1 | /* |
1 | /* |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
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3 | Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com> |
3 | |
4 | |
4 | 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 |
5 | 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 |
6 | the Free Software Foundation; either version 2 of the License, or |
7 | the Free Software Foundation; either version 2 of the License, or |
7 | (at your option) any later version. |
8 | (at your option) any later version. |
… | |
… | |
18 | |
19 | |
19 | #include "config.h" |
20 | #include "config.h" |
20 | |
21 | |
21 | #include <list> |
22 | #include <list> |
22 | |
23 | |
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24 | #include <cstdio> |
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25 | #include <cstring> |
23 | #include <cstdlib> |
26 | #include <cstdlib> |
24 | #include <cstring> |
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25 | #include <cstdio> |
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26 | |
27 | |
27 | #include <sys/types.h> |
28 | #include <sys/types.h> |
28 | #include <sys/socket.h> |
29 | #include <sys/socket.h> |
29 | #include <sys/wait.h> |
30 | #include <sys/wait.h> |
30 | #include <errno.h> |
31 | #include <errno.h> |
… | |
… | |
39 | |
40 | |
40 | #include "connection.h" |
41 | #include "connection.h" |
41 | #include "util.h" |
42 | #include "util.h" |
42 | #include "vpn.h" |
43 | #include "vpn.h" |
43 | |
44 | |
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45 | vpn network; // THE vpn (bad design...) |
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46 | |
44 | ///////////////////////////////////////////////////////////////////////////// |
47 | ///////////////////////////////////////////////////////////////////////////// |
45 | |
48 | |
46 | const char *vpn::script_if_up () |
49 | const char *vpn::script_if_up () |
47 | { |
50 | { |
48 | // the tunnel device mtu should be the physical mtu - overhead |
51 | // the tunnel device mtu should be the physical mtu - overhead |
… | |
… | |
51 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
54 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
52 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
55 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
53 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
56 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
54 | |
57 | |
55 | char *env; |
58 | char *env; |
56 | asprintf (&env, "CONFBASE=%s", confbase); |
59 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
57 | putenv (env); |
|
|
58 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); |
60 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env); |
59 | putenv (env); |
|
|
60 | asprintf (&env, "NODEID=%d", THISNODE->id); |
61 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
61 | putenv (env); |
|
|
62 | asprintf (&env, "IFNAME=%s", tap->interface ()); |
62 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
63 | putenv (env); |
63 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
|
|
64 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
64 | asprintf (&env, "MTU=%d", mtu); |
65 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
65 | putenv (env); |
|
|
66 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
66 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
67 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
67 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
68 | THISNODE->id & 0xff); |
68 | THISNODE->id & 0xff); |
69 | putenv (env); |
69 | putenv (env); |
70 | |
70 | |
… | |
… | |
98 | sockinfo si (THISNODE, PROT_IPv4); |
98 | sockinfo si (THISNODE, PROT_IPv4); |
99 | |
99 | |
100 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
100 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
101 | { |
101 | { |
102 | 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)); |
103 | exit (1); |
103 | exit (EXIT_FAILURE); |
104 | } |
104 | } |
105 | |
105 | |
106 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
106 | ipv4_ev_watcher.start (ipv4_fd, EVENT_READ); |
107 | } |
107 | } |
108 | |
108 | |
109 | udpv4_fd = -1; |
109 | udpv4_fd = -1; |
110 | |
110 | |
111 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
111 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
