyMetaData for %s\n",
1086                                  ldb_dn_get_linearized(msg->dn)));
1087                         return LDB_ERR_OPERATIONS_ERROR;
1088                 }
1089
1090                 ret = ldb_msg_add_empty(msg, "replPropertyMetaData", LDB_FLAG_MOD_REPLACE, &el);
1091                 if (ret != LDB_SUCCESS) {
1092                         DEBUG(0,(__location__ ": Failed to add updated replPropertyMetaData %s\n",
1093                                  ldb_dn_get_linearized(msg->dn)));
1094                         return ret;
1095                 }
1096
1097                 el->num_values = 1;
1098                 el->values = md_value;
1099         }
1100
1101         return LDB_SUCCESS;
1102 }
1103
1104
1105 struct parsed_dn {
1106         struct dsdb_dn *dsdb_dn;
1107         struct GUID *guid;
1108         struct ldb_val *v;
1109 };
1110
1111 static int parsed_dn_compare(struct parsed_dn *pdn1, struct parsed_dn *pdn2)
1112 {
1113         return GUID_compare(pdn1->guid, pdn2->guid);
1114 }
1115
1116 static struct parsed_dn *parsed_dn_find(struct parsed_dn *pdn, int count, struct GUID *guid, struct ldb_dn *dn)
1117 {
1118         struct parsed_dn *ret;
1119         if (dn && GUID_all_zero(guid)) {
1120                 /* when updating a link using DRS, we sometimes get a
1121                    NULL GUID. We then need to try and match by DN */
1122                 int i;
1123                 for (i=0; i<count; i++) {
1124                         if (ldb_dn_compare(pdn[i].dsdb_dn->dn, dn) == 0) {
1125                                 dsdb_get_extended_dn_guid(pdn[i].dsdb_dn->dn, guid, "GUID");
1126                                 return &pdn[i];
1127                         }
1128                 }
1129                 return NULL;
1130         }
1131         BINARY_ARRAY_SEARCH(pdn, count, guid, guid, GUID_compare, ret);
1132         return ret;
1133 }
1134
1135 /*
1136   get a series of message element values as an array of DNs and GUIDs
1137   the result is sorted by GUID
1138  */
1139 static int get_parsed_dns(struct ldb_module *module, TALLOC_CTX *mem_ctx,
1140                           struct ldb_message_element *el, struct parsed_dn **pdn,
1141                           const char *ldap_oid)
1142 {
1143         int i;
1144         struct ldb_context *ldb = ldb_module_get_ctx(module);
1145
1146         if (el == NULL) {
1147                 *pdn = NULL;
1148                 return LDB_SUCCESS;
1149         }
1150
1151         (*pdn) = talloc_array(mem_ctx, struct parsed_dn, el->num_values);
1152         if (!*pdn) {
1153                 ldb_module_oom(module);
1154                 return LDB_ERR_OPERATIONS_ERROR;
1155         }
1156
1157         for (i=0; i<el->num_values; i++) {
1158                 struct ldb_val *v = &el->values[i];
1159                 NTSTATUS status;
1160                 struct ldb_dn *dn;
1161                 struct parsed_dn *p;
1162
1163                 p = &(*pdn)[i];
1164
1165                 p->dsdb_dn = dsdb_dn_parse(*pdn, ldb, v, ldap_oid);
1166                 if (p->dsdb_dn == NULL) {
1167                         return LDB_ERR_INVALID_DN_SYNTAX;
1168                 }
1169
1170                 dn = p->dsdb_dn->dn;
1171
1172                 p->guid = talloc(*pdn, struct GUID);
1173                 if (p->guid == NULL) {
1174                         ldb_module_oom(module);
1175                         return LDB_ERR_OPERATIONS_ERROR;
1176                 }
1177
1178                 status = dsdb_get_extended_dn_guid(dn, p->guid, "GUID");
1179                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1180                         /* we got a DN without a GUID - go find the GUID */
1181                         int ret = dsdb_module_guid_by_dn(module, dn, p->guid);
1182                         if (ret != LDB_SUCCESS) {
1183                                 ldb_asprintf_errstring(ldb, "Unable to find GUID for DN %s\n",
1184                                                        ldb_dn_get_linearized(dn));
1185                                 return ret;
1186                         }
1187                         ret = dsdb_set_extended_dn_guid(dn, p->guid, "GUID");
1188                         if (ret != LDB_SUCCESS) {
1189                                 return ret;
1190                         }
1191                 } else if (!NT_STATUS_IS_OK(status)) {
1192                         return LDB_ERR_OPERATIONS_ERROR;
1193                 }
1194
1195                 /* keep a pointer to the original ldb_val */
1196                 p->v = v;
1197         }
1198
1199         qsort(*pdn, el->num_values, sizeof((*pdn)[0]), (comparison_fn_t)parsed_dn_compare);
1200
1201         return LDB_SUCCESS;
1202 }
1203
1204 /*
1205   build a new extended DN, including all meta data fields
1206
1207   RMD_FLAGS           = DSDB_RMD_FLAG_* bits
1208   RMD_ADDTIME         = originating_add_time
1209   RMD_INVOCID         = originating_invocation_id
1210   RMD_CHANGETIME      = originating_change_time
1211   RMD_ORIGINATING_USN = originating_usn
1212   RMD_LOCAL_USN       = local_usn
1213   RMD_VERSION         = version
1214  */
1215 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1216                                const struct GUID *invocation_id, uint64_t seq_num,
1217                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted)
1218 {
1219         struct ldb_dn *dn = dsdb_dn->dn;
1220         const char *tstring, *usn_string, *flags_string;
1221         struct ldb_val tval;
1222         struct ldb_val iid;
1223         struct ldb_val usnv, local_usnv;
1224         struct ldb_val vers, flagsv;
1225         NTSTATUS status;
1226         int ret;
1227         const char *dnstring;
1228         char *vstring;
1229         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1230
1231         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1232         if (!tstring) {
1233                 return LDB_ERR_OPERATIONS_ERROR;
1234         }
1235         tval = data_blob_string_const(tstring);
1236
1237         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1238         if (!usn_string) {
1239                 return LDB_ERR_OPERATIONS_ERROR;
1240         }
1241         usnv = data_blob_string_const(usn_string);
1242
1243         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1244         if (!usn_string) {
1245                 return LDB_ERR_OPERATIONS_ERROR;
1246         }
1247         local_usnv = data_blob_string_const(usn_string);
1248
1249         vstring = talloc_asprintf(mem_ctx, "%lu", (unsigned long)version);
1250         if (!vstring) {
1251                 return LDB_ERR_OPERATIONS_ERROR;
1252         }
1253         vers = data_blob_string_const(vstring);
1254
1255         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1256         if (!NT_STATUS_IS_OK(status)) {
1257                 return LDB_ERR_OPERATIONS_ERROR;
1258         }
1259
1260         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1261         if (!flags_string) {
1262                 return LDB_ERR_OPERATIONS_ERROR;
1263         }
1264         flagsv = data_blob_string_const(flags_string);
1265
1266         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1267         if (ret != LDB_SUCCESS) return ret;
1268         ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", &tval);
1269         if (ret != LDB_SUCCESS) return ret;
1270         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1271         if (ret != LDB_SUCCESS) return ret;
1272         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1273         if (ret != LDB_SUCCESS) return ret;
1274         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1275         if (ret != LDB_SUCCESS) return ret;
1276         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1277         if (ret != LDB_SUCCESS) return ret;
1278         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1279         if (ret != LDB_SUCCESS) return ret;
1280
1281         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1282         if (dnstring == NULL) {
1283                 return LDB_ERR_OPERATIONS_ERROR;
1284         }
1285         *v = data_blob_string_const(dnstring);
1286
1287         return LDB_SUCCESS;
1288 }
1289
1290 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1291                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1292                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1293                                 uint32_t version, bool deleted);
1294
1295 /*
1296   check if any links need upgrading from w2k format
1297  */
1298 static int replmd_check_upgrade_links(struct parsed_dn *dns, uint32_t count, const struct GUID *invocation_id)
1299 {
1300         int i;
1301         for (i=0; i<count; i++) {
1302                 NTSTATUS status;
1303                 uint32_t version;
1304                 int ret;
1305
1306                 status = dsdb_get_extended_dn_uint32(dns[i].dsdb_dn->dn, &version, "RMD_VERSION");
1307                 if (!NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1308                         continue;
1309                 }
1310
1311                 /* it's an old one that needs upgrading */
1312                 ret = replmd_update_la_val(dns, dns[i].v, dns[i].dsdb_dn, dns[i].dsdb_dn, invocation_id,
1313                                            1, 1, 0, 0, false);
1314                 if (ret != LDB_SUCCESS) {
1315                         return ret;
1316                 }
1317         }
1318         return LDB_SUCCESS;
1319 }
1320
1321 /*
1322   update an extended DN, including all meta data fields
1323
1324   see replmd_build_la_val for value names
1325  */
1326 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1327                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1328                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1329                                 uint32_t version, bool deleted)
1330 {
1331         struct ldb_dn *dn = dsdb_dn->dn;
1332         const char *tstring, *usn_string, *flags_string;
1333         struct ldb_val tval;
1334         struct ldb_val iid;
1335         struct ldb_val usnv, local_usnv;
1336         struct ldb_val vers, flagsv;
1337         const struct ldb_val *old_addtime;
1338         uint32_t old_version;
1339         NTSTATUS status;
1340         int ret;
1341         const char *dnstring;
1342         char *vstring;
1343         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1344
1345         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1346         if (!tstring) {
1347                 return LDB_ERR_OPERATIONS_ERROR;
1348         }
1349         tval = data_blob_string_const(tstring);
1350
1351         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1352         if (!usn_string) {
1353                 return LDB_ERR_OPERATIONS_ERROR;
1354         }
1355         usnv = data_blob_string_const(usn_string);
1356
1357         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1358         if (!usn_string) {
1359                 return LDB_ERR_OPERATIONS_ERROR;
1360         }
1361         local_usnv = data_blob_string_const(usn_string);
1362
1363         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1364         if (!NT_STATUS_IS_OK(status)) {
1365                 return LDB_ERR_OPERATIONS_ERROR;
1366         }
1367
1368         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1369         if (!flags_string) {
1370                 return LDB_ERR_OPERATIONS_ERROR;
1371         }
1372         flagsv = data_blob_string_const(flags_string);
1373
1374         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1375         if (ret != LDB_SUCCESS) return ret;
1376
1377         /* get the ADDTIME from the original */
1378         old_addtime = ldb_dn_get_extended_component(old_dsdb_dn->dn, "RMD_ADDTIME");
1379         if (old_addtime == NULL) {
1380                 old_addtime = &tval;
1381         }
1382         if (dsdb_dn != old_dsdb_dn) {
1383                 ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", old_addtime);
1384                 if (ret != LDB_SUCCESS) return ret;
1385         }
1386
1387         /* use our invocation id */
1388         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1389         if (ret != LDB_SUCCESS) return ret;
1390
1391         /* changetime is the current time */
1392         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1393         if (ret != LDB_SUCCESS) return ret;
1394
1395         /* update the USN */
1396         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1397         if (ret != LDB_SUCCESS) return ret;
1398
1399         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1400         if (ret != LDB_SUCCESS) return ret;
1401
1402         /* increase the version by 1 */
1403         status = dsdb_get_extended_dn_uint32(old_dsdb_dn->dn, &old_version, "RMD_VERSION");
1404         if (NT_STATUS_IS_OK(status) && old_version >= version) {
1405                 version = old_version+1;
1406         }
1407         vstring = talloc_asprintf(dn, "%lu", (unsigned long)version);
1408         vers = data_blob_string_const(vstring);
1409         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1410         if (ret != LDB_SUCCESS) return ret;
1411
1412         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1413         if (dnstring == NULL) {
1414                 return LDB_ERR_OPERATIONS_ERROR;
1415         }
1416         *v = data_blob_string_const(dnstring);
1417
1418         return LDB_SUCCESS;
1419 }
1420
1421 /*
1422   handle adding a linked attribute
1423  */
1424 static int replmd_modify_la_add(struct ldb_module *module,
1425                                 struct dsdb_schema *schema,
1426                                 struct ldb_message *msg,
1427                                 struct ldb_message_element *el,
1428                                 struct ldb_message_element *old_el,
1429                                 const struct dsdb_attribute *schema_attr,
1430                                 uint64_t seq_num,
1431                                 time_t t,
1432                                 struct GUID *msg_guid)
1433 {
1434         int i;
1435         struct parsed_dn *dns, *old_dns;
1436         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1437         int ret;
1438         struct ldb_val *new_values = NULL;
1439         unsigned int num_new_values = 0;
1440         unsigned old_num_values = old_el?old_el->num_values:0;
1441         const struct GUID *invocation_id;
1442         struct ldb_context *ldb = ldb_module_get_ctx(module);
1443         NTTIME now;
1444
1445         unix_to_nt_time(&now, t);
1446
1447         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1448         if (ret != LDB_SUCCESS) {
1449                 talloc_free(tmp_ctx);
1450                 return ret;
1451         }
1452
1453         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1454         if (ret != LDB_SUCCESS) {
1455                 talloc_free(tmp_ctx);
1456                 return ret;
1457         }
1458
1459         invocation_id = samdb_ntds_invocation_id(ldb);
1460         if (!invocation_id) {
1461                 talloc_free(tmp_ctx);
1462                 return LDB_ERR_OPERATIONS_ERROR;
1463         }
1464
1465         ret = replmd_check_upgrade_links(old_dns, old_num_values, invocation_id);
