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"
40 * The handle to the configuration used throughout the process
42 static const struct GNUNET_CONFIGURATION_Handle *cfg;
45 * The handle to the service-configuration
47 static struct GNUNET_CONFIGURATION_Handle *servicecfg;
50 * The handle to the helper
52 struct GNUNET_VPN_HELPER_Handle *helper_handle;
62 static struct GNUNET_MESH_Handle *mesh_handle;
65 * This hashmaps contains the mapping from peer, service-descriptor,
66 * source-port and destination-port to a struct redirect_state
68 static struct GNUNET_CONTAINER_MultiHashMap *udp_connections;
69 static struct GNUNET_CONTAINER_Heap *udp_connections_heap;
70 static struct GNUNET_CONTAINER_MultiHashMap *tcp_connections;
71 static struct GNUNET_CONTAINER_Heap *tcp_connections_heap;
74 * If there are at least this many udp-Connections, old ones will be removed
76 static long long unsigned int max_udp_connections = 200;
79 * If there are at least this many tcp-Connections, old ones will be removed
81 static long long unsigned int max_tcp_connections = 200;
86 unsigned char addr[16];
91 * This struct is saved into the services-hashmap
93 struct redirect_service
100 uint16_t remote_port;
118 * The source-address of this connection. When a packet to this address is
119 * received, this tunnel is used to forward it. ipv4-addresses will be put
120 * here left-aligned */
123 * The source-port of this connection
129 * This struct is saved into {tcp,udp}_connections;
131 struct redirect_state
133 struct GNUNET_MESH_Tunnel *tunnel;
134 GNUNET_HashCode desc;
135 struct redirect_service *serv;
136 struct remote_addr remote;
138 struct GNUNET_CONTAINER_HeapNode* heap_node;
139 struct GNUNET_CONTAINER_MultiHashMap *hashmap;
140 GNUNET_HashCode hash;
142 enum { SERVICE, REMOTE } type;
145 * The source-address and -port of this connection
147 struct redirect_info redirect_info;
151 * This hashmaps saves interesting things about the configured services
153 static struct GNUNET_CONTAINER_MultiHashMap *udp_services;
154 static struct GNUNET_CONTAINER_MultiHashMap *tcp_services;
157 * Function that frees everything from a hashmap
160 free_iterate(void* cls, const GNUNET_HashCode* hash, void* value)
167 * Function scheduled as very last function, cleans up after us
170 cleanup(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tskctx) {
171 GNUNET_assert (0 != (tskctx->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN));
173 GNUNET_CONTAINER_multihashmap_iterate(udp_connections,
177 GNUNET_CONTAINER_multihashmap_iterate(tcp_connections,
181 if (mesh_handle != NULL)
183 GNUNET_MESH_disconnect(mesh_handle);
189 collect_connections(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tc) {
190 if ( (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
194 struct GNUNET_CONTAINER_Heap *heap = cls;
196 struct redirect_state* state = GNUNET_CONTAINER_heap_remove_root(heap);
198 /* This is free()ed memory! */
199 state->heap_node = NULL;
201 /* FIXME! GNUNET_MESH_close_tunnel(state->tunnel); */
203 GNUNET_CONTAINER_multihashmap_remove(state->hashmap, &state->hash, state);
209 hash_redirect_info(GNUNET_HashCode* hash, struct redirect_info* u_i, size_t addrlen)
212 /* the gnunet hashmap only uses the first 32bit of the hash
214 * build the hash out of the last two bytes of the address and the 2 bytes of
217 memcpy(&hash, &u_i->pt, sizeof(u_i->pt));
218 memcpy(((unsigned char*)&hash)+2, u_i->addr+(addrlen-2), 2);
222 * cls is the pointer to a GNUNET_MessageHeader that is
223 * followed by the service-descriptor and the udp-packet that should be sent;
226 send_udp_to_peer_notify_callback (void *cls, size_t size, void *buf)
228 struct GNUNET_MessageHeader *hdr = cls;
229 GNUNET_assert (size >= ntohs (hdr->size));
230 memcpy (buf, hdr, ntohs (hdr->size));
231 size = ntohs(hdr->size);
237 * @brief Handles an UDP-Packet received from the helper.
