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_constants.h>
  29 #include "gnunet_network_lib.h"
  30 #include "gnunet_os_lib.h"
  31 #include "gnunet-service-dns-p.h"
  32 #include "gnunet_protocols.h"
  33 #include "gnunet_applications.h"
  34 #include "gnunet-vpn-packet.h"
  35 #include "gnunet_container_lib.h"
  36 #include "gnunet-dns-parser.h"
  37 #include "gnunet_dht_service.h"
  38 #include "gnunet_block_lib.h"
  39 #include "block_dns.h"
  40 #include "gnunet_crypto_lib.h"
  41 #include "gnunet_mesh_service.h"
  42 #include "gnunet_signatures.h"
  43
  44 struct GNUNET_MESH_Handle *mesh_handle;
  45
  46 /**
  47  * The tunnel to send queries
  48  */
  49 static struct GNUNET_MESH_Tunnel* dns_tunnel;
  50
  51 /**
  52  * The UDP-Socket through which DNS-Resolves will be sent if they are not to be
  53  * sent through gnunet. The port of this socket will not be hijacked.
  54  */
  55 static struct GNUNET_NETWORK_Handle *dnsout;
  56
  57 /**
  58  * The port bound to the socket dnsout
  59  */
  60 static unsigned short dnsoutport;
  61
  62 /**
  63  * A handle to the DHT-Service
  64  */
  65 static struct GNUNET_DHT_Handle *dht;
  66
  67 /**
  68  * The configuration to use
  69  */
  70 static const struct GNUNET_CONFIGURATION_Handle *cfg;
  71
  72 /**
  73  * A list of DNS-Responses that have to be sent to the requesting client
  74  */
  75 static struct answer_packet_list *head;
  76
  77 /**
  78  * The tail of the list of DNS-responses
  79  */
  80 static struct answer_packet_list *tail;
  81
  82 /**
  83  * A structure containing a mapping from network-byte-ordered DNS-id (16 bit) to
  84  * some information needed to handle this query
  85  *
  86  * It currently allocates at least
  87  * (1 + machine-width + machine-width + 32 + 32 + 16 + machine-width + 8) * 65536 bit
  88  * = 17 MiB on 64 bit.
  89  * = 11 MiB on 32 bit.
  90  */
  91 static struct {
  92     unsigned valid:1;
  93     struct GNUNET_SERVER_Client* client;
  94     struct GNUNET_MESH_Tunnel *tunnel;
  95     uint32_t local_ip;
  96     uint32_t remote_ip;
  97     uint16_t local_port;
  98     char* name;
  99     uint8_t namelen;
 100 } query_states[UINT16_MAX];
 101
 102 /**
 103  * A struct used to give more than one value as
 104  * closure to receive_dht
 105  */
 106 struct receive_dht_cls {
 107     uint16_t id;
 108     struct GNUNET_DHT_GetHandle* handle;
 109 };
 110
 111 struct tunnel_notify_queue
 112 {
 113   struct tunnel_notify_queue* next;
 114   struct tunnel_notify_queue* prev;
 115   void* cls;
 116   size_t len;
 117   GNUNET_CONNECTION_TransmitReadyNotify cb;
 118 };
 119
 120 /**
 121  * Hijack all outgoing DNS-Traffic but for traffic leaving "our" port.
 122  */
 123 static void
 124 hijack (void *cls __attribute__((unused)), const struct GNUNET_SCHEDULER_TaskContext *tc)
 125 {
 126   if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
 127     return;
 128
 129   if (0 == dnsoutport)
 130     {
 131       GNUNET_log(GNUNET_ERROR_TYPE_INFO, "Delaying the hijacking, port is still %d!\n", dnsoutport);
 132       GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_UNIT_SECONDS, hijack, NULL);
 133       return;
 134     }
 135
 136   char port_s[6];
 137   char *virt_dns;
 138   struct GNUNET_OS_Process *proc;
 139
 140   if (GNUNET_SYSERR ==
 141       GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "VIRTDNS",
 142                                              &virt_dns))
 143     {
 144       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 145                   "No entry 'VIRTDNS' in configuration!\n");
 146       exit (1);
 147     }
 148
 149   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Hijacking, port is %d\n", dnsoutport);
 150   snprintf (port_s, 6, "%d", dnsoutport);
 151   if (NULL != (proc = GNUNET_OS_start_process (NULL,
 152                                                NULL,
 153                                                "gnunet-helper-hijack-dns",
 154                                                "gnunet-hijack-dns",
 155                                                port_s, virt_dns, NULL)))
 156     GNUNET_OS_process_close (proc);
 157   GNUNET_free (virt_dns);
 158 }
 159
 160 /**
 161  * Delete the hijacking-routes
 162  */
 163 static void
 164 unhijack (unsigned short port)
 165 {
 166   char port_s[6];
 167   char *virt_dns;
 168   struct GNUNET_OS_Process *proc;
 169
 170   if (GNUNET_SYSERR ==
 171       GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "VIRTDNS",
 172                                              &virt_dns))
 173     {
 174       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 175                   "No entry 'VIRTDNS' in configuration!\n");
 176       exit (1);
 177     }
 178
 179   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "unHijacking, port is %d\n", port);
 180   snprintf (port_s, 6, "%d", port);
 181   if (NULL != (proc = GNUNET_OS_start_process (NULL,
 182                                                NULL,
 183                                                "gnunet-helper-hijack-dns",
 184                                                "gnunet-hijack-dns",
 185                                                "-d", port_s, virt_dns, NULL)))
 186     GNUNET_OS_process_close (proc);
 187   GNUNET_free (virt_dns);
 188 }
 189
 190 /**
 191  * Send the DNS-Response to the client. Gets called via the notify_transmit_ready-
 192  * system.
