source3/libnet/libnet_conf.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  libnet smbconf registry Support
   4  *  Copyright (C) Michael Adam 2007-2008
   5  *  Copyright (C) Guenther Deschner 2007
   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 #include "includes.h"
  22 #include "libnet/libnet.h"
  23
  24 /**********************************************************************
  25  *
  26  * Helper functions (mostly registry related)
  27  * TODO: These should be eventually static.
  28
  29  **********************************************************************/
  30
  31 /**
  32  * add a string to a talloced array of strings.
  33  */
  34 static WERROR libnet_smbconf_add_string_to_array(TALLOC_CTX *mem_ctx,
  35                                                 char ***array,
  36                                                 uint32_t count,
  37                                                 const char *string)
  38 {
  39         char **new_array = NULL;
  40
  41         if ((array == NULL) || (string == NULL)) {
  42                 return WERR_INVALID_PARAM;
  43         }
  44
  45         new_array = TALLOC_REALLOC_ARRAY(mem_ctx, *array, char *, count + 1);
  46         if (new_array == NULL) {
  47                 return WERR_NOMEM;
  48         }
  49
  50         new_array[count] = talloc_strdup(new_array, string);
  51
  52         *array = new_array;
  53
  54         return WERR_OK;
  55 }
  56
  57 /**
  58  * Open a subkey of KEY_SMBCONF (i.e a service)
  59  */
  60 static WERROR libnet_smbconf_reg_open_path(TALLOC_CTX *mem_ctx,
  61                                            const char *path,
  62                                            uint32 desired_access,
  63                                            struct registry_key **key)
  64 {
  65         WERROR werr = WERR_OK;
  66         NT_USER_TOKEN *token;
  67
  68         if (path == NULL) {
  69                 DEBUG(1, ("Error: NULL path string given\n"));
  70                 werr = WERR_INVALID_PARAM;
  71                 goto done;
  72         }
  73
  74         token = registry_create_admin_token(mem_ctx);
  75         if (token == NULL) {
  76                 DEBUG(1, ("Error creating admin token\n"));
  77                 /* what is the appropriate error code here? */
  78                 werr = WERR_CAN_NOT_COMPLETE;
  79                 goto done;
  80         }
  81
  82         werr = reg_open_path(mem_ctx, path, desired_access, token, key);
  83
  84         if (!W_ERROR_IS_OK(werr)) {
  85                 DEBUG(1, ("Error opening registry path '%s': %s\n",
  86                           path, dos_errstr(werr)));
  87         }
  88
  89 done:
  90         return werr;
  91 }
  92
  93 /**
  94  * Open a subkey of KEY_SMBCONF (i.e a service)
  95  */
  96 static WERROR libnet_smbconf_reg_open_service_key(TALLOC_CTX *ctx,
  97                                                   const char *servicename,
  98                                                   uint32 desired_access,
  99                                                   struct registry_key **key)
 100 {
 101         WERROR werr = WERR_OK;
 102         char *path = NULL;
 103         NT_USER_TOKEN *token;
 104
 105         if (servicename == NULL) {
 106                 DEBUG(3, ("Error: NULL servicename given.\n"));
 107                 werr = WERR_INVALID_PARAM;
 108                 goto done;
 109         }
 110
 111         path = talloc_asprintf(ctx, "%s\\%s", KEY_SMBCONF, servicename);
 112
 113         werr = libnet_smbconf_reg_open_path(ctx, path, desired_access, key);
 114
 115 done:
 116         TALLOC_FREE(path);
 117         return werr;
 118 }
 119
 120 /*
 121  * open the base key KEY_SMBCONF
 122  */
 123 static WERROR libnet_smbconf_reg_open_basekey(TALLOC_CTX *ctx,
 124                                               uint32 desired_access,
 125                                               struct registry_key **key)
 126 {
