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  * @file gns/gnunet-service-gns.c
  24  * @brief GNUnet GNS service
  25  * @author Martin Schanzenbach
  26  */
  27 #include "platform.h"
  28 #include "gnunet_util_lib.h"
  29 #include "gnunet_transport_service.h"
  30 #include "gnunet_dns_service.h"
  31 #include "gnunet_dnsparser_lib.h"
  32 #include "gnunet_dht_service.h"
  33 #include "gnunet_namestore_service.h"
  34 #include "gnunet_gns_service.h"
  35 #include "block_gns.h"
  36 #include "gns.h"
  37 #include "gnunet-service-gns_resolver.h"
  38 #include "gnunet-service-gns_interceptor.h"
  39
  40 /* FIXME move to proper header in include */
  41 #define GNUNET_MESSAGE_TYPE_GNS_LOOKUP 23
  42 #define GNUNET_MESSAGE_TYPE_GNS_LOOKUP_RESULT 24
  43 #define GNUNET_MESSAGE_TYPE_GNS_SHORTEN 25
  44 #define GNUNET_MESSAGE_TYPE_GNS_SHORTEN_RESULT 26
  45 #define GNUNET_MESSAGE_TYPE_GNS_GET_AUTH 27
  46 #define GNUNET_MESSAGE_TYPE_GNS_GET_AUTH_RESULT 28
  47
  48
  49 /**
  50  * Handle to a shorten operation from api
  51  */
  52 struct ClientShortenHandle
  53 {
  54   /* the requesting client that */
  55   struct GNUNET_SERVER_Client *client;
  56
  57   /* request id */
  58   uint64_t unique_id;
  59
  60   /* request type */
  61   enum GNUNET_GNS_RecordType type;
  62
  63   /* optional zone private key used for shorten */
  64   struct GNUNET_CRYPTO_RsaPrivateKey *shorten_key;
  65
  66   /* name to shorten */
  67   char name[MAX_DNS_NAME_LENGTH];
  68
  69   /* root zone */
  70   struct GNUNET_CRYPTO_ShortHashCode root_zone;
  71
  72   /* private zone */
  73   struct GNUNET_CRYPTO_ShortHashCode private_zone;
  74
  75   /* shorten zone */
  76   struct GNUNET_CRYPTO_ShortHashCode shorten_zone;
  77 };
  78
  79
  80 /**
  81  * Handle to a get auhtority operation from api
  82  */
  83 struct ClientGetAuthHandle
  84 {
  85   /* the requesting client that */
  86   struct GNUNET_SERVER_Client *client;
  87
  88   /* request id */
  89   uint64_t unique_id;
  90
  91   /* name to lookup authority */
  92   char* name;
  93
  94 };
  95
  96
  97 /**
  98  * Handle to a lookup operation from api
  99  */
 100 struct ClientLookupHandle
 101 {
 102   /* the requesting client that */
 103   struct GNUNET_SERVER_Client *client;
 104
 105   /* The zone we look up in */
 106   struct GNUNET_CRYPTO_ShortHashCode zone;
 107
 108   /* Do we only want to lookup from local cache? */
 109   int only_cached;
 110
 111   /* request id */
 112   uint64_t unique_id;
 113
 114   /* request type */
 115   enum GNUNET_GNS_RecordType type;
 116
 117   /* optional zone private key used for shorten */
 118   struct GNUNET_CRYPTO_RsaPrivateKey *shorten_key;
 119
 120   /* the name to look up */
 121   char* name; //Needed?
 122 };
 123
 124 /**
 125  * Our handle to the DHT
 126  */
 127 static struct GNUNET_DHT_Handle *dht_handle;
 128
 129 /**
 130  * Our zone's private key
 131  */
 132 struct GNUNET_CRYPTO_RsaPrivateKey *zone_key;
 133
 134 /**
 135  * Our handle to the namestore service
 136  * FIXME maybe need a second handle for iteration
 137  */
 138 struct GNUNET_NAMESTORE_Handle *namestore_handle;
 139
 140 /**
 141  * Handle to iterate over our authoritative zone in namestore
 142  */
 143 struct GNUNET_NAMESTORE_ZoneIterator *namestore_iter;
 144
 145 /**
 146  * The configuration the GNS service is running with
 147  */
 148 const struct GNUNET_CONFIGURATION_Handle *GNS_cfg;
 149
 150 /**
 151  * Our notification context.
 152  */
 153 static struct GNUNET_SERVER_NotificationContext *nc;
 154
 155 /**
 156  * Our zone hash
 157  */
 158 struct GNUNET_CRYPTO_ShortHashCode zone_hash;
 159
 160 /**
 161  * Useful for zone update for DHT put
 162  */
 163 static int num_public_records;
 164
 165 /**
 166  * update interval in seconds
 167  */
 168 static unsigned long long max_record_put_interval;
 169
 170 static unsigned long long dht_max_update_interval;
 171
 172 /* dht update interval FIXME define? */
 173 static struct GNUNET_TIME_Relative record_put_interval;
 174
 175 /* zone update task */
 176 GNUNET_SCHEDULER_TaskIdentifier zone_update_taskid = GNUNET_SCHEDULER_NO_TASK;
 177
 178 /* automatic pkey import for name shortening */
 179 static int auto_import_pkey;
 180
 181 /* lookup timeout */
 182 static struct GNUNET_TIME_Relative default_lookup_timeout;
 183
 184 /* name of the private zone */
 185 static char *private_zone_id;
 186
 187 /* name of the public zone */
 188 static char *shorten_zone_id;
 189
 190 /**
 191  * Continue shutdown
 192  */
 193 static void
 194 on_resolver_cleanup(void)
 195 {
 196   GNUNET_NAMESTORE_disconnect(namestore_handle, 1);
 197   GNUNET_DHT_disconnect(dht_handle);
 198 }
 199
 200 /**
 201  * Task run during shutdown.
