source4/lib/ldb/common/ldb.c

   1 /*
   2    ldb database library
   3
   4    Copyright (C) Andrew Tridgell  2004
   5    Copyright (C) Simo Sorce  2005-2008
   6
   7      ** NOTE! The following LGPL license applies to the ldb
   8      ** library. This does NOT imply that all of Samba is released
   9      ** under the LGPL
  10
  11    This library is free software; you can redistribute it and/or
  12    modify it under the terms of the GNU Lesser General Public
  13    License as published by the Free Software Foundation; either
  14    version 3 of the License, or (at your option) any later version.
  15
  16    This library is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19    Lesser General Public License for more details.
  20
  21    You should have received a copy of the GNU Lesser General Public
  22    License along with this library; if not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 /*
  26  *  Name: ldb
  27  *
  28  *  Component: ldb core API
  29  *
  30  *  Description: core API routines interfacing to ldb backends
  31  *
  32  *  Author: Andrew Tridgell
  33  */
  34
  35 #define TEVENT_DEPRECATED 1
  36 #include "ldb_private.h"
  37
  38 static int ldb_context_destructor(void *ptr)
  39 {
  40         struct ldb_context *ldb = talloc_get_type(ptr, struct ldb_context);
  41
  42         if (ldb->transaction_active) {
  43                 ldb_debug(ldb, LDB_DEBUG_FATAL,
  44                           "A transaction is still active in ldb context [%p] on %s",
  45                           ldb, (const char *)ldb_get_opaque(ldb, "ldb_url"));
  46         }
  47
  48         return 0;
  49 }
  50
  51 /*
  52   this is used to catch debug messages from events
  53 */
  54 static void ldb_tevent_debug(void *context, enum tevent_debug_level level,
  55                              const char *fmt, va_list ap)  PRINTF_ATTRIBUTE(3,0);
  56
  57 static void ldb_tevent_debug(void *context, enum tevent_debug_level level,
  58                              const char *fmt, va_list ap)
  59 {
  60         struct ldb_context *ldb = talloc_get_type(context, struct ldb_context);
  61         enum ldb_debug_level ldb_level = LDB_DEBUG_FATAL;
  62         char *s = NULL;
  63
  64         switch (level) {
  65         case TEVENT_DEBUG_FATAL:
  66                 ldb_level = LDB_DEBUG_FATAL;
  67                 break;
  68         case TEVENT_DEBUG_ERROR:
  69                 ldb_level = LDB_DEBUG_ERROR;
  70                 break;
  71         case TEVENT_DEBUG_WARNING:
  72                 ldb_level = LDB_DEBUG_WARNING;
  73                 break;
  74         case TEVENT_DEBUG_TRACE:
  75                 ldb_level = LDB_DEBUG_TRACE;
  76                 break;
  77         };
  78
  79         vasprintf(&s, fmt, ap);
  80         if (!s) return;
  81         ldb_debug(ldb, ldb_level, "tevent: %s", s);
  82         free(s);
  83 }
  84
  85 /*
  86    initialise a ldb context
  87    The mem_ctx is required
  88    The event_ctx is required
  89 */
  90 struct ldb_context *ldb_init(TALLOC_CTX *mem_ctx, struct tevent_context *ev_ctx)
  91 {
  92         struct ldb_context *ldb;
  93         int ret;
  94
  95         ldb = talloc_zero(mem_ctx, struct ldb_context);
  96         /* FIXME: Hack a new event context so that CMD line utilities work
  97          * until we have them all converted */
  98         if (ev_ctx == NULL) {
  99                 ev_ctx = tevent_context_init(talloc_autofree_context());
 100                 tevent_set_debug(ev_ctx, ldb_tevent_debug, ldb);
 101                 tevent_loop_allow_nesting(ev_ctx);
 102         }
 103
 104         ret = ldb_setup_wellknown_attributes(ldb);
 105         if (ret != 0) {
 106                 talloc_free(ldb);
 107                 return NULL;
 108         }
 109
 110         ldb_set_utf8_default(ldb);
 111         ldb_set_create_perms(ldb, 0666);
 112         ldb_set_modules_dir(ldb, LDB_MODULESDIR);
 113         ldb_set_event_context(ldb, ev_ctx);
 114
 115         /* TODO: get timeout from options if available there */
 116         ldb->default_timeout = 300; /* set default to 5 minutes */
 117
 118         talloc_set_destructor((TALLOC_CTX *)ldb, ldb_context_destructor);
 119
 120         return ldb;
 121 }
 122
 123 /*
 124   try to autodetect a basedn if none specified. This fixes one of my
 125   pet hates about ldapsearch, which is that you have to get a long,
 126   complex basedn right to make any use of it.
 127 */
 128 void ldb_set_default_dns(struct ldb_context *ldb)
 129 {
 130         TALLOC_CTX *tmp_ctx;
 131         int ret;
 132         struct ldb_result *res;
 133         struct ldb_dn *tmp_dn=NULL;
 134         static const char *attrs[] = {
 135                 "rootDomainNamingContext",
 136                 "configurationNamingContext",
 137                 "schemaNamingContext",
 138                 "defaultNamingContext",
 139                 NULL
 140         };
 141
 142         tmp_ctx = talloc_new(ldb);
 143         ret = ldb_search(ldb, tmp_ctx, &res, ldb_dn_new(tmp_ctx, ldb, NULL),
 144                          LDB_SCOPE_BASE, attrs, "(objectClass=*)");
 145         if (ret != LDB_SUCCESS) {
 146                 talloc_free(tmp_ctx);
 147                 return;
 148         }
 149
 150         if (res->count != 1) {
 151                 talloc_free(tmp_ctx);
 152                 return;
 153         }
 154
 155         if (!ldb_get_opaque(ldb, "rootDomainNamingContext")) {
 156                 tmp_dn = ldb_msg_find_attr_as_dn(ldb, ldb, res->msgs[0],
 157                                                  "rootDomainNamingContext");
 158                 ldb_set_opaque(ldb, "rootDomainNamingContext", tmp_dn);
 159         }
 160
 161         if (!ldb_get_opaque(ldb, "configurationNamingContext")) {
 162                 tmp_dn = ldb_msg_find_attr_as_dn(ldb, ldb, res->msgs[0],
 163                                                  "configurationNamingContext");
 164                 ldb_set_opaque(ldb, "configurationNamingContext", tmp_dn);
 165         }
 166
 167         if (!ldb_get_opaque(ldb, "schemaNamingContext")) {
 168                 tmp_dn = ldb_msg_find_attr_as_dn(ldb, ldb, res->msgs[0],
 169                                                  "schemaNamingContext");
 170                 ldb_set_opaque(ldb, "schemaNamingContext", tmp_dn);
 171         }
 172
 173         if (!ldb_get_opaque(ldb, "defaultNamingContext")) {
 174                 tmp_dn = ldb_msg_find_attr_as_dn(ldb, ldb, res->msgs[0],
 175                                                  "defaultNamingContext");
 176                 ldb_set_opaque(ldb, "defaultNamingContext", tmp_dn);
 177         }
 178
