source4/dsdb/samdb/ldb_modules/partition.c

   1 /*
   2    Partitions ldb module
   3
   4    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2006
   5
   6    * NOTICE: this module is NOT released under the GNU LGPL license as
   7    * other ldb code. This module is release under the GNU GPL v2 or
   8    * later license.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25 /*
  26  *  Name: ldb
  27  *
  28  *  Component: ldb partitions module
  29  *
  30  *  Description: Implement LDAP partitions
  31  *
  32  *  Author: Andrew Bartlett
  33  */
  34
  35 #include "includes.h"
  36 #include "ldb/include/includes.h"
  37
  38 struct partition {
  39         struct ldb_module *module;
  40         const char *backend;
  41         struct ldb_dn *dn;
  42 };
  43 struct partition_private_data {
  44         struct partition **partitions;
  45         struct ldb_dn **replicate;
  46 };
  47
  48 struct partition_context {
  49         struct ldb_module *module;
  50         struct ldb_request *orig_req;
  51
  52         struct ldb_request **down_req;
  53         int num_requests;
  54         int finished_requests;
  55 };
  56
  57 static struct ldb_handle *partition_init_handle(struct ldb_request *req, struct ldb_module *module)
  58 {
  59         struct partition_context *ac;
  60         struct ldb_handle *h;
  61
  62         h = talloc_zero(req, struct ldb_handle);
  63         if (h == NULL) {
  64                 ldb_set_errstring(module->ldb, "Out of Memory");
  65                 return NULL;
  66         }
  67
  68         h->module = module;
  69
  70         ac = talloc_zero(h, struct partition_context);
  71         if (ac == NULL) {
  72                 ldb_set_errstring(module->ldb, "Out of Memory");
  73                 talloc_free(h);
  74                 return NULL;
  75         }
  76
  77         h->private_data = (void *)ac;
  78
  79         ac->module = module;
  80         ac->orig_req = req;
  81
  82         return h;
  83 }
  84
  85 struct ldb_module *make_module_for_next_request(TALLOC_CTX *mem_ctx,
  86                                                 struct ldb_context *ldb,
  87                                                 struct ldb_module *module)
  88 {
  89         struct ldb_module *current;
  90         static const struct ldb_module_ops ops; /* zero */
  91         current = talloc_zero(mem_ctx, struct ldb_module);
  92         if (current == NULL) {
  93                 return module;
  94         }
  95
  96         current->ldb = ldb;
  97         current->ops = &ops;
  98         current->prev = NULL;
  99         current->next = module;
 100         return current;
 101 }
 102
 103 struct ldb_module *find_backend(struct ldb_module *module, struct ldb_request *req, const struct ldb_dn *dn)
 104 {
 105         int i;
 106         struct partition_private_data *data = talloc_get_type(module->private_data,
 107                                                               struct partition_private_data);
 108         /* Look at base DN */
 109         /* Figure out which partition it is under */
 110         /* Skip the lot if 'data' isn't here yet (initialistion) */
 111         for (i=0; data && data->partitions && data->partitions[i]; i++) {
 112                 if (ldb_dn_compare_base(module->ldb,
 113                                         data->partitions[i]->dn,
 114                                         dn) == 0) {
 115                         return make_module_for_next_request(req, module->ldb, data->partitions[i]->module);
 116                 }
 117         }
 118
 119         return module;
 120 };
 121
 122
 123 /*
 124   fire the caller's callback for every entry, but only send 'done' once.
