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Comparing gvpe/src/connection.C (file contents):
Revision 1.43 by pcg, Fri Mar 4 04:52:38 2005 UTC vs.
Revision 1.93 by root, Tue Feb 15 13:31:23 2011 UTC

1/* 1/*
2 connection.C -- manage a single connection 2 connection.C -- manage a single connection
3 Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> 3 Copyright (C) 2003-2008,2010,2011 Marc Lehmann <gvpe@schmorp.de>
4 4
5 This file is part of GVPE. 5 This file is part of GVPE.
6 6
7 GVPE is free software; you can redistribute it and/or modify 7 GVPE is free software; you can redistribute it and/or modify it
8 it under the terms of the GNU General Public License as published by 8 under the terms of the GNU General Public License as published by the
9 the Free Software Foundation; either version 2 of the License, or 9 Free Software Foundation; either version 3 of the License, or (at your
10 (at your option) any later version. 10 option) any later version.
11 11
12 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, but
13 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
15 GNU General Public License for more details. 15 Public License for more details.
16 16
17 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 along
18 along with gvpe; if not, write to the Free Software 18 with this program; if not, see <http://www.gnu.org/licenses/>.
19 Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19
20 Additional permission under GNU GPL version 3 section 7
21
22 If you modify this Program, or any covered work, by linking or
23 combining it with the OpenSSL project's OpenSSL library (or a modified
24 version of that library), containing parts covered by the terms of the
25 OpenSSL or SSLeay licenses, the licensors of this Program grant you
26 additional permission to convey the resulting work. Corresponding
27 Source for a non-source form of such a combination shall include the
28 source code for the parts of OpenSSL used as well as that of the
29 covered work.
20*/ 30*/
21 31
22#include "config.h" 32#include "config.h"
23 33
24#include <cassert>
25
26#include <list> 34#include <list>
35#include <queue>
36#include <utility>
27 37
28#include <openssl/rand.h> 38#include <openssl/rand.h>
29#include <openssl/evp.h> 39#include <openssl/evp.h>
30#include <openssl/rsa.h> 40#include <openssl/rsa.h>
31#include <openssl/err.h> 41#include <openssl/err.h>
32
33#include "gettext.h"
34 42
35#include "conf.h" 43#include "conf.h"
36#include "slog.h" 44#include "slog.h"
37#include "device.h" 45#include "device.h"
38#include "vpn.h" 46#include "vpn.h"
… …
42 50
43#if !HAVE_RAND_PSEUDO_BYTES 51#if !HAVE_RAND_PSEUDO_BYTES
44# define RAND_pseudo_bytes RAND_bytes 52# define RAND_pseudo_bytes RAND_bytes
45#endif 53#endif
46 54
47#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic 55#define MAGIC_OLD "vped\xbd\xc6\xdb\x82" // 8 bytes of magic (still used in the protocol)
56#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic (understood but not generated)
48 57
49#define ULTRA_FAST 1 58#define ULTRA_FAST 1
50#define HLOG 15 59#define HLOG 15
51#include "lzf/lzf.h" 60#include "lzf/lzf.h"
52#include "lzf/lzf_c.c" 61#include "lzf/lzf_c.c"
53#include "lzf/lzf_d.c" 62#include "lzf/lzf_d.c"
63
64//////////////////////////////////////////////////////////////////////////////
65
66static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
67static ev::child rs_child_ev;
68
69namespace
70{
71 void // c++ requires external linkage here, apparently :(
72 rs_child_cb (ev::child &w, int revents)
73 {
74 w.stop ();
75
76 if (rs_queue.empty ())
77 return;
78
79 pid_t pid = run_script (*rs_queue.front ().first, false);
80 if (pid)
81 {
82 w.set (pid);
83 w.start ();
84 }
85 else
86 slog (L_WARN, rs_queue.front ().second);
87
88 delete rs_queue.front ().first;
89 rs_queue.pop ();
90 }
91};
92
93// despite the fancy name, this is quite a hack
94static void
95run_script_queued (run_script_cb *cb, const char *warnmsg)
96{
97 rs_queue.push (std::make_pair (cb, warnmsg));
98
99 if (!rs_child_ev.is_active ())
100 {
101 rs_child_ev.set<rs_child_cb> ();
102 rs_child_ev ();
103 }
104}
105
106//////////////////////////////////////////////////////////////////////////////
54 107
55struct crypto_ctx 108struct crypto_ctx
56{ 109{
57 EVP_CIPHER_CTX cctx; 110 EVP_CIPHER_CTX cctx;
58 HMAC_CTX hctx; 111 HMAC_CTX hctx;
… …
86 require (EVP_DigestUpdate(&ctx, &id, sizeof id)); 139 require (EVP_DigestUpdate(&ctx, &id, sizeof id));
87 require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); 140 require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
88 EVP_MD_CTX_cleanup (&ctx); 141 EVP_MD_CTX_cleanup (&ctx);
89} 142}
90 143
91struct rsa_entry { 144struct rsa_entry
145{
92 tstamp expire; 146 tstamp expire;
93 rsaid id; 147 rsaid id;
94 rsachallenge chg; 148 rsachallenge chg;
95}; 149};
96 150
97struct rsa_cache : list<rsa_entry> 151struct rsa_cache : list<rsa_entry>
98{ 152{
99 void cleaner_cb (time_watcher &w); time_watcher cleaner; 153 inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;
100 154
101 bool find (const rsaid &id, rsachallenge &chg) 155 bool find (const rsaid &id, rsachallenge &chg)
102 { 156 {
103 for (iterator i = begin (); i != end (); ++i) 157 for (iterator i = begin (); i != end (); ++i)
104 { 158 {
105 if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) 159 if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ())
106 { 160 {
107 memcpy (&chg, &i->chg, sizeof chg); 161 memcpy (&chg, &i->chg, sizeof chg);
108 162
109 erase (i); 163 erase (i);
110 return true; 164 return true;
111 } 165 }
112 } 166 }
113 167
114 if (cleaner.at < NOW) 168 if (!cleaner.is_active ())
115 cleaner.start (NOW + RSA_TTL); 169 cleaner.again ();
116 170
117 return false; 171 return false;
118 } 172 }
119 173
120 void gen (rsaid &id, rsachallenge &chg) 174 void gen (rsaid &id, rsachallenge &chg)
121 { 175 {
122 rsa_entry e; 176 rsa_entry e;
123 177
124 RAND_bytes ((unsigned char *)&id, sizeof id); 178 RAND_bytes ((unsigned char *)&id, sizeof id);
