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Comparing gvpe/src/connection.C (file contents):
Revision 1.63 by pcg, Sun Dec 2 00:45:41 2007 UTC vs.
Revision 1.80 by pcg, Fri Aug 15 18:11:14 2008 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. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 <list> 34#include <list>
35#include <queue>
36#include <utility>
25 37
26#include <openssl/rand.h> 38#include <openssl/rand.h>
27#include <openssl/evp.h> 39#include <openssl/evp.h>
28#include <openssl/rsa.h> 40#include <openssl/rsa.h>
29#include <openssl/err.h> 41#include <openssl/err.h>
… …
45#define ULTRA_FAST 1 57#define ULTRA_FAST 1
46#define HLOG 15 58#define HLOG 15
47#include "lzf/lzf.h" 59#include "lzf/lzf.h"
48#include "lzf/lzf_c.c" 60#include "lzf/lzf_c.c"
49#include "lzf/lzf_d.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//////////////////////////////////////////////////////////////////////////////
50 103
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;
… …
91 rsachallenge chg; 144 rsachallenge chg;
92}; 145};
93 146
94struct rsa_cache : list<rsa_entry> 147struct rsa_cache : list<rsa_entry>
95{ 148{
96 void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner; 149 inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;
97 150
98 bool find (const rsaid &id, rsachallenge &chg) 151 bool find (const rsaid &id, rsachallenge &chg)
99 { 152 {
100 for (iterator i = begin (); i != end (); ++i) 153 for (iterator i = begin (); i != end (); ++i)
101 { 154 {
… …
130 if (!cleaner.is_active ()) 183 if (!cleaner.is_active ())
131 cleaner.again (); 184 cleaner.again ();
132 } 185 }
133 186
134 rsa_cache () 187 rsa_cache ()
135 : cleaner (this, &rsa_cache::cleaner_cb)
136 { 188 {
189 cleaner.set<rsa_cache, &rsa_cache::cleaner_cb> (this);
137 cleaner.set (RSA_TTL, RSA_TTL); 190 cleaner.set (RSA_TTL, RSA_TTL);
138 } 191 }
139 192
140} rsa_cache; 193} rsa_cache;
141 194
… …
153 } 206 }
154} 207}
155 208
156////////////////////////////////////////////////////////////////////////////// 209//////////////////////////////////////////////////////////////////////////////
157 210
158void 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)
159{ 213{
160 if (queue[i]) 214 queue = new pkt [max_queue];
161 {
162 delete queue[i];
163 j = (j + 1) % QUEUEDEPTH;
164 }
165 215
166 queue[i] = p;
167
168 i = (i + 1) % QUEUEDEPTH;
169}
170
171net_packet *pkt_queue::get ()
172{
173 net_packet *p = queue[j];
174
175 if (p)
176 {
177 queue[j] = 0;
178 j = (j + 1) % QUEUEDEPTH;
179 }
180
181 return p;
182}
183
184pkt_queue::pkt_queue ()
185{
186 memset (queue, 0, sizeof (queue));
187 i = 0; 216 i = 0;
188 j = 0; 217 j = 0;
218
219 expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
189} 220}
190 221
191pkt_queue::~pkt_queue () 222pkt_queue::~pkt_queue ()
192{ 223{
193 for (i = QUEUEDEPTH; --i > 0; ) 224 while (net_packet *p = get ())
225 delete p;
226
194 delete queue[i]; 227 delete [] queue;
228}
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;
195} 281}
196 282
197struct net_rateinfo 283struct net_rateinfo
198{ 284{
199 u32 host; 285 u32 host;
… …
586///////////////////////////////////////////////////////////////////////////// 672/////////////////////////////////////////////////////////////////////////////
587 673
588void 674void
589connection::connection_established () 675connection::connection_established ()
590{ 676{
591 slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx); 677 slog (L_NOISE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx);
592 678
593 if (ictx && octx) 679 if (ictx && octx)
594 { 680 {
595 connectmode = conf->connectmode;
596
597 // make sure rekeying timeouts are slightly asymmetric 681 // make sure rekeying timeouts are slightly asymmetric