 127         return libnet_smbconf_reg_open_path(ctx, KEY_SMBCONF, desired_access,
 128                                             key);
 129 }
 130
 131 static bool libnet_smbconf_value_exists(struct registry_key *key,
 132                                         const char *param)
 133 {
 134         bool ret = false;
 135         WERROR werr = WERR_OK;
 136         TALLOC_CTX *ctx = talloc_stackframe();
 137         struct registry_value *value = NULL;
 138
 139         werr = reg_queryvalue(ctx, key, param, &value);
 140         if (W_ERROR_IS_OK(werr)) {
 141                 ret = true;
 142         }
 143
 144         TALLOC_FREE(ctx);
 145         return ret;
 146 }
 147
 148 /*
 149  * create a subkey of KEY_SMBCONF
 150  */
 151 static WERROR libnet_smbconf_reg_createkey_internal(TALLOC_CTX *ctx,
 152                                                     const char * subkeyname,
 153                                                     struct registry_key **newkey)
 154 {
 155         WERROR werr = WERR_OK;
 156         struct registry_key *create_parent = NULL;
 157         TALLOC_CTX *create_ctx;
 158         enum winreg_CreateAction action = REG_ACTION_NONE;
 159
 160         /* create a new talloc ctx for creation. it will hold
 161          * the intermediate parent key (SMBCONF) for creation
 162          * and will be destroyed when leaving this function... */
 163         if (!(create_ctx = talloc_new(ctx))) {
 164                 werr = WERR_NOMEM;
 165                 goto done;
 166         }
 167
 168         werr = libnet_smbconf_reg_open_basekey(create_ctx, REG_KEY_WRITE,
 169                                                &create_parent);
 170         if (!W_ERROR_IS_OK(werr)) {
 171                 goto done;
 172         }
 173
 174         werr = reg_createkey(ctx, create_parent, subkeyname,
 175                              REG_KEY_WRITE, newkey, &action);
 176         if (W_ERROR_IS_OK(werr) && (action != REG_CREATED_NEW_KEY)) {
 177                 DEBUG(10, ("Key '%s' already exists.\n", subkeyname));
 178                 werr = WERR_ALREADY_EXISTS;
 179         }
 180         if (!W_ERROR_IS_OK(werr)) {
 181                 DEBUG(5, ("Error creating key %s: %s\n",
 182                          subkeyname, dos_errstr(werr)));
 183         }
 184
 185 done:
 186         TALLOC_FREE(create_ctx);
 187         return werr;
 188 }
 189
 190 /*
 191  * add a value to a key.
 192  */
 193 static WERROR libnet_smbconf_reg_setvalue_internal(struct registry_key *key,
 194                                                    const char *valname,
 195                                                    const char *valstr)
 196 {
 197         struct registry_value val;
 198         WERROR werr = WERR_OK;
 199         char *subkeyname;
 200         const char *canon_valname;
 201         const char *canon_valstr;
 202
 203         if (!lp_canonicalize_parameter_with_value(valname, valstr,
 204                                                   &canon_valname,
 205                                                   &canon_valstr))
 206         {
 207                 if (canon_valname == NULL) {
 208                         DEBUG(5, ("invalid parameter '%s' given\n",
 209                                   valname));
 210                 } else {
 211                         DEBUG(5, ("invalid value '%s' given for "
 212                                   "parameter '%s'\n", valstr, valname));
 213                 }
 214                 werr = WERR_INVALID_PARAM;
 215                 goto done;
 216         }
 217
 218         ZERO_STRUCT(val);
 219
 220         val.type = REG_SZ;
 221         val.v.sz.str = CONST_DISCARD(char *, canon_valstr);
 222         val.v.sz.len = strlen(canon_valstr) + 1;
 223
 224         if (registry_smbconf_valname_forbidden(canon_valname)) {
 225                 DEBUG(5, ("Parameter '%s' not allowed in registry.\n",
 226                           canon_valname));
