src/vpn/gnunet-daemon-vpn.c

   1 /*
   2      This file is part of GNUnet.
   3      (C) 2010 Christian Grothoff
   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-daemon-vpn.c
  23  * @brief
  24  * @author Philipp Toelke
  25  */
  26 #include "platform.h"
  27 #include "gnunet_getopt_lib.h"
  28 #include "gnunet_program_lib.h"
  29 #include "gnunet_os_lib.h"
  30 #include "gnunet-vpn-helper-p.h"
  31 #include "gnunet-vpn-packet.h"
  32 #include "gnunet-vpn-pretty-print.h"
  33 #include "gnunet_common.h"
  34 #include "gnunet_protocols.h"
  35 #include "gnunet_server_lib.h"
  36 #include "gnunet-service-dns-p.h"
  37 #include "gnunet_core_service.h"
  38 #include "gnunet_client_lib.h"
  39 #include "gnunet_container_lib.h"
  40 #include "block_dns.h"
  41 #include "gnunet_constants.h"
  42
  43 /**
  44  * Final status code.
  45  */
  46 static int ret;
  47
  48 /**
  49  * The configuration to use
  50  */
  51 static const struct GNUNET_CONFIGURATION_Handle *cfg;
  52
  53 /**
  54  * PipeHandle to receive data from the helper
  55  */
  56 static struct GNUNET_DISK_PipeHandle* helper_in;
  57
  58 /**
  59  * PipeHandle to send data to the helper
  60  */
  61 static struct GNUNET_DISK_PipeHandle* helper_out;
  62
  63 /**
  64  * FileHandle to receive data from the helper
  65  */
  66 static const struct GNUNET_DISK_FileHandle* fh_from_helper;
  67
  68 /**
  69  * FileHandle to send data to the helper
  70  */
  71 static const struct GNUNET_DISK_FileHandle* fh_to_helper;
  72
  73 /**
  74  * The Message-Tokenizer that tokenizes the messages comming from the helper
  75  */
  76 static struct GNUNET_SERVER_MessageStreamTokenizer* mst;
  77
  78 /**
  79  * The connection to the service-dns
  80  */
  81 static struct GNUNET_CLIENT_Connection *dns_connection;
  82
  83 /**
  84  * A flag to show that the service-dns has to rehijack the outbound dns-packets
  85  *
  86  * This gets set when the helper restarts as the routing-tables are flushed when
  87  * the interface vanishes.
  88  */
  89 static unsigned char restart_hijack;
  90
  91 /**
  92  * The process id of the helper
  93  */
  94 static struct GNUNET_OS_Process *helper_proc;
  95
  96 /**
  97  * a list of outgoing dns-query-packets
  98  */
  99 static struct query_packet_list *head;
 100
 101 /**
 102  * The last element of the list of outgoing dns-query-packets
 103  */
 104 static struct query_packet_list *tail;
 105
 106 /**
 107  * A list of processed dns-responses.
 108  *
 109  * "processed" means that the packet is complete and can be sent out via udp
 110  * directly
 111  */
 112 static struct answer_packet_list *answer_proc_head;
 113
 114 /**
 115  * The last element of the list of processed dns-responses.
 116  */
 117 static struct answer_packet_list *answer_proc_tail;
 118
 119 /**
 120  * The hashmap containing the mappings from ipv6-addresses to gnunet-descriptors
 121  */
 122 static struct GNUNET_CONTAINER_MultiHashMap* hashmap;
 123
 124 /**
 125  * This hashmap contains the mapping from peer, service-descriptor,
 126  * source-port and destination-port to a socket
 127  */
 128 static struct GNUNET_CONTAINER_MultiHashMap *udp_connections;
 129
 130 /**
 131  * The handle to core
 132  */
 133 static struct GNUNET_CORE_Handle *core_handle;
 134
 135 struct map_entry {
 136     struct GNUNET_vpn_service_descriptor desc;
 137     uint16_t namelen;
 138     uint64_t additional_ports;
 139     /**
 140      * In DNS-Format!
 141      */
 142     char name[1];
 143 };
 144
 145 static void helper_read(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tsdkctx);
 146 static void dns_answer_handler(void* cls, const struct GNUNET_MessageHeader *msg);
 147
 148 /**
 149  * Callback called by notify_transmit_ready; sends dns-queries or rehijack-messages
 150  * to the service-dns
 151  * {{{
 152  */
 153 static size_t
 154 send_query(void* cls, size_t size, void* buf) {
 155     size_t len;
 156     /*
 157      * Send the rehijack-message
 158      */
 159     if (restart_hijack == 1)
 160       {
 161         restart_hijack = 0;
 162         /*
 163          * The message is just a header
 164          */
 165         GNUNET_assert(sizeof(struct GNUNET_MessageHeader) <= size);
 166         struct GNUNET_MessageHeader* hdr = buf;
 167         len = sizeof(struct GNUNET_MessageHeader);
 168         hdr->size = htons(len);
 169         hdr->type = htons(GNUNET_MESSAGE_TYPE_REHIJACK);
 170       }
 171     else
 172       {
 173         struct query_packet_list* query = head;
 174         len = ntohs(query->pkt.hdr.size);
 175
 176         GNUNET_assert(len <= size);
 177
 178         memcpy(buf, &query->pkt.hdr, len);
 179
 180         GNUNET_CONTAINER_DLL_remove (head, tail, query);
 181
 182         GNUNET_free(query);
 183       }
 184
 185     /*
 186      * Check whether more data is to be sent
 187      */
 188     if (head != NULL)