 179         talloc_free(tmp_ctx);
 180 }
 181
 182 struct ldb_dn *ldb_get_root_basedn(struct ldb_context *ldb)
 183 {
 184         void *opaque = ldb_get_opaque(ldb, "rootDomainNamingContext");
 185         return talloc_get_type(opaque, struct ldb_dn);
 186 }
 187
 188 struct ldb_dn *ldb_get_config_basedn(struct ldb_context *ldb)
 189 {
 190         void *opaque = ldb_get_opaque(ldb, "configurationNamingContext");
 191         return talloc_get_type(opaque, struct ldb_dn);
 192 }
 193
 194 struct ldb_dn *ldb_get_schema_basedn(struct ldb_context *ldb)
 195 {
 196         void *opaque = ldb_get_opaque(ldb, "schemaNamingContext");
 197         return talloc_get_type(opaque, struct ldb_dn);
 198 }
 199
 200 struct ldb_dn *ldb_get_default_basedn(struct ldb_context *ldb)
 201 {
 202         void *opaque = ldb_get_opaque(ldb, "defaultNamingContext");
 203         return talloc_get_type(opaque, struct ldb_dn);
 204 }
 205
 206 /*
 207    connect to a database. The URL can either be one of the following forms
 208    ldb://path
 209    ldapi://path
 210
 211    flags is made up of LDB_FLG_*
 212
 213    the options are passed uninterpreted to the backend, and are
 214    backend specific
 215 */
 216 int ldb_connect(struct ldb_context *ldb, const char *url,
 217                 unsigned int flags, const char *options[])
 218 {
 219         int ret;
 220         const char *url2;
 221         /* We seem to need to do this here, or else some utilities don't
 222          * get ldb backends */
 223
 224         ldb->flags = flags;
 225
 226         url2 = talloc_strdup(ldb, url);
 227         if (!url2) {
 228                 ldb_oom(ldb);
 229                 return LDB_ERR_OPERATIONS_ERROR;
 230         }
 231         ret = ldb_set_opaque(ldb, "ldb_url", talloc_strdup(ldb, url2));
 232         if (ret != LDB_SUCCESS) {
 233                 return ret;
 234         }
 235
 236         ret = ldb_connect_backend(ldb, url, options, &ldb->modules);
 237         if (ret != LDB_SUCCESS) {
 238                 return ret;
 239         }
 240
 241         if (ldb_load_modules(ldb, options) != LDB_SUCCESS) {
 242                 ldb_debug(ldb, LDB_DEBUG_FATAL,
 243                           "Unable to load modules for %s: %s",
 244                           url, ldb_errstring(ldb));
 245                 return LDB_ERR_OTHER;
 246         }
 247
 248         /* set the default base dn */
 249         ldb_set_default_dns(ldb);
 250
 251         return LDB_SUCCESS;
 252 }
 253
 254 void ldb_set_errstring(struct ldb_context *ldb, const char *err_string)
 255 {
 256         if (ldb->err_string) {
 257                 talloc_free(ldb->err_string);
 258         }
 259         ldb->err_string = talloc_strdup(ldb, err_string);
 260         if (ldb->flags & LDB_FLG_ENABLE_TRACING) {
 261                 ldb_debug(ldb, LDB_DEBUG_TRACE, "ldb_set_errstring: %s", ldb->err_string);
 262         }
 263 }
 264
 265 void ldb_asprintf_errstring(struct ldb_context *ldb, const char *format, ...)
 266 {
 267         va_list ap;
 268         char *old_string = NULL;
 269
 270         if (ldb->err_string) {
 271                 old_string = ldb->err_string;
 272         }
 273
 274         va_start(ap, format);
 275         ldb->err_string = talloc_vasprintf(ldb, format, ap);
 276         va_end(ap);
 277         talloc_free(old_string);
 278 }
 279
 280 void ldb_reset_err_string(struct ldb_context *ldb)
 281 {
 282         if (ldb->err_string) {
 283                 talloc_free(ldb->err_string);
 284                 ldb->err_string = NULL;
 285         }
 286 }
 287
 288 #define FIRST_OP_NOERR(ldb, op) do { \
 289         module = ldb->modules;                                  \
 290         while (module && module->ops->op == NULL) module = module->next; \
 291 } while (0)
 292
 293 #define FIRST_OP(ldb, op) do { \
 294         FIRST_OP_NOERR(ldb, op); \
 295         if (module == NULL) {                                   \
 296                 ldb_asprintf_errstring(ldb, "unable to find module or backend to handle operation: " #op); \
 297                 return LDB_ERR_OPERATIONS_ERROR;                        \
 298         } \
 299 } while (0)
 300
 301
 302 /*
 303   start a transaction
 304 */
 305 int ldb_transaction_start(struct ldb_context *ldb)
 306 {
 307         struct ldb_module *module;
 308         int status;
 309
 310         ldb_debug(ldb, LDB_DEBUG_TRACE,
 311                   "start ldb transaction (nesting: %d)",
 312                   ldb->transaction_active);
 313
 314         /* explicit transaction active, count nested requests */
 315         if (ldb->transaction_active) {
 316                 ldb->transaction_active++;
 317                 return LDB_SUCCESS;
 318         }
 319
 320         /* start a new transaction */
 321         ldb->transaction_active++;
 322         ldb->prepare_commit_done = false;
 323
 324         FIRST_OP(ldb, start_transaction);
 325
 326         ldb_reset_err_string(ldb);
 327
 328         status = module->ops->start_transaction(module);
 329         if (status != LDB_SUCCESS) {
 330                 if (ldb->err_string == NULL) {
 331                         /* no error string was setup by the backend */
 332                         ldb_asprintf_errstring(ldb,
 333                                 "ldb transaction start: %s (%d)",
 334                                 ldb_strerror(status),
 335                                 status);
 336                 }
 337         }
 338         return status;
 339 }
 340
 341 /*
 342   prepare for transaction commit (first phase of two phase commit)
 343 */
 344 int ldb_transaction_prepare_commit(struct ldb_context *ldb)
 345 {
 346         struct ldb_module *module;
 347         int status;
 348
 349         if (ldb->prepare_commit_done) {
 350                 return LDB_SUCCESS;
 351         }
 352
 353         /* commit only when all nested transactions are complete */
 354         if (ldb->transaction_active > 1) {
 355                 return LDB_SUCCESS;
 356         }
 357
 358         ldb->prepare_commit_done = true;
 359
 360         if (ldb->transaction_active < 0) {
 361                 ldb_debug(ldb, LDB_DEBUG_FATAL,
 362                           "prepare commit called but no ldb transactions are active!");
 363                 ldb->transaction_active = 0;
 364                 return LDB_ERR_OPERATIONS_ERROR;
 365         }
 366
 367         /* call prepare transaction if available */
 368         FIRST_OP_NOERR(ldb, prepare_commit);
 369         if (module == NULL) {
 370                 return LDB_SUCCESS;
 371         }
 372
 373         status = module->ops->prepare_commit(module);
 374         if (status != LDB_SUCCESS) {
