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);
242 if (NULL != GNUNET_MESH_tunnel_get_head(*tunnel))
244 struct tunnel_notify_queue* element = GNUNET_MESH_tunnel_get_head(*tunnel);
245 struct tunnel_notify_queue* head = GNUNET_MESH_tunnel_get_head(*tunnel);
246 struct tunnel_notify_queue* tail = GNUNET_MESH_tunnel_get_tail(*tunnel);
248 GNUNET_CONTAINER_DLL_remove(head, tail, element);
250 GNUNET_MESH_tunnel_set_head(*tunnel, head);
251 GNUNET_MESH_tunnel_set_tail(*tunnel, tail);
253 struct GNUNET_MESH_TransmitHandle* th = GNUNET_MESH_notify_transmit_ready (*tunnel,
256 GNUNET_TIME_relative_divide
257 (GNUNET_CONSTANTS_MAX_CORK_DELAY, 2),
258 (const struct GNUNET_PeerIdentity *)
260 send_udp_to_peer_notify_callback, element->cls);
261 /* save the handle */
262 GNUNET_MESH_tunnel_set_data(*tunnel, th);
269 * @brief Handles an UDP-Packet received from the helper.
271 * @param udp A pointer to the Packet
272 * @param dadr The IP-Destination-address
273 * @param addrlen The length of the address
274 * @param version 4 or 6
277 udp_from_helper (struct udp_pkt *udp, unsigned char *dadr, size_t addrlen)
279 struct redirect_info u_i;
280 struct GNUNET_MESH_Tunnel *tunnel;
282 struct GNUNET_MessageHeader *msg;
284 memset (&u_i, 0, sizeof (struct redirect_info));
286 memcpy (&u_i.addr, dadr, addrlen);
290 /* get tunnel and service-descriptor from this */
291 GNUNET_HashCode hash;
292 hash_redirect_info(&hash, &u_i, addrlen);
294 struct redirect_state *state =
295 GNUNET_CONTAINER_multihashmap_get (udp_connections, &hash);
297 /* Mark this connection as freshly used */
298 GNUNET_CONTAINER_heap_update_cost (udp_connections_heap, state->heap_node,
299 GNUNET_TIME_absolute_get ().abs_value);
301 tunnel = state->tunnel;
303 if (state->type == SERVICE)
305 /* check if spt == serv.remote if yes: set spt = serv.myport ("nat") */
306 if (ntohs (udp->spt) == state->serv->remote_port)
308 udp->spt = htons (state->serv->my_port);
312 /* otherwise the answer came from a different port (tftp does this)
313 * add this new port to the list of all services, so that the packets
314 * coming back from the client to this new port will be routed correctly
316 struct redirect_service *serv =
317 GNUNET_malloc (sizeof (struct redirect_service));
318 memcpy (serv, state->serv, sizeof (struct redirect_service));
319 serv->my_port = ntohs (udp->spt);
320 serv->remote_port = ntohs (udp->spt);
321 uint16_t *desc = alloca (sizeof (GNUNET_HashCode) + 2);
322 memcpy ((GNUNET_HashCode *) (desc + 1), &state->desc,
323 sizeof (GNUNET_HashCode));
324 *desc = ntohs (udp->spt);
325 GNUNET_assert (GNUNET_OK ==
326 GNUNET_CONTAINER_multihashmap_put (udp_services,
327 (GNUNET_HashCode*)desc, serv,
328 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
334 /* send udp-packet back */
336 sizeof (struct GNUNET_MessageHeader) + sizeof (GNUNET_HashCode) +
338 struct GNUNET_MESH_Tunnel** ctunnel = GNUNET_malloc (sizeof(struct GNUNET_MESH_TUNNEL*) + len);
340 msg = (struct GNUNET_MessageHeader*)(ctunnel + 1);
341 msg->size = htons (len);
342 msg->type = htons (state->type == SERVICE ? GNUNET_MESSAGE_TYPE_SERVICE_UDP_BACK : GNUNET_MESSAGE_TYPE_REMOTE_UDP_BACK);
343 GNUNET_HashCode *desc = (GNUNET_HashCode *) (msg + 1);
344 if (state->type == SERVICE)
345 memcpy (desc, &state->desc, sizeof (GNUNET_HashCode));
347 memcpy (desc, &state->remote, sizeof (struct remote_addr));
348 void *_udp = desc + 1;
349 memcpy (_udp, udp, ntohs (udp->len));
351 if (NULL == GNUNET_MESH_tunnel_get_data(tunnel))
353 /* No notify is pending */
354 struct GNUNET_MESH_TransmitHandle* th = GNUNET_MESH_notify_transmit_ready (tunnel,
357 GNUNET_TIME_relative_divide
358 (GNUNET_CONSTANTS_MAX_CORK_DELAY, 2),
359 (const struct GNUNET_PeerIdentity *)
361 send_udp_to_peer_notify_callback, ctunnel);
362 /* save the handle */
363 GNUNET_MESH_tunnel_set_data(tunnel, th);
367 struct tunnel_notify_queue* head = GNUNET_MESH_tunnel_get_head(tunnel);
368 struct tunnel_notify_queue* tail = GNUNET_MESH_tunnel_get_tail(tunnel);
370 struct tunnel_notify_queue* element = GNUNET_malloc(sizeof(struct tunnel_notify_queue));
371 element->cls = ctunnel;
374 GNUNET_CONTAINER_DLL_insert_tail(head, tail, element);
375 GNUNET_MESH_tunnel_set_head(tunnel, head);
376 GNUNET_MESH_tunnel_set_tail(tunnel, tail);
381 * @brief Handles a TCP-Packet received from the helper.
