Move tun to subpackage

1 files changed, 0 insertions, 360 deletions

diff --git a/tun_openbsd.go b/tun_openbsd.go
deleted file mode 100644
index 932404e..0000000
--- a/tun_openbsd.go
+++ /dev/null
@@ -1,360 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0
- *
- * Copyright (C) 2017-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
- */
-
-package main
-
-import (
-	"./rwcancel"
-	"errors"
-	"fmt"
-	"golang.org/x/net/ipv6"
-	"golang.org/x/sys/unix"
-	"io/ioutil"
-	"net"
-	"os"
-	"syscall"
-	"unsafe"
-)
-
-// Structure for iface mtu get/set ioctls
-type ifreq_mtu struct {
-	Name [unix.IFNAMSIZ]byte
-	MTU  uint32
-	Pad0 [12]byte
-}
-
-const _TUNSIFMODE = 0x8004745d
-
-type NativeTun struct {
-	name        string
-	fd          *os.File
-	rwcancel    *rwcancel.RWCancel
-	events      chan TUNEvent
-	errors      chan error
-	routeSocket int
-}
-
-func (tun *NativeTun) RoutineRouteListener(tunIfindex int) {
-	var (
-		statusUp  bool
-		statusMTU int
-	)
-
-	defer close(tun.events)
-
-	data := make([]byte, os.Getpagesize())
-	for {
-		n, err := unix.Read(tun.routeSocket, data)
-		if err != nil {
-			tun.errors <- err
-			return
-		}
-
-		if n < 8 {
-			continue
-		}
-
-		if data[3 /* type */] != unix.RTM_IFINFO {
-			continue
-		}
-		ifindex := int(*(*uint16)(unsafe.Pointer(&data[6 /* ifindex */])))
-		if ifindex != tunIfindex {
-			continue
-		}
-
-		iface, err := net.InterfaceByIndex(ifindex)
-		if err != nil {
-			tun.errors <- err
-			return
-		}
-
-		// Up / Down event
-		up := (iface.Flags & net.FlagUp) != 0
-		if up != statusUp && up {
-			tun.events <- TUNEventUp
-		}
-		if up != statusUp && !up {
-			tun.events <- TUNEventDown
-		}
-		statusUp = up
-
-		// MTU changes
-		if iface.MTU != statusMTU {
-			tun.events <- TUNEventMTUUpdate
-		}
-		statusMTU = iface.MTU
-	}
-}
-
-func errorIsEBUSY(err error) bool {
-	if pe, ok := err.(*os.PathError); ok {
-		if errno, ok := pe.Err.(syscall.Errno); ok && errno == syscall.EBUSY {
-			return true
-		}
-	}
-	if errno, ok := err.(syscall.Errno); ok && errno == syscall.EBUSY {
-		return true
-	}
-	return false
-}
-
-func CreateTUN(name string) (TUNDevice, error) {
-	ifIndex := -1
-	if name != "tun" {
-		_, err := fmt.Sscanf(name, "tun%d", &ifIndex)
-		if err != nil || ifIndex < 0 {
-			return nil, fmt.Errorf("Interface name must be tun[0-9]*")
-		}
-	}
-
-	var tunfile *os.File
-	var err error
-
-	if ifIndex != -1 {
-		tunfile, err = os.OpenFile(fmt.Sprintf("/dev/tun%d", ifIndex), unix.O_RDWR, 0)
-	} else {
-		for ifIndex = 0; ifIndex < 256; ifIndex += 1 {
-			tunfile, err = os.OpenFile(fmt.Sprintf("/dev/tun%d", ifIndex), unix.O_RDWR, 0)
-			if err == nil || !errorIsEBUSY(err) {
-				break
-			}
-		}
-	}
-
-	if err != nil {
-		return nil, err
-	}
-
-	// Set TUN iface to broadcast mode
-	ifmodemode := unix.IFF_BROADCAST
-	_, _, errno := unix.Syscall(
-		unix.SYS_IOCTL,
-		uintptr(tunfile.Fd()),
-		uintptr(_TUNSIFMODE),
-		uintptr(unsafe.Pointer(&ifmodemode)),
-	)
-
-	if errno != 0 {
-		return nil, fmt.Errorf("error %s", errno.Error())
-	}
-
-	tun, err := CreateTUNFromFile(tunfile)
-
-	if err == nil && name == "tun" {
-		fname := os.Getenv("WG_TUN_NAME_FILE")
-		if fname != "" {
-			ioutil.WriteFile(fname, []byte(tun.(*NativeTun).name+"\n"), 0400)
-		}
-	}
-
-	return tun, err
-}
-
-func CreateTUNFromFile(file *os.File) (TUNDevice, error) {
-
-	tun := &NativeTun{
-		fd:     file,
-		events: make(chan TUNEvent, 10),
-		errors: make(chan error, 1),