 189       {
 190         GNUNET_CLIENT_notify_transmit_ready(dns_connection, ntohs(head->pkt.hdr.size), GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_YES, &send_query, NULL);
 191       }
 192     else if (restart_hijack == 1)
 193       {
 194         GNUNET_CLIENT_notify_transmit_ready(dns_connection, sizeof(struct GNUNET_MessageHeader), GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_YES, &send_query, NULL);
 195       }
 196
 197     return len;
 198 }
 199 /* }}} */
 200
 201 /**
 202  * Function scheduled as very last function, cleans up after us
 203  *{{{
 204  */
 205 static void
 206 cleanup(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tskctx) {
 207     GNUNET_assert (0 != (tskctx->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN));
 208
 209     /* stop the helper */
 210     if (helper_proc != NULL)
 211       {
 212         GNUNET_OS_process_kill (helper_proc, SIGTERM);
 213         GNUNET_OS_process_wait (helper_proc);
 214         GNUNET_OS_process_close (helper_proc);
 215         helper_proc = NULL;
 216       }
 217
 218     /* close the connection to the service-dns */
 219     if (dns_connection != NULL)
 220       {
 221         GNUNET_CLIENT_disconnect (dns_connection, GNUNET_NO);
 222         dns_connection = NULL;
 223       }
 224
 225     if (core_handle != NULL)
 226       {
 227         GNUNET_CORE_disconnect(core_handle);
 228         core_handle = NULL;
 229       }
 230 }
 231 /*}}}*/
 232
 233 /**
 234  * Start the helper-process
 235  * {{{
 236  */
 237 static void
 238 start_helper_and_schedule(void *cls,
 239                           const struct GNUNET_SCHEDULER_TaskContext *tc) {
 240     if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
 241       return;
 242
 243     helper_in = GNUNET_DISK_pipe (GNUNET_YES, GNUNET_YES, GNUNET_NO);
 244     helper_out = GNUNET_DISK_pipe (GNUNET_YES, GNUNET_NO, GNUNET_YES);
 245
 246     if (helper_in == NULL || helper_out == NULL) return;
 247
 248     helper_proc = GNUNET_OS_start_process(helper_in, helper_out, "gnunet-helper-vpn", "gnunet-helper-vpn", NULL);
 249
 250     fh_from_helper = GNUNET_DISK_pipe_handle (helper_out, GNUNET_DISK_PIPE_END_READ);
 251     fh_to_helper = GNUNET_DISK_pipe_handle (helper_in, GNUNET_DISK_PIPE_END_WRITE);
 252
 253     GNUNET_DISK_pipe_close_end(helper_out, GNUNET_DISK_PIPE_END_WRITE);
 254     GNUNET_DISK_pipe_close_end(helper_in, GNUNET_DISK_PIPE_END_READ);
 255
 256     /* Tell the dns-service to rehijack the dns-port
 257      * The routing-table gets flushed if an interface disappears.
 258      */
 259     restart_hijack = 1;
 260     GNUNET_CLIENT_notify_transmit_ready(dns_connection, sizeof(struct GNUNET_MessageHeader), GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_YES, &send_query, NULL);
 261
 262     GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL, fh_from_helper, &helper_read, NULL);
 263 }
 264 /*}}}*/
 265
 266 /**
 267  * Restart the helper-process
 268  * {{{
 269  */
 270 static void
 271 restart_helper(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tskctx) {
 272     // Kill the helper
 273     GNUNET_OS_process_kill (helper_proc, SIGKILL);
 274     GNUNET_OS_process_wait (helper_proc);
 275     GNUNET_OS_process_close (helper_proc);
 276     helper_proc = NULL;
 277
 278     GNUNET_DISK_pipe_close(helper_in);
 279     GNUNET_DISK_pipe_close(helper_out);
 280
 281     /* Restart the helper */
 282     GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS, start_helper_and_schedule, NULL);
 283 }
 284 /*}}}*/
 285
 286 /**
 287  * Read from the helper-process
 288  * {{{
 289  */
 290 static void
 291 helper_read(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tsdkctx) {
 292     /* no message can be bigger then 64k */
 293     char buf[65535];
 294
 295     if (tsdkctx->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
 296       return;
 297
 298     int t = GNUNET_DISK_file_read(fh_from_helper, &buf, 65535);
 299
 300     /* On read-error, restart the helper */
 301     if (t<=0) {
 302         GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Read error for header from vpn-helper: %m\n");
 303         GNUNET_SCHEDULER_add_now(restart_helper, cls);
 304         return;
 305     }
 306
 307     /* FIXME */ GNUNET_SERVER_mst_receive(mst, NULL, buf, t, 0, 0);
 308
 309     GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL, fh_from_helper, &helper_read, NULL);
 310 }
 311 /*}}}*/
 312
 313 static uint32_t calculate_checksum_update(uint32_t sum, uint16_t *hdr, short len) {
 314     for(; len >= 2; len -= 2)
 315       sum += *(hdr++);
 316     if (len == 1)
 317       sum += *((unsigned char*)hdr);
 318     return sum;
 319 }
 320
 321 static uint16_t calculate_checksum_end(uint32_t sum) {
 322     while (sum >> 16)
 323       sum = (sum >> 16) + (sum & 0xFFFF);
 324
 325     return ~sum;
 326 }
 327
 328 /**
