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  *  Copyright (C) Michael Adam                      2007-2009
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 3 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 /* Implementation of internal registry database functions. */
  22
  23 #include "includes.h"
  24 #include "registry.h"
  25 #include "reg_db.h"
  26 #include "reg_util_internal.h"
  27 #include "reg_backend_db.h"
  28 #include "reg_objects.h"
  29
  30 #undef DBGC_CLASS
  31 #define DBGC_CLASS DBGC_REGISTRY
  32
  33 static struct db_context *regdb = NULL;
  34 static int regdb_refcount;
  35
  36 static bool regdb_key_exists(struct db_context *db, const char *key);
  37 static bool regdb_key_is_base_key(const char *key);
  38 static WERROR regdb_fetch_keys_internal(struct db_context *db, const char *key,
  39                                         struct regsubkey_ctr *ctr);
  40 static bool regdb_store_keys_internal(struct db_context *db, const char *key,
  41                                       struct regsubkey_ctr *ctr);
  42 static int regdb_fetch_values_internal(struct db_context *db, const char* key,
  43                                        struct regval_ctr *values);
  44 static bool regdb_store_values_internal(struct db_context *db, const char *key,
  45                                         struct regval_ctr *values);
  46
  47 /* List the deepest path into the registry.  All part components will be created.*/
  48
  49 /* If you want to have a part of the path controlled by the tdb and part by
  50    a virtual registry db (e.g. printing), then you have to list the deepest path.
  51    For example,"HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion/Print"
  52    allows the reg_db backend to handle everything up to
  53    "HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion" and then we'll hook
  54    the reg_printing backend onto the last component of the path (see
  55    KEY_PRINTING_2K in include/rpc_reg.h)   --jerry */
  56
  57 static const char *builtin_registry_paths[] = {
  58         KEY_PRINTING_2K,
  59         KEY_PRINTING_PORTS,
  60         KEY_PRINTING,
  61         KEY_SHARES,
  62         KEY_EVENTLOG,
  63         KEY_SMBCONF,
  64         KEY_PERFLIB,
  65         KEY_PERFLIB_009,
  66         KEY_GROUP_POLICY,
  67         KEY_SAMBA_GROUP_POLICY,
  68         KEY_GP_MACHINE_POLICY,
  69         KEY_GP_MACHINE_WIN_POLICY,
  70         KEY_HKCU,
  71         KEY_GP_USER_POLICY,
  72         KEY_GP_USER_WIN_POLICY,
  73         "HKLM\\Software\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\GPExtensions",
  74         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Print\\Monitors",
  75         KEY_PROD_OPTIONS,
  76         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Terminal Server\\DefaultUserConfiguration",
  77         KEY_TCPIP_PARAMS,
  78         KEY_NETLOGON_PARAMS,
  79         KEY_HKU,
  80         KEY_HKCR,
  81         KEY_HKPD,
  82         KEY_HKPT,
  83          NULL };
  84
  85 struct builtin_regkey_value {
  86         const char *path;
  87         const char *valuename;
  88         uint32 type;
  89         union {
  90                 const char *string;
  91                 uint32 dw_value;
  92         } data;
  93 };
  94
  95 static struct builtin_regkey_value builtin_registry_values[] = {
  96         { KEY_PRINTING_PORTS,
  97                 SAMBA_PRINTER_PORT_NAME, REG_SZ, { "" } },
  98         { KEY_PRINTING_2K,
  99                 "DefaultSpoolDirectory", REG_SZ, { "C:\\Windows\\System32\\Spool\\Printers" } },
 100         { KEY_EVENTLOG,
 101                 "DisplayName", REG_SZ, { "Event Log" } },
 102         { KEY_EVENTLOG,
 103                 "ErrorControl", REG_DWORD, { (char*)0x00000001 } },
 104         { NULL, NULL, 0, { NULL } }
 105 };
 106
 107 /**
 108  * Initialize a key in the registry:
 109  * create each component key of the specified path.
 110  */
 111 static WERROR init_registry_key_internal(struct db_context *db,
 112                                          const char *add_path)
 113 {
 114         WERROR werr;
 115         TALLOC_CTX *frame = talloc_stackframe();
 116         char *path = NULL;
 117         char *base = NULL;
 118         char *remaining = NULL;
 119         char *keyname;
 120         char *subkeyname;
 121         struct regsubkey_ctr *subkeys;
 122         const char *p, *p2;
 123
 124         DEBUG(6, ("init_registry_key: Adding [%s]\n", add_path));
 125
 126         path = talloc_strdup(frame, add_path);
 127         base = talloc_strdup(frame, "");
 128         if (!path || !base) {
 129                 werr = WERR_NOMEM;
 130                 goto fail;
 131         }
 132         p = path;
 133
 134         while (next_token_talloc(frame, &p, &keyname, "\\")) {
 135
 136                 /* build up the registry path from the components */
 137
 138                 if (*base) {
 139                         base = talloc_asprintf(frame, "%s\\", base);
 140                         if (!base) {
 141                                 werr = WERR_NOMEM;
 142                                 goto fail;
 143                         }
 144                 }
 145                 base = talloc_asprintf_append(base, "%s", keyname);
 146                 if (!base) {
 147                         werr = WERR_NOMEM;
 148                         goto fail;
 149                 }
 150
 151                 /* get the immediate subkeyname (if we have one ) */
 152
 153                 subkeyname = talloc_strdup(frame, "");
 154                 if (!subkeyname) {
 155                         werr = WERR_NOMEM;
 156                         goto fail;
 157                 }
 158                 if (*p) {
 159                         remaining = talloc_strdup(frame, p);
 160                         if (!remaining) {
 161                                 werr = WERR_NOMEM;
 162                                 goto fail;
 163                         }
 164                         p2 = remaining;
 165
 166                         if (!next_token_talloc(frame, &p2,
 167                                                 &subkeyname, "\\"))
 168                         {
 169                                 subkeyname = talloc_strdup(frame,p2);
 170                                 if (!subkeyname) {
 171                                         werr = WERR_NOMEM;
 172                                         goto fail;
 173                                 }
 174                         }
 175                 }
 176
 177                 DEBUG(10,("init_registry_key: Storing key [%s] with "
 178                           "subkey [%s]\n", base,
 179                           *subkeyname ? subkeyname : "NULL"));
 180
 181                 /* we don't really care if the lookup succeeds or not
 182                  * since we are about to update the record.
 183                  * We just want any subkeys already present */
 184
 185                 werr = regsubkey_ctr_init(frame, &subkeys);
 186                 if (!W_ERROR_IS_OK(werr)) {
 187                         DEBUG(0,("talloc() failure!\n"));
 188                         goto fail;
 189                 }
 190
 191                 werr = regdb_fetch_keys_internal(db, base, subkeys);
 192                 if (!W_ERROR_IS_OK(werr) &&
 193                     !W_ERROR_EQUAL(werr, WERR_NOT_FOUND))
 194                 {
 195                         goto fail;
 196                 }
 197
 198                 if (*subkeyname) {
 199                         werr = regsubkey_ctr_addkey(subkeys, subkeyname);
 200                         if (!W_ERROR_IS_OK(werr)) {
 201                                 goto fail;
 202                         }
 203                 }
 204                 if (!regdb_store_keys_internal(db, base, subkeys)) {
 205                         werr = WERR_CAN_NOT_COMPLETE;
 206                         goto fail;
 207                 }
 208         }
 209
 210         werr = WERR_OK;
 211
 212 fail:
 213         TALLOC_FREE(frame);
 214         return werr;
 215 }
 216
 217 struct init_registry_key_context {
 218         const char *add_path;
 219 };
 220
 221 static NTSTATUS init_registry_key_action(struct db_context *db,
 222                                          void *private_data)
 223 {
 224         struct init_registry_key_context *init_ctx =
 225                 (struct init_registry_key_context *)private_data;
 226
 227         return werror_to_ntstatus(init_registry_key_internal(
 228                                         db, init_ctx->add_path));
 229 }
 230
 231 /**
 232  * Initialize a key in the registry:
 233  * create each component key of the specified path,
 234  * wrapped in one db transaction.
