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    Copyright (C) Matthieu Patou <mat@samba.org> 2010
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 /*
  25  *  Name: ldb
  26  *
  27  *  Component: ldb repl_meta_data module
  28  *
  29  *  Description: - add a unique objectGUID onto every new record,
  30  *               - handle whenCreated, whenChanged timestamps
  31  *               - handle uSNCreated, uSNChanged numbers
  32  *               - handle replPropertyMetaData attribute
  33  *
  34  *  Author: Simo Sorce
  35  *  Author: Stefan Metzmacher
  36  */
  37
  38 #include "includes.h"
  39 #include "ldb_module.h"
  40 #include "dsdb/samdb/samdb.h"
  41 #include "dsdb/common/proto.h"
  42 #include "../libds/common/flags.h"
  43 #include "librpc/gen_ndr/ndr_misc.h"
  44 #include "librpc/gen_ndr/ndr_drsuapi.h"
  45 #include "librpc/gen_ndr/ndr_drsblobs.h"
  46 #include "param/param.h"
  47 #include "libcli/security/dom_sid.h"
  48 #include "lib/util/dlinklist.h"
  49 #include "dsdb/samdb/ldb_modules/util.h"
  50 #include "lib/util/binsearch.h"
  51 #include "libcli/security/security.h"
  52 #include "lib/util/tsort.h"
  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                 uint64_t mod_usn_urgent;
  64         } *ncs;
  65 };
  66
  67 struct la_entry {
  68         struct la_entry *next, *prev;
  69         struct drsuapi_DsReplicaLinkedAttribute *la;
  70 };
  71
  72 struct replmd_replicated_request {
  73         struct ldb_module *module;
  74         struct ldb_request *req;
  75
  76         const struct dsdb_schema *schema;
  77
  78         /* the controls we pass down */
  79         struct ldb_control **controls;
  80
  81         /* details for the mode where we apply a bunch of inbound replication meessages */
  82         bool apply_mode;
  83         uint32_t index_current;
  84         struct dsdb_extended_replicated_objects *objs;
  85
  86         struct ldb_message *search_msg;
  87
  88         uint64_t seq_num;
  89         bool is_urgent;
  90 };
  91
  92 enum urgent_situation {
  93         REPL_URGENT_ON_CREATE = 1,
  94         REPL_URGENT_ON_UPDATE = 2,
  95         REPL_URGENT_ON_DELETE = 4
  96 };
  97
  98
  99 static const struct {
 100         const char *update_name;
 101         enum urgent_situation repl_situation;
 102 } urgent_objects[] = {
 103                 {"nTDSDSA", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_DELETE)},
 104                 {"crossRef", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_DELETE)},
 105                 {"attributeSchema", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 106                 {"classSchema", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 107                 {"secret", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 108                 {"rIDManager", (REPL_URGENT_ON_CREATE | REPL_URGENT_ON_UPDATE)},
 109                 {NULL, 0}
 110 };
 111
 112 /* Attributes looked for when updating or deleting, to check for a urgent replication needed */
 113 static const char *urgent_attrs[] = {
 114                 "lockoutTime",
 115                 "pwdLastSet",
 116                 "userAccountControl",
 117                 NULL
 118 };
 119
 120
 121 static bool replmd_check_urgent_objectclass(const struct ldb_message_element *objectclass_el,
 122                                         enum urgent_situation situation)
 123 {
 124         unsigned int i, j;
 125         for (i=0; urgent_objects[i].update_name; i++) {
 126
 127                 if ((situation & urgent_objects[i].repl_situation) == 0) {
 128                         continue;
 129                 }
 130
 131                 for (j=0; j<objectclass_el->num_values; j++) {
 132                         const struct ldb_val *v = &objectclass_el->values[j];
 133                         if (ldb_attr_cmp((const char *)v->data, urgent_objects[i].update_name) == 0) {
 134                                 return true;
 135                         }
 136                 }
 137         }
 138         return false;
 139 }
 140
 141 static bool replmd_check_urgent_attribute(const struct ldb_message_element *el)
 142 {
 143         if (ldb_attr_in_list(urgent_attrs, el->name)) {
 144                 return true;
 145         }
 146         return false;
 147 }
 148
 149
 150 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar);
 151
 152 /*
 153   initialise the module
 154   allocate the private structure and build the list
 155   of partition DNs for use by replmd_notify()
 156  */
 157 static int replmd_init(struct ldb_module *module)
 158 {
 159         struct replmd_private *replmd_private;
 160         struct ldb_context *ldb = ldb_module_get_ctx(module);
 161
 162         replmd_private = talloc_zero(module, struct replmd_private);
 163         if (replmd_private == NULL) {
 164                 ldb_oom(ldb);
 165                 return LDB_ERR_OPERATIONS_ERROR;
 166         }
 167         ldb_module_set_private(module, replmd_private);
 168
 169         return ldb_next_init(module);
 170 }
 171
 172 /*
 173   cleanup our per-transaction contexts
 174  */
 175 static void replmd_txn_cleanup(struct replmd_private *replmd_private)
 176 {
 177         talloc_free(replmd_private->la_ctx);
 178         replmd_private->la_list = NULL;
 179         replmd_private->la_ctx = NULL;
 180
 181         talloc_free(replmd_private->bl_ctx);
 182         replmd_private->la_backlinks = NULL;
 183         replmd_private->bl_ctx = NULL;
 184 }
 185
 186
 187 struct la_backlink {
 188         struct la_backlink *next, *prev;
 189         const char *attr_name;
 190         struct GUID forward_guid, target_guid;
 191         bool active;
 192 };
 193
 194 /*
 195   process a backlinks we accumulated during a transaction, adding and
 196   deleting the backlinks from the target objects
 197  */
 198 static int replmd_process_backlink(struct ldb_module *module, struct la_backlink *bl)
 199 {
 200         struct ldb_dn *target_dn, *source_dn;
 201         int ret;
 202         struct ldb_context *ldb = ldb_module_get_ctx(module);
 203         struct ldb_message *msg;
 204         TALLOC_CTX *tmp_ctx = talloc_new(bl);
 205         char *dn_string;
 206
 207         /*
 208           - find DN of target
 209           - find DN of source
 210           - construct ldb_message
 211               - either an add or a delete
 212          */
 213         ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->target_guid, &target_dn);
 214         if (ret != LDB_SUCCESS) {
 215                 DEBUG(2,(__location__ ": WARNING: Failed to find target DN for linked attribute with GUID %s\n",
 216                          GUID_string(bl, &bl->target_guid)));
 217                 return LDB_SUCCESS;
 218         }
 219
 220         ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->forward_guid, &source_dn);
 221         if (ret != LDB_SUCCESS) {
 222                 ldb_asprintf_errstring(ldb, "Failed to find source DN for linked attribute with GUID %s\n",
 223                                        GUID_string(bl, &bl->forward_guid));
 224                 talloc_free(tmp_ctx);
 225                 return ret;
 226         }
 227
 228         msg = ldb_msg_new(tmp_ctx);
 229         if (msg == NULL) {
 230                 ldb_module_oom(module);
 231                 talloc_free(tmp_ctx);
 232                 return LDB_ERR_OPERATIONS_ERROR;
 233         }
 234
 235         /* construct a ldb_message for adding/deleting the backlink */
 236         msg->dn = target_dn;
 237         dn_string = ldb_dn_get_extended_linearized(tmp_ctx, source_dn, 1);
 238         if (!dn_string) {
 239                 ldb_module_oom(module);
 240                 talloc_free(tmp_ctx);
 241                 return LDB_ERR_OPERATIONS_ERROR;
 242         }
 243         ret = ldb_msg_add_steal_string(msg, bl->attr_name, dn_string);
 244         if (ret != LDB_SUCCESS) {
 245                 talloc_free(tmp_ctx);
 246                 return ret;
 247         }
 248         msg->elements[0].flags = bl->active?LDB_FLAG_MOD_ADD:LDB_FLAG_MOD_DELETE;
 249
 250         ret = dsdb_module_modify(module, msg, DSDB_FLAG_NEXT_MODULE);
 251         if (ret != LDB_SUCCESS) {
 252                 ldb_asprintf_errstring(ldb, "Failed to %s backlink from %s to %s - %s",
 253                                        bl->active?"add":"remove",
 254                                        ldb_dn_get_linearized(source_dn),
 255                                        ldb_dn_get_linearized(target_dn),
 256                                        ldb_errstring(ldb));
 257                 talloc_free(tmp_ctx);
 258                 return ret;
 259         }
 260         talloc_free(tmp_ctx);
 261         return ret;
 262 }
 263
 264 /*
 265   add a backlink to the list of backlinks to add/delete in the prepare
 266   commit
 267  */
 268 static int replmd_add_backlink(struct ldb_module *module, const struct dsdb_schema *schema,
 269                                struct GUID *forward_guid, struct GUID *target_guid,
 270                                bool active, const struct dsdb_attribute *schema_attr, bool immediate)
 271 {
 272         const struct dsdb_attribute *target_attr;
 273         struct la_backlink *bl;
 274         struct replmd_private *replmd_private =
 275                 talloc_get_type_abort(ldb_module_get_private(module), struct replmd_private);
 276
 277         target_attr = dsdb_attribute_by_linkID(schema, schema_attr->linkID ^ 1);
 278         if (!target_attr) {
 279                 /*
 280                  * windows 2003 has a broken schema where the
 281                  * definition of msDS-IsDomainFor is missing (which is
 282                  * supposed to be the backlink of the
 283                  * msDS-HasDomainNCs attribute
 284                  */
 285                 return LDB_SUCCESS;
 286         }
 287
 288         /* see if its already in the list */
 289         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
 290                 if (GUID_equal(forward_guid, &bl->forward_guid) &&
 291                     GUID_equal(target_guid, &bl->target_guid) &&
 292                     (target_attr->lDAPDisplayName == bl->attr_name ||
 293                      strcmp(target_attr->lDAPDisplayName, bl->attr_name) == 0)) {
 294                         break;
 295                 }
 296         }
 297
 298         if (bl) {
 299                 /* we found an existing one */
 300                 if (bl->active == active) {
 301                         return LDB_SUCCESS;
 302                 }
 303                 DLIST_REMOVE(replmd_private->la_backlinks, bl);
 304                 talloc_free(bl);
 305                 return LDB_SUCCESS;
 306         }
 307
 308         if (replmd_private->bl_ctx == NULL) {
 309                 replmd_private->bl_ctx = talloc_new(replmd_private);
 310                 if (replmd_private->bl_ctx == NULL) {
 311                         ldb_module_oom(module);
 312                         return LDB_ERR_OPERATIONS_ERROR;
 313                 }
 314         }
 315
 316         /* its a new one */
 317         bl = talloc(replmd_private->bl_ctx, struct la_backlink);
 318         if (bl == NULL) {
 319                 ldb_module_oom(module);
 320                 return LDB_ERR_OPERATIONS_ERROR;
 321         }
 322
 323         /* Ensure the schema does not go away before the bl->attr_name is used */
 324         if (!talloc_reference(bl, schema)) {
 325                 talloc_free(bl);
 326                 ldb_module_oom(module);
 327                 return LDB_ERR_OPERATIONS_ERROR;
 328         }
 329
 330         bl->attr_name = target_attr->lDAPDisplayName;
 331         bl->forward_guid = *forward_guid;
 332         bl->target_guid = *target_guid;
 333         bl->active = active;
 334
 335         /* the caller may ask for this backlink to be processed
 336            immediately */
 337         if (immediate) {
 338                 int ret = replmd_process_backlink(module, bl);
 339                 talloc_free(bl);
 340                 return ret;
 341         }
 342
 343         DLIST_ADD(replmd_private->la_backlinks, bl);
 344
 345         return LDB_SUCCESS;
 346 }
 347
 348
 349 /*
 350  * Callback for most write operations in this module:
 351  *
 352  * notify the repl task that a object has changed. The notifies are
 353  * gathered up in the replmd_private structure then written to the
 354  * @REPLCHANGED object in each partition during the prepare_commit
 355  */
 356 static int replmd_op_callback(struct ldb_request *req, struct ldb_reply *ares)
 357 {
 358         int ret;
 359         struct replmd_replicated_request *ac =
 360                 talloc_get_type_abort(req->context, struct replmd_replicated_request);
 361         struct replmd_private *replmd_private =
 362                 talloc_get_type_abort(ldb_module_get_private(ac->module), struct replmd_private);
 363         struct nc_entry *modified_partition;
 364         struct ldb_control *partition_ctrl;
 365         const struct dsdb_control_current_partition *partition;
 366
 367         struct ldb_control **controls;
 368
 369         partition_ctrl = ldb_reply_get_control(ares, DSDB_CONTROL_CURRENT_PARTITION_OID);
 370
 371         /* Remove the 'partition' control from what we pass up the chain */
 372         controls = controls_except_specified(ares->controls, ares, partition_ctrl);
 373
 374         if (ares->error != LDB_SUCCESS) {
 375                 return ldb_module_done(ac->req, controls,
 376                                         ares->response, ares->error);
 377         }
 378
 379         if (ares->type != LDB_REPLY_DONE) {
 380                 ldb_set_errstring(ldb_module_get_ctx(ac->module), "Invalid reply type for notify\n!");
 381                 return ldb_module_done(ac->req, NULL,
 382                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 383         }
 384
 385         if (!partition_ctrl) {
 386                 ldb_set_errstring(ldb_module_get_ctx(ac->module),"No partition control on reply");
 387                 return ldb_module_done(ac->req, NULL,
 388                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 389         }
 390
 391         partition = talloc_get_type_abort(partition_ctrl->data,
 392                                     struct dsdb_control_current_partition);
 393
 394         if (ac->seq_num > 0) {
 395                 for (modified_partition = replmd_private->ncs; modified_partition;
 396                      modified_partition = modified_partition->next) {
 397                         if (ldb_dn_compare(modified_partition->dn, partition->dn) == 0) {
 398                                 break;
 399                         }
 400                 }
 401
 402                 if (modified_partition == NULL) {
 403                         modified_partition = talloc_zero(replmd_private, struct nc_entry);
 404                         if (!modified_partition) {
 405                                 ldb_oom(ldb_module_get_ctx(ac->module));
 406                                 return ldb_module_done(ac->req, NULL,
 407                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 408                         }
 409                         modified_partition->dn = ldb_dn_copy(modified_partition, partition->dn);
 410                         if (!modified_partition->dn) {
 411                                 ldb_oom(ldb_module_get_ctx(ac->module));
 412                                 return ldb_module_done(ac->req, NULL,
 413                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 414                         }
 415                         DLIST_ADD(replmd_private->ncs, modified_partition);
 416                 }
 417
 418                 if (ac->seq_num > modified_partition->mod_usn) {
 419                         modified_partition->mod_usn = ac->seq_num;
 420                         if (ac->is_urgent) {
 421                                 modified_partition->mod_usn_urgent = ac->seq_num;
 422                         }
 423                 }
 424         }
 425
 426         if (ac->apply_mode) {
 427                 talloc_free(ares);
 428                 ac->index_current++;
 429
 430                 ret = replmd_replicated_apply_next(ac);
 431                 if (ret != LDB_SUCCESS) {
 432                         return ldb_module_done(ac->req, NULL, NULL, ret);
 433                 }
 434                 return ret;
 435         } else {
 436                 /* free the partition control container here, for the
 437                  * common path.  Other cases will have it cleaned up
 438                  * eventually with the ares */
 439                 talloc_free(partition_ctrl);
 440                 return ldb_module_done(ac->req,
 441                                        controls_except_specified(controls, ares, partition_ctrl),
 442                                        ares->response, LDB_SUCCESS);
 443         }
 444 }
 445
 446
 447 /*
 448  * update a @REPLCHANGED record in each partition if there have been
 449  * any writes of replicated data in the partition
 450  */
 451 static int replmd_notify_store(struct ldb_module *module)
 452 {
 453         struct replmd_private *replmd_private =
 454                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
 455
 456         while (replmd_private->ncs) {
 457                 int ret;
 458                 struct nc_entry *modified_partition = replmd_private->ncs;
 459
 460                 ret = dsdb_module_save_partition_usn(module, modified_partition->dn,
 461                                                      modified_partition->mod_usn,
 462                                                      modified_partition->mod_usn_urgent);
 463                 if (ret != LDB_SUCCESS) {
 464                         DEBUG(0,(__location__ ": Failed to save partition uSN for %s\n",
 465                                  ldb_dn_get_linearized(modified_partition->dn)));
 466                         return ret;
 467                 }
 468                 DLIST_REMOVE(replmd_private->ncs, modified_partition);
 469                 talloc_free(modified_partition);
 470         }
 471
 472         return LDB_SUCCESS;
 473 }
 474
 475
 476 /*
 477   created a replmd_replicated_request context
 478  */
 479 static struct replmd_replicated_request *replmd_ctx_init(struct ldb_module *module,
 480                                                          struct ldb_request *req)
 481 {
 482         struct ldb_context *ldb;
 483         struct replmd_replicated_request *ac;
 484
 485         ldb = ldb_module_get_ctx(module);
 486
 487         ac = talloc_zero(req, struct replmd_replicated_request);
 488         if (ac == NULL) {
 489                 ldb_oom(ldb);
 490                 return NULL;
 491         }
 492
 493         ac->module = module;
 494         ac->req = req;
 495
 496         ac->schema = dsdb_get_schema(ldb, ac);
 497         if (!ac->schema) {
 498                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
 499                               "replmd_modify: no dsdb_schema loaded");
 500                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
 501                 return NULL;
 502         }
 503
 504         return ac;
 505 }
 506
 507 /*
 508   add a time element to a record
 509 */
 510 static int add_time_element(struct ldb_message *msg, const char *attr, time_t t)
 511 {
 512         struct ldb_message_element *el;
 513         char *s;
 514
 515         if (ldb_msg_find_element(msg, attr) != NULL) {
 516                 return LDB_SUCCESS;
 517         }
 518
 519         s = ldb_timestring(msg, t);
 520         if (s == NULL) {
 521                 return LDB_ERR_OPERATIONS_ERROR;
 522         }
 523
 524         if (ldb_msg_add_string(msg, attr, s) != LDB_SUCCESS) {
 525                 return LDB_ERR_OPERATIONS_ERROR;
 526         }
 527
 528         el = ldb_msg_find_element(msg, attr);
 529         /* always set as replace. This works because on add ops, the flag
 530            is ignored */
 531         el->flags = LDB_FLAG_MOD_REPLACE;
 532
 533         return LDB_SUCCESS;
 534 }
 535
 536 /*
 537   add a uint64_t element to a record
 538 */
 539 static int add_uint64_element(struct ldb_message *msg, const char *attr, uint64_t v)
 540 {
 541         struct ldb_message_element *el;
 542
 543         if (ldb_msg_find_element(msg, attr) != NULL) {
 544                 return LDB_SUCCESS;
 545         }
 546
 547         if (ldb_msg_add_fmt(msg, attr, "%llu", (unsigned long long)v) != LDB_SUCCESS) {
 548                 return LDB_ERR_OPERATIONS_ERROR;
 549         }
 550
 551         el = ldb_msg_find_element(msg, attr);
 552         /* always set as replace. This works because on add ops, the flag
 553            is ignored */
 554         el->flags = LDB_FLAG_MOD_REPLACE;
 555
 556         return LDB_SUCCESS;
 557 }
 558
 559 static int replmd_replPropertyMetaData1_attid_sort(const struct replPropertyMetaData1 *m1,
 560                                                    const struct replPropertyMetaData1 *m2,
 561                                                    const uint32_t *rdn_attid)
 562 {
 563         if (m1->attid == m2->attid) {
 564                 return 0;
 565         }
 566
 567         /*
 568          * the rdn attribute should be at the end!
