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                 for (i=0; i<msg->num_elements; i++) {
1250                         struct ldb_message_element *old_el;
1251                         old_el = ldb_msg_find_element(res->msgs[0], msg->elements[i].name);
1252                         ret = replmd_update_rpmd_element(ldb, msg, &msg->elements[i], old_el, &omd, schema, seq_num,
1253                                                          our_invocation_id, now);
1254                         if (ret != LDB_SUCCESS) {
1255                                 return ret;
1256                         }
1257
1258                         if (is_urgent && !*is_urgent && (situation == REPL_URGENT_ON_UPDATE)) {
1259                                 *is_urgent = replmd_check_urgent_attribute(&msg->elements[i]);
1260                         }
1261
1262                 }
1263         }
1264         /*
1265          * replmd_update_rpmd_element has done an update if the
1266          * seq_num is set
1267          */
1268         if (*seq_num != 0) {
1269                 struct ldb_val *md_value;
1270                 struct ldb_message_element *el;
1271
1272                 /*if we are RODC and this is a DRSR update then its ok*/
1273                 if (!ldb_request_get_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
1274                         ret = samdb_rodc(ldb, &rodc);
1275                         if (ret != LDB_SUCCESS) {
1276                                 DEBUG(4, (__location__ ": unable to tell if we are an RODC\n"));
1277                         } else if (rodc) {
1278                                 ldb_asprintf_errstring(ldb, "RODC modify is forbidden\n");
1279                                 return LDB_ERR_REFERRAL;
1280                         }
1281                 }
1282
1283                 md_value = talloc(msg, struct ldb_val);
1284                 if (md_value == NULL) {
1285                         ldb_oom(ldb);
1286                         return LDB_ERR_OPERATIONS_ERROR;
1287                 }
1288
1289                 ret = replmd_replPropertyMetaDataCtr1_sort(&omd.ctr.ctr1, schema, msg->dn);
1290                 if (ret != LDB_SUCCESS) {
1291                         return ret;
1292                 }
1293
1294                 ndr_err = ndr_push_struct_blob(md_value, msg, &omd,
1295                                                (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
1296                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1297                         DEBUG(0,(__location__ ": Failed to marshall replPropertyMetaData for %s\n",
1298                                  ldb_dn_get_linearized(msg->dn)));
1299                         return LDB_ERR_OPERATIONS_ERROR;
1300                 }
1301
1302                 ret = ldb_msg_add_empty(msg, "replPropertyMetaData", LDB_FLAG_MOD_REPLACE, &el);
1303                 if (ret != LDB_SUCCESS) {
1304                         DEBUG(0,(__location__ ": Failed to add updated replPropertyMetaData %s\n",
1305                                  ldb_dn_get_linearized(msg->dn)));
1306                         return ret;
1307                 }
1308
1309                 el->num_values = 1;
1310                 el->values = md_value;
1311         }
1312
1313         return LDB_SUCCESS;
1314 }
1315
1316 struct parsed_dn {
1317         struct dsdb_dn *dsdb_dn;
1318         struct GUID *guid;
1319         struct ldb_val *v;
1320 };
1321
1322 static int parsed_dn_compare(struct parsed_dn *pdn1, struct parsed_dn *pdn2)
1323 {
1324         return GUID_compare(pdn1->guid, pdn2->guid);
1325 }
1326
1327 static struct parsed_dn *parsed_dn_find(struct parsed_dn *pdn, int count, struct GUID *guid, struct ldb_dn *dn)
1328 {
1329         struct parsed_dn *ret;
1330         if (dn && GUID_all_zero(guid)) {
1331                 /* when updating a link using DRS, we sometimes get a
1332                    NULL GUID. We then need to try and match by DN */
1333                 int i;
1334                 for (i=0; i<count; i++) {
1335                         if (ldb_dn_compare(pdn[i].dsdb_dn->dn, dn) == 0) {
1336                                 dsdb_get_extended_dn_guid(pdn[i].dsdb_dn->dn, guid, "GUID");
1337                                 return &pdn[i];
1338                         }
1339                 }
1340                 return NULL;
1341         }
1342         BINARY_ARRAY_SEARCH(pdn, count, guid, guid, GUID_compare, ret);
1343         return ret;
1344 }
1345
1346 /*
1347   get a series of message element values as an array of DNs and GUIDs
1348   the result is sorted by GUID
1349  */
1350 static int get_parsed_dns(struct ldb_module *module, TALLOC_CTX *mem_ctx,
1351                           struct ldb_message_element *el, struct parsed_dn **pdn,
1352                           const char *ldap_oid)
1353 {
1354         unsigned int i;
1355         struct ldb_context *ldb = ldb_module_get_ctx(module);
1356
1357         if (el == NULL) {
1358                 *pdn = NULL;
1359                 return LDB_SUCCESS;
1360         }
1361
1362         (*pdn) = talloc_array(mem_ctx, struct parsed_dn, el->num_values);
1363         if (!*pdn) {
1364                 ldb_module_oom(module);
1365                 return LDB_ERR_OPERATIONS_ERROR;
1366         }
1367
1368         for (i=0; i<el->num_values; i++) {
1369                 struct ldb_val *v = &el->values[i];
1370                 NTSTATUS status;
1371                 struct ldb_dn *dn;
1372                 struct parsed_dn *p;
1373
1374                 p = &(*pdn)[i];
1375
1376                 p->dsdb_dn = dsdb_dn_parse(*pdn, ldb, v, ldap_oid);
1377                 if (p->dsdb_dn == NULL) {
1378                         return LDB_ERR_INVALID_DN_SYNTAX;
1379                 }
1380
1381                 dn = p->dsdb_dn->dn;
1382
1383                 p->guid = talloc(*pdn, struct GUID);
1384                 if (p->guid == NULL) {
1385                         ldb_module_oom(module);
1386                         return LDB_ERR_OPERATIONS_ERROR;
1387                 }
1388
1389                 status = dsdb_get_extended_dn_guid(dn, p->guid, "GUID");
1390                 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1391                         /* we got a DN without a GUID - go find the GUID */
1392                         int ret = dsdb_module_guid_by_dn(module, dn, p->guid);
1393                         if (ret != LDB_SUCCESS) {
1394                                 ldb_asprintf_errstring(ldb, "Unable to find GUID for DN %s\n",
1395                                                        ldb_dn_get_linearized(dn));
1396                                 return ret;
1397                         }
1398                         ret = dsdb_set_extended_dn_guid(dn, p->guid, "GUID");
1399                         if (ret != LDB_SUCCESS) {
1400                                 return ret;
1401                         }
1402                 } else if (!NT_STATUS_IS_OK(status)) {
1403                         return LDB_ERR_OPERATIONS_ERROR;
1404                 }
1405
1406                 /* keep a pointer to the original ldb_val */
1407                 p->v = v;
1408         }
1409
1410         TYPESAFE_QSORT(*pdn, el->num_values, parsed_dn_compare);
1411
1412         return LDB_SUCCESS;
1413 }
1414
1415 /*
1416   build a new extended DN, including all meta data fields
1417
1418   RMD_FLAGS           = DSDB_RMD_FLAG_* bits
1419   RMD_ADDTIME         = originating_add_time
1420   RMD_INVOCID         = originating_invocation_id
1421   RMD_CHANGETIME      = originating_change_time
1422   RMD_ORIGINATING_USN = originating_usn
1423   RMD_LOCAL_USN       = local_usn
1424   RMD_VERSION         = version
1425  */
1426 static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1427                                const struct GUID *invocation_id, uint64_t seq_num,
1428                                uint64_t local_usn, NTTIME nttime, uint32_t version, bool deleted)
1429 {
1430         struct ldb_dn *dn = dsdb_dn->dn;
1431         const char *tstring, *usn_string, *flags_string;
1432         struct ldb_val tval;
1433         struct ldb_val iid;
1434         struct ldb_val usnv, local_usnv;
1435         struct ldb_val vers, flagsv;
1436         NTSTATUS status;
1437         int ret;
1438         const char *dnstring;
1439         char *vstring;
1440         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1441
1442         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1443         if (!tstring) {
1444                 return LDB_ERR_OPERATIONS_ERROR;
1445         }
1446         tval = data_blob_string_const(tstring);
1447
1448         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1449         if (!usn_string) {
1450                 return LDB_ERR_OPERATIONS_ERROR;
1451         }
1452         usnv = data_blob_string_const(usn_string);
1453
1454         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1455         if (!usn_string) {
1456                 return LDB_ERR_OPERATIONS_ERROR;
1457         }
1458         local_usnv = data_blob_string_const(usn_string);
1459
1460         vstring = talloc_asprintf(mem_ctx, "%lu", (unsigned long)version);
1461         if (!vstring) {
1462                 return LDB_ERR_OPERATIONS_ERROR;
1463         }
1464         vers = data_blob_string_const(vstring);
1465
1466         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1467         if (!NT_STATUS_IS_OK(status)) {
1468                 return LDB_ERR_OPERATIONS_ERROR;
1469         }
1470
1471         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1472         if (!flags_string) {
1473                 return LDB_ERR_OPERATIONS_ERROR;
1474         }
1475         flagsv = data_blob_string_const(flags_string);
1476
1477         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1478         if (ret != LDB_SUCCESS) return ret;
1479         ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", &tval);
1480         if (ret != LDB_SUCCESS) return ret;
1481         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1482         if (ret != LDB_SUCCESS) return ret;
1483         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1484         if (ret != LDB_SUCCESS) return ret;
1485         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1486         if (ret != LDB_SUCCESS) return ret;
1487         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1488         if (ret != LDB_SUCCESS) return ret;
1489         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1490         if (ret != LDB_SUCCESS) return ret;
1491
1492         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1493         if (dnstring == NULL) {
1494                 return LDB_ERR_OPERATIONS_ERROR;
1495         }
1496         *v = data_blob_string_const(dnstring);
1497
1498         return LDB_SUCCESS;
1499 }
1500
1501 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1502                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1503                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1504                                 uint32_t version, bool deleted);
1505
1506 /*
1507   check if any links need upgrading from w2k format
1508
1509   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.