125 RAND_bytes ((unsigned char *)&chg, sizeof chg); 179 RAND_bytes ((unsigned char *)&chg, sizeof chg);
126 180
127 e.expire = NOW + RSA_TTL; 181 e.expire = ev_now () + RSA_TTL;
128 e.id = id; 182 e.id = id;
129 memcpy (&e.chg, &chg, sizeof chg); 183 memcpy (&e.chg, &chg, sizeof chg);
130 184
131 push_back (e); 185 push_back (e);
132 186
133 if (cleaner.at < NOW) 187 if (!cleaner.is_active ())
134 cleaner.start (NOW + RSA_TTL); 188 cleaner.again ();
135 } 189 }
136 190
137 rsa_cache () 191 rsa_cache ()
138 : cleaner (this, &rsa_cache::cleaner_cb) 192 {
139 { } 193 cleaner.set<rsa_cache, &rsa_cache::cleaner_cb> (this);
194 cleaner.set (RSA_TTL, RSA_TTL);
195 }
140 196
141} rsa_cache; 197} rsa_cache;
142 198
143void rsa_cache::cleaner_cb (time_watcher &w) 199void
200rsa_cache::cleaner_cb (ev::timer &w, int revents)
144{ 201{
145 if (!empty ()) 202 if (empty ())
203 w.stop ();
204 else
146 { 205 {
147 w.start (NOW + RSA_TTL);
148
149 for (iterator i = begin (); i != end (); ) 206 for (iterator i = begin (); i != end (); )
150 if (i->expire <= NOW) 207 if (i->expire <= ev_now ())
151 i = erase (i); 208 i = erase (i);
152 else 209 else
153 ++i; 210 ++i;
154 } 211 }
155} 212}
156 213
157////////////////////////////////////////////////////////////////////////////// 214//////////////////////////////////////////////////////////////////////////////
158 215
159void pkt_queue::put (net_packet *p) 216pkt_queue::pkt_queue (double max_ttl, int max_queue)
217: max_ttl (max_ttl), max_queue (max_queue)
160{ 218{
161 if (queue[i]) 219 queue = new pkt [max_queue];
162 {
163 delete queue[i];
164 j = (j + 1) % QUEUEDEPTH;
165 }
166 220
167 queue[i] = p;
168
169 i = (i + 1) % QUEUEDEPTH;
170}
171
172net_packet *pkt_queue::get ()
173{
174 net_packet *p = queue[j];
175
176 if (p)
177 {
178 queue[j] = 0;
179 j = (j + 1) % QUEUEDEPTH;
180 }
181
182 return p;
183}
184
185pkt_queue::pkt_queue ()
186{
187 memset (queue, 0, sizeof (queue));
188 i = 0; 221 i = 0;
189 j = 0; 222 j = 0;
223
224 expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
190} 225}
191 226
192pkt_queue::~pkt_queue () 227pkt_queue::~pkt_queue ()
193{ 228{
194 for (i = QUEUEDEPTH; --i > 0; ) 229 while (net_packet *p = get ())
230 delete p;
231
195 delete queue[i]; 232 delete [] queue;
196} 233}
197 234
235void
236pkt_queue::expire_cb (ev::timer &w, int revents)
237{
238 ev_tstamp expire = ev_now () - max_ttl;
239
240 for (;;)
241 {
242 if (empty ())
243 break;
244
245 double diff = queue[j].tstamp - expire;
246
247 if (diff >= 0.)
248 {
249 w.start (diff > 0.5 ? diff : 0.5);
250 break;
251 }
252
253 delete get ();
254 }
255}
256
257void
258pkt_queue::put (net_packet *p)
259{
260 ev_tstamp now = ev_now ();
261
262 // start expiry timer
263 if (empty ())
264 expire.start (max_ttl);
265
266 int ni = i + 1 == max_queue ? 0 : i + 1;
267
268 if (ni == j)
269 delete get ();
270
271 queue[i].pkt = p;
272 queue[i].tstamp = now;
273
274 i = ni;
275}
276
277net_packet *
278pkt_queue::get ()
279{
280 if (empty ())
281 return 0;
282
283 net_packet *p = queue[j].pkt;
284 queue[j].pkt = 0;
285
286 j = j + 1 == max_queue ? 0 : j + 1;
287
288 return p;
289}
290
198struct net_rateinfo { 291struct net_rateinfo
292{
199 u32 host; 293 u32 host;
200 double pcnt, diff; 294 double pcnt, diff;
201 tstamp last; 295 tstamp last;
202}; 296};
203 297
… …
213 307
214 bool can (const sockinfo &si) { return can((u32)si.host); } 308 bool can (const sockinfo &si) { return can((u32)si.host); }
215 bool can (u32 host); 309 bool can (u32 host);
216}; 310};
217 311
218net_rate_limiter auth_rate_limiter, reset_rate_limiter; 312static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
219 313
314bool
220bool net_rate_limiter::can (u32 host) 315net_rate_limiter::can (u32 host)
221{ 316{
222 iterator i; 317 iterator i;
223 318
224 for (i = begin (); i != end (); ) 319 for (i = begin (); i != end (); )
225 if (i->host == host) 320 if (i->host == host)
226 break; 321 break;
227 else if (i->last < NOW - NRL_EXPIRE) 322 else if (i->last < ev_now () - NRL_EXPIRE)
228 i = erase (i); 323 i = erase (i);
229 else 324 else
230 i++; 325 i++;
231 326
232 if (i == end ()) 327 if (i == end ())
… …
234 net_rateinfo ri; 329 net_rateinfo ri;
235 330
236 ri.host = host; 331 ri.host = host;
237 ri.pcnt = 1.; 332 ri.pcnt = 1.;
238 ri.diff = NRL_MAXDIF; 333 ri.diff = NRL_MAXDIF;
239 ri.last = NOW; 334 ri.last = ev_now ();
240 335
241 push_front (ri); 336 push_front (ri);
242 337
243 return true; 338 return true;
244 } 339 }
… …
246 { 341 {
247 net_rateinfo ri (*i); 342 net_rateinfo ri (*i);
248 erase (i); 343 erase (i);
249 344
250 ri.pcnt = ri.pcnt * NRL_ALPHA; 345 ri.pcnt = ri.pcnt * NRL_ALPHA;
251 ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last); 346 ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
252 347
253 ri.last = NOW; 348 ri.last = ev_now ();
254 349
255 double dif = ri.diff / ri.pcnt; 350 double dif = ri.diff / ri.pcnt;
256 351
257 bool send = dif > NRL_CUTOFF; 352 bool send = dif > NRL_CUTOFF;
258 353
… …
272 367
273///////////////////////////////////////////////////////////////////////////// 368/////////////////////////////////////////////////////////////////////////////
274 369
275unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE]; 370unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];
276 371
372void
277void hmac_packet::hmac_gen (crypto_ctx *ctx) 373hmac_packet::hmac_gen (crypto_ctx *ctx)
278{ 374{
279 unsigned int xlen; 375 unsigned int xlen;
280 376
281 HMAC_CTX *hctx = &ctx->hctx; 377 HMAC_CTX *hctx = &ctx->hctx;
282 378
… …
300 hmac_gen (ctx); 396 hmac_gen (ctx);
301 397
302 return !memcmp (hmac, hmac_digest, HMACLENGTH); 398 return !memcmp (hmac, hmac_digest, HMACLENGTH);
303} 399}
304 400
401void
305void vpn_packet::set_hdr (ptype type_, unsigned int dst) 402vpn_packet::set_hdr (ptype type_, unsigned int dst)
306{ 403{
307 type = type_; 404 type = type_;
308 405
309 int src = THISNODE->id; 406 int src = THISNODE->id;
310 407
… …
315 412
316#define MAXVPNDATA (MAX_MTU - 6 - 6) 413#define MAXVPNDATA (MAX_MTU - 6 - 6)
