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Comparing gvpe/src/connection.C (file contents):
Revision 1.59 by pcg, Mon Dec 5 12:58:09 2005 UTC vs.
Revision 1.68 by pcg, Thu Aug 7 17:30:27 2008 UTC

… …
82 require (EVP_DigestUpdate(&ctx, &id, sizeof id)); 82 require (EVP_DigestUpdate(&ctx, &id, sizeof id));
83 require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); 83 require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
84 EVP_MD_CTX_cleanup (&ctx); 84 EVP_MD_CTX_cleanup (&ctx);
85} 85}
86 86
87struct rsa_entry { 87struct rsa_entry
88{
88 tstamp expire; 89 tstamp expire;
89 rsaid id; 90 rsaid id;
90 rsachallenge chg; 91 rsachallenge chg;
91}; 92};
92 93
93struct rsa_cache : list<rsa_entry> 94struct rsa_cache : list<rsa_entry>
94{ 95{
95 void cleaner_cb (time_watcher &w); time_watcher cleaner; 96 inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;
96 97
97 bool find (const rsaid &id, rsachallenge &chg) 98 bool find (const rsaid &id, rsachallenge &chg)
98 { 99 {
99 for (iterator i = begin (); i != end (); ++i) 100 for (iterator i = begin (); i != end (); ++i)
100 { 101 {
101 if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) 102 if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ())
102 { 103 {
103 memcpy (&chg, &i->chg, sizeof chg); 104 memcpy (&chg, &i->chg, sizeof chg);
104 105
105 erase (i); 106 erase (i);
106 return true; 107 return true;
107 } 108 }
108 } 109 }
109 110
110 if (cleaner.at < NOW) 111 if (!cleaner.is_active ())
111 cleaner.start (NOW + RSA_TTL); 112 cleaner.again ();
112 113
113 return false; 114 return false;
114 } 115 }
115 116
116 void gen (rsaid &id, rsachallenge &chg) 117 void gen (rsaid &id, rsachallenge &chg)
… …
118 rsa_entry e; 119 rsa_entry e;
119 120
120 RAND_bytes ((unsigned char *)&id, sizeof id); 121 RAND_bytes ((unsigned char *)&id, sizeof id);
121 RAND_bytes ((unsigned char *)&chg, sizeof chg); 122 RAND_bytes ((unsigned char *)&chg, sizeof chg);
122 123
123 e.expire = NOW + RSA_TTL; 124 e.expire = ev_now () + RSA_TTL;
124 e.id = id; 125 e.id = id;
125 memcpy (&e.chg, &chg, sizeof chg); 126 memcpy (&e.chg, &chg, sizeof chg);
126 127
127 push_back (e); 128 push_back (e);
128 129
129 if (cleaner.at < NOW) 130 if (!cleaner.is_active ())
130 cleaner.start (NOW + RSA_TTL); 131 cleaner.again ();
131 } 132 }
132 133
133 rsa_cache () 134 rsa_cache ()
134 : cleaner (this, &rsa_cache::cleaner_cb)
135 { } 135 {
136 cleaner.set<rsa_cache, &rsa_cache::cleaner_cb> (this);
137 cleaner.set (RSA_TTL, RSA_TTL);
138 }
136 139
137} rsa_cache; 140} rsa_cache;
138 141
139void rsa_cache::cleaner_cb (time_watcher &w) 142void rsa_cache::cleaner_cb (ev::timer &w, int revents)
140{ 143{
141 if (!empty ()) 144 if (empty ())
145 w.stop ();
146 else
142 { 147 {
143 w.start (NOW + RSA_TTL);
144
145 for (iterator i = begin (); i != end (); ) 148 for (iterator i = begin (); i != end (); )
146 if (i->expire <= NOW) 149 if (i->expire <= ev_now ())
147 i = erase (i); 150 i = erase (i);
148 else 151 else
149 ++i; 152 ++i;
150 } 153 }
151} 154}
152 155
153////////////////////////////////////////////////////////////////////////////// 156//////////////////////////////////////////////////////////////////////////////
154 157
155void pkt_queue::put (net_packet *p) 158pkt_queue::pkt_queue (double max_ttl, int max_queue)
159: max_ttl (max_ttl), max_queue (max_queue)
156{ 160{
157 if (queue[i]) 161 queue = new pkt [max_queue];
158 {
159 delete queue[i];
160 j = (j + 1) % QUEUEDEPTH;
161 }
162 162
163 queue[i] = p;
164
165 i = (i + 1) % QUEUEDEPTH;
166}
167
168net_packet *pkt_queue::get ()
169{
170 net_packet *p = queue[j];
171
172 if (p)
173 {
174 queue[j] = 0;
175 j = (j + 1) % QUEUEDEPTH;
176 }
177
178 return p;
179}
180
181pkt_queue::pkt_queue ()
182{
183 memset (queue, 0, sizeof (queue));
184 i = 0; 163 i = 0;
185 j = 0; 164 j = 0;
165
166 expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
186} 167}
187 168
188pkt_queue::~pkt_queue () 169pkt_queue::~pkt_queue ()
189{ 170{
190 for (i = QUEUEDEPTH; --i > 0; ) 171 while (net_packet *p = get ())
172 delete p;
173
191 delete queue[i]; 174 delete [] queue;
192} 175}
193 176
177void pkt_queue::expire_cb (ev::timer &w, int revents)
178{
179 ev_tstamp expire = ev_now () - max_ttl;
180
181 for (;;)
182 {
183 if (empty ())
184 break;
185
186 double diff = queue[j].tstamp - expire;
187
188 if (diff >= 0.)
