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Comparing gvpe/src/connection.C (file contents):
Revision 1.28 by pcg, Tue Jan 27 05:56:35 2004 UTC vs.
Revision 1.82 by pcg, Fri Aug 15 18:35:24 2008 UTC

1/* 1/*
2 connection.C -- manage a single connection 2 connection.C -- manage a single connection
3 Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com> 3 Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de>
4 4
5 This file is part of GVPE.
6
5 This program is free software; you can redistribute it and/or modify 7 GVPE is free software; you can redistribute it and/or modify it
6 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
7 the Free Software Foundation; either version 2 of the License, or 9 Free Software Foundation; either version 3 of the License, or (at your
8 (at your option) any later version. 10 option) any later version.
9 11
10 This program is distributed in the hope that it will be useful, 12 This program is distributed in the hope that it will be useful, but
11 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
13 GNU General Public License for more details. 15 Public License for more details.
14 16
15 You should have received a copy of the GNU General Public License 17 You should have received a copy of the GNU General Public License along
16 along with this program; if not, write to the Free Software 18 with this program; if not, see <http://www.gnu.org/licenses/>.
17 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.
18*/ 30*/
19 31
20#include "config.h" 32#include "config.h"
21 33
22extern "C" {
23# include "lzf/lzf.h"
24}
25
26#include <cassert>
27
28#include <list> 34#include <list>
35#include <queue>
36#include <utility>
29 37
30#include <openssl/rand.h> 38#include <openssl/rand.h>
31#include <openssl/evp.h> 39#include <openssl/evp.h>
32#include <openssl/rsa.h> 40#include <openssl/rsa.h>
33#include <openssl/err.h> 41#include <openssl/err.h>
34
35#include "gettext.h"
36 42
37#include "conf.h" 43#include "conf.h"
38#include "slog.h" 44#include "slog.h"
39#include "device.h" 45#include "device.h"
40#include "vpn.h" 46#include "vpn.h"
… …
46# define RAND_pseudo_bytes RAND_bytes 52# define RAND_pseudo_bytes RAND_bytes
47#endif 53#endif
48 54
49#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic 55#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic
50 56
57#define ULTRA_FAST 1
58#define HLOG 15
59#include "lzf/lzf.h"
60#include "lzf/lzf_c.c"
61#include "lzf/lzf_d.c"
62
63//////////////////////////////////////////////////////////////////////////////
64
65static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
66static ev::child rs_child_ev;
67
68void // c++ requires external linkage here, apparently :(
69rs_child_cb (ev::child &w, int revents)
70{
71 w.stop ();
72
73 if (rs_queue.empty ())
74 return;
75
76 pid_t pid = run_script (*rs_queue.front ().first, false);
77 if (pid)
78 {
79 w.set (pid);
80 w.start ();
81 }
82 else
83 slog (L_WARN, rs_queue.front ().second);
84
85 delete rs_queue.front ().first;
86 rs_queue.pop ();
87}
88
89// despite the fancy name, this is quite a hack
90static void
91run_script_queued (run_script_cb *cb, const char *warnmsg)
92{
93 rs_queue.push (std::make_pair (cb, warnmsg));
94
95 if (!rs_child_ev.is_active ())
96 {
97 rs_child_ev.set<rs_child_cb> ();
98 rs_child_ev ();
99 }
100}
101
102//////////////////////////////////////////////////////////////////////////////
103
51struct crypto_ctx 104struct crypto_ctx
52{ 105{
53 EVP_CIPHER_CTX cctx; 106 EVP_CIPHER_CTX cctx;
54 HMAC_CTX hctx; 107 HMAC_CTX hctx;
55 108
… …
58}; 111};
59 112
60crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) 113crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)
61{ 114{
62 EVP_CIPHER_CTX_init (&cctx); 115 EVP_CIPHER_CTX_init (&cctx);
63 EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc); 116 require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));
64 HMAC_CTX_init (&hctx); 117 HMAC_CTX_init (&hctx);
65 HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); 118 HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
66} 119}
67 120
68crypto_ctx::~crypto_ctx () 121crypto_ctx::~crypto_ctx ()
69{ 122{
70 EVP_CIPHER_CTX_cleanup (&cctx); 123 require (EVP_CIPHER_CTX_cleanup (&cctx));
71 HMAC_CTX_cleanup (&hctx); 124 HMAC_CTX_cleanup (&hctx);
72} 125}
73 126
74static void 127static void
75rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) 128rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)
76{ 129{
77 EVP_MD_CTX ctx; 130 EVP_MD_CTX ctx;
78 131
79 EVP_MD_CTX_init (&ctx); 132 EVP_MD_CTX_init (&ctx);
80 EVP_DigestInit (&ctx, RSA_HASH); 133 require (EVP_DigestInit (&ctx, RSA_HASH));
81 EVP_DigestUpdate(&ctx, &chg, sizeof chg); 134 require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
82 EVP_DigestUpdate(&ctx, &id, sizeof id); 135 require (EVP_DigestUpdate(&ctx, &id, sizeof id));
83 EVP_DigestFinal (&ctx, (unsigned char *)&h, 0); 136 require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
84 EVP_MD_CTX_cleanup (&ctx); 137 EVP_MD_CTX_cleanup (&ctx);
