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 | |
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20 | Additional permission under GNU GPL version 3 section 7 |
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21 | |
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22 | If you modify this Program, or any covered work, by linking or |
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23 | combining it with the OpenSSL project's OpenSSL library (or a modified |
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24 | version of that library), containing parts covered by the terms of the |
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25 | OpenSSL or SSLeay licenses, the licensors of this Program grant you |
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26 | additional permission to convey the resulting work. Corresponding |
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27 | Source for a non-source form of such a combination shall include the |
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28 | source code for the parts of OpenSSL used as well as that of the |
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29 | covered work. |
20 | */ |
30 | */ |
21 | |
31 | |
22 | #include "config.h" |
32 | #include "config.h" |
23 | |
33 | |
24 | #include <list> |
34 | #include <list> |
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35 | #include <queue> |
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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" |
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62 | |
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63 | ////////////////////////////////////////////////////////////////////////////// |
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64 | |
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65 | static std::queue< std::pair<run_script_cb *, const char *> > rs_queue; |
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66 | static ev::child rs_child_ev; |
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67 | |
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68 | void // c++ requires external linkage here, apparently :( |
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69 | rs_child_cb (ev::child &w, int revents) |
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70 | { |
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71 | w.stop (); |
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72 | |
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73 | if (rs_queue.empty ()) |
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74 | return; |
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75 | |
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76 | pid_t pid = run_script (*rs_queue.front ().first, false); |
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77 | if (pid) |
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78 | { |
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79 | w.set (pid); |
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80 | w.start (); |
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81 | } |
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82 | else |
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83 | slog (L_WARN, rs_queue.front ().second); |
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84 | |
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85 | delete rs_queue.front ().first; |
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86 | rs_queue.pop (); |
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87 | } |
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88 | |
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89 | // despite the fancy name, this is quite a hack |
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90 | static void |
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91 | run_script_queued (run_script_cb *cb, const char *warnmsg) |
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92 | { |
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93 | rs_queue.push (std::make_pair (cb, warnmsg)); |
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94 | |
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95 | if (!rs_child_ev.is_active ()) |
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96 | { |
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97 | rs_child_ev.set<rs_child_cb> (); |
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98 | rs_child_ev (); |
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99 | } |
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100 | } |
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101 | |
