57 lines
1.2 KiB
Go
57 lines
1.2 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"
|
|
|
|
"github.com/tailscale/wireguard-go/tun"
|
|
)
|
|
|
|
type fakeTUN struct {
|
|
evchan chan tun.Event
|
|
closechan chan struct{}
|
|
}
|
|
|
|
// NewFakeTUN returns a fake TUN device that does not depend on the
|
|
// operating system or any special permissions.
|
|
// It primarily exists for testing.
|
|
func NewFakeTUN() 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 }
|