1510  */
1511 static int replmd_check_upgrade_links(struct parsed_dn *dns, uint32_t count, struct ldb_message_element *parent_ctx, const struct GUID *invocation_id)
1512 {
1513         uint32_t i;
1514         for (i=0; i<count; i++) {
1515                 NTSTATUS status;
1516                 uint32_t version;
1517                 int ret;
1518
1519                 status = dsdb_get_extended_dn_uint32(dns[i].dsdb_dn->dn, &version, "RMD_VERSION");
1520                 if (!NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1521                         continue;
1522                 }
1523
1524                 /* it's an old one that needs upgrading */
1525                 ret = replmd_update_la_val(parent_ctx->values, dns[i].v, dns[i].dsdb_dn, dns[i].dsdb_dn, invocation_id,
1526                                            1, 1, 0, 0, false);
1527                 if (ret != LDB_SUCCESS) {
1528                         return ret;
1529                 }
1530         }
1531         return LDB_SUCCESS;
1532 }
1533
1534 /*
1535   update an extended DN, including all meta data fields
1536
1537   see replmd_build_la_val for value names
1538  */
1539 static int replmd_update_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct dsdb_dn *dsdb_dn,
1540                                 struct dsdb_dn *old_dsdb_dn, const struct GUID *invocation_id,
1541                                 uint64_t seq_num, uint64_t local_usn, NTTIME nttime,
1542                                 uint32_t version, bool deleted)
1543 {
1544         struct ldb_dn *dn = dsdb_dn->dn;
1545         const char *tstring, *usn_string, *flags_string;
1546         struct ldb_val tval;
1547         struct ldb_val iid;
1548         struct ldb_val usnv, local_usnv;
1549         struct ldb_val vers, flagsv;
1550         const struct ldb_val *old_addtime;
1551         uint32_t old_version;
1552         NTSTATUS status;
1553         int ret;
1554         const char *dnstring;
1555         char *vstring;
1556         uint32_t rmd_flags = deleted?DSDB_RMD_FLAG_DELETED:0;
1557
1558         tstring = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)nttime);
1559         if (!tstring) {
1560                 return LDB_ERR_OPERATIONS_ERROR;
1561         }
1562         tval = data_blob_string_const(tstring);
1563
1564         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)seq_num);
1565         if (!usn_string) {
1566                 return LDB_ERR_OPERATIONS_ERROR;
1567         }
1568         usnv = data_blob_string_const(usn_string);
1569
1570         usn_string = talloc_asprintf(mem_ctx, "%llu", (unsigned long long)local_usn);
1571         if (!usn_string) {
1572                 return LDB_ERR_OPERATIONS_ERROR;
1573         }
1574         local_usnv = data_blob_string_const(usn_string);
1575
1576         status = GUID_to_ndr_blob(invocation_id, dn, &iid);
1577         if (!NT_STATUS_IS_OK(status)) {
1578                 return LDB_ERR_OPERATIONS_ERROR;
1579         }
1580
1581         flags_string = talloc_asprintf(mem_ctx, "%u", rmd_flags);
1582         if (!flags_string) {
1583                 return LDB_ERR_OPERATIONS_ERROR;
1584         }
1585         flagsv = data_blob_string_const(flags_string);
1586
1587         ret = ldb_dn_set_extended_component(dn, "RMD_FLAGS", &flagsv);
1588         if (ret != LDB_SUCCESS) return ret;
1589
1590         /* get the ADDTIME from the original */
1591         old_addtime = ldb_dn_get_extended_component(old_dsdb_dn->dn, "RMD_ADDTIME");
1592         if (old_addtime == NULL) {
1593                 old_addtime = &tval;
1594         }
1595         if (dsdb_dn != old_dsdb_dn) {
1596                 ret = ldb_dn_set_extended_component(dn, "RMD_ADDTIME", old_addtime);
1597                 if (ret != LDB_SUCCESS) return ret;
1598         }
1599
1600         /* use our invocation id */
1601         ret = ldb_dn_set_extended_component(dn, "RMD_INVOCID", &iid);
1602         if (ret != LDB_SUCCESS) return ret;
1603
1604         /* changetime is the current time */
1605         ret = ldb_dn_set_extended_component(dn, "RMD_CHANGETIME", &tval);
1606         if (ret != LDB_SUCCESS) return ret;
1607
1608         /* update the USN */
1609         ret = ldb_dn_set_extended_component(dn, "RMD_ORIGINATING_USN", &usnv);
1610         if (ret != LDB_SUCCESS) return ret;
1611
1612         ret = ldb_dn_set_extended_component(dn, "RMD_LOCAL_USN", &local_usnv);
1613         if (ret != LDB_SUCCESS) return ret;
1614
1615         /* increase the version by 1 */
1616         status = dsdb_get_extended_dn_uint32(old_dsdb_dn->dn, &old_version, "RMD_VERSION");
1617         if (NT_STATUS_IS_OK(status) && old_version >= version) {
1618                 version = old_version+1;
1619         }
1620         vstring = talloc_asprintf(dn, "%lu", (unsigned long)version);
1621         vers = data_blob_string_const(vstring);
1622         ret = ldb_dn_set_extended_component(dn, "RMD_VERSION", &vers);
1623         if (ret != LDB_SUCCESS) return ret;
1624
1625         dnstring = dsdb_dn_get_extended_linearized(mem_ctx, dsdb_dn, 1);
1626         if (dnstring == NULL) {
1627                 return LDB_ERR_OPERATIONS_ERROR;
1628         }
1629         *v = data_blob_string_const(dnstring);
1630
1631         return LDB_SUCCESS;
1632 }
1633
1634 /*
1635   handle adding a linked attribute
1636  */
1637 static int replmd_modify_la_add(struct ldb_module *module,
1638                                 const struct dsdb_schema *schema,
1639                                 struct ldb_message *msg,
1640                                 struct ldb_message_element *el,
1641                                 struct ldb_message_element *old_el,
1642                                 const struct dsdb_attribute *schema_attr,
1643                                 uint64_t seq_num,
1644                                 time_t t,
1645                                 struct GUID *msg_guid)
1646 {
1647         unsigned int i;
1648         struct parsed_dn *dns, *old_dns;
1649         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1650         int ret;
1651         struct ldb_val *new_values = NULL;
1652         unsigned int num_new_values = 0;
1653         unsigned old_num_values = old_el?old_el->num_values:0;
1654         const struct GUID *invocation_id;
1655         struct ldb_context *ldb = ldb_module_get_ctx(module);
1656         NTTIME now;
1657
1658         unix_to_nt_time(&now, t);
1659
1660         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1661         if (ret != LDB_SUCCESS) {
1662                 talloc_free(tmp_ctx);
1663                 return ret;
1664         }
1665
1666         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1667         if (ret != LDB_SUCCESS) {
1668                 talloc_free(tmp_ctx);
1669                 return ret;
1670         }
1671
1672         invocation_id = samdb_ntds_invocation_id(ldb);
1673         if (!invocation_id) {
1674                 talloc_free(tmp_ctx);
1675                 return LDB_ERR_OPERATIONS_ERROR;
1676         }
1677
1678         ret = replmd_check_upgrade_links(old_dns, old_num_values, old_el, invocation_id);
1679         if (ret != LDB_SUCCESS) {
1680                 talloc_free(tmp_ctx);
1681                 return ret;
1682         }
1683
1684         /* for each new value, see if it exists already with the same GUID */
1685         for (i=0; i<el->num_values; i++) {
1686                 struct parsed_dn *p = parsed_dn_find(old_dns, old_num_values, dns[i].guid, NULL);
1687                 if (p == NULL) {
1688                         /* this is a new linked attribute value */
1689                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val, num_new_values+1);
1690                         if (new_values == NULL) {
1691                                 ldb_module_oom(module);
1692                                 talloc_free(tmp_ctx);
1693                                 return LDB_ERR_OPERATIONS_ERROR;
1694                         }
1695                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1696                                                   invocation_id, seq_num, seq_num, now, 0, false);
1697                         if (ret != LDB_SUCCESS) {
1698                                 talloc_free(tmp_ctx);
1699                                 return ret;
1700                         }
1701                         num_new_values++;
1702                 } else {
1703                         /* this is only allowed if the GUID was
1704                            previously deleted. */
1705                         uint32_t rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1706
1707                         if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
1708                                 ldb_asprintf_errstring(ldb, "Attribute %s already exists for target GUID %s",
1709                                                        el->name, GUID_string(tmp_ctx, p->guid));
1710                                 talloc_free(tmp_ctx);
1711                                 return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
1712                         }
1713                         ret = replmd_update_la_val(old_el->values, p->v, dns[i].dsdb_dn, p->dsdb_dn,
1714                                                    invocation_id, seq_num, seq_num, now, 0, false);
1715                         if (ret != LDB_SUCCESS) {
1716                                 talloc_free(tmp_ctx);
1717                                 return ret;
1718                         }
1719                 }
1720
1721                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, true);
1722                 if (ret != LDB_SUCCESS) {
1723                         talloc_free(tmp_ctx);
1724                         return ret;
1725                 }
1726         }
1727
1728         /* add the new ones on to the end of the old values, constructing a new el->values */
1729         el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
1730                                     struct ldb_val,
1731                                     old_num_values+num_new_values);
1732         if (el->values == NULL) {
1733                 ldb_module_oom(module);
1734                 return LDB_ERR_OPERATIONS_ERROR;
1735         }
1736
1737         memcpy(&el->values[old_num_values], new_values, num_new_values*sizeof(struct ldb_val));
1738         el->num_values = old_num_values + num_new_values;
1739
1740         talloc_steal(msg->elements, el->values);
1741         talloc_steal(el->values, new_values);
1742
1743         talloc_free(tmp_ctx);
1744
1745         /* we now tell the backend to replace all existing values
1746            with the one we have constructed */
1747         el->flags = LDB_FLAG_MOD_REPLACE;
1748
1749         return LDB_SUCCESS;
1750 }
1751
1752
1753 /*
1754   handle deleting all active linked attributes
1755  */
1756 static int replmd_modify_la_delete(struct ldb_module *module,
1757                                    const struct dsdb_schema *schema,
1758                                    struct ldb_message *msg,
1759                                    struct ldb_message_element *el,
1760                                    struct ldb_message_element *old_el,
1761                                    const struct dsdb_attribute *schema_attr,
1762                                    uint64_t seq_num,
1763                                    time_t t,
1764                                    struct GUID *msg_guid)
1765 {
1766         unsigned int i;
1767         struct parsed_dn *dns, *old_dns;
1768         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1769         int ret;
1770         const struct GUID *invocation_id;
1771         struct ldb_context *ldb = ldb_module_get_ctx(module);
1772         NTTIME now;
1773
1774         unix_to_nt_time(&now, t);
1775
1776         /* check if there is nothing to delete */
1777         if ((!old_el || old_el->num_values == 0) &&
1778             el->num_values == 0) {
1779                 return LDB_SUCCESS;
1780         }
1781
1782         if (!old_el || old_el->num_values == 0) {
1783                 return LDB_ERR_NO_SUCH_ATTRIBUTE;
1784         }
1785
1786         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1787         if (ret != LDB_SUCCESS) {
1788                 talloc_free(tmp_ctx);
1789                 return ret;
1790         }
1791
1792         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1793         if (ret != LDB_SUCCESS) {
1794                 talloc_free(tmp_ctx);
1795                 return ret;
1796         }
1797
1798         invocation_id = samdb_ntds_invocation_id(ldb);
1799         if (!invocation_id) {
1800                 return LDB_ERR_OPERATIONS_ERROR;
1801         }
1802
1803         ret = replmd_check_upgrade_links(old_dns, old_el->num_values, old_el, invocation_id);
1804         if (ret != LDB_SUCCESS) {
1805                 talloc_free(tmp_ctx);
1806                 return ret;
1807         }
1808
1809         el->values = NULL;
1810
1811         /* see if we are being asked to delete any links that
1812            don't exist or are already deleted */
1813         for (i=0; i<el->num_values; i++) {
1814                 struct parsed_dn *p = &dns[i];
1815                 struct parsed_dn *p2;
1816                 uint32_t rmd_flags;
1817
1818                 p2 = parsed_dn_find(old_dns, old_el->num_values, p->guid, NULL);
1819                 if (!p2) {
1820                         ldb_asprintf_errstring(ldb, "Attribute %s doesn't exist for target GUID %s",
1821                                                el->name, GUID_string(tmp_ctx, p->guid));
1822                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1823                 }
1824                 rmd_flags = dsdb_dn_rmd_flags(p2->dsdb_dn->dn);
1825                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) {
1826                         ldb_asprintf_errstring(ldb, "Attribute %s already deleted for target GUID %s",
1827                                                el->name, GUID_string(tmp_ctx, p->guid));
1828                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
1829                 }
1830         }
1831
1832         /* for each new value, see if it exists already with the same GUID
1833            if it is not already deleted and matches the delete list then delete it
1834         */
1835         for (i=0; i<old_el->num_values; i++) {
1836                 struct parsed_dn *p = &old_dns[i];
1837                 uint32_t rmd_flags;
1838
1839                 if (el->num_values && parsed_dn_find(dns, el->num_values, p->guid, NULL) == NULL) {
1840                         continue;
1841                 }
1842
1843                 rmd_flags = dsdb_dn_rmd_flags(p->dsdb_dn->dn);
1844                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1845
1846                 ret = replmd_update_la_val(old_el->values, p->v, p->dsdb_dn, p->dsdb_dn,
1847                                            invocation_id, seq_num, seq_num, now, 0, true);
1848                 if (ret != LDB_SUCCESS) {
1849                         talloc_free(tmp_ctx);
1850                         return ret;
1851                 }
1852
1853                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, true);
1854                 if (ret != LDB_SUCCESS) {
1855                         talloc_free(tmp_ctx);
1856                         return ret;
1857                 }
1858         }
1859
1860         el->values = talloc_steal(msg->elements, old_el->values);
1861         el->num_values = old_el->num_values;
1862
1863         talloc_free(tmp_ctx);
1864
1865         /* we now tell the backend to replace all existing values
1866            with the one we have constructed */
1867         el->flags = LDB_FLAG_MOD_REPLACE;
1868
1869         return LDB_SUCCESS;
1870 }
1871
1872 /*
1873   handle replacing a linked attribute
1874  */
1875 static int replmd_modify_la_replace(struct ldb_module *module,
1876                                     const struct dsdb_schema *schema,
1877                                     struct ldb_message *msg,
1878                                     struct ldb_message_element *el,
1879                                     struct ldb_message_element *old_el,
1880                                     const struct dsdb_attribute *schema_attr,
1881                                     uint64_t seq_num,
1882                                     time_t t,
1883                                     struct GUID *msg_guid)
1884 {
1885         unsigned int i;
1886         struct parsed_dn *dns, *old_dns;
1887         TALLOC_CTX *tmp_ctx = talloc_new(msg);
1888         int ret;
1889         const struct GUID *invocation_id;
1890         struct ldb_context *ldb = ldb_module_get_ctx(module);
1891         struct ldb_val *new_values = NULL;
1892         unsigned int num_new_values = 0;
1893         unsigned int old_num_values = old_el?old_el->num_values:0;
1894         NTTIME now;
1895
1896         unix_to_nt_time(&now, t);
1897
1898         /* check if there is nothing to replace */
1899         if ((!old_el || old_el->num_values == 0) &&
1900             el->num_values == 0) {
1901                 return LDB_SUCCESS;
1902         }
1903
1904         ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
1905         if (ret != LDB_SUCCESS) {
1906                 talloc_free(tmp_ctx);
1907                 return ret;
1908         }
1909
1910         ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
1911         if (ret != LDB_SUCCESS) {
1912                 talloc_free(tmp_ctx);
1913                 return ret;
1914         }
1915
1916         invocation_id = samdb_ntds_invocation_id(ldb);
1917         if (!invocation_id) {
1918                 return LDB_ERR_OPERATIONS_ERROR;
1919         }
1920
1921         ret = replmd_check_upgrade_links(old_dns, old_num_values, old_el, invocation_id);
1922         if (ret != LDB_SUCCESS) {
1923                 talloc_free(tmp_ctx);
1924                 return ret;
1925         }
1926
1927         /* mark all the old ones as deleted */
1928         for (i=0; i<old_num_values; i++) {
1929                 struct parsed_dn *old_p = &old_dns[i];
1930                 struct parsed_dn *p;
1931                 uint32_t rmd_flags = dsdb_dn_rmd_flags(old_p->dsdb_dn->dn);
1932
1933                 if (rmd_flags & DSDB_RMD_FLAG_DELETED) continue;
1934
1935                 ret = replmd_add_backlink(module, schema, msg_guid, old_dns[i].guid, false, schema_attr, false);
1936                 if (ret != LDB_SUCCESS) {
1937                         talloc_free(tmp_ctx);
1938                         return ret;
1939                 }
1940
1941                 p = parsed_dn_find(dns, el->num_values, old_p->guid, NULL);
1942                 if (p) {
1943                         /* we don't delete it if we are re-adding it */
1944                         continue;
1945                 }
1946
1947                 ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn, old_p->dsdb_dn,
1948                                            invocation_id, seq_num, seq_num, now, 0, true);
1949                 if (ret != LDB_SUCCESS) {
1950                         talloc_free(tmp_ctx);
1951                         return ret;
1952                 }
1953         }
1954
1955         /* for each new value, either update its meta-data, or add it
1956          * to old_el
1957         */
1958         for (i=0; i<el->num_values; i++) {
1959                 struct parsed_dn *p = &dns[i], *old_p;
1960
1961                 if (old_dns &&
1962                     (old_p = parsed_dn_find(old_dns,
1963                                             old_num_values, p->guid, NULL)) != NULL) {
