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", 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 (regdb->transaction_commit(regdb) == -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 (regdb->transaction_cancel(regdb) == -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 ( regdb ) {
 262                 DEBUG(10,("regdb_init: incrementing refcount (%d)\n", regdb_refcount));
 263                 regdb_refcount++;
 264                 return true;
 265         }
 266
 267         if ( !(regdb = db_open(NULL, state_path("registry.tdb"), 0, REG_TDB_FLAGS, O_RDWR, 0600)) )
 268         {
 269                 regdb = db_open(NULL, state_path("registry.tdb"), 0, REG_TDB_FLAGS, O_RDWR|O_CREAT, 0600);
 270                 if ( !regdb ) {
 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         regdb_refcount = 1;
 280
 281         vers_id = dbwrap_fetch_int32(regdb, 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 ( regdb ) {
 308                 DEBUG(10,("regdb_open: incrementing refcount (%d)\n", regdb_refcount));
 309                 regdb_refcount++;
 310                 return WERR_OK;
 311         }
 312
 313         become_root();
 314
 315         regdb = db_open(NULL, state_path("registry.tdb"), 0, REG_TDB_FLAGS, O_RDWR, 0600);
 316         if ( !regdb ) {
 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         regdb_refcount = 1;
 325         DEBUG(10,("regdb_open: refcount reset (%d)\n", regdb_refcount));
 326
 327         return result;
 328 }
 329
 330 /***********************************************************************
 331  ***********************************************************************/
 332
 333 int regdb_close( void )
 334 {
 335         if (regdb_refcount == 0) {
 336                 return 0;
 337         }
 338
 339         regdb_refcount--;
 340
 341         DEBUG(10,("regdb_close: decrementing refcount (%d)\n", regdb_refcount));
 342
 343         if ( regdb_refcount > 0 )
 344                 return 0;
 345
 346         SMB_ASSERT( regdb_refcount >= 0 );
 347
 348         TALLOC_FREE(regdb);
 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 regdb->get_seqnum(regdb);
 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         NTSTATUS status;
 379
 380         if (!key) {
 381                 return false;
 382         }
 383
 384         keyname = talloc_strdup(ctx, key);
 385         if (!keyname) {
 386                 return false;
 387         }
 388         keyname = normalize_reg_path(ctx, keyname);
 389
 390         /* allocate some initial memory */
 391
 392         if (!(buffer = (uint8 *)SMB_MALLOC(1024))) {
 393                 return false;
 394         }
 395         buflen = 1024;
 396         len = 0;
 397
 398         /* store the number of subkeys */
 399
 400         len += tdb_pack(buffer+len, buflen-len, "d", num_subkeys );
 401
 402         /* pack all the strings */
 403
 404         for (i=0; i<num_subkeys; i++) {
 405                 len += tdb_pack( buffer+len, buflen-len, "f", regsubkey_ctr_specific_key(ctr, i) );
 406                 if ( len > buflen ) {
 407                         /* allocate some extra space */
 408                         if ((buffer = (uint8 *)SMB_REALLOC( buffer, len*2 )) == NULL) {
 409                                 DEBUG(0,("regdb_store_keys: Failed to realloc memory of size [%d]\n", len*2));
 410                                 ret = false;
 411                                 goto done;
 412                         }
 413                         buflen = len*2;
 414
 415                         len = tdb_pack( buffer+len, buflen-len, "f", regsubkey_ctr_specific_key(ctr, i) );
 416                 }
 417         }
 418
 419         /* finally write out the data */
 420
 421         dbuf.dptr = buffer;
 422         dbuf.dsize = len;
 423         status = dbwrap_store_bystring(regdb, keyname, dbuf, TDB_REPLACE);
 424         if (!NT_STATUS_IS_OK(status)) {
 425                 ret = false;
 426                 goto done;
 427         }
 428
 429 done:
 430         SAFE_FREE( buffer );
 431         return ret;
 432 }
 433
 434 /***********************************************************************
 435  Store the new subkey record and create any child key records that
 436  do not currently exist
 437  ***********************************************************************/
 438
 439 bool regdb_store_keys(const char *key, REGSUBKEY_CTR *ctr)
 440 {
 441         int num_subkeys, i;
 442         char *path = NULL;
 443         REGSUBKEY_CTR *subkeys = NULL, *old_subkeys = NULL;