… | |
… | |
136 | sockinfo si (THISNODE, PROT_UDPv4); |
136 | sockinfo si (THISNODE, PROT_UDPv4); |
137 | |
137 | |
138 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
138 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
139 | { |
139 | { |
140 | 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)); |
141 | exit (1); |
141 | exit (EXIT_FAILURE); |
142 | } |
142 | } |
143 | |
143 | |
144 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
144 | udpv4_ev_watcher.start (udpv4_fd, EVENT_READ); |
145 | } |
145 | } |
146 | |
146 | |
147 | icmpv4_fd = -1; |
147 | icmpv4_fd = -1; |
148 | |
148 | |
149 | #if ENABLE_ICMP |
149 | #if ENABLE_ICMP |
… | |
… | |
180 | sockinfo si (THISNODE, PROT_ICMPv4); |
180 | sockinfo si (THISNODE, PROT_ICMPv4); |
181 | |
181 | |
182 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
182 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
183 | { |
183 | { |
184 | 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)); |
185 | exit (1); |
185 | exit (EXIT_FAILURE); |
186 | } |
186 | } |
187 | |
187 | |
188 | icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); |
188 | icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ); |
189 | } |
189 | } |
190 | #endif |
190 | #endif |
191 | |
191 | |
192 | tcpv4_fd = -1; |
192 | tcpv4_fd = -1; |
193 | |
193 | |
… | |
… | |
210 | sockinfo si (THISNODE, PROT_TCPv4); |
210 | sockinfo si (THISNODE, PROT_TCPv4); |
211 | |
211 | |
212 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
212 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
213 | { |
213 | { |
214 | 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)); |
215 | exit (1); |
215 | exit (EXIT_FAILURE); |
216 | } |
216 | } |
217 | |
217 | |
218 | if (listen (tcpv4_fd, 5)) |
218 | if (listen (tcpv4_fd, 5)) |
219 | { |
219 | { |
220 | 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)); |
221 | exit (1); |
221 | exit (EXIT_FAILURE); |
222 | } |
222 | } |
223 | |
223 | |
224 | tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
224 | tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ); |
225 | } |
225 | } |
226 | #endif |
226 | #endif |
227 | |
227 | |
228 | tap = new tap_device (); |
228 | tap = new tap_device (); |
229 | if (!tap) //D this, of course, never catches |
229 | if (!tap) //D this, of course, never catches |
230 | { |
230 | { |
231 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
231 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
232 | exit (1); |
232 | exit (EXIT_FAILURE); |
233 | } |
233 | } |
234 | |
234 | |
235 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
235 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
236 | |
236 | |
237 | tap_ev_watcher.start (tap->fd, POLLIN); |
237 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
238 | |
238 | |
239 | reconnect_all (); |
239 | reconnect_all (); |
240 | |
240 | |
241 | return 0; |
241 | return 0; |
242 | } |
242 | } |
… | |
… | |
332 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
332 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
333 | #endif |
333 | #endif |
334 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
334 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
335 | |
335 | |
336 | return true; |
336 | return true; |
|
|
337 | } |
|
|
338 | |
|
|
339 | void |
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340 | vpn::inject_data_packet (tap_packet *pkt, int dst) |
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341 | { |
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342 | if (dst) |
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343 | { |
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344 | // unicast |
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345 | if (dst != THISNODE->id) |
|
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346 | conns[dst - 1]->inject_data_packet (pkt); |
|
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347 | } |
|
|
348 | else |
|
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349 | { |
|
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350 | // broadcast, this is ugly, but due to the security policy |
|
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351 | // we have to connect to all hosts... |
|
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352 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