 375                 /* if a module fails the prepare then we need
 376                    to call the end transaction for everyone */
 377                 FIRST_OP(ldb, end_transaction);
 378                 module->ops->end_transaction(module);
 379                 if (ldb->err_string == NULL) {
 380                         /* no error string was setup by the backend */
 381                         ldb_asprintf_errstring(ldb,
 382                                                "ldb transaction prepare commit: %s (%d)",
 383                                                ldb_strerror(status),
 384                                                status);
 385                 }
 386         }
 387
 388         return status;
 389 }
 390
 391
 392 /*
 393   commit a transaction
 394 */
 395 int ldb_transaction_commit(struct ldb_context *ldb)
 396 {
 397         struct ldb_module *module;
 398         int status;
 399
 400         status = ldb_transaction_prepare_commit(ldb);
 401         if (status != LDB_SUCCESS) {
 402                 return status;
 403         }
 404
 405         ldb->transaction_active--;
 406
 407         ldb_debug(ldb, LDB_DEBUG_TRACE,
 408                   "commit ldb transaction (nesting: %d)",
 409                   ldb->transaction_active);
 410
 411         /* commit only when all nested transactions are complete */
 412         if (ldb->transaction_active > 0) {
 413                 return LDB_SUCCESS;
 414         }
 415
 416         if (ldb->transaction_active < 0) {
 417                 ldb_debug(ldb, LDB_DEBUG_FATAL,
 418                           "commit called but no ldb transactions are active!");
 419                 ldb->transaction_active = 0;
 420                 return LDB_ERR_OPERATIONS_ERROR;
 421         }
 422
 423         ldb_reset_err_string(ldb);
 424
 425         FIRST_OP(ldb, end_transaction);
 426         status = module->ops->end_transaction(module);
 427         if (status != LDB_SUCCESS) {
 428                 if (ldb->err_string == NULL) {
 429                         /* no error string was setup by the backend */
 430                         ldb_asprintf_errstring(ldb,
 431                                 "ldb transaction commit: %s (%d)",
 432                                 ldb_strerror(status),
 433                                 status);
 434                 }
 435                 /* cancel the transaction */
 436                 FIRST_OP(ldb, del_transaction);
 437                 module->ops->del_transaction(module);
 438         }
 439         return status;
 440 }
 441
 442
 443 /*
 444   cancel a transaction
 445 */
 446 int ldb_transaction_cancel(struct ldb_context *ldb)
 447 {
 448         struct ldb_module *module;
 449         int status;
 450
 451         ldb->transaction_active--;
 452
 453         ldb_debug(ldb, LDB_DEBUG_TRACE,
 454                   "cancel ldb transaction (nesting: %d)",
 455                   ldb->transaction_active);
 456
 457         /* really cancel only if all nested transactions are complete */
 458         if (ldb->transaction_active > 0) {
 459                 return LDB_SUCCESS;
 460         }
 461
 462         if (ldb->transaction_active < 0) {
 463                 ldb_debug(ldb, LDB_DEBUG_FATAL,
 464                           "cancel called but no ldb transactions are active!");
 465                 ldb->transaction_active = 0;
 466                 return LDB_ERR_OPERATIONS_ERROR;
 467         }
 468
 469         FIRST_OP(ldb, del_transaction);
 470
 471         status = module->ops->del_transaction(module);
 472         if (status != LDB_SUCCESS) {
 473                 if (ldb->err_string == NULL) {
 474                         /* no error string was setup by the backend */
 475                         ldb_asprintf_errstring(ldb,
 476                                 "ldb transaction cancel: %s (%d)",
 477                                 ldb_strerror(status),
 478                                 status);
 479                 }
 480         }
 481         return status;
 482 }
 483
 484 /* autostarts a transacion if none active */
 485 static int ldb_autotransaction_request(struct ldb_context *ldb,
 486                                        struct ldb_request *req)
 487 {
 488         int ret;
 489
 490         ret = ldb_transaction_start(ldb);
 491         if (ret != LDB_SUCCESS) {
 492                 return ret;
 493         }
 494
 495         ret = ldb_request(ldb, req);
 496         if (ret == LDB_SUCCESS) {
 497                 ret = ldb_wait(req->handle, LDB_WAIT_ALL);
 498         }
 499
 500         if (ret == LDB_SUCCESS) {
 501                 return ldb_transaction_commit(ldb);
 502         }
 503         ldb_transaction_cancel(ldb);
 504
 505         if (ldb->err_string == NULL) {
 506                 /* no error string was setup by the backend */
 507                 ldb_asprintf_errstring(ldb, "%s (%d)", ldb_strerror(ret), ret);
 508         }
 509
 510         return ret;
 511 }
 512
 513 int ldb_wait(struct ldb_handle *handle, enum ldb_wait_type type)
 514 {
 515         struct tevent_context *ev;
 516         int ret;
 517
 518         if (!handle) {
 519                 return LDB_ERR_UNAVAILABLE;
 520         }
 521
 522         if (handle->state == LDB_ASYNC_DONE) {
 523                 return handle->status;
 524         }
 525
 526         ev = ldb_get_event_context(handle->ldb);
 527         if (NULL == ev) {
 528                 return LDB_ERR_OPERATIONS_ERROR;
 529         }
 530
 531         switch (type) {
 532         case LDB_WAIT_NONE:
 533                 ret = tevent_loop_once(ev);
 534                 if (ret != 0) {
 535                         return LDB_ERR_OPERATIONS_ERROR;
 536                 }
 537                 if (handle->state == LDB_ASYNC_DONE ||
 538                     handle->status != LDB_SUCCESS) {
 539                         return handle->status;
 540                 }
 541                 break;
 542
 543         case LDB_WAIT_ALL:
 544                 while (handle->state != LDB_ASYNC_DONE) {
 545                         ret = tevent_loop_once(ev);
 546                         if (ret != 0) {
 547                                 return LDB_ERR_OPERATIONS_ERROR;
 548                         }
 549                         if (handle->status != LDB_SUCCESS) {
 550                                 return handle->status;
 551                         }
 552                 }
 553                 return handle->status;
 554         }
 555
 556         return LDB_SUCCESS;
 557 }
 558
 559 /* set the specified timeout or, if timeout is 0 set the default timeout */
 560 int ldb_set_timeout(struct ldb_context *ldb,
 561                     struct ldb_request *req,
