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 tunnel to send queries
  47  */
  48 static struct GNUNET_MESH_Tunnel* dns_tunnel;
  49
  50 /**
  51  * The UDP-Socket through which DNS-Resolves will be sent if they are not to be
  52  * sent through gnunet. The port of this socket will not be hijacked.
  53  */
  54 static struct GNUNET_NETWORK_Handle *dnsout;
  55
  56 /**
  57  * The port bound to the socket dnsout
  58  */
  59 static unsigned short dnsoutport;
  60
  61 /**
  62  * A handle to the DHT-Service
  63  */
  64 static struct GNUNET_DHT_Handle *dht;
  65
  66 /**
  67  * The configuration to use
  68  */
  69 static const struct GNUNET_CONFIGURATION_Handle *cfg;
  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   if (NULL == peer) return;
 247   struct tunnel_cls *cls_ = (struct tunnel_cls*)cls;
 248   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Connected to peer %s, sending query with id %d\n", GNUNET_i2s(peer), ntohs(cls_->dns.s.id));
 249
 250   GNUNET_MESH_notify_transmit_ready(cls_->tunnel,
 251                                     GNUNET_YES,
 252                                     42,
 253                                     GNUNET_TIME_UNIT_MINUTES,
 254                                     NULL,
 255                                     cls_->hdr.size,
 256                                     mesh_send,
 257                                     cls);
 258 }
 259
 260
 261 static void
 262 send_mesh_query (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
 263 {
 264   if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
 265     return;
 266
 267   struct tunnel_cls *cls_ = (struct tunnel_cls*)cls;
 268
 269   if (NULL == dns_tunnel)
 270     dns_tunnel = GNUNET_MESH_peer_request_connect_by_type(mesh_handle,
 271                                                           GNUNET_TIME_UNIT_HOURS,
 272                                                           GNUNET_APPLICATION_TYPE_INTERNET_RESOLVER,
 273                                                           mesh_connect,
 274                                                           NULL,
 275                                                           cls_);
 276   cls_->tunnel = dns_tunnel;
 277   remote_pending[cls_->dns.s.id] = cls_;
 278 }
 279
 280 static int
 281 receive_mesh_query (void *cls __attribute__((unused)),
 282                     struct GNUNET_MESH_Tunnel *tunnel,
 283                     void **ctx __attribute__((unused)),
 284                     const struct GNUNET_PeerIdentity *sender __attribute__((unused)),
 285                     const struct GNUNET_MessageHeader *message,
 286                     const struct GNUNET_TRANSPORT_ATS_Information *atsi __attribute__((unused)))
 287 {
 288   struct dns_pkt *dns = (struct dns_pkt*)(message + 1);
 289
 290   struct sockaddr_in dest;
 291   memset(&dest, 0, sizeof dest);
 292   dest.sin_port = htons(53);
 293   /* TODO: read from config */
 294   inet_pton(AF_INET, "8.8.8.8", &dest.sin_addr);
 295
 296   query_states[dns->s.id].tunnel = tunnel;
 297   query_states[dns->s.id].valid = GNUNET_YES;
 298
 299   GNUNET_NETWORK_socket_sendto(dnsout,
 300                                dns,
 301                                ntohs(message->size) - sizeof(struct GNUNET_MessageHeader),
 302                                (struct sockaddr*) &dest,
 303                                sizeof dest);
 304
 305   return GNUNET_SYSERR;
 306 }
 307
 308 static int
 309 receive_mesh_answer (void *cls __attribute__((unused)),
 310                      struct GNUNET_MESH_Tunnel *tunnel,
 311                      void **ctx __attribute__((unused)),
 312                      const struct GNUNET_PeerIdentity *sender,
 313                      const struct GNUNET_MessageHeader *message,
 314                      const struct GNUNET_TRANSPORT_ATS_Information *atsi __attribute__((unused)))
 315 {
 316   /* TODo: size check */
 317   struct dns_pkt *dns = (struct dns_pkt *) (message + 1);
 318
 319   /* They sent us a packet we were not waiting for */
 320   if (remote_pending[dns->s.id] == NULL
 321       || remote_pending[dns->s.id]->tunnel != tunnel)
 322     return GNUNET_SYSERR;
 323   if (query_states[dns->s.id].valid != GNUNET_YES)
 324     return GNUNET_SYSERR;
 325   query_states[dns->s.id].valid = GNUNET_NO;
 326
 327   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Received answer from peer %s, dns-id %d\n", GNUNET_i2s(sender), ntohs(dns->s.id));
 328
 329   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 */
 330     + sizeof (struct dns_record_line) - 1 + 16; /* To hold the IPv6-Address */
 331
 332   struct answer_packet_list *answer =
 333     GNUNET_malloc (len + 2 * sizeof (struct answer_packet_list *));
 334   memset (answer, 0, len + 2 * sizeof (struct answer_packet_list *));
 335
 336   answer->pkt.hdr.type = htons (GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 337   answer->pkt.hdr.size = htons (len);
 338   answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_REMOTE;
 339
 340   struct dns_pkt_parsed* pdns = parse_dns_packet(dns);
 341
 342   if (ntohs(pdns->s.ancount) < 1)
 343     {
 344       GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Answer only contains %d answers.\n", ntohs(pdns->s.ancount));
 345       free_parsed_dns_packet(pdns);
 346       return GNUNET_OK;
 347     }
 348
