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46 | |
46 | |
47 | vpn network; // THE vpn (bad design...) |
47 | vpn network; // THE vpn (bad design...) |
48 | |
48 | |
49 | ///////////////////////////////////////////////////////////////////////////// |
49 | ///////////////////////////////////////////////////////////////////////////// |
50 | |
50 | |
51 | const char *vpn::script_if_up () |
51 | void |
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52 | vpn::script_init_env () |
52 | { |
53 | { |
53 | // the tunnel device mtu should be the physical mtu - overhead |
54 | // the tunnel device mtu should be the physical mtu - overhead |
54 | // the tricky part is rounding to the cipher key blocksize |
55 | // the tricky part is rounding to the cipher key blocksize |
55 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
56 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
56 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
57 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
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65 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
66 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
66 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
67 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
67 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
68 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
68 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
69 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
69 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
70 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
70 | THISNODE->id & 0xff); |
71 | THISNODE->id & 0xff); putenv (env); |
71 | putenv (env); |
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72 | |
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, |
73 | 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; |
74 | } |
94 | } |
75 | |
95 | |
76 | int |
96 | int |
77 | vpn::setup () |
97 | vpn::setup () |
78 | { |
98 | { |
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235 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
255 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
236 | |
256 | |
237 | if (dnsv4_fd < 0) |
257 | if (dnsv4_fd < 0) |
238 | return -1; |
258 | return -1; |
239 | |
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 |
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269 | |
240 | // standard daemon practise... |
270 | // standard daemon practise... |
241 | { |
271 | { |
242 | int oval = 1; |
272 | int oval = 1; |
243 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
273 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
244 | } |
274 | } |
245 | |
275 | |
246 | 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); |
247 | |
279 | |
248 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
280 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
249 | { |
281 | { |
250 | 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)); |
251 | exit (EXIT_FAILURE); |
283 | exit (EXIT_FAILURE); |
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260 | { |
292 | { |
261 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
293 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
262 | exit (EXIT_FAILURE); |
294 | exit (EXIT_FAILURE); |
263 | } |
295 | } |
264 | |
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 | |
265 | 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 | } |
266 | |
310 | |
267 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
311 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
268 | |
312 | |
269 | reconnect_all (); |
313 | reconnect_all (); |
270 | |
314 | |
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395 | else |
439 | else |
396 | c->recv_vpn_packet (pkt, rsi); |
440 | c->recv_vpn_packet (pkt, rsi); |
397 | } |
441 | } |
398 | } |
442 | } |
399 | |
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 | |
400 | void |
473 | void |
401 | vpn::ipv4_ev (io_watcher &w, short revents) |
474 | vpn::ipv4_ev (io_watcher &w, short revents) |
402 | { |
475 | { |
403 | if (revents & EVENT_READ) |
476 | if (revents & EVENT_READ) |
404 | { |
477 | { |