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Comparing gvpe/src/connection.C (file contents):
Revision 1.74 by pcg, Sun Aug 10 02:49:21 2008 UTC vs.
Revision 1.91 by root, Tue Feb 8 23:13:48 2011 UTC

1/* 1/*
2 connection.C -- manage a single connection 2 connection.C -- manage a single connection
3 Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de> 3 Copyright (C) 2003-2008,2010 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 it 7 GVPE is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by the 8 under the terms of the GNU General Public License as published by the
… …
50 50
51#if !HAVE_RAND_PSEUDO_BYTES 51#if !HAVE_RAND_PSEUDO_BYTES
52# define RAND_pseudo_bytes RAND_bytes 52# define RAND_pseudo_bytes RAND_bytes
53#endif 53#endif
54 54
55#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic 55#define MAGIC_OLD "vped\xbd\xc6\xdb\x82" // 8 bytes of magic (still used in the protocol)
56#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic (understood but not generated)
56 57
57#define ULTRA_FAST 1 58#define ULTRA_FAST 1
58#define HLOG 15 59#define HLOG 15
59#include "lzf/lzf.h" 60#include "lzf/lzf.h"
60#include "lzf/lzf_c.c" 61#include "lzf/lzf_c.c"
… …
63////////////////////////////////////////////////////////////////////////////// 64//////////////////////////////////////////////////////////////////////////////
64 65
65static std::queue< std::pair<run_script_cb *, const char *> > rs_queue; 66static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
66static ev::child rs_child_ev; 67static ev::child rs_child_ev;
67 68
69namespace
70{
68void // c++ requires external linkage here, apparently :( 71 void // c++ requires external linkage here, apparently :(
69rs_child_cb (ev::child &w, int revents) 72 rs_child_cb (ev::child &w, int revents)
70{ 73 {
71 w.stop (); 74 w.stop ();
72 75
73 if (rs_queue.empty ()) 76 if (rs_queue.empty ())
74 return; 77 return;
75 78
76 pid_t pid = run_script (*rs_queue.front ().first, false); 79 pid_t pid = run_script (*rs_queue.front ().first, false);
77 if (pid) 80 if (pid)
78 { 81 {
79 w.set (pid); 82 w.set (pid);
80 w.start (); 83 w.start ();
81 } 84 }
82 else 85 else
83 slog (L_WARN, rs_queue.front ().second); 86 slog (L_WARN, rs_queue.front ().second);
84 87
85 delete rs_queue.front ().first; 88 delete rs_queue.front ().first;
86 rs_queue.pop (); 89 rs_queue.pop ();
87} 90 }
91};
88 92
89// despite the fancy name, this is quite a hack 93// despite the fancy name, this is quite a hack
90static void 94static void
91run_script_queued (run_script_cb *cb, const char *warnmsg) 95run_script_queued (run_script_cb *cb, const char *warnmsg)
92{ 96{
… …
190 cleaner.set (RSA_TTL, RSA_TTL); 194 cleaner.set (RSA_TTL, RSA_TTL);
191 } 195 }
192 196
193} rsa_cache; 197} rsa_cache;
194 198
199void
195void rsa_cache::cleaner_cb (ev::timer &w, int revents) 200rsa_cache::cleaner_cb (ev::timer &w, int revents)
196{ 201{
197 if (empty ()) 202 if (empty ())
198 w.stop (); 203 w.stop ();
199 else 204 else
200 { 205 {
… …
225 delete p; 230 delete p;
226 231
227 delete [] queue; 232 delete [] queue;
228} 233}
229 234
235void
230void pkt_queue::expire_cb (ev::timer &w, int revents) 236pkt_queue::expire_cb (ev::timer &w, int revents)
231{ 237{
232 ev_tstamp expire = ev_now () - max_ttl; 238 ev_tstamp expire = ev_now () - max_ttl;
233 239
234 for (;;) 240 for (;;)
235 { 241 {
… …
246 252
247 delete get (); 253 delete get ();
248 } 254 }
249} 255}
250 256
257void
251void pkt_queue::put (net_packet *p) 258pkt_queue::put (net_packet *p)
252{ 259{
