2 This file is part of GNUnet.
3 (C) 2010 Christian Grothoff
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file vpn/gnunet-daemon-vpn.c
24 * @author Philipp Toelke
27 #include "gnunet_getopt_lib.h"
28 #include "gnunet_program_lib.h"
29 #include "gnunet-vpn-packet.h"
30 #include "gnunet_common.h"
31 #include "gnunet_protocols.h"
32 #include <gnunet_mesh_service.h>
33 #include "gnunet_client_lib.h"
34 #include "gnunet_container_lib.h"
35 #include "gnunet_constants.h"
36 #include <block_dns.h>
37 #include "gnunet-daemon-vpn-helper.h"
38 #include "gnunet-daemon-vpn-dns.h"
39 #include "gnunet-daemon-vpn.h"
40 #include "gnunet-vpn-checksum.h"
42 const struct GNUNET_CONFIGURATION_Handle *cfg;
43 struct GNUNET_MESH_Handle *mesh_handle;
44 struct GNUNET_CONTAINER_MultiHashMap* hashmap;
45 static struct GNUNET_CONTAINER_Heap *heap;
48 * If there are at least this many address-mappings, old ones will be removed
50 static long long unsigned int max_mappings = 200;
58 * This hashmap contains the mapping from peer, service-descriptor,
59 * source-port and destination-port to a socket
61 static struct GNUNET_CONTAINER_MultiHashMap *udp_connections;
64 * Function scheduled as very last function, cleans up after us
68 cleanup(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tskctx) {
69 GNUNET_assert (0 != (tskctx->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN));
72 cleanup_helper(helper_handle);
74 /* close the connection to the service-dns */
75 if (dns_connection != NULL)
77 GNUNET_CLIENT_disconnect (dns_connection, GNUNET_NO);
78 dns_connection = NULL;
81 if (mesh_handle != NULL)
83 GNUNET_MESH_disconnect(mesh_handle);
90 * @return the hash of the IP-Address if a mapping exists, NULL otherwise
93 address_mapping_exists(unsigned char addr[]) {
94 GNUNET_HashCode* key = GNUNET_malloc(sizeof(GNUNET_HashCode));
95 unsigned char* k = (unsigned char*)key;
96 memset(key, 0, sizeof(GNUNET_HashCode));
98 for (i = 0; i < 16; i++)
101 if (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains(hashmap, key))
111 collect_mappings(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tc) {
112 if ( (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
115 struct map_entry* me = GNUNET_CONTAINER_heap_remove_root(heap);
117 /* This is free()ed memory! */
118 me->heap_node = NULL;
120 /* FIXME! GNUNET_MESH_close_tunnel(me->tunnel); */
122 GNUNET_CONTAINER_multihashmap_remove(hashmap, &me->hash, me);
128 send_icmp_response(void* cls, const struct GNUNET_SCHEDULER_TaskContext *tc) {
129 struct ip6_icmp* request = cls;
131 struct ip6_icmp* response = alloca(ntohs(request->shdr.size));
132 GNUNET_assert(response != NULL);
133 memset(response, 0, ntohs(request->shdr.size));
135 response->shdr.size = request->shdr.size;
136 response->shdr.type = htons(GNUNET_MESSAGE_TYPE_VPN_HELPER);
138 response->tun.flags = 0;
139 response->tun.type = htons(0x86dd);
141 response->ip6_hdr.hoplmt = 255;
142 response->ip6_hdr.paylgth = request->ip6_hdr.paylgth;
143 response->ip6_hdr.nxthdr = 0x3a;
144 response->ip6_hdr.version = 6;
145 memcpy(&response->ip6_hdr.sadr, &request->ip6_hdr.dadr, 16);
146 memcpy(&response->ip6_hdr.dadr, &request->ip6_hdr.sadr, 16);
148 response->icmp_hdr.code = 0;
149 response->icmp_hdr.type = 0x81;
151 /* Magic, more Magic! */
152 response->icmp_hdr.chks = request->icmp_hdr.chks - 0x1;
