source4/dsdb/samdb/ldb_modules/partition.c

   1 /*
   2    Partitions ldb module
   3
   4    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2006
   5    Copyright (C) Stefan Metzmacher <metze@samba.org> 2007
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 /*
  22  *  Name: ldb
  23  *
  24  *  Component: ldb partitions module
  25  *
  26  *  Description: Implement LDAP partitions
  27  *
  28  *  Author: Andrew Bartlett
  29  *  Author: Stefan Metzmacher
  30  */
  31
  32 #include "dsdb/samdb/ldb_modules/partition.h"
  33
  34 struct part_request {
  35         struct ldb_module *module;
  36         struct ldb_request *req;
  37 };
  38
  39 struct partition_context {
  40         struct ldb_module *module;
  41         struct ldb_request *req;
  42
  43         struct part_request *part_req;
  44         unsigned int num_requests;
  45         unsigned int finished_requests;
  46
  47         const char **referrals;
  48 };
  49
  50 static struct partition_context *partition_init_ctx(struct ldb_module *module, struct ldb_request *req)
  51 {
  52         struct partition_context *ac;
  53
  54         ac = talloc_zero(req, struct partition_context);
  55         if (ac == NULL) {
  56                 ldb_set_errstring(ldb_module_get_ctx(module), "Out of Memory");
  57                 return NULL;
  58         }
  59
  60         ac->module = module;
  61         ac->req = req;
  62
  63         return ac;
  64 }
  65
  66 /*
  67  * helper functions to call the next module in chain
  68  */
  69 int partition_request(struct ldb_module *module, struct ldb_request *request)
  70 {
  71         if ((module && module->ldb->flags & LDB_FLG_ENABLE_TRACING)) { \
  72                 const struct dsdb_control_current_partition *partition = NULL;
  73                 struct ldb_control *partition_ctrl = ldb_request_get_control(request, DSDB_CONTROL_CURRENT_PARTITION_OID);
  74                 if (partition_ctrl) {
  75                         partition = talloc_get_type(partition_ctrl->data,
  76                                                     struct dsdb_control_current_partition);
  77                 }
  78
  79                 if (partition != NULL) {
  80                         ldb_debug(module->ldb, LDB_DEBUG_TRACE, "partition_request() -> %s",
  81                                   ldb_dn_get_linearized(partition->dn));
  82                 } else {
  83                         ldb_debug(module->ldb, LDB_DEBUG_TRACE, "partition_request() -> (metadata partition)");
  84                 }
  85         }
  86
  87         return ldb_next_request(module, request);
  88 }
  89
  90 static struct dsdb_partition *find_partition(struct partition_private_data *data,
  91                                              struct ldb_dn *dn,
  92                                              struct ldb_request *req)
  93 {
  94         unsigned int i;
  95         struct ldb_control *partition_ctrl;
  96
  97         /* see if the request has the partition DN specified in a
  98          * control. The repl_meta_data module can specify this to
  99          * ensure that replication happens to the right partition
 100          */
 101         partition_ctrl = ldb_request_get_control(req, DSDB_CONTROL_CURRENT_PARTITION_OID);
 102         if (partition_ctrl) {
 103                 const struct dsdb_control_current_partition *partition;
 104                 partition = talloc_get_type(partition_ctrl->data,
 105                                             struct dsdb_control_current_partition);
 106                 if (partition != NULL) {
 107                         dn = partition->dn;
 108                 }
 109         }
 110
 111         if (dn == NULL) {
 112                 return NULL;
 113         }
 114
 115         /* Look at base DN */
 116         /* Figure out which partition it is under */
 117         /* Skip the lot if 'data' isn't here yet (initialisation) */
 118         for (i=0; data && data->partitions && data->partitions[i]; i++) {
 119                 if (ldb_dn_compare_base(data->partitions[i]->ctrl->dn, dn) == 0) {
 120                         return data->partitions[i];
 121                 }
 122         }
 123
 124         return NULL;
 125 }
 126
 127 /**
 128  * fire the caller's callback for every entry, but only send 'done' once.
 129  */
 130 static int partition_req_callback(struct ldb_request *req,
 131                                   struct ldb_reply *ares)
 132 {
 133         struct partition_context *ac;
 134         struct ldb_module *module;
 135         struct ldb_request *nreq;
 136         int ret;
 137         struct partition_private_data *data;
 138         struct ldb_control *partition_ctrl;
 139
 140         ac = talloc_get_type(req->context, struct partition_context);
 141         data = talloc_get_type(ac->module->private_data, struct partition_private_data);
 142
 143         if (!ares) {
 144                 return ldb_module_done(ac->req, NULL, NULL,
 145                                         LDB_ERR_OPERATIONS_ERROR);
 146         }
 147
 148         partition_ctrl = ldb_request_get_control(req, DSDB_CONTROL_CURRENT_PARTITION_OID);
 149         if (partition_ctrl && (ac->num_requests == 1 || ares->type == LDB_REPLY_ENTRY)) {
 150                 /* If we didn't fan this request out to mulitple partitions,
 151                  * or this is an individual search result, we can
 152                  * deterministily tell the caller what partition this was
 153                  * written to (repl_meta_data likes to know) */
 154                 ret = ldb_reply_add_control(ares,
 155                                             DSDB_CONTROL_CURRENT_PARTITION_OID,
 156                                             false, partition_ctrl->data);
 157                 if (ret != LDB_SUCCESS) {
 158                         return ldb_module_done(ac->req, NULL, NULL,
 159                                                ret);
 160                 }
 161         }
 162
 163         if (ares->error != LDB_SUCCESS) {
 164                 return ldb_module_done(ac->req, ares->controls,
 165                                         ares->response, ares->error);
 166         }
 167
 168         switch (ares->type) {
 169         case LDB_REPLY_REFERRAL:
 170                 return ldb_module_send_referral(ac->req, ares->referral);
 171
 172         case LDB_REPLY_ENTRY:
 173                 if (ac->req->operation != LDB_SEARCH) {
 174                         ldb_set_errstring(ldb_module_get_ctx(ac->module),
 175                                 "partition_req_callback:"
 176                                 " Unsupported reply type for this request");
 177                         return ldb_module_done(ac->req, NULL, NULL,
 178                                                 LDB_ERR_OPERATIONS_ERROR);
 179                 }
 180
 181                 return ldb_module_send_entry(ac->req, ares->message, ares->controls);
 182
 183         case LDB_REPLY_DONE:
 184                 if (ac->req->operation == LDB_EXTENDED) {