383 * @param tcp A pointer to the Packet
384 * @param dadr The IP-Destination-address
385 * @param addrlen The length of the address
386 * @param version 4 or 6
387 * @param pktlen the length of the packet, including its header
390 tcp_from_helper (struct tcp_pkt *tcp, unsigned char *dadr, size_t addrlen,
393 struct redirect_info u_i;
394 struct GNUNET_MESH_Tunnel *tunnel;
396 struct GNUNET_MessageHeader *msg;
398 memset (&u_i, 0, sizeof (struct redirect_info));
400 memcpy (&u_i.addr, dadr, addrlen);
403 /* get tunnel and service-descriptor from this */
404 GNUNET_HashCode hash;
405 hash_redirect_info(&hash, &u_i, addrlen);
407 struct redirect_state *state =
408 GNUNET_CONTAINER_multihashmap_get (tcp_connections, &hash);
410 if (state == NULL) return;
412 /* Mark this connection as freshly used */
413 GNUNET_CONTAINER_heap_update_cost (tcp_connections_heap, state->heap_node,
414 GNUNET_TIME_absolute_get ().abs_value);
416 tunnel = state->tunnel;
418 if (state->type == SERVICE)
420 /* check if spt == serv.remote if yes: set spt = serv.myport ("nat") */
421 if (ntohs (tcp->spt) == state->serv->remote_port)
423 tcp->spt = htons (state->serv->my_port);
427 // This is an illegal packet.
432 /* send tcp-packet back */
434 sizeof (struct GNUNET_MessageHeader) + sizeof (GNUNET_HashCode) + pktlen;
435 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "len: %d\n", pktlen);
436 struct GNUNET_MESH_Tunnel** ctunnel = GNUNET_malloc (sizeof(struct GNUNET_MESH_TUNNEL*) + len);
438 msg = (struct GNUNET_MessageHeader*)(ctunnel + 1);
439 msg->size = htons (len);
440 msg->type = htons (state->type == SERVICE ? GNUNET_MESSAGE_TYPE_SERVICE_TCP_BACK : GNUNET_MESSAGE_TYPE_REMOTE_TCP_BACK);
441 GNUNET_HashCode *desc = (GNUNET_HashCode *) (msg + 1);
442 if (state->type == SERVICE)
443 memcpy (desc, &state->desc, sizeof (GNUNET_HashCode));
445 memcpy (desc, &state->remote, sizeof (struct remote_addr));
446 void *_tcp = desc + 1;
447 memcpy (_tcp, tcp, pktlen);
449 if (NULL == GNUNET_MESH_tunnel_get_data(tunnel))
451 /* No notify is pending */
452 struct GNUNET_MESH_TransmitHandle* th = GNUNET_MESH_notify_transmit_ready (tunnel,
455 GNUNET_TIME_relative_divide
456 (GNUNET_CONSTANTS_MAX_CORK_DELAY, 2),
457 (const struct GNUNET_PeerIdentity *)NULL,
458 len, send_udp_to_peer_notify_callback,
460 /* save the handle */
461 GNUNET_MESH_tunnel_set_data(tunnel, th);
465 struct tunnel_notify_queue* head = GNUNET_MESH_tunnel_get_head(tunnel);
466 struct tunnel_notify_queue* tail = GNUNET_MESH_tunnel_get_tail(tunnel);
468 struct tunnel_notify_queue* element = GNUNET_malloc(sizeof(struct tunnel_notify_queue));
469 element->cls = ctunnel;
472 GNUNET_CONTAINER_DLL_insert_tail(head, tail, element);
478 * Receive packets from the helper-process
481 message_token (void *cls __attribute__((unused)),
482 void *client __attribute__((unused)), const struct GNUNET_MessageHeader *message)
484 GNUNET_assert (ntohs (message->type) == GNUNET_MESSAGE_TYPE_VPN_HELPER);
486 struct tun_pkt *pkt_tun = (struct tun_pkt *) message;
488 /* ethertype is ipv6 */
489 if (ntohs (pkt_tun->tun.type) == 0x86dd)
491 struct ip6_pkt *pkt6 = (struct ip6_pkt *) pkt_tun;
492 if (0x11 == pkt6->ip6_hdr.nxthdr)
493 udp_from_helper (&((struct ip6_udp *) pkt6)->udp_hdr,
494 (unsigned char *) &pkt6->ip6_hdr.dadr, 16);
495 else if (0x06 == pkt6->ip6_hdr.nxthdr)
496 tcp_from_helper (&((struct ip6_tcp *) pkt6)->tcp_hdr,
497 (unsigned char *) &pkt6->ip6_hdr.dadr, 16,
