74 lines
1.2 KiB
Go
74 lines
1.2 KiB
Go
package tun
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import (
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wgtun "golang.zx2c4.com/wireguard/tun"
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"io"
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"log"
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"mpbl3p/proxy"
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"os"
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)
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type SourceSink struct {
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tun wgtun.Device
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mtu int
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}
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func NewTun(name string, mtu int) (t wgtun.Device, err error) {
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return wgtun.CreateTUN(name, mtu)
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}
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func NewFromFile(fd uintptr, mtu int) (ss *SourceSink, err error) {
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ss = new(SourceSink)
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file := os.NewFile(fd, "")
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ss.tun, err = wgtun.CreateTUNFromFile(file, mtu)
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if err != nil {
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return
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}
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ss.mtu = mtu
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return
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}
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func (t *SourceSink) Close() error {
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return t.tun.Close()
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}
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func (t *SourceSink) Source() (proxy.Packet, error) {
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buf := make([]byte, t.mtu)
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read, err := t.tun.Read(buf, 4)
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if err != nil {
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return nil, err
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}
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if read == 0 {
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return nil, io.EOF
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}
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return proxy.SimplePacket(buf[4:read]), nil
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}
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var good, bad float64
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func (t *SourceSink) Sink(packet proxy.Packet) error {
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// make space for tun header
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content := make([]byte, len(packet.Contents())+4)
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copy(content[4:], packet.Contents())
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_, err := t.tun.Write(content, 4)
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if err != nil {
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switch err.(type) {
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case *os.PathError:
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bad += 1
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log.Printf("packet loss: %f%%\n", bad*100/(good+bad))
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return nil
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default:
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return err
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}
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}
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good += 1
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return nil
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}
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