lib/dbwrap/dbwrap_ntdb.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Database interface wrapper around ntdb
   4    Copyright (C) Volker Lendecke 2005-2007
   5    Copyright (C) Rusty Russell 2012
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "dbwrap/dbwrap.h"
  23 #include "dbwrap/dbwrap_private.h"
  24 #include "dbwrap/dbwrap_ntdb.h"
  25 #include "system/filesys.h"
  26 #include "lib/util/util_ntdb.h"
  27 #include "ccan/str/str.h"
  28
  29 struct db_ntdb_ctx {
  30         struct ntdb_context *ntdb;
  31
  32         struct {
  33                 dev_t dev;
  34                 ino_t ino;
  35         } id;
  36 };
  37
  38 static int tdb_store_flag_to_ntdb(int tdb_flag)
  39 {
  40         switch (tdb_flag) {
  41         /* In fact, any value defaults to TDB_REPLACE in tdb! */
  42         case 0:
  43         case TDB_REPLACE:
  44                 return NTDB_REPLACE;
  45         case TDB_INSERT:
  46                 return NTDB_INSERT;
  47         case TDB_MODIFY:
  48                 return NTDB_MODIFY;
  49         default:
  50                 smb_panic("unknown tdb_flag");
  51         }
  52 }
  53
  54 static NTSTATUS db_ntdb_store(struct db_record *rec, NTDB_DATA data, int flag)
  55 {
  56         int ntdb_flag = tdb_store_flag_to_ntdb(flag);
  57         struct db_ntdb_ctx *ctx = talloc_get_type_abort(rec->private_data,
  58                                                         struct db_ntdb_ctx);
  59
  60         /*
  61          * This has a bug: We need to replace rec->value for correct
  62          * operation, but right now brlock and locking don't use the value
  63          * anymore after it was stored.
  64          */
  65
  66         if (ntdb_store(ctx->ntdb, rec->key, data, ntdb_flag) == NTDB_SUCCESS) {
  67                 return NT_STATUS_OK;
  68         }
  69         return NT_STATUS_UNSUCCESSFUL;
  70 }
  71
  72 static NTSTATUS db_ntdb_delete(struct db_record *rec)
  73 {
  74         enum NTDB_ERROR err;
  75         struct db_ntdb_ctx *ctx = talloc_get_type_abort(rec->private_data,
  76                                                        struct db_ntdb_ctx);
  77
  78         err = ntdb_delete(ctx->ntdb, rec->key);
  79         if (err == NTDB_SUCCESS) {
  80                 return NT_STATUS_OK;
  81         }
  82
  83         if (err == NTDB_ERR_NOEXIST) {
  84                 return NT_STATUS_NOT_FOUND;
  85         }
  86
  87         return NT_STATUS_UNSUCCESSFUL;
  88 }
  89
  90 static void db_ntdb_log_key(const char *prefix, NTDB_DATA key)
  91 {
  92         size_t len;
  93         char *keystr;
  94
  95         if (DEBUGLEVEL < 10) {
  96                 return;
  97         }
  98         len = key.dsize;
  99         if (DEBUGLEVEL == 10) {
 100                 /*
 101                  * Only fully spam at debuglevel > 10
 102                  */
 103                 len = MIN(10, key.dsize);
 104         }
 105         keystr = hex_encode_talloc(talloc_tos(), (unsigned char *)(key.dptr),
 106                                    len);
 107         DEBUG(10, ("%s key %s\n", prefix, keystr));
 108         TALLOC_FREE(keystr);
 109 }
 110
 111 static int db_ntdb_record_destr(struct db_record* data)
 112 {
 113         struct db_ntdb_ctx *ctx =
 114                 talloc_get_type_abort(data->private_data, struct db_ntdb_ctx);
 115
 116         db_ntdb_log_key("Unlocking", data->key);
 117         ntdb_chainunlock(ctx->ntdb, data->key);
 118         return 0;
 119 }
 120
 121 struct ntdb_fetch_locked_state {
 122         TALLOC_CTX *mem_ctx;
