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Comparing gvpe/src/connection.C (file contents):
Revision 1.30 by pcg, Thu Jan 29 19:22:05 2004 UTC vs.
Revision 1.61 by pcg, Sat Nov 10 19:43:37 2007 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"
… …
92 rsachallenge chg; 90 rsachallenge chg;
93}; 91};
94 92
95struct rsa_cache : list<rsa_entry> 93struct rsa_cache : list<rsa_entry>
96{ 94{
97 void cleaner_cb (time_watcher &w); time_watcher cleaner; 95 void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;
98 96
99 bool find (const rsaid &id, rsachallenge &chg) 97 bool find (const rsaid &id, rsachallenge &chg)
100 { 98 {
101 for (iterator i = begin (); i != end (); ++i) 99 for (iterator i = begin (); i != end (); ++i)
102 { 100 {
103 if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) 101 if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev::ev_now ())
104 { 102 {
105 memcpy (&chg, &i->chg, sizeof chg); 103 memcpy (&chg, &i->chg, sizeof chg);
106 104
107 erase (i); 105 erase (i);
108 return true; 106 return true;
109 } 107 }
110 } 108 }
111 109
112 if (cleaner.at < NOW) 110 if (!cleaner.is_active ())
113 cleaner.start (NOW + RSA_TTL); 111 cleaner.again ();
114 112
115 return false; 113 return false;
116 } 114 }
117 115
118 void gen (rsaid &id, rsachallenge &chg) 116 void gen (rsaid &id, rsachallenge &chg)
119 { 117 {
120 rsa_entry e; 118 rsa_entry e;
121 119
122 RAND_bytes ((unsigned char *)&id, sizeof id); 120 RAND_bytes ((unsigned char *)&id, sizeof id);
123 RAND_bytes ((unsigned char *)&chg, sizeof chg); 121 RAND_bytes ((unsigned char *)&chg, sizeof chg);
124 122
125 e.expire = NOW + RSA_TTL; 123 e.expire = ev::ev_now () + RSA_TTL;
126 e.id = id; 124 e.id = id;
127 memcpy (&e.chg, &chg, sizeof chg); 125 memcpy (&e.chg, &chg, sizeof chg);
128 126
129 push_back (e); 127 push_back (e);
130 128
131 if (cleaner.at < NOW) 129 if (!cleaner.is_active ())
132 cleaner.start (NOW + RSA_TTL); 130 cleaner.again ();
133 } 131 }
134 132
135 rsa_cache () 133 rsa_cache ()
136 : cleaner (this, &rsa_cache::cleaner_cb) 134 : cleaner (this, &rsa_cache::cleaner_cb)
137 { } 135 {
136 cleaner.set (RSA_TTL, RSA_TTL);
137 }
138 138
139} rsa_cache; 139} rsa_cache;
140 140
141void rsa_cache::cleaner_cb (time_watcher &w) 141void rsa_cache::cleaner_cb (ev::timer &w, int revents)
142{ 142{
143 if (!empty ()) 143 if (empty ())
144 w.stop ();
145 else
144 { 146 {
145 w.start (NOW + RSA_TTL);
146
147 for (iterator i = begin (); i != end (); ) 147 for (iterator i = begin (); i != end (); )
148 if (i->expire <= NOW) 148 if (i->expire <= ev::ev_now ())
149 i = erase (i); 149 i = erase (i);
150 else 150 else
151 ++i; 151 ++i;
152 } 152 }
153} 153}
… …
202// only do action once every x seconds per host whole allowing bursts. 202// only do action once every x seconds per host whole allowing bursts.
203// this implementation ("splay list" ;) is inefficient, 203// this implementation ("splay list" ;) is inefficient,
204// but low on resources. 204// but low on resources.
