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   if (NULL == peer) return;
 242   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Connected to peer %x\n", *((unsigned long*)peer));
 243   struct tunnel_cls *cls_ = (struct tunnel_cls*)cls;
 244
 245   GNUNET_MESH_notify_transmit_ready(cls_->tunnel,
 246                                     GNUNET_YES,
 247                                     42,
 248                                     GNUNET_TIME_UNIT_MINUTES,
 249                                     NULL,
 250                                     cls_->hdr.size,
 251                                     mesh_send,
 252                                     cls);
 253 }
 254
 255
 256 static void
 257 send_mesh_query (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
 258 {
 259   if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
 260     return;
 261
 262   struct tunnel_cls *cls_ = (struct tunnel_cls*)cls;
 263
 264   cls_->tunnel = GNUNET_MESH_peer_request_connect_by_type(mesh_handle,
 265                                            GNUNET_TIME_UNIT_HOURS,
 266                                            GNUNET_APPLICATION_TYPE_INTERNET_RESOLVER,
 267                                            mesh_connect,
 268                                            NULL,
 269                                            cls_);
 270
 271   remote_pending[cls_->dns.s.id] = cls_;
 272 }
 273
 274 static int
 275 receive_mesh_query (void *cls __attribute__((unused)),
 276                     struct GNUNET_MESH_Tunnel *tunnel,
 277                     void **ctx __attribute__((unused)),
 278                     const struct GNUNET_PeerIdentity *sender __attribute__((unused)),
 279                     const struct GNUNET_MessageHeader *message,
 280                     const struct GNUNET_TRANSPORT_ATS_Information *atsi __attribute__((unused)))
 281 {
 282   struct dns_pkt *dns = (struct dns_pkt*)(message + 1);
 283
 284   struct sockaddr_in dest;
 285   memset(&dest, 0, sizeof dest);
 286   dest.sin_port = htons(53);
 287   /* TODO: read from config */
 288   inet_pton(AF_INET, "8.8.8.8", &dest.sin_addr);
 289
 290   query_states[dns->s.id].tunnel = tunnel;
 291   query_states[dns->s.id].valid = GNUNET_YES;
 292
 293   GNUNET_NETWORK_socket_sendto(dnsout,
 294                                dns,
 295                                ntohs(message->size) - sizeof(struct GNUNET_MessageHeader),
 296                                (struct sockaddr*) &dest,
 297                                sizeof dest);
 298
 299   return GNUNET_SYSERR;
 300 }
 301
 302 static int
 303 receive_mesh_answer (void *cls __attribute__((unused)),
 304                      struct GNUNET_MESH_Tunnel *tunnel,
 305                      void **ctx __attribute__((unused)),
 306                      const struct GNUNET_PeerIdentity *sender __attribute__((unused)),
 307                      const struct GNUNET_MessageHeader *message,
 308                      const struct GNUNET_TRANSPORT_ATS_Information *atsi __attribute__((unused)))
 309 {
 310   /* TODo: size check */
 311   struct dns_pkt *dns = (struct dns_pkt *) (message + 1);
 312
 313   /* They sent us a packet we were not waiting for */
 314   if (remote_pending[dns->s.id] == NULL
 315       || remote_pending[dns->s.id]->tunnel != tunnel)
 316     return GNUNET_SYSERR;
 317   if (query_states[dns->s.id].valid != GNUNET_YES)
 318     return GNUNET_SYSERR;
 319   query_states[dns->s.id].valid = GNUNET_NO;
 320
 321   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 */
 322     + sizeof (struct dns_record_line) - 1 + 16; /* To hold the IPv6-Address */
 323
 324   struct answer_packet_list *answer =
 325     GNUNET_malloc (len + 2 * sizeof (struct answer_packet_list *));
 326   memset (answer, 0, len + 2 * sizeof (struct answer_packet_list *));
 327
 328   answer->pkt.hdr.type = htons (GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 329   answer->pkt.hdr.size = htons (len);
 330   answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_REMOTE;
 331
 332   struct dns_pkt_parsed* pdns = parse_dns_packet(dns);
 333
 334   if (ntohs(pdns->s.ancount) < 1)
 335     {
 336       free_parsed_dns_packet(pdns);
 337       return GNUNET_OK;
 338     }
 339
 340   answer->pkt.addrsize = pdns->answers[0]->data_len;
 341   memcpy(answer->pkt.addr, pdns->answers[0]->data, ntohs(pdns->answers[0]->data_len));
 342
 343   answer->pkt.from = query_states[dns->s.id].remote_ip;
 344
 345   answer->pkt.to = query_states[dns->s.id].local_ip;
 346   answer->pkt.dst_port = query_states[dns->s.id].local_port;
 347
 348   struct dns_pkt *dpkt = (struct dns_pkt *) answer->pkt.data;
 349
