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 __attribute__((unused)), const struct GNUNET_SCHEDULER_TaskContext *tc)
 115 {
 116   if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
 117     return;
 118
 119   char port_s[6];
 120   char *virt_dns;
 121   struct GNUNET_OS_Process *proc;
 122
 123   if (GNUNET_SYSERR ==
 124       GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "VIRTDNS",
 125                                              &virt_dns))
 126     {
 127       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 128                   "No entry 'VIRTDNS' in configuration!\n");
 129       exit (1);
 130     }
 131
 132   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Hijacking, port is %d\n", dnsoutport);
 133   snprintf (port_s, 6, "%d", dnsoutport);
 134   if (NULL != (proc = GNUNET_OS_start_process (NULL,
 135                                                NULL,
 136                                                "gnunet-helper-hijack-dns",
 137                                                "gnunet-hijack-dns",
 138                                                port_s, virt_dns, NULL)))
 139     GNUNET_OS_process_close (proc);
 140   GNUNET_free (virt_dns);
 141 }
 142
 143 /**
 144  * Delete the hijacking-routes
 145  */
 146 static void
 147 unhijack (unsigned short port)
 148 {
 149   char port_s[6];
 150   char *virt_dns;
 151   struct GNUNET_OS_Process *proc;
 152
 153   if (GNUNET_SYSERR ==
 154       GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "VIRTDNS",
 155                                              &virt_dns))
 156     {
 157       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 158                   "No entry 'VIRTDNS' in configuration!\n");
 159       exit (1);
 160     }
 161
 162   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "unHijacking, port is %d\n", port);
 163   snprintf (port_s, 6, "%d", port);
 164   if (NULL != (proc = GNUNET_OS_start_process (NULL,
 165                                                NULL,
 166                                                "gnunet-helper-hijack-dns",
 167                                                "gnunet-hijack-dns",
 168                                                "-d", port_s, virt_dns, NULL)))
 169     GNUNET_OS_process_close (proc);
 170   GNUNET_free (virt_dns);
 171 }
 172
 173 /**
 174  * Send the DNS-Response to the client. Gets called via the notify_transmit_ready-
 175  * system.
 176  */
 177 static size_t
 178 send_answer(void* cls, size_t size, void* buf) {
 179     struct answer_packet_list* query = head;
 180     size_t len = ntohs(query->pkt.hdr.size);
 181
 182     GNUNET_assert(len <= size);
 183
 184     memcpy(buf, &query->pkt.hdr, len);
 185
 186     GNUNET_CONTAINER_DLL_remove (head, tail, query);
 187
 188     GNUNET_free(query);
 189
 190     /* When more data is to be sent, reschedule */
 191     if (head != NULL)
 192       GNUNET_SERVER_notify_transmit_ready(cls,
 193                                           ntohs(head->pkt.hdr.size),
 194                                           GNUNET_TIME_UNIT_FOREVER_REL,
 195                                           &send_answer,
 196                                           cls);
 197
 198     return len;
 199 }
 200
 201 struct tunnel_cls {
 202     struct GNUNET_MESH_Tunnel *tunnel GNUNET_PACKED;
 203     struct GNUNET_MessageHeader hdr;
 204     struct dns_pkt dns;
 205 };
 206
 207 struct tunnel_cls *remote_pending[UINT16_MAX];
 208
 209 static size_t
 210 mesh_send_response (void *cls, size_t size, void *buf)
 211 {
 212   GNUNET_assert (size >= sizeof (struct GNUNET_MessageHeader));
 213   struct GNUNET_MessageHeader *hdr = buf;
 214   uint32_t *sz = cls;
 215   struct dns_pkt *dns = (struct dns_pkt *) (sz + 1);
 216   hdr->type = htons (GNUNET_MESSAGE_TYPE_REMOTE_ANSWER_DNS);
 217   hdr->size = htons (*sz + sizeof (struct GNUNET_MessageHeader));
 218
 219   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 220               "Sending response, size=%d, sz=%d, sz+hdr=%d\n", size, *sz,
 221               *sz + sizeof (struct GNUNET_MessageHeader));
 222
 223   GNUNET_assert (size >= (*sz + sizeof (struct GNUNET_MessageHeader)));
 224
 225   memcpy (hdr + 1, dns, *sz);
 226   GNUNET_free (cls);
 227   return ntohs (hdr->size);
 228 }
 229
 230 static size_t
 231 mesh_send (void *cls, size_t size, void *buf)
 232 {
 233   struct tunnel_cls *cls_ = (struct tunnel_cls *) cls;
 234
 235   GNUNET_assert(cls_->hdr.size <= size);
 236
 237   size = cls_->hdr.size;
 238   cls_->hdr.size = htons(cls_->hdr.size);
 239
 240   memcpy(buf, &cls_->hdr, size);
 241   return size;
 242 }
 243
 244
 245 void mesh_connect (void* cls, const struct GNUNET_PeerIdentity* peer, const struct GNUNET_TRANSPORT_ATS_Information *atsi __attribute__((unused))) {
 246   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Connected to peer %x\n", *((unsigned long*)peer));
 247   struct tunnel_cls *cls_ = (struct tunnel_cls*)cls;
 248
 249   GNUNET_MESH_notify_transmit_ready(cls_->tunnel,
 250                                     GNUNET_YES,
 251                                     42,
 252                                     GNUNET_TIME_UNIT_MINUTES,
 253                                     NULL,
 254                                     cls_->hdr.size,
 255                                     mesh_send,
 256                                     cls);
 257 }
 258
 259
 260 static void
 261 send_mesh_query (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
