source4/dsdb/samdb/ldb_modules/repl_meta_data.c

   1 /*
   2    ldb database library
   3
   4    Copyright (C) Simo Sorce  2004-2008
   5    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   6    Copyright (C) Andrew Tridgell 2005
   7    Copyright (C) Stefan Metzmacher <metze@samba.org> 2007
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 /*
  24  *  Name: ldb
  25  *
  26  *  Component: ldb repl_meta_data module
  27  *
  28  *  Description: - add a unique objectGUID onto every new record,
  29  *               - handle whenCreated, whenChanged timestamps
  30  *               - handle uSNCreated, uSNChanged numbers
  31  *               - handle replPropertyMetaData attribute
  32  *
  33  *  Author: Simo Sorce
  34  *  Author: Stefan Metzmacher
  35  */
  36
  37 #include "includes.h"
  38 #include "ldb_module.h"
  39 #include "dsdb/samdb/samdb.h"
  40 #include "dsdb/common/proto.h"
  41 #include "../libds/common/flags.h"
  42 #include "librpc/gen_ndr/ndr_misc.h"
  43 #include "librpc/gen_ndr/ndr_drsuapi.h"
  44 #include "librpc/gen_ndr/ndr_drsblobs.h"
  45 #include "param/param.h"
  46 #include "libcli/security/dom_sid.h"
  47 #include "lib/util/dlinklist.h"
  48
  49 struct replmd_private {
  50         TALLOC_CTX *la_ctx;
  51         struct la_entry *la_list;
  52         struct nc_entry {
  53                 struct nc_entry *prev, *next;
  54                 struct ldb_dn *dn;
  55                 uint64_t mod_usn;
  56         } *ncs;
  57 };
  58
  59 struct la_entry {
  60         struct la_entry *next, *prev;
  61         struct drsuapi_DsReplicaLinkedAttribute *la;
  62 };
  63
  64 struct replmd_replicated_request {
  65         struct ldb_module *module;
  66         struct ldb_request *req;
  67
  68         const struct dsdb_schema *schema;
  69
  70         /* the controls we pass down */
  71         struct ldb_control **controls;
  72
  73         /* details for the mode where we apply a bunch of inbound replication meessages */
  74         bool apply_mode;
  75         uint32_t index_current;
  76         struct dsdb_extended_replicated_objects *objs;
  77
  78         struct ldb_message *search_msg;
  79
  80         uint64_t seq_num;
  81
  82 };
  83
  84 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar);
  85
  86 /*
  87   initialise the module
  88   allocate the private structure and build the list
  89   of partition DNs for use by replmd_notify()
  90  */
  91 static int replmd_init(struct ldb_module *module)
  92 {
  93         struct replmd_private *replmd_private;
  94         struct ldb_context *ldb = ldb_module_get_ctx(module);
  95
  96         replmd_private = talloc_zero(module, struct replmd_private);
  97         if (replmd_private == NULL) {
  98                 ldb_oom(ldb);
  99                 return LDB_ERR_OPERATIONS_ERROR;
 100         }
 101         ldb_module_set_private(module, replmd_private);
 102
 103         return ldb_next_init(module);
 104 }
 105
 106
 107 /*
 108  * Callback for most write operations in this module:
 109  *
 110  * notify the repl task that a object has changed. The notifies are
 111  * gathered up in the replmd_private structure then written to the
 112  * @REPLCHANGED object in each partition during the prepare_commit
 113  */
 114 static int replmd_op_callback(struct ldb_request *req, struct ldb_reply *ares)
 115 {
 116         int ret;
 117         struct replmd_replicated_request *ac =
 118                 talloc_get_type_abort(req->context, struct replmd_replicated_request);
 119         struct replmd_private *replmd_private =
 120                 talloc_get_type_abort(ldb_module_get_private(ac->module), struct replmd_private);
 121         struct nc_entry *modified_partition;
 122         struct ldb_control *partition_ctrl;
 123         const struct dsdb_control_current_partition *partition;
 124
 125         struct ldb_control **controls;
 126
 127         partition_ctrl = ldb_reply_get_control(ares, DSDB_CONTROL_CURRENT_PARTITION_OID);
 128
 129         /* Remove the 'partition' control from what we pass up the chain */
 130         controls = controls_except_specified(ares->controls, ares, partition_ctrl);
 131
 132         if (ares->error != LDB_SUCCESS) {
 133                 return ldb_module_done(ac->req, controls,
 134                                         ares->response, ares->error);
 135         }
 136
 137         if (ares->type != LDB_REPLY_DONE) {
 138                 ldb_set_errstring(ldb_module_get_ctx(ac->module), "Invalid reply type for notify\n!");
 139                 return ldb_module_done(ac->req, NULL,
 140                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 141         }
 142
 143         if (!partition_ctrl) {
 144                 return ldb_module_done(ac->req, NULL,
 145                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 146         }
 147
 148         partition = talloc_get_type_abort(partition_ctrl->data,
 149                                     struct dsdb_control_current_partition);
 150
 151         if (ac->seq_num > 0) {
 152                 for (modified_partition = replmd_private->ncs; modified_partition;
 153                      modified_partition = modified_partition->next) {
 154                         if (ldb_dn_compare(modified_partition->dn, partition->dn) == 0) {
 155                                 break;
 156                         }
 157                 }
 158
 159                 if (modified_partition == NULL) {
 160                         modified_partition = talloc_zero(replmd_private, struct nc_entry);
 161                         if (!modified_partition) {
 162                                 ldb_oom(ldb_module_get_ctx(ac->module));
 163                                 return ldb_module_done(ac->req, NULL,
 164                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 165                         }
 166                         modified_partition->dn = ldb_dn_copy(modified_partition, partition->dn);
 167                         if (!modified_partition->dn) {
 168                                 ldb_oom(ldb_module_get_ctx(ac->module));
 169                                 return ldb_module_done(ac->req, NULL,
 170                                                        NULL, LDB_ERR_OPERATIONS_ERROR);
 171                         }
 172                         DLIST_ADD(replmd_private->ncs, modified_partition);
 173                 }
 174
 175                 if (ac->seq_num > modified_partition->mod_usn) {
 176                         modified_partition->mod_usn = ac->seq_num;
 177                 }
 178         }
 179
 180         if (ac->apply_mode) {
 181                 talloc_free(ares);
 182                 ac->index_current++;
 183
 184                 ret = replmd_replicated_apply_next(ac);
 185                 if (ret != LDB_SUCCESS) {
 186                         return ldb_module_done(ac->req, NULL, NULL, ret);
 187                 }
 188                 return ret;
 189         } else {
 190                 /* free the partition control container here, for the
 191                  * common path.  Other cases will have it cleaned up
 192                  * eventually with the ares */
 193                 talloc_free(partition_ctrl);
 194                 return ldb_module_done(ac->req,
 195                                        controls_except_specified(controls, ares, partition_ctrl),
 196                                        ares->response, LDB_SUCCESS);
 197         }
 198 }
 199
 200
 201 /*
 202  * update a @REPLCHANGED record in each partition if there have been
 203  * any writes of replicated data in the partition
 204  */
 205 static int replmd_notify_store(struct ldb_module *module)
 206 {
 207         struct replmd_private *replmd_private =
 208                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
 209         struct ldb_context *ldb = ldb_module_get_ctx(module);
 210
 211         while (replmd_private->ncs) {
 212                 int ret;
 213                 struct nc_entry *modified_partition = replmd_private->ncs;
 214
 215                 ret = dsdb_save_partition_usn(ldb, modified_partition->dn, modified_partition->mod_usn);
 216                 if (ret != LDB_SUCCESS) {
 217                         DEBUG(0,(__location__ ": Failed to save partition uSN for %s\n",
 218                                  ldb_dn_get_linearized(modified_partition->dn)));
 219                         return ret;
 220                 }
 221                 DLIST_REMOVE(replmd_private->ncs, modified_partition);
 222                 talloc_free(modified_partition);
 223         }
 224
 225         return LDB_SUCCESS;
 226 }
 227
 228
 229 /*
 230   created a replmd_replicated_request context
 231  */
 232 static struct replmd_replicated_request *replmd_ctx_init(struct ldb_module *module,
 233                                                          struct ldb_request *req)
 234 {
 235         struct ldb_context *ldb;
 236         struct replmd_replicated_request *ac;
 237
 238         ldb = ldb_module_get_ctx(module);
 239
 240         ac = talloc_zero(req, struct replmd_replicated_request);
 241         if (ac == NULL) {
 242                 ldb_oom(ldb);
 243                 return NULL;
 244         }
 245
 246         ac->module = module;
 247         ac->req = req;
 248
 249         ac->schema = dsdb_get_schema(ldb);
 250         if (!ac->schema) {
 251                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
 252                               "replmd_modify: no dsdb_schema loaded");
 253                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
 254                 return NULL;
 255         }
 256
 257         return ac;
 258 }
 259
 260 /*
 261   add a time element to a record
 262 */
 263 static int add_time_element(struct ldb_message *msg, const char *attr, time_t t)
 264 {
 265         struct ldb_message_element *el;
 266         char *s;
 267
 268         if (ldb_msg_find_element(msg, attr) != NULL) {
 269                 return LDB_SUCCESS;
 270         }
 271
 272         s = ldb_timestring(msg, t);
 273         if (s == NULL) {
 274                 return LDB_ERR_OPERATIONS_ERROR;
 275         }
 276
 277         if (ldb_msg_add_string(msg, attr, s) != LDB_SUCCESS) {
 278                 return LDB_ERR_OPERATIONS_ERROR;
 279         }
 280
 281         el = ldb_msg_find_element(msg, attr);
 282         /* always set as replace. This works because on add ops, the flag
 283            is ignored */
 284         el->flags = LDB_FLAG_MOD_REPLACE;
 285
 286         return LDB_SUCCESS;
 287 }
 288
 289 /*
 290   add a uint64_t element to a record
 291 */
 292 static int add_uint64_element(struct ldb_message *msg, const char *attr, uint64_t v)
 293 {
 294         struct ldb_message_element *el;
 295
 296         if (ldb_msg_find_element(msg, attr) != NULL) {
 297                 return LDB_SUCCESS;
 298         }
 299
 300         if (ldb_msg_add_fmt(msg, attr, "%llu", (unsigned long long)v) != LDB_SUCCESS) {
 301                 return LDB_ERR_OPERATIONS_ERROR;
 302         }
 303
 304         el = ldb_msg_find_element(msg, attr);
 305         /* always set as replace. This works because on add ops, the flag
 306            is ignored */
 307         el->flags = LDB_FLAG_MOD_REPLACE;
 308
 309         return LDB_SUCCESS;
 310 }
 311
 312 static int replmd_replPropertyMetaData1_attid_sort(const struct replPropertyMetaData1 *m1,
 313                                                    const struct replPropertyMetaData1 *m2,
 314                                                    const uint32_t *rdn_attid)
 315 {
 316         if (m1->attid == m2->attid) {
 317                 return 0;
 318         }
 319
 320         /*
 321          * the rdn attribute should be at the end!
