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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 1.97 by root, Tue Dec 4 13:23:17 2012 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"
54 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//////////////////////////////////////////////////////////////////////////////
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;
59 112
… …
79rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) 132rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)
80{ 133{
81 EVP_MD_CTX ctx; 134 EVP_MD_CTX ctx;
82 135
83 EVP_MD_CTX_init (&ctx); 136 EVP_MD_CTX_init (&ctx);
84 require (EVP_DigestInit (&ctx, RSA_HASH)); 137 require (EVP_DigestInit (&ctx, RSA_HASH));
85 require (EVP_DigestUpdate(&ctx, &chg, sizeof chg)); 138 require (EVP_DigestUpdate (&ctx, &chg, sizeof chg));
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);
697
599 keepalive.start (NOW + ::conf.keepalive); 698 keepalive.start (::conf.keepalive);
600 699
601 // send queued packets 700 // send queued packets
602 if (ictx && octx) 701 if (ictx && octx)
603 { 702 {
604 while (tap_packet *p = (tap_packet *)data_queue.get ()) 703 while (tap_packet *p = (tap_packet *)data_queue.get ())
605 { 704 {
606 send_data_packet (p); 705 if (p->len) send_data_packet (p);
607 delete p; 706 delete p;
608 } 707 }
609 708
610 while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) 709 while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
611 { 710 {
612 send_vpn_packet (p, si, IPTOS_RELIABILITY); 711 if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
613 delete p; 712 delete p;
614 } 713 }
615 } 714 }
715
716 vpn->connection_established (this);
616 } 717 }
617 else 718 else
618 { 719 {
619 retry_cnt = 0; 720 retry_cnt = 0;
620 establish_connection.start (NOW + 5); 721 establish_connection.start (5);
621 keepalive.stop (); 722 keepalive.stop ();
622 rekey.stop (); 723 rekey.stop ();
623 } 724 }
624} 725}
625 726
626void 727void
627connection::reset_si () 728connection::reset_si ()
628{ 729{
730 if (vpn->can_direct (THISNODE, conf))
629 protocol = best_protocol (THISNODE->protocols & conf->protocols); 731 protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
630 732 else
631 // mask out protocols we cannot establish 733 {
632 if (!conf->udp_port) protocol &= ~PROT_UDPv4; 734 slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
633 if (!conf->tcp_port) protocol &= ~PROT_TCPv4; 735 protocol = 0;
634 if (!conf->dns_port) protocol &= ~PROT_DNSv4; 736 }
635 737
636 si.set (conf, protocol); 738 si.set (conf, protocol);
739
740 is_direct = si.valid ();
637} 741}
638 742
639// ensure sockinfo is valid, forward if necessary 743// ensure sockinfo is valid, forward if necessary
640const sockinfo & 744const sockinfo &
641connection::forward_si (const sockinfo &si) const 745connection::forward_si (const sockinfo &si) const
642{ 746{
643 if (!si.valid ()) 747 if (!si.valid ())
644 { 748 {
645 connection *r = vpn->find_router (); 749 connection *r = vpn->find_router_for (this);
646 750
647 if (r) 751 if (r)
648 { 752 {
649 slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"), 753 slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
650 conf->nodename, r->conf->nodename); 754 conf->nodename, r->conf->nodename);
651 return r->si; 755 return r->si;
652 } 756 }
653 else 757 else
654 slog (L_DEBUG, _("%s: node unreachable, no common protocol"), 758 slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
655 conf->nodename); 759 conf->nodename);
656 } 760 }
657 761
658 return si; 762 return si;
659} 763}
660 764
661void 765void
662connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) 766connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
663{ 767{
664 bool ok; 768 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 (); 769 reset_connection ();
692} 770}
693 771
694void 772void
695connection::send_ping (const sockinfo &si, u8 pong) 773connection::send_ping (const sockinfo &si, u8 pong)
696{ 774{
697 ping_packet *pkt = new ping_packet; 775 ping_packet *pkt = new ping_packet;
698 776