 227                 werr = WERR_INVALID_PARAM;
 228                 goto done;
 229         }
 230
 231         subkeyname = strrchr_m(key->key->name, '\\');
 232         if ((subkeyname == NULL) || (*(subkeyname +1) == '\0')) {
 233                 DEBUG(5, ("Invalid registry key '%s' given as "
 234                           "smbconf section.\n", key->key->name));
 235                 werr = WERR_INVALID_PARAM;
 236                 goto done;
 237         }
 238         subkeyname++;
 239         if (!strequal(subkeyname, GLOBAL_NAME) &&
 240             lp_parameter_is_global(valname))
 241         {
 242                 DEBUG(5, ("Global paramter '%s' not allowed in "
 243                           "service definition ('%s').\n", canon_valname,
 244                           subkeyname));
 245                 werr = WERR_INVALID_PARAM;
 246                 goto done;
 247         }
 248
 249         werr = reg_setvalue(key, canon_valname, &val);
 250         if (!W_ERROR_IS_OK(werr)) {
 251                 DEBUG(5, ("Error adding value '%s' to "
 252                           "key '%s': %s\n",
 253                           canon_valname, key->key->name, dos_errstr(werr)));
 254         }
 255
 256 done:
 257         return werr;
 258 }
 259
 260 /**
 261  * format a registry_value into a string.
 262  *
 263  * This is intended to be used for smbconf registry values,
 264  * which are ar stored as REG_SZ values, so the incomplete
 265  * handling should be ok.
 266  */
 267 static char *libnet_smbconf_format_registry_value(TALLOC_CTX *mem_ctx,
 268                                                   struct registry_value *value)
 269 {
 270         char *result = NULL;
 271
 272         /* alternatively, create a new talloc context? */
 273         if (mem_ctx == NULL) {
 274                 return result;
 275         }
 276
 277         switch (value->type) {
 278         case REG_DWORD:
 279                 result = talloc_asprintf(mem_ctx, "%d", value->v.dword);
 280                 break;
 281         case REG_SZ:
 282         case REG_EXPAND_SZ:
 283                 result = talloc_asprintf(mem_ctx, "%s", value->v.sz.str);
 284                 break;
 285         case REG_MULTI_SZ: {
 286                 uint32 j;
 287                 for (j = 0; j < value->v.multi_sz.num_strings; j++) {
 288                         result = talloc_asprintf(mem_ctx, "\"%s\" ",
 289                                                  value->v.multi_sz.strings[j]);
 290                 }
 291                 break;
 292         }
 293         case REG_BINARY:
 294                 result = talloc_asprintf(mem_ctx, "binary (%d bytes)",
 295                                          (int)value->v.binary.length);
 296                 break;
 297         default:
 298                 result = talloc_asprintf(mem_ctx, "<unprintable>");
 299                 break;
 300         }
 301         return result;
 302 }
 303
 304 /**
 305  * Get the values of a key as a list of value names
 306  * and a list of value strings (ordered)
 307  */
 308 static WERROR libnet_smbconf_reg_get_values(TALLOC_CTX *mem_ctx,
 309                                             struct registry_key *key,
 310                                             uint32_t *num_values,
 311                                             char ***value_names,
 312                                             char ***value_strings)
 313 {
 314         TALLOC_CTX *tmp_ctx = NULL;
 315         WERROR werr = WERR_OK;
 316         uint32_t count;
 317         struct registry_value *valvalue = NULL;
 318         char *valname = NULL;
 319         char **tmp_valnames = NULL;
 320         char **tmp_valstrings = NULL;
 321
 322         if ((num_values == NULL) || (value_names == NULL) ||
 323             (value_strings == NULL))
 324         {
 325                 werr = WERR_INVALID_PARAM;
 326                 goto done;
 327         }
 328
 329         tmp_ctx = talloc_new(mem_ctx);