239 * @param udp A pointer to the Packet
240 * @param dadr The IP-Destination-address
241 * @param addrlen The length of the address
242 * @param version 4 or 6
245 udp_from_helper (struct udp_pkt *udp, unsigned char *dadr, size_t addrlen,
246 unsigned int version)
248 struct redirect_info u_i;
249 struct GNUNET_MESH_Tunnel *tunnel;
251 struct GNUNET_MessageHeader *msg;
253 memset (&u_i, 0, sizeof (struct redirect_info));
255 memcpy (&u_i.addr, dadr, addrlen);
259 /* get tunnel and service-descriptor from this */
260 GNUNET_HashCode hash;
261 hash_redirect_info(&hash, &u_i, addrlen);
263 struct redirect_state *state =
264 GNUNET_CONTAINER_multihashmap_get (udp_connections, &hash);
266 /* Mark this connection as freshly used */
267 GNUNET_CONTAINER_heap_update_cost (udp_connections_heap, state->heap_node,
268 GNUNET_TIME_absolute_get ().abs_value);
270 tunnel = state->tunnel;
272 if (state->type == SERVICE)
274 /* check if spt == serv.remote if yes: set spt = serv.myport ("nat") */
275 if (ntohs (udp->spt) == state->serv->remote_port)
277 udp->spt = htons (state->serv->my_port);
281 /* otherwise the answer came from a different port (tftp does this)
282 * add this new port to the list of all services, so that the packets
283 * coming back from the client to this new port will be routed correctly
285 struct redirect_service *serv =
286 GNUNET_malloc (sizeof (struct redirect_service));
287 memcpy (serv, state->serv, sizeof (struct redirect_service));
288 serv->my_port = ntohs (udp->spt);
289 serv->remote_port = ntohs (udp->spt);
290 uint16_t *desc = alloca (sizeof (GNUNET_HashCode) + 2);
291 memcpy ((GNUNET_HashCode *) (desc + 1), &state->desc,
292 sizeof (GNUNET_HashCode));
293 *desc = ntohs (udp->spt);
294 GNUNET_assert (GNUNET_OK ==
295 GNUNET_CONTAINER_multihashmap_put (udp_services,
296 (GNUNET_HashCode*)desc, serv,
297 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
303 /* send udp-packet back */
305 sizeof (struct GNUNET_MessageHeader) + sizeof (GNUNET_HashCode) +
307 msg = GNUNET_malloc (len);
308 msg->size = htons (len);
309 msg->type = htons (state->type == SERVICE ? GNUNET_MESSAGE_TYPE_SERVICE_UDP_BACK : GNUNET_MESSAGE_TYPE_REMOTE_UDP_BACK);
310 GNUNET_HashCode *desc = (GNUNET_HashCode *) (msg + 1);
311 if (state->type == SERVICE)
312 memcpy (desc, &state->desc, sizeof (GNUNET_HashCode));
314 memcpy (desc, &state->remote, sizeof (struct remote_addr));
315 void *_udp = desc + 1;
316 memcpy (_udp, udp, ntohs (udp->len));
318 GNUNET_MESH_notify_transmit_ready (tunnel,
321 GNUNET_TIME_relative_divide
322 (GNUNET_CONSTANTS_MAX_CORK_DELAY, 2),
323 (const struct GNUNET_PeerIdentity *)
325 send_udp_to_peer_notify_callback, msg);
329 * @brief Handles a TCP-Packet received from the helper.
331 * @param tcp A pointer to the Packet
332 * @param dadr The IP-Destination-address
333 * @param addrlen The length of the address
334 * @param version 4 or 6
335 * @param pktlen the length of the packet, including its header
338 tcp_from_helper (struct tcp_pkt *tcp, unsigned char *dadr, size_t addrlen,
339 unsigned int version, size_t pktlen)
341 struct redirect_info u_i;
342 struct GNUNET_MESH_Tunnel *tunnel;
344 struct GNUNET_MessageHeader *msg;
346 memset (&u_i, 0, sizeof (struct redirect_info));
348 memcpy (&u_i.addr, dadr, addrlen);
351 /* get tunnel and service-descriptor from this */
352 GNUNET_HashCode hash;
353 hash_redirect_info(&hash, &u_i, addrlen);
355 struct redirect_state *state =
356 GNUNET_CONTAINER_multihashmap_get (tcp_connections, &hash);
358 /* Mark this connection as freshly used */
359 GNUNET_CONTAINER_heap_update_cost (tcp_connections_heap, state->heap_node,
360 GNUNET_TIME_absolute_get ().abs_value);
362 tunnel = state->tunnel;
364 if (state->type == SERVICE)
366 /* check if spt == serv.remote if yes: set spt = serv.myport ("nat") */
367 if (ntohs (tcp->spt) == state->serv->remote_port)
369 tcp->spt = htons (state->serv->my_port);
373 // This is an illegal packet.
