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(struct db_context *db, const char *key);
  31 static bool regdb_key_is_base_key(const char *key);
  32 static int regdb_fetch_keys_internal(struct db_context *db, const char *key,
  33                                      struct regsubkey_ctr *ctr);
  34
  35 /* List the deepest path into the registry.  All part components will be created.*/
  36
  37 /* If you want to have a part of the path controlled by the tdb and part by
  38    a virtual registry db (e.g. printing), then you have to list the deepest path.
  39    For example,"HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion/Print"
  40    allows the reg_db backend to handle everything up to
  41    "HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion" and then we'll hook
  42    the reg_printing backend onto the last component of the path (see
  43    KEY_PRINTING_2K in include/rpc_reg.h)   --jerry */
  44
  45 static const char *builtin_registry_paths[] = {
  46         KEY_PRINTING_2K,
  47         KEY_PRINTING_PORTS,
  48         KEY_PRINTING,
  49         KEY_SHARES,
  50         KEY_EVENTLOG,
  51         KEY_SMBCONF,
  52         KEY_PERFLIB,
  53         KEY_PERFLIB_009,
  54         KEY_GROUP_POLICY,
  55         KEY_SAMBA_GROUP_POLICY,
  56         KEY_GP_MACHINE_POLICY,
  57         KEY_GP_MACHINE_WIN_POLICY,
  58         KEY_HKCU,
  59         KEY_GP_USER_POLICY,
  60         KEY_GP_USER_WIN_POLICY,
  61         KEY_WINLOGON_GPEXT_PATH,
  62         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Print\\Monitors",
  63         KEY_PROD_OPTIONS,
  64         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Terminal Server\\DefaultUserConfiguration",
  65         KEY_TCPIP_PARAMS,
  66         KEY_NETLOGON_PARAMS,
  67         KEY_HKU,
  68         KEY_HKCR,
  69         KEY_HKPD,
  70         KEY_HKPT,
  71          NULL };
  72
  73 struct builtin_regkey_value {
  74         const char *path;
  75         const char *valuename;
  76         uint32 type;
  77         union {
  78                 const char *string;
  79                 uint32 dw_value;
  80         } data;
  81 };
  82
  83 static struct builtin_regkey_value builtin_registry_values[] = {
  84         { KEY_PRINTING_PORTS,
  85                 SAMBA_PRINTER_PORT_NAME, REG_SZ, { "" } },
  86         { KEY_PRINTING_2K,
  87                 "DefaultSpoolDirectory", REG_SZ, { "C:\\Windows\\System32\\Spool\\Printers" } },
  88         { KEY_EVENTLOG,
  89                 "DisplayName", REG_SZ, { "Event Log" } },
  90         { KEY_EVENTLOG,
  91                 "ErrorControl", REG_DWORD, { (char*)0x00000001 } },
  92         { NULL, NULL, 0, { NULL } }
  93 };
  94
  95 /**
  96  * Initialize a key in the registry:
  97  * create each component key of the specified path.
  98  */
  99 static WERROR init_registry_key_internal(const char *add_path)
 100 {
 101         WERROR werr;
 102         TALLOC_CTX *frame = talloc_stackframe();
 103         char *path = NULL;
 104         char *base = NULL;
 105         char *remaining = NULL;
 106         char *keyname;
 107         char *subkeyname;
 108         struct regsubkey_ctr *subkeys;
 109         const char *p, *p2;
 110
 111         DEBUG(6, ("init_registry_key: Adding [%s]\n", add_path));
 112
 113         path = talloc_strdup(frame, add_path);
 114         base = talloc_strdup(frame, "");
 115         if (!path || !base) {
 116                 werr = WERR_NOMEM;
 117                 goto fail;
 118         }
 119         p = path;
 120
 121         while (next_token_talloc(frame, &p, &keyname, "\\")) {
 122
 123                 /* build up the registry path from the components */
 124
 125                 if (*base) {
 126                         base = talloc_asprintf(frame, "%s\\", base);
 127                         if (!base) {
 128                                 werr = WERR_NOMEM;
 129                                 goto fail;
 130                         }
 131                 }
 132                 base = talloc_asprintf_append(base, "%s", keyname);
 133                 if (!base) {
 134                         werr = WERR_NOMEM;
 135                         goto fail;
 136                 }
 137
 138                 /* get the immediate subkeyname (if we have one ) */
 139
 140                 subkeyname = talloc_strdup(frame, "");
 141                 if (!subkeyname) {
 142                         werr = WERR_NOMEM;
 143                         goto fail;
 144                 }
 145                 if (*p) {
 146                         remaining = talloc_strdup(frame, p);
 147                         if (!remaining) {
 148                                 werr = WERR_NOMEM;
 149                                 goto fail;
 150                         }
 151                         p2 = remaining;
 152
 153                         if (!next_token_talloc(frame, &p2,
 154                                                 &subkeyname, "\\"))
 155                         {
 156                                 subkeyname = talloc_strdup(frame,p2);
 157                                 if (!subkeyname) {
 158                                         werr = WERR_NOMEM;
 159                                         goto fail;
 160                                 }
 161                         }
 162                 }
 163
 164                 DEBUG(10,("init_registry_key: Storing key [%s] with "
 165                           "subkey [%s]\n", base,
 166                           *subkeyname ? subkeyname : "NULL"));
 167
 168                 /* we don't really care if the lookup succeeds or not
 169                  * since we are about to update the record.
 170                  * We just want any subkeys already present */
 171
 172                 werr = regsubkey_ctr_init(frame, &subkeys);
 173                 if (!W_ERROR_IS_OK(werr)) {
 174                         DEBUG(0,("talloc() failure!\n"));
 175                         goto fail;
 176                 }
 177
 178                 regdb_fetch_keys_internal(regdb, base, subkeys);
 179                 if (*subkeyname) {
 180                         werr = regsubkey_ctr_addkey(subkeys, subkeyname);
 181                         if (!W_ERROR_IS_OK(werr)) {
 182                                 goto fail;
 183                         }
 184                 }
 185                 if (!regdb_store_keys( base, subkeys)) {
 186                         werr = WERR_CAN_NOT_COMPLETE;
 187                         goto fail;
 188                 }
 189         }
 190
 191         werr = WERR_OK;
 192
 193 fail:
 194         TALLOC_FREE(frame);
 195         return werr;
 196 }
 197
 198 /**
 199  * Initialize a key in the registry:
 200  * create each component key of the specified path,
 201  * wrapped in one db transaction.
 202  */
 203 WERROR init_registry_key(const char *add_path)
 204 {
 205         WERROR werr;
 206
 207         if (regdb_key_exists(regdb, add_path)) {
 208                 return WERR_OK;
 209         }
 210
 211         if (regdb->transaction_start(regdb) != 0) {
 212                 DEBUG(0, ("init_registry_key: transaction_start failed\n"));
 213                 return WERR_REG_IO_FAILURE;
 214         }
 215
 216         werr = init_registry_key_internal(add_path);
 217         if (!W_ERROR_IS_OK(werr)) {
 218                 goto fail;
 219         }
 220
 221         if (regdb->transaction_commit(regdb) != 0) {
 222                 DEBUG(0, ("init_registry_key: Could not commit transaction\n"));
 223                 return WERR_REG_IO_FAILURE;
 224         }
 225
 226         return WERR_OK;
 227
 228 fail:
 229         if (regdb->transaction_cancel(regdb) != 0) {
 230                 smb_panic("init_registry_key: transaction_cancel failed\n");
 231         }
 232
 233         return werr;
 234 }
 235
 236 /***********************************************************************
 237  Open the registry data in the tdb
 238  ***********************************************************************/
 239
 240 WERROR init_registry_data(void)
 241 {
 242         WERROR werr;
 243         TALLOC_CTX *frame = talloc_stackframe();
 244         struct regval_ctr *values;
 245         int i;
 246         UNISTR2 data;
 247
 248         /*
 249          * First, check for the existence of the needed keys and values.
