src/gns/gnunet-service-gns.c

   1 /*
   2      This file is part of GNUnet.
   3      (C) 2011-2013 Christian Grothoff (and other contributing authors)
   4
   5      GNUnet is free software; you can redistribute it and/or modify
   6      it under the terms of the GNU General Public License as published
   7      by the Free Software Foundation; either version 3, or (at your
   8      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      General Public License for more details.
  14
  15      You should have received a copy of the GNU General Public License
  16      along with GNUnet; see the file COPYING.  If not, write to the
  17      Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18      Boston, MA 02111-1307, USA.
  19 */
  20 /**
  21  * @file gns/gnunet-service-gns.c
  22  * @brief GNUnet GNS service
  23  * @author Martin Schanzenbach
  24  * @author Christian Grothoff
  25  *
  26  * TODO:
  27  * - conversion of private to public records does NOT check if the
  28  *   records are actually public
  29  * - need to watch for client disconnects and abort operations on
  30  *   disconnect
  31  */
  32 #include "platform.h"
  33 #include "gnunet_util_lib.h"
  34 #include "gnunet_transport_service.h"
  35 #include "gnunet_dns_service.h"
  36 #include "gnunet_dnsparser_lib.h"
  37 #include "gnunet_dht_service.h"
  38 #include "gnunet_namestore_service.h"
  39 #include "gnunet_gns_service.h"
  40 #include "gnunet_statistics_service.h"
  41 #include "gns.h"
  42 #include "gns_common.h"
  43 #include "gnunet-service-gns_resolver.h"
  44 #include "gnunet-service-gns_interceptor.h"
  45 #include "gnunet_protocols.h"
  46
  47 /**
  48  * The initial interval in milliseconds btween puts in
  49  * a zone iteration
  50  */
  51 #define INITIAL_PUT_INTERVAL GNUNET_TIME_UNIT_MILLISECONDS
  52
  53 /**
  54  * The upper bound for the zone iteration interval in milliseconds
  55  */
  56 #define MINIMUM_ZONE_ITERATION_INTERVAL GNUNET_TIME_UNIT_SECONDS
  57
  58 /**
  59  * The default put interval for the zone iteration. In case
  60  * no option is found
  61  */
  62 #define DEFAULT_ZONE_PUBLISH_TIME_WINDOW GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 4)
  63
  64 /**
  65  * The factor the current zone iteration interval is divided by for each
  66  * additional new record
  67  */
  68 #define LATE_ITERATION_SPEEDUP_FACTOR 2
  69
  70 /**
  71  * How long until a DHT PUT attempt should time out?
  72  */
  73 #define DHT_OPERATION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 60)
  74
  75 /**
  76  * What replication level do we use for DHT PUT operations?
  77  */
  78 #define DHT_GNS_REPLICATION_LEVEL 5
  79
  80
  81 /**
  82  * Handle to a lookup operation from api
  83  */
  84 struct ClientLookupHandle
  85 {
  86
  87   /**
  88    * We keep these in a DLL.
  89    */
  90   struct ClientLookupHandle *next;
  91
  92   /**
  93    * We keep these in a DLL.
  94    */
  95   struct ClientLookupHandle *prev;
  96
  97   /**
  98    * Handle to the requesting client
  99    */
 100   struct GNUNET_SERVER_Client *client;
 101
 102   /**
 103    * Active handle for the lookup.
 104    */
 105   struct GNS_ResolverHandle *lookup;
 106
 107   /**
 108    * request id
 109    */
 110   uint32_t request_id;
 111
 112 };
 113
 114
 115 /**
 116  * Our handle to the DHT
 117  */
 118 static struct GNUNET_DHT_Handle *dht_handle;
 119
 120 /**
 121  * Active DHT put operation (or NULL)
 122  */
 123 static struct GNUNET_DHT_PutHandle *active_put;
 124
 125 /**
 126  * Our handle to the namestore service
 127  */
 128 static struct GNUNET_NAMESTORE_Handle *namestore_handle;
 129
 130 /**
 131  * Handle to iterate over our authoritative zone in namestore
 132  */
 133 static struct GNUNET_NAMESTORE_ZoneIterator *namestore_iter;
 134
 135 /**
 136  * Our notification context.
 137  */
 138 static struct GNUNET_SERVER_NotificationContext *nc;
 139
 140 /**
 141  * Head of the DLL.
