1 | /* |
1 | /* |
2 | connection.C -- manage a single connection |
2 | connection.C -- manage a single connection |
3 | Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com> |
3 | Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> |
4 | |
4 | |
|
|
5 | This file is part of GVPE. |
|
|
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. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
18 | */ |
20 | */ |
19 | |
21 | |
20 | #include "config.h" |
22 | #include "config.h" |
21 | |
|
|
22 | #include <cassert> |
|
|
23 | |
23 | |
24 | #include <list> |
24 | #include <list> |
25 | |
25 | |
26 | #include <openssl/rand.h> |
26 | #include <openssl/rand.h> |
27 | #include <openssl/evp.h> |
27 | #include <openssl/evp.h> |
28 | #include <openssl/rsa.h> |
28 | #include <openssl/rsa.h> |
29 | #include <openssl/err.h> |
29 | #include <openssl/err.h> |
30 | |
|
|
31 | #include "gettext.h" |
|
|
32 | |
30 | |
33 | #include "conf.h" |
31 | #include "conf.h" |
34 | #include "slog.h" |
32 | #include "slog.h" |
35 | #include "device.h" |
33 | #include "device.h" |
36 | #include "vpn.h" |
34 | #include "vpn.h" |
… | |
… | |
84 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
82 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
85 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
83 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
86 | EVP_MD_CTX_cleanup (&ctx); |
84 | EVP_MD_CTX_cleanup (&ctx); |
87 | } |
85 | } |
88 | |
86 | |
89 | struct rsa_entry { |
87 | struct rsa_entry |
|
|
88 | { |
90 | tstamp expire; |
89 | tstamp expire; |
91 | rsaid id; |
90 | rsaid id; |
92 | rsachallenge chg; |
91 | rsachallenge chg; |
93 | }; |
92 | }; |
94 | |
93 | |
95 | struct rsa_cache : list<rsa_entry> |
94 | struct rsa_cache : list<rsa_entry> |
96 | { |
95 | { |
97 | void cleaner_cb (time_watcher &w); time_watcher cleaner; |
96 | inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner; |
98 | |
97 | |
99 | bool find (const rsaid &id, rsachallenge &chg) |
98 | bool find (const rsaid &id, rsachallenge &chg) |
100 | { |
99 | { |
101 | for (iterator i = begin (); i != end (); ++i) |
100 | for (iterator i = begin (); i != end (); ++i) |
102 | { |
101 | { |
103 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) |
102 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ()) |
104 | { |
103 | { |
105 | memcpy (&chg, &i->chg, sizeof chg); |
104 | memcpy (&chg, &i->chg, sizeof chg); |
106 | |
105 | |
107 | erase (i); |
106 | erase (i); |
108 | return true; |
107 | return true; |
109 | } |
108 | } |
110 | } |
109 | } |
111 | |
110 | |
112 | if (cleaner.at < NOW) |
111 | if (!cleaner.is_active ()) |
113 | cleaner.start (NOW + RSA_TTL); |
112 | cleaner.again (); |
114 | |
113 | |
115 | return false; |
114 | return false; |
116 | } |
115 | } |
117 | |
116 | |
118 | void gen (rsaid &id, rsachallenge &chg) |
117 | void gen (rsaid &id, rsachallenge &chg) |
119 | { |
118 | { |
120 | rsa_entry e; |
119 | rsa_entry e; |
121 | |
120 | |
122 | RAND_bytes ((unsigned char *)&id, sizeof id); |
121 | RAND_bytes ((unsigned char *)&id, sizeof id); |
123 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
122 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
124 | |
123 | |
125 | e.expire = NOW + RSA_TTL; |
124 | e.expire = ev_now () + RSA_TTL; |
126 | e.id = id; |
125 | e.id = id; |
127 | memcpy (&e.chg, &chg, sizeof chg); |
126 | memcpy (&e.chg, &chg, sizeof chg); |
128 | |
127 | |
129 | push_back (e); |
128 | push_back (e); |
130 | |
129 | |
131 | if (cleaner.at < NOW) |
130 | if (!cleaner.is_active ()) |
132 | cleaner.start (NOW + RSA_TTL); |
131 | cleaner.again (); |
133 | } |
132 | } |
134 | |
133 | |
135 | rsa_cache () |
134 | rsa_cache () |
136 | : cleaner (this, &rsa_cache::cleaner_cb) |
135 | { |
137 | { } |
136 | cleaner.set<rsa_cache, &rsa_cache::cleaner_cb> (this); |
|
|
137 | cleaner.set (RSA_TTL, RSA_TTL); |
|
|
138 | } |
138 | |
139 | |
139 | } rsa_cache; |
140 | } rsa_cache; |
140 | |
141 | |
141 | void rsa_cache::cleaner_cb (time_watcher &w) |
142 | void rsa_cache::cleaner_cb (ev::timer &w, int revents) |
142 | { |
143 | { |
143 | if (!empty ()) |
144 | if (empty ()) |
|
|
145 | w.stop (); |
|
|
146 | else |
144 | { |
147 | { |
145 | w.start (NOW + RSA_TTL); |
|
|
146 | |
|
|
147 | for (iterator i = begin (); i != end (); ) |
148 | for (iterator i = begin (); i != end (); ) |
148 | if (i->expire <= NOW) |
149 | if (i->expire <= ev_now ()) |
149 | i = erase (i); |
150 | i = erase (i); |
150 | else |
151 | else |
151 | ++i; |
152 | ++i; |
152 | } |
153 | } |
153 | } |
154 | } |
154 | |
155 | |
155 | ////////////////////////////////////////////////////////////////////////////// |