 250          * If all do already exist, we can save the writes.
 251          */
 252         for (i=0; builtin_registry_paths[i] != NULL; i++) {
 253                 if (!regdb_key_exists(regdb, builtin_registry_paths[i])) {
 254                         goto do_init;
 255                 }
 256         }
 257
 258         for (i=0; builtin_registry_values[i].path != NULL; i++) {
 259                 values = TALLOC_ZERO_P(frame, struct regval_ctr);
 260                 if (values == NULL) {
 261                         werr = WERR_NOMEM;
 262                         goto done;
 263                 }
 264
 265                 regdb_fetch_values(builtin_registry_values[i].path, values);
 266                 if (!regval_ctr_key_exists(values,
 267                                         builtin_registry_values[i].valuename))
 268                 {
 269                         TALLOC_FREE(values);
 270                         goto do_init;
 271                 }
 272
 273                 TALLOC_FREE(values);
 274         }
 275
 276         werr = WERR_OK;
 277         goto done;
 278
 279 do_init:
 280
 281         /*
 282          * There are potentially quite a few store operations which are all
 283          * indiviually wrapped in tdb transactions. Wrapping them in a single
 284          * transaction gives just a single transaction_commit() to actually do
 285          * its fsync()s. See tdb/common/transaction.c for info about nested
 286          * transaction behaviour.
 287          */
 288
 289         if (regdb->transaction_start(regdb) != 0) {
 290                 DEBUG(0, ("init_registry_data: tdb_transaction_start "
 291                           "failed\n"));
 292                 werr = WERR_REG_IO_FAILURE;
 293                 goto done;
 294         }
 295
 296         /* loop over all of the predefined paths and add each component */
 297
 298         for (i=0; builtin_registry_paths[i] != NULL; i++) {
 299                 if (regdb_key_exists(regdb, builtin_registry_paths[i])) {
 300                         continue;
 301                 }
 302                 werr = init_registry_key_internal(builtin_registry_paths[i]);
 303                 if (!W_ERROR_IS_OK(werr)) {
 304                         goto fail;
 305                 }
 306         }
 307
 308         /* loop over all of the predefined values and add each component */
 309
 310         for (i=0; builtin_registry_values[i].path != NULL; i++) {
 311
 312                 values = TALLOC_ZERO_P(frame, struct regval_ctr);
 313                 if (values == NULL) {
 314                         werr = WERR_NOMEM;
 315                         goto fail;
 316                 }
 317
 318                 regdb_fetch_values(builtin_registry_values[i].path, values);
 319
 320                 /* preserve existing values across restarts. Only add new ones */
 321
 322                 if (!regval_ctr_key_exists(values,
 323                                         builtin_registry_values[i].valuename))
 324                 {
 325                         switch(builtin_registry_values[i].type) {
 326                         case REG_DWORD:
 327                                 regval_ctr_addvalue(values,
 328                                         builtin_registry_values[i].valuename,
 329                                         REG_DWORD,
 330                                         (char*)&builtin_registry_values[i].data.dw_value,
 331                                         sizeof(uint32));
 332                                 break;
 333
 334                         case REG_SZ:
 335                                 init_unistr2(&data,
 336                                         builtin_registry_values[i].data.string,
 337                                         UNI_STR_TERMINATE);
 338                                 regval_ctr_addvalue(values,
 339                                         builtin_registry_values[i].valuename,
 340                                         REG_SZ,
 341                                         (char*)data.buffer,
 342                                         data.uni_str_len*sizeof(uint16));
 343                                 break;
 344
 345                         default:
 346                                 DEBUG(0, ("init_registry_data: invalid value "
 347                                           "type in builtin_registry_values "
 348                                           "[%d]\n",
 349                                           builtin_registry_values[i].type));
 350                         }
 351                         regdb_store_values(builtin_registry_values[i].path,
 352                                            values);
 353                 }
 354                 TALLOC_FREE(values);
 355         }
 356
 357         if (regdb->transaction_commit(regdb) != 0) {
 358                 DEBUG(0, ("init_registry_data: Could not commit "
 359                           "transaction\n"));
 360                 werr = WERR_REG_IO_FAILURE;
 361         } else {
 362                 werr = WERR_OK;
 363         }
 364
 365         goto done;
 366
 367 fail:
 368         if (regdb->transaction_cancel(regdb) != 0) {
 369                 smb_panic("init_registry_data: tdb_transaction_cancel "
 370                           "failed\n");
 371         }
 372
 373 done:
 374         TALLOC_FREE(frame);
 375         return werr;
 376 }
 377
 378 /***********************************************************************
 379  Open the registry database
 380  ***********************************************************************/
 381
 382 WERROR regdb_init(void)
 383 {
 384         const char *vstring = "INFO/version";
 385         uint32 vers_id;
 386         WERROR werr;
 387
 388         if (regdb) {
 389                 DEBUG(10, ("regdb_init: incrementing refcount (%d)\n",
 390                           regdb_refcount));
 391                 regdb_refcount++;
 392                 return WERR_OK;
 393         }
 394
 395         regdb = db_open(NULL, state_path("registry.tdb"), 0,
 396                               REG_TDB_FLAGS, O_RDWR, 0600);
 397         if (!regdb) {
 398                 regdb = db_open(NULL, state_path("registry.tdb"), 0,
 399                                       REG_TDB_FLAGS, O_RDWR|O_CREAT, 0600);
 400                 if (!regdb) {
 401                         werr = ntstatus_to_werror(map_nt_error_from_unix(errno));
 402                         DEBUG(1,("regdb_init: Failed to open registry %s (%s)\n",
 403                                 state_path("registry.tdb"), strerror(errno) ));
 404                         return werr;
 405                 }
 406
 407                 DEBUG(10,("regdb_init: Successfully created registry tdb\n"));
 408         }
 409
 410         regdb_refcount = 1;
 411
 412         vers_id = dbwrap_fetch_int32(regdb, vstring);
 413
 414         if ( vers_id != REGVER_V1 ) {
 415                 NTSTATUS status;
 416                 /* any upgrade code here if needed */
 417                 DEBUG(10, ("regdb_init: got %s = %d != %d\n", vstring,
 418                            vers_id, REGVER_V1));
 419                 status = dbwrap_trans_store_int32(regdb, vstring, REGVER_V1);
 420                 if (!NT_STATUS_IS_OK(status)) {
 421                         DEBUG(1, ("regdb_init: error storing %s = %d: %s\n",
 422                                   vstring, REGVER_V1, nt_errstr(status)));
 423                         return ntstatus_to_werror(status);
 424                 } else {
 425                         DEBUG(10, ("regdb_init: stored %s = %d\n",
 426                                   vstring, REGVER_V1));
 427                 }
 428         }
 429
 430         return WERR_OK;
 431 }
 432
 433 /***********************************************************************
 434  Open the registry.  Must already have been initialized by regdb_init()
 435  ***********************************************************************/
 436
 437 WERROR regdb_open( void )
 438 {
 439         WERROR result = WERR_OK;
 440
 441         if ( regdb ) {
 442                 DEBUG(10,("regdb_open: incrementing refcount (%d)\n", regdb_refcount));
 443                 regdb_refcount++;
 444                 return WERR_OK;
 445         }
 446
 447         become_root();
 448
 449         regdb = db_open(NULL, state_path("registry.tdb"), 0,
 450                               REG_TDB_FLAGS, O_RDWR, 0600);
 451         if ( !regdb ) {
 452                 result = ntstatus_to_werror( map_nt_error_from_unix( errno ) );
 453                 DEBUG(0,("regdb_open: Failed to open %s! (%s)\n",
 454                         state_path("registry.tdb"), strerror(errno) ));
 455         }
 456
 457         unbecome_root();
 458
 459         regdb_refcount = 1;
 460         DEBUG(10,("regdb_open: refcount reset (%d)\n", regdb_refcount));
 461
 462         return result;
 463 }
 464
 465 /***********************************************************************
 466  ***********************************************************************/
 467
 468 int regdb_close( void )
 469 {
 470         if (regdb_refcount == 0) {
 471                 return 0;
 472         }
 473
 474         regdb_refcount--;
 475
 476         DEBUG(10,("regdb_close: decrementing refcount (%d)\n", regdb_refcount));
 477
 478         if ( regdb_refcount > 0 )
 479                 return 0;
 480
 481         SMB_ASSERT( regdb_refcount >= 0 );
 482
 483         TALLOC_FREE(regdb);
 484         return 0;
 485 }
 486
 487 WERROR regdb_transaction_start(void)
 488 {
 489         return (regdb->transaction_start(regdb) == 0) ?
