source/registry/reg_backend_db.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  Virtual Windows Registry Layer
   4  *  Copyright (C) Gerald Carter                     2002-2005
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 /* Implementation of internal registry database functions. */
  21
  22 #include "includes.h"
  23
  24 #undef DBGC_CLASS
  25 #define DBGC_CLASS DBGC_REGISTRY
  26
  27 static struct db_context *regdb = NULL;
  28 static int regdb_refcount;
  29
  30 static bool regdb_key_exists(const char *key);
  31 static bool regdb_key_is_base_key(const char *key);
  32
  33 /* List the deepest path into the registry.  All part components will be created.*/
  34
  35 /* If you want to have a part of the path controlled by the tdb and part by
  36    a virtual registry db (e.g. printing), then you have to list the deepest path.
  37    For example,"HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion/Print"
  38    allows the reg_db backend to handle everything up to
  39    "HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion" and then we'll hook
  40    the reg_printing backend onto the last component of the path (see
  41    KEY_PRINTING_2K in include/rpc_reg.h)   --jerry */
  42
  43 static const char *builtin_registry_paths[] = {
  44         KEY_PRINTING_2K,
  45         KEY_PRINTING_PORTS,
  46         KEY_PRINTING,
  47         KEY_SHARES,
  48         KEY_EVENTLOG,
  49         KEY_SMBCONF,
  50         KEY_PERFLIB,
  51         KEY_PERFLIB_009,
  52         KEY_GROUP_POLICY,
  53         KEY_SAMBA_GROUP_POLICY,
  54         KEY_GP_MACHINE_POLICY,
  55         KEY_GP_MACHINE_WIN_POLICY,
  56         KEY_HKCU,
  57         KEY_GP_USER_POLICY,
  58         KEY_GP_USER_WIN_POLICY,
  59         KEY_WINLOGON_GPEXT_PATH,
  60         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Print\\Monitors",
  61         KEY_PROD_OPTIONS,
  62         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Terminal Server\\DefaultUserConfiguration",
  63         KEY_TCPIP_PARAMS,
  64         KEY_NETLOGON_PARAMS,
  65         KEY_HKU,
  66         KEY_HKCR,
  67         KEY_HKPD,
  68         KEY_HKPT,
  69          NULL };
  70
  71 struct builtin_regkey_value {
  72         const char *path;
  73         const char *valuename;
  74         uint32 type;
  75         union {
  76                 const char *string;
  77                 uint32 dw_value;
  78         } data;
  79 };
  80
  81 static struct builtin_regkey_value builtin_registry_values[] = {
  82         { KEY_PRINTING_PORTS,
  83                 SAMBA_PRINTER_PORT_NAME, REG_SZ, { "" } },
  84         { KEY_PRINTING_2K,
  85                 "DefaultSpoolDirectory", REG_SZ, { "C:\\Windows\\System32\\Spool\\Printers" } },
  86         { KEY_EVENTLOG,
  87                 "DisplayName", REG_SZ, { "Event Log" } },
  88         { KEY_EVENTLOG,
  89                 "ErrorControl", REG_DWORD, { (char*)0x00000001 } },
  90         { NULL, NULL, 0, { NULL } }
  91 };
  92
  93 /**
  94  * Initialize a key in the registry:
  95  * create each component key of the specified path.
  96  */
  97 static WERROR init_registry_key_internal(const char *add_path)
  98 {
  99         WERROR werr;
 100         TALLOC_CTX *frame = talloc_stackframe();
 101         char *path = NULL;
 102         char *base = NULL;
 103         char *remaining = NULL;
 104         char *keyname;
 105         char *subkeyname;
 106         struct regsubkey_ctr *subkeys;
 107         const char *p, *p2;
 108
 109         DEBUG(6, ("init_registry_key: Adding [%s]\n", add_path));
 110
 111         path = talloc_strdup(frame, add_path);
 112         base = talloc_strdup(frame, "");
 113         if (!path || !base) {
 114                 werr = WERR_NOMEM;
 115                 goto fail;
 116         }
 117         p = path;
 118
 119         while (next_token_talloc(frame, &p, &keyname, "\\")) {
 120
 121                 /* build up the registry path from the components */
 122
 123                 if (*base) {
 124                         base = talloc_asprintf(frame, "%s\\", base);
 125                         if (!base) {
 126                                 werr = WERR_NOMEM;
 127                                 goto fail;
 128                         }
 129                 }
 130                 base = talloc_asprintf_append(base, "%s", keyname);
 131                 if (!base) {
 132                         werr = WERR_NOMEM;
 133                         goto fail;
 134                 }
 135
 136                 /* get the immediate subkeyname (if we have one ) */
 137
 138                 subkeyname = talloc_strdup(frame, "");
 139                 if (!subkeyname) {
 140                         werr = WERR_NOMEM;
 141                         goto fail;
 142                 }
 143                 if (*p) {
 144                         remaining = talloc_strdup(frame, p);
 145                         if (!remaining) {
 146                                 werr = WERR_NOMEM;
 147                                 goto fail;
 148                         }
 149                         p2 = remaining;
 150
 151                         if (!next_token_talloc(frame, &p2,
 152                                                 &subkeyname, "\\"))
 153                         {
 154                                 subkeyname = talloc_strdup(frame,p2);
 155                                 if (!subkeyname) {
 156                                         werr = WERR_NOMEM;
 157                                         goto fail;
 158                                 }
 159                         }
 160                 }
 161
 162                 DEBUG(10,("init_registry_key: Storing key [%s] with "
 163                           "subkey [%s]\n", base,
 164                           *subkeyname ? subkeyname : "NULL"));
 165
 166                 /* we don't really care if the lookup succeeds or not
 167                  * since we are about to update the record.
 168                  * We just want any subkeys already present */
 169
 170                 werr = regsubkey_ctr_init(frame, &subkeys);
 171                 if (!W_ERROR_IS_OK(werr)) {
 172                         DEBUG(0,("talloc() failure!\n"));
 173                         goto fail;
 174                 }
 175
 176                 regdb_fetch_keys(base, subkeys);
 177                 if (*subkeyname) {
 178                         werr = regsubkey_ctr_addkey(subkeys, subkeyname);
 179                         if (!W_ERROR_IS_OK(werr)) {
 180                                 goto fail;
 181                         }
 182                 }
 183                 if (!regdb_store_keys( base, subkeys)) {
 184                         werr = WERR_CAN_NOT_COMPLETE;
 185                         goto fail;
 186                 }
 187         }
 188
 189         werr = WERR_OK;
 190
 191 fail:
 192         TALLOC_FREE(frame);
 193         return werr;
 194 }
 195
 196 /**
 197  * Initialize a key in the registry:
 198  * create each component key of the specified path,
 199  * wrapped in one db transaction.
