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 /* 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",
 328                           regdb_refcount));
 329                 regdb_refcount++;
 330                 return true;
 331         }
 332
 333         regdb = db_open(NULL, state_path("registry.tdb"), 0, REG_TDB_FLAGS,
 334                         O_RDWR, 0600);
 335         if (!regdb) {
 336                 regdb = db_open(NULL, state_path("registry.tdb"), 0,
 337                                 REG_TDB_FLAGS, O_RDWR|O_CREAT, 0600);
 338                 if (!regdb) {
 339                         DEBUG(0,("regdb_init: Failed to open registry %s (%s)\n",
 340                                 state_path("registry.tdb"), strerror(errno) ));
 341                         return false;
 342                 }
 343
 344                 DEBUG(10,("regdb_init: Successfully created registry tdb\n"));
 345         }
 346
 347         regdb_refcount = 1;
 348
 349         vers_id = dbwrap_fetch_int32(regdb, vstring);
 350
 351         if ( vers_id != REGVER_V1 ) {
 352                 /* any upgrade code here if needed */
 353                 DEBUG(10, ("regdb_init: got INFO/version = %d != %d\n",
 354                            vers_id, REGVER_V1));
 355         }
 356
 357         return true;
 358 }
 359
 360 /***********************************************************************
 361  Open the registry.  Must already have been initialized by regdb_init()
 362  ***********************************************************************/
 363
 364 WERROR regdb_open( void )
 365 {
 366         WERROR result = WERR_OK;
 367
 368         if ( regdb ) {
 369                 DEBUG(10,("regdb_open: incrementing refcount (%d)\n", regdb_refcount));
 370                 regdb_refcount++;
 371                 return WERR_OK;
 372         }
 373
 374         become_root();
 375
 376         regdb = db_open(NULL, state_path("registry.tdb"), 0, REG_TDB_FLAGS, O_RDWR, 0600);
 377         if ( !regdb ) {
 378                 result = ntstatus_to_werror( map_nt_error_from_unix( errno ) );
 379                 DEBUG(0,("regdb_open: Failed to open %s! (%s)\n",
 380                         state_path("registry.tdb"), strerror(errno) ));
 381         }
 382
 383         unbecome_root();
 384
 385         regdb_refcount = 1;
 386         DEBUG(10,("regdb_open: refcount reset (%d)\n", regdb_refcount));
 387
 388         return result;
 389 }
 390
 391 /***********************************************************************
 392  ***********************************************************************/
 393
 394 int regdb_close( void )
 395 {
 396         if (regdb_refcount == 0) {
 397                 return 0;
 398         }
 399
 400         regdb_refcount--;
 401
 402         DEBUG(10,("regdb_close: decrementing refcount (%d)\n", regdb_refcount));
 403
 404         if ( regdb_refcount > 0 )
 405                 return 0;
 406
 407         SMB_ASSERT( regdb_refcount >= 0 );
 408
 409         TALLOC_FREE(regdb);
 410         return 0;
 411 }
 412
 413 /***********************************************************************
 414  return the tdb sequence number of the registry tdb.
 415  this is an indicator for the content of the registry
 416  having changed. it will change upon regdb_init, too, though.
