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 static bool regdb_store_values_internal(struct db_context *db, const char *key,
  39                                         struct regval_ctr *values);
  40
  41 /* List the deepest path into the registry.  All part components will be created.*/
  42
  43 /* If you want to have a part of the path controlled by the tdb and part by
  44    a virtual registry db (e.g. printing), then you have to list the deepest path.
  45    For example,"HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion/Print"
  46    allows the reg_db backend to handle everything up to
  47    "HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion" and then we'll hook
  48    the reg_printing backend onto the last component of the path (see
  49    KEY_PRINTING_2K in include/rpc_reg.h)   --jerry */
  50
  51 static const char *builtin_registry_paths[] = {
  52         KEY_PRINTING_2K,
  53         KEY_PRINTING_PORTS,
  54         KEY_PRINTING,
  55         KEY_SHARES,
  56         KEY_EVENTLOG,
  57         KEY_SMBCONF,
  58         KEY_PERFLIB,
  59         KEY_PERFLIB_009,
  60         KEY_GROUP_POLICY,
  61         KEY_SAMBA_GROUP_POLICY,
  62         KEY_GP_MACHINE_POLICY,
  63         KEY_GP_MACHINE_WIN_POLICY,
  64         KEY_HKCU,
  65         KEY_GP_USER_POLICY,
  66         KEY_GP_USER_WIN_POLICY,
  67         KEY_WINLOGON_GPEXT_PATH,
  68         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Print\\Monitors",
  69         KEY_PROD_OPTIONS,
  70         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Terminal Server\\DefaultUserConfiguration",
  71         KEY_TCPIP_PARAMS,
  72         KEY_NETLOGON_PARAMS,
  73         KEY_HKU,
  74         KEY_HKCR,
  75         KEY_HKPD,
  76         KEY_HKPT,
  77          NULL };
  78
  79 struct builtin_regkey_value {
  80         const char *path;
  81         const char *valuename;
  82         uint32 type;
  83         union {
  84                 const char *string;
  85                 uint32 dw_value;
  86         } data;
  87 };
  88
  89 static struct builtin_regkey_value builtin_registry_values[] = {
  90         { KEY_PRINTING_PORTS,
  91                 SAMBA_PRINTER_PORT_NAME, REG_SZ, { "" } },
  92         { KEY_PRINTING_2K,
  93                 "DefaultSpoolDirectory", REG_SZ, { "C:\\Windows\\System32\\Spool\\Printers" } },
  94         { KEY_EVENTLOG,
  95                 "DisplayName", REG_SZ, { "Event Log" } },
  96         { KEY_EVENTLOG,
  97                 "ErrorControl", REG_DWORD, { (char*)0x00000001 } },
  98         { NULL, NULL, 0, { NULL } }
  99 };
 100
 101 /**
 102  * Initialize a key in the registry:
 103  * create each component key of the specified path.
 104  */
 105 static WERROR init_registry_key_internal(struct db_context *db,
 106                                          const char *add_path)
 107 {
 108         WERROR werr;
 109         TALLOC_CTX *frame = talloc_stackframe();
 110         char *path = NULL;
 111         char *base = NULL;
 112         char *remaining = NULL;
 113         char *keyname;
 114         char *subkeyname;
 115         struct regsubkey_ctr *subkeys;
 116         const char *p, *p2;
 117
 118         DEBUG(6, ("init_registry_key: Adding [%s]\n", add_path));
 119
 120         path = talloc_strdup(frame, add_path);
 121         base = talloc_strdup(frame, "");
 122         if (!path || !base) {
 123                 werr = WERR_NOMEM;
 124                 goto fail;
 125         }
 126         p = path;
 127
 128         while (next_token_talloc(frame, &p, &keyname, "\\")) {
 129
 130                 /* build up the registry path from the components */
 131
 132                 if (*base) {
 133                         base = talloc_asprintf(frame, "%s\\", base);
 134                         if (!base) {
 135                                 werr = WERR_NOMEM;
 136                                 goto fail;
 137                         }
 138                 }
 139                 base = talloc_asprintf_append(base, "%s", keyname);
 140                 if (!base) {
 141                         werr = WERR_NOMEM;
 142                         goto fail;
 143                 }
 144
 145                 /* get the immediate subkeyname (if we have one ) */
 146
 147                 subkeyname = talloc_strdup(frame, "");
 148                 if (!subkeyname) {
 149                         werr = WERR_NOMEM;
 150                         goto fail;
 151                 }
 152                 if (*p) {
 153                         remaining = talloc_strdup(frame, p);
 154                         if (!remaining) {
 155                                 werr = WERR_NOMEM;
 156                                 goto fail;
 157                         }
 158                         p2 = remaining;
 159
 160                         if (!next_token_talloc(frame, &p2,
 161                                                 &subkeyname, "\\"))
 162                         {
 163                                 subkeyname = talloc_strdup(frame,p2);
 164                                 if (!subkeyname) {
 165                                         werr = WERR_NOMEM;
 166                                         goto fail;
 167                                 }
 168                         }
 169                 }
 170
 171                 DEBUG(10,("init_registry_key: Storing key [%s] with "
 172                           "subkey [%s]\n", base,
 173                           *subkeyname ? subkeyname : "NULL"));
 174
 175                 /* we don't really care if the lookup succeeds or not
 176                  * since we are about to update the record.
 177                  * We just want any subkeys already present */
 178
 179                 werr = regsubkey_ctr_init(frame, &subkeys);
 180                 if (!W_ERROR_IS_OK(werr)) {
 181                         DEBUG(0,("talloc() failure!\n"));
 182                         goto fail;
 183                 }
 184
 185                 regdb_fetch_keys_internal(db, base, subkeys);
 186                 if (*subkeyname) {
 187                         werr = regsubkey_ctr_addkey(subkeys, subkeyname);
 188                         if (!W_ERROR_IS_OK(werr)) {
 189                                 goto fail;
 190                         }
 191                 }
 192                 if (!regdb_store_keys_internal(db, base, subkeys)) {
 193                         werr = WERR_CAN_NOT_COMPLETE;
 194                         goto fail;
 195                 }
 196         }
 197
 198         werr = WERR_OK;
 199
 200 fail:
 201         TALLOC_FREE(frame);
 202         return werr;
 203 }
 204
 205 struct init_registry_key_context {
 206         const char *add_path;
 207 };
 208
 209 static NTSTATUS init_registry_key_action(struct db_context *db,
 210                                          void *private_data)
 211 {
 212         struct init_registry_key_context *init_ctx =
 213                 (struct init_registry_key_context *)private_data;
 214
 215         return werror_to_ntstatus(init_registry_key_internal(
 216                                         db, init_ctx->add_path));
 217 }
 218
 219 /**
 220  * Initialize a key in the registry:
 221  * create each component key of the specified path,
 222  * wrapped in one db transaction.