 200  */
 201 WERROR init_registry_key(const char *add_path)
 202 {
 203         WERROR werr;
 204
 205         if (regdb_key_exists(add_path)) {
 206                 return WERR_OK;
 207         }
 208
 209         if (regdb->transaction_start(regdb) != 0) {
 210                 DEBUG(0, ("init_registry_key: transaction_start failed\n"));
 211                 return WERR_REG_IO_FAILURE;
 212         }
 213
 214         werr = init_registry_key_internal(add_path);
 215         if (!W_ERROR_IS_OK(werr)) {
 216                 goto fail;
 217         }
 218
 219         if (regdb->transaction_commit(regdb) != 0) {
 220                 DEBUG(0, ("init_registry_key: Could not commit transaction\n"));
 221                 return WERR_REG_IO_FAILURE;
 222         }
 223
 224         return WERR_OK;
 225
 226 fail:
 227         if (regdb->transaction_cancel(regdb) != 0) {
 228                 smb_panic("init_registry_key: transaction_cancel failed\n");
 229         }
 230
 231         return werr;
 232 }
 233
 234 /***********************************************************************
 235  Open the registry data in the tdb
 236  ***********************************************************************/
 237
 238 WERROR init_registry_data(void)
 239 {
 240         WERROR werr;
 241         TALLOC_CTX *frame = talloc_stackframe();
 242         REGVAL_CTR *values;
 243         int i;
 244         UNISTR2 data;
 245
 246         /*
 247          * First, check for the existence of the needed keys and values.
 248          * If all do already exist, we can save the writes.
 249          */
 250         for (i=0; builtin_registry_paths[i] != NULL; i++) {
 251                 if (!regdb_key_exists(builtin_registry_paths[i])) {
 252                         goto do_init;
 253                 }
 254         }
 255
 256         for (i=0; builtin_registry_values[i].path != NULL; i++) {
 257                 values = TALLOC_ZERO_P(frame, REGVAL_CTR);
 258                 if (values == NULL) {
 259                         werr = WERR_NOMEM;
 260                         goto done;
 261                 }
 262
 263                 regdb_fetch_values(builtin_registry_values[i].path, values);
 264                 if (!regval_ctr_key_exists(values,
 265                                         builtin_registry_values[i].valuename))
 266                 {
 267                         TALLOC_FREE(values);
 268                         goto do_init;
 269                 }
 270
 271                 TALLOC_FREE(values);
 272         }
 273
 274         werr = WERR_OK;
 275         goto done;
 276
 277 do_init:
 278
 279         /*
 280          * There are potentially quite a few store operations which are all
 281          * indiviually wrapped in tdb transactions. Wrapping them in a single
 282          * transaction gives just a single transaction_commit() to actually do
 283          * its fsync()s. See tdb/common/transaction.c for info about nested
 284          * transaction behaviour.
 285          */
 286
 287         if (regdb->transaction_start(regdb) != 0) {
 288                 DEBUG(0, ("init_registry_data: tdb_transaction_start "
 289                           "failed\n"));
 290                 werr = WERR_REG_IO_FAILURE;
 291                 goto done;
 292         }
 293
 294         /* loop over all of the predefined paths and add each component */
 295
 296         for (i=0; builtin_registry_paths[i] != NULL; i++) {
 297                 if (regdb_key_exists(builtin_registry_paths[i])) {
 298                         continue;
 299                 }
 300                 werr = init_registry_key_internal(builtin_registry_paths[i]);
 301                 if (!W_ERROR_IS_OK(werr)) {
 302                         goto fail;
 303                 }
 304         }
 305
 306         /* loop over all of the predefined values and add each component */
 307
 308         for (i=0; builtin_registry_values[i].path != NULL; i++) {
 309
 310                 values = TALLOC_ZERO_P(frame, REGVAL_CTR);
 311                 if (values == NULL) {
 312                         werr = WERR_NOMEM;
 313                         goto fail;
 314                 }
 315
 316                 regdb_fetch_values(builtin_registry_values[i].path, values);
 317
 318                 /* preserve existing values across restarts. Only add new ones */
 319
 320                 if (!regval_ctr_key_exists(values,
 321                                         builtin_registry_values[i].valuename))
 322                 {
 323                         switch(builtin_registry_values[i].type) {
 324                         case REG_DWORD:
 325                                 regval_ctr_addvalue(values,
 326                                         builtin_registry_values[i].valuename,
 327                                         REG_DWORD,
 328                                         (char*)&builtin_registry_values[i].data.dw_value,
 329                                         sizeof(uint32));
 330                                 break;
 331
 332                         case REG_SZ:
 333                                 init_unistr2(&data,
 334                                         builtin_registry_values[i].data.string,
 335                                         UNI_STR_TERMINATE);
 336                                 regval_ctr_addvalue(values,
 337                                         builtin_registry_values[i].valuename,
 338                                         REG_SZ,
 339                                         (char*)data.buffer,
 340                                         data.uni_str_len*sizeof(uint16));
 341                                 break;
 342
 343                         default:
 344                                 DEBUG(0, ("init_registry_data: invalid value "
 345                                           "type in builtin_registry_values "
 346                                           "[%d]\n",
 347                                           builtin_registry_values[i].type));
 348                         }
 349                         regdb_store_values(builtin_registry_values[i].path,
 350                                            values);
 351                 }
 352                 TALLOC_FREE(values);
 353         }
 354
 355         if (regdb->transaction_commit(regdb) != 0) {
 356                 DEBUG(0, ("init_registry_data: Could not commit "
 357                           "transaction\n"));
 358                 werr = WERR_REG_IO_FAILURE;
 359         } else {
 360                 werr = WERR_OK;
 361         }
 362
 363         goto done;
 364
 365 fail:
 366         if (regdb->transaction_cancel(regdb) != 0) {
 367                 smb_panic("init_registry_data: tdb_transaction_cancel "
 368                           "failed\n");
 369         }
 370
 371 done:
 372         TALLOC_FREE(frame);
 373         return werr;
 374 }
 375
 376 /***********************************************************************
 377  Open the registry database
 378  ***********************************************************************/
 379
 380 WERROR regdb_init(void)
 381 {
 382         const char *vstring = "INFO/version";
 383         uint32 vers_id;
 384         WERROR werr;
 385
 386         if (regdb) {
 387                 DEBUG(10, ("regdb_init: incrementing refcount (%d)\n",
 388                           regdb_refcount));
 389                 regdb_refcount++;
 390                 return WERR_OK;
 391         }
 392
 393         regdb = db_open(NULL, state_path("registry.tdb"), 0,
 394                               REG_TDB_FLAGS, O_RDWR, 0600);
 395         if (!regdb) {
 396                 regdb = db_open(NULL, state_path("registry.tdb"), 0,
 397                                       REG_TDB_FLAGS, O_RDWR|O_CREAT, 0600);