1466         if (ret != LDB_SUCCESS) {
1467                 talloc_free(tmp_ctx);
1468                 return ret;
1469         }
1470
1471         /* for each new value, see if it exists already with the same GUID */
1472         for (i=0; i<el->num_values; i++) {
1473                 struct parsed_dn *p = parsed_dn_find(old_dns, old_num_values, dns[i].guid, NULL);
1474                 if (p == NULL) {
1475                         /* this is a new linked attribute value */
1476                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val, num_new_values+1);
1477                         if (new_values == NULL) {
1478                                 ldb_module_oom(module);
1479                                 talloc_free(tmp_ctx);
1480                                 return LDB_ERR_OPERATIONS_ERROR;
1481                         }
1482                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1483                                                   invocation_id, seq_num, seq_num, now, 0, false);
1484                         if (ret != LDB_SUCCESS) {
1485                                 talloc_free(tmp_ctx);
1486                                 return ret;
1487                         }
1488                         num_new_values++;
1489                 } else {
1490                         /* this is only allowed if the GUID was
1491                            previously deleted. */
1492                         uint32_t rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1493
1494                         if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
1495                                 ldb_asprintf_errstring(ldb, "Attribute %s already exists for target GUID %s",
1496                                                        el->name, GUID_string(tmp_ctx, p->guid));
1497                                 talloc_free(tmp_ctx);
1498                                 return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
1499                         }
1500                         ret = replmd_update_la_val(old_el->values, p->v, dns[i].dsdb_dn, p->dsdb_dn,
1501                                                    invocation_id, seq_num, seq_num, now, 0, false);
1502                         if (ret != LDB_SUCCESS) {
1503                                 talloc_free(tmp_ctx);
1504                                 return ret;
1505                         }
1506                 }
1507
1508                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, true);
1509                 if (ret != LDB_SUCCESS) {
1510                         talloc_free(tmp_ctx);
1511                         return ret;
1512                 }
1513         }
1514
1515         /* add the new ones on to the end of the old values, constructing a new el->values */
1516         el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1517                                     struct ldb_val,
1518                                     old_num_values+num_new_values);
1519         if (el->values == NULL) {
1520                 ldb_module_oom(module);
1521                 return LDB_ERR_OPERATIONS_ERROR;
1522         }
1523
1524         memcpy(&el->values[old_num_values], new_values, num_new_values*sizeof(struct ldb_val));
1525         el->num_values = old_num_values + num_new_values;
1526
1527         talloc_steal(msg->elements, el->values);
1528         talloc_steal(el->values, new_values);
1529
1530         talloc_free(tmp_ctx);
1531
1532         /* we now tell the backend to replace all existing values
1533            with the one we have constructed */
1534         el->flags = LDB_FLAG_MOD_REPLACE;
1535
1536         return LDB_SUCCESS;
1537 }
1538
1539
1540 /*
1541   handle deleting all active linked attributes
1542  */
1543 static int replmd_modify_la_delete(struct ldb_module *module,
1544                                    struct dsdb_schema *schema,
1545                                    struct ldb_message *msg,
1546                                    struct ldb_message_element *el,
1547                                    struct ldb_message_element *old_el,
1548                                    const struct dsdb_attribute *schema_attr,
1549                                    uint64_t seq_num,
1550                                    time_t t,
1551                                    struct GUID *msg_guid)
1552 {
1553         int i;
1554         struct parsed_dn *dns, *old_dns;
1555         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1556         int ret;
1557         const struct GUID *invocation_id;
1558         struct ldb_context *ldb = ldb_module_get_ctx(module);
1559         NTTIME now;
1560
1561         unix_to_nt_time(&now, t);
1562
1563         /* check if there is nothing to delete */
1564         if ((!old_el || old_el->num_values == 0) &&
1565             el->num_values == 0) {
1566                 return LDB_SUCCESS;
1567         }
1568
1569         if (!old_el || old_el->num_values == 0) {
1570                 return LDB_ERR_NO_SUCH_ATTRIBUTE;
1571         }
1572
1573         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1574         if (ret != LDB_SUCCESS) {
1575                 talloc_free(tmp_ctx);
1576                 return ret;
1577         }
1578
1579         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1580         if (ret != LDB_SUCCESS) {
1581                 talloc_free(tmp_ctx);
1582                 return ret;
1583         }
1584
1585         invocation_id = samdb_ntds_invocation_id(ldb);
1586         if (!invocation_id) {
1587                 return LDB_ERR_OPERATIONS_ERROR;
1588         }
1589
1590         ret = replmd_check_upgrade_links(old_dns, old_el->num_values, invocation_id);
1591         if (ret != LDB_SUCCESS) {
1592                 talloc_free(tmp_ctx);
1593                 return ret;
1594         }
1595
1596         el->values = NULL;
1597
1598         /* see if we are being asked to delete any links that
1599            don't exist or are already deleted */
1600         for (i=0; i<el->num_values; i++) {
1601                 struct parsed_dn *p = &dns[i];
1602                 struct parsed_dn *p2;
1603                 uint32_t rmd_flags;
1604
1605                 p2 = parsed_dn_find(old_dns, old_el->num_values, p->guid, NULL);
1606                 if (!p2) {
1607                         ldb_asprintf_errstring(ldb, "Attribute %s doesn't exist for target GUID %s",
1608                                                el->name, GUID_string(tmp_ctx, p->guid));
1609                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1610                 }
1611                 rmd_flags = dsdb_dn_rmd_flags(p2->dsdb_dn->dn);
1612                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) {
1613                         ldb_asprintf_errstring(ldb, "Attribute %s already deleted for target GUID %s",
1614                                                el->name, GUID_string(tmp_ctx, p->guid));
1615                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1616                 }
1617         }
1618
1619         /* for each new value, see if it exists already with the same GUID
1620            if it is not already deleted and matches the delete list then delete it
1621         */
1622         for (i=0; i<old_el->num_values; i++) {
1623                 struct parsed_dn *p = &old_dns[i];
1624                 uint32_t rmd_flags;
1625
1626                 if (el->num_values && parsed_dn_find(dns, el->num_values, p->guid, NULL) == NULL) {
1627                         continue;
1628                 }
1629
1630                 rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1631                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1632
1633                 ret = replmd_update_la_val(old_el->values, p->v, p->dsdb_dn, p->dsdb_dn,
1634                                            invocation_id, seq_num, seq_num, now, 0, true);
1635                 if (ret != LDB_SUCCESS) {
1636                         talloc_free(tmp_ctx);
1637                         return ret;
1638                 }
1639
1640                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, true);
1641                 if (ret != LDB_SUCCESS) {
1642                         talloc_free(tmp_ctx);
1643                         return ret;
1644                 }
1645         }
1646
1647         el->values = talloc_steal(msg->elements, old_el->values);
1648         el->num_values = old_el->num_values;
1649
1650         talloc_free(tmp_ctx);
1651
1652         /* we now tell the backend to replace all existing values
1653            with the one we have constructed */
1654         el->flags = LDB_FLAG_MOD_REPLACE;
1655
1656         return LDB_SUCCESS;
1657 }
1658
1659 /*
1660   handle replacing a linked attribute
1661  */
1662 static int replmd_modify_la_replace(struct ldb_module *module,
1663                                     struct dsdb_schema *schema,
1664                                     struct ldb_message *msg,
1665                                     struct ldb_message_element *el,
1666                                     struct ldb_message_element *old_el,
1667                                     const struct dsdb_attribute *schema_attr,
1668                                     uint64_t seq_num,
1669                                     time_t t,
1670                                     struct GUID *msg_guid)
1671 {
1672         int i;
1673         struct parsed_dn *dns, *old_dns;
1674         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1675         int ret;
1676         const struct GUID *invocation_id;
1677         struct ldb_context *ldb = ldb_module_get_ctx(module);
1678         struct ldb_val *new_values = NULL;
1679         uint32_t num_new_values = 0;
1680         unsigned old_num_values = old_el?old_el->num_values:0;
1681         NTTIME now;
1682
1683         unix_to_nt_time(&now, t);
1684
1685         /* check if there is nothing to replace */
1686         if ((!old_el || old_el->num_values == 0) &&
1687             el->num_values == 0) {
1688                 return LDB_SUCCESS;
1689         }
1690
1691         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1692         if (ret != LDB_SUCCESS) {
1693                 talloc_free(tmp_ctx);
1694                 return ret;
1695         }
1696
1697         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1698         if (ret != LDB_SUCCESS) {
1699                 talloc_free(tmp_ctx);
1700                 return ret;
1701         }
1702
1703         invocation_id = samdb_ntds_invocation_id(ldb);
1704         if (!invocation_id) {
1705                 return LDB_ERR_OPERATIONS_ERROR;
1706         }
1707
1708         ret = replmd_check_upgrade_links(old_dns, old_num_values, invocation_id);
1709         if (ret != LDB_SUCCESS) {
1710                 talloc_free(tmp_ctx);
1711                 return ret;
1712         }
1713
1714         /* mark all the old ones as deleted */
1715         for (i=0; i<old_num_values; i++) {
1716                 struct parsed_dn *old_p = &old_dns[i];
1717                 struct parsed_dn *p;
1718                 uint32_t rmd_flags = dsdb_dn_rmd_flags(old_p->dsdb_dn->dn);
1719
1720                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1721
1722                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, false);
1723                 if (ret != LDB_SUCCESS) {
1724                         talloc_free(tmp_ctx);
1725                         return ret;
1726                 }
1727
1728                 p = parsed_dn_find(dns, el->num_values, old_p->guid, NULL);
1729                 if (p) {
1730                         /* we don't delete it if we are re-adding it */
1731                         continue;
1732                 }
1733
1734                 ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn, old_p->dsdb_dn,
1735                                            invocation_id, seq_num, seq_num, now, 0, true);
1736                 if (ret != LDB_SUCCESS) {
1737                         talloc_free(tmp_ctx);
1738                         return ret;
1739                 }
1740         }
1741
1742         /* for each new value, either update its meta-data, or add it
1743          * to old_el
1744         */
1745         for (i=0; i<el->num_values; i++) {
1746                 struct parsed_dn *p = &dns[i], *old_p;
1747
1748                 if (old_dns &&
1749                     (old_p = parsed_dn_find(old_dns,
1750                                             old_num_values, p->guid, NULL)) != NULL) {
1751                         /* update in place */
1752                         ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn,
1753                                                    old_p->dsdb_dn, invocation_id,
1754                                                    seq_num, seq_num, now, 0, false);
1755                         if (ret != LDB_SUCCESS) {
1756                                 talloc_free(tmp_ctx);
1757                                 return ret;
1758                         }
1759                 } else {
1760                         /* add a new one */
1761                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val,
1762                                                     num_new_values+1);
1763                         if (new_values == NULL) {
1764                                 ldb_module_oom(module);
1765                                 talloc_free(tmp_ctx);
1766                                 return LDB_ERR_OPERATIONS_ERROR;
1767                         }
1768                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1769                                                   invocation_id, seq_num, seq_num, now, 0, false);
1770                         if (ret != LDB_SUCCESS) {
1771                                 talloc_free(tmp_ctx);
1772                                 return ret;
1773                         }
1774                         num_new_values++;
1775                 }
1776
1777                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, false);
1778                 if (ret != LDB_SUCCESS) {
1779                         talloc_free(tmp_ctx);
1780                         return ret;
1781                 }
1782         }
1783
1784         /* add the new values to the end of old_el */
1785         if (num_new_values != 0) {
1786                 el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1787                                             struct ldb_val, old_num_values+num_new_values);
1788                 if (el->values == NULL) {
1789                         ldb_module_oom(module);
1790                         return LDB_ERR_OPERATIONS_ERROR;
1791                 }
1792                 memcpy(&el->values[old_num_values], &new_values[0],
1793                        sizeof(struct ldb_val)*num_new_values);
1794                 el->num_values = old_num_values + num_new_values;
1795                 talloc_steal(msg->elements, new_values);
1796         } else {
1797                 el->values = old_el->values;
1798                 el->num_values = old_el->num_values;
1799                 talloc_steal(msg->elements, el->values);
1800         }
1801
1802         talloc_free(tmp_ctx);
1803
1804         /* we now tell the backend to replace all existing values