 202  *
 203  * @param cls unused
 204  * @param tc unused
 205  */
 206 static void
 207 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
 208 {
 209
 210   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 211              "Shutting down!");
 212
 213
 214   GNUNET_SERVER_notification_context_destroy (nc);
 215
 216   gns_interceptor_stop();
 217   gns_resolver_cleanup(&on_resolver_cleanup);
 218   /* Kill zone task for it may make the scheduler hang */
 219   if (zone_update_taskid != GNUNET_SCHEDULER_NO_TASK)
 220     GNUNET_SCHEDULER_cancel(zone_update_taskid);
 221 }
 222
 223
 224 /**
 225  * Method called periodicattluy that triggers
 226  * iteration over root zone
 227  *
 228  * @param cls closure
 229  * @param tc task context
 230  */
 231 static void
 232 update_zone_dht_next(void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
 233 {
 234   zone_update_taskid = GNUNET_SCHEDULER_NO_TASK;
 235   GNUNET_NAMESTORE_zone_iterator_next(namestore_iter);
 236 }
 237
 238 /**
 239  * Continuation for DHT put
 240  *
 241  * @param cls closure
 242  * @param success GNUNET_OK if the PUT was transmitted,
 243  *                GNUNET_NO on timeout,
 244  *                GNUNET_SYSERR on disconnect from service
 245  *                after the PUT message was transmitted
 246  *                (so we don't know if it was received or not)
 247  */
 248 static void
 249 record_dht_put(void *cls, int success)
 250 {
 251   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "put request transmitted\n");
 252 }
 253
 254 /* prototype */
 255 static void
 256 update_zone_dht_start(void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
 257
 258 /**
 259  * Function used to put all records successively into the DHT.
 260  *
 261  * @param cls the closure (NULL)
 262  * @param key the public key of the authority (ours)
 263  * @param expiration lifetime of the namestore entry
 264  * @param name the name of the records
 265  * @param rd_count the number of records in data
 266  * @param rd the record data
 267  * @param signature the signature for the record data
 268  */
 269 static void
 270 put_gns_record(void *cls,
 271                 const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *key,
 272                 struct GNUNET_TIME_Absolute expiration,
 273                 const char *name,
 274                 unsigned int rd_count,
 275                 const struct GNUNET_NAMESTORE_RecordData *rd,
 276                 const struct GNUNET_CRYPTO_RsaSignature *signature)
 277 {
 278
 279   struct GNSNameRecordBlock *nrb;
 280   struct GNUNET_CRYPTO_ShortHashCode name_hash;
 281   struct GNUNET_CRYPTO_ShortHashCode zhash;
 282   struct GNUNET_HashCode xor_hash;
 283   struct GNUNET_HashCode name_hash_double;
 284   struct GNUNET_HashCode zone_hash_double;
 285   uint32_t rd_payload_length;
 286   char* nrb_data = NULL;
 287   size_t namelen;
 288
 289   /* we're done */
 290   if (NULL == name)
 291   {
 292     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 293                "Zone iteration finished. Rescheduling put in %ds\n",
 294                dht_max_update_interval);
 295     zone_update_taskid = GNUNET_SCHEDULER_add_delayed (
 296                                         GNUNET_TIME_relative_multiply(
 297                                             GNUNET_TIME_UNIT_SECONDS,
 298                                             dht_max_update_interval
 299                                             ),
 300                                             &update_zone_dht_start,
 301                                             NULL);
 302     return;
 303   }
 304
 305   namelen = strlen(name) + 1;
 306
 307   if (signature == NULL)
 308   {
 309     GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
 310                "No signature for %s record data provided! Skipping...\n",
 311                name);
 312     zone_update_taskid = GNUNET_SCHEDULER_add_now (&update_zone_dht_next,
 313                                                    NULL);
 314     return;
 315
 316   }
 317
 318   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 319              "Putting records for %s into the DHT\n", name);
 320
 321   rd_payload_length = GNUNET_NAMESTORE_records_get_size (rd_count, rd);
 322
 323   nrb = GNUNET_malloc(rd_payload_length + namelen
 324                       + sizeof(struct GNSNameRecordBlock));
 325
 326   nrb->signature = *signature;
 327
 328   nrb->public_key = *key;
 329
 330   nrb->rd_count = htonl(rd_count);
 331
 332   memcpy(&nrb[1], name, namelen);
 333
 334   nrb_data = (char*)&nrb[1];
 335   nrb_data += namelen;
 336
 337   rd_payload_length += sizeof(struct GNSNameRecordBlock) + namelen;
 338
 339   if (-1 == GNUNET_NAMESTORE_records_serialize (rd_count,
 340                                                 rd,
 341                                                 rd_payload_length,
 342                                                 nrb_data))
 343   {
 344     GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