154 /* Copy the rest of the packet */
155 memcpy(response+1, request+1, ntohs(request->shdr.size) - sizeof(struct ip6_icmp));
157 write_to_helper(response, ntohs(response->shdr.size));
159 GNUNET_free(request);
163 * cls is the pointer to a GNUNET_MessageHeader that is
164 * followed by the service-descriptor and the packet that should be sent;
167 send_pkt_to_peer_notify_callback (void *cls, size_t size, void *buf)
169 struct GNUNET_MESH_Tunnel **tunnel = cls;
170 struct GNUNET_MessageHeader *hdr =
171 (struct GNUNET_MessageHeader *) (tunnel + 1);
172 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "send_pkt_to_peer_notify_callback: buf = %x; size = %u;\n", buf, size);
173 GNUNET_assert (size >= ntohs (hdr->size));
174 memcpy (buf, hdr, ntohs (hdr->size));
175 size = ntohs(hdr->size);
177 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sent!\n");
182 port_in_ports (uint64_t ports, uint16_t port)
184 uint16_t *ps = (uint16_t *) & ports;
185 return ps[0] == port || ps[1] == port || ps[2] == port || ps[3] == port;
189 send_pkt_to_peer (void *cls,
190 const struct GNUNET_PeerIdentity *peer,
191 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
193 /* peer == NULL means that all peers in this request are connected */
194 if (peer == NULL) return;
195 struct GNUNET_MESH_Tunnel **tunnel = cls;
196 struct GNUNET_MessageHeader *hdr =
197 (struct GNUNET_MessageHeader *) (tunnel + 1);
199 GNUNET_assert(NULL != tunnel);
200 GNUNET_assert(NULL != *tunnel);
202 GNUNET_MESH_notify_transmit_ready (*tunnel,
205 GNUNET_TIME_relative_divide(GNUNET_CONSTANTS_MAX_CORK_DELAY, 2),
206 (const struct GNUNET_PeerIdentity *)NULL,
208 send_pkt_to_peer_notify_callback,
213 * Create a new Address from an answer-packet
216 new_ip6addr(unsigned char* buf, const GNUNET_HashCode *peer, const GNUNET_HashCode *service_desc) { /* {{{ */
218 unsigned long long ipv6prefix;
219 GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_string(cfg, "vpn", "IPV6ADDR", &ipv6addr));
220 GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_number(cfg, "vpn", "IPV6PREFIX", &ipv6prefix));
221 GNUNET_assert(ipv6prefix < 127);
222 ipv6prefix = (ipv6prefix + 7)/8;
224 inet_pton (AF_INET6, ipv6addr, buf);
225 GNUNET_free(ipv6addr);
227 int peer_length = 16 - ipv6prefix - 6;
228 if (peer_length <= 0)
231 int service_length = 16 - ipv6prefix - peer_length;
232 if (service_length <= 0)
235 memcpy(buf+ipv6prefix, service_desc, service_length);
236 memcpy(buf+ipv6prefix+service_length, peer, peer_length);
242 * Create a new Address from an answer-packet
245 new_ip6addr_remote (unsigned char *buf, unsigned char *addr, char addrlen)
248 unsigned long long ipv6prefix;
249 GNUNET_assert (GNUNET_OK ==
250 GNUNET_CONFIGURATION_get_value_string (cfg, "vpn",
253 GNUNET_assert (GNUNET_OK ==
254 GNUNET_CONFIGURATION_get_value_number (cfg, "vpn",
257 GNUNET_assert (ipv6prefix < 127);
258 ipv6prefix = (ipv6prefix + 7) / 8;
260 inet_pton (AF_INET6, ipv6addr, buf);
261 GNUNET_free (ipv6addr);
263 int local_length = 16 - ipv6prefix;
265 memcpy (buf + ipv6prefix, addr, GNUNET_MAX (addrlen, local_length));
270 * This gets scheduled with cls pointing to an answer_packet and does everything
271 * needed in order to send it to the helper.
273 * At the moment this means "inventing" and IPv6-Address for .gnunet-services and
274 * doing nothing for "real" services.
