source3/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 static WERROR regdb_delete_key_lists(const char *keyname)
 569 {
 570         WERROR werr;
 571
 572         werr = regdb_delete_values(keyname);
 573         if (!W_ERROR_IS_OK(werr)) {
 574                 DEBUG(1, (__location__ " Deleting %s/%s failed: %s\n",
 575                           REG_VALUE_PREFIX, keyname, win_errstr(werr)));
 576                 goto done;
 577         }
 578
 579         werr = regdb_delete_secdesc(keyname);
 580         if (!W_ERROR_IS_OK(werr)) {
 581                 DEBUG(1, (__location__ " Deleting %s/%s failed: %s\n",
 582                           REG_SECDESC_PREFIX, keyname, win_errstr(werr)));
 583                 goto done;
 584         }
 585
 586         werr = regdb_delete_subkeylist(keyname);
 587         if (!W_ERROR_IS_OK(werr)) {
 588                 DEBUG(1, (__location__ " Deleting %s failed: %s\n",
 589                           keyname, win_errstr(werr)));
 590                 goto done;
 591         }
 592
 593 done:
 594         return werr;
 595 }
 596
 597 /***********************************************************************
 598  Add subkey strings to the registry tdb under a defined key
 599  fmt is the same format as tdb_pack except this function only supports
 600  fstrings
 601  ***********************************************************************/
 602
 603 static bool regdb_store_keys_internal(const char *key, struct regsubkey_ctr *ctr)
 604 {
 605         TDB_DATA dbuf;
 606         uint8 *buffer = NULL;
 607         int i = 0;
 608         uint32 len, buflen;
 609         bool ret = true;
 610         uint32 num_subkeys = regsubkey_ctr_numkeys(ctr);
 611         char *keyname = NULL;
 612         TALLOC_CTX *ctx = talloc_stackframe();
 613         NTSTATUS status;
 614
 615         if (!key) {
 616                 return false;
 617         }
 618
 619         keyname = talloc_strdup(ctx, key);
 620         if (!keyname) {
 621                 return false;
 622         }
 623         keyname = normalize_reg_path(ctx, keyname);
 624
 625         /* allocate some initial memory */
 626
 627         buffer = (uint8 *)SMB_MALLOC(1024);
 628         if (buffer == NULL) {
 629                 return false;
 630         }
 631         buflen = 1024;
 632         len = 0;
 633
 634         /* store the number of subkeys */
 635
 636         len += tdb_pack(buffer+len, buflen-len, "d", num_subkeys);
 637
 638         /* pack all the strings */
 639
 640         for (i=0; i<num_subkeys; i++) {
 641                 size_t thistime;
 642
 643                 thistime = tdb_pack(buffer+len, buflen-len, "f",
 644                                     regsubkey_ctr_specific_key(ctr, i));
 645                 if (len+thistime > buflen) {
 646                         size_t thistime2;
 647                         /*
 648                          * tdb_pack hasn't done anything because of the short
 649                          * buffer, allocate extra space.
 650                          */
 651                         buffer = SMB_REALLOC_ARRAY(buffer, uint8_t,
 652                                                    (len+thistime)*2);
 653                         if(buffer == NULL) {
 654                                 DEBUG(0, ("regdb_store_keys: Failed to realloc "
 655                                           "memory of size [%u]\n",
 656                                           (unsigned int)(len+thistime)*2));
 657                                 ret = false;
 658                                 goto done;
 659                         }
 660                         buflen = (len+thistime)*2;
 661                         thistime2 = tdb_pack(
 662                                 buffer+len, buflen-len, "f",
 663                                 regsubkey_ctr_specific_key(ctr, i));
 664                         if (thistime2 != thistime) {
 665                                 DEBUG(0, ("tdb_pack failed\n"));
 666                                 ret = false;
 667                                 goto done;
 668                         }
 669                 }
 670                 len += thistime;
 671         }
 672
 673         /* finally write out the data */
 674
 675         dbuf.dptr = buffer;
 676         dbuf.dsize = len;
 677         status = dbwrap_store_bystring(regdb, keyname, dbuf, TDB_REPLACE);
 678         if (!NT_STATUS_IS_OK(status)) {
 679                 ret = false;
 680                 goto done;
 681         }
 682
 683         /*
 684          * Delete a sorted subkey cache for regdb_key_exists, will be
 685          * recreated automatically
 686          */
 687         keyname = talloc_asprintf(ctx, "%s/%s", REG_SORTED_SUBKEYS_PREFIX,
 688                                   keyname);
 689         if (keyname != NULL) {