317#define DATAHDR (sizeof (u32) + RAND_SIZE) 414#define DATAHDR (sizeof (u32) + RAND_SIZE)
318 415
319struct vpndata_packet : vpn_packet 416struct vpndata_packet : vpn_packet
417{
418 u8 data[MAXVPNDATA + DATAHDR]; // seqno
419
420 void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
421 tap_packet *unpack (connection *conn, u32 &seqno);
422
423private:
424 const u32 data_hdr_size () const
320 { 425 {
321 u8 data[MAXVPNDATA + DATAHDR]; // seqno
322
323 void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
324 tap_packet *unpack (connection *conn, u32 &seqno);
325private:
326
327 const u32 data_hdr_size () const
328 {
329 return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; 426 return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
330 }
331 }; 427 }
428};
332 429
333void 430void
334vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) 431vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
335{ 432{
336 EVP_CIPHER_CTX *cctx = &conn->octx->cctx; 433 EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
… …
338 ptype type = PT_DATA_UNCOMPRESSED; 435 ptype type = PT_DATA_UNCOMPRESSED;
339 436
340#if ENABLE_COMPRESSION 437#if ENABLE_COMPRESSION
341 u8 cdata[MAX_MTU]; 438 u8 cdata[MAX_MTU];
342 439
343 if (conn->features & ENABLE_COMPRESSION) 440 if (conn->features & FEATURE_COMPRESSION)
344 { 441 {
345 u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); 442 u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
346 443
347 if (cl) 444 if (cl)
348 { 445 {
… …
468 f |= FEATURE_COMPRESSION; 565 f |= FEATURE_COMPRESSION;
469#endif 566#endif
470#if ENABLE_ROHC 567#if ENABLE_ROHC
471 f |= FEATURE_ROHC; 568 f |= FEATURE_ROHC;
472#endif 569#endif
570#if ENABLE_BRIDGING
571 f |= FEATURE_BRIDGING;
572#endif
473 return f; 573 return f;
474 } 574 }
475}; 575};
476 576
577void
477void config_packet::setup (ptype type, int dst) 578config_packet::setup (ptype type, int dst)
478{ 579{
479 prot_major = PROTOCOL_MAJOR; 580 prot_major = PROTOCOL_MAJOR;
480 prot_minor = PROTOCOL_MINOR; 581 prot_minor = PROTOCOL_MINOR;
481 randsize = RAND_SIZE; 582 randsize = RAND_SIZE;
482 hmaclen = HMACLENGTH; 583 hmaclen = HMACLENGTH;
483 flags = ENABLE_COMPRESSION ? 0x81 : 0x80; 584 flags = 0;
484 challengelen = sizeof (rsachallenge); 585 challengelen = sizeof (rsachallenge);
485 features = get_features (); 586 features = get_features ();
486 587
487 cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); 588 cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
488 digest_nid = htonl (EVP_MD_type (RSA_HASH)); 589 digest_nid = htonl (EVP_MD_type (RSA_HASH));
… …
490 591
491 len = sizeof (*this) - sizeof (net_packet); 592 len = sizeof (*this) - sizeof (net_packet);
492 set_hdr (type, dst); 593 set_hdr (type, dst);
493} 594}
494 595
596bool
495bool config_packet::chk_config () const 597config_packet::chk_config () const
496{ 598{
497 if (prot_major != PROTOCOL_MAJOR) 599 if (prot_major != PROTOCOL_MAJOR)
498 slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); 600 slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
499 else if (randsize != RAND_SIZE) 601 else if (randsize != RAND_SIZE)
500 slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); 602 slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
501 else if (hmaclen != HMACLENGTH) 603 else if (hmaclen != HMACLENGTH)
502 slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); 604 slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
503#if 0 // this implementation should handle all flag settings
504 else if (flags != curflags ())
505 slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
506#endif
507 else if (challengelen != sizeof (rsachallenge)) 605 else if (challengelen != sizeof (rsachallenge))
508 slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); 606 slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
509 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) 607 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
510 slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); 608 slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));
511 else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) 609 else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
… …
528 rsaencrdata encr; 626 rsaencrdata encr;
529 627
530 auth_req_packet (int dst, bool initiate_, u8 protocols_) 628 auth_req_packet (int dst, bool initiate_, u8 protocols_)
531 { 629 {
532 config_packet::setup (PT_AUTH_REQ, dst); 630 config_packet::setup (PT_AUTH_REQ, dst);
533 strncpy (magic, MAGIC, 8); 631 strncpy (magic, MAGIC_OLD, 8);
534 initiate = !!initiate_; 632 initiate = !!initiate_;
535 protocols = protocols_; 633 protocols = protocols_;
536 634
537 len = sizeof (*this) - sizeof (net_packet); 635 len = sizeof (*this) - sizeof (net_packet);
538 } 636 }
… …
587///////////////////////////////////////////////////////////////////////////// 685/////////////////////////////////////////////////////////////////////////////
588 686
589void 687void
590connection::connection_established () 688connection::connection_established ()
591{ 689{
690 slog (L_NOISE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx);
691
592 if (ictx && octx) 692 if (ictx && octx)
593 { 693 {
594 connectmode = conf->connectmode;
595
596 // make sure rekeying timeouts are slightly asymmetric 694 // make sure rekeying timeouts are slightly asymmetric
597 rekey.start (NOW + ::conf.rekey 695 ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
598 + (conf->id > THISNODE->id ? 10 : 0)); 696 rekey.start (rekey_interval, rekey_interval);
599 keepalive.start (NOW + ::conf.keepalive); 697 keepalive.start (::conf.keepalive);
600 698
601 // send queued packets 699 // send queued packets
602 if (ictx && octx) 700 if (ictx && octx)
603 { 701 {
604 while (tap_packet *p = (tap_packet *)data_queue.get ()) 702 while (tap_packet *p = (tap_packet *)data_queue.get ())
605 { 703 {
606 send_data_packet (p); 704 if (p->len) send_data_packet (p);
607 delete p; 705 delete p;
608 } 706 }
609 707
