source4/lib/ldb/common/ldb_modules.c

   1 /*
   2    ldb database library
   3
   4    Copyright (C) Simo Sorce  2004-2008
   5
   6      ** NOTE! The following LGPL license applies to the ldb
   7      ** library. This does NOT imply that all of Samba is released
   8      ** under the LGPL
   9
  10    This library is free software; you can redistribute it and/or
  11    modify it under the terms of the GNU Lesser General Public
  12    License as published by the Free Software Foundation; either
  13    version 3 of the License, or (at your option) any later version.
  14
  15    This library 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 GNU
  18    Lesser General Public License for more details.
  19
  20    You should have received a copy of the GNU Lesser General Public
  21    License along with this library; if not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 /*
  25  *  Name: ldb
  26  *
  27  *  Component: ldb modules core
  28  *
  29  *  Description: core modules routines
  30  *
  31  *  Author: Simo Sorce
  32  */
  33
  34 #include "ldb_private.h"
  35
  36 #if (_SAMBA_BUILD_ >= 4)
  37 #include "includes.h"
  38 #endif
  39
  40 #define LDB_MODULE_PREFIX       "modules:"
  41 #define LDB_MODULE_PREFIX_LEN   8
  42
  43 static void *ldb_dso_load_symbol(struct ldb_context *ldb, const char *name,
  44                                  const char *symbol);
  45
  46 void ldb_set_modules_dir(struct ldb_context *ldb, const char *path)
  47 {
  48         talloc_free(ldb->modules_dir);
  49         ldb->modules_dir = talloc_strdup(ldb, path);
  50 }
  51
  52 static char *ldb_modules_strdup_no_spaces(TALLOC_CTX *mem_ctx, const char *string)
  53 {
  54         int i, len;
  55         char *trimmed;
  56
  57         trimmed = talloc_strdup(mem_ctx, string);
  58         if (!trimmed) {
  59                 return NULL;
  60         }
  61
  62         len = strlen(trimmed);
  63         for (i = 0; trimmed[i] != '\0'; i++) {
  64                 switch (trimmed[i]) {
  65                 case ' ':
  66                 case '\t':
  67                 case '\n':
  68                         memmove(&trimmed[i], &trimmed[i + 1], len -i -1);
  69                         break;
  70                 }
  71         }
  72
  73         return trimmed;
  74 }
  75
  76
  77 /* modules are called in inverse order on the stack.
  78    Lets place them as an admin would think the right order is.
  79    Modules order is important */
  80 const char **ldb_modules_list_from_string(struct ldb_context *ldb, TALLOC_CTX *mem_ctx, const char *string)
  81 {
  82         char **modules = NULL;
  83         const char **m;
  84         char *modstr, *p;
  85         int i;
  86
  87         /* spaces not admitted */
  88         modstr = ldb_modules_strdup_no_spaces(mem_ctx, string);
  89         if ( ! modstr) {
  90                 ldb_debug(ldb, LDB_DEBUG_FATAL, "Out of Memory in ldb_modules_strdup_no_spaces()\n");
  91                 return NULL;
  92         }
  93
  94         modules = talloc_realloc(mem_ctx, modules, char *, 2);
  95         if ( ! modules ) {
  96                 ldb_debug(ldb, LDB_DEBUG_FATAL, "Out of Memory in ldb_modules_list_from_string()\n");
  97                 talloc_free(modstr);
  98                 return NULL;
  99         }
 100         talloc_steal(modules, modstr);
 101
 102         i = 0;
 103         /* The str*r*chr walks backwards:  This is how we get the inverse order mentioned above */
 104         while ((p = strrchr(modstr, ',')) != NULL) {