277 process_answer(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tc) {
278 struct answer_packet* pkt = cls;
279 struct answer_packet_list* list;
281 /* This answer is about a .gnunet-service
283 * It contains an almost complete DNS-Response, we have to fill in the ip
284 * at the offset pkt->addroffset
286 if (pkt->subtype == GNUNET_DNS_ANSWER_TYPE_SERVICE)
288 pkt->subtype = GNUNET_DNS_ANSWER_TYPE_IP;
291 memset(&key, 0, sizeof(GNUNET_HashCode));
293 unsigned char* c = ((unsigned char*)pkt)+ntohs(pkt->addroffset);
294 unsigned char* k = (unsigned char*)&key;
295 new_ip6addr(c, &pkt->service_descr.peer, &pkt->service_descr.service_descriptor);
297 * Copy the newly generated ip-address to the key backwarts (as only the first part is hashed)
300 for (i = 0; i < 16; i++)
303 uint16_t namelen = strlen((char*)pkt->data+12)+1;
305 struct map_entry* value = GNUNET_malloc(sizeof(struct map_entry) + namelen);
306 char* name = (char*)(value +1);
308 value->namelen = namelen;
309 memcpy(name, pkt->data+12, namelen);
311 memcpy(&value->desc, &pkt->service_descr, sizeof(struct GNUNET_vpn_service_descriptor));
313 memset(value->additional_ports, 0, 8192);
315 memcpy(&value->hash, &key, sizeof(GNUNET_HashCode));
318 GNUNET_CONTAINER_multihashmap_contains (hashmap, &key))
320 GNUNET_CONTAINER_multihashmap_put (hashmap, &key, value,
321 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
323 value->heap_node = GNUNET_CONTAINER_heap_insert (heap, value,
324 GNUNET_TIME_absolute_get ().abs_value);
325 if (GNUNET_CONTAINER_heap_get_size(heap) > max_mappings)
326 GNUNET_SCHEDULER_add_now(collect_mappings, NULL);
332 list = GNUNET_malloc(htons(pkt->hdr.size) + 2*sizeof(struct answer_packet_list*));
334 memcpy(&list->pkt, pkt, htons(pkt->hdr.size));
337 else if (pkt->subtype == GNUNET_DNS_ANSWER_TYPE_REV)
340 memset(&key, 0, sizeof key);
341 unsigned char* k = (unsigned char*)&key;
342 unsigned char* s = pkt->data+12;
344 /* Whoever designed the reverse IPv6-lookup is batshit insane */
345 for (i = 0; i < 16; i++)
347 unsigned char c1 = s[(4*i)+1];
348 unsigned char c2 = s[(4*i)+3];
352 k[i] = c1 - 87; /* 87 is the difference between 'a' and 10 */
354 k[i] += 16*(c2 - '0');
356 k[i] += 16*(c2 - 87);
359 struct map_entry* map_entry = GNUNET_CONTAINER_multihashmap_get(hashmap, &key);
360 GNUNET_CONTAINER_heap_update_cost (heap, map_entry->heap_node,
361 GNUNET_TIME_absolute_get ().abs_value);
363 uint16_t offset = ntohs(pkt->addroffset);
365 if (map_entry == NULL)
371 unsigned short namelen = htons(map_entry->namelen);
372 char* name = (char*)(map_entry + 1);
374 list = GNUNET_malloc(2*sizeof(struct answer_packet_list*) + offset + 2 + ntohs(namelen));
376 struct answer_packet* rpkt = &list->pkt;
378 /* The offset points to the first byte belonging to the address */
379 memcpy(rpkt, pkt, offset - 1);
381 rpkt->subtype = GNUNET_DNS_ANSWER_TYPE_IP;
382 rpkt->hdr.size = ntohs(offset + 2 + ntohs(namelen));
384 memcpy(((char*)rpkt)+offset, &namelen, 2);
385 memcpy(((char*)rpkt)+offset+2, name, ntohs(namelen));
388 else if (pkt->subtype == GNUNET_DNS_ANSWER_TYPE_IP)
390 list = GNUNET_malloc(htons(pkt->hdr.size) + 2*sizeof(struct answer_packet_list*));
391 memcpy(&list->pkt, pkt, htons(pkt->hdr.size));
