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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
*/
package service
import (
"fmt"
"log"
"runtime"
"sync"
"syscall"
"time"
"golang.org/x/sys/windows"
"golang.org/x/sys/windows/svc"
"golang.org/x/sys/windows/svc/mgr"
"golang.zx2c4.com/wireguard/windows/conf"
)
//sys notifyServiceStatusChange(service windows.Handle, notifyMask uint32, notifier *SERVICE_NOTIFY) (ret error) = advapi32.NotifyServiceStatusChangeW
//sys sleepEx(milliseconds uint32, alertable bool) (ret uint32) = kernel32.SleepEx
const (
SERVICE_NOTIFY_STATUS_CHANGE = 2
SERVICE_NOTIFY_STOPPED = 0x00000001
SERVICE_NOTIFY_START_PENDING = 0x00000002
SERVICE_NOTIFY_STOP_PENDING = 0x00000004
SERVICE_NOTIFY_RUNNING = 0x00000008
SERVICE_NOTIFY_CONTINUE_PENDING = 0x00000010
SERVICE_NOTIFY_PAUSE_PENDING = 0x00000020
SERVICE_NOTIFY_PAUSED = 0x00000040
SERVICE_NOTIFY_CREATED = 0x00000080
SERVICE_NOTIFY_DELETED = 0x00000100
SERVICE_NOTIFY_DELETE_PENDING = 0x00000200
STATUS_USER_APC = 0x000000C0
WAIT_IO_COMPLETION = STATUS_USER_APC
)
type SERVICE_NOTIFY struct {
Version uint32
NotifyCallback uintptr
Context uintptr
NotificationStatus uint32
ServiceStatus windows.SERVICE_STATUS_PROCESS
NotificationTriggered uint32
ServiceNames *uint16
}
func trackExistingTunnels() error {
m, err := serviceManager()
if err != nil {
return err
}
names, err := conf.ListConfigNames()
if err != nil {
return err
}
for _, name := range names {
serviceName, err := ServiceNameOfTunnel(name)
if err != nil {
continue
}
service, err := m.OpenService(serviceName)
if err != nil {
continue
}
go trackTunnelService(name, service)
}
return nil
}
var serviceTrackerCallbackPtr = windows.NewCallback(func(notifier *SERVICE_NOTIFY) uintptr {
return 0
})
var trackedTunnels = make(map[string]TunnelState)
var trackedTunnelsLock = sync.Mutex{}
func svcStateToTunState(s svc.State) TunnelState {
switch s {
case svc.StartPending:
return TunnelStarting
case svc.Running:
return TunnelStarted
case svc.StopPending:
return TunnelStopping
case svc.Stopped:
return TunnelStopped
default:
return TunnelUnknown
}
}
func trackedTunnelsGlobalState() (state TunnelState) {
state = TunnelStopped
trackedTunnelsLock.Lock()
defer trackedTunnelsLock.Unlock()
for _, s := range trackedTunnels {
if s == TunnelStarting {
return TunnelStarting
} else if s == TunnelStopping {
return TunnelStopping
} else if s == TunnelStarted || s == TunnelUnknown {
state = TunnelStarted
}
}
return
}
func trackTunnelService(tunnelName string, service *mgr.Service) {
defer func() {
service.Close()
log.Printf("[%s] Tunnel service tracker finished", tunnelName)
}()
trackedTunnelsLock.Lock()
if _, found := trackedTunnels[tunnelName]; found {
trackedTunnelsLock.Unlock()
return
}
trackedTunnels[tunnelName] = TunnelUnknown
trackedTunnelsLock.Unlock()
defer func() {
trackedTunnelsLock.Lock()
delete(trackedTunnels, tunnelName)
trackedTunnelsLock.Unlock()
}()
const serviceNotifications = SERVICE_NOTIFY_RUNNING | SERVICE_NOTIFY_START_PENDING | SERVICE_NOTIFY_STOP_PENDING | SERVICE_NOTIFY_STOPPED | SERVICE_NOTIFY_DELETE_PENDING
notifier := &SERVICE_NOTIFY{
Version: SERVICE_NOTIFY_STATUS_CHANGE,
NotifyCallback: serviceTrackerCallbackPtr,
}
checkForDisabled := func() (shouldReturn bool) {
config, err := service.Config()
if err == syscall.Errno(serviceMARKED_FOR_DELETE) || config.StartType == windows.SERVICE_DISABLED {
log.Printf("[%s] Found disabled service via timeout, so deleting", tunnelName)
service.Delete()
trackedTunnelsLock.Lock()
trackedTunnels[tunnelName] = TunnelStopped
trackedTunnelsLock.Unlock()
IPCServerNotifyTunnelChange(tunnelName, TunnelStopped, nil)
return true
}
return false
}
if checkForDisabled() {
return
}
runtime.LockOSThread()
defer runtime.UnlockOSThread()
lastState := TunnelUnknown
for {
err := notifyServiceStatusChange(service.Handle, serviceNotifications, notifier)
switch err {
case nil:
for {
if sleepEx(uint32(time.Second*3/time.Millisecond), true) == WAIT_IO_COMPLETION {
break
} else if checkForDisabled() {
return
}
}
case windows.ERROR_SERVICE_MARKED_FOR_DELETE:
trackedTunnelsLock.Lock()
trackedTunnels[tunnelName] = TunnelStopped
trackedTunnelsLock.Unlock()
IPCServerNotifyTunnelChange(tunnelName, TunnelStopped, nil)
return
case windows.ERROR_SERVICE_NOTIFY_CLIENT_LAGGING:
continue
default:
trackedTunnelsLock.Lock()
trackedTunnels[tunnelName] = TunnelStopped
trackedTunnelsLock.Unlock()
IPCServerNotifyTunnelChange(tunnelName, TunnelStopped, fmt.Errorf("Unable to continue monitoring service, so stopping: %v", err))
service.Control(svc.Stop)
return
}
state := svcStateToTunState(svc.State(notifier.ServiceStatus.CurrentState))
var tunnelError error
if state == TunnelStopped {
if notifier.ServiceStatus.Win32ExitCode == uint32(windows.ERROR_SERVICE_SPECIFIC_ERROR) {
maybeErr := Error(notifier.ServiceStatus.ServiceSpecificExitCode)
if maybeErr != ErrorSuccess {
tunnelError = maybeErr
}
} else {
switch notifier.ServiceStatus.Win32ExitCode {
case uint32(windows.NO_ERROR), serviceNEVER_STARTED:
default:
tunnelError = syscall.Errno(notifier.ServiceStatus.Win32ExitCode)
}
}
}
if state != lastState {
trackedTunnelsLock.Lock()
trackedTunnels[tunnelName] = state
trackedTunnelsLock.Unlock()
IPCServerNotifyTunnelChange(tunnelName, state, tunnelError)
lastState = state
}
}
}
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