 690                 dbwrap_delete_bystring(regdb, keyname);
 691         }
 692
 693 done:
 694         TALLOC_FREE(ctx);
 695         SAFE_FREE(buffer);
 696         return ret;
 697 }
 698
 699 /***********************************************************************
 700  Store the new subkey record and create any child key records that
 701  do not currently exist
 702  ***********************************************************************/
 703
 704 bool regdb_store_keys(const char *key, struct regsubkey_ctr *ctr)
 705 {
 706         int num_subkeys, old_num_subkeys, i;
 707         char *path = NULL;
 708         struct regsubkey_ctr *subkeys = NULL, *old_subkeys = NULL;
 709         char *oldkeyname = NULL;
 710         TALLOC_CTX *ctx = talloc_stackframe();
 711         WERROR werr;
 712
 713         if (!regdb_key_is_base_key(key) && !regdb_key_exists(key)) {
 714                 goto fail;
 715         }
 716
 717         /*
 718          * fetch a list of the old subkeys so we can determine if anything has
 719          * changed
 720          */
 721
 722         werr = regsubkey_ctr_init(ctx, &old_subkeys);
 723         if (!W_ERROR_IS_OK(werr)) {
 724                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 725                 return false;
 726         }
 727
 728         regdb_fetch_keys(key, old_subkeys);
 729
 730         num_subkeys = regsubkey_ctr_numkeys(ctr);
 731         old_num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
 732         if ((num_subkeys && old_num_subkeys) &&
 733             (num_subkeys == old_num_subkeys)) {
 734
 735                 for (i = 0; i < num_subkeys; i++) {
 736                         if (strcmp(regsubkey_ctr_specific_key(ctr, i),
 737                                    regsubkey_ctr_specific_key(old_subkeys, i))
 738                             != 0)
 739                         {
 740                                 break;
 741                         }
 742                 }
 743                 if (i == num_subkeys) {
 744                         /*
 745                          * Nothing changed, no point to even start a tdb
 746                          * transaction
 747                          */
 748                         TALLOC_FREE(old_subkeys);
 749                         return true;
 750                 }
 751         }
 752
 753         TALLOC_FREE(old_subkeys);
 754
 755         if (regdb->transaction_start(regdb) != 0) {
 756                 DEBUG(0, ("regdb_store_keys: transaction_start failed\n"));
 757                 goto fail;
 758         }
 759
 760         /*
 761          * Re-fetch the old keys inside the transaction
 762          */
 763
 764         werr = regsubkey_ctr_init(ctx, &old_subkeys);
 765         if (!W_ERROR_IS_OK(werr)) {
 766                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 767                 goto cancel;
 768         }
 769
 770         regdb_fetch_keys(key, old_subkeys);
 771
 772         /*
 773          * Make the store operation as safe as possible without transactions:
 774          *
 775          * (1) For each subkey removed from ctr compared with old_subkeys:
 776          *
 777          *     (a) First delete the value db entry.
 778          *
 779          *     (b) Next delete the secdesc db record.
 780          *
 781          *     (c) Then delete the subkey list entry.
 782          *
 783          * (2) Now write the list of subkeys of the parent key,
 784          *     deleting removed entries and adding new ones.
 785          *
 786          * (3) Finally create the subkey list entries for the added keys.
 787          *
 788          * This way if we crash half-way in between deleting the subkeys
 789          * and storing the parent's list of subkeys, no old data can pop up
 790          * out of the blue when re-adding keys later on.
 791          */
 792
 793         /* (1) delete removed keys' lists (values/secdesc/subkeys) */
 794
 795         num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
 796         for (i=0; i<num_subkeys; i++) {
 797                 oldkeyname = regsubkey_ctr_specific_key(old_subkeys, i);
 798
 799                 if (regsubkey_ctr_key_exists(ctr, oldkeyname)) {
 800                         /*
 801                          * It's still around, don't delete
 802                          */
 803
 804                         continue;
 805                 }
 806
 807                 path = talloc_asprintf(ctx, "%s/%s", key, oldkeyname);
 808                 if (!path) {
 809                         goto cancel;
 810                 }
 811
 812                 werr = regdb_delete_key_lists(path);
 813                 W_ERROR_NOT_OK_GOTO(werr, cancel);
 814
 815                 TALLOC_FREE(path);
 816         }
 817
 818         TALLOC_FREE(old_subkeys);
 819
