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 static bool regdb_store_keys_internal(struct db_context *db, const char *key,
  35                                       struct regsubkey_ctr *ctr);
  36
  37 /* List the deepest path into the registry.  All part components will be created.*/
  38
  39 /* If you want to have a part of the path controlled by the tdb and part by
  40    a virtual registry db (e.g. printing), then you have to list the deepest path.
  41    For example,"HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion/Print"
  42    allows the reg_db backend to handle everything up to
  43    "HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion" and then we'll hook
  44    the reg_printing backend onto the last component of the path (see
  45    KEY_PRINTING_2K in include/rpc_reg.h)   --jerry */
  46
  47 static const char *builtin_registry_paths[] = {
  48         KEY_PRINTING_2K,
  49         KEY_PRINTING_PORTS,
  50         KEY_PRINTING,
  51         KEY_SHARES,
  52         KEY_EVENTLOG,
  53         KEY_SMBCONF,
  54         KEY_PERFLIB,
  55         KEY_PERFLIB_009,
  56         KEY_GROUP_POLICY,
  57         KEY_SAMBA_GROUP_POLICY,
  58         KEY_GP_MACHINE_POLICY,
  59         KEY_GP_MACHINE_WIN_POLICY,
  60         KEY_HKCU,
  61         KEY_GP_USER_POLICY,
  62         KEY_GP_USER_WIN_POLICY,
  63         KEY_WINLOGON_GPEXT_PATH,
  64         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Print\\Monitors",
  65         KEY_PROD_OPTIONS,
  66         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Terminal Server\\DefaultUserConfiguration",
  67         KEY_TCPIP_PARAMS,
  68         KEY_NETLOGON_PARAMS,
  69         KEY_HKU,
  70         KEY_HKCR,
  71         KEY_HKPD,
  72         KEY_HKPT,
  73          NULL };
  74
  75 struct builtin_regkey_value {
  76         const char *path;
  77         const char *valuename;
  78         uint32 type;
  79         union {
  80                 const char *string;
  81                 uint32 dw_value;
  82         } data;
  83 };
  84
  85 static struct builtin_regkey_value builtin_registry_values[] = {
  86         { KEY_PRINTING_PORTS,
  87                 SAMBA_PRINTER_PORT_NAME, REG_SZ, { "" } },
  88         { KEY_PRINTING_2K,
  89                 "DefaultSpoolDirectory", REG_SZ, { "C:\\Windows\\System32\\Spool\\Printers" } },
  90         { KEY_EVENTLOG,
  91                 "DisplayName", REG_SZ, { "Event Log" } },
  92         { KEY_EVENTLOG,
  93                 "ErrorControl", REG_DWORD, { (char*)0x00000001 } },
  94         { NULL, NULL, 0, { NULL } }
  95 };
  96
  97 /**
  98  * Initialize a key in the registry:
  99  * create each component key of the specified path.
 100  */
 101 static WERROR init_registry_key_internal(struct db_context *db,
 102                                          const char *add_path)
 103 {
 104         WERROR werr;
 105         TALLOC_CTX *frame = talloc_stackframe();
 106         char *path = NULL;
 107         char *base = NULL;
 108         char *remaining = NULL;
 109         char *keyname;
 110         char *subkeyname;
 111         struct regsubkey_ctr *subkeys;
 112         const char *p, *p2;
 113
 114         DEBUG(6, ("init_registry_key: Adding [%s]\n", add_path));
 115
 116         path = talloc_strdup(frame, add_path);
 117         base = talloc_strdup(frame, "");
 118         if (!path || !base) {
 119                 werr = WERR_NOMEM;
 120                 goto fail;
 121         }
 122         p = path;
 123
 124         while (next_token_talloc(frame, &p, &keyname, "\\")) {
 125
 126                 /* build up the registry path from the components */
 127
 128                 if (*base) {
 129                         base = talloc_asprintf(frame, "%s\\", base);
 130                         if (!base) {
 131                                 werr = WERR_NOMEM;
 132                                 goto fail;
 133                         }
 134                 }
 135                 base = talloc_asprintf_append(base, "%s", keyname);
 136                 if (!base) {
 137                         werr = WERR_NOMEM;
 138                         goto fail;
 139                 }
 140
 141                 /* get the immediate subkeyname (if we have one ) */
 142
 143                 subkeyname = talloc_strdup(frame, "");
 144                 if (!subkeyname) {
 145                         werr = WERR_NOMEM;
 146                         goto fail;
 147                 }
 148                 if (*p) {
 149                         remaining = talloc_strdup(frame, p);
 150                         if (!remaining) {
 151                                 werr = WERR_NOMEM;
 152                                 goto fail;
 153                         }
 154                         p2 = remaining;
 155
 156                         if (!next_token_talloc(frame, &p2,
 157                                                 &subkeyname, "\\"))
 158                         {
 159                                 subkeyname = talloc_strdup(frame,p2);
 160                                 if (!subkeyname) {
 161                                         werr = WERR_NOMEM;
 162                                         goto fail;
 163                                 }
 164                         }
 165                 }
 166
 167                 DEBUG(10,("init_registry_key: Storing key [%s] with "
 168                           "subkey [%s]\n", base,
 169                           *subkeyname ? subkeyname : "NULL"));
 170
 171                 /* we don't really care if the lookup succeeds or not
 172                  * since we are about to update the record.
 173                  * We just want any subkeys already present */
 174
 175                 werr = regsubkey_ctr_init(frame, &subkeys);
 176                 if (!W_ERROR_IS_OK(werr)) {
 177                         DEBUG(0,("talloc() failure!\n"));
 178                         goto fail;
 179                 }
 180
 181                 regdb_fetch_keys_internal(db, base, subkeys);
 182                 if (*subkeyname) {
 183                         werr = regsubkey_ctr_addkey(subkeys, subkeyname);
 184                         if (!W_ERROR_IS_OK(werr)) {
 185                                 goto fail;
 186                         }
 187                 }
 188                 if (!regdb_store_keys_internal(db, base, subkeys)) {
 189                         werr = WERR_CAN_NOT_COMPLETE;
 190                         goto fail;
 191                 }
 192         }
 193
 194         werr = WERR_OK;
 195
 196 fail:
 197         TALLOC_FREE(frame);
 198         return werr;
 199 }
 200
 201 /**
 202  * Initialize a key in the registry:
 203  * create each component key of the specified path,
 204  * wrapped in one db transaction.
 205  */
 206 WERROR init_registry_key(const char *add_path)
 207 {
 208         WERROR werr;
 209
 210         if (regdb_key_exists(regdb, add_path)) {
 211                 return WERR_OK;
 212         }
 213
 214         if (regdb->transaction_start(regdb) != 0) {
 215                 DEBUG(0, ("init_registry_key: transaction_start failed\n"));
 216                 return WERR_REG_IO_FAILURE;
 217         }
 218
 219         werr = init_registry_key_internal(regdb, add_path);
 220         if (!W_ERROR_IS_OK(werr)) {
 221                 goto fail;
 222         }
 223
 224         if (regdb->transaction_commit(regdb) != 0) {
 225                 DEBUG(0, ("init_registry_key: Could not commit transaction\n"));
 226                 return WERR_REG_IO_FAILURE;
 227         }
 228
 229         return WERR_OK;
 230
 231 fail:
 232         if (regdb->transaction_cancel(regdb) != 0) {
 233                 smb_panic("init_registry_key: transaction_cancel failed\n");
 234         }
 235
 236         return werr;
 237 }
 238
 239 /***********************************************************************
 240  Open the registry data in the tdb
 241  ***********************************************************************/
 242
 243 WERROR init_registry_data(void)
 244 {
 245         WERROR werr;
 246         TALLOC_CTX *frame = talloc_stackframe();
 247         struct regval_ctr *values;
 248         int i;
 249         UNISTR2 data;
 250
 251         /*
 252          * First, check for the existence of the needed keys and values.