610 while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) 708 while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
611 { 709 {
612 send_vpn_packet (p, si, IPTOS_RELIABILITY); 710 if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
613 delete p; 711 delete p;
614 } 712 }
615 } 713 }
714
715 vpn->connection_established (this);
616 } 716 }
617 else 717 else
618 { 718 {
619 retry_cnt = 0; 719 retry_cnt = 0;
620 establish_connection.start (NOW + 5); 720 establish_connection.start (5);
621 keepalive.stop (); 721 keepalive.stop ();
622 rekey.stop (); 722 rekey.stop ();
623 } 723 }
624} 724}
625 725
626void 726void
627connection::reset_si () 727connection::reset_si ()
628{ 728{
729 if (vpn->can_direct (THISNODE, conf))
629 protocol = best_protocol (THISNODE->protocols & conf->protocols); 730 protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
630 731 else
631 // mask out protocols we cannot establish 732 {
632 if (!conf->udp_port) protocol &= ~PROT_UDPv4; 733 slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
633 if (!conf->tcp_port) protocol &= ~PROT_TCPv4; 734 protocol = 0;
634 if (!conf->dns_port) protocol &= ~PROT_DNSv4; 735 }
635 736
636 si.set (conf, protocol); 737 si.set (conf, protocol);
738
739 is_direct = si.valid ();
637} 740}
638 741
639// ensure sockinfo is valid, forward if necessary 742// ensure sockinfo is valid, forward if necessary
640const sockinfo & 743const sockinfo &
641connection::forward_si (const sockinfo &si) const 744connection::forward_si (const sockinfo &si) const
642{ 745{
643 if (!si.valid ()) 746 if (!si.valid ())
644 { 747 {
645 connection *r = vpn->find_router (); 748 connection *r = vpn->find_router_for (this);
646 749
647 if (r) 750 if (r)
648 { 751 {
649 slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"), 752 slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
650 conf->nodename, r->conf->nodename); 753 conf->nodename, r->conf->nodename);
651 return r->si; 754 return r->si;
652 } 755 }
653 else 756 else
654 slog (L_DEBUG, _("%s: node unreachable, no common protocol"), 757 slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
655 conf->nodename); 758 conf->nodename);
656 } 759 }
657 760
658 return si; 761 return si;
659} 762}
660 763
661void 764void
662connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) 765connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
663{ 766{
664 bool ok; 767 if (!vpn->send_vpn_packet (pkt, si, tos))
665
666 switch (si.prot)
667 {
668 case PROT_IPv4:
669 ok = vpn->send_ipv4_packet (pkt, si, tos); break;
670 case PROT_UDPv4:
671 ok = vpn->send_udpv4_packet (pkt, si, tos); break;
672#if ENABLE_TCP
673 case PROT_TCPv4:
674 ok = vpn->send_tcpv4_packet (pkt, si, tos); break;
675#endif
676#if ENABLE_ICMP
677 case PROT_ICMPv4:
678 ok = vpn->send_icmpv4_packet (pkt, si, tos); break;
679#endif
680#if ENABLE_DNS
681 case PROT_DNSv4:
682 ok = send_dnsv4_packet (pkt, si, tos); break;
683#endif
684
685 default:
686 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
687 ok = false;
688 }
689
690 if (!ok)
691 reset_connection (); 768 reset_connection ();
692} 769}
693 770
694void 771void
695connection::send_ping (const sockinfo &si, u8 pong) 772connection::send_ping (const sockinfo &si, u8 pong)
696{ 773{
697 ping_packet *pkt = new ping_packet; 774 ping_packet *pkt = new ping_packet;
698 775
699 pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); 776 pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
777
778 slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
779
700 send_vpn_packet (pkt, si, IPTOS_LOWDELAY); 780 send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
701 781
702 delete pkt; 782 delete pkt;
703} 783}
704 784
… …
723 803
724 rsachallenge chg; 804 rsachallenge chg;
725 rsa_cache.gen (pkt->id, chg); 805 rsa_cache.gen (pkt->id, chg);
726 rsa_encrypt (conf->rsa_key, chg, pkt->encr); 806 rsa_encrypt (conf->rsa_key, chg, pkt->encr);
727 807
728 slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); 808 slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
729 809
730 send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly 810 send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
731 811
732 delete pkt; 812 delete pkt;
733} 813}
… …
741 821
742 rsa_hash (id, chg, pkt->response); 822 rsa_hash (id, chg, pkt->response);
743 823
744 pkt->hmac_set (octx); 824 pkt->hmac_set (octx);
745 825
746 slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si); 826 slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
747 827
748 send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly 828 send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
749 829
750 delete pkt; 830 delete pkt;
751} 831}
752 832
753void 833void
754connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) 834connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
755{ 835{
756 slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", 836 slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
757 conf->id, rid, (const char *)rsi); 837 vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
838 conf->protocols);
758 839
759 connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); 840 connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
760 841
761 r->hmac_set (octx); 842 r->hmac_set (octx);
762 send_vpn_packet (r, si); 843 send_vpn_packet (r, si);
763 844
764 delete r; 845 delete r;
765} 846}
766 847
767void 848inline void
768connection::establish_connection_cb (time_watcher &w) 849connection::establish_connection_cb (ev::timer &w, int revents)
769{ 850{
770 if (!ictx 851 if (!(ictx && octx)
771 && conf != THISNODE 852 && conf != THISNODE
772 && connectmode != conf_node::C_NEVER 853 && connectmode != conf_node::C_NEVER
773 && connectmode != conf_node::C_DISABLED 854 && connectmode != conf_node::C_DISABLED
774 && NOW > w.at) 855 && !w.is_active ())
775 { 856 {
776 double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; 857 // a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
777 858 // and stop trying. should probably be handled by a per-connection expire handler.
