2 GoVPN -- simple secure free software virtual private network daemon
3 Copyright (C) 2014-2015 Sergey Matveev <stargrave@stargrave.org>
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
19 // Simple secure, DPI/censorship-resistant free software VPN daemon.
35 bindAddr = flag.String("bind", "[::]:1194", "Bind to address")
36 proto = flag.String("proto", "udp", "Protocol to use: udp, tcp or all")
37 peersPath = flag.String("peers", "peers", "Path to peers keys directory")
38 stats = flag.String("stats", "", "Enable stats retrieving on host:port")
39 proxy = flag.String("proxy", "", "Enable HTTP proxy on host:port")
40 mtu = flag.Int("mtu", 1452, "MTU for outgoing packets")
41 egdPath = flag.String("egd", "", "Optional path to EGD socket")
46 timeout := time.Second * time.Duration(govpn.TimeoutDefault)
47 log.SetFlags(log.Ldate | log.Lmicroseconds | log.Lshortfile)
48 log.Println(govpn.VersionGet())
51 govpn.PeersInit(*peersPath)
52 knownPeers = govpn.KnownPeers(make(map[string]**govpn.Peer))
55 log.Println("Using", *egdPath, "EGD")
56 govpn.EGDInit(*egdPath)
68 log.Fatalln("Unknown protocol specified")
71 termSignal := make(chan os.Signal, 1)
72 signal.Notify(termSignal, os.Interrupt, os.Kill)
74 hsHeartbeat := time.Tick(timeout)
75 go func() { <-hsHeartbeat }()
77 log.Println("Max MTU on TAP interface:", govpn.TAPMaxMTU())
79 log.Println("Stats are going to listen on", *stats)
80 statsPort, err := net.Listen("tcp", *stats)
82 log.Fatalln("Can not listen on stats port:", err)
84 go govpn.StatsProcessor(statsPort, &knownPeers)
89 log.Println("Server started")
91 var needsDeletion bool
100 for addr, hs := range handshakes {
101 if hs.LastPing.Add(timeout).Before(now) {
102 log.Println("Deleting handshake state", addr)
104 delete(handshakes, addr)
110 for addr, ps := range peers {
112 needsDeletion = ps.peer.LastPing.Add(timeout).Before(now)
113 ps.peer.BusyR.Unlock()
115 log.Println("Deleting peer", ps.peer)
117 delete(knownPeers, addr)
118 delete(peersById, *ps.peer.Id)
119 downPath := path.Join(
124 go govpn.ScriptCall(downPath, ps.tap.Name)
125 ps.terminator <- struct{}{}
130 peersByIdLock.Unlock()