src/gns/gnunet-service-gns.c

   1 /*
   2      This file is part of GNUnet.
   3      (C) 2009, 2010, 2011 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 /**
  22  *
  23  * TODO:
  24  *    - Write xquery and block plugin
  25  *    - The smaller FIXME issues all around
  26  *
  27  * @file gns/gnunet-service-gns.c
  28  * @brief GNUnet GNS service
  29  * @author Martin Schanzenbach
  30  */
  31 #include "platform.h"
  32 #include "gnunet_util_lib.h"
  33 #include "gnunet_transport_service.h"
  34 #include "gnunet_dns_service.h"
  35 #include "gnunet_dnsparser_lib.h"
  36 #include "gnunet_dht_service.h"
  37 #include "gnunet_namestore_service.h"
  38 #include "gnunet_gns_service.h"
  39 #include "block_gns.h"
  40 #include "gns.h"
  41
  42 #define DHT_OPERATION_TIMEOUT  GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
  43 #define DHT_LOOKUP_TIMEOUT DHT_OPERATION_TIMEOUT
  44 #define DHT_GNS_REPLICATION_LEVEL 5
  45
  46 /* Ignore for now not used anyway and probably never will */
  47 #define GNUNET_MESSAGE_TYPE_GNS_CLIENT_LOOKUP 23
  48 #define GNUNET_MESSAGE_TYPE_GNS_CLIENT_RESULT 24
  49
  50 /**
  51  * Handle to a currenty pending resolution
  52  */
  53 struct GNUNET_GNS_ResolverHandle
  54 {
  55   /* The name to resolve */
  56   char *name;
  57
  58   /* the request handle to reply to */
  59   struct GNUNET_DNS_RequestHandle *request_handle;
  60
  61   /* the dns parser packet received */
  62   struct GNUNET_DNSPARSER_Packet *packet;
  63
  64   /* the query parsed from the packet */
  65
  66   struct GNUNET_DNSPARSER_Query *query;
  67
  68   /* has this query been answered? how many matches */
  69   int answered;
  70
  71   /* the authoritative zone to query */
  72   GNUNET_HashCode authority;
  73
  74   /* the name of the authoritative zone to query */
  75   char *authority_name;
  76
  77   /**
  78    * we have an authority in namestore that
  79    * may be able to resolve
  80    */
  81   int authority_found;
  82
  83   /* a handle for dht lookups. should be NULL if no lookups are in progress */
  84   struct GNUNET_DHT_GetHandle *get_handle;
  85
  86   /* timeout task for dht lookups */
  87   GNUNET_SCHEDULER_TaskIdentifier dht_timeout_task;
  88
  89 };
  90
  91
  92 /**
  93  * Our handle to the DNS handler library
  94  */
  95 struct GNUNET_DNS_Handle *dns_handle;
  96
  97 /**
  98  * Our handle to the DHT
  99  */
 100 struct GNUNET_DHT_Handle *dht_handle;
 101
 102 /**
 103  * Our zone's private key
 104  */
 105 struct GNUNET_CRYPTO_RsaPrivateKey *zone_key;
 106
 107 /**
 108  * Our handle to the namestore service
 109  * FIXME maybe need a second handle for iteration
 110  */
 111 struct GNUNET_NAMESTORE_Handle *namestore_handle;
 112
 113 /**
 114  * Handle to iterate over our authoritative zone in namestore
 115  */
 116 struct GNUNET_NAMESTORE_ZoneIterator *namestore_iter;
 117
 118 /**
 119  * The configuration the GNS service is running with
 120  */
 121 const struct GNUNET_CONFIGURATION_Handle *GNS_cfg;
 122
 123 /**
 124  * Our notification context.
 125  */
 126 static struct GNUNET_SERVER_NotificationContext *nc;
 127
 128 /**
 129  * Our zone hash
 130  */
 131 GNUNET_HashCode zone_hash;
 132
 133 /**
 134  * Our tld. Maybe get from config file
 135  */
 136 const char* gnunet_tld = ".gnunet";
 137
 138 /**
 139  * Useful for zone update for DHT put
 140  */
 141 static int num_public_records =  3600;
 142 struct GNUNET_TIME_Relative dht_update_interval;
 143 GNUNET_SCHEDULER_TaskIdentifier zone_update_taskid = GNUNET_SCHEDULER_NO_TASK;
 144
 145 /* Prototypes */
 146 static void reply_to_dns(struct GNUNET_GNS_ResolverHandle *answer,
 147                          uint32_t rd_count,
 148                          const struct GNUNET_NAMESTORE_RecordData *rd);
 149 static void resolve_name(struct GNUNET_GNS_ResolverHandle *rh);
 150
 151 /**
 152  * Task run during shutdown.
