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 tdb_wrap *tdb_reg = NULL;
  28 static int tdb_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 ( tdb_transaction_start( tdb_reg->tdb ) == -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", builtin_registry_paths[i]));
 121
 122                 path = talloc_strdup(talloc_tos(), builtin_registry_paths[i]);
 123                 base = talloc_strdup(talloc_tos(), "");
 124                 if (!path || !base) {
 125                         goto fail;
 126                 }
 127                 p = path;
 128
 129                 while (next_token_talloc(talloc_tos(), &p, &keyname, "\\")) {
 130
 131                         /* build up the registry path from the components */
 132
 133                         if (*base) {
 134                                 base = talloc_asprintf(talloc_tos(), "%s\\", base);
 135                                 if (!base) {
 136                                         goto fail;
 137                                 }
 138                         }
 139                         base = talloc_asprintf_append(base, "%s", keyname);
 140                         if (!base) {
 141                                 goto fail;
 142                         }
 143
 144                         /* get the immediate subkeyname (if we have one ) */
 145
 146                         subkeyname = talloc_strdup(talloc_tos(), "");
 147                         if (!subkeyname) {
 148                                 goto fail;
 149                         }
 150                         if (*p) {
 151                                 remaining = talloc_strdup(talloc_tos(), p);
 152                                 if (!remaining) {
 153                                         goto fail;
 154                                 }
 155                                 p2 = remaining;
 156
 157                                 if (!next_token_talloc(talloc_tos(), &p2,
 158                                                         &subkeyname, "\\")) {
 159                                         subkeyname = talloc_strdup(talloc_tos(),p2);
 160                                         if (!subkeyname) {
 161                                                 goto fail;
 162                                         }
 163                                 }
 164                         }
 165
 166                         DEBUG(10,("init_registry_data: Storing key [%s] with subkey [%s]\n",
 167                                 base, *subkeyname ? subkeyname : "NULL"));
 168
 169                         /* we don't really care if the lookup succeeds or not since
 170                            we are about to update the record.  We just want any
 171                            subkeys already present */
 172
 173                         if ( !(subkeys = TALLOC_ZERO_P(talloc_tos(), REGSUBKEY_CTR )) ) {
 174                                 DEBUG(0,("talloc() failure!\n"));
 175                                 goto fail;
 176                         }
 177
 178                         regdb_fetch_keys(base, subkeys);
 179                         if (*subkeyname) {
 180                                 regsubkey_ctr_addkey( subkeys, subkeyname);
 181                         }
 182                         if (!regdb_store_keys( base, subkeys)) {
 183                                 goto fail;
 184                         }
 185                 }
 186
 187                 TALLOC_FREE(frame);
 188         }
 189
 190         /* loop over all of the predefined values and add each component */
 191
 192         for (i=0; builtin_registry_values[i].path != NULL; i++) {
 193
 194                 if (!(values = TALLOC_ZERO_P(talloc_tos(), REGVAL_CTR))) {
 195                         goto fail;
 196                 }
 197
 198                 regdb_fetch_values( builtin_registry_values[i].path, values);
 199
 200                 /* preserve existing values across restarts.  Only add new ones */
 201
 202                 if (!regval_ctr_key_exists(values, builtin_registry_values[i].valuename)) {
 203                         switch(builtin_registry_values[i].type) {
 204                         case REG_DWORD:
 205                                 regval_ctr_addvalue( values,
 206                                                      builtin_registry_values[i].valuename,
 207                                                      REG_DWORD,
 208                                                      (char*)&builtin_registry_values[i].data.dw_value,
 209                                                      sizeof(uint32) );
 210                                 break;
 211
 212                         case REG_SZ:
 213                                 init_unistr2( &data, builtin_registry_values[i].data.string, UNI_STR_TERMINATE);
 214                                 regval_ctr_addvalue( values,
 215                                                      builtin_registry_values[i].valuename,