1805            with the one we have constructed */
1806         el->flags = LDB_FLAG_MOD_REPLACE;
1807
1808         return LDB_SUCCESS;
1809 }
1810
1811
1812 /*
1813   handle linked attributes in modify requests
1814  */
1815 static int replmd_modify_handle_linked_attribs(struct ldb_module *module,
1816                                                struct ldb_message *msg,
1817                                                uint64_t seq_num, time_t t)
1818 {
1819         struct ldb_result *res;
1820         int ret, i;
1821         struct ldb_context *ldb = ldb_module_get_ctx(module);
1822         struct ldb_message *old_msg;
1823         struct dsdb_schema *schema = dsdb_get_schema(ldb);
1824         struct GUID old_guid;
1825
1826         if (seq_num == 0) {
1827                 /* there the replmd_update_rpmd code has already
1828                  * checked and saw that there are no linked
1829                  * attributes */
1830                 return LDB_SUCCESS;
1831         }
1832
1833 #if !W2K3_LINKED_ATTRIBUTES
1834         return LDB_SUCCESS;
1835 #endif
1836
1837         if (dsdb_functional_level(ldb) == DS_DOMAIN_FUNCTION_2000) {
1838                 /* don't do anything special for linked attributes */
1839                 return LDB_SUCCESS;
1840         }
1841
1842         ret = dsdb_module_search_dn(module, msg, &res, msg->dn, NULL,
1843                                     DSDB_SEARCH_SHOW_DELETED |
1844                                     DSDB_SEARCH_REVEAL_INTERNALS |
1845                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
1846         if (ret != LDB_SUCCESS) {
1847                 return ret;
1848         }
1849         old_msg = res->msgs[0];
1850
1851         old_guid = samdb_result_guid(old_msg, "objectGUID");
1852
1853         for (i=0; i<msg->num_elements; i++) {
1854                 struct ldb_message_element *el = &msg->elements[i];
1855                 struct ldb_message_element *old_el, *new_el;
1856                 const struct dsdb_attribute *schema_attr
1857                         = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
1858                 if (!schema_attr) {
1859                         ldb_asprintf_errstring(ldb,
1860                                                "attribute %s is not a valid attribute in schema", el->name);
1861                         return LDB_ERR_OBJECT_CLASS_VIOLATION;
1862                 }
1863                 if (schema_attr->linkID == 0) {
1864                         continue;
1865                 }
1866                 if ((schema_attr->linkID & 1) == 1) {
1867                         /* Odd is for the target.  Illegal to modify */
1868                         ldb_asprintf_errstring(ldb,
1869                                                "attribute %s must not be modified directly, it is a linked attribute", el->name);
1870                         return LDB_ERR_UNWILLING_TO_PERFORM;
1871                 }
1872                 old_el = ldb_msg_find_element(old_msg, el->name);
1873                 switch (el->flags & LDB_FLAG_MOD_MASK) {
1874                 case LDB_FLAG_MOD_REPLACE:
1875                         ret = replmd_modify_la_replace(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
1876                         break;
1877                 case LDB_FLAG_MOD_DELETE:
1878                         ret = replmd_modify_la_delete(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
1879                         break;
1880                 case LDB_FLAG_MOD_ADD:
1881                         ret = replmd_modify_la_add(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
1882                         break;
1883                 default:
1884                         ldb_asprintf_errstring(ldb,
1885                                                "invalid flags 0x%x for %s linked attribute",
1886                                                el->flags, el->name);
1887                         return LDB_ERR_UNWILLING_TO_PERFORM;
1888                 }
1889                 if (ret != LDB_SUCCESS) {
1890                         return ret;
1891                 }
1892                 if (old_el) {
1893                         ldb_msg_remove_attr(old_msg, el->name);
1894                 }
1895                 ldb_msg_add_empty(old_msg, el->name, 0, &new_el);
1896                 new_el->num_values = el->num_values;
1897                 new_el->values = talloc_steal(msg->elements, el->values);
1898
1899                 /* TODO: this relises a bit too heavily on the exact
1900                    behaviour of ldb_msg_find_element and
1901                    ldb_msg_remove_element */
1902                 old_el = ldb_msg_find_element(msg, el->name);
1903                 if (old_el != el) {
1904                         ldb_msg_remove_element(msg, old_el);
1905                         i--;
1906                 }
1907         }
1908
1909         talloc_free(res);
1910         return ret;
1911 }
1912
1913
1914
1915 static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
1916 {
1917         struct ldb_context *ldb;
1918         struct replmd_replicated_request *ac;
1919         struct ldb_request *down_req;
1920         struct ldb_message *msg;
1921         time_t t = time(NULL);
1922         int ret;
1923
1924         /* do not manipulate our control entries */
1925         if (ldb_dn_is_special(req->op.mod.message->dn)) {
1926                 return ldb_next_request(module, req);
1927         }
1928
1929         ldb = ldb_module_get_ctx(module);
1930
1931         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_modify\n");
1932
1933         ac = replmd_ctx_init(module, req);
1934         if (!ac) {
1935                 return LDB_ERR_OPERATIONS_ERROR;
1936         }
1937
1938         /* we have to copy the message as the caller might have it as a const */
1939         msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
1940         if (msg == NULL) {
1941                 ldb_oom(ldb);
1942                 talloc_free(ac);
1943                 return LDB_ERR_OPERATIONS_ERROR;
1944         }
1945
1946         ldb_msg_remove_attr(msg, "whenChanged");
1947         ldb_msg_remove_attr(msg, "uSNChanged");
1948
1949         ret = replmd_update_rpmd(module, ac->schema, msg, &ac->seq_num, t);
1950         if (ret != LDB_SUCCESS) {
1951                 talloc_free(ac);
1952                 return ret;
1953         }
1954
1955         ret = replmd_modify_handle_linked_attribs(module, msg, ac->seq_num, t);
1956         if (ret != LDB_SUCCESS) {
1957                 talloc_free(ac);
1958                 return ret;
1959         }
1960
1961         /* TODO:
1962          * - replace the old object with the newly constructed one
1963          */
1964
1965         ret = ldb_build_mod_req(&down_req, ldb, ac,
1966                                 msg,
1967                                 req->controls,
1968                                 ac, replmd_op_callback,
1969                                 req);
1970         if (ret != LDB_SUCCESS) {
1971                 talloc_free(ac);
1972                 return ret;
1973         }
1974         talloc_steal(down_req, msg);
1975
1976         /* we only change whenChanged and uSNChanged if the seq_num
1977            has changed */
1978         if (ac->seq_num != 0) {
1979                 if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
1980                         talloc_free(ac);
1981                         return ret;
1982                 }
1983
1984                 if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
1985                         talloc_free(ac);
1986                         return ret;
1987                 }
1988         }
1989
1990         /* go on with the call chain */
1991         return ldb_next_request(module, down_req);
1992 }
1993
1994 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares);
1995
1996 /*
1997   handle a rename request
1998
1999   On a rename we need to do an extra ldb_modify which sets the
2000   whenChanged and uSNChanged attributes.  We do this in a callback after the success.
2001  */
2002 static int replmd_rename(struct ldb_module *module, struct ldb_request *req)
2003 {
2004         struct ldb_context *ldb;
2005         struct replmd_replicated_request *ac;
2006         int ret;
2007         struct ldb_request *down_req;
2008
2009         /* do not manipulate our control entries */
2010         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2011                 return ldb_next_request(module, req);
2012         }
2013
2014         ldb = ldb_module_get_ctx(module);
2015
2016         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_rename\n");
2017
2018         ac = replmd_ctx_init(module, req);
2019         if (!ac) {
2020                 return LDB_ERR_OPERATIONS_ERROR;
2021         }
2022         ret = ldb_build_rename_req(&down_req, ldb, ac,
2023                                    ac->req->op.rename.olddn,
2024                                    ac->req->op.rename.newdn,
2025                                    ac->req->controls,
2026                                    ac, replmd_rename_callback,
2027                                    ac->req);
2028
2029         if (ret != LDB_SUCCESS) {
2030                 talloc_free(ac);
2031                 return ret;
2032         }
2033
2034         /* go on with the call chain */
2035         return ldb_next_request(module, down_req);
2036 }
2037
2038 /* After the rename is compleated, update the whenchanged etc */
2039 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares)
2040 {
2041         struct ldb_context *ldb;
2042         struct replmd_replicated_request *ac;
2043         struct ldb_request *down_req;
2044         struct ldb_message *msg;
2045         time_t t = time(NULL);
2046         int ret;
2047
2048         ac = talloc_get_type(req->context, struct replmd_replicated_request);
2049         ldb = ldb_module_get_ctx(ac->module);
2050
2051         if (ares->error != LDB_SUCCESS) {
2052                 return ldb_module_done(ac->req, ares->controls,
2053                                         ares->response, ares->error);
2054         }
2055
2056         if (ares->type != LDB_REPLY_DONE) {
2057                 ldb_set_errstring(ldb,
2058                                   "invalid ldb_reply_type in callback");
2059                 talloc_free(ares);
2060                 return ldb_module_done(ac->req, NULL, NULL,
2061                                         LDB_ERR_OPERATIONS_ERROR);
2062         }
2063
2064         /* Get a sequence number from the backend */
2065         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
2066         if (ret != LDB_SUCCESS) {
2067                 return ret;
2068         }
2069
2070         /* TODO:
2071          * - replace the old object with the newly constructed one
2072          */
2073
2074         msg = ldb_msg_new(ac);
2075         if (msg == NULL) {
2076                 ldb_oom(ldb);
2077                 return LDB_ERR_OPERATIONS_ERROR;
2078         }
2079
2080         msg->dn = ac->req->op.rename.newdn;
2081
2082         ret = ldb_build_mod_req(&down_req, ldb, ac,
2083                                 msg,
2084                                 req->controls,
2085                                 ac, replmd_op_callback,
2086                                 req);
2087
2088         if (ret != LDB_SUCCESS) {
2089                 talloc_free(ac);
2090                 return ret;
2091         }
2092         talloc_steal(down_req, msg);
2093
2094         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
2095                 talloc_free(ac);
2096                 return ret;
2097         }
2098
2099         if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
2100                 talloc_free(ac);
2101                 return ret;
2102         }
2103
2104         /* go on with the call chain - do the modify after the rename */
2105         return ldb_next_request(ac->module, down_req);
2106 }
2107
2108 /*
2109    remove links from objects that point at this object when an object
2110    is deleted
2111  */
2112 static int replmd_delete_remove_link(struct ldb_module *module,
2113                                      struct dsdb_schema *schema,
2114                                      struct ldb_dn *dn,
2115                                      struct ldb_message_element *el,
2116                                      const struct dsdb_attribute *sa)
2117 {
2118         int i;
2119         TALLOC_CTX *tmp_ctx = talloc_new(module);
2120         struct ldb_context *ldb = ldb_module_get_ctx(module);
2121
2122         for (i=0; i<el->num_values; i++) {
2123                 struct dsdb_dn *dsdb_dn;
2124                 NTSTATUS status;
2125                 int ret;
2126                 struct GUID guid2;
2127                 struct ldb_message *msg;
2128                 const struct dsdb_attribute *target_attr;
2129                 struct ldb_message_element *el2;
2130                 struct ldb_val dn_val;
2131
2132                 if (dsdb_dn_is_deleted_val(&el->values[i])) {
2133                         continue;
2134                 }
2135
2136                 dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &el->values[i], sa->syntax->ldap_oid);
2137                 if (!dsdb_dn) {
2138                         talloc_free(tmp_ctx);
2139                         return LDB_ERR_OPERATIONS_ERROR;
2140                 }
2141
2142                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid2, "GUID");
2143                 if (!NT_STATUS_IS_OK(status)) {
2144                         talloc_free(tmp_ctx);
2145                         return LDB_ERR_OPERATIONS_ERROR;
2146                 }
2147
2148                 /* remove the link */
2149                 msg = ldb_msg_new(tmp_ctx);
2150                 if (!msg) {
2151                         ldb_module_oom(module);
2152                         talloc_free(tmp_ctx);
2153                         return LDB_ERR_OPERATIONS_ERROR;
2154                 }
2155
2156
2157                 msg->dn = dsdb_dn->dn;
2158
2159                 target_attr = dsdb_attribute_by_linkID(schema, sa->linkID ^ 1);
2160                 if (target_attr == NULL) {
2161                         continue;
2162                 }
2163
2164                 ret = ldb_msg_add_empty(msg, target_attr->lDAPDisplayName, LDB_FLAG_MOD_DELETE, &el2);
2165                 if (ret != LDB_SUCCESS) {
2166                         ldb_module_oom(module);
2167                         talloc_free(tmp_ctx);
2168                         return LDB_ERR_OPERATIONS_ERROR;
2169                 }
2170                 dn_val = data_blob_string_const(ldb_dn_get_linearized(dn));
2171                 el2->values = &dn_val;
2172                 el2->num_values = 1;
2173
2174                 ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE);
2175                 if (ret != LDB_SUCCESS) {
2176                         talloc_free(tmp_ctx);
2177                         return ret;
2178                 }
2179         }
2180         talloc_free(tmp_ctx);
2181         return LDB_SUCCESS;
2182 }
2183
2184
2185 /*
2186   handle update of replication meta data for deletion of objects
2187
2188   This also handles the mapping of delete to a rename operation
2189   to allow deletes to be replicated.