498 ntohs (pkt6->ip6_hdr.paylgth));
500 else if (ntohs (pkt_tun->tun.type) == 0x0800)
502 struct ip_pkt *pkt4 = (struct ip_pkt *) pkt_tun;
503 uint32_t tmp = pkt4->ip_hdr.dadr;
504 if (0x11 == pkt4->ip_hdr.proto)
505 udp_from_helper (&((struct ip_udp *) pkt4)->udp_hdr,
506 (unsigned char *) &tmp, 4);
507 else if (0x06 == pkt4->ip_hdr.proto)
509 size_t pktlen = ntohs(pkt4->ip_hdr.tot_lngth);
510 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "tot: %d\n", pktlen);
511 pktlen -= 4*pkt4->ip_hdr.hdr_lngth;
512 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "-hdr: %d\n", pktlen);
513 tcp_from_helper (&((struct ip_tcp *) pkt4)->tcp_hdr,
514 (unsigned char *) &tmp, 4, pktlen);
524 * Reads the configuration servicecfg and populates udp_services
527 * @param section name of section in config, equal to hostname
530 read_service_conf (void *cls __attribute__((unused)), const char *section)
532 if ((strlen(section) < 8) || (0 != strcmp (".gnunet.", section + (strlen(section) - 8))))
535 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Parsing dns-name %d %s %s\n", strlen(section), section, section + (strlen(section) - 8));
541 uint16_t *desc = alloca (sizeof (GNUNET_HashCode) + 2);
542 GNUNET_CRYPTO_hash (section, strlen (section) + 1,
543 (GNUNET_HashCode *) (desc + 1));
552 if (proto == UDP && (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string(cfg, section, "UDP_REDIRECTS", &cpy)))
554 else if (proto == TCP && (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string(cfg, section, "TCP_REDIRECTS", &cpy)))
557 for (redirect = strtok (cpy, " "); redirect != NULL; redirect = strtok
560 if (NULL == (hostname = strstr (redirect, ":")))
562 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Warning: option %s is not formatted correctly!\n",
568 if (NULL == (hostport = strstr (hostname, ":")))
570 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Warning: option %s is not formatted correctly!\n",
577 int local_port = atoi (redirect);
578 if (!((local_port > 0) && (local_port < 65536)))
579 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Warning: %s is not a correct port.",
584 struct redirect_service *serv =
585 GNUNET_malloc (sizeof (struct redirect_service));
586 memset (serv, 0, sizeof (struct redirect_service));
587 serv->my_port = local_port;
589 if (0 == strcmp ("localhost4", hostname))
594 GNUNET_assert (GNUNET_OK ==
595 GNUNET_CONFIGURATION_get_value_string (cfg,
600 inet_pton (AF_INET, ip4addr,
601 serv->v4.ip4address));
602 GNUNET_free (ip4addr);
604 else if (0 == strcmp ("localhost6", hostname))
609 GNUNET_assert (GNUNET_OK ==
610 GNUNET_CONFIGURATION_get_value_string (cfg,
615 inet_pton (AF_INET6, ip6addr,
616 serv->v6.ip6address));
617 GNUNET_free (ip6addr);
621 // TODO Lookup, yadayadayada
624 serv->remote_port = atoi (hostport);
626 GNUNET_assert (GNUNET_OK ==
627 GNUNET_CONTAINER_multihashmap_put (udp_services,
628 (GNUNET_HashCode*)desc, serv,
629 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
631 GNUNET_assert (GNUNET_OK ==
632 GNUNET_CONTAINER_multihashmap_put (tcp_services,
633 (GNUNET_HashCode*)desc, serv,
634 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
639 proto = (proto == UDP) ? TCP : UDP;
641 while (proto != UDP);
645 * Start the helper-process
647 * If cls != NULL it is assumed that this function is called as a result of a dying
648 * helper. cls is then taken as handle to the old helper and is cleaned up.
