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> |
… | |
… | |
40 | |
40 | |
41 | #include "connection.h" |
41 | #include "connection.h" |
42 | #include "util.h" |
42 | #include "util.h" |
43 | #include "vpn.h" |
43 | #include "vpn.h" |
44 | |
44 | |
|
|
45 | vpn network; // THE vpn (bad design...) |
|
|
46 | |
45 | ///////////////////////////////////////////////////////////////////////////// |
47 | ///////////////////////////////////////////////////////////////////////////// |
46 | |
48 | |
47 | const char *vpn::script_if_up () |
49 | const char *vpn::script_if_up () |
48 | { |
50 | { |
49 | // the tunnel device mtu should be the physical mtu - overhead |
51 | // the tunnel device mtu should be the physical mtu - overhead |
… | |
… | |
52 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
54 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
53 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
55 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
54 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
56 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
55 | |
57 | |
56 | char *env; |
58 | char *env; |
57 | asprintf (&env, "CONFBASE=%s", confbase); |
59 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
58 | putenv (env); |
|
|
59 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); |
60 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env); |
60 | putenv (env); |
|
|
61 | asprintf (&env, "NODEID=%d", THISNODE->id); |
61 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
62 | putenv (env); |
|
|
63 | asprintf (&env, "IFNAME=%s", tap->interface ()); |
62 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
64 | putenv (env); |
63 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
|
|
64 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
65 | asprintf (&env, "MTU=%d", mtu); |
65 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
66 | putenv (env); |
|
|
67 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
66 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
68 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
67 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
69 | THISNODE->id & 0xff); |
68 | THISNODE->id & 0xff); |
70 | putenv (env); |
69 | putenv (env); |
71 | |
70 | |
… | |
… | |
99 | sockinfo si (THISNODE, PROT_IPv4); |
98 | sockinfo si (THISNODE, PROT_IPv4); |
100 | |
99 | |
101 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
100 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
102 | { |
101 | { |
103 | 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)); |
104 | exit (1); |
103 | exit (EXIT_FAILURE); |
105 | } |
104 | } |
106 | |
105 | |
107 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
106 | ipv4_ev_watcher.start (ipv4_fd, EVENT_READ); |
108 | } |
107 | } |
109 | |
108 | |
110 | udpv4_fd = -1; |
109 | udpv4_fd = -1; |
111 | |
110 | |
112 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
111 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
… | |
… | |
137 | sockinfo si (THISNODE, PROT_UDPv4); |
136 | sockinfo si (THISNODE, PROT_UDPv4); |
138 | |
137 | |
139 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
138 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
140 | { |
139 | { |
141 | 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)); |
142 | exit (1); |
141 | exit (EXIT_FAILURE); |
143 | } |
142 | } |
144 | |
143 | |
145 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
144 | udpv4_ev_watcher.start (udpv4_fd, EVENT_READ); |
146 | } |
145 | } |
147 | |
146 | |
148 | icmpv4_fd = -1; |
147 | icmpv4_fd = -1; |
149 | |
148 | |
150 | #if ENABLE_ICMP |
149 | #if ENABLE_ICMP |
… | |
… | |
181 | sockinfo si (THISNODE, PROT_ICMPv4); |
180 | sockinfo si (THISNODE, PROT_ICMPv4); |
182 | |
181 | |
183 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
182 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
184 | { |
183 | { |
185 | 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)); |
186 | exit (1); |
185 | exit (EXIT_FAILURE); |
187 | } |
186 | } |
188 | |
187 | |
189 | icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); |
188 | icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ); |
190 | } |
189 | } |
191 | #endif |
190 | #endif |
192 | |
191 | |
193 | tcpv4_fd = -1; |
192 | tcpv4_fd = -1; |
194 | |
193 | |
… | |
… | |
211 | sockinfo si (THISNODE, PROT_TCPv4); |
210 | sockinfo si (THISNODE, PROT_TCPv4); |
212 | |
211 | |
213 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
212 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
214 | { |
213 | { |
215 | 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)); |
216 | exit (1); |