 322          * so we need to return a value greater than zero
 323          * which means m1 is greater than m2
 324          */
 325         if (m1->attid == *rdn_attid) {
 326                 return 1;
 327         }
 328
 329         /*
 330          * the rdn attribute should be at the end!
 331          * so we need to return a value less than zero
 332          * which means m2 is greater than m1
 333          */
 334         if (m2->attid == *rdn_attid) {
 335                 return -1;
 336         }
 337
 338         return m1->attid - m2->attid;
 339 }
 340
 341 static int replmd_replPropertyMetaDataCtr1_sort(struct replPropertyMetaDataCtr1 *ctr1,
 342                                                 const struct dsdb_schema *schema,
 343                                                 struct ldb_dn *dn)
 344 {
 345         const char *rdn_name;
 346         const struct dsdb_attribute *rdn_sa;
 347
 348         rdn_name = ldb_dn_get_rdn_name(dn);
 349         if (!rdn_name) {
 350                 DEBUG(0,(__location__ ": No rDN for %s?\n", ldb_dn_get_linearized(dn)));
 351                 return LDB_ERR_OPERATIONS_ERROR;
 352         }
 353
 354         rdn_sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
 355         if (rdn_sa == NULL) {
 356                 DEBUG(0,(__location__ ": No sa found for rDN %s for %s\n", rdn_name, ldb_dn_get_linearized(dn)));
 357                 return LDB_ERR_OPERATIONS_ERROR;
 358         }
 359
 360         DEBUG(6,("Sorting rpmd with attid exception %u rDN=%s DN=%s\n",
 361                  rdn_sa->attributeID_id, rdn_name, ldb_dn_get_linearized(dn)));
 362
 363         ldb_qsort(ctr1->array, ctr1->count, sizeof(struct replPropertyMetaData1),
 364                   discard_const_p(void, &rdn_sa->attributeID_id),
 365                   (ldb_qsort_cmp_fn_t)replmd_replPropertyMetaData1_attid_sort);
 366
 367         return LDB_SUCCESS;
 368 }
 369
 370 static int replmd_ldb_message_element_attid_sort(const struct ldb_message_element *e1,
 371                                                  const struct ldb_message_element *e2,
 372                                                  const struct dsdb_schema *schema)
 373 {
 374         const struct dsdb_attribute *a1;
 375         const struct dsdb_attribute *a2;
 376
 377         /*
 378          * TODO: make this faster by caching the dsdb_attribute pointer
 379          *       on the ldb_messag_element
 380          */
 381
 382         a1 = dsdb_attribute_by_lDAPDisplayName(schema, e1->name);
 383         a2 = dsdb_attribute_by_lDAPDisplayName(schema, e2->name);
 384
 385         /*
 386          * TODO: remove this check, we should rely on e1 and e2 having valid attribute names
 387          *       in the schema
 388          */
 389         if (!a1 || !a2) {
 390                 return strcasecmp(e1->name, e2->name);
 391         }
 392
 393         return a1->attributeID_id - a2->attributeID_id;
 394 }
 395
 396 static void replmd_ldb_message_sort(struct ldb_message *msg,
 397                                     const struct dsdb_schema *schema)
 398 {
 399         ldb_qsort(msg->elements, msg->num_elements, sizeof(struct ldb_message_element),
 400                   discard_const_p(void, schema), (ldb_qsort_cmp_fn_t)replmd_ldb_message_element_attid_sort);
 401 }
 402
 403 static int replmd_add(struct ldb_module *module, struct ldb_request *req)
 404 {
 405         struct ldb_context *ldb;
 406         struct ldb_control *control;
 407         struct ldb_control **saved_controls;
 408         struct replmd_replicated_request *ac;
 409         enum ndr_err_code ndr_err;
 410         struct ldb_request *down_req;
 411         struct ldb_message *msg;
 412         const DATA_BLOB *guid_blob;
 413         struct GUID guid;
 414         struct replPropertyMetaDataBlob nmd;
 415         struct ldb_val nmd_value;
 416         const struct GUID *our_invocation_id;
 417         time_t t = time(NULL);
 418         NTTIME now;
 419         char *time_str;
 420         int ret;
 421         uint32_t i, ni=0;
 422         bool allow_add_guid = false;
 423         bool remove_current_guid = false;
 424
 425         /* check if there's a show relax control (used by provision to say 'I know what I'm doing') */
 426         control = ldb_request_get_control(req, LDB_CONTROL_RELAX_OID);
 427         if (control) {
 428                 allow_add_guid = 1;
 429         }
 430
 431         /* do not manipulate our control entries */
 432         if (ldb_dn_is_special(req->op.add.message->dn)) {
 433                 return ldb_next_request(module, req);
 434         }
 435
 436         ldb = ldb_module_get_ctx(module);
 437
 438         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_add\n");
 439
 440         ac = replmd_ctx_init(module, req);
 441         if (!ac) {
 442                 return LDB_ERR_OPERATIONS_ERROR;
 443         }
 444
 445         guid_blob = ldb_msg_find_ldb_val(req->op.add.message, "objectGUID");
 446         if ( guid_blob != NULL ) {
 447                 if( !allow_add_guid ) {
 448                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 449                               "replmd_add: it's not allowed to add an object with objectGUID\n");
 450                         talloc_free(ac);
 451                         return LDB_ERR_UNWILLING_TO_PERFORM;
 452                 } else {
 453                         NTSTATUS status = GUID_from_data_blob(guid_blob,&guid);
 454                         if ( !NT_STATUS_IS_OK(status)) {
 455                                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 456                                       "replmd_add: Unable to parse as a GUID the attribute objectGUID\n");
 457                                 talloc_free(ac);
 458                                 return LDB_ERR_UNWILLING_TO_PERFORM;
 459                         }
 460                         /* we remove this attribute as it can be a string and will not be treated
 461                         correctly and then we will readd it latter on in the good format*/
 462                         remove_current_guid = true;
 463                 }
 464         } else {
 465                 /* a new GUID */
 466                 guid = GUID_random();
 467         }
 468
 469         /* Get a sequence number from the backend */
 470         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
 471         if (ret != LDB_SUCCESS) {
 472                 talloc_free(ac);
 473                 return ret;
 474         }
 475
 476         /* get our invocationId */
 477         our_invocation_id = samdb_ntds_invocation_id(ldb);
 478         if (!our_invocation_id) {
 479                 ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 480                               "replmd_add: unable to find invocationId\n");
 481                 talloc_free(ac);
 482                 return LDB_ERR_OPERATIONS_ERROR;
 483         }
 484
 485         /* we have to copy the message as the caller might have it as a const */
 486         msg = ldb_msg_copy_shallow(ac, req->op.add.message);
 487         if (msg == NULL) {
 488                 ldb_oom(ldb);
 489                 talloc_free(ac);
 490                 return LDB_ERR_OPERATIONS_ERROR;
 491         }
 492
 493         /* generated times */
 494         unix_to_nt_time(&now, t);
 495         time_str = ldb_timestring(msg, t);
 496         if (!time_str) {
 497                 ldb_oom(ldb);
 498                 talloc_free(ac);
 499                 return LDB_ERR_OPERATIONS_ERROR;
 500         }
 501         if (remove_current_guid) {
 502                 ldb_msg_remove_attr(msg,"objectGUID");
 503         }
 504
 505         /*
 506          * remove autogenerated attributes
 507          */
 508         ldb_msg_remove_attr(msg, "whenCreated");
 509         ldb_msg_remove_attr(msg, "whenChanged");
 510         ldb_msg_remove_attr(msg, "uSNCreated");
 511         ldb_msg_remove_attr(msg, "uSNChanged");
 512         ldb_msg_remove_attr(msg, "replPropertyMetaData");
 513
 514         /*
 515          * readd replicated attributes
 516          */
 517         ret = ldb_msg_add_string(msg, "whenCreated", time_str);
 518         if (ret != LDB_SUCCESS) {
 519                 ldb_oom(ldb);
 520                 talloc_free(ac);
 521                 return ret;
 522         }
 523
 524         /* build the replication meta_data */
 525         ZERO_STRUCT(nmd);
 526         nmd.version             = 1;
 527         nmd.ctr.ctr1.count      = msg->num_elements;
 528         nmd.ctr.ctr1.array      = talloc_array(msg,
 529                                                struct replPropertyMetaData1,
 530                                                nmd.ctr.ctr1.count);
 531         if (!nmd.ctr.ctr1.array) {
 532                 ldb_oom(ldb);
 533                 talloc_free(ac);
 534                 return LDB_ERR_OPERATIONS_ERROR;
 535         }
 536
 537         for (i=0; i < msg->num_elements; i++) {
 538                 struct ldb_message_element *e = &msg->elements[i];
 539                 struct replPropertyMetaData1 *m = &nmd.ctr.ctr1.array[ni];
 540                 const struct dsdb_attribute *sa;
 541
 542                 if (e->name[0] == '@') continue;
 543
 544                 sa = dsdb_attribute_by_lDAPDisplayName(ac->schema, e->name);
 545                 if (!sa) {
 546                         ldb_debug_set(ldb, LDB_DEBUG_ERROR,
 547                                       "replmd_add: attribute '%s' not defined in schema\n",
 548                                       e->name);
 549                         talloc_free(ac);
 550                         return LDB_ERR_NO_SUCH_ATTRIBUTE;
 551                 }
 552
 553                 if ((sa->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (sa->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
 554                         /* if the attribute is not replicated (0x00000001)
 555                          * or constructed (0x00000004) it has no metadata
 556                          */
 557                         continue;
 558                 }
 559
 560                 m->attid                        = sa->attributeID_id;
 561                 m->version                      = 1;
 562                 m->originating_change_time      = now;
 563                 m->originating_invocation_id    = *our_invocation_id;
 564                 m->originating_usn              = ac->seq_num;
 565                 m->local_usn                    = ac->seq_num;
 566                 ni++;
 567         }
 568
 569         /* fix meta data count */
 570         nmd.ctr.ctr1.count = ni;
 571
 572         /*
 573          * sort meta data array, and move the rdn attribute entry to the end
 574          */
 575         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ac->schema, msg->dn);
 576         if (ret != LDB_SUCCESS) {
 577                 talloc_free(ac);
 578                 return ret;
 579         }
 580
 581         /* generated NDR encoded values */
 582         ndr_err = ndr_push_struct_blob(&nmd_value, msg,
 583                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
 584                                        &nmd,
 585                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
 586         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 587                 ldb_oom(ldb);
 588                 talloc_free(ac);
 589                 return LDB_ERR_OPERATIONS_ERROR;
 590         }
 591
 592         /*
 593          * add the autogenerated values
 594          */
 595         ret = dsdb_msg_add_guid(msg, &guid, "objectGUID");
 596         if (ret != LDB_SUCCESS) {
 597                 ldb_oom(ldb);
 598                 talloc_free(ac);
 599                 return ret;
 600         }
 601         ret = ldb_msg_add_string(msg, "whenChanged", time_str);
 602         if (ret != LDB_SUCCESS) {
 603                 ldb_oom(ldb);
 604                 talloc_free(ac);
 605                 return ret;
 606         }
 607         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ac->seq_num);
 608         if (ret != LDB_SUCCESS) {
 609                 ldb_oom(ldb);
 610                 talloc_free(ac);
 611                 return ret;
 612         }
 613         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ac->seq_num);
 614         if (ret != LDB_SUCCESS) {
 615                 ldb_oom(ldb);
 616                 talloc_free(ac);
 617                 return ret;
 618         }
 619         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