778 if (retry_int < conf->max_retry) 859 if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
860 {
861 reset_connection ();
779 retry_cnt++; 862 return;
780 else 863 }
781 retry_int = conf->max_retry;
782 864
783 w.start (NOW + retry_int); 865 last_establish_attempt = ev_now ();
866
867 ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
868 ? (retry_cnt & 3) + 1
869 : 1 << (retry_cnt >> 2));
784 870
785 reset_si (); 871 reset_si ();
786 872
787 if (si.prot && !si.host) 873 bool slow = si.prot & PROT_SLOW;
874
875 if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
876 {
877 /*TODO*/ /* start the timer so we don't recurse endlessly */
878 w.start (1);
788 vpn->send_connect_request (conf->id); 879 vpn->send_connect_request (this);
880 }
789 else 881 else
790 { 882 {
883 if (si.valid ())
884 slog (L_DEBUG, _("%s: sending direct connection request to %s."),
885 conf->nodename, (const char *)si);
886
791 const sockinfo &dsi = forward_si (si); 887 const sockinfo &dsi = forward_si (si);
888
889 slow = slow || (dsi.prot & PROT_SLOW);
792 890
793 if (dsi.valid () && auth_rate_limiter.can (dsi)) 891 if (dsi.valid () && auth_rate_limiter.can (dsi))
794 { 892 {
795 if (retry_cnt < 4) 893 if (retry_cnt < 4)
796 send_auth_request (dsi, true); 894 send_auth_request (dsi, true);
797 else 895 else
798 send_ping (dsi, 0); 896 send_ping (dsi, 0);
799 } 897 }
800 } 898 }
899
900 retry_int *= slow ? 8. : 0.9;
901
902 if (retry_int < conf->max_retry)
903 retry_cnt++;
904 else
905 retry_int = conf->max_retry;
906
907 w.start (retry_int);
801 } 908 }
802} 909}
803 910
804void 911void
805connection::reset_connection () 912connection::reset_connection ()
… …
808 { 915 {
809 slog (L_INFO, _("%s(%s): connection lost"), 916 slog (L_INFO, _("%s(%s): connection lost"),
810 conf->nodename, (const char *)si); 917 conf->nodename, (const char *)si);
811 918
812 if (::conf.script_node_down) 919 if (::conf.script_node_down)
813 run_script (run_script_cb (this, &connection::script_node_down), false); 920 {
921 run_script_cb *cb = new run_script_cb;
922 cb->set<connection, &connection::script_node_down> (this);
923 run_script_queued (cb, _("node-down command execution failed, continuing."));
924 }
814 } 925 }
815 926
816 delete ictx; ictx = 0; 927 delete ictx; ictx = 0;
817 delete octx; octx = 0; 928 delete octx; octx = 0;
929#if ENABLE_DNS
930 dnsv4_reset_connection ();
931#endif
818 932
819 si.host = 0; 933 si.host = 0;
820 934
821 last_activity = 0; 935 last_activity = 0.;
936 //last_si_change = 0.;
822 retry_cnt = 0; 937 retry_cnt = 0;
823 938
824 rekey.stop (); 939 rekey.stop ();
825 keepalive.stop (); 940 keepalive.stop ();
826 establish_connection.stop (); 941 establish_connection.stop ();
… …
833 send_reset (si); 948 send_reset (si);
834 949
835 reset_connection (); 950 reset_connection ();
836} 951}
837 952
838void 953// poor-man's rekeying
839connection::rekey_cb (time_watcher &w) 954inline void
955connection::rekey_cb (ev::timer &w, int revents)
840{ 956{
841 reset_connection (); 957 reset_connection ();
842 establish_connection (); 958 establish_connection ();
843} 959}
844 960
… …
860 if (oseqno > MAX_SEQNO) 976 if (oseqno > MAX_SEQNO)
861 rekey (); 977 rekey ();
862} 978}
863 979
864void 980void
981connection::post_inject_queue ()
982{
983 // force a connection every now and when when packets are sent (max 1/s)
984 if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
985 establish_connection.stop ();
986
987 establish_connection ();
988}
989
990void
865connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) 991connection::inject_data_packet (tap_packet *pkt)
866{ 992{
867 if (ictx && octx) 993 if (ictx && octx)
868 send_data_packet (pkt); 994 send_data_packet (pkt);
869 else 995 else
870 { 996 {
871 if (!broadcast)//DDDD
872 data_queue.put (new tap_packet (*pkt)); 997 data_queue.put (new tap_packet (*pkt));
873 998 post_inject_queue ();
874 establish_connection ();
875 } 999 }
876} 1000}
877 1001
1002void
878void connection::inject_vpn_packet (vpn_packet *pkt, int tos) 1003connection::inject_vpn_packet (vpn_packet *pkt, int tos)
879{ 1004{
880 if (ictx && octx) 1005 if (ictx && octx)
881 send_vpn_packet (pkt, si, tos); 1006 send_vpn_packet (pkt, si, tos);
882 else 1007 else
883 { 1008 {
884 vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); 1009 vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
885 1010 post_inject_queue ();
886 establish_connection ();
887 } 1011 }
888} 1012}
889 1013
890void 1014void
891connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) 1015connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
892{ 1016{
893 last_activity = NOW; 1017 last_activity = ev_now ();
894 1018
895 slog (L_NOISE, "<<%d received packet type %d from %d to %d", 1019 slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
896 conf->id, pkt->typ (), pkt->src (), pkt->dst ()); 1020 conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
1021
1022 if (connectmode == conf_node::C_DISABLED)
1023 return;
897 1024
898 switch (pkt->typ ()) 1025 switch (pkt->typ ())
899 { 1026 {
900 case vpn_packet::PT_PING: 1027 case vpn_packet::PT_PING:
1028 slog (L_TRACE, "%s >> PT_PING", conf->nodename);
1029
901 // we send pings instead of auth packets after some retries, 1030 // we send pings instead of auth packets after some retries,
902 // so reset the retry counter and establish a connection 1031 // so reset the retry counter and establish a connection
903 // when we receive a ping. 1032 // when we receive a ping.
904 if (!ictx) 1033 if (!ictx)
905 { 1034 {
906 if (auth_rate_limiter.can (rsi)) 1035 if (auth_rate_limiter.can (rsi))
907 send_auth_request (rsi, true); 1036 send_auth_request (rsi, true);
908 } 1037 }
909 else 1038 else
1039 // we would love to change the socket address here, but ping's aren't
1040 // authenticated, so we best ignore it.