699 pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); 777 pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
778
779 slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
780
700 send_vpn_packet (pkt, si, IPTOS_LOWDELAY); 781 send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
701 782
702 delete pkt; 783 delete pkt;
703} 784}
704 785
… …
723 804
724 rsachallenge chg; 805 rsachallenge chg;
725 rsa_cache.gen (pkt->id, chg); 806 rsa_cache.gen (pkt->id, chg);
726 rsa_encrypt (conf->rsa_key, chg, pkt->encr); 807 rsa_encrypt (conf->rsa_key, chg, pkt->encr);
727 808
728 slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); 809 slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
729 810
730 send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly 811 send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
731 812
732 delete pkt; 813 delete pkt;
733} 814}
… …
741 822
742 rsa_hash (id, chg, pkt->response); 823 rsa_hash (id, chg, pkt->response);
743 824
744 pkt->hmac_set (octx); 825 pkt->hmac_set (octx);
745 826
746 slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si); 827 slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
747 828
748 send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly 829 send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
749 830
750 delete pkt; 831 delete pkt;
751} 832}
752 833
753void 834void
754connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) 835connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
755{ 836{
756 slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", 837 slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
757 conf->id, rid, (const char *)rsi); 838 vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
839 conf->protocols);
758 840
759 connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); 841 connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
760 842
761 r->hmac_set (octx); 843 r->hmac_set (octx);
762 send_vpn_packet (r, si); 844 send_vpn_packet (r, si);
763 845
764 delete r; 846 delete r;
765} 847}
766 848
767void 849inline void
768connection::establish_connection_cb (time_watcher &w) 850connection::establish_connection_cb (ev::timer &w, int revents)
769{ 851{
770 if (!ictx 852 if (!(ictx && octx)
771 && conf != THISNODE 853 && conf != THISNODE
772 && connectmode != conf_node::C_NEVER 854 && connectmode != conf_node::C_NEVER
773 && connectmode != conf_node::C_DISABLED 855 && connectmode != conf_node::C_DISABLED
774 && NOW > w.at) 856 && !w.is_active ())
775 { 857 {
776 double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; 858 // a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
777 859 // and stop trying. should probably be handled by a per-connection expire handler.
778 if (retry_int < conf->max_retry) 860 if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
861 {
862 reset_connection ();
779 retry_cnt++; 863 return;
780 else 864 }
781 retry_int = conf->max_retry;
782 865
783 w.start (NOW + retry_int); 866 last_establish_attempt = ev_now ();
867
868 ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
869 ? (retry_cnt & 3) + 1
870 : 1 << (retry_cnt >> 2));
784 871
785 reset_si (); 872 reset_si ();
786 873
787 if (si.prot && !si.host) 874 bool slow = si.prot & PROT_SLOW;
875
876 if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
877 {
878 /*TODO*/ /* start the timer so we don't recurse endlessly */
879 w.start (1);
788 vpn->send_connect_request (conf->id); 880 vpn->send_connect_request (this);
881 }
789 else 882 else
790 { 883 {
884 if (si.valid ())
885 slog (L_DEBUG, _("%s: sending direct connection request to %s."),
886 conf->nodename, (const char *)si);
887
791 const sockinfo &dsi = forward_si (si); 888 const sockinfo &dsi = forward_si (si);
889
890 slow = slow || (dsi.prot & PROT_SLOW);
792 891
793 if (dsi.valid () && auth_rate_limiter.can (dsi)) 892 if (dsi.valid () && auth_rate_limiter.can (dsi))
794 { 893 {
795 if (retry_cnt < 4) 894 if (retry_cnt < 4)
796 send_auth_request (dsi, true); 895 send_auth_request (dsi, true);
797 else 896 else
798 send_ping (dsi, 0); 897 send_ping (dsi, 0);
