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 sizeof(unsigned int) of the hash
214 * build the hash out of the last 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-(sizeof(unsigned int) - 2)), (sizeof(unsigned int) - 2));
219 memset(((unsigned char*)hash)+sizeof(unsigned int), 0, sizeof(GNUNET_HashCode) - sizeof(unsigned int));
223 * cls is the pointer to a GNUNET_MessageHeader that is
224 * followed by the service-descriptor and the udp-packet that should be sent;
227 send_udp_to_peer_notify_callback (void *cls, size_t size, void *buf)
229 struct GNUNET_MessageHeader *hdr = cls;
230 GNUNET_assert (size >= ntohs (hdr->size));
231 memcpy (buf, hdr, ntohs (hdr->size));
232 size = ntohs(hdr->size);
238 * @brief Handles an UDP-Packet received from the helper.
240 * @param udp A pointer to the Packet
241 * @param dadr The IP-Destination-address
242 * @param addrlen The length of the address
243 * @param version 4 or 6
246 udp_from_helper (struct udp_pkt *udp, unsigned char *dadr, size_t addrlen,
247 unsigned int version)
249 struct redirect_info u_i;
250 struct GNUNET_MESH_Tunnel *tunnel;
252 struct GNUNET_MessageHeader *msg;
254 memset (&u_i, 0, sizeof (struct redirect_info));
256 memcpy (&u_i.addr, dadr, addrlen);
260 /* get tunnel and service-descriptor from this */
261 GNUNET_HashCode hash;
262 hash_redirect_info(&hash, &u_i, addrlen);
264 struct redirect_state *state =
265 GNUNET_CONTAINER_multihashmap_get (udp_connections, &hash);
267 /* Mark this connection as freshly used */
268 GNUNET_CONTAINER_heap_update_cost (udp_connections_heap, state->heap_node,
269 GNUNET_TIME_absolute_get ().abs_value);
271 tunnel = state->tunnel;
273 if (state->type == SERVICE)
275 /* check if spt == serv.remote if yes: set spt = serv.myport ("nat") */
276 if (ntohs (udp->spt) == state->serv->remote_port)
278 udp->spt = htons (state->serv->my_port);
282 /* otherwise the answer came from a different port (tftp does this)
283 * add this new port to the list of all services, so that the packets
284 * coming back from the client to this new port will be routed correctly
286 struct redirect_service *serv =
287 GNUNET_malloc (sizeof (struct redirect_service));
288 memcpy (serv, state->serv, sizeof (struct redirect_service));
289 serv->my_port = ntohs (udp->spt);
290 serv->remote_port = ntohs (udp->spt);
291 uint16_t *desc = alloca (sizeof (GNUNET_HashCode) + 2);
292 memcpy ((GNUNET_HashCode *) (desc + 1), &state->desc,
293 sizeof (GNUNET_HashCode));
294 *desc = ntohs (udp->spt);
295 GNUNET_assert (GNUNET_OK ==
296 GNUNET_CONTAINER_multihashmap_put (udp_services,
297 (GNUNET_HashCode*)desc, serv,
298 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
304 /* send udp-packet back */
306 sizeof (struct GNUNET_MessageHeader) + sizeof (GNUNET_HashCode) +
308 msg = GNUNET_malloc (len);
309 msg->size = htons (len);
310 msg->type = htons (state->type == SERVICE ? GNUNET_MESSAGE_TYPE_SERVICE_UDP_BACK : GNUNET_MESSAGE_TYPE_REMOTE_UDP_BACK);
311 GNUNET_HashCode *desc = (GNUNET_HashCode *) (msg + 1);
312 if (state->type == SERVICE)
313 memcpy (desc, &state->desc, sizeof (GNUNET_HashCode));
315 memcpy (desc, &state->remote, sizeof (struct remote_addr));
316 void *_udp = desc + 1;
317 memcpy (_udp, udp, ntohs (udp->len));
319 GNUNET_MESH_notify_transmit_ready (tunnel,
322 GNUNET_TIME_relative_divide
323 (GNUNET_CONSTANTS_MAX_CORK_DELAY, 2),
324 (const struct GNUNET_PeerIdentity *)
326 send_udp_to_peer_notify_callback, msg);
330 * @brief Handles a TCP-Packet received from the helper.