 569          * so we need to return a value greater than zero
 570          * which means m1 is greater than m2
 571          */
 572         if (m1->attid == *rdn_attid) {
 573                 return 1;
 574         }
 575
 576         /*
 577          * the rdn attribute should be at the end!
 578          * so we need to return a value less than zero
 579          * which means m2 is greater than m1
 580          */
 581         if (m2->attid == *rdn_attid) {
 582                 return -1;
 583         }
 584
 585         return m1->attid > m2->attid ? 1 : -1;
 586 }
 587
 588 static int replmd_replPropertyMetaDataCtr1_sort(struct replPropertyMetaDataCtr1 *ctr1,
 589                                                 const struct dsdb_schema *schema,
 590                                                 struct ldb_dn *dn)
 591 {
 592         const char *rdn_name;
 593         const struct dsdb_attribute *rdn_sa;
 594
 595         rdn_name = ldb_dn_get_rdn_name(dn);
 596         if (!rdn_name) {
 597                 DEBUG(0,(__location__ ": No rDN for %s?\n", ldb_dn_get_linearized(dn)));
 598                 return LDB_ERR_OPERATIONS_ERROR;
 599         }
 600
 601         rdn_sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
 602         if (rdn_sa == NULL) {
 603                 DEBUG(0,(__location__ ": No sa found for rDN %s for %s\n", rdn_name, ldb_dn_get_linearized(dn)));
 604                 return LDB_ERR_OPERATIONS_ERROR;
 605         }
 606
 607         DEBUG(6,("Sorting rpmd with attid exception %u rDN=%s DN=%s\n",
 608                  rdn_sa->attributeID_id, rdn_name, ldb_dn_get_linearized(dn)));
 609
 610         LDB_TYPESAFE_QSORT(ctr1->array, ctr1->count, &rdn_sa->attributeID_id, replmd_replPropertyMetaData1_attid_sort);
 611
 612         return LDB_SUCCESS;
 613 }
 614
 615 static int replmd_ldb_message_element_attid_sort(const struct ldb_message_element *e1,
 616                                                  const struct ldb_message_element *e2,
 617                                                  const struct dsdb_schema *schema)
 618 {
 619         const struct dsdb_attribute *a1;
 620         const struct dsdb_attribute *a2;
 621
 622         /*
 623          * TODO: make this faster by caching the dsdb_attribute pointer
 624          *       on the ldb_messag_element
 625          */
 626
 627         a1 = dsdb_attribute_by_lDAPDisplayName(schema, e1->name);
 628         a2 = dsdb_attribute_by_lDAPDisplayName(schema, e2->name);
 629
 630         /*
 631          * TODO: remove this check, we should rely on e1 and e2 having valid attribute names
 632          *       in the schema
 633          */
 634         if (!a1 || !a2) {
 635                 return strcasecmp(e1->name, e2->name);
 636         }
 637         if (a1->attributeID_id == a2->attributeID_id) {
 638                 return 0;
 639         }
 640         return a1->attributeID_id > a2->attributeID_id ? 1 : -1;
 641 }
 642
 643 static void replmd_ldb_message_sort(struct ldb_message *msg,
 644                                     const struct dsdb_schema *schema)
 645 {
 646         LDB_TYPESAFE_QSORT(msg->elements, msg->num_elements, schema, replmd_ldb_message_element_attid_sort);
 647 }
 648
 649 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
 650                                const struct GUID *invocation_id, uint64_t seq_num,
 651                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted);
 652
 653
 654 /*
 655   fix up linked attributes in replmd_add.
 656   This involves setting up the right meta-data in extended DN
 657   components, and creating backlinks to the object
 658  */
 659 static int replmd_add_fix_la(struct ldb_module *module, struct ldb_message_element *el,
 660                              uint64_t seq_num, const struct GUID *invocationId, time_t t,
 661                              struct GUID *guid, const struct dsdb_attribute *sa)
 662 {
 663         unsigned int i;
 664         TALLOC_CTX *tmp_ctx = talloc_new(el->values);
 665         struct ldb_context *ldb = ldb_module_get_ctx(module);
 666
 667         /* We will take a reference to the schema in replmd_add_backlink */
 668         const struct dsdb_schema *schema = dsdb_get_schema(ldb, NULL);
 669         NTTIME now;
 670
 671         unix_to_nt_time(&now, t);
 672
 673         for (i=0; i<el->num_values; i++) {
 674                 struct ldb_val *v = &el->values[i];
 675                 struct dsdb_dn *dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, v, sa->syntax->ldap_oid);
 676                 struct GUID target_guid;
 677                 NTSTATUS status;
 678                 int ret;
 679
 680                 /* note that the DN already has the extended
 681                    components from the extended_dn_store module */
 682                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
 683                 if (!NT_STATUS_IS_OK(status) || GUID_all_zero(&target_guid)) {
 684                         ret = dsdb_module_guid_by_dn(module, dsdb_dn->dn, &target_guid);
 685                         if (ret != LDB_SUCCESS) {
 686                                 talloc_free(tmp_ctx);
 687                                 return ret;
 688                         }
 689                         ret = dsdb_set_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
 690                         if (ret != LDB_SUCCESS) {
 691                                 talloc_free(tmp_ctx);
 692                                 return ret;
 693                         }
 694                 }
 695
 696                 ret = replmd_build_la_val(el->values, v, dsdb_dn, invocationId,
 697                                           seq_num, seq_num, now, 0, false);
 698                 if (ret != LDB_SUCCESS) {
 699                         talloc_free(tmp_ctx);
 700                         return ret;
 701                 }
 702
 703                 ret = replmd_add_backlink(module, schema, guid, &target_guid, true, sa, false);
 704                 if (ret != LDB_SUCCESS) {
 705                         talloc_free(tmp_ctx);
 706                         return ret;
 707                 }
 708         }
 709
 710         talloc_free(tmp_ctx);
 711         return LDB_SUCCESS;
 712 }
 713
 714
 715 /*
 716   intercept add requests
 717  */
 718 static int replmd_add(struct ldb_module *module, struct ldb_request *req)
 719 {
 720         struct ldb_context *ldb;
 721         struct ldb_control *control;
 722         struct replmd_replicated_request *ac;
 723         enum ndr_err_code ndr_err;
 724         struct ldb_request *down_req;
 725         struct ldb_message *msg;
 726         const DATA_BLOB *guid_blob;
 727         struct GUID guid;
 728         struct replPropertyMetaDataBlob nmd;
 729         struct ldb_val nmd_value;
 730         const struct GUID *our_invocation_id;
 731         time_t t = time(NULL);
 732         NTTIME now;
 733         char *time_str;
 734         int ret;
 735         unsigned int i;
 736         unsigned int functional_level;
 737         uint32_t ni=0;
 738         bool allow_add_guid = false;
 739         bool remove_current_guid = false;
 740         bool is_urgent = false;
 741         struct ldb_message_element *objectclass_el;
 742
 743         /* check if there's a show relax control (used by provision to say 'I know what I'm doing') */
 744         control = ldb_request_get_control(req, LDB_CONTROL_RELAX_OID);
 745         if (control) {
 746                 allow_add_guid = true;
 747         }
 748
 749         /* do not manipulate our control entries */
 750         if (ldb_dn_is_special(req->op.add.message->dn)) {
 751                 return ldb_next_request(module, req);
 752         }
 753
 754         ldb = ldb_module_get_ctx(module);
 755
 756         functional_level = dsdb_functional_level(ldb);
 757
 758         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_add\n");
 759
 760         ac = replmd_ctx_init(module, req);
 761         if (!ac) {
 762                 return LDB_ERR_OPERATIONS_ERROR;
 763         }
 764
 765         guid_blob = ldb_msg_find_ldb_val(req->op.add.message, "objectGUID");
 766         if ( guid_blob != NULL ) {
 767                 if( !allow_add_guid ) {
 768                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 769                               "replmd_add: it's not allowed to add an object with objectGUID\n");
 770                         talloc_free(ac);
 771                         return LDB_ERR_UNWILLING_TO_PERFORM;
 772                 } else {
 773                         NTSTATUS status = GUID_from_data_blob(guid_blob,&guid);
 774                         if ( !NT_STATUS_IS_OK(status)) {
 775                                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 776                                       "replmd_add: Unable to parse as a GUID the attribute objectGUID\n");
 777                                 talloc_free(ac);
 778                                 return LDB_ERR_UNWILLING_TO_PERFORM;
 779                         }
 780                         /* we remove this attribute as it can be a string and will not be treated
 781                         correctly and then we will readd it latter on in the good format*/
 782                         remove_current_guid = true;
 783                 }
 784         } else {
 785                 /* a new GUID */
 786                 guid = GUID_random();
 787         }
 788
 789         /* Get a sequence number from the backend */
 790         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
 791         if (ret != LDB_SUCCESS) {
 792                 talloc_free(ac);
 793                 return ret;
 794         }
 795
 796         /* get our invocationId */
 797         our_invocation_id = samdb_ntds_invocation_id(ldb);
 798         if (!our_invocation_id) {
 799                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 800                               "replmd_add: unable to find invocationId\n");
 801                 talloc_free(ac);
 802                 return LDB_ERR_OPERATIONS_ERROR;
 803         }
 804
 805         /* we have to copy the message as the caller might have it as a const */
 806         msg = ldb_msg_copy_shallow(ac, req->op.add.message);
 807         if (msg == NULL) {
 808                 ldb_oom(ldb);
 809                 talloc_free(ac);
 810                 return LDB_ERR_OPERATIONS_ERROR;
 811         }
 812
 813         /* generated times */
 814         unix_to_nt_time(&now, t);
 815         time_str = ldb_timestring(msg, t);
 816         if (!time_str) {
 817                 ldb_oom(ldb);
 818                 talloc_free(ac);
 819                 return LDB_ERR_OPERATIONS_ERROR;
 820         }
 821         if (remove_current_guid) {
 822                 ldb_msg_remove_attr(msg,"objectGUID");
 823         }
 824
 825         /*
 826          * remove autogenerated attributes
 827          */
 828         ldb_msg_remove_attr(msg, "whenCreated");
 829         ldb_msg_remove_attr(msg, "whenChanged");
 830         ldb_msg_remove_attr(msg, "uSNCreated");
 831         ldb_msg_remove_attr(msg, "uSNChanged");
 832         ldb_msg_remove_attr(msg, "replPropertyMetaData");
 833
 834         /*
 835          * readd replicated attributes
 836          */
 837         ret = ldb_msg_add_string(msg, "whenCreated", time_str);
 838         if (ret != LDB_SUCCESS) {
 839                 ldb_oom(ldb);
 840                 talloc_free(ac);
 841                 return ret;
 842         }
 843
 844         /* build the replication meta_data */
 845         ZERO_STRUCT(nmd);
 846         nmd.version             = 1;
 847         nmd.ctr.ctr1.count      = msg->num_elements;
 848         nmd.ctr.ctr1.array      = talloc_array(msg,
 849                                                struct replPropertyMetaData1,
 850                                                nmd.ctr.ctr1.count);
 851         if (!nmd.ctr.ctr1.array) {
 852                 ldb_oom(ldb);
 853                 talloc_free(ac);
 854                 return LDB_ERR_OPERATIONS_ERROR;
 855         }
 856
 857         for (i=0; i < msg->num_elements; i++) {
 858                 struct ldb_message_element *e = &msg->elements[i];
 859                 struct replPropertyMetaData1 *m = &nmd.ctr.ctr1.array[ni];
 860                 const struct dsdb_attribute *sa;
 861
 862                 if (e->name[0] == '@') continue;
 863
 864                 sa = dsdb_attribute_by_lDAPDisplayName(ac->schema, e->name);
 865                 if (!sa) {
 866                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 867                                       "replmd_add: attribute '%s' not defined in schema\n",
 868                                       e->name);
 869                         talloc_free(ac);
 870                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
 871                 }
 872
 873                 if ((sa->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (sa->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
 874                         /* if the attribute is not replicated (0x00000001)
 875                          * or constructed (0x00000004) it has no metadata
 876                          */
 877                         continue;
 878                 }
 879
 880                 if (sa->linkID != 0 && functional_level > DS_DOMAIN_FUNCTION_2000) {
 881                         ret = replmd_add_fix_la(module, e, ac->seq_num, our_invocation_id, t, &guid, sa);
 882                         if (ret != LDB_SUCCESS) {
 883                                 talloc_free(ac);
 884                                 return ret;
 885                         }
 886                         /* linked attributes are not stored in
 887                            replPropertyMetaData in FL above w2k */
 888                         continue;
 889                 }
 890
 891                 m->attid                        = sa->attributeID_id;
 892                 m->version                      = 1;
 893                 m->originating_change_time      = now;
 894                 m->originating_invocation_id    = *our_invocation_id;
 895                 m->originating_usn              = ac->seq_num;
 896                 m->local_usn                    = ac->seq_num;
 897                 ni++;
 898         }
 899
 900         /* fix meta data count */
 901         nmd.ctr.ctr1.count = ni;
 902
 903         /*
 904          * sort meta data array, and move the rdn attribute entry to the end
 905          */
 906         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ac->schema, msg->dn);
 907         if (ret != LDB_SUCCESS) {
 908                 talloc_free(ac);
 909                 return ret;
 910         }
 911
 912         /* generated NDR encoded values */
 913         ndr_err = ndr_push_struct_blob(&nmd_value, msg,
 914                                        &nmd,
 915                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
 916         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 917                 ldb_oom(ldb);
 918                 talloc_free(ac);
 919                 return LDB_ERR_OPERATIONS_ERROR;
 920         }
 921
 922         /*
 923          * add the autogenerated values
 924          */
 925         ret = dsdb_msg_add_guid(msg, &guid, "objectGUID");
 926         if (ret != LDB_SUCCESS) {
 927                 ldb_oom(ldb);
 928                 talloc_free(ac);
 929                 return ret;
 930         }
 931         ret = ldb_msg_add_string(msg, "whenChanged", time_str);
 932         if (ret != LDB_SUCCESS) {
 933                 ldb_oom(ldb);
 934                 talloc_free(ac);
 935                 return ret;
 936         }
 937         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ac->seq_num);
 938         if (ret != LDB_SUCCESS) {
 939                 ldb_oom(ldb);
 940                 talloc_free(ac);
 941                 return ret;
 942         }
 943         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ac->seq_num);
 944         if (ret != LDB_SUCCESS) {
 945                 ldb_oom(ldb);
 946                 talloc_free(ac);
 947                 return ret;
 948         }
 949         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
 950         if (ret != LDB_SUCCESS) {
 951                 ldb_oom(ldb);
 952                 talloc_free(ac);
 953                 return ret;
 954         }
 955
 956         /*
 957          * sort the attributes by attid before storing the object
 958          */
 959         replmd_ldb_message_sort(msg, ac->schema);
 960
 961         objectclass_el = ldb_msg_find_element(msg, "objectClass");
 962         is_urgent = replmd_check_urgent_objectclass(objectclass_el,
 963                                                         REPL_URGENT_ON_CREATE);
 964
 965         ac->is_urgent = is_urgent;
 966         ret = ldb_build_add_req(&down_req, ldb, ac,
 967                                 msg,
 968                                 req->controls,
 969                                 ac, replmd_op_callback,
 970                                 req);
 971
 972         if (ret != LDB_SUCCESS) {
 973                 talloc_free(ac);
 974                 return ret;
 975         }
 976
 977         if (functional_level == DS_DOMAIN_FUNCTION_2000) {
 978                 ret = ldb_request_add_control(down_req, DSDB_CONTROL_APPLY_LINKS, false, NULL);
 979                 if (ret != LDB_SUCCESS) {
 980                         talloc_free(ac);
 981                         return ret;
 982                 }
 983         }
 984
 985         /* mark the control done */
 986         if (control) {
 987                 control->critical = 0;
 988         }
 989
 990         /* go on with the call chain */
 991         return ldb_next_request(module, down_req);
 992 }
 993
 994
 995 /*
 996  * update the replPropertyMetaData for one element
 997  */
 998 static int replmd_update_rpmd_element(struct ldb_context *ldb,
 999                                       struct ldb_message *msg,
1000                                       struct ldb_message_element *el,
1001                                       struct ldb_message_element *old_el,
1002                                       struct replPropertyMetaDataBlob *omd,
1003                                       const struct dsdb_schema *schema,
1004                                       uint64_t *seq_num,
1005                                       const struct GUID *our_invocation_id,
1006                                       NTTIME now)
1007 {
1008         uint32_t i;
1009         const struct dsdb_attribute *a;
1010         struct replPropertyMetaData1 *md1;
1011
1012         a = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
1013         if (a == NULL) {
1014                 DEBUG(0,(__location__ ": Unable to find attribute %s in schema\n",
1015                          el->name));
1016                 return LDB_ERR_OPERATIONS_ERROR;
1017         }
1018
1019         if ((a->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (a->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
1020                 return LDB_SUCCESS;
1021         }
1022
1023         /* if the attribute's value haven't changed then return LDB_SUCCESS     */
1024         if (old_el != NULL && ldb_msg_element_compare(el, old_el) == 0) {
1025                 return LDB_SUCCESS;
1026         }
1027
1028         for (i=0; i<omd->ctr.ctr1.count; i++) {
1029                 if (a->attributeID_id == omd->ctr.ctr1.array[i].attid) break;
1030         }
1031
1032         if (a->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
1033                 /* linked attributes are not stored in
1034                    replPropertyMetaData in FL above w2k, but we do
1035                    raise the seqnum for the object  */
1036                 if (*seq_num == 0 &&
1037                     ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num) != LDB_SUCCESS) {
1038                         return LDB_ERR_OPERATIONS_ERROR;
1039                 }
1040                 return LDB_SUCCESS;
1041         }
1042
1043         if (i == omd->ctr.ctr1.count) {
1044                 /* we need to add a new one */
1045                 omd->ctr.ctr1.array = talloc_realloc(msg, omd->ctr.ctr1.array,
1046                                                      struct replPropertyMetaData1, omd->ctr.ctr1.count+1);
1047                 if (omd->ctr.ctr1.array == NULL) {
1048                         ldb_oom(ldb);
1049                         return LDB_ERR_OPERATIONS_ERROR;
1050                 }
1051                 omd->ctr.ctr1.count++;
1052                 ZERO_STRUCT(omd->ctr.ctr1.array[i]);
1053         }
1054
1055         /* Get a new sequence number from the backend. We only do this
1056          * if we have a change that requires a new
1057          * replPropertyMetaData element
1058          */
1059         if (*seq_num == 0) {
1060                 int ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num);
1061                 if (ret != LDB_SUCCESS) {
1062                         return LDB_ERR_OPERATIONS_ERROR;