1964                         /* update in place */
1965                         ret = replmd_update_la_val(old_el->values, old_p->v, old_p->dsdb_dn,
1966                                                    old_p->dsdb_dn, invocation_id,
1967                                                    seq_num, seq_num, now, 0, false);
1968                         if (ret != LDB_SUCCESS) {
1969                                 talloc_free(tmp_ctx);
1970                                 return ret;
1971                         }
1972                 } else {
1973                         /* add a new one */
1974                         new_values = talloc_realloc(tmp_ctx, new_values, struct ldb_val,
1975                                                     num_new_values+1);
1976                         if (new_values == NULL) {
1977                                 ldb_module_oom(module);
1978                                 talloc_free(tmp_ctx);
1979                                 return LDB_ERR_OPERATIONS_ERROR;
1980                         }
1981                         ret = replmd_build_la_val(new_values, &new_values[num_new_values], dns[i].dsdb_dn,
1982                                                   invocation_id, seq_num, seq_num, now, 0, false);
1983                         if (ret != LDB_SUCCESS) {
1984                                 talloc_free(tmp_ctx);
1985                                 return ret;
1986                         }
1987                         num_new_values++;
1988                 }
1989
1990                 ret = replmd_add_backlink(module, schema, msg_guid, dns[i].guid, true, schema_attr, false);
1991                 if (ret != LDB_SUCCESS) {
1992                         talloc_free(tmp_ctx);
1993                         return ret;
1994                 }
1995         }
1996
1997         /* add the new values to the end of old_el */
1998         if (num_new_values != 0) {
1999                 el->values = talloc_realloc(msg->elements, old_el?old_el->values:NULL,
2000                                             struct ldb_val, old_num_values+num_new_values);
2001                 if (el->values == NULL) {
2002                         ldb_module_oom(module);
2003                         return LDB_ERR_OPERATIONS_ERROR;
2004                 }
2005                 memcpy(&el->values[old_num_values], &new_values[0],
2006                        sizeof(struct ldb_val)*num_new_values);
2007                 el->num_values = old_num_values + num_new_values;
2008                 talloc_steal(msg->elements, new_values);
2009         } else {
2010                 el->values = old_el->values;
2011                 el->num_values = old_el->num_values;
2012                 talloc_steal(msg->elements, el->values);
2013         }
2014
2015         talloc_free(tmp_ctx);
2016
2017         /* we now tell the backend to replace all existing values
2018            with the one we have constructed */
2019         el->flags = LDB_FLAG_MOD_REPLACE;
2020
2021         return LDB_SUCCESS;
2022 }
2023
2024
2025 /*
2026   handle linked attributes in modify requests
2027  */
2028 static int replmd_modify_handle_linked_attribs(struct ldb_module *module,
2029                                                struct ldb_message *msg,
2030                                                uint64_t seq_num, time_t t)
2031 {
2032         struct ldb_result *res;
2033         unsigned int i;
2034         int ret;
2035         struct ldb_context *ldb = ldb_module_get_ctx(module);
2036         struct ldb_message *old_msg;
2037
2038         const struct dsdb_schema *schema;
2039         struct GUID old_guid;
2040
2041         if (seq_num == 0) {
2042                 /* there the replmd_update_rpmd code has already
2043                  * checked and saw that there are no linked
2044                  * attributes */
2045                 return LDB_SUCCESS;
2046         }
2047
2048         if (dsdb_functional_level(ldb) == DS_DOMAIN_FUNCTION_2000) {
2049                 /* don't do anything special for linked attributes */
2050                 return LDB_SUCCESS;
2051         }
2052
2053         ret = dsdb_module_search_dn(module, msg, &res, msg->dn, NULL,
2054                                     DSDB_FLAG_NEXT_MODULE |
2055                                     DSDB_SEARCH_SHOW_DELETED |
2056                                     DSDB_SEARCH_REVEAL_INTERNALS |
2057                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
2058         if (ret != LDB_SUCCESS) {
2059                 return ret;
2060         }
2061         schema = dsdb_get_schema(ldb, res);
2062         if (!schema) {
2063                 return LDB_ERR_OPERATIONS_ERROR;
2064         }
2065
2066         old_msg = res->msgs[0];
2067
2068         old_guid = samdb_result_guid(old_msg, "objectGUID");
2069
2070         for (i=0; i<msg->num_elements; i++) {
2071                 struct ldb_message_element *el = &msg->elements[i];
2072                 struct ldb_message_element *old_el, *new_el;
2073                 const struct dsdb_attribute *schema_attr
2074                         = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
2075                 if (!schema_attr) {
2076                         ldb_asprintf_errstring(ldb,
2077                                                "attribute %s is not a valid attribute in schema", el->name);
2078                         return LDB_ERR_OBJECT_CLASS_VIOLATION;
2079                 }
2080                 if (schema_attr->linkID == 0) {
2081                         continue;
2082                 }
2083                 if ((schema_attr->linkID & 1) == 1) {
2084                         /* Odd is for the target.  Illegal to modify */
2085                         ldb_asprintf_errstring(ldb,
2086                                                "attribute %s must not be modified directly, it is a linked attribute", el->name);
2087                         return LDB_ERR_UNWILLING_TO_PERFORM;
2088                 }
2089                 old_el = ldb_msg_find_element(old_msg, el->name);
2090                 switch (el->flags & LDB_FLAG_MOD_MASK) {
2091                 case LDB_FLAG_MOD_REPLACE:
2092                         ret = replmd_modify_la_replace(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
2093                         break;
2094                 case LDB_FLAG_MOD_DELETE:
2095                         ret = replmd_modify_la_delete(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
2096                         break;
2097                 case LDB_FLAG_MOD_ADD:
2098                         ret = replmd_modify_la_add(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
2099                         break;
2100                 default:
2101                         ldb_asprintf_errstring(ldb,
2102                                                "invalid flags 0x%x for %s linked attribute",
2103                                                el->flags, el->name);
2104                         return LDB_ERR_UNWILLING_TO_PERFORM;
2105                 }
2106                 if (ret != LDB_SUCCESS) {
2107                         return ret;
2108                 }
2109                 if (old_el) {
2110                         ldb_msg_remove_attr(old_msg, el->name);
2111                 }
2112                 ldb_msg_add_empty(old_msg, el->name, 0, &new_el);
2113                 new_el->num_values = el->num_values;
2114                 new_el->values = talloc_steal(msg->elements, el->values);
2115
2116                 /* TODO: this relises a bit too heavily on the exact
2117                    behaviour of ldb_msg_find_element and
2118                    ldb_msg_remove_element */
2119                 old_el = ldb_msg_find_element(msg, el->name);
2120                 if (old_el != el) {
2121                         ldb_msg_remove_element(msg, old_el);
2122                         i--;
2123                 }
2124         }
2125
2126         talloc_free(res);
2127         return ret;
2128 }
2129
2130
2131
2132 static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
2133 {
2134         struct ldb_context *ldb;
2135         struct replmd_replicated_request *ac;
2136         struct ldb_request *down_req;
2137         struct ldb_message *msg;
2138         time_t t = time(NULL);
2139         int ret;
2140         bool is_urgent = false;
2141         struct loadparm_context *lp_ctx;
2142         char *referral;
2143         unsigned int functional_level;
2144
2145         /* do not manipulate our control entries */
2146         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2147                 return ldb_next_request(module, req);
2148         }
2149
2150         ldb = ldb_module_get_ctx(module);
2151         functional_level = dsdb_functional_level(ldb);
2152
2153         lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
2154                                  struct loadparm_context);
2155
2156         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_modify\n");
2157
2158         ac = replmd_ctx_init(module, req);
2159         if (!ac) {
2160                 return LDB_ERR_OPERATIONS_ERROR;
2161         }
2162
2163         /* we have to copy the message as the caller might have it as a const */
2164         msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
2165         if (msg == NULL) {
2166                 ldb_oom(ldb);
2167                 talloc_free(ac);
2168                 return LDB_ERR_OPERATIONS_ERROR;
2169         }
2170
2171         ldb_msg_remove_attr(msg, "whenChanged");
2172         ldb_msg_remove_attr(msg, "uSNChanged");
2173
2174         ret = replmd_update_rpmd(module, ac->schema, req, msg, &ac->seq_num, t, &is_urgent);
2175         if (ret == LDB_ERR_REFERRAL) {
2176                 referral = talloc_asprintf(req,
2177                                            "ldap://%s/%s",
2178                                            lpcfg_dnsdomain(lp_ctx),
2179                                            ldb_dn_get_linearized(msg->dn));
2180                 ret = ldb_module_send_referral(req, referral);
2181                 talloc_free(ac);
2182                 return ldb_module_done(req, NULL, NULL, ret);
2183         }
2184
2185         if (ret != LDB_SUCCESS) {
2186                 talloc_free(ac);
2187                 return ret;
2188         }
2189
2190         ret = replmd_modify_handle_linked_attribs(module, msg, ac->seq_num, t);
2191         if (ret != LDB_SUCCESS) {
2192                 talloc_free(ac);
2193                 return ret;
2194         }
2195
2196         /* TODO:
2197          * - replace the old object with the newly constructed one
2198          */
2199
2200         ac->is_urgent = is_urgent;
2201
2202         ret = ldb_build_mod_req(&down_req, ldb, ac,
2203                                 msg,
2204                                 req->controls,
2205                                 ac, replmd_op_callback,
2206                                 req);
2207         if (ret != LDB_SUCCESS) {
2208                 talloc_free(ac);
2209                 return ret;
2210         }
2211
2212         /* If we are in functional level 2000, then
2213          * replmd_modify_handle_linked_attribs will have done
2214          * nothing */
2215         if (functional_level == DS_DOMAIN_FUNCTION_2000) {
2216                 ret = ldb_request_add_control(down_req, DSDB_CONTROL_APPLY_LINKS, false, NULL);
2217                 if (ret != LDB_SUCCESS) {
2218                         talloc_free(ac);
2219                         return ret;
2220                 }
2221         }
2222
2223         talloc_steal(down_req, msg);
2224
2225         /* we only change whenChanged and uSNChanged if the seq_num
2226            has changed */
2227         if (ac->seq_num != 0) {
2228                 if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
2229                         talloc_free(ac);
2230                         return ret;
2231                 }
2232
2233                 if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
2234                         talloc_free(ac);
2235                         return ret;
2236                 }
2237         }
2238
2239         /* go on with the call chain */
2240         return ldb_next_request(module, down_req);
2241 }
2242
2243 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares);
2244
2245 /*
2246   handle a rename request
2247
2248   On a rename we need to do an extra ldb_modify which sets the
2249   whenChanged and uSNChanged attributes.  We do this in a callback after the success.
2250  */
2251 static int replmd_rename(struct ldb_module *module, struct ldb_request *req)
2252 {
2253         struct ldb_context *ldb;
2254         struct replmd_replicated_request *ac;
2255         int ret;
2256         struct ldb_request *down_req;
2257
2258         /* do not manipulate our control entries */
2259         if (ldb_dn_is_special(req->op.mod.message->dn)) {
2260                 return ldb_next_request(module, req);
2261         }
2262
2263         ldb = ldb_module_get_ctx(module);
2264
2265         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_rename\n");
2266
2267         ac = replmd_ctx_init(module, req);
2268         if (!ac) {
2269                 return LDB_ERR_OPERATIONS_ERROR;
2270         }
2271         ret = ldb_build_rename_req(&down_req, ldb, ac,
2272                                    ac->req->op.rename.olddn,
2273                                    ac->req->op.rename.newdn,
2274                                    ac->req->controls,
2275                                    ac, replmd_rename_callback,
2276                                    ac->req);
2277
2278         if (ret != LDB_SUCCESS) {
2279                 talloc_free(ac);
2280                 return ret;
2281         }
2282
2283         /* go on with the call chain */
2284         return ldb_next_request(module, down_req);
2285 }
2286
2287 /* After the rename is compleated, update the whenchanged etc */
2288 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares)
2289 {
2290         struct ldb_context *ldb;
2291         struct replmd_replicated_request *ac;
2292         struct ldb_request *down_req;
2293         struct ldb_message *msg;
2294         time_t t = time(NULL);
2295         int ret;
2296
2297         ac = talloc_get_type(req->context, struct replmd_replicated_request);
2298         ldb = ldb_module_get_ctx(ac->module);
2299
2300         if (ares->error != LDB_SUCCESS) {
2301                 return ldb_module_done(ac->req, ares->controls,
2302                                         ares->response, ares->error);
2303         }
2304
2305         if (ares->type != LDB_REPLY_DONE) {
2306                 ldb_set_errstring(ldb,
2307                                   "invalid ldb_reply_type in callback");
2308                 talloc_free(ares);
2309                 return ldb_module_done(ac->req, NULL, NULL,
2310                                         LDB_ERR_OPERATIONS_ERROR);
2311         }
2312
2313         /* Get a sequence number from the backend */
2314         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
2315         if (ret != LDB_SUCCESS) {
2316                 return ret;
2317         }
2318
2319         /* TODO:
2320          * - replace the old object with the newly constructed one
2321          */
2322
2323         msg = ldb_msg_new(ac);
2324         if (msg == NULL) {
2325                 ldb_oom(ldb);
2326                 return LDB_ERR_OPERATIONS_ERROR;
2327         }
2328
2329         msg->dn = ac->req->op.rename.newdn;
2330
2331         ret = ldb_build_mod_req(&down_req, ldb, ac,
2332                                 msg,
2333                                 req->controls,
2334                                 ac, replmd_op_callback,
2335                                 req);
2336
2337         if (ret != LDB_SUCCESS) {
2338                 talloc_free(ac);
2339                 return ret;
2340         }
2341         talloc_steal(down_req, msg);
2342
2343         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
2344                 talloc_free(ac);
2345                 return ret;
2346         }
2347
2348         if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
2349                 talloc_free(ac);
2350                 return ret;
2351         }
2352
2353         /* go on with the call chain - do the modify after the rename */
2354         return ldb_next_request(ac->module, down_req);
2355 }
2356
2357 /*
2358    remove links from objects that point at this object when an object
2359    is deleted
2360  */
2361 static int replmd_delete_remove_link(struct ldb_module *module,
2362                                      const struct dsdb_schema *schema,
2363                                      struct ldb_dn *dn,
2364                                      struct ldb_message_element *el,
2365                                      const struct dsdb_attribute *sa)
2366 {
2367         unsigned int i;
2368         TALLOC_CTX *tmp_ctx = talloc_new(module);
2369         struct ldb_context *ldb = ldb_module_get_ctx(module);
2370
2371         for (i=0; i<el->num_values; i++) {
2372                 struct dsdb_dn *dsdb_dn;
2373                 NTSTATUS status;
2374                 int ret;
2375                 struct GUID guid2;
2376                 struct ldb_message *msg;
2377                 const struct dsdb_attribute *target_attr;
2378                 struct ldb_message_element *el2;
2379                 struct ldb_val dn_val;
2380
2381                 if (dsdb_dn_is_deleted_val(&el->values[i])) {
2382                         continue;
2383                 }
2384
2385                 dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &el->values[i], sa->syntax->ldap_oid);
2386                 if (!dsdb_dn) {
2387                         talloc_free(tmp_ctx);
2388                         return LDB_ERR_OPERATIONS_ERROR;
2389                 }
2390
2391                 status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid2, "GUID");
2392                 if (!NT_STATUS_IS_OK(status)) {
2393                         talloc_free(tmp_ctx);
2394                         return LDB_ERR_OPERATIONS_ERROR;
2395                 }
2396
2397                 /* remove the link */
2398                 msg = ldb_msg_new(tmp_ctx);
2399                 if (!msg) {
2400                         ldb_module_oom(module);
2401                         talloc_free(tmp_ctx);
2402                         return LDB_ERR_OPERATIONS_ERROR;
2403                 }
2404
2405
2406                 msg->dn = dsdb_dn->dn;
2407
2408                 target_attr = dsdb_attribute_by_linkID(schema, sa->linkID ^ 1);
2409                 if (target_attr == NULL) {
2410                         continue;
2411                 }
2412
2413                 ret = ldb_msg_add_empty(msg, target_attr->lDAPDisplayName, LDB_FLAG_MOD_DELETE, &el2);
2414                 if (ret != LDB_SUCCESS) {
2415                         ldb_module_oom(module);
2416                         talloc_free(tmp_ctx);
2417                         return LDB_ERR_OPERATIONS_ERROR;
2418                 }
2419                 dn_val = data_blob_string_const(ldb_dn_get_linearized(dn));
2420                 el2->values = &dn_val;
2421                 el2->num_values = 1;
2422
2423                 ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE);
2424                 if (ret != LDB_SUCCESS) {
2425                         talloc_free(tmp_ctx);
2426                         return ret;
2427                 }
2428         }
2429         talloc_free(tmp_ctx);
2430         return LDB_SUCCESS;
2431 }
2432
2433
2434 /*
2435   handle update of replication meta data for deletion of objects
2436
2437   This also handles the mapping of delete to a rename operation
2438   to allow deletes to be replicated.