 490                 WERR_OK : WERR_REG_IO_FAILURE;
 491 }
 492
 493 WERROR regdb_transaction_commit(void)
 494 {
 495         return (regdb->transaction_commit(regdb) == 0) ?
 496                 WERR_OK : WERR_REG_IO_FAILURE;
 497 }
 498
 499 WERROR regdb_transaction_cancel(void)
 500 {
 501         return (regdb->transaction_cancel(regdb) == 0) ?
 502                 WERR_OK : WERR_REG_IO_FAILURE;
 503 }
 504
 505 /***********************************************************************
 506  return the tdb sequence number of the registry tdb.
 507  this is an indicator for the content of the registry
 508  having changed. it will change upon regdb_init, too, though.
 509  ***********************************************************************/
 510 int regdb_get_seqnum(void)
 511 {
 512         return regdb->get_seqnum(regdb);
 513 }
 514
 515
 516 static WERROR regdb_delete_key_with_prefix(struct db_context *db,
 517                                            const char *keyname,
 518                                            const char *prefix)
 519 {
 520         char *path;
 521         WERROR werr = WERR_NOMEM;
 522         TALLOC_CTX *mem_ctx = talloc_stackframe();
 523
 524         if (keyname == NULL) {
 525                 werr = WERR_INVALID_PARAM;
 526                 goto done;
 527         }
 528
 529         if (prefix == NULL) {
 530                 path = discard_const_p(char, keyname);
 531         } else {
 532                 path = talloc_asprintf(mem_ctx, "%s/%s", prefix, keyname);
 533                 if (path == NULL) {
 534                         goto done;
 535                 }
 536         }
 537
 538         path = normalize_reg_path(mem_ctx, path);
 539         if (path == NULL) {
 540                 goto done;
 541         }
 542
 543         werr = ntstatus_to_werror(dbwrap_delete_bystring(db, path));
 544
 545         /* treat "not" found" as ok */
 546         if (W_ERROR_EQUAL(werr, WERR_NOT_FOUND)) {
 547                 werr = WERR_OK;
 548         }
 549
 550 done:
 551         talloc_free(mem_ctx);
 552         return werr;
 553 }
 554
 555
 556 static WERROR regdb_delete_values(struct db_context *db, const char *keyname)
 557 {
 558         return regdb_delete_key_with_prefix(db, keyname, REG_VALUE_PREFIX);
 559 }
 560
 561 static WERROR regdb_delete_secdesc(struct db_context *db, const char *keyname)
 562 {
 563         return regdb_delete_key_with_prefix(db, keyname, REG_SECDESC_PREFIX);
 564 }
 565
 566 static WERROR regdb_delete_subkeylist(struct db_context *db, const char *keyname)
 567 {
 568         return regdb_delete_key_with_prefix(db, keyname, NULL);
 569 }
 570
 571 static WERROR regdb_delete_key_lists(struct db_context *db, const char *keyname)
 572 {
 573         WERROR werr;
 574
 575         werr = regdb_delete_values(db, keyname);
 576         if (!W_ERROR_IS_OK(werr)) {
 577                 DEBUG(1, (__location__ " Deleting %s/%s failed: %s\n",
 578                           REG_VALUE_PREFIX, keyname, win_errstr(werr)));
 579                 goto done;
 580         }
 581
 582         werr = regdb_delete_secdesc(db, keyname);
 583         if (!W_ERROR_IS_OK(werr)) {
 584                 DEBUG(1, (__location__ " Deleting %s/%s failed: %s\n",
 585                           REG_SECDESC_PREFIX, keyname, win_errstr(werr)));
 586                 goto done;
 587         }
 588
 589         werr = regdb_delete_subkeylist(db, keyname);
 590         if (!W_ERROR_IS_OK(werr)) {
 591                 DEBUG(1, (__location__ " Deleting %s failed: %s\n",
 592                           keyname, win_errstr(werr)));
 593                 goto done;
 594         }
 595
 596 done:
 597         return werr;
 598 }
 599
 600 /***********************************************************************
 601  Add subkey strings to the registry tdb under a defined key
 602  fmt is the same format as tdb_pack except this function only supports
 603  fstrings
 604  ***********************************************************************/
 605
 606 static bool regdb_store_keys_internal2(struct db_context *db,
 607                                        const char *key,
 608                                        struct regsubkey_ctr *ctr)
 609 {
 610         TDB_DATA dbuf;
 611         uint8 *buffer = NULL;
 612         int i = 0;
 613         uint32 len, buflen;
 614         bool ret = true;
 615         uint32 num_subkeys = regsubkey_ctr_numkeys(ctr);
 616         char *keyname = NULL;
 617         TALLOC_CTX *ctx = talloc_stackframe();
 618         NTSTATUS status;
 619
 620         if (!key) {
 621                 return false;
 622         }
 623
 624         keyname = talloc_strdup(ctx, key);
 625         if (!keyname) {
 626                 return false;
 627         }
 628         keyname = normalize_reg_path(ctx, keyname);
 629
 630         /* allocate some initial memory */
 631
 632         buffer = (uint8 *)SMB_MALLOC(1024);
 633         if (buffer == NULL) {
 634                 return false;
 635         }
 636         buflen = 1024;
 637         len = 0;
 638
 639         /* store the number of subkeys */
 640
 641         len += tdb_pack(buffer+len, buflen-len, "d", num_subkeys);
 642
 643         /* pack all the strings */
 644
 645         for (i=0; i<num_subkeys; i++) {
 646                 size_t thistime;
 647
 648                 thistime = tdb_pack(buffer+len, buflen-len, "f",
 649                                     regsubkey_ctr_specific_key(ctr, i));
 650                 if (len+thistime > buflen) {
 651                         size_t thistime2;
 652                         /*
 653                          * tdb_pack hasn't done anything because of the short
 654                          * buffer, allocate extra space.
