source/lib/smbconf/smbconf_txt.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  libsmbconf - Samba configuration library, text backend
   4  *  Copyright (C) Michael Adam 2008
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 /*
  21  * This is a sample implementation of a libsmbconf text backend
  22  * using the params.c parser.
  23  *
  24  * It is read only.
  25  * Don't expect brilliant performance, since it is not hashing the lists.
  26  */
  27
  28 #include "includes.h"
  29 #include "smbconf_private.h"
  30
  31 struct txt_cache {
  32         uint32_t current_share;
  33         uint32_t num_shares;
  34         char **share_names;
  35         uint32_t *num_params;
  36         char ***param_names;
  37         char ***param_values;
  38 };
  39
  40 struct txt_private_data {
  41         struct txt_cache *cache;
  42         uint64_t csn;
  43         bool verbatim;
  44 };
  45
  46 /**********************************************************************
  47  *
  48  * helper functions
  49  *
  50  **********************************************************************/
  51
  52 /**
  53  * a convenience helper to cast the private data structure
  54  */
  55 static struct txt_private_data *pd(struct smbconf_ctx *ctx)
  56 {
  57         return (struct txt_private_data *)(ctx->data);
  58 }
  59
  60 static bool smbconf_txt_do_section(const char *section, void *private_data)
  61 {
  62         WERROR werr;
  63         uint32_t idx;
  64         struct txt_private_data *tpd = (struct txt_private_data *)private_data;
  65         struct txt_cache *cache = tpd->cache;
  66
  67         if (smbconf_find_in_array(section, cache->share_names,
  68                                   cache->num_shares, &idx))
  69         {
  70                 cache->current_share = idx;
  71                 return true;
  72         }
  73
  74         werr = smbconf_add_string_to_array(cache, &(cache->share_names),
  75                                            cache->num_shares, section);
  76         if (!W_ERROR_IS_OK(werr)) {
  77                 return false;
  78         }
  79         cache->current_share = cache->num_shares;
  80         cache->num_shares++;
  81
  82         cache->param_names = TALLOC_REALLOC_ARRAY(cache,
  83                                                   cache->param_names,
  84                                                   char **,
  85                                                   cache->num_shares);
  86         if (cache->param_names == NULL) {
  87                 return false;
  88         }
  89         cache->param_names[cache->current_share] = NULL;
  90
  91         cache->param_values = TALLOC_REALLOC_ARRAY(cache,
  92                                                    cache->param_values,
  93                                                    char **,
  94                                                    cache->num_shares);
  95         if (cache->param_values == NULL) {
  96                 return false;
  97         }
  98         cache->param_values[cache->current_share] = NULL;
  99
 100         cache->num_params = TALLOC_REALLOC_ARRAY(cache,
 101                                                  cache->num_params,
 102                                                  uint32_t,
 103                                                  cache->num_shares);
 104         if (cache->num_params == NULL) {
 105                 return false;
 106         }
 107         cache->num_params[cache->current_share] = 0;
 108
 109         return true;
 110 }
 111
 112 static bool smbconf_txt_do_parameter(const char *param_name,
 113                                      const char *param_value,
 114                                      void *private_data)
 115 {
 116         WERROR werr;
 117         char **param_names, **param_values;
 118         uint32_t num_params;
 119         uint32_t idx;
 120         struct txt_private_data *tpd = (struct txt_private_data *)private_data;
 121         struct txt_cache *cache = tpd->cache;
 122
 123         if (cache->num_shares == 0) {
 124                 /*
 125                  * not in any share yet,
 126                  * initialize the "empty" section (NULL):
 127                  * parameters without a previous [section] are stored here.