205struct net_rate_limiter : list<net_rateinfo> 205struct net_rate_limiter : list<net_rateinfo>
206{ 206{
207 static const double ALPHA = 1. - 1. / 600.; // allow bursts 207# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
208 static const double CUTOFF = 10.; // one event every CUTOFF seconds 208# define NRL_CUTOFF 10. // one event every CUTOFF seconds
209 static const double EXPIRE = CUTOFF * 30.; // expire entries after this time 209# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
210 static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value 210# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
211 211
212 bool can (const sockinfo &si) { return can((u32)si.host); } 212 bool can (const sockinfo &si) { return can((u32)si.host); }
213 bool can (u32 host); 213 bool can (u32 host);
214}; 214};
215 215
… …
220 iterator i; 220 iterator i;
221 221
222 for (i = begin (); i != end (); ) 222 for (i = begin (); i != end (); )
223 if (i->host == host) 223 if (i->host == host)
224 break; 224 break;
225 else if (i->last < NOW - EXPIRE) 225 else if (i->last < ev::ev_now () - NRL_EXPIRE)
226 i = erase (i); 226 i = erase (i);
227 else 227 else
228 i++; 228 i++;
229 229
230 if (i == end ()) 230 if (i == end ())
231 { 231 {
232 net_rateinfo ri; 232 net_rateinfo ri;
233 233
234 ri.host = host; 234 ri.host = host;
235 ri.pcnt = 1.; 235 ri.pcnt = 1.;
236 ri.diff = MAXDIF; 236 ri.diff = NRL_MAXDIF;
237 ri.last = NOW; 237 ri.last = ev::ev_now ();
238 238
239 push_front (ri); 239 push_front (ri);
240 240
241 return true; 241 return true;
242 } 242 }
243 else 243 else
244 { 244 {
245 net_rateinfo ri (*i); 245 net_rateinfo ri (*i);
246 erase (i); 246 erase (i);
247 247
248 ri.pcnt = ri.pcnt * ALPHA; 248 ri.pcnt = ri.pcnt * NRL_ALPHA;
249 ri.diff = ri.diff * ALPHA + (NOW - ri.last); 249 ri.diff = ri.diff * NRL_ALPHA + (ev::ev_now () - ri.last);
250 250
251 ri.last = NOW; 251 ri.last = ev::ev_now ();
252 252
253 double dif = ri.diff / ri.pcnt; 253 double dif = ri.diff / ri.pcnt;
254 254
255 bool send = dif > CUTOFF; 255 bool send = dif > NRL_CUTOFF;
256 256
257 if (dif > MAXDIF) 257 if (dif > NRL_MAXDIF)
258 { 258 {
259 ri.pcnt = 1.; 259 ri.pcnt = 1.;
260 ri.diff = MAXDIF; 260 ri.diff = NRL_MAXDIF;
261 } 261 }
262 else if (send) 262 else if (send)
263 ri.pcnt++; 263 ri.pcnt++;
264 264
265 push_front (ri); 265 push_front (ri);
… …
335 int outl = 0, outl2; 335 int outl = 0, outl2;
336 ptype type = PT_DATA_UNCOMPRESSED; 336 ptype type = PT_DATA_UNCOMPRESSED;
337 337
338#if ENABLE_COMPRESSION 338#if ENABLE_COMPRESSION
339 u8 cdata[MAX_MTU]; 339 u8 cdata[MAX_MTU];
340 u32 cl;
341 340
341 if (conn->features & ENABLE_COMPRESSION)
342 {
342 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); 343 u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
344
343 if (cl) 345 if (cl)
344 { 346 {
345 type = PT_DATA_COMPRESSED; 347 type = PT_DATA_COMPRESSED;
346 d = cdata; 348 d = cdata;
347 l = cl + 2; 349 l = cl + 2;
348 350
349 d[0] = cl >> 8; 351 d[0] = cl >> 8;
350 d[1] = cl; 352 d[1] = cl;
353 }
351 } 354 }
352#endif 355#endif
353 356
354 require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); 357 require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));
355 358
… …
448{ 451{
449 // actually, hmaclen cannot be checked because the hmac 452 // actually, hmaclen cannot be checked because the hmac
450 // field comes before this data, so peers with other 453 // field comes before this data, so peers with other
451 // hmacs simply will not work. 454 // hmacs simply will not work.