 350   dpkt->s.id = dns->s.id;
 351   dpkt->s.aa = 1;
 352   dpkt->s.qr = 1;
 353   dpkt->s.ra = 1;
 354   dpkt->s.qdcount = htons (1);
 355   dpkt->s.ancount = htons (1);
 356
 357   memcpy (dpkt->data, query_states[dns->s.id].name,
 358           query_states[dns->s.id].namelen);
 359   GNUNET_free (query_states[dns->s.id].name);
 360
 361   struct dns_query_line *dque =
 362     (struct dns_query_line *) (dpkt->data +
 363                                (query_states[dns->s.id].namelen));
 364   dque->type = htons (28);      /* AAAA */
 365   dque->class = htons (1);      /* IN */
 366
 367   char *anname =
 368     (char *) (dpkt->data + (query_states[dns->s.id].namelen) +
 369               sizeof (struct dns_query_line));
 370   memcpy (anname, "\xc0\x0c", 2);
 371
 372   struct dns_record_line *drec_data =
 373     (struct dns_record_line *) (dpkt->data +
 374                                 (query_states[dns->s.id].namelen) +
 375                                 sizeof (struct dns_query_line) + 2);
 376   drec_data->type = htons (28); /* AAAA */
 377   drec_data->class = htons (1); /* IN */
 378
 379   drec_data->ttl = pdns->answers[0]->ttl;
 380   drec_data->data_len = htons (16);
 381
 382   /* Calculate at which offset in the packet the IPv6-Address belongs, it is
 383    * filled in by the daemon-vpn */
 384   answer->pkt.addroffset =
 385     htons ((unsigned short) ((unsigned long) (&drec_data->data) -
 386                              (unsigned long) (&answer->pkt)));
 387
 388   GNUNET_CONTAINER_DLL_insert_after (head, tail, tail, answer);
 389
 390   GNUNET_SERVER_notify_transmit_ready (query_states[dns->s.id].client,
 391                                        len,
 392                                        GNUNET_TIME_UNIT_FOREVER_REL,
 393                                        &send_answer,
 394                                        query_states[dns->s.id].client);
 395
 396   free_parsed_dns_packet(pdns);
 397   return GNUNET_OK;
 398 }
 399
 400
 401 static void
 402 send_rev_query(void * cls, const struct GNUNET_SCHEDULER_TaskContext *tc) {
 403     if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
 404       return;
 405
 406     struct dns_pkt_parsed* pdns = (struct dns_pkt_parsed*) cls;
 407
 408     unsigned short id = pdns->s.id;
 409
 410     free_parsed_dns_packet(pdns);
 411
 412     if (query_states[id].valid != GNUNET_YES) return;
 413     query_states[id].valid = GNUNET_NO;
 414
 415     GNUNET_assert(query_states[id].namelen == 74);
 416
 417     size_t len = sizeof(struct answer_packet) - 1 \
 418                  + sizeof(struct dns_static) \
 419                  + 74 /* this is the length of a reverse ipv6-lookup */ \
 420                  + sizeof(struct dns_query_line) \
 421                  + 2 /* To hold the pointer (as defined in RFC1035) to the name */ \
 422                  + sizeof(struct dns_record_line) - 1 \
 423                  - 2 /* We do not know the lenght of the answer yet*/;
 424
 425     struct answer_packet_list* answer = GNUNET_malloc(len + 2*sizeof(struct answer_packet_list*));
 426     memset(answer, 0, len + 2*sizeof(struct answer_packet_list*));
 427
 428     answer->pkt.hdr.type = htons(GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 429     answer->pkt.hdr.size = htons(len);
 430     answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_REV;
 431
 432     answer->pkt.from = query_states[id].remote_ip;
 433
 434     answer->pkt.to = query_states[id].local_ip;
 435     answer->pkt.dst_port = query_states[id].local_port;
 436
 437     struct dns_pkt *dpkt = (struct dns_pkt*)answer->pkt.data;
 438
 439     dpkt->s.id = id;
 440     dpkt->s.aa = 1;
 441     dpkt->s.qr = 1;
 442     dpkt->s.ra = 1;
 443     dpkt->s.qdcount = htons(1);
 444     dpkt->s.ancount = htons(1);
 445
 446     memcpy(dpkt->data, query_states[id].name, query_states[id].namelen);
 447     GNUNET_free(query_states[id].name);
 448
 449     struct dns_query_line* dque = (struct dns_query_line*)(dpkt->data+(query_states[id].namelen));
 450     dque->type = htons(12); /* PTR */
 451     dque->class = htons(1); /* IN */
 452
 453     char* anname = (char*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line));
 454     memcpy(anname, "\xc0\x0c", 2);
 455
 456     struct dns_record_line *drec_data = (struct dns_record_line*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line)+2);
 457     drec_data->type = htons(12); /* AAAA */
 458     drec_data->class = htons(1); /* IN */
 459     /* FIXME: read the TTL from block:
 460      * GNUNET_TIME_absolute_get_remaining(rec->expiration_time)
 461      *
 462      * But how to get the seconds out of this?