2190  */
2191 static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
2192 {
2193         int ret = LDB_ERR_OTHER;
2194         bool retb;
2195         struct ldb_dn *old_dn, *new_dn;
2196         const char *rdn_name;
2197         const struct ldb_val *rdn_value, *new_rdn_value;
2198         struct GUID guid;
2199         struct ldb_context *ldb = ldb_module_get_ctx(module);
2200         struct dsdb_schema *schema = dsdb_get_schema(ldb);
2201         struct ldb_message *msg, *old_msg;
2202         struct ldb_message_element *el;
2203         TALLOC_CTX *tmp_ctx;
2204         struct ldb_result *res, *parent_res;
2205         const char *preserved_attrs[] = {
2206                 /* yes, this really is a hard coded list. See MS-ADTS
2207                    section 3.1.1.5.5.1.1 */
2208                 "nTSecurityDescriptor", "attributeID", "attributeSyntax", "dNReferenceUpdate", "dNSHostName",
2209                 "flatName", "governsID", "groupType", "instanceType", "lDAPDisplayName", "legacyExchangeDN",
2210                 "isDeleted", "isRecycled", "lastKnownParent", "msDS-LastKnownRDN", "mS-DS-CreatorSID",
2211                 "mSMQOwnerID", "nCName", "objectClass", "distinguishedName", "objectGUID", "objectSid",
2212                 "oMSyntax", "proxiedObjectName", "name", "replPropertyMetaData", "sAMAccountName",
2213                 "securityIdentifier", "sIDHistory", "subClassOf", "systemFlags", "trustPartner", "trustDirection",
2214                 "trustType", "trustAttributes", "userAccountControl", "uSNChanged", "uSNCreated", "whenCreated",
2215                 "whenChanged", NULL};
2216         uint32_t el_count = 0;
2217         int i;
2218
2219         if (ldb_dn_is_special(req->op.del.dn)) {
2220                 return ldb_next_request(module, req);
2221         }
2222
2223         tmp_ctx = talloc_new(ldb);
2224
2225         old_dn = ldb_dn_copy(tmp_ctx, req->op.del.dn);
2226
2227         /* we need the complete msg off disk, so we can work out which
2228            attributes need to be removed */
2229         ret = dsdb_module_search_dn(module, tmp_ctx, &res, old_dn, NULL,
2230                                     DSDB_SEARCH_SHOW_DELETED |
2231                                     DSDB_SEARCH_REVEAL_INTERNALS |
2232                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
2233         if (ret != LDB_SUCCESS) {
2234                 talloc_free(tmp_ctx);
2235                 return ret;
2236         }
2237         old_msg = res->msgs[0];
2238
2239         if (ldb_msg_check_string_attribute(old_msg, "isDeleted", "TRUE")) {
2240                 struct auth_session_info *session_info =
2241                         (struct auth_session_info *)ldb_get_opaque(ldb, "sessionInfo");
2242                 if (security_session_user_level(session_info) != SECURITY_SYSTEM) {
2243                         ldb_asprintf_errstring(ldb, "Refusing to delete deleted object %s",
2244                                                ldb_dn_get_linearized(old_msg->dn));
2245                         return LDB_ERR_UNWILLING_TO_PERFORM;
2246                 }
2247
2248                 /* it is already deleted - really remove it this time */
2249                 talloc_free(tmp_ctx);
2250                 return ldb_next_request(module, req);
2251         }
2252
2253         /* work out where we will be renaming this object to */
2254         ret = dsdb_get_deleted_objects_dn(ldb, tmp_ctx, old_dn, &new_dn);
2255         if (ret != LDB_SUCCESS) {
2256                 /* this is probably an attempted delete on a partition
2257                  * that doesn't allow delete operations, such as the
2258                  * schema partition */
2259                 ldb_asprintf_errstring(ldb, "No Deleted Objects container for DN %s",
2260                                        ldb_dn_get_linearized(old_dn));
2261                 talloc_free(tmp_ctx);
2262                 return LDB_ERR_UNWILLING_TO_PERFORM;
2263         }
2264
2265         rdn_name = ldb_dn_get_rdn_name(old_dn);
2266         rdn_value = ldb_dn_get_rdn_val(old_dn);
2267
2268         /* get the objects GUID from the search we just did */
2269         guid = samdb_result_guid(old_msg, "objectGUID");
2270
2271         /* Add a formatted child */
2272         retb = ldb_dn_add_child_fmt(new_dn, "%s=%s\\0ADEL:%s",
2273                                     rdn_name,
2274                                     rdn_value->data,
2275                                     GUID_string(tmp_ctx, &guid));
2276         if (!retb) {
2277                 DEBUG(0,(__location__ ": Unable to add a formatted child to dn: %s",
2278                                 ldb_dn_get_linearized(new_dn)));
2279                 talloc_free(tmp_ctx);
2280                 return LDB_ERR_OPERATIONS_ERROR;
2281         }
2282
2283         /*
2284           now we need to modify the object in the following ways:
2285
2286           - add isDeleted=TRUE
2287           - update rDN and name, with new rDN
2288           - remove linked attributes
2289           - remove objectCategory and sAMAccountType
2290           - remove attribs not on the preserved list
2291              - preserved if in above list, or is rDN
2292           - remove all linked attribs from this object
2293           - remove all links from other objects to this object
2294           - add lastKnownParent
2295           - update replPropertyMetaData?
2296
2297           see MS-ADTS "Tombstone Requirements" section 3.1.1.5.5.1.1
2298          */
2299
2300         msg = ldb_msg_new(tmp_ctx);
2301         if (msg == NULL) {
2302                 ldb_module_oom(module);
2303                 talloc_free(tmp_ctx);
2304                 return LDB_ERR_OPERATIONS_ERROR;
2305         }
2306
2307         msg->dn = old_dn;
2308
2309         ret = ldb_msg_add_string(msg, "isDeleted", "TRUE");
2310         if (ret != LDB_SUCCESS) {
2311                 DEBUG(0,(__location__ ": Failed to add isDeleted string to the msg\n"));
2312                 ldb_module_oom(module);
2313                 talloc_free(tmp_ctx);
2314                 return ret;
2315         }
2316         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2317
2318         /* we also mark it as recycled, meaning this object can't be
2319            recovered (we are stripping its attributes) */
2320         if (dsdb_functional_level(ldb) >= DS_DOMAIN_FUNCTION_2008_R2) {
2321                 ret = ldb_msg_add_string(msg, "isRecycled", "TRUE");
2322                 if (ret != LDB_SUCCESS) {
2323                         DEBUG(0,(__location__ ": Failed to add isRecycled string to the msg\n"));
2324                         ldb_module_oom(module);
2325                         talloc_free(tmp_ctx);
2326                         return ret;
2327                 }
2328                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2329         }
2330
2331         /* we need the storage form of the parent GUID */
2332         ret = dsdb_module_search_dn(module, tmp_ctx, &parent_res,
2333                                     ldb_dn_get_parent(tmp_ctx, old_dn), NULL,
2334                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
2335                                     DSDB_SEARCH_REVEAL_INTERNALS);
2336         if (ret != LDB_SUCCESS) {
2337                 talloc_free(tmp_ctx);
2338                 return ret;
2339         }
2340
2341         ret = ldb_msg_add_steal_string(msg, "lastKnownParent",
2342                                        ldb_dn_get_extended_linearized(tmp_ctx, parent_res->msgs[0]->dn, 1));
2343         if (ret != LDB_SUCCESS) {
2344                 DEBUG(0,(__location__ ": Failed to add lastKnownParent string to the msg\n"));
2345                 ldb_module_oom(module);
2346                 talloc_free(tmp_ctx);
2347                 return ret;
2348         }
2349         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2350
2351         /* work out which of the old attributes we will be removing */
2352         for (i=0; i<old_msg->num_elements; i++) {
2353                 const struct dsdb_attribute *sa;
2354                 el = &old_msg->elements[i];
2355                 sa = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
2356                 if (!sa) {
2357                         talloc_free(tmp_ctx);
2358                         return LDB_ERR_OPERATIONS_ERROR;
2359                 }
2360                 if (ldb_attr_cmp(el->name, rdn_name) == 0) {
2361                         /* don't remove the rDN */
2362                         continue;
2363                 }
2364
2365                 if (sa->linkID && sa->linkID & 1) {
2366                         ret = replmd_delete_remove_link(module, schema, old_dn, el, sa);
2367                         if (ret != LDB_SUCCESS) {
2368                                 talloc_free(tmp_ctx);
2369                                 return LDB_ERR_OPERATIONS_ERROR;
2370                         }
2371                         continue;
2372                 }
2373
2374                 if (!sa->linkID && ldb_attr_in_list(preserved_attrs, el->name)) {
2375                         continue;
2376                 }
2377
2378                 ret = ldb_msg_add_empty(msg, el->name, LDB_FLAG_MOD_DELETE, &el);
2379                 if (ret != LDB_SUCCESS) {
2380                         talloc_free(tmp_ctx);
2381                         ldb_module_oom(module);
2382                         return ret;
2383                 }
2384         }
2385
2386         /* work out what the new rdn value is, for updating the
2387            rDN and name fields */
2388         new_rdn_value = ldb_dn_get_rdn_val(new_dn);
2389         ret = ldb_msg_add_value(msg, rdn_name, new_rdn_value, &el);
2390         if (ret != LDB_SUCCESS) {
2391                 talloc_free(tmp_ctx);
2392                 return ret;
2393         }
2394         el->flags = LDB_FLAG_MOD_REPLACE;
2395
2396         el = ldb_msg_find_element(old_msg, "name");
2397         if (el) {
2398                 ret = ldb_msg_add_value(msg, "name", new_rdn_value, &el);
2399                 if (ret != LDB_SUCCESS) {
2400                         talloc_free(tmp_ctx);
2401                         return ret;
2402                 }
2403                 el->flags = LDB_FLAG_MOD_REPLACE;
2404         }
2405
2406         ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE);
2407         if (ret != LDB_SUCCESS) {
2408                 ldb_asprintf_errstring(ldb, "replmd_delete: Failed to modify object %s in delete - %s",
2409                                        ldb_dn_get_linearized(old_dn), ldb_errstring(ldb));
2410                 talloc_free(tmp_ctx);
2411                 return ret;
2412         }
2413
2414         /* now rename onto the new DN */
2415         ret = dsdb_module_rename(module, old_dn, new_dn, 0);
2416         if (ret != LDB_SUCCESS){
2417                 DEBUG(0,(__location__ ": Failed to rename object from '%s' to '%s' - %s\n",
2418                          ldb_dn_get_linearized(old_dn),
2419                          ldb_dn_get_linearized(new_dn),
2420                          ldb_errstring(ldb)));
2421                 talloc_free(tmp_ctx);
2422                 return ret;
2423         }
2424
2425         talloc_free(tmp_ctx);
2426
2427         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
2428 }
2429
2430
2431
2432 static int replmd_replicated_request_error(struct replmd_replicated_request *ar, int ret)
2433 {
2434         return ret;
2435 }
2436
2437 static int replmd_replicated_request_werror(struct replmd_replicated_request *ar, WERROR status)
2438 {
2439         int ret = LDB_ERR_OTHER;
2440         /* TODO: do some error mapping */
2441         return ret;
2442 }
2443
2444 static int replmd_replicated_apply_add(struct replmd_replicated_request *ar)
2445 {
2446         struct ldb_context *ldb;
2447         struct ldb_request *change_req;
2448         enum ndr_err_code ndr_err;
2449         struct ldb_message *msg;
2450         struct replPropertyMetaDataBlob *md;
2451         struct ldb_val md_value;
2452         uint32_t i;
2453         int ret;
2454
2455         /*
2456          * TODO: check if the parent object exist
2457          */
2458
2459         /*
2460          * TODO: handle the conflict case where an object with the
2461          *       same name exist
2462          */
2463
2464         ldb = ldb_module_get_ctx(ar->module);
2465         msg = ar->objs->objects[ar->index_current].msg;
2466         md = ar->objs->objects[ar->index_current].meta_data;
2467
2468         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2469         if (ret != LDB_SUCCESS) {
2470                 return replmd_replicated_request_error(ar, ret);
2471         }
2472
2473         ret = ldb_msg_add_value(msg, "objectGUID", &ar->objs->objects[ar->index_current].guid_value, NULL);
2474         if (ret != LDB_SUCCESS) {
2475                 return replmd_replicated_request_error(ar, ret);
2476         }
2477
2478         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2479         if (ret != LDB_SUCCESS) {
2480                 return replmd_replicated_request_error(ar, ret);
2481         }
2482
2483         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ar->seq_num);
2484         if (ret != LDB_SUCCESS) {
2485                 return replmd_replicated_request_error(ar, ret);
2486         }
2487
2488         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2489         if (ret != LDB_SUCCESS) {
2490                 return replmd_replicated_request_error(ar, ret);
2491         }
2492
2493         /* remove any message elements that have zero values */
2494         for (i=0; i<msg->num_elements; i++) {
2495                 struct ldb_message_element *el = &msg->elements[i];
2496
2497                 if (el->num_values == 0) {
2498                         DEBUG(4,(__location__ ": Removing attribute %s with num_values==0\n",
2499                                  el->name));
2500                         memmove(el, el+1, sizeof(*el)*(msg->num_elements - (i+1)));
2501                         msg->num_elements--;
2502                         i--;