 398                 if (!regdb) {
 399                         werr = ntstatus_to_werror(map_nt_error_from_unix(errno));
 400                         DEBUG(1,("regdb_init: Failed to open registry %s (%s)\n",
 401                                 state_path("registry.tdb"), strerror(errno) ));
 402                         return werr;
 403                 }
 404
 405                 DEBUG(10,("regdb_init: Successfully created registry tdb\n"));
 406         }
 407
 408         regdb_refcount = 1;
 409
 410         vers_id = dbwrap_fetch_int32(regdb, vstring);
 411
 412         if ( vers_id != REGVER_V1 ) {
 413                 NTSTATUS status;
 414                 /* any upgrade code here if needed */
 415                 DEBUG(10, ("regdb_init: got %s = %d != %d\n", vstring,
 416                            vers_id, REGVER_V1));
 417                 status = dbwrap_trans_store_int32(regdb, vstring, REGVER_V1);
 418                 if (!NT_STATUS_IS_OK(status)) {
 419                         DEBUG(1, ("regdb_init: error storing %s = %d: %s\n",
 420                                   vstring, REGVER_V1, nt_errstr(status)));
 421                         return ntstatus_to_werror(status);
 422                 } else {
 423                         DEBUG(10, ("regdb_init: stored %s = %d\n",
 424                                   vstring, REGVER_V1));
 425                 }
 426         }
 427
 428         return WERR_OK;
 429 }
 430
 431 /***********************************************************************
 432  Open the registry.  Must already have been initialized by regdb_init()
 433  ***********************************************************************/
 434
 435 WERROR regdb_open( void )
 436 {
 437         WERROR result = WERR_OK;
 438
 439         if ( regdb ) {
 440                 DEBUG(10,("regdb_open: incrementing refcount (%d)\n", regdb_refcount));
 441                 regdb_refcount++;
 442                 return WERR_OK;
 443         }
 444
 445         become_root();
 446
 447         regdb = db_open(NULL, state_path("registry.tdb"), 0,
 448                               REG_TDB_FLAGS, O_RDWR, 0600);
 449         if ( !regdb ) {
 450                 result = ntstatus_to_werror( map_nt_error_from_unix( errno ) );
 451                 DEBUG(0,("regdb_open: Failed to open %s! (%s)\n",
 452                         state_path("registry.tdb"), strerror(errno) ));
 453         }
 454
 455         unbecome_root();
 456
 457         regdb_refcount = 1;
 458         DEBUG(10,("regdb_open: refcount reset (%d)\n", regdb_refcount));
 459
 460         return result;
 461 }
 462
 463 /***********************************************************************
 464  ***********************************************************************/
 465
 466 int regdb_close( void )
 467 {
 468         if (regdb_refcount == 0) {
 469                 return 0;
 470         }
 471
 472         regdb_refcount--;
 473
 474         DEBUG(10,("regdb_close: decrementing refcount (%d)\n", regdb_refcount));
 475
 476         if ( regdb_refcount > 0 )
 477                 return 0;
 478
 479         SMB_ASSERT( regdb_refcount >= 0 );
 480
 481         TALLOC_FREE(regdb);
 482         return 0;
 483 }
 484
 485 WERROR regdb_transaction_start(void)
 486 {
 487         return (regdb->transaction_start(regdb) == 0) ?
 488                 WERR_OK : WERR_REG_IO_FAILURE;
 489 }
 490
 491 WERROR regdb_transaction_commit(void)
 492 {
 493         return (regdb->transaction_commit(regdb) == 0) ?
 494                 WERR_OK : WERR_REG_IO_FAILURE;
 495 }
 496
 497 WERROR regdb_transaction_cancel(void)
 498 {
 499         return (regdb->transaction_cancel(regdb) == 0) ?
 500                 WERR_OK : WERR_REG_IO_FAILURE;
 501 }
 502
 503 /***********************************************************************
 504  return the tdb sequence number of the registry tdb.
 505  this is an indicator for the content of the registry
 506  having changed. it will change upon regdb_init, too, though.
 507  ***********************************************************************/
 508 int regdb_get_seqnum(void)
 509 {
 510         return regdb->get_seqnum(regdb);
 511 }
 512
 513
 514 static WERROR regdb_delete_key_with_prefix(const char *keyname,
 515                                            const char *prefix)
 516 {
 517         char *path;
 518         WERROR werr = WERR_NOMEM;
 519         TALLOC_CTX *mem_ctx = talloc_stackframe();
 520
 521         if (keyname == NULL) {
 522                 werr = WERR_INVALID_PARAM;
 523                 goto done;
 524         }
 525
 526         if (prefix == NULL) {
 527                 path = discard_const_p(char, keyname);
 528         } else {
 529                 path = talloc_asprintf(mem_ctx, "%s/%s", prefix, keyname);
 530                 if (path == NULL) {
 531                         goto done;
 532                 }
 533         }
 534
 535         path = normalize_reg_path(mem_ctx, path);
 536         if (path == NULL) {
 537                 goto done;
 538         }
 539
 540         werr = ntstatus_to_werror(dbwrap_delete_bystring(regdb, path));
 541
 542         /* treat "not" found" as ok */
 543         if (W_ERROR_EQUAL(werr, WERR_NOT_FOUND)) {
 544                 werr = WERR_OK;
 545         }
 546
 547 done:
 548         talloc_free(mem_ctx);
 549         return werr;
 550 }
 551
 552
 553 static WERROR regdb_delete_values(const char *keyname)
 554 {
 555         return regdb_delete_key_with_prefix(keyname, REG_VALUE_PREFIX);
 556 }
 557
 558 static WERROR regdb_delete_secdesc(const char *keyname)
 559 {
 560         return regdb_delete_key_with_prefix(keyname, REG_SECDESC_PREFIX);
 561 }
 562
 563 static WERROR regdb_delete_subkeylist(const char *keyname)
 564 {
 565         return regdb_delete_key_with_prefix(keyname, NULL);
 566 }
 567
 568 /***********************************************************************
 569  Add subkey strings to the registry tdb under a defined key
 570  fmt is the same format as tdb_pack except this function only supports
 571  fstrings
 572  ***********************************************************************/
 573
 574 static bool regdb_store_keys_internal(const char *key, struct regsubkey_ctr *ctr)
 575 {
 576         TDB_DATA dbuf;
 577         uint8 *buffer = NULL;
 578         int i = 0;
 579         uint32 len, buflen;
 580         bool ret = true;
 581         uint32 num_subkeys = regsubkey_ctr_numkeys(ctr);
 582         char *keyname = NULL;
 583         TALLOC_CTX *ctx = talloc_stackframe();
 584         NTSTATUS status;
 585
 586         if (!key) {
 587                 return false;
 588         }
 589
 590         keyname = talloc_strdup(ctx, key);
 591         if (!keyname) {
 592                 return false;
 593         }
 594         keyname = normalize_reg_path(ctx, keyname);
 595
 596         /* allocate some initial memory */
 597
 598         buffer = (uint8 *)SMB_MALLOC(1024);
 599         if (buffer == NULL) {
 600                 return false;
 601         }
 602         buflen = 1024;
 603         len = 0;
 604
 605         /* store the number of subkeys */
 606
 607         len += tdb_pack(buffer+len, buflen-len, "d", num_subkeys);
 608
 609         /* pack all the strings */
 610
 611         for (i=0; i<num_subkeys; i++) {
 612                 size_t thistime;
 613
 614                 thistime = tdb_pack(buffer+len, buflen-len, "f",
 615                                     regsubkey_ctr_specific_key(ctr, i));
 616                 if (len+thistime > buflen) {
 617                         size_t thistime2;
 618                         /*
 619                          * tdb_pack hasn't done anything because of the short
 620                          * buffer, allocate extra space.