332 * @param tcp A pointer to the Packet
333 * @param dadr The IP-Destination-address
334 * @param addrlen The length of the address
335 * @param version 4 or 6
336 * @param pktlen the length of the packet, including its header
339 tcp_from_helper (struct tcp_pkt *tcp, unsigned char *dadr, size_t addrlen,
340 unsigned int version, size_t pktlen)
342 struct redirect_info u_i;
343 struct GNUNET_MESH_Tunnel *tunnel;
345 struct GNUNET_MessageHeader *msg;
347 memset (&u_i, 0, sizeof (struct redirect_info));
349 memcpy (&u_i.addr, dadr, addrlen);
352 /* get tunnel and service-descriptor from this */
353 GNUNET_HashCode hash;
354 hash_redirect_info(&hash, &u_i, addrlen);
356 struct redirect_state *state =
357 GNUNET_CONTAINER_multihashmap_get (tcp_connections, &hash);
359 /* Mark this connection as freshly used */
360 GNUNET_CONTAINER_heap_update_cost (tcp_connections_heap, state->heap_node,
361 GNUNET_TIME_absolute_get ().abs_value);
363 tunnel = state->tunnel;
365 if (state->type == SERVICE)
367 /* check if spt == serv.remote if yes: set spt = serv.myport ("nat") */
368 if (ntohs (tcp->spt) == state->serv->remote_port)
370 tcp->spt = htons (state->serv->my_port);
374 // This is an illegal packet.
379 /* send tcp-packet back */
381 sizeof (struct GNUNET_MessageHeader) + sizeof (GNUNET_HashCode) + pktlen;
382 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "len: %d\n", pktlen);
383 msg = GNUNET_malloc (len);
384 msg->size = htons (len);
385 msg->type = htons (state->type == SERVICE ? GNUNET_MESSAGE_TYPE_SERVICE_TCP_BACK : GNUNET_MESSAGE_TYPE_REMOTE_TCP_BACK);
386 GNUNET_HashCode *desc = (GNUNET_HashCode *) (msg + 1);
387 if (state->type == SERVICE)
388 memcpy (desc, &state->desc, sizeof (GNUNET_HashCode));
390 memcpy (desc, &state->remote, sizeof (struct remote_addr));
391 void *_tcp = desc + 1;
392 memcpy (_tcp, tcp, pktlen);
394 GNUNET_MESH_notify_transmit_ready (tunnel,
397 GNUNET_TIME_relative_divide
398 (GNUNET_CONSTANTS_MAX_CORK_DELAY, 2),
399 (const struct GNUNET_PeerIdentity *)NULL,
400 len, send_udp_to_peer_notify_callback,
406 * Receive packets from the helper-process
409 message_token (void *cls,
410 void *client, const struct GNUNET_MessageHeader *message)
412 GNUNET_assert (ntohs (message->type) == GNUNET_MESSAGE_TYPE_VPN_HELPER);
414 struct tun_pkt *pkt_tun = (struct tun_pkt *) message;
416 /* ethertype is ipv6 */
417 if (ntohs (pkt_tun->tun.type) == 0x86dd)
419 struct ip6_pkt *pkt6 = (struct ip6_pkt *) pkt_tun;
420 if (0x11 == pkt6->ip6_hdr.nxthdr)
421 udp_from_helper (&((struct ip6_udp *) pkt6)->udp_hdr,
422 (unsigned char *) &pkt6->ip6_hdr.dadr, 16, 6);
423 else if (0x06 == pkt6->ip6_hdr.nxthdr)
424 tcp_from_helper (&((struct ip6_tcp *) pkt6)->tcp_hdr,
425 (unsigned char *) &pkt6->ip6_hdr.dadr, 16, 6,
426 ntohs (pkt6->ip6_hdr.paylgth));
428 else if (ntohs (pkt_tun->tun.type) == 0x0800)
430 struct ip_pkt *pkt4 = (struct ip_pkt *) pkt_tun;
431 uint32_t tmp = pkt4->ip_hdr.dadr;
432 if (0x11 == pkt4->ip_hdr.proto)
433 udp_from_helper (&((struct ip_udp *) pkt4)->udp_hdr,
434 (unsigned char *) &tmp, 4, 4);
435 else if (0x06 == pkt4->ip_hdr.proto)
437 size_t pktlen = ntohs(pkt4->ip_hdr.tot_lngth);
438 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "tot: %d\n", pktlen);
439 pktlen -= 4*pkt4->ip_hdr.hdr_lngth;
440 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "-hdr: %d\n", pktlen);
441 tcp_from_helper (&((struct ip_tcp *) pkt4)->tcp_hdr,
442 (unsigned char *) &tmp, 4, 4, pktlen);
452 * Reads the configuration servicecfg and populates udp_services
455 * @param section name of section in config, equal to hostname
456 * @param option type of redirect
457 * @param value specification of services, format is
458 * "OFFERED-PORT:HOSTNAME:HOST-PORT" (SPACE <more of those>)*