 820         /* (2) store the subkey list for the parent */
 821
 822         if (!regdb_store_keys_internal(key, ctr) ) {
 823                 DEBUG(0,("regdb_store_keys: Failed to store new subkey list "
 824                          "for parent [%s]\n", key));
 825                 goto cancel;
 826         }
 827
 828         /* (3) now create records for any subkeys that don't already exist */
 829
 830         num_subkeys = regsubkey_ctr_numkeys(ctr);
 831
 832         if (num_subkeys == 0) {
 833                 werr = regsubkey_ctr_init(ctx, &subkeys);
 834                 if (!W_ERROR_IS_OK(werr)) {
 835                         DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 836                         goto cancel;
 837                 }
 838
 839                 if (!regdb_store_keys_internal(key, subkeys)) {
 840                         DEBUG(0,("regdb_store_keys: Failed to store "
 841                                  "new record for key [%s]\n", key));
 842                         goto cancel;
 843                 }
 844                 TALLOC_FREE(subkeys);
 845
 846         }
 847
 848         for (i=0; i<num_subkeys; i++) {
 849                 path = talloc_asprintf(ctx, "%s/%s",
 850                                         key,
 851                                         regsubkey_ctr_specific_key(ctr, i));
 852                 if (!path) {
 853                         goto cancel;
 854                 }
 855                 werr = regsubkey_ctr_init(ctx, &subkeys);
 856                 if (!W_ERROR_IS_OK(werr)) {
 857                         DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 858                         goto cancel;
 859                 }
 860
 861                 if (regdb_fetch_keys( path, subkeys ) == -1) {
 862                         /* create a record with 0 subkeys */
 863                         if (!regdb_store_keys_internal(path, subkeys)) {
 864                                 DEBUG(0,("regdb_store_keys: Failed to store "
 865                                          "new record for key [%s]\n", path));
 866                                 goto cancel;
 867                         }
 868                 }
 869
 870                 TALLOC_FREE(subkeys);
 871                 TALLOC_FREE(path);
 872         }
 873
 874         if (regdb->transaction_commit(regdb) != 0) {
 875                 DEBUG(0, ("regdb_store_keys: Could not commit transaction\n"));
 876                 goto fail;
 877         }
 878
 879         TALLOC_FREE(ctx);
 880         return true;
 881
 882 cancel:
 883         if (regdb->transaction_cancel(regdb) != 0) {
 884                 smb_panic("regdb_store_keys: transaction_cancel failed\n");
 885         }
 886
 887 fail:
 888         TALLOC_FREE(ctx);
 889
 890         return false;
 891 }
 892
 893 static WERROR regdb_create_subkey(const char *key, const char *subkey)
 894 {
 895         WERROR werr;
 896         struct regsubkey_ctr *subkeys;
 897         TALLOC_CTX *mem_ctx = talloc_stackframe();
 898
 899         if (!regdb_key_is_base_key(key) && !regdb_key_exists(key)) {
 900                 werr = WERR_NOT_FOUND;
 901                 goto done;
 902         }
 903
 904         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
 905         W_ERROR_NOT_OK_GOTO_DONE(werr);
 906
 907         if (regdb_fetch_keys(key, subkeys) < 0) {
 908                 werr = WERR_REG_IO_FAILURE;
 909                 goto done;
 910         }
 911
 912         if (regsubkey_ctr_key_exists(subkeys, subkey)) {
 913                 werr = WERR_OK;
 914                 goto done;
 915         }
 916
 917         talloc_free(subkeys);
 918
 919         werr = regdb_transaction_start();
 920         W_ERROR_NOT_OK_GOTO_DONE(werr);
 921
 922         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
 923         W_ERROR_NOT_OK_GOTO(werr, cancel);
 924
 925         if (regdb_fetch_keys(key, subkeys) < 0) {
 926                 werr = WERR_REG_IO_FAILURE;
 927                 goto cancel;
 928         }
 929
 930         werr = regsubkey_ctr_addkey(subkeys, subkey);
 931         W_ERROR_NOT_OK_GOTO(werr, cancel);
 932
 933         if (!regdb_store_keys_internal(key, subkeys)) {
 934                 DEBUG(0, (__location__ " failed to store new subkey list for "
 935                          "parent key %s\n", key));
 936                 werr = WERR_REG_IO_FAILURE;
 937                 goto cancel;
 938         }
 939
 940         werr = regdb_transaction_commit();
 941         if (!W_ERROR_IS_OK(werr)) {
 942                 DEBUG(0, (__location__ " failed to commit transaction: %s\n",
 943                          win_errstr(werr)));
 944         }
 945
 946         goto done;
 947
 948 cancel:
 949         werr = regdb_transaction_cancel();
 950         if (!W_ERROR_IS_OK(werr)) {