 562                     int timeout)
 563 {
 564         if (req == NULL) return LDB_ERR_OPERATIONS_ERROR;
 565
 566         if (timeout != 0) {
 567                 req->timeout = timeout;
 568         } else {
 569                 req->timeout = ldb->default_timeout;
 570         }
 571         req->starttime = time(NULL);
 572
 573         return LDB_SUCCESS;
 574 }
 575
 576 /* calculates the new timeout based on the previous starttime and timeout */
 577 int ldb_set_timeout_from_prev_req(struct ldb_context *ldb,
 578                                   struct ldb_request *oldreq,
 579                                   struct ldb_request *newreq)
 580 {
 581         if (newreq == NULL) return LDB_ERR_OPERATIONS_ERROR;
 582
 583         if (oldreq == NULL) {
 584                 return ldb_set_timeout(ldb, newreq, 0);
 585         }
 586
 587         newreq->starttime = oldreq->starttime;
 588         newreq->timeout = oldreq->timeout;
 589
 590         return LDB_SUCCESS;
 591 }
 592
 593
 594 /*
 595    set the permissions for new files to be passed to open() in
 596    backends that use local files
 597  */
 598 void ldb_set_create_perms(struct ldb_context *ldb, unsigned int perms)
 599 {
 600         ldb->create_perms = perms;
 601 }
 602
 603 unsigned int ldb_get_create_perms(struct ldb_context *ldb)
 604 {
 605         return ldb->create_perms;
 606 }
 607
 608 void ldb_set_event_context(struct ldb_context *ldb, struct tevent_context *ev)
 609 {
 610         ldb->ev_ctx = ev;
 611 }
 612
 613 struct tevent_context * ldb_get_event_context(struct ldb_context *ldb)
 614 {
 615         return ldb->ev_ctx;
 616 }
 617
 618 void ldb_request_set_state(struct ldb_request *req, int state)
 619 {
 620         req->handle->state = state;
 621 }
 622
 623 int ldb_request_get_status(struct ldb_request *req)
 624 {
 625         return req->handle->status;
 626 }
 627
 628
 629 /*
 630   trace a ldb request
 631 */
 632 static void ldb_trace_request(struct ldb_context *ldb, struct ldb_request *req)
 633 {
 634         TALLOC_CTX *tmp_ctx = talloc_new(req);
 635         int i;
 636
 637         switch (req->operation) {
 638         case LDB_SEARCH:
 639                 ldb_debug_add(ldb, "ldb_trace_request: SEARCH\n");
 640                 ldb_debug_add(ldb, " dn: %s\n",
 641                               ldb_dn_is_null(req->op.search.base)?"<rootDSE>":
 642                               ldb_dn_get_linearized(req->op.search.base));
 643                 ldb_debug_add(ldb, " scope: %s\n",
 644                           req->op.search.scope==LDB_SCOPE_BASE?"base":
 645                           req->op.search.scope==LDB_SCOPE_ONELEVEL?"one":
 646                           req->op.search.scope==LDB_SCOPE_SUBTREE?"sub":"UNKNOWN");
 647                 ldb_debug_add(ldb, " expr: %s\n",
 648                           ldb_filter_from_tree(tmp_ctx, req->op.search.tree));
 649                 if (req->op.search.attrs == NULL) {
 650                         ldb_debug_add(ldb, " attr: <ALL>\n");
 651                 } else {
 652                         for (i=0; req->op.search.attrs[i]; i++) {
 653                                 ldb_debug_add(ldb, " attr: %s\n", req->op.search.attrs[i]);
 654                         }
 655                 }
 656                 break;
 657         case LDB_DELETE:
 658                 ldb_debug_add(ldb, "ldb_trace_request: DELETE\n");
 659                 ldb_debug_add(ldb, " dn: %s\n",
 660                               ldb_dn_get_linearized(req->op.del.dn));
 661                 break;
 662         case LDB_RENAME:
 663                 ldb_debug_add(ldb, "ldb_trace_request: RENAME\n");
 664                 ldb_debug_add(ldb, " olddn: %s\n",
 665                               ldb_dn_get_linearized(req->op.rename.olddn));
 666                 ldb_debug_add(ldb, " newdn: %s\n",
 667                               ldb_dn_get_linearized(req->op.rename.newdn));
 668                 break;
 669         case LDB_EXTENDED:
 670                 ldb_debug_add(ldb, "ldb_trace_request: EXTENDED\n");
 671                 ldb_debug_add(ldb, " oid: %s\n", req->op.extended.oid);
 672                 ldb_debug_add(ldb, " data: %s\n", req->op.extended.data?"yes":"no");
 673                 break;
 674         case LDB_ADD:
 675                 ldb_debug_add(ldb, "ldb_trace_request: ADD\n");
 676                 ldb_debug_add(req->handle->ldb, "%s\n",
 677                               ldb_ldif_message_string(req->handle->ldb, tmp_ctx,
 678                                                       LDB_CHANGETYPE_ADD,
 679                                                       req->op.add.message));
 680                 break;
 681         case LDB_MODIFY:
 682                 ldb_debug_add(ldb, "ldb_trace_request: MODIFY\n");
 683                 ldb_debug_add(req->handle->ldb, "%s\n",
 684                               ldb_ldif_message_string(req->handle->ldb, tmp_ctx,
 685                                                       LDB_CHANGETYPE_ADD,
 686                                                       req->op.mod.message));
 687                 break;
 688         case LDB_REQ_REGISTER_CONTROL:
 689                 ldb_debug_add(ldb, "ldb_trace_request: REGISTER_CONTROL\n");
 690                 ldb_debug_add(req->handle->ldb, "%s\n",
 691                               req->op.reg_control.oid);
 692                 break;
 693         case LDB_REQ_REGISTER_PARTITION:
 694                 ldb_debug_add(ldb, "ldb_trace_request: REGISTER_PARTITION\n");
 695                 ldb_debug_add(req->handle->ldb, "%s\n",
 696                               ldb_dn_get_linearized(req->op.reg_partition.dn));
 697                 break;
 698         default:
 699                 ldb_debug_add(ldb, "ldb_trace_request: UNKNOWN(%u)\n",
 700                               req->operation);
 701                 break;
 702         }
 703
 704         if (req->controls == NULL) {
 705                 ldb_debug_add(ldb, " control: <NONE>\n");
 706         } else {
 707                 for (i=0; req->controls && req->controls[i]; i++) {
 708                         ldb_debug_add(ldb, " control: %s  crit:%u  data:%s\n",
 709                                       req->controls[i]->oid,
 710                                       req->controls[i]->critical,
 711                                       req->controls[i]->data?"yes":"no");
 712                 }
 713         }
 714
 715         ldb_debug_end(ldb, LDB_DEBUG_TRACE);
 716
 717         talloc_free(tmp_ctx);
 718 }
 719
 720
 721 /*
 722   start an ldb request
 723   NOTE: the request must be a talloc context.
 724   returns LDB_ERR_* on errors.