378 /* send tcp-packet back */
380 sizeof (struct GNUNET_MessageHeader) + sizeof (GNUNET_HashCode) + pktlen;
381 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "len: %d\n", pktlen);
382 msg = GNUNET_malloc (len);
383 msg->size = htons (len);
384 msg->type = htons (state->type == SERVICE ? GNUNET_MESSAGE_TYPE_SERVICE_TCP_BACK : GNUNET_MESSAGE_TYPE_REMOTE_TCP_BACK);
385 GNUNET_HashCode *desc = (GNUNET_HashCode *) (msg + 1);
386 if (state->type == SERVICE)
387 memcpy (desc, &state->desc, sizeof (GNUNET_HashCode));
389 memcpy (desc, &state->remote, sizeof (struct remote_addr));
390 void *_tcp = desc + 1;
391 memcpy (_tcp, tcp, pktlen);
393 GNUNET_MESH_notify_transmit_ready (tunnel,
396 GNUNET_TIME_relative_divide
397 (GNUNET_CONSTANTS_MAX_CORK_DELAY, 2),
398 (const struct GNUNET_PeerIdentity *)NULL,
399 len, send_udp_to_peer_notify_callback,
405 * Receive packets from the helper-process
408 message_token (void *cls,
409 void *client, const struct GNUNET_MessageHeader *message)
411 GNUNET_assert (ntohs (message->type) == GNUNET_MESSAGE_TYPE_VPN_HELPER);
413 struct tun_pkt *pkt_tun = (struct tun_pkt *) message;
415 /* ethertype is ipv6 */
416 if (ntohs (pkt_tun->tun.type) == 0x86dd)
418 struct ip6_pkt *pkt6 = (struct ip6_pkt *) pkt_tun;
419 if (0x11 == pkt6->ip6_hdr.nxthdr)
420 udp_from_helper (&((struct ip6_udp *) pkt6)->udp_hdr,
421 (unsigned char *) &pkt6->ip6_hdr.dadr, 16, 6);
422 else if (0x06 == pkt6->ip6_hdr.nxthdr)
423 tcp_from_helper (&((struct ip6_tcp *) pkt6)->tcp_hdr,
424 (unsigned char *) &pkt6->ip6_hdr.dadr, 16, 6,
425 ntohs (pkt6->ip6_hdr.paylgth));
427 else if (ntohs (pkt_tun->tun.type) == 0x0800)
429 struct ip_pkt *pkt4 = (struct ip_pkt *) pkt_tun;
430 uint32_t tmp = pkt4->ip_hdr.dadr;
431 if (0x11 == pkt4->ip_hdr.proto)
432 udp_from_helper (&((struct ip_udp *) pkt4)->udp_hdr,
433 (unsigned char *) &tmp, 4, 4);
434 else if (0x06 == pkt4->ip_hdr.proto)
436 size_t pktlen = ntohs(pkt4->ip_hdr.tot_lngth);
437 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "tot: %d\n", pktlen);
438 pktlen -= 4*pkt4->ip_hdr.hdr_lngth;
439 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "-hdr: %d\n", pktlen);
440 tcp_from_helper (&((struct ip_tcp *) pkt4)->tcp_hdr,
441 (unsigned char *) &tmp, 4, 4, pktlen);
451 * Reads the configuration servicecfg and populates udp_services
454 * @param section name of section in config, equal to hostname
455 * @param option type of redirect
456 * @param value specification of services, format is
457 * "OFFERED-PORT:HOSTNAME:HOST-PORT" (SPACE <more of those>)*
460 read_service_conf (void *cls, const char *section, const char *option,
467 GNUNET_HashCode hash;
468 uint16_t *desc = alloca (sizeof (GNUNET_HashCode) + 2);
469 GNUNET_CRYPTO_hash (section, strlen (section) + 1,
470 (GNUNET_HashCode *) (desc + 1));
476 if (0 == strcmp ("UDP_REDIRECTS", option))
478 else if (0 == strcmp ("TCP_REDIRECTS", option))
485 cpy = GNUNET_strdup (value);
486 for (redirect = strtok (cpy, " "); redirect != NULL; redirect = strtok
489 if (NULL == (hostname = strstr (redirect, ":")))
491 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Warning: option %s is not formatted correctly!\n",
497 if (NULL == (hostport = strstr (hostname, ":")))
499 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Warning: option %s is not formatted correctly!\n",
506 int local_port = atoi (redirect);
507 if (!((local_port > 0) && (local_port < 65536)))
508 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Warning: %s is not a correct port.",
513 struct redirect_service *serv =
514 GNUNET_malloc (sizeof (struct redirect_service));
515 memset (serv, 0, sizeof (struct redirect_service));
516 serv->my_port = local_port;
518 if (0 == strcmp ("localhost4", hostname))
523 GNUNET_assert (GNUNET_OK ==
524 GNUNET_CONFIGURATION_get_value_string (cfg,
529 inet_pton (AF_INET, ip4addr,
530 serv->v4.ip4address));
531 GNUNET_free (ip4addr);
533 else if (0 == strcmp ("localhost6", hostname))
538 GNUNET_assert (GNUNET_OK ==
539 GNUNET_CONFIGURATION_get_value_string (cfg,
544 inet_pton (AF_INET6, ip6addr,
545 serv->v6.ip6address));
546 GNUNET_free (ip6addr);
550 // TODO Lookup, yadayadayada
553 serv->remote_port = atoi (hostport);
554 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Store with key1 %x\n",
555 *((unsigned long long *) (desc + 1)));
556 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Store with key2 %x\n",
557 *((unsigned long long *) &hash));
559 GNUNET_assert (GNUNET_OK ==
560 GNUNET_CONTAINER_multihashmap_put (udp_services,
561 (GNUNET_HashCode*)desc, serv,
562 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
564 GNUNET_assert (GNUNET_OK ==
565 GNUNET_CONTAINER_multihashmap_put (tcp_services,
566 (GNUNET_HashCode*)desc, serv,
567 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
575 * Start the helper-process
577 * If cls != NULL it is assumed that this function is called as a result of a dying
578 * helper. cls is then taken as handle to the old helper and is cleaned up.