85} 138}
86 139
87struct rsa_entry { 140struct rsa_entry
141{
88 tstamp expire; 142 tstamp expire;
89 rsaid id; 143 rsaid id;
90 rsachallenge chg; 144 rsachallenge chg;
91}; 145};
92 146
93struct rsa_cache : list<rsa_entry> 147struct rsa_cache : list<rsa_entry>
94{ 148{
95 void cleaner_cb (time_watcher &w); time_watcher cleaner; 149 inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;
96 150
97 bool find (const rsaid &id, rsachallenge &chg) 151 bool find (const rsaid &id, rsachallenge &chg)
98 { 152 {
99 for (iterator i = begin (); i != end (); ++i) 153 for (iterator i = begin (); i != end (); ++i)
100 { 154 {
101 if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) 155 if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ())
102 { 156 {
103 memcpy (&chg, &i->chg, sizeof chg); 157 memcpy (&chg, &i->chg, sizeof chg);
104 158
105 erase (i); 159 erase (i);
106 return true; 160 return true;
107 } 161 }
108 } 162 }
109 163
110 if (cleaner.at < NOW) 164 if (!cleaner.is_active ())
111 cleaner.start (NOW + RSA_TTL); 165 cleaner.again ();
112 166
113 return false; 167 return false;
114 } 168 }
115 169
116 void gen (rsaid &id, rsachallenge &chg) 170 void gen (rsaid &id, rsachallenge &chg)
117 { 171 {
118 rsa_entry e; 172 rsa_entry e;
119 173
120 RAND_bytes ((unsigned char *)&id, sizeof id); 174 RAND_bytes ((unsigned char *)&id, sizeof id);
121 RAND_bytes ((unsigned char *)&chg, sizeof chg); 175 RAND_bytes ((unsigned char *)&chg, sizeof chg);
122 176
123 e.expire = NOW + RSA_TTL; 177 e.expire = ev_now () + RSA_TTL;
124 e.id = id; 178 e.id = id;
125 memcpy (&e.chg, &chg, sizeof chg); 179 memcpy (&e.chg, &chg, sizeof chg);
126 180
127 push_back (e); 181 push_back (e);
128 182
129 if (cleaner.at < NOW) 183 if (!cleaner.is_active ())
130 cleaner.start (NOW + RSA_TTL); 184 cleaner.again ();
131 } 185 }
132 186
133 rsa_cache () 187 rsa_cache ()
134 : cleaner (this, &rsa_cache::cleaner_cb) 188 {
135 { } 189 cleaner.set<rsa_cache, &rsa_cache::cleaner_cb> (this);
190 cleaner.set (RSA_TTL, RSA_TTL);
191 }
136 192
137} rsa_cache; 193} rsa_cache;
138 194
139void rsa_cache::cleaner_cb (time_watcher &w) 195void rsa_cache::cleaner_cb (ev::timer &w, int revents)
140{ 196{
141 if (!empty ()) 197 if (empty ())
198 w.stop ();
199 else
142 { 200 {
143 w.start (NOW + RSA_TTL);
144
145 for (iterator i = begin (); i != end (); ) 201 for (iterator i = begin (); i != end (); )
146 if (i->expire <= NOW) 202 if (i->expire <= ev_now ())
147 i = erase (i); 203 i = erase (i);
148 else 204 else
149 ++i; 205 ++i;
150 } 206 }
151} 207}
152 208
153////////////////////////////////////////////////////////////////////////////// 209//////////////////////////////////////////////////////////////////////////////
154 210
155void pkt_queue::put (net_packet *p) 211pkt_queue::pkt_queue (double max_ttl, int max_queue)
212: max_ttl (max_ttl), max_queue (max_queue)
156{ 213{
157 if (queue[i]) 214 queue = new pkt [max_queue];
158 {
159 delete queue[i];
160 j = (j + 1) % QUEUEDEPTH;
161 }
162 215
163 queue[i] = p;
164
165 i = (i + 1) % QUEUEDEPTH;
166}
167
168net_packet *pkt_queue::get ()
169{
170 net_packet *p = queue[j];
171
172 if (p)
173 {
174 queue[j] = 0;
175 j = (j + 1) % QUEUEDEPTH;
176 }
177
178 return p;
179}
180
181pkt_queue::pkt_queue ()
182{
183 memset (queue, 0, sizeof (queue));
184 i = 0; 216 i = 0;
185 j = 0; 217 j = 0;
218
219 expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
186} 220}
187 221
188pkt_queue::~pkt_queue () 222pkt_queue::~pkt_queue ()
189{ 223{
190 for (i = QUEUEDEPTH; --i > 0; ) 224 while (net_packet *p = get ())
225 delete p;
226
191 delete queue[i]; 227 delete [] queue;
192} 228}
193 229
230void pkt_queue::expire_cb (ev::timer &w, int revents)
231{
232 ev_tstamp expire = ev_now () - max_ttl;
233
234 for (;;)
235 {
236 if (empty ())
237 break;
238
239 double diff = queue[j].tstamp - expire;
240
241 if (diff >= 0.)
242 {
243 w.start (diff > 0.5 ? diff : 0.5);
244 break;
245 }
246
247 delete get ();
248 }
249}
250
251void pkt_queue::put (net_packet *p)
252{
253 ev_tstamp now = ev_now ();
254
255 // start expiry timer
256 if (empty ())
257 expire.start (max_ttl);
258
259 int ni = i + 1 == max_queue ? 0 : i + 1;
260
261 if (ni == j)
262 delete get ();
263
264 queue[i].pkt = p;
265 queue[i].tstamp = now;
266
267 i = ni;
268}
269
270net_packet *pkt_queue::get ()
271{
272 if (empty ())
273 return 0;
274
275 net_packet *p = queue[j].pkt;
276 queue[j].pkt = 0;
277
278 j = j + 1 == max_queue ? 0 : j + 1;
279
280 return p;
281}
282
194struct net_rateinfo { 283struct net_rateinfo
284{
195 u32 host; 285 u32 host;
196 double pcnt, diff; 286 double pcnt, diff;
197 tstamp last; 287 tstamp last;
198}; 288};
199 289
200// only do action once every x seconds per host whole allowing bursts. 290// only do action once every x seconds per host whole allowing bursts.
201// this implementation ("splay list" ;) is inefficient, 291// this implementation ("splay list" ;) is inefficient,
202// but low on resources. 292// but low on resources.