 463      */
 464     drec_data->ttl = htonl(3600);
 465
 466     /* Calculate at which offset in the packet the length of the name and the
 467      * name, it is filled in by the daemon-vpn */
 468     answer->pkt.addroffset = htons((unsigned short)((unsigned long)(&drec_data->data_len)-(unsigned long)(&answer->pkt)));
 469
 470     GNUNET_CONTAINER_DLL_insert_after(head, tail, tail, answer);
 471
 472     GNUNET_SERVER_notify_transmit_ready(query_states[id].client,
 473                                         len,
 474                                         GNUNET_TIME_UNIT_FOREVER_REL,
 475                                         &send_answer,
 476                                         query_states[id].client);
 477 }
 478
 479 /**
 480  * Receive a block from the dht.
 481  */
 482 static void
 483 receive_dht(void *cls,
 484             struct GNUNET_TIME_Absolute exp __attribute__((unused)),
 485             const GNUNET_HashCode *key __attribute__((unused)),
 486             const struct GNUNET_PeerIdentity *const *get_path __attribute__((unused)),
 487             const struct GNUNET_PeerIdentity *const *put_path __attribute__((unused)),
 488             enum GNUNET_BLOCK_Type type,
 489             size_t size,
 490             const void *data) {
 491
 492     unsigned short id = ((struct receive_dht_cls*)cls)->id;
 493     struct GNUNET_DHT_GetHandle* handle = ((struct receive_dht_cls*)cls)->handle;
 494     GNUNET_free(cls);
 495
 496     GNUNET_assert(type == GNUNET_BLOCK_TYPE_DNS);
 497
 498     /* If no query with this id is pending, ignore the block */
 499     if (query_states[id].valid != GNUNET_YES) return;
 500     query_states[id].valid = GNUNET_NO;
 501
 502     const struct GNUNET_DNS_Record* rec = data;
 503     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 504                "Got block of size %d, peer: %08x, desc: %08x\n",
 505                size,
 506                *((unsigned int*)&rec->peer),
 507                *((unsigned int*)&rec->service_descriptor));
 508
 509     size_t len = sizeof(struct answer_packet) - 1 \
 510                  + sizeof(struct dns_static) \
 511                  + query_states[id].namelen \
 512                  + sizeof(struct dns_query_line) \
 513                  + 2 /* To hold the pointer (as defined in RFC1035) to the name */ \
 514                  + sizeof(struct dns_record_line) - 1 \
 515                  + 16; /* To hold the IPv6-Address */
 516
 517     struct answer_packet_list* answer = GNUNET_malloc(len + 2*sizeof(struct answer_packet_list*));
 518     memset(answer, 0, len + 2*sizeof(struct answer_packet_list*));
 519
 520     answer->pkt.hdr.type = htons(GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 521     answer->pkt.hdr.size = htons(len);
 522     answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_SERVICE;
 523
 524     GNUNET_CRYPTO_hash(&rec->peer,
 525                        sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
 526                        &answer->pkt.service_descr.peer);
 527
 528     memcpy(&answer->pkt.service_descr.service_descriptor,
 529            &rec->service_descriptor,
 530            sizeof(GNUNET_HashCode));
 531     memcpy(&answer->pkt.service_descr.service_type,
 532            &rec->service_type,
 533            sizeof(answer->pkt.service_descr.service_type));
 534     memcpy(&answer->pkt.service_descr.ports, &rec->ports, sizeof(answer->pkt.service_descr.ports));
 535
 536     answer->pkt.from = query_states[id].remote_ip;
 537
 538     answer->pkt.to = query_states[id].local_ip;
 539     answer->pkt.dst_port = query_states[id].local_port;
 540
 541     struct dns_pkt *dpkt = (struct dns_pkt*)answer->pkt.data;
 542
 543     dpkt->s.id = id;
 544     dpkt->s.aa = 1;
 545     dpkt->s.qr = 1;
 546     dpkt->s.ra = 1;
 547     dpkt->s.qdcount = htons(1);
 548     dpkt->s.ancount = htons(1);
 549
 550     memcpy(dpkt->data, query_states[id].name, query_states[id].namelen);
 551     GNUNET_free(query_states[id].name);
 552
 553     struct dns_query_line* dque = (struct dns_query_line*)(dpkt->data+(query_states[id].namelen));
 554     dque->type = htons(28); /* AAAA */
 555     dque->class = htons(1); /* IN */
 556
 557     char* anname = (char*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line));
 558     memcpy(anname, "\xc0\x0c", 2);
 559
 560     struct dns_record_line *drec_data = (struct dns_record_line*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line)+2);
 561     drec_data->type = htons(28); /* AAAA */
 562     drec_data->class = htons(1); /* IN */
 563
 564     /* FIXME: read the TTL from block:
 565      * GNUNET_TIME_absolute_get_remaining(rec->expiration_time)
 566      *
 567      * But how to get the seconds out of this?