581 start_helper_and_schedule(void *cls,
582 const struct GNUNET_SCHEDULER_TaskContext *tc) {
583 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
596 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string(cfg, "exit", "IFNAME", &ifname))
598 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "No entry 'IFNAME' in configuration!\n");
602 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string(cfg, "exit", "IPV6ADDR", &ipv6addr))
604 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "No entry 'IPV6ADDR' in configuration!\n");
608 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string(cfg, "exit", "IPV6PREFIX", &ipv6prefix))
610 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "No entry 'IPV6PREFIX' in configuration!\n");
614 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string(cfg, "exit", "IPV4ADDR", &ipv4addr))
616 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "No entry 'IPV4ADDR' in configuration!\n");
620 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string(cfg, "exit", "IPV4MASK", &ipv4mask))
622 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "No entry 'IPV4MASK' in configuration!\n");
627 * Messages get passed to the function message_token
628 * When the helper dies, this function will be called again with the
629 * helper_handle as cls.
631 helper_handle = start_helper(ifname,
637 start_helper_and_schedule,
642 GNUNET_free(ipv6addr);
643 GNUNET_free(ipv6prefix);
644 GNUNET_free(ipv4addr);
645 GNUNET_free(ipv4mask);
650 prepare_ipv4_packet (ssize_t len, ssize_t pktlen, void *payload,
651 uint16_t protocol, void *ipaddress, void *tunnel,
652 struct redirect_state *state, struct ip_pkt *pkt4)
656 pkt4->shdr.type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
657 pkt4->shdr.size = htons (len);
659 pkt4->tun.type = htons (0x0800);
661 memcpy (&pkt4->data, payload, pktlen);
663 pkt4->ip_hdr.version = 4;
664 pkt4->ip_hdr.hdr_lngth = 5;
665 pkt4->ip_hdr.diff_serv = 0;
666 pkt4->ip_hdr.tot_lngth = htons (20 + pktlen);
667 pkt4->ip_hdr.ident = 0;
668 pkt4->ip_hdr.flags = 0;
669 pkt4->ip_hdr.frag_off = 0;
670 pkt4->ip_hdr.ttl = 255;
671 pkt4->ip_hdr.proto = protocol;
672 pkt4->ip_hdr.chks = 0; /* Will be calculated later */
674 memcpy (&tmp, ipaddress, 4);
675 pkt4->ip_hdr.dadr = tmp;
677 /* Generate a new src-address */
680 GNUNET_assert (GNUNET_OK ==
681 GNUNET_CONFIGURATION_get_value_string (cfg, "exit",
684 GNUNET_assert (GNUNET_OK ==
685 GNUNET_CONFIGURATION_get_value_string (cfg, "exit",
688 inet_pton (AF_INET, ipv4addr, &tmp);
689 inet_pton (AF_INET, ipv4mask, &tmp2);
690 GNUNET_free (ipv4addr);
691 GNUNET_free (ipv4mask);
693 /* This should be a noop */
696 tmp |= ntohl (*((uint32_t *) tunnel)) & (~tmp2);
698 pkt4->ip_hdr.sadr = tmp;
700 memcpy (&state->redirect_info.addr, &tmp, 4);
701 if (0x11 == protocol)
703 struct ip_udp* pkt4_udp = (struct ip_udp*)pkt4;
704 state->redirect_info.pt = pkt4_udp->udp_hdr.spt;
706 pkt4_udp->udp_hdr.crc = 0; /* Optional for IPv4 */
708 else if (0x06 == protocol)
710 struct ip_tcp* pkt4_tcp = (struct ip_tcp*)pkt4;
711 state->redirect_info.pt = pkt4_tcp->tcp_hdr.spt;
713 pkt4_tcp->tcp_hdr.crc = 0;
715 tmp = pkt4->ip_hdr.sadr;
717 calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
718 tmp = pkt4->ip_hdr.dadr;
720 calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
722 tmp = (protocol << 16) | (0xffff & pktlen);
724 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "line: %08x, %x \n", tmp, (0xffff & pktlen));
728 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
731 calculate_checksum_update (sum, (uint16_t *) & pkt4_tcp->tcp_hdr, pktlen);
