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Comparing gvpe/src/connection.C (file contents):
Revision 1.44 by pcg, Fri Mar 4 08:15:04 2005 UTC vs.
Revision 1.87 by pcg, Fri Nov 12 18:39:33 2010 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 Marc Lehmann <gvpe@schmorp.de>
4 4
5 This file is part of GVPE. 5 This file is part of GVPE.
6 6
7 GVPE is free software; you can redistribute it and/or modify 7 GVPE is free software; you can redistribute it and/or modify it
8 it under the terms of the GNU General Public License as published by 8 under the terms of the GNU General Public License as published by the
9 the Free Software Foundation; either version 2 of the License, or 9 Free Software Foundation; either version 3 of the License, or (at your
10 (at your option) any later version. 10 option) any later version.
11 11
12 This program is distributed in the hope that it will be useful, 12 This program is distributed in the hope that it will be useful, but
13 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
15 GNU General Public License for more details. 15 Public License for more details.
16 16
17 You should have received a copy of the GNU General Public License 17 You should have received a copy of the GNU General Public License along
18 along with gvpe; if not, write to the Free Software 18 with this program; if not, see <http://www.gnu.org/licenses/>.
19 Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19
20 Additional permission under GNU GPL version 3 section 7
21
22 If you modify this Program, or any covered work, by linking or
23 combining it with the OpenSSL project's OpenSSL library (or a modified
24 version of that library), containing parts covered by the terms of the
25 OpenSSL or SSLeay licenses, the licensors of this Program grant you
26 additional permission to convey the resulting work. Corresponding
27 Source for a non-source form of such a combination shall include the
28 source code for the parts of OpenSSL used as well as that of the
29 covered work.
20*/ 30*/
21 31
22#include "config.h" 32#include "config.h"
23 33
24#include <cassert>
25
26#include <list> 34#include <list>
35#include <queue>
36#include <utility>
27 37
28#include <openssl/rand.h> 38#include <openssl/rand.h>
29#include <openssl/evp.h> 39#include <openssl/evp.h>
30#include <openssl/rsa.h> 40#include <openssl/rsa.h>
31#include <openssl/err.h> 41#include <openssl/err.h>
32
33#include "gettext.h"
34 42
35#include "conf.h" 43#include "conf.h"
36#include "slog.h" 44#include "slog.h"
37#include "device.h" 45#include "device.h"
38#include "vpn.h" 46#include "vpn.h"
… …
42 50
43#if !HAVE_RAND_PSEUDO_BYTES 51#if !HAVE_RAND_PSEUDO_BYTES
44# define RAND_pseudo_bytes RAND_bytes 52# define RAND_pseudo_bytes RAND_bytes
45#endif 53#endif
46 54
47#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic 55#define MAGIC_OLD "vped\xbd\xc6\xdb\x82" // 8 bytes of magic (still used in the protocol)
56#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic (understood but not generated)
48 57
49#define ULTRA_FAST 1 58#define ULTRA_FAST 1
50#define HLOG 15 59#define HLOG 15
51#include "lzf/lzf.h" 60#include "lzf/lzf.h"
52#include "lzf/lzf_c.c" 61#include "lzf/lzf_c.c"
53#include "lzf/lzf_d.c" 62#include "lzf/lzf_d.c"
63
64//////////////////////////////////////////////////////////////////////////////
65
66static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
67static ev::child rs_child_ev;
68
69void // c++ requires external linkage here, apparently :(
70rs_child_cb (ev::child &w, int revents)
71{
72 w.stop ();
73
74 if (rs_queue.empty ())
75 return;
76
77 pid_t pid = run_script (*rs_queue.front ().first, false);
78 if (pid)
79 {
80 w.set (pid);
81 w.start ();
82 }
83 else
84 slog (L_WARN, rs_queue.front ().second);
85
86 delete rs_queue.front ().first;
87 rs_queue.pop ();
88}
89
90// despite the fancy name, this is quite a hack
91static void
92run_script_queued (run_script_cb *cb, const char *warnmsg)
93{
94 rs_queue.push (std::make_pair (cb, warnmsg));
95
96 if (!rs_child_ev.is_active ())
97 {
98 rs_child_ev.set<rs_child_cb> ();
99 rs_child_ev ();
100 }
101}
102
103//////////////////////////////////////////////////////////////////////////////
54 104
55struct crypto_ctx 105struct crypto_ctx
56{ 106{
57 EVP_CIPHER_CTX cctx; 107 EVP_CIPHER_CTX cctx;
58 HMAC_CTX hctx; 108 HMAC_CTX hctx;
… …
86 require (EVP_DigestUpdate(&ctx, &id, sizeof id)); 136 require (EVP_DigestUpdate(&ctx, &id, sizeof id));
87 require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); 137 require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
88 EVP_MD_CTX_cleanup (&ctx); 138 EVP_MD_CTX_cleanup (&ctx);
89} 139}
90 140
91struct rsa_entry { 141struct rsa_entry
142{
92 tstamp expire; 143 tstamp expire;
93 rsaid id; 144 rsaid id;
94 rsachallenge chg; 145 rsachallenge chg;
95}; 146};
96 147
97struct rsa_cache : list<rsa_entry> 148struct rsa_cache : list<rsa_entry>
98{ 149{
99 void cleaner_cb (time_watcher &w); time_watcher cleaner; 150 inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;
100 151
101 bool find (const rsaid &id, rsachallenge &chg) 152 bool find (const rsaid &id, rsachallenge &chg)
102 { 153 {