 153  *
 154  * @param cls unused
 155  * @param tc unused
 156  */
 157 static void
 158 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
 159 {
 160   /* Kill zone task for it may make the scheduler hang */
 161   if (zone_update_taskid)
 162     GNUNET_SCHEDULER_cancel(zone_update_taskid);
 163
 164   GNUNET_DNS_disconnect(dns_handle);
 165   GNUNET_NAMESTORE_disconnect(namestore_handle, 1);
 166   GNUNET_DHT_disconnect(dht_handle);
 167 }
 168
 169 /**
 170  * Callback when record data is put into namestore
 171  *
 172  * @param cls the closure
 173  * @param success GNUNET_OK on success
 174  * @param emsg the error message. NULL if SUCCESS==GNUNET_OK
 175  */
 176 void
 177 on_namestore_record_put_result(void *cls,
 178                                int32_t success,
 179                                const char *emsg)
 180 {
 181   if (GNUNET_NO == success)
 182   {
 183     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "records already in namestore\n");
 184     return;
 185   }
 186   else if (GNUNET_YES == success)
 187   {
 188     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 189                "records successfully put in namestore\n");
 190     return;
 191   }
 192
 193   GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
 194              "Error putting records into namestore: %s\n", emsg);
 195 }
 196
 197 /**
 198  * Handle timeout for DHT requests
 199  *
 200  * @param cls the request handle as closure
 201  * @param tc the task context
 202  */
 203 static void
 204 dht_lookup_timeout(void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
 205 {
 206   struct GNUNET_GNS_ResolverHandle *rh = cls;
 207
 208   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 209              "dht lookup for query %s (type=%d) timed out.\n",
 210              rh->name, rh->query->type);
 211
 212   GNUNET_DHT_get_stop (rh->get_handle);
 213   reply_to_dns(rh, 0, NULL);
 214 }
 215
 216 /**
 217  * Function called when we get a result from the dht
 218  * for our query
 219  *
 220  * @param cls the request handle
 221  * @param exp lifetime
 222  * @param key the key the record was stored under
 223  * @param get_path get path
 224  * @param get_path_length get path length
 225  * @param put_path put path
 226  * @param put_path_length put path length
 227  * @param type the block type
 228  * @param size the size of the record
 229  * @param data the record data
 230  */
 231 static void
 232 process_authority_dht_result(void* cls,
 233                  struct GNUNET_TIME_Absolute exp,
 234                  const GNUNET_HashCode * key,
 235                  const struct GNUNET_PeerIdentity *get_path,
 236                  unsigned int get_path_length,
 237                  const struct GNUNET_PeerIdentity *put_path,
 238                  unsigned int put_path_length,
 239                  enum GNUNET_BLOCK_Type type,
 240                  size_t size, const void *data)
 241 {
 242   struct GNUNET_GNS_ResolverHandle *rh;
 243   struct GNSNameRecordBlock *nrb;
 244   uint32_t num_records;
 245   char* name = NULL;
 246   char* rd_data = (char*) data;
 247   int i;
 248   int rd_size;
 249   GNUNET_HashCode zone, name_hash;
 250
 251   if (data == NULL)
 252     return;
 253
 254   //FIXME check expiration?
 255
 256   rh = (struct GNUNET_GNS_ResolverHandle *)cls;
 257   nrb = (struct GNSNameRecordBlock*)data;
 258
 259   /* stop dht lookup and timeout task */
 260   GNUNET_DHT_get_stop (rh->get_handle);
 261   GNUNET_SCHEDULER_cancel(rh->dht_timeout_task);
 262
 263   rh->get_handle = NULL;
 264   num_records = ntohl(nrb->rd_count);
 265   name = (char*)&nrb[1];
 266   {
 267     struct GNUNET_NAMESTORE_RecordData rd[num_records];
 268
 269     rd_data += strlen(name) + sizeof(struct GNSNameRecordBlock);
 270     rd_size = size - strlen(name) - sizeof(struct GNSNameRecordBlock);
 271
 272     if (GNUNET_SYSERR == GNUNET_NAMESTORE_records_deserialize (rd_size,
 273                                                                rd_data,
 274                                                                num_records,
 275                                                                rd))
 276     {
 277       GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Error deserializing data!\n");
 278       return;
 279     }
 280
 281     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 282                "Got name: %s (wanted %s)\n", name, rh->authority_name);
 283     for (i=0; i<num_records; i++)
 284     {
 285
 286       GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 287                 "Got name: %s (wanted %s)\n", name, rh->authority_name);
 288       GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 289                  "Got type: %d (wanted %d)\n",
 290                  rd[i].record_type, GNUNET_GNS_RECORD_PKEY);
 291       GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 292                  "Got data length: %d\n", rd[i].data_size);
 293       GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 294                  "Got flag %d\n", rd[i].flags);
 295
 296       if ((strcmp(name, rh->authority_name) == 0) &&
 297           (rd[i].record_type == GNUNET_GNS_RECORD_PKEY))
 298       {
 299         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Authority found in DHT\n");
 300         rh->answered = 1;
 301         GNUNET_CRYPTO_hash(
 302                    (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *)rd[i].data,
 303                    rd[i].data_size,
 304                    &rh->authority);
 305       }
 306
 307     }
 308
 309
 310     GNUNET_CRYPTO_hash(name, strlen(name), &name_hash);
 311     GNUNET_CRYPTO_hash_xor(key, &name_hash, &zone);
 312
 313     /* Save to namestore */
 314     if (0 == GNUNET_CRYPTO_hash_cmp(&zone_hash, &zone))
 315     {
 316       GNUNET_NAMESTORE_record_put (namestore_handle,
 317                                  &nrb->public_key,
 318                                  name,
 319                                  exp,
 320                                  num_records,
 321                                  rd,
 322                                  &nrb->signature,
 323                                  &on_namestore_record_put_result, //cont
 324                                  NULL); //cls
 325     }
 326   }
 327
 328   if (rh->answered)
 329   {
 330     rh->answered = 0;
 331     resolve_name(rh);
 332     return;
 333   }
 334   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "No authority in records\n");
 335   reply_to_dns(rh, 0, NULL);
 336 }
 337
 338 /**
 339  * Start DHT lookup for a name -> PKEY (compare NS) record in
 340  * query->authority's zone
 341  *
 342  * @param rh the pending gns query
 343  * @param name the name of the PKEY record
 344  */
 345 static void
 346 resolve_authority_dht(struct GNUNET_GNS_ResolverHandle *rh)
 347 {
 348   uint32_t xquery;
 349   GNUNET_HashCode name_hash;
 350   GNUNET_HashCode lookup_key;
 351
 352   GNUNET_CRYPTO_hash(rh->authority_name,
 353                      strlen(rh->authority_name),
 354                      &name_hash);
 355   GNUNET_CRYPTO_hash_xor(&name_hash, &rh->authority, &lookup_key);
 356
 357   rh->dht_timeout_task = GNUNET_SCHEDULER_add_delayed (DHT_LOOKUP_TIMEOUT,
 358                                                        &dht_lookup_timeout, rh);
 359
 360   xquery = htonl(GNUNET_GNS_RECORD_PKEY);
 361   //FIXME how long to wait for results?
