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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2019-2021 WireGuard LLC. All Rights Reserved.
*/
package tunnel_test
import (
"bytes"
"crypto/rand"
"encoding/binary"
"fmt"
"net"
"sync"
"testing"
"time"
"golang.org/x/sys/windows"
"golang.zx2c4.com/wireguard/tun"
"golang.zx2c4.com/wireguard/windows/elevate"
"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
)
func TestWintunOrdering(t *testing.T) {
var tunDevice tun.Device
err := elevate.DoAsSystem(func() error {
var err error
tunDevice, err = tun.CreateTUNWithRequestedGUID("tunordertest", &windows.GUID{12, 12, 12, [8]byte{12, 12, 12, 12, 12, 12, 12, 12}}, 1500)
return err
})
if err != nil {
t.Fatal(err)
}
defer tunDevice.Close()
nativeTunDevice := tunDevice.(*tun.NativeTun)
luid := winipcfg.LUID(nativeTunDevice.LUID())
ip, ipnet, _ := net.ParseCIDR("10.82.31.4/24")
err = luid.SetIPAddresses([]net.IPNet{{ip, ipnet.Mask}})
if err != nil {
t.Fatal(err)
}
err = luid.SetRoutes([]*winipcfg.RouteData{{*ipnet, ipnet.IP, 0}})
if err != nil {
t.Fatal(err)
}
var token [32]byte
_, err = rand.Read(token[:])
if err != nil {
t.Fatal(err)
}
var sockWrite net.Conn
for i := 0; i < 1000; i++ {
sockWrite, err = net.Dial("udp", "10.82.31.5:9999")
if err == nil {
defer sockWrite.Close()
break
}
time.Sleep(time.Millisecond * 100)
}
if err != nil {
t.Fatal(err)
}
var sockRead *net.UDPConn
for i := 0; i < 1000; i++ {
var listenAddress *net.UDPAddr
listenAddress, err = net.ResolveUDPAddr("udp", "10.82.31.4:9999")
if err != nil {
continue
}
sockRead, err = net.ListenUDP("udp", listenAddress)
if err == nil {
defer sockRead.Close()
break
}
time.Sleep(time.Millisecond * 100)
}
if err != nil {
t.Fatal(err)
}
var wait sync.WaitGroup
wait.Add(4)
doneSockWrite := false
doneTunWrite := false
fatalErrors := make(chan error, 2)
errors := make(chan error, 2)
go func() {
defer wait.Done()
buffer := append(token[:], 0, 0, 0, 0, 0, 0, 0, 0)
for sendingIndex := uint64(0); !doneSockWrite; sendingIndex++ {
binary.LittleEndian.PutUint64(buffer[32:], sendingIndex)
_, err := sockWrite.Write(buffer[:])
if err != nil {
fatalErrors <- err
}
}
}()
go func() {
defer wait.Done()
packet := [20 + 8 + 32 + 8]byte{
0x45, 0, 0, 20 + 8 + 32 + 8,
0, 0, 0, 0,
0x80, 0x11, 0, 0,
10, 82, 31, 5,
10, 82, 31, 4,
8888 >> 8, 8888 & 0xff, 9999 >> 8, 9999 & 0xff, 0, 8 + 32 + 8, 0, 0,
}
copy(packet[28:], token[:])
for sendingIndex := uint64(0); !doneTunWrite; sendingIndex++ {
binary.BigEndian.PutUint16(packet[4:], uint16(sendingIndex))
var checksum uint32
for i := 0; i < 20; i += 2 {
if i != 10 {
checksum += uint32(binary.BigEndian.Uint16(packet[i:]))
}
}
binary.BigEndian.PutUint16(packet[10:], ^(uint16(checksum>>16) + uint16(checksum&0xffff)))
binary.LittleEndian.PutUint64(packet[20+8+32:], sendingIndex)
n, err := tunDevice.Write(packet[:], 0)
if err != nil {
fatalErrors <- err
}
if n == 0 {
time.Sleep(time.Millisecond * 300)
}
}
}()
const packetsPerTest = 1 << 21
go func() {
defer func() {
doneSockWrite = true
wait.Done()
}()
var expectedIndex uint64
for i := uint64(0); i < packetsPerTest; {
var buffer [(1 << 16) - 1]byte
bytesRead, err := tunDevice.Read(buffer[:], 0)
if err != nil {
fatalErrors <- err
}
if bytesRead < 0 || bytesRead > len(buffer) {
continue
}
packet := buffer[:bytesRead]
tokenPos := bytes.Index(packet, token[:])
if tokenPos == -1 || tokenPos+32+8 > len(packet) {
continue
}
foundIndex := binary.LittleEndian.Uint64(packet[tokenPos+32:])
if foundIndex < expectedIndex {
errors <- fmt.Errorf("Sock write, tun read: expected packet %d, received packet %d", expectedIndex, foundIndex)
}
expectedIndex = foundIndex + 1
i++
}
}()
go func() {
defer func() {
doneTunWrite = true
wait.Done()
}()
var expectedIndex uint64
for i := uint64(0); i < packetsPerTest; {
var buffer [(1 << 16) - 1]byte
bytesRead, err := sockRead.Read(buffer[:])
if err != nil {
fatalErrors <- err
}
if bytesRead < 0 || bytesRead > len(buffer) {
continue
}
packet := buffer[:bytesRead]
if len(packet) != 32+8 || !bytes.HasPrefix(packet, token[:]) {
continue
}
foundIndex := binary.LittleEndian.Uint64(packet[32:])
if foundIndex < expectedIndex {
errors <- fmt.Errorf("Tun write, sock read: expected packet %d, received packet %d", expectedIndex, foundIndex)
}
expectedIndex = foundIndex + 1
i++
}
}()
done := make(chan bool, 2)
doneFunc := func() {
wait.Wait()
done <- true
}
defer doneFunc()
go doneFunc()
for {
select {
case err := <-fatalErrors:
t.Fatal(err)
case err := <-errors:
t.Error(err)
case <-done:
return
}
}
}
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