651 start_helper_and_schedule(void *cls,
652 const struct GNUNET_SCHEDULER_TaskContext *tc) {
653 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
666 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string(cfg, "exit", "IFNAME", &ifname))
668 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "No entry 'IFNAME' in configuration!\n");
672 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string(cfg, "exit", "IPV6ADDR", &ipv6addr))
674 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "No entry 'IPV6ADDR' in configuration!\n");
678 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string(cfg, "exit", "IPV6PREFIX", &ipv6prefix))
680 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "No entry 'IPV6PREFIX' in configuration!\n");
684 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string(cfg, "exit", "IPV4ADDR", &ipv4addr))
686 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "No entry 'IPV4ADDR' in configuration!\n");
690 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string(cfg, "exit", "IPV4MASK", &ipv4mask))
692 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "No entry 'IPV4MASK' in configuration!\n");
697 * Messages get passed to the function message_token
698 * When the helper dies, this function will be called again with the
699 * helper_handle as cls.
701 helper_handle = start_helper(ifname,
707 start_helper_and_schedule,
711 GNUNET_free(ipv6addr);
712 GNUNET_free(ipv6prefix);
713 GNUNET_free(ipv4addr);
714 GNUNET_free(ipv4mask);
719 prepare_ipv4_packet (ssize_t len, ssize_t pktlen, void *payload,
720 uint16_t protocol, void *ipaddress, void *tunnel,
721 struct redirect_state *state, struct ip_pkt *pkt4)
725 pkt4->shdr.type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
726 pkt4->shdr.size = htons (len);
728 pkt4->tun.type = htons (0x0800);
730 memcpy (&pkt4->data, payload, pktlen);
732 pkt4->ip_hdr.version = 4;
733 pkt4->ip_hdr.hdr_lngth = 5;
734 pkt4->ip_hdr.diff_serv = 0;
735 pkt4->ip_hdr.tot_lngth = htons (20 + pktlen);
736 pkt4->ip_hdr.ident = 0;
737 pkt4->ip_hdr.flags = 0;
738 pkt4->ip_hdr.frag_off = 0;
739 pkt4->ip_hdr.ttl = 255;
740 pkt4->ip_hdr.proto = protocol;
741 pkt4->ip_hdr.chks = 0; /* Will be calculated later */
743 memcpy (&tmp, ipaddress, 4);
744 pkt4->ip_hdr.dadr = tmp;
746 /* Generate a new src-address */
749 GNUNET_assert (GNUNET_OK ==
750 GNUNET_CONFIGURATION_get_value_string (cfg, "exit",
753 GNUNET_assert (GNUNET_OK ==
754 GNUNET_CONFIGURATION_get_value_string (cfg, "exit",
757 inet_pton (AF_INET, ipv4addr, &tmp);
758 inet_pton (AF_INET, ipv4mask, &tmp2);
759 GNUNET_free (ipv4addr);
760 GNUNET_free (ipv4mask);
762 /* This should be a noop */
765 tmp |= ntohl (*((uint32_t *) tunnel)) & (~tmp2);
767 pkt4->ip_hdr.sadr = tmp;
769 memcpy (&state->redirect_info.addr, &tmp, 4);
770 if (0x11 == protocol)
772 struct ip_udp* pkt4_udp = (struct ip_udp*)pkt4;
773 state->redirect_info.pt = pkt4_udp->udp_hdr.spt;
775 pkt4_udp->udp_hdr.crc = 0; /* Optional for IPv4 */
777 else if (0x06 == protocol)
779 struct ip_tcp* pkt4_tcp = (struct ip_tcp*)pkt4;
780 state->redirect_info.pt = pkt4_tcp->tcp_hdr.spt;
782 pkt4_tcp->tcp_hdr.crc = 0;
784 tmp = pkt4->ip_hdr.sadr;
786 calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
787 tmp = pkt4->ip_hdr.dadr;
789 calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
791 tmp = (protocol << 16) | (0xffff & pktlen);
793 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "line: %08x, %x \n", tmp, (0xffff & pktlen));
797 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
800 calculate_checksum_update (sum, (uint16_t *) & pkt4_tcp->tcp_hdr, pktlen);
801 pkt4_tcp->tcp_hdr.crc = calculate_checksum_end (sum);
805 calculate_ip_checksum ((uint16_t *) & pkt4->ip_hdr, 5 * 4);
809 prepare_ipv6_packet (ssize_t len, ssize_t pktlen, void *payload,
810 uint16_t protocol, void *ipaddress, void *tunnel,
811 struct redirect_state *state, struct ip6_pkt *pkt6)