 185                         /* FIXME: check for ares->response, replmd does not fill it ! */
 186                         if (ares->response) {
 187                                 if (strcmp(ares->response->oid, LDB_EXTENDED_START_TLS_OID) != 0) {
 188                                         ldb_set_errstring(ldb_module_get_ctx(ac->module),
 189                                                           "partition_req_callback:"
 190                                                           " Unknown extended reply, "
 191                                                           "only supports START_TLS");
 192                                         talloc_free(ares);
 193                                         return ldb_module_done(ac->req, NULL, NULL,
 194                                                                 LDB_ERR_OPERATIONS_ERROR);
 195                                 }
 196                         }
 197                 }
 198
 199                 ac->finished_requests++;
 200                 if (ac->finished_requests == ac->num_requests) {
 201                         /* Send back referrals if they do exist (search ops) */
 202                         if (ac->referrals != NULL) {
 203                                 const char **ref;
 204                                 for (ref = ac->referrals; *ref != NULL; ++ref) {
 205                                         ret = ldb_module_send_referral(ac->req,
 206                                                                        talloc_strdup(ac->req, *ref));
 207                                         if (ret != LDB_SUCCESS) {
 208                                                 return ldb_module_done(ac->req, NULL, NULL,
 209                                                                        ret);
 210                                         }
 211                                 }
 212                         }
 213
 214                         /* this was the last one, call callback */
 215                         return ldb_module_done(ac->req, ares->controls,
 216                                                ares->response,
 217                                                ares->error);
 218                 }
 219
 220                 /* not the last, now call the next one */
 221                 module = ac->part_req[ac->finished_requests].module;
 222                 nreq = ac->part_req[ac->finished_requests].req;
 223
 224                 ret = partition_request(module, nreq);
 225                 if (ret != LDB_SUCCESS) {
 226                         talloc_free(ares);
 227                         return ldb_module_done(ac->req, NULL, NULL, ret);
 228                 }
 229
 230                 break;
 231         }
 232
 233         talloc_free(ares);
 234         return LDB_SUCCESS;
 235 }
 236
 237 static int partition_prep_request(struct partition_context *ac,
 238                                   struct dsdb_partition *partition)
 239 {
 240         int ret;
 241         struct ldb_request *req;
 242
 243         ac->part_req = talloc_realloc(ac, ac->part_req,
 244                                         struct part_request,
 245                                         ac->num_requests + 1);
 246         if (ac->part_req == NULL) {
 247                 ldb_oom(ldb_module_get_ctx(ac->module));
 248                 return LDB_ERR_OPERATIONS_ERROR;
 249         }
 250
 251         switch (ac->req->operation) {
 252         case LDB_SEARCH:
 253                 ret = ldb_build_search_req_ex(&req, ldb_module_get_ctx(ac->module),
 254                                         ac->part_req,
 255                                         ac->req->op.search.base,
 256                                         ac->req->op.search.scope,
 257                                         ac->req->op.search.tree,
 258                                         ac->req->op.search.attrs,
 259                                         ac->req->controls,
 260                                         ac, partition_req_callback,
 261                                         ac->req);
 262                 break;
 263         case LDB_ADD:
 264                 ret = ldb_build_add_req(&req, ldb_module_get_ctx(ac->module), ac->part_req,
 265                                         ac->req->op.add.message,
 266                                         ac->req->controls,
 267                                         ac, partition_req_callback,
 268                                         ac->req);
 269                 break;
 270         case LDB_MODIFY:
 271                 ret = ldb_build_mod_req(&req, ldb_module_get_ctx(ac->module), ac->part_req,
 272                                         ac->req->op.mod.message,
 273                                         ac->req->controls,
 274                                         ac, partition_req_callback,
 275                                         ac->req);
 276                 break;
 277         case LDB_DELETE:
 278                 ret = ldb_build_del_req(&req, ldb_module_get_ctx(ac->module), ac->part_req,
 279                                         ac->req->op.del.dn,
 280                                         ac->req->controls,
 281                                         ac, partition_req_callback,
 282                                         ac->req);
 283                 break;
 284         case LDB_RENAME:
 285                 ret = ldb_build_rename_req(&req, ldb_module_get_ctx(ac->module), ac->part_req,
 286                                         ac->req->op.rename.olddn,
 287                                         ac->req->op.rename.newdn,
 288                                         ac->req->controls,
 289                                         ac, partition_req_callback,
 290                                         ac->req);
 291                 break;
 292         case LDB_EXTENDED:
 293                 ret = ldb_build_extended_req(&req, ldb_module_get_ctx(ac->module),
 294                                         ac->part_req,
 295                                         ac->req->op.extended.oid,
 296                                         ac->req->op.extended.data,
 297                                         ac->req->controls,
 298                                         ac, partition_req_callback,
 299                                         ac->req);
 300                 break;
 301         default:
 302                 ldb_set_errstring(ldb_module_get_ctx(ac->module),
 303                                   "Unsupported request type!");
 304                 ret = LDB_ERR_UNWILLING_TO_PERFORM;
 305         }
 306
 307         if (ret != LDB_SUCCESS) {
 308                 return ret;
 309         }
 310
 311         ac->part_req[ac->num_requests].req = req;
 312
 313         if (ac->req->controls) {
 314                 req->controls = talloc_memdup(req, ac->req->controls,
 315                                         talloc_get_size(ac->req->controls));
 316                 if (req->controls == NULL) {
 317                         ldb_oom(ldb_module_get_ctx(ac->module));