 105                 *p = '\0';
 106                 p++;
 107                 modules[i] = p;
 108
 109                 i++;
 110                 modules = talloc_realloc(mem_ctx, modules, char *, i + 2);
 111                 if ( ! modules ) {
 112                         ldb_debug(ldb, LDB_DEBUG_FATAL, "Out of Memory in ldb_modules_list_from_string()\n");
 113                         return NULL;
 114                 }
 115
 116         }
 117         modules[i] = modstr;
 118
 119         modules[i + 1] = NULL;
 120
 121         m = (const char **)modules;
 122
 123         return m;
 124 }
 125
 126 static struct backends_list_entry {
 127         struct ldb_backend_ops *ops;
 128         struct backends_list_entry *prev, *next;
 129 } *ldb_backends = NULL;
 130
 131 static struct ops_list_entry {
 132         const struct ldb_module_ops *ops;
 133         struct ops_list_entry *next;
 134 } *registered_modules = NULL;
 135
 136 static const struct ldb_builtins {
 137         const struct ldb_backend_ops *backend_ops;
 138         const struct ldb_module_ops *module_ops;
 139 } builtins[];
 140
 141 static ldb_connect_fn ldb_find_backend(const char *url)
 142 {
 143         struct backends_list_entry *backend;
 144         int i;
 145
 146         for (i = 0; builtins[i].backend_ops || builtins[i].module_ops; i++) {
 147                 if (builtins[i].backend_ops == NULL) continue;
 148
 149                 if (strncmp(builtins[i].backend_ops->name, url,
 150                             strlen(builtins[i].backend_ops->name)) == 0) {
 151                         return builtins[i].backend_ops->connect_fn;
 152                 }
 153         }
 154
 155         for (backend = ldb_backends; backend; backend = backend->next) {
 156                 if (strncmp(backend->ops->name, url,
 157                             strlen(backend->ops->name)) == 0) {
 158                         return backend->ops->connect_fn;
 159                 }
 160         }
 161
 162         return NULL;
 163 }
 164
 165 /*
 166  register a new ldb backend
 167 */
 168 int ldb_register_backend(const char *url_prefix, ldb_connect_fn connectfn)
 169 {
 170         struct ldb_backend_ops *backend;
 171         struct backends_list_entry *entry;
 172
 173         backend = talloc(talloc_autofree_context(), struct ldb_backend_ops);
 174         if (!backend) return LDB_ERR_OPERATIONS_ERROR;
 175
 176         entry = talloc(talloc_autofree_context(), struct backends_list_entry);
 177         if (!entry) {
 178                 talloc_free(backend);
 179                 return LDB_ERR_OPERATIONS_ERROR;
 180         }
 181
 182         if (ldb_find_backend(url_prefix)) {
 183                 return LDB_SUCCESS;
 184         }
 185
 186         /* Maybe check for duplicity here later on? */
 187
 188         backend->name = talloc_strdup(backend, url_prefix);
 189         backend->connect_fn = connectfn;
 190         entry->ops = backend;
 191         DLIST_ADD(ldb_backends, entry);
 192
 193         return LDB_SUCCESS;
 194 }
 195
 196 /*
 197    Return the ldb module form of a database.
 198    The URL can either be one of the following forms
 199    ldb://path
 200    ldapi://path
 201
 202    flags is made up of LDB_FLG_*
 203
 204    the options are passed uninterpreted to the backend, and are
 205    backend specific.
 206
 207    This allows modules to get at only the backend module, for example where a
 208    module may wish to direct certain requests at a particular backend.