2503                         continue;
2504                 }
2505         }
2506
2507         /*
2508          * the meta data array is already sorted by the caller
2509          */
2510         for (i=0; i < md->ctr.ctr1.count; i++) {
2511                 md->ctr.ctr1.array[i].local_usn = ar->seq_num;
2512         }
2513         ndr_err = ndr_push_struct_blob(&md_value, msg,
2514                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
2515                                        md,
2516                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2517         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2518                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2519                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2520         }
2521         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &md_value, NULL);
2522         if (ret != LDB_SUCCESS) {
2523                 return replmd_replicated_request_error(ar, ret);
2524         }
2525
2526         replmd_ldb_message_sort(msg, ar->schema);
2527
2528         if (DEBUGLVL(4)) {
2529                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_ADD, msg);
2530                 DEBUG(4, ("DRS replication add message:\n%s\n", s));
2531                 talloc_free(s);
2532         }
2533
2534         ret = ldb_build_add_req(&change_req,
2535                                 ldb,
2536                                 ar,
2537                                 msg,
2538                                 ar->controls,
2539                                 ar,
2540                                 replmd_op_callback,
2541                                 ar->req);
2542         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2543
2544         return ldb_next_request(ar->module, change_req);
2545 }
2546
2547 /*
2548    return true if an update is newer than an existing entry
2549    see section 5.11 of MS-ADTS
2550 */
2551 static bool replmd_update_is_newer(const struct GUID *current_invocation_id,
2552                                    const struct GUID *update_invocation_id,
2553                                    uint32_t current_version,
2554                                    uint32_t update_version,
2555                                    NTTIME current_change_time,
2556                                    NTTIME update_change_time)
2557 {
2558         if (update_version != current_version) {
2559                 return update_version > current_version;
2560         }
2561         if (update_change_time > current_change_time) {
2562                 return true;
2563         }
2564         if (update_change_time == current_change_time) {
2565                 return GUID_compare(update_invocation_id, current_invocation_id) > 0;
2566         }
2567         return false;
2568 }
2569
2570 static bool replmd_replPropertyMetaData1_is_newer(struct replPropertyMetaData1 *cur_m,
2571                                                   struct replPropertyMetaData1 *new_m)
2572 {
2573         return replmd_update_is_newer(&cur_m->originating_invocation_id,
2574                                       &new_m->originating_invocation_id,
2575                                       cur_m->version,
2576                                       new_m->version,
2577                                       cur_m->originating_change_time,
2578                                       new_m->originating_change_time);
2579 }
2580
2581 static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
2582 {
2583         struct ldb_context *ldb;
2584         struct ldb_request *change_req;
2585         enum ndr_err_code ndr_err;
2586         struct ldb_message *msg;
2587         struct replPropertyMetaDataBlob *rmd;
2588         struct replPropertyMetaDataBlob omd;
2589         const struct ldb_val *omd_value;
2590         struct replPropertyMetaDataBlob nmd;
2591         struct ldb_val nmd_value;
2592         uint32_t i,j,ni=0;
2593         uint32_t removed_attrs = 0;
2594         int ret;
2595
2596         ldb = ldb_module_get_ctx(ar->module);
2597         msg = ar->objs->objects[ar->index_current].msg;
2598         rmd = ar->objs->objects[ar->index_current].meta_data;
2599         ZERO_STRUCT(omd);
2600         omd.version = 1;
2601
2602         /*
2603          * TODO: check repl data is correct after a rename
2604          */
2605         if (ldb_dn_compare(msg->dn, ar->search_msg->dn) != 0) {
2606                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_request rename %s => %s\n",
2607                           ldb_dn_get_linearized(ar->search_msg->dn),
2608                           ldb_dn_get_linearized(msg->dn));
2609                 if (dsdb_module_rename(ar->module,
2610                                        ar->search_msg->dn, msg->dn,
2611                                        DSDB_FLAG_OWN_MODULE) != LDB_SUCCESS) {
2612                         ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_replicated_request rename %s => %s failed - %s\n",
2613                                   ldb_dn_get_linearized(ar->search_msg->dn),
2614                                   ldb_dn_get_linearized(msg->dn),
2615                                   ldb_errstring(ldb));
2616                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_DB_ERROR);
2617                 }
2618         }
2619
2620         /* find existing meta data */
2621         omd_value = ldb_msg_find_ldb_val(ar->search_msg, "replPropertyMetaData");
2622         if (omd_value) {
2623                 ndr_err = ndr_pull_struct_blob(omd_value, ar,
2624                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &omd,
2625                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
2626                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2627                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2628                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2629                 }
2630
2631                 if (omd.version != 1) {
2632                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
2633                 }
2634         }
2635
2636         ZERO_STRUCT(nmd);
2637         nmd.version = 1;
2638         nmd.ctr.ctr1.count = omd.ctr.ctr1.count + rmd->ctr.ctr1.count;
2639         nmd.ctr.ctr1.array = talloc_array(ar,
2640                                           struct replPropertyMetaData1,
2641                                           nmd.ctr.ctr1.count);
2642         if (!nmd.ctr.ctr1.array) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2643
2644         /* first copy the old meta data */
2645         for (i=0; i < omd.ctr.ctr1.count; i++) {
2646                 nmd.ctr.ctr1.array[ni]  = omd.ctr.ctr1.array[i];
2647                 ni++;
2648         }
2649
2650         /* now merge in the new meta data */
2651         for (i=0; i < rmd->ctr.ctr1.count; i++) {
2652                 bool found = false;
2653
2654                 for (j=0; j < ni; j++) {
2655                         bool cmp;
2656
2657                         if (rmd->ctr.ctr1.array[i].attid != nmd.ctr.ctr1.array[j].attid) {
2658                                 continue;
2659                         }
2660
2661                         cmp = replmd_replPropertyMetaData1_is_newer(&nmd.ctr.ctr1.array[j],
2662                                                                     &rmd->ctr.ctr1.array[i]);
2663                         if (cmp) {
2664                                 /* replace the entry */
2665                                 nmd.ctr.ctr1.array[j] = rmd->ctr.ctr1.array[i];
2666                                 found = true;
2667                                 break;
2668                         }
2669
2670                         if (rmd->ctr.ctr1.array[i].attid != DRSUAPI_ATTRIBUTE_instanceType) {
2671                                 DEBUG(1,("Discarding older DRS attribute update to %s on %s from %s\n",
2672                                          msg->elements[i-removed_attrs].name,
2673                                          ldb_dn_get_linearized(msg->dn),
2674                                          GUID_string(ar, &rmd->ctr.ctr1.array[i].originating_invocation_id)));
2675                         }
2676
2677                         /* we don't want to apply this change so remove the attribute */
2678                         ldb_msg_remove_element(msg, &msg->elements[i-removed_attrs]);
2679                         removed_attrs++;
2680
2681                         found = true;
2682                         break;
2683                 }
2684
2685                 if (found) continue;
2686
2687                 nmd.ctr.ctr1.array[ni] = rmd->ctr.ctr1.array[i];
2688                 ni++;
2689         }
2690
2691         /*
2692          * finally correct the size of the meta_data array
2693          */
2694         nmd.ctr.ctr1.count = ni;
2695
2696         /*
2697          * the rdn attribute (the alias for the name attribute),
2698          * 'cn' for most objects is the last entry in the meta data array
2699          * we have stored
2700          *
2701          * sort the new meta data array
2702          */
2703         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ar->schema, msg->dn);
2704         if (ret != LDB_SUCCESS) {
2705                 return ret;
2706         }
2707
2708         /*
2709          * check if some replicated attributes left, otherwise skip the ldb_modify() call
2710          */
2711         if (msg->num_elements == 0) {
2712                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: skip replace\n",
2713                           ar->index_current);
2714
2715                 ar->index_current++;
2716                 return replmd_replicated_apply_next(ar);
2717         }
2718
2719         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: replace %u attributes\n",
2720                   ar->index_current, msg->num_elements);
2721
2722         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2723         if (ret != LDB_SUCCESS) {
2724                 return replmd_replicated_request_error(ar, ret);
2725         }
2726
2727         for (i=0; i<ni; i++) {
2728                 nmd.ctr.ctr1.array[i].local_usn = ar->seq_num;
2729         }
2730
2731         /* create the meta data value */
2732         ndr_err = ndr_push_struct_blob(&nmd_value, msg,
2733                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
2734                                        &nmd,
2735                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2736         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2737                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2738                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2739         }
2740
2741         /*
2742          * when we know that we'll modify the record, add the whenChanged, uSNChanged
2743          * and replPopertyMetaData attributes
2744          */
2745         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2746         if (ret != LDB_SUCCESS) {
2747                 return replmd_replicated_request_error(ar, ret);
2748         }
2749         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2750         if (ret != LDB_SUCCESS) {
2751                 return replmd_replicated_request_error(ar, ret);
2752         }
2753         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
2754         if (ret != LDB_SUCCESS) {
2755                 return replmd_replicated_request_error(ar, ret);
2756         }
2757
2758         replmd_ldb_message_sort(msg, ar->schema);
2759
2760         /* we want to replace the old values */
2761         for (i=0; i < msg->num_elements; i++) {
2762                 msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
2763         }
2764
2765         if (DEBUGLVL(4)) {
2766                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
2767                 DEBUG(4, ("DRS replication modify message:\n%s\n", s));
2768                 talloc_free(s);
2769         }
2770
2771         ret = ldb_build_mod_req(&change_req,
2772                                 ldb,
2773                                 ar,
2774                                 msg,
2775                                 ar->controls,
2776                                 ar,
2777                                 replmd_op_callback,
2778                                 ar->req);
2779         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2780
2781         return ldb_next_request(ar->module, change_req);
2782 }
2783
2784 static int replmd_replicated_apply_search_callback(struct ldb_request *req,
2785                                                    struct ldb_reply *ares)
2786 {
2787         struct replmd_replicated_request *ar = talloc_get_type(req->context,
2788                                                struct replmd_replicated_request);
2789         int ret;
2790
2791         if (!ares) {
2792                 return ldb_module_done(ar->req, NULL, NULL,
2793                                         LDB_ERR_OPERATIONS_ERROR);
2794         }
2795         if (ares->error != LDB_SUCCESS &&
2796             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
2797                 return ldb_module_done(ar->req, ares->controls,
2798                                         ares->response, ares->error);
2799         }
2800
2801         switch (ares->type) {
2802         case LDB_REPLY_ENTRY:
2803                 ar->search_msg = talloc_steal(ar, ares->message);
2804                 break;
2805
2806         case LDB_REPLY_REFERRAL:
2807                 /* we ignore referrals */
2808                 break;
2809
2810         case LDB_REPLY_DONE:
2811                 if (ar->search_msg != NULL) {
2812                         ret = replmd_replicated_apply_merge(ar);
2813                 } else {
2814                         ret = replmd_replicated_apply_add(ar);
2815                 }
2816                 if (ret != LDB_SUCCESS) {
2817                         return ldb_module_done(ar->req, NULL, NULL, ret);
2818                 }
2819         }
2820
2821         talloc_free(ares);
