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); |
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|
58 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); |
60 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env); |
59 | putenv (env); |
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|
60 | asprintf (&env, "NODEID=%d", THISNODE->id); |
61 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
61 | putenv (env); |
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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); |
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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); |
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|
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); |
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222 | } |
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223 | |
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224 | tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ); |
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225 | } |
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226 | #endif |
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227 | |
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228 | #if ENABLE_DNS |
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229 | if (THISNODE->protocols & PROT_DNSv4) |
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230 | { |
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231 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
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232 | |
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233 | if (dnsv4_fd < 0) |
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234 | return -1; |
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235 | |
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236 | // standard daemon practise... |
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237 | { |
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238 | int oval = 1; |
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239 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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240 | } |
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241 | |
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242 | sockinfo si (THISNODE, PROT_DNSv4); |
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243 | |
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244 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
222 | } |
245 | { |
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246 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
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247 | exit (EXIT_FAILURE); |
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248 | } |
223 | |
249 | |
224 | tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
250 | dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ); |
225 | } |
251 | } |
226 | #endif |
252 | #endif |
227 | |
253 | |
228 | tap = new tap_device (); |
254 | tap = new tap_device (); |
229 | if (!tap) //D this, of course, never catches |
255 | if (!tap) //D this, of course, never catches |
230 | { |
256 | { |
231 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
257 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
232 | exit (1); |
258 | exit (EXIT_FAILURE); |
233 | } |
259 | } |
234 | |
260 | |
235 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
261 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
236 | |
262 | |
237 | tap_ev_watcher.start (tap->fd, POLLIN); |
263 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
238 | |
264 | |
239 | reconnect_all (); |
265 | reconnect_all (); |
240 | |
266 | |
241 | return 0; |
267 | return 0; |
242 | } |
268 | } |
… | |
… | |
259 | #endif |
285 | #endif |
260 | |
286 | |
261 | #if ENABLE_ICMP |
287 | #if ENABLE_ICMP |
262 | case PROT_ICMPv4: |
288 | case PROT_ICMPv4: |
263 | return send_icmpv4_packet (pkt, si, tos); |
289 | return send_icmpv4_packet (pkt, si, tos); |
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290 | #endif |
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291 | |
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292 | #if ENABLE_DNS |
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293 | case PROT_DNSv4: |
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294 | return send_dnsv4_packet (pkt, si, tos); |
264 | #endif |
295 | #endif |
265 | |
296 | |
266 | default: |
297 | default: |
267 | 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); |
268 | return false; |
299 | return false; |
… | |
… | |
396 | } |
427 | } |
397 | |
428 | |
398 | void |
429 | void |
399 | vpn::ipv4_ev (io_watcher &w, short revents) |
430 | vpn::ipv4_ev (io_watcher &w, short revents) |
400 | { |
431 | { |
401 | if (revents & (POLLIN | POLLERR)) |
432 | if (revents & EVENT_READ) |
402 | { |
433 | { |
403 | vpn_packet *pkt = new vpn_packet; |
434 | vpn_packet *pkt = new vpn_packet; |
404 | struct sockaddr_in sa; |
435 | struct sockaddr_in sa; |
405 | socklen_t sa_len = sizeof (sa); |
436 | socklen_t sa_len = sizeof (sa); |
406 | int len; |
437 | int len; |
… | |
… | |
425 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
456 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
426 | } |
457 | } |
427 | |
458 | |
428 | delete pkt; |
459 | delete pkt; |
429 | } |
460 | } |
430 | else if (revents & POLLHUP) |
|
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431 | { |
|
|
432 | // this cannot ;) happen on udp sockets |
|
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433 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
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434 | exit (1); |
|
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435 | } |
|
|
436 | else |
461 | else |
437 | { |
462 | { |
438 | slog (L_ERR, |
463 | slog (L_ERR, |
439 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
464 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
440 | revents); |
465 | revents); |
441 | exit (1); |
466 | exit (EXIT_FAILURE); |
442 | } |
467 | } |
443 | } |
468 | } |
444 | |
469 | |
445 | #if ENABLE_ICMP |