 223  */
 224 WERROR init_registry_key(const char *add_path)
 225 {
 226         struct init_registry_key_context init_ctx;
 227
 228         if (regdb_key_exists(regdb, add_path)) {
 229                 return WERR_OK;
 230         }
 231
 232         init_ctx.add_path = add_path;
 233
 234         return ntstatus_to_werror(dbwrap_trans_do(regdb,
 235                                                   init_registry_key_action,
 236                                                   &init_ctx));
 237 }
 238
 239 /***********************************************************************
 240  Open the registry data in the tdb
 241  ***********************************************************************/
 242
 243 static void regdb_ctr_add_value(struct regval_ctr *ctr,
 244                                 struct builtin_regkey_value *value)
 245 {
 246         UNISTR2 data;
 247
 248         switch(value->type) {
 249         case REG_DWORD:
 250                 regval_ctr_addvalue(ctr, value->valuename, REG_DWORD,
 251                                     (char*)&value->data.dw_value,
 252                                     sizeof(uint32));
 253                 break;
 254
 255         case REG_SZ:
 256                 init_unistr2(&data, value->data.string, UNI_STR_TERMINATE);
 257                 regval_ctr_addvalue(ctr, value->valuename, REG_SZ,
 258                                     (char*)data.buffer,
 259                                     data.uni_str_len*sizeof(uint16));
 260                 break;
 261
 262         default:
 263                 DEBUG(0, ("regdb_ctr_add_value: invalid value type in "
 264                           "registry values [%d]\n", value->type));
 265         }
 266 }
 267
 268 static NTSTATUS init_registry_data_action(struct db_context *db,
 269                                           void *private_data)
 270 {
 271         NTSTATUS status;
 272         TALLOC_CTX *frame = talloc_stackframe();
 273         struct regval_ctr *values;
 274         int i;
 275
 276         /* loop over all of the predefined paths and add each component */
 277
 278         for (i=0; builtin_registry_paths[i] != NULL; i++) {
 279                 if (regdb_key_exists(db, builtin_registry_paths[i])) {
 280                         continue;
 281                 }
 282                 status = werror_to_ntstatus(init_registry_key_internal(db,
 283                                                   builtin_registry_paths[i]));
 284                 if (!NT_STATUS_IS_OK(status)) {
 285                         goto done;
 286                 }
 287         }
 288
 289         /* loop over all of the predefined values and add each component */
 290
 291         for (i=0; builtin_registry_values[i].path != NULL; i++) {
 292
 293                 values = TALLOC_ZERO_P(frame, struct regval_ctr);
 294                 if (values == NULL) {
 295                         status = NT_STATUS_NO_MEMORY;
 296                         goto done;
 297                 }
 298
 299                 regdb_fetch_values_internal(db,
 300                                             builtin_registry_values[i].path,
 301                                             values);
 302
 303                 /* preserve existing values across restarts. Only add new ones */
 304
 305                 if (!regval_ctr_key_exists(values,
 306                                         builtin_registry_values[i].valuename))
 307                 {
 308                         regdb_ctr_add_value(values,
 309                                             &builtin_registry_values[i]);
 310                         regdb_store_values_internal(db,
 311                                         builtin_registry_values[i].path,
 312                                         values);
 313                 }
 314                 TALLOC_FREE(values);
 315         }
 316
 317         status = NT_STATUS_OK;
 318
 319 done:
 320
 321         TALLOC_FREE(frame);
 322         return status;
 323 }
 324
 325 WERROR init_registry_data(void)
 326 {
 327         WERROR werr;
 328         TALLOC_CTX *frame = talloc_stackframe();
 329         struct regval_ctr *values;
 330         int i;
 331
 332         /*
 333          * First, check for the existence of the needed keys and values.
 334          * If all do already exist, we can save the writes.
 335          */
 336         for (i=0; builtin_registry_paths[i] != NULL; i++) {
 337                 if (!regdb_key_exists(regdb, builtin_registry_paths[i])) {
 338                         goto do_init;
 339                 }
 340         }
 341
 342         for (i=0; builtin_registry_values[i].path != NULL; i++) {
 343                 values = TALLOC_ZERO_P(frame, struct regval_ctr);
 344                 if (values == NULL) {
 345                         werr = WERR_NOMEM;
 346                         goto done;
 347                 }
 348
 349                 regdb_fetch_values_internal(regdb,
 350                                             builtin_registry_values[i].path,
 351                                             values);
 352                 if (!regval_ctr_key_exists(values,
 353                                         builtin_registry_values[i].valuename))
 354                 {
 355                         TALLOC_FREE(values);
 356                         goto do_init;
 357                 }
 358
 359                 TALLOC_FREE(values);
 360         }
 361
 362         werr = WERR_OK;
 363         goto done;
 364
 365 do_init:
 366
 367         /*
 368          * There are potentially quite a few store operations which are all
 369          * indiviually wrapped in tdb transactions. Wrapping them in a single
 370          * transaction gives just a single transaction_commit() to actually do
 371          * its fsync()s. See tdb/common/transaction.c for info about nested
 372          * transaction behaviour.
 373          */
 374
 375         werr = ntstatus_to_werror(dbwrap_trans_do(regdb,
 376                                                   init_registry_data_action,
 377                                                   NULL));
 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 WERROR 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         uint32 num_subkeys = regsubkey_ctr_numkeys(ctr);
 621         char *keyname = NULL;
 622         TALLOC_CTX *ctx = talloc_stackframe();
 623         WERROR werr;
 624
 625         if (!key) {
 626                 werr = WERR_INVALID_PARAM;
 627                 goto done;
 628         }
 629
 630         keyname = talloc_strdup(ctx, key);
 631         if (!keyname) {
 632                 werr = WERR_NOMEM;
 633                 goto done;
 634         }
 635
 636         keyname = normalize_reg_path(ctx, keyname);
 637         if (!keyname) {
 638                 werr = WERR_NOMEM;
 639                 goto done;
 640         }
 641
 642         /* allocate some initial memory */
 643
 644         buffer = (uint8 *)SMB_MALLOC(1024);
 645         if (buffer == NULL) {
 646                 werr = WERR_NOMEM;
 647                 goto done;
 648         }
 649         buflen = 1024;
 650         len = 0;
 651
 652         /* store the number of subkeys */
 653
 654         len += tdb_pack(buffer+len, buflen-len, "d", num_subkeys);
 655
 656         /* pack all the strings */
 657
 658         for (i=0; i<num_subkeys; i++) {
 659                 size_t thistime;
 660
 661                 thistime = tdb_pack(buffer+len, buflen-len, "f",
 662                                     regsubkey_ctr_specific_key(ctr, i));
 663                 if (len+thistime > buflen) {
 664                         size_t thistime2;
 665                         /*
 666                          * tdb_pack hasn't done anything because of the short
 667                          * buffer, allocate extra space.