 345                "Record serialization failed! Skipping...\n");
 346     GNUNET_free(nrb);
 347     zone_update_taskid = GNUNET_SCHEDULER_add_now (&update_zone_dht_next,
 348                                                    NULL);
 349     return;
 350   }
 351
 352
 353   /*
 354    * calculate DHT key: H(name) xor H(pubkey)
 355    */
 356   GNUNET_CRYPTO_short_hash(key,
 357                      sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
 358                      &zhash);
 359   GNUNET_CRYPTO_short_hash(name, strlen(name), &name_hash);
 360   GNUNET_CRYPTO_short_hash_double (&name_hash, &name_hash_double);
 361   GNUNET_CRYPTO_short_hash_double (&zhash, &zone_hash_double);
 362   GNUNET_CRYPTO_hash_xor(&zone_hash_double, &name_hash_double, &xor_hash);
 363
 364   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 365              "zone identity: %s\n", GNUNET_h2s (&zone_hash_double));
 366
 367   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 368              "putting records for %s under key: %s with size %d\n",
 369              name, GNUNET_h2s (&xor_hash), rd_payload_length);
 370
 371   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 372              "DHT req to %d\n", DHT_OPERATION_TIMEOUT.rel_value);
 373   /* FIXME: keep return value to possibly cancel? */
 374   GNUNET_DHT_put (dht_handle, &xor_hash,
 375                   DHT_GNS_REPLICATION_LEVEL,
 376                   GNUNET_DHT_RO_NONE,
 377                   GNUNET_BLOCK_TYPE_GNS_NAMERECORD,
 378                   rd_payload_length,
 379                   (char*)nrb,
 380                   expiration,
 381                   DHT_OPERATION_TIMEOUT,
 382                   &record_dht_put,
 383                   NULL); //cls for cont
 384
 385   num_public_records++;
 386
 387   /**
 388    * Reschedule periodic put
 389    */
 390   zone_update_taskid = GNUNET_SCHEDULER_add_delayed (record_put_interval,
 391                                 &update_zone_dht_next,
 392                                 NULL);
 393
 394   GNUNET_free(nrb);
 395
 396 }
 397
 398 /**
 399  * Periodically iterate over our zone and store everything in dht
 400  *
 401  * @param cls NULL
 402  * @param tc task context
 403  */
 404 static void
 405 update_zone_dht_start(void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
 406 {
 407   unsigned long long interval = 0;
 408
 409   zone_update_taskid = GNUNET_SCHEDULER_NO_TASK;
 410
 411   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Scheduling DHT zone update!\n");
 412   if (0 == num_public_records)
 413   {
 414     /**
 415      * If no records are known (startup) or none present
 416      * we can safely set the interval to 1s
 417      */
 418     record_put_interval = GNUNET_TIME_relative_multiply(
 419                                             GNUNET_TIME_UNIT_SECONDS,
 420                                             1);
 421     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 422                "No records in db. Adjusted record put interval to 1s\n");
 423   }
 424   else
 425   {
 426     interval = max_record_put_interval/num_public_records;
 427     if (interval == 0)
 428       interval = 1;
 429     record_put_interval = GNUNET_TIME_relative_multiply(
 430                                   GNUNET_TIME_UNIT_SECONDS,
 431                                   interval);
 432     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 433                "Adjusted DHT update interval to %ds!\n",
 434                interval);
 435   }
 436
 437   /* start counting again */
 438   num_public_records = 0;
 439   namestore_iter = GNUNET_NAMESTORE_zone_iteration_start (namestore_handle,
 440                                                  NULL, //All zones
 441                                                  GNUNET_NAMESTORE_RF_AUTHORITY,
 442                                                  GNUNET_NAMESTORE_RF_PRIVATE,
 443                                                  &put_gns_record,
 444                                                  NULL);
 445 }
 446
 447 /* END DHT ZONE PROPAGATION */
 448
 449 /**
 450  * Send shorten response back to client
 451  *
 452  * @param cls the closure containing a client shorten handle
 453  * @param name the shortened name result or NULL if cannot be shortened
 454  */
 455 static void
 456 send_shorten_response(void* cls, const char* name)
 457 {
 458   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending `%s' message with %s\n",
 459               "SHORTEN_RESULT", name);
 460   struct GNUNET_GNS_ClientShortenResultMessage *rmsg;
 461   struct ClientShortenHandle *csh = (struct ClientShortenHandle *)cls;
 462
 463   if (name == NULL)
 464   {
 465     name = "";
 466   }
 467
 468   rmsg = GNUNET_malloc(sizeof(struct GNUNET_GNS_ClientShortenResultMessage)
 469                        + strlen(name) + 1);
 470
 471   rmsg->id = csh->unique_id;
 472   rmsg->header.type = htons(GNUNET_MESSAGE_TYPE_GNS_SHORTEN_RESULT);
 473   rmsg->header.size =