 123         struct db_record *result;
 124 };
 125
 126 static enum NTDB_ERROR db_ntdb_fetchlock_parse(NTDB_DATA key, NTDB_DATA data,
 127                                                struct ntdb_fetch_locked_state *state)
 128 {
 129         struct db_record *result;
 130
 131         result = (struct db_record *)talloc_size(
 132                 state->mem_ctx,
 133                 sizeof(struct db_record) + key.dsize + data.dsize);
 134
 135         if (result == NULL) {
 136                 return NTDB_ERR_OOM;
 137         }
 138         state->result = result;
 139
 140         result->key.dsize = key.dsize;
 141         result->key.dptr = ((uint8_t *)result) + sizeof(struct db_record);
 142         memcpy(result->key.dptr, key.dptr, key.dsize);
 143
 144         result->value.dsize = data.dsize;
 145
 146         if (data.dsize > 0) {
 147                 result->value.dptr = result->key.dptr+key.dsize;
 148                 memcpy(result->value.dptr, data.dptr, data.dsize);
 149         }
 150         else {
 151                 result->value.dptr = NULL;
 152         }
 153
 154         return NTDB_SUCCESS;
 155 }
 156
 157 static struct db_record *db_ntdb_fetch_locked_internal(
 158         struct db_context *db, TALLOC_CTX *mem_ctx, NTDB_DATA key)
 159 {
 160         struct db_ntdb_ctx *ctx = talloc_get_type_abort(db->private_data,
 161                                                         struct db_ntdb_ctx);
 162         struct ntdb_fetch_locked_state state;
 163         enum NTDB_ERROR err;
 164         NTDB_DATA null = { NULL, 0 };
 165
 166         state.mem_ctx = mem_ctx;
 167         state.result = NULL;
 168
 169         err = ntdb_parse_record(ctx->ntdb, key, db_ntdb_fetchlock_parse,
 170                                 &state);
 171         if (err != NTDB_SUCCESS && err != NTDB_ERR_NOEXIST) {
 172                 ntdb_chainunlock(ctx->ntdb, key);
 173                 return NULL;
 174         }
 175
 176         if (state.result == NULL) {
 177                 db_ntdb_fetchlock_parse(key, null, &state);
 178         }
 179
 180         if (state.result == NULL) {
 181                 ntdb_chainunlock(ctx->ntdb, key);
 182                 return NULL;
 183         }
 184
 185         talloc_set_destructor(state.result, db_ntdb_record_destr);
 186
 187         state.result->private_data = talloc_reference(state.result, ctx);
 188         state.result->store = db_ntdb_store;
 189         state.result->delete_rec = db_ntdb_delete;
 190
 191         DEBUG(10, ("Allocated locked data 0x%p\n", state.result));
 192
 193         return state.result;
 194 }
 195
 196 static struct db_record *db_ntdb_fetch_locked(
 197         struct db_context *db, TALLOC_CTX *mem_ctx, NTDB_DATA key)
 198 {
 199         struct db_ntdb_ctx *ctx = talloc_get_type_abort(db->private_data,
 200                                                        struct db_ntdb_ctx);
 201
 202         db_ntdb_log_key("Locking", key);
 203         if (ntdb_chainlock(ctx->ntdb, key) != 0) {
 204                 DEBUG(3, ("ntdb_chainlock failed\n"));
 205                 return NULL;
 206         }
 207         return db_ntdb_fetch_locked_internal(db, mem_ctx, key);
 208 }
 209
 210 /* Proxy which sets waitflag to false so we never block. */
 211 static int lock_nonblock(int fd, int rw, off_t off, off_t len, bool waitflag,
 212                          void *_orig)
 213 {
 214         struct ntdb_attribute_flock *orig = _orig;
 215
 216         return orig->lock(fd, rw, off, len, false, orig->data);
 217 }
 218
