src/vpn/gnunet-service-dns.c

   1 /*
   2      This file is part of GNUnet.
   3      (C) 2009 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  * @file vpn/gnunet-service-dns.c
  23  * @author Philipp Toelke
  24  */
  25 #include "platform.h"
  26 #include "gnunet_getopt_lib.h"
  27 #include "gnunet_service_lib.h"
  28 #include "gnunet_network_lib.h"
  29 #include "gnunet_os_lib.h"
  30 #include "gnunet-service-dns-p.h"
  31 #include "gnunet_protocols.h"
  32 #include "gnunet_applications.h"
  33 #include "gnunet-vpn-packet.h"
  34 #include "gnunet_container_lib.h"
  35 #include "gnunet-dns-parser.h"
  36 #include "gnunet_dht_service.h"
  37 #include "gnunet_block_lib.h"
  38 #include "block_dns.h"
  39 #include "gnunet_crypto_lib.h"
  40 #include "gnunet_mesh_service.h"
  41 #include "gnunet_signatures.h"
  42
  43 struct GNUNET_MESH_Handle *mesh_handle;
  44
  45 /**
  46  * The UDP-Socket through which DNS-Resolves will be sent if they are not to be
  47  * sent through gnunet. The port of this socket will not be hijacked.
  48  */
  49 static struct GNUNET_NETWORK_Handle *dnsout;
  50
  51 /**
  52  * The port bound to the socket dnsout
  53  */
  54 static unsigned short dnsoutport;
  55
  56 /**
  57  * A handle to the DHT-Service
  58  */
  59 static struct GNUNET_DHT_Handle *dht;
  60
  61 /**
  62  * The configuration to use
  63  */
  64 static const struct GNUNET_CONFIGURATION_Handle *cfg;
  65
  66 /**
  67  * A list of DNS-Responses that have to be sent to the requesting client
  68  */
  69 static struct answer_packet_list *head;
  70
  71 /**
  72  * The tail of the list of DNS-responses
  73  */
  74 static struct answer_packet_list *tail;
  75
  76 /**
  77  * A structure containing a mapping from network-byte-ordered DNS-id (16 bit) to
  78  * some information needed to handle this query
  79  *
  80  * It currently allocates at least
  81  * (1 + machine-width + machine-width + 32 + 32 + 16 + machine-width + 8) * 65536 bit
  82  * = 17 MiB on 64 bit.
  83  * = 11 MiB on 32 bit.
  84  */
  85 static struct {
  86     unsigned valid:1;
  87     struct GNUNET_SERVER_Client* client;
  88     struct GNUNET_MESH_Tunnel *tunnel;
  89     uint32_t local_ip;
  90     uint32_t remote_ip;
  91     uint16_t local_port;
  92     char* name;
  93     uint8_t namelen;
  94 } query_states[UINT16_MAX];
  95
  96 /**
  97  * A struct used to give more than one value as
  98  * closure to receive_dht
  99  */
 100 struct receive_dht_cls {
 101     uint16_t id;
 102     struct GNUNET_DHT_GetHandle* handle;
 103 };
 104
 105 /**
 106  * Hijack all outgoing DNS-Traffic but for traffic leaving "our" port.
 107  */
 108 static void
 109 hijack (void *cls __attribute__((unused)), const struct GNUNET_SCHEDULER_TaskContext *tc)
 110 {
 111   if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
 112     return;
 113
 114   char port_s[6];
 115   char *virt_dns;
 116   struct GNUNET_OS_Process *proc;
 117
 118   if (GNUNET_SYSERR ==
 119       GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "VIRTDNS",
 120                                              &virt_dns))
 121     {
 122       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 123                   "No entry 'VIRTDNS' in configuration!\n");
 124       exit (1);
 125     }
 126
 127   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Hijacking, port is %d\n", dnsoutport);
 128   snprintf (port_s, 6, "%d", dnsoutport);
 129   if (NULL != (proc = GNUNET_OS_start_process (NULL,
 130                                                NULL,
 131                                                "gnunet-helper-hijack-dns",
 132                                                "gnunet-hijack-dns",
 133                                                port_s, virt_dns, NULL)))
 134     GNUNET_OS_process_close (proc);
 135   GNUNET_free (virt_dns);
 136 }
 137
 138 /**
 139  * Delete the hijacking-routes
 140  */
 141 static void
 142 unhijack (unsigned short port)
 143 {
 144   char port_s[6];
 145   char *virt_dns;
 146   struct GNUNET_OS_Process *proc;
 147
 148   if (GNUNET_SYSERR ==
 149       GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "VIRTDNS",
 150                                              &virt_dns))
 151     {
 152       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 153                   "No entry 'VIRTDNS' in configuration!\n");
 154       exit (1);
 155     }
 156
 157   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "unHijacking, port is %d\n", port);
 158   snprintf (port_s, 6, "%d", port);
 159   if (NULL != (proc = GNUNET_OS_start_process (NULL,
 160                                                NULL,
 161                                                "gnunet-helper-hijack-dns",
 162                                                "gnunet-hijack-dns",
 163                                                "-d", port_s, virt_dns, NULL)))
 164     GNUNET_OS_process_close (proc);
 165   GNUNET_free (virt_dns);
 166 }
 167
 168 /**
 169  * Send the DNS-Response to the client. Gets called via the notify_transmit_ready-
 170  * system.