103 for (iterator i = begin (); i != end (); ++i) 154 for (iterator i = begin (); i != end (); ++i)
104 { 155 {
105 if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) 156 if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ())
106 { 157 {
107 memcpy (&chg, &i->chg, sizeof chg); 158 memcpy (&chg, &i->chg, sizeof chg);
108 159
109 erase (i); 160 erase (i);
110 return true; 161 return true;
111 } 162 }
112 } 163 }
113 164
114 if (cleaner.at < NOW) 165 if (!cleaner.is_active ())
115 cleaner.start (NOW + RSA_TTL); 166 cleaner.again ();
116 167
117 return false; 168 return false;
118 } 169 }
119 170
120 void gen (rsaid &id, rsachallenge &chg) 171 void gen (rsaid &id, rsachallenge &chg)
121 { 172 {
122 rsa_entry e; 173 rsa_entry e;
123 174
124 RAND_bytes ((unsigned char *)&id, sizeof id); 175 RAND_bytes ((unsigned char *)&id, sizeof id);
125 RAND_bytes ((unsigned char *)&chg, sizeof chg); 176 RAND_bytes ((unsigned char *)&chg, sizeof chg);
126 177
127 e.expire = NOW + RSA_TTL; 178 e.expire = ev_now () + RSA_TTL;
128 e.id = id; 179 e.id = id;
129 memcpy (&e.chg, &chg, sizeof chg); 180 memcpy (&e.chg, &chg, sizeof chg);
130 181
131 push_back (e); 182 push_back (e);
132 183
133 if (cleaner.at < NOW) 184 if (!cleaner.is_active ())
134 cleaner.start (NOW + RSA_TTL); 185 cleaner.again ();
135 } 186 }
136 187
137 rsa_cache () 188 rsa_cache ()
138 : cleaner (this, &rsa_cache::cleaner_cb) 189 {
139 { } 190 cleaner.set<rsa_cache, &rsa_cache::cleaner_cb> (this);
191 cleaner.set (RSA_TTL, RSA_TTL);
192 }
140 193
141} rsa_cache; 194} rsa_cache;
142 195
143void rsa_cache::cleaner_cb (time_watcher &w) 196void rsa_cache::cleaner_cb (ev::timer &w, int revents)
144{ 197{
145 if (!empty ()) 198 if (empty ())
199 w.stop ();
200 else
146 { 201 {
147 w.start (NOW + RSA_TTL);
148
149 for (iterator i = begin (); i != end (); ) 202 for (iterator i = begin (); i != end (); )
150 if (i->expire <= NOW) 203 if (i->expire <= ev_now ())
151 i = erase (i); 204 i = erase (i);
152 else 205 else
153 ++i; 206 ++i;
154 } 207 }
155} 208}
156 209
157////////////////////////////////////////////////////////////////////////////// 210//////////////////////////////////////////////////////////////////////////////
158 211
159void pkt_queue::put (net_packet *p) 212pkt_queue::pkt_queue (double max_ttl, int max_queue)
213: max_ttl (max_ttl), max_queue (max_queue)
160{ 214{
161 if (queue[i]) 215 queue = new pkt [max_queue];
162 {
163 delete queue[i];
164 j = (j + 1) % QUEUEDEPTH;
165 }
166 216
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; 217 i = 0;
189 j = 0; 218 j = 0;
219
220 expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
190} 221}
191 222
192pkt_queue::~pkt_queue () 223pkt_queue::~pkt_queue ()
193{ 224{
194 for (i = QUEUEDEPTH; --i > 0; ) 225 while (net_packet *p = get ())
226 delete p;
227
195 delete queue[i]; 228 delete [] queue;
196} 229}
197 230
231void pkt_queue::expire_cb (ev::timer &w, int revents)
232{
233 ev_tstamp expire = ev_now () - max_ttl;
234
235 for (;;)
236 {
237 if (empty ())
238 break;
239
240 double diff = queue[j].tstamp - expire;
241
242 if (diff >= 0.)
243 {
244 w.start (diff > 0.5 ? diff : 0.5);
245 break;
246 }
247
248 delete get ();
249 }
250}
251
252void pkt_queue::put (net_packet *p)
253{
254 ev_tstamp now = ev_now ();
255
256 // start expiry timer
257 if (empty ())
258 expire.start (max_ttl);
259
260 int ni = i + 1 == max_queue ? 0 : i + 1;
261
262 if (ni == j)
263 delete get ();
264
265 queue[i].pkt = p;
266 queue[i].tstamp = now;
267
268 i = ni;
269}
270
271net_packet *pkt_queue::get ()
272{
273 if (empty ())
274 return 0;
275
276 net_packet *p = queue[j].pkt;
277 queue[j].pkt = 0;
278
279 j = j + 1 == max_queue ? 0 : j + 1;
280
281 return p;
282}
283
198struct net_rateinfo { 284struct net_rateinfo
285{
199 u32 host; 286 u32 host;
200 double pcnt, diff; 287 double pcnt, diff;
201 tstamp last; 288 tstamp last;
202}; 289};
203 290
… …
222 iterator i; 309 iterator i;
223 310
224 for (i = begin (); i != end (); ) 311 for (i = begin (); i != end (); )
225 if (i->host == host) 312 if (i->host == host)
226 break; 313 break;
227 else if (i->last < NOW - NRL_EXPIRE) 314 else if (i->last < ev_now () - NRL_EXPIRE)
228 i = erase (i); 315 i = erase (i);
229 else 316 else
230 i++; 317 i++;
231 318
232 if (i == end ()) 319 if (i == end ())
… …
234 net_rateinfo ri; 321 net_rateinfo ri;
235 322
236 ri.host = host; 323 ri.host = host;
237 ri.pcnt = 1.; 324 ri.pcnt = 1.;
238 ri.diff = NRL_MAXDIF; 325 ri.diff = NRL_MAXDIF;
239 ri.last = NOW; 326 ri.last = ev_now ();
240 327
241 push_front (ri); 328 push_front (ri);
242 329
243 return true; 330 return true;
244 } 331 }
… …
246 { 333 {
247 net_rateinfo ri (*i); 334 net_rateinfo ri (*i);
248 erase (i); 335 erase (i);
249 336
250 ri.pcnt = ri.pcnt * NRL_ALPHA; 337 ri.pcnt = ri.pcnt * NRL_ALPHA;
251 ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last); 338 ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
252 339
253 ri.last = NOW; 340 ri.last = ev_now ();
254 341
255 double dif = ri.diff / ri.pcnt; 342 double dif = ri.diff / ri.pcnt;
256 343
257 bool send = dif > NRL_CUTOFF; 344 bool send = dif > NRL_CUTOFF;
258 345
… …
338 ptype type = PT_DATA_UNCOMPRESSED; 425 ptype type = PT_DATA_UNCOMPRESSED;