 568      */
 569     drec_data->ttl = htonl(3600);
 570     drec_data->data_len = htons(16);
 571
 572     /* Calculate at which offset in the packet the IPv6-Address belongs, it is
 573      * filled in by the daemon-vpn */
 574     answer->pkt.addroffset = htons((unsigned short)((unsigned long)(&drec_data->data)-(unsigned long)(&answer->pkt)));
 575
 576     GNUNET_CONTAINER_DLL_insert_after(head, tail, tail, answer);
 577
 578     GNUNET_SERVER_notify_transmit_ready(query_states[id].client,
 579                                         len,
 580                                         GNUNET_TIME_UNIT_FOREVER_REL,
 581                                         &send_answer,
 582                                         query_states[id].client);
 583
 584     GNUNET_DHT_get_stop(handle);
 585 }
 586
 587 /**
 588  * This receives a GNUNET_MESSAGE_TYPE_REHIJACK and rehijacks the DNS
 589  */
 590 static void
 591 rehijack(void *cls __attribute__((unused)),
 592          struct GNUNET_SERVER_Client *client,
 593          const struct GNUNET_MessageHeader *message __attribute__((unused))) {
 594     unhijack(dnsoutport);
 595     GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_UNIT_SECONDS, hijack, NULL);
 596
 597     GNUNET_SERVER_receive_done(client, GNUNET_OK);
 598 }
 599
 600 /**
 601  * This receives the dns-payload from the daemon-vpn and sends it on over the udp-socket
 602  */
 603 static void
 604 receive_query(void *cls __attribute__((unused)),
 605               struct GNUNET_SERVER_Client *client,
 606               const struct GNUNET_MessageHeader *message) {
 607     struct query_packet* pkt = (struct query_packet*)message;
 608     struct dns_pkt* dns = (struct dns_pkt*)pkt->data;
 609     struct dns_pkt_parsed* pdns = parse_dns_packet(dns);
 610
 611     query_states[dns->s.id].valid = GNUNET_YES;
 612     query_states[dns->s.id].client = client;
 613     query_states[dns->s.id].local_ip = pkt->orig_from;
 614     query_states[dns->s.id].local_port = pkt->src_port;
 615     query_states[dns->s.id].remote_ip = pkt->orig_to;
 616     query_states[dns->s.id].namelen = strlen((char*)dns->data) + 1;
 617     query_states[dns->s.id].name = GNUNET_malloc(query_states[dns->s.id].namelen);
 618     memcpy(query_states[dns->s.id].name, dns->data, query_states[dns->s.id].namelen);
 619
 620     /* The query is for a .gnunet-address */
 621     if (pdns->queries[0]->namelen > 9 &&
 622         0 == strncmp(pdns->queries[0]->name+(pdns->queries[0]->namelen - 9), ".gnunet.", 9))
 623       {
 624         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Query for .gnunet!\n");
 625         GNUNET_HashCode key;
 626         GNUNET_CRYPTO_hash(pdns->queries[0]->name, pdns->queries[0]->namelen, &key);
 627
 628         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 629                    "Getting with key %08x, len is %d\n",
 630                    *((unsigned int*)&key),
 631                    pdns->queries[0]->namelen);
 632
 633         struct receive_dht_cls* cls = GNUNET_malloc(sizeof(struct receive_dht_cls));
 634         cls->id = dns->s.id;
 635
 636         cls->handle = GNUNET_DHT_get_start(dht,
 637                                            GNUNET_TIME_UNIT_MINUTES,
 638                                            GNUNET_BLOCK_TYPE_DNS,
 639                                            &key,
 640                                            DEFAULT_GET_REPLICATION,
 641                                            GNUNET_DHT_RO_NONE,
 642                                            NULL,
 643                                            0,
 644                                            NULL,
 645                                            0,
 646                                            receive_dht,
 647                                            cls);
 648
 649         goto outfree;
 650       }
 651
 652     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Query for '%s'; namelen=%d\n", pdns->queries[0]->name, pdns->queries[0]->namelen);
 653
 654     /* This is a PTR-Query. Check if it is for "our" network */
 655     if (htons(pdns->queries[0]->qtype) == 12 &&
 656         74 == pdns->queries[0]->namelen)
 657       {
 658         char* ipv6addr;
 659         char ipv6[16];
 660         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.";
 661         unsigned int i;
 662         unsigned long long ipv6prefix;
