2 This file is part of GNUnet.
3 (C) 2010 Christian Grothoff
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.
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.
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.
22 * @file vpn/gnunet-daemon-vpn.c
24 * @author Philipp Toelke
27 #include "gnunet_getopt_lib.h"
28 #include "gnunet_program_lib.h"
29 #include "gnunet-vpn-packet.h"
30 #include "gnunet_common.h"
31 #include "gnunet_protocols.h"
32 #include "gnunet_applications.h"
33 #include <gnunet_mesh_service.h>
34 #include "gnunet_client_lib.h"
35 #include "gnunet_container_lib.h"
36 #include "gnunet_constants.h"
37 #include <block_dns.h>
38 #include "gnunet-daemon-vpn-helper.h"
39 #include "gnunet-daemon-vpn-dns.h"
40 #include "gnunet-daemon-vpn.h"
41 #include "gnunet-vpn-checksum.h"
43 const struct GNUNET_CONFIGURATION_Handle *cfg;
44 struct GNUNET_MESH_Handle *mesh_handle;
45 struct GNUNET_CONTAINER_MultiHashMap *hashmap;
46 static struct GNUNET_CONTAINER_Heap *heap;
48 struct tunnel_notify_queue
50 struct tunnel_notify_queue *next;
51 struct tunnel_notify_queue *prev;
57 * If there are at least this many address-mappings, old ones will be removed
59 static long long unsigned int max_mappings = 200;
67 * This hashmap contains the mapping from peer, service-descriptor,
68 * source-port and destination-port to a socket
70 static struct GNUNET_CONTAINER_MultiHashMap *udp_connections;
72 GNUNET_SCHEDULER_TaskIdentifier conn_task;
74 GNUNET_SCHEDULER_TaskIdentifier shs_task;
77 * Function scheduled as very last function, cleans up after us
82 __attribute__ ((unused)),
83 const struct GNUNET_SCHEDULER_TaskContext *tskctx)
85 GNUNET_assert (0 != (tskctx->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN));
88 cleanup_helper (helper_handle);
90 /* close the connection to the service-dns */
91 if (dns_connection != NULL)
93 GNUNET_CLIENT_disconnect (dns_connection, GNUNET_NO);
94 dns_connection = NULL;
97 if (mesh_handle != NULL)
99 GNUNET_MESH_disconnect (mesh_handle);
102 if (GNUNET_SCHEDULER_NO_TASK != shs_task)
104 GNUNET_SCHEDULER_cancel (shs_task);
105 shs_task = GNUNET_SCHEDULER_NO_TASK;
107 if (GNUNET_SCHEDULER_NO_TASK != conn_task)
109 GNUNET_SCHEDULER_cancel (conn_task);
110 conn_task = GNUNET_SCHEDULER_NO_TASK;
117 * @return the hash of the IP-Address if a mapping exists, NULL otherwise
120 address6_mapping_exists (unsigned char addr[])
122 GNUNET_HashCode *key = GNUNET_malloc (sizeof (GNUNET_HashCode));
123 unsigned char *k = (unsigned char *) key;
125 memset (key, 0, sizeof (GNUNET_HashCode));
128 for (i = 0; i < 16; i++)
131 if (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains (hashmap, key))
141 * @return the hash of the IP-Address if a mapping exists, NULL otherwise
144 address4_mapping_exists (uint32_t addr)
146 GNUNET_HashCode *key = GNUNET_malloc (sizeof (GNUNET_HashCode));
148 memset (key, 0, sizeof (GNUNET_HashCode));
149 unsigned char *c = (unsigned char *) &addr;
150 unsigned char *k = (unsigned char *) key;
153 for (i = 0; i < 4; i++)
156 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
157 "a4_m_e: getting with key %08x, addr is %08x, %d.%d.%d.%d\n",
158 *((uint32_t *) (key)), addr, c[0], c[1], c[2], c[3]);
160 if (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains (hashmap, key))
165 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Mapping not found!\n");
171 collect_mappings (void *cls
172 __attribute__ ((unused)),
173 const struct GNUNET_SCHEDULER_TaskContext *tc)
175 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
178 struct map_entry *me = GNUNET_CONTAINER_heap_remove_root (heap);
180 /* This is free()ed memory! */
181 me->heap_node = NULL;
183 /* FIXME! GNUNET_MESH_close_tunnel(me->tunnel); */
185 GNUNET_assert (GNUNET_YES ==
186 GNUNET_CONTAINER_multihashmap_remove (hashmap, &me->hash, me));
192 send_icmp4_response (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
