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Diffstat (limited to 'src/vpn/gnunet-daemon-vpn-helper.c')
-rw-r--r--src/vpn/gnunet-daemon-vpn-helper.c691
1 files changed, 0 insertions, 691 deletions
diff --git a/src/vpn/gnunet-daemon-vpn-helper.c b/src/vpn/gnunet-daemon-vpn-helper.c
deleted file mode 100644
index 3bb3aa262..000000000
--- a/src/vpn/gnunet-daemon-vpn-helper.c
+++ /dev/null
@@ -1,691 +0,0 @@
1/*
2 This file is part of GNUnet.
3 (C) 2010 Christian Grothoff
4
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.
9
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.
14
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.
19*/
20
21/**
22 * @file vpn/gnunet-daemon-vpn-helper.c
23 * @brief
24 * @author Philipp Toelke
25 */
26#include <platform.h>
27#include <gnunet_common.h>
28#include <gnunet_client_lib.h>
29#include <gnunet_os_lib.h>
30#include <gnunet_mesh_service.h>
31#include <gnunet_protocols.h>
32#include <gnunet_server_lib.h>
33#include <gnunet_container_lib.h>
34#include <block_dns.h>
35#include <gnunet_configuration_lib.h>
36#include <gnunet_applications.h>
37#include <gnunet_dns_service.h>
38
39#include "gnunet-daemon-vpn.h"
40#include "gnunet-daemon-vpn-helper.h"
41#include "gnunet-vpn-packet.h"
42#include "gnunet-vpn-checksum.h"
43#include "gnunet-helper-vpn-api.h"
44
45struct GNUNET_VPN_HELPER_Handle *helper_handle;
46
47extern struct GNUNET_CLIENT_TransmitHandle *dns_transmit_handle;
48
49/**
50 * The tunnels that will be used to send tcp- and udp-packets
51 */
52static struct GNUNET_MESH_Tunnel *tcp_tunnel;
53static struct GNUNET_MESH_Tunnel *udp_tunnel;
54
55/**
56 * Start the helper-process
57 *
58 * If cls != NULL it is assumed that this function is called as a result of a dying
59 * helper. cls is then taken as handle to the old helper and is cleaned up.
60 * {{{
61 */
62void
63start_helper_and_schedule (void *cls,
64 const struct GNUNET_SCHEDULER_TaskContext *tc)
65{
66 shs_task = GNUNET_SCHEDULER_NO_TASK;
67 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
68 return;
69
70 if (cls != NULL)
71 cleanup_helper (cls);
72 cls = NULL;
73
74 char *ifname;
75 char *ipv6addr;
76 char *ipv6prefix;
77 char *ipv4addr;
78 char *ipv4mask;
79
80 if (GNUNET_SYSERR ==
81 GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "IFNAME", &ifname))
82 {
83 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
84 "No entry 'IFNAME' in configuration!\n");
85 exit (1);
86 }
87
88 if (GNUNET_SYSERR ==
89 GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "IPV6ADDR", &ipv6addr))
90 {
91 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
92 "No entry 'IPV6ADDR' in configuration!\n");
93 exit (1);
94 }
95
96 if (GNUNET_SYSERR ==
97 GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "IPV6PREFIX",
98 &ipv6prefix))
99 {
100 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
101 "No entry 'IPV6PREFIX' in configuration!\n");
102 exit (1);
103 }
104
105 if (GNUNET_SYSERR ==
106 GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "IPV4ADDR", &ipv4addr))
107 {
108 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
109 "No entry 'IPV4ADDR' in configuration!\n");
110 exit (1);
111 }
112
113 if (GNUNET_SYSERR ==
114 GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "IPV4MASK", &ipv4mask))
115 {
116 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
117 "No entry 'IPV4MASK' in configuration!\n");
118 exit (1);
119 }
120
121 /* Start the helper
122 * Messages get passed to the function message_token
123 * When the helper dies, this function will be called again with the
124 * helper_handle as cls.