732 pkt4_tcp->tcp_hdr.crc = calculate_checksum_end (sum);
736 calculate_ip_checksum ((uint16_t *) & pkt4->ip_hdr, 5 * 4);
740 prepare_ipv6_packet (ssize_t len, ssize_t pktlen, void *payload,
741 uint16_t protocol, void *ipaddress, void *tunnel,
742 struct redirect_state *state, struct ip6_pkt *pkt6)
746 pkt6->shdr.type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
747 pkt6->shdr.size = htons (len);
750 pkt6->tun.type = htons (0x86dd);
752 memcpy (&pkt6->data, payload, pktlen);
754 pkt6->ip6_hdr.version = 6;
755 pkt6->ip6_hdr.nxthdr = protocol;
756 pkt6->ip6_hdr.paylgth = htons (pktlen);
757 pkt6->ip6_hdr.hoplmt = 64;
759 memcpy (pkt6->ip6_hdr.dadr, ipaddress, 16);
761 /* Generate a new src-address
762 * This takes as much from the address of the tunnel as fits into
765 unsigned long long ipv6prefix;
766 GNUNET_assert (GNUNET_OK ==
767 GNUNET_CONFIGURATION_get_value_string (cfg, "exit",
770 GNUNET_assert (GNUNET_OK ==
771 GNUNET_CONFIGURATION_get_value_number (cfg, "exit",
774 GNUNET_assert (ipv6prefix < 127);
775 ipv6prefix = (ipv6prefix + 7) / 8;
777 inet_pton (AF_INET6, ipv6addr, &pkt6->ip6_hdr.sadr);
778 GNUNET_free (ipv6addr);
780 if (ipv6prefix < (16 - sizeof (void *)))
781 ipv6prefix = 16 - sizeof (void *);
783 unsigned int offset = ipv6prefix - (16 - sizeof (void *));
784 memcpy ((((char *) &pkt6->ip6_hdr.sadr)) + ipv6prefix,
785 ((char *) &tunnel) + offset, 16 - ipv6prefix);
787 /* copy the needed information into the state */
788 memcpy (&state->redirect_info.addr, &pkt6->ip6_hdr.sadr, 16);
790 if (0x11 == protocol)
792 struct ip6_udp* pkt6_udp = (struct ip6_udp*)pkt6;
793 state->redirect_info.pt = pkt6_udp->udp_hdr.spt;
795 pkt6_udp->udp_hdr.crc = 0;
798 calculate_checksum_update (sum, (uint16_t *) & pkt6_udp->ip6_hdr.sadr, 16);
800 calculate_checksum_update (sum, (uint16_t *) & pkt6_udp->ip6_hdr.dadr, 16);
801 tmp = (htons (pktlen) & 0xffff);
802 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
803 tmp = htons (((pkt6_udp->ip6_hdr.nxthdr & 0x00ff)));
804 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
807 calculate_checksum_update (sum, (uint16_t *) & pkt6_udp->udp_hdr,
808 ntohs (pkt6_udp->udp_hdr.len));
809 pkt6_udp->udp_hdr.crc = calculate_checksum_end (sum);
811 else if (0x06 == protocol)
813 struct ip6_tcp* pkt6_tcp = (struct ip6_tcp*)pkt6;
814 state->redirect_info.pt = pkt6_tcp->tcp_hdr.spt;
816 pkt6_tcp->tcp_hdr.crc = 0;
819 calculate_checksum_update (sum, (uint16_t *) & pkt6->ip6_hdr.sadr, 16);
821 calculate_checksum_update (sum, (uint16_t *) & pkt6->ip6_hdr.dadr, 16);
823 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
824 tmp = htonl (((pkt6->ip6_hdr.nxthdr & 0x000000ff)));
825 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
828 calculate_checksum_update (sum, (uint16_t *) & pkt6_tcp->tcp_hdr,
829 ntohs (pkt6->ip6_hdr.paylgth));
830 pkt6_tcp->tcp_hdr.crc = calculate_checksum_end (sum);
835 * The messages are one GNUNET_HashCode for the service followed by a struct tcp_pkt
838 receive_tcp_service (void *cls,
839 struct GNUNET_MESH_Tunnel *tunnel,
841 const struct GNUNET_PeerIdentity *sender,
842 const struct GNUNET_MessageHeader *message,
843 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
845 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received TCP-Packet\n");
846 GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
847 struct tcp_pkt *pkt = (struct tcp_pkt *) (desc + 1);
848 unsigned int pkt_len = ntohs (message->size) - sizeof (struct
849 GNUNET_MessageHeader)
850 - sizeof (GNUNET_HashCode);
852 /** Get the configuration from the services-hashmap.