 349   answer->pkt.addrsize = ntohs(pdns->answers[0]->data_len);
 350   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "The first answer has the addrlen %d\n", answer->pkt.addrsize);
 351   memcpy(answer->pkt.addr, pdns->answers[0]->data, ntohs(pdns->answers[0]->data_len));
 352
 353   answer->pkt.from = query_states[dns->s.id].remote_ip;
 354
 355   answer->pkt.to = query_states[dns->s.id].local_ip;
 356   answer->pkt.dst_port = query_states[dns->s.id].local_port;
 357
 358   struct dns_pkt *dpkt = (struct dns_pkt *) answer->pkt.data;
 359
 360   dpkt->s.id = dns->s.id;
 361   dpkt->s.aa = 1;
 362   dpkt->s.qr = 1;
 363   dpkt->s.ra = 1;
 364   dpkt->s.qdcount = htons (1);
 365   dpkt->s.ancount = htons (1);
 366
 367   memcpy (dpkt->data, query_states[dns->s.id].name,
 368           query_states[dns->s.id].namelen);
 369   GNUNET_free (query_states[dns->s.id].name);
 370
 371   struct dns_query_line *dque =
 372     (struct dns_query_line *) (dpkt->data +
 373                                (query_states[dns->s.id].namelen));
 374   dque->type = htons (28);      /* AAAA */
 375   dque->class = htons (1);      /* IN */
 376
 377   char *anname =
 378     (char *) (dpkt->data + (query_states[dns->s.id].namelen) +
 379               sizeof (struct dns_query_line));
 380   memcpy (anname, "\xc0\x0c", 2);
 381
 382   struct dns_record_line *drec_data =
 383     (struct dns_record_line *) (dpkt->data +
 384                                 (query_states[dns->s.id].namelen) +
 385                                 sizeof (struct dns_query_line) + 2);
 386   drec_data->type = htons (28); /* AAAA */
 387   drec_data->class = htons (1); /* IN */
 388
 389   drec_data->ttl = pdns->answers[0]->ttl;
 390   drec_data->data_len = htons (16);
 391
 392   /* Calculate at which offset in the packet the IPv6-Address belongs, it is
 393    * filled in by the daemon-vpn */
 394   answer->pkt.addroffset =
 395     htons ((unsigned short) ((unsigned long) (&drec_data->data) -
 396                              (unsigned long) (&answer->pkt)));
 397
 398   GNUNET_CONTAINER_DLL_insert_after (head, tail, tail, answer);
 399
 400   GNUNET_SERVER_notify_transmit_ready (query_states[dns->s.id].client,
 401                                        len,
 402                                        GNUNET_TIME_UNIT_FOREVER_REL,
 403                                        &send_answer,
 404                                        query_states[dns->s.id].client);
 405
 406   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Sent answer of length %d on to client, addroffset = %d\n", len, answer->pkt.addroffset);
 407
 408   free_parsed_dns_packet(pdns);
 409   return GNUNET_OK;
 410 }
 411
 412
 413 static void
 414 send_rev_query(void * cls, const struct GNUNET_SCHEDULER_TaskContext *tc) {
 415     if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
 416       return;
 417
 418     struct dns_pkt_parsed* pdns = (struct dns_pkt_parsed*) cls;
 419
 420     unsigned short id = pdns->s.id;
 421
 422     free_parsed_dns_packet(pdns);
 423
 424     if (query_states[id].valid != GNUNET_YES) return;
 425     query_states[id].valid = GNUNET_NO;
 426
 427     GNUNET_assert(query_states[id].namelen == 74);
 428
 429     size_t len = sizeof(struct answer_packet) - 1 \
 430                  + sizeof(struct dns_static) \
 431                  + 74 /* this is the length of a reverse ipv6-lookup */ \
 432                  + sizeof(struct dns_query_line) \
 433                  + 2 /* To hold the pointer (as defined in RFC1035) to the name */ \
 434                  + sizeof(struct dns_record_line) - 1 \
 435                  - 2 /* We do not know the lenght of the answer yet*/;
 436
 437     struct answer_packet_list* answer = GNUNET_malloc(len + 2*sizeof(struct answer_packet_list*));
 438     memset(answer, 0, len + 2*sizeof(struct answer_packet_list*));
 439
 440     answer->pkt.hdr.type = htons(GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 441     answer->pkt.hdr.size = htons(len);
 442     answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_REV;
 443
 444     answer->pkt.from = query_states[id].remote_ip;
 445
 446     answer->pkt.to = query_states[id].local_ip;
 447     answer->pkt.dst_port = query_states[id].local_port;
 448
 449     struct dns_pkt *dpkt = (struct dns_pkt*)answer->pkt.data;
 450
 451     dpkt->s.id = id;
 452     dpkt->s.aa = 1;
 453     dpkt->s.qr = 1;
 454     dpkt->s.ra = 1;
 455     dpkt->s.qdcount = htons(1);
 456     dpkt->s.ancount = htons(1);
 457
 458     memcpy(dpkt->data, query_states[id].name, query_states[id].namelen);
 459     GNUNET_free(query_states[id].name);
 460
 461     struct dns_query_line* dque = (struct dns_query_line*)(dpkt->data+(query_states[id].namelen));
 462     dque->type = htons(12); /* PTR */
 463     dque->class = htons(1); /* IN */
 464
 465     char* anname = (char*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line));
 466     memcpy(anname, "\xc0\x0c", 2);
 467
 468     struct dns_record_line *drec_data = (struct dns_record_line*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line)+2);
 469     drec_data->type = htons(12); /* AAAA */
 470     drec_data->class = htons(1); /* IN */
 471     /* FIXME: read the TTL from block:
 472      * GNUNET_TIME_absolute_get_remaining(rec->expiration_time)
 473      *
 474      * But how to get the seconds out of this?
