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