2439  */
2440 static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
2441 {
2442         int ret = LDB_ERR_OTHER;
2443         bool retb;
2444         struct ldb_dn *old_dn, *new_dn;
2445         const char *rdn_name;
2446         const struct ldb_val *rdn_value, *new_rdn_value;
2447         struct GUID guid;
2448         struct ldb_context *ldb = ldb_module_get_ctx(module);
2449         const struct dsdb_schema *schema;
2450         struct ldb_message *msg, *old_msg;
2451         struct ldb_message_element *el;
2452         TALLOC_CTX *tmp_ctx;
2453         struct ldb_result *res, *parent_res;
2454         const char *preserved_attrs[] = {
2455                 /* yes, this really is a hard coded list. See MS-ADTS
2456                    section 3.1.1.5.5.1.1 */
2457                 "nTSecurityDescriptor", "attributeID", "attributeSyntax", "dNReferenceUpdate", "dNSHostName",
2458                 "flatName", "governsID", "groupType", "instanceType", "lDAPDisplayName", "legacyExchangeDN",
2459                 "isDeleted", "isRecycled", "lastKnownParent", "msDS-LastKnownRDN", "mS-DS-CreatorSID",
2460                 "mSMQOwnerID", "nCName", "objectClass", "distinguishedName", "objectGUID", "objectSid",
2461                 "oMSyntax", "proxiedObjectName", "name", "replPropertyMetaData", "sAMAccountName",
2462                 "securityIdentifier", "sIDHistory", "subClassOf", "systemFlags", "trustPartner", "trustDirection",
2463                 "trustType", "trustAttributes", "userAccountControl", "uSNChanged", "uSNCreated", "whenCreated",
2464                 "whenChanged", NULL};
2465         unsigned int i, el_count = 0;
2466         enum deletion_state { OBJECT_NOT_DELETED=1, OBJECT_DELETED=2, OBJECT_RECYCLED=3,
2467                                                 OBJECT_TOMBSTONE=4, OBJECT_REMOVED=5 };
2468         enum deletion_state deletion_state, next_deletion_state;
2469         bool enabled;
2470
2471         if (ldb_dn_is_special(req->op.del.dn)) {
2472                 return ldb_next_request(module, req);
2473         }
2474
2475         tmp_ctx = talloc_new(ldb);
2476         if (!tmp_ctx) {
2477                 ldb_oom(ldb);
2478                 return LDB_ERR_OPERATIONS_ERROR;
2479         }
2480
2481         schema = dsdb_get_schema(ldb, tmp_ctx);
2482         if (!schema) {
2483                 return LDB_ERR_OPERATIONS_ERROR;
2484         }
2485
2486         old_dn = ldb_dn_copy(tmp_ctx, req->op.del.dn);
2487
2488         /* we need the complete msg off disk, so we can work out which
2489            attributes need to be removed */
2490         ret = dsdb_module_search_dn(module, tmp_ctx, &res, old_dn, NULL,
2491                                     DSDB_FLAG_NEXT_MODULE |
2492                                     DSDB_SEARCH_SHOW_DELETED |
2493                                     DSDB_SEARCH_REVEAL_INTERNALS |
2494                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
2495         if (ret != LDB_SUCCESS) {
2496                 talloc_free(tmp_ctx);
2497                 return ret;
2498         }
2499         old_msg = res->msgs[0];
2500
2501
2502         ret = dsdb_recyclebin_enabled(module, &enabled);
2503         if (ret != LDB_SUCCESS) {
2504                 talloc_free(tmp_ctx);
2505                 return ret;
2506         }
2507
2508         if (ldb_msg_check_string_attribute(old_msg, "isDeleted", "TRUE")) {
2509                 if (!enabled) {
2510                         deletion_state = OBJECT_TOMBSTONE;
2511                         next_deletion_state = OBJECT_REMOVED;
2512                 } else if (ldb_msg_check_string_attribute(old_msg, "isRecycled", "TRUE")) {
2513                         deletion_state = OBJECT_RECYCLED;
2514                         next_deletion_state = OBJECT_REMOVED;
2515                 } else {
2516                         deletion_state = OBJECT_DELETED;
2517                         next_deletion_state = OBJECT_RECYCLED;
2518                 }
2519         } else {
2520                 deletion_state = OBJECT_NOT_DELETED;
2521                 if (enabled) {
2522                         next_deletion_state = OBJECT_DELETED;
2523                 } else {
2524                         next_deletion_state = OBJECT_TOMBSTONE;
2525                 }
2526         }
2527
2528         if (next_deletion_state == OBJECT_REMOVED) {
2529                 struct auth_session_info *session_info =
2530                                 (struct auth_session_info *)ldb_get_opaque(ldb, "sessionInfo");
2531                 if (security_session_user_level(session_info, NULL) != SECURITY_SYSTEM) {
2532                         ldb_asprintf_errstring(ldb, "Refusing to delete deleted object %s",
2533                                         ldb_dn_get_linearized(old_msg->dn));
2534                         return LDB_ERR_UNWILLING_TO_PERFORM;
2535                 }
2536
2537                 /* it is already deleted - really remove it this time */
2538                 talloc_free(tmp_ctx);
2539                 return ldb_next_request(module, req);
2540         }
2541
2542         rdn_name = ldb_dn_get_rdn_name(old_dn);
2543         rdn_value = ldb_dn_get_rdn_val(old_dn);
2544
2545         msg = ldb_msg_new(tmp_ctx);
2546         if (msg == NULL) {
2547                 ldb_module_oom(module);
2548                 talloc_free(tmp_ctx);
2549                 return LDB_ERR_OPERATIONS_ERROR;
2550         }
2551
2552         msg->dn = old_dn;
2553
2554         if (deletion_state == OBJECT_NOT_DELETED){
2555                 /* work out where we will be renaming this object to */
2556                 ret = dsdb_get_deleted_objects_dn(ldb, tmp_ctx, old_dn, &new_dn);
2557                 if (ret != LDB_SUCCESS) {
2558                         /* this is probably an attempted delete on a partition
2559                          * that doesn't allow delete operations, such as the
2560                          * schema partition */
2561                         ldb_asprintf_errstring(ldb, "No Deleted Objects container for DN %s",
2562                                                    ldb_dn_get_linearized(old_dn));
2563                         talloc_free(tmp_ctx);
2564                         return LDB_ERR_UNWILLING_TO_PERFORM;
2565                 }
2566
2567                 /* get the objects GUID from the search we just did */
2568                 guid = samdb_result_guid(old_msg, "objectGUID");
2569
2570                 /* Add a formatted child */
2571                 retb = ldb_dn_add_child_fmt(new_dn, "%s=%s\\0ADEL:%s",
2572                                                 rdn_name,
2573                                                 rdn_value->data,
2574                                                 GUID_string(tmp_ctx, &guid));
2575                 if (!retb) {
2576                         DEBUG(0,(__location__ ": Unable to add a formatted child to dn: %s",
2577                                         ldb_dn_get_linearized(new_dn)));
2578                         talloc_free(tmp_ctx);
2579                         return LDB_ERR_OPERATIONS_ERROR;
2580                 }
2581
2582                 ret = ldb_msg_add_string(msg, "isDeleted", "TRUE");
2583                 if (ret != LDB_SUCCESS) {
2584                         DEBUG(0,(__location__ ": Failed to add isDeleted string to the msg\n"));
2585                         ldb_module_oom(module);
2586                         talloc_free(tmp_ctx);
2587                         return ret;
2588                 }
2589                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2590         }
2591
2592         /*
2593           now we need to modify the object in the following ways:
2594
2595           - add isDeleted=TRUE
2596           - update rDN and name, with new rDN
2597           - remove linked attributes
2598           - remove objectCategory and sAMAccountType
2599           - remove attribs not on the preserved list
2600              - preserved if in above list, or is rDN
2601           - remove all linked attribs from this object
2602           - remove all links from other objects to this object
2603           - add lastKnownParent
2604           - update replPropertyMetaData?