 171  */
 172 static size_t
 173 send_answer(void* cls, size_t size, void* buf) {
 174     struct answer_packet_list* query = head;
 175     size_t len = ntohs(query->pkt.hdr.size);
 176
 177     GNUNET_assert(len <= size);
 178
 179     memcpy(buf, &query->pkt.hdr, len);
 180
 181     GNUNET_CONTAINER_DLL_remove (head, tail, query);
 182
 183     GNUNET_free(query);
 184
 185     /* When more data is to be sent, reschedule */
 186     if (head != NULL)
 187       GNUNET_SERVER_notify_transmit_ready(cls,
 188                                           ntohs(head->pkt.hdr.size),
 189                                           GNUNET_TIME_UNIT_FOREVER_REL,
 190                                           &send_answer,
 191                                           cls);
 192
 193     return len;
 194 }
 195
 196 struct tunnel_cls {
 197     struct GNUNET_MESH_Tunnel *tunnel GNUNET_PACKED;
 198     struct GNUNET_MessageHeader hdr;
 199     struct dns_pkt dns;
 200 };
 201
 202 struct tunnel_cls *remote_pending[UINT16_MAX];
 203
 204 static size_t
 205 mesh_send_response (void *cls, size_t size, void *buf)
 206 {
 207   GNUNET_assert (size >= sizeof (struct GNUNET_MessageHeader));
 208   struct GNUNET_MessageHeader *hdr = buf;
 209   uint32_t *sz = cls;
 210   struct dns_pkt *dns = (struct dns_pkt *) (sz + 1);
 211   hdr->type = htons (GNUNET_MESSAGE_TYPE_REMOTE_ANSWER_DNS);
 212   hdr->size = htons (*sz + sizeof (struct GNUNET_MessageHeader));
 213
 214   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 215               "Sending response, size=%d, sz=%d, sz+hdr=%d\n", size, *sz,
 216               *sz + sizeof (struct GNUNET_MessageHeader));
 217
 218   GNUNET_assert (size >= (*sz + sizeof (struct GNUNET_MessageHeader)));
 219
 220   memcpy (hdr + 1, dns, *sz);
 221   GNUNET_free (cls);
 222   return ntohs (hdr->size);
 223 }
 224
 225 static size_t
 226 mesh_send (void *cls, size_t size, void *buf)
 227 {
 228   struct tunnel_cls *cls_ = (struct tunnel_cls *) cls;
 229
 230   GNUNET_assert(cls_->hdr.size <= size);
 231
 232   size = cls_->hdr.size;
 233   cls_->hdr.size = htons(cls_->hdr.size);
 234
 235   memcpy(buf, &cls_->hdr, size);
 236   return size;
 237 }
 238
 239
 240 void mesh_connect (void* cls, const struct GNUNET_PeerIdentity* peer, const struct GNUNET_TRANSPORT_ATS_Information *atsi __attribute__((unused))) {
 241   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Connected to peer %x\n", *((unsigned long*)peer));
 242   struct tunnel_cls *cls_ = (struct tunnel_cls*)cls;
 243
 244   GNUNET_MESH_notify_transmit_ready(cls_->tunnel,
 245                                     GNUNET_YES,
 246                                     42,
 247                                     GNUNET_TIME_UNIT_MINUTES,
 248                                     NULL,
 249                                     cls_->hdr.size,
 250                                     mesh_send,
 251                                     cls);
 252 }
 253
 254
 255 static void
 256 send_mesh_query (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
 257 {
 258   if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
 259     return;
 260
 261   struct tunnel_cls *cls_ = (struct tunnel_cls*)cls;
 262
 263   cls_->tunnel = GNUNET_MESH_peer_request_connect_by_type(mesh_handle,
 264                                            GNUNET_TIME_UNIT_HOURS,
 265                                            GNUNET_APPLICATION_TYPE_INTERNET_RESOLVER,
 266                                            mesh_connect,
 267                                            NULL,
 268                                            cls_);
 269
 270   remote_pending[cls_->dns.s.id] = cls_;
 271 }
 272
 273 static int
 274 receive_mesh_query (void *cls __attribute__((unused)),
 275                     struct GNUNET_MESH_Tunnel *tunnel,
 276                     void **ctx __attribute__((unused)),
 277                     const struct GNUNET_PeerIdentity *sender __attribute__((unused)),
 278                     const struct GNUNET_MessageHeader *message,
 279                     const struct GNUNET_TRANSPORT_ATS_Information *atsi __attribute__((unused)))
 280 {
 281   struct dns_pkt *dns = (struct dns_pkt*)(message + 1);
 282
 283   struct sockaddr_in dest;
 284   memset(&dest, 0, sizeof dest);
 285   dest.sin_port = htons(53);
 286   /* TODO: read from config */
 287   inet_pton(AF_INET, "8.8.8.8", &dest.sin_addr);
 288
 289   query_states[dns->s.id].tunnel = tunnel;
 290   query_states[dns->s.id].valid = GNUNET_YES;
 291
 292   GNUNET_NETWORK_socket_sendto(dnsout,
 293                                dns,
 294                                ntohs(message->size) - sizeof(struct GNUNET_MessageHeader),
 295                                (struct sockaddr*) &dest,
 296                                sizeof dest);
 297
 298   return GNUNET_SYSERR;
 299 }
 300
 301 static int
 302 receive_mesh_answer (void *cls __attribute__((unused)),
 303                      struct GNUNET_MESH_Tunnel *tunnel,
 304                      void **ctx __attribute__((unused)),
 305                      const struct GNUNET_PeerIdentity *sender __attribute__((unused)),
 306                      const struct GNUNET_MessageHeader *message,
 307                      const struct GNUNET_TRANSPORT_ATS_Information *atsi __attribute__((unused)))
 308 {
 309   /* TODo: size check */
 310   struct dns_pkt *dns = (struct dns_pkt *) (message + 1);
 311
 312   /* They sent us a packet we were not waiting for */
 313   if (remote_pending[dns->s.id] == NULL
 314       || remote_pending[dns->s.id]->tunnel != tunnel)
 315     return GNUNET_SYSERR;
 316   if (query_states[dns->s.id].valid != GNUNET_YES)
 317     return GNUNET_SYSERR;
 318   query_states[dns->s.id].valid = GNUNET_NO;
 319
 320   size_t len = sizeof (struct answer_packet) - 1 + sizeof (struct dns_static) + query_states[dns->s.id].namelen + sizeof (struct dns_query_line) + 2    /* To hold the pointer (as defined in RFC1035) to the name */