156 | ////////////////////////////////////////////////////////////////////////////// |
156 | |
157 | |
157 | void pkt_queue::put (net_packet *p) |
158 | pkt_queue::pkt_queue (double max_ttl, int max_queue) |
|
|
159 | : max_ttl (max_ttl), max_queue (max_queue) |
158 | { |
160 | { |
159 | if (queue[i]) |
161 | queue = new pkt [max_queue]; |
160 | { |
|
|
161 | delete queue[i]; |
|
|
162 | j = (j + 1) % QUEUEDEPTH; |
|
|
163 | } |
|
|
164 | |
162 | |
165 | queue[i] = p; |
|
|
166 | |
|
|
167 | i = (i + 1) % QUEUEDEPTH; |
|
|
168 | } |
|
|
169 | |
|
|
170 | net_packet *pkt_queue::get () |
|
|
171 | { |
|
|
172 | net_packet *p = queue[j]; |
|
|
173 | |
|
|
174 | if (p) |
|
|
175 | { |
|
|
176 | queue[j] = 0; |
|
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177 | j = (j + 1) % QUEUEDEPTH; |
|
|
178 | } |
|
|
179 | |
|
|
180 | return p; |
|
|
181 | } |
|
|
182 | |
|
|
183 | pkt_queue::pkt_queue () |
|
|
184 | { |
|
|
185 | memset (queue, 0, sizeof (queue)); |
|
|
186 | i = 0; |
163 | i = 0; |
187 | j = 0; |
164 | j = 0; |
|
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165 | |
|
|
166 | expire.set<pkt_queue, &pkt_queue::expire_cb> (this); |
188 | } |
167 | } |
189 | |
168 | |
190 | pkt_queue::~pkt_queue () |
169 | pkt_queue::~pkt_queue () |
191 | { |
170 | { |
192 | for (i = QUEUEDEPTH; --i > 0; ) |
171 | while (net_packet *p = get ()) |
|
|
172 | delete p; |
|
|
173 | |
193 | delete queue[i]; |
174 | delete [] queue; |
194 | } |
175 | } |
195 | |
176 | |
|
|
177 | void pkt_queue::expire_cb (ev::timer &w, int revents) |
|
|
178 | { |
|
|
179 | ev_tstamp expire = ev_now () - max_ttl; |
|
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180 | |
|
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181 | for (;;) |
|
|
182 | { |
|
|
183 | if (empty ()) |
|
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184 | break; |
|
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185 | |
|
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186 | double diff = queue[j].tstamp - expire; |
|
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187 | |
|
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188 | if (diff >= 0.) |
|
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189 | { |
|
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190 | w.start (diff > 0.5 ? diff : 0.5); |
|
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191 | break; |
|
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192 | } |
|
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193 | |
|
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194 | delete get (); |
|
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195 | } |
|
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196 | } |
|
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197 | |
|
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198 | void pkt_queue::put (net_packet *p) |
|
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199 | { |
|
|
200 | ev_tstamp now = ev_now (); |
|
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201 | |
|
|
202 | // start expiry timer |
|
|
203 | if (empty ()) |
|
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204 | expire.start (max_ttl); |
|
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205 | |
|
|
206 | int ni = i + 1 == max_queue ? 0 : i + 1; |
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207 | |
|
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208 | if (ni == j) |
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209 | delete get (); |
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210 | |
|
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211 | queue[i].pkt = p; |
|
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212 | queue[i].tstamp = now; |
|
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213 | |
|
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214 | i = ni; |
|
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215 | } |
|
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216 | |
|
|
217 | net_packet *pkt_queue::get () |
|
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218 | { |
|
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219 | if (empty ()) |
|
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220 | return 0; |
|
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221 | |
|
|
222 | net_packet *p = queue[j].pkt; |
|
|
223 | queue[j].pkt = 0; |
|
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224 | |
|
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225 | j = j + 1 == max_queue ? 0 : j + 1; |
|
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226 | |
|
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227 | return p; |
|
|
228 | } |
|