2822         return LDB_SUCCESS;
2823 }
2824
2825 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar);
2826
2827 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar)
2828 {
2829         struct ldb_context *ldb;
2830         int ret;
2831         char *tmp_str;
2832         char *filter;
2833         struct ldb_request *search_req;
2834         struct ldb_search_options_control *options;
2835
2836         if (ar->index_current >= ar->objs->num_objects) {
2837                 /* done with it, go to next stage */
2838                 return replmd_replicated_uptodate_vector(ar);
2839         }
2840
2841         ldb = ldb_module_get_ctx(ar->module);
2842         ar->search_msg = NULL;
2843
2844         tmp_str = ldb_binary_encode(ar, ar->objs->objects[ar->index_current].guid_value);
2845         if (!tmp_str) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2846
2847         filter = talloc_asprintf(ar, "(objectGUID=%s)", tmp_str);
2848         if (!filter) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2849         talloc_free(tmp_str);
2850
2851         ret = ldb_build_search_req(&search_req,
2852                                    ldb,
2853                                    ar,
2854                                    NULL,
2855                                    LDB_SCOPE_SUBTREE,
2856                                    filter,
2857                                    NULL,
2858                                    NULL,
2859                                    ar,
2860                                    replmd_replicated_apply_search_callback,
2861                                    ar->req);
2862
2863         ret = ldb_request_add_control(search_req, LDB_CONTROL_SHOW_DELETED_OID, true, NULL);
2864         if (ret != LDB_SUCCESS) {
2865                 return ret;
2866         }
2867
2868         /* we need to cope with cross-partition links, so search for
2869            the GUID over all partitions */
2870         options = talloc(search_req, struct ldb_search_options_control);
2871         if (options == NULL) {
2872                 DEBUG(0, (__location__ ": out of memory\n"));
2873                 return LDB_ERR_OPERATIONS_ERROR;
2874         }
2875         options->search_options = LDB_SEARCH_OPTION_PHANTOM_ROOT;
2876
2877         ret = ldb_request_add_control(search_req,
2878                                       LDB_CONTROL_SEARCH_OPTIONS_OID,
2879                                       true, options);
2880         if (ret != LDB_SUCCESS) {
2881                 return ret;
2882         }
2883
2884         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2885
2886         return ldb_next_request(ar->module, search_req);
2887 }
2888
2889 static int replmd_replicated_uptodate_modify_callback(struct ldb_request *req,
2890                                                       struct ldb_reply *ares)
2891 {
2892         struct ldb_context *ldb;
2893         struct replmd_replicated_request *ar = talloc_get_type(req->context,
2894                                                struct replmd_replicated_request);
2895         ldb = ldb_module_get_ctx(ar->module);
2896
2897         if (!ares) {
2898                 return ldb_module_done(ar->req, NULL, NULL,
2899                                         LDB_ERR_OPERATIONS_ERROR);
2900         }
2901         if (ares->error != LDB_SUCCESS) {
2902                 return ldb_module_done(ar->req, ares->controls,
2903                                         ares->response, ares->error);
2904         }
2905
2906         if (ares->type != LDB_REPLY_DONE) {
2907                 ldb_set_errstring(ldb, "Invalid reply type\n!");
2908                 return ldb_module_done(ar->req, NULL, NULL,
2909                                         LDB_ERR_OPERATIONS_ERROR);
2910         }
2911
2912         talloc_free(ares);
2913
2914         return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
2915 }
2916
2917 static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *ar)
2918 {
2919         struct ldb_context *ldb;
2920         struct ldb_request *change_req;
2921         enum ndr_err_code ndr_err;
2922         struct ldb_message *msg;
2923         struct replUpToDateVectorBlob ouv;
2924         const struct ldb_val *ouv_value;
2925         const struct drsuapi_DsReplicaCursor2CtrEx *ruv;
2926         struct replUpToDateVectorBlob nuv;
2927         struct ldb_val nuv_value;
2928         struct ldb_message_element *nuv_el = NULL;
2929         const struct GUID *our_invocation_id;
2930         struct ldb_message_element *orf_el = NULL;
2931         struct repsFromToBlob nrf;
2932         struct ldb_val *nrf_value = NULL;
2933         struct ldb_message_element *nrf_el = NULL;
2934         uint32_t i,j,ni=0;
2935         bool found = false;
2936         time_t t = time(NULL);
2937         NTTIME now;
2938         int ret;
2939
2940         ldb = ldb_module_get_ctx(ar->module);
2941         ruv = ar->objs->uptodateness_vector;
2942         ZERO_STRUCT(ouv);
2943         ouv.version = 2;
2944         ZERO_STRUCT(nuv);
2945         nuv.version = 2;
2946
2947         unix_to_nt_time(&now, t);
2948
2949         /*
2950          * first create the new replUpToDateVector
2951          */
2952         ouv_value = ldb_msg_find_ldb_val(ar->search_msg, "replUpToDateVector");
2953         if (ouv_value) {
2954                 ndr_err = ndr_pull_struct_blob(ouv_value, ar,
2955                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &ouv,
2956                                                (ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob);
2957                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2958                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2959                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2960                 }
2961
2962                 if (ouv.version != 2) {
2963                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
2964                 }
2965         }
2966
2967         /*
2968          * the new uptodateness vector will at least
2969          * contain 1 entry, one for the source_dsa
2970          *
2971          * plus optional values from our old vector and the one from the source_dsa
2972          */
2973         nuv.ctr.ctr2.count = 1 + ouv.ctr.ctr2.count;
2974         if (ruv) nuv.ctr.ctr2.count += ruv->count;
2975         nuv.ctr.ctr2.cursors = talloc_array(ar,
2976                                             struct drsuapi_DsReplicaCursor2,
2977                                             nuv.ctr.ctr2.count);
2978         if (!nuv.ctr.ctr2.cursors) return replmd_replicated_request_werror(ar, WERR_NOMEM);
2979
2980         /* first copy the old vector */
2981         for (i=0; i < ouv.ctr.ctr2.count; i++) {
2982                 nuv.ctr.ctr2.cursors[ni] = ouv.ctr.ctr2.cursors[i];
2983                 ni++;
2984         }
2985
2986         /* get our invocation_id if we have one already attached to the ldb */
2987         our_invocation_id = samdb_ntds_invocation_id(ldb);
2988
2989         /* merge in the source_dsa vector is available */
2990         for (i=0; (ruv && i < ruv->count); i++) {
2991                 found = false;
2992
2993                 if (our_invocation_id &&
2994                     GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
2995                                our_invocation_id)) {
2996                         continue;
2997                 }
2998
2999                 for (j=0; j < ni; j++) {
3000                         if (!GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
3001                                         &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
3002                                 continue;
3003                         }
3004
3005                         found = true;
3006
3007                         /*
3008                          * we update only the highest_usn and not the latest_sync_success time,
3009                          * because the last success stands for direct replication
3010                          */
3011                         if (ruv->cursors[i].highest_usn > nuv.ctr.ctr2.cursors[j].highest_usn) {
3012                                 nuv.ctr.ctr2.cursors[j].highest_usn = ruv->cursors[i].highest_usn;
3013                         }
3014                         break;
3015                 }
3016
3017                 if (found) continue;
3018
3019                 /* if it's not there yet, add it */
3020                 nuv.ctr.ctr2.cursors[ni] = ruv->cursors[i];
3021                 ni++;
3022         }
3023
3024         /*
3025          * merge in the current highwatermark for the source_dsa
3026          */
3027         found = false;
3028         for (j=0; j < ni; j++) {
3029                 if (!GUID_equal(&ar->objs->source_dsa->source_dsa_invocation_id,
3030                                 &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
3031                         continue;
3032                 }
3033
3034                 found = true;
3035
3036                 /*
3037                  * here we update the highest_usn and last_sync_success time
3038                  * because we're directly replicating from the source_dsa
3039                  *
3040                  * and use the tmp_highest_usn because this is what we have just applied
3041                  * to our ldb
3042                  */
3043                 nuv.ctr.ctr2.cursors[j].highest_usn             = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
3044                 nuv.ctr.ctr2.cursors[j].last_sync_success       = now;
3045                 break;
3046         }
3047         if (!found) {
3048                 /*
3049                  * here we update the highest_usn and last_sync_success time
3050                  * because we're directly replicating from the source_dsa
3051                  *
3052                  * and use the tmp_highest_usn because this is what we have just applied
3053                  * to our ldb
3054                  */
3055                 nuv.ctr.ctr2.cursors[ni].source_dsa_invocation_id= ar->objs->source_dsa->source_dsa_invocation_id;
3056                 nuv.ctr.ctr2.cursors[ni].highest_usn            = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
3057                 nuv.ctr.ctr2.cursors[ni].last_sync_success      = now;
3058                 ni++;
3059         }
3060
3061         /*
3062          * finally correct the size of the cursors array
3063          */
3064         nuv.ctr.ctr2.count = ni;
3065
3066         /*
3067          * sort the cursors
3068          */
3069         qsort(nuv.ctr.ctr2.cursors, nuv.ctr.ctr2.count,
3070               sizeof(struct drsuapi_DsReplicaCursor2),
3071               (comparison_fn_t)drsuapi_DsReplicaCursor2_compare);
3072
3073         /*
3074          * create the change ldb_message
3075          */
3076         msg = ldb_msg_new(ar);
3077         if (!msg) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3078         msg->dn = ar->search_msg->dn;
3079
3080         ndr_err = ndr_push_struct_blob(&nuv_value, msg,
3081                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
3082                                        &nuv,
3083                                        (ndr_push_flags_fn_t)ndr_push_replUpToDateVectorBlob);
3084         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3085                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3086                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3087         }
3088         ret = ldb_msg_add_value(msg, "replUpToDateVector", &nuv_value, &nuv_el);
3089         if (ret != LDB_SUCCESS) {
3090                 return replmd_replicated_request_error(ar, ret);
3091         }
3092         nuv_el->flags = LDB_FLAG_MOD_REPLACE;
3093
3094         /*
3095          * now create the new repsFrom value from the given repsFromTo1 structure
3096          */
3097         ZERO_STRUCT(nrf);
3098         nrf.version                                     = 1;
3099         nrf.ctr.ctr1                                    = *ar->objs->source_dsa;
3100         /* and fix some values... */
3101         nrf.ctr.ctr1.consecutive_sync_failures          = 0;
3102         nrf.ctr.ctr1.last_success                       = now;
3103         nrf.ctr.ctr1.last_attempt                       = now;
3104         nrf.ctr.ctr1.result_last_attempt                = WERR_OK;
3105         nrf.ctr.ctr1.highwatermark.highest_usn          = nrf.ctr.ctr1.highwatermark.tmp_highest_usn;
3106
3107         /*
3108          * first see if we already have a repsFrom value for the current source dsa
3109          * if so we'll later replace this value
3110          */
3111         orf_el = ldb_msg_find_element(ar->search_msg, "repsFrom");
3112         if (orf_el) {
3113                 for (i=0; i < orf_el->num_values; i++) {
3114                         struct repsFromToBlob *trf;
3115
3116                         trf = talloc(ar, struct repsFromToBlob);
3117                         if (!trf) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3118
3119                         ndr_err = ndr_pull_struct_blob(&orf_el->values[i], trf, lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), trf,
3120                                                        (ndr_pull_flags_fn_t)ndr_pull_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                         if (trf->version != 1) {
3127                                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3128                         }
3129
3130                         /*
3131                          * we compare the source dsa objectGUID not the invocation_id
3132                          * because we want only one repsFrom value per source dsa
3133                          * and when the invocation_id of the source dsa has changed we don't need
3134                          * the old repsFrom with the old invocation_id
3135                          */
3136                         if (!GUID_equal(&trf->ctr.ctr1.source_dsa_obj_guid,
3137                                         &ar->objs->source_dsa->source_dsa_obj_guid)) {