910 send_ping (rsi, 1); // pong 1041 send_ping (rsi, 1); // pong
911 1042
912 break; 1043 break;
913 1044
914 case vpn_packet::PT_PONG: 1045 case vpn_packet::PT_PONG:
1046 slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
1047
1048 // a PONG might mean that the other side doesn't really know
1049 // about our desire for communication.
1050 establish_connection ();
915 break; 1051 break;
916 1052
917 case vpn_packet::PT_RESET: 1053 case vpn_packet::PT_RESET:
918 { 1054 {
919 reset_connection (); 1055 reset_connection ();
920 1056
921 config_packet *p = (config_packet *) pkt; 1057 config_packet *p = (config_packet *) pkt;
922 1058
923 if (!p->chk_config ()) 1059 if (!p->chk_config ())
924 { 1060 {
925 slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"), 1061 slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
926 conf->nodename, (const char *)rsi); 1062 conf->nodename, (const char *)rsi);
927 connectmode = conf_node::C_DISABLED; 1063 connectmode = conf_node::C_DISABLED;
928 } 1064 }
929 else if (connectmode == conf_node::C_ALWAYS) 1065 else if (connectmode == conf_node::C_ALWAYS)
930 establish_connection (); 1066 establish_connection ();
… …
932 break; 1068 break;
933 1069
934 case vpn_packet::PT_AUTH_REQ: 1070 case vpn_packet::PT_AUTH_REQ:
935 if (auth_rate_limiter.can (rsi)) 1071 if (auth_rate_limiter.can (rsi))
936 { 1072 {
937 auth_req_packet *p = (auth_req_packet *) pkt; 1073 auth_req_packet *p = (auth_req_packet *)pkt;
938 1074
939 slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate); 1075 slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
1076 conf->nodename, p->initiate ? "initiate" : "reply",
1077 p->protocols, p->features);
940 1078
941 if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) 1079 if (p->chk_config ()
1080 && (!memcmp (p->magic, MAGIC_OLD, 8) || !memcmp (p->magic, MAGIC, 8)))
942 { 1081 {
943 if (p->prot_minor != PROTOCOL_MINOR) 1082 if (p->prot_minor != PROTOCOL_MINOR)
944 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), 1083 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
945 conf->nodename, (const char *)rsi, 1084 conf->nodename, (const char *)rsi,
946 PROTOCOL_MINOR, conf->nodename, p->prot_minor); 1085 PROTOCOL_MINOR, conf->nodename, p->prot_minor);
… …
961 delete octx; 1100 delete octx;
962 1101
963 octx = new crypto_ctx (k, 1); 1102 octx = new crypto_ctx (k, 1);
964 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; 1103 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;
965 1104
966 // compatibility code, remove when no longer required
967 if (p->flags & 1) p->features |= FEATURE_COMPRESSION;
968
969 conf->protocols = p->protocols; 1105 conf->protocols = p->protocols;
970 features = p->features & config_packet::get_features (); 1106 features = p->features & config_packet::get_features ();
971 1107
972 send_auth_response (rsi, p->id, k); 1108 send_auth_response (rsi, p->id, k);
973 1109
… …
975 1111
976 break; 1112 break;
977 } 1113 }
978 } 1114 }
979 else 1115 else
980 slog (L_WARN, _("%s(%s): protocol mismatch"), 1116 slog (L_WARN, _("%s(%s): protocol mismatch."),
981 conf->nodename, (const char *)rsi); 1117 conf->nodename, (const char *)rsi);
982 1118
983 send_reset (rsi); 1119 send_reset (rsi);
984 } 1120 }
985 1121
986 break; 1122 break;
987 1123
988 case vpn_packet::PT_AUTH_RES: 1124 case vpn_packet::PT_AUTH_RES:
989 { 1125 {
990 auth_res_packet *p = (auth_res_packet *) pkt; 1126 auth_res_packet *p = (auth_res_packet *)pkt;
991 1127
992 slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); 1128 slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
993 1129
994 if (p->chk_config ()) 1130 if (p->chk_config ())
995 { 1131 {
996 if (p->prot_minor != PROTOCOL_MINOR) 1132 if (p->prot_minor != PROTOCOL_MINOR)
997 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), 1133 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
… …
1000 1136
1001 rsachallenge chg; 1137 rsachallenge chg;
1002 1138
1003 if (!rsa_cache.find (p->id, chg)) 1139 if (!rsa_cache.find (p->id, chg))
1004 { 1140 {
1005 slog (L_ERR, _("%s(%s): unrequested auth response ignored"), 1141 slog (L_ERR, _("%s(%s): unrequested auth response, ignoring."),
1006 conf->nodename, (const char *)rsi); 1142 conf->nodename, (const char *)rsi);
1007 break; 1143 break;
1008 } 1144 }
1009 else 1145 else
1010 { 1146 {
1011 crypto_ctx *cctx = new crypto_ctx (chg, 0); 1147 crypto_ctx *cctx = new crypto_ctx (chg, 0);
1012 1148
1013 if (!p->hmac_chk (cctx)) 1149 if (!p->hmac_chk (cctx))
1014 { 1150 {
1015 slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" 1151 slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
1016 "could be an attack, or just corruption or a synchronization error"), 1152 "could be an attack, or just corruption or a synchronization error."),
1017 conf->nodename, (const char *)rsi); 1153 conf->nodename, (const char *)rsi);
1018 break; 1154 break;
1019 } 1155 }
1020 else 1156 else
1021 { 1157 {
… …
1032 iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid 1168 iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1033 1169
1034 si = rsi; 1170 si = rsi;
1035 protocol = rsi.prot; 1171 protocol = rsi.prot;
1036 1172
1173 slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
1174 conf->nodename, (const char *)rsi,
1175 is_direct ? "direct" : "forwarded",
1176 p->prot_major, p->prot_minor);
1177
1037 connection_established (); 1178 connection_established ();
1038 1179
1039 slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1040 conf->nodename, (const char *)rsi,
1041 p->prot_major, p->prot_minor);
1042
1043 if (::conf.script_node_up) 1180 if (::conf.script_node_up)
1044 run_script (run_script_cb (this, &connection::script_node_up), false); 1181 {
1182 run_script_cb *cb = new run_script_cb;
1183 cb->set<connection, &connection::script_node_up> (this);
1184 run_script_queued (cb, _("node-up command execution failed, continuing."));
1185 }
1045 1186
1046 break; 1187 break;
1047 } 1188 }
1048 else 1189 else
1049 slog (L_ERR, _("%s(%s): sent and received challenge do not match"), 1190 slog (L_ERR, _("%s(%s): sent and received challenge do not match."),
1050 conf->nodename, (const char *)rsi); 1191 conf->nodename, (const char *)rsi);
1051 } 1192 }
1052 1193
1053 delete cctx; 1194 delete cctx;
1054 } 1195 }
… …
1070 { 1211 {
1071 vpndata_packet *p = (vpndata_packet *)pkt; 1212 vpndata_packet *p = (vpndata_packet *)pkt;
1072 1213
1073 if (!p->hmac_chk (ictx)) 1214 if (!p->hmac_chk (ictx))
1074 slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" 1215 slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1075 "could be an attack, or just corruption or a synchronization error"), 1216 "could be an attack, or just corruption or a synchronization error."),
1076 conf->nodename, (const char *)rsi); 1217 conf->nodename, (const char *)rsi);
1077 else 1218 else
1078 { 1219 {
1079 u32 seqno; 1220 u32 seqno;
1080 tap_packet *d = p->unpack (this, seqno); 1221 tap_packet *d = p->unpack (this, seqno);
1222 int seqclass = iseqno.seqno_classify (seqno);
1081 1223
1082 if (iseqno.recv_ok (seqno)) 1224 if (seqclass == 0) // ok
1083 { 1225 {
1084 vpn->tap->send (d); 1226 vpn->tap->send (d);
1085 1227
1086 if (si != rsi) 1228 if (si != rsi)
1087 { 1229 {
1088 // fast re-sync on connection changes, useful especially for tcp/ip 1230 // fast re-sync on source address changes, useful especially for tcp/ip
1231 //if (last_si_change < ev_now () + 5.)