 620         if (ret != LDB_SUCCESS) {
 621                 ldb_oom(ldb);
 622                 talloc_free(ac);
 623                 return ret;
 624         }
 625
 626         /*
 627          * sort the attributes by attid before storing the object
 628          */
 629         replmd_ldb_message_sort(msg, ac->schema);
 630
 631         ret = ldb_build_add_req(&down_req, ldb, ac,
 632                                 msg,
 633                                 req->controls,
 634                                 ac, replmd_op_callback,
 635                                 req);
 636         if (ret != LDB_SUCCESS) {
 637                 talloc_free(ac);
 638                 return ret;
 639         }
 640
 641         /* if a control is there remove if from the modified request */
 642         if (control && !save_controls(control, down_req, &saved_controls)) {
 643                 talloc_free(ac);
 644                 return LDB_ERR_OPERATIONS_ERROR;
 645         }
 646
 647         /* go on with the call chain */
 648         return ldb_next_request(module, down_req);
 649 }
 650
 651
 652 /*
 653  * update the replPropertyMetaData for one element
 654  */
 655 static int replmd_update_rpmd_element(struct ldb_context *ldb,
 656                                       struct ldb_message *msg,
 657                                       struct ldb_message_element *el,
 658                                       struct replPropertyMetaDataBlob *omd,
 659                                       const struct dsdb_schema *schema,
 660                                       uint64_t *seq_num,
 661                                       const struct GUID *our_invocation_id,
 662                                       NTTIME now)
 663 {
 664         int i;
 665         const struct dsdb_attribute *a;
 666         struct replPropertyMetaData1 *md1;
 667
 668         a = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
 669         if (a == NULL) {
 670                 DEBUG(0,(__location__ ": Unable to find attribute %s in schema\n",
 671                          el->name));
 672                 return LDB_ERR_OPERATIONS_ERROR;
 673         }
 674
 675         if ((a->systemFlags & DS_FLAG_ATTR_NOT_REPLICATED) || (a->systemFlags & DS_FLAG_ATTR_IS_CONSTRUCTED)) {
 676                 return LDB_SUCCESS;
 677         }
 678
 679         for (i=0; i<omd->ctr.ctr1.count; i++) {
 680                 if (a->attributeID_id == omd->ctr.ctr1.array[i].attid) break;
 681         }
 682         if (i == omd->ctr.ctr1.count) {
 683                 /* we need to add a new one */
 684                 omd->ctr.ctr1.array = talloc_realloc(msg, omd->ctr.ctr1.array,
 685                                                      struct replPropertyMetaData1, omd->ctr.ctr1.count+1);
 686                 if (omd->ctr.ctr1.array == NULL) {
 687                         ldb_oom(ldb);
 688                         return LDB_ERR_OPERATIONS_ERROR;
 689                 }
 690                 omd->ctr.ctr1.count++;
 691                 ZERO_STRUCT(omd->ctr.ctr1.array[i]);
 692         }
 693
 694         /* Get a new sequence number from the backend. We only do this
 695          * if we have a change that requires a new
 696          * replPropertyMetaData element
 697          */
 698         if (*seq_num == 0) {
 699                 int ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num);
 700                 if (ret != LDB_SUCCESS) {
 701                         return LDB_ERR_OPERATIONS_ERROR;
 702                 }
 703         }
 704
 705         md1 = &omd->ctr.ctr1.array[i];
 706         md1->version++;
 707         md1->attid                     = a->attributeID_id;
 708         md1->originating_change_time   = now;
 709         md1->originating_invocation_id = *our_invocation_id;
 710         md1->originating_usn           = *seq_num;
 711         md1->local_usn                 = *seq_num;
 712
 713         return LDB_SUCCESS;
 714 }
 715
 716 /*
 717  * update the replPropertyMetaData object each time we modify an
 718  * object. This is needed for DRS replication, as the merge on the
 719  * client is based on this object
 720  */
 721 static int replmd_update_rpmd(struct ldb_module *module,
 722                               const struct dsdb_schema *schema,
 723                               struct ldb_message *msg, uint64_t *seq_num)
 724 {
 725         const struct ldb_val *omd_value;
 726         enum ndr_err_code ndr_err;
 727         struct replPropertyMetaDataBlob omd;
 728         int i;
 729         time_t t = time(NULL);
 730         NTTIME now;
 731         const struct GUID *our_invocation_id;
 732         int ret;
 733         const char *attrs[] = { "replPropertyMetaData" , NULL };
 734         struct ldb_result *res;
 735         struct ldb_context *ldb;
 736
 737         ldb = ldb_module_get_ctx(module);
 738
 739         our_invocation_id = samdb_ntds_invocation_id(ldb);
 740         if (!our_invocation_id) {
 741                 /* this happens during an initial vampire while
 742                    updating the schema */
 743                 DEBUG(5,("No invocationID - skipping replPropertyMetaData update\n"));
 744                 return LDB_SUCCESS;
 745         }
 746
 747         unix_to_nt_time(&now, t);
 748
 749         /* search for the existing replPropertyMetaDataBlob */
 750         ret = dsdb_search_dn_with_deleted(ldb, msg, &res, msg->dn, attrs);
 751         if (ret != LDB_SUCCESS || res->count != 1) {
 752                 DEBUG(0,(__location__ ": Object %s failed to find replPropertyMetaData\n",
 753                          ldb_dn_get_linearized(msg->dn)));
 754                 return LDB_ERR_OPERATIONS_ERROR;
 755         }
 756
 757
 758         omd_value = ldb_msg_find_ldb_val(res->msgs[0], "replPropertyMetaData");
 759         if (!omd_value) {
 760                 DEBUG(0,(__location__ ": Object %s does not have a replPropertyMetaData attribute\n",
 761                          ldb_dn_get_linearized(msg->dn)));
 762                 return LDB_ERR_OPERATIONS_ERROR;
 763         }
 764
 765         ndr_err = ndr_pull_struct_blob(omd_value, msg,
 766                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &omd,
 767                                        (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
 768         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 769                 DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
 770                          ldb_dn_get_linearized(msg->dn)));
 771                 return LDB_ERR_OPERATIONS_ERROR;
 772         }
 773
 774         if (omd.version != 1) {
 775                 DEBUG(0,(__location__ ": bad version %u in replPropertyMetaData for %s\n",
 776                          omd.version, ldb_dn_get_linearized(msg->dn)));
 777                 return LDB_ERR_OPERATIONS_ERROR;
 778         }
 779
 780         for (i=0; i<msg->num_elements; i++) {
 781                 ret = replmd_update_rpmd_element(ldb, msg, &msg->elements[i], &omd, schema, seq_num,
 782                                                  our_invocation_id, now);
 783                 if (ret != LDB_SUCCESS) {
 784                         return ret;
 785                 }
 786         }
 787
 788         /*
 789          * replmd_update_rpmd_element has done an update if the
 790          * seq_num is set
 791          */
 792         if (*seq_num != 0) {
 793                 struct ldb_val *md_value;
 794                 struct ldb_message_element *el;
 795
 796                 md_value = talloc(msg, struct ldb_val);
 797                 if (md_value == NULL) {
 798                         ldb_oom(ldb);
 799                         return LDB_ERR_OPERATIONS_ERROR;
 800                 }
 801
 802                 ret = replmd_replPropertyMetaDataCtr1_sort(&omd.ctr.ctr1, schema, msg->dn);
 803                 if (ret != LDB_SUCCESS) {
 804                         return ret;
 805                 }
 806
 807                 ndr_err = ndr_push_struct_blob(md_value, msg,
 808                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
 809                                                &omd,
 810                                                (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
 811                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 812                         DEBUG(0,(__location__ ": Failed to marshall replPropertyMetaData for %s\n",
 813                                  ldb_dn_get_linearized(msg->dn)));
 814                         return LDB_ERR_OPERATIONS_ERROR;
 815                 }
 816
 817                 ret = ldb_msg_add_empty(msg, "replPropertyMetaData", LDB_FLAG_MOD_REPLACE, &el);
 818                 if (ret != LDB_SUCCESS) {
 819                         DEBUG(0,(__location__ ": Failed to add updated replPropertyMetaData %s\n",
 820                                  ldb_dn_get_linearized(msg->dn)));
 821                         return ret;
 822                 }
 823
 824                 el->num_values = 1;
 825                 el->values = md_value;
 826         }
 827
 828         return LDB_SUCCESS;
 829 }
 830
 831
 832 static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
 833 {
 834         struct ldb_context *ldb;
 835         struct replmd_replicated_request *ac;
 836         struct ldb_request *down_req;
 837         struct ldb_message *msg;
 838         struct ldb_result *res;
 839         time_t t = time(NULL);
 840         uint64_t seq_num = 0;
 841         int ret;
 842
 843         /* do not manipulate our control entries */
 844         if (ldb_dn_is_special(req->op.mod.message->dn)) {
 845                 return ldb_next_request(module, req);
 846         }
 847
 848         ldb = ldb_module_get_ctx(module);
 849
 850         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_modify\n");
 851
 852         ac = replmd_ctx_init(module, req);
 853         if (!ac) {
 854                 return LDB_ERR_OPERATIONS_ERROR;
 855         }
 856
 857         /* we have to copy the message as the caller might have it as a const */
 858         msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
 859         if (msg == NULL) {
 860                 ldb_oom(ldb);
 861                 talloc_free(ac);
 862                 return LDB_ERR_OPERATIONS_ERROR;
 863         }
 864
 865         /* TODO:
 866          * - give an error when a readonly attribute should
 867          *   be modified
 868          * - merge the changed into the old object
 869          *   if the caller set values to the same value
 870          *   ignore the attribute, return success when no
 871          *   attribute was changed
 872          */
 873
 874         ret = dsdb_search_dn_with_deleted(ldb, msg, &res, msg->dn, NULL);
 875         if (ret != LDB_SUCCESS) {
 876                 talloc_free(ac);
 877                 return ret;
 878         }
 879
 880         ret = replmd_update_rpmd(module, ac->schema, msg, &ac->seq_num);
 881         if (ret != LDB_SUCCESS) {
 882                 talloc_free(ac);
 883                 return ret;
 884         }
 885
 886         /* TODO:
 887          * - replace the old object with the newly constructed one
 888          */
 889
 890         ret = ldb_build_mod_req(&down_req, ldb, ac,
 891                                 msg,
 892                                 req->controls,
 893                                 ac, replmd_op_callback,
 894                                 req);
 895         if (ret != LDB_SUCCESS) {
 896                 talloc_free(ac);
 897                 return ret;
 898         }
 899         talloc_steal(down_req, msg);
 900
 901         /* we only change whenChanged and uSNChanged if the seq_num
 902            has changed */
 903         if (seq_num != 0) {
 904                 if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
 905                         talloc_free(ac);
 906                         return ret;
 907                 }
 908
 909                 if (add_uint64_element(msg, "uSNChanged", seq_num) != LDB_SUCCESS) {
 910                         talloc_free(ac);
 911                         return ret;
 912                 }
 913         }
 914
 915         /* go on with the call chain */
 916         return ldb_next_request(module, down_req);
 917 }
 918
 919 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares);
 920
 921 /*
 922   handle a rename request
 923
 924   On a rename we need to do an extra ldb_modify which sets the
 925   whenChanged and uSNChanged attributes.  We do this in a callback after the success.
