1 | /* |
1 | /* |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
3 | Copyright (C) 2003 Marc Lehmann <pcg@goof.com> |
3 | Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com> |
4 | |
4 | |
5 | This program is free software; you can redistribute it and/or modify |
5 | This program is free software; you can redistribute it and/or modify |
6 | it under the terms of the GNU General Public License as published by |
6 | 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 |
7 | the Free Software Foundation; either version 2 of the License, or |
8 | (at your option) any later version. |
8 | (at your option) any later version. |
… | |
… | |
19 | |
19 | |
20 | #include "config.h" |
20 | #include "config.h" |
21 | |
21 | |
22 | #include <list> |
22 | #include <list> |
23 | |
23 | |
|
|
24 | #include <cstdio> |
|
|
25 | #include <cstring> |
24 | #include <cstdlib> |
26 | #include <cstdlib> |
25 | #include <cstring> |
|
|
26 | #include <cstdio> |
|
|
27 | |
27 | |
28 | #include <sys/types.h> |
28 | #include <sys/types.h> |
29 | #include <sys/socket.h> |
29 | #include <sys/socket.h> |
30 | #include <sys/wait.h> |
30 | #include <sys/wait.h> |
31 | #include <errno.h> |
31 | #include <errno.h> |
… | |
… | |
54 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
54 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
55 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
55 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
56 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
56 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
57 | |
57 | |
58 | char *env; |
58 | char *env; |
59 | asprintf (&env, "CONFBASE=%s", confbase); |
59 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
60 | putenv (env); |
|
|
61 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); |
60 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env); |
62 | putenv (env); |
|
|
63 | asprintf (&env, "NODEID=%d", THISNODE->id); |
61 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
64 | putenv (env); |
|
|
65 | asprintf (&env, "IFNAME=%s", tap->interface ()); |
62 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
66 | putenv (env); |
63 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
|
|
64 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
67 | asprintf (&env, "MTU=%d", mtu); |
65 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
68 | putenv (env); |
|
|
69 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
66 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
70 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
67 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
71 | THISNODE->id & 0xff); |
68 | THISNODE->id & 0xff); |
72 | putenv (env); |
69 | putenv (env); |
73 | |
70 | |
… | |
… | |
101 | sockinfo si (THISNODE, PROT_IPv4); |
98 | sockinfo si (THISNODE, PROT_IPv4); |
102 | |
99 | |
103 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
100 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
104 | { |
101 | { |
105 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
102 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
106 | exit (1); |
103 | exit (EXIT_FAILURE); |
107 | } |
104 | } |
108 | |
105 | |
109 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
106 | ipv4_ev_watcher.start (ipv4_fd, EVENT_READ); |
110 | } |
107 | } |
111 | |
108 | |
112 | udpv4_fd = -1; |
109 | udpv4_fd = -1; |
113 | |
110 | |
114 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
111 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
… | |
… | |
139 | sockinfo si (THISNODE, PROT_UDPv4); |
136 | sockinfo si (THISNODE, PROT_UDPv4); |
140 | |
137 | |
141 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
138 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
142 | { |
139 | { |
143 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
140 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
144 | exit (1); |
141 | exit (EXIT_FAILURE); |
145 | } |
142 | } |
146 | |
143 | |
147 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
144 | udpv4_ev_watcher.start (udpv4_fd, EVENT_READ); |
148 | } |
145 | } |
149 | |
146 | |
150 | icmpv4_fd = -1; |