799 } 898 }
800 } 899 }
900
901 retry_int *= slow ? 8. : 0.9;
902
903 if (retry_int < conf->max_retry)
904 retry_cnt++;
905 else
906 retry_int = conf->max_retry;
907
908 w.start (retry_int);
801 } 909 }
802} 910}
803 911
804void 912void
805connection::reset_connection () 913connection::reset_connection ()
… …
808 { 916 {
809 slog (L_INFO, _("%s(%s): connection lost"), 917 slog (L_INFO, _("%s(%s): connection lost"),
810 conf->nodename, (const char *)si); 918 conf->nodename, (const char *)si);
811 919
812 if (::conf.script_node_down) 920 if (::conf.script_node_down)
813 run_script (run_script_cb (this, &connection::script_node_down), false); 921 {
922 run_script_cb *cb = new run_script_cb;
923 cb->set<connection, &connection::script_node_down> (this);
924 run_script_queued (cb, _("node-down command execution failed, continuing."));
925 }
814 } 926 }
815 927
816 delete ictx; ictx = 0; 928 delete ictx; ictx = 0;
817 delete octx; octx = 0; 929 delete octx; octx = 0;
818 930
819 si.host = 0; 931 si.host = 0;
820 932
821 last_activity = 0; 933 last_activity = 0.;
934 //last_si_change = 0.;
822 retry_cnt = 0; 935 retry_cnt = 0;
823 936
824 rekey.stop (); 937 rekey.stop ();
825 keepalive.stop (); 938 keepalive.stop ();
826 establish_connection.stop (); 939 establish_connection.stop ();
… …
833 send_reset (si); 946 send_reset (si);
834 947
835 reset_connection (); 948 reset_connection ();
836} 949}
837 950
838void 951// poor-man's rekeying
839connection::rekey_cb (time_watcher &w) 952inline void
953connection::rekey_cb (ev::timer &w, int revents)
840{ 954{
841 reset_connection (); 955 reset_connection ();
842 establish_connection (); 956 establish_connection ();
843} 957}
844 958
… …
860 if (oseqno > MAX_SEQNO) 974 if (oseqno > MAX_SEQNO)
861 rekey (); 975 rekey ();
862} 976}
863 977
864void 978void
979connection::post_inject_queue ()
980{
981 // force a connection every now and when when packets are sent (max 1/s)
982 if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
983 establish_connection.stop ();
984
985 establish_connection ();
986}
987
988void
865connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) 989connection::inject_data_packet (tap_packet *pkt)
866{ 990{
867 if (ictx && octx) 991 if (ictx && octx)
868 send_data_packet (pkt); 992 send_data_packet (pkt);
869 else 993 else
870 { 994 {
871 if (!broadcast)//DDDD
872 data_queue.put (new tap_packet (*pkt)); 995 data_queue.put (new tap_packet (*pkt));
873 996 post_inject_queue ();
874 establish_connection ();
875 } 997 }
876} 998}
877 999
1000void
878void connection::inject_vpn_packet (vpn_packet *pkt, int tos) 1001connection::inject_vpn_packet (vpn_packet *pkt, int tos)
879{ 1002{
880 if (ictx && octx) 1003 if (ictx && octx)
881 send_vpn_packet (pkt, si, tos); 1004 send_vpn_packet (pkt, si, tos);
882 else 1005 else
883 { 1006 {
884 vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); 1007 vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
885 1008 post_inject_queue ();
886 establish_connection ();
887 } 1009 }
888} 1010}
889 1011
890void 1012void
891connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) 1013connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
892{ 1014{
893 last_activity = NOW; 1015 last_activity = ev_now ();
894 1016
895 slog (L_NOISE, "<<%d received packet type %d from %d to %d", 1017 slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
896 conf->id, pkt->typ (), pkt->src (), pkt->dst ()); 1018 conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
1019
1020 if (connectmode == conf_node::C_DISABLED)
1021 return;
897 1022
898 switch (pkt->typ ()) 1023 switch (pkt->typ ())
899 { 1024 {
900 case vpn_packet::PT_PING: 1025 case vpn_packet::PT_PING:
1026 slog (L_TRACE, "%s >> PT_PING", conf->nodename);
1027
901 // we send pings instead of auth packets after some retries, 1028 // we send pings instead of auth packets after some retries,
902 // so reset the retry counter and establish a connection 1029 // so reset the retry counter and establish a connection
903 // when we receive a ping. 1030 // when we receive a ping.