 655                          */
 656                         buffer = SMB_REALLOC_ARRAY(buffer, uint8_t,
 657                                                    (len+thistime)*2);
 658                         if(buffer == NULL) {
 659                                 DEBUG(0, ("regdb_store_keys: Failed to realloc "
 660                                           "memory of size [%u]\n",
 661                                           (unsigned int)(len+thistime)*2));
 662                                 ret = false;
 663                                 goto done;
 664                         }
 665                         buflen = (len+thistime)*2;
 666                         thistime2 = tdb_pack(
 667                                 buffer+len, buflen-len, "f",
 668                                 regsubkey_ctr_specific_key(ctr, i));
 669                         if (thistime2 != thistime) {
 670                                 DEBUG(0, ("tdb_pack failed\n"));
 671                                 ret = false;
 672                                 goto done;
 673                         }
 674                 }
 675                 len += thistime;
 676         }
 677
 678         /* finally write out the data */
 679
 680         dbuf.dptr = buffer;
 681         dbuf.dsize = len;
 682         status = dbwrap_store_bystring(db, keyname, dbuf, TDB_REPLACE);
 683         if (!NT_STATUS_IS_OK(status)) {
 684                 ret = false;
 685                 goto done;
 686         }
 687
 688         /*
 689          * Delete a sorted subkey cache for regdb_key_exists, will be
 690          * recreated automatically
 691          */
 692         keyname = talloc_asprintf(ctx, "%s/%s", REG_SORTED_SUBKEYS_PREFIX,
 693                                   keyname);
 694         if (keyname != NULL) {
 695                 dbwrap_delete_bystring(db, keyname);
 696         }
 697
 698 done:
 699         TALLOC_FREE(ctx);
 700         SAFE_FREE(buffer);
 701         return ret;
 702 }
 703
 704 /***********************************************************************
 705  Store the new subkey record and create any child key records that
 706  do not currently exist
 707  ***********************************************************************/
 708
 709 bool regdb_store_keys(const char *key, struct regsubkey_ctr *ctr)
 710 {
 711         int num_subkeys, old_num_subkeys, i;
 712         char *path = NULL;
 713         struct regsubkey_ctr *subkeys = NULL, *old_subkeys = NULL;
 714         char *oldkeyname = NULL;
 715         TALLOC_CTX *ctx = talloc_stackframe();
 716         WERROR werr;
 717
 718         if (!regdb_key_is_base_key(key) && !regdb_key_exists(regdb, key)) {
 719                 goto fail;
 720         }
 721
 722         /*
 723          * fetch a list of the old subkeys so we can determine if anything has
 724          * changed
 725          */
 726
 727         werr = regsubkey_ctr_init(ctx, &old_subkeys);
 728         if (!W_ERROR_IS_OK(werr)) {
 729                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 730                 return false;
 731         }
 732
 733         regdb_fetch_keys_internal(regdb, key, old_subkeys);
 734
 735         num_subkeys = regsubkey_ctr_numkeys(ctr);
 736         old_num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
 737         if ((num_subkeys && old_num_subkeys) &&
 738             (num_subkeys == old_num_subkeys)) {
 739
 740                 for (i = 0; i < num_subkeys; i++) {
 741                         if (strcmp(regsubkey_ctr_specific_key(ctr, i),
 742                                    regsubkey_ctr_specific_key(old_subkeys, i))
 743                             != 0)
 744                         {
 745                                 break;
 746                         }
 747                 }
 748                 if (i == num_subkeys) {
 749                         /*
 750                          * Nothing changed, no point to even start a tdb
 751                          * transaction
 752                          */
 753                         TALLOC_FREE(old_subkeys);
 754                         return true;
 755                 }
 756         }
 757
 758         TALLOC_FREE(old_subkeys);
 759
 760         if (regdb->transaction_start(regdb) != 0) {
 761                 DEBUG(0, ("regdb_store_keys: transaction_start failed\n"));
 762                 goto fail;
 763         }
 764
 765         /*
 766          * Re-fetch the old keys inside the transaction
 767          */
 768
 769         werr = regsubkey_ctr_init(ctx, &old_subkeys);
 770         if (!W_ERROR_IS_OK(werr)) {
 771                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 772                 goto cancel;
 773         }
 774
 775         regdb_fetch_keys_internal(regdb, key, old_subkeys);
 776
 777         /*
 778          * Make the store operation as safe as possible without transactions:
 779          *
 780          * (1) For each subkey removed from ctr compared with old_subkeys:
 781          *
 782          *     (a) First delete the value db entry.
 783          *
 784          *     (b) Next delete the secdesc db record.
 785          *
 786          *     (c) Then delete the subkey list entry.
 787          *
 788          * (2) Now write the list of subkeys of the parent key,
 789          *     deleting removed entries and adding new ones.
 790          *
 791          * (3) Finally create the subkey list entries for the added keys.
 792          *
 793          * This way if we crash half-way in between deleting the subkeys
 794          * and storing the parent's list of subkeys, no old data can pop up
 795          * out of the blue when re-adding keys later on.