253 ev_tstamp now = ev_now (); 260 ev_tstamp now = ev_now ();
254 261
255 // start expiry timer 262 // start expiry timer
256 if (empty ()) 263 if (empty ())
… …
265 queue[i].tstamp = now; 272 queue[i].tstamp = now;
266 273
267 i = ni; 274 i = ni;
268} 275}
269 276
270net_packet *pkt_queue::get () 277net_packet *
278pkt_queue::get ()
271{ 279{
272 if (empty ()) 280 if (empty ())
273 return 0; 281 return 0;
274 282
275 net_packet *p = queue[j].pkt; 283 net_packet *p = queue[j].pkt;
… …
299 307
300 bool can (const sockinfo &si) { return can((u32)si.host); } 308 bool can (const sockinfo &si) { return can((u32)si.host); }
301 bool can (u32 host); 309 bool can (u32 host);
302}; 310};
303 311
304net_rate_limiter auth_rate_limiter, reset_rate_limiter; 312static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
305 313
314bool
306bool net_rate_limiter::can (u32 host) 315net_rate_limiter::can (u32 host)
307{ 316{
308 iterator i; 317 iterator i;
309 318
310 for (i = begin (); i != end (); ) 319 for (i = begin (); i != end (); )
311 if (i->host == host) 320 if (i->host == host)
… …
358 367
359///////////////////////////////////////////////////////////////////////////// 368/////////////////////////////////////////////////////////////////////////////
360 369
361unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE]; 370unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];
362 371
372void
363void hmac_packet::hmac_gen (crypto_ctx *ctx) 373hmac_packet::hmac_gen (crypto_ctx *ctx)
364{ 374{
365 unsigned int xlen; 375 unsigned int xlen;
366 376
367 HMAC_CTX *hctx = &ctx->hctx; 377 HMAC_CTX *hctx = &ctx->hctx;
368 378
… …
386 hmac_gen (ctx); 396 hmac_gen (ctx);
387 397
388 return !memcmp (hmac, hmac_digest, HMACLENGTH); 398 return !memcmp (hmac, hmac_digest, HMACLENGTH);
389} 399}
390 400
401void
391void vpn_packet::set_hdr (ptype type_, unsigned int dst) 402vpn_packet::set_hdr (ptype type_, unsigned int dst)
392{ 403{
393 type = type_; 404 type = type_;
394 405
395 int src = THISNODE->id; 406 int src = THISNODE->id;
396 407
… …
401 412
402#define MAXVPNDATA (MAX_MTU - 6 - 6) 413#define MAXVPNDATA (MAX_MTU - 6 - 6)
403#define DATAHDR (sizeof (u32) + RAND_SIZE) 414#define DATAHDR (sizeof (u32) + RAND_SIZE)
404 415
405struct vpndata_packet : vpn_packet 416struct vpndata_packet : vpn_packet
417{
418 u8 data[MAXVPNDATA + DATAHDR]; // seqno
419
420 void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
421 tap_packet *unpack (connection *conn, u32 &seqno);
422
423private:
424 const u32 data_hdr_size () const
406 { 425 {
407 u8 data[MAXVPNDATA + DATAHDR]; // seqno
408
409 void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
410 tap_packet *unpack (connection *conn, u32 &seqno);
411private:
412
413 const u32 data_hdr_size () const
414 {
415 return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; 426 return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
416 }
417 }; 427 }
428};
418 429
419void 430void
420vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) 431vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
421{ 432{
422 EVP_CIPHER_CTX *cctx = &conn->octx->cctx; 433 EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
… …
424 ptype type = PT_DATA_UNCOMPRESSED; 435 ptype type = PT_DATA_UNCOMPRESSED;
425 436
426#if ENABLE_COMPRESSION 437#if ENABLE_COMPRESSION
427 u8 cdata[MAX_MTU]; 438 u8 cdata[MAX_MTU];
428 439
429 if (conn->features & ENABLE_COMPRESSION) 440 if (conn->features & FEATURE_COMPRESSION)
430 { 441 {
431 u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); 442 u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
