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 static bool regdb_key_exists(struct db_context *db, const char *key);
  31 static bool regdb_key_is_base_key(const char *key);
  32 static int regdb_fetch_keys_internal(struct db_context *db, const char *key,
  33                                      struct regsubkey_ctr *ctr);
  34 static bool regdb_store_keys_internal(struct db_context *db, const char *key,
  35                                       struct regsubkey_ctr *ctr);
  36 static int regdb_fetch_values_internal(struct db_context *db, const char* key,
  37                                        struct regval_ctr *values);
  38
  39 /* List the deepest path into the registry.  All part components will be created.*/
  40
  41 /* If you want to have a part of the path controlled by the tdb and part by
  42    a virtual registry db (e.g. printing), then you have to list the deepest path.
  43    For example,"HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion/Print"
  44    allows the reg_db backend to handle everything up to
  45    "HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion" and then we'll hook
  46    the reg_printing backend onto the last component of the path (see
  47    KEY_PRINTING_2K in include/rpc_reg.h)   --jerry */
  48
  49 static const char *builtin_registry_paths[] = {
  50         KEY_PRINTING_2K,
  51         KEY_PRINTING_PORTS,
  52         KEY_PRINTING,
  53         KEY_SHARES,
  54         KEY_EVENTLOG,
  55         KEY_SMBCONF,
  56         KEY_PERFLIB,
  57         KEY_PERFLIB_009,
  58         KEY_GROUP_POLICY,
  59         KEY_SAMBA_GROUP_POLICY,
  60         KEY_GP_MACHINE_POLICY,
  61         KEY_GP_MACHINE_WIN_POLICY,
  62         KEY_HKCU,
  63         KEY_GP_USER_POLICY,
  64         KEY_GP_USER_WIN_POLICY,
  65         KEY_WINLOGON_GPEXT_PATH,
  66         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Print\\Monitors",
  67         KEY_PROD_OPTIONS,
  68         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Terminal Server\\DefaultUserConfiguration",
  69         KEY_TCPIP_PARAMS,
  70         KEY_NETLOGON_PARAMS,
  71         KEY_HKU,
  72         KEY_HKCR,
  73         KEY_HKPD,
  74         KEY_HKPT,
  75          NULL };
  76
  77 struct builtin_regkey_value {
  78         const char *path;
  79         const char *valuename;
  80         uint32 type;
  81         union {
  82                 const char *string;
  83                 uint32 dw_value;
  84         } data;
  85 };
  86
  87 static struct builtin_regkey_value builtin_registry_values[] = {
  88         { KEY_PRINTING_PORTS,
  89                 SAMBA_PRINTER_PORT_NAME, REG_SZ, { "" } },
  90         { KEY_PRINTING_2K,
  91                 "DefaultSpoolDirectory", REG_SZ, { "C:\\Windows\\System32\\Spool\\Printers" } },
  92         { KEY_EVENTLOG,
  93                 "DisplayName", REG_SZ, { "Event Log" } },
  94         { KEY_EVENTLOG,
  95                 "ErrorControl", REG_DWORD, { (char*)0x00000001 } },
  96         { NULL, NULL, 0, { NULL } }
  97 };
  98
  99 /**
 100  * Initialize a key in the registry:
 101  * create each component key of the specified path.
 102  */
 103 static WERROR init_registry_key_internal(struct db_context *db,
 104                                          const char *add_path)
 105 {
 106         WERROR werr;
 107         TALLOC_CTX *frame = talloc_stackframe();
 108         char *path = NULL;
 109         char *base = NULL;
 110         char *remaining = NULL;
 111         char *keyname;
 112         char *subkeyname;
 113         struct regsubkey_ctr *subkeys;
 114         const char *p, *p2;
 115
 116         DEBUG(6, ("init_registry_key: Adding [%s]\n", add_path));
 117
 118         path = talloc_strdup(frame, add_path);
 119         base = talloc_strdup(frame, "");
 120         if (!path || !base) {
 121                 werr = WERR_NOMEM;
 122                 goto fail;
 123         }
 124         p = path;
 125
 126         while (next_token_talloc(frame, &p, &keyname, "\\")) {
 127
 128                 /* build up the registry path from the components */
 129
 130                 if (*base) {
 131                         base = talloc_asprintf(frame, "%s\\", base);
 132                         if (!base) {
 133                                 werr = WERR_NOMEM;
 134                                 goto fail;
 135                         }
 136                 }
 137                 base = talloc_asprintf_append(base, "%s", keyname);
 138                 if (!base) {
 139                         werr = WERR_NOMEM;
 140                         goto fail;
 141                 }
 142
 143                 /* get the immediate subkeyname (if we have one ) */
 144
 145                 subkeyname = talloc_strdup(frame, "");
 146                 if (!subkeyname) {
 147                         werr = WERR_NOMEM;
 148                         goto fail;
 149                 }
 150                 if (*p) {
 151                         remaining = talloc_strdup(frame, p);
 152                         if (!remaining) {
 153                                 werr = WERR_NOMEM;
 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                                         werr = WERR_NOMEM;
 164                                         goto fail;
 165                                 }
 166                         }
 167                 }
 168
 169                 DEBUG(10,("init_registry_key: Storing key [%s] with "
 170                           "subkey [%s]\n", base,
 171                           *subkeyname ? subkeyname : "NULL"));
 172
 173                 /* we don't really care if the lookup succeeds or not
 174                  * since we are about to update the record.
 175                  * We just want any subkeys already present */
 176
 177                 werr = regsubkey_ctr_init(frame, &subkeys);
 178                 if (!W_ERROR_IS_OK(werr)) {
 179                         DEBUG(0,("talloc() failure!\n"));
 180                         goto fail;
 181                 }
 182
 183                 regdb_fetch_keys_internal(db, base, subkeys);
 184                 if (*subkeyname) {
 185                         werr = regsubkey_ctr_addkey(subkeys, subkeyname);
 186                         if (!W_ERROR_IS_OK(werr)) {
 187                                 goto fail;
 188                         }
 189                 }
 190                 if (!regdb_store_keys_internal(db, base, subkeys)) {
 191                         werr = WERR_CAN_NOT_COMPLETE;
 192                         goto fail;
 193                 }
 194         }
 195
 196         werr = WERR_OK;
 197
 198 fail:
 199         TALLOC_FREE(frame);
 200         return werr;
 201 }
 202
 203 struct init_registry_key_context {
 204         const char *add_path;
 205 };
 206
 207 static NTSTATUS init_registry_key_action(struct db_context *db,
 208                                          void *private_data)
 209 {
 210         struct init_registry_key_context *init_ctx =
 211                 (struct init_registry_key_context *)private_data;
 212
 213         return werror_to_ntstatus(init_registry_key_internal(
 214                                         db, init_ctx->add_path));
 215 }
 216
 217 /**
 218  * Initialize a key in the registry:
 219  * create each component key of the specified path,
 220  * wrapped in one db transaction.