 216                                                      REG_SZ,
 217                                                      (char*)data.buffer,
 218                                                      data.uni_str_len*sizeof(uint16) );
 219                                 break;
 220
 221                         default:
 222                                 DEBUG(0,("init_registry_data: invalid value type in builtin_registry_values [%d]\n",
 223                                         builtin_registry_values[i].type));
 224                         }
 225                         regdb_store_values( builtin_registry_values[i].path, values );
 226                 }
 227                 TALLOC_FREE( values );
 228         }
 229
 230         TALLOC_FREE(frame);
 231
 232         if (tdb_transaction_commit( tdb_reg->tdb ) == -1) {
 233                 DEBUG(0, ("init_registry_data: Could not commit "
 234                           "transaction\n"));
 235                 return false;
 236         }
 237
 238         return true;
 239
 240  fail:
 241
 242         TALLOC_FREE(frame);
 243
 244         if (tdb_transaction_cancel( tdb_reg->tdb ) == -1) {
 245                 smb_panic("init_registry_data: tdb_transaction_cancel "
 246                           "failed\n");
 247         }
 248
 249         return false;
 250 }
 251
 252 /***********************************************************************
 253  Open the registry database
 254  ***********************************************************************/
 255
 256 bool regdb_init( void )
 257 {
 258         const char *vstring = "INFO/version";
 259         uint32 vers_id;
 260
 261         if ( tdb_reg ) {
 262                 DEBUG(10,("regdb_init: incrementing refcount (%d)\n", tdb_refcount));
 263                 tdb_refcount++;
 264                 return true;
 265         }
 266
 267         if ( !(tdb_reg = tdb_wrap_open(NULL, state_path("registry.tdb"), 0, REG_TDB_FLAGS, O_RDWR, 0600)) )
 268         {
 269                 tdb_reg = tdb_wrap_open(NULL, state_path("registry.tdb"), 0, REG_TDB_FLAGS, O_RDWR|O_CREAT, 0600);
 270                 if ( !tdb_reg ) {
 271                         DEBUG(0,("regdb_init: Failed to open registry %s (%s)\n",
 272                                 state_path("registry.tdb"), strerror(errno) ));
 273                         return false;
 274                 }
 275
 276                 DEBUG(10,("regdb_init: Successfully created registry tdb\n"));
 277         }
 278
 279         tdb_refcount = 1;
 280
 281         vers_id = tdb_fetch_int32(tdb_reg->tdb, vstring);
 282
 283         if ( vers_id != REGVER_V1 ) {
 284                 /* any upgrade code here if needed */
 285                 DEBUG(10, ("regdb_init: got INFO/version = %d != %d\n",
 286                            vers_id, REGVER_V1));
 287         }
 288
 289         /* always setup the necessary keys and values */
 290
 291         if ( !init_registry_data() ) {
 292                 DEBUG(0,("regdb_init: Failed to initialize data in registry!\n"));
 293                 return false;
 294         }
 295
 296         return true;
 297 }
 298
 299 /***********************************************************************
 300  Open the registry.  Must already have been initialized by regdb_init()
 301  ***********************************************************************/
 302
 303 WERROR regdb_open( void )
 304 {
 305         WERROR result = WERR_OK;
 306
 307         if ( tdb_reg ) {
 308                 DEBUG(10,("regdb_open: incrementing refcount (%d)\n", tdb_refcount));
 309                 tdb_refcount++;
 310                 return WERR_OK;
 311         }
 312
 313         become_root();
 314
 315         tdb_reg = tdb_wrap_open(NULL, state_path("registry.tdb"), 0, REG_TDB_FLAGS, O_RDWR, 0600);
 316         if ( !tdb_reg ) {
 317                 result = ntstatus_to_werror( map_nt_error_from_unix( errno ) );
 318                 DEBUG(0,("regdb_open: Failed to open %s! (%s)\n",
 319                         state_path("registry.tdb"), strerror(errno) ));
 320         }
 321
 322         unbecome_root();
 323
 324         tdb_refcount = 1;
 325         DEBUG(10,("regdb_open: refcount reset (%d)\n", tdb_refcount));
 326
 327         return result;
 328 }
 329
 330 /***********************************************************************
 331  ***********************************************************************/
 332
 333 int regdb_close( void )
 334 {
 335         if (tdb_refcount == 0) {
 336                 return 0;
 337         }
 338
 339         tdb_refcount--;
 340
 341         DEBUG(10,("regdb_close: decrementing refcount (%d)\n", tdb_refcount));
 342
 343         if ( tdb_refcount > 0 )
 344                 return 0;
 345
 346         SMB_ASSERT( tdb_refcount >= 0 );
 347
 348         TALLOC_FREE(tdb_reg);
 349         return 0;
 350 }
 351
 352 /***********************************************************************
 353  return the tdb sequence number of the registry tdb.