432 443
433 if (cl) 444 if (cl)
434 { 445 {
… …
561#endif 572#endif
562 return f; 573 return f;
563 } 574 }
564}; 575};
565 576
577void
566void config_packet::setup (ptype type, int dst) 578config_packet::setup (ptype type, int dst)
567{ 579{
568 prot_major = PROTOCOL_MAJOR; 580 prot_major = PROTOCOL_MAJOR;
569 prot_minor = PROTOCOL_MINOR; 581 prot_minor = PROTOCOL_MINOR;
570 randsize = RAND_SIZE; 582 randsize = RAND_SIZE;
571 hmaclen = HMACLENGTH; 583 hmaclen = HMACLENGTH;
… …
579 591
580 len = sizeof (*this) - sizeof (net_packet); 592 len = sizeof (*this) - sizeof (net_packet);
581 set_hdr (type, dst); 593 set_hdr (type, dst);
582} 594}
583 595
596bool
584bool config_packet::chk_config () const 597config_packet::chk_config () const
585{ 598{
586 if (prot_major != PROTOCOL_MAJOR) 599 if (prot_major != PROTOCOL_MAJOR)
587 slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); 600 slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
588 else if (randsize != RAND_SIZE) 601 else if (randsize != RAND_SIZE)
589 slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); 602 slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
… …
613 rsaencrdata encr; 626 rsaencrdata encr;
614 627
615 auth_req_packet (int dst, bool initiate_, u8 protocols_) 628 auth_req_packet (int dst, bool initiate_, u8 protocols_)
616 { 629 {
617 config_packet::setup (PT_AUTH_REQ, dst); 630 config_packet::setup (PT_AUTH_REQ, dst);
618 strncpy (magic, MAGIC, 8); 631 strncpy (magic, MAGIC_OLD, 8);
619 initiate = !!initiate_; 632 initiate = !!initiate_;
620 protocols = protocols_; 633 protocols = protocols_;
621 634
622 len = sizeof (*this) - sizeof (net_packet); 635 len = sizeof (*this) - sizeof (net_packet);
623 } 636 }
… …
672///////////////////////////////////////////////////////////////////////////// 685/////////////////////////////////////////////////////////////////////////////
673 686
674void 687void
675connection::connection_established () 688connection::connection_established ()
676{ 689{
677 slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx); 690 slog (L_NOISE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx);
678 691
679 if (ictx && octx) 692 if (ictx && octx)
680 { 693 {
681 // make sure rekeying timeouts are slightly asymmetric 694 // make sure rekeying timeouts are slightly asymmetric
682 ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); 695 ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
… …
760{ 773{
761 ping_packet *pkt = new ping_packet; 774 ping_packet *pkt = new ping_packet;
762 775
763 pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); 776 pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
764 777
765 slog (L_TRACE, ">>%d %s [%s]", conf->id, pong ? "PT_PONG" : "PT_PING", (const char *)si); 778 slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
766 779
767 send_vpn_packet (pkt, si, IPTOS_LOWDELAY); 780 send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
768 781
769 delete pkt; 782 delete pkt;
770} 783}
… …
790 803
791 rsachallenge chg; 804 rsachallenge chg;
792 rsa_cache.gen (pkt->id, chg); 805 rsa_cache.gen (pkt->id, chg);
793 rsa_encrypt (conf->rsa_key, chg, pkt->encr); 806 rsa_encrypt (conf->rsa_key, chg, pkt->encr);
794 807
795 slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); 808 slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
796 809
797 send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly 810 send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
798 811
799 delete pkt; 812 delete pkt;
