1 | /* |
1 | /* |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
3 | Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com> |
3 | Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> |
4 | |
4 | |
|
|
5 | This file is part of GVPE. |
|
|
6 | |
5 | This program is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify |
6 | 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 |
7 | the Free Software Foundation; either version 2 of the License, or |
9 | the Free Software Foundation; either version 2 of the License, or |
8 | (at your option) any later version. |
10 | (at your option) any later version. |
9 | |
11 | |
10 | This program is distributed in the hope that it will be useful, |
12 | This program is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | GNU General Public License for more details. |
15 | GNU General Public License for more details. |
14 | |
16 | |
15 | 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 |
16 | along with this program; if not, write to the Free Software |
18 | along with gvpe; if not, write to the Free Software |
17 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
18 | */ |
20 | */ |
19 | |
21 | |
20 | #include "config.h" |
22 | #include "config.h" |
21 | |
23 | |
22 | #include <list> |
24 | #include <list> |
23 | |
25 | |
|
|
26 | #include <cstdio> |
|
|
27 | #include <cstring> |
24 | #include <cstdlib> |
28 | #include <cstdlib> |
25 | #include <cstring> |
|
|
26 | #include <cstdio> |
|
|
27 | |
29 | |
28 | #include <sys/types.h> |
30 | #include <sys/types.h> |
29 | #include <sys/socket.h> |
31 | #include <sys/socket.h> |
30 | #include <sys/wait.h> |
32 | #include <sys/wait.h> |
31 | #include <errno.h> |
33 | #include <errno.h> |
… | |
… | |
44 | |
46 | |
45 | vpn network; // THE vpn (bad design...) |
47 | vpn network; // THE vpn (bad design...) |
46 | |
48 | |
47 | ///////////////////////////////////////////////////////////////////////////// |
49 | ///////////////////////////////////////////////////////////////////////////// |
48 | |
50 | |
49 | const char *vpn::script_if_up () |
51 | void |
|
|
52 | vpn::script_init_env () |
50 | { |
53 | { |
51 | // the tunnel device mtu should be the physical mtu - overhead |
54 | // the tunnel device mtu should be the physical mtu - overhead |
52 | // the tricky part is rounding to the cipher key blocksize |
55 | // the tricky part is rounding to the cipher key blocksize |
53 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
56 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
54 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
57 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
… | |
… | |
63 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
66 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
64 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
67 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
65 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
68 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
66 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
69 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
67 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
70 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
68 | THISNODE->id & 0xff); |
71 | THISNODE->id & 0xff); putenv (env); |
69 | putenv (env); |
|
|
70 | |
72 | |
|
|
73 | // TODO: info for other nodes, maybe? |
|
|
74 | } |
|
|
75 | |
|
|
76 | const char *vpn::script_if_init () |
|
|
77 | { |
|
|
78 | script_init_env (); |
|
|
79 | |
|
|
80 | return tap->if_up (); |
|
|
81 | } |
|
|
82 | |
|
|
83 | const char *vpn::script_if_up () |
|
|
84 | { |
|
|
85 | script_init_env (); |
|
|
86 | |
|
|
87 | char *filename; |
|
|
88 | asprintf (&filename, |
|
|
89 | "%s/%s", |
|
|
90 | confbase, |
71 | return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; |
91 | ::conf.script_if_up ? ::conf.script_if_up : "if-up"); |
|
|
92 | |
|
|
93 | return filename; |
72 | } |
94 | } |
73 | |
95 | |
74 | int |
96 | int |
75 | vpn::setup () |
97 | vpn::setup () |
76 | { |
98 | { |
… | |
… | |
98 | sockinfo si (THISNODE, PROT_IPv4); |
120 | sockinfo si (THISNODE, PROT_IPv4); |
99 | |