 474     htons(sizeof(struct GNUNET_GNS_ClientShortenResultMessage) +
 475           strlen(name) + 1);
 476
 477   strcpy((char*)&rmsg[1], name);
 478
 479   GNUNET_SERVER_notification_context_unicast (nc, csh->client,
 480                               (const struct GNUNET_MessageHeader *) rmsg,
 481                               GNUNET_NO);
 482   GNUNET_SERVER_receive_done (csh->client, GNUNET_OK);
 483
 484   GNUNET_free(rmsg);
 485   GNUNET_free_non_null(csh->shorten_key);
 486   GNUNET_free(csh);
 487
 488 }
 489
 490
 491 static void
 492 process_shorten_zone_shorten (void *cls,
 493                       const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *key,
 494                       struct GNUNET_TIME_Absolute expiration,
 495                       const char *name,
 496                       unsigned int rd_count,
 497                       const struct GNUNET_NAMESTORE_RecordData *rd,
 498                       const struct GNUNET_CRYPTO_RsaSignature *signature)
 499 {
 500   struct ClientShortenHandle *csh = cls;
 501   struct GNUNET_TIME_Relative remaining_time;
 502   struct GNUNET_TIME_Absolute et;
 503
 504   remaining_time = GNUNET_TIME_absolute_get_remaining (expiration);
 505
 506   if ((rd_count == 1) &&
 507       (remaining_time.rel_value != 0))
 508   {
 509     GNUNET_break (0 == (rd->flags & GNUNET_NAMESTORE_RF_RELATIVE_EXPIRATION));
 510     et.abs_value = rd->expiration_time;
 511     remaining_time = GNUNET_TIME_absolute_get_remaining (et);
 512     if ((rd->record_type == GNUNET_GNS_RECORD_PKEY) &&
 513         (remaining_time.rel_value != 0))
 514     {
 515       csh->shorten_zone = *((struct GNUNET_CRYPTO_ShortHashCode*)rd->data);
 516     }
 517   }
 518   gns_resolver_shorten_name (&csh->root_zone,
 519                              &csh->private_zone,
 520                              &csh->shorten_zone,
 521                              csh->name,
 522                              private_zone_id,
 523                              shorten_zone_id,
 524                              &send_shorten_response, csh);
 525
 526 }
 527
 528
 529 static void
 530 process_private_zone_shorten (void *cls,
 531                       const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *key,
 532                       struct GNUNET_TIME_Absolute expiration,
 533                       const char *name,
 534                       unsigned int rd_count,
 535                       const struct GNUNET_NAMESTORE_RecordData *rd,
 536                       const struct GNUNET_CRYPTO_RsaSignature *signature)
 537 {
 538   struct GNUNET_TIME_Relative remaining_time;
 539   struct ClientShortenHandle *csh = cls;
 540   struct GNUNET_TIME_Absolute et;
 541
 542   remaining_time = GNUNET_TIME_absolute_get_remaining (expiration);
 543
 544   if ((rd_count == 1) &&
 545       (remaining_time.rel_value != 0))
 546   {
 547     GNUNET_break (0 == (rd->flags & GNUNET_NAMESTORE_RF_RELATIVE_EXPIRATION));
 548     et.abs_value = rd->expiration_time;
 549     remaining_time = GNUNET_TIME_absolute_get_remaining (et);
 550     if ((rd->record_type == GNUNET_GNS_RECORD_PKEY) &&
 551         (remaining_time.rel_value != 0))
 552     {
 553
 554
 555       GNUNET_log (GNUNET_ERROR_TYPE_INFO,
 556                   "Looking for shorten zone in private zone\n");
 557       csh->private_zone = *((struct GNUNET_CRYPTO_ShortHashCode*)rd->data);
 558       GNUNET_NAMESTORE_lookup_record (namestore_handle,
 559                                       &csh->private_zone,
 560                                       shorten_zone_id,
 561                                       GNUNET_GNS_RECORD_ANY,
 562                                       &process_shorten_zone_shorten,
 563                                       cls);
 564     }
 565     return;
 566   }
 567
 568   GNUNET_log (GNUNET_ERROR_TYPE_INFO,
 569               "No private zone found!\n");
 570   gns_resolver_shorten_name (&csh->root_zone,
 571                              &csh->private_zone,
 572                              &csh->shorten_zone,
 573                              csh->name,
 574                              private_zone_id,
 575                              shorten_zone_id,
 576                              &send_shorten_response, csh);
 577
 578 }
 579
 580 /**
 581  * Lookup the zone infos and shorten name
 582  *
 583  * @param csh the shorten handle
 584  *
 585  */
 586 static void
 587 start_shorten_name (struct ClientShortenHandle *csh)
 588 {
 589   GNUNET_log (GNUNET_ERROR_TYPE_INFO,
 590               "Looking for private zone in root zone\n");
 591
 592   GNUNET_NAMESTORE_lookup_record (namestore_handle,
 593                                   &csh->root_zone,
 594                                   private_zone_id,
 595                                   GNUNET_GNS_RECORD_ANY,
 596                                   &process_private_zone_shorten,
 597                                   csh);
 598 }
 599
 600
 601 /**
 602  * Handle a shorten message from the api
 603  *
 604  * @param cls the closure
