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-exit.c
24 * @author Philipp Toelke
27 #include <gnunet_common.h>
28 #include <gnunet_program_lib.h>
29 #include <gnunet_protocols.h>
30 #include <gnunet_applications.h>
31 #include <gnunet_mesh_service.h>
32 #include <gnunet_constants.h>
35 #include "gnunet-vpn-packet.h"
36 #include "gnunet-helper-vpn-api.h"
37 #include "gnunet-vpn-checksum.h"
39 GNUNET_SCHEDULER_TaskIdentifier shs_task;
42 * The handle to the configuration used throughout the process
44 static const struct GNUNET_CONFIGURATION_Handle *cfg;
47 * The handle to the helper
49 struct GNUNET_VPN_HELPER_Handle *helper_handle;
59 static struct GNUNET_MESH_Handle *mesh_handle;
62 * This hashmaps contains the mapping from peer, service-descriptor,
63 * source-port and destination-port to a struct redirect_state
65 static struct GNUNET_CONTAINER_MultiHashMap *udp_connections;
66 static struct GNUNET_CONTAINER_Heap *udp_connections_heap;
67 static struct GNUNET_CONTAINER_MultiHashMap *tcp_connections;
68 static struct GNUNET_CONTAINER_Heap *tcp_connections_heap;
71 * If there are at least this many udp-Connections, old ones will be removed
73 static long long unsigned int max_udp_connections = 200;
76 * If there are at least this many tcp-Connections, old ones will be removed
78 static long long unsigned int max_tcp_connections = 200;
83 unsigned char addr[16];
88 * This struct is saved into the services-hashmap
90 struct redirect_service
115 * The source-address of this connection. When a packet to this address is
116 * received, this tunnel is used to forward it. ipv4-addresses will be put
117 * here left-aligned */
120 * The source-port of this connection
126 * This struct is saved into {tcp,udp}_connections;
128 struct redirect_state
130 struct GNUNET_MESH_Tunnel *tunnel;
131 GNUNET_HashCode desc;
132 struct redirect_service *serv;
133 struct remote_addr remote;
135 struct GNUNET_CONTAINER_HeapNode* heap_node;
136 struct GNUNET_CONTAINER_MultiHashMap *hashmap;
137 GNUNET_HashCode hash;
139 enum { SERVICE, REMOTE } type;
142 * The source-address and -port of this connection
144 struct redirect_info redirect_info;
148 * This hashmaps saves interesting things about the configured services
150 static struct GNUNET_CONTAINER_MultiHashMap *udp_services;
151 static struct GNUNET_CONTAINER_MultiHashMap *tcp_services;
153 struct tunnel_notify_queue
155 struct tunnel_notify_queue* next;
156 struct tunnel_notify_queue* prev;
162 * Function that frees everything from a hashmap
165 free_iterate(void* cls __attribute__((unused)), const GNUNET_HashCode* hash __attribute__((unused)), void* value)
172 * Function scheduled as very last function, cleans up after us
175 cleanup(void* cls __attribute__((unused)), const struct GNUNET_SCHEDULER_TaskContext* tskctx) {
176 GNUNET_assert (0 != (tskctx->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN));
178 GNUNET_CONTAINER_multihashmap_iterate(udp_connections,
182 GNUNET_CONTAINER_multihashmap_iterate(tcp_connections,
186 if (mesh_handle != NULL)
188 GNUNET_MESH_disconnect(mesh_handle);
194 collect_connections(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tc) {
195 if ( (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
199 struct GNUNET_CONTAINER_Heap *heap = cls;
201 struct redirect_state* state = GNUNET_CONTAINER_heap_remove_root(heap);
203 /* This is free()ed memory! */
204 state->heap_node = NULL;
206 /* FIXME! GNUNET_MESH_close_tunnel(state->tunnel); */
208 GNUNET_CONTAINER_multihashmap_remove(state->hashmap, &state->hash, state);
214 hash_redirect_info(GNUNET_HashCode* hash, struct redirect_info* u_i, size_t addrlen)
217 /* the gnunet hashmap only uses the first sizeof(unsigned int) of the hash
219 * build the hash out of the last bytes of the address and the 2 bytes of
222 memcpy(hash, &u_i->pt, sizeof(u_i->pt));
223 memcpy(((unsigned char*)hash)+2, u_i->addr+(addrlen-(sizeof(unsigned int) - 2)), (sizeof(unsigned int) - 2));
224 memset(((unsigned char*)hash)+sizeof(unsigned int), 0, sizeof(GNUNET_HashCode) - sizeof(unsigned int));
228 * cls is the pointer to a GNUNET_MessageHeader that is
229 * followed by the service-descriptor and the udp-packet that should be sent;
232 send_udp_to_peer_notify_callback (void *cls, size_t size, void *buf)
234 struct GNUNET_MESH_Tunnel** tunnel = cls;
235 GNUNET_MESH_tunnel_set_data(*tunnel, NULL);
236 struct GNUNET_MessageHeader *hdr = (struct GNUNET_MessageHeader*)(tunnel + 1);
237 GNUNET_assert (size >= ntohs (hdr->size));
238 memcpy (buf, hdr, ntohs (hdr->size));
239 size = ntohs(hdr->size);
241 if (NULL != GNUNET_MESH_tunnel_get_head(*tunnel))
243 struct tunnel_notify_queue* element = GNUNET_MESH_tunnel_get_head(*tunnel);
244 struct tunnel_notify_queue* head = GNUNET_MESH_tunnel_get_head(*tunnel);
245 struct tunnel_notify_queue* tail = GNUNET_MESH_tunnel_get_tail(*tunnel);
247 GNUNET_CONTAINER_DLL_remove(head, tail, element);
249 GNUNET_MESH_tunnel_set_head(*tunnel, head);
250 GNUNET_MESH_tunnel_set_tail(*tunnel, tail);
252 struct GNUNET_MESH_TransmitHandle* th = GNUNET_MESH_notify_transmit_ready (*tunnel,
255 GNUNET_TIME_relative_divide
256 (GNUNET_CONSTANTS_MAX_CORK_DELAY, 2),
257 (const struct GNUNET_PeerIdentity *)
259 send_udp_to_peer_notify_callback, element->cls);
260 /* save the handle */
261 GNUNET_MESH_tunnel_set_data(*tunnel, th);
270 * @brief Handles an UDP-Packet received from the helper.