 221  */
 222 WERROR init_registry_key(const char *add_path)
 223 {
 224         struct init_registry_key_context init_ctx;
 225
 226         if (regdb_key_exists(regdb, add_path)) {
 227                 return WERR_OK;
 228         }
 229
 230         init_ctx.add_path = add_path;
 231
 232         return ntstatus_to_werror(dbwrap_trans_do(regdb,
 233                                                   init_registry_key_action,
 234                                                   &init_ctx));
 235 }
 236
 237 /***********************************************************************
 238  Open the registry data in the tdb
 239  ***********************************************************************/
 240
 241 WERROR init_registry_data(void)
 242 {
 243         WERROR werr;
 244         TALLOC_CTX *frame = talloc_stackframe();
 245         struct regval_ctr *values;
 246         int i;
 247         UNISTR2 data;
 248
 249         /*
 250          * First, check for the existence of the needed keys and values.
 251          * If all do already exist, we can save the writes.
 252          */
 253         for (i=0; builtin_registry_paths[i] != NULL; i++) {
 254                 if (!regdb_key_exists(regdb, builtin_registry_paths[i])) {
 255                         goto do_init;
 256                 }
 257         }
 258
 259         for (i=0; builtin_registry_values[i].path != NULL; i++) {
 260                 values = TALLOC_ZERO_P(frame, struct regval_ctr);
 261                 if (values == NULL) {
 262                         werr = WERR_NOMEM;
 263                         goto done;
 264                 }
 265
 266                 regdb_fetch_values_internal(regdb,
 267                                             builtin_registry_values[i].path,
 268                                             values);
 269                 if (!regval_ctr_key_exists(values,
 270                                         builtin_registry_values[i].valuename))
 271                 {
 272                         TALLOC_FREE(values);
 273                         goto do_init;
 274                 }
 275
 276                 TALLOC_FREE(values);
 277         }
 278
 279         werr = WERR_OK;
 280         goto done;
 281
 282 do_init:
 283
 284         /*
 285          * There are potentially quite a few store operations which are all
 286          * indiviually wrapped in tdb transactions. Wrapping them in a single
 287          * transaction gives just a single transaction_commit() to actually do
 288          * its fsync()s. See tdb/common/transaction.c for info about nested
 289          * transaction behaviour.
 290          */
 291
 292         if (regdb->transaction_start(regdb) != 0) {
 293                 DEBUG(0, ("init_registry_data: tdb_transaction_start "
 294                           "failed\n"));
 295                 werr = WERR_REG_IO_FAILURE;
 296                 goto done;
 297         }
 298
 299         /* loop over all of the predefined paths and add each component */
 300
 301         for (i=0; builtin_registry_paths[i] != NULL; i++) {
 302                 if (regdb_key_exists(regdb, builtin_registry_paths[i])) {
 303                         continue;
 304                 }
 305                 werr = init_registry_key_internal(regdb,
 306                                                   builtin_registry_paths[i]);
 307                 if (!W_ERROR_IS_OK(werr)) {
 308                         goto fail;
 309                 }
 310         }
 311
 312         /* loop over all of the predefined values and add each component */
 313
 314         for (i=0; builtin_registry_values[i].path != NULL; i++) {
 315
 316                 values = TALLOC_ZERO_P(frame, struct regval_ctr);
 317                 if (values == NULL) {
 318                         werr = WERR_NOMEM;
 319                         goto fail;
 320                 }
 321
 322                 regdb_fetch_values_internal(regdb,
 323                                             builtin_registry_values[i].path,
 324                                             values);
 325
 326                 /* preserve existing values across restarts. Only add new ones */
 327
 328                 if (!regval_ctr_key_exists(values,
 329                                         builtin_registry_values[i].valuename))
 330                 {
 331                         switch(builtin_registry_values[i].type) {
 332                         case REG_DWORD:
 333                                 regval_ctr_addvalue(values,
 334                                         builtin_registry_values[i].valuename,
 335                                         REG_DWORD,
 336                                         (char*)&builtin_registry_values[i].data.dw_value,
 337                                         sizeof(uint32));
 338                                 break;
 339
 340                         case REG_SZ:
 341                                 init_unistr2(&data,
 342                                         builtin_registry_values[i].data.string,
 343                                         UNI_STR_TERMINATE);
 344                                 regval_ctr_addvalue(values,
 345                                         builtin_registry_values[i].valuename,
 346                                         REG_SZ,
 347                                         (char*)data.buffer,
 348                                         data.uni_str_len*sizeof(uint16));
 349                                 break;
 350
 351                         default:
 352                                 DEBUG(0, ("init_registry_data: invalid value "
 353                                           "type in builtin_registry_values "
 354                                           "[%d]\n",
 355                                           builtin_registry_values[i].type));
 356                         }
 357                         regdb_store_values(builtin_registry_values[i].path,
 358                                            values);
 359                 }
 360                 TALLOC_FREE(values);
 361         }
 362
 363         if (regdb->transaction_commit(regdb) != 0) {
 364                 DEBUG(0, ("init_registry_data: Could not commit "
 365                           "transaction\n"));
 366                 werr = WERR_REG_IO_FAILURE;
 367         } else {
 368                 werr = WERR_OK;
 369         }
 370
 371         goto done;
 372
 373 fail:
 374         if (regdb->transaction_cancel(regdb) != 0) {
 375                 smb_panic("init_registry_data: tdb_transaction_cancel "
 376                           "failed\n");
 377         }
 378
 379 done:
 380         TALLOC_FREE(frame);
 381         return werr;
 382 }
 383
 384 /***********************************************************************
 385  Open the registry database
 386  ***********************************************************************/
 387
 388 WERROR regdb_init(void)
 389 {
 390         const char *vstring = "INFO/version";
 391         uint32 vers_id;
 392         WERROR werr;
 393
 394         if (regdb) {
 395                 DEBUG(10, ("regdb_init: incrementing refcount (%d)\n",
 396                           regdb_refcount));
 397                 regdb_refcount++;
 398                 return WERR_OK;
 399         }
 400
 401         regdb = db_open(NULL, state_path("registry.tdb"), 0,
 402                               REG_TDB_FLAGS, O_RDWR, 0600);
 403         if (!regdb) {
 404                 regdb = db_open(NULL, state_path("registry.tdb"), 0,
 405                                       REG_TDB_FLAGS, O_RDWR|O_CREAT, 0600);
 406                 if (!regdb) {
 407                         werr = ntstatus_to_werror(map_nt_error_from_unix(errno));
 408                         DEBUG(1,("regdb_init: Failed to open registry %s (%s)\n",
 409                                 state_path("registry.tdb"), strerror(errno) ));
 410                         return werr;
 411                 }
 412
 413                 DEBUG(10,("regdb_init: Successfully created registry tdb\n"));
 414         }
 415
 416         regdb_refcount = 1;
 417
 418         vers_id = dbwrap_fetch_int32(regdb, vstring);
 419
 420         if ( vers_id != REGVER_V1 ) {
 421                 NTSTATUS status;
 422                 /* any upgrade code here if needed */
 423                 DEBUG(10, ("regdb_init: got %s = %d != %d\n", vstring,
 424                            vers_id, REGVER_V1));
 425                 status = dbwrap_trans_store_int32(regdb, vstring, REGVER_V1);
 426                 if (!NT_STATUS_IS_OK(status)) {
 427                         DEBUG(1, ("regdb_init: error storing %s = %d: %s\n",
 428                                   vstring, REGVER_V1, nt_errstr(status)));
 429                         return ntstatus_to_werror(status);
 430                 } else {
 431                         DEBUG(10, ("regdb_init: stored %s = %d\n",
 432                                   vstring, REGVER_V1));
 433                 }
 434         }
 435
 436         return WERR_OK;
 437 }
 438
 439 /***********************************************************************
 440  Open the registry.  Must already have been initialized by regdb_init()
 441  ***********************************************************************/
 442
 443 WERROR regdb_open( void )
 444 {
 445         WERROR result = WERR_OK;
 446
 447         if ( regdb ) {
 448                 DEBUG(10,("regdb_open: incrementing refcount (%d)\n", regdb_refcount));
 449                 regdb_refcount++;
 450                 return WERR_OK;
 451         }
 452
 453         become_root();
 454
 455         regdb = db_open(NULL, state_path("registry.tdb"), 0,
 456                               REG_TDB_FLAGS, O_RDWR, 0600);
 457         if ( !regdb ) {
 458                 result = ntstatus_to_werror( map_nt_error_from_unix( errno ) );
 459                 DEBUG(0,("regdb_open: Failed to open %s! (%s)\n",
 460                         state_path("registry.tdb"), strerror(errno) ));
 461         }
 462
 463         unbecome_root();
 464
 465         regdb_refcount = 1;
 466         DEBUG(10,("regdb_open: refcount reset (%d)\n", regdb_refcount));
 467
 468         return result;
 469 }
 470
 471 /***********************************************************************
 472  ***********************************************************************/
 473
 474 int regdb_close( void )
 475 {
 476         if (regdb_refcount == 0) {
 477                 return 0;
 478         }
 479
 480         regdb_refcount--;
 481
 482         DEBUG(10,("regdb_close: decrementing refcount (%d)\n", regdb_refcount));
 483
 484         if ( regdb_refcount > 0 )
 485                 return 0;
 486
 487         SMB_ASSERT( regdb_refcount >= 0 );
 488
 489         TALLOC_FREE(regdb);
 490         return 0;
 491 }
 492
 493 WERROR regdb_transaction_start(void)
 494 {
 495         return (regdb->transaction_start(regdb) == 0) ?
