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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build windows
package mgr
import (
"syscall"
"unsafe"
"golang.org/x/sys/windows"
)
const (
// Service start types.
StartManual = windows.SERVICE_DEMAND_START // the service must be started manually
StartAutomatic = windows.SERVICE_AUTO_START // the service will start by itself whenever the computer reboots
StartDisabled = windows.SERVICE_DISABLED // the service cannot be started
// The severity of the error, and action taken,
// if this service fails to start.
ErrorCritical = windows.SERVICE_ERROR_CRITICAL
ErrorIgnore = windows.SERVICE_ERROR_IGNORE
ErrorNormal = windows.SERVICE_ERROR_NORMAL
ErrorSevere = windows.SERVICE_ERROR_SEVERE
)
// TODO(brainman): Password is not returned by windows.QueryServiceConfig, not sure how to get it.
type Config struct {
ServiceType uint32
StartType uint32
ErrorControl uint32
BinaryPathName string // fully qualified path to the service binary file, can also include arguments for an auto-start service
LoadOrderGroup string
TagId uint32
Dependencies []string
ServiceStartName string // name of the account under which the service should run
DisplayName string
Password string
Description string
SidType uint32 // one of SERVICE_SID_TYPE, the type of sid to use for the service
DelayedAutoStart bool // the service is started after other auto-start services are started plus a short delay
}
func toStringSlice(ps *uint16) []string {
r := make([]string, 0)
p := unsafe.Pointer(ps)
for {
s := windows.UTF16PtrToString((*uint16)(p))
if len(s) == 0 {
break
}
r = append(r, s)
offset := unsafe.Sizeof(uint16(0)) * (uintptr)(len(s)+1)
p = unsafe.Pointer(uintptr(p) + offset)
}
return r
}
// Config retrieves service s configuration paramteres.
func (s *Service) Config() (Config, error) {
var p *windows.QUERY_SERVICE_CONFIG
n := uint32(1024)
for {
b := make([]byte, n)
p = (*windows.QUERY_SERVICE_CONFIG)(unsafe.Pointer(&b[0]))
err := windows.QueryServiceConfig(s.Handle, p, n, &n)
if err == nil {
break
}
if err.(syscall.Errno) != syscall.ERROR_INSUFFICIENT_BUFFER {
return Config{}, err
}
if n <= uint32(len(b)) {
return Config{}, err
}
}
b, err := s.queryServiceConfig2(windows.SERVICE_CONFIG_DESCRIPTION)
if err != nil {
return Config{}, err
}
p2 := (*windows.SERVICE_DESCRIPTION)(unsafe.Pointer(&b[0]))
b, err = s.queryServiceConfig2(windows.SERVICE_CONFIG_DELAYED_AUTO_START_INFO)
if err != nil {
return Config{}, err
}
p3 := (*windows.SERVICE_DELAYED_AUTO_START_INFO)(unsafe.Pointer(&b[0]))
delayedStart := false
if p3.IsDelayedAutoStartUp != 0 {
delayedStart = true
}
b, err = s.queryServiceConfig2(windows.SERVICE_CONFIG_SERVICE_SID_INFO)
if err != nil {
return Config{}, err
}
sidType := *(*uint32)(unsafe.Pointer(&b[0]))
return Config{
ServiceType: p.ServiceType,
StartType: p.StartType,
ErrorControl: p.ErrorControl,
BinaryPathName: windows.UTF16PtrToString(p.BinaryPathName),
LoadOrderGroup: windows.UTF16PtrToString(p.LoadOrderGroup),
TagId: p.TagId,
Dependencies: toStringSlice(p.Dependencies),
ServiceStartName: windows.UTF16PtrToString(p.ServiceStartName),
DisplayName: windows.UTF16PtrToString(p.DisplayName),
Description: windows.UTF16PtrToString(p2.Description),
DelayedAutoStart: delayedStart,
SidType: sidType,
}, nil
}
func updateDescription(handle windows.Handle, desc string) error {
d := windows.SERVICE_DESCRIPTION{Description: toPtr(desc)}
return windows.ChangeServiceConfig2(handle,
windows.SERVICE_CONFIG_DESCRIPTION, (*byte)(unsafe.Pointer(&d)))
}
func updateSidType(handle windows.Handle, sidType uint32) error {
return windows.ChangeServiceConfig2(handle, windows.SERVICE_CONFIG_SERVICE_SID_INFO, (*byte)(unsafe.Pointer(&sidType)))
}
func updateStartUp(handle windows.Handle, isDelayed bool) error {
var d windows.SERVICE_DELAYED_AUTO_START_INFO
if isDelayed {
d.IsDelayedAutoStartUp = 1
}
return windows.ChangeServiceConfig2(handle,
windows.SERVICE_CONFIG_DELAYED_AUTO_START_INFO, (*byte)(unsafe.Pointer(&d)))
}
// UpdateConfig updates service s configuration parameters.
func (s *Service) UpdateConfig(c Config) error {
err := windows.ChangeServiceConfig(s.Handle, c.ServiceType, c.StartType,
c.ErrorControl, toPtr(c.BinaryPathName), toPtr(c.LoadOrderGroup),
nil, toStringBlock(c.Dependencies), toPtr(c.ServiceStartName),
toPtr(c.Password), toPtr(c.DisplayName))
if err != nil {
return err
}
err = updateSidType(s.Handle, c.SidType)
if err != nil {
return err
}
err = updateStartUp(s.Handle, c.DelayedAutoStart)
if err != nil {
return err
}
return updateDescription(s.Handle, c.Description)
}
// queryServiceConfig2 calls Windows QueryServiceConfig2 with infoLevel parameter and returns retrieved service configuration information.
func (s *Service) queryServiceConfig2(infoLevel uint32) ([]byte, error) {
n := uint32(1024)
for {
b := make([]byte, n)
err := windows.QueryServiceConfig2(s.Handle, infoLevel, &b[0], n, &n)
if err == nil {
return b, nil
}
if err.(syscall.Errno) != syscall.ERROR_INSUFFICIENT_BUFFER {
return nil, err
}
if n <= uint32(len(b)) {
return nil, err
}
}
}
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