 235  */
 236 WERROR init_registry_key(const char *add_path)
 237 {
 238         struct init_registry_key_context init_ctx;
 239
 240         if (regdb_key_exists(regdb, add_path)) {
 241                 return WERR_OK;
 242         }
 243
 244         init_ctx.add_path = add_path;
 245
 246         return ntstatus_to_werror(dbwrap_trans_do(regdb,
 247                                                   init_registry_key_action,
 248                                                   &init_ctx));
 249 }
 250
 251 /***********************************************************************
 252  Open the registry data in the tdb
 253  ***********************************************************************/
 254
 255 static void regdb_ctr_add_value(struct regval_ctr *ctr,
 256                                 struct builtin_regkey_value *value)
 257 {
 258         switch(value->type) {
 259         case REG_DWORD:
 260                 regval_ctr_addvalue(ctr, value->valuename, REG_DWORD,
 261                                     (uint8_t *)&value->data.dw_value,
 262                                     sizeof(uint32));
 263                 break;
 264
 265         case REG_SZ:
 266                 regval_ctr_addvalue_sz(ctr, value->valuename,
 267                                        value->data.string);
 268                 break;
 269
 270         default:
 271                 DEBUG(0, ("regdb_ctr_add_value: invalid value type in "
 272                           "registry values [%d]\n", value->type));
 273         }
 274 }
 275
 276 static NTSTATUS init_registry_data_action(struct db_context *db,
 277                                           void *private_data)
 278 {
 279         NTSTATUS status;
 280         TALLOC_CTX *frame = talloc_stackframe();
 281         struct regval_ctr *values;
 282         int i;
 283
 284         /* loop over all of the predefined paths and add each component */
 285
 286         for (i=0; builtin_registry_paths[i] != NULL; i++) {
 287                 if (regdb_key_exists(db, builtin_registry_paths[i])) {
 288                         continue;
 289                 }
 290                 status = werror_to_ntstatus(init_registry_key_internal(db,
 291                                                   builtin_registry_paths[i]));
 292                 if (!NT_STATUS_IS_OK(status)) {
 293                         goto done;
 294                 }
 295         }
 296
 297         /* loop over all of the predefined values and add each component */
 298
 299         for (i=0; builtin_registry_values[i].path != NULL; i++) {
 300                 WERROR werr;
 301
 302                 werr = regval_ctr_init(frame, &values);
 303                 if (!W_ERROR_IS_OK(werr)) {
 304                         status = werror_to_ntstatus(werr);
 305                         goto done;
 306                 }
 307
 308                 regdb_fetch_values_internal(db,
 309                                             builtin_registry_values[i].path,
 310                                             values);
 311
 312                 /* preserve existing values across restarts. Only add new ones */
 313
 314                 if (!regval_ctr_key_exists(values,
 315                                         builtin_registry_values[i].valuename))
 316                 {
 317                         regdb_ctr_add_value(values,
 318                                             &builtin_registry_values[i]);
 319                         regdb_store_values_internal(db,
 320                                         builtin_registry_values[i].path,
 321                                         values);
 322                 }
 323                 TALLOC_FREE(values);
 324         }
 325
 326         status = NT_STATUS_OK;
 327
 328 done:
 329
 330         TALLOC_FREE(frame);
 331         return status;
 332 }
 333
 334 WERROR init_registry_data(void)
 335 {
 336         WERROR werr;
 337         TALLOC_CTX *frame = talloc_stackframe();
 338         struct regval_ctr *values;
 339         int i;
 340
 341         /*
 342          * First, check for the existence of the needed keys and values.
 343          * If all do already exist, we can save the writes.
 344          */
 345         for (i=0; builtin_registry_paths[i] != NULL; i++) {
 346                 if (!regdb_key_exists(regdb, builtin_registry_paths[i])) {
 347                         goto do_init;
 348                 }
 349         }
 350
 351         for (i=0; builtin_registry_values[i].path != NULL; i++) {
 352                 werr = regval_ctr_init(frame, &values);
 353                 W_ERROR_NOT_OK_GOTO_DONE(werr);
 354
 355                 regdb_fetch_values_internal(regdb,
 356                                             builtin_registry_values[i].path,
 357                                             values);
 358                 if (!regval_ctr_key_exists(values,
 359                                         builtin_registry_values[i].valuename))
 360                 {
 361                         TALLOC_FREE(values);
 362                         goto do_init;
 363                 }
 364
 365                 TALLOC_FREE(values);
 366         }
 367
 368         werr = WERR_OK;
 369         goto done;
 370
 371 do_init:
 372
 373         /*
 374          * There are potentially quite a few store operations which are all
 375          * indiviually wrapped in tdb transactions. Wrapping them in a single
 376          * transaction gives just a single transaction_commit() to actually do
 377          * its fsync()s. See tdb/common/transaction.c for info about nested
 378          * transaction behaviour.
 379          */
 380
 381         werr = ntstatus_to_werror(dbwrap_trans_do(regdb,
 382                                                   init_registry_data_action,
 383                                                   NULL));
 384
 385 done:
 386         TALLOC_FREE(frame);
 387         return werr;
 388 }
 389
 390 /***********************************************************************
 391  Open the registry database
 392  ***********************************************************************/
 393
 394 WERROR regdb_init(void)
 395 {
 396         const char *vstring = "INFO/version";
 397         uint32 vers_id;
 398         WERROR werr;
 399
 400         if (regdb) {
 401                 DEBUG(10, ("regdb_init: incrementing refcount (%d)\n",
 402                           regdb_refcount));
 403                 regdb_refcount++;
 404                 return WERR_OK;
 405         }
 406
 407         regdb = db_open(NULL, state_path("registry.tdb"), 0,
 408                               REG_TDB_FLAGS, O_RDWR, 0600);
 409         if (!regdb) {
 410                 regdb = db_open(NULL, state_path("registry.tdb"), 0,
 411                                       REG_TDB_FLAGS, O_RDWR|O_CREAT, 0600);
 412                 if (!regdb) {
 413                         werr = ntstatus_to_werror(map_nt_error_from_unix(errno));
 414                         DEBUG(1,("regdb_init: Failed to open registry %s (%s)\n",
 415                                 state_path("registry.tdb"), strerror(errno) ));
 416                         return werr;
 417                 }
 418
 419                 DEBUG(10,("regdb_init: Successfully created registry tdb\n"));
 420         }
 421
 422         regdb_refcount = 1;
 423
 424         vers_id = dbwrap_fetch_int32(regdb, vstring);
 425
 426         if ( vers_id != REGVER_V1 ) {
 427                 NTSTATUS status;
 428                 /* any upgrade code here if needed */
 429                 DEBUG(10, ("regdb_init: got %s = %d != %d\n", vstring,
 430                            vers_id, REGVER_V1));
 431                 status = dbwrap_trans_store_int32(regdb, vstring, REGVER_V1);
 432                 if (!NT_STATUS_IS_OK(status)) {
 433                         DEBUG(1, ("regdb_init: error storing %s = %d: %s\n",
 434                                   vstring, REGVER_V1, nt_errstr(status)));
 435                         return ntstatus_to_werror(status);
 436                 } else {
 437                         DEBUG(10, ("regdb_init: stored %s = %d\n",
 438                                   vstring, REGVER_V1));
 439                 }
 440         }
 441
 442         return WERR_OK;
 443 }
 444
 445 /***********************************************************************
 446  Open the registry.  Must already have been initialized by regdb_init()
 447  ***********************************************************************/
 448
 449 WERROR regdb_open( void )
 450 {
 451         WERROR result = WERR_OK;
 452
 453         if ( regdb ) {
 454                 DEBUG(10,("regdb_open: incrementing refcount (%d)\n", regdb_refcount));
 455                 regdb_refcount++;
 456                 return WERR_OK;
 457         }
 458
 459         become_root();
 460
 461         regdb = db_open(NULL, state_path("registry.tdb"), 0,
 462                               REG_TDB_FLAGS, O_RDWR, 0600);
 463         if ( !regdb ) {
 464                 result = ntstatus_to_werror( map_nt_error_from_unix( errno ) );
 465                 DEBUG(0,("regdb_open: Failed to open %s! (%s)\n",
 466                         state_path("registry.tdb"), strerror(errno) ));
 467         }
 468
 469         unbecome_root();
 470
 471         regdb_refcount = 1;
 472         DEBUG(10,("regdb_open: refcount reset (%d)\n", regdb_refcount));
 473
 474         return result;
 475 }
 476
 477 /***********************************************************************
 478  ***********************************************************************/
 479
 480 int regdb_close( void )
 481 {
 482         if (regdb_refcount == 0) {
 483                 return 0;
 484         }
 485
 486         regdb_refcount--;
 487
 488         DEBUG(10,("regdb_close: decrementing refcount (%d)\n", regdb_refcount));
 489
 490         if ( regdb_refcount > 0 )
 491                 return 0;
 492
 493         SMB_ASSERT( regdb_refcount >= 0 );
 494
 495         TALLOC_FREE(regdb);
 496         return 0;
 497 }
 498
 499 WERROR regdb_transaction_start(void)
 500 {
 501         return (regdb->transaction_start(regdb) == 0) ?