339 426
340#if ENABLE_COMPRESSION 427#if ENABLE_COMPRESSION
341 u8 cdata[MAX_MTU]; 428 u8 cdata[MAX_MTU];
342 429
343 if (conn->features & ENABLE_COMPRESSION) 430 if (conn->features & FEATURE_COMPRESSION)
344 { 431 {
345 u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); 432 u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
346 433
347 if (cl) 434 if (cl)
348 { 435 {
… …
468 f |= FEATURE_COMPRESSION; 555 f |= FEATURE_COMPRESSION;
469#endif 556#endif
470#if ENABLE_ROHC 557#if ENABLE_ROHC
471 f |= FEATURE_ROHC; 558 f |= FEATURE_ROHC;
472#endif 559#endif
560#if ENABLE_BRIDGING
561 f |= FEATURE_BRIDGING;
562#endif
473 return f; 563 return f;
474 } 564 }
475}; 565};
476 566
477void config_packet::setup (ptype type, int dst) 567void config_packet::setup (ptype type, int dst)
478{ 568{
479 prot_major = PROTOCOL_MAJOR; 569 prot_major = PROTOCOL_MAJOR;
480 prot_minor = PROTOCOL_MINOR; 570 prot_minor = PROTOCOL_MINOR;
481 randsize = RAND_SIZE; 571 randsize = RAND_SIZE;
482 hmaclen = HMACLENGTH; 572 hmaclen = HMACLENGTH;
483 flags = ENABLE_COMPRESSION ? 0x81 : 0x80; 573 flags = 0;
484 challengelen = sizeof (rsachallenge); 574 challengelen = sizeof (rsachallenge);
485 features = get_features (); 575 features = get_features ();
486 576
487 cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); 577 cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
488 digest_nid = htonl (EVP_MD_type (RSA_HASH)); 578 digest_nid = htonl (EVP_MD_type (RSA_HASH));
… …
498 slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); 588 slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
499 else if (randsize != RAND_SIZE) 589 else if (randsize != RAND_SIZE)
500 slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); 590 slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
501 else if (hmaclen != HMACLENGTH) 591 else if (hmaclen != HMACLENGTH)
502 slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); 592 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)) 593 else if (challengelen != sizeof (rsachallenge))
508 slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); 594 slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
509 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) 595 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)); 596 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))) 597 else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
… …
528 rsaencrdata encr; 614 rsaencrdata encr;
529 615
530 auth_req_packet (int dst, bool initiate_, u8 protocols_) 616 auth_req_packet (int dst, bool initiate_, u8 protocols_)
531 { 617 {
532 config_packet::setup (PT_AUTH_REQ, dst); 618 config_packet::setup (PT_AUTH_REQ, dst);
533 strncpy (magic, MAGIC, 8); 619 strncpy (magic, MAGIC_OLD, 8);
534 initiate = !!initiate_; 620 initiate = !!initiate_;
535 protocols = protocols_; 621 protocols = protocols_;
536 622
537 len = sizeof (*this) - sizeof (net_packet); 623 len = sizeof (*this) - sizeof (net_packet);
538 } 624 }
… …
587///////////////////////////////////////////////////////////////////////////// 673/////////////////////////////////////////////////////////////////////////////
588 674
589void 675void
590connection::connection_established () 676connection::connection_established ()
591{ 677{
678 slog (L_NOISE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx);
679
592 if (ictx && octx) 680 if (ictx && octx)
593 { 681 {
594 connectmode = conf->connectmode;
595
596 // make sure rekeying timeouts are slightly asymmetric 682 // make sure rekeying timeouts are slightly asymmetric
597 rekey.start (NOW + ::conf.rekey 683 ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
598 + (conf->id > THISNODE->id ? 10 : 0)); 684 rekey.start (rekey_interval, rekey_interval);
599 keepalive.start (NOW + ::conf.keepalive); 685 keepalive.start (::conf.keepalive);
600 686
601 // send queued packets 687 // send queued packets
602 if (ictx && octx) 688 if (ictx && octx)
603 { 689 {
604 while (tap_packet *p = (tap_packet *)data_queue.get ()) 690 while (tap_packet *p = (tap_packet *)data_queue.get ())
605 { 691 {
606 send_data_packet (p); 692 if (p->len) send_data_packet (p);
607 delete p; 693 delete p;
608 } 694 }
609 695
610 while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) 696 while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
611 { 697 {
612 send_vpn_packet (p, si, IPTOS_RELIABILITY); 698 if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
613 delete p; 699 delete p;
614 } 700 }
615 } 701 }
702
703 vpn->connection_established (this);
616 } 704 }
617 else 705 else
618 { 706 {
619 retry_cnt = 0; 707 retry_cnt = 0;
620 establish_connection.start (NOW + 5); 708 establish_connection.start (5);
621 keepalive.stop (); 709 keepalive.stop ();
622 rekey.stop (); 710 rekey.stop ();
623 } 711 }
624} 712}
625 713
626void 714void
627connection::reset_si () 715connection::reset_si ()
628{ 716{
717 if (vpn->can_direct (THISNODE, conf))
629 protocol = best_protocol (THISNODE->protocols & conf->protocols); 718 protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
630 719 else
631 // mask out protocols we cannot establish 720 {