 125 */
 126 static int partition_search_callback(struct ldb_context *ldb, void *context, struct ldb_reply *ares)
 127 {
 128         struct partition_context *ac;
 129
 130         if (!context || !ares) {
 131                 ldb_set_errstring(ldb, "partition_search_callback: NULL Context or Result in 'search' callback");
 132                 goto error;
 133         }
 134
 135         ac = talloc_get_type(context, struct partition_context);
 136
 137         if (ares->type == LDB_REPLY_ENTRY) {
 138                 return ac->orig_req->callback(ldb, ac->orig_req->context, ares);
 139         } else {
 140                 ac->finished_requests++;
 141                 if (ac->finished_requests == ac->num_requests) {
 142                         return ac->orig_req->callback(ldb, ac->orig_req->context, ares);
 143                 } else {
 144                         talloc_free(ares);
 145                         return LDB_SUCCESS;
 146                 }
 147         }
 148 error:
 149         talloc_free(ares);
 150         return LDB_ERR_OPERATIONS_ERROR;
 151 }
 152
 153 /*
 154   only fire the 'last' callback, and only for START-TLS for now
 155 */
 156 static int partition_other_callback(struct ldb_context *ldb, void *context, struct ldb_reply *ares)
 157 {
 158         struct partition_context *ac;
 159
 160         if (!context) {
 161                 ldb_set_errstring(ldb, "partition_other_callback: NULL Context in 'other' callback");
 162                 goto error;
 163         }
 164
 165         ac = talloc_get_type(context, struct partition_context);
 166
 167         if (!ac->orig_req->callback) {
 168                 talloc_free(ares);
 169                 return LDB_SUCCESS;
 170         }
 171
 172         if (!ares
 173             || (ares->type == LDB_REPLY_EXTENDED
 174                 && strcmp(ares->response->oid, LDB_EXTENDED_START_TLS_OID))) {
 175                 ac->finished_requests++;
 176                 if (ac->finished_requests == ac->num_requests) {
 177                         return ac->orig_req->callback(ldb, ac->orig_req->context, ares);
 178                 }
 179                 talloc_free(ares);
 180                 return LDB_SUCCESS;
 181         }
 182         ldb_set_errstring(ldb, "partition_other_callback: Unknown reply type, only supports START_TLS");
 183 error:
 184         talloc_free(ares);
 185         return LDB_ERR_OPERATIONS_ERROR;
 186 }
 187
 188
 189 static int partition_send_request(struct partition_context *ac, struct ldb_module *partition)
 190 {
 191         int ret;
 192         struct ldb_module *next = make_module_for_next_request(ac->module, ac->module->ldb, partition);
 193
 194         ac->down_req = talloc_realloc(ac, ac->down_req,
 195                                         struct ldb_request *, ac->num_requests + 1);
 196         if (!ac->down_req) {
 197                 ldb_set_errstring(ac->module->ldb, "Out of Memory");
 198                 return LDB_ERR_OPERATIONS_ERROR;
 199         }
 200         ac->down_req[ac->num_requests] = talloc(ac, struct ldb_request);
 201         if (ac->down_req[ac->num_requests] == NULL) {
 202                 ldb_set_errstring(ac->module->ldb, "Out of Memory");
 203                 return LDB_ERR_OPERATIONS_ERROR;
 204         }
 205
 206         *ac->down_req[ac->num_requests] = *ac->orig_req; /* copy the request */
 207
 208         if (ac->down_req[ac->num_requests]->operation == LDB_SEARCH) {
 209                 ac->down_req[ac->num_requests]->callback = partition_search_callback;
 210                 ac->down_req[ac->num_requests]->context = ac;
 211         } else {
 212                 ac->down_req[ac->num_requests]->callback = partition_other_callback;
 213                 ac->down_req[ac->num_requests]->context = ac;
 214         }
 215
 216         /* Spray off search requests to all backends */
 217         ret = ldb_next_request(next, ac->down_req[ac->num_requests]);
 218         if (ret != LDB_SUCCESS) {
 219                 return ret;
 220         }
 221
 222         ac->num_requests++;
 223         return LDB_SUCCESS;
 224 }
 225
 226 /* Send a request down to all the partitions */
 227 static int partition_send_all(struct ldb_module *module,
 228                               struct partition_context *ac, struct ldb_request *req)
 229 {
 230         int i;
 231         struct partition_private_data *data = talloc_get_type(module->private_data,
 232                                                               struct partition_private_data);
 233         int ret = partition_send_request(ac, module->next);
 234         if (ret != LDB_SUCCESS) {
 235                 return ret;
 236         }
 237         for (i=0; data && data->partitions && data->partitions[i]; i++) {
 238                 ret = partition_send_request(ac, data->partitions[i]->module);
 239                 if (ret != LDB_SUCCESS) {
 240                         return ret;
 241                 }
 242         }
 243         return LDB_SUCCESS;
 244 }
 245