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229 | |
196 | struct net_rateinfo { |
230 | struct net_rateinfo |
|
|
231 | { |
197 | u32 host; |
232 | u32 host; |
198 | double pcnt, diff; |
233 | double pcnt, diff; |
199 | tstamp last; |
234 | tstamp last; |
200 | }; |
235 | }; |
201 | |
236 | |
… | |
… | |
220 | iterator i; |
255 | iterator i; |
221 | |
256 | |
222 | for (i = begin (); i != end (); ) |
257 | for (i = begin (); i != end (); ) |
223 | if (i->host == host) |
258 | if (i->host == host) |
224 | break; |
259 | break; |
225 | else if (i->last < NOW - NRL_EXPIRE) |
260 | else if (i->last < ev_now () - NRL_EXPIRE) |
226 | i = erase (i); |
261 | i = erase (i); |
227 | else |
262 | else |
228 | i++; |
263 | i++; |
229 | |
264 | |
230 | if (i == end ()) |
265 | if (i == end ()) |
… | |
… | |
232 | net_rateinfo ri; |
267 | net_rateinfo ri; |
233 | |
268 | |
234 | ri.host = host; |
269 | ri.host = host; |
235 | ri.pcnt = 1.; |
270 | ri.pcnt = 1.; |
236 | ri.diff = NRL_MAXDIF; |
271 | ri.diff = NRL_MAXDIF; |
237 | ri.last = NOW; |
272 | ri.last = ev_now (); |
238 | |
273 | |
239 | push_front (ri); |
274 | push_front (ri); |
240 | |
275 | |
241 | return true; |
276 | return true; |
242 | } |
277 | } |
… | |
… | |
244 | { |
279 | { |
245 | net_rateinfo ri (*i); |
280 | net_rateinfo ri (*i); |
246 | erase (i); |
281 | erase (i); |
247 | |
282 | |
248 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
283 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
249 | ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last); |
284 | ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last); |
250 | |
285 | |
251 | ri.last = NOW; |
286 | ri.last = ev_now (); |
252 | |
287 | |
253 | double dif = ri.diff / ri.pcnt; |
288 | double dif = ri.diff / ri.pcnt; |
254 | |
289 | |
255 | bool send = dif > NRL_CUTOFF; |
290 | bool send = dif > NRL_CUTOFF; |
256 | |
291 | |
… | |
… | |
466 | f |= FEATURE_COMPRESSION; |
501 | f |= FEATURE_COMPRESSION; |
467 | #endif |
502 | #endif |
468 | #if ENABLE_ROHC |
503 | #if ENABLE_ROHC |
469 | f |= FEATURE_ROHC; |
504 | f |= FEATURE_ROHC; |
470 | #endif |
505 | #endif |
|
|
506 | #if ENABLE_BRIDGING |
|
|
507 | f |= FEATURE_BRIDGING; |
|
|
508 | #endif |
471 | return f; |
509 | return f; |
472 | } |
510 | } |
473 | }; |
511 | }; |
474 | |
512 | |
475 | void config_packet::setup (ptype type, int dst) |
513 | void config_packet::setup (ptype type, int dst) |
476 | { |
514 | { |
477 | prot_major = PROTOCOL_MAJOR; |
515 | prot_major = PROTOCOL_MAJOR; |
478 | prot_minor = PROTOCOL_MINOR; |
516 | prot_minor = PROTOCOL_MINOR; |
479 | randsize = RAND_SIZE; |
517 | randsize = RAND_SIZE; |
480 | hmaclen = HMACLENGTH; |
518 | hmaclen = HMACLENGTH; |
481 | flags = ENABLE_COMPRESSION ? 0x81 : 0x80; |
519 | flags = 0; |
482 | challengelen = sizeof (rsachallenge); |
520 | challengelen = sizeof (rsachallenge); |
483 | features = get_features (); |
521 | features = get_features (); |
484 | |
522 | |
485 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
523 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
486 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
524 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
… | |
… | |
496 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
534 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
497 | else if (randsize != RAND_SIZE) |
535 | else if (randsize != RAND_SIZE) |
498 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
536 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
499 | else if (hmaclen != HMACLENGTH) |
537 | else if (hmaclen != HMACLENGTH) |
500 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
538 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
501 | #if 0 // this implementation should handle all flag settings |
|
|
502 | else if (flags != curflags ()) |
|
|
503 | slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ()); |
|
|
504 | #endif |
|
|
505 | else if (challengelen != sizeof (rsachallenge)) |
539 | else if (challengelen != sizeof (rsachallenge)) |
506 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
540 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
507 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
541 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
508 | slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
542 | slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
509 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
543 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
… | |
… | |
585 | ///////////////////////////////////////////////////////////////////////////// |
619 | ///////////////////////////////////////////////////////////////////////////// |
586 | |
