2 GoVPN -- simple secure free software virtual private network daemon
3 Copyright (C) 2014-2017 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/>.
25 // TAP is a TUN or a TAP interface.
33 taps = make(map[string]*TAP)
36 // NewTAP creates a new TUN/TAP virtual interface
37 func NewTAP(ifaceName string, mtu int) (*TAP, error) {
38 tapRaw, err := newTAPer(ifaceName)
45 Sink: make(chan []byte),
51 buf0 := make([]byte, mtu)
52 buf1 := make([]byte, mtu)
61 n, err = tap.dev.Read(buf)
63 panic("Reading TUN/TAP:" + err.Error())
71 func (t *TAP) Write(data []byte) (n int, err error) {
72 return t.dev.Write(data)
75 // TAPListen opens an existing TAP (creates if none exists)
76 func TAPListen(ifaceName string, mtu int) (*TAP, error) {
77 tap, exists := taps[ifaceName]
81 tap, err := NewTAP(ifaceName, mtu)