 354  this is an indicator for the content of the registry
 355  having changed. it will change upon regdb_init, too, though.
 356  ***********************************************************************/
 357 int regdb_get_seqnum(void)
 358 {
 359         return tdb_get_seqnum(tdb_reg->tdb);
 360 }
 361
 362 /***********************************************************************
 363  Add subkey strings to the registry tdb under a defined key
 364  fmt is the same format as tdb_pack except this function only supports
 365  fstrings
 366  ***********************************************************************/
 367
 368 static bool regdb_store_keys_internal(const char *key, REGSUBKEY_CTR *ctr)
 369 {
 370         TDB_DATA dbuf;
 371         uint8 *buffer = NULL;
 372         int i = 0;
 373         uint32 len, buflen;
 374         bool ret = true;
 375         uint32 num_subkeys = regsubkey_ctr_numkeys(ctr);
 376         char *keyname = NULL;
 377         TALLOC_CTX *ctx = talloc_tos();
 378
 379         if (!key) {
 380                 return false;
 381         }
 382
 383         keyname = talloc_strdup(ctx, key);
 384         if (!keyname) {
 385                 return false;
 386         }
 387         keyname = normalize_reg_path(ctx, keyname);
 388
 389         /* allocate some initial memory */
 390
 391         if (!(buffer = (uint8 *)SMB_MALLOC(1024))) {
 392                 return false;
 393         }
 394         buflen = 1024;
 395         len = 0;
 396
 397         /* store the number of subkeys */
 398
 399         len += tdb_pack(buffer+len, buflen-len, "d", num_subkeys );
 400
 401         /* pack all the strings */
 402
 403         for (i=0; i<num_subkeys; i++) {
 404                 len += tdb_pack( buffer+len, buflen-len, "f", regsubkey_ctr_specific_key(ctr, i) );
 405                 if ( len > buflen ) {
 406                         /* allocate some extra space */
 407                         if ((buffer = (uint8 *)SMB_REALLOC( buffer, len*2 )) == NULL) {
 408                                 DEBUG(0,("regdb_store_keys: Failed to realloc memory of size [%d]\n", len*2));
 409                                 ret = false;
 410                                 goto done;
 411                         }
 412                         buflen = len*2;
 413
 414                         len = tdb_pack( buffer+len, buflen-len, "f", regsubkey_ctr_specific_key(ctr, i) );
 415                 }
 416         }
 417
 418         /* finally write out the data */
 419
 420         dbuf.dptr = buffer;
 421         dbuf.dsize = len;
 422         if ( tdb_store_bystring( tdb_reg->tdb, keyname, dbuf, TDB_REPLACE ) == -1) {
 423                 ret = false;
 424                 goto done;
 425         }
 426
 427 done:
 428         SAFE_FREE( buffer );
 429         return ret;
 430 }
 431
 432 /***********************************************************************
 433  Store the new subkey record and create any child key records that
 434  do not currently exist
 435  ***********************************************************************/
 436
 437 bool regdb_store_keys(const char *key, REGSUBKEY_CTR *ctr)
 438 {
 439         int num_subkeys, i;
 440         char *path = NULL;
 441         REGSUBKEY_CTR *subkeys = NULL, *old_subkeys = NULL;
 442         char *oldkeyname = NULL;
 443         TALLOC_CTX *ctx = talloc_tos();
 444
 445         /*
 446          * fetch a list of the old subkeys so we can determine if anything has
 447          * changed
 448          */
 449
 450         if (!(old_subkeys = TALLOC_ZERO_P(ctr, REGSUBKEY_CTR))) {
 451                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 452                 return false;
 453         }
 454
 455         regdb_fetch_keys(key, old_subkeys);
 456
 457         if (ctr->num_subkeys == old_subkeys->num_subkeys) {
 458
 459                 for (i = 0; i<ctr->num_subkeys; i++) {
 460                         if (strcmp(ctr->subkeys[i],
 461                                    old_subkeys->subkeys[i]) != 0) {
 462                                 break;
 463                         }
 464                 }
 465                 if (i == ctr->num_subkeys) {
 466                         /*
 467                          * Nothing changed, no point to even start a tdb
 468                          * transaction
 469                          */
 470                         TALLOC_FREE(old_subkeys);
 471                         return true;
 472                 }
 473         }
 474
 475         if (tdb_transaction_start( tdb_reg->tdb ) == -1) {
 476                 DEBUG(0, ("regdb_store_keys: tdb_transaction_start failed\n"));
