source/lib/ldb/ldb_tdb/ldb_tdb.c

   1 /*
   2    ldb database library
   3
   4    Copyright (C) Andrew Tridgell  2004
   5    Copyright (C) Stefan Metzmacher  2004
   6    Copyright (C) Simo Sorce       2006
   7
   8
   9      ** NOTE! The following LGPL license applies to the ldb
  10      ** library. This does NOT imply that all of Samba is released
  11      ** under the LGPL
  12
  13    This library is free software; you can redistribute it and/or
  14    modify it under the terms of the GNU Lesser General Public
  15    License as published by the Free Software Foundation; either
  16    version 2 of the License, or (at your option) any later version.
  17
  18    This library is distributed in the hope that it will be useful,
  19    but WITHOUT ANY WARRANTY; without even the implied warranty of
  20    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21    Lesser General Public License for more details.
  22
  23    You should have received a copy of the GNU Lesser General Public
  24    License along with this library; if not, write to the Free Software
  25    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  26 */
  27
  28 /*
  29  *  Name: ldb_tdb
  30  *
  31  *  Component: ldb tdb backend
  32  *
  33  *  Description: core functions for tdb backend
  34  *
  35  *  Author: Andrew Tridgell
  36  *  Author: Stefan Metzmacher
  37  *
  38  *  Modifications:
  39  *
  40  *  - description: make the module use asyncronous calls
  41  *    date: Feb 2006
  42  *    Author: Simo Sorce
  43  */
  44
  45 #include "includes.h"
  46 #include "ldb/include/includes.h"
  47
  48 #include "ldb/ldb_tdb/ldb_tdb.h"
  49
  50
  51 /*
  52   map a tdb error code to a ldb error code
  53 */
  54 static int ltdb_err_map(enum TDB_ERROR tdb_code)
  55 {
  56         switch (tdb_code) {
  57         case TDB_SUCCESS:
  58                 return LDB_SUCCESS;
  59         case TDB_ERR_CORRUPT:
  60         case TDB_ERR_OOM:
  61         case TDB_ERR_EINVAL:
  62                 return LDB_ERR_OPERATIONS_ERROR;
  63         case TDB_ERR_IO:
  64                 return LDB_ERR_PROTOCOL_ERROR;
  65         case TDB_ERR_LOCK:
  66         case TDB_ERR_NOLOCK:
  67                 return LDB_ERR_BUSY;
  68         case TDB_ERR_LOCK_TIMEOUT:
  69                 return LDB_ERR_TIME_LIMIT_EXCEEDED;
  70         case TDB_ERR_EXISTS:
  71                 return LDB_ERR_ENTRY_ALREADY_EXISTS;
  72         case TDB_ERR_NOEXIST:
  73                 return LDB_ERR_NO_SUCH_OBJECT;
  74         case TDB_ERR_RDONLY:
  75                 return LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS;
  76         }
  77         return LDB_ERR_OTHER;
  78 }
  79
  80
  81 struct ldb_handle *init_ltdb_handle(struct ltdb_private *ltdb, struct ldb_module *module,
  82                                           void *context,
  83                                           int (*callback)(struct ldb_context *, void *, struct ldb_reply *))
  84 {
  85         struct ltdb_context *ac;
  86         struct ldb_handle *h;
  87
  88         h = talloc_zero(ltdb, struct ldb_handle);
  89         if (h == NULL) {
  90                 ldb_set_errstring(module->ldb, "Out of Memory");
  91                 return NULL;
  92         }
  93
  94         h->module = module;
  95
  96         ac = talloc_zero(h, struct ltdb_context);
  97         if (ac == NULL) {
  98                 ldb_set_errstring(module->ldb, "Out of Memory");
  99                 talloc_free(h);
 100                 return NULL;
 101         }
 102
 103         h->private_data = (void *)ac;
 104
 105         h->state = LDB_ASYNC_INIT;
 106         h->status = LDB_SUCCESS;
 107
 108         ac->module = module;
 109         ac->context = context;
 110         ac->callback = callback;
 111
 112         return h;
 113 }
 114
 115 /*
 116   form a TDB_DATA for a record key
 117   caller frees
 118
 119   note that the key for a record can depend on whether the
 120   dn refers to a case sensitive index record or not
 121 */
 122 struct TDB_DATA ltdb_key(struct ldb_module *module, const struct ldb_dn *dn)
 123 {
 124         struct ldb_context *ldb = module->ldb;
 125         TDB_DATA key;
 126         char *key_str = NULL;
 127         char *dn_folded = NULL;
 128
 129         /*
 130           most DNs are case insensitive. The exception is index DNs for
 131           case sensitive attributes
 132
 133           there are 3 cases dealt with in this code:
 134
 135           1) if the dn doesn't start with @ then uppercase the attribute
 136              names and the attributes values of case insensitive attributes
 137           2) if the dn starts with @ then leave it alone - the indexing code handles
 138              the rest
 139         */
 140
 141         dn_folded = ldb_dn_linearize_casefold(ldb, dn);
 142         if (!dn_folded) {
 143                 goto failed;
 144         }
 145
