mirror of
https://github.com/DNSCrypt/dnscrypt-proxy.git
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438 lines
9.4 KiB
Go
438 lines
9.4 KiB
Go
// Copyright 2015 Daniel Theophanes.
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// Use of this source code is governed by a zlib-style
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// license that can be found in the LICENSE file.
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package service
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import (
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"fmt"
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"os"
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"os/signal"
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"strconv"
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"strings"
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"sync"
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"time"
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"golang.org/x/sys/windows/registry"
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"golang.org/x/sys/windows/svc"
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"golang.org/x/sys/windows/svc/eventlog"
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"golang.org/x/sys/windows/svc/mgr"
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)
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const version = "windows-service"
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type windowsService struct {
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i Interface
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*Config
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errSync sync.Mutex
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stopStartErr error
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}
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// WindowsLogger allows using windows specific logging methods.
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type WindowsLogger struct {
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ev *eventlog.Log
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errs chan<- error
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}
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type windowsSystem struct{}
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func (windowsSystem) String() string {
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return version
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}
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func (windowsSystem) Detect() bool {
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return true
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}
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func (windowsSystem) Interactive() bool {
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return interactive
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}
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func (windowsSystem) New(i Interface, c *Config) (Service, error) {
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ws := &windowsService{
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i: i,
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Config: c,
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}
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return ws, nil
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}
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func init() {
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ChooseSystem(windowsSystem{})
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}
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func (l WindowsLogger) send(err error) error {
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if err == nil {
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return nil
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}
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if l.errs != nil {
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l.errs <- err
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}
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return err
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}
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// Error logs an error message.
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func (l WindowsLogger) Error(v ...interface{}) error {
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return l.send(l.ev.Error(3, fmt.Sprint(v...)))
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}
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// Warning logs an warning message.
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func (l WindowsLogger) Warning(v ...interface{}) error {
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return l.send(l.ev.Warning(2, fmt.Sprint(v...)))
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}
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// Info logs an info message.
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func (l WindowsLogger) Info(v ...interface{}) error {
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return l.send(l.ev.Info(1, fmt.Sprint(v...)))
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}
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// Errorf logs an error message.
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func (l WindowsLogger) Errorf(format string, a ...interface{}) error {
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return l.send(l.ev.Error(3, fmt.Sprintf(format, a...)))
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}
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// Warningf logs an warning message.
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func (l WindowsLogger) Warningf(format string, a ...interface{}) error {
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return l.send(l.ev.Warning(2, fmt.Sprintf(format, a...)))
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}
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// Infof logs an info message.
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func (l WindowsLogger) Infof(format string, a ...interface{}) error {
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return l.send(l.ev.Info(1, fmt.Sprintf(format, a...)))
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}
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// NError logs an error message and an event ID.
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func (l WindowsLogger) NError(eventID uint32, v ...interface{}) error {
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return l.send(l.ev.Error(eventID, fmt.Sprint(v...)))
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}
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// NWarning logs an warning message and an event ID.
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func (l WindowsLogger) NWarning(eventID uint32, v ...interface{}) error {
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return l.send(l.ev.Warning(eventID, fmt.Sprint(v...)))
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}
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// NInfo logs an info message and an event ID.
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func (l WindowsLogger) NInfo(eventID uint32, v ...interface{}) error {
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return l.send(l.ev.Info(eventID, fmt.Sprint(v...)))
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}
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// NErrorf logs an error message and an event ID.
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func (l WindowsLogger) NErrorf(eventID uint32, format string, a ...interface{}) error {
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return l.send(l.ev.Error(eventID, fmt.Sprintf(format, a...)))
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}
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// NWarningf logs an warning message and an event ID.
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func (l WindowsLogger) NWarningf(eventID uint32, format string, a ...interface{}) error {
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return l.send(l.ev.Warning(eventID, fmt.Sprintf(format, a...)))
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}
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// NInfof logs an info message and an event ID.