800} 813}
… …
808 821
809 rsa_hash (id, chg, pkt->response); 822 rsa_hash (id, chg, pkt->response);
810 823
811 pkt->hmac_set (octx); 824 pkt->hmac_set (octx);
812 825
813 slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si); 826 slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
814 827
815 send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly 828 send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
816 829
817 delete pkt; 830 delete pkt;
818} 831}
819 832
820void 833void
821connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) 834connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
822{ 835{
823 slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)", 836 slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s)", conf->nodename,
824 conf->id, rid, (const char *)rsi); 837 vpn->conns[rid - 1]->conf->nodename, (const char *)rsi);
825 838
826 connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); 839 connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
827 840
828 r->hmac_set (octx); 841 r->hmac_set (octx);
829 send_vpn_packet (r, si); 842 send_vpn_packet (r, si);
… …
983 data_queue.put (new tap_packet (*pkt)); 996 data_queue.put (new tap_packet (*pkt));
984 post_inject_queue (); 997 post_inject_queue ();
985 } 998 }
986} 999}
987 1000
1001void
988void connection::inject_vpn_packet (vpn_packet *pkt, int tos) 1002connection::inject_vpn_packet (vpn_packet *pkt, int tos)
989{ 1003{
990 if (ictx && octx) 1004 if (ictx && octx)
991 send_vpn_packet (pkt, si, tos); 1005 send_vpn_packet (pkt, si, tos);
992 else 1006 else
993 { 1007 {
… …
999void 1013void
1000connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) 1014connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
1001{ 1015{
1002 last_activity = ev_now (); 1016 last_activity = ev_now ();
1003 1017
1004 slog (L_NOISE, "<<%d received packet type %d from %d to %d.", 1018 slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
1005 conf->id, pkt->typ (), pkt->src (), pkt->dst ()); 1019 conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
1006 1020
1007 if (connectmode == conf_node::C_DISABLED) 1021 if (connectmode == conf_node::C_DISABLED)
1008 return; 1022 return;
1009 1023
1010 switch (pkt->typ ()) 1024 switch (pkt->typ ())
1011 { 1025 {
1012 case vpn_packet::PT_PING: 1026 case vpn_packet::PT_PING:
1027 slog (L_TRACE, "%s >> PT_PING", conf->nodename);
1028
1013 // we send pings instead of auth packets after some retries, 1029 // we send pings instead of auth packets after some retries,
1014 // so reset the retry counter and establish a connection 1030 // so reset the retry counter and establish a connection
1015 // when we receive a ping. 1031 // when we receive a ping.
1016 if (!ictx) 1032 if (!ictx)
1017 { 1033 {
1018 if (auth_rate_limiter.can (rsi)) 1034 if (auth_rate_limiter.can (rsi))
1019 send_auth_request (rsi, true); 1035 send_auth_request (rsi, true);
1020 } 1036 }
1021 else 1037 else
1022 // we would love to change thre socket address here, but ping's aren't 1038 // we would love to change the socket address here, but ping's aren't
1023 // authenticated, so we best ignore it. 1039 // authenticated, so we best ignore it.
1024 send_ping (rsi, 1); // pong 1040 send_ping (rsi, 1); // pong
1025 1041
1026 break; 1042 break;
1027 1043
1028 case vpn_packet::PT_PONG: 1044 case vpn_packet::PT_PONG:
1045 slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
1046
1047 // a PONG might mean that the other side doesn't really know
1048 // about our desire for communication.