121 | |
100 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
122 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
101 | { |
123 | { |
102 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
124 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
103 | exit (1); |
125 | exit (EXIT_FAILURE); |
104 | } |
126 | } |
105 | |
127 | |
106 | ipv4_ev_watcher.start (ipv4_fd, EVENT_READ); |
128 | ipv4_ev_watcher.start (ipv4_fd, EVENT_READ); |
107 | } |
129 | } |
108 | |
130 | |
… | |
… | |
136 | sockinfo si (THISNODE, PROT_UDPv4); |
158 | sockinfo si (THISNODE, PROT_UDPv4); |
137 | |
159 | |
138 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
160 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
139 | { |
161 | { |
140 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
162 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
141 | exit (1); |
163 | exit (EXIT_FAILURE); |
142 | } |
164 | } |
143 | |
165 | |
144 | udpv4_ev_watcher.start (udpv4_fd, EVENT_READ); |
166 | udpv4_ev_watcher.start (udpv4_fd, EVENT_READ); |
145 | } |
167 | } |
146 | |
168 | |
… | |
… | |
180 | sockinfo si (THISNODE, PROT_ICMPv4); |
202 | sockinfo si (THISNODE, PROT_ICMPv4); |
181 | |
203 | |
182 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
204 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
183 | { |
205 | { |
184 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
206 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
185 | exit (1); |
207 | exit (EXIT_FAILURE); |
186 | } |
208 | } |
187 | |
209 | |
188 | icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ); |
210 | icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ); |
189 | } |
211 | } |
190 | #endif |
212 | #endif |
… | |
… | |
210 | sockinfo si (THISNODE, PROT_TCPv4); |
232 | sockinfo si (THISNODE, PROT_TCPv4); |
211 | |
233 | |
212 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
234 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
213 | { |
235 | { |
214 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
236 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
215 | exit (1); |
237 | exit (EXIT_FAILURE); |
216 | } |
238 | } |
217 | |
239 | |
218 | if (listen (tcpv4_fd, 5)) |
240 | if (listen (tcpv4_fd, 5)) |
219 | { |
241 | { |
220 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
242 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
221 | exit (1); |
243 | exit (EXIT_FAILURE); |
222 | } |
244 | } |
223 | |
245 | |
224 | tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ); |
246 | tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ); |
|
|
247 | } |
|
|
248 | #endif |
|
|
249 | |
|
|
250 | #if ENABLE_DNS |
|
|
251 | if (THISNODE->protocols & PROT_DNSv4) |
|
|
252 | { |
|
|
253 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
|
|
254 | |
|
|
255 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
|
|
256 | |
|
|
257 | if (dnsv4_fd < 0) |
|
|
258 | return -1; |
|
|
259 | |
|
|
260 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
|
|
261 | // this I really consider a linux bug. I am neither connected |
|
|
262 | // nor do I fragment myself. Linux still sets DF and doesn't |
|
|
263 | // fragment for me sometimes. |
|
|
264 | { |
|
|
265 | int oval = IP_PMTUDISC_DONT; |
|
|
266 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
|
|
267 | } |
|
|
268 | #endif |
|
|
269 | |
|
|
270 | // standard daemon practise... |
|
|
271 | { |
|
|
272 | int oval = 1; |
|
|
273 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
|
|
274 | } |
|
|
275 | |
|
|
276 | sockinfo si (THISNODE->dns_hostname, |
|
|
277 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
|
|
278 | PROT_DNSv4); |
|
|
279 | |
|
|
280 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
|
|
281 | { |
|
|
282 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
|
|
283 | exit (EXIT_FAILURE); |
|
|
284 | } |
|
|
285 | |
|
|
286 | dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ); |
225 | } |
287 | } |
226 | #endif |
288 | #endif |
227 | |
289 | |
228 | tap = new tap_device (); |
290 | tap = new tap_device (); |
229 | if (!tap) //D this, of course, never catches |