 329  * Calculate the checksum of an IPv4-Header
 330  */
 331 static uint16_t
 332 calculate_ip_checksum(uint16_t* hdr, short len) {
 333     uint32_t sum = calculate_checksum_update(0, hdr, len);
 334     return calculate_checksum_end(sum);
 335 }
 336
 337 /**
 338  * Send an dns-answer-packet to the helper
 339  */
 340 static void
 341 helper_write(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tsdkctx) {
 342     if (tsdkctx->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
 343       return;
 344
 345     struct answer_packet_list* ans = answer_proc_head;
 346     size_t len = ntohs(ans->pkt.hdr.size);
 347
 348     GNUNET_assert(ans->pkt.subtype == GNUNET_DNS_ANSWER_TYPE_IP);
 349
 350     GNUNET_assert (20 == sizeof (struct ip_hdr));
 351     GNUNET_assert (8 == sizeof (struct udp_pkt));
 352     size_t data_len = len - sizeof(struct answer_packet) + 1;
 353     size_t net_len = sizeof(struct ip_hdr) + sizeof(struct udp_dns) + data_len;
 354     size_t pkt_len = sizeof(struct GNUNET_MessageHeader) + sizeof(struct pkt_tun) + net_len;
 355
 356     struct ip_udp_dns* pkt = alloca(pkt_len);
 357     memset(pkt, 0, pkt_len);
 358
 359     /* set the gnunet-header */
 360     pkt->shdr.size = htons(pkt_len);
 361     pkt->shdr.type = htons(GNUNET_MESSAGE_TYPE_VPN_HELPER);
 362
 363     /* set the tun-header (no flags and ethertype of IPv4) */
 364     pkt->tun.flags = 0;
 365     pkt->tun.type = htons(0x0800);
 366
 367     /* set the ip-header */
 368     pkt->ip_hdr.version = 4;
 369     pkt->ip_hdr.hdr_lngth = 5;
 370     pkt->ip_hdr.diff_serv = 0;
 371     pkt->ip_hdr.tot_lngth = htons(net_len);
 372     pkt->ip_hdr.ident = 0;
 373     pkt->ip_hdr.flags = 0;
 374     pkt->ip_hdr.frag_off = 0;
 375     pkt->ip_hdr.ttl = 255;
 376     pkt->ip_hdr.proto = 0x11; /* UDP */
 377     pkt->ip_hdr.chks = 0; /* Will be calculated later*/
 378     pkt->ip_hdr.sadr = ans->pkt.from;
 379     pkt->ip_hdr.dadr = ans->pkt.to;
 380
 381     pkt->ip_hdr.chks = calculate_ip_checksum((uint16_t*)&pkt->ip_hdr, 5*4);
 382
 383     /* set the udp-header */
 384     pkt->udp_dns.udp_hdr.spt = htons(53);
 385     pkt->udp_dns.udp_hdr.dpt = ans->pkt.dst_port;
 386     pkt->udp_dns.udp_hdr.len = htons(net_len - sizeof(struct ip_hdr));
 387     pkt->udp_dns.udp_hdr.crc = 0; /* Optional for IPv4 */
 388
 389     memcpy(&pkt->udp_dns.data, ans->pkt.data, data_len);
 390
 391     GNUNET_CONTAINER_DLL_remove (answer_proc_head, answer_proc_tail, ans);
 392     GNUNET_free(ans);
 393
 394     /* FIXME */ GNUNET_DISK_file_write(fh_to_helper, pkt, pkt_len);
 395
 396     /* if more packets are available, reschedule */
 397     if (answer_proc_head != NULL)
 398       GNUNET_SCHEDULER_add_write_file (GNUNET_TIME_UNIT_FOREVER_REL,
 399                                        fh_to_helper,
 400                                        &helper_write,
 401                                        NULL);
 402 }
 403
 404 /**
 405  * @return the hash of the IP-Address if a mapping exists, NULL otherwise
 406  */
 407 static GNUNET_HashCode*
 408 address_mapping_exists(unsigned char addr[]) {
 409     GNUNET_HashCode* key = GNUNET_malloc(sizeof(GNUNET_HashCode));
 410     unsigned char* k = (unsigned char*)key;
 411     memset(key, 0, sizeof(GNUNET_HashCode));
 412     unsigned int i;
 413     for (i = 0; i < 16; i++)
 414         k[15-i] = addr[i];
 415
 416     if (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains(hashmap, key))
 417       return key;
 418     else
 419       {
 420         GNUNET_free(key);
 421         return NULL;
 422       }
 423 }
 424
 425 static void
 426 send_icmp_response(void* cls, const struct GNUNET_SCHEDULER_TaskContext *tc) {
 427     struct ip6_icmp* request = cls;
 428
 429     struct ip6_icmp* response = alloca(ntohs(request->shdr.size));
 430     memset(response, 0, ntohs(request->shdr.size));
 431
 432     response->shdr.size = request->shdr.size;
 433     response->shdr.type = htons(GNUNET_MESSAGE_TYPE_VPN_HELPER);
 434
 435     response->tun.flags = 0;
 436     response->tun.type = htons(0x86dd);
 437
 438     response->ip6_hdr.hoplmt = 255;
 439     response->ip6_hdr.paylgth = request->ip6_hdr.paylgth;
 440     response->ip6_hdr.nxthdr = 0x3a;
 441     response->ip6_hdr.version = 6;
 442     memcpy(&response->ip6_hdr.sadr, &request->ip6_hdr.dadr, 16);
 443     memcpy(&response->ip6_hdr.dadr, &request->ip6_hdr.sadr, 16);
 444
 445     response->icmp_hdr.code = 0;
 446     response->icmp_hdr.type = 0x81;
 447
 448     /* Magic, more Magic! */
 449     response->icmp_hdr.chks = request->icmp_hdr.chks - 0x1;
 450
 451     /* Copy the rest of the packet */
 452     memcpy(response+1, request+1, ntohs(request->shdr.size) - sizeof(struct ip6_icmp));
 453
 454     /* FIXME */ GNUNET_DISK_file_write(fh_to_helper, response, ntohs(response->shdr.size));
 455
 456     GNUNET_free(request);
 457 }
 458
 459 /**