 496                 WERR_OK : WERR_REG_IO_FAILURE;
 497 }
 498
 499 WERROR regdb_transaction_commit(void)
 500 {
 501         return (regdb->transaction_commit(regdb) == 0) ?
 502                 WERR_OK : WERR_REG_IO_FAILURE;
 503 }
 504
 505 WERROR regdb_transaction_cancel(void)
 506 {
 507         return (regdb->transaction_cancel(regdb) == 0) ?
 508                 WERR_OK : WERR_REG_IO_FAILURE;
 509 }
 510
 511 /***********************************************************************
 512  return the tdb sequence number of the registry tdb.
 513  this is an indicator for the content of the registry
 514  having changed. it will change upon regdb_init, too, though.
 515  ***********************************************************************/
 516 int regdb_get_seqnum(void)
 517 {
 518         return regdb->get_seqnum(regdb);
 519 }
 520
 521
 522 static WERROR regdb_delete_key_with_prefix(struct db_context *db,
 523                                            const char *keyname,
 524                                            const char *prefix)
 525 {
 526         char *path;
 527         WERROR werr = WERR_NOMEM;
 528         TALLOC_CTX *mem_ctx = talloc_stackframe();
 529
 530         if (keyname == NULL) {
 531                 werr = WERR_INVALID_PARAM;
 532                 goto done;
 533         }
 534
 535         if (prefix == NULL) {
 536                 path = discard_const_p(char, keyname);
 537         } else {
 538                 path = talloc_asprintf(mem_ctx, "%s/%s", prefix, keyname);
 539                 if (path == NULL) {
 540                         goto done;
 541                 }
 542         }
 543
 544         path = normalize_reg_path(mem_ctx, path);
 545         if (path == NULL) {
 546                 goto done;
 547         }
 548
 549         werr = ntstatus_to_werror(dbwrap_delete_bystring(db, path));
 550
 551         /* treat "not" found" as ok */
 552         if (W_ERROR_EQUAL(werr, WERR_NOT_FOUND)) {
 553                 werr = WERR_OK;
 554         }
 555
 556 done:
 557         talloc_free(mem_ctx);
 558         return werr;
 559 }
 560
 561
 562 static WERROR regdb_delete_values(struct db_context *db, const char *keyname)
 563 {
 564         return regdb_delete_key_with_prefix(db, keyname, REG_VALUE_PREFIX);
 565 }
 566
 567 static WERROR regdb_delete_secdesc(struct db_context *db, const char *keyname)
 568 {
 569         return regdb_delete_key_with_prefix(db, keyname, REG_SECDESC_PREFIX);
 570 }
 571
 572 static WERROR regdb_delete_subkeylist(struct db_context *db, const char *keyname)
 573 {
 574         return regdb_delete_key_with_prefix(db, keyname, NULL);
 575 }
 576
 577 static WERROR regdb_delete_key_lists(struct db_context *db, const char *keyname)
 578 {
 579         WERROR werr;
 580
 581         werr = regdb_delete_values(db, keyname);
 582         if (!W_ERROR_IS_OK(werr)) {
 583                 DEBUG(1, (__location__ " Deleting %s/%s failed: %s\n",
 584                           REG_VALUE_PREFIX, keyname, win_errstr(werr)));
 585                 goto done;
 586         }
 587
 588         werr = regdb_delete_secdesc(db, keyname);
 589         if (!W_ERROR_IS_OK(werr)) {
 590                 DEBUG(1, (__location__ " Deleting %s/%s failed: %s\n",
 591                           REG_SECDESC_PREFIX, keyname, win_errstr(werr)));
 592                 goto done;
 593         }
 594
 595         werr = regdb_delete_subkeylist(db, keyname);
 596         if (!W_ERROR_IS_OK(werr)) {
 597                 DEBUG(1, (__location__ " Deleting %s failed: %s\n",
 598                           keyname, win_errstr(werr)));
 599                 goto done;
 600         }
 601
 602 done:
 603         return werr;
 604 }
 605
 606 /***********************************************************************
 607  Add subkey strings to the registry tdb under a defined key
 608  fmt is the same format as tdb_pack except this function only supports
 609  fstrings
 610  ***********************************************************************/
 611
 612 static bool regdb_store_keys_internal2(struct db_context *db,
 613                                        const char *key,
 614                                        struct regsubkey_ctr *ctr)
 615 {
 616         TDB_DATA dbuf;
 617         uint8 *buffer = NULL;
 618         int i = 0;
 619         uint32 len, buflen;
 620         bool ret = true;
 621         uint32 num_subkeys = regsubkey_ctr_numkeys(ctr);
 622         char *keyname = NULL;
 623         TALLOC_CTX *ctx = talloc_stackframe();
 624         NTSTATUS status;
 625
 626         if (!key) {
 627                 return false;
 628         }
 629
 630         keyname = talloc_strdup(ctx, key);
 631         if (!keyname) {
 632                 return false;
 633         }
 634         keyname = normalize_reg_path(ctx, keyname);
 635
 636         /* allocate some initial memory */
 637
 638         buffer = (uint8 *)SMB_MALLOC(1024);
 639         if (buffer == NULL) {
 640                 return false;
 641         }
 642         buflen = 1024;
 643         len = 0;
 644
 645         /* store the number of subkeys */
 646
 647         len += tdb_pack(buffer+len, buflen-len, "d", num_subkeys);
 648
 649         /* pack all the strings */
 650
 651         for (i=0; i<num_subkeys; i++) {
 652                 size_t thistime;
 653
 654                 thistime = tdb_pack(buffer+len, buflen-len, "f",
 655                                     regsubkey_ctr_specific_key(ctr, i));
 656                 if (len+thistime > buflen) {
 657                         size_t thistime2;
 658                         /*
 659                          * tdb_pack hasn't done anything because of the short
 660                          * buffer, allocate extra space.