 253          * If all do already exist, we can save the writes.
 254          */
 255         for (i=0; builtin_registry_paths[i] != NULL; i++) {
 256                 if (!regdb_key_exists(regdb, builtin_registry_paths[i])) {
 257                         goto do_init;
 258                 }
 259         }
 260
 261         for (i=0; builtin_registry_values[i].path != NULL; i++) {
 262                 values = TALLOC_ZERO_P(frame, struct regval_ctr);
 263                 if (values == NULL) {
 264                         werr = WERR_NOMEM;
 265                         goto done;
 266                 }
 267
 268                 regdb_fetch_values(builtin_registry_values[i].path, values);
 269                 if (!regval_ctr_key_exists(values,
 270                                         builtin_registry_values[i].valuename))
 271                 {
 272                         TALLOC_FREE(values);
 273                         goto do_init;
 274                 }
 275
 276                 TALLOC_FREE(values);
 277         }
 278
 279         werr = WERR_OK;
 280         goto done;
 281
 282 do_init:
 283
 284         /*
 285          * There are potentially quite a few store operations which are all
 286          * indiviually wrapped in tdb transactions. Wrapping them in a single
 287          * transaction gives just a single transaction_commit() to actually do
 288          * its fsync()s. See tdb/common/transaction.c for info about nested
 289          * transaction behaviour.
 290          */
 291
 292         if (regdb->transaction_start(regdb) != 0) {
 293                 DEBUG(0, ("init_registry_data: tdb_transaction_start "
 294                           "failed\n"));
 295                 werr = WERR_REG_IO_FAILURE;
 296                 goto done;
 297         }
 298
 299         /* loop over all of the predefined paths and add each component */
 300
 301         for (i=0; builtin_registry_paths[i] != NULL; i++) {
 302                 if (regdb_key_exists(regdb, builtin_registry_paths[i])) {
 303                         continue;
 304                 }
 305                 werr = init_registry_key_internal(regdb,
 306                                                   builtin_registry_paths[i]);
 307                 if (!W_ERROR_IS_OK(werr)) {
 308                         goto fail;
 309                 }
 310         }
 311
 312         /* loop over all of the predefined values and add each component */
 313
 314         for (i=0; builtin_registry_values[i].path != NULL; i++) {
 315
 316                 values = TALLOC_ZERO_P(frame, struct regval_ctr);
 317                 if (values == NULL) {
 318                         werr = WERR_NOMEM;
 319                         goto fail;
 320                 }
 321
 322                 regdb_fetch_values(builtin_registry_values[i].path, values);
 323
 324                 /* preserve existing values across restarts. Only add new ones */
 325
 326                 if (!regval_ctr_key_exists(values,
 327                                         builtin_registry_values[i].valuename))
 328                 {
 329                         switch(builtin_registry_values[i].type) {
 330                         case REG_DWORD:
 331                                 regval_ctr_addvalue(values,
 332                                         builtin_registry_values[i].valuename,
 333                                         REG_DWORD,
 334                                         (char*)&builtin_registry_values[i].data.dw_value,
 335                                         sizeof(uint32));
 336                                 break;
 337
 338                         case REG_SZ:
 339                                 init_unistr2(&data,
 340                                         builtin_registry_values[i].data.string,
 341                                         UNI_STR_TERMINATE);
 342                                 regval_ctr_addvalue(values,
 343                                         builtin_registry_values[i].valuename,
 344                                         REG_SZ,
 345                                         (char*)data.buffer,
 346                                         data.uni_str_len*sizeof(uint16));
 347                                 break;
 348
 349                         default:
 350                                 DEBUG(0, ("init_registry_data: invalid value "
 351                                           "type in builtin_registry_values "
 352                                           "[%d]\n",
 353                                           builtin_registry_values[i].type));
 354                         }
 355                         regdb_store_values(builtin_registry_values[i].path,
 356                                            values);
 357                 }
 358                 TALLOC_FREE(values);
 359         }
 360
 361         if (regdb->transaction_commit(regdb) != 0) {
 362                 DEBUG(0, ("init_registry_data: Could not commit "
 363                           "transaction\n"));
 364                 werr = WERR_REG_IO_FAILURE;
 365         } else {
 366                 werr = WERR_OK;
 367         }
 368
 369         goto done;
 370
 371 fail:
 372         if (regdb->transaction_cancel(regdb) != 0) {
 373                 smb_panic("init_registry_data: tdb_transaction_cancel "
 374                           "failed\n");
 375         }
 376
 377 done:
 378         TALLOC_FREE(frame);
 379         return werr;
 380 }
 381
 382 /***********************************************************************
 383  Open the registry database
 384  ***********************************************************************/
 385
 386 WERROR regdb_init(void)
 387 {
 388         const char *vstring = "INFO/version";
 389         uint32 vers_id;
 390         WERROR werr;
 391
 392         if (regdb) {
 393                 DEBUG(10, ("regdb_init: incrementing refcount (%d)\n",
 394                           regdb_refcount));
 395                 regdb_refcount++;
 396                 return WERR_OK;
 397         }
 398
 399         regdb = db_open(NULL, state_path("registry.tdb"), 0,
 400                               REG_TDB_FLAGS, O_RDWR, 0600);
 401         if (!regdb) {
 402                 regdb = db_open(NULL, state_path("registry.tdb"), 0,
 403                                       REG_TDB_FLAGS, O_RDWR|O_CREAT, 0600);
 404                 if (!regdb) {
 405                         werr = ntstatus_to_werror(map_nt_error_from_unix(errno));
 406                         DEBUG(1,("regdb_init: Failed to open registry %s (%s)\n",
 407                                 state_path("registry.tdb"), strerror(errno) ));
 408                         return werr;
 409                 }
 410
 411                 DEBUG(10,("regdb_init: Successfully created registry tdb\n"));
 412         }
 413
 414         regdb_refcount = 1;
 415
 416         vers_id = dbwrap_fetch_int32(regdb, vstring);
 417
 418         if ( vers_id != REGVER_V1 ) {
 419                 NTSTATUS status;
 420                 /* any upgrade code here if needed */
 421                 DEBUG(10, ("regdb_init: got %s = %d != %d\n", vstring,
 422                            vers_id, REGVER_V1));
 423                 status = dbwrap_trans_store_int32(regdb, vstring, REGVER_V1);
 424                 if (!NT_STATUS_IS_OK(status)) {
 425                         DEBUG(1, ("regdb_init: error storing %s = %d: %s\n",
 426                                   vstring, REGVER_V1, nt_errstr(status)));
 427                         return ntstatus_to_werror(status);
 428                 } else {
 429                         DEBUG(10, ("regdb_init: stored %s = %d\n",
 430                                   vstring, REGVER_V1));
 431                 }
 432         }
 433
 434         return WERR_OK;
 435 }
 436
 437 /***********************************************************************
 438  Open the registry.  Must already have been initialized by regdb_init()
 439  ***********************************************************************/
 440
 441 WERROR regdb_open( void )
 442 {
 443         WERROR result = WERR_OK;
 444
 445         if ( regdb ) {
 446                 DEBUG(10,("regdb_open: incrementing refcount (%d)\n", regdb_refcount));
 447                 regdb_refcount++;
 448                 return WERR_OK;
 449         }
 450
 451         become_root();
 452
 453         regdb = db_open(NULL, state_path("registry.tdb"), 0,
 454                               REG_TDB_FLAGS, O_RDWR, 0600);
 455         if ( !regdb ) {
 456                 result = ntstatus_to_werror( map_nt_error_from_unix( errno ) );
 457                 DEBUG(0,("regdb_open: Failed to open %s! (%s)\n",
 458                         state_path("registry.tdb"), strerror(errno) ));
 459         }
 460
 461         unbecome_root();
 462
 463         regdb_refcount = 1;
 464         DEBUG(10,("regdb_open: refcount reset (%d)\n", regdb_refcount));
 465
 466         return result;
 467 }
 468
 469 /***********************************************************************
 470  ***********************************************************************/
 471
 472 int regdb_close( void )
 473 {
 474         if (regdb_refcount == 0) {
 475                 return 0;
 476         }
 477
 478         regdb_refcount--;
 479
 480         DEBUG(10,("regdb_close: decrementing refcount (%d)\n", regdb_refcount));
 481
 482         if ( regdb_refcount > 0 )
 483                 return 0;
 484
 485         SMB_ASSERT( regdb_refcount >= 0 );
 486
 487         TALLOC_FREE(regdb);
 488         return 0;
 489 }
 490
 491 WERROR regdb_transaction_start(void)
 492 {
 493         return (regdb->transaction_start(regdb) == 0) ?