 246 /* Figure out which backend a request needs to be aimed at.  Some
 247  * requests must be replicated to all backends */
 248 static int partition_replicate(struct ldb_module *module, struct ldb_request *req, const struct ldb_dn *dn)
 249 {
 250         int i;
 251         struct ldb_module *backend;
 252         struct partition_private_data *data = talloc_get_type(module->private_data,
 253                                                               struct partition_private_data);
 254
 255         /* Is this a special DN, we need to replicate to every backend? */
 256         for (i=0; data->replicate && data->replicate[i]; i++) {
 257                 if (ldb_dn_compare(module->ldb,
 258                                    data->replicate[i],
 259                                    dn) == 0) {
 260                         struct ldb_handle *h;
 261                         struct partition_context *ac;
 262
 263                         h = partition_init_handle(req, module);
 264                         if (!h) {
 265                                 return LDB_ERR_OPERATIONS_ERROR;
 266                         }
 267                         /* return our own handle to deal with this call */
 268                         req->handle = h;
 269
 270                         ac = talloc_get_type(h->private_data, struct partition_context);
 271
 272                         return partition_send_all(module, ac, req);
 273                 }
 274         }
 275
 276         /* Otherwise, we need to find the backend to fire it to */
 277
 278         /* Find backend */
 279         backend = find_backend(module, req, dn);
 280
 281         /* issue request */
 282         return ldb_next_request(backend, req);
 283
 284 }
 285
 286 /* search */
 287 static int partition_search(struct ldb_module *module, struct ldb_request *req)
 288 {
 289         /* Find backend */
 290         struct partition_private_data *data = talloc_get_type(module->private_data,
 291                                                               struct partition_private_data);
 292         /* issue request */
 293
 294         /* (later) consider if we should be searching multiple
 295          * partitions (for 'invisible' partition behaviour */
 296         if (ldb_get_opaque(module->ldb, "global_catalog")) {
 297                 int ret, i;
 298                 struct ldb_handle *h;
 299                 struct partition_context *ac;
 300
 301                 h = partition_init_handle(req, module);
 302                 if (!h) {
 303                         return LDB_ERR_OPERATIONS_ERROR;
 304                 }
 305                 /* return our own handle to deal with this call */
 306                 req->handle = h;
 307
 308                 ac = talloc_get_type(h->private_data, struct partition_context);
 309
 310                 for (i=0; data && data->partitions && data->partitions[i]; i++) {
 311                         /* Find all partitions under the search base */
 312                         if (ldb_dn_compare_base(module->ldb,
 313                                                 req->op.search.base,
 314                                                 data->partitions[i]->dn) == 0) {
 315                                 ret = partition_send_request(ac, data->partitions[i]->module);
 316                                 if (ret != LDB_SUCCESS) {
 317                                         return ret;
 318                                 }
 319                         }
 320                 }
 321
 322                 /* Perhaps we didn't match any partitions.  Try the main partition, then all partitions */
 323                 if (ac->num_requests == 0) {
 324                         return partition_send_all(module, ac, req);
 325                 }
 326
 327                 return LDB_SUCCESS;
 328         } else {
 329                 struct ldb_module *backend = find_backend(module, req, req->op.search.base);
 330
 331                 return ldb_next_request(backend, req);
 332         }
 333 }
 334
 335 /* add */
 336 static int partition_add(struct ldb_module *module, struct ldb_request *req)
 337 {
 338         return partition_replicate(module, req, req->op.add.message->dn);
 339 }
 340
 341 /* modify */
 342 static int partition_modify(struct ldb_module *module, struct ldb_request *req)
 343 {
 344         return partition_replicate(module, req, req->op.mod.message->dn);
 345 }
 346
 347 /* delete */
 348 static int partition_delete(struct ldb_module *module, struct ldb_request *req)
 349 {
 350         return partition_replicate(module, req, req->op.del.dn);
 351 }
 352
 353 /* rename */
 354 static int partition_rename(struct ldb_module *module, struct ldb_request *req)
 355 {
 356         /* Find backend */
 357         struct ldb_module *backend = find_backend(module, req, req->op.rename.olddn);
 358         struct ldb_module *backend2 = find_backend(module, req, req->op.rename.newdn);
 359
 360         if (backend->next != backend2->next) {