 362   rh->get_handle = GNUNET_DHT_get_start(dht_handle,
 363                        DHT_OPERATION_TIMEOUT,
 364                        GNUNET_BLOCK_TYPE_GNS_NAMERECORD,
 365                        &lookup_key,
 366                        DHT_GNS_REPLICATION_LEVEL,
 367                        GNUNET_DHT_RO_NONE,
 368                        &xquery,
 369                        sizeof(xquery),
 370                        &process_authority_dht_result,
 371                        rh);
 372
 373 }
 374
 375 /**
 376  * Function called when we get a result from the dht
 377  * for our query
 378  *
 379  * @param cls the request handle
 380  * @param exp lifetime
 381  * @param key the key the record was stored under
 382  * @param get_path get path
 383  * @param get_path_length get path length
 384  * @param put_path put path
 385  * @param put_path_length put path length
 386  * @param type the block type
 387  * @param size the size of the record
 388  * @param data the record data
 389  */
 390 static void
 391 process_name_dht_result(void* cls,
 392                  struct GNUNET_TIME_Absolute exp,
 393                  const GNUNET_HashCode * key,
 394                  const struct GNUNET_PeerIdentity *get_path,
 395                  unsigned int get_path_length,
 396                  const struct GNUNET_PeerIdentity *put_path,
 397                  unsigned int put_path_length,
 398                  enum GNUNET_BLOCK_Type type,
 399                  size_t size, const void *data)
 400 {
 401   struct GNUNET_GNS_ResolverHandle *rh;
 402   struct GNSNameRecordBlock *nrb;
 403   uint32_t num_records;
 404   char* name = NULL;
 405   char* rd_data = (char*)data;
 406   int i;
 407   int rd_size;
 408
 409   GNUNET_HashCode zone, name_hash;
 410   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "got dht result (size=%d)\n", size);
 411
 412   if (data == NULL)
 413     return;
 414
 415   //FIXME maybe check expiration here, check block type
 416
 417   rh = (struct GNUNET_GNS_ResolverHandle *)cls;
 418   nrb = (struct GNSNameRecordBlock*)data;
 419
 420   /* stop lookup and timeout task */
 421   GNUNET_DHT_get_stop (rh->get_handle);
 422   GNUNET_SCHEDULER_cancel(rh->dht_timeout_task);
 423
 424   rh->get_handle = NULL;
 425   name = (char*)&nrb[1];
 426   num_records = ntohl(nrb->rd_count);
 427   {
 428     struct GNUNET_NAMESTORE_RecordData rd[num_records];
 429
 430     rd_data += strlen(name) + sizeof(struct GNSNameRecordBlock);
 431     rd_size = size - strlen(name) - sizeof(struct GNSNameRecordBlock);
 432
 433     if (GNUNET_SYSERR == GNUNET_NAMESTORE_records_deserialize (rd_size,
 434                                                                rd_data,
 435                                                                num_records,
 436                                                                rd))
 437     {
 438       GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Error deserializing data!\n");
 439       return;
 440     }
 441
 442     for (i=0; i<num_records; i++)
 443     {
 444       GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 445                "Got name: %s (wanted %s)\n", name, rh->name);
 446       GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 447                "Got type: %d (wanted %d)\n",
 448                rd[i].record_type, rh->query->type);
 449       GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 450                "Got data length: %d\n", rd[i].data_size);
 451       GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 452                "Got flag %d\n", rd[i].flags);
 453
 454      if ((strcmp(name, rh->name) == 0) &&
 455          (rd[i].record_type == rh->query->type))
 456       {
 457         rh->answered++;
 458       }
 459
 460     }
 461
 462     GNUNET_CRYPTO_hash(name, strlen(name), &name_hash);
 463     GNUNET_CRYPTO_hash_xor(key, &name_hash, &zone);
 464
 465     /**
 466      * FIXME check pubkey against existing key in namestore?
 467      * https://gnunet.org/bugs/view.php?id=2179
 468      */
 469
 470     /* Save to namestore */
 471     GNUNET_NAMESTORE_record_put (namestore_handle,
 472                                  &nrb->public_key,
 473                                  name,
 474                                  exp,
 475                                  num_records,
 476                                  rd,
 477                                  &nrb->signature,
 478                                  &on_namestore_record_put_result, //cont
 479                                  NULL); //cls
 480
 481     if (rh->answered)
 482       reply_to_dns(rh, num_records, rd);
 483     else
 484       reply_to_dns(rh, 0, NULL);
 485   }
 486
 487 }
 488
 489
 490
 491
 492 /**
 493  * Start DHT lookup for a (name -> query->record_type) record in
 494  * query->authority's zone
 495  *
 496  * @param rh the pending gns query context
 497  * @param name the name to query record
 498  */
 499 static void
 500 resolve_name_dht(struct GNUNET_GNS_ResolverHandle *rh, const char* name)
 501 {
 502   uint32_t xquery;
 503   GNUNET_HashCode name_hash;
 504   GNUNET_HashCode lookup_key;
 505   struct GNUNET_CRYPTO_HashAsciiEncoded lookup_key_string;
 506
 507   GNUNET_CRYPTO_hash(name, strlen(name), &name_hash);
 508   GNUNET_CRYPTO_hash_xor(&name_hash, &rh->authority, &lookup_key);
 509   GNUNET_CRYPTO_hash_to_enc (&lookup_key, &lookup_key_string);
 510
 511   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 512              "starting dht lookup for %s with key: %s\n",
 513              name, (char*)&lookup_key_string);
 514
 515   rh->dht_timeout_task = GNUNET_SCHEDULER_add_delayed(DHT_LOOKUP_TIMEOUT,
 516                                                       &dht_lookup_timeout, rh);
 517
 518   xquery = htonl(rh->query->type);
 519   //FIXME how long to wait for results?