2605
2606           see MS-ADTS "Tombstone Requirements" section 3.1.1.5.5.1.1
2607          */
2608
2609         /* we need the storage form of the parent GUID */
2610         ret = dsdb_module_search_dn(module, tmp_ctx, &parent_res,
2611                                     ldb_dn_get_parent(tmp_ctx, old_dn), NULL,
2612                                     DSDB_FLAG_NEXT_MODULE |
2613                                     DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
2614                                     DSDB_SEARCH_REVEAL_INTERNALS|
2615                                     DSDB_SEARCH_SHOW_DELETED);
2616         if (ret != LDB_SUCCESS) {
2617                 talloc_free(tmp_ctx);
2618                 return ret;
2619         }
2620
2621         if (deletion_state == OBJECT_NOT_DELETED){
2622                 ret = ldb_msg_add_steal_string(msg, "lastKnownParent",
2623                                                    ldb_dn_get_extended_linearized(tmp_ctx, parent_res->msgs[0]->dn, 1));
2624                 if (ret != LDB_SUCCESS) {
2625                         DEBUG(0,(__location__ ": Failed to add lastKnownParent string to the msg\n"));
2626                         ldb_module_oom(module);
2627                         talloc_free(tmp_ctx);
2628                         return ret;
2629                 }
2630                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2631         }
2632
2633         switch (next_deletion_state){
2634
2635         case OBJECT_DELETED:
2636
2637                 ret = ldb_msg_add_value(msg, "msDS-LastKnownRDN", rdn_value, NULL);
2638                 if (ret != LDB_SUCCESS) {
2639                         DEBUG(0,(__location__ ": Failed to add msDS-LastKnownRDN string to the msg\n"));
2640                         ldb_module_oom(module);
2641                         talloc_free(tmp_ctx);
2642                         return ret;
2643                 }
2644                 msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2645
2646                 ret = ldb_msg_add_empty(msg, "objectCategory", LDB_FLAG_MOD_DELETE, NULL);
2647                 if (ret != LDB_SUCCESS) {
2648                         talloc_free(tmp_ctx);
2649                         ldb_module_oom(module);
2650                         return ret;
2651                 }
2652
2653                 ret = ldb_msg_add_empty(msg, "sAMAccountType", LDB_FLAG_MOD_DELETE, NULL);
2654                 if (ret != LDB_SUCCESS) {
2655                         talloc_free(tmp_ctx);
2656                         ldb_module_oom(module);
2657                         return ret;
2658                 }
2659
2660                 break;
2661
2662         case OBJECT_RECYCLED:
2663         case OBJECT_TOMBSTONE:
2664
2665                 /* we also mark it as recycled, meaning this object can't be
2666                    recovered (we are stripping its attributes) */
2667                 if (dsdb_functional_level(ldb) >= DS_DOMAIN_FUNCTION_2008_R2) {
2668                         ret = ldb_msg_add_string(msg, "isRecycled", "TRUE");
2669                         if (ret != LDB_SUCCESS) {
2670                                 DEBUG(0,(__location__ ": Failed to add isRecycled string to the msg\n"));
2671                                 ldb_module_oom(module);
2672                                 talloc_free(tmp_ctx);
2673                                 return ret;
2674                         }
2675                         msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
2676                 }
2677
2678                 /* work out which of the old attributes we will be removing */
2679                 for (i=0; i<old_msg->num_elements; i++) {
2680                         const struct dsdb_attribute *sa;
2681                         el = &old_msg->elements[i];
2682                         sa = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
2683                         if (!sa) {
2684                                 talloc_free(tmp_ctx);
2685                                 return LDB_ERR_OPERATIONS_ERROR;
2686                         }
2687                         if (ldb_attr_cmp(el->name, rdn_name) == 0) {
2688                                 /* don't remove the rDN */
2689                                 continue;
2690                         }
2691                         if (sa->linkID && sa->linkID & 1) {
2692                                 ret = replmd_delete_remove_link(module, schema, old_dn, el, sa);
2693                                 if (ret != LDB_SUCCESS) {
2694                                         talloc_free(tmp_ctx);
2695                                         return LDB_ERR_OPERATIONS_ERROR;
2696                                 }
2697                                 continue;
2698                         }
2699                         if (!sa->linkID && ldb_attr_in_list(preserved_attrs, el->name)) {
2700                                 continue;
2701                         }
2702                         ret = ldb_msg_add_empty(msg, el->name, LDB_FLAG_MOD_DELETE, &el);
2703                         if (ret != LDB_SUCCESS) {
2704                                 talloc_free(tmp_ctx);
2705                                 ldb_module_oom(module);
2706                                 return ret;
2707                         }
2708                 }
2709                 break;
2710
2711         default:
2712                 break;
2713         }
2714
2715         if (deletion_state == OBJECT_NOT_DELETED) {
2716                 /* work out what the new rdn value is, for updating the
2717                    rDN and name fields */
2718                 new_rdn_value = ldb_dn_get_rdn_val(new_dn);
2719
2720                 ret = ldb_msg_add_value(msg, strlower_talloc(tmp_ctx, rdn_name), new_rdn_value, &el);
2721                 if (ret != LDB_SUCCESS) {
2722                         talloc_free(tmp_ctx);
2723                         return ret;
2724                 }
2725                 el->flags = LDB_FLAG_MOD_REPLACE;
2726
2727                 el = ldb_msg_find_element(old_msg, "name");
2728                 if (el) {
2729                         ret = ldb_msg_add_value(msg, "name", new_rdn_value, &el);
2730                         if (ret != LDB_SUCCESS) {
2731                                 talloc_free(tmp_ctx);
2732                                 return ret;
2733                         }
2734                         el->flags = LDB_FLAG_MOD_REPLACE;
2735                 }
2736         }
2737
2738         ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE);
2739         if (ret != LDB_SUCCESS) {
2740                 ldb_asprintf_errstring(ldb, "replmd_delete: Failed to modify object %s in delete - %s",
2741                                        ldb_dn_get_linearized(old_dn), ldb_errstring(ldb));
2742                 talloc_free(tmp_ctx);
2743                 return ret;
2744         }
2745
2746         if (deletion_state == OBJECT_NOT_DELETED) {
2747                 /* now rename onto the new DN */
2748                 ret = dsdb_module_rename(module, old_dn, new_dn, DSDB_FLAG_NEXT_MODULE);
2749                 if (ret != LDB_SUCCESS){
2750                         DEBUG(0,(__location__ ": Failed to rename object from '%s' to '%s' - %s\n",
2751                                  ldb_dn_get_linearized(old_dn),
2752                                  ldb_dn_get_linearized(new_dn),
2753                                  ldb_errstring(ldb)));
2754                         talloc_free(tmp_ctx);
2755                         return ret;
2756                 }
2757         }
2758
2759         talloc_free(tmp_ctx);
2760
2761         return ldb_module_done(req, NULL, NULL, LDB_SUCCESS);
2762 }
2763
2764
2765
2766 static int replmd_replicated_request_error(struct replmd_replicated_request *ar, int ret)
2767 {
2768         return ret;
2769 }
2770
2771 static int replmd_replicated_request_werror(struct replmd_replicated_request *ar, WERROR status)
2772 {
2773         int ret = LDB_ERR_OTHER;
2774         /* TODO: do some error mapping */
2775         return ret;
2776 }
2777
2778 static int replmd_replicated_apply_add(struct replmd_replicated_request *ar)
2779 {
2780         struct ldb_context *ldb;
2781         struct ldb_request *change_req;
2782         enum ndr_err_code ndr_err;
2783         struct ldb_message *msg;
2784         struct replPropertyMetaDataBlob *md;
2785         struct ldb_val md_value;
2786         unsigned int i;
2787         int ret;
2788
2789         /*
2790          * TODO: check if the parent object exist
2791          */
2792
2793         /*
2794          * TODO: handle the conflict case where an object with the
2795          *       same name exist
2796          */
2797
2798         ldb = ldb_module_get_ctx(ar->module);
2799         msg = ar->objs->objects[ar->index_current].msg;
2800         md = ar->objs->objects[ar->index_current].meta_data;
2801
2802         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
2803         if (ret != LDB_SUCCESS) {
2804                 return replmd_replicated_request_error(ar, ret);
2805         }
2806
2807         ret = ldb_msg_add_value(msg, "objectGUID", &ar->objs->objects[ar->index_current].guid_value, NULL);
2808         if (ret != LDB_SUCCESS) {
2809                 return replmd_replicated_request_error(ar, ret);
2810         }
2811
2812         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
2813         if (ret != LDB_SUCCESS) {
2814                 return replmd_replicated_request_error(ar, ret);
2815         }
2816
2817         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ar->seq_num);
2818         if (ret != LDB_SUCCESS) {
2819                 return replmd_replicated_request_error(ar, ret);
2820         }
2821
2822         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
2823         if (ret != LDB_SUCCESS) {
2824                 return replmd_replicated_request_error(ar, ret);
2825         }
2826
2827         /* remove any message elements that have zero values */
2828         for (i=0; i<msg->num_elements; i++) {
2829                 struct ldb_message_element *el = &msg->elements[i];
2830
2831                 if (el->num_values == 0) {
2832                         DEBUG(4,(__location__ ": Removing attribute %s with num_values==0\n",
2833                                  el->name));
2834                         memmove(el, el+1, sizeof(*el)*(msg->num_elements - (i+1)));
2835                         msg->num_elements--;
2836                         i--;
2837                         continue;
2838                 }
2839         }
2840
2841         /*
2842          * the meta data array is already sorted by the caller
2843          */
2844         for (i=0; i < md->ctr.ctr1.count; i++) {
2845                 md->ctr.ctr1.array[i].local_usn = ar->seq_num;
2846         }
2847         ndr_err = ndr_push_struct_blob(&md_value, msg, md,
2848                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
2849         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2850                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2851                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2852         }
2853         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &md_value, NULL);
2854         if (ret != LDB_SUCCESS) {
2855                 return replmd_replicated_request_error(ar, ret);
2856         }
2857
2858         replmd_ldb_message_sort(msg, ar->schema);
2859
2860         if (DEBUGLVL(4)) {
2861                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_ADD, msg);
2862                 DEBUG(4, ("DRS replication add message:\n%s\n", s));
2863                 talloc_free(s);
2864         }
2865
2866         ret = ldb_build_add_req(&change_req,
2867                                 ldb,
2868                                 ar,
2869                                 msg,
2870                                 ar->controls,
2871                                 ar,
2872                                 replmd_op_callback,
2873                                 ar->req);
2874         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
2875
2876         return ldb_next_request(ar->module, change_req);
2877 }
2878
2879 /*
2880    return true if an update is newer than an existing entry
2881    see section 5.11 of MS-ADTS
2882 */
2883 static bool replmd_update_is_newer(const struct GUID *current_invocation_id,
2884                                    const struct GUID *update_invocation_id,
2885                                    uint32_t current_version,
2886                                    uint32_t update_version,
2887                                    NTTIME current_change_time,
2888                                    NTTIME update_change_time)
2889 {
2890         if (update_version != current_version) {
2891                 return update_version > current_version;
2892         }
2893         if (update_change_time > current_change_time) {
2894                 return true;
2895         }
2896         if (update_change_time == current_change_time) {
2897                 return GUID_compare(update_invocation_id, current_invocation_id) > 0;
2898         }
2899         return false;
2900 }
2901
2902 static bool replmd_replPropertyMetaData1_is_newer(struct replPropertyMetaData1 *cur_m,
2903                                                   struct replPropertyMetaData1 *new_m)
2904 {
2905         return replmd_update_is_newer(&cur_m->originating_invocation_id,
2906                                       &new_m->originating_invocation_id,
2907                                       cur_m->version,
2908                                       new_m->version,
2909                                       cur_m->originating_change_time,
2910                                       new_m->originating_change_time);
2911 }
2912
2913 static struct replPropertyMetaData1 *
2914 replmd_replPropertyMetaData1_find_attid(struct replPropertyMetaDataBlob *md_blob,
2915                                         enum drsuapi_DsAttributeId attid)
2916 {
2917         uint32_t i;
2918         struct replPropertyMetaDataCtr1 *rpmd_ctr = &md_blob->ctr.ctr1;
2919
2920         for (i = 0; i < rpmd_ctr->count; i++) {
2921                 if (rpmd_ctr->array[i].attid == attid) {
2922                         return &rpmd_ctr->array[i];
2923                 }
2924         }
2925         return NULL;
2926 }
2927
2928 static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
2929 {
2930         struct ldb_context *ldb;
2931         struct ldb_request *change_req;
2932         enum ndr_err_code ndr_err;
2933         struct ldb_message *msg;
2934         struct replPropertyMetaDataBlob *rmd;
2935         struct replPropertyMetaDataBlob omd;
2936         const struct ldb_val *omd_value;
2937         struct replPropertyMetaDataBlob nmd;
2938         struct ldb_val nmd_value;
2939         struct replPropertyMetaData1 *md_remote;
2940         struct replPropertyMetaData1 *md_local;
2941         unsigned int i;
2942         uint32_t j,ni=0;
2943         unsigned int removed_attrs = 0;
2944         int ret;
2945
2946         ldb = ldb_module_get_ctx(ar->module);
2947         msg = ar->objs->objects[ar->index_current].msg;
2948         rmd = ar->objs->objects[ar->index_current].meta_data;
2949         ZERO_STRUCT(omd);
2950         omd.version = 1;
2951
2952         /* find existing meta data */
2953         omd_value = ldb_msg_find_ldb_val(ar->search_msg, "replPropertyMetaData");
2954         if (omd_value) {
2955                 ndr_err = ndr_pull_struct_blob(omd_value, ar, &omd,
2956                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
2957                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
2958                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
2959                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
2960                 }
2961
2962                 if (omd.version != 1) {
2963                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
2964                 }
2965         }
2966
2967         /* check if remote 'name' has change,
2968          * which indicates a rename operation */
2969         md_remote = replmd_replPropertyMetaData1_find_attid(rmd, DRSUAPI_ATTRIBUTE_name);
2970         if (md_remote) {
2971                 md_local = replmd_replPropertyMetaData1_find_attid(&omd, DRSUAPI_ATTRIBUTE_name);
2972                 SMB_ASSERT(md_local);
2973                 if (replmd_replPropertyMetaData1_is_newer(md_local, md_remote)) {
2974                         SMB_ASSERT(ldb_dn_compare(msg->dn, ar->search_msg->dn) != 0);
2975                         /* TODO: Find appropriate local name (dn) for the object
2976                          *       and modify msg->dn appropriately */
2977
2978                         DEBUG(4,("replmd_replicated_request rename %s => %s\n",
2979                                   ldb_dn_get_linearized(ar->search_msg->dn),
2980                                   ldb_dn_get_linearized(msg->dn)));
2981                         /* pass rename to the next module
2982                          * so it doesn't appear as an originating update */
