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Comparing gvpe/src/connection.C (file contents):
Revision 1.35 by pcg, Mon May 10 21:24:48 2004 UTC vs.
Revision 1.67 by pcg, Thu Aug 7 16:34:21 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) 2003-2005 Marc Lehmann <gvpe@schmorp.de>
4 4
5 This file is part of GVPE.
6
5 This program is free software; you can redistribute it and/or modify 7 GVPE is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by 8 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or 9 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version. 10 (at your option) any later version.
9 11
10 This program is distributed in the hope that it will be useful, 12 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details. 15 GNU General Public License for more details.
14 16
15 You should have received a copy of the GNU General Public License 17 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software 18 along with gvpe; if not, write to the Free Software
17 Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18*/ 20*/
19 21
20#include "config.h" 22#include "config.h"
21
22#include <cassert>
23 23
24#include <list> 24#include <list>
25 25
26#include <openssl/rand.h> 26#include <openssl/rand.h>
27#include <openssl/evp.h> 27#include <openssl/evp.h>
28#include <openssl/rsa.h> 28#include <openssl/rsa.h>
29#include <openssl/err.h> 29#include <openssl/err.h>
30
31#include "gettext.h"
32 30
33#include "conf.h" 31#include "conf.h"
34#include "slog.h" 32#include "slog.h"
35#include "device.h" 33#include "device.h"
36#include "vpn.h" 34#include "vpn.h"
… …
84 require (EVP_DigestUpdate(&ctx, &id, sizeof id)); 82 require (EVP_DigestUpdate(&ctx, &id, sizeof id));
85 require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); 83 require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
86 EVP_MD_CTX_cleanup (&ctx); 84 EVP_MD_CTX_cleanup (&ctx);
87} 85}
88 86
89struct rsa_entry { 87struct rsa_entry
88{
90 tstamp expire; 89 tstamp expire;
91 rsaid id; 90 rsaid id;
92 rsachallenge chg; 91 rsachallenge chg;
93}; 92};
94 93
95struct rsa_cache : list<rsa_entry> 94struct rsa_cache : list<rsa_entry>
96{ 95{
97 void cleaner_cb (time_watcher &w); time_watcher cleaner; 96 inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;
98 97
99 bool find (const rsaid &id, rsachallenge &chg) 98 bool find (const rsaid &id, rsachallenge &chg)
100 { 99 {
101 for (iterator i = begin (); i != end (); ++i) 100 for (iterator i = begin (); i != end (); ++i)
102 { 101 {
103 if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) 102 if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ())
104 { 103 {
105 memcpy (&chg, &i->chg, sizeof chg); 104 memcpy (&chg, &i->chg, sizeof chg);
106 105
107 erase (i); 106 erase (i);
108 return true; 107 return true;
109 } 108 }
110 } 109 }
111 110
112 if (cleaner.at < NOW) 111 if (!cleaner.is_active ())
113 cleaner.start (NOW + RSA_TTL); 112 cleaner.again ();
114 113
115 return false; 114 return false;
116 } 115 }
117 116
118 void gen (rsaid &id, rsachallenge &chg) 117 void gen (rsaid &id, rsachallenge &chg)
119 { 118 {
120 rsa_entry e; 119 rsa_entry e;
121 120
122 RAND_bytes ((unsigned char *)&id, sizeof id); 121 RAND_bytes ((unsigned char *)&id, sizeof id);
123 RAND_bytes ((unsigned char *)&chg, sizeof chg); 122 RAND_bytes ((unsigned char *)&chg, sizeof chg);
124 123
125 e.expire = NOW + RSA_TTL; 124 e.expire = ev_now () + RSA_TTL;
126 e.id = id; 125 e.id = id;
127 memcpy (&e.chg, &chg, sizeof chg); 126 memcpy (&e.chg, &chg, sizeof chg);
128 127
129 push_back (e); 128 push_back (e);
130 129
131 if (cleaner.at < NOW) 130 if (!cleaner.is_active ())
