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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"
"unicode/utf16"
"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
}
func toString(p *uint16) string {
if p == nil {
return ""
}
return syscall.UTF16ToString((*[4096]uint16)(unsafe.Pointer(p))[:])
}
func toStringSlice(ps *uint16) []string {
if ps == nil {
return nil
}
r := make([]string, 0)
for from, i, p := 0, 0, (*[1 << 24]uint16)(unsafe.Pointer(ps)); true; i++ {
if p[i] == 0 {
// empty string marks the end
if i <= from {
break
}
r = append(r, string(utf16.Decode(p[from:i])))
from = i + 1
}
}
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
}
}
var p2 *windows.SERVICE_DESCRIPTION
n = uint32(1024)
for {
b := make([]byte, n)
p2 = (*windows.SERVICE_DESCRIPTION)(unsafe.Pointer(&b[0]))
err := windows.QueryServiceConfig2(s.Handle,
windows.SERVICE_CONFIG_DESCRIPTION, &b[0], 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
}
}
return Config{
ServiceType: p.ServiceType,
StartType: p.StartType,
ErrorControl: p.ErrorControl,
BinaryPathName: toString(p.BinaryPathName),
LoadOrderGroup: toString(p.LoadOrderGroup),
TagId: p.TagId,
Dependencies: toStringSlice(p.Dependencies),
ServiceStartName: toString(p.ServiceStartName),
DisplayName: toString(p.DisplayName),
Description: toString(p2.Description),
}, nil
}
func updateDescription(handle windows.Handle, desc string) error {
d := windows.SERVICE_DESCRIPTION{toPtr(desc)}
return windows.ChangeServiceConfig2(handle,
windows.SERVICE_CONFIG_DESCRIPTION, (*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
}
return updateDescription(s.Handle, c.Description)
}
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