 417  ***********************************************************************/
 418 int regdb_get_seqnum(void)
 419 {
 420         return regdb->get_seqnum(regdb);
 421 }
 422
 423 /***********************************************************************
 424  Add subkey strings to the registry tdb under a defined key
 425  fmt is the same format as tdb_pack except this function only supports
 426  fstrings
 427  ***********************************************************************/
 428
 429 static bool regdb_store_keys_internal(const char *key, REGSUBKEY_CTR *ctr)
 430 {
 431         TDB_DATA dbuf;
 432         uint8 *buffer = NULL;
 433         int i = 0;
 434         uint32 len, buflen;
 435         bool ret = true;
 436         uint32 num_subkeys = regsubkey_ctr_numkeys(ctr);
 437         char *keyname = NULL;
 438         TALLOC_CTX *ctx = talloc_stackframe();
 439         NTSTATUS status;
 440
 441         if (!key) {
 442                 return false;
 443         }
 444
 445         keyname = talloc_strdup(ctx, key);
 446         if (!keyname) {
 447                 return false;
 448         }
 449         keyname = normalize_reg_path(ctx, keyname);
 450
 451         /* allocate some initial memory */
 452
 453         buffer = (uint8 *)SMB_MALLOC(1024);
 454         if (buffer == NULL) {
 455                 return false;
 456         }
 457         buflen = 1024;
 458         len = 0;
 459
 460         /* store the number of subkeys */
 461
 462         len += tdb_pack(buffer+len, buflen-len, "d", num_subkeys);
 463
 464         /* pack all the strings */
 465
 466         for (i=0; i<num_subkeys; i++) {
 467                 len += tdb_pack(buffer+len, buflen-len, "f",
 468                                 regsubkey_ctr_specific_key(ctr, i));
 469                 if (len > buflen) {
 470                         /* allocate some extra space */
 471                         buffer = (uint8 *)SMB_REALLOC(buffer, len*2);
 472                         if(buffer == NULL) {
 473                                 DEBUG(0, ("regdb_store_keys: Failed to realloc "
 474                                           "memory of size [%d]\n", len*2));
 475                                 ret = false;
 476                                 goto done;
 477                         }
 478                         buflen = len*2;
 479                         len = tdb_pack(buffer+len, buflen-len, "f",
 480                                        regsubkey_ctr_specific_key(ctr, i));
 481                 }
 482         }
 483
 484         /* finally write out the data */
 485
 486         dbuf.dptr = buffer;
 487         dbuf.dsize = len;
 488         status = dbwrap_store_bystring(regdb, keyname, dbuf, TDB_REPLACE);
 489         if (!NT_STATUS_IS_OK(status)) {
 490                 ret = false;
 491                 goto done;
 492         }
 493
 494 done:
 495         TALLOC_FREE(ctx);
 496         SAFE_FREE(buffer);
 497         return ret;
 498 }
 499
 500 /***********************************************************************
 501  Store the new subkey record and create any child key records that
 502  do not currently exist
 503  ***********************************************************************/
 504
 505 bool regdb_store_keys(const char *key, REGSUBKEY_CTR *ctr)
 506 {
 507         int num_subkeys, i;
 508         char *path = NULL;
 509         REGSUBKEY_CTR *subkeys = NULL, *old_subkeys = NULL;
 510         char *oldkeyname = NULL;
 511         TALLOC_CTX *ctx = talloc_stackframe();
 512         NTSTATUS status;
 513
 514         /*
 515          * fetch a list of the old subkeys so we can determine if anything has
 516          * changed
 517          */
 518
 519         if (!(old_subkeys = TALLOC_ZERO_P(ctx, REGSUBKEY_CTR))) {
 520                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 521                 return false;
 522         }
 523
 524         regdb_fetch_keys(key, old_subkeys);
 525
 526         if ((ctr->num_subkeys && old_subkeys->num_subkeys) &&
 527             (ctr->num_subkeys == old_subkeys->num_subkeys)) {
 528
 529                 for (i = 0; i<ctr->num_subkeys; i++) {
 530                         if (strcmp(ctr->subkeys[i],
 531                                    old_subkeys->subkeys[i]) != 0) {
 532                                 break;
 533                         }
 534                 }
 535                 if (i == ctr->num_subkeys) {
 536                         /*
 537                          * Nothing changed, no point to even start a tdb
 538                          * transaction
 539                          */
 540                         TALLOC_FREE(old_subkeys);
 541                         return true;
 542                 }
 543         }
 544
 545         TALLOC_FREE(old_subkeys);
 546
 547         if (regdb->transaction_start(regdb) == -1) {
 548                 DEBUG(0, ("regdb_store_keys: transaction_start failed\n"));
 549                 goto fail;
 550         }
 551
 552         /*
 553          * Re-fetch the old keys inside the transaction
 554          */