 146         key_str = talloc_asprintf(ldb, "DN=%s", dn_folded);
 147
 148         talloc_free(dn_folded);
 149
 150         if (!key_str) {
 151                 goto failed;
 152         }
 153
 154         key.dptr = (uint8_t *)key_str;
 155         key.dsize = strlen(key_str) + 1;
 156
 157         return key;
 158
 159 failed:
 160         errno = ENOMEM;
 161         key.dptr = NULL;
 162         key.dsize = 0;
 163         return key;
 164 }
 165
 166 /*
 167   check special dn's have valid attributes
 168   currently only @ATTRIBUTES is checked
 169 */
 170 int ltdb_check_special_dn(struct ldb_module *module, const struct ldb_message *msg)
 171 {
 172         int i, j;
 173
 174         if (! ldb_dn_is_special(msg->dn) ||
 175             ! ldb_dn_check_special(msg->dn, LTDB_ATTRIBUTES)) {
 176                 return 0;
 177         }
 178
 179         /* we have @ATTRIBUTES, let's check attributes are fine */
 180         /* should we check that we deny multivalued attributes ? */
 181         for (i = 0; i < msg->num_elements; i++) {
 182                 for (j = 0; j < msg->elements[i].num_values; j++) {
 183                         if (ltdb_check_at_attributes_values(&msg->elements[i].values[j]) != 0) {
 184                                 ldb_set_errstring(module->ldb, "Invalid attribute value in an @ATTRIBUTES entry");
 185                                 return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
 186                         }
 187                 }
 188         }
 189
 190         return 0;
 191 }
 192
 193
 194 /*
 195   we've made a modification to a dn - possibly reindex and
 196   update sequence number
 197 */
 198 static int ltdb_modified(struct ldb_module *module, const struct ldb_dn *dn)
 199 {
 200         int ret = 0;
 201
 202         if (ldb_dn_is_special(dn) &&
 203             (ldb_dn_check_special(dn, LTDB_INDEXLIST) ||
 204              ldb_dn_check_special(dn, LTDB_ATTRIBUTES)) ) {
 205                 ret = ltdb_reindex(module);
 206         }
 207
 208         if (ret == 0 &&
 209             !(ldb_dn_is_special(dn) &&
 210               ldb_dn_check_special(dn, LTDB_BASEINFO)) ) {
 211                 ret = ltdb_increase_sequence_number(module);
 212         }
 213
 214         return ret;
 215 }
 216
 217 /*
 218   store a record into the db
 219 */
 220 int ltdb_store(struct ldb_module *module, const struct ldb_message *msg, int flgs)
 221 {
 222         struct ltdb_private *ltdb =
 223                 talloc_get_type(module->private_data, struct ltdb_private);
 224         TDB_DATA tdb_key, tdb_data;
 225         int ret;
 226
 227         tdb_key = ltdb_key(module, msg->dn);
 228         if (!tdb_key.dptr) {
 229                 return LDB_ERR_OTHER;
 230         }
 231
 232         ret = ltdb_pack_data(module, msg, &tdb_data);
 233         if (ret == -1) {
 234                 talloc_free(tdb_key.dptr);
 235                 return LDB_ERR_OTHER;
 236         }
 237
 238         ret = tdb_store(ltdb->tdb, tdb_key, tdb_data, flgs);
 239         if (ret == -1) {
 240                 ret = ltdb_err_map(tdb_error(ltdb->tdb));
 241                 goto done;
 242         }
 243
 244         ret = ltdb_index_add(module, msg);
 245         if (ret == -1) {
 246                 tdb_delete(ltdb->tdb, tdb_key);
 247         }
 248
 249 done:
 250         talloc_free(tdb_key.dptr);
 251         talloc_free(tdb_data.dptr);
 252
 253         return ret;
 254 }
 255
 256
 257 static int ltdb_add_internal(struct ldb_module *module, const struct ldb_message *msg)
 258 {
 259         int ret;
 260
 261         ret = ltdb_check_special_dn(module, msg);
 262         if (ret != LDB_SUCCESS) {
 263                 return ret;
 264         }
 265
 266         if (ltdb_cache_load(module) != 0) {
 267                 return LDB_ERR_OPERATIONS_ERROR;
 268         }
 269
 270         ret = ltdb_store(module, msg, TDB_INSERT);
 271
 272         if (ret == LDB_ERR_ENTRY_ALREADY_EXISTS) {
 273                 char *dn;
 274
 275                 dn = ldb_dn_linearize(module, msg->dn);
 276                 if (!dn) {
 277                         return ret;
 278                 }
 279                 ldb_asprintf_errstring(module->ldb, "Entry %s already exists", dn);
 280                 talloc_free(dn);
 281                 return ret;
 282         }
 283
 284         if (ret == LDB_SUCCESS) {
 285                 ret = ltdb_modified(module, msg->dn);
 286                 if (ret != LDB_SUCCESS) {
 287                         return LDB_ERR_OPERATIONS_ERROR;
 288                 }
 289         }
 290
 291         return ret;
 292 }
 293
 294 /*
 295   add a record to the database
 296 */
 297 static int ltdb_add(struct ldb_module *module, struct ldb_request *req)
 298 {
 299         struct ltdb_private *ltdb = talloc_get_type(module->private_data, struct ltdb_private);
 300         struct ltdb_context *ltdb_ac;
 301         int tret, ret = LDB_SUCCESS;
 302
