source/registry/reg_backend_db.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  Virtual Windows Registry Layer
   4  *  Copyright (C) Gerald Carter                     2002-2005
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 /* Implementation of internal registry database functions. */
  21
  22 #include "includes.h"
  23
  24 #undef DBGC_CLASS
  25 #define DBGC_CLASS DBGC_REGISTRY
  26
  27 static struct db_context *regdb = NULL;
  28 static int regdb_refcount;
  29
  30 /* List the deepest path into the registry.  All part components will be created.*/
  31
  32 /* If you want to have a part of the path controlled by the tdb and part by
  33    a virtual registry db (e.g. printing), then you have to list the deepest path.
  34    For example,"HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion/Print"
  35    allows the reg_db backend to handle everything up to
  36    "HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion" and then we'll hook
  37    the reg_printing backend onto the last component of the path (see
  38    KEY_PRINTING_2K in include/rpc_reg.h)   --jerry */
  39
  40 static const char *builtin_registry_paths[] = {
  41         KEY_PRINTING_2K,
  42         KEY_PRINTING_PORTS,
  43         KEY_PRINTING,
  44         KEY_SHARES,
  45         KEY_EVENTLOG,
  46         KEY_SMBCONF,
  47         KEY_PERFLIB,
  48         KEY_PERFLIB_009,
  49         KEY_GROUP_POLICY,
  50         KEY_SAMBA_GROUP_POLICY,
  51         KEY_GP_MACHINE_POLICY,
  52         KEY_GP_MACHINE_WIN_POLICY,
  53         KEY_HKCU,
  54         KEY_GP_USER_POLICY,
  55         KEY_GP_USER_WIN_POLICY,
  56         KEY_WINLOGON_GPEXT_PATH,
  57         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Print\\Monitors",
  58         KEY_PROD_OPTIONS,
  59         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Terminal Server\\DefaultUserConfiguration",
  60         KEY_TCPIP_PARAMS,
  61         KEY_NETLOGON_PARAMS,
  62         KEY_HKU,
  63         KEY_HKCR,
  64         KEY_HKPD,
  65         KEY_HKPT,
  66          NULL };
  67
  68 struct builtin_regkey_value {
  69         const char *path;
  70         const char *valuename;
  71         uint32 type;
  72         union {
  73                 const char *string;
  74                 uint32 dw_value;
  75         } data;
  76 };
  77
  78 static struct builtin_regkey_value builtin_registry_values[] = {
  79         { KEY_PRINTING_PORTS,
  80                 SAMBA_PRINTER_PORT_NAME, REG_SZ, { "" } },
  81         { KEY_PRINTING_2K,
  82                 "DefaultSpoolDirectory", REG_SZ, { "C:\\Windows\\System32\\Spool\\Printers" } },
  83         { KEY_EVENTLOG,
  84                 "DisplayName", REG_SZ, { "Event Log" } },
  85         { KEY_EVENTLOG,
  86                 "ErrorControl", REG_DWORD, { (char*)0x00000001 } },
  87         { NULL, NULL, 0, { NULL } }
  88 };
  89
  90 /**
  91  * Initialize a key in the registry:
  92  * create each component key of the specified path.
  93  */
  94 static bool init_registry_key_internal(const char *add_path)
  95 {
  96         bool ret = false;
  97         TALLOC_CTX *frame = talloc_stackframe();
  98         char *path = NULL;
  99         char *base = NULL;
 100         char *remaining = NULL;
 101         char *keyname;
 102         char *subkeyname;
 103         REGSUBKEY_CTR *subkeys;
 104         const char *p, *p2;
 105
 106         DEBUG(6, ("init_registry_key: Adding [%s]\n", add_path));
 107
 108         path = talloc_strdup(frame, add_path);
 109         base = talloc_strdup(frame, "");
 110         if (!path || !base) {
 111                 goto fail;
 112         }
 113         p = path;
 114
 115         while (next_token_talloc(frame, &p, &keyname, "\\")) {
 116
 117                 /* build up the registry path from the components */
 118
 119                 if (*base) {
 120                         base = talloc_asprintf(frame, "%s\\", base);
 121                         if (!base) {
 122                                 goto fail;
 123                         }
 124                 }
 125                 base = talloc_asprintf_append(base, "%s", keyname);
 126                 if (!base) {
 127                         goto fail;
 128                 }
 129
 130                 /* get the immediate subkeyname (if we have one ) */
 131
 132                 subkeyname = talloc_strdup(frame, "");
 133                 if (!subkeyname) {
 134                         goto fail;
 135                 }
 136                 if (*p) {
 137                         remaining = talloc_strdup(frame, p);
 138                         if (!remaining) {
 139                                 goto fail;
 140                         }
 141                         p2 = remaining;
 142
 143                         if (!next_token_talloc(frame, &p2,
 144                                                 &subkeyname, "\\"))
 145                         {
 146                                 subkeyname = talloc_strdup(frame,p2);
 147                                 if (!subkeyname) {
 148                                         goto fail;
 149                                 }
 150                         }
 151                 }
 152
 153                 DEBUG(10,("init_registry_key: Storing key [%s] with "
 154                           "subkey [%s]\n", base,
 155                           *subkeyname ? subkeyname : "NULL"));
 156
 157                 /* we don't really care if the lookup succeeds or not
 158                  * since we are about to update the record.