 475      */
 476     drec_data->ttl = htonl(3600);
 477
 478     /* Calculate at which offset in the packet the length of the name and the
 479      * name, it is filled in by the daemon-vpn */
 480     answer->pkt.addroffset = htons((unsigned short)((unsigned long)(&drec_data->data_len)-(unsigned long)(&answer->pkt)));
 481
 482     GNUNET_CONTAINER_DLL_insert_after(head, tail, tail, answer);
 483
 484     GNUNET_SERVER_notify_transmit_ready(query_states[id].client,
 485                                         len,
 486                                         GNUNET_TIME_UNIT_FOREVER_REL,
 487                                         &send_answer,
 488                                         query_states[id].client);
 489 }
 490
 491 /**
 492  * Receive a block from the dht.
 493  */
 494 static void
 495 receive_dht(void *cls,
 496             struct GNUNET_TIME_Absolute exp __attribute__((unused)),
 497             const GNUNET_HashCode *key __attribute__((unused)),
 498             const struct GNUNET_PeerIdentity *const *get_path __attribute__((unused)),
 499             const struct GNUNET_PeerIdentity *const *put_path __attribute__((unused)),
 500             enum GNUNET_BLOCK_Type type,
 501             size_t size,
 502             const void *data) {
 503
 504     unsigned short id = ((struct receive_dht_cls*)cls)->id;
 505     struct GNUNET_DHT_GetHandle* handle = ((struct receive_dht_cls*)cls)->handle;
 506     GNUNET_free(cls);
 507
 508     GNUNET_assert(type == GNUNET_BLOCK_TYPE_DNS);
 509
 510     /* If no query with this id is pending, ignore the block */
 511     if (query_states[id].valid != GNUNET_YES) return;
 512     query_states[id].valid = GNUNET_NO;
 513
 514     const struct GNUNET_DNS_Record* rec = data;
 515     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 516                "Got block of size %d, peer: %08x, desc: %08x\n",
 517                size,
 518                *((unsigned int*)&rec->peer),
 519                *((unsigned int*)&rec->service_descriptor));
 520
 521     size_t len = sizeof(struct answer_packet) - 1 \
 522                  + sizeof(struct dns_static) \
 523                  + query_states[id].namelen \
 524                  + sizeof(struct dns_query_line) \
 525                  + 2 /* To hold the pointer (as defined in RFC1035) to the name */ \
 526                  + sizeof(struct dns_record_line) - 1 \
 527                  + 16; /* To hold the IPv6-Address */
 528
 529     struct answer_packet_list* answer = GNUNET_malloc(len + 2*sizeof(struct answer_packet_list*));
 530     memset(answer, 0, len + 2*sizeof(struct answer_packet_list*));
 531
 532     answer->pkt.hdr.type = htons(GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 533     answer->pkt.hdr.size = htons(len);
 534     answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_SERVICE;
 535
 536     GNUNET_CRYPTO_hash(&rec->peer,
 537                        sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
 538                        &answer->pkt.service_descr.peer);
 539
 540     memcpy(&answer->pkt.service_descr.service_descriptor,
 541            &rec->service_descriptor,
 542            sizeof(GNUNET_HashCode));
 543     memcpy(&answer->pkt.service_descr.service_type,
 544            &rec->service_type,
 545            sizeof(answer->pkt.service_descr.service_type));
 546     memcpy(&answer->pkt.service_descr.ports, &rec->ports, sizeof(answer->pkt.service_descr.ports));
 547
 548     answer->pkt.from = query_states[id].remote_ip;
 549
 550     answer->pkt.to = query_states[id].local_ip;
 551     answer->pkt.dst_port = query_states[id].local_port;
 552
 553     struct dns_pkt *dpkt = (struct dns_pkt*)answer->pkt.data;
 554
 555     dpkt->s.id = id;
 556     dpkt->s.aa = 1;
 557     dpkt->s.qr = 1;
 558     dpkt->s.ra = 1;
 559     dpkt->s.qdcount = htons(1);
 560     dpkt->s.ancount = htons(1);
 561
 562     memcpy(dpkt->data, query_states[id].name, query_states[id].namelen);
 563     GNUNET_free(query_states[id].name);
 564
 565     struct dns_query_line* dque = (struct dns_query_line*)(dpkt->data+(query_states[id].namelen));
 566     dque->type = htons(28); /* AAAA */
 567     dque->class = htons(1); /* IN */
 568
 569     char* anname = (char*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line));
 570     memcpy(anname, "\xc0\x0c", 2);
 571
 572     struct dns_record_line *drec_data = (struct dns_record_line*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line)+2);
 573     drec_data->type = htons(28); /* AAAA */
 574     drec_data->class = htons(1); /* IN */
 575
 576     /* FIXME: read the TTL from block:
 577      * GNUNET_TIME_absolute_get_remaining(rec->expiration_time)
 578      *
 579      * But how to get the seconds out of this?