620 | |
587 | void |
621 | void |
588 | connection::connection_established () |
622 | connection::connection_established () |
589 | { |
623 | { |
|
|
624 | slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx); |
|
|
625 | |
590 | if (ictx && octx) |
626 | if (ictx && octx) |
591 | { |
627 | { |
592 | connectmode = conf->connectmode; |
|
|
593 | |
|
|
594 | // make sure rekeying timeouts are slightly asymmetric |
628 | // make sure rekeying timeouts are slightly asymmetric |
595 | rekey.start (NOW + ::conf.rekey |
629 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
596 | + (conf->id > THISNODE->id ? 10 : 0)); |
630 | rekey.start (rekey_interval, rekey_interval); |
597 | keepalive.start (NOW + ::conf.keepalive); |
631 | keepalive.start (::conf.keepalive); |
598 | |
632 | |
599 | // send queued packets |
633 | // send queued packets |
600 | if (ictx && octx) |
634 | if (ictx && octx) |
601 | { |
635 | { |
602 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
636 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
603 | { |
637 | { |
604 | send_data_packet (p); |
638 | if (p->len) send_data_packet (p); |
605 | delete p; |
639 | delete p; |
606 | } |
640 | } |
607 | |
641 | |
608 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
642 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
609 | { |
643 | { |
610 | send_vpn_packet (p, si, IPTOS_RELIABILITY); |
644 | if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); |
611 | delete p; |
645 | delete p; |
612 | } |
646 | } |
613 | } |
647 | } |
614 | } |
648 | } |
615 | else |
649 | else |
616 | { |
650 | { |
617 | retry_cnt = 0; |
651 | retry_cnt = 0; |
618 | establish_connection.start (NOW + 5); |
652 | establish_connection.start (5); |
619 | keepalive.stop (); |
653 | keepalive.stop (); |
620 | rekey.stop (); |
654 | rekey.stop (); |
621 | } |
655 | } |
622 | } |
656 | } |
623 | |
657 | |
… | |
… | |
627 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
661 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
628 | |
662 | |
629 | // mask out protocols we cannot establish |
663 | // mask out protocols we cannot establish |
630 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
664 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
631 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
665 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
|
|
666 | if (!conf->dns_port) protocol &= ~PROT_DNSv4; |
|
|
667 | |
|
|
668 | if (protocol |
|
|
669 | && (!conf->can_direct (THISNODE) |
|
|
670 | || !THISNODE->can_direct (conf))) |
|
|
671 | { |
|
|
672 | slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename); |
|
|
673 | protocol = 0; |
|
|
674 | } |
632 | |
675 | |
633 | si.set (conf, protocol); |
676 | si.set (conf, protocol); |
634 | } |
677 | } |
635 | |
678 | |
636 | // ensure sockinfo is valid, forward if necessary |
679 | // ensure sockinfo is valid, forward if necessary |
… | |
… | |
641 | { |
684 | { |
642 | connection *r = vpn->find_router (); |
685 | connection *r = vpn->find_router (); |
643 | |
686 | |
644 | if (r) |
687 | if (r) |
645 | { |
688 | { |
646 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"), |
689 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"), |
647 | conf->nodename, r->conf->nodename); |
690 | conf->nodename, r->conf->nodename, (const char *)r->si); |
648 | return r->si; |
691 | return r->si; |
649 | } |
692 | } |
650 | else |
693 | else |
651 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
694 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
652 | conf->nodename); |
695 | conf->nodename); |
… | |
… | |
722 | } |
765 | } |
723 | |
766 | |
724 | void |
767 | void |
725 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
768 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
726 | { |
769 | { |
727 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
770 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)", |
728 | conf->id, rid, (const char *)rsi); |
771 | conf->id, rid, (const char *)rsi); |
729 | |
772 | |
730 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
773 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
731 | |
774 | |
732 | r->hmac_set (octx); |
775 | r->hmac_set (octx); |
733 | send_vpn_packet (r, si); |
776 | send_vpn_packet (r, si); |
734 | |
777 | |
735 | delete r; |
778 | delete r; |
736 | } |
779 | } |
737 | |
780 | |
738 | void |
781 | inline void |
739 | connection::establish_connection_cb (time_watcher &w) |
782 | connection::establish_connection_cb (ev::timer &w, int revents) |
740 | { |
783 | { |
741 | if (!ictx |
784 | if (!ictx |
742 | && conf != THISNODE |
785 | && conf != THISNODE |
743 | && connectmode != conf_node::C_NEVER |