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353 | if ((*c)->conf != THISNODE) |
|
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354 | (*c)->inject_data_packet (pkt, true); |
|
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355 | } |
337 | } |
356 | } |
338 | |
357 | |
339 | void |
358 | void |
340 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
359 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
341 | { |
360 | { |
… | |
… | |
358 | connection *c = conns[src - 1]; |
377 | connection *c = conns[src - 1]; |
359 | |
378 | |
360 | if (dst == 0) |
379 | if (dst == 0) |
361 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
380 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
362 | c->conf->nodename, (const char *)rsi); |
381 | c->conf->nodename, (const char *)rsi); |
363 | else if (dst != 0 && dst != THISNODE->id) |
382 | else if (dst != THISNODE->id) |
364 | { |
383 | { |
365 | if (THISNODE->routerprio) |
384 | if (THISNODE->routerprio) |
366 | // the tos setting gets lost here. who cares. |
385 | // the tos setting gets lost here. who cares. |
367 | conns[dst - 1]->inject_vpn_packet (pkt); |
386 | conns[dst - 1]->inject_vpn_packet (pkt); |
368 | else |
387 | else |
… | |
… | |
377 | } |
396 | } |
378 | |
397 | |
379 | void |
398 | void |
380 | vpn::ipv4_ev (io_watcher &w, short revents) |
399 | vpn::ipv4_ev (io_watcher &w, short revents) |
381 | { |
400 | { |
382 | if (revents & (POLLIN | POLLERR)) |
401 | if (revents & EVENT_READ) |
383 | { |
402 | { |
384 | vpn_packet *pkt = new vpn_packet; |
403 | vpn_packet *pkt = new vpn_packet; |
385 | struct sockaddr_in sa; |
404 | struct sockaddr_in sa; |
386 | socklen_t sa_len = sizeof (sa); |
405 | socklen_t sa_len = sizeof (sa); |
387 | int len; |
406 | int len; |
… | |
… | |
406 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
425 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
407 | } |
426 | } |
408 | |
427 | |
409 | delete pkt; |
428 | delete pkt; |
410 | } |
429 | } |
411 | else if (revents & POLLHUP) |
|
|
412 | { |
|
|
413 | // this cannot ;) happen on udp sockets |
|
|
414 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
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415 | exit (1); |
|
|
416 | } |
|
|
417 | else |
430 | else |
418 | { |
431 | { |
419 | slog (L_ERR, |
432 | slog (L_ERR, |
420 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
433 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
421 | revents); |
434 | revents); |
422 | exit (1); |
435 | exit (EXIT_FAILURE); |
423 | } |
436 | } |
424 | } |
437 | } |
425 | |
438 | |
426 | #if ENABLE_ICMP |
439 | #if ENABLE_ICMP |
427 | void |
440 | void |
428 | vpn::icmpv4_ev (io_watcher &w, short revents) |
441 | vpn::icmpv4_ev (io_watcher &w, short revents) |
429 | { |
442 | { |
430 | if (revents & (POLLIN | POLLERR)) |
443 | if (revents & EVENT_READ) |
431 | { |
444 | { |
432 | vpn_packet *pkt = new vpn_packet; |
445 | vpn_packet *pkt = new vpn_packet; |
433 | struct sockaddr_in sa; |
446 | struct sockaddr_in sa; |
434 | socklen_t sa_len = sizeof (sa); |
447 | socklen_t sa_len = sizeof (sa); |
435 | int len; |
448 | int len; |
… | |
… | |
460 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
473 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
461 | } |
474 | } |
462 | |
475 | |
463 | delete pkt; |
476 | delete pkt; |
464 | } |
477 | } |
465 | else if (revents & POLLHUP) |
|
|
466 | { |
|
|
467 | // this cannot ;) happen on udp sockets |
|
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468 | slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating.")); |
|
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469 | exit (1); |
|
|
470 | } |
|
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471 | else |
478 | else |
472 | { |
479 | { |
473 | slog (L_ERR, |
480 | slog (L_ERR, |
474 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
481 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
475 | revents); |
482 | revents); |
476 | exit (1); |
483 | exit (EXIT_FAILURE); |
477 | } |
484 | } |
478 | } |
485 | } |
479 | #endif |
486 | #endif |
480 | |
487 | |
481 | void |
488 | void |
482 | vpn::udpv4_ev (io_watcher &w, short revents) |
489 | vpn::udpv4_ev (io_watcher &w, short revents) |
483 | { |
490 | { |
484 | if (revents & (POLLIN | POLLERR)) |