904 if (!ictx) 1031 if (!ictx)
905 { 1032 {
906 if (auth_rate_limiter.can (rsi)) 1033 if (auth_rate_limiter.can (rsi))
907 send_auth_request (rsi, true); 1034 send_auth_request (rsi, true);
908 } 1035 }
909 else 1036 else
1037 // we would love to change the socket address here, but ping's aren't
1038 // authenticated, so we best ignore it.
910 send_ping (rsi, 1); // pong 1039 send_ping (rsi, 1); // pong
911 1040
912 break; 1041 break;
913 1042
914 case vpn_packet::PT_PONG: 1043 case vpn_packet::PT_PONG:
1044 slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
1045
1046 // a PONG might mean that the other side doesn't really know
1047 // about our desire for communication.
1048 establish_connection ();
915 break; 1049 break;
916 1050
917 case vpn_packet::PT_RESET: 1051 case vpn_packet::PT_RESET:
918 { 1052 {
919 reset_connection (); 1053 reset_connection ();
920 1054
921 config_packet *p = (config_packet *) pkt; 1055 config_packet *p = (config_packet *) pkt;
922 1056
923 if (!p->chk_config ()) 1057 if (!p->chk_config ())
924 { 1058 {
925 slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"), 1059 slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
926 conf->nodename, (const char *)rsi); 1060 conf->nodename, (const char *)rsi);
927 connectmode = conf_node::C_DISABLED; 1061 connectmode = conf_node::C_DISABLED;
928 } 1062 }
929 else if (connectmode == conf_node::C_ALWAYS) 1063 else if (connectmode == conf_node::C_ALWAYS)
930 establish_connection (); 1064 establish_connection ();
… …
932 break; 1066 break;
933 1067
934 case vpn_packet::PT_AUTH_REQ: 1068 case vpn_packet::PT_AUTH_REQ:
935 if (auth_rate_limiter.can (rsi)) 1069 if (auth_rate_limiter.can (rsi))
936 { 1070 {
937 auth_req_packet *p = (auth_req_packet *) pkt; 1071 auth_req_packet *p = (auth_req_packet *)pkt;
938 1072
939 slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate); 1073 slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
1074 conf->nodename, p->initiate ? "initiate" : "reply",
1075 p->protocols, p->features);
940 1076
941 if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) 1077 if (p->chk_config ()
1078 && (!memcmp (p->magic, MAGIC_OLD, 8) || !memcmp (p->magic, MAGIC, 8)))
942 { 1079 {
943 if (p->prot_minor != PROTOCOL_MINOR) 1080 if (p->prot_minor != PROTOCOL_MINOR)
944 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), 1081 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
945 conf->nodename, (const char *)rsi, 1082 conf->nodename, (const char *)rsi,
946 PROTOCOL_MINOR, conf->nodename, p->prot_minor); 1083 PROTOCOL_MINOR, conf->nodename, p->prot_minor);
… …
961 delete octx; 1098 delete octx;
962 1099
963 octx = new crypto_ctx (k, 1); 1100 octx = new crypto_ctx (k, 1);
964 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; 1101 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;
965 1102
966 // compatibility code, remove when no longer required
967 if (p->flags & 1) p->features |= FEATURE_COMPRESSION;
968
969 conf->protocols = p->protocols; 1103 conf->protocols = p->protocols;
970 features = p->features & config_packet::get_features (); 1104 features = p->features & config_packet::get_features ();
971 1105
972 send_auth_response (rsi, p->id, k); 1106 send_auth_response (rsi, p->id, k);
973 1107
… …
975 1109
976 break; 1110 break;
977 } 1111 }
978 } 1112 }
979 else 1113 else
980 slog (L_WARN, _("%s(%s): protocol mismatch"), 1114 slog (L_WARN, _("%s(%s): protocol mismatch."),
981 conf->nodename, (const char *)rsi); 1115 conf->nodename, (const char *)rsi);
982 1116
983 send_reset (rsi); 1117 send_reset (rsi);
984 } 1118 }
985 1119
986 break; 1120 break;
987 1121
988 case vpn_packet::PT_AUTH_RES: 1122 case vpn_packet::PT_AUTH_RES:
989 { 1123 {
990 auth_res_packet *p = (auth_res_packet *) pkt; 1124 auth_res_packet *p = (auth_res_packet *)pkt;