 520   rh->get_handle = GNUNET_DHT_get_start(dht_handle,
 521                        DHT_OPERATION_TIMEOUT,
 522                        GNUNET_BLOCK_TYPE_GNS_NAMERECORD,
 523                        &lookup_key,
 524                        DHT_GNS_REPLICATION_LEVEL,
 525                        GNUNET_DHT_RO_NONE,
 526                        &xquery,
 527                        sizeof(xquery),
 528                        &process_name_dht_result,
 529                        rh);
 530
 531 }
 532
 533 //Prototype
 534 static void
 535 resolve_name(struct GNUNET_GNS_ResolverHandle *rh);
 536
 537 /**
 538  * This is a callback function that should give us only PKEY
 539  * records. Used to query the namestore for the authority (PKEY)
 540  * for 'name'
 541  *
 542  * @param cls the pending query
 543  * @param key the key of the zone we did the lookup
 544  * @param expiration expiration date of the record data set in the namestore
 545  * @param name the name for which we need an authority
 546  * @param rd_count the number of records with 'name'
 547  * @param rd the record data
 548  * @param signature the signature of the authority for the record data
 549  */
 550 static void
 551 process_authority_lookup(void* cls,
 552                    const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *key,
 553                    struct GNUNET_TIME_Absolute expiration,
 554                    const char *name,
 555                    unsigned int rd_count,
 556                    const struct GNUNET_NAMESTORE_RecordData *rd,
 557                    const struct GNUNET_CRYPTO_RsaSignature *signature)
 558 {
 559   struct GNUNET_GNS_ResolverHandle *rh;
 560   struct GNUNET_TIME_Relative remaining_time;
 561   GNUNET_HashCode zone;
 562
 563   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Got %d records from authority lookup\n",
 564              rd_count);
 565
 566   rh = (struct GNUNET_GNS_ResolverHandle *)cls;
 567   GNUNET_CRYPTO_hash(key,
 568                      sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
 569                      &zone);
 570   remaining_time = GNUNET_TIME_absolute_get_remaining (expiration);
 571
 572   /**
 573    * No authority found in namestore.
 574    */
 575   if (rd_count == 0)
 576   {
 577     /**
 578      * We did not find an authority in the namestore
 579      * _IF_ the current authoritative zone is us we cannot resolve
 580      * _ELSE_ we can still check the _expired_ dht
 581      */
 582     if ((0 != GNUNET_CRYPTO_hash_cmp(&rh->authority, &zone_hash)) &&
 583         (remaining_time.rel_value == 0))
 584     {
 585       GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 586                  "Authority %s unknown in namestore, trying dht\n",
 587                  rh->authority_name);
 588       resolve_authority_dht(rh);
 589       return;
 590     }
 591     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Authority %s unknown\n",
 592                rh->authority_name);
 593     reply_to_dns(rh, 0, NULL);
 594     return;
 595   }
 596
 597   //Note only 1 pkey should have been returned.. anything else would be strange
 598   /**
 599    * We found an authority that may be able to help us
 600    * move on with query
 601    */
 602   int i;
 603   for (i=0; i<rd_count;i++)
 604   {
 605
 606     if (rd[i].record_type != GNUNET_GNS_RECORD_PKEY)
 607       continue;
 608
 609       if ((GNUNET_TIME_absolute_get_remaining (rd[i].expiration)).rel_value
 610           == 0)
 611       {
 612         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "This pkey is expired.\n");
 613         if (remaining_time.rel_value == 0)
 614         {
 615           GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 616                      "This dht entry is expired. Refreshing\n");
 617           resolve_authority_dht(rh);
 618         }
 619
 620         continue;
 621       }
 622
 623       /**
 624        * Resolve rest of query with new authority
 625        */
 626       GNUNET_assert(rd[i].record_type == GNUNET_GNS_RECORD_PKEY);
 627       GNUNET_CRYPTO_hash(rd[i].data,
 628                          sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
 629                          &rh->authority);
 630       resolve_name(rh);
 631       return;
 632
 633   }
 634
 635   /**
 636    * no answers found
 637    */
 638   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 639              "Authority lookup successful but no PKEY... never get here\n");
 640   reply_to_dns(rh, 0, NULL);
 641 }
 642
 643
 644 /**
 645  * Reply to client with the result from our lookup.