 330         if (tmp_ctx == NULL) {
 331                 werr = WERR_NOMEM;
 332                 goto done;
 333         }
 334
 335         for (count = 0;
 336              W_ERROR_IS_OK(werr = reg_enumvalue(tmp_ctx, key, count, &valname,
 337                                                 &valvalue));
 338              count++)
 339         {
 340                 char *valstring;
 341
 342                 werr = libnet_smbconf_add_string_to_array(tmp_ctx,
 343                                                           &tmp_valnames,
 344                                                           count, valname);
 345                 if (!W_ERROR_IS_OK(werr)) {
 346                         goto done;
 347                 }
 348
 349                 valstring = libnet_smbconf_format_registry_value(tmp_ctx,
 350                                                                  valvalue);
 351                 werr = libnet_smbconf_add_string_to_array(tmp_ctx,
 352                                                           &tmp_valstrings,
 353                                                           count,
 354                                                           valstring);
 355                 if (!W_ERROR_IS_OK(werr)) {
 356                         goto done;
 357                 }
 358         }
 359         if (!W_ERROR_EQUAL(WERR_NO_MORE_ITEMS, werr)) {
 360                 goto done;
 361         }
 362
 363         werr = WERR_OK;
 364
 365         *num_values = count;
 366         if (count > 0) {
 367                 *value_names = talloc_move(mem_ctx, &tmp_valnames);
 368                 *value_strings = talloc_move(mem_ctx, &tmp_valstrings);
 369         } else {
 370                 *value_names = NULL;
 371                 *value_strings = NULL;
 372         }
 373
 374 done:
 375         TALLOC_FREE(tmp_ctx);
 376         return werr;
 377 }
 378
 379 /**********************************************************************
 380  *
 381  * The actual net conf api functions, that are exported.
 382  *
 383  **********************************************************************/
 384
 385 /**
 386  * Drop the whole configuration (restarting empty).
 387  */
 388 WERROR libnet_smbconf_drop(void)
 389 {
 390         char *path, *p;
 391         WERROR werr = WERR_OK;
 392         NT_USER_TOKEN *token;
 393         struct registry_key *parent_key = NULL;
 394         struct registry_key *new_key = NULL;
 395         TALLOC_CTX* mem_ctx = talloc_stackframe();
 396         enum winreg_CreateAction action;
 397
 398         path = talloc_strdup(mem_ctx, KEY_SMBCONF);
 399         if (path == NULL) {
 400                 werr = WERR_NOMEM;
 401                 goto done;
 402         }
 403         p = strrchr(path, '\\');
 404         *p = '\0';
 405         werr = libnet_smbconf_reg_open_path(mem_ctx, path, REG_KEY_WRITE,
 406                                             &parent_key);
 407
 408         if (!W_ERROR_IS_OK(werr)) {
 409                 goto done;
 410         }
 411
 412         werr = reg_deletekey_recursive(mem_ctx, parent_key, p+1);
 413
 414         if (!W_ERROR_IS_OK(werr)) {
 415                 goto done;
 416         }
 417
 418         werr = reg_createkey(mem_ctx, parent_key, p+1, REG_KEY_WRITE,
 419                              &new_key, &action);
 420
 421 done:
 422         TALLOC_FREE(mem_ctx);
 423         return werr;
 424 }
 425
 426 /**
 427  * Get the whole configuration as lists of strings with counts:
 428  *
 429  *  num_shares   : number of shares
 430  *  share_names  : list of length num_shares of share names
 431  *  num_params   : list of length num_shares of parameter counts for each share
 432  *  param_names  : list of lists of parameter names for each share
 433  *  param_values : list of lists of parameter values for each share
 434  */
 435 WERROR libnet_smbconf_get_config(TALLOC_CTX *mem_ctx, uint32_t *num_shares,
 436                                  char ***share_names, uint32_t **num_params,