598 ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); 682 ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
599 rekey.start (rekey_interval, rekey_interval); 683 rekey.start (rekey_interval, rekey_interval);
600 keepalive.start (::conf.keepalive); 684 keepalive.start (::conf.keepalive);
601 685
602 // send queued packets 686 // send queued packets
603 if (ictx && octx) 687 if (ictx && octx)
604 { 688 {
605 while (tap_packet *p = (tap_packet *)data_queue.get ()) 689 while (tap_packet *p = (tap_packet *)data_queue.get ())
606 { 690 {
607 send_data_packet (p); 691 if (p->len) send_data_packet (p);
608 delete p; 692 delete p;
609 } 693 }
610 694
611 while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) 695 while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
612 { 696 {
613 send_vpn_packet (p, si, IPTOS_RELIABILITY); 697 if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
614 delete p; 698 delete p;
615 } 699 }
616 } 700 }
701
702 vpn->connection_established (this);
617 } 703 }
618 else 704 else
619 { 705 {
620 retry_cnt = 0; 706 retry_cnt = 0;
621 establish_connection.start (5); 707 establish_connection.start (5);
… …
625} 711}
626 712
627void 713void
628connection::reset_si () 714connection::reset_si ()
629{ 715{
716 if (vpn->can_direct (THISNODE, conf))
630 protocol = best_protocol (THISNODE->protocols & conf->protocols); 717 protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
631 718 else
632 // mask out protocols we cannot establish
633 if (!conf->udp_port) protocol &= ~PROT_UDPv4;
634 if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
635 if (!conf->dns_port) protocol &= ~PROT_DNSv4;
636
637 if (protocol
638 && (!conf->can_direct (THISNODE)
639 || !THISNODE->can_direct (conf)))
640 { 719 {
641 slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename); 720 slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
642 protocol = 0; 721 protocol = 0;
643 } 722 }
644 723
645 si.set (conf, protocol); 724 si.set (conf, protocol);
725
726 is_direct = si.valid ();
646} 727}
647 728
648// ensure sockinfo is valid, forward if necessary 729// ensure sockinfo is valid, forward if necessary
649const sockinfo & 730const sockinfo &
650connection::forward_si (const sockinfo &si) const 731connection::forward_si (const sockinfo &si) const
651{ 732{
652 if (!si.valid ()) 733 if (!si.valid ())
653 { 734 {
654 connection *r = vpn->find_router (); 735 connection *r = vpn->find_router_for (this);
655 736
656 if (r) 737 if (r)
657 { 738 {
658 slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"), 739 slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
659 conf->nodename, r->conf->nodename, (const char *)r->si); 740 conf->nodename, r->conf->nodename);
660 return r->si; 741 return r->si;
661 } 742 }
662 else 743 else
663 slog (L_DEBUG, _("%s: node unreachable, no common protocol"), 744 slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
664 conf->nodename); 745 conf->nodename);
665 } 746 }
666 747
667 return si; 748 return si;
668} 749}
… …
678connection::send_ping (const sockinfo &si, u8 pong) 759connection::send_ping (const sockinfo &si, u8 pong)
679{ 760{
680 ping_packet *pkt = new ping_packet; 761 ping_packet *pkt = new ping_packet;
681 762
682 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
683 send_vpn_packet (pkt, si, IPTOS_LOWDELAY); 767 send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
684 768
685 delete pkt; 769 delete pkt;
686} 770}
687 771
… …
706 790
707 rsachallenge chg; 791 rsachallenge chg;
708 rsa_cache.gen (pkt->id, chg); 792 rsa_cache.gen (pkt->id, chg);
709 rsa_encrypt (conf->rsa_key, chg, pkt->encr); 793 rsa_encrypt (conf->rsa_key, chg, pkt->encr);