 580      */
 581     drec_data->ttl = htonl(3600);
 582     drec_data->data_len = htons(16);
 583
 584     /* Calculate at which offset in the packet the IPv6-Address belongs, it is
 585      * filled in by the daemon-vpn */
 586     answer->pkt.addroffset = htons((unsigned short)((unsigned long)(&drec_data->data)-(unsigned long)(&answer->pkt)));
 587
 588     GNUNET_CONTAINER_DLL_insert_after(head, tail, tail, answer);
 589
 590     GNUNET_SERVER_notify_transmit_ready(query_states[id].client,
 591                                         len,
 592                                         GNUNET_TIME_UNIT_FOREVER_REL,
 593                                         &send_answer,
 594                                         query_states[id].client);
 595
 596     GNUNET_DHT_get_stop(handle);
 597 }
 598
 599 /**
 600  * This receives a GNUNET_MESSAGE_TYPE_REHIJACK and rehijacks the DNS
 601  */
 602 static void
 603 rehijack(void *cls __attribute__((unused)),
 604          struct GNUNET_SERVER_Client *client,
 605          const struct GNUNET_MessageHeader *message __attribute__((unused))) {
 606     unhijack(dnsoutport);
 607     GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_UNIT_SECONDS, hijack, NULL);
 608
 609     GNUNET_SERVER_receive_done(client, GNUNET_OK);
 610 }
 611
 612 /**
 613  * This receives the dns-payload from the daemon-vpn and sends it on over the udp-socket
 614  */
 615 static void
 616 receive_query(void *cls __attribute__((unused)),
 617               struct GNUNET_SERVER_Client *client,
 618               const struct GNUNET_MessageHeader *message) {
 619     struct query_packet* pkt = (struct query_packet*)message;
 620     struct dns_pkt* dns = (struct dns_pkt*)pkt->data;
 621     struct dns_pkt_parsed* pdns = parse_dns_packet(dns);
 622
 623     query_states[dns->s.id].valid = GNUNET_YES;
 624     query_states[dns->s.id].client = client;
 625     query_states[dns->s.id].local_ip = pkt->orig_from;
 626     query_states[dns->s.id].local_port = pkt->src_port;
 627     query_states[dns->s.id].remote_ip = pkt->orig_to;
 628     query_states[dns->s.id].namelen = strlen((char*)dns->data) + 1;
 629     query_states[dns->s.id].name = GNUNET_malloc(query_states[dns->s.id].namelen);
 630     memcpy(query_states[dns->s.id].name, dns->data, query_states[dns->s.id].namelen);
 631
 632     /* The query is for a .gnunet-address */
 633     if (pdns->queries[0]->namelen > 9 &&
 634         0 == strncmp(pdns->queries[0]->name+(pdns->queries[0]->namelen - 9), ".gnunet.", 9))
 635       {
 636         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Query for .gnunet!\n");
 637         GNUNET_HashCode key;
 638         GNUNET_CRYPTO_hash(pdns->queries[0]->name, pdns->queries[0]->namelen, &key);
 639
 640         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 641                    "Getting with key %08x, len is %d\n",
 642                    *((unsigned int*)&key),
 643                    pdns->queries[0]->namelen);
 644
 645         struct receive_dht_cls* cls = GNUNET_malloc(sizeof(struct receive_dht_cls));
 646         cls->id = dns->s.id;
 647
 648         cls->handle = GNUNET_DHT_get_start(dht,
 649                                            GNUNET_TIME_UNIT_MINUTES,
 650                                            GNUNET_BLOCK_TYPE_DNS,
 651                                            &key,
 652                                            DEFAULT_GET_REPLICATION,
 653                                            GNUNET_DHT_RO_NONE,
 654                                            NULL,
 655                                            0,
 656                                            NULL,
 657                                            0,
 658                                            receive_dht,
 659                                            cls);
 660
 661         goto outfree;
 662       }
 663
 664     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Query for '%s'; namelen=%d\n", pdns->queries[0]->name, pdns->queries[0]->namelen);
 665
 666     /* This is a PTR-Query. Check if it is for "our" network */
 667     if (htons(pdns->queries[0]->qtype) == 12 &&
 668         74 == pdns->queries[0]->namelen)
 669       {
 670         char* ipv6addr;
 671         char ipv6[16];
 672         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.";
 673         unsigned int i;
 674         unsigned long long ipv6prefix;