461 read_service_conf (void *cls, const char *section, const char *option,
468 GNUNET_HashCode hash;
469 uint16_t *desc = alloca (sizeof (GNUNET_HashCode) + 2);
470 GNUNET_CRYPTO_hash (section, strlen (section) + 1,
471 (GNUNET_HashCode *) (desc + 1));
477 if (0 == strcmp ("UDP_REDIRECTS", option))
479 else if (0 == strcmp ("TCP_REDIRECTS", option))
486 cpy = GNUNET_strdup (value);
487 for (redirect = strtok (cpy, " "); redirect != NULL; redirect = strtok
490 if (NULL == (hostname = strstr (redirect, ":")))
492 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Warning: option %s is not formatted correctly!\n",
498 if (NULL == (hostport = strstr (hostname, ":")))
500 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Warning: option %s is not formatted correctly!\n",
507 int local_port = atoi (redirect);
508 if (!((local_port > 0) && (local_port < 65536)))
509 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Warning: %s is not a correct port.",
514 struct redirect_service *serv =
515 GNUNET_malloc (sizeof (struct redirect_service));
516 memset (serv, 0, sizeof (struct redirect_service));
517 serv->my_port = local_port;
519 if (0 == strcmp ("localhost4", hostname))
524 GNUNET_assert (GNUNET_OK ==
525 GNUNET_CONFIGURATION_get_value_string (cfg,
530 inet_pton (AF_INET, ip4addr,
531 serv->v4.ip4address));
532 GNUNET_free (ip4addr);
534 else if (0 == strcmp ("localhost6", hostname))
539 GNUNET_assert (GNUNET_OK ==
540 GNUNET_CONFIGURATION_get_value_string (cfg,
545 inet_pton (AF_INET6, ip6addr,
546 serv->v6.ip6address));
547 GNUNET_free (ip6addr);
551 // TODO Lookup, yadayadayada
554 serv->remote_port = atoi (hostport);
555 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Store with key1 %x\n",
556 *((unsigned long long *) (desc + 1)));
557 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Store with key2 %x\n",
558 *((unsigned long long *) &hash));
560 GNUNET_assert (GNUNET_OK ==
561 GNUNET_CONTAINER_multihashmap_put (udp_services,
562 (GNUNET_HashCode*)desc, serv,
563 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
565 GNUNET_assert (GNUNET_OK ==
566 GNUNET_CONTAINER_multihashmap_put (tcp_services,
567 (GNUNET_HashCode*)desc, serv,
568 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
576 * Start the helper-process
578 * If cls != NULL it is assumed that this function is called as a result of a dying
579 * helper. cls is then taken as handle to the old helper and is cleaned up.
582 start_helper_and_schedule(void *cls,
583 const struct GNUNET_SCHEDULER_TaskContext *tc) {
584 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
597 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string(cfg, "exit", "IFNAME", &ifname))
599 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "No entry 'IFNAME' in configuration!\n");
603 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string(cfg, "exit", "IPV6ADDR", &ipv6addr))
605 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "No entry 'IPV6ADDR' in configuration!\n");
609 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string(cfg, "exit", "IPV6PREFIX", &ipv6prefix))
611 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "No entry 'IPV6PREFIX' in configuration!\n");
615 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string(cfg, "exit", "IPV4ADDR", &ipv4addr))
617 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "No entry 'IPV4ADDR' in configuration!\n");
621 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string(cfg, "exit", "IPV4MASK", &ipv4mask))
623 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "No entry 'IPV4MASK' in configuration!\n");
628 * Messages get passed to the function message_token
629 * When the helper dies, this function will be called again with the
630 * helper_handle as cls.