291 | if (!tap) //D this, of course, never catches |
230 | { |
292 | { |
231 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
293 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
232 | exit (1); |
294 | exit (EXIT_FAILURE); |
233 | } |
295 | } |
234 | |
296 | |
|
|
297 | if (tap->if_up () && |
|
|
298 | !run_script (run_script_cb (this, &vpn::script_if_init), true)) |
|
|
299 | { |
|
|
300 | slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
|
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301 | tap->if_up ()); |
|
|
302 | exit (EXIT_FAILURE); |
|
|
303 | } |
|
|
304 | |
235 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
305 | if (!run_script (run_script_cb (this, &vpn::script_if_up), true)) |
|
|
306 | { |
|
|
307 | slog (L_ERR, _("if-up command execution failed, exiting.")); |
|
|
308 | exit (EXIT_FAILURE); |
|
|
309 | } |
236 | |
310 | |
237 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
311 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
238 | |
312 | |
239 | reconnect_all (); |
313 | reconnect_all (); |
240 | |
314 | |
241 | return 0; |
315 | return 0; |
242 | } |
|
|
243 | |
|
|
244 | // send a vpn packet out to other hosts |
|
|
245 | bool |
|
|
246 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
247 | { |
|
|
248 | switch (si.prot) |
|
|
249 | { |
|
|
250 | case PROT_IPv4: |
|
|
251 | return send_ipv4_packet (pkt, si, tos); |
|
|
252 | |
|
|
253 | case PROT_UDPv4: |
|
|
254 | return send_udpv4_packet (pkt, si, tos); |
|
|
255 | |
|
|
256 | #if ENABLE_TCP |
|
|
257 | case PROT_TCPv4: |
|
|
258 | return send_tcpv4_packet (pkt, si, tos); |
|
|
259 | #endif |
|
|
260 | |
|
|
261 | #if ENABLE_ICMP |
|
|
262 | case PROT_ICMPv4: |
|
|
263 | return send_icmpv4_packet (pkt, si, tos); |
|
|
264 | #endif |
|
|
265 | |
|
|
266 | default: |
|
|
267 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
268 | return false; |
|
|
269 | } |
|
|
270 | } |
316 | } |
271 | |
317 | |
272 | bool |
318 | bool |
273 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
319 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
274 | { |
320 | { |
… | |
… | |
393 | else |
439 | else |
394 | c->recv_vpn_packet (pkt, rsi); |
440 | c->recv_vpn_packet (pkt, rsi); |
395 | } |
441 | } |
396 | } |
442 | } |
397 | |
443 | |
|
|
444 | bool |
|
|
445 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
446 | { |
|
|
447 | switch (si.prot) |
|
|
448 | { |
|
|
449 | case PROT_IPv4: |
|
|
450 | return send_ipv4_packet (pkt, si, tos); |
|
|
451 | case PROT_UDPv4: |
|
|
452 | return send_udpv4_packet (pkt, si, tos); |
|
|
453 | #if ENABLE_TCP |
|
|
454 | case PROT_TCPv4: |
|
|
455 | return send_tcpv4_packet (pkt, si, tos); |
|
|
456 | #endif |
|
|
457 | #if ENABLE_ICMP |
|
|
458 | case PROT_ICMPv4: |
|
|
459 | return send_icmpv4_packet (pkt, si, tos); |
|
|
460 | #endif |
|
|
461 | #if ENABLE_DNS |
|
|
462 | case PROT_DNSv4: |
|
|
463 | return send_dnsv4_packet (pkt, si, tos); |
|
|
464 | #endif |
|
|
465 | |
|
|
466 | default: |
|
|
467 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
468 | } |
|
|
469 | |
|
|
470 | return false; |
|
|
471 | } |
|
|
472 | |
398 | void |
473 | void |
399 | vpn::ipv4_ev (io_watcher &w, short revents) |
474 | vpn::ipv4_ev (io_watcher &w, short revents) |
400 | { |
475 | { |
401 | if (revents & EVENT_READ) |
476 | if (revents & EVENT_READ) |
402 | { |
477 | { |
… | |
… | |
411 | |
486 | |
412 | if (len > 0) |
487 | if (len > 0) |
413 | { |
488 | { |
414 | pkt->len = len; |
489 | pkt->len = len; |
415 | |
490 | |
416 | // raw sockets deliver the ipv4, but don't expect it on sends |
491 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
417 | // this is slow, but... |
|
|
418 | pkt->skip_hdr (IP_OVERHEAD); |
492 | pkt->skip_hdr (IP_OVERHEAD); |
419 | |
493 | |
420 | recv_vpn_packet (pkt, si); |
494 | recv_vpn_packet (pkt, si); |
421 | } |
495 | } |
422 | else |
496 | else |
… | |
… | |
428 | delete pkt; |
502 | delete pkt; |
429 | } |
503 | } |
430 | else |
504 | else |
431 | { |
505 | { |
432 | slog (L_ERR, |
506 | slog (L_ERR, |
433 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
507 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