393 else if (pkt->subtype == GNUNET_DNS_ANSWER_TYPE_REMOTE)
395 pkt->subtype = GNUNET_DNS_ANSWER_TYPE_IP;
398 memset(&key, 0, sizeof(GNUNET_HashCode));
400 unsigned char* c = ((unsigned char*)pkt)+ntohs(pkt->addroffset);
401 new_ip6addr_remote(c, pkt->addr, pkt->addrsize);
402 unsigned char* k = (unsigned char*)&key;
404 * Copy the newly generated ip-address to the key backwards (as only the first part is used in the hash-table)
407 for (i = 0; i < 16; i++)
410 uint16_t namelen = strlen((char*)pkt->data+12)+1;
412 struct map_entry* value = GNUNET_malloc(sizeof(struct map_entry) + namelen);
413 char* name = (char*)(value +1);
415 value->namelen = namelen;
416 memcpy(name, pkt->data+12, namelen);
418 value->addrlen = pkt->addrsize;
419 memcpy(&value->addr, &pkt->addr, pkt->addrsize);
420 memset(value->additional_ports, 0, 8192);
422 memcpy(&value->hash, &key, sizeof(GNUNET_HashCode));
425 GNUNET_CONTAINER_multihashmap_contains (hashmap, &key))
427 GNUNET_CONTAINER_multihashmap_put (hashmap, &key, value,
428 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
429 value->heap_node = GNUNET_CONTAINER_heap_insert (heap, value,
430 GNUNET_TIME_absolute_get ().abs_value);
431 if (GNUNET_CONTAINER_heap_get_size(heap) > max_mappings)
432 GNUNET_SCHEDULER_add_now(collect_mappings, NULL);
437 list = GNUNET_malloc(htons(pkt->hdr.size) + 2*sizeof(struct answer_packet_list*));
439 memcpy(&list->pkt, pkt, htons(pkt->hdr.size));
450 GNUNET_CONTAINER_DLL_insert_after(answer_proc_head, answer_proc_tail, answer_proc_tail, list);
452 schedule_helper_write(GNUNET_TIME_UNIT_FOREVER_REL, NULL);
458 * Sets a bit active in a bitArray.
460 * @param bitArray memory area to set the bit in
461 * @param bitIdx which bit to set
464 setBit (char *bitArray, unsigned int bitIdx)
467 unsigned int targetBit;
469 arraySlot = bitIdx / 8;
470 targetBit = (1L << (bitIdx % 8));
471 bitArray[arraySlot] |= targetBit;
475 * Clears a bit from bitArray.
477 * @param bitArray memory area to set the bit in
478 * @param bitIdx which bit to unset
481 clearBit (char *bitArray, unsigned int bitIdx)
484 unsigned int targetBit;
487 targetBit = (1L << (bitIdx % 8));
488 bitArray[slot] = bitArray[slot] & (~targetBit);
492 * Checks if a bit is active in the bitArray
494 * @param bitArray memory area to set the bit in
495 * @param bitIdx which bit to test
496 * @return GNUNET_YES if the bit is set, GNUNET_NO if not.
499 testBit (char *bitArray, unsigned int bitIdx)
502 unsigned int targetBit;
505 targetBit = (1L << (bitIdx % 8));
506 if (bitArray[slot] & targetBit)
513 * @brief Add the port to the list of additional ports in the map_entry
515 * @param me the map_entry
516 * @param port the port in host-byte-order
519 add_additional_port (struct map_entry *me, uint16_t port)
521 setBit(me->additional_ports, port);
525 receive_udp_back (void *cls, struct GNUNET_MESH_Tunnel* tunnel,
527 const struct GNUNET_PeerIdentity *sender,
528 const struct GNUNET_MessageHeader *message,
529 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
531 GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
532 struct remote_addr* s = (struct remote_addr*)desc;
533 struct udp_pkt *pkt = (struct udp_pkt *) (desc + 1);
534 const struct GNUNET_PeerIdentity* other = GNUNET_MESH_get_peer(tunnel);