632 helper_handle = start_helper(ifname,
638 start_helper_and_schedule,
643 GNUNET_free(ipv6addr);
644 GNUNET_free(ipv6prefix);
645 GNUNET_free(ipv4addr);
646 GNUNET_free(ipv4mask);
651 prepare_ipv4_packet (ssize_t len, ssize_t pktlen, void *payload,
652 uint16_t protocol, void *ipaddress, void *tunnel,
653 struct redirect_state *state, struct ip_pkt *pkt4)
657 pkt4->shdr.type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
658 pkt4->shdr.size = htons (len);
660 pkt4->tun.type = htons (0x0800);
662 memcpy (&pkt4->data, payload, pktlen);
664 pkt4->ip_hdr.version = 4;
665 pkt4->ip_hdr.hdr_lngth = 5;
666 pkt4->ip_hdr.diff_serv = 0;
667 pkt4->ip_hdr.tot_lngth = htons (20 + pktlen);
668 pkt4->ip_hdr.ident = 0;
669 pkt4->ip_hdr.flags = 0;
670 pkt4->ip_hdr.frag_off = 0;
671 pkt4->ip_hdr.ttl = 255;
672 pkt4->ip_hdr.proto = protocol;
673 pkt4->ip_hdr.chks = 0; /* Will be calculated later */
675 memcpy (&tmp, ipaddress, 4);
676 pkt4->ip_hdr.dadr = tmp;
678 /* Generate a new src-address */
681 GNUNET_assert (GNUNET_OK ==
682 GNUNET_CONFIGURATION_get_value_string (cfg, "exit",
685 GNUNET_assert (GNUNET_OK ==
686 GNUNET_CONFIGURATION_get_value_string (cfg, "exit",
689 inet_pton (AF_INET, ipv4addr, &tmp);
690 inet_pton (AF_INET, ipv4mask, &tmp2);
691 GNUNET_free (ipv4addr);
692 GNUNET_free (ipv4mask);
694 /* This should be a noop */
697 tmp |= ntohl (*((uint32_t *) tunnel)) & (~tmp2);
699 pkt4->ip_hdr.sadr = tmp;
701 memcpy (&state->redirect_info.addr, &tmp, 4);
702 if (0x11 == protocol)
704 struct ip_udp* pkt4_udp = (struct ip_udp*)pkt4;
705 state->redirect_info.pt = pkt4_udp->udp_hdr.spt;
707 pkt4_udp->udp_hdr.crc = 0; /* Optional for IPv4 */
709 else if (0x06 == protocol)
711 struct ip_tcp* pkt4_tcp = (struct ip_tcp*)pkt4;
712 state->redirect_info.pt = pkt4_tcp->tcp_hdr.spt;
714 pkt4_tcp->tcp_hdr.crc = 0;
716 tmp = pkt4->ip_hdr.sadr;
718 calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
719 tmp = pkt4->ip_hdr.dadr;
721 calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
723 tmp = (protocol << 16) | (0xffff & pktlen);
725 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "line: %08x, %x \n", tmp, (0xffff & pktlen));
729 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
732 calculate_checksum_update (sum, (uint16_t *) & pkt4_tcp->tcp_hdr, pktlen);
733 pkt4_tcp->tcp_hdr.crc = calculate_checksum_end (sum);
737 calculate_ip_checksum ((uint16_t *) & pkt4->ip_hdr, 5 * 4);
741 prepare_ipv6_packet (ssize_t len, ssize_t pktlen, void *payload,
742 uint16_t protocol, void *ipaddress, void *tunnel,
743 struct redirect_state *state, struct ip6_pkt *pkt6)
747 pkt6->shdr.type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
748 pkt6->shdr.size = htons (len);
751 pkt6->tun.type = htons (0x86dd);
753 memcpy (&pkt6->data, payload, pktlen);
755 pkt6->ip6_hdr.version = 6;
756 pkt6->ip6_hdr.nxthdr = protocol;
757 pkt6->ip6_hdr.paylgth = htons (pktlen);
758 pkt6->ip6_hdr.hoplmt = 64;
760 memcpy (pkt6->ip6_hdr.dadr, ipaddress, 16);
762 /* Generate a new src-address
763 * This takes as much from the address of the tunnel as fits into
766 unsigned long long ipv6prefix;
767 GNUNET_assert (GNUNET_OK ==
768 GNUNET_CONFIGURATION_get_value_string (cfg, "exit",
771 GNUNET_assert (GNUNET_OK ==
772 GNUNET_CONFIGURATION_get_value_number (cfg, "exit",
775 GNUNET_assert (ipv6prefix < 127);