 318                         return LDB_ERR_OPERATIONS_ERROR;
 319                 }
 320         }
 321
 322         if (partition) {
 323                 ac->part_req[ac->num_requests].module = partition->module;
 324
 325                 if (!ldb_request_get_control(req, DSDB_CONTROL_CURRENT_PARTITION_OID)) {
 326                         ret = ldb_request_add_control(req,
 327                                                       DSDB_CONTROL_CURRENT_PARTITION_OID,
 328                                                       false, partition->ctrl);
 329                         if (ret != LDB_SUCCESS) {
 330                                 return ret;
 331                         }
 332                 }
 333
 334                 if (req->operation == LDB_SEARCH) {
 335                         /* If the search is for 'more' than this partition,
 336                          * then change the basedn, so a remote LDAP server
 337                          * doesn't object */
 338                         if (ldb_dn_compare_base(partition->ctrl->dn,
 339                                                 req->op.search.base) != 0) {
 340                                 req->op.search.base = partition->ctrl->dn;
 341                         }
 342                 }
 343
 344         } else {
 345                 /* make sure you put the module here, or
 346                  * or ldb_next_request() will skip a module */
 347                 ac->part_req[ac->num_requests].module = ac->module;
 348         }
 349
 350         ac->num_requests++;
 351
 352         return LDB_SUCCESS;
 353 }
 354
 355 static int partition_call_first(struct partition_context *ac)
 356 {
 357         return partition_request(ac->part_req[0].module, ac->part_req[0].req);
 358 }
 359
 360 /**
 361  * Send a request down to all the partitions
 362  */
 363 static int partition_send_all(struct ldb_module *module,
 364                               struct partition_context *ac,
 365                               struct ldb_request *req)
 366 {
 367         unsigned int i;
 368         struct partition_private_data *data = talloc_get_type(module->private_data,
 369                                                               struct partition_private_data);
 370         int ret = partition_prep_request(ac, NULL);
 371         if (ret != LDB_SUCCESS) {
 372                 return ret;
 373         }
 374         for (i=0; data && data->partitions && data->partitions[i]; i++) {
 375                 ret = partition_prep_request(ac, data->partitions[i]);
 376                 if (ret != LDB_SUCCESS) {
 377                         return ret;
 378                 }
 379         }
 380
 381         /* fire the first one */
 382         return partition_call_first(ac);
 383 }
 384
 385 /**
 386  * Figure out which backend a request needs to be aimed at.  Some
 387  * requests must be replicated to all backends
 388  */
 389 static int partition_replicate(struct ldb_module *module, struct ldb_request *req, struct ldb_dn *dn)
 390 {
 391         struct partition_context *ac;
 392         unsigned int i;
 393         int ret;
 394         struct dsdb_partition *partition;
 395         struct partition_private_data *data = talloc_get_type(module->private_data,
 396                                                               struct partition_private_data);
 397         if (!data || !data->partitions) {
 398                 return ldb_next_request(module, req);
 399         }
 400
 401         if (req->operation != LDB_SEARCH && ldb_dn_is_special(dn)) {
 402                 /* Is this a special DN, we need to replicate to every backend? */
 403                 for (i=0; data->replicate && data->replicate[i]; i++) {
 404                         if (ldb_dn_compare(data->replicate[i],
 405                                            dn) == 0) {
 406
 407                                 ac = partition_init_ctx(module, req);
 408                                 if (!ac) {
 409                                         return LDB_ERR_OPERATIONS_ERROR;
 410                                 }
 411
 412                                 return partition_send_all(module, ac, req);
 413                         }
 414                 }
 415         }
 416
 417         /* Otherwise, we need to find the partition to fire it to */
 418
 419         /* Find partition */
 420         partition = find_partition(data, dn, req);
 421         if (!partition) {
 422                 /*
 423                  * if we haven't found a matching partition
 424                  * pass the request to the main ldb
 425                  *
 426                  * TODO: we should maybe return an error here
 427                  *       if it's not a special dn
 428                  */
 429
 430                 return ldb_next_request(module, req);
 431         }
 432
 433         ac = partition_init_ctx(module, req);
 434         if (!ac) {
 435                 return LDB_ERR_OPERATIONS_ERROR;
 436         }
 437
 438         /* we need to add a control but we never touch the original request */
 439         ret = partition_prep_request(ac, partition);
 440         if (ret != LDB_SUCCESS) {
 441                 return ret;
 442         }
 443
 444         /* fire the first one */
 445         return partition_call_first(ac);
 446 }
 447
 448 /* search */
 449 static int partition_search(struct ldb_module *module, struct ldb_request *req)
 450 {
 451         struct ldb_control **saved_controls;
 452         /* Find backend */
 453         struct partition_private_data *data = talloc_get_type(module->private_data,
 454                                                               struct partition_private_data);
 455         struct partition_context *ac;
 456         struct ldb_context *ldb;
 457         struct loadparm_context *lp_ctx;
 458
 459         struct ldb_control *search_control = ldb_request_get_control(req, LDB_CONTROL_SEARCH_OPTIONS_OID);
 460         struct ldb_control *domain_scope_control = ldb_request_get_control(req, LDB_CONTROL_DOMAIN_SCOPE_OID);
 461
 462         struct ldb_search_options_control *search_options = NULL;
 463         struct dsdb_partition *p;
 464         unsigned int i, j;
 465         int ret;
 466         bool domain_scope = false, phantom_root = false;
 467
 468         ret = partition_reload_if_required(module, data);
 469         if (ret != LDB_SUCCESS) {
 470                 return ret;
 471         }
 472
 473         if (!ldb_dn_is_special(req->op.search.base)) {
 474                 p = find_partition(data, NULL, req);
 475                 if (p != NULL) {
 476                         /* the caller specified what partition they want the
 477                         * search - just pass it on
 478                         */
 479                         return ldb_next_request(p->module, req);
 480                 }
 481         }
 482
 483         /* Get back the search options from the search control, and mark it as
 484          * non-critical (to make backends and also dcpromo happy).