 668                          */
 669                         buffer = SMB_REALLOC_ARRAY(buffer, uint8_t,
 670                                                    (len+thistime)*2);
 671                         if(buffer == NULL) {
 672                                 DEBUG(0, ("regdb_store_keys: Failed to realloc "
 673                                           "memory of size [%u]\n",
 674                                           (unsigned int)(len+thistime)*2));
 675                                 werr = WERR_NOMEM;
 676                                 goto done;
 677                         }
 678                         buflen = (len+thistime)*2;
 679                         thistime2 = tdb_pack(
 680                                 buffer+len, buflen-len, "f",
 681                                 regsubkey_ctr_specific_key(ctr, i));
 682                         if (thistime2 != thistime) {
 683                                 DEBUG(0, ("tdb_pack failed\n"));
 684                                 werr = WERR_CAN_NOT_COMPLETE;
 685                                 goto done;
 686                         }
 687                 }
 688                 len += thistime;
 689         }
 690
 691         /* finally write out the data */
 692
 693         dbuf.dptr = buffer;
 694         dbuf.dsize = len;
 695         werr = ntstatus_to_werror(dbwrap_store_bystring(db, keyname, dbuf,
 696                                                         TDB_REPLACE));
 697         W_ERROR_NOT_OK_GOTO_DONE(werr);
 698
 699         /*
 700          * Delete a sorted subkey cache for regdb_key_exists, will be
 701          * recreated automatically
 702          */
 703         keyname = talloc_asprintf(ctx, "%s/%s", REG_SORTED_SUBKEYS_PREFIX,
 704                                   keyname);
 705         if (keyname == NULL) {
 706                 werr = WERR_NOMEM;
 707                 goto done;
 708         }
 709
 710         werr = ntstatus_to_werror(dbwrap_delete_bystring(db, keyname));
 711
 712         /* don't treat WERR_NOT_FOUND as an error here */
 713         if (W_ERROR_EQUAL(werr, WERR_NOT_FOUND)) {
 714                 werr = WERR_OK;
 715         }
 716
 717 done:
 718         TALLOC_FREE(ctx);
 719         SAFE_FREE(buffer);
 720         return werr;
 721 }
 722
 723 /***********************************************************************
 724  Store the new subkey record and create any child key records that
 725  do not currently exist
 726  ***********************************************************************/
 727
 728 struct regdb_store_keys_context {
 729         const char *key;
 730         struct regsubkey_ctr *ctr;
 731 };
 732
 733 static NTSTATUS regdb_store_keys_action(struct db_context *db,
 734                                         void *private_data)
 735 {
 736         struct regdb_store_keys_context *store_ctx;
 737         WERROR werr;
 738         int num_subkeys, i;
 739         char *path = NULL;
 740         struct regsubkey_ctr *subkeys = NULL, *old_subkeys = NULL;
 741         char *oldkeyname = NULL;
 742         TALLOC_CTX *mem_ctx = talloc_stackframe();
 743
 744         store_ctx = (struct regdb_store_keys_context *)private_data;
 745
 746         /*
 747          * Re-fetch the old keys inside the transaction
 748          */
 749
 750         werr = regsubkey_ctr_init(mem_ctx, &old_subkeys);
 751         W_ERROR_NOT_OK_GOTO_DONE(werr);
 752
 753         regdb_fetch_keys_internal(db, store_ctx->key, old_subkeys);
 754
 755         /*
 756          * Make the store operation as safe as possible without transactions:
 757          *
 758          * (1) For each subkey removed from ctr compared with old_subkeys:
 759          *
 760          *     (a) First delete the value db entry.
 761          *
 762          *     (b) Next delete the secdesc db record.
 763          *
 764          *     (c) Then delete the subkey list entry.
 765          *
 766          * (2) Now write the list of subkeys of the parent key,
 767          *     deleting removed entries and adding new ones.
 768          *
 769          * (3) Finally create the subkey list entries for the added keys.
 770          *
 771          * This way if we crash half-way in between deleting the subkeys
 772          * and storing the parent's list of subkeys, no old data can pop up
 773          * out of the blue when re-adding keys later on.