 444         char *oldkeyname = NULL;
 445         TALLOC_CTX *ctx = talloc_tos();
 446         NTSTATUS status;
 447
 448         /*
 449          * fetch a list of the old subkeys so we can determine if anything has
 450          * changed
 451          */
 452
 453         if (!(old_subkeys = TALLOC_ZERO_P(ctr, REGSUBKEY_CTR))) {
 454                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 455                 return false;
 456         }
 457
 458         regdb_fetch_keys(key, old_subkeys);
 459
 460         if ((ctr->num_subkeys && old_subkeys->num_subkeys) &&
 461             (ctr->num_subkeys == old_subkeys->num_subkeys)) {
 462
 463                 for (i = 0; i<ctr->num_subkeys; i++) {
 464                         if (strcmp(ctr->subkeys[i],
 465                                    old_subkeys->subkeys[i]) != 0) {
 466                                 break;
 467                         }
 468                 }
 469                 if (i == ctr->num_subkeys) {
 470                         /*
 471                          * Nothing changed, no point to even start a tdb
 472                          * transaction
 473                          */
 474                         TALLOC_FREE(old_subkeys);
 475                         return true;
 476                 }
 477         }
 478
 479         if (regdb->transaction_start(regdb) == -1) {
 480                 DEBUG(0, ("regdb_store_keys: transaction_start failed\n"));
 481                 return false;
 482         }
 483
 484         /*
 485          * Re-fetch the old keys inside the transaction
 486          */
 487
 488         TALLOC_FREE(old_subkeys);
 489
 490         if (!(old_subkeys = TALLOC_ZERO_P(ctr, REGSUBKEY_CTR))) {
 491                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 492                 goto fail;
 493         }
 494
 495         regdb_fetch_keys(key, old_subkeys);
 496
 497         /* store the subkey list for the parent */
 498
 499         if (!regdb_store_keys_internal(key, ctr) ) {
 500                 DEBUG(0,("regdb_store_keys: Failed to store new subkey list "
 501                          "for parent [%s]\n", key));
 502                 goto fail;
 503         }
 504
 505         /* now delete removed keys */
 506
 507         num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
 508         for (i=0; i<num_subkeys; i++) {
 509                 oldkeyname = regsubkey_ctr_specific_key(old_subkeys, i);
 510
 511                 if (regsubkey_ctr_key_exists(ctr, oldkeyname)) {
 512                         /*
 513                          * It's still around, don't delete
 514                          */
 515
 516                         continue;
 517                 }
 518
 519                 path = talloc_asprintf(ctx, "%s/%s", key, oldkeyname);
 520                 if (!path) {
 521                         goto fail;
 522                 }
 523                 path = normalize_reg_path(ctx, path);
 524                 if (!path) {
 525                         goto fail;
 526                 }
 527                 status = dbwrap_delete_bystring(regdb, path);
 528                 if (!NT_STATUS_IS_OK(status)) {
 529                         DEBUG(1, ("Deleting %s failed\n", path));
 530                         goto fail;
 531                 }
 532
 533                 TALLOC_FREE(path);
 534                 path = talloc_asprintf(ctx, "%s/%s/%s",
 535                                 REG_VALUE_PREFIX,
 536                                 key,
 537                                 oldkeyname );
 538                 if (!path) {
 539                         goto fail;
 540                 }
 541                 path = normalize_reg_path(ctx, path);
 542                 if (!path) {
 543                         goto fail;
 544                 }
 545
 546                 /*
 547                  * Ignore errors here, we might have no values around
 548                  */
 549                 dbwrap_delete_bystring(regdb, path);
 550                 TALLOC_FREE(path);
 551         }
 552
 553         TALLOC_FREE(old_subkeys);
 554
 555         /* now create records for any subkeys that don't already exist */
 556
 557         num_subkeys = regsubkey_ctr_numkeys(ctr);
 558
 559         if (num_subkeys == 0) {
 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_store_keys_internal(key, subkeys)) {
 566                         DEBUG(0,("regdb_store_keys: Failed to store "
 567                                  "new record for key [%s]\n", key));
 568                         goto fail;
 569                 }
 570                 TALLOC_FREE(subkeys);