 209 */
 210 int ldb_connect_backend(struct ldb_context *ldb,
 211                         const char *url,
 212                         const char *options[],
 213                         struct ldb_module **backend_module)
 214 {
 215         int ret;
 216         char *backend;
 217         ldb_connect_fn fn;
 218
 219         if (strchr(url, ':') != NULL) {
 220                 backend = talloc_strndup(ldb, url, strchr(url, ':')-url);
 221         } else {
 222                 /* Default to tdb */
 223                 backend = talloc_strdup(ldb, "tdb");
 224         }
 225
 226         fn = ldb_find_backend(backend);
 227
 228         if (fn == NULL) {
 229                 struct ldb_backend_ops *ops;
 230                 char *symbol_name = talloc_asprintf(ldb, "ldb_%s_backend_ops", backend);
 231                 if (symbol_name == NULL) {
 232                         return LDB_ERR_OPERATIONS_ERROR;
 233                 }
 234                 ops = ldb_dso_load_symbol(ldb, backend, symbol_name);
 235                 if (ops != NULL) {
 236                         fn = ops->connect_fn;
 237                 }
 238                 talloc_free(symbol_name);
 239         }
 240
 241         talloc_free(backend);
 242
 243         if (fn == NULL) {
 244                 ldb_debug(ldb, LDB_DEBUG_FATAL,
 245                           "Unable to find backend for '%s'\n", url);
 246                 return LDB_ERR_OTHER;
 247         }
 248
 249         ret = fn(ldb, url, ldb->flags, options, backend_module);
 250
 251         if (ret != LDB_SUCCESS) {
 252                 ldb_debug(ldb, LDB_DEBUG_ERROR,
 253                           "Failed to connect to '%s'\n", url);
 254                 return ret;
 255         }
 256         return ret;
 257 }
 258
 259 static const struct ldb_module_ops *ldb_find_module_ops(const char *name)
 260 {
 261         struct ops_list_entry *e;
 262         int i;
 263
 264         for (i = 0; builtins[i].backend_ops || builtins[i].module_ops; i++) {
 265                 if (builtins[i].module_ops == NULL) continue;
 266
 267                 if (strcmp(builtins[i].module_ops->name, name) == 0)
 268                         return builtins[i].module_ops;
 269         }
 270
 271         for (e = registered_modules; e; e = e->next) {
 272                 if (strcmp(e->ops->name, name) == 0)
 273                         return e->ops;
 274         }
 275
 276         return NULL;
 277 }
 278
 279
 280 int ldb_register_module(const struct ldb_module_ops *ops)
 281 {
 282         struct ops_list_entry *entry = talloc(talloc_autofree_context(), struct ops_list_entry);
 283
 284         if (ldb_find_module_ops(ops->name) != NULL)
 285                 return -1;
 286
 287         if (entry == NULL)
 288                 return -1;
 289
 290         entry->ops = ops;
 291         entry->next = registered_modules;
 292         registered_modules = entry;
 293
 294         return 0;
 295 }
 296
 297 static void *ldb_dso_load_symbol(struct ldb_context *ldb, const char *name,
 298                                  const char *symbol)
 299 {
 300         char *path;
 301         void *handle;
 302         void *sym;
 303
 304         if (ldb->modules_dir == NULL)
 305                 return NULL;
 306
 307         path = talloc_asprintf(ldb, "%s/%s.%s", ldb->modules_dir, name,
 308                                SHLIBEXT);
 309
 310         ldb_debug(ldb, LDB_DEBUG_TRACE, "trying to load %s from %s\n", name, path);
 311
 312         handle = dlopen(path, RTLD_NOW);
 313         if (handle == NULL) {
 314                 ldb_debug(ldb, LDB_DEBUG_WARNING, "unable to load %s from %s: %s\n", name, path, dlerror());
 315                 return NULL;
 316         }
 317
 318         sym = (int (*)(void))dlsym(handle, symbol);
 319
 320         if (sym == NULL) {
 321                 ldb_debug(ldb, LDB_DEBUG_ERROR, "no symbol `%s' found in %s: %s\n", symbol, path, dlerror());
 322                 return NULL;
 323         }
 324
 325         talloc_free(path);
 326
 327         return sym;
 328 }
 329
 330 int ldb_load_modules_list(struct ldb_context *ldb, const char **module_list, struct ldb_module *backend, struct ldb_module **out)
 331 {
 332         struct ldb_module *module;
 333         int i;
 334
 335         module = backend;
 336
 337         for (i = 0; module_list[i] != NULL; i++) {
 338                 struct ldb_module *current;
 339                 const struct ldb_module_ops *ops;
 340
 341                 if (strcmp(module_list[i], "") == 0) {
 342                         continue;
 343                 }
 344
 345                 ops = ldb_find_module_ops(module_list[i]);
 346                 if (ops == NULL) {
