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Import windows scafolding

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This commit is contained in:
Jason A. Donenfeld 2019-02-04 17:29:52 +01:00
parent 3af9aa88a3
commit 6f76edd045
6 changed files with 462 additions and 9 deletions
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7
go.mod
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@ -1,7 +1,8 @@
module git.zx2c4.com/wireguard-go
require (
golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9
golang.org/x/net v0.0.0-20181207154023-610586996380
golang.org/x/sys v0.0.0-20181210030007-2a47403f2ae5
github.com/Microsoft/go-winio v0.4.11
golang.org/x/crypto v0.0.0-20190131182504-b8fe1690c613
golang.org/x/net v0.0.0-20190125091013-d26f9f9a57f3
golang.org/x/sys v0.0.0-20190204103248-980327fe3c65
)

14
go.sum
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@ -1,6 +1,8 @@
golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9 h1:mKdxBk7AujPs8kU4m80U72y/zjbZ3UcXC7dClwKbUI0=
golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
golang.org/x/net v0.0.0-20181207154023-610586996380 h1:zPQexyRtNYBc7bcHmehl1dH6TB3qn8zytv8cBGLDNY0=
golang.org/x/net v0.0.0-20181207154023-610586996380/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/sys v0.0.0-20181210030007-2a47403f2ae5 h1:SlFRMb9PEnqzqnBRCynVOhxv4vHjB2lnIoxK6p5nzFM=
golang.org/x/sys v0.0.0-20181210030007-2a47403f2ae5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
github.com/Microsoft/go-winio v0.4.11 h1:zoIOcVf0xPN1tnMVbTtEdI+P8OofVk3NObnwOQ6nK2Q=
github.com/Microsoft/go-winio v0.4.11/go.mod h1:VhR8bwka0BXejwEJY73c50VrPtXAaKcyvVC4A4RozmA=
golang.org/x/crypto v0.0.0-20190131182504-b8fe1690c613 h1:MQ/ZZiDsUapFFiMS+vzwXkCTeEKaum+Do5rINYJDmxc=
golang.org/x/crypto v0.0.0-20190131182504-b8fe1690c613/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
golang.org/x/net v0.0.0-20190125091013-d26f9f9a57f3 h1:ulvT7fqt0yHWzpJwI57MezWnYDVpCAYBVuYst/L+fAY=
golang.org/x/net v0.0.0-20190125091013-d26f9f9a57f3/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/sys v0.0.0-20190204103248-980327fe3c65 h1:kWe3kjq30rdgl/nMB+ZR7kWcMnlZZ35LNkvwLN7yBco=
golang.org/x/sys v0.0.0-20190204103248-980327fe3c65/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=

2
main.go
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@ -1,3 +1,5 @@
// +build !windows
/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2017-2019 WireGuard LLC. All Rights Reserved.

86
main_windows.go Normal file
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@ -0,0 +1,86 @@
/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2017-2019 WireGuard LLC. All Rights Reserved.
*/
package main
import (
"fmt"
"git.zx2c4.com/wireguard-go/tun"
"os"
"os/signal"
)
const (
ExitSetupSuccess = 0
ExitSetupFailed = 1
)
func main() {
if len(os.Args) != 1 {
os.Exit(ExitSetupFailed)
}
//configFile := os.Args[1]
interfaceName := "TODO"
logger := NewLogger(
LogLevelDebug,
fmt.Sprintf("(%s) ", interfaceName),
)
logger.Info.Println("Starting wireguard-go version", WireGuardGoVersion)
logger.Debug.Println("Debug log enabled")
tun, err := tun.CreateTUN(interfaceName)
if err == nil {
realInterfaceName, err2 := tun.Name()
if err2 == nil {
interfaceName = realInterfaceName
}
} else {
logger.Error.Println("Failed to create TUN device:", err)
os.Exit(ExitSetupFailed)
}
device := NewDevice(tun, logger)
logger.Info.Println("Device started")
uapi, err := UAPIListen(interfaceName)
if err != nil {
logger.Error.Println("Failed to listen on uapi socket:", err)
os.Exit(ExitSetupFailed)
}
errs := make(chan error)
term := make(chan os.Signal, 1)
go func() {
for {
conn, err := uapi.Accept()
if err != nil {
errs <- err
return
}
go ipcHandle(device, conn)
}
}()
logger.Info.Println("UAPI listener started")
// wait for program to terminate
signal.Notify(term, os.Interrupt)
select {
case <-term:
case <-errs:
case <-device.Wait():
}
// clean up
uapi.Close()
device.Close()
logger.Info.Println("Shutting down")
}