 494                 WERR_OK : WERR_REG_IO_FAILURE;
 495 }
 496
 497 WERROR regdb_transaction_commit(void)
 498 {
 499         return (regdb->transaction_commit(regdb) == 0) ?
 500                 WERR_OK : WERR_REG_IO_FAILURE;
 501 }
 502
 503 WERROR regdb_transaction_cancel(void)
 504 {
 505         return (regdb->transaction_cancel(regdb) == 0) ?
 506                 WERR_OK : WERR_REG_IO_FAILURE;
 507 }
 508
 509 /***********************************************************************
 510  return the tdb sequence number of the registry tdb.
 511  this is an indicator for the content of the registry
 512  having changed. it will change upon regdb_init, too, though.
 513  ***********************************************************************/
 514 int regdb_get_seqnum(void)
 515 {
 516         return regdb->get_seqnum(regdb);
 517 }
 518
 519
 520 static WERROR regdb_delete_key_with_prefix(struct db_context *db,
 521                                            const char *keyname,
 522                                            const char *prefix)
 523 {
 524         char *path;
 525         WERROR werr = WERR_NOMEM;
 526         TALLOC_CTX *mem_ctx = talloc_stackframe();
 527
 528         if (keyname == NULL) {
 529                 werr = WERR_INVALID_PARAM;
 530                 goto done;
 531         }
 532
 533         if (prefix == NULL) {
 534                 path = discard_const_p(char, keyname);
 535         } else {
 536                 path = talloc_asprintf(mem_ctx, "%s/%s", prefix, keyname);
 537                 if (path == NULL) {
 538                         goto done;
 539                 }
 540         }
 541
 542         path = normalize_reg_path(mem_ctx, path);
 543         if (path == NULL) {
 544                 goto done;
 545         }
 546
 547         werr = ntstatus_to_werror(dbwrap_delete_bystring(db, path));
 548
 549         /* treat "not" found" as ok */
 550         if (W_ERROR_EQUAL(werr, WERR_NOT_FOUND)) {
 551                 werr = WERR_OK;
 552         }
 553
 554 done:
 555         talloc_free(mem_ctx);
 556         return werr;
 557 }
 558
 559
 560 static WERROR regdb_delete_values(struct db_context *db, const char *keyname)
 561 {
 562         return regdb_delete_key_with_prefix(db, keyname, REG_VALUE_PREFIX);
 563 }
 564
 565 static WERROR regdb_delete_secdesc(struct db_context *db, const char *keyname)
 566 {
 567         return regdb_delete_key_with_prefix(db, keyname, REG_SECDESC_PREFIX);
 568 }
 569
 570 static WERROR regdb_delete_subkeylist(struct db_context *db, const char *keyname)
 571 {
 572         return regdb_delete_key_with_prefix(db, keyname, NULL);
 573 }
 574
 575 static WERROR regdb_delete_key_lists(struct db_context *db, const char *keyname)
 576 {
 577         WERROR werr;
 578
 579         werr = regdb_delete_values(db, keyname);
 580         if (!W_ERROR_IS_OK(werr)) {
 581                 DEBUG(1, (__location__ " Deleting %s/%s failed: %s\n",
 582                           REG_VALUE_PREFIX, keyname, win_errstr(werr)));
 583                 goto done;
 584         }
 585
 586         werr = regdb_delete_secdesc(db, keyname);
 587         if (!W_ERROR_IS_OK(werr)) {
 588                 DEBUG(1, (__location__ " Deleting %s/%s failed: %s\n",
 589                           REG_SECDESC_PREFIX, keyname, win_errstr(werr)));
 590                 goto done;
 591         }
 592
 593         werr = regdb_delete_subkeylist(db, keyname);
 594         if (!W_ERROR_IS_OK(werr)) {
 595                 DEBUG(1, (__location__ " Deleting %s failed: %s\n",
 596                           keyname, win_errstr(werr)));
 597                 goto done;
 598         }
 599
 600 done:
 601         return werr;
 602 }
 603
 604 /***********************************************************************
 605  Add subkey strings to the registry tdb under a defined key
 606  fmt is the same format as tdb_pack except this function only supports
 607  fstrings
 608  ***********************************************************************/
 609
 610 static bool regdb_store_keys_internal2(struct db_context *db,
 611                                        const char *key,
 612                                        struct regsubkey_ctr *ctr)
 613 {
 614         TDB_DATA dbuf;
 615         uint8 *buffer = NULL;
 616         int i = 0;
 617         uint32 len, buflen;
 618         bool ret = true;
 619         uint32 num_subkeys = regsubkey_ctr_numkeys(ctr);
 620         char *keyname = NULL;
 621         TALLOC_CTX *ctx = talloc_stackframe();
 622         NTSTATUS status;
 623
 624         if (!key) {
 625                 return false;
 626         }
 627
 628         keyname = talloc_strdup(ctx, key);
 629         if (!keyname) {
 630                 return false;
 631         }
 632         keyname = normalize_reg_path(ctx, keyname);
 633
 634         /* allocate some initial memory */
 635
 636         buffer = (uint8 *)SMB_MALLOC(1024);
 637         if (buffer == NULL) {
 638                 return false;
 639         }
 640         buflen = 1024;
 641         len = 0;
 642
 643         /* store the number of subkeys */
 644
 645         len += tdb_pack(buffer+len, buflen-len, "d", num_subkeys);
 646
 647         /* pack all the strings */
 648
 649         for (i=0; i<num_subkeys; i++) {
 650                 size_t thistime;
 651
 652                 thistime = tdb_pack(buffer+len, buflen-len, "f",
 653                                     regsubkey_ctr_specific_key(ctr, i));
 654                 if (len+thistime > buflen) {
 655                         size_t thistime2;
 656                         /*
 657                          * tdb_pack hasn't done anything because of the short
 658                          * buffer, allocate extra space.