 347                         char *symbol_name = talloc_asprintf(ldb, "ldb_%s_module_ops",
 348                                                                                                 module_list[i]);
 349                         if (symbol_name == NULL) {
 350                                 return LDB_ERR_OPERATIONS_ERROR;
 351                         }
 352                         ops = ldb_dso_load_symbol(ldb, module_list[i], symbol_name);
 353                         talloc_free(symbol_name);
 354                 }
 355
 356                 if (ops == NULL) {
 357                         ldb_debug(ldb, LDB_DEBUG_WARNING, "WARNING: Module [%s] not found\n",
 358                                   module_list[i]);
 359                         continue;
 360                 }
 361
 362                 current = talloc_zero(ldb, struct ldb_module);
 363                 if (current == NULL) {
 364                         return LDB_ERR_OPERATIONS_ERROR;
 365                 }
 366                 talloc_set_name(current, "ldb_module: %s", module_list[i]);
 367
 368                 current->ldb = ldb;
 369                 current->ops = ops;
 370
 371                 DLIST_ADD(module, current);
 372         }
 373         *out = module;
 374         return LDB_SUCCESS;
 375 }
 376
 377 int ldb_init_module_chain(struct ldb_context *ldb, struct ldb_module *module)
 378 {
 379         while (module && module->ops->init_context == NULL)
 380                 module = module->next;
 381
 382         /* init is different in that it is not an error if modules
 383          * do not require initialization */
 384
 385         if (module) {
 386                 int ret = module->ops->init_context(module);
 387                 if (ret != LDB_SUCCESS) {
 388                         ldb_debug(ldb, LDB_DEBUG_FATAL, "module %s initialization failed\n", module->ops->name);
 389                         return ret;
 390                 }
 391         }
 392
 393         return LDB_SUCCESS;
 394 }
 395
 396 int ldb_load_modules(struct ldb_context *ldb, const char *options[])
 397 {
 398         const char **modules = NULL;
 399         int i;
 400         int ret;
 401         TALLOC_CTX *mem_ctx = talloc_new(ldb);
 402         if (!mem_ctx) {
 403                 return LDB_ERR_OPERATIONS_ERROR;
 404         }
 405
 406         /* find out which modules we are requested to activate */
 407
 408         /* check if we have a custom module list passd as ldb option */
 409         if (options) {
 410                 for (i = 0; options[i] != NULL; i++) {
 411                         if (strncmp(options[i], LDB_MODULE_PREFIX, LDB_MODULE_PREFIX_LEN) == 0) {
 412                                 modules = ldb_modules_list_from_string(ldb, mem_ctx, &options[i][LDB_MODULE_PREFIX_LEN]);
 413                         }
 414                 }
 415         }
 416
 417         /* if not overloaded by options and the backend is not ldap try to load the modules list from ldb */
 418         if ((modules == NULL) && (strcmp("ldap", ldb->modules->ops->name) != 0)) {
 419                 const char * const attrs[] = { "@LIST" , NULL};
 420                 struct ldb_result *res = NULL;
 421                 struct ldb_dn *mods_dn;
 422
 423                 mods_dn = ldb_dn_new(mem_ctx, ldb, "@MODULES");
 424                 if (mods_dn == NULL) {
 425                         talloc_free(mem_ctx);
 426                         return -1;
 427                 }
 428
 429                 ret = ldb_search(ldb, mods_dn, &res, mods_dn, LDB_SCOPE_BASE, attrs, "@LIST=*");
 430
 431                 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 432                         ldb_debug(ldb, LDB_DEBUG_TRACE, "no modules required by the db");
 433                 } else if (ret != LDB_SUCCESS) {
 434                         ldb_debug(ldb, LDB_DEBUG_FATAL, "ldb error (%s) occurred searching for modules, bailing out\n", ldb_errstring(ldb));
 435                         talloc_free(mem_ctx);
 436                         return ret;
 437                 } else {
 438                         const char *module_list;
 439                         if (res->count == 0) {
 440                                 ldb_debug(ldb, LDB_DEBUG_TRACE, "no modules required by the db");
 441                         } else if (res->count > 1) {
 442                                 ldb_debug(ldb, LDB_DEBUG_FATAL, "Too many records found (%d), bailing out\n", res->count);
 443                                 talloc_free(mem_ctx);
 444                                 return -1;
 445                         } else {
 446                                 module_list = ldb_msg_find_attr_as_string(res->msgs[0], "@LIST", NULL);