125 */
126 helper_handle =
127 start_helper (ifname, ipv6addr, ipv6prefix, ipv4addr, ipv4mask,
128 "vpn-gnunet", start_helper_and_schedule, message_token,
129 NULL);
130
131 GNUNET_free (ipv6addr);
132 GNUNET_free (ipv6prefix);
133 GNUNET_free (ipv4addr);
134 GNUNET_free (ipv4mask);
135 GNUNET_free (ifname);
136
137 /* Tell the dns-service to rehijack the dns-port
138 * The routing-table gets flushed if an interface disappears.
139 */
140 GNUNET_DNS_restart_hijack (dns_handle);
141 GNUNET_SCHEDULER_add_write_file (GNUNET_TIME_UNIT_FOREVER_REL,
142 helper_handle->fh_to_helper, &helper_write,
143 NULL);
144}
145
146/*}}}*/
147
148static void *
149initialize_tunnel_state (int addrlen, struct GNUNET_MESH_TransmitHandle *th)
150{
151 struct tunnel_state *ts = GNUNET_malloc (sizeof *ts);
152
153 ts->addrlen = addrlen;
154 ts->th = th;
155 return ts;
156}
157
158/**
159 * Send an dns-answer-packet to the helper
160 */
161void
162helper_write (void *cls GNUNET_UNUSED,
163 const struct GNUNET_SCHEDULER_TaskContext *tsdkctx)
164{
165 if (tsdkctx->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
166 return;
167
168 struct answer_packet_list *ans = answer_proc_head;
169
170 if (NULL == ans)
171 return;
172
173 size_t len = ntohs (ans->pkt.hdr.size);
174
175 GNUNET_assert (ans->pkt.subtype == GNUNET_DNS_ANSWER_TYPE_IP);
176
177 GNUNET_assert (20 == sizeof (struct ip_hdr));
178 GNUNET_assert (8 == sizeof (struct udp_pkt));
179
180 size_t data_len = len - sizeof (struct answer_packet) + 1;
181
182 void *buf;
183 size_t pkt_len;
184
185 if (ans->pkt.addrlen == 16)
186 {
187 size_t net_len =
188 sizeof (struct ip6_hdr) + sizeof (struct udp_dns) + data_len;
189 pkt_len =
190 sizeof (struct GNUNET_MessageHeader) + sizeof (struct pkt_tun) +
191 net_len;
192
193 struct ip6_udp_dns *pkt = alloca (pkt_len);
194
195 GNUNET_assert (pkt != NULL);
196 memset (pkt, 0, pkt_len);
197
198 /* set the gnunet-header */
199 pkt->shdr.size = htons (pkt_len);
200 pkt->shdr.type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
201
202 /* set the tun-header (no flags and ethertype of IPv4) */
203 pkt->tun.flags = 0;
204 pkt->tun.type = htons (0x86dd);
205
206 memcpy (&pkt->ip6_hdr.sadr, ans->pkt.from, 16);
207 memcpy (&pkt->ip6_hdr.dadr, ans->pkt.to, 16);
208
209 /* set the udp-header */
210 pkt->udp_dns.udp_hdr.spt = htons (53);
211 pkt->udp_dns.udp_hdr.dpt = ans->pkt.dst_port;
212 pkt->udp_dns.udp_hdr.len = htons (net_len - sizeof (struct ip6_hdr));
213 pkt->udp_dns.udp_hdr.crc = 0;
214 uint32_t sum = 0;
215
216 sum = calculate_checksum_update (sum, (uint16_t *) & pkt->ip6_hdr.sadr, 16);
217 sum = calculate_checksum_update (sum, (uint16_t *) & pkt->ip6_hdr.dadr, 16);
218 uint32_t tmp = (pkt->udp_dns.udp_hdr.len & 0xffff);
219
220 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
221 tmp = htons (((pkt->ip6_hdr.nxthdr & 0x00ff)));
222 sum = calculate_checksum_update (sum, (uint16_t *) & tmp, 4);
