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   struct tunnel_cls *cls_ = (struct tunnel_cls*)cls;
 243   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Connected to peer %s, sending query with id %d\n", GNUNET_i2s(peer), ntohs(cls_->dns.s.id));
 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,
 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   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Received answer from peer %s, dns-id %d\n", GNUNET_i2s(sender), ntohs(dns->s.id));
 322
 323   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 */
 324     + sizeof (struct dns_record_line) - 1 + 16; /* To hold the IPv6-Address */
 325
 326   struct answer_packet_list *answer =
 327     GNUNET_malloc (len + 2 * sizeof (struct answer_packet_list *));
 328   memset (answer, 0, len + 2 * sizeof (struct answer_packet_list *));
 329
 330   answer->pkt.hdr.type = htons (GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 331   answer->pkt.hdr.size = htons (len);
 332   answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_REMOTE;
 333
 334   struct dns_pkt_parsed* pdns = parse_dns_packet(dns);
 335
 336   if (ntohs(pdns->s.ancount) < 1)
 337     {
 338       GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Answer only contains %d answers.\n", ntohs(pdns->s.ancount));
 339       free_parsed_dns_packet(pdns);
 340       return GNUNET_OK;
 341     }
 342
 343   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "The first answer has the length %d\n", pdns->answers[0]->data_len);
 344   answer->pkt.addrsize = pdns->answers[0]->data_len;
 345   memcpy(answer->pkt.addr, pdns->answers[0]->data, ntohs(pdns->answers[0]->data_len));
 346
 347   answer->pkt.from = query_states[dns->s.id].remote_ip;
 348
 349   answer->pkt.to = query_states[dns->s.id].local_ip;
 350   answer->pkt.dst_port = query_states[dns->s.id].local_port;
 351
 352   struct dns_pkt *dpkt = (struct dns_pkt *) answer->pkt.data;
 353
 354   dpkt->s.id = dns->s.id;
 355   dpkt->s.aa = 1;
 356   dpkt->s.qr = 1;
 357   dpkt->s.ra = 1;
 358   dpkt->s.qdcount = htons (1);
 359   dpkt->s.ancount = htons (1);
 360
 361   memcpy (dpkt->data, query_states[dns->s.id].name,
 362           query_states[dns->s.id].namelen);
 363   GNUNET_free (query_states[dns->s.id].name);
 364
 365   struct dns_query_line *dque =
 366     (struct dns_query_line *) (dpkt->data +
 367                                (query_states[dns->s.id].namelen));
 368   dque->type = htons (28);      /* AAAA */
 369   dque->class = htons (1);      /* IN */
 370
 371   char *anname =
 372     (char *) (dpkt->data + (query_states[dns->s.id].namelen) +
 373               sizeof (struct dns_query_line));
 374   memcpy (anname, "\xc0\x0c", 2);
 375
 376   struct dns_record_line *drec_data =
 377     (struct dns_record_line *) (dpkt->data +
 378                                 (query_states[dns->s.id].namelen) +
 379                                 sizeof (struct dns_query_line) + 2);
 380   drec_data->type = htons (28); /* AAAA */
 381   drec_data->class = htons (1); /* IN */
 382
 383   drec_data->ttl = pdns->answers[0]->ttl;
 384   drec_data->data_len = htons (16);
 385
 386   /* Calculate at which offset in the packet the IPv6-Address belongs, it is
 387    * filled in by the daemon-vpn */
 388   answer->pkt.addroffset =
 389     htons ((unsigned short) ((unsigned long) (&drec_data->data) -
 390                              (unsigned long) (&answer->pkt)));
 391
 392   GNUNET_CONTAINER_DLL_insert_after (head, tail, tail, answer);
 393
 394   GNUNET_SERVER_notify_transmit_ready (query_states[dns->s.id].client,
 395                                        len,
 396                                        GNUNET_TIME_UNIT_FOREVER_REL,
