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); |
225 | } |
222 | } |
226 | |
223 | |
227 | tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
224 | tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ); |
228 | } |
225 | } |
229 | #endif |
226 | #endif |
230 | |
227 | |
231 | tap = new tap_device (); |
228 | tap = new tap_device (); |
232 | if (!tap) //D this, of course, never catches |
229 | if (!tap) //D this, of course, never catches |
233 | { |
230 | { |
234 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
231 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
235 | exit (1); |
232 | exit (EXIT_FAILURE); |
236 | } |
233 | } |
237 | |
234 | |
238 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
235 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
239 | |
236 | |
240 | tap_ev_watcher.start (tap->fd, POLLIN); |
237 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
241 | |
238 | |
242 | reconnect_all (); |
239 | reconnect_all (); |
243 | |
240 | |
244 | return 0; |
241 | return 0; |
245 | } |
242 | } |
… | |
… | |
399 | } |
396 | } |
400 | |
397 | |
401 | void |
398 | void |
402 | vpn::ipv4_ev (io_watcher &w, short revents) |
399 | vpn::ipv4_ev (io_watcher &w, short revents) |
403 | { |
400 | { |
404 | if (revents & (POLLIN | POLLERR)) |
401 | if (revents & EVENT_READ) |
405 | { |
402 | { |
406 | vpn_packet *pkt = new vpn_packet; |
403 | vpn_packet *pkt = new vpn_packet; |
407 | struct sockaddr_in sa; |
404 | struct sockaddr_in sa; |
408 | socklen_t sa_len = sizeof (sa); |
405 | socklen_t sa_len = sizeof (sa); |
409 | int len; |
406 | int len; |
… | |
… | |
428 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
425 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
429 | } |
426 | } |
430 | |
427 | |
431 | delete pkt; |
428 | delete pkt; |
432 | } |
429 | } |
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 |
430 | else |
440 | { |
431 | { |
441 | slog (L_ERR, |
432 | slog (L_ERR, |
442 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
433 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
443 | revents); |
434 | revents); |
444 | exit (1); |
435 | exit (EXIT_FAILURE); |
445 | } |
436 | } |
446 | } |
437 | } |
447 | |
438 | |
448 | #if ENABLE_ICMP |
439 | #if ENABLE_ICMP |
449 | void |
440 | void |
450 | vpn::icmpv4_ev (io_watcher &w, short revents) |
441 | vpn::icmpv4_ev (io_watcher &w, short revents) |
451 | { |
442 | { |
452 | if (revents & (POLLIN | POLLERR)) |
443 | if (revents & EVENT_READ) |
453 | { |
444 | { |
454 | vpn_packet *pkt = new vpn_packet; |
445 | vpn_packet *pkt = new vpn_packet; |
455 | struct sockaddr_in sa; |
446 | struct sockaddr_in sa; |
456 | socklen_t sa_len = sizeof (sa); |
447 | socklen_t sa_len = sizeof (sa); |
457 | int len; |
448 | int len; |
… | |
… | |
482 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
473 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
483 | } |
474 | } |
484 | |
475 | |
485 | delete pkt; |
476 | delete pkt; |
486 | } |
477 | } |
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 |
478 | else |
494 | { |
479 | { |
495 | slog (L_ERR, |
480 | slog (L_ERR, |
496 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
481 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
497 | revents); |
482 | revents); |
498 | exit (1); |
483 | exit (EXIT_FAILURE); |
499 | } |
484 | } |
500 | } |
485 | } |
501 | #endif |
486 | #endif |
502 | |
487 | |
503 | void |
488 | void |
504 | vpn::udpv4_ev (io_watcher &w, short revents) |