 447                                 if (!module_list) {
 448                                         ldb_debug(ldb, LDB_DEBUG_TRACE, "no modules required by the db");
 449                                 }
 450                                 modules = ldb_modules_list_from_string(ldb, mem_ctx,
 451                                                                module_list);
 452                         }
 453                 }
 454
 455                 talloc_free(mods_dn);
 456         }
 457
 458         if (modules != NULL) {
 459                 ret = ldb_load_modules_list(ldb, modules, ldb->modules, &ldb->modules);
 460                 if (ret != LDB_SUCCESS) {
 461                         talloc_free(mem_ctx);
 462                         return ret;
 463                 }
 464         } else {
 465                 ldb_debug(ldb, LDB_DEBUG_TRACE, "No modules specified for this database");
 466         }
 467
 468         ret = ldb_init_module_chain(ldb, ldb->modules);
 469         talloc_free(mem_ctx);
 470         return ret;
 471 }
 472
 473 /*
 474   by using this we allow ldb modules to only implement the functions they care about,
 475   which makes writing a module simpler, and makes it more likely to keep working
 476   when ldb is extended
 477 */
 478 #define FIND_OP(module, op) do { \
 479         struct ldb_context *ldb = module->ldb; \
 480         module = module->next; \
 481         while (module && module->ops->op == NULL) module = module->next; \
 482         if (module == NULL) { \
 483                 ldb_asprintf_errstring(ldb, "Unable to find backend operation for " #op ); \
 484                 return LDB_ERR_OPERATIONS_ERROR;        \
 485         }                                               \
 486 } while (0)
 487
 488
 489 struct ldb_module *ldb_module_new(TALLOC_CTX *memctx,
 490                                   struct ldb_context *ldb,
 491                                   const char *module_name,
 492                                   const struct ldb_module_ops *ops)
 493 {
 494         struct ldb_module *module;
 495
 496         module = talloc(memctx, struct ldb_module);
 497         if (!module) {
 498                 ldb_oom(ldb);
 499                 return NULL;
 500         }
 501         talloc_set_name_const(module, module_name);
 502         module->ldb = ldb;
 503         module->prev = module->next = NULL;
 504         module->ops = ops;
 505
 506         return module;
 507 }
 508
 509 const char * ldb_module_get_name(struct ldb_module *module)
 510 {
 511         return module->ops->name;
 512 }
 513
 514 struct ldb_context *ldb_module_get_ctx(struct ldb_module *module)
 515 {
 516         return module->ldb;
 517 }
 518
 519 void *ldb_module_get_private(struct ldb_module *module)
 520 {
 521         return module->private_data;
 522 }
 523
 524 void ldb_module_set_private(struct ldb_module *module, void *private_data)
 525 {
 526         module->private_data = private_data;
 527 }
 528
 529 /*
 530    helper functions to call the next module in chain
 531 */
 532
 533 int ldb_next_request(struct ldb_module *module, struct ldb_request *request)
 534 {
 535         int ret;
 536
 537         if (request->callback == NULL) {
 538                 ldb_set_errstring(module->ldb, "Requests MUST define callbacks");
 539                 return LDB_ERR_UNWILLING_TO_PERFORM;
 540         }
 541
 542         switch (request->operation) {
 543         case LDB_SEARCH:
 544                 FIND_OP(module, search);
 545                 ret = module->ops->search(module, request);
 546                 break;
 547         case LDB_ADD:
 548                 FIND_OP(module, add);
 549                 ret = module->ops->add(module, request);
 550                 break;
 551         case LDB_MODIFY:
 552                 FIND_OP(module, modify);
 553                 ret = module->ops->modify(module, request);
 554                 break;
 555         case LDB_DELETE:
 556                 FIND_OP(module, del);
 557                 ret = module->ops->del(module, request);
 558                 break;
 559         case LDB_RENAME:
 560                 FIND_OP(module, rename);
 561                 ret = module->ops->rename(module, request);
 562                 break;
 563         case LDB_EXTENDED:
 564                 FIND_OP(module, extended);
 565                 ret = module->ops->extended(module, request);
 566                 break;
 567         default:
 568                 FIND_OP(module, request);
 569                 ret = module->ops->request(module, request);
 570                 break;
 571         }
 572         if (ret == LDB_SUCCESS) {
 573                 return ret;
 574         }