223
224 sum =
225 calculate_checksum_update (sum, (uint16_t *) & pkt->udp_dns.udp_hdr,
226 ntohs (net_len - sizeof (struct ip6_hdr)));
227 pkt->udp_dns.udp_hdr.crc = calculate_checksum_end (sum);
228
229 pkt->ip6_hdr.version = 6;
230 pkt->ip6_hdr.paylgth = net_len - sizeof (struct ip6_hdr);
231 pkt->ip6_hdr.nxthdr = IPPROTO_UDP;
232 pkt->ip6_hdr.hoplmt = 0xff;
233
234 memcpy (&pkt->udp_dns.data, ans->pkt.data, data_len);
235 buf = pkt;
236 }
237 else if (ans->pkt.addrlen == 4)
238 {
239 size_t net_len =
240 sizeof (struct ip_hdr) + sizeof (struct udp_dns) + data_len;
241 pkt_len =
242 sizeof (struct GNUNET_MessageHeader) + sizeof (struct pkt_tun) +
243 net_len;
244
245 struct ip_udp_dns *pkt = alloca (pkt_len);
246
247 GNUNET_assert (pkt != NULL);
248 memset (pkt, 0, pkt_len);
249
250 /* set the gnunet-header */
251 pkt->shdr.size = htons (pkt_len);
252 pkt->shdr.type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
253
254 /* set the tun-header (no flags and ethertype of IPv4) */
255 pkt->tun.flags = 0;
256 pkt->tun.type = htons (0x0800);
257
258 /* set the ip-header */
259 pkt->ip_hdr.version = 4;
260 pkt->ip_hdr.hdr_lngth = 5;
261 pkt->ip_hdr.diff_serv = 0;
262 pkt->ip_hdr.tot_lngth = htons (net_len);
263 pkt->ip_hdr.ident = 0;
264 pkt->ip_hdr.flags = 0;
265 pkt->ip_hdr.frag_off = 0;
266 pkt->ip_hdr.ttl = 255;
267 pkt->ip_hdr.proto = IPPROTO_UDP;
268 pkt->ip_hdr.chks = 0; /* Will be calculated later */
269
270 memcpy (&pkt->ip_hdr.sadr, ans->pkt.from, 4);
271 memcpy (&pkt->ip_hdr.dadr, ans->pkt.to, 4);
272
273 pkt->ip_hdr.chks =
274 calculate_ip_checksum ((uint16_t *) & pkt->ip_hdr, 5 * 4);
275
276 /* set the udp-header */
277 pkt->udp_dns.udp_hdr.spt = htons (53);
278 pkt->udp_dns.udp_hdr.dpt = ans->pkt.dst_port;
279 pkt->udp_dns.udp_hdr.len = htons (net_len - sizeof (struct ip_hdr));
280 pkt->udp_dns.udp_hdr.crc = 0; /* Optional for IPv4 */
281
282 memcpy (&pkt->udp_dns.data, ans->pkt.data, data_len);
283 buf = pkt;
284 }
285 else
286 {
287 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Wrong addrlen = %d\n",
288 ans->pkt.addrlen);
289 GNUNET_assert (0);
290 return; /* convince compiler that we're done here */
291 }
292
293 GNUNET_CONTAINER_DLL_remove (answer_proc_head, answer_proc_tail, ans);
294 GNUNET_free (ans);
295
296 if (GNUNET_DISK_file_write (helper_handle->fh_to_helper, buf, pkt_len) < 0)
297 {
298 cleanup_helper (helper_handle);
299 GNUNET_SCHEDULER_add_now (start_helper_and_schedule, NULL);
300 return;
301 }
302
303 /* if more packets are available, reschedule */
304 if (answer_proc_head != NULL)
305 GNUNET_SCHEDULER_add_write_file (GNUNET_TIME_UNIT_FOREVER_REL,
306 helper_handle->fh_to_helper, &helper_write,
307 NULL);
308}
309
310/**
311 * Receive packets from the helper-process
312 */
313void
314message_token (void *cls GNUNET_UNUSED, void *client GNUNET_UNUSED,
315 const struct GNUNET_MessageHeader *message)
316{