194 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
197 struct ip_icmp *request = cls;
199 struct ip_icmp *response = alloca (ntohs (request->shdr.size));
201 GNUNET_assert (response != NULL);
202 memset (response, 0, ntohs (request->shdr.size));
204 response->shdr.size = request->shdr.size;
205 response->shdr.type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
207 response->tun.flags = 0;
208 response->tun.type = htons (0x0800);
210 response->ip_hdr.hdr_lngth = 5;
211 response->ip_hdr.version = 4;
212 response->ip_hdr.proto = 0x01;
213 response->ip_hdr.dadr = request->ip_hdr.sadr;
214 response->ip_hdr.sadr = request->ip_hdr.dadr;
215 response->ip_hdr.tot_lngth = request->ip_hdr.tot_lngth;
217 response->ip_hdr.chks =
218 calculate_ip_checksum ((uint16_t *) & response->ip_hdr, 20);
220 response->icmp_hdr.code = 0;
221 response->icmp_hdr.type = 0x0;
223 /* Magic, more Magic! */
224 response->icmp_hdr.chks = request->icmp_hdr.chks + 0x8;
226 /* Copy the rest of the packet */
227 memcpy (response + 1, request + 1,
228 ntohs (request->shdr.size) - sizeof (struct ip_icmp));
230 write_to_helper (response, ntohs (response->shdr.size));
232 GNUNET_free (request);
236 send_icmp6_response (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
238 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
241 struct ip6_icmp *request = cls;
243 struct ip6_icmp *response = alloca (ntohs (request->shdr.size));
245 GNUNET_assert (response != NULL);
246 memset (response, 0, ntohs (request->shdr.size));
248 response->shdr.size = request->shdr.size;
249 response->shdr.type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
251 response->tun.flags = 0;
252 response->tun.type = htons (0x86dd);
254 response->ip6_hdr.hoplmt = 255;
255 response->ip6_hdr.paylgth = request->ip6_hdr.paylgth;
256 response->ip6_hdr.nxthdr = 0x3a;
257 response->ip6_hdr.version = 6;
258 memcpy (&response->ip6_hdr.sadr, &request->ip6_hdr.dadr, 16);
259 memcpy (&response->ip6_hdr.dadr, &request->ip6_hdr.sadr, 16);
261 response->icmp_hdr.code = 0;
262 response->icmp_hdr.type = 0x81;
264 /* Magic, more Magic! */
265 response->icmp_hdr.chks = request->icmp_hdr.chks - 0x1;
267 /* Copy the rest of the packet */
268 memcpy (response + 1, request + 1,
269 ntohs (request->shdr.size) - sizeof (struct ip6_icmp));
271 write_to_helper (response, ntohs (response->shdr.size));
273 GNUNET_free (request);
277 * cls is the pointer to a GNUNET_MessageHeader that is
278 * followed by the service-descriptor and the packet that should be sent;
281 send_pkt_to_peer_notify_callback (void *cls, size_t size, void *buf)
283 struct GNUNET_MESH_Tunnel **tunnel = cls;
285 GNUNET_MESH_tunnel_set_data (*tunnel, NULL);
289 struct GNUNET_MessageHeader *hdr =
290 (struct GNUNET_MessageHeader *) (tunnel + 1);
291 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
292 "send_pkt_to_peer_notify_callback: buf = %x; size = %u;\n", buf,
294 GNUNET_assert (size >= ntohs (hdr->size));
295 memcpy (buf, hdr, ntohs (hdr->size));
296 size = ntohs (hdr->size);
297 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sent!\n");
302 if (NULL != GNUNET_MESH_tunnel_get_head (*tunnel))
304 struct tunnel_notify_queue *element = GNUNET_MESH_tunnel_get_head (*tunnel);
305 struct tunnel_notify_queue *head = GNUNET_MESH_tunnel_get_head (*tunnel);
306 struct tunnel_notify_queue *tail = GNUNET_MESH_tunnel_get_tail (*tunnel);
308 GNUNET_CONTAINER_DLL_remove (head, tail, element);
310 GNUNET_MESH_tunnel_set_head (*tunnel, head);
311 GNUNET_MESH_tunnel_set_tail (*tunnel, tail);
313 struct GNUNET_MESH_TransmitHandle *th =
314 GNUNET_MESH_notify_transmit_ready (*tunnel,
317 GNUNET_TIME_relative_divide
318 (GNUNET_CONSTANTS_MAX_CORK_DELAY, 2),
319 (const struct GNUNET_PeerIdentity *)
321 send_pkt_to_peer_notify_callback,
324 /* save the handle */
325 GNUNET_MESH_tunnel_set_data (*tunnel, th);
326 GNUNET_free (element);