 571
 572         }
 573
 574         for (i=0; i<num_subkeys; i++) {
 575                 path = talloc_asprintf(ctx, "%s/%s",
 576                                         key,
 577                                         regsubkey_ctr_specific_key(ctr, i));
 578                 if (!path) {
 579                         goto fail;
 580                 }
 581                 if (!(subkeys = TALLOC_ZERO_P(ctr, REGSUBKEY_CTR)) ) {
 582                         DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 583                         goto fail;
 584                 }
 585
 586                 if (regdb_fetch_keys( path, subkeys ) == -1) {
 587                         /* create a record with 0 subkeys */
 588                         if (!regdb_store_keys_internal(path, subkeys)) {
 589                                 DEBUG(0,("regdb_store_keys: Failed to store "
 590                                          "new record for key [%s]\n", path));
 591                                 goto fail;
 592                         }
 593                 }
 594
 595                 TALLOC_FREE(subkeys);
 596                 TALLOC_FREE(path);
 597         }
 598
 599         if (regdb->transaction_commit(regdb) == -1) {
 600                 DEBUG(0, ("regdb_store_keys: Could not commit transaction\n"));
 601                 return false;
 602         }
 603
 604         return true;
 605
 606  fail:
 607         TALLOC_FREE(old_subkeys);
 608         TALLOC_FREE(subkeys);
 609
 610         if (regdb->transaction_cancel(regdb) == -1) {
 611                 smb_panic("regdb_store_keys: transaction_cancel failed\n");
 612         }
 613
 614         return false;
 615 }
 616
 617
 618 /***********************************************************************
 619  Retrieve an array of strings containing subkeys.  Memory should be
 620  released by the caller.
 621  ***********************************************************************/
 622
 623 int regdb_fetch_keys(const char *key, REGSUBKEY_CTR *ctr)
 624 {
 625         char *path = NULL;
 626         uint32 num_items;
 627         uint8 *buf;
 628         uint32 buflen, len;
 629         int i;
 630         fstring subkeyname;
 631         int ret = -1;
 632         TALLOC_CTX *frame = talloc_stackframe();
 633         struct db_record *rec;
 634
 635         DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL"));
 636
 637         path = talloc_strdup(talloc_tos(), key);
 638         if (!path) {
 639                 goto fail;
 640         }
 641
 642         /* convert to key format */
 643         path = talloc_string_sub(talloc_tos(), path, "\\", "/");
 644         if (!path) {
 645                 goto fail;
 646         }
 647         strupper_m(path);
 648
 649         rec = regdb->fetch_locked(regdb, frame, string_term_tdb_data(path));
 650         if (rec == NULL) {
 651                 return 0;
 652         }
 653
 654         ctr->seqnum = regdb_get_seqnum();
 655
 656         buf = rec->value.dptr;
 657         buflen = rec->value.dsize;
 658
 659         if ( !buf ) {
 660                 DEBUG(5,("regdb_fetch_keys: tdb lookup failed to locate key [%s]\n", key));
 661                 goto fail;
 662         }
 663
 664         len = tdb_unpack( buf, buflen, "d", &num_items);
 665
 666         for (i=0; i<num_items; i++) {
 667                 len += tdb_unpack(buf+len, buflen-len, "f", subkeyname);
 668                 regsubkey_ctr_addkey(ctr, subkeyname);
 669         }
 670
 671         DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items));
 672
 673         ret = num_items;
 674  fail:
 675         TALLOC_FREE(frame);
 676         return ret;
 677 }
 678
 679 /****************************************************************************
 680  Unpack a list of registry values frem the TDB
 681  ***************************************************************************/
 682
 683 static int regdb_unpack_values(REGVAL_CTR *values, uint8 *buf, int buflen)
 684 {
 685         int             len = 0;
 686         uint32          type;
 687         fstring valuename;
 688         uint32          size;
 689         uint8           *data_p;
 690         uint32          num_values = 0;
 691         int             i;
 692
 693         /* loop and unpack the rest of the registry values */
 694
 695         len += tdb_unpack(buf+len, buflen-len, "d", &num_values);
 696
 697         for ( i=0; i<num_values; i++ ) {
 698                 /* unpack the next regval */
 699
 700                 type = REG_NONE;
 701                 size = 0;
