2019-01-02 01:55:51 +01:00
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/* SPDX-License-Identifier: MIT
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2018-05-03 15:04:00 +02:00
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*
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2019-01-02 01:55:51 +01:00
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* Copyright (C) 2017-2019 WireGuard LLC. All Rights Reserved.
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2018-05-03 15:04:00 +02:00
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*/
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2018-05-23 02:10:54 +02:00
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package tun
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2017-06-04 21:48:15 +02:00
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2017-07-20 15:06:24 +02:00
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/* Implementation of the TUN device interface for linux
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*/
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2017-06-04 21:48:15 +02:00
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import (
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2018-05-05 02:48:21 +02:00
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"bytes"
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2017-06-04 21:48:15 +02:00
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"errors"
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2017-08-17 00:25:39 +02:00
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"fmt"
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2017-06-04 21:48:15 +02:00
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"os"
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2018-05-21 03:31:44 +02:00
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"sync"
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2019-03-07 01:51:41 +01:00
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"syscall"
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2017-11-29 18:46:31 +01:00
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"time"
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2017-06-04 21:48:15 +02:00
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"unsafe"
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2019-05-14 09:09:52 +02:00
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"golang.org/x/net/ipv6"
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"golang.org/x/sys/unix"
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"golang.zx2c4.com/wireguard/rwcancel"
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2017-06-04 21:48:15 +02:00
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)
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2017-08-17 00:25:39 +02:00
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const (
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2018-02-13 16:43:07 +01:00
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cloneDevicePath = "/dev/net/tun"
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ifReqSize = unix.IFNAMSIZ + 64
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2017-08-17 00:25:39 +02:00
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)
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2017-06-04 21:48:15 +02:00
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2019-03-01 00:05:57 +01:00
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type NativeTun struct {
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2018-10-17 21:26:53 +02:00
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tunFile *os.File
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2019-06-10 23:33:40 +02:00
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index int32 // if index
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errors chan error // async error handling
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events chan Event // device related events
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2019-10-21 22:52:26 +02:00
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nopi bool // the device was passed IFF_NO_PI
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2018-05-21 03:31:44 +02:00
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netlinkSock int
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netlinkCancel *rwcancel.RWCancel
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hackListenerClosed sync.Mutex
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2018-05-14 03:43:56 +02:00
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statusListenersShutdown chan struct{}
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2020-02-28 18:10:16 +01:00
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nameOnce sync.Once // guards calling initNameCache, which sets following fields
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nameCache string // name of interface
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nameErr error
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2017-08-17 00:25:39 +02:00
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}
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2019-03-01 00:05:57 +01:00
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func (tun *NativeTun) File() *os.File {
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2018-10-17 21:26:53 +02:00
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return tun.tunFile
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2017-11-14 18:26:28 +01:00
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}
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2019-03-01 00:05:57 +01:00
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func (tun *NativeTun) routineHackListener() {
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2018-05-21 03:31:44 +02:00
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defer tun.hackListenerClosed.Unlock()
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2017-11-29 21:12:09 +01:00
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/* This is needed for the detection to work across network namespaces
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2017-11-29 18:46:31 +01:00
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* If you are reading this and know a better method, please get in touch.
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*/
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for {
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2019-03-07 01:51:41 +01:00
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sysconn, err := tun.tunFile.SyscallConn()
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if err != nil {
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return
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}
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err2 := sysconn.Control(func(fd uintptr) {
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_, err = unix.Write(int(fd), nil)
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})
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if err2 != nil {
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return
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}
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2017-11-29 18:46:31 +01:00
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switch err {
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case unix.EINVAL:
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2019-11-06 09:28:02 +01:00
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// If the tunnel is up, it reports that write() is
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// allowed but we provided invalid data.
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2019-06-10 23:33:40 +02:00
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tun.events <- EventUp
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2017-11-29 18:46:31 +01:00
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case unix.EIO:
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2019-11-06 09:28:02 +01:00
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// If the tunnel is down, it reports that no I/O
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// is possible, without checking our provided data.