1063                 }
1064         }
1065
1066         md1 = &omd->ctr.ctr1.array[i];
1067         md1->version++;
1068         md1->attid                     = a->attributeID_id;
1069         md1->originating_change_time   = now;
1070         md1->originating_invocation_id = *our_invocation_id;
1071         md1->originating_usn           = *seq_num;
1072         md1->local_usn                 = *seq_num;
1073
1074         return LDB_SUCCESS;
1075 }
1076
1077 static uint64_t find_max_local_usn(struct replPropertyMetaDataBlob omd)
1078 {
1079         uint32_t count = omd.ctr.ctr1.count;
1080         uint64_t max = 0;
1081         uint32_t i;
1082         for (i=0; i < count; i++) {
1083                 struct replPropertyMetaData1 m = omd.ctr.ctr1.array[i];
1084                 if (max < m.local_usn) {
1085                         max = m.local_usn;
1086                 }
1087         }
1088         return max;
1089 }
1090
1091 /*
1092  * update the replPropertyMetaData object each time we modify an
1093  * object. This is needed for DRS replication, as the merge on the
1094  * client is based on this object
1095  */
1096 static int replmd_update_rpmd(struct ldb_module *module,
1097                               const struct dsdb_schema *schema,
1098                               struct ldb_request *req,
1099                               struct ldb_message *msg, uint64_t *seq_num,
1100                               time_t t,
1101                               bool *is_urgent)
1102 {
1103         const struct ldb_val *omd_value;
1104         enum ndr_err_code ndr_err;
1105         struct replPropertyMetaDataBlob omd;
1106         unsigned int i;
1107         NTTIME now;
1108         const struct GUID *our_invocation_id;
1109         int ret;
1110         const char *attrs[] = { "replPropertyMetaData", "*", NULL };
1111         const char *attrs2[] = { "uSNChanged", "objectClass", NULL };
1112         struct ldb_result *res;
1113         struct ldb_context *ldb;
1114         struct ldb_message_element *objectclass_el;
1115         enum urgent_situation situation;
1116         bool rodc, rmd_is_provided;
1117
1118         ldb = ldb_module_get_ctx(module);
1119
1120         our_invocation_id = samdb_ntds_invocation_id(ldb);
1121         if (!our_invocation_id) {
1122                 /* this happens during an initial vampire while
1123                    updating the schema */
1124                 DEBUG(5,("No invocationID - skipping replPropertyMetaData update\n"));
1125                 return LDB_SUCCESS;
1126         }
1127
1128         unix_to_nt_time(&now, t);
1129
1130         if (ldb_request_get_control(req, DSDB_CONTROL_CHANGEREPLMETADATA_OID)) {
1131                 rmd_is_provided = true;
1132         } else {
1133                 rmd_is_provided = false;
1134         }
1135
1136         /* if isDeleted is present and is TRUE, then we consider we are deleting,
1137          * otherwise we consider we are updating */
1138         if (ldb_msg_check_string_attribute(msg, "isDeleted", "TRUE")) {
1139                 situation = REPL_URGENT_ON_DELETE;
1140         } else {
1141                 situation = REPL_URGENT_ON_UPDATE;
1142         }
1143
1144         if (rmd_is_provided) {
1145                 /* In this case the change_replmetadata control was supplied */
1146                 /* We check that it's the only attribute that is provided
1147                  * (it's a rare case so it's better to keep the code simplier)
1148                  * We also check that the highest local_usn is bigger than
1149                  * uSNChanged. */
1150                 uint64_t db_seq;
1151                 if( msg->num_elements != 1 ||
1152                         strncmp(msg->elements[0].name,
1153                                 "replPropertyMetaData", 20) ) {
1154                         DEBUG(0,(__location__ ": changereplmetada control called without "\
1155                                 "a specified replPropertyMetaData attribute or with others\n"));
1156                         return LDB_ERR_OPERATIONS_ERROR;
1157                 }
1158                 if (situation == REPL_URGENT_ON_DELETE) {
1159                         DEBUG(0,(__location__ ": changereplmetada control can't be called when deleting an object\n"));
1160                         return LDB_ERR_OPERATIONS_ERROR;
1161                 }
1162                 omd_value = ldb_msg_find_ldb_val(msg, "replPropertyMetaData");
1163                 if (!omd_value) {
1164                         DEBUG(0,(__location__ ": replPropertyMetaData was not specified for Object %s\n",
1165                                  ldb_dn_get_linearized(msg->dn)));
1166                         return LDB_ERR_OPERATIONS_ERROR;
1167                 }
1168                 ndr_err = ndr_pull_struct_blob(omd_value, msg, &omd,
1169                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
1170                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1171                         DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
1172                                  ldb_dn_get_linearized(msg->dn)));
1173                         return LDB_ERR_OPERATIONS_ERROR;
1174                 }
1175                 *seq_num = find_max_local_usn(omd);
1176
1177                 ret = dsdb_module_search_dn(module, msg, &res, msg->dn, attrs2,
1178                                             DSDB_FLAG_NEXT_MODULE |
1179                                             DSDB_SEARCH_SHOW_DELETED |
1180                                             DSDB_SEARCH_SHOW_EXTENDED_DN |
1181                                             DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
1182                                             DSDB_SEARCH_REVEAL_INTERNALS);
1183
1184                 if (ret != LDB_SUCCESS || res->count != 1) {
1185                         DEBUG(0,(__location__ ": Object %s failed to find uSNChanged\n",
1186                                  ldb_dn_get_linearized(msg->dn)));
1187                         return LDB_ERR_OPERATIONS_ERROR;
1188                 }
1189
1190                 objectclass_el = ldb_msg_find_element(res->msgs[0], "objectClass");
1191                 if (is_urgent && replmd_check_urgent_objectclass(objectclass_el,
1192                                                                 situation)) {
1193                         *is_urgent = true;
1194                 }
1195
1196                 db_seq = ldb_msg_find_attr_as_uint64(res->msgs[0], "uSNChanged", 0);
1197                 if (*seq_num <= db_seq) {
1198                         DEBUG(0,(__location__ ": changereplmetada control provided but max(local_usn)"\
1199                                               " is less or equal to uSNChanged (max = %lld uSNChanged = %lld)\n",
1200                                  (long long)*seq_num, (long long)db_seq));
1201                         return LDB_ERR_OPERATIONS_ERROR;
1202                 }
1203
1204         } else {
1205                 /* search for the existing replPropertyMetaDataBlob. We need
1206                  * to use REVEAL and ask for DNs in storage format to support
1207                  * the check for values being the same in
1208                  * replmd_update_rpmd_element()
1209                  */
1210                 ret = dsdb_module_search_dn(module, msg, &res, msg->dn, attrs,
1211                                             DSDB_FLAG_NEXT_MODULE |
1212                                             DSDB_SEARCH_SHOW_DELETED |
1213                                             DSDB_SEARCH_SHOW_EXTENDED_DN |
1214                                             DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
1215                                             DSDB_SEARCH_REVEAL_INTERNALS);
1216                 if (ret != LDB_SUCCESS || res->count != 1) {
1217                         DEBUG(0,(__location__ ": Object %s failed to find replPropertyMetaData\n",
1218                                  ldb_dn_get_linearized(msg->dn)));
1219                         return LDB_ERR_OPERATIONS_ERROR;
1220                 }
1221
1222                 objectclass_el = ldb_msg_find_element(res->msgs[0], "objectClass");
1223                 if (is_urgent && replmd_check_urgent_objectclass(objectclass_el,
1224                                                                 situation)) {
1225                         *is_urgent = true;
1226                 }
1227
1228                 omd_value = ldb_msg_find_ldb_val(res->msgs[0], "replPropertyMetaData");
1229                 if (!omd_value) {
1230                         DEBUG(0,(__location__ ": Object %s does not have a replPropertyMetaData attribute\n",
1231                                  ldb_dn_get_linearized(msg->dn)));
1232                         return LDB_ERR_OPERATIONS_ERROR;
1233                 }
1234
1235                 ndr_err = ndr_pull_struct_blob(omd_value, msg, &omd,
1236                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
1237                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1238                         DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
1239                                  ldb_dn_get_linearized(msg->dn)));
1240                         return LDB_ERR_OPERATIONS_ERROR;
1241                 }
1242
1243                 if (omd.version != 1) {
1244                         DEBUG(0,(__location__ ": bad version %u in replPropertyMetaData for %s\n",
1245                                  omd.version, ldb_dn_get_linearized(msg->dn)));
1246                         return LDB_ERR_OPERATIONS_ERROR;
1247                 }
1248
1249                 /*we have elements that will be modified*/
1250                 if (msg->num_elements > 0) {
1251                         /*if we are RODC and this is a DRSR update then its ok*/
1252                         if (!ldb_request_get_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
1253                                 ret = samdb_rodc(ldb, &rodc);
1254                                 if (ret != LDB_SUCCESS) {
1255                                         DEBUG(4, (__location__ ": unable to tell if we are an RODC\n"));
1256                                 } else if (rodc) {
1257                                         ldb_asprintf_errstring(ldb, "RODC modify is forbidden\n");
1258                                         return LDB_ERR_REFERRAL;
1259                                 }
1260                         }
1261                 }
1262
1263                 for (i=0; i<msg->num_elements; i++) {
1264                         struct ldb_message_element *old_el;
1265                         old_el = ldb_msg_find_element(res->msgs[0], msg->elements[i].name);
1266                         ret = replmd_update_rpmd_element(ldb, msg, &msg->elements[i], old_el, &omd, schema, seq_num,
1267                                                          our_invocation_id, now);
1268                         if (ret != LDB_SUCCESS) {
1269                                 return ret;
1270                         }
1271
1272                         if (is_urgent && !*is_urgent && (situation == REPL_URGENT_ON_UPDATE)) {
1273                                 *is_urgent = replmd_check_urgent_attribute(&msg->elements[i]);
1274                         }
1275
1276                 }
1277         }
1278         /*
1279          * replmd_update_rpmd_element has done an update if the
1280          * seq_num is set
1281          */
1282         if (*seq_num != 0) {
1283                 struct ldb_val *md_value;
1284                 struct ldb_message_element *el;
1285
1286                 md_value = talloc(msg, struct ldb_val);
1287                 if (md_value == NULL) {
1288                         ldb_oom(ldb);
1289                         return LDB_ERR_OPERATIONS_ERROR;
1290                 }
1291
1292                 ret = replmd_replPropertyMetaDataCtr1_sort(&omd.ctr.ctr1, schema, msg->dn);
1293                 if (ret != LDB_SUCCESS) {
1294                         return ret;
1295                 }
1296
1297                 ndr_err = ndr_push_struct_blob(md_value, msg, &omd,
1298                                                (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
1299                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1300                         DEBUG(0,(__location__ ": Failed to marshall replPropertyMetaData for %s\n",
1301                                  ldb_dn_get_linearized(msg->dn)));
1302                         return LDB_ERR_OPERATIONS_ERROR;
1303                 }
1304
1305                 ret = ldb_msg_add_empty(msg, "replPropertyMetaData", LDB_FLAG_MOD_REPLACE, &el);
1306                 if (ret != LDB_SUCCESS) {
1307                         DEBUG(0,(__location__ ": Failed to add updated replPropertyMetaData %s\n",
1308                                  ldb_dn_get_linearized(msg->dn)));
1309                         return ret;
1310                 }
1311
1312                 el->num_values = 1;
1313                 el->values = md_value;
1314         }
1315
1316         return LDB_SUCCESS;
1317 }
1318
1319 struct parsed_dn {
1320         struct dsdb_dn *dsdb_dn;
1321         struct GUID *guid;
1322         struct ldb_val *v;
1323 };
1324
1325 static int parsed_dn_compare(struct parsed_dn *pdn1, struct parsed_dn *pdn2)
1326 {
1327         return GUID_compare(pdn1->guid, pdn2->guid);
1328 }
1329
1330 static struct parsed_dn *parsed_dn_find(struct parsed_dn *pdn, int count, struct GUID *guid, struct ldb_dn *dn)
1331 {
1332         struct parsed_dn *ret;
1333         if (dn && GUID_all_zero(guid)) {
1334                 /* when updating a link using DRS, we sometimes get a
1335                    NULL GUID. We then need to try and match by DN */
1336                 int i;
1337                 for (i=0; i<count; i++) {
1338                         if (ldb_dn_compare(pdn[i].dsdb_dn->dn, dn) == 0) {
1339                                 dsdb_get_extended_dn_guid(pdn[i].dsdb_dn->dn, guid, "GUID");
1340                                 return &pdn[i];
1341                         }
1342                 }
1343                 return NULL;
1344         }
1345         BINARY_ARRAY_SEARCH(pdn, count, guid, guid, GUID_compare, ret);
1346         return ret;
1347 }
1348
1349 /*
1350   get a series of message element values as an array of DNs and GUIDs
1351   the result is sorted by GUID
1352  */
1353 static int get_parsed_dns(struct ldb_module *module, TALLOC_CTX *mem_ctx,
1354                           struct ldb_message_element *el, struct parsed_dn **pdn,
1355                           const char *ldap_oid)
1356 {
1357         unsigned int i;
1358         struct ldb_context *ldb = ldb_module_get_ctx(module);
1359
1360         if (el == NULL) {
1361                 *pdn = NULL;
1362                 return LDB_SUCCESS;
1363         }
1364
1365         (*pdn) = talloc_array(mem_ctx, struct parsed_dn, el->num_values);
1366         if (!*pdn) {
1367                 ldb_module_oom(module);
1368                 return LDB_ERR_OPERATIONS_ERROR;
1369         }
1370
1371         for (i=0; i<el->num_values; i++) {
1372                 struct ldb_val *v = &el->values[i];
1373                 NTSTATUS status;
1374                 struct ldb_dn *dn;
1375                 struct parsed_dn *p;
1376
1377                 p = &(*pdn)[i];
1378
1379                 p->dsdb_dn = dsdb_dn_parse(*pdn, ldb, v, ldap_oid);
1380                 if (p->dsdb_dn == NULL) {
1381                         return LDB_ERR_INVALID_DN_SYNTAX;
1382                 }
1383
1384                 dn = p->dsdb_dn->dn;
1385
1386                 p->guid = talloc(*pdn, struct GUID);
1387                 if (p->guid == NULL) {
1388                         ldb_module_oom(module);
1389                         return LDB_ERR_OPERATIONS_ERROR;
1390                 }
1391
1392                 status = dsdb_get_extended_dn_guid(dn, p->guid, "GUID");
1393                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1394                         /* we got a DN without a GUID - go find the GUID */
1395                         int ret = dsdb_module_guid_by_dn(module, dn, p->guid);
1396                         if (ret != LDB_SUCCESS) {
1397                                 ldb_asprintf_errstring(ldb, "Unable to find GUID for DN %s\n",
1398                                                        ldb_dn_get_linearized(dn));
1399                                 return ret;
1400                         }
1401                         ret = dsdb_set_extended_dn_guid(dn, p->guid, "GUID");
1402                         if (ret != LDB_SUCCESS) {
1403                                 return ret;
1404                         }
1405                 } else if (!NT_STATUS_IS_OK(status)) {
1406                         return LDB_ERR_OPERATIONS_ERROR;
1407                 }
1408
1409                 /* keep a pointer to the original ldb_val */
1410                 p->v = v;
1411         }
1412
1413         TYPESAFE_QSORT(*pdn, el->num_values, parsed_dn_compare);
1414
1415         return LDB_SUCCESS;
1416 }
1417
1418 /*
1419   build a new extended DN, including all meta data fields
1420
1421   RMD_FLAGS           = DSDB_RMD_FLAG_* bits
1422   RMD_ADDTIME         = originating_add_time
1423   RMD_INVOCID         = originating_invocation_id
1424   RMD_CHANGETIME      = originating_change_time
1425   RMD_ORIGINATING_USN = originating_usn
1426   RMD_LOCAL_USN       = local_usn
1427   RMD_VERSION         = version
1428  */
1429 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1430                                const struct GUID *invocation_id, uint64_t seq_num,
1431                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted)
1432 {
1433         struct ldb_dn *dn = dsdb_dn->dn;
1434         const char *tstring, *usn_string, *flags_string;
1435         struct ldb_val tval;
1436         struct ldb_val iid;
1437         struct ldb_val usnv, local_usnv;
1438         struct ldb_val vers, flagsv;
1439         NTSTATUS status;
1440         int ret;
1441         const char *dnstring;
1442         char *vstring;
1443         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1444
1445         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1446         if (!tstring) {
1447                 return LDB_ERR_OPERATIONS_ERROR;
1448         }
1449         tval = data_blob_string_const(tstring);
1450
1451         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1452         if (!usn_string) {
1453                 return LDB_ERR_OPERATIONS_ERROR;
1454         }
1455         usnv = data_blob_string_const(usn_string);
1456
1457         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1458         if (!usn_string) {
1459                 return LDB_ERR_OPERATIONS_ERROR;
1460         }
1461         local_usnv = data_blob_string_const(usn_string);
1462
1463         vstring = talloc_asprintf(mem_ctx, "%lu", (unsigned long)version);
1464         if (!vstring) {
1465                 return LDB_ERR_OPERATIONS_ERROR;
1466         }
1467         vers = data_blob_string_const(vstring);
1468
1469         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1470         if (!NT_STATUS_IS_OK(status)) {
1471                 return LDB_ERR_OPERATIONS_ERROR;
1472         }
1473
1474         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1475         if (!flags_string) {
1476                 return LDB_ERR_OPERATIONS_ERROR;
1477         }
1478         flagsv = data_blob_string_const(flags_string);
1479
1480         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1481         if (ret != LDB_SUCCESS) return ret;
1482         ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", &tval);
1483         if (ret != LDB_SUCCESS) return ret;
1484         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1485         if (ret != LDB_SUCCESS) return ret;
1486         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1487         if (ret != LDB_SUCCESS) return ret;
1488         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1489         if (ret != LDB_SUCCESS) return ret;
1490         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1491         if (ret != LDB_SUCCESS) return ret;
1492         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1493         if (ret != LDB_SUCCESS) return ret;
1494
1495         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1496         if (dnstring == NULL) {
1497                 return LDB_ERR_OPERATIONS_ERROR;
1498         }
1499         *v = data_blob_string_const(dnstring);
1500
1501         return LDB_SUCCESS;
1502 }
1503
1504 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1505                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1506                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1507                                 uint32_t version, bool deleted);
1508
1509 /*
1510   check if any links need upgrading from w2k format
1511
1512   The parent_ctx is the ldb_message_element which contains the values array that dns[i].v points at, and which should be used for allocating any new value.