991 1125
992 slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); 1126 slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
993 1127
994 if (p->chk_config ()) 1128 if (p->chk_config ())
995 { 1129 {
996 if (p->prot_minor != PROTOCOL_MINOR) 1130 if (p->prot_minor != PROTOCOL_MINOR)
997 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), 1131 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
… …
1000 1134
1001 rsachallenge chg; 1135 rsachallenge chg;
1002 1136
1003 if (!rsa_cache.find (p->id, chg)) 1137 if (!rsa_cache.find (p->id, chg))
1004 { 1138 {
1005 slog (L_ERR, _("%s(%s): unrequested auth response ignored"), 1139 slog (L_ERR, _("%s(%s): unrequested auth response, ignoring."),
1006 conf->nodename, (const char *)rsi); 1140 conf->nodename, (const char *)rsi);
1007 break; 1141 break;
1008 } 1142 }
1009 else 1143 else
1010 { 1144 {
1011 crypto_ctx *cctx = new crypto_ctx (chg, 0); 1145 crypto_ctx *cctx = new crypto_ctx (chg, 0);
1012 1146
1013 if (!p->hmac_chk (cctx)) 1147 if (!p->hmac_chk (cctx))
1014 { 1148 {
1015 slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" 1149 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"), 1150 "could be an attack, or just corruption or a synchronization error."),
1017 conf->nodename, (const char *)rsi); 1151 conf->nodename, (const char *)rsi);
1018 break; 1152 break;
1019 } 1153 }
1020 else 1154 else
1021 { 1155 {
… …
1032 iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid 1166 iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1033 1167
1034 si = rsi; 1168 si = rsi;
1035 protocol = rsi.prot; 1169 protocol = rsi.prot;
1036 1170
1171 slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
1172 conf->nodename, (const char *)rsi,
1173 is_direct ? "direct" : "forwarded",
1174 p->prot_major, p->prot_minor);
1175
1037 connection_established (); 1176 connection_established ();
1038 1177
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) 1178 if (::conf.script_node_up)
1044 run_script (run_script_cb (this, &connection::script_node_up), false); 1179 {
1180 run_script_cb *cb = new run_script_cb;
1181 cb->set<connection, &connection::script_node_up> (this);
1182 run_script_queued (cb, _("node-up command execution failed, continuing."));
1183 }
1045 1184
1046 break; 1185 break;
1047 } 1186 }
1048 else 1187 else
1049 slog (L_ERR, _("%s(%s): sent and received challenge do not match"), 1188 slog (L_ERR, _("%s(%s): sent and received challenge do not match."),
1050 conf->nodename, (const char *)rsi); 1189 conf->nodename, (const char *)rsi);
1051 } 1190 }
1052 1191
1053 delete cctx; 1192 delete cctx;
1054 } 1193 }
… …
1070 { 1209 {
1071 vpndata_packet *p = (vpndata_packet *)pkt; 1210 vpndata_packet *p = (vpndata_packet *)pkt;
1072 1211
1073 if (!p->hmac_chk (ictx)) 1212 if (!p->hmac_chk (ictx))
1074 slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" 1213 slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1075 "could be an attack, or just corruption or a synchronization error"), 1214 "could be an attack, or just corruption or a synchronization error."),
1076 conf->nodename, (const char *)rsi); 1215 conf->nodename, (const char *)rsi);
1077 else 1216 else
1078 { 1217 {
1079 u32 seqno; 1218 u32 seqno;
1080 tap_packet *d = p->unpack (this, seqno); 1219 tap_packet *d = p->unpack (this, seqno);
1220 int seqclass = iseqno.seqno_classify (seqno);
1081 1221
1082 if (iseqno.recv_ok (seqno)) 1222 if (seqclass == 0) // ok
1083 { 1223 {
1084 vpn->tap->send (d); 1224 vpn->tap->send (d);
1085 1225
1086 if (si != rsi) 1226 if (si != rsi)
1087 { 1227 {
1088 // fast re-sync on connection changes, useful especially for tcp/ip 1228 // fast re-sync on source address changes, useful especially for tcp/ip
1229 //if (last_si_change < ev_now () + 5.)