 262 {
 263   if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
 264     return;
 265
 266   struct tunnel_cls *cls_ = (struct tunnel_cls*)cls;
 267
 268   cls_->tunnel = GNUNET_MESH_peer_request_connect_by_type(mesh_handle,
 269                                            GNUNET_TIME_UNIT_HOURS,
 270                                            GNUNET_APPLICATION_TYPE_INTERNET_RESOLVER,
 271                                            mesh_connect,
 272                                            NULL,
 273                                            cls_);
 274
 275   remote_pending[cls_->dns.s.id] = cls_;
 276 }
 277
 278 static int
 279 receive_mesh_query (void *cls __attribute__((unused)),
 280                     struct GNUNET_MESH_Tunnel *tunnel,
 281                     void **ctx __attribute__((unused)),
 282                     const struct GNUNET_PeerIdentity *sender __attribute__((unused)),
 283                     const struct GNUNET_MessageHeader *message,
 284                     const struct GNUNET_TRANSPORT_ATS_Information *atsi __attribute__((unused)))
 285 {
 286   struct dns_pkt *dns = (struct dns_pkt*)(message + 1);
 287
 288   struct sockaddr_in dest;
 289   memset(&dest, 0, sizeof dest);
 290   dest.sin_port = htons(53);
 291   /* TODO: read from config */
 292   inet_pton(AF_INET, "8.8.8.8", &dest.sin_addr);
 293
 294   query_states[dns->s.id].tunnel = tunnel;
 295   query_states[dns->s.id].valid = GNUNET_YES;
 296
 297   GNUNET_NETWORK_socket_sendto(dnsout,
 298                                dns,
 299                                ntohs(message->size) - sizeof(struct GNUNET_MessageHeader),
 300                                (struct sockaddr*) &dest,
 301                                sizeof dest);
 302
 303   return GNUNET_SYSERR;
 304 }
 305
 306 static int
 307 receive_mesh_answer (void *cls __attribute__((unused)),
 308                      struct GNUNET_MESH_Tunnel *tunnel,
 309                      void **ctx __attribute__((unused)),
 310                      const struct GNUNET_PeerIdentity *sender __attribute__((unused)),
 311                      const struct GNUNET_MessageHeader *message,
 312                      const struct GNUNET_TRANSPORT_ATS_Information *atsi __attribute__((unused)))
 313 {
 314   /* TODo: size check */
 315   struct dns_pkt *dns = (struct dns_pkt *) (message + 1);
 316
 317   /* They sent us a packet we were not waiting for */
 318   if (remote_pending[dns->s.id] == NULL
 319       || remote_pending[dns->s.id]->tunnel != tunnel)
 320     return GNUNET_SYSERR;
 321   if (query_states[dns->s.id].valid != GNUNET_YES)
 322     return GNUNET_SYSERR;
 323   query_states[dns->s.id].valid = GNUNET_NO;
 324
 325   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 */
 326     + sizeof (struct dns_record_line) - 1 + 16; /* To hold the IPv6-Address */
 327
 328   struct answer_packet_list *answer =
 329     GNUNET_malloc (len + 2 * sizeof (struct answer_packet_list *));
 330   memset (answer, 0, len + 2 * sizeof (struct answer_packet_list *));
 331
 332   answer->pkt.hdr.type = htons (GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 333   answer->pkt.hdr.size = htons (len);
 334   answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_REMOTE;
 335
 336   struct dns_pkt_parsed* pdns = parse_dns_packet(dns);
 337
 338   if (ntohs(pdns->s.ancount) < 1)
 339     {
 340       free_parsed_dns_packet(pdns);
 341       return GNUNET_OK;
 342     }
 343
 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   free_parsed_dns_packet(pdns);
 401   return GNUNET_OK;
 402 }
 403
 404
 405 static void
 406 send_rev_query(void * cls, const struct GNUNET_SCHEDULER_TaskContext *tc) {
 407     if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
 408       return;
 409
 410     struct dns_pkt_parsed* pdns = (struct dns_pkt_parsed*) cls;
 411
 412     unsigned short id = pdns->s.id;
 413
 414     free_parsed_dns_packet(pdns);
 415
 416     if (query_states[id].valid != GNUNET_YES) return;
 417     query_states[id].valid = GNUNET_NO;
 418
 419     GNUNET_assert(query_states[id].namelen == 74);
 420
 421     size_t len = sizeof(struct answer_packet) - 1 \
 422                  + sizeof(struct dns_static) \
 423                  + 74 /* this is the length of a reverse ipv6-lookup */ \
 424                  + sizeof(struct dns_query_line) \
 425                  + 2 /* To hold the pointer (as defined in RFC1035) to the name */ \
 426                  + sizeof(struct dns_record_line) - 1 \
 427                  - 2 /* We do not know the lenght of the answer yet*/;
 428
 429     struct answer_packet_list* answer = GNUNET_malloc(len + 2*sizeof(struct answer_packet_list*));
 430     memset(answer, 0, len + 2*sizeof(struct answer_packet_list*));
 431
 432     answer->pkt.hdr.type = htons(GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 433     answer->pkt.hdr.size = htons(len);
 434     answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_REV;
 435
 436     answer->pkt.from = query_states[id].remote_ip;
 437
 438     answer->pkt.to = query_states[id].local_ip;
 439     answer->pkt.dst_port = query_states[id].local_port;
 440
 441     struct dns_pkt *dpkt = (struct dns_pkt*)answer->pkt.data;
 442
 443     dpkt->s.id = id;
 444     dpkt->s.aa = 1;
 445     dpkt->s.qr = 1;
 446     dpkt->s.ra = 1;
 447     dpkt->s.qdcount = htons(1);
 448     dpkt->s.ancount = htons(1);
 449
 450     memcpy(dpkt->data, query_states[id].name, query_states[id].namelen);
 451     GNUNET_free(query_states[id].name);