 460  * cls is the pointer to a GNUNET_MessageHeader that is
 461  * followed by the service-descriptor and the udp-packet that should be sent;
 462  */
 463 static size_t
 464 handle_udp (void *cls, size_t size, void *buf)
 465 {
 466   struct GNUNET_PeerIdentity *peer = cls;
 467   struct GNUNET_MessageHeader *hdr =
 468     (struct GNUNET_MessageHeader *) (peer + 1);
 469   GNUNET_HashCode *hc = (GNUNET_HashCode *) (hdr + 1);
 470   struct udp_pkt *udp = (struct udp_pkt *) (hc + 1);
 471   hdr->size = htons (sizeof (struct GNUNET_MessageHeader) +
 472                      sizeof (GNUNET_HashCode) + ntohs (udp->len));
 473   hdr->type = ntohs (GNUNET_MESSAGE_TYPE_SERVICE_UDP);
 474   GNUNET_assert (size >= ntohs (hdr->size));
 475   memcpy (buf, hdr, ntohs (hdr->size));
 476   size = ntohs(hdr->size);
 477   GNUNET_free (cls);
 478   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sent!\n");
 479   return size;
 480 }
 481
 482 static unsigned int
 483 port_in_ports (uint64_t ports, uint16_t port)
 484 {
 485   uint16_t *ps = (uint16_t *) & ports;
 486   return ps[0] == port || ps[1] == port || ps[2] == port || ps[3] == port;
 487 }
 488
 489 void
 490 send_udp (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
 491 {
 492   struct GNUNET_PeerIdentity *peer = cls;
 493   struct GNUNET_MessageHeader *hdr =
 494     (struct GNUNET_MessageHeader *) (peer + 1);
 495   GNUNET_HashCode *hc = (GNUNET_HashCode *) (hdr + 1);
 496   struct udp_pkt *udp = (struct udp_pkt *) (hc + 1);
 497   GNUNET_CORE_notify_transmit_ready (core_handle,
 498                                      42,
 499                                      GNUNET_TIME_relative_divide(GNUNET_CONSTANTS_MAX_CORK_DELAY, 2),
 500                                      peer,
 501                                      htons (sizeof
 502                                             (struct GNUNET_MessageHeader) +
 503                                             sizeof (GNUNET_HashCode) +
 504                                             ntohs (udp->len)), handle_udp,
 505                                      cls);
 506 }
 507
 508 /**
 509  * Receive packets from the helper-process
 510  */
 511 static void
 512 message_token(void *cls,
 513               void *client,
 514               const struct GNUNET_MessageHeader *message) {
 515     GNUNET_assert(ntohs(message->type) == GNUNET_MESSAGE_TYPE_VPN_HELPER);
 516
 517     struct tun_pkt *pkt_tun = (struct tun_pkt*) message;
 518
 519     /* ethertype is ipv6 */
 520     if (ntohs(pkt_tun->tun.type) == 0x86dd)
 521       {
 522         struct ip6_pkt *pkt6 = (struct ip6_pkt*) message;
 523         GNUNET_assert(pkt6->ip6_hdr.version == 6);
 524         struct ip6_tcp *pkt6_tcp;
 525         struct ip6_udp *pkt6_udp;
 526         struct ip6_icmp *pkt6_icmp;
 527         GNUNET_HashCode* key;
 528
 529         switch(pkt6->ip6_hdr.nxthdr)
 530           {
 531           case 0x06:
 532             pkt6_tcp = (struct ip6_tcp*)pkt6;
 533             pkt_printf_ip6tcp(pkt6_tcp);
 534             break;
 535           case 0x11:
 536             pkt6_udp = (struct ip6_udp*)pkt6;
 537             if ((key = address_mapping_exists(pkt6->ip6_hdr.dadr)) != NULL)
 538               {
 539                 struct map_entry* me = GNUNET_CONTAINER_multihashmap_get(hashmap, key);
 540                 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Mapping exists; type: %d; UDP is %d; port: %x/%x!\n", me->desc.service_type, htonl(GNUNET_DNS_SERVICE_TYPE_UDP), pkt6_udp->udp_hdr.dpt, me->desc.ports);
 541                 GNUNET_free(key);
 542                 if (me->desc.service_type & htonl(GNUNET_DNS_SERVICE_TYPE_UDP) &&
 543                     (port_in_ports(me->desc.ports, pkt6_udp->udp_hdr.dpt) ||
 544                      port_in_ports(me->additional_ports, pkt6_udp->udp_hdr.dpt)))
 545                   {
 546                     size_t size = sizeof(struct GNUNET_PeerIdentity) + sizeof(struct GNUNET_MessageHeader) + sizeof(GNUNET_HashCode) + ntohs(pkt6_udp->udp_hdr.len);
 547                     struct GNUNET_PeerIdentity *cls = GNUNET_malloc(size);
 548                     struct GNUNET_MessageHeader *hdr = (struct GNUNET_MessageHeader*)(cls+1);
 549                     GNUNET_HashCode* hc = (GNUNET_HashCode*)(hdr + 1);
 550                     memcpy(cls, &me->desc.peer, sizeof(struct GNUNET_PeerIdentity));
 551                     memcpy(hc, &me->desc.service_descriptor, sizeof(GNUNET_HashCode));
 552                     memcpy(hc+1, &pkt6_udp->udp_hdr, ntohs(pkt6_udp->udp_hdr.len));
 553                     GNUNET_CORE_peer_request_connect(core_handle,
 554                                         GNUNET_TIME_UNIT_FOREVER_REL,
 555                                         (struct GNUNET_PeerIdentity*)&me->desc.peer,
 556                                         send_udp,
 557                                         cls);