 555
 556         if (!(old_subkeys = TALLOC_ZERO_P(ctx, REGSUBKEY_CTR))) {
 557                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 558                 goto cancel;
 559         }
 560
 561         regdb_fetch_keys(key, old_subkeys);
 562
 563         /* store the subkey list for the parent */
 564
 565         if (!regdb_store_keys_internal(key, ctr) ) {
 566                 DEBUG(0,("regdb_store_keys: Failed to store new subkey list "
 567                          "for parent [%s]\n", key));
 568                 goto cancel;
 569         }
 570
 571         /* now delete removed keys */
 572
 573         num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
 574         for (i=0; i<num_subkeys; i++) {
 575                 oldkeyname = regsubkey_ctr_specific_key(old_subkeys, i);
 576
 577                 if (regsubkey_ctr_key_exists(ctr, oldkeyname)) {
 578                         /*
 579                          * It's still around, don't delete
 580                          */
 581
 582                         continue;
 583                 }
 584
 585                 path = talloc_asprintf(ctx, "%s/%s", key, oldkeyname);
 586                 if (!path) {
 587                         goto cancel;
 588                 }
 589                 path = normalize_reg_path(ctx, path);
 590                 if (!path) {
 591                         goto cancel;
 592                 }
 593                 status = dbwrap_delete_bystring(regdb, path);
 594                 if (!NT_STATUS_IS_OK(status)) {
 595                         DEBUG(1, ("Deleting %s failed\n", path));
 596                         goto cancel;
 597                 }
 598
 599                 TALLOC_FREE(path);
 600                 path = talloc_asprintf(ctx, "%s/%s/%s",
 601                                 REG_VALUE_PREFIX,
 602                                 key,
 603                                 oldkeyname );
 604                 if (!path) {
 605                         goto cancel;
 606                 }
 607                 path = normalize_reg_path(ctx, path);
 608                 if (!path) {
 609                         goto cancel;
 610                 }
 611
 612                 /*
 613                  * Ignore errors here, we might have no values around
 614                  */
 615                 dbwrap_delete_bystring(regdb, path);
 616                 TALLOC_FREE(path);
 617         }
 618
 619         TALLOC_FREE(old_subkeys);
 620
 621         /* now create records for any subkeys that don't already exist */
 622
 623         num_subkeys = regsubkey_ctr_numkeys(ctr);
 624
 625         if (num_subkeys == 0) {
 626                 if (!(subkeys = TALLOC_ZERO_P(ctx, REGSUBKEY_CTR)) ) {
 627                         DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 628                         goto cancel;
 629                 }
 630
 631                 if (!regdb_store_keys_internal(key, subkeys)) {
 632                         DEBUG(0,("regdb_store_keys: Failed to store "
 633                                  "new record for key [%s]\n", key));
 634                         goto cancel;
 635                 }
 636                 TALLOC_FREE(subkeys);
 637
 638         }
 639
 640         for (i=0; i<num_subkeys; i++) {
 641                 path = talloc_asprintf(ctx, "%s/%s",
 642                                         key,
 643                                         regsubkey_ctr_specific_key(ctr, i));
 644                 if (!path) {
 645                         goto cancel;
 646                 }
 647                 if (!(subkeys = TALLOC_ZERO_P(ctx, REGSUBKEY_CTR)) ) {
 648                         DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 649                         goto cancel;
 650                 }
 651
 652                 if (regdb_fetch_keys( path, subkeys ) == -1) {
 653                         /* create a record with 0 subkeys */
 654                         if (!regdb_store_keys_internal(path, subkeys)) {
 655                                 DEBUG(0,("regdb_store_keys: Failed to store "
 656                                          "new record for key [%s]\n", path));
 657                                 goto cancel;
 658                         }
 659                 }
 660
 661                 TALLOC_FREE(subkeys);
 662                 TALLOC_FREE(path);
 663         }
 664
 665         if (regdb->transaction_commit(regdb) == -1) {
 666                 DEBUG(0, ("regdb_store_keys: Could not commit transaction\n"));
 667                 goto fail;
 668         }
 669
 670         TALLOC_FREE(ctx);
 671         return true;
 672
 673 cancel:
 674         if (regdb->transaction_cancel(regdb) == -1) {
 675                 smb_panic("regdb_store_keys: transaction_cancel failed\n");
 676         }
 677
 678 fail:
 679         TALLOC_FREE(ctx);
 680
 681         return false;
 682 }
 683
 684
 685 /***********************************************************************
 686  Retrieve an array of strings containing subkeys.  Memory should be
 687  released by the caller.