815 pkt6->shdr.type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
816 pkt6->shdr.size = htons (len);
819 pkt6->tun.type = htons (0x86dd);
821 memcpy (&pkt6->data, payload, pktlen);
823 pkt6->ip6_hdr.version = 6;
824 pkt6->ip6_hdr.nxthdr = protocol;
825 pkt6->ip6_hdr.paylgth = htons (pktlen);
826 pkt6->ip6_hdr.hoplmt = 64;
828 memcpy (pkt6->ip6_hdr.dadr, ipaddress, 16);
830 /* Generate a new src-address
831 * This takes as much from the address of the tunnel as fits into
834 unsigned long long ipv6prefix;
835 GNUNET_assert (GNUNET_OK ==
836 GNUNET_CONFIGURATION_get_value_string (cfg, "exit",
839 GNUNET_assert (GNUNET_OK ==
840 GNUNET_CONFIGURATION_get_value_number (cfg, "exit",
843 GNUNET_assert (ipv6prefix < 127);
844 ipv6prefix = (ipv6prefix + 7) / 8;
846 inet_pton (AF_INET6, ipv6addr, &pkt6->ip6_hdr.sadr);
847 GNUNET_free (ipv6addr);
849 if (ipv6prefix < (16 - sizeof (void *)))
850 ipv6prefix = 16 - sizeof (void *);
852 unsigned int offset = ipv6prefix - (16 - sizeof (void *));
853 memcpy ((((char *) &pkt6->ip6_hdr.sadr)) + ipv6prefix,
854 ((char *) &tunnel) + offset, 16 - ipv6prefix);
856 /* copy the needed information into the state */
857 memcpy (&state->redirect_info.addr, &pkt6->ip6_hdr.sadr, 16);
859 if (0x11 == protocol)
861 struct ip6_udp* pkt6_udp = (struct ip6_udp*)pkt6;
862 state->redirect_info.pt = pkt6_udp->udp_hdr.spt;
864 pkt6_udp->udp_hdr.crc = 0;
867 calculate_checksum_update (sum, (uint16_t *) & pkt6_udp->ip6_hdr.sadr, 16);
869 calculate_checksum_update (sum, (uint16_t *) & pkt6_udp->ip6_hdr.dadr, 16);
870 tmp = (htons (pktlen) & 0xffff);
871 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
872 tmp = htons (((pkt6_udp->ip6_hdr.nxthdr & 0x00ff)));
873 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
876 calculate_checksum_update (sum, (uint16_t *) & pkt6_udp->udp_hdr,
877 ntohs (pkt6_udp->udp_hdr.len));
878 pkt6_udp->udp_hdr.crc = calculate_checksum_end (sum);
880 else if (0x06 == protocol)
882 struct ip6_tcp* pkt6_tcp = (struct ip6_tcp*)pkt6;
883 state->redirect_info.pt = pkt6_tcp->tcp_hdr.spt;
885 pkt6_tcp->tcp_hdr.crc = 0;
888 calculate_checksum_update (sum, (uint16_t *) & pkt6->ip6_hdr.sadr, 16);
890 calculate_checksum_update (sum, (uint16_t *) & pkt6->ip6_hdr.dadr, 16);
892 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
893 tmp = htonl (((pkt6->ip6_hdr.nxthdr & 0x000000ff)));
894 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
897 calculate_checksum_update (sum, (uint16_t *) & pkt6_tcp->tcp_hdr,
898 ntohs (pkt6->ip6_hdr.paylgth));
899 pkt6_tcp->tcp_hdr.crc = calculate_checksum_end (sum);
904 * The messages are one GNUNET_HashCode for the service followed by a struct tcp_pkt
907 receive_tcp_service (void *cls __attribute__((unused)),
908 struct GNUNET_MESH_Tunnel *tunnel,
909 void **tunnel_ctx __attribute__((unused)),
910 const struct GNUNET_PeerIdentity *sender __attribute__((unused)),
911 const struct GNUNET_MessageHeader *message,
912 const struct GNUNET_TRANSPORT_ATS_Information *atsi __attribute__((unused)))
914 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received TCP-Packet\n");
915 GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
916 struct tcp_pkt *pkt = (struct tcp_pkt *) (desc + 1);
917 unsigned int pkt_len = ntohs (message->size) - sizeof (struct
918 GNUNET_MessageHeader)
919 - sizeof (GNUNET_HashCode);
921 /** Get the configuration from the services-hashmap.
923 * Which service is needed only depends on the service-descriptor and the
926 uint16_t *tcp_desc = alloca (sizeof (GNUNET_HashCode) + 2);
928 memcpy (tcp_desc + 1, desc, sizeof (GNUNET_HashCode));
929 *tcp_desc = ntohs (pkt->dpt);
930 struct redirect_service *serv =
931 GNUNET_CONTAINER_multihashmap_get (tcp_services, (GNUNET_HashCode*)tcp_desc);
934 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
935 "No service found for TCP dpt %d!\n", *tcp_desc);
939 pkt->dpt = htons (serv->remote_port);
942 * At this point it would be possible to check against some kind of ACL.