710 794
711 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);
712 796
713 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
714 798
715 delete pkt; 799 delete pkt;
716} 800}
… …
724 808
725 rsa_hash (id, chg, pkt->response); 809 rsa_hash (id, chg, pkt->response);
726 810
727 pkt->hmac_set (octx); 811 pkt->hmac_set (octx);
728 812
729 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);
730 814
731 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
732 816
733 delete pkt; 817 delete pkt;
734} 818}
735 819
736void 820void
737connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) 821connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
738{ 822{
739 slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)", 823 slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s)", conf->nodename,
740 conf->id, rid, (const char *)rsi); 824 vpn->conns[rid - 1]->conf->nodename, (const char *)rsi);
741 825
742 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);
743 827
744 r->hmac_set (octx); 828 r->hmac_set (octx);
745 send_vpn_packet (r, si); 829 send_vpn_packet (r, si);
746 830
747 delete r; 831 delete r;
748} 832}
749 833
750void 834inline void
751connection::establish_connection_cb (ev::timer &w, int revents) 835connection::establish_connection_cb (ev::timer &w, int revents)
752{ 836{
753 if (!ictx 837 if (!ictx
754 && conf != THISNODE 838 && conf != THISNODE
755 && connectmode != conf_node::C_NEVER 839 && connectmode != conf_node::C_NEVER
756 && connectmode != conf_node::C_DISABLED 840 && connectmode != conf_node::C_DISABLED
757 && !w.is_active ()) 841 && !w.is_active ())
758 { 842 {
843 // a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
844 // and stop trying. should probably be handled by a per-connection expire handler.
845 if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
846 {
847 reset_connection ();
848 return;
849 }
850
851 last_establish_attempt = ev_now ();
852
759 ev::tstamp retry_int = ev::tstamp (retry_cnt & 3 853 ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
760 ? (retry_cnt & 3) + 1 854 ? (retry_cnt & 3) + 1
761 : 1 << (retry_cnt >> 2)); 855 : 1 << (retry_cnt >> 2));
762 856
763 reset_si (); 857 reset_si ();
764 858
765 bool slow = si.prot & PROT_SLOW; 859 bool slow = si.prot & PROT_SLOW;
766 860
767 if (si.prot && !si.host) 861 if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
768 { 862 {
769 slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename);
770 /*TODO*/ /* start the timer so we don't recurse endlessly */ 863 /*TODO*/ /* start the timer so we don't recurse endlessly */
771 w.start (1); 864 w.start (1);
772 vpn->send_connect_request (conf->id); 865 vpn->send_connect_request (this);
773 } 866 }
774 else 867 else
775 { 868 {
776 slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx); 869 if (si.valid ())
870 slog (L_DEBUG, _("%s: sending direct connection request to %s."),
871 conf->nodename, (const char *)si);
777 872
778 const sockinfo &dsi = forward_si (si); 873 const sockinfo &dsi = forward_si (si);
779 874
780 slow = slow || (dsi.prot & PROT_SLOW); 875 slow = slow || (dsi.prot & PROT_SLOW);
781 876
… …
786 else 881 else
787 send_ping (dsi, 0); 882 send_ping (dsi, 0);
788 } 883 }
789 } 884 }
790 885
791 retry_int *= slow ? 8. : 0.7; 886 retry_int *= slow ? 8. : 0.9;
792 887
793 if (retry_int < conf->max_retry) 888 if (retry_int < conf->max_retry)
794 retry_cnt++; 889 retry_cnt++;
795 else 890 else
796 retry_int = conf->max_retry; 891 retry_int = conf->max_retry;
… …
806 { 901 {
807 slog (L_INFO, _("%s(%s): connection lost"), 902 slog (L_INFO, _("%s(%s): connection lost"),
808 conf->nodename, (const char *)si); 903 conf->nodename, (const char *)si);