 303         if (req->controls != NULL) {
 304                 ldb_debug(module->ldb, LDB_DEBUG_WARNING, "Controls should not reach the ldb_tdb backend!\n");
 305                 if (check_critical_controls(req->controls)) {
 306                         return LDB_ERR_UNSUPPORTED_CRITICAL_EXTENSION;
 307                 }
 308         }
 309
 310         req->handle = init_ltdb_handle(ltdb, module, req->context, req->callback);
 311         if (req->handle == NULL) {
 312                 return LDB_ERR_OPERATIONS_ERROR;
 313         }
 314         ltdb_ac = talloc_get_type(req->handle->private_data, struct ltdb_context);
 315
 316         tret = ltdb_add_internal(module, req->op.add.message);
 317         if (tret != LDB_SUCCESS) {
 318                 req->handle->status = tret;
 319                 goto done;
 320         }
 321
 322         if (ltdb_ac->callback) {
 323                 ret = ltdb_ac->callback(module->ldb, ltdb_ac->context, NULL);
 324         }
 325 done:
 326         req->handle->state = LDB_ASYNC_DONE;
 327         return ret;
 328 }
 329
 330 /*
 331   delete a record from the database, not updating indexes (used for deleting
 332   index records)
 333 */
 334 int ltdb_delete_noindex(struct ldb_module *module, const struct ldb_dn *dn)
 335 {
 336         struct ltdb_private *ltdb =
 337                 talloc_get_type(module->private_data, struct ltdb_private);
 338         TDB_DATA tdb_key;
 339         int ret;
 340
 341         tdb_key = ltdb_key(module, dn);
 342         if (!tdb_key.dptr) {
 343                 return LDB_ERR_OTHER;
 344         }
 345
 346         ret = tdb_delete(ltdb->tdb, tdb_key);
 347         talloc_free(tdb_key.dptr);
 348
 349         if (ret != 0) {
 350                 ret = ltdb_err_map(tdb_error(ltdb->tdb));
 351         }
 352
 353         return ret;
 354 }
 355
 356 static int ltdb_delete_internal(struct ldb_module *module, const struct ldb_dn *dn)
 357 {
 358         struct ldb_message *msg;
 359         int ret;
 360
 361         msg = talloc(module, struct ldb_message);
 362         if (msg == NULL) {
 363                 return LDB_ERR_OPERATIONS_ERROR;
 364         }
 365
 366         /* in case any attribute of the message was indexed, we need
 367            to fetch the old record */
 368         ret = ltdb_search_dn1(module, dn, msg);
 369         if (ret != 1) {
 370                 /* not finding the old record is an error */
 371                 talloc_free(msg);
 372                 return LDB_ERR_NO_SUCH_OBJECT;
 373         }
 374
 375         ret = ltdb_delete_noindex(module, dn);
 376         if (ret != LDB_SUCCESS) {
 377                 talloc_free(msg);
 378                 return LDB_ERR_NO_SUCH_OBJECT;
 379         }
 380
 381         /* remove any indexed attributes */
 382         ret = ltdb_index_del(module, msg);
 383         if (ret != LDB_SUCCESS) {
 384                 talloc_free(msg);
 385                 return LDB_ERR_OPERATIONS_ERROR;
 386         }
 387
 388         ret = ltdb_modified(module, dn);
 389         if (ret != LDB_SUCCESS) {
 390                 return LDB_ERR_OPERATIONS_ERROR;
 391         }
 392
 393         talloc_free(msg);
 394         return LDB_SUCCESS;
 395 }
 396
 397 /*
 398   delete a record from the database
 399 */
 400 static int ltdb_delete(struct ldb_module *module, struct ldb_request *req)
 401 {
 402         struct ltdb_private *ltdb = talloc_get_type(module->private_data, struct ltdb_private);
 403         struct ltdb_context *ltdb_ac;
 404         int tret, ret = LDB_SUCCESS;
 405
 406         if (req->controls != NULL) {
 407                 ldb_debug(module->ldb, LDB_DEBUG_WARNING, "Controls should not reach the ldb_tdb backend!\n");
 408                 if (check_critical_controls(req->controls)) {
 409                         return LDB_ERR_UNSUPPORTED_CRITICAL_EXTENSION;
 410                 }
 411         }
 412
 413         req->handle = NULL;
 414
 415         if (ltdb_cache_load(module) != 0) {
 416                 return LDB_ERR_OPERATIONS_ERROR;
 417         }
 418
 419         req->handle = init_ltdb_handle(ltdb, module, req->context, req->callback);
 420         if (req->handle == NULL) {
 421                 return LDB_ERR_OPERATIONS_ERROR;
 422         }
 423         ltdb_ac = talloc_get_type(req->handle->private_data, struct ltdb_context);
 424
 425         tret = ltdb_delete_internal(module, req->op.del.dn);
 426         if (tret != LDB_SUCCESS) {
 427                 req->handle->status = tret;
 428                 goto done;
 429         }
 430
 431         if (ltdb_ac->callback) {
 432                 ret = ltdb_ac->callback(module->ldb, ltdb_ac->context, NULL);
 433         }
 434 done:
 435         req->handle->state = LDB_ASYNC_DONE;
 436         return ret;
 437 }
 438
 439 /*
 440   find an element by attribute name. At the moment this does a linear search, it should
 441   be re-coded to use a binary search once all places that modify records guarantee