 688  ***********************************************************************/
 689
 690 int regdb_fetch_keys(const char *key, REGSUBKEY_CTR *ctr)
 691 {
 692         char *path = NULL;
 693         uint32 num_items;
 694         uint8 *buf;
 695         uint32 buflen, len;
 696         int i;
 697         fstring subkeyname;
 698         int ret = -1;
 699         TALLOC_CTX *frame = talloc_stackframe();
 700         struct db_record *rec;
 701
 702         DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL"));
 703
 704         path = talloc_strdup(frame, key);
 705         if (!path) {
 706                 goto fail;
 707         }
 708
 709         /* convert to key format */
 710         path = talloc_string_sub(frame, path, "\\", "/");
 711         if (!path) {
 712                 goto fail;
 713         }
 714         strupper_m(path);
 715
 716         rec = regdb->fetch_locked(regdb, frame, string_term_tdb_data(path));
 717         if (rec == NULL) {
 718                 ret = 0;
 719                 goto fail;
 720         }
 721
 722         ctr->seqnum = regdb_get_seqnum();
 723
 724         buf = rec->value.dptr;
 725         buflen = rec->value.dsize;
 726
 727         if ( !buf ) {
 728                 DEBUG(5,("regdb_fetch_keys: tdb lookup failed to locate key [%s]\n", key));
 729                 goto fail;
 730         }
 731
 732         len = tdb_unpack( buf, buflen, "d", &num_items);
 733
 734         for (i=0; i<num_items; i++) {
 735                 len += tdb_unpack(buf+len, buflen-len, "f", subkeyname);
 736                 regsubkey_ctr_addkey(ctr, subkeyname);
 737         }
 738
 739         DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items));
 740
 741         ret = num_items;
 742  fail:
 743         TALLOC_FREE(frame);
 744         return ret;
 745 }
 746
 747 /****************************************************************************
 748  Unpack a list of registry values frem the TDB
 749  ***************************************************************************/
 750
 751 static int regdb_unpack_values(REGVAL_CTR *values, uint8 *buf, int buflen)
 752 {
 753         int             len = 0;
 754         uint32          type;
 755         fstring valuename;
 756         uint32          size;
 757         uint8           *data_p;
 758         uint32          num_values = 0;
 759         int             i;
 760
 761         /* loop and unpack the rest of the registry values */
 762
 763         len += tdb_unpack(buf+len, buflen-len, "d", &num_values);
 764
 765         for ( i=0; i<num_values; i++ ) {
 766                 /* unpack the next regval */
 767
 768                 type = REG_NONE;
 769                 size = 0;
 770                 data_p = NULL;
 771                 valuename[0] = '\0';
 772                 len += tdb_unpack(buf+len, buflen-len, "fdB",
 773                                   valuename,
 774                                   &type,
 775                                   &size,
 776                                   &data_p);
 777
 778                 /* add the new value. Paranoid protective code -- make sure data_p is valid */
 779
 780                 if (*valuename && size && data_p) {
 781                         regval_ctr_addvalue(values, valuename, type,
 782                                         (const char *)data_p, size);
 783                 }
 784                 SAFE_FREE(data_p); /* 'B' option to tdb_unpack does a malloc() */
 785
 786                 DEBUG(8,("specific: [%s], len: %d\n", valuename, size));
 787         }
 788
 789         return len;
 790 }
 791
 792 /****************************************************************************
 793  Pack all values in all printer keys
 794  ***************************************************************************/
 795
 796 static int regdb_pack_values(REGVAL_CTR *values, uint8 *buf, int buflen)
 797 {
 798         int             len = 0;
 799         int             i;
 800         REGISTRY_VALUE  *val;
 801         int             num_values;
 802
 803         if ( !values )
 804                 return 0;
 805
 806         num_values = regval_ctr_numvals( values );
 807
 808         /* pack the number of values first */
 809
 810         len += tdb_pack( buf+len, buflen-len, "d", num_values );
 811
 812         /* loop over all values */
 813
 814         for ( i=0; i<num_values; i++ ) {
 815                 val = regval_ctr_specific_value( values, i );
 816                 len += tdb_pack(buf+len, buflen-len, "fdB",
 817                                 regval_name(val),
 818                                 regval_type(val),
 819                                 regval_size(val),
 820                                 regval_data_p(val) );
 821         }
 822
 823         return len;
 824 }
 825
 826 /***********************************************************************
 827  Retrieve an array of strings containing subkeys.  Memory should be
 828  released by the caller.