272 * @param udp A pointer to the Packet
273 * @param dadr The IP-Destination-address
274 * @param addrlen The length of the address
275 * @param version 4 or 6
278 udp_from_helper (struct udp_pkt *udp, unsigned char *dadr, size_t addrlen)
280 struct redirect_info u_i;
281 struct GNUNET_MESH_Tunnel *tunnel;
283 struct GNUNET_MessageHeader *msg;
285 memset (&u_i, 0, sizeof (struct redirect_info));
287 memcpy (&u_i.addr, dadr, addrlen);
291 /* get tunnel and service-descriptor from this */
292 GNUNET_HashCode hash;
293 hash_redirect_info(&hash, &u_i, addrlen);
295 struct redirect_state *state =
296 GNUNET_CONTAINER_multihashmap_get (udp_connections, &hash);
298 /* Mark this connection as freshly used */
299 GNUNET_CONTAINER_heap_update_cost (udp_connections_heap, state->heap_node,
300 GNUNET_TIME_absolute_get ().abs_value);
302 tunnel = state->tunnel;
304 if (state->type == SERVICE)
306 /* check if spt == serv.remote if yes: set spt = serv.myport ("nat") */
307 if (ntohs (udp->spt) == state->serv->remote_port)
309 udp->spt = htons (state->serv->my_port);
313 /* otherwise the answer came from a different port (tftp does this)
314 * add this new port to the list of all services, so that the packets
315 * coming back from the client to this new port will be routed correctly
317 struct redirect_service *serv =
318 GNUNET_malloc (sizeof (struct redirect_service));
319 memcpy (serv, state->serv, sizeof (struct redirect_service));
320 serv->my_port = ntohs (udp->spt);
321 serv->remote_port = ntohs (udp->spt);
322 uint16_t *desc = alloca (sizeof (GNUNET_HashCode) + 2);
323 memcpy ((GNUNET_HashCode *) (desc + 1), &state->desc,
324 sizeof (GNUNET_HashCode));
325 *desc = ntohs (udp->spt);
326 GNUNET_assert (GNUNET_OK ==
327 GNUNET_CONTAINER_multihashmap_put (udp_services,
328 (GNUNET_HashCode*)desc, serv,
329 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
335 /* send udp-packet back */
337 sizeof (struct GNUNET_MessageHeader) + sizeof (GNUNET_HashCode) +
339 struct GNUNET_MESH_Tunnel** ctunnel = GNUNET_malloc (sizeof(struct GNUNET_MESH_TUNNEL*) + len);
341 msg = (struct GNUNET_MessageHeader*)(ctunnel + 1);
342 msg->size = htons (len);
343 msg->type = htons (state->type == SERVICE ? GNUNET_MESSAGE_TYPE_SERVICE_UDP_BACK : GNUNET_MESSAGE_TYPE_REMOTE_UDP_BACK);
344 GNUNET_HashCode *desc = (GNUNET_HashCode *) (msg + 1);
345 if (state->type == SERVICE)
346 memcpy (desc, &state->desc, sizeof (GNUNET_HashCode));
348 memcpy (desc, &state->remote, sizeof (struct remote_addr));
349 void *_udp = desc + 1;
350 memcpy (_udp, udp, ntohs (udp->len));
352 if (NULL == GNUNET_MESH_tunnel_get_data(tunnel))
354 /* No notify is pending */
355 struct GNUNET_MESH_TransmitHandle* th = GNUNET_MESH_notify_transmit_ready (tunnel,
358 GNUNET_TIME_relative_divide
359 (GNUNET_CONSTANTS_MAX_CORK_DELAY, 2),
360 (const struct GNUNET_PeerIdentity *)
362 send_udp_to_peer_notify_callback, ctunnel);
363 /* save the handle */
364 GNUNET_MESH_tunnel_set_data(tunnel, th);
368 struct tunnel_notify_queue* head = GNUNET_MESH_tunnel_get_head(tunnel);
369 struct tunnel_notify_queue* tail = GNUNET_MESH_tunnel_get_tail(tunnel);
371 struct tunnel_notify_queue* element = GNUNET_malloc(sizeof(struct tunnel_notify_queue));
372 element->cls = ctunnel;
375 GNUNET_CONTAINER_DLL_insert_tail(head, tail, element);
376 GNUNET_MESH_tunnel_set_head(tunnel, head);
377 GNUNET_MESH_tunnel_set_tail(tunnel, tail);
382 * @brief Handles a TCP-Packet received from the helper.