215 | exit (EXIT_FAILURE); |
217 | } |
216 | } |
218 | |
217 | |
219 | if (listen (tcpv4_fd, 5)) |
218 | if (listen (tcpv4_fd, 5)) |
220 | { |
219 | { |
221 | 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)); |
222 | 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 ())) |
223 | } |
245 | { |
|
|
246 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
|
|
247 | exit (EXIT_FAILURE); |
|
|
248 | } |
224 | |
249 | |
225 | tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
250 | dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ); |
226 | } |
251 | } |
227 | #endif |
252 | #endif |
228 | |
253 | |
229 | tap = new tap_device (); |
254 | tap = new tap_device (); |
230 | if (!tap) //D this, of course, never catches |
255 | if (!tap) //D this, of course, never catches |
231 | { |
256 | { |
232 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
257 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
233 | exit (1); |
258 | exit (EXIT_FAILURE); |
234 | } |
259 | } |
235 | |
260 | |
236 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
261 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
237 | |
262 | |
238 | tap_ev_watcher.start (tap->fd, POLLIN); |
263 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
239 | |
264 | |
240 | reconnect_all (); |
265 | reconnect_all (); |
241 | |
266 | |
242 | return 0; |
267 | return 0; |
243 | } |
268 | } |
… | |
… | |
260 | #endif |
285 | #endif |
261 | |
286 | |
262 | #if ENABLE_ICMP |
287 | #if ENABLE_ICMP |
263 | case PROT_ICMPv4: |
288 | case PROT_ICMPv4: |
264 | return send_icmpv4_packet (pkt, si, tos); |
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); |
265 | #endif |
295 | #endif |
266 | |
296 | |
267 | default: |
297 | default: |
268 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
298 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
269 | return false; |
299 | return false; |
… | |
… | |
397 | } |
427 | } |
398 | |
428 | |
399 | void |
429 | void |
400 | vpn::ipv4_ev (io_watcher &w, short revents) |
430 | vpn::ipv4_ev (io_watcher &w, short revents) |
401 | { |
431 | { |
402 | if (revents & (POLLIN | POLLERR)) |
432 | if (revents & EVENT_READ) |
403 | { |
433 | { |
404 | vpn_packet *pkt = new vpn_packet; |
434 | vpn_packet *pkt = new vpn_packet; |
405 | struct sockaddr_in sa; |
435 | struct sockaddr_in sa; |
406 | socklen_t sa_len = sizeof (sa); |
436 | socklen_t sa_len = sizeof (sa); |
407 | int len; |
437 | int len; |
… | |
… | |
426 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
456 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
427 | } |
457 | } |
428 | |
458 | |
429 | delete pkt; |
459 | delete pkt; |
430 | } |
460 | } |
431 | else if (revents & POLLHUP) |
|
|
432 | { |
|
|
433 | // this cannot ;) happen on udp sockets |
|
|
434 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
|
435 | exit (1); |
|
|
436 | } |
|
|
437 | else |
461 | else |
438 | { |
462 | { |
439 | slog (L_ERR, |
463 | slog (L_ERR, |
440 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
464 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
441 | revents); |
465 | revents); |
442 | exit (1); |
466 | exit (EXIT_FAILURE); |
443 | } |
467 | } |
444 | } |
468 | } |
445 | |
469 | |
446 | #if ENABLE_ICMP |
470 | #if ENABLE_ICMP |
447 | void |
471 | void |
448 | vpn::icmpv4_ev (io_watcher &w, short revents) |
472 | vpn::icmpv4_ev (io_watcher &w, short revents) |
449 | { |
473 | { |
450 | if (revents & (POLLIN | POLLERR)) |
474 | if (revents & EVENT_READ) |
451 | { |
475 | { |
452 | vpn_packet *pkt = new vpn_packet; |
476 | vpn_packet *pkt = new vpn_packet; |
453 | struct sockaddr_in sa; |
477 | struct sockaddr_in sa; |
454 | socklen_t sa_len = sizeof (sa); |
478 | socklen_t sa_len = sizeof (sa); |
455 | int len; |
479 | int len; |
… | |
… | |
480 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
504 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
481 | } |
505 | } |
482 | |
506 | |
483 | delete pkt; |
507 | delete pkt; |
484 | } |
508 | } |
485 | else if (revents & POLLHUP) |
|
|
486 | { |
|
|
487 | // this cannot ;) happen on udp sockets |
|
|
488 | slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating.")); |
|
|
489 | exit (1); |
|
|
490 | } |
|
|
491 | else |
509 | else |
492 | { |
510 | { |
493 | slog (L_ERR, |
511 | slog (L_ERR, |
494 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
512 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
495 | revents); |
513 | revents); |
496 | exit (1); |
514 | exit (EXIT_FAILURE); |
497 | } |
515 | } |
498 | } |
516 | } |
499 | #endif |
517 | #endif |
500 | |
518 | |
501 | void |
519 | void |
502 | vpn::udpv4_ev (io_watcher &w, short revents) |