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102 | ////////////////////////////////////////////////////////////////////////////// |
50 | |
103 | |
51 | struct crypto_ctx |
104 | struct crypto_ctx |
52 | { |
105 | { |
53 | EVP_CIPHER_CTX cctx; |
106 | EVP_CIPHER_CTX cctx; |
54 | HMAC_CTX hctx; |
107 | HMAC_CTX hctx; |
… | |
… | |
658 | void |
711 | void |
659 | connection::reset_si () |
712 | connection::reset_si () |
660 | { |
713 | { |
661 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
714 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
662 | |
715 | |
663 | // mask out protocols we cannot establish |
716 | // mask out endpoints we can't connect to |
664 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
717 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
665 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
718 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
666 | if (!conf->dns_port) protocol &= ~PROT_DNSv4; |
719 | if (!conf->dns_port) protocol &= ~PROT_DNSv4; |
667 | |
720 | |
668 | if (protocol |
721 | if (protocol |
… | |
… | |
689 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"), |
742 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"), |
690 | conf->nodename, r->conf->nodename, (const char *)r->si); |
743 | conf->nodename, r->conf->nodename, (const char *)r->si); |
691 | return r->si; |
744 | return r->si; |
692 | } |
745 | } |
693 | else |
746 | else |
694 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
747 | slog (L_DEBUG, _("%s: node unreachable, no common protocol, no router"), |
695 | conf->nodename); |
748 | conf->nodename); |
696 | } |
749 | } |
697 | |
750 | |
698 | return si; |
751 | return si; |
699 | } |
752 | } |
… | |
… | |
792 | if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ()) |
845 | if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ()) |
793 | { |
846 | { |
794 | reset_connection (); |
847 | reset_connection (); |
795 | return; |
848 | return; |
796 | } |
849 | } |
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850 | |
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851 | last_establish_attempt = ev_now (); |
797 | |
852 | |
798 | ev::tstamp retry_int = ev::tstamp (retry_cnt & 3 |
853 | ev::tstamp retry_int = ev::tstamp (retry_cnt & 3 |
799 | ? (retry_cnt & 3) + 1 |
854 | ? (retry_cnt & 3) + 1 |
800 | : 1 << (retry_cnt >> 2)); |
855 | : 1 << (retry_cnt >> 2)); |
801 | |
856 | |
… | |
… | |
825 | else |
880 | else |
826 | send_ping (dsi, 0); |
881 | send_ping (dsi, 0); |
827 | } |
882 | } |
828 | } |
883 | } |
829 | |
884 | |
830 | retry_int *= slow ? 8. : 0.7; |
885 | retry_int *= slow ? 8. : 0.9; |
831 | |
886 | |
832 | if (retry_int < conf->max_retry) |
887 | if (retry_int < conf->max_retry) |
833 | retry_cnt++; |
888 | retry_cnt++; |
834 | else |
889 | else |
835 | retry_int = conf->max_retry; |
890 | retry_int = conf->max_retry; |
… | |
… | |
846 | slog (L_INFO, _("%s(%s): connection lost"), |
901 | slog (L_INFO, _("%s(%s): connection lost"), |
847 | conf->nodename, (const char *)si); |
902 | conf->nodename, (const char *)si); |
848 | |
903 | |
849 | if (::conf.script_node_down) |
904 | if (::conf.script_node_down) |
850 | { |
905 | { |
851 | run_script_cb cb; |
906 | run_script_cb *cb = new run_script_cb; |
852 | cb.set<connection, &connection::script_node_down> (this); |
907 | cb->set<connection, &connection::script_node_down> (this); |
853 | if (!run_script (cb, false)) |
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854 | slog (L_WARN, _("node-down command execution failed, continuing.")); |
908 | run_script_queued (cb, _("node-down command execution failed, continuing.")); |
855 | } |
909 | } |
856 | } |
910 | } |
857 | |
911 | |
858 | delete ictx; ictx = 0; |
912 | delete ictx; ictx = 0; |
859 | delete octx; octx = 0; |
913 | delete octx; octx = 0; |
… | |
… | |
905 | if (oseqno > MAX_SEQNO) |
959 | if (oseqno > MAX_SEQNO) |
906 | rekey (); |
960 | rekey (); |
907 | } |
961 | } |
908 | |
962 | |
909 | void |
963 | void |
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964 | connection::post_inject_queue () |
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965 | { |
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966 | // force a connection every now and when when packets are sent (max 1/s) |
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967 | if (ev_now () - last_establish_attempt >= 0.95) // arbitrary |
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968 | establish_connection.stop (); |
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969 | |
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970 | establish_connection (); |
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971 | } |
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972 | |
