1 | /* |
1 | /* |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
3 | Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> |
3 | Copyright (C) 2003-2007 Marc Lehmann <gvpe@schmorp.de> |
4 | |
4 | |
5 | This file is part of GVPE. |
5 | This file is part of GVPE. |
6 | |
6 | |
7 | GVPE is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify |
8 | 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 |
… | |
… | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
15 | GNU General Public License for more details. |
15 | GNU General Public License for more details. |
16 | |
16 | |
17 | 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 |
18 | along with gvpe; if not, write to the Free Software |
18 | along with gvpe; if not, write to the Free Software |
19 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
20 | */ |
20 | */ |
21 | |
21 | |
22 | #include "config.h" |
22 | #include "config.h" |
23 | |
23 | |
24 | #include <list> |
24 | #include <list> |
… | |
… | |
46 | |
46 | |
47 | vpn network; // THE vpn (bad design...) |
47 | vpn network; // THE vpn (bad design...) |
48 | |
48 | |
49 | ///////////////////////////////////////////////////////////////////////////// |
49 | ///////////////////////////////////////////////////////////////////////////// |
50 | |
50 | |
|
|
51 | static void inline |
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|
52 | set_tos (int fd, int &tos_prev, int tos) |
|
|
53 | { |
|
|
54 | #if defined(SOL_IP) && defined(IP_TOS) |
|
|
55 | if (tos_prev == tos) |
|
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56 | return; |
|
|
57 | |
|
|
58 | tos_prev = tos; |
|
|
59 | setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
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60 | #endif |
|
|
61 | } |
|
|
62 | |
51 | void |
63 | void |
52 | vpn::script_init_env () |
64 | vpn::script_init_env () |
53 | { |
65 | { |
54 | // the tunnel device mtu should be the physical mtu - overhead |
66 | // the tunnel device mtu should be the physical mtu - overhead |
55 | // the tricky part is rounding to the cipher key blocksize |
67 | // the tricky part is rounding to the cipher key blocksize |
… | |
… | |
98 | } |
110 | } |
99 | |
111 | |
100 | int |
112 | int |
101 | vpn::setup () |
113 | vpn::setup () |
102 | { |
114 | { |
|
|
115 | ipv4_tos = -1; |
103 | ipv4_fd = -1; |
116 | ipv4_fd = -1; |
104 | |
117 | |
105 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
118 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
106 | { |
119 | { |
107 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
120 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
108 | |
121 | |
… | |
… | |
128 | { |
141 | { |
129 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
142 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
130 | exit (EXIT_FAILURE); |
143 | exit (EXIT_FAILURE); |
131 | } |
144 | } |
132 | |
145 | |
133 | ipv4_ev_watcher.start (ipv4_fd, EVENT_READ); |
146 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
134 | } |
147 | } |
135 | |
148 | |
|
|
149 | udpv4_tos = -1; |
136 | udpv4_fd = -1; |
150 | udpv4_fd = -1; |
137 | |
151 | |
138 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
152 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
139 | { |
153 | { |
140 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
154 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
141 | |
155 | |
… | |
… | |
167 | { |
181 | { |
168 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
182 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
169 | exit (EXIT_FAILURE); |
183 | exit (EXIT_FAILURE); |
170 | } |
184 | } |
171 | |
185 | |
172 | udpv4_ev_watcher.start (udpv4_fd, EVENT_READ); |
186 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
173 | } |
187 | } |
174 | |
188 | |
|
|
189 | icmpv4_tos = -1; |
175 | icmpv4_fd = -1; |
190 | icmpv4_fd = -1; |
176 | |
191 | |
177 | #if ENABLE_ICMP |
192 | #if ENABLE_ICMP |
178 | if (THISNODE->protocols & PROT_ICMPv4) |
193 | if (THISNODE->protocols & PROT_ICMPv4) |
179 | { |
194 | { |
180 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
195 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
… | |
… | |
212 | { |
227 | { |
213 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
228 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
214 | exit (EXIT_FAILURE); |
229 | exit (EXIT_FAILURE); |
215 | } |
230 | } |
216 | |
231 | |
217 | icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ); |
232 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
218 | } |
233 | } |
219 | #endif |
234 | #endif |
220 | |
235 | |
221 | tcpv4_fd = -1; |
236 | tcpv4_fd = -1; |
222 | |
237 | |
… | |
… | |
249 | { |
264 | { |