 142  */
 143 static struct ClientLookupHandle *clh_head;
 144
 145 /**
 146  * Tail of the DLL.
 147  */
 148 static struct ClientLookupHandle *clh_tail;
 149
 150 /**
 151  * Useful for zone update for DHT put
 152  */
 153 static unsigned long long num_public_records;
 154
 155 /**
 156  * Last seen record count
 157  */
 158 static unsigned long long last_num_public_records;
 159
 160 /**
 161  * Zone iteration PUT interval.
 162  */
 163 static struct GNUNET_TIME_Relative put_interval;
 164
 165 /**
 166  * Time window for zone iteration
 167  */
 168 static struct GNUNET_TIME_Relative zone_publish_time_window;
 169
 170 /**
 171  * zone publish task
 172  */
 173 static GNUNET_SCHEDULER_TaskIdentifier zone_publish_task;
 174
 175 /**
 176  * #GNUNET_YES if zone has never been published before
 177  */
 178 static int first_zone_iteration;
 179
 180 /**
 181  * The lookup timeout
 182  */
 183 static struct GNUNET_TIME_Relative default_lookup_timeout;
 184
 185 /**
 186  * #GNUNET_YES if ipv6 is supported
 187  */
 188 static int v6_enabled;
 189
 190 /**
 191  * #GNUNET_YES if ipv4 is supported
 192  */
 193 static int v4_enabled;
 194
 195 /**
 196  * Handle to the statistics service
 197  */
 198 static struct GNUNET_STATISTICS_Handle *statistics;
 199
 200
 201 /**
 202  * Task run during shutdown.
 203  *
 204  * @param cls unused
 205  * @param tc unused
 206  */
 207 static void
 208 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
 209 {
 210   struct ClientLookupHandle *clh;
 211
 212   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 213               "Shutting down!\n");
 214   GNUNET_SERVER_notification_context_destroy (nc);
 215   while (NULL != (clh = clh_head))
 216   {
 217     GNS_resolver_lookup_cancel (clh->lookup);
 218     GNUNET_CONTAINER_DLL_remove (clh_head, clh_tail, clh);
 219     GNUNET_free (clh);
 220   }
 221
 222   GNS_interceptor_done ();
 223   GNS_resolver_done ();
 224   if (NULL != statistics)
 225   {
 226     GNUNET_STATISTICS_destroy (statistics, GNUNET_NO);
 227     statistics = NULL;
 228   }
 229   if (GNUNET_SCHEDULER_NO_TASK != zone_publish_task)
 230   {
 231     GNUNET_SCHEDULER_cancel (zone_publish_task);
 232     zone_publish_task = GNUNET_SCHEDULER_NO_TASK;
 233   }
 234   if (NULL != namestore_iter)
 235   {
 236     GNUNET_NAMESTORE_zone_iteration_stop (namestore_iter);
 237     namestore_iter = NULL;
 238   }
 239   if (NULL != namestore_handle)
 240   {
 241     GNUNET_NAMESTORE_disconnect (namestore_handle);
 242     namestore_handle = NULL;
 243   }
 244   if (NULL != active_put)
 245   {
 246     GNUNET_DHT_put_cancel (active_put);
 247     active_put = NULL;
 248   }
 249   if (NULL != dht_handle)
 250   {
 251     GNUNET_DHT_disconnect (dht_handle);
 252     dht_handle = NULL;
 253   }
 254 }
 255
 256
 257 /**
 258  * Method called periodically that triggers iteration over authoritative records
 259  *
 260  * @param cls closure
 261  * @param tc task context
 262  */
 263 static void
 264 publish_zone_dht_next (void *cls,
 265                        const struct GNUNET_SCHEDULER_TaskContext *tc)
 266 {
 267   zone_publish_task = GNUNET_SCHEDULER_NO_TASK;
 268   GNUNET_NAMESTORE_zone_iterator_next (namestore_iter);
 269 }
 270
 271
 272 /**
 273  * Periodically iterate over our zone and store everything in dht
 274  *
 275  * @param cls NULL
 276  * @param tc task context
 277  */
 278 static void
 279 publish_zone_dht_start (void *cls,
 280                         const struct GNUNET_SCHEDULER_TaskContext *tc);
 281
 282
 283 /**
 284  * Continuation called from DHT once the PUT operation is done.
