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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 |
57 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
58 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
58 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
59 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
59 | |
60 | |
60 | char *env; |
61 | char *env; |
61 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
62 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
62 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env); |
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63 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
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64 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
63 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
65 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
64 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
66 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
65 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
67 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
66 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
68 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
67 | asprintf (&env, "NODES=%d", conns.size ()); putenv (env); |
69 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
68 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
70 | THISNODE->id & 0xff); |
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71 | putenv (env); |
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72 | |
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, |
73 | 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; |
74 | } |
98 | } |
75 | |
99 | |
76 | int |
100 | int |
77 | vpn::setup () |
101 | vpn::setup () |
78 | { |
102 | { |
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173 | // this I really consider a linux bug. I am neither connected |
197 | // this I really consider a linux bug. I am neither connected |
174 | // nor do I fragment myself. Linux still sets DF and doesn't |
198 | // nor do I fragment myself. Linux still sets DF and doesn't |
175 | // fragment for me sometimes. |
199 | // fragment for me sometimes. |
176 | { |
200 | { |
177 | int oval = IP_PMTUDISC_DONT; |
201 | int oval = IP_PMTUDISC_DONT; |
178 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
202 | setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
179 | } |
203 | } |
180 | #endif |
204 | #endif |
181 | |
205 | |
182 | sockinfo si (THISNODE, PROT_ICMPv4); |
206 | sockinfo si (THISNODE, PROT_ICMPv4); |
183 | |
207 | |
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235 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
259 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
236 | |
260 | |
237 | if (dnsv4_fd < 0) |
261 | if (dnsv4_fd < 0) |
238 | return -1; |
262 | return -1; |
239 | |
263 | |
240 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
264 | # if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
241 | // this I really consider a linux bug. I am neither connected |
265 | // this I really consider a linux bug. I am neither connected |
242 | // nor do I fragment myself. Linux still sets DF and doesn't |
266 | // nor do I fragment myself. Linux still sets DF and doesn't |
243 | // fragment for me sometimes. |
267 | // fragment for me sometimes. |
244 | { |
268 | { |
245 | int oval = IP_PMTUDISC_DONT; |
269 | int oval = IP_PMTUDISC_DONT; |
246 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
270 | setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
247 | } |
271 | } |
248 | #endif |
272 | # endif |
249 | |
273 | |
250 | // standard daemon practise... |
274 | // standard daemon practise... |
251 | { |
275 | { |
252 | int oval = 1; |
276 | int oval = 1; |
253 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
277 | setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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265 | |
289 | |
266 | dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ); |
290 | dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ); |
267 | } |
291 | } |
268 | #endif |
292 | #endif |
269 | |
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 | |
270 | tap = new tap_device (); |
300 | tap = new tap_device (); |
271 | if (!tap) //D this, of course, never catches |
301 | if (!tap) //D this, of course, never catches |
272 | { |
302 | { |
273 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
303 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
274 | exit (EXIT_FAILURE); |
304 | exit (EXIT_FAILURE); |
275 | } |
305 | } |
276 | |
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 | |
277 | 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 | } |
278 | |
320 | |
279 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
321 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
280 | |
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281 | reconnect_all (); |
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282 | |
322 | |
283 | return 0; |
323 | return 0; |
284 | } |
324 | } |
285 | |
325 | |
286 | bool |
326 | bool |