 659                          */
 660                         buffer = SMB_REALLOC_ARRAY(buffer, uint8_t,
 661                                                    (len+thistime)*2);
 662                         if(buffer == NULL) {
 663                                 DEBUG(0, ("regdb_store_keys: Failed to realloc "
 664                                           "memory of size [%u]\n",
 665                                           (unsigned int)(len+thistime)*2));
 666                                 ret = false;
 667                                 goto done;
 668                         }
 669                         buflen = (len+thistime)*2;
 670                         thistime2 = tdb_pack(
 671                                 buffer+len, buflen-len, "f",
 672                                 regsubkey_ctr_specific_key(ctr, i));
 673                         if (thistime2 != thistime) {
 674                                 DEBUG(0, ("tdb_pack failed\n"));
 675                                 ret = false;
 676                                 goto done;
 677                         }
 678                 }
 679                 len += thistime;
 680         }
 681
 682         /* finally write out the data */
 683
 684         dbuf.dptr = buffer;
 685         dbuf.dsize = len;
 686         status = dbwrap_store_bystring(db, keyname, dbuf, TDB_REPLACE);
 687         if (!NT_STATUS_IS_OK(status)) {
 688                 ret = false;
 689                 goto done;
 690         }
 691
 692         /*
 693          * Delete a sorted subkey cache for regdb_key_exists, will be
 694          * recreated automatically
 695          */
 696         keyname = talloc_asprintf(ctx, "%s/%s", REG_SORTED_SUBKEYS_PREFIX,
 697                                   keyname);
 698         if (keyname != NULL) {
 699                 dbwrap_delete_bystring(db, keyname);
 700         }
 701
 702 done:
 703         TALLOC_FREE(ctx);
 704         SAFE_FREE(buffer);
 705         return ret;
 706 }
 707
 708 /***********************************************************************
 709  Store the new subkey record and create any child key records that
 710  do not currently exist
 711  ***********************************************************************/
 712
 713 static bool regdb_store_keys_internal(struct db_context *db, const char *key,
 714                                       struct regsubkey_ctr *ctr)
 715 {
 716         int num_subkeys, old_num_subkeys, i;
 717         char *path = NULL;
 718         struct regsubkey_ctr *subkeys = NULL, *old_subkeys = NULL;
 719         char *oldkeyname = NULL;
 720         TALLOC_CTX *ctx = talloc_stackframe();
 721         WERROR werr;
 722
 723         if (!regdb_key_is_base_key(key) && !regdb_key_exists(db, key)) {
 724                 goto fail;
 725         }
 726
 727         /*
 728          * fetch a list of the old subkeys so we can determine if anything has
 729          * changed
 730          */
 731
 732         werr = regsubkey_ctr_init(ctx, &old_subkeys);
 733         if (!W_ERROR_IS_OK(werr)) {
 734                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 735                 return false;
 736         }
 737
 738         regdb_fetch_keys_internal(db, key, old_subkeys);
 739
 740         num_subkeys = regsubkey_ctr_numkeys(ctr);
 741         old_num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
 742         if ((num_subkeys && old_num_subkeys) &&
 743             (num_subkeys == old_num_subkeys)) {
 744
 745                 for (i = 0; i < num_subkeys; i++) {
 746                         if (strcmp(regsubkey_ctr_specific_key(ctr, i),
 747                                    regsubkey_ctr_specific_key(old_subkeys, i))
 748                             != 0)
 749                         {
 750                                 break;
 751                         }
 752                 }
 753                 if (i == num_subkeys) {
 754                         /*
 755                          * Nothing changed, no point to even start a tdb
 756                          * transaction
 757                          */
 758                         TALLOC_FREE(old_subkeys);
 759                         return true;
 760                 }
 761         }
 762
 763         TALLOC_FREE(old_subkeys);
 764
 765         if (db->transaction_start(db) != 0) {
 766                 DEBUG(0, ("regdb_store_keys: transaction_start failed\n"));
 767                 goto fail;
 768         }
 769
 770         /*
 771          * Re-fetch the old keys inside the transaction
 772          */
 773
 774         werr = regsubkey_ctr_init(ctx, &old_subkeys);
 775         if (!W_ERROR_IS_OK(werr)) {
 776                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 777                 goto cancel;
 778         }
 779
 780         regdb_fetch_keys_internal(db, key, old_subkeys);
 781
 782         /*
 783          * Make the store operation as safe as possible without transactions:
 784          *
 785          * (1) For each subkey removed from ctr compared with old_subkeys:
 786          *
 787          *     (a) First delete the value db entry.
 788          *
 789          *     (b) Next delete the secdesc db record.
 790          *
 791          *     (c) Then delete the subkey list entry.
 792          *
 793          * (2) Now write the list of subkeys of the parent key,
 794          *     deleting removed entries and adding new ones.
 795          *
 796          * (3) Finally create the subkey list entries for the added keys.
 797          *
 798          * This way if we crash half-way in between deleting the subkeys
 799          * and storing the parent's list of subkeys, no old data can pop up
 800          * out of the blue when re-adding keys later on.
