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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2020 WireGuard LLC. All Rights Reserved.
*/
package wintun
import (
"errors"
"log"
"runtime"
"syscall"
"unsafe"
"golang.org/x/sys/windows"
)
type loggerLevel int
const (
logInfo loggerLevel = iota
logWarn
logErr
)
const (
PoolNameMax = 256
AdapterNameMax = 128
)
type Pool [PoolNameMax]uint16
type Adapter struct {
handle uintptr
}
var (
modwintun = newLazyDLL("wintun.dll", setupLogger)
procWintunCreateAdapter = modwintun.NewProc("WintunCreateAdapter")
procWintunDeleteAdapter = modwintun.NewProc("WintunDeleteAdapter")
procWintunDeletePoolDriver = modwintun.NewProc("WintunDeletePoolDriver")
procWintunEnumAdapters = modwintun.NewProc("WintunEnumAdapters")
procWintunFreeAdapter = modwintun.NewProc("WintunFreeAdapter")
procWintunOpenAdapter = modwintun.NewProc("WintunOpenAdapter")
procWintunGetAdapterLUID = modwintun.NewProc("WintunGetAdapterLUID")
procWintunGetAdapterName = modwintun.NewProc("WintunGetAdapterName")
procWintunGetRunningDriverVersion = modwintun.NewProc("WintunGetRunningDriverVersion")
procWintunSetAdapterName = modwintun.NewProc("WintunSetAdapterName")
)
func setupLogger(dll *lazyDLL) {
syscall.Syscall(dll.NewProc("WintunSetLogger").Addr(), 1, windows.NewCallback(func(level loggerLevel, msg *uint16) int {
log.Println("[Wintun]", windows.UTF16PtrToString(msg))
return 0
}), 0, 0)
}
func MakePool(poolName string) (pool *Pool, err error) {
poolName16, err := windows.UTF16FromString(poolName)
if err != nil {
return
}
if len(poolName16) > PoolNameMax {
err = errors.New("Pool name too long")
return
}
pool = &Pool{}
copy(pool[:], poolName16)
return
}
func (pool *Pool) String() string {
return windows.UTF16ToString(pool[:])
}
func freeAdapter(wintun *Adapter) {
syscall.Syscall(procWintunFreeAdapter.Addr(), 1, uintptr(wintun.handle), 0, 0)
}
// OpenAdapter finds a Wintun adapter by its name. This function returns the adapter if found, or
// windows.ERROR_FILE_NOT_FOUND otherwise. If the adapter is found but not a Wintun-class or a
// member of the pool, this function returns windows.ERROR_ALREADY_EXISTS. The adapter must be
// released after use.
func (pool *Pool) OpenAdapter(ifname string) (wintun *Adapter, err error) {
ifname16, err := windows.UTF16PtrFromString(ifname)
if err != nil {
return nil, err
}
r0, _, e1 := syscall.Syscall(procWintunOpenAdapter.Addr(), 2, uintptr(unsafe.Pointer(pool)), uintptr(unsafe.Pointer(ifname16)), 0)
if r0 == 0 {
err = e1
return
}
wintun = &Adapter{r0}
runtime.SetFinalizer(wintun, freeAdapter)
return
}
// CreateAdapter creates a Wintun adapter. ifname is the requested name of the adapter, while
// requestedGUID is the GUID of the created network adapter, which then influences NLA generation
// deterministically. If it is set to nil, the GUID is chosen by the system at random, and hence a
// new NLA entry is created for each new adapter. It is called "requested" GUID because the API it
// uses is completely undocumented, and so there could be minor interesting complications with its
// usage. This function returns the network adapter ID and a flag if reboot is required.