203struct net_rate_limiter : list<net_rateinfo> 293struct net_rate_limiter : list<net_rateinfo>
204{ 294{
205 static const double ALPHA = 1. - 1. / 600.; // allow bursts 295# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
206 static const double CUTOFF = 10.; // one event every CUTOFF seconds 296# define NRL_CUTOFF 10. // one event every CUTOFF seconds
207 static const double EXPIRE = CUTOFF * 30.; // expire entries after this time 297# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
208 static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value 298# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
209 299
210 bool can (const sockinfo &si) { return can((u32)si.host); } 300 bool can (const sockinfo &si) { return can((u32)si.host); }
211 bool can (u32 host); 301 bool can (u32 host);
212}; 302};
213 303
… …
218 iterator i; 308 iterator i;
219 309
220 for (i = begin (); i != end (); ) 310 for (i = begin (); i != end (); )
221 if (i->host == host) 311 if (i->host == host)
222 break; 312 break;
223 else if (i->last < NOW - EXPIRE) 313 else if (i->last < ev_now () - NRL_EXPIRE)
224 i = erase (i); 314 i = erase (i);
225 else 315 else
226 i++; 316 i++;
227 317
228 if (i == end ()) 318 if (i == end ())
229 { 319 {
230 net_rateinfo ri; 320 net_rateinfo ri;
231 321
232 ri.host = host; 322 ri.host = host;
233 ri.pcnt = 1.; 323 ri.pcnt = 1.;
234 ri.diff = MAXDIF; 324 ri.diff = NRL_MAXDIF;
235 ri.last = NOW; 325 ri.last = ev_now ();
236 326
237 push_front (ri); 327 push_front (ri);
238 328
239 return true; 329 return true;
240 } 330 }
241 else 331 else
242 { 332 {
243 net_rateinfo ri (*i); 333 net_rateinfo ri (*i);
244 erase (i); 334 erase (i);
245 335
246 ri.pcnt = ri.pcnt * ALPHA; 336 ri.pcnt = ri.pcnt * NRL_ALPHA;
247 ri.diff = ri.diff * ALPHA + (NOW - ri.last); 337 ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
248 338
249 ri.last = NOW; 339 ri.last = ev_now ();
250 340
251 double dif = ri.diff / ri.pcnt; 341 double dif = ri.diff / ri.pcnt;
252 342
253 bool send = dif > CUTOFF; 343 bool send = dif > NRL_CUTOFF;
254 344
255 if (dif > MAXDIF) 345 if (dif > NRL_MAXDIF)
256 { 346 {
257 ri.pcnt = 1.; 347 ri.pcnt = 1.;
258 ri.diff = MAXDIF; 348 ri.diff = NRL_MAXDIF;
259 } 349 }
260 else if (send) 350 else if (send)
261 ri.pcnt++; 351 ri.pcnt++;
262 352
263 push_front (ri); 353 push_front (ri);
… …
333 int outl = 0, outl2; 423 int outl = 0, outl2;
334 ptype type = PT_DATA_UNCOMPRESSED; 424 ptype type = PT_DATA_UNCOMPRESSED;
335 425
336#if ENABLE_COMPRESSION 426#if ENABLE_COMPRESSION
337 u8 cdata[MAX_MTU]; 427 u8 cdata[MAX_MTU];
338 u32 cl;
339 428
429 if (conn->features & ENABLE_COMPRESSION)
430 {
340 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); 431 u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
432
341 if (cl) 433 if (cl)
342 { 434 {
343 type = PT_DATA_COMPRESSED; 435 type = PT_DATA_COMPRESSED;
344 d = cdata; 436 d = cdata;
345 l = cl + 2; 437 l = cl + 2;
346 438
347 d[0] = cl >> 8; 439 d[0] = cl >> 8;
348 d[1] = cl; 440 d[1] = cl;
441 }
349 } 442 }
350#endif 443#endif
351 444
352 EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); 445 require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));
353 446
354 struct { 447 struct {
355#if RAND_SIZE 448#if RAND_SIZE
356 u8 rnd[RAND_SIZE]; 449 u8 rnd[RAND_SIZE];
357#endif 450#endif
… …
361 datahdr.seqno = ntohl (seqno); 454 datahdr.seqno = ntohl (seqno);
362#if RAND_SIZE 455#if RAND_SIZE
363 RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); 456 RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
364#endif 457#endif
365 458
366 EVP_EncryptUpdate (cctx, 459 require (EVP_EncryptUpdate (cctx,
367 (unsigned char *) data + outl, &outl2, 460 (unsigned char *) data + outl, &outl2,
368 (unsigned char *) &datahdr, DATAHDR); 461 (unsigned char *) &datahdr, DATAHDR));
369 outl += outl2; 462 outl += outl2;
370 463
371 EVP_EncryptUpdate (cctx, 464 require (EVP_EncryptUpdate (cctx,
372 (unsigned char *) data + outl, &outl2, 465 (unsigned char *) data + outl, &outl2,
373 (unsigned char *) d, l); 466 (unsigned char *) d, l));
374 outl += outl2; 467 outl += outl2;
375 468
376 EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); 469 require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
377 outl += outl2; 470 outl += outl2;
378 471
379 len = outl + data_hdr_size (); 472 len = outl + data_hdr_size ();
380 473
381 set_hdr (type, dst); 474 set_hdr (type, dst);
… …
390 int outl = 0, outl2; 483 int outl = 0, outl2;
391 tap_packet *p = new tap_packet; 484 tap_packet *p = new tap_packet;
392 u8 *d; 485 u8 *d;
393 u32 l = len - data_hdr_size (); 486 u32 l = len - data_hdr_size ();
394 487
395 EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); 488 require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));
396 489
397#if ENABLE_COMPRESSION 490#if ENABLE_COMPRESSION
398 u8 cdata[MAX_MTU]; 491 u8 cdata[MAX_MTU];
399 492
400 if (type == PT_DATA_COMPRESSED) 493 if (type == PT_DATA_COMPRESSED)
… …
402 else 495 else
403#endif 496#endif
404 d = &(*p)[6 + 6 - DATAHDR]; 497 d = &(*p)[6 + 6 - DATAHDR];
405 498
406 /* this overwrites part of the src mac, but we fix that later */ 499 /* this overwrites part of the src mac, but we fix that later */
407 EVP_DecryptUpdate (cctx, 500 require (EVP_DecryptUpdate (cctx,
408 d, &outl2, 501 d, &outl2,
409 (unsigned char *)&data, len - data_hdr_size ()); 502 (unsigned char *)&data, len - data_hdr_size ()));
410 outl += outl2; 503 outl += outl2;
411 504
412 EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); 505 require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
413 outl += outl2; 506 outl += outl2;
414 507
415 seqno = ntohl (*(u32 *)(d + RAND_SIZE)); 508 seqno = ntohl (*(u32 *)(d + RAND_SIZE));
416 509
417 id2mac (dst () ? dst() : THISNODE->id, p->dst); 510 id2mac (dst () ? dst() : THISNODE->id, p->dst);
… …
446{ 539{
447 // actually, hmaclen cannot be checked because the hmac 540 // actually, hmaclen cannot be checked because the hmac
448 // field comes before this data, so peers with other 541 // field comes before this data, so peers with other
449 // hmacs simply will not work. 542 // hmacs simply will not work.