948 /* Prepare the state.
949 * This will be saved in the hashmap, so that the receiving procedure knows
950 * through which tunnel this connection has to be routed.
952 struct redirect_state *state =
953 GNUNET_malloc (sizeof (struct redirect_state));
954 memset (state, 0, sizeof (struct redirect_state));
955 state->tunnel = tunnel;
957 state->type = SERVICE;
958 state->hashmap = tcp_connections;
959 memcpy (&state->desc, desc, sizeof (GNUNET_HashCode));
961 len = sizeof (struct GNUNET_MessageHeader) + sizeof (struct pkt_tun) +
962 sizeof (struct ip6_hdr) + pkt_len;
965 memset (buf, 0, len);
967 switch (serv->version)
970 prepare_ipv4_packet (len, pkt_len, pkt, 0x06, /* TCP */
971 &serv->v4.ip4address,
972 tunnel, state, (struct ip_pkt *) buf);
975 prepare_ipv6_packet (len, pkt_len, pkt, 0x06, /* TCP */
976 &serv->v6.ip6address,
977 tunnel, state, (struct ip6_pkt *) buf);
985 hash_redirect_info(&state->hash, &state->redirect_info, serv->version == 4 ? 4 : 16);
988 GNUNET_CONTAINER_multihashmap_contains (tcp_connections, &state->hash))
990 GNUNET_CONTAINER_multihashmap_put (tcp_connections, &state->hash, state,
991 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
994 GNUNET_CONTAINER_heap_insert (tcp_connections_heap, state,
995 GNUNET_TIME_absolute_get ().abs_value);
997 if (GNUNET_CONTAINER_heap_get_size(tcp_connections_heap) > max_tcp_connections)
998 GNUNET_SCHEDULER_add_now(collect_connections, tcp_connections_heap);
1001 GNUNET_free (state);
1003 (void) GNUNET_DISK_file_write (helper_handle->fh_to_helper, buf, len);
1008 receive_tcp_remote (void *cls __attribute__((unused)),
1009 struct GNUNET_MESH_Tunnel *tunnel,
1010 void **tunnel_ctx __attribute__((unused)),
1011 const struct GNUNET_PeerIdentity *sender __attribute__((unused)),
1012 const struct GNUNET_MessageHeader *message,
1013 const struct GNUNET_TRANSPORT_ATS_Information *atsi __attribute__((unused)))
1015 GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
1016 struct tcp_pkt *pkt = (struct tcp_pkt *) (desc + 1);
1017 struct remote_addr *s = (struct remote_addr *) desc;
1020 unsigned int pkt_len = ntohs (message->size) - sizeof (struct GNUNET_MessageHeader) - sizeof (GNUNET_HashCode);
1022 struct redirect_state *state =
1023 GNUNET_malloc (sizeof (struct redirect_state));
1024 memset (state, 0, sizeof (struct redirect_state));
1025 state->tunnel = tunnel;
1026 state->type = REMOTE;
1027 state->hashmap = tcp_connections;
1028 memcpy (&state->remote, s, sizeof (struct remote_addr));
1030 len = sizeof (struct GNUNET_MessageHeader) + sizeof (struct pkt_tun) +
1031 sizeof (struct ip6_hdr) + pkt_len;
1034 memset (buf, 0, len);
1039 prepare_ipv4_packet (len, pkt_len, pkt, 0x06, /* TCP */
1040 &s->addr, tunnel, state, (struct ip_pkt *) buf);
1043 prepare_ipv6_packet (len, pkt_len, pkt, 0x06, /* TCP */
1044 &s->addr, tunnel, state, (struct ip6_pkt *) buf);
1051 hash_redirect_info (&state->hash, &state->redirect_info, s->addrlen);
1054 GNUNET_CONTAINER_multihashmap_contains (udp_connections, &state->hash))
1056 GNUNET_CONTAINER_multihashmap_put (udp_connections, &state->hash, state,
1057 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1060 GNUNET_CONTAINER_heap_insert (udp_connections_heap, state,
1061 GNUNET_TIME_absolute_get ().abs_value);
1063 if (GNUNET_CONTAINER_heap_get_size (udp_connections_heap) >
1064 max_udp_connections)
1065 GNUNET_SCHEDULER_add_now (collect_connections, udp_connections_heap);
1068 GNUNET_free (state);
1070 (void) GNUNET_DISK_file_write (helper_handle->fh_to_helper, buf, len);
1076 receive_udp_remote (void *cls __attribute__((unused)),
1077 struct GNUNET_MESH_Tunnel *tunnel,
1078 void **tunnel_ctx __attribute__((unused)),
1079 const struct GNUNET_PeerIdentity *sender __attribute__((unused)),
1080 const struct GNUNET_MessageHeader *message,
1081 const struct GNUNET_TRANSPORT_ATS_Information *atsi __attribute__((unused)))
1083 GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
1084 struct udp_pkt *pkt = (struct udp_pkt *) (desc + 1);
1085 struct remote_addr *s = (struct remote_addr *) desc;
1089 GNUNET_assert (ntohs (pkt->len) ==
1090 ntohs (message->size) -
1091 sizeof (struct GNUNET_MessageHeader) -
1092 sizeof (GNUNET_HashCode));
1094 /* Prepare the state.