189 {
190 w.start (diff > 0.5 ? diff : 0.5);
191 break;
192 }
193
194 delete get ();
195 }
196}
197
198void pkt_queue::put (net_packet *p)
199{
200 ev_tstamp now = ev_now ();
201
202 // start expiry timer
203 if (empty ())
204 expire.start (max_ttl);
205
206 int ni = i + 1 == max_queue ? 0 : i + 1;
207
208 if (ni == j)
209 delete get ();
210
211 queue[i].pkt = p;
212 queue[i].tstamp = now;
213
214 i = ni;
215}
216
217net_packet *pkt_queue::get ()
218{
219 if (empty ())
220 return 0;
221
222 net_packet *p = queue[j].pkt;
223 queue[j].pkt = 0;
224
225 j = j + 1 == max_queue ? 0 : j + 1;
226
227 return p;
228}
229
194struct net_rateinfo { 230struct net_rateinfo
231{
195 u32 host; 232 u32 host;
196 double pcnt, diff; 233 double pcnt, diff;
197 tstamp last; 234 tstamp last;
198}; 235};
199 236
… …
218 iterator i; 255 iterator i;
219 256
220 for (i = begin (); i != end (); ) 257 for (i = begin (); i != end (); )
221 if (i->host == host) 258 if (i->host == host)
222 break; 259 break;
223 else if (i->last < NOW - NRL_EXPIRE) 260 else if (i->last < ev_now () - NRL_EXPIRE)
224 i = erase (i); 261 i = erase (i);
225 else 262 else
226 i++; 263 i++;
227 264
228 if (i == end ()) 265 if (i == end ())
… …
230 net_rateinfo ri; 267 net_rateinfo ri;
231 268
232 ri.host = host; 269 ri.host = host;
233 ri.pcnt = 1.; 270 ri.pcnt = 1.;
234 ri.diff = NRL_MAXDIF; 271 ri.diff = NRL_MAXDIF;
235 ri.last = NOW; 272 ri.last = ev_now ();
236 273
237 push_front (ri); 274 push_front (ri);
238 275
239 return true; 276 return true;
240 } 277 }
… …
242 { 279 {
243 net_rateinfo ri (*i); 280 net_rateinfo ri (*i);
244 erase (i); 281 erase (i);
245 282
246 ri.pcnt = ri.pcnt * NRL_ALPHA; 283 ri.pcnt = ri.pcnt * NRL_ALPHA;
247 ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last); 284 ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
248 285
249 ri.last = NOW; 286 ri.last = ev_now ();
250 287
251 double dif = ri.diff / ri.pcnt; 288 double dif = ri.diff / ri.pcnt;
252 289
253 bool send = dif > NRL_CUTOFF; 290 bool send = dif > NRL_CUTOFF;
254 291
… …
582///////////////////////////////////////////////////////////////////////////// 619/////////////////////////////////////////////////////////////////////////////
583 620
584void 621void
585connection::connection_established () 622connection::connection_established ()
586{ 623{
624 slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx);
625
587 if (ictx && octx) 626 if (ictx && octx)
588 { 627 {
589 connectmode = conf->connectmode;
590
591 // make sure rekeying timeouts are slightly asymmetric 628 // make sure rekeying timeouts are slightly asymmetric
592 rekey.start (NOW + ::conf.rekey 629 ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
593 + (conf->id > THISNODE->id ? 10 : 0)); 630 rekey.start (rekey_interval, rekey_interval);
594 keepalive.start (NOW + ::conf.keepalive); 631 keepalive.start (::conf.keepalive);
595 632
596 // send queued packets 633 // send queued packets
597 if (ictx && octx) 634 if (ictx && octx)
598 { 635 {
599 while (tap_packet *p = (tap_packet *)data_queue.get ()) 636 while (tap_packet *p = (tap_packet *)data_queue.get ())
600 { 637 {
601 send_data_packet (p); 638 if (p->len) send_data_packet (p);
602 delete p; 639 delete p;
603 } 640 }
604 641
605 while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) 642 while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
606 { 643 {
607 send_vpn_packet (p, si, IPTOS_RELIABILITY); 644 if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
608 delete p; 645 delete p;
609 } 646 }
610 } 647 }
611 } 648 }
612 else 649 else
613 { 650 {
614 retry_cnt = 0; 651 retry_cnt = 0;
615 establish_connection.start (NOW + 5); 652 establish_connection.start (5);
616 keepalive.stop (); 653 keepalive.stop ();
617 rekey.stop (); 654 rekey.stop ();
618 } 655 }
619} 656}
620 657
… …