 437                                  char ****param_names, char ****param_values)
 438 {
 439         WERROR werr = WERR_OK;
 440         TALLOC_CTX *tmp_ctx = NULL;
 441         uint32_t tmp_num_shares;
 442         char **tmp_share_names;
 443         uint32_t *tmp_num_params;
 444         char ***tmp_param_names;
 445         char ***tmp_param_values;
 446         uint32_t count;
 447
 448         if ((num_shares == NULL) || (share_names == NULL) ||
 449             (num_params == NULL) || (param_names == NULL) ||
 450             (param_values == NULL))
 451         {
 452                 werr = WERR_INVALID_PARAM;
 453                 goto done;
 454         }
 455
 456         tmp_ctx = talloc_new(mem_ctx);
 457         if (tmp_ctx == NULL) {
 458                 werr = WERR_NOMEM;
 459                 goto done;
 460         }
 461
 462         werr = libnet_smbconf_get_share_names(tmp_ctx, &tmp_num_shares,
 463                                               &tmp_share_names);
 464         if (!W_ERROR_IS_OK(werr)) {
 465                 goto done;
 466         }
 467
 468         tmp_num_params   = TALLOC_ARRAY(tmp_ctx, uint32_t, tmp_num_shares);
 469         tmp_param_names  = TALLOC_ARRAY(tmp_ctx, char **, tmp_num_shares);
 470         tmp_param_values = TALLOC_ARRAY(tmp_ctx, char **, tmp_num_shares);
 471
 472         if ((tmp_num_params == NULL) || (tmp_param_names == NULL) ||
 473             (tmp_param_values == NULL))
 474         {
 475                 werr = WERR_NOMEM;
 476                 goto done;
 477         }
 478
 479         for (count = 0; count < tmp_num_shares; count++) {
 480                 werr = libnet_smbconf_getshare(mem_ctx, tmp_share_names[count],
 481                                                &tmp_num_params[count],
 482                                                &tmp_param_names[count],
 483                                                &tmp_param_values[count]);
 484                 if (!W_ERROR_IS_OK(werr)) {
 485                         goto done;
 486                 }
 487         }
 488
 489         werr = WERR_OK;
 490
 491         *num_shares = tmp_num_shares;
 492         if (tmp_num_shares > 0) {
 493                 *share_names = talloc_move(mem_ctx, &tmp_share_names);
 494                 *num_params = talloc_move(mem_ctx, &tmp_num_params);
 495                 *param_names = talloc_move(mem_ctx, &tmp_param_names);
 496                 *param_values = talloc_move(mem_ctx, &tmp_param_values);
 497         } else {
 498                 *share_names = NULL;
 499                 *num_params = NULL;
 500                 *param_names = NULL;
 501                 *param_values = NULL;
 502         }
 503
 504 done:
 505         TALLOC_FREE(tmp_ctx);
 506         return werr;
 507 }
 508
 509
 510 /**
 511  * get the list of share names defined in the configuration.
 512  */
 513 WERROR libnet_smbconf_get_share_names(TALLOC_CTX *mem_ctx, uint32_t *num_shares,
 514                                       char ***share_names)
 515 {
 516         uint32_t count;
 517         uint32_t added_count = 0;
 518         TALLOC_CTX *tmp_ctx = NULL;
 519         WERROR werr = WERR_OK;
 520         struct registry_key *key = NULL;
 521         char *subkey_name = NULL;
 522         char **tmp_share_names = NULL;
 523
 524         if ((num_shares == NULL) || (share_names == NULL)) {
 525                 werr = WERR_INVALID_PARAM;
 526                 goto done;
 527         }
 528
 529         tmp_ctx = talloc_new(mem_ctx);
 530         if (tmp_ctx == NULL) {
 531                 werr = WERR_NOMEM;
 532                 goto done;
 533         }
 534
 535         /* make sure "global" is always listed first */
 536         if (libnet_smbconf_share_exists(GLOBAL_NAME)) {
 537                 werr = libnet_smbconf_add_string_to_array(tmp_ctx,
 538                                                           &tmp_share_names,