384 * @param tcp A pointer to the Packet
385 * @param dadr The IP-Destination-address
386 * @param addrlen The length of the address
387 * @param version 4 or 6
388 * @param pktlen the length of the packet, including its header
391 tcp_from_helper (struct tcp_pkt *tcp, unsigned char *dadr, size_t addrlen,
394 struct redirect_info u_i;
395 struct GNUNET_MESH_Tunnel *tunnel;
397 struct GNUNET_MessageHeader *msg;
399 memset (&u_i, 0, sizeof (struct redirect_info));
401 memcpy (&u_i.addr, dadr, addrlen);
404 /* get tunnel and service-descriptor from this */
405 GNUNET_HashCode hash;
406 hash_redirect_info(&hash, &u_i, addrlen);
408 struct redirect_state *state =
409 GNUNET_CONTAINER_multihashmap_get (tcp_connections, &hash);
413 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "No mapping for this connection; hash is %x\n", *((uint32_t*)&hash));
417 /* Mark this connection as freshly used */
418 GNUNET_CONTAINER_heap_update_cost (tcp_connections_heap, state->heap_node,
419 GNUNET_TIME_absolute_get ().abs_value);
421 tunnel = state->tunnel;
423 if (state->type == SERVICE)
425 /* check if spt == serv.remote if yes: set spt = serv.myport ("nat") */
426 if (ntohs (tcp->spt) == state->serv->remote_port)
428 tcp->spt = htons (state->serv->my_port);
432 // This is an illegal packet.
437 /* send tcp-packet back */
439 sizeof (struct GNUNET_MessageHeader) + sizeof (GNUNET_HashCode) + pktlen;
440 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "len: %d\n", pktlen);
441 struct GNUNET_MESH_Tunnel** ctunnel = GNUNET_malloc (sizeof(struct GNUNET_MESH_TUNNEL*) + len);
443 msg = (struct GNUNET_MessageHeader*)(ctunnel + 1);
444 msg->size = htons (len);
445 msg->type = htons (state->type == SERVICE ? GNUNET_MESSAGE_TYPE_SERVICE_TCP_BACK : GNUNET_MESSAGE_TYPE_REMOTE_TCP_BACK);
446 GNUNET_HashCode *desc = (GNUNET_HashCode *) (msg + 1);
447 if (state->type == SERVICE)
448 memcpy (desc, &state->desc, sizeof (GNUNET_HashCode));
450 memcpy (desc, &state->remote, sizeof (struct remote_addr));
451 void *_tcp = desc + 1;
452 memcpy (_tcp, tcp, pktlen);
454 if (NULL == GNUNET_MESH_tunnel_get_data(tunnel))
456 /* No notify is pending */
457 struct GNUNET_MESH_TransmitHandle* th = GNUNET_MESH_notify_transmit_ready (tunnel,
460 GNUNET_TIME_relative_divide
461 (GNUNET_CONSTANTS_MAX_CORK_DELAY, 2),
462 (const struct GNUNET_PeerIdentity *)NULL,
463 len, send_udp_to_peer_notify_callback,
465 /* save the handle */
466 GNUNET_MESH_tunnel_set_data(tunnel, th);
470 struct tunnel_notify_queue* head = GNUNET_MESH_tunnel_get_head(tunnel);
471 struct tunnel_notify_queue* tail = GNUNET_MESH_tunnel_get_tail(tunnel);
473 struct tunnel_notify_queue* element = GNUNET_malloc(sizeof(struct tunnel_notify_queue));
474 element->cls = ctunnel;
477 GNUNET_CONTAINER_DLL_insert_tail(head, tail, element);
483 * Receive packets from the helper-process
486 message_token (void *cls __attribute__((unused)),
487 void *client __attribute__((unused)), const struct GNUNET_MessageHeader *message)
489 GNUNET_assert (ntohs (message->type) == GNUNET_MESSAGE_TYPE_VPN_HELPER);
491 struct tun_pkt *pkt_tun = (struct tun_pkt *) message;
493 /* ethertype is ipv6 */
494 if (ntohs (pkt_tun->tun.type) == 0x86dd)
496 struct ip6_pkt *pkt6 = (struct ip6_pkt *) pkt_tun;
497 if (0x11 == pkt6->ip6_hdr.nxthdr)
498 udp_from_helper (&((struct ip6_udp *) pkt6)->udp_hdr,
499 (unsigned char *) &pkt6->ip6_hdr.dadr, 16);
500 else if (0x06 == pkt6->ip6_hdr.nxthdr)
501 tcp_from_helper (&((struct ip6_tcp *) pkt6)->tcp_hdr,
502 (unsigned char *) &pkt6->ip6_hdr.dadr, 16,
503 ntohs (pkt6->ip6_hdr.paylgth));
505 else if (ntohs (pkt_tun->tun.type) == 0x0800)
507 struct ip_pkt *pkt4 = (struct ip_pkt *) pkt_tun;
508 uint32_t tmp = pkt4->ip_hdr.dadr;
509 if (0x11 == pkt4->ip_hdr.proto)
510 udp_from_helper (&((struct ip_udp *) pkt4)->udp_hdr,
511 (unsigned char *) &tmp, 4);
512 else if (0x06 == pkt4->ip_hdr.proto)
514 size_t pktlen = ntohs(pkt4->ip_hdr.tot_lngth);
515 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "tot: %d\n", pktlen);
516 pktlen -= 4*pkt4->ip_hdr.hdr_lngth;
517 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "-hdr: %d\n", pktlen);