 219 static enum NTDB_ERROR enable_nonblock(struct ntdb_context *ntdb,
 220                                        union ntdb_attribute *orig)
 221 {
 222         union ntdb_attribute locking;
 223         enum NTDB_ERROR ecode;
 224
 225         orig->base.attr = NTDB_ATTRIBUTE_FLOCK;
 226         ecode = ntdb_get_attribute(ntdb, orig);
 227         if (ecode != NTDB_SUCCESS) {
 228                 return ecode;
 229         }
 230
 231         /* Replace locking function with our own. */
 232         locking = *orig;
 233         locking.flock.data = orig;
 234         locking.flock.lock = lock_nonblock;
 235
 236         return ntdb_set_attribute(ntdb, &locking);
 237 }
 238
 239 static void disable_nonblock(struct ntdb_context *ntdb)
 240 {
 241         ntdb_unset_attribute(ntdb, NTDB_ATTRIBUTE_FLOCK);
 242 }
 243
 244 static enum NTDB_ERROR ntdb_chainlock_nonblock(struct ntdb_context *ntdb,
 245                                                NTDB_DATA key)
 246 {
 247         union ntdb_attribute orig;
 248         enum NTDB_ERROR ecode;
 249
 250         ecode = enable_nonblock(ntdb, &orig);
 251         if (!ecode) {
 252                 ecode = ntdb_chainlock(ntdb, key);
 253                 disable_nonblock(ntdb);
 254         }
 255         return ecode;
 256 }
 257
 258 static struct db_record *db_ntdb_try_fetch_locked(
 259         struct db_context *db, TALLOC_CTX *mem_ctx, TDB_DATA key)
 260 {
 261         struct db_ntdb_ctx *ctx = talloc_get_type_abort(db->private_data,
 262                                                        struct db_ntdb_ctx);
 263
 264         db_ntdb_log_key("Trying to lock", key);
 265         if (ntdb_chainlock_nonblock(ctx->ntdb, key) != 0) {
 266                 DEBUG(3, ("ntdb_chainlock_nonblock failed\n"));
 267                 return NULL;
 268         }
 269         return db_ntdb_fetch_locked_internal(db, mem_ctx, key);
 270 }
 271
 272 static struct flock flock_struct;
 273
 274 /* Return a value which is none of v1, v2 or v3. */
 275 static inline short int invalid_value(short int v1, short int v2, short int v3)
 276 {
 277         short int try = (v1+v2+v3)^((v1+v2+v3) << 16);
 278         while (try == v1 || try == v2 || try == v3)
 279                 try++;
 280         return try;
 281 }
 282
 283 /* We invalidate in as many ways as we can, so the OS rejects it */
 284 static void invalidate_flock_struct(int signum)
 285 {
 286         flock_struct.l_type = invalid_value(F_RDLCK, F_WRLCK, F_UNLCK);
 287         flock_struct.l_whence = invalid_value(SEEK_SET, SEEK_CUR, SEEK_END);
 288         flock_struct.l_start = -1;
 289         /* A large negative. */
 290         flock_struct.l_len = (((off_t)1 << (sizeof(off_t)*CHAR_BIT - 1)) + 1);
 291 }
 292
 293 static int timeout_lock(int fd, int rw, off_t off, off_t len, bool waitflag,
 294                         void *_timeout)
 295 {
 296         int ret, saved_errno;
 297         unsigned int timeout = *(unsigned int *)_timeout;
 298
 299         flock_struct.l_type = rw;
 300         flock_struct.l_whence = SEEK_SET;
 301         flock_struct.l_start = off;
 302         flock_struct.l_len = len;
 303
 304         CatchSignal(SIGALRM, invalidate_flock_struct);
 305         alarm(timeout);
 306
 307         for (;;) {
 308                 if (waitflag)
 309                         ret = fcntl(fd, F_SETLKW, &flock_struct);
 310                 else
 311                         ret = fcntl(fd, F_SETLK, &flock_struct);
 312
 313                 if (ret == 0)
 314                         break;
 315