 159                  * We just want any subkeys already present */
 160
 161                 if (!(subkeys = TALLOC_ZERO_P(frame, REGSUBKEY_CTR))) {
 162                         DEBUG(0,("talloc() failure!\n"));
 163                         goto fail;
 164                 }
 165
 166                 regdb_fetch_keys(base, subkeys);
 167                 if (*subkeyname) {
 168                         regsubkey_ctr_addkey( subkeys, subkeyname);
 169                 }
 170                 if (!regdb_store_keys( base, subkeys)) {
 171                         goto fail;
 172                 }
 173         }
 174
 175         ret = true;
 176 fail:
 177         TALLOC_FREE(frame);
 178         return ret;
 179 }
 180
 181 /**
 182  * Initialize a key in the registry:
 183  * create each component key of the specified path,
 184  * wrapped in one db transaction.
 185  */
 186 bool init_registry_key(const char *add_path)
 187 {
 188         if (regdb->transaction_start(regdb) == -1) {
 189                 DEBUG(0, ("init_registry_key: transaction_start failed\n"));
 190                 return false;
 191         }
 192
 193         if (!init_registry_key_internal(add_path)) {
 194                 goto fail;
 195         }
 196
 197         if (regdb->transaction_commit(regdb) == -1) {
 198                 DEBUG(0, ("init_registry_key: Could not commit transaction\n"));
 199                 return false;
 200         }
 201
 202         return true;
 203
 204 fail:
 205         if (regdb->transaction_cancel(regdb) == -1) {
 206                 smb_panic("init_registry_key: transaction_cancel failed\n");
 207         }
 208
 209         return false;
 210 }
 211
 212 /***********************************************************************
 213  Open the registry data in the tdb
 214  ***********************************************************************/
 215
 216 bool init_registry_data(void)
 217 {
 218         TALLOC_CTX *frame = NULL;
 219         REGVAL_CTR *values;
 220         int i;
 221         UNISTR2 data;
 222
 223         /*
 224          * There are potentially quite a few store operations which are all
 225          * indiviually wrapped in tdb transactions. Wrapping them in a single
 226          * transaction gives just a single transaction_commit() to actually do
 227          * its fsync()s. See tdb/common/transaction.c for info about nested
 228          * transaction behaviour.