 646  *
 647  * @param rh the request handle of the lookup
 648  * @param rd_count the number of records to return
 649  * @param rd the record data
 650  */
 651 static void
 652 reply_to_dns(struct GNUNET_GNS_ResolverHandle *rh, uint32_t rd_count,
 653              const struct GNUNET_NAMESTORE_RecordData *rd)
 654 {
 655   int i;
 656   size_t len;
 657   int ret;
 658   char *buf;
 659   struct GNUNET_DNSPARSER_Packet *packet = rh->packet;
 660   struct GNUNET_DNSPARSER_Record answer_records[rh->answered];
 661   struct GNUNET_DNSPARSER_Record additional_records[rd_count-(rh->answered)];
 662   packet->answers = answer_records;
 663   packet->additional_records = additional_records;
 664
 665   /**
 666    * Put records in the DNS packet and modify it
 667    * to a response
 668    */
 669   len = sizeof(struct GNUNET_DNSPARSER_Record*);
 670   for (i=0; i < rd_count; i++)
 671   {
 672
 673     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 674                "Adding type %d to DNS response\n", rd[i].record_type);
 675     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Name: %s\n", rh->name);
 676     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "QName: %s\n", rh->query->name);
 677     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Record %d/%d\n", i+1, rd_count);
 678     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Record len %d\n", rd[i].data_size);
 679
 680     if (rd[i].record_type == rh->query->type)
 681     {
 682       answer_records[i].name = rh->query->name;
 683       answer_records[i].type = rd[i].record_type;
 684       answer_records[i].data.raw.data_len = rd[i].data_size;
 685       answer_records[i].data.raw.data = (char*)rd[i].data;
 686       answer_records[i].expiration_time = rd[i].expiration;
 687       answer_records[i].class = GNUNET_DNSPARSER_CLASS_INTERNET;//hmmn
 688     }
 689     else
 690     {
 691       additional_records[i].name = rh->query->name;
 692       additional_records[i].type = rd[i].record_type;
 693       additional_records[i].data.raw.data_len = rd[i].data_size;
 694       additional_records[i].data.raw.data = (char*)rd[i].data;
 695       additional_records[i].expiration_time = rd[i].expiration;
 696       additional_records[i].class = GNUNET_DNSPARSER_CLASS_INTERNET;//hmmn
 697     }
 698   }
 699
 700   packet->num_answers = rh->answered;
 701   packet->num_additional_records = rd_count-(rh->answered);
 702
 703   if (0 == GNUNET_CRYPTO_hash_cmp(&rh->authority, &zone_hash))
 704     packet->flags.authoritative_answer = 1;
 705   else
 706     packet->flags.authoritative_answer = 0;
 707
 708   if (rd == NULL)
 709     packet->flags.return_code = GNUNET_DNSPARSER_RETURN_CODE_NAME_ERROR;
 710   else
 711     packet->flags.return_code = GNUNET_DNSPARSER_RETURN_CODE_NO_ERROR;
 712
 713   packet->flags.query_or_response = 1;
 714
 715
 716   /**
 717    * Reply to DNS
 718    */
 719   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 720              "Building DNS response\n");
 721   ret = GNUNET_DNSPARSER_pack (packet,
 722                                1024, /* FIXME magic from dns redirector */
 723                                &buf,
 724                                &len);
 725   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 726              "Built DNS response! (ret=%d,len=%d)\n", ret, len);
 727   if (ret == GNUNET_OK)
 728   {
 729     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 730                "Answering DNS request\n");
 731     GNUNET_DNS_request_answer(rh->request_handle,
 732                               len,
 733                               buf);
 734     //GNUNET_free(answer);
 735     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Answered DNS request\n");
 736   }
 737   else
 738   {
 739     GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
 740                "Error building DNS response! (ret=%d)", ret);
 741   }
 742
 743   GNUNET_free(rh->name);
 744   GNUNET_free(rh);
 745 }
 746
 747
 748 /**
 749  * Namestore calls this function if we have record for this name.
 750  * (or with rd_count=0 to indicate no matches)
 751  *
 752  * @param cls the pending query
 753  * @param key the key of the zone we did the lookup
 754  * @param expiration expiration date of the namestore entry
 755  * @param name the name for which we need an authority
 756  * @param rd_count the number of records with 'name'
 757  * @param rd the record data
 758  * @param signature the signature of the authority for the record data
 759  */
 760 static void
 761 process_authoritative_result(void* cls,
 762                   const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *key,
 763                   struct GNUNET_TIME_Absolute expiration,
 764                   const char *name, unsigned int rd_count,
 765                   const struct GNUNET_NAMESTORE_RecordData *rd,
 766                   const struct GNUNET_CRYPTO_RsaSignature *signature)
 767 {
 768   struct GNUNET_GNS_ResolverHandle *rh;
 769   struct GNUNET_TIME_Relative remaining_time;
 770   GNUNET_HashCode zone;
 771
 772   rh = (struct GNUNET_GNS_ResolverHandle *) cls;
 773   GNUNET_CRYPTO_hash(key,
 774                      sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
 775                      &zone);
 776   remaining_time = GNUNET_TIME_absolute_get_remaining (expiration);
 777
 778   if (rd_count == 0)
 779   {
 780     /**
 781      * Lookup terminated and no results
 782      * -> DHT Phase unless data is recent
 783      */
 784     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 785                "Namestore lookup for %s terminated without results\n", name);
 786
 787     /**
 788      * if this is not our zone we cannot rely on the namestore to be
 789      * complete. -> Query DHT
 790      */
 791     if (GNUNET_CRYPTO_hash_cmp(&zone, &zone_hash))
 792     {
 793       if (remaining_time.rel_value == 0)
 794       {
 795         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 796                    "trying dht...\n");
 797         resolve_name_dht(rh, name);
 798         return;
 799       }
 800       else
 801       {
 802         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 803                    "Record is still recent. No DHT lookup\n");
 804       }
 805     }
 806
 807     /**
 808      * Our zone and no result? Cannot resolve TT
 809      */
 810     GNUNET_assert(rh->answered == 0);
 811     reply_to_dns(rh, 0, NULL);
 812     return;
 813
 814   }
 815   else
 816   {
 817
 818     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 819                "Processing additional result %s from namestore\n", name);
 820     int i;
 821     for (i=0; i<rd_count;i++)
 822     {
 823
 824       if ((strcmp(name, rh->query->name) == 0)
 825           && (rd[i].record_type != rh->query->type))
 826         continue;
 827
 828       if ((GNUNET_TIME_absolute_get_remaining (rd[i].expiration)).rel_value
 829           == 0)
 830       {
 831         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "This record is expired. Skipping\n");
 832         continue;
 833       }
 834
 835       rh->answered++;
 836
 837     }
 838
 839     /**
 840      * no answers found
 841      * consult dht if expired
 842      */
 843     if ((remaining_time.rel_value == 0) && (rh->answered == 0))
 844     {
 845       GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 846                  "This dht entry is old. Refreshing.\n");
 847       resolve_name_dht(rh, name);
 848       return;
 849     }
 850
 851     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Found %d answer(s) to query!\n",
 852                rh->answered);
 853
 854     reply_to_dns(rh, rd_count, rd);
 855   }
 856 }
 857
 858 /**
 859  * Determine if this name is canonical.
 860  * i.e.