317 GNUNET_assert (ntohs (message->type) == GNUNET_MESSAGE_TYPE_VPN_HELPER);
318
319 struct tun_pkt *pkt_tun = (struct tun_pkt *) message;
320 GNUNET_HashCode *key;
321
322 /* ethertype is ipv6 */
323 if (ntohs (pkt_tun->tun.type) == 0x86dd)
324 {
325 struct ip6_pkt *pkt6 = (struct ip6_pkt *) message;
326
327 GNUNET_assert (pkt6->ip6_hdr.version == 6);
328 struct ip6_tcp *pkt6_tcp;
329 struct ip6_udp *pkt6_udp;
330 struct ip6_icmp *pkt6_icmp;
331
332 pkt6_udp = NULL; /* make compiler happy */
333 switch (pkt6->ip6_hdr.nxthdr)
334 {
335 case IPPROTO_UDP:
336 pkt6_udp = (struct ip6_udp *) pkt6;
337 /* Send dns-packets to the service-dns */
338 if (ntohs (pkt6_udp->udp_hdr.dpt) == 53)
339 {
340 /* 9 = 8 for the udp-header + 1 for the unsigned char data[1]; */
341 GNUNET_DNS_queue_request_v6 (dns_handle,
342 &pkt6->ip6_hdr.dadr,
343 &pkt6->ip6_hdr.sadr,
344 ntohs (pkt6_udp->udp_hdr.spt),
345 ntohs (pkt6_udp->udp_hdr.len) - 8,
346 (const void*) pkt6_udp->data);
347
348 break;
349 }
350 /* fall through */
351 case IPPROTO_TCP:
352 pkt6_tcp = (struct ip6_tcp *) pkt6;
353
354 if ((key = address6_mapping_exists (&pkt6->ip6_hdr.dadr)) != NULL)
355 {
356 struct map_entry *me = GNUNET_CONTAINER_multihashmap_get (hashmap, key);
357
358 GNUNET_assert (me != NULL);
359 GNUNET_free (key);
360
361 size_t size =
362 sizeof (struct GNUNET_MESH_Tunnel *) +
363 sizeof (struct GNUNET_MessageHeader) + sizeof (GNUNET_HashCode) +
364 ntohs (pkt6->ip6_hdr.paylgth);
365
366 struct GNUNET_MESH_Tunnel **cls = GNUNET_malloc (size);
367 struct GNUNET_MessageHeader *hdr =
368 (struct GNUNET_MessageHeader *) (cls + 1);
369 GNUNET_HashCode *hc = (GNUNET_HashCode *) (hdr + 1);
370
371 hdr->size =
372 htons (sizeof (struct GNUNET_MessageHeader) +
373 sizeof (GNUNET_HashCode) + ntohs (pkt6->ip6_hdr.paylgth));
374
375 GNUNET_MESH_ApplicationType app_type = 0; /* fix compiler uninitialized warning... */
376
377 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "me->addrlen is %d\n",
378 me->addrlen);
379 if (me->addrlen == 0)
380 {
381 /* This is a mapping to a gnunet-service */
382 memcpy (hc, &me->desc.service_descriptor, sizeof (GNUNET_HashCode));
383
384 if (IPPROTO_UDP == pkt6->ip6_hdr.nxthdr &&
385 (me->desc.service_type & htonl (GNUNET_DNS_SERVICE_TYPE_UDP)) &&
386 (port_in_ports (me->desc.ports, pkt6_udp->udp_hdr.dpt) ||
387 testBit (me->additional_ports, ntohs (pkt6_udp->udp_hdr.dpt))))
388 {
389 hdr->type = htons (GNUNET_MESSAGE_TYPE_VPN_SERVICE_UDP);
390
391 memcpy (hc + 1, &pkt6_udp->udp_hdr, ntohs (pkt6_udp->udp_hdr.len));
392
393 }
394 else if (IPPROTO_TCP == pkt6->ip6_hdr.nxthdr &&
395 (me->desc.service_type & htonl (GNUNET_DNS_SERVICE_TYPE_TCP))
396 && (port_in_ports (me->desc.ports, pkt6_tcp->tcp_hdr.dpt)))
397 {
398 hdr->type = htons (GNUNET_MESSAGE_TYPE_VPN_SERVICE_TCP);
399
400 memcpy (hc + 1, &pkt6_tcp->tcp_hdr, ntohs (pkt6->ip6_hdr.paylgth));
401
402 }
403 else
404 {