 605  * @param client the client
 606  * @param message the message
 607  */
 608 static void handle_shorten (void *cls,
 609                             struct GNUNET_SERVER_Client * client,
 610                             const struct GNUNET_MessageHeader * message)
 611 {
 612   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' message\n", "SHORTEN");
 613
 614   size_t msg_size = 0;
 615   struct ClientShortenHandle *csh;
 616   char name[MAX_DNS_NAME_LENGTH];
 617   char* nameptr = name;
 618
 619   if (ntohs (message->size) < sizeof (struct GNUNET_GNS_ClientShortenMessage))
 620   {
 621     GNUNET_break_op (0);
 622     GNUNET_SERVER_receive_done (client, GNUNET_OK);
 623     return;
 624   }
 625
 626
 627   struct GNUNET_GNS_ClientShortenMessage *sh_msg =
 628     (struct GNUNET_GNS_ClientShortenMessage *) message;
 629
 630   msg_size = ntohs(message->size);
 631
 632   if (msg_size > GNUNET_SERVER_MAX_MESSAGE_SIZE)
 633   {
 634     GNUNET_break_op (0);
 635     GNUNET_SERVER_receive_done (client, GNUNET_OK);
 636     return;
 637   }
 638
 639   csh = GNUNET_malloc(sizeof(struct ClientShortenHandle));
 640   csh->client = client;
 641   csh->unique_id = sh_msg->id;
 642   csh->shorten_key = NULL;
 643
 644   GNUNET_STRINGS_utf8_tolower((char*)&sh_msg[1], &nameptr);
 645
 646   if (strlen (name) < strlen(GNUNET_GNS_TLD)) {
 647     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 648                "SHORTEN: %s is too short", name);
 649     send_shorten_response(csh, name);
 650     return;
 651   }
 652
 653   if (strlen (name) > MAX_DNS_NAME_LENGTH) {
 654     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 655                "SHORTEN: %s is too long", name);
 656     send_shorten_response(csh, name);
 657     return;
 658   }
 659
 660   if (!is_gnunet_tld(name) && !is_zkey_tld(name))
 661   {
 662     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 663                 "%s is not our domain. Returning\n", name);
 664     send_shorten_response(csh, name);
 665     return;
 666   }
 667
 668   strcpy (csh->name, name);
 669
 670   GNUNET_SERVER_notification_context_add (nc, client);
 671
 672   if (1 == ntohl(sh_msg->use_default_zone))
 673     csh->root_zone = zone_hash; //Default zone
 674   else
 675     csh->root_zone = sh_msg->zone;
 676
 677   start_shorten_name (csh);
 678
 679 }
 680
 681
 682 /**
 683  * Send get authority response back to client
 684  *
 685  * @param cls the closure containing a client get auth handle
 686  * @param name the shortened name result or NULL if cannot be shortened
 687  */
 688 static void
 689 send_get_auth_response(void *cls, const char* name)
 690 {
 691   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending `%s' message with %s\n",
 692               "GET_AUTH_RESULT", name);
 693   struct GNUNET_GNS_ClientGetAuthResultMessage *rmsg;
 694   struct ClientGetAuthHandle *cah = (struct ClientGetAuthHandle *)cls;
 695
 696   if (name == NULL)
 697   {
 698     name = "";
 699   }
 700
 701   rmsg = GNUNET_malloc(sizeof(struct GNUNET_GNS_ClientGetAuthResultMessage)
 702                        + strlen(name) + 1);
 703
 704   rmsg->id = cah->unique_id;
 705   rmsg->header.type = htons(GNUNET_MESSAGE_TYPE_GNS_GET_AUTH_RESULT);
 706   rmsg->header.size =
 707     htons(sizeof(struct GNUNET_GNS_ClientGetAuthResultMessage) +
 708           strlen(name) + 1);
 709
 710   strcpy((char*)&rmsg[1], name);
 711
 712   GNUNET_SERVER_notification_context_unicast (nc, cah->client,
 713                               (const struct GNUNET_MessageHeader *) rmsg,
 714                               GNUNET_NO);
 715   GNUNET_SERVER_receive_done (cah->client, GNUNET_OK);
 716
 717   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Cleaning up handles...\n");
 718
 719   GNUNET_free(rmsg);
 720   GNUNET_free_non_null(cah->name);
 721   GNUNET_free(cah);
 722
 723   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "done.\n");
 724
 725 }
 726
 727
 728 /**
 729  * Handle a get authority message from the api
 730  *
 731  * @param cls the closure
 732  * @param client the client
 733  * @param message the message
 734  */
 735 static void handle_get_authority(void *cls,
 736                            struct GNUNET_SERVER_Client * client,
 737                            const struct GNUNET_MessageHeader * message)
 738 {
 739   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' message\n", "GET_AUTH");
 740
 741   size_t msg_size = 0;
 742   struct ClientGetAuthHandle *cah;
 743   char name[MAX_DNS_NAME_LENGTH];
 744   char* nameptr = name;
 745
 746
 747   if (ntohs (message->size) < sizeof (struct GNUNET_GNS_ClientGetAuthMessage))
 748   {
 749     GNUNET_break_op (0);
 750     GNUNET_SERVER_receive_done (client, GNUNET_OK);
 751     return;
 752   }
 753
 754   GNUNET_SERVER_notification_context_add (nc, client);
 755
 756   struct GNUNET_GNS_ClientGetAuthMessage *sh_msg =
 757     (struct GNUNET_GNS_ClientGetAuthMessage *) message;
 758
 759   msg_size = ntohs(message->size);
 760