 321     + sizeof (struct dns_record_line) - 1 + 16; /* To hold the IPv6-Address */
 322
 323   struct answer_packet_list *answer =
 324     GNUNET_malloc (len + 2 * sizeof (struct answer_packet_list *));
 325   memset (answer, 0, len + 2 * sizeof (struct answer_packet_list *));
 326
 327   answer->pkt.hdr.type = htons (GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 328   answer->pkt.hdr.size = htons (len);
 329   answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_REMOTE;
 330
 331   struct dns_pkt_parsed* pdns = parse_dns_packet(dns);
 332
 333   if (ntohs(pdns->s.ancount) < 1)
 334     {
 335       free_parsed_dns_packet(pdns);
 336       return GNUNET_OK;
 337     }
 338
 339   answer->pkt.addrsize = pdns->answers[0]->data_len;
 340   memcpy(answer->pkt.addr, pdns->answers[0]->data, ntohs(pdns->answers[0]->data_len));
 341
 342   answer->pkt.from = query_states[dns->s.id].remote_ip;
 343
 344   answer->pkt.to = query_states[dns->s.id].local_ip;
 345   answer->pkt.dst_port = query_states[dns->s.id].local_port;
 346
 347   struct dns_pkt *dpkt = (struct dns_pkt *) answer->pkt.data;
 348
 349   dpkt->s.id = dns->s.id;
 350   dpkt->s.aa = 1;
 351   dpkt->s.qr = 1;
 352   dpkt->s.ra = 1;
 353   dpkt->s.qdcount = htons (1);
 354   dpkt->s.ancount = htons (1);
 355
 356   memcpy (dpkt->data, query_states[dns->s.id].name,
 357           query_states[dns->s.id].namelen);
 358   GNUNET_free (query_states[dns->s.id].name);
 359
 360   struct dns_query_line *dque =
 361     (struct dns_query_line *) (dpkt->data +
 362                                (query_states[dns->s.id].namelen));
 363   dque->type = htons (28);      /* AAAA */
 364   dque->class = htons (1);      /* IN */
 365
 366   char *anname =
 367     (char *) (dpkt->data + (query_states[dns->s.id].namelen) +
 368               sizeof (struct dns_query_line));
 369   memcpy (anname, "\xc0\x0c", 2);
 370
 371   struct dns_record_line *drec_data =
 372     (struct dns_record_line *) (dpkt->data +
 373                                 (query_states[dns->s.id].namelen) +
 374                                 sizeof (struct dns_query_line) + 2);
 375   drec_data->type = htons (28); /* AAAA */
 376   drec_data->class = htons (1); /* IN */
 377
 378   drec_data->ttl = pdns->answers[0]->ttl;
 379   drec_data->data_len = htons (16);
 380
 381   /* Calculate at which offset in the packet the IPv6-Address belongs, it is
 382    * filled in by the daemon-vpn */
 383   answer->pkt.addroffset =
 384     htons ((unsigned short) ((unsigned long) (&drec_data->data) -
 385                              (unsigned long) (&answer->pkt)));
 386
 387   GNUNET_CONTAINER_DLL_insert_after (head, tail, tail, answer);
 388
 389   GNUNET_SERVER_notify_transmit_ready (query_states[dns->s.id].client,
 390                                        len,
 391                                        GNUNET_TIME_UNIT_FOREVER_REL,
 392                                        &send_answer,
 393                                        query_states[dns->s.id].client);
 394
 395   free_parsed_dns_packet(pdns);
 396   return GNUNET_OK;
 397 }
 398
 399
 400 static void
 401 send_rev_query(void * cls, const struct GNUNET_SCHEDULER_TaskContext *tc) {
 402     if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
 403       return;
 404
 405     struct dns_pkt_parsed* pdns = (struct dns_pkt_parsed*) cls;
 406
 407     unsigned short id = pdns->s.id;
 408
 409     free_parsed_dns_packet(pdns);
 410
 411     if (query_states[id].valid != GNUNET_YES) return;
 412     query_states[id].valid = GNUNET_NO;
 413
 414     GNUNET_assert(query_states[id].namelen == 74);
 415
 416     size_t len = sizeof(struct answer_packet) - 1 \
 417                  + sizeof(struct dns_static) \
 418                  + 74 /* this is the length of a reverse ipv6-lookup */ \
 419                  + sizeof(struct dns_query_line) \
 420                  + 2 /* To hold the pointer (as defined in RFC1035) to the name */ \
 421                  + sizeof(struct dns_record_line) - 1 \
 422                  - 2 /* We do not know the lenght of the answer yet*/;
 423
 424     struct answer_packet_list* answer = GNUNET_malloc(len + 2*sizeof(struct answer_packet_list*));
 425     memset(answer, 0, len + 2*sizeof(struct answer_packet_list*));
 426
 427     answer->pkt.hdr.type = htons(GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 428     answer->pkt.hdr.size = htons(len);
 429     answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_REV;
 430
 431     answer->pkt.from = query_states[id].remote_ip;
 432
 433     answer->pkt.to = query_states[id].local_ip;
 434     answer->pkt.dst_port = query_states[id].local_port;
 435
 436     struct dns_pkt *dpkt = (struct dns_pkt*)answer->pkt.data;
 437
 438     dpkt->s.id = id;
 439     dpkt->s.aa = 1;
 440     dpkt->s.qr = 1;
 441     dpkt->s.ra = 1;
 442     dpkt->s.qdcount = htons(1);
 443     dpkt->s.ancount = htons(1);
 444
 445     memcpy(dpkt->data, query_states[id].name, query_states[id].namelen);
 446     GNUNET_free(query_states[id].name);
 447
 448     struct dns_query_line* dque = (struct dns_query_line*)(dpkt->data+(query_states[id].namelen));
 449     dque->type = htons(12); /* PTR */
 450     dque->class = htons(1); /* IN */
 451
 452     char* anname = (char*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line));
 453     memcpy(anname, "\xc0\x0c", 2);
 454
 455     struct dns_record_line *drec_data = (struct dns_record_line*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line)+2);
 456     drec_data->type = htons(12); /* AAAA */
 457     drec_data->class = htons(1); /* IN */
 458     /* FIXME: read the TTL from block:
 459      * GNUNET_TIME_absolute_get_remaining(rec->expiration_time)
 460      *
 461      * But how to get the seconds out of this?