 397                                        &send_answer,
 398                                        query_states[dns->s.id].client);
 399
 400   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Sent answer on to client\n");
 401
 402   free_parsed_dns_packet(pdns);
 403   return GNUNET_OK;
 404 }
 405
 406
 407 static void
 408 send_rev_query(void * cls, const struct GNUNET_SCHEDULER_TaskContext *tc) {
 409     if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
 410       return;
 411
 412     struct dns_pkt_parsed* pdns = (struct dns_pkt_parsed*) cls;
 413
 414     unsigned short id = pdns->s.id;
 415
 416     free_parsed_dns_packet(pdns);
 417
 418     if (query_states[id].valid != GNUNET_YES) return;
 419     query_states[id].valid = GNUNET_NO;
 420
 421     GNUNET_assert(query_states[id].namelen == 74);
 422
 423     size_t len = sizeof(struct answer_packet) - 1 \
 424                  + sizeof(struct dns_static) \
 425                  + 74 /* this is the length of a reverse ipv6-lookup */ \
 426                  + sizeof(struct dns_query_line) \
 427                  + 2 /* To hold the pointer (as defined in RFC1035) to the name */ \
 428                  + sizeof(struct dns_record_line) - 1 \
 429                  - 2 /* We do not know the lenght of the answer yet*/;
 430
 431     struct answer_packet_list* answer = GNUNET_malloc(len + 2*sizeof(struct answer_packet_list*));
 432     memset(answer, 0, len + 2*sizeof(struct answer_packet_list*));
 433
 434     answer->pkt.hdr.type = htons(GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 435     answer->pkt.hdr.size = htons(len);
 436     answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_REV;
 437
 438     answer->pkt.from = query_states[id].remote_ip;
 439
 440     answer->pkt.to = query_states[id].local_ip;
 441     answer->pkt.dst_port = query_states[id].local_port;
 442
 443     struct dns_pkt *dpkt = (struct dns_pkt*)answer->pkt.data;
 444
 445     dpkt->s.id = id;
 446     dpkt->s.aa = 1;
 447     dpkt->s.qr = 1;
 448     dpkt->s.ra = 1;
 449     dpkt->s.qdcount = htons(1);
 450     dpkt->s.ancount = htons(1);
 451
 452     memcpy(dpkt->data, query_states[id].name, query_states[id].namelen);
 453     GNUNET_free(query_states[id].name);
 454
 455     struct dns_query_line* dque = (struct dns_query_line*)(dpkt->data+(query_states[id].namelen));
 456     dque->type = htons(12); /* PTR */
 457     dque->class = htons(1); /* IN */
 458
 459     char* anname = (char*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line));
 460     memcpy(anname, "\xc0\x0c", 2);
 461
 462     struct dns_record_line *drec_data = (struct dns_record_line*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line)+2);
 463     drec_data->type = htons(12); /* AAAA */
 464     drec_data->class = htons(1); /* IN */
 465     /* FIXME: read the TTL from block:
 466      * GNUNET_TIME_absolute_get_remaining(rec->expiration_time)
 467      *
 468      * But how to get the seconds out of this?
 469      */
 470     drec_data->ttl = htonl(3600);
 471
 472     /* Calculate at which offset in the packet the length of the name and the
 473      * name, it is filled in by the daemon-vpn */
 474     answer->pkt.addroffset = htons((unsigned short)((unsigned long)(&drec_data->data_len)-(unsigned long)(&answer->pkt)));
 475
 476     GNUNET_CONTAINER_DLL_insert_after(head, tail, tail, answer);
 477
 478     GNUNET_SERVER_notify_transmit_ready(query_states[id].client,
 479                                         len,
 480                                         GNUNET_TIME_UNIT_FOREVER_REL,
 481                                         &send_answer,
 482                                         query_states[id].client);
 483 }
 484
 485 /**
 486  * Receive a block from the dht.