 361                 return LDB_ERR_AFFECTS_MULTIPLE_DSAS;
 362         }
 363
 364         return partition_replicate(module, req, req->op.rename.olddn);
 365 }
 366
 367 /* start a transaction */
 368 static int partition_start_trans(struct ldb_module *module)
 369 {
 370         int i, ret;
 371         struct partition_private_data *data = talloc_get_type(module->private_data,
 372                                                               struct partition_private_data);
 373         /* Look at base DN */
 374         /* Figure out which partition it is under */
 375         /* Skip the lot if 'data' isn't here yet (initialistion) */
 376         ret = ldb_next_start_trans(module);
 377         if (ret != LDB_SUCCESS) {
 378                 return ret;
 379         }
 380
 381         for (i=0; data && data->partitions && data->partitions[i]; i++) {
 382                 struct ldb_module *next = make_module_for_next_request(module, module->ldb, data->partitions[i]->module);
 383
 384                 ret = ldb_next_start_trans(next);
 385                 talloc_free(next);
 386                 if (ret != LDB_SUCCESS) {
 387                         /* Back it out, if it fails on one */
 388                         for (i--; i >= 0; i--) {
 389                                 next = make_module_for_next_request(module, module->ldb, data->partitions[i]->module);
 390                                 ldb_next_del_trans(next);
 391                                 talloc_free(next);
 392                         }
 393                         return ret;
 394                 }
 395         }
 396         return LDB_SUCCESS;
 397 }
 398
 399 /* end a transaction */
 400 static int partition_end_trans(struct ldb_module *module)
 401 {
 402         int i, ret, ret2 = LDB_SUCCESS;
 403         struct partition_private_data *data = talloc_get_type(module->private_data,
 404                                                               struct partition_private_data);
 405         ret = ldb_next_end_trans(module);
 406         if (ret != LDB_SUCCESS) {
 407                 return ret;
 408         }
 409
 410         /* Look at base DN */
 411         /* Figure out which partition it is under */
 412         /* Skip the lot if 'data' isn't here yet (initialistion) */
 413         for (i=0; data && data->partitions && data->partitions[i]; i++) {
 414                 struct ldb_module *next = make_module_for_next_request(module, module->ldb, data->partitions[i]->module);
 415
 416                 ret = ldb_next_end_trans(next);
 417                 talloc_free(next);
 418                 if (ret != LDB_SUCCESS) {
 419                         ret2 = ret;
 420                 }
 421         }
 422
 423         if (ret != LDB_SUCCESS) {
 424                 /* Back it out, if it fails on one */
 425                 for (i=0; data && data->partitions && data->partitions[i]; i++) {
 426                         struct ldb_module *next = make_module_for_next_request(module, module->ldb, data->partitions[i]->module);
 427                         ldb_next_del_trans(next);
 428                         talloc_free(next);
 429                 }
 430         }
 431         return ret;
 432 }
 433
 434 /* delete a transaction */
 435 static int partition_del_trans(struct ldb_module *module)
 436 {
 437         int i, ret, ret2 = LDB_SUCCESS;
 438         struct partition_private_data *data = talloc_get_type(module->private_data,
 439                                                               struct partition_private_data);
 440         ret = ldb_next_del_trans(module);
 441         if (ret != LDB_SUCCESS) {
 442                 ret2 = ret;
 443         }
 444
 445         /* Look at base DN */
 446         /* Figure out which partition it is under */
 447         /* Skip the lot if 'data' isn't here yet (initialistion) */
 448         for (i=0; data && data->partitions && data->partitions[i]; i++) {
 449                 struct ldb_module *next = make_module_for_next_request(module, module->ldb, data->partitions[i]->module);
 450
 451                 ret = ldb_next_del_trans(next);
 452                 talloc_free(next);
 453                 if (ret != LDB_SUCCESS) {
 454                         ret2 = ret;
 455                 }
 456         }
 457         return ret2;
 458 }
 459
 460 static int partition_sequence_number(struct ldb_module *module, struct ldb_request *req)
 461 {
 462         int i, ret;
 463         uint64_t seq_number = 0;
 464         struct partition_private_data *data = talloc_get_type(module->private_data,
 465                                                               struct partition_private_data);
 466         ret = ldb_next_request(module, req);
 467         if (ret != LDB_SUCCESS) {
 468                 return ret;
 469         }
 470         seq_number = seq_number + req->op.seq_num.seq_num;
 471
 472         /* Look at base DN */
 473         /* Figure out which partition it is under */
 474         /* Skip the lot if 'data' isn't here yet (initialistion) */