 128                  */
 129                 if (!smbconf_txt_do_section(NULL, private_data)) {
 130                         return false;
 131                 }
 132         }
 133
 134         param_names  = cache->param_names[cache->current_share];
 135         param_values = cache->param_values[cache->current_share];
 136         num_params   = cache->num_params[cache->current_share];
 137
 138         if (!(tpd->verbatim) &&
 139             smbconf_find_in_array(param_name, param_names, num_params, &idx))
 140         {
 141                 TALLOC_FREE(param_values[idx]);
 142                 param_values[idx] = talloc_strdup(cache, param_value);
 143                 if (param_values[idx] == NULL) {
 144                         return false;
 145                 }
 146                 return true;
 147         }
 148         werr = smbconf_add_string_to_array(cache,
 149                                 &(cache->param_names[cache->current_share]),
 150                                 num_params, param_name);
 151         if (!W_ERROR_IS_OK(werr)) {
 152                 return false;
 153         }
 154         werr = smbconf_add_string_to_array(cache,
 155                                 &(cache->param_values[cache->current_share]),
 156                                 num_params, param_value);
 157         cache->num_params[cache->current_share]++;
 158         return W_ERROR_IS_OK(werr);
 159 }
 160
 161 static void smbconf_txt_flush_cache(struct smbconf_ctx *ctx)
 162 {
 163         TALLOC_FREE(pd(ctx)->cache);
 164 }
 165
 166 static WERROR smbconf_txt_init_cache(struct smbconf_ctx *ctx)
 167 {
 168         if (pd(ctx)->cache != NULL) {
 169                 smbconf_txt_flush_cache(ctx);
 170         }
 171
 172         pd(ctx)->cache = TALLOC_ZERO_P(pd(ctx), struct txt_cache);
 173
 174         if (pd(ctx)->cache == NULL) {
 175                 return WERR_NOMEM;
 176         }
 177
 178         return WERR_OK;
 179 }
 180
 181 static WERROR smbconf_txt_load_file(struct smbconf_ctx *ctx)
 182 {
 183         WERROR werr;
 184         uint64_t new_csn;
 185
 186         if (!file_exist(ctx->path, NULL)) {
 187                 return WERR_BADFILE;
 188         }
 189
 190         new_csn = (uint64_t)file_modtime(ctx->path);
 191         if (new_csn == pd(ctx)->csn) {
 192                 return WERR_OK;
 193         }
 194
 195         werr = smbconf_txt_init_cache(ctx);
 196         if (!W_ERROR_IS_OK(werr)) {
 197                 return werr;
 198         }
 199
 200         if (!pm_process(ctx->path, smbconf_txt_do_section,
 201                         smbconf_txt_do_parameter, pd(ctx)))
 202         {
 203                 return WERR_CAN_NOT_COMPLETE;
 204         }
 205
 206         pd(ctx)->csn = new_csn;
 207
 208         return WERR_OK;
 209 }
 210
 211
 212 /**********************************************************************
 213  *
 214  * smbconf operations: text backend implementations
 215  *
 216  **********************************************************************/
 217
 218 /**
 219  * initialize the text based smbconf backend
 220  */
 221 static WERROR smbconf_txt_init(struct smbconf_ctx *ctx, const char *path)
 222 {
 223         if (path == NULL) {
 224                 path = get_dyn_CONFIGFILE();
 225         }
 226         ctx->path = talloc_strdup(ctx, path);
 227         if (ctx->path == NULL) {
 228                 return WERR_NOMEM;
 229         }
 230
 231         ctx->data = TALLOC_ZERO_P(ctx, struct txt_private_data);
 232         if (ctx->data == NULL) {
 233                 return WERR_NOMEM;
 234         }
 235
 236         pd(ctx)->verbatim = true;
 237
 238         return WERR_OK;
 239 }
 240
 241 static int smbconf_txt_shutdown(struct smbconf_ctx *ctx)
 242 {
 243         return ctx->ops->close_conf(ctx);
 244 }
 245
 246 static bool smbconf_txt_requires_messaging(struct smbconf_ctx *ctx)
 247 {
 248         return false;
 249 }
 250
 251 static WERROR smbconf_txt_open(struct smbconf_ctx *ctx)
 252 {
 253         return smbconf_txt_load_file(ctx);
 254 }
 255
 256 static int smbconf_txt_close(struct smbconf_ctx *ctx)
 257 {
 258         smbconf_txt_flush_cache(ctx);
 259         return 0;
 260 }
 261
 262 /**
 263  * Get the change sequence number of the given service/parameter.
 264  * service and parameter strings may be NULL.
 265  */
 266 static void smbconf_txt_get_csn(struct smbconf_ctx *ctx,
 267                                 struct smbconf_csn *csn,
 268                                 const char *service, const char *param)
 269 {
 270         if (csn == NULL) {
 271                 return;
 272         }
 273
 274         csn->csn = (uint64_t)file_modtime(ctx->path);
 275 }
 276
 277 /**
 278  * Drop the whole configuration (restarting empty)
 279  */
 280 static WERROR smbconf_txt_drop(struct smbconf_ctx *ctx)
 281 {
 282         return WERR_NOT_SUPPORTED;
 283 }
 284
 285 /**
 286  * get the list of share names defined in the configuration.