 452
 453     struct dns_query_line* dque = (struct dns_query_line*)(dpkt->data+(query_states[id].namelen));
 454     dque->type = htons(12); /* PTR */
 455     dque->class = htons(1); /* IN */
 456
 457     char* anname = (char*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line));
 458     memcpy(anname, "\xc0\x0c", 2);
 459
 460     struct dns_record_line *drec_data = (struct dns_record_line*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line)+2);
 461     drec_data->type = htons(12); /* AAAA */
 462     drec_data->class = htons(1); /* IN */
 463     /* FIXME: read the TTL from block:
 464      * GNUNET_TIME_absolute_get_remaining(rec->expiration_time)
 465      *
 466      * But how to get the seconds out of this?
 467      */
 468     drec_data->ttl = htonl(3600);
 469
 470     /* Calculate at which offset in the packet the length of the name and the
 471      * name, it is filled in by the daemon-vpn */
 472     answer->pkt.addroffset = htons((unsigned short)((unsigned long)(&drec_data->data_len)-(unsigned long)(&answer->pkt)));
 473
 474     GNUNET_CONTAINER_DLL_insert_after(head, tail, tail, answer);
 475
 476     GNUNET_SERVER_notify_transmit_ready(query_states[id].client,
 477                                         len,
 478                                         GNUNET_TIME_UNIT_FOREVER_REL,
 479                                         &send_answer,
 480                                         query_states[id].client);
 481 }
 482
 483 /**
 484  * Receive a block from the dht.
 485  */
 486 static void
 487 receive_dht(void *cls,
 488             struct GNUNET_TIME_Absolute exp __attribute__((unused)),
 489             const GNUNET_HashCode *key __attribute__((unused)),
 490             const struct GNUNET_PeerIdentity *const *get_path __attribute__((unused)),
 491             const struct GNUNET_PeerIdentity *const *put_path __attribute__((unused)),
 492             enum GNUNET_BLOCK_Type type,
 493             size_t size,
 494             const void *data) {
 495
 496     unsigned short id = ((struct receive_dht_cls*)cls)->id;
 497     struct GNUNET_DHT_GetHandle* handle = ((struct receive_dht_cls*)cls)->handle;
 498     GNUNET_free(cls);
 499
 500     GNUNET_assert(type == GNUNET_BLOCK_TYPE_DNS);
 501
 502     /* If no query with this id is pending, ignore the block */
 503     if (query_states[id].valid != GNUNET_YES) return;
 504     query_states[id].valid = GNUNET_NO;
 505
 506     const struct GNUNET_DNS_Record* rec = data;
 507     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 508                "Got block of size %d, peer: %08x, desc: %08x\n",
 509                size,
 510                *((unsigned int*)&rec->peer),
 511                *((unsigned int*)&rec->service_descriptor));
 512
 513     size_t len = sizeof(struct answer_packet) - 1 \
 514                  + sizeof(struct dns_static) \
 515                  + query_states[id].namelen \
 516                  + sizeof(struct dns_query_line) \
 517                  + 2 /* To hold the pointer (as defined in RFC1035) to the name */ \
 518                  + sizeof(struct dns_record_line) - 1 \
 519                  + 16; /* To hold the IPv6-Address */
 520
 521     struct answer_packet_list* answer = GNUNET_malloc(len + 2*sizeof(struct answer_packet_list*));
 522     memset(answer, 0, len + 2*sizeof(struct answer_packet_list*));
 523
 524     answer->pkt.hdr.type = htons(GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 525     answer->pkt.hdr.size = htons(len);
 526     answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_SERVICE;
 527
 528     GNUNET_CRYPTO_hash(&rec->peer,
 529                        sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
 530                        &answer->pkt.service_descr.peer);
 531
 532     memcpy(&answer->pkt.service_descr.service_descriptor,
 533            &rec->service_descriptor,
 534            sizeof(GNUNET_HashCode));
 535     memcpy(&answer->pkt.service_descr.service_type,
 536            &rec->service_type,
 537            sizeof(answer->pkt.service_descr.service_type));
 538     memcpy(&answer->pkt.service_descr.ports, &rec->ports, sizeof(answer->pkt.service_descr.ports));
 539
 540     answer->pkt.from = query_states[id].remote_ip;
 541
 542     answer->pkt.to = query_states[id].local_ip;
 543     answer->pkt.dst_port = query_states[id].local_port;
 544
 545     struct dns_pkt *dpkt = (struct dns_pkt*)answer->pkt.data;
 546
 547     dpkt->s.id = id;
 548     dpkt->s.aa = 1;
 549     dpkt->s.qr = 1;
 550     dpkt->s.ra = 1;
 551     dpkt->s.qdcount = htons(1);
 552     dpkt->s.ancount = htons(1);
 553
 554     memcpy(dpkt->data, query_states[id].name, query_states[id].namelen);
 555     GNUNET_free(query_states[id].name);
 556
 557     struct dns_query_line* dque = (struct dns_query_line*)(dpkt->data+(query_states[id].namelen));
 558     dque->type = htons(28); /* AAAA */
 559     dque->class = htons(1); /* IN */
 560
 561     char* anname = (char*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line));
 562     memcpy(anname, "\xc0\x0c", 2);
 563
 564     struct dns_record_line *drec_data = (struct dns_record_line*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line)+2);
 565     drec_data->type = htons(28); /* AAAA */
 566     drec_data->class = htons(1); /* IN */
 567
 568     /* FIXME: read the TTL from block:
 569      * GNUNET_TIME_absolute_get_remaining(rec->expiration_time)
 570      *
 571      * But how to get the seconds out of this?