 229          */
 230
 231         if (regdb->transaction_start(regdb) == -1) {
 232                 DEBUG(0, ("init_registry_data: tdb_transaction_start "
 233                           "failed\n"));
 234                 return false;
 235         }
 236
 237         /* loop over all of the predefined paths and add each component */
 238
 239         for (i=0; builtin_registry_paths[i] != NULL; i++) {
 240                 if (!init_registry_key_internal(builtin_registry_paths[i])) {
 241                         goto fail;
 242                 }
 243         }
 244
 245         /* loop over all of the predefined values and add each component */
 246
 247         frame = talloc_stackframe();
 248
 249         for (i=0; builtin_registry_values[i].path != NULL; i++) {
 250
 251                 values = TALLOC_ZERO_P(frame, REGVAL_CTR);
 252                 if (values == NULL) {
 253                         goto fail;
 254                 }
 255
 256                 regdb_fetch_values(builtin_registry_values[i].path, values);
 257
 258                 /* preserve existing values across restarts. Only add new ones */
 259
 260                 if (!regval_ctr_key_exists(values,
 261                                         builtin_registry_values[i].valuename))
 262                 {
 263                         switch(builtin_registry_values[i].type) {
 264                         case REG_DWORD:
 265                                 regval_ctr_addvalue(values,
 266                                         builtin_registry_values[i].valuename,
 267                                         REG_DWORD,
 268                                         (char*)&builtin_registry_values[i].data.dw_value,
 269                                         sizeof(uint32));
 270                                 break;
 271
 272                         case REG_SZ:
 273                                 init_unistr2(&data,
 274                                         builtin_registry_values[i].data.string,
 275                                         UNI_STR_TERMINATE);
 276                                 regval_ctr_addvalue(values,
 277                                         builtin_registry_values[i].valuename,
 278                                         REG_SZ,
 279                                         (char*)data.buffer,
 280                                         data.uni_str_len*sizeof(uint16));
 281                                 break;
 282
 283                         default:
 284                                 DEBUG(0, ("init_registry_data: invalid value "
 285                                           "type in builtin_registry_values "
 286                                           "[%d]\n",
 287                                           builtin_registry_values[i].type));
 288                         }
 289                         regdb_store_values(builtin_registry_values[i].path,
 290                                            values);
 291                 }
 292                 TALLOC_FREE(values);
 293         }
 294
 295         TALLOC_FREE(frame);
 296
 297         if (regdb->transaction_commit(regdb) == -1) {
 298                 DEBUG(0, ("init_registry_data: Could not commit "
 299                           "transaction\n"));
 300                 return false;
 301         }
 302
 303         return true;
 304
 305  fail:
 306
 307         TALLOC_FREE(frame);
 308
 309         if (regdb->transaction_cancel(regdb) == -1) {
 310                 smb_panic("init_registry_data: tdb_transaction_cancel "
 311                           "failed\n");
 312         }
 313
 314         return false;
 315 }
 316
 317 /***********************************************************************
 318  Open the registry database
 319  ***********************************************************************/
 320
 321 bool regdb_init( void )
 322 {
 323         const char *vstring = "INFO/version";
 324         uint32 vers_id;
 325
 326         if ( regdb ) {
 327                 DEBUG(10,("regdb_init: incrementing refcount (%d)\n", regdb_refcount));
 328                 regdb_refcount++;
 329                 return true;
 330         }
 331
 332         if ( !(regdb = db_open(NULL, state_path("registry.tdb"), 0, REG_TDB_FLAGS, O_RDWR, 0600)) )
 333         {
 334                 regdb = db_open(NULL, state_path("registry.tdb"), 0, REG_TDB_FLAGS, O_RDWR|O_CREAT, 0600);
 335                 if ( !regdb ) {
 336                         DEBUG(0,("regdb_init: Failed to open registry %s (%s)\n",
 337                                 state_path("registry.tdb"), strerror(errno) ));
 338                         return false;
 339                 }
 340
 341                 DEBUG(10,("regdb_init: Successfully created registry tdb\n"));
 342         }
 343
 344         regdb_refcount = 1;
 345
 346         vers_id = dbwrap_fetch_int32(regdb, vstring);
 347
 348         if ( vers_id != REGVER_V1 ) {
 349                 /* any upgrade code here if needed */
 350                 DEBUG(10, ("regdb_init: got INFO/version = %d != %d\n",
 351                            vers_id, REGVER_V1));
 352         }
 353
 354         return true;
 355 }
 356
 357 /***********************************************************************
 358  Open the registry.  Must already have been initialized by regdb_init()
 359  ***********************************************************************/
 360
 361 WERROR regdb_open( void )
 362 {
 363         WERROR result = WERR_OK;
 364
 365         if ( regdb ) {
 366                 DEBUG(10,("regdb_open: incrementing refcount (%d)\n", regdb_refcount));
 367                 regdb_refcount++;
 368                 return WERR_OK;
 369         }
 370
 371         become_root();
 372
 373         regdb = db_open(NULL, state_path("registry.tdb"), 0, REG_TDB_FLAGS, O_RDWR, 0600);
 374         if ( !regdb ) {
 375                 result = ntstatus_to_werror( map_nt_error_from_unix( errno ) );
 376                 DEBUG(0,("regdb_open: Failed to open %s! (%s)\n",
 377                         state_path("registry.tdb"), strerror(errno) ));
 378         }
 379
 380         unbecome_root();
 381
 382         regdb_refcount = 1;
 383         DEBUG(10,("regdb_open: refcount reset (%d)\n", regdb_refcount));
 384
 385         return result;
 386 }
 387
 388 /***********************************************************************
 389  ***********************************************************************/
 390
 391 int regdb_close( void )
 392 {
 393         if (regdb_refcount == 0) {
 394                 return 0;
 395         }
 396
 397         regdb_refcount--;
 398
 399         DEBUG(10,("regdb_close: decrementing refcount (%d)\n", regdb_refcount));
 400
 401         if ( regdb_refcount > 0 )
 402                 return 0;
 403
 404         SMB_ASSERT( regdb_refcount >= 0 );
 405
 406         TALLOC_FREE(regdb);
 407         return 0;
 408 }
 409
 410 /***********************************************************************
 411  return the tdb sequence number of the registry tdb.