 675         unsigned int comparelen;
 676
 677         GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_string(cfg, "vpn", "IPV6ADDR", &ipv6addr));
 678         inet_pton (AF_INET6, ipv6addr, ipv6);
 679         GNUNET_free(ipv6addr);
 680
 681         GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_number(cfg, "vpn", "IPV6PREFIX", &ipv6prefix));
 682         GNUNET_assert(ipv6prefix < 127);
 683         ipv6prefix = (ipv6prefix + 7)/8;
 684
 685         for (i = ipv6prefix; i < 16; i++)
 686           ipv6[i] = 0;
 687
 688         for (i = 0; i < 16; i++)
 689           {
 690             unsigned char c1 = ipv6[i] >> 4;
 691             unsigned char c2 = ipv6[i] & 0xf;
 692
 693             if (c1 <= 9)
 694               ipv6rev[62-(4*i)] = c1 + '0';
 695             else
 696               ipv6rev[62-(4*i)] = c1 + 87; /* 87 is the difference between 'a' and 10 */
 697
 698             if (c2 <= 9)
 699               ipv6rev[62-((4*i)+2)] = c2 + '0';
 700             else
 701               ipv6rev[62-((4*i)+2)] = c2 + 87;
 702           }
 703         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "My network is %s'.\n", ipv6rev);
 704         comparelen = 10 + 4*ipv6prefix;
 705         if(0 == strncmp(pdns->queries[0]->name+(pdns->queries[0]->namelen - comparelen),
 706                         ipv6rev + (74 - comparelen),
 707                         comparelen))
 708           {
 709             GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Reverse-Query for .gnunet!\n");
 710
 711             GNUNET_SCHEDULER_add_now(send_rev_query, pdns);
 712
 713             goto out;
 714           }
 715       }
 716
 717     char* virt_dns;
 718     unsigned int virt_dns_bytes;
 719     if (GNUNET_SYSERR ==
 720         GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "VIRTDNS",
 721                                                &virt_dns))
 722       {
 723         GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 724                     "No entry 'VIRTDNS' in configuration!\n");
 725         exit (1);
 726       }
 727
 728     if (1 != inet_pton (AF_INET, virt_dns, &virt_dns_bytes))
 729       {
 730         GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 731                     "Error parsing 'VIRTDNS': %s; %m!\n", virt_dns);
 732         exit(1);
 733       }
 734
 735     GNUNET_free(virt_dns);
 736
 737     if (virt_dns_bytes == pkt->orig_to)
 738       {
 739         /* This is a packet that was sent directly to the virtual dns-server
 740          *
 741          * This means we have to send this query over gnunet
 742          */
 743
 744         size_t size = sizeof(struct GNUNET_MESH_Tunnel*) + sizeof(struct GNUNET_MessageHeader) + (ntohs(message->size) - sizeof(struct query_packet) + 1);
 745         struct tunnel_cls *cls_ =  GNUNET_malloc(size);
 746         cls_->hdr.size = size - sizeof(struct GNUNET_MESH_Tunnel*);
 747
 748         cls_->hdr.type = ntohs(GNUNET_MESSAGE_TYPE_REMOTE_QUERY_DNS);
 749         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "size: %d\n", size);
 750
 751         memcpy(&cls_->dns, dns, cls_->hdr.size - sizeof(struct GNUNET_MessageHeader));
 752         GNUNET_SCHEDULER_add_now(send_mesh_query, cls_);
 753
 754         goto out;
 755       }
 756
 757
 758     /* The query should be sent to the network */
 759
 760     struct sockaddr_in dest;
 761     memset(&dest, 0, sizeof dest);
 762     dest.sin_port = htons(53);
 763     dest.sin_addr.s_addr = pkt->orig_to;
 764
 765     GNUNET_NETWORK_socket_sendto(dnsout,
 766                                  dns,
 767                                  ntohs(pkt->hdr.size) - sizeof(struct query_packet) + 1,
 768                                  (struct sockaddr*) &dest,
 769                                  sizeof dest);
 770
 771 outfree:
 772     free_parsed_dns_packet(pdns);
 773     pdns = NULL;
 774 out:
 775     GNUNET_SERVER_receive_done(client, GNUNET_OK);
 776 }
 777
 778 static void read_response (void *cls,
 779                            const struct GNUNET_SCHEDULER_TaskContext *tc);
 780
 781 static void
 782 open_port ()
 783 {
 784   struct sockaddr_in addr;
 785
 786   dnsout = GNUNET_NETWORK_socket_create (AF_INET, SOCK_DGRAM, 0);
 787   if (dnsout == NULL)
 788     return;
 789   memset (&addr, 0, sizeof (struct sockaddr_in));
 790
 791   int err = GNUNET_NETWORK_socket_bind (dnsout,
