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  * The handle to the service-configuration
  68  */
  69 static struct GNUNET_CONFIGURATION_Handle *servicecfg;
  70
  71 /**
  72  * A list of DNS-Responses that have to be sent to the requesting client
  73  */
  74 static struct answer_packet_list *head;
  75
  76 /**
  77  * The tail of the list of DNS-responses
  78  */
  79 static struct answer_packet_list *tail;
  80
  81 /**
  82  * A structure containing a mapping from network-byte-ordered DNS-id (16 bit) to
  83  * some information needed to handle this query
  84  *
  85  * It currently allocates at least
  86  * (1 + machine-width + machine-width + 32 + 32 + 16 + machine-width + 8) * 65536 bit
  87  * = 17 MiB on 64 bit.
  88  * = 11 MiB on 32 bit.
  89  */
  90 static struct {
  91     unsigned valid:1;
  92     struct GNUNET_SERVER_Client* client;
  93     struct GNUNET_MESH_Tunnel *tunnel;
  94     uint32_t local_ip;
  95     uint32_t remote_ip;
  96     uint16_t local_port;
  97     char* name;
  98     uint8_t namelen;
  99 } query_states[UINT16_MAX];
 100
 101 /**
 102  * A struct used to give more than one value as
 103  * closure to receive_dht
 104  */
 105 struct receive_dht_cls {
 106     uint16_t id;
 107     struct GNUNET_DHT_GetHandle* handle;
 108 };
 109
 110 /**
 111  * Hijack all outgoing DNS-Traffic but for traffic leaving "our" port.
 112  */
 113 static void
 114 hijack (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
 115 {
 116   char port_s[6];
 117   char *virt_dns;
 118   struct GNUNET_OS_Process *proc;
 119
 120   if (GNUNET_SYSERR ==
 121       GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "VIRTDNS",
 122                                              &virt_dns))
 123     {
 124       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 125                   "No entry 'VIRTDNS' in configuration!\n");
 126       exit (1);
 127     }
 128
 129   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Hijacking, port is %d\n", dnsoutport);
 130   snprintf (port_s, 6, "%d", dnsoutport);
 131   if (NULL != (proc = GNUNET_OS_start_process (NULL,
 132                                                NULL,
 133                                                "gnunet-helper-hijack-dns",
 134                                                "gnunet-hijack-dns",
 135                                                port_s, virt_dns, NULL)))
 136     GNUNET_OS_process_close (proc);
 137   GNUNET_free (virt_dns);
 138 }
 139
 140 /**
 141  * Delete the hijacking-routes
 142  */
 143 static void
 144 unhijack (unsigned short port)
 145 {
 146   char port_s[6];
 147   char *virt_dns;
 148   struct GNUNET_OS_Process *proc;
 149
 150   if (GNUNET_SYSERR ==
 151       GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "VIRTDNS",
 152                                              &virt_dns))
 153     {
 154       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 155                   "No entry 'VIRTDNS' in configuration!\n");
 156       exit (1);
 157     }
 158
 159   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "unHijacking, port is %d\n", port);
 160   snprintf (port_s, 6, "%d", port);
 161   if (NULL != (proc = GNUNET_OS_start_process (NULL,
 162                                                NULL,
 163                                                "gnunet-helper-hijack-dns",
 164                                                "gnunet-hijack-dns",
 165                                                "-d", port_s, virt_dns, NULL)))
 166     GNUNET_OS_process_close (proc);
 167   GNUNET_free (virt_dns);
 168 }
 169
 170 /**
 171  * Send the DNS-Response to the client. Gets called via the notify_transmit_ready-
 172  * system.
 173  */
 174 static size_t
 175 send_answer(void* cls, size_t size, void* buf) {
 176     struct answer_packet_list* query = head;
 177     size_t len = ntohs(query->pkt.hdr.size);
 178
 179     GNUNET_assert(len <= size);
 180
 181     memcpy(buf, &query->pkt.hdr, len);
 182
 183     GNUNET_CONTAINER_DLL_remove (head, tail, query);
 184
 185     GNUNET_free(query);
 186
 187     /* When more data is to be sent, reschedule */
 188     if (head != NULL)
 189       GNUNET_SERVER_notify_transmit_ready(cls,
 190                                           ntohs(head->pkt.hdr.size),
 191                                           GNUNET_TIME_UNIT_FOREVER_REL,
 192                                           &send_answer,
 193                                           cls);
 194
 195     return len;
 196 }
 197
 198 struct tunnel_cls {
 199     struct GNUNET_MESH_Tunnel *tunnel;
 200     struct GNUNET_MessageHeader hdr;
 201     struct dns_pkt dns;
 202 };
 203
 204 struct tunnel_cls *remote_pending[UINT16_MAX];
 205
 206 static size_t
 207 mesh_send_response (void *cls, size_t size, void *buf)
 208 {
 209   GNUNET_assert (size >= sizeof (struct GNUNET_MessageHeader));
 210   struct GNUNET_MessageHeader *hdr = buf;
 211   uint32_t *sz = cls;
 212   struct dns_pkt *dns = (struct dns_pkt *) (sz + 1);
 213   hdr->type = htons (GNUNET_MESSAGE_TYPE_REMOTE_ANSWER_DNS);
 214   hdr->size = htons (*sz + sizeof (struct GNUNET_MessageHeader));
 215
 216   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 217               "Sending response, size=%d, sz=%d, sz+hdr=%d\n", size, *sz,
