tailscale/net/tstun/fake.go

55 lines
1.1 KiB
Go

// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tstun
import (
"io"
"os"
"golang.zx2c4.com/wireguard/tun"
)
type fakeTUN struct {
evchan chan tun.Event
closechan chan struct{}
}
// NewFake returns a tun.Device that does nothing.
func NewFake() tun.Device {
return &fakeTUN{
evchan: make(chan tun.Event),
closechan: make(chan struct{}),
}
}
func (t *fakeTUN) File() *os.File {
panic("fakeTUN.File() called, which makes no sense")
}
func (t *fakeTUN) Close() error {
close(t.closechan)
close(t.evchan)
return nil
}
func (t *fakeTUN) Read(out []byte, offset int) (int, error) {
<-t.closechan
return 0, io.EOF
}
func (t *fakeTUN) Write(b []byte, n int) (int, error) {
select {
case <-t.closechan:
return 0, ErrClosed
default:
}
return len(b), nil
}
func (t *fakeTUN) Flush() error { return nil }
func (t *fakeTUN) MTU() (int, error) { return 1500, nil }
func (t *fakeTUN) Name() (string, error) { return "FakeTUN", nil }
func (t *fakeTUN) Events() chan tun.Event { return t.evchan }