 487  */
 488 static void
 489 receive_dht(void *cls,
 490             struct GNUNET_TIME_Absolute exp __attribute__((unused)),
 491             const GNUNET_HashCode *key __attribute__((unused)),
 492             const struct GNUNET_PeerIdentity *const *get_path __attribute__((unused)),
 493             const struct GNUNET_PeerIdentity *const *put_path __attribute__((unused)),
 494             enum GNUNET_BLOCK_Type type,
 495             size_t size,
 496             const void *data) {
 497
 498     unsigned short id = ((struct receive_dht_cls*)cls)->id;
 499     struct GNUNET_DHT_GetHandle* handle = ((struct receive_dht_cls*)cls)->handle;
 500     GNUNET_free(cls);
 501
 502     GNUNET_assert(type == GNUNET_BLOCK_TYPE_DNS);
 503
 504     /* If no query with this id is pending, ignore the block */
 505     if (query_states[id].valid != GNUNET_YES) return;
 506     query_states[id].valid = GNUNET_NO;
 507
 508     const struct GNUNET_DNS_Record* rec = data;
 509     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 510                "Got block of size %d, peer: %08x, desc: %08x\n",
 511                size,
 512                *((unsigned int*)&rec->peer),
 513                *((unsigned int*)&rec->service_descriptor));
 514
 515     size_t len = sizeof(struct answer_packet) - 1 \
 516                  + sizeof(struct dns_static) \
 517                  + query_states[id].namelen \
 518                  + sizeof(struct dns_query_line) \
 519                  + 2 /* To hold the pointer (as defined in RFC1035) to the name */ \
 520                  + sizeof(struct dns_record_line) - 1 \
 521                  + 16; /* To hold the IPv6-Address */
 522
 523     struct answer_packet_list* answer = GNUNET_malloc(len + 2*sizeof(struct answer_packet_list*));
 524     memset(answer, 0, len + 2*sizeof(struct answer_packet_list*));
 525
 526     answer->pkt.hdr.type = htons(GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 527     answer->pkt.hdr.size = htons(len);
 528     answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_SERVICE;
 529
 530     GNUNET_CRYPTO_hash(&rec->peer,
 531                        sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
 532                        &answer->pkt.service_descr.peer);
 533
 534     memcpy(&answer->pkt.service_descr.service_descriptor,
 535            &rec->service_descriptor,
 536            sizeof(GNUNET_HashCode));
 537     memcpy(&answer->pkt.service_descr.service_type,
 538            &rec->service_type,
 539            sizeof(answer->pkt.service_descr.service_type));
 540     memcpy(&answer->pkt.service_descr.ports, &rec->ports, sizeof(answer->pkt.service_descr.ports));
 541
 542     answer->pkt.from = query_states[id].remote_ip;
 543
 544     answer->pkt.to = query_states[id].local_ip;
 545     answer->pkt.dst_port = query_states[id].local_port;
 546
 547     struct dns_pkt *dpkt = (struct dns_pkt*)answer->pkt.data;
 548
 549     dpkt->s.id = id;
 550     dpkt->s.aa = 1;
 551     dpkt->s.qr = 1;
 552     dpkt->s.ra = 1;
 553     dpkt->s.qdcount = htons(1);
 554     dpkt->s.ancount = htons(1);
 555
 556     memcpy(dpkt->data, query_states[id].name, query_states[id].namelen);
 557     GNUNET_free(query_states[id].name);
 558
 559     struct dns_query_line* dque = (struct dns_query_line*)(dpkt->data+(query_states[id].namelen));
 560     dque->type = htons(28); /* AAAA */
 561     dque->class = htons(1); /* IN */
 562
 563     char* anname = (char*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line));
 564     memcpy(anname, "\xc0\x0c", 2);
 565
 566     struct dns_record_line *drec_data = (struct dns_record_line*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line)+2);
 567     drec_data->type = htons(28); /* AAAA */
 568     drec_data->class = htons(1); /* IN */
 569
 570     /* FIXME: read the TTL from block:
 571      * GNUNET_TIME_absolute_get_remaining(rec->expiration_time)
 572      *
 573      * But how to get the seconds out of this?
 574      */
 575     drec_data->ttl = htonl(3600);
 576     drec_data->data_len = htons(16);
 577
 578     /* Calculate at which offset in the packet the IPv6-Address belongs, it is
 579      * filled in by the daemon-vpn */
 580     answer->pkt.addroffset = htons((unsigned short)((unsigned long)(&drec_data->data)-(unsigned long)(&answer->pkt)));
 581
 582     GNUNET_CONTAINER_DLL_insert_after(head, tail, tail, answer);
 583
 584     GNUNET_SERVER_notify_transmit_ready(query_states[id].client,
 585                                         len,
 586                                         GNUNET_TIME_UNIT_FOREVER_REL,
 587                                         &send_answer,
 588                                         query_states[id].client);
 589
 590     GNUNET_DHT_get_stop(handle);
 591 }
 592
 593 /**
 594  * This receives a GNUNET_MESSAGE_TYPE_REHIJACK and rehijacks the DNS
 595  */
 596 static void
 597 rehijack(void *cls __attribute__((unused)),
 598          struct GNUNET_SERVER_Client *client,