 792                                         (struct sockaddr *) &addr,
 793                                         sizeof (struct sockaddr_in));
 794
 795   if (err != GNUNET_YES)
 796     {
 797       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 798                   "Could not bind a port, exiting\n");
 799       return;
 800     }
 801
 802   /* Read the port we bound to */
 803   socklen_t addrlen = sizeof (struct sockaddr_in);
 804   err = getsockname (GNUNET_NETWORK_get_fd (dnsout),
 805                      (struct sockaddr *) &addr, &addrlen);
 806
 807   dnsoutport = htons (addr.sin_port);
 808
 809   GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL, dnsout,
 810                                  &read_response, NULL);
 811 }
 812
 813 /**
 814  * Read a response-packet of the UDP-Socket
 815  */
 816 static void
 817 read_response (void *cls __attribute__((unused)), const struct GNUNET_SCHEDULER_TaskContext *tc)
 818 {
 819   struct sockaddr_in addr;
 820   socklen_t addrlen = sizeof (addr);
 821   int r;
 822   int len;
 823
 824   if (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
 825     return;
 826
 827   memset (&addr, 0, sizeof addr);
 828
 829 #ifndef MINGW
 830   if (0 != ioctl (GNUNET_NETWORK_get_fd (dnsout), FIONREAD, &len))
 831     {
 832       unhijack (dnsoutport);
 833       open_port ();
 834       GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS, hijack, NULL);
 835       return;
 836     }
 837 #else
 838   /* port the code above? */
 839   len = 65536;
 840 #endif
 841   {
 842     unsigned char buf[len];
 843     struct dns_pkt *dns = (struct dns_pkt *) buf;
 844
 845     r = GNUNET_NETWORK_socket_recvfrom (dnsout,
 846                                         buf,
 847                                         sizeof (buf),
 848                                         (struct sockaddr *) &addr, &addrlen);
 849
 850     if (r < 0)
 851       {
 852         unhijack (dnsoutport);
 853         open_port ();
 854         GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS, hijack, NULL);
 855         return;
 856       }
 857
 858     if (query_states[dns->s.id].valid == GNUNET_YES)
 859       {
 860         if (query_states[dns->s.id].tunnel != NULL)
 861           {
 862             uint32_t *c = GNUNET_malloc(4 + r);
 863             *c = r;
 864             memcpy(c+1, dns, r);
 865             GNUNET_MESH_notify_transmit_ready (query_states[dns->s.id].tunnel,
 866                                                GNUNET_YES,
 867                                                32,
 868                                                GNUNET_TIME_UNIT_MINUTES,
 869                                                NULL, r + sizeof(struct GNUNET_MessageHeader), mesh_send_response, c);
 870           }
 871         else
 872           {
 873             query_states[dns->s.id].valid = GNUNET_NO;
 874
 875             size_t len = sizeof (struct answer_packet) + r - 1; /* 1 for the unsigned char data[1]; */
 876             struct answer_packet_list *answer =
 877               GNUNET_malloc (len + 2 * sizeof (struct answer_packet_list *));
 878             answer->pkt.hdr.type =
 879               htons (GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 880             answer->pkt.hdr.size = htons (len);
 881             answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_IP;
 882             answer->pkt.from = addr.sin_addr.s_addr;
 883             answer->pkt.to = query_states[dns->s.id].local_ip;
 884             answer->pkt.dst_port = query_states[dns->s.id].local_port;
 885             memcpy (answer->pkt.data, buf, r);
 886
 887             GNUNET_CONTAINER_DLL_insert_after (head, tail, tail, answer);
 888
 889             GNUNET_SERVER_notify_transmit_ready (query_states[dns->s.id].
 890                                                  client, len,
 891                                                  GNUNET_TIME_UNIT_FOREVER_REL,
 892                                                  &send_answer,
 893                                                  query_states[dns->s.id].
 894                                                  client);
 895           }
 896       }
 897   }
 898   GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
 899                                  dnsout, &read_response, NULL);
 900 }
 901
 902
 903 /**
 904  * Task run during shutdown.