491 | if (revents & EVENT_READ) |
485 | { |
492 | { |
486 | vpn_packet *pkt = new vpn_packet; |
493 | vpn_packet *pkt = new vpn_packet; |
487 | struct sockaddr_in sa; |
494 | struct sockaddr_in sa; |
488 | socklen_t sa_len = sizeof (sa); |
495 | socklen_t sa_len = sizeof (sa); |
489 | int len; |
496 | int len; |
… | |
… | |
504 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
511 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
505 | } |
512 | } |
506 | |
513 | |
507 | delete pkt; |
514 | delete pkt; |
508 | } |
515 | } |
509 | else if (revents & POLLHUP) |
|
|
510 | { |
|
|
511 | // this cannot ;) happen on udp sockets |
|
|
512 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
513 | exit (1); |
|
|
514 | } |
|
|
515 | else |
516 | else |
516 | { |
517 | { |
517 | slog (L_ERR, |
518 | slog (L_ERR, |
518 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
519 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
519 | revents); |
520 | revents); |
520 | exit (1); |
521 | exit (EXIT_FAILURE); |
521 | } |
522 | } |
522 | } |
523 | } |
523 | |
524 | |
524 | void |
525 | void |
525 | vpn::tap_ev (io_watcher &w, short revents) |
526 | vpn::tap_ev (io_watcher &w, short revents) |
526 | { |
527 | { |
527 | if (revents & POLLIN) |
528 | if (revents & EVENT_READ) |
528 | { |
529 | { |
529 | /* process data */ |
530 | /* process data */ |
530 | tap_packet *pkt; |
531 | tap_packet *pkt; |
531 | |
532 | |
532 | pkt = tap->recv (); |
533 | pkt = tap->recv (); |
… | |
… | |
540 | int src = mac2id (pkt->src); |
541 | int src = mac2id (pkt->src); |
541 | |
542 | |
542 | if (src != THISNODE->id) |
543 | if (src != THISNODE->id) |
543 | { |
544 | { |
544 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
545 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
545 | exit (1); |
546 | exit (EXIT_FAILURE); |
546 | } |
547 | } |
547 | |
548 | |
548 | if (dst == THISNODE->id) |
549 | if (dst == THISNODE->id) |
549 | { |
550 | { |
550 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
551 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
551 | exit (1); |
552 | exit (EXIT_FAILURE); |
552 | } |
553 | } |
553 | |
554 | |
554 | if (dst > conns.size ()) |
555 | if (dst > conns.size ()) |
555 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
556 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
556 | else |
557 | else |
557 | { |
|
|
558 | if (dst) |
|
|
559 | { |
|
|
560 | // unicast |
|
|
561 | if (dst != THISNODE->id) |
|
|
562 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
563 | } |
|
|
564 | else |
|
|
565 | { |
|
|
566 | // broadcast, this is ugly, but due to the security policy |
|
|
567 | // we have to connect to all hosts... |
|
|
568 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
569 | if ((*c)->conf != THISNODE) |
|
|
570 | (*c)->inject_data_packet (pkt); |
558 | inject_data_packet (pkt, dst); |
571 | } |
|
|
572 | } |
|
|
573 | } |
559 | } |
574 | |
560 | |
575 | delete pkt; |
561 | delete pkt; |
576 | } |
|
|
577 | else if (revents & (POLLHUP | POLLERR)) |
|
|
578 | { |
|
|
579 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
580 | exit (1); |
|
|
581 | } |
562 | } |
582 | else |
563 | else |
583 | abort (); |
564 | abort (); |
584 | } |
565 | } |
585 | |
566 | |
… | |
… | |
591 | if (events & EVENT_SHUTDOWN) |
572 | if (events & EVENT_SHUTDOWN) |
592 | { |
573 | { |
593 | slog (L_INFO, _("preparing shutdown...")); |
574 | slog (L_INFO, _("preparing shutdown...")); |
594 | |
575 | |
595 | shutdown_all (); |
576 | shutdown_all (); |
596 | |
|
|
597 | remove_pid (pidfilename); |
577 | remove_pid (pidfilename); |
598 | |
|
|
599 | slog (L_INFO, _("terminating")); |
578 | slog (L_INFO, _("terminating")); |
600 | |
579 | exit (EXIT_SUCCESS); |
601 | exit (0); |
|
|
602 | } |
580 | } |
603 | |
581 | |
604 | if (events & EVENT_RECONNECT) |
582 | if (events & EVENT_RECONNECT) |
605 | { |
583 | { |
606 | slog (L_INFO, _("forced reconnect")); |
584 | slog (L_INFO, _("forced reconnect")); |
… | |
… | |
608 | reconnect_all (); |
586 | reconnect_all (); |
609 | } |
587 | } |
610 | |
588 | |
611 | events = 0; |
589 | events = 0; |
612 | } |
590 | } |
613 | |
|
|
614 | w.at = TSTAMP_CANCEL; |
|
|
615 | } |
591 | } |
616 | |
592 | |
617 | void |
593 | void |
618 | vpn::shutdown_all () |
594 | vpn::shutdown_all () |
619 | { |
595 | { |