 412  this is an indicator for the content of the registry
 413  having changed. it will change upon regdb_init, too, though.
 414  ***********************************************************************/
 415 int regdb_get_seqnum(void)
 416 {
 417         return regdb->get_seqnum(regdb);
 418 }
 419
 420 /***********************************************************************
 421  Add subkey strings to the registry tdb under a defined key
 422  fmt is the same format as tdb_pack except this function only supports
 423  fstrings
 424  ***********************************************************************/
 425
 426 static bool regdb_store_keys_internal(const char *key, REGSUBKEY_CTR *ctr)
 427 {
 428         TDB_DATA dbuf;
 429         uint8 *buffer = NULL;
 430         int i = 0;
 431         uint32 len, buflen;
 432         bool ret = true;
 433         uint32 num_subkeys = regsubkey_ctr_numkeys(ctr);
 434         char *keyname = NULL;
 435         TALLOC_CTX *ctx = talloc_stackframe();
 436         NTSTATUS status;
 437
 438         if (!key) {
 439                 return false;
 440         }
 441
 442         keyname = talloc_strdup(ctx, key);
 443         if (!keyname) {
 444                 return false;
 445         }
 446         keyname = normalize_reg_path(ctx, keyname);
 447
 448         /* allocate some initial memory */
 449
 450         buffer = (uint8 *)SMB_MALLOC(1024);
 451         if (buffer == NULL) {
 452                 return false;
 453         }
 454         buflen = 1024;
 455         len = 0;
 456
 457         /* store the number of subkeys */
 458
 459         len += tdb_pack(buffer+len, buflen-len, "d", num_subkeys);
 460
 461         /* pack all the strings */
 462
 463         for (i=0; i<num_subkeys; i++) {
 464                 len += tdb_pack(buffer+len, buflen-len, "f",
 465                                 regsubkey_ctr_specific_key(ctr, i));
 466                 if (len > buflen) {
 467                         /* allocate some extra space */
 468                         buffer = (uint8 *)SMB_REALLOC(buffer, len*2);
 469                         if(buffer == NULL) {
 470                                 DEBUG(0, ("regdb_store_keys: Failed to realloc "
 471                                           "memory of size [%d]\n", len*2));
 472                                 ret = false;
 473                                 goto done;
 474                         }
 475                         buflen = len*2;
 476                         len = tdb_pack(buffer+len, buflen-len, "f",
 477                                        regsubkey_ctr_specific_key(ctr, i));
 478                 }
 479         }
 480
 481         /* finally write out the data */
 482
 483         dbuf.dptr = buffer;
 484         dbuf.dsize = len;
 485         status = dbwrap_store_bystring(regdb, keyname, dbuf, TDB_REPLACE);
 486         if (!NT_STATUS_IS_OK(status)) {
 487                 ret = false;
 488                 goto done;
 489         }
 490
 491 done:
 492         TALLOC_FREE(ctx);
 493         SAFE_FREE(buffer);
 494         return ret;
 495 }
 496
 497 /***********************************************************************
 498  Store the new subkey record and create any child key records that
 499  do not currently exist
 500  ***********************************************************************/
 501
 502 bool regdb_store_keys(const char *key, REGSUBKEY_CTR *ctr)
 503 {
 504         int num_subkeys, i;
 505         char *path = NULL;
 506         REGSUBKEY_CTR *subkeys = NULL, *old_subkeys = NULL;
 507         char *oldkeyname = NULL;
 508         TALLOC_CTX *ctx = talloc_stackframe();
 509         NTSTATUS status;
 510
 511         /*
 512          * fetch a list of the old subkeys so we can determine if anything has
 513          * changed
 514          */
 515
 516         if (!(old_subkeys = TALLOC_ZERO_P(ctx, REGSUBKEY_CTR))) {
 517                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 518                 return false;
 519         }
 520
 521         regdb_fetch_keys(key, old_subkeys);
 522
 523         if ((ctr->num_subkeys && old_subkeys->num_subkeys) &&
 524             (ctr->num_subkeys == old_subkeys->num_subkeys)) {
 525
 526                 for (i = 0; i<ctr->num_subkeys; i++) {
 527                         if (strcmp(ctr->subkeys[i],
 528                                    old_subkeys->subkeys[i]) != 0) {