 599          const struct GNUNET_MessageHeader *message __attribute__((unused))) {
 600     unhijack(dnsoutport);
 601     GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_UNIT_SECONDS, hijack, NULL);
 602
 603     GNUNET_SERVER_receive_done(client, GNUNET_OK);
 604 }
 605
 606 /**
 607  * This receives the dns-payload from the daemon-vpn and sends it on over the udp-socket
 608  */
 609 static void
 610 receive_query(void *cls __attribute__((unused)),
 611               struct GNUNET_SERVER_Client *client,
 612               const struct GNUNET_MessageHeader *message) {
 613     struct query_packet* pkt = (struct query_packet*)message;
 614     struct dns_pkt* dns = (struct dns_pkt*)pkt->data;
 615     struct dns_pkt_parsed* pdns = parse_dns_packet(dns);
 616
 617     query_states[dns->s.id].valid = GNUNET_YES;
 618     query_states[dns->s.id].client = client;
 619     query_states[dns->s.id].local_ip = pkt->orig_from;
 620     query_states[dns->s.id].local_port = pkt->src_port;
 621     query_states[dns->s.id].remote_ip = pkt->orig_to;
 622     query_states[dns->s.id].namelen = strlen((char*)dns->data) + 1;
 623     query_states[dns->s.id].name = GNUNET_malloc(query_states[dns->s.id].namelen);
 624     memcpy(query_states[dns->s.id].name, dns->data, query_states[dns->s.id].namelen);
 625
 626     /* The query is for a .gnunet-address */
 627     if (pdns->queries[0]->namelen > 9 &&
 628         0 == strncmp(pdns->queries[0]->name+(pdns->queries[0]->namelen - 9), ".gnunet.", 9))
 629       {
 630         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Query for .gnunet!\n");
 631         GNUNET_HashCode key;
 632         GNUNET_CRYPTO_hash(pdns->queries[0]->name, pdns->queries[0]->namelen, &key);
 633
 634         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 635                    "Getting with key %08x, len is %d\n",
 636                    *((unsigned int*)&key),
 637                    pdns->queries[0]->namelen);
 638
 639         struct receive_dht_cls* cls = GNUNET_malloc(sizeof(struct receive_dht_cls));
 640         cls->id = dns->s.id;
 641
 642         cls->handle = GNUNET_DHT_get_start(dht,
 643                                            GNUNET_TIME_UNIT_MINUTES,
 644                                            GNUNET_BLOCK_TYPE_DNS,
 645                                            &key,
 646                                            DEFAULT_GET_REPLICATION,
 647                                            GNUNET_DHT_RO_NONE,
 648                                            NULL,
 649                                            0,
 650                                            NULL,
 651                                            0,
 652                                            receive_dht,
 653                                            cls);
 654
 655         goto outfree;
 656       }
 657
 658     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Query for '%s'; namelen=%d\n", pdns->queries[0]->name, pdns->queries[0]->namelen);
 659
 660     /* This is a PTR-Query. Check if it is for "our" network */
 661     if (htons(pdns->queries[0]->qtype) == 12 &&
 662         74 == pdns->queries[0]->namelen)
 663       {
 664         char* ipv6addr;
 665         char ipv6[16];
 666         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.";
 667         unsigned int i;
 668         unsigned long long ipv6prefix;
 669         unsigned int comparelen;
 670
 671         GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_string(cfg, "vpn", "IPV6ADDR", &ipv6addr));
 672         inet_pton (AF_INET6, ipv6addr, ipv6);
 673         GNUNET_free(ipv6addr);
 674
 675         GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_number(cfg, "vpn", "IPV6PREFIX", &ipv6prefix));
 676         GNUNET_assert(ipv6prefix < 127);
 677         ipv6prefix = (ipv6prefix + 7)/8;
 678
 679         for (i = ipv6prefix; i < 16; i++)
 680           ipv6[i] = 0;
 681
 682         for (i = 0; i < 16; i++)
 683           {
 684             unsigned char c1 = ipv6[i] >> 4;
 685             unsigned char c2 = ipv6[i] & 0xf;
 686
 687             if (c1 <= 9)
 688               ipv6rev[62-(4*i)] = c1 + '0';
 689             else
 690               ipv6rev[62-(4*i)] = c1 + 87; /* 87 is the difference between 'a' and 10 */
 691
 692             if (c2 <= 9)
 693               ipv6rev[62-((4*i)+2)] = c2 + '0';
 694             else
 695               ipv6rev[62-((4*i)+2)] = c2 + 87;
 696           }
 697         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "My network is %s'.\n", ipv6rev);
 698         comparelen = 10 + 4*ipv6prefix;
 699         if(0 == strncmp(pdns->queries[0]->name+(pdns->queries[0]->namelen - comparelen),
 700                         ipv6rev + (74 - comparelen),
 701                         comparelen))
 702           {
 703             GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Reverse-Query for .gnunet!\n");
 704
 705             GNUNET_SCHEDULER_add_now(send_rev_query, pdns);