 285  *
 286  * @param cls closure, NULL
 287  * @param success #GNUNET_OK on success
 288  */
 289 static void
 290 dht_put_continuation (void *cls,
 291                       int success)
 292 {
 293   struct GNUNET_TIME_Relative next_put_interval;
 294
 295   num_public_records++;
 296   if ( (num_public_records > last_num_public_records) &&
 297        (GNUNET_NO == first_zone_iteration) )
 298   {
 299     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 300                 "Last record count was lower than current record count.  Reducing interval.\n");
 301     put_interval = GNUNET_TIME_relative_divide (zone_publish_time_window,
 302                                                 num_public_records);
 303     next_put_interval = GNUNET_TIME_relative_divide (put_interval,
 304                                                      LATE_ITERATION_SPEEDUP_FACTOR);
 305   }
 306   else
 307     next_put_interval = put_interval;
 308
 309   GNUNET_STATISTICS_set (statistics,
 310                          "Current zone iteration interval (ms)",
 311                          next_put_interval.rel_value_us / 1000LL,
 312                          GNUNET_NO);
 313   zone_publish_task = GNUNET_SCHEDULER_add_delayed (next_put_interval,
 314                                                     &publish_zone_dht_next,
 315                                                     NULL);
 316 }
 317
 318
 319 /**
 320  * Function used to put all records successively into the DHT.
 321  *
 322  * @param cls the closure (NULL)
 323  * @param key the private key of the authority (ours)
 324  * @param name the name of the records, NULL once the iteration is done
 325  * @param rd_count the number of records in @a rd
 326  * @param rd the record data
 327  */
 328 static void
 329 put_gns_record (void *cls,
 330                 const struct GNUNET_CRYPTO_EccPrivateKey *key,
 331                 const char *name,
 332                 unsigned int rd_count,
 333                 const struct GNUNET_NAMESTORE_RecordData *rd)
 334 {
 335   struct GNUNET_NAMESTORE_Block *block;
 336   struct GNUNET_HashCode query;
 337   struct GNUNET_TIME_Absolute expire;
 338   size_t block_size;
 339
 340   if (NULL == name)
 341   {
 342     /* we're done with one iteration, calculate when to do the next one */
 343     namestore_iter = NULL;
 344     last_num_public_records = num_public_records;
 345     first_zone_iteration = GNUNET_NO;
 346     if (0 == num_public_records)
 347     {
 348       /**
 349        * If no records are known (startup) or none present
 350        * we can safely set the interval to the value for a single
 351        * record
 352        */
 353       put_interval = zone_publish_time_window;
 354       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
 355                   "No records in namestore database.\n");
 356     }
 357     else
 358     {
 359       put_interval = GNUNET_TIME_relative_divide (zone_publish_time_window,
 360                                                   num_public_records);
 361     }
 362     put_interval = GNUNET_TIME_relative_max (MINIMUM_ZONE_ITERATION_INTERVAL,
 363                                              put_interval);
 364
 365     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 366                 "Zone iteration finished. Adjusted zone iteration interval to %s\n",
 367                 GNUNET_STRINGS_relative_time_to_string (put_interval, GNUNET_YES));
 368     GNUNET_STATISTICS_set (statistics,
 369                            "Current zone iteration interval (in ms)",
 370                            put_interval.rel_value_us / 1000LL,
 371                            GNUNET_NO);
 372     GNUNET_STATISTICS_update (statistics,
 373                               "Number of zone iterations",
 374                               1,
 375                               GNUNET_NO);
 376     GNUNET_STATISTICS_set (statistics,
 377                            "Number of public records in DHT",
 378                            last_num_public_records,
 379                            GNUNET_NO);
 380     if (0 == num_public_records)