 801          */
 802
 803         /* (1) delete removed keys' lists (values/secdesc/subkeys) */
 804
 805         num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
 806         for (i=0; i<num_subkeys; i++) {
 807                 oldkeyname = regsubkey_ctr_specific_key(old_subkeys, i);
 808
 809                 if (regsubkey_ctr_key_exists(ctr, oldkeyname)) {
 810                         /*
 811                          * It's still around, don't delete
 812                          */
 813
 814                         continue;
 815                 }
 816
 817                 path = talloc_asprintf(ctx, "%s/%s", key, oldkeyname);
 818                 if (!path) {
 819                         goto cancel;
 820                 }
 821
 822                 werr = regdb_delete_key_lists(db, path);
 823                 W_ERROR_NOT_OK_GOTO(werr, cancel);
 824
 825                 TALLOC_FREE(path);
 826         }
 827
 828         TALLOC_FREE(old_subkeys);
 829
 830         /* (2) store the subkey list for the parent */
 831
 832         if (!regdb_store_keys_internal2(db, key, ctr)) {
 833                 DEBUG(0,("regdb_store_keys: Failed to store new subkey list "
 834                          "for parent [%s]\n", key));
 835                 goto cancel;
 836         }
 837
 838         /* (3) now create records for any subkeys that don't already exist */
 839
 840         num_subkeys = regsubkey_ctr_numkeys(ctr);
 841
 842         if (num_subkeys == 0) {
 843                 werr = regsubkey_ctr_init(ctx, &subkeys);
 844                 if (!W_ERROR_IS_OK(werr)) {
 845                         DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 846                         goto cancel;
 847                 }
 848
 849                 if (!regdb_store_keys_internal2(db, key, subkeys)) {
 850                         DEBUG(0,("regdb_store_keys: Failed to store "
 851                                  "new record for key [%s]\n", key));
 852                         goto cancel;
 853                 }
 854                 TALLOC_FREE(subkeys);
 855
 856         }
 857
 858         for (i=0; i<num_subkeys; i++) {
 859                 path = talloc_asprintf(ctx, "%s/%s",
 860                                         key,
 861                                         regsubkey_ctr_specific_key(ctr, i));
 862                 if (!path) {
 863                         goto cancel;
 864                 }
 865                 werr = regsubkey_ctr_init(ctx, &subkeys);
 866                 if (!W_ERROR_IS_OK(werr)) {
 867                         DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 868                         goto cancel;
 869                 }
 870
 871                 if (regdb_fetch_keys_internal(db, path, subkeys) == -1) {
 872                         /* create a record with 0 subkeys */
 873                         if (!regdb_store_keys_internal2(db, path, subkeys)) {
 874                                 DEBUG(0,("regdb_store_keys: Failed to store "
 875                                          "new record for key [%s]\n", path));
 876                                 goto cancel;
 877                         }
 878                 }
 879
 880                 TALLOC_FREE(subkeys);
 881                 TALLOC_FREE(path);
 882         }
 883
 884         if (db->transaction_commit(db) != 0) {
 885                 DEBUG(0, ("regdb_store_keys: Could not commit transaction\n"));
 886                 goto fail;
 887         }
 888
 889         TALLOC_FREE(ctx);
 890         return true;
 891
 892 cancel:
 893         if (db->transaction_cancel(db) != 0) {
 894                 smb_panic("regdb_store_keys: transaction_cancel failed\n");
 895         }
 896
 897 fail:
 898         TALLOC_FREE(ctx);
 899
 900         return false;
 901 }
 902
 903 bool regdb_store_keys(const char *key, struct regsubkey_ctr *ctr)
 904 {
 905         return regdb_store_keys_internal(regdb, key, ctr);
 906 }
 907
 908 static WERROR regdb_create_subkey(const char *key, const char *subkey)
 909 {
 910         WERROR werr;
 911         struct regsubkey_ctr *subkeys;
 912         TALLOC_CTX *mem_ctx = talloc_stackframe();
 913
 914         if (!regdb_key_is_base_key(key) && !regdb_key_exists(regdb, key)) {
 915                 werr = WERR_NOT_FOUND;
 916                 goto done;
 917         }
 918
 919         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
 920         W_ERROR_NOT_OK_GOTO_DONE(werr);
 921
 922         if (regdb_fetch_keys_internal(regdb, key, subkeys) < 0) {
 923                 werr = WERR_REG_IO_FAILURE;
 924                 goto done;
 925         }
 926
 927         if (regsubkey_ctr_key_exists(subkeys, subkey)) {
 928                 werr = WERR_OK;
 929                 goto done;
 930         }
 931
 932         talloc_free(subkeys);
 933
 934         if (regdb->transaction_start(regdb) != 0) {
 935                 werr = WERR_REG_IO_FAILURE;
 936                 goto done;
 937         }
 938
 939         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
 940         W_ERROR_NOT_OK_GOTO(werr, cancel);
 941
 942         if (regdb_fetch_keys_internal(regdb, key, subkeys) < 0) {
 943                 werr = WERR_REG_IO_FAILURE;
 944                 goto cancel;
 945         }
 946
 947         werr = regsubkey_ctr_addkey(subkeys, subkey);
 948         W_ERROR_NOT_OK_GOTO(werr, cancel);
 949
 950         if (!regdb_store_keys_internal2(regdb, key, subkeys)) {
 951                 DEBUG(0, (__location__ " failed to store new subkey list for "
 952                          "parent key %s\n", key));
 953                 werr = WERR_REG_IO_FAILURE;
 954                 goto cancel;
 955         }
 956
 957         if (regdb->transaction_commit(regdb) != 0) {
 958                 werr = WERR_REG_IO_FAILURE;
 959                 DEBUG(0, (__location__ " failed to commit transaction\n"));
 960         }
 961
 962         goto done;
 963
 964 cancel:
 965         if (regdb->transaction_cancel(regdb) != 0) {
 966                 smb_panic("regdb_create_subkey: transaction_cancel failed\n");
 967         }
 968
 969 done:
 970         talloc_free(mem_ctx);
 971         return werr;
 972 }
 973
 974 static WERROR regdb_delete_subkey(const char *key, const char *subkey)
 975 {
 976         WERROR werr;
 977         struct regsubkey_ctr *subkeys;
 978         char *path;
 979         TALLOC_CTX *mem_ctx = talloc_stackframe();
 980
 981         if (!regdb_key_is_base_key(key) && !regdb_key_exists(regdb, key)) {
 982                 werr = WERR_NOT_FOUND;
 983                 goto done;
 984         }
 985
 986         path = talloc_asprintf(mem_ctx, "%s/%s", key, subkey);
 987         if (path == NULL) {
 988                 werr = WERR_NOMEM;
 989                 goto done;
 990         }
 991
 992         if (!regdb_key_exists(regdb, path)) {
 993                 werr = WERR_OK;
 994                 goto done;
 995         }
 996
 997         if (regdb->transaction_start(regdb) != 0) {
 998                 werr = WERR_REG_IO_FAILURE;
 999                 goto done;
1000         }
1001
1002         werr = regdb_delete_key_lists(regdb, path);
1003         W_ERROR_NOT_OK_GOTO(werr, cancel);
1004
1005         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
1006         W_ERROR_NOT_OK_GOTO(werr, cancel);
1007
1008         if (regdb_fetch_keys_internal(regdb, key, subkeys) < 0) {
1009                 werr = WERR_REG_IO_FAILURE;
1010                 goto cancel;
1011         }
1012
1013         werr = regsubkey_ctr_delkey(subkeys, subkey);
1014         W_ERROR_NOT_OK_GOTO(werr, cancel);
1015
1016         if (!regdb_store_keys_internal2(regdb, key, subkeys)) {
1017                 DEBUG(0, (__location__ " failed to store new subkey_list for "
1018                          "parent key %s\n", key));
1019                 werr = WERR_REG_IO_FAILURE;
1020                 goto cancel;
1021         }
1022
1023         if (regdb->transaction_commit(regdb) != 0) {
1024                 DEBUG(0, (__location__ " failed to commit transaction\n"));
1025                 werr = WERR_REG_IO_FAILURE;
1026         }
1027
1028         goto done;
1029
1030 cancel:
1031         if (regdb->transaction_cancel(regdb) != 0) {
1032                 smb_panic("regdb_delete_subkey: transaction_cancel failed\n");
1033         }
1034
1035 done:
1036         talloc_free(mem_ctx);
1037         return werr;
1038 }
1039
1040 static TDB_DATA regdb_fetch_key_internal(struct db_context *db,
1041                                          TALLOC_CTX *mem_ctx, const char *key)
1042 {
1043         char *path = NULL;
1044         TDB_DATA data;
1045
1046         path = normalize_reg_path(mem_ctx, key);
1047         if (!path) {
1048                 return make_tdb_data(NULL, 0);
1049         }
1050
1051         data = dbwrap_fetch_bystring(db, mem_ctx, path);
1052
1053         TALLOC_FREE(path);
1054         return data;
1055 }
1056
1057
1058 /**
1059  * check whether a given key name represents a base key,
1060  * i.e one without a subkey separator ('/' or '\').