 575         if (!ldb_errstring(module->ldb)) {
 576                 /* Set a default error string, to place the blame somewhere */
 577                 ldb_asprintf_errstring(module->ldb, "error in module %s: %s (%d)", module->ops->name, ldb_strerror(ret), ret);
 578         }
 579         return ret;
 580 }
 581
 582 int ldb_next_init(struct ldb_module *module)
 583 {
 584         module = module->next;
 585
 586         return ldb_init_module_chain(module->ldb, module);
 587 }
 588
 589 int ldb_next_start_trans(struct ldb_module *module)
 590 {
 591         FIND_OP(module, start_transaction);
 592         return module->ops->start_transaction(module);
 593 }
 594
 595 int ldb_next_end_trans(struct ldb_module *module)
 596 {
 597         FIND_OP(module, end_transaction);
 598         return module->ops->end_transaction(module);
 599 }
 600
 601 int ldb_next_del_trans(struct ldb_module *module)
 602 {
 603         FIND_OP(module, del_transaction);
 604         return module->ops->del_transaction(module);
 605 }
 606
 607 struct ldb_handle *ldb_handle_new(TALLOC_CTX *mem_ctx, struct ldb_context *ldb)
 608 {
 609         struct ldb_handle *h;
 610
 611         h = talloc_zero(mem_ctx, struct ldb_handle);
 612         if (h == NULL) {
 613                 ldb_set_errstring(ldb, "Out of Memory");
 614                 return NULL;
 615         }
 616
 617         h->status = LDB_SUCCESS;
 618         h->state = LDB_ASYNC_INIT;
 619         h->ldb = ldb;
 620
 621         return h;
 622 }
 623
 624 /* calls the request callback to send an entry
 625  *
 626  * params:
 627  *      req: the original request passed to your module
 628  *      msg: reply message (must be a talloc pointer, and it will be stolen
 629  *           on the ldb_reply that is sent to the callback)
 630  *      ctrls: controls to send in the reply  (must be a talloc pointer, and it will be stolen
 631  *           on the ldb_reply that is sent to the callback)
 632  */
 633
 634 int ldb_module_send_entry(struct ldb_request *req,
 635                           struct ldb_message *msg,
 636                           struct ldb_control **ctrls)
 637 {
 638         struct ldb_reply *ares;
 639
 640         ares = talloc_zero(req, struct ldb_reply);
 641         if (!ares) {
 642                 ldb_oom(req->handle->ldb);
 643                 req->callback(req, NULL);
 644                 return LDB_ERR_OPERATIONS_ERROR;
 645         }
 646         ares->type = LDB_REPLY_ENTRY;
 647         ares->message = talloc_steal(ares, msg);
 648         ares->controls = talloc_steal(ares, ctrls);
 649         ares->error = LDB_SUCCESS;
 650
 651         return req->callback(req, ares);
 652 }
 653
 654 /* calls the request callback to send an referrals
 655  *
 656  * params:
 657  *      req: the original request passed to your module
 658  *      ref: referral string (must be a talloc pointeri, steal)
 659  */
 660
 661 int ldb_module_send_referral(struct ldb_request *req,
 662                                            char *ref)
 663 {
 664         struct ldb_reply *ares;
 665
 666         ares = talloc_zero(req, struct ldb_reply);
 667         if (!ares) {
 668                 ldb_oom(req->handle->ldb);
 669                 req->callback(req, NULL);
 670                 return LDB_ERR_OPERATIONS_ERROR;
 671         }
 672         ares->type = LDB_REPLY_REFERRAL;
 673         ares->referral = talloc_steal(ares, ref);
 674         ares->error = LDB_SUCCESS;
 675
 676         return req->callback(req, ares);
 677 }
 678
 679 /* calls the original request callback
 680  *
 681  * params:
 682  *      req:   the original request passed to your module
 683  *      ctrls: controls to send in the reply (must be a talloc pointer, steal)
 684  *      response: results for extended request (steal)
 685  *      error: LDB_SUCCESS for a succesful return
 686  *             any other ldb error otherwise
 687  */
 688 int ldb_module_done(struct ldb_request *req,
 689                     struct ldb_control **ctrls,
 690                     struct ldb_extended *response,
 691                     int error)
 692 {
 693         struct ldb_reply *ares;
 694
 695         ares = talloc_zero(req, struct ldb_reply);
 696         if (!ares) {
 697                 ldb_oom(req->handle->ldb);
 698                 req->callback(req, NULL);
 699                 return LDB_ERR_OPERATIONS_ERROR;
 700         }
 701         ares->type = LDB_REPLY_DONE;
 702         ares->controls = talloc_steal(ares, ctrls);
 703         ares->response = talloc_steal(ares, response);
 704         ares->error = error;
 705
 706         req->callback(req, ares);
 707         return error;
 708 }
 709
 710 /* to be used *only* in modules init functions.