 621                          */
 622                         buffer = SMB_REALLOC_ARRAY(buffer, uint8_t,
 623                                                    (len+thistime)*2);
 624                         if(buffer == NULL) {
 625                                 DEBUG(0, ("regdb_store_keys: Failed to realloc "
 626                                           "memory of size [%u]\n",
 627                                           (unsigned int)(len+thistime)*2));
 628                                 ret = false;
 629                                 goto done;
 630                         }
 631                         buflen = (len+thistime)*2;
 632                         thistime2 = tdb_pack(
 633                                 buffer+len, buflen-len, "f",
 634                                 regsubkey_ctr_specific_key(ctr, i));
 635                         if (thistime2 != thistime) {
 636                                 DEBUG(0, ("tdb_pack failed\n"));
 637                                 ret = false;
 638                                 goto done;
 639                         }
 640                 }
 641                 len += thistime;
 642         }
 643
 644         /* finally write out the data */
 645
 646         dbuf.dptr = buffer;
 647         dbuf.dsize = len;
 648         status = dbwrap_store_bystring(regdb, keyname, dbuf, TDB_REPLACE);
 649         if (!NT_STATUS_IS_OK(status)) {
 650                 ret = false;
 651                 goto done;
 652         }
 653
 654         /*
 655          * Delete a sorted subkey cache for regdb_key_exists, will be
 656          * recreated automatically
 657          */
 658         keyname = talloc_asprintf(ctx, "%s/%s", REG_SORTED_SUBKEYS_PREFIX,
 659                                   keyname);
 660         if (keyname != NULL) {
 661                 dbwrap_delete_bystring(regdb, keyname);
 662         }
 663
 664 done:
 665         TALLOC_FREE(ctx);
 666         SAFE_FREE(buffer);
 667         return ret;
 668 }
 669
 670 /***********************************************************************
 671  Store the new subkey record and create any child key records that
 672  do not currently exist
 673  ***********************************************************************/
 674
 675 bool regdb_store_keys(const char *key, struct regsubkey_ctr *ctr)
 676 {
 677         int num_subkeys, old_num_subkeys, i;
 678         char *path = NULL;
 679         struct regsubkey_ctr *subkeys = NULL, *old_subkeys = NULL;
 680         char *oldkeyname = NULL;
 681         TALLOC_CTX *ctx = talloc_stackframe();
 682         WERROR werr;
 683
 684         if (!regdb_key_is_base_key(key) && !regdb_key_exists(key)) {
 685                 goto fail;
 686         }
 687
 688         /*
 689          * fetch a list of the old subkeys so we can determine if anything has
 690          * changed
 691          */
 692
 693         werr = regsubkey_ctr_init(ctx, &old_subkeys);
 694         if (!W_ERROR_IS_OK(werr)) {
 695                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 696                 return false;
 697         }
 698
 699         regdb_fetch_keys(key, old_subkeys);
 700
 701         num_subkeys = regsubkey_ctr_numkeys(ctr);
 702         old_num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
 703         if ((num_subkeys && old_num_subkeys) &&
 704             (num_subkeys == old_num_subkeys)) {
 705
 706                 for (i = 0; i < num_subkeys; i++) {
 707                         if (strcmp(regsubkey_ctr_specific_key(ctr, i),
 708                                    regsubkey_ctr_specific_key(old_subkeys, i))
 709                             != 0)
 710                         {
 711                                 break;
 712                         }
 713                 }
 714                 if (i == num_subkeys) {
 715                         /*
 716                          * Nothing changed, no point to even start a tdb
 717                          * transaction
 718                          */
 719                         TALLOC_FREE(old_subkeys);
 720                         return true;
 721                 }
 722         }
 723
 724         TALLOC_FREE(old_subkeys);
 725
 726         if (regdb->transaction_start(regdb) != 0) {
 727                 DEBUG(0, ("regdb_store_keys: transaction_start failed\n"));
 728                 goto fail;
 729         }
 730
 731         /*
 732          * Re-fetch the old keys inside the transaction
 733          */
 734
 735         werr = regsubkey_ctr_init(ctx, &old_subkeys);
 736         if (!W_ERROR_IS_OK(werr)) {
 737                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 738                 goto cancel;
 739         }
 740
 741         regdb_fetch_keys(key, old_subkeys);
 742
 743         /*
 744          * Make the store operation as safe as possible without transactions:
 745          *
 746          * (1) For each subkey removed from ctr compared with old_subkeys:
 747          *
 748          *     (a) First delete the value db entry.
 749          *
 750          *     (b) Next delete the secdesc db record.
 751          *
 752          *     (c) Then delete the subkey list entry.
 753          *
 754          * (2) Now write the list of subkeys of the parent key,
 755          *     deleting removed entries and adding new ones.
 756          *
 757          * (3) Finally create the subkey list entries for the added keys.
 758          *
 759          * This way if we crash half-way in between deleting the subkeys
 760          * and storing the parent's list of subkeys, no old data can pop up
 761          * out of the blue when re-adding keys later on.
