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