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 | |
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5 | This file is part of GVPE. |
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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 | |
… | |
… | |
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 |
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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); |
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70 | |
72 | |
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73 | // TODO: info for other nodes, maybe? |
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74 | } |
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75 | |
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76 | const char *vpn::script_if_init () |
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77 | { |
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78 | script_init_env (); |
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79 | |
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80 | return tap->if_up (); |
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81 | } |
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82 | |
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83 | const char *vpn::script_if_up () |
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84 | { |
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85 | script_init_env (); |
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86 | |
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87 | char *filename; |
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88 | asprintf (&filename, |
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89 | "%s/%s", |
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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"); |
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92 | |
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93 | return filename; |
72 | } |
94 | } |
73 | |
95 | |
74 | int |
96 | int |
75 | vpn::setup () |
97 | vpn::setup () |
76 | { |
98 | { |
… | |
… | |
226 | #endif |
248 | #endif |
227 | |
249 | |
228 | #if ENABLE_DNS |
250 | #if ENABLE_DNS |
229 | if (THISNODE->protocols & PROT_DNSv4) |
251 | if (THISNODE->protocols & PROT_DNSv4) |
230 | { |
252 | { |
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253 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
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254 | |
231 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
255 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
232 | |
256 | |
233 | if (dnsv4_fd < 0) |
257 | if (dnsv4_fd < 0) |
234 | return -1; |
258 | return -1; |
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259 | |
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260 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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261 | // this I really consider a linux bug. I am neither connected |
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262 | // nor do I fragment myself. Linux still sets DF and doesn't |
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263 | // fragment for me sometimes. |
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264 | { |
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265 | int oval = IP_PMTUDISC_DONT; |
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266 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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267 | } |
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268 | #endif |
235 | |
269 | |
236 | // standard daemon practise... |
270 | // standard daemon practise... |
237 | { |
271 | { |
238 | int oval = 1; |
272 | int oval = 1; |
239 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
273 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
240 | } |
274 | } |
241 | |
275 | |
242 | sockinfo si (THISNODE, PROT_DNSv4); |
276 | sockinfo si (THISNODE->dns_hostname, |
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277 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
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278 | PROT_DNSv4); |
243 | |
279 | |
244 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
280 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
245 | { |
281 | { |
246 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
282 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
247 | exit (EXIT_FAILURE); |
283 | exit (EXIT_FAILURE); |
… | |
… | |
256 | { |
292 | { |
257 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
293 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
258 | exit (EXIT_FAILURE); |
294 | exit (EXIT_FAILURE); |
259 | } |
295 | } |
260 | |
296 | |
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297 | if (tap->if_up () && |
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298 | !run_script (run_script_cb (this, &vpn::script_if_init), true)) |
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299 | { |
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300 | slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
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301 | tap->if_up ()); |
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302 | exit (EXIT_FAILURE); |
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303 | } |
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304 | |
261 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
305 | if (!run_script (run_script_cb (this, &vpn::script_if_up), true)) |
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306 | { |
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307 | slog (L_ERR, _("if-up command execution failed, exiting.")); |
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308 | exit (EXIT_FAILURE); |
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309 | } |
262 | |
310 | |
263 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
311 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
264 | |
312 | |
265 | reconnect_all (); |
313 | reconnect_all (); |
266 | |
314 | |
267 | return 0; |
315 | return 0; |
268 | } |
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269 | |
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270 | // send a vpn packet out to other hosts |
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271 | bool |
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272 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
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273 | { |
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274 | switch (si.prot) |
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275 | { |
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276 | case PROT_IPv4: |