 193  */
 194 static size_t
 195 send_answer(void* cls, size_t size, void* buf) {
 196     struct answer_packet_list* query = head;
 197     size_t len = ntohs(query->pkt.hdr.size);
 198
 199     GNUNET_assert(len <= size);
 200
 201     memcpy(buf, &query->pkt.hdr, len);
 202
 203     GNUNET_CONTAINER_DLL_remove (head, tail, query);
 204
 205     GNUNET_free(query);
 206
 207     /* When more data is to be sent, reschedule */
 208     if (head != NULL)
 209       GNUNET_SERVER_notify_transmit_ready(cls,
 210                                           ntohs(head->pkt.hdr.size),
 211                                           GNUNET_TIME_UNIT_FOREVER_REL,
 212                                           &send_answer,
 213                                           cls);
 214
 215     return len;
 216 }
 217
 218 struct tunnel_cls {
 219     struct GNUNET_MESH_Tunnel *tunnel GNUNET_PACKED;
 220     struct GNUNET_MessageHeader hdr;
 221     struct dns_pkt dns;
 222 };
 223
 224 struct tunnel_cls *remote_pending[UINT16_MAX];
 225
 226 static size_t
 227 mesh_send_response (void *cls, size_t size, void *buf)
 228 {
 229   GNUNET_assert (size >= sizeof (struct GNUNET_MessageHeader));
 230   struct GNUNET_MessageHeader *hdr = buf;
 231   uint32_t *sz = cls;
 232   struct GNUNET_MESH_Tunnel **tunnel = (struct GNUNET_MESH_Tunnel**)(sz+1);
 233   struct dns_pkt *dns = (struct dns_pkt *) (tunnel + 1);
 234   hdr->type = htons (GNUNET_MESSAGE_TYPE_REMOTE_ANSWER_DNS);
 235   hdr->size = htons (*sz + sizeof (struct GNUNET_MessageHeader));
 236
 237   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 238               "Sending response, size=%d, sz=%d, sz+hdr=%d\n", size, *sz,
 239               *sz + sizeof (struct GNUNET_MessageHeader));
 240
 241   GNUNET_assert (size >= (*sz + sizeof (struct GNUNET_MessageHeader)));
 242
 243   memcpy (hdr + 1, dns, *sz);
 244
 245   if (NULL != GNUNET_MESH_tunnel_get_head(*tunnel))
 246     {
 247       struct tunnel_notify_queue* element = GNUNET_MESH_tunnel_get_head(*tunnel);
 248       struct tunnel_notify_queue* head = GNUNET_MESH_tunnel_get_head(*tunnel);
 249       struct tunnel_notify_queue* tail = GNUNET_MESH_tunnel_get_tail(*tunnel);
 250
 251       GNUNET_CONTAINER_DLL_remove(head, tail, element);
 252
 253       GNUNET_MESH_tunnel_set_head(*tunnel, head);
 254       GNUNET_MESH_tunnel_set_tail(*tunnel, tail);
 255       struct GNUNET_MESH_TransmitHandle* th = GNUNET_MESH_notify_transmit_ready (*tunnel,
 256                                                                                  GNUNET_NO,
 257                                                                                  42,
 258                                                                                  GNUNET_TIME_relative_divide
 259                                                                                  (GNUNET_CONSTANTS_MAX_CORK_DELAY, 2),
 260                                                                                  (const struct GNUNET_PeerIdentity *)
 261                                                                                  NULL, element->len,
 262                                                                                  element->cb, element->cls);
 263       /* save the handle */
 264       GNUNET_MESH_tunnel_set_data(*tunnel, th);
 265     }
 266
 267   GNUNET_free (cls);
 268
 269   return ntohs (hdr->size);
 270 }
 271
 272 static size_t
 273 mesh_send (void *cls, size_t size, void *buf)
 274 {
 275   struct tunnel_cls *cls_ = (struct tunnel_cls *) cls;
 276   GNUNET_MESH_tunnel_set_data(cls_->tunnel, NULL);
 277
 278   GNUNET_assert(cls_->hdr.size <= size);
 279
 280   size = cls_->hdr.size;
 281   cls_->hdr.size = htons(cls_->hdr.size);
 282
 283   memcpy(buf, &cls_->hdr, size);
 284
 285   if (NULL != GNUNET_MESH_tunnel_get_head(cls_->tunnel))
 286     {
 287       struct tunnel_notify_queue* element = GNUNET_MESH_tunnel_get_head(cls_->tunnel);
 288       struct tunnel_notify_queue* head = GNUNET_MESH_tunnel_get_head(cls_->tunnel);
 289       struct tunnel_notify_queue* tail = GNUNET_MESH_tunnel_get_tail(cls_->tunnel);
 290
 291       GNUNET_CONTAINER_DLL_remove(head, tail, element);
 292
 293       GNUNET_MESH_tunnel_set_head(cls_->tunnel, head);
 294       GNUNET_MESH_tunnel_set_tail(cls_->tunnel, tail);
 295       struct GNUNET_MESH_TransmitHandle* th = GNUNET_MESH_notify_transmit_ready (cls_->tunnel,
 296                                                                                  GNUNET_NO,
 297                                                                                  42,
 298                                                                                  GNUNET_TIME_relative_divide
 299                                                                                  (GNUNET_CONSTANTS_MAX_CORK_DELAY, 2),
 300                                                                                  (const struct GNUNET_PeerIdentity *)
 301                                                                                  NULL, element->len,
 302                                                                                  element->cb, element->cls);
 303       /* save the handle */
 304       GNUNET_MESH_tunnel_set_data(cls_->tunnel, th);
 305       GNUNET_free(element);
 306     }
 307
 308   return size;
 309 }
 310
 311
 312 void
 313 mesh_connect (void *cls, const struct GNUNET_PeerIdentity *peer,
 314               const struct GNUNET_TRANSPORT_ATS_Information *atsi
 315               __attribute__ ((unused)))
 316 {
 317   if (NULL == peer)
 318     return;
 319   struct tunnel_cls *cls_ = (struct tunnel_cls *) cls;
 320   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
 321               "Connected to peer %s, sending query with id %d\n",
 322               GNUNET_i2s (peer), ntohs (cls_->dns.s.id));
 323
 324   if (NULL == GNUNET_MESH_tunnel_get_data (cls_->tunnel))
 325     {
 326       struct GNUNET_MESH_TransmitHandle *th =
 327         GNUNET_MESH_notify_transmit_ready (cls_->tunnel,
 328                                            GNUNET_YES,
 329                                            42,
 330                                            GNUNET_TIME_UNIT_MINUTES,
 331                                            NULL,
 332                                            cls_->hdr.size,
 333                                            mesh_send,
 334                                            cls);
 335
 336       GNUNET_MESH_tunnel_set_data (cls_->tunnel, th);
 337     }
 338   else
 339     {
 340       struct tunnel_notify_queue* head = GNUNET_MESH_tunnel_get_head(cls_->tunnel);
 341       struct tunnel_notify_queue* tail = GNUNET_MESH_tunnel_get_tail(cls_->tunnel);
 342
 343       struct tunnel_notify_queue* element = GNUNET_malloc(sizeof(struct tunnel_notify_queue));
 344       element->cls = cls;
 345       element->len = cls_->hdr.size;
 346       element->cb = mesh_send;
 347
 348       GNUNET_CONTAINER_DLL_insert_tail(head, tail, element);
 349       GNUNET_MESH_tunnel_set_head(cls_->tunnel, head);
 350       GNUNET_MESH_tunnel_set_tail(cls_->tunnel, tail);
 351     }
 352 }
 353
 354
 355 static void
 356 send_mesh_query (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