 951                 DEBUG(0, (__location__ " failed to cancel transaction: %s\n",
 952                          win_errstr(werr)));
 953         }
 954
 955 done:
 956         talloc_free(mem_ctx);
 957         return werr;
 958 }
 959
 960 static WERROR regdb_delete_subkey(const char *key, const char *subkey)
 961 {
 962         WERROR werr, werr2;
 963         struct regsubkey_ctr *subkeys;
 964         char *path;
 965         TALLOC_CTX *mem_ctx = talloc_stackframe();
 966
 967         if (!regdb_key_is_base_key(key) && !regdb_key_exists(key)) {
 968                 werr = WERR_NOT_FOUND;
 969                 goto done;
 970         }
 971
 972         path = talloc_asprintf(mem_ctx, "%s/%s", key, subkey);
 973         if (path == NULL) {
 974                 werr = WERR_NOMEM;
 975                 goto done;
 976         }
 977
 978         if (!regdb_key_exists(path)) {
 979                 werr = WERR_OK;
 980                 goto done;
 981         }
 982
 983         werr = regdb_transaction_start();
 984         W_ERROR_NOT_OK_GOTO_DONE(werr);
 985
 986         werr = regdb_delete_key_lists(path);
 987         W_ERROR_NOT_OK_GOTO(werr, cancel);
 988
 989         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
 990         W_ERROR_NOT_OK_GOTO(werr, cancel);
 991
 992         if (regdb_fetch_keys(key, subkeys) < 0) {
 993                 werr = WERR_REG_IO_FAILURE;
 994                 goto cancel;
 995         }
 996
 997         werr = regsubkey_ctr_delkey(subkeys, subkey);
 998         W_ERROR_NOT_OK_GOTO(werr, cancel);
 999
1000         if (!regdb_store_keys_internal(key, subkeys)) {
1001                 DEBUG(0, (__location__ " failed to store new subkey_list for "
1002                          "parent key %s\n", key));
1003                 werr = WERR_REG_IO_FAILURE;
1004                 goto cancel;
1005         }
1006
1007         werr = regdb_transaction_commit();
1008         if (!W_ERROR_IS_OK(werr)) {
1009                 DEBUG(0, (__location__ " failed to commit transaction: %s\n",
1010                          win_errstr(werr)));
1011         }
1012
1013         goto done;
1014
1015 cancel:
1016         werr2 = regdb_transaction_cancel();
1017         if (!W_ERROR_IS_OK(werr2)) {
1018                 DEBUG(0, (__location__ " failed to cancel transaction: %s\n",
1019                          win_errstr(werr2)));
1020         }
1021
1022 done:
1023         talloc_free(mem_ctx);
1024         return werr;
1025 }
1026
1027 static TDB_DATA regdb_fetch_key_internal(TALLOC_CTX *mem_ctx, const char *key)
1028 {
1029         char *path = NULL;
1030         TDB_DATA data;
1031
1032         path = normalize_reg_path(mem_ctx, key);
1033         if (!path) {
1034                 return make_tdb_data(NULL, 0);
1035         }
1036
1037         data = dbwrap_fetch_bystring(regdb, mem_ctx, path);
1038
1039         TALLOC_FREE(path);
1040         return data;
1041 }
1042
1043
1044 /**
1045  * check whether a given key name represents a base key,
1046  * i.e one without a subkey separator ('/' or '\').
1047  */
1048 static bool regdb_key_is_base_key(const char *key)
1049 {
1050         TALLOC_CTX *mem_ctx = talloc_stackframe();
1051         bool ret = false;
1052         char *path;
1053
1054         if (key == NULL) {
1055                 goto done;
1056         }
1057
1058         path = normalize_reg_path(mem_ctx, key);
1059         if (path == NULL) {
1060                 DEBUG(0, ("out of memory! (talloc failed)\n"));
1061                 goto done;
1062         }
1063
1064         if (*path == '\0') {
1065                 goto done;
1066         }
1067
1068         ret = (strrchr(path, '/') == NULL);
1069
1070 done:
1071         TALLOC_FREE(mem_ctx);
1072         return ret;
1073 }
1074
1075 /*
1076  * regdb_key_exists() is a very frequent operation. It can be quite
1077  * time-consuming to fully fetch the parent's subkey list, talloc_strdup all
1078  * subkeys and then compare the keyname linearly to all the parent's subkeys.
1079  *
1080  * The following code tries to make this operation as efficient as possible:
1081  * Per registry key we create a list of subkeys that is very efficient to
1082  * search for existence of a subkey. Its format is:
1083  *
1084  * 4 bytes num_subkeys
1085  * 4*num_subkey bytes offset into the string array
1086  * then follows a sorted list of subkeys in uppercase
1087  *
1088  * This record is created by create_sorted_subkeys() on demand if it does not
1089  * exist. scan_parent_subkeys() uses regdb->parse_record to search the sorted
1090  * list, the parsing code and the binary search can be found in
1091  * parent_subkey_scanner. The code uses parse_record() to avoid a memcpy of
1092  * the potentially large subkey record.
1093  *
1094  * The sorted subkey record is deleted in regdb_store_keys_internal and
1095  * recreated on demand.