 558                     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Queued to send to peer %x\n", *((unsigned int*)&me->desc.peer));
 559                   }
 560               }
 561             break;
 562           case 0x3a:
 563             /* ICMPv6 */
 564             pkt6_icmp = (struct ip6_icmp*)pkt6;
 565             /* If this packet is an icmp-echo-request and a mapping exists, answer */
 566             if (pkt6_icmp->icmp_hdr.type == 0x80 && (key = address_mapping_exists(pkt6->ip6_hdr.dadr)) != NULL)
 567               {
 568                 GNUNET_free(key);
 569                 pkt6_icmp = GNUNET_malloc(ntohs(pkt6->shdr.size));
 570                 memcpy(pkt6_icmp, pkt6, ntohs(pkt6->shdr.size));
 571                 GNUNET_SCHEDULER_add_now(&send_icmp_response, pkt6_icmp);
 572               }
 573             break;
 574           }
 575       }
 576     /* ethertype is ipv4 */
 577     else if (ntohs(pkt_tun->tun.type) == 0x0800)
 578       {
 579         struct ip_pkt *pkt = (struct ip_pkt*) message;
 580         struct ip_udp *udp = (struct ip_udp*) message;
 581         GNUNET_assert(pkt->ip_hdr.version == 4);
 582
 583         /* Send dns-packets to the service-dns */
 584         if (pkt->ip_hdr.proto == 0x11 && ntohs(udp->udp_hdr.dpt) == 53 )
 585           {
 586             /* 9 = 8 for the udp-header + 1 for the unsigned char data[1]; */
 587             size_t len = sizeof(struct query_packet) + ntohs(udp->udp_hdr.len) - 9;
 588
 589             struct query_packet_list* query = GNUNET_malloc(len + 2*sizeof(struct query_packet_list*));
 590             query->pkt.hdr.type = htons(GNUNET_MESSAGE_TYPE_LOCAL_QUERY_DNS);
 591             query->pkt.hdr.size = htons(len);
 592             query->pkt.orig_to = pkt->ip_hdr.dadr;
 593             query->pkt.orig_from = pkt->ip_hdr.sadr;
 594             query->pkt.src_port = udp->udp_hdr.spt;
 595             memcpy(query->pkt.data, udp->data, ntohs(udp->udp_hdr.len) - 8);
 596
 597             GNUNET_CONTAINER_DLL_insert_after(head, tail, tail, query);
 598
 599             if (dns_connection != NULL)
 600               GNUNET_CLIENT_notify_transmit_ready(dns_connection,
 601                                                   len,
 602                                                   GNUNET_TIME_UNIT_FOREVER_REL,
 603                                                   GNUNET_YES,
 604                                                   &send_query,
 605                                                   NULL);
 606           }
 607       }
 608 }
 609
 610 /**
 611  * Connect to the service-dns
 612  */
 613 static void
 614 connect_to_service_dns (void *cls,
 615                         const struct GNUNET_SCHEDULER_TaskContext *tc) {
 616     if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
 617       return;
 618     GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Connecting to service-dns\n");
 619     GNUNET_assert (dns_connection == NULL);
 620     dns_connection = GNUNET_CLIENT_connect ("dns", cfg);
 621     GNUNET_CLIENT_receive(dns_connection, &dns_answer_handler, NULL, GNUNET_TIME_UNIT_FOREVER_REL);
 622
 623     /* If a packet is already in the list, schedule to send it */
 624     if (head != NULL)
 625       GNUNET_CLIENT_notify_transmit_ready(dns_connection,
 626                                           ntohs(head->pkt.hdr.size),
 627                                           GNUNET_TIME_UNIT_FOREVER_REL,
 628                                           GNUNET_YES,
 629                                           &send_query,
 630                                           NULL);
 631     else if (restart_hijack == 1)
 632       {
 633         GNUNET_CLIENT_notify_transmit_ready(dns_connection, sizeof(struct GNUNET_MessageHeader), GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_YES, &send_query, NULL);
 634       }
 635 }
 636
 637 /**
 638  * Create a new Address from an answer-packet
 639  * {{{
 640  */
 641 void
 642 new_ip6addr(char* buf, const GNUNET_HashCode *peer, const GNUNET_HashCode *service_desc) {
 643         memcpy(buf+14, (int[]){htons(0x3412)}, 2);
 644         memcpy(buf+8, service_desc, 6);
 645         memcpy(buf, peer, 8);
 646 }
 647 /*}}}*/
 648
 649 /**
 650  * This gets scheduled with cls pointing to an answer_packet and does everything
 651  * needed in order to send it to the helper.
 652  *
 653  * At the moment this means "inventing" and IPv6-Address for .gnunet-services and
 654  * doing nothing for "real" services.
 655  */
 656 static void
 657 process_answer(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tc) {
 658     struct answer_packet* pkt = cls;
 659     struct answer_packet_list* list;
 660
 661     /* This answer is about a .gnunet-service
 662      *
 663      * It contains an almost complete DNS-Response, we have to fill in the ip
 664      * at the offset pkt->addroffset
 665      */
 666     //FIXME htons?