1049 establish_connection ();
1029 break; 1050 break;
1030 1051
1031 case vpn_packet::PT_RESET: 1052 case vpn_packet::PT_RESET:
1032 { 1053 {
1033 reset_connection (); 1054 reset_connection ();
… …
1048 case vpn_packet::PT_AUTH_REQ: 1069 case vpn_packet::PT_AUTH_REQ:
1049 if (auth_rate_limiter.can (rsi)) 1070 if (auth_rate_limiter.can (rsi))
1050 { 1071 {
1051 auth_req_packet *p = (auth_req_packet *) pkt; 1072 auth_req_packet *p = (auth_req_packet *) pkt;
1052 1073
1053 slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate); 1074 slog (L_TRACE, "%s >> PT_AUTH_REQ(%s)", conf->nodename, p->initiate ? "initiate" : "reply");
1054 1075
1055 if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) 1076 if (p->chk_config ()
1077 && (!strncmp (p->magic, MAGIC_OLD, 8) || !strncmp (p->magic, MAGIC, 8)))
1056 { 1078 {
1057 if (p->prot_minor != PROTOCOL_MINOR) 1079 if (p->prot_minor != PROTOCOL_MINOR)
1058 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), 1080 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
1059 conf->nodename, (const char *)rsi, 1081 conf->nodename, (const char *)rsi,
1060 PROTOCOL_MINOR, conf->nodename, p->prot_minor); 1082 PROTOCOL_MINOR, conf->nodename, p->prot_minor);
… …
1096 1118
1097 break; 1119 break;
1098 1120
1099 case vpn_packet::PT_AUTH_RES: 1121 case vpn_packet::PT_AUTH_RES:
1100 { 1122 {
1101 auth_res_packet *p = (auth_res_packet *) pkt; 1123 auth_res_packet *p = (auth_res_packet *)pkt;
1102 1124
1103 slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); 1125 slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
1104 1126
1105 if (p->chk_config ()) 1127 if (p->chk_config ())
1106 { 1128 {
1107 if (p->prot_minor != PROTOCOL_MINOR) 1129 if (p->prot_minor != PROTOCOL_MINOR)
1108 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), 1130 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
… …
1143 iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid 1165 iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1144 1166
1145 si = rsi; 1167 si = rsi;
1146 protocol = rsi.prot; 1168 protocol = rsi.prot;
1147 1169
1148 slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d."), 1170 slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
1149 conf->nodename, (const char *)rsi, 1171 conf->nodename, (const char *)rsi,
1172 is_direct ? "direct" : "forwarded",
1150 p->prot_major, p->prot_minor); 1173 p->prot_major, p->prot_minor);
1151 1174
1152 connection_established (); 1175 connection_established ();
1153 1176
1154 if (::conf.script_node_up) 1177 if (::conf.script_node_up)
… …
1202 if (si != rsi) 1225 if (si != rsi)
1203 { 1226 {
1204 // fast re-sync on source address changes, useful especially for tcp/ip 1227 // fast re-sync on source address changes, useful especially for tcp/ip
1205 //if (last_si_change < ev_now () + 5.) 1228 //if (last_si_change < ev_now () + 5.)