776 ipv6prefix = (ipv6prefix + 7) / 8;
778 inet_pton (AF_INET6, ipv6addr, &pkt6->ip6_hdr.sadr);
779 GNUNET_free (ipv6addr);
781 if (ipv6prefix < (16 - sizeof (void *)))
782 ipv6prefix = 16 - sizeof (void *);
784 unsigned int offset = ipv6prefix - (16 - sizeof (void *));
785 memcpy ((((char *) &pkt6->ip6_hdr.sadr)) + ipv6prefix,
786 ((char *) &tunnel) + offset, 16 - ipv6prefix);
788 /* copy the needed information into the state */
789 memcpy (&state->redirect_info.addr, &pkt6->ip6_hdr.sadr, 16);
791 if (0x11 == protocol)
793 struct ip6_udp* pkt6_udp = (struct ip6_udp*)pkt6;
794 state->redirect_info.pt = pkt6_udp->udp_hdr.spt;
796 pkt6_udp->udp_hdr.crc = 0;
799 calculate_checksum_update (sum, (uint16_t *) & pkt6_udp->ip6_hdr.sadr, 16);
801 calculate_checksum_update (sum, (uint16_t *) & pkt6_udp->ip6_hdr.dadr, 16);
802 tmp = (htons (pktlen) & 0xffff);
803 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
804 tmp = htons (((pkt6_udp->ip6_hdr.nxthdr & 0x00ff)));
805 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
808 calculate_checksum_update (sum, (uint16_t *) & pkt6_udp->udp_hdr,
809 ntohs (pkt6_udp->udp_hdr.len));
810 pkt6_udp->udp_hdr.crc = calculate_checksum_end (sum);
812 else if (0x06 == protocol)
814 struct ip6_tcp* pkt6_tcp = (struct ip6_tcp*)pkt6;
815 state->redirect_info.pt = pkt6_tcp->tcp_hdr.spt;
817 pkt6_tcp->tcp_hdr.crc = 0;
820 calculate_checksum_update (sum, (uint16_t *) & pkt6->ip6_hdr.sadr, 16);
822 calculate_checksum_update (sum, (uint16_t *) & pkt6->ip6_hdr.dadr, 16);
824 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
825 tmp = htonl (((pkt6->ip6_hdr.nxthdr & 0x000000ff)));
826 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
829 calculate_checksum_update (sum, (uint16_t *) & pkt6_tcp->tcp_hdr,
830 ntohs (pkt6->ip6_hdr.paylgth));
831 pkt6_tcp->tcp_hdr.crc = calculate_checksum_end (sum);
836 * The messages are one GNUNET_HashCode for the service followed by a struct tcp_pkt
839 receive_tcp_service (void *cls,
840 struct GNUNET_MESH_Tunnel *tunnel,
842 const struct GNUNET_PeerIdentity *sender,
843 const struct GNUNET_MessageHeader *message,
844 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
846 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received TCP-Packet\n");
847 GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
848 struct tcp_pkt *pkt = (struct tcp_pkt *) (desc + 1);
849 unsigned int pkt_len = ntohs (message->size) - sizeof (struct
850 GNUNET_MessageHeader)
851 - sizeof (GNUNET_HashCode);
853 /** Get the configuration from the services-hashmap.
855 * Which service is needed only depends on the service-descriptor and the
858 uint16_t *tcp_desc = alloca (sizeof (GNUNET_HashCode) + 2);
860 memcpy (tcp_desc + 1, desc, sizeof (GNUNET_HashCode));
861 *tcp_desc = ntohs (pkt->dpt);
862 struct redirect_service *serv =
863 GNUNET_CONTAINER_multihashmap_get (tcp_services, (GNUNET_HashCode*)tcp_desc);
866 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
867 "No service found for TCP dpt %d!\n", *tcp_desc);
871 pkt->dpt = htons (serv->remote_port);
874 * At this point it would be possible to check against some kind of ACL.
880 /* Prepare the state.
881 * This will be saved in the hashmap, so that the receiving procedure knows
882 * through which tunnel this connection has to be routed.