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2019-06-10 23:33:40 +02:00
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tun.events <- EventDown
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2017-11-29 18:46:31 +01:00
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default:
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2018-05-14 02:14:33 +02:00
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return
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}
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select {
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2018-05-20 04:03:11 +02:00
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case <-time.After(time.Second):
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2019-11-06 09:28:02 +01:00
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// nothing
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2018-05-14 03:43:56 +02:00
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case <-tun.statusListenersShutdown:
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2018-05-14 02:14:33 +02:00
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return
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2017-11-29 18:46:31 +01:00
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}
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}
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}
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2018-05-14 02:14:33 +02:00
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func createNetlinkSocket() (int, error) {
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2018-04-27 02:23:48 +02:00
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sock, err := unix.Socket(unix.AF_NETLINK, unix.SOCK_RAW, unix.NETLINK_ROUTE)
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2018-02-13 16:43:07 +01:00
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if err != nil {
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2018-05-14 02:14:33 +02:00
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return -1, err
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2017-08-17 00:25:39 +02:00
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}
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2018-04-27 02:23:48 +02:00
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saddr := &unix.SockaddrNetlink{
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Family: unix.AF_NETLINK,
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2020-03-04 17:21:54 +01:00
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Groups: unix.RTMGRP_LINK | unix.RTMGRP_IPV4_IFADDR | unix.RTMGRP_IPV6_IFADDR,
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2018-04-27 02:23:48 +02:00
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}
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err = unix.Bind(sock, saddr)
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if err != nil {
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2018-05-14 02:14:33 +02:00
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return -1, err
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2018-04-27 02:23:48 +02:00
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}
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2018-05-14 02:14:33 +02:00
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return sock, nil
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}
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2018-04-27 02:23:48 +02:00
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2019-03-01 00:05:57 +01:00
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func (tun *NativeTun) routineNetlinkListener() {
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2018-05-20 06:38:39 +02:00
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defer func() {
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unix.Close(tun.netlinkSock)
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2018-05-21 03:31:44 +02:00
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tun.hackListenerClosed.Lock()
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2018-05-20 06:38:39 +02:00
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close(tun.events)
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}()
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2018-05-14 14:08:03 +02:00
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2017-08-17 00:25:39 +02:00
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for msg := make([]byte, 1<<16); ; {
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2018-05-14 14:08:03 +02:00
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var err error
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var msgn int
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for {
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msgn, _, _, _, err = unix.Recvmsg(tun.netlinkSock, msg[:], nil, 0)
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2018-05-24 15:29:16 +02:00
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if err == nil || !rwcancel.RetryAfterError(err) {
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2018-05-14 14:08:03 +02:00
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break
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}
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if !tun.netlinkCancel.ReadyRead() {
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tun.errors <- fmt.Errorf("netlink socket closed: %s", err.Error())
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return
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}
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}
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2017-08-17 00:25:39 +02:00
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if err != nil {
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2018-05-14 02:14:33 +02:00
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tun.errors <- fmt.Errorf("failed to receive netlink message: %s", err.Error())
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2017-08-17 00:25:39 +02:00
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return
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}
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2018-05-14 03:43:56 +02:00
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select {
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case <-tun.statusListenersShutdown:
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return
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default:
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}
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2019-11-06 09:28:02 +01:00
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wasEverUp := false
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2017-08-17 00:25:39 +02:00
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for remain := msg[:msgn]; len(remain) >= unix.SizeofNlMsghdr; {
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hdr := *(*unix.NlMsghdr)(unsafe.Pointer(&remain[0]))
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if int(hdr.Len) > len(remain) {
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break
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}
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switch hdr.Type {
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case unix.NLMSG_DONE:
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remain = []byte{}
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case unix.RTM_NEWLINK:
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info := *(*unix.IfInfomsg)(unsafe.Pointer(&remain[unix.SizeofNlMsghdr]))
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2017-08-22 14:57:32 +02:00
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remain = remain[hdr.Len:]
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2017-08-17 00:25:39 +02:00
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2017-08-17 12:58:18 +02:00
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if info.Index != tun.index {
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// not our interface
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continue
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}
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2017-08-17 00:25:39 +02:00
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if info.Flags&unix.IFF_RUNNING != 0 {
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2019-06-10 23:33:40 +02:00
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tun.events <- EventUp
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2019-11-06 09:28:02 +01:00
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wasEverUp = true
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2017-08-17 00:25:39 +02:00
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}
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if info.Flags&unix.IFF_RUNNING == 0 {
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2019-11-06 09:28:02 +01:00
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// Don't emit EventDown before we've ever emitted EventUp.