250 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
265 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
251 | exit (EXIT_FAILURE); |
266 | exit (EXIT_FAILURE); |
252 | } |
267 | } |
253 | |
268 | |
254 | tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ); |
269 | tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
255 | } |
270 | } |
256 | #endif |
271 | #endif |
|
|
272 | |
|
|
273 | dnsv4_tos = -1; |
|
|
274 | dnsv4_fd = -1; |
257 | |
275 | |
258 | #if ENABLE_DNS |
276 | #if ENABLE_DNS |
259 | if (THISNODE->protocols & PROT_DNSv4) |
277 | if (THISNODE->protocols & PROT_DNSv4) |
260 | { |
278 | { |
261 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
279 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
… | |
… | |
292 | { |
310 | { |
293 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
311 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
294 | exit (EXIT_FAILURE); |
312 | exit (EXIT_FAILURE); |
295 | } |
313 | } |
296 | |
314 | |
297 | dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ); |
315 | dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
298 | } |
316 | } |
299 | #endif |
317 | #endif |
300 | |
318 | |
301 | ///////////////////////////////////////////////////////////////////////////// |
319 | ///////////////////////////////////////////////////////////////////////////// |
302 | |
320 | |
… | |
… | |
311 | exit (EXIT_FAILURE); |
329 | exit (EXIT_FAILURE); |
312 | } |
330 | } |
313 | |
331 | |
314 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
332 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
315 | |
333 | |
|
|
334 | run_script_cb cb; |
|
|
335 | |
|
|
336 | callback_set (cb, this, vpn, script_if_init); |
316 | if (tap->if_up () && |
337 | if (tap->if_up () && |
317 | !run_script (run_script_cb (this, &vpn::script_if_init), true)) |
338 | !run_script (cb, true)) |
318 | { |
339 | { |
319 | slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
340 | slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
320 | tap->if_up ()); |
341 | tap->if_up ()); |
321 | exit (EXIT_FAILURE); |
342 | exit (EXIT_FAILURE); |
322 | } |
343 | } |
323 | |
344 | |
324 | if (!run_script (run_script_cb (this, &vpn::script_if_up), true)) |
345 | callback_set (cb, this, vpn, script_if_up); |
|
|
346 | if (!run_script (cb, true)) |
325 | { |
347 | { |
326 | slog (L_ERR, _("if-up command execution failed, exiting.")); |
348 | slog (L_ERR, _("if-up command execution failed, exiting.")); |
327 | exit (EXIT_FAILURE); |
349 | exit (EXIT_FAILURE); |
328 | } |
350 | } |
329 | |
351 | |
330 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
352 | tap_ev_watcher.start (tap->fd, EV_READ); |
331 | |
353 | |
332 | return 0; |
354 | return 0; |
333 | } |
355 | } |
334 | |
356 | |
335 | bool |
357 | bool |
336 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
358 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
337 | { |
359 | { |
338 | #if defined(SOL_IP) && defined(IP_TOS) |
360 | set_tos (ipv4_fd, ipv4_tos, tos); |
339 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
340 | #endif |
|
|
341 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
361 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
342 | |
362 | |
343 | return true; |
363 | return true; |
344 | } |
364 | } |
345 | |
365 | |
… | |
… | |
368 | |
388 | |
369 | #if ENABLE_ICMP |
389 | #if ENABLE_ICMP |
370 | bool |
390 | bool |
371 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
391 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
372 | { |
392 | { |
373 | #if defined(SOL_IP) && defined(IP_TOS) |
|
|
374 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
375 | #endif |
|
|
376 | |
|
|
377 | pkt->unshift_hdr (4); |
393 | pkt->unshift_hdr (4); |
378 | |
394 | |
379 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
395 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
380 | hdr->type = ::conf.icmp_type; |
396 | hdr->type = ::conf.icmp_type; |
381 | hdr->code = 255; |
397 | hdr->code = 255; |
382 | hdr->checksum = 0; |
398 | hdr->checksum = 0; |
383 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
399 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
384 | |
400 | |
|
|
401 | set_tos (icmpv4_fd, icmpv4_tos, tos); |
385 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
402 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
386 | |
403 | |
387 | return true; |
404 | return true; |
388 | } |
405 | } |
389 | #endif |
406 | #endif |
390 | |
407 | |
391 | bool |
408 | bool |
392 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
409 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
393 | { |
410 | { |
394 | #if defined(SOL_IP) && defined(IP_TOS) |
411 | set_tos (udpv4_fd, udpv4_tos, tos); |