 539                                                           0, GLOBAL_NAME);
 540                 if (!W_ERROR_IS_OK(werr)) {
 541                         goto done;
 542                 }
 543                 added_count++;
 544         }
 545
 546         werr = libnet_smbconf_reg_open_basekey(tmp_ctx,
 547                                                SEC_RIGHTS_ENUM_SUBKEYS,
 548                                                &key);
 549         if (!W_ERROR_IS_OK(werr)) {
 550                 goto done;
 551         }
 552
 553         for (count = 0;
 554              W_ERROR_IS_OK(werr = reg_enumkey(tmp_ctx, key, count,
 555                                               &subkey_name, NULL));
 556              count++)
 557         {
 558                 if (strequal(subkey_name, GLOBAL_NAME)) {
 559                         continue;
 560                 }
 561
 562                 werr = libnet_smbconf_add_string_to_array(tmp_ctx,
 563                                                           &tmp_share_names,
 564                                                           added_count,
 565                                                           subkey_name);
 566                 if (!W_ERROR_IS_OK(werr)) {
 567                         goto done;
 568                 }
 569                 added_count++;
 570         }
 571         if (!W_ERROR_EQUAL(WERR_NO_MORE_ITEMS, werr)) {
 572                 goto done;
 573         }
 574         werr = WERR_OK;
 575
 576         *num_shares = added_count;
 577         if (added_count > 0) {
 578                 *share_names = talloc_move(mem_ctx, &tmp_share_names);
 579         } else {
 580                 *share_names = NULL;
 581         }
 582
 583 done:
 584         TALLOC_FREE(tmp_ctx);
 585         return werr;
 586 }
 587
 588 /**
 589  * check if a share/service of a given name exists
 590  */
 591 bool libnet_smbconf_share_exists(const char *servicename)
 592 {
 593         bool ret = false;
 594         WERROR werr = WERR_OK;
 595         TALLOC_CTX *mem_ctx = talloc_stackframe();
 596         struct registry_key *key = NULL;
 597
 598         werr = libnet_smbconf_reg_open_service_key(mem_ctx, servicename,
 599                                                    REG_KEY_READ, &key);
 600         if (W_ERROR_IS_OK(werr)) {
 601                 ret = true;
 602         }
 603
 604         TALLOC_FREE(mem_ctx);
 605         return ret;
 606 }
 607
 608 /**
 609  * get a definition of a share (service) from configuration.
 610  */
 611 WERROR libnet_smbconf_getshare(TALLOC_CTX *mem_ctx, const char *servicename,
 612                                uint32_t *num_params, char ***param_names,
 613                                char ***param_values)
 614 {
 615         WERROR werr = WERR_OK;
 616         struct registry_key *key = NULL;
 617
 618         werr = libnet_smbconf_reg_open_service_key(mem_ctx, servicename,
 619                                                    REG_KEY_READ, &key);
 620         if (!W_ERROR_IS_OK(werr)) {
 621                 goto done;
 622         }
 623
 624         werr = libnet_smbconf_reg_get_values(mem_ctx, key, num_params,
 625                                              param_names, param_values);
 626
 627 done:
 628         TALLOC_FREE(key);
 629         return werr;
 630 }
 631
 632 /**
 633  * delete a service from configuration
 634  */
 635 WERROR libnet_smbconf_delshare(const char *servicename)
 636 {
 637         WERROR werr = WERR_OK;
 638         struct registry_key *key = NULL;
 639         TALLOC_CTX *ctx = talloc_stackframe();
 640
 641         werr = libnet_smbconf_reg_open_basekey(ctx, REG_KEY_WRITE, &key);
 642         if (!W_ERROR_IS_OK(werr)) {
 643                 goto done;
 644         }
 645
 646         werr = reg_deletekey_recursive(key, key, servicename);
 647
 648 done:
 649         TALLOC_FREE(ctx);
 650         return werr;
 651 }
 652
 653 /**
 654  * set a configuration parameter to the value provided.