 861  * a.b.gnunet  = not canonical
 862  * a           = canonical
 863  *
 864  * @param name the name to test
 865  * @return 1 if canonical
 866  */
 867 static int
 868 is_canonical(char* name)
 869 {
 870   uint32_t len = strlen(name);
 871   int i;
 872
 873   for (i=0; i<len; i++)
 874   {
 875     if (*(name+i) == '.')
 876       return 0;
 877   }
 878   return 1;
 879 }
 880
 881 /**
 882  * Move one level up in the domain hierarchy and return the
 883  * passed top level domain.
 884  *
 885  * @param name the domain
 886  * @return the tld
 887  */
 888 static char*
 889 pop_tld(char* name)
 890 {
 891   uint32_t len;
 892
 893   if (is_canonical(name))
 894     return NULL;
 895
 896   for (len = strlen(name); len > 0; len--)
 897   {
 898     if (*(name+len) == '.')
 899       break;
 900   }
 901
 902   if (len == 0)
 903     return NULL;
 904
 905   name[len] = '\0';
 906
 907   return (name+len+1);
 908 }
 909
 910
 911 /**
 912  * The first phase of resolution.
 913  * First check if the name is canonical.
 914  * If it is then try to resolve directly.
 915  * If not then we first have to resolve the authoritative entities.
 916  *
 917  * @param rh the pending lookup
 918  */
 919 static void
 920 resolve_name(struct GNUNET_GNS_ResolverHandle *rh)
 921 {
 922   if (is_canonical(rh->name))
 923   {
 924     /* We only need to check the current zone's ns */
 925     GNUNET_NAMESTORE_lookup_record(namestore_handle,
 926                                &rh->authority,
 927                                rh->name,
 928                                rh->query->type,
 929                                &process_authoritative_result,
 930                                rh);
 931   }
 932   else
 933   {
 934     /* We have to resolve the authoritative entity first */
 935     rh->authority_name = pop_tld(rh->name);
 936     GNUNET_NAMESTORE_lookup_record(namestore_handle,
 937                                  &rh->authority,
 938                                  rh->authority_name,
 939                                  GNUNET_GNS_RECORD_PKEY,
 940                                  &process_authority_lookup,
 941                                  rh);
 942   }
 943 }
 944
 945 /**
 946  * Entry point for name resolution
 947  * Setup a new query and try to resolve
 948  *
 949  * @param request the request handle of the DNS request from a client
 950  * @param p the DNS query packet we received
 951  * @param q the DNS query we received parsed from p
 952  */
 953 static void
 954 start_resolution(struct GNUNET_DNS_RequestHandle *request,
 955                  struct GNUNET_DNSPARSER_Packet *p,
 956                  struct GNUNET_DNSPARSER_Query *q)
 957 {
 958   struct GNUNET_GNS_ResolverHandle *rh;
 959
 960   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 961               "Starting resolution for %s (type=%d)!\n",
 962               q->name, q->type);
 963
 964   rh = GNUNET_malloc(sizeof (struct GNUNET_GNS_ResolverHandle));
 965   rh->packet = p;
 966   rh->query = q;
 967   rh->authority = zone_hash;
 968
 969   rh->name = GNUNET_malloc(strlen(q->name)
 970                               - strlen(gnunet_tld) + 1);
 971   memset(rh->name, 0,
 972          strlen(q->name)-strlen(gnunet_tld) + 1);
 973   memcpy(rh->name, q->name,
 974          strlen(q->name)-strlen(gnunet_tld));
 975
 976   rh->request_handle = request;
 977
 978   /* Start resolution in our zone */
 979   resolve_name(rh);
 980 }
 981
 982 /**
 983  * The DNS request handler
 984  * Called for every incoming DNS request.
 985  *
 986  * @param cls closure
 987  * @param rh request handle to user for reply
 988  * @param request_length number of bytes in request
 989  * @param request udp payload of the DNS request
 990  */
 991 static void
 992 handle_dns_request(void *cls,
 993                    struct GNUNET_DNS_RequestHandle *rh,
 994                    size_t request_length,
 995                    const char *request)
 996 {
 997   struct GNUNET_DNSPARSER_Packet *p;
 998   char *tldoffset;
 999
1000   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Hijacked a DNS request...processing\n");
1001   p = GNUNET_DNSPARSER_parse (request, request_length);
1002
1003   if (NULL == p)
1004   {
1005     GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1006                 "Received malformed DNS packet, leaving it untouched\n");
1007     GNUNET_DNS_request_forward (rh);
1008     return;
1009   }
1010
1011   /**
1012    * Check tld and decide if we or
1013    * legacy dns is responsible
1014    *
1015    * FIXME now in theory there could be more than 1 query in the request
1016    * but if this is case we get into trouble:
1017    * either we query the GNS or the DNS. We cannot do both!
1018    * So I suggest to either only allow a single query per request or
1019    * only allow GNS or DNS requests.
1020    * The way it is implemented here now is buggy and will lead to erratic
1021    * behaviour (if multiple queries are present).
1022    */
1023   if (p->num_queries == 0)
1024   {
1025     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1026                 "No Queries in DNS packet... forwarding\n");
1027     GNUNET_DNS_request_forward (rh);
1028   }
1029
1030   if (p->num_queries > 1)
1031   {
1032     /* Note: We could also look for .gnunet */
1033     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1034                 ">1 queriy in DNS packet... odd. We only process #1\n");
1035   }
1036
1037
1038   /**
1039    * Check for .gnunet
1040    */
1041   tldoffset = p->queries[0].name + strlen(p->queries[0].name);
1042
1043   while ((*tldoffset) != '.')
1044     tldoffset--;
1045
1046   if (0 == strcmp(tldoffset, gnunet_tld))
1047   {
1048     start_resolution(rh, p, p->queries);
1049   }
1050   else
1051   {
1052     /**
1053      * This request does not concern us. Forward to real DNS.
