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 |
55 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
58 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
56 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
59 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
57 | |
60 | |
58 | char *env; |
61 | char *env; |
59 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
62 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
60 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env); |
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61 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
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62 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
63 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
63 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
64 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
64 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
65 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
65 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
66 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
66 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
67 | asprintf (&env, "NODES=%d", conns.size ()); putenv (env); |
67 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
68 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
68 | THISNODE->id & 0xff); |
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69 | putenv (env); |
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70 | |
69 | |
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70 | conns [THISNODE->id - 1]->script_init_env (""); |
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71 | |
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72 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
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73 | { |
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74 | char ext[16]; |
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75 | snprintf (ext, 16, "_%d", (*c)->conf->id); |
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76 | (*c)->script_init_env (ext); |
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77 | } |
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78 | } |
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79 | |
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80 | const char *vpn::script_if_init () |
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81 | { |
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82 | script_init_env (); |
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83 | |
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84 | return tap->if_up (); |
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85 | } |
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86 | |
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87 | const char *vpn::script_if_up () |
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88 | { |
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89 | script_init_env (); |
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90 | |
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91 | char *filename; |
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92 | asprintf (&filename, |
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93 | "%s/%s", |
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94 | confbase, |
71 | return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; |
95 | ::conf.script_if_up ? ::conf.script_if_up : "if-up"); |
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96 | |
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97 | return filename; |
72 | } |
98 | } |
73 | |
99 | |
74 | int |
100 | int |
75 | vpn::setup () |
101 | vpn::setup () |
76 | { |
102 | { |
… | |
… | |
226 | #endif |
252 | #endif |
227 | |
253 | |
228 | #if ENABLE_DNS |
254 | #if ENABLE_DNS |
229 | if (THISNODE->protocols & PROT_DNSv4) |
255 | if (THISNODE->protocols & PROT_DNSv4) |
230 | { |
256 | { |
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257 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
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258 | |
231 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
259 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
232 | |
260 | |
233 | if (dnsv4_fd < 0) |
261 | if (dnsv4_fd < 0) |
234 | return -1; |
262 | return -1; |
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263 | |
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264 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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265 | // this I really consider a linux bug. I am neither connected |
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266 | // nor do I fragment myself. Linux still sets DF and doesn't |
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267 | // fragment for me sometimes. |
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268 | { |
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269 | int oval = IP_PMTUDISC_DONT; |
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270 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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271 | } |
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272 | #endif |
235 | |
273 | |
236 | // standard daemon practise... |
274 | // standard daemon practise... |
237 | { |
275 | { |
238 | int oval = 1; |
276 | int oval = 1; |
239 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
277 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
240 | } |
278 | } |
241 | |
279 | |
242 | sockinfo si (THISNODE, PROT_DNSv4); |
280 | sockinfo si (THISNODE->dns_hostname, |
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281 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
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282 | PROT_DNSv4); |
243 | |
283 | |
244 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
284 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
245 | { |
285 | { |
246 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
286 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
247 | exit (EXIT_FAILURE); |
287 | exit (EXIT_FAILURE); |
… | |
… | |
249 | |
289 | |
250 | dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ); |
290 | dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ); |
251 | } |
291 | } |
252 | #endif |
292 | #endif |
253 | |
293 | |
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294 | ///////////////////////////////////////////////////////////////////////////// |
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295 | |
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296 | reconnect_all (); |
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297 | |
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298 | ///////////////////////////////////////////////////////////////////////////// |
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299 | |
254 | tap = new tap_device (); |
300 | tap = new tap_device (); |