1089 si = rsi; 1230 // {
1090
1091 slog (L_INFO, _("%s(%s): socket address changed to %s"), 1231 slog (L_INFO, _("%s(%s): changing socket address to %s."),
1092 conf->nodename, (const char *)si, (const char *)rsi); 1232 conf->nodename, (const char *)si, (const char *)rsi);
1233
1234 si = rsi;
1235
1236 if (::conf.script_node_change)
1237 {
1238 run_script_cb *cb = new run_script_cb;
1239 cb->set<connection, &connection::script_node_change> (this);
1240 run_script_queued (cb, _("node-change command execution failed, continuing."));
1241 }
1242
1243 // }
1244 //else
1245 // slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
1246 // conf->nodename, (const char *)si, (const char *)rsi);
1093 } 1247 }
1248 }
1249 else if (seqclass == 1) // far history
1250 slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
1251 "possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
1252 else if (seqclass == 2) // in-window duplicate, happens often on wireless
1253 slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
1254 "possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
1255 else if (seqclass == 3) // reset
1256 {
1257 slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
1258 "probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
1259 send_reset (rsi);
1094 } 1260 }
1095 1261
1096 delete d; 1262 delete d;
1097 break; 1263 break;
1098 } 1264 }
… …
1102 break; 1268 break;
1103 1269
1104 case vpn_packet::PT_CONNECT_REQ: 1270 case vpn_packet::PT_CONNECT_REQ:
1105 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) 1271 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1106 { 1272 {
1107 connect_req_packet *p = (connect_req_packet *) pkt; 1273 connect_req_packet *p = (connect_req_packet *)pkt;
1108 1274
1109 assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything 1275 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 { 1276 {
1277 connection *c = vpn->conns[p->id - 1];
1278 conf->protocols = p->protocols;
1279
1280 slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
1281 conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
1282 p->protocols,
1283 c->ictx && c->octx);
1284
1285 if (c->ictx && c->octx)
1286 {
1118 // send connect_info packets to both sides, in case one is 1287 // send connect_info packets to both sides, in case one is
1119 // behind a nat firewall (or both ;) 1288 // behind a nat firewall (or both ;)
1120 c->send_connect_info (conf->id, si, conf->protocols); 1289 c->send_connect_info (conf->id, si, conf->protocols);
1121 send_connect_info (c->conf->id, c->si, c->conf->protocols); 1290 send_connect_info (c->conf->id, c->si, c->conf->protocols);
1291 }
1292 else
1293 c->establish_connection ();
1122 } 1294 }
1123 else 1295 else
1124 c->establish_connection (); 1296 slog (L_WARN,
1297 _("received authenticated connection request from unknown node #%d, config file mismatch?"),
1298 p->id);
1125 } 1299 }
1126 1300
1127 break; 1301 break;
1128 1302
1129 case vpn_packet::PT_CONNECT_INFO: 1303 case vpn_packet::PT_CONNECT_INFO:
1130 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) 1304 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1131 { 1305 {
1132 connect_info_packet *p = (connect_info_packet *)pkt; 1306 connect_info_packet *p = (connect_info_packet *)pkt;
1133 1307
1134 if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything 1308 if (p->id > 0 && p->id <= vpn->conns.size ())
1135 { 1309 {
1136 connection *c = vpn->conns[p->id - 1]; 1310 connection *c = vpn->conns[p->id - 1];
1137 1311
1138 c->conf->protocols = p->protocols; 1312 c->conf->protocols = p->protocols;