 462      */
 463     drec_data->ttl = htonl(3600);
 464
 465     /* Calculate at which offset in the packet the length of the name and the
 466      * name, it is filled in by the daemon-vpn */
 467     answer->pkt.addroffset = htons((unsigned short)((unsigned long)(&drec_data->data_len)-(unsigned long)(&answer->pkt)));
 468
 469     GNUNET_CONTAINER_DLL_insert_after(head, tail, tail, answer);
 470
 471     GNUNET_SERVER_notify_transmit_ready(query_states[id].client,
 472                                         len,
 473                                         GNUNET_TIME_UNIT_FOREVER_REL,
 474                                         &send_answer,
 475                                         query_states[id].client);
 476 }
 477
 478 /**
 479  * Receive a block from the dht.
 480  */
 481 static void
 482 receive_dht(void *cls,
 483             struct GNUNET_TIME_Absolute exp __attribute__((unused)),
 484             const GNUNET_HashCode *key __attribute__((unused)),
 485             const struct GNUNET_PeerIdentity *const *get_path __attribute__((unused)),
 486             const struct GNUNET_PeerIdentity *const *put_path __attribute__((unused)),
 487             enum GNUNET_BLOCK_Type type,
 488             size_t size,
 489             const void *data) {
 490
 491     unsigned short id = ((struct receive_dht_cls*)cls)->id;
 492     struct GNUNET_DHT_GetHandle* handle = ((struct receive_dht_cls*)cls)->handle;
 493     GNUNET_free(cls);
 494
 495     GNUNET_assert(type == GNUNET_BLOCK_TYPE_DNS);
 496
 497     /* If no query with this id is pending, ignore the block */
 498     if (query_states[id].valid != GNUNET_YES) return;
 499     query_states[id].valid = GNUNET_NO;
 500
 501     const struct GNUNET_DNS_Record* rec = data;
 502     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 503                "Got block of size %d, peer: %08x, desc: %08x\n",
 504                size,
 505                *((unsigned int*)&rec->peer),
 506                *((unsigned int*)&rec->service_descriptor));
 507
 508     size_t len = sizeof(struct answer_packet) - 1 \
 509                  + sizeof(struct dns_static) \
 510                  + query_states[id].namelen \
 511                  + sizeof(struct dns_query_line) \
 512                  + 2 /* To hold the pointer (as defined in RFC1035) to the name */ \
 513                  + sizeof(struct dns_record_line) - 1 \
 514                  + 16; /* To hold the IPv6-Address */
 515
 516     struct answer_packet_list* answer = GNUNET_malloc(len + 2*sizeof(struct answer_packet_list*));
 517     memset(answer, 0, len + 2*sizeof(struct answer_packet_list*));
 518
 519     answer->pkt.hdr.type = htons(GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 520     answer->pkt.hdr.size = htons(len);
 521     answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_SERVICE;
 522
 523     GNUNET_CRYPTO_hash(&rec->peer,
 524                        sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
 525                        &answer->pkt.service_descr.peer);
 526
 527     memcpy(&answer->pkt.service_descr.service_descriptor,
 528            &rec->service_descriptor,
 529            sizeof(GNUNET_HashCode));
 530     memcpy(&answer->pkt.service_descr.service_type,
 531            &rec->service_type,
 532            sizeof(answer->pkt.service_descr.service_type));
 533     memcpy(&answer->pkt.service_descr.ports, &rec->ports, sizeof(answer->pkt.service_descr.ports));
 534
 535     answer->pkt.from = query_states[id].remote_ip;
 536
 537     answer->pkt.to = query_states[id].local_ip;
 538     answer->pkt.dst_port = query_states[id].local_port;
 539
 540     struct dns_pkt *dpkt = (struct dns_pkt*)answer->pkt.data;
 541
 542     dpkt->s.id = id;
 543     dpkt->s.aa = 1;
 544     dpkt->s.qr = 1;
 545     dpkt->s.ra = 1;
 546     dpkt->s.qdcount = htons(1);
 547     dpkt->s.ancount = htons(1);
 548
 549     memcpy(dpkt->data, query_states[id].name, query_states[id].namelen);
 550     GNUNET_free(query_states[id].name);
 551
 552     struct dns_query_line* dque = (struct dns_query_line*)(dpkt->data+(query_states[id].namelen));
 553     dque->type = htons(28); /* AAAA */
 554     dque->class = htons(1); /* IN */
 555
 556     char* anname = (char*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line));
 557     memcpy(anname, "\xc0\x0c", 2);
 558
 559     struct dns_record_line *drec_data = (struct dns_record_line*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line)+2);
 560     drec_data->type = htons(28); /* AAAA */
 561     drec_data->class = htons(1); /* IN */
 562
 563     /* FIXME: read the TTL from block:
 564      * GNUNET_TIME_absolute_get_remaining(rec->expiration_time)
 565      *
 566      * But how to get the seconds out of this?
