1 | /* |
1 | /* |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
3 | Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com> |
3 | Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> |
4 | |
4 | |
|
|
5 | This file is part of GVPE. |
|
|
6 | |
5 | This program is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify |
6 | it under the terms of the GNU General Public License as published by |
8 | it under the terms of the GNU General Public License as published by |
7 | the Free Software Foundation; either version 2 of the License, or |
9 | the Free Software Foundation; either version 2 of the License, or |
8 | (at your option) any later version. |
10 | (at your option) any later version. |
9 | |
11 | |
10 | This program is distributed in the hope that it will be useful, |
12 | This program is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | GNU General Public License for more details. |
15 | GNU General Public License for more details. |
14 | |
16 | |
15 | You should have received a copy of the GNU General Public License |
17 | You should have received a copy of the GNU General Public License |
16 | along with this program; if not, write to the Free Software |
18 | along with gvpe; if not, write to the Free Software |
17 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
18 | */ |
20 | */ |
19 | |
21 | |
20 | #include "config.h" |
22 | #include "config.h" |
21 | |
23 | |
… | |
… | |
226 | #endif |
228 | #endif |
227 | |
229 | |
228 | #if ENABLE_DNS |
230 | #if ENABLE_DNS |
229 | if (THISNODE->protocols & PROT_DNSv4) |
231 | if (THISNODE->protocols & PROT_DNSv4) |
230 | { |
232 | { |
|
|
233 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
|
|
234 | |
231 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
235 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
232 | |
236 | |
233 | if (dnsv4_fd < 0) |
237 | if (dnsv4_fd < 0) |
234 | return -1; |
238 | return -1; |
235 | |
239 | |
236 | // standard daemon practise... |
240 | // standard daemon practise... |
237 | { |
241 | { |
238 | int oval = 1; |
242 | int oval = 1; |
239 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
243 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
240 | } |
244 | } |
241 | |
245 | |
242 | sockinfo si (THISNODE, PROT_DNSv4); |
246 | sockinfo si (THISNODE->dns_hostname, |
|
|
247 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
|
|
248 | PROT_DNSv4); |
243 | |
249 | |
244 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
250 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
245 | { |
251 | { |
246 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
252 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
247 | exit (EXIT_FAILURE); |
253 | exit (EXIT_FAILURE); |
… | |
… | |
263 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
269 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
264 | |
270 | |
265 | reconnect_all (); |
271 | reconnect_all (); |
266 | |
272 | |
267 | return 0; |
273 | return 0; |
268 | } |
|
|
269 | |
|
|
270 | // send a vpn packet out to other hosts |
|
|
271 | bool |
|
|
272 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
273 | { |
|
|
274 | switch (si.prot) |
|
|
275 | { |
|
|
276 | case PROT_IPv4: |
|
|
277 | return send_ipv4_packet (pkt, si, tos); |
|
|
278 | |
|
|
279 | case PROT_UDPv4: |
|
|
280 | return send_udpv4_packet (pkt, si, tos); |
|
|
281 | |
|
|
282 | #if ENABLE_TCP |
|
|
283 | case PROT_TCPv4: |
|
|
284 | return send_tcpv4_packet (pkt, si, tos); |
|
|
285 | #endif |
|
|
286 | |
|
|
287 | #if ENABLE_ICMP |
|
|
288 | case PROT_ICMPv4: |
|
|
289 | return send_icmpv4_packet (pkt, si, tos); |
|
|
290 | #endif |
|
|
291 | |
|
|
292 | #if ENABLE_DNS |
|
|
293 | case PROT_DNSv4: |
|
|
294 | return send_dnsv4_packet (pkt, si, tos); |
|
|
295 | #endif |
|
|
296 | |
|
|
297 | default: |
|
|