 926  */
 927 static int replmd_rename(struct ldb_module *module, struct ldb_request *req)
 928 {
 929         struct ldb_context *ldb;
 930         struct replmd_replicated_request *ac;
 931         int ret;
 932         struct ldb_request *down_req;
 933
 934         /* do not manipulate our control entries */
 935         if (ldb_dn_is_special(req->op.mod.message->dn)) {
 936                 return ldb_next_request(module, req);
 937         }
 938
 939         ldb = ldb_module_get_ctx(module);
 940
 941         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_rename\n");
 942
 943         ac = replmd_ctx_init(module, req);
 944         if (!ac) {
 945                 return LDB_ERR_OPERATIONS_ERROR;
 946         }
 947         ret = ldb_build_rename_req(&down_req, ldb, ac,
 948                                    ac->req->op.rename.olddn,
 949                                    ac->req->op.rename.newdn,
 950                                    ac->req->controls,
 951                                    ac, replmd_rename_callback,
 952                                    ac->req);
 953
 954         if (ret != LDB_SUCCESS) {
 955                 talloc_free(ac);
 956                 return ret;
 957         }
 958
 959         /* go on with the call chain */
 960         return ldb_next_request(module, down_req);
 961 }
 962
 963 /* After the rename is compleated, update the whenchanged etc */
 964 static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *ares)
 965 {
 966         struct ldb_context *ldb;
 967         struct replmd_replicated_request *ac;
 968         struct ldb_request *down_req;
 969         struct ldb_message *msg;
 970         time_t t = time(NULL);
 971         int ret;
 972
 973         ac = talloc_get_type(req->context, struct replmd_replicated_request);
 974         ldb = ldb_module_get_ctx(ac->module);
 975
 976         if (ares->error != LDB_SUCCESS) {
 977                 return ldb_module_done(ac->req, ares->controls,
 978                                         ares->response, ares->error);
 979         }
 980
 981         if (ares->type != LDB_REPLY_DONE) {
 982                 ldb_set_errstring(ldb,
 983                                   "invalid ldb_reply_type in callback");
 984                 talloc_free(ares);
 985                 return ldb_module_done(ac->req, NULL, NULL,
 986                                         LDB_ERR_OPERATIONS_ERROR);
 987         }
 988
 989         /* Get a sequence number from the backend */
 990         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
 991         if (ret != LDB_SUCCESS) {
 992                 return ret;
 993         }
 994
 995         /* TODO:
 996          * - replace the old object with the newly constructed one
 997          */
 998
 999         msg = ldb_msg_new(ac);
1000         if (msg == NULL) {
1001                 ldb_oom(ldb);
1002                 return LDB_ERR_OPERATIONS_ERROR;
1003         }
1004
1005         msg->dn = ac->req->op.rename.newdn;
1006
1007         ret = ldb_build_mod_req(&down_req, ldb, ac,
1008                                 msg,
1009                                 req->controls,
1010                                 ac, replmd_op_callback,
1011                                 req);
1012
1013         if (ret != LDB_SUCCESS) {
1014                 talloc_free(ac);
1015                 return ret;
1016         }
1017         talloc_steal(down_req, msg);
1018
1019         if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
1020                 talloc_free(ac);
1021                 return ret;
1022         }
1023
1024         if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
1025                 talloc_free(ac);
1026                 return ret;
1027         }
1028
1029         /* go on with the call chain - do the modify after the rename */
1030         return ldb_next_request(ac->module, down_req);
1031 }
1032
1033
1034 static int replmd_replicated_request_error(struct replmd_replicated_request *ar, int ret)
1035 {
1036         return ret;
1037 }
1038
1039 static int replmd_replicated_request_werror(struct replmd_replicated_request *ar, WERROR status)
1040 {
1041         int ret = LDB_ERR_OTHER;
1042         /* TODO: do some error mapping */
1043         return ret;
1044 }
1045
1046 static int replmd_replicated_apply_add(struct replmd_replicated_request *ar)
1047 {
1048         struct ldb_context *ldb;
1049         struct ldb_request *change_req;
1050         enum ndr_err_code ndr_err;
1051         struct ldb_message *msg;
1052         struct replPropertyMetaDataBlob *md;
1053         struct ldb_val md_value;
1054         uint32_t i;
1055         int ret;
1056
1057         /*
1058          * TODO: check if the parent object exist
1059          */
1060
1061         /*
1062          * TODO: handle the conflict case where an object with the
1063          *       same name exist
1064          */
1065
1066         ldb = ldb_module_get_ctx(ar->module);
1067         msg = ar->objs->objects[ar->index_current].msg;
1068         md = ar->objs->objects[ar->index_current].meta_data;
1069
1070         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
1071         if (ret != LDB_SUCCESS) {
1072                 return replmd_replicated_request_error(ar, ret);
1073         }
1074
1075         ret = ldb_msg_add_value(msg, "objectGUID", &ar->objs->objects[ar->index_current].guid_value, NULL);
1076         if (ret != LDB_SUCCESS) {
1077                 return replmd_replicated_request_error(ar, ret);
1078         }
1079
1080         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
1081         if (ret != LDB_SUCCESS) {
1082                 return replmd_replicated_request_error(ar, ret);
1083         }
1084
1085         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNCreated", ar->seq_num);
1086         if (ret != LDB_SUCCESS) {
1087                 return replmd_replicated_request_error(ar, ret);
1088         }
1089
1090         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
1091         if (ret != LDB_SUCCESS) {
1092                 return replmd_replicated_request_error(ar, ret);
1093         }
1094
1095         /* remove any message elements that have zero values */
1096         for (i=0; i<msg->num_elements; i++) {
1097                 if (msg->elements[i].num_values == 0) {
1098                         DEBUG(4,(__location__ ": Removing attribute %s with num_values==0\n",
1099                                  msg->elements[i].name));
1100                         memmove(&msg->elements[i],
1101                                 &msg->elements[i+1],
1102                                 sizeof(msg->elements[i])*(msg->num_elements - (i+1)));
1103                         msg->num_elements--;
1104                         i--;
1105                 }
1106         }
1107
1108         /*
1109          * the meta data array is already sorted by the caller
1110          */
1111         for (i=0; i < md->ctr.ctr1.count; i++) {
1112                 md->ctr.ctr1.array[i].local_usn = ar->seq_num;
1113         }
1114         ndr_err = ndr_push_struct_blob(&md_value, msg,
1115                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
1116                                        md,
1117                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
1118         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1119                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
1120                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
1121         }
1122         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &md_value, NULL);
1123         if (ret != LDB_SUCCESS) {
1124                 return replmd_replicated_request_error(ar, ret);
1125         }
1126
1127         replmd_ldb_message_sort(msg, ar->schema);
1128
1129         if (DEBUGLVL(4)) {
1130                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_ADD, msg);
1131                 DEBUG(4, ("DRS replication add message:\n%s\n", s));
1132                 talloc_free(s);
1133         }
1134
1135         ret = ldb_build_add_req(&change_req,
1136                                 ldb,
1137                                 ar,
1138                                 msg,
1139                                 ar->controls,
1140                                 ar,
1141                                 replmd_op_callback,
1142                                 ar->req);
1143         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
1144
1145         return ldb_next_request(ar->module, change_req);
1146 }
1147
1148 static int replmd_replPropertyMetaData1_conflict_compare(struct replPropertyMetaData1 *m1,
1149                                                          struct replPropertyMetaData1 *m2)
1150 {
1151         int ret;
1152
1153         if (m1->version != m2->version) {
1154                 return m1->version - m2->version;
1155         }
1156
1157         if (m1->originating_change_time != m2->originating_change_time) {
1158                 return m1->originating_change_time - m2->originating_change_time;
1159         }
1160
1161         ret = GUID_compare(&m1->originating_invocation_id, &m2->originating_invocation_id);
1162         if (ret != 0) {
1163                 return ret;
1164         }
1165
1166         return m1->originating_usn - m2->originating_usn;
1167 }
1168
1169 static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
1170 {
1171         struct ldb_context *ldb;
1172         struct ldb_request *change_req;
1173         enum ndr_err_code ndr_err;
1174         struct ldb_message *msg;
1175         struct replPropertyMetaDataBlob *rmd;
1176         struct replPropertyMetaDataBlob omd;
1177         const struct ldb_val *omd_value;
1178         struct replPropertyMetaDataBlob nmd;
1179         struct ldb_val nmd_value;
1180         uint32_t i,j,ni=0;
1181         uint32_t removed_attrs = 0;
1182         int ret;
1183
1184         ldb = ldb_module_get_ctx(ar->module);
1185         msg = ar->objs->objects[ar->index_current].msg;
1186         rmd = ar->objs->objects[ar->index_current].meta_data;
1187         ZERO_STRUCT(omd);
1188         omd.version = 1;
1189
1190         /*
1191          * TODO: check repl data is correct after a rename
1192          */
1193         if (ldb_dn_compare(msg->dn, ar->search_msg->dn) != 0) {
1194                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_request rename %s => %s\n",
1195                           ldb_dn_get_linearized(ar->search_msg->dn),
1196                           ldb_dn_get_linearized(msg->dn));
1197                 if (ldb_rename(ldb, ar->search_msg->dn, msg->dn) != LDB_SUCCESS) {
1198                         ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_replicated_request rename %s => %s failed - %s\n",
1199                                   ldb_dn_get_linearized(ar->search_msg->dn),
1200                                   ldb_dn_get_linearized(msg->dn),
1201                                   ldb_errstring(ldb));
1202                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_DB_ERROR);
1203                 }
1204         }
1205
1206         /* find existing meta data */
1207         omd_value = ldb_msg_find_ldb_val(ar->search_msg, "replPropertyMetaData");
1208         if (omd_value) {
1209                 ndr_err = ndr_pull_struct_blob(omd_value, ar,
1210                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &omd,
1211                                                (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
1212                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1213                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
1214                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