 661                          */
 662                         buffer = SMB_REALLOC_ARRAY(buffer, uint8_t,
 663                                                    (len+thistime)*2);
 664                         if(buffer == NULL) {
 665                                 DEBUG(0, ("regdb_store_keys: Failed to realloc "
 666                                           "memory of size [%u]\n",
 667                                           (unsigned int)(len+thistime)*2));
 668                                 ret = false;
 669                                 goto done;
 670                         }
 671                         buflen = (len+thistime)*2;
 672                         thistime2 = tdb_pack(
 673                                 buffer+len, buflen-len, "f",
 674                                 regsubkey_ctr_specific_key(ctr, i));
 675                         if (thistime2 != thistime) {
 676                                 DEBUG(0, ("tdb_pack failed\n"));
 677                                 ret = false;
 678                                 goto done;
 679                         }
 680                 }
 681                 len += thistime;
 682         }
 683
 684         /* finally write out the data */
 685
 686         dbuf.dptr = buffer;
 687         dbuf.dsize = len;
 688         status = dbwrap_store_bystring(db, keyname, dbuf, TDB_REPLACE);
 689         if (!NT_STATUS_IS_OK(status)) {
 690                 ret = false;
 691                 goto done;
 692         }
 693
 694         /*
 695          * Delete a sorted subkey cache for regdb_key_exists, will be
 696          * recreated automatically
 697          */
 698         keyname = talloc_asprintf(ctx, "%s/%s", REG_SORTED_SUBKEYS_PREFIX,
 699                                   keyname);
 700         if (keyname != NULL) {
 701                 dbwrap_delete_bystring(db, keyname);
 702         }
 703
 704 done:
 705         TALLOC_FREE(ctx);
 706         SAFE_FREE(buffer);
 707         return ret;
 708 }
 709
 710 /***********************************************************************
 711  Store the new subkey record and create any child key records that
 712  do not currently exist
 713  ***********************************************************************/
 714
 715 static bool regdb_store_keys_internal(struct db_context *db, const char *key,
 716                                       struct regsubkey_ctr *ctr)
 717 {
 718         int num_subkeys, old_num_subkeys, i;
 719         char *path = NULL;
 720         struct regsubkey_ctr *subkeys = NULL, *old_subkeys = NULL;
 721         char *oldkeyname = NULL;
 722         TALLOC_CTX *ctx = talloc_stackframe();
 723         WERROR werr;
 724
 725         if (!regdb_key_is_base_key(key) && !regdb_key_exists(db, key)) {
 726                 goto fail;
 727         }
 728
 729         /*
 730          * fetch a list of the old subkeys so we can determine if anything has
 731          * changed
 732          */
 733
 734         werr = regsubkey_ctr_init(ctx, &old_subkeys);
 735         if (!W_ERROR_IS_OK(werr)) {
 736                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 737                 return false;
 738         }
 739
 740         regdb_fetch_keys_internal(db, key, old_subkeys);
 741
 742         num_subkeys = regsubkey_ctr_numkeys(ctr);
 743         old_num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
 744         if ((num_subkeys && old_num_subkeys) &&
 745             (num_subkeys == old_num_subkeys)) {
 746
 747                 for (i = 0; i < num_subkeys; i++) {
 748                         if (strcmp(regsubkey_ctr_specific_key(ctr, i),
 749                                    regsubkey_ctr_specific_key(old_subkeys, i))
 750                             != 0)
 751                         {
 752                                 break;
 753                         }
 754                 }
 755                 if (i == num_subkeys) {
 756                         /*
 757                          * Nothing changed, no point to even start a tdb
 758                          * transaction
 759                          */
 760                         TALLOC_FREE(old_subkeys);
 761                         return true;
 762                 }
 763         }
 764
 765         TALLOC_FREE(old_subkeys);
 766
 767         if (db->transaction_start(db) != 0) {
 768                 DEBUG(0, ("regdb_store_keys: transaction_start failed\n"));
 769                 goto fail;
 770         }
 771
 772         /*
 773          * Re-fetch the old keys inside the transaction
 774          */
 775
 776         werr = regsubkey_ctr_init(ctx, &old_subkeys);
 777         if (!W_ERROR_IS_OK(werr)) {
 778                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 779                 goto cancel;
 780         }
 781
 782         regdb_fetch_keys_internal(db, key, old_subkeys);
 783
 784         /*
 785          * Make the store operation as safe as possible without transactions:
 786          *
 787          * (1) For each subkey removed from ctr compared with old_subkeys:
 788          *
 789          *     (a) First delete the value db entry.
 790          *
 791          *     (b) Next delete the secdesc db record.
 792          *
 793          *     (c) Then delete the subkey list entry.
 794          *
 795          * (2) Now write the list of subkeys of the parent key,
 796          *     deleting removed entries and adding new ones.
 797          *
 798          * (3) Finally create the subkey list entries for the added keys.
 799          *
 800          * This way if we crash half-way in between deleting the subkeys
 801          * and storing the parent's list of subkeys, no old data can pop up
 802          * out of the blue when re-adding keys later on.