1206 // { 1229 // {
1230 slog (L_INFO, _("%s(%s): changing socket address to %s."),
1231 conf->nodename, (const char *)si, (const char *)rsi);
1232
1207 si = rsi; 1233 si = rsi;
1208 1234
1209 slog (L_INFO, _("%s(%s): socket address changed to %s."), 1235 if (::conf.script_node_change)
1210 conf->nodename, (const char *)si, (const char *)rsi); 1236 {
1237 run_script_cb *cb = new run_script_cb;
1238 cb->set<connection, &connection::script_node_change> (this);
1239 run_script_queued (cb, _("node-change command execution failed, continuing."));
1240 }
1241
1211 // } 1242 // }
1212 //else 1243 //else
1213 // slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."), 1244 // slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
1214 // conf->nodename, (const char *)si, (const char *)rsi); 1245 // conf->nodename, (const char *)si, (const char *)rsi);
1215 } 1246 }
1216 } 1247 }
1217 else if (seqclass == 1) // silently ignore 1248 else if (seqclass == 1) // far history
1249 slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
1250 "possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
1251 else if (seqclass == 2) // in-window duplicate, happens often on wireless
1218 slog (L_ERR, _("received duplicate packet (received %08lx, expected %08lx)\n" 1252 slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
1219 "possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1); 1253 "possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
1220 else if (seqclass == 2) // reset 1254 else if (seqclass == 3) // reset
1221 { 1255 {
1222 slog (L_ERR, _("received duplicate or out-of-sync packet (received %08lx, expected %08lx)\n" 1256 slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
1223 "possible replay attack, or just massive packet loss, resetting connection."), seqno, iseqno.seq + 1); 1257 "probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
1224 send_reset (rsi); 1258 send_reset (rsi);
1225 } 1259 }
1226 1260
1227 delete d; 1261 delete d;
1228 break; 1262 break;
… …
1233 break; 1267 break;
1234 1268
1235 case vpn_packet::PT_CONNECT_REQ: 1269 case vpn_packet::PT_CONNECT_REQ:
1236 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) 1270 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1237 { 1271 {
1238 connect_req_packet *p = (connect_req_packet *) pkt; 1272 connect_req_packet *p = (connect_req_packet *)pkt;
1239 1273
1240 if (p->id > 0 && p->id <= vpn->conns.size ()) 1274 if (p->id > 0 && p->id <= vpn->conns.size ())
1241 { 1275 {
1242 connection *c = vpn->conns[p->id - 1]; 1276 connection *c = vpn->conns[p->id - 1];
1243 conf->protocols = p->protocols; 1277 conf->protocols = p->protocols;
1244 1278
1245 slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]", 1279 slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s) [%d]",
1246 conf->id, p->id, c->ictx && c->octx); 1280 conf->nodename, vpn->conns[p->id - 1]->conf->nodename, c->ictx && c->octx);
1247 1281
1248 if (c->ictx && c->octx) 1282 if (c->ictx && c->octx)
1249 { 1283 {
1250 // send connect_info packets to both sides, in case one is 1284 // send connect_info packets to both sides, in case one is
1251 // behind a nat firewall (or both ;) 1285 // behind a nat firewall (or both ;)
… …
1274 1308
1275 c->conf->protocols = p->protocols; 1309 c->conf->protocols = p->protocols;
1276 protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); 1310 protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1277 p->si.upgrade_protocol (protocol, c->conf); 1311 p->si.upgrade_protocol (protocol, c->conf);
1278 1312
1279 slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", 1313 slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s) [%d]",
1314 conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
1280 conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); 1315 (const char *)p->si, !c->ictx && !c->octx);
1281 1316
1282 const sockinfo &dsi = forward_si (p->si); 1317 const sockinfo &dsi = forward_si (p->si);
1283 1318
1284 if (dsi.valid ()) 1319 if (dsi.valid ())
1285 c->send_auth_request (dsi, true); 1320 c->send_auth_request (dsi, true);
… …
1299} 1334}
1300 1335
1301inline void 1336inline void
1302connection::keepalive_cb (ev::timer &w, int revents) 1337connection::keepalive_cb (ev::timer &w, int revents)
1303{ 1338{
1304 if (ev_now () >= last_activity + ::conf.keepalive + 30) 1339 if (ev_now () >= last_activity + ::conf.keepalive + 15)
1305 { 1340 {
1306 reset_connection (); 1341 reset_connection ();
1307 establish_connection (); 1342 establish_connection ();
1308 } 1343 }