 316                 /* Not signalled?  Something else went wrong. */
 317                 if (flock_struct.l_len == len) {
 318                         if (errno == EAGAIN || errno == EINTR)
 319                                 continue;
 320                         saved_errno = errno;
 321                         break;
 322                 } else {
 323                         saved_errno = EINTR;
 324                         break;
 325                 }
 326         }
 327
 328         alarm(0);
 329         if (ret != 0) {
 330                 errno = saved_errno;
 331         }
 332         return ret;
 333 }
 334
 335 static int ntdb_chainlock_timeout(struct ntdb_context *ntdb,
 336                                   NTDB_DATA key,
 337                                   unsigned int timeout)
 338 {
 339         union ntdb_attribute locking;
 340         enum NTDB_ERROR ecode;
 341
 342         locking.base.attr = NTDB_ATTRIBUTE_FLOCK;
 343         ecode = ntdb_get_attribute(ntdb, &locking);
 344         if (ecode != NTDB_SUCCESS) {
 345                 return -1;
 346         }
 347
 348         /* Replace locking function with our own. */
 349         locking.flock.data = &timeout;
 350         locking.flock.lock = timeout_lock;
 351
 352         ecode = ntdb_set_attribute(ntdb, &locking);
 353         if (ecode != NTDB_SUCCESS) {
 354                 return -1;
 355         }
 356
 357         ecode = ntdb_chainlock(ntdb, key);
 358
 359         ntdb_unset_attribute(ntdb, NTDB_ATTRIBUTE_FLOCK);
 360         return ecode == NTDB_SUCCESS ? 0 : -1;
 361 }
 362
 363 static struct db_record *db_ntdb_fetch_locked_timeout(
 364         struct db_context *db, TALLOC_CTX *mem_ctx, TDB_DATA key,
 365         unsigned int timeout)
 366 {
 367         struct db_ntdb_ctx *ctx = talloc_get_type_abort(db->private_data,
 368                                                        struct db_ntdb_ctx);
 369
 370         db_ntdb_log_key("Trying to lock", key);
 371         if (ntdb_chainlock_timeout(ctx->ntdb, key, timeout) != 0) {
 372                 DEBUG(3, ("ntdb_chainlock_timeout failed\n"));
 373                 return NULL;
 374         }
 375         return db_ntdb_fetch_locked_internal(db, mem_ctx, key);
 376 }
 377
 378
 379 static int db_ntdb_exists(struct db_context *db, TDB_DATA key)
 380 {
 381         struct db_ntdb_ctx *ctx = talloc_get_type_abort(
 382                 db->private_data, struct db_ntdb_ctx);
 383         return ntdb_exists(ctx->ntdb, key);
 384 }
 385
 386 static int db_ntdb_wipe(struct db_context *db)
 387 {
 388         struct db_ntdb_ctx *ctx = talloc_get_type_abort(
 389                 db->private_data, struct db_ntdb_ctx);
 390         if (ntdb_wipe_all(ctx->ntdb) != NTDB_SUCCESS) {
 391                 return -1;
 392         }
 393         return 0;
 394 }
 395
 396 static int db_ntdb_check(struct db_context *db)
 397 {
 398         struct db_ntdb_ctx *ctx = talloc_get_type_abort(
 399                 db->private_data, struct db_ntdb_ctx);
 400         if (ntdb_check(ctx->ntdb, NULL, NULL) != NTDB_SUCCESS) {
 401                 return -1;
 402         }
 403         return 0;
 404 }
 405
 406 struct db_ntdb_parse_state {
 407         void (*parser)(TDB_DATA key, TDB_DATA data,
 408                        void *private_data);
 409         void *private_data;
 410 };
 411
 412 /*
 413  * ntdb_parse_record expects a parser returning enum NTDB_ERROR,
 414  * mixing up ntdb and parser errors. Wrap around that by always
 415  * returning NTDB_SUCCESS and have dbwrap_parse_record expect a parser
 416  * returning void.