 655  */
 656 WERROR libnet_smbconf_setparm(const char *service,
 657                               const char *param,
 658                               const char *valstr)
 659 {
 660         WERROR werr;
 661         struct registry_key *key = NULL;
 662         TALLOC_CTX *mem_ctx = talloc_stackframe();
 663
 664         if (!libnet_smbconf_share_exists(service)) {
 665                 werr = libnet_smbconf_reg_createkey_internal(mem_ctx, service,
 666                                                              &key);
 667         } else {
 668                 werr = libnet_smbconf_reg_open_service_key(mem_ctx, service,
 669                                                            REG_KEY_WRITE, &key);
 670         }
 671         if (!W_ERROR_IS_OK(werr)) {
 672                 goto done;
 673         }
 674
 675         werr = libnet_smbconf_reg_setvalue_internal(key, param, valstr);
 676
 677 done:
 678         TALLOC_FREE(mem_ctx);
 679         return werr;
 680 }
 681
 682 /**
 683  * get the value of a configuration parameter as a string
 684  */
 685 WERROR libnet_smbconf_getparm(TALLOC_CTX *mem_ctx,
 686                               const char *service,
 687                               const char *param,
 688                               char **valstr)
 689 {
 690         WERROR werr = WERR_OK;
 691         struct registry_key *key = NULL;
 692         struct registry_value *value = NULL;
 693
 694         if (valstr == NULL) {
 695                 werr = WERR_INVALID_PARAM;
 696                 goto done;
 697         }
 698
 699         if (!libnet_smbconf_share_exists(service)) {
 700                 werr = WERR_NO_SUCH_SERVICE;
 701                 goto done;
 702         }
 703
 704         werr = libnet_smbconf_reg_open_service_key(mem_ctx, service,
 705                                                    REG_KEY_READ, &key);
 706         if (!W_ERROR_IS_OK(werr)) {
 707                 goto done;
 708         }
 709
 710         if (!libnet_smbconf_value_exists(key, param)) {
 711                 werr = WERR_INVALID_PARAM;
 712                 goto done;
 713         }
 714
 715         werr = reg_queryvalue(mem_ctx, key, param, &value);
 716         if (!W_ERROR_IS_OK(werr)) {
 717                 goto done;
 718         }
 719
 720         *valstr = libnet_smbconf_format_registry_value(mem_ctx, value);
 721
 722         if (*valstr == NULL) {
 723                 werr = WERR_NOMEM;
 724         }
 725
 726 done:
 727         TALLOC_FREE(key);
 728         TALLOC_FREE(value);
 729         return werr;
 730 }
 731
 732 /**
 733  * delete a parameter from configuration
 734  */
 735 WERROR libnet_smbconf_delparm(const char *service,
 736                               const char *param)
 737 {
 738         struct registry_key *key = NULL;
 739         WERROR werr = WERR_OK;
 740         TALLOC_CTX *mem_ctx = talloc_stackframe();
 741
 742         if (!libnet_smbconf_share_exists(service)) {
 743                 return WERR_NO_SUCH_SERVICE;
 744         }
 745
 746         werr = libnet_smbconf_reg_open_service_key(mem_ctx, service,
 747                                                    REG_KEY_ALL, &key);
 748         if (!W_ERROR_IS_OK(werr)) {
 749                 goto done;
 750         }
 751
 752         if (!libnet_smbconf_value_exists(key, param)) {
 753                 werr = WERR_INVALID_PARAM;
 754                 goto done;
 755         }
 756
 757         werr = reg_deletevalue(key, param);
 758
 759 done:
 760         TALLOC_FREE(mem_ctx);
 761         return werr;
 762 }
 763
 764
 765 /**********************************************************************
 766  *
 767  * Convenience functions that are also exported.
 768  *
 769  **********************************************************************/
 770
 771 WERROR libnet_smbconf_set_global_param(const char *param,
 772                                        const char *val)
 773 {
 774         return libnet_smbconf_setparm(GLOBAL_NAME, param, val);
 775 }
 776