 529                                 break;
 530                         }
 531                 }
 532                 if (i == ctr->num_subkeys) {
 533                         /*
 534                          * Nothing changed, no point to even start a tdb
 535                          * transaction
 536                          */
 537                         TALLOC_FREE(old_subkeys);
 538                         return true;
 539                 }
 540         }
 541
 542         TALLOC_FREE(old_subkeys);
 543
 544         if (regdb->transaction_start(regdb) == -1) {
 545                 DEBUG(0, ("regdb_store_keys: transaction_start failed\n"));
 546                 goto fail;
 547         }
 548
 549         /*
 550          * Re-fetch the old keys inside the transaction
 551          */
 552
 553         if (!(old_subkeys = TALLOC_ZERO_P(ctx, REGSUBKEY_CTR))) {
 554                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 555                 goto cancel;
 556         }
 557
 558         regdb_fetch_keys(key, old_subkeys);
 559
 560         /* store the subkey list for the parent */
 561
 562         if (!regdb_store_keys_internal(key, ctr) ) {
 563                 DEBUG(0,("regdb_store_keys: Failed to store new subkey list "
 564                          "for parent [%s]\n", key));
 565                 goto cancel;
 566         }
 567
 568         /* now delete removed keys */
 569
 570         num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
 571         for (i=0; i<num_subkeys; i++) {
 572                 oldkeyname = regsubkey_ctr_specific_key(old_subkeys, i);
 573
 574                 if (regsubkey_ctr_key_exists(ctr, oldkeyname)) {
 575                         /*
 576                          * It's still around, don't delete
 577                          */
 578
 579                         continue;
 580                 }
 581
 582                 path = talloc_asprintf(ctx, "%s/%s", key, oldkeyname);
 583                 if (!path) {
 584                         goto cancel;
 585                 }
 586                 path = normalize_reg_path(ctx, path);
 587                 if (!path) {
 588                         goto cancel;
 589                 }
 590                 status = dbwrap_delete_bystring(regdb, path);
 591                 if (!NT_STATUS_IS_OK(status)) {
 592                         DEBUG(1, ("Deleting %s failed\n", path));
 593                         goto cancel;
 594                 }
 595
 596                 TALLOC_FREE(path);
 597                 path = talloc_asprintf(ctx, "%s/%s/%s",
 598                                 REG_VALUE_PREFIX,
 599                                 key,
 600                                 oldkeyname );
 601                 if (!path) {
 602                         goto cancel;
 603                 }
 604                 path = normalize_reg_path(ctx, path);
 605                 if (!path) {
 606                         goto cancel;
 607                 }
 608
 609                 /*
 610                  * Ignore errors here, we might have no values around
 611                  */
 612                 dbwrap_delete_bystring(regdb, path);
 613                 TALLOC_FREE(path);
 614         }
 615
 616         TALLOC_FREE(old_subkeys);
 617
 618         /* now create records for any subkeys that don't already exist */
 619
 620         num_subkeys = regsubkey_ctr_numkeys(ctr);
 621
 622         if (num_subkeys == 0) {
 623                 if (!(subkeys = TALLOC_ZERO_P(ctx, REGSUBKEY_CTR)) ) {
 624                         DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 625                         goto cancel;
 626                 }
 627
 628                 if (!regdb_store_keys_internal(key, subkeys)) {
 629                         DEBUG(0,("regdb_store_keys: Failed to store "
 630                                  "new record for key [%s]\n", key));
 631                         goto cancel;
 632                 }
 633                 TALLOC_FREE(subkeys);
 634
 635         }
 636
 637         for (i=0; i<num_subkeys; i++) {
 638                 path = talloc_asprintf(ctx, "%s/%s",
 639                                         key,
 640                                         regsubkey_ctr_specific_key(ctr, i));
 641                 if (!path) {
 642                         goto cancel;
 643                 }
 644                 if (!(subkeys = TALLOC_ZERO_P(ctx, REGSUBKEY_CTR)) ) {