 663         unsigned int comparelen;
 664
 665         GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_string(cfg, "vpn", "IPV6ADDR", &ipv6addr));
 666         inet_pton (AF_INET6, ipv6addr, ipv6);
 667         GNUNET_free(ipv6addr);
 668
 669         GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_number(cfg, "vpn", "IPV6PREFIX", &ipv6prefix));
 670         GNUNET_assert(ipv6prefix < 127);
 671         ipv6prefix = (ipv6prefix + 7)/8;
 672
 673         for (i = ipv6prefix; i < 16; i++)
 674           ipv6[i] = 0;
 675
 676         for (i = 0; i < 16; i++)
 677           {
 678             unsigned char c1 = ipv6[i] >> 4;
 679             unsigned char c2 = ipv6[i] & 0xf;
 680
 681             if (c1 <= 9)
 682               ipv6rev[62-(4*i)] = c1 + '0';
 683             else
 684               ipv6rev[62-(4*i)] = c1 + 87; /* 87 is the difference between 'a' and 10 */
 685
 686             if (c2 <= 9)
 687               ipv6rev[62-((4*i)+2)] = c2 + '0';
 688             else
 689               ipv6rev[62-((4*i)+2)] = c2 + 87;
 690           }
 691         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "My network is %s'.\n", ipv6rev);
 692         comparelen = 10 + 4*ipv6prefix;
 693         if(0 == strncmp(pdns->queries[0]->name+(pdns->queries[0]->namelen - comparelen),
 694                         ipv6rev + (74 - comparelen),
 695                         comparelen))
 696           {
 697             GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Reverse-Query for .gnunet!\n");
 698
 699             GNUNET_SCHEDULER_add_now(send_rev_query, pdns);
 700
 701             goto out;
 702           }
 703       }
 704
 705     char* virt_dns;
 706     unsigned int virt_dns_bytes;
 707     if (GNUNET_SYSERR ==
 708         GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "VIRTDNS",
 709                                                &virt_dns))
 710       {
 711         GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 712                     "No entry 'VIRTDNS' in configuration!\n");
 713         exit (1);
 714       }
 715
 716     if (1 != inet_pton (AF_INET, virt_dns, &virt_dns_bytes))
 717       {
 718         GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 719                     "Error parsing 'VIRTDNS': %s; %m!\n", virt_dns);
 720         exit(1);
 721       }
 722
 723     GNUNET_free(virt_dns);
 724
 725     if (virt_dns_bytes == pkt->orig_to)
 726       {
 727         /* This is a packet that was sent directly to the virtual dns-server
 728          *
 729          * This means we have to send this query over gnunet
 730          */
 731
 732         size_t size = sizeof(struct GNUNET_MESH_Tunnel*) + sizeof(struct GNUNET_MessageHeader) + (ntohs(message->size) - sizeof(struct query_packet) + 1);
 733         struct tunnel_cls *cls_ =  GNUNET_malloc(size);
 734         cls_->hdr.size = size - sizeof(struct GNUNET_MESH_Tunnel*);
 735
 736         cls_->hdr.type = ntohs(GNUNET_MESSAGE_TYPE_REMOTE_QUERY_DNS);
 737         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "size: %d\n", size);
 738
 739         memcpy(&cls_->dns, dns, cls_->hdr.size - sizeof(struct GNUNET_MessageHeader));
 740         GNUNET_SCHEDULER_add_now(send_mesh_query, cls_);
 741
 742         goto out;
 743       }
 744
 745
 746     /* The query should be sent to the network */
 747
 748     struct sockaddr_in dest;
 749     memset(&dest, 0, sizeof dest);
 750     dest.sin_port = htons(53);
 751     dest.sin_addr.s_addr = pkt->orig_to;
 752
 753     GNUNET_NETWORK_socket_sendto(dnsout,
 754                                  dns,
 755                                  ntohs(pkt->hdr.size) - sizeof(struct query_packet) + 1,
 756                                  (struct sockaddr*) &dest,
 757                                  sizeof dest);
 758
 759 outfree:
 760     free_parsed_dns_packet(pdns);
 761     pdns = NULL;
 762 out:
 763     GNUNET_SERVER_receive_done(client, GNUNET_OK);
 764 }
 765
 766 static void read_response (void *cls,
 767                            const struct GNUNET_SCHEDULER_TaskContext *tc);
 768
 769 static void
 770 open_port ()
 771 {
 772   struct sockaddr_in addr;
 773
 774   dnsout = GNUNET_NETWORK_socket_create (AF_INET, SOCK_DGRAM, 0);
 775   if (dnsout == NULL)
 776     return;
 777   memset (&addr, 0, sizeof (struct sockaddr_in));
 778
 779   int err = GNUNET_NETWORK_socket_bind (dnsout,