518 tcp_from_helper (&((struct ip_tcp *) pkt4)->tcp_hdr,
519 (unsigned char *) &tmp, 4, pktlen);
529 * Reads the configuration servicecfg and populates udp_services
532 * @param section name of section in config, equal to hostname
535 read_service_conf (void *cls __attribute__((unused)), const char *section)
537 if ((strlen(section) < 8) || (0 != strcmp (".gnunet.", section + (strlen(section) - 8))))
540 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Parsing dns-name %d %s %s\n", strlen(section), section, section + (strlen(section) - 8));
546 uint16_t *desc = alloca (sizeof (GNUNET_HashCode) + 2);
547 GNUNET_CRYPTO_hash (section, strlen (section) + 1,
548 (GNUNET_HashCode *) (desc + 1));
557 if (proto == UDP && (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string(cfg, section, "UDP_REDIRECTS", &cpy)))
559 else if (proto == TCP && (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string(cfg, section, "TCP_REDIRECTS", &cpy)))
562 for (redirect = strtok (cpy, " "); redirect != NULL; redirect = strtok
565 if (NULL == (hostname = strstr (redirect, ":")))
567 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Warning: option %s is not formatted correctly!\n",
573 if (NULL == (hostport = strstr (hostname, ":")))
575 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Warning: option %s is not formatted correctly!\n",
582 int local_port = atoi (redirect);
583 if (!((local_port > 0) && (local_port < 65536)))
584 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Warning: %s is not a correct port.",
589 struct redirect_service *serv =
590 GNUNET_malloc (sizeof (struct redirect_service));
591 memset (serv, 0, sizeof (struct redirect_service));
592 serv->my_port = local_port;
594 if (0 == strcmp ("localhost4", hostname))
599 GNUNET_assert (GNUNET_OK ==
600 GNUNET_CONFIGURATION_get_value_string (cfg,
605 inet_pton (AF_INET, ip4addr,
606 serv->v4.ip4address));
607 GNUNET_free (ip4addr);
609 else if (0 == strcmp ("localhost6", hostname))
614 GNUNET_assert (GNUNET_OK ==
615 GNUNET_CONFIGURATION_get_value_string (cfg,
620 inet_pton (AF_INET6, ip6addr,
621 serv->v6.ip6address));
622 GNUNET_free (ip6addr);
626 // TODO Lookup, yadayadayada
629 serv->remote_port = atoi (hostport);
631 GNUNET_assert (GNUNET_OK ==
632 GNUNET_CONTAINER_multihashmap_put (udp_services,
633 (GNUNET_HashCode*)desc, serv,
634 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
636 GNUNET_assert (GNUNET_OK ==
637 GNUNET_CONTAINER_multihashmap_put (tcp_services,
638 (GNUNET_HashCode*)desc, serv,
639 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
644 proto = (proto == UDP) ? TCP : UDP;
646 while (proto != UDP);
650 * Start the helper-process
652 * If cls != NULL it is assumed that this function is called as a result of a dying
653 * helper. cls is then taken as handle to the old helper and is cleaned up.
656 start_helper_and_schedule(void *cls,
657 const struct GNUNET_SCHEDULER_TaskContext *tc) {
658 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
671 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string(cfg, "exit", "IFNAME", &ifname))
673 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "No entry 'IFNAME' in configuration!\n");
677 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string(cfg, "exit", "IPV6ADDR", &ipv6addr))
679 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "No entry 'IPV6ADDR' in configuration!\n");
683 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string(cfg, "exit", "IPV6PREFIX", &ipv6prefix))
685 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "No entry 'IPV6PREFIX' in configuration!\n");
689 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string(cfg, "exit", "IPV4ADDR", &ipv4addr))
691 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "No entry 'IPV4ADDR' in configuration!\n");
695 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string(cfg, "exit", "IPV4MASK", &ipv4mask))
697 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "No entry 'IPV4MASK' in configuration!\n");
702 * Messages get passed to the function message_token
703 * When the helper dies, this function will be called again with the
704 * helper_handle as cls.