 218               *sz + sizeof (struct GNUNET_MessageHeader));
 219
 220   GNUNET_assert (size >= (*sz + sizeof (struct GNUNET_MessageHeader)));
 221
 222   memcpy (hdr + 1, dns, *sz);
 223   GNUNET_free (cls);
 224   return ntohs (hdr->size);
 225 }
 226
 227 static size_t
 228 mesh_send (void *cls, size_t size, void *buf)
 229 {
 230   struct tunnel_cls *cls_ = (struct tunnel_cls *) cls;
 231
 232   GNUNET_assert(cls_->hdr.size <= size);
 233
 234   size = cls_->hdr.size;
 235   cls_->hdr.size = htons(cls_->hdr.size);
 236
 237   memcpy(buf, &cls_->hdr, size);
 238   return size;
 239 }
 240
 241
 242 void mesh_connect (void* cls, const struct GNUNET_PeerIdentity* peer, const struct GNUNET_TRANSPORT_ATS_Information *atsi) {
 243   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Connected to peer %x\n", *((unsigned long*)peer));
 244   struct tunnel_cls *cls_ = (struct tunnel_cls*)cls;
 245
 246   GNUNET_MESH_notify_transmit_ready(cls_->tunnel,
 247                                     GNUNET_YES,
 248                                     42,
 249                                     GNUNET_TIME_UNIT_MINUTES,
 250                                     NULL,
 251                                     cls_->hdr.size,
 252                                     mesh_send,
 253                                     cls);
 254 }
 255
 256
 257 static void
 258 send_mesh_query (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
 259 {
 260   if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
 261     return;
 262
 263   struct tunnel_cls *cls_ = (struct tunnel_cls*)cls;
 264
 265   cls_->tunnel = GNUNET_MESH_peer_request_connect_by_type(mesh_handle,
 266                                            GNUNET_TIME_UNIT_HOURS,
 267                                            GNUNET_APPLICATION_TYPE_INTERNET_RESOLVER,
 268                                            mesh_connect,
 269                                            NULL,
 270                                            cls_);
 271
 272   remote_pending[cls_->dns.s.id] = cls_;
 273 }
 274
 275 static int
 276 receive_mesh_query (void *cls,
 277                     struct GNUNET_MESH_Tunnel *tunnel,
 278                     void **ctx,
 279                     const struct GNUNET_PeerIdentity *sender,
 280                     const struct GNUNET_MessageHeader *message,
 281                     const struct GNUNET_TRANSPORT_ATS_Information *atsi)
 282 {
 283   struct dns_pkt *dns = (struct dns_pkt*)(message + 1);
 284
 285   struct sockaddr_in dest;
 286   memset(&dest, 0, sizeof dest);
 287   dest.sin_port = htons(53);
 288   /* TODO: read from config */
 289   inet_pton(AF_INET, "8.8.8.8", &dest.sin_addr);
 290
 291   query_states[dns->s.id].tunnel = tunnel;
 292   query_states[dns->s.id].valid = GNUNET_YES;
 293
 294   GNUNET_NETWORK_socket_sendto(dnsout,
 295                                dns,
 296                                ntohs(message->size) - sizeof(struct GNUNET_MessageHeader),
 297                                (struct sockaddr*) &dest,
 298                                sizeof dest);
 299
 300   return GNUNET_SYSERR;
 301 }
 302
 303 static int
 304 receive_mesh_answer (void *cls,
 305                      struct GNUNET_MESH_Tunnel *tunnel,
 306                      void **ctx,
 307                      const struct GNUNET_PeerIdentity *sender,
 308                      const struct GNUNET_MessageHeader *message,
 309                      const struct GNUNET_TRANSPORT_ATS_Information *atsi)
 310 {
 311   /* TODo: size check */
 312   struct dns_pkt *dns = (struct dns_pkt *) (message + 1);
 313
 314   /* They sent us a packet we were not waiting for */
 315   if (remote_pending[dns->s.id] == NULL
 316       || remote_pending[dns->s.id]->tunnel != tunnel)
 317     return GNUNET_SYSERR;
 318   if (query_states[dns->s.id].valid != GNUNET_YES)
 319     return GNUNET_SYSERR;
 320   query_states[dns->s.id].valid = GNUNET_NO;
 321
 322   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 */
 323     + sizeof (struct dns_record_line) - 1 + 16; /* To hold the IPv6-Address */
 324
 325   struct answer_packet_list *answer =
 326     GNUNET_malloc (len + 2 * sizeof (struct answer_packet_list *));
 327   memset (answer, 0, len + 2 * sizeof (struct answer_packet_list *));
 328
 329   answer->pkt.hdr.type = htons (GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 330   answer->pkt.hdr.size = htons (len);
 331   answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_REMOTE;
 332
 333   struct dns_pkt_parsed* pdns = parse_dns_packet(dns);
 334
 335   if (ntohs(pdns->s.ancount) < 1)
 336     {
 337       free_parsed_dns_packet(pdns);
 338       return GNUNET_OK;
 339     }
 340
 341   answer->pkt.addrsize = pdns->answers[0]->data_len;
 342   memcpy(answer->pkt.addr, pdns->answers[0]->data, ntohs(pdns->answers[0]->data_len));
 343
 344   answer->pkt.from = query_states[dns->s.id].remote_ip;
 345
 346   answer->pkt.to = query_states[dns->s.id].local_ip;
 347   answer->pkt.dst_port = query_states[dns->s.id].local_port;
 348
 349   struct dns_pkt *dpkt = (struct dns_pkt *) answer->pkt.data;
 350
 351   dpkt->s.id = dns->s.id;
 352   dpkt->s.aa = 1;
 353   dpkt->s.qr = 1;
 354   dpkt->s.ra = 1;
 355   dpkt->s.qdcount = htons (1);
 356   dpkt->s.ancount = htons (1);