147 | icmpv4_fd = -1; |
151 | |
148 | |
152 | #if ENABLE_ICMP |
149 | #if ENABLE_ICMP |
… | |
… | |
183 | sockinfo si (THISNODE, PROT_ICMPv4); |
180 | sockinfo si (THISNODE, PROT_ICMPv4); |
184 | |
181 | |
185 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
182 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
186 | { |
183 | { |
187 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
184 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
188 | exit (1); |
185 | exit (EXIT_FAILURE); |
189 | } |
186 | } |
190 | |
187 | |
191 | icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); |
188 | icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ); |
192 | } |
189 | } |
193 | #endif |
190 | #endif |
194 | |
191 | |
195 | tcpv4_fd = -1; |
192 | tcpv4_fd = -1; |
196 | |
193 | |
… | |
… | |
213 | sockinfo si (THISNODE, PROT_TCPv4); |
210 | sockinfo si (THISNODE, PROT_TCPv4); |
214 | |
211 | |
215 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
212 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
216 | { |
213 | { |
217 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
214 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
218 | exit (1); |
215 | exit (EXIT_FAILURE); |
219 | } |
216 | } |
220 | |
217 | |
221 | if (listen (tcpv4_fd, 5)) |
218 | if (listen (tcpv4_fd, 5)) |
222 | { |
219 | { |
223 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
220 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
224 | exit (1); |
221 | exit (EXIT_FAILURE); |
|
|
222 | } |
|
|
223 | |
|
|
224 | tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ); |
|
|
225 | } |
|
|
226 | #endif |
|
|
227 | |
|
|
228 | #if ENABLE_DNS |
|
|
229 | if (THISNODE->protocols & PROT_DNSv4) |
|
|
230 | { |
|
|
231 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
|
|
232 | |
|
|
233 | if (dnsv4_fd < 0) |
|
|
234 | return -1; |
|
|
235 | |
|
|
236 | // standard daemon practise... |
|
|
237 | { |
|
|
238 | int oval = 1; |
|
|
239 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
|
|
240 | } |
|
|
241 | |
|
|
242 | sockinfo si (THISNODE, PROT_DNSv4); |
|
|
243 | |
|
|
244 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
225 | } |
245 | { |
|
|
246 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
|
|
247 | exit (EXIT_FAILURE); |
|
|
248 | } |
226 | |
249 | |
227 | tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
250 | dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ); |
228 | } |
251 | } |
229 | #endif |
252 | #endif |
230 | |
253 | |
231 | tap = new tap_device (); |
254 | tap = new tap_device (); |
232 | if (!tap) //D this, of course, never catches |
255 | if (!tap) //D this, of course, never catches |
233 | { |
256 | { |
234 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
257 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
235 | exit (1); |
258 | exit (EXIT_FAILURE); |
236 | } |
259 | } |
237 | |
260 | |
238 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
261 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
239 | |
262 | |
240 | tap_ev_watcher.start (tap->fd, POLLIN); |
263 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
241 | |
264 | |
242 | reconnect_all (); |
265 | reconnect_all (); |
243 | |
266 | |
244 | return 0; |
267 | return 0; |
245 | } |
|
|
246 | |
|
|
247 | // send a vpn packet out to other hosts |
|
|
248 | bool |
|
|
249 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
250 | { |
|
|
251 | switch (si.prot) |
|
|
252 | { |
|
|
253 | case PROT_IPv4: |
|
|
254 | return send_ipv4_packet (pkt, si, tos); |
|
|
255 | |
|
|
256 | case PROT_UDPv4: |
|
|
257 | return send_udpv4_packet (pkt, si, tos); |
|
|
258 | |
|
|
259 | #if ENABLE_TCP |
|
|
260 | case PROT_TCPv4: |
|
|
261 | return send_tcpv4_packet (pkt, si, tos); |
|
|
262 | #endif |
|
|
263 | |
|
|
264 | #if ENABLE_ICMP |
|
|
265 | case PROT_ICMPv4: |
|
|
266 | return send_icmpv4_packet (pkt, si, tos); |
|
|
267 | #endif |
|
|
268 | |
|
|
269 | default: |
|
|
270 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
271 | return false; |
|
|
272 | } |
|
|
273 | } |
268 | } |
274 | |
269 | |
275 | bool |
270 | bool |