 796          */
 797
 798         /* (1) delete removed keys' lists (values/secdesc/subkeys) */
 799
 800         num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
 801         for (i=0; i<num_subkeys; i++) {
 802                 oldkeyname = regsubkey_ctr_specific_key(old_subkeys, i);
 803
 804                 if (regsubkey_ctr_key_exists(ctr, oldkeyname)) {
 805                         /*
 806                          * It's still around, don't delete
 807                          */
 808
 809                         continue;
 810                 }
 811
 812                 path = talloc_asprintf(ctx, "%s/%s", key, oldkeyname);
 813                 if (!path) {
 814                         goto cancel;
 815                 }
 816
 817                 werr = regdb_delete_key_lists(regdb, path);
 818                 W_ERROR_NOT_OK_GOTO(werr, cancel);
 819
 820                 TALLOC_FREE(path);
 821         }
 822
 823         TALLOC_FREE(old_subkeys);
 824
 825         /* (2) store the subkey list for the parent */
 826
 827         if (!regdb_store_keys_internal2(regdb, key, ctr)) {
 828                 DEBUG(0,("regdb_store_keys: Failed to store new subkey list "
 829                          "for parent [%s]\n", key));
 830                 goto cancel;
 831         }
 832
 833         /* (3) now create records for any subkeys that don't already exist */
 834
 835         num_subkeys = regsubkey_ctr_numkeys(ctr);
 836
 837         if (num_subkeys == 0) {
 838                 werr = regsubkey_ctr_init(ctx, &subkeys);
 839                 if (!W_ERROR_IS_OK(werr)) {
 840                         DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 841                         goto cancel;
 842                 }
 843
 844                 if (!regdb_store_keys_internal2(regdb, key, subkeys)) {
 845                         DEBUG(0,("regdb_store_keys: Failed to store "
 846                                  "new record for key [%s]\n", key));
 847                         goto cancel;
 848                 }
 849                 TALLOC_FREE(subkeys);
 850
 851         }
 852
 853         for (i=0; i<num_subkeys; i++) {
 854                 path = talloc_asprintf(ctx, "%s/%s",
 855                                         key,
 856                                         regsubkey_ctr_specific_key(ctr, i));
 857                 if (!path) {
 858                         goto cancel;
 859                 }
 860                 werr = regsubkey_ctr_init(ctx, &subkeys);
 861                 if (!W_ERROR_IS_OK(werr)) {
 862                         DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 863                         goto cancel;
 864                 }
 865
 866                 if (regdb_fetch_keys_internal(regdb, path, subkeys) == -1) {
 867                         /* create a record with 0 subkeys */
 868                         if (!regdb_store_keys_internal2(regdb, path, subkeys)) {
 869                                 DEBUG(0,("regdb_store_keys: Failed to store "
 870                                          "new record for key [%s]\n", path));
 871                                 goto cancel;
 872                         }
 873                 }
 874
 875                 TALLOC_FREE(subkeys);
 876                 TALLOC_FREE(path);
 877         }
 878
 879         if (regdb->transaction_commit(regdb) != 0) {
 880                 DEBUG(0, ("regdb_store_keys: Could not commit transaction\n"));
 881                 goto fail;
 882         }
 883
 884         TALLOC_FREE(ctx);
 885         return true;
 886
 887 cancel:
 888         if (regdb->transaction_cancel(regdb) != 0) {
 889                 smb_panic("regdb_store_keys: transaction_cancel failed\n");
 890         }
 891
 892 fail:
 893         TALLOC_FREE(ctx);
 894
 895         return false;
 896 }
 897
 898 static WERROR regdb_create_subkey(const char *key, const char *subkey)
 899 {
 900         WERROR werr;
 901         struct regsubkey_ctr *subkeys;
 902         TALLOC_CTX *mem_ctx = talloc_stackframe();
 903
 904         if (!regdb_key_is_base_key(key) && !regdb_key_exists(regdb, key)) {
 905                 werr = WERR_NOT_FOUND;
 906                 goto done;
 907         }
 908
 909         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
 910         W_ERROR_NOT_OK_GOTO_DONE(werr);
 911
 912         if (regdb_fetch_keys_internal(regdb, key, subkeys) < 0) {
 913                 werr = WERR_REG_IO_FAILURE;
 914                 goto done;
 915         }
 916
 917         if (regsubkey_ctr_key_exists(subkeys, subkey)) {
 918                 werr = WERR_OK;
 919                 goto done;
 920         }
 921
 922         talloc_free(subkeys);
 923
 924         werr = regdb_transaction_start();
 925         W_ERROR_NOT_OK_GOTO_DONE(werr);
 926
 927         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
 928         W_ERROR_NOT_OK_GOTO(werr, cancel);
 929
 930         if (regdb_fetch_keys_internal(regdb, key, subkeys) < 0) {
 931                 werr = WERR_REG_IO_FAILURE;
 932                 goto cancel;
 933         }
 934
 935         werr = regsubkey_ctr_addkey(subkeys, subkey);
 936         W_ERROR_NOT_OK_GOTO(werr, cancel);
 937
 938         if (!regdb_store_keys_internal2(regdb, key, subkeys)) {
 939                 DEBUG(0, (__location__ " failed to store new subkey list for "
 940                          "parent key %s\n", key));
 941                 werr = WERR_REG_IO_FAILURE;
 942                 goto cancel;
 943         }
 944
 945         werr = regdb_transaction_commit();
 946         if (!W_ERROR_IS_OK(werr)) {
 947                 DEBUG(0, (__location__ " failed to commit transaction: %s\n",
 948                          win_errstr(werr)));
 949         }
 950
 951         goto done;
 952
 953 cancel:
 954         werr = regdb_transaction_cancel();
 955         if (!W_ERROR_IS_OK(werr)) {
 956                 DEBUG(0, (__location__ " failed to cancel transaction: %s\n",
 957                          win_errstr(werr)));
 958         }
 959
 960 done:
 961         talloc_free(mem_ctx);
 962         return werr;
 963 }
 964
 965 static WERROR regdb_delete_subkey(const char *key, const char *subkey)
 966 {
 967         WERROR werr, werr2;
 968         struct regsubkey_ctr *subkeys;
 969         char *path;
 970         TALLOC_CTX *mem_ctx = talloc_stackframe();
 971
 972         if (!regdb_key_is_base_key(key) && !regdb_key_exists(regdb, key)) {
 973                 werr = WERR_NOT_FOUND;
 974                 goto done;
 975         }
 976
 977         path = talloc_asprintf(mem_ctx, "%s/%s", key, subkey);
 978         if (path == NULL) {
 979                 werr = WERR_NOMEM;
 980                 goto done;
 981         }
 982
 983         if (!regdb_key_exists(regdb, path)) {
 984                 werr = WERR_OK;
 985                 goto done;
 986         }
 987
 988         werr = regdb_transaction_start();
 989         W_ERROR_NOT_OK_GOTO_DONE(werr);
 990
 991         werr = regdb_delete_key_lists(regdb, path);
 992         W_ERROR_NOT_OK_GOTO(werr, cancel);
 993
 994         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
 995         W_ERROR_NOT_OK_GOTO(werr, cancel);
 996
 997         if (regdb_fetch_keys_internal(regdb, key, subkeys) < 0) {
 998                 werr = WERR_REG_IO_FAILURE;
 999                 goto cancel;
1000         }
1001
1002         werr = regsubkey_ctr_delkey(subkeys, subkey);
1003         W_ERROR_NOT_OK_GOTO(werr, cancel);
1004
1005         if (!regdb_store_keys_internal2(regdb, key, subkeys)) {
1006                 DEBUG(0, (__location__ " failed to store new subkey_list for "
1007                          "parent key %s\n", key));
1008                 werr = WERR_REG_IO_FAILURE;
1009                 goto cancel;
1010         }
1011
1012         werr = regdb_transaction_commit();
1013         if (!W_ERROR_IS_OK(werr)) {
1014                 DEBUG(0, (__location__ " failed to commit transaction: %s\n",
1015                          win_errstr(werr)));
1016         }
1017
1018         goto done;
1019
1020 cancel:
1021         werr2 = regdb_transaction_cancel();
1022         if (!W_ERROR_IS_OK(werr2)) {
1023                 DEBUG(0, (__location__ " failed to cancel transaction: %s\n",
1024                          win_errstr(werr2)));
1025         }
1026
1027 done:
1028         talloc_free(mem_ctx);
1029         return werr;
1030 }
1031
1032 static TDB_DATA regdb_fetch_key_internal(struct db_context *db,
1033                                          TALLOC_CTX *mem_ctx, const char *key)
1034 {
1035         char *path = NULL;
1036         TDB_DATA data;
1037
1038         path = normalize_reg_path(mem_ctx, key);
1039         if (!path) {
1040                 return make_tdb_data(NULL, 0);
1041         }
1042
1043         data = dbwrap_fetch_bystring(db, mem_ctx, path);
1044
1045         TALLOC_FREE(path);
1046         return data;
1047 }
1048
1049
1050 /**
1051  * check whether a given key name represents a base key,
1052  * i.e one without a subkey separator ('/' or '\').