405 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "pip: %d\n",
406 port_in_ports (me->desc.ports, pkt6_tcp->tcp_hdr.dpt));
407 GNUNET_assert (0);
408 }
409 if (me->tunnel == NULL && NULL != cls)
410 {
411 *cls =
412 GNUNET_MESH_tunnel_create (mesh_handle,
413 initialize_tunnel_state (16, NULL),
414 &send_pkt_to_peer, NULL, cls);
415
416 GNUNET_MESH_peer_request_connect_add (*cls,
417 (struct GNUNET_PeerIdentity *)
418 &me->desc.peer);
419 me->tunnel = *cls;
420 }
421 else if (NULL != cls)
422 {
423 *cls = me->tunnel;
424 send_pkt_to_peer (cls, (struct GNUNET_PeerIdentity *) 1, NULL);
425 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
426 "Queued to send IPv6 to peer %x, type %d\n",
427 *((unsigned int *) &me->desc.peer), ntohs (hdr->type));
428 }
429 }
430 else
431 {
432 /* This is a mapping to a "real" address */
433 struct remote_addr *s = (struct remote_addr *) hc;
434
435 s->addrlen = me->addrlen;
436 memcpy (s->addr, me->addr, me->addrlen);
437 s->proto = pkt6->ip6_hdr.nxthdr;
438 if (s->proto == IPPROTO_UDP)
439 {
440 hdr->type = htons (GNUNET_MESSAGE_TYPE_VPN_REMOTE_UDP);
441 memcpy (hc + 1, &pkt6_udp->udp_hdr, ntohs (pkt6_udp->udp_hdr.len));
442 app_type = GNUNET_APPLICATION_TYPE_INTERNET_UDP_GATEWAY;
443 if (NULL != udp_tunnel)
444 me->tunnel = udp_tunnel;
445 }
446 else if (s->proto == IPPROTO_TCP)
447 {
448 hdr->type = htons (GNUNET_MESSAGE_TYPE_VPN_REMOTE_TCP);
449 memcpy (hc + 1, &pkt6_tcp->tcp_hdr, ntohs (pkt6->ip6_hdr.paylgth));
450 app_type = GNUNET_APPLICATION_TYPE_INTERNET_TCP_GATEWAY;
451 if (NULL != tcp_tunnel)
452 me->tunnel = tcp_tunnel;
453 }
454 else
455 {
456 GNUNET_assert (0);
457 }
458 if (me->tunnel == NULL && NULL != cls)
459 {
460 *cls =
461 GNUNET_MESH_tunnel_create (mesh_handle,
462 initialize_tunnel_state (16, NULL),
463 &send_pkt_to_peer, NULL, cls);
464
465 GNUNET_MESH_peer_request_connect_by_type (*cls, app_type);
466 me->tunnel = *cls;
467 if (GNUNET_APPLICATION_TYPE_INTERNET_UDP_GATEWAY == app_type)
468 udp_tunnel = *cls;
469 else if (GNUNET_APPLICATION_TYPE_INTERNET_TCP_GATEWAY == app_type)
470 tcp_tunnel = *cls;
471 }
472 else if (NULL != cls)
473 {
474 *cls = me->tunnel;
475 send_pkt_to_peer (cls, (struct GNUNET_PeerIdentity *) 1, NULL);
476 }
477 }
478 }
479 else
480 {
481 char pbuf[INET6_ADDRSTRLEN];
482 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
483 "Packet to %s, which has no mapping\n",
484 inet_ntop (AF_INET6,
485 &pkt6->ip6_hdr.dadr,
486 pbuf,
487 sizeof (pbuf)));
488 }
489 break;
490 case 0x3a:
491 /* ICMPv6 */
492 pkt6_icmp = (struct ip6_icmp *) pkt6;
493 /* If this packet is an icmp-echo-request and a mapping exists, answer */
494 if (pkt6_icmp->icmp_hdr.type == 0x80 &&
495 (key = address6_mapping_exists (&pkt6->ip6_hdr.dadr)) != NULL)
496 {
497 GNUNET_free (key);
498 pkt6_icmp = GNUNET_malloc (ntohs (pkt6->shdr.size));
499 memcpy (pkt6_icmp, pkt6, ntohs (pkt6->shdr.size));