739 send_vpn_packet (r, si); 776 send_vpn_packet (r, si);
740 777
741 delete r; 778 delete r;
742} 779}
743 780
744void 781inline void
745connection::establish_connection_cb (time_watcher &w) 782connection::establish_connection_cb (ev::timer &w, int revents)
746{ 783{
747 if (!ictx 784 if (!ictx
748 && conf != THISNODE 785 && conf != THISNODE
749 && connectmode != conf_node::C_NEVER 786 && connectmode != conf_node::C_NEVER
750 && connectmode != conf_node::C_DISABLED 787 && connectmode != conf_node::C_DISABLED
751 && NOW > w.at) 788 && !w.is_active ())
752 { 789 {
753 w.at = TSTAMP_MAX; // first disable this watcher in case of recursion 790 // a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
791 // and stop trying. should probably be handled by a per-connection expire handler.
792 if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
793 {
794 reset_connection ();
795 return;
796 }
754 797
755 double retry_int = double (retry_cnt & 3 798 last_establish_attempt = ev_now ();
799
800 ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
756 ? (retry_cnt & 3) + 1 801 ? (retry_cnt & 3) + 1
757 : 1 << (retry_cnt >> 2)); 802 : 1 << (retry_cnt >> 2));
758 803
759 reset_si (); 804 reset_si ();
760 805
761 bool slow = si.prot & PROT_SLOW; 806 bool slow = si.prot & PROT_SLOW;
762 807
763 if (si.prot && !si.host) 808 if (si.prot && !si.host)
809 {
810 slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename);
811 /*TODO*/ /* start the timer so we don't recurse endlessly */
812 w.start (1);
764 vpn->send_connect_request (conf->id); 813 vpn->send_connect_request (conf->id);
814 }
765 else 815 else
766 { 816 {
817 slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx);
818
767 const sockinfo &dsi = forward_si (si); 819 const sockinfo &dsi = forward_si (si);
768 820
769 slow = slow || (dsi.prot & PROT_SLOW); 821 slow = slow || (dsi.prot & PROT_SLOW);
770 822
771 if (dsi.valid () && auth_rate_limiter.can (dsi)) 823 if (dsi.valid () && auth_rate_limiter.can (dsi))
… …
775 else 827 else
776 send_ping (dsi, 0); 828 send_ping (dsi, 0);
777 } 829 }
778 } 830 }
779 831
780 retry_int *= slow ? 8. : 0.7; 832 retry_int *= slow ? 8. : 0.9;
781 833
782 if (retry_int < conf->max_retry) 834 if (retry_int < conf->max_retry)
783 retry_cnt++; 835 retry_cnt++;
784 else 836 else
785 retry_int = conf->max_retry; 837 retry_int = conf->max_retry;
786 838
787 w.start (NOW + retry_int); 839 w.start (retry_int);
788 } 840 }
789} 841}
790 842
791void 843void
792connection::reset_connection () 844connection::reset_connection ()
… …
795 { 847 {
796 slog (L_INFO, _("%s(%s): connection lost"), 848 slog (L_INFO, _("%s(%s): connection lost"),
797 conf->nodename, (const char *)si); 849 conf->nodename, (const char *)si);
798 850
799 if (::conf.script_node_down) 851 if (::conf.script_node_down)
800 if (!run_script (run_script_cb (this, &connection::script_node_down), false)) 852 {
853 run_script_cb cb;
854 cb.set<connection, &connection::script_node_down> (this);
855 if (!run_script (cb, false))
801 slog (L_WARN, _("node-down command execution failed, continuing.")); 856 slog (L_WARN, _("node-down command execution failed, continuing."));
857 }
802 } 858 }
803 859
804 delete ictx; ictx = 0; 860 delete ictx; ictx = 0;
805 delete octx; octx = 0; 861 delete octx; octx = 0;
806#if ENABLE_DNS 862#if ENABLE_DNS
… …
824 send_reset (si); 880 send_reset (si);
825 881
826 reset_connection (); 882 reset_connection ();
827} 883}
828 884
829void 885inline void
830connection::rekey_cb (time_watcher &w) 886connection::rekey_cb (ev::timer &w, int revents)
831{ 887{
832 reset_connection (); 888 reset_connection ();
833 establish_connection (); 889 establish_connection ();
834} 890}
835 891
… …
851 if (oseqno > MAX_SEQNO) 907 if (oseqno > MAX_SEQNO)
852 rekey (); 908 rekey ();
853} 909}
854 910
855void 911void
912connection::post_inject_queue ()