450 u8 prot_major, prot_minor, randsize, hmaclen; 543 u8 prot_major, prot_minor, randsize, hmaclen;
451 u8 flags, challengelen, pad2, pad3; 544 u8 flags, challengelen, features, pad3;
452 u32 cipher_nid, digest_nid, hmac_nid; 545 u32 cipher_nid, digest_nid, hmac_nid;
453
454 const u8 curflags () const
455 {
456 return 0x80
457 | (ENABLE_COMPRESSION ? 0x01 : 0x00);
458 }
459 546
460 void setup (ptype type, int dst); 547 void setup (ptype type, int dst);
461 bool chk_config () const; 548 bool chk_config () const;
549
550 static u8 get_features ()
551 {
552 u8 f = 0;
553#if ENABLE_COMPRESSION
554 f |= FEATURE_COMPRESSION;
555#endif
556#if ENABLE_ROHC
557 f |= FEATURE_ROHC;
558#endif
559#if ENABLE_BRIDGING
560 f |= FEATURE_BRIDGING;
561#endif
562 return f;
563 }
462}; 564};
463 565
464void config_packet::setup (ptype type, int dst) 566void config_packet::setup (ptype type, int dst)
465{ 567{
466 prot_major = PROTOCOL_MAJOR; 568 prot_major = PROTOCOL_MAJOR;
467 prot_minor = PROTOCOL_MINOR; 569 prot_minor = PROTOCOL_MINOR;
468 randsize = RAND_SIZE; 570 randsize = RAND_SIZE;
469 hmaclen = HMACLENGTH; 571 hmaclen = HMACLENGTH;
470 flags = curflags (); 572 flags = 0;
471 challengelen = sizeof (rsachallenge); 573 challengelen = sizeof (rsachallenge);
574 features = get_features ();
472 575
473 cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); 576 cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
474 digest_nid = htonl (EVP_MD_type (RSA_HASH)); 577 digest_nid = htonl (EVP_MD_type (RSA_HASH));
475 hmac_nid = htonl (EVP_MD_type (DIGEST)); 578 hmac_nid = htonl (EVP_MD_type (DIGEST));
476 579
… …
484 slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); 587 slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
485 else if (randsize != RAND_SIZE) 588 else if (randsize != RAND_SIZE)
486 slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); 589 slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
487 else if (hmaclen != HMACLENGTH) 590 else if (hmaclen != HMACLENGTH)
488 slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); 591 slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
489 else if (flags != curflags ())
490 slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
491 else if (challengelen != sizeof (rsachallenge)) 592 else if (challengelen != sizeof (rsachallenge))
492 slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); 593 slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
493 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) 594 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
494 slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); 595 slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));
495 else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) 596 else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
… …
571///////////////////////////////////////////////////////////////////////////// 672/////////////////////////////////////////////////////////////////////////////
572 673
573void 674void
574connection::connection_established () 675connection::connection_established ()
575{ 676{
677 slog (L_NOISE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx);
678
576 if (ictx && octx) 679 if (ictx && octx)
577 { 680 {
578 connectmode = conf->connectmode; 681 // make sure rekeying timeouts are slightly asymmetric
579 682 ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
580 rekey.start (NOW + ::conf.rekey); 683 rekey.start (rekey_interval, rekey_interval);
581 keepalive.start (NOW + ::conf.keepalive); 684 keepalive.start (::conf.keepalive);
582 685
583 // send queued packets 686 // send queued packets
584 if (ictx && octx) 687 if (ictx && octx)
585 { 688 {
586 while (tap_packet *p = (tap_packet *)data_queue.get ()) 689 while (tap_packet *p = (tap_packet *)data_queue.get ())
587 { 690 {
588 send_data_packet (p); 691 if (p->len) send_data_packet (p);
589 delete p; 692 delete p;
590 } 693 }
591 694
592 while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) 695 while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
593 { 696 {
594 send_vpn_packet (p, si, IPTOS_RELIABILITY); 697 if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
595 delete p; 698 delete p;
596 } 699 }
597 } 700 }
701
702 vpn->connection_established (this);
598 } 703 }
599 else 704 else
600 { 705 {
601 retry_cnt = 0; 706 retry_cnt = 0;
602 establish_connection.start (NOW + 5); 707 establish_connection.start (5);
603 keepalive.stop (); 708 keepalive.stop ();
604 rekey.stop (); 709 rekey.stop ();
605 } 710 }
606} 711}
607 712
608void 713void
609connection::reset_si () 714connection::reset_si ()
610{ 715{
716 if (vpn->can_direct (THISNODE, conf))
611 protocol = best_protocol (THISNODE->protocols & conf->protocols); 717 protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
612 718 else
613 // mask out protocols we cannot establish 719 {
614 if (!conf->udp_port) protocol &= ~PROT_UDPv4; 720 slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
615 if (!conf->tcp_port) protocol &= ~PROT_TCPv4; 721 protocol = 0;
722 }
616 723
617 si.set (conf, protocol); 724 si.set (conf, protocol);
725
726 is_direct = si.valid ();
618} 727}
619 728
620// ensure sockinfo is valid, forward if necessary 729// ensure sockinfo is valid, forward if necessary
621const sockinfo & 730const sockinfo &
622connection::forward_si (const sockinfo &si) const 731connection::forward_si (const sockinfo &si) const
623{ 732{
624 if (!si.valid ()) 733 if (!si.valid ())
625 { 734 {
626 connection *r = vpn->find_router (); 735 connection *r = vpn->find_router_for (this);
627 736
628 if (r) 737 if (r)
629 { 738 {
630 slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"), 739 slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
631 conf->nodename, r->conf->nodename); 740 conf->nodename, r->conf->nodename);
632 return r->si; 741 return r->si;
633 } 742 }
634 else 743 else
635 slog (L_DEBUG, _("%s: node unreachable, no common protocol"), 744 slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
636 conf->nodename); 745 conf->nodename);
637 } 746 }
638 747
639 return si; 748 return si;
640} 749}
… …
650connection::send_ping (const sockinfo &si, u8 pong) 759connection::send_ping (const sockinfo &si, u8 pong)
651{ 760{
652 ping_packet *pkt = new ping_packet; 761 ping_packet *pkt = new ping_packet;
653 762
654 pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); 763 pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
764
765 slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
766
655 send_vpn_packet (pkt, si, IPTOS_LOWDELAY); 767 send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
656 768
657 delete pkt; 769 delete pkt;
658} 770}
659 771
… …
678 790
679 rsachallenge chg; 791 rsachallenge chg;
680 rsa_cache.gen (pkt->id, chg); 792 rsa_cache.gen (pkt->id, chg);
681 rsa_encrypt (conf->rsa_key, chg, pkt->encr); 793 rsa_encrypt (conf->rsa_key, chg, pkt->encr);
682 794
683 slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); 795 slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
684 796
685 send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly 797 send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
686 798
687 delete pkt; 799 delete pkt;
688} 800}
… …
696 808
697 rsa_hash (id, chg, pkt->response); 809 rsa_hash (id, chg, pkt->response);
698 810
699 pkt->hmac_set (octx); 811 pkt->hmac_set (octx);
700 812
701 slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si); 813 slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
702 814
703 send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly 815 send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
704 816
705 delete pkt; 817 delete pkt;
706} 818}
707 819
708void 820void
709connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) 821connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
710{ 822{
711 slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", 823 slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s)", conf->nodename,
712 conf->id, rid, (const char *)rsi); 824 vpn->conns[rid - 1]->conf->nodename, (const char *)rsi);
713 825
714 connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); 826 connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
715 827
716 r->hmac_set (octx); 828 r->hmac_set (octx);
717 send_vpn_packet (r, si); 829 send_vpn_packet (r, si);
718 830
719 delete r; 831 delete r;
720} 832}
721 833
722void 834inline void
723connection::establish_connection_cb (time_watcher &w) 835connection::establish_connection_cb (ev::timer &w, int revents)
724{ 836{
725 if (!ictx 837 if (!ictx
726 && conf != THISNODE 838 && conf != THISNODE
727 && connectmode != conf_node::C_NEVER 839 && connectmode != conf_node::C_NEVER
728 && connectmode != conf_node::C_DISABLED 840 && connectmode != conf_node::C_DISABLED
729 && NOW > w.at) 841 && !w.is_active ())
730 { 842 {
731 double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; 843 // a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
732 844 // and stop trying. should probably be handled by a per-connection expire handler.