132 cleaner.start (NOW + RSA_TTL); 131 cleaner.again ();
133 } 132 }
134 133
135 rsa_cache () 134 rsa_cache ()
136 : cleaner (this, &rsa_cache::cleaner_cb) 135 {
137 { } 136 cleaner.set<rsa_cache, &rsa_cache::cleaner_cb> (this);
137 cleaner.set (RSA_TTL, RSA_TTL);
138 }
138 139
139} rsa_cache; 140} rsa_cache;
140 141
141void rsa_cache::cleaner_cb (time_watcher &w) 142void rsa_cache::cleaner_cb (ev::timer &w, int revents)
142{ 143{
143 if (!empty ()) 144 if (empty ())
145 w.stop ();
146 else
144 { 147 {
145 w.start (NOW + RSA_TTL);
146
147 for (iterator i = begin (); i != end (); ) 148 for (iterator i = begin (); i != end (); )
148 if (i->expire <= NOW) 149 if (i->expire <= ev_now ())
149 i = erase (i); 150 i = erase (i);
150 else 151 else
151 ++i; 152 ++i;
152 } 153 }
153} 154}
154 155
155////////////////////////////////////////////////////////////////////////////// 156//////////////////////////////////////////////////////////////////////////////
156 157
157void pkt_queue::put (net_packet *p) 158pkt_queue::pkt_queue (double max_ttl, int max_queue)
159: max_ttl (max_ttl), max_queue (max_queue)
158{ 160{
159 if (queue[i]) 161 queue = new pkt [max_queue];
160 {
161 delete queue[i];
162 j = (j + 1) % QUEUEDEPTH;
163 }
164 162
165 queue[i] = p;
166
167 i = (i + 1) % QUEUEDEPTH;
168}
169
170net_packet *pkt_queue::get ()
171{
172 net_packet *p = queue[j];
173
174 if (p)
175 {
176 queue[j] = 0;
177 j = (j + 1) % QUEUEDEPTH;
178 }
179
180 return p;
181}
182
183pkt_queue::pkt_queue ()
184{
185 memset (queue, 0, sizeof (queue));
186 i = 0; 163 i = 0;
187 j = 0; 164 j = 0;
165
166 expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
188} 167}
189 168
190pkt_queue::~pkt_queue () 169pkt_queue::~pkt_queue ()
191{ 170{
192 for (i = QUEUEDEPTH; --i > 0; ) 171 while (net_packet *p = get ())
172 delete p;
173
193 delete queue[i]; 174 delete [] queue;
194} 175}
195 176
177void pkt_queue::expire_cb (ev::timer &w, int revents)
178{
179 ev_tstamp expire = ev_now () - max_ttl;
180
181 for (;;)
182 {
183 if (empty ())
184 break;
185
186 double diff = queue[j].tstamp - expire;
187
188 if (diff >= 0.)
189 {
190 w.start (diff > 0.5 ? diff : 0.5);
191 break;
192 }
193
194 delete get ();
195 }
196}
197
198void pkt_queue::put (net_packet *p)
199{
200 ev_tstamp now = ev_now ();
201
202 // start expiry timer
203 if (empty ())
204 expire.start (max_ttl);
205
206 int ni = i + 1 == max_queue ? 0 : i + 1;
207
208 if (ni == j)
209 delete get ();
210
211 queue[i].pkt = p;
212 queue[i].tstamp = now;
213
214 i = ni;
215}
216
217net_packet *pkt_queue::get ()
218{
219 if (empty ())
220 return 0;
221
222 net_packet *p = queue[j].pkt;
223 queue[j].pkt = 0;
224
225 j = j + 1 == max_queue ? 0 : j + 1;
226
227 return p;
228}
229
196struct net_rateinfo { 230struct net_rateinfo
231{
197 u32 host; 232 u32 host;
198 double pcnt, diff; 233 double pcnt, diff;
199 tstamp last; 234 tstamp last;
200}; 235};
201 236
… …
220 iterator i; 255 iterator i;
221 256
222 for (i = begin (); i != end (); ) 257 for (i = begin (); i != end (); )
223 if (i->host == host) 258 if (i->host == host)
224 break; 259 break;
225 else if (i->last < NOW - NRL_EXPIRE) 260 else if (i->last < ev_now () - NRL_EXPIRE)
226 i = erase (i); 261 i = erase (i);
227 else 262 else
228 i++; 263 i++;
229 264
230 if (i == end ()) 265 if (i == end ())
… …
232 net_rateinfo ri; 267 net_rateinfo ri;
233 268
234 ri.host = host; 269 ri.host = host;
235 ri.pcnt = 1.; 270 ri.pcnt = 1.;
236 ri.diff = NRL_MAXDIF; 271 ri.diff = NRL_MAXDIF;
237 ri.last = NOW; 272 ri.last = ev_now ();
238 273
239 push_front (ri); 274 push_front (ri);
240 275
241 return true; 276 return true;
242 } 277 }
… …
244 { 279 {
245 net_rateinfo ri (*i); 280 net_rateinfo ri (*i);
