src/namestore/plugin_namestore_sqlite.c

   1 /*
   2  * This file is part of GNUnet
   3  * Copyright (C) 2009-2017 GNUnet e.V.
   4  *
   5  * GNUnet is free software: you can redistribute it and/or modify it
   6  * under the terms of the GNU Affero General Public License as published
   7  * by the Free Software Foundation, either version 3 of the License,
   8  * or (at your option) any later version.
   9  *
  10  * GNUnet is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Affero General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Affero General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18      SPDX-License-Identifier: AGPL3.0-or-later
  19  */
  20
  21 /**
  22  * @file namestore/plugin_namestore_sqlite.c
  23  * @brief sqlite-based namestore backend
  24  * @author Christian Grothoff
  25  */
  26
  27 #include "platform.h"
  28 #include "gnunet_namestore_plugin.h"
  29 #include "gnunet_namestore_service.h"
  30 #include "gnunet_gnsrecord_lib.h"
  31 #include "gnunet_sq_lib.h"
  32 #include "namestore.h"
  33 #include <sqlite3.h>
  34
  35 /**
  36  * After how many ms "busy" should a DB operation fail for good?  A
  37  * low value makes sure that we are more responsive to requests
  38  * (especially PUTs).  A high value guarantees a higher success rate
  39  * (SELECTs in iterate can take several seconds despite LIMIT=1).
  40  *
  41  * The default value of 1s should ensure that users do not experience
  42  * huge latencies while at the same time allowing operations to
  43  * succeed with reasonable probability.
  44  */
  45 #define BUSY_TIMEOUT_MS 1000
  46
  47
  48 /**
  49  * Log an error message at log-level 'level' that indicates
  50  * a failure of the command 'cmd' on file 'filename'
  51  * with the message given by strerror(errno).
  52  */
  53 #define LOG_SQLITE(db, level, cmd) do { GNUNET_log_from(level, "namestore-sqlite", _("`%s' failed at %s:%d with error: %s\n"), cmd, __FILE__, __LINE__, sqlite3_errmsg(db->dbh)); } while (0)
  54
  55 #define LOG(kind, ...) GNUNET_log_from(kind, "namestore-sqlite", __VA_ARGS__)
  56
  57
  58 /**
  59  * Context for all functions in this plugin.
  60  */
  61 struct Plugin {
  62   const struct GNUNET_CONFIGURATION_Handle *cfg;
  63
  64   /**
  65    * Database filename.
  66    */
  67   char *fn;
  68
  69   /**
  70    * Native SQLite database handle.
  71    */
  72   sqlite3 *dbh;
  73
  74   /**
  75    * Precompiled SQL to store records.
  76    */
  77   sqlite3_stmt *store_records;
  78
  79   /**
  80    * Precompiled SQL to deltete existing records.
  81    */
  82   sqlite3_stmt *delete_records;
  83
  84   /**
  85    * Precompiled SQL for iterate records within a zone.
  86    */
  87   sqlite3_stmt *iterate_zone;
  88
  89   /**
  90    * Precompiled SQL for iterate all records within all zones.
  91    */
  92   sqlite3_stmt *iterate_all_zones;
  93
  94   /**
  95    * Precompiled SQL to for reverse lookup based on PKEY.
  96    */
  97   sqlite3_stmt *zone_to_name;
  98
  99   /**
 100    * Precompiled SQL to lookup records based on label.
 101    */
 102   sqlite3_stmt *lookup_label;
 103 };
 104
 105
 106 /**
 107  * Initialize the database connections and associated
 108  * data structures (create tables and indices
 109  * as needed as well).