 774          */
 775
 776         /* (1) delete removed keys' lists (values/secdesc/subkeys) */
 777
 778         num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
 779         for (i=0; i<num_subkeys; i++) {
 780                 oldkeyname = regsubkey_ctr_specific_key(old_subkeys, i);
 781
 782                 if (regsubkey_ctr_key_exists(store_ctx->ctr, oldkeyname)) {
 783                         /*
 784                          * It's still around, don't delete
 785                          */
 786                         continue;
 787                 }
 788
 789                 path = talloc_asprintf(mem_ctx, "%s/%s", store_ctx->key,
 790                                        oldkeyname);
 791                 if (!path) {
 792                         werr = WERR_NOMEM;
 793                         goto done;
 794                 }
 795
 796                 werr = regdb_delete_key_lists(db, path);
 797                 W_ERROR_NOT_OK_GOTO_DONE(werr);
 798
 799                 TALLOC_FREE(path);
 800         }
 801
 802         TALLOC_FREE(old_subkeys);
 803
 804         /* (2) store the subkey list for the parent */
 805
 806         werr = regdb_store_keys_internal2(db, store_ctx->key, store_ctx->ctr);
 807         if (!W_ERROR_IS_OK(werr)) {
 808                 DEBUG(0,("regdb_store_keys: Failed to store new subkey list "
 809                          "for parent [%s]: %s\n", store_ctx->key,
 810                          win_errstr(werr)));
 811                 goto done;
 812         }
 813
 814         /* (3) now create records for any subkeys that don't already exist */
 815
 816         num_subkeys = regsubkey_ctr_numkeys(store_ctx->ctr);
 817
 818         if (num_subkeys == 0) {
 819                 werr = regsubkey_ctr_init(mem_ctx, &subkeys);
 820                 W_ERROR_NOT_OK_GOTO_DONE(werr);
 821
 822                 werr = regdb_store_keys_internal2(db, store_ctx->key, subkeys);
 823                 if (!W_ERROR_IS_OK(werr)) {
 824                         DEBUG(0,("regdb_store_keys: Failed to store "
 825                                  "new record for key [%s]: %s\n",
 826                                  store_ctx->key, win_errstr(werr)));
 827                         goto done;
 828                 }
 829                 TALLOC_FREE(subkeys);
 830         }
 831
 832         for (i=0; i<num_subkeys; i++) {
 833                 path = talloc_asprintf(mem_ctx, "%s/%s", store_ctx->key,
 834                                 regsubkey_ctr_specific_key(store_ctx->ctr, i));
 835                 if (!path) {
 836                         werr = WERR_NOMEM;
 837                         goto done;
 838                 }
 839                 werr = regsubkey_ctr_init(mem_ctx, &subkeys);
 840                 W_ERROR_NOT_OK_GOTO_DONE(werr);
 841
 842                 if (regdb_fetch_keys_internal(db, path, subkeys) == -1) {
 843                         /* create a record with 0 subkeys */
 844                         werr = regdb_store_keys_internal2(db, path, subkeys);
 845                         if (!W_ERROR_IS_OK(werr)) {
 846                                 DEBUG(0,("regdb_store_keys: Failed to store "
 847                                          "new record for key [%s]: %s\n", path,
 848                                          win_errstr(werr)));
 849                                 goto done;
 850                         }
 851                 }
 852
 853                 TALLOC_FREE(subkeys);
 854                 TALLOC_FREE(path);
 855         }
 856
 857         werr = WERR_OK;
 858
 859 done:
 860         talloc_free(mem_ctx);
 861         return werror_to_ntstatus(werr);
 862 }
 863
 864 static bool regdb_store_keys_internal(struct db_context *db, const char *key,
 865                                       struct regsubkey_ctr *ctr)
 866 {
 867         int num_subkeys, old_num_subkeys, i;
 868         struct regsubkey_ctr *old_subkeys = NULL;
 869         TALLOC_CTX *ctx = talloc_stackframe();
 870         WERROR werr;
 871         bool ret = false;
 872         struct regdb_store_keys_context store_ctx;
 873
 874         if (!regdb_key_is_base_key(key) && !regdb_key_exists(db, key)) {
 875                 goto done;
 876         }
 877
 878         /*
 879          * fetch a list of the old subkeys so we can determine if anything has
 880          * changed
 881          */
 882
 883         werr = regsubkey_ctr_init(ctx, &old_subkeys);
 884         if (!W_ERROR_IS_OK(werr)) {
 885                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 886                 goto done;
 887         }
 888
 889         regdb_fetch_keys_internal(db, key, old_subkeys);
 890
 891         num_subkeys = regsubkey_ctr_numkeys(ctr);
 892         old_num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
 893         if ((num_subkeys && old_num_subkeys) &&
 894             (num_subkeys == old_num_subkeys)) {
 895
 896                 for (i = 0; i < num_subkeys; i++) {
 897                         if (strcmp(regsubkey_ctr_specific_key(ctr, i),
 898                                    regsubkey_ctr_specific_key(old_subkeys, i))
 899                             != 0)
 900                         {
 901                                 break;
 902                         }
 903                 }
 904                 if (i == num_subkeys) {
 905                         /*
 906                          * Nothing changed, no point to even start a tdb
 907                          * transaction
 908                          */
 909
 910                         ret = true;
 911                         goto done;
 912                 }
 913         }
 914
 915         TALLOC_FREE(old_subkeys);
 916
 917         store_ctx.key = key;
 918         store_ctx.ctr = ctr;
 919
 920         werr = ntstatus_to_werror(dbwrap_trans_do(db,
 921                                                   regdb_store_keys_action,
 922                                                   &store_ctx));
 923
 924         ret = W_ERROR_IS_OK(werr);
 925
 926 done:
 927         TALLOC_FREE(ctx);
 928
 929         return ret;
 930 }
 931
 932 bool regdb_store_keys(const char *key, struct regsubkey_ctr *ctr)
 933 {
 934         return regdb_store_keys_internal(regdb, key, ctr);
 935 }
 936
 937 struct regdb_create_subkey_context {
 938         const char *key;
 939         const char *subkey;
 940 };
 941
 942 static NTSTATUS regdb_create_subkey_action(struct db_context *db,
 943                                            void *private_data)
 944 {
 945         WERROR werr;
 946         struct regdb_create_subkey_context *create_ctx;
 947         struct regsubkey_ctr *subkeys;
 948         TALLOC_CTX *mem_ctx = talloc_stackframe();
 949
 950         create_ctx = (struct regdb_create_subkey_context *)private_data;
 951