1089 si = rsi; 1232 // {
1090
1091 slog (L_INFO, _("%s(%s): socket address changed to %s"), 1233 slog (L_INFO, _("%s(%s): changing socket address to %s."),
1092 conf->nodename, (const char *)si, (const char *)rsi); 1234 conf->nodename, (const char *)si, (const char *)rsi);
1235
1236 si = rsi;
1237
1238 if (::conf.script_node_change)
1239 {
1240 run_script_cb *cb = new run_script_cb;
1241 cb->set<connection, &connection::script_node_change> (this);
1242 run_script_queued (cb, _("node-change command execution failed, continuing."));
1243 }
1244
1245 // }
1246 //else
1247 // slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
1248 // conf->nodename, (const char *)si, (const char *)rsi);
1093 } 1249 }
1250 }
1251 else if (seqclass == 1) // far history
1252 slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
1253 "possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
1254 else if (seqclass == 2) // in-window duplicate, happens often on wireless
1255 slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
1256 "possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
1257 else if (seqclass == 3) // reset
1258 {
1259 slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
1260 "probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
1261 send_reset (rsi);
1094 } 1262 }
1095 1263
1096 delete d; 1264 delete d;
1097 break; 1265 break;
1098 } 1266 }
… …
1102 break; 1270 break;
1103 1271
1104 case vpn_packet::PT_CONNECT_REQ: 1272 case vpn_packet::PT_CONNECT_REQ:
1105 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) 1273 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1106 { 1274 {
1107 connect_req_packet *p = (connect_req_packet *) pkt; 1275 connect_req_packet *p = (connect_req_packet *)pkt;
1108 1276
1109 assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything 1277 if (p->id > 0 && p->id <= vpn->conns.size ())
1110 connection *c = vpn->conns[p->id - 1];
1111 conf->protocols = p->protocols;
1112
1113 slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1114 conf->id, p->id, c->ictx && c->octx);
1115
1116 if (c->ictx && c->octx)
1117 { 1278 {
1279 connection *c = vpn->conns[p->id - 1];
1280 conf->protocols = p->protocols;
1281
1282 slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
1283 conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
1284 p->protocols,
1285 c->ictx && c->octx);
1286
1287 if (c->ictx && c->octx)
1288 {
1118 // send connect_info packets to both sides, in case one is 1289 // send connect_info packets to both sides, in case one is
1119 // behind a nat firewall (or both ;) 1290 // behind a nat firewall (or both ;)
1120 c->send_connect_info (conf->id, si, conf->protocols); 1291 c->send_connect_info (conf->id, si, conf->protocols);
1121 send_connect_info (c->conf->id, c->si, c->conf->protocols); 1292 send_connect_info (c->conf->id, c->si, c->conf->protocols);
1293 }
1294 else
1295 c->establish_connection ();
1122 } 1296 }
1123 else 1297 else
1124 c->establish_connection (); 1298 slog (L_WARN,
1299 _("received authenticated connection request from unknown node #%d, config file mismatch?"),
1300 p->id);
1125 } 1301 }
1126 1302
1127 break; 1303 break;
1128 1304
1129 case vpn_packet::PT_CONNECT_INFO: 1305 case vpn_packet::PT_CONNECT_INFO:
1130 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) 1306 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1131 { 1307 {
1132 connect_info_packet *p = (connect_info_packet *)pkt; 1308 connect_info_packet *p = (connect_info_packet *)pkt;
1133 1309
1134 if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything 1310 if (p->id > 0 && p->id <= vpn->conns.size ())
1135 { 1311 {
1136 connection *c = vpn->conns[p->id - 1]; 1312 connection *c = vpn->conns[p->id - 1];
1137 1313
1138 c->conf->protocols = p->protocols; 1314 c->conf->protocols = p->protocols;
1139 protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); 1315 protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1140 p->si.upgrade_protocol (protocol, c->conf); 1316 p->si.upgrade_protocol (protocol, c->conf);
1141 1317
1142 slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", 1318 slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,p%02x) [%d]",
1143 conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); 1319 conf->nodename,
1320 vpn->conns[p->id - 1]->conf->nodename,
1321 (const char *)p->si,
1322 p->protocols,
1323 !c->ictx && !c->octx);
1144 1324
1145 const sockinfo &dsi = forward_si (p->si); 1325 const sockinfo &dsi = forward_si (p->si);
1146 1326
1147 if (dsi.valid ()) 1327 if (dsi.valid ())
1148 c->send_auth_request (dsi, true); 1328 c->send_auth_request (dsi, true);
1149 } 1329 }
1330 else
1331 slog (L_WARN,
1332 _("received authenticated connection request from unknown node #%d, config file mismatch?"),
1333 p->id);
1150 } 1334 }
1151 1335
1152 break; 1336 break;
1153 1337
1154 default: 1338 default:
1155 send_reset (rsi); 1339 send_reset (rsi);
1156 break; 1340 break;
1157 } 1341 }
1158} 1342}
1159 1343
1160void connection::keepalive_cb (time_watcher &w) 1344inline void
1345connection::keepalive_cb (ev::timer &w, int revents)
1161{ 1346{
1162 if (NOW >= last_activity + ::conf.keepalive + 30) 1347 if (ev_now () >= last_activity + ::conf.keepalive + 15)
1163 { 1348 {
1164 reset_connection (); 1349 reset_connection ();
1165 establish_connection (); 1350 establish_connection ();
1166 } 1351 }
1167 else if (NOW < last_activity + ::conf.keepalive) 1352 else if (ev_now () < last_activity + ::conf.keepalive)
1168 w.start (last_activity + ::conf.keepalive); 1353 w.start (last_activity + ::conf.keepalive - ev::now ());
1169 else if (conf->connectmode != conf_node::C_ONDEMAND 1354 else if (conf->connectmode != conf_node::C_ONDEMAND