 357 {
 358   if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
 359     return;
 360
 361   struct tunnel_cls *cls_ = (struct tunnel_cls*)cls;
 362
 363   if (NULL == dns_tunnel)
 364     dns_tunnel = GNUNET_MESH_peer_request_connect_by_type(mesh_handle,
 365                                                           GNUNET_TIME_UNIT_HOURS,
 366                                                           GNUNET_APPLICATION_TYPE_INTERNET_RESOLVER,
 367                                                           mesh_connect,
 368                                                           NULL,
 369                                                           cls_);
 370   cls_->tunnel = dns_tunnel;
 371   remote_pending[cls_->dns.s.id] = cls_;
 372 }
 373
 374 static int
 375 receive_mesh_query (void *cls __attribute__((unused)),
 376                     struct GNUNET_MESH_Tunnel *tunnel,
 377                     void **ctx __attribute__((unused)),
 378                     const struct GNUNET_PeerIdentity *sender __attribute__((unused)),
 379                     const struct GNUNET_MessageHeader *message,
 380                     const struct GNUNET_TRANSPORT_ATS_Information *atsi __attribute__((unused)))
 381 {
 382   struct dns_pkt *dns = (struct dns_pkt*)(message + 1);
 383
 384   struct sockaddr_in dest;
 385   memset(&dest, 0, sizeof dest);
 386   dest.sin_port = htons(53);
 387   /* TODO: read from config */
 388   inet_pton(AF_INET, "8.8.8.8", &dest.sin_addr);
 389
 390   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Querying for remote, id=%d\n", ntohs(dns->s.id));
 391   query_states[dns->s.id].tunnel = tunnel;
 392   query_states[dns->s.id].valid = GNUNET_YES;
 393
 394   GNUNET_NETWORK_socket_sendto(dnsout,
 395                                dns,
 396                                ntohs(message->size) - sizeof(struct GNUNET_MessageHeader),
 397                                (struct sockaddr*) &dest,
 398                                sizeof dest);
 399
 400   return GNUNET_SYSERR;
 401 }
 402
 403 static int
 404 receive_mesh_answer (void *cls __attribute__((unused)),
 405                      struct GNUNET_MESH_Tunnel *tunnel,
 406                      void **ctx __attribute__((unused)),
 407                      const struct GNUNET_PeerIdentity *sender,
 408                      const struct GNUNET_MessageHeader *message,
 409                      const struct GNUNET_TRANSPORT_ATS_Information *atsi __attribute__((unused)))
 410 {
 411   /* TODo: size check */
 412   struct dns_pkt *dns = (struct dns_pkt *) (message + 1);
 413
 414   /* They sent us a packet we were not waiting for */
 415   if (remote_pending[dns->s.id] == NULL
 416       || remote_pending[dns->s.id]->tunnel != tunnel)
 417     return GNUNET_OK;
 418
 419   GNUNET_free(remote_pending[dns->s.id]);
 420   remote_pending[dns->s.id] = NULL;
 421
 422   if (query_states[dns->s.id].valid != GNUNET_YES)
 423     return GNUNET_SYSERR;
 424   query_states[dns->s.id].valid = GNUNET_NO;
 425
 426   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Received answer from peer %s, dns-id %d\n", GNUNET_i2s(sender), ntohs(dns->s.id));
 427
 428   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 */
 429     + sizeof (struct dns_record_line) - 1 + 16; /* To hold the IPv6-Address */
 430
 431   struct answer_packet_list *answer =
 432     GNUNET_malloc (len + 2 * sizeof (struct answer_packet_list *));
 433   memset (answer, 0, len + 2 * sizeof (struct answer_packet_list *));
 434
 435   answer->pkt.hdr.type = htons (GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 436   answer->pkt.hdr.size = htons (len);
 437
 438   struct dns_pkt_parsed* pdns = parse_dns_packet(dns);
 439
 440   if (ntohs(pdns->s.ancount) < 1)
 441     {
 442       GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Answer only contains %d answers.\n", ntohs(pdns->s.ancount));
 443       free_parsed_dns_packet(pdns);
 444       return GNUNET_OK;
 445     }
 446
 447   answer->pkt.addrsize = ntohs(pdns->answers[0]->data_len);
 448   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "The first answer has the addrlen %d\n", answer->pkt.addrsize);
 449   memcpy(answer->pkt.addr, pdns->answers[0]->data, ntohs(pdns->answers[0]->data_len));
 450
 451   answer->pkt.from = query_states[dns->s.id].remote_ip;
 452
 453   answer->pkt.to = query_states[dns->s.id].local_ip;
 454   answer->pkt.dst_port = query_states[dns->s.id].local_port;
 455
 456   struct dns_pkt *dpkt = (struct dns_pkt *) answer->pkt.data;
 457
 458   dpkt->s.id = dns->s.id;
 459   dpkt->s.aa = 1;
 460   dpkt->s.qr = 1;
 461   dpkt->s.ra = 1;
 462   dpkt->s.qdcount = htons (1);
 463   dpkt->s.ancount = htons (1);
 464
 465   memcpy (dpkt->data, query_states[dns->s.id].name,
 466           query_states[dns->s.id].namelen);
 467   GNUNET_free (query_states[dns->s.id].name);
 468
 469   struct dns_query_line *dque =
 470     (struct dns_query_line *) (dpkt->data +
 471                                (query_states[dns->s.id].namelen));
 472
 473   struct dns_record_line *drec_data =
 474     (struct dns_record_line *) (dpkt->data +
 475                                 (query_states[dns->s.id].namelen) +
 476                                 sizeof (struct dns_query_line) + 2);
 477   if (16 == answer->pkt.addrsize)
 478     {
 479       answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_REMOTE_AAAA;
 480       dque->type = htons (28);      /* AAAA */
 481       drec_data->type = htons (28); /* AAAA */
 482       drec_data->data_len = htons (16);
 483     }
 484   else
 485     {
 486       answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_REMOTE_A;
 487       dque->type = htons (1);      /* A */
 488       drec_data->type = htons (1); /* A*/
 489       drec_data->data_len = htons (4);
 490     }
 491   dque->class = htons (1);      /* IN */
 492
 493   char *anname =
 494     (char *) (dpkt->data + (query_states[dns->s.id].namelen) +
 495               sizeof (struct dns_query_line));
 496   memcpy (anname, "\xc0\x0c", 2);
 497   drec_data->class = htons (1); /* IN */
 498
 499   drec_data->ttl = pdns->answers[0]->ttl;
 500
 501   /* Calculate at which offset in the packet the IPv6-Address belongs, it is
 502    * filled in by the daemon-vpn */
 503   answer->pkt.addroffset =
 504     htons ((unsigned short) ((unsigned long) (&drec_data->data) -
 505                              (unsigned long) (&answer->pkt)));
 506
 507   GNUNET_CONTAINER_DLL_insert_after (head, tail, tail, answer);
 508
 509   GNUNET_SERVER_notify_transmit_ready (query_states[dns->s.id].client,
 510                                        len,
 511                                        GNUNET_TIME_UNIT_FOREVER_REL,
 512                                        &send_answer,
 513                                        query_states[dns->s.id].client);
 514
 515   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Sent answer of length %d on to client, addroffset = %d\n", len, answer->pkt.addroffset);
 516
 517   free_parsed_dns_packet(pdns);
 518   return GNUNET_OK;
 519 }
 520
 521
 522 static void
 523 send_rev_query(void * cls, const struct GNUNET_SCHEDULER_TaskContext *tc) {
 524     if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
 525       return;