 417  */
 418
 419 static enum NTDB_ERROR db_ntdb_parser(NTDB_DATA key, NTDB_DATA data,
 420                                       struct db_ntdb_parse_state *state)
 421 {
 422         state->parser(key, data, state->private_data);
 423         return TDB_SUCCESS;
 424 }
 425
 426 static NTSTATUS db_ntdb_parse(struct db_context *db, TDB_DATA key,
 427                               void (*parser)(TDB_DATA key, TDB_DATA data,
 428                                              void *private_data),
 429                               void *private_data)
 430 {
 431         struct db_ntdb_ctx *ctx = talloc_get_type_abort(
 432                 db->private_data, struct db_ntdb_ctx);
 433         struct db_ntdb_parse_state state;
 434         enum NTDB_ERROR err;
 435
 436         state.parser = parser;
 437         state.private_data = private_data;
 438
 439         err = ntdb_parse_record(ctx->ntdb, key, db_ntdb_parser, &state);
 440         return map_nt_error_from_ntdb(err);
 441 }
 442
 443 struct db_ntdb_traverse_ctx {
 444         struct db_context *db;
 445         int (*f)(struct db_record *rec, void *private_data);
 446         void *private_data;
 447 };
 448
 449 static int db_ntdb_traverse_func(struct ntdb_context *ntdb,
 450                                  NTDB_DATA kbuf, NTDB_DATA dbuf,
 451                                  struct db_ntdb_traverse_ctx *ctx)
 452 {
 453         struct db_record rec;
 454
 455         rec.key = kbuf;
 456         rec.value = dbuf;
 457         rec.store = db_ntdb_store;
 458         rec.delete_rec = db_ntdb_delete;
 459         rec.private_data = ctx->db->private_data;
 460         rec.db = ctx->db;
 461
 462         return ctx->f(&rec, ctx->private_data);
 463 }
 464
 465 static int db_ntdb_traverse(struct db_context *db,
 466                             int (*f)(struct db_record *rec, void *private_data),
 467                             void *private_data)
 468 {
 469         struct db_ntdb_ctx *db_ctx =
 470                 talloc_get_type_abort(db->private_data, struct db_ntdb_ctx);
 471         struct db_ntdb_traverse_ctx ctx;
 472         int64_t ret;
 473
 474         ctx.db = db;
 475         ctx.f = f;
 476         ctx.private_data = private_data;
 477         ret = ntdb_traverse(db_ctx->ntdb, db_ntdb_traverse_func, &ctx);
 478
 479         if (ret < 0) {
 480                 return -1;
 481         }
 482
 483         /* Make sure we don't truncate! */
 484         if ((int)ret != ret) {
 485                 ret = INT_MAX;
 486         }
 487         return ret;
 488 }
 489
 490 static NTSTATUS db_ntdb_store_deny(struct db_record *rec, NTDB_DATA data, int flag)
 491 {
 492         return NT_STATUS_MEDIA_WRITE_PROTECTED;
 493 }
 494
 495 static NTSTATUS db_ntdb_delete_deny(struct db_record *rec)
 496 {
 497         return NT_STATUS_MEDIA_WRITE_PROTECTED;
 498 }
 499
 500 static int db_ntdb_traverse_read_func(struct ntdb_context *ntdb,
 501                                       NTDB_DATA kbuf, NTDB_DATA dbuf,
 502                                       struct db_ntdb_traverse_ctx *ctx)
 503 {
 504         struct db_record rec;
 505
 506         rec.key = kbuf;
 507         rec.value = dbuf;
 508         rec.store = db_ntdb_store_deny;
 509         rec.delete_rec = db_ntdb_delete_deny;
 510         rec.private_data = ctx->db->private_data;
 511         rec.db = ctx->db;
 512
 513         return ctx->f(&rec, ctx->private_data);
 514 }
 515
 516 static int db_ntdb_traverse_read(struct db_context *db,