1170 || THISNODE->connectmode != conf_node::C_ONDEMAND) 1355 || THISNODE->connectmode != conf_node::C_ONDEMAND)
1171 { 1356 {
1172 send_ping (si); 1357 send_ping (si);
1173 w.start (NOW + 5); 1358 w.start (3);
1174 } 1359 }
1175 else if (NOW < last_activity + ::conf.keepalive + 10) 1360 else if (ev_now () < last_activity + ::conf.keepalive + 10)
1176 // hold ondemand connections implicitly a few seconds longer 1361 // hold ondemand connections implicitly a few seconds longer
1177 // should delete octx, though, or something like that ;) 1362 // should delete octx, though, or something like that ;)
1178 w.start (last_activity + ::conf.keepalive + 10); 1363 w.start (last_activity + ::conf.keepalive + 10 - ev::now ());
1179 else 1364 else
1180 reset_connection (); 1365 reset_connection ();
1181} 1366}
1182 1367
1368void
1183void connection::send_connect_request (int id) 1369connection::send_connect_request (int id)
1184{ 1370{
1185 connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); 1371 connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1186 1372
1187 slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); 1373 slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
1374 conf->nodename, vpn->conns[id - 1]->conf->nodename,
1375 THISNODE->protocols);
1188 p->hmac_set (octx); 1376 p->hmac_set (octx);
1189 send_vpn_packet (p, si); 1377 send_vpn_packet (p, si);
1190 1378
1191 delete p; 1379 delete p;
1192} 1380}
1193 1381
1194void connection::script_node () 1382void
1383connection::script_init_env (const char *ext)
1195{ 1384{
1196 vpn->script_if_up ();
1197
1198 char *env; 1385 char *env;
1386 asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1387 asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1388 asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1389 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1390 conf->id & 0xff); putenv (env);
1391}
1392
1393void
1394connection::script_init_connect_env ()
1395{
1396 vpn->script_init_env ();
1397
1398 char *env;
1199 asprintf (&env, "DESTID=%d", conf->id); putenv (env); 1399 asprintf (&env, "DESTID=%d", conf->id); putenv (env);
1400 asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1200 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); 1401 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1201 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); 1402 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1202 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); 1403 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1203} 1404}
1204 1405
1406inline const char *
1205const char *connection::script_node_up () 1407connection::script_node_up ()
1206{ 1408{
1207 script_node (); 1409 script_init_connect_env ();
1208 1410
1209 putenv ("STATE=up"); 1411 putenv ((char *)"STATE=up");
1210 1412
1413 char *filename;
1414 asprintf (&filename,
1415 "%s/%s",
1416 confbase,
1211 return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; 1417 ::conf.script_node_up ? ::conf.script_node_up : "node-up");
1212}
1213 1418
1419 return filename;
1420}
1421
1422inline const char *
1423connection::script_node_change ()
1424{
1425 script_init_connect_env ();
1426
1427 putenv ((char *)"STATE=change");
1428
1429 char *filename;
1430 asprintf (&filename,
1431 "%s/%s",
1432 confbase,
1433 ::conf.script_node_change ? ::conf.script_node_change : "node-change");
1434
1435 return filename;
1436}
1437
1438inline const char *
1214const char *connection::script_node_down () 1439connection::script_node_down ()
1215{ 1440{
1216 script_node (); 1441 script_init_connect_env ();
1217 1442
1218 putenv ("STATE=down"); 1443 putenv ((char *)"STATE=down");
1219 1444
1220 return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; 1445 char *filename;
1446 asprintf (&filename,
1447 "%s/%s",
1448 confbase,
1449 ::conf.script_node_down ? ::conf.script_node_down : "node-down");
1450
1451 return filename;
1221} 1452}
1222 1453
1223connection::connection (struct vpn *vpn, conf_node *conf) 1454connection::connection (struct vpn *vpn, conf_node *conf)
1224: vpn(vpn), conf(conf) 1455: vpn(vpn), conf(conf),
1225, rekey (this, &connection::rekey_cb)
1226, keepalive (this, &connection::keepalive_cb)
1227, establish_connection (this, &connection::establish_connection_cb)
1228#if ENABLE_DNS 1456#if ENABLE_DNS
1229, dns (0) 1457 dns (0),
1230#endif 1458#endif
1459 data_queue(conf->max_ttl, conf->max_queue + 1),
1460 vpn_queue(conf->max_ttl, conf->max_queue + 1)
1231{ 1461{
1462 rekey .set<connection, &connection::rekey_cb > (this);
1463 keepalive .set<connection, &connection::keepalive_cb > (this);
1464 establish_connection.set<connection, &connection::establish_connection_cb> (this);
1465
1466 last_establish_attempt = 0.;
1232 octx = ictx = 0; 1467 octx = ictx = 0;
1233 retry_cnt = 0;
1234 1468
1235 if (!conf->protocols) // make sure some protocol is enabled 1469 connectmode = conf->connectmode;
1236 conf->protocols = PROT_UDPv4;
1237 1470
1238 connectmode = conf_node::C_ALWAYS; // initial setting 1471 // queue a dummy packet to force an initial connection attempt
1472 if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
1473 vpn_queue.put (new net_packet);
1474
1239 reset_connection (); 1475 reset_connection ();
1240} 1476}
1241 1477
1242connection::~connection () 1478connection::~connection ()
1243{ 1479{
1244 shutdown (); 1480 shutdown ();
1245} 1481}
1246 1482
1483void
1247void connection_init () 1484connection_init ()
1248{ 1485{
1249 auth_rate_limiter.clear (); 1486 auth_rate_limiter.clear ();
1250 reset_rate_limiter.clear (); 1487 reset_rate_limiter.clear ();
1251} 1488}
1252 1489

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