434 | revents); |
508 | revents); |
435 | exit (1); |
509 | exit (EXIT_FAILURE); |
436 | } |
510 | } |
437 | } |
511 | } |
438 | |
512 | |
439 | #if ENABLE_ICMP |
513 | #if ENABLE_ICMP |
440 | void |
514 | void |
… | |
… | |
478 | else |
552 | else |
479 | { |
553 | { |
480 | slog (L_ERR, |
554 | slog (L_ERR, |
481 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
555 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
482 | revents); |
556 | revents); |
483 | exit (1); |
557 | exit (EXIT_FAILURE); |
484 | } |
558 | } |
485 | } |
559 | } |
486 | #endif |
560 | #endif |
487 | |
561 | |
488 | void |
562 | void |
… | |
… | |
516 | else |
590 | else |
517 | { |
591 | { |
518 | slog (L_ERR, |
592 | slog (L_ERR, |
519 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
593 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
520 | revents); |
594 | revents); |
521 | exit (1); |
595 | exit (EXIT_FAILURE); |
522 | } |
596 | } |
523 | } |
597 | } |
524 | |
598 | |
525 | void |
599 | void |
526 | vpn::tap_ev (io_watcher &w, short revents) |
600 | vpn::tap_ev (io_watcher &w, short revents) |
… | |
… | |
540 | int dst = mac2id (pkt->dst); |
614 | int dst = mac2id (pkt->dst); |
541 | int src = mac2id (pkt->src); |
615 | int src = mac2id (pkt->src); |
542 | |
616 | |
543 | if (src != THISNODE->id) |
617 | if (src != THISNODE->id) |
544 | { |
618 | { |
545 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
619 | slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
546 | exit (1); |
620 | exit (EXIT_FAILURE); |
547 | } |
621 | } |
548 | |
622 | |
549 | if (dst == THISNODE->id) |
623 | if (dst == THISNODE->id) |
550 | { |
624 | { |
551 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
625 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
552 | exit (1); |
626 | exit (EXIT_FAILURE); |
553 | } |
627 | } |
554 | |
628 | |
555 | if (dst > conns.size ()) |
629 | if (dst > conns.size ()) |
556 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
630 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
557 | else |
631 | else |
… | |
… | |
572 | if (events & EVENT_SHUTDOWN) |
646 | if (events & EVENT_SHUTDOWN) |
573 | { |
647 | { |
574 | slog (L_INFO, _("preparing shutdown...")); |
648 | slog (L_INFO, _("preparing shutdown...")); |
575 | |
649 | |
576 | shutdown_all (); |
650 | shutdown_all (); |
577 | remove_pid (pidfilename); |
651 | remove_pid (conf.pidfilename); |
578 | slog (L_INFO, _("terminating")); |
652 | slog (L_INFO, _("terminating")); |
579 | exit (0); |
653 | exit (EXIT_SUCCESS); |
580 | } |
654 | } |
581 | |
655 | |
582 | if (events & EVENT_RECONNECT) |
656 | if (events & EVENT_RECONNECT) |
583 | { |
657 | { |
584 | slog (L_INFO, _("forced reconnect")); |
658 | slog (L_INFO, _("forced reconnect")); |
… | |
… | |
608 | connection_init (); |
682 | connection_init (); |
609 | |
683 | |
610 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
684 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
611 | i != conf.nodes.end (); ++i) |
685 | i != conf.nodes.end (); ++i) |
612 | { |
686 | { |
613 | connection *conn = new connection (this); |
687 | connection *conn = new connection (this, *i); |
614 | |
|
|
615 | conn->conf = *i; |
|
|
616 | conns.push_back (conn); |
688 | conns.push_back (conn); |
617 | |
|
|
618 | conn->establish_connection (); |
689 | conn->establish_connection (); |
619 | } |
690 | } |
620 | } |
691 | } |
621 | |
692 | |
622 | connection *vpn::find_router () |
693 | connection *vpn::find_router () |
… | |
… | |
685 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
756 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
686 | #endif |
757 | #endif |
687 | #if ENABLE_ICMP |
758 | #if ENABLE_ICMP |
688 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
759 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
689 | #endif |
760 | #endif |
|
|
761 | #if ENABLE_DNS |
|
|
762 | , dnsv4_ev_watcher (this, &vpn::dnsv4_ev) |
|
|
763 | #endif |
690 | , tap_ev_watcher (this, &vpn::tap_ev) |
764 | , tap_ev_watcher (this, &vpn::tap_ev) |
691 | { |
765 | { |
692 | } |
766 | } |
693 | |
767 | |
694 | vpn::~vpn () |
768 | vpn::~vpn () |