 485          */
 486         if (search_control) {
 487                 search_options = talloc_get_type(search_control->data, struct ldb_search_options_control);
 488                 search_control->critical = 0;
 489
 490         }
 491
 492         /* Remove the "domain_scope" control, so we don't confuse a backend
 493          * server */
 494         if (domain_scope_control && !save_controls(domain_scope_control, req, &saved_controls)) {
 495                 ldb_oom(ldb_module_get_ctx(module));
 496                 return LDB_ERR_OPERATIONS_ERROR;
 497         }
 498
 499         /* Locate the options */
 500         domain_scope = (search_options
 501                 && (search_options->search_options & LDB_SEARCH_OPTION_DOMAIN_SCOPE))
 502                 || domain_scope_control;
 503         phantom_root = search_options
 504                 && (search_options->search_options & LDB_SEARCH_OPTION_PHANTOM_ROOT);
 505
 506         /* Remove handled options from the search control flag */
 507         if (search_options) {
 508                 search_options->search_options = search_options->search_options
 509                         & ~LDB_SEARCH_OPTION_DOMAIN_SCOPE
 510                         & ~LDB_SEARCH_OPTION_PHANTOM_ROOT;
 511         }
 512
 513         if (!data || !data->partitions) {
 514                 return ldb_next_request(module, req);
 515         }
 516
 517         ac = partition_init_ctx(module, req);
 518         if (!ac) {
 519                 return LDB_ERR_OPERATIONS_ERROR;
 520         }
 521
 522         ldb = ldb_module_get_ctx(ac->module);
 523         lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
 524                                                 struct loadparm_context);
 525
 526         /* Search from the base DN */
 527         if (ldb_dn_is_null(req->op.search.base)) {
 528                 return partition_send_all(module, ac, req);
 529         }
 530
 531         for (i=0; data->partitions[i]; i++) {
 532                 bool match = false, stop = false;
 533
 534                 if (phantom_root) {
 535                         /* Phantom root: Find all partitions under the
 536                          * search base. We match if:
 537                          *
 538                          * 1) the DN we are looking for exactly matches a
 539                          *    certain partition and always stop
 540                          * 2) the DN we are looking for is a parent of certain
 541                          *    partitions and it isn't a scope base search
 542                          * 3) the DN we are looking for is a child of a certain
 543                          *    partition and always stop
 544                          *    - we don't need to go any further up in the
 545                          *    hierarchy!
 546                          */
 547                         if (ldb_dn_compare(data->partitions[i]->ctrl->dn,
 548                                            req->op.search.base) == 0) {
 549                                 match = true;
 550                                 stop = true;
 551                         }
 552                         if (!match &&
 553                             (ldb_dn_compare_base(req->op.search.base,
 554                                                  data->partitions[i]->ctrl->dn) == 0 &&
 555                              req->op.search.scope != LDB_SCOPE_BASE)) {
 556                                 match = true;
 557                         }
 558                         if (!match &&
 559                             ldb_dn_compare_base(data->partitions[i]->ctrl->dn,
 560                                                 req->op.search.base) == 0) {
 561                                 match = true;
 562                                 stop = true; /* note that this relies on partition ordering */
 563                         }
 564                 } else {
 565                         /* Domain scope: Find all partitions under the search
 566                          * base.
 567                          *
 568                          * We generate referral candidates if we haven't
 569                          * specified the domain scope control, haven't a base
 570                          * search* scope and the DN we are looking for is a real
 571                          * predecessor of certain partitions. When a new
 572                          * referral candidate is nearer to the DN than an
 573                          * existing one delete the latter (we want to have only
 574                          * the closest ones). When we checked this for all
 575                          * candidates we have the final referrals.
 576                          *
 577                          * We match if the DN we are looking for is a child of
 578                          * a certain partition or the partition
 579                          * DN itself - we don't need to go any further
 580                          * up in the hierarchy!
 581                          */
 582                         if ((!domain_scope) &&
 583                             (req->op.search.scope != LDB_SCOPE_BASE) &&
 584                             (ldb_dn_compare_base(req->op.search.base,
 585                                                  data->partitions[i]->ctrl->dn) == 0) &&
 586                             (ldb_dn_compare(req->op.search.base,
 587                                             data->partitions[i]->ctrl->dn) != 0)) {
 588                                 char *ref = talloc_asprintf(ac,
 589                                                             "ldap://%s/%s%s",
 590                                                             lp_dnsdomain(lp_ctx),
 591                                                             ldb_dn_get_linearized(data->partitions[i]->ctrl->dn),
 592                                                             req->op.search.scope == LDB_SCOPE_ONELEVEL ? "??base" : "");
 593
 594                                 if (ref == NULL) {
 595                                         ldb_oom(ldb);
 596                                         return LDB_ERR_OPERATIONS_ERROR;
 597                                 }
 598
 599                                 /* Initialise the referrals list */
 600                                 if (ac->referrals == NULL) {
 601                                         ac->referrals = (const char **) str_list_make_empty(ac);
 602                                         if (ac->referrals == NULL) {
 603                                                 ldb_oom(ldb);
 604                                                 return LDB_ERR_OPERATIONS_ERROR;
 605                                         }
 606                                 }
 607
 608                                 /* Check if the new referral candidate is