452 u8 prot_major, prot_minor, randsize, hmaclen; 455 u8 prot_major, prot_minor, randsize, hmaclen;
453 u8 flags, challengelen, pad2, pad3; 456 u8 flags, challengelen, features, pad3;
454 u32 cipher_nid, digest_nid, hmac_nid; 457 u32 cipher_nid, digest_nid, hmac_nid;
455
456 const u8 curflags () const
457 {
458 return 0x80
459 | (ENABLE_COMPRESSION ? 0x01 : 0x00);
460 }
461 458
462 void setup (ptype type, int dst); 459 void setup (ptype type, int dst);
463 bool chk_config () const; 460 bool chk_config () const;
461
462 static u8 get_features ()
463 {
464 u8 f = 0;
465#if ENABLE_COMPRESSION
466 f |= FEATURE_COMPRESSION;
467#endif
468#if ENABLE_ROHC
469 f |= FEATURE_ROHC;
470#endif
471#if ENABLE_BRIDGING
472 f |= FEATURE_BRIDGING;
473#endif
474 return f;
475 }
464}; 476};
465 477
466void config_packet::setup (ptype type, int dst) 478void config_packet::setup (ptype type, int dst)
467{ 479{
468 prot_major = PROTOCOL_MAJOR; 480 prot_major = PROTOCOL_MAJOR;
469 prot_minor = PROTOCOL_MINOR; 481 prot_minor = PROTOCOL_MINOR;
470 randsize = RAND_SIZE; 482 randsize = RAND_SIZE;
471 hmaclen = HMACLENGTH; 483 hmaclen = HMACLENGTH;
472 flags = curflags (); 484 flags = 0;
473 challengelen = sizeof (rsachallenge); 485 challengelen = sizeof (rsachallenge);
486 features = get_features ();
474 487
475 cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); 488 cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
476 digest_nid = htonl (EVP_MD_type (RSA_HASH)); 489 digest_nid = htonl (EVP_MD_type (RSA_HASH));
477 hmac_nid = htonl (EVP_MD_type (DIGEST)); 490 hmac_nid = htonl (EVP_MD_type (DIGEST));
478 491
… …
486 slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); 499 slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
487 else if (randsize != RAND_SIZE) 500 else if (randsize != RAND_SIZE)
488 slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); 501 slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
489 else if (hmaclen != HMACLENGTH) 502 else if (hmaclen != HMACLENGTH)
490 slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); 503 slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
491 else if (flags != curflags ())
492 slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
493 else if (challengelen != sizeof (rsachallenge)) 504 else if (challengelen != sizeof (rsachallenge))
494 slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); 505 slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
495 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) 506 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
496 slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); 507 slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));
497 else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) 508 else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
… …
573///////////////////////////////////////////////////////////////////////////// 584/////////////////////////////////////////////////////////////////////////////
574 585
575void 586void
576connection::connection_established () 587connection::connection_established ()
577{ 588{
589 slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx);
590
578 if (ictx && octx) 591 if (ictx && octx)
579 { 592 {
580 connectmode = conf->connectmode; 593 connectmode = conf->connectmode;
581 594
582 rekey.start (NOW + ::conf.rekey); 595 // make sure rekeying timeouts are slightly asymmetric
596 ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
597 rekey.start (rekey_interval, rekey_interval);
583 keepalive.start (NOW + ::conf.keepalive); 598 keepalive.start (::conf.keepalive);
584 599
585 // send queued packets 600 // send queued packets
586 if (ictx && octx) 601 if (ictx && octx)
587 { 602 {
588 while (tap_packet *p = (tap_packet *)data_queue.get ()) 603 while (tap_packet *p = (tap_packet *)data_queue.get ())
… …
599 } 614 }
600 } 615 }
601 else 616 else
602 { 617 {
603 retry_cnt = 0; 618 retry_cnt = 0;
604 establish_connection.start (NOW + 5); 619 establish_connection.start (5);
605 keepalive.stop (); 620 keepalive.stop ();
606 rekey.stop (); 621 rekey.stop ();
607 } 622 }
608} 623}
609 624
… …
