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 | |
22 | #include <list> |
24 | #include <list> |
23 | |
25 | |
|
|
26 | #include <cstdio> |
|
|
27 | #include <cstring> |
24 | #include <cstdlib> |
28 | #include <cstdlib> |
25 | #include <cstring> |
|
|
26 | #include <cstdio> |
|
|
27 | |
29 | |
28 | #include <sys/types.h> |
30 | #include <sys/types.h> |
29 | #include <sys/socket.h> |
31 | #include <sys/socket.h> |
30 | #include <sys/wait.h> |
32 | #include <sys/wait.h> |
31 | #include <errno.h> |
33 | #include <errno.h> |
… | |
… | |
98 | sockinfo si (THISNODE, PROT_IPv4); |
100 | sockinfo si (THISNODE, PROT_IPv4); |
99 | |
101 | |
100 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
102 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
101 | { |
103 | { |
102 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
104 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
103 | exit (1); |
105 | exit (EXIT_FAILURE); |
104 | } |
106 | } |
105 | |
107 | |
106 | ipv4_ev_watcher.start (ipv4_fd, EVENT_READ); |
108 | ipv4_ev_watcher.start (ipv4_fd, EVENT_READ); |
107 | } |
109 | } |
108 | |
110 | |
… | |
… | |
136 | sockinfo si (THISNODE, PROT_UDPv4); |
138 | sockinfo si (THISNODE, PROT_UDPv4); |
137 | |
139 | |
138 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
140 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
139 | { |
141 | { |
140 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
142 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
141 | exit (1); |
143 | exit (EXIT_FAILURE); |
142 | } |
144 | } |
143 | |
145 | |
144 | udpv4_ev_watcher.start (udpv4_fd, EVENT_READ); |
146 | udpv4_ev_watcher.start (udpv4_fd, EVENT_READ); |
145 | } |
147 | } |
146 | |
148 | |
… | |
… | |
180 | sockinfo si (THISNODE, PROT_ICMPv4); |
182 | sockinfo si (THISNODE, PROT_ICMPv4); |
181 | |
183 | |
182 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
184 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
183 | { |
185 | { |
184 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
186 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
185 | exit (1); |
187 | exit (EXIT_FAILURE); |
186 | } |
188 | } |
187 | |
189 | |
188 | icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ); |
190 | icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ); |
189 | } |
191 | } |
190 | #endif |
192 | #endif |
… | |
… | |
210 | sockinfo si (THISNODE, PROT_TCPv4); |
212 | sockinfo si (THISNODE, PROT_TCPv4); |
211 | |
213 | |
212 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
214 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
213 | { |
215 | { |
214 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
216 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
215 | exit (1); |
217 | exit (EXIT_FAILURE); |
216 | } |
218 | } |
217 | |
219 | |
218 | if (listen (tcpv4_fd, 5)) |
220 | if (listen (tcpv4_fd, 5)) |
219 | { |
221 | { |
220 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
222 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
221 | exit (1); |
223 | exit (EXIT_FAILURE); |
222 | } |
224 | } |
223 | |
225 | |
224 | tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ); |
226 | tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ); |
|
|
227 | } |
|
|
228 | #endif |
|
|
229 | |
|
|
230 | #if ENABLE_DNS |
|
|
231 | if (THISNODE->protocols & PROT_DNSv4) |
|
|
232 | { |
|
|
233 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
|
|
234 | |
|
|
235 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
|
|
236 | |
|
|
237 | if (dnsv4_fd < 0) |
|
|
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 |
|
|
249 | |
|
|
250 | // standard daemon practise... |
|
|
251 | { |
|
|
252 | int oval = 1; |
|
|
253 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
|
|
254 | } |
|
|
255 | |
|
|
256 | sockinfo si (THISNODE->dns_hostname, |
|
|
257 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
