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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
*/
package driver
import (
"errors"
"log"
"runtime"
"syscall"
"unsafe"
"golang.org/x/sys/windows"
"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
)
type loggerLevel int
const (
logInfo loggerLevel = iota
logWarn
logErr
)
const (
PoolNameMax = 256
AdapterNameMax = 128
)
type Pool [PoolNameMax]uint16
type Adapter struct {
handle uintptr
lastGetGuessSize uint32
}
var (
modwireguard = newLazyDLL("wireguard.dll", setupLogger)
procWireGuardCreateAdapter = modwireguard.NewProc("WireGuardCreateAdapter")
procWireGuardDeleteAdapter = modwireguard.NewProc("WireGuardDeleteAdapter")
procWireGuardDeletePoolDriver = modwireguard.NewProc("WireGuardDeletePoolDriver")
procWireGuardEnumAdapters = modwireguard.NewProc("WireGuardEnumAdapters")
procWireGuardFreeAdapter = modwireguard.NewProc("WireGuardFreeAdapter")
procWireGuardOpenAdapter = modwireguard.NewProc("WireGuardOpenAdapter")
procWireGuardGetAdapterLUID = modwireguard.NewProc("WireGuardGetAdapterLUID")
procWireGuardGetAdapterName = modwireguard.NewProc("WireGuardGetAdapterName")
procWireGuardGetRunningDriverVersion = modwireguard.NewProc("WireGuardGetRunningDriverVersion")
procWireGuardSetAdapterName = modwireguard.NewProc("WireGuardSetAdapterName")
procWireGuardSetAdapterLogging = modwireguard.NewProc("WireGuardSetAdapterLogging")
)
func setupLogger(dll *lazyDLL) {
syscall.Syscall(dll.NewProc("WireGuardSetLogger").Addr(), 1, windows.NewCallback(func(level loggerLevel, msg *uint16) int {
log.Println(windows.UTF16PtrToString(msg))
return 0
}), 0, 0)
}
var DefaultPool, _ = MakePool("WireGuard")
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(wireguard *Adapter) {
syscall.Syscall(procWireGuardFreeAdapter.Addr(), 1, wireguard.handle, 0, 0)
}
// OpenAdapter finds a WireGuard 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 WireGuard-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) (wireguard *Adapter, err error) {
ifname16, err := windows.UTF16PtrFromString(ifname)
if err != nil {
return nil, err
}
r0, _, e1 := syscall.Syscall(procWireGuardOpenAdapter.Addr(), 2, uintptr(unsafe.Pointer(pool)), uintptr(unsafe.Pointer(ifname16)), 0)
if r0 == 0 {
err = e1
return
}
wireguard = &Adapter{handle: r0}
runtime.SetFinalizer(wireguard, freeAdapter)
return
}
// CreateAdapter creates a WireGuard 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) (wireguard *Adapter, rebootRequired bool, err error) {
var ifname16 *uint16
ifname16, err = windows.UTF16PtrFromString(ifname)
if err != nil {
return
}
var _p0 uint32
r0, _, e1 := syscall.Syscall6(procWireGuardCreateAdapter.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
}
wireguard = &Adapter{handle: r0}
runtime.SetFinalizer(wireguard, freeAdapter)
return
}
// Delete deletes a WireGuard adapter. This function succeeds if the adapter was not found. It returns
// a bool indicating whether a reboot is required.
func (wireguard *Adapter) Delete() (rebootRequired bool, err error) {
var _p0 uint32
r1, _, e1 := syscall.Syscall(procWireGuardDeleteAdapter.Addr(), 2, wireguard.handle, uintptr(unsafe.Pointer(&_p0)), 0)
rebootRequired = _p0 != 0
if r1 == 0 {
err = e1
}
return
}
// DeleteMatchingAdapters deletes all WireGuard 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) (rebootRequired bool, errors []error) {
cb := func(handle uintptr, _ uintptr) int {
adapter := &Adapter{handle: handle}
if !matches(adapter) {
return 1
}
rebootRequired2, err := adapter.Delete()
if err != nil {
errors = append(errors, err)
return 1
}
rebootRequired = rebootRequired || rebootRequired2
return 1
}
r1, _, e1 := syscall.Syscall(procWireGuardEnumAdapters.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 WireGuard adapter.
func (wireguard *Adapter) Name() (ifname string, err error) {
var ifname16 [AdapterNameMax]uint16
r1, _, e1 := syscall.Syscall(procWireGuardGetAdapterName.Addr(), 2, wireguard.handle, uintptr(unsafe.Pointer(&ifname16[0])), 0)
if r1 == 0 {
err = e1
return
}
ifname = windows.UTF16ToString(ifname16[:])
return
}
// DeleteDriver deletes all WireGuard adapters in a pool and if there are no more adapters in any other
// pools, also removes WireGuard from the driver store, usually called by uninstallers.
func (pool *Pool) DeleteDriver() (rebootRequired bool, err error) {
var _p0 uint32
r1, _, e1 := syscall.Syscall(procWireGuardDeletePoolDriver.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 WireGuard adapter.
func (wireguard *Adapter) SetName(ifname string) (err error) {
ifname16, err := windows.UTF16FromString(ifname)
if err != nil {
return err
}
r1, _, e1 := syscall.Syscall(procWireGuardSetAdapterName.Addr(), 2, wireguard.handle, uintptr(unsafe.Pointer(&ifname16[0])), 0)
if r1 == 0 {
err = e1
}
return
}
type AdapterLogState uint32
const (
AdapterLogOff AdapterLogState = 0
AdapterLogOn AdapterLogState = 1
AdapterLogOnWithPrefix AdapterLogState = 2
)
// SetLogging enables or disables logging on the WireGuard adapter.
func (wireguard *Adapter) SetLogging(logState AdapterLogState) (err error) {
r1, _, e1 := syscall.Syscall(procWireGuardSetAdapterLogging.Addr(), 2, wireguard.handle, uintptr(logState), 0)
if r1 == 0 {
err = e1
}
return
}
// RunningVersion returns the version of the running WireGuard driver.
func RunningVersion() (version uint32, err error) {
r0, _, e1 := syscall.Syscall(procWireGuardGetRunningDriverVersion.Addr(), 0, 0, 0, 0)
version = uint32(r0)
if version == 0 {
err = e1
}
return
}
// LUID returns the LUID of the adapter.
func (wireguard *Adapter) LUID() (luid winipcfg.LUID) {
syscall.Syscall(procWireGuardGetAdapterLUID.Addr(), 2, wireguard.handle, uintptr(unsafe.Pointer(&luid)), 0)
return
}
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