786 | && connectmode != conf_node::C_NEVER |
744 | && connectmode != conf_node::C_DISABLED |
787 | && connectmode != conf_node::C_DISABLED |
745 | && NOW > w.at) |
788 | && !w.is_active ()) |
746 | { |
789 | { |
747 | double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; |
790 | // a bit hacky, if ondemand, and packets are no longer queued, then reset the connection |
748 | |
791 | // and stop trying. should probably be handled by a per-connection expire handler. |
749 | if (retry_int < conf->max_retry) |
792 | if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ()) |
|
|
793 | { |
|
|
794 | reset_connection (); |
750 | retry_cnt++; |
795 | return; |
751 | else |
796 | } |
752 | retry_int = conf->max_retry; |
|
|
753 | |
797 | |
754 | w.start (NOW + retry_int); |
798 | last_establish_attempt = ev_now (); |
|
|
799 | |
|
|
800 | ev::tstamp retry_int = ev::tstamp (retry_cnt & 3 |
|
|
801 | ? (retry_cnt & 3) + 1 |
|
|
802 | : 1 << (retry_cnt >> 2)); |
755 | |
803 | |
756 | reset_si (); |
804 | reset_si (); |
757 | |
805 | |
|
|
806 | bool slow = si.prot & PROT_SLOW; |
|
|
807 | |
758 | if (si.prot && !si.host) |
808 | if (si.prot && !si.host) |
|
|
809 | { |
|
|
810 | slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename); |
|
|
811 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
|
|
812 | w.start (1); |
759 | vpn->send_connect_request (conf->id); |
813 | vpn->send_connect_request (conf->id); |
|
|
814 | } |
760 | else |
815 | else |
761 | { |
816 | { |
|
|
817 | slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx); |
|
|
818 | |
762 | const sockinfo &dsi = forward_si (si); |
819 | const sockinfo &dsi = forward_si (si); |
|
|
820 | |
|
|
821 | slow = slow || (dsi.prot & PROT_SLOW); |
763 | |
822 | |
764 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
823 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
765 | { |
824 | { |
766 | if (retry_cnt < 4) |
825 | if (retry_cnt < 4) |
767 | send_auth_request (dsi, true); |
826 | send_auth_request (dsi, true); |
768 | else |
827 | else |
769 | send_ping (dsi, 0); |
828 | send_ping (dsi, 0); |
770 | } |
829 | } |
771 | } |
830 | } |
|
|
831 | |
|
|
832 | retry_int *= slow ? 8. : 0.9; |
|
|
833 | |
|
|
834 | if (retry_int < conf->max_retry) |
|
|
835 | retry_cnt++; |
|
|
836 | else |
|
|
837 | retry_int = conf->max_retry; |
|
|
838 | |
|
|
839 | w.start (retry_int); |
772 | } |
840 | } |
773 | } |
841 | } |
774 | |
842 | |
775 | void |
843 | void |
776 | connection::reset_connection () |
844 | connection::reset_connection () |
… | |
… | |
779 | { |
847 | { |
780 | slog (L_INFO, _("%s(%s): connection lost"), |
848 | slog (L_INFO, _("%s(%s): connection lost"), |
781 | conf->nodename, (const char *)si); |
849 | conf->nodename, (const char *)si); |
782 | |
850 | |
783 | if (::conf.script_node_down) |
851 | if (::conf.script_node_down) |
784 | run_script (run_script_cb (this, &connection::script_node_down), false); |
852 | { |
|
|
853 | run_script_cb cb; |
|
|
854 | cb.set<connection, &connection::script_node_down> (this); |
|
|
855 | if (!run_script (cb, false)) |
|
|
856 | slog (L_WARN, _("node-down command execution failed, continuing.")); |
|
|
857 | } |
785 | } |
858 | } |
786 | |
859 | |
787 | delete ictx; ictx = 0; |
860 | delete ictx; ictx = 0; |
788 | delete octx; octx = 0; |
861 | delete octx; octx = 0; |
|
|
862 | #if ENABLE_DNS |
|
|
863 | dnsv4_reset_connection (); |
|
|
864 | #endif |
789 | |
865 | |
790 | si.host = 0; |
866 | si.host = 0; |
791 | |
867 | |
792 | last_activity = 0; |
868 | last_activity = 0; |
793 | retry_cnt = 0; |
869 | retry_cnt = 0; |
… | |
… | |
804 | send_reset (si); |
880 | send_reset (si); |
805 | |
881 | |
806 | reset_connection (); |
882 | reset_connection (); |
807 | } |
883 | } |
808 | |
884 | |
809 | void |
885 | inline void |
810 | connection::rekey_cb (time_watcher &w) |
886 | connection::rekey_cb (ev::timer &w, int revents) |
811 | { |
887 | { |
812 | reset_connection (); |
888 | reset_connection (); |
813 | establish_connection (); |
889 | establish_connection (); |
814 | } |
890 | } |
815 | |
891 | |
… | |
… | |
831 | if (oseqno > MAX_SEQNO) |
907 | if (oseqno > MAX_SEQNO) |
832 | rekey (); |
908 | rekey (); |
833 | } |
909 | } |
834 | |
910 | |
835 | void |
911 | void |
|
|
912 | connection::post_inject_queue () |
|
|
913 | { |
|
|
914 | // force a connection every now and when when packets are sent (max 1/s) |
|
|
915 | if (ev_now () - last_establish_attempt >= 0.95) // arbitrary |
|
|
916 | establish_connection.stop (); |
|
|
917 | |
|
|
918 | establish_connection (); |
|
|
919 | } |
|
|
920 | |
|
|
921 | void |
836 | connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) |