 357
 358   memcpy (dpkt->data, query_states[dns->s.id].name,
 359           query_states[dns->s.id].namelen);
 360   GNUNET_free (query_states[dns->s.id].name);
 361
 362   struct dns_query_line *dque =
 363     (struct dns_query_line *) (dpkt->data +
 364                                (query_states[dns->s.id].namelen));
 365   dque->type = htons (28);      /* AAAA */
 366   dque->class = htons (1);      /* IN */
 367
 368   char *anname =
 369     (char *) (dpkt->data + (query_states[dns->s.id].namelen) +
 370               sizeof (struct dns_query_line));
 371   memcpy (anname, "\xc0\x0c", 2);
 372
 373   struct dns_record_line *drec_data =
 374     (struct dns_record_line *) (dpkt->data +
 375                                 (query_states[dns->s.id].namelen) +
 376                                 sizeof (struct dns_query_line) + 2);
 377   drec_data->type = htons (28); /* AAAA */
 378   drec_data->class = htons (1); /* IN */
 379
 380   drec_data->ttl = pdns->answers[0]->ttl;
 381   drec_data->data_len = htons (16);
 382
 383   /* Calculate at which offset in the packet the IPv6-Address belongs, it is
 384    * filled in by the daemon-vpn */
 385   answer->pkt.addroffset =
 386     htons ((unsigned short) ((unsigned long) (&drec_data->data) -
 387                              (unsigned long) (&answer->pkt)));
 388
 389   GNUNET_CONTAINER_DLL_insert_after (head, tail, tail, answer);
 390
 391   GNUNET_SERVER_notify_transmit_ready (query_states[dns->s.id].client,
 392                                        len,
 393                                        GNUNET_TIME_UNIT_FOREVER_REL,
 394                                        &send_answer,
 395                                        query_states[dns->s.id].client);
 396
 397   free_parsed_dns_packet(pdns);
 398   return GNUNET_OK;
 399 }
 400
 401
 402 static void
 403 send_rev_query(void * cls, const struct GNUNET_SCHEDULER_TaskContext *tc) {
 404     if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
 405       return;
 406
 407     struct dns_pkt_parsed* pdns = (struct dns_pkt_parsed*) cls;
 408
 409     unsigned short id = pdns->s.id;
 410
 411     free_parsed_dns_packet(pdns);
 412
 413     if (query_states[id].valid != GNUNET_YES) return;
 414     query_states[id].valid = GNUNET_NO;
 415
 416     GNUNET_assert(query_states[id].namelen == 74);
 417
 418     size_t len = sizeof(struct answer_packet) - 1 \
 419                  + sizeof(struct dns_static) \
 420                  + 74 /* this is the length of a reverse ipv6-lookup */ \
 421                  + sizeof(struct dns_query_line) \
 422                  + 2 /* To hold the pointer (as defined in RFC1035) to the name */ \
 423                  + sizeof(struct dns_record_line) - 1 \
 424                  - 2 /* We do not know the lenght of the answer yet*/;
 425
 426     struct answer_packet_list* answer = GNUNET_malloc(len + 2*sizeof(struct answer_packet_list*));
 427     memset(answer, 0, len + 2*sizeof(struct answer_packet_list*));
 428
 429     answer->pkt.hdr.type = htons(GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 430     answer->pkt.hdr.size = htons(len);
 431     answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_REV;
 432
 433     answer->pkt.from = query_states[id].remote_ip;
 434
 435     answer->pkt.to = query_states[id].local_ip;
 436     answer->pkt.dst_port = query_states[id].local_port;
 437
 438     struct dns_pkt *dpkt = (struct dns_pkt*)answer->pkt.data;
 439
 440     dpkt->s.id = id;
 441     dpkt->s.aa = 1;
 442     dpkt->s.qr = 1;
 443     dpkt->s.ra = 1;
 444     dpkt->s.qdcount = htons(1);
 445     dpkt->s.ancount = htons(1);
 446
 447     memcpy(dpkt->data, query_states[id].name, query_states[id].namelen);
 448     GNUNET_free(query_states[id].name);
 449
 450     struct dns_query_line* dque = (struct dns_query_line*)(dpkt->data+(query_states[id].namelen));
 451     dque->type = htons(12); /* PTR */
 452     dque->class = htons(1); /* IN */
 453
 454     char* anname = (char*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line));
 455     memcpy(anname, "\xc0\x0c", 2);
 456
 457     struct dns_record_line *drec_data = (struct dns_record_line*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line)+2);
 458     drec_data->type = htons(12); /* AAAA */
 459     drec_data->class = htons(1); /* IN */
 460     /* FIXME: read the TTL from block:
 461      * GNUNET_TIME_absolute_get_remaining(rec->expiration_time)
 462      *
 463      * But how to get the seconds out of this?
 464      */
 465     drec_data->ttl = htonl(3600);
 466
 467     /* Calculate at which offset in the packet the length of the name and the
 468      * name, it is filled in by the daemon-vpn */
 469     answer->pkt.addroffset = htons((unsigned short)((unsigned long)(&drec_data->data_len)-(unsigned long)(&answer->pkt)));
 470
 471     GNUNET_CONTAINER_DLL_insert_after(head, tail, tail, answer);
 472
 473     GNUNET_SERVER_notify_transmit_ready(query_states[id].client,
 474                                         len,
 475                                         GNUNET_TIME_UNIT_FOREVER_REL,
 476                                         &send_answer,
 477                                         query_states[id].client);
 478 }
 479
 480 /**
 481  * Receive a block from the dht.