246 erase (i); 281 erase (i);
247 282
248 ri.pcnt = ri.pcnt * NRL_ALPHA; 283 ri.pcnt = ri.pcnt * NRL_ALPHA;
249 ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last); 284 ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
250 285
251 ri.last = NOW; 286 ri.last = ev_now ();
252 287
253 double dif = ri.diff / ri.pcnt; 288 double dif = ri.diff / ri.pcnt;
254 289
255 bool send = dif > NRL_CUTOFF; 290 bool send = dif > NRL_CUTOFF;
256 291
… …
466 f |= FEATURE_COMPRESSION; 501 f |= FEATURE_COMPRESSION;
467#endif 502#endif
468#if ENABLE_ROHC 503#if ENABLE_ROHC
469 f |= FEATURE_ROHC; 504 f |= FEATURE_ROHC;
470#endif 505#endif
506#if ENABLE_BRIDGING
507 f |= FEATURE_BRIDGING;
508#endif
471 return f; 509 return f;
472 } 510 }
473}; 511};
474 512
475void config_packet::setup (ptype type, int dst) 513void config_packet::setup (ptype type, int dst)
476{ 514{
477 prot_major = PROTOCOL_MAJOR; 515 prot_major = PROTOCOL_MAJOR;
478 prot_minor = PROTOCOL_MINOR; 516 prot_minor = PROTOCOL_MINOR;
479 randsize = RAND_SIZE; 517 randsize = RAND_SIZE;
480 hmaclen = HMACLENGTH; 518 hmaclen = HMACLENGTH;
481 flags = ENABLE_COMPRESSION ? 0x81 : 0x80; 519 flags = 0;
482 challengelen = sizeof (rsachallenge); 520 challengelen = sizeof (rsachallenge);
483 features = get_features (); 521 features = get_features ();
484 522
485 cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); 523 cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
486 digest_nid = htonl (EVP_MD_type (RSA_HASH)); 524 digest_nid = htonl (EVP_MD_type (RSA_HASH));
… …
496 slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); 534 slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
497 else if (randsize != RAND_SIZE) 535 else if (randsize != RAND_SIZE)
498 slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); 536 slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
499 else if (hmaclen != HMACLENGTH) 537 else if (hmaclen != HMACLENGTH)
500 slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); 538 slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
501#if 0 // this implementation should handle all flag settings
502 else if (flags != curflags ())
503 slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
504#endif
505 else if (challengelen != sizeof (rsachallenge)) 539 else if (challengelen != sizeof (rsachallenge))
506 slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); 540 slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
507 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) 541 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
508 slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); 542 slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));
509 else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) 543 else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
… …
585///////////////////////////////////////////////////////////////////////////// 619/////////////////////////////////////////////////////////////////////////////
586 620
587void 621void
588connection::connection_established () 622connection::connection_established ()
589{ 623{
624 slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx);
625
590 if (ictx && octx) 626 if (ictx && octx)
591 { 627 {
592 connectmode = conf->connectmode; 628 // make sure rekeying timeouts are slightly asymmetric
593 629 ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
594 rekey.start (NOW + ::conf.rekey); 630 rekey.start (rekey_interval, rekey_interval);
595 keepalive.start (NOW + ::conf.keepalive); 631 keepalive.start (::conf.keepalive);
596 632
597 // send queued packets 633 // send queued packets
598 if (ictx && octx) 634 if (ictx && octx)