276 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
271 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
277 | { |
272 | { |
… | |
… | |
399 | } |
394 | } |
400 | |
395 | |
401 | void |
396 | void |
402 | vpn::ipv4_ev (io_watcher &w, short revents) |
397 | vpn::ipv4_ev (io_watcher &w, short revents) |
403 | { |
398 | { |
404 | if (revents & (POLLIN | POLLERR)) |
399 | if (revents & EVENT_READ) |
405 | { |
400 | { |
406 | vpn_packet *pkt = new vpn_packet; |
401 | vpn_packet *pkt = new vpn_packet; |
407 | struct sockaddr_in sa; |
402 | struct sockaddr_in sa; |
408 | socklen_t sa_len = sizeof (sa); |
403 | socklen_t sa_len = sizeof (sa); |
409 | int len; |
404 | int len; |
… | |
… | |
428 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
423 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
429 | } |
424 | } |
430 | |
425 | |
431 | delete pkt; |
426 | delete pkt; |
432 | } |
427 | } |
433 | else if (revents & POLLHUP) |
|
|
434 | { |
|
|
435 | // this cannot ;) happen on udp sockets |
|
|
436 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
|
437 | exit (1); |
|
|
438 | } |
|
|
439 | else |
428 | else |
440 | { |
429 | { |
441 | slog (L_ERR, |
430 | slog (L_ERR, |
442 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
431 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
443 | revents); |
432 | revents); |
444 | exit (1); |
433 | exit (EXIT_FAILURE); |
445 | } |
434 | } |
446 | } |
435 | } |
447 | |
436 | |
448 | #if ENABLE_ICMP |
437 | #if ENABLE_ICMP |
449 | void |
438 | void |
450 | vpn::icmpv4_ev (io_watcher &w, short revents) |
439 | vpn::icmpv4_ev (io_watcher &w, short revents) |
451 | { |
440 | { |
452 | if (revents & (POLLIN | POLLERR)) |
441 | if (revents & EVENT_READ) |
453 | { |
442 | { |
454 | vpn_packet *pkt = new vpn_packet; |
443 | vpn_packet *pkt = new vpn_packet; |
455 | struct sockaddr_in sa; |
444 | struct sockaddr_in sa; |
456 | socklen_t sa_len = sizeof (sa); |
445 | socklen_t sa_len = sizeof (sa); |
457 | int len; |
446 | int len; |
… | |
… | |
482 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
471 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
483 | } |
472 | } |
484 | |
473 | |
485 | delete pkt; |
474 | delete pkt; |
486 | } |
475 | } |
487 | else if (revents & POLLHUP) |
|
|
488 | { |
|
|
489 | // this cannot ;) happen on udp sockets |
|
|
490 | slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating.")); |
|
|
491 | exit (1); |
|
|
492 | } |
|
|
493 | else |
476 | else |
494 | { |
477 | { |
495 | slog (L_ERR, |
478 | slog (L_ERR, |
496 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
479 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
497 | revents); |
480 | revents); |
498 | exit (1); |
481 | exit (EXIT_FAILURE); |
499 | } |
482 | } |
500 | } |
483 | } |
501 | #endif |
484 | #endif |
502 | |
485 | |
503 | void |
486 | void |
504 | vpn::udpv4_ev (io_watcher &w, short revents) |
487 | vpn::udpv4_ev (io_watcher &w, short revents) |
505 | { |
488 | { |
506 | if (revents & (POLLIN | POLLERR)) |
489 | if (revents & EVENT_READ) |
507 | { |
490 | { |
508 | vpn_packet *pkt = new vpn_packet; |
491 | vpn_packet *pkt = new vpn_packet; |
509 | struct sockaddr_in sa; |
492 | struct sockaddr_in sa; |
510 | socklen_t sa_len = sizeof (sa); |
493 | socklen_t sa_len = sizeof (sa); |
511 | int len; |
494 | int len; |
… | |
… | |
526 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
509 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
527 | } |
510 | } |
528 | |
511 | |
529 | delete pkt; |
512 | delete pkt; |
530 | } |
513 | } |
531 | else if (revents & POLLHUP) |
|
|
532 | { |
|
|
533 | // this cannot ;) happen on udp sockets |
|
|
534 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
535 | exit (1); |
|
|
536 | } |
|
|
537 | else |
514 | else |
538 | { |
515 | { |
539 | slog (L_ERR, |
516 | slog (L_ERR, |
540 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
517 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
541 | revents); |
518 | revents); |
542 | exit (1); |
519 | exit (EXIT_FAILURE); |
543 | } |
520 | } |
544 | } |
521 | } |
545 | |
522 | |
546 | void |
523 | void |
547 | vpn::tap_ev (io_watcher &w, short revents) |