1096  */
1097
1098 static int cmp_keynames(const void *p1, const void *p2)
1099 {
1100         return StrCaseCmp(*((char **)p1), *((char **)p2));
1101 }
1102
1103 static bool create_sorted_subkeys(const char *key, const char *sorted_keyname)
1104 {
1105         char **sorted_subkeys;
1106         struct regsubkey_ctr *ctr;
1107         bool result = false;
1108         NTSTATUS status;
1109         char *buf;
1110         char *p;
1111         int i, res;
1112         size_t len;
1113         int num_subkeys;
1114         WERROR werr;
1115
1116         if (regdb->transaction_start(regdb) != 0) {
1117                 DEBUG(0, ("create_sorted_subkeys: transaction_start "
1118                           "failed\n"));
1119                 return false;
1120         }
1121
1122         werr = regsubkey_ctr_init(talloc_tos(), &ctr);
1123         if (!W_ERROR_IS_OK(werr)) {
1124                 goto fail;
1125         }
1126
1127         res = regdb_fetch_keys(key, ctr);
1128         if (res == -1) {
1129                 goto fail;
1130         }
1131
1132         num_subkeys = regsubkey_ctr_numkeys(ctr);
1133         sorted_subkeys = talloc_array(ctr, char *, num_subkeys);
1134         if (sorted_subkeys == NULL) {
1135                 goto fail;
1136         }
1137
1138         len = 4 + 4*num_subkeys;
1139
1140         for (i = 0; i < num_subkeys; i++) {
1141                 sorted_subkeys[i] = talloc_strdup_upper(sorted_subkeys,
1142                                         regsubkey_ctr_specific_key(ctr, i));
1143                 if (sorted_subkeys[i] == NULL) {
1144                         goto fail;
1145                 }
1146                 len += strlen(sorted_subkeys[i])+1;
1147         }
1148
1149         qsort(sorted_subkeys, num_subkeys, sizeof(char *), cmp_keynames);
1150
1151         buf = talloc_array(ctr, char, len);
1152         if (buf == NULL) {
1153                 goto fail;
1154         }
1155         p = buf + 4 + 4*num_subkeys;
1156
1157         SIVAL(buf, 0, num_subkeys);
1158
1159         for (i=0; i < num_subkeys; i++) {
1160                 ptrdiff_t offset = p - buf;
1161                 SIVAL(buf, 4 + 4*i, offset);
1162                 strlcpy(p, sorted_subkeys[i], len-offset);
1163                 p += strlen(sorted_subkeys[i]) + 1;
1164         }
1165
1166         status = dbwrap_store_bystring(
1167                 regdb, sorted_keyname, make_tdb_data((uint8_t *)buf, len),
1168                 TDB_REPLACE);
1169         if (!NT_STATUS_IS_OK(status)) {
1170                 /*
1171                  * Don't use a "goto fail;" here, this would commit the broken
1172                  * transaction. See below for an explanation.
1173                  */
1174                 if (regdb->transaction_cancel(regdb) == -1) {
1175                         DEBUG(0, ("create_sorted_subkeys: transaction_cancel "
1176                                   "failed\n"));
1177                 }
1178                 TALLOC_FREE(ctr);
1179                 return false;
1180         }
1181
1182         result = true;
1183  fail:
1184         /*
1185          * We only get here via the "goto fail" when we did not write anything
1186          * yet. Using transaction_commit even in a failure case is necessary
1187          * because this (disposable) call might be nested in other
1188          * transactions. Doing a cancel here would destroy the possibility of
1189          * a transaction_commit for transactions that we might be wrapped in.
1190          */
1191         if (regdb->transaction_commit(regdb) == -1) {
1192                 DEBUG(0, ("create_sorted_subkeys: transaction_start "
1193                           "failed\n"));
1194                 goto fail;
1195         }
1196
1197         TALLOC_FREE(ctr);
1198         return result;
1199 }
1200
1201 struct scan_subkey_state {
1202         char *name;
1203         bool scanned;
1204         bool found;
1205 };
1206
1207 static int parent_subkey_scanner(TDB_DATA key, TDB_DATA data,
1208                                  void *private_data)
1209 {
1210         struct scan_subkey_state *state =
1211                 (struct scan_subkey_state *)private_data;
1212         uint32_t num_subkeys;
1213         uint32_t l, u;
1214
1215         if (data.dsize < sizeof(uint32_t)) {
1216                 return -1;
1217         }
1218
1219         state->scanned = true;
1220         state->found = false;
1221
1222         tdb_unpack(data.dptr, data.dsize, "d", &num_subkeys);
1223
1224         l = 0;
1225         u = num_subkeys;
1226
1227         while (l < u) {
1228                 uint32_t idx = (l+u)/2;
1229                 char *s = (char *)data.dptr + IVAL(data.dptr, 4 + 4*idx);
1230                 int comparison = strcmp(state->name, s);
1231
1232                 if (comparison < 0) {
1233                         u = idx;
1234                 } else if (comparison > 0) {
1235                         l = idx + 1;
1236                 } else {
1237                         state->found = true;