 567      */
 568     drec_data->ttl = htonl(3600);
 569     drec_data->data_len = htons(16);
 570
 571     /* Calculate at which offset in the packet the IPv6-Address belongs, it is
 572      * filled in by the daemon-vpn */
 573     answer->pkt.addroffset = htons((unsigned short)((unsigned long)(&drec_data->data)-(unsigned long)(&answer->pkt)));
 574
 575     GNUNET_CONTAINER_DLL_insert_after(head, tail, tail, answer);
 576
 577     GNUNET_SERVER_notify_transmit_ready(query_states[id].client,
 578                                         len,
 579                                         GNUNET_TIME_UNIT_FOREVER_REL,
 580                                         &send_answer,
 581                                         query_states[id].client);
 582
 583     GNUNET_DHT_get_stop(handle);
 584 }
 585
 586 /**
 587  * This receives a GNUNET_MESSAGE_TYPE_REHIJACK and rehijacks the DNS
 588  */
 589 static void
 590 rehijack(void *cls __attribute__((unused)),
 591          struct GNUNET_SERVER_Client *client,
 592          const struct GNUNET_MessageHeader *message __attribute__((unused))) {
 593     unhijack(dnsoutport);
 594     GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_UNIT_SECONDS, hijack, NULL);
 595
 596     GNUNET_SERVER_receive_done(client, GNUNET_OK);
 597 }
 598
 599 /**
 600  * This receives the dns-payload from the daemon-vpn and sends it on over the udp-socket
 601  */
 602 static void
 603 receive_query(void *cls __attribute__((unused)),
 604               struct GNUNET_SERVER_Client *client,
 605               const struct GNUNET_MessageHeader *message) {
 606     struct query_packet* pkt = (struct query_packet*)message;
 607     struct dns_pkt* dns = (struct dns_pkt*)pkt->data;
 608     struct dns_pkt_parsed* pdns = parse_dns_packet(dns);
 609
 610     query_states[dns->s.id].valid = GNUNET_YES;
 611     query_states[dns->s.id].client = client;
 612     query_states[dns->s.id].local_ip = pkt->orig_from;
 613     query_states[dns->s.id].local_port = pkt->src_port;
 614     query_states[dns->s.id].remote_ip = pkt->orig_to;
 615     query_states[dns->s.id].namelen = strlen((char*)dns->data) + 1;
 616     query_states[dns->s.id].name = GNUNET_malloc(query_states[dns->s.id].namelen);
 617     memcpy(query_states[dns->s.id].name, dns->data, query_states[dns->s.id].namelen);
 618
 619     /* The query is for a .gnunet-address */
 620     if (pdns->queries[0]->namelen > 9 &&
 621         0 == strncmp(pdns->queries[0]->name+(pdns->queries[0]->namelen - 9), ".gnunet.", 9))
 622       {
 623         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Query for .gnunet!\n");
 624         GNUNET_HashCode key;
 625         GNUNET_CRYPTO_hash(pdns->queries[0]->name, pdns->queries[0]->namelen, &key);
 626
 627         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 628                    "Getting with key %08x, len is %d\n",
 629                    *((unsigned int*)&key),
 630                    pdns->queries[0]->namelen);
 631
 632         struct receive_dht_cls* cls = GNUNET_malloc(sizeof(struct receive_dht_cls));
 633         cls->id = dns->s.id;
 634
 635         cls->handle = GNUNET_DHT_get_start(dht,
 636                                            GNUNET_TIME_UNIT_MINUTES,
 637                                            GNUNET_BLOCK_TYPE_DNS,
 638                                            &key,
 639                                            DEFAULT_GET_REPLICATION,
 640                                            GNUNET_DHT_RO_NONE,
 641                                            NULL,
 642                                            0,
 643                                            NULL,
 644                                            0,
 645                                            receive_dht,
 646                                            cls);
 647
 648         goto outfree;
 649       }
 650
 651     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Query for '%s'; namelen=%d\n", pdns->queries[0]->name, pdns->queries[0]->namelen);
 652
 653     /* This is a PTR-Query. Check if it is for "our" network */
 654     if (htons(pdns->queries[0]->qtype) == 12 &&
 655         74 == pdns->queries[0]->namelen)
 656       {
 657         char* ipv6addr;
 658         char ipv6[16];
 659         char ipv6rev[74] = "X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.ip6.arpa.";
 660         unsigned int i;
 661         unsigned long long ipv6prefix;
 662         unsigned int comparelen;
 663
 664         GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_string(cfg, "vpn", "IPV6ADDR", &ipv6addr));
 665         inet_pton (AF_INET6, ipv6addr, ipv6);
 666         GNUNET_free(ipv6addr);
 667
 668         GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_number(cfg, "vpn", "IPV6PREFIX", &ipv6prefix));
 669         GNUNET_assert(ipv6prefix < 127);
 670         ipv6prefix = (ipv6prefix + 7)/8;
 671
 672         for (i = ipv6prefix; i < 16; i++)
 673           ipv6[i] = 0;
 674
 675         for (i = 0; i < 16; i++)
 676           {
 677             unsigned char c1 = ipv6[i] >> 4;
 678             unsigned char c2 = ipv6[i] & 0xf;
 679
 680             if (c1 <= 9)
 681               ipv6rev[62-(4*i)] = c1 + '0';
 682             else
 683               ipv6rev[62-(4*i)] = c1 + 87; /* 87 is the difference between 'a' and 10 */
 684
 685             if (c2 <= 9)
 686               ipv6rev[62-((4*i)+2)] = c2 + '0';
 687             else
 688               ipv6rev[62-((4*i)+2)] = c2 + 87;
 689           }
 690         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "My network is %s'.\n", ipv6rev);
 691         comparelen = 10 + 4*ipv6prefix;
 692         if(0 == strncmp(pdns->queries[0]->name+(pdns->queries[0]->namelen - comparelen),
 693                         ipv6rev + (74 - comparelen),
 694                         comparelen))
 695           {
 696             GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Reverse-Query for .gnunet!\n");
 697
 698             GNUNET_SCHEDULER_add_now(send_rev_query, pdns);
 699
 700             goto out;
 701           }
 702       }
 703
 704     char* virt_dns;
 705     unsigned int virt_dns_bytes;
 706     if (GNUNET_SYSERR ==
 707         GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "VIRTDNS",
 708                                                &virt_dns))
 709       {
 710         GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 711                     "No entry 'VIRTDNS' in configuration!\n");