 667     if (pkt->subtype == GNUNET_DNS_ANSWER_TYPE_SERVICE)
 668       {
 669         pkt->subtype = GNUNET_DNS_ANSWER_TYPE_IP;
 670
 671         GNUNET_HashCode key;
 672         memset(&key, 0, sizeof(GNUNET_HashCode));
 673         new_ip6addr((char*)&key, &pkt->service_descr.peer, &pkt->service_descr.service_descriptor);
 674
 675         uint16_t namelen = strlen((char*)pkt->data+12)+1;
 676
 677         struct map_entry* value = GNUNET_malloc(sizeof(struct GNUNET_vpn_service_descriptor) + 2 + 8 + namelen);
 678
 679         value->namelen = namelen;
 680         memcpy(value->name, pkt->data+12, namelen);
 681
 682         memcpy(&value->desc, &pkt->service_descr, sizeof(struct GNUNET_vpn_service_descriptor));
 683
 684         value->additional_ports = 0;
 685
 686         if (GNUNET_OK != GNUNET_CONTAINER_multihashmap_put(hashmap,
 687                                                            &key,
 688                                                            value,
 689                                                            GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
 690           {
 691             GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Could not store to hashmap\n");
 692           }
 693
 694         /*
 695          * Copy the newly generated backward ip-address to the packet
 696          */
 697         char* c = ((char*)pkt)+ntohs(pkt->addroffset);
 698         char* k = (char*)&key;
 699         unsigned int i;
 700         for (i = 0; i < 16; i++)
 701             c[15-i] = k[i];
 702
 703         list = GNUNET_malloc(htons(pkt->hdr.size) + 2*sizeof(struct answer_packet_list*));
 704
 705         memcpy(&list->pkt, pkt, htons(pkt->hdr.size));
 706
 707       }
 708     else if (pkt->subtype == GNUNET_DNS_ANSWER_TYPE_REV)
 709       {
 710         GNUNET_HashCode key;
 711         memset(&key, 0, sizeof key);
 712         unsigned char* k = (unsigned char*)&key;
 713         unsigned char* s = pkt->data+12;
 714         int i = 0;
 715         /* Whoever designed the reverse IPv6-lookup is batshit insane */
 716         for (i = 0; i < 16; i++)
 717           {
 718             unsigned char c1 = s[(4*i)+1];
 719             unsigned char c2 = s[(4*i)+3];
 720             if (c1 <= '9')
 721               k[i] = c1 - '0';
 722             else
 723               k[i] = c1 - 87; /* 87 is the difference between 'a' and 10 */
 724             if (c2 <= '9')
 725               k[i] += 16*(c2 - '0');
 726             else
 727               k[i] += 16*(c2 - 87);
 728           }
 729
 730         struct map_entry* map_entry = GNUNET_CONTAINER_multihashmap_get(hashmap, &key);
 731         unsigned short offset = ntohs(pkt->addroffset);
 732
 733         if (map_entry == NULL)
 734           {
 735             GNUNET_free(pkt);
 736             return;
 737           }
 738
 739         unsigned short namelen = htons(map_entry->namelen);
 740         char* name = map_entry->name;
 741
 742         list = GNUNET_malloc(2*sizeof(struct answer_packet_list*) + offset + 2 + ntohs(namelen));
 743
 744         struct answer_packet* rpkt = &list->pkt;
 745
 746         memcpy(rpkt, pkt, offset);
 747
 748         rpkt->subtype = GNUNET_DNS_ANSWER_TYPE_IP;
 749         rpkt->hdr.size = ntohs(offset + 2 + ntohs(namelen));
 750
 751         memcpy(((char*)rpkt)+offset, &namelen, 2);
 752         memcpy(((char*)rpkt)+offset+2, name, ntohs(namelen));
 753
 754       }
 755     else if (pkt->subtype == GNUNET_DNS_ANSWER_TYPE_IP)
 756       {
 757         list = GNUNET_malloc(htons(pkt->hdr.size) + 2*sizeof(struct answer_packet_list*));
 758         memcpy(&list->pkt, pkt, htons(pkt->hdr.size));
 759       }
 760     else
 761       {
 762         GNUNET_break(0);
 763         GNUNET_free(pkt);
 764         return;
 765       }
 766
 767     GNUNET_free(pkt);
 768
 769     GNUNET_CONTAINER_DLL_insert_after(answer_proc_head, answer_proc_tail, answer_proc_tail, list);
 770
 771     GNUNET_SCHEDULER_add_write_file (GNUNET_TIME_UNIT_FOREVER_REL, fh_to_helper, &helper_write, NULL);
 772
 773     return;
 774 }
 775
 776 /**
 777  * This receives packets from the service-dns and schedules process_answer to
 778  * handle it
 779  */
 780 static void
 781 dns_answer_handler(void* cls, const struct GNUNET_MessageHeader *msg) {
 782     /* the service disconnected, reconnect after short wait */
 783     if (msg == NULL)
 784       {
 785         GNUNET_CLIENT_disconnect(dns_connection, GNUNET_NO);
 786         dns_connection = NULL;
 787         GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS,
 788                                       &connect_to_service_dns,
 789                                       NULL);
 790         return;
 791       }
 792
 793     /* the service did something strange, reconnect immediately */
 794     if (msg->type != htons(GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS))
 795       {
 796         GNUNET_break (0);
 797         GNUNET_CLIENT_disconnect(dns_connection, GNUNET_NO);
 798         dns_connection = NULL;
 799         GNUNET_SCHEDULER_add_now (&connect_to_service_dns,
 800                                   NULL);
 801         return;
 802       }
 803     void *pkt = GNUNET_malloc(ntohs(msg->size));
 804
 805     memcpy(pkt, msg, ntohs(msg->size));
 806
 807     GNUNET_SCHEDULER_add_now(process_answer, pkt);
 808     GNUNET_CLIENT_receive(dns_connection, &dns_answer_handler, NULL, GNUNET_TIME_UNIT_FOREVER_REL);
 809 }
 810
 811 struct udp_state
 812 {
 813   struct GNUNET_PeerIdentity peer;
 814   GNUNET_HashCode desc;
 815   short spt;
 816   short dpt;
 817 };
 818
 819 struct send_cls
 820 {
 821   struct GNUNET_NETWORK_Handle *sock;
 822   struct udp_state state;
 823 };
 824