922 | connection::inject_data_packet (tap_packet *pkt) |
837 | { |
923 | { |
838 | if (ictx && octx) |
924 | if (ictx && octx) |
839 | send_data_packet (pkt); |
925 | send_data_packet (pkt); |
840 | else |
926 | else |
841 | { |
927 | { |
842 | if (!broadcast)//DDDD |
|
|
843 | data_queue.put (new tap_packet (*pkt)); |
928 | data_queue.put (new tap_packet (*pkt)); |
844 | |
929 | post_inject_queue (); |
845 | establish_connection (); |
|
|
846 | } |
930 | } |
847 | } |
931 | } |
848 | |
932 | |
849 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
933 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
850 | { |
934 | { |
851 | if (ictx && octx) |
935 | if (ictx && octx) |
852 | send_vpn_packet (pkt, si, tos); |
936 | send_vpn_packet (pkt, si, tos); |
853 | else |
937 | else |
854 | { |
938 | { |
855 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
939 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
856 | |
940 | post_inject_queue (); |
857 | establish_connection (); |
|
|
858 | } |
941 | } |
859 | } |
942 | } |
860 | |
943 | |
861 | void |
944 | void |
862 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
945 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
863 | { |
946 | { |
864 | last_activity = NOW; |
947 | last_activity = ev_now (); |
865 | |
948 | |
866 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
949 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
867 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
950 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
951 | |
|
|
952 | if (connectmode == conf_node::C_DISABLED) |
|
|
953 | return; |
868 | |
954 | |
869 | switch (pkt->typ ()) |
955 | switch (pkt->typ ()) |
870 | { |
956 | { |
871 | case vpn_packet::PT_PING: |
957 | case vpn_packet::PT_PING: |
872 | // we send pings instead of auth packets after some retries, |
958 | // we send pings instead of auth packets after some retries, |
… | |
… | |
932 | delete octx; |
1018 | delete octx; |
933 | |
1019 | |
934 | octx = new crypto_ctx (k, 1); |
1020 | octx = new crypto_ctx (k, 1); |
935 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
1021 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
936 | |
1022 | |
937 | // compatibility code, remove when no longer required |
|
|
938 | if (p->flags & 1) p->features |= FEATURE_COMPRESSION; |
|
|
939 | |
|
|
940 | conf->protocols = p->protocols; |
1023 | conf->protocols = p->protocols; |
941 | features = p->features & config_packet::get_features (); |
1024 | features = p->features & config_packet::get_features (); |
942 | |
1025 | |
943 | send_auth_response (rsi, p->id, k); |
1026 | send_auth_response (rsi, p->id, k); |
944 | |
1027 | |
… | |
… | |
1010 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
1093 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
1011 | conf->nodename, (const char *)rsi, |
1094 | conf->nodename, (const char *)rsi, |
1012 | p->prot_major, p->prot_minor); |
1095 | p->prot_major, p->prot_minor); |
1013 | |
1096 | |
1014 | if (::conf.script_node_up) |
1097 | if (::conf.script_node_up) |
1015 | run_script (run_script_cb (this, &connection::script_node_up), false); |
1098 | { |
|
|
1099 | run_script_cb cb; |
|
|
1100 | cb.set<connection, &connection::script_node_up> (this); |
|
|
1101 | if (!run_script (cb, false)) |
|
|
1102 | slog (L_WARN, _("node-up command execution failed, continuing.")); |
|
|
1103 | } |
1016 | |
1104 | |
1017 | break; |
1105 | break; |
1018 | } |
1106 | } |
1019 | else |
1107 | else |
1020 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
1108 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
… | |
… | |
1054 | { |
1142 | { |
1055 | vpn->tap->send (d); |
1143 | vpn->tap->send (d); |
1056 | |
1144 | |
1057 | if (si != rsi) |
1145 | if (si != rsi) |
1058 | { |
1146 | { |
1059 | // fast re-sync on connection changes, useful especially for tcp/ip |
1147 | // fast re-sync on source address changes, useful especially for tcp/ip |
1060 | si = rsi; |
1148 | si = rsi; |
1061 | |
1149 | |
1062 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1150 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1063 | conf->nodename, (const char *)si, (const char *)rsi); |
1151 | conf->nodename, (const char *)si, (const char *)rsi); |
1064 | } |
1152 | } |
… | |
… | |
1075 | case vpn_packet::PT_CONNECT_REQ: |
1163 | case vpn_packet::PT_CONNECT_REQ: |
1076 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1164 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1077 | { |
1165 | { |
1078 | connect_req_packet *p = (connect_req_packet *) pkt; |
1166 | connect_req_packet *p = (connect_req_packet *) pkt; |
1079 | |
1167 | |