 517                                  int (*f)(struct db_record *rec,
 518                                           void *private_data),
 519                                  void *private_data)
 520 {
 521         struct db_ntdb_ctx *db_ctx =
 522                 talloc_get_type_abort(db->private_data, struct db_ntdb_ctx);
 523         struct db_ntdb_traverse_ctx ctx;
 524         int64_t ret;
 525
 526         ctx.db = db;
 527         ctx.f = f;
 528         ctx.private_data = private_data;
 529
 530         /* This is a bit of paranoia to check that f() isn't altering
 531          * database. */
 532         if (ntdb_get_flags(db_ctx->ntdb) & NTDB_RDONLY) {
 533                 ret = ntdb_traverse(db_ctx->ntdb, db_ntdb_traverse_read_func,
 534                                     &ctx);
 535         } else {
 536                 ntdb_add_flag(db_ctx->ntdb, NTDB_RDONLY);
 537                 ret = ntdb_traverse(db_ctx->ntdb, db_ntdb_traverse_read_func,
 538                                     &ctx);
 539                 ntdb_remove_flag(db_ctx->ntdb, NTDB_RDONLY);
 540         }
 541
 542         if (ret < 0) {
 543                 return -1;
 544         }
 545
 546         /* Make sure we don't truncate! */
 547         if ((int)ret != ret) {
 548                 ret = INT_MAX;
 549         }
 550         return ret;
 551 }
 552
 553 static int db_ntdb_get_seqnum(struct db_context *db)
 554
 555 {
 556         struct db_ntdb_ctx *db_ctx =
 557                 talloc_get_type_abort(db->private_data, struct db_ntdb_ctx);
 558         return ntdb_get_seqnum(db_ctx->ntdb);
 559 }
 560
 561 static int db_ntdb_transaction_start(struct db_context *db)
 562 {
 563         struct db_ntdb_ctx *db_ctx =
 564                 talloc_get_type_abort(db->private_data, struct db_ntdb_ctx);
 565         return ntdb_transaction_start(db_ctx->ntdb) == NTDB_SUCCESS ? 0 : -1;
 566 }
 567
 568 static NTSTATUS db_ntdb_transaction_start_nonblock(struct db_context *db)
 569 {
 570         union ntdb_attribute orig;
 571         enum NTDB_ERROR ecode;
 572         struct db_ntdb_ctx *db_ctx =
 573                 talloc_get_type_abort(db->private_data, struct db_ntdb_ctx);
 574
 575         ecode = enable_nonblock(db_ctx->ntdb, &orig);
 576         if (!ecode) {
 577                 ecode = ntdb_transaction_start(db_ctx->ntdb);
 578                 disable_nonblock(db_ctx->ntdb);
 579         }
 580         return map_nt_error_from_ntdb(ecode);
 581 }
 582
 583 static int db_ntdb_transaction_commit(struct db_context *db)
 584 {
 585         struct db_ntdb_ctx *db_ctx =
 586                 talloc_get_type_abort(db->private_data, struct db_ntdb_ctx);
 587         return ntdb_transaction_commit(db_ctx->ntdb) == NTDB_SUCCESS ? 0 : -1;
 588 }
 589
 590 static int db_ntdb_transaction_cancel(struct db_context *db)
 591 {
 592         struct db_ntdb_ctx *db_ctx =
 593                 talloc_get_type_abort(db->private_data, struct db_ntdb_ctx);
 594         ntdb_transaction_cancel(db_ctx->ntdb);
 595         return 0;
 596 }
 597
 598 static void db_ntdb_id(struct db_context *db, const uint8_t **id, size_t *idlen)
 599 {
 600         struct db_ntdb_ctx *db_ctx =
 601                 talloc_get_type_abort(db->private_data, struct db_ntdb_ctx);
 602         *id = (uint8_t *)&db_ctx->id;
 603         *idlen = sizeof(db_ctx->id);
 604 }
 605
 606 /* Don't ask this to open a .tdb file: dbwrap_local_open will catch that. */
 607 struct db_context *db_open_ntdb(TALLOC_CTX *mem_ctx,