 442   sorted order
 443
 444   return the index of the first matching element if found, otherwise -1
 445 */
 446 static int find_element(const struct ldb_message *msg, const char *name)
 447 {
 448         unsigned int i;
 449         for (i=0;i<msg->num_elements;i++) {
 450                 if (ldb_attr_cmp(msg->elements[i].name, name) == 0) {
 451                         return i;
 452                 }
 453         }
 454         return -1;
 455 }
 456
 457
 458 /*
 459   add an element to an existing record. Assumes a elements array that we
 460   can call re-alloc on, and assumed that we can re-use the data pointers from the
 461   passed in additional values. Use with care!
 462
 463   returns 0 on success, -1 on failure (and sets errno)
 464 */
 465 static int msg_add_element(struct ldb_context *ldb,
 466                            struct ldb_message *msg, struct ldb_message_element *el)
 467 {
 468         struct ldb_message_element *e2;
 469         unsigned int i;
 470
 471         e2 = talloc_realloc(msg, msg->elements, struct ldb_message_element,
 472                               msg->num_elements+1);
 473         if (!e2) {
 474                 errno = ENOMEM;
 475                 return -1;
 476         }
 477
 478         msg->elements = e2;
 479
 480         e2 = &msg->elements[msg->num_elements];
 481
 482         e2->name = el->name;
 483         e2->flags = el->flags;
 484         e2->values = NULL;
 485         if (el->num_values != 0) {
 486                 e2->values = talloc_array(msg->elements, struct ldb_val, el->num_values);
 487                 if (!e2->values) {
 488                         errno = ENOMEM;
 489                         return -1;
 490                 }
 491         }
 492         for (i=0;i<el->num_values;i++) {
 493                 e2->values[i] = el->values[i];
 494         }
 495         e2->num_values = el->num_values;
 496
 497         msg->num_elements++;
 498
 499         return 0;
 500 }
 501
 502 /*
 503   delete all elements having a specified attribute name
 504 */
 505 static int msg_delete_attribute(struct ldb_module *module,
 506                                 struct ldb_context *ldb,
 507                                 struct ldb_message *msg, const char *name)
 508 {
 509         char *dn;
 510         unsigned int i, j;
 511
 512         dn = ldb_dn_linearize(ldb, msg->dn);
 513         if (dn == NULL) {
 514                 return -1;
 515         }
 516
 517         for (i=0;i<msg->num_elements;i++) {
 518                 if (ldb_attr_cmp(msg->elements[i].name, name) == 0) {
 519                         for (j=0;j<msg->elements[i].num_values;j++) {
 520                                 ltdb_index_del_value(module, dn, &msg->elements[i], j);
 521                         }
 522                         talloc_free(msg->elements[i].values);
 523                         if (msg->num_elements > (i+1)) {
 524                                 memmove(&msg->elements[i],
 525                                         &msg->elements[i+1],
 526                                         sizeof(struct ldb_message_element)*
 527                                         (msg->num_elements - (i+1)));
 528                         }
 529                         msg->num_elements--;
 530                         i--;
 531                         msg->elements = talloc_realloc(msg, msg->elements,
 532                                                          struct ldb_message_element,
 533                                                          msg->num_elements);
 534                 }
 535         }
 536
 537         talloc_free(dn);
 538         return 0;
 539 }
 540
 541 /*
 542   delete all elements matching an attribute name/value
 543
 544   return 0 on success, -1 on failure
 545 */
 546 static int msg_delete_element(struct ldb_module *module,
 547                               struct ldb_message *msg,
 548                               const char *name,
 549                               const struct ldb_val *val)
 550 {
 551         struct ldb_context *ldb = module->ldb;
 552         unsigned int i;
 553         int found;
 554         struct ldb_message_element *el;
 555         const struct ldb_attrib_handler *h;
 556
 557         found = find_element(msg, name);
 558         if (found == -1) {
 559                 return -1;
 560         }
 561
 562         el = &msg->elements[found];
 563
 564         h = ldb_attrib_handler(ldb, el->name);
 565
 566         for (i=0;i<el->num_values;i++) {
 567                 if (h->comparison_fn(ldb, ldb, &el->values[i], val) == 0) {
 568                         if (i<el->num_values-1) {
 569                                 memmove(&el->values[i], &el->values[i+1],
 570                                         sizeof(el->values[i])*(el->num_values-(i+1)));
 571                         }
 572                         el->num_values--;