 725 */
 726 int ldb_request(struct ldb_context *ldb, struct ldb_request *req)
 727 {
 728         struct ldb_module *module;
 729         int ret;
 730
 731         if (req->callback == NULL) {
 732                 ldb_set_errstring(ldb, "Requests MUST define callbacks");
 733                 return LDB_ERR_UNWILLING_TO_PERFORM;
 734         }
 735
 736         ldb_reset_err_string(ldb);
 737
 738         if (ldb->flags & LDB_FLG_ENABLE_TRACING) {
 739                 ldb_trace_request(ldb, req);
 740         }
 741
 742         /* call the first module in the chain */
 743         switch (req->operation) {
 744         case LDB_SEARCH:
 745                 FIRST_OP(ldb, search);
 746                 ret = module->ops->search(module, req);
 747                 break;
 748         case LDB_ADD:
 749                 FIRST_OP(ldb, add);
 750                 ret = module->ops->add(module, req);
 751                 break;
 752         case LDB_MODIFY:
 753                 FIRST_OP(ldb, modify);
 754                 ret = module->ops->modify(module, req);
 755                 break;
 756         case LDB_DELETE:
 757                 FIRST_OP(ldb, del);
 758                 ret = module->ops->del(module, req);
 759                 break;
 760         case LDB_RENAME:
 761                 FIRST_OP(ldb, rename);
 762                 ret = module->ops->rename(module, req);
 763                 break;
 764         case LDB_EXTENDED:
 765                 FIRST_OP(ldb, extended);
 766                 ret = module->ops->extended(module, req);
 767                 break;
 768         default:
 769                 FIRST_OP(ldb, request);
 770                 ret = module->ops->request(module, req);
 771                 break;
 772         }
 773
 774         return ret;
 775 }
 776
 777 int ldb_request_done(struct ldb_request *req, int status)
 778 {
 779         req->handle->state = LDB_ASYNC_DONE;
 780         req->handle->status = status;
 781         return status;
 782 }
 783
 784 /*
 785   search the database given a LDAP-like search expression
 786
 787   returns an LDB error code
 788
 789   Use talloc_free to free the ldb_message returned in 'res', if successful
 790
 791 */
 792 int ldb_search_default_callback(struct ldb_request *req,
 793                                 struct ldb_reply *ares)
 794 {
 795         struct ldb_result *res;
 796         int n;
 797
 798         res = talloc_get_type(req->context, struct ldb_result);
 799
 800         if (!ares) {
 801                 return ldb_request_done(req, LDB_ERR_OPERATIONS_ERROR);
 802         }
 803         if (ares->error != LDB_SUCCESS) {
 804                 return ldb_request_done(req, ares->error);
 805         }
 806
 807         switch (ares->type) {
 808         case LDB_REPLY_ENTRY:
 809                 res->msgs = talloc_realloc(res, res->msgs,
 810                                         struct ldb_message *, res->count + 2);
 811                 if (! res->msgs) {
 812                         return ldb_request_done(req, LDB_ERR_OPERATIONS_ERROR);
 813                 }
 814
 815                 res->msgs[res->count + 1] = NULL;
 816
 817                 res->msgs[res->count] = talloc_move(res->msgs, &ares->message);
 818                 res->count++;
 819                 break;
 820
 821         case LDB_REPLY_REFERRAL:
 822                 if (res->refs) {
 823                         for (n = 0; res->refs[n]; n++) /*noop*/ ;
 824                 } else {
 825                         n = 0;
 826                 }
 827
 828                 res->refs = talloc_realloc(res, res->refs, char *, n + 2);
 829                 if (! res->refs) {
 830                         return ldb_request_done(req, LDB_ERR_OPERATIONS_ERROR);
 831                 }
 832
 833                 res->refs[n] = talloc_move(res->refs, &ares->referral);
 834                 res->refs[n + 1] = NULL;
 835                 break;
 836
 837         case LDB_REPLY_DONE:
 838                 /* TODO: we should really support controls on entries
 839                  * and referrals too! */
 840                 res->controls = talloc_move(res, &ares->controls);
 841
 842                 /* this is the last message, and means the request is done */
 843                 /* we have to signal and eventual ldb_wait() waiting that the
 844                  * async request operation was completed */
 845                 talloc_free(ares);
 846                 return ldb_request_done(req, LDB_SUCCESS);
 847         }
 848
 849         talloc_free(ares);
 850
 851         return LDB_SUCCESS;
 852 }
 853
 854 int ldb_op_default_callback(struct ldb_request *req, struct ldb_reply *ares)
 855 {
 856         int ret;
 857
 858         if (!ares) {
 859                 return ldb_request_done(req, LDB_ERR_OPERATIONS_ERROR);
 860         }
 861
 862         if (ares->error != LDB_SUCCESS) {
 863                 ret = ares->error;
 864                 talloc_free(ares);
 865                 return ldb_request_done(req, ret);
 866         }
 867
 868         if (ares->type != LDB_REPLY_DONE) {
 869                 talloc_free(ares);
 870                 ldb_set_errstring(req->handle->ldb, "Invalid reply type!");
 871                 return ldb_request_done(req, LDB_ERR_OPERATIONS_ERROR);
 872         }
 873
 874         talloc_free(ares);
 875         return ldb_request_done(req, LDB_SUCCESS);
 876 }
 877
 878 int ldb_build_search_req_ex(struct ldb_request **ret_req,
 879                         struct ldb_context *ldb,
 880                         void *mem_ctx,
 881                         struct ldb_dn *base,
 882                         enum ldb_scope scope,
 883                         struct ldb_parse_tree *tree,
 884                         const char * const *attrs,
 885                         struct ldb_control **controls,
 886                         void *context,
 887                         ldb_request_callback_t callback,
 888                         struct ldb_request *parent)
 889 {
 890         struct ldb_request *req;
 891
 892         *ret_req = NULL;
 893
 894         req = talloc(mem_ctx, struct ldb_request);
 895         if (req == NULL) {
 896                 ldb_oom(ldb);
 897                 return LDB_ERR_OPERATIONS_ERROR;
 898         }
 899
 900         req->operation = LDB_SEARCH;
 901         if (base == NULL) {
 902                 req->op.search.base = ldb_dn_new(req, ldb, NULL);
 903         } else {
 904                 req->op.search.base = base;
 905         }
 906         req->op.search.scope = scope;
 907
 908         req->op.search.tree = tree;
 909         if (req->op.search.tree == NULL) {
 910                 ldb_set_errstring(ldb, "'tree' can't be NULL");
 911                 talloc_free(req);
 912                 return LDB_ERR_OPERATIONS_ERROR;
 913         }
 914
 915         req->op.search.attrs = attrs;
 916         req->controls = controls;
 917         req->context = context;
 918         req->callback = callback;
 919
 920         ldb_set_timeout_from_prev_req(ldb, parent, req);
 921
 922         req->handle = ldb_handle_new(req, ldb);
 923         if (req->handle == NULL) {
 924                 ldb_oom(ldb);
 925                 return LDB_ERR_OPERATIONS_ERROR;
 926         }
 927
 928         if (parent) {
 929                 req->handle->nesting++;
 930         }
 931
 932         *ret_req = req;
 933         return LDB_SUCCESS;
 934 }
 935
 936 int ldb_build_search_req(struct ldb_request **ret_req,
 937                         struct ldb_context *ldb,
 938                         void *mem_ctx,
 939                         struct ldb_dn *base,
 940                         enum ldb_scope scope,
 941                         const char *expression,
 942                         const char * const *attrs,
 943                         struct ldb_control **controls,
 944                         void *context,
 945                         ldb_request_callback_t callback,
 946                         struct ldb_request *parent)
 947 {
 948         struct ldb_parse_tree *tree;
 949         int ret;
 950
 951         tree = ldb_parse_tree(mem_ctx, expression);
 952         if (tree == NULL) {
 953                 ldb_set_errstring(ldb, "Unable to parse search expression");
 954                 return LDB_ERR_OPERATIONS_ERROR;
 955         }
 956
 957         ret = ldb_build_search_req_ex(ret_req, ldb, mem_ctx, base,
 958                                       scope, tree, attrs, controls,
 959                                       context, callback, parent);
 960         if (ret == LDB_SUCCESS) {
 961                 talloc_steal(*ret_req, tree);
 962         }
 963         return ret;
 964 }
 965
 966 int ldb_build_add_req(struct ldb_request **ret_req,
 967                         struct ldb_context *ldb,
 968                         void *mem_ctx,
 969                         const struct ldb_message *message,
 970                         struct ldb_control **controls,
 971                         void *context,
 972                         ldb_request_callback_t callback,
 973                         struct ldb_request *parent)