1238                         return 0;
1239                 }
1240         }
1241         return 0;
1242 }
1243
1244 static bool scan_parent_subkeys(const char *parent, const char *name)
1245 {
1246         char *path = NULL;
1247         char *key = NULL;
1248         struct scan_subkey_state state = { 0, };
1249         bool result = false;
1250         int res;
1251
1252         state.name = NULL;
1253
1254         path = normalize_reg_path(talloc_tos(), parent);
1255         if (path == NULL) {
1256                 goto fail;
1257         }
1258
1259         key = talloc_asprintf(talloc_tos(), "%s/%s",
1260                               REG_SORTED_SUBKEYS_PREFIX, path);
1261         if (key == NULL) {
1262                 goto fail;
1263         }
1264
1265         state.name = talloc_strdup_upper(talloc_tos(), name);
1266         if (state.name == NULL) {
1267                 goto fail;
1268         }
1269         state.scanned = false;
1270
1271         res = regdb->parse_record(regdb, string_term_tdb_data(key),
1272                                   parent_subkey_scanner, &state);
1273
1274         if (state.scanned) {
1275                 result = state.found;
1276         } else {
1277                 if (!create_sorted_subkeys(path, key)) {
1278                         goto fail;
1279                 }
1280                 res = regdb->parse_record(regdb, string_term_tdb_data(key),
1281                                           parent_subkey_scanner, &state);
1282                 if ((res == 0) && (state.scanned)) {
1283                         result = state.found;
1284                 }
1285         }
1286
1287  fail:
1288         TALLOC_FREE(path);
1289         TALLOC_FREE(state.name);
1290         return result;
1291 }
1292
1293 /**
1294  * Check for the existence of a key.
1295  *
1296  * Existence of a key is authoritatively defined by its
1297  * existence in the list of subkeys of its parent key.
1298  * The exeption of this are keys without a parent key,
1299  * i.e. the "base" keys (HKLM, HKCU, ...).
1300  */
1301 static bool regdb_key_exists(const char *key)
1302 {
1303         TALLOC_CTX *mem_ctx = talloc_stackframe();
1304         TDB_DATA value;
1305         bool ret = false;
1306         char *path, *p;
1307
1308         if (key == NULL) {
1309                 goto done;
1310         }
1311
1312         path = normalize_reg_path(mem_ctx, key);
1313         if (path == NULL) {
1314                 DEBUG(0, ("out of memory! (talloc failed)\n"));
1315                 goto done;
1316         }
1317
1318         if (*path == '\0') {
1319                 goto done;
1320         }
1321
1322         p = strrchr(path, '/');
1323         if (p == NULL) {
1324                 /* this is a base key */
1325                 value = regdb_fetch_key_internal(mem_ctx, path);
1326                 ret = (value.dptr != NULL);
1327         } else {
1328                 *p = '\0';
1329                 ret = scan_parent_subkeys(path, p+1);
1330         }
1331
1332 done:
1333         TALLOC_FREE(mem_ctx);
1334         return ret;
1335 }
1336
1337
1338 /***********************************************************************
1339  Retrieve an array of strings containing subkeys.  Memory should be
1340  released by the caller.
1341  ***********************************************************************/
1342
1343 int regdb_fetch_keys(const char *key, struct regsubkey_ctr *ctr)
1344 {
1345         WERROR werr;
1346         uint32 num_items;
1347         uint8 *buf;
1348         uint32 buflen, len;
1349         int i;
1350         fstring subkeyname;
1351         int ret = -1;
1352         TALLOC_CTX *frame = talloc_stackframe();
1353         TDB_DATA value;
1354
1355         DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL"));
1356
1357         if (!regdb_key_exists(key)) {
1358                 goto done;
1359         }
1360
1361         werr = regsubkey_ctr_set_seqnum(ctr, regdb_get_seqnum());
1362         if (!W_ERROR_IS_OK(werr)) {
1363                 goto done;
1364         }
1365
1366         value = regdb_fetch_key_internal(frame, key);
1367
1368         if (value.dptr == NULL) {
1369                 DEBUG(10, ("regdb_fetch_keys: no subkeys found for key [%s]\n",
1370                            key));
1371                 ret = 0;
1372                 goto done;
1373         }
1374
1375         buf = value.dptr;
1376         buflen = value.dsize;
1377         len = tdb_unpack( buf, buflen, "d", &num_items);
1378
1379         for (i=0; i<num_items; i++) {
1380                 len += tdb_unpack(buf+len, buflen-len, "f", subkeyname);
1381                 werr = regsubkey_ctr_addkey(ctr, subkeyname);
1382                 if (!W_ERROR_IS_OK(werr)) {
1383                         DEBUG(5, ("regdb_fetch_keys: regsubkey_ctr_addkey "
1384                                   "failed: %s\n", win_errstr(werr)));
1385                         goto done;
1386                 }
1387         }
1388
1389         DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items));