 573                         if (el->num_values == 0) {
 574                                 return msg_delete_attribute(module, ldb, msg, name);
 575                         }
 576                         return 0;
 577                 }
 578         }
 579
 580         return -1;
 581 }
 582
 583
 584 /*
 585   modify a record - internal interface
 586
 587   yuck - this is O(n^2). Luckily n is usually small so we probably
 588   get away with it, but if we ever have really large attribute lists
 589   then we'll need to look at this again
 590 */
 591 int ltdb_modify_internal(struct ldb_module *module, const struct ldb_message *msg)
 592 {
 593         struct ldb_context *ldb = module->ldb;
 594         struct ltdb_private *ltdb =
 595                 talloc_get_type(module->private_data, struct ltdb_private);
 596         TDB_DATA tdb_key, tdb_data;
 597         struct ldb_message *msg2;
 598         unsigned i, j;
 599         int ret;
 600
 601         tdb_key = ltdb_key(module, msg->dn);
 602         if (!tdb_key.dptr) {
 603                 return LDB_ERR_OTHER;
 604         }
 605
 606         tdb_data = tdb_fetch(ltdb->tdb, tdb_key);
 607         if (!tdb_data.dptr) {
 608                 talloc_free(tdb_key.dptr);
 609                 return ltdb_err_map(tdb_error(ltdb->tdb));
 610         }
 611
 612         msg2 = talloc(tdb_key.dptr, struct ldb_message);
 613         if (msg2 == NULL) {
 614                 talloc_free(tdb_key.dptr);
 615                 return LDB_ERR_OTHER;
 616         }
 617
 618         ret = ltdb_unpack_data(module, &tdb_data, msg2);
 619         if (ret == -1) {
 620                 ret = LDB_ERR_OTHER;
 621                 goto failed;
 622         }
 623
 624         if (!msg2->dn) {
 625                 msg2->dn = msg->dn;
 626         }
 627
 628         for (i=0;i<msg->num_elements;i++) {
 629                 struct ldb_message_element *el = &msg->elements[i];
 630                 struct ldb_message_element *el2;
 631                 struct ldb_val *vals;
 632                 char *dn;
 633
 634                 switch (msg->elements[i].flags & LDB_FLAG_MOD_MASK) {
 635
 636                 case LDB_FLAG_MOD_ADD:
 637                         /* add this element to the message. fail if it
 638                            already exists */
 639                         ret = find_element(msg2, el->name);
 640
 641                         if (ret == -1) {
 642                                 if (msg_add_element(ldb, msg2, el) != 0) {
 643                                         ret = LDB_ERR_OTHER;
 644                                         goto failed;
 645                                 }
 646                                 continue;
 647                         }
 648
 649                         el2 = &msg2->elements[ret];
 650
 651                         /* An attribute with this name already exists, add all
 652                          * values if they don't already exist. */
 653
 654                         for (j=0;j<el->num_values;j++) {
 655                                 if (ldb_msg_find_val(el2, &el->values[j])) {
 656                                         ldb_set_errstring(module->ldb, "Type or value exists");
 657                                         ret = LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS;
 658                                         goto failed;
 659                                 }
 660                         }
 661
 662                         vals = talloc_realloc(msg2->elements, el2->values, struct ldb_val,
 663                                                 el2->num_values + el->num_values);
 664
 665                         if (vals == NULL) {
 666                                 ret = LDB_ERR_OTHER;
 667                                 goto failed;
 668                         }
 669
 670                         for (j=0;j<el->num_values;j++) {
 671                                 vals[el2->num_values + j] =
 672                                         ldb_val_dup(vals, &el->values[j]);
 673                         }
 674
 675                         el2->values = vals;
 676                         el2->num_values += el->num_values;
 677
 678                         break;
 679
 680                 case LDB_FLAG_MOD_REPLACE:
 681                         /* replace all elements of this attribute name with the elements
 682                            listed. The attribute not existing is not an error */
 683                         msg_delete_attribute(module, ldb, msg2, msg->elements[i].name);
 684
 685                         /* add the replacement element, if not empty */
 686                         if (msg->elements[i].num_values != 0 &&
 687                             msg_add_element(ldb, msg2, &msg->elements[i]) != 0) {
 688                                 ret = LDB_ERR_OTHER;
 689                                 goto failed;
 690                         }