 825 static size_t
 826 send_udp_service (void *cls, size_t size, void *buf)
 827 {
 828   struct GNUNET_MessageHeader *hdr = cls;
 829   GNUNET_assert(size >= ntohs(hdr->size));
 830
 831   memcpy(buf, cls, ntohs(hdr->size));
 832   size_t ret = ntohs(hdr->size);
 833   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Sending %d bytes back!\n", ntohs(hdr->size));
 834   GNUNET_free(cls);
 835   return ret;
 836 }
 837
 838 void
 839 receive_from_network (void *cls,
 840                       const struct GNUNET_SCHEDULER_TaskContext *tc)
 841 {
 842   if (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
 843     {
 844       GNUNET_free(cls);
 845       return;
 846     }
 847   struct send_cls *data = cls;
 848
 849   char buf[1400];
 850
 851   struct sockaddr_in addr_in;
 852   socklen_t addr_len = sizeof(struct sockaddr_in);
 853   ssize_t len = GNUNET_NETWORK_socket_recvfrom (data->sock, buf, 1400, (struct sockaddr*)&addr_in, &addr_len);
 854
 855   if (len < 0) {
 856     GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Problem reading from socket: %m\n");
 857     goto out;
 858   }
 859
 860   size_t len_udp = len + sizeof (struct udp_pkt);
 861   size_t len_pkt = len_udp + sizeof (struct GNUNET_MessageHeader) + sizeof(GNUNET_HashCode);
 862   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Sending data back: data: %d; udp: %d, pkt:%d\n", len, len_udp, len_pkt);
 863
 864   struct GNUNET_MessageHeader *hdr = GNUNET_malloc (len_pkt);
 865   GNUNET_HashCode *desc = (GNUNET_HashCode *) (hdr + 1);
 866   struct udp_pkt *pkt = (struct udp_pkt *) (desc + 1);
 867
 868   hdr->size = htons (len_pkt);
 869   hdr->type = htons (GNUNET_MESSAGE_TYPE_SERVICE_UDP_BACK);
 870
 871   pkt->dpt = htons(data->state.spt);
 872   pkt->spt = addr_in.sin_port;
 873   pkt->len = htons (len_udp);
 874   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "UDP from %d to %d\n", ntohs(pkt->spt), ntohs(pkt->dpt));
 875   /* The chksm can only be computed knowing the ip-addresses */
 876
 877   memcpy (desc, &data->state.desc, sizeof (GNUNET_HashCode));
 878   memcpy (pkt + 1, buf, len);
 879
 880   GNUNET_CORE_notify_transmit_ready (core_handle, 42,
 881                                      GNUNET_TIME_relative_divide(GNUNET_CONSTANTS_MAX_CORK_DELAY, 2),
 882                                      &data->state.peer, len_pkt,
 883                                      send_udp_service, hdr);
 884
 885 out:
 886   GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL, data->sock,
 887                                  receive_from_network, cls);
 888 }
 889
 890 void
 891 send_to_network (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
 892 {
 893   if (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
 894     return;
 895   struct send_cls *data = cls;
 896   struct udp_pkt *pkt = (struct udp_pkt *) (data + 1);
 897
 898   struct sockaddr_in a4;
 899   memset(&a4, 0, sizeof(struct sockaddr_in));
 900   a4.sin_family = AF_INET;
 901   a4.sin_port = htons(data->state.dpt);
 902   memcpy(&a4.sin_addr.s_addr, (char[]){127, 0, 0, 1}, 4);
 903
 904   GNUNET_NETWORK_socket_sendto (data->sock, pkt + 1,
 905                                 ntohs (pkt->len) - sizeof (struct udp_pkt),
 906                                 (struct sockaddr*)&a4, sizeof a4);
 907
 908   GNUNET_free(cls);
 909
 910 }
 911
 912 static void
 913 add_additional_port (struct map_entry *me, uint16_t port)
 914 {
 915   uint16_t *ps = (uint16_t *) & me->additional_ports;
 916   unsigned int i;
 917   for (i = 0; i < 4; i++)
 918     {
 919       if (ps[i] == 0)
 920         {
 921           ps[i] = port;
 922           break;
 923         }
 924     }
 925 }
 926
 927 static int
 928 receive_udp_back (void *cls, const struct GNUNET_PeerIdentity *other,
 929              const struct GNUNET_MessageHeader *message,
 930              const struct GNUNET_TRANSPORT_ATS_Information *atsi)
 931 {
 932   GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
 933   struct udp_pkt *pkt = (struct udp_pkt *) (desc + 1);
 934   char addr[16];
 935   new_ip6addr(addr, &other->hashPubKey, desc);
 936
 937   size_t size = sizeof(struct ip6_udp) + ntohs(pkt->len) - 1 - sizeof(struct udp_pkt);
 938
 939   struct ip6_udp* pkt6 = alloca(size);
 940
 941   GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Relaying calc:%d gnu:%d udp:%d bytes!\n", size, ntohs(message->size), ntohs(pkt->len));
 942
 943   pkt6->shdr.type = htons(GNUNET_MESSAGE_TYPE_VPN_HELPER);
 944   pkt6->shdr.size = htons(size);
 945
 946   pkt6->tun.flags = 0;
 947   pkt6->tun.type = htons(0x86dd);
 948
 949   pkt6->ip6_hdr.version = 6;
 950   pkt6->ip6_hdr.tclass_h = 0;
 951   pkt6->ip6_hdr.tclass_l = 0;
 952   pkt6->ip6_hdr.flowlbl = 0;
 953   pkt6->ip6_hdr.paylgth = pkt->len;
 954   pkt6->ip6_hdr.nxthdr = 0x11;
 955   pkt6->ip6_hdr.hoplmt = 0xff;
 956
 957   unsigned int i;
 958   for (i = 0; i < 16; i++)
 959     pkt6->ip6_hdr.sadr[15-i] = addr[i];
 960
 961   memcpy(pkt6->ip6_hdr.dadr, (unsigned char[]){0x12, 0x34, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}, 16);
 962
 963   memcpy(&pkt6->udp_hdr, pkt, ntohs(pkt->len));
 964
 965   GNUNET_HashCode* key = address_mapping_exists(pkt6->ip6_hdr.sadr);
 966   GNUNET_assert (key != NULL);
 967
 968   struct map_entry *me = GNUNET_CONTAINER_multihashmap_get(hashmap, key);
 969
 970   GNUNET_free(key);
 971
 972   GNUNET_assert (me != NULL);
 973   GNUNET_assert (me->desc.service_type & htonl(GNUNET_DNS_SERVICE_TYPE_UDP));
 974   if (!port_in_ports(me->desc.ports, pkt6->udp_hdr.spt) ||
 975       !port_in_ports(me->additional_ports, pkt6->udp_hdr.spt)) {
 976       add_additional_port(me, pkt6->udp_hdr.spt);
 977   }
 978
 979   pkt6->udp_hdr.crc = 0;
 980   uint32_t sum = 0;