 502                 WERR_OK : WERR_REG_IO_FAILURE;
 503 }
 504
 505 WERROR regdb_transaction_commit(void)
 506 {
 507         return (regdb->transaction_commit(regdb) == 0) ?
 508                 WERR_OK : WERR_REG_IO_FAILURE;
 509 }
 510
 511 WERROR regdb_transaction_cancel(void)
 512 {
 513         return (regdb->transaction_cancel(regdb) == 0) ?
 514                 WERR_OK : WERR_REG_IO_FAILURE;
 515 }
 516
 517 /***********************************************************************
 518  return the tdb sequence number of the registry tdb.
 519  this is an indicator for the content of the registry
 520  having changed. it will change upon regdb_init, too, though.
 521  ***********************************************************************/
 522 int regdb_get_seqnum(void)
 523 {
 524         return regdb->get_seqnum(regdb);
 525 }
 526
 527
 528 static WERROR regdb_delete_key_with_prefix(struct db_context *db,
 529                                            const char *keyname,
 530                                            const char *prefix)
 531 {
 532         char *path;
 533         WERROR werr = WERR_NOMEM;
 534         TALLOC_CTX *mem_ctx = talloc_stackframe();
 535
 536         if (keyname == NULL) {
 537                 werr = WERR_INVALID_PARAM;
 538                 goto done;
 539         }
 540
 541         if (prefix == NULL) {
 542                 path = discard_const_p(char, keyname);
 543         } else {
 544                 path = talloc_asprintf(mem_ctx, "%s/%s", prefix, keyname);
 545                 if (path == NULL) {
 546                         goto done;
 547                 }
 548         }
 549
 550         path = normalize_reg_path(mem_ctx, path);
 551         if (path == NULL) {
 552                 goto done;
 553         }
 554
 555         werr = ntstatus_to_werror(dbwrap_delete_bystring(db, path));
 556
 557         /* treat "not" found" as ok */
 558         if (W_ERROR_EQUAL(werr, WERR_NOT_FOUND)) {
 559                 werr = WERR_OK;
 560         }
 561
 562 done:
 563         talloc_free(mem_ctx);
 564         return werr;
 565 }
 566
 567
 568 static WERROR regdb_delete_values(struct db_context *db, const char *keyname)
 569 {
 570         return regdb_delete_key_with_prefix(db, keyname, REG_VALUE_PREFIX);
 571 }
 572
 573 static WERROR regdb_delete_secdesc(struct db_context *db, const char *keyname)
 574 {
 575         return regdb_delete_key_with_prefix(db, keyname, REG_SECDESC_PREFIX);
 576 }
 577
 578 static WERROR regdb_delete_subkeylist(struct db_context *db, const char *keyname)
 579 {
 580         return regdb_delete_key_with_prefix(db, keyname, NULL);
 581 }
 582
 583 static WERROR regdb_delete_key_lists(struct db_context *db, const char *keyname)
 584 {
 585         WERROR werr;
 586
 587         werr = regdb_delete_values(db, keyname);
 588         if (!W_ERROR_IS_OK(werr)) {
 589                 DEBUG(1, (__location__ " Deleting %s/%s failed: %s\n",
 590                           REG_VALUE_PREFIX, keyname, win_errstr(werr)));
 591                 goto done;
 592         }
 593
 594         werr = regdb_delete_secdesc(db, keyname);
 595         if (!W_ERROR_IS_OK(werr)) {
 596                 DEBUG(1, (__location__ " Deleting %s/%s failed: %s\n",
 597                           REG_SECDESC_PREFIX, keyname, win_errstr(werr)));
 598                 goto done;
 599         }
 600
 601         werr = regdb_delete_subkeylist(db, keyname);
 602         if (!W_ERROR_IS_OK(werr)) {
 603                 DEBUG(1, (__location__ " Deleting %s failed: %s\n",
 604                           keyname, win_errstr(werr)));
 605                 goto done;
 606         }
 607
 608 done:
 609         return werr;
 610 }
 611
 612 /***********************************************************************
 613  Add subkey strings to the registry tdb under a defined key
 614  fmt is the same format as tdb_pack except this function only supports
 615  fstrings
 616  ***********************************************************************/
 617
 618 static WERROR regdb_store_keys_internal2(struct db_context *db,
 619                                          const char *key,
 620                                          struct regsubkey_ctr *ctr)
 621 {
 622         TDB_DATA dbuf;
 623         uint8 *buffer = NULL;
 624         int i = 0;
 625         uint32 len, buflen;
 626         uint32 num_subkeys = regsubkey_ctr_numkeys(ctr);
 627         char *keyname = NULL;
 628         TALLOC_CTX *ctx = talloc_stackframe();
 629         WERROR werr;
 630
 631         if (!key) {
 632                 werr = WERR_INVALID_PARAM;
 633                 goto done;
 634         }
 635
 636         keyname = talloc_strdup(ctx, key);
 637         if (!keyname) {
 638                 werr = WERR_NOMEM;
 639                 goto done;
 640         }
 641
 642         keyname = normalize_reg_path(ctx, keyname);
 643         if (!keyname) {
 644                 werr = WERR_NOMEM;
 645                 goto done;
 646         }
 647
 648         /* allocate some initial memory */
 649
 650         buffer = (uint8 *)SMB_MALLOC(1024);
 651         if (buffer == NULL) {
 652                 werr = WERR_NOMEM;
 653                 goto done;
 654         }
 655         buflen = 1024;
 656         len = 0;
 657
 658         /* store the number of subkeys */
 659
 660         len += tdb_pack(buffer+len, buflen-len, "d", num_subkeys);
 661
 662         /* pack all the strings */
 663
 664         for (i=0; i<num_subkeys; i++) {
 665                 size_t thistime;
 666
 667                 thistime = tdb_pack(buffer+len, buflen-len, "f",
 668                                     regsubkey_ctr_specific_key(ctr, i));
 669                 if (len+thistime > buflen) {
 670                         size_t thistime2;
 671                         /*
 672                          * tdb_pack hasn't done anything because of the short
 673                          * buffer, allocate extra space.