1080 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1168 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1081 | connection *c = vpn->conns[p->id - 1]; |
|
|
1082 | conf->protocols = p->protocols; |
|
|
1083 | |
|
|
1084 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", |
|
|
1085 | conf->id, p->id, c->ictx && c->octx); |
|
|
1086 | |
|
|
1087 | if (c->ictx && c->octx) |
|
|
1088 | { |
1169 | { |
|
|
1170 | connection *c = vpn->conns[p->id - 1]; |
|
|
1171 | conf->protocols = p->protocols; |
|
|
1172 | |
|
|
1173 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]", |
|
|
1174 | conf->id, p->id, c->ictx && c->octx); |
|
|
1175 | |
|
|
1176 | if (c->ictx && c->octx) |
|
|
1177 | { |
1089 | // send connect_info packets to both sides, in case one is |
1178 | // send connect_info packets to both sides, in case one is |
1090 | // behind a nat firewall (or both ;) |
1179 | // behind a nat firewall (or both ;) |
1091 | c->send_connect_info (conf->id, si, conf->protocols); |
1180 | c->send_connect_info (conf->id, si, conf->protocols); |
1092 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
1181 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
|
|
1182 | } |
|
|
1183 | else |
|
|
1184 | c->establish_connection (); |
1093 | } |
1185 | } |
1094 | else |
1186 | else |
1095 | c->establish_connection (); |
1187 | slog (L_WARN, |
|
|
1188 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
|
|
1189 | p->id); |
1096 | } |
1190 | } |
1097 | |
1191 | |
1098 | break; |
1192 | break; |
1099 | |
1193 | |
1100 | case vpn_packet::PT_CONNECT_INFO: |
1194 | case vpn_packet::PT_CONNECT_INFO: |
1101 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1195 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1102 | { |
1196 | { |
1103 | connect_info_packet *p = (connect_info_packet *) pkt; |
1197 | connect_info_packet *p = (connect_info_packet *)pkt; |
1104 | |
1198 | |
1105 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1199 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1106 | |
1200 | { |
1107 | connection *c = vpn->conns[p->id - 1]; |
1201 | connection *c = vpn->conns[p->id - 1]; |
1108 | |
1202 | |
1109 | c->conf->protocols = p->protocols; |
1203 | c->conf->protocols = p->protocols; |
1110 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1204 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1111 | p->si.upgrade_protocol (protocol, c->conf); |
1205 | p->si.upgrade_protocol (protocol, c->conf); |
1112 | |
1206 | |
1113 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1207 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1114 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1208 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1115 | |
1209 | |
1116 | const sockinfo &dsi = forward_si (p->si); |
1210 | const sockinfo &dsi = forward_si (p->si); |
1117 | |
1211 | |
1118 | if (dsi.valid ()) |
1212 | if (dsi.valid ()) |
1119 | c->send_auth_request (dsi, true); |
1213 | c->send_auth_request (dsi, true); |
|
|
1214 | } |
|
|
1215 | else |
|
|
1216 | slog (L_WARN, |
|
|
1217 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
|
|
1218 | p->id); |
1120 | } |
1219 | } |
1121 | |
1220 | |
1122 | break; |
1221 | break; |
1123 | |
1222 | |
1124 | default: |
1223 | default: |
1125 | send_reset (rsi); |
1224 | send_reset (rsi); |
1126 | break; |
1225 | break; |
1127 | } |
1226 | } |
1128 | } |
1227 | } |
1129 | |
1228 | |
1130 | void connection::keepalive_cb (time_watcher &w) |
1229 | inline void |
|
|
1230 | connection::keepalive_cb (ev::timer &w, int revents) |
1131 | { |
1231 | { |
1132 | if (NOW >= last_activity + ::conf.keepalive + 30) |
1232 | if (ev_now () >= last_activity + ::conf.keepalive + 30) |
1133 | { |
1233 | { |
1134 | reset_connection (); |
1234 | reset_connection (); |
1135 | establish_connection (); |
1235 | establish_connection (); |
1136 | } |
1236 | } |
1137 | else if (NOW < last_activity + ::conf.keepalive) |
1237 | else if (ev_now () < last_activity + ::conf.keepalive) |
1138 | w.start (last_activity + ::conf.keepalive); |
1238 | w.start (last_activity + ::conf.keepalive - ev::now ()); |
1139 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1239 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1140 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1240 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1141 | { |
1241 | { |
1142 | send_ping (si); |
1242 | send_ping (si); |
1143 | w.start (NOW + 5); |
1243 | w.start (5); |
1144 | } |
1244 | } |
1145 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1245 | else if (ev_now () < last_activity + ::conf.keepalive + 10) |
1146 | // hold ondemand connections implicitly a few seconds longer |
1246 | // hold ondemand connections implicitly a few seconds longer |