 780                                         (struct sockaddr *) &addr,
 781                                         sizeof (struct sockaddr_in));
 782
 783   if (err != GNUNET_YES)
 784     {
 785       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 786                   "Could not bind a port, exiting\n");
 787       return;
 788     }
 789
 790   /* Read the port we bound to */
 791   socklen_t addrlen = sizeof (struct sockaddr_in);
 792   err = getsockname (GNUNET_NETWORK_get_fd (dnsout),
 793                      (struct sockaddr *) &addr, &addrlen);
 794
 795   dnsoutport = htons (addr.sin_port);
 796
 797   GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL, dnsout,
 798                                  &read_response, NULL);
 799 }
 800
 801 /**
 802  * Read a response-packet of the UDP-Socket
 803  */
 804 static void
 805 read_response (void *cls __attribute__((unused)), const struct GNUNET_SCHEDULER_TaskContext *tc)
 806 {
 807   struct sockaddr_in addr;
 808   socklen_t addrlen = sizeof (addr);
 809   int r;
 810   int len;
 811
 812   if (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
 813     return;
 814
 815   memset (&addr, 0, sizeof addr);
 816
 817 #ifndef MINGW
 818   if (0 != ioctl (GNUNET_NETWORK_get_fd (dnsout), FIONREAD, &len))
 819     {
 820       unhijack (dnsoutport);
 821       open_port ();
 822       GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS, hijack, NULL);
 823       return;
 824     }
 825 #else
 826   /* port the code above? */
 827   len = 65536;
 828 #endif
 829   {
 830     unsigned char buf[len];
 831     struct dns_pkt *dns = (struct dns_pkt *) buf;
 832
 833     r = GNUNET_NETWORK_socket_recvfrom (dnsout,
 834                                         buf,
 835                                         sizeof (buf),
 836                                         (struct sockaddr *) &addr, &addrlen);
 837
 838     if (r < 0)
 839       {
 840         unhijack (dnsoutport);
 841         open_port ();
 842         GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS, hijack, NULL);
 843         return;
 844       }
 845
 846     if (query_states[dns->s.id].valid == GNUNET_YES)
 847       {
 848         if (query_states[dns->s.id].tunnel != NULL)
 849           {
 850             uint32_t *c = GNUNET_malloc(4 + r);
 851             *c = r;
 852             memcpy(c+1, dns, r);
 853             GNUNET_MESH_notify_transmit_ready (query_states[dns->s.id].tunnel,
 854                                                GNUNET_YES,
 855                                                32,
 856                                                GNUNET_TIME_UNIT_MINUTES,
 857                                                NULL, r + sizeof(struct GNUNET_MessageHeader), mesh_send_response, c);
 858           }
 859         else
 860           {
 861             query_states[dns->s.id].valid = GNUNET_NO;
 862
 863             size_t len = sizeof (struct answer_packet) + r - 1; /* 1 for the unsigned char data[1]; */
 864             struct answer_packet_list *answer =
 865               GNUNET_malloc (len + 2 * sizeof (struct answer_packet_list *));
 866             answer->pkt.hdr.type =
 867               htons (GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 868             answer->pkt.hdr.size = htons (len);
 869             answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_IP;
 870             answer->pkt.from = addr.sin_addr.s_addr;
 871             answer->pkt.to = query_states[dns->s.id].local_ip;
 872             answer->pkt.dst_port = query_states[dns->s.id].local_port;
 873             memcpy (answer->pkt.data, buf, r);
 874
 875             GNUNET_CONTAINER_DLL_insert_after (head, tail, tail, answer);
 876
 877             GNUNET_SERVER_notify_transmit_ready (query_states[dns->s.id].
 878                                                  client, len,
 879                                                  GNUNET_TIME_UNIT_FOREVER_REL,
 880                                                  &send_answer,
 881                                                  query_states[dns->s.id].
 882                                                  client);
 883           }
 884       }
 885   }
 886   GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
 887                                  dnsout, &read_response, NULL);
 888 }
 889
 890
 891 /**
 892  * Task run during shutdown.
