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 | |
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5 | This file is part of GVPE. |
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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 | { |
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233 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
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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 | |
… | |
… | |
263 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
267 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
264 | |
268 | |
265 | reconnect_all (); |
269 | reconnect_all (); |
266 | |
270 | |
267 | return 0; |
271 | return 0; |
268 | } |
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269 | |
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270 | // send a vpn packet out to other hosts |
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271 | bool |
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272 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
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273 | { |
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274 | switch (si.prot) |
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275 | { |
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276 | case PROT_IPv4: |
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277 | return send_ipv4_packet (pkt, si, tos); |
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278 | |
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279 | case PROT_UDPv4: |
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280 | return send_udpv4_packet (pkt, si, tos); |
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281 | |
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282 | #if ENABLE_TCP |
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283 | case PROT_TCPv4: |
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284 | return send_tcpv4_packet (pkt, si, tos); |
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285 | #endif |
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286 | |
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287 | #if ENABLE_ICMP |
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288 | case PROT_ICMPv4: |
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289 | return send_icmpv4_packet (pkt, si, tos); |
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290 | #endif |
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291 | |
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292 | #if ENABLE_DNS |
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293 | case PROT_DNSv4: |
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294 | return send_dnsv4_packet (pkt, si, tos); |
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295 | #endif |
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296 | |
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297 | default: |
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298 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
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299 | return false; |
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300 | } |
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301 | } |
272 | } |
302 | |
273 | |
303 | bool |
274 | bool |
304 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
275 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
305 | { |
276 | { |
… | |
… | |
442 | |
413 | |
443 | if (len > 0) |
414 | if (len > 0) |
444 | { |
415 | { |
445 | pkt->len = len; |
416 | pkt->len = len; |
446 | |
417 | |
447 | // raw sockets deliver the ipv4, but don't expect it on sends |
418 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
448 | // this is slow, but... |
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449 | pkt->skip_hdr (IP_OVERHEAD); |
419 | pkt->skip_hdr (IP_OVERHEAD); |
450 | |
420 | |
451 | recv_vpn_packet (pkt, si); |
421 | recv_vpn_packet (pkt, si); |
452 | } |
422 | } |
453 | else |
423 | else |
… | |
… | |
459 | delete pkt; |
429 | delete pkt; |
460 | } |
430 | } |
461 | else |
431 | else |
462 | { |
432 | { |
463 | slog (L_ERR, |
433 | slog (L_ERR, |
464 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
434 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
465 | revents); |
435 | revents); |
466 | exit (EXIT_FAILURE); |
436 | exit (EXIT_FAILURE); |
467 | } |
437 | } |
468 | } |
438 | } |
469 | |
439 | |
470 | #if ENABLE_ICMP |
440 | #if ENABLE_ICMP |
… | |
… | |
571 | int dst = mac2id (pkt->dst); |
541 | int dst = mac2id (pkt->dst); |
572 | int src = mac2id (pkt->src); |
542 | int src = mac2id (pkt->src); |
573 | |
543 | |
574 | if (src != THISNODE->id) |
544 | if (src != THISNODE->id) |
575 | { |
545 | { |
576 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
546 | slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
577 | exit (EXIT_FAILURE); |
547 | exit (EXIT_FAILURE); |
578 | } |
548 | } |
579 | |
549 | |
580 | if (dst == THISNODE->id) |
550 | if (dst == THISNODE->id) |
581 | { |
551 | { |
… | |
… | |
639 | connection_init (); |
609 | connection_init (); |
640 | |
610 | |
641 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
611 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
642 | i != conf.nodes.end (); ++i) |
612 | i != conf.nodes.end (); ++i) |
643 | { |
613 | { |
644 | connection *conn = new connection (this); |
614 | connection *conn = new connection (this, *i); |
645 | |
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646 | conn->conf = *i; |
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647 | conns.push_back (conn); |
615 | conns.push_back (conn); |
648 | |
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649 | conn->establish_connection (); |
616 | conn->establish_connection (); |
650 | } |
617 | } |
651 | } |
618 | } |
652 | |
619 | |
653 | connection *vpn::find_router () |
620 | connection *vpn::find_router () |