599 { 635 {
600 while (tap_packet *p = (tap_packet *)data_queue.get ()) 636 while (tap_packet *p = (tap_packet *)data_queue.get ())
601 { 637 {
602 send_data_packet (p); 638 if (p->len) send_data_packet (p);
603 delete p; 639 delete p;
604 } 640 }
605 641
606 while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) 642 while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
607 { 643 {
608 send_vpn_packet (p, si, IPTOS_RELIABILITY); 644 if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
609 delete p; 645 delete p;
610 } 646 }
611 } 647 }
612 } 648 }
613 else 649 else
614 { 650 {
615 retry_cnt = 0; 651 retry_cnt = 0;
616 establish_connection.start (NOW + 5); 652 establish_connection.start (5);
617 keepalive.stop (); 653 keepalive.stop ();
618 rekey.stop (); 654 rekey.stop ();
619 } 655 }
620} 656}
621 657
… …
625 protocol = best_protocol (THISNODE->protocols & conf->protocols); 661 protocol = best_protocol (THISNODE->protocols & conf->protocols);
626 662
627 // mask out protocols we cannot establish 663 // mask out protocols we cannot establish
628 if (!conf->udp_port) protocol &= ~PROT_UDPv4; 664 if (!conf->udp_port) protocol &= ~PROT_UDPv4;
629 if (!conf->tcp_port) protocol &= ~PROT_TCPv4; 665 if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
666 if (!conf->dns_port) protocol &= ~PROT_DNSv4;
667
668 if (protocol
669 && (!conf->can_direct (THISNODE)
670 || !THISNODE->can_direct (conf)))
671 {
672 slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename);
673 protocol = 0;
674 }
630 675
631 si.set (conf, protocol); 676 si.set (conf, protocol);
632} 677}
633 678
634// ensure sockinfo is valid, forward if necessary 679// ensure sockinfo is valid, forward if necessary
… …
639 { 684 {
640 connection *r = vpn->find_router (); 685 connection *r = vpn->find_router ();
641 686
642 if (r) 687 if (r)
643 { 688 {
644 slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"), 689 slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),
645 conf->nodename, r->conf->nodename); 690 conf->nodename, r->conf->nodename, (const char *)r->si);
646 return r->si; 691 return r->si;
647 } 692 }
648 else 693 else
649 slog (L_DEBUG, _("%s: node unreachable, no common protocol"), 694 slog (L_DEBUG, _("%s: node unreachable, no common protocol"),
650 conf->nodename); 695 conf->nodename);
… …
720} 765}
721 766
722void 767void
723connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) 768connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
724{ 769{
725 slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", 770 slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)",
726 conf->id, rid, (const char *)rsi); 771 conf->id, rid, (const char *)rsi);
727 772
728 connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); 773 connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
729 774
730 r->hmac_set (octx); 775 r->hmac_set (octx);
731 send_vpn_packet (r, si); 776 send_vpn_packet (r, si);
732 777
733 delete r; 778 delete r;
734} 779}
735 780
736void 781inline void
737connection::establish_connection_cb (time_watcher &w) 782connection::establish_connection_cb (ev::timer &w, int revents)
738{ 783{
739 if (!ictx 784 if (!ictx
740 && conf != THISNODE 785 && conf != THISNODE
741 && connectmode != conf_node::C_NEVER 786 && connectmode != conf_node::C_NEVER
742 && connectmode != conf_node::C_DISABLED 787 && connectmode != conf_node::C_DISABLED
743 && NOW > w.at) 788 && !w.is_active ())
744 { 789 {
745 double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; 790 // a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
746 791 // and stop trying. should probably be handled by a per-connection expire handler.