 981   sum = calculate_checksum_update(sum, (uint16_t*)&pkt6->ip6_hdr.sadr, 16);
 982   sum = calculate_checksum_update(sum, (uint16_t*)&pkt6->ip6_hdr.dadr, 16);
 983   uint32_t tmp = (pkt6->udp_hdr.len & 0xffff);
 984   sum = calculate_checksum_update(sum, (uint16_t*)&tmp, 4);
 985   tmp = htons(((pkt6->ip6_hdr.nxthdr & 0x00ff)));
 986   sum = calculate_checksum_update(sum, (uint16_t*)&tmp, 4);
 987
 988   sum = calculate_checksum_update(sum, (uint16_t*)&pkt6->udp_hdr, ntohs(pkt->len));
 989   pkt6->udp_hdr.crc = calculate_checksum_end(sum);
 990
 991
 992   /* FIXME */ GNUNET_DISK_file_write(fh_to_helper, pkt6, size);
 993
 994   return GNUNET_OK;
 995 }
 996
 997 static int
 998 receive_udp_service (void *cls, const struct GNUNET_PeerIdentity *other,
 999                      const struct GNUNET_MessageHeader *message,
1000                      const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1001 {
1002   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received UDP-Packet from peer %s\n",
1003               GNUNET_i2s (other));
1004   GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
1005   struct udp_pkt *pkt = (struct udp_pkt *) (desc + 1);
1006
1007   /* FIXME -> check acl etc */
1008   GNUNET_assert (ntohs (pkt->len) ==
1009                  ntohs (message->size) -
1010                  sizeof (struct GNUNET_MessageHeader) -
1011                  sizeof (GNUNET_HashCode));
1012
1013   size_t state_size = sizeof (struct udp_state);
1014   size_t cls_size = sizeof (struct send_cls) + ntohs (pkt->len);
1015   struct send_cls *send = GNUNET_malloc (cls_size);
1016   struct udp_state *state = &send->state;
1017   unsigned int new = GNUNET_NO;
1018
1019   memcpy (&state->peer, other, sizeof (struct GNUNET_PeerIdentity));
1020   memcpy (&state->desc, desc, sizeof (GNUNET_HashCode));
1021   state->spt = ntohs (pkt->spt);
1022
1023   /* Hash without the dpt, so that eg tftp works */
1024   state->dpt = 0;
1025
1026   memcpy (send + 1, pkt, ntohs (pkt->len));
1027
1028   GNUNET_HashCode hash;
1029   GNUNET_CRYPTO_hash (state, state_size, &hash);
1030
1031   state->dpt = ntohs (pkt->dpt);
1032
1033   struct GNUNET_NETWORK_Handle *sock =
1034     GNUNET_CONTAINER_multihashmap_get (udp_connections, &hash);
1035
1036   if (sock == NULL)
1037     {
1038       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Creating new Socket!\n");
1039       sock = GNUNET_NETWORK_socket_create (AF_INET, SOCK_DGRAM, 0);
1040       new = GNUNET_YES;
1041     }
1042
1043   send->sock = sock;
1044
1045   GNUNET_CONTAINER_multihashmap_put (udp_connections, &hash, sock,
1046                                      GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1047
1048
1049   if (new)
1050     {
1051       struct send_cls *recv = GNUNET_malloc (sizeof (struct send_cls));
1052       memcpy (recv, send, sizeof (struct send_cls));
1053       GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL, sock,
1054                                      receive_from_network, recv);
1055     }
1056
1057   GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL, sock,
1058                                   send_to_network, send);
1059
1060   return GNUNET_OK;
1061 }
1062
1063 /**
1064  * Main function that will be run by the scheduler.
1065  *
1066  * @param cls closure
1067  * @param args remaining command-line arguments
1068  * @param cfgfile name of the configuration file used (for saving, can be NULL!)
1069  * @param cfg_ configuration
1070  */
1071 static void
1072 run (void *cls,
1073      char *const *args,
1074      const char *cfgfile,
1075      const struct GNUNET_CONFIGURATION_Handle *cfg_) {
1076     const static struct GNUNET_CORE_MessageHandler handlers[] = {
1077           {receive_udp_service, GNUNET_MESSAGE_TYPE_SERVICE_UDP, 0},
1078           {receive_udp_back, GNUNET_MESSAGE_TYPE_SERVICE_UDP_BACK, 0},
1079           {NULL, 0, 0}
1080     };
1081     core_handle = GNUNET_CORE_connect(cfg_,
1082                                       42,
1083                                       NULL,
1084                                       NULL,
1085                                       NULL,
1086                                       NULL,
1087                                       NULL,
1088                                       NULL,
1089                                       0,
1090                                       NULL,
1091                                       0,
1092                                       handlers);
1093     mst = GNUNET_SERVER_mst_create(&message_token, NULL);
1094     cfg = cfg_;
1095     restart_hijack = 0;
1096     hashmap = GNUNET_CONTAINER_multihashmap_create(65536);
1097     udp_connections = GNUNET_CONTAINER_multihashmap_create(65536);
1098     GNUNET_SCHEDULER_add_now (connect_to_service_dns, NULL);
1099     GNUNET_SCHEDULER_add_now (start_helper_and_schedule, NULL);
1100     GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_UNIT_FOREVER_REL, &cleanup, cls);
1101 }
1102
1103 /**
1104  * The main function to obtain template from gnunetd.
1105  *
1106  * @param argc number of arguments from the command line
1107  * @param argv command line arguments
1108  * @return 0 ok, 1 on error
1109  */
1110 int
1111 main (int argc, char *const *argv) {
1112     static const struct GNUNET_GETOPT_CommandLineOption options[] = {
1113         GNUNET_GETOPT_OPTION_END
1114     };
1115
1116     return (GNUNET_OK ==
1117             GNUNET_PROGRAM_run (argc,
1118                                 argv,
1119                                 "gnunet-daemon-vpn",
1120                                 gettext_noop ("help text"),
1121                                 options, &run, NULL)) ? ret : 1;
1122 }
1123
1124 /* end of gnunet-daemon-vpn.c */