1215                 }
1216
1217                 if (omd.version != 1) {
1218                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
1219                 }
1220         }
1221
1222         ZERO_STRUCT(nmd);
1223         nmd.version = 1;
1224         nmd.ctr.ctr1.count = omd.ctr.ctr1.count + rmd->ctr.ctr1.count;
1225         nmd.ctr.ctr1.array = talloc_array(ar,
1226                                           struct replPropertyMetaData1,
1227                                           nmd.ctr.ctr1.count);
1228         if (!nmd.ctr.ctr1.array) return replmd_replicated_request_werror(ar, WERR_NOMEM);
1229
1230         /* first copy the old meta data */
1231         for (i=0; i < omd.ctr.ctr1.count; i++) {
1232                 nmd.ctr.ctr1.array[ni]  = omd.ctr.ctr1.array[i];
1233                 ni++;
1234         }
1235
1236         /* now merge in the new meta data */
1237         for (i=0; i < rmd->ctr.ctr1.count; i++) {
1238                 bool found = false;
1239
1240                 for (j=0; j < ni; j++) {
1241                         int cmp;
1242
1243                         if (rmd->ctr.ctr1.array[i].attid != nmd.ctr.ctr1.array[j].attid) {
1244                                 continue;
1245                         }
1246
1247                         cmp = replmd_replPropertyMetaData1_conflict_compare(&rmd->ctr.ctr1.array[i],
1248                                                                             &nmd.ctr.ctr1.array[j]);
1249                         if (cmp > 0) {
1250                                 /* replace the entry */
1251                                 nmd.ctr.ctr1.array[j] = rmd->ctr.ctr1.array[i];
1252                                 found = true;
1253                                 break;
1254                         }
1255
1256                         /* we don't want to apply this change so remove the attribute */
1257                         ldb_msg_remove_element(msg, &msg->elements[i-removed_attrs]);
1258                         removed_attrs++;
1259
1260                         found = true;
1261                         break;
1262                 }
1263
1264                 if (found) continue;
1265
1266                 nmd.ctr.ctr1.array[ni] = rmd->ctr.ctr1.array[i];
1267                 ni++;
1268         }
1269
1270         /*
1271          * finally correct the size of the meta_data array
1272          */
1273         nmd.ctr.ctr1.count = ni;
1274
1275         /*
1276          * the rdn attribute (the alias for the name attribute),
1277          * 'cn' for most objects is the last entry in the meta data array
1278          * we have stored
1279          *
1280          * sort the new meta data array
1281          */
1282         ret = replmd_replPropertyMetaDataCtr1_sort(&nmd.ctr.ctr1, ar->schema, msg->dn);
1283         if (ret != LDB_SUCCESS) {
1284                 return ret;
1285         }
1286
1287         /*
1288          * check if some replicated attributes left, otherwise skip the ldb_modify() call
1289          */
1290         if (msg->num_elements == 0) {
1291                 ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: skip replace\n",
1292                           ar->index_current);
1293
1294                 ar->index_current++;
1295                 return replmd_replicated_apply_next(ar);
1296         }
1297
1298         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_apply_merge[%u]: replace %u attributes\n",
1299                   ar->index_current, msg->num_elements);
1300
1301         ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ar->seq_num);
1302         if (ret != LDB_SUCCESS) {
1303                 return replmd_replicated_request_error(ar, ret);
1304         }
1305
1306         for (i=0; i<ni; i++) {
1307                 nmd.ctr.ctr1.array[i].local_usn = ar->seq_num;
1308         }
1309
1310         /* create the meta data value */
1311         ndr_err = ndr_push_struct_blob(&nmd_value, msg,
1312                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
1313                                        &nmd,
1314                                        (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
1315         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1316                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
1317                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
1318         }
1319
1320         /*
1321          * when we know that we'll modify the record, add the whenChanged, uSNChanged
1322          * and replPopertyMetaData attributes
1323          */
1324         ret = ldb_msg_add_string(msg, "whenChanged", ar->objs->objects[ar->index_current].when_changed);
1325         if (ret != LDB_SUCCESS) {
1326                 return replmd_replicated_request_error(ar, ret);
1327         }
1328         ret = samdb_msg_add_uint64(ldb, msg, msg, "uSNChanged", ar->seq_num);
1329         if (ret != LDB_SUCCESS) {
1330                 return replmd_replicated_request_error(ar, ret);
1331         }
1332         ret = ldb_msg_add_value(msg, "replPropertyMetaData", &nmd_value, NULL);
1333         if (ret != LDB_SUCCESS) {
1334                 return replmd_replicated_request_error(ar, ret);
1335         }
1336
1337         replmd_ldb_message_sort(msg, ar->schema);
1338
1339         /* we want to replace the old values */
1340         for (i=0; i < msg->num_elements; i++) {
1341                 msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
1342         }
1343
1344         if (DEBUGLVL(4)) {
1345                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
1346                 DEBUG(4, ("DRS replication modify message:\n%s\n", s));
1347                 talloc_free(s);
1348         }
1349
1350         ret = ldb_build_mod_req(&change_req,
1351                                 ldb,
1352                                 ar,
1353                                 msg,
1354                                 ar->controls,
1355                                 ar,
1356                                 replmd_op_callback,
1357                                 ar->req);
1358         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
1359
1360         return ldb_next_request(ar->module, change_req);
1361 }
1362
1363 static int replmd_replicated_apply_search_callback(struct ldb_request *req,
1364                                                    struct ldb_reply *ares)
1365 {
1366         struct replmd_replicated_request *ar = talloc_get_type(req->context,
1367                                                struct replmd_replicated_request);
1368         int ret;
1369
1370         if (!ares) {
1371                 return ldb_module_done(ar->req, NULL, NULL,
1372                                         LDB_ERR_OPERATIONS_ERROR);
1373         }
1374         if (ares->error != LDB_SUCCESS &&
1375             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
1376                 return ldb_module_done(ar->req, ares->controls,
1377                                         ares->response, ares->error);
1378         }
1379
1380         switch (ares->type) {
1381         case LDB_REPLY_ENTRY:
1382                 ar->search_msg = talloc_steal(ar, ares->message);
1383                 break;
1384
1385         case LDB_REPLY_REFERRAL:
1386                 /* we ignore referrals */
1387                 break;
1388
1389         case LDB_REPLY_DONE:
1390                 if (ar->search_msg != NULL) {
1391                         ret = replmd_replicated_apply_merge(ar);
1392                 } else {
1393                         ret = replmd_replicated_apply_add(ar);
1394                 }
1395                 if (ret != LDB_SUCCESS) {
1396                         return ldb_module_done(ar->req, NULL, NULL, ret);
1397                 }
1398         }
1399
1400         talloc_free(ares);
1401         return LDB_SUCCESS;
1402 }
1403
1404 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar);
1405
1406 static int replmd_replicated_apply_next(struct replmd_replicated_request *ar)
1407 {
1408         struct ldb_context *ldb;
1409         int ret;
1410         char *tmp_str;
1411         char *filter;
1412         struct ldb_request *search_req;
1413         struct ldb_search_options_control *options;
1414
1415         if (ar->index_current >= ar->objs->num_objects) {
1416                 /* done with it, go to next stage */
1417                 return replmd_replicated_uptodate_vector(ar);
1418         }
1419
1420         ldb = ldb_module_get_ctx(ar->module);
1421         ar->search_msg = NULL;
1422
1423         tmp_str = ldb_binary_encode(ar, ar->objs->objects[ar->index_current].guid_value);
1424         if (!tmp_str) return replmd_replicated_request_werror(ar, WERR_NOMEM);
1425
1426         filter = talloc_asprintf(ar, "(objectGUID=%s)", tmp_str);
1427         if (!filter) return replmd_replicated_request_werror(ar, WERR_NOMEM);
1428         talloc_free(tmp_str);
1429
1430         ret = ldb_build_search_req(&search_req,
1431                                    ldb,
1432                                    ar,
1433                                    NULL,
1434                                    LDB_SCOPE_SUBTREE,
1435                                    filter,
1436                                    NULL,
1437                                    NULL,
1438                                    ar,
1439                                    replmd_replicated_apply_search_callback,
1440                                    ar->req);
1441
1442         ret = ldb_request_add_control(search_req, LDB_CONTROL_SHOW_DELETED_OID, true, NULL);
1443         if (ret != LDB_SUCCESS) {
1444                 return ret;
1445         }
1446
1447         /* we need to cope with cross-partition links, so search for
1448            the GUID over all partitions */
1449         options = talloc(search_req, struct ldb_search_options_control);
1450         if (options == NULL) {
1451                 DEBUG(0, (__location__ ": out of memory\n"));
1452                 return LDB_ERR_OPERATIONS_ERROR;
1453         }
1454         options->search_options = LDB_SEARCH_OPTION_PHANTOM_ROOT;
1455
1456         ret = ldb_request_add_control(search_req,
1457                                       LDB_CONTROL_SEARCH_OPTIONS_OID,
1458                                       true, options);
1459         if (ret != LDB_SUCCESS) {
1460                 return ret;
1461         }
1462
1463         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
1464
1465         return ldb_next_request(ar->module, search_req);
1466 }
1467
1468 static int replmd_replicated_uptodate_modify_callback(struct ldb_request *req,
1469                                                       struct ldb_reply *ares)
1470 {
1471         struct ldb_context *ldb;
1472         struct replmd_replicated_request *ar = talloc_get_type(req->context,
1473                                                struct replmd_replicated_request);
1474         ldb = ldb_module_get_ctx(ar->module);
1475
1476         if (!ares) {
1477                 return ldb_module_done(ar->req, NULL, NULL,
1478                                         LDB_ERR_OPERATIONS_ERROR);
1479         }
1480         if (ares->error != LDB_SUCCESS) {
1481                 return ldb_module_done(ar->req, ares->controls,
1482                                         ares->response, ares->error);
1483         }
1484
1485         if (ares->type != LDB_REPLY_DONE) {
1486                 ldb_set_errstring(ldb, "Invalid reply type\n!");
1487                 return ldb_module_done(ar->req, NULL, NULL,
1488                                         LDB_ERR_OPERATIONS_ERROR);
1489         }
1490
1491         talloc_free(ares);
1492