 803          */
 804
 805         /* (1) delete removed keys' lists (values/secdesc/subkeys) */
 806
 807         num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
 808         for (i=0; i<num_subkeys; i++) {
 809                 oldkeyname = regsubkey_ctr_specific_key(old_subkeys, i);
 810
 811                 if (regsubkey_ctr_key_exists(ctr, oldkeyname)) {
 812                         /*
 813                          * It's still around, don't delete
 814                          */
 815
 816                         continue;
 817                 }
 818
 819                 path = talloc_asprintf(ctx, "%s/%s", key, oldkeyname);
 820                 if (!path) {
 821                         goto cancel;
 822                 }
 823
 824                 werr = regdb_delete_key_lists(db, path);
 825                 W_ERROR_NOT_OK_GOTO(werr, cancel);
 826
 827                 TALLOC_FREE(path);
 828         }
 829
 830         TALLOC_FREE(old_subkeys);
 831
 832         /* (2) store the subkey list for the parent */
 833
 834         if (!regdb_store_keys_internal2(db, key, ctr)) {
 835                 DEBUG(0,("regdb_store_keys: Failed to store new subkey list "
 836                          "for parent [%s]\n", key));
 837                 goto cancel;
 838         }
 839
 840         /* (3) now create records for any subkeys that don't already exist */
 841
 842         num_subkeys = regsubkey_ctr_numkeys(ctr);
 843
 844         if (num_subkeys == 0) {
 845                 werr = regsubkey_ctr_init(ctx, &subkeys);
 846                 if (!W_ERROR_IS_OK(werr)) {
 847                         DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 848                         goto cancel;
 849                 }
 850
 851                 if (!regdb_store_keys_internal2(db, key, subkeys)) {
 852                         DEBUG(0,("regdb_store_keys: Failed to store "
 853                                  "new record for key [%s]\n", key));
 854                         goto cancel;
 855                 }
 856                 TALLOC_FREE(subkeys);
 857
 858         }
 859
 860         for (i=0; i<num_subkeys; i++) {
 861                 path = talloc_asprintf(ctx, "%s/%s",
 862                                         key,
 863                                         regsubkey_ctr_specific_key(ctr, i));
 864                 if (!path) {
 865                         goto cancel;
 866                 }
 867                 werr = regsubkey_ctr_init(ctx, &subkeys);
 868                 if (!W_ERROR_IS_OK(werr)) {
 869                         DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 870                         goto cancel;
 871                 }
 872
 873                 if (regdb_fetch_keys_internal(db, path, subkeys) == -1) {
 874                         /* create a record with 0 subkeys */
 875                         if (!regdb_store_keys_internal2(db, path, subkeys)) {
 876                                 DEBUG(0,("regdb_store_keys: Failed to store "
 877                                          "new record for key [%s]\n", path));
 878                                 goto cancel;
 879                         }
 880                 }
 881
 882                 TALLOC_FREE(subkeys);
 883                 TALLOC_FREE(path);
 884         }
 885
 886         if (db->transaction_commit(db) != 0) {
 887                 DEBUG(0, ("regdb_store_keys: Could not commit transaction\n"));
 888                 goto fail;
 889         }
 890
 891         TALLOC_FREE(ctx);
 892         return true;
 893
 894 cancel:
 895         if (db->transaction_cancel(db) != 0) {
 896                 smb_panic("regdb_store_keys: transaction_cancel failed\n");
 897         }
 898
 899 fail:
 900         TALLOC_FREE(ctx);
 901
 902         return false;
 903 }
 904
 905 bool regdb_store_keys(const char *key, struct regsubkey_ctr *ctr)
 906 {
 907         return regdb_store_keys_internal(regdb, key, ctr);
 908 }
 909
 910 static WERROR regdb_create_subkey(const char *key, const char *subkey)
 911 {
 912         WERROR werr;
 913         struct regsubkey_ctr *subkeys;
 914         TALLOC_CTX *mem_ctx = talloc_stackframe();
 915
 916         if (!regdb_key_is_base_key(key) && !regdb_key_exists(regdb, key)) {
 917                 werr = WERR_NOT_FOUND;
 918                 goto done;
 919         }
 920
 921         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
 922         W_ERROR_NOT_OK_GOTO_DONE(werr);
 923
 924         if (regdb_fetch_keys_internal(regdb, key, subkeys) < 0) {
 925                 werr = WERR_REG_IO_FAILURE;
 926                 goto done;
 927         }
 928
 929         if (regsubkey_ctr_key_exists(subkeys, subkey)) {
 930                 werr = WERR_OK;
 931                 goto done;
 932         }
 933
 934         talloc_free(subkeys);
 935
 936         if (regdb->transaction_start(regdb) != 0) {
 937                 werr = WERR_REG_IO_FAILURE;
 938                 goto done;
 939         }
 940
 941         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
 942         W_ERROR_NOT_OK_GOTO(werr, cancel);
 943
 944         if (regdb_fetch_keys_internal(regdb, key, subkeys) < 0) {
 945                 werr = WERR_REG_IO_FAILURE;
 946                 goto cancel;
 947         }
 948
 949         werr = regsubkey_ctr_addkey(subkeys, subkey);
 950         W_ERROR_NOT_OK_GOTO(werr, cancel);
 951
 952         if (!regdb_store_keys_internal2(regdb, key, subkeys)) {
 953                 DEBUG(0, (__location__ " failed to store new subkey list for "
 954                          "parent key %s\n", key));
 955                 werr = WERR_REG_IO_FAILURE;
 956                 goto cancel;
 957         }
 958
 959         if (regdb->transaction_commit(regdb) != 0) {
 960                 werr = WERR_REG_IO_FAILURE;
 961                 DEBUG(0, (__location__ " failed to commit transaction\n"));
 962         }
 963
 964         goto done;
 965
 966 cancel:
 967         if (regdb->transaction_cancel(regdb) != 0) {
 968                 smb_panic("regdb_create_subkey: transaction_cancel failed\n");
 969         }
 970
 971 done:
 972         talloc_free(mem_ctx);
 973         return werr;
 974 }
 975
 976 static WERROR regdb_delete_subkey(const char *key, const char *subkey)
 977 {
 978         WERROR werr;
 979         struct regsubkey_ctr *subkeys;
 980         char *path;
 981         TALLOC_CTX *mem_ctx = talloc_stackframe();
 982
 983         if (!regdb_key_is_base_key(key) && !regdb_key_exists(regdb, key)) {
 984                 werr = WERR_NOT_FOUND;
 985                 goto done;
 986         }
 987
 988         path = talloc_asprintf(mem_ctx, "%s/%s", key, subkey);
 989         if (path == NULL) {
 990                 werr = WERR_NOMEM;
 991                 goto done;
 992         }
 993
 994         if (!regdb_key_exists(regdb, path)) {
 995                 werr = WERR_OK;
 996                 goto done;
 997         }
 998
 999         if (regdb->transaction_start(regdb) != 0) {
1000                 werr = WERR_REG_IO_FAILURE;
1001                 goto done;
1002         }
1003
1004         werr = regdb_delete_key_lists(regdb, path);
1005         W_ERROR_NOT_OK_GOTO(werr, cancel);
1006
1007         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
1008         W_ERROR_NOT_OK_GOTO(werr, cancel);
1009
1010         if (regdb_fetch_keys_internal(regdb, key, subkeys) < 0) {
1011                 werr = WERR_REG_IO_FAILURE;
1012                 goto cancel;
1013         }
1014
1015         werr = regsubkey_ctr_delkey(subkeys, subkey);
1016         W_ERROR_NOT_OK_GOTO(werr, cancel);
1017
1018         if (!regdb_store_keys_internal2(regdb, key, subkeys)) {
1019                 DEBUG(0, (__location__ " failed to store new subkey_list for "
1020                          "parent key %s\n", key));
1021                 werr = WERR_REG_IO_FAILURE;
1022                 goto cancel;
1023         }
1024
1025         if (regdb->transaction_commit(regdb) != 0) {
1026                 DEBUG(0, (__location__ " failed to commit transaction\n"));
1027                 werr = WERR_REG_IO_FAILURE;
1028         }
1029
1030         goto done;
1031
1032 cancel:
1033         if (regdb->transaction_cancel(regdb) != 0) {
1034                 smb_panic("regdb_delete_subkey: transaction_cancel failed\n");
1035         }
1036
1037 done:
1038         talloc_free(mem_ctx);
1039         return werr;
1040 }
1041
1042 static TDB_DATA regdb_fetch_key_internal(struct db_context *db,
1043                                          TALLOC_CTX *mem_ctx, const char *key)
1044 {
1045         char *path = NULL;
1046         TDB_DATA data;
1047
1048         path = normalize_reg_path(mem_ctx, key);
1049         if (!path) {
1050                 return make_tdb_data(NULL, 0);
1051         }
1052
1053         data = dbwrap_fetch_bystring(db, mem_ctx, path);
1054
1055         TALLOC_FREE(path);
1056         return data;
1057 }
1058
1059
1060 /**
1061  * check whether a given key name represents a base key,
1062  * i.e one without a subkey separator ('/' or '\').