884 struct redirect_state *state =
885 GNUNET_malloc (sizeof (struct redirect_state));
886 memset (state, 0, sizeof (struct redirect_state));
887 state->tunnel = tunnel;
889 state->type = SERVICE;
890 state->hashmap = tcp_connections;
891 memcpy (&state->desc, desc, sizeof (GNUNET_HashCode));
893 len = sizeof (struct GNUNET_MessageHeader) + sizeof (struct pkt_tun) +
894 sizeof (struct ip6_hdr) + pkt_len;
897 memset (buf, 0, len);
899 switch (serv->version)
902 prepare_ipv4_packet (len, pkt_len, pkt, 0x06, /* TCP */
903 &serv->v4.ip4address,
904 tunnel, state, (struct ip_pkt *) buf);
907 prepare_ipv6_packet (len, pkt_len, pkt, 0x06, /* TCP */
908 &serv->v6.ip6address,
909 tunnel, state, (struct ip6_pkt *) buf);
917 hash_redirect_info(&state->hash, &state->redirect_info, serv->version == 4 ? 4 : 16);
920 GNUNET_CONTAINER_multihashmap_contains (tcp_connections, &state->hash))
922 GNUNET_CONTAINER_multihashmap_put (tcp_connections, &state->hash, state,
923 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
926 GNUNET_CONTAINER_heap_insert (tcp_connections_heap, state,
927 GNUNET_TIME_absolute_get ().abs_value);
929 if (GNUNET_CONTAINER_heap_get_size(tcp_connections_heap) > max_tcp_connections)
930 GNUNET_SCHEDULER_add_now(collect_connections, tcp_connections_heap);
935 (void) GNUNET_DISK_file_write (helper_handle->fh_to_helper, buf, len);
940 receive_tcp_remote (void *cls,
941 struct GNUNET_MESH_Tunnel *tunnel,
943 const struct GNUNET_PeerIdentity *sender,
944 const struct GNUNET_MessageHeader *message,
945 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
947 GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
948 struct udp_pkt *pkt = (struct udp_pkt *) (desc + 1);
949 struct remote_addr *s = (struct remote_addr *) desc;
952 unsigned int pkt_len = ntohs (message->size) - sizeof (struct GNUNET_MessageHeader) - sizeof (GNUNET_HashCode);
954 struct redirect_state *state =
955 GNUNET_malloc (sizeof (struct redirect_state));
956 memset (state, 0, sizeof (struct redirect_state));
957 state->tunnel = tunnel;
958 state->type = REMOTE;
959 state->hashmap = tcp_connections;
960 memcpy (&state->remote, s, sizeof (struct remote_addr));
962 len = sizeof (struct GNUNET_MessageHeader) + sizeof (struct pkt_tun) +
963 sizeof (struct ip6_hdr) + pkt_len;
966 memset (buf, 0, len);
971 prepare_ipv4_packet (len, ntohs (pkt->len), pkt, 0x06, /* TCP */
972 &s->addr, tunnel, state, (struct ip_pkt *) buf);
975 prepare_ipv6_packet (len, ntohs (pkt->len), pkt, 0x06, /* TCP */
976 &s->addr, tunnel, state, (struct ip6_pkt *) buf);
983 hash_redirect_info (&state->hash, &state->redirect_info, s->addrlen);
986 GNUNET_CONTAINER_multihashmap_contains (udp_connections, &state->hash))
988 GNUNET_CONTAINER_multihashmap_put (udp_connections, &state->hash, state,
989 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
992 GNUNET_CONTAINER_heap_insert (udp_connections_heap, state,
993 GNUNET_TIME_absolute_get ().abs_value);
995 if (GNUNET_CONTAINER_heap_get_size (udp_connections_heap) >
997 GNUNET_SCHEDULER_add_now (collect_connections, udp_connections_heap);
1000 GNUNET_free (state);
1002 (void) GNUNET_DISK_file_write (helper_handle->fh_to_helper, buf, len);
1008 receive_udp_remote (void *cls,
1009 struct GNUNET_MESH_Tunnel *tunnel,
1011 const struct GNUNET_PeerIdentity *sender,
1012 const struct GNUNET_MessageHeader *message,
1013 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1015 GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
1016 struct udp_pkt *pkt = (struct udp_pkt *) (desc + 1);
1017 struct remote_addr *s = (struct remote_addr *) desc;
1021 GNUNET_assert (ntohs (pkt->len) ==
1022 ntohs (message->size) -
1023 sizeof (struct GNUNET_MessageHeader) -
1024 sizeof (GNUNET_HashCode));
1026 /* Prepare the state.