 712         exit (1);
 713       }
 714
 715     if (1 != inet_pton (AF_INET, virt_dns, &virt_dns_bytes))
 716       {
 717         GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 718                     "Error parsing 'VIRTDNS': %s; %m!\n", virt_dns);
 719         exit(1);
 720       }
 721
 722     GNUNET_free(virt_dns);
 723
 724     if (virt_dns_bytes == pkt->orig_to)
 725       {
 726         /* This is a packet that was sent directly to the virtual dns-server
 727          *
 728          * This means we have to send this query over gnunet
 729          */
 730
 731         size_t size = sizeof(struct GNUNET_MESH_Tunnel*) + sizeof(struct GNUNET_MessageHeader) + (ntohs(message->size) - sizeof(struct query_packet) + 1);
 732         struct tunnel_cls *cls_ =  GNUNET_malloc(size);
 733         cls_->hdr.size = size - sizeof(struct GNUNET_MESH_Tunnel*);
 734
 735         cls_->hdr.type = ntohs(GNUNET_MESSAGE_TYPE_REMOTE_QUERY_DNS);
 736         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "size: %d\n", size);
 737
 738         memcpy(&cls_->dns, dns, cls_->hdr.size - sizeof(struct GNUNET_MessageHeader));
 739         GNUNET_SCHEDULER_add_now(send_mesh_query, cls_);
 740
 741         goto out;
 742       }
 743
 744
 745     /* The query should be sent to the network */
 746
 747     struct sockaddr_in dest;
 748     memset(&dest, 0, sizeof dest);
 749     dest.sin_port = htons(53);
 750     dest.sin_addr.s_addr = pkt->orig_to;
 751
 752     GNUNET_NETWORK_socket_sendto(dnsout,
 753                                  dns,
 754                                  ntohs(pkt->hdr.size) - sizeof(struct query_packet) + 1,
 755                                  (struct sockaddr*) &dest,
 756                                  sizeof dest);
 757
 758 outfree:
 759     free_parsed_dns_packet(pdns);
 760     pdns = NULL;
 761 out:
 762     GNUNET_SERVER_receive_done(client, GNUNET_OK);
 763 }
 764
 765 static void read_response (void *cls,
 766                            const struct GNUNET_SCHEDULER_TaskContext *tc);
 767
 768 static void
 769 open_port ()
 770 {
 771   struct sockaddr_in addr;
 772
 773   dnsout = GNUNET_NETWORK_socket_create (AF_INET, SOCK_DGRAM, 0);
 774   if (dnsout == NULL)
 775     return;
 776   memset (&addr, 0, sizeof (struct sockaddr_in));
 777
 778   int err = GNUNET_NETWORK_socket_bind (dnsout,
 779                                         (struct sockaddr *) &addr,
 780                                         sizeof (struct sockaddr_in));
 781
 782   if (err != GNUNET_YES)
 783     {
 784       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 785                   "Could not bind a port, exiting\n");
 786       return;
 787     }
 788
 789   /* Read the port we bound to */
 790   socklen_t addrlen = sizeof (struct sockaddr_in);
 791   err = getsockname (GNUNET_NETWORK_get_fd (dnsout),
 792                      (struct sockaddr *) &addr, &addrlen);
 793
 794   dnsoutport = htons (addr.sin_port);
 795
 796   GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL, dnsout,
 797                                  &read_response, NULL);
 798 }
 799
 800 /**
 801  * Read a response-packet of the UDP-Socket
 802  */
 803 static void
 804 read_response (void *cls __attribute__((unused)), const struct GNUNET_SCHEDULER_TaskContext *tc)
 805 {
 806   struct sockaddr_in addr;
 807   socklen_t addrlen = sizeof (addr);
 808   int r;
 809   int len;
 810
 811   if (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
 812     return;
 813
 814   memset (&addr, 0, sizeof addr);
 815
 816 #ifndef MINGW
 817   if (0 != ioctl (GNUNET_NETWORK_get_fd (dnsout), FIONREAD, &len))
 818     {
 819       unhijack (dnsoutport);
 820       open_port ();
 821       GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS, hijack, NULL);
 822       return;
 823     }
 824 #else
 825   /* port the code above? */
 826   len = 65536;
 827 #endif
 828   {
 829     unsigned char buf[len];
 830     struct dns_pkt *dns = (struct dns_pkt *) buf;
 831
 832     r = GNUNET_NETWORK_socket_recvfrom (dnsout,
 833                                         buf,
 834                                         sizeof (buf),
 835                                         (struct sockaddr *) &addr, &addrlen);
 836
 837     if (r < 0)
 838       {
 839         unhijack (dnsoutport);
 840         open_port ();
 841         GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS, hijack, NULL);
 842         return;
 843       }
 844
 845     if (query_states[dns->s.id].valid == GNUNET_YES)
 846       {
 847         if (query_states[dns->s.id].tunnel != NULL)
 848           {
 849             uint32_t *c = GNUNET_malloc(4 + r);
 850             *c = r;
 851             memcpy(c+1, dns, r);
 852             GNUNET_MESH_notify_transmit_ready (query_states[dns->s.id].tunnel,
 853                                                GNUNET_YES,
 854                                                32,
 855                                                GNUNET_TIME_UNIT_MINUTES,
 856                                                NULL, r + sizeof(struct GNUNET_MessageHeader), mesh_send_response, c);
 857           }
 858         else
 859           {
 860             query_states[dns->s.id].valid = GNUNET_NO;
 861
 862             size_t len = sizeof (struct answer_packet) + r - 1; /* 1 for the unsigned char data[1]; */
 863             struct answer_packet_list *answer =
 864               GNUNET_malloc (len + 2 * sizeof (struct answer_packet_list *));
 865             answer->pkt.hdr.type =
 866               htons (GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 867             answer->pkt.hdr.size = htons (len);
 868             answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_IP;
 869             answer->pkt.from = addr.sin_addr.s_addr;
 870             answer->pkt.to = query_states[dns->s.id].local_ip;
 871             answer->pkt.dst_port = query_states[dns->s.id].local_port;
 872             memcpy (answer->pkt.data, buf, r);
 873
 874             GNUNET_CONTAINER_DLL_insert_after (head, tail, tail, answer);
 875
 876             GNUNET_SERVER_notify_transmit_ready (query_states[dns->s.id].
 877                                                  client, len,
 878                                                  GNUNET_TIME_UNIT_FOREVER_REL,
 879                                                  &send_answer,
 880                                                  query_states[dns->s.id].