 526
 527     struct dns_pkt_parsed* pdns = (struct dns_pkt_parsed*) cls;
 528
 529     unsigned short id = pdns->s.id;
 530
 531     free_parsed_dns_packet(pdns);
 532
 533     if (query_states[id].valid != GNUNET_YES) return;
 534     query_states[id].valid = GNUNET_NO;
 535
 536     GNUNET_assert(query_states[id].namelen == 74);
 537
 538     size_t len = sizeof(struct answer_packet) - 1 \
 539                  + sizeof(struct dns_static) \
 540                  + 74 /* this is the length of a reverse ipv6-lookup */ \
 541                  + sizeof(struct dns_query_line) \
 542                  + 2 /* To hold the pointer (as defined in RFC1035) to the name */ \
 543                  + sizeof(struct dns_record_line) - 1 \
 544                  - 2 /* We do not know the lenght of the answer yet*/;
 545
 546     struct answer_packet_list* answer = GNUNET_malloc(len + 2*sizeof(struct answer_packet_list*));
 547     memset(answer, 0, len + 2*sizeof(struct answer_packet_list*));
 548
 549     answer->pkt.hdr.type = htons(GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 550     answer->pkt.hdr.size = htons(len);
 551     answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_REV;
 552
 553     answer->pkt.from = query_states[id].remote_ip;
 554
 555     answer->pkt.to = query_states[id].local_ip;
 556     answer->pkt.dst_port = query_states[id].local_port;
 557
 558     struct dns_pkt *dpkt = (struct dns_pkt*)answer->pkt.data;
 559
 560     dpkt->s.id = id;
 561     dpkt->s.aa = 1;
 562     dpkt->s.qr = 1;
 563     dpkt->s.ra = 1;
 564     dpkt->s.qdcount = htons(1);
 565     dpkt->s.ancount = htons(1);
 566
 567     memcpy(dpkt->data, query_states[id].name, query_states[id].namelen);
 568     GNUNET_free(query_states[id].name);
 569
 570     struct dns_query_line* dque = (struct dns_query_line*)(dpkt->data+(query_states[id].namelen));
 571     dque->type = htons(12); /* PTR */
 572     dque->class = htons(1); /* IN */
 573
 574     char* anname = (char*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line));
 575     memcpy(anname, "\xc0\x0c", 2);
 576
 577     struct dns_record_line *drec_data = (struct dns_record_line*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line)+2);
 578     drec_data->type = htons(12); /* AAAA */
 579     drec_data->class = htons(1); /* IN */
 580     /* FIXME: read the TTL from block:
 581      * GNUNET_TIME_absolute_get_remaining(rec->expiration_time)
 582      *
 583      * But how to get the seconds out of this?
 584      */
 585     drec_data->ttl = htonl(3600);
 586
 587     /* Calculate at which offset in the packet the length of the name and the
 588      * name, it is filled in by the daemon-vpn */
 589     answer->pkt.addroffset = htons((unsigned short)((unsigned long)(&drec_data->data_len)-(unsigned long)(&answer->pkt)));
 590
 591     GNUNET_CONTAINER_DLL_insert_after(head, tail, tail, answer);
 592
 593     GNUNET_SERVER_notify_transmit_ready(query_states[id].client,
 594                                         len,
 595                                         GNUNET_TIME_UNIT_FOREVER_REL,
 596                                         &send_answer,
 597                                         query_states[id].client);
 598 }
 599
 600 /**
 601  * Receive a block from the dht.
 602  */
 603 static void
 604 receive_dht(void *cls,
 605             struct GNUNET_TIME_Absolute exp __attribute__((unused)),
 606             const GNUNET_HashCode *key __attribute__((unused)),
 607             const struct GNUNET_PeerIdentity *const *get_path __attribute__((unused)),
 608             const struct GNUNET_PeerIdentity *const *put_path __attribute__((unused)),
 609             enum GNUNET_BLOCK_Type type,
 610             size_t size,
 611             const void *data) {
 612
 613     unsigned short id = ((struct receive_dht_cls*)cls)->id;
 614     struct GNUNET_DHT_GetHandle* handle = ((struct receive_dht_cls*)cls)->handle;
 615     GNUNET_free(cls);
 616
 617     GNUNET_assert(type == GNUNET_BLOCK_TYPE_DNS);
 618
 619     /* If no query with this id is pending, ignore the block */
 620     if (query_states[id].valid != GNUNET_YES) return;
 621     query_states[id].valid = GNUNET_NO;
 622
 623     const struct GNUNET_DNS_Record* rec = data;
 624     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 625                "Got block of size %d, peer: %08x, desc: %08x\n",
 626                size,
 627                *((unsigned int*)&rec->peer),
 628                *((unsigned int*)&rec->service_descriptor));
 629
 630     size_t len = sizeof(struct answer_packet) - 1 \
 631                  + sizeof(struct dns_static) \
 632                  + query_states[id].namelen \
 633                  + sizeof(struct dns_query_line) \
 634                  + 2 /* To hold the pointer (as defined in RFC1035) to the name */ \
 635                  + sizeof(struct dns_record_line) - 1 \
 636                  + 16; /* To hold the IPv6-Address */
 637
 638     struct answer_packet_list* answer = GNUNET_malloc(len + 2*sizeof(struct answer_packet_list*));
 639     memset(answer, 0, len + 2*sizeof(struct answer_packet_list*));
 640
 641     answer->pkt.hdr.type = htons(GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
 642     answer->pkt.hdr.size = htons(len);
 643     answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_SERVICE;
 644
 645     GNUNET_CRYPTO_hash(&rec->peer,
 646                        sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
 647                        &answer->pkt.service_descr.peer);
 648
 649     memcpy(&answer->pkt.service_descr.service_descriptor,
 650            &rec->service_descriptor,
 651            sizeof(GNUNET_HashCode));
 652     memcpy(&answer->pkt.service_descr.service_type,
 653            &rec->service_type,
 654            sizeof(answer->pkt.service_descr.service_type));
 655     memcpy(&answer->pkt.service_descr.ports, &rec->ports, sizeof(answer->pkt.service_descr.ports));
 656
 657     answer->pkt.from = query_states[id].remote_ip;
 658
 659     answer->pkt.to = query_states[id].local_ip;
 660     answer->pkt.dst_port = query_states[id].local_port;
 661
 662     struct dns_pkt *dpkt = (struct dns_pkt*)answer->pkt.data;
 663
 664     dpkt->s.id = id;
 665     dpkt->s.aa = 1;
 666     dpkt->s.qr = 1;
 667     dpkt->s.ra = 1;
 668     dpkt->s.qdcount = htons(1);
 669     dpkt->s.ancount = htons(1);
 670
 671     memcpy(dpkt->data, query_states[id].name, query_states[id].namelen);
 672     GNUNET_free(query_states[id].name);
 673
 674     struct dns_query_line* dque = (struct dns_query_line*)(dpkt->data+(query_states[id].namelen));
 675     dque->type = htons(28); /* AAAA */
 676     dque->class = htons(1); /* IN */
 677
 678     char* anname = (char*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line));
 679     memcpy(anname, "\xc0\x0c", 2);
 680
 681     struct dns_record_line *drec_data = (struct dns_record_line*)(dpkt->data+(query_states[id].namelen)+sizeof(struct dns_query_line)+2);
 682     drec_data->type = htons(28); /* AAAA */
 683     drec_data->class = htons(1); /* IN */
 684
 685     /* FIXME: read the TTL from block:
 686      * GNUNET_TIME_absolute_get_remaining(rec->expiration_time)
 687      *
 688      * But how to get the seconds out of this?