536 size_t size = sizeof(struct ip6_udp) + ntohs(pkt->len) - 1 - sizeof(struct udp_pkt);
538 struct ip6_udp* pkt6 = alloca(size);
540 GNUNET_assert(pkt6 != NULL);
542 if (ntohs(message->type) == GNUNET_MESSAGE_TYPE_SERVICE_UDP_BACK)
543 new_ip6addr(pkt6->ip6_hdr.sadr, &other->hashPubKey, desc);
545 new_ip6addr_remote(pkt6->ip6_hdr.sadr, s->addr, s->addrlen);
547 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Relaying calc:%d gnu:%d udp:%d bytes!\n", size, ntohs(message->size), ntohs(pkt->len));
549 pkt6->shdr.type = htons(GNUNET_MESSAGE_TYPE_VPN_HELPER);
550 pkt6->shdr.size = htons(size);
553 pkt6->tun.type = htons(0x86dd);
555 pkt6->ip6_hdr.version = 6;
556 pkt6->ip6_hdr.tclass_h = 0;
557 pkt6->ip6_hdr.tclass_l = 0;
558 pkt6->ip6_hdr.flowlbl = 0;
559 pkt6->ip6_hdr.paylgth = pkt->len;
560 pkt6->ip6_hdr.nxthdr = 0x11;
561 pkt6->ip6_hdr.hoplmt = 0xff;
565 GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_string(cfg, "vpn", "IPV6ADDR", &ipv6addr));
566 inet_pton (AF_INET6, ipv6addr, pkt6->ip6_hdr.dadr);
567 GNUNET_free(ipv6addr);
569 memcpy(&pkt6->udp_hdr, pkt, ntohs(pkt->len));
571 GNUNET_HashCode* key = address_mapping_exists(pkt6->ip6_hdr.sadr);
572 GNUNET_assert (key != NULL);
574 struct map_entry *me = GNUNET_CONTAINER_multihashmap_get(hashmap, key);
575 GNUNET_CONTAINER_heap_update_cost (heap, me->heap_node,
576 GNUNET_TIME_absolute_get ().abs_value);
580 GNUNET_assert (me != NULL);
581 if (ntohs(message->type) == GNUNET_MESSAGE_TYPE_SERVICE_UDP_BACK)
583 GNUNET_assert (me->desc.service_type & htonl(GNUNET_DNS_SERVICE_TYPE_UDP));
584 if (!port_in_ports(me->desc.ports, pkt6->udp_hdr.spt) &&
585 !testBit(me->additional_ports, ntohs(pkt6->udp_hdr.spt))) {
586 add_additional_port(me, ntohs(pkt6->udp_hdr.spt));
590 pkt6->udp_hdr.crc = 0;
592 sum = calculate_checksum_update(sum, (uint16_t*)&pkt6->ip6_hdr.sadr, 16);
593 sum = calculate_checksum_update(sum, (uint16_t*)&pkt6->ip6_hdr.dadr, 16);
594 uint32_t tmp = (pkt6->udp_hdr.len & 0xffff);
595 sum = calculate_checksum_update(sum, (uint16_t*)&tmp, 4);
596 tmp = htons(((pkt6->ip6_hdr.nxthdr & 0x00ff)));
597 sum = calculate_checksum_update(sum, (uint16_t*)&tmp, 4);
599 sum = calculate_checksum_update(sum, (uint16_t*)&pkt6->udp_hdr, ntohs(pkt->len));
600 pkt6->udp_hdr.crc = calculate_checksum_end(sum);
602 write_to_helper(pkt6, size);
608 receive_tcp_back (void *cls, struct GNUNET_MESH_Tunnel* tunnel,
610 const struct GNUNET_PeerIdentity *sender,
611 const struct GNUNET_MessageHeader *message,
612 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
614 GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
615 struct remote_addr* s = (struct remote_addr*)desc;
616 struct tcp_pkt *pkt = (struct tcp_pkt *) (desc + 1);
617 const struct GNUNET_PeerIdentity* other = GNUNET_MESH_get_peer(tunnel);
619 size_t pktlen = ntohs(message->size) - sizeof(struct GNUNET_MessageHeader) - sizeof(GNUNET_HashCode);
620 size_t size = pktlen + sizeof(struct ip6_tcp) - 1;
622 struct ip6_tcp* pkt6 = alloca(size);
623 memset(pkt6, 0, size);
625 GNUNET_assert(pkt6 != NULL);
627 if (ntohs(message->type) == GNUNET_MESSAGE_TYPE_SERVICE_TCP_BACK)
628 new_ip6addr(pkt6->ip6_hdr.sadr, &other->hashPubKey, desc);