 674                          */
 675                         buffer = SMB_REALLOC_ARRAY(buffer, uint8_t,
 676                                                    (len+thistime)*2);
 677                         if(buffer == NULL) {
 678                                 DEBUG(0, ("regdb_store_keys: Failed to realloc "
 679                                           "memory of size [%u]\n",
 680                                           (unsigned int)(len+thistime)*2));
 681                                 werr = WERR_NOMEM;
 682                                 goto done;
 683                         }
 684                         buflen = (len+thistime)*2;
 685                         thistime2 = tdb_pack(
 686                                 buffer+len, buflen-len, "f",
 687                                 regsubkey_ctr_specific_key(ctr, i));
 688                         if (thistime2 != thistime) {
 689                                 DEBUG(0, ("tdb_pack failed\n"));
 690                                 werr = WERR_CAN_NOT_COMPLETE;
 691                                 goto done;
 692                         }
 693                 }
 694                 len += thistime;
 695         }
 696
 697         /* finally write out the data */
 698
 699         dbuf.dptr = buffer;
 700         dbuf.dsize = len;
 701         werr = ntstatus_to_werror(dbwrap_store_bystring(db, keyname, dbuf,
 702                                                         TDB_REPLACE));
 703         W_ERROR_NOT_OK_GOTO_DONE(werr);
 704
 705         /*
 706          * Delete a sorted subkey cache for regdb_key_exists, will be
 707          * recreated automatically
 708          */
 709         keyname = talloc_asprintf(ctx, "%s/%s", REG_SORTED_SUBKEYS_PREFIX,
 710                                   keyname);
 711         if (keyname == NULL) {
 712                 werr = WERR_NOMEM;
 713                 goto done;
 714         }
 715
 716         werr = ntstatus_to_werror(dbwrap_delete_bystring(db, keyname));
 717
 718         /* don't treat WERR_NOT_FOUND as an error here */
 719         if (W_ERROR_EQUAL(werr, WERR_NOT_FOUND)) {
 720                 werr = WERR_OK;
 721         }
 722
 723 done:
 724         TALLOC_FREE(ctx);
 725         SAFE_FREE(buffer);
 726         return werr;
 727 }
 728
 729 /***********************************************************************
 730  Store the new subkey record and create any child key records that
 731  do not currently exist
 732  ***********************************************************************/
 733
 734 struct regdb_store_keys_context {
 735         const char *key;
 736         struct regsubkey_ctr *ctr;
 737 };
 738
 739 static NTSTATUS regdb_store_keys_action(struct db_context *db,
 740                                         void *private_data)
 741 {
 742         struct regdb_store_keys_context *store_ctx;
 743         WERROR werr;
 744         int num_subkeys, i;
 745         char *path = NULL;
 746         struct regsubkey_ctr *subkeys = NULL, *old_subkeys = NULL;
 747         char *oldkeyname = NULL;
 748         TALLOC_CTX *mem_ctx = talloc_stackframe();
 749
 750         store_ctx = (struct regdb_store_keys_context *)private_data;
 751
 752         /*
 753          * Re-fetch the old keys inside the transaction
 754          */
 755
 756         werr = regsubkey_ctr_init(mem_ctx, &old_subkeys);
 757         W_ERROR_NOT_OK_GOTO_DONE(werr);
 758
 759         werr = regdb_fetch_keys_internal(db, store_ctx->key, old_subkeys);
 760         if (!W_ERROR_IS_OK(werr) &&
 761             !W_ERROR_EQUAL(werr, WERR_NOT_FOUND))
 762         {
 763                 goto done;
 764         }
 765
 766         /*
 767          * Make the store operation as safe as possible without transactions:
 768          *
 769          * (1) For each subkey removed from ctr compared with old_subkeys:
 770          *
 771          *     (a) First delete the value db entry.
 772          *
 773          *     (b) Next delete the secdesc db record.
 774          *
 775          *     (c) Then delete the subkey list entry.
 776          *
 777          * (2) Now write the list of subkeys of the parent key,
 778          *     deleting removed entries and adding new ones.
 779          *
 780          * (3) Finally create the subkey list entries for the added keys.
 781          *
 782          * This way if we crash half-way in between deleting the subkeys
 783          * and storing the parent's list of subkeys, no old data can pop up
 784          * out of the blue when re-adding keys later on.
 785          */
 786
 787         /* (1) delete removed keys' lists (values/secdesc/subkeys) */
 788
 789         num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
 790         for (i=0; i<num_subkeys; i++) {
 791                 oldkeyname = regsubkey_ctr_specific_key(old_subkeys, i);
 792
 793                 if (regsubkey_ctr_key_exists(store_ctx->ctr, oldkeyname)) {
 794                         /*
 795                          * It's still around, don't delete
 796                          */
 797                         continue;
 798                 }
 799
 800                 path = talloc_asprintf(mem_ctx, "%s/%s", store_ctx->key,
 801                                        oldkeyname);
 802                 if (!path) {
 803                         werr = WERR_NOMEM;
 804                         goto done;
 805                 }
 806
 807                 werr = regdb_delete_key_lists(db, path);
 808                 W_ERROR_NOT_OK_GOTO_DONE(werr);
 809
 810                 TALLOC_FREE(path);
 811         }
 812
 813         TALLOC_FREE(old_subkeys);
 814
 815         /* (2) store the subkey list for the parent */
 816
 817         werr = regdb_store_keys_internal2(db, store_ctx->key, store_ctx->ctr);
 818         if (!W_ERROR_IS_OK(werr)) {
 819                 DEBUG(0,("regdb_store_keys: Failed to store new subkey list "
 820                          "for parent [%s]: %s\n", store_ctx->key,
 821                          win_errstr(werr)));
 822                 goto done;
 823         }
 824
 825         /* (3) now create records for any subkeys that don't already exist */
 826
 827         num_subkeys = regsubkey_ctr_numkeys(store_ctx->ctr);
 828
 829         if (num_subkeys == 0) {
 830                 werr = regsubkey_ctr_init(mem_ctx, &subkeys);
 831                 W_ERROR_NOT_OK_GOTO_DONE(werr);
 832
 833                 werr = regdb_store_keys_internal2(db, store_ctx->key, subkeys);
 834                 if (!W_ERROR_IS_OK(werr)) {
 835                         DEBUG(0,("regdb_store_keys: Failed to store "
 836                                  "new record for key [%s]: %s\n",
 837                                  store_ctx->key, win_errstr(werr)));
 838                         goto done;
 839                 }
 840                 TALLOC_FREE(subkeys);
 841         }
 842
 843         for (i=0; i<num_subkeys; i++) {
 844                 path = talloc_asprintf(mem_ctx, "%s/%s", store_ctx->key,
 845                                 regsubkey_ctr_specific_key(store_ctx->ctr, i));
 846                 if (!path) {
 847                         werr = WERR_NOMEM;
 848                         goto done;
 849                 }
 850                 werr = regsubkey_ctr_init(mem_ctx, &subkeys);
 851                 W_ERROR_NOT_OK_GOTO_DONE(werr);
 852
 853                 werr = regdb_fetch_keys_internal(db, path, subkeys);
 854                 if (!W_ERROR_IS_OK(werr)) {
 855                         /* create a record with 0 subkeys */
 856                         werr = regdb_store_keys_internal2(db, path, subkeys);
 857                         if (!W_ERROR_IS_OK(werr)) {
 858                                 DEBUG(0,("regdb_store_keys: Failed to store "
 859                                          "new record for key [%s]: %s\n", path,
 860                                          win_errstr(werr)));
 861                                 goto done;
 862                         }
 863                 }
 864
 865                 TALLOC_FREE(subkeys);
 866                 TALLOC_FREE(path);
 867         }
 868
 869         werr = WERR_OK;
 870
 871 done:
 872         talloc_free(mem_ctx);
 873         return werror_to_ntstatus(werr);
 874 }
 875
 876 static bool regdb_store_keys_internal(struct db_context *db, const char *key,
 877                                       struct regsubkey_ctr *ctr)
 878 {
 879         int num_subkeys, old_num_subkeys, i;
 880         struct regsubkey_ctr *old_subkeys = NULL;