854 * Which service is needed only depends on the service-descriptor and the
857 uint16_t *tcp_desc = alloca (sizeof (GNUNET_HashCode) + 2);
859 memcpy (tcp_desc + 1, desc, sizeof (GNUNET_HashCode));
860 *tcp_desc = ntohs (pkt->dpt);
861 struct redirect_service *serv =
862 GNUNET_CONTAINER_multihashmap_get (tcp_services, (GNUNET_HashCode*)tcp_desc);
865 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
866 "No service found for TCP dpt %d!\n", *tcp_desc);
870 pkt->dpt = htons (serv->remote_port);
873 * At this point it would be possible to check against some kind of ACL.
879 /* Prepare the state.
880 * This will be saved in the hashmap, so that the receiving procedure knows
881 * through which tunnel this connection has to be routed.
883 struct redirect_state *state =
884 GNUNET_malloc (sizeof (struct redirect_state));
885 memset (state, 0, sizeof (struct redirect_state));
886 state->tunnel = tunnel;
888 state->type = SERVICE;
889 state->hashmap = tcp_connections;
890 memcpy (&state->desc, desc, sizeof (GNUNET_HashCode));
892 len = sizeof (struct GNUNET_MessageHeader) + sizeof (struct pkt_tun) +
893 sizeof (struct ip6_hdr) + pkt_len;
896 memset (buf, 0, len);
898 switch (serv->version)
901 prepare_ipv4_packet (len, pkt_len, pkt, 0x06, /* TCP */
902 &serv->v4.ip4address,
903 tunnel, state, (struct ip_pkt *) buf);
906 prepare_ipv6_packet (len, pkt_len, pkt, 0x06, /* TCP */
907 &serv->v6.ip6address,
908 tunnel, state, (struct ip6_pkt *) buf);
916 hash_redirect_info(&state->hash, &state->redirect_info, serv->version == 4 ? 4 : 16);
919 GNUNET_CONTAINER_multihashmap_contains (tcp_connections, &state->hash))
921 GNUNET_CONTAINER_multihashmap_put (tcp_connections, &state->hash, state,
922 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
925 GNUNET_CONTAINER_heap_insert (tcp_connections_heap, state,
926 GNUNET_TIME_absolute_get ().abs_value);
928 if (GNUNET_CONTAINER_heap_get_size(tcp_connections_heap) > max_tcp_connections)
929 GNUNET_SCHEDULER_add_now(collect_connections, tcp_connections_heap);
934 (void) GNUNET_DISK_file_write (helper_handle->fh_to_helper, buf, len);
939 receive_tcp_remote (void *cls,
940 struct GNUNET_MESH_Tunnel *tunnel,
942 const struct GNUNET_PeerIdentity *sender,
943 const struct GNUNET_MessageHeader *message,
944 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
946 GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
947 struct udp_pkt *pkt = (struct udp_pkt *) (desc + 1);
948 struct remote_addr *s = (struct remote_addr *) desc;
951 unsigned int pkt_len = ntohs (message->size) - sizeof (struct GNUNET_MessageHeader) - sizeof (GNUNET_HashCode);
953 struct redirect_state *state =
954 GNUNET_malloc (sizeof (struct redirect_state));
955 memset (state, 0, sizeof (struct redirect_state));
956 state->tunnel = tunnel;
957 state->type = REMOTE;
958 state->hashmap = tcp_connections;
959 memcpy (&state->remote, s, sizeof (struct remote_addr));
961 len = sizeof (struct GNUNET_MessageHeader) + sizeof (struct pkt_tun) +
962 sizeof (struct ip6_hdr) + pkt_len;
965 memset (buf, 0, len);
970 prepare_ipv4_packet (len, ntohs (pkt->len), pkt, 0x06, /* TCP */
971 &s->addr, tunnel, state, (struct ip_pkt *) buf);
974 prepare_ipv6_packet (len, ntohs (pkt->len), pkt, 0x06, /* TCP */
975 &s->addr, tunnel, state, (struct ip6_pkt *) buf);
982 hash_redirect_info (&state->hash, &state->redirect_info, s->addrlen);
985 GNUNET_CONTAINER_multihashmap_contains (udp_connections, &state->hash))
987 GNUNET_CONTAINER_multihashmap_put (udp_connections, &state->hash, state,
988 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
991 GNUNET_CONTAINER_heap_insert (udp_connections_heap, state,
992 GNUNET_TIME_absolute_get ().abs_value);
994 if (GNUNET_CONTAINER_heap_get_size (udp_connections_heap) >
996 GNUNET_SCHEDULER_add_now (collect_connections, udp_connections_heap);
1001 (void) GNUNET_DISK_file_write (helper_handle->fh_to_helper, buf, len);
1007 receive_udp_remote (void *cls,
1008 struct GNUNET_MESH_Tunnel *tunnel,
1010 const struct GNUNET_PeerIdentity *sender,
1011 const struct GNUNET_MessageHeader *message,
1012 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1014 GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
1015 struct udp_pkt *pkt = (struct udp_pkt *) (desc + 1);
1016 struct remote_addr *s = (struct remote_addr *) desc;
1020 GNUNET_assert (ntohs (pkt->len) ==
1021 ntohs (message->size) -
1022 sizeof (struct GNUNET_MessageHeader) -
1023 sizeof (GNUNET_HashCode));
1025 /* Prepare the state.