 381       zone_publish_task = GNUNET_SCHEDULER_add_delayed (put_interval,
 382                                                         &publish_zone_dht_start,
 383                                                         NULL);
 384     else
 385       zone_publish_task = GNUNET_SCHEDULER_add_now (&publish_zone_dht_start,
 386                                                     NULL);
 387     return;
 388   }
 389
 390   /* FIXME: filter out records that are not public! */
 391
 392   /* We got a set of records to publish */
 393   if (0 == rd_count)
 394   {
 395     zone_publish_task = GNUNET_SCHEDULER_add_now (&publish_zone_dht_next,
 396                                                    NULL);
 397     return;
 398   }
 399   expire = GNUNET_NAMESTORE_record_get_expiration_time (rd_count,
 400                                                         rd);
 401   block = GNUNET_NAMESTORE_block_create (key,
 402                                          expire,
 403                                          name,
 404                                          rd,
 405                                          rd_count);
 406   block_size = ntohl (block->purpose.size)
 407     + sizeof (struct GNUNET_CRYPTO_EccSignature)
 408     + sizeof (struct GNUNET_CRYPTO_EccPublicKey);
 409   GNUNET_NAMESTORE_query_from_private_key (key,
 410                                            name,
 411                                            &query);
 412
 413   active_put = GNUNET_DHT_put (dht_handle, &query,
 414                                DHT_GNS_REPLICATION_LEVEL,
 415                                GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
 416                                GNUNET_BLOCK_TYPE_GNS_NAMERECORD,
 417                                block_size,
 418                                block,
 419                                expire,
 420                                DHT_OPERATION_TIMEOUT,
 421                                &dht_put_continuation,
 422                                NULL);
 423   if (NULL == active_put)
 424   {
 425     GNUNET_break (0);
 426     dht_put_continuation (NULL, GNUNET_NO);
 427   }
 428   GNUNET_free (block);
 429 }
 430
 431
 432 /**
 433  * Periodically iterate over our zone and store everything in dht
 434  *
 435  * @param cls NULL
 436  * @param tc task context
 437  */
 438 static void
 439 publish_zone_dht_start (void *cls,
 440                         const struct GNUNET_SCHEDULER_TaskContext *tc)
 441 {
 442   zone_publish_task = GNUNET_SCHEDULER_NO_TASK;
 443
 444   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 445               "Scheduling DHT zone update!\n");
 446   /* start counting again */
 447   num_public_records = 0;
 448   namestore_iter = GNUNET_NAMESTORE_zone_iteration_start (namestore_handle,
 449                                                           NULL, /* All zones */
 450                                                           &put_gns_record,
 451                                                           NULL);
 452 }
 453
 454
 455 /* END DHT ZONE PROPAGATION */
 456
 457
 458 /**
 459  * Reply to client with the result from our lookup.
 460  *
 461  * @param cls the closure (our client lookup handle)
 462  * @param rd_count the number of records
 463  * @param rd the record data
 464  */
 465 static void
 466 send_lookup_response (void* cls,
 467                       uint32_t rd_count,
 468                       const struct GNUNET_NAMESTORE_RecordData *rd)
 469 {
 470   struct ClientLookupHandle *clh = cls;
 471   struct GNUNET_GNS_ClientLookupResultMessage *rmsg;
 472   size_t len;
 473
 474   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 475               "Sending `%s' message with %d results\n",
 476               "LOOKUP_RESULT",
 477               rd_count);
 478
 479   len = GNUNET_NAMESTORE_records_get_size (rd_count, rd);
 480   rmsg = GNUNET_malloc (len + sizeof (struct GNUNET_GNS_ClientLookupResultMessage));
 481   rmsg->header.type = htons (GNUNET_MESSAGE_TYPE_GNS_LOOKUP_RESULT);