 881         TALLOC_CTX *ctx = talloc_stackframe();
 882         WERROR werr;
 883         bool ret = false;
 884         struct regdb_store_keys_context store_ctx;
 885
 886         if (!regdb_key_is_base_key(key) && !regdb_key_exists(db, key)) {
 887                 goto done;
 888         }
 889
 890         /*
 891          * fetch a list of the old subkeys so we can determine if anything has
 892          * changed
 893          */
 894
 895         werr = regsubkey_ctr_init(ctx, &old_subkeys);
 896         if (!W_ERROR_IS_OK(werr)) {
 897                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 898                 goto done;
 899         }
 900
 901         werr = regdb_fetch_keys_internal(db, key, old_subkeys);
 902         if (!W_ERROR_IS_OK(werr) &&
 903             !W_ERROR_EQUAL(werr, WERR_NOT_FOUND))
 904         {
 905                 goto done;
 906         }
 907
 908         num_subkeys = regsubkey_ctr_numkeys(ctr);
 909         old_num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
 910         if ((num_subkeys && old_num_subkeys) &&
 911             (num_subkeys == old_num_subkeys)) {
 912
 913                 for (i = 0; i < num_subkeys; i++) {
 914                         if (strcmp(regsubkey_ctr_specific_key(ctr, i),
 915                                    regsubkey_ctr_specific_key(old_subkeys, i))
 916                             != 0)
 917                         {
 918                                 break;
 919                         }
 920                 }
 921                 if (i == num_subkeys) {
 922                         /*
 923                          * Nothing changed, no point to even start a tdb
 924                          * transaction
 925                          */
 926
 927                         ret = true;
 928                         goto done;
 929                 }
 930         }
 931
 932         TALLOC_FREE(old_subkeys);
 933
 934         store_ctx.key = key;
 935         store_ctx.ctr = ctr;
 936
 937         werr = ntstatus_to_werror(dbwrap_trans_do(db,
 938                                                   regdb_store_keys_action,
 939                                                   &store_ctx));
 940
 941         ret = W_ERROR_IS_OK(werr);
 942
 943 done:
 944         TALLOC_FREE(ctx);
 945
 946         return ret;
 947 }
 948
 949 bool regdb_store_keys(const char *key, struct regsubkey_ctr *ctr)
 950 {
 951         return regdb_store_keys_internal(regdb, key, ctr);
 952 }
 953
 954 /**
 955  * create a subkey of a given key
 956  */
 957
 958 struct regdb_create_subkey_context {
 959         const char *key;
 960         const char *subkey;
 961 };
 962
 963 static NTSTATUS regdb_create_subkey_action(struct db_context *db,
 964                                            void *private_data)
 965 {
 966         WERROR werr;
 967         struct regdb_create_subkey_context *create_ctx;
 968         struct regsubkey_ctr *subkeys;
 969         TALLOC_CTX *mem_ctx = talloc_stackframe();
 970
 971         create_ctx = (struct regdb_create_subkey_context *)private_data;
 972
 973         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
 974         W_ERROR_NOT_OK_GOTO_DONE(werr);
 975
 976         werr = regdb_fetch_keys_internal(db, create_ctx->key, subkeys);
 977         W_ERROR_NOT_OK_GOTO_DONE(werr);
 978
 979         werr = regsubkey_ctr_addkey(subkeys, create_ctx->subkey);
 980         W_ERROR_NOT_OK_GOTO_DONE(werr);
 981
 982         werr = regdb_store_keys_internal2(db, create_ctx->key, subkeys);
 983         if (!W_ERROR_IS_OK(werr)) {
 984                 DEBUG(0, (__location__ " failed to store new subkey list for "
 985                          "parent key %s: %s\n", create_ctx->key,
 986                          win_errstr(werr)));
 987         }
 988
 989 done:
 990         talloc_free(mem_ctx);
 991         return werror_to_ntstatus(werr);
 992 }
 993
 994 static WERROR regdb_create_subkey(const char *key, const char *subkey)
 995 {
 996         WERROR werr;
 997         struct regsubkey_ctr *subkeys;
 998         TALLOC_CTX *mem_ctx = talloc_stackframe();
 999         struct regdb_create_subkey_context create_ctx;
1000
1001         if (!regdb_key_is_base_key(key) && !regdb_key_exists(regdb, key)) {
1002                 werr = WERR_NOT_FOUND;
1003                 goto done;
1004         }
1005
1006         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
1007         W_ERROR_NOT_OK_GOTO_DONE(werr);
1008
1009         werr = regdb_fetch_keys_internal(regdb, key, subkeys);
1010         W_ERROR_NOT_OK_GOTO_DONE(werr);
1011
1012         if (regsubkey_ctr_key_exists(subkeys, subkey)) {
1013                 werr = WERR_OK;
1014                 goto done;
1015         }
1016
1017         talloc_free(subkeys);
1018
1019         create_ctx.key = key;
1020         create_ctx.subkey = subkey;
1021
1022         werr = ntstatus_to_werror(dbwrap_trans_do(regdb,
1023                                                   regdb_create_subkey_action,
1024                                                   &create_ctx));
1025
1026 done:
1027         talloc_free(mem_ctx);
1028         return werr;
1029 }
1030
1031 /**
1032  * create a subkey of a given key
1033  */
1034
1035 struct regdb_delete_subkey_context {
1036         const char *key;
1037         const char *subkey;
1038         const char *path;
1039 };
1040
1041 static NTSTATUS regdb_delete_subkey_action(struct db_context *db,
1042                                            void *private_data)
1043 {
1044         WERROR werr;
1045         struct regdb_delete_subkey_context *delete_ctx;
1046         struct regsubkey_ctr *subkeys;
1047         TALLOC_CTX *mem_ctx = talloc_stackframe();
1048
1049         delete_ctx = (struct regdb_delete_subkey_context *)private_data;
1050
1051         werr = regdb_delete_key_lists(db, delete_ctx->path);
1052         W_ERROR_NOT_OK_GOTO_DONE(werr);
1053
1054         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
1055         W_ERROR_NOT_OK_GOTO_DONE(werr);
1056
1057         werr = regdb_fetch_keys_internal(db, delete_ctx->key, subkeys);
1058         W_ERROR_NOT_OK_GOTO_DONE(werr);
1059
1060         werr = regsubkey_ctr_delkey(subkeys, delete_ctx->subkey);
1061         W_ERROR_NOT_OK_GOTO_DONE(werr);
1062
1063         werr = regdb_store_keys_internal2(db, delete_ctx->key, subkeys);
1064         if (!W_ERROR_IS_OK(werr)) {
1065                 DEBUG(0, (__location__ " failed to store new subkey_list for "
1066                          "parent key %s: %s\n", delete_ctx->key,
1067                          win_errstr(werr)));
1068         }
1069
1070 done:
1071         talloc_free(mem_ctx);
1072         return werror_to_ntstatus(werr);
1073 }
1074
1075 static WERROR regdb_delete_subkey(const char *key, const char *subkey)
1076 {
1077         WERROR werr;
1078         char *path;
1079         struct regdb_delete_subkey_context delete_ctx;
1080         TALLOC_CTX *mem_ctx = talloc_stackframe();
1081
1082         if (!regdb_key_is_base_key(key) && !regdb_key_exists(regdb, key)) {
1083                 werr = WERR_NOT_FOUND;
1084                 goto done;
1085         }
1086
1087         path = talloc_asprintf(mem_ctx, "%s/%s", key, subkey);
1088         if (path == NULL) {
1089                 werr = WERR_NOMEM;
1090                 goto done;
1091         }
1092
1093         if (!regdb_key_exists(regdb, path)) {
1094                 werr = WERR_OK;
1095                 goto done;
1096         }
1097
1098         delete_ctx.key = key;
1099         delete_ctx.subkey = subkey;
1100         delete_ctx.path = path;
1101
1102         werr = ntstatus_to_werror(dbwrap_trans_do(regdb,
1103                                                   regdb_delete_subkey_action,
1104                                                   &delete_ctx));
1105
1106 done:
1107         talloc_free(mem_ctx);
1108         return werr;
1109 }
1110
1111 static TDB_DATA regdb_fetch_key_internal(struct db_context *db,
1112                                          TALLOC_CTX *mem_ctx, const char *key)
1113 {
1114         char *path = NULL;
1115         TDB_DATA data;
1116
1117         path = normalize_reg_path(mem_ctx, key);
1118         if (!path) {
1119                 return make_tdb_data(NULL, 0);
1120         }
1121
1122         data = dbwrap_fetch_bystring(db, mem_ctx, path);
1123
1124         TALLOC_FREE(path);
1125         return data;
1126 }
1127
1128
1129 /**
1130  * check whether a given key name represents a base key,
1131  * i.e one without a subkey separator ('/' or '\').
