147 lines
4.3 KiB
Go
147 lines
4.3 KiB
Go
/* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
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*/
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package wintun
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import (
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"log"
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"runtime"
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"syscall"
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"unsafe"
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"golang.org/x/sys/windows"
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)
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type loggerLevel int
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const (
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logInfo loggerLevel = iota
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logWarn
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logErr
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)
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const AdapterNameMax = 128
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type Adapter struct {
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handle uintptr
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}
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var (
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modwintun = newLazyDLL("wintun.dll", setupLogger)
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procWintunCreateAdapter = modwintun.NewProc("WintunCreateAdapter")
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procWintunOpenAdapter = modwintun.NewProc("WintunOpenAdapter")
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procWintunCloseAdapter = modwintun.NewProc("WintunCloseAdapter")
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procWintunDeleteDriver = modwintun.NewProc("WintunDeleteDriver")
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procWintunGetAdapterLUID = modwintun.NewProc("WintunGetAdapterLUID")
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procWintunGetRunningDriverVersion = modwintun.NewProc("WintunGetRunningDriverVersion")
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)
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type TimestampedWriter interface {
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WriteWithTimestamp(p []byte, ts int64) (n int, err error)
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}
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func logMessage(level loggerLevel, timestamp uint64, msg *uint16) int {
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if tw, ok := log.Default().Writer().(TimestampedWriter); ok {
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tw.WriteWithTimestamp([]byte(log.Default().Prefix()+windows.UTF16PtrToString(msg)), (int64(timestamp)-116444736000000000)*100)
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} else {
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log.Println(windows.UTF16PtrToString(msg))
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}
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return 0
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}
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func setupLogger(dll *lazyDLL) {
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var callback uintptr
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if runtime.GOARCH == "386" || runtime.GOARCH == "arm" {
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callback = windows.NewCallback(func(level loggerLevel, timestampLow, timestampHigh uint32, msg *uint16) int {
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return logMessage(level, uint64(timestampHigh)<<32|uint64(timestampLow), msg)
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})
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} else if runtime.GOARCH == "amd64" || runtime.GOARCH == "arm64" {
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callback = windows.NewCallback(logMessage)
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}
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syscall.Syscall(dll.NewProc("WintunSetLogger").Addr(), 1, callback, 0, 0)
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}
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func closeAdapter(wintun *Adapter) {
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syscall.Syscall(procWintunCloseAdapter.Addr(), 1, wintun.handle, 0, 0)
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}
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// CreateAdapter creates a Wintun adapter. name is the cosmetic name of the adapter.
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// tunnelType represents the type of adapter and should be "Wintun". requestedGUID is
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// the GUID of the created network adapter, which then influences NLA generation
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// deterministically. If it is set to nil, the GUID is chosen by the system at random,
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// and hence a new NLA entry is created for each new adapter.
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func CreateAdapter(name string, tunnelType string, requestedGUID *windows.GUID) (wintun *Adapter, err error) {
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var name16 *uint16
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name16, err = windows.UTF16PtrFromString(name)
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if err != nil {
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return
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}
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var tunnelType16 *uint16
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tunnelType16, err = windows.UTF16PtrFromString(tunnelType)
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if err != nil {
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return
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}
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r0, _, e1 := syscall.Syscall(procWintunCreateAdapter.Addr(), 3, uintptr(unsafe.Pointer(name16)), uintptr(unsafe.Pointer(tunnelType16)), uintptr(unsafe.Pointer(requestedGUID)))
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if r0 == 0 {
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err = e1
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return
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}
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wintun = &Adapter{handle: r0}
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runtime.SetFinalizer(wintun, closeAdapter)
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return
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}
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// OpenAdapter opens an existing Wintun adapter by name.
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func OpenAdapter(name string) (wintun *Adapter, err error) {
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var name16 *uint16
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name16, err = windows.UTF16PtrFromString(name)
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if err != nil {
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return
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}
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r0, _, e1 := syscall.Syscall(procWintunOpenAdapter.Addr(), 1, uintptr(unsafe.Pointer(name16)), 0, 0)
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if r0 == 0 {
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err = e1
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return
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}
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wintun = &Adapter{handle: r0}
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runtime.SetFinalizer(wintun, closeAdapter)
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return
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}
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// Close closes a Wintun adapter.
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func (wintun *Adapter) Close() (err error) {
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runtime.SetFinalizer(wintun, nil)
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r1, _, e1 := syscall.Syscall(procWintunCloseAdapter.Addr(), 1, wintun.handle, 0, 0)
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if r1 == 0 {
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err = e1
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}
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return
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}
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// Uninstall removes the driver from the system if no drivers are currently in use.
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func Uninstall() (err error) {
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r1, _, e1 := syscall.Syscall(procWintunDeleteDriver.Addr(), 0, 0, 0, 0)
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if r1 == 0 {
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err = e1
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}
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return
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}
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// RunningVersion returns the version of the running Wintun driver.
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func RunningVersion() (version uint32, err error) {
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r0, _, e1 := syscall.Syscall(procWintunGetRunningDriverVersion.Addr(), 0, 0, 0, 0)
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version = uint32(r0)
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if version == 0 {
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err = e1
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}
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return
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}
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// LUID returns the LUID of the adapter.
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func (wintun *Adapter) LUID() (luid uint64) {
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syscall.Syscall(procWintunGetAdapterLUID.Addr(), 2, uintptr(wintun.handle), uintptr(unsafe.Pointer(&luid)), 0)
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return
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}
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