1513  */
1514 static int replmd_check_upgrade_links(struct parsed_dn *dns, uint32_t count, struct ldb_message_element *parent_ctx, const struct GUID *invocation_id)
1515 {
1516         uint32_t i;
1517         for (i=0; i<count; i++) {
1518                 NTSTATUS status;
1519                 uint32_t version;
1520                 int ret;
1521
1522                 status = dsdb_get_extended_dn_uint32(dns[i].dsdb_dn->dn, &version, "RMD_VERSION");
1523                 if (!NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1524                         continue;
1525                 }
1526
1527                 /* it's an old one that needs upgrading */
1528                 ret = replmd_update_la_val(parent_ctx->values, dns[i].v, dns[i].dsdb_dn, dns[i].dsdb_dn, invocation_id,
1529                                            1, 1, 0, 0, false);
1530                 if (ret != LDB_SUCCESS) {
1531                         return ret;
1532                 }
1533         }
1534         return LDB_SUCCESS;
1535 }
1536
1537 /*
1538   update an extended DN, including all meta data fields
1539
1540   see replmd_build_la_val for value names
1541  */
1542 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1543                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1544                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1545                                 uint32_t version, bool deleted)
1546 {
1547         struct ldb_dn *dn = dsdb_dn->dn;
1548         const char *tstring, *usn_string, *flags_string;
1549         struct ldb_val tval;
1550         struct ldb_val iid;
1551         struct ldb_val usnv, local_usnv;
1552         struct ldb_val vers, flagsv;
1553         const struct ldb_val *old_addtime;
1554         uint32_t old_version;
1555         NTSTATUS status;
1556         int ret;
1557         const char *dnstring;
1558         char *vstring;
1559         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1560
1561         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1562         if (!tstring) {
1563                 return LDB_ERR_OPERATIONS_ERROR;
1564         }
1565         tval = data_blob_string_const(tstring);
1566
1567         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1568         if (!usn_string) {
1569                 return LDB_ERR_OPERATIONS_ERROR;
1570         }
1571         usnv = data_blob_string_const(usn_string);
1572
1573         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1574         if (!usn_string) {
1575                 return LDB_ERR_OPERATIONS_ERROR;
1576         }
1577         local_usnv = data_blob_string_const(usn_string);
1578
1579         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1580         if (!NT_STATUS_IS_OK(status)) {
1581                 return LDB_ERR_OPERATIONS_ERROR;
1582         }
1583
1584         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1585         if (!flags_string) {
1586                 return LDB_ERR_OPERATIONS_ERROR;
1587         }
1588         flagsv = data_blob_string_const(flags_string);
1589
1590         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1591         if (ret != LDB_SUCCESS) return ret;
1592
1593         /* get the ADDTIME from the original */
1594         old_addtime = ldb_dn_get_extended_component(old_dsdb_dn->dn, "RMD_ADDTIME");
1595         if (old_addtime == NULL) {
1596                 old_addtime = &tval;
1597         }
1598         if (dsdb_dn != old_dsdb_dn) {
1599                 ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", old_addtime);
1600                 if (ret != LDB_SUCCESS) return ret;
1601         }
1602
1603         /* use our invocation id */
1604         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1605         if (ret != LDB_SUCCESS) return ret;
1606
1607         /* changetime is the current time */
1608         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1609         if (ret != LDB_SUCCESS) return ret;
1610
1611         /* update the USN */
1612         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1613         if (ret != LDB_SUCCESS) return ret;
1614
1615         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1616         if (ret != LDB_SUCCESS) return ret;
1617
1618         /* increase the version by 1 */
1619         status = dsdb_get_extended_dn_uint32(old_dsdb_dn->dn, &old_version, "RMD_VERSION");
1620         if (NT_STATUS_IS_OK(status) && old_version >= version) {
1621                 version = old_version+1;
1622         }
1623         vstring = talloc_asprintf(dn, "%lu", (unsigned long)version);
1624         vers = data_blob_string_const(vstring);
1625         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1626         if (ret != LDB_SUCCESS) return ret;
1627
1628         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1629         if (dnstring == NULL) {
1630                 return LDB_ERR_OPERATIONS_ERROR;
1631         }
1632         *v = data_blob_string_const(dnstring);
1633
1634         return LDB_SUCCESS;
1635 }
1636
1637 /*
1638   handle adding a linked attribute
1639  */
1640 static int replmd_modify_la_add(struct ldb_module *module,
1641                                 const struct dsdb_schema *schema,
1642                                 struct ldb_message *msg,
1643                                 struct ldb_message_element *el,
1644                                 struct ldb_message_element *old_el,
1645                                 const struct dsdb_attribute *schema_attr,
1646                                 uint64_t seq_num,
1647                                 time_t t,
1648                                 struct GUID *msg_guid)
1649 {
1650         unsigned int i;
1651         struct parsed_dn *dns, *old_dns;
1652         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1653         int ret;
1654         struct ldb_val *new_values = NULL;
1655         unsigned int num_new_values = 0;
1656         unsigned old_num_values = old_el?old_el->num_values:0;
1657         const struct GUID *invocation_id;
1658         struct ldb_context *ldb = ldb_module_get_ctx(module);
1659         NTTIME now;
1660
1661         unix_to_nt_time(&now, t);
1662
1663         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1664         if (ret != LDB_SUCCESS) {
1665                 talloc_free(tmp_ctx);
1666                 return ret;
1667         }
1668
1669         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1670         if (ret != LDB_SUCCESS) {
1671                 talloc_free(tmp_ctx);
1672                 return ret;
1673         }
1674
1675         invocation_id = samdb_ntds_invocation_id(ldb);
1676         if (!invocation_id) {
1677                 talloc_free(tmp_ctx);
1678                 return LDB_ERR_OPERATIONS_ERROR;
1679         }
1680
1681         ret = replmd_check_upgrade_links(old_dns, old_num_values, old_el, invocation_id);
1682         if (ret != LDB_SUCCESS) {
1683                 talloc_free(tmp_ctx);
1684                 return ret;
1685         }
1686
1687         /* for each new value, see if it exists already with the same GUID */
1688         for (i=0; i<el->num_values; i++) {
1689                 struct parsed_dn *p = parsed_dn_find(old_dns, old_num_values, dns[i].guid, NULL);
1690                 if (p == NULL) {
1691                         /* this is a new linked attribute value */
1692                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val, num_new_values+1);
1693                         if (new_values == NULL) {
1694                                 ldb_module_oom(module);
1695                                 talloc_free(tmp_ctx);
1696                                 return LDB_ERR_OPERATIONS_ERROR;
1697                         }
1698                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1699                                                   invocation_id, seq_num, seq_num, now, 0, false);
1700                         if (ret != LDB_SUCCESS) {
1701                                 talloc_free(tmp_ctx);
1702                                 return ret;
1703                         }
1704                         num_new_values++;
1705                 } else {
1706                         /* this is only allowed if the GUID was
1707                            previously deleted. */
1708                         uint32_t rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1709
1710                         if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
1711                                 ldb_asprintf_errstring(ldb, "Attribute %s already exists for target GUID %s",
1712                                                        el->name, GUID_string(tmp_ctx, p->guid));
1713                                 talloc_free(tmp_ctx);
1714                                 return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
1715                         }
1716                         ret = replmd_update_la_val(old_el->values, p->v, dns[i].dsdb_dn, p->dsdb_dn,
1717                                                    invocation_id, seq_num, seq_num, now, 0, false);
1718                         if (ret != LDB_SUCCESS) {
1719                                 talloc_free(tmp_ctx);
1720                                 return ret;
1721                         }
1722                 }
1723
1724                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, true);
1725                 if (ret != LDB_SUCCESS) {
1726                         talloc_free(tmp_ctx);
1727                         return ret;
1728                 }
1729         }
1730
1731         /* add the new ones on to the end of the old values, constructing a new el->values */
1732         el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1733                                     struct ldb_val,
1734                                     old_num_values+num_new_values);
1735         if (el->values == NULL) {
1736                 ldb_module_oom(module);
1737                 return LDB_ERR_OPERATIONS_ERROR;
1738         }
1739
1740         memcpy(&el->values[old_num_values], new_values, num_new_values*sizeof(struct ldb_val));
1741         el->num_values = old_num_values + num_new_values;
1742
1743         talloc_steal(msg->elements, el->values);
1744         talloc_steal(el->values, new_values);
1745
1746         talloc_free(tmp_ctx);
1747
1748         /* we now tell the backend to replace all existing values
1749            with the one we have constructed */
1750         el->flags = LDB_FLAG_MOD_REPLACE;
1751
1752         return LDB_SUCCESS;
1753 }
1754
1755
1756 /*
1757   handle deleting all active linked attributes
1758  */
1759 static int replmd_modify_la_delete(struct ldb_module *module,
1760                                    const struct dsdb_schema *schema,
1761                                    struct ldb_message *msg,
1762                                    struct ldb_message_element *el,
1763                                    struct ldb_message_element *old_el,
1764                                    const struct dsdb_attribute *schema_attr,
1765                                    uint64_t seq_num,
1766                                    time_t t,
1767                                    struct GUID *msg_guid)
1768 {
1769         unsigned int i;
1770         struct parsed_dn *dns, *old_dns;
1771         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1772         int ret;
1773         const struct GUID *invocation_id;
1774         struct ldb_context *ldb = ldb_module_get_ctx(module);
1775         NTTIME now;
1776
1777         unix_to_nt_time(&now, t);
1778
1779         /* check if there is nothing to delete */
1780         if ((!old_el || old_el->num_values == 0) &&
1781             el->num_values == 0) {
1782                 return LDB_SUCCESS;
1783         }
1784
1785         if (!old_el || old_el->num_values == 0) {
1786                 return LDB_ERR_NO_SUCH_ATTRIBUTE;
1787         }
1788
1789         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1790         if (ret != LDB_SUCCESS) {
1791                 talloc_free(tmp_ctx);
1792                 return ret;
1793         }
1794
1795         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1796         if (ret != LDB_SUCCESS) {
1797                 talloc_free(tmp_ctx);
1798                 return ret;
1799         }
1800
1801         invocation_id = samdb_ntds_invocation_id(ldb);
1802         if (!invocation_id) {
1803                 return LDB_ERR_OPERATIONS_ERROR;
1804         }
1805
1806         ret = replmd_check_upgrade_links(old_dns, old_el->num_values, old_el, invocation_id);
1807         if (ret != LDB_SUCCESS) {
1808                 talloc_free(tmp_ctx);
1809                 return ret;
1810         }
1811
1812         el->values = NULL;
1813
1814         /* see if we are being asked to delete any links that
1815            don't exist or are already deleted */
1816         for (i=0; i<el->num_values; i++) {
1817                 struct parsed_dn *p = &dns[i];
1818                 struct parsed_dn *p2;
1819                 uint32_t rmd_flags;
1820
1821                 p2 = parsed_dn_find(old_dns, old_el->num_values, p->guid, NULL);
1822                 if (!p2) {
1823                         ldb_asprintf_errstring(ldb, "Attribute %s doesn't exist for target GUID %s",
1824                                                el->name, GUID_string(tmp_ctx, p->guid));
1825                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1826                 }
1827                 rmd_flags = dsdb_dn_rmd_flags(p2->dsdb_dn->dn);
1828                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) {
1829                         ldb_asprintf_errstring(ldb, "Attribute %s already deleted for target GUID %s",
1830                                                el->name, GUID_string(tmp_ctx, p->guid));
1831                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1832                 }
1833         }
1834
1835         /* for each new value, see if it exists already with the same GUID
1836            if it is not already deleted and matches the delete list then delete it
1837         */
1838         for (i=0; i<old_el->num_values; i++) {
1839                 struct parsed_dn *p = &old_dns[i];
1840                 uint32_t rmd_flags;
1841
1842                 if (el->num_values && parsed_dn_find(dns, el->num_values, p->guid, NULL) == NULL) {
1843                         continue;
1844                 }
1845
1846                 rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1847                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1848
1849                 ret = replmd_update_la_val(old_el->values, p->v, p->dsdb_dn, p->dsdb_dn,
1850                                            invocation_id, seq_num, seq_num, now, 0, true);
1851                 if (ret != LDB_SUCCESS) {
1852                         talloc_free(tmp_ctx);
1853                         return ret;
1854                 }
1855
1856                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, true);
1857                 if (ret != LDB_SUCCESS) {
1858                         talloc_free(tmp_ctx);
1859                         return ret;
1860                 }
1861         }
1862
1863         el->values = talloc_steal(msg->elements, old_el->values);
1864         el->num_values = old_el->num_values;
1865
1866         talloc_free(tmp_ctx);
1867
1868         /* we now tell the backend to replace all existing values
1869            with the one we have constructed */
1870         el->flags = LDB_FLAG_MOD_REPLACE;
1871
1872         return LDB_SUCCESS;
1873 }
1874
1875 /*
1876   handle replacing a linked attribute
1877  */
1878 static int replmd_modify_la_replace(struct ldb_module *module,
1879                                     const struct dsdb_schema *schema,
1880                                     struct ldb_message *msg,
1881                                     struct ldb_message_element *el,
1882                                     struct ldb_message_element *old_el,
1883                                     const struct dsdb_attribute *schema_attr,
1884                                     uint64_t seq_num,
1885                                     time_t t,
1886                                     struct GUID *msg_guid)
1887 {
1888         unsigned int i;
1889         struct parsed_dn *dns, *old_dns;
1890         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1891         int ret;
1892         const struct GUID *invocation_id;
1893         struct ldb_context *ldb = ldb_module_get_ctx(module);
1894         struct ldb_val *new_values = NULL;
1895         unsigned int num_new_values = 0;
1896         unsigned int old_num_values = old_el?old_el->num_values:0;
1897         NTTIME now;
1898
1899         unix_to_nt_time(&now, t);
1900
1901         /* check if there is nothing to replace */
1902         if ((!old_el || old_el->num_values == 0) &&
1903             el->num_values == 0) {
1904                 return LDB_SUCCESS;
1905         }
1906
1907         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1908         if (ret != LDB_SUCCESS) {
1909                 talloc_free(tmp_ctx);
1910                 return ret;
1911         }
1912
1913         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1914         if (ret != LDB_SUCCESS) {
1915                 talloc_free(tmp_ctx);
1916                 return ret;
1917         }
1918
1919         invocation_id = samdb_ntds_invocation_id(ldb);
1920         if (!invocation_id) {
1921                 return LDB_ERR_OPERATIONS_ERROR;
1922         }
1923
1924         ret = replmd_check_upgrade_links(old_dns, old_num_values, old_el, invocation_id);
1925         if (ret != LDB_SUCCESS) {
1926                 talloc_free(tmp_ctx);
1927                 return ret;
1928         }
1929
1930         /* mark all the old ones as deleted */
1931         for (i=0; i<old_num_values; i++) {
1932                 struct parsed_dn *old_p = &old_dns[i];
1933                 struct parsed_dn *p;
1934                 uint32_t rmd_flags = dsdb_dn_rmd_flags(old_p->dsdb_dn->dn);
1935
1936                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1937
1938                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, false);
1939                 if (ret != LDB_SUCCESS) {
1940                         talloc_free(tmp_ctx);
1941                         return ret;
1942                 }
1943
1944                 p = parsed_dn_find(dns, el->num_values, old_p->guid, NULL);
1945                 if (p) {
1946                         /* we don't delete it if we are re-adding it */
1947                         continue;
1948                 }
1949
1950                 ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn, old_p->dsdb_dn,
1951                                            invocation_id, seq_num, seq_num, now, 0, true);
1952                 if (ret != LDB_SUCCESS) {
1953                         talloc_free(tmp_ctx);
1954                         return ret;
1955                 }
1956         }
1957
1958         /* for each new value, either update its meta-data, or add it
1959          * to old_el
1960         */
1961         for (i=0; i<el->num_values; i++) {
1962                 struct parsed_dn *p = &dns[i], *old_p;
1963
1964                 if (old_dns &&
1965                     (old_p = parsed_dn_find(old_dns,
1966                                             old_num_values, p->guid, NULL)) != NULL) {
1967                         /* update in place */
1968                         ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn,
1969                                                    old_p->dsdb_dn, invocation_id,
1970                                                    seq_num, seq_num, now, 0, false);
1971                         if (ret != LDB_SUCCESS) {
1972                                 talloc_free(tmp_ctx);
1973                                 return ret;
1974                         }
1975                 } else {
1976                         /* add a new one */
1977                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val,
1978                                                     num_new_values+1);
1979                         if (new_values == NULL) {
1980                                 ldb_module_oom(module);
1981                                 talloc_free(tmp_ctx);
1982                                 return LDB_ERR_OPERATIONS_ERROR;
1983                         }
1984                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1985                                                   invocation_id, seq_num, seq_num, now, 0, false);
1986                         if (ret != LDB_SUCCESS) {
1987                                 talloc_free(tmp_ctx);
1988                                 return ret;
1989                         }
1990                         num_new_values++;
1991                 }
1992
1993                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, false);
1994                 if (ret != LDB_SUCCESS) {
1995                         talloc_free(tmp_ctx);
1996                         return ret;
1997                 }
1998         }
1999
2000         /* add the new values to the end of old_el */
2001         if (num_new_values != 0) {
2002                 el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
2003                                             struct ldb_val, old_num_values+num_new_values);
2004                 if (el->values == NULL) {
2005                         ldb_module_oom(module);
2006                         return LDB_ERR_OPERATIONS_ERROR;
2007                 }
2008                 memcpy(&el->values[old_num_values], &new_values[0],
2009                        sizeof(struct ldb_val)*num_new_values);
2010                 el->num_values = old_num_values + num_new_values;
2011                 talloc_steal(msg->elements, new_values);
2012         } else {
2013                 el->values = old_el->values;
2014                 el->num_values = old_el->num_values;
2015                 talloc_steal(msg->elements, el->values);
2016         }
2017
2018         talloc_free(tmp_ctx);
2019
2020         /* we now tell the backend to replace all existing values
2021            with the one we have constructed */
2022         el->flags = LDB_FLAG_MOD_REPLACE;
2023
2024         return LDB_SUCCESS;
2025 }
2026
2027
2028 /*
2029   handle linked attributes in modify requests
2030  */
2031 static int replmd_modify_handle_linked_attribs(struct ldb_module *module,
2032                                                struct ldb_message *msg,
2033                                                uint64_t seq_num, time_t t)
2034 {
2035         struct ldb_result *res;
2036         unsigned int i;
2037         int ret;
2038         struct ldb_context *ldb = ldb_module_get_ctx(module);
2039         struct ldb_message *old_msg;
2040
2041         const struct dsdb_schema *schema;
2042         struct GUID old_guid;
2043
2044         if (seq_num == 0) {
2045                 /* there the replmd_update_rpmd code has already
2046                  * checked and saw that there are no linked
2047                  * attributes */
2048                 return LDB_SUCCESS;
2049         }
2050
2051         if (dsdb_functional_level(ldb) == DS_DOMAIN_FUNCTION_2000) {
2052                 /* don't do anything special for linked attributes */
2053                 return LDB_SUCCESS;
2054         }
2055
2056         ret = dsdb_module_search_dn(module, msg, &res, msg->dn, NULL,
2057                                     DSDB_FLAG_NEXT_MODULE |
2058                                     DSDB_SEARCH_SHOW_DELETED |
2059                                     DSDB_SEARCH_REVEAL_INTERNALS |
2060                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
2061         if (ret != LDB_SUCCESS) {
2062                 return ret;
2063         }
2064         schema = dsdb_get_schema(ldb, res);
2065         if (!schema) {
2066                 return LDB_ERR_OPERATIONS_ERROR;
2067         }
2068
2069         old_msg = res->msgs[0];
2070
2071         old_guid = samdb_result_guid(old_msg, "objectGUID");
2072
2073         for (i=0; i<msg->num_elements; i++) {
2074                 struct ldb_message_element *el = &msg->elements[i];
2075                 struct ldb_message_element *old_el, *new_el;
2076                 const struct dsdb_attribute *schema_attr
2077                         = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
2078                 if (!schema_attr) {
2079                         ldb_asprintf_errstring(ldb,
2080                                                "attribute %s is not a valid attribute in schema", el->name);
2081                         return LDB_ERR_OBJECT_CLASS_VIOLATION;
2082                 }
2083                 if (schema_attr->linkID == 0) {
2084                         continue;
2085                 }
2086                 if ((schema_attr->linkID & 1) == 1) {
2087                         /* Odd is for the target.  Illegal to modify */
2088                         ldb_asprintf_errstring(ldb,
2089                                                "attribute %s must not be modified directly, it is a linked attribute", el->name);
2090                         return LDB_ERR_UNWILLING_TO_PERFORM;
2091                 }
2092                 old_el = ldb_msg_find_element(old_msg, el->name);
2093                 switch (el->flags & LDB_FLAG_MOD_MASK) {
2094                 case LDB_FLAG_MOD_REPLACE:
2095                         ret = replmd_modify_la_replace(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
2096                         break;
2097                 case LDB_FLAG_MOD_DELETE:
2098                         ret = replmd_modify_la_delete(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
2099                         break;
2100                 case LDB_FLAG_MOD_ADD:
2101                         ret = replmd_modify_la_add(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
2102                         break;
2103                 default:
2104                         ldb_asprintf_errstring(ldb,
2105                                                "invalid flags 0x%x for %s linked attribute",
2106                                                el->flags, el->name);
2107                         return LDB_ERR_UNWILLING_TO_PERFORM;
2108                 }
2109                 if (ret != LDB_SUCCESS) {
2110                         return ret;
2111                 }
2112                 if (old_el) {
2113                         ldb_msg_remove_attr(old_msg, el->name);
2114                 }
2115                 ldb_msg_add_empty(old_msg, el->name, 0, &new_el);
2116                 new_el->num_values = el->num_values;
2117                 new_el->values = talloc_steal(msg->elements, el->values);
2118
2119                 /* TODO: this relises a bit too heavily on the exact
2120                    behaviour of ldb_msg_find_element and
2121                    ldb_msg_remove_element */
2122                 old_el = ldb_msg_find_element(msg, el->name);
2123                 if (old_el != el) {
2124                         ldb_msg_remove_element(msg, old_el);
2125                         i--;
2126                 }
2127         }
2128
2129         talloc_free(res);
2130         return ret;
2131 }
2132
2133
2134
2135 static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
2136 {
2137         struct ldb_context *ldb;
2138         struct replmd_replicated_request *ac;
2139         struct ldb_request *down_req;
2140         struct ldb_message *msg;
2141         time_t t = time(NULL);
2142         int ret;
2143         bool is_urgent = false;
2144         struct loadparm_context *lp_ctx;
2145         char *referral;
2146         unsigned int functional_level;
2147
2148         /* do not manipulate our control entries */
2149         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2150                 return ldb_next_request(module, req);
2151         }
2152
2153         ldb = ldb_module_get_ctx(module);
2154         functional_level = dsdb_functional_level(ldb);
2155
2156         lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
2157                                  struct loadparm_context);
2158
2159         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_modify\n");
2160
2161         ac = replmd_ctx_init(module, req);
2162         if (!ac) {
2163                 return LDB_ERR_OPERATIONS_ERROR;
2164         }
2165
2166         /* we have to copy the message as the caller might have it as a const */
2167         msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
2168         if (msg == NULL) {
2169                 ldb_oom(ldb);
2170                 talloc_free(ac);
2171                 return LDB_ERR_OPERATIONS_ERROR;
2172         }
2173
2174         ldb_msg_remove_attr(msg, "whenChanged");
2175         ldb_msg_remove_attr(msg, "uSNChanged");
2176
2177         ret = replmd_update_rpmd(module, ac->schema, req, msg, &ac->seq_num, t, &is_urgent);
2178         if (ret == LDB_ERR_REFERRAL) {
2179                 referral = talloc_asprintf(req,
2180                                            "ldap://%s/%s",
2181                                            lpcfg_dnsdomain(lp_ctx),
2182                                            ldb_dn_get_linearized(msg->dn));
2183                 ret = ldb_module_send_referral(req, referral);
2184                 talloc_free(ac);
2185                 return ldb_module_done(req, NULL, NULL, ret);
2186         }
2187
2188         if (ret != LDB_SUCCESS) {
2189                 talloc_free(ac);
2190                 return ret;
2191         }
2192
2193         ret = replmd_modify_handle_linked_attribs(module, msg, ac->seq_num, t);
2194         if (ret != LDB_SUCCESS) {
2195                 talloc_free(ac);
2196                 return ret;
2197         }
2198
2199         /* TODO:
2200          * - replace the old object with the newly constructed one
2201          */
2202
2203         ac->is_urgent = is_urgent;
2204
2205         ret = ldb_build_mod_req(&down_req, ldb, ac,
2206                                 msg,
2207                                 req->controls,
2208                                 ac, replmd_op_callback,
2209                                 req);
2210         if (ret != LDB_SUCCESS) {
2211                 talloc_free(ac);
2212                 return ret;
2213         }
2214
2215         /* If we are in functional level 2000, then
2216          * replmd_modify_handle_linked_attribs will have done
2217          * nothing */
2218         if (functional_level == DS_DOMAIN_FUNCTION_2000) {
2219                 ret = ldb_request_add_control(down_req, DSDB_CONTROL_APPLY_LINKS, false, NULL);
2220                 if (ret != LDB_SUCCESS) {
2221                         talloc_free(ac);
2222                         return ret;
2223                 }
2224         }
2225
2226         talloc_steal(down_req, msg);
2227
2228         /* we only change whenChanged and uSNChanged if the seq_num
2229            has changed */
2230         if (ac->seq_num != 0) {
2231                 if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
2232                         talloc_free(ac);
2233                         return ret;
2234                 }
2235
2236                 if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
2237                         talloc_free(ac);
2238                         return ret;
2239                 }
2240         }
2241
2242         /* go on with the call chain */
2243         return ldb_next_request(module, down_req);
2244 }
2245
2246 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares);
2247
2248 /*
2249   handle a rename request
2250
2251   On a rename we need to do an extra ldb_modify which sets the
2252   whenChanged and uSNChanged attributes.  We do this in a callback after the success.