 974 {
 975         struct ldb_request *req;
 976
 977         *ret_req = NULL;
 978
 979         req = talloc(mem_ctx, struct ldb_request);
 980         if (req == NULL) {
 981                 ldb_set_errstring(ldb, "Out of Memory");
 982                 return LDB_ERR_OPERATIONS_ERROR;
 983         }
 984
 985         req->operation = LDB_ADD;
 986         req->op.add.message = message;
 987         req->controls = controls;
 988         req->context = context;
 989         req->callback = callback;
 990
 991         ldb_set_timeout_from_prev_req(ldb, parent, req);
 992
 993         req->handle = ldb_handle_new(req, ldb);
 994         if (req->handle == NULL) {
 995                 ldb_oom(ldb);
 996                 return LDB_ERR_OPERATIONS_ERROR;
 997         }
 998
 999         if (parent) {
1000                 req->handle->nesting++;
1001         }
1002
1003         *ret_req = req;
1004
1005         return LDB_SUCCESS;
1006 }
1007
1008 int ldb_build_mod_req(struct ldb_request **ret_req,
1009                         struct ldb_context *ldb,
1010                         void *mem_ctx,
1011                         const struct ldb_message *message,
1012                         struct ldb_control **controls,
1013                         void *context,
1014                         ldb_request_callback_t callback,
1015                         struct ldb_request *parent)
1016 {
1017         struct ldb_request *req;
1018
1019         *ret_req = NULL;
1020
1021         req = talloc(mem_ctx, struct ldb_request);
1022         if (req == NULL) {
1023                 ldb_set_errstring(ldb, "Out of Memory");
1024                 return LDB_ERR_OPERATIONS_ERROR;
1025         }
1026
1027         req->operation = LDB_MODIFY;
1028         req->op.mod.message = message;
1029         req->controls = controls;
1030         req->context = context;
1031         req->callback = callback;
1032
1033         ldb_set_timeout_from_prev_req(ldb, parent, req);
1034
1035         req->handle = ldb_handle_new(req, ldb);
1036         if (req->handle == NULL) {
1037                 ldb_oom(ldb);
1038                 return LDB_ERR_OPERATIONS_ERROR;
1039         }
1040
1041         if (parent) {
1042                 req->handle->nesting++;
1043         }
1044
1045         *ret_req = req;
1046
1047         return LDB_SUCCESS;
1048 }
1049
1050 int ldb_build_del_req(struct ldb_request **ret_req,
1051                         struct ldb_context *ldb,
1052                         void *mem_ctx,
1053                         struct ldb_dn *dn,
1054                         struct ldb_control **controls,
1055                         void *context,
1056                         ldb_request_callback_t callback,
1057                         struct ldb_request *parent)
1058 {
1059         struct ldb_request *req;
1060
1061         *ret_req = NULL;
1062
1063         req = talloc(mem_ctx, struct ldb_request);
1064         if (req == NULL) {
1065                 ldb_set_errstring(ldb, "Out of Memory");
1066                 return LDB_ERR_OPERATIONS_ERROR;
1067         }
1068
1069         req->operation = LDB_DELETE;
1070         req->op.del.dn = dn;
1071         req->controls = controls;
1072         req->context = context;
1073         req->callback = callback;
1074
1075         ldb_set_timeout_from_prev_req(ldb, parent, req);
1076
1077         req->handle = ldb_handle_new(req, ldb);
1078         if (req->handle == NULL) {
1079                 ldb_oom(ldb);
1080                 return LDB_ERR_OPERATIONS_ERROR;
1081         }
1082
1083         if (parent) {
1084                 req->handle->nesting++;
1085         }
1086
1087         *ret_req = req;
1088
1089         return LDB_SUCCESS;
1090 }
1091
1092 int ldb_build_rename_req(struct ldb_request **ret_req,
1093                         struct ldb_context *ldb,
1094                         void *mem_ctx,
1095                         struct ldb_dn *olddn,
1096                         struct ldb_dn *newdn,
1097                         struct ldb_control **controls,
1098                         void *context,
1099                         ldb_request_callback_t callback,
1100                         struct ldb_request *parent)
1101 {
1102         struct ldb_request *req;
1103
1104         *ret_req = NULL;
1105
1106         req = talloc(mem_ctx, struct ldb_request);
1107         if (req == NULL) {
1108                 ldb_set_errstring(ldb, "Out of Memory");
1109                 return LDB_ERR_OPERATIONS_ERROR;
1110         }
1111
1112         req->operation = LDB_RENAME;
1113         req->op.rename.olddn = olddn;
1114         req->op.rename.newdn = newdn;
1115         req->controls = controls;
1116         req->context = context;
1117         req->callback = callback;
1118
1119         ldb_set_timeout_from_prev_req(ldb, parent, req);
1120
1121         req->handle = ldb_handle_new(req, ldb);
1122         if (req->handle == NULL) {
1123                 ldb_oom(ldb);
1124                 return LDB_ERR_OPERATIONS_ERROR;
1125         }
1126
1127         if (parent) {
1128                 req->handle->nesting++;
1129         }
1130
1131         *ret_req = req;
1132
1133         return LDB_SUCCESS;
1134 }
1135
1136 int ldb_extended_default_callback(struct ldb_request *req,
1137                                   struct ldb_reply *ares)
1138 {
1139         struct ldb_result *res;
1140
1141         res = talloc_get_type(req->context, struct ldb_result);
1142
1143         if (!ares) {
1144                 return ldb_request_done(req, LDB_ERR_OPERATIONS_ERROR);
1145         }
1146         if (ares->error != LDB_SUCCESS) {
1147                 return ldb_request_done(req, ares->error);
1148         }
1149
1150         if (ares->type == LDB_REPLY_DONE) {
1151
1152                 /* TODO: we should really support controls on entries and referrals too! */
1153                 res->extended = talloc_move(res, &ares->response);
1154                 res->controls = talloc_move(res, &ares->controls);
1155
1156                 talloc_free(ares);
1157                 return ldb_request_done(req, LDB_SUCCESS);
1158         }
1159
1160         talloc_free(ares);
1161         ldb_set_errstring(req->handle->ldb, "Invalid reply type!");
1162         return ldb_request_done(req, LDB_ERR_OPERATIONS_ERROR);
1163 }
1164
1165 int ldb_build_extended_req(struct ldb_request **ret_req,
1166                            struct ldb_context *ldb,
1167                            void *mem_ctx,
1168                            const char *oid,
1169                            void *data,
1170                            struct ldb_control **controls,
1171                            void *context,
1172                            ldb_request_callback_t callback,
1173                            struct ldb_request *parent)
1174 {
1175         struct ldb_request *req;
1176
1177         *ret_req = NULL;
1178
1179         req = talloc(mem_ctx, struct ldb_request);
1180         if (req == NULL) {
1181                 ldb_set_errstring(ldb, "Out of Memory");
1182                 return LDB_ERR_OPERATIONS_ERROR;
1183         }
1184
1185         req->operation = LDB_EXTENDED;
1186         req->op.extended.oid = oid;
1187         req->op.extended.data = data;
1188         req->controls = controls;
1189         req->context = context;
1190         req->callback = callback;
1191
1192         ldb_set_timeout_from_prev_req(ldb, parent, req);
1193
1194         req->handle = ldb_handle_new(req, ldb);
1195         if (req->handle == NULL) {
1196                 ldb_oom(ldb);
1197                 return LDB_ERR_OPERATIONS_ERROR;
1198         }
1199
1200         if (parent) {
1201                 req->handle->nesting++;
1202         }
1203
1204         *ret_req = req;
1205
1206         return LDB_SUCCESS;
1207 }
1208
1209 int ldb_extended(struct ldb_context *ldb,
1210                  const char *oid,
1211                  void *data,
1212                  struct ldb_result **_res)
1213 {
1214         struct ldb_request *req;
1215         int ret;
1216         struct ldb_result *res;
1217
1218         *_res = NULL;
1219
1220         res = talloc_zero(ldb, struct ldb_result);
1221         if (!res) {
1222                 return LDB_ERR_OPERATIONS_ERROR;
1223         }
1224
1225         ret = ldb_build_extended_req(&req, ldb, ldb,
1226                                      oid, data, NULL,
1227                                      res, ldb_extended_default_callback,
1228                                      NULL);
1229         if (ret != LDB_SUCCESS) goto done;
1230
1231         ldb_set_timeout(ldb, req, 0); /* use default timeout */
1232
1233         ret = ldb_request(ldb, req);
1234
1235         if (ret == LDB_SUCCESS) {
1236                 ret = ldb_wait(req->handle, LDB_WAIT_ALL);
1237         }
1238
1239         talloc_free(req);
1240
1241 done:
1242         if (ret != LDB_SUCCESS) {
1243                 talloc_free(res);
1244         }
1245
1246         *_res = res;
1247         return ret;
1248 }
1249
1250 /*
1251   note that ldb_search() will automatically replace a NULL 'base' value
1252   with the defaultNamingContext from the rootDSE if available.