632 if (!conf->udp_port) protocol &= ~PROT_UDPv4; 721 slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
633 if (!conf->tcp_port) protocol &= ~PROT_TCPv4; 722 protocol = 0;
634 if (!conf->dns_port) protocol &= ~PROT_DNSv4; 723 }
635 724
636 si.set (conf, protocol); 725 si.set (conf, protocol);
726
727 is_direct = si.valid ();
637} 728}
638 729
639// ensure sockinfo is valid, forward if necessary 730// ensure sockinfo is valid, forward if necessary
640const sockinfo & 731const sockinfo &
641connection::forward_si (const sockinfo &si) const 732connection::forward_si (const sockinfo &si) const
642{ 733{
643 if (!si.valid ()) 734 if (!si.valid ())
644 { 735 {
645 connection *r = vpn->find_router (); 736 connection *r = vpn->find_router_for (this);
646 737
647 if (r) 738 if (r)
648 { 739 {
649 slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"), 740 slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
650 conf->nodename, r->conf->nodename); 741 conf->nodename, r->conf->nodename);
651 return r->si; 742 return r->si;
652 } 743 }
653 else 744 else
654 slog (L_DEBUG, _("%s: node unreachable, no common protocol"), 745 slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
655 conf->nodename); 746 conf->nodename);
656 } 747 }
657 748
658 return si; 749 return si;
659} 750}
660 751
661void 752void
662connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) 753connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
663{ 754{
664 bool ok; 755 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 (); 756 reset_connection ();
692} 757}
693 758
694void 759void
695connection::send_ping (const sockinfo &si, u8 pong) 760connection::send_ping (const sockinfo &si, u8 pong)
696{ 761{
697 ping_packet *pkt = new ping_packet; 762 ping_packet *pkt = new ping_packet;
698 763
699 pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); 764 pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
765
766 slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
767
700 send_vpn_packet (pkt, si, IPTOS_LOWDELAY); 768 send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
701 769
702 delete pkt; 770 delete pkt;
703} 771}
704 772
… …
723 791
724 rsachallenge chg; 792 rsachallenge chg;
725 rsa_cache.gen (pkt->id, chg); 793 rsa_cache.gen (pkt->id, chg);
726 rsa_encrypt (conf->rsa_key, chg, pkt->encr); 794 rsa_encrypt (conf->rsa_key, chg, pkt->encr);
727 795
728 slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); 796 slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
729 797
730 send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly 798 send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
731 799
732 delete pkt; 800 delete pkt;
733} 801}
… …
741 809
742 rsa_hash (id, chg, pkt->response); 810 rsa_hash (id, chg, pkt->response);
743 811
744 pkt->hmac_set (octx); 812 pkt->hmac_set (octx);
745 813
746 slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si); 814 slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
747 815
748 send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly 816 send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
749 817
750 delete pkt; 818 delete pkt;
751} 819}
752 820
753void 821void
754connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) 822connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
755{ 823{
756 slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", 824 slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s)", conf->nodename,
757 conf->id, rid, (const char *)rsi); 825 vpn->conns[rid - 1]->conf->nodename, (const char *)rsi);
758 826
759 connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); 827 connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
760 828
761 r->hmac_set (octx); 829 r->hmac_set (octx);
762 send_vpn_packet (r, si); 830 send_vpn_packet (r, si);
763 831
764 delete r; 832 delete r;
765} 833}
766 834
767void 835inline void
768connection::establish_connection_cb (time_watcher &w) 836connection::establish_connection_cb (ev::timer &w, int revents)
769{ 837{
770 if (!ictx 838 if (!ictx
771 && conf != THISNODE 839 && conf != THISNODE
772 && connectmode != conf_node::C_NEVER 840 && connectmode != conf_node::C_NEVER
773 && connectmode != conf_node::C_DISABLED 841 && connectmode != conf_node::C_DISABLED
774 && NOW > w.at) 842 && !w.is_active ())
775 { 843 {
776 double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; 844 // a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
777 845 // and stop trying. should probably be handled by a per-connection expire handler.
778 if (retry_int < conf->max_retry) 846 if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
847 {
848 reset_connection ();
779 retry_cnt++; 849 return;
780 else 850 }
781 retry_int = conf->max_retry;
782 851
783 w.start (NOW + retry_int); 852 last_establish_attempt = ev_now ();
853
854 ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
855 ? (retry_cnt & 3) + 1
856 : 1 << (retry_cnt >> 2));
784 857
785 reset_si (); 858 reset_si ();
786 859
787 if (si.prot && !si.host) 860 bool slow = si.prot & PROT_SLOW;
861
862 if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
863 {
864 /*TODO*/ /* start the timer so we don't recurse endlessly */
865 w.start (1);