470 | #if ENABLE_ICMP |
446 | void |
471 | void |
447 | vpn::icmpv4_ev (io_watcher &w, short revents) |
472 | vpn::icmpv4_ev (io_watcher &w, short revents) |
448 | { |
473 | { |
449 | if (revents & (POLLIN | POLLERR)) |
474 | if (revents & EVENT_READ) |
450 | { |
475 | { |
451 | vpn_packet *pkt = new vpn_packet; |
476 | vpn_packet *pkt = new vpn_packet; |
452 | struct sockaddr_in sa; |
477 | struct sockaddr_in sa; |
453 | socklen_t sa_len = sizeof (sa); |
478 | socklen_t sa_len = sizeof (sa); |
454 | int len; |
479 | int len; |
… | |
… | |
479 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
504 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
480 | } |
505 | } |
481 | |
506 | |
482 | delete pkt; |
507 | delete pkt; |
483 | } |
508 | } |
484 | else if (revents & POLLHUP) |
|
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485 | { |
|
|
486 | // this cannot ;) happen on udp sockets |
|
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487 | slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating.")); |
|
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488 | exit (1); |
|
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489 | } |
|
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490 | else |
509 | else |
491 | { |
510 | { |
492 | slog (L_ERR, |
511 | slog (L_ERR, |
493 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
512 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
494 | revents); |
513 | revents); |
495 | exit (1); |
514 | exit (EXIT_FAILURE); |
496 | } |
515 | } |
497 | } |
516 | } |
498 | #endif |
517 | #endif |
499 | |
518 | |
500 | void |
519 | void |
501 | vpn::udpv4_ev (io_watcher &w, short revents) |
520 | vpn::udpv4_ev (io_watcher &w, short revents) |
502 | { |
521 | { |
503 | if (revents & (POLLIN | POLLERR)) |
522 | if (revents & EVENT_READ) |
504 | { |
523 | { |
505 | vpn_packet *pkt = new vpn_packet; |
524 | vpn_packet *pkt = new vpn_packet; |
506 | struct sockaddr_in sa; |
525 | struct sockaddr_in sa; |
507 | socklen_t sa_len = sizeof (sa); |
526 | socklen_t sa_len = sizeof (sa); |
508 | int len; |
527 | int len; |
… | |
… | |
523 | 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)); |
524 | } |
543 | } |
525 | |
544 | |
526 | delete pkt; |
545 | delete pkt; |
527 | } |
546 | } |
528 | else if (revents & POLLHUP) |
|
|
529 | { |
|
|
530 | // this cannot ;) happen on udp sockets |
|
|
531 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
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532 | exit (1); |
|
|
533 | } |
|
|
534 | else |
547 | else |
535 | { |
548 | { |
536 | slog (L_ERR, |
549 | slog (L_ERR, |
537 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
550 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
538 | revents); |
551 | revents); |
539 | exit (1); |
552 | exit (EXIT_FAILURE); |
540 | } |
553 | } |
541 | } |
554 | } |
542 | |
555 | |
543 | void |
556 | void |
544 | vpn::tap_ev (io_watcher &w, short revents) |
557 | vpn::tap_ev (io_watcher &w, short revents) |
545 | { |
558 | { |
546 | if (revents & POLLIN) |
559 | if (revents & EVENT_READ) |
547 | { |
560 | { |
548 | /* process data */ |
561 | /* process data */ |
549 | tap_packet *pkt; |
562 | tap_packet *pkt; |
550 | |
563 | |
551 | pkt = tap->recv (); |
564 | pkt = tap->recv (); |
… | |
… | |
559 | int src = mac2id (pkt->src); |
572 | int src = mac2id (pkt->src); |
560 | |
573 | |
561 | if (src != THISNODE->id) |
574 | if (src != THISNODE->id) |
562 | { |
575 | { |
563 | 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.")); |
564 | exit (1); |
577 | exit (EXIT_FAILURE); |
565 | } |
578 | } |
566 | |
579 | |
567 | if (dst == THISNODE->id) |
580 | if (dst == THISNODE->id) |
568 | { |
581 | { |
569 | 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.")); |
570 | exit (1); |
583 | exit (EXIT_FAILURE); |
571 | } |
584 | } |
572 | |
585 | |
573 | if (dst > conns.size ()) |
586 | if (dst > conns.size ()) |
574 | 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); |
575 | else |
588 | else |
576 | inject_data_packet (pkt, dst); |
589 | inject_data_packet (pkt, dst); |
577 | } |
590 | } |
578 | |
591 | |
579 | delete pkt; |
592 | delete pkt; |
580 | } |
593 | } |
581 | else if (revents & (POLLHUP | POLLERR)) |
|
|
582 | { |
|
|
583 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
584 | exit (1); |
|
|
585 | } |
|
|
586 | else |
594 | else |
587 | abort (); |
595 | abort (); |
588 | } |
596 | } |
589 | |
597 | |
590 | void |
598 | void |
… | |
… | |
595 | if (events & EVENT_SHUTDOWN) |
603 | if (events & EVENT_SHUTDOWN) |
596 | { |
604 | { |
597 | slog (L_INFO, _("preparing shutdown...")); |
605 | slog (L_INFO, _("preparing shutdown...")); |
598 | |
606 | |
599 | shutdown_all (); |
607 | shutdown_all (); |
600 | |
|
|
601 | remove_pid (pidfilename); |
608 | remove_pid (conf.pidfilename); |
602 | |
|
|
603 | slog (L_INFO, _("terminating")); |
609 | slog (L_INFO, _("terminating")); |
604 | |
610 | exit (EXIT_SUCCESS); |
605 | exit (0); |
|
|
606 | } |
611 | } |
607 | |
612 | |
608 | if (events & EVENT_RECONNECT) |
613 | if (events & EVENT_RECONNECT) |
609 | { |
614 | { |
610 | slog (L_INFO, _("forced reconnect")); |
615 | slog (L_INFO, _("forced reconnect")); |
… | |
… | |
612 | reconnect_all (); |
617 | reconnect_all (); |
613 | } |
618 | } |
614 | |
619 | |
615 | events = 0; |
620 | events = 0; |
616 | } |
621 | } |
617 | |
|
|
618 | w.at = TSTAMP_CANCEL; |
|
|
619 | } |
622 | } |
620 | |
623 | |
621 | void |
624 | void |
622 | vpn::shutdown_all () |
625 | vpn::shutdown_all () |
623 | { |
626 | { |
… | |
… | |
713 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
716 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
714 | #endif |
717 | #endif |
715 | #if ENABLE_ICMP |
718 | #if ENABLE_ICMP |
716 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
719 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
717 | #endif |
720 | #endif |
|
|
721 | #if ENABLE_DNS |
|
|
722 | , dnsv4_ev_watcher (this, &vpn::dnsv4_ev) |
|
|
723 | #endif |
718 | , tap_ev_watcher (this, &vpn::tap_ev) |
724 | , tap_ev_watcher (this, &vpn::tap_ev) |
719 | { |
725 | { |
720 | } |
726 | } |
721 | |
727 | |
722 | vpn::~vpn () |
728 | vpn::~vpn () |