747 if (retry_int < 3600 * 8) 792 if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
793 {
794 reset_connection ();
748 retry_cnt++; 795 return;
796 }
749 797
750 w.start (NOW + retry_int); 798 ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
799 ? (retry_cnt & 3) + 1
800 : 1 << (retry_cnt >> 2));
751 801
752 reset_si (); 802 reset_si ();
753 803
804 bool slow = si.prot & PROT_SLOW;
805
754 if (si.prot && !si.host) 806 if (si.prot && !si.host)
807 {
808 slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename);
809 /*TODO*/ /* start the timer so we don't recurse endlessly */
810 w.start (1);
755 vpn->send_connect_request (conf->id); 811 vpn->send_connect_request (conf->id);
812 }
756 else 813 else
757 { 814 {
815 slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx);
816
758 const sockinfo &dsi = forward_si (si); 817 const sockinfo &dsi = forward_si (si);
818
819 slow = slow || (dsi.prot & PROT_SLOW);
759 820
760 if (dsi.valid () && auth_rate_limiter.can (dsi)) 821 if (dsi.valid () && auth_rate_limiter.can (dsi))
761 { 822 {
762 if (retry_cnt < 4) 823 if (retry_cnt < 4)
763 send_auth_request (dsi, true); 824 send_auth_request (dsi, true);
764 else 825 else
765 send_ping (dsi, 0); 826 send_ping (dsi, 0);
766 } 827 }
767 } 828 }
829
830 retry_int *= slow ? 8. : 0.7;
831
832 if (retry_int < conf->max_retry)
833 retry_cnt++;
834 else
835 retry_int = conf->max_retry;
836
837 w.start (retry_int);
768 } 838 }
769} 839}
770 840
771void 841void
772connection::reset_connection () 842connection::reset_connection ()
… …
775 { 845 {
776 slog (L_INFO, _("%s(%s): connection lost"), 846 slog (L_INFO, _("%s(%s): connection lost"),
777 conf->nodename, (const char *)si); 847 conf->nodename, (const char *)si);
778 848
779 if (::conf.script_node_down) 849 if (::conf.script_node_down)
780 run_script (run_script_cb (this, &connection::script_node_down), false); 850 {
851 run_script_cb cb;
852 cb.set<connection, &connection::script_node_down> (this);
853 if (!run_script (cb, false))
854 slog (L_WARN, _("node-down command execution failed, continuing."));
855 }
781 } 856 }
782 857
783 delete ictx; ictx = 0; 858 delete ictx; ictx = 0;
784 delete octx; octx = 0; 859 delete octx; octx = 0;
860#if ENABLE_DNS
861 dnsv4_reset_connection ();
862#endif
785 863
786 si.host= 0; 864 si.host = 0;
787 865
788 last_activity = 0; 866 last_activity = 0;
789 retry_cnt = 0; 867 retry_cnt = 0;
790 868
791 rekey.stop (); 869 rekey.stop ();
… …
800 send_reset (si); 878 send_reset (si);
801 879
802 reset_connection (); 880 reset_connection ();
803} 881}
804 882
805void 883inline void
806connection::rekey_cb (time_watcher &w) 884connection::rekey_cb (ev::timer &w, int revents)
807{ 885{
808 reset_connection (); 886 reset_connection ();
809 establish_connection (); 887 establish_connection ();
810} 888}
811 889
… …
833{ 911{
834 if (ictx && octx) 912 if (ictx && octx)
835 send_data_packet (pkt); 913 send_data_packet (pkt);
836 else 914 else
837 { 915 {
838 if (!broadcast)//DDDD 916 if (!broadcast)
839 data_queue.put (new tap_packet (*pkt)); 917 data_queue.put (new tap_packet (*pkt));
840 918
841 establish_connection (); 919 establish_connection ();
842 } 920 }
843} 921}
… …
855} 933}
856 934
857void 935void
858connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) 936connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
859{ 937{
860 last_activity = NOW; 938 last_activity = ev_now ();
861 939
862 slog (L_NOISE, "<<%d received packet type %d from %d to %d", 940 slog (L_NOISE, "<<%d received packet type %d from %d to %d",
863 conf->id, pkt->typ (), pkt->src (), pkt->dst ()); 941 conf->id, pkt->typ (), pkt->src (), pkt->dst ());
942
