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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
*/
package device
import (
"errors"
"os"
"golang.zx2c4.com/wireguard/tun"
)
// newDummyTUN creates a dummy TUN device with the specified name.
func newDummyTUN(name string) tun.Device {
return &dummyTUN{
name: name,
packets: make(chan []byte, 100),
events: make(chan tun.Event, 10),
}
}
// A dummyTUN is a tun.Device which is used in unit tests.
type dummyTUN struct {
name string
mtu int
packets chan []byte
events chan tun.Event
}
func (d *dummyTUN) Events() chan tun.Event { return d.events }
func (*dummyTUN) File() *os.File { return nil }
func (*dummyTUN) Flush() error { return nil }
func (d *dummyTUN) MTU() (int, error) { return d.mtu, nil }
func (d *dummyTUN) Name() (string, error) { return d.name, nil }
func (d *dummyTUN) Close() error {
close(d.events)
close(d.packets)
return nil
}
func (d *dummyTUN) Read(b []byte, offset int) (int, error) {
buf, ok := <-d.packets
if !ok {
return 0, errors.New("device closed")
}
copy(b[offset:], buf)
return len(buf), nil
}
func (d *dummyTUN) Write(b []byte, offset int) (int, error) {
d.packets <- b[offset:]
return len(b), nil
}
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