1253 */
1254 int ldb_search(struct ldb_context *ldb, TALLOC_CTX *mem_ctx,
1255                 struct ldb_result **result, struct ldb_dn *base,
1256                 enum ldb_scope scope, const char * const *attrs,
1257                 const char *exp_fmt, ...)
1258 {
1259         struct ldb_request *req;
1260         struct ldb_result *res;
1261         char *expression;
1262         va_list ap;
1263         int ret;
1264
1265         expression = NULL;
1266         *result = NULL;
1267         req = NULL;
1268
1269         res = talloc_zero(mem_ctx, struct ldb_result);
1270         if (!res) {
1271                 return LDB_ERR_OPERATIONS_ERROR;
1272         }
1273
1274         if (exp_fmt) {
1275                 va_start(ap, exp_fmt);
1276                 expression = talloc_vasprintf(mem_ctx, exp_fmt, ap);
1277                 va_end(ap);
1278
1279                 if (!expression) {
1280                         talloc_free(res);
1281                         return LDB_ERR_OPERATIONS_ERROR;
1282                 }
1283         }
1284
1285         ret = ldb_build_search_req(&req, ldb, mem_ctx,
1286                                         base?base:ldb_get_default_basedn(ldb),
1287                                         scope,
1288                                         expression,
1289                                         attrs,
1290                                         NULL,
1291                                         res,
1292                                         ldb_search_default_callback,
1293                                         NULL);
1294
1295         if (ret != LDB_SUCCESS) goto done;
1296
1297         ret = ldb_request(ldb, req);
1298
1299         if (ret == LDB_SUCCESS) {
1300                 ret = ldb_wait(req->handle, LDB_WAIT_ALL);
1301         }
1302
1303 done:
1304         if (ret != LDB_SUCCESS) {
1305                 talloc_free(res);
1306                 res = NULL;
1307         }
1308
1309         talloc_free(expression);
1310         talloc_free(req);
1311
1312         *result = res;
1313         return ret;
1314 }
1315
1316 /*
1317   add a record to the database. Will fail if a record with the given class
1318   and key already exists
1319 */
1320 int ldb_add(struct ldb_context *ldb,
1321             const struct ldb_message *message)
1322 {
1323         struct ldb_request *req;
1324         int ret;
1325
1326         ret = ldb_msg_sanity_check(ldb, message);
1327         if (ret != LDB_SUCCESS) {
1328                 return ret;
1329         }
1330
1331         ret = ldb_build_add_req(&req, ldb, ldb,
1332                                         message,
1333                                         NULL,
1334                                         NULL,
1335                                         ldb_op_default_callback,
1336                                         NULL);
1337
1338         if (ret != LDB_SUCCESS) return ret;
1339
1340         /* do request and autostart a transaction */
1341         ret = ldb_autotransaction_request(ldb, req);
1342
1343         talloc_free(req);
1344         return ret;
1345 }
1346
1347 /*
1348   modify the specified attributes of a record
1349 */
1350 int ldb_modify(struct ldb_context *ldb,
1351                const struct ldb_message *message)
1352 {
1353         struct ldb_request *req;
1354         int ret;
1355
1356         ret = ldb_msg_sanity_check(ldb, message);
1357         if (ret != LDB_SUCCESS) {
1358                 return ret;
1359         }
1360
1361         ret = ldb_build_mod_req(&req, ldb, ldb,
1362                                         message,
1363                                         NULL,
1364                                         NULL,
1365                                         ldb_op_default_callback,
1366                                         NULL);
1367
1368         if (ret != LDB_SUCCESS) return ret;
1369
1370         /* do request and autostart a transaction */
1371         ret = ldb_autotransaction_request(ldb, req);
1372
1373         talloc_free(req);
1374         return ret;
1375 }
1376
1377
1378 /*
1379   delete a record from the database
1380 */
1381 int ldb_delete(struct ldb_context *ldb, struct ldb_dn *dn)
1382 {
1383         struct ldb_request *req;
1384         int ret;
1385
1386         ret = ldb_build_del_req(&req, ldb, ldb,
1387                                         dn,
1388                                         NULL,
1389                                         NULL,
1390                                         ldb_op_default_callback,
1391                                         NULL);
1392
1393         if (ret != LDB_SUCCESS) return ret;
1394
1395         /* do request and autostart a transaction */
1396         ret = ldb_autotransaction_request(ldb, req);
1397
1398         talloc_free(req);
1399         return ret;
1400 }
1401
1402 /*
1403   rename a record in the database
1404 */
1405 int ldb_rename(struct ldb_context *ldb,
1406                 struct ldb_dn *olddn, struct ldb_dn *newdn)
1407 {
1408         struct ldb_request *req;
1409         int ret;
1410
1411         ret = ldb_build_rename_req(&req, ldb, ldb,
1412                                         olddn,
1413                                         newdn,
1414                                         NULL,
1415                                         NULL,
1416                                         ldb_op_default_callback,
1417                                         NULL);
1418
1419         if (ret != LDB_SUCCESS) return ret;
1420
1421         /* do request and autostart a transaction */
1422         ret = ldb_autotransaction_request(ldb, req);
1423
1424         talloc_free(req);
1425         return ret;
1426 }
1427
1428
1429 /*
1430   return the global sequence number
1431 */
1432 int ldb_sequence_number(struct ldb_context *ldb,
1433                         enum ldb_sequence_type type, uint64_t *seq_num)
1434 {
1435         struct ldb_seqnum_request *seq;
1436         struct ldb_seqnum_result *seqr;
1437         struct ldb_result *res;
1438         TALLOC_CTX *tmp_ctx;
1439         int ret;
1440
1441         *seq_num = 0;
1442
1443         tmp_ctx = talloc_zero(ldb, struct ldb_request);
1444         if (tmp_ctx == NULL) {
1445                 ldb_set_errstring(ldb, "Out of Memory");
1446                 return LDB_ERR_OPERATIONS_ERROR;
1447         }
1448         seq = talloc_zero(tmp_ctx, struct ldb_seqnum_request);
1449         if (seq == NULL) {
1450                 ldb_set_errstring(ldb, "Out of Memory");
1451                 ret = LDB_ERR_OPERATIONS_ERROR;
1452                 goto done;
1453         }
1454         seq->type = type;
1455
1456         ret = ldb_extended(ldb, LDB_EXTENDED_SEQUENCE_NUMBER, seq, &res);