1132  */
1133 static bool regdb_key_is_base_key(const char *key)
1134 {
1135         TALLOC_CTX *mem_ctx = talloc_stackframe();
1136         bool ret = false;
1137         char *path;
1138
1139         if (key == NULL) {
1140                 goto done;
1141         }
1142
1143         path = normalize_reg_path(mem_ctx, key);
1144         if (path == NULL) {
1145                 DEBUG(0, ("out of memory! (talloc failed)\n"));
1146                 goto done;
1147         }
1148
1149         if (*path == '\0') {
1150                 goto done;
1151         }
1152
1153         ret = (strrchr(path, '/') == NULL);
1154
1155 done:
1156         TALLOC_FREE(mem_ctx);
1157         return ret;
1158 }
1159
1160 /*
1161  * regdb_key_exists() is a very frequent operation. It can be quite
1162  * time-consuming to fully fetch the parent's subkey list, talloc_strdup all
1163  * subkeys and then compare the keyname linearly to all the parent's subkeys.
1164  *
1165  * The following code tries to make this operation as efficient as possible:
1166  * Per registry key we create a list of subkeys that is very efficient to
1167  * search for existence of a subkey. Its format is:
1168  *
1169  * 4 bytes num_subkeys
1170  * 4*num_subkey bytes offset into the string array
1171  * then follows a sorted list of subkeys in uppercase
1172  *
1173  * This record is created by create_sorted_subkeys() on demand if it does not
1174  * exist. scan_parent_subkeys() uses regdb->parse_record to search the sorted
1175  * list, the parsing code and the binary search can be found in
1176  * parent_subkey_scanner. The code uses parse_record() to avoid a memcpy of
1177  * the potentially large subkey record.
1178  *
1179  * The sorted subkey record is deleted in regdb_store_keys_internal2 and
1180  * recreated on demand.
1181  */
1182
1183 static int cmp_keynames(char **p1, char **p2)
1184 {
1185         return StrCaseCmp(*p1, *p2);
1186 }
1187
1188 struct create_sorted_subkeys_context {
1189         const char *key;
1190         const char *sorted_keyname;
1191 };
1192
1193 static NTSTATUS create_sorted_subkeys_action(struct db_context *db,
1194                                              void *private_data)
1195 {
1196         char **sorted_subkeys;
1197         struct regsubkey_ctr *ctr;
1198         NTSTATUS status;
1199         char *buf;
1200         char *p;
1201         int i;
1202         size_t len;
1203         int num_subkeys;
1204         struct create_sorted_subkeys_context *sorted_ctx;
1205
1206         sorted_ctx = (struct create_sorted_subkeys_context *)private_data;
1207
1208         /*
1209          * In this function, we only treat failing of the actual write to
1210          * the db as a real error. All preliminary errors, at a stage when
1211          * nothing has been written to the DB yet are treated as success
1212          * to be committed (as an empty transaction).
1213          *
1214          * The reason is that this (disposable) call might be nested in other
1215          * transactions. Doing a cancel here would destroy the possibility of
1216          * a transaction_commit for transactions that we might be wrapped in.
1217          */
1218
1219         status = werror_to_ntstatus(regsubkey_ctr_init(talloc_tos(), &ctr));
1220         if (!NT_STATUS_IS_OK(status)) {
1221                 /* don't treat this as an error */
1222                 status = NT_STATUS_OK;
1223                 goto done;
1224         }
1225
1226         status = werror_to_ntstatus(regdb_fetch_keys_internal(db,
1227                                                               sorted_ctx->key,
1228                                                               ctr));
1229         if (!NT_STATUS_IS_OK(status)) {
1230                 /* don't treat this as an error */
1231                 status = NT_STATUS_OK;
1232                 goto done;
1233         }
1234
1235         num_subkeys = regsubkey_ctr_numkeys(ctr);
1236         sorted_subkeys = talloc_array(ctr, char *, num_subkeys);
1237         if (sorted_subkeys == NULL) {
1238                 /* don't treat this as an error */
1239                 goto done;
1240         }
1241
1242         len = 4 + 4*num_subkeys;
1243
1244         for (i = 0; i < num_subkeys; i++) {
1245                 sorted_subkeys[i] = talloc_strdup_upper(sorted_subkeys,
1246                                         regsubkey_ctr_specific_key(ctr, i));
1247                 if (sorted_subkeys[i] == NULL) {
1248                         /* don't treat this as an error */
1249                         goto done;
1250                 }
1251                 len += strlen(sorted_subkeys[i])+1;
1252         }
1253
1254         TYPESAFE_QSORT(sorted_subkeys, num_subkeys, cmp_keynames);
1255
1256         buf = talloc_array(ctr, char, len);
1257         if (buf == NULL) {
1258                 /* don't treat this as an error */
1259                 goto done;
1260         }
1261         p = buf + 4 + 4*num_subkeys;
1262
1263         SIVAL(buf, 0, num_subkeys);
1264
1265         for (i=0; i < num_subkeys; i++) {
1266                 ptrdiff_t offset = p - buf;
1267                 SIVAL(buf, 4 + 4*i, offset);
1268                 strlcpy(p, sorted_subkeys[i], len-offset);
1269                 p += strlen(sorted_subkeys[i]) + 1;
1270         }
1271
1272         status = dbwrap_store_bystring(
1273                 db, sorted_ctx->sorted_keyname, make_tdb_data((uint8_t *)buf,
1274                 len),
1275                 TDB_REPLACE);
1276
1277 done:
1278         talloc_free(ctr);
1279         return status;
1280 }
1281
1282 static bool create_sorted_subkeys(const char *key, const char *sorted_keyname)
1283 {
1284         NTSTATUS status;
1285         struct create_sorted_subkeys_context sorted_ctx;
1286
1287         sorted_ctx.key = key;
1288         sorted_ctx.sorted_keyname = sorted_keyname;
1289
1290         status = dbwrap_trans_do(regdb,
1291                                  create_sorted_subkeys_action,
1292                                  &sorted_ctx);
1293
1294         return NT_STATUS_IS_OK(status);
1295 }
1296
1297 struct scan_subkey_state {
1298         char *name;
1299         bool scanned;
1300         bool found;
1301 };
1302
1303 static int parent_subkey_scanner(TDB_DATA key, TDB_DATA data,
1304                                  void *private_data)
1305 {
1306         struct scan_subkey_state *state =
1307                 (struct scan_subkey_state *)private_data;
1308         uint32_t num_subkeys;
1309         uint32_t l, u;
1310
1311         if (data.dsize < sizeof(uint32_t)) {
1312                 return -1;
1313         }
1314
1315         state->scanned = true;
1316         state->found = false;
1317
1318         tdb_unpack(data.dptr, data.dsize, "d", &num_subkeys);
1319
1320         l = 0;
1321         u = num_subkeys;
1322
1323         while (l < u) {
1324                 uint32_t idx = (l+u)/2;
1325                 char *s = (char *)data.dptr + IVAL(data.dptr, 4 + 4*idx);
1326                 int comparison = strcmp(state->name, s);
1327
1328                 if (comparison < 0) {
1329                         u = idx;
1330                 } else if (comparison > 0) {
1331                         l = idx + 1;
1332                 } else {
1333                         state->found = true;
1334                         return 0;
1335                 }
1336         }
1337         return 0;
1338 }
1339
1340 static bool scan_parent_subkeys(struct db_context *db, const char *parent,
1341                                 const char *name)
1342 {
1343         char *path = NULL;
1344         char *key = NULL;
1345         struct scan_subkey_state state = { 0, };
1346         bool result = false;
1347         int res;
1348
1349         state.name = NULL;
1350
1351         path = normalize_reg_path(talloc_tos(), parent);
1352         if (path == NULL) {
1353                 goto fail;
1354         }
1355
1356         key = talloc_asprintf(talloc_tos(), "%s/%s",
1357                               REG_SORTED_SUBKEYS_PREFIX, path);
1358         if (key == NULL) {
1359                 goto fail;
1360         }
1361
1362         state.name = talloc_strdup_upper(talloc_tos(), name);
1363         if (state.name == NULL) {
1364                 goto fail;
1365         }
1366         state.scanned = false;
1367
1368         res = db->parse_record(db, string_term_tdb_data(key),
1369                                parent_subkey_scanner, &state);
1370
1371         if (state.scanned) {
1372                 result = state.found;
1373         } else {
1374                 res = db->transaction_start(db);
1375                 if (res != 0) {
1376                         DEBUG(0, ("error starting transacion\n"));
1377                         goto fail;
1378                 }
1379
1380                 if (!create_sorted_subkeys(path, key)) {
1381                         res = db->transaction_cancel(db);
1382                         if (res != 0) {
1383                                 smb_panic("Failed to cancel transaction.");
1384                         }
1385                         goto fail;
1386                 }
1387
1388                 res = db->parse_record(db, string_term_tdb_data(key),
1389                                        parent_subkey_scanner, &state);
1390                 if ((res == 0) && (state.scanned)) {
1391                         result = state.found;
1392                 }
1393
1394                 res = db->transaction_commit(db);
1395                 if (res != 0) {
1396                         DEBUG(0, ("error committing transaction\n"));
1397                         result = false;
1398                 }
1399         }
1400
1401  fail:
1402         TALLOC_FREE(path);
1403         TALLOC_FREE(state.name);
1404         return result;
1405 }
1406
1407 /**
1408  * Check for the existence of a key.