 110  *
 111  * @param plugin the plugin context (state for this module)
 112  * @return #GNUNET_OK on success
 113  */
 114 static int
 115 database_setup(struct Plugin *plugin)
 116 {
 117   char *sqlite_filename;
 118   struct GNUNET_SQ_ExecuteStatement es[] = {
 119     GNUNET_SQ_make_try_execute("PRAGMA temp_store=MEMORY"),
 120     GNUNET_SQ_make_try_execute("PRAGMA synchronous=NORMAL"),
 121     GNUNET_SQ_make_try_execute("PRAGMA legacy_file_format=OFF"),
 122     GNUNET_SQ_make_try_execute("PRAGMA auto_vacuum=INCREMENTAL"),
 123     GNUNET_SQ_make_try_execute("PRAGMA encoding=\"UTF-8\""),
 124     GNUNET_SQ_make_try_execute("PRAGMA locking_mode=EXCLUSIVE"),
 125     GNUNET_SQ_make_try_execute("PRAGMA journal_mode=WAL"),
 126     GNUNET_SQ_make_try_execute("PRAGMA page_size=4092"),
 127     GNUNET_SQ_make_execute("CREATE TABLE IF NOT EXISTS ns098records ("
 128                            " uid INTEGER PRIMARY KEY,"
 129                            " zone_private_key BLOB NOT NULL,"
 130                            " pkey BLOB,"
 131                            " rvalue INT8 NOT NULL,"
 132                            " record_count INT NOT NULL,"
 133                            " record_data BLOB NOT NULL,"
 134                            " label TEXT NOT NULL"
 135                            ")"),
 136     GNUNET_SQ_make_try_execute("CREATE INDEX IF NOT EXISTS ir_pkey_reverse "
 137                                "ON ns098records (zone_private_key,pkey)"),
 138     GNUNET_SQ_make_try_execute("CREATE INDEX IF NOT EXISTS ir_pkey_iter "
 139                                "ON ns098records (zone_private_key,uid)"),
 140     GNUNET_SQ_EXECUTE_STATEMENT_END
 141   };
 142   struct GNUNET_SQ_PrepareStatement ps[] = {
 143     GNUNET_SQ_make_prepare("INSERT INTO ns098records "
 144                            "(zone_private_key,pkey,rvalue,record_count,record_data,label)"
 145                            " VALUES (?, ?, ?, ?, ?, ?)",
 146                            &plugin->store_records),
 147     GNUNET_SQ_make_prepare("DELETE FROM ns098records "
 148                            "WHERE zone_private_key=? AND label=?",
 149                            &plugin->delete_records),
 150     GNUNET_SQ_make_prepare("SELECT uid,record_count,record_data,label"
 151                            " FROM ns098records"
 152                            " WHERE zone_private_key=? AND pkey=?",
 153                            &plugin->zone_to_name),
 154     GNUNET_SQ_make_prepare("SELECT uid,record_count,record_data,label"
 155                            " FROM ns098records"
 156                            " WHERE zone_private_key=? AND uid > ?"
 157                            " ORDER BY uid ASC"
 158                            " LIMIT ?",
 159                            &plugin->iterate_zone),
 160     GNUNET_SQ_make_prepare("SELECT uid,record_count,record_data,label,zone_private_key"
 161                            " FROM ns098records"
 162                            " WHERE uid > ?"
 163                            " ORDER BY uid ASC"
 164                            " LIMIT ?",
 165                            &plugin->iterate_all_zones),
 166     GNUNET_SQ_make_prepare("SELECT uid,record_count,record_data,label"
 167                            " FROM ns098records"
 168                            " WHERE zone_private_key=? AND label=?",
 169                            &plugin->lookup_label),
 170     GNUNET_SQ_PREPARE_END
 171   };
 172
 173   if (GNUNET_OK !=
 174       GNUNET_CONFIGURATION_get_value_filename(plugin->cfg,
 175                                               "namestore-sqlite",
 176                                               "FILENAME",
 177                                               &sqlite_filename))
 178     {
 179       GNUNET_log_config_missing(GNUNET_ERROR_TYPE_ERROR,
 180                                 "namestore-sqlite",
 181                                 "FILENAME");
 182       return GNUNET_SYSERR;
 183     }
 184   if (GNUNET_OK !=
 185       GNUNET_DISK_file_test(sqlite_filename))
 186     {
 187       if (GNUNET_OK !=
 188           GNUNET_DISK_directory_create_for_file(sqlite_filename))
 189         {
 190           GNUNET_break(0);
 191           GNUNET_free(sqlite_filename);
 192           return GNUNET_SYSERR;
 193         }
 194     }
 195   /* sqlite_filename should be UTF-8-encoded. If it isn't, it's a bug */
 196   plugin->fn = sqlite_filename;
 197
 198   /* Open database and precompile statements */
 199   if (SQLITE_OK !=
 200       sqlite3_open(plugin->fn,
 201                    &plugin->dbh))
 202     {
 203       LOG(GNUNET_ERROR_TYPE_ERROR,
 204           _("Unable to initialize SQLite: %s.\n"),
 205           sqlite3_errmsg(plugin->dbh));
 206       return GNUNET_SYSERR;
 207     }
 208   GNUNET_break(SQLITE_OK ==
 209                sqlite3_busy_timeout(plugin->dbh,
 210                                     BUSY_TIMEOUT_MS));
 211   if (GNUNET_OK !=
 212       GNUNET_SQ_exec_statements(plugin->dbh,
 213                                 es))
 214     {
 215       GNUNET_break(0);
 216       LOG(GNUNET_ERROR_TYPE_ERROR,
 217           _("Failed to setup database at `%s'\n"),
 218           plugin->fn);
 219       return GNUNET_SYSERR;
 220     }
 221
 222   if (GNUNET_OK !=
 223       GNUNET_SQ_prepare(plugin->dbh,
 224                         ps))
 225     {
 226       GNUNET_break(0);
 227       LOG(GNUNET_ERROR_TYPE_ERROR,
 228           _("Failed to setup database at `%s'\n"),
 229           plugin->fn);
 230       return GNUNET_SYSERR;
 231     }
 232   return GNUNET_OK;
 233 }
 234
 235
 236 /**
 237  * Shutdown database connection and associate data
 238  * structures.