706 helper_handle = start_helper(ifname,
712 start_helper_and_schedule,
716 GNUNET_free(ipv6addr);
717 GNUNET_free(ipv6prefix);
718 GNUNET_free(ipv4addr);
719 GNUNET_free(ipv4mask);
724 prepare_ipv4_packet (ssize_t len, ssize_t pktlen, void *payload,
725 uint16_t protocol, void *ipaddress, void *tunnel,
726 struct redirect_state *state, struct ip_pkt *pkt4)
730 pkt4->shdr.type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
731 pkt4->shdr.size = htons (len);
733 pkt4->tun.type = htons (0x0800);
735 memcpy (&pkt4->data, payload, pktlen);
737 pkt4->ip_hdr.version = 4;
738 pkt4->ip_hdr.hdr_lngth = 5;
739 pkt4->ip_hdr.diff_serv = 0;
740 pkt4->ip_hdr.tot_lngth = htons (20 + pktlen);
741 pkt4->ip_hdr.ident = 0;
742 pkt4->ip_hdr.flags = 0;
743 pkt4->ip_hdr.frag_off = 0;
744 pkt4->ip_hdr.ttl = 255;
745 pkt4->ip_hdr.proto = protocol;
746 pkt4->ip_hdr.chks = 0; /* Will be calculated later */
748 memcpy (&tmp, ipaddress, 4);
749 pkt4->ip_hdr.dadr = tmp;
751 /* Generate a new src-address */
754 GNUNET_assert (GNUNET_OK ==
755 GNUNET_CONFIGURATION_get_value_string (cfg, "exit",
758 GNUNET_assert (GNUNET_OK ==
759 GNUNET_CONFIGURATION_get_value_string (cfg, "exit",
762 inet_pton (AF_INET, ipv4addr, &tmp);
763 inet_pton (AF_INET, ipv4mask, &tmp2);
764 GNUNET_free (ipv4addr);
765 GNUNET_free (ipv4mask);
767 /* This should be a noop */
770 tmp |= ntohl (*((uint32_t *) tunnel)) & (~tmp2);
772 pkt4->ip_hdr.sadr = tmp;
774 memcpy (&state->redirect_info.addr, &tmp, 4);
775 if (0x11 == protocol)
777 struct ip_udp* pkt4_udp = (struct ip_udp*)pkt4;
778 state->redirect_info.pt = pkt4_udp->udp_hdr.spt;
780 pkt4_udp->udp_hdr.crc = 0; /* Optional for IPv4 */
782 else if (0x06 == protocol)
784 struct ip_tcp* pkt4_tcp = (struct ip_tcp*)pkt4;
785 state->redirect_info.pt = pkt4_tcp->tcp_hdr.spt;
787 pkt4_tcp->tcp_hdr.crc = 0;
789 tmp = pkt4->ip_hdr.sadr;
791 calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
792 tmp = pkt4->ip_hdr.dadr;
794 calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
796 tmp = (protocol << 16) | (0xffff & pktlen);
798 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "line: %08x, %x \n", tmp, (0xffff & pktlen));
802 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
805 calculate_checksum_update (sum, (uint16_t *) & pkt4_tcp->tcp_hdr, pktlen);
806 pkt4_tcp->tcp_hdr.crc = calculate_checksum_end (sum);
810 calculate_ip_checksum ((uint16_t *) & pkt4->ip_hdr, 5 * 4);
814 prepare_ipv6_packet (ssize_t len, ssize_t pktlen, void *payload,
815 uint16_t protocol, void *ipaddress, void *tunnel,
816 struct redirect_state *state, struct ip6_pkt *pkt6)
820 pkt6->shdr.type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
821 pkt6->shdr.size = htons (len);
824 pkt6->tun.type = htons (0x86dd);
826 memcpy (&pkt6->data, payload, pktlen);
828 pkt6->ip6_hdr.version = 6;
829 pkt6->ip6_hdr.nxthdr = protocol;
830 pkt6->ip6_hdr.paylgth = htons (pktlen);
831 pkt6->ip6_hdr.hoplmt = 64;
833 memcpy (pkt6->ip6_hdr.dadr, ipaddress, 16);
835 /* Generate a new src-address
836 * This takes as much from the address of the tunnel as fits into
839 unsigned long long ipv6prefix;
840 GNUNET_assert (GNUNET_OK ==
841 GNUNET_CONFIGURATION_get_value_string (cfg, "exit",
844 GNUNET_assert (GNUNET_OK ==
845 GNUNET_CONFIGURATION_get_value_number (cfg, "exit",
848 GNUNET_assert (ipv6prefix < 127);
849 ipv6prefix = (ipv6prefix + 7) / 8;
851 inet_pton (AF_INET6, ipv6addr, &pkt6->ip6_hdr.sadr);
852 GNUNET_free (ipv6addr);
854 if (ipv6prefix < (16 - sizeof (void *)))
855 ipv6prefix = 16 - sizeof (void *);
857 unsigned int offset = ipv6prefix - (16 - sizeof (void *));
858 memcpy ((((char *) &pkt6->ip6_hdr.sadr)) + ipv6prefix,
859 ((char *) &tunnel) + offset, 16 - ipv6prefix);
861 /* copy the needed information into the state */
862 memcpy (&state->redirect_info.addr, &pkt6->ip6_hdr.sadr, 16);
864 if (0x11 == protocol)
866 struct ip6_udp* pkt6_udp = (struct ip6_udp*)pkt6;
867 state->redirect_info.pt = pkt6_udp->udp_hdr.spt;
869 pkt6_udp->udp_hdr.crc = 0;
872 calculate_checksum_update (sum, (uint16_t *) & pkt6_udp->ip6_hdr.sadr, 16);
874 calculate_checksum_update (sum, (uint16_t *) & pkt6_udp->ip6_hdr.dadr, 16);
875 tmp = (htons (pktlen) & 0xffff);
876 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
877 tmp = htons (((pkt6_udp->ip6_hdr.nxthdr & 0x00ff)));
878 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
881 calculate_checksum_update (sum, (uint16_t *) & pkt6_udp->udp_hdr,
882 ntohs (pkt6_udp->udp_hdr.len));
883 pkt6_udp->udp_hdr.crc = calculate_checksum_end (sum);
885 else if (0x06 == protocol)
887 struct ip6_tcp* pkt6_tcp = (struct ip6_tcp*)pkt6;
888 state->redirect_info.pt = pkt6_tcp->tcp_hdr.spt;
890 pkt6_tcp->tcp_hdr.crc = 0;
893 calculate_checksum_update (sum, (uint16_t *) & pkt6->ip6_hdr.sadr, 16);
895 calculate_checksum_update (sum, (uint16_t *) & pkt6->ip6_hdr.dadr, 16);
897 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
898 tmp = htonl (((pkt6->ip6_hdr.nxthdr & 0x000000ff)));
899 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
902 calculate_checksum_update (sum, (uint16_t *) & pkt6_tcp->tcp_hdr,
903 ntohs (pkt6->ip6_hdr.paylgth));
904 pkt6_tcp->tcp_hdr.crc = calculate_checksum_end (sum);
909 * The messages are one GNUNET_HashCode for the service followed by a struct tcp_pkt
912 receive_tcp_service (void *cls __attribute__((unused)),
913 struct GNUNET_MESH_Tunnel *tunnel,
914 void **tunnel_ctx __attribute__((unused)),
915 const struct GNUNET_PeerIdentity *sender __attribute__((unused)),
916 const struct GNUNET_MessageHeader *message,
917 const struct GNUNET_TRANSPORT_ATS_Information *atsi __attribute__((unused)))
919 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received TCP-Packet\n");
920 GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
921 struct tcp_pkt *pkt = (struct tcp_pkt *) (desc + 1);
922 unsigned int pkt_len = ntohs (message->size) - sizeof (struct
923 GNUNET_MessageHeader)
924 - sizeof (GNUNET_HashCode);
926 /** Get the configuration from the services-hashmap.