255 | if (!tap) //D this, of course, never catches |
301 | if (!tap) //D this, of course, never catches |
256 | { |
302 | { |
257 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
303 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
258 | exit (EXIT_FAILURE); |
304 | exit (EXIT_FAILURE); |
259 | } |
305 | } |
260 | |
306 | |
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307 | if (tap->if_up () && |
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308 | !run_script (run_script_cb (this, &vpn::script_if_init), true)) |
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309 | { |
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310 | slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
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311 | tap->if_up ()); |
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312 | exit (EXIT_FAILURE); |
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313 | } |
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314 | |
261 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
315 | if (!run_script (run_script_cb (this, &vpn::script_if_up), true)) |
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316 | { |
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317 | slog (L_ERR, _("if-up command execution failed, exiting.")); |
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318 | exit (EXIT_FAILURE); |
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319 | } |
262 | |
320 | |
263 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
321 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
264 | |
322 | |
265 | reconnect_all (); |
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266 | |
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267 | return 0; |
323 | 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 | } |
324 | } |
302 | |
325 | |
303 | bool |
326 | bool |
304 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
327 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
305 | { |
328 | { |
… | |
… | |
424 | else |
447 | else |
425 | c->recv_vpn_packet (pkt, rsi); |
448 | c->recv_vpn_packet (pkt, rsi); |
426 | } |
449 | } |
427 | } |
450 | } |
428 | |
451 | |
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452 | bool |
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453 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
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454 | { |
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455 | switch (si.prot) |
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456 | { |
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457 | case PROT_IPv4: |
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458 | return send_ipv4_packet (pkt, si, tos); |
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459 | case PROT_UDPv4: |
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460 | return send_udpv4_packet (pkt, si, tos); |
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461 | #if ENABLE_TCP |
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462 | case PROT_TCPv4: |
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463 | return send_tcpv4_packet (pkt, si, tos); |
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464 | #endif |
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465 | #if ENABLE_ICMP |
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466 | case PROT_ICMPv4: |
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467 | return send_icmpv4_packet (pkt, si, tos); |
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468 | #endif |
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469 | #if ENABLE_DNS |
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470 | case PROT_DNSv4: |
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471 | return send_dnsv4_packet (pkt, si, tos); |
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472 | #endif |
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473 | |
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474 | default: |
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475 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
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476 | } |
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477 | |
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478 | return false; |
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479 | } |
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480 | |
429 | void |
481 | void |
430 | vpn::ipv4_ev (io_watcher &w, short revents) |
482 | vpn::ipv4_ev (io_watcher &w, short revents) |
431 | { |
483 | { |
432 | if (revents & EVENT_READ) |
484 | if (revents & EVENT_READ) |
433 | { |
485 | { |
… | |
… | |
442 | |
494 | |
443 | if (len > 0) |
495 | if (len > 0) |
444 | { |
496 | { |
445 | pkt->len = len; |
497 | pkt->len = len; |
446 | |
498 | |
447 | // raw sockets deliver the ipv4, but don't expect it on sends |
499 | // 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); |
500 | pkt->skip_hdr (IP_OVERHEAD); |
450 | |
501 | |
451 | recv_vpn_packet (pkt, si); |
502 | recv_vpn_packet (pkt, si); |
452 | } |
503 | } |
453 | else |
504 | else |
… | |
… | |
459 | delete pkt; |
510 | delete pkt; |
460 | } |
511 | } |
461 | else |
512 | else |
462 | { |
513 | { |
463 | slog (L_ERR, |
514 | slog (L_ERR, |
464 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
515 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
465 | revents); |
516 | revents); |
466 | exit (EXIT_FAILURE); |
517 | exit (EXIT_FAILURE); |
467 | } |
518 | } |
468 | } |
519 | } |
469 | |
520 | |
470 | #if ENABLE_ICMP |
521 | #if ENABLE_ICMP |
… | |
… | |
571 | int dst = mac2id (pkt->dst); |
622 | int dst = mac2id (pkt->dst); |
572 | int src = mac2id (pkt->src); |
623 | int src = mac2id (pkt->src); |
573 | |
624 | |
574 | if (src != THISNODE->id) |
625 | if (src != THISNODE->id) |
575 | { |
626 | { |
576 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
627 | slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); |
577 | exit (EXIT_FAILURE); |
628 | exit (EXIT_FAILURE); |
578 | } |
629 | } |
579 | |
630 | |
580 | if (dst == THISNODE->id) |
631 | if (dst == THISNODE->id) |
581 | { |
632 | { |
… | |
… | |
639 | connection_init (); |
690 | connection_init (); |
640 | |
691 | |
641 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
692 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
642 | i != conf.nodes.end (); ++i) |
693 | i != conf.nodes.end (); ++i) |
643 | { |
694 | { |
644 | connection *conn = new connection (this); |
695 | connection *conn = new connection (this, *i); |
645 | |
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646 | conn->conf = *i; |
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647 | conns.push_back (conn); |
696 | conns.push_back (conn); |
648 | |
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649 | conn->establish_connection (); |
697 | conn->establish_connection (); |
650 | } |
698 | } |
651 | } |
699 | } |
652 | |
700 | |
653 | connection *vpn::find_router () |
701 | connection *vpn::find_router () |