1147 | // should delete octx, though, or something like that ;) |
1247 | // should delete octx, though, or something like that ;) |
1148 | w.start (last_activity + ::conf.keepalive + 10); |
1248 | w.start (last_activity + ::conf.keepalive + 10 - ev::now ()); |
1149 | else |
1249 | else |
1150 | reset_connection (); |
1250 | reset_connection (); |
1151 | } |
1251 | } |
1152 | |
1252 | |
1153 | void connection::send_connect_request (int id) |
1253 | void connection::send_connect_request (int id) |
… | |
… | |
1159 | send_vpn_packet (p, si); |
1259 | send_vpn_packet (p, si); |
1160 | |
1260 | |
1161 | delete p; |
1261 | delete p; |
1162 | } |
1262 | } |
1163 | |
1263 | |
|
|
1264 | void connection::script_init_env (const char *ext) |
|
|
1265 | { |
|
|
1266 | char *env; |
|
|
1267 | asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
|
|
1268 | asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
|
|
1269 | asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
|
|
1270 | 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
|
|
1271 | conf->id & 0xff); putenv (env); |
|
|
1272 | } |
|
|
1273 | |
1164 | void connection::script_node () |
1274 | void connection::script_init_connect_env () |
1165 | { |
1275 | { |
1166 | vpn->script_if_up (); |
1276 | vpn->script_init_env (); |
1167 | |
1277 | |
1168 | char *env; |
1278 | char *env; |
1169 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1279 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1170 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1280 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1171 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1281 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1172 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1282 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1173 | } |
1283 | } |
1174 | |
1284 | |
|
|
1285 | inline const char * |
1175 | const char *connection::script_node_up () |
1286 | connection::script_node_up () |
1176 | { |
1287 | { |
1177 | script_node (); |
1288 | script_init_connect_env (); |
1178 | |
1289 | |
1179 | putenv ("STATE=up"); |
1290 | putenv ((char *)"STATE=up"); |
1180 | |
1291 | |
|
|
1292 | char *filename; |
|
|
1293 | asprintf (&filename, |
|
|
1294 | "%s/%s", |
|
|
1295 | confbase, |
1181 | return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; |
1296 | ::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
1182 | } |
|
|
1183 | |
1297 | |
|
|
1298 | return filename; |
|
|
1299 | } |
|
|
1300 | |
|
|
1301 | inline const char * |
1184 | const char *connection::script_node_down () |
1302 | connection::script_node_down () |
1185 | { |
1303 | { |
1186 | script_node (); |
1304 | script_init_connect_env (); |
1187 | |
1305 | |
1188 | putenv ("STATE=down"); |
1306 | putenv ((char *)"STATE=down"); |
1189 | |
1307 | |
1190 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1308 | char *filename; |
1191 | } |
1309 | asprintf (&filename, |
|
|
1310 | "%s/%s", |
|
|
1311 | confbase, |
|
|
1312 | ::conf.script_node_down ? ::conf.script_node_down : "node-down"); |
1192 | |
1313 | |
|
|
1314 | return filename; |
|
|
1315 | } |
|
|
1316 | |
1193 | connection::connection(struct vpn *vpn_) |
1317 | connection::connection (struct vpn *vpn, conf_node *conf) |
1194 | : vpn(vpn_) |
1318 | : vpn(vpn), conf(conf), |
1195 | , rekey (this, &connection::rekey_cb) |
1319 | #if ENABLE_DNS |
1196 | , keepalive (this, &connection::keepalive_cb) |
1320 | dns (0), |
|
|
1321 | #endif |
|
|
1322 | data_queue(conf->max_ttl, conf->max_queue), |
|
|
1323 | vpn_queue(conf->max_ttl, conf->max_queue) |
|
|
1324 | { |
|
|
1325 | rekey .set<connection, &connection::rekey_cb > (this); |
|
|
1326 | keepalive .set<connection, &connection::keepalive_cb > (this); |
1197 | , establish_connection (this, &connection::establish_connection_cb) |
1327 | establish_connection.set<connection, &connection::establish_connection_cb> (this); |
1198 | { |
1328 | |
|
|
1329 | last_establish_attempt = 0.; |
1199 | octx = ictx = 0; |
1330 | octx = ictx = 0; |
1200 | retry_cnt = 0; |
|
|
1201 | |
1331 | |
1202 | connectmode = conf_node::C_ALWAYS; // initial setting |
1332 | if (!conf->protocols) // make sure some protocol is enabled |
|
|
1333 | conf->protocols = PROT_UDPv4; |
|
|
1334 | |
|
|
1335 | connectmode = conf->connectmode; |
|
|
1336 | |
|
|
1337 | // queue a dummy packet to force an initial connection attempt |
|
|
1338 | if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) |
|
|
1339 | vpn_queue.put (new net_packet); |
|
|
1340 | |
1203 | reset_connection (); |
1341 | reset_connection (); |
1204 | } |
1342 | } |
1205 | |
1343 | |
1206 | connection::~connection () |
1344 | connection::~connection () |
1207 | { |
1345 | { |