 689      */
 690     drec_data->ttl = htonl(3600);
 691     drec_data->data_len = htons(16);
 692
 693     /* Calculate at which offset in the packet the IPv6-Address belongs, it is
 694      * filled in by the daemon-vpn */
 695     answer->pkt.addroffset = htons((unsigned short)((unsigned long)(&drec_data->data)-(unsigned long)(&answer->pkt)));
 696
 697     GNUNET_CONTAINER_DLL_insert_after(head, tail, tail, answer);
 698
 699     GNUNET_SERVER_notify_transmit_ready(query_states[id].client,
 700                                         len,
 701                                         GNUNET_TIME_UNIT_FOREVER_REL,
 702                                         &send_answer,
 703                                         query_states[id].client);
 704
 705     GNUNET_DHT_get_stop(handle);
 706 }
 707
 708 /**
 709  * This receives a GNUNET_MESSAGE_TYPE_REHIJACK and rehijacks the DNS
 710  */
 711 static void
 712 rehijack(void *cls __attribute__((unused)),
 713          struct GNUNET_SERVER_Client *client,
 714          const struct GNUNET_MessageHeader *message __attribute__((unused))) {
 715     unhijack(dnsoutport);
 716     GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_UNIT_SECONDS, hijack, NULL);
 717
 718     GNUNET_SERVER_receive_done(client, GNUNET_OK);
 719 }
 720
 721 /**
 722  * This receives the dns-payload from the daemon-vpn and sends it on over the udp-socket
 723  */
 724 static void
 725 receive_query(void *cls __attribute__((unused)),
 726               struct GNUNET_SERVER_Client *client,
 727               const struct GNUNET_MessageHeader *message) {
 728     struct query_packet* pkt = (struct query_packet*)message;
 729     struct dns_pkt* dns = (struct dns_pkt*)pkt->data;
 730     struct dns_pkt_parsed* pdns = parse_dns_packet(dns);
 731
 732     query_states[dns->s.id].valid = GNUNET_YES;
 733     query_states[dns->s.id].client = client;
 734     query_states[dns->s.id].local_ip = pkt->orig_from;
 735     query_states[dns->s.id].local_port = pkt->src_port;
 736     query_states[dns->s.id].remote_ip = pkt->orig_to;
 737     query_states[dns->s.id].namelen = strlen((char*)dns->data) + 1;
 738     if (query_states[dns->s.id].name != NULL)
 739       GNUNET_free(query_states[dns->s.id].name);
 740     query_states[dns->s.id].name = GNUNET_malloc(query_states[dns->s.id].namelen);
 741     memcpy(query_states[dns->s.id].name, dns->data, query_states[dns->s.id].namelen);
 742
 743     /* The query is for a .gnunet-address */
 744     if (pdns->queries[0]->namelen > 9 &&
 745         0 == strncmp(pdns->queries[0]->name+(pdns->queries[0]->namelen - 9), ".gnunet.", 9))
 746       {
 747         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Query for .gnunet!\n");
 748         GNUNET_HashCode key;
 749         GNUNET_CRYPTO_hash(pdns->queries[0]->name, pdns->queries[0]->namelen, &key);
 750
 751         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 752                    "Getting with key %08x, len is %d\n",
 753                    *((unsigned int*)&key),
 754                    pdns->queries[0]->namelen);
 755
 756         struct receive_dht_cls* cls = GNUNET_malloc(sizeof(struct receive_dht_cls));
 757         cls->id = dns->s.id;
 758
 759         cls->handle = GNUNET_DHT_get_start(dht,
 760                                            GNUNET_TIME_UNIT_MINUTES,
 761                                            GNUNET_BLOCK_TYPE_DNS,
 762                                            &key,
 763                                            DEFAULT_GET_REPLICATION,
 764                                            GNUNET_DHT_RO_NONE,
 765                                            NULL,
 766                                            0,
 767                                            NULL,
 768                                            0,
 769                                            receive_dht,
 770                                            cls);
 771
 772         goto outfree;
 773       }
 774
 775     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Query for '%s'; namelen=%d\n", pdns->queries[0]->name, pdns->queries[0]->namelen);
 776
 777     /* This is a PTR-Query. Check if it is for "our" network */
 778     if (htons(pdns->queries[0]->qtype) == 12 &&
 779         74 == pdns->queries[0]->namelen)
 780       {
 781         char* ipv6addr;
 782         char ipv6[16];
 783         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.";
 784         unsigned int i;
 785         unsigned long long ipv6prefix;
 786         unsigned int comparelen;
 787
 788         GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_string(cfg, "vpn", "IPV6ADDR", &ipv6addr));
 789         inet_pton (AF_INET6, ipv6addr, ipv6);
 790         GNUNET_free(ipv6addr);
 791
 792         GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_number(cfg, "vpn", "IPV6PREFIX", &ipv6prefix));
 793         GNUNET_assert(ipv6prefix < 127);
 794         ipv6prefix = (ipv6prefix + 7)/8;
 795
 796         for (i = ipv6prefix; i < 16; i++)
 797           ipv6[i] = 0;
 798
 799         for (i = 0; i < 16; i++)
 800           {
 801             unsigned char c1 = ipv6[i] >> 4;
 802             unsigned char c2 = ipv6[i] & 0xf;
 803
 804             if (c1 <= 9)
 805               ipv6rev[62-(4*i)] = c1 + '0';
 806             else
 807               ipv6rev[62-(4*i)] = c1 + 87; /* 87 is the difference between 'a' and 10 */
 808
 809             if (c2 <= 9)
 810               ipv6rev[62-((4*i)+2)] = c2 + '0';
 811             else
 812               ipv6rev[62-((4*i)+2)] = c2 + 87;
 813           }
 814         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "My network is %s'.\n", ipv6rev);
 815         comparelen = 10 + 4*ipv6prefix;
 816         if(0 == strncmp(pdns->queries[0]->name+(pdns->queries[0]->namelen - comparelen),
 817                         ipv6rev + (74 - comparelen),
 818                         comparelen))
 819           {
 820             GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Reverse-Query for .gnunet!\n");
 821
 822             GNUNET_SCHEDULER_add_now(send_rev_query, pdns);
 823
 824             goto out;
 825           }
 826       }
 827
 828     char* virt_dns;
 829     unsigned int virt_dns_bytes;
 830     if (GNUNET_SYSERR ==
 831         GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "VIRTDNS",
 832                                                &virt_dns))
 833       {
 834         GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 835                     "No entry 'VIRTDNS' in configuration!\n");
 836         exit (1);