 482  */
 483 static void
 484 receive_dht(void *cls,
 485             struct GNUNET_TIME_Absolute exp,
 486             const GNUNET_HashCode *key,
 487             const struct GNUNET_PeerIdentity *const *get_path,
 488             const struct GNUNET_PeerIdentity *const *put_path,
 489             enum GNUNET_BLOCK_Type type,
 490             size_t size,
 491             const void *data) {
 492
 493     unsigned short id = ((struct receive_dht_cls*)cls)->id;
 494     struct GNUNET_DHT_GetHandle* handle = ((struct receive_dht_cls*)cls)->handle;
 495     GNUNET_free(cls);
 496
 497     GNUNET_assert(type == GNUNET_BLOCK_TYPE_DNS);
 498
 499     /* If no query with this id is pending, ignore the block */
 500     if (query_states[id].valid != GNUNET_YES) return;
 501     query_states[id].valid = GNUNET_NO;
 502
 503     const struct GNUNET_DNS_Record* rec = data;
 504     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 505                "Got block of size %d, peer: %08x, desc: %08x\n",
 506                size,
 507                *((unsigned int*)&rec->peer),
 508                *((unsigned int*)&rec->service_descriptor));
 509
 510     size_t len = sizeof(struct answer_packet) - 1 \
 511                  + sizeof(struct dns_static) \
 512                  + query_states[id].namelen \
 513                  + sizeof(struct dns_query_line) \
 514                  + 2 /* To hold the pointer (as defined in RFC1035) to the name */ \
 515                  + sizeof(struct dns_record_line) - 1 \
 516                  + 16; /* To hold the IPv6-Address */
 517
 518     struct answer_packet_list* answer = GNUNET_malloc(len + 2*sizeof(struct answer_packet_list*));
 519     memset(answer, 0, len + 2*sizeof(struct answer_packet_list*));
 520
 521     answer->pkt.hdr.type = htons(GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 522     answer->pkt.hdr.size = htons(len);
 523     answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_SERVICE;
 524
 525     GNUNET_CRYPTO_hash(&rec->peer,
 526                        sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
 527                        &answer->pkt.service_descr.peer);
 528
 529     memcpy(&answer->pkt.service_descr.service_descriptor,
 530            &rec->service_descriptor,
 531            sizeof(GNUNET_HashCode));
 532     memcpy(&answer->pkt.service_descr.service_type,
 533            &rec->service_type,
 534            sizeof(answer->pkt.service_descr.service_type));
 535     memcpy(&answer->pkt.service_descr.ports, &rec->ports, sizeof(answer->pkt.service_descr.ports));
 536
 537     answer->pkt.from = query_states[id].remote_ip;
 538
 539     answer->pkt.to = query_states[id].local_ip;
 540     answer->pkt.dst_port = query_states[id].local_port;
 541
 542     struct dns_pkt *dpkt = (struct dns_pkt*)answer->pkt.data;
 543
 544     dpkt->s.id = id;
 545     dpkt->s.aa = 1;
 546     dpkt->s.qr = 1;
 547     dpkt->s.ra = 1;
 548     dpkt->s.qdcount = htons(1);
 549     dpkt->s.ancount = htons(1);
 550
 551     memcpy(dpkt->data, query_states[id].name, query_states[id].namelen);
 552     GNUNET_free(query_states[id].name);
 553
 554     struct dns_query_line* dque = (struct dns_query_line*)(dpkt->data+(query_states[id].namelen));
 555     dque->type = htons(28); /* AAAA */
 556     dque->class = htons(1); /* IN */
 557
 558     char* anname = (char*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line));
 559     memcpy(anname, "\xc0\x0c", 2);
 560
 561     struct dns_record_line *drec_data = (struct dns_record_line*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line)+2);
 562     drec_data->type = htons(28); /* AAAA */
 563     drec_data->class = htons(1); /* IN */
 564
 565     /* FIXME: read the TTL from block:
 566      * GNUNET_TIME_absolute_get_remaining(rec->expiration_time)
 567      *
 568      * But how to get the seconds out of this?