334 port_in_ports (uint64_t ports, uint16_t port)
336 uint16_t *ps = (uint16_t *) & ports;
338 return ports == 0 || ps[0] == port || ps[1] == port || ps[2] == port || ps[3] == port;
342 send_pkt_to_peer (void *cls, const struct GNUNET_PeerIdentity *peer,
343 const struct GNUNET_TRANSPORT_ATS_Information *atsi
344 __attribute__ ((unused)))
346 /* peer == NULL means that all peers in this request are connected */
349 struct GNUNET_MESH_Tunnel **tunnel = cls;
350 struct GNUNET_MessageHeader *hdr =
351 (struct GNUNET_MessageHeader *) (tunnel + 1);
353 GNUNET_assert (NULL != tunnel);
354 GNUNET_assert (NULL != *tunnel);
356 if (NULL == GNUNET_MESH_tunnel_get_data (*tunnel))
358 struct GNUNET_MESH_TransmitHandle *th =
359 GNUNET_MESH_notify_transmit_ready (*tunnel,
362 GNUNET_TIME_relative_divide
363 (GNUNET_CONSTANTS_MAX_CORK_DELAY, 2),
364 (const struct GNUNET_PeerIdentity *)
367 send_pkt_to_peer_notify_callback,
370 GNUNET_MESH_tunnel_set_data (*tunnel, th);
374 struct tunnel_notify_queue *head = GNUNET_MESH_tunnel_get_head (*tunnel);
375 struct tunnel_notify_queue *tail = GNUNET_MESH_tunnel_get_tail (*tunnel);
376 struct tunnel_notify_queue *element = GNUNET_malloc (sizeof *element);
379 element->len = ntohs (hdr->size);
381 GNUNET_CONTAINER_DLL_insert_tail (head, tail, element);
383 GNUNET_MESH_tunnel_set_head (*tunnel, head);
384 GNUNET_MESH_tunnel_set_tail (*tunnel, tail);
389 * Create a new Address from an answer-packet
392 new_ip6addr (unsigned char *buf, const GNUNET_HashCode * peer,
393 const GNUNET_HashCode * service_desc)
396 unsigned long long ipv6prefix;
398 GNUNET_assert (GNUNET_OK ==
399 GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "IPV6ADDR",
401 GNUNET_assert (GNUNET_OK ==
402 GNUNET_CONFIGURATION_get_value_number (cfg, "vpn",
405 GNUNET_assert (ipv6prefix < 127);
406 ipv6prefix = (ipv6prefix + 7) / 8;
408 inet_pton (AF_INET6, ipv6addr, buf);
409 GNUNET_free (ipv6addr);
411 int peer_length = 16 - ipv6prefix - 6;
413 if (peer_length <= 0)
416 int service_length = 16 - ipv6prefix - peer_length;
418 if (service_length <= 0)
421 memcpy (buf + ipv6prefix, service_desc, service_length);
422 memcpy (buf + ipv6prefix + service_length, peer, peer_length);
429 * Create a new Address from an answer-packet
432 new_ip6addr_remote (unsigned char *buf, unsigned char *addr, char addrlen)
435 unsigned long long ipv6prefix;
437 GNUNET_assert (GNUNET_OK ==
438 GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "IPV6ADDR",
440 GNUNET_assert (GNUNET_OK ==
441 GNUNET_CONFIGURATION_get_value_number (cfg, "vpn",
444 GNUNET_assert (ipv6prefix < 127);
445 ipv6prefix = (ipv6prefix + 7) / 8;
447 inet_pton (AF_INET6, ipv6addr, buf);
448 GNUNET_free (ipv6addr);
450 int local_length = 16 - ipv6prefix;
452 memcpy (buf + ipv6prefix, addr, GNUNET_MIN (addrlen, local_length));
458 * Create a new Address from an answer-packet
461 new_ip4addr_remote (unsigned char *buf, unsigned char *addr, char addrlen)
466 GNUNET_assert (GNUNET_OK ==
467 GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "IPV4ADDR",
469 GNUNET_assert (GNUNET_OK ==
470 GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "IPV4MASK",
474 inet_pton (AF_INET, ipv4addr, buf);
475 int r = inet_pton (AF_INET, ipv4mask, &mask);
478 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "inet_pton: %d; %m; mask: %08x\n", r,
481 GNUNET_free (ipv4addr);
487 mask = (mask ^ (mask - 1)) >> 1;
488 for (c = 0; mask; c++)
495 c = CHAR_BIT * sizeof (mask);
499 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "The mask %s has %d leading 1s.\n",
502 GNUNET_free (ipv4mask);
509 memcpy (buf + c, addr, GNUNET_MIN (addrlen, 4 - c));
515 * This gets scheduled with cls pointing to an answer_packet and does everything
516 * needed in order to send it to the helper.
518 * At the moment this means "inventing" and IPv6-Address for .gnunet-services and
519 * doing nothing for "real" services.