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// This avoids a startup race with HackListener, which
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// might detect Up before we have finished reporting Down.
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if wasEverUp {
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tun.events <- EventDown
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}
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2017-08-17 00:25:39 +02:00
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}
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2019-06-10 23:33:40 +02:00
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tun.events <- EventMTUUpdate
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2017-08-17 00:25:39 +02:00
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default:
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remain = remain[hdr.Len:]
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}
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}
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}
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2017-06-04 21:48:15 +02:00
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}
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2019-02-27 01:06:43 +01:00
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func getIFIndex(name string) (int32, error) {
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fd, err := unix.Socket(
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2017-08-17 00:25:39 +02:00
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unix.AF_INET,
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unix.SOCK_DGRAM,
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0,
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)
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if err != nil {
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return 0, err
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}
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defer unix.Close(fd)
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2018-02-13 16:43:07 +01:00
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var ifr [ifReqSize]byte
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2017-08-17 00:25:39 +02:00
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copy(ifr[:], name)
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_, _, errno := unix.Syscall(
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unix.SYS_IOCTL,
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uintptr(fd),
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uintptr(unix.SIOCGIFINDEX),
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uintptr(unsafe.Pointer(&ifr[0])),
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)
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if errno != 0 {
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return 0, errno
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}
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2018-05-23 02:10:54 +02:00
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return *(*int32)(unsafe.Pointer(&ifr[unix.IFNAMSIZ])), nil
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2017-08-17 00:25:39 +02:00
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}
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2019-03-01 00:05:57 +01:00
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func (tun *NativeTun) setMTU(n int) error {
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2020-02-28 18:10:16 +01:00
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name, err := tun.Name()
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if err != nil {
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return err
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}
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2017-07-15 16:27:59 +02:00
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// open datagram socket
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2017-07-20 15:06:24 +02:00
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fd, err := unix.Socket(
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unix.AF_INET,
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unix.SOCK_DGRAM,