 691                         break;
 692
 693                 case LDB_FLAG_MOD_DELETE:
 694
 695                         dn = ldb_dn_linearize(msg2, msg->dn);
 696                         if (dn == NULL) {
 697                                 ret = LDB_ERR_OTHER;
 698                                 goto failed;
 699                         }
 700
 701                         /* we could be being asked to delete all
 702                            values or just some values */
 703                         if (msg->elements[i].num_values == 0) {
 704                                 if (msg_delete_attribute(module, ldb, msg2,
 705                                                          msg->elements[i].name) != 0) {
 706                                         ldb_asprintf_errstring(module->ldb, "No such attribute: %s for delete on %s", msg->elements[i].name, dn);
 707                                         ret = LDB_ERR_NO_SUCH_ATTRIBUTE;
 708                                         goto failed;
 709                                 }
 710                                 break;
 711                         }
 712                         for (j=0;j<msg->elements[i].num_values;j++) {
 713                                 if (msg_delete_element(module,
 714                                                        msg2,
 715                                                        msg->elements[i].name,
 716                                                        &msg->elements[i].values[j]) != 0) {
 717                                         ldb_asprintf_errstring(module->ldb, "No matching attribute value when deleting attribute: %s on %s", msg->elements[i].name, dn);
 718                                         ret = LDB_ERR_NO_SUCH_ATTRIBUTE;
 719                                         goto failed;
 720                                 }
 721                                 if (ltdb_index_del_value(module, dn, &msg->elements[i], j) != 0) {
 722                                         ret = LDB_ERR_OTHER;
 723                                         goto failed;
 724                                 }
 725                         }
 726                         break;
 727                 default:
 728                         ldb_asprintf_errstring(module->ldb, "Invalid ldb_modify flags on %s: 0x%x",
 729                                                              msg->elements[i].name,
 730                                                              msg->elements[i].flags & LDB_FLAG_MOD_MASK);
 731                         ret = LDB_ERR_PROTOCOL_ERROR;
 732                         goto failed;
 733                 }
 734         }
 735
 736         /* we've made all the mods - save the modified record back into the database */
 737         ret = ltdb_store(module, msg2, TDB_MODIFY);
 738         if (ret != LDB_SUCCESS) {
 739                 goto failed;
 740         }
 741
 742         if (ltdb_modified(module, msg->dn) != LDB_SUCCESS) {
 743                 ret = LDB_ERR_OPERATIONS_ERROR;
 744                 goto failed;
 745         }
 746
 747         talloc_free(tdb_key.dptr);
 748         free(tdb_data.dptr);
 749         return ret;
 750
 751 failed:
 752         talloc_free(tdb_key.dptr);
 753         free(tdb_data.dptr);
 754         return ret;
 755 }
 756
 757 /*
 758   modify a record
 759 */
 760 static int ltdb_modify(struct ldb_module *module, struct ldb_request *req)
 761 {
 762         struct ltdb_private *ltdb = talloc_get_type(module->private_data, struct ltdb_private);
 763         struct ltdb_context *ltdb_ac;
 764         int tret, ret = LDB_SUCCESS;
 765
 766         if (req->controls != NULL) {
 767                 ldb_debug(module->ldb, LDB_DEBUG_WARNING, "Controls should not reach the ldb_tdb backend!\n");
 768                 if (check_critical_controls(req->controls)) {
 769                         return LDB_ERR_UNSUPPORTED_CRITICAL_EXTENSION;
 770                 }
 771         }
 772
 773         req->handle = NULL;
 774
 775         req->handle = init_ltdb_handle(ltdb, module, req->context, req->callback);
 776         if (req->handle == NULL) {
 777                 return LDB_ERR_OPERATIONS_ERROR;
 778         }
 779         ltdb_ac = talloc_get_type(req->handle->private_data, struct ltdb_context);
 780
 781         tret = ltdb_check_special_dn(module, req->op.mod.message);
 782         if (tret != LDB_SUCCESS) {
 783                 req->handle->status = tret;
 784                 goto done;
 785         }
 786
 787         if (ltdb_cache_load(module) != 0) {
 788                 ret = LDB_ERR_OPERATIONS_ERROR;
 789                 goto done;
 790         }
 791
 792         tret = ltdb_modify_internal(module, req->op.mod.message);
 793         if (tret != LDB_SUCCESS) {
 794                 req->handle->status = tret;
 795                 goto done;
 796         }
 797
 798         if (ltdb_ac->callback) {