 706
 707             goto out;
 708           }
 709       }
 710
 711     char* virt_dns;
 712     unsigned int virt_dns_bytes;
 713     if (GNUNET_SYSERR ==
 714         GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "VIRTDNS",
 715                                                &virt_dns))
 716       {
 717         GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 718                     "No entry 'VIRTDNS' in configuration!\n");
 719         exit (1);
 720       }
 721
 722     if (1 != inet_pton (AF_INET, virt_dns, &virt_dns_bytes))
 723       {
 724         GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 725                     "Error parsing 'VIRTDNS': %s; %m!\n", virt_dns);
 726         exit(1);
 727       }
 728
 729     GNUNET_free(virt_dns);
 730
 731     if (virt_dns_bytes == pkt->orig_to)
 732       {
 733         /* This is a packet that was sent directly to the virtual dns-server
 734          *
 735          * This means we have to send this query over gnunet
 736          */
 737
 738         size_t size = sizeof(struct GNUNET_MESH_Tunnel*) + sizeof(struct GNUNET_MessageHeader) + (ntohs(message->size) - sizeof(struct query_packet) + 1);
 739         struct tunnel_cls *cls_ =  GNUNET_malloc(size);
 740         cls_->hdr.size = size - sizeof(struct GNUNET_MESH_Tunnel*);
 741
 742         cls_->hdr.type = ntohs(GNUNET_MESSAGE_TYPE_REMOTE_QUERY_DNS);
 743         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "size: %d\n", size);
 744
 745         memcpy(&cls_->dns, dns, cls_->hdr.size - sizeof(struct GNUNET_MessageHeader));
 746         GNUNET_SCHEDULER_add_now(send_mesh_query, cls_);
 747
 748         goto out;
 749       }
 750
 751
 752     /* The query should be sent to the network */
 753
 754     struct sockaddr_in dest;
 755     memset(&dest, 0, sizeof dest);
 756     dest.sin_port = htons(53);
 757     dest.sin_addr.s_addr = pkt->orig_to;
 758
 759     GNUNET_NETWORK_socket_sendto(dnsout,
 760                                  dns,
 761                                  ntohs(pkt->hdr.size) - sizeof(struct query_packet) + 1,
 762                                  (struct sockaddr*) &dest,
 763                                  sizeof dest);
 764
 765 outfree:
 766     free_parsed_dns_packet(pdns);
 767     pdns = NULL;
 768 out:
 769     GNUNET_SERVER_receive_done(client, GNUNET_OK);
 770 }
 771
 772 static void read_response (void *cls,
 773                            const struct GNUNET_SCHEDULER_TaskContext *tc);
 774
 775 static void
 776 open_port ()
 777 {
 778   struct sockaddr_in addr;
 779
 780   dnsout = GNUNET_NETWORK_socket_create (AF_INET, SOCK_DGRAM, 0);
 781   if (dnsout == NULL)
 782     return;
 783   memset (&addr, 0, sizeof (struct sockaddr_in));
 784
 785   int err = GNUNET_NETWORK_socket_bind (dnsout,
 786                                         (struct sockaddr *) &addr,
 787                                         sizeof (struct sockaddr_in));
 788
 789   if (err != GNUNET_YES)
 790     {
 791       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 792                   "Could not bind a port, exiting\n");
 793       return;
 794     }
 795
 796   /* Read the port we bound to */
 797   socklen_t addrlen = sizeof (struct sockaddr_in);
 798   err = getsockname (GNUNET_NETWORK_get_fd (dnsout),
 799                      (struct sockaddr *) &addr, &addrlen);
 800
 801   dnsoutport = htons (addr.sin_port);
 802
 803   GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL, dnsout,
 804                                  &read_response, NULL);
 805 }
 806
 807 /**
 808  * Read a response-packet of the UDP-Socket
 809  */
 810 static void
 811 read_response (void *cls __attribute__((unused)), const struct GNUNET_SCHEDULER_TaskContext *tc)
 812 {
 813   struct sockaddr_in addr;
 814   socklen_t addrlen = sizeof (addr);
 815   int r;
 816   int len;
 817
 818   if (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
 819     return;
 820
 821   memset (&addr, 0, sizeof addr);
 822
 823 #ifndef MINGW
 824   if (0 != ioctl (GNUNET_NETWORK_get_fd (dnsout), FIONREAD, &len))
 825     {
 826       unhijack (dnsoutport);
 827       open_port ();
 828       GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS, hijack, NULL);
 829       return;
 830     }
 831 #else
 832   /* port the code above? */
 833   len = 65536;
 834 #endif
 835   {
 836     unsigned char buf[len];
 837     struct dns_pkt *dns = (struct dns_pkt *) buf;
 838
 839     r = GNUNET_NETWORK_socket_recvfrom (dnsout,
 840                                         buf,
 841                                         sizeof (buf),
 842                                         (struct sockaddr *) &addr, &addrlen);
 843
 844     if (r < 0)
 845       {
 846         unhijack (dnsoutport);
 847         open_port ();
 848         GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS, hijack, NULL);
 849         return;
 850       }
 851
 852     if (query_states[dns->s.id].valid == GNUNET_YES)