 762          */
 763
 764         /* (1) delete removed keys' lists (values/secdesc/subkeys) */
 765
 766         num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
 767         for (i=0; i<num_subkeys; i++) {
 768                 oldkeyname = regsubkey_ctr_specific_key(old_subkeys, i);
 769
 770                 if (regsubkey_ctr_key_exists(ctr, oldkeyname)) {
 771                         /*
 772                          * It's still around, don't delete
 773                          */
 774
 775                         continue;
 776                 }
 777
 778                 path = talloc_asprintf(ctx, "%s/%s", key, oldkeyname);
 779                 if (!path) {
 780                         goto cancel;
 781                 }
 782                 path = normalize_reg_path(ctx, path);
 783                 if (!path) {
 784                         goto cancel;
 785                 }
 786
 787                 /* (a) Delete the value list for this key */
 788
 789                 werr = regdb_delete_values(path);
 790                 if (!W_ERROR_IS_OK(werr)) {
 791                         DEBUG(1, (__location__ " Deleting %s/%s failed: %s\n",
 792                                   REG_VALUE_PREFIX, path, dos_errstr(werr)));
 793                         goto cancel;
 794                 }
 795
 796                 /* (b) Delete the secdesc for this key */
 797
 798                 werr = regdb_delete_secdesc(path);
 799                 if (!W_ERROR_IS_OK(werr)) {
 800                         DEBUG(1, (__location__ " Deleting %s/%s failed: %s\n",
 801                                   REG_SECDESC_PREFIX, path, dos_errstr(werr)));
 802                         goto cancel;
 803                 }
 804
 805                 /* (c) Delete the list of subkeys of this key */
 806
 807                 werr = regdb_delete_subkeylist(path);
 808                 if (!W_ERROR_IS_OK(werr)) {
 809                         DEBUG(1, (__location__ " Deleting %s failed: %s\n",
 810                                   path, dos_errstr(werr)));
 811                         goto cancel;
 812                 }
 813
 814                 TALLOC_FREE(path);
 815         }
 816
 817         TALLOC_FREE(old_subkeys);
 818
 819         /* (2) store the subkey list for the parent */
 820
 821         if (!regdb_store_keys_internal(key, ctr) ) {
 822                 DEBUG(0,("regdb_store_keys: Failed to store new subkey list "
 823                          "for parent [%s]\n", key));
 824                 goto cancel;
 825         }
 826
 827         /* (3) now create records for any subkeys that don't already exist */
 828
 829         num_subkeys = regsubkey_ctr_numkeys(ctr);
 830
 831         if (num_subkeys == 0) {
 832                 werr = regsubkey_ctr_init(ctx, &subkeys);
 833                 if (!W_ERROR_IS_OK(werr)) {
 834                         DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 835                         goto cancel;
 836                 }
 837
 838                 if (!regdb_store_keys_internal(key, subkeys)) {
 839                         DEBUG(0,("regdb_store_keys: Failed to store "
 840                                  "new record for key [%s]\n", key));
 841                         goto cancel;
 842                 }
 843                 TALLOC_FREE(subkeys);
 844
 845         }
 846
 847         for (i=0; i<num_subkeys; i++) {
 848                 path = talloc_asprintf(ctx, "%s/%s",
 849                                         key,
 850                                         regsubkey_ctr_specific_key(ctr, i));
 851                 if (!path) {
 852                         goto cancel;
 853                 }
 854                 werr = regsubkey_ctr_init(ctx, &subkeys);
 855                 if (!W_ERROR_IS_OK(werr)) {
 856                         DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 857                         goto cancel;
 858                 }
 859
 860                 if (regdb_fetch_keys( path, subkeys ) == -1) {
 861                         /* create a record with 0 subkeys */
 862                         if (!regdb_store_keys_internal(path, subkeys)) {
 863                                 DEBUG(0,("regdb_store_keys: Failed to store "
 864                                          "new record for key [%s]\n", path));
 865                                 goto cancel;
 866                         }
 867                 }
 868
 869                 TALLOC_FREE(subkeys);
 870                 TALLOC_FREE(path);
 871         }
 872
 873         if (regdb->transaction_commit(regdb) != 0) {
 874                 DEBUG(0, ("regdb_store_keys: Could not commit transaction\n"));
 875                 goto fail;
 876         }
 877
 878         TALLOC_FREE(ctx);
 879         return true;
 880
 881 cancel:
 882         if (regdb->transaction_cancel(regdb) != 0) {
 883                 smb_panic("regdb_store_keys: transaction_cancel failed\n");
 884         }
 885
 886 fail:
 887         TALLOC_FREE(ctx);
 888
 889         return false;
 890 }
 891
 892 static WERROR regdb_create_subkey(const char *key, const char *subkey)
 893 {
 894         WERROR werr;
 895         struct regsubkey_ctr *subkeys;
 896         TALLOC_CTX *mem_ctx = talloc_stackframe();
 897
 898         if (!regdb_key_is_base_key(key) && !regdb_key_exists(key)) {
 899                 werr = WERR_NOT_FOUND;
 900                 goto done;
 901         }
 902
 903         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
 904         W_ERROR_NOT_OK_GOTO_DONE(werr);
 905
 906         if (regdb_fetch_keys(key, subkeys) < 0) {
 907                 werr = WERR_REG_IO_FAILURE;
 908                 goto done;
 909         }
 910
 911         if (regsubkey_ctr_key_exists(subkeys, subkey)) {
 912                 werr = WERR_OK;
 913                 goto done;
 914         }
 915
 916         talloc_free(subkeys);
 917
 918         werr = regdb_transaction_start();
 919         W_ERROR_NOT_OK_GOTO_DONE(werr);
 920
 921         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
 922         W_ERROR_NOT_OK_GOTO(werr, cancel);
 923
 924         if (regdb_fetch_keys(key, subkeys) < 0) {
 925                 werr = WERR_REG_IO_FAILURE;
 926                 goto cancel;
 927         }
 928
 929         werr = regsubkey_ctr_addkey(subkeys, subkey);
 930         W_ERROR_NOT_OK_GOTO(werr, cancel);
 931
 932         if (!regdb_store_keys_internal(key, subkeys)) {
 933                 DEBUG(0, (__location__ " failed to store new subkey list for "
 934                          "parent key %s\n", key));
 935                 werr = WERR_REG_IO_FAILURE;
 936                 goto cancel;
 937         }
 938
 939         werr = regdb_transaction_commit();
 940         if (!W_ERROR_IS_OK(werr)) {
 941                 DEBUG(0, (__location__ " failed to commit transaction: %s\n",
 942                          dos_errstr(werr)));
 943         }
 944
 945         goto done;
 946
 947 cancel:
 948         werr = regdb_transaction_cancel();
 949         if (!W_ERROR_IS_OK(werr)) {
 950                 DEBUG(0, (__location__ " failed to cancel transaction: %s\n",
 951                          dos_errstr(werr)));
 952         }
 953
 954 done:
 955         talloc_free(mem_ctx);
 956         return werr;
 957 }
 958
 959 static TDB_DATA regdb_fetch_key_internal(TALLOC_CTX *mem_ctx, const char *key)
 960 {
 961         char *path = NULL;
 962         TDB_DATA data;
 963
 964         path = normalize_reg_path(mem_ctx, key);
 965         if (!path) {
 966                 return make_tdb_data(NULL, 0);
 967         }
 968
 969         data = dbwrap_fetch_bystring(regdb, mem_ctx, path);
 970
 971         TALLOC_FREE(path);
 972         return data;
 973 }
 974
 975
 976 /**
 977  * check whether a given key name represents a base key,
 978  * i.e one without a subkey separator ('/' or '\').
 979  */
 980 static bool regdb_key_is_base_key(const char *key)
 981 {
 982         TALLOC_CTX *mem_ctx = talloc_stackframe();
 983         bool ret = false;
 984         char *path;
 985
 986         if (key == NULL) {
 987                 goto done;
 988         }
 989
 990         path = normalize_reg_path(mem_ctx, key);
 991         if (path == NULL) {
 992                 DEBUG(0, ("out of memory! (talloc failed)\n"));
 993                 goto done;
 994         }
 995
 996         if (*path == '\0') {
 997                 goto done;
 998         }
 999
1000         ret = (strrchr(path, '/') == NULL);
1001
1002 done:
1003         TALLOC_FREE(mem_ctx);
1004         return ret;
1005 }
1006
1007 /*
1008  * regdb_key_exists() is a very frequent operation. It can be quite
1009  * time-consuming to fully fetch the parent's subkey list, talloc_strdup all
1010  * subkeys and then compare the keyname linearly to all the parent's subkeys.