1053  */
1054 static bool regdb_key_is_base_key(const char *key)
1055 {
1056         TALLOC_CTX *mem_ctx = talloc_stackframe();
1057         bool ret = false;
1058         char *path;
1059
1060         if (key == NULL) {
1061                 goto done;
1062         }
1063
1064         path = normalize_reg_path(mem_ctx, key);
1065         if (path == NULL) {
1066                 DEBUG(0, ("out of memory! (talloc failed)\n"));
1067                 goto done;
1068         }
1069
1070         if (*path == '\0') {
1071                 goto done;
1072         }
1073
1074         ret = (strrchr(path, '/') == NULL);
1075
1076 done:
1077         TALLOC_FREE(mem_ctx);
1078         return ret;
1079 }
1080
1081 /*
1082  * regdb_key_exists() is a very frequent operation. It can be quite
1083  * time-consuming to fully fetch the parent's subkey list, talloc_strdup all
1084  * subkeys and then compare the keyname linearly to all the parent's subkeys.
1085  *
1086  * The following code tries to make this operation as efficient as possible:
1087  * Per registry key we create a list of subkeys that is very efficient to
1088  * search for existence of a subkey. Its format is:
1089  *
1090  * 4 bytes num_subkeys
1091  * 4*num_subkey bytes offset into the string array
1092  * then follows a sorted list of subkeys in uppercase
1093  *
1094  * This record is created by create_sorted_subkeys() on demand if it does not
1095  * exist. scan_parent_subkeys() uses regdb->parse_record to search the sorted
1096  * list, the parsing code and the binary search can be found in
1097  * parent_subkey_scanner. The code uses parse_record() to avoid a memcpy of
1098  * the potentially large subkey record.
1099  *
1100  * The sorted subkey record is deleted in regdb_store_keys_internal2 and
1101  * recreated on demand.
1102  */
1103
1104 static int cmp_keynames(const void *p1, const void *p2)
1105 {
1106         return StrCaseCmp(*((char **)p1), *((char **)p2));
1107 }
1108
1109 static bool create_sorted_subkeys(const char *key, const char *sorted_keyname)
1110 {
1111         char **sorted_subkeys;
1112         struct regsubkey_ctr *ctr;
1113         bool result = false;
1114         NTSTATUS status;
1115         char *buf;
1116         char *p;
1117         int i, res;
1118         size_t len;
1119         int num_subkeys;
1120         WERROR werr;
1121
1122         if (regdb->transaction_start(regdb) != 0) {
1123                 DEBUG(0, ("create_sorted_subkeys: transaction_start "
1124                           "failed\n"));
1125                 return false;
1126         }
1127
1128         werr = regsubkey_ctr_init(talloc_tos(), &ctr);
1129         if (!W_ERROR_IS_OK(werr)) {
1130                 goto fail;
1131         }
1132
1133         res = regdb_fetch_keys_internal(regdb, key, ctr);
1134         if (res == -1) {
1135                 goto fail;
1136         }
1137
1138         num_subkeys = regsubkey_ctr_numkeys(ctr);
1139         sorted_subkeys = talloc_array(ctr, char *, num_subkeys);
1140         if (sorted_subkeys == NULL) {
1141                 goto fail;
1142         }
1143
1144         len = 4 + 4*num_subkeys;
1145
1146         for (i = 0; i < num_subkeys; i++) {
1147                 sorted_subkeys[i] = talloc_strdup_upper(sorted_subkeys,
1148                                         regsubkey_ctr_specific_key(ctr, i));
1149                 if (sorted_subkeys[i] == NULL) {
1150                         goto fail;
1151                 }
1152                 len += strlen(sorted_subkeys[i])+1;
1153         }
1154
1155         qsort(sorted_subkeys, num_subkeys, sizeof(char *), cmp_keynames);
1156
1157         buf = talloc_array(ctr, char, len);
1158         if (buf == NULL) {
1159                 goto fail;
1160         }
1161         p = buf + 4 + 4*num_subkeys;
1162
1163         SIVAL(buf, 0, num_subkeys);
1164
1165         for (i=0; i < num_subkeys; i++) {
1166                 ptrdiff_t offset = p - buf;
1167                 SIVAL(buf, 4 + 4*i, offset);
1168                 strlcpy(p, sorted_subkeys[i], len-offset);
1169                 p += strlen(sorted_subkeys[i]) + 1;
1170         }
1171
1172         status = dbwrap_store_bystring(
1173                 regdb, sorted_keyname, make_tdb_data((uint8_t *)buf, len),
1174                 TDB_REPLACE);
1175         if (!NT_STATUS_IS_OK(status)) {
1176                 /*
1177                  * Don't use a "goto fail;" here, this would commit the broken
1178                  * transaction. See below for an explanation.
1179                  */
1180                 if (regdb->transaction_cancel(regdb) == -1) {
1181                         DEBUG(0, ("create_sorted_subkeys: transaction_cancel "
1182                                   "failed\n"));
1183                 }
1184                 TALLOC_FREE(ctr);
1185                 return false;
1186         }
1187
1188         result = true;
1189  fail:
1190         /*
1191          * We only get here via the "goto fail" when we did not write anything
1192          * yet. Using transaction_commit even in a failure case is necessary
1193          * because this (disposable) call might be nested in other
1194          * transactions. Doing a cancel here would destroy the possibility of
1195          * a transaction_commit for transactions that we might be wrapped in.
1196          */
1197         if (regdb->transaction_commit(regdb) == -1) {
1198                 DEBUG(0, ("create_sorted_subkeys: transaction_start "
1199                           "failed\n"));
1200                 goto fail;
1201         }
1202
1203         TALLOC_FREE(ctr);
1204         return result;
1205 }
1206
1207 struct scan_subkey_state {
1208         char *name;
1209         bool scanned;
1210         bool found;
1211 };
1212
1213 static int parent_subkey_scanner(TDB_DATA key, TDB_DATA data,
1214                                  void *private_data)
1215 {
1216         struct scan_subkey_state *state =
1217                 (struct scan_subkey_state *)private_data;
1218         uint32_t num_subkeys;
1219         uint32_t l, u;
1220
1221         if (data.dsize < sizeof(uint32_t)) {
1222                 return -1;
1223         }
1224
1225         state->scanned = true;
1226         state->found = false;
1227
1228         tdb_unpack(data.dptr, data.dsize, "d", &num_subkeys);
1229
1230         l = 0;
1231         u = num_subkeys;
1232
1233         while (l < u) {
1234                 uint32_t idx = (l+u)/2;
1235                 char *s = (char *)data.dptr + IVAL(data.dptr, 4 + 4*idx);
1236                 int comparison = strcmp(state->name, s);
1237
1238                 if (comparison < 0) {
1239                         u = idx;
1240                 } else if (comparison > 0) {
1241                         l = idx + 1;
1242                 } else {
1243                         state->found = true;
1244                         return 0;
1245                 }
1246         }
1247         return 0;
1248 }
1249
1250 static bool scan_parent_subkeys(struct db_context *db, const char *parent,
1251                                 const char *name)
1252 {
1253         char *path = NULL;
1254         char *key = NULL;
1255         struct scan_subkey_state state = { 0, };
1256         bool result = false;
1257         int res;
1258
1259         state.name = NULL;
1260
1261         path = normalize_reg_path(talloc_tos(), parent);
1262         if (path == NULL) {
1263                 goto fail;
1264         }
1265
1266         key = talloc_asprintf(talloc_tos(), "%s/%s",
1267                               REG_SORTED_SUBKEYS_PREFIX, path);
1268         if (key == NULL) {
1269                 goto fail;
1270         }
1271
1272         state.name = talloc_strdup_upper(talloc_tos(), name);
1273         if (state.name == NULL) {
1274                 goto fail;
1275         }
1276         state.scanned = false;
1277
1278         res = db->parse_record(db, string_term_tdb_data(key),
1279                                parent_subkey_scanner, &state);
1280
1281         if (state.scanned) {
1282                 result = state.found;
1283         } else {
1284                 if (!create_sorted_subkeys(path, key)) {
1285                         goto fail;
1286                 }
1287                 res = db->parse_record(db, string_term_tdb_data(key),
1288                                        parent_subkey_scanner, &state);
1289                 if ((res == 0) && (state.scanned)) {
1290                         result = state.found;
1291                 }
1292         }
1293
1294  fail:
1295         TALLOC_FREE(path);
1296         TALLOC_FREE(state.name);
1297         return result;
1298 }
1299
1300 /**
1301  * Check for the existence of a key.