913{
914 // force a connection every now and when when packets are sent (max 1/s)
915 if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
916 establish_connection.stop ();
917
918 establish_connection ();
919}
920
921void
856connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) 922connection::inject_data_packet (tap_packet *pkt)
857{ 923{
858 if (ictx && octx) 924 if (ictx && octx)
859 send_data_packet (pkt); 925 send_data_packet (pkt);
860 else 926 else
861 { 927 {
862 if (!broadcast)
863 data_queue.put (new tap_packet (*pkt)); 928 data_queue.put (new tap_packet (*pkt));
864 929 post_inject_queue ();
865 establish_connection ();
866 } 930 }
867} 931}
868 932
869void connection::inject_vpn_packet (vpn_packet *pkt, int tos) 933void connection::inject_vpn_packet (vpn_packet *pkt, int tos)
870{ 934{
871 if (ictx && octx) 935 if (ictx && octx)
872 send_vpn_packet (pkt, si, tos); 936 send_vpn_packet (pkt, si, tos);
873 else 937 else
874 { 938 {
875 vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); 939 vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
876 940 post_inject_queue ();
877 establish_connection ();
878 } 941 }
879} 942}
880 943
881void 944void
882connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) 945connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
883{ 946{
884 last_activity = NOW; 947 last_activity = ev_now ();
885 948
886 slog (L_NOISE, "<<%d received packet type %d from %d to %d", 949 slog (L_NOISE, "<<%d received packet type %d from %d to %d",
887 conf->id, pkt->typ (), pkt->src (), pkt->dst ()); 950 conf->id, pkt->typ (), pkt->src (), pkt->dst ());
951
952 if (connectmode == conf_node::C_DISABLED)
953 return;
888 954
889 switch (pkt->typ ()) 955 switch (pkt->typ ())
890 { 956 {
891 case vpn_packet::PT_PING: 957 case vpn_packet::PT_PING:
892 // we send pings instead of auth packets after some retries, 958 // we send pings instead of auth packets after some retries,
… …
1027 slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), 1093 slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1028 conf->nodename, (const char *)rsi, 1094 conf->nodename, (const char *)rsi,
1029 p->prot_major, p->prot_minor); 1095 p->prot_major, p->prot_minor);
1030 1096
1031 if (::conf.script_node_up) 1097 if (::conf.script_node_up)
1032 if (!run_script (run_script_cb (this, &connection::script_node_up), false)) 1098 {
1099 run_script_cb cb;
1100 cb.set<connection, &connection::script_node_up> (this);
1101 if (!run_script (cb, false))
1033 slog (L_WARN, _("node-up command execution failed, continuing.")); 1102 slog (L_WARN, _("node-up command execution failed, continuing."));
1103 }
1034 1104
1035 break; 1105 break;
1036 } 1106 }
1037 else 1107 else
1038 slog (L_ERR, _("%s(%s): sent and received challenge do not match"), 1108 slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
… …
1154 send_reset (rsi); 1224 send_reset (rsi);
1155 break; 1225 break;
1156 } 1226 }
1157} 1227}
1158 1228
1159void connection::keepalive_cb (time_watcher &w) 1229inline void
1230connection::keepalive_cb (ev::timer &w, int revents)
1160{ 1231{
1161 if (NOW >= last_activity + ::conf.keepalive + 30) 1232 if (ev_now () >= last_activity + ::conf.keepalive + 30)
1162 { 1233 {
1163 reset_connection (); 1234 reset_connection ();
1164 establish_connection (); 1235 establish_connection ();
1165 } 1236 }
1166 else if (NOW < last_activity + ::conf.keepalive) 1237 else if (ev_now () < last_activity + ::conf.keepalive)
1167 w.start (last_activity + ::conf.keepalive); 1238 w.start (last_activity + ::conf.keepalive - ev::now ());
1168 else if (conf->connectmode != conf_node::C_ONDEMAND 1239 else if (conf->connectmode != conf_node::C_ONDEMAND
1169 || THISNODE->connectmode != conf_node::C_ONDEMAND) 1240 || THISNODE->connectmode != conf_node::C_ONDEMAND)
1170 { 1241 {
