forked from sbilly/go-windivert2
/
windivert.go
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/
windivert.go
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package windivert
import (
"errors"
"fmt"
"path/filepath"
"runtime"
"strconv"
"strings"
"sync"
"syscall"
"unsafe"
"golang.org/x/sys/windows"
)
var (
winDivert = (*windows.DLL)(nil)
winDivertOpen = (*windows.Proc)(nil)
windivertsys = ""
windivertdll = ""
DeviceName = windows.StringToUTF16Ptr("WinDivert")
)
func init() {
if err := checkForWow64(); err != nil {
panic(err)
}
system32, err := windows.GetSystemDirectory()
if err != nil {
panic(err)
}
windivertsys = filepath.Join(system32, "WinDivert"+strconv.Itoa(32<<(^uint(0)>>63))+".sys")
windivertdll = filepath.Join(system32, "WinDivert.dll")
if err := InstallDriver(); err != nil {
panic(err)
}
winDivert = windows.MustLoadDLL("WinDivert.dll")
winDivertOpen = winDivert.MustFindProc("WinDivertOpen")
var vers = map[string]struct{}{
"2.0": struct{}{},
"2.1": struct{}{},
"2.2": struct{}{},
}
hd, err := Open("false", LayerNetwork, PriorityDefault, FlagDefault)
if err != nil {
panic(err)
}
defer hd.Close()
major, err := hd.GetParam(VersionMajor)
if err != nil {
panic(err)
}
minor, err := hd.GetParam(VersionMinor)
if err != nil {
panic(err)
}
if err := hd.Shutdown(ShutdownBoth); err != nil {
panic(err)
}
ver := strings.Join([]string{strconv.Itoa(int(major)), strconv.Itoa(int(minor))}, ".")
if _, ok := vers[ver]; !ok {
s := ""
for k, _ := range vers {
s += k
}
panic(fmt.Errorf("unsupported version %v of windivert, only support %v", ver, s))
}
}
func checkForWow64() error {
var b bool
err := windows.IsWow64Process(windows.CurrentProcess(), &b)
if err != nil {
return fmt.Errorf("Unable to determine whether the process is running under WOW64: %v", err)
}
if b {
return fmt.Errorf("You must use the 64-bit version of WireGuard on this computer.")
}
return nil
}
func IoControlEx(h windows.Handle, code CtlCode, ioctl unsafe.Pointer, buf *byte, bufLen uint32, overlapped *windows.Overlapped) (iolen uint32, err error) {
err = windows.DeviceIoControl(h, uint32(code), (*byte)(ioctl), uint32(unsafe.Sizeof(IoCtl{})), buf, bufLen, &iolen, overlapped)
if err != windows.ERROR_IO_PENDING {
return
}
err = windows.GetOverlappedResult(h, overlapped, &iolen, true)
return
}
func IoControl(h windows.Handle, code CtlCode, ioctl unsafe.Pointer, buf *byte, bufLen uint32) (iolen uint32, err error) {
event, _ := windows.CreateEvent(nil, 0, 0, nil)
overlapped := windows.Overlapped{
HEvent: event,
}
iolen, err = IoControlEx(h, code, ioctl, buf, bufLen, &overlapped)
windows.CloseHandle(event)
return
}
type Handle struct {
sync.Mutex
windows.Handle
rOverlapped windows.Overlapped
wOverlapped windows.Overlapped
}
func Open(filter string, layer Layer, priority int16, flags uint64) (*Handle, error) {
if priority < PriorityLowest || priority > PriorityHighest {
return nil, fmt.Errorf("Priority %v is not Correct, Max: %v, Min: %v", priority, PriorityHighest, PriorityLowest)
}
filterPtr, err := windows.BytePtrFromString(filter)
if err != nil {
return nil, err
}
runtime.LockOSThread()
hd, _, err := winDivertOpen.Call(uintptr(unsafe.Pointer(filterPtr)), uintptr(layer), uintptr(priority), uintptr(flags))
runtime.UnlockOSThread()
if windows.Handle(hd) == windows.InvalidHandle {
return nil, Error(err.(windows.Errno))
}
rEvent, _ := windows.CreateEvent(nil, 0, 0, nil)
wEvent, _ := windows.CreateEvent(nil, 0, 0, nil)
return &Handle{
Mutex: sync.Mutex{},
Handle: windows.Handle(hd),
rOverlapped: windows.Overlapped{
HEvent: rEvent,
},
wOverlapped: windows.Overlapped{