3138                                 talloc_free(trf);
3139                                 continue;
3140                         }
3141
3142                         talloc_free(trf);
3143                         nrf_value = &orf_el->values[i];
3144                         break;
3145                 }
3146
3147                 /*
3148                  * copy over all old values to the new ldb_message
3149                  */
3150                 ret = ldb_msg_add_empty(msg, "repsFrom", 0, &nrf_el);
3151                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3152                 *nrf_el = *orf_el;
3153         }
3154
3155         /*
3156          * if we haven't found an old repsFrom value for the current source dsa
3157          * we'll add a new value
3158          */
3159         if (!nrf_value) {
3160                 struct ldb_val zero_value;
3161                 ZERO_STRUCT(zero_value);
3162                 ret = ldb_msg_add_value(msg, "repsFrom", &zero_value, &nrf_el);
3163                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3164
3165                 nrf_value = &nrf_el->values[nrf_el->num_values - 1];
3166         }
3167
3168         /* we now fill the value which is already attached to ldb_message */
3169         ndr_err = ndr_push_struct_blob(nrf_value, msg,
3170                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
3171                                        &nrf,
3172                                        (ndr_push_flags_fn_t)ndr_push_repsFromToBlob);
3173         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3174                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3175                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3176         }
3177
3178         /*
3179          * the ldb_message_element for the attribute, has all the old values and the new one
3180          * so we'll replace the whole attribute with all values
3181          */
3182         nrf_el->flags = LDB_FLAG_MOD_REPLACE;
3183
3184         if (DEBUGLVL(4)) {
3185                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
3186                 DEBUG(4, ("DRS replication uptodate modify message:\n%s\n", s));
3187                 talloc_free(s);
3188         }
3189
3190         /* prepare the ldb_modify() request */
3191         ret = ldb_build_mod_req(&change_req,
3192                                 ldb,
3193                                 ar,
3194                                 msg,
3195                                 ar->controls,
3196                                 ar,
3197                                 replmd_replicated_uptodate_modify_callback,
3198                                 ar->req);
3199         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3200
3201         return ldb_next_request(ar->module, change_req);
3202 }
3203
3204 static int replmd_replicated_uptodate_search_callback(struct ldb_request *req,
3205                                                       struct ldb_reply *ares)
3206 {
3207         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3208                                                struct replmd_replicated_request);
3209         int ret;
3210
3211         if (!ares) {
3212                 return ldb_module_done(ar->req, NULL, NULL,
3213                                         LDB_ERR_OPERATIONS_ERROR);
3214         }
3215         if (ares->error != LDB_SUCCESS &&
3216             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3217                 return ldb_module_done(ar->req, ares->controls,
3218                                         ares->response, ares->error);
3219         }
3220
3221         switch (ares->type) {
3222         case LDB_REPLY_ENTRY:
3223                 ar->search_msg = talloc_steal(ar, ares->message);
3224                 break;
3225
3226         case LDB_REPLY_REFERRAL:
3227                 /* we ignore referrals */
3228                 break;
3229
3230         case LDB_REPLY_DONE:
3231                 if (ar->search_msg == NULL) {
3232                         ret = replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3233                 } else {
3234                         ret = replmd_replicated_uptodate_modify(ar);
3235                 }
3236                 if (ret != LDB_SUCCESS) {
3237                         return ldb_module_done(ar->req, NULL, NULL, ret);
3238                 }
3239         }
3240
3241         talloc_free(ares);
3242         return LDB_SUCCESS;
3243 }
3244
3245
3246 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar)
3247 {
3248         struct ldb_context *ldb;
3249         int ret;
3250         static const char *attrs[] = {
3251                 "replUpToDateVector",
3252                 "repsFrom",
3253                 NULL
3254         };
3255         struct ldb_request *search_req;
3256
3257         ldb = ldb_module_get_ctx(ar->module);
3258         ar->search_msg = NULL;
3259
3260         ret = ldb_build_search_req(&search_req,
3261                                    ldb,
3262                                    ar,
3263                                    ar->objs->partition_dn,
3264                                    LDB_SCOPE_BASE,
3265                                    "(objectClass=*)",
3266                                    attrs,
3267                                    NULL,
3268                                    ar,
3269                                    replmd_replicated_uptodate_search_callback,
3270                                    ar->req);
3271         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3272
3273         return ldb_next_request(ar->module, search_req);
3274 }
3275
3276
3277
3278 static int replmd_extended_replicated_objects(struct ldb_module *module, struct ldb_request *req)
3279 {
3280         struct ldb_context *ldb;
3281         struct dsdb_extended_replicated_objects *objs;
3282         struct replmd_replicated_request *ar;
3283         struct ldb_control **ctrls;
3284         int ret, i;
3285         struct replmd_private *replmd_private =
3286                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3287
3288         ldb = ldb_module_get_ctx(module);
3289
3290         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_extended_replicated_objects\n");
3291
3292         objs = talloc_get_type(req->op.extended.data, struct dsdb_extended_replicated_objects);
3293         if (!objs) {
3294                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: invalid extended data\n");
3295                 return LDB_ERR_PROTOCOL_ERROR;
3296         }
3297
3298         if (objs->version != DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION) {
3299                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: extended data invalid version [%u != %u]\n",
3300                           objs->version, DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION);
3301                 return LDB_ERR_PROTOCOL_ERROR;
3302         }
3303
3304         ar = replmd_ctx_init(module, req);
3305         if (!ar)
3306                 return LDB_ERR_OPERATIONS_ERROR;
3307
3308         /* Set the flags to have the replmd_op_callback run over the full set of objects */
3309         ar->apply_mode = true;
3310         ar->objs = objs;
3311         ar->schema = dsdb_get_schema(ldb);
3312         if (!ar->schema) {
3313                 ldb_debug_set(ldb, LDB_DEBUG_FATAL, "replmd_ctx_init: no loaded schema found\n");
3314                 talloc_free(ar);
3315                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
3316                 return LDB_ERR_CONSTRAINT_VIOLATION;
3317         }
3318
3319         ctrls = req->controls;
3320
3321         if (req->controls) {
3322                 req->controls = talloc_memdup(ar, req->controls,
3323                                               talloc_get_size(req->controls));
3324                 if (!req->controls) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3325         }
3326
3327         ret = ldb_request_add_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID, false, NULL);
3328         if (ret != LDB_SUCCESS) {
3329                 return ret;
3330         }
3331
3332         ar->controls = req->controls;
3333         req->controls = ctrls;
3334
3335         DEBUG(4,("linked_attributes_count=%u\n", objs->linked_attributes_count));
3336
3337         /* save away the linked attributes for the end of the
3338            transaction */
3339         for (i=0; i<ar->objs->linked_attributes_count; i++) {
3340                 struct la_entry *la_entry;
3341
3342                 if (replmd_private->la_ctx == NULL) {
3343                         replmd_private->la_ctx = talloc_new(replmd_private);
3344                 }
3345                 la_entry = talloc(replmd_private->la_ctx, struct la_entry);
3346                 if (la_entry == NULL) {
3347                         ldb_oom(ldb);
3348                         return LDB_ERR_OPERATIONS_ERROR;
3349                 }
3350                 la_entry->la = talloc(la_entry, struct drsuapi_DsReplicaLinkedAttribute);
3351                 if (la_entry->la == NULL) {
3352                         talloc_free(la_entry);
3353                         ldb_oom(ldb);
3354                         return LDB_ERR_OPERATIONS_ERROR;
3355                 }
3356                 *la_entry->la = ar->objs->linked_attributes[i];
3357
3358                 /* we need to steal the non-scalars so they stay
3359                    around until the end of the transaction */
3360                 talloc_steal(la_entry->la, la_entry->la->identifier);
3361                 talloc_steal(la_entry->la, la_entry->la->value.blob);
3362
3363                 DLIST_ADD(replmd_private->la_list, la_entry);
3364         }
3365
3366         return replmd_replicated_apply_next(ar);
3367 }
3368
3369 /*
3370   process one linked attribute structure
3371  */
3372 static int replmd_process_linked_attribute(struct ldb_module *module,
3373                                            struct la_entry *la_entry)
3374 {
3375         struct drsuapi_DsReplicaLinkedAttribute *la = la_entry->la;
3376         struct ldb_context *ldb = ldb_module_get_ctx(module);
3377         struct dsdb_schema *schema = dsdb_get_schema(ldb);
3378         struct ldb_message *msg;
3379         TALLOC_CTX *tmp_ctx = talloc_new(la_entry);
3380         int ret;
3381         const struct dsdb_attribute *attr;
3382         struct dsdb_dn *dsdb_dn;
3383         uint64_t seq_num = 0;
3384         struct ldb_message_element *old_el;
3385         WERROR status;
3386         time_t t = time(NULL);
3387         struct ldb_result *res;
3388         const char *attrs[2];
3389         struct parsed_dn *pdn_list, *pdn;
3390         struct GUID guid = GUID_zero();
3391         NTSTATUS ntstatus;
3392         bool active = (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?true:false;
3393         const struct GUID *our_invocation_id;
3394
3395 /*
3396 linked_attributes[0]:
3397      &objs->linked_attributes[i]: struct drsuapi_DsReplicaLinkedAttribute
3398         identifier               : *
3399             identifier: struct drsuapi_DsReplicaObjectIdentifier
3400                 __ndr_size               : 0x0000003a (58)
3401                 __ndr_size_sid           : 0x00000000 (0)
3402                 guid                     : 8e95b6a9-13dd-4158-89db-3220a5be5cc7
3403                 sid                      : S-0-0
3404                 __ndr_size_dn            : 0x00000000 (0)
3405                 dn                       : ''
3406         attid                    : DRSUAPI_ATTRIBUTE_member (0x1F)
3407         value: struct drsuapi_DsAttributeValue
3408             __ndr_size               : 0x0000007e (126)
3409             blob                     : *
3410                 blob                     : DATA_BLOB length=126
3411         flags                    : 0x00000001 (1)
3412                1: DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE
3413         originating_add_time     : Wed Sep  2 22:20:01 2009 EST
3414         meta_data: struct drsuapi_DsReplicaMetaData
3415             version                  : 0x00000015 (21)
3416             originating_change_time  : Wed Sep  2 23:39:07 2009 EST
3417             originating_invocation_id: 794640f3-18cf-40ee-a211-a93992b67a64
3418             originating_usn          : 0x000000000001e19c (123292)
3419
3420 (for cases where the link is to a normal DN)
3421      &target: struct drsuapi_DsReplicaObjectIdentifier3
3422         __ndr_size               : 0x0000007e (126)
3423         __ndr_size_sid           : 0x0000001c (28)
3424         guid                     : 7639e594-db75-4086-b0d4-67890ae46031
3425         sid                      : S-1-5-21-2848215498-2472035911-1947525656-19924
3426         __ndr_size_dn            : 0x00000022 (34)
3427         dn                       : 'CN=UOne,OU=TestOU,DC=vsofs8,DC=com'
3428  */
3429
3430         /* find the attribute being modified */
3431         attr = dsdb_attribute_by_attributeID_id(schema, la->attid);
3432         if (attr == NULL) {
3433                 DEBUG(0, (__location__ ": Unable to find attributeID 0x%x\n", la->attid));
3434                 talloc_free(tmp_ctx);
3435                 return LDB_ERR_OPERATIONS_ERROR;
3436         }
3437
3438         attrs[0] = attr->lDAPDisplayName;
3439         attrs[1] = NULL;
3440
3441         /* get the existing message from the db for the object with
3442            this GUID, returning attribute being modified. We will then
3443            use this msg as the basis for a modify call */
3444         ret = dsdb_module_search(module, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE, attrs,
3445                                  DSDB_SEARCH_SEARCH_ALL_PARTITIONS |
3446                                  DSDB_SEARCH_SHOW_DELETED |
3447                                  DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
3448                                  DSDB_SEARCH_REVEAL_INTERNALS,
3449                                  "objectGUID=%s", GUID_string(tmp_ctx, &la->identifier->guid));