943 if (connectmode == conf_node::C_DISABLED)
944 return;
864 945
865 switch (pkt->typ ()) 946 switch (pkt->typ ())
866 { 947 {
867 case vpn_packet::PT_PING: 948 case vpn_packet::PT_PING:
868 // we send pings instead of auth packets after some retries, 949 // we send pings instead of auth packets after some retries,
… …
928 delete octx; 1009 delete octx;
929 1010
930 octx = new crypto_ctx (k, 1); 1011 octx = new crypto_ctx (k, 1);
931 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; 1012 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;
932 1013
933 // compatibility code, remove when no longer required
934 if (p->flags & 1) p->features |= FEATURE_COMPRESSION;
935
936 conf->protocols = p->protocols; 1014 conf->protocols = p->protocols;
937 features = p->features & config_packet::get_features (); 1015 features = p->features & config_packet::get_features ();
938 1016
939 send_auth_response (rsi, p->id, k); 1017 send_auth_response (rsi, p->id, k);
940 1018
… …
1006 slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), 1084 slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1007 conf->nodename, (const char *)rsi, 1085 conf->nodename, (const char *)rsi,
1008 p->prot_major, p->prot_minor); 1086 p->prot_major, p->prot_minor);
1009 1087
1010 if (::conf.script_node_up) 1088 if (::conf.script_node_up)
1011 run_script (run_script_cb (this, &connection::script_node_up), false); 1089 {
1090 run_script_cb cb;
1091 cb.set<connection, &connection::script_node_up> (this);
1092 if (!run_script (cb, false))
1093 slog (L_WARN, _("node-up command execution failed, continuing."));
1094 }
1012 1095
1013 break; 1096 break;
1014 } 1097 }
1015 else 1098 else
1016 slog (L_ERR, _("%s(%s): sent and received challenge do not match"), 1099 slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
… …
1050 { 1133 {
1051 vpn->tap->send (d); 1134 vpn->tap->send (d);
1052 1135
1053 if (si != rsi) 1136 if (si != rsi)
1054 { 1137 {
1055 // fast re-sync on connection changes, useful especially for tcp/ip 1138 // fast re-sync on source address changes, useful especially for tcp/ip
1056 si = rsi; 1139 si = rsi;
1057 1140
1058 slog (L_INFO, _("%s(%s): socket address changed to %s"), 1141 slog (L_INFO, _("%s(%s): socket address changed to %s"),
1059 conf->nodename, (const char *)si, (const char *)rsi); 1142 conf->nodename, (const char *)si, (const char *)rsi);
1060 } 1143 }
… …
1071 case vpn_packet::PT_CONNECT_REQ: 1154 case vpn_packet::PT_CONNECT_REQ:
1072 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) 1155 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1073 { 1156 {
1074 connect_req_packet *p = (connect_req_packet *) pkt; 1157 connect_req_packet *p = (connect_req_packet *) pkt;
1075 1158
1076 assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything 1159 if (p->id > 0 && p->id <= vpn->conns.size ())
1077 connection *c = vpn->conns[p->id - 1];
1078 conf->protocols = p->protocols;
1079
1080 slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1081 conf->id, p->id, c->ictx && c->octx);
1082
1083 if (c->ictx && c->octx)
1084 { 1160 {
1161 connection *c = vpn->conns[p->id - 1];
1162 conf->protocols = p->protocols;
1163
1164 slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]",
1165 conf->id, p->id, c->ictx && c->octx);
1166
1167 if (c->ictx && c->octx)
1168 {
1085 // send connect_info packets to both sides, in case one is 1169 // send connect_info packets to both sides, in case one is
1086 // behind a nat firewall (or both ;) 1170 // behind a nat firewall (or both ;)
1087 c->send_connect_info (conf->id, si, conf->protocols); 1171 c->send_connect_info (conf->id, si, conf->protocols);