 837       }
 838
 839     if (1 != inet_pton (AF_INET, virt_dns, &virt_dns_bytes))
 840       {
 841         GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 842                     "Error parsing 'VIRTDNS': %s; %m!\n", virt_dns);
 843         exit(1);
 844       }
 845
 846     GNUNET_free(virt_dns);
 847
 848     if (virt_dns_bytes == pkt->orig_to)
 849       {
 850         /* This is a packet that was sent directly to the virtual dns-server
 851          *
 852          * This means we have to send this query over gnunet
 853          */
 854
 855         size_t size = sizeof(struct GNUNET_MESH_Tunnel*) + sizeof(struct GNUNET_MessageHeader) + (ntohs(message->size) - sizeof(struct query_packet) + 1);
 856         struct tunnel_cls *cls_ =  GNUNET_malloc(size);
 857         cls_->hdr.size = size - sizeof(struct GNUNET_MESH_Tunnel*);
 858
 859         cls_->hdr.type = ntohs(GNUNET_MESSAGE_TYPE_REMOTE_QUERY_DNS);
 860         GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "size: %d\n", size);
 861
 862         memcpy(&cls_->dns, dns, cls_->hdr.size - sizeof(struct GNUNET_MessageHeader));
 863         GNUNET_SCHEDULER_add_now(send_mesh_query, cls_);
 864
 865         goto outfree;
 866       }
 867
 868
 869     /* The query should be sent to the network */
 870
 871     struct sockaddr_in dest;
 872     memset(&dest, 0, sizeof dest);
 873     dest.sin_port = htons(53);
 874     dest.sin_addr.s_addr = pkt->orig_to;
 875
 876     GNUNET_NETWORK_socket_sendto(dnsout,
 877                                  dns,
 878                                  ntohs(pkt->hdr.size) - sizeof(struct query_packet) + 1,
 879                                  (struct sockaddr*) &dest,
 880                                  sizeof dest);
 881
 882 outfree:
 883     free_parsed_dns_packet(pdns);
 884     pdns = NULL;
 885 out:
 886     GNUNET_SERVER_receive_done(client, GNUNET_OK);
 887 }
 888
 889 static void read_response (void *cls,
 890                            const struct GNUNET_SCHEDULER_TaskContext *tc);
 891
 892 static int
 893 open_port ()
 894 {
 895   struct sockaddr_in addr;
 896
 897   dnsout = GNUNET_NETWORK_socket_create (AF_INET, SOCK_DGRAM, 0);
 898   if (dnsout == NULL)
 899     return GNUNET_SYSERR;
 900   memset (&addr, 0, sizeof (struct sockaddr_in));
 901
 902   addr.sin_family = AF_INET;
 903   int err = GNUNET_NETWORK_socket_bind (dnsout,
 904                                         (struct sockaddr *) &addr,
 905                                         sizeof (struct sockaddr_in));
 906
 907   if (err != GNUNET_OK)
 908     {
 909       GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
 910                   "Could not bind a port: %m\n");
 911       return GNUNET_SYSERR;
 912     }
 913
 914   /* Read the port we bound to */
 915   socklen_t addrlen = sizeof (struct sockaddr_in);
 916   err = getsockname (GNUNET_NETWORK_get_fd (dnsout),
 917                      (struct sockaddr *) &addr, &addrlen);
 918
 919   dnsoutport = htons (addr.sin_port);
 920
 921   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Bound to port %d.\n", dnsoutport);
 922
 923   GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL, dnsout,
 924                                  &read_response, NULL);
 925
 926   return GNUNET_YES;
 927 }
 928
 929 /**
 930  * Read a response-packet of the UDP-Socket
 931  */
 932 static void
 933 read_response (void *cls
 934                __attribute__ ((unused)),
 935                const struct GNUNET_SCHEDULER_TaskContext *tc)
 936 {
 937   struct sockaddr_in addr;
 938   socklen_t addrlen = sizeof (addr);
 939   int r;
 940   int len;
 941
 942   if (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
 943     return;
 944
 945   memset (&addr, 0, sizeof addr);
 946
 947 #ifndef MINGW
 948   if (0 != ioctl (GNUNET_NETWORK_get_fd (dnsout), FIONREAD, &len))
 949     {
 950       unhijack (dnsoutport);
 951       if (GNUNET_YES == open_port ())
 952         GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS, hijack, NULL);
 953       return;
 954     }
 955 #else
 956   /* port the code above? */
 957   len = 65536;
 958 #endif
 959   {
 960     unsigned char buf[len];
 961     struct dns_pkt *dns = (struct dns_pkt *) buf;
 962
 963     r = GNUNET_NETWORK_socket_recvfrom (dnsout,
 964                                         buf,
 965                                         sizeof (buf),
 966                                         (struct sockaddr *) &addr, &addrlen);
 967
 968     if (r < 0)
 969       {
 970         unhijack (dnsoutport);
 971         if (GNUNET_YES == open_port ())
 972           GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS, hijack, NULL);
 973         return;
 974       }
 975
 976     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Answer to query %d\n", ntohs(dns->s.id));
 977
 978     if (query_states[dns->s.id].valid == GNUNET_YES)
 979       {
 980         if (query_states[dns->s.id].tunnel != NULL)
 981           {
 982             GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Answer to query %d for a remote peer!\n", ntohs(dns->s.id));
 983             /* This response should go through a tunnel */
 984             uint32_t *c = GNUNET_malloc (4 + sizeof(struct GNUNET_MESH_Tunnel*) + r);
 985             *c = r;
 986             struct GNUNET_MESH_Tunnel** t = (struct GNUNET_MESH_Tunnel**)(c + 1);
 987             *t = query_states[dns->s.id].tunnel;
 988             memcpy (t + 1, dns, r);
 989             if (NULL ==
 990                 GNUNET_MESH_tunnel_get_data (query_states[dns->s.id].tunnel))
 991               {
 992                 struct GNUNET_MESH_TransmitHandle *th =
 993                   GNUNET_MESH_notify_transmit_ready (query_states[dns->s.id].tunnel,
 994                                                      GNUNET_YES,
 995                                                      32,
 996                                                      GNUNET_TIME_UNIT_MINUTES,
 997                                                      NULL,
 998                                                      r +
 999                                                      sizeof (struct
1000                                                              GNUNET_MessageHeader),
1001                                                      mesh_send_response, c);
1002                 GNUNET_MESH_tunnel_set_data (query_states[dns->s.id].tunnel,
1003                                              th);
1004               }
1005             else
1006               {