1171 send_ping (si); 1242 send_ping (si);
1172 w.start (NOW + 5); 1243 w.start (5);
1173 } 1244 }
1174 else if (NOW < last_activity + ::conf.keepalive + 10) 1245 else if (ev_now () < last_activity + ::conf.keepalive + 10)
1175 // hold ondemand connections implicitly a few seconds longer 1246 // hold ondemand connections implicitly a few seconds longer
1176 // should delete octx, though, or something like that ;) 1247 // should delete octx, though, or something like that ;)
1177 w.start (last_activity + ::conf.keepalive + 10); 1248 w.start (last_activity + ::conf.keepalive + 10 - ev::now ());
1178 else 1249 else
1179 reset_connection (); 1250 reset_connection ();
1180} 1251}
1181 1252
1182void connection::send_connect_request (int id) 1253void connection::send_connect_request (int id)
… …
1209 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); 1280 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1210 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); 1281 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1211 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); 1282 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1212} 1283}
1213 1284
1285inline const char *
1214const char *connection::script_node_up () 1286connection::script_node_up ()
1215{ 1287{
1216 script_init_connect_env (); 1288 script_init_connect_env ();
1217 1289
1218 putenv ("STATE=up"); 1290 putenv ((char *)"STATE=up");
1219 1291
1220 char *filename; 1292 char *filename;
1221 asprintf (&filename, 1293 asprintf (&filename,
1222 "%s/%s", 1294 "%s/%s",
1223 confbase, 1295 confbase,
1224 ::conf.script_node_up ? ::conf.script_node_up : "node-up"); 1296 ::conf.script_node_up ? ::conf.script_node_up : "node-up");
1225 1297
1226 return filename; 1298 return filename;
1227} 1299}
1228 1300
1301inline const char *
1229const char *connection::script_node_down () 1302connection::script_node_down ()
1230{ 1303{
1231 script_init_connect_env (); 1304 script_init_connect_env ();
1232 1305
1233 putenv ("STATE=down"); 1306 putenv ((char *)"STATE=down");
1234 1307
1235 char *filename; 1308 char *filename;
1236 asprintf (&filename, 1309 asprintf (&filename,
1237 "%s/%s", 1310 "%s/%s",
1238 confbase, 1311 confbase,
… …
1240 1313
1241 return filename; 1314 return filename;
1242} 1315}
1243 1316
1244connection::connection (struct vpn *vpn, conf_node *conf) 1317connection::connection (struct vpn *vpn, conf_node *conf)
1245: vpn(vpn), conf(conf) 1318: vpn(vpn), conf(conf),
1246, rekey (this, &connection::rekey_cb)
1247, keepalive (this, &connection::keepalive_cb)
1248, establish_connection (this, &connection::establish_connection_cb)
1249#if ENABLE_DNS 1319#if ENABLE_DNS
1250, dns (0) 1320 dns (0),
1251#endif 1321#endif
1322 data_queue(conf->max_ttl, conf->max_queue),
1323 vpn_queue(conf->max_ttl, conf->max_queue)
1252{ 1324{
1325 rekey .set<connection, &connection::rekey_cb > (this);
1326 keepalive .set<connection, &connection::keepalive_cb > (this);
1327 establish_connection.set<connection, &connection::establish_connection_cb> (this);
1328
1329 last_establish_attempt = 0.;
1253 octx = ictx = 0; 1330 octx = ictx = 0;
1254 retry_cnt = 0;
1255 1331
1256 if (!conf->protocols) // make sure some protocol is enabled 1332 if (!conf->protocols) // make sure some protocol is enabled
1257 conf->protocols = PROT_UDPv4; 1333 conf->protocols = PROT_UDPv4;
1258 1334
1259 connectmode = conf_node::C_ALWAYS; // initial setting 1335 connectmode = conf->connectmode;
1336
1337 // queue a dummy packet to force an initial connection attempt
1338 if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
1339 vpn_queue.put (new net_packet);
1340
1260 reset_connection (); 1341 reset_connection ();
1261} 1342}
1262 1343
1263connection::~connection () 1344connection::~connection ()
1264{ 1345{

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