 609                                  * closer to the base DN than already
 610                                  * saved ones and delete the latters */
 611                                 j = 0;
 612                                 while (ac->referrals[j] != NULL) {
 613                                         if (strstr(ac->referrals[j],
 614                                                    ldb_dn_get_linearized(data->partitions[i]->ctrl->dn)) != NULL) {
 615                                                 str_list_remove(ac->referrals,
 616                                                                 ac->referrals[j]);
 617                                         } else {
 618                                                 ++j;
 619                                         }
 620                                 }
 621
 622                                 /* Add our new candidate */
 623                                 ac->referrals = str_list_add(ac->referrals, ref);
 624
 625                                 talloc_free(ref);
 626
 627                                 if (ac->referrals == NULL) {
 628                                         ldb_oom(ldb);
 629                                         return LDB_ERR_OPERATIONS_ERROR;
 630                                 }
 631                         }
 632                         if (ldb_dn_compare_base(data->partitions[i]->ctrl->dn, req->op.search.base) == 0) {
 633                                 match = true;
 634                                 stop = true; /* note that this relies on partition ordering */
 635                         }
 636                 }
 637
 638                 if (match) {
 639                         ret = partition_prep_request(ac, data->partitions[i]);
 640                         if (ret != LDB_SUCCESS) {
 641                                 return ret;
 642                         }
 643                 }
 644
 645                 if (stop) break;
 646         }
 647
 648         /* Perhaps we didn't match any partitions. Try the main partition */
 649         if (ac->num_requests == 0) {
 650                 talloc_free(ac);
 651                 return ldb_next_request(module, req);
 652         }
 653
 654         /* fire the first one */
 655         return partition_call_first(ac);
 656 }
 657
 658 /* add */
 659 static int partition_add(struct ldb_module *module, struct ldb_request *req)
 660 {
 661         return partition_replicate(module, req, req->op.add.message->dn);
 662 }
 663
 664 /* modify */
 665 static int partition_modify(struct ldb_module *module, struct ldb_request *req)
 666 {
 667         return partition_replicate(module, req, req->op.mod.message->dn);
 668 }
 669
 670 /* delete */
 671 static int partition_delete(struct ldb_module *module, struct ldb_request *req)
 672 {
 673         return partition_replicate(module, req, req->op.del.dn);
 674 }
 675
 676 /* rename */
 677 static int partition_rename(struct ldb_module *module, struct ldb_request *req)
 678 {
 679         /* Find backend */
 680         struct dsdb_partition *backend, *backend2;
 681
 682         struct partition_private_data *data = talloc_get_type(module->private_data,
 683                                                               struct partition_private_data);
 684
 685         /* Skip the lot if 'data' isn't here yet (initialisation) */
 686         if (!data) {
 687                 return LDB_ERR_OPERATIONS_ERROR;
 688         }
 689
 690         backend = find_partition(data, req->op.rename.olddn, req);
 691         backend2 = find_partition(data, req->op.rename.newdn, req);
 692
 693         if ((backend && !backend2) || (!backend && backend2)) {
 694                 return LDB_ERR_AFFECTS_MULTIPLE_DSAS;
 695         }
 696
 697         if (backend != backend2) {
 698                 ldb_asprintf_errstring(ldb_module_get_ctx(module),
 699                                        "Cannot rename from %s in %s to %s in %s: %s",
 700                                        ldb_dn_get_linearized(req->op.rename.olddn),
 701                                        ldb_dn_get_linearized(backend->ctrl->dn),
 702                                        ldb_dn_get_linearized(req->op.rename.newdn),
 703                                        ldb_dn_get_linearized(backend2->ctrl->dn),
 704                                        ldb_strerror(LDB_ERR_AFFECTS_MULTIPLE_DSAS));
 705                 return LDB_ERR_AFFECTS_MULTIPLE_DSAS;
 706         }
 707
 708         return partition_replicate(module, req, req->op.rename.olddn);
 709 }
 710
 711 /* start a transaction */
 712 static int partition_start_trans(struct ldb_module *module)
 713 {
 714         unsigned int i;
 715         int ret;
 716         struct partition_private_data *data = talloc_get_type(module->private_data,
 717                                                               struct partition_private_data);
 718         /* Look at base DN */
 719         /* Figure out which partition it is under */
 720         /* Skip the lot if 'data' isn't here yet (initialization) */
 721         if ((module && module->ldb->flags & LDB_FLG_ENABLE_TRACING)) {
 722                 ldb_debug(module->ldb, LDB_DEBUG_TRACE, "partition_start_trans() -> (metadata partition)");
 723         }
 724         ret = ldb_next_start_trans(module);
 725         if (ret != LDB_SUCCESS) {
 726                 return ret;
 727         }
 728
 729         ret = partition_reload_if_required(module, data);
 730         if (ret != LDB_SUCCESS) {
 731                 return ret;
 732         }
 733
 734         for (i=0; data && data->partitions && data->partitions[i]; i++) {
 735                 if ((module && module->ldb->flags & LDB_FLG_ENABLE_TRACING)) {
 736                         ldb_debug(module->ldb, LDB_DEBUG_TRACE, "partition_start_trans() -> %s",
 737                                   ldb_dn_get_linearized(data->partitions[i]->ctrl->dn));
 738                 }
 739                 ret = ldb_next_start_trans(data->partitions[i]->module);
 740                 if (ret != LDB_SUCCESS) {
 741                         /* Back it out, if it fails on one */
 742                         for (i--; i >= 0; i--) {
 743                                 ldb_next_del_trans(data->partitions[i]->module);
 744                         }
 745                         ldb_next_del_trans(module);
 746                         return ret;
 747                 }
 748         }
 749
 750         data->in_transaction++;
 751
 752         return LDB_SUCCESS;
 753 }
 754
 755 /* prepare for a commit */
 756 static int partition_prepare_commit(struct ldb_module *module)
 757 {
 758         unsigned int i;
 759         struct partition_private_data *data = talloc_get_type(module->private_data,
 760                                                               struct partition_private_data);