1139 protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); 1313 protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1140 p->si.upgrade_protocol (protocol, c->conf); 1314 p->si.upgrade_protocol (protocol, c->conf);
1141 1315
1142 slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", 1316 slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1143 conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); 1317 conf->nodename,
1318 vpn->conns[p->id - 1]->conf->nodename,
1319 (const char *)p->si,
1320 p->protocols,
1321 protocol,
1322 p->si.supported_protocols (c->conf),
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);
1329 else
1330 slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
1331 vpn->conns[p->id - 1]->conf->nodename,
1332 (const char *)p->si);
1149 } 1333 }
1334 else
1335 slog (L_WARN,
1336 _("received authenticated connection request from unknown node #%d, config file mismatch?"),
1337 p->id);
1150 } 1338 }
1151 1339
1152 break; 1340 break;
1153 1341
1154 default: 1342 default:
1155 send_reset (rsi); 1343 send_reset (rsi);
1156 break; 1344 break;
1157 } 1345 }
1158} 1346}
1159 1347
1160void connection::keepalive_cb (time_watcher &w) 1348inline void
1349connection::keepalive_cb (ev::timer &w, int revents)
1161{ 1350{
1162 if (NOW >= last_activity + ::conf.keepalive + 30) 1351 ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
1352
1353 if (when >= 0)
1354 w.start (when);
1355 else if (when < -15)
1163 { 1356 {
1164 reset_connection (); 1357 reset_connection ();
1165 establish_connection (); 1358 establish_connection ();
1166 } 1359 }
1167 else if (NOW < last_activity + ::conf.keepalive)
1168 w.start (last_activity + ::conf.keepalive);
1169 else if (conf->connectmode != conf_node::C_ONDEMAND 1360 else if (conf->connectmode != conf_node::C_ONDEMAND
1170 || THISNODE->connectmode != conf_node::C_ONDEMAND) 1361 || THISNODE->connectmode != conf_node::C_ONDEMAND)
1171 { 1362 {
1363 w.start (3);
1172 send_ping (si); 1364 send_ping (si);
1173 w.start (NOW + 5);
1174 } 1365 }
1175 else if (NOW < last_activity + ::conf.keepalive + 10) 1366 else if (when >= -10)
1176 // hold ondemand connections implicitly a few seconds longer 1367 // hold ondemand connections implicitly a few seconds longer
1177 // should delete octx, though, or something like that ;) 1368 // should delete octx, though, or something like that ;)
1178 w.start (last_activity + ::conf.keepalive + 10); 1369 w.start (when + 10);
1179 else 1370 else
1180 reset_connection (); 1371 reset_connection ();
1181} 1372}
1182 1373
1374void
1183void connection::send_connect_request (int id) 1375connection::send_connect_request (int id)
1184{ 1376{
1185 connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); 1377 connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1186 1378
1187 slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); 1379 slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
1380 conf->nodename, vpn->conns[id - 1]->conf->nodename,
1381 THISNODE->protocols);
1188 p->hmac_set (octx); 1382 p->hmac_set (octx);
1189 send_vpn_packet (p, si); 1383 send_vpn_packet (p, si);
1190 1384
1191 delete p; 1385 delete p;
1192} 1386}
1193 1387
1194void connection::script_node () 1388void
1389connection::script_init_env (const char *ext)
1195{ 1390{
1196 vpn->script_if_up ();
1197
1198 char *env; 1391 char *env;
1392 asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1393 asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1394 asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1395 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1396 conf->id & 0xff); putenv (env);
1397}
1398
1399void