2253  */
2254 static int replmd_rename(struct ldb_module *module, struct ldb_request *req)
2255 {
2256         struct ldb_context *ldb;
2257         struct replmd_replicated_request *ac;
2258         int ret;
2259         struct ldb_request *down_req;
2260
2261         /* do not manipulate our control entries */
2262         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2263                 return ldb_next_request(module, req);
2264         }
2265
2266         ldb = ldb_module_get_ctx(module);
2267
2268         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_rename\n");
2269
2270         ac = replmd_ctx_init(module, req);
2271         if (!ac) {
2272                 return LDB_ERR_OPERATIONS_ERROR;
2273         }
2274         ret = ldb_build_rename_req(&down_req, ldb, ac,
2275                                    ac->req->op.rename.olddn,
2276                                    ac->req->op.rename.newdn,
2277                                    ac->req->controls,
2278                                    ac, replmd_rename_callback,
2279                                    ac->req);
2280
2281         if (ret != LDB_SUCCESS) {
2282                 talloc_free(ac);
2283                 return ret;
2284         }
2285
2286         /* go on with the call chain */
2287         return ldb_next_request(module, down_req);
2288 }
2289
2290 /* After the rename is compleated, update the whenchanged etc */
2291 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares)
2292 {
2293         struct ldb_context *ldb;
2294         struct replmd_replicated_request *ac;
2295         struct ldb_request *down_req;
2296         struct ldb_message *msg;
2297         time_t t = time(NULL);
2298         int ret;
2299
2300         ac = talloc_get_type(req->context, struct replmd_replicated_request);
2301         ldb = ldb_module_get_ctx(ac->module);
2302
2303         if (ares->error != LDB_SUCCESS) {
2304                 return ldb_module_done(ac->req, ares->controls,
2305                                         ares->response, ares->error);
2306         }
2307
2308         if (ares->type != LDB_REPLY_DONE) {
2309                 ldb_set_errstring(ldb,
2310                                   "invalid ldb_reply_type in callback");
2311                 talloc_free(ares);
2312                 return ldb_module_done(ac->req, NULL, NULL,
2313                                         LDB_ERR_OPERATIONS_ERROR);
2314         }
2315
2316         /* Get a sequence number from the backend */
2317         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
2318         if (ret != LDB_SUCCESS) {
2319                 return ret;
2320         }
2321
2322         /* TODO:
2323          * - replace the old object with the newly constructed one
2324          */
2325
2326         msg = ldb_msg_new(ac);
2327         if (msg == NULL) {
2328                 ldb_oom(ldb);
2329                 return LDB_ERR_OPERATIONS_ERROR;
2330         }
2331
2332         msg->dn = ac->req->op.rename.newdn;
2333
2334         ret = ldb_build_mod_req(&down_req, ldb, ac,
2335                                 msg,
2336                                 req->controls,
2337                                 ac, replmd_op_callback,
2338                                 req);
2339
2340         if (ret != LDB_SUCCESS) {
2341                 talloc_free(ac);
2342                 return ret;
2343         }
2344         talloc_steal(down_req, msg);
2345
2346         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
2347                 talloc_free(ac);
2348                 return ret;
2349         }
2350
2351         if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
2352                 talloc_free(ac);
2353                 return ret;
2354         }
2355
2356         /* go on with the call chain - do the modify after the rename */
2357         return ldb_next_request(ac->module, down_req);
2358 }
2359
2360 /*
2361    remove links from objects that point at this object when an object
2362    is deleted
2363  */
2364 static int replmd_delete_remove_link(struct ldb_module *module,
2365                                      const struct dsdb_schema *schema,
2366                                      struct ldb_dn *dn,
2367                                      struct ldb_message_element *el,
2368                                      const struct dsdb_attribute *sa)
2369 {
2370         unsigned int i;
2371         TALLOC_CTX *tmp_ctx = talloc_new(module);
2372         struct ldb_context *ldb = ldb_module_get_ctx(module);
2373
2374         for (i=0; i<el->num_values; i++) {
2375                 struct dsdb_dn *dsdb_dn;
2376                 NTSTATUS status;
2377                 int ret;
2378                 struct GUID guid2;
2379                 struct ldb_message *msg;
2380                 const struct dsdb_attribute *target_attr;
2381                 struct ldb_message_element *el2;
2382                 struct ldb_val dn_val;
2383
2384                 if (dsdb_dn_is_deleted_val(&el->values[i])) {
2385                         continue;
2386                 }
2387
2388                 dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &el->values[i], sa->syntax->ldap_oid);
2389                 if (!dsdb_dn) {
2390                         talloc_free(tmp_ctx);
2391                         return LDB_ERR_OPERATIONS_ERROR;
2392                 }
2393
2394                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid2, "GUID");
2395                 if (!NT_STATUS_IS_OK(status)) {
2396                         talloc_free(tmp_ctx);
2397                         return LDB_ERR_OPERATIONS_ERROR;
2398                 }
2399
2400                 /* remove the link */
2401                 msg = ldb_msg_new(tmp_ctx);
2402                 if (!msg) {
2403                         ldb_module_oom(module);
2404                         talloc_free(tmp_ctx);
2405                         return LDB_ERR_OPERATIONS_ERROR;
2406                 }
2407
2408
2409                 msg->dn = dsdb_dn->dn;
2410
2411                 target_attr = dsdb_attribute_by_linkID(schema, sa->linkID ^ 1);
2412                 if (target_attr == NULL) {
2413                         continue;
2414                 }
2415
2416                 ret = ldb_msg_add_empty(msg, target_attr->lDAPDisplayName, LDB_FLAG_MOD_DELETE, &el2);
2417                 if (ret != LDB_SUCCESS) {
2418                         ldb_module_oom(module);
2419                         talloc_free(tmp_ctx);
2420                         return LDB_ERR_OPERATIONS_ERROR;
2421                 }
2422                 dn_val = data_blob_string_const(ldb_dn_get_linearized(dn));
2423                 el2->values = &dn_val;
2424                 el2->num_values = 1;
2425
2426                 ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE);
2427                 if (ret != LDB_SUCCESS) {
2428                         talloc_free(tmp_ctx);
2429                         return ret;
2430                 }
2431         }
2432         talloc_free(tmp_ctx);
2433         return LDB_SUCCESS;
2434 }
2435
2436
2437 /*
2438   handle update of replication meta data for deletion of objects
2439
2440   This also handles the mapping of delete to a rename operation
2441   to allow deletes to be replicated.
2442  */
2443 static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
2444 {
2445         int ret = LDB_ERR_OTHER;
2446         bool retb;
2447         struct ldb_dn *old_dn, *new_dn;
2448         const char *rdn_name;
2449         const struct ldb_val *rdn_value, *new_rdn_value;
2450         struct GUID guid;
2451         struct ldb_context *ldb = ldb_module_get_ctx(module);
2452         const struct dsdb_schema *schema;
2453         struct ldb_message *msg, *old_msg;
2454         struct ldb_message_element *el;
2455         TALLOC_CTX *tmp_ctx;
2456         struct ldb_result *res, *parent_res;
2457         const char *preserved_attrs[] = {
2458                 /* yes, this really is a hard coded list. See MS-ADTS
2459                    section 3.1.1.5.5.1.1 */
2460                 "nTSecurityDescriptor", "attributeID", "attributeSyntax", "dNReferenceUpdate", "dNSHostName",
2461                 "flatName", "governsID", "groupType", "instanceType", "lDAPDisplayName", "legacyExchangeDN",
2462                 "isDeleted", "isRecycled", "lastKnownParent", "msDS-LastKnownRDN", "mS-DS-CreatorSID",
2463                 "mSMQOwnerID", "nCName", "objectClass", "distinguishedName", "objectGUID", "objectSid",
2464                 "oMSyntax", "proxiedObjectName", "name", "replPropertyMetaData", "sAMAccountName",
2465                 "securityIdentifier", "sIDHistory", "subClassOf", "systemFlags", "trustPartner", "trustDirection",
2466                 "trustType", "trustAttributes", "userAccountControl", "uSNChanged", "uSNCreated", "whenCreated",
2467                 "whenChanged", NULL};
2468         unsigned int i, el_count = 0;
2469         enum deletion_state { OBJECT_NOT_DELETED=1, OBJECT_DELETED=2, OBJECT_RECYCLED=3,
2470                                                 OBJECT_TOMBSTONE=4, OBJECT_REMOVED=5 };
2471         enum deletion_state deletion_state, next_deletion_state;
2472         bool enabled;
2473
2474         if (ldb_dn_is_special(req->op.del.dn)) {
2475                 return ldb_next_request(module, req);
2476         }
2477
2478         tmp_ctx = talloc_new(ldb);
2479         if (!tmp_ctx) {
2480                 ldb_oom(ldb);
2481                 return LDB_ERR_OPERATIONS_ERROR;
2482         }
2483
2484         schema = dsdb_get_schema(ldb, tmp_ctx);
2485         if (!schema) {
2486                 return LDB_ERR_OPERATIONS_ERROR;
2487         }
2488
2489         old_dn = ldb_dn_copy(tmp_ctx, req->op.del.dn);
2490
2491         /* we need the complete msg off disk, so we can work out which
2492            attributes need to be removed */
2493         ret = dsdb_module_search_dn(module, tmp_ctx, &res, old_dn, NULL,
2494                                     DSDB_FLAG_NEXT_MODULE |
2495                                     DSDB_SEARCH_SHOW_DELETED |
2496                                     DSDB_SEARCH_REVEAL_INTERNALS |
2497                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
2498         if (ret != LDB_SUCCESS) {
2499                 talloc_free(tmp_ctx);
2500                 return ret;
2501         }
2502         old_msg = res->msgs[0];
2503
2504
2505         ret = dsdb_recyclebin_enabled(module, &enabled);
2506         if (ret != LDB_SUCCESS) {
2507                 talloc_free(tmp_ctx);
2508                 return ret;
2509         }
2510
2511         if (ldb_msg_check_string_attribute(old_msg, "isDeleted", "TRUE")) {
2512                 if (!enabled) {
2513                         deletion_state = OBJECT_TOMBSTONE;
2514                         next_deletion_state = OBJECT_REMOVED;
2515                 } else if (ldb_msg_check_string_attribute(old_msg, "isRecycled", "TRUE")) {
2516                         deletion_state = OBJECT_RECYCLED;
2517                         next_deletion_state = OBJECT_REMOVED;
2518                 } else {
2519                         deletion_state = OBJECT_DELETED;
2520                         next_deletion_state = OBJECT_RECYCLED;
2521                 }
2522         } else {
2523                 deletion_state = OBJECT_NOT_DELETED;
2524                 if (enabled) {
2525                         next_deletion_state = OBJECT_DELETED;
2526                 } else {
2527                         next_deletion_state = OBJECT_TOMBSTONE;
2528                 }
2529         }
2530
2531         if (next_deletion_state == OBJECT_REMOVED) {
2532                 struct auth_session_info *session_info =
2533                                 (struct auth_session_info *)ldb_get_opaque(ldb, "sessionInfo");
2534                 if (security_session_user_level(session_info, NULL) != SECURITY_SYSTEM) {
2535                         ldb_asprintf_errstring(ldb, "Refusing to delete deleted object %s",
2536                                         ldb_dn_get_linearized(old_msg->dn));
2537                         return LDB_ERR_UNWILLING_TO_PERFORM;
2538                 }
2539
2540                 /* it is already deleted - really remove it this time */
2541                 talloc_free(tmp_ctx);
2542                 return ldb_next_request(module, req);
2543         }
2544
2545         rdn_name = ldb_dn_get_rdn_name(old_dn);
2546         rdn_value = ldb_dn_get_rdn_val(old_dn);
2547
2548         msg = ldb_msg_new(tmp_ctx);
2549         if (msg == NULL) {
2550                 ldb_module_oom(module);
2551                 talloc_free(tmp_ctx);
2552                 return LDB_ERR_OPERATIONS_ERROR;
2553         }
2554
2555         msg->dn = old_dn;
2556
2557         if (deletion_state == OBJECT_NOT_DELETED){
2558                 /* work out where we will be renaming this object to */
2559                 ret = dsdb_get_deleted_objects_dn(ldb, tmp_ctx, old_dn, &new_dn);
2560                 if (ret != LDB_SUCCESS) {
2561                         /* this is probably an attempted delete on a partition
2562                          * that doesn't allow delete operations, such as the
2563                          * schema partition */
2564                         ldb_asprintf_errstring(ldb, "No Deleted Objects container for DN %s",
2565                                                    ldb_dn_get_linearized(old_dn));
2566                         talloc_free(tmp_ctx);
2567                         return LDB_ERR_UNWILLING_TO_PERFORM;
2568                 }
2569
2570                 /* get the objects GUID from the search we just did */
2571                 guid = samdb_result_guid(old_msg, "objectGUID");
2572
2573                 /* Add a formatted child */
2574                 retb = ldb_dn_add_child_fmt(new_dn, "%s=%s\\0ADEL:%s",
2575                                                 rdn_name,
2576                                                 rdn_value->data,
2577                                                 GUID_string(tmp_ctx, &guid));
2578                 if (!retb) {
2579                         DEBUG(0,(__location__ ": Unable to add a formatted child to dn: %s",
2580                                         ldb_dn_get_linearized(new_dn)));
2581                         talloc_free(tmp_ctx);
2582                         return LDB_ERR_OPERATIONS_ERROR;
2583                 }
2584
2585                 ret = ldb_msg_add_string(msg, "isDeleted", "TRUE");
2586                 if (ret != LDB_SUCCESS) {
2587                         DEBUG(0,(__location__ ": Failed to add isDeleted string to the msg\n"));
2588                         ldb_module_oom(module);
2589                         talloc_free(tmp_ctx);
2590                         return ret;
2591                 }
2592                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2593         }
2594
2595         /*
2596           now we need to modify the object in the following ways:
2597
2598           - add isDeleted=TRUE
2599           - update rDN and name, with new rDN
2600           - remove linked attributes
2601           - remove objectCategory and sAMAccountType
2602           - remove attribs not on the preserved list
2603              - preserved if in above list, or is rDN
2604           - remove all linked attribs from this object
2605           - remove all links from other objects to this object
2606           - add lastKnownParent
2607           - update replPropertyMetaData?