 853       {
 854         if (query_states[dns->s.id].tunnel != NULL)
 855           {
 856             uint32_t *c = GNUNET_malloc(4 + r);
 857             *c = r;
 858             memcpy(c+1, dns, r);
 859             GNUNET_MESH_notify_transmit_ready (query_states[dns->s.id].tunnel,
 860                                                GNUNET_YES,
 861                                                32,
 862                                                GNUNET_TIME_UNIT_MINUTES,
 863                                                NULL, r + sizeof(struct GNUNET_MessageHeader), mesh_send_response, c);
 864           }
 865         else
 866           {
 867             query_states[dns->s.id].valid = GNUNET_NO;
 868
 869             size_t len = sizeof (struct answer_packet) + r - 1; /* 1 for the unsigned char data[1]; */
 870             struct answer_packet_list *answer =
 871               GNUNET_malloc (len + 2 * sizeof (struct answer_packet_list *));
 872             answer->pkt.hdr.type =
 873               htons (GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 874             answer->pkt.hdr.size = htons (len);
 875             answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_IP;
 876             answer->pkt.from = addr.sin_addr.s_addr;
 877             answer->pkt.to = query_states[dns->s.id].local_ip;
 878             answer->pkt.dst_port = query_states[dns->s.id].local_port;
 879             memcpy (answer->pkt.data, buf, r);
 880
 881             GNUNET_CONTAINER_DLL_insert_after (head, tail, tail, answer);
 882
 883             GNUNET_SERVER_notify_transmit_ready (query_states[dns->s.id].
 884                                                  client, len,
 885                                                  GNUNET_TIME_UNIT_FOREVER_REL,
 886                                                  &send_answer,
 887                                                  query_states[dns->s.id].
 888                                                  client);
 889           }
 890       }
 891   }
 892   GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
 893                                  dnsout, &read_response, NULL);
 894 }
 895
 896
 897 /**
 898  * Task run during shutdown.
 899  *
 900  * @param cls unused
 901  * @param tc unused
 902  */
 903 static void
 904 cleanup_task (void *cls __attribute__((unused)),
 905               const struct GNUNET_SCHEDULER_TaskContext *tc)
 906 {
 907   GNUNET_assert(0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN));
 908
 909   unhijack(dnsoutport);
 910   GNUNET_DHT_disconnect(dht);
 911 }
 912
 913 /**
 914  * @brief Create a port-map from udp and tcp redirects
 915  *
 916  * @param udp_redirects
 917  * @param tcp_redirects
 918  *
 919  * @return
 920  */
 921 uint64_t
 922 get_port_from_redirects (const char *udp_redirects, const char *tcp_redirects)
 923 {
 924   uint64_t ret = 0;
 925   char* cpy, *hostname, *redirect;
 926   int local_port, count = 0;
 927
 928   if (NULL != udp_redirects)
 929     {
 930       cpy = GNUNET_strdup (udp_redirects);
 931       for (redirect = strtok (cpy, " "); redirect != NULL; redirect = strtok (NULL, " "))
 932         {
 933           if (NULL == (hostname = strstr (redirect, ":")))
 934             {
 935               GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: option %s is not formatted correctly!\n", redirect);
 936               continue;
 937             }
 938           hostname[0] = '\0';
 939           local_port = atoi (redirect);
 940           if (!((local_port > 0) && (local_port < 65536)))
 941             GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: %s is not a correct port.", redirect);
 942
 943           ret |= (0xFFFF & htons(local_port));
 944           ret <<= 16;
 945           count ++;
 946
 947           if(count > 4)
 948             {
 949               ret = 0;
 950               goto out;
 951             }
 952         }
 953       GNUNET_free(cpy);
 954       cpy = NULL;
 955     }
 956
 957   if (NULL != tcp_redirects)
 958     {
 959       cpy = GNUNET_strdup (tcp_redirects);
 960       for (redirect = strtok (cpy, " "); redirect != NULL; redirect = strtok (NULL, " "))
 961         {
 962           if (NULL == (hostname = strstr (redirect, ":")))
 963             {
 964               GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: option %s is not formatted correctly!\n", redirect);
 965               continue;
 966             }
 967           hostname[0] = '\0';
 968           local_port = atoi (redirect);
 969           if (!((local_port > 0) && (local_port < 65536)))
 970             GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: %s is not a correct port.", redirect);
 971
 972           ret |= (0xFFFF & htons(local_port));
 973           ret <<= 16;
 974           count ++;
 975
 976           if(count > 4)
 977             {
 978               ret = 0;
 979               goto out;
 980             }
 981         }