 881                                                  client);
 882           }
 883       }
 884   }
 885   GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
 886                                  dnsout, &read_response, NULL);
 887 }
 888
 889
 890 /**
 891  * Task run during shutdown.
 892  *
 893  * @param cls unused
 894  * @param tc unused
 895  */
 896 static void
 897 cleanup_task (void *cls __attribute__((unused)),
 898               const struct GNUNET_SCHEDULER_TaskContext *tc)
 899 {
 900   GNUNET_assert(0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN));
 901
 902   unhijack(dnsoutport);
 903   GNUNET_DHT_disconnect(dht);
 904 }
 905
 906 /**
 907  * @brief Create a port-map from udp and tcp redirects
 908  *
 909  * @param udp_redirects
 910  * @param tcp_redirects
 911  *
 912  * @return
 913  */
 914 uint64_t
 915 get_port_from_redirects (const char *udp_redirects, const char *tcp_redirects)
 916 {
 917   uint64_t ret = 0;
 918   char* cpy, *hostname, *redirect;
 919   int local_port, count = 0;
 920
 921   if (NULL != udp_redirects)
 922     {
 923       cpy = GNUNET_strdup (udp_redirects);
 924       for (redirect = strtok (cpy, " "); redirect != NULL; redirect = strtok (NULL, " "))
 925         {
 926           if (NULL == (hostname = strstr (redirect, ":")))
 927             {
 928               GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: option %s is not formatted correctly!\n", redirect);
 929               continue;
 930             }
 931           hostname[0] = '\0';
 932           local_port = atoi (redirect);
 933           if (!((local_port > 0) && (local_port < 65536)))
 934             GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: %s is not a correct port.", redirect);
 935
 936           ret |= (0xFFFF & htons(local_port));
 937           ret <<= 16;
 938           count ++;
 939
 940           if(count > 4)
 941             {
 942               ret = 0;
 943               goto out;
 944             }
 945         }
 946       GNUNET_free(cpy);
 947       cpy = NULL;
 948     }
 949
 950   if (NULL != tcp_redirects)
 951     {
 952       cpy = GNUNET_strdup (tcp_redirects);
 953       for (redirect = strtok (cpy, " "); redirect != NULL; redirect = strtok (NULL, " "))
 954         {
 955           if (NULL == (hostname = strstr (redirect, ":")))
 956             {
 957               GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: option %s is not formatted correctly!\n", redirect);
 958               continue;
 959             }
 960           hostname[0] = '\0';
 961           local_port = atoi (redirect);
 962           if (!((local_port > 0) && (local_port < 65536)))
 963             GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: %s is not a correct port.", redirect);
 964
 965           ret |= (0xFFFF & htons(local_port));
 966           ret <<= 16;
 967           count ++;
 968
 969           if(count > 4)
 970             {
 971               ret = 0;
 972               goto out;
 973             }
 974         }
 975       GNUNET_free(cpy);
 976       cpy = NULL;
 977     }
 978
 979 out:
 980   if (NULL != cpy)
 981     GNUNET_free(cpy);
 982   return ret;
 983 }
 984
 985 void
 986 publish_name (const char *name, uint64_t ports, uint32_t service_type,
 987               struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key)
 988 {
 989   size_t size = sizeof (struct GNUNET_DNS_Record);
 990   struct GNUNET_DNS_Record data;
 991   memset (&data, 0, size);
 992
 993   data.purpose.size =
 994     htonl (size - sizeof (struct GNUNET_CRYPTO_RsaSignature));
 995   data.purpose.purpose = GNUNET_SIGNATURE_PURPOSE_DNS_RECORD;
 996
 997   GNUNET_CRYPTO_hash (name, strlen (name) + 1, &data.service_descriptor);
 998   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Store with key1 %x\n",
 999               *((unsigned long long *) &data.service_descriptor));
1000
1001   data.service_type = service_type;
1002   data.ports = ports;
1003
1004   GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &data.peer);
1005
1006   data.expiration_time =
1007     GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_HOURS, 2));
1008
1009   /* Sign the block */
1010   if (GNUNET_OK != GNUNET_CRYPTO_rsa_sign (my_private_key,
1011                                            &data.purpose, &data.signature))
1012     {
1013       GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "could not sign DNS_Record\n");
1014       return;
1015     }
1016
1017   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1018               "Putting with key %08x, size = %d\n",
1019               *((unsigned int *) &data.service_descriptor), size);
1020
1021   GNUNET_DHT_put (dht,
1022                   &data.service_descriptor,
1023                   DEFAULT_PUT_REPLICATION,
1024                   GNUNET_DHT_RO_NONE,
1025                   GNUNET_BLOCK_TYPE_DNS,
1026                   size,
1027                   (char *) &data,
1028                   GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_HOURS),
1029                   GNUNET_TIME_UNIT_MINUTES, NULL, NULL);
1030 }
1031
1032 /**
1033  * @brief Publishes the record defined by the section section
1034  *
1035  * @param cls closure
1036  * @param section the current section
1037  */
1038 void
1039 publish_iterate (void *cls __attribute__((unused)), const char *section)
1040 {
1041   if ((strlen(section) < 8) || (0 != strcmp (".gnunet.", section + (strlen(section) - 8))))