 572      */
 573     drec_data->ttl = htonl(3600);
 574     drec_data->data_len = htons(16);
 575
 576     /* Calculate at which offset in the packet the IPv6-Address belongs, it is
 577      * filled in by the daemon-vpn */
 578     answer->pkt.addroffset = htons((unsigned short)((unsigned long)(&drec_data->data)-(unsigned long)(&answer->pkt)));
 579
 580     GNUNET_CONTAINER_DLL_insert_after(head, tail, tail, answer);
 581
 582     GNUNET_SERVER_notify_transmit_ready(query_states[id].client,
 583                                         len,
 584                                         GNUNET_TIME_UNIT_FOREVER_REL,
 585                                         &send_answer,
 586                                         query_states[id].client);
 587
 588     GNUNET_DHT_get_stop(handle);
 589 }
 590
 591 /**
 592  * This receives a GNUNET_MESSAGE_TYPE_REHIJACK and rehijacks the DNS
 593  */
 594 static void
 595 rehijack(void *cls __attribute__((unused)),
 596          struct GNUNET_SERVER_Client *client,
 597          const struct GNUNET_MessageHeader *message __attribute__((unused))) {
 598     unhijack(dnsoutport);
 599     GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_UNIT_SECONDS, hijack, NULL);
 600
 601     GNUNET_SERVER_receive_done(client, GNUNET_OK);
 602 }
 603
 604 /**
 605  * This receives the dns-payload from the daemon-vpn and sends it on over the udp-socket
 606  */
 607 static void
 608 receive_query(void *cls __attribute__((unused)),
 609               struct GNUNET_SERVER_Client *client,
 610               const struct GNUNET_MessageHeader *message) {
 611     struct query_packet* pkt = (struct query_packet*)message;
 612     struct dns_pkt* dns = (struct dns_pkt*)pkt->data;
 613     struct dns_pkt_parsed* pdns = parse_dns_packet(dns);
 614
 615     query_states[dns->s.id].valid = GNUNET_YES;
 616     query_states[dns->s.id].client = client;
 617     query_states[dns->s.id].local_ip = pkt->orig_from;
 618     query_states[dns->s.id].local_port = pkt->src_port;
 619     query_states[dns->s.id].remote_ip = pkt->orig_to;
 620     query_states[dns->s.id].namelen = strlen((char*)dns->data) + 1;
 621     query_states[dns->s.id].name = GNUNET_malloc(query_states[dns->s.id].namelen);
 622     memcpy(query_states[dns->s.id].name, dns->data, query_states[dns->s.id].namelen);
 623
 624     /* The query is for a .gnunet-address */
 625     if (pdns->queries[0]->namelen > 9 &&
 626         0 == strncmp(pdns->queries[0]->name+(pdns->queries[0]->namelen - 9), ".gnunet.", 9))
 627       {
 628         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Query for .gnunet!\n");
 629         GNUNET_HashCode key;
 630         GNUNET_CRYPTO_hash(pdns->queries[0]->name, pdns->queries[0]->namelen, &key);
 631
 632         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 633                    "Getting with key %08x, len is %d\n",
 634                    *((unsigned int*)&key),
 635                    pdns->queries[0]->namelen);
 636
 637         struct receive_dht_cls* cls = GNUNET_malloc(sizeof(struct receive_dht_cls));
 638         cls->id = dns->s.id;
 639
 640         cls->handle = GNUNET_DHT_get_start(dht,
 641                                            GNUNET_TIME_UNIT_MINUTES,
 642                                            GNUNET_BLOCK_TYPE_DNS,
 643                                            &key,
 644                                            DEFAULT_GET_REPLICATION,
 645                                            GNUNET_DHT_RO_NONE,
 646                                            NULL,
 647                                            0,
 648                                            NULL,
 649                                            0,
 650                                            receive_dht,
 651                                            cls);
 652
 653         goto outfree;
 654       }
 655
 656     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Query for '%s'; namelen=%d\n", pdns->queries[0]->name, pdns->queries[0]->namelen);
 657
 658     /* This is a PTR-Query. Check if it is for "our" network */
 659     if (htons(pdns->queries[0]->qtype) == 12 &&
 660         74 == pdns->queries[0]->namelen)
 661       {
 662         char* ipv6addr;
 663         char ipv6[16];
 664         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.";
 665         unsigned int i;
 666         unsigned long long ipv6prefix;