1457         if (ret != LDB_SUCCESS) {
1458                 goto done;
1459         }
1460         talloc_steal(tmp_ctx, res);
1461
1462         if (strcmp(LDB_EXTENDED_SEQUENCE_NUMBER, res->extended->oid) != 0) {
1463                 ldb_set_errstring(ldb, "Invalid OID in reply");
1464                 ret = LDB_ERR_OPERATIONS_ERROR;
1465                 goto done;
1466         }
1467         seqr = talloc_get_type(res->extended->data,
1468                                 struct ldb_seqnum_result);
1469         *seq_num = seqr->seq_num;
1470
1471 done:
1472         talloc_free(tmp_ctx);
1473         return ret;
1474 }
1475
1476 /*
1477   return extended error information
1478 */
1479 const char *ldb_errstring(struct ldb_context *ldb)
1480 {
1481         if (ldb->err_string) {
1482                 return ldb->err_string;
1483         }
1484
1485         return NULL;
1486 }
1487
1488 /*
1489   return a string explaining what a ldb error constant meancs
1490 */
1491 const char *ldb_strerror(int ldb_err)
1492 {
1493         switch (ldb_err) {
1494         case LDB_SUCCESS:
1495                 return "Success";
1496         case LDB_ERR_OPERATIONS_ERROR:
1497                 return "Operations error";
1498         case LDB_ERR_PROTOCOL_ERROR:
1499                 return "Protocol error";
1500         case LDB_ERR_TIME_LIMIT_EXCEEDED:
1501                 return "Time limit exceeded";
1502         case LDB_ERR_SIZE_LIMIT_EXCEEDED:
1503                 return "Size limit exceeded";
1504         case LDB_ERR_COMPARE_FALSE:
1505                 return "Compare false";
1506         case LDB_ERR_COMPARE_TRUE:
1507                 return "Compare true";
1508         case LDB_ERR_AUTH_METHOD_NOT_SUPPORTED:
1509                 return "Auth method not supported";
1510         case LDB_ERR_STRONG_AUTH_REQUIRED:
1511                 return "Strong auth required";
1512 /* 9 RESERVED */
1513         case LDB_ERR_REFERRAL:
1514                 return "Referral error";
1515         case LDB_ERR_ADMIN_LIMIT_EXCEEDED:
1516                 return "Admin limit exceeded";
1517         case LDB_ERR_UNSUPPORTED_CRITICAL_EXTENSION:
1518                 return "Unsupported critical extension";
1519         case LDB_ERR_CONFIDENTIALITY_REQUIRED:
1520                 return "Confidentiality required";
1521         case LDB_ERR_SASL_BIND_IN_PROGRESS:
1522                 return "SASL bind in progress";
1523         case LDB_ERR_NO_SUCH_ATTRIBUTE:
1524                 return "No such attribute";
1525         case LDB_ERR_UNDEFINED_ATTRIBUTE_TYPE:
1526                 return "Undefined attribute type";
1527         case LDB_ERR_INAPPROPRIATE_MATCHING:
1528                 return "Inappropriate matching";
1529         case LDB_ERR_CONSTRAINT_VIOLATION:
1530                 return "Constraint violation";
1531         case LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS:
1532                 return "Attribute or value exists";
1533         case LDB_ERR_INVALID_ATTRIBUTE_SYNTAX:
1534                 return "Invalid attribute syntax";
1535 /* 22-31 unused */
1536         case LDB_ERR_NO_SUCH_OBJECT:
1537                 return "No such object";
1538         case LDB_ERR_ALIAS_PROBLEM:
1539                 return "Alias problem";
1540         case LDB_ERR_INVALID_DN_SYNTAX:
1541                 return "Invalid DN syntax";
1542 /* 35 RESERVED */
1543         case LDB_ERR_ALIAS_DEREFERENCING_PROBLEM:
1544                 return "Alias dereferencing problem";
1545 /* 37-47 unused */
1546         case LDB_ERR_INAPPROPRIATE_AUTHENTICATION:
1547                 return "Inappropriate authentication";
1548         case LDB_ERR_INVALID_CREDENTIALS:
1549                 return "Invalid credentials";
1550         case LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS:
1551                 return "insufficient access rights";
1552         case LDB_ERR_BUSY:
1553                 return "Busy";
1554         case LDB_ERR_UNAVAILABLE:
1555                 return "Unavailable";
1556         case LDB_ERR_UNWILLING_TO_PERFORM:
1557                 return "Unwilling to perform";
1558         case LDB_ERR_LOOP_DETECT:
1559                 return "Loop detect";
1560 /* 55-63 unused */
1561         case LDB_ERR_NAMING_VIOLATION:
1562                 return "Naming violation";
1563         case LDB_ERR_OBJECT_CLASS_VIOLATION:
1564                 return "Object class violation";
1565         case LDB_ERR_NOT_ALLOWED_ON_NON_LEAF:
1566                 return "Not allowed on non-leaf";
1567         case LDB_ERR_NOT_ALLOWED_ON_RDN:
1568                 return "Not allowed on RDN";
1569         case LDB_ERR_ENTRY_ALREADY_EXISTS:
1570                 return "Entry already exists";
1571         case LDB_ERR_OBJECT_CLASS_MODS_PROHIBITED:
1572                 return "Object class mods prohibited";
1573 /* 70 RESERVED FOR CLDAP */
1574         case LDB_ERR_AFFECTS_MULTIPLE_DSAS:
1575                 return "Affects multiple DSAs";
1576 /* 72-79 unused */
1577         case LDB_ERR_OTHER:
1578                 return "Other";
1579         }
1580
1581         return "Unknown error";
1582 }
1583
1584 /*
1585   set backend specific opaque parameters
1586 */
1587 int ldb_set_opaque(struct ldb_context *ldb, const char *name, void *value)
1588 {
1589         struct ldb_opaque *o;
1590
1591         /* allow updating an existing value */
1592         for (o=ldb->opaque;o;o=o->next) {
1593                 if (strcmp(o->name, name) == 0) {
1594                         o->value = value;
1595                         return LDB_SUCCESS;
1596                 }
1597         }
1598
1599         o = talloc(ldb, struct ldb_opaque);
1600         if (o == NULL) {
1601                 ldb_oom(ldb);
1602                 return LDB_ERR_OTHER;
1603         }
1604         o->next = ldb->opaque;
1605         o->name = name;
1606         o->value = value;
1607         ldb->opaque = o;
1608         return LDB_SUCCESS;
1609 }
1610
1611 /*
1612   get a previously set opaque value
1613 */
1614 void *ldb_get_opaque(struct ldb_context *ldb, const char *name)
1615 {
1616         struct ldb_opaque *o;
1617         for (o=ldb->opaque;o;o=o->next) {
1618                 if (strcmp(o->name, name) == 0) {
1619                         return o->value;
1620                 }
1621         }
1622         return NULL;
1623 }
1624
1625 int ldb_global_init(void)
1626 {
1627         /* Provided for compatibility with some older versions of ldb */
1628         return 0;
1629 }
1630
1631 /* return the ldb flags */
1632 unsigned int ldb_get_flags(struct ldb_context *ldb)
1633 {
1634         return ldb->flags;
1635 }
1636
1637 /* set the ldb flags */
1638 void ldb_set_flags(struct ldb_context *ldb, unsigned flags)
1639 {
1640         ldb->flags = flags;
1641 }