2608
2609           see MS-ADTS "Tombstone Requirements" section 3.1.1.5.5.1.1
2610          */
2611
2612         /* we need the storage form of the parent GUID */
2613         ret = dsdb_module_search_dn(module, tmp_ctx, &parent_res,
2614                                     ldb_dn_get_parent(tmp_ctx, old_dn), NULL,
2615                                     DSDB_FLAG_NEXT_MODULE |
2616                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
2617                                     DSDB_SEARCH_REVEAL_INTERNALS|
2618                                     DSDB_SEARCH_SHOW_DELETED);
2619         if (ret != LDB_SUCCESS) {
2620                 talloc_free(tmp_ctx);
2621                 return ret;
2622         }
2623
2624         if (deletion_state == OBJECT_NOT_DELETED){
2625                 ret = ldb_msg_add_steal_string(msg, "lastKnownParent",
2626                                                    ldb_dn_get_extended_linearized(tmp_ctx, parent_res->msgs[0]->dn, 1));
2627                 if (ret != LDB_SUCCESS) {
2628                         DEBUG(0,(__location__ ": Failed to add lastKnownParent string to the msg\n"));
2629                         ldb_module_oom(module);
2630                         talloc_free(tmp_ctx);
2631                         return ret;
2632                 }
2633                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2634         }
2635
2636         switch (next_deletion_state){
2637
2638         case OBJECT_DELETED:
2639
2640                 ret = ldb_msg_add_value(msg, "msDS-LastKnownRDN", rdn_value, NULL);
2641                 if (ret != LDB_SUCCESS) {
2642                         DEBUG(0,(__location__ ": Failed to add msDS-LastKnownRDN string to the msg\n"));
2643                         ldb_module_oom(module);
2644                         talloc_free(tmp_ctx);
2645                         return ret;
2646                 }
2647                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2648
2649                 ret = ldb_msg_add_empty(msg, "objectCategory", LDB_FLAG_MOD_DELETE, NULL);
2650                 if (ret != LDB_SUCCESS) {
2651                         talloc_free(tmp_ctx);
2652                         ldb_module_oom(module);
2653                         return ret;
2654                 }
2655
2656                 ret = ldb_msg_add_empty(msg, "sAMAccountType", LDB_FLAG_MOD_DELETE, NULL);
2657                 if (ret != LDB_SUCCESS) {
2658                         talloc_free(tmp_ctx);
2659                         ldb_module_oom(module);
2660                         return ret;
2661                 }
2662
2663                 break;
2664
2665         case OBJECT_RECYCLED:
2666         case OBJECT_TOMBSTONE:
2667
2668                 /* we also mark it as recycled, meaning this object can't be
2669                    recovered (we are stripping its attributes) */
2670                 if (dsdb_functional_level(ldb) >= DS_DOMAIN_FUNCTION_2008_R2) {
2671                         ret = ldb_msg_add_string(msg, "isRecycled", "TRUE");
2672                         if (ret != LDB_SUCCESS) {
2673                                 DEBUG(0,(__location__ ": Failed to add isRecycled string to the msg\n"));
2674                                 ldb_module_oom(module);
2675                                 talloc_free(tmp_ctx);
2676                                 return ret;
2677                         }
2678                         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2679                 }
2680
2681                 /* work out which of the old attributes we will be removing */
2682                 for (i=0; i<old_msg->num_elements; i++) {
2683                         const struct dsdb_attribute *sa;
2684                         el = &old_msg->elements[i];
2685                         sa = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
2686                         if (!sa) {
2687                                 talloc_free(tmp_ctx);
2688                                 return LDB_ERR_OPERATIONS_ERROR;
2689                         }
2690                         if (ldb_attr_cmp(el->name, rdn_name) == 0) {
2691                                 /* don't remove the rDN */
2692                                 continue;
2693                         }
2694                         if (sa->linkID && sa->linkID & 1) {
2695                                 ret = replmd_delete_remove_link(module, schema, old_dn, el, sa);
2696                                 if (ret != LDB_SUCCESS) {
2697                                         talloc_free(tmp_ctx);
2698                                         return LDB_ERR_OPERATIONS_ERROR;
2699                                 }
2700                                 continue;
2701                         }
2702                         if (!sa->linkID && ldb_attr_in_list(preserved_attrs, el->name)) {
2703                                 continue;
2704                         }
2705                         ret = ldb_msg_add_empty(msg, el->name, LDB_FLAG_MOD_DELETE, &el);
2706                         if (ret != LDB_SUCCESS) {
2707                                 talloc_free(tmp_ctx);
2708                                 ldb_module_oom(module);
2709                                 return ret;
2710                         }
2711                 }
2712                 break;
2713
2714         default:
2715                 break;
2716         }
2717
2718         if (deletion_state == OBJECT_NOT_DELETED) {
2719                 /* work out what the new rdn value is, for updating the
2720                    rDN and name fields */
2721                 new_rdn_value = ldb_dn_get_rdn_val(new_dn);
2722
2723                 ret = ldb_msg_add_value(msg, strlower_talloc(tmp_ctx, rdn_name), new_rdn_value, &el);
2724                 if (ret != LDB_SUCCESS) {
2725                         talloc_free(tmp_ctx);
2726                         return ret;
2727                 }
2728                 el->flags = LDB_FLAG_MOD_REPLACE;
2729
2730                 el = ldb_msg_find_element(old_msg, "name");
2731                 if (el) {
2732                         ret = ldb_msg_add_value(msg, "name", new_rdn_value, &el);
2733                         if (ret != LDB_SUCCESS) {
2734                                 talloc_free(tmp_ctx);
2735                                 return ret;
2736                         }
2737                         el->flags = LDB_FLAG_MOD_REPLACE;
2738                 }
2739         }
2740
2741         ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE);
2742         if (ret != LDB_SUCCESS) {
2743                 ldb_asprintf_errstring(ldb, "replmd_delete: Failed to modify object %s in delete - %s",
2744                                        ldb_dn_get_linearized(old_dn), ldb_errstring(ldb));
2745                 talloc_free(tmp_ctx);
2746                 return ret;
2747         }
2748
2749         if (deletion_state == OBJECT_NOT_DELETED) {
2750                 /* now rename onto the new DN */
2751                 ret = dsdb_module_rename(module, old_dn, new_dn, DSDB_FLAG_NEXT_MODULE);
2752                 if (ret != LDB_SUCCESS){
2753                         DEBUG(0,(__location__ ": Failed to rename object from '%s' to '%s' - %s\n",
2754                                  ldb_dn_get_linearized(old_dn),
2755                                  ldb_dn_get_linearized(new_dn),
2756                                  ldb_errstring(ldb)));
2757                         talloc_free(tmp_ctx);
2758                         return ret;
2759                 }
2760         }
2761
2762         talloc_free(tmp_ctx);
2763
2764         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
2765 }
2766
2767
2768
2769 static int replmd_replicated_request_error(struct replmd_replicated_request *ar, int ret)
2770 {
2771         return ret;
2772 }
2773
2774 static int replmd_replicated_request_werror(struct replmd_replicated_request *ar, WERROR status)
2775 {
2776         int ret = LDB_ERR_OTHER;
2777         /* TODO: do some error mapping */
2778         return ret;
2779 }
2780
2781 static int replmd_replicated_apply_add(struct replmd_replicated_request *ar)
2782 {
2783         struct ldb_context *ldb;
2784         struct ldb_request *change_req;
2785         enum ndr_err_code ndr_err;
2786         struct ldb_message *msg;
2787         struct replPropertyMetaDataBlob *md;
2788         struct ldb_val md_value;
2789         unsigned int i;
2790         int ret;
2791
2792         /*
2793          * TODO: check if the parent object exist
2794          */
2795
2796         /*
2797          * TODO: handle the conflict case where an object with the
2798          *       same name exist
2799          */
2800
2801         ldb = ldb_module_get_ctx(ar->module);
2802         msg = ar->objs->objects[ar->index_current].msg;
2803         md = ar->objs->objects[ar->index_current].meta_data;
2804
2805         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2806         if (ret != LDB_SUCCESS) {
2807                 return replmd_replicated_request_error(ar, ret);
2808         }
2809
2810         ret = ldb_msg_add_value(msg, "objectGUID", &ar->objs->objects[ar->index_current].guid_value, NULL);
2811         if (ret != LDB_SUCCESS) {
2812                 return replmd_replicated_request_error(ar, ret);
2813         }
2814
2815         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2816         if (ret != LDB_SUCCESS) {
2817                 return replmd_replicated_request_error(ar, ret);
2818         }
2819
2820         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ar->seq_num);
2821         if (ret != LDB_SUCCESS) {
2822                 return replmd_replicated_request_error(ar, ret);
2823         }
2824
2825         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2826         if (ret != LDB_SUCCESS) {
2827                 return replmd_replicated_request_error(ar, ret);
2828         }
2829
2830         /* remove any message elements that have zero values */
2831         for (i=0; i<msg->num_elements; i++) {
2832                 struct ldb_message_element *el = &msg->elements[i];
2833
2834                 if (el->num_values == 0) {
2835                         DEBUG(4,(__location__ ": Removing attribute %s with num_values==0\n",
2836                                  el->name));
2837                         memmove(el, el+1, sizeof(*el)*(msg->num_elements - (i+1)));
2838                         msg->num_elements--;
2839                         i--;
2840                         continue;
2841                 }
2842         }
2843
2844         /*
2845          * the meta data array is already sorted by the caller
2846          */
2847         for (i=0; i < md->ctr.ctr1.count; i++) {
2848                 md->ctr.ctr1.array[i].local_usn = ar->seq_num;
2849         }
2850         ndr_err = ndr_push_struct_blob(&md_value, msg, md,
2851                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2852         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2853                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2854                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2855         }
2856         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &md_value, NULL);
2857         if (ret != LDB_SUCCESS) {
2858                 return replmd_replicated_request_error(ar, ret);
2859         }
2860
2861         replmd_ldb_message_sort(msg, ar->schema);
2862
2863         if (DEBUGLVL(4)) {
2864                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_ADD, msg);
2865                 DEBUG(4, ("DRS replication add message:\n%s\n", s));
2866                 talloc_free(s);
2867         }
2868
2869         ret = ldb_build_add_req(&change_req,
2870                                 ldb,
2871                                 ar,
2872                                 msg,
2873                                 ar->controls,
2874                                 ar,
2875                                 replmd_op_callback,
2876                                 ar->req);
2877         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2878
2879         return ldb_next_request(ar->module, change_req);
2880 }
2881
2882 /*
2883    return true if an update is newer than an existing entry
2884    see section 5.11 of MS-ADTS
2885 */
2886 static bool replmd_update_is_newer(const struct GUID *current_invocation_id,
2887                                    const struct GUID *update_invocation_id,
2888                                    uint32_t current_version,
2889                                    uint32_t update_version,
2890                                    NTTIME current_change_time,
2891                                    NTTIME update_change_time)
2892 {
2893         if (update_version != current_version) {
2894                 return update_version > current_version;
2895         }
2896         if (update_change_time > current_change_time) {
2897                 return true;
2898         }
2899         if (update_change_time == current_change_time) {
2900                 return GUID_compare(update_invocation_id, current_invocation_id) > 0;
2901         }
2902         return false;
2903 }
2904
2905 static bool replmd_replPropertyMetaData1_is_newer(struct replPropertyMetaData1 *cur_m,
2906                                                   struct replPropertyMetaData1 *new_m)
2907 {
2908         return replmd_update_is_newer(&cur_m->originating_invocation_id,
2909                                       &new_m->originating_invocation_id,
2910                                       cur_m->version,
2911                                       new_m->version,
2912                                       cur_m->originating_change_time,
2913                                       new_m->originating_change_time);
2914 }
2915
2916 static struct replPropertyMetaData1 *
2917 replmd_replPropertyMetaData1_find_attid(struct replPropertyMetaDataBlob *md_blob,
2918                                         enum drsuapi_DsAttributeId attid)
2919 {
2920         uint32_t i;
2921         struct replPropertyMetaDataCtr1 *rpmd_ctr = &md_blob->ctr.ctr1;
2922
2923         for (i = 0; i < rpmd_ctr->count; i++) {
2924                 if (rpmd_ctr->array[i].attid == attid) {
2925                         return &rpmd_ctr->array[i];
2926                 }
2927         }
2928         return NULL;
2929 }
2930
2931 static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
2932 {
2933         struct ldb_context *ldb;
2934         struct ldb_request *change_req;
2935         enum ndr_err_code ndr_err;
2936         struct ldb_message *msg;
2937         struct replPropertyMetaDataBlob *rmd;
2938         struct replPropertyMetaDataBlob omd;
2939         const struct ldb_val *omd_value;
2940         struct replPropertyMetaDataBlob nmd;
2941         struct ldb_val nmd_value;
2942         struct replPropertyMetaData1 *md_remote;
2943         struct replPropertyMetaData1 *md_local;
2944         unsigned int i;
2945         uint32_t j,ni=0;
2946         unsigned int removed_attrs = 0;
2947         int ret;
2948
2949         ldb = ldb_module_get_ctx(ar->module);
2950         msg = ar->objs->objects[ar->index_current].msg;
2951         rmd = ar->objs->objects[ar->index_current].meta_data;
2952         ZERO_STRUCT(omd);
2953         omd.version = 1;
2954
2955         /* find existing meta data */
2956         omd_value = ldb_msg_find_ldb_val(ar->search_msg, "replPropertyMetaData");
2957         if (omd_value) {
2958                 ndr_err = ndr_pull_struct_blob(omd_value, ar, &omd,
2959                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
2960                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2961                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2962                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2963                 }
2964
2965                 if (omd.version != 1) {
2966                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
2967                 }
2968         }
2969
2970         /* check if remote 'name' has change,
2971          * which indicates a rename operation */
2972         md_remote = replmd_replPropertyMetaData1_find_attid(rmd, DRSUAPI_ATTRIBUTE_name);
2973         if (md_remote) {
2974                 md_local = replmd_replPropertyMetaData1_find_attid(&omd, DRSUAPI_ATTRIBUTE_name);
2975                 SMB_ASSERT(md_local);
2976                 if (replmd_replPropertyMetaData1_is_newer(md_local, md_remote)) {
2977                         SMB_ASSERT(ldb_dn_compare(msg->dn, ar->search_msg->dn) != 0);
2978                         /* TODO: Find appropriate local name (dn) for the object
2979                          *       and modify msg->dn appropriately */
2980
2981                         DEBUG(4,("replmd_replicated_request rename %s => %s\n",
2982                                   ldb_dn_get_linearized(ar->search_msg->dn),
2983                                   ldb_dn_get_linearized(msg->dn)));
2984                         /* pass rename to the next module
2985                          * so it doesn't appear as an originating update */
2986                         ret = dsdb_module_rename(ar->module,
2987                                                  ar->search_msg->dn, msg->dn,
2988                                                  DSDB_FLAG_NEXT_MODULE);
2989                         if (ret != LDB_SUCCESS) {
2990                                 ldb_debug(ldb, LDB_DEBUG_FATAL,
2991                                           "replmd_replicated_request rename %s => %s failed - %s\n",
2992                                           ldb_dn_get_linearized(ar->search_msg->dn),
2993                                           ldb_dn_get_linearized(msg->dn),
2994                                           ldb_errstring(ldb));
2995                                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_DB_ERROR);
2996                         }
2997                 }
2998         }
2999
3000         ZERO_STRUCT(nmd);
3001         nmd.version = 1;
3002         nmd.ctr.ctr1.count = omd.ctr.ctr1.count + rmd->ctr.ctr1.count;
3003         nmd.ctr.ctr1.array = talloc_array(ar,
3004                                           struct replPropertyMetaData1,
3005                                           nmd.ctr.ctr1.count);
3006         if (!nmd.ctr.ctr1.array) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3007
3008         /* first copy the old meta data */
3009         for (i=0; i < omd.ctr.ctr1.count; i++) {
3010                 nmd.ctr.ctr1.array[ni]  = omd.ctr.ctr1.array[i];
3011                 ni++;
3012         }
3013
3014         /* now merge in the new meta data */
3015         for (i=0; i < rmd->ctr.ctr1.count; i++) {
3016                 bool found = false;
3017
3018                 for (j=0; j < ni; j++) {
3019                         bool cmp;
3020
3021                         if (rmd->ctr.ctr1.array[i].attid != nmd.ctr.ctr1.array[j].attid) {
3022                                 continue;
3023                         }
3024
3025                         cmp = replmd_replPropertyMetaData1_is_newer(&nmd.ctr.ctr1.array[j],
3026                                                                     &rmd->ctr.ctr1.array[i]);
3027                         if (cmp) {
3028                                 /* replace the entry */
3029                                 nmd.ctr.ctr1.array[j] = rmd->ctr.ctr1.array[i];
3030                                 found = true;
3031                                 break;
3032                         }
3033
3034                         if (rmd->ctr.ctr1.array[i].attid != DRSUAPI_ATTRIBUTE_instanceType) {
3035                                 DEBUG(3,("Discarding older DRS attribute update to %s on %s from %s\n",
3036                                          msg->elements[i-removed_attrs].name,
3037                                          ldb_dn_get_linearized(msg->dn),
3038                                          GUID_string(ar, &rmd->ctr.ctr1.array[i].originating_invocation_id)));
3039                         }
3040
3041                         /* we don't want to apply this change so remove the attribute */
3042                         ldb_msg_remove_element(msg, &msg->elements[i-removed_attrs]);
3043                         removed_attrs++;
3044
3045                         found = true;
3046                         break;
3047                 }
3048
3049                 if (found) continue;
3050
3051                 nmd.ctr.ctr1.array[ni] = rmd->ctr.ctr1.array[i];
3052                 ni++;
3053         }
3054
3055         /*
3056          * finally correct the size of the meta_data array
3057          */
3058         nmd.ctr.ctr1.count = ni;
3059
3060         /*
3061          * the rdn attribute (the alias for the name attribute),
3062          * 'cn' for most objects is the last entry in the meta data array
3063          * we have stored
3064          *
3065          * sort the new meta data array
3066          */
3067         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ar->schema, msg->dn);
3068         if (ret != LDB_SUCCESS) {
3069                 return ret;
3070         }
3071
3072         /*
3073          * check if some replicated attributes left, otherwise skip the ldb_modify() call
3074          */
3075         if (msg->num_elements == 0) {
3076                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: skip replace\n",
3077                           ar->index_current);
3078
3079                 ar->index_current++;
3080                 return replmd_replicated_apply_next(ar);
3081         }
3082
3083         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: replace %u attributes\n",
3084                   ar->index_current, msg->num_elements);
3085
3086         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
3087         if (ret != LDB_SUCCESS) {
3088                 return replmd_replicated_request_error(ar, ret);
3089         }
3090
3091         for (i=0; i<ni; i++) {
3092                 nmd.ctr.ctr1.array[i].local_usn = ar->seq_num;
3093         }
3094
3095         /* create the meta data value */
3096         ndr_err = ndr_push_struct_blob(&nmd_value, msg, &nmd,
3097                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
3098         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3099                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3100                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3101         }
3102
3103         /*
3104          * when we know that we'll modify the record, add the whenChanged, uSNChanged
3105          * and replPopertyMetaData attributes
3106          */
3107         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
3108         if (ret != LDB_SUCCESS) {
3109                 return replmd_replicated_request_error(ar, ret);