 239  * @param plugin the plugin context (state for this module)
 240  */
 241 static void
 242 database_shutdown(struct Plugin *plugin)
 243 {
 244   int result;
 245   sqlite3_stmt *stmt;
 246
 247   if (NULL != plugin->store_records)
 248     sqlite3_finalize(plugin->store_records);
 249   if (NULL != plugin->delete_records)
 250     sqlite3_finalize(plugin->delete_records);
 251   if (NULL != plugin->iterate_zone)
 252     sqlite3_finalize(plugin->iterate_zone);
 253   if (NULL != plugin->iterate_all_zones)
 254     sqlite3_finalize(plugin->iterate_all_zones);
 255   if (NULL != plugin->zone_to_name)
 256     sqlite3_finalize(plugin->zone_to_name);
 257   if (NULL != plugin->lookup_label)
 258     sqlite3_finalize(plugin->lookup_label);
 259   result = sqlite3_close(plugin->dbh);
 260   if (result == SQLITE_BUSY)
 261     {
 262       LOG(GNUNET_ERROR_TYPE_WARNING,
 263           _("Tried to close sqlite without finalizing all prepared statements.\n"));
 264       stmt = sqlite3_next_stmt(plugin->dbh,
 265                                NULL);
 266       while (NULL != stmt)
 267         {
 268           GNUNET_log_from(GNUNET_ERROR_TYPE_DEBUG,
 269                           "sqlite",
 270                           "Closing statement %p\n",
 271                           stmt);
 272           result = sqlite3_finalize(stmt);
 273           if (result != SQLITE_OK)
 274             GNUNET_log_from(GNUNET_ERROR_TYPE_WARNING,
 275                             "sqlite",
 276                             "Failed to close statement %p: %d\n",
 277                             stmt,
 278                             result);
 279           stmt = sqlite3_next_stmt(plugin->dbh,
 280                                    NULL);
 281         }
 282       result = sqlite3_close(plugin->dbh);
 283     }
 284   if (SQLITE_OK != result)
 285     LOG_SQLITE(plugin,
 286                GNUNET_ERROR_TYPE_ERROR,
 287                "sqlite3_close");
 288
 289   GNUNET_free_non_null(plugin->fn);
 290 }
 291
 292
 293 /**
 294  * Store a record in the datastore.  Removes any existing record in the
 295  * same zone with the same name.