|
|
258 | PROT_DNSv4); |
|
|
259 | |
|
|
260 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
|
|
261 | { |
|
|
262 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
|
|
263 | exit (EXIT_FAILURE); |
|
|
264 | } |
|
|
265 | |
|
|
266 | dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ); |
225 | } |
267 | } |
226 | #endif |
268 | #endif |
227 | |
269 | |
228 | tap = new tap_device (); |
270 | tap = new tap_device (); |
229 | if (!tap) //D this, of course, never catches |
271 | if (!tap) //D this, of course, never catches |
230 | { |
272 | { |
231 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
273 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
232 | exit (1); |
274 | exit (EXIT_FAILURE); |
233 | } |
275 | } |
234 | |
276 | |
235 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
277 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
236 | |
278 | |
237 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
279 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
238 | |
280 | |
239 | reconnect_all (); |
281 | reconnect_all (); |
240 | |
282 | |
241 | return 0; |
283 | return 0; |
242 | } |
|
|
243 | |
|
|
244 | // send a vpn packet out to other hosts |
|
|
245 | bool |
|
|
246 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
247 | { |
|
|
248 | switch (si.prot) |
|
|
249 | { |
|
|
250 | case PROT_IPv4: |
|
|
251 | return send_ipv4_packet (pkt, si, tos); |
|
|
252 | |
|
|
253 | case PROT_UDPv4: |
|
|
254 | return send_udpv4_packet (pkt, si, tos); |
|
|
255 | |
|
|
256 | #if ENABLE_TCP |
|
|
257 | case PROT_TCPv4: |
|
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258 | return send_tcpv4_packet (pkt, si, tos); |
|
|
259 | #endif |
|
|
260 | |
|
|
261 | #if ENABLE_ICMP |
|
|
262 | case PROT_ICMPv4: |
|
|
263 | return send_icmpv4_packet (pkt, si, tos); |
|
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264 | #endif |
|
|
265 | |
|
|
266 | default: |
|
|
267 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
268 | return false; |
|
|
269 | } |
|
|
270 | } |
284 | } |
271 | |
285 | |
272 | bool |
286 | bool |
273 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
287 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
274 | { |
288 | { |
… | |
… | |
393 | else |
407 | else |
394 | c->recv_vpn_packet (pkt, rsi); |
408 | c->recv_vpn_packet (pkt, rsi); |
395 | } |
409 | } |
396 | } |
410 | } |
397 | |
411 | |
|
|
412 | bool |
|
|
413 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
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414 | { |
|
|
415 | switch (si.prot) |
|
|
416 | { |
|
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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 | |
398 | void |
441 | void |
399 | vpn::ipv4_ev (io_watcher &w, short revents) |
442 | vpn::ipv4_ev (io_watcher &w, short revents) |
400 | { |
443 | { |
401 | if (revents & EVENT_READ) |
444 | if (revents & EVENT_READ) |
402 | { |
445 | { |
… | |
… | |
411 | |
454 | |
412 | if (len > 0) |
455 | if (len > 0) |
413 | { |
456 | { |
414 | pkt->len = len; |
457 | pkt->len = len; |
415 | |
458 | |
416 | // 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 |
417 | // this is slow, but... |
|
|
418 | pkt->skip_hdr (IP_OVERHEAD); |
460 | pkt->skip_hdr (IP_OVERHEAD); |
419 | |
461 | |
420 | recv_vpn_packet (pkt, si); |
462 | recv_vpn_packet (pkt, si); |
421 | } |
463 | } |
422 | else |
464 | else |
… | |
… | |
428 | delete pkt; |
470 | delete pkt; |
429 | } |
471 | } |
430 | else |
472 | else |
431 | { |
473 | { |
432 | slog (L_ERR, |
474 | slog (L_ERR, |
433 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
475 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
434 | revents); |
476 | revents); |
435 | exit (1); |
477 | exit (EXIT_FAILURE); |
436 | } |
478 | } |
437 | } |
479 | } |
438 | |
480 | |
439 | #if ENABLE_ICMP |
481 | #if ENABLE_ICMP |
440 | void |