 761
 762         for (i=0; data && data->partitions && data->partitions[i]; i++) {
 763                 int ret;
 764
 765                 if ((module && module->ldb->flags & LDB_FLG_ENABLE_TRACING)) {
 766                         ldb_debug(module->ldb, LDB_DEBUG_TRACE, "partition_prepare_commit() -> %s",
 767                                   ldb_dn_get_linearized(data->partitions[i]->ctrl->dn));
 768                 }
 769                 ret = ldb_next_prepare_commit(data->partitions[i]->module);
 770                 if (ret != LDB_SUCCESS) {
 771                         ldb_asprintf_errstring(module->ldb, "prepare_commit error on %s: %s",
 772                                                ldb_dn_get_linearized(data->partitions[i]->ctrl->dn),
 773                                                ldb_errstring(module->ldb));
 774                         return ret;
 775                 }
 776         }
 777
 778         if ((module && module->ldb->flags & LDB_FLG_ENABLE_TRACING)) {
 779                 ldb_debug(module->ldb, LDB_DEBUG_TRACE, "partition_prepare_commit() -> (metadata partition)");
 780         }
 781         return ldb_next_prepare_commit(module);
 782 }
 783
 784
 785 /* end a transaction */
 786 static int partition_end_trans(struct ldb_module *module)
 787 {
 788         int ret, ret2;
 789         unsigned int i;
 790         struct partition_private_data *data = talloc_get_type(module->private_data,
 791                                                               struct partition_private_data);
 792
 793         ret = LDB_SUCCESS;
 794
 795         if (data->in_transaction == 0) {
 796                 DEBUG(0,("partition end transaction mismatch\n"));
 797                 ret = LDB_ERR_OPERATIONS_ERROR;
 798         } else {
 799                 data->in_transaction--;
 800         }
 801
 802         for (i=0; data && data->partitions && data->partitions[i]; i++) {
 803                 if ((module && module->ldb->flags & LDB_FLG_ENABLE_TRACING)) {
 804                         ldb_debug(module->ldb, LDB_DEBUG_TRACE, "partition_end_trans() -> %s",
 805                                   ldb_dn_get_linearized(data->partitions[i]->ctrl->dn));
 806                 }
 807                 ret2 = ldb_next_end_trans(data->partitions[i]->module);
 808                 if (ret2 != LDB_SUCCESS) {
 809                         ldb_asprintf_errstring(module->ldb, "end_trans error on %s: %s",
 810                                                ldb_dn_get_linearized(data->partitions[i]->ctrl->dn),
 811                                                ldb_errstring(module->ldb));
 812                         ret = ret2;
 813                 }
 814         }
 815
 816         if ((module && module->ldb->flags & LDB_FLG_ENABLE_TRACING)) {
 817                 ldb_debug(module->ldb, LDB_DEBUG_TRACE, "partition_end_trans() -> (metadata partition)");
 818         }
 819         ret2 = ldb_next_end_trans(module);
 820         if (ret2 != LDB_SUCCESS) {
 821                 ret = ret2;
 822         }
 823         return ret;
 824 }
 825
 826 /* delete a transaction */
 827 static int partition_del_trans(struct ldb_module *module)
 828 {
 829         int ret, final_ret = LDB_SUCCESS;
 830         unsigned int i;
 831         struct partition_private_data *data = talloc_get_type(module->private_data,
 832                                                               struct partition_private_data);
 833         for (i=0; data && data->partitions && data->partitions[i]; i++) {
 834                 if ((module && module->ldb->flags & LDB_FLG_ENABLE_TRACING)) {
 835                         ldb_debug(module->ldb, LDB_DEBUG_TRACE, "partition_del_trans() -> %s",
 836                                   ldb_dn_get_linearized(data->partitions[i]->ctrl->dn));
 837                 }
 838                 ret = ldb_next_del_trans(data->partitions[i]->module);
 839                 if (ret != LDB_SUCCESS) {
 840                         ldb_asprintf_errstring(module->ldb, "del_trans error on %s: %s",
 841                                                ldb_dn_get_linearized(data->partitions[i]->ctrl->dn),
 842                                                ldb_errstring(module->ldb));
 843                         final_ret = ret;
 844                 }
 845         }
 846
 847         if (data->in_transaction == 0) {
 848                 DEBUG(0,("partition del transaction mismatch\n"));
 849                 return LDB_ERR_OPERATIONS_ERROR;
 850         }
 851         data->in_transaction--;
 852
 853         if ((module && module->ldb->flags & LDB_FLG_ENABLE_TRACING)) {
 854                 ldb_debug(module->ldb, LDB_DEBUG_TRACE, "partition_del_trans() -> (metadata partition)");
 855         }
 856         ret = ldb_next_del_trans(module);
 857         if (ret != LDB_SUCCESS) {
 858                 final_ret = ret;
 859         }
 860         return final_ret;
 861 }
 862
 863 int partition_primary_sequence_number(struct ldb_module *module, TALLOC_CTX *mem_ctx,
 864                                      enum ldb_sequence_type type, uint64_t *seq_number)
 865 {
 866         int ret;
 867         struct ldb_result *res;
 868         struct ldb_seqnum_request *tseq;
 869         struct ldb_request *treq;
 870         struct ldb_seqnum_result *seqr;
 871         res = talloc_zero(mem_ctx, struct ldb_result);
 872         if (res == NULL) {
 873                 return LDB_ERR_OPERATIONS_ERROR;
 874         }
 875         tseq = talloc_zero(res, struct ldb_seqnum_request);
 876         if (tseq == NULL) {
 877                 talloc_free(res);
 878                 return LDB_ERR_OPERATIONS_ERROR;
 879         }
 880         tseq->type = type;
 881
 882         ret = ldb_build_extended_req(&treq, ldb_module_get_ctx(module), res,
 883                                      LDB_EXTENDED_SEQUENCE_NUMBER,
 884                                      tseq,
 885                                      NULL,
 886                                      res,
 887                                      ldb_extended_default_callback,
 888                                      NULL);
 889         if (ret != LDB_SUCCESS) {
 890                 talloc_free(res);
 891                 return ret;
 892         }
 893
 894         ret = ldb_next_request(module, treq);
 895         if (ret != LDB_SUCCESS) {
 896                 talloc_free(res);
 897                 return ret;
 898         }
 899         ret = ldb_wait(treq->handle, LDB_WAIT_ALL);
 900         if (ret != LDB_SUCCESS) {
 901                 talloc_free(res);
 902                 return ret;
 903         }
 904
 905         seqr = talloc_get_type(res->extended->data,
 906                                struct ldb_seqnum_result);
 907         if (seqr->flags & LDB_SEQ_TIMESTAMP_SEQUENCE) {
 908                 ret = LDB_ERR_OPERATIONS_ERROR;