 799                 ret = ltdb_ac->callback(module->ldb, ltdb_ac->context, NULL);
 800         }
 801 done:
 802         req->handle->state = LDB_ASYNC_DONE;
 803         return ret;
 804 }
 805
 806 /*
 807   rename a record
 808 */
 809 static int ltdb_rename(struct ldb_module *module, struct ldb_request *req)
 810 {
 811         struct ltdb_private *ltdb = talloc_get_type(module->private_data, struct ltdb_private);
 812         struct ltdb_context *ltdb_ac;
 813         struct ldb_message *msg;
 814         int tret, ret = LDB_SUCCESS;
 815
 816         if (req->controls != NULL) {
 817                 ldb_debug(module->ldb, LDB_DEBUG_WARNING, "Controls should not reach the ldb_tdb backend!\n");
 818                 if (check_critical_controls(req->controls)) {
 819                         return LDB_ERR_UNSUPPORTED_CRITICAL_EXTENSION;
 820                 }
 821         }
 822
 823         req->handle = NULL;
 824
 825         if (ltdb_cache_load(module) != 0) {
 826                 return LDB_ERR_OPERATIONS_ERROR;
 827         }
 828
 829         req->handle = init_ltdb_handle(ltdb, module, req->context, req->callback);
 830         if (req->handle == NULL) {
 831                 return LDB_ERR_OPERATIONS_ERROR;
 832         }
 833         ltdb_ac = talloc_get_type(req->handle->private_data, struct ltdb_context);
 834
 835         msg = talloc(ltdb_ac, struct ldb_message);
 836         if (msg == NULL) {
 837                 ret = LDB_ERR_OPERATIONS_ERROR;
 838                 goto done;
 839         }
 840
 841         /* in case any attribute of the message was indexed, we need
 842            to fetch the old record */
 843         tret = ltdb_search_dn1(module, req->op.rename.olddn, msg);
 844         if (tret != 1) {
 845                 /* not finding the old record is an error */
 846                 req->handle->status = LDB_ERR_NO_SUCH_OBJECT;
 847                 goto done;
 848         }
 849
 850         msg->dn = ldb_dn_copy(msg, req->op.rename.newdn);
 851         if (!msg->dn) {
 852                 ret = LDB_ERR_OPERATIONS_ERROR;
 853                 goto done;
 854         }
 855
 856         tret = ltdb_add_internal(module, msg);
 857         if (tret != LDB_SUCCESS) {
 858                 ret = LDB_ERR_OPERATIONS_ERROR;
 859                 goto done;
 860         }
 861
 862         tret = ltdb_delete_internal(module, req->op.rename.olddn);
 863         if (tret != LDB_SUCCESS) {
 864                 ltdb_delete_internal(module, req->op.rename.newdn);
 865                 ret = LDB_ERR_OPERATIONS_ERROR;
 866                 goto done;
 867         }
 868
 869         if (ltdb_ac->callback) {
 870                 ret = ltdb_ac->callback(module->ldb, ltdb_ac->context, NULL);
 871         }
 872 done:
 873         req->handle->state = LDB_ASYNC_DONE;
 874         return ret;
 875 }
 876
 877 static int ltdb_start_trans(struct ldb_module *module)
 878 {
 879         struct ltdb_private *ltdb =
 880                 talloc_get_type(module->private_data, struct ltdb_private);
 881
 882         if (tdb_transaction_start(ltdb->tdb) != 0) {
 883                 return ltdb_err_map(tdb_error(ltdb->tdb));
 884         }
 885
 886         return LDB_SUCCESS;
 887 }
 888
 889 static int ltdb_end_trans(struct ldb_module *module)
 890 {
 891         struct ltdb_private *ltdb =
 892                 talloc_get_type(module->private_data, struct ltdb_private);
 893
 894         if (tdb_transaction_commit(ltdb->tdb) != 0) {
 895                 return ltdb_err_map(tdb_error(ltdb->tdb));
 896         }
 897
 898         return LDB_SUCCESS;
 899 }
 900
 901 static int ltdb_del_trans(struct ldb_module *module)
 902 {
 903         struct ltdb_private *ltdb =
 904                 talloc_get_type(module->private_data, struct ltdb_private);
 905
 906         if (tdb_transaction_cancel(ltdb->tdb) != 0) {
 907                 return ltdb_err_map(tdb_error(ltdb->tdb));
 908         }
 909
 910         return LDB_SUCCESS;
 911 }
 912
 913 static int ltdb_wait(struct ldb_handle *handle, enum ldb_wait_type type)
 914 {
 915         return handle->status;
 916 }
 917
 918 static int ltdb_request(struct ldb_module *module, struct ldb_request *req)
 919 {
 920         /* check for oustanding critical controls and return an error if found */
 921         if (req->controls != NULL) {
 922                 ldb_debug(module->ldb, LDB_DEBUG_WARNING, "Controls should not reach the ldb_tdb backend!\n");
 923                 if (check_critical_controls(req->controls)) {
 924                         return LDB_ERR_UNSUPPORTED_CRITICAL_EXTENSION;
 925                 }
 926         }
 927
 928         /* search, add, modify, delete, rename are handled by their own, no other op supported */
 929         return LDB_ERR_OPERATIONS_ERROR;
 930 }
 931
 932 /*
 933   return sequenceNumber from @BASEINFO
 934 */
 935 static int ltdb_sequence_number(struct ldb_module *module, struct ldb_request *req)