 296  *
 297  * @param cls closure (internal context for the plugin)
 298  * @param zone_key private key of the zone
 299  * @param label name that is being mapped (at most 255 characters long)
 300  * @param rd_count number of entries in @a rd array
 301  * @param rd array of records with data to store
 302  * @return #GNUNET_OK on success, else #GNUNET_SYSERR
 303  */
 304 static int
 305 namestore_sqlite_store_records(void *cls,
 306                                const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone_key,
 307                                const char *label,
 308                                unsigned int rd_count,
 309                                const struct GNUNET_GNSRECORD_Data *rd)
 310 {
 311   struct Plugin *plugin = cls;
 312   int n;
 313   struct GNUNET_CRYPTO_EcdsaPublicKey pkey;
 314   uint64_t rvalue;
 315   ssize_t data_size;
 316
 317   memset(&pkey,
 318          0,
 319          sizeof(pkey));
 320   for (unsigned int i = 0; i < rd_count; i++)
 321     if (GNUNET_GNSRECORD_TYPE_PKEY == rd[i].record_type)
 322       {
 323         GNUNET_break(sizeof(struct GNUNET_CRYPTO_EcdsaPublicKey) ==
 324                      rd[i].data_size);
 325         GNUNET_memcpy(&pkey,
 326                       rd[i].data,
 327                       rd[i].data_size);
 328         break;
 329       }
 330   rvalue = GNUNET_CRYPTO_random_u64(GNUNET_CRYPTO_QUALITY_WEAK,
 331                                     UINT64_MAX);
 332   data_size = GNUNET_GNSRECORD_records_get_size(rd_count,
 333                                                 rd);
 334   if (data_size < 0)
 335     {
 336       GNUNET_break(0);
 337       return GNUNET_SYSERR;
 338     }
 339   if (data_size > 64 * 65536)
 340     {
 341       GNUNET_break(0);
 342       return GNUNET_SYSERR;
 343     }
 344   {
 345     /* First delete 'old' records */
 346     char data[data_size];
 347     struct GNUNET_SQ_QueryParam dparams[] = {
 348       GNUNET_SQ_query_param_auto_from_type(zone_key),
 349       GNUNET_SQ_query_param_string(label),
 350       GNUNET_SQ_query_param_end
 351     };
 352     ssize_t ret;
 353
 354     ret = GNUNET_GNSRECORD_records_serialize(rd_count,
 355                                              rd,
 356                                              data_size,
 357                                              data);
 358     if ((ret < 0) ||
 359         (data_size != ret))
 360       {
 361         GNUNET_break(0);
 362         return GNUNET_SYSERR;
 363       }
 364     if (GNUNET_OK !=
 365         GNUNET_SQ_bind(plugin->delete_records,
 366                        dparams))
 367       {
 368         LOG_SQLITE(plugin,
 369                    GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
 370                    "sqlite3_bind_XXXX");
 371         GNUNET_SQ_reset(plugin->dbh,
 372                         plugin->delete_records);
 373         return GNUNET_SYSERR;
 374       }
 375     n = sqlite3_step(plugin->delete_records);
 376     GNUNET_SQ_reset(plugin->dbh,
 377                     plugin->delete_records);
 378
 379     if (0 != rd_count)
 380       {
 381         uint32_t rd_count32 = (uint32_t)rd_count;
 382         struct GNUNET_SQ_QueryParam sparams[] = {
 383           GNUNET_SQ_query_param_auto_from_type(zone_key),
 384           GNUNET_SQ_query_param_auto_from_type(&pkey),
 385           GNUNET_SQ_query_param_uint64(&rvalue),
 386           GNUNET_SQ_query_param_uint32(&rd_count32),
 387           GNUNET_SQ_query_param_fixed_size(data, data_size),
 388           GNUNET_SQ_query_param_string(label),
 389           GNUNET_SQ_query_param_end
 390         };
 391
 392         if (GNUNET_OK !=
 393             GNUNET_SQ_bind(plugin->store_records,
 394                            sparams))
 395           {
 396             LOG_SQLITE(plugin,
 397                        GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
 398                        "sqlite3_bind_XXXX");
 399             GNUNET_SQ_reset(plugin->dbh,
 400                             plugin->store_records);
 401             return GNUNET_SYSERR;
 402           }
 403         n = sqlite3_step(plugin->store_records);
 404         GNUNET_SQ_reset(plugin->dbh,
 405                         plugin->store_records);
 406       }
 407   }
 408   switch (n)
 409     {
 410     case SQLITE_DONE:
 411       if (0 != rd_count)
 412         GNUNET_log_from(GNUNET_ERROR_TYPE_DEBUG,
 413                         "sqlite",
 414                         "Record stored\n");
 415       else
 416         GNUNET_log_from(GNUNET_ERROR_TYPE_DEBUG,
 417                         "sqlite",
 418                         "Record deleted\n");
 419       return GNUNET_OK;
 420
 421     case SQLITE_BUSY:
 422       LOG_SQLITE(plugin,
 423                  GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
 424                  "sqlite3_step");
 425       return GNUNET_NO;
 426
 427     default:
 428       LOG_SQLITE(plugin,
 429                  GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
 430                  "sqlite3_step");
 431       return GNUNET_SYSERR;
 432     }
 433 }
 434
 435
 436 /**
 437  * The given 'sqlite' statement has been prepared to be run.