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2017-07-15 16:27:59 +02:00
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0,
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)
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if err != nil {
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return err
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}
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2017-07-20 15:06:24 +02:00
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defer unix.Close(fd)
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2017-07-18 14:15:29 +02:00
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2017-07-15 16:27:59 +02:00
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// do ioctl call
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2018-02-13 16:43:07 +01:00
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var ifr [ifReqSize]byte
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2020-02-28 18:10:16 +01:00
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copy(ifr[:], name)
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2018-05-23 02:10:54 +02:00
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*(*uint32)(unsafe.Pointer(&ifr[unix.IFNAMSIZ])) = uint32(n)
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2017-07-20 15:06:24 +02:00
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_, _, errno := unix.Syscall(
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unix.SYS_IOCTL,
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2017-07-15 16:27:59 +02:00
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uintptr(fd),
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2017-07-20 15:06:24 +02:00
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uintptr(unix.SIOCSIFMTU),
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2017-07-15 16:27:59 +02:00
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uintptr(unsafe.Pointer(&ifr[0])),
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)
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if errno != 0 {
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2018-05-21 17:27:18 +02:00
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return errors.New("failed to set MTU of TUN device")
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2017-07-15 16:27:59 +02:00
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}
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return nil
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}
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2019-03-01 00:05:57 +01:00
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func (tun *NativeTun) MTU() (int, error) {
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2020-02-28 18:10:16 +01:00
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name, err := tun.Name()
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if err != nil {
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return 0, err
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}
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2017-07-11 22:48:58 +02:00
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// open datagram socket
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2017-07-20 15:06:24 +02:00
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fd, err := unix.Socket(
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unix.AF_INET,
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unix.SOCK_DGRAM,
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2017-07-11 22:48:58 +02:00
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0,
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)
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if err != nil {
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return 0, err
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}
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2017-07-20 15:06:24 +02:00
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defer unix.Close(fd)
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2017-07-18 14:15:29 +02:00
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2017-07-11 22:48:58 +02:00
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// do ioctl call
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2018-02-13 16:43:07 +01:00