 893  *
 894  * @param cls unused
 895  * @param tc unused
 896  */
 897 static void
 898 cleanup_task (void *cls __attribute__((unused)),
 899               const struct GNUNET_SCHEDULER_TaskContext *tc)
 900 {
 901   GNUNET_assert(0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN));
 902
 903   unhijack(dnsoutport);
 904   GNUNET_DHT_disconnect(dht);
 905 }
 906
 907 /**
 908  * @brief Create a port-map from udp and tcp redirects
 909  *
 910  * @param udp_redirects
 911  * @param tcp_redirects
 912  *
 913  * @return
 914  */
 915 uint64_t
 916 get_port_from_redirects (const char *udp_redirects, const char *tcp_redirects)
 917 {
 918   uint64_t ret = 0;
 919   char* cpy, *hostname, *redirect;
 920   int local_port, count = 0;
 921
 922   if (NULL != udp_redirects)
 923     {
 924       cpy = GNUNET_strdup (udp_redirects);
 925       for (redirect = strtok (cpy, " "); redirect != NULL; redirect = strtok (NULL, " "))
 926         {
 927           if (NULL == (hostname = strstr (redirect, ":")))
 928             {
 929               GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: option %s is not formatted correctly!\n", redirect);
 930               continue;
 931             }
 932           hostname[0] = '\0';
 933           local_port = atoi (redirect);
 934           if (!((local_port > 0) && (local_port < 65536)))
 935             GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: %s is not a correct port.", redirect);
 936
 937           ret |= (0xFFFF & htons(local_port));
 938           ret <<= 16;
 939           count ++;
 940
 941           if(count > 4)
 942             {
 943               ret = 0;
 944               goto out;
 945             }
 946         }
 947       GNUNET_free(cpy);
 948       cpy = NULL;
 949     }
 950
 951   if (NULL != tcp_redirects)
 952     {
 953       cpy = GNUNET_strdup (tcp_redirects);
 954       for (redirect = strtok (cpy, " "); redirect != NULL; redirect = strtok (NULL, " "))
 955         {
 956           if (NULL == (hostname = strstr (redirect, ":")))
 957             {
 958               GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: option %s is not formatted correctly!\n", redirect);
 959               continue;
 960             }
 961           hostname[0] = '\0';
 962           local_port = atoi (redirect);
 963           if (!((local_port > 0) && (local_port < 65536)))
 964             GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: %s is not a correct port.", redirect);
 965
 966           ret |= (0xFFFF & htons(local_port));
 967           ret <<= 16;
 968           count ++;
 969
 970           if(count > 4)
 971             {
 972               ret = 0;
 973               goto out;
 974             }
 975         }
 976       GNUNET_free(cpy);
 977       cpy = NULL;
 978     }
 979
 980 out:
 981   if (NULL != cpy)
 982     GNUNET_free(cpy);
 983   return ret;
 984 }
 985
 986 void
 987 publish_name (const char *name, uint64_t ports, uint32_t service_type,
 988               struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key)
 989 {
 990   size_t size = sizeof (struct GNUNET_DNS_Record);
 991   struct GNUNET_DNS_Record data;
 992   memset (&data, 0, size);
 993
 994   data.purpose.size =
 995     htonl (size - sizeof (struct GNUNET_CRYPTO_RsaSignature));
 996   data.purpose.purpose = GNUNET_SIGNATURE_PURPOSE_DNS_RECORD;
 997
 998   GNUNET_CRYPTO_hash (name, strlen (name) + 1, &data.service_descriptor);
 999   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Store with key1 %x\n",
1000               *((unsigned long long *) &data.service_descriptor));
1001
1002   data.service_type = service_type;
1003   data.ports = ports;
1004
1005   GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &data.peer);
1006
1007   data.expiration_time =
1008     GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_HOURS, 2));
1009
1010   /* Sign the block */
1011   if (GNUNET_OK != GNUNET_CRYPTO_rsa_sign (my_private_key,
1012                                            &data.purpose, &data.signature))
1013     {
1014       GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "could not sign DNS_Record\n");
1015       return;
1016     }
1017
1018   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1019               "Putting with key %08x, size = %d\n",
1020               *((unsigned int *) &data.service_descriptor), size);
1021
1022   GNUNET_DHT_put (dht,
1023                   &data.service_descriptor,
1024                   DEFAULT_PUT_REPLICATION,
1025                   GNUNET_DHT_RO_NONE,
1026                   GNUNET_BLOCK_TYPE_DNS,
1027                   size,
1028                   (char *) &data,
1029                   GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_HOURS),
1030                   GNUNET_TIME_UNIT_MINUTES, NULL, NULL);
1031 }
1032
1033 /**
1034  * @brief Publishes the record defined by the section section
1035  *
1036  * @param cls closure
1037  * @param section the current section
1038  */
1039 void
1040 publish_iterate (void *cls __attribute__((unused)), const char *section)
1041 {
1042   if ((strlen(section) < 8) || (0 != strcmp (".gnunet.", section + (strlen(section) - 8))))
1043     return;
1044
1045   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Parsing dns-name %s\n", section);
1046
1047   char *udp_redirects, *tcp_redirects, *alternative_names, *alternative_name,
1048     *keyfile;
1049
1050   GNUNET_CONFIGURATION_get_value_string (cfg, section,
1051                                          "UDP_REDIRECTS", &udp_redirects);
1052   GNUNET_CONFIGURATION_get_value_string (cfg, section, "TCP_REDIRECTS",
1053                                          &tcp_redirects);
1054
1055   if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (cfg, "GNUNETD",
1056                                                             "HOSTKEY",
1057                                                             &keyfile))
1058     {
1059       GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "could not read keyfile-value\n");
1060       if (keyfile != NULL)
1061         GNUNET_free (keyfile);
1062       return;
1063     }
1064
1065   struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key =
1066     GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
1067   GNUNET_free (keyfile);
1068   GNUNET_assert (my_private_key != NULL);
1069
1070   uint64_t ports = get_port_from_redirects (udp_redirects, tcp_redirects);
1071   uint32_t service_type = 0;
1072
1073   if (NULL != udp_redirects)
1074     service_type = GNUNET_DNS_SERVICE_TYPE_UDP;
1075
1076   if (NULL != tcp_redirects)
1077     service_type |= GNUNET_DNS_SERVICE_TYPE_TCP;
1078
1079   service_type = htonl (service_type);
1080
1081
1082   publish_name (section, ports, service_type, my_private_key);
1083
1084   GNUNET_CONFIGURATION_get_value_string (cfg, section,
1085                                          "ALTERNATIVE_NAMES",
1086                                          &alternative_names);
1087   for (alternative_name = strtok (alternative_names, " ");
1088        alternative_name != NULL; alternative_name = strtok (NULL, " "))
1089     {
1090       char *altname =
1091         alloca (strlen (alternative_name) + strlen (section) + 1 + 1);
1092       strcpy (altname, alternative_name);
1093       strcpy (altname + strlen (alternative_name) + 1, section);
1094       altname[strlen (alternative_name)] = '.';
1095
1096       publish_name (altname, ports, service_type, my_private_key);
1097     }
1098
1099   GNUNET_free_non_null(alternative_names);
1100   GNUNET_CRYPTO_rsa_key_free (my_private_key);
1101   GNUNET_free_non_null (udp_redirects);
1102   GNUNET_free_non_null (tcp_redirects);
1103 }
1104
1105 /**
1106  * Publish a DNS-record in the DHT.