 905  *
 906  * @param cls unused
 907  * @param tc unused
 908  */
 909 static void
 910 cleanup_task (void *cls __attribute__((unused)),
 911               const struct GNUNET_SCHEDULER_TaskContext *tc)
 912 {
 913   GNUNET_assert(0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN));
 914
 915   unhijack(dnsoutport);
 916   GNUNET_DHT_disconnect(dht);
 917 }
 918
 919 /**
 920  * @brief Create a port-map from udp and tcp redirects
 921  *
 922  * @param udp_redirects
 923  * @param tcp_redirects
 924  *
 925  * @return
 926  */
 927 uint64_t
 928 get_port_from_redirects (const char *udp_redirects, const char *tcp_redirects)
 929 {
 930   uint64_t ret = 0;
 931   char* cpy, *hostname, *redirect;
 932   int local_port, count = 0;
 933
 934   if (NULL != udp_redirects)
 935     {
 936       cpy = GNUNET_strdup (udp_redirects);
 937       for (redirect = strtok (cpy, " "); redirect != NULL; redirect = strtok (NULL, " "))
 938         {
 939           if (NULL == (hostname = strstr (redirect, ":")))
 940             {
 941               GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: option %s is not formatted correctly!\n", redirect);
 942               continue;
 943             }
 944           hostname[0] = '\0';
 945           local_port = atoi (redirect);
 946           if (!((local_port > 0) && (local_port < 65536)))
 947             GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: %s is not a correct port.", redirect);
 948
 949           ret |= (0xFFFF & htons(local_port));
 950           ret <<= 16;
 951           count ++;
 952
 953           if(count > 4)
 954             {
 955               ret = 0;
 956               goto out;
 957             }
 958         }
 959       GNUNET_free(cpy);
 960       cpy = NULL;
 961     }
 962
 963   if (NULL != tcp_redirects)
 964     {
 965       cpy = GNUNET_strdup (tcp_redirects);
 966       for (redirect = strtok (cpy, " "); redirect != NULL; redirect = strtok (NULL, " "))
 967         {
 968           if (NULL == (hostname = strstr (redirect, ":")))
 969             {
 970               GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: option %s is not formatted correctly!\n", redirect);
 971               continue;
 972             }
 973           hostname[0] = '\0';
 974           local_port = atoi (redirect);
 975           if (!((local_port > 0) && (local_port < 65536)))
 976             GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: %s is not a correct port.", redirect);
 977
 978           ret |= (0xFFFF & htons(local_port));
 979           ret <<= 16;
 980           count ++;
 981
 982           if(count > 4)
 983             {
 984               ret = 0;
 985               goto out;
 986             }
 987         }
 988       GNUNET_free(cpy);
 989       cpy = NULL;
 990     }
 991
 992 out:
 993   if (NULL != cpy)
 994     GNUNET_free(cpy);
 995   return ret;
 996 }
 997
 998 void
 999 publish_name (const char *name, uint64_t ports, uint32_t service_type,
1000               struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key)
1001 {
1002   size_t size = sizeof (struct GNUNET_DNS_Record);
1003   struct GNUNET_DNS_Record data;
1004   memset (&data, 0, size);
1005
1006   data.purpose.size =
1007     htonl (size - sizeof (struct GNUNET_CRYPTO_RsaSignature));
1008   data.purpose.purpose = GNUNET_SIGNATURE_PURPOSE_DNS_RECORD;
1009
1010   GNUNET_CRYPTO_hash (name, strlen (name) + 1, &data.service_descriptor);
1011   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Store with key1 %x\n",
1012               *((unsigned long long *) &data.service_descriptor));
1013
1014   data.service_type = service_type;
1015   data.ports = ports;
1016
1017   GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &data.peer);
1018
1019   data.expiration_time =
1020     GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_HOURS, 2));
1021
1022   /* Sign the block */
1023   if (GNUNET_OK != GNUNET_CRYPTO_rsa_sign (my_private_key,
1024                                            &data.purpose, &data.signature))
1025     {
1026       GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "could not sign DNS_Record\n");
1027       return;
1028     }
1029
1030   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1031               "Putting with key %08x, size = %d\n",
1032               *((unsigned int *) &data.service_descriptor), size);
1033
1034   GNUNET_DHT_put (dht,
1035                   &data.service_descriptor,
1036                   DEFAULT_PUT_REPLICATION,
1037                   GNUNET_DHT_RO_NONE,
1038                   GNUNET_BLOCK_TYPE_DNS,
1039                   size,
1040                   (char *) &data,
1041                   GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_HOURS),
1042                   GNUNET_TIME_UNIT_MINUTES, NULL, NULL);
1043 }
1044
1045 /**
1046  * @brief Publishes the record defined by the section section
1047  *
1048  * @param cls closure