 475         for (i=0; data && data->partitions && data->partitions[i]; i++) {
 476                 struct ldb_module *next = make_module_for_next_request(req, module->ldb, data->partitions[i]->module);
 477
 478                 ret = ldb_next_request(next, req);
 479                 talloc_free(next);
 480                 if (ret != LDB_SUCCESS) {
 481                         return ret;
 482                 }
 483                 seq_number = seq_number + req->op.seq_num.seq_num;
 484         }
 485         req->op.seq_num.seq_num = seq_number;
 486         return LDB_SUCCESS;
 487 }
 488
 489 static int sort_compare(void *void1,
 490                         void *void2, void *opaque)
 491 {
 492         struct ldb_context *ldb = talloc_get_type(opaque, struct ldb_context);
 493         struct partition **pp1 = void1;
 494         struct partition **pp2 = void2;
 495         struct partition *partition1 = talloc_get_type(*pp1, struct partition);
 496         struct partition *partition2 = talloc_get_type(*pp2, struct partition);
 497
 498         return ldb_dn_compare(ldb, partition1->dn, partition2->dn);
 499 }
 500
 501 static int partition_init(struct ldb_module *module)
 502 {
 503         int ret, i;
 504         TALLOC_CTX *mem_ctx = talloc_new(module);
 505         static const char *attrs[] = { "partition", "replicateEntries", "modules", NULL };
 506         struct ldb_result *res;
 507         struct ldb_message *msg;
 508         struct ldb_message_element *partition_attributes;
 509         struct ldb_message_element *replicate_attributes;
 510         struct ldb_message_element *modules_attributes;
 511
 512         struct partition_private_data *data;
 513
 514         if (!mem_ctx) {
 515                 return LDB_ERR_OPERATIONS_ERROR;
 516         }
 517
 518         data = talloc(mem_ctx, struct partition_private_data);
 519         if (data == NULL) {
 520                 return LDB_ERR_OPERATIONS_ERROR;
 521         }
 522
 523         ret = ldb_search(module->ldb, ldb_dn_explode(mem_ctx, "@PARTITION"),
 524                          LDB_SCOPE_BASE,
 525                          NULL, attrs,
 526                          &res);
 527         if (ret != LDB_SUCCESS) {
 528                 talloc_free(mem_ctx);
 529                 return ret;
 530         }
 531         talloc_steal(mem_ctx, res);
 532         if (res->count == 0) {
 533                 talloc_free(mem_ctx);
 534                 return ldb_next_init(module);
 535         }
 536
 537         if (res->count > 1) {
 538                 talloc_free(mem_ctx);
 539                 return LDB_ERR_CONSTRAINT_VIOLATION;
 540         }
 541
 542         msg = res->msgs[0];
 543
 544         partition_attributes = ldb_msg_find_element(msg, "partition");
 545         if (!partition_attributes) {
 546                 ldb_set_errstring(module->ldb, "partition_init: no partitions specified");
 547                 talloc_free(mem_ctx);
 548                 return LDB_ERR_CONSTRAINT_VIOLATION;
 549         }
 550         data->partitions = talloc_array(data, struct partition *, partition_attributes->num_values + 1);
 551         if (!data->partitions) {
 552                 talloc_free(mem_ctx);
 553                 return LDB_ERR_OPERATIONS_ERROR;
 554         }
 555         for (i=0; i < partition_attributes->num_values; i++) {
 556                 char *base = talloc_strdup(data->partitions, (char *)partition_attributes->values[i].data);
 557                 char *p = strchr(base, ':');
 558                 if (!p) {
 559                         ldb_asprintf_errstring(module->ldb,
 560                                                 "partition_init: "
 561                                                 "invalid form for partition record (missing ':'): %s", base);
 562                         talloc_free(mem_ctx);
 563                         return LDB_ERR_CONSTRAINT_VIOLATION;
 564                 }
 565                 p[0] = '\0';
 566                 p++;
 567                 if (!p[0]) {
 568                         ldb_asprintf_errstring(module->ldb,
 569                                                 "partition_init: "
 570                                                 "invalid form for partition record (missing backend database): %s", base);
 571                         talloc_free(mem_ctx);
 572                         return LDB_ERR_CONSTRAINT_VIOLATION;
 573                 }
 574                 data->partitions[i] = talloc(data->partitions, struct partition);
 575                 if (!data->partitions[i]) {
 576                         talloc_free(mem_ctx);
 577                         return LDB_ERR_OPERATIONS_ERROR;
 578                 }
 579
 580                 data->partitions[i]->dn = ldb_dn_explode(data->partitions[i], base);
 581                 if (!data->partitions[i]->dn) {
 582                         ldb_asprintf_errstring(module->ldb,
 583                                                 "partition_init: invalid DN in partition record: %s", base);