500 GNUNET_SCHEDULER_add_now (&send_icmp6_response, pkt6_icmp);
501 }
502 break;
503 }
504 }
505 /* ethertype is ipv4 */
506 else if (ntohs (pkt_tun->tun.type) == 0x0800)
507 {
508 struct ip_pkt *pkt = (struct ip_pkt *) message;
509 struct ip_udp *udp = (struct ip_udp *) message;
510 struct ip_tcp *pkt_tcp;
511 struct ip_udp *pkt_udp;
512 struct ip_icmp *pkt_icmp;
513
514 GNUNET_assert (pkt->ip_hdr.version == 4);
515
516 /* Send dns-packets to the service-dns */
517 if (pkt->ip_hdr.proto == IPPROTO_UDP && ntohs (udp->udp_hdr.dpt) == 53)
518 {
519 GNUNET_DNS_queue_request_v4 (dns_handle,
520 &pkt->ip_hdr.dadr,
521 &pkt->ip_hdr.sadr,
522 ntohs (udp->udp_hdr.spt),
523 ntohs (udp->udp_hdr.len) - 8,
524 (const void*) udp->data);
525 }
526 else
527 {
528 uint32_t dadr = pkt->ip_hdr.dadr.s_addr;
529 unsigned char *c = (unsigned char *) &dadr;
530
531 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Packet to %d.%d.%d.%d, proto %x\n",
532 c[0], c[1], c[2], c[3], pkt->ip_hdr.proto);
533 switch (pkt->ip_hdr.proto)
534 {
535 case IPPROTO_TCP:
536 case IPPROTO_UDP:
537 pkt_tcp = (struct ip_tcp *) pkt;
538 pkt_udp = (struct ip_udp *) pkt;
539
540 if ((key = address4_mapping_exists (dadr)) != NULL)
541 {
542 struct map_entry *me =
543 GNUNET_CONTAINER_multihashmap_get (hashmap, key);
544 GNUNET_assert (me != NULL);
545 GNUNET_free (key);
546
547 size_t size =
548 sizeof (struct GNUNET_MESH_Tunnel *) +
549 sizeof (struct GNUNET_MessageHeader) + sizeof (GNUNET_HashCode) +
550 ntohs (pkt->ip_hdr.tot_lngth) - 4 * pkt->ip_hdr.hdr_lngth;
551
552 struct GNUNET_MESH_Tunnel **cls = GNUNET_malloc (size);
553 struct GNUNET_MessageHeader *hdr =
554 (struct GNUNET_MessageHeader *) (cls + 1);
555 GNUNET_HashCode *hc = (GNUNET_HashCode *) (hdr + 1);
556
557 hdr->size =
558 htons (sizeof (struct GNUNET_MessageHeader) +
559 sizeof (GNUNET_HashCode) + ntohs (pkt->ip_hdr.tot_lngth) -
560 4 * pkt->ip_hdr.hdr_lngth);
561
562 GNUNET_MESH_ApplicationType app_type = 0; /* make compiler happy */
563
564 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "me->addrlen is %d\n",
565 me->addrlen);
566 if (me->addrlen == 0)
567 {
568 /* This is a mapping to a gnunet-service */
569 memcpy (hc, &me->desc.service_descriptor, sizeof (GNUNET_HashCode));
570
571 if ((IPPROTO_UDP == pkt->ip_hdr.proto) &&
572 (me->desc.service_type & htonl (GNUNET_DNS_SERVICE_TYPE_UDP)) &&
573 (port_in_ports (me->desc.ports, pkt_udp->udp_hdr.dpt) ||
574 testBit (me->additional_ports, ntohs (pkt_udp->udp_hdr.dpt))))
575 {
576 hdr->type = htons (GNUNET_MESSAGE_TYPE_VPN_SERVICE_UDP);
577
578 memcpy (hc + 1, &pkt_udp->udp_hdr, ntohs (pkt_udp->udp_hdr.len));
579
580 }
581 else if ((IPPROTO_TCP == pkt->ip_hdr.proto) &&
582 (me->
583 desc.service_type & htonl (GNUNET_DNS_SERVICE_TYPE_TCP))
584 && (port_in_ports (me->desc.ports, pkt_tcp->tcp_hdr.dpt)))
585 {
586 hdr->type = htons (GNUNET_MESSAGE_TYPE_VPN_SERVICE_TCP);
587