1049  * @param section the current section
1050  */
1051 void
1052 publish_iterate (void *cls __attribute__((unused)), const char *section)
1053 {
1054   if ((strlen(section) < 8) || (0 != strcmp (".gnunet.", section + (strlen(section) - 8))))
1055     return;
1056
1057   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Parsing dns-name %s\n", section);
1058
1059   char *udp_redirects, *tcp_redirects, *alternative_names, *alternative_name,
1060     *keyfile;
1061
1062   GNUNET_CONFIGURATION_get_value_string (cfg, section,
1063                                          "UDP_REDIRECTS", &udp_redirects);
1064   GNUNET_CONFIGURATION_get_value_string (cfg, section, "TCP_REDIRECTS",
1065                                          &tcp_redirects);
1066
1067   if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (cfg, "GNUNETD",
1068                                                             "HOSTKEY",
1069                                                             &keyfile))
1070     {
1071       GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "could not read keyfile-value\n");
1072       if (keyfile != NULL)
1073         GNUNET_free (keyfile);
1074       return;
1075     }
1076
1077   struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key =
1078     GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
1079   GNUNET_free (keyfile);
1080   GNUNET_assert (my_private_key != NULL);
1081
1082   uint64_t ports = get_port_from_redirects (udp_redirects, tcp_redirects);
1083   uint32_t service_type = 0;
1084
1085   if (NULL != udp_redirects)
1086     service_type = GNUNET_DNS_SERVICE_TYPE_UDP;
1087
1088   if (NULL != tcp_redirects)
1089     service_type |= GNUNET_DNS_SERVICE_TYPE_TCP;
1090
1091   service_type = htonl (service_type);
1092
1093
1094   publish_name (section, ports, service_type, my_private_key);
1095
1096   GNUNET_CONFIGURATION_get_value_string (cfg, section,
1097                                          "ALTERNATIVE_NAMES",
1098                                          &alternative_names);
1099   for (alternative_name = strtok (alternative_names, " ");
1100        alternative_name != NULL; alternative_name = strtok (NULL, " "))
1101     {
1102       char *altname =
1103         alloca (strlen (alternative_name) + strlen (section) + 1 + 1);
1104       strcpy (altname, alternative_name);
1105       strcpy (altname + strlen (alternative_name) + 1, section);
1106       altname[strlen (alternative_name)] = '.';
1107
1108       publish_name (altname, ports, service_type, my_private_key);
1109     }
1110
1111   GNUNET_free_non_null(alternative_names);
1112   GNUNET_CRYPTO_rsa_key_free (my_private_key);
1113   GNUNET_free_non_null (udp_redirects);
1114   GNUNET_free_non_null (tcp_redirects);
1115 }
1116
1117 /**
1118  * Publish a DNS-record in the DHT.
1119  */
1120 static void
1121 publish_names (void *cls __attribute__((unused)),
1122                const struct GNUNET_SCHEDULER_TaskContext *tc) {
1123     if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1124       return;
1125
1126     GNUNET_CONFIGURATION_iterate_sections(cfg, publish_iterate, NULL);
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 const struct GNUNET_MESH_MessageHandler mesh_handlers[] = {
1152     {receive_mesh_query, GNUNET_MESSAGE_TYPE_REMOTE_QUERY_DNS, 0},
1153     {receive_mesh_answer, GNUNET_MESSAGE_TYPE_REMOTE_ANSWER_DNS, 0},
1154     {NULL, 0, 0}
1155   };
1156
1157   static GNUNET_MESH_ApplicationType *apptypes;
1158
1159   if (GNUNET_YES ==
1160       GNUNET_CONFIGURATION_get_value_yesno (cfg_, "dns", "PROVIDE_EXIT"))
1161     apptypes = (GNUNET_MESH_ApplicationType[])
1162     {
1163     GNUNET_APPLICATION_TYPE_INTERNET_RESOLVER,
1164     GNUNET_APPLICATION_TYPE_END};
1165   else
1166   apptypes = (GNUNET_MESH_ApplicationType[])
1167   {
1168   GNUNET_APPLICATION_TYPE_END};
1169
1170   mesh_handle =
1171     GNUNET_MESH_connect (cfg_, NULL, NULL, mesh_handlers, apptypes);
1172
1173   cfg = cfg_;
1174
1175   unsigned int i;
1176   for (i = 0; i < 65536; i++)
1177     {
1178       query_states[i].valid = GNUNET_NO;
1179     }
1180
1181   dht = GNUNET_DHT_connect (cfg, 1024);
1182
1183   open_port ();
1184
1185   GNUNET_SCHEDULER_add_now (publish_names, NULL);
1186
1187   GNUNET_SERVER_add_handlers (server, handlers);
1188   GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
1189                                 &cleanup_task, cls);
1190 }
1191
1192 /**
1193  * The main function for the dns service.
1194  *
1195  * @param argc number of arguments from the command line
1196  * @param argv command line arguments
1197  * @return 0 ok, 1 on error
1198  */
1199 int
1200 main (int argc, char *const *argv)
1201 {
1202   return (GNUNET_OK ==
1203           GNUNET_SERVICE_run (argc,
1204                               argv,
1205                               "dns",
1206                               GNUNET_SERVICE_OPTION_NONE,
1207                               &run, NULL)) ? 0 : 1;
1208 }