809 904
810 if (::conf.script_node_down) 905 if (::conf.script_node_down)
811 if (!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);
812 slog (L_WARN, _("node-down command execution failed, continuing.")); 909 run_script_queued (cb, _("node-down command execution failed, continuing."));
910 }
813 } 911 }
814 912
815 delete ictx; ictx = 0; 913 delete ictx; ictx = 0;
816 delete octx; octx = 0; 914 delete octx; octx = 0;
817#if ENABLE_DNS 915#if ENABLE_DNS
818 dnsv4_reset_connection (); 916 dnsv4_reset_connection ();
819#endif 917#endif
820 918
821 si.host = 0; 919 si.host = 0;
822 920
823 last_activity = 0; 921 last_activity = 0.;
922 //last_si_change = 0.;
824 retry_cnt = 0; 923 retry_cnt = 0;
825 924
826 rekey.stop (); 925 rekey.stop ();
827 keepalive.stop (); 926 keepalive.stop ();
828 establish_connection.stop (); 927 establish_connection.stop ();
… …
835 send_reset (si); 934 send_reset (si);
836 935
837 reset_connection (); 936 reset_connection ();
838} 937}
839 938
840void 939// poor-man's rekeying
940inline void
841connection::rekey_cb (ev::timer &w, int revents) 941connection::rekey_cb (ev::timer &w, int revents)
842{ 942{
843 reset_connection (); 943 reset_connection ();
844 establish_connection (); 944 establish_connection ();
845} 945}
… …
862 if (oseqno > MAX_SEQNO) 962 if (oseqno > MAX_SEQNO)
863 rekey (); 963 rekey ();
864} 964}
865 965
866void 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
867connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) 977connection::inject_data_packet (tap_packet *pkt)
868{ 978{
869 if (ictx && octx) 979 if (ictx && octx)
870 send_data_packet (pkt); 980 send_data_packet (pkt);
871 else 981 else
872 { 982 {
873 if (!broadcast)
874 data_queue.put (new tap_packet (*pkt)); 983 data_queue.put (new tap_packet (*pkt));
875 984 post_inject_queue ();
876 establish_connection ();
877 } 985 }
878} 986}
879 987
880void connection::inject_vpn_packet (vpn_packet *pkt, int tos) 988void connection::inject_vpn_packet (vpn_packet *pkt, int tos)
881{ 989{
882 if (ictx && octx) 990 if (ictx && octx)
883 send_vpn_packet (pkt, si, tos); 991 send_vpn_packet (pkt, si, tos);
884 else 992 else
885 { 993 {
886 vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); 994 vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
887 995 post_inject_queue ();
888 establish_connection ();
889 } 996 }
890} 997}
891 998
892void 999void
893connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) 1000connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
894{ 1001{
895 last_activity = ev_now (); 1002 last_activity = ev_now ();
896 1003
897 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.",
898 conf->id, pkt->typ (), pkt->src (), pkt->dst ()); 1005 conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
899 1006
900 if (connectmode == conf_node::C_DISABLED) 1007 if (connectmode == conf_node::C_DISABLED)
901 return; 1008 return;
902 1009
903 switch (pkt->typ ()) 1010 switch (pkt->typ ())
904 { 1011 {
905 case vpn_packet::PT_PING: 1012 case vpn_packet::PT_PING:
1013 slog (L_TRACE, "%s >> PT_PING", conf->nodename);
1014
906 // we send pings instead of auth packets after some retries, 1015 // we send pings instead of auth packets after some retries,
907 // so reset the retry counter and establish a connection 1016 // so reset the retry counter and establish a connection
908 // when we receive a ping. 1017 // when we receive a ping.
909 if (!ictx) 1018 if (!ictx)
910 { 1019 {
911 if (auth_rate_limiter.can (rsi)) 1020 if (auth_rate_limiter.can (rsi))
912 send_auth_request (rsi, true); 1021 send_auth_request (rsi, true);
913 } 1022 }
914 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.