613 protocol = best_protocol (THISNODE->protocols & conf->protocols); 628 protocol = best_protocol (THISNODE->protocols & conf->protocols);
614 629
615 // mask out protocols we cannot establish 630 // mask out protocols we cannot establish
616 if (!conf->udp_port) protocol &= ~PROT_UDPv4; 631 if (!conf->udp_port) protocol &= ~PROT_UDPv4;
617 if (!conf->tcp_port) protocol &= ~PROT_TCPv4; 632 if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
633 if (!conf->dns_port) protocol &= ~PROT_DNSv4;
634
635 if (protocol
636 && (!conf->can_direct (THISNODE)
637 || !THISNODE->can_direct (conf)))
638 {
639 slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename);
640 protocol = 0;
641 }
618 642
619 si.set (conf, protocol); 643 si.set (conf, protocol);
620} 644}
621 645
622// ensure sockinfo is valid, forward if necessary 646// ensure sockinfo is valid, forward if necessary
… …
627 { 651 {
628 connection *r = vpn->find_router (); 652 connection *r = vpn->find_router ();
629 653
630 if (r) 654 if (r)
631 { 655 {
632 slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"), 656 slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),
633 conf->nodename, r->conf->nodename); 657 conf->nodename, r->conf->nodename, (const char *)r->si);
634 return r->si; 658 return r->si;
635 } 659 }
636 else 660 else
637 slog (L_DEBUG, _("%s: node unreachable, no common protocol"), 661 slog (L_DEBUG, _("%s: node unreachable, no common protocol"),
638 conf->nodename); 662 conf->nodename);
… …
708} 732}
709 733
710void 734void
711connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) 735connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
712{ 736{
713 slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", 737 slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)",
714 conf->id, rid, (const char *)rsi); 738 conf->id, rid, (const char *)rsi);
715 739
716 connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); 740 connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
717 741
718 r->hmac_set (octx); 742 r->hmac_set (octx);
… …
720 744
721 delete r; 745 delete r;
722} 746}
723 747
724void 748void
725connection::establish_connection_cb (time_watcher &w) 749connection::establish_connection_cb (ev::timer &w, int revents)
726{ 750{
727 if (!ictx 751 if (!ictx
728 && conf != THISNODE 752 && conf != THISNODE
729 && connectmode != conf_node::C_NEVER 753 && connectmode != conf_node::C_NEVER
730 && connectmode != conf_node::C_DISABLED 754 && connectmode != conf_node::C_DISABLED
731 && NOW > w.at) 755 && !w.is_active ())
732 { 756 {
733 double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; 757 ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
734 758 ? (retry_cnt & 3) + 1
735 if (retry_int < 3600 * 8) 759 : 1 << (retry_cnt >> 2));
736 retry_cnt++;
737
738 w.start (NOW + retry_int);
739 760
740 reset_si (); 761 reset_si ();
741 762
763 bool slow = si.prot & PROT_SLOW;
764
742 if (si.prot && !si.host) 765 if (si.prot && !si.host)
766 {
767 slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename);
768 /*TODO*/ /* start the timer so we don't recurse endlessly */
769 w.start (1);
743 vpn->send_connect_request (conf->id); 770 vpn->send_connect_request (conf->id);
771 }
744 else 772 else
745 { 773 {
774 slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx);
775
746 const sockinfo &dsi = forward_si (si); 776 const sockinfo &dsi = forward_si (si);
777
778 slow = slow || (dsi.prot & PROT_SLOW);
747 779
748 if (dsi.valid () && auth_rate_limiter.can (dsi)) 780 if (dsi.valid () && auth_rate_limiter.can (dsi))
749 { 781 {
750 if (retry_cnt < 4) 782 if (retry_cnt < 4)
751 send_auth_request (dsi, true); 783 send_auth_request (dsi, true);
752 else 784 else
753 send_ping (dsi, 0); 785 send_ping (dsi, 0);
754 } 786 }
755 } 787 }
788
789 retry_int *= slow ? 8. : 0.7;
790
791 if (retry_int < conf->max_retry)
792 retry_cnt++;
793 else
794 retry_int = conf->max_retry;
795
796 w.start (retry_int);
756 } 797 }
757} 798}
758 799
759void 800void
760connection::reset_connection () 801connection::reset_connection ()
… …
763 { 804 {
764 slog (L_INFO, _("%s(%s): connection lost"), 805 slog (L_INFO, _("%s(%s): connection lost"),
765 conf->nodename, (const char *)si); 806 conf->nodename, (const char *)si);