1390
1391         ret = num_items;
1392 done:
1393         TALLOC_FREE(frame);
1394         return ret;
1395 }
1396
1397 /****************************************************************************
1398  Unpack a list of registry values frem the TDB
1399  ***************************************************************************/
1400
1401 static int regdb_unpack_values(REGVAL_CTR *values, uint8 *buf, int buflen)
1402 {
1403         int             len = 0;
1404         uint32          type;
1405         fstring valuename;
1406         uint32          size;
1407         uint8           *data_p;
1408         uint32          num_values = 0;
1409         int             i;
1410
1411         /* loop and unpack the rest of the registry values */
1412
1413         len += tdb_unpack(buf+len, buflen-len, "d", &num_values);
1414
1415         for ( i=0; i<num_values; i++ ) {
1416                 /* unpack the next regval */
1417
1418                 type = REG_NONE;
1419                 size = 0;
1420                 data_p = NULL;
1421                 valuename[0] = '\0';
1422                 len += tdb_unpack(buf+len, buflen-len, "fdB",
1423                                   valuename,
1424                                   &type,
1425                                   &size,
1426                                   &data_p);
1427
1428                 /* add the new value. Paranoid protective code -- make sure data_p is valid */
1429
1430                 if (*valuename && size && data_p) {
1431                         regval_ctr_addvalue(values, valuename, type,
1432                                         (const char *)data_p, size);
1433                 }
1434                 SAFE_FREE(data_p); /* 'B' option to tdb_unpack does a malloc() */
1435
1436                 DEBUG(8,("specific: [%s], len: %d\n", valuename, size));
1437         }
1438
1439         return len;
1440 }
1441
1442 /****************************************************************************
1443  Pack all values in all printer keys
1444  ***************************************************************************/
1445
1446 static int regdb_pack_values(REGVAL_CTR *values, uint8 *buf, int buflen)
1447 {
1448         int             len = 0;
1449         int             i;
1450         REGISTRY_VALUE  *val;
1451         int             num_values;
1452
1453         if ( !values )
1454                 return 0;
1455
1456         num_values = regval_ctr_numvals( values );
1457
1458         /* pack the number of values first */
1459
1460         len += tdb_pack( buf+len, buflen-len, "d", num_values );
1461
1462         /* loop over all values */
1463
1464         for ( i=0; i<num_values; i++ ) {
1465                 val = regval_ctr_specific_value( values, i );
1466                 len += tdb_pack(buf+len, buflen-len, "fdB",
1467                                 regval_name(val),
1468                                 regval_type(val),
1469                                 regval_size(val),
1470                                 regval_data_p(val) );
1471         }
1472
1473         return len;
1474 }
1475
1476 /***********************************************************************
1477  Retrieve an array of strings containing subkeys.  Memory should be
1478  released by the caller.
1479  ***********************************************************************/
1480
1481 int regdb_fetch_values( const char* key, REGVAL_CTR *values )
1482 {
1483         char *keystr = NULL;
1484         TALLOC_CTX *ctx = talloc_stackframe();
1485         int ret = 0;
1486         TDB_DATA value;
1487
1488         DEBUG(10,("regdb_fetch_values: Looking for value of key [%s] \n", key));
1489
1490         if (!regdb_key_exists(key)) {
1491                 goto done;
1492         }
1493
1494         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key);
1495         if (!keystr) {
1496                 goto done;
1497         }
1498
1499         values->seqnum = regdb_get_seqnum();
1500
1501         value = regdb_fetch_key_internal(ctx, keystr);
1502
1503         if (!value.dptr) {
1504                 /* all keys have zero values by default */
1505                 goto done;
1506         }
1507
1508         regdb_unpack_values(values, value.dptr, value.dsize);
1509         ret = regval_ctr_numvals(values);
1510
1511 done:
1512         TALLOC_FREE(ctx);
1513         return ret;
1514 }
1515
1516 bool regdb_store_values( const char *key, REGVAL_CTR *values )
1517 {
1518         TDB_DATA old_data, data;
1519         char *keystr = NULL;
1520         TALLOC_CTX *ctx = talloc_stackframe();
1521         int len;
1522         NTSTATUS status;
1523         bool result = false;
1524
1525         DEBUG(10,("regdb_store_values: Looking for value of key [%s] \n", key));
1526
1527         if (!regdb_key_exists(key)) {
1528                 goto done;
1529         }
1530
1531         ZERO_STRUCT(data);
1532
1533         len = regdb_pack_values(values, data.dptr, data.dsize);
1534         if (len <= 0) {