1061  */
1062 static bool regdb_key_is_base_key(const char *key)
1063 {
1064         TALLOC_CTX *mem_ctx = talloc_stackframe();
1065         bool ret = false;
1066         char *path;
1067
1068         if (key == NULL) {
1069                 goto done;
1070         }
1071
1072         path = normalize_reg_path(mem_ctx, key);
1073         if (path == NULL) {
1074                 DEBUG(0, ("out of memory! (talloc failed)\n"));
1075                 goto done;
1076         }
1077
1078         if (*path == '\0') {
1079                 goto done;
1080         }
1081
1082         ret = (strrchr(path, '/') == NULL);
1083
1084 done:
1085         TALLOC_FREE(mem_ctx);
1086         return ret;
1087 }
1088
1089 /*
1090  * regdb_key_exists() is a very frequent operation. It can be quite
1091  * time-consuming to fully fetch the parent's subkey list, talloc_strdup all
1092  * subkeys and then compare the keyname linearly to all the parent's subkeys.
1093  *
1094  * The following code tries to make this operation as efficient as possible:
1095  * Per registry key we create a list of subkeys that is very efficient to
1096  * search for existence of a subkey. Its format is:
1097  *
1098  * 4 bytes num_subkeys
1099  * 4*num_subkey bytes offset into the string array
1100  * then follows a sorted list of subkeys in uppercase
1101  *
1102  * This record is created by create_sorted_subkeys() on demand if it does not
1103  * exist. scan_parent_subkeys() uses regdb->parse_record to search the sorted
1104  * list, the parsing code and the binary search can be found in
1105  * parent_subkey_scanner. The code uses parse_record() to avoid a memcpy of
1106  * the potentially large subkey record.
1107  *
1108  * The sorted subkey record is deleted in regdb_store_keys_internal2 and
1109  * recreated on demand.
1110  */
1111
1112 static int cmp_keynames(const void *p1, const void *p2)
1113 {
1114         return StrCaseCmp(*((char **)p1), *((char **)p2));
1115 }
1116
1117 static bool create_sorted_subkeys(const char *key, const char *sorted_keyname)
1118 {
1119         char **sorted_subkeys;
1120         struct regsubkey_ctr *ctr;
1121         bool result = false;
1122         NTSTATUS status;
1123         char *buf;
1124         char *p;
1125         int i, res;
1126         size_t len;
1127         int num_subkeys;
1128         WERROR werr;
1129
1130         if (regdb->transaction_start(regdb) != 0) {
1131                 DEBUG(0, ("create_sorted_subkeys: transaction_start "
1132                           "failed\n"));
1133                 return false;
1134         }
1135
1136         werr = regsubkey_ctr_init(talloc_tos(), &ctr);
1137         if (!W_ERROR_IS_OK(werr)) {
1138                 goto fail;
1139         }
1140
1141         res = regdb_fetch_keys_internal(regdb, key, ctr);
1142         if (res == -1) {
1143                 goto fail;
1144         }
1145
1146         num_subkeys = regsubkey_ctr_numkeys(ctr);
1147         sorted_subkeys = talloc_array(ctr, char *, num_subkeys);
1148         if (sorted_subkeys == NULL) {
1149                 goto fail;
1150         }
1151
1152         len = 4 + 4*num_subkeys;
1153
1154         for (i = 0; i < num_subkeys; i++) {
1155                 sorted_subkeys[i] = talloc_strdup_upper(sorted_subkeys,
1156                                         regsubkey_ctr_specific_key(ctr, i));
1157                 if (sorted_subkeys[i] == NULL) {
1158                         goto fail;
1159                 }
1160                 len += strlen(sorted_subkeys[i])+1;
1161         }
1162
1163         qsort(sorted_subkeys, num_subkeys, sizeof(char *), cmp_keynames);
1164
1165         buf = talloc_array(ctr, char, len);
1166         if (buf == NULL) {
1167                 goto fail;
1168         }
1169         p = buf + 4 + 4*num_subkeys;
1170
1171         SIVAL(buf, 0, num_subkeys);
1172
1173         for (i=0; i < num_subkeys; i++) {
1174                 ptrdiff_t offset = p - buf;
1175                 SIVAL(buf, 4 + 4*i, offset);
1176                 strlcpy(p, sorted_subkeys[i], len-offset);
1177                 p += strlen(sorted_subkeys[i]) + 1;
1178         }
1179
1180         status = dbwrap_store_bystring(
1181                 regdb, sorted_keyname, make_tdb_data((uint8_t *)buf, len),
1182                 TDB_REPLACE);
1183         if (!NT_STATUS_IS_OK(status)) {
1184                 /*
1185                  * Don't use a "goto fail;" here, this would commit the broken
1186                  * transaction. See below for an explanation.
1187                  */
1188                 if (regdb->transaction_cancel(regdb) == -1) {
1189                         smb_panic("create_sorted_subkeys: transaction_cancel "
1190                                   "failed\n");
1191                 }
1192                 TALLOC_FREE(ctr);
1193                 return false;
1194         }
1195
1196         result = true;
1197  fail:
1198         /*
1199          * We only get here via the "goto fail" when we did not write anything
1200          * yet. Using transaction_commit even in a failure case is necessary
1201          * because this (disposable) call might be nested in other
1202          * transactions. Doing a cancel here would destroy the possibility of
1203          * a transaction_commit for transactions that we might be wrapped in.
1204          */
1205         if (regdb->transaction_commit(regdb) == -1) {
1206                 DEBUG(0, ("create_sorted_subkeys: transaction_commit "
1207                           "failed\n"));
1208                 result = false;
1209         }
1210
1211         TALLOC_FREE(ctr);
1212         return result;
1213 }
1214
1215 struct scan_subkey_state {
1216         char *name;
1217         bool scanned;
1218         bool found;
1219 };
1220
1221 static int parent_subkey_scanner(TDB_DATA key, TDB_DATA data,
1222                                  void *private_data)
1223 {
1224         struct scan_subkey_state *state =
1225                 (struct scan_subkey_state *)private_data;
1226         uint32_t num_subkeys;
1227         uint32_t l, u;
1228
1229         if (data.dsize < sizeof(uint32_t)) {
1230                 return -1;
1231         }
1232
1233         state->scanned = true;
1234         state->found = false;
1235
1236         tdb_unpack(data.dptr, data.dsize, "d", &num_subkeys);
1237
1238         l = 0;
1239         u = num_subkeys;
1240
1241         while (l < u) {
1242                 uint32_t idx = (l+u)/2;
1243                 char *s = (char *)data.dptr + IVAL(data.dptr, 4 + 4*idx);
1244                 int comparison = strcmp(state->name, s);
1245
1246                 if (comparison < 0) {
1247                         u = idx;
1248                 } else if (comparison > 0) {
1249                         l = idx + 1;
1250                 } else {
1251                         state->found = true;
1252                         return 0;
1253                 }
1254         }
1255         return 0;
1256 }
1257
1258 static bool scan_parent_subkeys(struct db_context *db, const char *parent,
1259                                 const char *name)
1260 {
1261         char *path = NULL;
1262         char *key = NULL;
1263         struct scan_subkey_state state = { 0, };
1264         bool result = false;
1265         int res;
1266
1267         state.name = NULL;
1268
1269         path = normalize_reg_path(talloc_tos(), parent);
1270         if (path == NULL) {
1271                 goto fail;
1272         }
1273
1274         key = talloc_asprintf(talloc_tos(), "%s/%s",
1275                               REG_SORTED_SUBKEYS_PREFIX, path);
1276         if (key == NULL) {
1277                 goto fail;
1278         }
1279
1280         state.name = talloc_strdup_upper(talloc_tos(), name);
1281         if (state.name == NULL) {
1282                 goto fail;
1283         }
1284         state.scanned = false;
1285
1286         res = db->parse_record(db, string_term_tdb_data(key),
1287                                parent_subkey_scanner, &state);
1288
1289         if (state.scanned) {
1290                 result = state.found;
1291         } else {
1292                 if (!create_sorted_subkeys(path, key)) {
1293                         goto fail;
1294                 }
1295                 res = db->parse_record(db, string_term_tdb_data(key),
1296                                        parent_subkey_scanner, &state);
1297                 if ((res == 0) && (state.scanned)) {
1298                         result = state.found;
1299                 }
1300         }
1301
1302  fail:
1303         TALLOC_FREE(path);
1304         TALLOC_FREE(state.name);
1305         return result;
1306 }
1307
1308 /**
1309  * Check for the existence of a key.