522 process_answer (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
524 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
527 struct answer_packet *pkt = cls;
528 struct answer_packet_list *list;
530 /* This answer is about a .gnunet-service
532 * It contains an almost complete DNS-Response, we have to fill in the ip
533 * at the offset pkt->addroffset
535 if (pkt->subtype == GNUNET_DNS_ANSWER_TYPE_SERVICE)
537 pkt->subtype = GNUNET_DNS_ANSWER_TYPE_IP;
541 memset (&key, 0, sizeof (GNUNET_HashCode));
543 unsigned char *c = ((unsigned char *) pkt) + ntohs (pkt->addroffset);
544 unsigned char *k = (unsigned char *) &key;
546 new_ip6addr (c, &pkt->service_descr.peer,
547 &pkt->service_descr.service_descriptor);
549 * Copy the newly generated ip-address to the key backwarts (as only the first part is hashed)
553 for (i = 0; i < 16; i++)
556 uint16_t namelen = strlen ((char *) pkt->data + 12) + 1;
558 struct map_entry *value =
559 GNUNET_malloc (sizeof (struct map_entry) + namelen);
560 char *name = (char *) (value + 1);
562 value->namelen = namelen;
563 memcpy (name, pkt->data + 12, namelen);
565 memcpy (&value->desc, &pkt->service_descr,
566 sizeof (struct GNUNET_vpn_service_descriptor));
568 memset (value->additional_ports, 0, 8192);
570 memcpy (&value->hash, &key, sizeof (GNUNET_HashCode));
572 if (GNUNET_NO == GNUNET_CONTAINER_multihashmap_contains (hashmap, &key))
574 GNUNET_CONTAINER_multihashmap_put (hashmap, &key, value,
575 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
578 GNUNET_CONTAINER_heap_insert (heap, value,
579 GNUNET_TIME_absolute_get ().abs_value);
580 if (GNUNET_CONTAINER_heap_get_size (heap) > max_mappings)
581 GNUNET_SCHEDULER_add_now (collect_mappings, NULL);
588 GNUNET_malloc (htons (pkt->hdr.size) +
589 2 * sizeof (struct answer_packet_list *));
591 memcpy (&list->pkt, pkt, htons (pkt->hdr.size));
594 else if (pkt->subtype == GNUNET_DNS_ANSWER_TYPE_REV)
598 memset (&key, 0, sizeof key);
599 unsigned char *k = (unsigned char *) &key;
600 unsigned char *s = pkt->data + 12;
603 /* Whoever designed the reverse IPv6-lookup is batshit insane */
604 for (i = 0; i < 16; i++)
606 unsigned char c1 = s[(4 * i) + 1];
607 unsigned char c2 = s[(4 * i) + 3];
612 k[i] = c1 - 87; /* 87 is the difference between 'a' and 10 */
614 k[i] += 16 * (c2 - '0');
616 k[i] += 16 * (c2 - 87);
619 struct map_entry *map_entry =
620 GNUNET_CONTAINER_multihashmap_get (hashmap, &key);
621 uint16_t offset = ntohs (pkt->addroffset);
623 if (map_entry == NULL)
629 GNUNET_CONTAINER_heap_update_cost (heap, map_entry->heap_node,
630 GNUNET_TIME_absolute_get ().abs_value);
633 unsigned short namelen = htons (map_entry->namelen);
634 char *name = (char *) (map_entry + 1);
637 GNUNET_malloc (2 * sizeof (struct answer_packet_list *) + offset + 2 +
640 struct answer_packet *rpkt = &list->pkt;
642 /* The offset points to the first byte belonging to the address */
643 memcpy (rpkt, pkt, offset - 1);
645 rpkt->subtype = GNUNET_DNS_ANSWER_TYPE_IP;
646 rpkt->hdr.size = ntohs (offset + 2 + ntohs (namelen));
648 memcpy (((char *) rpkt) + offset, &namelen, 2);
649 memcpy (((char *) rpkt) + offset + 2, name, ntohs (namelen));
652 else if (pkt->subtype == GNUNET_DNS_ANSWER_TYPE_IP)
655 GNUNET_malloc (htons (pkt->hdr.size) +
656 2 * sizeof (struct answer_packet_list *));
657 memcpy (&list->pkt, pkt, htons (pkt->hdr.size));
659 else if (pkt->subtype == GNUNET_DNS_ANSWER_TYPE_REMOTE_AAAA)
661 pkt->subtype = GNUNET_DNS_ANSWER_TYPE_IP;
665 memset (&key, 0, sizeof (GNUNET_HashCode));
667 unsigned char *c = ((unsigned char *) pkt) + ntohs (pkt->addroffset);
669 new_ip6addr_remote (c, pkt->addr, pkt->addrsize);
670 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
671 "New mapping to %02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x\n",
672 c[0], c[1], c[2], c[3], c[4], c[5], c[6], c[7], c[8], c[9],
673 c[10], c[11], c[12], c[13], c[14], c[15]);
674 unsigned char *k = (unsigned char *) &key;