 438  * It will return a record which should be given to the iterator.
 439  * Runs the statement and parses the returned record.
 440  *
 441  * @param plugin plugin context
 442  * @param stmt to run (and then clean up)
 443  * @param zone_key private key of the zone
 444  * @param limit maximum number of results to fetch
 445  * @param iter iterator to call with the result
 446  * @param iter_cls closure for @a iter
 447  * @return #GNUNET_OK on success, #GNUNET_NO if there were no results, #GNUNET_SYSERR on error
 448  */
 449 static int
 450 get_records_and_call_iterator(struct Plugin *plugin,
 451                               sqlite3_stmt *stmt,
 452                               const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone_key,
 453                               uint64_t limit,
 454                               GNUNET_NAMESTORE_RecordIterator iter,
 455                               void *iter_cls)
 456 {
 457   int ret;
 458   int sret;
 459
 460   ret = GNUNET_OK;
 461   for (uint64_t i = 0; i < limit; i++)
 462     {
 463       sret = sqlite3_step(stmt);
 464
 465       if (SQLITE_DONE == sret)
 466         {
 467           GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 468                      "Iteration done (no results)\n");
 469           ret = GNUNET_NO;
 470           break;
 471         }
 472       if (SQLITE_ROW != sret)
 473         {
 474           LOG_SQLITE(plugin,
 475                      GNUNET_ERROR_TYPE_ERROR,
 476                      "sqlite_step");
 477           ret = GNUNET_SYSERR;
 478           break;
 479         }
 480
 481       {
 482         uint64_t seq;
 483         uint32_t record_count;
 484         size_t data_size;
 485         void *data;
 486         char *label;
 487         struct GNUNET_CRYPTO_EcdsaPrivateKey zk;
 488         struct GNUNET_SQ_ResultSpec rs[] = {
 489           GNUNET_SQ_result_spec_uint64(&seq),
 490           GNUNET_SQ_result_spec_uint32(&record_count),
 491           GNUNET_SQ_result_spec_variable_size(&data,
 492                                               &data_size),
 493           GNUNET_SQ_result_spec_string(&label),
 494           GNUNET_SQ_result_spec_end
 495         };
 496         struct GNUNET_SQ_ResultSpec rsx[] = {
 497           GNUNET_SQ_result_spec_uint64(&seq),
 498           GNUNET_SQ_result_spec_uint32(&record_count),
 499           GNUNET_SQ_result_spec_variable_size(&data,
 500                                               &data_size),
 501           GNUNET_SQ_result_spec_string(&label),
 502           GNUNET_SQ_result_spec_auto_from_type(&zk),
 503           GNUNET_SQ_result_spec_end
 504         };
 505
 506         ret = GNUNET_SQ_extract_result(stmt,
 507                                        (NULL == zone_key)
 508                                        ? rsx
 509                                        : rs);
 510         if ((GNUNET_OK != ret) ||
 511             (record_count > 64 * 1024))
 512           {
 513             /* sanity check, don't stack allocate far too much just
 514                because database might contain a large value here */
 515             GNUNET_break(0);
 516             ret = GNUNET_SYSERR;
 517             break;
 518           }
 519         else
 520           {
 521             struct GNUNET_GNSRECORD_Data rd[record_count];
 522
 523             GNUNET_assert(0 != seq);
 524             if (GNUNET_OK !=
 525                 GNUNET_GNSRECORD_records_deserialize(data_size,
 526                                                      data,
 527                                                      record_count,
 528                                                      rd))
 529               {
 530                 GNUNET_break(0);
 531                 ret = GNUNET_SYSERR;
 532                 break;
 533               }
 534             else
 535               {
 536                 if (NULL != zone_key)
 537                   zk = *zone_key;
 538                 if (NULL != iter)
 539                   iter(iter_cls,
 540                        seq,
 541                        &zk,
 542                        label,
 543                        record_count,
 544                        rd);
 545               }
 546           }
 547         GNUNET_SQ_cleanup_result(rs);
 548       }
 549     }
 550   GNUNET_SQ_reset(plugin->dbh,
 551                   stmt);
 552   return ret;
 553 }
 554
 555
 556 /**
 557  * Lookup records in the datastore for which we are the authority.