1310  *
1311  * Existence of a key is authoritatively defined by its
1312  * existence in the list of subkeys of its parent key.
1313  * The exeption of this are keys without a parent key,
1314  * i.e. the "base" keys (HKLM, HKCU, ...).
1315  */
1316 static bool regdb_key_exists(struct db_context *db, const char *key)
1317 {
1318         TALLOC_CTX *mem_ctx = talloc_stackframe();
1319         TDB_DATA value;
1320         bool ret = false;
1321         char *path, *p;
1322
1323         if (key == NULL) {
1324                 goto done;
1325         }
1326
1327         path = normalize_reg_path(mem_ctx, key);
1328         if (path == NULL) {
1329                 DEBUG(0, ("out of memory! (talloc failed)\n"));
1330                 goto done;
1331         }
1332
1333         if (*path == '\0') {
1334                 goto done;
1335         }
1336
1337         p = strrchr(path, '/');
1338         if (p == NULL) {
1339                 /* this is a base key */
1340                 value = regdb_fetch_key_internal(db, mem_ctx, path);
1341                 ret = (value.dptr != NULL);
1342         } else {
1343                 *p = '\0';
1344                 ret = scan_parent_subkeys(db, path, p+1);
1345         }
1346
1347 done:
1348         TALLOC_FREE(mem_ctx);
1349         return ret;
1350 }
1351
1352
1353 /***********************************************************************
1354  Retrieve an array of strings containing subkeys.  Memory should be
1355  released by the caller.
1356  ***********************************************************************/
1357
1358 static int regdb_fetch_keys_internal(struct db_context *db, const char *key,
1359                                      struct regsubkey_ctr *ctr)
1360 {
1361         WERROR werr;
1362         uint32 num_items;
1363         uint8 *buf;
1364         uint32 buflen, len;
1365         int i;
1366         fstring subkeyname;
1367         int ret = -1;
1368         TALLOC_CTX *frame = talloc_stackframe();
1369         TDB_DATA value;
1370
1371         DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL"));
1372
1373         if (!regdb_key_exists(db, key)) {
1374                 goto done;
1375         }
1376
1377         werr = regsubkey_ctr_set_seqnum(ctr, db->get_seqnum(db));
1378         if (!W_ERROR_IS_OK(werr)) {
1379                 goto done;
1380         }
1381
1382         value = regdb_fetch_key_internal(db, frame, key);
1383
1384         if (value.dptr == NULL) {
1385                 DEBUG(10, ("regdb_fetch_keys: no subkeys found for key [%s]\n",
1386                            key));
1387                 ret = 0;
1388                 goto done;
1389         }
1390
1391         buf = value.dptr;
1392         buflen = value.dsize;
1393         len = tdb_unpack( buf, buflen, "d", &num_items);
1394
1395         for (i=0; i<num_items; i++) {
1396                 len += tdb_unpack(buf+len, buflen-len, "f", subkeyname);
1397                 werr = regsubkey_ctr_addkey(ctr, subkeyname);
1398                 if (!W_ERROR_IS_OK(werr)) {
1399                         DEBUG(5, ("regdb_fetch_keys: regsubkey_ctr_addkey "
1400                                   "failed: %s\n", win_errstr(werr)));
1401                         goto done;
1402                 }
1403         }
1404
1405         DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items));
1406
1407         ret = num_items;
1408 done:
1409         TALLOC_FREE(frame);
1410         return ret;
1411 }
1412
1413 int regdb_fetch_keys(const char *key, struct regsubkey_ctr *ctr)
1414 {
1415         return regdb_fetch_keys_internal(regdb, key, ctr);
1416 }
1417
1418 /****************************************************************************
1419  Unpack a list of registry values frem the TDB
1420  ***************************************************************************/
1421
1422 static int regdb_unpack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1423 {
1424         int             len = 0;
1425         uint32          type;
1426         fstring valuename;
1427         uint32          size;
1428         uint8           *data_p;
1429         uint32          num_values = 0;
1430         int             i;
1431
1432         /* loop and unpack the rest of the registry values */
1433
1434         len += tdb_unpack(buf+len, buflen-len, "d", &num_values);
1435
1436         for ( i=0; i<num_values; i++ ) {
1437                 /* unpack the next regval */
1438
1439                 type = REG_NONE;
1440                 size = 0;
1441                 data_p = NULL;
1442                 valuename[0] = '\0';
1443                 len += tdb_unpack(buf+len, buflen-len, "fdB",
1444                                   valuename,
1445                                   &type,
1446                                   &size,
1447                                   &data_p);
1448
1449                 /* add the new value. Paranoid protective code -- make sure data_p is valid */
1450
1451                 if (*valuename && size && data_p) {
1452                         regval_ctr_addvalue(values, valuename, type,
1453                                         (const char *)data_p, size);
1454                 }
1455                 SAFE_FREE(data_p); /* 'B' option to tdb_unpack does a malloc() */
1456
1457                 DEBUG(8,("specific: [%s], len: %d\n", valuename, size));
1458         }
1459
1460         return len;
1461 }
1462
1463 /****************************************************************************
1464  Pack all values in all printer keys
1465  ***************************************************************************/
1466
1467 static int regdb_pack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1468 {
1469         int             len = 0;
1470         int             i;
1471         struct regval_blob      *val;
1472         int             num_values;
1473
1474         if ( !values )
1475                 return 0;
1476
1477         num_values = regval_ctr_numvals( values );
1478
1479         /* pack the number of values first */
1480
1481         len += tdb_pack( buf+len, buflen-len, "d", num_values );
1482
1483         /* loop over all values */
1484
1485         for ( i=0; i<num_values; i++ ) {
1486                 val = regval_ctr_specific_value( values, i );
1487                 len += tdb_pack(buf+len, buflen-len, "fdB",
1488                                 regval_name(val),
1489                                 regval_type(val),
1490                                 regval_size(val),
1491                                 regval_data_p(val) );
1492         }
1493
1494         return len;
1495 }
1496
1497 /***********************************************************************
1498  Retrieve an array of strings containing subkeys.  Memory should be
1499  released by the caller.