 761   if (msg_size > GNUNET_SERVER_MAX_MESSAGE_SIZE)
 762   {
 763     GNUNET_break_op (0);
 764     GNUNET_SERVER_receive_done (client, GNUNET_OK);
 765     return;
 766   }
 767
 768   GNUNET_STRINGS_utf8_tolower((char*)&sh_msg[1], &nameptr);
 769
 770
 771   cah = GNUNET_malloc(sizeof(struct ClientGetAuthHandle));
 772   cah->client = client;
 773   cah->unique_id = sh_msg->id;
 774
 775   if (strlen(name) < strlen(GNUNET_GNS_TLD))
 776   {
 777     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 778                 "GET_AUTH: %s is too short. Returning\n", name);
 779     cah->name = NULL;
 780     send_get_auth_response(cah, name);
 781     return;
 782   }
 783
 784   if (strlen (name) > MAX_DNS_NAME_LENGTH) {
 785     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 786                "GET_AUTH: %s is too long", name);
 787     cah->name = NULL;
 788     send_get_auth_response(cah, name);
 789     return;
 790   }
 791
 792   if (strcmp(name+strlen(name)-strlen(GNUNET_GNS_TLD),
 793              GNUNET_GNS_TLD) != 0)
 794   {
 795     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 796                 "GET_AUTH: %s is not our domain. Returning\n", name);
 797     cah->name = NULL;
 798     send_get_auth_response(cah, name);
 799     return;
 800   }
 801
 802   if (strcmp(name, GNUNET_GNS_TLD) == 0)
 803   {
 804     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 805                 "GET_AUTH: %s is us. Returning\n", name);
 806     cah->name = NULL;
 807     send_get_auth_response(cah, name);
 808     return;
 809   }
 810
 811   cah->name = GNUNET_malloc(strlen(name)
 812                             - strlen(GNUNET_GNS_TLD) + 1);
 813   memset(cah->name, 0,
 814          strlen(name)-strlen(GNUNET_GNS_TLD) + 1);
 815   memcpy(cah->name, name,
 816          strlen(name)-strlen(GNUNET_GNS_TLD));
 817
 818   /* Start delegation resolution in our namestore */
 819   gns_resolver_get_authority(zone_hash, zone_hash, name, &send_get_auth_response, cah);
 820 }
 821
 822
 823
 824 /**
 825  * Reply to client with the result from our lookup.
 826  *
 827  * @param cls the closure (our client lookup handle)
 828  * @param rd_count the number of records
 829  * @param rd the record data
 830  */
 831 static void
 832 send_lookup_response(void* cls,
 833                      uint32_t rd_count,
 834                      const struct GNUNET_NAMESTORE_RecordData *rd)
 835 {
 836   struct ClientLookupHandle* clh = (struct ClientLookupHandle*)cls;
 837   struct GNUNET_GNS_ClientLookupResultMessage *rmsg;
 838   size_t len;
 839
 840   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending `%s' message with %d results\n",
 841               "LOOKUP_RESULT", rd_count);
 842
 843   len = GNUNET_NAMESTORE_records_get_size (rd_count, rd);
 844   rmsg = GNUNET_malloc(len+sizeof(struct GNUNET_GNS_ClientLookupResultMessage));
 845
 846   rmsg->id = clh->unique_id;
 847   rmsg->rd_count = htonl(rd_count);
 848   rmsg->header.type = htons(GNUNET_MESSAGE_TYPE_GNS_LOOKUP_RESULT);
 849   rmsg->header.size =
 850     htons(len+sizeof(struct GNUNET_GNS_ClientLookupResultMessage));
 851
 852   GNUNET_NAMESTORE_records_serialize (rd_count, rd, len, (char*)&rmsg[1]);
 853
 854   GNUNET_SERVER_notification_context_unicast (nc, clh->client,
 855                                 (const struct GNUNET_MessageHeader *) rmsg,
 856                                 GNUNET_NO);
 857   GNUNET_SERVER_receive_done (clh->client, GNUNET_OK);
 858
 859   GNUNET_free(rmsg);
 860   GNUNET_free(clh->name);
 861
 862   if (NULL != clh->shorten_key)
 863     GNUNET_free(clh->shorten_key);
 864
 865   GNUNET_free(clh);
 866
 867 }
 868
 869
 870 /**
 871  * Handle lookup requests from client
 872  *
 873  * @param cls the closure
 874  * @param client the client
 875  * @param message the message
 876  */
 877 static void
 878 handle_lookup(void *cls,
 879               struct GNUNET_SERVER_Client * client,
 880               const struct GNUNET_MessageHeader * message)
 881 {
 882   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' message\n", "LOOKUP");
 883
 884   size_t msg_size = 0;
 885   size_t namelen;
 886   char name[MAX_DNS_NAME_LENGTH];
 887   struct ClientLookupHandle *clh;
 888   char* nameptr = name;
 889   int only_cached;
 890   struct GNUNET_CRYPTO_RsaPrivateKey *key;
 891   struct GNUNET_CRYPTO_RsaPrivateKeyBinaryEncoded *pkey;
 892   char* tmp_pkey;
 893
 894   if (ntohs (message->size) < sizeof (struct GNUNET_GNS_ClientLookupMessage))
 895   {
 896     GNUNET_break_op (0);
 897     GNUNET_SERVER_receive_done (client, GNUNET_OK);
 898     return;
 899   }
 900
 901   GNUNET_SERVER_notification_context_add (nc, client);
 902
 903   struct GNUNET_GNS_ClientLookupMessage *sh_msg =
 904     (struct GNUNET_GNS_ClientLookupMessage *) message;
 905
 906   msg_size = ntohs(message->size);
 907
 908   if (msg_size > GNUNET_SERVER_MAX_MESSAGE_SIZE)
 909   {
 910     GNUNET_break_op (0);
 911     GNUNET_SERVER_receive_done (client, GNUNET_OK);
 912     return;
 913   }
 914