3110         }
3111         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
3112         if (ret != LDB_SUCCESS) {
3113                 return replmd_replicated_request_error(ar, ret);
3114         }
3115         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
3116         if (ret != LDB_SUCCESS) {
3117                 return replmd_replicated_request_error(ar, ret);
3118         }
3119
3120         replmd_ldb_message_sort(msg, ar->schema);
3121
3122         /* we want to replace the old values */
3123         for (i=0; i < msg->num_elements; i++) {
3124                 msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
3125         }
3126
3127         if (DEBUGLVL(4)) {
3128                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
3129                 DEBUG(4, ("DRS replication modify message:\n%s\n", s));
3130                 talloc_free(s);
3131         }
3132
3133         ret = ldb_build_mod_req(&change_req,
3134                                 ldb,
3135                                 ar,
3136                                 msg,
3137                                 ar->controls,
3138                                 ar,
3139                                 replmd_op_callback,
3140                                 ar->req);
3141         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3142
3143         return ldb_next_request(ar->module, change_req);
3144 }
3145
3146 static int replmd_replicated_apply_search_callback(struct ldb_request *req,
3147                                                    struct ldb_reply *ares)
3148 {
3149         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3150                                                struct replmd_replicated_request);
3151         int ret;
3152
3153         if (!ares) {
3154                 return ldb_module_done(ar->req, NULL, NULL,
3155                                         LDB_ERR_OPERATIONS_ERROR);
3156         }
3157         if (ares->error != LDB_SUCCESS &&
3158             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3159                 return ldb_module_done(ar->req, ares->controls,
3160                                         ares->response, ares->error);
3161         }
3162
3163         switch (ares->type) {
3164         case LDB_REPLY_ENTRY:
3165                 ar->search_msg = talloc_steal(ar, ares->message);
3166                 break;
3167
3168         case LDB_REPLY_REFERRAL:
3169                 /* we ignore referrals */
3170                 break;
3171
3172         case LDB_REPLY_DONE:
3173                 if (ar->search_msg != NULL) {
3174                         ret = replmd_replicated_apply_merge(ar);
3175                 } else {
3176                         ret = replmd_replicated_apply_add(ar);
3177                 }
3178                 if (ret != LDB_SUCCESS) {
3179                         return ldb_module_done(ar->req, NULL, NULL, ret);
3180                 }
3181         }
3182
3183         talloc_free(ares);
3184         return LDB_SUCCESS;
3185 }
3186
3187 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar);
3188
3189 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar)
3190 {
3191         struct ldb_context *ldb;
3192         int ret;
3193         char *tmp_str;
3194         char *filter;
3195         struct ldb_request *search_req;
3196         struct ldb_search_options_control *options;
3197
3198         if (ar->index_current >= ar->objs->num_objects) {
3199                 /* done with it, go to next stage */
3200                 return replmd_replicated_uptodate_vector(ar);
3201         }
3202
3203         ldb = ldb_module_get_ctx(ar->module);
3204         ar->search_msg = NULL;
3205
3206         tmp_str = ldb_binary_encode(ar, ar->objs->objects[ar->index_current].guid_value);
3207         if (!tmp_str) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3208
3209         filter = talloc_asprintf(ar, "(objectGUID=%s)", tmp_str);
3210         if (!filter) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3211         talloc_free(tmp_str);
3212
3213         ret = ldb_build_search_req(&search_req,
3214                                    ldb,
3215                                    ar,
3216                                    NULL,
3217                                    LDB_SCOPE_SUBTREE,
3218                                    filter,
3219                                    NULL,
3220                                    NULL,
3221                                    ar,
3222                                    replmd_replicated_apply_search_callback,
3223                                    ar->req);
3224
3225         ret = ldb_request_add_control(search_req, LDB_CONTROL_SHOW_DELETED_OID, true, NULL);
3226         if (ret != LDB_SUCCESS) {
3227                 return ret;
3228         }
3229
3230         /* we need to cope with cross-partition links, so search for
3231            the GUID over all partitions */
3232         options = talloc(search_req, struct ldb_search_options_control);
3233         if (options == NULL) {
3234                 DEBUG(0, (__location__ ": out of memory\n"));
3235                 return LDB_ERR_OPERATIONS_ERROR;
3236         }
3237         options->search_options = LDB_SEARCH_OPTION_PHANTOM_ROOT;
3238
3239         ret = ldb_request_add_control(search_req,
3240                                       LDB_CONTROL_SEARCH_OPTIONS_OID,
3241                                       true, options);
3242         if (ret != LDB_SUCCESS) {
3243                 return ret;
3244         }
3245
3246         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3247
3248         return ldb_next_request(ar->module, search_req);
3249 }
3250
3251 static int replmd_replicated_uptodate_modify_callback(struct ldb_request *req,
3252                                                       struct ldb_reply *ares)
3253 {
3254         struct ldb_context *ldb;
3255         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3256                                                struct replmd_replicated_request);
3257         ldb = ldb_module_get_ctx(ar->module);
3258
3259         if (!ares) {
3260                 return ldb_module_done(ar->req, NULL, NULL,
3261                                         LDB_ERR_OPERATIONS_ERROR);
3262         }
3263         if (ares->error != LDB_SUCCESS) {
3264                 return ldb_module_done(ar->req, ares->controls,
3265                                         ares->response, ares->error);
3266         }
3267
3268         if (ares->type != LDB_REPLY_DONE) {
3269                 ldb_set_errstring(ldb, "Invalid reply type\n!");
3270                 return ldb_module_done(ar->req, NULL, NULL,
3271                                         LDB_ERR_OPERATIONS_ERROR);
3272         }
3273
3274         talloc_free(ares);
3275
3276         return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
3277 }
3278
3279 static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *ar)
3280 {
3281         struct ldb_context *ldb;
3282         struct ldb_request *change_req;
3283         enum ndr_err_code ndr_err;
3284         struct ldb_message *msg;
3285         struct replUpToDateVectorBlob ouv;
3286         const struct ldb_val *ouv_value;
3287         const struct drsuapi_DsReplicaCursor2CtrEx *ruv;
3288         struct replUpToDateVectorBlob nuv;
3289         struct ldb_val nuv_value;
3290         struct ldb_message_element *nuv_el = NULL;
3291         const struct GUID *our_invocation_id;
3292         struct ldb_message_element *orf_el = NULL;
3293         struct repsFromToBlob nrf;
3294         struct ldb_val *nrf_value = NULL;
3295         struct ldb_message_element *nrf_el = NULL;
3296         unsigned int i;
3297         uint32_t j,ni=0;
3298         bool found = false;
3299         time_t t = time(NULL);
3300         NTTIME now;
3301         int ret;
3302
3303         ldb = ldb_module_get_ctx(ar->module);
3304         ruv = ar->objs->uptodateness_vector;
3305         ZERO_STRUCT(ouv);
3306         ouv.version = 2;
3307         ZERO_STRUCT(nuv);
3308         nuv.version = 2;
3309
3310         unix_to_nt_time(&now, t);
3311
3312         /*
3313          * first create the new replUpToDateVector
3314          */
3315         ouv_value = ldb_msg_find_ldb_val(ar->search_msg, "replUpToDateVector");
3316         if (ouv_value) {
3317                 ndr_err = ndr_pull_struct_blob(ouv_value, ar, &ouv,
3318                                                (ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob);
3319                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3320                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3321                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3322                 }
3323
3324                 if (ouv.version != 2) {
3325                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3326                 }
3327         }
3328
3329         /*
3330          * the new uptodateness vector will at least
3331          * contain 1 entry, one for the source_dsa
3332          *
3333          * plus optional values from our old vector and the one from the source_dsa
3334          */
3335         nuv.ctr.ctr2.count = 1 + ouv.ctr.ctr2.count;
3336         if (ruv) nuv.ctr.ctr2.count += ruv->count;
3337         nuv.ctr.ctr2.cursors = talloc_array(ar,
3338                                             struct drsuapi_DsReplicaCursor2,
3339                                             nuv.ctr.ctr2.count);
3340         if (!nuv.ctr.ctr2.cursors) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3341
3342         /* first copy the old vector */
3343         for (i=0; i < ouv.ctr.ctr2.count; i++) {
3344                 nuv.ctr.ctr2.cursors[ni] = ouv.ctr.ctr2.cursors[i];
3345                 ni++;
3346         }
3347
3348         /* get our invocation_id if we have one already attached to the ldb */
3349         our_invocation_id = samdb_ntds_invocation_id(ldb);
3350
3351         /* merge in the source_dsa vector is available */
3352         for (i=0; (ruv && i < ruv->count); i++) {
3353                 found = false;
3354
3355                 if (our_invocation_id &&
3356                     GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
3357                                our_invocation_id)) {
3358                         continue;
3359                 }
3360
3361                 for (j=0; j < ni; j++) {
3362                         if (!GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
3363                                         &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
3364                                 continue;
3365                         }
3366
3367                         found = true;
3368
3369                         /*
3370                          * we update only the highest_usn and not the latest_sync_success time,
3371                          * because the last success stands for direct replication
3372                          */
3373                         if (ruv->cursors[i].highest_usn > nuv.ctr.ctr2.cursors[j].highest_usn) {
3374                                 nuv.ctr.ctr2.cursors[j].highest_usn = ruv->cursors[i].highest_usn;
3375                         }
3376                         break;
3377                 }
3378
3379                 if (found) continue;
3380
3381                 /* if it's not there yet, add it */
3382                 nuv.ctr.ctr2.cursors[ni] = ruv->cursors[i];
3383                 ni++;
3384         }
3385
3386         /*
3387          * merge in the current highwatermark for the source_dsa
3388          */
3389         found = false;
3390         for (j=0; j < ni; j++) {
3391                 if (!GUID_equal(&ar->objs->source_dsa->source_dsa_invocation_id,
3392                                 &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
3393                         continue;
3394                 }
3395
3396                 found = true;
3397
3398                 /*
3399                  * here we update the highest_usn and last_sync_success time
3400                  * because we're directly replicating from the source_dsa
3401                  *
3402                  * and use the tmp_highest_usn because this is what we have just applied
3403                  * to our ldb
3404                  */
3405                 nuv.ctr.ctr2.cursors[j].highest_usn             = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
3406                 nuv.ctr.ctr2.cursors[j].last_sync_success       = now;
3407                 break;
3408         }
3409         if (!found) {
3410                 /*
3411                  * here we update the highest_usn and last_sync_success time
3412                  * because we're directly replicating from the source_dsa
3413                  *
3414                  * and use the tmp_highest_usn because this is what we have just applied
3415                  * to our ldb
3416                  */
3417                 nuv.ctr.ctr2.cursors[ni].source_dsa_invocation_id= ar->objs->source_dsa->source_dsa_invocation_id;
3418                 nuv.ctr.ctr2.cursors[ni].highest_usn            = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
3419                 nuv.ctr.ctr2.cursors[ni].last_sync_success      = now;
3420                 ni++;
3421         }
3422
3423         /*
3424          * finally correct the size of the cursors array
3425          */
3426         nuv.ctr.ctr2.count = ni;
3427
3428         /*
3429          * sort the cursors
3430          */
3431         TYPESAFE_QSORT(nuv.ctr.ctr2.cursors, nuv.ctr.ctr2.count, drsuapi_DsReplicaCursor2_compare);
3432
3433         /*
3434          * create the change ldb_message
3435          */
3436         msg = ldb_msg_new(ar);
3437         if (!msg) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3438         msg->dn = ar->search_msg->dn;
3439
3440         ndr_err = ndr_push_struct_blob(&nuv_value, msg, &nuv,
3441                                        (ndr_push_flags_fn_t)ndr_push_replUpToDateVectorBlob);
3442         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3443                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3444                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3445         }
3446         ret = ldb_msg_add_value(msg, "replUpToDateVector", &nuv_value, &nuv_el);
3447         if (ret != LDB_SUCCESS) {
3448                 return replmd_replicated_request_error(ar, ret);
3449         }
3450         nuv_el->flags = LDB_FLAG_MOD_REPLACE;
3451
3452         /*
3453          * now create the new repsFrom value from the given repsFromTo1 structure
3454          */
3455         ZERO_STRUCT(nrf);
3456         nrf.version                                     = 1;
3457         nrf.ctr.ctr1                                    = *ar->objs->source_dsa;
3458         /* and fix some values... */
3459         nrf.ctr.ctr1.consecutive_sync_failures          = 0;
3460         nrf.ctr.ctr1.last_success                       = now;
3461         nrf.ctr.ctr1.last_attempt                       = now;
3462         nrf.ctr.ctr1.result_last_attempt                = WERR_OK;
3463         nrf.ctr.ctr1.highwatermark.highest_usn          = nrf.ctr.ctr1.highwatermark.tmp_highest_usn;
3464
3465         /*
3466          * first see if we already have a repsFrom value for the current source dsa
3467          * if so we'll later replace this value
3468          */
3469         orf_el = ldb_msg_find_element(ar->search_msg, "repsFrom");
3470         if (orf_el) {
3471                 for (i=0; i < orf_el->num_values; i++) {
3472                         struct repsFromToBlob *trf;
3473
3474                         trf = talloc(ar, struct repsFromToBlob);
3475                         if (!trf) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3476
3477                         ndr_err = ndr_pull_struct_blob(&orf_el->values[i], trf, trf,
3478                                                        (ndr_pull_flags_fn_t)ndr_pull_repsFromToBlob);
3479                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3480                                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3481                                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3482                         }
3483
3484                         if (trf->version != 1) {
3485                                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3486                         }
3487
3488                         /*
3489                          * we compare the source dsa objectGUID not the invocation_id
3490                          * because we want only one repsFrom value per source dsa
3491                          * and when the invocation_id of the source dsa has changed we don't need
3492                          * the old repsFrom with the old invocation_id
3493                          */
3494                         if (!GUID_equal(&trf->ctr.ctr1.source_dsa_obj_guid,
3495                                         &ar->objs->source_dsa->source_dsa_obj_guid)) {
3496                                 talloc_free(trf);
3497                                 continue;
3498                         }
3499
3500                         talloc_free(trf);
3501                         nrf_value = &orf_el->values[i];
3502                         break;
3503                 }
3504
3505                 /*
3506                  * copy over all old values to the new ldb_message
3507                  */
3508                 ret = ldb_msg_add_empty(msg, "repsFrom", 0, &nrf_el);
3509                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3510                 *nrf_el = *orf_el;
3511         }
3512
3513         /*
3514          * if we haven't found an old repsFrom value for the current source dsa
3515          * we'll add a new value
3516          */
3517         if (!nrf_value) {
3518                 struct ldb_val zero_value;
3519                 ZERO_STRUCT(zero_value);
3520                 ret = ldb_msg_add_value(msg, "repsFrom", &zero_value, &nrf_el);
3521                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3522
3523                 nrf_value = &nrf_el->values[nrf_el->num_values - 1];
3524         }
3525
3526         /* we now fill the value which is already attached to ldb_message */
3527         ndr_err = ndr_push_struct_blob(nrf_value, msg,
3528                                        &nrf,
3529                                        (ndr_push_flags_fn_t)ndr_push_repsFromToBlob);
3530         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3531                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3532                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3533         }
3534
3535         /*
3536          * the ldb_message_element for the attribute, has all the old values and the new one
3537          * so we'll replace the whole attribute with all values
3538          */
3539         nrf_el->flags = LDB_FLAG_MOD_REPLACE;
3540
3541         if (DEBUGLVL(4)) {
3542                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
3543                 DEBUG(4, ("DRS replication uptodate modify message:\n%s\n", s));
3544                 talloc_free(s);
3545         }
3546
3547         /* prepare the ldb_modify() request */
3548         ret = ldb_build_mod_req(&change_req,
3549                                 ldb,
3550                                 ar,
3551                                 msg,
3552                                 ar->controls,
3553                                 ar,
3554                                 replmd_replicated_uptodate_modify_callback,
3555                                 ar->req);
3556         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3557
3558         return ldb_next_request(ar->module, change_req);
3559 }
3560
3561 static int replmd_replicated_uptodate_search_callback(struct ldb_request *req,
3562                                                       struct ldb_reply *ares)
3563 {
3564         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3565                                                struct replmd_replicated_request);
3566         int ret;
3567
3568         if (!ares) {
3569                 return ldb_module_done(ar->req, NULL, NULL,
3570                                         LDB_ERR_OPERATIONS_ERROR);
3571         }
3572         if (ares->error != LDB_SUCCESS &&
3573             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3574                 return ldb_module_done(ar->req, ares->controls,
3575                                         ares->response, ares->error);
3576         }
3577
3578         switch (ares->type) {
3579         case LDB_REPLY_ENTRY:
3580                 ar->search_msg = talloc_steal(ar, ares->message);
3581                 break;
3582
3583         case LDB_REPLY_REFERRAL:
3584                 /* we ignore referrals */
3585                 break;
3586
3587         case LDB_REPLY_DONE:
3588                 if (ar->search_msg == NULL) {
3589                         ret = replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3590                 } else {
3591                         ret = replmd_replicated_uptodate_modify(ar);
3592                 }
3593                 if (ret != LDB_SUCCESS) {
3594                         return ldb_module_done(ar->req, NULL, NULL, ret);
3595                 }
3596         }
3597
3598         talloc_free(ares);
3599         return LDB_SUCCESS;
3600 }
3601
3602
3603 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar)
3604 {
3605         struct ldb_context *ldb;
3606         int ret;
3607         static const char *attrs[] = {
3608                 "replUpToDateVector",
3609                 "repsFrom",
3610                 NULL
3611         };
3612         struct ldb_request *search_req;
3613
3614         ldb = ldb_module_get_ctx(ar->module);
3615         ar->search_msg = NULL;
3616
3617         ret = ldb_build_search_req(&search_req,
3618                                    ldb,
3619                                    ar,
3620                                    ar->objs->partition_dn,
3621                                    LDB_SCOPE_BASE,
3622                                    "(objectClass=*)",
3623                                    attrs,
3624                                    NULL,
3625                                    ar,
3626                                    replmd_replicated_uptodate_search_callback,
3627                                    ar->req);
3628         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3629
3630         return ldb_next_request(ar->module, search_req);
3631 }
3632
3633
3634
3635 static int replmd_extended_replicated_objects(struct ldb_module *module, struct ldb_request *req)
3636 {
3637         struct ldb_context *ldb;
3638         struct dsdb_extended_replicated_objects *objs;