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var ifr [ifReqSize]byte
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2020-02-28 18:10:16 +01:00
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copy(ifr[:], name)
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2017-07-20 15:06:24 +02:00
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_, _, errno := unix.Syscall(
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unix.SYS_IOCTL,
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2017-07-11 22:48:58 +02:00
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uintptr(fd),
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2017-07-20 15:06:24 +02:00
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uintptr(unix.SIOCGIFMTU),
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2017-07-11 22:48:58 +02:00
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uintptr(unsafe.Pointer(&ifr[0])),
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)
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if errno != 0 {
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2019-03-07 01:51:41 +01:00
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return 0, errors.New("failed to get MTU of TUN device: " + errno.Error())
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2017-07-11 22:48:58 +02:00
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}
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2018-05-23 02:10:54 +02:00
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return int(*(*int32)(unsafe.Pointer(&ifr[unix.IFNAMSIZ]))), nil
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2017-06-04 21:48:15 +02:00
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}
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2019-03-01 00:05:57 +01:00
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func (tun *NativeTun) Name() (string, error) {
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2020-02-28 18:10:16 +01:00
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tun.nameOnce.Do(tun.initNameCache)
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return tun.nameCache, tun.nameErr
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}
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func (tun *NativeTun) initNameCache() {
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tun.nameCache, tun.nameErr = tun.nameSlow()
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}
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func (tun *NativeTun) nameSlow() (string, error) {
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2019-03-07 01:51:41 +01:00
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sysconn, err := tun.tunFile.SyscallConn()
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if err != nil {
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return "", err
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}
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2018-04-18 16:39:14 +02:00
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var ifr [ifReqSize]byte
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2019-03-07 01:51:41 +01:00
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var errno syscall.Errno
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err = sysconn.Control(func(fd uintptr) {
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_, _, errno = unix.Syscall(
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unix.SYS_IOCTL,
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fd,
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uintptr(unix.TUNGETIFF),
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|
uintptr(unsafe.Pointer(&ifr[0])),
|
|
|
|
)
|
|
|
|
})
|
|
|
|
if err != nil {
|
|
|
|
return "", errors.New("failed to get name of TUN device: " + err.Error())
|
|
|
|
}
|
2018-04-18 16:39:14 +02:00
|
|
|
if errno != 0 {
|
2019-03-07 01:51:41 +01:00
|
|
|
return "", errors.New("failed to get name of TUN device: " + errno.Error())
|
2018-04-18 16:39:14 +02:00
|
|
|
}
|
2020-02-28 18:10:16 +01:00
|
|
|
name := ifr[:]
|
|
|
|
if i := bytes.IndexByte(name, 0); i != -1 {
|
|
|
|
name = name[:i]
|
2018-05-05 02:47:35 +02:00
|
|
|
}
|
2020-02-28 18:10:16 +01:00
|
|
|
return string(name), nil
|
2018-04-18 16:39:14 +02:00
|
|
|
}
|
|
|
|
|
2019-03-01 00:05:57 +01:00
|
|
|
