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/>.
31 // Create UDP listening goroutine.
32 // This function takes already listening UDP socket and a buffer where
33 // all UDP packet data will be saved, channel where information about
34 // remote address and number of written bytes are stored, and a channel
35 // used to tell that buffer is ready to be overwritten.
36 func ConnListenUDP(conn *net.UDPConn) (chan UDPPkt, chan struct{}) {
37 buf := make([]byte, MTU)
38 sink := make(chan UDPPkt)
39 sinkReady := make(chan struct{})
40 go func(conn *net.UDPConn) {
46 conn.SetReadDeadline(time.Now().Add(time.Second))
47 n, addr, err = conn.ReadFromUDP(buf)
49 // This is needed for ticking the timeouts counter outside
50 sink <- UDPPkt{nil, nil}
53 sink <- UDPPkt{addr, buf[:n]}
56 sinkReady <- struct{}{}
57 return sink, sinkReady