928 * Which service is needed only depends on the service-descriptor and the
931 uint16_t *tcp_desc = alloca (sizeof (GNUNET_HashCode) + 2);
933 memcpy (tcp_desc + 1, desc, sizeof (GNUNET_HashCode));
934 *tcp_desc = ntohs (pkt->dpt);
935 struct redirect_service *serv =
936 GNUNET_CONTAINER_multihashmap_get (tcp_services, (GNUNET_HashCode*)tcp_desc);
939 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
940 "No service found for TCP dpt %d!\n", *tcp_desc);
944 pkt->dpt = htons (serv->remote_port);
947 * At this point it would be possible to check against some kind of ACL.
953 /* Prepare the state.
954 * This will be saved in the hashmap, so that the receiving procedure knows
955 * through which tunnel this connection has to be routed.
957 struct redirect_state *state =
958 GNUNET_malloc (sizeof (struct redirect_state));
959 memset (state, 0, sizeof (struct redirect_state));
960 state->tunnel = tunnel;
962 state->type = SERVICE;
963 state->hashmap = tcp_connections;
964 memcpy (&state->desc, desc, sizeof (GNUNET_HashCode));
966 len = sizeof (struct GNUNET_MessageHeader) + sizeof (struct pkt_tun) +
967 sizeof (struct ip6_hdr) + pkt_len;
970 memset (buf, 0, len);
972 switch (serv->version)
975 prepare_ipv4_packet (len, pkt_len, pkt, 0x06, /* TCP */
976 &serv->v4.ip4address,
977 tunnel, state, (struct ip_pkt *) buf);
980 prepare_ipv6_packet (len, pkt_len, pkt, 0x06, /* TCP */
981 &serv->v6.ip6address,
982 tunnel, state, (struct ip6_pkt *) buf);
990 hash_redirect_info(&state->hash, &state->redirect_info, serv->version == 4 ? 4 : 16);
993 GNUNET_CONTAINER_multihashmap_contains (tcp_connections, &state->hash))
995 GNUNET_CONTAINER_multihashmap_put (tcp_connections, &state->hash, state,
996 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
999 GNUNET_CONTAINER_heap_insert (tcp_connections_heap, state,
1000 GNUNET_TIME_absolute_get ().abs_value);
1002 if (GNUNET_CONTAINER_heap_get_size(tcp_connections_heap) > max_tcp_connections)
1003 GNUNET_SCHEDULER_add_now(collect_connections, tcp_connections_heap);
1006 GNUNET_free (state);
1008 (void) GNUNET_DISK_file_write (helper_handle->fh_to_helper, buf, len);
1013 receive_tcp_remote (void *cls __attribute__((unused)),
1014 struct GNUNET_MESH_Tunnel *tunnel,
1015 void **tunnel_ctx __attribute__((unused)),
1016 const struct GNUNET_PeerIdentity *sender __attribute__((unused)),
1017 const struct GNUNET_MessageHeader *message,
1018 const struct GNUNET_TRANSPORT_ATS_Information *atsi __attribute__((unused)))
1020 GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
1021 struct tcp_pkt *pkt = (struct tcp_pkt *) (desc + 1);
1022 struct remote_addr *s = (struct remote_addr *) desc;
1025 unsigned int pkt_len = ntohs (message->size) - sizeof (struct GNUNET_MessageHeader) - sizeof (GNUNET_HashCode);
1027 struct redirect_state *state =
1028 GNUNET_malloc (sizeof (struct redirect_state));
1029 memset (state, 0, sizeof (struct redirect_state));
1030 state->tunnel = tunnel;
1031 state->type = REMOTE;
1032 state->hashmap = tcp_connections;
1033 memcpy (&state->remote, s, sizeof (struct remote_addr));
1035 len = sizeof (struct GNUNET_MessageHeader) + sizeof (struct pkt_tun) +
1036 sizeof (struct ip6_hdr) + pkt_len;
1039 memset (buf, 0, len);
1044 prepare_ipv4_packet (len, pkt_len, pkt, 0x06, /* TCP */
1045 &s->addr, tunnel, state, (struct ip_pkt *) buf);
1048 prepare_ipv6_packet (len, pkt_len, pkt, 0x06, /* TCP */
1049 &s->addr, tunnel, state, (struct ip6_pkt *) buf);
1056 hash_redirect_info (&state->hash, &state->redirect_info, s->addrlen);
1058 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Packet from remote; hash is %x\n", *((uint32_t*)&state->hash));
1061 GNUNET_CONTAINER_multihashmap_contains (tcp_connections, &state->hash))
1063 GNUNET_CONTAINER_multihashmap_put (tcp_connections, &state->hash, state,
1064 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1067 GNUNET_CONTAINER_heap_insert (tcp_connections_heap, state,