func (tun *NativeTun) Write(buff []byte, offset int) (int, error) {
|
2017-12-04 21:39:06 +01:00
|
|
|
|
2018-02-28 12:40:56 +01:00
|
|
|
if tun.nopi {
|
|
|
|
buff = buff[offset:]
|
|
|
|
} else {
|
|
|
|
// reserve space for header
|
2017-12-04 21:39:06 +01:00
|
|
|
|
2018-02-28 12:40:56 +01:00
|
|
|
buff = buff[offset-4:]
|
2017-12-04 21:39:06 +01:00
|
|
|
|
2018-02-28 12:40:56 +01:00
|
|
|
// add packet information header
|
2017-12-04 21:39:06 +01:00
|
|
|
|
2018-02-28 12:40:56 +01:00
|
|
|
buff[0] = 0x00
|
|
|
|
buff[1] = 0x00
|
2017-12-04 21:39:06 +01:00
|
|
|
|
2018-04-20 05:30:22 +02:00
|
|
|
if buff[4]>>4 == ipv6.Version {
|
2018-02-28 12:40:56 +01:00
|
|
|
buff[2] = 0x86
|
|
|
|
buff[3] = 0xdd
|
|
|
|
} else {
|
|
|
|
buff[2] = 0x08
|
|
|
|
buff[3] = 0x00
|
|
|
|
}
|
2017-12-04 21:39:06 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
// write
|
|
|
|
|
2018-10-17 21:26:53 +02:00
|
|
|
return tun.tunFile.Write(buff)
|
2017-06-04 21:48:15 +02:00
|
|
|
}
|
|
|
|
|
2019-03-21 21:43:04 +01:00
|
|
|
func (tun *NativeTun) Flush() error {
|
2019-06-06 23:00:15 +02:00
|
|
|
// TODO: can flushing be implemented by buffering and using sendmmsg?
|
2019-03-21 21:43:04 +01:00
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
2019-03-07 01:51:41 +01:00
|
|
|
func (tun *NativeTun) Read(buff []byte, offset int) (int, error) {
|
2017-08-17 00:25:39 +02:00
|
|
|
select {
|
|
|
|
case err := <-tun.errors:
|
|
|
|
return 0, err
|
|
|
|
default:
|
2018-02-28 12:40:56 +01:00
|
|
|
if tun.nopi {
|
2018-10-17 21:26:53 +02:00
|
|
|
return tun.tunFile.Read(buff[offset:])
|
2018-02-28 12:40:56 +01:00
|
|
|
} else {
|
|
|
|
buff := buff[offset-4:]
|
2018-10-17 21:26:53 +02:00
|
|
|
n, err := tun.tunFile.Read(buff[:])
|
2018-02-28 12:40:56 +01:00
|
|
|
if n < 4 {
|
|
|
|
return 0, err
|
|
|
|
}
|
|
|
|
return n - 4, err
|
2017-12-04 21:39:06 +01:00
|
|
|
}
|
2017-08-17 00:25:39 +02:00
|
|
|
}
|
2017-06-04 21:48:15 +02:00
|
|
|
}
|
|
|
|
|
2019-06-10 23:33:40 +02:00
|
|
|
func (tun *NativeTun) Events() chan Event {
|
2017-08-07 15:25:04 +02:00
|
|
|
return tun.events
|
|
|
|
}
|
|
|
|
|
2019-03-01 00:05:57 +01:00
|
|
|
func (tun *NativeTun) Close() error {
|
2018-05-14 14:08:03 +02:00
|
|
|
var err1 error
|
2018-05-21 14:16:46 +02:00
|
|
|
if tun.statusListenersShutdown != nil {
|
|
|
|
close(tun.statusListenersShutdown)
|
|
|
|
if tun.netlinkCancel != nil {
|
|
|
|
err1 = tun.netlinkCancel.Cancel()
|
|
|
|
}
|
|
|
|
} else if tun.events != nil {
|
|
|
|
close(tun.events)
|
2018-05-14 14:08:03 +02:00
|
|
|
}
|
2018-10-17 21:26:53 +02:00
|
|
|
err2 := tun.tunFile.Close()
|
2018-05-14 02:14:33 +02:00
|
|
|
|
|
|
|
if err1 != nil {
|
|
|
|
return err1
|
|
|
|
}
|
2019-03-07 01:51:41 +01:00
|
|
|
return err2
|
2017-08-07 15:25:04 +02:00
|
|
|
}
|
|
|
|
|
2019-06-10 23:33:40 +02:00
|
|
|
func CreateTUN(name string, mtu int) (Device, error) {
|
2019-02-27 04:10:01 +01:00
|
|
|
nfd, err := unix.Open(cloneDevicePath, os.O_RDWR, 0)
|
|
|
|
if err != nil {
|
2020-03-18 21:23:00 +01:00
|
|
|
if os.IsNotExist(err) {
|
|
|
|
return nil, fmt.Errorf("CreateTUN(%q) failed; %s does not exist", name, cloneDevicePath)
|
|
|
|
}
|
2019-02-27 04:10:01 +01:00
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
|
2018-02-13 16:43:07 +01:00
|
|
|
var ifr [ifReqSize]byte
|
|
|
|
var flags uint16 = unix.IFF_TUN // | unix.IFF_NO_PI (disabled for TUN status hack)
|
2017-06-04 21:48:15 +02:00
|
|
|
nameBytes := []byte(name)
|
2017-07-20 15:06:24 +02:00
|
|
|
if len(nameBytes) >= unix.IFNAMSIZ {
|
2018-05-14 02:14:33 +02:00
|
|
|
return nil, errors.New("interface name too long")
|
2017-06-04 21:48:15 +02:00
|
|
|
}
|
|
|
|
copy(ifr[:], nameBytes)
|
2018-05-23 02:10:54 +02:00
|
|
|
*(*uint16)(unsafe.Pointer(&ifr[unix.IFNAMSIZ])) = flags
|
2017-06-04 21:48:15 +02:00
|
|
|
|
2019-02-27 04:10:01 +01:00
|
|
|
_, _, errno := unix.Syscall(
|
|
|
|
unix.SYS_IOCTL,
|
2019-03-07 01:51:41 +01:00
|
|
|
uintptr(nfd),
|
2019-02-27 04:10:01 +01:00
|
|
|
uintptr(unix.TUNSETIFF),
|
|
|
|
uintptr(unsafe.Pointer(&ifr[0])),
|
|
|
|
)
|
2017-06-04 21:48:15 +02:00
|
|
|
if errno != 0 {
|
2017-08-17 00:25:39 +02:00
|
|
|
return nil, errno
|
2017-06-04 21:48:15 +02:00
|
|
|
}
|
2019-03-07 01:51:41 +01:00
|
|
|
err = unix.SetNonblock(nfd, true)
|
|
|
|
|
|
|
|
// Note that the above -- open,ioctl,nonblock -- must happen prior to handing it to netpoll as below this line.