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func (l WindowsLogger) NInfof(eventID uint32, format string, a ...interface{}) error {
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return l.send(l.ev.Info(eventID, fmt.Sprintf(format, a...)))
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}
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var interactive = false
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func init() {
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var err error
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interactive, err = svc.IsAnInteractiveSession()
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if err != nil {
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panic(err)
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}
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}
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func (ws *windowsService) String() string {
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if len(ws.DisplayName) > 0 {
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return ws.DisplayName
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}
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return ws.Name
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}
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func (ws *windowsService) Platform() string {
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return version
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}
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func (ws *windowsService) setError(err error) {
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ws.errSync.Lock()
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defer ws.errSync.Unlock()
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ws.stopStartErr = err
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}
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func (ws *windowsService) getError() error {
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ws.errSync.Lock()
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defer ws.errSync.Unlock()
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return ws.stopStartErr
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}
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func (ws *windowsService) Execute(args []string, r <-chan svc.ChangeRequest, changes chan<- svc.Status) (bool, uint32) {
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const cmdsAccepted = svc.AcceptStop | svc.AcceptShutdown
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changes <- svc.Status{State: svc.StartPending}
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if err := ws.i.Start(ws); err != nil {
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ws.setError(err)
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return true, 1
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}
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changes <- svc.Status{State: svc.Running, Accepts: cmdsAccepted}
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loop:
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for {
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c := <-r
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switch c.Cmd {
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case svc.Interrogate:
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changes <- c.CurrentStatus
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case svc.Stop, svc.Shutdown:
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changes <- svc.Status{State: svc.StopPending}
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if err := ws.i.Stop(ws); err != nil {
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ws.setError(err)
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return true, 2
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}
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break loop
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default:
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continue loop
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}
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}
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return false, 0
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}
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func (ws *windowsService) Install() error {
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exepath, err := ws.execPath()
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if err != nil {
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return err
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}
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m, err := mgr.Connect()
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if err != nil {
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return err
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}
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defer m.Disconnect()
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s, err := m.OpenService(ws.Name)
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if err == nil {
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s.Close()
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return fmt.Errorf("service %s already exists", ws.Name)
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}
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s, err = m.CreateService(ws.Name, exepath, mgr.Config{
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DisplayName: ws.DisplayName,
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Description: ws.Description,
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StartType: mgr.StartAutomatic,
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ServiceStartName: ws.UserName,
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Password: ws.Option.string("Password", ""),
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Dependencies: ws.Dependencies,
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}, ws.Arguments...)
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if err != nil {
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return err
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}
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defer s.Close()
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err = eventlog.InstallAsEventCreate(ws.Name, eventlog.Error|eventlog.Warning|eventlog.Info)
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if err != nil {
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if !strings.Contains(err.Error(), "exists") {
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s.Delete()
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return fmt.Errorf("SetupEventLogSource() failed: %s", err)
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}
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}
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return nil
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}
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func (ws *windowsService) Uninstall() error {
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m, err := mgr.Connect()
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if err != nil {
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return err
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}
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defer m.Disconnect()
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s, err := m.OpenService(ws.Name)
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if err != nil {
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return fmt.Errorf("service %s is not installed", ws.Name)
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}
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defer s.Close()
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err = s.Delete()
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if err != nil {
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return err
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}
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err = eventlog.Remove(ws.Name)
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if err != nil {
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return fmt.Errorf("RemoveEventLogSource() failed: %s", err)
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}
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return nil
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}
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func (ws *windowsService) Run() error {
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ws.setError(nil)
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if !interactive {
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// Return error messages from start and stop routines
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// that get executed in the Execute method.
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// Guarded with a mutex as it may run a different thread
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// (callback from windows).