489 | vpn::udpv4_ev (io_watcher &w, short revents) |
505 | { |
490 | { |
506 | if (revents & (POLLIN | POLLERR)) |
491 | if (revents & EVENT_READ) |
507 | { |
492 | { |
508 | vpn_packet *pkt = new vpn_packet; |
493 | vpn_packet *pkt = new vpn_packet; |
509 | struct sockaddr_in sa; |
494 | struct sockaddr_in sa; |
510 | socklen_t sa_len = sizeof (sa); |
495 | socklen_t sa_len = sizeof (sa); |
511 | int len; |
496 | int len; |
… | |
… | |
526 | 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)); |
527 | } |
512 | } |
528 | |
513 | |
529 | delete pkt; |
514 | delete pkt; |
530 | } |
515 | } |
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 |
516 | else |
538 | { |
517 | { |
539 | slog (L_ERR, |
518 | slog (L_ERR, |
540 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
519 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
541 | revents); |
520 | revents); |
542 | exit (1); |
521 | exit (EXIT_FAILURE); |
543 | } |
522 | } |
544 | } |
523 | } |
545 | |
524 | |
546 | void |
525 | void |
547 | vpn::tap_ev (io_watcher &w, short revents) |
526 | vpn::tap_ev (io_watcher &w, short revents) |
548 | { |
527 | { |
549 | if (revents & POLLIN) |
528 | if (revents & EVENT_READ) |
550 | { |
529 | { |
551 | /* process data */ |
530 | /* process data */ |
552 | tap_packet *pkt; |
531 | tap_packet *pkt; |
553 | |
532 | |
554 | pkt = tap->recv (); |
533 | pkt = tap->recv (); |
… | |
… | |
562 | int src = mac2id (pkt->src); |
541 | int src = mac2id (pkt->src); |
563 | |
542 | |
564 | if (src != THISNODE->id) |
543 | if (src != THISNODE->id) |
565 | { |
544 | { |
566 | 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.")); |
567 | exit (1); |
546 | exit (EXIT_FAILURE); |
568 | } |
547 | } |
569 | |
548 | |
570 | if (dst == THISNODE->id) |
549 | if (dst == THISNODE->id) |
571 | { |
550 | { |
572 | 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.")); |
573 | exit (1); |
552 | exit (EXIT_FAILURE); |
574 | } |
553 | } |
575 | |
554 | |
576 | if (dst > conns.size ()) |
555 | if (dst > conns.size ()) |
577 | 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); |
578 | else |
557 | else |
579 | inject_data_packet (pkt, dst); |
558 | inject_data_packet (pkt, dst); |
580 | } |
559 | } |
581 | |
560 | |
582 | delete pkt; |
561 | delete pkt; |
583 | } |
562 | } |
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 |
563 | else |
590 | abort (); |
564 | abort (); |
591 | } |
565 | } |
592 | |
566 | |
593 | void |
567 | void |
… | |
… | |
598 | if (events & EVENT_SHUTDOWN) |
572 | if (events & EVENT_SHUTDOWN) |
599 | { |
573 | { |
600 | slog (L_INFO, _("preparing shutdown...")); |
574 | slog (L_INFO, _("preparing shutdown...")); |
601 | |
575 | |
602 | shutdown_all (); |
576 | shutdown_all (); |
603 | |
|
|
604 | remove_pid (pidfilename); |
577 | remove_pid (pidfilename); |
605 | |
|
|
606 | slog (L_INFO, _("terminating")); |
578 | slog (L_INFO, _("terminating")); |
607 | |
579 | exit (EXIT_SUCCESS); |
608 | exit (0); |
|
|
609 | } |
580 | } |
610 | |
581 | |
611 | if (events & EVENT_RECONNECT) |
582 | if (events & EVENT_RECONNECT) |
612 | { |
583 | { |
613 | slog (L_INFO, _("forced reconnect")); |
584 | slog (L_INFO, _("forced reconnect")); |
… | |
… | |
615 | reconnect_all (); |
586 | reconnect_all (); |
616 | } |
587 | } |
617 | |
588 | |
618 | events = 0; |
589 | events = 0; |
619 | } |
590 | } |
620 | |
|
|
621 | w.at = TSTAMP_CANCEL; |
|
|
622 | } |
591 | } |
623 | |
592 | |
624 | void |
593 | void |
625 | vpn::shutdown_all () |
594 | vpn::shutdown_all () |
626 | { |
595 | { |