 915   if (1 == ntohl(sh_msg->have_key))
 916   {
 917     pkey = (struct GNUNET_CRYPTO_RsaPrivateKeyBinaryEncoded *)&sh_msg[1];
 918     tmp_pkey = (char*)&sh_msg[1];
 919     key = GNUNET_CRYPTO_rsa_decode_key (tmp_pkey, ntohs(pkey->len));
 920     GNUNET_STRINGS_utf8_tolower(&tmp_pkey[ntohs(pkey->len)], &nameptr);
 921   }
 922   else
 923   {
 924     key = NULL;
 925     GNUNET_STRINGS_utf8_tolower((char*)&sh_msg[1], &nameptr);
 926   }
 927
 928   namelen = strlen(name)+1;
 929   clh = GNUNET_malloc(sizeof(struct ClientLookupHandle));
 930   clh->client = client;
 931   clh->name = GNUNET_malloc(namelen);
 932   strcpy(clh->name, name);
 933   clh->unique_id = sh_msg->id;
 934   clh->type = ntohl(sh_msg->type);
 935   clh->shorten_key = key;
 936
 937   only_cached = ntohl(sh_msg->only_cached);
 938
 939   if (strlen (name) > MAX_DNS_NAME_LENGTH) {
 940     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 941                "LOOKUP: %s is too long", name);
 942     clh->name = NULL;
 943     send_lookup_response(clh, 0, NULL);
 944     return;
 945   }
 946
 947   if (1 == ntohl(sh_msg->use_default_zone))
 948     clh->zone = zone_hash; //Default zone
 949   else
 950     clh->zone = sh_msg->zone;
 951
 952   if (GNUNET_YES == auto_import_pkey)
 953   {
 954     gns_resolver_lookup_record (clh->zone, clh->zone, clh->type, clh->name,
 955                                 clh->shorten_key,
 956                                 default_lookup_timeout,
 957                                 clh->only_cached,
 958                                 &send_lookup_response, clh);
 959   }
 960   else
 961   {
 962     gns_resolver_lookup_record (clh->zone, clh->zone, clh->type, name,
 963                                 NULL,
 964                                 default_lookup_timeout,
 965                                 only_cached,
 966                                 &send_lookup_response, clh);
 967   }
 968 }
 969
 970
 971
 972 /**
 973  * Process GNS requests.
 974  *
 975  * @param cls closure)
 976  * @param server the initialized server
 977  * @param c configuration to use
 978  */
 979 static void
 980 run (void *cls, struct GNUNET_SERVER_Handle *server,
 981      const struct GNUNET_CONFIGURATION_Handle *c)
 982 {
 983
 984   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Initializing GNS\n");
 985
 986   char* keyfile;
 987   struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pkey;
 988   unsigned long long max_parallel_bg_queries = 0;
 989   unsigned long long default_lookup_timeout_secs = 0;
 990   int ignore_pending = GNUNET_NO;
 991
 992   static const struct GNUNET_SERVER_MessageHandler handlers[] = {
 993     {&handle_shorten, NULL, GNUNET_MESSAGE_TYPE_GNS_SHORTEN, 0},
 994     {&handle_lookup, NULL, GNUNET_MESSAGE_TYPE_GNS_LOOKUP, 0},
 995     {&handle_get_authority, NULL, GNUNET_MESSAGE_TYPE_GNS_GET_AUTH, 0}
 996   };
 997
 998   GNS_cfg = c;
 999
1000   if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (c, "gns",
1001                                              "ZONEKEY", &keyfile))
1002   {
1003     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1004                 "No private key for root zone specified!\n");
1005     GNUNET_SCHEDULER_shutdown ();
1006     return;
1007   }
1008
1009   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
1010              "Using keyfile %s for root zone.\n", keyfile);
1011
1012   zone_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
1013   GNUNET_CRYPTO_rsa_key_get_public (zone_key, &pkey);
1014
1015   GNUNET_CRYPTO_short_hash(&pkey,
1016                      sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
1017                      &zone_hash);
1018   GNUNET_free(keyfile);
1019
1020   /**
1021    * handle to our local namestore
1022    */
1023   namestore_handle = GNUNET_NAMESTORE_connect(c);
1024
1025   if (NULL == namestore_handle)
1026   {
1027     //FIXME do error handling;
1028     GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
1029                "Failed to connect to the namestore!\n");
1030     GNUNET_SCHEDULER_shutdown ();
1031     return;
1032   }
1033
1034
1035
1036   auto_import_pkey = GNUNET_NO;
1037
1038   if (GNUNET_YES ==
1039       GNUNET_CONFIGURATION_get_value_yesno (c, "gns",
1040                                             "AUTO_IMPORT_PKEY"))
1041   {
1042     GNUNET_log(GNUNET_ERROR_TYPE_INFO,
1043                "Automatic PKEY import is enabled.\n");
1044     auto_import_pkey = GNUNET_YES;
1045
1046   }
1047
1048   if (GNUNET_OK == GNUNET_CONFIGURATION_get_value_string (c, "gns",
1049                                                           "PRIVATE_ZONE",
1050                                                           &private_zone_id))
1051   {
1052     GNUNET_log(GNUNET_ERROR_TYPE_INFO,
1053                "Private zone id: %s\n", private_zone_id);
1054   }
1055
1056   if (GNUNET_OK == GNUNET_CONFIGURATION_get_value_string (c, "gns",
1057                                                           "SHORTEN_ZONE",
1058                                                           &shorten_zone_id))