1011  *
1012  * The following code tries to make this operation as efficient as possible:
1013  * Per registry key we create a list of subkeys that is very efficient to
1014  * search for existence of a subkey. Its format is:
1015  *
1016  * 4 bytes num_subkeys
1017  * 4*num_subkey bytes offset into the string array
1018  * then follows a sorted list of subkeys in uppercase
1019  *
1020  * This record is created by create_sorted_subkeys() on demand if it does not
1021  * exist. scan_parent_subkeys() uses regdb->parse_record to search the sorted
1022  * list, the parsing code and the binary search can be found in
1023  * parent_subkey_scanner. The code uses parse_record() to avoid a memcpy of
1024  * the potentially large subkey record.
1025  *
1026  * The sorted subkey record is deleted in regdb_store_keys_internal and
1027  * recreated on demand.
1028  */
1029
1030 static int cmp_keynames(const void *p1, const void *p2)
1031 {
1032         return StrCaseCmp(*((char **)p1), *((char **)p2));
1033 }
1034
1035 static bool create_sorted_subkeys(const char *key, const char *sorted_keyname)
1036 {
1037         char **sorted_subkeys;
1038         struct regsubkey_ctr *ctr;
1039         bool result = false;
1040         NTSTATUS status;
1041         char *buf;
1042         char *p;
1043         int i, res;
1044         size_t len;
1045         int num_subkeys;
1046         WERROR werr;
1047
1048         if (regdb->transaction_start(regdb) != 0) {
1049                 DEBUG(0, ("create_sorted_subkeys: transaction_start "
1050                           "failed\n"));
1051                 return false;
1052         }
1053
1054         werr = regsubkey_ctr_init(talloc_tos(), &ctr);
1055         if (!W_ERROR_IS_OK(werr)) {
1056                 goto fail;
1057         }
1058
1059         res = regdb_fetch_keys(key, ctr);
1060         if (res == -1) {
1061                 goto fail;
1062         }
1063
1064         num_subkeys = regsubkey_ctr_numkeys(ctr);
1065         sorted_subkeys = talloc_array(ctr, char *, num_subkeys);
1066         if (sorted_subkeys == NULL) {
1067                 goto fail;
1068         }
1069
1070         len = 4 + 4*num_subkeys;
1071
1072         for (i = 0; i < num_subkeys; i++) {
1073                 sorted_subkeys[i] = talloc_strdup_upper(sorted_subkeys,
1074                                         regsubkey_ctr_specific_key(ctr, i));
1075                 if (sorted_subkeys[i] == NULL) {
1076                         goto fail;
1077                 }
1078                 len += strlen(sorted_subkeys[i])+1;
1079         }
1080
1081         qsort(sorted_subkeys, num_subkeys, sizeof(char *), cmp_keynames);
1082
1083         buf = talloc_array(ctr, char, len);
1084         if (buf == NULL) {
1085                 goto fail;
1086         }
1087         p = buf + 4 + 4*num_subkeys;
1088
1089         SIVAL(buf, 0, num_subkeys);
1090
1091         for (i=0; i < num_subkeys; i++) {
1092                 ptrdiff_t offset = p - buf;
1093                 SIVAL(buf, 4 + 4*i, offset);
1094                 strlcpy(p, sorted_subkeys[i], len-offset);
1095                 p += strlen(sorted_subkeys[i]) + 1;
1096         }
1097
1098         status = dbwrap_store_bystring(
1099                 regdb, sorted_keyname, make_tdb_data((uint8_t *)buf, len),
1100                 TDB_REPLACE);
1101         if (!NT_STATUS_IS_OK(status)) {
1102                 /*
1103                  * Don't use a "goto fail;" here, this would commit the broken
1104                  * transaction. See below for an explanation.
1105                  */
1106                 if (regdb->transaction_cancel(regdb) == -1) {
1107                         DEBUG(0, ("create_sorted_subkeys: transaction_cancel "
1108                                   "failed\n"));
1109                 }
1110                 TALLOC_FREE(ctr);
1111                 return false;
1112         }
1113
1114         result = true;
1115  fail:
1116         /*
1117          * We only get here via the "goto fail" when we did not write anything
1118          * yet. Using transaction_commit even in a failure case is necessary
1119          * because this (disposable) call might be nested in other
1120          * transactions. Doing a cancel here would destroy the possibility of
1121          * a transaction_commit for transactions that we might be wrapped in.
1122          */
1123         if (regdb->transaction_commit(regdb) == -1) {
1124                 DEBUG(0, ("create_sorted_subkeys: transaction_start "
1125                           "failed\n"));
1126                 goto fail;
1127         }
1128
1129         TALLOC_FREE(ctr);
1130         return result;
1131 }
1132
1133 struct scan_subkey_state {
1134         char *name;
1135         bool scanned;
1136         bool found;
1137 };
1138
1139 static int parent_subkey_scanner(TDB_DATA key, TDB_DATA data,
1140                                  void *private_data)
1141 {
1142         struct scan_subkey_state *state =
1143                 (struct scan_subkey_state *)private_data;
1144         uint32_t num_subkeys;
1145         uint32_t l, u;
1146
1147         if (data.dsize < sizeof(uint32_t)) {
1148                 return -1;
1149         }
1150
1151         state->scanned = true;
1152         state->found = false;
1153
1154         tdb_unpack(data.dptr, data.dsize, "d", &num_subkeys);
1155
1156         l = 0;
1157         u = num_subkeys;
1158
1159         while (l < u) {
1160                 uint32_t idx = (l+u)/2;
1161                 char *s = (char *)data.dptr + IVAL(data.dptr, 4 + 4*idx);
1162                 int comparison = strcmp(state->name, s);
1163
1164                 if (comparison < 0) {
1165                         u = idx;
1166                 } else if (comparison > 0) {
1167                         l = idx + 1;
1168                 } else {
1169                         state->found = true;
1170                         return 0;
1171                 }
1172         }
1173         return 0;
1174 }
1175
1176 static bool scan_parent_subkeys(const char *parent, const char *name)
1177 {
1178         char *path = NULL;
1179         char *key = NULL;
1180         struct scan_subkey_state state = { 0, };
1181         bool result = false;
1182         int res;
1183
1184         state.name = NULL;
1185
1186         path = normalize_reg_path(talloc_tos(), parent);
1187         if (path == NULL) {
1188                 goto fail;
1189         }
1190
1191         key = talloc_asprintf(talloc_tos(), "%s/%s",
1192                               REG_SORTED_SUBKEYS_PREFIX, path);
1193         if (key == NULL) {
1194                 goto fail;
1195         }
1196
1197         state.name = talloc_strdup_upper(talloc_tos(), name);
1198         if (state.name == NULL) {
1199                 goto fail;
1200         }
1201         state.scanned = false;
1202
1203         res = regdb->parse_record(regdb, string_term_tdb_data(key),
1204                                   parent_subkey_scanner, &state);
1205
1206         if (state.scanned) {
1207                 result = state.found;
1208         } else {
1209                 if (!create_sorted_subkeys(path, key)) {
1210                         goto fail;
1211                 }
1212                 res = regdb->parse_record(regdb, string_term_tdb_data(key),
1213                                           parent_subkey_scanner, &state);
1214                 if ((res == 0) && (state.scanned)) {
1215                         result = state.found;
1216                 }
1217         }
1218
1219  fail:
1220         TALLOC_FREE(path);
1221         TALLOC_FREE(state.name);
1222         return result;
1223 }
1224
1225 /**
1226  * Check for the existence of a key.