 608                                 struct loadparm_context *lp_ctx,
 609                                 const char *ntdbname,
 610                                 int hash_size, int ntdb_flags,
 611                                 int open_flags, mode_t mode,
 612                                 enum dbwrap_lock_order lock_order)
 613 {
 614         struct db_context *result = NULL;
 615         struct db_ntdb_ctx *db_ntdb;
 616         struct stat st;
 617         union ntdb_attribute hattr;
 618
 619         if ((ntdb_flags & NTDB_INTERNAL) && !ntdbname) {
 620                 ntdbname = "unnamed";
 621         }
 622
 623         /* Extra paranoia. */
 624         if (strends(ntdbname, ".tdb")) {
 625                 DEBUG(0, ("can't try to open %s with ntdb!", ntdbname));
 626                 return NULL;
 627         }
 628
 629         /* We only use this if hsize is non-zero. */
 630         hattr.base.attr = NTDB_ATTRIBUTE_HASHSIZE;
 631         hattr.base.next = NULL;
 632         hattr.hashsize.size = hash_size;
 633
 634         result = talloc_zero(mem_ctx, struct db_context);
 635         if (result == NULL) {
 636                 DEBUG(0, ("talloc failed\n"));
 637                 goto fail;
 638         }
 639
 640         result->private_data = db_ntdb = talloc(result, struct db_ntdb_ctx);
 641         if (db_ntdb == NULL) {
 642                 DEBUG(0, ("talloc failed\n"));
 643                 goto fail;
 644         }
 645         result->lock_order = lock_order;
 646
 647         db_ntdb->ntdb = ntdb_new(db_ntdb, ntdbname, ntdb_flags,
 648                                  open_flags, mode,
 649                                  hash_size ? &hattr : NULL, lp_ctx);
 650         if (db_ntdb->ntdb == NULL) {
 651                 DEBUG(3, ("Could not open ntdb %s: %s\n",
 652                           ntdbname, strerror(errno)));
 653                 goto fail;
 654         }
 655
 656         ZERO_STRUCT(db_ntdb->id);
 657
 658         if (fstat(ntdb_fd(db_ntdb->ntdb), &st) == -1) {
 659                 DEBUG(3, ("fstat failed: %s\n", strerror(errno)));
 660                 goto fail;
 661         }
 662         db_ntdb->id.dev = st.st_dev;
 663         db_ntdb->id.ino = st.st_ino;
 664
 665         result->fetch_locked = db_ntdb_fetch_locked;
 666         result->fetch_locked_timeout = db_ntdb_fetch_locked_timeout;
 667         result->try_fetch_locked = db_ntdb_try_fetch_locked;
 668         result->traverse = db_ntdb_traverse;
 669         result->traverse_read = db_ntdb_traverse_read;
 670         result->parse_record = db_ntdb_parse;
 671         result->get_seqnum = db_ntdb_get_seqnum;
 672         result->persistent = ((ntdb_flags & NTDB_CLEAR_IF_FIRST) == 0);
 673         result->transaction_start = db_ntdb_transaction_start;
 674         result->transaction_start_nonblock = db_ntdb_transaction_start_nonblock;
 675         result->transaction_commit = db_ntdb_transaction_commit;
 676         result->transaction_cancel = db_ntdb_transaction_cancel;
 677         result->exists = db_ntdb_exists;
 678         result->wipe = db_ntdb_wipe;
 679         result->id = db_ntdb_id;
 680         result->check = db_ntdb_check;
 681         result->stored_callback = NULL;
 682         result->name = ntdb_name(db_ntdb->ntdb);
 683         result->hash_size = hash_size;
 684         return result;
 685
 686  fail:
 687         if (result != NULL) {
 688                 TALLOC_FREE(result);
 689         }
 690         return NULL;
 691 }