 667         unsigned int comparelen;
 668
 669         GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_string(cfg, "vpn", "IPV6ADDR", &ipv6addr));
 670         inet_pton (AF_INET6, ipv6addr, ipv6);
 671         GNUNET_free(ipv6addr);
 672
 673         GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_number(cfg, "vpn", "IPV6PREFIX", &ipv6prefix));
 674         GNUNET_assert(ipv6prefix < 127);
 675         ipv6prefix = (ipv6prefix + 7)/8;
 676
 677         for (i = ipv6prefix; i < 16; i++)
 678           ipv6[i] = 0;
 679
 680         for (i = 0; i < 16; i++)
 681           {
 682             unsigned char c1 = ipv6[i] >> 4;
 683             unsigned char c2 = ipv6[i] & 0xf;
 684
 685             if (c1 <= 9)
 686               ipv6rev[62-(4*i)] = c1 + '0';
 687             else
 688               ipv6rev[62-(4*i)] = c1 + 87; /* 87 is the difference between 'a' and 10 */
 689
 690             if (c2 <= 9)
 691               ipv6rev[62-((4*i)+2)] = c2 + '0';
 692             else
 693               ipv6rev[62-((4*i)+2)] = c2 + 87;
 694           }
 695         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "My network is %s'.\n", ipv6rev);
 696         comparelen = 10 + 4*ipv6prefix;
 697         if(0 == strncmp(pdns->queries[0]->name+(pdns->queries[0]->namelen - comparelen),
 698                         ipv6rev + (74 - comparelen),
 699                         comparelen))
 700           {
 701             GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Reverse-Query for .gnunet!\n");
 702
 703             GNUNET_SCHEDULER_add_now(send_rev_query, pdns);
 704
 705             goto out;
 706           }
 707       }
 708
 709     char* virt_dns;
 710     unsigned int virt_dns_bytes;
 711     if (GNUNET_SYSERR ==
 712         GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "VIRTDNS",
 713                                                &virt_dns))
 714       {
 715         GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 716                     "No entry 'VIRTDNS' in configuration!\n");
 717         exit (1);
 718       }
 719
 720     if (1 != inet_pton (AF_INET, virt_dns, &virt_dns_bytes))
 721       {
 722         GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 723                     "Error parsing 'VIRTDNS': %s; %m!\n", virt_dns);
 724         exit(1);
 725       }
 726
 727     GNUNET_free(virt_dns);
 728
 729     if (virt_dns_bytes == pkt->orig_to)
 730       {
 731         /* This is a packet that was sent directly to the virtual dns-server
 732          *
 733          * This means we have to send this query over gnunet
 734          */
 735
 736         size_t size = sizeof(struct GNUNET_MESH_Tunnel*) + sizeof(struct GNUNET_MessageHeader) + (ntohs(message->size) - sizeof(struct query_packet) + 1);
 737         struct tunnel_cls *cls_ =  GNUNET_malloc(size);
 738         cls_->hdr.size = size - sizeof(struct GNUNET_MESH_Tunnel*);
 739
 740         cls_->hdr.type = ntohs(GNUNET_MESSAGE_TYPE_REMOTE_QUERY_DNS);
 741         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "size: %d\n", size);
 742
 743         memcpy(&cls_->dns, dns, cls_->hdr.size);
 744         GNUNET_SCHEDULER_add_now(send_mesh_query, cls_);
 745
 746         goto out;
 747       }
 748
 749
 750     /* The query should be sent to the network */
 751
 752     struct sockaddr_in dest;
 753     memset(&dest, 0, sizeof dest);
 754     dest.sin_port = htons(53);
 755     dest.sin_addr.s_addr = pkt->orig_to;
 756
 757     GNUNET_NETWORK_socket_sendto(dnsout,
 758                                  dns,
 759                                  ntohs(pkt->hdr.size) - sizeof(struct query_packet) + 1,
 760                                  (struct sockaddr*) &dest,
 761                                  sizeof dest);
 762
 763 outfree:
 764     free_parsed_dns_packet(pdns);
 765     pdns = NULL;
 766 out:
 767     GNUNET_SERVER_receive_done(client, GNUNET_OK);
 768 }
 769
 770 static void read_response (void *cls,
 771                            const struct GNUNET_SCHEDULER_TaskContext *tc);
 772
 773 static void
 774 open_port ()
 775 {
 776   struct sockaddr_in addr;
 777
 778   dnsout = GNUNET_NETWORK_socket_create (AF_INET, SOCK_DGRAM, 0);
 779   if (dnsout == NULL)
 780     return;
 781   memset (&addr, 0, sizeof (struct sockaddr_in));
 782
 783   int err = GNUNET_NETWORK_socket_bind (dnsout,