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973 | void |
910 | connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) |
974 | connection::inject_data_packet (tap_packet *pkt) |
911 | { |
975 | { |
912 | if (ictx && octx) |
976 | if (ictx && octx) |
913 | send_data_packet (pkt); |
977 | send_data_packet (pkt); |
914 | else |
978 | else |
915 | { |
979 | { |
916 | if (!broadcast) |
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917 | data_queue.put (new tap_packet (*pkt)); |
980 | data_queue.put (new tap_packet (*pkt)); |
918 | |
981 | post_inject_queue (); |
919 | establish_connection (); |
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920 | } |
982 | } |
921 | } |
983 | } |
922 | |
984 | |
923 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
985 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
924 | { |
986 | { |
925 | if (ictx && octx) |
987 | if (ictx && octx) |
926 | send_vpn_packet (pkt, si, tos); |
988 | send_vpn_packet (pkt, si, tos); |
927 | else |
989 | else |
928 | { |
990 | { |
929 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
991 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
930 | |
992 | post_inject_queue (); |
931 | establish_connection (); |
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932 | } |
993 | } |
933 | } |
994 | } |
934 | |
995 | |
935 | void |
996 | void |
936 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
997 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
… | |
… | |
1085 | conf->nodename, (const char *)rsi, |
1146 | conf->nodename, (const char *)rsi, |
1086 | p->prot_major, p->prot_minor); |
1147 | p->prot_major, p->prot_minor); |
1087 | |
1148 | |
1088 | if (::conf.script_node_up) |
1149 | if (::conf.script_node_up) |
1089 | { |
1150 | { |
1090 | run_script_cb cb; |
1151 | run_script_cb *cb = new run_script_cb; |
1091 | cb.set<connection, &connection::script_node_up> (this); |
1152 | cb->set<connection, &connection::script_node_up> (this); |
1092 | if (!run_script (cb, false)) |
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1093 | slog (L_WARN, _("node-up command execution failed, continuing.")); |
1153 | run_script_queued (cb, _("node-up command execution failed, continuing.")); |
1094 | } |
1154 | } |
1095 | |
1155 | |
1096 | break; |
1156 | break; |
1097 | } |
1157 | } |
1098 | else |
1158 | else |
… | |
… | |
1308 | connection::connection (struct vpn *vpn, conf_node *conf) |
1368 | connection::connection (struct vpn *vpn, conf_node *conf) |
1309 | : vpn(vpn), conf(conf), |
1369 | : vpn(vpn), conf(conf), |
1310 | #if ENABLE_DNS |
1370 | #if ENABLE_DNS |
1311 | dns (0), |
1371 | dns (0), |
1312 | #endif |
1372 | #endif |
1313 | data_queue(conf->max_ttl, conf->max_queue), |
1373 | data_queue(conf->max_ttl, conf->max_queue + 1), |
1314 | vpn_queue(conf->max_ttl, conf->max_queue) |
1374 | vpn_queue(conf->max_ttl, conf->max_queue + 1) |
1315 | { |
1375 | { |
1316 | rekey .set<connection, &connection::rekey_cb > (this); |
1376 | rekey .set<connection, &connection::rekey_cb > (this); |
1317 | keepalive .set<connection, &connection::keepalive_cb > (this); |
1377 | keepalive .set<connection, &connection::keepalive_cb > (this); |
1318 | establish_connection.set<connection, &connection::establish_connection_cb> (this); |
1378 | establish_connection.set<connection, &connection::establish_connection_cb> (this); |
1319 | |
1379 | |
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1380 | last_establish_attempt = 0.; |
1320 | octx = ictx = 0; |
1381 | octx = ictx = 0; |
1321 | retry_cnt = 0; |
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1322 | |
1382 | |
1323 | if (!conf->protocols) // make sure some protocol is enabled |
1383 | if (!conf->protocols) // make sure some protocol is enabled |
1324 | conf->protocols = PROT_UDPv4; |
1384 | conf->protocols = PROT_UDPv4; |
1325 | |
1385 | |
1326 | connectmode = conf->connectmode; |
1386 | connectmode = conf->connectmode; |
1327 | |
1387 | |
1328 | // queue a dummy packet to force an initial connection attempt |
1388 | // queue a dummy packet to force an initial connection attempt |
1329 | if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) |
1389 | if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) |
1330 | { |
1390 | vpn_queue.put (new net_packet); |
1331 | net_packet *p = new net_packet; |
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1332 | p->len = 0; |
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1333 | vpn_queue.put (p); |
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1334 | } |
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1335 | |
1391 | |
1336 | reset_connection (); |
1392 | reset_connection (); |
1337 | } |
1393 | } |
1338 | |
1394 | |
1339 | connection::~connection () |
1395 | connection::~connection () |