1409  *
1410  * Existence of a key is authoritatively defined by its
1411  * existence in the list of subkeys of its parent key.
1412  * The exeption of this are keys without a parent key,
1413  * i.e. the "base" keys (HKLM, HKCU, ...).
1414  */
1415 static bool regdb_key_exists(struct db_context *db, const char *key)
1416 {
1417         TALLOC_CTX *mem_ctx = talloc_stackframe();
1418         TDB_DATA value;
1419         bool ret = false;
1420         char *path, *p;
1421
1422         if (key == NULL) {
1423                 goto done;
1424         }
1425
1426         path = normalize_reg_path(mem_ctx, key);
1427         if (path == NULL) {
1428                 DEBUG(0, ("out of memory! (talloc failed)\n"));
1429                 goto done;
1430         }
1431
1432         if (*path == '\0') {
1433                 goto done;
1434         }
1435
1436         p = strrchr(path, '/');
1437         if (p == NULL) {
1438                 /* this is a base key */
1439                 value = regdb_fetch_key_internal(db, mem_ctx, path);
1440                 ret = (value.dptr != NULL);
1441         } else {
1442                 *p = '\0';
1443                 ret = scan_parent_subkeys(db, path, p+1);
1444         }
1445
1446 done:
1447         TALLOC_FREE(mem_ctx);
1448         return ret;
1449 }
1450
1451
1452 /***********************************************************************
1453  Retrieve an array of strings containing subkeys.  Memory should be
1454  released by the caller.
1455  ***********************************************************************/
1456
1457 static WERROR regdb_fetch_keys_internal(struct db_context *db, const char *key,
1458                                         struct regsubkey_ctr *ctr)
1459 {
1460         WERROR werr;
1461         uint32_t num_items;
1462         uint8 *buf;
1463         uint32 buflen, len;
1464         int i;
1465         fstring subkeyname;
1466         TALLOC_CTX *frame = talloc_stackframe();
1467         TDB_DATA value;
1468
1469         DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL"));
1470
1471         frame = talloc_stackframe();
1472
1473         if (!regdb_key_exists(db, key)) {
1474                 DEBUG(10, ("key [%s] not found\n", key));
1475                 werr = WERR_NOT_FOUND;
1476                 goto done;
1477         }
1478
1479         werr = regsubkey_ctr_set_seqnum(ctr, db->get_seqnum(db));
1480         W_ERROR_NOT_OK_GOTO_DONE(werr);
1481
1482         value = regdb_fetch_key_internal(db, frame, key);
1483
1484         if (value.dsize == 0 || value.dptr == NULL) {
1485                 DEBUG(10, ("regdb_fetch_keys: no subkeys found for key [%s]\n",
1486                            key));
1487                 goto done;
1488         }
1489
1490         buf = value.dptr;
1491         buflen = value.dsize;
1492         len = tdb_unpack( buf, buflen, "d", &num_items);
1493         if (len == (uint32_t)-1) {
1494                 werr = WERR_NOT_FOUND;
1495                 goto done;
1496         }
1497
1498         werr = regsubkey_ctr_reinit(ctr);
1499         W_ERROR_NOT_OK_GOTO_DONE(werr);
1500
1501         for (i=0; i<num_items; i++) {
1502                 len += tdb_unpack(buf+len, buflen-len, "f", subkeyname);
1503                 werr = regsubkey_ctr_addkey(ctr, subkeyname);
1504                 if (!W_ERROR_IS_OK(werr)) {
1505                         DEBUG(5, ("regdb_fetch_keys: regsubkey_ctr_addkey "
1506                                   "failed: %s\n", win_errstr(werr)));
1507                         num_items = 0;
1508                         goto done;
1509                 }
1510         }
1511
1512         DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items));
1513
1514 done:
1515         TALLOC_FREE(frame);
1516         return werr;
1517 }
1518
1519 int regdb_fetch_keys(const char *key, struct regsubkey_ctr *ctr)
1520 {
1521         WERROR werr;
1522
1523         werr = regdb_fetch_keys_internal(regdb, key, ctr);
1524         if (!W_ERROR_IS_OK(werr)) {
1525                 return -1;
1526         }
1527
1528         return regsubkey_ctr_numkeys(ctr);
1529 }
1530
1531 /****************************************************************************
1532  Unpack a list of registry values frem the TDB
1533  ***************************************************************************/
1534
1535 static int regdb_unpack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1536 {
1537         int             len = 0;
1538         uint32          type;
1539         fstring valuename;
1540         uint32          size;
1541         uint8           *data_p;
1542         uint32          num_values = 0;
1543         int             i;
1544
1545         /* loop and unpack the rest of the registry values */
1546
1547         len += tdb_unpack(buf+len, buflen-len, "d", &num_values);
1548
1549         for ( i=0; i<num_values; i++ ) {
1550                 /* unpack the next regval */
1551
1552                 type = REG_NONE;
1553                 size = 0;
1554                 data_p = NULL;
1555                 valuename[0] = '\0';
1556                 len += tdb_unpack(buf+len, buflen-len, "fdB",
1557                                   valuename,
1558                                   &type,
1559                                   &size,
1560                                   &data_p);
1561
1562                 /* add the new value. Paranoid protective code -- make sure data_p is valid */
1563
1564                 if (size && data_p) {
1565                         regval_ctr_addvalue(values, valuename, type,
1566                                         (uint8_t *)data_p, size);
1567                 }
1568                 SAFE_FREE(data_p); /* 'B' option to tdb_unpack does a malloc() */
1569
1570                 DEBUG(8,("specific: [%s], len: %d\n", valuename, size));
1571         }
1572
1573         return len;
1574 }
1575
1576 /****************************************************************************
1577  Pack all values in all printer keys
1578  ***************************************************************************/
1579
1580 static int regdb_pack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1581 {
1582         int             len = 0;
1583         int             i;
1584         struct regval_blob      *val;
1585         int             num_values;
1586
1587         if ( !values )
1588                 return 0;
1589
1590         num_values = regval_ctr_numvals( values );
1591
1592         /* pack the number of values first */
1593
1594         len += tdb_pack( buf+len, buflen-len, "d", num_values );
1595
1596         /* loop over all values */
1597
1598         for ( i=0; i<num_values; i++ ) {
1599                 val = regval_ctr_specific_value( values, i );
1600                 len += tdb_pack(buf+len, buflen-len, "fdB",
1601                                 regval_name(val),
1602                                 regval_type(val),
1603                                 regval_size(val),
1604                                 regval_data_p(val) );
1605         }
1606
1607         return len;
1608 }
1609
1610 /***********************************************************************
1611  Retrieve an array of strings containing subkeys.  Memory should be
1612  released by the caller.