1007                 struct tunnel_notify_queue* head = GNUNET_MESH_tunnel_get_head(query_states[dns->s.id].tunnel);
1008                 struct tunnel_notify_queue* tail = GNUNET_MESH_tunnel_get_tail(query_states[dns->s.id].tunnel);
1009
1010                 struct tunnel_notify_queue* element = GNUNET_malloc(sizeof(struct tunnel_notify_queue));
1011                 element->cls = c;
1012                 element->len = r+sizeof(struct GNUNET_MessageHeader);
1013                 element->cb = mesh_send_response;
1014
1015                 GNUNET_CONTAINER_DLL_insert_tail(head, tail, element);
1016                 GNUNET_MESH_tunnel_set_head(query_states[dns->s.id].tunnel, head);
1017                 GNUNET_MESH_tunnel_set_tail(query_states[dns->s.id].tunnel, tail);
1018               }
1019           }
1020         else
1021           {
1022             query_states[dns->s.id].valid = GNUNET_NO;
1023
1024             size_t len = sizeof (struct answer_packet) + r - 1; /* 1 for the unsigned char data[1]; */
1025             struct answer_packet_list *answer =
1026               GNUNET_malloc (len + 2 * sizeof (struct answer_packet_list *));
1027             answer->pkt.hdr.type =
1028               htons (GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
1029             answer->pkt.hdr.size = htons (len);
1030             answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_IP;
1031             answer->pkt.from = addr.sin_addr.s_addr;
1032             answer->pkt.to = query_states[dns->s.id].local_ip;
1033             answer->pkt.dst_port = query_states[dns->s.id].local_port;
1034             memcpy (answer->pkt.data, buf, r);
1035
1036             GNUNET_CONTAINER_DLL_insert_after (head, tail, tail, answer);
1037
1038             GNUNET_SERVER_notify_transmit_ready (query_states
1039                                                  [dns->s.id].client, len,
1040                                                  GNUNET_TIME_UNIT_FOREVER_REL,
1041                                                  &send_answer,
1042                                                  query_states[dns->s.
1043                                                               id].client);
1044           }
1045       }
1046   }
1047   GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
1048                                  dnsout, &read_response, NULL);
1049 }
1050
1051
1052 /**
1053  * Task run during shutdown.
1054  *
1055  * @param cls unused
1056  * @param tc unused
1057  */
1058 static void
1059 cleanup_task (void *cls __attribute__((unused)),
1060               const struct GNUNET_SCHEDULER_TaskContext *tc)
1061 {
1062   GNUNET_assert(0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN));
1063
1064   unhijack(dnsoutport);
1065   GNUNET_DHT_disconnect(dht);
1066   GNUNET_MESH_disconnect(mesh_handle);
1067 }
1068
1069 /**
1070  * @brief Create a port-map from udp and tcp redirects
1071  *
1072  * @param udp_redirects
1073  * @param tcp_redirects
1074  *
1075  * @return
1076  */
1077 uint64_t
1078 get_port_from_redirects (const char *udp_redirects, const char *tcp_redirects)
1079 {
1080   uint64_t ret = 0;
1081   char* cpy, *hostname, *redirect;
1082   int local_port, count = 0;
1083
1084   if (NULL != udp_redirects)
1085     {
1086       cpy = GNUNET_strdup (udp_redirects);
1087       for (redirect = strtok (cpy, " "); redirect != NULL; redirect = strtok (NULL, " "))
1088         {
1089           if (NULL == (hostname = strstr (redirect, ":")))
1090             {
1091               GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: option %s is not formatted correctly!\n", redirect);
1092               continue;
1093             }
1094           hostname[0] = '\0';
1095           local_port = atoi (redirect);
1096           if (!((local_port > 0) && (local_port < 65536)))
1097             GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: %s is not a correct port.", redirect);
1098
1099           ret |= (0xFFFF & htons(local_port));
1100           ret <<= 16;
1101           count ++;
1102
1103           if(count > 4)
1104             {
1105               ret = 0;
1106               goto out;
1107             }
1108         }
1109       GNUNET_free(cpy);
1110       cpy = NULL;
1111     }
1112
1113   if (NULL != tcp_redirects)
1114     {
1115       cpy = GNUNET_strdup (tcp_redirects);
1116       for (redirect = strtok (cpy, " "); redirect != NULL; redirect = strtok (NULL, " "))
1117         {
1118           if (NULL == (hostname = strstr (redirect, ":")))
1119             {
1120               GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: option %s is not formatted correctly!\n", redirect);
1121               continue;
1122             }
1123           hostname[0] = '\0';
1124           local_port = atoi (redirect);
1125           if (!((local_port > 0) && (local_port < 65536)))
1126             GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Warning: %s is not a correct port.", redirect);
1127
1128           ret |= (0xFFFF & htons(local_port));
1129           ret <<= 16;
1130           count ++;
1131
1132           if(count > 4)
1133             {
1134               ret = 0;
1135               goto out;
1136             }
1137         }
1138       GNUNET_free(cpy);
1139       cpy = NULL;
1140     }
1141
1142 out:
1143   if (NULL != cpy)
1144     GNUNET_free(cpy);
1145   return ret;
1146 }
1147
1148 void
1149 publish_name (const char *name, uint64_t ports, uint32_t service_type,
1150               struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key)
1151 {
1152   size_t size = sizeof (struct GNUNET_DNS_Record);
1153   struct GNUNET_DNS_Record data;
1154   memset (&data, 0, size);
1155
1156   data.purpose.size =
1157     htonl (size - sizeof (struct GNUNET_CRYPTO_RsaSignature));
1158   data.purpose.purpose = GNUNET_SIGNATURE_PURPOSE_DNS_RECORD;
1159
1160   GNUNET_CRYPTO_hash (name, strlen (name) + 1, &data.service_descriptor);
1161   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Store with key1 %x\n",
1162               *((unsigned long long *) &data.service_descriptor));
1163
1164   data.service_type = service_type;
1165   data.ports = ports;
1166
1167   GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &data.peer);
1168
1169   data.expiration_time =
1170     GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_HOURS, 2));
1171
1172   /* Sign the block */
1173   if (GNUNET_OK != GNUNET_CRYPTO_rsa_sign (my_private_key,
1174                                            &data.purpose, &data.signature))
1175     {
1176       GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "could not sign DNS_Record\n");