 569      */
 570     drec_data->ttl = htonl(3600);
 571     drec_data->data_len = htons(16);
 572
 573     /* Calculate at which offset in the packet the IPv6-Address belongs, it is
 574      * filled in by the daemon-vpn */
 575     answer->pkt.addroffset = htons((unsigned short)((unsigned long)(&drec_data->data)-(unsigned long)(&answer->pkt)));
 576
 577     GNUNET_CONTAINER_DLL_insert_after(head, tail, tail, answer);
 578
 579     GNUNET_SERVER_notify_transmit_ready(query_states[id].client,
 580                                         len,
 581                                         GNUNET_TIME_UNIT_FOREVER_REL,
 582                                         &send_answer,
 583                                         query_states[id].client);
 584
 585     GNUNET_DHT_get_stop(handle);
 586 }
 587
 588 /**
 589  * This receives a GNUNET_MESSAGE_TYPE_REHIJACK and rehijacks the DNS
 590  */
 591 static void
 592 rehijack(void *cls,
 593          struct GNUNET_SERVER_Client *client,
 594          const struct GNUNET_MessageHeader *message) {
 595     unhijack(dnsoutport);
 596     GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_UNIT_SECONDS, hijack, NULL);
 597
 598     GNUNET_SERVER_receive_done(client, GNUNET_OK);
 599 }
 600
 601 /**
 602  * This receives the dns-payload from the daemon-vpn and sends it on over the udp-socket
 603  */
 604 static void
 605 receive_query(void *cls,
 606               struct GNUNET_SERVER_Client *client,
 607               const struct GNUNET_MessageHeader *message) {
 608     struct query_packet* pkt = (struct query_packet*)message;
 609     struct dns_pkt* dns = (struct dns_pkt*)pkt->data;
 610     struct dns_pkt_parsed* pdns = parse_dns_packet(dns);
 611
 612     query_states[dns->s.id].valid = GNUNET_YES;
 613     query_states[dns->s.id].client = client;
 614     query_states[dns->s.id].local_ip = pkt->orig_from;
 615     query_states[dns->s.id].local_port = pkt->src_port;
 616     query_states[dns->s.id].remote_ip = pkt->orig_to;
 617     query_states[dns->s.id].namelen = strlen((char*)dns->data) + 1;
 618     query_states[dns->s.id].name = GNUNET_malloc(query_states[dns->s.id].namelen);
 619     memcpy(query_states[dns->s.id].name, dns->data, query_states[dns->s.id].namelen);
 620
 621     /* The query is for a .gnunet-address */
 622     if (pdns->queries[0]->namelen > 9 &&
 623         0 == strncmp(pdns->queries[0]->name+(pdns->queries[0]->namelen - 9), ".gnunet.", 9))
 624       {
 625         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Query for .gnunet!\n");
 626         GNUNET_HashCode key;
 627         GNUNET_CRYPTO_hash(pdns->queries[0]->name, pdns->queries[0]->namelen, &key);
 628
 629         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 630                    "Getting with key %08x, len is %d\n",
 631                    *((unsigned int*)&key),
 632                    pdns->queries[0]->namelen);
 633
 634         struct receive_dht_cls* cls = GNUNET_malloc(sizeof(struct receive_dht_cls));
 635         cls->id = dns->s.id;
 636
 637         cls->handle = GNUNET_DHT_get_start(dht,
 638                                            GNUNET_TIME_UNIT_MINUTES,
 639                                            GNUNET_BLOCK_TYPE_DNS,
 640                                            &key,
 641                                            DEFAULT_GET_REPLICATION,
 642                                            GNUNET_DHT_RO_NONE,
 643                                            NULL,
 644                                            0,
 645                                            NULL,
 646                                            0,
 647                                            receive_dht,
 648                                            cls);
 649
 650         goto outfree;
 651       }
 652
 653     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Query for '%s'; namelen=%d\n", pdns->queries[0]->name, pdns->queries[0]->namelen);
 654
 655     /* This is a PTR-Query. Check if it is for "our" network */
 656     if (htons(pdns->queries[0]->qtype) == 12 &&
 657         74 == pdns->queries[0]->namelen)
 658       {
 659         char* ipv6addr;
 660         char ipv6[16];
 661         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.";
 662         unsigned int i;
 663         unsigned long long ipv6prefix;
 664         unsigned int comparelen;
 665
 666         GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_string(cfg, "vpn", "IPV6ADDR", &ipv6addr));
 667         inet_pton (AF_INET6, ipv6addr, ipv6);
 668         GNUNET_free(ipv6addr);
 669
 670         GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_number(cfg, "vpn", "IPV6PREFIX", &ipv6prefix));
 671         GNUNET_assert(ipv6prefix < 127);
 672         ipv6prefix = (ipv6prefix + 7)/8;
 673
 674         for (i = ipv6prefix; i < 16; i++)
 675           ipv6[i] = 0;
 676
 677         for (i = 0; i < 16; i++)
 678           {
 679             unsigned char c1 = ipv6[i] >> 4;
 680             unsigned char c2 = ipv6[i] & 0xf;
 681
 682             if (c1 <= 9)
 683               ipv6rev[62-(4*i)] = c1 + '0';
 684             else
 685               ipv6rev[62-(4*i)] = c1 + 87; /* 87 is the difference between 'a' and 10 */
 686
 687             if (c2 <= 9)
 688               ipv6rev[62-((4*i)+2)] = c2 + '0';
 689             else
 690               ipv6rev[62-((4*i)+2)] = c2 + 87;
 691           }
 692         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "My network is %s'.\n", ipv6rev);
 693         comparelen = 10 + 4*ipv6prefix;
 694         if(0 == strncmp(pdns->queries[0]->name+(pdns->queries[0]->namelen - comparelen),
 695                         ipv6rev + (74 - comparelen),
 696                         comparelen))
 697           {
 698             GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Reverse-Query for .gnunet!\n");
 699
 700             GNUNET_SCHEDULER_add_now(send_rev_query, pdns);
 701
 702             goto out;
 703           }
 704       }
 705
 706     char* virt_dns;
 707     int virt_dns_bytes;
 708     if (GNUNET_SYSERR ==
 709         GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "VIRTDNS",
 710                                                &virt_dns))
 711       {
 712         GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 713                     "No entry 'VIRTDNS' in configuration!\n");
 714         exit (1);
 715       }
 716
 717     if (1 != inet_pton (AF_INET, virt_dns, &virt_dns_bytes))
 718       {