 477                 return false;
 478         }
 479
 480         /*
 481          * Re-fetch the old keys inside the transaction
 482          */
 483
 484         TALLOC_FREE(old_subkeys);
 485
 486         if (!(old_subkeys = TALLOC_ZERO_P(ctr, REGSUBKEY_CTR))) {
 487                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 488                 goto fail;
 489         }
 490
 491         regdb_fetch_keys(key, old_subkeys);
 492
 493         /* store the subkey list for the parent */
 494
 495         if (!regdb_store_keys_internal(key, ctr) ) {
 496                 DEBUG(0,("regdb_store_keys: Failed to store new subkey list "
 497                          "for parent [%s]\n", key));
 498                 goto fail;
 499         }
 500
 501         /* now delete removed keys */
 502
 503         num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
 504         for (i=0; i<num_subkeys; i++) {
 505                 oldkeyname = regsubkey_ctr_specific_key(old_subkeys, i);
 506
 507                 if (regsubkey_ctr_key_exists(ctr, oldkeyname)) {
 508                         /*
 509                          * It's still around, don't delete
 510                          */
 511
 512                         continue;
 513                 }
 514
 515                 path = talloc_asprintf(ctx, "%s/%s", key, oldkeyname);
 516                 if (!path) {
 517                         goto fail;
 518                 }
 519                 path = normalize_reg_path(ctx, path);
 520                 if (!path) {
 521                         goto fail;
 522                 }
 523                 if (tdb_delete_bystring(tdb_reg->tdb, path) == -1) {
 524                         DEBUG(1, ("Deleting %s failed\n", path));
 525                         goto fail;
 526                 }
 527
 528                 TALLOC_FREE(path);
 529                 path = talloc_asprintf(ctx, "%s/%s/%s",
 530                                 REG_VALUE_PREFIX,
 531                                 key,
 532                                 oldkeyname );
 533                 if (!path) {
 534                         goto fail;
 535                 }
 536                 path = normalize_reg_path(ctx, path);
 537                 if (!path) {
 538                         goto fail;
 539                 }
 540
 541                 /*
 542                  * Ignore errors here, we might have no values around
 543                  */
 544                 tdb_delete_bystring( tdb_reg->tdb, path );
 545                 TALLOC_FREE(path);
 546         }
 547
 548         TALLOC_FREE(old_subkeys);
 549
 550         /* now create records for any subkeys that don't already exist */
 551
 552         num_subkeys = regsubkey_ctr_numkeys(ctr);
 553         for (i=0; i<num_subkeys; i++) {
 554                 path = talloc_asprintf(ctx, "%s/%s",
 555                                         key,
 556                                         regsubkey_ctr_specific_key(ctr, i));
 557                 if (!path) {
 558                         goto fail;
 559                 }
 560                 if (!(subkeys = TALLOC_ZERO_P(ctr, REGSUBKEY_CTR)) ) {
 561                         DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 562                         goto fail;
 563                 }
 564
 565                 if (regdb_fetch_keys( path, subkeys ) == -1) {
 566                         /* create a record with 0 subkeys */
 567                         if (!regdb_store_keys_internal(path, subkeys)) {
 568                                 DEBUG(0,("regdb_store_keys: Failed to store "
 569                                          "new record for key [%s]\n", path));
 570                                 goto fail;
 571                         }
 572                 }
 573
 574                 TALLOC_FREE(subkeys);
 575                 TALLOC_FREE(path);
 576         }
 577
 578         if (tdb_transaction_commit( tdb_reg->tdb ) == -1) {
 579                 DEBUG(0, ("regdb_store_keys: Could not commit transaction\n"));
 580                 return false;
 581         }
 582
 583         return true;
 584
 585  fail:
 586         TALLOC_FREE(old_subkeys);
 587         TALLOC_FREE(subkeys);
 588
 589         if (tdb_transaction_cancel(tdb_reg->tdb) == -1) {
 590                 smb_panic("regdb_store_keys: tdb_transaction_cancel failed\n");
 591         }
 592
 593         return false;
 594 }
 595
 596
 597 /***********************************************************************
 598  Retrieve an array of strings containing subkeys.  Memory should be
 599  released by the caller.