 909                 ldb_set_errstring(ldb_module_get_ctx(module), "Primary backend in partitions module returned a timestamp based seq number (must return a normal number)");
 910                 talloc_free(res);
 911                 return ret;
 912         } else {
 913                 *seq_number = seqr->seq_num;
 914         }
 915         talloc_free(res);
 916         return LDB_SUCCESS;
 917 }
 918
 919 /* FIXME: This function is still semi-async */
 920 static int partition_sequence_number(struct ldb_module *module, struct ldb_request *req)
 921 {
 922         int ret;
 923         unsigned int i;
 924         uint64_t seq_number = 0;
 925         uint64_t timestamp_sequence = 0;
 926         uint64_t timestamp = 0;
 927         struct partition_private_data *data = talloc_get_type(module->private_data,
 928                                                               struct partition_private_data);
 929         struct ldb_seqnum_request *seq;
 930         struct ldb_seqnum_result *seqr;
 931         struct ldb_request *treq;
 932         struct ldb_seqnum_request *tseq;
 933         struct ldb_seqnum_result *tseqr;
 934         struct ldb_extended *ext;
 935         struct ldb_result *res;
 936         struct dsdb_partition *p;
 937
 938         p = find_partition(data, NULL, req);
 939         if (p != NULL) {
 940                 /* the caller specified what partition they want the
 941                  * sequence number operation on - just pass it on
 942                  */
 943                 return ldb_next_request(p->module, req);
 944         }
 945
 946         seq = talloc_get_type(req->op.extended.data, struct ldb_seqnum_request);
 947
 948         switch (seq->type) {
 949         case LDB_SEQ_NEXT:
 950         case LDB_SEQ_HIGHEST_SEQ:
 951
 952                 ret = partition_primary_sequence_number(module, req, seq->type, &seq_number);
 953                 if (ret != LDB_SUCCESS) {
 954                         return ret;
 955                 }
 956
 957                 /* Skip the lot if 'data' isn't here yet (initialisation) */
 958                 for (i=0; data && data->partitions && data->partitions[i]; i++) {
 959
 960                         res = talloc_zero(req, struct ldb_result);
 961                         if (res == NULL) {
 962                                 return LDB_ERR_OPERATIONS_ERROR;
 963                         }
 964                         tseq = talloc_zero(res, struct ldb_seqnum_request);
 965                         if (tseq == NULL) {
 966                                 talloc_free(res);
 967                                 return LDB_ERR_OPERATIONS_ERROR;
 968                         }
 969                         tseq->type = seq->type;
 970
 971                         ret = ldb_build_extended_req(&treq, ldb_module_get_ctx(module), res,
 972                                                      LDB_EXTENDED_SEQUENCE_NUMBER,
 973                                                      tseq,
 974                                                      NULL,
 975                                                      res,
 976                                                      ldb_extended_default_callback,
 977                                                      NULL);
 978                         if (ret != LDB_SUCCESS) {
 979                                 talloc_free(res);
 980                                 return ret;
 981                         }
 982
 983                         if (!ldb_request_get_control(treq, DSDB_CONTROL_CURRENT_PARTITION_OID)) {
 984                                 ret = ldb_request_add_control(treq,
 985                                                               DSDB_CONTROL_CURRENT_PARTITION_OID,
 986                                                               false, data->partitions[i]->ctrl);
 987                                 if (ret != LDB_SUCCESS) {
 988                                         talloc_free(res);
 989                                         return ret;
 990                                 }
 991                         }
 992
 993                         ret = partition_request(data->partitions[i]->module, treq);
 994                         if (ret != LDB_SUCCESS) {
 995                                 talloc_free(res);
 996                                 return ret;
 997                         }
 998                         ret = ldb_wait(treq->handle, LDB_WAIT_ALL);
 999                         if (ret != LDB_SUCCESS) {
1000                                 talloc_free(res);
1001                                 return ret;
1002                         }
1003                         tseqr = talloc_get_type(res->extended->data,
1004                                                 struct ldb_seqnum_result);
1005                         if (tseqr->flags & LDB_SEQ_TIMESTAMP_SEQUENCE) {
1006                                 timestamp_sequence = MAX(timestamp_sequence,
1007                                                          tseqr->seq_num);
1008                         } else {
1009                                 seq_number += tseqr->seq_num;
1010                         }
1011                         talloc_free(res);
1012                 }
1013                 /* fall through */
1014         case LDB_SEQ_HIGHEST_TIMESTAMP:
1015
1016                 res = talloc_zero(req, struct ldb_result);
1017                 if (res == NULL) {
1018                         return LDB_ERR_OPERATIONS_ERROR;
1019                 }
1020
1021                 tseq = talloc_zero(res, struct ldb_seqnum_request);
1022                 if (tseq == NULL) {
1023                         talloc_free(res);
1024                         return LDB_ERR_OPERATIONS_ERROR;
1025                 }
1026                 tseq->type = LDB_SEQ_HIGHEST_TIMESTAMP;
1027
1028                 ret = ldb_build_extended_req(&treq, ldb_module_get_ctx(module), res,
1029                                              LDB_EXTENDED_SEQUENCE_NUMBER,
1030                                              tseq,
1031                                              NULL,
1032                                              res,
1033                                              ldb_extended_default_callback,
1034                                              NULL);
1035                 if (ret != LDB_SUCCESS) {
1036                         talloc_free(res);
1037                         return ret;
1038                 }
1039
1040                 ret = ldb_next_request(module, treq);
1041                 if (ret != LDB_SUCCESS) {
1042                         talloc_free(res);
1043                         return ret;
1044                 }
1045                 ret = ldb_wait(treq->handle, LDB_WAIT_ALL);
1046                 if (ret != LDB_SUCCESS) {
1047                         talloc_free(res);