677 * Copy the newly generated ip-address to the key backwards (as only the first part is used in the hash-table)
681 for (i = 0; i < 16; i++)
684 uint16_t namelen = strlen ((char *) pkt->data + 12) + 1;
686 struct map_entry *value =
687 GNUNET_malloc (sizeof (struct map_entry) + namelen);
688 char *name = (char *) (value + 1);
690 value->namelen = namelen;
691 memcpy (name, pkt->data + 12, namelen);
693 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Setting addrlen to %d\n",
695 value->addrlen = pkt->addrsize;
696 memcpy (&value->addr, &pkt->addr, pkt->addrsize);
697 memset (value->additional_ports, 0, 8192);
699 memcpy (&value->hash, &key, sizeof (GNUNET_HashCode));
701 if (GNUNET_NO == GNUNET_CONTAINER_multihashmap_contains (hashmap, &key))
703 GNUNET_CONTAINER_multihashmap_put (hashmap, &key, value,
704 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
706 GNUNET_CONTAINER_heap_insert (heap, value,
707 GNUNET_TIME_absolute_get ().abs_value);
708 if (GNUNET_CONTAINER_heap_get_size (heap) > max_mappings)
709 GNUNET_SCHEDULER_add_now (collect_mappings, NULL);
715 GNUNET_malloc (htons (pkt->hdr.size) +
716 2 * sizeof (struct answer_packet_list *));
718 memcpy (&list->pkt, pkt, htons (pkt->hdr.size));
720 else if (pkt->subtype == GNUNET_DNS_ANSWER_TYPE_REMOTE_A)
722 pkt->subtype = GNUNET_DNS_ANSWER_TYPE_IP;
726 memset (&key, 0, sizeof (GNUNET_HashCode));
728 unsigned char *c = ((unsigned char *) pkt) + ntohs (pkt->addroffset);
730 new_ip4addr_remote (c, pkt->addr, pkt->addrsize);
731 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "New mapping to %d.%d.%d.%d\n", c[0],
733 unsigned char *k = (unsigned char *) &key;
736 * Copy the newly generated ip-address to the key backwards (as only the first part is used in the hash-table)
740 for (i = 0; i < 4; i++)
743 uint16_t namelen = strlen ((char *) pkt->data + 12) + 1;
745 struct map_entry *value =
746 GNUNET_malloc (sizeof (struct map_entry) + namelen);
747 char *name = (char *) (value + 1);
749 value->namelen = namelen;
750 memcpy (name, pkt->data + 12, namelen);
752 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Setting addrlen to %d\n",
754 value->addrlen = pkt->addrsize;
755 memcpy (&value->addr, &pkt->addr, pkt->addrsize);
756 memset (value->additional_ports, 0, 8192);
758 memcpy (&value->hash, &key, sizeof (GNUNET_HashCode));
760 if (GNUNET_NO == GNUNET_CONTAINER_multihashmap_contains (hashmap, &key))
762 GNUNET_CONTAINER_multihashmap_put (hashmap, &key, value,
763 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
765 GNUNET_CONTAINER_heap_insert (heap, value,
766 GNUNET_TIME_absolute_get ().abs_value);
767 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
768 "Mapping is saved in the hashmap with key %08x.\n",
769 *((uint32_t *) (&key)));
770 if (GNUNET_CONTAINER_heap_get_size (heap) > max_mappings)
771 GNUNET_SCHEDULER_add_now (collect_mappings, NULL);
777 GNUNET_malloc (htons (pkt->hdr.size) +
778 2 * sizeof (struct answer_packet_list *));
780 memcpy (&list->pkt, pkt, htons (pkt->hdr.size));
791 GNUNET_CONTAINER_DLL_insert_after (answer_proc_head, answer_proc_tail,
792 answer_proc_tail, list);
794 schedule_helper_write (GNUNET_TIME_UNIT_FOREVER_REL, NULL);
800 * Sets a bit active in a bitArray.
802 * @param bitArray memory area to set the bit in
803 * @param bitIdx which bit to set
806 setBit (char *bitArray, unsigned int bitIdx)
809 unsigned int targetBit;
811 arraySlot = bitIdx / 8;
812 targetBit = (1L << (bitIdx % 8));
813 bitArray[arraySlot] |= targetBit;
817 * Clears a bit from bitArray.
819 * @param bitArray memory area to set the bit in
820 * @param bitIdx which bit to unset
823 clearBit (char *bitArray, unsigned int bitIdx)
826 unsigned int targetBit;
829 targetBit = (1L << (bitIdx % 8));
830 bitArray[slot] = bitArray[slot] & (~targetBit);
834 * Checks if a bit is active in the bitArray
836 * @param bitArray memory area to set the bit in
837 * @param bitIdx which bit to test
838 * @return GNUNET_YES if the bit is set, GNUNET_NO if not.