788 vpn->send_connect_request (conf->id); 866 vpn->send_connect_request (this);
867 }
789 else 868 else
790 { 869 {
870 if (si.valid ())
871 slog (L_DEBUG, _("%s: sending direct connection request to %s."),
872 conf->nodename, (const char *)si);
873
791 const sockinfo &dsi = forward_si (si); 874 const sockinfo &dsi = forward_si (si);
875
876 slow = slow || (dsi.prot & PROT_SLOW);
792 877
793 if (dsi.valid () && auth_rate_limiter.can (dsi)) 878 if (dsi.valid () && auth_rate_limiter.can (dsi))
794 { 879 {
795 if (retry_cnt < 4) 880 if (retry_cnt < 4)
796 send_auth_request (dsi, true); 881 send_auth_request (dsi, true);
797 else 882 else
798 send_ping (dsi, 0); 883 send_ping (dsi, 0);
799 } 884 }
800 } 885 }
886
887 retry_int *= slow ? 8. : 0.9;
888
889 if (retry_int < conf->max_retry)
890 retry_cnt++;
891 else
892 retry_int = conf->max_retry;
893
894 w.start (retry_int);
801 } 895 }
802} 896}
803 897
804void 898void
805connection::reset_connection () 899connection::reset_connection ()
… …
808 { 902 {
809 slog (L_INFO, _("%s(%s): connection lost"), 903 slog (L_INFO, _("%s(%s): connection lost"),
810 conf->nodename, (const char *)si); 904 conf->nodename, (const char *)si);
811 905
812 if (::conf.script_node_down) 906 if (::conf.script_node_down)
813 run_script (run_script_cb (this, &connection::script_node_down), false); 907 {
908 run_script_cb *cb = new run_script_cb;
909 cb->set<connection, &connection::script_node_down> (this);
910 run_script_queued (cb, _("node-down command execution failed, continuing."));
911 }
814 } 912 }
815 913
816 delete ictx; ictx = 0; 914 delete ictx; ictx = 0;
817 delete octx; octx = 0; 915 delete octx; octx = 0;
818#if ENABLE_DNS 916#if ENABLE_DNS
819 delete dns; dns = 0; 917 dnsv4_reset_connection ();
820#endif 918#endif
821 919
822 si.host = 0; 920 si.host = 0;
823 921
824 last_activity = 0; 922 last_activity = 0.;
923 //last_si_change = 0.;
825 retry_cnt = 0; 924 retry_cnt = 0;
826 925
827 rekey.stop (); 926 rekey.stop ();
828 keepalive.stop (); 927 keepalive.stop ();
829 establish_connection.stop (); 928 establish_connection.stop ();
… …
836 send_reset (si); 935 send_reset (si);
837 936
838 reset_connection (); 937 reset_connection ();
839} 938}
840 939
841void 940// poor-man's rekeying
842connection::rekey_cb (time_watcher &w) 941inline void
942connection::rekey_cb (ev::timer &w, int revents)
843{ 943{
844 reset_connection (); 944 reset_connection ();
845 establish_connection (); 945 establish_connection ();
846} 946}
847 947
… …
863 if (oseqno > MAX_SEQNO) 963 if (oseqno > MAX_SEQNO)
864 rekey (); 964 rekey ();
865} 965}
866 966
867void 967void
968connection::post_inject_queue ()
969{
970 // force a connection every now and when when packets are sent (max 1/s)
971 if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
972 establish_connection.stop ();
973
974 establish_connection ();
975}
976
977void
868connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) 978connection::inject_data_packet (tap_packet *pkt)
869{ 979{
870 if (ictx && octx) 980 if (ictx && octx)
871 send_data_packet (pkt); 981 send_data_packet (pkt);
872 else 982 else
873 { 983 {
874 if (!broadcast)//DDDD
875 data_queue.put (new tap_packet (*pkt)); 984 data_queue.put (new tap_packet (*pkt));
876 985 post_inject_queue ();
877 establish_connection ();
878 } 986 }
879} 987}
880 988
881void connection::inject_vpn_packet (vpn_packet *pkt, int tos) 989void connection::inject_vpn_packet (vpn_packet *pkt, int tos)
882{ 990{
883 if (ictx && octx) 991 if (ictx && octx)
884 send_vpn_packet (pkt, si, tos); 992 send_vpn_packet (pkt, si, tos);
885 else 993 else
886 { 994 {
887 vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); 995 vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
888 996 post_inject_queue ();
889 establish_connection ();
890 } 997 }
891} 998}
892 999
893void 1000void
894connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) 1001connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
895{ 1002{
896 last_activity = NOW; 1003 last_activity = ev_now ();
897 1004
898 slog (L_NOISE, "<<%d received packet type %d from %d to %d", 1005 slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
899 conf->id, pkt->typ (), pkt->src (), pkt->dst ()); 1006 conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
1007
1008 if (connectmode == conf_node::C_DISABLED)
1009 return;
900 1010
901 switch (pkt->typ ()) 1011 switch (pkt->typ ())
902 { 1012 {
903 case vpn_packet::PT_PING: 1013 case vpn_packet::PT_PING:
1014 slog (L_TRACE, "%s >> PT_PING", conf->nodename);
1015
904 // we send pings instead of auth packets after some retries, 1016 // we send pings instead of auth packets after some retries,
905 // so reset the retry counter and establish a connection 1017 // so reset the retry counter and establish a connection
906 // when we receive a ping. 1018 // when we receive a ping.
907 if (!ictx) 1019 if (!(ictx && octx))
908 { 1020 {
909 if (auth_rate_limiter.can (rsi)) 1021 if (auth_rate_limiter.can (rsi))
910 send_auth_request (rsi, true); 1022 send_auth_request (rsi, true);
911 } 1023 }
912 else 1024 else
1025 // we would love to change thre socket address here, but ping's aren't
1026 // authenticated, so we best ignore it.