 952         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
 953         W_ERROR_NOT_OK_GOTO_DONE(werr);
 954
 955         if (regdb_fetch_keys_internal(db, create_ctx->key, subkeys) < 0) {
 956                 werr = WERR_REG_IO_FAILURE;
 957                 goto done;
 958         }
 959
 960         werr = regsubkey_ctr_addkey(subkeys, create_ctx->subkey);
 961         W_ERROR_NOT_OK_GOTO_DONE(werr);
 962
 963         werr = regdb_store_keys_internal2(db, create_ctx->key, subkeys);
 964         if (!W_ERROR_IS_OK(werr)) {
 965                 DEBUG(0, (__location__ " failed to store new subkey list for "
 966                          "parent key %s: %s\n", create_ctx->key,
 967                          win_errstr(werr)));
 968         }
 969
 970 done:
 971         talloc_free(mem_ctx);
 972         return werror_to_ntstatus(werr);
 973 }
 974
 975 static WERROR regdb_create_subkey(const char *key, const char *subkey)
 976 {
 977         WERROR werr;
 978         struct regsubkey_ctr *subkeys;
 979         TALLOC_CTX *mem_ctx = talloc_stackframe();
 980         struct regdb_create_subkey_context create_ctx;
 981
 982         if (!regdb_key_is_base_key(key) && !regdb_key_exists(regdb, key)) {
 983                 werr = WERR_NOT_FOUND;
 984                 goto done;
 985         }
 986
 987         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
 988         W_ERROR_NOT_OK_GOTO_DONE(werr);
 989
 990         if (regdb_fetch_keys_internal(regdb, key, subkeys) < 0) {
 991                 werr = WERR_REG_IO_FAILURE;
 992                 goto done;
 993         }
 994
 995         if (regsubkey_ctr_key_exists(subkeys, subkey)) {
 996                 werr = WERR_OK;
 997                 goto done;
 998         }
 999
1000         talloc_free(subkeys);
1001
1002         create_ctx.key = key;
1003         create_ctx.subkey = subkey;
1004
1005         werr = ntstatus_to_werror(dbwrap_trans_do(regdb,
1006                                                   regdb_create_subkey_action,
1007                                                   &create_ctx));
1008
1009 done:
1010         talloc_free(mem_ctx);
1011         return werr;
1012 }
1013
1014 static WERROR regdb_delete_subkey(const char *key, const char *subkey)
1015 {
1016         WERROR werr;
1017         struct regsubkey_ctr *subkeys;
1018         char *path;
1019         TALLOC_CTX *mem_ctx = talloc_stackframe();
1020
1021         if (!regdb_key_is_base_key(key) && !regdb_key_exists(regdb, key)) {
1022                 werr = WERR_NOT_FOUND;
1023                 goto done;
1024         }
1025
1026         path = talloc_asprintf(mem_ctx, "%s/%s", key, subkey);
1027         if (path == NULL) {
1028                 werr = WERR_NOMEM;
1029                 goto done;
1030         }
1031
1032         if (!regdb_key_exists(regdb, path)) {
1033                 werr = WERR_OK;
1034                 goto done;
1035         }
1036
1037         if (regdb->transaction_start(regdb) != 0) {
1038                 werr = WERR_REG_IO_FAILURE;
1039                 goto done;
1040         }
1041
1042         werr = regdb_delete_key_lists(regdb, path);
1043         W_ERROR_NOT_OK_GOTO(werr, cancel);
1044
1045         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
1046         W_ERROR_NOT_OK_GOTO(werr, cancel);
1047
1048         if (regdb_fetch_keys_internal(regdb, key, subkeys) < 0) {
1049                 werr = WERR_REG_IO_FAILURE;
1050                 goto cancel;
1051         }
1052
1053         werr = regsubkey_ctr_delkey(subkeys, subkey);
1054         W_ERROR_NOT_OK_GOTO(werr, cancel);
1055
1056         werr = regdb_store_keys_internal2(regdb, key, subkeys);
1057         if (!W_ERROR_IS_OK(werr)) {
1058                 DEBUG(0, (__location__ " failed to store new subkey_list for "
1059                          "parent key %s: %s\n", key, win_errstr(werr)));
1060                 goto cancel;
1061         }
1062
1063         if (regdb->transaction_commit(regdb) != 0) {
1064                 DEBUG(0, (__location__ " failed to commit transaction\n"));
1065                 werr = WERR_REG_IO_FAILURE;
1066         }
1067
1068         goto done;
1069
1070 cancel:
1071         if (regdb->transaction_cancel(regdb) != 0) {
1072                 smb_panic("regdb_delete_subkey: transaction_cancel failed\n");
1073         }
1074
1075 done:
1076         talloc_free(mem_ctx);
1077         return werr;
1078 }
1079
1080 static TDB_DATA regdb_fetch_key_internal(struct db_context *db,
1081                                          TALLOC_CTX *mem_ctx, const char *key)
1082 {
1083         char *path = NULL;
1084         TDB_DATA data;
1085
1086         path = normalize_reg_path(mem_ctx, key);
1087         if (!path) {
1088                 return make_tdb_data(NULL, 0);
1089         }
1090
1091         data = dbwrap_fetch_bystring(db, mem_ctx, path);
1092
1093         TALLOC_FREE(path);
1094         return data;
1095 }
1096
1097
1098 /**
1099  * check whether a given key name represents a base key,
1100  * i.e one without a subkey separator ('/' or '\').
1101  */
1102 static bool regdb_key_is_base_key(const char *key)
1103 {
1104         TALLOC_CTX *mem_ctx = talloc_stackframe();
1105         bool ret = false;
1106         char *path;
1107
1108         if (key == NULL) {
1109                 goto done;
1110         }
1111
1112         path = normalize_reg_path(mem_ctx, key);
1113         if (path == NULL) {
1114                 DEBUG(0, ("out of memory! (talloc failed)\n"));
1115                 goto done;
1116         }
1117
1118         if (*path == '\0') {
1119                 goto done;
1120         }
1121
1122         ret = (strrchr(path, '/') == NULL);
1123
1124 done:
1125         TALLOC_FREE(mem_ctx);
1126         return ret;
1127 }
1128
1129 /*
1130  * regdb_key_exists() is a very frequent operation. It can be quite
1131  * time-consuming to fully fetch the parent's subkey list, talloc_strdup all
1132  * subkeys and then compare the keyname linearly to all the parent's subkeys.
1133  *
1134  * The following code tries to make this operation as efficient as possible:
1135  * Per registry key we create a list of subkeys that is very efficient to
1136  * search for existence of a subkey. Its format is:
1137  *
1138  * 4 bytes num_subkeys
1139  * 4*num_subkey bytes offset into the string array
1140  * then follows a sorted list of subkeys in uppercase
1141  *
1142  * This record is created by create_sorted_subkeys() on demand if it does not
1143  * exist. scan_parent_subkeys() uses regdb->parse_record to search the sorted
1144  * list, the parsing code and the binary search can be found in
1145  * parent_subkey_scanner. The code uses parse_record() to avoid a memcpy of
1146  * the potentially large subkey record.
1147  *
1148  * The sorted subkey record is deleted in regdb_store_keys_internal2 and
1149  * recreated on demand.