766 807
767 if (::conf.script_node_down) 808 if (::conf.script_node_down)
768 run_script (run_script_cb (this, &connection::script_node_down), false); 809 if (!run_script (run_script_cb (this, &connection::script_node_down), false))
810 slog (L_WARN, _("node-down command execution failed, continuing."));
769 } 811 }
770 812
771 delete ictx; ictx = 0; 813 delete ictx; ictx = 0;
772 delete octx; octx = 0; 814 delete octx; octx = 0;
815#if ENABLE_DNS
816 dnsv4_reset_connection ();
817#endif
773 818
774 si.host= 0; 819 si.host = 0;
775 820
776 last_activity = 0; 821 last_activity = 0;
777 retry_cnt = 0; 822 retry_cnt = 0;
778 823
779 rekey.stop (); 824 rekey.stop ();
… …
789 834
790 reset_connection (); 835 reset_connection ();
791} 836}
792 837
793void 838void
794connection::rekey_cb (time_watcher &w) 839connection::rekey_cb (ev::timer &w, int revents)
795{ 840{
796 reset_connection (); 841 reset_connection ();
797 establish_connection (); 842 establish_connection ();
798} 843}
799 844
… …
821{ 866{
822 if (ictx && octx) 867 if (ictx && octx)
823 send_data_packet (pkt); 868 send_data_packet (pkt);
824 else 869 else
825 { 870 {
826 if (!broadcast)//DDDD 871 if (!broadcast)
827 data_queue.put (new tap_packet (*pkt)); 872 data_queue.put (new tap_packet (*pkt));
828 873
829 establish_connection (); 874 establish_connection ();
830 } 875 }
831} 876}
… …
843} 888}
844 889
845void 890void
846connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) 891connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
847{ 892{
848 last_activity = NOW; 893 last_activity = ev::ev_now ();
849 894
850 slog (L_NOISE, "<<%d received packet type %d from %d to %d", 895 slog (L_NOISE, "<<%d received packet type %d from %d to %d",
851 conf->id, pkt->typ (), pkt->src (), pkt->dst ()); 896 conf->id, pkt->typ (), pkt->src (), pkt->dst ());
897
898 if (connectmode == conf_node::C_DISABLED)
899 return;
852 900
853 switch (pkt->typ ()) 901 switch (pkt->typ ())
854 { 902 {
855 case vpn_packet::PT_PING: 903 case vpn_packet::PT_PING:
856 // we send pings instead of auth packets after some retries, 904 // we send pings instead of auth packets after some retries,
… …
917 965
918 octx = new crypto_ctx (k, 1); 966 octx = new crypto_ctx (k, 1);
919 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; 967 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;
920 968
921 conf->protocols = p->protocols; 969 conf->protocols = p->protocols;
970 features = p->features & config_packet::get_features ();
922 971
923 send_auth_response (rsi, p->id, k); 972 send_auth_response (rsi, p->id, k);
924 973
925 connection_established (); 974 connection_established ();
926 975
… …
990 slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), 1039 slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
991 conf->nodename, (const char *)rsi, 1040 conf->nodename, (const char *)rsi,
992 p->prot_major, p->prot_minor); 1041 p->prot_major, p->prot_minor);
993 1042
994 if (::conf.script_node_up) 1043 if (::conf.script_node_up)
995 run_script (run_script_cb (this, &connection::script_node_up), false); 1044 if (!run_script (run_script_cb (this, &connection::script_node_up), false))
1045 slog (L_WARN, _("node-up command execution failed, continuing."));
996 1046
997 break; 1047 break;
998 } 1048 }
999 else 1049 else
1000 slog (L_ERR, _("%s(%s): sent and received challenge do not match"), 1050 slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
… …
1034 { 1084 {
1035 vpn->tap->send (d); 1085 vpn->tap->send (d);
1036 1086
1037 if (si != rsi) 1087 if (si != rsi)
1038 { 1088 {
1039 // fast re-sync on connection changes, useful especially for tcp/ip 1089 // fast re-sync on source address changes, useful especially for tcp/ip
1040 si = rsi; 1090 si = rsi;
1041 1091
1042 slog (L_INFO, _("%s(%s): socket address changed to %s"), 1092 slog (L_INFO, _("%s(%s): socket address changed to %s"),
1043 conf->nodename, (const char *)si, (const char *)rsi); 1093 conf->nodename, (const char *)si, (const char *)rsi);
1044 } 1094 }
1045
1046 delete d;
1047
1048 break;
1049 } 1095 }
1096
1097 delete d;
1098 break;
1050 } 1099 }
1051 } 1100 }
1052 1101
