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42 lines
1.2 KiB
Go
42 lines
1.2 KiB
Go
/* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2017-2019 WireGuard LLC. All Rights Reserved.
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*/
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package tun
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import (
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"fmt"
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"os"
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)
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type TUNEvent int
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const (
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TUNEventUp = 1 << iota
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TUNEventDown
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TUNEventMTUUpdate
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)
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type TUNDevice interface {
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File() *os.File // returns the file descriptor of the device
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Read([]byte, int) (int, error) // read a packet from the device (without any additional headers)
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Write([]byte, int) (int, error) // writes a packet to the device (without any additional headers)
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MTU() (int, error) // returns the MTU of the device
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Name() (string, error) // fetches and returns the current name
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Events() chan TUNEvent // returns a constant channel of events related to the device
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Close() error // stops the device and closes the event channel
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}
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func (tun *NativeTun) operateOnFd(fn func(fd uintptr)) {
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sysconn, err := tun.tunFile.SyscallConn()
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if err != nil {
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tun.errors <- fmt.Errorf("unable to find sysconn for tunfile: %s", err.Error())
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return
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}
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err = sysconn.Control(fn)
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if err != nil {
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tun.errors <- fmt.Errorf("unable to control sysconn for tunfile: %s", err.Error())
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}
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}
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