 719         GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 720                     "Error parsing 'VIRTDNS': %s; %m!\n", virt_dns);
 721         exit(1);
 722       }
 723
 724     GNUNET_free(virt_dns);
 725
 726     if (virt_dns_bytes == pkt->orig_to)
 727       {
 728         /* This is a packet that was sent directly to the virtual dns-server
 729          *
 730          * This means we have to send this query over gnunet
 731          */
 732
 733         size_t size = sizeof(struct GNUNET_MESH_Tunnel*) + sizeof(struct GNUNET_MessageHeader) + (ntohs(message->size) - sizeof(struct query_packet) + 1);
 734         struct tunnel_cls *cls_ =  GNUNET_malloc(size);
 735         cls_->hdr.size = size - sizeof(struct GNUNET_MESH_Tunnel*);
 736
 737         cls_->hdr.type = ntohs(GNUNET_MESSAGE_TYPE_REMOTE_QUERY_DNS);
 738         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "size: %d\n", size)
 739
 740         memcpy(&cls_->dns, dns, cls_->hdr.size);
 741         GNUNET_SCHEDULER_add_now(send_mesh_query, cls_);
 742
 743         goto out;
 744       }
 745
 746
 747     /* The query should be sent to the network */
 748
 749     struct sockaddr_in dest;
 750     memset(&dest, 0, sizeof dest);
 751     dest.sin_port = htons(53);
 752     dest.sin_addr.s_addr = pkt->orig_to;
 753
 754     GNUNET_NETWORK_socket_sendto(dnsout,
 755                                  dns,
 756                                  ntohs(pkt->hdr.size) - sizeof(struct query_packet) + 1,
 757                                  (struct sockaddr*) &dest,
 758                                  sizeof dest);
 759
 760 outfree:
 761     free_parsed_dns_packet(pdns);
 762     pdns = NULL;
 763 out:
 764     GNUNET_SERVER_receive_done(client, GNUNET_OK);
 765 }
 766
 767 static void read_response (void *cls,
 768                            const struct GNUNET_SCHEDULER_TaskContext *tc);
 769
 770 static void
 771 open_port ()
 772 {
 773   struct sockaddr_in addr;
 774
 775   dnsout = GNUNET_NETWORK_socket_create (AF_INET, SOCK_DGRAM, 0);
 776   if (dnsout == NULL)
 777     return;
 778   memset (&addr, 0, sizeof (struct sockaddr_in));
 779
 780   int err = GNUNET_NETWORK_socket_bind (dnsout,
 781                                         (struct sockaddr *) &addr,
 782                                         sizeof (struct sockaddr_in));
 783
 784   if (err != GNUNET_YES)
 785     {
 786       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 787                   "Could not bind a port, exiting\n");
 788       return;
 789     }
 790
 791   /* Read the port we bound to */
 792   socklen_t addrlen = sizeof (struct sockaddr_in);
 793   err = getsockname (GNUNET_NETWORK_get_fd (dnsout),
 794                      (struct sockaddr *) &addr, &addrlen);
 795
 796   dnsoutport = htons (addr.sin_port);
 797
 798   GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL, dnsout,
 799                                  &read_response, NULL);
 800 }
 801
 802 /**
 803  * Read a response-packet of the UDP-Socket
 804  */
 805 static void
 806 read_response (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
 807 {
 808   struct sockaddr_in addr;
 809   socklen_t addrlen = sizeof (addr);
 810   int r;
 811   int len;
 812
 813   if (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
 814     return;
 815
 816   memset (&addr, 0, sizeof addr);
 817
 818 #ifndef MINGW
 819   if (0 != ioctl (GNUNET_NETWORK_get_fd (dnsout), FIONREAD, &len))
 820     {
 821       unhijack (dnsoutport);
 822       open_port ();
 823       GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS, hijack, NULL);
 824       return;
 825     }
 826 #else
 827   /* port the code above? */
 828   len = 65536;
 829 #endif
 830   {
 831     unsigned char buf[len];
 832     struct dns_pkt *dns = (struct dns_pkt *) buf;
 833
 834     r = GNUNET_NETWORK_socket_recvfrom (dnsout,
 835                                         buf,
 836                                         sizeof (buf),
 837                                         (struct sockaddr *) &addr, &addrlen);
 838
 839     if (r < 0)
 840       {
 841         unhijack (dnsoutport);
 842         open_port ();
 843         GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS, hijack, NULL);
 844         return;
 845       }
 846
 847     if (query_states[dns->s.id].valid == GNUNET_YES)
 848       {
 849         if (query_states[dns->s.id].tunnel != NULL)
 850           {
 851             uint32_t *c = GNUNET_malloc(4 + r);
 852             *c = r;
 853             memcpy(c+1, dns, r);
 854             GNUNET_MESH_notify_transmit_ready (query_states[dns->s.id].tunnel,
 855                                                GNUNET_YES,
 856                                                32,
 857                                                GNUNET_TIME_UNIT_MINUTES,
 858                                                NULL, r + sizeof(struct GNUNET_MessageHeader), mesh_send_response, c);
 859           }
 860         else
 861           {
 862             query_states[dns->s.id].valid = GNUNET_NO;
 863
 864             size_t len = sizeof (struct answer_packet) + r - 1; /* 1 for the unsigned char data[1]; */
 865             struct answer_packet_list *answer =
 866               GNUNET_malloc (len + 2 * sizeof (struct answer_packet_list *));
 867             answer->pkt.hdr.type =
 868               htons (GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 869             answer->pkt.hdr.size = htons (len);
 870             answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_IP;
 871             answer->pkt.from = addr.sin_addr.s_addr;
 872             answer->pkt.to = query_states[dns->s.id].local_ip;
 873             answer->pkt.dst_port = query_states[dns->s.id].local_port;
 874             memcpy (answer->pkt.data, buf, r);
 875
 876             GNUNET_CONTAINER_DLL_insert_after (head, tail, tail, answer);
 877
 878             GNUNET_SERVER_notify_transmit_ready (query_states[dns->s.id].
 879                                                  client, len,
 880                                                  GNUNET_TIME_UNIT_FOREVER_REL,
 881                                                  &send_answer,
 882                                                  query_states[dns->s.id].
 883                                                  client);
 884           }
 885       }
 886   }
 887   GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
 888                                  dnsout, &read_response, NULL);
 889 }
 890
 891
 892 /**
 893  * Task run during shutdown.