913 send_ping (rsi, 1); // pong 1027 send_ping (rsi, 1); // pong
914 1028
915 break; 1029 break;
916 1030
917 case vpn_packet::PT_PONG: 1031 case vpn_packet::PT_PONG:
1032 slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
918 break; 1033 break;
919 1034
920 case vpn_packet::PT_RESET: 1035 case vpn_packet::PT_RESET:
921 { 1036 {
922 reset_connection (); 1037 reset_connection ();
923 1038
924 config_packet *p = (config_packet *) pkt; 1039 config_packet *p = (config_packet *) pkt;
925 1040
926 if (!p->chk_config ()) 1041 if (!p->chk_config ())
927 { 1042 {
928 slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"), 1043 slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
929 conf->nodename, (const char *)rsi); 1044 conf->nodename, (const char *)rsi);
930 connectmode = conf_node::C_DISABLED; 1045 connectmode = conf_node::C_DISABLED;
931 } 1046 }
932 else if (connectmode == conf_node::C_ALWAYS) 1047 else if (connectmode == conf_node::C_ALWAYS)
933 establish_connection (); 1048 establish_connection ();
… …
937 case vpn_packet::PT_AUTH_REQ: 1052 case vpn_packet::PT_AUTH_REQ:
938 if (auth_rate_limiter.can (rsi)) 1053 if (auth_rate_limiter.can (rsi))
939 { 1054 {
940 auth_req_packet *p = (auth_req_packet *) pkt; 1055 auth_req_packet *p = (auth_req_packet *) pkt;
941 1056
942 slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate); 1057 slog (L_TRACE, "%s >> PT_AUTH_REQ(%s)", conf->nodename, p->initiate ? "initiate" : "reply");
943 1058
944 if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) 1059 if (p->chk_config ()
1060 && (!strncmp (p->magic, MAGIC_OLD, 8) || !strncmp (p->magic, MAGIC, 8)))
945 { 1061 {
946 if (p->prot_minor != PROTOCOL_MINOR) 1062 if (p->prot_minor != PROTOCOL_MINOR)
947 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), 1063 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
948 conf->nodename, (const char *)rsi, 1064 conf->nodename, (const char *)rsi,
949 PROTOCOL_MINOR, conf->nodename, p->prot_minor); 1065 PROTOCOL_MINOR, conf->nodename, p->prot_minor);
… …
964 delete octx; 1080 delete octx;
965 1081
966 octx = new crypto_ctx (k, 1); 1082 octx = new crypto_ctx (k, 1);
967 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; 1083 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;
968 1084
969 // compatibility code, remove when no longer required
970 if (p->flags & 1) p->features |= FEATURE_COMPRESSION;
971
972 conf->protocols = p->protocols; 1085 conf->protocols = p->protocols;
973 features = p->features & config_packet::get_features (); 1086 features = p->features & config_packet::get_features ();
974 1087
975 send_auth_response (rsi, p->id, k); 1088 send_auth_response (rsi, p->id, k);
976 1089
… …
978 1091
979 break; 1092 break;
980 } 1093 }
981 } 1094 }
982 else 1095 else
983 slog (L_WARN, _("%s(%s): protocol mismatch"), 1096 slog (L_WARN, _("%s(%s): protocol mismatch."),
984 conf->nodename, (const char *)rsi); 1097 conf->nodename, (const char *)rsi);
985 1098
986 send_reset (rsi); 1099 send_reset (rsi);
987 } 1100 }
988 1101
989 break; 1102 break;
990 1103
991 case vpn_packet::PT_AUTH_RES: 1104 case vpn_packet::PT_AUTH_RES:
992 { 1105 {
993 auth_res_packet *p = (auth_res_packet *) pkt; 1106 auth_res_packet *p = (auth_res_packet *)pkt;
994 1107
995 slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); 1108 slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
996 1109
997 if (p->chk_config ()) 1110 if (p->chk_config ())
998 { 1111 {
999 if (p->prot_minor != PROTOCOL_MINOR) 1112 if (p->prot_minor != PROTOCOL_MINOR)
1000 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), 1113 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
… …
1003 1116
1004 rsachallenge chg; 1117 rsachallenge chg;
1005 1118
1006 if (!rsa_cache.find (p->id, chg)) 1119 if (!rsa_cache.find (p->id, chg))
1007 { 1120 {
1008 slog (L_ERR, _("%s(%s): unrequested auth response ignored"), 1121 slog (L_ERR, _("%s(%s): unrequested auth response, ignoring."),
1009 conf->nodename, (const char *)rsi); 1122 conf->nodename, (const char *)rsi);
1010 break; 1123 break;
1011 } 1124 }
1012 else 1125 else
1013 { 1126 {
1014 crypto_ctx *cctx = new crypto_ctx (chg, 0); 1127 crypto_ctx *cctx = new crypto_ctx (chg, 0);
1015 1128
1016 if (!p->hmac_chk (cctx)) 1129 if (!p->hmac_chk (cctx))
1017 { 1130 {
1018 slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" 1131 slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
1019 "could be an attack, or just corruption or a synchronization error"), 1132 "could be an attack, or just corruption or a synchronization error."),
1020 conf->nodename, (const char *)rsi); 1133 conf->nodename, (const char *)rsi);
1021 break; 1134 break;
1022 } 1135 }
1023 else 1136 else
1024 { 1137 {
… …
1035 iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid 1148 iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1036 1149
1037 si = rsi; 1150 si = rsi;
1038 protocol = rsi.prot; 1151 protocol = rsi.prot;
1039 1152
1153 slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
1154 conf->nodename, (const char *)rsi,
1155 is_direct ? "direct" : "forwarded",
1156 p->prot_major, p->prot_minor);
1157
1040 connection_established (); 1158 connection_established ();
1041 1159
1042 slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1043 conf->nodename, (const char *)rsi,
1044 p->prot_major, p->prot_minor);
1045
1046 if (::conf.script_node_up) 1160 if (::conf.script_node_up)
1047 run_script (run_script_cb (this, &connection::script_node_up), false); 1161 {
1162 run_script_cb *cb = new run_script_cb;
1163 cb->set<connection, &connection::script_node_up> (this);
1164 run_script_queued (cb, _("node-up command execution failed, continuing."));
1165 }
1048 1166
1049 break; 1167 break;
1050 } 1168 }
1051 else 1169 else
1052 slog (L_ERR, _("%s(%s): sent and received challenge do not match"), 1170 slog (L_ERR, _("%s(%s): sent and received challenge do not match."),
1053 conf->nodename, (const char *)rsi); 1171 conf->nodename, (const char *)rsi);
1054 } 1172 }
1055 1173
1056 delete cctx; 1174 delete cctx;
1057 } 1175 }
… …
1073 { 1191 {
1074 vpndata_packet *p = (vpndata_packet *)pkt; 1192 vpndata_packet *p = (vpndata_packet *)pkt;
1075 1193
1076 if (!p->hmac_chk (ictx)) 1194 if (!p->hmac_chk (ictx))
1077 slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" 1195 slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1078 "could be an attack, or just corruption or a synchronization error"), 1196 "could be an attack, or just corruption or a synchronization error."),
1079 conf->nodename, (const char *)rsi); 1197 conf->nodename, (const char *)rsi);
1080 else 1198 else
1081 { 1199 {
1082 u32 seqno; 1200 u32 seqno;
1083 tap_packet *d = p->unpack (this, seqno); 1201 tap_packet *d = p->unpack (this, seqno);
1202 int seqclass = iseqno.seqno_classify (seqno);
1084 1203
1085 if (iseqno.recv_ok (seqno)) 1204 if (seqclass == 0) // ok
1086 { 1205 {
1087 vpn->tap->send (d); 1206 vpn->tap->send (d);
1088 1207
1089 if (si != rsi) 1208 if (si != rsi)
1090 { 1209 {
1091 // fast re-sync on connection changes, useful especially for tcp/ip 1210 // fast re-sync on source address changes, useful especially for tcp/ip
1211 //if (last_si_change < ev_now () + 5.)