1150  */
1151
1152 static int cmp_keynames(const void *p1, const void *p2)
1153 {
1154         return StrCaseCmp(*((char **)p1), *((char **)p2));
1155 }
1156
1157 static bool create_sorted_subkeys(const char *key, const char *sorted_keyname)
1158 {
1159         char **sorted_subkeys;
1160         struct regsubkey_ctr *ctr;
1161         bool result = false;
1162         NTSTATUS status;
1163         char *buf;
1164         char *p;
1165         int i, res;
1166         size_t len;
1167         int num_subkeys;
1168         WERROR werr;
1169
1170         if (regdb->transaction_start(regdb) != 0) {
1171                 DEBUG(0, ("create_sorted_subkeys: transaction_start "
1172                           "failed\n"));
1173                 return false;
1174         }
1175
1176         werr = regsubkey_ctr_init(talloc_tos(), &ctr);
1177         if (!W_ERROR_IS_OK(werr)) {
1178                 goto fail;
1179         }
1180
1181         res = regdb_fetch_keys_internal(regdb, key, ctr);
1182         if (res == -1) {
1183                 goto fail;
1184         }
1185
1186         num_subkeys = regsubkey_ctr_numkeys(ctr);
1187         sorted_subkeys = talloc_array(ctr, char *, num_subkeys);
1188         if (sorted_subkeys == NULL) {
1189                 goto fail;
1190         }
1191
1192         len = 4 + 4*num_subkeys;
1193
1194         for (i = 0; i < num_subkeys; i++) {
1195                 sorted_subkeys[i] = talloc_strdup_upper(sorted_subkeys,
1196                                         regsubkey_ctr_specific_key(ctr, i));
1197                 if (sorted_subkeys[i] == NULL) {
1198                         goto fail;
1199                 }
1200                 len += strlen(sorted_subkeys[i])+1;
1201         }
1202
1203         qsort(sorted_subkeys, num_subkeys, sizeof(char *), cmp_keynames);
1204
1205         buf = talloc_array(ctr, char, len);
1206         if (buf == NULL) {
1207                 goto fail;
1208         }
1209         p = buf + 4 + 4*num_subkeys;
1210
1211         SIVAL(buf, 0, num_subkeys);
1212
1213         for (i=0; i < num_subkeys; i++) {
1214                 ptrdiff_t offset = p - buf;
1215                 SIVAL(buf, 4 + 4*i, offset);
1216                 strlcpy(p, sorted_subkeys[i], len-offset);
1217                 p += strlen(sorted_subkeys[i]) + 1;
1218         }
1219
1220         status = dbwrap_store_bystring(
1221                 regdb, sorted_keyname, make_tdb_data((uint8_t *)buf, len),
1222                 TDB_REPLACE);
1223         if (!NT_STATUS_IS_OK(status)) {
1224                 /*
1225                  * Don't use a "goto fail;" here, this would commit the broken
1226                  * transaction. See below for an explanation.
1227                  */
1228                 if (regdb->transaction_cancel(regdb) == -1) {
1229                         smb_panic("create_sorted_subkeys: transaction_cancel "
1230                                   "failed\n");
1231                 }
1232                 TALLOC_FREE(ctr);
1233                 return false;
1234         }
1235
1236         result = true;
1237  fail:
1238         /*
1239          * We only get here via the "goto fail" when we did not write anything
1240          * yet. Using transaction_commit even in a failure case is necessary
1241          * because this (disposable) call might be nested in other
1242          * transactions. Doing a cancel here would destroy the possibility of
1243          * a transaction_commit for transactions that we might be wrapped in.
1244          */
1245         if (regdb->transaction_commit(regdb) == -1) {
1246                 DEBUG(0, ("create_sorted_subkeys: transaction_commit "
1247                           "failed\n"));
1248                 result = false;
1249         }
1250
1251         TALLOC_FREE(ctr);
1252         return result;
1253 }
1254
1255 struct scan_subkey_state {
1256         char *name;
1257         bool scanned;
1258         bool found;
1259 };
1260
1261 static int parent_subkey_scanner(TDB_DATA key, TDB_DATA data,
1262                                  void *private_data)
1263 {
1264         struct scan_subkey_state *state =
1265                 (struct scan_subkey_state *)private_data;
1266         uint32_t num_subkeys;
1267         uint32_t l, u;
1268
1269         if (data.dsize < sizeof(uint32_t)) {
1270                 return -1;
1271         }
1272
1273         state->scanned = true;
1274         state->found = false;
1275
1276         tdb_unpack(data.dptr, data.dsize, "d", &num_subkeys);
1277
1278         l = 0;
1279         u = num_subkeys;
1280
1281         while (l < u) {
1282                 uint32_t idx = (l+u)/2;
1283                 char *s = (char *)data.dptr + IVAL(data.dptr, 4 + 4*idx);
1284                 int comparison = strcmp(state->name, s);
1285
1286                 if (comparison < 0) {
1287                         u = idx;
1288                 } else if (comparison > 0) {
1289                         l = idx + 1;
1290                 } else {
1291                         state->found = true;
1292                         return 0;
1293                 }
1294         }
1295         return 0;
1296 }
1297
1298 static bool scan_parent_subkeys(struct db_context *db, const char *parent,
1299                                 const char *name)
1300 {
1301         char *path = NULL;
1302         char *key = NULL;
1303         struct scan_subkey_state state = { 0, };
1304         bool result = false;
1305         int res;
1306
1307         state.name = NULL;
1308
1309         path = normalize_reg_path(talloc_tos(), parent);
1310         if (path == NULL) {
1311                 goto fail;
1312         }
1313
1314         key = talloc_asprintf(talloc_tos(), "%s/%s",
1315                               REG_SORTED_SUBKEYS_PREFIX, path);
1316         if (key == NULL) {
1317                 goto fail;
1318         }
1319
1320         state.name = talloc_strdup_upper(talloc_tos(), name);
1321         if (state.name == NULL) {
1322                 goto fail;
1323         }
1324         state.scanned = false;
1325
1326         res = db->parse_record(db, string_term_tdb_data(key),
1327                                parent_subkey_scanner, &state);
1328
1329         if (state.scanned) {
1330                 result = state.found;
1331         } else {
1332                 if (!create_sorted_subkeys(path, key)) {
1333                         goto fail;
1334                 }
1335                 res = db->parse_record(db, string_term_tdb_data(key),
1336                                        parent_subkey_scanner, &state);
1337                 if ((res == 0) && (state.scanned)) {
1338                         result = state.found;
1339                 }
1340         }
1341
1342  fail:
1343         TALLOC_FREE(path);
1344         TALLOC_FREE(state.name);
1345         return result;
1346 }
1347
1348 /**
1349  * Check for the existence of a key.
1350  *
1351  * Existence of a key is authoritatively defined by its
1352  * existence in the list of subkeys of its parent key.
1353  * The exeption of this are keys without a parent key,
1354  * i.e. the "base" keys (HKLM, HKCU, ...).