841 testBit (char *bitArray, unsigned int bitIdx)
844 unsigned int targetBit;
847 targetBit = (1L << (bitIdx % 8));
848 if (bitArray[slot] & targetBit)
855 * @brief Add the port to the list of additional ports in the map_entry
857 * @param me the map_entry
858 * @param port the port in host-byte-order
861 add_additional_port (struct map_entry *me, uint16_t port)
863 setBit (me->additional_ports, port);
867 receive_udp_back (void *cls
868 __attribute__ ((unused)), struct GNUNET_MESH_Tunnel *tunnel,
870 __attribute__ ((unused)),
871 const struct GNUNET_PeerIdentity *sender
872 __attribute__ ((unused)),
873 const struct GNUNET_MessageHeader *message,
874 const struct GNUNET_TRANSPORT_ATS_Information *atsi
875 __attribute__ ((unused)))
877 GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
878 struct remote_addr *s = (struct remote_addr *) desc;
879 struct udp_pkt *pkt = (struct udp_pkt *) (desc + 1);
880 const struct GNUNET_PeerIdentity *other = GNUNET_MESH_get_peer (tunnel);
882 if (16 == s->addrlen)
885 sizeof (struct ip6_udp) + ntohs (pkt->len) - 1 -
886 sizeof (struct udp_pkt);
888 struct ip6_udp *pkt6 = alloca (size);
890 GNUNET_assert (pkt6 != NULL);
892 if (ntohs (message->type) == GNUNET_MESSAGE_TYPE_VPN_SERVICE_UDP_BACK)
893 new_ip6addr (pkt6->ip6_hdr.sadr, &other->hashPubKey, desc);
895 new_ip6addr_remote (pkt6->ip6_hdr.sadr, s->addr, s->addrlen);
897 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
898 "Relaying calc:%d gnu:%d udp:%d bytes!\n", size,
899 ntohs (message->size), ntohs (pkt->len));
901 pkt6->shdr.type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
902 pkt6->shdr.size = htons (size);
905 pkt6->tun.type = htons (0x86dd);
907 pkt6->ip6_hdr.version = 6;
908 pkt6->ip6_hdr.tclass_h = 0;
909 pkt6->ip6_hdr.tclass_l = 0;
910 pkt6->ip6_hdr.flowlbl = 0;
911 pkt6->ip6_hdr.paylgth = pkt->len;
912 pkt6->ip6_hdr.nxthdr = IPPROTO_UDP;
913 pkt6->ip6_hdr.hoplmt = 0xff;
918 GNUNET_assert (GNUNET_OK ==
919 GNUNET_CONFIGURATION_get_value_string (cfg, "vpn",
922 inet_pton (AF_INET6, ipv6addr, pkt6->ip6_hdr.dadr);
923 GNUNET_free (ipv6addr);
925 memcpy (&pkt6->udp_hdr, pkt, ntohs (pkt->len));
927 GNUNET_HashCode *key = address6_mapping_exists (pkt6->ip6_hdr.sadr);
929 GNUNET_assert (key != NULL);
931 struct map_entry *me = GNUNET_CONTAINER_multihashmap_get (hashmap, key);
933 GNUNET_CONTAINER_heap_update_cost (heap, me->heap_node,
934 GNUNET_TIME_absolute_get ().abs_value);
938 GNUNET_assert (me != NULL);
939 if (ntohs (message->type) == GNUNET_MESSAGE_TYPE_VPN_SERVICE_UDP_BACK)
941 GNUNET_assert (me->desc.
942 service_type & htonl (GNUNET_DNS_SERVICE_TYPE_UDP));
943 if (!port_in_ports (me->desc.ports, pkt6->udp_hdr.spt) &&
944 !testBit (me->additional_ports, ntohs (pkt6->udp_hdr.spt)))
946 add_additional_port (me, ntohs (pkt6->udp_hdr.spt));
950 pkt6->udp_hdr.crc = 0;
954 calculate_checksum_update (sum, (uint16_t *) & pkt6->ip6_hdr.sadr, 16);
956 calculate_checksum_update (sum, (uint16_t *) & pkt6->ip6_hdr.dadr, 16);
957 uint32_t tmp = (pkt6->udp_hdr.len & 0xffff);
959 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
960 tmp = htons (((pkt6->ip6_hdr.nxthdr & 0x00ff)));
961 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
964 calculate_checksum_update (sum, (uint16_t *) & pkt6->udp_hdr,
966 pkt6->udp_hdr.crc = calculate_checksum_end (sum);
968 write_to_helper (pkt6, size);
973 sizeof (struct ip_udp) + ntohs (pkt->len) - 1 - sizeof (struct udp_pkt);
975 struct ip_udp *pkt4 = alloca (size);
977 GNUNET_assert (pkt4 != NULL);
979 GNUNET_assert (ntohs (message->type) ==
980 GNUNET_MESSAGE_TYPE_VPN_REMOTE_UDP_BACK);
983 new_ip4addr_remote ((unsigned char *) &sadr, s->addr, s->addrlen);
984 pkt4->ip_hdr.sadr = sadr;