1026 * This will be saved in the hashmap, so that the receiving procedure knows
1027 * through which tunnel this connection has to be routed.
1029 struct redirect_state *state =
1030 GNUNET_malloc (sizeof (struct redirect_state));
1031 memset (state, 0, sizeof (struct redirect_state));
1032 state->tunnel = tunnel;
1033 state->hashmap = udp_connections;
1034 state->type = REMOTE;
1035 memcpy (&state->remote, s, sizeof (struct remote_addr));
1037 len = sizeof (struct GNUNET_MessageHeader) + sizeof (struct pkt_tun) +
1038 sizeof (struct ip6_hdr) + ntohs (pkt->len);
1041 memset (buf, 0, len);
1046 prepare_ipv4_packet (len, ntohs (pkt->len), pkt, 0x11, /* UDP */
1047 &s->addr, tunnel, state, (struct ip_pkt *) buf);
1050 prepare_ipv6_packet (len, ntohs (pkt->len), pkt, 0x11, /* UDP */
1051 &s->addr, tunnel, state, (struct ip6_pkt *) buf);
1058 hash_redirect_info (&state->hash, &state->redirect_info, s->addrlen);
1061 GNUNET_CONTAINER_multihashmap_contains (udp_connections, &state->hash))
1063 GNUNET_CONTAINER_multihashmap_put (udp_connections, &state->hash, state,
1064 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1067 GNUNET_CONTAINER_heap_insert (udp_connections_heap, state,
1068 GNUNET_TIME_absolute_get ().abs_value);
1070 if (GNUNET_CONTAINER_heap_get_size (udp_connections_heap) >
1071 max_udp_connections)
1072 GNUNET_SCHEDULER_add_now (collect_connections, udp_connections_heap);
1075 GNUNET_free (state);
1077 (void) GNUNET_DISK_file_write (helper_handle->fh_to_helper, buf, len);
1082 * The messages are one GNUNET_HashCode for the service, followed by a struct udp_pkt
1085 receive_udp_service (void *cls,
1086 struct GNUNET_MESH_Tunnel *tunnel,
1088 const struct GNUNET_PeerIdentity *sender,
1089 const struct GNUNET_MessageHeader *message,
1090 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1092 GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
1093 struct udp_pkt *pkt = (struct udp_pkt *) (desc + 1);
1095 GNUNET_assert (ntohs (pkt->len) ==
1096 ntohs (message->size) -
1097 sizeof (struct GNUNET_MessageHeader) -
1098 sizeof (GNUNET_HashCode));
1100 /* Get the configuration from the hashmap */
1101 uint16_t *udp_desc = alloca (sizeof (GNUNET_HashCode) + 2);
1102 memcpy (udp_desc + 1, desc, sizeof (GNUNET_HashCode));
1103 *udp_desc = ntohs (pkt->dpt);
1104 struct redirect_service *serv =
1105 GNUNET_CONTAINER_multihashmap_get (udp_services, (GNUNET_HashCode*)udp_desc);
1108 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1109 "No service found for UDP dpt %d!\n", *udp_desc);
1113 pkt->dpt = htons (serv->remote_port);
1116 * At this point it would be possible to check against some kind of ACL.
1122 /* Prepare the state.
1123 * This will be saved in the hashmap, so that the receiving procedure knows
1124 * through which tunnel this connection has to be routed.