 584                         talloc_free(mem_ctx);
 585                         return LDB_ERR_CONSTRAINT_VIOLATION;
 586                 }
 587
 588                 data->partitions[i]->backend = private_path(data->partitions[i], p);
 589                 ret = ldb_connect_backend(module->ldb, data->partitions[i]->backend, NULL, &data->partitions[i]->module);
 590                 if (ret != LDB_SUCCESS) {
 591                         talloc_free(mem_ctx);
 592                         return ret;
 593                 }
 594         }
 595         data->partitions[i] = NULL;
 596
 597         /* sort these into order, most to least specific */
 598         ldb_qsort(data->partitions, partition_attributes->num_values, sizeof(*data->partitions),
 599                   module->ldb, sort_compare);
 600
 601         for (i=0; data->partitions[i]; i++) {
 602                 struct ldb_request *req;
 603                 req = talloc_zero(mem_ctx, struct ldb_request);
 604                 if (req == NULL) {
 605                         ldb_debug(module->ldb, LDB_DEBUG_ERROR, "partition: Out of memory!\n");
 606                         talloc_free(mem_ctx);
 607                         return LDB_ERR_OPERATIONS_ERROR;
 608                 }
 609
 610                 req->operation = LDB_REQ_REGISTER_PARTITION;
 611                 req->op.reg_partition.dn = data->partitions[i]->dn;
 612
 613                 ret = ldb_request(module->ldb, req);
 614                 if (ret != LDB_SUCCESS) {
 615                         ldb_debug(module->ldb, LDB_DEBUG_ERROR, "partition: Unable to register partition with rootdse!\n");
 616                         talloc_free(mem_ctx);
 617                         return LDB_ERR_OTHER;
 618                 }
 619                 talloc_free(req);
 620         }
 621
 622         replicate_attributes = ldb_msg_find_element(msg, "replicateEntries");
 623         if (!replicate_attributes) {
 624                 data->replicate = NULL;
 625         } else {
 626                 data->replicate = talloc_array(data, struct ldb_dn *, replicate_attributes->num_values + 1);
 627                 if (!data->replicate) {
 628                         talloc_free(mem_ctx);
 629                         return LDB_ERR_OPERATIONS_ERROR;
 630                 }
 631
 632                 for (i=0; i < replicate_attributes->num_values; i++) {
 633                         data->replicate[i] = ldb_dn_explode(data->replicate, replicate_attributes->values[i].data);
 634                         if (!data->replicate[i]) {
 635                                 ldb_asprintf_errstring(module->ldb,
 636                                                         "partition_init: "
 637                                                         "invalid DN in partition replicate record: %s",
 638                                                         replicate_attributes->values[i].data);
 639                                 talloc_free(mem_ctx);
 640                                 return LDB_ERR_CONSTRAINT_VIOLATION;
 641                         }
 642                 }
 643                 data->replicate[i] = NULL;
 644         }
 645
 646         /* Make the private data available to any searches the modules may trigger in initialisation */
 647         module->private_data = data;
 648         talloc_steal(module, data);
 649
 650         modules_attributes = ldb_msg_find_element(msg, "modules");
 651         if (modules_attributes) {
 652                 for (i=0; i < modules_attributes->num_values; i++) {
 653                         struct ldb_dn *base_dn;
 654                         int partition_idx;
 655                         struct partition *partition = NULL;
 656                         const char **modules = NULL;
 657
 658                         char *base = talloc_strdup(data->partitions, (char *)modules_attributes->values[i].data);
 659                         char *p = strchr(base, ':');
 660                         if (!p) {
 661                                 ldb_asprintf_errstring(module->ldb,
 662                                                         "partition_init: "
 663                                                         "invalid form for partition module record (missing ':'): %s", base);
 664                                 talloc_free(mem_ctx);
 665                                 return LDB_ERR_CONSTRAINT_VIOLATION;
 666                         }
 667                         p[0] = '\0';
 668                         p++;
 669                         if (!p[0]) {
 670                                 ldb_asprintf_errstring(module->ldb,
 671                                                         "partition_init: "
 672                                                         "invalid form for partition module record (missing backend database): %s", base);
 673                                 talloc_free(mem_ctx);
 674                                 return LDB_ERR_CONSTRAINT_VIOLATION;
 675                         }
 676