1302  *
1303  * Existence of a key is authoritatively defined by its
1304  * existence in the list of subkeys of its parent key.
1305  * The exeption of this are keys without a parent key,
1306  * i.e. the "base" keys (HKLM, HKCU, ...).
1307  */
1308 static bool regdb_key_exists(struct db_context *db, const char *key)
1309 {
1310         TALLOC_CTX *mem_ctx = talloc_stackframe();
1311         TDB_DATA value;
1312         bool ret = false;
1313         char *path, *p;
1314
1315         if (key == NULL) {
1316                 goto done;
1317         }
1318
1319         path = normalize_reg_path(mem_ctx, key);
1320         if (path == NULL) {
1321                 DEBUG(0, ("out of memory! (talloc failed)\n"));
1322                 goto done;
1323         }
1324
1325         if (*path == '\0') {
1326                 goto done;
1327         }
1328
1329         p = strrchr(path, '/');
1330         if (p == NULL) {
1331                 /* this is a base key */
1332                 value = regdb_fetch_key_internal(db, mem_ctx, path);
1333                 ret = (value.dptr != NULL);
1334         } else {
1335                 *p = '\0';
1336                 ret = scan_parent_subkeys(db, path, p+1);
1337         }
1338
1339 done:
1340         TALLOC_FREE(mem_ctx);
1341         return ret;
1342 }
1343
1344
1345 /***********************************************************************
1346  Retrieve an array of strings containing subkeys.  Memory should be
1347  released by the caller.
1348  ***********************************************************************/
1349
1350 static int regdb_fetch_keys_internal(struct db_context *db, const char *key,
1351                                      struct regsubkey_ctr *ctr)
1352 {
1353         WERROR werr;
1354         uint32 num_items;
1355         uint8 *buf;
1356         uint32 buflen, len;
1357         int i;
1358         fstring subkeyname;
1359         int ret = -1;
1360         TALLOC_CTX *frame = talloc_stackframe();
1361         TDB_DATA value;
1362
1363         DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL"));
1364
1365         if (!regdb_key_exists(db, key)) {
1366                 goto done;
1367         }
1368
1369         werr = regsubkey_ctr_set_seqnum(ctr, db->get_seqnum(db));
1370         if (!W_ERROR_IS_OK(werr)) {
1371                 goto done;
1372         }
1373
1374         value = regdb_fetch_key_internal(db, frame, key);
1375
1376         if (value.dptr == NULL) {
1377                 DEBUG(10, ("regdb_fetch_keys: no subkeys found for key [%s]\n",
1378                            key));
1379                 ret = 0;
1380                 goto done;
1381         }
1382
1383         buf = value.dptr;
1384         buflen = value.dsize;
1385         len = tdb_unpack( buf, buflen, "d", &num_items);
1386
1387         for (i=0; i<num_items; i++) {
1388                 len += tdb_unpack(buf+len, buflen-len, "f", subkeyname);
1389                 werr = regsubkey_ctr_addkey(ctr, subkeyname);
1390                 if (!W_ERROR_IS_OK(werr)) {
1391                         DEBUG(5, ("regdb_fetch_keys: regsubkey_ctr_addkey "
1392                                   "failed: %s\n", win_errstr(werr)));
1393                         goto done;
1394                 }
1395         }
1396
1397         DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items));
1398
1399         ret = num_items;
1400 done:
1401         TALLOC_FREE(frame);
1402         return ret;
1403 }
1404
1405 int regdb_fetch_keys(const char *key, struct regsubkey_ctr *ctr)
1406 {
1407         return regdb_fetch_keys_internal(regdb, key, ctr);
1408 }
1409
1410 /****************************************************************************
1411  Unpack a list of registry values frem the TDB
1412  ***************************************************************************/
1413
1414 static int regdb_unpack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1415 {
1416         int             len = 0;
1417         uint32          type;
1418         fstring valuename;
1419         uint32          size;
1420         uint8           *data_p;
1421         uint32          num_values = 0;
1422         int             i;
1423
1424         /* loop and unpack the rest of the registry values */
1425
1426         len += tdb_unpack(buf+len, buflen-len, "d", &num_values);
1427
1428         for ( i=0; i<num_values; i++ ) {
1429                 /* unpack the next regval */
1430
1431                 type = REG_NONE;
1432                 size = 0;
1433                 data_p = NULL;
1434                 valuename[0] = '\0';
1435                 len += tdb_unpack(buf+len, buflen-len, "fdB",
1436                                   valuename,
1437                                   &type,
1438                                   &size,
1439                                   &data_p);
1440
1441                 /* add the new value. Paranoid protective code -- make sure data_p is valid */
1442
1443                 if (*valuename && size && data_p) {
1444                         regval_ctr_addvalue(values, valuename, type,
1445                                         (const char *)data_p, size);
1446                 }
1447                 SAFE_FREE(data_p); /* 'B' option to tdb_unpack does a malloc() */
1448
1449                 DEBUG(8,("specific: [%s], len: %d\n", valuename, size));
1450         }
1451
1452         return len;
1453 }
1454
1455 /****************************************************************************
1456  Pack all values in all printer keys
1457  ***************************************************************************/
1458
1459 static int regdb_pack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1460 {
1461         int             len = 0;
1462         int             i;
1463         struct regval_blob      *val;
1464         int             num_values;
1465
1466         if ( !values )
1467                 return 0;
1468
1469         num_values = regval_ctr_numvals( values );
1470
1471         /* pack the number of values first */
1472
1473         len += tdb_pack( buf+len, buflen-len, "d", num_values );
1474
1475         /* loop over all values */
1476
1477         for ( i=0; i<num_values; i++ ) {
1478                 val = regval_ctr_specific_value( values, i );
1479                 len += tdb_pack(buf+len, buflen-len, "fdB",
1480                                 regval_name(val),
1481                                 regval_type(val),
1482                                 regval_size(val),
1483                                 regval_data_p(val) );
1484         }
1485
1486         return len;
1487 }
1488
1489 /***********************************************************************
1490  Retrieve an array of strings containing subkeys.  Memory should be
1491  released by the caller.