1613  ***********************************************************************/
1614
1615 static int regdb_fetch_values_internal(struct db_context *db, const char* key,
1616                                        struct regval_ctr *values)
1617 {
1618         char *keystr = NULL;
1619         TALLOC_CTX *ctx = talloc_stackframe();
1620         int ret = 0;
1621         TDB_DATA value;
1622         WERROR werr;
1623
1624         DEBUG(10,("regdb_fetch_values: Looking for value of key [%s] \n", key));
1625
1626         if (!regdb_key_exists(db, key)) {
1627                 goto done;
1628         }
1629
1630         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key);
1631         if (!keystr) {
1632                 goto done;
1633         }
1634
1635         werr = regval_ctr_set_seqnum(values, db->get_seqnum(db));
1636         W_ERROR_NOT_OK_GOTO_DONE(werr);
1637
1638         value = regdb_fetch_key_internal(db, ctx, keystr);
1639
1640         if (!value.dptr) {
1641                 /* all keys have zero values by default */
1642                 goto done;
1643         }
1644
1645         regdb_unpack_values(values, value.dptr, value.dsize);
1646         ret = regval_ctr_numvals(values);
1647
1648 done:
1649         TALLOC_FREE(ctx);
1650         return ret;
1651 }
1652
1653 int regdb_fetch_values(const char* key, struct regval_ctr *values)
1654 {
1655         return regdb_fetch_values_internal(regdb, key, values);
1656 }
1657
1658 static bool regdb_store_values_internal(struct db_context *db, const char *key,
1659                                         struct regval_ctr *values)
1660 {
1661         TDB_DATA old_data, data;
1662         char *keystr = NULL;
1663         TALLOC_CTX *ctx = talloc_stackframe();
1664         int len;
1665         NTSTATUS status;
1666         bool result = false;
1667
1668         DEBUG(10,("regdb_store_values: Looking for value of key [%s] \n", key));
1669
1670         if (!regdb_key_exists(db, key)) {
1671                 goto done;
1672         }
1673
1674         ZERO_STRUCT(data);
1675
1676         len = regdb_pack_values(values, data.dptr, data.dsize);
1677         if (len <= 0) {
1678                 DEBUG(0,("regdb_store_values: unable to pack values. len <= 0\n"));
1679                 goto done;
1680         }
1681
1682         data.dptr = TALLOC_ARRAY(ctx, uint8, len);
1683         data.dsize = len;
1684
1685         len = regdb_pack_values(values, data.dptr, data.dsize);
1686
1687         SMB_ASSERT( len == data.dsize );
1688
1689         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key );
1690         if (!keystr) {
1691                 goto done;
1692         }
1693         keystr = normalize_reg_path(ctx, keystr);
1694         if (!keystr) {
1695                 goto done;
1696         }
1697
1698         old_data = dbwrap_fetch_bystring(db, ctx, keystr);
1699
1700         if ((old_data.dptr != NULL)
1701             && (old_data.dsize == data.dsize)
1702             && (memcmp(old_data.dptr, data.dptr, data.dsize) == 0))
1703         {
1704                 result = true;
1705                 goto done;
1706         }
1707
1708         status = dbwrap_trans_store_bystring(db, keystr, data, TDB_REPLACE);
1709
1710         result = NT_STATUS_IS_OK(status);
1711
1712 done:
1713         TALLOC_FREE(ctx);
1714         return result;
1715 }
1716
1717 bool regdb_store_values(const char *key, struct regval_ctr *values)
1718 {
1719         return regdb_store_values_internal(regdb, key, values);
1720 }
1721
1722 static WERROR regdb_get_secdesc(TALLOC_CTX *mem_ctx, const char *key,
1723                                 struct security_descriptor **psecdesc)
1724 {
1725         char *tdbkey;
1726         TDB_DATA data;
1727         NTSTATUS status;
1728         TALLOC_CTX *tmp_ctx = talloc_stackframe();
1729         WERROR err = WERR_OK;
1730
1731         DEBUG(10, ("regdb_get_secdesc: Getting secdesc of key [%s]\n", key));
1732
1733         if (!regdb_key_exists(regdb, key)) {
1734                 err = WERR_BADFILE;
1735                 goto done;
1736         }
1737
1738         tdbkey = talloc_asprintf(tmp_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1739         if (tdbkey == NULL) {
1740                 err = WERR_NOMEM;
1741                 goto done;
1742         }
1743
1744         tdbkey = normalize_reg_path(tmp_ctx, tdbkey);
1745         if (tdbkey == NULL) {
1746                 err = WERR_NOMEM;
1747                 goto done;
1748         }
1749
1750         data = dbwrap_fetch_bystring(regdb, tmp_ctx, tdbkey);
1751         if (data.dptr == NULL) {
1752                 err = WERR_BADFILE;
1753                 goto done;
1754         }
1755
1756         status = unmarshall_sec_desc(mem_ctx, (uint8 *)data.dptr, data.dsize,
1757                                      psecdesc);
1758
1759         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1760                 err = WERR_NOMEM;
1761         } else if (!NT_STATUS_IS_OK(status)) {
1762                 err = WERR_REG_CORRUPT;
1763         }
1764
1765 done:
1766         TALLOC_FREE(tmp_ctx);
1767         return err;
1768 }
1769
1770 static WERROR regdb_set_secdesc(const char *key,
1771                                 struct security_descriptor *secdesc)
1772 {
1773         TALLOC_CTX *mem_ctx = talloc_stackframe();
1774         char *tdbkey;
1775         WERROR err = WERR_NOMEM;
1776         TDB_DATA tdbdata;
1777
1778         if (!regdb_key_exists(regdb, key)) {
1779                 err = WERR_BADFILE;
1780                 goto done;
1781         }
1782
1783         tdbkey = talloc_asprintf(mem_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1784         if (tdbkey == NULL) {
1785                 goto done;
1786         }
1787         normalize_dbkey(tdbkey);
1788
1789         if (secdesc == NULL) {
1790                 /* assuming a delete */
1791                 err = ntstatus_to_werror(dbwrap_trans_delete_bystring(regdb,
1792                                                                       tdbkey));
1793                 goto done;
1794         }
1795
1796         err = ntstatus_to_werror(marshall_sec_desc(mem_ctx, secdesc,
1797                                                    &tdbdata.dptr,
1798                                                    &tdbdata.dsize));
1799         W_ERROR_NOT_OK_GOTO_DONE(err);
1800
1801         err = ntstatus_to_werror(dbwrap_trans_store_bystring(regdb, tdbkey,
1802                                                              tdbdata, 0));
1803
1804  done:
1805         TALLOC_FREE(mem_ctx);
1806         return err;
1807 }
1808
1809 bool regdb_subkeys_need_update(struct regsubkey_ctr *subkeys)
1810 {
1811         return (regdb_get_seqnum() != regsubkey_ctr_get_seqnum(subkeys));
1812 }
1813
1814 bool regdb_values_need_update(struct regval_ctr *values)
1815 {
1816         return (regdb_get_seqnum() != regval_ctr_get_seqnum(values));
1817 }
1818
1819 /*
1820  * Table of function pointers for default access
1821  */
1822
1823 struct registry_ops regdb_ops = {
1824         .fetch_subkeys = regdb_fetch_keys,
1825         .fetch_values = regdb_fetch_values,
1826         .store_subkeys = regdb_store_keys,
1827         .store_values = regdb_store_values,
1828         .create_subkey = regdb_create_subkey,
1829         .delete_subkey = regdb_delete_subkey,
1830         .get_secdesc = regdb_get_secdesc,
1831         .set_secdesc = regdb_set_secdesc,
1832         .subkeys_need_update = regdb_subkeys_need_update,
1833         .values_need_update = regdb_values_need_update
1834 };