 702                 data_p = NULL;
 703                 valuename[0] = '\0';
 704                 len += tdb_unpack(buf+len, buflen-len, "fdB",
 705                                   valuename,
 706                                   &type,
 707                                   &size,
 708                                   &data_p);
 709
 710                 /* add the new value. Paranoid protective code -- make sure data_p is valid */
 711
 712                 if (*valuename && size && data_p) {
 713                         regval_ctr_addvalue(values, valuename, type,
 714                                         (const char *)data_p, size);
 715                 }
 716                 SAFE_FREE(data_p); /* 'B' option to tdb_unpack does a malloc() */
 717
 718                 DEBUG(8,("specific: [%s], len: %d\n", valuename, size));
 719         }
 720
 721         return len;
 722 }
 723
 724 /****************************************************************************
 725  Pack all values in all printer keys
 726  ***************************************************************************/
 727
 728 static int regdb_pack_values(REGVAL_CTR *values, uint8 *buf, int buflen)
 729 {
 730         int             len = 0;
 731         int             i;
 732         REGISTRY_VALUE  *val;
 733         int             num_values;
 734
 735         if ( !values )
 736                 return 0;
 737
 738         num_values = regval_ctr_numvals( values );
 739
 740         /* pack the number of values first */
 741
 742         len += tdb_pack( buf+len, buflen-len, "d", num_values );
 743
 744         /* loop over all values */
 745
 746         for ( i=0; i<num_values; i++ ) {
 747                 val = regval_ctr_specific_value( values, i );
 748                 len += tdb_pack(buf+len, buflen-len, "fdB",
 749                                 regval_name(val),
 750                                 regval_type(val),
 751                                 regval_size(val),
 752                                 regval_data_p(val) );
 753         }
 754
 755         return len;
 756 }
 757
 758 /***********************************************************************
 759  Retrieve an array of strings containing subkeys.  Memory should be
 760  released by the caller.
 761  ***********************************************************************/
 762
 763 int regdb_fetch_values( const char* key, REGVAL_CTR *values )
 764 {
 765         char *keystr = NULL;
 766         TALLOC_CTX *ctx = talloc_stackframe();
 767         struct db_record *rec;
 768         int ret = 0;
 769
 770         DEBUG(10,("regdb_fetch_values: Looking for value of key [%s] \n", key));
 771
 772         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key);
 773         if (!keystr) {
 774                 return 0;
 775         }
 776         keystr = normalize_reg_path(ctx, keystr);
 777         if (!keystr) {
 778                 goto done;
 779         }
 780
 781         rec = regdb->fetch_locked(regdb, ctx, string_term_tdb_data(keystr));
 782         if (rec == NULL) {
 783                 goto done;
 784         }
 785
 786         values->seqnum = regdb_get_seqnum();
 787
 788         if (!rec->value.dptr) {
 789                 /* all keys have zero values by default */
 790                 goto done;
 791         }
 792
 793         regdb_unpack_values(values, rec->value.dptr, rec->value.dsize);
 794         ret = regval_ctr_numvals(values);
 795
 796 done:
 797         TALLOC_FREE(ctx);
 798         return ret;
 799 }
 800
 801 bool regdb_store_values( const char *key, REGVAL_CTR *values )
 802 {
 803         TDB_DATA old_data, data;
 804         char *keystr = NULL;
 805         TALLOC_CTX *ctx = talloc_tos();
 806         int len, ret;
 807
 808         DEBUG(10,("regdb_store_values: Looking for value of key [%s] \n", key));
 809
 810         ZERO_STRUCT(data);
 811
 812         len = regdb_pack_values(values, data.dptr, data.dsize);
 813         if (len <= 0) {
 814                 DEBUG(0,("regdb_store_values: unable to pack values. len <= 0\n"));
 815                 return false;
 816         }
 817
 818         data.dptr = SMB_MALLOC_ARRAY( uint8, len );
 819         data.dsize = len;
 820
 821         len = regdb_pack_values(values, data.dptr, data.dsize);
 822
 823         SMB_ASSERT( len == data.dsize );
 824
 825         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key );
 826         if (!keystr) {
 827                 SAFE_FREE(data.dptr);
 828                 return false;
 829         }
 830         keystr = normalize_reg_path(ctx, keystr);