1042     return;
1043
1044   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Parsing dns-name %s\n", section);
1045
1046   char *udp_redirects, *tcp_redirects, *alternative_names, *alternative_name,
1047     *keyfile;
1048
1049   GNUNET_CONFIGURATION_get_value_string (cfg, section,
1050                                          "UDP_REDIRECTS", &udp_redirects);
1051   GNUNET_CONFIGURATION_get_value_string (cfg, section, "TCP_REDIRECTS",
1052                                          &tcp_redirects);
1053
1054   if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (cfg, "GNUNETD",
1055                                                             "HOSTKEY",
1056                                                             &keyfile))
1057     {
1058       GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "could not read keyfile-value\n");
1059       if (keyfile != NULL)
1060         GNUNET_free (keyfile);
1061       return;
1062     }
1063
1064   struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key =
1065     GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
1066   GNUNET_free (keyfile);
1067   GNUNET_assert (my_private_key != NULL);
1068
1069   uint64_t ports = get_port_from_redirects (udp_redirects, tcp_redirects);
1070   uint32_t service_type = 0;
1071
1072   if (NULL != udp_redirects)
1073     service_type = GNUNET_DNS_SERVICE_TYPE_UDP;
1074
1075   if (NULL != tcp_redirects)
1076     service_type |= GNUNET_DNS_SERVICE_TYPE_TCP;
1077
1078   service_type = htonl (service_type);
1079
1080
1081   publish_name (section, ports, service_type, my_private_key);
1082
1083   GNUNET_CONFIGURATION_get_value_string (cfg, section,
1084                                          "ALTERNATIVE_NAMES",
1085                                          &alternative_names);
1086   for (alternative_name = strtok (alternative_names, " ");
1087        alternative_name != NULL; alternative_name = strtok (NULL, " "))
1088     {
1089       char *altname =
1090         alloca (strlen (alternative_name) + strlen (section) + 1 + 1);
1091       strcpy (altname, alternative_name);
1092       strcpy (altname + strlen (alternative_name) + 1, section);
1093       altname[strlen (alternative_name)] = '.';
1094
1095       publish_name (altname, ports, service_type, my_private_key);
1096     }
1097
1098   GNUNET_free_non_null(alternative_names);
1099   GNUNET_CRYPTO_rsa_key_free (my_private_key);
1100   GNUNET_free_non_null (udp_redirects);
1101   GNUNET_free_non_null (tcp_redirects);
1102 }
1103
1104 /**
1105  * Publish a DNS-record in the DHT.
1106  */
1107 static void
1108 publish_names (void *cls __attribute__((unused)),
1109                const struct GNUNET_SCHEDULER_TaskContext *tc) {
1110     if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1111       return;
1112
1113     GNUNET_CONFIGURATION_iterate_sections(cfg, publish_iterate, NULL);
1114
1115     GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_HOURS,
1116                                   publish_names,
1117                                   NULL);
1118 }
1119
1120 /**
1121  * @param cls closure
1122  * @param server the initialized server
1123  * @param cfg_ configuration to use
1124  */
1125 static void
1126 run (void *cls,
1127      struct GNUNET_SERVER_Handle *server,
1128      const struct GNUNET_CONFIGURATION_Handle *cfg_)
1129 {
1130   static const struct GNUNET_SERVER_MessageHandler handlers[] = {
1131     /* callback, cls, type, size */
1132     {&receive_query, NULL, GNUNET_MESSAGE_TYPE_LOCAL_QUERY_DNS, 0},
1133     {&rehijack, NULL, GNUNET_MESSAGE_TYPE_REHIJACK,
1134      sizeof (struct GNUNET_MessageHeader)},
1135     {NULL, NULL, 0, 0}
1136   };
1137
1138   static const struct GNUNET_MESH_MessageHandler mesh_handlers[] = {
1139     {receive_mesh_query, GNUNET_MESSAGE_TYPE_REMOTE_QUERY_DNS, 0},
1140     {receive_mesh_answer, GNUNET_MESSAGE_TYPE_REMOTE_ANSWER_DNS, 0},
1141     {NULL, 0, 0}
1142   };
1143
1144   static GNUNET_MESH_ApplicationType *apptypes;
1145
1146   if (GNUNET_YES ==
1147       GNUNET_CONFIGURATION_get_value_yesno (cfg_, "dns", "PROVIDE_EXIT"))
1148     apptypes = (GNUNET_MESH_ApplicationType[])
1149     {
1150     GNUNET_APPLICATION_TYPE_INTERNET_RESOLVER,
1151     GNUNET_APPLICATION_TYPE_END};
1152   else
1153   apptypes = (GNUNET_MESH_ApplicationType[])
1154   {
1155   GNUNET_APPLICATION_TYPE_END};
1156
1157   mesh_handle =
1158     GNUNET_MESH_connect (cfg_, NULL, NULL, mesh_handlers, apptypes);
1159
1160   cfg = cfg_;
1161
1162   unsigned int i;
1163   for (i = 0; i < 65536; i++)
1164     {
1165       query_states[i].valid = GNUNET_NO;
1166     }
1167
1168   dht = GNUNET_DHT_connect (cfg, 1024);
1169
1170   open_port ();
1171
1172   GNUNET_SCHEDULER_add_now (publish_names, NULL);
1173
1174   GNUNET_SERVER_add_handlers (server, handlers);
1175   GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
1176                                 &cleanup_task, cls);
1177 }
1178
1179 /**
1180  * The main function for the dns service.
1181  *
1182  * @param argc number of arguments from the command line
1183  * @param argv command line arguments
1184  * @return 0 ok, 1 on error
1185  */
1186 int
1187 main (int argc, char *const *argv)
1188 {
1189   return (GNUNET_OK ==
1190           GNUNET_SERVICE_run (argc,
1191                               argv,
1192                               "dns",
1193                               GNUNET_SERVICE_OPTION_NONE,
1194                               &run, NULL)) ? 0 : 1;
1195 }