1088 send_connect_info (c->conf->id, c->si, c->conf->protocols); 1172 send_connect_info (c->conf->id, c->si, c->conf->protocols);
1173 }
1174 else
1175 c->establish_connection ();
1089 } 1176 }
1090 else 1177 else
1091 c->establish_connection (); 1178 slog (L_WARN,
1179 _("received authenticated connection request from unknown node #%d, config file mismatch?"),
1180 p->id);
1092 } 1181 }
1093 1182
1094 break; 1183 break;
1095 1184
1096 case vpn_packet::PT_CONNECT_INFO: 1185 case vpn_packet::PT_CONNECT_INFO:
1097 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) 1186 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1098 { 1187 {
1099 connect_info_packet *p = (connect_info_packet *) pkt; 1188 connect_info_packet *p = (connect_info_packet *)pkt;
1100 1189
1101 assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything 1190 if (p->id > 0 && p->id <= vpn->conns.size ())
1102 1191 {
1103 connection *c = vpn->conns[p->id - 1]; 1192 connection *c = vpn->conns[p->id - 1];
1104 1193
1105 c->conf->protocols = p->protocols; 1194 c->conf->protocols = p->protocols;
1106 protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); 1195 protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1107 p->si.upgrade_protocol (protocol, c->conf); 1196 p->si.upgrade_protocol (protocol, c->conf);
1108 1197
1109 slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", 1198 slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",
1110 conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); 1199 conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);
1111 1200
1112 const sockinfo &dsi = forward_si (p->si); 1201 const sockinfo &dsi = forward_si (p->si);
1113 1202
1114 if (dsi.valid ()) 1203 if (dsi.valid ())
1115 c->send_auth_request (dsi, true); 1204 c->send_auth_request (dsi, true);
1205 }
1206 else
1207 slog (L_WARN,
1208 _("received authenticated connection request from unknown node #%d, config file mismatch?"),
1209 p->id);
1116 } 1210 }
1117 1211
1118 break; 1212 break;
1119 1213
1120 default: 1214 default:
1121 send_reset (rsi); 1215 send_reset (rsi);
1122 break; 1216 break;
1123 } 1217 }
1124} 1218}
1125 1219
1126void connection::keepalive_cb (time_watcher &w) 1220inline void
1221connection::keepalive_cb (ev::timer &w, int revents)
1127{ 1222{
1128 if (NOW >= last_activity + ::conf.keepalive + 30) 1223 if (ev_now () >= last_activity + ::conf.keepalive + 30)
1129 { 1224 {
1130 reset_connection (); 1225 reset_connection ();
1131 establish_connection (); 1226 establish_connection ();
1132 } 1227 }
1133 else if (NOW < last_activity + ::conf.keepalive) 1228 else if (ev_now () < last_activity + ::conf.keepalive)
1134 w.start (last_activity + ::conf.keepalive); 1229 w.start (last_activity + ::conf.keepalive - ev::now ());
1135 else if (conf->connectmode != conf_node::C_ONDEMAND 1230 else if (conf->connectmode != conf_node::C_ONDEMAND
1136 || THISNODE->connectmode != conf_node::C_ONDEMAND) 1231 || THISNODE->connectmode != conf_node::C_ONDEMAND)
1137 { 1232 {
1138 send_ping (si); 1233 send_ping (si);
1139 w.start (NOW + 5); 1234 w.start (5);
1140 } 1235 }
1141 else if (NOW < last_activity + ::conf.keepalive + 10) 1236 else if (ev_now () < last_activity + ::conf.keepalive + 10)
1142 // hold ondemand connections implicitly a few seconds longer 1237 // hold ondemand connections implicitly a few seconds longer
1143 // should delete octx, though, or something like that ;) 1238 // should delete octx, though, or something like that ;)
1144 w.start (last_activity + ::conf.keepalive + 10); 1239 w.start (last_activity + ::conf.keepalive + 10 - ev::now ());
1145 else 1240 else
1146 reset_connection (); 1241 reset_connection ();
1147} 1242}
1148 1243