395 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
396 | #endif |
|
|
397 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
412 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
398 | |
413 | |
399 | return true; |
414 | return true; |
400 | } |
415 | } |
401 | |
416 | |
… | |
… | |
463 | { |
478 | { |
464 | switch (si.prot) |
479 | switch (si.prot) |
465 | { |
480 | { |
466 | case PROT_IPv4: |
481 | case PROT_IPv4: |
467 | return send_ipv4_packet (pkt, si, tos); |
482 | return send_ipv4_packet (pkt, si, tos); |
|
|
483 | |
468 | case PROT_UDPv4: |
484 | case PROT_UDPv4: |
469 | return send_udpv4_packet (pkt, si, tos); |
485 | return send_udpv4_packet (pkt, si, tos); |
|
|
486 | |
470 | #if ENABLE_TCP |
487 | #if ENABLE_TCP |
471 | case PROT_TCPv4: |
488 | case PROT_TCPv4: |
472 | return send_tcpv4_packet (pkt, si, tos); |
489 | return send_tcpv4_packet (pkt, si, tos); |
473 | #endif |
490 | #endif |
474 | #if ENABLE_ICMP |
491 | #if ENABLE_ICMP |
… | |
… | |
477 | #endif |
494 | #endif |
478 | #if ENABLE_DNS |
495 | #if ENABLE_DNS |
479 | case PROT_DNSv4: |
496 | case PROT_DNSv4: |
480 | return send_dnsv4_packet (pkt, si, tos); |
497 | return send_dnsv4_packet (pkt, si, tos); |
481 | #endif |
498 | #endif |
482 | |
|
|
483 | default: |
499 | default: |
484 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
500 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
485 | } |
501 | } |
486 | |
502 | |
487 | return false; |
503 | return false; |
488 | } |
504 | } |
489 | |
505 | |
490 | void |
506 | void |
491 | vpn::ipv4_ev (io_watcher &w, short revents) |
507 | vpn::ipv4_ev (ev::io &w, int revents) |
492 | { |
508 | { |
493 | if (revents & EVENT_READ) |
509 | if (revents & EV_READ) |
494 | { |
510 | { |
495 | vpn_packet *pkt = new vpn_packet; |
511 | vpn_packet *pkt = new vpn_packet; |
496 | struct sockaddr_in sa; |
512 | struct sockaddr_in sa; |
497 | socklen_t sa_len = sizeof (sa); |
513 | socklen_t sa_len = sizeof (sa); |
498 | int len; |
514 | int len; |
… | |
… | |
527 | } |
543 | } |
528 | } |
544 | } |
529 | |
545 | |
530 | #if ENABLE_ICMP |
546 | #if ENABLE_ICMP |
531 | void |
547 | void |
532 | vpn::icmpv4_ev (io_watcher &w, short revents) |
548 | vpn::icmpv4_ev (ev::io &w, int revents) |
533 | { |
549 | { |
534 | if (revents & EVENT_READ) |
550 | if (revents & EV_READ) |
535 | { |
551 | { |
536 | vpn_packet *pkt = new vpn_packet; |
552 | vpn_packet *pkt = new vpn_packet; |
537 | struct sockaddr_in sa; |
553 | struct sockaddr_in sa; |
538 | socklen_t sa_len = sizeof (sa); |
554 | socklen_t sa_len = sizeof (sa); |
539 | int len; |
555 | int len; |
… | |
… | |
575 | } |
591 | } |
576 | } |
592 | } |
577 | #endif |
593 | #endif |
578 | |
594 | |
579 | void |
595 | void |
580 | vpn::udpv4_ev (io_watcher &w, short revents) |
596 | vpn::udpv4_ev (ev::io &w, int revents) |
581 | { |
597 | { |
582 | if (revents & EVENT_READ) |
598 | if (revents & EV_READ) |
583 | { |
599 | { |
584 | vpn_packet *pkt = new vpn_packet; |
600 | vpn_packet *pkt = new vpn_packet; |
585 | struct sockaddr_in sa; |
601 | struct sockaddr_in sa; |
586 | socklen_t sa_len = sizeof (sa); |
602 | socklen_t sa_len = sizeof (sa); |
587 | int len; |
603 | int len; |
… | |
… | |
612 | exit (EXIT_FAILURE); |
628 | exit (EXIT_FAILURE); |
613 | } |
629 | } |
614 | } |
630 | } |
615 | |
631 | |
616 | void |
632 | void |
617 | vpn::tap_ev (io_watcher &w, short revents) |
633 | vpn::tap_ev (ev::io &w, int revents) |
618 | { |
634 | { |
619 | if (revents & EVENT_READ) |
635 | if (revents & EV_READ) |
620 | { |
636 | { |
621 | /* process data */ |
637 | /* process data */ |
622 | tap_packet *pkt; |
638 | tap_packet *pkt; |
623 | |
639 | |
624 | pkt = tap->recv (); |
640 | pkt = tap->recv (); |
… | |
… | |
654 | else |
670 | else |
655 | abort (); |
671 | abort (); |
656 | } |
672 | } |
657 | |
673 | |
658 | void |
674 | void |
659 | vpn::event_cb (time_watcher &w) |
675 | vpn::event_cb (ev::timer &w, int) |
660 | { |
676 | { |
661 | if (events) |
677 | if (events) |
662 | { |
678 | { |
663 | if (events & EVENT_SHUTDOWN) |
679 | if (events & EVENT_SHUTDOWN) |
664 | { |
680 | { |
… | |
… | |
755 | } |
771 | } |
756 | |
772 | |
757 | void |
773 | void |
758 | vpn::dump_status () |
774 | vpn::dump_status () |
759 | { |
775 | { |
760 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); |
776 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ()); |
761 | |
777 | |
762 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
778 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
763 | (*c)->dump_status (); |
779 | (*c)->dump_status (); |
764 | |
780 | |
765 | slog (L_NOTICE, _("END status dump")); |
781 | slog (L_NOTICE, _("END status dump")); |