HEvent: wEvent,
},
}, nil
}
func (h *Handle) Recv(buffer []byte, address *Address) (uint, error) {
addrLen := uint(unsafe.Sizeof(Address{}))
recv := recv{
Addr: uint64(uintptr(unsafe.Pointer(address))),
AddrLenPtr: uint64(uintptr(unsafe.Pointer(&addrLen))),
}
iolen, err := IoControlEx(h.Handle, IoCtlRecv, unsafe.Pointer(&recv), &buffer[0], uint32(len(buffer)), &h.rOverlapped)
if err != nil {
return uint(iolen), Error(err.(syscall.Errno))
}
return uint(iolen), nil
}
func (h *Handle) RecvEx(buffer []byte, address []Address, overlapped *windows.Overlapped) (uint, uint, error) {
addrLen := uint(len(address)) * uint(unsafe.Sizeof(Address{}))
recv := recv{
Addr: uint64(uintptr(unsafe.Pointer(&address[0]))),
AddrLenPtr: uint64(uintptr(unsafe.Pointer(&addrLen))),
}
iolen, err := IoControlEx(h.Handle, IoCtlRecv, unsafe.Pointer(&recv), &buffer[0], uint32(len(buffer)), &h.rOverlapped)
if err != nil {
return uint(iolen), addrLen / uint(unsafe.Sizeof(Address{})), Error(err.(syscall.Errno))
}
return uint(iolen), addrLen / uint(unsafe.Sizeof(Address{})), nil
}
func (h *Handle) Send(buffer []byte, address *Address) (uint, error) {
send := send{
Addr: uint64(uintptr(unsafe.Pointer(address))),
AddrLen: uint64(unsafe.Sizeof(Address{})),
}
iolen, err := IoControlEx(h.Handle, IoCtlSend, unsafe.Pointer(&send), &buffer[0], uint32(len(buffer)), &h.wOverlapped)
if err != nil {
return uint(iolen), Error(err.(syscall.Errno))
}
return uint(iolen), nil
}
func (h *Handle) SendEx(buffer []byte, address []Address, overlapped *windows.Overlapped) (uint, error) {
send := send{
Addr: uint64(uintptr(unsafe.Pointer(&address[0]))),
AddrLen: uint64(unsafe.Sizeof(Address{})) * uint64(len(address)),
}
iolen, err := IoControlEx(h.Handle, IoCtlSend, unsafe.Pointer(&send), &buffer[0], uint32(len(buffer)), &h.wOverlapped)
if err != nil {
return uint(iolen), Error(err.(syscall.Errno))
}
return uint(iolen), nil
}
func (h *Handle) Shutdown(how Shutdown) error {
shutdown := shutdown{
How: uint32(how),
}
_, err := IoControl(h.Handle, IoCtlShutdown, unsafe.Pointer(&shutdown), nil, 0)
if err != nil {
return Error(err.(syscall.Errno))
}
return nil
}
func (h *Handle) Close() error {
windows.CloseHandle(h.rOverlapped.HEvent)
windows.CloseHandle(h.wOverlapped.HEvent)
err := windows.CloseHandle(h.Handle)
if err != nil {
return Error(err.(syscall.Errno))
}
return nil
}
func (h *Handle) GetParam(p Param) (uint64, error) {
getParam := getParam{
Param: uint32(p),
Value: 0,
}
_, err := IoControl(h.Handle, IoCtlGetParam, unsafe.Pointer(&getParam), (*byte)(unsafe.Pointer(&getParam.Value)), uint32(unsafe.Sizeof(getParam.Value)))
if err != nil {
return getParam.Value, Error(err.(syscall.Errno))
}
return getParam.Value, nil
}
func (h *Handle) SetParam(p Param, v uint64) error {
switch p {
case QueueLength:
if v < QueueLengthMin || v > QueueLengthMax {
return fmt.Errorf("Queue length %v is not correct, Max: %v, Min: %v", v, QueueLengthMax, QueueLengthMin)
}
case QueueTime:
if v < QueueTimeMin || v > QueueTimeMax {
return fmt.Errorf("Queue time %v is not correct, Max: %v, Min: %v", v, QueueTimeMax, QueueTimeMin)
}
case QueueSize:
if v < QueueSizeMin || v > QueueSizeMax {
return fmt.Errorf("Queue size %v is not correct, Max: %v, Min: %v", v, QueueSizeMax, QueueSizeMin)
}
default:
return errors.New("VersionMajor and VersionMinor only can be used in function GetParam")
}
setParam := setParam{
Value: v,
Param: uint32(p),
}
_, err := IoControl(h.Handle, IoCtlSetParam, unsafe.Pointer(&setParam), nil, 0)
if err != nil {
return Error(err.(syscall.Errno))
}
return nil
}