 936 {
 937         TALLOC_CTX *tmp_ctx = talloc_new(req);
 938         struct ldb_message *msg = NULL;
 939         struct ldb_dn *dn = ldb_dn_explode(tmp_ctx, LTDB_BASEINFO);
 940         int tret;
 941
 942         if (tmp_ctx == NULL) {
 943                 talloc_free(tmp_ctx);
 944                 return LDB_ERR_OPERATIONS_ERROR;
 945         }
 946
 947         msg = talloc(tmp_ctx, struct ldb_message);
 948         if (msg == NULL) {
 949                 talloc_free(tmp_ctx);
 950                 return LDB_ERR_OPERATIONS_ERROR;
 951         }
 952
 953         req->op.seq_num.flags = 0;
 954
 955         tret = ltdb_search_dn1(module, dn, msg);
 956         if (tret != 1) {
 957                 talloc_free(tmp_ctx);
 958                 req->op.seq_num.seq_num = 0;
 959                 /* zero is as good as anything when we don't know */
 960                 return LDB_SUCCESS;
 961         }
 962
 963         switch (req->op.seq_num.type) {
 964         case LDB_SEQ_HIGHEST_SEQ:
 965                 req->op.seq_num.seq_num = ldb_msg_find_attr_as_uint64(msg, LTDB_SEQUENCE_NUMBER, 0);
 966                 break;
 967         case LDB_SEQ_NEXT:
 968                 req->op.seq_num.seq_num = ldb_msg_find_attr_as_uint64(msg, LTDB_SEQUENCE_NUMBER, 0);
 969                 req->op.seq_num.seq_num++;
 970                 break;
 971         case LDB_SEQ_HIGHEST_TIMESTAMP:
 972         {
 973                 const char *date = ldb_msg_find_attr_as_string(msg, LTDB_MOD_TIMESTAMP, NULL);
 974                 if (date) {
 975                         req->op.seq_num.seq_num = ldb_string_to_time(date);
 976                 } else {
 977                         req->op.seq_num.seq_num = 0;
 978                         /* zero is as good as anything when we don't know */
 979                 }
 980                 break;
 981         }
 982         }
 983         talloc_free(tmp_ctx);
 984         return LDB_SUCCESS;
 985 }
 986
 987 static const struct ldb_module_ops ltdb_ops = {
 988         .name              = "tdb",
 989         .search            = ltdb_search,
 990         .add               = ltdb_add,
 991         .modify            = ltdb_modify,
 992         .del               = ltdb_delete,
 993         .rename            = ltdb_rename,
 994         .request           = ltdb_request,
 995         .start_transaction = ltdb_start_trans,
 996         .end_transaction   = ltdb_end_trans,
 997         .del_transaction   = ltdb_del_trans,
 998         .wait              = ltdb_wait,
 999         .sequence_number   = ltdb_sequence_number
1000 };
1001
1002 /*
1003   connect to the database
1004 */
1005 static int ltdb_connect(struct ldb_context *ldb, const char *url,
1006                         unsigned int flags, const char *options[],
1007                         struct ldb_module **module)
1008 {
1009         const char *path;
1010         int tdb_flags, open_flags;
1011         struct ltdb_private *ltdb;
1012
1013         /* parse the url */
1014         if (strchr(url, ':')) {
1015                 if (strncmp(url, "tdb://", 6) != 0) {
1016                         ldb_debug(ldb, LDB_DEBUG_ERROR, "Invalid tdb URL '%s'", url);
1017                         return -1;
1018                 }
1019                 path = url+6;
1020         } else {
1021                 path = url;
1022         }
1023
1024         tdb_flags = TDB_DEFAULT;
1025
1026         /* check for the 'nosync' option */
1027         if (flags & LDB_FLG_NOSYNC) {
1028                 tdb_flags |= TDB_NOSYNC;
1029         }
1030
1031         if (flags & LDB_FLG_RDONLY) {
1032                 open_flags = O_RDONLY;
1033         } else {
1034                 open_flags = O_CREAT | O_RDWR;
1035         }
1036
1037         ltdb = talloc_zero(ldb, struct ltdb_private);
1038         if (!ltdb) {
1039                 ldb_oom(ldb);
1040                 return -1;
1041         }
1042
1043         /* note that we use quite a large default hash size */
1044         ltdb->tdb = ltdb_wrap_open(ltdb, path, 10000,
1045                                    tdb_flags, open_flags,
1046                                    ldb->create_perms, ldb);
1047         if (!ltdb->tdb) {
1048                 ldb_debug(ldb, LDB_DEBUG_ERROR, "Unable to open tdb '%s'\n", path);
1049                 talloc_free(ltdb);
1050                 return -1;
1051         }
1052
1053         ltdb->sequence_number = 0;
1054
1055         *module = talloc(ldb, struct ldb_module);
1056         if (!module) {
1057                 ldb_oom(ldb);
1058                 talloc_free(ltdb);
1059                 return -1;
1060         }
1061         (*module)->ldb = ldb;
1062         (*module)->prev = (*module)->next = NULL;
1063         (*module)->private_data = ltdb;
1064         (*module)->ops = &ltdb_ops;
1065
1066         return 0;
1067 }
1068
1069 int ldb_tdb_init(void)
1070 {
1071         return ldb_register_backend("tdb", ltdb_connect);
1072 }