1068 GNUNET_TIME_absolute_get ().abs_value);
1070 if (GNUNET_CONTAINER_heap_get_size (tcp_connections_heap) >
1071 max_tcp_connections)
1072 GNUNET_SCHEDULER_add_now (collect_connections, tcp_connections_heap);
1075 GNUNET_free (state);
1077 (void) GNUNET_DISK_file_write (helper_handle->fh_to_helper, buf, len);
1083 receive_udp_remote (void *cls __attribute__((unused)),
1084 struct GNUNET_MESH_Tunnel *tunnel,
1085 void **tunnel_ctx __attribute__((unused)),
1086 const struct GNUNET_PeerIdentity *sender __attribute__((unused)),
1087 const struct GNUNET_MessageHeader *message,
1088 const struct GNUNET_TRANSPORT_ATS_Information *atsi __attribute__((unused)))
1090 GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
1091 struct udp_pkt *pkt = (struct udp_pkt *) (desc + 1);
1092 struct remote_addr *s = (struct remote_addr *) desc;
1096 GNUNET_assert (ntohs (pkt->len) ==
1097 ntohs (message->size) -
1098 sizeof (struct GNUNET_MessageHeader) -
1099 sizeof (GNUNET_HashCode));
1101 /* Prepare the state.
1102 * This will be saved in the hashmap, so that the receiving procedure knows
1103 * through which tunnel this connection has to be routed.
1105 struct redirect_state *state =
1106 GNUNET_malloc (sizeof (struct redirect_state));
1107 memset (state, 0, sizeof (struct redirect_state));
1108 state->tunnel = tunnel;
1109 state->hashmap = udp_connections;
1110 state->type = REMOTE;
1111 memcpy (&state->remote, s, sizeof (struct remote_addr));
1113 len = sizeof (struct GNUNET_MessageHeader) + sizeof (struct pkt_tun) +
1114 sizeof (struct ip6_hdr) + ntohs (pkt->len);
1117 memset (buf, 0, len);
1122 prepare_ipv4_packet (len, ntohs (pkt->len), pkt, 0x11, /* UDP */
1123 &s->addr, tunnel, state, (struct ip_pkt *) buf);
1126 prepare_ipv6_packet (len, ntohs (pkt->len), pkt, 0x11, /* UDP */
1127 &s->addr, tunnel, state, (struct ip6_pkt *) buf);
1134 hash_redirect_info (&state->hash, &state->redirect_info, s->addrlen);
1137 GNUNET_CONTAINER_multihashmap_contains (udp_connections, &state->hash))
1139 GNUNET_CONTAINER_multihashmap_put (udp_connections, &state->hash, state,
1140 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1143 GNUNET_CONTAINER_heap_insert (udp_connections_heap, state,
1144 GNUNET_TIME_absolute_get ().abs_value);
1146 if (GNUNET_CONTAINER_heap_get_size (udp_connections_heap) >
1147 max_udp_connections)
1148 GNUNET_SCHEDULER_add_now (collect_connections, udp_connections_heap);
1151 GNUNET_free (state);
1153 (void) GNUNET_DISK_file_write (helper_handle->fh_to_helper, buf, len);
1158 * The messages are one GNUNET_HashCode for the service, followed by a struct udp_pkt
1161 receive_udp_service (void *cls __attribute__((unused)),
1162 struct GNUNET_MESH_Tunnel *tunnel,
1163 void **tunnel_ctx __attribute__((unused)),
1164 const struct GNUNET_PeerIdentity *sender __attribute__((unused)),
1165 const struct GNUNET_MessageHeader *message,
1166 const struct GNUNET_TRANSPORT_ATS_Information *atsi __attribute__((unused)))
1168 GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
1169 struct udp_pkt *pkt = (struct udp_pkt *) (desc + 1);
1171 GNUNET_assert (ntohs (pkt->len) ==
1172 ntohs (message->size) -
1173 sizeof (struct GNUNET_MessageHeader) -
1174 sizeof (GNUNET_HashCode));
1176 /* Get the configuration from the hashmap */
1177 uint16_t *udp_desc = alloca (sizeof (GNUNET_HashCode) + 2);
1178 memcpy (udp_desc + 1, desc, sizeof (GNUNET_HashCode));
1179 *udp_desc = ntohs (pkt->dpt);
1180 struct redirect_service *serv =
1181 GNUNET_CONTAINER_multihashmap_get (udp_services, (GNUNET_HashCode*)udp_desc);
1184 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1185 "No service found for UDP dpt %d!\n", *udp_desc);
1189 pkt->dpt = htons (serv->remote_port);
1192 * At this point it would be possible to check against some kind of ACL.
1198 /* Prepare the state.
1199 * This will be saved in the hashmap, so that the receiving procedure knows
1200 * through which tunnel this connection has to be routed.