286
tun/tun_windows.go Normal file
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@ -0,0 +1,286 @@
/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2018-2019 WireGuard LLC. All Rights Reserved.
*/
package tun
import (
"errors"
"fmt"
"os"
"unsafe"
"golang.org/x/sys/windows"
)
const (
TUN_MIN_PACKET_SIZE = 20
TUN_MAX_PACKET_SIZE = 1600
TUN_MAX_PACKET_EXCHANGE = 256 // Number of packets that can be exchanged at a time
TUN_EXCHANGE_BUFFER_SIZE = 410632
)
const (
TUN_SIGNAL_DATA_AVAIL = 0
TUN_SIGNAL_CLOSE = 1
TUN_SIGNAL_MAX = 2
)
type TunPacket struct {
size uint32
data [TUN_MAX_PACKET_SIZE]byte
}
type TunRWQueue struct {
numPackets uint32
packets [TUN_MAX_PACKET_EXCHANGE]TunPacket
left uint32
}
type nativeTun struct {
ifname string
tunName string
signalName *uint16
tunFile *os.File
wrBuff TunRWQueue
rdBuff TunRWQueue
signals [TUN_SIGNAL_MAX]windows.Handle
rdNextPacket uint32
events chan TUNEvent
errors chan error
}
func CreateTUN(ifname string) (TUNDevice, error) {
signalNameUTF16, err := windows.UTF16PtrFromString(fmt.Sprintf("Global\\TUN_EVENT_%s", ifname))
if err != nil {
return nil, err
}
// Create instance.
tun := &nativeTun{
ifname: ifname,
tunName: fmt.Sprintf("\\\\.\\Global\\TUN_%s_DEVICE", ifname),
signalName: signalNameUTF16,
events: make(chan TUNEvent, 10),
errors: make(chan error, 1),
}
// Create close event.
tun.signals[TUN_SIGNAL_CLOSE], err = windows.CreateEvent(nil, 1 /*TRUE*/, 0 /*FALSE*/, nil)
if err != nil {
return nil, err
}
return tun, nil
}
func (tun *nativeTun) openTUN() error {
for {
// Open interface data pipe.
// Data pipe must be opened first, as the interface data available event is created when somebody actually connects to the data pipe.
file, err := os.OpenFile(tun.tunName, os.O_RDWR|os.O_SYNC, 0600)
if err != nil {
// After examining possible error conditions, many arose that were only temporary: windows.ERROR_FILE_NOT_FOUND, "read <filename> closed", etc.
// To simplify, we will enter a retry-loop on _any_ error until session is closed by user.
switch evt, e := windows.WaitForSingleObject(tun.signals[TUN_SIGNAL_CLOSE], 1000); evt {
case windows.WAIT_OBJECT_0, windows.WAIT_ABANDONED:
return errors.New("TUN closed")
case windows.WAIT_TIMEOUT:
continue
default:
return fmt.Errorf("unexpected result from WaitForSingleObject:", e)
}
}
// Open interface data available event.
event, err := windows.OpenEvent(windows.SYNCHRONIZE, false, tun.signalName)
if err != nil {
file.Close()
return fmt.Errorf("opening interface data ready event failed:", err)
}
tun.tunFile = file
tun.signals[TUN_SIGNAL_DATA_AVAIL] = event
return nil
}
}
func (tun *nativeTun) closeTUN() (err error) {
if tun.signals[TUN_SIGNAL_DATA_AVAIL] != 0 {
// Close interface data ready event.
e := windows.CloseHandle(tun.signals[TUN_SIGNAL_DATA_AVAIL])
if err != nil {
err = e
}
tun.signals[TUN_SIGNAL_DATA_AVAIL] = 0
}
if tun.tunFile != nil {
// Close interface data pipe.
e := tun.tunFile.Close()
if err != nil {
err = e
}
tun.tunFile = nil
}
return
}
func (tun *nativeTun) Name() (string, error) {
return tun.ifname, nil
}
func (tun *nativeTun) File() *os.File {
return nil
}
func (tun *nativeTun) Events() chan TUNEvent {
return tun.events
}
func (tun *nativeTun) Close() error {
windows.SetEvent(tun.signals[TUN_SIGNAL_CLOSE])
err := windows.CloseHandle(tun.signals[TUN_SIGNAL_CLOSE])
e := tun.closeTUN()
if err == nil {
err = e
}
if tun.events != nil {
close(tun.events)
}
return err
}
func (tun *nativeTun) MTU() (int, error) {
return 1500, nil
}
func (tun *nativeTun) Read(buff []byte, offset int) (int, error) {
select {
case err := <-tun.errors:
return 0, err
default:
for {
if tun.rdNextPacket < tun.rdBuff.numPackets {
// Get packet from the queue.
tunPacket := &tun.rdBuff.packets[tun.rdNextPacket]
tun.rdNextPacket++
if tunPacket.size < TUN_MIN_PACKET_SIZE || TUN_MAX_PACKET_SIZE < tunPacket.size {
// Invalid packet size.
continue
}
// Copy data.
copy(buff[offset:], tunPacket.data[:tunPacket.size])
return int(tunPacket.size), nil
}
if tun.signals[TUN_SIGNAL_DATA_AVAIL] == 0 {
// Data pipe and interface data available event are not open (yet).
err := tun.openTUN()
if err != nil {
return 0, err
}
}
if tun.rdBuff.numPackets < TUN_MAX_PACKET_EXCHANGE || tun.rdBuff.left == 0 {
// Buffer was not full. Wait for the interface data or user close.
r, err := windows.WaitForMultipleObjects(tun.signals[:], false, windows.INFINITE)
if err != nil {
return 0, fmt.Errorf("waiting for data failed:", err)
}
switch r {
case windows.WAIT_OBJECT_0 + TUN_SIGNAL_DATA_AVAIL:
// Data is available.
case windows.WAIT_ABANDONED + TUN_SIGNAL_DATA_AVAIL:
// TUN stopped. Reopen it.
tun.closeTUN()
continue
case windows.WAIT_OBJECT_0 + TUN_SIGNAL_CLOSE, windows.WAIT_ABANDONED + TUN_SIGNAL_CLOSE:
return 0, errors.New("TUN closed")
case windows.WAIT_TIMEOUT:
// Congratulations, we reached infinity. Let's do it again! :)
continue
default:
return 0, errors.New("unexpected result from WaitForMultipleObjects")
}
}
// Fill queue.
data := (*[TUN_EXCHANGE_BUFFER_SIZE]byte)(unsafe.Pointer(&tun.rdBuff))
n, err := tun.tunFile.Read(data[:])
tun.rdNextPacket = 0
if n != TUN_EXCHANGE_BUFFER_SIZE || err != nil {
// TUN interface stopped, returned incomplete data, etc.
// Retry.
tun.rdBuff.numPackets = 0
tun.closeTUN()
continue
}
}
}
}
func (tun *nativeTun) flush() error {
// Flush write buffer.
data := (*[TUN_EXCHANGE_BUFFER_SIZE]byte)(unsafe.Pointer(&tun.wrBuff))
n, err := tun.tunFile.Write(data[:])
tun.wrBuff.numPackets = 0
if err != nil {
return err
}
if n != TUN_EXCHANGE_BUFFER_SIZE {
return fmt.Errorf("%d byte(s) written, %d byte(s) expected", n, TUN_EXCHANGE_BUFFER_SIZE)
}
return nil
}
func (tun *nativeTun) putTunPacket(buff []byte) error {
size := len(buff)
if size == 0 {
return errors.New("empty packet")
}
if size > TUN_MAX_PACKET_SIZE {
return errors.New("packet too big")
}
if tun.wrBuff.numPackets >= TUN_MAX_PACKET_EXCHANGE {
// Queue is full -> flush first.
err := tun.flush()
if err != nil {
return err
}
}
// Push packet to the buffer.
tunPacket := &tun.wrBuff.packets[tun.wrBuff.numPackets]
tunPacket.size = uint32(size)
copy(tunPacket.data[:size], buff)
tun.wrBuff.numPackets++
return nil
}
func (tun *nativeTun) Write(buff []byte, offset int) (int, error) {
err := tun.putTunPacket(buff[offset:])
if err != nil {
return 0, err
}
// Flush write buffer.
return len(buff) - offset, tun.flush()
}