1355  */
1356 static bool regdb_key_exists(struct db_context *db, const char *key)
1357 {
1358         TALLOC_CTX *mem_ctx = talloc_stackframe();
1359         TDB_DATA value;
1360         bool ret = false;
1361         char *path, *p;
1362
1363         if (key == NULL) {
1364                 goto done;
1365         }
1366
1367         path = normalize_reg_path(mem_ctx, key);
1368         if (path == NULL) {
1369                 DEBUG(0, ("out of memory! (talloc failed)\n"));
1370                 goto done;
1371         }
1372
1373         if (*path == '\0') {
1374                 goto done;
1375         }
1376
1377         p = strrchr(path, '/');
1378         if (p == NULL) {
1379                 /* this is a base key */
1380                 value = regdb_fetch_key_internal(db, mem_ctx, path);
1381                 ret = (value.dptr != NULL);
1382         } else {
1383                 *p = '\0';
1384                 ret = scan_parent_subkeys(db, path, p+1);
1385         }
1386
1387 done:
1388         TALLOC_FREE(mem_ctx);
1389         return ret;
1390 }
1391
1392
1393 /***********************************************************************
1394  Retrieve an array of strings containing subkeys.  Memory should be
1395  released by the caller.
1396  ***********************************************************************/
1397
1398 static int regdb_fetch_keys_internal(struct db_context *db, const char *key,
1399                                      struct regsubkey_ctr *ctr)
1400 {
1401         WERROR werr;
1402         uint32 num_items;
1403         uint8 *buf;
1404         uint32 buflen, len;
1405         int i;
1406         fstring subkeyname;
1407         int ret = -1;
1408         TALLOC_CTX *frame = talloc_stackframe();
1409         TDB_DATA value;
1410
1411         DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL"));
1412
1413         if (!regdb_key_exists(db, key)) {
1414                 goto done;
1415         }
1416
1417         werr = regsubkey_ctr_set_seqnum(ctr, db->get_seqnum(db));
1418         if (!W_ERROR_IS_OK(werr)) {
1419                 goto done;
1420         }
1421
1422         value = regdb_fetch_key_internal(db, frame, key);
1423
1424         if (value.dptr == NULL) {
1425                 DEBUG(10, ("regdb_fetch_keys: no subkeys found for key [%s]\n",
1426                            key));
1427                 ret = 0;
1428                 goto done;
1429         }
1430
1431         buf = value.dptr;
1432         buflen = value.dsize;
1433         len = tdb_unpack( buf, buflen, "d", &num_items);
1434
1435         for (i=0; i<num_items; i++) {
1436                 len += tdb_unpack(buf+len, buflen-len, "f", subkeyname);
1437                 werr = regsubkey_ctr_addkey(ctr, subkeyname);
1438                 if (!W_ERROR_IS_OK(werr)) {
1439                         DEBUG(5, ("regdb_fetch_keys: regsubkey_ctr_addkey "
1440                                   "failed: %s\n", win_errstr(werr)));
1441                         goto done;
1442                 }
1443         }
1444
1445         DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items));
1446
1447         ret = num_items;
1448 done:
1449         TALLOC_FREE(frame);
1450         return ret;
1451 }
1452
1453 int regdb_fetch_keys(const char *key, struct regsubkey_ctr *ctr)
1454 {
1455         return regdb_fetch_keys_internal(regdb, key, ctr);
1456 }
1457
1458 /****************************************************************************
1459  Unpack a list of registry values frem the TDB
1460  ***************************************************************************/
1461
1462 static int regdb_unpack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1463 {
1464         int             len = 0;
1465         uint32          type;
1466         fstring valuename;
1467         uint32          size;
1468         uint8           *data_p;
1469         uint32          num_values = 0;
1470         int             i;
1471
1472         /* loop and unpack the rest of the registry values */
1473
1474         len += tdb_unpack(buf+len, buflen-len, "d", &num_values);
1475
1476         for ( i=0; i<num_values; i++ ) {
1477                 /* unpack the next regval */
1478
1479                 type = REG_NONE;
1480                 size = 0;
1481                 data_p = NULL;
1482                 valuename[0] = '\0';
1483                 len += tdb_unpack(buf+len, buflen-len, "fdB",
1484                                   valuename,
1485                                   &type,
1486                                   &size,
1487                                   &data_p);
1488
1489                 /* add the new value. Paranoid protective code -- make sure data_p is valid */
1490
1491                 if (*valuename && size && data_p) {
1492                         regval_ctr_addvalue(values, valuename, type,
1493                                         (const char *)data_p, size);
1494                 }
1495                 SAFE_FREE(data_p); /* 'B' option to tdb_unpack does a malloc() */
1496
1497                 DEBUG(8,("specific: [%s], len: %d\n", valuename, size));
1498         }
1499
1500         return len;
1501 }
1502
1503 /****************************************************************************
1504  Pack all values in all printer keys
1505  ***************************************************************************/
1506
1507 static int regdb_pack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1508 {
1509         int             len = 0;
1510         int             i;
1511         struct regval_blob      *val;
1512         int             num_values;
1513
1514         if ( !values )
1515                 return 0;
1516
1517         num_values = regval_ctr_numvals( values );
1518
1519         /* pack the number of values first */
1520
1521         len += tdb_pack( buf+len, buflen-len, "d", num_values );
1522
1523         /* loop over all values */
1524
1525         for ( i=0; i<num_values; i++ ) {
1526                 val = regval_ctr_specific_value( values, i );
1527                 len += tdb_pack(buf+len, buflen-len, "fdB",
1528                                 regval_name(val),
1529                                 regval_type(val),
1530                                 regval_size(val),
1531                                 regval_data_p(val) );
1532         }
1533
1534         return len;
1535 }
1536
1537 /***********************************************************************
1538  Retrieve an array of strings containing subkeys.  Memory should be
1539  released by the caller.