1092 si = rsi; 1212 // {
1093
1094 slog (L_INFO, _("%s(%s): socket address changed to %s"), 1213 slog (L_INFO, _("%s(%s): changing socket address to %s."),
1095 conf->nodename, (const char *)si, (const char *)rsi); 1214 conf->nodename, (const char *)si, (const char *)rsi);
1215
1216 si = rsi;
1217
1218 if (::conf.script_node_change)
1219 {
1220 run_script_cb *cb = new run_script_cb;
1221 cb->set<connection, &connection::script_node_change> (this);
1222 run_script_queued (cb, _("node-change command execution failed, continuing."));
1223 }
1224
1225 // }
1226 //else
1227 // slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
1228 // conf->nodename, (const char *)si, (const char *)rsi);
1096 } 1229 }
1230 }
1231 else if (seqclass == 1) // far history
1232 slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
1233 "possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
1234 else if (seqclass == 2) // in-window duplicate, happens often on wireless
1235 slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
1236 "possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
1237 else if (seqclass == 3) // reset
1238 {
1239 slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
1240 "probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
1241 send_reset (rsi);
1097 } 1242 }
1098 1243
1099 delete d; 1244 delete d;
1100 break; 1245 break;
1101 } 1246 }
… …
1105 break; 1250 break;
1106 1251
1107 case vpn_packet::PT_CONNECT_REQ: 1252 case vpn_packet::PT_CONNECT_REQ:
1108 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) 1253 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1109 { 1254 {
1110 connect_req_packet *p = (connect_req_packet *) pkt; 1255 connect_req_packet *p = (connect_req_packet *)pkt;
1111 1256
1112 assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything 1257 if (p->id > 0 && p->id <= vpn->conns.size ())
1113 connection *c = vpn->conns[p->id - 1];
1114 conf->protocols = p->protocols;
1115
1116 slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1117 conf->id, p->id, c->ictx && c->octx);
1118
1119 if (c->ictx && c->octx)
1120 { 1258 {
1259 connection *c = vpn->conns[p->id - 1];
1260 conf->protocols = p->protocols;
1261
1262 slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s) [%d]",
1263 conf->nodename, vpn->conns[p->id - 1]->conf->nodename, c->ictx && c->octx);
1264
1265 if (c->ictx && c->octx)
1266 {
1121 // send connect_info packets to both sides, in case one is 1267 // send connect_info packets to both sides, in case one is
1122 // behind a nat firewall (or both ;) 1268 // behind a nat firewall (or both ;)
1123 c->send_connect_info (conf->id, si, conf->protocols); 1269 c->send_connect_info (conf->id, si, conf->protocols);
1124 send_connect_info (c->conf->id, c->si, c->conf->protocols); 1270 send_connect_info (c->conf->id, c->si, c->conf->protocols);
1271 }
1272 else
1273 c->establish_connection ();
1125 } 1274 }
1126 else 1275 else
1127 c->establish_connection (); 1276 slog (L_WARN,
1277 _("received authenticated connection request from unknown node #%d, config file mismatch?"),
1278 p->id);
1128 } 1279 }
1129 1280
1130 break; 1281 break;
1131 1282
1132 case vpn_packet::PT_CONNECT_INFO: 1283 case vpn_packet::PT_CONNECT_INFO:
1133 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) 1284 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1134 { 1285 {
1135 connect_info_packet *p = (connect_info_packet *)pkt; 1286 connect_info_packet *p = (connect_info_packet *)pkt;
1136 1287
1137 if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything 1288 if (p->id > 0 && p->id <= vpn->conns.size ())
1138 { 1289 {
1139 connection *c = vpn->conns[p->id - 1]; 1290 connection *c = vpn->conns[p->id - 1];
1140 1291
1141 c->conf->protocols = p->protocols; 1292 c->conf->protocols = p->protocols;
1142 protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); 1293 protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1143 p->si.upgrade_protocol (protocol, c->conf); 1294 p->si.upgrade_protocol (protocol, c->conf);
1144 1295
1145 slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", 1296 slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s) [%d]",
1297 conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
1146 conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); 1298 (const char *)p->si, !c->ictx && !c->octx);
1147 1299
1148 const sockinfo &dsi = forward_si (p->si); 1300 const sockinfo &dsi = forward_si (p->si);
1149 1301
1150 if (dsi.valid ()) 1302 if (dsi.valid ())
1151 c->send_auth_request (dsi, true); 1303 c->send_auth_request (dsi, true);
1152 } 1304 }
1305 else
1306 slog (L_WARN,
1307 _("received authenticated connection request from unknown node #%d, config file mismatch?"),
1308 p->id);
1153 } 1309 }
1154 1310
1155 break; 1311 break;
1156 1312
1157 default: 1313 default:
1158 send_reset (rsi); 1314 send_reset (rsi);
1159 break; 1315 break;
1160 } 1316 }
1161} 1317}
1162 1318
1163void connection::keepalive_cb (time_watcher &w) 1319inline void
1320connection::keepalive_cb (ev::timer &w, int revents)
1164{ 1321{
1165 if (NOW >= last_activity + ::conf.keepalive + 30) 1322 if (ev_now () >= last_activity + ::conf.keepalive + 15)
1166 { 1323 {
1167 reset_connection (); 1324 reset_connection ();
1168 establish_connection (); 1325 establish_connection ();
1169 } 1326 }
1170 else if (NOW < last_activity + ::conf.keepalive) 1327 else if (ev_now () < last_activity + ::conf.keepalive)
1171 w.start (last_activity + ::conf.keepalive); 1328 w.start (last_activity + ::conf.keepalive - ev::now ());