76
uapi_windows.go Normal file
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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2017-2019 WireGuard LLC. All Rights Reserved.
*/
package main
import (
"github.com/Microsoft/go-winio"
"net"
)
//TODO: replace these with actual standard windows error numbers from the win package
const (
ipcErrorIO = -int64(5)
ipcErrorProtocol = -int64(71)
ipcErrorInvalid = -int64(22)
ipcErrorPortInUse = -int64(98)
)
type UAPIListener struct {
listener net.Listener // unix socket listener
connNew chan net.Conn
connErr chan error
kqueueFd int
keventFd int
}
func (l *UAPIListener) Accept() (net.Conn, error) {
for {
select {
case conn := <-l.connNew:
return conn, nil
case err := <-l.connErr:
return nil, err
}
}
}
func (l *UAPIListener) Close() error {
return l.listener.Close()
}
func (l *UAPIListener) Addr() net.Addr {
return l.listener.Addr()
}
func UAPIListen(name string) (net.Listener, error) {
config := winio.PipeConfig{
SecurityDescriptor: "", //TODO: we want this to be a very locked down pipe.
}
listener, err := winio.ListenPipe("\\\\.\\pipe\\wireguard\\"+name, &config) //TODO: choose sane name.
if err != nil {
return nil, err
}
uapi := &UAPIListener{
listener: listener,
connNew: make(chan net.Conn, 1),
connErr: make(chan error, 1),
}
go func(l *UAPIListener) {
for {
conn, err := l.listener.Accept()
if err != nil {
l.connErr <- err
break
}
l.connNew <- conn
}
}(uapi)
return uapi, nil
}