 287  */
 288 static WERROR smbconf_txt_get_share_names(struct smbconf_ctx *ctx,
 289                                           TALLOC_CTX *mem_ctx,
 290                                           uint32_t *num_shares,
 291                                           char ***share_names)
 292 {
 293         uint32_t count;
 294         uint32_t added_count = 0;
 295         TALLOC_CTX *tmp_ctx = NULL;
 296         WERROR werr = WERR_OK;
 297         char **tmp_share_names = NULL;
 298
 299         if ((num_shares == NULL) || (share_names == NULL)) {
 300                 werr = WERR_INVALID_PARAM;
 301                 goto done;
 302         }
 303
 304         werr = smbconf_txt_load_file(ctx);
 305         if (!W_ERROR_IS_OK(werr)) {
 306                 return werr;
 307         }
 308
 309         tmp_ctx = talloc_stackframe();
 310
 311         /* make sure "global" is always listed first,
 312          * possibly after NULL section */
 313
 314         if (smbconf_share_exists(ctx, NULL)) {
 315                 werr = smbconf_add_string_to_array(tmp_ctx, &tmp_share_names,
 316                                                    0, NULL);
 317                 if (!W_ERROR_IS_OK(werr)) {
 318                         goto done;
 319                 }
 320                 added_count++;
 321         }
 322
 323         if (smbconf_share_exists(ctx, GLOBAL_NAME)) {
 324                 werr = smbconf_add_string_to_array(tmp_ctx, &tmp_share_names,
 325                                                    added_count, GLOBAL_NAME);
 326                 if (!W_ERROR_IS_OK(werr)) {
 327                         goto done;
 328                 }
 329                 added_count++;
 330         }
 331
 332         for (count = 0; count < pd(ctx)->cache->num_shares; count++) {
 333                 if (strequal(pd(ctx)->cache->share_names[count], GLOBAL_NAME) ||
 334                     (pd(ctx)->cache->share_names[count] == NULL))
 335                 {
 336                         continue;
 337                 }
 338
 339                 werr = smbconf_add_string_to_array(tmp_ctx, &tmp_share_names,
 340                                         added_count,
 341                                         pd(ctx)->cache->share_names[count]);
 342                 if (!W_ERROR_IS_OK(werr)) {
 343                         goto done;
 344                 }
 345                 added_count++;
 346         }
 347
 348         *num_shares = added_count;
 349         if (added_count > 0) {
 350                 *share_names = talloc_move(mem_ctx, &tmp_share_names);
 351         } else {
 352                 *share_names = NULL;
 353         }
 354
 355 done:
 356         TALLOC_FREE(tmp_ctx);
 357         return werr;
 358 }
 359
 360 /**
 361  * check if a share/service of a given name exists
 362  */
 363 static bool smbconf_txt_share_exists(struct smbconf_ctx *ctx,
 364                                      const char *servicename)
 365 {
 366         WERROR werr;
 367
 368         werr = smbconf_txt_load_file(ctx);
 369         if (!W_ERROR_IS_OK(werr)) {
 370                 return false;
 371         }
 372
 373         return smbconf_find_in_array(servicename,
 374                                      pd(ctx)->cache->share_names,
 375                                      pd(ctx)->cache->num_shares, NULL);
 376 }
 377
 378 /**
 379  * Add a service if it does not already exist
 380  */
 381 static WERROR smbconf_txt_create_share(struct smbconf_ctx *ctx,
 382                                        const char *servicename)
 383 {
 384         return WERR_NOT_SUPPORTED;
 385 }
 386
 387 /**
 388  * get a definition of a share (service) from configuration.