1172 else if (conf->connectmode != conf_node::C_ONDEMAND 1329 else if (conf->connectmode != conf_node::C_ONDEMAND
1173 || THISNODE->connectmode != conf_node::C_ONDEMAND) 1330 || THISNODE->connectmode != conf_node::C_ONDEMAND)
1174 { 1331 {
1175 send_ping (si); 1332 send_ping (si);
1176 w.start (NOW + 5); 1333 w.start (3);
1177 } 1334 }
1178 else if (NOW < last_activity + ::conf.keepalive + 10) 1335 else if (ev_now () < last_activity + ::conf.keepalive + 10)
1179 // hold ondemand connections implicitly a few seconds longer 1336 // hold ondemand connections implicitly a few seconds longer
1180 // should delete octx, though, or something like that ;) 1337 // should delete octx, though, or something like that ;)
1181 w.start (last_activity + ::conf.keepalive + 10); 1338 w.start (last_activity + ::conf.keepalive + 10 - ev::now ());
1182 else 1339 else
1183 reset_connection (); 1340 reset_connection ();
1184} 1341}
1185 1342
1186void connection::send_connect_request (int id) 1343void connection::send_connect_request (int id)
1187{ 1344{
1188 connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); 1345 connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);
1189 1346
1190 slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); 1347 slog (L_TRACE, "%s << PT_CONNECT_REQ(%s)",
1348 conf->nodename, vpn->conns[id - 1]->conf->nodename);
1191 p->hmac_set (octx); 1349 p->hmac_set (octx);
1192 send_vpn_packet (p, si); 1350 send_vpn_packet (p, si);
1193 1351
1194 delete p; 1352 delete p;
1195} 1353}
1196 1354
1197void connection::script_node () 1355void connection::script_init_env (const char *ext)
1198{ 1356{
1199 vpn->script_if_up ();
1200
1201 char *env; 1357 char *env;
1358 asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1359 asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1360 asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1361 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1362 conf->id & 0xff); putenv (env);
1363}
1364
1365void connection::script_init_connect_env ()
1366{
1367 vpn->script_init_env ();
1368
1369 char *env;
1202 asprintf (&env, "DESTID=%d", conf->id); putenv (env); 1370 asprintf (&env, "DESTID=%d", conf->id); putenv (env);
1371 asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1203 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); 1372 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1204 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); 1373 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1205 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); 1374 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1206} 1375}
1207 1376
1377inline const char *
1208const char *connection::script_node_up () 1378connection::script_node_up ()
1209{ 1379{
1210 script_node (); 1380 script_init_connect_env ();
1211 1381
1212 putenv ("STATE=up"); 1382 putenv ((char *)"STATE=up");
1213 1383
1384 char *filename;
1385 asprintf (&filename,
1386 "%s/%s",
1387 confbase,
1214 return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; 1388 ::conf.script_node_up ? ::conf.script_node_up : "node-up");
1215}
1216 1389
1390 return filename;
1391}
1392
1393inline const char *
1394connection::script_node_change ()
1395{
1396 script_init_connect_env ();
1397
1398 putenv ((char *)"STATE=change");
1399
1400 char *filename;
1401 asprintf (&filename,
1402 "%s/%s",
1403 confbase,
1404 ::conf.script_node_change ? ::conf.script_node_change : "node-change");
1405
1406 return filename;
1407}
1408
1409inline const char *
1217const char *connection::script_node_down () 1410connection::script_node_down ()
1218{ 1411{
1219 script_node (); 1412 script_init_connect_env ();
1220 1413
1221 putenv ("STATE=down"); 1414 putenv ((char *)"STATE=down");
1222 1415
1223 return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; 1416 char *filename;
1417 asprintf (&filename,
1418 "%s/%s",
1419 confbase,
1420 ::conf.script_node_down ? ::conf.script_node_down : "node-down");
1421
1422 return filename;
1224} 1423}
1225 1424
1226connection::connection (struct vpn *vpn, conf_node *conf) 1425connection::connection (struct vpn *vpn, conf_node *conf)
1227: vpn(vpn), conf(conf) 1426: vpn(vpn), conf(conf),
1228, rekey (this, &connection::rekey_cb)
1229, keepalive (this, &connection::keepalive_cb)
1230, establish_connection (this, &connection::establish_connection_cb)
1231#if ENABLE_DNS 1427#if ENABLE_DNS
1232, dns (0) 1428 dns (0),
1233#endif 1429#endif
1430 data_queue(conf->max_ttl, conf->max_queue + 1),
1431 vpn_queue(conf->max_ttl, conf->max_queue + 1)
1234{ 1432{
1433 rekey .set<connection, &connection::rekey_cb > (this);
1434 keepalive .set<connection, &connection::keepalive_cb > (this);
1435 establish_connection.set<connection, &connection::establish_connection_cb> (this);
1436
1437 last_establish_attempt = 0.;
1235 octx = ictx = 0; 1438 octx = ictx = 0;
1236 retry_cnt = 0;
1237 1439
1238 if (!conf->protocols) // make sure some protocol is enabled 1440 if (!conf->protocols) // make sure some protocol is enabled
1239 conf->protocols = PROT_UDPv4; 1441 conf->protocols = PROT_UDPv4;
1240 1442
1241 connectmode = conf_node::C_ALWAYS; // initial setting 1443 connectmode = conf->connectmode;
1444
1445 // queue a dummy packet to force an initial connection attempt
1446 if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
1447 vpn_queue.put (new net_packet);
1448
1242 reset_connection (); 1449 reset_connection ();
1243} 1450}
1244 1451
1245connection::~connection () 1452connection::~connection ()
1246{ 1453{

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