1202 struct redirect_state *state =
1203 GNUNET_malloc (sizeof (struct redirect_state));
1204 memset (state, 0, sizeof (struct redirect_state));
1205 state->tunnel = tunnel;
1207 state->type = SERVICE;
1208 state->hashmap = udp_connections;
1209 memcpy (&state->desc, desc, sizeof (GNUNET_HashCode));
1211 len = sizeof (struct GNUNET_MessageHeader) + sizeof (struct pkt_tun) +
1212 sizeof (struct ip6_hdr) + ntohs (pkt->len);
1215 memset (buf, 0, len);
1217 switch (serv->version)
1220 prepare_ipv4_packet (len, ntohs (pkt->len), pkt, 0x11, /* UDP */
1221 &serv->v4.ip4address,
1222 tunnel, state, (struct ip_pkt *) buf);
1225 prepare_ipv6_packet (len, ntohs (pkt->len), pkt, 0x11, /* UDP */
1226 &serv->v6.ip6address,
1227 tunnel, state, (struct ip6_pkt *) buf);
1235 hash_redirect_info(&state->hash, &state->redirect_info, serv->version == 4 ? 4 : 16);
1238 GNUNET_CONTAINER_multihashmap_contains (udp_connections, &state->hash))
1240 GNUNET_CONTAINER_multihashmap_put (udp_connections, &state->hash, state,
1241 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1244 GNUNET_CONTAINER_heap_insert (udp_connections_heap, state,
1245 GNUNET_TIME_absolute_get ().abs_value);
1247 if (GNUNET_CONTAINER_heap_get_size(udp_connections_heap) > max_udp_connections)
1248 GNUNET_SCHEDULER_add_now(collect_connections, udp_connections_heap);
1251 GNUNET_free (state);
1253 (void) GNUNET_DISK_file_write (helper_handle->fh_to_helper, buf, len);
1261 int handler_idx, app_idx;
1263 udp = GNUNET_CONFIGURATION_get_value_yesno(cfg, "exit", "ENABLE_UDP");
1264 tcp = GNUNET_CONFIGURATION_get_value_yesno(cfg, "exit", "ENABLE_TCP");
1266 static struct GNUNET_MESH_MessageHandler handlers[] = {
1267 {receive_udp_service, GNUNET_MESSAGE_TYPE_SERVICE_UDP, 0},
1268 {receive_tcp_service, GNUNET_MESSAGE_TYPE_SERVICE_TCP, 0},
1274 static GNUNET_MESH_ApplicationType apptypes[] =
1276 GNUNET_APPLICATION_TYPE_END,
1277 GNUNET_APPLICATION_TYPE_END,
1278 GNUNET_APPLICATION_TYPE_END
1284 if (GNUNET_YES == udp)
1286 handlers[handler_idx].callback = receive_udp_remote;
1287 handlers[handler_idx].expected_size = 0;
1288 handlers[handler_idx].type = GNUNET_MESSAGE_TYPE_REMOTE_UDP;
1289 apptypes[app_idx] = GNUNET_APPLICATION_TYPE_INTERNET_UDP_GATEWAY;
1294 if (GNUNET_YES == tcp)
1296 handlers[handler_idx].callback = receive_tcp_remote;
1297 handlers[handler_idx].expected_size = 0;
1298 handlers[handler_idx].type = GNUNET_MESSAGE_TYPE_REMOTE_TCP;
1299 apptypes[app_idx] = GNUNET_APPLICATION_TYPE_INTERNET_TCP_GATEWAY;
1304 mesh_handle = GNUNET_MESH_connect (cfg, NULL, NULL, handlers, apptypes);
1308 * @brief Main function that will be run by the scheduler.
1310 * @param cls closure
1311 * @param args remaining command-line arguments
1312 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
1313 * @param cfg_ configuration
1317 char *const *args __attribute__((unused)),
1318 const char *cfgfile __attribute__((unused)), const struct GNUNET_CONFIGURATION_Handle *cfg_)
1324 udp_connections = GNUNET_CONTAINER_multihashmap_create (65536);
1325 udp_connections_heap =
1326 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1327 tcp_connections = GNUNET_CONTAINER_multihashmap_create (65536);
1328 tcp_connections_heap =
1329 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1330 udp_services = GNUNET_CONTAINER_multihashmap_create (65536);
1331 tcp_services = GNUNET_CONTAINER_multihashmap_create (65536);
1333 GNUNET_CONFIGURATION_get_value_number (cfg, "exit", "MAX_UDP_CONNECTIONS",
1334 &max_udp_connections);
1335 GNUNET_CONFIGURATION_get_value_number (cfg, "exit", "MAX_TCP_CONNECTIONS",
1336 &max_tcp_connections);
1338 GNUNET_CONFIGURATION_iterate_sections (cfg, read_service_conf, NULL);
1340 GNUNET_SCHEDULER_add_now (start_helper_and_schedule, NULL);
1341 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &cleanup, cls);
1345 * The main function to obtain template from gnunetd.
1347 * @param argc number of arguments from the command line
1348 * @param argv command line arguments
1349 * @return 0 ok, 1 on error
1352 main (int argc, char *const *argv) {
1353 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
1354 GNUNET_GETOPT_OPTION_END
1357 return (GNUNET_OK ==
1358 GNUNET_PROGRAM_run (argc,
1361 gettext_noop ("help text"),
1362 options, &run, NULL)) ? ret : 1;
1365 /* end of gnunet-daemon-exit.c */