 389  */
 390 static WERROR smbconf_txt_get_share(struct smbconf_ctx *ctx,
 391                                     TALLOC_CTX *mem_ctx,
 392                                     const char *servicename,
 393                                     struct smbconf_service **service)
 394 {
 395         WERROR werr;
 396         uint32_t sidx, count;
 397         bool found;
 398         TALLOC_CTX *tmp_ctx = NULL;
 399         struct smbconf_service *tmp_service = NULL;
 400
 401         werr = smbconf_txt_load_file(ctx);
 402         if (!W_ERROR_IS_OK(werr)) {
 403                 return werr;
 404         }
 405
 406         found = smbconf_find_in_array(servicename,
 407                                       pd(ctx)->cache->share_names,
 408                                       pd(ctx)->cache->num_shares,
 409                                       &sidx);
 410         if (!found) {
 411                 return WERR_NO_SUCH_SERVICE;
 412         }
 413
 414         tmp_ctx = talloc_stackframe();
 415
 416         tmp_service = TALLOC_ZERO_P(tmp_ctx, struct smbconf_service);
 417         if (tmp_service == NULL) {
 418                 werr = WERR_NOMEM;
 419                 goto done;
 420         }
 421
 422         if (servicename != NULL) {
 423                 tmp_service->name = talloc_strdup(tmp_service, servicename);
 424                 if (tmp_service->name == NULL) {
 425                         werr = WERR_NOMEM;
 426                         goto done;
 427                 }
 428         }
 429
 430         for (count = 0; count < pd(ctx)->cache->num_params[sidx]; count++) {
 431                 werr = smbconf_add_string_to_array(tmp_service,
 432                                 &(tmp_service->param_names),
 433                                 count,
 434                                 pd(ctx)->cache->param_names[sidx][count]);
 435                 if (!W_ERROR_IS_OK(werr)) {
 436                         goto done;
 437                 }
 438                 werr = smbconf_add_string_to_array(tmp_service,
 439                                 &(tmp_service->param_values),
 440                                 count,
 441                                 pd(ctx)->cache->param_values[sidx][count]);
 442                 if (!W_ERROR_IS_OK(werr)) {
 443                         goto done;
 444                 }
 445         }
 446
 447         tmp_service->num_params = count;
 448         if (count > 0) {
 449                 *service = talloc_move(mem_ctx, &tmp_service);
 450         } else {
 451                 *service = NULL;
 452         }
 453
 454 done:
 455         TALLOC_FREE(tmp_ctx);
 456         return werr;
 457 }
 458
 459 /**
 460  * delete a service from configuration
 461  */
 462 static WERROR smbconf_txt_delete_share(struct smbconf_ctx *ctx,
 463                                        const char *servicename)
 464 {
 465         return WERR_NOT_SUPPORTED;
 466 }
 467
 468 /**
 469  * set a configuration parameter to the value provided.
 470  */
 471 static WERROR smbconf_txt_set_parameter(struct smbconf_ctx *ctx,
 472                                         const char *service,
 473                                         const char *param,
 474                                         const char *valstr)
 475 {
 476         return WERR_NOT_SUPPORTED;
 477 }
 478
 479 /**
 480  * get the value of a configuration parameter as a string
 481  */
 482 static WERROR smbconf_txt_get_parameter(struct smbconf_ctx *ctx,
 483                                         TALLOC_CTX *mem_ctx,
 484                                         const char *service,
 485                                         const char *param,
 486                                         char **valstr)
 487 {
 488         WERROR werr;
 489         bool found;
 490         uint32_t share_index, param_index;
 491
 492         werr = smbconf_txt_load_file(ctx);
 493         if (!W_ERROR_IS_OK(werr)) {
 494                 return werr;
 495         }
 496
 497         found = smbconf_find_in_array(service,
 498                                       pd(ctx)->cache->share_names,
 499                                       pd(ctx)->cache->num_shares,
 500                                       &share_index);
 501         if (!found) {
 502                 return WERR_NO_SUCH_SERVICE;
 503         }
 504
 505         found = smbconf_reverse_find_in_array(param,
 506                                 pd(ctx)->cache->param_names[share_index],
 507                                 pd(ctx)->cache->num_params[share_index],
 508                                 &param_index);
 509         if (!found) {
 510                 return WERR_INVALID_PARAM;
 511         }
 512
 513         *valstr = talloc_strdup(mem_ctx,
 514                         pd(ctx)->cache->param_values[share_index][param_index]);
 515
 516         if (*valstr == NULL) {
 517                 return WERR_NOMEM;
 518         }
 519
 520         return WERR_OK;