520 | vpn::udpv4_ev (io_watcher &w, short revents) |
503 | { |
521 | { |
504 | if (revents & (POLLIN | POLLERR)) |
522 | if (revents & EVENT_READ) |
505 | { |
523 | { |
506 | vpn_packet *pkt = new vpn_packet; |
524 | vpn_packet *pkt = new vpn_packet; |
507 | struct sockaddr_in sa; |
525 | struct sockaddr_in sa; |
508 | socklen_t sa_len = sizeof (sa); |
526 | socklen_t sa_len = sizeof (sa); |
509 | int len; |
527 | int len; |
… | |
… | |
524 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
542 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
525 | } |
543 | } |
526 | |
544 | |
527 | delete pkt; |
545 | delete pkt; |
528 | } |
546 | } |
529 | else if (revents & POLLHUP) |
|
|
530 | { |
|
|
531 | // this cannot ;) happen on udp sockets |
|
|
532 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
533 | exit (1); |
|
|
534 | } |
|
|
535 | else |
547 | else |
536 | { |
548 | { |
537 | slog (L_ERR, |
549 | slog (L_ERR, |
538 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
550 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
539 | revents); |
551 | revents); |
540 | exit (1); |
552 | exit (EXIT_FAILURE); |
541 | } |
553 | } |
542 | } |
554 | } |
543 | |
555 | |
544 | void |
556 | void |
545 | vpn::tap_ev (io_watcher &w, short revents) |
557 | vpn::tap_ev (io_watcher &w, short revents) |
546 | { |
558 | { |
547 | if (revents & POLLIN) |
559 | if (revents & EVENT_READ) |
548 | { |
560 | { |
549 | /* process data */ |
561 | /* process data */ |
550 | tap_packet *pkt; |
562 | tap_packet *pkt; |
551 | |
563 | |
552 | pkt = tap->recv (); |
564 | pkt = tap->recv (); |
… | |
… | |
560 | int src = mac2id (pkt->src); |
572 | int src = mac2id (pkt->src); |
561 | |
573 | |
562 | if (src != THISNODE->id) |
574 | if (src != THISNODE->id) |
563 | { |
575 | { |
564 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
576 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
565 | exit (1); |
577 | exit (EXIT_FAILURE); |
566 | } |
578 | } |
567 | |
579 | |
568 | if (dst == THISNODE->id) |
580 | if (dst == THISNODE->id) |
569 | { |
581 | { |
570 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
582 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
571 | exit (1); |
583 | exit (EXIT_FAILURE); |
572 | } |
584 | } |
573 | |
585 | |
574 | if (dst > conns.size ()) |
586 | if (dst > conns.size ()) |
575 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
587 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
576 | else |
588 | else |
577 | inject_data_packet (pkt, dst); |
589 | inject_data_packet (pkt, dst); |
578 | } |
590 | } |
579 | |
591 | |
580 | delete pkt; |
592 | delete pkt; |
581 | } |
593 | } |
582 | else if (revents & (POLLHUP | POLLERR)) |
|
|
583 | { |
|
|
584 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
585 | exit (1); |
|
|
586 | } |
|
|
587 | else |
594 | else |
588 | abort (); |
595 | abort (); |
589 | } |
596 | } |
590 | |
597 | |
591 | void |
598 | void |
… | |
… | |
596 | if (events & EVENT_SHUTDOWN) |
603 | if (events & EVENT_SHUTDOWN) |
597 | { |
604 | { |
598 | slog (L_INFO, _("preparing shutdown...")); |
605 | slog (L_INFO, _("preparing shutdown...")); |
599 | |
606 | |
600 | shutdown_all (); |
607 | shutdown_all (); |
601 | |
|
|
602 | remove_pid (pidfilename); |
608 | remove_pid (conf.pidfilename); |
603 | |
|
|
604 | slog (L_INFO, _("terminating")); |
609 | slog (L_INFO, _("terminating")); |
605 | |
610 | exit (EXIT_SUCCESS); |
606 | exit (0); |
|
|
607 | } |
611 | } |
608 | |
612 | |
609 | if (events & EVENT_RECONNECT) |
613 | if (events & EVENT_RECONNECT) |
610 | { |
614 | { |
611 | slog (L_INFO, _("forced reconnect")); |
615 | slog (L_INFO, _("forced reconnect")); |
… | |
… | |
613 | reconnect_all (); |
617 | reconnect_all (); |
614 | } |
618 | } |
615 | |
619 | |
616 | events = 0; |
620 | events = 0; |
617 | } |
621 | } |
618 | |
|
|
619 | w.at = TSTAMP_CANCEL; |
|
|
620 | } |
622 | } |
621 | |
623 | |
622 | void |
624 | void |
623 | vpn::shutdown_all () |
625 | vpn::shutdown_all () |
624 | { |
626 | { |
… | |
… | |
714 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
716 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
715 | #endif |
717 | #endif |
716 | #if ENABLE_ICMP |
718 | #if ENABLE_ICMP |
717 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
719 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
718 | #endif |
720 | #endif |
|
|
721 | #if ENABLE_DNS |
|
|
722 | , dnsv4_ev_watcher (this, &vpn::dnsv4_ev) |
|
|
723 | #endif |
719 | , tap_ev_watcher (this, &vpn::tap_ev) |
724 | , tap_ev_watcher (this, &vpn::tap_ev) |
720 | { |
725 | { |
721 | } |
726 | } |
722 | |
727 | |
723 | vpn::~vpn () |
728 | vpn::~vpn () |