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tunio.go
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tunio.go
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package main
import (
"errors"
"io"
"os/exec"
"github.com/polevpn/elog"
"github.com/polevpn/water"
)
type TunIO struct {
ifce *water.Interface
wch chan []byte
mtu int
handler *PacketDispatcher
closed bool
}
func NewTunIO(size int, handler *PacketDispatcher) (*TunIO, error) {
config := water.Config{
DeviceType: water.TUN,
}
ifce, err := water.New(config)
if err != nil {
return nil, err
}
return &TunIO{
ifce: ifce,
wch: make(chan []byte, size),
mtu: 1500,
handler: handler,
closed: false,
}, nil
}
// ip addr add dev tun0 local 10.8.0.1 peer 10.8.0.1
// ip route add 10.8.0.0/24 via 10.8.0.1
func (t *TunIO) SetIPAddress(ip1 string) error {
out, err := exec.Command("bash", "-c", "ip addr add dev "+t.ifce.Name()+" local "+ip1+" peer "+ip1).CombinedOutput()
if err != nil {
return errors.New(err.Error() + "," + string(out))
}
return nil
}
func (t *TunIO) Enanble() error {
out, err := exec.Command("bash", "-c", "ip link set "+t.ifce.Name()+" up").CombinedOutput()
if err != nil {
return errors.New(err.Error() + "," + string(out))
}
return nil
}
func (t *TunIO) AddRoute(cidr string, gw string) error {
out, err := exec.Command("bash", "-c", "ip route add "+cidr+" via "+gw).CombinedOutput()
if err != nil {
return errors.New(err.Error() + "," + string(out))
}
return err
}
func (t *TunIO) Close() error {
if t.closed {
return nil
}
if t.wch != nil {
t.wch <- nil
close(t.wch)
}
t.closed = true
return t.ifce.Close()
}
func (t *TunIO) read() {
defer func() {
t.Close()
}()
defer PanicHandlerExit()
for {
pkt := make([]byte, t.mtu)
n, err := t.ifce.Read(pkt)
if err != nil {
elog.Error("read pkg from tun fail", err)
return
}
pkt = pkt[:n]
t.handler.Dispatch(pkt)
}
}
func (t *TunIO) write() {
defer PanicHandlerExit()
for {
pkt, ok := <-t.wch
if !ok {
elog.Error("get pkt from write channel fail,maybe channel closed")
return
}
if pkt == nil {
elog.Info("exit write process")
return
}
_, err := t.ifce.Write(pkt)
if err != nil {
if err == io.EOF {
elog.Info("tun may be closed")
} else {
elog.Error("tun write error", err)
}
return
}
}
}
func (t *TunIO) Enqueue(pkt []byte) error {
if t.wch == nil {
return errors.New("write channel is nil")
}
t.wch <- pkt
return nil
}
func (t *TunIO) StartProcess() {
go t.read()
go t.write()
}