 784                                         (struct sockaddr *) &addr,
 785                                         sizeof (struct sockaddr_in));
 786
 787   if (err != GNUNET_YES)
 788     {
 789       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 790                   "Could not bind a port, exiting\n");
 791       return;
 792     }
 793
 794   /* Read the port we bound to */
 795   socklen_t addrlen = sizeof (struct sockaddr_in);
 796   err = getsockname (GNUNET_NETWORK_get_fd (dnsout),
 797                      (struct sockaddr *) &addr, &addrlen);
 798
 799   dnsoutport = htons (addr.sin_port);
 800
 801   GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL, dnsout,
 802                                  &read_response, NULL);
 803 }
 804
 805 /**
 806  * Read a response-packet of the UDP-Socket
 807  */
 808 static void
 809 read_response (void *cls __attribute__((unused)), const struct GNUNET_SCHEDULER_TaskContext *tc)
 810 {
 811   struct sockaddr_in addr;
 812   socklen_t addrlen = sizeof (addr);
 813   int r;
 814   int len;
 815
 816   if (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
 817     return;
 818
 819   memset (&addr, 0, sizeof addr);
 820
 821 #ifndef MINGW
 822   if (0 != ioctl (GNUNET_NETWORK_get_fd (dnsout), FIONREAD, &len))
 823     {
 824       unhijack (dnsoutport);
 825       open_port ();
 826       GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS, hijack, NULL);
 827       return;
 828     }
 829 #else
 830   /* port the code above? */
 831   len = 65536;
 832 #endif
 833   {
 834     unsigned char buf[len];
 835     struct dns_pkt *dns = (struct dns_pkt *) buf;
 836
 837     r = GNUNET_NETWORK_socket_recvfrom (dnsout,
 838                                         buf,
 839                                         sizeof (buf),
 840                                         (struct sockaddr *) &addr, &addrlen);
 841
 842     if (r < 0)
 843       {
 844         unhijack (dnsoutport);
 845         open_port ();
 846         GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS, hijack, NULL);
 847         return;
 848       }
 849
 850     if (query_states[dns->s.id].valid == GNUNET_YES)
 851       {
 852         if (query_states[dns->s.id].tunnel != NULL)
 853           {
 854             uint32_t *c = GNUNET_malloc(4 + r);
 855             *c = r;
 856             memcpy(c+1, dns, r);
 857             GNUNET_MESH_notify_transmit_ready (query_states[dns->s.id].tunnel,
 858                                                GNUNET_YES,
 859                                                32,
 860                                                GNUNET_TIME_UNIT_MINUTES,
 861                                                NULL, r + sizeof(struct GNUNET_MessageHeader), mesh_send_response, c);
 862           }
 863         else
 864           {
 865             query_states[dns->s.id].valid = GNUNET_NO;
 866
 867             size_t len = sizeof (struct answer_packet) + r - 1; /* 1 for the unsigned char data[1]; */
 868             struct answer_packet_list *answer =
 869               GNUNET_malloc (len + 2 * sizeof (struct answer_packet_list *));
 870             answer->pkt.hdr.type =
 871               htons (GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 872             answer->pkt.hdr.size = htons (len);
 873             answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_IP;
 874             answer->pkt.from = addr.sin_addr.s_addr;
 875             answer->pkt.to = query_states[dns->s.id].local_ip;
 876             answer->pkt.dst_port = query_states[dns->s.id].local_port;
 877             memcpy (answer->pkt.data, buf, r);
 878
 879             GNUNET_CONTAINER_DLL_insert_after (head, tail, tail, answer);
 880
 881             GNUNET_SERVER_notify_transmit_ready (query_states[dns->s.id].
 882                                                  client, len,
 883                                                  GNUNET_TIME_UNIT_FOREVER_REL,
 884                                                  &send_answer,
 885                                                  query_states[dns->s.id].
 886                                                  client);
 887           }
 888       }
 889   }
 890   GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
 891                                  dnsout, &read_response, NULL);
 892 }
 893
 894
 895 /**
 896  * Task run during shutdown.