 677                         modules = ldb_modules_list_from_string(module->ldb, mem_ctx,
 678                                                                p);
 679
 680                         base_dn = ldb_dn_explode(mem_ctx, base);
 681                         if (!base_dn) {
 682                                 talloc_free(mem_ctx);
 683                                 return LDB_ERR_OPERATIONS_ERROR;
 684                         }
 685
 686                         for (partition_idx = 0; data->partitions[partition_idx]; partition_idx++) {
 687                                 if (ldb_dn_compare(module->ldb, data->partitions[partition_idx]->dn,
 688                                                    base_dn) == 0) {
 689                                         partition = data->partitions[partition_idx];
 690                                         break;
 691                                 }
 692                         }
 693
 694                         if (!partition) {
 695                                 ldb_asprintf_errstring(module->ldb,
 696                                                         "partition_init: "
 697                                                         "invalid form for partition module record (no such partition): %s", base);
 698                                 talloc_free(mem_ctx);
 699                                 return LDB_ERR_CONSTRAINT_VIOLATION;
 700                         }
 701
 702                         ret = ldb_load_modules_list(module->ldb, modules, partition->module, &partition->module);
 703                         if (ret != LDB_SUCCESS) {
 704                                 talloc_free(mem_ctx);
 705                                 return ret;
 706                         }
 707                         ret = ldb_init_module_chain(module->ldb, partition->module);
 708                         if (ret != LDB_SUCCESS) {
 709                                 talloc_free(mem_ctx);
 710                                 return ret;
 711                         }
 712                 }
 713         }
 714
 715         talloc_free(mem_ctx);
 716         return ldb_next_init(module);
 717 }
 718
 719 static int partition_wait_none(struct ldb_handle *handle) {
 720         struct partition_context *ac;
 721         int ret;
 722         int i;
 723
 724         if (!handle || !handle->private_data) {
 725                 return LDB_ERR_OPERATIONS_ERROR;
 726         }
 727
 728         if (handle->state == LDB_ASYNC_DONE) {
 729                 return handle->status;
 730         }
 731
 732         handle->state = LDB_ASYNC_PENDING;
 733         handle->status = LDB_SUCCESS;
 734
 735         ac = talloc_get_type(handle->private_data, struct partition_context);
 736
 737         for (i=0; i < ac->num_requests; i++) {
 738                 ret = ldb_wait(ac->down_req[i]->handle, LDB_WAIT_NONE);
 739
 740                 if (ret != LDB_SUCCESS) {
 741                         handle->status = ret;
 742                         goto done;
 743                 }
 744                 if (ac->down_req[i]->handle->status != LDB_SUCCESS) {
 745                         handle->status = ac->down_req[i]->handle->status;
 746                         goto done;
 747                 }
 748
 749                 if (ac->down_req[i]->handle->state != LDB_ASYNC_DONE) {
 750                         return LDB_SUCCESS;
 751                 }
 752         }
 753
 754         ret = LDB_SUCCESS;
 755
 756 done:
 757         handle->state = LDB_ASYNC_DONE;
 758         return ret;
 759 }
 760
 761
 762 static int partition_wait_all(struct ldb_handle *handle) {
 763
 764         int ret;
 765
 766         while (handle->state != LDB_ASYNC_DONE) {
 767                 ret = partition_wait_none(handle);
 768                 if (ret != LDB_SUCCESS) {
 769                         return ret;
 770                 }
 771         }
 772
 773         return handle->status;
 774 }
 775
 776 static int partition_wait(struct ldb_handle *handle, enum ldb_wait_type type)
 777 {
 778         if (type == LDB_WAIT_ALL) {
 779                 return partition_wait_all(handle);
 780         } else {
 781                 return partition_wait_none(handle);
 782         }
 783 }
 784
 785 static const struct ldb_module_ops partition_ops = {
 786         .name              = "partition",
 787         .init_context      = partition_init,
 788         .search            = partition_search,
 789         .add               = partition_add,
 790         .modify            = partition_modify,
 791         .del               = partition_delete,
 792         .rename            = partition_rename,
 793         .start_transaction = partition_start_trans,
 794         .end_transaction   = partition_end_trans,
 795         .del_transaction   = partition_del_trans,
 796         .sequence_number   = partition_sequence_number,
 797         .wait              = partition_wait
 798 };
 799
 800 int ldb_partition_init(void)
 801 {
 802         return ldb_register_module(&partition_ops);
 803 }