func (pool *Pool) CreateAdapter(ifname string, requestedGUID *windows.GUID) (wintun *Adapter, rebootRequired bool, err error) {
var ifname16 *uint16
ifname16, err = windows.UTF16PtrFromString(ifname)
if err != nil {
return
}
var _p0 uint32
r0, _, e1 := syscall.Syscall6(procWintunCreateAdapter.Addr(), 4, uintptr(unsafe.Pointer(pool)), uintptr(unsafe.Pointer(ifname16)), uintptr(unsafe.Pointer(requestedGUID)), uintptr(unsafe.Pointer(&_p0)), 0, 0)
rebootRequired = _p0 != 0
if r0 == 0 {
err = e1
return
}
wintun = &Adapter{r0}
runtime.SetFinalizer(wintun, freeAdapter)
return
}
// Delete deletes a Wintun adapter. This function succeeds if the adapter was not found. It returns
// a bool indicating whether a reboot is required.
func (wintun *Adapter) Delete(forceCloseSessions bool) (rebootRequired bool, err error) {
var _p0 uint32
if forceCloseSessions {
_p0 = 1
}
var _p1 uint32
r1, _, e1 := syscall.Syscall(procWintunDeleteAdapter.Addr(), 3, uintptr(wintun.handle), uintptr(_p0), uintptr(unsafe.Pointer(&_p1)))
rebootRequired = _p1 != 0
if r1 == 0 {
err = e1
}
return
}
// DeleteMatchingAdapters deletes all Wintun adapters, which match
// given criteria, and returns which ones it deleted, whether a reboot
// is required after, and which errors occurred during the process.
func (pool *Pool) DeleteMatchingAdapters(matches func(adapter *Adapter) bool, forceCloseSessions bool) (rebootRequired bool, errors []error) {
cb := func(handle uintptr, _ uintptr) int {
adapter := &Adapter{handle}
if !matches(adapter) {
return 1
}
rebootRequired2, err := adapter.Delete(forceCloseSessions)
if err != nil {
errors = append(errors, err)
return 1
}
rebootRequired = rebootRequired || rebootRequired2
return 1
}
r1, _, e1 := syscall.Syscall(procWintunEnumAdapters.Addr(), 3, uintptr(unsafe.Pointer(pool)), uintptr(windows.NewCallback(cb)), 0)
if r1 == 0 {
errors = append(errors, e1)
}
return
}
// Name returns the name of the Wintun adapter.
func (wintun *Adapter) Name() (ifname string, err error) {
var ifname16 [AdapterNameMax]uint16
r1, _, e1 := syscall.Syscall(procWintunGetAdapterName.Addr(), 2, uintptr(wintun.handle), uintptr(unsafe.Pointer(&ifname16[0])), 0)
if r1 == 0 {
err = e1
return
}
ifname = windows.UTF16ToString(ifname16[:])
return
}
// DeleteDriver deletes all Wintun adapters in a pool and if there are no more adapters in any other
// pools, also removes Wintun from the driver store, usually called by uninstallers.
func (pool *Pool) DeleteDriver() (rebootRequired bool, err error) {
var _p0 uint32
r1, _, e1 := syscall.Syscall(procWintunDeletePoolDriver.Addr(), 2, uintptr(unsafe.Pointer(pool)), uintptr(unsafe.Pointer(&_p0)), 0)
rebootRequired = _p0 != 0
if r1 == 0 {
err = e1
}
return
}
// SetName sets name of the Wintun adapter.
func (wintun *Adapter) SetName(ifname string) (err error) {
ifname16, err := windows.UTF16FromString(ifname)
if err != nil {
return err
}
r1, _, e1 := syscall.Syscall(procWintunSetAdapterName.Addr(), 2, uintptr(wintun.handle), uintptr(unsafe.Pointer(&ifname16[0])), 0)
if r1 == 0 {
err = e1
}
return
}
// RunningVersion returns the version of the running Wintun driver.
func RunningVersion() (version uint32, err error) {
r0, _, e1 := syscall.Syscall(procWintunGetRunningDriverVersion.Addr(), 0, 0, 0, 0)
version = uint32(r0)
if version == 0 {
err = e1
}
return
}
// LUID returns the LUID of the adapter.
func (wintun *Adapter) LUID() (luid uint64) {
syscall.Syscall(procWintunGetAdapterLUID.Addr(), 2, uintptr(wintun.handle), uintptr(unsafe.Pointer(&luid)), 0)
return
}
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