733 if (retry_int < 3600 * 8) 845 if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
846 {
847 reset_connection ();
734 retry_cnt++; 848 return;
849 }
735 850
736 w.start (NOW + retry_int); 851 last_establish_attempt = ev_now ();
852
853 ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
854 ? (retry_cnt & 3) + 1
855 : 1 << (retry_cnt >> 2));
737 856
738 reset_si (); 857 reset_si ();
739 858
740 if (si.prot && !si.host) 859 bool slow = si.prot & PROT_SLOW;
860
861 if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
862 {
863 /*TODO*/ /* start the timer so we don't recurse endlessly */
864 w.start (1);
741 vpn->send_connect_request (conf->id); 865 vpn->send_connect_request (this);
866 }
742 else 867 else
743 { 868 {
869 if (si.valid ())
870 slog (L_DEBUG, _("%s: sending direct connection request to %s."),
871 conf->nodename, (const char *)si);
872
744 const sockinfo &dsi = forward_si (si); 873 const sockinfo &dsi = forward_si (si);
874
875 slow = slow || (dsi.prot & PROT_SLOW);
745 876
746 if (dsi.valid () && auth_rate_limiter.can (dsi)) 877 if (dsi.valid () && auth_rate_limiter.can (dsi))
747 { 878 {
748 if (retry_cnt < 4) 879 if (retry_cnt < 4)
749 send_auth_request (dsi, true); 880 send_auth_request (dsi, true);
750 else 881 else
751 send_ping (dsi, 0); 882 send_ping (dsi, 0);
752 } 883 }
753 } 884 }
885
886 retry_int *= slow ? 8. : 0.9;
887
888 if (retry_int < conf->max_retry)
889 retry_cnt++;
890 else
891 retry_int = conf->max_retry;
892
893 w.start (retry_int);
754 } 894 }
755} 895}
756 896
757void 897void
758connection::reset_connection () 898connection::reset_connection ()
… …
761 { 901 {
762 slog (L_INFO, _("%s(%s): connection lost"), 902 slog (L_INFO, _("%s(%s): connection lost"),
763 conf->nodename, (const char *)si); 903 conf->nodename, (const char *)si);
764 904
765 if (::conf.script_node_down) 905 if (::conf.script_node_down)
766 run_script (run_script_cb (this, &connection::script_node_down), false); 906 {
907 run_script_cb *cb = new run_script_cb;
908 cb->set<connection, &connection::script_node_down> (this);
909 run_script_queued (cb, _("node-down command execution failed, continuing."));
910 }
767 } 911 }
768 912
769 delete ictx; ictx = 0; 913 delete ictx; ictx = 0;
770 delete octx; octx = 0; 914 delete octx; octx = 0;
915#if ENABLE_DNS
916 dnsv4_reset_connection ();
917#endif
771 918
772 si.host= 0; 919 si.host = 0;
773 920
774 last_activity = 0; 921 last_activity = 0.;
922 //last_si_change = 0.;
775 retry_cnt = 0; 923 retry_cnt = 0;
776 924
777 rekey.stop (); 925 rekey.stop ();
778 keepalive.stop (); 926 keepalive.stop ();
779 establish_connection.stop (); 927 establish_connection.stop ();
… …
786 send_reset (si); 934 send_reset (si);
787 935
788 reset_connection (); 936 reset_connection ();
789} 937}
790 938
791void 939// poor-man's rekeying
792connection::rekey_cb (time_watcher &w) 940inline void
941connection::rekey_cb (ev::timer &w, int revents)
793{ 942{
794 reset_connection (); 943 reset_connection ();
795 establish_connection (); 944 establish_connection ();
796} 945}
797 946
… …
813 if (oseqno > MAX_SEQNO) 962 if (oseqno > MAX_SEQNO)
814 rekey (); 963 rekey ();
815} 964}
816 965
817void 966void
967connection::post_inject_queue ()
968{
969 // force a connection every now and when when packets are sent (max 1/s)
970 if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
971 establish_connection.stop ();
972
973 establish_connection ();
974}
975
976void
818connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) 977connection::inject_data_packet (tap_packet *pkt)
819{ 978{
820 if (ictx && octx) 979 if (ictx && octx)
821 send_data_packet (pkt); 980 send_data_packet (pkt);
822 else 981 else
823 { 982 {
824 if (!broadcast)//DDDD
825 data_queue.put (new tap_packet (*pkt)); 983 data_queue.put (new tap_packet (*pkt));
826 984 post_inject_queue ();
827 establish_connection ();
828 } 985 }
829} 986}
830 987
831void connection::inject_vpn_packet (vpn_packet *pkt, int tos) 988void connection::inject_vpn_packet (vpn_packet *pkt, int tos)
832{ 989{
833 if (ictx && octx) 990 if (ictx && octx)
834 send_vpn_packet (pkt, si, tos); 991 send_vpn_packet (pkt, si, tos);
835 else 992 else
836 { 993 {
837 vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); 994 vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
838 995 post_inject_queue ();
839 establish_connection ();
840 } 996 }
841} 997}
842 998
843void 999void
844connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) 1000connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
845{ 1001{
846 last_activity = NOW; 1002 last_activity = ev_now ();
847 1003
848 slog (L_NOISE, "<<%d received packet type %d from %d to %d", 1004 slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
849 conf->id, pkt->typ (), pkt->src (), pkt->dst ()); 1005 conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
1006
1007 if (connectmode == conf_node::C_DISABLED)
1008 return;
850 1009
851 switch (pkt->typ ()) 1010 switch (pkt->typ ())
852 { 1011 {
853 case vpn_packet::PT_PING: 1012 case vpn_packet::PT_PING:
1013 slog (L_TRACE, "%s >> PT_PING", conf->nodename);
1014
854 // we send pings instead of auth packets after some retries, 1015 // we send pings instead of auth packets after some retries,
855 // so reset the retry counter and establish a connection 1016 // so reset the retry counter and establish a connection
856 // when we receive a ping. 1017 // when we receive a ping.