1048                         return ret;
1049                 }
1050
1051                 tseqr = talloc_get_type(res->extended->data,
1052                                            struct ldb_seqnum_result);
1053                 timestamp = tseqr->seq_num;
1054
1055                 talloc_free(res);
1056
1057                 /* Skip the lot if 'data' isn't here yet (initialisation) */
1058                 for (i=0; data && data->partitions && data->partitions[i]; i++) {
1059
1060                         res = talloc_zero(req, struct ldb_result);
1061                         if (res == NULL) {
1062                                 return LDB_ERR_OPERATIONS_ERROR;
1063                         }
1064
1065                         tseq = talloc_zero(res, struct ldb_seqnum_request);
1066                         if (tseq == NULL) {
1067                                 talloc_free(res);
1068                                 return LDB_ERR_OPERATIONS_ERROR;
1069                         }
1070                         tseq->type = LDB_SEQ_HIGHEST_TIMESTAMP;
1071
1072                         ret = ldb_build_extended_req(&treq, ldb_module_get_ctx(module), res,
1073                                                      LDB_EXTENDED_SEQUENCE_NUMBER,
1074                                                      tseq,
1075                                                      NULL,
1076                                                      res,
1077                                                      ldb_extended_default_callback,
1078                                                      NULL);
1079                         if (ret != LDB_SUCCESS) {
1080                                 talloc_free(res);
1081                                 return ret;
1082                         }
1083
1084                         if (!ldb_request_get_control(treq, DSDB_CONTROL_CURRENT_PARTITION_OID)) {
1085                                 ret = ldb_request_add_control(treq,
1086                                                               DSDB_CONTROL_CURRENT_PARTITION_OID,
1087                                                               false, data->partitions[i]->ctrl);
1088                                 if (ret != LDB_SUCCESS) {
1089                                         talloc_free(res);
1090                                         return ret;
1091                                 }
1092                         }
1093
1094                         ret = partition_request(data->partitions[i]->module, treq);
1095                         if (ret != LDB_SUCCESS) {
1096                                 talloc_free(res);
1097                                 return ret;
1098                         }
1099                         ret = ldb_wait(treq->handle, LDB_WAIT_ALL);
1100                         if (ret != LDB_SUCCESS) {
1101                                 talloc_free(res);
1102                                 return ret;
1103                         }
1104
1105                         tseqr = talloc_get_type(res->extended->data,
1106                                                   struct ldb_seqnum_result);
1107                         timestamp = MAX(timestamp, tseqr->seq_num);
1108
1109                         talloc_free(res);
1110                 }
1111
1112                 break;
1113         }
1114
1115         ext = talloc_zero(req, struct ldb_extended);
1116         if (!ext) {
1117                 return LDB_ERR_OPERATIONS_ERROR;
1118         }
1119         seqr = talloc_zero(ext, struct ldb_seqnum_result);
1120         if (seqr == NULL) {
1121                 talloc_free(ext);
1122                 return LDB_ERR_OPERATIONS_ERROR;
1123         }
1124         ext->oid = LDB_EXTENDED_SEQUENCE_NUMBER;
1125         ext->data = seqr;
1126
1127         switch (seq->type) {
1128         case LDB_SEQ_NEXT:
1129         case LDB_SEQ_HIGHEST_SEQ:
1130
1131                 /* Has someone above set a timebase sequence? */
1132                 if (timestamp_sequence) {
1133                         seqr->seq_num = (((unsigned long long)timestamp << 24) | (seq_number & 0xFFFFFF));
1134                 } else {
1135                         seqr->seq_num = seq_number;
1136                 }
1137
1138                 if (timestamp_sequence > seqr->seq_num) {
1139                         seqr->seq_num = timestamp_sequence;
1140                         seqr->flags |= LDB_SEQ_TIMESTAMP_SEQUENCE;
1141                 }
1142
1143                 seqr->flags |= LDB_SEQ_GLOBAL_SEQUENCE;
1144                 break;
1145         case LDB_SEQ_HIGHEST_TIMESTAMP:
1146                 seqr->seq_num = timestamp;
1147                 break;
1148         }
1149
1150         if (seq->type == LDB_SEQ_NEXT) {
1151                 seqr->seq_num++;
1152         }
1153
1154         /* send request done */
1155         return ldb_module_done(req, NULL, ext, LDB_SUCCESS);
1156 }
1157
1158 /* extended */
1159 static int partition_extended(struct ldb_module *module, struct ldb_request *req)
1160 {
1161         struct partition_private_data *data;
1162         struct partition_context *ac;
1163         int ret;
1164
1165         data = talloc_get_type(module->private_data, struct partition_private_data);
1166         if (!data) {
1167                 return ldb_next_request(module, req);
1168         }
1169
1170         ret = partition_reload_if_required(module, data);
1171         if (ret != LDB_SUCCESS) {
1172                 return ret;
1173         }
1174
1175         if (strcmp(req->op.extended.oid, LDB_EXTENDED_SEQUENCE_NUMBER) == 0) {
1176                 return partition_sequence_number(module, req);
1177         }
1178
1179         if (strcmp(req->op.extended.oid, DSDB_EXTENDED_CREATE_PARTITION_OID) == 0) {
1180                 return partition_create(module, req);
1181         }
1182
1183         /*
1184          * as the extended operation has no dn
1185          * we need to send it to all partitions
1186          */
1187
1188         ac = partition_init_ctx(module, req);
1189         if (!ac) {
1190                 return LDB_ERR_OPERATIONS_ERROR;
1191         }
1192
1193         return partition_send_all(module, ac, req);
1194 }
1195
1196 _PUBLIC_ const struct ldb_module_ops ldb_partition_module_ops = {
1197         .name              = "partition",
1198         .init_context      = partition_init,
1199         .search            = partition_search,
1200         .add               = partition_add,
1201         .modify            = partition_modify,
1202         .del               = partition_delete,
1203         .rename            = partition_rename,
1204         .extended          = partition_extended,
1205         .start_transaction = partition_start_trans,
1206         .prepare_commit    = partition_prepare_commit,
1207         .end_transaction   = partition_end_trans,
1208         .del_transaction   = partition_del_trans,
1209 };