1500  ***********************************************************************/
1501
1502 int regdb_fetch_values(const char* key, struct regval_ctr *values)
1503 {
1504         char *keystr = NULL;
1505         TALLOC_CTX *ctx = talloc_stackframe();
1506         int ret = 0;
1507         TDB_DATA value;
1508
1509         DEBUG(10,("regdb_fetch_values: Looking for value of key [%s] \n", key));
1510
1511         if (!regdb_key_exists(regdb, key)) {
1512                 goto done;
1513         }
1514
1515         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key);
1516         if (!keystr) {
1517                 goto done;
1518         }
1519
1520         values->seqnum = regdb_get_seqnum();
1521
1522         value = regdb_fetch_key_internal(regdb, ctx, keystr);
1523
1524         if (!value.dptr) {
1525                 /* all keys have zero values by default */
1526                 goto done;
1527         }
1528
1529         regdb_unpack_values(values, value.dptr, value.dsize);
1530         ret = regval_ctr_numvals(values);
1531
1532 done:
1533         TALLOC_FREE(ctx);
1534         return ret;
1535 }
1536
1537 bool regdb_store_values(const char *key, struct regval_ctr *values)
1538 {
1539         TDB_DATA old_data, data;
1540         char *keystr = NULL;
1541         TALLOC_CTX *ctx = talloc_stackframe();
1542         int len;
1543         NTSTATUS status;
1544         bool result = false;
1545
1546         DEBUG(10,("regdb_store_values: Looking for value of key [%s] \n", key));
1547
1548         if (!regdb_key_exists(regdb, key)) {
1549                 goto done;
1550         }
1551
1552         ZERO_STRUCT(data);
1553
1554         len = regdb_pack_values(values, data.dptr, data.dsize);
1555         if (len <= 0) {
1556                 DEBUG(0,("regdb_store_values: unable to pack values. len <= 0\n"));
1557                 goto done;
1558         }
1559
1560         data.dptr = TALLOC_ARRAY(ctx, uint8, len);
1561         data.dsize = len;
1562
1563         len = regdb_pack_values(values, data.dptr, data.dsize);
1564
1565         SMB_ASSERT( len == data.dsize );
1566
1567         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key );
1568         if (!keystr) {
1569                 goto done;
1570         }
1571         keystr = normalize_reg_path(ctx, keystr);
1572         if (!keystr) {
1573                 goto done;
1574         }
1575
1576         old_data = dbwrap_fetch_bystring(regdb, ctx, keystr);
1577
1578         if ((old_data.dptr != NULL)
1579             && (old_data.dsize == data.dsize)
1580             && (memcmp(old_data.dptr, data.dptr, data.dsize) == 0))
1581         {
1582                 result = true;
1583                 goto done;
1584         }
1585
1586         status = dbwrap_trans_store_bystring(regdb, keystr, data, TDB_REPLACE);
1587
1588         result = NT_STATUS_IS_OK(status);
1589
1590 done:
1591         TALLOC_FREE(ctx);
1592         return result;
1593 }
1594
1595 static WERROR regdb_get_secdesc(TALLOC_CTX *mem_ctx, const char *key,
1596                                 struct security_descriptor **psecdesc)
1597 {
1598         char *tdbkey;
1599         TDB_DATA data;
1600         NTSTATUS status;
1601         TALLOC_CTX *tmp_ctx = talloc_stackframe();
1602         WERROR err = WERR_OK;
1603
1604         DEBUG(10, ("regdb_get_secdesc: Getting secdesc of key [%s]\n", key));
1605
1606         if (!regdb_key_exists(regdb, key)) {
1607                 err = WERR_BADFILE;
1608                 goto done;
1609         }
1610
1611         tdbkey = talloc_asprintf(tmp_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1612         if (tdbkey == NULL) {
1613                 err = WERR_NOMEM;
1614                 goto done;
1615         }
1616         normalize_dbkey(tdbkey);
1617
1618         data = dbwrap_fetch_bystring(regdb, tmp_ctx, tdbkey);
1619         if (data.dptr == NULL) {
1620                 err = WERR_BADFILE;
1621                 goto done;
1622         }
1623
1624         status = unmarshall_sec_desc(mem_ctx, (uint8 *)data.dptr, data.dsize,
1625                                      psecdesc);
1626
1627         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1628                 err = WERR_NOMEM;
1629         } else if (!NT_STATUS_IS_OK(status)) {
1630                 err = WERR_REG_CORRUPT;
1631         }
1632
1633 done:
1634         TALLOC_FREE(tmp_ctx);
1635         return err;
1636 }
1637
1638 static WERROR regdb_set_secdesc(const char *key,
1639                                 struct security_descriptor *secdesc)
1640 {
1641         TALLOC_CTX *mem_ctx = talloc_stackframe();
1642         char *tdbkey;
1643         WERROR err = WERR_NOMEM;
1644         TDB_DATA tdbdata;
1645
1646         if (!regdb_key_exists(regdb, key)) {
1647                 err = WERR_BADFILE;
1648                 goto done;
1649         }
1650
1651         tdbkey = talloc_asprintf(mem_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1652         if (tdbkey == NULL) {
1653                 goto done;
1654         }
1655         normalize_dbkey(tdbkey);
1656
1657         if (secdesc == NULL) {
1658                 /* assuming a delete */
1659                 err = ntstatus_to_werror(dbwrap_trans_delete_bystring(regdb,
1660                                                                       tdbkey));
1661                 goto done;
1662         }
1663
1664         err = ntstatus_to_werror(marshall_sec_desc(mem_ctx, secdesc,
1665                                                    &tdbdata.dptr,
1666                                                    &tdbdata.dsize));
1667         W_ERROR_NOT_OK_GOTO_DONE(err);
1668
1669         err = ntstatus_to_werror(dbwrap_trans_store_bystring(regdb, tdbkey,
1670                                                              tdbdata, 0));
1671
1672  done:
1673         TALLOC_FREE(mem_ctx);
1674         return err;
1675 }
1676
1677 bool regdb_subkeys_need_update(struct regsubkey_ctr *subkeys)
1678 {
1679         return (regdb_get_seqnum() != regsubkey_ctr_get_seqnum(subkeys));
1680 }
1681
1682 bool regdb_values_need_update(struct regval_ctr *values)
1683 {
1684         return (regdb_get_seqnum() != values->seqnum);
1685 }
1686
1687 /*
1688  * Table of function pointers for default access
1689  */
1690
1691 struct registry_ops regdb_ops = {
1692         .fetch_subkeys = regdb_fetch_keys,
1693         .fetch_values = regdb_fetch_values,
1694         .store_subkeys = regdb_store_keys,
1695         .store_values = regdb_store_values,
1696         .create_subkey = regdb_create_subkey,
1697         .delete_subkey = regdb_delete_subkey,
1698         .get_secdesc = regdb_get_secdesc,
1699         .set_secdesc = regdb_set_secdesc,
1700         .subkeys_need_update = regdb_subkeys_need_update,
1701         .values_need_update = regdb_values_need_update
1702 };