1053 send_reset (rsi); 1102 send_reset (rsi);
1054 break; 1103 break;
… …
1056 case vpn_packet::PT_CONNECT_REQ: 1105 case vpn_packet::PT_CONNECT_REQ:
1057 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) 1106 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1058 { 1107 {
1059 connect_req_packet *p = (connect_req_packet *) pkt; 1108 connect_req_packet *p = (connect_req_packet *) pkt;
1060 1109
1061 assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything 1110 if (p->id > 0 && p->id <= vpn->conns.size ())
1062 connection *c = vpn->conns[p->id - 1];
1063 conf->protocols = p->protocols;
1064
1065 slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1066 conf->id, p->id, c->ictx && c->octx);
1067
1068 if (c->ictx && c->octx)
1069 { 1111 {
1112 connection *c = vpn->conns[p->id - 1];
1113 conf->protocols = p->protocols;
1114
1115 slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]",
1116 conf->id, p->id, c->ictx && c->octx);
1117
1118 if (c->ictx && c->octx)
1119 {
1070 // send connect_info packets to both sides, in case one is 1120 // send connect_info packets to both sides, in case one is
1071 // behind a nat firewall (or both ;) 1121 // behind a nat firewall (or both ;)
1072 c->send_connect_info (conf->id, si, conf->protocols); 1122 c->send_connect_info (conf->id, si, conf->protocols);
1073 send_connect_info (c->conf->id, c->si, c->conf->protocols); 1123 send_connect_info (c->conf->id, c->si, c->conf->protocols);
1124 }
1125 else
1126 c->establish_connection ();
1074 } 1127 }
1075 else 1128 else
1076 c->establish_connection (); 1129 slog (L_WARN,
1130 _("received authenticated connection request from unknown node #%d, config file mismatch?"),
1131 p->id);
1077 } 1132 }
1078 1133
1079 break; 1134 break;
1080 1135
1081 case vpn_packet::PT_CONNECT_INFO: 1136 case vpn_packet::PT_CONNECT_INFO:
1082 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) 1137 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1083 { 1138 {
1084 connect_info_packet *p = (connect_info_packet *) pkt; 1139 connect_info_packet *p = (connect_info_packet *)pkt;
1085 1140
1086 assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything 1141 if (p->id > 0 && p->id <= vpn->conns.size ())
1087 1142 {
1088 connection *c = vpn->conns[p->id - 1]; 1143 connection *c = vpn->conns[p->id - 1];
1089 1144
1090 c->conf->protocols = p->protocols; 1145 c->conf->protocols = p->protocols;
1091 protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); 1146 protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1092 p->si.upgrade_protocol (protocol, c->conf); 1147 p->si.upgrade_protocol (protocol, c->conf);
1093 1148
1094 slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", 1149 slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",
1095 conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); 1150 conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);
1096 1151
1097 const sockinfo &dsi = forward_si (p->si); 1152 const sockinfo &dsi = forward_si (p->si);
1098 1153
1099 if (dsi.valid ()) 1154 if (dsi.valid ())
1100 c->send_auth_request (dsi, true); 1155 c->send_auth_request (dsi, true);
1156 }
1157 else
1158 slog (L_WARN,
1159 _("received authenticated connection request from unknown node #%d, config file mismatch?"),
1160 p->id);
1101 } 1161 }
1102 1162
1103 break; 1163 break;
1104 1164
1105 default: 1165 default:
1106 send_reset (rsi); 1166 send_reset (rsi);
1107 break; 1167 break;
1108 } 1168 }
1109} 1169}
1110 1170
1111void connection::keepalive_cb (time_watcher &w) 1171void connection::keepalive_cb (ev::timer &w, int revents)
1112{ 1172{
1113 if (NOW >= last_activity + ::conf.keepalive + 30) 1173 if (ev::ev_now () >= last_activity + ::conf.keepalive + 30)
1114 { 1174 {
1115 reset_connection (); 1175 reset_connection ();
1116 establish_connection (); 1176 establish_connection ();
1117 } 1177 }
1118 else if (NOW < last_activity + ::conf.keepalive) 1178 else if (ev::ev_now () < last_activity + ::conf.keepalive)
1119 w.start (last_activity + ::conf.keepalive); 1179 w.start (last_activity + ::conf.keepalive - ev::now ());
1120 else if (conf->connectmode != conf_node::C_ONDEMAND 1180 else if (conf->connectmode != conf_node::C_ONDEMAND