 600  ***********************************************************************/
 601
 602 int regdb_fetch_keys(const char *key, REGSUBKEY_CTR *ctr)
 603 {
 604         char *path = NULL;
 605         uint32 num_items;
 606         TDB_DATA dbuf;
 607         uint8 *buf;
 608         uint32 buflen, len;
 609         int i;
 610         fstring subkeyname;
 611         int ret = -1;
 612         TALLOC_CTX *frame = talloc_stackframe();
 613
 614         DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL"));
 615
 616         path = talloc_strdup(talloc_tos(), key);
 617         if (!path) {
 618                 goto fail;
 619         }
 620
 621         /* convert to key format */
 622         path = talloc_string_sub(talloc_tos(), path, "\\", "/");
 623         if (!path) {
 624                 goto fail;
 625         }
 626         strupper_m(path);
 627
 628         if (tdb_read_lock_bystring_with_timeout(tdb_reg->tdb, path, 10) == -1) {
 629                 return 0;
 630         }
 631
 632         dbuf = tdb_fetch_bystring(tdb_reg->tdb, path);
 633         ctr->seqnum = regdb_get_seqnum();
 634
 635         tdb_read_unlock_bystring(tdb_reg->tdb, path);
 636
 637
 638         buf = dbuf.dptr;
 639         buflen = dbuf.dsize;
 640
 641         if ( !buf ) {
 642                 DEBUG(5,("regdb_fetch_keys: tdb lookup failed to locate key [%s]\n", key));
 643                 goto fail;
 644         }
 645
 646         len = tdb_unpack( buf, buflen, "d", &num_items);
 647
 648         for (i=0; i<num_items; i++) {
 649                 len += tdb_unpack(buf+len, buflen-len, "f", subkeyname);
 650                 regsubkey_ctr_addkey(ctr, subkeyname);
 651         }
 652
 653         SAFE_FREE(dbuf.dptr);
 654
 655         DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items));
 656
 657         ret = num_items;
 658  fail:
 659         TALLOC_FREE(frame);
 660         return ret;
 661 }
 662
 663 /****************************************************************************
 664  Unpack a list of registry values frem the TDB
 665  ***************************************************************************/
 666
 667 static int regdb_unpack_values(REGVAL_CTR *values, uint8 *buf, int buflen)
 668 {
 669         int             len = 0;
 670         uint32          type;
 671         fstring valuename;
 672         uint32          size;
 673         uint8           *data_p;
 674         uint32          num_values = 0;
 675         int             i;
 676
 677         /* loop and unpack the rest of the registry values */
 678
 679         len += tdb_unpack(buf+len, buflen-len, "d", &num_values);
 680
 681         for ( i=0; i<num_values; i++ ) {
 682                 /* unpack the next regval */
 683
 684                 type = REG_NONE;
 685                 size = 0;
 686                 data_p = NULL;
 687                 valuename[0] = '\0';
 688                 len += tdb_unpack(buf+len, buflen-len, "fdB",
 689                                   valuename,
 690                                   &type,
 691                                   &size,
 692                                   &data_p);
 693
 694                 /* add the new value. Paranoid protective code -- make sure data_p is valid */
 695
 696                 if (*valuename && size && data_p) {
 697                         regval_ctr_addvalue(values, valuename, type,
 698                                         (const char *)data_p, size);
 699                 }
 700                 SAFE_FREE(data_p); /* 'B' option to tdb_unpack does a malloc() */
 701
 702                 DEBUG(8,("specific: [%s], len: %d\n", valuename, size));
 703         }
 704
 705         return len;
 706 }
 707
 708 /****************************************************************************
 709  Pack all values in all printer keys
 710  ***************************************************************************/
 711
 712 static int regdb_pack_values(REGVAL_CTR *values, uint8 *buf, int buflen)
 713 {
 714         int             len = 0;
 715         int             i;
 716         REGISTRY_VALUE  *val;
 717         int             num_values;
 718
 719         if ( !values )
 720                 return 0;
 721
 722         num_values = regval_ctr_numvals( values );
 723
 724         /* pack the number of values first */
 725
 726         len += tdb_pack( buf+len, buflen-len, "d", num_values );
 727
 728         /* loop over all values */
 729
 730         for ( i=0; i<num_values; i++ ) {
 731                 val = regval_ctr_specific_value( values, i );
 732                 len += tdb_pack(buf+len, buflen-len, "fdB",
 733                                 regval_name(val),
 734                                 regval_type(val),
 735                                 regval_size(val),
 736                                 regval_data_p(val) );
 737         }
 738
 739         return len;
 740 }
 741
 742 /***********************************************************************
 743  Retrieve an array of strings containing subkeys.  Memory should be
 744  released by the caller.