 482   rmsg->header.size = htons (len + sizeof(struct GNUNET_GNS_ClientLookupResultMessage));
 483   rmsg->id = clh->request_id;
 484   rmsg->rd_count = htonl (rd_count);
 485   GNUNET_NAMESTORE_records_serialize (rd_count, rd, len,
 486                                       (char*) &rmsg[1]);
 487   GNUNET_SERVER_notification_context_unicast (nc,
 488                                               clh->client,
 489                                               &rmsg->header,
 490                                               GNUNET_NO);
 491   GNUNET_free (rmsg);
 492   GNUNET_SERVER_receive_done (clh->client,
 493                               GNUNET_OK);
 494   GNUNET_CONTAINER_DLL_remove (clh_head, clh_tail, clh);
 495   GNUNET_free (clh);
 496   GNUNET_STATISTICS_update (statistics,
 497                             "Completed lookups", 1,
 498                             GNUNET_NO);
 499   GNUNET_STATISTICS_update (statistics,
 500                             "Records resolved",
 501                             rd_count,
 502                             GNUNET_NO);
 503 }
 504
 505
 506 /**
 507  * Handle lookup requests from client
 508  *
 509  * @param cls the closure
 510  * @param client the client
 511  * @param message the message
 512  */
 513 static void
 514 handle_lookup (void *cls,
 515                struct GNUNET_SERVER_Client *client,
 516                const struct GNUNET_MessageHeader *message)
 517 {
 518   char name[GNUNET_DNSPARSER_MAX_NAME_LENGTH + 1];
 519   struct ClientLookupHandle *clh;
 520   char *nameptr = name;
 521   const char *utf_in;
 522   const struct GNUNET_CRYPTO_EccPrivateKey *key;
 523   uint16_t msg_size;
 524   const struct GNUNET_GNS_ClientLookupMessage *sh_msg;
 525
 526   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 527               "Received `%s' message\n",
 528               "LOOKUP");
 529   msg_size = ntohs (message->size);
 530   if (msg_size < sizeof (struct GNUNET_GNS_ClientLookupMessage))
 531   {
 532     GNUNET_break (0);
 533     GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
 534     return;
 535   }
 536   sh_msg = (const struct GNUNET_GNS_ClientLookupMessage *) message;
 537   GNUNET_SERVER_notification_context_add (nc, client);
 538   if (GNUNET_YES == ntohl (sh_msg->have_key))
 539     key = &sh_msg->shorten_key;
 540   else
 541     key = NULL;
 542   utf_in = (const char *) &sh_msg[1];
 543   if ( ('\0' != utf_in[msg_size - sizeof (struct GNUNET_GNS_ClientLookupMessage) - 1]) ||
 544        (strlen (utf_in) > GNUNET_DNSPARSER_MAX_NAME_LENGTH) )
 545   {
 546     GNUNET_break (0);
 547     GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
 548     return;
 549   }
 550   GNUNET_STRINGS_utf8_tolower (utf_in, &nameptr);
 551
 552   clh = GNUNET_new (struct ClientLookupHandle);
 553   GNUNET_CONTAINER_DLL_insert (clh_head, clh_tail, clh);
 554   clh->client = client;
 555   clh->request_id = sh_msg->id;
 556   if ( (GNUNET_DNSPARSER_TYPE_A == ntohl (sh_msg->type)) &&
 557        (GNUNET_OK != v4_enabled) )
 558   {
 559     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 560                 "LOOKUP: Query for A record but AF_INET not supported!");
 561     send_lookup_response (clh, 0, NULL);
 562     return;
 563   }
 564   if ( (GNUNET_DNSPARSER_TYPE_AAAA == ntohl (sh_msg->type)) &&
 565        (GNUNET_OK != v6_enabled) )
 566   {
 567     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 568                 "LOOKUP: Query for AAAA record but AF_INET6 not supported!");
 569     send_lookup_response (clh, 0, NULL);
 570     return;
 571   }
 572   clh->lookup = GNS_resolver_lookup (&sh_msg->zone,
 573                                      ntohl (sh_msg->type),
 574                                      name,
 575                                      key,
 576                                      ntohl (sh_msg->only_cached),
 577                                      &send_lookup_response, clh);
 578   GNUNET_STATISTICS_update (statistics,
 579                             "Lookup attempts",
 580                             1, GNUNET_NO);
 581 }
 582
 583
 584 /**
 585  * Process GNS requests.