1400connection::script_init_connect_env ()
1401{
1402 vpn->script_init_env ();
1403
1404 char *env;
1199 asprintf (&env, "DESTID=%d", conf->id); putenv (env); 1405 asprintf (&env, "DESTID=%d", conf->id); putenv (env);
1406 asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1200 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); 1407 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1201 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); 1408 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1202 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); 1409 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1203} 1410}
1204 1411
1412inline const char *
1205const char *connection::script_node_up () 1413connection::script_node_up ()
1206{ 1414{
1207 script_node (); 1415 script_init_connect_env ();
1208 1416
1209 putenv ("STATE=up"); 1417 putenv ((char *)"STATE=up");
1210 1418
1419 char *filename;
1420 asprintf (&filename,
1421 "%s/%s",
1422 confbase,
1211 return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; 1423 ::conf.script_node_up ? ::conf.script_node_up : "node-up");
1212}
1213 1424
1425 return filename;
1426}
1427
1428inline const char *
1429connection::script_node_change ()
1430{
1431 script_init_connect_env ();
1432
1433 putenv ((char *)"STATE=change");
1434
1435 char *filename;
1436 asprintf (&filename,
1437 "%s/%s",
1438 confbase,
1439 ::conf.script_node_change ? ::conf.script_node_change : "node-change");
1440
1441 return filename;
1442}
1443
1444inline const char *
1214const char *connection::script_node_down () 1445connection::script_node_down ()
1215{ 1446{
1216 script_node (); 1447 script_init_connect_env ();
1217 1448
1218 putenv ("STATE=down"); 1449 putenv ((char *)"STATE=down");
1219 1450
1220 return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; 1451 char *filename;
1452 asprintf (&filename,
1453 "%s/%s",
1454 confbase,
1455 ::conf.script_node_down ? ::conf.script_node_down : "node-down");
1456
1457 return filename;
1221} 1458}
1222 1459
1223connection::connection (struct vpn *vpn, conf_node *conf) 1460connection::connection (struct vpn *vpn, conf_node *conf)
1224: vpn(vpn), conf(conf) 1461: 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 1462#if ENABLE_DNS
1229, dns (0) 1463 dns (0),
1230#endif 1464#endif
1465 data_queue(conf->max_ttl, conf->max_queue + 1),
1466 vpn_queue(conf->max_ttl, conf->max_queue + 1)
1231{ 1467{
1468 rekey .set<connection, &connection::rekey_cb > (this);
1469 keepalive .set<connection, &connection::keepalive_cb > (this);
1470 establish_connection.set<connection, &connection::establish_connection_cb> (this);
1471
1472 last_establish_attempt = 0.;
1232 octx = ictx = 0; 1473 octx = ictx = 0;
1233 retry_cnt = 0;
1234 1474
1235 if (!conf->protocols) // make sure some protocol is enabled 1475 connectmode = conf->connectmode;
1236 conf->protocols = PROT_UDPv4;
1237 1476
1238 connectmode = conf_node::C_ALWAYS; // initial setting 1477 // queue a dummy packet to force an initial connection attempt
1478 if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
1479 vpn_queue.put (new net_packet);
1480
1239 reset_connection (); 1481 reset_connection ();
1240} 1482}
1241 1483
1242connection::~connection () 1484connection::~connection ()
1243{ 1485{
1244 shutdown (); 1486 shutdown ();
1245} 1487}
1246 1488
1489void
1247void connection_init () 1490connection_init ()
1248{ 1491{
1249 auth_rate_limiter.clear (); 1492 auth_rate_limiter.clear ();
1250 reset_rate_limiter.clear (); 1493 reset_rate_limiter.clear ();
1251} 1494}
1252 1495

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