1227  *
1228  * Existence of a key is authoritatively defined by its
1229  * existence in the list of subkeys of its parent key.
1230  * The exeption of this are keys without a parent key,
1231  * i.e. the "base" keys (HKLM, HKCU, ...).
1232  */
1233 static bool regdb_key_exists(const char *key)
1234 {
1235         TALLOC_CTX *mem_ctx = talloc_stackframe();
1236         TDB_DATA value;
1237         bool ret = false;
1238         char *path, *p;
1239
1240         if (key == NULL) {
1241                 goto done;
1242         }
1243
1244         path = normalize_reg_path(mem_ctx, key);
1245         if (path == NULL) {
1246                 DEBUG(0, ("out of memory! (talloc failed)\n"));
1247                 goto done;
1248         }
1249
1250         if (*path == '\0') {
1251                 goto done;
1252         }
1253
1254         p = strrchr(path, '/');
1255         if (p == NULL) {
1256                 /* this is a base key */
1257                 value = regdb_fetch_key_internal(mem_ctx, path);
1258                 ret = (value.dptr != NULL);
1259         } else {
1260                 *p = '\0';
1261                 ret = scan_parent_subkeys(path, p+1);
1262         }
1263
1264 done:
1265         TALLOC_FREE(mem_ctx);
1266         return ret;
1267 }
1268
1269
1270 /***********************************************************************
1271  Retrieve an array of strings containing subkeys.  Memory should be
1272  released by the caller.
1273  ***********************************************************************/
1274
1275 int regdb_fetch_keys(const char *key, struct regsubkey_ctr *ctr)
1276 {
1277         WERROR werr;
1278         uint32 num_items;
1279         uint8 *buf;
1280         uint32 buflen, len;
1281         int i;
1282         fstring subkeyname;
1283         int ret = -1;
1284         TALLOC_CTX *frame = talloc_stackframe();
1285         TDB_DATA value;
1286
1287         DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL"));
1288
1289         if (!regdb_key_exists(key)) {
1290                 goto done;
1291         }
1292
1293         werr = regsubkey_ctr_set_seqnum(ctr, regdb_get_seqnum());
1294         if (!W_ERROR_IS_OK(werr)) {
1295                 goto done;
1296         }
1297
1298         value = regdb_fetch_key_internal(frame, key);
1299
1300         if (value.dptr == NULL) {
1301                 DEBUG(10, ("regdb_fetch_keys: no subkeys found for key [%s]\n",
1302                            key));
1303                 ret = 0;
1304                 goto done;
1305         }
1306
1307         buf = value.dptr;
1308         buflen = value.dsize;
1309         len = tdb_unpack( buf, buflen, "d", &num_items);
1310
1311         for (i=0; i<num_items; i++) {
1312                 len += tdb_unpack(buf+len, buflen-len, "f", subkeyname);
1313                 werr = regsubkey_ctr_addkey(ctr, subkeyname);
1314                 if (!W_ERROR_IS_OK(werr)) {
1315                         DEBUG(5, ("regdb_fetch_keys: regsubkey_ctr_addkey "
1316                                   "failed: %s\n", dos_errstr(werr)));
1317                         goto done;
1318                 }
1319         }
1320
1321         DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items));
1322
1323         ret = num_items;
1324 done:
1325         TALLOC_FREE(frame);
1326         return ret;
1327 }
1328
1329 /****************************************************************************
1330  Unpack a list of registry values frem the TDB
1331  ***************************************************************************/
1332
1333 static int regdb_unpack_values(REGVAL_CTR *values, uint8 *buf, int buflen)
1334 {
1335         int             len = 0;
1336         uint32          type;
1337         fstring valuename;
1338         uint32          size;
1339         uint8           *data_p;
1340         uint32          num_values = 0;
1341         int             i;
1342
1343         /* loop and unpack the rest of the registry values */
1344
1345         len += tdb_unpack(buf+len, buflen-len, "d", &num_values);
1346
1347         for ( i=0; i<num_values; i++ ) {
1348                 /* unpack the next regval */
1349
1350                 type = REG_NONE;
1351                 size = 0;
1352                 data_p = NULL;
1353                 valuename[0] = '\0';
1354                 len += tdb_unpack(buf+len, buflen-len, "fdB",
1355                                   valuename,
1356                                   &type,
1357                                   &size,
1358                                   &data_p);
1359
1360                 /* add the new value. Paranoid protective code -- make sure data_p is valid */
1361
1362                 if (*valuename && size && data_p) {
1363                         regval_ctr_addvalue(values, valuename, type,
1364                                         (const char *)data_p, size);
1365                 }
1366                 SAFE_FREE(data_p); /* 'B' option to tdb_unpack does a malloc() */
1367
1368                 DEBUG(8,("specific: [%s], len: %d\n", valuename, size));
1369         }
1370
1371         return len;
1372 }
1373
1374 /****************************************************************************
1375  Pack all values in all printer keys
1376  ***************************************************************************/
1377
1378 static int regdb_pack_values(REGVAL_CTR *values, uint8 *buf, int buflen)
1379 {
1380         int             len = 0;
1381         int             i;
1382         REGISTRY_VALUE  *val;
1383         int             num_values;
1384
1385         if ( !values )
1386                 return 0;
1387
1388         num_values = regval_ctr_numvals( values );
1389
1390         /* pack the number of values first */
1391
1392         len += tdb_pack( buf+len, buflen-len, "d", num_values );
1393
1394         /* loop over all values */
1395
1396         for ( i=0; i<num_values; i++ ) {
1397                 val = regval_ctr_specific_value( values, i );
1398                 len += tdb_pack(buf+len, buflen-len, "fdB",
1399                                 regval_name(val),
1400                                 regval_type(val),
1401                                 regval_size(val),
1402                                 regval_data_p(val) );
1403         }
1404
1405         return len;
1406 }
1407
1408 /***********************************************************************
1409  Retrieve an array of strings containing subkeys.  Memory should be
1410  released by the caller.
