140 lines
3.8 KiB
Go
140 lines
3.8 KiB
Go
// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build windows
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package mgr
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import (
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"syscall"
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"unicode/utf16"
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"unsafe"
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"golang.org/x/sys/windows"
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)
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const (
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// Service start types.
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StartManual = windows.SERVICE_DEMAND_START // the service must be started manually
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StartAutomatic = windows.SERVICE_AUTO_START // the service will start by itself whenever the computer reboots
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StartDisabled = windows.SERVICE_DISABLED // the service cannot be started
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// The severity of the error, and action taken,
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// if this service fails to start.
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ErrorCritical = windows.SERVICE_ERROR_CRITICAL
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ErrorIgnore = windows.SERVICE_ERROR_IGNORE
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ErrorNormal = windows.SERVICE_ERROR_NORMAL
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ErrorSevere = windows.SERVICE_ERROR_SEVERE
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)
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// TODO(brainman): Password is not returned by windows.QueryServiceConfig, not sure how to get it.
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type Config struct {
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ServiceType uint32
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StartType uint32
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ErrorControl uint32
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BinaryPathName string // fully qualified path to the service binary file, can also include arguments for an auto-start service
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LoadOrderGroup string
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TagId uint32
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Dependencies []string
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ServiceStartName string // name of the account under which the service should run
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DisplayName string
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Password string
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Description string
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}
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func toString(p *uint16) string {
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if p == nil {
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return ""
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}
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return syscall.UTF16ToString((*[4096]uint16)(unsafe.Pointer(p))[:])
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}
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func toStringSlice(ps *uint16) []string {
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if ps == nil {
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return nil
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}
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r := make([]string, 0)
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for from, i, p := 0, 0, (*[1 << 24]uint16)(unsafe.Pointer(ps)); true; i++ {
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if p[i] == 0 {
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// empty string marks the end
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if i <= from {
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break
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}
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r = append(r, string(utf16.Decode(p[from:i])))
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from = i + 1
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}
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}
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return r
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}
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// Config retrieves service s configuration paramteres.
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func (s *Service) Config() (Config, error) {
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var p *windows.QUERY_SERVICE_CONFIG
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n := uint32(1024)
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for {
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b := make([]byte, n)
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p = (*windows.QUERY_SERVICE_CONFIG)(unsafe.Pointer(&b[0]))
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err := windows.QueryServiceConfig(s.Handle, p, n, &n)
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if err == nil {
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break
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}
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if err.(syscall.Errno) != syscall.ERROR_INSUFFICIENT_BUFFER {
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return Config{}, err
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}
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if n <= uint32(len(b)) {
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return Config{}, err
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}
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}
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var p2 *windows.SERVICE_DESCRIPTION
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n = uint32(1024)
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for {
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b := make([]byte, n)
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p2 = (*windows.SERVICE_DESCRIPTION)(unsafe.Pointer(&b[0]))
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err := windows.QueryServiceConfig2(s.Handle,
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windows.SERVICE_CONFIG_DESCRIPTION, &b[0], n, &n)
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if err == nil {
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break
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}
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if err.(syscall.Errno) != syscall.ERROR_INSUFFICIENT_BUFFER {
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return Config{}, err
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}
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if n <= uint32(len(b)) {
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return Config{}, err
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}
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}
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return Config{
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ServiceType: p.ServiceType,
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StartType: p.StartType,
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ErrorControl: p.ErrorControl,
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BinaryPathName: toString(p.BinaryPathName),
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LoadOrderGroup: toString(p.LoadOrderGroup),
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TagId: p.TagId,
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Dependencies: toStringSlice(p.Dependencies),
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ServiceStartName: toString(p.ServiceStartName),
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DisplayName: toString(p.DisplayName),
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Description: toString(p2.Description),
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}, nil
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}
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func updateDescription(handle windows.Handle, desc string) error {
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d := windows.SERVICE_DESCRIPTION{toPtr(desc)}
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return windows.ChangeServiceConfig2(handle,
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windows.SERVICE_CONFIG_DESCRIPTION, (*byte)(unsafe.Pointer(&d)))
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}
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// UpdateConfig updates service s configuration parameters.
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func (s *Service) UpdateConfig(c Config) error {
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err := windows.ChangeServiceConfig(s.Handle, c.ServiceType, c.StartType,
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c.ErrorControl, toPtr(c.BinaryPathName), toPtr(c.LoadOrderGroup),
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nil, toStringBlock(c.Dependencies), toPtr(c.ServiceStartName),
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toPtr(c.Password), toPtr(c.DisplayName))
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if err != nil {
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return err
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}
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return updateDescription(s.Handle, c.Description)
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}
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