 645                         DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 646                         goto cancel;
 647                 }
 648
 649                 if (regdb_fetch_keys( path, subkeys ) == -1) {
 650                         /* create a record with 0 subkeys */
 651                         if (!regdb_store_keys_internal(path, subkeys)) {
 652                                 DEBUG(0,("regdb_store_keys: Failed to store "
 653                                          "new record for key [%s]\n", path));
 654                                 goto cancel;
 655                         }
 656                 }
 657
 658                 TALLOC_FREE(subkeys);
 659                 TALLOC_FREE(path);
 660         }
 661
 662         if (regdb->transaction_commit(regdb) == -1) {
 663                 DEBUG(0, ("regdb_store_keys: Could not commit transaction\n"));
 664                 goto fail;
 665         }
 666
 667         TALLOC_FREE(ctx);
 668         return true;
 669
 670 cancel:
 671         if (regdb->transaction_cancel(regdb) == -1) {
 672                 smb_panic("regdb_store_keys: transaction_cancel failed\n");
 673         }
 674
 675 fail:
 676         TALLOC_FREE(ctx);
 677
 678         return false;
 679 }
 680
 681
 682 /***********************************************************************
 683  Retrieve an array of strings containing subkeys.  Memory should be
 684  released by the caller.
 685  ***********************************************************************/
 686
 687 int regdb_fetch_keys(const char *key, REGSUBKEY_CTR *ctr)
 688 {
 689         char *path = NULL;
 690         uint32 num_items;
 691         uint8 *buf;
 692         uint32 buflen, len;
 693         int i;
 694         fstring subkeyname;
 695         int ret = -1;
 696         TALLOC_CTX *frame = talloc_stackframe();
 697         struct db_record *rec;
 698
 699         DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL"));
 700
 701         path = talloc_strdup(frame, key);
 702         if (!path) {
 703                 goto fail;
 704         }
 705
 706         /* convert to key format */
 707         path = talloc_string_sub(frame, path, "\\", "/");
 708         if (!path) {
 709                 goto fail;
 710         }
 711         strupper_m(path);
 712
 713         rec = regdb->fetch_locked(regdb, frame, string_term_tdb_data(path));
 714         if (rec == NULL) {
 715                 ret = 0;
 716                 goto fail;
 717         }
 718
 719         ctr->seqnum = regdb_get_seqnum();
 720
 721         buf = rec->value.dptr;
 722         buflen = rec->value.dsize;
 723
 724         if ( !buf ) {
 725                 DEBUG(5,("regdb_fetch_keys: tdb lookup failed to locate key [%s]\n", key));
 726                 goto fail;
 727         }
 728
 729         len = tdb_unpack( buf, buflen, "d", &num_items);
 730
 731         for (i=0; i<num_items; i++) {
 732                 len += tdb_unpack(buf+len, buflen-len, "f", subkeyname);
 733                 regsubkey_ctr_addkey(ctr, subkeyname);
 734         }
 735
 736         DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items));
 737
 738         ret = num_items;
 739  fail:
 740         TALLOC_FREE(frame);
 741         return ret;
 742 }
 743
 744 /****************************************************************************
 745  Unpack a list of registry values frem the TDB
 746  ***************************************************************************/
 747
 748 static int regdb_unpack_values(REGVAL_CTR *values, uint8 *buf, int buflen)
 749 {
 750         int             len = 0;
 751         uint32          type;
 752         fstring valuename;
 753         uint32          size;
 754         uint8           *data_p;
 755         uint32          num_values = 0;
 756         int             i;
 757
 758         /* loop and unpack the rest of the registry values */
 759
 760         len += tdb_unpack(buf+len, buflen-len, "d", &num_values);
 761
 762         for ( i=0; i<num_values; i++ ) {
 763                 /* unpack the next regval */
 764
 765                 type = REG_NONE;
 766                 size = 0;
 767                 data_p = NULL;
 768                 valuename[0] = '\0';
 769                 len += tdb_unpack(buf+len, buflen-len, "fdB",
 770                                   valuename,
 771                                   &type,
 772                                   &size,