 829  ***********************************************************************/
 830
 831 int regdb_fetch_values( const char* key, REGVAL_CTR *values )
 832 {
 833         char *keystr = NULL;
 834         TALLOC_CTX *ctx = talloc_stackframe();
 835         struct db_record *rec;
 836         int ret = 0;
 837
 838         DEBUG(10,("regdb_fetch_values: Looking for value of key [%s] \n", key));
 839
 840         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key);
 841         if (!keystr) {
 842                 return 0;
 843         }
 844         keystr = normalize_reg_path(ctx, keystr);
 845         if (!keystr) {
 846                 goto done;
 847         }
 848
 849         rec = regdb->fetch_locked(regdb, ctx, string_term_tdb_data(keystr));
 850         if (rec == NULL) {
 851                 goto done;
 852         }
 853
 854         values->seqnum = regdb_get_seqnum();
 855
 856         if (!rec->value.dptr) {
 857                 /* all keys have zero values by default */
 858                 goto done;
 859         }
 860
 861         regdb_unpack_values(values, rec->value.dptr, rec->value.dsize);
 862         ret = regval_ctr_numvals(values);
 863
 864 done:
 865         TALLOC_FREE(ctx);
 866         return ret;
 867 }
 868
 869 bool regdb_store_values( const char *key, REGVAL_CTR *values )
 870 {
 871         TDB_DATA old_data, data;
 872         char *keystr = NULL;
 873         TALLOC_CTX *ctx = talloc_stackframe();
 874         int len, ret;
 875         bool result = false;
 876
 877         DEBUG(10,("regdb_store_values: Looking for value of key [%s] \n", key));
 878
 879         ZERO_STRUCT(data);
 880
 881         len = regdb_pack_values(values, data.dptr, data.dsize);
 882         if (len <= 0) {
 883                 DEBUG(0,("regdb_store_values: unable to pack values. len <= 0\n"));
 884                 goto done;
 885         }
 886
 887         data.dptr = TALLOC_ARRAY(ctx, uint8, len);
 888         data.dsize = len;
 889
 890         len = regdb_pack_values(values, data.dptr, data.dsize);
 891
 892         SMB_ASSERT( len == data.dsize );
 893
 894         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key );
 895         if (!keystr) {
 896                 goto done;
 897         }
 898         keystr = normalize_reg_path(ctx, keystr);
 899         if (!keystr) {
 900                 goto done;
 901         }
 902
 903         old_data = dbwrap_fetch_bystring(regdb, ctx, keystr);
 904
 905         if ((old_data.dptr != NULL)
 906             && (old_data.dsize == data.dsize)
 907             && (memcmp(old_data.dptr, data.dptr, data.dsize) == 0))
 908         {
 909                 result = true;
 910                 goto done;
 911         }
 912
 913         ret = dbwrap_trans_store(regdb, string_term_tdb_data(keystr), data,
 914                                  TDB_REPLACE);
 915         result = (ret != -1);
 916
 917 done:
 918         TALLOC_FREE(ctx);
 919         return result;
 920 }
 921
 922 static WERROR regdb_get_secdesc(TALLOC_CTX *mem_ctx, const char *key,
 923                                 struct security_descriptor **psecdesc)
 924 {
 925         char *tdbkey;
 926         TDB_DATA data;
 927         NTSTATUS status;
 928         TALLOC_CTX *tmp_ctx = talloc_stackframe();
 929         WERROR err = WERR_OK;
 930
 931         DEBUG(10, ("regdb_get_secdesc: Getting secdesc of key [%s]\n", key));
 932