 521 }
 522
 523 /**
 524  * delete a parameter from configuration
 525  */
 526 static WERROR smbconf_txt_delete_parameter(struct smbconf_ctx *ctx,
 527                                            const char *service,
 528                                            const char *param)
 529 {
 530         return WERR_NOT_SUPPORTED;
 531 }
 532
 533 static WERROR smbconf_txt_get_includes(struct smbconf_ctx *ctx,
 534                                        TALLOC_CTX *mem_ctx,
 535                                        const char *service,
 536                                        uint32_t *num_includes,
 537                                        char ***includes)
 538 {
 539         WERROR werr;
 540         bool found;
 541         uint32_t sidx, count;
 542         TALLOC_CTX *tmp_ctx = NULL;
 543         uint32_t tmp_num_includes = 0;
 544         char **tmp_includes = NULL;
 545
 546         werr = smbconf_txt_load_file(ctx);
 547         if (!W_ERROR_IS_OK(werr)) {
 548                 return werr;
 549         }
 550
 551         found = smbconf_find_in_array(service,
 552                                       pd(ctx)->cache->share_names,
 553                                       pd(ctx)->cache->num_shares,
 554                                       &sidx);
 555         if (!found) {
 556                 return WERR_NO_SUCH_SERVICE;
 557         }
 558
 559         tmp_ctx = talloc_stackframe();
 560
 561         for (count = 0; count < pd(ctx)->cache->num_params[sidx]; count++) {
 562                 if (strequal(pd(ctx)->cache->param_names[sidx][count],
 563                              "include"))
 564                 {
 565                         werr = smbconf_add_string_to_array(tmp_ctx,
 566                                 &tmp_includes,
 567                                 tmp_num_includes,
 568                                 pd(ctx)->cache->param_values[sidx][count]);
 569                         if (!W_ERROR_IS_OK(werr)) {
 570                                 goto done;
 571                         }
 572                         tmp_num_includes++;
 573                 }
 574         }
 575
 576         *num_includes = tmp_num_includes;
 577         if (*num_includes > 0) {
 578                 *includes = talloc_move(mem_ctx, &tmp_includes);
 579                 if (*includes == NULL) {
 580                         werr = WERR_NOMEM;
 581                         goto done;
 582                 }
 583         } else {
 584                 *includes = NULL;
 585         }
 586
 587         werr = WERR_OK;
 588
 589 done:
 590         TALLOC_FREE(tmp_ctx);
 591         return werr;
 592 }
 593
 594 static WERROR smbconf_txt_set_includes(struct smbconf_ctx *ctx,
 595                                        const char *service,
 596                                        uint32_t num_includes,
 597                                        const char **includes)
 598 {
 599         return WERR_NOT_SUPPORTED;
 600 }
 601
 602 static WERROR smbconf_txt_delete_includes(struct smbconf_ctx *ctx,
 603                                           const char *service)
 604 {
 605         return WERR_NOT_SUPPORTED;
 606 }
 607
 608
 609 static struct smbconf_ops smbconf_ops_txt = {
 610         .init                   = smbconf_txt_init,
 611         .shutdown               = smbconf_txt_shutdown,
 612         .requires_messaging     = smbconf_txt_requires_messaging,
 613         .open_conf              = smbconf_txt_open,
 614         .close_conf             = smbconf_txt_close,
 615         .get_csn                = smbconf_txt_get_csn,
 616         .drop                   = smbconf_txt_drop,
 617         .get_share_names        = smbconf_txt_get_share_names,
 618         .share_exists           = smbconf_txt_share_exists,
 619         .create_share           = smbconf_txt_create_share,
 620         .get_share              = smbconf_txt_get_share,
 621         .delete_share           = smbconf_txt_delete_share,
 622         .set_parameter          = smbconf_txt_set_parameter,
 623         .get_parameter          = smbconf_txt_get_parameter,
 624         .delete_parameter       = smbconf_txt_delete_parameter,
 625         .get_includes           = smbconf_txt_get_includes,
 626         .set_includes           = smbconf_txt_set_includes,
 627         .delete_includes        = smbconf_txt_delete_includes,
 628 };
 629
 630
 631 /**
 632  * initialize the smbconf text backend
 633  * the only function that is exported from this module
 634  */
 635 WERROR smbconf_init_txt(TALLOC_CTX *mem_ctx,
 636                         struct smbconf_ctx **conf_ctx,
 637                         const char *path)
 638 {
 639         WERROR werr;
 640
 641         werr = smbconf_init_internal(mem_ctx, conf_ctx, path, &smbconf_ops_txt);
 642         if (!W_ERROR_IS_OK(werr)) {
 643                 return werr;
 644         }
 645
 646         return smbconf_txt_load_file(*conf_ctx);
 647 }