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