 933         tdbkey = talloc_asprintf(tmp_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
 934         if (tdbkey == NULL) {
 935                 err = WERR_NOMEM;
 936                 goto done;
 937         }
 938         normalize_dbkey(tdbkey);
 939
 940         data = dbwrap_fetch_bystring(regdb, tmp_ctx, tdbkey);
 941         if (data.dptr == NULL) {
 942                 err = WERR_BADFILE;
 943                 goto done;
 944         }
 945
 946         status = unmarshall_sec_desc(mem_ctx, (uint8 *)data.dptr, data.dsize,
 947                                      psecdesc);
 948
 949         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
 950                 err = WERR_NOMEM;
 951         } else if (!NT_STATUS_IS_OK(status)) {
 952                 err = WERR_REG_CORRUPT;
 953         }
 954
 955 done:
 956         TALLOC_FREE(tmp_ctx);
 957         return err;
 958 }
 959
 960 static WERROR regdb_set_secdesc(const char *key,
 961                                 struct security_descriptor *secdesc)
 962 {
 963         TALLOC_CTX *mem_ctx = talloc_stackframe();
 964         char *tdbkey;
 965         WERROR err = WERR_NOMEM;
 966         TDB_DATA tdbdata;
 967         int tdb_ret;
 968
 969         tdbkey = talloc_asprintf(mem_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
 970         if (tdbkey == NULL) {
 971                 goto done;
 972         }
 973         normalize_dbkey(tdbkey);
 974
 975         if (secdesc == NULL) {
 976                 /* assuming a delete */
 977                 tdb_ret = dbwrap_trans_delete(regdb,
 978                                               string_term_tdb_data(tdbkey));
 979                 if (tdb_ret == -1) {
 980                         err = ntstatus_to_werror(map_nt_error_from_unix(errno));
 981                 } else {
 982                         err = WERR_OK;
 983                 }
 984                 goto done;
 985         }
 986
 987         err = ntstatus_to_werror(marshall_sec_desc(mem_ctx, secdesc,
 988                                                    &tdbdata.dptr,
 989                                                    &tdbdata.dsize));
 990         if (!W_ERROR_IS_OK(err)) {
 991                 goto done;
 992         }
 993
 994         tdb_ret = dbwrap_trans_store(regdb, string_term_tdb_data(tdbkey),
 995                                      tdbdata, 0);
 996         if (tdb_ret == -1) {
 997                 err = ntstatus_to_werror(map_nt_error_from_unix(errno));
 998                 goto done;
 999         }
1000
1001  done:
1002         TALLOC_FREE(mem_ctx);
1003         return err;
1004 }
1005
1006 bool regdb_subkeys_need_update(REGSUBKEY_CTR *subkeys)
1007 {
1008         return (regdb_get_seqnum() != subkeys->seqnum);
1009 }
1010
1011 bool regdb_values_need_update(REGVAL_CTR *values)
1012 {
1013         return (regdb_get_seqnum() != values->seqnum);
1014 }
1015
1016 /*
1017  * Table of function pointers for default access
1018  */
1019
1020 REGISTRY_OPS regdb_ops = {
1021         .fetch_subkeys = regdb_fetch_keys,
1022         .fetch_values = regdb_fetch_values,
1023         .store_subkeys = regdb_store_keys,
1024         .store_values = regdb_store_values,
1025         .get_secdesc = regdb_get_secdesc,
1026         .set_secdesc = regdb_set_secdesc,
1027         .subkeys_need_update = regdb_subkeys_need_update,
1028         .values_need_update = regdb_values_need_update
1029 };