857 if (!ictx) 1018 if (!ictx)
858 { 1019 {
859 if (auth_rate_limiter.can (rsi)) 1020 if (auth_rate_limiter.can (rsi))
860 send_auth_request (rsi, true); 1021 send_auth_request (rsi, true);
861 } 1022 }
862 else 1023 else
1024 // we would love to change thre socket address here, but ping's aren't
1025 // authenticated, so we best ignore it.
863 send_ping (rsi, 1); // pong 1026 send_ping (rsi, 1); // pong
864 1027
865 break; 1028 break;
866 1029
867 case vpn_packet::PT_PONG: 1030 case vpn_packet::PT_PONG:
1031 slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
868 break; 1032 break;
869 1033
870 case vpn_packet::PT_RESET: 1034 case vpn_packet::PT_RESET:
871 { 1035 {
872 reset_connection (); 1036 reset_connection ();
873 1037
874 config_packet *p = (config_packet *) pkt; 1038 config_packet *p = (config_packet *) pkt;
875 1039
876 if (!p->chk_config ()) 1040 if (!p->chk_config ())
877 { 1041 {
878 slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"), 1042 slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
879 conf->nodename, (const char *)rsi); 1043 conf->nodename, (const char *)rsi);
880 connectmode = conf_node::C_DISABLED; 1044 connectmode = conf_node::C_DISABLED;
881 } 1045 }
882 else if (connectmode == conf_node::C_ALWAYS) 1046 else if (connectmode == conf_node::C_ALWAYS)
883 establish_connection (); 1047 establish_connection ();
… …
887 case vpn_packet::PT_AUTH_REQ: 1051 case vpn_packet::PT_AUTH_REQ:
888 if (auth_rate_limiter.can (rsi)) 1052 if (auth_rate_limiter.can (rsi))
889 { 1053 {
890 auth_req_packet *p = (auth_req_packet *) pkt; 1054 auth_req_packet *p = (auth_req_packet *) pkt;
891 1055
892 slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate); 1056 slog (L_TRACE, "%s >> PT_AUTH_REQ(%s)", conf->nodename, p->initiate ? "initiate" : "reply");
893 1057
894 if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) 1058 if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))
895 { 1059 {
896 if (p->prot_minor != PROTOCOL_MINOR) 1060 if (p->prot_minor != PROTOCOL_MINOR)
897 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), 1061 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
… …
915 1079
916 octx = new crypto_ctx (k, 1); 1080 octx = new crypto_ctx (k, 1);
917 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; 1081 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;
918 1082
919 conf->protocols = p->protocols; 1083 conf->protocols = p->protocols;
1084 features = p->features & config_packet::get_features ();
920 1085
921 send_auth_response (rsi, p->id, k); 1086 send_auth_response (rsi, p->id, k);
922 1087
923 connection_established (); 1088 connection_established ();
924 1089
925 break; 1090 break;
926 } 1091 }
927 } 1092 }
928 else 1093 else
929 slog (L_WARN, _("%s(%s): protocol mismatch"), 1094 slog (L_WARN, _("%s(%s): protocol mismatch."),
930 conf->nodename, (const char *)rsi); 1095 conf->nodename, (const char *)rsi);
931 1096
932 send_reset (rsi); 1097 send_reset (rsi);
933 } 1098 }
934 1099
935 break; 1100 break;
936 1101
937 case vpn_packet::PT_AUTH_RES: 1102 case vpn_packet::PT_AUTH_RES:
938 { 1103 {
939 auth_res_packet *p = (auth_res_packet *) pkt; 1104 auth_res_packet *p = (auth_res_packet *)pkt;
940 1105
941 slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); 1106 slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
942 1107
943 if (p->chk_config ()) 1108 if (p->chk_config ())
944 { 1109 {
945 if (p->prot_minor != PROTOCOL_MINOR) 1110 if (p->prot_minor != PROTOCOL_MINOR)
946 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), 1111 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
… …
949 1114
950 rsachallenge chg; 1115 rsachallenge chg;
951 1116
952 if (!rsa_cache.find (p->id, chg)) 1117 if (!rsa_cache.find (p->id, chg))
953 { 1118 {
954 slog (L_ERR, _("%s(%s): unrequested auth response ignored"), 1119 slog (L_ERR, _("%s(%s): unrequested auth response, ignoring."),
955 conf->nodename, (const char *)rsi); 1120 conf->nodename, (const char *)rsi);
956 break; 1121 break;
957 } 1122 }
958 else 1123 else
959 { 1124 {
960 crypto_ctx *cctx = new crypto_ctx (chg, 0); 1125 crypto_ctx *cctx = new crypto_ctx (chg, 0);
961 1126
962 if (!p->hmac_chk (cctx)) 1127 if (!p->hmac_chk (cctx))
963 { 1128 {
964 slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" 1129 slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
965 "could be an attack, or just corruption or a synchronization error"), 1130 "could be an attack, or just corruption or a synchronization error."),
966 conf->nodename, (const char *)rsi); 1131 conf->nodename, (const char *)rsi);
967 break; 1132 break;
968 } 1133 }
969 else 1134 else
970 { 1135 {
… …
981 iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid 1146 iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
982 1147
983 si = rsi; 1148 si = rsi;
984 protocol = rsi.prot; 1149 protocol = rsi.prot;
985 1150
1151 slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
1152 conf->nodename, (const char *)rsi,
1153 is_direct ? "direct" : "forwarded",
1154 p->prot_major, p->prot_minor);
1155
986 connection_established (); 1156 connection_established ();
987 1157
988 slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
989 conf->nodename, (const char *)rsi,
990 p->prot_major, p->prot_minor);
991
992 if (::conf.script_node_up) 1158 if (::conf.script_node_up)
993 run_script (run_script_cb (this, &connection::script_node_up), false); 1159 {
1160 run_script_cb *cb = new run_script_cb;
1161 cb->set<connection, &connection::script_node_up> (this);
1162 run_script_queued (cb, _("node-up command execution failed, continuing."));
1163 }
994 1164
995 break; 1165 break;
996 } 1166 }
997 else 1167 else
998 slog (L_ERR, _("%s(%s): sent and received challenge do not match"), 1168 slog (L_ERR, _("%s(%s): sent and received challenge do not match."),