 894  *
 895  * @param cls unused
 896  * @param tc unused
 897  */
 898 static void
 899 cleanup_task (void *cls,
 900               const struct GNUNET_SCHEDULER_TaskContext *tc)
 901 {
 902   unhijack(dnsoutport);
 903   GNUNET_DHT_disconnect(dht);
 904 }
 905
 906 /**
 907  * @brief Create a port-map from udp and tcp redirects
 908  *
 909  * @param udp_redirects
 910  * @param tcp_redirects
 911  *
 912  * @return
 913  */
 914 uint64_t
 915 get_port_from_redirects (const char *udp_redirects, const char *tcp_redirects)
 916 {
 917   uint64_t ret = 0;
 918   char* cpy, *hostname, *redirect;
 919   int local_port, count = 0;
 920
 921   if (NULL != udp_redirects)
 922     {
 923       cpy = GNUNET_strdup (udp_redirects);
 924       for (redirect = strtok (cpy, " "); redirect != NULL; redirect = strtok (NULL, " "))
 925         {
 926           if (NULL == (hostname = strstr (redirect, ":")))
 927             {
 928               GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: option %s is not formatted correctly!\n", redirect);
 929               continue;
 930             }
 931           hostname[0] = '\0';
 932           local_port = atoi (redirect);
 933           if (!((local_port > 0) && (local_port < 65536)))
 934             GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: %s is not a correct port.", redirect);
 935
 936           ret |= (0xFFFF & htons(local_port));
 937           ret <<= 16;
 938           count ++;
 939
 940           if(count > 4)
 941             {
 942               ret = 0;
 943               goto out;
 944             }
 945         }
 946       GNUNET_free(cpy);
 947       cpy = NULL;
 948     }
 949
 950   if (NULL != tcp_redirects)
 951     {
 952       cpy = GNUNET_strdup (tcp_redirects);
 953       for (redirect = strtok (cpy, " "); redirect != NULL; redirect = strtok (NULL, " "))
 954         {
 955           if (NULL == (hostname = strstr (redirect, ":")))
 956             {
 957               GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: option %s is not formatted correctly!\n", redirect);
 958               continue;
 959             }
 960           hostname[0] = '\0';
 961           local_port = atoi (redirect);
 962           if (!((local_port > 0) && (local_port < 65536)))
 963             GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: %s is not a correct port.", redirect);
 964
 965           ret |= (0xFFFF & htons(local_port));
 966           ret <<= 16;
 967           count ++;
 968
 969           if(count > 4)
 970             {
 971               ret = 0;
 972               goto out;
 973             }
 974         }
 975       GNUNET_free(cpy);
 976       cpy = NULL;
 977     }
 978
 979 out:
 980   if (NULL != cpy)
 981     GNUNET_free(cpy);
 982   return ret;
 983 }
 984
 985 void
 986 publish_name (const char *name, uint64_t ports, uint32_t service_type,
 987               struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key)
 988 {
 989   size_t size = sizeof (struct GNUNET_DNS_Record);
 990   struct GNUNET_DNS_Record data;
 991   memset (&data, 0, size);
 992
 993   data.purpose.size =
 994     htonl (size - sizeof (struct GNUNET_CRYPTO_RsaSignature));
 995   data.purpose.purpose = GNUNET_SIGNATURE_PURPOSE_DNS_RECORD;
 996
 997   GNUNET_CRYPTO_hash (name, strlen (name) + 1, &data.service_descriptor);
 998   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Store with key1 %x\n",
 999               *((unsigned long long *) &data.service_descriptor));
1000
1001   data.service_type = service_type;
1002   data.ports = ports;
1003
1004   GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &data.peer);
1005
1006   data.expiration_time =
1007     GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_HOURS, 2));
1008
1009   /* Sign the block */
1010   if (GNUNET_OK != GNUNET_CRYPTO_rsa_sign (my_private_key,
1011                                            &data.purpose, &data.signature))
1012     {
1013       GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "could not sign DNS_Record\n");
1014       return;
1015     }
1016
1017   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1018               "Putting with key %08x, size = %d\n",
1019               *((unsigned int *) &data.service_descriptor), size);
1020
1021   GNUNET_DHT_put (dht,
1022                   &data.service_descriptor,
1023                   DEFAULT_PUT_REPLICATION,
1024                   GNUNET_DHT_RO_NONE,
1025                   GNUNET_BLOCK_TYPE_DNS,
1026                   size,
1027                   (char *) &data,
1028                   GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_HOURS),
1029                   GNUNET_TIME_UNIT_MINUTES, NULL, NULL);
1030 }
1031
1032 /**
1033  * @brief Publishes the record defined by the section section
1034  *
1035  * @param cls closure
1036  * @param section the current section
1037  */
1038 void
1039 publish_iterate (void *cls, const char *section)
1040 {
1041   char *udp_redirects, *tcp_redirects, *alternative_names, *alternative_name,
1042     *keyfile;
1043
1044   GNUNET_CONFIGURATION_get_value_string (servicecfg, section,
1045                                          "UDP_REDIRECTS", &udp_redirects);
1046   GNUNET_CONFIGURATION_get_value_string (servicecfg, section, "TCP_REDIRECTS",
1047                                          &tcp_redirects);
1048
1049   if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (cfg, "GNUNETD",
1050                                                             "HOSTKEY",
1051                                                             &keyfile))
1052     {
1053       GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "could not read keyfile-value\n");
1054       if (keyfile != NULL)
1055         GNUNET_free (keyfile);
1056       return;
1057     }
1058
1059   struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key =
1060     GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
1061   GNUNET_free (keyfile);
1062   GNUNET_assert (my_private_key != NULL);
1063
1064   uint64_t ports = get_port_from_redirects (udp_redirects, tcp_redirects);
1065   uint32_t service_type = 0;
1066
1067   if (NULL != udp_redirects)
1068     service_type = GNUNET_DNS_SERVICE_TYPE_UDP;
1069
1070   if (NULL != tcp_redirects)
1071     service_type |= GNUNET_DNS_SERVICE_TYPE_TCP;
1072
1073   service_type = htonl (service_type);
1074
1075
1076   publish_name (section, ports, service_type, my_private_key);
1077
1078   GNUNET_CONFIGURATION_get_value_string (servicecfg, section,
1079                                          "ALTERNATIVE_NAMES",
1080                                          &alternative_names);
1081   for (alternative_name = strtok (alternative_names, " ");
1082        alternative_name != NULL; alternative_name = strtok (NULL, " "))
1083     {
1084       char *altname =
1085         alloca (strlen (alternative_name) + strlen (section) + 1 + 1);
1086       strcpy (altname, alternative_name);
1087       strcpy (altname + strlen (alternative_name) + 1, section);
1088       altname[strlen (alternative_name)] = '.';
1089
1090       publish_name (altname, ports, service_type, my_private_key);
1091     }
1092
1093   GNUNET_free_non_null(alternative_names);
1094   GNUNET_CRYPTO_rsa_key_free (my_private_key);
1095   GNUNET_free_non_null (udp_redirects);
1096   GNUNET_free_non_null (tcp_redirects);
1097 }
1098
1099 /**
1100  * Publish a DNS-record in the DHT. This is up to now just for testing.