482 | void |
… | |
… | |
478 | else |
520 | else |
479 | { |
521 | { |
480 | slog (L_ERR, |
522 | slog (L_ERR, |
481 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
523 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
482 | revents); |
524 | revents); |
483 | exit (1); |
525 | exit (EXIT_FAILURE); |
484 | } |
526 | } |
485 | } |
527 | } |
486 | #endif |
528 | #endif |
487 | |
529 | |
488 | void |
530 | void |
… | |
… | |
516 | else |
558 | else |
517 | { |
559 | { |
518 | slog (L_ERR, |
560 | slog (L_ERR, |
519 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
561 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
520 | revents); |
562 | revents); |
521 | exit (1); |
563 | exit (EXIT_FAILURE); |
522 | } |
564 | } |
523 | } |
565 | } |
524 | |
566 | |
525 | void |
567 | void |
526 | vpn::tap_ev (io_watcher &w, short revents) |
568 | vpn::tap_ev (io_watcher &w, short revents) |
… | |
… | |
540 | int dst = mac2id (pkt->dst); |
582 | int dst = mac2id (pkt->dst); |
541 | int src = mac2id (pkt->src); |
583 | int src = mac2id (pkt->src); |
542 | |
584 | |
543 | if (src != THISNODE->id) |
585 | if (src != THISNODE->id) |
544 | { |
586 | { |
545 | 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.")); |
546 | exit (1); |
588 | exit (EXIT_FAILURE); |
547 | } |
589 | } |
548 | |
590 | |
549 | if (dst == THISNODE->id) |
591 | if (dst == THISNODE->id) |
550 | { |
592 | { |
551 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
593 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
552 | exit (1); |
594 | exit (EXIT_FAILURE); |
553 | } |
595 | } |
554 | |
596 | |
555 | if (dst > conns.size ()) |
597 | if (dst > conns.size ()) |
556 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
598 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
557 | else |
599 | else |
… | |
… | |
572 | if (events & EVENT_SHUTDOWN) |
614 | if (events & EVENT_SHUTDOWN) |
573 | { |
615 | { |
574 | slog (L_INFO, _("preparing shutdown...")); |
616 | slog (L_INFO, _("preparing shutdown...")); |
575 | |
617 | |
576 | shutdown_all (); |
618 | shutdown_all (); |
577 | remove_pid (pidfilename); |
619 | remove_pid (conf.pidfilename); |
578 | slog (L_INFO, _("terminating")); |
620 | slog (L_INFO, _("terminating")); |
579 | exit (0); |
621 | exit (EXIT_SUCCESS); |
580 | } |
622 | } |
581 | |
623 | |
582 | if (events & EVENT_RECONNECT) |
624 | if (events & EVENT_RECONNECT) |
583 | { |
625 | { |
584 | slog (L_INFO, _("forced reconnect")); |
626 | slog (L_INFO, _("forced reconnect")); |
… | |
… | |
608 | connection_init (); |
650 | connection_init (); |
609 | |
651 | |
610 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
652 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
611 | i != conf.nodes.end (); ++i) |
653 | i != conf.nodes.end (); ++i) |
612 | { |
654 | { |
613 | connection *conn = new connection (this); |
655 | connection *conn = new connection (this, *i); |
614 | |
|
|
615 | conn->conf = *i; |
|
|
616 | conns.push_back (conn); |
656 | conns.push_back (conn); |
617 | |
|
|
618 | conn->establish_connection (); |
657 | conn->establish_connection (); |
619 | } |
658 | } |
620 | } |
659 | } |
621 | |
660 | |
622 | connection *vpn::find_router () |
661 | connection *vpn::find_router () |
… | |
… | |
685 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
724 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
686 | #endif |
725 | #endif |
687 | #if ENABLE_ICMP |
726 | #if ENABLE_ICMP |
688 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
727 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
689 | #endif |
728 | #endif |
|
|
729 | #if ENABLE_DNS |
|
|
730 | , dnsv4_ev_watcher (this, &vpn::dnsv4_ev) |
|
|
731 | #endif |
690 | , tap_ev_watcher (this, &vpn::tap_ev) |
732 | , tap_ev_watcher (this, &vpn::tap_ev) |
691 | { |
733 | { |
692 | } |
734 | } |
693 | |
735 | |
694 | vpn::~vpn () |
736 | vpn::~vpn () |