 711  * this function i synchronous and will register
 712  * the requested OID in the rootdse module if present
 713  * otherwise it will return an error */
 714 int ldb_mod_register_control(struct ldb_module *module, const char *oid)
 715 {
 716         struct ldb_request *req;
 717         int ret;
 718
 719         req = talloc_zero(module, struct ldb_request);
 720         if (req == NULL) {
 721                 return LDB_ERR_OPERATIONS_ERROR;
 722         }
 723
 724         req->operation = LDB_REQ_REGISTER_CONTROL;
 725         req->op.reg_control.oid = oid;
 726         req->callback = ldb_op_default_callback;
 727
 728         ldb_set_timeout(module->ldb, req, 0);
 729
 730         req->handle = ldb_handle_new(req, module->ldb);
 731         if (req->handle == NULL) {
 732                 return LDB_ERR_OPERATIONS_ERROR;
 733         }
 734
 735         ret = ldb_request(module->ldb, req);
 736         if (ret == LDB_SUCCESS) {
 737                 ret = ldb_wait(req->handle, LDB_WAIT_ALL);
 738         }
 739         talloc_free(req);
 740
 741         return ret;
 742 }
 743
 744 #ifndef STATIC_LIBLDB_MODULES
 745
 746 #ifdef HAVE_LDB_LDAP
 747 #define LDAP_BACKEND LDB_BACKEND(ldap), LDB_BACKEND(ldapi), LDB_BACKEND(ldaps),
 748 #else
 749 #define LDAP_BACKEND
 750 #endif
 751
 752 #ifdef HAVE_LDB_SQLITE3
 753 #define SQLITE3_BACKEND LDB_BACKEND(sqlite3),
 754 #else
 755 #define SQLITE3_BACKEND
 756 #endif
 757
 758 #define STATIC_LIBLDB_MODULES \
 759         LDB_BACKEND(tdb),       \
 760         LDAP_BACKEND    \
 761         SQLITE3_BACKEND \
 762         LDB_MODULE(operational),        \
 763         LDB_MODULE(rdn_name),   \
 764         LDB_MODULE(paged_results),      \
 765         LDB_MODULE(server_sort),                \
 766         LDB_MODULE(asq), \
 767         NULL
 768 #endif
 769
 770 /*
 771  * this is a bit hacked, as STATIC_LIBLDB_MODULES contains ','
 772  * between the elements and we want to autogenerate the
 773  * extern struct declarations, so we do some hacks and let the
 774  * ',' appear in an unused function prototype.
 775  */
 776 #undef NULL
 777 #define NULL LDB_MODULE(NULL),
 778
 779 #define LDB_BACKEND(name) \
 780         int); \
 781         extern const struct ldb_backend_ops ldb_ ## name ## _backend_ops;\
 782         extern void ldb_noop ## name (int
 783 #define LDB_MODULE(name) \
 784         int); \
 785         extern const struct ldb_module_ops ldb_ ## name ## _module_ops;\
 786         extern void ldb_noop ## name (int
 787
 788 extern void ldb_start_noop(int,
 789 STATIC_LIBLDB_MODULES
 790 int);
 791
 792 #undef NULL
 793 #define NULL { \
 794         .backend_ops = (void *)0, \
 795         .module_ops = (void *)0 \
 796 }
 797
 798 #undef LDB_BACKEND
 799 #define LDB_BACKEND(name) { \
 800         .backend_ops = &ldb_ ## name ## _backend_ops, \
 801         .module_ops = (void *)0 \
 802 }
 803 #undef LDB_MODULE
 804 #define LDB_MODULE(name) { \
 805         .backend_ops = (void *)0, \
 806         .module_ops = &ldb_ ## name ## _module_ops \
 807 }
 808
 809 static const struct ldb_builtins builtins[] = {
 810         STATIC_LIBLDB_MODULES
 811 };