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Comparing gvpe/src/vpn.C (file contents):
Revision 1.25 by pcg, Sun Jul 25 18:11:40 2004 UTC vs.
Revision 1.32 by pcg, Mon Mar 7 01:31:26 2005 UTC

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;
239
240#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
241 // this I really consider a linux bug. I am neither connected
242 // nor do I fragment myself. Linux still sets DF and doesn't
243 // fragment for me sometimes.
244 {
245 int oval = IP_PMTUDISC_DONT;
246 setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
247 }
248#endif
235 249
236 // standard daemon practise... 250 // standard daemon practise...
237 { 251 {
238 int oval = 1; 252 int oval = 1;
239 setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); 253 setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
240 } 254 }
241 255
242 sockinfo si (THISNODE, PROT_DNSv4); 256 sockinfo si (THISNODE->dns_hostname,
257 THISNODE->dns_hostname ? THISNODE->dns_port : 0,
258 PROT_DNSv4);
243 259
244 if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) 260 if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
245 { 261 {
246 slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); 262 slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
247 exit (EXIT_FAILURE); 263 exit (EXIT_FAILURE);
… …
263 tap_ev_watcher.start (tap->fd, EVENT_READ); 279 tap_ev_watcher.start (tap->fd, EVENT_READ);
264 280
265 reconnect_all (); 281 reconnect_all ();
266 282
267 return 0; 283 return 0;
268}
269
270// send a vpn packet out to other hosts
271bool
272vpn::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} 284}
302 285
303bool 286bool
304vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) 287vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
305{ 288{
… …
424 else 407 else
425 c->recv_vpn_packet (pkt, rsi); 408 c->recv_vpn_packet (pkt, rsi);
426 } 409 }
427} 410}
428 411
412bool
413vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
414{
415 switch (si.prot)
416 {
417 case PROT_IPv4:
418 return send_ipv4_packet (pkt, si, tos);
419 case PROT_UDPv4:
420 return send_udpv4_packet (pkt, si, tos);
421#if ENABLE_TCP
422 case PROT_TCPv4:
423 return send_tcpv4_packet (pkt, si, tos);
424#endif
425#if ENABLE_ICMP
426 case PROT_ICMPv4:
427 return send_icmpv4_packet (pkt, si, tos);
428#endif
429#if ENABLE_DNS
430 case PROT_DNSv4:
431 return send_dnsv4_packet (pkt, si, tos);
432#endif
433
434 default:
435 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
436 }
437
438 return false;
439}
440
429void 441void
430vpn::ipv4_ev (io_watcher &w, short revents) 442vpn::ipv4_ev (io_watcher &w, short revents)
431{ 443{
432 if (revents & EVENT_READ) 444 if (revents & EVENT_READ)
433 { 445 {
… …
442 454
443 if (len > 0) 455 if (len > 0)
444 { 456 {
445 pkt->len = len; 457 pkt->len = len;
446 458
447 // raw sockets deliver the ipv4, but don't expect it on sends 459 // raw sockets deliver the ipv4 header, but don't expect it on sends
448 // this is slow, but...
449 pkt->skip_hdr (IP_OVERHEAD); 460 pkt->skip_hdr (IP_OVERHEAD);
450 461
451 recv_vpn_packet (pkt, si); 462 recv_vpn_packet (pkt, si);
452 } 463 }
453 else 464 else
… …
459 delete pkt; 470 delete pkt;
460 } 471 }
461 else 472 else
462 { 473 {
463 slog (L_ERR, 474 slog (L_ERR,
464 _("FATAL: unknown revents %08x in socket, terminating\n"), 475 _("FATAL: unknown revents %08x in socket, terminating\n"),
465 revents); 476 revents);
466 exit (EXIT_FAILURE); 477 exit (EXIT_FAILURE);
467 } 478 }
468} 479}
469 480
470#if ENABLE_ICMP 481#if ENABLE_ICMP
… …
571 int dst = mac2id (pkt->dst); 582 int dst = mac2id (pkt->dst);
572 int src = mac2id (pkt->src); 583 int src = mac2id (pkt->src);
573 584
574 if (src != THISNODE->id) 585 if (src != THISNODE->id)
575 { 586 {
576 slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); 587 slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
577 exit (EXIT_FAILURE); 588 exit (EXIT_FAILURE);
578 } 589 }
579 590
580 if (dst == THISNODE->id) 591 if (dst == THISNODE->id)
581 { 592 {
… …
639 connection_init (); 650 connection_init ();
640 651
641 for (configuration::node_vector::iterator i = conf.nodes.begin (); 652 for (configuration::node_vector::iterator i = conf.nodes.begin ();
642 i != conf.nodes.end (); ++i) 653 i != conf.nodes.end (); ++i)
643 { 654 {
644 connection *conn = new connection (this); 655 connection *conn = new connection (this, *i);
645
646 conn->conf = *i;
647 conns.push_back (conn); 656 conns.push_back (conn);
648
649 conn->establish_connection (); 657 conn->establish_connection ();
650 } 658 }
651} 659}
652 660
653connection *vpn::find_router () 661connection *vpn::find_router ()
654{ 662{
655 u32 prio = 0; 663 u32 prio = 1;
656 connection *router = 0; 664 connection *router = 0;
657 665
658 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) 666 for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
659 { 667 {
660 connection *c = *i; 668 connection *c = *i;

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