1493         return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
1494 }
1495
1496 static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *ar)
1497 {
1498         struct ldb_context *ldb;
1499         struct ldb_request *change_req;
1500         enum ndr_err_code ndr_err;
1501         struct ldb_message *msg;
1502         struct replUpToDateVectorBlob ouv;
1503         const struct ldb_val *ouv_value;
1504         const struct drsuapi_DsReplicaCursor2CtrEx *ruv;
1505         struct replUpToDateVectorBlob nuv;
1506         struct ldb_val nuv_value;
1507         struct ldb_message_element *nuv_el = NULL;
1508         const struct GUID *our_invocation_id;
1509         struct ldb_message_element *orf_el = NULL;
1510         struct repsFromToBlob nrf;
1511         struct ldb_val *nrf_value = NULL;
1512         struct ldb_message_element *nrf_el = NULL;
1513         uint32_t i,j,ni=0;
1514         bool found = false;
1515         time_t t = time(NULL);
1516         NTTIME now;
1517         int ret;
1518
1519         ldb = ldb_module_get_ctx(ar->module);
1520         ruv = ar->objs->uptodateness_vector;
1521         ZERO_STRUCT(ouv);
1522         ouv.version = 2;
1523         ZERO_STRUCT(nuv);
1524         nuv.version = 2;
1525
1526         unix_to_nt_time(&now, t);
1527
1528         /*
1529          * first create the new replUpToDateVector
1530          */
1531         ouv_value = ldb_msg_find_ldb_val(ar->search_msg, "replUpToDateVector");
1532         if (ouv_value) {
1533                 ndr_err = ndr_pull_struct_blob(ouv_value, ar,
1534                                                lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), &ouv,
1535                                                (ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob);
1536                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1537                         NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
1538                         return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
1539                 }
1540
1541                 if (ouv.version != 2) {
1542                         return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
1543                 }
1544         }
1545
1546         /*
1547          * the new uptodateness vector will at least
1548          * contain 1 entry, one for the source_dsa
1549          *
1550          * plus optional values from our old vector and the one from the source_dsa
1551          */
1552         nuv.ctr.ctr2.count = 1 + ouv.ctr.ctr2.count;
1553         if (ruv) nuv.ctr.ctr2.count += ruv->count;
1554         nuv.ctr.ctr2.cursors = talloc_array(ar,
1555                                             struct drsuapi_DsReplicaCursor2,
1556                                             nuv.ctr.ctr2.count);
1557         if (!nuv.ctr.ctr2.cursors) return replmd_replicated_request_werror(ar, WERR_NOMEM);
1558
1559         /* first copy the old vector */
1560         for (i=0; i < ouv.ctr.ctr2.count; i++) {
1561                 nuv.ctr.ctr2.cursors[ni] = ouv.ctr.ctr2.cursors[i];
1562                 ni++;
1563         }
1564
1565         /* get our invocation_id if we have one already attached to the ldb */
1566         our_invocation_id = samdb_ntds_invocation_id(ldb);
1567
1568         /* merge in the source_dsa vector is available */
1569         for (i=0; (ruv && i < ruv->count); i++) {
1570                 found = false;
1571
1572                 if (our_invocation_id &&
1573                     GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
1574                                our_invocation_id)) {
1575                         continue;
1576                 }
1577
1578                 for (j=0; j < ni; j++) {
1579                         if (!GUID_equal(&ruv->cursors[i].source_dsa_invocation_id,
1580                                         &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
1581                                 continue;
1582                         }
1583
1584                         found = true;
1585
1586                         /*
1587                          * we update only the highest_usn and not the latest_sync_success time,
1588                          * because the last success stands for direct replication
1589                          */
1590                         if (ruv->cursors[i].highest_usn > nuv.ctr.ctr2.cursors[j].highest_usn) {
1591                                 nuv.ctr.ctr2.cursors[j].highest_usn = ruv->cursors[i].highest_usn;
1592                         }
1593                         break;
1594                 }
1595
1596                 if (found) continue;
1597
1598                 /* if it's not there yet, add it */
1599                 nuv.ctr.ctr2.cursors[ni] = ruv->cursors[i];
1600                 ni++;
1601         }
1602
1603         /*
1604          * merge in the current highwatermark for the source_dsa
1605          */
1606         found = false;
1607         for (j=0; j < ni; j++) {
1608                 if (!GUID_equal(&ar->objs->source_dsa->source_dsa_invocation_id,
1609                                 &nuv.ctr.ctr2.cursors[j].source_dsa_invocation_id)) {
1610                         continue;
1611                 }
1612
1613                 found = true;
1614
1615                 /*
1616                  * here we update the highest_usn and last_sync_success time
1617                  * because we're directly replicating from the source_dsa
1618                  *
1619                  * and use the tmp_highest_usn because this is what we have just applied
1620                  * to our ldb
1621                  */
1622                 nuv.ctr.ctr2.cursors[j].highest_usn             = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
1623                 nuv.ctr.ctr2.cursors[j].last_sync_success       = now;
1624                 break;
1625         }
1626         if (!found) {
1627                 /*
1628                  * here we update the highest_usn and last_sync_success time
1629                  * because we're directly replicating from the source_dsa
1630                  *
1631                  * and use the tmp_highest_usn because this is what we have just applied
1632                  * to our ldb
1633                  */
1634                 nuv.ctr.ctr2.cursors[ni].source_dsa_invocation_id= ar->objs->source_dsa->source_dsa_invocation_id;
1635                 nuv.ctr.ctr2.cursors[ni].highest_usn            = ar->objs->source_dsa->highwatermark.tmp_highest_usn;
1636                 nuv.ctr.ctr2.cursors[ni].last_sync_success      = now;
1637                 ni++;
1638         }
1639
1640         /*
1641          * finally correct the size of the cursors array
1642          */
1643         nuv.ctr.ctr2.count = ni;
1644
1645         /*
1646          * sort the cursors
1647          */
1648         qsort(nuv.ctr.ctr2.cursors, nuv.ctr.ctr2.count,
1649               sizeof(struct drsuapi_DsReplicaCursor2),
1650               (comparison_fn_t)drsuapi_DsReplicaCursor2_compare);
1651
1652         /*
1653          * create the change ldb_message
1654          */
1655         msg = ldb_msg_new(ar);
1656         if (!msg) return replmd_replicated_request_werror(ar, WERR_NOMEM);
1657         msg->dn = ar->search_msg->dn;
1658
1659         ndr_err = ndr_push_struct_blob(&nuv_value, msg,
1660                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
1661                                        &nuv,
1662                                        (ndr_push_flags_fn_t)ndr_push_replUpToDateVectorBlob);
1663         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1664                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
1665                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
1666         }
1667         ret = ldb_msg_add_value(msg, "replUpToDateVector", &nuv_value, &nuv_el);
1668         if (ret != LDB_SUCCESS) {
1669                 return replmd_replicated_request_error(ar, ret);
1670         }
1671         nuv_el->flags = LDB_FLAG_MOD_REPLACE;
1672
1673         /*
1674          * now create the new repsFrom value from the given repsFromTo1 structure
1675          */
1676         ZERO_STRUCT(nrf);
1677         nrf.version                                     = 1;
1678         nrf.ctr.ctr1                                    = *ar->objs->source_dsa;
1679         /* and fix some values... */
1680         nrf.ctr.ctr1.consecutive_sync_failures          = 0;
1681         nrf.ctr.ctr1.last_success                       = now;
1682         nrf.ctr.ctr1.last_attempt                       = now;
1683         nrf.ctr.ctr1.result_last_attempt                = WERR_OK;
1684         nrf.ctr.ctr1.highwatermark.highest_usn          = nrf.ctr.ctr1.highwatermark.tmp_highest_usn;
1685
1686         /*
1687          * first see if we already have a repsFrom value for the current source dsa
1688          * if so we'll later replace this value
1689          */
1690         orf_el = ldb_msg_find_element(ar->search_msg, "repsFrom");
1691         if (orf_el) {
1692                 for (i=0; i < orf_el->num_values; i++) {
1693                         struct repsFromToBlob *trf;
1694
1695                         trf = talloc(ar, struct repsFromToBlob);
1696                         if (!trf) return replmd_replicated_request_werror(ar, WERR_NOMEM);
1697
1698                         ndr_err = ndr_pull_struct_blob(&orf_el->values[i], trf, lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")), trf,
1699                                                        (ndr_pull_flags_fn_t)ndr_pull_repsFromToBlob);
1700                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1701                                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
1702                                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
1703                         }
1704
1705                         if (trf->version != 1) {
1706                                 return replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
1707                         }
1708
1709                         /*
1710                          * we compare the source dsa objectGUID not the invocation_id
1711                          * because we want only one repsFrom value per source dsa
1712                          * and when the invocation_id of the source dsa has changed we don't need
1713                          * the old repsFrom with the old invocation_id
1714                          */
1715                         if (!GUID_equal(&trf->ctr.ctr1.source_dsa_obj_guid,
1716                                         &ar->objs->source_dsa->source_dsa_obj_guid)) {
1717                                 talloc_free(trf);
1718                                 continue;
1719                         }
1720
1721                         talloc_free(trf);
1722                         nrf_value = &orf_el->values[i];
1723                         break;
1724                 }
1725
1726                 /*
1727                  * copy over all old values to the new ldb_message
1728                  */
1729                 ret = ldb_msg_add_empty(msg, "repsFrom", 0, &nrf_el);
1730                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
1731                 *nrf_el = *orf_el;
1732         }
1733
1734         /*
1735          * if we haven't found an old repsFrom value for the current source dsa
1736          * we'll add a new value
1737          */
1738         if (!nrf_value) {
1739                 struct ldb_val zero_value;
1740                 ZERO_STRUCT(zero_value);
1741                 ret = ldb_msg_add_value(msg, "repsFrom", &zero_value, &nrf_el);
1742                 if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