915 send_ping (rsi, 1); // pong 1026 send_ping (rsi, 1); // pong
916 1027
917 break; 1028 break;
918 1029
919 case vpn_packet::PT_PONG: 1030 case vpn_packet::PT_PONG:
1031 slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
920 break; 1032 break;
921 1033
922 case vpn_packet::PT_RESET: 1034 case vpn_packet::PT_RESET:
923 { 1035 {
924 reset_connection (); 1036 reset_connection ();
925 1037
926 config_packet *p = (config_packet *) pkt; 1038 config_packet *p = (config_packet *) pkt;
927 1039
928 if (!p->chk_config ()) 1040 if (!p->chk_config ())
929 { 1041 {
930 slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"), 1042 slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
931 conf->nodename, (const char *)rsi); 1043 conf->nodename, (const char *)rsi);
932 connectmode = conf_node::C_DISABLED; 1044 connectmode = conf_node::C_DISABLED;
933 } 1045 }
934 else if (connectmode == conf_node::C_ALWAYS) 1046 else if (connectmode == conf_node::C_ALWAYS)
935 establish_connection (); 1047 establish_connection ();
… …
939 case vpn_packet::PT_AUTH_REQ: 1051 case vpn_packet::PT_AUTH_REQ:
940 if (auth_rate_limiter.can (rsi)) 1052 if (auth_rate_limiter.can (rsi))
941 { 1053 {
942 auth_req_packet *p = (auth_req_packet *) pkt; 1054 auth_req_packet *p = (auth_req_packet *) pkt;
943 1055
944 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");
945 1057
946 if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) 1058 if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))
947 { 1059 {
948 if (p->prot_minor != PROTOCOL_MINOR) 1060 if (p->prot_minor != PROTOCOL_MINOR)
949 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."),
… …
977 1089
978 break; 1090 break;
979 } 1091 }
980 } 1092 }
981 else 1093 else
982 slog (L_WARN, _("%s(%s): protocol mismatch"), 1094 slog (L_WARN, _("%s(%s): protocol mismatch."),
983 conf->nodename, (const char *)rsi); 1095 conf->nodename, (const char *)rsi);
984 1096
985 send_reset (rsi); 1097 send_reset (rsi);
986 } 1098 }
987 1099
988 break; 1100 break;
989 1101
990 case vpn_packet::PT_AUTH_RES: 1102 case vpn_packet::PT_AUTH_RES:
991 { 1103 {
992 auth_res_packet *p = (auth_res_packet *) pkt; 1104 auth_res_packet *p = (auth_res_packet *)pkt;
993 1105
994 slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); 1106 slog (L_TRACE, "%s << PT_AUTH_RES", conf->nodename);
995 1107
996 if (p->chk_config ()) 1108 if (p->chk_config ())
997 { 1109 {
998 if (p->prot_minor != PROTOCOL_MINOR) 1110 if (p->prot_minor != PROTOCOL_MINOR)
999 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."),
… …
1002 1114
1003 rsachallenge chg; 1115 rsachallenge chg;
1004 1116
1005 if (!rsa_cache.find (p->id, chg)) 1117 if (!rsa_cache.find (p->id, chg))
1006 { 1118 {
1007 slog (L_ERR, _("%s(%s): unrequested auth response ignored"), 1119 slog (L_ERR, _("%s(%s): unrequested auth response, ignoring."),
1008 conf->nodename, (const char *)rsi); 1120 conf->nodename, (const char *)rsi);
1009 break; 1121 break;
1010 } 1122 }
1011 else 1123 else
1012 { 1124 {
1013 crypto_ctx *cctx = new crypto_ctx (chg, 0); 1125 crypto_ctx *cctx = new crypto_ctx (chg, 0);
1014 1126
1015 if (!p->hmac_chk (cctx)) 1127 if (!p->hmac_chk (cctx))
1016 { 1128 {
1017 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"
1018 "could be an attack, or just corruption or a synchronization error"), 1130 "could be an attack, or just corruption or a synchronization error."),
1019 conf->nodename, (const char *)rsi); 1131 conf->nodename, (const char *)rsi);
1020 break; 1132 break;
1021 } 1133 }
1022 else 1134 else
1023 { 1135 {
… …
1034 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
1035 1147
1036 si = rsi; 1148 si = rsi;
1037 protocol = rsi.prot; 1149 protocol = rsi.prot;