1411  ***********************************************************************/
1412
1413 int regdb_fetch_values( const char* key, REGVAL_CTR *values )
1414 {
1415         char *keystr = NULL;
1416         TALLOC_CTX *ctx = talloc_stackframe();
1417         int ret = 0;
1418         TDB_DATA value;
1419
1420         DEBUG(10,("regdb_fetch_values: Looking for value of key [%s] \n", key));
1421
1422         if (!regdb_key_exists(key)) {
1423                 goto done;
1424         }
1425
1426         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key);
1427         if (!keystr) {
1428                 goto done;
1429         }
1430
1431         values->seqnum = regdb_get_seqnum();
1432
1433         value = regdb_fetch_key_internal(ctx, keystr);
1434
1435         if (!value.dptr) {
1436                 /* all keys have zero values by default */
1437                 goto done;
1438         }
1439
1440         regdb_unpack_values(values, value.dptr, value.dsize);
1441         ret = regval_ctr_numvals(values);
1442
1443 done:
1444         TALLOC_FREE(ctx);
1445         return ret;
1446 }
1447
1448 bool regdb_store_values( const char *key, REGVAL_CTR *values )
1449 {
1450         TDB_DATA old_data, data;
1451         char *keystr = NULL;
1452         TALLOC_CTX *ctx = talloc_stackframe();
1453         int len;
1454         NTSTATUS status;
1455         bool result = false;
1456
1457         DEBUG(10,("regdb_store_values: Looking for value of key [%s] \n", key));
1458
1459         if (!regdb_key_exists(key)) {
1460                 goto done;
1461         }
1462
1463         ZERO_STRUCT(data);
1464
1465         len = regdb_pack_values(values, data.dptr, data.dsize);
1466         if (len <= 0) {
1467                 DEBUG(0,("regdb_store_values: unable to pack values. len <= 0\n"));
1468                 goto done;
1469         }
1470
1471         data.dptr = TALLOC_ARRAY(ctx, uint8, len);
1472         data.dsize = len;
1473
1474         len = regdb_pack_values(values, data.dptr, data.dsize);
1475
1476         SMB_ASSERT( len == data.dsize );
1477
1478         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key );
1479         if (!keystr) {
1480                 goto done;
1481         }
1482         keystr = normalize_reg_path(ctx, keystr);
1483         if (!keystr) {
1484                 goto done;
1485         }
1486
1487         old_data = dbwrap_fetch_bystring(regdb, ctx, keystr);
1488
1489         if ((old_data.dptr != NULL)
1490             && (old_data.dsize == data.dsize)
1491             && (memcmp(old_data.dptr, data.dptr, data.dsize) == 0))
1492         {
1493                 result = true;
1494                 goto done;
1495         }
1496
1497         status = dbwrap_trans_store_bystring(regdb, keystr, data, TDB_REPLACE);
1498
1499         result = NT_STATUS_IS_OK(status);
1500
1501 done:
1502         TALLOC_FREE(ctx);
1503         return result;
1504 }
1505
1506 static WERROR regdb_get_secdesc(TALLOC_CTX *mem_ctx, const char *key,
1507                                 struct security_descriptor **psecdesc)
1508 {
1509         char *tdbkey;
1510         TDB_DATA data;
1511         NTSTATUS status;
1512         TALLOC_CTX *tmp_ctx = talloc_stackframe();
1513         WERROR err = WERR_OK;
1514
1515         DEBUG(10, ("regdb_get_secdesc: Getting secdesc of key [%s]\n", key));
1516
1517         if (!regdb_key_exists(key)) {
1518                 err = WERR_BADFILE;
1519                 goto done;
1520         }
1521
1522         tdbkey = talloc_asprintf(tmp_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1523         if (tdbkey == NULL) {
1524                 err = WERR_NOMEM;
1525                 goto done;
1526         }
1527         normalize_dbkey(tdbkey);
1528
1529         data = dbwrap_fetch_bystring(regdb, tmp_ctx, tdbkey);
1530         if (data.dptr == NULL) {
1531                 err = WERR_BADFILE;
1532                 goto done;
1533         }
1534
1535         status = unmarshall_sec_desc(mem_ctx, (uint8 *)data.dptr, data.dsize,
1536                                      psecdesc);
1537
1538         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1539                 err = WERR_NOMEM;
1540         } else if (!NT_STATUS_IS_OK(status)) {
1541                 err = WERR_REG_CORRUPT;
1542         }
1543
1544 done:
1545         TALLOC_FREE(tmp_ctx);
1546         return err;
1547 }
1548
1549 static WERROR regdb_set_secdesc(const char *key,
1550                                 struct security_descriptor *secdesc)
1551 {
1552         TALLOC_CTX *mem_ctx = talloc_stackframe();
1553         char *tdbkey;
1554         NTSTATUS status;
1555         WERROR err = WERR_NOMEM;
1556         TDB_DATA tdbdata;
1557
1558         if (!regdb_key_exists(key)) {
1559                 err = WERR_BADFILE;
1560                 goto done;
1561         }
1562
1563         tdbkey = talloc_asprintf(mem_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1564         if (tdbkey == NULL) {
1565                 goto done;
1566         }
1567         normalize_dbkey(tdbkey);
1568
1569         if (secdesc == NULL) {
1570                 /* assuming a delete */
1571                 status = dbwrap_trans_delete_bystring(regdb, tdbkey);
1572                 if (NT_STATUS_IS_OK(status)) {
1573                         err = WERR_OK;
1574                 } else {
1575                         err = ntstatus_to_werror(status);
1576                 }
1577                 goto done;
1578         }
1579
1580         err = ntstatus_to_werror(marshall_sec_desc(mem_ctx, secdesc,
1581                                                    &tdbdata.dptr,
1582                                                    &tdbdata.dsize));
1583         if (!W_ERROR_IS_OK(err)) {
1584                 goto done;
1585         }
1586
1587         status = dbwrap_trans_store_bystring(regdb, tdbkey, tdbdata, 0);
1588         if (!NT_STATUS_IS_OK(status)) {
1589                 err = ntstatus_to_werror(status);
1590                 goto done;
1591         }
1592
1593  done:
1594         TALLOC_FREE(mem_ctx);
1595         return err;
1596 }
1597
1598 bool regdb_subkeys_need_update(struct regsubkey_ctr *subkeys)
1599 {
1600         return (regdb_get_seqnum() != regsubkey_ctr_get_seqnum(subkeys));
1601 }
1602
1603 bool regdb_values_need_update(REGVAL_CTR *values)
1604 {
1605         return (regdb_get_seqnum() != values->seqnum);
1606 }
1607
1608 /*
1609  * Table of function pointers for default access
1610  */
1611
1612 REGISTRY_OPS regdb_ops = {
1613         .fetch_subkeys = regdb_fetch_keys,
1614         .fetch_values = regdb_fetch_values,
1615         .store_subkeys = regdb_store_keys,
1616         .store_values = regdb_store_values,
1617         .create_subkey = regdb_create_subkey,
1618         .get_secdesc = regdb_get_secdesc,
1619         .set_secdesc = regdb_set_secdesc,
1620         .subkeys_need_update = regdb_subkeys_need_update,
1621         .values_need_update = regdb_values_need_update
1622 };