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runErr := svc.Run(ws.Name, ws)
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startStopErr := ws.getError()
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if startStopErr != nil {
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return startStopErr
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}
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if runErr != nil {
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return runErr
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}
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return nil
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}
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err := ws.i.Start(ws)
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if err != nil {
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return err
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}
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sigChan := make(chan os.Signal)
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signal.Notify(sigChan, os.Interrupt)
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<-sigChan
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return ws.i.Stop(ws)
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}
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func (ws *windowsService) Status() (Status, error) {
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m, err := mgr.Connect()
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if err != nil {
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return StatusUnknown, err
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}
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defer m.Disconnect()
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s, err := m.OpenService(ws.Name)
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if err != nil {
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if err.Error() == "The specified service does not exist as an installed service." {
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return StatusUnknown, ErrNotInstalled
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}
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return StatusUnknown, err
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}
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defer s.Close()
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status, err := s.Query()
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if err != nil {
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return StatusUnknown, err
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}
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switch status.State {
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case svc.StartPending:
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fallthrough
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case svc.Running:
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return StatusRunning, nil
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case svc.PausePending:
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fallthrough
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case svc.Paused:
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fallthrough
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case svc.ContinuePending:
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fallthrough
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case svc.StopPending:
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fallthrough
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case svc.Stopped:
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return StatusStopped, nil
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default:
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return StatusUnknown, fmt.Errorf("unknown status %v", status)
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}
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}
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func (ws *windowsService) Start() error {
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m, err := mgr.Connect()
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if err != nil {
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return err
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}
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defer m.Disconnect()
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s, err := m.OpenService(ws.Name)
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if err != nil {
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return err
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}
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defer s.Close()
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return s.Start()
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}
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func (ws *windowsService) Stop() error {
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m, err := mgr.Connect()
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if err != nil {
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return err
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}
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defer m.Disconnect()
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s, err := m.OpenService(ws.Name)
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if err != nil {
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return err
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}
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defer s.Close()
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return ws.stopWait(s)
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}
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func (ws *windowsService) Restart() error {
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m, err := mgr.Connect()
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if err != nil {
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return err
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}
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defer m.Disconnect()
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s, err := m.OpenService(ws.Name)
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if err != nil {
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return err
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}
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defer s.Close()
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err = ws.stopWait(s)
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if err != nil {
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return err
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}
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return s.Start()
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}
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func (ws *windowsService) stopWait(s *mgr.Service) error {
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// First stop the service. Then wait for the service to
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// actually stop before starting it.
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status, err := s.Control(svc.Stop)
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if err != nil {
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return err
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}
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timeDuration := time.Millisecond * 50
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timeout := time.After(getStopTimeout() + (timeDuration * 2))
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tick := time.NewTicker(timeDuration)
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defer tick.Stop()
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for status.State != svc.Stopped {
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select {
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case <-tick.C:
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status, err = s.Query()
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if err != nil {
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return err
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}
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case <-timeout:
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break
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}
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}
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return nil
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}
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// getStopTimeout fetches the time before windows will kill the service.
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func getStopTimeout() time.Duration {
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// For default and paths see https://support.microsoft.com/en-us/kb/146092
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defaultTimeout := time.Millisecond * 20000
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key, err := registry.OpenKey(registry.LOCAL_MACHINE, `SYSTEM\CurrentControlSet\Control`, registry.READ)
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if err != nil {
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return defaultTimeout
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}
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sv, _, err := key.GetStringValue("WaitToKillServiceTimeout")
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if err != nil {
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return defaultTimeout
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}
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v, err := strconv.Atoi(sv)
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if err != nil {
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return defaultTimeout
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}
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return time.Millisecond * time.Duration(v)
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}
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func (ws *windowsService) Logger(errs chan<- error) (Logger, error) {
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if interactive {
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return ConsoleLogger, nil
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}
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return ws.SystemLogger(errs)
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}
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func (ws *windowsService) SystemLogger(errs chan<- error) (Logger, error) {
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el, err := eventlog.Open(ws.Name)
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if err != nil {
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return nil, err
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}
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return WindowsLogger{el, errs}, nil
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}
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