1177       return;
1178     }
1179
1180   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1181               "Putting with key %08x, size = %d\n",
1182               *((unsigned int *) &data.service_descriptor), size);
1183
1184   GNUNET_DHT_put (dht,
1185                   &data.service_descriptor,
1186                   DEFAULT_PUT_REPLICATION,
1187                   GNUNET_DHT_RO_NONE,
1188                   GNUNET_BLOCK_TYPE_DNS,
1189                   size,
1190                   (char *) &data,
1191                   GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_HOURS),
1192                   GNUNET_TIME_UNIT_MINUTES, NULL, NULL);
1193 }
1194
1195 /**
1196  * @brief Publishes the record defined by the section section
1197  *
1198  * @param cls closure
1199  * @param section the current section
1200  */
1201 void
1202 publish_iterate (void *cls __attribute__((unused)), const char *section)
1203 {
1204   if ((strlen(section) < 8) || (0 != strcmp (".gnunet.", section + (strlen(section) - 8))))
1205     return;
1206
1207   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Parsing dns-name %s\n", section);
1208
1209   char *udp_redirects, *tcp_redirects, *alternative_names, *alternative_name,
1210     *keyfile;
1211
1212   GNUNET_CONFIGURATION_get_value_string (cfg, section,
1213                                          "UDP_REDIRECTS", &udp_redirects);
1214   GNUNET_CONFIGURATION_get_value_string (cfg, section, "TCP_REDIRECTS",
1215                                          &tcp_redirects);
1216
1217   if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (cfg, "GNUNETD",
1218                                                             "HOSTKEY",
1219                                                             &keyfile))
1220     {
1221       GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "could not read keyfile-value\n");
1222       if (keyfile != NULL)
1223         GNUNET_free (keyfile);
1224       return;
1225     }
1226
1227   struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key =
1228     GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
1229   GNUNET_free (keyfile);
1230   GNUNET_assert (my_private_key != NULL);
1231
1232   uint64_t ports = get_port_from_redirects (udp_redirects, tcp_redirects);
1233   uint32_t service_type = 0;
1234
1235   if (NULL != udp_redirects)
1236     service_type = GNUNET_DNS_SERVICE_TYPE_UDP;
1237
1238   if (NULL != tcp_redirects)
1239     service_type |= GNUNET_DNS_SERVICE_TYPE_TCP;
1240
1241   service_type = htonl (service_type);
1242
1243
1244   publish_name (section, ports, service_type, my_private_key);
1245
1246   GNUNET_CONFIGURATION_get_value_string (cfg, section,
1247                                          "ALTERNATIVE_NAMES",
1248                                          &alternative_names);
1249   for (alternative_name = strtok (alternative_names, " ");
1250        alternative_name != NULL; alternative_name = strtok (NULL, " "))
1251     {
1252       char *altname =
1253         alloca (strlen (alternative_name) + strlen (section) + 1 + 1);
1254       strcpy (altname, alternative_name);
1255       strcpy (altname + strlen (alternative_name) + 1, section);
1256       altname[strlen (alternative_name)] = '.';
1257
1258       publish_name (altname, ports, service_type, my_private_key);
1259     }
1260
1261   GNUNET_free_non_null(alternative_names);
1262   GNUNET_CRYPTO_rsa_key_free (my_private_key);
1263   GNUNET_free_non_null (udp_redirects);
1264   GNUNET_free_non_null (tcp_redirects);
1265 }
1266
1267 /**
1268  * Publish a DNS-record in the DHT.
1269  */
1270 static void
1271 publish_names (void *cls __attribute__((unused)),
1272                const struct GNUNET_SCHEDULER_TaskContext *tc) {
1273     if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1274       return;
1275
1276     GNUNET_CONFIGURATION_iterate_sections(cfg, publish_iterate, NULL);
1277
1278     GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_HOURS,
1279                                   publish_names,
1280                                   NULL);
1281 }
1282
1283 /**
1284  * @param cls closure
1285  * @param server the initialized server
1286  * @param cfg_ configuration to use
1287  */
1288 static void
1289 run (void *cls,
1290      struct GNUNET_SERVER_Handle *server,
1291      const struct GNUNET_CONFIGURATION_Handle *cfg_)
1292 {
1293   static const struct GNUNET_SERVER_MessageHandler handlers[] = {
1294     /* callback, cls, type, size */
1295     {&receive_query, NULL, GNUNET_MESSAGE_TYPE_LOCAL_QUERY_DNS, 0},
1296     {&rehijack, NULL, GNUNET_MESSAGE_TYPE_REHIJACK,
1297      sizeof (struct GNUNET_MessageHeader)},
1298     {NULL, NULL, 0, 0}
1299   };
1300
1301   static const struct GNUNET_MESH_MessageHandler mesh_handlers[] = {
1302     {receive_mesh_query, GNUNET_MESSAGE_TYPE_REMOTE_QUERY_DNS, 0},
1303     {receive_mesh_answer, GNUNET_MESSAGE_TYPE_REMOTE_ANSWER_DNS, 0},
1304     {NULL, 0, 0}
1305   };
1306
1307   static GNUNET_MESH_ApplicationType *apptypes;
1308
1309   if (GNUNET_YES != open_port ())
1310     {
1311       GNUNET_SCHEDULER_shutdown();
1312       return;
1313     }
1314
1315   if (GNUNET_YES ==
1316       GNUNET_CONFIGURATION_get_value_yesno (cfg_, "dns", "PROVIDE_EXIT"))
1317     apptypes = (GNUNET_MESH_ApplicationType[])
1318     {
1319     GNUNET_APPLICATION_TYPE_INTERNET_RESOLVER,
1320     GNUNET_APPLICATION_TYPE_END};
1321   else
1322   apptypes = (GNUNET_MESH_ApplicationType[])
1323   {
1324   GNUNET_APPLICATION_TYPE_END};
1325
1326   mesh_handle =
1327     GNUNET_MESH_connect (cfg_, NULL, NULL, mesh_handlers, apptypes);
1328
1329   cfg = cfg_;
1330
1331   unsigned int i;
1332   for (i = 0; i < 65536; i++)
1333     {
1334       query_states[i].valid = GNUNET_NO;
1335     }
1336
1337   dht = GNUNET_DHT_connect (cfg, 1024);
1338
1339   GNUNET_SCHEDULER_add_now (publish_names, NULL);
1340
1341   GNUNET_SERVER_add_handlers (server, handlers);
1342   GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
1343                                 &cleanup_task, cls);
1344 }
1345
1346 /**
1347  * The main function for the dns service.
1348  *
1349  * @param argc number of arguments from the command line
1350  * @param argv command line arguments
1351  * @return 0 ok, 1 on error
1352  */
1353 int
1354 main (int argc, char *const *argv)
1355 {
1356   return (GNUNET_OK ==
1357           GNUNET_SERVICE_run (argc,
1358                               argv,
1359                               "dns",
1360                               GNUNET_SERVICE_OPTION_NONE,
1361                               &run, NULL)) ? 0 : 1;
1362 }