1535                 DEBUG(0,("regdb_store_values: unable to pack values. len <= 0\n"));
1536                 goto done;
1537         }
1538
1539         data.dptr = TALLOC_ARRAY(ctx, uint8, len);
1540         data.dsize = len;
1541
1542         len = regdb_pack_values(values, data.dptr, data.dsize);
1543
1544         SMB_ASSERT( len == data.dsize );
1545
1546         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key );
1547         if (!keystr) {
1548                 goto done;
1549         }
1550         keystr = normalize_reg_path(ctx, keystr);
1551         if (!keystr) {
1552                 goto done;
1553         }
1554
1555         old_data = dbwrap_fetch_bystring(regdb, ctx, keystr);
1556
1557         if ((old_data.dptr != NULL)
1558             && (old_data.dsize == data.dsize)
1559             && (memcmp(old_data.dptr, data.dptr, data.dsize) == 0))
1560         {
1561                 result = true;
1562                 goto done;
1563         }
1564
1565         status = dbwrap_trans_store_bystring(regdb, keystr, data, TDB_REPLACE);
1566
1567         result = NT_STATUS_IS_OK(status);
1568
1569 done:
1570         TALLOC_FREE(ctx);
1571         return result;
1572 }
1573
1574 static WERROR regdb_get_secdesc(TALLOC_CTX *mem_ctx, const char *key,
1575                                 struct security_descriptor **psecdesc)
1576 {
1577         char *tdbkey;
1578         TDB_DATA data;
1579         NTSTATUS status;
1580         TALLOC_CTX *tmp_ctx = talloc_stackframe();
1581         WERROR err = WERR_OK;
1582
1583         DEBUG(10, ("regdb_get_secdesc: Getting secdesc of key [%s]\n", key));
1584
1585         if (!regdb_key_exists(key)) {
1586                 err = WERR_BADFILE;
1587                 goto done;
1588         }
1589
1590         tdbkey = talloc_asprintf(tmp_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1591         if (tdbkey == NULL) {
1592                 err = WERR_NOMEM;
1593                 goto done;
1594         }
1595         normalize_dbkey(tdbkey);
1596
1597         data = dbwrap_fetch_bystring(regdb, tmp_ctx, tdbkey);
1598         if (data.dptr == NULL) {
1599                 err = WERR_BADFILE;
1600                 goto done;
1601         }
1602
1603         status = unmarshall_sec_desc(mem_ctx, (uint8 *)data.dptr, data.dsize,
1604                                      psecdesc);
1605
1606         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1607                 err = WERR_NOMEM;
1608         } else if (!NT_STATUS_IS_OK(status)) {
1609                 err = WERR_REG_CORRUPT;
1610         }
1611
1612 done:
1613         TALLOC_FREE(tmp_ctx);
1614         return err;
1615 }
1616
1617 static WERROR regdb_set_secdesc(const char *key,
1618                                 struct security_descriptor *secdesc)
1619 {
1620         TALLOC_CTX *mem_ctx = talloc_stackframe();
1621         char *tdbkey;
1622         WERROR err = WERR_NOMEM;
1623         TDB_DATA tdbdata;
1624
1625         if (!regdb_key_exists(key)) {
1626                 err = WERR_BADFILE;
1627                 goto done;
1628         }
1629
1630         tdbkey = talloc_asprintf(mem_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1631         if (tdbkey == NULL) {
1632                 goto done;
1633         }
1634         normalize_dbkey(tdbkey);
1635
1636         if (secdesc == NULL) {
1637                 /* assuming a delete */
1638                 err = ntstatus_to_werror(dbwrap_trans_delete_bystring(regdb,
1639                                                                       tdbkey));
1640                 goto done;
1641         }
1642
1643         err = ntstatus_to_werror(marshall_sec_desc(mem_ctx, secdesc,
1644                                                    &tdbdata.dptr,
1645                                                    &tdbdata.dsize));
1646         W_ERROR_NOT_OK_GOTO_DONE(err);
1647
1648         err = ntstatus_to_werror(dbwrap_trans_store_bystring(regdb, tdbkey,
1649                                                              tdbdata, 0));
1650
1651  done:
1652         TALLOC_FREE(mem_ctx);
1653         return err;
1654 }
1655
1656 bool regdb_subkeys_need_update(struct regsubkey_ctr *subkeys)
1657 {
1658         return (regdb_get_seqnum() != regsubkey_ctr_get_seqnum(subkeys));
1659 }
1660
1661 bool regdb_values_need_update(REGVAL_CTR *values)
1662 {
1663         return (regdb_get_seqnum() != values->seqnum);
1664 }
1665
1666 /*
1667  * Table of function pointers for default access
1668  */
1669
1670 REGISTRY_OPS regdb_ops = {
1671         .fetch_subkeys = regdb_fetch_keys,
1672         .fetch_values = regdb_fetch_values,
1673         .store_subkeys = regdb_store_keys,
1674         .store_values = regdb_store_values,
1675         .create_subkey = regdb_create_subkey,
1676         .delete_subkey = regdb_delete_subkey,
1677         .get_secdesc = regdb_get_secdesc,
1678         .set_secdesc = regdb_set_secdesc,
1679         .subkeys_need_update = regdb_subkeys_need_update,
1680         .values_need_update = regdb_values_need_update
1681 };