2983                         ret = dsdb_module_rename(ar->module,
2984                                                  ar->search_msg->dn, msg->dn,
2985                                                  DSDB_FLAG_NEXT_MODULE);
2986                         if (ret != LDB_SUCCESS) {
2987                                 ldb_debug(ldb, LDB_DEBUG_FATAL,
2988                                           "replmd_replicated_request rename %s => %s failed - %s\n",
2989                                           ldb_dn_get_linearized(ar->search_msg->dn),
2990                                           ldb_dn_get_linearized(msg->dn),
2991                                           ldb_errstring(ldb));
2992                                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_DB_ERROR);
2993                         }
2994                 }
2995         }
2996
2997         ZERO_STRUCT(nmd);
2998         nmd.version = 1;
2999         nmd.ctr.ctr1.count = omd.ctr.ctr1.count + rmd->ctr.ctr1.count;
3000         nmd.ctr.ctr1.array = talloc_array(ar,
3001                                           struct replPropertyMetaData1,
3002                                           nmd.ctr.ctr1.count);
3003         if (!nmd.ctr.ctr1.array) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3004
3005         /* first copy the old meta data */
3006         for (i=0; i < omd.ctr.ctr1.count; i++) {
3007                 nmd.ctr.ctr1.array[ni]  = omd.ctr.ctr1.array[i];
3008                 ni++;
3009         }
3010
3011         /* now merge in the new meta data */
3012         for (i=0; i < rmd->ctr.ctr1.count; i++) {
3013                 bool found = false;
3014
3015                 for (j=0; j < ni; j++) {
3016                         bool cmp;
3017
3018                         if (rmd->ctr.ctr1.array[i].attid != nmd.ctr.ctr1.array[j].attid) {
3019                                 continue;
3020                         }
3021
3022                         cmp = replmd_replPropertyMetaData1_is_newer(&nmd.ctr.ctr1.array[j],
3023                                                                     &rmd->ctr.ctr1.array[i]);
3024                         if (cmp) {
3025                                 /* replace the entry */
3026                                 nmd.ctr.ctr1.array[j] = rmd->ctr.ctr1.array[i];
3027                                 found = true;
3028                                 break;
3029                         }
3030
3031                         if (rmd->ctr.ctr1.array[i].attid != DRSUAPI_ATTRIBUTE_instanceType) {
3032                                 DEBUG(3,("Discarding older DRS attribute update to %s on %s from %s\n",
3033                                          msg->elements[i-removed_attrs].name,
3034                                          ldb_dn_get_linearized(msg->dn),
3035                                          GUID_string(ar, &rmd->ctr.ctr1.array[i].originating_invocation_id)));
3036                         }
3037
3038                         /* we don't want to apply this change so remove the attribute */
3039                         ldb_msg_remove_element(msg, &msg->elements[i-removed_attrs]);
3040                         removed_attrs++;
3041
3042                         found = true;
3043                         break;
3044                 }
3045
3046                 if (found) continue;
3047
3048                 nmd.ctr.ctr1.array[ni] = rmd->ctr.ctr1.array[i];
3049                 ni++;
3050         }
3051
3052         /*
3053          * finally correct the size of the meta_data array
3054          */
3055         nmd.ctr.ctr1.count = ni;
3056
3057         /*
3058          * the rdn attribute (the alias for the name attribute),
3059          * 'cn' for most objects is the last entry in the meta data array
3060          * we have stored
3061          *
3062          * sort the new meta data array
3063          */
3064         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ar->schema, msg->dn);
3065         if (ret != LDB_SUCCESS) {
3066                 return ret;
3067         }
3068
3069         /*
3070          * check if some replicated attributes left, otherwise skip the ldb_modify() call
3071          */
3072         if (msg->num_elements == 0) {
3073                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: skip replace\n",
3074                           ar->index_current);
3075
3076                 ar->index_current++;
3077                 return replmd_replicated_apply_next(ar);
3078         }
3079
3080         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: replace %u attributes\n",
3081                   ar->index_current, msg->num_elements);
3082
3083         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
3084         if (ret != LDB_SUCCESS) {
3085                 return replmd_replicated_request_error(ar, ret);
3086         }
3087
3088         for (i=0; i<ni; i++) {
3089                 nmd.ctr.ctr1.array[i].local_usn = ar->seq_num;
3090         }
3091
3092         /* create the meta data value */
3093         ndr_err = ndr_push_struct_blob(&nmd_value, msg, &nmd,
3094                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
3095         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3096                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3097                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3098         }
3099
3100         /*
3101          * when we know that we'll modify the record, add the whenChanged, uSNChanged
3102          * and replPopertyMetaData attributes
3103          */
3104         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
3105         if (ret != LDB_SUCCESS) {
3106                 return replmd_replicated_request_error(ar, ret);
3107         }
3108         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
3109         if (ret != LDB_SUCCESS) {
3110                 return replmd_replicated_request_error(ar, ret);
3111         }
3112         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
3113         if (ret != LDB_SUCCESS) {
3114                 return replmd_replicated_request_error(ar, ret);
3115         }
3116
3117         replmd_ldb_message_sort(msg, ar->schema);
3118
3119         /* we want to replace the old values */
3120         for (i=0; i < msg->num_elements; i++) {
3121                 msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
3122         }
3123
3124         if (DEBUGLVL(4)) {
3125                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
3126                 DEBUG(4, ("DRS replication modify message:\n%s\n", s));
3127                 talloc_free(s);
3128         }
3129
3130         ret = ldb_build_mod_req(&change_req,
3131                                 ldb,
3132                                 ar,
3133                                 msg,
3134                                 ar->controls,
3135                                 ar,
3136                                 replmd_op_callback,
3137                                 ar->req);
3138         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3139
3140         return ldb_next_request(ar->module, change_req);
3141 }
3142
3143 static int replmd_replicated_apply_search_callback(struct ldb_request *req,
3144                                                    struct ldb_reply *ares)
3145 {
3146         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3147                                                struct replmd_replicated_request);
3148         int ret;
3149
3150         if (!ares) {
3151                 return ldb_module_done(ar->req, NULL, NULL,
3152                                         LDB_ERR_OPERATIONS_ERROR);
3153         }
3154         if (ares->error != LDB_SUCCESS &&
3155             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3156                 return ldb_module_done(ar->req, ares->controls,
3157                                         ares->response, ares->error);
3158         }
3159
3160         switch (ares->type) {
3161         case LDB_REPLY_ENTRY:
3162                 ar->search_msg = talloc_steal(ar, ares->message);
3163                 break;
3164
3165         case LDB_REPLY_REFERRAL:
3166                 /* we ignore referrals */
3167                 break;
3168
3169         case LDB_REPLY_DONE:
3170                 if (ar->search_msg != NULL) {
3171                         ret = replmd_replicated_apply_merge(ar);
3172                 } else {
3173                         ret = replmd_replicated_apply_add(ar);
3174                 }
3175                 if (ret != LDB_SUCCESS) {
3176                         return ldb_module_done(ar->req, NULL, NULL, ret);
3177                 }
3178         }
3179
3180         talloc_free(ares);
3181         return LDB_SUCCESS;
3182 }
3183
3184 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar);
3185
3186 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar)
3187 {
3188         struct ldb_context *ldb;
3189         int ret;
3190         char *tmp_str;
3191         char *filter;
3192         struct ldb_request *search_req;
3193         struct ldb_search_options_control *options;
3194
3195         if (ar->index_current >= ar->objs->num_objects) {
3196                 /* done with it, go to next stage */
3197                 return replmd_replicated_uptodate_vector(ar);
3198         }
3199
3200         ldb = ldb_module_get_ctx(ar->module);
3201         ar->search_msg = NULL;
3202
3203         tmp_str = ldb_binary_encode(ar, ar->objs->objects[ar->index_current].guid_value);
3204         if (!tmp_str) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3205
3206         filter = talloc_asprintf(ar, "(objectGUID=%s)", tmp_str);
3207         if (!filter) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3208         talloc_free(tmp_str);
3209
3210         ret = ldb_build_search_req(&search_req,
3211                                    ldb,
3212                                    ar,
3213                                    NULL,
3214                                    LDB_SCOPE_SUBTREE,
3215                                    filter,
3216                                    NULL,
3217                                    NULL,
3218                                    ar,
3219                                    replmd_replicated_apply_search_callback,
3220                                    ar->req);
3221
3222         ret = ldb_request_add_control(search_req, LDB_CONTROL_SHOW_DELETED_OID, true, NULL);
3223         if (ret != LDB_SUCCESS) {
3224                 return ret;
3225         }
3226
3227         /* we need to cope with cross-partition links, so search for
3228            the GUID over all partitions */
3229         options = talloc(search_req, struct ldb_search_options_control);
3230         if (options == NULL) {
3231                 DEBUG(0, (__location__ ": out of memory\n"));
3232                 return LDB_ERR_OPERATIONS_ERROR;
3233         }
3234         options->search_options = LDB_SEARCH_OPTION_PHANTOM_ROOT;
3235
3236         ret = ldb_request_add_control(search_req,
3237                                       LDB_CONTROL_SEARCH_OPTIONS_OID,
3238                                       true, options);
3239         if (ret != LDB_SUCCESS) {
3240                 return ret;
3241         }
3242
3243         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3244
3245         return ldb_next_request(ar->module, search_req);
3246 }
3247
3248 static int replmd_replicated_uptodate_modify_callback(struct ldb_request *req,
3249                                                       struct ldb_reply *ares)
3250 {
3251         struct ldb_context *ldb;
3252         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3253                                                struct replmd_replicated_request);
3254         ldb = ldb_module_get_ctx(ar->module);
3255
3256         if (!ares) {
3257                 return ldb_module_done(ar->req, NULL, NULL,
3258                                         LDB_ERR_OPERATIONS_ERROR);
3259         }
3260         if (ares->error != LDB_SUCCESS) {
3261                 return ldb_module_done(ar->req, ares->controls,
3262                                         ares->response, ares->error);
3263         }
3264
3265         if (ares->type != LDB_REPLY_DONE) {
3266                 ldb_set_errstring(ldb, "Invalid reply type\n!");
3267                 return ldb_module_done(ar->req, NULL, NULL,
3268                                         LDB_ERR_OPERATIONS_ERROR);
3269         }
3270
3271         talloc_free(ares);
3272
3273         return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
3274 }
3275
3276 static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *ar)
3277 {
3278         struct ldb_context *ldb;
3279         struct ldb_request *change_req;
3280         enum ndr_err_code ndr_err;
3281         struct ldb_message *msg;
3282         struct replUpToDateVectorBlob ouv;
3283         const struct ldb_val *ouv_value;
3284         const struct drsuapi_DsReplicaCursor2CtrEx *ruv;
3285         struct replUpToDateVectorBlob nuv;
3286         struct ldb_val nuv_value;
3287         struct ldb_message_element *nuv_el = NULL;
3288         const struct GUID *our_invocation_id;
3289         struct ldb_message_element *orf_el = NULL;
3290         struct repsFromToBlob nrf;
3291         struct ldb_val *nrf_value = NULL;
3292         struct ldb_message_element *nrf_el = NULL;
3293         unsigned int i;
3294         uint32_t j,ni=0;
3295         bool found = false;
3296         time_t t = time(NULL);
3297         NTTIME now;
3298         int ret;
3299
3300         ldb = ldb_module_get_ctx(ar->module);
3301         ruv = ar->objs->uptodateness_vector;
3302         ZERO_STRUCT(ouv);
3303         ouv.version = 2;
3304         ZERO_STRUCT(nuv);
3305         nuv.version = 2;
3306
3307         unix_to_nt_time(&now, t);
3308
3309         /*
3310          * first create the new replUpToDateVector
3311          */
3312         ouv_value = ldb_msg_find_ldb_val(ar->search_msg, "replUpToDateVector");
3313         if (ouv_value) {
3314                 ndr_err = ndr_pull_struct_blob(ouv_value, ar, &ouv,
3315                                                (ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob);
3316                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3317                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3318                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3319                 }
3320
3321                 if (ouv.version != 2) {
3322                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3323                 }
3324         }
3325
3326         /*
3327          * the new uptodateness vector will at least
3328          * contain 1 entry, one for the source_dsa
3329          *
3330          * plus optional values from our old vector and the one from the source_dsa
3331          */
3332         nuv.ctr.ctr2.count = 1 + ouv.ctr.ctr2.count;
3333         if (ruv) nuv.ctr.ctr2.count += ruv->count;
3334         nuv.ctr.ctr2.cursors = talloc_array(ar,
3335                                             struct drsuapi_DsReplicaCursor2,
3336                                             nuv.ctr.ctr2.count);
3337         if (!nuv.ctr.ctr2.cursors) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3338
3339         /* first copy the old vector */
3340         for (i=0; i < ouv.ctr.ctr2.count; i++) {
3341                 nuv.ctr.ctr2.cursors[ni] = ouv.ctr.ctr2.cursors[i];
3342                 ni++;
3343         }
3344
3345         /* get our invocation_id if we have one already attached to the ldb */
3346         our_invocation_id = samdb_ntds_invocation_id(ldb);
3347
3348         /* merge in the source_dsa vector is available */
3349         for (i=0; (ruv && i < ruv->count); i++) {
3350                 found = false;
3351
3352                 if (our_invocation_id &&
3353                     GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
3354                                our_invocation_id)) {
3355                         continue;
3356                 }
3357
3358                 for (j=0; j < ni; j++) {
3359                         if (!GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
3360                                         &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
3361                                 continue;
3362                         }
3363
3364                         found = true;
3365
3366                         /*
3367                          * we update only the highest_usn and not the latest_sync_success time,
3368                          * because the last success stands for direct replication
3369                          */
3370                         if (ruv->cursors[i].highest_usn > nuv.ctr.ctr2.cursors[j].highest_usn) {
3371                                 nuv.ctr.ctr2.cursors[j].highest_usn = ruv->cursors[i].highest_usn;
3372                         }
3373                         break;
3374                 }
3375
3376                 if (found) continue;
3377
3378                 /* if it's not there yet, add it */
3379                 nuv.ctr.ctr2.cursors[ni] = ruv->cursors[i];
