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/* SPDX-License-Identifier: GPL-2.0
*
* Copyright (C) 2017-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*/
package tun
import (
"git.zx2c4.com/wireguard-go/rwcancel"
"golang.org/x/sys/unix"
"net"
"os"
)
func CreateTUNFromFD(tunFd int) (TUNDevice, string, error) {
file := os.NewFile(uintptr(tunFd), "/dev/tun")
tun := &nativeTun{
tunFile: file,
fd: file.Fd(),
events: make(chan TUNEvent, 5),
errors: make(chan error, 5),
}
var err error
tun.rwcancel, err = rwcancel.NewRWCancel(tunFd)
if err != nil {
return nil, "", err
}
name, err := tun.Name()
if err != nil {
tun.rwcancel.Cancel()
return nil, "", err
}
tunIfindex, err := func() (int, error) {
iface, err := net.InterfaceByName(name)
if err != nil {
return -1, err
}
return iface.Index, nil
}()
if err != nil {
tun.tunFile.Close()
return nil, "", err
}
tun.routeSocket, err = unix.Socket(unix.AF_ROUTE, unix.SOCK_RAW, unix.AF_UNSPEC)
if err != nil {
tun.tunFile.Close()
return nil, "", err
}
go tun.routineRouteListener(tunIfindex)
return tun, name, nil
}
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