1095 * This will be saved in the hashmap, so that the receiving procedure knows
1096 * through which tunnel this connection has to be routed.
1098 struct redirect_state *state =
1099 GNUNET_malloc (sizeof (struct redirect_state));
1100 memset (state, 0, sizeof (struct redirect_state));
1101 state->tunnel = tunnel;
1102 state->hashmap = udp_connections;
1103 state->type = REMOTE;
1104 memcpy (&state->remote, s, sizeof (struct remote_addr));
1106 len = sizeof (struct GNUNET_MessageHeader) + sizeof (struct pkt_tun) +
1107 sizeof (struct ip6_hdr) + ntohs (pkt->len);
1110 memset (buf, 0, len);
1115 prepare_ipv4_packet (len, ntohs (pkt->len), pkt, 0x11, /* UDP */
1116 &s->addr, tunnel, state, (struct ip_pkt *) buf);
1119 prepare_ipv6_packet (len, ntohs (pkt->len), pkt, 0x11, /* UDP */
1120 &s->addr, tunnel, state, (struct ip6_pkt *) buf);
1127 hash_redirect_info (&state->hash, &state->redirect_info, s->addrlen);
1130 GNUNET_CONTAINER_multihashmap_contains (udp_connections, &state->hash))
1132 GNUNET_CONTAINER_multihashmap_put (udp_connections, &state->hash, state,
1133 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1136 GNUNET_CONTAINER_heap_insert (udp_connections_heap, state,
1137 GNUNET_TIME_absolute_get ().abs_value);
1139 if (GNUNET_CONTAINER_heap_get_size (udp_connections_heap) >
1140 max_udp_connections)
1141 GNUNET_SCHEDULER_add_now (collect_connections, udp_connections_heap);
1144 GNUNET_free (state);
1146 (void) GNUNET_DISK_file_write (helper_handle->fh_to_helper, buf, len);
1151 * The messages are one GNUNET_HashCode for the service, followed by a struct udp_pkt
1154 receive_udp_service (void *cls __attribute__((unused)),
1155 struct GNUNET_MESH_Tunnel *tunnel,
1156 void **tunnel_ctx __attribute__((unused)),
1157 const struct GNUNET_PeerIdentity *sender __attribute__((unused)),
1158 const struct GNUNET_MessageHeader *message,
1159 const struct GNUNET_TRANSPORT_ATS_Information *atsi __attribute__((unused)))
1161 GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
1162 struct udp_pkt *pkt = (struct udp_pkt *) (desc + 1);
1164 GNUNET_assert (ntohs (pkt->len) ==
1165 ntohs (message->size) -
1166 sizeof (struct GNUNET_MessageHeader) -
1167 sizeof (GNUNET_HashCode));
1169 /* Get the configuration from the hashmap */
1170 uint16_t *udp_desc = alloca (sizeof (GNUNET_HashCode) + 2);
1171 memcpy (udp_desc + 1, desc, sizeof (GNUNET_HashCode));
1172 *udp_desc = ntohs (pkt->dpt);
1173 struct redirect_service *serv =
1174 GNUNET_CONTAINER_multihashmap_get (udp_services, (GNUNET_HashCode*)udp_desc);
1177 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1178 "No service found for UDP dpt %d!\n", *udp_desc);
1182 pkt->dpt = htons (serv->remote_port);
1185 * At this point it would be possible to check against some kind of ACL.
1191 /* Prepare the state.
1192 * This will be saved in the hashmap, so that the receiving procedure knows
1193 * through which tunnel this connection has to be routed.