524 | vpn::tap_ev (io_watcher &w, short revents) |
548 | { |
525 | { |
549 | if (revents & POLLIN) |
526 | if (revents & EVENT_READ) |
550 | { |
527 | { |
551 | /* process data */ |
528 | /* process data */ |
552 | tap_packet *pkt; |
529 | tap_packet *pkt; |
553 | |
530 | |
554 | pkt = tap->recv (); |
531 | pkt = tap->recv (); |
… | |
… | |
562 | int src = mac2id (pkt->src); |
539 | int src = mac2id (pkt->src); |
563 | |
540 | |
564 | if (src != THISNODE->id) |
541 | if (src != THISNODE->id) |
565 | { |
542 | { |
566 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
543 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
567 | exit (1); |
544 | exit (EXIT_FAILURE); |
568 | } |
545 | } |
569 | |
546 | |
570 | if (dst == THISNODE->id) |
547 | if (dst == THISNODE->id) |
571 | { |
548 | { |
572 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
549 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
573 | exit (1); |
550 | exit (EXIT_FAILURE); |
574 | } |
551 | } |
575 | |
552 | |
576 | if (dst > conns.size ()) |
553 | if (dst > conns.size ()) |
577 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
554 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
578 | else |
555 | else |
579 | inject_data_packet (pkt, dst); |
556 | inject_data_packet (pkt, dst); |
580 | } |
557 | } |
581 | |
558 | |
582 | delete pkt; |
559 | delete pkt; |
583 | } |
560 | } |
584 | else if (revents & (POLLHUP | POLLERR)) |
|
|
585 | { |
|
|
586 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
587 | exit (1); |
|
|
588 | } |
|
|
589 | else |
561 | else |
590 | abort (); |
562 | abort (); |
591 | } |
563 | } |
592 | |
564 | |
593 | void |
565 | void |
… | |
… | |
598 | if (events & EVENT_SHUTDOWN) |
570 | if (events & EVENT_SHUTDOWN) |
599 | { |
571 | { |
600 | slog (L_INFO, _("preparing shutdown...")); |
572 | slog (L_INFO, _("preparing shutdown...")); |
601 | |
573 | |
602 | shutdown_all (); |
574 | shutdown_all (); |
603 | |
|
|
604 | remove_pid (pidfilename); |
575 | remove_pid (conf.pidfilename); |
605 | |
|
|
606 | slog (L_INFO, _("terminating")); |
576 | slog (L_INFO, _("terminating")); |
607 | |
577 | exit (EXIT_SUCCESS); |
608 | exit (0); |
|
|
609 | } |
578 | } |
610 | |
579 | |
611 | if (events & EVENT_RECONNECT) |
580 | if (events & EVENT_RECONNECT) |
612 | { |
581 | { |
613 | slog (L_INFO, _("forced reconnect")); |
582 | slog (L_INFO, _("forced reconnect")); |
… | |
… | |
615 | reconnect_all (); |
584 | reconnect_all (); |
616 | } |
585 | } |
617 | |
586 | |
618 | events = 0; |
587 | events = 0; |
619 | } |
588 | } |
620 | |
|
|
621 | w.at = TSTAMP_CANCEL; |
|
|
622 | } |
589 | } |
623 | |
590 | |
624 | void |
591 | void |
625 | vpn::shutdown_all () |
592 | vpn::shutdown_all () |
626 | { |
593 | { |
… | |
… | |
639 | connection_init (); |
606 | connection_init (); |
640 | |
607 | |
641 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
608 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
642 | i != conf.nodes.end (); ++i) |
609 | i != conf.nodes.end (); ++i) |
643 | { |
610 | { |
644 | connection *conn = new connection (this); |
611 | connection *conn = new connection (this, *i); |
645 | |
|
|
646 | conn->conf = *i; |
|
|
647 | conns.push_back (conn); |
612 | conns.push_back (conn); |
648 | |
|
|
649 | conn->establish_connection (); |
613 | conn->establish_connection (); |
650 | } |
614 | } |
651 | } |
615 | } |
652 | |
616 | |
653 | connection *vpn::find_router () |
617 | connection *vpn::find_router () |
… | |
… | |
716 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
680 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
717 | #endif |
681 | #endif |
718 | #if ENABLE_ICMP |
682 | #if ENABLE_ICMP |
719 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
683 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
720 | #endif |
684 | #endif |
|
|
685 | #if ENABLE_DNS |
|
|
686 | , dnsv4_ev_watcher (this, &vpn::dnsv4_ev) |
|
|
687 | #endif |
721 | , tap_ev_watcher (this, &vpn::tap_ev) |
688 | , tap_ev_watcher (this, &vpn::tap_ev) |
722 | { |
689 | { |
723 | } |
690 | } |
724 | |
691 | |
725 | vpn::~vpn () |
692 | vpn::~vpn () |