1743
1744                 nrf_value = &nrf_el->values[nrf_el->num_values - 1];
1745         }
1746
1747         /* we now fill the value which is already attached to ldb_message */
1748         ndr_err = ndr_push_struct_blob(nrf_value, msg,
1749                                        lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm")),
1750                                        &nrf,
1751                                        (ndr_push_flags_fn_t)ndr_push_repsFromToBlob);
1752         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1753                 NTSTATUS nt_status = ndr_map_error2ntstatus(ndr_err);
1754                 return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
1755         }
1756
1757         /*
1758          * the ldb_message_element for the attribute, has all the old values and the new one
1759          * so we'll replace the whole attribute with all values
1760          */
1761         nrf_el->flags = LDB_FLAG_MOD_REPLACE;
1762
1763         if (DEBUGLVL(4)) {
1764                 char *s = ldb_ldif_message_string(ldb, ar, LDB_CHANGETYPE_MODIFY, msg);
1765                 DEBUG(4, ("DRS replication uptodate modify message:\n%s\n", s));
1766                 talloc_free(s);
1767         }
1768
1769         /* prepare the ldb_modify() request */
1770         ret = ldb_build_mod_req(&change_req,
1771                                 ldb,
1772                                 ar,
1773                                 msg,
1774                                 ar->controls,
1775                                 ar,
1776                                 replmd_replicated_uptodate_modify_callback,
1777                                 ar->req);
1778         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
1779
1780         return ldb_next_request(ar->module, change_req);
1781 }
1782
1783 static int replmd_replicated_uptodate_search_callback(struct ldb_request *req,
1784                                                       struct ldb_reply *ares)
1785 {
1786         struct replmd_replicated_request *ar = talloc_get_type(req->context,
1787                                                struct replmd_replicated_request);
1788         int ret;
1789
1790         if (!ares) {
1791                 return ldb_module_done(ar->req, NULL, NULL,
1792                                         LDB_ERR_OPERATIONS_ERROR);
1793         }
1794         if (ares->error != LDB_SUCCESS &&
1795             ares->error != LDB_ERR_NO_SUCH_OBJECT) {
1796                 return ldb_module_done(ar->req, ares->controls,
1797                                         ares->response, ares->error);
1798         }
1799
1800         switch (ares->type) {
1801         case LDB_REPLY_ENTRY:
1802                 ar->search_msg = talloc_steal(ar, ares->message);
1803                 break;
1804
1805         case LDB_REPLY_REFERRAL:
1806                 /* we ignore referrals */
1807                 break;
1808
1809         case LDB_REPLY_DONE:
1810                 if (ar->search_msg == NULL) {
1811                         ret = replmd_replicated_request_werror(ar, WERR_DS_DRA_INTERNAL_ERROR);
1812                 } else {
1813                         ret = replmd_replicated_uptodate_modify(ar);
1814                 }
1815                 if (ret != LDB_SUCCESS) {
1816                         return ldb_module_done(ar->req, NULL, NULL, ret);
1817                 }
1818         }
1819
1820         talloc_free(ares);
1821         return LDB_SUCCESS;
1822 }
1823
1824
1825 static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *ar)
1826 {
1827         struct ldb_context *ldb;
1828         int ret;
1829         static const char *attrs[] = {
1830                 "replUpToDateVector",
1831                 "repsFrom",
1832                 NULL
1833         };
1834         struct ldb_request *search_req;
1835
1836         ldb = ldb_module_get_ctx(ar->module);
1837         ar->search_msg = NULL;
1838
1839         ret = ldb_build_search_req(&search_req,
1840                                    ldb,
1841                                    ar,
1842                                    ar->objs->partition_dn,
1843                                    LDB_SCOPE_BASE,
1844                                    "(objectClass=*)",
1845                                    attrs,
1846                                    NULL,
1847                                    ar,
1848                                    replmd_replicated_uptodate_search_callback,
1849                                    ar->req);
1850         if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
1851
1852         return ldb_next_request(ar->module, search_req);
1853 }
1854
1855
1856
1857 static int replmd_extended_replicated_objects(struct ldb_module *module, struct ldb_request *req)
1858 {
1859         struct ldb_context *ldb;
1860         struct dsdb_extended_replicated_objects *objs;
1861         struct replmd_replicated_request *ar;
1862         struct ldb_control **ctrls;
1863         int ret, i;
1864         struct replmd_private *replmd_private =
1865                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
1866
1867         ldb = ldb_module_get_ctx(module);
1868
1869         ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_extended_replicated_objects\n");
1870
1871         objs = talloc_get_type(req->op.extended.data, struct dsdb_extended_replicated_objects);
1872         if (!objs) {
1873                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: invalid extended data\n");
1874                 return LDB_ERR_PROTOCOL_ERROR;
1875         }
1876
1877         if (objs->version != DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION) {
1878                 ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_extended_replicated_objects: extended data invalid version [%u != %u]\n",
1879                           objs->version, DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION);
1880                 return LDB_ERR_PROTOCOL_ERROR;
1881         }
1882
1883         ar = replmd_ctx_init(module, req);
1884         if (!ar)
1885                 return LDB_ERR_OPERATIONS_ERROR;
1886
1887         /* Set the flags to have the replmd_op_callback run over the full set of objects */
1888         ar->apply_mode = true;
1889         ar->objs = objs;
1890         ar->schema = dsdb_get_schema(ldb);
1891         if (!ar->schema) {
1892                 ldb_debug_set(ldb, LDB_DEBUG_FATAL, "replmd_ctx_init: no loaded schema found\n");
1893                 talloc_free(ar);
1894                 DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb)));
1895                 return LDB_ERR_CONSTRAINT_VIOLATION;
1896         }
1897
1898         ctrls = req->controls;
1899
1900         if (req->controls) {
1901                 req->controls = talloc_memdup(ar, req->controls,
1902                                               talloc_get_size(req->controls));
1903                 if (!req->controls) return replmd_replicated_request_werror(ar, WERR_NOMEM);
1904         }
1905
1906         ret = ldb_request_add_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID, false, NULL);
1907         if (ret != LDB_SUCCESS) {
1908                 return ret;
1909         }
1910
1911         ar->controls = req->controls;
1912         req->controls = ctrls;
1913
1914         DEBUG(4,("linked_attributes_count=%u\n", objs->linked_attributes_count));
1915
1916         /* save away the linked attributes for the end of the
1917            transaction */
1918         for (i=0; i<ar->objs->linked_attributes_count; i++) {
1919                 struct la_entry *la_entry;
1920
1921                 if (replmd_private->la_ctx == NULL) {
1922                         replmd_private->la_ctx = talloc_new(replmd_private);
1923                 }
1924                 la_entry = talloc(replmd_private->la_ctx, struct la_entry);
1925                 if (la_entry == NULL) {
1926                         ldb_oom(ldb);
1927                         return LDB_ERR_OPERATIONS_ERROR;
1928                 }
1929                 la_entry->la = talloc(la_entry, struct drsuapi_DsReplicaLinkedAttribute);
1930                 if (la_entry->la == NULL) {
1931                         talloc_free(la_entry);
1932                         ldb_oom(ldb);
1933                         return LDB_ERR_OPERATIONS_ERROR;
1934                 }
1935                 *la_entry->la = ar->objs->linked_attributes[i];
1936
1937                 /* we need to steal the non-scalars so they stay
1938                    around until the end of the transaction */
1939                 talloc_steal(la_entry->la, la_entry->la->identifier);
1940                 talloc_steal(la_entry->la, la_entry->la->value.blob);
1941
1942                 DLIST_ADD(replmd_private->la_list, la_entry);
1943         }
1944
1945         return replmd_replicated_apply_next(ar);
1946 }
1947
1948 /*
1949   process one linked attribute structure
1950  */
1951 static int replmd_process_linked_attribute(struct ldb_module *module,
1952                                            struct la_entry *la_entry)
1953 {
1954         struct drsuapi_DsReplicaLinkedAttribute *la = la_entry->la;
1955         struct ldb_context *ldb = ldb_module_get_ctx(module);
1956         struct dsdb_schema *schema = dsdb_get_schema(ldb);
1957         struct drsuapi_DsReplicaObjectIdentifier3 target;
1958         struct ldb_message *msg;
1959         TALLOC_CTX *tmp_ctx = talloc_new(la_entry);
1960         struct ldb_request *mod_req;
1961         int ret;
1962         const struct dsdb_attribute *attr;
1963         struct ldb_dn *target_dn;
1964         struct dsdb_dn *dsdb_dn;
1965         uint64_t seq_num = 0;
1966         struct drsuapi_DsReplicaAttribute drs;
1967         struct drsuapi_DsAttributeValue val;
1968         struct ldb_message_element el;
1969         const struct ldb_val *guid;
1970         WERROR status;
1971
1972         drs.value_ctr.num_values = 1;
1973         drs.value_ctr.values = &val;
1974         val.blob = la->value.blob;
1975
1976 /*
1977 linked_attributes[0]:
1978      &objs->linked_attributes[i]: struct drsuapi_DsReplicaLinkedAttribute
1979         identifier               : *
1980             identifier: struct drsuapi_DsReplicaObjectIdentifier
1981                 __ndr_size               : 0x0000003a (58)
1982                 __ndr_size_sid           : 0x00000000 (0)
1983                 guid                     : 8e95b6a9-13dd-4158-89db-3220a5be5cc7
1984                 sid                      : S-0-0
1985                 __ndr_size_dn            : 0x00000000 (0)
1986                 dn                       : ''
1987         attid                    : DRSUAPI_ATTRIBUTE_member (0x1F)
1988         value: struct drsuapi_DsAttributeValue
1989             __ndr_size               : 0x0000007e (126)
1990             blob                     : *
1991                 blob                     : DATA_BLOB length=126
1992         flags                    : 0x00000001 (1)
1993                1: DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE
1994         originating_add_time     : Wed Sep  2 22:20:01 2009 EST
1995         meta_data: struct drsuapi_DsReplicaMetaData
1996             version                  : 0x00000015 (21)
1997             originating_change_time  : Wed Sep  2 23:39:07 2009 EST
1998             originating_invocation_id: 794640f3-18cf-40ee-a211-a93992b67a64
1999             originating_usn          : 0x000000000001e19c (123292)
2000
2001 (for cases where the link is to a normal DN)
2002      &target: struct drsuapi_DsReplicaObjectIdentifier3
2003         __ndr_size               : 0x0000007e (126)
2004         __ndr_size_sid           : 0x0000001c (28)
