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