3639         struct replmd_replicated_request *ar;
3640         struct ldb_control **ctrls;
3641         int ret;
3642         uint32_t i;
3643         struct replmd_private *replmd_private =
3644                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3645
3646         ldb = ldb_module_get_ctx(module);
3647
3648         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_extended_replicated_objects\n");
3649
3650         objs = talloc_get_type(req->op.extended.data, struct dsdb_extended_replicated_objects);
3651         if (!objs) {
3652                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: invalid extended data\n");
3653                 return LDB_ERR_PROTOCOL_ERROR;
3654         }
3655
3656         if (objs->version != DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION) {
3657                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: extended data invalid version [%u != %u]\n",
3658                           objs->version, DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION);
3659                 return LDB_ERR_PROTOCOL_ERROR;
3660         }
3661
3662         ar = replmd_ctx_init(module, req);
3663         if (!ar)
3664                 return LDB_ERR_OPERATIONS_ERROR;
3665
3666         /* Set the flags to have the replmd_op_callback run over the full set of objects */
3667         ar->apply_mode = true;
3668         ar->objs = objs;
3669         ar->schema = dsdb_get_schema(ldb, ar);
3670         if (!ar->schema) {
3671                 ldb_debug_set(ldb, LDB_DEBUG_FATAL, "replmd_ctx_init: no loaded schema found\n");
3672                 talloc_free(ar);
3673                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
3674                 return LDB_ERR_CONSTRAINT_VIOLATION;
3675         }
3676
3677         ctrls = req->controls;
3678
3679         if (req->controls) {
3680                 req->controls = talloc_memdup(ar, req->controls,
3681                                               talloc_get_size(req->controls));
3682                 if (!req->controls) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3683         }
3684
3685         /* This allows layers further down to know if a change came in over replication */
3686         ret = ldb_request_add_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID, false, NULL);
3687         if (ret != LDB_SUCCESS) {
3688                 return ret;
3689         }
3690
3691         /* If this change contained linked attributes in the body
3692          * (rather than in the links section) we need to update
3693          * backlinks in linked_attributes */
3694         ret = ldb_request_add_control(req, DSDB_CONTROL_APPLY_LINKS, false, NULL);
3695         if (ret != LDB_SUCCESS) {
3696                 return ret;
3697         }
3698
3699         ar->controls = req->controls;
3700         req->controls = ctrls;
3701
3702         DEBUG(4,("linked_attributes_count=%u\n", objs->linked_attributes_count));
3703
3704         /* save away the linked attributes for the end of the
3705            transaction */
3706         for (i=0; i<ar->objs->linked_attributes_count; i++) {
3707                 struct la_entry *la_entry;
3708
3709                 if (replmd_private->la_ctx == NULL) {
3710                         replmd_private->la_ctx = talloc_new(replmd_private);
3711                 }
3712                 la_entry = talloc(replmd_private->la_ctx, struct la_entry);
3713                 if (la_entry == NULL) {
3714                         ldb_oom(ldb);
3715                         return LDB_ERR_OPERATIONS_ERROR;
3716                 }
3717                 la_entry->la = talloc(la_entry, struct drsuapi_DsReplicaLinkedAttribute);
3718                 if (la_entry->la == NULL) {
3719                         talloc_free(la_entry);
3720                         ldb_oom(ldb);
3721                         return LDB_ERR_OPERATIONS_ERROR;
3722                 }
3723                 *la_entry->la = ar->objs->linked_attributes[i];
3724
3725                 /* we need to steal the non-scalars so they stay
3726                    around until the end of the transaction */
3727                 talloc_steal(la_entry->la, la_entry->la->identifier);
3728                 talloc_steal(la_entry->la, la_entry->la->value.blob);
3729
3730                 DLIST_ADD(replmd_private->la_list, la_entry);
3731         }
3732
3733         return replmd_replicated_apply_next(ar);
3734 }
3735
3736 /*
3737   process one linked attribute structure
3738  */
3739 static int replmd_process_linked_attribute(struct ldb_module *module,
3740                                            struct la_entry *la_entry)
3741 {
3742         struct drsuapi_DsReplicaLinkedAttribute *la = la_entry->la;
3743         struct ldb_context *ldb = ldb_module_get_ctx(module);
3744         struct ldb_message *msg;
3745         TALLOC_CTX *tmp_ctx = talloc_new(la_entry);
3746         const struct dsdb_schema *schema = dsdb_get_schema(ldb, tmp_ctx);
3747         int ret;
3748         const struct dsdb_attribute *attr;
3749         struct dsdb_dn *dsdb_dn;
3750         uint64_t seq_num = 0;
3751         struct ldb_message_element *old_el;
3752         WERROR status;
3753         time_t t = time(NULL);
3754         struct ldb_result *res;
3755         const char *attrs[2];
3756         struct parsed_dn *pdn_list, *pdn;
3757         struct GUID guid = GUID_zero();
3758         NTSTATUS ntstatus;
3759         bool active = (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?true:false;
3760         const struct GUID *our_invocation_id;
3761
3762 /*
3763 linked_attributes[0]:
3764      &objs->linked_attributes[i]: struct drsuapi_DsReplicaLinkedAttribute
3765         identifier               : *
3766             identifier: struct drsuapi_DsReplicaObjectIdentifier
3767                 __ndr_size               : 0x0000003a (58)
3768                 __ndr_size_sid           : 0x00000000 (0)
3769                 guid                     : 8e95b6a9-13dd-4158-89db-3220a5be5cc7
3770                 sid                      : S-0-0
3771                 __ndr_size_dn            : 0x00000000 (0)
3772                 dn                       : ''
3773         attid                    : DRSUAPI_ATTRIBUTE_member (0x1F)
3774         value: struct drsuapi_DsAttributeValue
3775             __ndr_size               : 0x0000007e (126)
3776             blob                     : *
3777                 blob                     : DATA_BLOB length=126
3778         flags                    : 0x00000001 (1)
3779                1: DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE
3780         originating_add_time     : Wed Sep  2 22:20:01 2009 EST
3781         meta_data: struct drsuapi_DsReplicaMetaData
3782             version                  : 0x00000015 (21)
3783             originating_change_time  : Wed Sep  2 23:39:07 2009 EST
3784             originating_invocation_id: 794640f3-18cf-40ee-a211-a93992b67a64
3785             originating_usn          : 0x000000000001e19c (123292)
3786
3787 (for cases where the link is to a normal DN)
3788      &target: struct drsuapi_DsReplicaObjectIdentifier3
3789         __ndr_size               : 0x0000007e (126)
3790         __ndr_size_sid           : 0x0000001c (28)
3791         guid                     : 7639e594-db75-4086-b0d4-67890ae46031
3792         sid                      : S-1-5-21-2848215498-2472035911-1947525656-19924
3793         __ndr_size_dn            : 0x00000022 (34)
3794         dn                       : 'CN=UOne,OU=TestOU,DC=vsofs8,DC=com'
3795  */
3796
3797         /* find the attribute being modified */
3798         attr = dsdb_attribute_by_attributeID_id(schema, la->attid);
3799         if (attr == NULL) {
3800                 DEBUG(0, (__location__ ": Unable to find attributeID 0x%x\n", la->attid));
3801                 talloc_free(tmp_ctx);
3802                 return LDB_ERR_OPERATIONS_ERROR;
3803         }
3804
3805         attrs[0] = attr->lDAPDisplayName;
3806         attrs[1] = NULL;
3807
3808         /* get the existing message from the db for the object with
3809            this GUID, returning attribute being modified. We will then
3810            use this msg as the basis for a modify call */
3811         ret = dsdb_module_search(module, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE, attrs,
3812                                  DSDB_FLAG_NEXT_MODULE |
3813                                  DSDB_SEARCH_SEARCH_ALL_PARTITIONS |
3814                                  DSDB_SEARCH_SHOW_DELETED |
3815                                  DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
3816                                  DSDB_SEARCH_REVEAL_INTERNALS,
3817                                  "objectGUID=%s", GUID_string(tmp_ctx, &la->identifier->guid));
3818         if (ret != LDB_SUCCESS) {
3819                 talloc_free(tmp_ctx);
3820                 return ret;
3821         }
3822         if (res->count != 1) {
3823                 ldb_asprintf_errstring(ldb, "DRS linked attribute for GUID %s - DN not found",
3824                                        GUID_string(tmp_ctx, &la->identifier->guid));
3825                 talloc_free(tmp_ctx);
3826                 return LDB_ERR_NO_SUCH_OBJECT;
3827         }
3828         msg = res->msgs[0];
3829
3830         if (msg->num_elements == 0) {
3831                 ret = ldb_msg_add_empty(msg, attr->lDAPDisplayName, LDB_FLAG_MOD_REPLACE, &old_el);
3832                 if (ret != LDB_SUCCESS) {
3833                         ldb_module_oom(module);
3834                         talloc_free(tmp_ctx);
3835                         return LDB_ERR_OPERATIONS_ERROR;
3836                 }
3837         } else {
3838                 old_el = &msg->elements[0];
3839                 old_el->flags = LDB_FLAG_MOD_REPLACE;
3840         }
3841
3842         /* parse the existing links */
3843         ret = get_parsed_dns(module, tmp_ctx, old_el, &pdn_list, attr->syntax->ldap_oid);
3844         if (ret != LDB_SUCCESS) {
3845                 talloc_free(tmp_ctx);
3846                 return ret;
3847         }
3848
3849         /* get our invocationId */
3850         our_invocation_id = samdb_ntds_invocation_id(ldb);
3851         if (!our_invocation_id) {
3852                 ldb_debug_set(ldb, LDB_DEBUG_ERROR, __location__ ": unable to find invocationId\n");
3853                 talloc_free(tmp_ctx);
3854                 return LDB_ERR_OPERATIONS_ERROR;
3855         }
3856
3857         ret = replmd_check_upgrade_links(pdn_list, old_el->num_values, old_el, our_invocation_id);
3858         if (ret != LDB_SUCCESS) {
3859                 talloc_free(tmp_ctx);
3860                 return ret;
3861         }
3862
3863         status = dsdb_dn_la_from_blob(ldb, attr, schema, tmp_ctx, la->value.blob, &dsdb_dn);
3864         if (!W_ERROR_IS_OK(status)) {
3865                 ldb_asprintf_errstring(ldb, "Failed to parsed linked attribute blob for %s on %s - %s\n",
3866                                        old_el->name, ldb_dn_get_linearized(msg->dn), win_errstr(status));
3867                 return LDB_ERR_OPERATIONS_ERROR;
3868         }
3869
3870         ntstatus = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid, "GUID");
3871         if (!NT_STATUS_IS_OK(ntstatus) && active) {
3872                 ldb_asprintf_errstring(ldb, "Failed to find GUID in linked attribute blob for %s on %s from %s",
3873                                        old_el->name,
3874                                        ldb_dn_get_linearized(dsdb_dn->dn),
3875                                        ldb_dn_get_linearized(msg->dn));
3876                 return LDB_ERR_OPERATIONS_ERROR;
3877         }
3878
3879         /* re-resolve the DN by GUID, as the DRS server may give us an
3880            old DN value */
3881         ret = dsdb_module_dn_by_guid(module, dsdb_dn, &guid, &dsdb_dn->dn);
3882         if (ret != LDB_SUCCESS) {
3883                 DEBUG(2,(__location__ ": WARNING: Failed to re-resolve GUID %s - using %s",
3884                          GUID_string(tmp_ctx, &guid),
3885                          ldb_dn_get_linearized(dsdb_dn->dn)));
3886         }
3887
3888         /* see if this link already exists */
3889         pdn = parsed_dn_find(pdn_list, old_el->num_values, &guid, dsdb_dn->dn);
3890         if (pdn != NULL) {
3891                 /* see if this update is newer than what we have already */
3892                 struct GUID invocation_id = GUID_zero();
3893                 uint32_t version = 0;
3894                 NTTIME change_time = 0;
3895                 uint32_t rmd_flags = dsdb_dn_rmd_flags(pdn->dsdb_dn->dn);
3896
3897                 dsdb_get_extended_dn_guid(pdn->dsdb_dn->dn, &invocation_id, "RMD_INVOCID");
3898                 dsdb_get_extended_dn_uint32(pdn->dsdb_dn->dn, &version, "RMD_VERSION");
3899                 dsdb_get_extended_dn_nttime(pdn->dsdb_dn->dn, &change_time, "RMD_CHANGETIME");
3900
3901                 if (!replmd_update_is_newer(&invocation_id,
3902                                             &la->meta_data.originating_invocation_id,
3903                                             version,
3904                                             la->meta_data.version,
3905                                             change_time,
3906                                             la->meta_data.originating_change_time)) {
3907                         DEBUG(3,("Discarding older DRS linked attribute update to %s on %s from %s\n",
3908                                  old_el->name, ldb_dn_get_linearized(msg->dn),
3909                                  GUID_string(tmp_ctx, &la->meta_data.originating_invocation_id)));
3910                         talloc_free(tmp_ctx);
3911                         return LDB_SUCCESS;
3912                 }
3913
3914                 /* get a seq_num for this change */
3915                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
3916                 if (ret != LDB_SUCCESS) {
3917                         talloc_free(tmp_ctx);
3918                         return ret;
3919                 }
3920
3921                 if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
3922                         /* remove the existing backlink */
3923                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, false, attr, false);
3924                         if (ret != LDB_SUCCESS) {
3925                                 talloc_free(tmp_ctx);
3926                                 return ret;
3927                         }
3928                 }
3929
3930                 ret = replmd_update_la_val(tmp_ctx, pdn->v, dsdb_dn, pdn->dsdb_dn,
3931                                            &la->meta_data.originating_invocation_id,
3932                                            la->meta_data.originating_usn, seq_num,
3933                                            la->meta_data.originating_change_time,
3934                                            la->meta_data.version,
3935                                            !active);
3936                 if (ret != LDB_SUCCESS) {
3937                         talloc_free(tmp_ctx);
3938                         return ret;
3939                 }
3940
3941                 if (active) {
3942                         /* add the new backlink */
3943                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, true, attr, false);
3944                         if (ret != LDB_SUCCESS) {
3945                                 talloc_free(tmp_ctx);
3946                                 return ret;
3947                         }
3948                 }
3949         } else {
3950                 /* get a seq_num for this change */
3951                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
3952                 if (ret != LDB_SUCCESS) {
3953                         talloc_free(tmp_ctx);
3954                         return ret;
3955                 }
3956
3957                 old_el->values = talloc_realloc(msg->elements, old_el->values,
3958                                                 struct ldb_val, old_el->num_values+1);
3959                 if (!old_el->values) {
3960                         ldb_module_oom(module);
3961                         return LDB_ERR_OPERATIONS_ERROR;
3962                 }
3963                 old_el->num_values++;
3964
3965                 ret = replmd_build_la_val(tmp_ctx, &old_el->values[old_el->num_values-1], dsdb_dn,
3966                                           &la->meta_data.originating_invocation_id,
3967                                           la->meta_data.originating_usn, seq_num,
3968                                           la->meta_data.originating_change_time,
3969                                           la->meta_data.version,
3970                                           (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?false:true);
3971                 if (ret != LDB_SUCCESS) {
3972                         talloc_free(tmp_ctx);
3973                         return ret;
3974                 }
3975
3976                 if (active) {
3977                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid,
3978                                                   true, attr, false);
3979                         if (ret != LDB_SUCCESS) {
3980                                 talloc_free(tmp_ctx);
3981                                 return ret;
3982                         }
3983                 }
3984         }
3985
3986         /* we only change whenChanged and uSNChanged if the seq_num
3987            has changed */
3988         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
3989                 talloc_free(tmp_ctx);
3990                 return LDB_ERR_OPERATIONS_ERROR;
3991         }
3992
3993         if (add_uint64_element(msg, "uSNChanged", seq_num) != LDB_SUCCESS) {
3994                 talloc_free(tmp_ctx);
3995                 return LDB_ERR_OPERATIONS_ERROR;
3996         }
3997
3998         ret = dsdb_check_single_valued_link(attr, old_el);
3999         if (ret != LDB_SUCCESS) {
4000                 talloc_free(tmp_ctx);
4001                 return ret;
4002         }
4003
4004         ret = dsdb_module_modify(module, msg, DSDB_FLAG_NEXT_MODULE | DSDB_MODIFY_RELAX);
4005         if (ret != LDB_SUCCESS) {
4006                 ldb_debug(ldb, LDB_DEBUG_WARNING, "Failed to apply linked attribute change '%s'\n%s\n",
4007                           ldb_errstring(ldb),
4008                           ldb_ldif_message_string(ldb, tmp_ctx, LDB_CHANGETYPE_MODIFY, msg));
4009                 talloc_free(tmp_ctx);
4010                 return ret;
4011         }
4012
4013         talloc_free(tmp_ctx);
4014
4015         return ret;
4016 }
4017
4018 static int replmd_extended(struct ldb_module *module, struct ldb_request *req)
4019 {
4020         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_REPLICATED_OBJECTS_OID) == 0) {
4021                 return replmd_extended_replicated_objects(module, req);
4022         }
4023
4024         return ldb_next_request(module, req);
4025 }
4026
4027
4028 /*
4029   we hook into the transaction operations to allow us to
4030   perform the linked attribute updates at the end of the whole
4031   transaction. This allows a forward linked attribute to be created
4032   before the object is created. During a vampire, w2k8 sends us linked
4033   attributes before the objects they are part of.
4034  */
4035 static int replmd_start_transaction(struct ldb_module *module)
4036 {
4037         /* create our private structure for this transaction */
4038         struct replmd_private *replmd_private = talloc_get_type(ldb_module_get_private(module),
4039                                                                 struct replmd_private);
4040         replmd_txn_cleanup(replmd_private);
4041
4042         /* free any leftover mod_usn records from cancelled
4043            transactions */
4044         while (replmd_private->ncs) {
4045                 struct nc_entry *e = replmd_private->ncs;
4046                 DLIST_REMOVE(replmd_private->ncs, e);
4047                 talloc_free(e);
4048         }
4049
4050         return ldb_next_start_trans(module);
4051 }
4052
4053 /*
4054   on prepare commit we loop over our queued la_context structures and
4055   apply each of them
4056  */
4057 static int replmd_prepare_commit(struct ldb_module *module)
4058 {
4059         struct replmd_private *replmd_private =
4060                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
4061         struct la_entry *la, *prev;
4062         struct la_backlink *bl;
4063         int ret;
4064
4065         /* walk the list backwards, to do the first entry first, as we
4066          * added the entries with DLIST_ADD() which puts them at the
4067          * start of the list */
4068         for (la = DLIST_TAIL(replmd_private->la_list); la; la=prev) {
4069                 prev = DLIST_PREV(la);
4070                 DLIST_REMOVE(replmd_private->la_list, la);
4071                 ret = replmd_process_linked_attribute(module, la);
4072                 if (ret != LDB_SUCCESS) {
4073                         replmd_txn_cleanup(replmd_private);
4074                         return ret;
4075                 }
4076         }
4077
4078         /* process our backlink list, creating and deleting backlinks
4079            as necessary */
4080         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
4081                 ret = replmd_process_backlink(module, bl);
4082                 if (ret != LDB_SUCCESS) {
4083                         replmd_txn_cleanup(replmd_private);
4084                         return ret;
4085                 }
4086         }
4087
4088         replmd_txn_cleanup(replmd_private);
4089
4090         /* possibly change @REPLCHANGED */
4091         ret = replmd_notify_store(module);
4092         if (ret != LDB_SUCCESS) {
4093                 return ret;
4094         }
4095
4096         return ldb_next_prepare_commit(module);
4097 }
4098
4099 static int replmd_del_transaction(struct ldb_module *module)
4100 {
4101         struct replmd_private *replmd_private =
4102                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
4103         replmd_txn_cleanup(replmd_private);
4104
4105         return ldb_next_del_trans(module);
4106 }
4107
4108
4109 _PUBLIC_ const struct ldb_module_ops ldb_repl_meta_data_module_ops = {
4110         .name          = "repl_meta_data",
4111         .init_context      = replmd_init,
4112         .add               = replmd_add,
4113         .modify            = replmd_modify,
4114         .rename            = replmd_rename,
4115         .del               = replmd_delete,
4116         .extended          = replmd_extended,
4117         .start_transaction = replmd_start_transaction,
4118         .prepare_commit    = replmd_prepare_commit,
4119         .del_transaction   = replmd_del_transaction,
4120 };