 745  ***********************************************************************/
 746
 747 int regdb_fetch_values( const char* key, REGVAL_CTR *values )
 748 {
 749         TDB_DATA data;
 750         char *keystr = NULL;
 751         TALLOC_CTX *ctx = talloc_tos();
 752
 753         DEBUG(10,("regdb_fetch_values: Looking for value of key [%s] \n", key));
 754
 755         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key);
 756         if (!keystr) {
 757                 return 0;
 758         }
 759         keystr = normalize_reg_path(ctx, keystr);
 760         if (!keystr) {
 761                 return 0;
 762         }
 763
 764         if (tdb_read_lock_bystring_with_timeout(tdb_reg->tdb, keystr, 10) == -1) {
 765                 return 0;
 766         }
 767
 768         data = tdb_fetch_bystring(tdb_reg->tdb, keystr);
 769         values->seqnum = regdb_get_seqnum();
 770
 771         tdb_read_unlock_bystring(tdb_reg->tdb, keystr);
 772
 773         if (!data.dptr) {
 774                 /* all keys have zero values by default */
 775                 return 0;
 776         }
 777
 778         regdb_unpack_values(values, data.dptr, data.dsize);
 779
 780         SAFE_FREE(data.dptr);
 781         return regval_ctr_numvals(values);
 782 }
 783
 784 bool regdb_store_values( const char *key, REGVAL_CTR *values )
 785 {
 786         TDB_DATA old_data, data;
 787         char *keystr = NULL;
 788         TALLOC_CTX *ctx = talloc_tos();
 789         int len, ret;
 790
 791         DEBUG(10,("regdb_store_values: Looking for value of key [%s] \n", key));
 792
 793         ZERO_STRUCT(data);
 794
 795         len = regdb_pack_values(values, data.dptr, data.dsize);
 796         if (len <= 0) {
 797                 DEBUG(0,("regdb_store_values: unable to pack values. len <= 0\n"));
 798                 return false;
 799         }
 800
 801         data.dptr = SMB_MALLOC_ARRAY( uint8, len );
 802         data.dsize = len;
 803
 804         len = regdb_pack_values(values, data.dptr, data.dsize);
 805
 806         SMB_ASSERT( len == data.dsize );
 807
 808         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key );
 809         if (!keystr) {
 810                 SAFE_FREE(data.dptr);
 811                 return false;
 812         }
 813         keystr = normalize_reg_path(ctx, keystr);
 814         if (!keystr) {
 815                 SAFE_FREE(data.dptr);
 816                 return false;
 817         }
 818
 819         old_data = tdb_fetch_bystring(tdb_reg->tdb, keystr);
 820
 821         if ((old_data.dptr != NULL)
 822             && (old_data.dsize == data.dsize)
 823             && (memcmp(old_data.dptr, data.dptr, data.dsize) == 0)) {
 824                 SAFE_FREE(old_data.dptr);
 825                 SAFE_FREE(data.dptr);
 826                 return true;
 827         }
 828
 829         ret = tdb_trans_store_bystring(tdb_reg->tdb, keystr, data, TDB_REPLACE);
 830
 831         SAFE_FREE( old_data.dptr );
 832         SAFE_FREE( data.dptr );
 833
 834         return ret != -1 ;
 835 }
 836
 837 static WERROR regdb_get_secdesc(TALLOC_CTX *mem_ctx, const char *key,
 838                                 struct security_descriptor **psecdesc)
 839 {
 840         char *tdbkey;
 841         TDB_DATA data;
 842         NTSTATUS status;
 843
 844         DEBUG(10, ("regdb_get_secdesc: Getting secdesc of key [%s]\n", key));