1101  */
1102 static void
1103 publish_names (void *cls,
1104                const struct GNUNET_SCHEDULER_TaskContext *tc) {
1105     char *services;
1106     if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1107       return;
1108
1109     if (NULL != servicecfg)
1110       GNUNET_CONFIGURATION_destroy(servicecfg);
1111
1112     GNUNET_CONFIGURATION_get_value_filename(cfg, "dns", "SERVICES", &services);
1113
1114     servicecfg = GNUNET_CONFIGURATION_create();
1115     if (GNUNET_OK == GNUNET_CONFIGURATION_parse(servicecfg, services))
1116       {
1117         GNUNET_log(GNUNET_ERROR_TYPE_INFO, "Parsing services %s\n", services);
1118         GNUNET_CONFIGURATION_iterate_sections(servicecfg, publish_iterate, NULL);
1119       }
1120     if (NULL != services)
1121       GNUNET_free(services);
1122
1123     GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_HOURS,
1124                                   publish_names,
1125                                   NULL);
1126 }
1127
1128 /**
1129  * @param cls closure
1130  * @param server the initialized server
1131  * @param cfg_ configuration to use
1132  */
1133 static void
1134 run (void *cls,
1135      struct GNUNET_SERVER_Handle *server,
1136      const struct GNUNET_CONFIGURATION_Handle *cfg_)
1137 {
1138   static const struct GNUNET_SERVER_MessageHandler handlers[] = {
1139     /* callback, cls, type, size */
1140     {&receive_query, NULL, GNUNET_MESSAGE_TYPE_LOCAL_QUERY_DNS, 0},
1141     {&rehijack, NULL, GNUNET_MESSAGE_TYPE_REHIJACK,
1142      sizeof (struct GNUNET_MessageHeader)},
1143     {NULL, NULL, 0, 0}
1144   };
1145
1146   static struct GNUNET_MESH_MessageHandler *mesh_handlers;
1147
1148   if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno(cfg_, "dns", "PROVIDE_EXIT"))
1149     mesh_handlers = (struct GNUNET_MESH_MessageHandler[]) {
1150           {receive_mesh_query, GNUNET_MESSAGE_TYPE_REMOTE_QUERY_DNS, 0},
1151           {NULL, 0, 0}
1152     };
1153   else
1154     mesh_handlers = (struct GNUNET_MESH_MessageHandler[]) {
1155           {receive_mesh_answer, GNUNET_MESSAGE_TYPE_REMOTE_ANSWER_DNS, 0},
1156           {NULL, 0, 0}
1157     };
1158
1159   const static GNUNET_MESH_ApplicationType apptypes[] =
1160     { GNUNET_APPLICATION_TYPE_INTERNET_RESOLVER,
1161     GNUNET_APPLICATION_TYPE_END
1162   };
1163
1164   mesh_handle = GNUNET_MESH_connect (cfg_, NULL, NULL, mesh_handlers, apptypes);
1165
1166   cfg = cfg_;
1167
1168   unsigned int i;
1169   for (i = 0; i < 65536; i++)
1170     {
1171       query_states[i].valid = GNUNET_NO;
1172     }
1173
1174   dht = GNUNET_DHT_connect (cfg, 1024);
1175
1176   open_port ();
1177
1178   GNUNET_SCHEDULER_add_now (publish_names, NULL);
1179
1180   GNUNET_SERVER_add_handlers (server, handlers);
1181   GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
1182                                 &cleanup_task, cls);
1183 }
1184
1185 /**
1186  * The main function for the dns service.
1187  *
1188  * @param argc number of arguments from the command line
1189  * @param argv command line arguments
1190  * @return 0 ok, 1 on error
1191  */
1192 int
1193 main (int argc, char *const *argv)
1194 {
1195   return (GNUNET_OK ==
1196           GNUNET_SERVICE_run (argc,
1197                               argv,
1198                               "dns",
1199                               GNUNET_SERVICE_OPTION_NONE,
1200                               &run, NULL)) ? 0 : 1;
1201 }