1107  */
1108 static void
1109 publish_names (void *cls __attribute__((unused)),
1110                const struct GNUNET_SCHEDULER_TaskContext *tc) {
1111     if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1112       return;
1113
1114     GNUNET_CONFIGURATION_iterate_sections(cfg, publish_iterate, NULL);
1115
1116     GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_HOURS,
1117                                   publish_names,
1118                                   NULL);
1119 }
1120
1121 /**
1122  * @param cls closure
1123  * @param server the initialized server
1124  * @param cfg_ configuration to use
1125  */
1126 static void
1127 run (void *cls,
1128      struct GNUNET_SERVER_Handle *server,
1129      const struct GNUNET_CONFIGURATION_Handle *cfg_)
1130 {
1131   static const struct GNUNET_SERVER_MessageHandler handlers[] = {
1132     /* callback, cls, type, size */
1133     {&receive_query, NULL, GNUNET_MESSAGE_TYPE_LOCAL_QUERY_DNS, 0},
1134     {&rehijack, NULL, GNUNET_MESSAGE_TYPE_REHIJACK,
1135      sizeof (struct GNUNET_MessageHeader)},
1136     {NULL, NULL, 0, 0}
1137   };
1138
1139   static const struct GNUNET_MESH_MessageHandler mesh_handlers[] = {
1140     {receive_mesh_query, GNUNET_MESSAGE_TYPE_REMOTE_QUERY_DNS, 0},
1141     {receive_mesh_answer, GNUNET_MESSAGE_TYPE_REMOTE_ANSWER_DNS, 0},
1142     {NULL, 0, 0}
1143   };
1144
1145   static GNUNET_MESH_ApplicationType *apptypes;
1146
1147   if (GNUNET_YES ==
1148       GNUNET_CONFIGURATION_get_value_yesno (cfg_, "dns", "PROVIDE_EXIT"))
1149     apptypes = (GNUNET_MESH_ApplicationType[])
1150     {
1151     GNUNET_APPLICATION_TYPE_INTERNET_RESOLVER,
1152     GNUNET_APPLICATION_TYPE_END};
1153   else
1154   apptypes = (GNUNET_MESH_ApplicationType[])
1155   {
1156   GNUNET_APPLICATION_TYPE_END};
1157
1158   mesh_handle =
1159     GNUNET_MESH_connect (cfg_, NULL, NULL, mesh_handlers, apptypes);
1160
1161   cfg = cfg_;
1162
1163   unsigned int i;
1164   for (i = 0; i < 65536; i++)
1165     {
1166       query_states[i].valid = GNUNET_NO;
1167     }
1168
1169   dht = GNUNET_DHT_connect (cfg, 1024);
1170
1171   open_port ();
1172
1173   GNUNET_SCHEDULER_add_now (publish_names, NULL);
1174
1175   GNUNET_SERVER_add_handlers (server, handlers);
1176   GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
1177                                 &cleanup_task, cls);
1178 }
1179
1180 /**
1181  * The main function for the dns service.
1182  *
1183  * @param argc number of arguments from the command line
1184  * @param argv command line arguments
1185  * @return 0 ok, 1 on error
1186  */
1187 int
1188 main (int argc, char *const *argv)
1189 {
1190   return (GNUNET_OK ==
1191           GNUNET_SERVICE_run (argc,
1192                               argv,
1193                               "dns",
1194                               GNUNET_SERVICE_OPTION_NONE,
1195                               &run, NULL)) ? 0 : 1;
1196 }