1121 || THISNODE->connectmode != conf_node::C_ONDEMAND) 1181 || THISNODE->connectmode != conf_node::C_ONDEMAND)
1122 { 1182 {
1123 send_ping (si); 1183 send_ping (si);
1124 w.start (NOW + 5); 1184 w.start (5);
1125 } 1185 }
1126 else if (NOW < last_activity + ::conf.keepalive + 10) 1186 else if (ev::ev_now () < last_activity + ::conf.keepalive + 10)
1127 // hold ondemand connections implicitly a few seconds longer 1187 // hold ondemand connections implicitly a few seconds longer
1128 // should delete octx, though, or something like that ;) 1188 // should delete octx, though, or something like that ;)
1129 w.start (last_activity + ::conf.keepalive + 10); 1189 w.start (last_activity + ::conf.keepalive + 10 - ev::now ());
1130 else 1190 else
1131 reset_connection (); 1191 reset_connection ();
1132} 1192}
1133 1193
1134void connection::send_connect_request (int id) 1194void connection::send_connect_request (int id)
… …
1140 send_vpn_packet (p, si); 1200 send_vpn_packet (p, si);
1141 1201
1142 delete p; 1202 delete p;
1143} 1203}
1144 1204
1205void connection::script_init_env (const char *ext)
1206{
1207 char *env;
1208 asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1209 asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1210 asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1211 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1212 conf->id & 0xff); putenv (env);
1213}
1214
1145void connection::script_node () 1215void connection::script_init_connect_env ()
1146{ 1216{
1147 vpn->script_if_up (); 1217 vpn->script_init_env ();
1148 1218
1149 char *env; 1219 char *env;
1150 asprintf (&env, "DESTID=%d", conf->id); putenv (env); 1220 asprintf (&env, "DESTID=%d", conf->id); putenv (env);
1151 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); 1221 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1152 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); 1222 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1153 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); 1223 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1154} 1224}
1155 1225
1156const char *connection::script_node_up () 1226const char *connection::script_node_up ()
1157{ 1227{
1158 script_node (); 1228 script_init_connect_env ();
1159 1229
1160 putenv ("STATE=up"); 1230 putenv ((char *)"STATE=up");
1161 1231
1232 char *filename;
1233 asprintf (&filename,
1234 "%s/%s",
1235 confbase,
1162 return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; 1236 ::conf.script_node_up ? ::conf.script_node_up : "node-up");
1237
1238 return filename;
1163} 1239}
1164 1240
1165const char *connection::script_node_down () 1241const char *connection::script_node_down ()
1166{ 1242{
1167 script_node (); 1243 script_init_connect_env ();
1168 1244
1169 putenv ("STATE=down"); 1245 putenv ((char *)"STATE=down");
1170 1246
1171 return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; 1247 char *filename;
1172} 1248 asprintf (&filename,
1249 "%s/%s",
1250 confbase,
1251 ::conf.script_node_down ? ::conf.script_node_down : "node-down");
1173 1252
1253 return filename;
1254}
1255
1174connection::connection(struct vpn *vpn_) 1256connection::connection (struct vpn *vpn, conf_node *conf)
1175: vpn(vpn_) 1257: vpn(vpn), conf(conf)
1176, rekey (this, &connection::rekey_cb) 1258, rekey (this, &connection::rekey_cb)
1177, keepalive (this, &connection::keepalive_cb) 1259, keepalive (this, &connection::keepalive_cb)
1178, establish_connection (this, &connection::establish_connection_cb) 1260, establish_connection (this, &connection::establish_connection_cb)
1261#if ENABLE_DNS
1262, dns (0)
1263#endif
1179{ 1264{
1180 octx = ictx = 0; 1265 octx = ictx = 0;
1181 retry_cnt = 0; 1266 retry_cnt = 0;
1182 1267
1268 if (!conf->protocols) // make sure some protocol is enabled
1269 conf->protocols = PROT_UDPv4;
1270
1183 connectmode = conf_node::C_ALWAYS; // initial setting 1271 connectmode = conf_node::C_ALWAYS; // initial setting
1184 reset_connection (); 1272 reset_connection ();
1185} 1273}
1186 1274
1187connection::~connection () 1275connection::~connection ()

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