1027 * This will be saved in the hashmap, so that the receiving procedure knows
1028 * through which tunnel this connection has to be routed.
1030 struct redirect_state *state =
1031 GNUNET_malloc (sizeof (struct redirect_state));
1032 memset (state, 0, sizeof (struct redirect_state));
1033 state->tunnel = tunnel;
1034 state->hashmap = udp_connections;
1035 state->type = REMOTE;
1036 memcpy (&state->remote, s, sizeof (struct remote_addr));
1038 len = sizeof (struct GNUNET_MessageHeader) + sizeof (struct pkt_tun) +
1039 sizeof (struct ip6_hdr) + ntohs (pkt->len);
1042 memset (buf, 0, len);
1047 prepare_ipv4_packet (len, ntohs (pkt->len), pkt, 0x11, /* UDP */
1048 &s->addr, tunnel, state, (struct ip_pkt *) buf);
1051 prepare_ipv6_packet (len, ntohs (pkt->len), pkt, 0x11, /* UDP */
1052 &s->addr, tunnel, state, (struct ip6_pkt *) buf);
1059 hash_redirect_info (&state->hash, &state->redirect_info, s->addrlen);
1062 GNUNET_CONTAINER_multihashmap_contains (udp_connections, &state->hash))
1064 GNUNET_CONTAINER_multihashmap_put (udp_connections, &state->hash, state,
1065 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1068 GNUNET_CONTAINER_heap_insert (udp_connections_heap, state,
1069 GNUNET_TIME_absolute_get ().abs_value);
1071 if (GNUNET_CONTAINER_heap_get_size (udp_connections_heap) >
1072 max_udp_connections)
1073 GNUNET_SCHEDULER_add_now (collect_connections, udp_connections_heap);
1076 GNUNET_free (state);
1078 (void) GNUNET_DISK_file_write (helper_handle->fh_to_helper, buf, len);
1083 * The messages are one GNUNET_HashCode for the service, followed by a struct udp_pkt
1086 receive_udp_service (void *cls,
1087 struct GNUNET_MESH_Tunnel *tunnel,
1089 const struct GNUNET_PeerIdentity *sender,
1090 const struct GNUNET_MessageHeader *message,
1091 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1093 GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
1094 struct udp_pkt *pkt = (struct udp_pkt *) (desc + 1);
1096 GNUNET_assert (ntohs (pkt->len) ==
1097 ntohs (message->size) -
1098 sizeof (struct GNUNET_MessageHeader) -
1099 sizeof (GNUNET_HashCode));
1101 /* Get the configuration from the hashmap */
1102 uint16_t *udp_desc = alloca (sizeof (GNUNET_HashCode) + 2);
1103 memcpy (udp_desc + 1, desc, sizeof (GNUNET_HashCode));
1104 *udp_desc = ntohs (pkt->dpt);
1105 struct redirect_service *serv =
1106 GNUNET_CONTAINER_multihashmap_get (udp_services, (GNUNET_HashCode*)udp_desc);
1109 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1110 "No service found for UDP dpt %d!\n", *udp_desc);
1114 pkt->dpt = htons (serv->remote_port);
1117 * At this point it would be possible to check against some kind of ACL.
1123 /* Prepare the state.
1124 * This will be saved in the hashmap, so that the receiving procedure knows
1125 * through which tunnel this connection has to be routed.