-	}
-
-	name, err := tun.Name()
-	if err != nil {
-		tun.fd.Close()
-		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.fd.Close()
-		return nil, err
-	}
-
-	tun.rwcancel, err = rwcancel.NewRWCancel(int(file.Fd()))
-	if err != nil {
-		tun.fd.Close()
-		return nil, err
-	}
-
-	tun.routeSocket, err = unix.Socket(unix.AF_ROUTE, unix.SOCK_RAW, unix.AF_UNSPEC)
-	if err != nil {
-		tun.fd.Close()
-		return nil, err
-	}
-
-	go tun.RoutineRouteListener(tunIfindex)
-
-	// set default MTU
-	err = tun.setMTU(DefaultMTU)
-	if err != nil {
-		tun.Close()
-		return nil, err
-	}
-
-	return tun, nil
-}
-
-func (tun *NativeTun) Name() (string, error) {
-	gostat, err := tun.fd.Stat()
-	if err != nil {
-		tun.name = ""
-		return "", err
-	}
-	stat := gostat.Sys().(*syscall.Stat_t)
-	tun.name = fmt.Sprintf("tun%d", stat.Rdev%256)
-	return tun.name, nil
-}
-
-func (tun *NativeTun) File() *os.File {
-	return tun.fd
-}
-
-func (tun *NativeTun) Events() chan TUNEvent {
-	return tun.events
-}
-
-func (tun *NativeTun) doRead(buff []byte, offset int) (int, error) {
-	select {
-	case err := <-tun.errors:
-		return 0, err
-	default:
-		buff := buff[offset-4:]
-		n, err := tun.fd.Read(buff[:])
-		if n < 4 {
-			return 0, err
-		}
-		return n - 4, err
-	}
-}
-
-func (tun *NativeTun) Read(buff []byte, offset int) (int, error) {
-	for {
-		n, err := tun.doRead(buff, offset)
-		if err == nil || !rwcancel.ErrorIsEAGAIN(err) {
-			return n, err
-		}
-		if !tun.rwcancel.ReadyRead() {
-			return 0, errors.New("tun device closed")
-		}
-	}
-}
-
-func (tun *NativeTun) Write(buff []byte, offset int) (int, error) {
-
-	// reserve space for header
-
-	buff = buff[offset-4:]
-
-	// add packet information header
-
-	buff[0] = 0x00
-	buff[1] = 0x00
-	buff[2] = 0x00
-
-	if buff[4]>>4 == ipv6.Version {
-		buff[3] = unix.AF_INET6
-	} else {
-		buff[3] = unix.AF_INET
-	}
-
-	// write
-
-	return tun.fd.Write(buff)
-}
-
-func (tun *NativeTun) Close() error {
-	var err3 error
-	err1 := tun.rwcancel.Cancel()
-	err2 := tun.fd.Close()
-	if tun.routeSocket != -1 {
-		unix.Shutdown(tun.routeSocket, unix.SHUT_RDWR)
-		err3 = unix.Close(tun.routeSocket)
-		tun.routeSocket = -1
-	} else if tun.events != nil {
-		close(tun.events)
-	}
-	if err1 != nil {
-		return err1
-	}
-	if err2 != nil {
-		return err2
-	}
-	return err3
-}
-
-func (tun *NativeTun) setMTU(n int) error {
-	// open datagram socket
-
-	var fd int
-
-	fd, err := unix.Socket(
-		unix.AF_INET,
-		unix.SOCK_DGRAM,
-		0,
-	)
-
-	if err != nil {
-		return err
-	}
-
-	defer unix.Close(fd)
-
-	// do ioctl call
-
-	var ifr ifreq_mtu
-	copy(ifr.Name[:], tun.name)
-	ifr.MTU = uint32(n)
-
-	_, _, errno := unix.Syscall(
-		unix.SYS_IOCTL,
-		uintptr(fd),
-		uintptr(unix.SIOCSIFMTU),
-		uintptr(unsafe.Pointer(&ifr)),
-	)
-
-	if errno != 0 {
-		return fmt.Errorf("failed to set MTU on %s", tun.name)
-	}
-
-	return nil
-}
-
-func (tun *NativeTun) MTU() (int, error) {
-	// open datagram socket
-
-	fd, err := unix.Socket(
-		unix.AF_INET,
-		unix.SOCK_DGRAM,
-		0,
-	)
-
-	if err != nil {
-		return 0, err
-	}
-
-	defer unix.Close(fd)
-
-	// do ioctl call
-	var ifr ifreq_mtu
-	copy(ifr.Name[:], tun.name)
-
-	_, _, errno := unix.Syscall(
-		unix.SYS_IOCTL,
-		uintptr(fd),
-		uintptr(unix.SIOCGIFMTU),
-		uintptr(unsafe.Pointer(&ifr)),
-	)
-	if errno != 0 {
-		return 0, fmt.Errorf("failed to get MTU on %s", tun.name)
-	}
-
-	return int(*(*int32)(unsafe.Pointer(&ifr.MTU))), nil
-}