 558  *
 559  * @param cls closure (internal context for the plugin)
 560  * @param zone private key of the zone
 561  * @param label name of the record in the zone
 562  * @param iter function to call with the result
 563  * @param iter_cls closure for @a iter
 564  * @return #GNUNET_OK on success, #GNUNET_NO for no results, else #GNUNET_SYSERR
 565  */
 566 static int
 567 namestore_sqlite_lookup_records(void *cls,
 568                                 const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone,
 569                                 const char *label,
 570                                 GNUNET_NAMESTORE_RecordIterator iter,
 571                                 void *iter_cls)
 572 {
 573   struct Plugin *plugin = cls;
 574   struct GNUNET_SQ_QueryParam params[] = {
 575     GNUNET_SQ_query_param_auto_from_type(zone),
 576     GNUNET_SQ_query_param_string(label),
 577     GNUNET_SQ_query_param_end
 578   };
 579
 580   if (NULL == zone)
 581     {
 582       GNUNET_break(0);
 583       return GNUNET_SYSERR;
 584     }
 585   if (GNUNET_OK !=
 586       GNUNET_SQ_bind(plugin->lookup_label,
 587                      params))
 588     {
 589       LOG_SQLITE(plugin, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
 590                  "sqlite3_bind_XXXX");
 591       GNUNET_SQ_reset(plugin->dbh,
 592                       plugin->lookup_label);
 593       return GNUNET_SYSERR;
 594     }
 595   return get_records_and_call_iterator(plugin,
 596                                        plugin->lookup_label,
 597                                        zone,
 598                                        1,
 599                                        iter,
 600                                        iter_cls);
 601 }
 602
 603
 604 /**
 605  * Iterate over the results for a particular key and zone in the
 606  * datastore.  Will return at most one result to the iterator.
 607  *
 608  * @param cls closure (internal context for the plugin)
 609  * @param zone hash of public key of the zone, NULL to iterate over all zones
 610  * @param serial serial number to exclude in the list of all matching records
 611  * @param limit maximum number of results to return
 612  * @param iter function to call with the result
 613  * @param iter_cls closure for @a iter
 614  * @return #GNUNET_OK on success, #GNUNET_NO if there were no more results, #GNUNET_SYSERR on error
 615  */
 616 static int
 617 namestore_sqlite_iterate_records(void *cls,
 618                                  const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone,
 619                                  uint64_t serial,
 620                                  uint64_t limit,
 621                                  GNUNET_NAMESTORE_RecordIterator iter,
 622                                  void *iter_cls)
 623 {
 624   struct Plugin *plugin = cls;
 625   sqlite3_stmt *stmt;
 626   int err;
 627
 628   if (NULL == zone)
 629     {
 630       struct GNUNET_SQ_QueryParam params[] = {
 631         GNUNET_SQ_query_param_uint64(&serial),
 632         GNUNET_SQ_query_param_uint64(&limit),
 633         GNUNET_SQ_query_param_end
 634       };
 635
 636       stmt = plugin->iterate_all_zones;
 637       err = GNUNET_SQ_bind(stmt,
 638                            params);
 639     }
 640   else
 641     {
 642       struct GNUNET_SQ_QueryParam params[] = {
 643         GNUNET_SQ_query_param_auto_from_type(zone),
 644         GNUNET_SQ_query_param_uint64(&serial),
 645         GNUNET_SQ_query_param_uint64(&limit),
 646         GNUNET_SQ_query_param_end
 647       };
 648
 649       stmt = plugin->iterate_zone;
 650       err = GNUNET_SQ_bind(stmt,
 651                            params);
 652     }
 653   if (GNUNET_OK != err)
 654     {
 655       LOG_SQLITE(plugin,
 656                  GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
 657                  "sqlite3_bind_XXXX");
 658       GNUNET_SQ_reset(plugin->dbh,
 659                       stmt);
 660       return GNUNET_SYSERR;
 661     }
 662   return get_records_and_call_iterator(plugin,
 663                                        stmt,
 664                                        zone,
 665                                        limit,
 666                                        iter,
 667                                        iter_cls);
 668 }
 669
 670
 671 /**
 672  * Look for an existing PKEY delegation record for a given public key.