1063  */
1064 static bool regdb_key_is_base_key(const char *key)
1065 {
1066         TALLOC_CTX *mem_ctx = talloc_stackframe();
1067         bool ret = false;
1068         char *path;
1069
1070         if (key == NULL) {
1071                 goto done;
1072         }
1073
1074         path = normalize_reg_path(mem_ctx, key);
1075         if (path == NULL) {
1076                 DEBUG(0, ("out of memory! (talloc failed)\n"));
1077                 goto done;
1078         }
1079
1080         if (*path == '\0') {
1081                 goto done;
1082         }
1083
1084         ret = (strrchr(path, '/') == NULL);
1085
1086 done:
1087         TALLOC_FREE(mem_ctx);
1088         return ret;
1089 }
1090
1091 /*
1092  * regdb_key_exists() is a very frequent operation. It can be quite
1093  * time-consuming to fully fetch the parent's subkey list, talloc_strdup all
1094  * subkeys and then compare the keyname linearly to all the parent's subkeys.
1095  *
1096  * The following code tries to make this operation as efficient as possible:
1097  * Per registry key we create a list of subkeys that is very efficient to
1098  * search for existence of a subkey. Its format is:
1099  *
1100  * 4 bytes num_subkeys
1101  * 4*num_subkey bytes offset into the string array
1102  * then follows a sorted list of subkeys in uppercase
1103  *
1104  * This record is created by create_sorted_subkeys() on demand if it does not
1105  * exist. scan_parent_subkeys() uses regdb->parse_record to search the sorted
1106  * list, the parsing code and the binary search can be found in
1107  * parent_subkey_scanner. The code uses parse_record() to avoid a memcpy of
1108  * the potentially large subkey record.
1109  *
1110  * The sorted subkey record is deleted in regdb_store_keys_internal2 and
1111  * recreated on demand.
1112  */
1113
1114 static int cmp_keynames(const void *p1, const void *p2)
1115 {
1116         return StrCaseCmp(*((char **)p1), *((char **)p2));
1117 }
1118
1119 static bool create_sorted_subkeys(const char *key, const char *sorted_keyname)
1120 {
1121         char **sorted_subkeys;
1122         struct regsubkey_ctr *ctr;
1123         bool result = false;
1124         NTSTATUS status;
1125         char *buf;
1126         char *p;
1127         int i, res;
1128         size_t len;
1129         int num_subkeys;
1130         WERROR werr;
1131
1132         if (regdb->transaction_start(regdb) != 0) {
1133                 DEBUG(0, ("create_sorted_subkeys: transaction_start "
1134                           "failed\n"));
1135                 return false;
1136         }
1137
1138         werr = regsubkey_ctr_init(talloc_tos(), &ctr);
1139         if (!W_ERROR_IS_OK(werr)) {
1140                 goto fail;
1141         }
1142
1143         res = regdb_fetch_keys_internal(regdb, key, ctr);
1144         if (res == -1) {
1145                 goto fail;
1146         }
1147
1148         num_subkeys = regsubkey_ctr_numkeys(ctr);
1149         sorted_subkeys = talloc_array(ctr, char *, num_subkeys);
1150         if (sorted_subkeys == NULL) {
1151                 goto fail;
1152         }
1153
1154         len = 4 + 4*num_subkeys;
1155
1156         for (i = 0; i < num_subkeys; i++) {
1157                 sorted_subkeys[i] = talloc_strdup_upper(sorted_subkeys,
1158                                         regsubkey_ctr_specific_key(ctr, i));
1159                 if (sorted_subkeys[i] == NULL) {
1160                         goto fail;
1161                 }
1162                 len += strlen(sorted_subkeys[i])+1;
1163         }
1164
1165         qsort(sorted_subkeys, num_subkeys, sizeof(char *), cmp_keynames);
1166
1167         buf = talloc_array(ctr, char, len);
1168         if (buf == NULL) {
1169                 goto fail;
1170         }
1171         p = buf + 4 + 4*num_subkeys;
1172
1173         SIVAL(buf, 0, num_subkeys);
1174
1175         for (i=0; i < num_subkeys; i++) {
1176                 ptrdiff_t offset = p - buf;
1177                 SIVAL(buf, 4 + 4*i, offset);
1178                 strlcpy(p, sorted_subkeys[i], len-offset);
1179                 p += strlen(sorted_subkeys[i]) + 1;
1180         }
1181
1182         status = dbwrap_store_bystring(
1183                 regdb, sorted_keyname, make_tdb_data((uint8_t *)buf, len),
1184                 TDB_REPLACE);
1185         if (!NT_STATUS_IS_OK(status)) {
1186                 /*
1187                  * Don't use a "goto fail;" here, this would commit the broken
1188                  * transaction. See below for an explanation.
1189                  */
1190                 if (regdb->transaction_cancel(regdb) == -1) {
1191                         smb_panic("create_sorted_subkeys: transaction_cancel "
1192                                   "failed\n");
1193                 }
1194                 TALLOC_FREE(ctr);
1195                 return false;
1196         }
1197
1198         result = true;
1199  fail:
1200         /*
1201          * We only get here via the "goto fail" when we did not write anything
1202          * yet. Using transaction_commit even in a failure case is necessary
1203          * because this (disposable) call might be nested in other
1204          * transactions. Doing a cancel here would destroy the possibility of
1205          * a transaction_commit for transactions that we might be wrapped in.
1206          */
1207         if (regdb->transaction_commit(regdb) == -1) {
1208                 DEBUG(0, ("create_sorted_subkeys: transaction_commit "
1209                           "failed\n"));
1210                 result = false;
1211         }
1212
1213         TALLOC_FREE(ctr);
1214         return result;
1215 }
1216
1217 struct scan_subkey_state {
1218         char *name;
1219         bool scanned;
1220         bool found;
1221 };
1222
1223 static int parent_subkey_scanner(TDB_DATA key, TDB_DATA data,
1224                                  void *private_data)
1225 {
1226         struct scan_subkey_state *state =
1227                 (struct scan_subkey_state *)private_data;
1228         uint32_t num_subkeys;
1229         uint32_t l, u;
1230
1231         if (data.dsize < sizeof(uint32_t)) {
1232                 return -1;
1233         }
1234
1235         state->scanned = true;
1236         state->found = false;
1237
1238         tdb_unpack(data.dptr, data.dsize, "d", &num_subkeys);
1239
1240         l = 0;
1241         u = num_subkeys;
1242
1243         while (l < u) {
1244                 uint32_t idx = (l+u)/2;
1245                 char *s = (char *)data.dptr + IVAL(data.dptr, 4 + 4*idx);
1246                 int comparison = strcmp(state->name, s);
1247
1248                 if (comparison < 0) {
1249                         u = idx;
1250                 } else if (comparison > 0) {
1251                         l = idx + 1;
1252                 } else {
1253                         state->found = true;
1254                         return 0;
1255                 }
1256         }
1257         return 0;
1258 }
1259
1260 static bool scan_parent_subkeys(struct db_context *db, const char *parent,
1261                                 const char *name)
1262 {
1263         char *path = NULL;
1264         char *key = NULL;
1265         struct scan_subkey_state state = { 0, };
1266         bool result = false;
1267         int res;
1268
1269         state.name = NULL;
1270
1271         path = normalize_reg_path(talloc_tos(), parent);
1272         if (path == NULL) {
1273                 goto fail;
1274         }
1275
1276         key = talloc_asprintf(talloc_tos(), "%s/%s",
1277                               REG_SORTED_SUBKEYS_PREFIX, path);
1278         if (key == NULL) {
1279                 goto fail;
1280         }
1281
1282         state.name = talloc_strdup_upper(talloc_tos(), name);
1283         if (state.name == NULL) {
1284                 goto fail;
1285         }
1286         state.scanned = false;
1287
1288         res = db->parse_record(db, string_term_tdb_data(key),
1289                                parent_subkey_scanner, &state);
1290
1291         if (state.scanned) {
1292                 result = state.found;
1293         } else {
1294                 if (!create_sorted_subkeys(path, key)) {
1295                         goto fail;
1296                 }
1297                 res = db->parse_record(db, string_term_tdb_data(key),
1298                                        parent_subkey_scanner, &state);
1299                 if ((res == 0) && (state.scanned)) {
1300                         result = state.found;
1301                 }
1302         }
1303
1304  fail:
1305         TALLOC_FREE(path);
1306         TALLOC_FREE(state.name);
1307         return result;
1308 }
1309
1310 /**
1311  * Check for the existence of a key.