588 memcpy (hc + 1, &pkt_tcp->tcp_hdr,
589 ntohs (pkt->ip_hdr.tot_lngth) -
590 4 * pkt->ip_hdr.hdr_lngth);
591
592 }
593 if (me->tunnel == NULL && NULL != cls)
594 {
595 *cls =
596 GNUNET_MESH_tunnel_create (mesh_handle,
597 initialize_tunnel_state (4, NULL),
598 send_pkt_to_peer, NULL, cls);
599 GNUNET_MESH_peer_request_connect_add (*cls,
600 (struct GNUNET_PeerIdentity
601 *) &me->desc.peer);
602 me->tunnel = *cls;
603 }
604 else if (NULL != cls)
605 {
606 *cls = me->tunnel;
607 send_pkt_to_peer (cls, (struct GNUNET_PeerIdentity *) 1, NULL);
608 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
609 "Queued to send IPv4 to peer %x, type %d\n",
610 *((unsigned int *) &me->desc.peer),
611 ntohs (hdr->type));
612 }
613 }
614 else
615 {
616 /* This is a mapping to a "real" address */
617 struct remote_addr *s = (struct remote_addr *) hc;
618
619 s->addrlen = me->addrlen;
620 memcpy (s->addr, me->addr, me->addrlen);
621 s->proto = pkt->ip_hdr.proto;
622 if (s->proto == IPPROTO_UDP)
623 {
624 hdr->type = htons (GNUNET_MESSAGE_TYPE_VPN_REMOTE_UDP);
625 memcpy (hc + 1, &pkt_udp->udp_hdr, ntohs (pkt_udp->udp_hdr.len));
626 app_type = GNUNET_APPLICATION_TYPE_INTERNET_UDP_GATEWAY;
627 }
628 else if (s->proto == IPPROTO_TCP)
629 {
630 hdr->type = htons (GNUNET_MESSAGE_TYPE_VPN_REMOTE_TCP);
631 memcpy (hc + 1, &pkt_tcp->tcp_hdr,
632 ntohs (pkt->ip_hdr.tot_lngth) -
633 4 * pkt->ip_hdr.hdr_lngth);
634 app_type = GNUNET_APPLICATION_TYPE_INTERNET_TCP_GATEWAY;
635 }
636 else
637 GNUNET_assert (0);
638 if (me->tunnel == NULL && NULL != cls)
639 {
640 *cls =
641 GNUNET_MESH_tunnel_create (mesh_handle,
642 initialize_tunnel_state (4, NULL),
643 send_pkt_to_peer, NULL, cls);
644
645 GNUNET_MESH_peer_request_connect_by_type (*cls, app_type);
646 me->tunnel = *cls;
647 }
648 else if (NULL != cls)
649 {
650 *cls = me->tunnel;
651 send_pkt_to_peer (cls, (struct GNUNET_PeerIdentity *) 1, NULL);
652 }
653 }
654 }
655 else
656 {
657 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
658 "Packet to %x which has no mapping\n", dadr);
659 }
660 break;
661 case 0x01:
662 /* ICMP */
663 pkt_icmp = (struct ip_icmp *) pkt;
664 if (pkt_icmp->icmp_hdr.type == 0x8 &&
665 (key = address4_mapping_exists (dadr)) != NULL)
666 {
667 GNUNET_free (key);
668 pkt_icmp = GNUNET_malloc (ntohs (pkt->shdr.size));
669 memcpy (pkt_icmp, pkt, ntohs (pkt->shdr.size));
670 GNUNET_SCHEDULER_add_now (&send_icmp4_response, pkt_icmp);
671 }
672 break;
673 }
674 }
675 }
676}
677
678void
679write_to_helper (void *buf, size_t len)
680{
681 (void) GNUNET_DISK_file_write (helper_handle->fh_to_helper, buf, len);
682}
683
684void
685schedule_helper_write (struct GNUNET_TIME_Relative time, void *cls)
686{
687 if (GNUNET_SCHEDULER_NO_TASK != shs_task)
688 return;
689 GNUNET_SCHEDULER_add_write_file (time, helper_handle->fh_to_helper,
690 &helper_write, cls);
691}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-06 08:55:42 +0000