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