1540  ***********************************************************************/
1541
1542 static int regdb_fetch_values_internal(struct db_context *db, const char* key,
1543                                        struct regval_ctr *values)
1544 {
1545         char *keystr = NULL;
1546         TALLOC_CTX *ctx = talloc_stackframe();
1547         int ret = 0;
1548         TDB_DATA value;
1549
1550         DEBUG(10,("regdb_fetch_values: Looking for value of key [%s] \n", key));
1551
1552         if (!regdb_key_exists(db, key)) {
1553                 goto done;
1554         }
1555
1556         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key);
1557         if (!keystr) {
1558                 goto done;
1559         }
1560
1561         values->seqnum = db->get_seqnum(db);
1562
1563         value = regdb_fetch_key_internal(db, ctx, keystr);
1564
1565         if (!value.dptr) {
1566                 /* all keys have zero values by default */
1567                 goto done;
1568         }
1569
1570         regdb_unpack_values(values, value.dptr, value.dsize);
1571         ret = regval_ctr_numvals(values);
1572
1573 done:
1574         TALLOC_FREE(ctx);
1575         return ret;
1576 }
1577
1578 int regdb_fetch_values(const char* key, struct regval_ctr *values)
1579 {
1580         return regdb_fetch_values_internal(regdb, key, values);
1581 }
1582
1583 static bool regdb_store_values_internal(struct db_context *db, const char *key,
1584                                         struct regval_ctr *values)
1585 {
1586         TDB_DATA old_data, data;
1587         char *keystr = NULL;
1588         TALLOC_CTX *ctx = talloc_stackframe();
1589         int len;
1590         NTSTATUS status;
1591         bool result = false;
1592
1593         DEBUG(10,("regdb_store_values: Looking for value of key [%s] \n", key));
1594
1595         if (!regdb_key_exists(db, key)) {
1596                 goto done;
1597         }
1598
1599         ZERO_STRUCT(data);
1600
1601         len = regdb_pack_values(values, data.dptr, data.dsize);
1602         if (len <= 0) {
1603                 DEBUG(0,("regdb_store_values: unable to pack values. len <= 0\n"));
1604                 goto done;
1605         }
1606
1607         data.dptr = TALLOC_ARRAY(ctx, uint8, len);
1608         data.dsize = len;
1609
1610         len = regdb_pack_values(values, data.dptr, data.dsize);
1611
1612         SMB_ASSERT( len == data.dsize );
1613
1614         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key );
1615         if (!keystr) {
1616                 goto done;
1617         }
1618         keystr = normalize_reg_path(ctx, keystr);
1619         if (!keystr) {
1620                 goto done;
1621         }
1622
1623         old_data = dbwrap_fetch_bystring(db, ctx, keystr);
1624
1625         if ((old_data.dptr != NULL)
1626             && (old_data.dsize == data.dsize)
1627             && (memcmp(old_data.dptr, data.dptr, data.dsize) == 0))
1628         {
1629                 result = true;
1630                 goto done;
1631         }
1632
1633         status = dbwrap_trans_store_bystring(db, keystr, data, TDB_REPLACE);
1634
1635         result = NT_STATUS_IS_OK(status);
1636
1637 done:
1638         TALLOC_FREE(ctx);
1639         return result;
1640 }
1641
1642 bool regdb_store_values(const char *key, struct regval_ctr *values)
1643 {
1644         return regdb_store_values_internal(regdb, key, values);
1645 }
1646
1647 static WERROR regdb_get_secdesc(TALLOC_CTX *mem_ctx, const char *key,
1648                                 struct security_descriptor **psecdesc)
1649 {
1650         char *tdbkey;
1651         TDB_DATA data;
1652         NTSTATUS status;
1653         TALLOC_CTX *tmp_ctx = talloc_stackframe();
1654         WERROR err = WERR_OK;
1655
1656         DEBUG(10, ("regdb_get_secdesc: Getting secdesc of key [%s]\n", key));
1657
1658         if (!regdb_key_exists(regdb, key)) {
1659                 err = WERR_BADFILE;
1660                 goto done;
1661         }
1662
1663         tdbkey = talloc_asprintf(tmp_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1664         if (tdbkey == NULL) {
1665                 err = WERR_NOMEM;
1666                 goto done;
1667         }
1668         normalize_dbkey(tdbkey);
1669
1670         data = dbwrap_fetch_bystring(regdb, tmp_ctx, tdbkey);
1671         if (data.dptr == NULL) {
1672                 err = WERR_BADFILE;
1673                 goto done;
1674         }
1675
1676         status = unmarshall_sec_desc(mem_ctx, (uint8 *)data.dptr, data.dsize,
1677                                      psecdesc);
1678
1679         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1680                 err = WERR_NOMEM;
1681         } else if (!NT_STATUS_IS_OK(status)) {
1682                 err = WERR_REG_CORRUPT;
1683         }
1684
1685 done:
1686         TALLOC_FREE(tmp_ctx);
1687         return err;
1688 }
1689
1690 static WERROR regdb_set_secdesc(const char *key,
1691                                 struct security_descriptor *secdesc)
1692 {
1693         TALLOC_CTX *mem_ctx = talloc_stackframe();
1694         char *tdbkey;
1695         WERROR err = WERR_NOMEM;
1696         TDB_DATA tdbdata;
1697
1698         if (!regdb_key_exists(regdb, key)) {
1699                 err = WERR_BADFILE;
1700                 goto done;
1701         }
1702
1703         tdbkey = talloc_asprintf(mem_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1704         if (tdbkey == NULL) {
1705                 goto done;
1706         }
1707         normalize_dbkey(tdbkey);
1708
1709         if (secdesc == NULL) {
1710                 /* assuming a delete */
1711                 err = ntstatus_to_werror(dbwrap_trans_delete_bystring(regdb,
1712                                                                       tdbkey));
1713                 goto done;
1714         }
1715
1716         err = ntstatus_to_werror(marshall_sec_desc(mem_ctx, secdesc,
1717                                                    &tdbdata.dptr,
1718                                                    &tdbdata.dsize));
1719         W_ERROR_NOT_OK_GOTO_DONE(err);
1720
1721         err = ntstatus_to_werror(dbwrap_trans_store_bystring(regdb, tdbkey,
1722                                                              tdbdata, 0));
1723
1724  done:
1725         TALLOC_FREE(mem_ctx);
1726         return err;
1727 }
1728
1729 bool regdb_subkeys_need_update(struct regsubkey_ctr *subkeys)
1730 {
1731         return (regdb_get_seqnum() != regsubkey_ctr_get_seqnum(subkeys));
1732 }
1733
1734 bool regdb_values_need_update(struct regval_ctr *values)
1735 {
1736         return (regdb_get_seqnum() != values->seqnum);
1737 }
1738
1739 /*
1740  * Table of function pointers for default access
1741  */
1742
1743 struct registry_ops regdb_ops = {
1744         .fetch_subkeys = regdb_fetch_keys,
1745         .fetch_values = regdb_fetch_values,
1746         .store_subkeys = regdb_store_keys,
1747         .store_values = regdb_store_values,
1748         .create_subkey = regdb_create_subkey,
1749         .delete_subkey = regdb_delete_subkey,
1750         .get_secdesc = regdb_get_secdesc,
1751         .set_secdesc = regdb_set_secdesc,
1752         .subkeys_need_update = regdb_subkeys_need_update,
1753         .values_need_update = regdb_values_need_update
1754 };