|
|
|
|
|
|
|
|
fd := os.NewFile(uintptr(nfd), cloneDevicePath)
|
|
|
|
if err != nil {
|
|
|
|
return nil, err
|
|
|
|
}
|
2017-06-04 21:48:15 +02:00
|
|
|
|
2019-02-27 04:10:01 +01:00
|
|
|
return CreateTUNFromFile(fd, mtu)
|
2018-05-05 03:36:09 +02:00
|
|
|
}
|
2017-07-11 22:48:58 +02:00
|
|
|
|
2019-06-10 23:33:40 +02:00
|
|
|
func CreateTUNFromFile(file *os.File, mtu int) (Device, error) {
|
2019-03-01 00:05:57 +01:00
|
|
|
tun := &NativeTun{
|
2018-10-17 21:26:53 +02:00
|
|
|
tunFile: file,
|
2019-06-10 23:33:40 +02:00
|
|
|
events: make(chan Event, 5),
|
2018-05-14 03:43:56 +02:00
|
|
|
errors: make(chan error, 5),
|
2018-05-14 04:19:25 +02:00
|
|
|
statusListenersShutdown: make(chan struct{}),
|
2018-10-17 21:26:53 +02:00
|
|
|
nopi: false,
|
2017-07-15 16:27:59 +02:00
|
|
|
}
|
2018-05-05 03:36:09 +02:00
|
|
|
|
2020-02-28 18:10:16 +01:00
|
|
|
name, err := tun.Name()
|
2018-05-05 03:36:09 +02:00
|
|
|
if err != nil {
|
|
|
|
return nil, err
|
|
|
|
}
|
2017-07-15 16:27:59 +02:00
|
|
|
|
2017-08-17 12:58:18 +02:00
|
|
|
// start event listener
|
2017-08-17 00:25:39 +02:00
|
|
|
|
2020-02-28 18:10:16 +01:00
|
|
|
tun.index, err = getIFIndex(name)
|
2017-08-17 00:25:39 +02:00
|
|
|
if err != nil {
|
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
|
2018-05-14 12:27:29 +02:00
|
|
|
tun.netlinkSock, err = createNetlinkSocket()
|
2018-05-14 02:14:33 +02:00
|
|
|
if err != nil {
|
2018-05-14 14:08:03 +02:00
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
tun.netlinkCancel, err = rwcancel.NewRWCancel(tun.netlinkSock)
|
|
|
|
if err != nil {
|
2019-02-27 02:20:17 +01:00
|
|
|
unix.Close(tun.netlinkSock)
|
2018-05-14 02:14:33 +02:00
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
|
2018-05-21 03:31:44 +02:00
|
|
|
tun.hackListenerClosed.Lock()
|
2018-05-23 02:10:54 +02:00
|
|
|
go tun.routineNetlinkListener()
|
|
|
|
go tun.routineHackListener() // cross namespace
|
2018-05-14 12:27:29 +02:00
|
|
|
|
2018-05-23 02:10:54 +02:00
|
|
|
err = tun.setMTU(mtu)
|
2018-05-14 02:14:33 +02:00
|
|
|
if err != nil {
|
2019-02-27 02:20:17 +01:00
|
|
|
unix.Close(tun.netlinkSock)
|
2018-05-14 02:14:33 +02:00
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
|
2018-05-14 12:27:29 +02:00
|
|
|
return tun, nil
|
2017-06-04 21:48:15 +02:00
|
|
|
}
|
2019-03-03 05:20:13 +01:00
|
|
|
|
2019-06-10 23:33:40 +02:00
|
|
|
func CreateUnmonitoredTUNFromFD(fd int) (Device, string, error) {
|
2019-03-07 01:51:41 +01:00
|
|
|
err := unix.SetNonblock(fd, true)
|
|
|
|
if err != nil {
|
|
|
|
return nil, "", err
|
|
|
|
}
|
|
|
|
file := os.NewFile(uintptr(fd), "/dev/tun")
|
2019-03-03 05:20:13 +01:00
|
|
|
tun := &NativeTun{
|
|
|
|
tunFile: file,
|
2019-06-10 23:33:40 +02:00
|
|
|
events: make(chan Event, 5),
|
2019-03-03 05:20:13 +01:00
|
|
|
errors: make(chan error, 5),
|
|
|
|
nopi: true,
|
|
|
|
}
|
|
|
|
name, err := tun.Name()
|
|
|
|
if err != nil {
|
|
|
|
return nil, "", err
|
|
|
|
}
|
|
|
|
return tun, name, nil
|
|
|
|
}
|