630 new_ip6addr_remote(pkt6->ip6_hdr.sadr, s->addr, s->addrlen);
632 pkt6->shdr.type = htons(GNUNET_MESSAGE_TYPE_VPN_HELPER);
633 pkt6->shdr.size = htons(size);
636 pkt6->tun.type = htons(0x86dd);
638 pkt6->ip6_hdr.version = 6;
639 pkt6->ip6_hdr.tclass_h = 0;
640 pkt6->ip6_hdr.tclass_l = 0;
641 pkt6->ip6_hdr.flowlbl = 0;
642 pkt6->ip6_hdr.paylgth = htons(pktlen);
643 pkt6->ip6_hdr.nxthdr = 0x06;
644 pkt6->ip6_hdr.hoplmt = 0xff;
648 GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_string(cfg, "vpn", "IPV6ADDR", &ipv6addr));
649 inet_pton (AF_INET6, ipv6addr, pkt6->ip6_hdr.dadr);
650 GNUNET_free(ipv6addr);
652 memcpy(&pkt6->tcp_hdr, pkt, pktlen);
654 GNUNET_HashCode* key = address_mapping_exists(pkt6->ip6_hdr.sadr);
655 GNUNET_assert (key != NULL);
657 struct map_entry *me = GNUNET_CONTAINER_multihashmap_get(hashmap, key);
658 GNUNET_CONTAINER_heap_update_cost (heap, me->heap_node,
659 GNUNET_TIME_absolute_get ().abs_value);
663 GNUNET_assert (me != NULL);
664 if (ntohs(message->type) == GNUNET_MESSAGE_TYPE_SERVICE_UDP_BACK)
665 GNUNET_assert (me->desc.service_type & htonl(GNUNET_DNS_SERVICE_TYPE_TCP));
667 pkt6->tcp_hdr.crc = 0;
671 calculate_checksum_update (sum, (uint16_t *) & pkt6->ip6_hdr.sadr, 16);
673 calculate_checksum_update (sum, (uint16_t *) & pkt6->ip6_hdr.dadr, 16);
675 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
676 tmp = htonl (((pkt6->ip6_hdr.nxthdr & 0x000000ff)));
677 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
680 calculate_checksum_update (sum, (uint16_t *) & pkt6->tcp_hdr,
681 ntohs (pkt6->ip6_hdr.paylgth));
682 pkt6->tcp_hdr.crc = calculate_checksum_end (sum);
684 write_to_helper(pkt6, size);
690 * Main function that will be run by the scheduler.
693 * @param args remaining command-line arguments
694 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
695 * @param cfg_ configuration
701 const struct GNUNET_CONFIGURATION_Handle *cfg_)
703 const static struct GNUNET_MESH_MessageHandler handlers[] = {
704 {receive_udp_back, GNUNET_MESSAGE_TYPE_SERVICE_UDP_BACK, 0},
705 {receive_tcp_back, GNUNET_MESSAGE_TYPE_SERVICE_TCP_BACK, 0},
706 {receive_udp_back, GNUNET_MESSAGE_TYPE_REMOTE_UDP_BACK, 0},
707 {receive_tcp_back, GNUNET_MESSAGE_TYPE_REMOTE_TCP_BACK, 0},
710 mesh_handle = GNUNET_MESH_connect(cfg_,
717 hashmap = GNUNET_CONTAINER_multihashmap_create(65536);
718 heap = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
719 GNUNET_CONFIGURATION_get_value_number (cfg, "vpn", "MAX_MAPPINGg",
721 udp_connections = GNUNET_CONTAINER_multihashmap_create(65536);
722 GNUNET_SCHEDULER_TaskIdentifier conn_task = GNUNET_SCHEDULER_add_now (connect_to_service_dns, NULL);
723 GNUNET_SCHEDULER_add_after (conn_task, start_helper_and_schedule, NULL);
724 GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_UNIT_FOREVER_REL, &cleanup, cls);
728 * The main function to obtain template from gnunetd.
730 * @param argc number of arguments from the command line
731 * @param argv command line arguments
732 * @return 0 ok, 1 on error
735 main (int argc, char *const *argv) {
736 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
737 GNUNET_GETOPT_OPTION_END
741 GNUNET_PROGRAM_run (argc,
744 gettext_noop ("help text"),
745 options, &run, NULL)) ? ret : 1;
748 /* end of gnunet-daemon-vpn.c */