 831         if (!keystr) {
 832                 SAFE_FREE(data.dptr);
 833                 return false;
 834         }
 835
 836         old_data = dbwrap_fetch_bystring(regdb, ctx, keystr);
 837
 838         if ((old_data.dptr != NULL)
 839             && (old_data.dsize == data.dsize)
 840             && (memcmp(old_data.dptr, data.dptr, data.dsize) == 0)) {
 841                 TALLOC_FREE(old_data.dptr);
 842                 SAFE_FREE(data.dptr);
 843                 return true;
 844         }
 845
 846         ret = dbwrap_trans_store(regdb, string_term_tdb_data(keystr), data,
 847                                  TDB_REPLACE);
 848
 849         TALLOC_FREE( old_data.dptr );
 850         SAFE_FREE( data.dptr );
 851
 852         return ret != -1 ;
 853 }
 854
 855 static WERROR regdb_get_secdesc(TALLOC_CTX *mem_ctx, const char *key,
 856                                 struct security_descriptor **psecdesc)
 857 {
 858         char *tdbkey;
 859         TDB_DATA data;
 860         NTSTATUS status;
 861         TALLOC_CTX *tmp_ctx = talloc_stackframe();
 862
 863         DEBUG(10, ("regdb_get_secdesc: Getting secdesc of key [%s]\n", key));
 864
 865         if (asprintf(&tdbkey, "%s/%s", REG_SECDESC_PREFIX, key) == -1) {
 866                 return WERR_NOMEM;
 867         }
 868         normalize_dbkey(tdbkey);
 869
 870         data = dbwrap_fetch_bystring(regdb, tmp_ctx, tdbkey);
 871         SAFE_FREE(tdbkey);
 872
 873         if (data.dptr == NULL) {
 874                 return WERR_BADFILE;
 875         }
 876
 877         status = unmarshall_sec_desc(mem_ctx, (uint8 *)data.dptr, data.dsize,
 878                                      psecdesc);
 879
 880         TALLOC_FREE(tmp_ctx);
 881
 882         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
 883                 return WERR_NOMEM;
 884         }
 885
 886         if (!NT_STATUS_IS_OK(status)) {
 887                 return WERR_REG_CORRUPT;
 888         }
 889
 890         return WERR_OK;
 891 }
 892
 893 static WERROR regdb_set_secdesc(const char *key,
 894                                 struct security_descriptor *secdesc)
 895 {
 896         prs_struct ps;
 897         TALLOC_CTX *mem_ctx;
 898         char *tdbkey;
 899         WERROR err = WERR_NOMEM;
 900         TDB_DATA tdbdata;
 901
 902         if (!(mem_ctx = talloc_init("regdb_set_secdesc"))) {
 903                 return WERR_NOMEM;
 904         }
 905
 906         ZERO_STRUCT(ps);
 907
 908         if (!(tdbkey = talloc_asprintf(mem_ctx, "%s/%s", REG_SECDESC_PREFIX,
 909                                        key))) {
 910                 goto done;
 911         }
 912         normalize_dbkey(tdbkey);
 913
 914         if (secdesc == NULL) {
 915                 /* assuming a delete */
 916                 int tdb_ret;
 917
 918                 tdb_ret = dbwrap_trans_delete(regdb,
 919                                               string_term_tdb_data(tdbkey));
 920                 if (tdb_ret == -1) {
 921                         err = ntstatus_to_werror(map_nt_error_from_unix(errno));
 922                 } else {
 923                         err = WERR_OK;
 924                 }
 925
 926                 goto done;
 927         }
 928
 929         err = ntstatus_to_werror(marshall_sec_desc(mem_ctx, secdesc,
 930                                                    &tdbdata.dptr,
 931                                                    &tdbdata.dsize));
 932         if (!W_ERROR_IS_OK(err)) {
 933                 goto done;
 934         }
 935
 936         if (dbwrap_trans_store(regdb, string_term_tdb_data(tdbkey),
 937                                tdbdata, 0) == -1) {
 938                 err = ntstatus_to_werror(map_nt_error_from_unix(errno));
 939                 goto done;
 940         }
 941
 942  done:
 943         prs_mem_free(&ps);
 944         TALLOC_FREE(mem_ctx);
 945         return err;
 946 }
 947
 948 bool regdb_subkeys_need_update(REGSUBKEY_CTR *subkeys)
 949 {
 950         return (regdb_get_seqnum() != subkeys->seqnum);
 951 }
 952
 953 bool regdb_values_need_update(REGVAL_CTR *values)
 954 {
 955         return (regdb_get_seqnum() != values->seqnum);
 956 }
 957
 958 /*
 959  * Table of function pointers for default access
 960  */
 961
 962 REGISTRY_OPS regdb_ops = {
 963         regdb_fetch_keys,
 964         regdb_fetch_values,
 965         regdb_store_keys,
 966         regdb_store_values,
 967         NULL,
 968         regdb_get_secdesc,
 969         regdb_set_secdesc,
 970         regdb_subkeys_need_update,
 971         regdb_values_need_update
 972 };