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tailscale/net/tstun/fake.go

59 lines
1.3 KiB
Go

// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package tstun
import (
"io"
"os"
"github.com/tailscale/wireguard-go/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, sizes []int, 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 1, nil
}
// FakeTUNName is the name of the fake TUN device.
const FakeTUNName = "FakeTUN"
func (t *fakeTUN) Flush() error { return nil }
func (t *fakeTUN) MTU() (int, error) { return 1500, nil }
func (t *fakeTUN) Name() (string, error) { return FakeTUNName, nil }
func (t *fakeTUN) Events() <-chan tun.Event { return t.evchan }
func (t *fakeTUN) BatchSize() int { return 1 }
func (t *fakeTUN) IsFakeTun() bool { return true }