1312  *
1313  * Existence of a key is authoritatively defined by its
1314  * existence in the list of subkeys of its parent key.
1315  * The exeption of this are keys without a parent key,
1316  * i.e. the "base" keys (HKLM, HKCU, ...).
1317  */
1318 static bool regdb_key_exists(struct db_context *db, const char *key)
1319 {
1320         TALLOC_CTX *mem_ctx = talloc_stackframe();
1321         TDB_DATA value;
1322         bool ret = false;
1323         char *path, *p;
1324
1325         if (key == NULL) {
1326                 goto done;
1327         }
1328
1329         path = normalize_reg_path(mem_ctx, key);
1330         if (path == NULL) {
1331                 DEBUG(0, ("out of memory! (talloc failed)\n"));
1332                 goto done;
1333         }
1334
1335         if (*path == '\0') {
1336                 goto done;
1337         }
1338
1339         p = strrchr(path, '/');
1340         if (p == NULL) {
1341                 /* this is a base key */
1342                 value = regdb_fetch_key_internal(db, mem_ctx, path);
1343                 ret = (value.dptr != NULL);
1344         } else {
1345                 *p = '\0';
1346                 ret = scan_parent_subkeys(db, path, p+1);
1347         }
1348
1349 done:
1350         TALLOC_FREE(mem_ctx);
1351         return ret;
1352 }
1353
1354
1355 /***********************************************************************
1356  Retrieve an array of strings containing subkeys.  Memory should be
1357  released by the caller.
1358  ***********************************************************************/
1359
1360 static int regdb_fetch_keys_internal(struct db_context *db, const char *key,
1361                                      struct regsubkey_ctr *ctr)
1362 {
1363         WERROR werr;
1364         uint32 num_items;
1365         uint8 *buf;
1366         uint32 buflen, len;
1367         int i;
1368         fstring subkeyname;
1369         int ret = -1;
1370         TALLOC_CTX *frame = talloc_stackframe();
1371         TDB_DATA value;
1372
1373         DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL"));
1374
1375         if (!regdb_key_exists(db, key)) {
1376                 goto done;
1377         }
1378
1379         werr = regsubkey_ctr_set_seqnum(ctr, db->get_seqnum(db));
1380         if (!W_ERROR_IS_OK(werr)) {
1381                 goto done;
1382         }
1383
1384         value = regdb_fetch_key_internal(db, frame, key);
1385
1386         if (value.dptr == NULL) {
1387                 DEBUG(10, ("regdb_fetch_keys: no subkeys found for key [%s]\n",
1388                            key));
1389                 ret = 0;
1390                 goto done;
1391         }
1392
1393         buf = value.dptr;
1394         buflen = value.dsize;
1395         len = tdb_unpack( buf, buflen, "d", &num_items);
1396
1397         for (i=0; i<num_items; i++) {
1398                 len += tdb_unpack(buf+len, buflen-len, "f", subkeyname);
1399                 werr = regsubkey_ctr_addkey(ctr, subkeyname);
1400                 if (!W_ERROR_IS_OK(werr)) {
1401                         DEBUG(5, ("regdb_fetch_keys: regsubkey_ctr_addkey "
1402                                   "failed: %s\n", win_errstr(werr)));
1403                         goto done;
1404                 }
1405         }
1406
1407         DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items));
1408
1409         ret = num_items;
1410 done:
1411         TALLOC_FREE(frame);
1412         return ret;
1413 }
1414
1415 int regdb_fetch_keys(const char *key, struct regsubkey_ctr *ctr)
1416 {
1417         return regdb_fetch_keys_internal(regdb, key, ctr);
1418 }
1419
1420 /****************************************************************************
1421  Unpack a list of registry values frem the TDB
1422  ***************************************************************************/
1423
1424 static int regdb_unpack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1425 {
1426         int             len = 0;
1427         uint32          type;
1428         fstring valuename;
1429         uint32          size;
1430         uint8           *data_p;
1431         uint32          num_values = 0;
1432         int             i;
1433
1434         /* loop and unpack the rest of the registry values */
1435
1436         len += tdb_unpack(buf+len, buflen-len, "d", &num_values);
1437
1438         for ( i=0; i<num_values; i++ ) {
1439                 /* unpack the next regval */
1440
1441                 type = REG_NONE;
1442                 size = 0;
1443                 data_p = NULL;
1444                 valuename[0] = '\0';
1445                 len += tdb_unpack(buf+len, buflen-len, "fdB",
1446                                   valuename,
1447                                   &type,
1448                                   &size,
1449                                   &data_p);
1450
1451                 /* add the new value. Paranoid protective code -- make sure data_p is valid */
1452
1453                 if (*valuename && size && data_p) {
1454                         regval_ctr_addvalue(values, valuename, type,
1455                                         (const char *)data_p, size);
1456                 }
1457                 SAFE_FREE(data_p); /* 'B' option to tdb_unpack does a malloc() */
1458
1459                 DEBUG(8,("specific: [%s], len: %d\n", valuename, size));
1460         }
1461
1462         return len;
1463 }
1464
1465 /****************************************************************************
1466  Pack all values in all printer keys
1467  ***************************************************************************/
1468
1469 static int regdb_pack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1470 {
1471         int             len = 0;
1472         int             i;
1473         struct regval_blob      *val;
1474         int             num_values;
1475
1476         if ( !values )
1477                 return 0;
1478
1479         num_values = regval_ctr_numvals( values );
1480
1481         /* pack the number of values first */
1482
1483         len += tdb_pack( buf+len, buflen-len, "d", num_values );
1484
1485         /* loop over all values */
1486
1487         for ( i=0; i<num_values; i++ ) {
1488                 val = regval_ctr_specific_value( values, i );
1489                 len += tdb_pack(buf+len, buflen-len, "fdB",
1490                                 regval_name(val),
1491                                 regval_type(val),
1492                                 regval_size(val),
1493                                 regval_data_p(val) );
1494         }
1495
1496         return len;
1497 }
1498
1499 /***********************************************************************
1500  Retrieve an array of strings containing subkeys.  Memory should be
1501  released by the caller.
