2 GoVPN -- simple secure free software virtual private network daemon
3 Copyright (C) 2014-2016 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/>.
30 func startUDP(timeouted, rehandshaking, termination chan struct{}) {
31 remote, err := net.ResolveUDPAddr("udp", *remoteAddr)
33 log.Fatalln("Can not resolve remote address:", err)
35 conn, err := net.DialUDP("udp", nil, remote)
37 log.Fatalln("Can not listen on UDP:", err)
39 log.Println("Connected to UDP:" + *remoteAddr)
41 hs := govpn.HandshakeStart(*remoteAddr, conn, conf)
42 buf := make([]byte, *mtu*2)
46 var terminator chan struct{}
55 conn.SetReadDeadline(time.Now().Add(time.Second))
56 n, err = conn.Read(buf)
57 if timeouts == timeout {
58 log.Println("Timeouted")
59 timeouted <- struct{}{}
67 if peer.PktProcess(buf[:n], tap, true) {
70 log.Println("Unauthenticated packet")
73 if atomic.LoadInt64(&peer.BytesIn)+atomic.LoadInt64(&peer.BytesOut) > govpn.MaxBytesPerKey {
74 log.Println("Need rehandshake")
75 rehandshaking <- struct{}{}
80 if idsCache.Find(buf[:n]) == nil {
81 log.Println("Invalid identity in handshake packet")
85 peer = hs.Client(buf[:n])
89 log.Println("Handshake completed")
90 knownPeers = govpn.KnownPeers(map[string]**govpn.Peer{*remoteAddr: &peer})
92 go govpn.ScriptCall(*upPath, *ifaceName)
96 terminator = make(chan struct{})
98 heartbeat := time.NewTicker(peer.Timeout)
107 case data = <-tap.Sink:
108 peer.EthProcess(data)
115 if terminator != nil {
116 terminator <- struct{}{}