 982       GNUNET_free(cpy);
 983       cpy = NULL;
 984     }
 985
 986 out:
 987   if (NULL != cpy)
 988     GNUNET_free(cpy);
 989   return ret;
 990 }
 991
 992 void
 993 publish_name (const char *name, uint64_t ports, uint32_t service_type,
 994               struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key)
 995 {
 996   size_t size = sizeof (struct GNUNET_DNS_Record);
 997   struct GNUNET_DNS_Record data;
 998   memset (&data, 0, size);
 999
1000   data.purpose.size =
1001     htonl (size - sizeof (struct GNUNET_CRYPTO_RsaSignature));
1002   data.purpose.purpose = GNUNET_SIGNATURE_PURPOSE_DNS_RECORD;
1003
1004   GNUNET_CRYPTO_hash (name, strlen (name) + 1, &data.service_descriptor);
1005   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Store with key1 %x\n",
1006               *((unsigned long long *) &data.service_descriptor));
1007
1008   data.service_type = service_type;
1009   data.ports = ports;
1010
1011   GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &data.peer);
1012
1013   data.expiration_time =
1014     GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_HOURS, 2));
1015
1016   /* Sign the block */
1017   if (GNUNET_OK != GNUNET_CRYPTO_rsa_sign (my_private_key,
1018                                            &data.purpose, &data.signature))
1019     {
1020       GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "could not sign DNS_Record\n");
1021       return;
1022     }
1023
1024   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1025               "Putting with key %08x, size = %d\n",
1026               *((unsigned int *) &data.service_descriptor), size);
1027
1028   GNUNET_DHT_put (dht,
1029                   &data.service_descriptor,
1030                   DEFAULT_PUT_REPLICATION,
1031                   GNUNET_DHT_RO_NONE,
1032                   GNUNET_BLOCK_TYPE_DNS,
1033                   size,
1034                   (char *) &data,
1035                   GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_HOURS),
1036                   GNUNET_TIME_UNIT_MINUTES, NULL, NULL);
1037 }
1038
1039 /**
1040  * @brief Publishes the record defined by the section section
1041  *
1042  * @param cls closure
1043  * @param section the current section
1044  */
1045 void
1046 publish_iterate (void *cls __attribute__((unused)), const char *section)
1047 {
1048   if ((strlen(section) < 8) || (0 != strcmp (".gnunet.", section + (strlen(section) - 8))))
1049     return;
1050
1051   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Parsing dns-name %s\n", section);
1052
1053   char *udp_redirects, *tcp_redirects, *alternative_names, *alternative_name,
1054     *keyfile;
1055
1056   GNUNET_CONFIGURATION_get_value_string (cfg, section,
1057                                          "UDP_REDIRECTS", &udp_redirects);
1058   GNUNET_CONFIGURATION_get_value_string (cfg, section, "TCP_REDIRECTS",
1059                                          &tcp_redirects);
1060
1061   if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (cfg, "GNUNETD",
1062                                                             "HOSTKEY",
1063                                                             &keyfile))
1064     {
1065       GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "could not read keyfile-value\n");
1066       if (keyfile != NULL)
1067         GNUNET_free (keyfile);
1068       return;
1069     }
1070
1071   struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key =
1072     GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
1073   GNUNET_free (keyfile);
1074   GNUNET_assert (my_private_key != NULL);
1075
1076   uint64_t ports = get_port_from_redirects (udp_redirects, tcp_redirects);
1077   uint32_t service_type = 0;
1078
1079   if (NULL != udp_redirects)
1080     service_type = GNUNET_DNS_SERVICE_TYPE_UDP;
1081
1082   if (NULL != tcp_redirects)
1083     service_type |= GNUNET_DNS_SERVICE_TYPE_TCP;
1084
1085   service_type = htonl (service_type);
1086
1087
1088   publish_name (section, ports, service_type, my_private_key);
1089
1090   GNUNET_CONFIGURATION_get_value_string (cfg, section,
1091                                          "ALTERNATIVE_NAMES",
1092                                          &alternative_names);
1093   for (alternative_name = strtok (alternative_names, " ");
1094        alternative_name != NULL; alternative_name = strtok (NULL, " "))
1095     {
1096       char *altname =
1097         alloca (strlen (alternative_name) + strlen (section) + 1 + 1);
1098       strcpy (altname, alternative_name);
1099       strcpy (altname + strlen (alternative_name) + 1, section);
1100       altname[strlen (alternative_name)] = '.';
1101
1102       publish_name (altname, ports, service_type, my_private_key);
1103     }
1104
1105   GNUNET_free_non_null(alternative_names);
1106   GNUNET_CRYPTO_rsa_key_free (my_private_key);
1107   GNUNET_free_non_null (udp_redirects);
1108   GNUNET_free_non_null (tcp_redirects);
1109 }
1110
1111 /**
1112  * Publish a DNS-record in the DHT.