986 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
987 "Relaying calc:%d gnu:%d udp:%d bytes!\n", size,
988 ntohs (message->size), ntohs (pkt->len));
990 pkt4->shdr.type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
991 pkt4->shdr.size = htons (size);
994 pkt4->tun.type = htons (0x0800);
996 pkt4->ip_hdr.version = 4;
997 pkt4->ip_hdr.hdr_lngth = 5;
998 pkt4->ip_hdr.diff_serv = 0;
999 pkt4->ip_hdr.tot_lngth = htons (20 + ntohs (pkt->len));
1000 pkt4->ip_hdr.ident = 0;
1001 pkt4->ip_hdr.flags = 0;
1002 pkt4->ip_hdr.frag_off = 0;
1003 pkt4->ip_hdr.ttl = 255;
1004 pkt4->ip_hdr.proto = IPPROTO_UDP;
1005 pkt4->ip_hdr.chks = 0; /* Will be calculated later */
1011 GNUNET_assert (GNUNET_OK ==
1012 GNUNET_CONFIGURATION_get_value_string (cfg, "vpn",
1015 inet_pton (AF_INET, ipv4addr, &dadr);
1016 GNUNET_free (ipv4addr);
1017 pkt4->ip_hdr.dadr = dadr;
1019 memcpy (&pkt4->udp_hdr, pkt, ntohs (pkt->len));
1021 GNUNET_HashCode *key = address4_mapping_exists (pkt4->ip_hdr.sadr);
1023 GNUNET_assert (key != NULL);
1025 struct map_entry *me = GNUNET_CONTAINER_multihashmap_get (hashmap, key);
1027 GNUNET_CONTAINER_heap_update_cost (heap, me->heap_node,
1028 GNUNET_TIME_absolute_get ().abs_value);
1032 GNUNET_assert (me != NULL);
1034 pkt4->udp_hdr.crc = 0; /* Optional for IPv4 */
1037 calculate_ip_checksum ((uint16_t *) & pkt4->ip_hdr, 5 * 4);
1039 write_to_helper (pkt4, size);
1046 receive_tcp_back (void *cls
1047 __attribute__ ((unused)), struct GNUNET_MESH_Tunnel *tunnel,
1049 __attribute__ ((unused)),
1050 const struct GNUNET_PeerIdentity *sender
1051 __attribute__ ((unused)),
1052 const struct GNUNET_MessageHeader *message,
1053 const struct GNUNET_TRANSPORT_ATS_Information *atsi
1054 __attribute__ ((unused)))
1056 GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
1057 struct remote_addr *s = (struct remote_addr *) desc;
1058 struct tcp_pkt *pkt = (struct tcp_pkt *) (desc + 1);
1059 const struct GNUNET_PeerIdentity *other = GNUNET_MESH_get_peer (tunnel);
1062 ntohs (message->size) - sizeof (struct GNUNET_MessageHeader) -
1063 sizeof (GNUNET_HashCode);
1065 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Received TCP-Packet back, addrlen = %d\n", s->addrlen);
1067 if (ntohs(message->type) == GNUNET_MESSAGE_TYPE_VPN_SERVICE_TCP_BACK ||
1070 size_t size = pktlen + sizeof (struct ip6_tcp) - 1;
1072 struct ip6_tcp *pkt6 = alloca (size);
1074 memset (pkt6, 0, size);
1076 GNUNET_assert (pkt6 != NULL);
1078 if (ntohs (message->type) == GNUNET_MESSAGE_TYPE_VPN_SERVICE_TCP_BACK)
1079 new_ip6addr (pkt6->ip6_hdr.sadr, &other->hashPubKey, desc);
1081 new_ip6addr_remote (pkt6->ip6_hdr.sadr, s->addr, s->addrlen);
1083 pkt6->shdr.type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
1084 pkt6->shdr.size = htons (size);
1086 pkt6->tun.flags = 0;
1087 pkt6->tun.type = htons (0x86dd);
1089 pkt6->ip6_hdr.version = 6;
1090 pkt6->ip6_hdr.tclass_h = 0;
1091 pkt6->ip6_hdr.tclass_l = 0;
1092 pkt6->ip6_hdr.flowlbl = 0;
1093 pkt6->ip6_hdr.paylgth = htons (pktlen);
1094 pkt6->ip6_hdr.nxthdr = IPPROTO_TCP;
1095 pkt6->ip6_hdr.hoplmt = 0xff;
1100 GNUNET_assert (GNUNET_OK ==
1101 GNUNET_CONFIGURATION_get_value_string (cfg, "vpn",
1104 inet_pton (AF_INET6, ipv6addr, pkt6->ip6_hdr.dadr);
1105 GNUNET_free (ipv6addr);
1107 memcpy (&pkt6->tcp_hdr, pkt, pktlen);
1109 GNUNET_HashCode *key = address6_mapping_exists (pkt6->ip6_hdr.sadr);
1111 GNUNET_assert (key != NULL);
1113 struct map_entry *me = GNUNET_CONTAINER_multihashmap_get (hashmap, key);
1115 GNUNET_CONTAINER_heap_update_cost (heap, me->heap_node,
1116 GNUNET_TIME_absolute_get ().abs_value);
1120 GNUNET_assert (me != NULL);
1121 if (ntohs (message->type) == GNUNET_MESSAGE_TYPE_VPN_SERVICE_UDP_BACK)