3380                 ni++;
3381         }
3382
3383         /*
3384          * merge in the current highwatermark for the source_dsa
3385          */
3386         found = false;
3387         for (j=0; j < ni; j++) {
3388                 if (!GUID_equal(&ar->objs->source_dsa->source_dsa_invocation_id,
3389                                 &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
3390                         continue;
3391                 }
3392
3393                 found = true;
3394
3395                 /*
3396                  * here we update the highest_usn and last_sync_success time
3397                  * because we're directly replicating from the source_dsa
3398                  *
3399                  * and use the tmp_highest_usn because this is what we have just applied
3400                  * to our ldb
3401                  */
3402                 nuv.ctr.ctr2.cursors[j].highest_usn             = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
3403                 nuv.ctr.ctr2.cursors[j].last_sync_success       = now;
3404                 break;
3405         }
3406         if (!found) {
3407                 /*
3408                  * here we update the highest_usn and last_sync_success time
3409                  * because we're directly replicating from the source_dsa
3410                  *
3411                  * and use the tmp_highest_usn because this is what we have just applied
3412                  * to our ldb
3413                  */
3414                 nuv.ctr.ctr2.cursors[ni].source_dsa_invocation_id= ar->objs->source_dsa->source_dsa_invocation_id;
3415                 nuv.ctr.ctr2.cursors[ni].highest_usn            = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
3416                 nuv.ctr.ctr2.cursors[ni].last_sync_success      = now;
3417                 ni++;
3418         }
3419
3420         /*
3421          * finally correct the size of the cursors array
3422          */
3423         nuv.ctr.ctr2.count = ni;
3424
3425         /*
3426          * sort the cursors
3427          */
3428         TYPESAFE_QSORT(nuv.ctr.ctr2.cursors, nuv.ctr.ctr2.count, drsuapi_DsReplicaCursor2_compare);
3429
3430         /*
3431          * create the change ldb_message
3432          */
3433         msg = ldb_msg_new(ar);
3434         if (!msg) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3435         msg->dn = ar->search_msg->dn;
3436
3437         ndr_err = ndr_push_struct_blob(&nuv_value, msg, &nuv,
3438                                        (ndr_push_flags_fn_t)ndr_push_replUpToDateVectorBlob);
3439         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3440                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3441                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3442         }
3443         ret = ldb_msg_add_value(msg, "replUpToDateVector", &nuv_value, &nuv_el);
3444         if (ret != LDB_SUCCESS) {
3445                 return replmd_replicated_request_error(ar, ret);
3446         }
3447         nuv_el->flags = LDB_FLAG_MOD_REPLACE;
3448
3449         /*
3450          * now create the new repsFrom value from the given repsFromTo1 structure
3451          */
3452         ZERO_STRUCT(nrf);
3453         nrf.version                                     = 1;
3454         nrf.ctr.ctr1                                    = *ar->objs->source_dsa;
3455         /* and fix some values... */
3456         nrf.ctr.ctr1.consecutive_sync_failures          = 0;
3457         nrf.ctr.ctr1.last_success                       = now;
3458         nrf.ctr.ctr1.last_attempt                       = now;
3459         nrf.ctr.ctr1.result_last_attempt                = WERR_OK;
3460         nrf.ctr.ctr1.highwatermark.highest_usn          = nrf.ctr.ctr1.highwatermark.tmp_highest_usn;
3461
3462         /*
3463          * first see if we already have a repsFrom value for the current source dsa
3464          * if so we'll later replace this value
3465          */
3466         orf_el = ldb_msg_find_element(ar->search_msg, "repsFrom");
3467         if (orf_el) {
3468                 for (i=0; i < orf_el->num_values; i++) {
3469                         struct repsFromToBlob *trf;
3470
3471                         trf = talloc(ar, struct repsFromToBlob);
3472                         if (!trf) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3473
3474                         ndr_err = ndr_pull_struct_blob(&orf_el->values[i], trf, trf,
3475                                                        (ndr_pull_flags_fn_t)ndr_pull_repsFromToBlob);
3476                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3477                                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3478                                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3479                         }
3480
3481                         if (trf->version != 1) {
3482                                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3483                         }
3484
3485                         /*
3486                          * we compare the source dsa objectGUID not the invocation_id
3487                          * because we want only one repsFrom value per source dsa
3488                          * and when the invocation_id of the source dsa has changed we don't need
3489                          * the old repsFrom with the old invocation_id
3490                          */
3491                         if (!GUID_equal(&trf->ctr.ctr1.source_dsa_obj_guid,
3492                                         &ar->objs->source_dsa->source_dsa_obj_guid)) {
3493                                 talloc_free(trf);
3494                                 continue;
3495                         }
3496
3497                         talloc_free(trf);
3498                         nrf_value = &orf_el->values[i];
3499                         break;
3500                 }
3501
3502                 /*
3503                  * copy over all old values to the new ldb_message
3504                  */
3505                 ret = ldb_msg_add_empty(msg, "repsFrom", 0, &nrf_el);
3506                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3507                 *nrf_el = *orf_el;
3508         }
3509
3510         /*
3511          * if we haven't found an old repsFrom value for the current source dsa
3512          * we'll add a new value
3513          */
3514         if (!nrf_value) {
3515                 struct ldb_val zero_value;
3516                 ZERO_STRUCT(zero_value);
3517                 ret = ldb_msg_add_value(msg, "repsFrom", &zero_value, &nrf_el);
3518                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3519
3520                 nrf_value = &nrf_el->values[nrf_el->num_values - 1];
3521         }
3522
3523         /* we now fill the value which is already attached to ldb_message */
3524         ndr_err = ndr_push_struct_blob(nrf_value, msg,
3525                                        &nrf,
3526                                        (ndr_push_flags_fn_t)ndr_push_repsFromToBlob);
3527         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
3528                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
3529                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
3530         }
3531
3532         /*
3533          * the ldb_message_element for the attribute, has all the old values and the new one
3534          * so we'll replace the whole attribute with all values
3535          */
3536         nrf_el->flags = LDB_FLAG_MOD_REPLACE;
3537
3538         if (DEBUGLVL(4)) {
3539                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
3540                 DEBUG(4, ("DRS replication uptodate modify message:\n%s\n", s));
3541                 talloc_free(s);
3542         }
3543
3544         /* prepare the ldb_modify() request */
3545         ret = ldb_build_mod_req(&change_req,
3546                                 ldb,
3547                                 ar,
3548                                 msg,
3549                                 ar->controls,
3550                                 ar,
3551                                 replmd_replicated_uptodate_modify_callback,
3552                                 ar->req);
3553         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3554
3555         return ldb_next_request(ar->module, change_req);
3556 }
3557
3558 static int replmd_replicated_uptodate_search_callback(struct ldb_request *req,
3559                                                       struct ldb_reply *ares)
3560 {
3561         struct replmd_replicated_request *ar = talloc_get_type(req->context,
3562                                                struct replmd_replicated_request);
3563         int ret;
3564
3565         if (!ares) {
3566                 return ldb_module_done(ar->req, NULL, NULL,
3567                                         LDB_ERR_OPERATIONS_ERROR);
3568         }
3569         if (ares->error != LDB_SUCCESS &&
3570             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
3571                 return ldb_module_done(ar->req, ares->controls,
3572                                         ares->response, ares->error);
3573         }
3574
3575         switch (ares->type) {
3576         case LDB_REPLY_ENTRY:
3577                 ar->search_msg = talloc_steal(ar, ares->message);
3578                 break;
3579
3580         case LDB_REPLY_REFERRAL:
3581                 /* we ignore referrals */
3582                 break;
3583
3584         case LDB_REPLY_DONE:
3585                 if (ar->search_msg == NULL) {
3586                         ret = replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
3587                 } else {
3588                         ret = replmd_replicated_uptodate_modify(ar);
3589                 }
3590                 if (ret != LDB_SUCCESS) {
3591                         return ldb_module_done(ar->req, NULL, NULL, ret);
3592                 }
3593         }
3594
3595         talloc_free(ares);
3596         return LDB_SUCCESS;
3597 }
3598
3599
3600 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar)
3601 {
3602         struct ldb_context *ldb;
3603         int ret;
3604         static const char *attrs[] = {
3605                 "replUpToDateVector",
3606                 "repsFrom",
3607                 NULL
3608         };
3609         struct ldb_request *search_req;
3610
3611         ldb = ldb_module_get_ctx(ar->module);
3612         ar->search_msg = NULL;
3613
3614         ret = ldb_build_search_req(&search_req,
3615                                    ldb,
3616                                    ar,
3617                                    ar->objs->partition_dn,
3618                                    LDB_SCOPE_BASE,
3619                                    "(objectClass=*)",
3620                                    attrs,
3621                                    NULL,
3622                                    ar,
3623                                    replmd_replicated_uptodate_search_callback,
3624                                    ar->req);
3625         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
3626
3627         return ldb_next_request(ar->module, search_req);
3628 }
3629
3630
3631
3632 static int replmd_extended_replicated_objects(struct ldb_module *module, struct ldb_request *req)
3633 {
3634         struct ldb_context *ldb;
3635         struct dsdb_extended_replicated_objects *objs;
3636         struct replmd_replicated_request *ar;
3637         struct ldb_control **ctrls;
3638         int ret;
3639         uint32_t i;
3640         struct replmd_private *replmd_private =
3641                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
3642
3643         ldb = ldb_module_get_ctx(module);
3644
3645         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_extended_replicated_objects\n");
3646
3647         objs = talloc_get_type(req->op.extended.data, struct dsdb_extended_replicated_objects);
3648         if (!objs) {
3649                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: invalid extended data\n");
3650                 return LDB_ERR_PROTOCOL_ERROR;
3651         }
3652
3653         if (objs->version != DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION) {
3654                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: extended data invalid version [%u != %u]\n",
3655                           objs->version, DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION);
3656                 return LDB_ERR_PROTOCOL_ERROR;
3657         }
3658
3659         ar = replmd_ctx_init(module, req);
3660         if (!ar)
3661                 return LDB_ERR_OPERATIONS_ERROR;
3662
3663         /* Set the flags to have the replmd_op_callback run over the full set of objects */
3664         ar->apply_mode = true;
3665         ar->objs = objs;
3666         ar->schema = dsdb_get_schema(ldb, ar);
3667         if (!ar->schema) {
3668                 ldb_debug_set(ldb, LDB_DEBUG_FATAL, "replmd_ctx_init: no loaded schema found\n");
3669                 talloc_free(ar);
3670                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
3671                 return LDB_ERR_CONSTRAINT_VIOLATION;
3672         }
3673
3674         ctrls = req->controls;
3675
3676         if (req->controls) {
3677                 req->controls = talloc_memdup(ar, req->controls,
3678                                               talloc_get_size(req->controls));
3679                 if (!req->controls) return replmd_replicated_request_werror(ar, WERR_NOMEM);
3680         }
3681
3682         /* This allows layers further down to know if a change came in over replication */
3683         ret = ldb_request_add_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID, false, NULL);
3684         if (ret != LDB_SUCCESS) {
3685                 return ret;
3686         }
3687
3688         /* If this change contained linked attributes in the body
3689          * (rather than in the links section) we need to update
3690          * backlinks in linked_attributes */
3691         ret = ldb_request_add_control(req, DSDB_CONTROL_APPLY_LINKS, false, NULL);
3692         if (ret != LDB_SUCCESS) {
3693                 return ret;
3694         }
3695
3696         ar->controls = req->controls;
3697         req->controls = ctrls;
3698
3699         DEBUG(4,("linked_attributes_count=%u\n", objs->linked_attributes_count));
3700
3701         /* save away the linked attributes for the end of the
3702            transaction */
3703         for (i=0; i<ar->objs->linked_attributes_count; i++) {
3704                 struct la_entry *la_entry;
3705
3706                 if (replmd_private->la_ctx == NULL) {
3707                         replmd_private->la_ctx = talloc_new(replmd_private);
3708                 }
3709                 la_entry = talloc(replmd_private->la_ctx, struct la_entry);
3710                 if (la_entry == NULL) {
3711                         ldb_oom(ldb);
3712                         return LDB_ERR_OPERATIONS_ERROR;
3713                 }
3714                 la_entry->la = talloc(la_entry, struct drsuapi_DsReplicaLinkedAttribute);
3715                 if (la_entry->la == NULL) {
3716                         talloc_free(la_entry);
3717                         ldb_oom(ldb);
3718                         return LDB_ERR_OPERATIONS_ERROR;
3719                 }
3720                 *la_entry->la = ar->objs->linked_attributes[i];
3721
3722                 /* we need to steal the non-scalars so they stay
3723                    around until the end of the transaction */
3724                 talloc_steal(la_entry->la, la_entry->la->identifier);
3725                 talloc_steal(la_entry->la, la_entry->la->value.blob);
3726
3727                 DLIST_ADD(replmd_private->la_list, la_entry);
3728         }
3729
3730         return replmd_replicated_apply_next(ar);
3731 }
3732
3733 /*
3734   process one linked attribute structure
3735  */
3736 static int replmd_process_linked_attribute(struct ldb_module *module,
3737                                            struct la_entry *la_entry)
3738 {
3739         struct drsuapi_DsReplicaLinkedAttribute *la = la_entry->la;
3740         struct ldb_context *ldb = ldb_module_get_ctx(module);
3741         struct ldb_message *msg;
3742         TALLOC_CTX *tmp_ctx = talloc_new(la_entry);
3743         const struct dsdb_schema *schema = dsdb_get_schema(ldb, tmp_ctx);
3744         int ret;
3745         const struct dsdb_attribute *attr;
3746         struct dsdb_dn *dsdb_dn;
3747         uint64_t seq_num = 0;
3748         struct ldb_message_element *old_el;
3749         WERROR status;
3750         time_t t = time(NULL);
3751         struct ldb_result *res;
3752         const char *attrs[2];
3753         struct parsed_dn *pdn_list, *pdn;
3754         struct GUID guid = GUID_zero();
3755         NTSTATUS ntstatus;
3756         bool active = (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?true:false;
3757         const struct GUID *our_invocation_id;
3758
3759 /*
3760 linked_attributes[0]:
3761      &objs->linked_attributes[i]: struct drsuapi_DsReplicaLinkedAttribute
3762         identifier               : *