1054      */
1055     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
1056                "Request for %s is forwarded to DNS\n", p->queries[0].name);
1057     GNUNET_DNS_request_forward (rh);
1058   }
1059
1060 }
1061
1062 /**
1063  * test function that stores some data in the namestore
1064  * This will also be replaced by a test progrm that
1065  * directl interfaces with the namestore
1066  */
1067 static void
1068 put_some_records(void)
1069 {
1070   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Populating namestore\n");
1071   /* put an A record into namestore FIXME use gnunet.org */
1072   char* ipB = "5.6.7.8";
1073
1074   struct in_addr *web = GNUNET_malloc(sizeof(struct in_addr));
1075   struct GNUNET_NAMESTORE_RecordData rdb_web;
1076
1077   GNUNET_assert(1 == inet_pton (AF_INET, ipB, web));
1078
1079   rdb_web.data_size = sizeof(struct in_addr);
1080   rdb_web.data = web;
1081   rdb_web.record_type = GNUNET_DNSPARSER_TYPE_A;
1082   rdb_web.expiration = GNUNET_TIME_absolute_get_forever ();
1083
1084   GNUNET_NAMESTORE_record_create (namestore_handle,
1085                                   zone_key,
1086                                   "www",
1087                                   &rdb_web,
1088                                   NULL,
1089                                   NULL);
1090 }
1091
1092 /**
1093  * Method called periodicattluy that triggers
1094  * iteration over root zone
1095  *
1096  * @param cls closure
1097  * @param tc task context
1098  */
1099 static void
1100 update_zone_dht_next(void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1101 {
1102   GNUNET_NAMESTORE_zone_iterator_next(namestore_iter);
1103 }
1104
1105 /**
1106  * Continuation for DHT put
1107  *
1108  * @param cls closure
1109  * @param tc task context
1110  */
1111 static void
1112 record_dht_put(void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1113 {
1114   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "put request transmitted\n");
1115 }
1116
1117 /* prototype */
1118 static void
1119 update_zone_dht_start(void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
1120
1121 /**
1122  * Function used to put all records successively into the DHT.
1123  *
1124  * @param cls the closure (NULL)
1125  * @param key the public key of the authority (ours)
1126  * @param expiration lifetime of the namestore entry
1127  * @param name the name of the records
1128  * @param rd_count the number of records in data
1129  * @param rd the record data
1130  * @param signature the signature for the record data
1131  */
1132 static void
1133 put_gns_record(void *cls,
1134                 const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *key,
1135                 struct GNUNET_TIME_Absolute expiration,
1136                 const char *name,
1137                 unsigned int rd_count,
1138                 const struct GNUNET_NAMESTORE_RecordData *rd,
1139                 const struct GNUNET_CRYPTO_RsaSignature *signature)
1140 {
1141
1142   struct GNSNameRecordBlock *nrb;
1143   GNUNET_HashCode name_hash;
1144   GNUNET_HashCode xor_hash;
1145   struct GNUNET_CRYPTO_HashAsciiEncoded xor_hash_string;
1146   uint32_t rd_payload_length;
1147   char* nrb_data = NULL;
1148
1149   /* we're done */
1150   if (NULL == name)
1151   {
1152     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Zone iteration finished\n");
1153     GNUNET_NAMESTORE_zone_iteration_stop (namestore_iter);
1154     zone_update_taskid = GNUNET_SCHEDULER_add_now (&update_zone_dht_start,
1155                                                    NULL);
1156     return;
1157   }
1158
1159   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
1160              "Putting records for %s into the DHT\n", name);
1161
1162   rd_payload_length = GNUNET_NAMESTORE_records_get_size (rd_count, rd);
1163
1164   nrb = GNUNET_malloc(rd_payload_length + strlen(name) + 1
1165                       + sizeof(struct GNSNameRecordBlock));
1166
1167   if (signature != NULL)
1168     nrb->signature = *signature;
1169
1170   nrb->public_key = *key;
1171
1172   nrb->rd_count = htonl(rd_count);
1173
1174   memset(&nrb[1], 0, strlen(name) + 1);
1175   memcpy(&nrb[1], name, strlen(name));
1176
1177   nrb_data = (char*)&nrb[1];
1178   nrb_data += strlen(name) + 1;
1179
1180   if (-1 == GNUNET_NAMESTORE_records_serialize (rd_count,
1181                                                 rd,
1182                                                 rd_payload_length,
1183                                                 nrb_data))
1184   {
1185     GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Recor serialization failed!\n");
1186   }
1187
1188
1189   /*
1190    * calculate DHT key: H(name) xor H(pubkey)
1191    */
1192   GNUNET_CRYPTO_hash(name, strlen(name), &name_hash);
1193   GNUNET_CRYPTO_hash_xor(&zone_hash, &name_hash, &xor_hash);
1194   GNUNET_CRYPTO_hash_to_enc (&xor_hash, &xor_hash_string);
1195   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
1196              "putting records for %s under key: %s with size %d\n",
1197              name, (char*)&xor_hash_string, rd_payload_length);
1198
1199   GNUNET_DHT_put (dht_handle, &xor_hash,
1200                   DHT_GNS_REPLICATION_LEVEL,
1201                   GNUNET_DHT_RO_NONE,
1202                   GNUNET_BLOCK_TYPE_GNS_NAMERECORD,
1203                   rd_payload_length,
1204                   (char*)nrb,
1205                   expiration,
1206                   DHT_OPERATION_TIMEOUT,
1207                   &record_dht_put,
1208                   NULL); //cls for cont
1209
1210   num_public_records++;
1211
1212   /**
1213    * Reschedule periodic put
1214    */
1215   zone_update_taskid = GNUNET_SCHEDULER_add_delayed (dht_update_interval,
1216                                 &update_zone_dht_next,
1217                                 NULL);
1218
1219 }
1220
1221 /**
1222  * Puts a single trusted entity into the
1223  * namestore. Will be replaced in a testcase
1224  * that directly interacts with a persistent
1225  * namestore.