1195 struct redirect_state *state =
1196 GNUNET_malloc (sizeof (struct redirect_state));
1197 memset (state, 0, sizeof (struct redirect_state));
1198 state->tunnel = tunnel;
1200 state->type = SERVICE;
1201 state->hashmap = udp_connections;
1202 memcpy (&state->desc, desc, sizeof (GNUNET_HashCode));
1204 len = sizeof (struct GNUNET_MessageHeader) + sizeof (struct pkt_tun) +
1205 sizeof (struct ip6_hdr) + ntohs (pkt->len);
1208 memset (buf, 0, len);
1210 switch (serv->version)
1213 prepare_ipv4_packet (len, ntohs (pkt->len), pkt, 0x11, /* UDP */
1214 &serv->v4.ip4address,
1215 tunnel, state, (struct ip_pkt *) buf);
1218 prepare_ipv6_packet (len, ntohs (pkt->len), pkt, 0x11, /* UDP */
1219 &serv->v6.ip6address,
1220 tunnel, state, (struct ip6_pkt *) buf);
1228 hash_redirect_info(&state->hash, &state->redirect_info, serv->version == 4 ? 4 : 16);
1231 GNUNET_CONTAINER_multihashmap_contains (udp_connections, &state->hash))
1233 GNUNET_CONTAINER_multihashmap_put (udp_connections, &state->hash, state,
1234 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1237 GNUNET_CONTAINER_heap_insert (udp_connections_heap, state,
1238 GNUNET_TIME_absolute_get ().abs_value);
1240 if (GNUNET_CONTAINER_heap_get_size(udp_connections_heap) > max_udp_connections)
1241 GNUNET_SCHEDULER_add_now(collect_connections, udp_connections_heap);
1244 GNUNET_free (state);
1246 (void) GNUNET_DISK_file_write (helper_handle->fh_to_helper, buf, len);
1254 int handler_idx, app_idx;
1256 udp = GNUNET_CONFIGURATION_get_value_yesno(cfg, "exit", "ENABLE_UDP");
1257 tcp = GNUNET_CONFIGURATION_get_value_yesno(cfg, "exit", "ENABLE_TCP");
1259 static struct GNUNET_MESH_MessageHandler handlers[] = {
1260 {receive_udp_service, GNUNET_MESSAGE_TYPE_SERVICE_UDP, 0},
1261 {receive_tcp_service, GNUNET_MESSAGE_TYPE_SERVICE_TCP, 0},
1267 static GNUNET_MESH_ApplicationType apptypes[] =
1269 GNUNET_APPLICATION_TYPE_END,
1270 GNUNET_APPLICATION_TYPE_END,
1271 GNUNET_APPLICATION_TYPE_END
1277 if (GNUNET_YES == udp)
1279 handlers[handler_idx].callback = receive_udp_remote;
1280 handlers[handler_idx].expected_size = 0;
1281 handlers[handler_idx].type = GNUNET_MESSAGE_TYPE_REMOTE_UDP;
1282 apptypes[app_idx] = GNUNET_APPLICATION_TYPE_INTERNET_UDP_GATEWAY;
1287 if (GNUNET_YES == tcp)
1289 handlers[handler_idx].callback = receive_tcp_remote;
1290 handlers[handler_idx].expected_size = 0;
1291 handlers[handler_idx].type = GNUNET_MESSAGE_TYPE_REMOTE_TCP;
1292 apptypes[app_idx] = GNUNET_APPLICATION_TYPE_INTERNET_TCP_GATEWAY;
1297 mesh_handle = GNUNET_MESH_connect (cfg, NULL, NULL, handlers, apptypes);
1301 * @brief Main function that will be run by the scheduler.
1303 * @param cls closure
1304 * @param args remaining command-line arguments
1305 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
1306 * @param cfg_ configuration
1310 char *const *args __attribute__((unused)),
1311 const char *cfgfile __attribute__((unused)), const struct GNUNET_CONFIGURATION_Handle *cfg_)
1317 udp_connections = GNUNET_CONTAINER_multihashmap_create (65536);
1318 udp_connections_heap =
1319 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1320 tcp_connections = GNUNET_CONTAINER_multihashmap_create (65536);
1321 tcp_connections_heap =
1322 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1323 udp_services = GNUNET_CONTAINER_multihashmap_create (65536);
1324 tcp_services = GNUNET_CONTAINER_multihashmap_create (65536);
1326 GNUNET_CONFIGURATION_get_value_number (cfg, "exit", "MAX_UDP_CONNECTIONS",
1327 &max_udp_connections);
1328 GNUNET_CONFIGURATION_get_value_number (cfg, "exit", "MAX_TCP_CONNECTIONS",
1329 &max_tcp_connections);
1331 GNUNET_CONFIGURATION_iterate_sections (cfg, read_service_conf, NULL);
1333 GNUNET_SCHEDULER_add_now (start_helper_and_schedule, NULL);
1334 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &cleanup, cls);
1338 * The main function to obtain template from gnunetd.
1340 * @param argc number of arguments from the command line
1341 * @param argv command line arguments
1342 * @return 0 ok, 1 on error
1345 main (int argc, char *const *argv) {
1346 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
1347 GNUNET_GETOPT_OPTION_END
1350 return (GNUNET_OK ==
1351 GNUNET_PROGRAM_run (argc,
1354 gettext_noop ("help text"),
1355 options, &run, NULL)) ? ret : 1;
1358 /* end of gnunet-daemon-exit.c */