1038 1150
1151 slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
1152 conf->nodename, (const char *)rsi,
1153 is_direct ? "direct" : "routed",
1154 p->prot_major, p->prot_minor);
1155
1039 connection_established (); 1156 connection_established ();
1040 1157
1041 slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1042 conf->nodename, (const char *)rsi,
1043 p->prot_major, p->prot_minor);
1044
1045 if (::conf.script_node_up) 1158 if (::conf.script_node_up)
1046 if (!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);
1047 slog (L_WARN, _("node-up command execution failed, continuing.")); 1162 run_script_queued (cb, _("node-up command execution failed, continuing."));
1163 }
1048 1164
1049 break; 1165 break;
1050 } 1166 }
1051 else 1167 else
1052 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."),
1053 conf->nodename, (const char *)rsi); 1169 conf->nodename, (const char *)rsi);
1054 } 1170 }
1055 1171
1056 delete cctx; 1172 delete cctx;
1057 } 1173 }
… …
1073 { 1189 {
1074 vpndata_packet *p = (vpndata_packet *)pkt; 1190 vpndata_packet *p = (vpndata_packet *)pkt;
1075 1191
1076 if (!p->hmac_chk (ictx)) 1192 if (!p->hmac_chk (ictx))
1077 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"
1078 "could be an attack, or just corruption or a synchronization error"), 1194 "could be an attack, or just corruption or a synchronization error."),
1079 conf->nodename, (const char *)rsi); 1195 conf->nodename, (const char *)rsi);
1080 else 1196 else
1081 { 1197 {
1082 u32 seqno; 1198 u32 seqno;
1083 tap_packet *d = p->unpack (this, seqno); 1199 tap_packet *d = p->unpack (this, seqno);
1200 int seqclass = iseqno.seqno_classify (seqno);
1084 1201
1085 if (iseqno.recv_ok (seqno)) 1202 if (seqclass == 0) // ok
1086 { 1203 {
1087 vpn->tap->send (d); 1204 vpn->tap->send (d);
1088 1205
1089 if (si != rsi) 1206 if (si != rsi)
1090 { 1207 {
1091 // fast re-sync on source address 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.)
1092 si = rsi; 1210 // {
1093
1094 slog (L_INFO, _("%s(%s): socket address changed to %s"), 1211 slog (L_INFO, _("%s(%s): changing socket address to %s."),
1095 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);
1096 } 1219 }
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);
1097 } 1232 }
1098 1233
1099 delete d; 1234 delete d;
1100 break; 1235 break;
1101 } 1236 }
… …
1112 if (p->id > 0 && p->id <= vpn->conns.size ()) 1247 if (p->id > 0 && p->id <= vpn->conns.size ())
1113 { 1248 {
1114 connection *c = vpn->conns[p->id - 1]; 1249 connection *c = vpn->conns[p->id - 1];
1115 conf->protocols = p->protocols; 1250 conf->protocols = p->protocols;
1116 1251
1117 slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]", 1252 slog (L_TRACE, "%s << PT_CONNECT_REQ(%s) [%d]",
1118 conf->id, p->id, c->ictx && c->octx); 1253 conf->nodename, vpn->conns[p->id - 1]->conf->nodename, c->ictx && c->octx);
1119 1254
1120 if (c->ictx && c->octx) 1255 if (c->ictx && c->octx)
1121 { 1256 {
1122 // send connect_info packets to both sides, in case one is 1257 // send connect_info packets to both sides, in case one is
1123 // behind a nat firewall (or both ;) 1258 // behind a nat firewall (or both ;)
… …
1146 1281
1147 c->conf->protocols = p->protocols; 1282 c->conf->protocols = p->protocols;
1148 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));
1149 p->si.upgrade_protocol (protocol, c->conf); 1284 p->si.upgrade_protocol (protocol, c->conf);
1150 1285
1151 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,
1152 conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); 1288 (const char *)p->si, !c->ictx && !c->octx);
1153 1289
1154 const sockinfo &dsi = forward_si (p->si); 1290 const sockinfo &dsi = forward_si (p->si);