 773                                   &data_p);
 774
 775                 /* add the new value. Paranoid protective code -- make sure data_p is valid */
 776
 777                 if (*valuename && size && data_p) {
 778                         regval_ctr_addvalue(values, valuename, type,
 779                                         (const char *)data_p, size);
 780                 }
 781                 SAFE_FREE(data_p); /* 'B' option to tdb_unpack does a malloc() */
 782
 783                 DEBUG(8,("specific: [%s], len: %d\n", valuename, size));
 784         }
 785
 786         return len;
 787 }
 788
 789 /****************************************************************************
 790  Pack all values in all printer keys
 791  ***************************************************************************/
 792
 793 static int regdb_pack_values(REGVAL_CTR *values, uint8 *buf, int buflen)
 794 {
 795         int             len = 0;
 796         int             i;
 797         REGISTRY_VALUE  *val;
 798         int             num_values;
 799
 800         if ( !values )
 801                 return 0;
 802
 803         num_values = regval_ctr_numvals( values );
 804
 805         /* pack the number of values first */
 806
 807         len += tdb_pack( buf+len, buflen-len, "d", num_values );
 808
 809         /* loop over all values */
 810
 811         for ( i=0; i<num_values; i++ ) {
 812                 val = regval_ctr_specific_value( values, i );
 813                 len += tdb_pack(buf+len, buflen-len, "fdB",
 814                                 regval_name(val),
 815                                 regval_type(val),
 816                                 regval_size(val),
 817                                 regval_data_p(val) );
 818         }
 819
 820         return len;
 821 }
 822
 823 /***********************************************************************
 824  Retrieve an array of strings containing subkeys.  Memory should be
 825  released by the caller.
 826  ***********************************************************************/
 827
 828 int regdb_fetch_values( const char* key, REGVAL_CTR *values )
 829 {
 830         char *keystr = NULL;
 831         TALLOC_CTX *ctx = talloc_stackframe();
 832         struct db_record *rec;
 833         int ret = 0;
 834
 835         DEBUG(10,("regdb_fetch_values: Looking for value of key [%s] \n", key));
 836
 837         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key);
 838         if (!keystr) {
 839                 return 0;
 840         }
 841         keystr = normalize_reg_path(ctx, keystr);
 842         if (!keystr) {
 843                 goto done;
 844         }
 845
 846         rec = regdb->fetch_locked(regdb, ctx, string_term_tdb_data(keystr));
 847         if (rec == NULL) {
 848                 goto done;
 849         }
 850
 851         values->seqnum = regdb_get_seqnum();
 852
 853         if (!rec->value.dptr) {
 854                 /* all keys have zero values by default */
 855                 goto done;
 856         }
 857
 858         regdb_unpack_values(values, rec->value.dptr, rec->value.dsize);
 859         ret = regval_ctr_numvals(values);
 860
 861 done:
 862         TALLOC_FREE(ctx);
 863         return ret;
 864 }
 865
 866 bool regdb_store_values( const char *key, REGVAL_CTR *values )
 867 {
 868         TDB_DATA old_data, data;
 869         char *keystr = NULL;
 870         TALLOC_CTX *ctx = talloc_stackframe();
 871         int len, ret;
 872         bool result = false;
 873
 874         DEBUG(10,("regdb_store_values: Looking for value of key [%s] \n", key));
 875
 876         ZERO_STRUCT(data);
 877
 878         len = regdb_pack_values(values, data.dptr, data.dsize);
 879         if (len <= 0) {
 880                 DEBUG(0,("regdb_store_values: unable to pack values. len <= 0\n"));
 881                 goto done;
 882         }
 883
 884         data.dptr = TALLOC_ARRAY(ctx, uint8, len);
 885         data.dsize = len;
 886
 887         len = regdb_pack_values(values, data.dptr, data.dsize);
 888
 889         SMB_ASSERT( len == data.dsize );
 890
 891         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key );
 892         if (!keystr) {
 893                 goto done;
 894         }
 895         keystr = normalize_reg_path(ctx, keystr);
 896         if (!keystr) {
 897                 goto done;
 898         }
 899