3450         if (ret != LDB_SUCCESS) {
3451                 talloc_free(tmp_ctx);
3452                 return ret;
3453         }
3454         if (res->count != 1) {
3455                 ldb_asprintf_errstring(ldb, "DRS linked attribute for GUID %s - DN not found",
3456                                        GUID_string(tmp_ctx, &la->identifier->guid));
3457                 talloc_free(tmp_ctx);
3458                 return LDB_ERR_NO_SUCH_OBJECT;
3459         }
3460         msg = res->msgs[0];
3461
3462         if (msg->num_elements == 0) {
3463                 ret = ldb_msg_add_empty(msg, attr->lDAPDisplayName, LDB_FLAG_MOD_REPLACE, &old_el);
3464                 if (ret != LDB_SUCCESS) {
3465                         ldb_module_oom(module);
3466                         talloc_free(tmp_ctx);
3467                         return LDB_ERR_OPERATIONS_ERROR;
3468                 }
3469         } else {
3470                 old_el = &msg->elements[0];
3471                 old_el->flags = LDB_FLAG_MOD_REPLACE;
3472         }
3473
3474         /* parse the existing links */
3475         ret = get_parsed_dns(module, tmp_ctx, old_el, &pdn_list, attr->syntax->ldap_oid);
3476         if (ret != LDB_SUCCESS) {
3477                 talloc_free(tmp_ctx);
3478                 return ret;
3479         }
3480
3481         /* get our invocationId */
3482         our_invocation_id = samdb_ntds_invocation_id(ldb);
3483         if (!our_invocation_id) {
3484                 ldb_debug_set(ldb, LDB_DEBUG_ERROR, __location__ ": unable to find invocationId\n");
3485                 talloc_free(tmp_ctx);
3486                 return LDB_ERR_OPERATIONS_ERROR;
3487         }
3488
3489         ret = replmd_check_upgrade_links(pdn_list, old_el->num_values, our_invocation_id);
3490         if (ret != LDB_SUCCESS) {
3491                 talloc_free(tmp_ctx);
3492                 return ret;
3493         }
3494
3495         status = dsdb_dn_la_from_blob(ldb, attr, schema, tmp_ctx, la->value.blob, &dsdb_dn);
3496         if (!W_ERROR_IS_OK(status)) {
3497                 ldb_asprintf_errstring(ldb, "Failed to parsed linked attribute blob for %s on %s - %s\n",
3498                                        old_el->name, ldb_dn_get_linearized(msg->dn), win_errstr(status));
3499                 return LDB_ERR_OPERATIONS_ERROR;
3500         }
3501
3502         ntstatus = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid, "GUID");
3503         if (!NT_STATUS_IS_OK(ntstatus) && active) {
3504                 ldb_asprintf_errstring(ldb, "Failed to find GUID in linked attribute blob for %s on %s from %s",
3505                                        old_el->name,
3506                                        ldb_dn_get_linearized(dsdb_dn->dn),
3507                                        ldb_dn_get_linearized(msg->dn));
3508                 return LDB_ERR_OPERATIONS_ERROR;
3509         }
3510
3511         /* re-resolve the DN by GUID, as the DRS server may give us an
3512            old DN value */
3513         ret = dsdb_module_dn_by_guid(module, dsdb_dn, &guid, &dsdb_dn->dn);
3514         if (ret != LDB_SUCCESS) {
3515                 ldb_asprintf_errstring(ldb, __location__ ": Failed to re-resolve GUID %s",
3516                                        GUID_string(tmp_ctx, &guid));
3517                 talloc_free(tmp_ctx);
3518                 return ret;
3519         }
3520
3521         /* see if this link already exists */
3522         pdn = parsed_dn_find(pdn_list, old_el->num_values, &guid, dsdb_dn->dn);
3523         if (pdn != NULL) {
3524                 /* see if this update is newer than what we have already */
3525                 struct GUID invocation_id = GUID_zero();
3526                 uint32_t version = 0;
3527                 NTTIME change_time = 0;
3528                 uint32_t rmd_flags = dsdb_dn_rmd_flags(pdn->dsdb_dn->dn);
3529
3530                 dsdb_get_extended_dn_guid(pdn->dsdb_dn->dn, &invocation_id, "RMD_INVOCID");
3531                 dsdb_get_extended_dn_uint32(pdn->dsdb_dn->dn, &version, "RMD_VERSION");
3532                 dsdb_get_extended_dn_nttime(pdn->dsdb_dn->dn, &change_time, "RMD_CHANGETIME");
3533
3534                 if (!replmd_update_is_newer(&invocation_id,
3535                                             &la->meta_data.originating_invocation_id,
3536                                             version,
3537                                             la->meta_data.version,
3538                                             change_time,
3539                                             la->meta_data.originating_change_time)) {
3540                         DEBUG(1,("Discarding older DRS linked attribute update to %s on %s from %s\n",
3541                                  old_el->name, ldb_dn_get_linearized(msg->dn),
3542                                  GUID_string(tmp_ctx, &la->meta_data.originating_invocation_id)));
3543                         talloc_free(tmp_ctx);
3544                         return LDB_SUCCESS;
3545                 }
3546
3547                 /* get a seq_num for this change */
3548                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
3549                 if (ret != LDB_SUCCESS) {
3550                         talloc_free(tmp_ctx);
3551                         return ret;
3552                 }
3553
3554                 if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
3555                         /* remove the existing backlink */
3556                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, false, attr, false);
3557                         if (ret != LDB_SUCCESS) {
3558                                 talloc_free(tmp_ctx);
3559                                 return ret;
3560                         }
3561                 }
3562
3563                 ret = replmd_update_la_val(tmp_ctx, pdn->v, dsdb_dn, pdn->dsdb_dn,
3564                                            &la->meta_data.originating_invocation_id,
3565                                            la->meta_data.originating_usn, seq_num,
3566                                            la->meta_data.originating_change_time,
3567                                            la->meta_data.version,
3568                                            !active);
3569                 if (ret != LDB_SUCCESS) {
3570                         talloc_free(tmp_ctx);
3571                         return ret;
3572                 }
3573
3574                 if (active) {
3575                         /* add the new backlink */
3576                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, true, attr, false);
3577                         if (ret != LDB_SUCCESS) {
3578                                 talloc_free(tmp_ctx);
3579                                 return ret;
3580                         }
3581                 }
3582         } else {
3583                 /* get a seq_num for this change */
3584                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
3585                 if (ret != LDB_SUCCESS) {
3586                         talloc_free(tmp_ctx);
3587                         return ret;
3588                 }
3589
3590                 old_el->values = talloc_realloc(msg->elements, old_el->values,
3591                                                 struct ldb_val, old_el->num_values+1);
3592                 if (!old_el->values) {
3593                         ldb_module_oom(module);
3594                         return LDB_ERR_OPERATIONS_ERROR;
3595                 }
3596                 old_el->num_values++;
3597
3598                 ret = replmd_build_la_val(tmp_ctx, &old_el->values[old_el->num_values-1], dsdb_dn,
3599                                           &la->meta_data.originating_invocation_id,
3600                                           la->meta_data.originating_usn, seq_num,
3601                                           la->meta_data.originating_change_time,
3602                                           la->meta_data.version,
3603                                           (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?false:true);
3604                 if (ret != LDB_SUCCESS) {
3605                         talloc_free(tmp_ctx);
3606                         return ret;
3607                 }
3608
3609                 if (active) {
3610                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid,
3611                                                   true, attr, false);
3612                         if (ret != LDB_SUCCESS) {
3613                                 talloc_free(tmp_ctx);
3614                                 return ret;
3615                         }
3616                 }
3617         }
3618
3619         /* we only change whenChanged and uSNChanged if the seq_num
3620            has changed */
3621         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
3622                 talloc_free(tmp_ctx);
3623                 return LDB_ERR_OPERATIONS_ERROR;
3624         }
3625
3626         if (add_uint64_element(msg, "uSNChanged", seq_num) != LDB_SUCCESS) {
3627                 talloc_free(tmp_ctx);
3628                 return LDB_ERR_OPERATIONS_ERROR;
3629         }
3630
3631         ret = dsdb_check_single_valued_link(attr, old_el);
3632         if (ret != LDB_SUCCESS) {
3633                 talloc_free(tmp_ctx);
3634                 return ret;
3635         }
3636
3637         ret = dsdb_module_modify(module, msg, DSDB_MODIFY_RELAX);
3638         if (ret != LDB_SUCCESS) {
3639                 ldb_debug(ldb, LDB_DEBUG_WARNING, "Failed to apply linked attribute change '%s'\n%s\n",
3640                           ldb_errstring(ldb),
3641                           ldb_ldif_message_string(ldb, tmp_ctx, LDB_CHANGETYPE_MODIFY, msg));
3642                 talloc_free(tmp_ctx);
3643                 return ret;
3644         }
3645
3646         talloc_free(tmp_ctx);
3647
3648         return ret;
3649 }
3650
3651 static int replmd_extended(struct ldb_module *module, struct ldb_request *req)
3652 {
3653         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_REPLICATED_OBJECTS_OID) == 0) {
3654                 return replmd_extended_replicated_objects(module, req);
3655         }
3656
3657         return ldb_next_request(module, req);
3658 }
3659
3660
3661 /*
3662   we hook into the transaction operations to allow us to
3663   perform the linked attribute updates at the end of the whole
3664   transaction. This allows a forward linked attribute to be created
3665   before the object is created. During a vampire, w2k8 sends us linked
3666   attributes before the objects they are part of.
3667  */
3668 static int replmd_start_transaction(struct ldb_module *module)
3669 {
3670         /* create our private structure for this transaction */
3671         struct replmd_private *replmd_private = talloc_get_type(ldb_module_get_private(module),
3672                                                                 struct replmd_private);
3673         replmd_txn_cleanup(replmd_private);
3674
3675         /* free any leftover mod_usn records from cancelled
3676            transactions */
3677         while (replmd_private->ncs) {
3678                 struct nc_entry *e = replmd_private->ncs;
3679                 DLIST_REMOVE(replmd_private->ncs, e);
3680                 talloc_free(e);
3681         }
3682
3683         return ldb_next_start_trans(module);
3684 }
3685
3686 /*
3687   on prepare commit we loop over our queued la_context structures and
3688   apply each of them
3689  */
3690 static int replmd_prepare_commit(struct ldb_module *module)
3691 {
3692         struct replmd_private *replmd_private =
3693                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3694         struct la_entry *la, *prev;
3695         struct la_backlink *bl;
3696         int ret;
3697
3698         /* walk the list backwards, to do the first entry first, as we
3699          * added the entries with DLIST_ADD() which puts them at the
3700          * start of the list */
3701         for (la = replmd_private->la_list; la && la->next; la=la->next) ;
3702
3703         for (; la; la=prev) {
3704                 prev = la->prev;
3705                 DLIST_REMOVE(replmd_private->la_list, la);
3706                 ret = replmd_process_linked_attribute(module, la);
3707                 if (ret != LDB_SUCCESS) {
3708                         replmd_txn_cleanup(replmd_private);
3709                         return ret;
3710                 }
3711         }
3712
3713         /* process our backlink list, creating and deleting backlinks
3714            as necessary */
3715         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
3716                 ret = replmd_process_backlink(module, bl);
3717                 if (ret != LDB_SUCCESS) {
3718                         replmd_txn_cleanup(replmd_private);
3719                         return ret;
3720                 }
3721         }
3722
3723         replmd_txn_cleanup(replmd_private);
3724
3725         /* possibly change @REPLCHANGED */
3726         ret = replmd_notify_store(module);
3727         if (ret != LDB_SUCCESS) {
3728                 return ret;
3729         }
3730
3731         return ldb_next_prepare_commit(module);
3732 }
3733
3734 static int replmd_del_transaction(struct ldb_module *module)
3735 {
3736         struct replmd_private *replmd_private =
3737                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3738         replmd_txn_cleanup(replmd_private);
3739
3740         return ldb_next_del_trans(module);
3741 }
3742
3743
3744 _PUBLIC_ const struct ldb_module_ops ldb_repl_meta_data_module_ops = {
3745         .name          = "repl_meta_data",
3746         .init_context      = replmd_init,
3747         .add               = replmd_add,
3748         .modify            = replmd_modify,
3749         .rename            = replmd_rename,
3750         .del               = replmd_delete,
3751         .extended          = replmd_extended,
3752         .start_transaction = replmd_start_transaction,
3753         .prepare_commit    = replmd_prepare_commit,
3754         .del_transaction   = replmd_del_transaction,
3755 };