 897  *
 898  * @param cls unused
 899  * @param tc unused
 900  */
 901 static void
 902 cleanup_task (void *cls __attribute__((unused)),
 903               const struct GNUNET_SCHEDULER_TaskContext *tc)
 904 {
 905   GNUNET_assert(0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN));
 906
 907   unhijack(dnsoutport);
 908   GNUNET_DHT_disconnect(dht);
 909 }
 910
 911 /**
 912  * @brief Create a port-map from udp and tcp redirects
 913  *
 914  * @param udp_redirects
 915  * @param tcp_redirects
 916  *
 917  * @return
 918  */
 919 uint64_t
 920 get_port_from_redirects (const char *udp_redirects, const char *tcp_redirects)
 921 {
 922   uint64_t ret = 0;
 923   char* cpy, *hostname, *redirect;
 924   int local_port, count = 0;
 925
 926   if (NULL != udp_redirects)
 927     {
 928       cpy = GNUNET_strdup (udp_redirects);
 929       for (redirect = strtok (cpy, " "); redirect != NULL; redirect = strtok (NULL, " "))
 930         {
 931           if (NULL == (hostname = strstr (redirect, ":")))
 932             {
 933               GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: option %s is not formatted correctly!\n", redirect);
 934               continue;
 935             }
 936           hostname[0] = '\0';
 937           local_port = atoi (redirect);
 938           if (!((local_port > 0) && (local_port < 65536)))
 939             GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: %s is not a correct port.", redirect);
 940
 941           ret |= (0xFFFF & htons(local_port));
 942           ret <<= 16;
 943           count ++;
 944
 945           if(count > 4)
 946             {
 947               ret = 0;
 948               goto out;
 949             }
 950         }
 951       GNUNET_free(cpy);
 952       cpy = NULL;
 953     }
 954
 955   if (NULL != tcp_redirects)
 956     {
 957       cpy = GNUNET_strdup (tcp_redirects);
 958       for (redirect = strtok (cpy, " "); redirect != NULL; redirect = strtok (NULL, " "))
 959         {
 960           if (NULL == (hostname = strstr (redirect, ":")))
 961             {
 962               GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: option %s is not formatted correctly!\n", redirect);
 963               continue;
 964             }
 965           hostname[0] = '\0';
 966           local_port = atoi (redirect);
 967           if (!((local_port > 0) && (local_port < 65536)))
 968             GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: %s is not a correct port.", redirect);
 969
 970           ret |= (0xFFFF & htons(local_port));
 971           ret <<= 16;
 972           count ++;
 973
 974           if(count > 4)
 975             {
 976               ret = 0;
 977               goto out;
 978             }
 979         }
 980       GNUNET_free(cpy);
 981       cpy = NULL;
 982     }
 983
 984 out:
 985   if (NULL != cpy)
 986     GNUNET_free(cpy);
 987   return ret;
 988 }
 989
 990 void
 991 publish_name (const char *name, uint64_t ports, uint32_t service_type,
 992               struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key)
 993 {
 994   size_t size = sizeof (struct GNUNET_DNS_Record);
 995   struct GNUNET_DNS_Record data;
 996   memset (&data, 0, size);
 997
 998   data.purpose.size =
 999     htonl (size - sizeof (struct GNUNET_CRYPTO_RsaSignature));
1000   data.purpose.purpose = GNUNET_SIGNATURE_PURPOSE_DNS_RECORD;
1001
1002   GNUNET_CRYPTO_hash (name, strlen (name) + 1, &data.service_descriptor);
1003   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Store with key1 %x\n",
1004               *((unsigned long long *) &data.service_descriptor));
1005
1006   data.service_type = service_type;
1007   data.ports = ports;
1008
1009   GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &data.peer);
1010
1011   data.expiration_time =
1012     GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_HOURS, 2));
1013
1014   /* Sign the block */
1015   if (GNUNET_OK != GNUNET_CRYPTO_rsa_sign (my_private_key,
1016                                            &data.purpose, &data.signature))
1017     {
1018       GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "could not sign DNS_Record\n");
1019       return;
1020     }
1021
1022   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1023               "Putting with key %08x, size = %d\n",
1024               *((unsigned int *) &data.service_descriptor), size);
1025
1026   GNUNET_DHT_put (dht,
1027                   &data.service_descriptor,
1028                   DEFAULT_PUT_REPLICATION,
1029                   GNUNET_DHT_RO_NONE,
1030                   GNUNET_BLOCK_TYPE_DNS,
1031                   size,
1032                   (char *) &data,
1033                   GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_HOURS),
1034                   GNUNET_TIME_UNIT_MINUTES, NULL, NULL);
1035 }
1036
1037 /**
1038  * @brief Publishes the record defined by the section section
1039  *
1040  * @param cls closure
1041  * @param section the current section
1042  */
1043 void
1044 publish_iterate (void *cls __attribute__((unused)), const char *section)
1045 {
1046   char *udp_redirects, *tcp_redirects, *alternative_names, *alternative_name,
1047     *keyfile;
1048
1049   GNUNET_CONFIGURATION_get_value_string (servicecfg, section,
1050                                          "UDP_REDIRECTS", &udp_redirects);
1051   GNUNET_CONFIGURATION_get_value_string (servicecfg, section, "TCP_REDIRECTS",
1052                                          &tcp_redirects);
1053
1054   if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (cfg, "GNUNETD",
1055                                                             "HOSTKEY",
1056                                                             &keyfile))
1057     {
1058       GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "could not read keyfile-value\n");
1059       if (keyfile != NULL)
1060         GNUNET_free (keyfile);
1061       return;
1062     }
1063
1064   struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key =
1065     GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
1066   GNUNET_free (keyfile);
1067   GNUNET_assert (my_private_key != NULL);
1068
1069   uint64_t ports = get_port_from_redirects (udp_redirects, tcp_redirects);
1070   uint32_t service_type = 0;
1071
1072   if (NULL != udp_redirects)
1073     service_type = GNUNET_DNS_SERVICE_TYPE_UDP;
1074
1075   if (NULL != tcp_redirects)
1076     service_type |= GNUNET_DNS_SERVICE_TYPE_TCP;
1077
1078   service_type = htonl (service_type);
1079
1080
1081   publish_name (section, ports, service_type, my_private_key);
1082
1083   GNUNET_CONFIGURATION_get_value_string (servicecfg, section,
1084                                          "ALTERNATIVE_NAMES",
1085                                          &alternative_names);
1086   for (alternative_name = strtok (alternative_names, " ");
1087        alternative_name != NULL; alternative_name = strtok (NULL, " "))
1088     {
1089       char *altname =
1090         alloca (strlen (alternative_name) + strlen (section) + 1 + 1);
1091       strcpy (altname, alternative_name);
1092       strcpy (altname + strlen (alternative_name) + 1, section);
1093       altname[strlen (alternative_name)] = '.';
1094
1095       publish_name (altname, ports, service_type, my_private_key);
1096     }
1097
1098   GNUNET_free_non_null(alternative_names);
1099   GNUNET_CRYPTO_rsa_key_free (my_private_key);
1100   GNUNET_free_non_null (udp_redirects);
1101   GNUNET_free_non_null (tcp_redirects);
1102 }
1103
1104 /**
1105  * Publish a DNS-record in the DHT. This is up to now just for testing.