999 conf->nodename, (const char *)rsi); 1169 conf->nodename, (const char *)rsi);
1000 } 1170 }
1001 1171
1002 delete cctx; 1172 delete cctx;
1003 } 1173 }
… …
1019 { 1189 {
1020 vpndata_packet *p = (vpndata_packet *)pkt; 1190 vpndata_packet *p = (vpndata_packet *)pkt;
1021 1191
1022 if (!p->hmac_chk (ictx)) 1192 if (!p->hmac_chk (ictx))
1023 slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" 1193 slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1024 "could be an attack, or just corruption or a synchronization error"), 1194 "could be an attack, or just corruption or a synchronization error."),
1025 conf->nodename, (const char *)rsi); 1195 conf->nodename, (const char *)rsi);
1026 else 1196 else
1027 { 1197 {
1028 u32 seqno; 1198 u32 seqno;
1029 tap_packet *d = p->unpack (this, seqno); 1199 tap_packet *d = p->unpack (this, seqno);
1200 int seqclass = iseqno.seqno_classify (seqno);
1030 1201
1031 if (iseqno.recv_ok (seqno)) 1202 if (seqclass == 0) // ok
1032 { 1203 {
1033 vpn->tap->send (d); 1204 vpn->tap->send (d);
1034 1205
1035 if (si != rsi) 1206 if (si != rsi)
1036 { 1207 {
1037 // fast re-sync on connection changes, useful especially for tcp/ip 1208 // fast re-sync on source address changes, useful especially for tcp/ip
1209 //if (last_si_change < ev_now () + 5.)
1038 si = rsi; 1210 // {
1039
1040 slog (L_INFO, _("%s(%s): socket address changed to %s"), 1211 slog (L_INFO, _("%s(%s): changing socket address to %s."),
1041 conf->nodename, (const char *)si, (const char *)rsi); 1212 conf->nodename, (const char *)si, (const char *)rsi);
1213
1214 si = rsi;
1215 // }
1216 //else
1217 // slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
1218 // conf->nodename, (const char *)si, (const char *)rsi);
1042 } 1219 }
1043
1044 delete d;
1045
1046 break;
1047 } 1220 }
1221 else if (seqclass == 1) // far history
1222 slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
1223 "possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
1224 else if (seqclass == 2) // in-window duplicate, happens often on wireless
1225 slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
1226 "possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
1227 else if (seqclass == 3) // reset
1228 {
1229 slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
1230 "probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
1231 send_reset (rsi);
1232 }
1233
1234 delete d;
1235 break;
1048 } 1236 }
1049 } 1237 }
1050 1238
1051 send_reset (rsi); 1239 send_reset (rsi);
1052 break; 1240 break;
… …
1054 case vpn_packet::PT_CONNECT_REQ: 1242 case vpn_packet::PT_CONNECT_REQ:
1055 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) 1243 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1056 { 1244 {
1057 connect_req_packet *p = (connect_req_packet *) pkt; 1245 connect_req_packet *p = (connect_req_packet *) pkt;
1058 1246
1059 assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything 1247 if (p->id > 0 && p->id <= vpn->conns.size ())
1060 connection *c = vpn->conns[p->id - 1];
1061 conf->protocols = p->protocols;
1062
1063 slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1064 conf->id, p->id, c->ictx && c->octx);
1065
1066 if (c->ictx && c->octx)
1067 { 1248 {
1249 connection *c = vpn->conns[p->id - 1];
1250 conf->protocols = p->protocols;
1251
1252 slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s) [%d]",
1253 conf->nodename, vpn->conns[p->id - 1]->conf->nodename, c->ictx && c->octx);
1254
1255 if (c->ictx && c->octx)
1256 {
1068 // send connect_info packets to both sides, in case one is 1257 // send connect_info packets to both sides, in case one is
1069 // behind a nat firewall (or both ;) 1258 // behind a nat firewall (or both ;)
1070 c->send_connect_info (conf->id, si, conf->protocols); 1259 c->send_connect_info (conf->id, si, conf->protocols);
1071 send_connect_info (c->conf->id, c->si, c->conf->protocols); 1260 send_connect_info (c->conf->id, c->si, c->conf->protocols);
1261 }
1262 else
1263 c->establish_connection ();
1072 } 1264 }
1073 else 1265 else
1074 c->establish_connection (); 1266 slog (L_WARN,
1267 _("received authenticated connection request from unknown node #%d, config file mismatch?"),
1268 p->id);
1075 } 1269 }
1076 1270
1077 break; 1271 break;
1078 1272
1079 case vpn_packet::PT_CONNECT_INFO: 1273 case vpn_packet::PT_CONNECT_INFO:
1080 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) 1274 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1081 { 1275 {
1082 connect_info_packet *p = (connect_info_packet *) pkt; 1276 connect_info_packet *p = (connect_info_packet *)pkt;
1083 1277
1084 assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything 1278 if (p->id > 0 && p->id <= vpn->conns.size ())
1085 1279 {
1086 connection *c = vpn->conns[p->id - 1]; 1280 connection *c = vpn->conns[p->id - 1];
1087 1281
1088 c->conf->protocols = p->protocols; 1282 c->conf->protocols = p->protocols;
1089 protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); 1283 protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1090 p->si.upgrade_protocol (protocol, c->conf); 1284 p->si.upgrade_protocol (protocol, c->conf);
1091 1285
1092 slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", 1286 slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s) [%d]",
1287 conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
1093 conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); 1288 (const char *)p->si, !c->ictx && !c->octx);
1094 1289
1095 const sockinfo &dsi = forward_si (p->si); 1290 const sockinfo &dsi = forward_si (p->si);
1096 1291
1097 if (dsi.valid ()) 1292 if (dsi.valid ())
1098 c->send_auth_request (dsi, true); 1293 c->send_auth_request (dsi, true);
1294 }
1295 else
1296 slog (L_WARN,
1297 _("received authenticated connection request from unknown node #%d, config file mismatch?"),