1155 1291
1156 if (dsi.valid ()) 1292 if (dsi.valid ())
1157 c->send_auth_request (dsi, true); 1293 c->send_auth_request (dsi, true);
… …
1168 send_reset (rsi); 1304 send_reset (rsi);
1169 break; 1305 break;
1170 } 1306 }
1171} 1307}
1172 1308
1309inline void
1173void connection::keepalive_cb (ev::timer &w, int revents) 1310connection::keepalive_cb (ev::timer &w, int revents)
1174{ 1311{
1175 if (ev_now () >= last_activity + ::conf.keepalive + 30) 1312 if (ev_now () >= last_activity + ::conf.keepalive + 30)
1176 { 1313 {
1177 reset_connection (); 1314 reset_connection ();
1178 establish_connection (); 1315 establish_connection ();
… …
1195 1332
1196void connection::send_connect_request (int id) 1333void connection::send_connect_request (int id)
1197{ 1334{
1198 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);
1199 1336
1200 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);
1201 p->hmac_set (octx); 1339 p->hmac_set (octx);
1202 send_vpn_packet (p, si); 1340 send_vpn_packet (p, si);
1203 1341
1204 delete p; 1342 delete p;
1205} 1343}
… …
1223 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); 1361 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1224 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); 1362 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1225 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); 1363 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1226} 1364}
1227 1365
1366inline const char *
1228const char *connection::script_node_up () 1367connection::script_node_up ()
1229{ 1368{
1230 script_init_connect_env (); 1369 script_init_connect_env ();
1231 1370
1232 putenv ((char *)"STATE=up"); 1371 putenv ((char *)"STATE=up");
1233 1372
… …
1238 ::conf.script_node_up ? ::conf.script_node_up : "node-up"); 1377 ::conf.script_node_up ? ::conf.script_node_up : "node-up");
1239 1378
1240 return filename; 1379 return filename;
1241} 1380}
1242 1381
1382inline const char *
1243const char *connection::script_node_down () 1383connection::script_node_down ()
1244{ 1384{
1245 script_init_connect_env (); 1385 script_init_connect_env ();
1246 1386
1247 putenv ((char *)"STATE=down"); 1387 putenv ((char *)"STATE=down");
1248 1388
… …
1254 1394
1255 return filename; 1395 return filename;
1256} 1396}
1257 1397
1258connection::connection (struct vpn *vpn, conf_node *conf) 1398connection::connection (struct vpn *vpn, conf_node *conf)
1259: vpn(vpn), conf(conf) 1399: vpn(vpn), conf(conf),
1260, rekey (this, &connection::rekey_cb)
1261, keepalive (this, &connection::keepalive_cb)
1262, establish_connection (this, &connection::establish_connection_cb)
1263#if ENABLE_DNS 1400#if ENABLE_DNS
1264, dns (0) 1401 dns (0),
1265#endif 1402#endif
1403 data_queue(conf->max_ttl, conf->max_queue + 1),
1404 vpn_queue(conf->max_ttl, conf->max_queue + 1)
1266{ 1405{
1406 rekey .set<connection, &connection::rekey_cb > (this);
1407 keepalive .set<connection, &connection::keepalive_cb > (this);
1408 establish_connection.set<connection, &connection::establish_connection_cb> (this);
1409
1410 last_establish_attempt = 0.;
1267 octx = ictx = 0; 1411 octx = ictx = 0;
1268 retry_cnt = 0;
1269 1412
1270 if (!conf->protocols) // make sure some protocol is enabled 1413 if (!conf->protocols) // make sure some protocol is enabled
1271 conf->protocols = PROT_UDPv4; 1414 conf->protocols = PROT_UDPv4;
1272 1415
1273 connectmode = conf_node::C_ALWAYS; // initial setting 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
1274 reset_connection (); 1422 reset_connection ();
1275} 1423}
1276 1424
1277connection::~connection () 1425connection::~connection ()
1278{ 1426{

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