1106  */
1107 static void
1108 publish_names (void *cls __attribute__((unused)),
1109                const struct GNUNET_SCHEDULER_TaskContext *tc) {
1110     char *services;
1111     if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1112       return;
1113
1114     if (NULL != servicecfg)
1115       GNUNET_CONFIGURATION_destroy(servicecfg);
1116
1117     GNUNET_CONFIGURATION_get_value_filename(cfg, "dns", "SERVICES", &services);
1118
1119     servicecfg = GNUNET_CONFIGURATION_create();
1120     if (GNUNET_OK == GNUNET_CONFIGURATION_parse(servicecfg, services))
1121       {
1122         GNUNET_log(GNUNET_ERROR_TYPE_INFO, "Parsing services %s\n", services);
1123         GNUNET_CONFIGURATION_iterate_sections(servicecfg, publish_iterate, NULL);
1124       }
1125     if (NULL != services)
1126       GNUNET_free(services);
1127
1128     GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_HOURS,
1129                                   publish_names,
1130                                   NULL);
1131 }
1132
1133 /**
1134  * @param cls closure
1135  * @param server the initialized server
1136  * @param cfg_ configuration to use
1137  */
1138 static void
1139 run (void *cls,
1140      struct GNUNET_SERVER_Handle *server,
1141      const struct GNUNET_CONFIGURATION_Handle *cfg_)
1142 {
1143   static const struct GNUNET_SERVER_MessageHandler handlers[] = {
1144     /* callback, cls, type, size */
1145     {&receive_query, NULL, GNUNET_MESSAGE_TYPE_LOCAL_QUERY_DNS, 0},
1146     {&rehijack, NULL, GNUNET_MESSAGE_TYPE_REHIJACK,
1147      sizeof (struct GNUNET_MessageHeader)},
1148     {NULL, NULL, 0, 0}
1149   };
1150
1151   static struct GNUNET_MESH_MessageHandler *mesh_handlers;
1152
1153   if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno(cfg_, "dns", "PROVIDE_EXIT"))
1154     mesh_handlers = (struct GNUNET_MESH_MessageHandler[]) {
1155           {receive_mesh_query, GNUNET_MESSAGE_TYPE_REMOTE_QUERY_DNS, 0},
1156           {NULL, 0, 0}
1157     };
1158   else
1159     mesh_handlers = (struct GNUNET_MESH_MessageHandler[]) {
1160           {receive_mesh_answer, GNUNET_MESSAGE_TYPE_REMOTE_ANSWER_DNS, 0},
1161           {NULL, 0, 0}
1162     };
1163
1164   static const GNUNET_MESH_ApplicationType apptypes[] =
1165     { GNUNET_APPLICATION_TYPE_INTERNET_RESOLVER,
1166     GNUNET_APPLICATION_TYPE_END
1167   };
1168
1169   mesh_handle = GNUNET_MESH_connect (cfg_, NULL, NULL, mesh_handlers, apptypes);
1170
1171   cfg = cfg_;
1172
1173   unsigned int i;
1174   for (i = 0; i < 65536; i++)
1175     {
1176       query_states[i].valid = GNUNET_NO;
1177     }
1178
1179   dht = GNUNET_DHT_connect (cfg, 1024);
1180
1181   open_port ();
1182
1183   GNUNET_SCHEDULER_add_now (publish_names, NULL);
1184
1185   GNUNET_SERVER_add_handlers (server, handlers);
1186   GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
1187                                 &cleanup_task, cls);
1188 }
1189
1190 /**
1191  * The main function for the dns service.
1192  *
1193  * @param argc number of arguments from the command line
1194  * @param argv command line arguments
1195  * @return 0 ok, 1 on error
1196  */
1197 int
1198 main (int argc, char *const *argv)
1199 {
1200   return (GNUNET_OK ==
1201           GNUNET_SERVICE_run (argc,
1202                               argv,
1203                               "dns",
1204                               GNUNET_SERVICE_OPTION_NONE,
1205                               &run, NULL)) ? 0 : 1;
1206 }