3763             identifier: struct drsuapi_DsReplicaObjectIdentifier
3764                 __ndr_size               : 0x0000003a (58)
3765                 __ndr_size_sid           : 0x00000000 (0)
3766                 guid                     : 8e95b6a9-13dd-4158-89db-3220a5be5cc7
3767                 sid                      : S-0-0
3768                 __ndr_size_dn            : 0x00000000 (0)
3769                 dn                       : ''
3770         attid                    : DRSUAPI_ATTRIBUTE_member (0x1F)
3771         value: struct drsuapi_DsAttributeValue
3772             __ndr_size               : 0x0000007e (126)
3773             blob                     : *
3774                 blob                     : DATA_BLOB length=126
3775         flags                    : 0x00000001 (1)
3776                1: DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE
3777         originating_add_time     : Wed Sep  2 22:20:01 2009 EST
3778         meta_data: struct drsuapi_DsReplicaMetaData
3779             version                  : 0x00000015 (21)
3780             originating_change_time  : Wed Sep  2 23:39:07 2009 EST
3781             originating_invocation_id: 794640f3-18cf-40ee-a211-a93992b67a64
3782             originating_usn          : 0x000000000001e19c (123292)
3783
3784 (for cases where the link is to a normal DN)
3785      &target: struct drsuapi_DsReplicaObjectIdentifier3
3786         __ndr_size               : 0x0000007e (126)
3787         __ndr_size_sid           : 0x0000001c (28)
3788         guid                     : 7639e594-db75-4086-b0d4-67890ae46031
3789         sid                      : S-1-5-21-2848215498-2472035911-1947525656-19924
3790         __ndr_size_dn            : 0x00000022 (34)
3791         dn                       : 'CN=UOne,OU=TestOU,DC=vsofs8,DC=com'
3792  */
3793
3794         /* find the attribute being modified */
3795         attr = dsdb_attribute_by_attributeID_id(schema, la->attid);
3796         if (attr == NULL) {
3797                 DEBUG(0, (__location__ ": Unable to find attributeID 0x%x\n", la->attid));
3798                 talloc_free(tmp_ctx);
3799                 return LDB_ERR_OPERATIONS_ERROR;
3800         }
3801
3802         attrs[0] = attr->lDAPDisplayName;
3803         attrs[1] = NULL;
3804
3805         /* get the existing message from the db for the object with
3806            this GUID, returning attribute being modified. We will then
3807            use this msg as the basis for a modify call */
3808         ret = dsdb_module_search(module, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE, attrs,
3809                                  DSDB_FLAG_NEXT_MODULE |
3810                                  DSDB_SEARCH_SEARCH_ALL_PARTITIONS |
3811                                  DSDB_SEARCH_SHOW_DELETED |
3812                                  DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
3813                                  DSDB_SEARCH_REVEAL_INTERNALS,
3814                                  "objectGUID=%s", GUID_string(tmp_ctx, &la->identifier->guid));
3815         if (ret != LDB_SUCCESS) {
3816                 talloc_free(tmp_ctx);
3817                 return ret;
3818         }
3819         if (res->count != 1) {
3820                 ldb_asprintf_errstring(ldb, "DRS linked attribute for GUID %s - DN not found",
3821                                        GUID_string(tmp_ctx, &la->identifier->guid));
3822                 talloc_free(tmp_ctx);
3823                 return LDB_ERR_NO_SUCH_OBJECT;
3824         }
3825         msg = res->msgs[0];
3826
3827         if (msg->num_elements == 0) {
3828                 ret = ldb_msg_add_empty(msg, attr->lDAPDisplayName, LDB_FLAG_MOD_REPLACE, &old_el);
3829                 if (ret != LDB_SUCCESS) {
3830                         ldb_module_oom(module);
3831                         talloc_free(tmp_ctx);
3832                         return LDB_ERR_OPERATIONS_ERROR;
3833                 }
3834         } else {
3835                 old_el = &msg->elements[0];
3836                 old_el->flags = LDB_FLAG_MOD_REPLACE;
3837         }
3838
3839         /* parse the existing links */
3840         ret = get_parsed_dns(module, tmp_ctx, old_el, &pdn_list, attr->syntax->ldap_oid);
3841         if (ret != LDB_SUCCESS) {
3842                 talloc_free(tmp_ctx);
3843                 return ret;
3844         }
3845
3846         /* get our invocationId */
3847         our_invocation_id = samdb_ntds_invocation_id(ldb);
3848         if (!our_invocation_id) {
3849                 ldb_debug_set(ldb, LDB_DEBUG_ERROR, __location__ ": unable to find invocationId\n");
3850                 talloc_free(tmp_ctx);
3851                 return LDB_ERR_OPERATIONS_ERROR;
3852         }
3853
3854         ret = replmd_check_upgrade_links(pdn_list, old_el->num_values, old_el, our_invocation_id);
3855         if (ret != LDB_SUCCESS) {
3856                 talloc_free(tmp_ctx);
3857                 return ret;
3858         }
3859
3860         status = dsdb_dn_la_from_blob(ldb, attr, schema, tmp_ctx, la->value.blob, &dsdb_dn);
3861         if (!W_ERROR_IS_OK(status)) {
3862                 ldb_asprintf_errstring(ldb, "Failed to parsed linked attribute blob for %s on %s - %s\n",
3863                                        old_el->name, ldb_dn_get_linearized(msg->dn), win_errstr(status));
3864                 return LDB_ERR_OPERATIONS_ERROR;
3865         }
3866
3867         ntstatus = dsdb_get_extended_dn_guid(dsdb_dn->dn, &guid, "GUID");
3868         if (!NT_STATUS_IS_OK(ntstatus) && active) {
3869                 ldb_asprintf_errstring(ldb, "Failed to find GUID in linked attribute blob for %s on %s from %s",
3870                                        old_el->name,
3871                                        ldb_dn_get_linearized(dsdb_dn->dn),
3872                                        ldb_dn_get_linearized(msg->dn));
3873                 return LDB_ERR_OPERATIONS_ERROR;
3874         }
3875
3876         /* re-resolve the DN by GUID, as the DRS server may give us an
3877            old DN value */
3878         ret = dsdb_module_dn_by_guid(module, dsdb_dn, &guid, &dsdb_dn->dn);
3879         if (ret != LDB_SUCCESS) {
3880                 DEBUG(2,(__location__ ": WARNING: Failed to re-resolve GUID %s - using %s",
3881                          GUID_string(tmp_ctx, &guid),
3882                          ldb_dn_get_linearized(dsdb_dn->dn)));
3883         }
3884
3885         /* see if this link already exists */
3886         pdn = parsed_dn_find(pdn_list, old_el->num_values, &guid, dsdb_dn->dn);
3887         if (pdn != NULL) {
3888                 /* see if this update is newer than what we have already */
3889                 struct GUID invocation_id = GUID_zero();
3890                 uint32_t version = 0;
3891                 NTTIME change_time = 0;
3892                 uint32_t rmd_flags = dsdb_dn_rmd_flags(pdn->dsdb_dn->dn);
3893
3894                 dsdb_get_extended_dn_guid(pdn->dsdb_dn->dn, &invocation_id, "RMD_INVOCID");
3895                 dsdb_get_extended_dn_uint32(pdn->dsdb_dn->dn, &version, "RMD_VERSION");
3896                 dsdb_get_extended_dn_nttime(pdn->dsdb_dn->dn, &change_time, "RMD_CHANGETIME");
3897
3898                 if (!replmd_update_is_newer(&invocation_id,
3899                                             &la->meta_data.originating_invocation_id,
3900                                             version,
3901                                             la->meta_data.version,
3902                                             change_time,
3903                                             la->meta_data.originating_change_time)) {
3904                         DEBUG(3,("Discarding older DRS linked attribute update to %s on %s from %s\n",
3905                                  old_el->name, ldb_dn_get_linearized(msg->dn),
3906                                  GUID_string(tmp_ctx, &la->meta_data.originating_invocation_id)));
3907                         talloc_free(tmp_ctx);
3908                         return LDB_SUCCESS;
3909                 }
3910
3911                 /* get a seq_num for this change */
3912                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
3913                 if (ret != LDB_SUCCESS) {
3914                         talloc_free(tmp_ctx);
3915                         return ret;
3916                 }
3917
3918                 if (!(rmd_flags & DSDB_RMD_FLAG_DELETED)) {
3919                         /* remove the existing backlink */
3920                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, false, attr, false);
3921                         if (ret != LDB_SUCCESS) {
3922                                 talloc_free(tmp_ctx);
3923                                 return ret;
3924                         }
3925                 }
3926
3927                 ret = replmd_update_la_val(tmp_ctx, pdn->v, dsdb_dn, pdn->dsdb_dn,
3928                                            &la->meta_data.originating_invocation_id,
3929                                            la->meta_data.originating_usn, seq_num,
3930                                            la->meta_data.originating_change_time,
3931                                            la->meta_data.version,
3932                                            !active);
3933                 if (ret != LDB_SUCCESS) {
3934                         talloc_free(tmp_ctx);
3935                         return ret;
3936                 }
3937
3938                 if (active) {
3939                         /* add the new backlink */
3940                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid, true, attr, false);
3941                         if (ret != LDB_SUCCESS) {
3942                                 talloc_free(tmp_ctx);
3943                                 return ret;
3944                         }
3945                 }
3946         } else {
3947                 /* get a seq_num for this change */
3948                 ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num);
3949                 if (ret != LDB_SUCCESS) {
3950                         talloc_free(tmp_ctx);
3951                         return ret;
3952                 }
3953
3954                 old_el->values = talloc_realloc(msg->elements, old_el->values,
3955                                                 struct ldb_val, old_el->num_values+1);
3956                 if (!old_el->values) {
3957                         ldb_module_oom(module);
3958                         return LDB_ERR_OPERATIONS_ERROR;
3959                 }
3960                 old_el->num_values++;
3961
3962                 ret = replmd_build_la_val(tmp_ctx, &old_el->values[old_el->num_values-1], dsdb_dn,
3963                                           &la->meta_data.originating_invocation_id,
3964                                           la->meta_data.originating_usn, seq_num,
3965                                           la->meta_data.originating_change_time,
3966                                           la->meta_data.version,
3967                                           (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?false:true);
3968                 if (ret != LDB_SUCCESS) {
3969                         talloc_free(tmp_ctx);
3970                         return ret;
3971                 }
3972
3973                 if (active) {
3974                         ret = replmd_add_backlink(module, schema, &la->identifier->guid, &guid,
3975                                                   true, attr, false);
3976                         if (ret != LDB_SUCCESS) {
3977                                 talloc_free(tmp_ctx);
3978                                 return ret;
3979                         }
3980                 }
3981         }
3982
3983         /* we only change whenChanged and uSNChanged if the seq_num
3984            has changed */
3985         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
3986                 talloc_free(tmp_ctx);
3987                 return LDB_ERR_OPERATIONS_ERROR;
3988         }
3989
3990         if (add_uint64_element(msg, "uSNChanged", seq_num) != LDB_SUCCESS) {
3991                 talloc_free(tmp_ctx);
3992                 return LDB_ERR_OPERATIONS_ERROR;
3993         }
3994
3995         ret = dsdb_check_single_valued_link(attr, old_el);
3996         if (ret != LDB_SUCCESS) {
3997                 talloc_free(tmp_ctx);
3998                 return ret;
3999         }
4000
4001         ret = dsdb_module_modify(module, msg, DSDB_FLAG_NEXT_MODULE | DSDB_MODIFY_RELAX);
4002         if (ret != LDB_SUCCESS) {
4003                 ldb_debug(ldb, LDB_DEBUG_WARNING, "Failed to apply linked attribute change '%s'\n%s\n",
4004                           ldb_errstring(ldb),
4005                           ldb_ldif_message_string(ldb, tmp_ctx, LDB_CHANGETYPE_MODIFY, msg));
4006                 talloc_free(tmp_ctx);
4007                 return ret;
4008         }
4009
4010         talloc_free(tmp_ctx);
4011
4012         return ret;
4013 }
4014
4015 static int replmd_extended(struct ldb_module *module, struct ldb_request *req)
4016 {
4017         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_REPLICATED_OBJECTS_OID) == 0) {
4018                 return replmd_extended_replicated_objects(module, req);
4019         }
4020
4021         return ldb_next_request(module, req);
4022 }
4023
4024
4025 /*
4026   we hook into the transaction operations to allow us to
4027   perform the linked attribute updates at the end of the whole
4028   transaction. This allows a forward linked attribute to be created
4029   before the object is created. During a vampire, w2k8 sends us linked
4030   attributes before the objects they are part of.
4031  */
4032 static int replmd_start_transaction(struct ldb_module *module)
4033 {
4034         /* create our private structure for this transaction */
4035         struct replmd_private *replmd_private = talloc_get_type(ldb_module_get_private(module),
4036                                                                 struct replmd_private);
4037         replmd_txn_cleanup(replmd_private);
4038
4039         /* free any leftover mod_usn records from cancelled
4040            transactions */
4041         while (replmd_private->ncs) {
4042                 struct nc_entry *e = replmd_private->ncs;
4043                 DLIST_REMOVE(replmd_private->ncs, e);
4044                 talloc_free(e);
4045         }
4046
4047         return ldb_next_start_trans(module);
4048 }
4049
4050 /*
4051   on prepare commit we loop over our queued la_context structures and
4052   apply each of them
4053  */
4054 static int replmd_prepare_commit(struct ldb_module *module)
4055 {
4056         struct replmd_private *replmd_private =
4057                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
4058         struct la_entry *la, *prev;
4059         struct la_backlink *bl;
4060         int ret;
4061
4062         /* walk the list backwards, to do the first entry first, as we
4063          * added the entries with DLIST_ADD() which puts them at the
4064          * start of the list */
4065         for (la = DLIST_TAIL(replmd_private->la_list); la; la=prev) {
4066                 prev = DLIST_PREV(la);
4067                 DLIST_REMOVE(replmd_private->la_list, la);
4068                 ret = replmd_process_linked_attribute(module, la);
4069                 if (ret != LDB_SUCCESS) {
4070                         replmd_txn_cleanup(replmd_private);
4071                         return ret;
4072                 }
4073         }
4074
4075         /* process our backlink list, creating and deleting backlinks
4076            as necessary */
4077         for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
4078                 ret = replmd_process_backlink(module, bl);
4079                 if (ret != LDB_SUCCESS) {
4080                         replmd_txn_cleanup(replmd_private);
4081                         return ret;
4082                 }
4083         }
4084
4085         replmd_txn_cleanup(replmd_private);
4086
4087         /* possibly change @REPLCHANGED */
4088         ret = replmd_notify_store(module);
4089         if (ret != LDB_SUCCESS) {
4090                 return ret;
4091         }
4092
4093         return ldb_next_prepare_commit(module);
4094 }
4095
4096 static int replmd_del_transaction(struct ldb_module *module)
4097 {
4098         struct replmd_private *replmd_private =
4099                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
4100         replmd_txn_cleanup(replmd_private);
4101
4102         return ldb_next_del_trans(module);
4103 }
4104
4105
4106 _PUBLIC_ const struct ldb_module_ops ldb_repl_meta_data_module_ops = {
4107         .name          = "repl_meta_data",
4108         .init_context      = replmd_init,
4109         .add               = replmd_add,
4110         .modify            = replmd_modify,
4111         .rename            = replmd_rename,
4112         .del               = replmd_delete,
4113         .extended          = replmd_extended,
4114         .start_transaction = replmd_start_transaction,
4115         .prepare_commit    = replmd_prepare_commit,
4116         .del_transaction   = replmd_del_transaction,
4117 };