1298 p->id);
1099 } 1299 }
1100 1300
1101 break; 1301 break;
1102 1302
1103 default: 1303 default:
1104 send_reset (rsi); 1304 send_reset (rsi);
1105 break; 1305 break;
1106 } 1306 }
1107} 1307}
1108 1308
1109void connection::keepalive_cb (time_watcher &w) 1309inline void
1310connection::keepalive_cb (ev::timer &w, int revents)
1110{ 1311{
1111 if (NOW >= last_activity + ::conf.keepalive + 30) 1312 if (ev_now () >= last_activity + ::conf.keepalive + 30)
1112 { 1313 {
1113 reset_connection (); 1314 reset_connection ();
1114 establish_connection (); 1315 establish_connection ();
1115 } 1316 }
1116 else if (NOW < last_activity + ::conf.keepalive) 1317 else if (ev_now () < last_activity + ::conf.keepalive)
1117 w.start (last_activity + ::conf.keepalive); 1318 w.start (last_activity + ::conf.keepalive - ev::now ());
1118 else if (conf->connectmode != conf_node::C_ONDEMAND 1319 else if (conf->connectmode != conf_node::C_ONDEMAND
1119 || THISNODE->connectmode != conf_node::C_ONDEMAND) 1320 || THISNODE->connectmode != conf_node::C_ONDEMAND)
1120 { 1321 {
1121 send_ping (si); 1322 send_ping (si);
1122 w.start (NOW + 5); 1323 w.start (5);
1123 } 1324 }
1124 else if (NOW < last_activity + ::conf.keepalive + 10) 1325 else if (ev_now () < last_activity + ::conf.keepalive + 10)
1125 // hold ondemand connections implicitly a few seconds longer 1326 // hold ondemand connections implicitly a few seconds longer
1126 // should delete octx, though, or something like that ;) 1327 // should delete octx, though, or something like that ;)
1127 w.start (last_activity + ::conf.keepalive + 10); 1328 w.start (last_activity + ::conf.keepalive + 10 - ev::now ());
1128 else 1329 else
1129 reset_connection (); 1330 reset_connection ();
1130} 1331}
1131 1332
1132void connection::send_connect_request (int id) 1333void connection::send_connect_request (int id)
1133{ 1334{
1134 connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); 1335 connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);
1135 1336
1136 slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); 1337 slog (L_TRACE, "%s << PT_CONNECT_REQ(%s)",
1338 conf->nodename, vpn->conns[id - 1]->conf->nodename);
1137 p->hmac_set (octx); 1339 p->hmac_set (octx);
1138 send_vpn_packet (p, si); 1340 send_vpn_packet (p, si);
1139 1341
1140 delete p; 1342 delete p;
1141} 1343}
1142 1344
1345void connection::script_init_env (const char *ext)
1346{
1347 char *env;
1348 asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1349 asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1350 asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1351 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1352 conf->id & 0xff); putenv (env);
1353}
1354
1143void connection::script_node () 1355void connection::script_init_connect_env ()
1144{ 1356{
1145 vpn->script_if_up (); 1357 vpn->script_init_env ();
1146 1358
1147 char *env; 1359 char *env;
1148 asprintf (&env, "DESTID=%d", conf->id); putenv (env); 1360 asprintf (&env, "DESTID=%d", conf->id); putenv (env);
1149 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); 1361 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1150 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); 1362 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1151 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); 1363 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1152} 1364}
1153 1365
1366inline const char *
1154const char *connection::script_node_up () 1367connection::script_node_up ()
1155{ 1368{
1156 script_node (); 1369 script_init_connect_env ();
1157 1370
1158 putenv ("STATE=up"); 1371 putenv ((char *)"STATE=up");
1159 1372
1373 char *filename;
1374 asprintf (&filename,
1375 "%s/%s",
1376 confbase,
1160 return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; 1377 ::conf.script_node_up ? ::conf.script_node_up : "node-up");
1161}
1162 1378
1379 return filename;
1380}
1381
1382inline const char *
1163const char *connection::script_node_down () 1383connection::script_node_down ()
1164{ 1384{
1165 script_node (); 1385 script_init_connect_env ();
1166 1386
1167 putenv ("STATE=down"); 1387 putenv ((char *)"STATE=down");
1168 1388
1169 return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; 1389 char *filename;
1170} 1390 asprintf (&filename,
1391 "%s/%s",
1392 confbase,
1393 ::conf.script_node_down ? ::conf.script_node_down : "node-down");
1171 1394
1395 return filename;
1396}
1397
1172connection::connection(struct vpn *vpn_) 1398connection::connection (struct vpn *vpn, conf_node *conf)
1173: vpn(vpn_) 1399: vpn(vpn), conf(conf),
1174, rekey (this, &connection::rekey_cb) 1400#if ENABLE_DNS
1175, keepalive (this, &connection::keepalive_cb) 1401 dns (0),
1402#endif
1403 data_queue(conf->max_ttl, conf->max_queue + 1),
1404 vpn_queue(conf->max_ttl, conf->max_queue + 1)
1405{
1406 rekey .set<connection, &connection::rekey_cb > (this);
1407 keepalive .set<connection, &connection::keepalive_cb > (this);
1176, establish_connection (this, &connection::establish_connection_cb) 1408 establish_connection.set<connection, &connection::establish_connection_cb> (this);
1177{ 1409
1410 last_establish_attempt = 0.;
1178 octx = ictx = 0; 1411 octx = ictx = 0;
1179 retry_cnt = 0;
1180 1412
1181 connectmode = conf_node::C_ALWAYS; // initial setting 1413 if (!conf->protocols) // make sure some protocol is enabled
1414 conf->protocols = PROT_UDPv4;
1415
1416 connectmode = conf->connectmode;
1417
1418 // queue a dummy packet to force an initial connection attempt
1419 if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
1420 vpn_queue.put (new net_packet);
1421
1182 reset_connection (); 1422 reset_connection ();
1183} 1423}
1184 1424
1185connection::~connection () 1425connection::~connection ()
1186{ 1426{

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