1122 GNUNET_assert (me->desc.
1123 service_type & htonl (GNUNET_DNS_SERVICE_TYPE_TCP));
1125 pkt6->tcp_hdr.crc = 0;
1130 calculate_checksum_update (sum, (uint16_t *) & pkt6->ip6_hdr.sadr, 16);
1132 calculate_checksum_update (sum, (uint16_t *) & pkt6->ip6_hdr.dadr, 16);
1133 tmp = htonl (pktlen);
1134 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
1135 tmp = htonl (((pkt6->ip6_hdr.nxthdr & 0x000000ff)));
1136 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
1139 calculate_checksum_update (sum, (uint16_t *) & pkt6->tcp_hdr,
1140 ntohs (pkt6->ip6_hdr.paylgth));
1141 pkt6->tcp_hdr.crc = calculate_checksum_end (sum);
1143 write_to_helper (pkt6, size);
1147 size_t size = pktlen + sizeof (struct ip_tcp) - 1;
1149 struct ip_tcp *pkt4 = alloca (size);
1151 GNUNET_assert (pkt4 != NULL);
1152 memset (pkt4, 0, size);
1154 GNUNET_assert (ntohs (message->type) ==
1155 GNUNET_MESSAGE_TYPE_VPN_REMOTE_TCP_BACK);
1158 new_ip4addr_remote ((unsigned char *) &sadr, s->addr, s->addrlen);
1159 pkt4->ip_hdr.sadr = sadr;
1161 pkt4->shdr.type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
1162 pkt4->shdr.size = htons (size);
1164 pkt4->tun.flags = 0;
1165 pkt4->tun.type = htons (0x0800);
1167 pkt4->ip_hdr.version = 4;
1168 pkt4->ip_hdr.hdr_lngth = 5;
1169 pkt4->ip_hdr.diff_serv = 0;
1170 pkt4->ip_hdr.tot_lngth = htons (20 + pktlen);
1171 pkt4->ip_hdr.ident = 0;
1172 pkt4->ip_hdr.flags = 0;
1173 pkt4->ip_hdr.frag_off = 0;
1174 pkt4->ip_hdr.ttl = 255;
1175 pkt4->ip_hdr.proto = IPPROTO_TCP;
1176 pkt4->ip_hdr.chks = 0; /* Will be calculated later */
1182 GNUNET_assert (GNUNET_OK ==
1183 GNUNET_CONFIGURATION_get_value_string (cfg, "vpn",
1186 inet_pton (AF_INET, ipv4addr, &dadr);
1187 GNUNET_free (ipv4addr);
1188 pkt4->ip_hdr.dadr = dadr;
1191 memcpy (&pkt4->tcp_hdr, pkt, pktlen);
1193 GNUNET_HashCode *key = address4_mapping_exists (pkt4->ip_hdr.sadr);
1195 GNUNET_assert (key != NULL);
1197 struct map_entry *me = GNUNET_CONTAINER_multihashmap_get (hashmap, key);
1199 GNUNET_CONTAINER_heap_update_cost (heap, me->heap_node,
1200 GNUNET_TIME_absolute_get ().abs_value);
1204 GNUNET_assert (me != NULL);
1205 pkt4->tcp_hdr.crc = 0;
1209 tmp = pkt4->ip_hdr.sadr;
1210 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
1211 tmp = pkt4->ip_hdr.dadr;
1212 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
1214 tmp = (0x06 << 16) | (0xffff & pktlen); // 0x06 for TCP?
1218 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
1220 sum = calculate_checksum_update (sum, (uint16_t *) & pkt4->tcp_hdr, pktlen);
1221 pkt4->tcp_hdr.crc = calculate_checksum_end (sum);
1224 calculate_ip_checksum ((uint16_t *) & pkt4->ip_hdr, 5 * 4);
1226 write_to_helper (pkt4, size);
1233 * Main function that will be run by the scheduler.
1235 * @param cls closure
1236 * @param args remaining command-line arguments
1237 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
1238 * @param cfg_ configuration
1241 run (void *cls, char *const *args __attribute__ ((unused)), const char *cfgfilep
1242 __attribute__ ((unused)), const struct GNUNET_CONFIGURATION_Handle *cfg_)
1244 static const struct GNUNET_MESH_MessageHandler handlers[] = {
1245 {receive_udp_back, GNUNET_MESSAGE_TYPE_VPN_SERVICE_UDP_BACK, 0},
1246 {receive_tcp_back, GNUNET_MESSAGE_TYPE_VPN_SERVICE_TCP_BACK, 0},
1247 {receive_udp_back, GNUNET_MESSAGE_TYPE_VPN_REMOTE_UDP_BACK, 0},
1248 {receive_tcp_back, GNUNET_MESSAGE_TYPE_VPN_REMOTE_TCP_BACK, 0},
1252 static const GNUNET_MESH_ApplicationType types[] = {
1253 GNUNET_APPLICATION_TYPE_END
1256 mesh_handle = GNUNET_MESH_connect (cfg_, NULL, NULL, handlers, types);
1259 hashmap = GNUNET_CONTAINER_multihashmap_create (65536);
1260 heap = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1261 GNUNET_CONFIGURATION_get_value_number (cfg, "vpn", "MAX_MAPPINGg",
1263 udp_connections = GNUNET_CONTAINER_multihashmap_create (65536);
1264 conn_task = GNUNET_SCHEDULER_add_now (connect_to_service_dns, NULL);
1266 GNUNET_SCHEDULER_add_after (conn_task, start_helper_and_schedule, NULL);
1267 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &cleanup, cls);
1271 * The main function to obtain template from gnunetd.
1273 * @param argc number of arguments from the command line
1274 * @param argv command line arguments
1275 * @return 0 ok, 1 on error
1278 main (int argc, char *const *argv)
1280 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
1281 GNUNET_GETOPT_OPTION_END
1284 return (GNUNET_OK ==
1285 GNUNET_PROGRAM_run (argc, argv, "vpn", gettext_noop ("help text"),
1286 options, &run, NULL)) ? ret : 1;
1289 /* end of gnunet-daemon-vpn.c */