1127 struct redirect_state *state =
1128 GNUNET_malloc (sizeof (struct redirect_state));
1129 memset (state, 0, sizeof (struct redirect_state));
1130 state->tunnel = tunnel;
1132 state->type = SERVICE;
1133 state->hashmap = udp_connections;
1134 memcpy (&state->desc, desc, sizeof (GNUNET_HashCode));
1136 len = sizeof (struct GNUNET_MessageHeader) + sizeof (struct pkt_tun) +
1137 sizeof (struct ip6_hdr) + ntohs (pkt->len);
1140 memset (buf, 0, len);
1142 switch (serv->version)
1145 prepare_ipv4_packet (len, ntohs (pkt->len), pkt, 0x11, /* UDP */
1146 &serv->v4.ip4address,
1147 tunnel, state, (struct ip_pkt *) buf);
1150 prepare_ipv6_packet (len, ntohs (pkt->len), pkt, 0x11, /* UDP */
1151 &serv->v6.ip6address,
1152 tunnel, state, (struct ip6_pkt *) buf);
1160 hash_redirect_info(&state->hash, &state->redirect_info, serv->version == 4 ? 4 : 16);
1163 GNUNET_CONTAINER_multihashmap_contains (udp_connections, &state->hash))
1165 GNUNET_CONTAINER_multihashmap_put (udp_connections, &state->hash, state,
1166 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1169 GNUNET_CONTAINER_heap_insert (udp_connections_heap, state,
1170 GNUNET_TIME_absolute_get ().abs_value);
1172 if (GNUNET_CONTAINER_heap_get_size(udp_connections_heap) > max_udp_connections)
1173 GNUNET_SCHEDULER_add_now(collect_connections, udp_connections_heap);
1176 GNUNET_free (state);
1178 (void) GNUNET_DISK_file_write (helper_handle->fh_to_helper, buf, len);
1183 * @brief Main function that will be run by the scheduler.
1185 * @param cls closure
1186 * @param args remaining command-line arguments
1187 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
1188 * @param cfg_ configuration
1193 const char *cfgfile, const struct GNUNET_CONFIGURATION_Handle *cfg_)
1195 const static struct GNUNET_MESH_MessageHandler handlers[] = {
1196 {receive_udp_service, GNUNET_MESSAGE_TYPE_SERVICE_UDP, 0},
1197 {receive_tcp_service, GNUNET_MESSAGE_TYPE_SERVICE_TCP, 0},
1198 {receive_udp_remote, GNUNET_MESSAGE_TYPE_REMOTE_UDP, 0},
1199 {receive_tcp_remote, GNUNET_MESSAGE_TYPE_REMOTE_TCP, 0},
1203 const static GNUNET_MESH_ApplicationType apptypes[] =
1205 GNUNET_APPLICATION_TYPE_INTERNET_TCP_GATEWAY,
1206 GNUNET_APPLICATION_TYPE_INTERNET_UDP_GATEWAY,
1207 GNUNET_APPLICATION_TYPE_END
1210 mesh_handle = GNUNET_MESH_connect (cfg_, NULL, NULL, handlers, apptypes);
1213 udp_connections = GNUNET_CONTAINER_multihashmap_create (65536);
1214 udp_connections_heap =
1215 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1216 tcp_connections = GNUNET_CONTAINER_multihashmap_create (65536);
1217 tcp_connections_heap =
1218 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1219 udp_services = GNUNET_CONTAINER_multihashmap_create (65536);
1220 tcp_services = GNUNET_CONTAINER_multihashmap_create (65536);
1222 GNUNET_CONFIGURATION_get_value_number (cfg, "exit", "MAX_UDP_CONNECTIONS",
1223 &max_udp_connections);
1224 GNUNET_CONFIGURATION_get_value_number (cfg, "exit", "MAX_TCP_CONNECTIONS",
1225 &max_tcp_connections);
1228 GNUNET_CONFIGURATION_get_value_filename (cfg, "dns", "SERVICES", &services);
1229 servicecfg = GNUNET_CONFIGURATION_create ();
1230 if (GNUNET_OK == GNUNET_CONFIGURATION_parse (servicecfg, services))
1232 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Parsing services %s\n", services);
1233 GNUNET_CONFIGURATION_iterate (servicecfg, read_service_conf, NULL);
1235 if (NULL != services)
1236 GNUNET_free (services);
1238 GNUNET_SCHEDULER_add_now (start_helper_and_schedule, NULL);
1239 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &cleanup, cls);
1243 * The main function to obtain template from gnunetd.
1245 * @param argc number of arguments from the command line
1246 * @param argv command line arguments
1247 * @return 0 ok, 1 on error
1250 main (int argc, char *const *argv) {
1251 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
1252 GNUNET_GETOPT_OPTION_END
1255 return (GNUNET_OK ==
1256 GNUNET_PROGRAM_run (argc,
1259 gettext_noop ("help text"),
1260 options, &run, NULL)) ? ret : 1;
1263 /* end of gnunet-daemon-exit.c */