1126 struct redirect_state *state =
1127 GNUNET_malloc (sizeof (struct redirect_state));
1128 memset (state, 0, sizeof (struct redirect_state));
1129 state->tunnel = tunnel;
1131 state->type = SERVICE;
1132 state->hashmap = udp_connections;
1133 memcpy (&state->desc, desc, sizeof (GNUNET_HashCode));
1135 len = sizeof (struct GNUNET_MessageHeader) + sizeof (struct pkt_tun) +
1136 sizeof (struct ip6_hdr) + ntohs (pkt->len);
1139 memset (buf, 0, len);
1141 switch (serv->version)
1144 prepare_ipv4_packet (len, ntohs (pkt->len), pkt, 0x11, /* UDP */
1145 &serv->v4.ip4address,
1146 tunnel, state, (struct ip_pkt *) buf);
1149 prepare_ipv6_packet (len, ntohs (pkt->len), pkt, 0x11, /* UDP */
1150 &serv->v6.ip6address,
1151 tunnel, state, (struct ip6_pkt *) buf);
1159 hash_redirect_info(&state->hash, &state->redirect_info, serv->version == 4 ? 4 : 16);
1162 GNUNET_CONTAINER_multihashmap_contains (udp_connections, &state->hash))
1164 GNUNET_CONTAINER_multihashmap_put (udp_connections, &state->hash, state,
1165 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1168 GNUNET_CONTAINER_heap_insert (udp_connections_heap, state,
1169 GNUNET_TIME_absolute_get ().abs_value);
1171 if (GNUNET_CONTAINER_heap_get_size(udp_connections_heap) > max_udp_connections)
1172 GNUNET_SCHEDULER_add_now(collect_connections, udp_connections_heap);
1175 GNUNET_free (state);
1177 (void) GNUNET_DISK_file_write (helper_handle->fh_to_helper, buf, len);
1182 * @brief Main function that will be run by the scheduler.
1184 * @param cls closure
1185 * @param args remaining command-line arguments
1186 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
1187 * @param cfg_ configuration
1192 const char *cfgfile, const struct GNUNET_CONFIGURATION_Handle *cfg_)
1194 const static struct GNUNET_MESH_MessageHandler handlers[] = {
1195 {receive_udp_service, GNUNET_MESSAGE_TYPE_SERVICE_UDP, 0},
1196 {receive_tcp_service, GNUNET_MESSAGE_TYPE_SERVICE_TCP, 0},
1197 {receive_udp_remote, GNUNET_MESSAGE_TYPE_REMOTE_UDP, 0},
1198 {receive_tcp_remote, GNUNET_MESSAGE_TYPE_REMOTE_TCP, 0},
1202 const static GNUNET_MESH_ApplicationType apptypes[] =
1204 GNUNET_APPLICATION_TYPE_INTERNET_TCP_GATEWAY,
1205 GNUNET_APPLICATION_TYPE_INTERNET_UDP_GATEWAY,
1206 GNUNET_APPLICATION_TYPE_END
1209 mesh_handle = GNUNET_MESH_connect (cfg_, NULL, NULL, handlers, apptypes);
1212 udp_connections = GNUNET_CONTAINER_multihashmap_create (65536);
1213 udp_connections_heap =
1214 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1215 tcp_connections = GNUNET_CONTAINER_multihashmap_create (65536);
1216 tcp_connections_heap =
1217 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1218 udp_services = GNUNET_CONTAINER_multihashmap_create (65536);
1219 tcp_services = GNUNET_CONTAINER_multihashmap_create (65536);
1221 GNUNET_CONFIGURATION_get_value_number (cfg, "exit", "MAX_UDP_CONNECTIONS",
1222 &max_udp_connections);
1223 GNUNET_CONFIGURATION_get_value_number (cfg, "exit", "MAX_TCP_CONNECTIONS",
1224 &max_tcp_connections);
1227 GNUNET_CONFIGURATION_get_value_filename (cfg, "dns", "SERVICES", &services);
1228 servicecfg = GNUNET_CONFIGURATION_create ();
1229 if (GNUNET_OK == GNUNET_CONFIGURATION_parse (servicecfg, services))
1231 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Parsing services %s\n", services);
1232 GNUNET_CONFIGURATION_iterate (servicecfg, read_service_conf, NULL);
1234 if (NULL != services)
1235 GNUNET_free (services);
1237 GNUNET_SCHEDULER_add_now (start_helper_and_schedule, NULL);
1238 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &cleanup, cls);
1242 * The main function to obtain template from gnunetd.
1244 * @param argc number of arguments from the command line
1245 * @param argv command line arguments
1246 * @return 0 ok, 1 on error
1249 main (int argc, char *const *argv) {
1250 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
1251 GNUNET_GETOPT_OPTION_END
1254 return (GNUNET_OK ==
1255 GNUNET_PROGRAM_run (argc,
1258 gettext_noop ("help text"),
1259 options, &run, NULL)) ? ret : 1;
1262 /* end of gnunet-daemon-exit.c */