1309 else if (ev_now () < last_activity + ::conf.keepalive) 1344 else if (ev_now () < last_activity + ::conf.keepalive)
1310 w.start (last_activity + ::conf.keepalive - ev::now ()); 1345 w.start (last_activity + ::conf.keepalive - ev::now ());
1311 else if (conf->connectmode != conf_node::C_ONDEMAND 1346 else if (conf->connectmode != conf_node::C_ONDEMAND
1312 || THISNODE->connectmode != conf_node::C_ONDEMAND) 1347 || THISNODE->connectmode != conf_node::C_ONDEMAND)
1313 { 1348 {
1314 send_ping (si); 1349 send_ping (si);
1315 w.start (5); 1350 w.start (3);
1316 } 1351 }
1317 else if (ev_now () < last_activity + ::conf.keepalive + 10) 1352 else if (ev_now () < last_activity + ::conf.keepalive + 10)
1318 // hold ondemand connections implicitly a few seconds longer 1353 // hold ondemand connections implicitly a few seconds longer
1319 // should delete octx, though, or something like that ;) 1354 // should delete octx, though, or something like that ;)
1320 w.start (last_activity + ::conf.keepalive + 10 - ev::now ()); 1355 w.start (last_activity + ::conf.keepalive + 10 - ev::now ());
1321 else 1356 else
1322 reset_connection (); 1357 reset_connection ();
1323} 1358}
1324 1359
1360void
1325void connection::send_connect_request (int id) 1361connection::send_connect_request (int id)
1326{ 1362{
1327 connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); 1363 connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);
1328 1364
1329 slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); 1365 slog (L_TRACE, "%s << PT_CONNECT_REQ(%s)",
1366 conf->nodename, vpn->conns[id - 1]->conf->nodename);
1330 p->hmac_set (octx); 1367 p->hmac_set (octx);
1331 send_vpn_packet (p, si); 1368 send_vpn_packet (p, si);
1332 1369
1333 delete p; 1370 delete p;
1334} 1371}
1335 1372
1373void
1336void connection::script_init_env (const char *ext) 1374connection::script_init_env (const char *ext)
1337{ 1375{
1338 char *env; 1376 char *env;
1339 asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); 1377 asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1340 asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); 1378 asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1341 asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, 1379 asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1342 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, 1380 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1343 conf->id & 0xff); putenv (env); 1381 conf->id & 0xff); putenv (env);
1344} 1382}
1345 1383
1384void
1346void connection::script_init_connect_env () 1385connection::script_init_connect_env ()
1347{ 1386{
1348 vpn->script_init_env (); 1387 vpn->script_init_env ();
1349 1388
1350 char *env; 1389 char *env;
1351 asprintf (&env, "DESTID=%d", conf->id); putenv (env); 1390 asprintf (&env, "DESTID=%d", conf->id); putenv (env);
1391 asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1352 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); 1392 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1353 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); 1393 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1354 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); 1394 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1355} 1395}
1356 1396
1357inline const char * 1397inline const char *
1358connection::script_node_up () 1398connection::script_node_up ()
1359{ 1399{
… …
1364 char *filename; 1404 char *filename;
1365 asprintf (&filename, 1405 asprintf (&filename,
1366 "%s/%s", 1406 "%s/%s",
1367 confbase, 1407 confbase,
1368 ::conf.script_node_up ? ::conf.script_node_up : "node-up"); 1408 ::conf.script_node_up ? ::conf.script_node_up : "node-up");
1409
1410 return filename;
1411}
1412
1413inline const char *
1414connection::script_node_change ()
1415{
1416 script_init_connect_env ();
1417
1418 putenv ((char *)"STATE=change");
1419
1420 char *filename;
1421 asprintf (&filename,
1422 "%s/%s",
1423 confbase,
1424 ::conf.script_node_change ? ::conf.script_node_change : "node-change");
1369 1425
1370 return filename; 1426 return filename;
1371} 1427}
1372 1428
1373inline const char * 1429inline const char *
… …
1416connection::~connection () 1472connection::~connection ()
1417{ 1473{
1418 shutdown (); 1474 shutdown ();
1419} 1475}
1420 1476
1477void
1421void connection_init () 1478connection_init ()
1422{ 1479{
1423 auth_rate_limiter.clear (); 1480 auth_rate_limiter.clear ();
1424 reset_rate_limiter.clear (); 1481 reset_rate_limiter.clear ();
1425} 1482}
1426 1483

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