298 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
299 | return false; |
|
|
300 | } |
|
|
301 | } |
274 | } |
302 | |
275 | |
303 | bool |
276 | bool |
304 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
277 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
305 | { |
278 | { |
… | |
… | |
424 | else |
397 | else |
425 | c->recv_vpn_packet (pkt, rsi); |
398 | c->recv_vpn_packet (pkt, rsi); |
426 | } |
399 | } |
427 | } |
400 | } |
428 | |
401 | |
|
|
402 | bool |
|
|
403 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
404 | { |
|
|
405 | switch (si.prot) |
|
|
406 | { |
|
|
407 | case PROT_IPv4: |
|
|
408 | return send_ipv4_packet (pkt, si, tos); |
|
|
409 | case PROT_UDPv4: |
|
|
410 | return send_udpv4_packet (pkt, si, tos); |
|
|
411 | #if ENABLE_TCP |
|
|
412 | case PROT_TCPv4: |
|
|
413 | return send_tcpv4_packet (pkt, si, tos); |
|
|
414 | #endif |
|
|
415 | #if ENABLE_ICMP |
|
|
416 | case PROT_ICMPv4: |
|
|
417 | return send_icmpv4_packet (pkt, si, tos); |
|
|
418 | #endif |
|
|
419 | #if ENABLE_DNS |
|
|
420 | case PROT_DNSv4: |
|
|
421 | return send_dnsv4_packet (pkt, si, tos); |
|
|
422 | #endif |
|
|
423 | |
|
|
424 | default: |
|
|
425 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
426 | } |
|
|
427 | |
|
|
428 | return false; |
|
|
429 | } |
|
|
430 | |
429 | void |
431 | void |
430 | vpn::ipv4_ev (io_watcher &w, short revents) |
432 | vpn::ipv4_ev (io_watcher &w, short revents) |
431 | { |
433 | { |
432 | if (revents & EVENT_READ) |
434 | if (revents & EVENT_READ) |
433 | { |
435 | { |
… | |
… | |
442 | |
444 | |
443 | if (len > 0) |
445 | if (len > 0) |
444 | { |
446 | { |
445 | pkt->len = len; |
447 | pkt->len = len; |
446 | |
448 | |
447 | // raw sockets deliver the ipv4, but don't expect it on sends |
449 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
448 | // this is slow, but... |
|
|
449 | pkt->skip_hdr (IP_OVERHEAD); |
450 | pkt->skip_hdr (IP_OVERHEAD); |
450 | |
451 | |
451 | recv_vpn_packet (pkt, si); |
452 | recv_vpn_packet (pkt, si); |
452 | } |
453 | } |
453 | else |
454 | else |
… | |
… | |
459 | delete pkt; |
460 | delete pkt; |
460 | } |
461 | } |
461 | else |
462 | else |
462 | { |
463 | { |
463 | slog (L_ERR, |
464 | slog (L_ERR, |
464 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
465 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
465 | revents); |
466 | revents); |
466 | exit (EXIT_FAILURE); |
467 | exit (EXIT_FAILURE); |
467 | } |
468 | } |
468 | } |
469 | } |
469 | |
470 | |
470 | #if ENABLE_ICMP |
471 | #if ENABLE_ICMP |
… | |
… | |
571 | int dst = mac2id (pkt->dst); |
572 | int dst = mac2id (pkt->dst); |
572 | int src = mac2id (pkt->src); |
573 | int src = mac2id (pkt->src); |
573 | |
574 | |
574 | if (src != THISNODE->id) |
575 | if (src != THISNODE->id) |
575 | { |
576 | { |
576 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
577 | slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
577 | exit (EXIT_FAILURE); |
578 | exit (EXIT_FAILURE); |
578 | } |
579 | } |
579 | |
580 | |
580 | if (dst == THISNODE->id) |
581 | if (dst == THISNODE->id) |
581 | { |
582 | { |
… | |
… | |
639 | connection_init (); |
640 | connection_init (); |
640 | |
641 | |
641 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
642 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
642 | i != conf.nodes.end (); ++i) |
643 | i != conf.nodes.end (); ++i) |
643 | { |
644 | { |
644 | connection *conn = new connection (this); |
645 | connection *conn = new connection (this, *i); |
645 | |
|
|
646 | conn->conf = *i; |
|
|
647 | conns.push_back (conn); |
646 | conns.push_back (conn); |
648 | |
|
|
649 | conn->establish_connection (); |
647 | conn->establish_connection (); |
650 | } |
648 | } |
651 | } |
649 | } |
652 | |
650 | |
653 | connection *vpn::find_router () |
651 | connection *vpn::find_router () |