1492  ***********************************************************************/
1493
1494 int regdb_fetch_values(const char* key, struct regval_ctr *values)
1495 {
1496         char *keystr = NULL;
1497         TALLOC_CTX *ctx = talloc_stackframe();
1498         int ret = 0;
1499         TDB_DATA value;
1500
1501         DEBUG(10,("regdb_fetch_values: Looking for value of key [%s] \n", key));
1502
1503         if (!regdb_key_exists(regdb, key)) {
1504                 goto done;
1505         }
1506
1507         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key);
1508         if (!keystr) {
1509                 goto done;
1510         }
1511
1512         values->seqnum = regdb_get_seqnum();
1513
1514         value = regdb_fetch_key_internal(regdb, ctx, keystr);
1515
1516         if (!value.dptr) {
1517                 /* all keys have zero values by default */
1518                 goto done;
1519         }
1520
1521         regdb_unpack_values(values, value.dptr, value.dsize);
1522         ret = regval_ctr_numvals(values);
1523
1524 done:
1525         TALLOC_FREE(ctx);
1526         return ret;
1527 }
1528
1529 bool regdb_store_values(const char *key, struct regval_ctr *values)
1530 {
1531         TDB_DATA old_data, data;
1532         char *keystr = NULL;
1533         TALLOC_CTX *ctx = talloc_stackframe();
1534         int len;
1535         NTSTATUS status;
1536         bool result = false;
1537
1538         DEBUG(10,("regdb_store_values: Looking for value of key [%s] \n", key));
1539
1540         if (!regdb_key_exists(regdb, key)) {
1541                 goto done;
1542         }
1543
1544         ZERO_STRUCT(data);
1545
1546         len = regdb_pack_values(values, data.dptr, data.dsize);
1547         if (len <= 0) {
1548                 DEBUG(0,("regdb_store_values: unable to pack values. len <= 0\n"));
1549                 goto done;
1550         }
1551
1552         data.dptr = TALLOC_ARRAY(ctx, uint8, len);
1553         data.dsize = len;
1554
1555         len = regdb_pack_values(values, data.dptr, data.dsize);
1556
1557         SMB_ASSERT( len == data.dsize );
1558
1559         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key );
1560         if (!keystr) {
1561                 goto done;
1562         }
1563         keystr = normalize_reg_path(ctx, keystr);
1564         if (!keystr) {
1565                 goto done;
1566         }
1567
1568         old_data = dbwrap_fetch_bystring(regdb, ctx, keystr);
1569
1570         if ((old_data.dptr != NULL)
1571             && (old_data.dsize == data.dsize)
1572             && (memcmp(old_data.dptr, data.dptr, data.dsize) == 0))
1573         {
1574                 result = true;
1575                 goto done;
1576         }
1577
1578         status = dbwrap_trans_store_bystring(regdb, keystr, data, TDB_REPLACE);
1579
1580         result = NT_STATUS_IS_OK(status);
1581
1582 done:
1583         TALLOC_FREE(ctx);
1584         return result;
1585 }
1586
1587 static WERROR regdb_get_secdesc(TALLOC_CTX *mem_ctx, const char *key,
1588                                 struct security_descriptor **psecdesc)
1589 {
1590         char *tdbkey;
1591         TDB_DATA data;
1592         NTSTATUS status;
1593         TALLOC_CTX *tmp_ctx = talloc_stackframe();
1594         WERROR err = WERR_OK;
1595
1596         DEBUG(10, ("regdb_get_secdesc: Getting secdesc of key [%s]\n", key));
1597
1598         if (!regdb_key_exists(regdb, key)) {
1599                 err = WERR_BADFILE;
1600                 goto done;
1601         }
1602
1603         tdbkey = talloc_asprintf(tmp_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1604         if (tdbkey == NULL) {
1605                 err = WERR_NOMEM;
1606                 goto done;
1607         }
1608         normalize_dbkey(tdbkey);
1609
1610         data = dbwrap_fetch_bystring(regdb, tmp_ctx, tdbkey);
1611         if (data.dptr == NULL) {
1612                 err = WERR_BADFILE;
1613                 goto done;
1614         }
1615
1616         status = unmarshall_sec_desc(mem_ctx, (uint8 *)data.dptr, data.dsize,
1617                                      psecdesc);
1618
1619         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1620                 err = WERR_NOMEM;
1621         } else if (!NT_STATUS_IS_OK(status)) {
1622                 err = WERR_REG_CORRUPT;
1623         }
1624
1625 done:
1626         TALLOC_FREE(tmp_ctx);
1627         return err;
1628 }
1629
1630 static WERROR regdb_set_secdesc(const char *key,
1631                                 struct security_descriptor *secdesc)
1632 {
1633         TALLOC_CTX *mem_ctx = talloc_stackframe();
1634         char *tdbkey;
1635         WERROR err = WERR_NOMEM;
1636         TDB_DATA tdbdata;
1637
1638         if (!regdb_key_exists(regdb, key)) {
1639                 err = WERR_BADFILE;
1640                 goto done;
1641         }
1642
1643         tdbkey = talloc_asprintf(mem_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1644         if (tdbkey == NULL) {
1645                 goto done;
1646         }
1647         normalize_dbkey(tdbkey);
1648
1649         if (secdesc == NULL) {
1650                 /* assuming a delete */
1651                 err = ntstatus_to_werror(dbwrap_trans_delete_bystring(regdb,
1652                                                                       tdbkey));
1653                 goto done;
1654         }
1655
1656         err = ntstatus_to_werror(marshall_sec_desc(mem_ctx, secdesc,
1657                                                    &tdbdata.dptr,
1658                                                    &tdbdata.dsize));
1659         W_ERROR_NOT_OK_GOTO_DONE(err);
1660
1661         err = ntstatus_to_werror(dbwrap_trans_store_bystring(regdb, tdbkey,
1662                                                              tdbdata, 0));
1663
1664  done:
1665         TALLOC_FREE(mem_ctx);
1666         return err;
1667 }
1668
1669 bool regdb_subkeys_need_update(struct regsubkey_ctr *subkeys)
1670 {
1671         return (regdb_get_seqnum() != regsubkey_ctr_get_seqnum(subkeys));
1672 }
1673
1674 bool regdb_values_need_update(struct regval_ctr *values)
1675 {
1676         return (regdb_get_seqnum() != values->seqnum);
1677 }
1678
1679 /*
1680  * Table of function pointers for default access
1681  */
1682
1683 struct registry_ops regdb_ops = {
1684         .fetch_subkeys = regdb_fetch_keys,
1685         .fetch_values = regdb_fetch_values,
1686         .store_subkeys = regdb_store_keys,
1687         .store_values = regdb_store_values,
1688         .create_subkey = regdb_create_subkey,
1689         .delete_subkey = regdb_delete_subkey,
1690         .get_secdesc = regdb_get_secdesc,
1691         .set_secdesc = regdb_set_secdesc,
1692         .subkeys_need_update = regdb_subkeys_need_update,
1693         .values_need_update = regdb_values_need_update
1694 };