1226  *
1227  * @param name name of entity
1228  * @param keyfile keyfile
1229  */
1230 static void
1231 put_trusted(char* name, char* keyfile)
1232 {
1233   struct GNUNET_NAMESTORE_RecordData rd;
1234   struct GNUNET_CRYPTO_RsaPrivateKey *key;
1235   struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *pkey;
1236   pkey = GNUNET_malloc(sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
1237
1238   key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
1239   GNUNET_CRYPTO_rsa_key_get_public (key, pkey);
1240   rd.data = pkey;
1241   rd.expiration = GNUNET_TIME_absolute_get_forever ();
1242   rd.data_size = sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded);
1243   rd.record_type = GNUNET_GNS_RECORD_PKEY;
1244
1245   GNUNET_NAMESTORE_record_create (namestore_handle,
1246                                   zone_key,
1247                                   name,
1248                                   &rd,
1249                                   NULL,
1250                                   NULL);
1251 }
1252
1253
1254
1255 /**
1256  * Periodically iterate over our zone and store everything in dht
1257  *
1258  * @param cls NULL
1259  * @param tc task context
1260  */
1261 static void
1262 update_zone_dht_start(void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1263 {
1264   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Starting DHT zone update!\n");
1265   if (0 == num_public_records)
1266   {
1267     dht_update_interval = GNUNET_TIME_relative_multiply(
1268                                                       GNUNET_TIME_UNIT_SECONDS,
1269                                                       1);
1270   }
1271   else
1272   {
1273     dht_update_interval = GNUNET_TIME_relative_multiply(
1274                                                       GNUNET_TIME_UNIT_SECONDS,
1275                                                      (3600/num_public_records));
1276   }
1277   num_public_records = 0; //start counting again
1278   namestore_iter = GNUNET_NAMESTORE_zone_iteration_start (namestore_handle,
1279                                                           &zone_hash,
1280                                                           GNUNET_NAMESTORE_RF_AUTHORITY,
1281                                                           GNUNET_NAMESTORE_RF_PRIVATE,
1282                                                           &put_gns_record,
1283                                                           NULL);
1284 }
1285
1286 /**
1287  * Process GNS requests.
1288  *
1289  * @param cls closure
1290  * @param server the initialized server
1291  * @param c configuration to use
1292  */
1293 static void
1294 run (void *cls, struct GNUNET_SERVER_Handle *server,
1295      const struct GNUNET_CONFIGURATION_Handle *c)
1296 {
1297
1298   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Initializing GNS\n");
1299
1300   char* keyfile;
1301   char* trusted_entities;
1302   struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pkey;
1303
1304   if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (c, "gns",
1305                                              "ZONEKEY", &keyfile))
1306   {
1307     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1308                 "No private key for root zone specified%s!\n", keyfile);
1309     GNUNET_SCHEDULER_shutdown(0);
1310     return;
1311   }
1312
1313   zone_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
1314   GNUNET_CRYPTO_rsa_key_get_public (zone_key, &pkey);
1315
1316   GNUNET_CRYPTO_hash(&pkey, sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
1317                      &zone_hash);
1318
1319   nc = GNUNET_SERVER_notification_context_create (server, 1);
1320
1321   GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
1322                                 NULL);
1323
1324   if (GNUNET_YES ==
1325       GNUNET_CONFIGURATION_get_value_yesno (c, "gns",
1326                                             "HIJACK_DNS"))
1327   {
1328     GNUNET_log(GNUNET_ERROR_TYPE_INFO,
1329                "DNS hijacking enabled... connecting to service.\n");
1330     /**
1331      * Do gnunet dns init here
1332      */
1333     dns_handle = GNUNET_DNS_connect(c,
1334                                     GNUNET_DNS_FLAG_PRE_RESOLUTION,
1335                                     &handle_dns_request, /* rh */
1336                                     NULL); /* Closure */
1337     if (NULL == dns_handle)
1338     {
1339       GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
1340                "Failed to connect to the dnsservice!\n");
1341     }
1342   }
1343
1344
1345
1346   /**
1347    * handle to our local namestore
1348    */
1349   namestore_handle = GNUNET_NAMESTORE_connect(c);
1350
1351   if (NULL == namestore_handle)
1352   {
1353     //FIXME do error handling;
1354     GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
1355                "Failed to connect to the namestore!\n");
1356     GNUNET_SCHEDULER_shutdown(0);
1357     return;
1358   }
1359
1360   /**
1361    * handle to the dht
1362    */
1363   dht_handle = GNUNET_DHT_connect(c, 1); //FIXME get ht_len from cfg
1364
1365   if (NULL == dht_handle)
1366   {
1367     GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Could not connect to DHT!\n");
1368   }
1369
1370   //put_some_records(); //FIXME for testing
1371
1372   /**
1373    * Schedule periodic put
1374    * for our records
1375    * We have roughly an hour for all records;
1376    */
1377   dht_update_interval = GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS,
1378                                                       1);
1379   //zone_update_taskid = GNUNET_SCHEDULER_add_now (&update_zone_dht_start, NULL);
1380
1381 }
1382
1383
1384 /**
1385  * The main function for the GNS service.
1386  *
1387  * @param argc number of arguments from the command line
1388  * @param argv command line arguments
1389  * @return 0 ok, 1 on error
1390  */
1391 int
1392 main (int argc, char *const *argv)
1393 {
1394   int ret;
1395
1396   ret =
1397       (GNUNET_OK ==
1398        GNUNET_SERVICE_run (argc, argv, "gns", GNUNET_SERVICE_OPTION_NONE, &run,
1399                            NULL)) ? 0 : 1;
1400   return ret;
1401 }
1402
1403 /* end of gnunet-service-gns.c */