 586  *
 587  * @param cls closure
 588  * @param server the initialized server
 589  * @param c configuration to use
 590  */
 591 static void
 592 run (void *cls, struct GNUNET_SERVER_Handle *server,
 593      const struct GNUNET_CONFIGURATION_Handle *c)
 594 {
 595   static const struct GNUNET_SERVER_MessageHandler handlers[] = {
 596     { &handle_lookup, NULL, GNUNET_MESSAGE_TYPE_GNS_LOOKUP, 0},
 597     {NULL, NULL, 0, 0}
 598   };
 599   struct GNUNET_CRYPTO_EccPublicKey dns_root;
 600   unsigned long long max_parallel_bg_queries = 0;
 601   char *dns_root_name;
 602
 603   v6_enabled = GNUNET_NETWORK_test_pf (PF_INET6);
 604   v4_enabled = GNUNET_NETWORK_test_pf (PF_INET);
 605
 606   namestore_handle = GNUNET_NAMESTORE_connect (c);
 607   if (NULL == namestore_handle)
 608   {
 609     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 610                 _("Failed to connect to the namestore!\n"));
 611     GNUNET_SCHEDULER_shutdown ();
 612     return;
 613   }
 614
 615   put_interval = INITIAL_PUT_INTERVAL;
 616   zone_publish_time_window = DEFAULT_ZONE_PUBLISH_TIME_WINDOW;
 617
 618   if (GNUNET_OK ==
 619       GNUNET_CONFIGURATION_get_value_time (c, "gns",
 620                                            "ZONE_PUBLISH_TIME_WINDOW",
 621                                            &zone_publish_time_window))
 622   {
 623     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 624                 "Time window for zone iteration: %s\n",
 625                 GNUNET_STRINGS_relative_time_to_string (zone_publish_time_window, GNUNET_YES));
 626   }
 627   if (GNUNET_OK ==
 628       GNUNET_CONFIGURATION_get_value_number (c, "gns",
 629                                             "MAX_PARALLEL_BACKGROUND_QUERIES",
 630                                             &max_parallel_bg_queries))
 631   {
 632     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 633                 "Number of allowed parallel background queries: %llu\n",
 634                 max_parallel_bg_queries);
 635   }
 636
 637   if (GNUNET_OK ==
 638       GNUNET_CONFIGURATION_get_value_time (c, "gns",
 639                                            "DEFAULT_LOOKUP_TIMEOUT",
 640                                            &default_lookup_timeout))
 641   {
 642     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 643                 "Default lookup timeout: %s\n",
 644                 GNUNET_STRINGS_relative_time_to_string (default_lookup_timeout,
 645                                                         GNUNET_YES));
 646   }
 647
 648   dht_handle = GNUNET_DHT_connect (c,
 649                                    (unsigned int) max_parallel_bg_queries);
 650   if (NULL == dht_handle)
 651   {
 652     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 653                 _("Could not connect to DHT!\n"));
 654     GNUNET_SCHEDULER_add_now (&shutdown_task, NULL);
 655     return;
 656   }
 657
 658   if (GNUNET_OK ==
 659       GNUNET_CONFIGURATION_get_value_string (c, "gns", "DNS_ROOT",
 660                                              &dns_root_name))
 661   {
 662     if (GNUNET_OK !=
 663         GNUNET_CRYPTO_ecc_public_key_from_string (dns_root_name,
 664                                                   strlen (dns_root_name),
 665                                                   &dns_root))
 666     {
 667       GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
 668                                  "gns", "DNS_ROOT",
 669                                  _("valid public key required"));
 670       GNUNET_SCHEDULER_add_now (&shutdown_task, NULL);
 671       GNUNET_free (dns_root_name);
 672       return;
 673     }
 674     GNUNET_log (GNUNET_ERROR_TYPE_INFO,
 675                 "DNS hijacking with root `%s' enabled. Connecting to DNS service.\n",
 676                 dns_root_name);
 677     GNUNET_free (dns_root_name);
 678     if (GNUNET_SYSERR ==
 679         GNS_interceptor_init (&dns_root, c))
 680     {
 681       GNUNET_SCHEDULER_add_now (&shutdown_task, NULL);
 682       return;
 683     }
 684   }
 685   /* FIXME: install client disconnect handle to clean up pending
 686      lookups on client disconnect! */
 687   GNS_resolver_init (namestore_handle, dht_handle,
 688                      c,
 689                      max_parallel_bg_queries);
 690
 691   /* Schedule periodic put for our records. */
 692   first_zone_iteration = GNUNET_YES;
 693   GNUNET_SERVER_add_handlers (server, handlers);
 694   statistics = GNUNET_STATISTICS_create ("gns", c);
 695   nc = GNUNET_SERVER_notification_context_create (server, 1);
 696   zone_publish_task = GNUNET_SCHEDULER_add_now (&publish_zone_dht_start,
 697                                                 NULL);
 698   GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
 699                                 &shutdown_task, NULL);
 700 }
 701
 702
 703 /**
 704  * The main function for the GNS service.
 705  *
 706  * @param argc number of arguments from the command line
 707  * @param argv command line arguments
 708  * @return 0 ok, 1 on error
 709  */
 710 int
 711 main (int argc, char *const *argv)
 712 {
 713   int ret;
 714
 715   ret =
 716       (GNUNET_OK ==
 717        GNUNET_SERVICE_run (argc, argv, "gns", GNUNET_SERVICE_OPTION_NONE, &run,
 718                            NULL)) ? 0 : 1;
 719   return ret;
 720 }
 721
 722 /* end of gnunet-service-gns.c */