 900         old_data = dbwrap_fetch_bystring(regdb, ctx, keystr);
 901
 902         if ((old_data.dptr != NULL)
 903             && (old_data.dsize == data.dsize)
 904             && (memcmp(old_data.dptr, data.dptr, data.dsize) == 0))
 905         {
 906                 result = true;
 907                 goto done;
 908         }
 909
 910         ret = dbwrap_trans_store(regdb, string_term_tdb_data(keystr), data,
 911                                  TDB_REPLACE);
 912         result = (ret != -1);
 913
 914 done:
 915         TALLOC_FREE(ctx);
 916         return result;
 917 }
 918
 919 static WERROR regdb_get_secdesc(TALLOC_CTX *mem_ctx, const char *key,
 920                                 struct security_descriptor **psecdesc)
 921 {
 922         char *tdbkey;
 923         TDB_DATA data;
 924         NTSTATUS status;
 925         TALLOC_CTX *tmp_ctx = talloc_stackframe();
 926         WERROR err = WERR_OK;
 927
 928         DEBUG(10, ("regdb_get_secdesc: Getting secdesc of key [%s]\n", key));
 929
 930         tdbkey = talloc_asprintf(tmp_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
 931         if (tdbkey == NULL) {
 932                 err = WERR_NOMEM;
 933                 goto done;
 934         }
 935         normalize_dbkey(tdbkey);
 936
 937         data = dbwrap_fetch_bystring(regdb, tmp_ctx, tdbkey);
 938         if (data.dptr == NULL) {
 939                 err = WERR_BADFILE;
 940                 goto done;
 941         }
 942
 943         status = unmarshall_sec_desc(mem_ctx, (uint8 *)data.dptr, data.dsize,
 944                                      psecdesc);
 945
 946         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
 947                 err = WERR_NOMEM;
 948         } else if (!NT_STATUS_IS_OK(status)) {
 949                 err = WERR_REG_CORRUPT;
 950         }
 951
 952 done:
 953         TALLOC_FREE(tmp_ctx);
 954         return err;
 955 }
 956
 957 static WERROR regdb_set_secdesc(const char *key,
 958                                 struct security_descriptor *secdesc)
 959 {
 960         TALLOC_CTX *mem_ctx = talloc_stackframe();
 961         char *tdbkey;
 962         WERROR err = WERR_NOMEM;
 963         TDB_DATA tdbdata;
 964         int tdb_ret;
 965
 966         tdbkey = talloc_asprintf(mem_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
 967         if (tdbkey == NULL) {
 968                 goto done;
 969         }
 970         normalize_dbkey(tdbkey);
 971
 972         if (secdesc == NULL) {
 973                 /* assuming a delete */
 974                 tdb_ret = dbwrap_trans_delete(regdb,
 975                                               string_term_tdb_data(tdbkey));
 976                 if (tdb_ret == -1) {
 977                         err = ntstatus_to_werror(map_nt_error_from_unix(errno));
 978                 } else {
 979                         err = WERR_OK;
 980                 }
 981                 goto done;
 982         }
 983
 984         err = ntstatus_to_werror(marshall_sec_desc(mem_ctx, secdesc,
 985                                                    &tdbdata.dptr,
 986                                                    &tdbdata.dsize));
 987         if (!W_ERROR_IS_OK(err)) {
 988                 goto done;
 989         }
 990
 991         tdb_ret = dbwrap_trans_store(regdb, string_term_tdb_data(tdbkey),
 992                                      tdbdata, 0);
 993         if (tdb_ret == -1) {
 994                 err = ntstatus_to_werror(map_nt_error_from_unix(errno));
 995                 goto done;
 996         }
 997
 998  done:
 999         TALLOC_FREE(mem_ctx);
1000         return err;
1001 }
1002
1003 bool regdb_subkeys_need_update(REGSUBKEY_CTR *subkeys)
1004 {
1005         return (regdb_get_seqnum() != subkeys->seqnum);
1006 }
1007
1008 bool regdb_values_need_update(REGVAL_CTR *values)
1009 {
1010         return (regdb_get_seqnum() != values->seqnum);
1011 }
1012
1013 /*
1014  * Table of function pointers for default access
1015  */
1016
1017 REGISTRY_OPS regdb_ops = {
1018         .fetch_subkeys = regdb_fetch_keys,
1019         .fetch_values = regdb_fetch_values,
1020         .store_subkeys = regdb_store_keys,
1021         .store_values = regdb_store_values,
1022         .get_secdesc = regdb_get_secdesc,
1023         .set_secdesc = regdb_set_secdesc,
1024         .subkeys_need_update = regdb_subkeys_need_update,
1025         .values_need_update = regdb_values_need_update
1026 };