1059   {
1060     GNUNET_log(GNUNET_ERROR_TYPE_INFO,
1061                "Shorten zone id: %s\n", shorten_zone_id);
1062   }
1063
1064   dht_max_update_interval = GNUNET_GNS_DHT_MAX_UPDATE_INTERVAL;
1065
1066   if (GNUNET_OK ==
1067       GNUNET_CONFIGURATION_get_value_number (c, "gns",
1068                                              "ZONE_PUT_INTERVAL",
1069                                              &dht_max_update_interval))
1070   {
1071     GNUNET_log(GNUNET_ERROR_TYPE_INFO,
1072                "DHT zone update interval: %d\n",
1073                dht_max_update_interval);
1074   }
1075
1076   max_record_put_interval = 1;
1077
1078   if (GNUNET_OK ==
1079       GNUNET_CONFIGURATION_get_value_number (c, "gns",
1080                                              "RECORD_PUT_INTERVAL",
1081                                              &max_record_put_interval))
1082   {
1083     GNUNET_log(GNUNET_ERROR_TYPE_INFO,
1084                "Record put interval: %d\n",
1085                max_record_put_interval);
1086   }
1087
1088   if (GNUNET_OK ==
1089       GNUNET_CONFIGURATION_get_value_number (c, "gns",
1090                                             "MAX_PARALLEL_BACKGROUND_QUERIES",
1091                                             &max_parallel_bg_queries))
1092   {
1093     GNUNET_log(GNUNET_ERROR_TYPE_INFO,
1094                "Number of allowed parallel background queries: %d\n",
1095                max_parallel_bg_queries);
1096   }
1097
1098   if (GNUNET_YES ==
1099       GNUNET_CONFIGURATION_get_value_yesno (c, "gns",
1100                                             "AUTO_IMPORT_CONFIRMATION_REQ"))
1101   {
1102     GNUNET_log(GNUNET_ERROR_TYPE_INFO,
1103                "Auto import requires user confirmation\n");
1104     ignore_pending = GNUNET_YES;
1105   }
1106
1107   if (GNUNET_OK ==
1108       GNUNET_CONFIGURATION_get_value_number(c, "gns",
1109                                             "DEFAULT_LOOKUP_TIMEOUT",
1110                                             &default_lookup_timeout_secs))
1111   {
1112     GNUNET_log(GNUNET_ERROR_TYPE_INFO,
1113                "Default lookup timeout: %ds\n", default_lookup_timeout_secs);
1114     default_lookup_timeout = GNUNET_TIME_relative_multiply(
1115                                             GNUNET_TIME_UNIT_SECONDS,
1116                                             default_lookup_timeout_secs);
1117   }
1118
1119   /**
1120    * handle to the dht
1121    */
1122   dht_handle = GNUNET_DHT_connect(c,
1123                        //max_parallel_bg_queries); //FIXME get ht_len from cfg
1124                        1024);
1125
1126   if (NULL == dht_handle)
1127   {
1128     GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Could not connect to DHT!\n");
1129   }
1130
1131   if (gns_resolver_init(namestore_handle, dht_handle, zone_hash, c,
1132                         max_parallel_bg_queries,
1133                         ignore_pending)
1134       == GNUNET_SYSERR)
1135   {
1136     GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
1137                "Unable to initialize resolver!\n");
1138     GNUNET_SCHEDULER_add_now (&shutdown_task, NULL);
1139     return;
1140   }
1141
1142   if (GNUNET_YES ==
1143       GNUNET_CONFIGURATION_get_value_yesno (c, "gns", "HIJACK_DNS"))
1144   {
1145     GNUNET_log(GNUNET_ERROR_TYPE_INFO,
1146                "DNS hijacking enabled... connecting to service.\n");
1147
1148     if (gns_interceptor_init(zone_hash, zone_key, c) == GNUNET_SYSERR)
1149     {
1150       GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
1151                "Failed to enable the dns interceptor!\n");
1152     }
1153   }
1154
1155   /**
1156    * Schedule periodic put
1157    * for our records
1158    * We have roughly an hour for all records;
1159    */
1160   record_put_interval = GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS,
1161                                                       1);
1162   zone_update_taskid = GNUNET_SCHEDULER_add_now (&update_zone_dht_start, NULL);
1163
1164   GNUNET_SERVER_add_handlers (server, handlers);
1165
1166   //FIXME
1167   //GNUNET_SERVER_disconnect_notify (server,
1168   //                                 &client_disconnect_notification,
1169   //                                 NULL);
1170
1171   nc = GNUNET_SERVER_notification_context_create (server, 1);
1172
1173   GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
1174                                 NULL);
1175 }
1176
1177
1178 /**
1179  * The main function for the GNS service.
1180  *
1181  * @param argc number of arguments from the command line
1182  * @param argv command line arguments
1183  * @return 0 ok, 1 on error
1184  */
1185 int
1186 main (int argc, char *const *argv)
1187 {
1188   int ret;
1189
1190   ret =
1191       (GNUNET_OK ==
1192        GNUNET_SERVICE_run (argc, argv, "gns", GNUNET_SERVICE_OPTION_NONE, &run,
1193                            NULL)) ? 0 : 1;
1194   return ret;
1195 }
1196
1197 /* end of gnunet-service-gns.c */