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277 | return send_ipv4_packet (pkt, si, tos); |
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278 | |
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279 | case PROT_UDPv4: |
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280 | return send_udpv4_packet (pkt, si, tos); |
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281 | |
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282 | #if ENABLE_TCP |
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283 | case PROT_TCPv4: |
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284 | return send_tcpv4_packet (pkt, si, tos); |
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285 | #endif |
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286 | |
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287 | #if ENABLE_ICMP |
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288 | case PROT_ICMPv4: |
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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); |
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295 | #endif |
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296 | |
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297 | default: |
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298 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
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299 | return false; |
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300 | } |
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301 | } |
316 | } |
302 | |
317 | |
303 | bool |
318 | bool |
304 | 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) |
305 | { |
320 | { |
… | |
… | |
424 | else |
439 | else |
425 | c->recv_vpn_packet (pkt, rsi); |
440 | c->recv_vpn_packet (pkt, rsi); |
426 | } |
441 | } |
427 | } |
442 | } |
428 | |
443 | |
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444 | bool |
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445 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
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446 | { |
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447 | switch (si.prot) |
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448 | { |
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449 | case PROT_IPv4: |
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450 | return send_ipv4_packet (pkt, si, tos); |
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451 | case PROT_UDPv4: |
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452 | return send_udpv4_packet (pkt, si, tos); |
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453 | #if ENABLE_TCP |
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454 | case PROT_TCPv4: |
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455 | return send_tcpv4_packet (pkt, si, tos); |
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456 | #endif |
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457 | #if ENABLE_ICMP |
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458 | case PROT_ICMPv4: |
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459 | return send_icmpv4_packet (pkt, si, tos); |
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460 | #endif |
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461 | #if ENABLE_DNS |
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462 | case PROT_DNSv4: |
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463 | return send_dnsv4_packet (pkt, si, tos); |
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464 | #endif |
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465 | |
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466 | default: |
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467 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
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468 | } |
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469 | |
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470 | return false; |
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471 | } |
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472 | |
429 | void |
473 | void |
430 | vpn::ipv4_ev (io_watcher &w, short revents) |
474 | vpn::ipv4_ev (io_watcher &w, short revents) |
431 | { |
475 | { |
432 | if (revents & EVENT_READ) |
476 | if (revents & EVENT_READ) |
433 | { |
477 | { |
… | |
… | |
442 | |
486 | |
443 | if (len > 0) |
487 | if (len > 0) |
444 | { |
488 | { |
445 | pkt->len = len; |
489 | pkt->len = len; |
446 | |
490 | |
447 | // 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 |
448 | // this is slow, but... |
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449 | pkt->skip_hdr (IP_OVERHEAD); |
492 | pkt->skip_hdr (IP_OVERHEAD); |
450 | |
493 | |
451 | recv_vpn_packet (pkt, si); |
494 | recv_vpn_packet (pkt, si); |
452 | } |
495 | } |
453 | else |
496 | else |
… | |
… | |
459 | delete pkt; |
502 | delete pkt; |
460 | } |
503 | } |
461 | else |
504 | else |
462 | { |
505 | { |
463 | slog (L_ERR, |
506 | slog (L_ERR, |
464 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
507 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
465 | revents); |
508 | revents); |
466 | exit (EXIT_FAILURE); |
509 | exit (EXIT_FAILURE); |
467 | } |
510 | } |
468 | } |
511 | } |
469 | |
512 | |
470 | #if ENABLE_ICMP |
513 | #if ENABLE_ICMP |
… | |
… | |
571 | int dst = mac2id (pkt->dst); |
614 | int dst = mac2id (pkt->dst); |
572 | int src = mac2id (pkt->src); |
615 | int src = mac2id (pkt->src); |
573 | |
616 | |
574 | if (src != THISNODE->id) |
617 | if (src != THISNODE->id) |
575 | { |
618 | { |
576 | 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.")); |
577 | exit (EXIT_FAILURE); |
620 | exit (EXIT_FAILURE); |
578 | } |
621 | } |
579 | |
622 | |
580 | if (dst == THISNODE->id) |
623 | if (dst == THISNODE->id) |
581 | { |
624 | { |
… | |
… | |
639 | connection_init (); |
682 | connection_init (); |
640 | |
683 | |
641 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
684 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
642 | i != conf.nodes.end (); ++i) |
685 | i != conf.nodes.end (); ++i) |
643 | { |
686 | { |
644 | connection *conn = new connection (this); |
687 | connection *conn = new connection (this, *i); |
645 | |
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646 | conn->conf = *i; |
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647 | conns.push_back (conn); |
688 | conns.push_back (conn); |
648 | |
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649 | conn->establish_connection (); |
689 | conn->establish_connection (); |
650 | } |
690 | } |
651 | } |
691 | } |
652 | |
692 | |
653 | connection *vpn::find_router () |
693 | connection *vpn::find_router () |