 845
 846         if (asprintf(&tdbkey, "%s/%s", REG_SECDESC_PREFIX, key) == -1) {
 847                 return WERR_NOMEM;
 848         }
 849         normalize_dbkey(tdbkey);
 850
 851         data = tdb_fetch_bystring(tdb_reg->tdb, tdbkey);
 852         SAFE_FREE(tdbkey);
 853
 854         if (data.dptr == NULL) {
 855                 return WERR_BADFILE;
 856         }
 857
 858         status = unmarshall_sec_desc(mem_ctx, (uint8 *)data.dptr, data.dsize,
 859                                      psecdesc);
 860
 861         SAFE_FREE(data.dptr);
 862
 863         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
 864                 return WERR_NOMEM;
 865         }
 866
 867         if (!NT_STATUS_IS_OK(status)) {
 868                 return WERR_REG_CORRUPT;
 869         }
 870
 871         return WERR_OK;
 872 }
 873
 874 static WERROR regdb_set_secdesc(const char *key,
 875                                 struct security_descriptor *secdesc)
 876 {
 877         prs_struct ps;
 878         TALLOC_CTX *mem_ctx;
 879         char *tdbkey;
 880         WERROR err = WERR_NOMEM;
 881         TDB_DATA tdbdata;
 882
 883         if (!(mem_ctx = talloc_init("regdb_set_secdesc"))) {
 884                 return WERR_NOMEM;
 885         }
 886
 887         ZERO_STRUCT(ps);
 888
 889         if (!(tdbkey = talloc_asprintf(mem_ctx, "%s/%s", REG_SECDESC_PREFIX,
 890                                        key))) {
 891                 goto done;
 892         }
 893         normalize_dbkey(tdbkey);
 894
 895         if (secdesc == NULL) {
 896                 /* assuming a delete */
 897                 int tdb_ret;
 898
 899                 tdb_ret = tdb_trans_delete(tdb_reg->tdb,
 900                                            string_term_tdb_data(tdbkey));
 901                 if (tdb_ret == -1) {
 902                         err = ntstatus_to_werror(map_nt_error_from_unix(errno));
 903                 } else {
 904                         err = WERR_OK;
 905                 }
 906
 907                 goto done;
 908         }
 909
 910         err = ntstatus_to_werror(marshall_sec_desc(mem_ctx, secdesc,
 911                                                    &tdbdata.dptr,
 912                                                    &tdbdata.dsize));
 913         if (!W_ERROR_IS_OK(err)) {
 914                 goto done;
 915         }
 916
 917         if (tdb_trans_store_bystring(tdb_reg->tdb, tdbkey, tdbdata, 0) == -1) {
 918                 err = ntstatus_to_werror(map_nt_error_from_unix(errno));
 919                 goto done;
 920         }
 921
 922  done:
 923         prs_mem_free(&ps);
 924         TALLOC_FREE(mem_ctx);
 925         return err;
 926 }
 927
 928 bool regdb_subkeys_need_update(REGSUBKEY_CTR *subkeys)
 929 {
 930         return (regdb_get_seqnum() != subkeys->seqnum);
 931 }
 932
 933 bool regdb_values_need_update(REGVAL_CTR *values)
 934 {
 935         return (regdb_get_seqnum() != values->seqnum);
 936 }
 937
 938 /*
 939  * Table of function pointers for default access
 940  */
 941
 942 REGISTRY_OPS regdb_ops = {
 943         regdb_fetch_keys,
 944         regdb_fetch_values,
 945         regdb_store_keys,
 946         regdb_store_values,
 947         NULL,
 948         regdb_get_secdesc,
 949         regdb_set_secdesc,
 950         regdb_subkeys_need_update,
 951         regdb_values_need_update
 952 };