1502  ***********************************************************************/
1503
1504 static int regdb_fetch_values_internal(struct db_context *db, const char* key,
1505                                        struct regval_ctr *values)
1506 {
1507         char *keystr = NULL;
1508         TALLOC_CTX *ctx = talloc_stackframe();
1509         int ret = 0;
1510         TDB_DATA value;
1511
1512         DEBUG(10,("regdb_fetch_values: Looking for value of key [%s] \n", key));
1513
1514         if (!regdb_key_exists(db, key)) {
1515                 goto done;
1516         }
1517
1518         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key);
1519         if (!keystr) {
1520                 goto done;
1521         }
1522
1523         values->seqnum = db->get_seqnum(db);
1524
1525         value = regdb_fetch_key_internal(db, ctx, keystr);
1526
1527         if (!value.dptr) {
1528                 /* all keys have zero values by default */
1529                 goto done;
1530         }
1531
1532         regdb_unpack_values(values, value.dptr, value.dsize);
1533         ret = regval_ctr_numvals(values);
1534
1535 done:
1536         TALLOC_FREE(ctx);
1537         return ret;
1538 }
1539
1540 int regdb_fetch_values(const char* key, struct regval_ctr *values)
1541 {
1542         return regdb_fetch_values_internal(regdb, key, values);
1543 }
1544
1545 bool regdb_store_values(const char *key, struct regval_ctr *values)
1546 {
1547         TDB_DATA old_data, data;
1548         char *keystr = NULL;
1549         TALLOC_CTX *ctx = talloc_stackframe();
1550         int len;
1551         NTSTATUS status;
1552         bool result = false;
1553
1554         DEBUG(10,("regdb_store_values: Looking for value of key [%s] \n", key));
1555
1556         if (!regdb_key_exists(regdb, key)) {
1557                 goto done;
1558         }
1559
1560         ZERO_STRUCT(data);
1561
1562         len = regdb_pack_values(values, data.dptr, data.dsize);
1563         if (len <= 0) {
1564                 DEBUG(0,("regdb_store_values: unable to pack values. len <= 0\n"));
1565                 goto done;
1566         }
1567
1568         data.dptr = TALLOC_ARRAY(ctx, uint8, len);
1569         data.dsize = len;
1570
1571         len = regdb_pack_values(values, data.dptr, data.dsize);
1572
1573         SMB_ASSERT( len == data.dsize );
1574
1575         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key );
1576         if (!keystr) {
1577                 goto done;
1578         }
1579         keystr = normalize_reg_path(ctx, keystr);
1580         if (!keystr) {
1581                 goto done;
1582         }
1583
1584         old_data = dbwrap_fetch_bystring(regdb, ctx, keystr);
1585
1586         if ((old_data.dptr != NULL)
1587             && (old_data.dsize == data.dsize)
1588             && (memcmp(old_data.dptr, data.dptr, data.dsize) == 0))
1589         {
1590                 result = true;
1591                 goto done;
1592         }
1593
1594         status = dbwrap_trans_store_bystring(regdb, keystr, data, TDB_REPLACE);
1595
1596         result = NT_STATUS_IS_OK(status);
1597
1598 done:
1599         TALLOC_FREE(ctx);
1600         return result;
1601 }
1602
1603 static WERROR regdb_get_secdesc(TALLOC_CTX *mem_ctx, const char *key,
1604                                 struct security_descriptor **psecdesc)
1605 {
1606         char *tdbkey;
1607         TDB_DATA data;
1608         NTSTATUS status;
1609         TALLOC_CTX *tmp_ctx = talloc_stackframe();
1610         WERROR err = WERR_OK;
1611
1612         DEBUG(10, ("regdb_get_secdesc: Getting secdesc of key [%s]\n", key));
1613
1614         if (!regdb_key_exists(regdb, key)) {
1615                 err = WERR_BADFILE;
1616                 goto done;
1617         }
1618
1619         tdbkey = talloc_asprintf(tmp_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1620         if (tdbkey == NULL) {
1621                 err = WERR_NOMEM;
1622                 goto done;
1623         }
1624         normalize_dbkey(tdbkey);
1625
1626         data = dbwrap_fetch_bystring(regdb, tmp_ctx, tdbkey);
1627         if (data.dptr == NULL) {
1628                 err = WERR_BADFILE;
1629                 goto done;
1630         }
1631
1632         status = unmarshall_sec_desc(mem_ctx, (uint8 *)data.dptr, data.dsize,
1633                                      psecdesc);
1634
1635         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1636                 err = WERR_NOMEM;
1637         } else if (!NT_STATUS_IS_OK(status)) {
1638                 err = WERR_REG_CORRUPT;
1639         }
1640
1641 done:
1642         TALLOC_FREE(tmp_ctx);
1643         return err;
1644 }
1645
1646 static WERROR regdb_set_secdesc(const char *key,
1647                                 struct security_descriptor *secdesc)
1648 {
1649         TALLOC_CTX *mem_ctx = talloc_stackframe();
1650         char *tdbkey;
1651         WERROR err = WERR_NOMEM;
1652         TDB_DATA tdbdata;
1653
1654         if (!regdb_key_exists(regdb, key)) {
1655                 err = WERR_BADFILE;
1656                 goto done;
1657         }
1658
1659         tdbkey = talloc_asprintf(mem_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1660         if (tdbkey == NULL) {
1661                 goto done;
1662         }
1663         normalize_dbkey(tdbkey);
1664
1665         if (secdesc == NULL) {
1666                 /* assuming a delete */
1667                 err = ntstatus_to_werror(dbwrap_trans_delete_bystring(regdb,
1668                                                                       tdbkey));
1669                 goto done;
1670         }
1671
1672         err = ntstatus_to_werror(marshall_sec_desc(mem_ctx, secdesc,
1673                                                    &tdbdata.dptr,
1674                                                    &tdbdata.dsize));
1675         W_ERROR_NOT_OK_GOTO_DONE(err);
1676
1677         err = ntstatus_to_werror(dbwrap_trans_store_bystring(regdb, tdbkey,
1678                                                              tdbdata, 0));
1679
1680  done:
1681         TALLOC_FREE(mem_ctx);
1682         return err;
1683 }
1684
1685 bool regdb_subkeys_need_update(struct regsubkey_ctr *subkeys)
1686 {
1687         return (regdb_get_seqnum() != regsubkey_ctr_get_seqnum(subkeys));
1688 }
1689
1690 bool regdb_values_need_update(struct regval_ctr *values)
1691 {
1692         return (regdb_get_seqnum() != values->seqnum);
1693 }
1694
1695 /*
1696  * Table of function pointers for default access
1697  */
1698
1699 struct registry_ops regdb_ops = {
1700         .fetch_subkeys = regdb_fetch_keys,
1701         .fetch_values = regdb_fetch_values,
1702         .store_subkeys = regdb_store_keys,
1703         .store_values = regdb_store_values,
1704         .create_subkey = regdb_create_subkey,
1705         .delete_subkey = regdb_delete_subkey,
1706         .get_secdesc = regdb_get_secdesc,
1707         .set_secdesc = regdb_set_secdesc,
1708         .subkeys_need_update = regdb_subkeys_need_update,
1709         .values_need_update = regdb_values_need_update
1710 };