 673  * Returns at most one result to the iterator.
 674  *
 675  * @param cls closure (internal context for the plugin)
 676  * @param zone private key of the zone to look up in, never NULL
 677  * @param value_zone public key of the target zone (value), never NULL
 678  * @param iter function to call with the result
 679  * @param iter_cls closure for @a iter
 680  * @return #GNUNET_OK on success, #GNUNET_NO if there were no results, #GNUNET_SYSERR on error
 681  */
 682 static int
 683 namestore_sqlite_zone_to_name(void *cls,
 684                               const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone,
 685                               const struct GNUNET_CRYPTO_EcdsaPublicKey *value_zone,
 686                               GNUNET_NAMESTORE_RecordIterator iter,
 687                               void *iter_cls)
 688 {
 689   struct Plugin *plugin = cls;
 690   struct GNUNET_SQ_QueryParam params[] = {
 691     GNUNET_SQ_query_param_auto_from_type(zone),
 692     GNUNET_SQ_query_param_auto_from_type(value_zone),
 693     GNUNET_SQ_query_param_end
 694   };
 695
 696   if (GNUNET_OK !=
 697       GNUNET_SQ_bind(plugin->zone_to_name,
 698                      params))
 699     {
 700       LOG_SQLITE(plugin,
 701                  GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
 702                  "sqlite3_bind_XXXX");
 703       GNUNET_SQ_reset(plugin->dbh,
 704                       plugin->zone_to_name);
 705       return GNUNET_SYSERR;
 706     }
 707   LOG(GNUNET_ERROR_TYPE_DEBUG,
 708       "Performing reverse lookup for `%s'\n",
 709       GNUNET_GNSRECORD_z2s(value_zone));
 710   return get_records_and_call_iterator(plugin,
 711                                        plugin->zone_to_name,
 712                                        zone,
 713                                        1,
 714                                        iter,
 715                                        iter_cls);
 716 }
 717
 718
 719 /**
 720  * Entry point for the plugin.
 721  *
 722  * @param cls the "struct GNUNET_NAMESTORE_PluginEnvironment*"
 723  * @return NULL on error, otherwise the plugin context
 724  */
 725 void *
 726 libgnunet_plugin_namestore_sqlite_init(void *cls)
 727 {
 728   static struct Plugin plugin;
 729   const struct GNUNET_CONFIGURATION_Handle *cfg = cls;
 730   struct GNUNET_NAMESTORE_PluginFunctions *api;
 731
 732   if (NULL != plugin.cfg)
 733     return NULL;                /* can only initialize once! */
 734   memset(&plugin,
 735          0,
 736          sizeof(struct Plugin));
 737   plugin.cfg = cfg;
 738   if (GNUNET_OK != database_setup(&plugin))
 739     {
 740       database_shutdown(&plugin);
 741       return NULL;
 742     }
 743   api = GNUNET_new(struct GNUNET_NAMESTORE_PluginFunctions);
 744   api->cls = &plugin;
 745   api->store_records = &namestore_sqlite_store_records;
 746   api->iterate_records = &namestore_sqlite_iterate_records;
 747   api->zone_to_name = &namestore_sqlite_zone_to_name;
 748   api->lookup_records = &namestore_sqlite_lookup_records;
 749   LOG(GNUNET_ERROR_TYPE_INFO,
 750       _("Sqlite database running\n"));
 751   return api;
 752 }
 753
 754
 755 /**
 756  * Exit point from the plugin.
 757  *
 758  * @param cls the plugin context (as returned by "init")
 759  * @return always NULL
 760  */
 761 void *
 762 libgnunet_plugin_namestore_sqlite_done(void *cls)
 763 {
 764   struct GNUNET_NAMESTORE_PluginFunctions *api = cls;
 765   struct Plugin *plugin = api->cls;
 766
 767   database_shutdown(plugin);
 768   plugin->cfg = NULL;
 769   GNUNET_free(api);
 770   LOG(GNUNET_ERROR_TYPE_DEBUG,
 771       "sqlite plugin is finished\n");
 772   return NULL;
 773 }
 774
 775 /* end of plugin_namestore_sqlite.c */