mirror of
https://git.zx2c4.com/wireguard-go
synced 2024-11-15 01:05:15 +01:00
366cbd11a4
The new sysconn function of Go 1.12 makes this possible:
package main
import "log"
import "os"
import "unsafe"
import "time"
import "syscall"
import "sync"
import "golang.org/x/sys/unix"
func main() {
fd, err := os.OpenFile("/dev/net/tun", os.O_RDWR, 0)
if err != nil {
log.Fatal(err)
}
var ifr [unix.IFNAMSIZ + 64]byte
copy(ifr[:], []byte("cheese"))
*(*uint16)(unsafe.Pointer(&ifr[unix.IFNAMSIZ])) = unix.IFF_TUN
var errno syscall.Errno
s, _ := fd.SyscallConn()
s.Control(func(fd uintptr) {
_, _, errno = unix.Syscall(
unix.SYS_IOCTL,
fd,
uintptr(unix.TUNSETIFF),
uintptr(unsafe.Pointer(&ifr[0])),
)
})
if errno != 0 {
log.Fatal(errno)
}
b := [4]byte{}
wait := sync.WaitGroup{}
wait.Add(1)
go func() {
_, err := fd.Read(b[:])
log.Print("Read errored: ", err)
wait.Done()
}()
time.Sleep(time.Second)
log.Print("Closing")
err = fd.Close()
if err != nil {
log.Print("Close errored: " , err)
}
wait.Wait()
log.Print("Exiting")
}
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())
|
|
}
|
|
}
|