1149void connection::send_connect_request (int id) 1244void connection::send_connect_request (int id)
… …
1155 send_vpn_packet (p, si); 1250 send_vpn_packet (p, si);
1156 1251
1157 delete p; 1252 delete p;
1158} 1253}
1159 1254
1255void connection::script_init_env (const char *ext)
1256{
1257 char *env;
1258 asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1259 asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1260 asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1261 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1262 conf->id & 0xff); putenv (env);
1263}
1264
1160void connection::script_node () 1265void connection::script_init_connect_env ()
1161{ 1266{
1162 vpn->script_if_up (); 1267 vpn->script_init_env ();
1163 1268
1164 char *env; 1269 char *env;
1165 asprintf (&env, "DESTID=%d", conf->id); putenv (env); 1270 asprintf (&env, "DESTID=%d", conf->id); putenv (env);
1166 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); 1271 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1167 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); 1272 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1168 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); 1273 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1169} 1274}
1170 1275
1276inline const char *
1171const char *connection::script_node_up () 1277connection::script_node_up ()
1172{ 1278{
1173 script_node (); 1279 script_init_connect_env ();
1174 1280
1175 putenv ("STATE=up"); 1281 putenv ((char *)"STATE=up");
1176 1282
1283 char *filename;
1284 asprintf (&filename,
1285 "%s/%s",
1286 confbase,
1177 return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; 1287 ::conf.script_node_up ? ::conf.script_node_up : "node-up");
1178}
1179 1288
1289 return filename;
1290}
1291
1292inline const char *
1180const char *connection::script_node_down () 1293connection::script_node_down ()
1181{ 1294{
1182 script_node (); 1295 script_init_connect_env ();
1183 1296
1184 putenv ("STATE=down"); 1297 putenv ((char *)"STATE=down");
1185 1298
1186 return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; 1299 char *filename;
1187} 1300 asprintf (&filename,
1301 "%s/%s",
1302 confbase,
1303 ::conf.script_node_down ? ::conf.script_node_down : "node-down");
1188 1304
1305 return filename;
1306}
1307
1189connection::connection(struct vpn *vpn_) 1308connection::connection (struct vpn *vpn, conf_node *conf)
1190: vpn(vpn_) 1309: vpn(vpn), conf(conf),
1191, rekey (this, &connection::rekey_cb) 1310#if ENABLE_DNS
1192, keepalive (this, &connection::keepalive_cb) 1311 dns (0),
1312#endif
1313 data_queue(conf->max_ttl, conf->max_queue),
1314 vpn_queue(conf->max_ttl, conf->max_queue)
1315{
1316 rekey .set<connection, &connection::rekey_cb > (this);
1317 keepalive .set<connection, &connection::keepalive_cb > (this);
1193, establish_connection (this, &connection::establish_connection_cb) 1318 establish_connection.set<connection, &connection::establish_connection_cb> (this);
1194{ 1319
1195 octx = ictx = 0; 1320 octx = ictx = 0;
1196 retry_cnt = 0; 1321 retry_cnt = 0;
1197 1322
1198 connectmode = conf_node::C_ALWAYS; // initial setting 1323 if (!conf->protocols) // make sure some protocol is enabled
1324 conf->protocols = PROT_UDPv4;
1325
1326 connectmode = conf->connectmode;
1327
1328 // queue a dummy packet to force an initial connection attempt
1329 if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
1330 {
1331 net_packet *p = new net_packet;
1332 p->len = 0;
1333 vpn_queue.put (p);
1334 }
1335
1199 reset_connection (); 1336 reset_connection ();
1200} 1337}
1201 1338
1202connection::~connection () 1339connection::~connection ()
1203{ 1340{

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