2005         guid                     : 7639e594-db75-4086-b0d4-67890ae46031
2006         sid                      : S-1-5-21-2848215498-2472035911-1947525656-19924
2007         __ndr_size_dn            : 0x00000022 (34)
2008         dn                       : 'CN=UOne,OU=TestOU,DC=vsofs8,DC=com'
2009  */
2010
2011         /* find the attribute being modified */
2012         attr = dsdb_attribute_by_attributeID_id(schema, la->attid);
2013         if (attr == NULL) {
2014                 DEBUG(0, (__location__ ": Unable to find attributeID 0x%x\n", la->attid));
2015                 talloc_free(tmp_ctx);
2016                 return LDB_ERR_OPERATIONS_ERROR;
2017         }
2018
2019         status = attr->syntax->drsuapi_to_ldb(ldb, schema, attr, &drs, tmp_ctx, &el);
2020
2021         /* construct a modify request for this attribute change */
2022         msg = ldb_msg_new(tmp_ctx);
2023         if (!msg) {
2024                 ldb_oom(ldb);
2025                 talloc_free(tmp_ctx);
2026                 return LDB_ERR_OPERATIONS_ERROR;
2027         }
2028
2029         ret = dsdb_find_dn_by_guid(ldb, tmp_ctx,
2030                                    GUID_string(tmp_ctx, &la->identifier->guid), &msg->dn);
2031         if (ret != LDB_SUCCESS) {
2032                 talloc_free(tmp_ctx);
2033                 return ret;
2034         }
2035
2036         el.name = attr->lDAPDisplayName;
2037         if (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE) {
2038                 ret = ldb_msg_add(msg, &el, LDB_FLAG_MOD_ADD);
2039         } else {
2040                 ret = ldb_msg_add(msg, &el, LDB_FLAG_MOD_DELETE);
2041         }
2042         if (ret != LDB_SUCCESS) {
2043                 talloc_free(tmp_ctx);
2044                 return ret;
2045         }
2046
2047         dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &el.values[0], attr->syntax->ldap_oid);
2048         if (!dsdb_dn) {
2049                 DEBUG(0,(__location__ ": Failed to parse just-generated DN\n"));
2050                 talloc_free(tmp_ctx);
2051                 return LDB_ERR_INVALID_DN_SYNTAX;
2052         }
2053
2054         guid = ldb_dn_get_extended_component(dsdb_dn->dn, "GUID");
2055         if (!guid) {
2056                 DEBUG(0,(__location__ ": Failed to parse GUID from just-generated DN\n"));
2057                 talloc_free(tmp_ctx);
2058                 return LDB_ERR_INVALID_DN_SYNTAX;
2059         }
2060
2061         ret = dsdb_find_dn_by_guid(ldb, tmp_ctx, ldb_binary_encode(tmp_ctx, *guid), &target_dn);
2062         if (ret != LDB_SUCCESS) {
2063                 /* If this proves to be a problem in the future, then
2064                  * just remove the return - perhaps we can just use
2065                  * the details the replication peer supplied */
2066
2067                 DEBUG(0,(__location__ ": Failed to map GUID %s to DN\n", GUID_string(tmp_ctx, &target.guid)));
2068                 talloc_free(tmp_ctx);
2069                 return LDB_ERR_OPERATIONS_ERROR;
2070         } else {
2071
2072                 /* Now update with full DN we just found in the DB (including extended components) */
2073                 dsdb_dn->dn = target_dn;
2074                 /* Now make a linearized version, using the original binary components (if any) */
2075                 el.values[0] = data_blob_string_const(dsdb_dn_get_extended_linearized(tmp_ctx, dsdb_dn, 1));
2076         }
2077
2078         ret = replmd_update_rpmd(module, schema, msg, &seq_num);
2079         if (ret != LDB_SUCCESS) {
2080                 talloc_free(tmp_ctx);
2081                 return ret;
2082         }
2083
2084         /* we only change whenChanged and uSNChanged if the seq_num
2085            has changed */
2086         if (seq_num != 0) {
2087                 time_t t = time(NULL);
2088
2089                 if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
2090                         talloc_free(tmp_ctx);
2091                         return LDB_ERR_OPERATIONS_ERROR;
2092                 }
2093
2094                 if (add_uint64_element(msg, "uSNChanged", seq_num) != LDB_SUCCESS) {
2095                         talloc_free(tmp_ctx);
2096                         return LDB_ERR_OPERATIONS_ERROR;
2097                 }
2098         }
2099
2100         ret = ldb_build_mod_req(&mod_req, ldb, tmp_ctx,
2101                                 msg,
2102                                 NULL,
2103                                 NULL,
2104                                 ldb_op_default_callback,
2105                                 NULL);
2106         if (ret != LDB_SUCCESS) {
2107                 talloc_free(tmp_ctx);
2108                 return ret;
2109         }
2110         talloc_steal(mod_req, msg);
2111
2112         if (DEBUGLVL(4)) {
2113                 DEBUG(4,("Applying DRS linked attribute change:\n%s\n",
2114                          ldb_ldif_message_string(ldb, tmp_ctx, LDB_CHANGETYPE_MODIFY, msg)));
2115         }
2116
2117         /* Run the new request */
2118         ret = ldb_next_request(module, mod_req);
2119
2120         /* we need to wait for this to finish, as we are being called
2121            from the synchronous end_transaction hook of this module */
2122         if (ret == LDB_SUCCESS) {
2123                 ret = ldb_wait(mod_req->handle, LDB_WAIT_ALL);
2124         }
2125
2126         if (ret == LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS) {
2127                 /* the link destination exists, we need to update it
2128                  * by deleting the old one for the same DN then adding
2129                  * the new one */
2130                 msg->elements = talloc_realloc(msg, msg->elements,
2131                                                struct ldb_message_element,
2132                                                msg->num_elements+1);
2133                 if (msg->elements == NULL) {
2134                         ldb_oom(ldb);
2135                         talloc_free(tmp_ctx);
2136                         return LDB_ERR_OPERATIONS_ERROR;
2137                 }
2138                 /* this relies on the backend matching the old entry
2139                    only by the DN portion of the extended DN */
2140                 msg->elements[1] = msg->elements[0];
2141                 msg->elements[0].flags = LDB_FLAG_MOD_DELETE;
2142                 msg->num_elements++;
2143
2144                 ret = ldb_build_mod_req(&mod_req, ldb, tmp_ctx,
2145                                         msg,
2146                                         NULL,
2147                                         NULL,
2148                                         ldb_op_default_callback,
2149                                         NULL);
2150                 if (ret != LDB_SUCCESS) {
2151                         talloc_free(tmp_ctx);
2152                         return ret;
2153                 }
2154
2155                 /* Run the new request */
2156                 ret = ldb_next_request(module, mod_req);
2157
2158                 if (ret == LDB_SUCCESS) {
2159                         ret = ldb_wait(mod_req->handle, LDB_WAIT_ALL);
2160                 }
2161         }
2162
2163         if (ret != LDB_SUCCESS) {
2164                 ldb_debug(ldb, LDB_DEBUG_WARNING, "Failed to apply linked attribute change '%s' %s\n",
2165                           ldb_errstring(ldb),
2166                           ldb_ldif_message_string(ldb, tmp_ctx, LDB_CHANGETYPE_MODIFY, msg));
2167                 ret = LDB_SUCCESS;
2168         }
2169
2170         talloc_free(tmp_ctx);
2171
2172         return ret;
2173 }
2174
2175 static int replmd_extended(struct ldb_module *module, struct ldb_request *req)
2176 {
2177         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_REPLICATED_OBJECTS_OID) == 0) {
2178                 return replmd_extended_replicated_objects(module, req);
2179         }
2180
2181         return ldb_next_request(module, req);
2182 }
2183
2184
2185 /*
2186   we hook into the transaction operations to allow us to
2187   perform the linked attribute updates at the end of the whole
2188   transaction. This allows a forward linked attribute to be created
2189   before the object is created. During a vampire, w2k8 sends us linked
2190   attributes before the objects they are part of.
2191  */
2192 static int replmd_start_transaction(struct ldb_module *module)
2193 {
2194         /* create our private structure for this transaction */
2195         struct replmd_private *replmd_private = talloc_get_type(ldb_module_get_private(module),
2196                                                                 struct replmd_private);
2197         talloc_free(replmd_private->la_ctx);
2198         replmd_private->la_list = NULL;
2199         replmd_private->la_ctx = NULL;
2200
2201         /* free any leftover mod_usn records from cancelled
2202            transactions */
2203         while (replmd_private->ncs) {
2204                 struct nc_entry *e = replmd_private->ncs;
2205                 DLIST_REMOVE(replmd_private->ncs, e);
2206                 talloc_free(e);
2207         }
2208
2209         return ldb_next_start_trans(module);
2210 }
2211
2212 /*
2213   on prepare commit we loop over our queued la_context structures and
2214   apply each of them
2215  */
2216 static int replmd_prepare_commit(struct ldb_module *module)
2217 {
2218         struct replmd_private *replmd_private =
2219                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
2220         struct la_entry *la, *prev;
2221         int ret;
2222
2223         /* walk the list backwards, to do the first entry first, as we
2224          * added the entries with DLIST_ADD() which puts them at the
2225          * start of the list */
2226         for (la = replmd_private->la_list; la && la->next; la=la->next) ;
2227
2228         for (; la; la=prev) {
2229                 prev = la->prev;
2230                 DLIST_REMOVE(replmd_private->la_list, la);
2231                 ret = replmd_process_linked_attribute(module, la);
2232                 if (ret != LDB_SUCCESS) {
2233                         talloc_free(replmd_private->la_ctx);
2234                         replmd_private->la_list = NULL;
2235                         replmd_private->la_ctx = NULL;
2236                         return ret;
2237                 }
2238         }
2239
2240         talloc_free(replmd_private->la_ctx);
2241         replmd_private->la_list = NULL;
2242         replmd_private->la_ctx = NULL;
2243
2244         /* possibly change @REPLCHANGED */
2245         ret = replmd_notify_store(module);
2246         if (ret != LDB_SUCCESS) {
2247                 return ret;
2248         }
2249
2250         return ldb_next_prepare_commit(module);
2251 }
2252
2253 static int replmd_del_transaction(struct ldb_module *module)
2254 {
2255         struct replmd_private *replmd_private =
2256                 talloc_get_type(ldb_module_get_private(module), struct replmd_private);
2257         talloc_free(replmd_private->la_ctx);
2258         replmd_private->la_list = NULL;
2259         replmd_private->la_ctx = NULL;
2260         return ldb_next_del_trans(module);
2261 }
2262
2263
2264 _PUBLIC_ const struct ldb_module_ops ldb_repl_meta_data_module_ops = {
2265         .name          = "repl_meta_data",
2266         .init_context      = replmd_init,
2267         .add               = replmd_add,
2268         .modify            = replmd_modify,
2269         .rename            = replmd_rename,
2270         .extended          = replmd_extended,
2271         .start_transaction = replmd_start_transaction,
2272         .prepare_commit    = replmd_prepare_commit,
2273         .del_transaction   = replmd_del_transaction,
2274 };