1113  */
1114 static void
1115 publish_names (void *cls __attribute__((unused)),
1116                const struct GNUNET_SCHEDULER_TaskContext *tc) {
1117     if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1118       return;
1119
1120     GNUNET_CONFIGURATION_iterate_sections(cfg, publish_iterate, NULL);
1121
1122     GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_HOURS,
1123                                   publish_names,
1124                                   NULL);
1125 }
1126
1127 /**
1128  * @param cls closure
1129  * @param server the initialized server
1130  * @param cfg_ configuration to use
1131  */
1132 static void
1133 run (void *cls,
1134      struct GNUNET_SERVER_Handle *server,
1135      const struct GNUNET_CONFIGURATION_Handle *cfg_)
1136 {
1137   static const struct GNUNET_SERVER_MessageHandler handlers[] = {
1138     /* callback, cls, type, size */
1139     {&receive_query, NULL, GNUNET_MESSAGE_TYPE_LOCAL_QUERY_DNS, 0},
1140     {&rehijack, NULL, GNUNET_MESSAGE_TYPE_REHIJACK,
1141      sizeof (struct GNUNET_MessageHeader)},
1142     {NULL, NULL, 0, 0}
1143   };
1144
1145   static const struct GNUNET_MESH_MessageHandler mesh_handlers[] = {
1146     {receive_mesh_query, GNUNET_MESSAGE_TYPE_REMOTE_QUERY_DNS, 0},
1147     {receive_mesh_answer, GNUNET_MESSAGE_TYPE_REMOTE_ANSWER_DNS, 0},
1148     {NULL, 0, 0}
1149   };
1150
1151   static GNUNET_MESH_ApplicationType *apptypes;
1152
1153   if (GNUNET_YES ==
1154       GNUNET_CONFIGURATION_get_value_yesno (cfg_, "dns", "PROVIDE_EXIT"))
1155     apptypes = (GNUNET_MESH_ApplicationType[])
1156     {
1157     GNUNET_APPLICATION_TYPE_INTERNET_RESOLVER,
1158     GNUNET_APPLICATION_TYPE_END};
1159   else
1160   apptypes = (GNUNET_MESH_ApplicationType[])
1161   {
1162   GNUNET_APPLICATION_TYPE_END};
1163
1164   mesh_handle =
1165     GNUNET_MESH_connect (cfg_, NULL, NULL, mesh_handlers, apptypes);
1166
1167   cfg = cfg_;
1168
1169   unsigned int i;
1170   for (i = 0; i < 65536; i++)
1171     {
1172       query_states[i].valid = GNUNET_NO;
1173     }
1174
1175   dht = GNUNET_DHT_connect (cfg, 1024);
1176
1177   open_port ();
1178
1179   GNUNET_SCHEDULER_add_now (publish_names, NULL);
1180
1181   GNUNET_SERVER_add_handlers (server, handlers);
1182   GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
1183                                 &cleanup_task, cls);
1184 }
1185
1186 /**
1187  * The main function for the dns service.
1188  *
1189  * @param argc number of arguments from the command line
1190  * @param argv command line arguments
1191  * @return 0 ok, 1 on error
1192  */
1193 int
1194 main (int argc, char *const *argv)
1195 {
1196   return (GNUNET_OK ==
1197           GNUNET_SERVICE_run (argc,
1198                               argv,
1199                               "dns",
1200                               GNUNET_SERVICE_OPTION_NONE,
1201                               &run, NULL)) ? 0 : 1;
1202 }